diff options
3 files changed, 0 insertions, 6303 deletions
diff --git a/target/linux/generic-2.6/patches-2.6.21/100-netfilter_layer7_2.17.patch b/target/linux/generic-2.6/patches-2.6.21/100-netfilter_layer7_2.17.patch deleted file mode 100644 index 8a9854ae9..000000000 --- a/target/linux/generic-2.6/patches-2.6.21/100-netfilter_layer7_2.17.patch +++ /dev/null @@ -1,2101 +0,0 @@ ---- a/net/netfilter/Kconfig -+++ b/net/netfilter/Kconfig -@@ -640,6 +640,27 @@ config NETFILTER_XT_MATCH_STATE - - To compile it as a module, choose M here. If unsure, say N. - -+config NETFILTER_XT_MATCH_LAYER7 -+ tristate '"layer7" match support' -+ depends on NETFILTER_XTABLES -+ depends on EXPERIMENTAL && (IP_NF_CONNTRACK || NF_CONNTRACK) -+ depends on NF_CT_ACCT -+ help -+ Say Y if you want to be able to classify connections (and their -+ packets) based on regular expression matching of their application -+ layer data. This is one way to classify applications such as -+ peer-to-peer filesharing systems that do not always use the same -+ port. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ -+config NETFILTER_XT_MATCH_LAYER7_DEBUG -+ bool 'Layer 7 debugging output' -+ depends on NETFILTER_XT_MATCH_LAYER7 -+ help -+ Say Y to get lots of debugging output. -+ -+ - config NETFILTER_XT_MATCH_STATISTIC - tristate '"statistic" match support' - depends on NETFILTER_XTABLES ---- a/net/netfilter/Makefile -+++ b/net/netfilter/Makefile -@@ -68,6 +68,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_QUOTA) + - obj-$(CONFIG_NETFILTER_XT_MATCH_REALM) += xt_realm.o - obj-$(CONFIG_NETFILTER_XT_MATCH_SCTP) += xt_sctp.o - obj-$(CONFIG_NETFILTER_XT_MATCH_STATE) += xt_state.o -+obj-$(CONFIG_NETFILTER_XT_MATCH_LAYER7) += xt_layer7.o - obj-$(CONFIG_NETFILTER_XT_MATCH_STATISTIC) += xt_statistic.o - obj-$(CONFIG_NETFILTER_XT_MATCH_STRING) += xt_string.o - obj-$(CONFIG_NETFILTER_XT_MATCH_TCPMSS) += xt_tcpmss.o ---- /dev/null -+++ b/net/netfilter/xt_layer7.c -@@ -0,0 +1,634 @@ -+/* -+ Kernel module to match application layer (OSI layer 7) data in connections. -+ -+ http://l7-filter.sf.net -+ -+ (C) 2003, 2004, 2005, 2006, 2007 Matthew Strait and Ethan Sommer. -+ -+ This program is free software; you can redistribute it and/or -+ modify it under the terms of the GNU General Public License -+ as published by the Free Software Foundation; either version -+ 2 of the License, or (at your option) any later version. -+ http://www.gnu.org/licenses/gpl.txt -+ -+ Based on ipt_string.c (C) 2000 Emmanuel Roger <winfield@freegates.be>, -+ xt_helper.c (C) 2002 Harald Welte and cls_layer7.c (C) 2003 Matthew Strait, -+ Ethan Sommer, Justin Levandoski. -+*/ -+ -+#include <linux/spinlock.h> -+#include <linux/version.h> -+#include <net/ip.h> -+#include <net/tcp.h> -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/netfilter.h> -+#include <net/netfilter/nf_conntrack.h> -+#include <net/netfilter/nf_conntrack_core.h> -+#include <linux/netfilter/x_tables.h> -+#include <linux/netfilter/xt_layer7.h> -+#include <linux/ctype.h> -+#include <linux/proc_fs.h> -+ -+#include "regexp/regexp.c" -+ -+MODULE_LICENSE("GPL"); -+MODULE_AUTHOR("Matthew Strait <quadong@users.sf.net>, Ethan Sommer <sommere@users.sf.net>"); -+MODULE_DESCRIPTION("iptables application layer match module"); -+MODULE_ALIAS("ipt_layer7"); -+MODULE_VERSION("2.17"); -+ -+static int maxdatalen = 2048; // this is the default -+module_param(maxdatalen, int, 0444); -+MODULE_PARM_DESC(maxdatalen, "maximum bytes of data looked at by l7-filter"); -+#ifdef CONFIG_NETFILTER_XT_MATCH_LAYER7_DEBUG -+ #define DPRINTK(format,args...) printk(format,##args) -+#else -+ #define DPRINTK(format,args...) -+#endif -+ -+#define TOTAL_PACKETS master_conntrack->counters[IP_CT_DIR_ORIGINAL].packets + \ -+ master_conntrack->counters[IP_CT_DIR_REPLY].packets -+ -+/* Number of packets whose data we look at. -+This can be modified through /proc/net/layer7_numpackets */ -+static int num_packets = 10; -+ -+static struct pattern_cache { -+ char * regex_string; -+ regexp * pattern; -+ struct pattern_cache * next; -+} * first_pattern_cache = NULL; -+ -+DEFINE_SPINLOCK(l7_lock); -+ -+#ifdef CONFIG_IP_NF_MATCH_LAYER7_DEBUG -+/* Converts an unfriendly string into a friendly one by -+replacing unprintables with periods and all whitespace with " ". */ -+static char * friendly_print(unsigned char * s) -+{ -+ char * f = kmalloc(strlen(s) + 1, GFP_ATOMIC); -+ int i; -+ -+ if(!f) { -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in " -+ "friendly_print, bailing.\n"); -+ return NULL; -+ } -+ -+ for(i = 0; i < strlen(s); i++){ -+ if(isprint(s[i]) && s[i] < 128) f[i] = s[i]; -+ else if(isspace(s[i])) f[i] = ' '; -+ else f[i] = '.'; -+ } -+ f[i] = '\0'; -+ return f; -+} -+ -+static char dec2hex(int i) -+{ -+ switch (i) { -+ case 0 ... 9: -+ return (i + '0'); -+ break; -+ case 10 ... 15: -+ return (i - 10 + 'a'); -+ break; -+ default: -+ if (net_ratelimit()) -+ printk("layer7: Problem in dec2hex\n"); -+ return '\0'; -+ } -+} -+ -+static char * hex_print(unsigned char * s) -+{ -+ char * g = kmalloc(strlen(s)*3 + 1, GFP_ATOMIC); -+ int i; -+ -+ if(!g) { -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in hex_print, " -+ "bailing.\n"); -+ return NULL; -+ } -+ -+ for(i = 0; i < strlen(s); i++) { -+ g[i*3 ] = dec2hex(s[i]/16); -+ g[i*3 + 1] = dec2hex(s[i]%16); -+ g[i*3 + 2] = ' '; -+ } -+ g[i*3] = '\0'; -+ -+ return g; -+} -+#endif // DEBUG -+ -+/* Use instead of regcomp. As we expect to be seeing the same regexps over and -+over again, it make sense to cache the results. */ -+static regexp * compile_and_cache(const char * regex_string, -+ const char * protocol) -+{ -+ struct pattern_cache * node = first_pattern_cache; -+ struct pattern_cache * last_pattern_cache = first_pattern_cache; -+ struct pattern_cache * tmp; -+ unsigned int len; -+ -+ while (node != NULL) { -+ if (!strcmp(node->regex_string, regex_string)) -+ return node->pattern; -+ -+ last_pattern_cache = node;/* points at the last non-NULL node */ -+ node = node->next; -+ } -+ -+ /* If we reach the end of the list, then we have not yet cached -+ the pattern for this regex. Let's do that now. -+ Be paranoid about running out of memory to avoid list corruption. */ -+ tmp = kmalloc(sizeof(struct pattern_cache), GFP_ATOMIC); -+ -+ if(!tmp) { -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in " -+ "compile_and_cache, bailing.\n"); -+ return NULL; -+ } -+ -+ tmp->regex_string = kmalloc(strlen(regex_string) + 1, GFP_ATOMIC); -+ tmp->pattern = kmalloc(sizeof(struct regexp), GFP_ATOMIC); -+ tmp->next = NULL; -+ -+ if(!tmp->regex_string || !tmp->pattern) { -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in " -+ "compile_and_cache, bailing.\n"); -+ kfree(tmp->regex_string); -+ kfree(tmp->pattern); -+ kfree(tmp); -+ return NULL; -+ } -+ -+ /* Ok. The new node is all ready now. */ -+ node = tmp; -+ -+ if(first_pattern_cache == NULL) /* list is empty */ -+ first_pattern_cache = node; /* make node the beginning */ -+ else -+ last_pattern_cache->next = node; /* attach node to the end */ -+ -+ /* copy the string and compile the regex */ -+ len = strlen(regex_string); -+ DPRINTK("About to compile this: \"%s\"\n", regex_string); -+ node->pattern = regcomp((char *)regex_string, &len); -+ if ( !node->pattern ) { -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: Error compiling regexp " -+ "\"%s\" (%s)\n", -+ regex_string, protocol); -+ /* pattern is now cached as NULL, so we won't try again. */ -+ } -+ -+ strcpy(node->regex_string, regex_string); -+ return node->pattern; -+} -+ -+static int can_handle(const struct sk_buff *skb) -+{ -+ if(!ip_hdr(skb)) /* not IP */ -+ return 0; -+ if(ip_hdr(skb)->protocol != IPPROTO_TCP && -+ ip_hdr(skb)->protocol != IPPROTO_UDP && -+ ip_hdr(skb)->protocol != IPPROTO_ICMP) -+ return 0; -+ return 1; -+} -+ -+/* Returns offset the into the skb->data that the application data starts */ -+static int app_data_offset(const struct sk_buff *skb) -+{ -+ /* In case we are ported somewhere (ebtables?) where ip_hdr(skb) -+ isn't set, this can be gotten from 4*(skb->data[0] & 0x0f) as well. */ -+ int ip_hl = 4*ip_hdr(skb)->ihl; -+ -+ if( ip_hdr(skb)->protocol == IPPROTO_TCP ) { -+ /* 12 == offset into TCP header for the header length field. -+ Can't get this with skb->h.th->doff because the tcphdr -+ struct doesn't get set when routing (this is confirmed to be -+ true in Netfilter as well as QoS.) */ -+ int tcp_hl = 4*(skb->data[ip_hl + 12] >> 4); -+ -+ return ip_hl + tcp_hl; -+ } else if( ip_hdr(skb)->protocol == IPPROTO_UDP ) { -+ return ip_hl + 8; /* UDP header is always 8 bytes */ -+ } else if( ip_hdr(skb)->protocol == IPPROTO_ICMP ) { -+ return ip_hl + 8; /* ICMP header is 8 bytes */ -+ } else { -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: tried to handle unknown " -+ "protocol!\n"); -+ return ip_hl + 8; /* something reasonable */ -+ } -+} -+ -+/* handles whether there's a match when we aren't appending data anymore */ -+static int match_no_append(struct nf_conn * conntrack, -+ struct nf_conn * master_conntrack, -+ enum ip_conntrack_info ctinfo, -+ enum ip_conntrack_info master_ctinfo, -+ const struct xt_layer7_info * info) -+{ -+ /* If we're in here, throw the app data away */ -+ if(master_conntrack->layer7.app_data != NULL) { -+ -+ #ifdef CONFIG_IP_NF_MATCH_LAYER7_DEBUG -+ if(!master_conntrack->layer7.app_proto) { -+ char * f = -+ friendly_print(master_conntrack->layer7.app_data); -+ char * g = -+ hex_print(master_conntrack->layer7.app_data); -+ DPRINTK("\nl7-filter gave up after %d bytes " -+ "(%d packets):\n%s\n", -+ strlen(f), TOTAL_PACKETS, f); -+ kfree(f); -+ DPRINTK("In hex: %s\n", g); -+ kfree(g); -+ } -+ #endif -+ -+ kfree(master_conntrack->layer7.app_data); -+ master_conntrack->layer7.app_data = NULL; /* don't free again */ -+ } -+ -+ if(master_conntrack->layer7.app_proto){ -+ /* Here child connections set their .app_proto (for /proc) */ -+ if(!conntrack->layer7.app_proto) { -+ conntrack->layer7.app_proto = -+ kmalloc(strlen(master_conntrack->layer7.app_proto)+1, -+ GFP_ATOMIC); -+ if(!conntrack->layer7.app_proto){ -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory " -+ "in match_no_append, " -+ "bailing.\n"); -+ return 1; -+ } -+ strcpy(conntrack->layer7.app_proto, -+ master_conntrack->layer7.app_proto); -+ } -+ -+ return (!strcmp(master_conntrack->layer7.app_proto, -+ info->protocol)); -+ } -+ else { -+ /* If not classified, set to "unknown" to distinguish from -+ connections that are still being tested. */ -+ master_conntrack->layer7.app_proto = -+ kmalloc(strlen("unknown")+1, GFP_ATOMIC); -+ if(!master_conntrack->layer7.app_proto){ -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in " -+ "match_no_append, bailing.\n"); -+ return 1; -+ } -+ strcpy(master_conntrack->layer7.app_proto, "unknown"); -+ return 0; -+ } -+} -+ -+/* add the new app data to the conntrack. Return number of bytes added. */ -+static int add_data(struct nf_conn * master_conntrack, -+ char * app_data, int appdatalen) -+{ -+ int length = 0, i; -+ int oldlength = master_conntrack->layer7.app_data_len; -+ -+ /* This is a fix for a race condition by Deti Fliegl. However, I'm not -+ clear on whether the race condition exists or whether this really -+ fixes it. I might just be being dense... Anyway, if it's not really -+ a fix, all it does is waste a very small amount of time. */ -+ if(!master_conntrack->layer7.app_data) return 0; -+ -+ /* Strip nulls. Make everything lower case (our regex lib doesn't -+ do case insensitivity). Add it to the end of the current data. */ -+ for(i = 0; i < maxdatalen-oldlength-1 && -+ i < appdatalen; i++) { -+ if(app_data[i] != '\0') { -+ /* the kernel version of tolower mungs 'upper ascii' */ -+ master_conntrack->layer7.app_data[length+oldlength] = -+ isascii(app_data[i])? -+ tolower(app_data[i]) : app_data[i]; -+ length++; -+ } -+ } -+ -+ master_conntrack->layer7.app_data[length+oldlength] = '\0'; -+ master_conntrack->layer7.app_data_len = length + oldlength; -+ -+ return length; -+} -+ -+/* taken from drivers/video/modedb.c */ -+static int my_atoi(const char *s) -+{ -+ int val = 0; -+ -+ for (;; s++) { -+ switch (*s) { -+ case '0'...'9': -+ val = 10*val+(*s-'0'); -+ break; -+ default: -+ return val; -+ } -+ } -+} -+ -+/* write out num_packets to userland. */ -+static int layer7_read_proc(char* page, char ** start, off_t off, int count, -+ int* eof, void * data) -+{ -+ if(num_packets > 99 && net_ratelimit()) -+ printk(KERN_ERR "layer7: NOT REACHED. num_packets too big\n"); -+ -+ page[0] = num_packets/10 + '0'; -+ page[1] = num_packets%10 + '0'; -+ page[2] = '\n'; -+ page[3] = '\0'; -+ -+ *eof=1; -+ -+ return 3; -+} -+ -+/* Read in num_packets from userland */ -+static int layer7_write_proc(struct file* file, const char* buffer, -+ unsigned long count, void *data) -+{ -+ char * foo = kmalloc(count, GFP_ATOMIC); -+ -+ if(!foo){ -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory, bailing. " -+ "num_packets unchanged.\n"); -+ return count; -+ } -+ -+ if(copy_from_user(foo, buffer, count)) { -+ return -EFAULT; -+ } -+ -+ -+ num_packets = my_atoi(foo); -+ kfree (foo); -+ -+ /* This has an arbitrary limit to make the math easier. I'm lazy. -+ But anyway, 99 is a LOT! If you want more, you're doing it wrong! */ -+ if(num_packets > 99) { -+ printk(KERN_WARNING "layer7: num_packets can't be > 99.\n"); -+ num_packets = 99; -+ } else if(num_packets < 1) { -+ printk(KERN_WARNING "layer7: num_packets can't be < 1.\n"); -+ num_packets = 1; -+ } -+ -+ return count; -+} -+ -+static int -+match(const struct sk_buff *skbin, -+ const struct net_device *in, -+ const struct net_device *out, -+ const struct xt_match *match, -+ const void *matchinfo, -+ int offset, -+ unsigned int protoff, -+ int *hotdrop) -+{ -+ /* sidestep const without getting a compiler warning... */ -+ struct sk_buff * skb = (struct sk_buff *)skbin; -+ -+ const struct xt_layer7_info * info = matchinfo; -+ enum ip_conntrack_info master_ctinfo, ctinfo; -+ struct nf_conn *master_conntrack, *conntrack; -+ unsigned char * app_data; -+ unsigned int pattern_result, appdatalen; -+ regexp * comppattern; -+ -+ /* Be paranoid/incompetent - lock the entire match function. */ -+ spin_lock_bh(&l7_lock); -+ -+ if(!can_handle(skb)){ -+ DPRINTK("layer7: This is some protocol I can't handle.\n"); -+ spin_unlock_bh(&l7_lock); -+ return info->invert; -+ } -+ -+ /* Treat parent & all its children together as one connection, except -+ for the purpose of setting conntrack->layer7.app_proto in the actual -+ connection. This makes /proc/net/ip_conntrack more satisfying. */ -+ if(!(conntrack = nf_ct_get(skb, &ctinfo)) || -+ !(master_conntrack=nf_ct_get(skb,&master_ctinfo))){ -+ DPRINTK("layer7: couldn't get conntrack.\n"); -+ spin_unlock_bh(&l7_lock); -+ return info->invert; -+ } -+ -+ /* Try to get a master conntrack (and its master etc) for FTP, etc. */ -+ while (master_ct(master_conntrack) != NULL) -+ master_conntrack = master_ct(master_conntrack); -+ -+ /* if we've classified it or seen too many packets */ -+ if(TOTAL_PACKETS > num_packets || -+ master_conntrack->layer7.app_proto) { -+ -+ pattern_result = match_no_append(conntrack, master_conntrack, -+ ctinfo, master_ctinfo, info); -+ -+ /* skb->cb[0] == seen. Don't do things twice if there are -+ multiple l7 rules. I'm not sure that using cb for this purpose -+ is correct, even though it says "put your private variables -+ there". But it doesn't look like it is being used for anything -+ else in the skbs that make it here. */ -+ skb->cb[0] = 1; /* marking it seen here's probably irrelevant */ -+ -+ spin_unlock_bh(&l7_lock); -+ return (pattern_result ^ info->invert); -+ } -+ -+ if(skb_is_nonlinear(skb)){ -+ if(skb_linearize(skb) != 0){ -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: failed to linearize " -+ "packet, bailing.\n"); -+ spin_unlock_bh(&l7_lock); -+ return info->invert; -+ } -+ } -+ -+ /* now that the skb is linearized, it's safe to set these. */ -+ app_data = skb->data + app_data_offset(skb); -+ appdatalen = skb_tail_pointer(skb) - app_data; -+ -+ /* the return value gets checked later, when we're ready to use it */ -+ comppattern = compile_and_cache(info->pattern, info->protocol); -+ -+ /* On the first packet of a connection, allocate space for app data */ -+ if(TOTAL_PACKETS == 1 && !skb->cb[0] && -+ !master_conntrack->layer7.app_data){ -+ master_conntrack->layer7.app_data = -+ kmalloc(maxdatalen, GFP_ATOMIC); -+ if(!master_conntrack->layer7.app_data){ -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in " -+ "match, bailing.\n"); -+ spin_unlock_bh(&l7_lock); -+ return info->invert; -+ } -+ -+ master_conntrack->layer7.app_data[0] = '\0'; -+ } -+ -+ /* Can be here, but unallocated, if numpackets is increased near -+ the beginning of a connection */ -+ if(master_conntrack->layer7.app_data == NULL){ -+ spin_unlock_bh(&l7_lock); -+ return (info->invert); /* unmatched */ -+ } -+ -+ if(!skb->cb[0]){ -+ int newbytes; -+ newbytes = add_data(master_conntrack, app_data, appdatalen); -+ -+ if(newbytes == 0) { /* didn't add any data */ -+ skb->cb[0] = 1; -+ /* Didn't match before, not going to match now */ -+ spin_unlock_bh(&l7_lock); -+ return info->invert; -+ } -+ } -+ -+ /* If looking for "unknown", then never match. "Unknown" means that -+ we've given up; we're still trying with these packets. */ -+ if(!strcmp(info->protocol, "unknown")) { -+ pattern_result = 0; -+ /* If looking for "unset", then always match. "Unset" means that we -+ haven't yet classified the connection. */ -+ } else if(!strcmp(info->protocol, "unset")) { -+ pattern_result = 2; -+ DPRINTK("layer7: matched unset: not yet classified " -+ "(%d/%d packets)\n", TOTAL_PACKETS, num_packets); -+ /* If the regexp failed to compile, don't bother running it */ -+ } else if(comppattern && -+ regexec(comppattern, master_conntrack->layer7.app_data)){ -+ DPRINTK("layer7: matched %s\n", info->protocol); -+ pattern_result = 1; -+ } else pattern_result = 0; -+ -+ if(pattern_result == 1) { -+ master_conntrack->layer7.app_proto = -+ kmalloc(strlen(info->protocol)+1, GFP_ATOMIC); -+ if(!master_conntrack->layer7.app_proto){ -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in " -+ "match, bailing.\n"); -+ spin_unlock_bh(&l7_lock); -+ return (pattern_result ^ info->invert); -+ } -+ strcpy(master_conntrack->layer7.app_proto, info->protocol); -+ } else if(pattern_result > 1) { /* cleanup from "unset" */ -+ pattern_result = 1; -+ } -+ -+ /* mark the packet seen */ -+ skb->cb[0] = 1; -+ -+ spin_unlock_bh(&l7_lock); -+ return (pattern_result ^ info->invert); -+} -+ -+static int check(const char *tablename, -+ const void *inf, -+ const struct xt_match *match, -+ void *matchinfo, -+ unsigned int hook_mask) -+ -+{ -+ // load nf_conntrack_ipv4 -+ if (nf_ct_l3proto_try_module_get(match->family) < 0) { -+ printk(KERN_WARNING "can't load conntrack support for " -+ "proto=%d\n", match->family); -+ return false; -+ } -+ return true; -+} -+ -+static void -+destroy(const struct xt_match *match, void *matchinfo) -+{ -+ nf_ct_l3proto_module_put(match->family); -+} -+ -+static struct xt_match xt_layer7_match[] = { -+{ -+ .name = "layer7", -+ .family = AF_INET, -+ .checkentry = check, -+ .match = match, -+ .destroy = destroy, -+ .matchsize = sizeof(struct xt_layer7_info), -+ .me = THIS_MODULE -+} -+}; -+ -+static void layer7_cleanup_proc(void) -+{ -+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) -+ remove_proc_entry("layer7_numpackets", proc_net); -+#else -+ remove_proc_entry("layer7_numpackets", init_net.proc_net); -+#endif -+} -+ -+/* register the proc file */ -+static void layer7_init_proc(void) -+{ -+ struct proc_dir_entry* entry; -+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) -+ entry = create_proc_entry("layer7_numpackets", 0644, proc_net); -+#else -+ entry = create_proc_entry("layer7_numpackets", 0644, init_net.proc_net); -+#endif -+ entry->read_proc = layer7_read_proc; -+ entry->write_proc = layer7_write_proc; -+} -+ -+static int __init xt_layer7_init(void) -+{ -+ need_conntrack(); -+ -+ layer7_init_proc(); -+ if(maxdatalen < 1) { -+ printk(KERN_WARNING "layer7: maxdatalen can't be < 1, " -+ "using 1\n"); -+ maxdatalen = 1; -+ } -+ /* This is not a hard limit. It's just here to prevent people from -+ bringing their slow machines to a grinding halt. */ -+ else if(maxdatalen > 65536) { -+ printk(KERN_WARNING "layer7: maxdatalen can't be > 65536, " -+ "using 65536\n"); -+ maxdatalen = 65536; -+ } -+ return xt_register_matches(xt_layer7_match, -+ ARRAY_SIZE(xt_layer7_match)); -+} -+ -+static void __exit xt_layer7_fini(void) -+{ -+ layer7_cleanup_proc(); -+ xt_unregister_matches(xt_layer7_match, ARRAY_SIZE(xt_layer7_match)); -+} -+ -+module_init(xt_layer7_init); -+module_exit(xt_layer7_fini); ---- /dev/null -+++ b/net/netfilter/regexp/regexp.c -@@ -0,0 +1,1197 @@ -+/* -+ * regcomp and regexec -- regsub and regerror are elsewhere -+ * @(#)regexp.c 1.3 of 18 April 87 -+ * -+ * Copyright (c) 1986 by University of Toronto. -+ * Written by Henry Spencer. Not derived from licensed software. -+ * -+ * Permission is granted to anyone to use this software for any -+ * purpose on any computer system, and to redistribute it freely, -+ * subject to the following restrictions: -+ * -+ * 1. The author is not responsible for the consequences of use of -+ * this software, no matter how awful, even if they arise -+ * from defects in it. -+ * -+ * 2. The origin of this software must not be misrepresented, either -+ * by explicit claim