backport multiport stuff from 2.6 to 2.4 (disable rev0 support in iptables itself, only use the new stuff)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@3125 3c298f89-4303-0410-b956-a3cf2f4a3e73

2 files changed, 463 insertions, 0 deletions

diff --git a/package/iptables/patches/04-multiport_v1.patch b/package/iptables/patches/04-multiport_v1.patch
new file mode 100644
index 000000000..90b5144c7
--- /dev/null
+++ b/package/iptables/patches/04-multiport_v1.patch
@@ -0,0 +1,221 @@
+diff -urN iptables.old/extensions/libipt_multiport.c iptables.dev/extensions/libipt_multiport.c
+--- iptables.old/extensions/libipt_multiport.c	2005-02-19 20:19:17.000000000 +0100
++++ iptables.dev/extensions/libipt_multiport.c	2006-02-04 05:46:12.154127750 +0100
+@@ -8,24 +8,6 @@
+ /* To ensure that iptables compiles with an old kernel */
+ #include "../include/linux/netfilter_ipv4/ipt_multiport.h"
+ 
+-/* Function which prints out usage message. */
+-static void
+-help(void)
+-{
+-	printf(
+-"multiport v%s options:\n"
+-" --source-ports port[,port,port...]\n"
+-" --sports ...\n"
+-"				match source port(s)\n"
+-" --destination-ports port[,port,port...]\n"
+-" --dports ...\n"
+-"				match destination port(s)\n"
+-" --ports port[,port,port]\n"
+-"				match both source and destination port(s)\n"
+-" NOTE: this kernel does not support port ranges in multiport.\n",
+-IPTABLES_VERSION);
+-}
+-
+ static void
+ help_v1(void)
+ {
+@@ -75,26 +57,6 @@
+ 		   "invalid port/service `%s' specified", port);
+ }
+ 
+-static unsigned int
+-parse_multi_ports(const char *portstring, u_int16_t *ports, const char *proto)
+-{
+-	char *buffer, *cp, *next;
+-	unsigned int i;
+-
+-	buffer = strdup(portstring);
+-	if (!buffer) exit_error(OTHER_PROBLEM, "strdup failed");
+-
+-	for (cp=buffer, i=0; cp && i<IPT_MULTI_PORTS; cp=next,i++)
+-	{
+-		next=strchr(cp, ',');
+-		if (next) *next++='\0';
+-		ports[i] = parse_port(cp, proto);
+-	}
+-	if (cp) exit_error(PARAMETER_PROBLEM, "too many ports specified");
+-	free(buffer);
+-	return i;
+-}
+-
+ static void
+ parse_multi_ports_v1(const char *portstring, 
+ 		     struct ipt_multiport_v1 *multiinfo,
+@@ -160,58 +122,6 @@
+ 			   "multiport only works with TCP or UDP");
+ }
+ 
+-/* Function which parses command options; returns true if it
+-   ate an option */
+-static int
+-parse(int c, char **argv, int invert, unsigned int *flags,
+-      const struct ipt_entry *entry,
+-      unsigned int *nfcache,
+-      struct ipt_entry_match **match)
+-{
+-	const char *proto;
+-	struct ipt_multiport *multiinfo
+-		= (struct ipt_multiport *)(*match)->data;
+-
+-	switch (c) {
+-	case '1':
+-		check_inverse(argv[optind-1], &invert, &optind, 0);
+-		proto = check_proto(entry);
+-		multiinfo->count = parse_multi_ports(argv[optind-1],
+-						     multiinfo->ports, proto);
+-		multiinfo->flags = IPT_MULTIPORT_SOURCE;
+-		break;
+-
+-	case '2':
+-		check_inverse(argv[optind-1], &invert, &optind, 0);
+-		proto = check_proto(entry);
+-		multiinfo->count = parse_multi_ports(argv[optind-1],
+-						     multiinfo->ports, proto);
+-		multiinfo->flags = IPT_MULTIPORT_DESTINATION;
+-		break;
+-
+-	case '3':
+-		check_inverse(argv[optind-1], &invert, &optind, 0);
+-		proto = check_proto(entry);
+-		multiinfo->count = parse_multi_ports(argv[optind-1],
+-						     multiinfo->ports, proto);
+-		multiinfo->flags = IPT_MULTIPORT_EITHER;
+-		break;
+-
+-	default:
+-		return 0;
+-	}
+-
+-	if (invert)
+-		exit_error(PARAMETER_PROBLEM,
