-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 05:23:54.318518250 +0100
-@@ -11,11 +11,12 @@
-
- #define IPT_MULTI_PORTS 15
-
--/* Must fit inside union ipt_matchinfo: 16 bytes */
--struct ipt_multiport
-+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 05:34:27.362081000 +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>
-@@ -8,97 +17,136 @@
- #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
- #define duprintf(format, args...)
- #endif
-
-+/* from linux 2.6 skbuff.h */
-+static inline void *skb_header_pointer(const struct sk_buff *skb, int offset,
-+ int len, void *buffer)
-+{
-+ int hlen = skb_headlen(skb);
-+
-+ if (hlen - offset >= len)
-+ return skb->data + offset;
-+
-+ if (skb_copy_bits(skb, offset, buffer, len) < 0)
-+ return NULL;
-+
-+ return buffer;
-+}
-+
-+
- /* Returns 1 if the port is matched by the test, 0 otherwise. */
- static inline int
--ports_match(const u_int16_t *portlist, enum ipt_multiport_flags flags,
-- u_int8_t count, u_int16_t src, u_int16_t dst)
-+ports_match_v1(const struct ipt_multiport_v1 *minfo,
-+ u_int16_t src, u_int16_t dst)
- {
- unsigned int i;
-- for (i=0; i<count; i++) {
-- if (flags != IPT_MULTIPORT_DESTINATION
-- && portlist[i] == src)
-- return 1;
--
-- if (flags != IPT_MULTIPORT_SOURCE
-- && portlist[i] == dst)
-- return 1;
-- }
-+ u_int16_t s, e;
-
-- return 0;
-+ 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)
-+match_v1(const struct sk_buff *skb,
-+ const struct net_device *in,
-+ const struct net_device *out,
-+ const void *matchinfo,
-+ int offset,
-+ int *hotdrop)
- {
-- const struct udphdr *udp = hdr;
-- const struct ipt_multiport *multiinfo = matchinfo;
-+ u16 _ports[2], *pptr;
-+ const struct ipt_multiport_v1 *multiinfo = matchinfo;
-+
-+ if (offset)
-+ return 0;
-
-- /* Must be big enough to read ports. */
-- if (offset == 0 && datalen < sizeof(struct udphdr)) {
-+ 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_v1(multiinfo, ntohs(pptr[0]), ntohs(pptr[1]));
- }
-
--/* Called when user tries to insert an entry of this type. */
- static int
--checkentry(const char *tablename,
-- const struct ipt_ip *ip,
-- void *matchinfo,
-- unsigned int matchsize,
-- unsigned int hook_mask)
-+checkentry_v1(const char *tablename,
-+ const struct ipt_ip *ip,
-+ void *matchinfo,
-+ unsigned int matchsize,
-+ unsigned int hook_mask)
- {
-- const struct ipt_multiport *multiinfo = matchinfo;
--
-- if (matchsize != IPT_ALIGN(sizeof(struct ipt_multiport)))
-- return 0;
--
-- /* 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;
-+ 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_v1 = {
-+ .name = "multiport",
-+ .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_v1);
-+
-+ 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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