or by omission. -+ * -+ * 3. Altered versions must be plainly marked as such, and must not -+ * be misrepresented as being the original software. -+ * -+ * Beware that some of this code is subtly aware of the way operator -+ * precedence is structured in regular expressions. Serious changes in -+ * regular-expression syntax might require a total rethink. -+ * -+ * This code was modified by Ethan Sommer to work within the kernel -+ * (it now uses kmalloc etc..) -+ * -+ * Modified slightly by Matthew Strait to use more modern C. -+ */ -+ -+#include "regexp.h" -+#include "regmagic.h" -+ -+/* added by ethan and matt. Lets it work in both kernel and user space. -+(So iptables can use it, for instance.) Yea, it goes both ways... */ -+#if __KERNEL__ -+ #define malloc(foo) kmalloc(foo,GFP_ATOMIC) -+#else -+ #define printk(format,args...) printf(format,##args) -+#endif -+ -+void regerror(char * s) -+{ -+ printk("<3>Regexp: %s\n", s); -+ /* NOTREACHED */ -+} -+ -+/* -+ * The "internal use only" fields in regexp.h are present to pass info from -+ * compile to execute that permits the execute phase to run lots faster on -+ * simple cases. They are: -+ * -+ * regstart char that must begin a match; '\0' if none obvious -+ * reganch is the match anchored (at beginning-of-line only)? -+ * regmust string (pointer into program) that match must include, or NULL -+ * regmlen length of regmust string -+ * -+ * Regstart and reganch permit very fast decisions on suitable starting points -+ * for a match, cutting down the work a lot. Regmust permits fast rejection -+ * of lines that cannot possibly match. The regmust tests are costly enough -+ * that regcomp() supplies a regmust only if the r.e. contains something -+ * potentially expensive (at present, the only such thing detected is * or + -+ * at the start of the r.e., which can involve a lot of backup). Regmlen is -+ * supplied because the test in regexec() needs it and regcomp() is computing -+ * it anyway. -+ */ -+ -+/* -+ * Structure for regexp "program". This is essentially a linear encoding -+ * of a nondeterministic finite-state machine (aka syntax charts or -+ * "railroad normal form" in parsing technology). Each node is an opcode -+ * plus a "next" pointer, possibly plus an operand. "Next" pointers of -+ * all nodes except BRANCH implement concatenation; a "next" pointer with -+ * a BRANCH on both ends of it is connecting two alternatives. (Here we -+ * have one of the subtle syntax dependencies: an individual BRANCH (as -+ * opposed to a collection of them) is never concatenated with anything -+ * because of operator precedence.) The operand of some types of node is -+ * a literal string; for others, it is a node leading into a sub-FSM. In -+ * particular, the operand of a BRANCH node is the first node of the branch. -+ * (NB this is *not* a tree structure: the tail of the branch connects -+ * to the thing following the set of BRANCHes.) The opcodes are: -+ */ -+ -+/* definition number opnd? meaning */ -+#define END 0 /* no End of program. */ -+#define BOL 1 /* no Match "" at beginning of line. */ -+#define EOL 2 /* no Match "" at end of line. */ -+#define ANY 3 /* no Match any one character. */ -+#define ANYOF 4 /* str Match any character in this string. */ -+#define ANYBUT 5 /* str Match any character not in this string. */ -+#define BRANCH 6 /* node Match this alternative, or the next... */ -+#define BACK 7 /* no Match "", "next" ptr points backward. */ -+#define EXACTLY 8 /* str Match this string. */ -+#define NOTHING 9 /* no Match empty string. */ -+#define STAR 10 /* node Match this (simple) thing 0 or more times. */ -+#define PLUS 11 /* node Match this (simple) thing 1 or more times. */ -+#define OPEN 20 /* no Mark this point in input as start of #n. */ -+ /* OPEN+1 is number 1, etc. */ -+#define CLOSE 30 /* no Analogous to OPEN. */ -+ -+/* -+ * Opcode notes: -+ * -+ * BRANCH The set of branches constituting a single choice are hooked -+ * together with their "next" pointers, since precedence prevents -+ * anything being concatenated to any individual branch. The -+ * "next" pointer of the last BRANCH in a choice points to the -+ * thing following the whole choice. This is also where the -+ * final "next" pointer of each individual branch points; each -+ * branch starts with the operand node of a BRANCH node. -+ * -+ * BACK Normal "next" pointers all implicitly point forward; BACK -+ * exists to make loop structures possible. -+ * -+ * STAR,PLUS '?', and complex '*' and '+', are implemented as circular -+ * BRANCH structures using BACK. Simple cases (one character -+ * per match) are implemented with STAR and PLUS for speed -+ * and to minimize recursive plunges. -+ * -+ * OPEN,CLOSE ...are numbered at compile time. -+ */ -+ -+/* -+ * A node is one char of opcode followed by two chars of "next" pointer. -+ * "Next" pointers are stored as two 8-bit pieces, high order first. The -+ * value is a positive offset from the opcode of the node containing it. -+ * An operand, if any, simply follows the node. (Note that much of the -+ * code generation knows about this implicit relationship.) -+ * -+ * Using two bytes for the "next" pointer is vast overkill for most things, -+ * but allows patterns to get big without disasters. -+ */ -+#define OP(p) (*(p)) -+#define NEXT(p) (((*((p)+1)&0377)<<8) + (*((p)+2)&0377)) -+#define OPERAND(p) ((p) + 3) -+ -+/* -+ * See regmagic.h for one further detail of program structure. -+ */ -+ -+ -+/* -+ * Utility definitions. -+ */ -+#ifndef CHARBITS -+#define UCHARAT(p) ((int)*(unsigned char *)(p)) -+#else -+#define UCHARAT(p) ((int)*(p)&CHARBITS) -+#endif -+ -+#define FAIL(m) { regerror(m); return(NULL); } -+#define ISMULT(c) ((c) == '*' || (c) == '+' || (c) == '?') -+#define META "^$.[()|?+*\\" -+ -+/* -+ * Flags to be passed up and down. -+ */ -+#define HASWIDTH 01 /* Known never to match null string. */ -+#define SIMPLE 02 /* Simple enough to be STAR/PLUS operand. */ -+#define SPSTART 04 /* Starts with * or +. */ -+#define WORST 0 /* Worst case. */ -+ -+/* -+ * Global work variables for regcomp(). -+ */ -+struct match_globals { -+char *reginput; /* String-input pointer. */ -+char *regbol; /* Beginning of input, for ^ check. */ -+char **regstartp; /* Pointer to startp array. */ -+char **regendp; /* Ditto for endp. */ -+char *regparse; /* Input-scan pointer. */ -+int regnpar; /* () count. */ -+char regdummy; -+char *regcode; /* Code-emit pointer; ®dummy = don't. */ -+long regsize; /* Code size. */ -+}; -+ -+/* -+ * Forward declarations for regcomp()'s friends. -+ */ -+#ifndef STATIC -+#define STATIC static -+#endif -+STATIC char *reg(struct match_globals *g, int paren,int *flagp); -+STATIC char *regbranch(struct match_globals *g, int *flagp); -+STATIC char *regpiece(struct match_globals *g, int *flagp); -+STATIC char *regatom(struct match_globals *g, int *flagp); -+STATIC char *regnode(struct match_globals *g, char op); -+STATIC char *regnext(struct match_globals *g, char *p); -+STATIC void regc(struct match_globals *g, char b); -+STATIC void reginsert(struct match_globals *g, char op, char *opnd); -+STATIC void regtail(struct match_globals *g, char *p, char *val); -+STATIC void regoptail(struct match_globals *g, char *p, char *val); -+ -+ -+__kernel_size_t my_strcspn(const char *s1,const char *s2) -+{ -+ char *scan1; -+ char *scan2; -+ int count; -+ -+ count = 0; -+ for (scan1 = (char *)s1; *scan1 != '\0'; scan1++) { -+ for (scan2 = (char *)s2; *scan2 != '\0';) /* ++ moved down. */ -+ if (*scan1 == *scan2++) -+ return(count); -+ count++; -+ } -+ return(count); -+} -+ -+/* -+ - regcomp - compile a regular expression into internal code -+ * -+ * We can't allocate space until we know how big the compiled form will be, -+ * but we can't compile it (and thus know how big it is) until we've got a -+ * place to put the code. So we cheat: we compile it twice, once with code -+ * generation turned off and size counting turned on, and once "for real". -+ * This also means that we don't allocate space until we are sure that the -+ * thing really will compile successfully, and we never have to move the -+ * code and thus invalidate pointers into it. (Note that it has to be in -+ * one piece because free() must be able to free it all.) -+ * -+ * Beware that the optimization-preparation code in here knows about some -+ * of the structure of the compiled regexp. -+ */ -+regexp * -+regcomp(char *exp,int *patternsize) -+{ -+ register regexp *r; -+ register char *scan; -+ register char *longest; -+ register int len; -+ int flags; -+ struct match_globals g; -+ -+ /* commented out by ethan -+ extern char *malloc(); -+ */ -+ -+ if (exp == NULL) -+ FAIL("NULL argument"); -+ -+ /* First pass: determine size, legality. */ -+ g.regparse = exp; -+ g.regnpar = 1; -+ g.regsize = 0L; -+ g.regcode = &g.regdummy; -+ regc(&g, MAGIC); -+ if (reg(&g, 0, &flags) == NULL) -+ return(NULL); -+ -+ /* Small enough for pointer-storage convention? */ -+ if (g.regsize >= 32767L) /* Probably could be 65535L. */ -+ FAIL("regexp too big"); -+ -+ /* Allocate space. */ -+ *patternsize=sizeof(regexp) + (unsigned)g.regsize; -+ r = (regexp *)malloc(sizeof(regexp) + (unsigned)g.regsize); -+ if (r == NULL) -+ FAIL("out of space"); -+ -+ /* Second pass: emit code. */ -+ g.regparse = exp; -+ g.regnpar = 1; -+ g.regcode = r->program; -+ regc(&g, MAGIC); -+ if (reg(&g, 0, &flags) == NULL) -+ return(NULL); -+ -+ /* Dig out information for optimizations. */ -+ r->regstart = '\0'; /* Worst-case defaults. */ -+ r->reganch = 0; -+ r->regmust = NULL; -+ r->regmlen = 0; -+ scan = r->program+1; /* First BRANCH. */ -+ if (OP(regnext(&g, scan)) == END) { /* Only one top-level choice. */ -+ scan = OPERAND(scan); -+ -+ /* Starting-point info. */ -+ if (OP(scan) == EXACTLY) -+ r->regstart = *OPERAND(scan); -+ else if (OP(scan) == BOL) -+ r->reganch++; -+ -+ /* -+ * If there's something expensive in the r.e., find the -+ * longest literal string that must appear and make it the -+ * regmust. Resolve ties in favor of later strings, since -+ * the regstart check works with the beginning of the r.e. -+ * and avoiding duplication strengthens checking. Not a -+ * strong reason, but sufficient in the absence of others. -+ */ -+ if (flags&SPSTART) { -+ longest = NULL; -+ len = 0; -+ for (; scan != NULL; scan = regnext(&g, scan)) -+ if (OP(scan) == EXACTLY && strlen(OPERAND(scan)) >= len) { -+ longest = OPERAND(scan); -+ len = strlen(OPERAND(scan)); -+ } -+ r->regmust = longest; -+ r->regmlen = len; -+ } -+ } -+ -+ return(r); -+} -+ -+/* -+ - reg - regular expression, i.e. main body or parenthesized thing -+ * -+ * Caller must absorb opening parenthesis. -+ * -+ * Combining parenthesis handling with the base level of regular expression -+ * is a trifle forced, but the need to tie the tails of the branches to what -+ * follows makes it hard to avoid. -+ */ -+static char * -+reg(struct match_globals *g, int paren, int *flagp /* Parenthesized? */ ) -+{ -+ register char *ret; -+ register char *br; -+ register char *ender; -+ register int parno = 0; /* 0 makes gcc happy */ -+ int flags; -+ -+ *flagp = HASWIDTH; /* Tentatively. */ -+ -+ /* Make an OPEN node, if parenthesized. */ -+ if (paren) { -+ if (g->regnpar >= NSUBEXP) -+ FAIL("too many ()"); -+ parno = g->regnpar; -+ g->regnpar++; -+ ret = regnode(g, OPEN+parno); -+ } else -+ ret = NULL; -+ -+ /* Pick up the branches, linking them together. */ -+ br = regbranch(g, &flags); -+ if (br == NULL) -+ return(NULL); -+ if (ret != NULL) -+ regtail(g, ret, br); /* OPEN -> first. */ -+ else -+ ret = br; -+ if (!(flags&HASWIDTH)) -+ *flagp &= ~HASWIDTH; -+ *flagp |= flags&SPSTART; -+ while (*g->regparse == '|') { -+ g->regparse++; -+ br = regbranch(g, &flags); -+ if (br == NULL) -+ return(NULL); -+ regtail(g, ret, br); /* BRANCH -> BRANCH. */ -+ if (!(flags&HASWIDTH)) -+ *flagp &= ~HASWIDTH; -+ *flagp |= flags&SPSTART; -+ } -+ -+ /* Make a closing node, and hook it on the end. */ -+ ender = regnode(g, (paren) ? CLOSE+parno : END); -+ regtail(g, ret, ender); -+ -+ /* Hook the tails of the branches to the closing node. */ -+ for (br = ret; br != NULL; br = regnext(g, br)) -+ regoptail(g, br, ender); -+ -+ /* Check for proper termination. */ -+ if (paren && *g->regparse++ != ')') { -+ FAIL("unmatched ()"); -+ } else if (!paren && *g->regparse != '\0') { -+ if (*g->regparse == ')') { -+ FAIL("unmatched ()"); -+ } else -+ FAIL("junk on end"); /* "Can't happen". */ -+ /* NOTREACHED */ -+ } -+ -+ return(ret); -+} -+ -+/* -+ - regbranch - one alternative of an | operator -+ * -+ * Implements the concatenation operator. -+ */ -+static char * -+regbranch(struct match_globals *g, int *flagp) -+{ -+ register char *ret; -+ register char *chain; -+ register char *latest; -+ int flags; -+ -+ *flagp = WORST; /* Tentatively. */ -+ -+ ret = regnode(g, BRANCH); -+ chain = NULL; -+ while (*g->regparse != '\0' && *g->regparse != '|' && *g->regparse != ')') { -+ latest = regpiece(g, &flags); -+ if (latest == NULL) -+ return(NULL); -+ *flagp |= flags&HASWIDTH; -+ if (chain == NULL) /* First piece. */ -+ *flagp |= flags&SPSTART; -+ else -+ regtail(g, chain, latest); -+ chain = latest; -+ } -+ if (chain == NULL) /* Loop ran zero times. */ -+ (void) regnode(g, NOTHING); -+ -+ return(ret); -+} -+ -+/* -+ - regpiece - something followed by possible [*+?] -+ * -+ * Note that the branching code sequences used for ? and the general cases -+ * of * and + are somewhat optimized: they use the same NOTHING node as -+ * both the endmarker for their branch list and the body of the last branch. -+ * It might seem that this node could be dispensed with entirely, but the -+ * endmarker role is not redundant. -+ */ -+static char * -+regpiece(struct match_globals *g, int *flagp) -+{ -+ register char *ret; -+ register char op; -+ register char *next; -+ int flags; -+ -+ ret = regatom(g, &flags); -+ if (ret == NULL) -+ return(NULL); -+ -+ op = *g->regparse; -+ if (!ISMULT(op)) { -+ *flagp = flags; -+ return(ret); -+ } -+ -+ if (!(flags&HASWIDTH) && op != '?') -+ FAIL("*+ operand could be empty"); -+ *flagp = (op != '+') ? (WORST|SPSTART) : (WORST|HASWIDTH); -+ -+ if (op == '*' && (flags&SIMPLE)) -+ reginsert(g, STAR, ret); -+ else if (op == '*') { -+ /* Emit x* as (x&|), where & means "self". */ -+ reginsert(g, BRANCH, ret); /* Either x */ -+ regoptail(g, ret, regnode(g, BACK)); /* and loop */ -+ regoptail(g, ret, ret); /* back */ -+ regtail(g, ret, regnode(g, BRANCH)); /* or */ -+ regtail(g, ret, regnode(g, NOTHING)); /* null. */ -+ } else if (op == '+' && (flags&SIMPLE)) -+ reginsert(g, PLUS, ret); -+ else if (op == '+') { -+ /* Emit x+ as x(&|), where & means "self". */ -+ next = regnode(g, BRANCH); /* Either */ -+ regtail(g, ret, next); -+ regtail(g, regnode(g, BACK), ret); /* loop back */ -+ regtail(g, next, regnode(g, BRANCH)); /* or */ -+ regtail(g, ret, regnode(g, NOTHING)); /* null. */ -+ } else if (op == '?') { -+ /* Emit x? as (x|) */ -+ reginsert(g, BRANCH, ret); /* Either x */ -+ regtail(g, ret, regnode(g, BRANCH)); /* or */ -+ next = regnode(g, NOTHING); /* null. */ -+ regtail(g, ret, next); -+ regoptail(g, ret, next); -+ } -+ g->regparse++; -+ if (ISMULT(*g->regparse)) -+ FAIL("nested *?+"); -+ -+ return(ret); -+} -+ -+/* -+ - regatom - the lowest level -+ * -+ * Optimization: gobbles an entire sequence of ordinary characters so that -+ * it can turn them into a single node, which is smaller to store and -+ * faster to run. Backslashed characters are exceptions, each becoming a -+ * separate node; the code is simpler that way and it's not worth fixing. -+ */ -+static char * -+regatom(struct match_globals *g, int *flagp) -+{ -+ register char *ret; -+ int flags; -+ -+ *flagp = WORST; /* Tentatively. */ -+ -+ switch (*g->regparse++) { -+ case '^': -+ ret = regnode(g, BOL); -+ break; -+ case '$': -+ ret = regnode(g, EOL); -+ break; -+ case '.': -+ ret = regnode(g, ANY); -+ *flagp |= HASWIDTH|SIMPLE; -+ break; -+ case '[': { -+ register int class; -+ register int classend; -+ -+ if (*g->regparse == '^') { /* Complement of range. */ -+ ret = regnode(g, ANYBUT); -+ g->regparse++; -+ } else -+ ret = regnode(g, ANYOF); -+ if (*g->regparse == ']' || *g->regparse == '-') -+ regc(g, *g->regparse++); -+ while (*g->regparse != '\0' && *g->regparse != ']') { -+ if (*g->regparse == '-') { -+ g->regparse++; -+ if (*g->regparse == ']' || *g->regparse == '\0') -+ regc(g, '-'); -+ else { -+ class = UCHARAT(g->regparse-2)+1; -+ classend = UCHARAT(g->regparse); -+ if (class > classend+1) -+ FAIL("invalid [] range"); -+ for (; class <= classend; class++) -+ regc(g, class); -+ g->regparse++; -+ } -+ } else -+ regc(g, *g->regparse++); -+ } -+ regc(g, '\0'); -+ if (*g->regparse != ']') -+ FAIL("unmatched []"); -+ g->regparse++; -+ *flagp |= HASWIDTH|SIMPLE; -+ } -+ break; -+ case '(': -+ ret = reg(g, 1, &flags); -+ if (ret == NULL) -+ return(NULL); -+ *flagp |= flags&(HASWIDTH|SPSTART); -+ break; -+ case '\0': -+ case '|': -+ case ')': -+ FAIL("internal urp"); /* Supposed to be caught earlier. */ -+ break; -+ case '?': -+ case '+': -+ case '*': -+ FAIL("?+* follows nothing"); -+ break; -+ case '\\': -+ if (*g->regparse == '\0') -+ FAIL("trailing \\"); -+ ret = regnode(g, EXACTLY); -+ regc(g, *g->regparse++); -+ regc(g, '\0'); -+ *flagp |= HASWIDTH|SIMPLE; -+ break; -+ default: { -+ register int len; -+ register char ender; -+ -+ g->regparse--; -+ len = my_strcspn((const char *)g->regparse, (const char *)META); -+ if (len <= 0) -+ FAIL("internal disaster"); -+ ender = *(g->regparse+len); -+ if (len > 1 && ISMULT(ender)) -+ len--; /* Back off clear of ?+* operand. */ -+ *flagp |= HASWIDTH; -+ if (len == 1) -+ *flagp |= SIMPLE; -+ ret = regnode(g, EXACTLY); -+ while (len > 0) { -+ regc(g, *g->regparse++); -+ len--; -+ } -+ regc(g, '\0'); -+ } -+ break; -+ } -+ -+ return(ret); -+} -+ -+/* -+ - regnode - emit a node -+ */ -+static char * /* Location. */ -+regnode(struct match_globals *g, char op) -+{ -+ register char *ret; -+ register char *ptr; -+ -+ ret = g->regcode; -+ if (ret == &g->regdummy) { -+ g->regsize += 3; -+ return(ret); -+ } -+ -+ ptr = ret; -+ *ptr++ = op; -+ *ptr++ = '\0'; /* Null "next" pointer. */ -+ *ptr++ = '\0'; -+ g->regcode = ptr; -+ -+ return(ret); -+} -+ -+/* -+ - regc - emit (if appropriate) a byte of code -+ */ -+static void -+regc(struct match_globals *g, char b) -+{ -+ if (g->regcode != &g->regdummy) -+ *g->regcode++ = b; -+ else -+ g->regsize++; -+} -+ -+/* -+ - reginsert - insert an operator in front of already-emitted operand -+ * -+ * Means relocating the operand. -+ */ -+static void -+reginsert(struct match_globals *g, char op, char* opnd) -+{ -+ register char *src; -+ register char *dst; -+ register char *place; -+ -+ if (g->regcode == &g->regdummy) { -+ g->regsize += 3; -+ return; -+ } -+ -+ src = g->regcode; -+ g->regcode += 3; -+ dst = g->regcode; -+ while (src > opnd) -+ *--dst = *--src; -+ -+ place = opnd; /* Op node, where operand used to be. */ -+ *place++ = op; -+ *place++ = '\0'; -+ *place++ = '\0'; -+} -+ -+/* -+ - regtail - set the next-pointer at the end of a node chain -+ */ -+static void -+regtail(struct match_globals *g, char *p, char *val) -+{ -+ register char *scan; -+ register char *temp; -+ register int offset; -+ -+ if (p == &g->regdummy) -+ return; -+ -+ /* Find last node. */ -+ scan = p; -+ for (;;) { -+ temp = regnext(g, scan); -+ if (temp == NULL) -+ break; -+ scan = temp; -+ } -+ -+ if (OP(scan) == BACK) -+ offset = scan - val; -+ else -+ offset = val - scan; -+ *(scan+1) = (offset>>8)&0377; -+ *(scan+2) = offset&0377; -+} -+ -+/* -+ - regoptail - regtail on operand of first argument; nop if operandless -+ */ -+static void -+regoptail(struct match_globals *g, char *p, char *val) -+{ -+ /* "Operandless" and "op != BRANCH" are synonymous in practice. */ -+ if (p == NULL || p == &g->regdummy || OP(p) != BRANCH) -+ return; -+ regtail(g, OPERAND(p), val); -+} -+ -+/* -+ * regexec and friends -+ */ -+ -+ -+/* -+ * Forwards. -+ */ -+STATIC int regtry(struct match_globals *g, regexp *prog, char *string); -+STATIC int regmatch(struct match_globals *g, char *prog); -+STATIC int regrepeat(struct match_globals *g, char *p); -+ -+#ifdef DEBUG -+int regnarrate = 0; -+void regdump(); -+STATIC char *regprop(char *op); -+#endif -+ -+/* -+ - regexec - match a regexp against a string -+ */ -+int -+regexec(regexp *prog, char *string) -+{ -+ register char *s; -+ struct match_globals g; -+ -+ /* Be paranoid... */ -+ if (prog == NULL || string == NULL) { -+ printk("<3>Regexp: NULL parameter\n"); -+ return(0); -+ } -+ -+ /* Check validity of program. */ -+ if (UCHARAT(prog->program) != MAGIC) { -+ printk("<3>Regexp: corrupted program\n"); -+ return(0); -+ } -+ -+ /* If there is a "must appear" string, look for it. */ -+ if (prog->regmust != NULL) { -+ s = string; -+ while ((s = strchr(s, prog->regmust[0])) != NULL) { -+ if (strncmp(s, prog->regmust, prog->regmlen) == 0) -+ break; /* Found it. */ -+ s++; -+ } -+ if (s == NULL) /* Not present. */ -+ return(0); -+ } -+ -+ /* Mark beginning of line for ^ . */ -+ g.regbol = string; -+ -+ /* Simplest case: anchored match need be tried only once. */ -+ if (prog->reganch) -+ return(regtry(&g, prog, string)); -+ -+ /* Messy cases: unanchored match. */ -+ s = string; -+ if (prog->regstart != '\0') -+ /* We know what char it must start with. */ -+ while ((s = strchr(s, prog->regstart)) != NULL) { -+ if (regtry(&g, prog, s)) -+ return(1); -+ s++; -+ } -+ else -+ /* We don't -- general case. */ -+ do { -+ if (regtry(&g, prog, s)) -+ return(1); -+ } while (*s++ != '\0'); -+ -+ /* Failure. */ -+ return(0); -+} -+ -+/* -+ - regtry - try match at specific point -+ */ -+static int /* 0 failure, 1 success */ -+regtry(struct match_globals *g, regexp *prog, char *string) -+{ -+ register int i; -+ register char **sp; -+ register char **ep; -+ -+ g->reginput = string; -+ g->regstartp = prog->startp; -+ g->regendp = prog->endp; -+ -+ sp = prog->startp; -+ ep = prog->endp; -+ for (i = NSUBEXP; i > 0; i--) { -+ *sp++ = NULL; -+ *ep++ = NULL; -+ } -+ if (regmatch(g, prog->program + 1)) { -+ prog->startp[0] = string; -+ prog->endp[0] = g->reginput; -+ return(1); -+ } else -+ return(0); -+} -+ -+/* -+ - regmatch - main matching routine -+ * -+ * Conceptually the strategy is simple: check to see whether the current -+ * node matches, call self recursively to see whether the rest matches, -+ * and then act accordingly. In practice we make some effort to avoid -+ * recursion, in particular by going through "ordinary" nodes (that don't -+ * need to know whether the rest of the match failed) by a loop instead of -+ * by recursion. -+ */ -+static int /* 0 failure, 1 success */ -+regmatch(struct match_globals *g, char *prog) -+{ -+ register char *scan = prog; /* Current node. */ -+ char *next; /* Next node. */ -+ -+#ifdef DEBUG -+ if (scan != NULL && regnarrate) -+ fprintf(stderr, "%s(\n", regprop(scan)); -+#endif -+ while (scan != NULL) { -+#ifdef DEBUG -+ if (regnarrate) -+ fprintf(stderr, "%s...