+-			   "multiport does not support invert");
+-
+-	if (*flags)
+-		exit_error(PARAMETER_PROBLEM,
+-			   "multiport can only have one option");
+-	*flags = 1;
+-	return 1;
+-}
+-
+ static int
+ parse_v1(int c, char **argv, int invert, unsigned int *flags,
+ 	 const struct ipt_entry *entry,
+@@ -289,43 +199,6 @@
+ 		printf("%s", service);
+ }
+ 
+-/* Prints out the matchinfo. */
+-static void
+-print(const struct ipt_ip *ip,
+-      const struct ipt_entry_match *match,
+-      int numeric)
+-{
+-	const struct ipt_multiport *multiinfo
+-		= (const struct ipt_multiport *)match->data;
+-	unsigned int i;
+-
+-	printf("multiport ");
+-
+-	switch (multiinfo->flags) {
+-	case IPT_MULTIPORT_SOURCE:
+-		printf("sports ");
+-		break;
+-
+-	case IPT_MULTIPORT_DESTINATION:
+-		printf("dports ");
+-		break;
+-
+-	case IPT_MULTIPORT_EITHER:
+-		printf("ports ");
+-		break;
+-
+-	default:
+-		printf("ERROR ");
+-		break;
+-	}
+-
+-	for (i=0; i < multiinfo->count; i++) {
+-		printf("%s", i ? "," : "");
+-		print_port(multiinfo->ports[i], ip->proto, numeric);
+-	}
+-	printf(" ");
+-}
+-
+ static void
+ print_v1(const struct ipt_ip *ip,
+ 	 const struct ipt_entry_match *match,
+@@ -369,34 +242,6 @@
+ 	printf(" ");
+ }
+ 
+-/* Saves the union ipt_matchinfo in parsable form to stdout. */
+-static void save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
+-{
+-	const struct ipt_multiport *multiinfo
+-		= (const struct ipt_multiport *)match->data;
+-	unsigned int i;
+-
+-	switch (multiinfo->flags) {
+-	case IPT_MULTIPORT_SOURCE:
+-		printf("--sports ");
+-		break;
+-
+-	case IPT_MULTIPORT_DESTINATION:
+-		printf("--dports ");
+-		break;
+-
+-	case IPT_MULTIPORT_EITHER:
+-		printf("--ports ");
+-		break;
+-	}
+-
+-	for (i=0; i < multiinfo->count; i++) {
+-		printf("%s", i ? "," : "");
+-		print_port(multiinfo->ports[i], ip->proto, 1);
+-	}
+-	printf(" ");
+-}
+-
+ static void save_v1(const struct ipt_ip *ip, 
+ 		    const struct ipt_entry_match *match)
+ {
+@@ -432,19 +277,20 @@
+ 	printf(" ");
+ }
+ 
++
+ static struct iptables_match multiport = { 
+ 	.next		= NULL,
+ 	.name		= "multiport",
+-	.revision	= 0,
+ 	.version	= IPTABLES_VERSION,
+-	.size		= IPT_ALIGN(sizeof(struct ipt_multiport)),
+-	.userspacesize	= IPT_ALIGN(sizeof(struct ipt_multiport)),
+-	.help		= &help,
++	.revision	= 0,
++	.size		= IPT_ALIGN(sizeof(struct ipt_multiport_v1)),
++	.userspacesize	= IPT_ALIGN(sizeof(struct ipt_multiport_v1)),
++	.help		= &help_v1,
+ 	.init		= &init,
+-	.parse		= &parse,
++	.parse		= &parse_v1,
+ 	.final_check	= &final_check,
+-	.print		= &print,
+-	.save		= &save,
++	.print		= &print_v1,
++	.save		= &save_v1,
+ 	.extra_opts	= opts
+ };
+ 
diff --git a/target/linux/generic-2.4/patches/619-nefilter_multiport_backport.patch b/target/linux/generic-2.4/patches/619-nefilter_multiport_backport.patch
new file mode 100644
index 000000000..de6ca1c7c
--- /dev/null
+++ b/target/linux/generic-2.4/patches/619-nefilter_multiport_backport.patch
@@ -0,0 +1,242 @@
+diff -urN linux.old/include/linux/netfilter_ipv4/ipt_multiport.h linux.dev/include/linux/netfilter_ipv4/ipt_multiport.h
+--- linux.old/include/linux/netfilter_ipv4/ipt_multiport.h	2000-12-11 22:31:30.000000000 +0100
++++ linux.dev/include/linux/netfilter_ipv4/ipt_multiport.h	2006-02-04 05:05:51.928476750 +0100
+@@ -18,4 +18,13 @@
+ 	u_int8_t count;				/* Number of ports */
+ 	u_int16_t ports[IPT_MULTI_PORTS];	/* Ports */
+ };
++
++struct ipt_multiport_v1
++{
