From bc8804281c78378145e6e682e7d60c3e77737c8a Mon Sep 17 00:00:00 2001
From: nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Sat, 4 Feb 2006 04:57:08 +0000
Subject: 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@3125 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
.../patches/619-nefilter_multiport_backport.patch | 242 +++++++++++++++++++++
1 file changed, 242 insertions(+)
create mode 100644 openwrt/target/linux/generic-2.4/patches/619-nefilter_multiport_backport.patch
(limited to 'openwrt/target/linux')
diff --git a/openwrt/target/linux/generic-2.4/patches/619-nefilter_multiport_backport.patch b/openwrt/target/linux/generic-2.4/patches/619-nefilter_multiport_backport.patch
new file mode 100644
index 000000000..de6ca1c7c
--- /dev/null
+++ b/openwrt/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");
--
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