\n", regprop(scan)); -+#endif -+ next = regnext(g, scan); -+ -+ switch (OP(scan)) { -+ case BOL: -+ if (g->reginput != g->regbol) -+ return(0); -+ break; -+ case EOL: -+ if (*g->reginput != '\0') -+ return(0); -+ break; -+ case ANY: -+ if (*g->reginput == '\0') -+ return(0); -+ g->reginput++; -+ break; -+ case EXACTLY: { -+ register int len; -+ register char *opnd; -+ -+ opnd = OPERAND(scan); -+ /* Inline the first character, for speed. */ -+ if (*opnd != *g->reginput) -+ return(0); -+ len = strlen(opnd); -+ if (len > 1 && strncmp(opnd, g->reginput, len) != 0) -+ return(0); -+ g->reginput += len; -+ } -+ break; -+ case ANYOF: -+ if (*g->reginput == '\0' || strchr(OPERAND(scan), *g->reginput) == NULL) -+ return(0); -+ g->reginput++; -+ break; -+ case ANYBUT: -+ if (*g->reginput == '\0' || strchr(OPERAND(scan), *g->reginput) != NULL) -+ return(0); -+ g->reginput++; -+ break; -+ case NOTHING: -+ case BACK: -+ break; -+ case OPEN+1: -+ case OPEN+2: -+ case OPEN+3: -+ case OPEN+4: -+ case OPEN+5: -+ case OPEN+6: -+ case OPEN+7: -+ case OPEN+8: -+ case OPEN+9: { -+ register int no; -+ register char *save; -+ -+ no = OP(scan) - OPEN; -+ save = g->reginput; -+ -+ if (regmatch(g, next)) { -+ /* -+ * Don't set startp if some later -+ * invocation of the same parentheses -+ * already has. -+ */ -+ if (g->regstartp[no] == NULL) -+ g->regstartp[no] = save; -+ return(1); -+ } else -+ return(0); -+ } -+ break; -+ case CLOSE+1: -+ case CLOSE+2: -+ case CLOSE+3: -+ case CLOSE+4: -+ case CLOSE+5: -+ case CLOSE+6: -+ case CLOSE+7: -+ case CLOSE+8: -+ case CLOSE+9: -+ { -+ register int no; -+ register char *save; -+ -+ no = OP(scan) - CLOSE; -+ save = g->reginput; -+ -+ if (regmatch(g, next)) { -+ /* -+ * Don't set endp if some later -+ * invocation of the same parentheses -+ * already has. -+ */ -+ if (g->regendp[no] == NULL) -+ g->regendp[no] = save; -+ return(1); -+ } else -+ return(0); -+ } -+ break; -+ case BRANCH: { -+ register char *save; -+ -+ if (OP(next) != BRANCH) /* No choice. */ -+ next = OPERAND(scan); /* Avoid recursion. */ -+ else { -+ do { -+ save = g->reginput; -+ if (regmatch(g, OPERAND(scan))) -+ return(1); -+ g->reginput = save; -+ scan = regnext(g, scan); -+ } while (scan != NULL && OP(scan) == BRANCH); -+ return(0); -+ /* NOTREACHED */ -+ } -+ } -+ break; -+ case STAR: -+ case PLUS: { -+ register char nextch; -+ register int no; -+ register char *save; -+ register int min; -+ -+ /* -+ * Lookahead to avoid useless match attempts -+ * when we know what character comes next. -+ */ -+ nextch = '\0'; -+ if (OP(next) == EXACTLY) -+ nextch = *OPERAND(next); -+ min = (OP(scan) == STAR) ? 0 : 1; -+ save = g->reginput; -+ no = regrepeat(g, OPERAND(scan)); -+ while (no >= min) { -+ /* If it could work, try it. */ -+ if (nextch == '\0' || *g->reginput == nextch) -+ if (regmatch(g, next)) -+ return(1); -+ /* Couldn't or didn't -- back up. */ -+ no--; -+ g->reginput = save + no; -+ } -+ return(0); -+ } -+ break; -+ case END: -+ return(1); /* Success! */ -+ break; -+ default: -+ printk("<3>Regexp: memory corruption\n"); -+ return(0); -+ break; -+ } -+ -+ scan = next; -+ } -+ -+ /* -+ * We get here only if there's trouble -- normally "case END" is -+ * the terminating point. -+ */ -+ printk("<3>Regexp: corrupted pointers\n"); -+ return(0); -+} -+ -+/* -+ - regrepeat - repeatedly match something simple, report how many -+ */ -+static int -+regrepeat(struct match_globals *g, char *p) -+{ -+ register int count = 0; -+ register char *scan; -+ register char *opnd; -+ -+ scan = g->reginput; -+ opnd = OPERAND(p); -+ switch (OP(p)) { -+ case ANY: -+ count = strlen(scan); -+ scan += count; -+ break; -+ case EXACTLY: -+ while (*opnd == *scan) { -+ count++; -+ scan++; -+ } -+ break; -+ case ANYOF: -+ while (*scan != '\0' && strchr(opnd, *scan) != NULL) { -+ count++; -+ scan++; -+ } -+ break; -+ case ANYBUT: -+ while (*scan != '\0' && strchr(opnd, *scan) == NULL) { -+ count++; -+ scan++; -+ } -+ break; -+ default: /* Oh dear. Called inappropriately. */ -+ printk("<3>Regexp: internal foulup\n"); -+ count = 0; /* Best compromise. */ -+ break; -+ } -+ g->reginput = scan; -+ -+ return(count); -+} -+ -+/* -+ - regnext - dig the "next" pointer out of a node -+ */ -+static char* -+regnext(struct match_globals *g, char *p) -+{ -+ register int offset; -+ -+ if (p == &g->regdummy) -+ return(NULL); -+ -+ offset = NEXT(p); -+ if (offset == 0) -+ return(NULL); -+ -+ if (OP(p) == BACK) -+ return(p-offset); -+ else -+ return(p+offset); -+} -+ -+#ifdef DEBUG -+ -+STATIC char *regprop(); -+ -+/* -+ - regdump - dump a regexp onto stdout in vaguely comprehensible form -+ */ -+void -+regdump(regexp *r) -+{ -+ register char *s; -+ register char op = EXACTLY; /* Arbitrary non-END op. */ -+ register char *next; -+ /* extern char *strchr(); */ -+ -+ -+ s = r->program + 1; -+ while (op != END) { /* While that wasn't END last time... */ -+ op = OP(s); -+ printf("%2d%s", s-r->program, regprop(s)); /* Where, what. */ -+ next = regnext(s); -+ if (next == NULL) /* Next ptr. */ -+ printf("(0)"); -+ else -+ printf("(%d)", (s-r->program)+(next-s)); -+ s += 3; -+ if (op == ANYOF || op == ANYBUT || op == EXACTLY) { -+ /* Literal string, where present. */ -+ while (*s != '\0') { -+ putchar(*s); -+ s++; -+ } -+ s++; -+ } -+ putchar('\n'); -+ } -+ -+ /* Header fields of interest. */ -+ if (r->regstart != '\0') -+ printf("start `%c' ", r->regstart); -+ if (r->reganch) -+ printf("anchored "); -+ if (r->regmust != NULL) -+ printf("must have \"%s\"", r->regmust); -+ printf("\n"); -+} -+ -+/* -+ - regprop - printable representation of opcode -+ */ -+static char * -+regprop(char *op) -+{ -+#define BUFLEN 50 -+ register char *p; -+ static char buf[BUFLEN]; -+ -+ strcpy(buf, ":"); -+ -+ switch (OP(op)) { -+ case BOL: -+ p = "BOL"; -+ break; -+ case EOL: -+ p = "EOL"; -+ break; -+ case ANY: -+ p = "ANY"; -+ break; -+ case ANYOF: -+ p = "ANYOF"; -+ break; -+ case ANYBUT: -+ p = "ANYBUT"; -+ break; -+ case BRANCH: -+ p = "BRANCH"; -+ break; -+ case EXACTLY: -+ p = "EXACTLY"; -+ break; -+ case NOTHING: -+ p = "NOTHING"; -+ break; -+ case BACK: -+ p = "BACK"; -+ break; -+ case END: -+ p = "END"; -+ break; -+ case OPEN+1: -+ case OPEN+2: -+ case OPEN+3: -+ case OPEN+4: -+ case OPEN+5: -+ case OPEN+6: -+ case OPEN+7: -+ case OPEN+8: -+ case OPEN+9: -+ snprintf(buf+strlen(buf),BUFLEN-strlen(buf), "OPEN%d", OP(op)-OPEN); -+ p = NULL; -+ break; -+ case CLOSE+1: -+ case CLOSE+2: -+ case CLOSE+3: -+ case CLOSE+4: -+ case CLOSE+5: -+ case CLOSE+6: -+ case CLOSE+7: -+ case CLOSE+8: -+ case CLOSE+9: -+ snprintf(buf+strlen(buf),BUFLEN-strlen(buf), "CLOSE%d", OP(op)-CLOSE); -+ p = NULL; -+ break; -+ case STAR: -+ p = "STAR"; -+ break; -+ case PLUS: -+ p = "PLUS"; -+ break; -+ default: -+ printk("<3>Regexp: corrupted opcode\n"); -+ break; -+ } -+ if (p != NULL) -+ strncat(buf, p, BUFLEN-strlen(buf)); -+ return(buf); -+} -+#endif -+ -+ ---- /dev/null -+++ b/net/netfilter/regexp/regexp.h -@@ -0,0 +1,41 @@ -+/* -+ * Definitions etc. for regexp(3) routines. -+ * -+ * Caveat: this is V8 regexp(3) [actually, a reimplementation thereof], -+ * not the System V one. -+ */ -+ -+#ifndef REGEXP_H -+#define REGEXP_H -+ -+ -+/* -+http://www.opensource.apple.com/darwinsource/10.3/expect-1/expect/expect.h , -+which contains a version of this library, says: -+ -+ * -+ * NSUBEXP must be at least 10, and no greater than 117 or the parser -+ * will not work properly. -+ * -+ -+However, it looks rather like this library is limited to 10. If you think -+otherwise, let us know. -+*/ -+ -+#define NSUBEXP 10 -+typedef struct regexp { -+ char *startp[NSUBEXP]; -+ char *endp[NSUBEXP]; -+ char regstart; /* Internal use only. */ -+ char reganch; /* Internal use only. */ -+ char *regmust; /* Internal use only. */ -+ int regmlen; /* Internal use only. */ -+ char program[1]; /* Unwarranted chumminess with compiler. */ -+} regexp; -+ -+regexp * regcomp(char *exp, int *patternsize); -+int regexec(regexp *prog, char *string); -+void regsub(regexp *prog, char *source, char *dest); -+void regerror(char *s); -+ -+#endif ---- /dev/null -+++ b/net/netfilter/regexp/regmagic.h -@@ -0,0 +1,5 @@ -+/* -+ * The first byte of the regexp internal "program" is actually this magic -+ * number; the start node begins in the second byte. -+ */ -+#define MAGIC 0234 ---- /dev/null -+++ b/net/netfilter/regexp/regsub.c -@@ -0,0 +1,95 @@ -+/* -+ * regsub -+ * @(#)regsub.c 1.3 of 2 April 86 -+ * -+ * Copyright (c) 1986 by University of Toronto. -+ * Written by Henry Spencer. Not derived from licensed software. -+ * -+ * Permission is granted to anyone to use this software for any -+ * purpose on any computer system, and to redistribute it freely, -+ * subject to the following restrictions: -+ * -+ * 1. The author is not responsible for the consequences of use of -+ * this software, no matter how awful, even if they arise -+ * from defects in it. -+ * -+ * 2. The origin of this software must not be misrepresented, either -+ * by explicit claim or by omission. -+ * -+ * 3. Altered versions must be plainly marked as such, and must not -+ * be misrepresented as being the original software. -+ * -+ * -+ * This code was modified by Ethan Sommer to work within the kernel -+ * (it now uses kmalloc etc..) -+ * -+ */ -+#include "regexp.h" -+#include "regmagic.h" -+#include <linux/string.h> -+ -+ -+#ifndef CHARBITS -+#define UCHARAT(p) ((int)*(unsigned char *)(p)) -+#else -+#define UCHARAT(p) ((int)*(p)&CHARBITS) -+#endif -+ -+#if 0 -+//void regerror(char * s) -+//{ -+// printk("regexp(3): %s", s); -+// /* NOTREACHED */ -+//} -+#endif -+ -+/* -+ - regsub - perform substitutions after a regexp match -+ */ -+void -+regsub(regexp * prog, char * source, char * dest) -+{ -+ register char *src; -+ register char *dst; -+ register char c; -+ register int no; -+ register int len; -+ -+ /* Not necessary and gcc doesn't like it -MLS */ -+ /*extern char *strncpy();*/ -+ -+ if (prog == NULL || source == NULL || dest == NULL) { -+ regerror("NULL parm to regsub"); -+ return; -+ } -+ if (UCHARAT(prog->program) != MAGIC) { -+ regerror("damaged regexp fed to regsub"); -+ return; -+ } -+ -+ src = source; -+ dst = dest; -+ while ((c = *src++) != '\0') { -+ if (c == '&') -+ no = 0; -+ else if (c == '\\' && '0' <= *src && *src <= '9') -+ no = *src++ - '0'; -+ else -+ no = -1; -+ -+ if (no < 0) { /* Ordinary character. */ -+ if (c == '\\' && (*src == '\\' || *src == '&')) -+ c = *src++; -+ *dst++ = c; -+ } else if (prog->startp[no] != NULL && prog->endp[no] != NULL) { -+ len = prog->endp[no] - prog->startp[no]; -+ (void) strncpy(dst, prog->startp[no], len); -+ dst += len; -+ if (len != 0 && *(dst-1) == '\0') { /* strncpy hit NUL. */ -+ regerror("damaged match string"); -+ return; -+ } -+ } -+ } -+ *dst++ = '\0'; -+} ---- a/net/netfilter/nf_conntrack_core.c -+++ b/net/netfilter/nf_conntrack_core.c -@@ -352,6 +352,14 @@ destroy_conntrack(struct nf_conntrack *n - * too. */ - nf_ct_remove_expectations(ct); - -+ #if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE) -+ if(ct->layer7.app_proto) -+ kfree(ct->layer7.app_proto); -+ if(ct->layer7.app_data) -+ kfree(ct->layer7.app_data); -+ #endif -+ -+ - /* We overload first tuple to link into unconfirmed list. */ - if (!nf_ct_is_confirmed(ct)) { - BUG_ON(list_empty(&ct->tuplehash[IP_CT_DIR_ORIGINAL].list)); ---- a/net/netfilter/nf_conntrack_standalone.c -+++ b/net/netfilter/nf_conntrack_standalone.c -@@ -195,7 +195,12 @@ static int ct_seq_show(struct seq_file * - return -ENOSPC; - #endif - -- if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use))) -+#if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE) -+ if(conntrack->layer7.app_proto) -+ if(seq_printf(s, "l7proto=%s ", conntrack->layer7.app_proto)) -+ return -ENOSPC; -+#endif -+ if (seq_printf(s, "asdfuse=%u\n", atomic_read(&conntrack->ct_general.use))) - return -ENOSPC; - - return 0; ---- a/include/net/netfilter/nf_conntrack.h -+++ b/include/net/netfilter/nf_conntrack.h -@@ -128,6 +128,22 @@ struct nf_conn - u_int32_t secmark; - #endif - -+#if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || \ -+ defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE) -+ struct { -+ /* -+ * e.g. "http". NULL before decision. "unknown" after decision -+ * if no match. -+ */ -+ char *app_proto; -+ /* -+ * application layer data so far. NULL after match decision. -+ */ -+ char *app_data; -+ unsigned int app_data_len; -+ } layer7; -+#endif -+ - /* Storage reserved for other modules: */ - union nf_conntrack_proto proto; - ---- /dev/null -+++ b/include/linux/netfilter/xt_layer7.h -@@ -0,0 +1,13 @@ -+#ifndef _XT_LAYER7_H -+#define _XT_LAYER7_H -+ -+#define MAX_PATTERN_LEN 8192 -+#define MAX_PROTOCOL_LEN 256 -+ -+struct xt_layer7_info { -+ char protocol[MAX_PROTOCOL_LEN]; -+ char pattern[MAX_PATTERN_LEN]; -+ u_int8_t invert; -+}; -+ -+#endif /* _XT_LAYER7_H */ diff --git a/target/linux/generic-2.6/patches-2.6.23/100-netfilter_layer7_2.17.patch b/target/linux/generic-2.6/patches-2.6.23/100-netfilter_layer7_2.17.patch deleted file mode 100644 index eb9e4f7bb..000000000 --- a/target/linux/generic-2.6/patches-2.6.23/100-netfilter_layer7_2.17.patch +++ /dev/null @@ -1,2101 +0,0 @@ ---- a/net/netfilter/Kconfig -+++ b/net/netfilter/Kconfig -@@ -633,6 +633,27 @@ config NETFILTER_XT_MATCH_STATE - - To compile it as a module, choose M here. If unsure, say N. - -+config NETFILTER_XT_MATCH_LAYER7 -+ tristate '"layer7" match support' -+ depends on NETFILTER_XTABLES -+ depends on EXPERIMENTAL && (IP_NF_CONNTRACK || NF_CONNTRACK) -+ depends on NF_CT_ACCT -+ help -+ Say Y if you want to be able to classify connections (and their -+ packets) based on regular expression matching of their application -+ layer data. This is one way to classify applications such as -+ peer-to-peer filesharing systems that do not always use the same -+ port. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ -+config NETFILTER_XT_MATCH_LAYER7_DEBUG -+ bool 'Layer 7 debugging output' -+ depends on NETFILTER_XT_MATCH_LAYER7 -+ help -+ Say Y to get lots of debugging output. -+ -+ - config NETFILTER_XT_MATCH_STATISTIC - tristate '"statistic" match support' - depends on NETFILTER_XTABLES ---- a/net/netfilter/Makefile -+++ b/net/netfilter/Makefile -@@ -71,6 +71,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_QUOTA) + - obj-$(CONFIG_NETFILTER_XT_MATCH_REALM) += xt_realm.o - obj-$(CONFIG_NETFILTER_XT_MATCH_SCTP) += xt_sctp.o - obj-$(CONFIG_NETFILTER_XT_MATCH_STATE) += xt_state.o -+obj-$(CONFIG_NETFILTER_XT_MATCH_LAYER7) += xt_layer7.o - obj-$(CONFIG_NETFILTER_XT_MATCH_STATISTIC) += xt_statistic.o - obj-$(CONFIG_NETFILTER_XT_MATCH_STRING) += xt_string.o - obj-$(CONFIG_NETFILTER_XT_MATCH_TCPMSS) += xt_tcpmss.o ---- /dev/null -+++ b/net/netfilter/xt_layer7.c -@@ -0,0 +1,634 @@ -+/* -+ Kernel module to match application layer (OSI layer 7) data in connections. -+ -+ http://l7-filter.sf.net -+ -+ (C) 2003, 2004, 2005, 2006, 2007 Matthew Strait and Ethan Sommer. -+ -+ This program is free software; you can redistribute it and/or -+ modify it under the terms of the GNU General Public License -+ as published by the Free Software Foundation; either version -+ 2 of the License, or (at your option) any later version. -+ http://www.gnu.org/licenses/gpl.txt -+ -+ Based on ipt_string.c (C) 2000 Emmanuel Roger <winfield@freegates.be>, -+ xt_helper.c (C) 2002 Harald Welte and cls_layer7.c (C) 2003 Matthew Strait, -+ Ethan Sommer, Justin Levandoski. -+*/ -+ -+#include <linux/spinlock.h> -+#include <linux/version.h> -+#include <net/ip.h> -+#include <net/tcp.h> -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/netfilter.h> -+#include <net/netfilter/nf_conntrack.h> -+#include <net/netfilter/nf_conntrack_core.h> -+#include <linux/netfilter/x_tables.h> -+#include <linux/netfilter/xt_layer7.h> -+#include <linux/ctype.h> -+#include <linux/proc_fs.h> -+ -+#include "regexp/regexp.c" -+ -+MODULE_LICENSE("GPL"); -+MODULE_AUTHOR("Matthew Strait <quadong@users.sf.net>, Ethan Sommer <sommere@users.sf.net>"); -+MODULE_DESCRIPTION("iptables application layer match module"); -+MODULE_ALIAS("ipt_layer7"); -+MODULE_VERSION("2.17"); -+ -+static int maxdatalen = 2048; // this is the default -+module_param(maxdatalen, int, 0444); -+MODULE_PARM_DESC(maxdatalen, "maximum bytes of data looked at by l7-filter"); -+#ifdef CONFIG_NETFILTER_XT_MATCH_LAYER7_DEBUG -+ #define DPRINTK(format,args...) printk(format,##args) -+#else -+ #define DPRINTK(format,args...) -+#endif -+ -+#define TOTAL_PACKETS master_conntrack->counters[IP_CT_DIR_ORIGINAL].packets + \ -+ master_conntrack->counters[IP_CT_DIR_REPLY].packets -+ -+/* Number of packets whose data we look at. -+This can be modified through /proc/net/layer7_numpackets */ -+static int num_packets = 10; -+ -+static struct pattern_cache { -+ char * regex_string; -+ regexp * pattern; -+ struct pattern_cache * next; -+} * first_pattern_cache = NULL; -+ -+DEFINE_SPINLOCK(l7_lock); -+ -+#ifdef CONFIG_IP_NF_MATCH_LAYER7_DEBUG -+/* Converts an unfriendly string into a friendly one by -+replacing unprintables with periods and all whitespace with " ". */ -+static char * friendly_print(unsigned char * s) -+{ -+ char * f = kmalloc(strlen(s) + 1, GFP_ATOMIC); -+ int i; -+ -+ if(!f) { -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in " -+ "friendly_print, bailing.\n"); -+ return NULL; -+ } -+ -+ for(i = 0; i < strlen(s); i++){ -+ if(isprint(s[i]) && s[i] < 128) f[i] = s[i]; -+ else if(isspace(s[i])) f[i] = ' '; -+ else f[i] = '.'; -+ } -+ f[i] = '\0'; -+ return f; -+} -+ -+static char dec2hex(int i) -+{ -+ switch (i) { -+ case 0 ... 9: -+ return (i + '0'); -+ break; -+ case 10 ... 15: -+ return (i - 10 + 'a'); -+ break; -+ default: -+ if (net_ratelimit()) -+ printk("layer7: Problem in dec2hex\n"); -+ return '\0'; -+ } -+} -+ -+static char * hex_print(unsigned char * s) -+{ -+ char * g = kmalloc(strlen(s)*3 + 1, GFP_ATOMIC); -+ int i; -+ -+ if(!g) { -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in hex_print, " -+ "bailing.\n"); -+ return NULL; -+ } -+ -+ for(i = 0; i < strlen(s); i++) { -+ g[i*3 ] = dec2hex(s[i]/16); -+ g[i*3 + 1] = dec2hex(s[i]%16); -+ g[i*3 + 2] = ' '; -+ } -+ g[i*3] = '\0'; -+ -+ return g; -+} -+#endif // DEBUG -+ -+/* Use instead of regcomp. As we expect to be seeing the same regexps over and -+over again, it make sense to cache the results. */ -+static regexp * compile_and_cache(const char * regex_string, -+ const char * protocol) -+{ -+ struct pattern_cache * node = first_pattern_cache; -+ struct pattern_cache * last_pattern_cache = first_pattern_cache; -+ struct pattern_cache * tmp; -+ unsigned int len; -+ -+ while (node != NULL) { -+ if (!strcmp(node->regex_string, regex_string)) -+ return node->pattern; -+ -+ last_pattern_cache = node;/* points at the last non-NULL node */ -+ node = node->next; -+ } -+ -+ /* If we reach the end of the list, then we have not yet cached -+ the pattern for this regex. Let's do that now. -+ Be paranoid about running out of memory to avoid list corruption. */ -+ tmp = kmalloc(sizeof(struct pattern_cache), GFP_ATOMIC); -+ -+ if(!tmp) { -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in " -+ "compile_and_cache, bailing.\n"); -+ return NULL; -+ } -+ -+ tmp->regex_string = kmalloc(strlen(regex_string) + 1, GFP_ATOMIC); -+ tmp->pattern = kmalloc(sizeof(struct regexp), GFP_ATOMIC); -+ tmp->next = NULL; -+ -+ if(!tmp->regex_string || !tmp->pattern) { -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in " -+ "compile_and_cache, bailing.