++	u_int8_t flags;				/* Type of comparison */
++	u_int8_t count;				/* Number of ports */
++	u_int16_t ports[IPT_MULTI_PORTS];	/* Ports */
++	u_int8_t pflags[IPT_MULTI_PORTS];	/* Port flags */
++	u_int8_t invert;			/* Invert flag */
++};
+ #endif /*_IPT_MULTIPORT_H*/
+diff -urN linux.old/net/ipv4/netfilter/ipt_multiport.c linux.dev/net/ipv4/netfilter/ipt_multiport.c
+--- linux.old/net/ipv4/netfilter/ipt_multiport.c	2003-06-13 16:51:39.000000000 +0200
++++ linux.dev/net/ipv4/netfilter/ipt_multiport.c	2006-02-04 05:05:03.701462750 +0100
+@@ -1,5 +1,14 @@
+ /* Kernel module to match one of a list of TCP/UDP ports: ports are in
+    the same place so we can treat them as equal. */
++
++/* (C) 1999-2001 Paul `Rusty' Russell
++ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 as
++ * published by the Free Software Foundation.
++ */
++
+ #include <linux/module.h>
+ #include <linux/types.h>
+ #include <linux/udp.h>
+@@ -8,6 +17,10 @@
+ #include <linux/netfilter_ipv4/ipt_multiport.h>
+ #include <linux/netfilter_ipv4/ip_tables.h>
+ 
++MODULE_LICENSE("GPL");
++MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
++MODULE_DESCRIPTION("iptables multiple port match module");
++
+ #if 0
+ #define duprintf(format, args...) printk(format , ## args)
+ #else
+@@ -33,34 +46,109 @@
+ 	return 0;
+ }
+ 
++/* Returns 1 if the port is matched by the test, 0 otherwise. */
++static inline int
++ports_match_v1(const struct ipt_multiport_v1 *minfo,
++	       u_int16_t src, u_int16_t dst)
++{
++	unsigned int i;
++	u_int16_t s, e;
++
++	for (i=0; i < minfo->count; i++) {
++		s = minfo->ports[i];
++
++		if (minfo->pflags[i]) {
++			/* range port matching */
++			e = minfo->ports[++i];
++			duprintf("src or dst matches with %d-%d?\n", s, e);
++
++			if (minfo->flags == IPT_MULTIPORT_SOURCE
++			    && src >= s && src <= e)
++				return 1 ^ minfo->invert;
++			if (minfo->flags == IPT_MULTIPORT_DESTINATION
++			    && dst >= s && dst <= e)
++				return 1 ^ minfo->invert;
++			if (minfo->flags == IPT_MULTIPORT_EITHER
++			    && ((dst >= s && dst <= e)
++				|| (src >= s && src <= e)))
++				return 1 ^ minfo->invert;
++		} else {
++			/* exact port matching */
++			duprintf("src or dst matches with %d?\n", s);
++
++			if (minfo->flags == IPT_MULTIPORT_SOURCE
++			    && src == s)
++				return 1 ^ minfo->invert;
++			if (minfo->flags == IPT_MULTIPORT_DESTINATION
++			    && dst == s)
++				return 1 ^ minfo->invert;
++			if (minfo->flags == IPT_MULTIPORT_EITHER
++			    && (src == s || dst == s))
++				return 1 ^ minfo->invert;
++		}
++	}
++ 
++ 	return minfo->invert;
++}
++
+ static int
+ match(const struct sk_buff *skb,
+       const struct net_device *in,
+       const struct net_device *out,
+       const void *matchinfo,
+       int offset,
+-      const void *hdr,
+-      u_int16_t datalen,
+       int *hotdrop)
+ {
+-	const struct udphdr *udp = hdr;
++	u16 _ports[2], *pptr;
+ 	const struct ipt_multiport *multiinfo = matchinfo;
+ 
+-	/* Must be big enough to read ports. */
+-	if (offset == 0 && datalen < sizeof(struct udphdr)) {
++	if (offset)
++		return 0;
++
++	pptr = skb_header_pointer(skb, skb->nh.iph->ihl * 4,
++				  sizeof(_ports), _ports);
++	if (pptr == NULL) {
+ 		/* We've been asked to examine this packet, and we
+-		   can't.  Hence, no choice but to drop. */
+-			duprintf("ipt_multiport:"
+-				 " Dropping evil offset=0 tinygram.\n");
+-			*hotdrop = 1;
+-			return 0;
++		 * can't.  Hence, no choice but to drop.