\n"); -+ kfree(tmp->regex_string); -+ kfree(tmp->pattern); -+ kfree(tmp); -+ return NULL; -+ } -+ -+ /* Ok. The new node is all ready now. */ -+ node = tmp; -+ -+ if(first_pattern_cache == NULL) /* list is empty */ -+ first_pattern_cache = node; /* make node the beginning */ -+ else -+ last_pattern_cache->next = node; /* attach node to the end */ -+ -+ /* copy the string and compile the regex */ -+ len = strlen(regex_string); -+ DPRINTK("About to compile this: \"%s\"\n", regex_string); -+ node->pattern = regcomp((char *)regex_string, &len); -+ if ( !node->pattern ) { -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: Error compiling regexp " -+ "\"%s\" (%s)\n", -+ regex_string, protocol); -+ /* pattern is now cached as NULL, so we won't try again. */ -+ } -+ -+ strcpy(node->regex_string, regex_string); -+ return node->pattern; -+} -+ -+static int can_handle(const struct sk_buff *skb) -+{ -+ if(!ip_hdr(skb)) /* not IP */ -+ return 0; -+ if(ip_hdr(skb)->protocol != IPPROTO_TCP && -+ ip_hdr(skb)->protocol != IPPROTO_UDP && -+ ip_hdr(skb)->protocol != IPPROTO_ICMP) -+ return 0; -+ return 1; -+} -+ -+/* Returns offset the into the skb->data that the application data starts */ -+static int app_data_offset(const struct sk_buff *skb) -+{ -+ /* In case we are ported somewhere (ebtables?) where ip_hdr(skb) -+ isn't set, this can be gotten from 4*(skb->data[0] & 0x0f) as well. */ -+ int ip_hl = 4*ip_hdr(skb)->ihl; -+ -+ if( ip_hdr(skb)->protocol == IPPROTO_TCP ) { -+ /* 12 == offset into TCP header for the header length field. -+ Can't get this with skb->h.th->doff because the tcphdr -+ struct doesn't get set when routing (this is confirmed to be -+ true in Netfilter as well as QoS.) */ -+ int tcp_hl = 4*(skb->data[ip_hl + 12] >> 4); -+ -+ return ip_hl + tcp_hl; -+ } else if( ip_hdr(skb)->protocol == IPPROTO_UDP ) { -+ return ip_hl + 8; /* UDP header is always 8 bytes */ -+ } else if( ip_hdr(skb)->protocol == IPPROTO_ICMP ) { -+ return ip_hl + 8; /* ICMP header is 8 bytes */ -+ } else { -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: tried to handle unknown " -+ "protocol!\n"); -+ return ip_hl + 8; /* something reasonable */ -+ } -+} -+ -+/* handles whether there's a match when we aren't appending data anymore */ -+static int match_no_append(struct nf_conn * conntrack, -+ struct nf_conn * master_conntrack, -+ enum ip_conntrack_info ctinfo, -+ enum ip_conntrack_info master_ctinfo, -+ const struct xt_layer7_info * info) -+{ -+ /* If we're in here, throw the app data away */ -+ if(master_conntrack->layer7.app_data != NULL) { -+ -+ #ifdef CONFIG_IP_NF_MATCH_LAYER7_DEBUG -+ if(!master_conntrack->layer7.app_proto) { -+ char * f = -+ friendly_print(master_conntrack->layer7.app_data); -+ char * g = -+ hex_print(master_conntrack->layer7.app_data); -+ DPRINTK("\nl7-filter gave up after %d bytes " -+ "(%d packets):\n%s\n", -+ strlen(f), TOTAL_PACKETS, f); -+ kfree(f); -+ DPRINTK("In hex: %s\n", g); -+ kfree(g); -+ } -+ #endif -+ -+ kfree(master_conntrack->layer7.app_data); -+ master_conntrack->layer7.app_data = NULL; /* don't free again */ -+ } -+ -+ if(master_conntrack->layer7.app_proto){ -+ /* Here child connections set their .app_proto (for /proc) */ -+ if(!conntrack->layer7.app_proto) { -+ conntrack->layer7.app_proto = -+ kmalloc(strlen(master_conntrack->layer7.app_proto)+1, -+ GFP_ATOMIC); -+ if(!conntrack->layer7.app_proto){ -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory " -+ "in match_no_append, " -+ "bailing.\n"); -+ return 1; -+ } -+ strcpy(conntrack->layer7.app_proto, -+ master_conntrack->layer7.app_proto); -+ } -+ -+ return (!strcmp(master_conntrack->layer7.app_proto, -+ info->protocol)); -+ } -+ else { -+ /* If not classified, set to "unknown" to distinguish from -+ connections that are still being tested. */ -+ master_conntrack->layer7.app_proto = -+ kmalloc(strlen("unknown")+1, GFP_ATOMIC); -+ if(!master_conntrack->layer7.app_proto){ -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in " -+ "match_no_append, bailing.\n"); -+ return 1; -+ } -+ strcpy(master_conntrack->layer7.app_proto, "unknown"); -+ return 0; -+ } -+} -+ -+/* add the new app data to the conntrack. Return number of bytes added. */ -+static int add_data(struct nf_conn * master_conntrack, -+ char * app_data, int appdatalen) -+{ -+ int length = 0, i; -+ int oldlength = master_conntrack->layer7.app_data_len; -+ -+ /* This is a fix for a race condition by Deti Fliegl. However, I'm not -+ clear on whether the race condition exists or whether this really -+ fixes it. I might just be being dense... Anyway, if it's not really -+ a fix, all it does is waste a very small amount of time. */ -+ if(!master_conntrack->layer7.app_data) return 0; -+ -+ /* Strip nulls. Make everything lower case (our regex lib doesn't -+ do case insensitivity). Add it to the end of the current data. */ -+ for(i = 0; i < maxdatalen-oldlength-1 && -+ i < appdatalen; i++) { -+ if(app_data[i] != '\0') { -+ /* the kernel version of tolower mungs 'upper ascii' */ -+ master_conntrack->layer7.app_data[length+oldlength] = -+ isascii(app_data[i])? -+ tolower(app_data[i]) : app_data[i]; -+ length++; -+ } -+ } -+ -+ master_conntrack->layer7.app_data[length+oldlength] = '\0'; -+ master_conntrack->layer7.app_data_len = length + oldlength; -+ -+ return length; -+} -+ -+/* taken from drivers/video/modedb.c */ -+static int my_atoi(const char *s) -+{ -+ int val = 0; -+ -+ for (;; s++) { -+ switch (*s) { -+ case '0'...'9': -+ val = 10*val+(*s-'0'); -+ break; -+ default: -+ return val; -+ } -+ } -+} -+ -+/* write out num_packets to userland. */ -+static int layer7_read_proc(char* page, char ** start, off_t off, int count, -+ int* eof, void * data) -+{ -+ if(num_packets > 99 && net_ratelimit()) -+ printk(KERN_ERR "layer7: NOT REACHED. num_packets too big\n"); -+ -+ page[0] = num_packets/10 + '0'; -+ page[1] = num_packets%10 + '0'; -+ page[2] = '\n'; -+ page[3] = '\0'; -+ -+ *eof=1; -+ -+ return 3; -+} -+ -+/* Read in num_packets from userland */ -+static int layer7_write_proc(struct file* file, const char* buffer, -+ unsigned long count, void *data) -+{ -+ char * foo = kmalloc(count, GFP_ATOMIC); -+ -+ if(!foo){ -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory, bailing. " -+ "num_packets unchanged.\n"); -+ return count; -+ } -+ -+ if(copy_from_user(foo, buffer, count)) { -+ return -EFAULT; -+ } -+ -+ -+ num_packets = my_atoi(foo); -+ kfree (foo); -+ -+ /* This has an arbitrary limit to make the math easier. I'm lazy. -+ But anyway, 99 is a LOT! If you want more, you're doing it wrong! */ -+ if(num_packets > 99) { -+ printk(KERN_WARNING "layer7: num_packets can't be > 99.\n"); -+ num_packets = 99; -+ } else if(num_packets < 1) { -+ printk(KERN_WARNING "layer7: num_packets can't be < 1.\n"); -+ num_packets = 1; -+ } -+ -+ return count; -+} -+ -+static bool -+match(const struct sk_buff *skbin, -+ const struct net_device *in, -+ const struct net_device *out, -+ const struct xt_match *match, -+ const void *matchinfo, -+ int offset, -+ unsigned int protoff, -+ bool *hotdrop) -+{ -+ /* sidestep const without getting a compiler warning... */ -+ struct sk_buff * skb = (struct sk_buff *)skbin; -+ -+ const struct xt_layer7_info * info = matchinfo; -+ enum ip_conntrack_info master_ctinfo, ctinfo; -+ struct nf_conn *master_conntrack, *conntrack; -+ unsigned char * app_data; -+ unsigned int pattern_result, appdatalen; -+ regexp * comppattern; -+ -+ /* Be paranoid/incompetent - lock the entire match function. */ -+ spin_lock_bh(&l7_lock); -+ -+ if(!can_handle(skb)){ -+ DPRINTK("layer7: This is some protocol I can't handle.\n"); -+ spin_unlock_bh(&l7_lock); -+ return info->invert; -+ } -+ -+ /* Treat parent & all its children together as one connection, except -+ for the purpose of setting conntrack->layer7.app_proto in the actual -+ connection. This makes /proc/net/ip_conntrack more satisfying. */ -+ if(!(conntrack = nf_ct_get(skb, &ctinfo)) || -+ !(master_conntrack=nf_ct_get(skb,&master_ctinfo))){ -+ DPRINTK("layer7: couldn't get conntrack.\n"); -+ spin_unlock_bh(&l7_lock); -+ return info->invert; -+ } -+ -+ /* Try to get a master conntrack (and its master etc) for FTP, etc. */ -+ while (master_ct(master_conntrack) != NULL) -+ master_conntrack = master_ct(master_conntrack); -+ -+ /* if we've classified it or seen too many packets */ -+ if(TOTAL_PACKETS > num_packets || -+ master_conntrack->layer7.app_proto) { -+ -+ pattern_result = match_no_append(conntrack, master_conntrack, -+ ctinfo, master_ctinfo, info); -+ -+ /* skb->cb[0] == seen. Don't do things twice if there are -+ multiple l7 rules. I'm not sure that using cb for this purpose -+ is correct, even though it says "put your private variables -+ there". But it doesn't look like it is being used for anything -+ else in the skbs that make it here. */ -+ skb->cb[0] = 1; /* marking it seen here's probably irrelevant */ -+ -+ spin_unlock_bh(&l7_lock); -+ return (pattern_result ^ info->invert); -+ } -+ -+ if(skb_is_nonlinear(skb)){ -+ if(skb_linearize(skb) != 0){ -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: failed to linearize " -+ "packet, bailing.\n"); -+ spin_unlock_bh(&l7_lock); -+ return info->invert; -+ } -+ } -+ -+ /* now that the skb is linearized, it's safe to set these. */ -+ app_data = skb->data + app_data_offset(skb); -+ appdatalen = skb_tail_pointer(skb) - app_data; -+ -+ /* the return value gets checked later, when we're ready to use it */ -+ comppattern = compile_and_cache(info->pattern, info->protocol); -+ -+ /* On the first packet of a connection, allocate space for app data */ -+ if(TOTAL_PACKETS == 1 && !skb->cb[0] && -+ !master_conntrack->layer7.app_data){ -+ master_conntrack->layer7.app_data = -+ kmalloc(maxdatalen, GFP_ATOMIC); -+ if(!master_conntrack->layer7.app_data){ -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in " -+ "match, bailing.\n"); -+ spin_unlock_bh(&l7_lock); -+ return info->invert; -+ } -+ -+ master_conntrack->layer7.app_data[0] = '\0'; -+ } -+ -+ /* Can be here, but unallocated, if numpackets is increased near -+ the beginning of a connection */ -+ if(master_conntrack->layer7.app_data == NULL){ -+ spin_unlock_bh(&l7_lock); -+ return (info->invert); /* unmatched */ -+ } -+ -+ if(!skb->cb[0]){ -+ int newbytes; -+ newbytes = add_data(master_conntrack, app_data, appdatalen); -+ -+ if(newbytes == 0) { /* didn't add any data */ -+ skb->cb[0] = 1; -+ /* Didn't match before, not going to match now */ -+ spin_unlock_bh(&l7_lock); -+ return info->invert; -+ } -+ } -+ -+ /* If looking for "unknown", then never match. "Unknown" means that -+ we've given up; we're still trying with these packets. */ -+ if(!strcmp(info->protocol, "unknown")) { -+ pattern_result = 0; -+ /* If looking for "unset", then always match. "Unset" means that we -+ haven't yet classified the connection. */ -+ } else if(!strcmp(info->protocol, "unset")) { -+ pattern_result = 2; -+ DPRINTK("layer7: matched unset: not yet classified " -+ "(%d/%d packets)\n", TOTAL_PACKETS, num_packets); -+ /* If the regexp failed to compile, don't bother running it */ -+ } else if(comppattern && -+ regexec(comppattern, master_conntrack->layer7.app_data)){ -+ DPRINTK("layer7: matched %s\n", info->protocol); -+ pattern_result = 1; -+ } else pattern_result = 0; -+ -+ if(pattern_result == 1) { -+ master_conntrack->layer7.app_proto = -+ kmalloc(strlen(info->protocol)+1, GFP_ATOMIC); -+ if(!master_conntrack->layer7.app_proto){ -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in " -+ "match, bailing.\n"); -+ spin_unlock_bh(&l7_lock); -+ return (pattern_result ^ info->invert); -+ } -+ strcpy(master_conntrack->layer7.app_proto, info->protocol); -+ } else if(pattern_result > 1) { /* cleanup from "unset" */ -+ pattern_result = 1; -+ } -+ -+ /* mark the packet seen */ -+ skb->cb[0] = 1; -+ -+ spin_unlock_bh(&l7_lock); -+ return (pattern_result ^ info->invert); -+} -+ -+static bool check(const char *tablename, -+ const void *inf, -+ const struct xt_match *match, -+ void *matchinfo, -+ unsigned int hook_mask) -+ -+{ -+ // load nf_conntrack_ipv4 -+ if (nf_ct_l3proto_try_module_get(match->family) < 0) { -+ printk(KERN_WARNING "can't load conntrack support for " -+ "proto=%d\n", match->family); -+ return false; -+ } -+ return true; -+} -+ -+static void -+destroy(const struct xt_match *match, void *matchinfo) -+{ -+ nf_ct_l3proto_module_put(match->family); -+} -+ -+static struct xt_match xt_layer7_match[] = { -+{ -+ .name = "layer7", -+ .family = AF_INET, -+ .checkentry = check, -+ .match = match, -+ .destroy = destroy, -+ .matchsize = sizeof(struct xt_layer7_info), -+ .me = THIS_MODULE -+} -+}; -+ -+static void layer7_cleanup_proc(void) -+{ -+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) -+ remove_proc_entry("layer7_numpackets", proc_net); -+#else -+ remove_proc_entry("layer7_numpackets", init_net.proc_net); -+#endif -+} -+ -+/* register the proc file */ -+static void layer7_init_proc(void) -+{ -+ struct proc_dir_entry* entry; -+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) -+ entry = create_proc_entry("layer7_numpackets", 0644, proc_net); -+#else -+ entry = create_proc_entry("layer7_numpackets", 0644, init_net.proc_net); -+#endif -+ entry->read_proc = layer7_read_proc; -+ entry->write_proc = layer7_write_proc; -+} -+ -+static int __init xt_layer7_init(void) -+{ -+ need_conntrack(); -+ -+ layer7_init_proc(); -+ if(maxdatalen < 1) { -+ printk(KERN_WARNING "layer7: maxdatalen can't be < 1, " -+ "using 1\n"); -+ maxdatalen = 1; -+ } -+ /* This is not a hard limit. It's just here to prevent people from -+ bringing their slow machines to a grinding halt. */ -+ else if(maxdatalen > 65536) { -+ printk(KERN_WARNING "layer7: maxdatalen can't be > 65536, " -+ "using 65536\n"); -+ maxdatalen = 65536; -+ } -+ return xt_register_matches(xt_layer7_match, -+ ARRAY_SIZE(xt_layer7_match)); -+} -+ -+static void __exit xt_layer7_fini(void) -+{ -+ layer7_cleanup_proc(); -+ xt_unregister_matches(xt_layer7_match, ARRAY_SIZE(xt_layer7_match)); -+} -+ -+module_init(xt_layer7_init); -+module_exit(xt_layer7_fini); ---- /dev/null -+++ b/net/netfilter/regexp/regexp.c -@@ -0,0 +1,1197 @@ -+/* -+ * regcomp and regexec -- regsub and regerror are elsewhere -+ * @(#)regexp.c 1.3 of 18 April 87 -+ * -+ * Copyright (c) 1986 by University of Toronto. -+ * Written by Henry Spencer. Not derived from licensed software. -+ * -+ * Permission is granted to anyone to use this software for any -+ * purpose on any computer system, and to redistribute it freely, -+ * subject to the following restrictions: -+ * -+ * 1. The author is not responsible for the consequences of use of -+ * this software, no matter how awful, even if they arise -+ * from defects in it. -+ * -+ * 2. The origin of this software must not be misrepresented, either -+ * by explicit claim or by omission. -+ * -+ * 3. Altered versions must be plainly marked as such, and must not -+ * be misrepresented as being the original software. -+ * -+ * Beware that some of this code is subtly aware of the way operator -+ * precedence is structured in regular expressions. Serious changes in -+ * regular-expression syntax might require a total rethink. -+ * -+ * This code was modified by Ethan Sommer to work within the kernel -+ * (it now uses kmalloc etc..) -+ * -+ * Modified slightly by Matthew Strait to use more modern C. -+ */ -+ -+#include "regexp.h" -+#include "regmagic.h" -+ -+/* added by ethan and matt. Lets it work in both kernel and user space. -+(So iptables can use it, for instance.) Yea, it goes both ways... */ -+#if __KERNEL__ -+ #define malloc(foo) kmalloc(foo,GFP_ATOMIC) -+#else -+ #define printk(format,args...) printf(format,##args) -+#endif -+ -+void regerror(char * s) -+{ -+ printk("<3>Regexp: %s\n", s); -+ /* NOTREACHED */ -+} -+ -+/* -+ * The "internal use only" fields in regexp.h are present to pass info from -+ * compile to execute that permits the execute phase to run lots faster on -+ * simple cases. They are: -+ * -+ * regstart char that must begin a match; '\0' if none obvious -+ * reganch is the match anchored (at beginning-of-line only)? -+ * regmust string (pointer into program) that match must include, or NULL -+ * regmlen length of regmust string -+ * -+ * Regstart and reganch permit very fast decisions on suitable starting points -+ * for a match, cutting down the work a lot. Regmust permits fast rejection -+ * of lines that cannot possibly match. The regmust tests are costly enough -+ * that regcomp() supplies a regmust only if the r.e. contains something -+ * potentially expensive (at present, the only such thing detected is * or + -+ * at the start of the r.e., which can involve a lot of backup). Regmlen is -+ * supplied because the test in regexec() needs it and regcomp() is computing -+ * it anyway. -+ */ -+ -+/* -+ * Structure for regexp "program". This is essentially a linear encoding -+ * of a nondeterministic finite-state machine (aka syntax charts or -+ * "railroad normal form" in parsing technology). Each node is an opcode -+ * plus a "next" pointer, possibly plus an operand. "Next" pointers of -+ * all nodes except BRANCH implement concatenation; a "next" pointer with -+ * a BRANCH on both ends of it is connecting two alternatives. (Here we -+ * have one of the subtle syntax dependencies: an individual BRANCH (as -+ * opposed to a collection of them) is never concatenated with anything -+ * because of operator precedence.) The operand of some types of node is -+ * a literal string; for others, it is a node leading into a sub-FSM. In -+ * particular, the operand of a BRANCH node is the first node of the branch. -+ * (NB this is *not* a tree structure: the tail of the branch connects -+ * to the thing following the set of BRANCHes.) The opcodes are: -+ */ -+ -+/* definition number opnd? meaning */ -+#define END 0 /* no End of program. */ -+#define BOL 1 /* no Match "" at beginning of line. */ -+#define EOL 2 /* no Match "" at end of line. */ -+#define ANY 3 /* no Match any one character. */ -+#define ANYOF 4 /* str Match any character in this string. */ -+#define ANYBUT 5 /* str Match any character not in this string. */ -+#define BRANCH 6 /* node Match this alternative, or the next... */ -+#define BACK 7 /* no Match "", "next" ptr points backward. */ -+#define EXACTLY 8 /* str Match this string. */ -+#define NOTHING 9 /* no Match empty string. */ -+#define STAR 10 /* node Match this (simple) thing 0 or more times. */ -+#define PLUS 11 /* node Match this (simple) thing 1 or more times. */ -+#define OPEN 20 /* no Mark this point in input as start of #n. */ -+ /* OPEN+1 is number 1, etc. */ -+#define CLOSE 30 /* no Analogous to OPEN. */ -+ -+/* -+ * Opcode notes: -+ * -+ * BRANCH The set of branches constituting a single choice are hooked -+ * together with their "next" pointers, since precedence prevents -+ * anything being concatenated to any individual branch. The -+ * "next" pointer of the last BRANCH in a choice points to the -+ * thing following the whole choice. This is also where the -+ * final "next" pointer of each individual branch points; each -+ * branch starts with the operand node of a BRANCH node. -+ * -+ * BACK Normal "next" pointers all implicitly point forward; BACK -+ * exists to make loop structures possible. -+ * -+ * STAR,PLUS '?', and complex '*' and '+', are implemented as circular -+ * BRANCH structures using BACK. Simple cases (one character -+ * per match) are implemented with STAR and PLUS for speed -+ * and to minimize recursive plunges. -+ * -+ * OPEN,CLOSE ...are numbered at compile time. -+ */ -+ -+/* -+ * A node is one char of opcode followed by two chars of "next" pointer. -+ * "Next" pointers are stored as two 8-bit pieces, high order first. The -+ * value is a positive offset from the opcode of the node containing it. -+ * An operand, if any, simply follows the node. (Note that much of the -+ * code generation knows about this implicit relationship.) -+ * -+ * Using two bytes for the "next" pointer is vast overkill for most things, -+ * but allows patterns to get big without disasters. -+ */ -+#define OP(p) (*(p)) -+#define NEXT(p) (((*((p)+1)&0377)<<8) + (*((p)+2)&0377)) -+#define OPERAND(p) ((p) + 3) -+ -+/* -+ * See regmagic.h for one further detail of program structure. -+ */ -+ -+ -+/* -+ * Utility definitions. -+ */ -+#ifndef CHARBITS -+#define UCHARAT(p) ((int)*(unsigned char *)(p)) -+#else -+#define UCHARAT(p) ((int)*(p)&CHARBITS) -+#endif -+ -+#define FAIL(m) { regerror(m); return(NULL); } -+#define ISMULT(c) ((c) == '*' || (c) == '+' || (c) == '?') -+#define META "^$.[()|?+*\\" -+ -+/* -+ * Flags to be passed up and down. -+ */ -+#define HASWIDTH 01 /* Known never to match null string. */ -+#define SIMPLE 02 /* Simple enough to be STAR/PLUS operand. */ -+#define SPSTART 04 /* Starts with * or +. */ -+#define WORST 0 /* Worst case. */ -+ -+/* -+ * Global work variables for regcomp(). -+ */ -+struct match_globals { -+char *reginput; /* String-input pointer. */ -+char *regbol; /* Beginning of input, for ^ check. */ -+char **regstartp; /* Pointer to startp array. */ -+char **regendp; /* Ditto for endp. */ -+char *regparse; /* Input-scan pointer. */ -+int regnpar; /* () count. */ -+char regdummy; -+char *regcode; /* Code-emit pointer; ®dummy = don't. */ -+long regsize; /* Code size. */ -+}; -+ -+/* -+ * Forward declarations for regcomp()'s friends. -+ */ -+#ifndef STATIC -+#define STATIC static -+#endif -+STATIC char *reg(struct match_globals *g, int paren,int *flagp); -+STATIC char *regbranch(struct match_globals *g, int *flagp); -+STATIC char *regpiece(struct match_globals *g, int *flagp); -+STATIC char *regatom(struct match_globals *g, int *flagp); -+STATIC char *regnode(struct match_globals *g, char op); -+STATIC char *regnext(struct match_globals *g, char *p); -+STATIC void regc(struct match_globals *g, char b); -+STATIC void reginsert(struct match_globals *g, char op, char *opnd); -+STATIC void regtail(struct match_globals *g, char *p, char *val); -+STATIC void regoptail(struct match_globals *g, char *p, char *val); -+ -+ -+__kernel_size_t my_strcspn(const char *s1,const char *s2) -+{ -+ char *scan1; -+ char *scan2; -+ int count; -+ -+ count = 0; -+ for (scan1 = (char *)s1; *scan1 != '\0'; scan1++) { -+ for (scan2 = (char *)s2; *scan2 != '\0';) /* ++ moved down. */ -+ if (*scan1 == *scan2++) -+ return(count); -+ count++; -+ } -+ return(count); -+} -+ -+/* -+ - regcomp - compile a regular expression into internal code -+ * -+ * We can't allocate space until we know how big the compiled form will be, -+ * but we can't compile it (and thus know how big it is) until we've got a -+ * place to put the code. So we cheat: we compile it twice, once with code -+ * generation turned off and size counting turned on, and once "for real". -+ * This also means that we don't allocate space until we are sure that the -+ * thing really will compile successfully, and we never have to move the -+ * code and thus invalidate pointers into it. (Note that it has to be in -+ * one piece because free() must be able to free it all.) -+ * -+ * Beware that the optimization-preparation code in here knows about some -+ * of the structure of the compiled regexp. -+ */ -+regexp * -+regcomp(char *exp,int *patternsize) -+{ -+ register regexp *r; -+ register char *scan; -+ register char *longest; -+ register int len; -+ int flags; -+ struct match_globals g; -+ -+ /* commented out by ethan -+ extern char *malloc(); -+ */ -+ -+ if (exp == NULL) -+ FAIL("NULL argument"); -+ -+ /* First pass: determine size, legality. */ -+ g.regparse = exp; -+ g.regnpar = 1; -+ g.regsize = 0L; -+ g.regcode = &g.regdummy; -+ regc(&g, MAGIC); -+ if (reg(&g, 0, &flags) == NULL) -+ return(NULL); -+ -+ /* Small enough for pointer-storage convention? */ -+ if (g.regsize >= 32767L) /* Probably could be 65535L. */ -+ FAIL("regexp too big"); -+ -+ /* Allocate space. */ -+ *patternsize=sizeof(regexp) + (unsigned)g.regsize; -+ r = (regexp *)malloc(sizeof(regexp) + (unsigned)g.regsize); -+ if (r == NULL) -+ FAIL("out of space"); -+ -+ /* Second pass: emit code. */ -+ g.regparse = exp; -+ g.regnpar = 1; -+ g.regcode = r->program; -+ regc(&g, MAGIC); -+ if (reg(&g, 0, &flags) == NULL) -+ return(NULL); -+ -+ /* Dig out information for optimizations. */ -+ r->regstart = '\0'; /* Worst-case defaults. */ -+ r->reganch = 0; -+ r->regmust = NULL; -+ r->regmlen = 0; -+ scan = r->program+1; /* First BRANCH. */ -+ if (OP(regnext(&g, scan)) == END) { /* Only one top-level choice. */ -+ scan = OPERAND(scan); -+ -+ /* Starting-point info. */ -+ if (OP(scan) == EXACTLY) -+ r->regstart = *OPERAND(scan); -+ else if (OP(scan) == BOL) -+ r->reganch++; -+ -+ /* -+ * If there's something expensive in the r.e., find the -+ * longest literal string that must appear and make it the -+ * regmust. Resolve ties in favor of later strings, since -+ * the regstart check works with the beginning of the r.e. -+ * and avoiding duplication strengthens checking. Not a -+ * strong reason, but sufficient in the absence of others. -+ */ -+ if (flags&SPSTART) { -+ longest = NULL; -+ len = 0; -+ for (; scan != NULL; scan = regnext(&g, scan)) -+ if (OP(scan) == EXACTLY && strlen(OPERAND(scan)) >= len) { -+ longest = OPERAND(scan); -+ len = strlen(OPERAND(scan)); -+ } -+ r->regmust = longest; -+ r->regmlen = len; -+ } -+ } -+ -+ return(r); -+} -+ -+/* -+ - reg - regular expression, i.e. main body or parenthesized thing -+ * -+ * Caller must absorb opening parenthesis. -+ * -+ * Combining parenthesis handling with the base level of regular expression -+ * is a trifle forced, but the need to tie the tails of the branches to what -+ * follows makes it hard to avoid. -+ */ -+static char * -+reg(struct match_globals *g, int paren, int *flagp /* Parenthesized? */ ) -+{ -+ register char *ret; -+ register char *br; -+ register char *ender; -+ register int parno = 0; /* 0 makes gcc happy */ -+ int flags; -+ -+ *flagp = HASWIDTH; /* Tentatively. */ -+ -+ /* Make an OPEN node, if parenthesized. */ -+ if (paren) { -+ if (g->regnpar >= NSUBEXP) -+ FAIL("too many ()"); -+ parno = g->regnpar; -+ g->regnpar++; -+ ret = regnode(g, OPEN+parno); -+ } else -+ ret = NULL; -+ -+ /* Pick up the branches, linking them together. */ -+ br = regbranch(g, &flags); -+ if (br == NULL) -+ return(NULL); -+ if (ret != NULL) -+ regtail(g, ret, br); /* OPEN -> first. */ -+ else -+ ret = br; -+ if (!(flags&HASWIDTH)) -+ *flagp &= ~HASWIDTH; -+ *flagp |= flags&SPSTART; -+ while (*g->regparse == '|') { -+ g->regparse++; -+ br = regbranch(g, &flags); -+ if (br == NULL) -+ return(NULL); -+ regtail(g, ret, br); /* BRANCH -> BRANCH. */ -+ if (!(flags&HASWIDTH)) -+ *flagp &= ~HASWIDTH; -+ *flagp |= flags&SPSTART; -+ } -+ -+ /* Make a closing node, and hook it on the end. */ -+ ender = regnode(g, (paren) ? CLOSE+parno : END); -+ regtail(g, ret, ender); -+ -+ /* Hook the tails of the branches to the closing node. */ -+ for (br = ret; br != NULL; br = regnext(g, br)) -+ regoptail(g, br, ender); -+ -+ /* Check for proper termination. */ -+ if (paren && *g->regparse++ != ')') { -+ FAIL("unmatched ()"); -+ } else if (!paren && *g->regparse != '\0') { -+ if (*g->regparse == ')') { -+ FAIL("unmatched ()"); -+ } else -+ FAIL("junk on end"); /* "Can't happen". */ -+ /* NOTREACHED */ -+ } -+ -+ return(ret); -+} -+ -+/* -+ - regbranch - one alternative of an | operator -+ * -+ * Implements the concatenation operator. -+ */ -+static char * -+regbranch(struct match_globals *g, int *flagp) -+{ -+ register char *ret; -+ register char *chain; -+ register char *latest; -+ int flags; -+ -+ *flagp = WORST; /* Tentatively. */ -+ -+ ret = regnode(g, BRANCH); -+ chain = NULL; -+ while (*g->regparse != '\0' && *g->regparse != '|' && *g->regparse != ')') { -+ latest = regpiece(g, &flags); -+ if (latest == NULL) -+ return(NULL); -+ *flagp |= flags&HASWIDTH; -+ if (chain == NULL) /* First piece. */ -+ *flagp |= flags&SPSTART; -+ else -+ regtail(g, chain, latest); -+ chain = latest; -+ } -+ if (chain == NULL) /* Loop ran zero times. */ -+ (void) regnode(g, NOTHING); -+ -+ return(ret); -+} -+ -+/* -+ - regpiece - something followed by possible [*+?] -+ * -+ * Note that the branching code sequences used for ? and the general cases -+ * of * and + are somewhat optimized: they use the same NOTHING node as -+ * both the endmarker for their branch list and the body of the last branch. -+ * It might seem that this node could be dispensed with entirely, but the -+ * endmarker role is not redundant. -+ */ -+static char * -+regpiece(struct match_globals *g, int *flagp) -+{ -+ register char *ret; -+ register char op; -+ register char *next; -+ int flags; -+ -+ ret = regatom(g, &flags); -+ if (ret == NULL) -+ return(NULL); -+ -+ op = *g->regparse; -+ if (!ISMULT(op)) { -+ *flagp = flags; -+ return(ret); -+ } -+ -+ if (!(flags&HASWIDTH) && op != '?') -+ FAIL("*+ operand could be empty"); -+ *flagp = (op != '+') ? (WORST|SPSTART) : (WORST|HASWIDTH); -+ -+ if (op == '*' && (flags&SIMPLE)) -+ reginsert(g, STAR, ret); -+ else if (op == '*') { -+ /* Emit x* as (x&|), where & means "self". */ -+ reginsert(g, BRANCH, ret); /* Either x */ -+ regoptail(g, ret, regnode(g, BACK)); /* and loop */ -+ regoptail(g, ret, ret); /* back */ -+ regtail(g, ret, regnode(g, BRANCH)); /* or */ -+ regtail(g, ret, regnode(g, NOTHING)); /* null. */ -+ } else if (op == '+' && (flags&SIMPLE)) -+ reginsert(g, PLUS, ret); -+ else if (op == '+') { -+ /* Emit x+ as x(&|), where & means "self". */ -+ next = regnode(g, BRANCH); /* Either */ -+ regtail(g, ret, next); -+ regtail(g, regnode(g, BACK), ret); /* loop back */ -+ regtail(g, next, regnode(g, BRANCH)); /* or */ -+ regtail(g, ret, regnode(g, NOTHING)); /* null. */ -+ } else if (op == '?') { -+ /* Emit x? as (x|) */ -+ reginsert(g, BRANCH, ret); /* Either x */ -+ regtail(g, ret, regnode(g, BRANCH)); /* or */ -+ next = regnode(g, NOTHING); /* null. */ -+ regtail(g, ret, next); -+ regoptail(g, ret, next); -+ } -+ g->regparse++; -+ if (ISMULT(*g->regparse)) -+ FAIL("nested *?+"); -+ -+ return(ret); -+} -+ -+/* -+ - regatom - the lowest level -+ * -+ * Optimization: gobbles an entire sequence of ordinary characters so that -+ * it can turn them into a single node, which is smaller to store and -+ * faster to run. Backslashed characters are exceptions, each becoming a -+ * separate node; the code is simpler that way and it's not worth fixing. -+ */ -+static char * -+regatom(struct match_globals *g, int *flagp) -+{ -+ register char *ret; -+ int flags; -+ -+ *flagp = WORST; /* Tentatively. */ -+ -+ switch (*g->regparse++) { -+ case '^': -+ ret = regnode(g, BOL); -+ break; -+ case '$': -+ ret = regnode(g, EOL); -+ break; -+ case '.': -+ ret = regnode(g, ANY); -+ *flagp |= HASWIDTH|SIMPLE; -+ break; -+ case '[': { -+ register int class; -+ register int classend; -+ -+ if (*g->regparse == '^') { /* Complement of range. */ -+ ret = regnode(g, ANYBUT); -+ g->regparse++; -+ } else -+ ret = regnode(g, ANYOF); -+ if (*g->regparse == ']' || *g->regparse == '-') -+ regc(g, *g->regparse++); -+ while (*g->regparse != '\0' && *g->regparse != ']') { -+ if (*g->regparse == '-') { -+ g->regparse++; -+ if (*g->regparse == ']' || *g->regparse == '\0') -+ regc(g, '-'); -+ else { -+ class = UCHARAT(g->regparse-2)+1; -+ classend = UCHARAT(g->regparse); -+ if (class > classend+1) -+ FAIL("invalid [] range"); -+ for (; class <= classend; class++) -+ regc(g, class); -+ g->regparse++; -+ } -+ } else -+ regc(g, *g->regparse++); -+ } -+ regc(g, '\0'); -+ if (*g->regparse != ']') -+ FAIL("unmatched []"); -+ g->regparse++; -+ *flagp |= HASWIDTH|SIMPLE; -+ } -+ break; -+ case '(': -+ ret = reg(g, 1, &flags); -+ if (ret == NULL) -+ return(NULL); -+ *flagp |= flags&(HASWIDTH|SPSTART); -+ break; -+ case '\0': -+ case '|': -+ case ')': -+ FAIL("internal urp"); /* Supposed to be caught earlier. */ -+ break; -+ case '?': -+ case '+': -+ case '*': -+ FAIL("?+* follows nothing"); -+ break; -+ case '\\': -+ if (*g->regparse == '\0') -+ FAIL("trailing \\"); -+ ret = regnode(g, EXACTLY); -+ regc(g, *g->regparse++); -+ regc(g, '\0'); -+ *flagp |= HASWIDTH|SIMPLE; -+ break; -+ default: { -+ register int len; -+ register char ender; -+ -+ g->regparse--; -+ len = my_strcspn((const char *)g->regparse, (const char *)META); -+ if (len <= 0) -+ FAIL("internal disaster"); -+ ender = *(g->regparse+len); -+ if (len > 1 && ISMULT(ender)) -+ len--; /* Back off clear of ?+* operand. */ -+ *flagp |= HASWIDTH; -+ if (len == 1) -+ *flagp |= SIMPLE; -+ ret = regnode(g, EXACTLY); -+ while (len > 0) { -+ regc(g, *g->regparse++); -+ len--; -+ } -+ regc(g, '\0'); -+ } -+ break; -+ } -+ -+ return(ret); -+} -+ -+/* -+ - regnode - emit a node -+ */ -+static char * /* Location. */ -+regnode(struct match_globals *g, char op) -+{ -+ register char *ret; -+ register char *ptr; -+ -+ ret = g->regcode; -+ if (ret == &g->regdummy) { -+ g->regsize += 3; -+ return(ret); -+ } -+ -+ ptr = ret; -+ *ptr++ = op; -+ *ptr++ = '\0'; /* Null "next" pointer. */ -+ *ptr++ = '\0'; -+ g->regcode = ptr; -+ -+ return(ret); -+} -+ -+/* -+ - regc - emit (if appropriate) a byte of code -+ */ -+static void -+regc(struct match_globals *g, char b) -+{ -+ if (g->regcode != &g->regdummy) -+ *g->regcode++ = b; -+ else -+ g->regsize++; -+} -+ -+/* -+ - reginsert - insert an operator in front of already-emitted operand -+ * -+ * Means relocating the operand. -+ */ -+static void -+reginsert(struct match_globals *g, char op, char* opnd) -+{ -+ register char *src; -+ register char *dst; -+ register char *place; -+ -+ if (g->regcode == &g->regdummy) { -+ g->regsize += 3; -+ return; -+ } -+ -+ src = g->regcode; -+ g->regcode += 3; -+ dst = g->regcode; -+ while (src > opnd) -+ *--dst = *--src; -+ -+ place = opnd; /* Op node, where operand used to be. */ -+ *place++ = op; -+ *place++ = '\0'; -+ *place++ = '\0'; -+} -+ -+/* -+ - regtail - set the next-pointer at the end of a node chain -+ */ -+static void -+regtail(struct match_globals *g, char *p, char *val) -+{ -+ register char *scan; -+ register char *temp; -+ register int offset; -+ -+ if (p == &g->regdummy) -+ return; -+ -+ /* Find last node. */ -+ scan = p; -+ for (;;) { -+ temp = regnext(g, scan); -+ if (temp == NULL) -+ break; -+ scan = temp; -+ } -+ -+ if (OP(scan) == BACK) -+ offset = scan - val; -+ else -+ offset = val - scan; -+ *(scan+1) = (offset>>8)&0377; -+ *(scan+2) = offset&0377; -+} -+ -+/* -+ - regoptail - regtail on operand of first argument; nop if operandless -+ */ -+static void -+regoptail(struct match_globals *g, char *p, char *val) -+{ -+ /* "Operandless" and "op != BRANCH" are synonymous in practice. */ -+ if (p == NULL || p == &g->regdummy || OP(p) != BRANCH) -+ return; -+ regtail(g, OPERAND(p), val); -+} -+ -+/* -+ * regexec and friends -+ */ -+ -+ -+/* -+ * Forwards. -+ */ -+STATIC int regtry(struct match_globals *g, regexp *prog, char *string); -+STATIC int regmatch(struct match_globals *g, char *prog); -+STATIC int regrepeat(struct match_globals *g, char *p); -+ -+#ifdef DEBUG -+int regnarrate = 0; -+void regdump(); -+STATIC char *regprop(char *op); -+#endif -+ -+/* -+ - regexec - match a regexp against a string -+ */ -+int -+regexec(regexp *prog, char *string) -+{ -+ register char *s; -+ struct match_globals g; -+ -+ /* Be paranoid... */ -+ if (prog == NULL || string == NULL) { -+ printk("<3>Regexp: NULL parameter\n"); -+ return(0); -+ } -+ -+ /* Check validity of program. */ -+ if (UCHARAT(prog->program) != MAGIC) { -+ printk("<3>Regexp: corrupted program\n"); -+ return(0); -+ } -+ -+ /* If there is a "must appear" string, look for it. */ -+ if (prog->regmust != NULL) { -+ s = string; -+ while ((s = strchr(s, prog->regmust[0])) != NULL) { -+ if (strncmp(s, prog->regmust, prog->regmlen) == 0) -+ break; /* Found it. */ -+ s++; -+ } -+ if (s == NULL) /* Not present. */ -+ return(0); -+ } -+ -+ /* Mark beginning of line for ^ . */ -+ g.regbol = string; -+ -+ /* Simplest case: anchored match need be tried only once. */ -+ if (prog->reganch) -+ return(regtry(&g, prog, string)); -+ -+ /* Messy cases: unanchored match. */ -+ s = string; -+ if (prog->regstart != '\0') -+ /* We know what char it must start with. */ -+ while ((s = strchr(s, prog->regstart)) != NULL) { -+ if (regtry(&g, prog, s)) -+ return(1); -+ s++; -+ } -+ else -+ /* We don't -- general case. */ -+ do { -+ if (regtry(&g, prog, s)) -+ return(1); -+ } while (*s++ != '\0'); -+ -+ /* Failure. */ -+ return(0); -+} -+ -+/* -+ - regtry - try match at specific point -+ */ -+static int /* 0 failure, 1 success */ -+regtry(struct match_globals *g, regexp *prog, char *string) -+{ -+ register int i; -+ register char **sp; -+ register char **ep; -+ -+ g->reginput = string; -+ g->regstartp = prog->startp; -+ g->regendp = prog->endp; -+ -+ sp = prog->startp; -+ ep = prog->endp; -+ for (i = NSUBEXP; i > 0; i--) { -+ *sp++ = NULL; -+ *ep++ = NULL; -+ } -+ if (regmatch(g, prog->program + 1)) { -+ prog->startp[0] = string; -+ prog->endp[0] = g->reginput; -+ return(1); -+ } else -+ return(0); -+} -+ -+/* -+ - regmatch - main matching routine -+ * -+ * Conceptually the strategy is simple: check to see whether the current -+ * node matches, call self recursively to see whether the rest matches, -+ * and then act accordingly. In practice we make some effort to avoid -+ * recursion, in particular by going through "ordinary" nodes (that don't -+ * need to know whether the rest of the match failed) by a loop instead of -+ * by recursion. -+ */ -+static int /* 0 failure, 1 success */ -+regmatch(struct match_globals *g, char *prog) -+{ -+ register char *scan = prog; /* Current node. */ -+ char *next; /* Next node. */ -+ -+#ifdef DEBUG -+ if (scan != NULL && regnarrate) -+ fprintf(stderr, "%s(\n", regprop(scan)); -+#endif -+ while (scan != NULL) { -+#ifdef DEBUG -+ if (regnarrate) -+ fprintf(stderr, "%s...\n", regprop(scan)); -+#endif -+ next = regnext(g, scan); -+ -+ switch (OP(scan)) { -+ case BOL: -+ if (g->reginput != g->regbol) -+ return(0); -+ break; -+ case EOL: -+ if (*g->reginput != '\0') -+ return(0); -+ break; -+ case ANY: -+ if (*g->reginput == '\0') -+ return(0); -+ g->reginput++; -+ break; -+ case EXACTLY: { -+ register int len; -+ register char *opnd; -+ -+ opnd = OPERAND(scan); -+ /* Inline the first character, for speed. */ -+ if (*opnd != *g->reginput) -+ return(0); -+ len = strlen(opnd); -+ if (len > 1 && strncmp(opnd, g->reginput, len) != 0) -+ return(0); -+ g->reginput += len; -+ } -+ break; -+ case ANYOF: -+ if (*g->reginput == '\0' || strchr(OPERAND(scan), *g->reginput) == NULL) -+ return(0); -+ g->reginput++; -+ break; -+ case ANYBUT: -+ if (*g->reginput == '\0' || strchr(OPERAND(scan), *g->reginput) != NULL) -+ return(0); -+ g->reginput++; -+ break; -+ case NOTHING: -+ case BACK: -+ break; -+ case OPEN+1: -+ case OPEN+2: -+ case OPEN+3: -+ case OPEN+4: -+ case OPEN+5: -+ case OPEN+6: -+ case OPEN+7: -+ case OPEN+8: -+ case OPEN+9: { -+ register int no; -+ register char *save; -+ -+ no = OP(scan) - OPEN; -+ save = g->reginput; -+ -+ if (regmatch(g, next)) { -+ /* -+ * Don't set startp if some later -+ * invocation of the same parentheses -+ * already has. -+ */ -+ if (g->regstartp[no] == NULL) -+ g->regstartp[no] = save; -+ return(1); -+ } else -+ return(0); -+ } -+ break; -+ case CLOSE+1: -+ case CLOSE+2: -+ case CLOSE+3: -+ case CLOSE+4: -+ case CLOSE+5: -+ case CLOSE+6: -+ case CLOSE+7: -+ case CLOSE+8: -+ case CLOSE+9: -+ { -+ register int no; -+ register char *save; -+ -+ no = OP(scan) - CLOSE; -+ save = g->reginput; -+ -+ if (regmatch(g, next)) { -+ /* -+ * Don't set endp if some later -+ * invocation of the same parentheses -+ * already has. -+ */ -+ if (g->regendp[no] == NULL) -+ g->regendp[no] = save; -+ return(1); -+ } else -+ return(0); -+ } -+ break; -+ case BRANCH: { -+ register char *save; -+ -+ if (OP(next) != BRANCH) /* No choice. */ -+ next = OPERAND(scan); /* Avoid recursion. */ -+ else { -+ do { -+ save = g->reginput; -+ if (regmatch(g, OPERAND(scan))) -+ return(1); -+ g->reginput = save; -+ scan = regnext(g, scan); -+ } while (scan != NULL && OP(scan) == BRANCH); -+ return(0); -+ /* NOTREACHED */ -+ } -+ } -+ break; -+ case STAR: -+ case PLUS: { -+ register char nextch; -+ register int no; -+ register char *save; -+ register int min; -+ -+ /* -+ * Lookahead to avoid useless match attempts -+ * when we know what character comes next. -+ */ -+ nextch = '\0'; -+ if (OP(next) == EXACTLY) -+ nextch = *OPERAND(next); -+ min = (OP(scan) == STAR) ? 