++		 */
++		duprintf("ipt_multiport:"
++			 " Dropping evil offset=0 tinygram.\n");
++		*hotdrop = 1;
++		return 0;
+ 	}
+ 
+-	/* Must not be a fragment. */
+-	return !offset
+-		&& ports_match(multiinfo->ports,
+-			       multiinfo->flags, multiinfo->count,
+-			       ntohs(udp->source), ntohs(udp->dest));
++	return ports_match(multiinfo->ports,
++			   multiinfo->flags, multiinfo->count,
++			   ntohs(pptr[0]), ntohs(pptr[1]));
++}
++
++static int
++match_v1(const struct sk_buff *skb,
++	 const struct net_device *in,
++	 const struct net_device *out,
++	 const void *matchinfo,
++	 int offset,
++	 int *hotdrop)
++{
++	u16 _ports[2], *pptr;
++	const struct ipt_multiport_v1 *multiinfo = matchinfo;
++
++	if (offset)
++		return 0;
++
++	pptr = skb_header_pointer(skb, skb->nh.iph->ihl * 4,
++				  sizeof(_ports), _ports);
++	if (pptr == NULL) {
++		/* We've been asked to examine this packet, and we
++		 * can't.  Hence, no choice but to drop.
++		 */
++		duprintf("ipt_multiport:"
++			 " Dropping evil offset=0 tinygram.\n");
++		*hotdrop = 1;
++		return 0;
++	}
++
++	return ports_match_v1(multiinfo, ntohs(pptr[0]), ntohs(pptr[1]));
+ }
+ 
+ /* Called when user tries to insert an entry of this type. */
+@@ -71,34 +159,54 @@
+ 	   unsigned int matchsize,
+ 	   unsigned int hook_mask)
+ {
+-	const struct ipt_multiport *multiinfo = matchinfo;
+-
+-	if (matchsize != IPT_ALIGN(sizeof(struct ipt_multiport)))
+-		return 0;
++	return (matchsize == IPT_ALIGN(sizeof(struct ipt_multiport)));
++}
+ 
+-	/* Must specify proto == TCP/UDP, no unknown flags or bad count */
+-	return (ip->proto == IPPROTO_TCP || ip->proto == IPPROTO_UDP)
+-		&& !(ip->invflags & IPT_INV_PROTO)
+-		&& matchsize == IPT_ALIGN(sizeof(struct ipt_multiport))
+-		&& (multiinfo->flags == IPT_MULTIPORT_SOURCE
+-		    || multiinfo->flags == IPT_MULTIPORT_DESTINATION
+-		    || multiinfo->flags == IPT_MULTIPORT_EITHER)
+-		&& multiinfo->count <= IPT_MULTI_PORTS;
++static int
++checkentry_v1(const char *tablename,
++	      const struct ipt_ip *ip,
++	      void *matchinfo,
++	      unsigned int matchsize,
++	      unsigned int hook_mask)
++{
++	return (matchsize == IPT_ALIGN(sizeof(struct ipt_multiport_v1)));
+ }
+ 
+-static struct ipt_match multiport_match
+-= { { NULL, NULL }, "multiport", &match, &checkentry, NULL, THIS_MODULE };
++static struct ipt_match multiport_match = {
++	.name		= "multiport",
++	.revision	= 0,
++	.match		= &match,
++	.checkentry	= &checkentry,
++	.me		= THIS_MODULE,
++};
++
++static struct ipt_match multiport_match_v1 = {
++	.name		= "multiport",
++	.revision	= 1,
++	.match		= &match_v1,
++	.checkentry	= &checkentry_v1,
++	.me		= THIS_MODULE,
++};
+ 
+ static int __init init(void)
+ {
+-	return ipt_register_match(&multiport_match);
++	int err;
++
++	err = ipt_register_match(&multiport_match);
++	if (!err) {
++		err = ipt_register_match(&multiport_match_v1);
++		if (err)
++			ipt_unregister_match(&multiport_match);
++	}
++
++	return err;
+ }
+ 
+ static void __exit fini(void)
+ {
+ 	ipt_unregister_match(&multiport_match);
++	ipt_unregister_match(&multiport_match_v1);
+ }
+ 
+ module_init(init);
+ module_exit(fini);
+-MODULE_LICENSE("GPL");