0 : 1; -+ save = g->reginput; -+ no = regrepeat(g, OPERAND(scan)); -+ while (no >= min) { -+ /* If it could work, try it. */ -+ if (nextch == '\0' || *g->reginput == nextch) -+ if (regmatch(g, next)) -+ return(1); -+ /* Couldn't or didn't -- back up. */ -+ no--; -+ g->reginput = save + no; -+ } -+ return(0); -+ } -+ break; -+ case END: -+ return(1); /* Success! */ -+ break; -+ default: -+ printk("<3>Regexp: memory corruption\n"); -+ return(0); -+ break; -+ } -+ -+ scan = next; -+ } -+ -+ /* -+ * We get here only if there's trouble -- normally "case END" is -+ * the terminating point. -+ */ -+ printk("<3>Regexp: corrupted pointers\n"); -+ return(0); -+} -+ -+/* -+ - regrepeat - repeatedly match something simple, report how many -+ */ -+static int -+regrepeat(struct match_globals *g, char *p) -+{ -+ register int count = 0; -+ register char *scan; -+ register char *opnd; -+ -+ scan = g->reginput; -+ opnd = OPERAND(p); -+ switch (OP(p)) { -+ case ANY: -+ count = strlen(scan); -+ scan += count; -+ break; -+ case EXACTLY: -+ while (*opnd == *scan) { -+ count++; -+ scan++; -+ } -+ break; -+ case ANYOF: -+ while (*scan != '\0' && strchr(opnd, *scan) != NULL) { -+ count++; -+ scan++; -+ } -+ break; -+ case ANYBUT: -+ while (*scan != '\0' && strchr(opnd, *scan) == NULL) { -+ count++; -+ scan++; -+ } -+ break; -+ default: /* Oh dear. Called inappropriately. */ -+ printk("<3>Regexp: internal foulup\n"); -+ count = 0; /* Best compromise. */ -+ break; -+ } -+ g->reginput = scan; -+ -+ return(count); -+} -+ -+/* -+ - regnext - dig the "next" pointer out of a node -+ */ -+static char* -+regnext(struct match_globals *g, char *p) -+{ -+ register int offset; -+ -+ if (p == &g->regdummy) -+ return(NULL); -+ -+ offset = NEXT(p); -+ if (offset == 0) -+ return(NULL); -+ -+ if (OP(p) == BACK) -+ return(p-offset); -+ else -+ return(p+offset); -+} -+ -+#ifdef DEBUG -+ -+STATIC char *regprop(); -+ -+/* -+ - regdump - dump a regexp onto stdout in vaguely comprehensible form -+ */ -+void -+regdump(regexp *r) -+{ -+ register char *s; -+ register char op = EXACTLY; /* Arbitrary non-END op. */ -+ register char *next; -+ /* extern char *strchr(); */ -+ -+ -+ s = r->program + 1; -+ while (op != END) { /* While that wasn't END last time... */ -+ op = OP(s); -+ printf("%2d%s", s-r->program, regprop(s)); /* Where, what. */ -+ next = regnext(s); -+ if (next == NULL) /* Next ptr. */ -+ printf("(0)"); -+ else -+ printf("(%d)", (s-r->program)+(next-s)); -+ s += 3; -+ if (op == ANYOF || op == ANYBUT || op == EXACTLY) { -+ /* Literal string, where present. */ -+ while (*s != '\0') { -+ putchar(*s); -+ s++; -+ } -+ s++; -+ } -+ putchar('\n'); -+ } -+ -+ /* Header fields of interest. */ -+ if (r->regstart != '\0') -+ printf("start `%c' ", r->regstart); -+ if (r->reganch) -+ printf("anchored "); -+ if (r->regmust != NULL) -+ printf("must have \"%s\"", r->regmust); -+ printf("\n"); -+} -+ -+/* -+ - regprop - printable representation of opcode -+ */ -+static char * -+regprop(char *op) -+{ -+#define BUFLEN 50 -+ register char *p; -+ static char buf[BUFLEN]; -+ -+ strcpy(buf, ":"); -+ -+ switch (OP(op)) { -+ case BOL: -+ p = "BOL"; -+ break; -+ case EOL: -+ p = "EOL"; -+ break; -+ case ANY: -+ p = "ANY"; -+ break; -+ case ANYOF: -+ p = "ANYOF"; -+ break; -+ case ANYBUT: -+ p = "ANYBUT"; -+ break; -+ case BRANCH: -+ p = "BRANCH"; -+ break; -+ case EXACTLY: -+ p = "EXACTLY"; -+ break; -+ case NOTHING: -+ p = "NOTHING"; -+ break; -+ case BACK: -+ p = "BACK"; -+ break; -+ case END: -+ p = "END"; -+ break; -+ case OPEN+1: -+ case OPEN+2: -+ case OPEN+3: -+ case OPEN+4: -+ case OPEN+5: -+ case OPEN+6: -+ case OPEN+7: -+ case OPEN+8: -+ case OPEN+9: -+ snprintf(buf+strlen(buf),BUFLEN-strlen(buf), "OPEN%d", OP(op)-OPEN); -+ p = NULL; -+ break; -+ case CLOSE+1: -+ case CLOSE+2: -+ case CLOSE+3: -+ case CLOSE+4: -+ case CLOSE+5: -+ case CLOSE+6: -+ case CLOSE+7: -+ case CLOSE+8: -+ case CLOSE+9: -+ snprintf(buf+strlen(buf),BUFLEN-strlen(buf), "CLOSE%d", OP(op)-CLOSE); -+ p = NULL; -+ break; -+ case STAR: -+ p = "STAR"; -+ break; -+ case PLUS: -+ p = "PLUS"; -+ break; -+ default: -+ printk("<3>Regexp: corrupted opcode\n"); -+ break; -+ } -+ if (p != NULL) -+ strncat(buf, p, BUFLEN-strlen(buf)); -+ return(buf); -+} -+#endif -+ -+ ---- /dev/null -+++ b/net/netfilter/regexp/regexp.h -@@ -0,0 +1,41 @@ -+/* -+ * Definitions etc. for regexp(3) routines. -+ * -+ * Caveat: this is V8 regexp(3) [actually, a reimplementation thereof], -+ * not the System V one. -+ */ -+ -+#ifndef REGEXP_H -+#define REGEXP_H -+ -+ -+/* -+http://www.opensource.apple.com/darwinsource/10.3/expect-1/expect/expect.h , -+which contains a version of this library, says: -+ -+ * -+ * NSUBEXP must be at least 10, and no greater than 117 or the parser -+ * will not work properly. -+ * -+ -+However, it looks rather like this library is limited to 10. If you think -+otherwise, let us know. -+*/ -+ -+#define NSUBEXP 10 -+typedef struct regexp { -+ char *startp[NSUBEXP]; -+ char *endp[NSUBEXP]; -+ char regstart; /* Internal use only. */ -+ char reganch; /* Internal use only. */ -+ char *regmust; /* Internal use only. */ -+ int regmlen; /* Internal use only. */ -+ char program[1]; /* Unwarranted chumminess with compiler. */ -+} regexp; -+ -+regexp * regcomp(char *exp, int *patternsize); -+int regexec(regexp *prog, char *string); -+void regsub(regexp *prog, char *source, char *dest); -+void regerror(char *s); -+ -+#endif ---- /dev/null -+++ b/net/netfilter/regexp/regmagic.h -@@ -0,0 +1,5 @@ -+/* -+ * The first byte of the regexp internal "program" is actually this magic -+ * number; the start node begins in the second byte. -+ */ -+#define MAGIC 0234 ---- /dev/null -+++ b/net/netfilter/regexp/regsub.c -@@ -0,0 +1,95 @@ -+/* -+ * regsub -+ * @(#)regsub.c 1.3 of 2 April 86 -+ * -+ * Copyright (c) 1986 by University of Toronto. -+ * Written by Henry Spencer. Not derived from licensed software. -+ * -+ * Permission is granted to anyone to use this software for any -+ * purpose on any computer system, and to redistribute it freely, -+ * subject to the following restrictions: -+ * -+ * 1. The author is not responsible for the consequences of use of -+ * this software, no matter how awful, even if they arise -+ * from defects in it. -+ * -+ * 2. The origin of this software must not be misrepresented, either -+ * by explicit claim or by omission. -+ * -+ * 3. Altered versions must be plainly marked as such, and must not -+ * be misrepresented as being the original software. -+ * -+ * -+ * This code was modified by Ethan Sommer to work within the kernel -+ * (it now uses kmalloc etc..) -+ * -+ */ -+#include "regexp.h" -+#include "regmagic.h" -+#include <linux/string.h> -+ -+ -+#ifndef CHARBITS -+#define UCHARAT(p) ((int)*(unsigned char *)(p)) -+#else -+#define UCHARAT(p) ((int)*(p)&CHARBITS) -+#endif -+ -+#if 0 -+//void regerror(char * s) -+//{ -+// printk("regexp(3): %s", s); -+// /* NOTREACHED */ -+//} -+#endif -+ -+/* -+ - regsub - perform substitutions after a regexp match -+ */ -+void -+regsub(regexp * prog, char * source, char * dest) -+{ -+ register char *src; -+ register char *dst; -+ register char c; -+ register int no; -+ register int len; -+ -+ /* Not necessary and gcc doesn't like it -MLS */ -+ /*extern char *strncpy();*/ -+ -+ if (prog == NULL || source == NULL || dest == NULL) { -+ regerror("NULL parm to regsub"); -+ return; -+ } -+ if (UCHARAT(prog->program) != MAGIC) { -+ regerror("damaged regexp fed to regsub"); -+ return; -+ } -+ -+ src = source; -+ dst = dest; -+ while ((c = *src++) != '\0') { -+ if (c == '&') -+ no = 0; -+ else if (c == '\\' && '0' <= *src && *src <= '9') -+ no = *src++ - '0'; -+ else -+ no = -1; -+ -+ if (no < 0) { /* Ordinary character. */ -+ if (c == '\\' && (*src == '\\' || *src == '&')) -+ c = *src++; -+ *dst++ = c; -+ } else if (prog->startp[no] != NULL && prog->endp[no] != NULL) { -+ len = prog->endp[no] - prog->startp[no]; -+ (void) strncpy(dst, prog->startp[no], len); -+ dst += len; -+ if (len != 0 && *(dst-1) == '\0') { /* strncpy hit NUL. */ -+ regerror("damaged match string"); -+ return; -+ } -+ } -+ } -+ *dst++ = '\0'; -+} ---- a/net/netfilter/nf_conntrack_core.c -+++ b/net/netfilter/nf_conntrack_core.c -@@ -207,6 +207,14 @@ destroy_conntrack(struct nf_conntrack *n - * too. */ - nf_ct_remove_expectations(ct); - -+ #if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE) -+ if(ct->layer7.app_proto) -+ kfree(ct->layer7.app_proto); -+ if(ct->layer7.app_data) -+ kfree(ct->layer7.app_data); -+ #endif -+ -+ - /* We overload first tuple to link into unconfirmed list. */ - if (!nf_ct_is_confirmed(ct)) { - BUG_ON(hlist_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode)); ---- a/net/netfilter/nf_conntrack_standalone.c -+++ b/net/netfilter/nf_conntrack_standalone.c -@@ -179,7 +179,12 @@ static int ct_seq_show(struct seq_file * - return -ENOSPC; - #endif - -- if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use))) -+#if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE) -+ if(conntrack->layer7.app_proto) -+ if(seq_printf(s, "l7proto=%s ", conntrack->layer7.app_proto)) -+ return -ENOSPC; -+#endif -+ if (seq_printf(s, "asdfuse=%u\n", atomic_read(&conntrack->ct_general.use))) - return -ENOSPC; - - return 0; ---- a/include/net/netfilter/nf_conntrack.h -+++ b/include/net/netfilter/nf_conntrack.h -@@ -127,6 +127,22 @@ struct nf_conn - u_int32_t secmark; - #endif - -+#if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || \ -+ defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE) -+ struct { -+ /* -+ * e.g. "http". NULL before decision. "unknown" after decision -+ * if no match. -+ */ -+ char *app_proto; -+ /* -+ * application layer data so far. NULL after match decision. -+ */ -+ char *app_data; -+ unsigned int app_data_len; -+ } layer7; -+#endif -+ - /* Storage reserved for other modules: */ - union nf_conntrack_proto proto; - ---- /dev/null -+++ b/include/linux/netfilter/xt_layer7.h -@@ -0,0 +1,13 @@ -+#ifndef _XT_LAYER7_H -+#define _XT_LAYER7_H -+ -+#define MAX_PATTERN_LEN 8192 -+#define MAX_PROTOCOL_LEN 256 -+ -+struct xt_layer7_info { -+ char protocol[MAX_PROTOCOL_LEN]; -+ char pattern[MAX_PATTERN_LEN]; -+ u_int8_t invert; -+}; -+ -+#endif /* _XT_LAYER7_H */ diff --git a/target/linux/generic-2.6/patches-2.6.25/100-netfilter_layer7_2.17.patch b/target/linux/generic-2.6/patches-2.6.25/100-netfilter_layer7_2.17.patch deleted file mode 100644 index 9bf65dee6..000000000 --- a/target/linux/generic-2.6/patches-2.6.25/100-netfilter_layer7_2.17.patch +++ /dev/null @@ -1,2101 +0,0 @@ ---- a/net/netfilter/Kconfig -+++ b/net/netfilter/Kconfig -@@ -735,6 +735,27 @@ config NETFILTER_XT_MATCH_STATE - - To compile it as a module, choose M here. If unsure, say N. - -+config NETFILTER_XT_MATCH_LAYER7 -+ tristate '"layer7" match support' -+ depends on NETFILTER_XTABLES -+ depends on EXPERIMENTAL && (IP_NF_CONNTRACK || NF_CONNTRACK) -+ depends on NF_CT_ACCT -+ help -+ Say Y if you want to be able to classify connections (and their -+ packets) based on regular expression matching of their application -+ layer data. This is one way to classify applications such as -+ peer-to-peer filesharing systems that do not always use the same -+ port. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ -+config NETFILTER_XT_MATCH_LAYER7_DEBUG -+ bool 'Layer 7 debugging output' -+ depends on NETFILTER_XT_MATCH_LAYER7 -+ help -+ Say Y to get lots of debugging output. -+ -+ - config NETFILTER_XT_MATCH_STATISTIC - tristate '"statistic" match support' - depends on NETFILTER_XTABLES ---- a/net/netfilter/Makefile -+++ b/net/netfilter/Makefile -@@ -77,6 +77,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_RATEEST) - obj-$(CONFIG_NETFILTER_XT_MATCH_REALM) += xt_realm.o - obj-$(CONFIG_NETFILTER_XT_MATCH_SCTP) += xt_sctp.o - obj-$(CONFIG_NETFILTER_XT_MATCH_STATE) += xt_state.o -+obj-$(CONFIG_NETFILTER_XT_MATCH_LAYER7) += xt_layer7.o - obj-$(CONFIG_NETFILTER_XT_MATCH_STATISTIC) += xt_statistic.o - obj-$(CONFIG_NETFILTER_XT_MATCH_STRING) += xt_string.o - obj-$(CONFIG_NETFILTER_XT_MATCH_TCPMSS) += xt_tcpmss.o ---- /dev/null -+++ b/net/netfilter/xt_layer7.c -@@ -0,0 +1,634 @@ -+/* -+ Kernel module to match application layer (OSI layer 7) data in connections. -+ -+ http://l7-filter.sf.net -+ -+ (C) 2003, 2004, 2005, 2006, 2007 Matthew Strait and Ethan Sommer. -+ -+ This program is free software; you can redistribute it and/or -+ modify it under the terms of the GNU General Public License -+ as published by the Free Software Foundation; either version -+ 2 of the License, or (at your option) any later version. -+ http://www.gnu.org/licenses/gpl.txt -+ -+ Based on ipt_string.c (C) 2000 Emmanuel Roger <winfield@freegates.be>, -+ xt_helper.c (C) 2002 Harald Welte and cls_layer7.c (C) 2003 Matthew Strait, -+ Ethan Sommer, Justin Levandoski. -+*/ -+ -+#include <linux/spinlock.h> -+#include <linux/version.h> -+#include <net/ip.h> -+#include <net/tcp.h> -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/netfilter.h> -+#include <net/netfilter/nf_conntrack.h> -+#include <net/netfilter/nf_conntrack_core.h> -+#include <linux/netfilter/x_tables.h> -+#include <linux/netfilter/xt_layer7.h> -+#include <linux/ctype.h> -+#include <linux/proc_fs.h> -+ -+#include "regexp/regexp.c" -+ -+MODULE_LICENSE("GPL"); -+MODULE_AUTHOR("Matthew Strait <quadong@users.sf.net>, Ethan Sommer <sommere@users.sf.net>"); -+MODULE_DESCRIPTION("iptables application layer match module"); -+MODULE_ALIAS("ipt_layer7"); -+MODULE_VERSION("2.17"); -+ -+static int maxdatalen = 2048; // this is the default -+module_param(maxdatalen, int, 0444); -+MODULE_PARM_DESC(maxdatalen, "maximum bytes of data looked at by l7-filter"); -+#ifdef CONFIG_NETFILTER_XT_MATCH_LAYER7_DEBUG -+ #define DPRINTK(format,args...) printk(format,##args) -+#else -+ #define DPRINTK(format,args...) -+#endif -+ -+#define TOTAL_PACKETS master_conntrack->counters[IP_CT_DIR_ORIGINAL].packets + \ -+ master_conntrack->counters[IP_CT_DIR_REPLY].packets -+ -+/* Number of packets whose data we look at. -+This can be modified through /proc/net/layer7_numpackets */ -+static int num_packets = 10; -+ -+static struct pattern_cache { -+ char * regex_string; -+ regexp * pattern; -+ struct pattern_cache * next; -+} * first_pattern_cache = NULL; -+ -+DEFINE_SPINLOCK(l7_lock); -+ -+#ifdef CONFIG_IP_NF_MATCH_LAYER7_DEBUG -+/* Converts an unfriendly string into a friendly one by -+replacing unprintables with periods and all whitespace with " ". */ -+static char * friendly_print(unsigned char * s) -+{ -+ char * f = kmalloc(strlen(s) + 1, GFP_ATOMIC); -+ int i; -+ -+ if(!f) { -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in " -+ "friendly_print, bailing.\n"); -+ return NULL; -+ } -+ -+ for(i = 0; i < strlen(s); i++){ -+ if(isprint(s[i]) && s[i] < 128) f[i] = s[i]; -+ else if(isspace(s[i])) f[i] = ' '; -+ else f[i] = '.'; -+ } -+ f[i] = '\0'; -+ return f; -+} -+ -+static char dec2hex(int i) -+{ -+ switch (i) { -+ case 0 ... 9: -+ return (i + '0'); -+ break; -+ case 10 ... 15: -+ return (i - 10 + 'a'); -+ break; -+ default: -+ if (net_ratelimit()) -+ printk("layer7: Problem in dec2hex\n"); -+ return '\0'; -+ } -+} -+ -+static char * hex_print(unsigned char * s) -+{ -+ char * g = kmalloc(strlen(s)*3 + 1, GFP_ATOMIC); -+ int i; -+ -+ if(!g) { -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in hex_print, " -+ "bailing.\n"); -+ return NULL; -+ } -+ -+ for(i = 0; i < strlen(s); i++) { -+ g[i*3 ] = dec2hex(s[i]/16); -+ g[i*3 + 1] = dec2hex(s[i]%16); -+ g[i*3 + 2] = ' '; -+ } -+ g[i*3] = '\0'; -+ -+ return g; -+} -+#endif // DEBUG -+ -+/* Use instead of regcomp. As we expect to be seeing the same regexps over and -+over again, it make sense to cache the results. */ -+static regexp * compile_and_cache(const char * regex_string, -+ const char * protocol) -+{ -+ struct pattern_cache * node = first_pattern_cache; -+ struct pattern_cache * last_pattern_cache = first_pattern_cache; -+ struct pattern_cache * tmp; -+ unsigned int len; -+ -+ while (node != NULL) { -+ if (!strcmp(node->regex_string, regex_string)) -+ return node->pattern; -+ -+ last_pattern_cache = node;/* points at the last non-NULL node */ -+ node = node->next; -+ } -+ -+ /* If we reach the end of the list, then we have not yet cached -+ the pattern for this regex. Let's do that now. -+ Be paranoid about running out of memory to avoid list corruption. */ -+ tmp = kmalloc(sizeof(struct pattern_cache), GFP_ATOMIC); -+ -+ if(!tmp) { -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in " -+ "compile_and_cache, bailing.\n"); -+ return NULL; -+ } -+ -+ tmp->regex_string = kmalloc(strlen(regex_string) + 1, GFP_ATOMIC); -+ tmp->pattern = kmalloc(sizeof(struct regexp), GFP_ATOMIC); -+ tmp->next = NULL; -+ -+ if(!tmp->regex_string || !tmp->pattern) { -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in " -+ "compile_and_cache, bailing.\n"); -+ kfree(tmp->regex_string); -+ kfree(tmp->pattern); -+ kfree(tmp); -+ return NULL; -+ } -+ -+ /* Ok. The new node is all ready now. */ -+ node = tmp; -+ -+ if(first_pattern_cache == NULL) /* list is empty */ -+ first_pattern_cache = node; /* make node the beginning */ -+ else -+ last_pattern_cache->next = node; /* attach node to the end */ -+ -+ /* copy the string and compile the regex */ -+ len = strlen(regex_string); -+ DPRINTK("About to compile this: \"%s\"\n", regex_string); -+ node->pattern = regcomp((char *)regex_string, &len); -+ if ( !node->pattern ) { -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: Error compiling regexp " -+ "\"%s\" (%s)\n", -+ regex_string, protocol); -+ /* pattern is now cached as NULL, so we won't try again. */ -+ } -+ -+ strcpy(node->regex_string, regex_string); -+ return node->pattern; -+} -+ -+static int can_handle(const struct sk_buff *skb) -+{ -+ if(!ip_hdr(skb)) /* not IP */ -+ return 0; -+ if(ip_hdr(skb)->protocol != IPPROTO_TCP && -+ ip_hdr(skb)->protocol != IPPROTO_UDP && -+ ip_hdr(skb)->protocol != IPPROTO_ICMP) -+ return 0; -+ return 1; -+} -+ -+/* Returns offset the into the skb->data that the application data starts */ -+static int app_data_offset(const struct sk_buff *skb) -+{ -+ /* In case we are ported somewhere (ebtables?) where ip_hdr(skb) -+ isn't set, this can be gotten from 4*(skb->data[0] & 0x0f) as well. */ -+ int ip_hl = 4*ip_hdr(skb)->ihl; -+ -+ if( ip_hdr(skb)->protocol == IPPROTO_TCP ) { -+ /* 12 == offset into TCP header for the header length field. -+ Can't get this with skb->h.th->doff because the tcphdr -+ struct doesn't get set when routing (this is confirmed to be -+ true in Netfilter as well as QoS.) */ -+ int tcp_hl = 4*(skb->data[ip_hl + 12] >> 4); -+ -+ return ip_hl + tcp_hl; -+ } else if( ip_hdr(skb)->protocol == IPPROTO_UDP ) { -+ return ip_hl + 8; /* UDP header is always 8 bytes */ -+ } else if( ip_hdr(skb)->protocol == IPPROTO_ICMP ) { -+ return ip_hl + 8; /* ICMP header is 8 bytes */ -+ } else { -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: tried to handle unknown " -+ "protocol!\n"); -+ return ip_hl + 8; /* something reasonable */ -+ } -+} -+ -+/* handles whether there's a match when we aren't appending data anymore */ -+static int match_no_append(struct nf_conn * conntrack, -+ struct nf_conn * master_conntrack, -+ enum ip_conntrack_info ctinfo, -+ enum ip_conntrack_info master_ctinfo, -+ const struct xt_layer7_info * info) -+{ -+ /* If we're in here, throw the app data away */ -+ if(master_conntrack->layer7.app_data != NULL) { -+ -+ #ifdef CONFIG_IP_NF_MATCH_LAYER7_DEBUG -+ if(!master_conntrack->layer7.app_proto) { -+ char * f = -+ friendly_print(master_conntrack->layer7.app_data); -+ char * g = -+ hex_print(master_conntrack->layer7.app_data); -+ DPRINTK("\nl7-filter gave up after %d bytes " -+ "(%d packets):\n%s\n", -+ strlen(f), TOTAL_PACKETS, f); -+ kfree(f); -+ DPRINTK("In hex: %s\n", g); -+ kfree(g); -+ } -+ #endif -+ -+ kfree(master_conntrack->layer7.app_data); -+ master_conntrack->layer7.app_data = NULL; /* don't free again */ -+ } -+ -+ if(master_conntrack->layer7.app_proto){ -+ /* Here child connections set their .app_proto (for /proc) */ -+ if(!conntrack->layer7.app_proto) { -+ conntrack->layer7.app_proto = -+ kmalloc(strlen(master_conntrack->layer7.app_proto)+1, -+ GFP_ATOMIC); -+ if(!conntrack->layer7.app_proto){ -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory " -+ "in match_no_append, " -+ "bailing.\n"); -+ return 1; -+ } -+ strcpy(conntrack->layer7.app_proto, -+ master_conntrack->layer7.app_proto); -+ } -+ -+ return (!strcmp(master_conntrack->layer7.app_proto, -+ info->protocol)); -+ } -+ else { -+ /* If not classified, set to "unknown" to distinguish from -+ connections that are still being tested. */ -+ master_conntrack->layer7.app_proto = -+ kmalloc(strlen("unknown")+1, GFP_ATOMIC); -+ if(!master_conntrack->layer7.app_proto){ -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in " -+ "match_no_append, bailing.\n"); -+ return 1; -+ } -+ strcpy(master_conntrack->layer7.app_proto, "unknown"); -+ return 0; -+ } -+} -+ -+/* add the new app data to the conntrack. Return number of bytes added. */ -+static int add_data(struct nf_conn * master_conntrack, -+ char * app_data, int appdatalen) -+{ -+ int length = 0, i; -+ int oldlength = master_conntrack->layer7.app_data_len; -+ -+ /* This is a fix for a race condition by Deti Fliegl. However, I'm not -+ clear on whether the race condition exists or whether this really -+ fixes it. I might just be being dense... Anyway, if it's not really -+ a fix, all it does is waste a very small amount of time. */ -+ if(!master_conntrack->layer7.app_data) return 0; -+ -+ /* Strip nulls. Make everything lower case (our regex lib doesn't -+ do case insensitivity). Add it to the end of the current data. */ -+ for(i = 0; i < maxdatalen-oldlength-1 && -+ i < appdatalen; i++) { -+ if(app_data[i] != '\0') { -+ /* the kernel version of tolower mungs 'upper ascii' */ -+ master_conntrack->layer7.app_data[length+oldlength] = -+ isascii(app_data[i])? -+ tolower(app_data[i]) : app_data[i]; -+ length++; -+ } -+ } -+ -+ master_conntrack->layer7.app_data[length+oldlength] = '\0'; -+ master_conntrack->layer7.app_data_len = length + oldlength; -+ -+ return length; -+} -+ -+/* taken from drivers/video/modedb.c */ -+static int my_atoi(const char *s) -+{ -+ int val = 0; -+ -+ for (;; s++) { -+ switch (*s) { -+ case '0'...'9': -+ val = 10*val+(*s-'0'); -+ break; -+ default: -+ return val; -+ } -+ } -+} -+ -+/* write out num_packets to userland. */ -+static int layer7_read_proc(char* page, char ** start, off_t off, int count, -+ int* eof, void * data) -+{ -+ if(num_packets > 99 && net_ratelimit()) -+ printk(KERN_ERR "layer7: NOT REACHED. num_packets too big\n"); -+ -+ page[0] = num_packets/10 + '0'; -+ page[1] = num_packets%10 + '0'; -+ page[2] = '\n'; -+ page[3] = '\0'; -+ -+ *eof=1; -+ -+ return 3; -+} -+ -+/* Read in num_packets from userland */ -+static int layer7_write_proc(struct file* file, const char* buffer, -+ unsigned long count, void *data) -+{ -+ char * foo = kmalloc(count, GFP_ATOMIC); -+ -+ if(!foo){ -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory, bailing. " -+ "num_packets unchanged.\n"); -+ return count; -+ } -+ -+ if(copy_from_user(foo, buffer, count)) { -+ return -EFAULT; -+ } -+ -+ -+ num_packets = my_atoi(foo); -+ kfree (foo); -+ -+ /* This has an arbitrary limit to make the math easier. I'm lazy. -+ But anyway, 99 is a LOT! If you want more, you're doing it wrong! */ -+ if(num_packets > 99) { -+ printk(KERN_WARNING "layer7: num_packets can't be > 99.\n"); -+ num_packets = 99; -+ } else if(num_packets < 1) { -+ printk(KERN_WARNING "layer7: num_packets can't be < 1.\n"); -+ num_packets = 1; -+ } -+ -+ return count; -+} -+ -+static bool -+match(const struct sk_buff *skbin, -+ const struct net_device *in, -+ const struct net_device *out, -+ const struct xt_match *match, -+ const void *matchinfo, -+ int offset, -+ unsigned int protoff, -+ bool *hotdrop) -+{ -+ /* sidestep const without getting a compiler warning... */ -+ struct sk_buff * skb = (struct sk_buff *)skbin; -+ -+ const struct xt_layer7_info * info = matchinfo; -+ enum ip_conntrack_info master_ctinfo, ctinfo; -+ struct nf_conn *master_conntrack, *conntrack; -+ unsigned char * app_data; -+ unsigned int pattern_result, appdatalen; -+ regexp * comppattern; -+ -+ /* Be paranoid/incompetent - lock the entire match function. */ -+ spin_lock_bh(&l7_lock); -+ -+ if(!can_handle(skb)){ -+ DPRINTK("layer7: This is some protocol I can't handle.\n"); -+ spin_unlock_bh(&l7_lock); -+ return info->invert; -+ } -+ -+ /* Treat parent & all its children together as one connection, except -+ for the purpose of setting conntrack->layer7.app_proto in the actual -+ connection. This makes /proc/net/ip_conntrack more satisfying. */ -+ if(!(conntrack = nf_ct_get(skb, &ctinfo)) || -+ !(master_conntrack=nf_ct_get(skb,&master_ctinfo))){ -+ DPRINTK("layer7: couldn't get conntrack.\n"); -+ spin_unlock_bh(&l7_lock); -+ return info->invert; -+ } -+ -+ /* Try to get a master conntrack (and its master etc) for FTP, etc. */ -+ while (master_ct(master_conntrack) != NULL) -+ master_conntrack = master_ct(master_conntrack); -+ -+ /* if we've classified it or seen too many packets */ -+ if(TOTAL_PACKETS > num_packets || -+ master_conntrack->layer7.app_proto) { -+ -+ pattern_result = match_no_append(conntrack, master_conntrack, -+ ctinfo, master_ctinfo, info); -+ -+ /* skb->cb[0] == seen. Don't do things twice if there are -+ multiple l7 rules. I'm not sure that using cb for this purpose -+ is correct, even though it says "put your private variables -+ there". But it doesn't look like it is being used for anything -+ else in the skbs that make it here. */ -+ skb->cb[0] = 1; /* marking it seen here's probably irrelevant */ -+ -+ spin_unlock_bh(&l7_lock); -+ return (pattern_result ^ info->invert); -+ } -+ -+ if(skb_is_nonlinear(skb)){ -+ if(skb_linearize(skb) != 0){ -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: failed to linearize " -+ "packet, bailing.\n"); -+ spin_unlock_bh(&l7_lock); -+ return info->invert; -+ } -+ } -+ -+ /* now that the skb is linearized, it's safe to set these. */ -+ app_data = skb->data + app_data_offset(skb); -+ appdatalen = skb_tail_pointer(skb) - app_data; -+ -+ /* the return value gets checked later, when we're ready to use it */ -+ comppattern = compile_and_cache(info->pattern, info->protocol); -+ -+ /* On the first packet of a connection, allocate space for app data */ -+ if(TOTAL_PACKETS == 1 && !skb->cb[0] && -+ !master_conntrack->layer7.app_data){ -+ master_conntrack->layer7.app_data = -+ kmalloc(maxdatalen, GFP_ATOMIC); -+ if(!master_conntrack->layer7.app_data){ -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in " -+ "match, bailing.\n"); -+ spin_unlock_bh(&l7_lock); -+ return info->invert; -+ } -+ -+ master_conntrack->layer7.app_data[0] = '\0'; -+ } -+ -+ /* Can be here, but unallocated, if numpackets is increased near -+ the beginning of a connection */ -+ if(master_conntrack->layer7.app_data == NULL){ -+ spin_unlock_bh(&l7_lock); -+ return (info->invert); /* unmatched */ -+ } -+ -+ if(!skb->cb[0]){ -+ int newbytes; -+ newbytes = add_data(master_conntrack, app_data, appdatalen); -+ -+ if(newbytes == 0) { /* didn't add any data */ -+ skb->cb[0] = 1; -+ /* Didn't match before, not going to match now */ -+ spin_unlock_bh(&l7_lock); -+ return info->invert; -+ } -+ } -+ -+ /* If looking for "unknown", then never match. "Unknown" means that -+ we've given up; we're still trying with these packets. */ -+ if(!strcmp(info->protocol, "unknown")) { -+ pattern_result = 0; -+ /* If looking for "unset", then always match. "Unset" means that we -+ haven't yet classified the connection. */ -+ } else if(!strcmp(info->protocol, "unset")) { -+ pattern_result = 2; -+ DPRINTK("layer7: matched unset: not yet classified " -+ "(%d/%d packets)\n", TOTAL_PACKETS, num_packets); -+ /* If the regexp failed to compile, don't bother running it */ -+ } else if(comppattern && -+ regexec(comppattern, master_conntrack->layer7.app_data)){ -+ DPRINTK("layer7: matched %s\n", info->protocol); -+ pattern_result = 1; -+ } else pattern_result = 0; -+ -+ if(pattern_result == 1) { -+ master_conntrack->layer7.app_proto = -+ kmalloc(strlen(info->protocol)+1, GFP_ATOMIC); -+ if(!master_conntrack->layer7.app_proto){ -+ if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in " -+ "match, bailing.\n"); -+ spin_unlock_bh(&l7_lock); -+ return (pattern_result ^ info->invert); -+ } -+ strcpy(master_conntrack->layer7.app_proto, info->protocol); -+ } else if(pattern_result > 1) { /* cleanup from "unset" */ -+ pattern_result = 1; -+ } -+ -+ /* mark the packet seen */ -+ skb->cb[0] = 1; -+ -+ spin_unlock_bh(&l7_lock); -+ return (pattern_result ^ info->invert); -+} -+ -+static bool check(const char *tablename, -+ const void *inf, -+ const struct xt_match *match, -+ void *matchinfo, -+ unsigned int hook_mask) -+ -+{ -+ // load nf_conntrack_ipv4 -+ if (nf_ct_l3proto_try_module_get(match->family) < 0) { -+ printk(KERN_WARNING "can't load conntrack support for " -+ "proto=%d\n", match->family); -+ return false; -+ } -+ return true; -+} -+ -+static void -+destroy(const struct xt_match *match, void *matchinfo) -+{ -+ nf_ct_l3proto_module_put(match->family); -+} -+ -+static struct xt_match xt_layer7_match[] = { -+{ -+ .name = "layer7", -+ .family = AF_INET, -+ .checkentry = check, -+ .match = match, -+ .destroy = destroy, -+ .matchsize = sizeof(struct xt_layer7_info), -+ .me = THIS_MODULE -+} -+}; -+ -+static void layer7_cleanup_proc(void) -+{ -+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) -+ remove_proc_entry("layer7_numpackets", proc_net); -+#else -+ remove_proc_entry("layer7_numpackets", init_net.proc_net); -+#endif -+} -+ -+/* register the proc file */ -+static void layer7_init_proc(void) -+{ -+ struct proc_dir_entry* entry; -+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23) -+ entry = create_proc_entry("layer7_numpackets", 0644, proc_net); -+#else -+ entry = create_proc_entry("layer7_numpackets", 0644, init_net.proc_net); -+#endif -+ entry->read_proc = layer7_read_proc; -+ entry->write_proc = layer7_write_proc; -+} -+ -+static int __init xt_layer7_init(void) -+{ -+ need_conntrack(); -+ -+ layer7_init_proc(); -+ if(maxdatalen < 1) { -+ printk(KERN_WARNING "layer7: maxdatalen can't be < 1, " -+ "using 1\n"); -+ maxdatalen = 1; -+ } -+ /* This is not a hard limit. It's just here to prevent people from -+ bringing their slow machines to a grinding halt. */ -+ else if(maxdatalen > 65536) { -+ printk(KERN_WARNING "layer7: maxdatalen can't be > 65536, " -+ "using 65536\n"); -+ maxdatalen = 65536; -+ } -+ return xt_register_matches(xt_layer7_match, -+ ARRAY_SIZE(xt_layer7_match)); -+} -+ -+static void __exit xt_layer7_fini(void) -+{ -+ layer7_cleanup_proc(); -+ xt_unregister_matches(xt_layer7_match, ARRAY_SIZE(xt_layer7_match)); -+} -+ -+module_init(xt_layer7_init); -+module_exit(xt_layer7_fini); ---- /dev/null -+++ b/net/netfilter/regexp/regexp.c -@@ -0,0 +1,1197 @@ -+/* -+ * regcomp and regexec -- regsub and regerror are elsewhere -+ * @(#)regexp.c 1.3 of 18 April 87 -+ * -+ * Copyright (c) 1986 by University of Toronto. -+ * Written by Henry Spencer. Not derived from licensed software. -+ * -+ * Permission is granted to anyone to use this software for any -+ * purpose on any computer system, and to redistribute it freely, -+ * subject to the following restrictions: -+ * -+ * 1. The author is not responsible for the consequences of use of -+ * this software, no matter how awful, even if they arise -+ * from defects in it. -+ * -+ * 2. The origin of this software must not be misrepresented, either -+ * by explicit claim or by omission. -+ * -+ * 3. Altered versions must be plainly marked as such, and must not -+ * be misrepresented as being the original software. -+ * -+ * Beware that some of this code is subtly aware of the way operator -+ * precedence is structured in regular expressions. Serious changes in -+ * regular-expression syntax might require a total rethink. -+ * -+ * This code was modified by Ethan Sommer to work within the kernel -+ * (it now uses kmalloc etc..) -+ * -+ * Modified slightly by Matthew Strait to use more modern C. -+ */ -+ -+#include "regexp.h" -+#include "regmagic.h" -+ -+/* added by ethan and matt. Lets it work in both kernel and user space. -+(So iptables can use it, for instance.) Yea, it goes both ways... */ -+#if __KERNEL__ -+ #define malloc(foo) kmalloc(foo,GFP_ATOMIC) -+#else -+ #define printk(format,args...) printf(format,##args) -+#endif -+ -+void regerror(char * s) -+{ -+ printk("<3>Regexp: %s\n", s); -+ /* NOTREACHED */ -+} -+ -+/* -+ * The "internal use only" fields in regexp.h are present to pass info from -+ * compile to execute that permits the execute phase to run lots faster on -+ * simple cases. They are: -+ * -+ * regstart char that must begin a match; '\0' if none obvious -+ * reganch is the match anchored (at beginning-of-line only)? -+ * regmust string (pointer into program) that match must include, or NULL -+ * regmlen length of regmust string -+ * -+ * Regstart and reganch permit very fast decisions on suitable starting points -+ * for a match, cutting down the work a lot. Regmust permits fast rejection -+ * of lines that cannot possibly match. The regmust tests are costly enough -+ * that regcomp() supplies a regmust only if the r.e. contains something -+ * potentially expensive (at present, the only such thing detected is * or + -+ * at the start of the r.e., which can involve a lot of backup). Regmlen is -+ * supplied because the test in regexec() needs it and regcomp() is computing -+ * it anyway. -+ */ -+ -+/* -+ * Structure for regexp "program". This is essentially a linear encoding -+ * of a nondeterministic finite-state machine (aka syntax charts or -+ * "railroad normal form" in parsing technology). Each node is an opcode -+ * plus a "next" pointer, possibly plus an operand. "Next" pointers of -+ * all nodes except BRANCH implement concatenation; a "next" pointer with -+ * a BRANCH on both ends of it is connecting two alternatives. (Here we -+ * have one of the subtle syntax dependencies: an individual BRANCH (as -+ * opposed to a collection of them) is never concatenated with anything -+ * because of operator precedence.) The operand of some types of node is -+ * a literal string; for others, it is a node leading into a sub-FSM. In -+ * particular, the operand of a BRANCH node is the first node of the branch. -+ * (NB this is *not* a tree structure: the tail of the branch connects -+ * to the thing following the set of BRANCHes.) The opcodes are: -+ */ -+ -+/* definition number opnd? meaning */ -+#define END 0 /* no End of program. */ -+#define BOL 1 /* no Match "" at beginning of line. */ -+#define EOL 2 /* no Match "" at end of line. */ -+#define ANY 3 /* no Match any one character. */ -+#define ANYOF 4 /* str Match any character in this string. */ -+#define ANYBUT 5 /* str Match any character not in this string. */ -+#define BRANCH 6 /* node Match this alternative, or the next... */ -+#define BACK 7 /* no Match "", "next" ptr points backward. */ -+#define EXACTLY 8 /* str Match this string. */ -+#define NOTHING 9 /* no Match empty string. */ -+#define STAR 10 /* node Match this (simple) thing 0 or more times. */ -+#define PLUS 11 /* node Match this (simple) thing 1 or more times. */ -+#define OPEN 20 /* no Mark this point in input as start of #n. */ -+ /* OPEN+1 is number 1, etc. */ -+#define CLOSE 30 /* no Analogous to OPEN. */ -+ -+/* -+ * Opcode notes: -+ * -+ * BRANCH The set of branches constituting a single choice are hooked -+ * together with their "next" pointers, since precedence prevents -+ * anything being concatenated to any individual branch. The -+ * "next" pointer of the last BRANCH in a choice points to the -+ * thing following the whole choice. This is also where the -+ * final "next" pointer of each individual branch points; each -+ * branch starts with the operand node of a BRANCH node. -+ * -+ * BACK Normal "next" pointers all implicitly point forward; BACK -+ * exists to make loop structures possible. -+ * -+ * STAR,PLUS '?', and complex '*' and '+', are implemented as circular -+ * BRANCH structures using BACK. Simple cases (one character -+ * per match) are implemented with STAR and PLUS for speed -+ * and to minimize recursive plunges. -+ * -+ * OPEN,CLOSE ...are numbered at compile time. -+ */ -+ -+/* -+ * A node is one char of opcode followed by two chars of "next" pointer. -+ * "Next" pointers are stored as two 8-bit pieces, high order first. The -+ * value is a positive offset from the opcode of the node containing it. -+ * An operand, if any, simply follows the node. (Note that much of the -+ * code generation knows about this implicit relationship.) -+ * -+ * Using two bytes for the "next" pointer is vast overkill for most things, -+ * but allows patterns to get big without disasters. -+ */ -+#define OP(p) (*(p)) -+#define NEXT(p) (((*((p)+1)&0377)<<8) + (*((p)+2)&0377)) -+#define OPERAND(p) ((p) + 3) -+ -+/* -+ * See regmagic.h for one further detail of program structure. -+ */ -+ -+ -+/* -+ * Utility definitions. -+ */ -+#ifndef CHARBITS -+#define UCHARAT(p) ((int)*(unsigned char *)(p)) -+#else -+#define UCHARAT(p) ((int)*(p)&CHARBITS) -+#endif -+ -+#define FAIL(m) { regerror(m); return(NULL); } -+#define ISMULT(c) ((c) == '*' || (c) == '+' || (c) == '?') -+#define META "^$.[()|?+*\\" -+ -+/* -+ * Flags to be passed up and down. -+ */ -+#define HASWIDTH 01 /* Known never to match null string. */ -+#define SIMPLE 02 /* Simple enough to be STAR/PLUS operand. */ -+#define SPSTART 04 /* Starts with * or +. */ -+#define WORST 0 /* Worst case. */ -+ -+/* -+ * Global work variables for regcomp(). -+ */ -+struct match_globals { -+char *reginput; /* String-input pointer. */ -+char *regbol; /* Beginning of input, for ^ check. */ -+char **regstartp; /* Pointer to startp array. */ -+char **regendp; /* Ditto for endp. */ -+char *regparse; /* Input-scan pointer. */ -+int regnpar; /* () count. */ -+char regdummy; -+char *regcode; /* Code-emit pointer; ®dummy = don't. */ -+long regsize; /* Code size. */ -+}; -+ -+/* -+ * Forward declarations for regcomp()'s friends. -+ */ -+#ifndef STATIC -+#define STATIC static -+#endif -+STATIC char *reg(struct match_globals *g, int paren,int *flagp); -+STATIC char *regbranch(struct match_globals *g, int *flagp); -+STATIC char *regpiece(struct match_globals *g, int *flagp); -+STATIC char *regatom(struct match_globals *g, int *flagp); -+STATIC char *regnode(struct match_globals *g, char op); -+STATIC char *regnext(struct match_globals *g, char *p); -+STATIC void regc(struct match_globals *g, char b); -+STATIC void reginsert(struct match_globals *g, char op, char *opnd); -+STATIC void regtail(struct match_globals *g, char *p, char *val); -+STATIC void regoptail(struct match_globals *g, char *p, char *val); -+ -+ -+__kernel_size_t my_strcspn(const char *s1,const char *s2) -+{ -+ char *scan1; -+ char *scan2; -+ int count; -+ -+ count = 0; -+ for (scan1 = (char *)s1; *scan1 != '\0'; scan1++) { -+ for (scan2 = (char *)s2; *scan2 != '\0';) /* ++ moved down. */ -+ if (*scan1 == *scan2++) -+ return(count); -+ count++; -+ } -+ return(count); -+} -+ -+/* -+ - regcomp - compile a regular expression into internal code -+ * -+ * We can't allocate space until we know how big the compiled form will be, -+ * but we can't compile it (and thus know how big it is) until we've got a -+ * place to put the code. So we cheat: we compile it twice, once with code -+ * generation turned off and size counting turned on, and once "for real". -+ * This also means that we don't allocate space until we are sure that the -+ * thing really will compile successfully, and we never have to move the -+ * code and thus invalidate pointers into it. (Note that it has to be in -+ * one piece because free() must be able to free it all.) -+ * -+ * Beware that the optimization-preparation code in here knows about some -+ * of the structure of the compiled regexp. -+ */ -+regexp * -+regcomp(char *exp,int *patternsize) -+{ -+ register regexp *r; -+ register char *scan; -+ register char *longest; -+ register int len; -+ int flags; -+ struct match_globals g; -+ -+ /* commented out by ethan -+ extern char *malloc(); -+ */ -+ -+ if (exp == NULL) -+ FAIL("NULL argument"); -+ -+ /* First pass: determine size, legality. */ -+ g.regparse = exp; -+ g.regnpar = 1; -+ g.regsize = 0L; -+ g.regcode = &g.regdummy; -+ regc(&g, MAGIC); -+ if (reg(&g, 0, &flags) == NULL) -+ return(NULL); -+ -+ /* Small enough for pointer-storage convention? */ -+ if (g.regsize >= 32767L) /* Probably could be 65535L. */ -+ FAIL("regexp too big"); -+ -+ /* Allocate space. */ -+ *patternsize=sizeof(regexp) + (unsigned)g.regsize; -+ r = (regexp *)malloc(sizeof(regexp) + (unsigned)g.regsize); -+ if (r == NULL) -+ FAIL("out of space"); -+ -+ /* Second pass: emit code. */ -+ g.regparse = exp; -+ g.regnpar = 1; -+ g.regcode = r->program; -+ regc(&g, MAGIC); -+ if (reg(&g, 0, &flags) == NULL) -+ return(NULL); -+ -+ /* Dig out information for optimizations. */ -+ r->regstart = '\0'; /* Worst-case defaults. */ -+ r->reganch = 0; -+ r->regmust = NULL; -+ r->regmlen = 0; -+ scan = r->program+1; /* First BRANCH. */ -+ if (OP(regnext(&g, scan)) == END) { /* Only one top-level choice. */ -+ scan = OPERAND(scan); -+ -+ /* Starting-point info. */ -+ if (OP(scan) == EXACTLY) -+ r->regstart = *OPERAND(scan); -+ else if (OP(scan) == BOL) -+ r->reganch++; -+ -+ /* -+ * If there's something expensive in the r.e., find the -+ * longest literal string that must appear and make it the -+ * regmust. Resolve ties in favor of later strings, since -+ * the regstart check works with the beginning of the r.e. -+ * and avoiding duplication strengthens checking. Not a -+ * strong reason, but sufficient in the absence of others. -+ */ -+ if (flags&SPSTART) { -+ longest = NULL; -+ len = 0; -+ for (; scan != NULL; scan = regnext(&g, scan)) -+ if (OP(scan) == EXACTLY && strlen(OPERAND(scan)) >= len) { -+ longest = OPERAND(scan); -+ len = strlen(OPERAND(scan)); -+ } -+ r->regmust = longest; -+ r->regmlen = len; -+ } -+ } -+ -+ return(r); -+} -+ -+/* -+ - reg - regular expression, i.e. main body or parenthesized thing -+ * -+ * Caller must absorb opening parenthesis. -+ * -+ * Combining parenthesis handling with the base level of regular expression -+ * is a trifle forced, but the need to tie the tails of the branches to what -+ * follows makes it hard to avoid. -+ */ -+static char * -+reg(struct match_globals *g, int paren, int *flagp /* Parenthesized? */ ) -+{ -+ register char *ret; -+ register char *br; -+ register char *ender; -+ register int parno = 0; /* 0 makes gcc happy */ -+ int flags; -+ -+ *flagp = HASWIDTH; /* Tentatively. */ -+ -+ /* Make an OPEN node, if parenthesized. */ -+ if (paren) { -+ if (g->regnpar >= NSUBEXP) -+ FAIL("too many ()"); -+ parno = g->regnpar; -+ g->regnpar++; -+ ret = regnode(g, OPEN+parno); -+ } else -+ ret = NULL; -+ -+ /* Pick up the branches, linking them together. */ -+ br = regbranch(g, &flags); -+ if (br == NULL) -+ return(NULL); -+ if (ret != NULL) -+ regtail(g, ret, br); /* OPEN -> first. */ -+ else -+ ret = br; -+ if (!(flags&HASWIDTH)) -+ *flagp &= ~HASWIDTH; -+ *flagp |= flags&SPSTART; -+ while (*g->regparse == '|') { -+ g->regparse++; -+ br = regbranch(g, &flags); -+ if (br == NULL) -+ return(NULL); -+ regtail(g, ret, br); /* BRANCH -> BRANCH. */ -+ if (!(flags&HASWIDTH)) -+ *flagp &= ~HASWIDTH; -+ *flagp |= flags&SPSTART; -+ } -+ -+ /* Make a closing node, and hook it on the end. */ -+ ender = regnode(g, (paren) ? CLOSE+parno : END); -+ regtail(g, ret, ender); -+ -+ /* Hook the tails of the branches to the closing node. */ -+ for (br = ret; br != NULL; br = regnext(g, br)) -+ regoptail(g, br, ender); -+ -+ /* Check for proper termination. */ -+ if (paren && *g->regparse++ != ')') { -+ FAIL("unmatched ()"); -+ } else if (!paren && *g->regparse != '\0') { -+ if (*g->regparse == ')') { -+ FAIL("unmatched ()"); -+ } else -+ FAIL("junk on end"); /* "Can't happen". */ -+ /* NOTREACHED */ -+ } -+ -+ return(ret); -+} -+ -+/* -+ - regbranch - one alternative of an | operator -+ * -+ * Implements the concatenation operator. -+ */ -+static char * -+regbranch(struct match_globals *g, int *flagp) -+{ -+ register char *ret; -+ register char *chain; -+ register char *latest; -+ int flags; -+ -+ *flagp = WORST; /* Tentatively. */ -+ -+ ret = regnode(g, BRANCH); -+ chain = NULL; -+ while (*g->regparse != '\0' && *g->regparse != '|' && *g->regparse != ')') { -+ latest = regpiece(g, &flags); -+ if (latest == NULL) -+ return(NULL); -+ *flagp |= flags&HASWIDTH; -+ if (chain == NULL) /* First piece. */ -+ *flagp |= flags&SPSTART; -+ else -+ regtail(g, chain, latest); -+ chain = latest; -+ } -+ if (chain == NULL) /* Loop ran zero times. */ -+ (void) regnode(g, NOTHING); -+ -+ return(ret); -+} -+ -+/* -+ - regpiece - something followed by possible [*+?] -+ * -+ * Note that the branching code sequences used for ? and the general cases -+ * of * and + are somewhat optimized: they use the same NOTHING node as -+ * both the endmarker for their branch list and the body of the last branch. -+ * It might seem that this node could be dispensed with entirely, but the -+ * endmarker role is not redundant. -+ */ -+static char * -+regpiece(struct match_globals *g, int *flagp) -+{ -+ register char *ret; -+ register char op; -+ register char *next; -+ int flags; -+ -+ ret = regatom(g, &flags); -+ if (ret == NULL) -+ return(NULL); -+ -+ op = *g->regparse; -+ if (!ISMULT(op)) { -+ *flagp = flags; -+ return(ret); -+ } -+ -+ if (!(flags&HASWIDTH) && op != '?') -+ FAIL("*+ operand could be empty"); -+ *flagp = (op != '+') ? (WORST|SPSTART) : (WORST|HASWIDTH); -+ -+ if (op == '*' && (flags&SIMPLE)) -+ reginsert(g, STAR, ret); -+ else if (op == '*') { -+ /* Emit x* as (x&|), where & means "self". */ -+ reginsert(g, BRANCH, ret); /* Either x */ -+ regoptail(g, ret, regnode(g, BACK)); /* and loop */ -+ regoptail(g, ret, ret); /* back */ -+ regtail(g, ret, regnode(g, BRANCH)); /* or */ -+ regtail(g, ret, regnode(g, NOTHING)); /* null. */ -+ } else if (op == '+' && (flags&SIMPLE)) -+ reginsert(g, PLUS, ret); -+ else if (op == '+') { -+ /* Emit x+ as x(&|), where & means "self". */ -+ next = regnode(g, BRANCH); /* Either */ -+ regtail(g, ret, next); -+ regtail(g, regnode(g, BACK), ret); /* loop back */ -+ regtail(g, next, regnode(g, BRANCH)); /* or */ -+ regtail(g, ret, regnode(g, NOTHING)); /* null. */ -+ } else if (op == '?') { -+ /* Emit x? as (x|) */ -+ reginsert(g, BRANCH, ret); /* Either x */ -+ regtail(g, ret, regnode(g, BRANCH)); /* or */ -+ next = regnode(g, NOTHING); /* null. */ -+ regtail(g, ret, next); -+ regoptail(g, ret, next); -+ } -+ g->regparse++; -+ if (ISMULT(*g->regparse)) -+ FAIL("nested *?+"); -+ -+ return(ret); -+} -+ -+/* -+ - regatom - the lowest level -+ * -+ * Optimization: gobbles an entire sequence of ordinary characters so that -+ * it can turn them into a single node, which is smaller to store and -+ * faster to run. Backslashed characters are exceptions, each becoming a -+ * separate node; the code is simpler that way and it's not worth fixing. -+ */ -+static char * -+regatom(struct match_globals *g, int *flagp) -+{ -+ register char *ret; -+ int flags; -+ -+ *flagp = WORST; /* Tentatively. */ -+ -+ switch (*g->regparse++) { -+ case '^': -+ ret = regnode(g, BOL); -+ break; -+ case '$': -+ ret = regnode(g, EOL); -+ break; -+ case '.': -+ ret = regnode(g, ANY); -+ *flagp |= HASWIDTH|SIMPLE; -+ break; -+ case '[': { -+ register int class; -+ register int classend; -+ -+ if (*g->regparse == '^') { /* Complement of range. */ -+ ret = regnode(g, ANYBUT); -+ g->regparse++; -+ } else -+ ret = regnode(g, ANYOF); -+ if (*g->regparse == ']' || *g->regparse == '-') -+ regc(g, *g->regparse++); -+ while (*g->regparse != '\0' && *g->regparse != ']') { -+ if (*g->regparse == '-') { -+ g->regparse++; -+ if (*g->regparse == ']' || *g->regparse == '\0') -+ regc(g, '-'); -+ else { -+ class = UCHARAT(g->regparse-2)+1; -+ classend = UCHARAT(g->regparse); -+ if (class > classend+1) -+ FAIL("invalid [] range"); -+ for (; class <= classend; class++) -+ regc(g, class); -+ g->regparse++; -+ } -+ } else -+ regc(g, *g->regparse++); -+ } -+ regc(g, '\0'); -+ if (*g->regparse != ']') -+ FAIL("unmatched []"); -+ g->regparse++; -+ *flagp |= HASWIDTH|SIMPLE; -+ } -+ break; -+ case '(': -+ ret = reg(g, 1, &flags); -+ if (ret == NULL) -+ return(NULL); -+ *flagp |= flags&(HASWIDTH|SPSTART); -+ break; -+ case '\0': -+ case '|': -+ case ')': -+ FAIL("internal urp"); /* Supposed to be caught earlier. */ -+ break; -+ case '?': -+ case '+': -+ case '*': -+ FAIL("?+* follows nothing"); -+ break; -+ case '\\': -+ if (*g->regparse == '\0') -+ FAIL("trailing \\"); -+ ret = regnode(g, EXACTLY); -+ regc(g, *g->regparse++); -+ regc(g, '\0'); -+ *flagp |= HASWIDTH|SIMPLE; -+ break; -+ default: { -+ register int len; -+ register char ender; -+ -+ g->regparse--; -+ len = my_strcspn((const char *)g->regparse, (const char *)META); -+ if (len <= 0) -+ FAIL("internal disaster"); -+ ender = *(g->regparse+len); -+ if (len > 1 && ISMULT(ender)) -+ len--; /* Back off clear of ?+* operand. */ -+ *flagp |= HASWIDTH; -+ if (len == 1) -+ *flagp |= SIMPLE; -+ ret = regnode(g, EXACTLY); -+ while (len > 0) { -+ regc(g, *g->regparse++); -+ len--; -+ } -+ regc(g, '\0'); -+ } -+ break; -+ } -+ -+ return(ret); -+} -+ -+/* -+ - regnode - emit a node -+ */ -+static char * /* Location. */ -+regnode(struct match_globals *g, char op) -+{ -+ register char *ret; -+ register char *ptr; -+ -+ ret = g->regcode; -+ if (ret == &g->regdummy) { -+ g->regsize += 3; -+ return(ret); -+ } -+ -+ ptr = ret; -+ *ptr++ = op; -+ *ptr++ = '\0'; /* Null "next" pointer. */ -+ *ptr++ = '\0'; -+ g->regcode = ptr; -+ -+ return(ret); -+} -+ -+/* -+ - regc - emit (if appropriate) a byte of code -+ */ -+static void -+regc(struct match_globals *g, char b) -+{ -+ if (g->regcode != &g->regdummy) -+ *g->regcode++ = b; -+ else -+ g->regsize++; -+} -+ -+/* -+ - reginsert - insert an operator in front of already-emitted operand -+ * -+ * Means relocating the operand. -+ */ -+static void -+reginsert(struct match_globals *g, char op, char* opnd) -+{ -+ register char *src; -+ register char *dst; -+ register char *place; -+ -+ if (g->regcode == &g->regdummy) { -+ g->regsize += 3; -+ return; -+ } -+ -+ src = g->regcode; -+ g->regcode += 3; -+ dst = g->regcode; -+ while (src > opnd) -+ *--dst = *--src; -+ -+ place = opnd; /* Op node, where operand used to be. */ -+ *place++ = op; -+ *place++ = '\0'; -+ *place++ = '\0'; -+} -+ -+/* -+ - regtail - set the next-pointer at the end of a node chain -+ */ -+static void -+regtail(struct match_globals *g, char *p, char *val) -+{ -+ register char *scan; -+ register char *temp; -+ register int offset; -+ -+ if (p == &g->regdummy) -+ return; -+ -+ /* Find last node. */ -+ scan = p; -+ for (;;) { -+ temp = regnext(g, scan); -+ if (temp == NULL) -+ break; -+ scan = temp; -+ } -+ -+ if (OP(scan) == BACK) -+ offset = scan - val; -+ else -+ offset = val - scan; -+ *(scan+1) = (offset>>8)&0377; -+ *(scan+2) = offset&0377; -+} -+ -+/* -+ - regoptail - regtail on operand of first argument; nop if operandless -+ */ -+static void -+regoptail(struct match_globals *g, char *p, char *val) -+{ -+ /* "Operandless" and "op != BRANCH" are synonymous in practice. */ -+ if (p == NULL || p == &g->regdummy || OP(p) != BRANCH) -+ return; -+ regtail(g, OPERAND(p), val); -+} -+ -+/* -+ * regexec and friends -+ */ -+ -+ -+/* -+ * Forwards. -+ */ -+STATIC int regtry(struct match_globals *g, regexp *prog, char *string); -+STATIC int regmatch(struct match_globals *g, char *prog); -+STATIC int regrepeat(struct match_globals *g, char *p); -+ -+#ifdef DEBUG -+int regnarrate = 0; -+void regdump(); -+STATIC char *regprop(char *op); -+#endif -+ -+/* -+ - regexec - match a regexp against a string -+ */ -+int -+regexec(regexp *prog, char *string) -+{ -+ register char *s; -+ struct match_globals g; -+ -+ /* Be paranoid... */ -+ if (prog == NULL || string == NULL) { -+ printk("<3>Regexp: NULL parameter\n"); -+ return(0); -+ } -+ -+ /* Check validity of program. */ -+ if (UCHARAT(prog->program) != MAGIC) { -+ printk("<3>Regexp: corrupted program\n"); -+ return(0); -+ } -+ -+ /* If there is a "must appear" string, look for it. */ -+ if (prog->regmust != NULL) { -+ s = string; -+ while ((s = strchr(s, prog->regmust[0])) != NULL) { -+ if (strncmp(s, prog->regmust, prog->regmlen) == 0) -+ break; /* Found it. */ -+ s++; -+ } -+ if (s == NULL) /* Not present. */ -+ return(0); -+ } -+ -+ /* Mark beginning of line for ^ . */ -+ g.regbol = string; -+ -+ /* Simplest case: anchored match need be tried only once. */ -+ if (prog->reganch) -+ return(regtry(&g, prog, string)); -+ -+ /* Messy cases: unanchored match. */ -+ s = string; -+ if (prog->regstart != '\0') -+ /* We know what char it must start with. */ -+ while ((s = strchr(s, prog->regstart)) != NULL) { -+ if (regtry(&g, prog, s)) -+ return(1); -+ s++; -+ } -+ else -+ /* We don't -- general case. */ -+ do { -+ if (regtry(&g, prog, s)) -+ return(1); -+ } while (*s++ != '\0'); -+ -+ /* Failure. */ -+ return(0); -+} -+ -+/* -+ - regtry - try match at specific point -+ */ -+static int /* 0 failure, 1 success */ -+regtry(struct match_globals *g, regexp *prog, char *string) -+{ -+ register int i; -+ register char **sp; -+ register char **ep; -+ -+ g->reginput = string; -+ g->regstartp = prog->startp; -+ g->regendp = prog->endp; -+ -+ sp = prog->startp; -+ ep = prog->endp; -+ for (i = NSUBEXP; i > 0; i--) { -+ *sp++ = NULL; -+ *ep++ = NULL; -+ } -+ if (regmatch(g, prog->program + 1)) { -+ prog->startp[0] = string; -+ prog->endp[0] = g->reginput; -+ return(1); -+ } else -+ return(0); -+} -+ -+/* -+ - regmatch - main matching routine -+ * -+ * Conceptually the strategy is simple: check to see whether the current -+ * node matches, call self recursively to see whether the rest matches, -+ * and then act accordingly. In practice we make some effort to avoid -+ * recursion, in particular by going through "ordinary" nodes (that don't -+ * need to know whether the rest of the match failed) by a loop instead of -+ * by recursion. -+ */ -+static int /* 0 failure, 1 success */ -+regmatch(struct match_globals *g, char *prog) -+{ -+ register char *scan = prog; /* Current node. */ -+ char *next; /* Next node. */ -+ -+#ifdef DEBUG -+ if (scan != NULL && regnarrate) -+ fprintf(stderr, "%s(\n", regprop(scan)); -+#endif -+ while (scan != NULL) { -+#ifdef DEBUG -+ if (regnarrate) -+ fprintf(stderr, "%s...\n", regprop(scan)); -+#endif -+ next = regnext(g, scan); -+ -+ switch (OP(scan)) { -+ case BOL: -+ if (g->reginput != g->regbol) -+ return(0); -+ break; -+ case EOL: -+ if (*g->reginput != '\0') -+ return(0); -+ break; -+ case ANY: -+ if (*g->reginput == '\0') -+ return(0); -+ g->reginput++; -+ break; -+ case EXACTLY: { -+ register int len; -+ register char *opnd; -+ -+ opnd = OPERAND(scan); -+ /* Inline the first character, for speed. */ -+ if (*opnd != *g->reginput) -+ return(0); -+ len = strlen(opnd); -+ if (len > 1 && strncmp(opnd, g->reginput, len) != 0) -+ return(0); -+ g->reginput += len; -+ } -+ break; -+ case ANYOF: -+ if (*g->reginput == '\0' || strchr(OPERAND(scan), *g->reginput) == NULL) -+ return(0); -+ g->reginput++; -+ break; -+ case ANYBUT: -+ if (*g->reginput == '\0' || strchr(OPERAND(scan), *g->reginput) != NULL) -+ return(0); -+ g->reginput++; -+ break; -+ case NOTHING: -+ case BACK: -+ break; -+ case OPEN+1: -+ case OPEN+2: -+ case OPEN+3: -+ case OPEN+4: -+ case OPEN+5: -+ case OPEN+6: -+ case OPEN+7: -+ case OPEN+8: -+ case OPEN+9: { -+ register int no; -+ register char *save; -+ -+ no = OP(scan) - OPEN; -+ save = g->reginput; -+ -+ if (regmatch(g, next)) { -+ /* -+ * Don't set startp if some later -+ * invocation of the same parentheses -+ * already has. -+ */ -+ if (g->regstartp[no] == NULL) -+ g->regstartp[no] = save; -+ return(1); -+ } else -+ return(0); -+ } -+ break; -+ case CLOSE+1: -+ case CLOSE+2: -+ case CLOSE+3: -+ case CLOSE+4: -+ case CLOSE+5: -+ case CLOSE+6: -+ case CLOSE+7: -+ case CLOSE+8: -+ case CLOSE+9: -+ { -+ register int no; -+ register char *save; -+ -+ no = OP(scan) - CLOSE; -+ save = g->reginput; -+ -+ if (regmatch(g, next)) { -+ /* -+ * Don't set endp if some later -+ * invocation of the same parentheses -+ * already has. -+ */ -+ if (g->regendp[no] == NULL) -+ g->regendp[no] = save; -+ return(1); -+ } else -+ return(0); -+ } -+ break; -+ case BRANCH: { -+ register char *save; -+ -+ if (OP(next) != BRANCH) /* No choice. */ -+ next = OPERAND(scan); /* Avoid recursion. */ -+ else { -+ do { -+ save = g->reginput; -+ if (regmatch(g, OPERAND(scan))) -+ return(1); -+ g->reginput = save; -+ scan = regnext(g, scan); -+ } while (scan != NULL && OP(scan) == BRANCH); -+ return(0); -+ /* NOTREACHED */ -+ } -+ } -+ break; -+ case STAR: -+ case PLUS: { -+ register char nextch; -+ register int no; -+ register char *save; -+ register int min; -+ -+ /* -+ * Lookahead to avoid useless match attempts -+ * when we know what character comes next. -+ */ -+ nextch = '\0'; -+ if (OP(next) == EXACTLY) -+ nextch = *OPERAND(next); -+ min = (OP(scan) == STAR) ? 0 : 1; -+ save = g->reginput; -+ no = regrepeat(g, OPERAND(scan)); -+ while (no >= min) { -+ /* If it could work, try it. */ -+ if (nextch == '\0' || *g->reginput == nextch) -+ if (regmatch(g, next)) -+ return(1); -+ /* Couldn't or didn't -- back up. */ -+ no--; -+ g->reginput = save + no; -+ } -+ return(0); -+ } -+ break; -+ case END: -+ return(1); /* Success! */ -+ break; -+ default: -+ printk("<3>Regexp: memory corruption\n"); -+ return(0); -+ break; -+ } -+ -+ scan = next; -+ } -+ -+ /* -+ * We get here only if there's trouble -- normally "case END" is -+ * the terminating point. -+ */ -+ printk("<3>Regexp: corrupted pointers\n"); -+ return(0); -+} -+ -+/* -+ - regrepeat - repeatedly match something simple, report how many -+ */ -+static int -+regrepeat(struct match_globals *g, char *p) -+{ -+ register int count = 0; -+ register char *scan; -+ register char *opnd; -+ -+ scan = g->reginput; -+ opnd = OPERAND(p); -+ switch (OP(p)) { -+ case ANY: -+ count = strlen(scan); -+ scan += count; -+ break; -+ case EXACTLY: -+ while (*opnd == *scan) { -+ count++; -+ scan++; -+ } -+ break; -+ case ANYOF: -+ while (*scan != '\0' && strchr(opnd, *scan) != NULL) { -+ count++; -+ scan++; -+ } -+ break; -+ case ANYBUT: -+ while (*scan != '\0' && strchr(opnd, *scan) == NULL) { -+ count++; -+ scan++; -+ } -+ break; -+ default: /* Oh dear. Called inappropriately. */ -+ printk("<3>Regexp: internal foulup\n"); -+ count = 0; /* Best compromise. */ -+ break; -+ } -+ g->reginput = scan; -+ -+ return(count); -+} -+ -+/* -+ - regnext - dig the "next" pointer out of a node -+ */ -+static char* -+regnext(struct match_globals *g, char *p) -+{ -+ register int offset; -+ -+ if (p == &g->regdummy) -+ return(NULL); -+ -+ offset = NEXT(p); -+ if (offset == 0) -+ return(NULL); -+ -+ if (OP(p) == BACK) -+ return(p-offset); -+ else -+ return(p+offset); -+} -+ -+#ifdef DEBUG -+ -+STATIC char *regprop(); -+ -+/* -+ - regdump - dump a regexp onto stdout in vaguely comprehensible form -+ */ -+void -+regdump(regexp *r) -+{ -+ register char *s; -+ register char op = EXACTLY; /* Arbitrary non-END op. */ -+ register char *next; -+ /* extern char *strchr(); */ -+ -+ -+ s = r->program + 1; -+ while (op != END) { /* While that wasn't END last time... */ -+ op = OP(s); -+ printf("%2d%s", s-r->program, regprop(s)); /* Where, what. */ -+ next = regnext(s); -+ if (next == NULL) /* Next ptr. */ -+ printf("(0)"); -+ else -+ printf("(%d)", (s-r->program)+(next-s)); -+ s += 3; -+ if (op == ANYOF || op == ANYBUT || op == EXACTLY) { -+ /* Literal string, where present. */ -+ while (*s != '\0') { -+ putchar(*s); -+ s++; -+ } -+ s++; -+ } -+ putchar('\n'); -+ } -+ -+ /* Header fields of interest. */ -+ if (r->regstart != '\0') -+ printf("start `%c' ", r->regstart); -+ if (r->reganch) -+ printf("anchored "); -+ if (r->regmust != NULL) -+ printf("must have \"%s\"", r->regmust); -+ printf("\n"); -+} -+ -+/* -+ - regprop - printable representation of opcode -+ */ -+static char * -+regprop(char *op) -+{ -+#define BUFLEN 50 -+ register char *p; -+ static char buf[BUFLEN]; -+ -+ strcpy(buf, ":"); -+ -+ switch (OP(op)) { -+ case BOL: -+ p = "BOL"; -+ break; -+ case EOL: -+ p = "EOL"; -+ break; -+ case ANY: -+ p = "ANY"; -+ break; -+ case ANYOF: -+ p = "ANYOF"; -+ break; -+ case ANYBUT: -+ p = "ANYBUT"; -+ break; -+ case BRANCH: -+ p = "BRANCH"; -+ break; -+ case EXACTLY: -+ p = "EXACTLY"; -+ break; -+ case NOTHING: -+ p = "NOTHING"; -+ break; -+ case BACK: -+ p = "BACK"; -+ break; -+ case END: -+ p = "END"; -+ break; -+ case OPEN+1: -+ case OPEN+2: -+ case OPEN+3: -+ case OPEN+4: -+ case OPEN+5: -+ case OPEN+6: -+ case OPEN+7: -+ case OPEN+8: -+ case OPEN+9: -+ snprintf(buf+strlen(buf),BUFLEN-strlen(buf), "OPEN%d", OP(op)-OPEN); -+ p = NULL; -+ break; -+ case CLOSE+1: -+ case CLOSE+2: -+ case CLOSE+3: -+ case CLOSE+4: -+ case CLOSE+5: -+ case CLOSE+6: -+ case CLOSE+7: -+ case CLOSE+8: -+ case CLOSE+9: -+ snprintf(buf+strlen(buf),BUFLEN-strlen(buf), "CLOSE%d", OP(op)-CLOSE); -+ p = NULL; -+ break; -+ case STAR: -+ p = "STAR"; -+ break; -+ case PLUS: -+ p = "PLUS"; -+ break; -+ default: -+ printk("<3>Regexp: corrupted opcode\n"); -+ break; -+ } -+ if (p != NULL) -+ strncat(buf, p, BUFLEN-strlen(buf)); -+ return(buf); -+} -+#endif -+ -+ ---- /dev/null -+++ b/net/netfilter/regexp/regexp.h -@@ -0,0 +1,41 @@ -+/* -+ * Definitions etc. for regexp(3) routines. -+ * -+ * Caveat: this is V8 regexp(3) [actually, a reimplementation thereof], -+ * not the System V one. -+ */ -+ -+#ifndef REGEXP_H -+#define REGEXP_H -+ -+ -+/* -+http://www.opensource.apple.com/darwinsource/10.3/expect-1/expect/expect.h , -+which contains a version of this library, says: -+ -+ * -+ * NSUBEXP must be at least 10, and no greater than 117 or the parser -+ * will not work properly. -+ * -+ -+However, it looks rather like this library is limited to 10. If you think -+otherwise, let us know. -+*/ -+ -+#define NSUBEXP 10 -+typedef struct regexp { -+ char *startp[NSUBEXP]; -+ char *endp[NSUBEXP]; -+ char regstart; /* Internal use only. */ -+ char reganch; /* Internal use only. */ -+ char *regmust; /* Internal use only. */ -+ int regmlen; /* Internal use only. */ -+ char program[1]; /* Unwarranted chumminess with compiler. */ -+} regexp; -+ -+regexp * regcomp(char *exp, int *patternsize); -+int regexec(regexp *prog, char *string); -+void regsub(regexp *prog, char *source, char *dest); -+void regerror(char *s); -+ -+#endif ---- /dev/null -+++ b/net/netfilter/regexp/regmagic.h -@@ -0,0 +1,5 @@ -+/* -+ * The first byte of the regexp internal "program" is actually this magic -+ * number; the start node begins in the second byte. -+ */ -+#define MAGIC 0234 ---- /dev/null -+++ b/net/netfilter/regexp/regsub.c -@@ -0,0 +1,95 @@ -+/* -+ * regsub -+ * @(#)regsub.c 1.3 of 2 April 86 -+ * -+ * Copyright (c) 1986 by University of Toronto. -+ * Written by Henry Spencer. Not derived from licensed software. -+ * -+ * Permission is granted to anyone to use this software for any -+ * purpose on any computer system, and to redistribute it freely, -+ * subject to the following restrictions: -+ * -+ * 1. The author is not responsible for the consequences of use of -+ * this software, no matter how awful, even if they arise -+ * from defects in it. -+ * -+ * 2. The origin of this software must not be misrepresented, either -+ * by explicit claim or by omission. -+ * -+ * 3. Altered versions must be plainly marked as such, and must not -+ * be misrepresented as being the original software. -+ * -+ * -+ * This code was modified by Ethan Sommer to work within the kernel -+ * (it now uses kmalloc etc..) -+ * -+ */ -+#include "regexp.h" -+#include "regmagic.h" -+#include <linux/string.h> -+ -+ -+#ifndef CHARBITS -+#define UCHARAT(p) ((int)*(unsigned char *)(p)) -+#else -+#define UCHARAT(p) ((int)*(p)&CHARBITS) -+#endif -+ -+#if 0 -+//void regerror(char * s) -+//{ -+// printk("regexp(3): %s", s); -+// /* NOTREACHED */ -+//} -+#endif -+ -+/* -+ - regsub - perform substitutions after a regexp match -+ */ -+void -+regsub(regexp * prog, char * source, char * dest) -+{ -+ register char *src; -+ register char *dst; -+ register char c; -+ register int no; -+ register int len; -+ -+ /* Not necessary and gcc doesn't like it -MLS */ -+ /*extern char *strncpy();*/ -+ -+ if (prog == NULL || source == NULL || dest == NULL) { -+ regerror("NULL parm to regsub"); -+ return; -+ } -+ if (UCHARAT(prog->program) != MAGIC) { -+ regerror("damaged regexp fed to regsub"); -+ return; -+ } -+ -+ src = source; -+ dst = dest; -+ while ((c = *src++) != '\0') { -+ if (c == '&') -+ no = 0; -+ else if (c == '\\' && '0' <= *src && *src <= '9') -+ no = *src++ - '0'; -+ else -+ no = -1; -+ -+ if (no < 0) { /* Ordinary character. */ -+ if (c == '\\' && (*src == '\\' || *src == '&')) -+ c = *src++; -+ *dst++ = c; -+ } else if (prog->startp[no] != NULL && prog->endp[no] != NULL) { -+ len = prog->endp[no] - prog->startp[no]; -+ (void) strncpy(dst, prog->startp[no], len); -+ dst += len; -+ if (len != 0 && *(dst-1) == '\0') { /* strncpy hit NUL. */ -+ regerror("damaged match string"); -+ return; -+ } -+ } -+ } -+ *dst++ = '\0'; -+} ---- a/net/netfilter/nf_conntrack_core.c -+++ b/net/netfilter/nf_conntrack_core.c -@@ -208,6 +208,14 @@ destroy_conntrack(struct nf_conntrack *n - * too. */ - nf_ct_remove_expectations(ct); - -+ #if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE) -+ if(ct->layer7.app_proto) -+ kfree(ct->layer7.app_proto); -+ if(ct->layer7.app_data) -+ kfree(ct->layer7.app_data); -+ #endif -+ -+ - /* We overload first tuple to link into unconfirmed list. */ - if (!nf_ct_is_confirmed(ct)) { - BUG_ON(hlist_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode)); ---- a/net/netfilter/nf_conntrack_standalone.c -+++ b/net/netfilter/nf_conntrack_standalone.c -@@ -181,7 +181,12 @@ static int ct_seq_show(struct seq_file * - return -ENOSPC; - #endif - -- if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use))) -+#if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE) -+ if(ct->layer7.app_proto) -+ if(seq_printf(s, "l7proto=%s ", ct->layer7.app_proto)) -+ return -ENOSPC; -+#endif -+ if (seq_printf(s, "asdfuse=%u\n", atomic_read(&ct->ct_general.use))) - return -ENOSPC; - - return 0; ---- a/include/net/netfilter/nf_conntrack.h -+++ b/include/net/netfilter/nf_conntrack.h -@@ -124,6 +124,22 @@ struct nf_conn - u_int32_t secmark; - #endif - -+#if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || \ -+ defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE) -+ struct { -+ /* -+ * e.g. "http". NULL before decision. "unknown" after decision -+ * if no match. -+ */ -+ char *app_proto; -+ /* -+ * application layer data so far. NULL after match decision. -+ */ -+ char *app_data; -+ unsigned int app_data_len; -+ } layer7; -+#endif -+ - /* Storage reserved for other modules: */ - union nf_conntrack_proto proto; - ---- /dev/null -+++ b/include/linux/netfilter/xt_layer7.h -@@ -0,0 +1,13 @@ -+#ifndef _XT_LAYER7_H -+#define _XT_LAYER7_H -+ -+#define MAX_PATTERN_LEN 8192 -+#define MAX_PROTOCOL_LEN 256 -+ -+struct xt_layer7_info { -+ char protocol[MAX_PROTOCOL_LEN]; -+ char pattern[MAX_PATTERN_LEN]; -+ u_int8_t invert; -+}; -+ -+#endif /* _XT_LAYER7_H */ |