diff options
| -rw-r--r-- | include/linux/netfilter/xt_connmark.h | 5 | ||||
| -rw-r--r-- | net/netfilter/xt_connmark.c | 88 |
2 files changed, 76 insertions, 17 deletions
diff --git a/include/linux/netfilter/xt_connmark.h b/include/linux/netfilter/xt_connmark.h index c592f6ae088..359ef86918d 100644 --- a/include/linux/netfilter/xt_connmark.h +++ b/include/linux/netfilter/xt_connmark.h @@ -15,4 +15,9 @@ struct xt_connmark_info { u_int8_t invert; }; +struct xt_connmark_mtinfo1 { + u_int32_t mark, mask; + u_int8_t invert; +}; + #endif /*_XT_CONNMARK_H*/ diff --git a/net/netfilter/xt_connmark.c b/net/netfilter/xt_connmark.c index 8ad875bc158..55c62350b1f 100644 --- a/net/netfilter/xt_connmark.c +++ b/net/netfilter/xt_connmark.c @@ -1,8 +1,10 @@ -/* This kernel module matches connection mark values set by the - * CONNMARK target +/* + * xt_connmark - Netfilter module to match connection mark values * - * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com> - * by Henrik Nordstrom <hno@marasystems.com> + * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com> + * by Henrik Nordstrom <hno@marasystems.com> + * Copyright © CC Computer Consultants GmbH, 2007 - 2008 + * Jan Engelhardt <jengelh@computergmbh.de> * * 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 @@ -37,6 +39,23 @@ connmark_mt(const struct sk_buff *skb, const struct net_device *in, const void *matchinfo, int offset, unsigned int protoff, bool *hotdrop) { + const struct xt_connmark_mtinfo1 *info = matchinfo; + enum ip_conntrack_info ctinfo; + const struct nf_conn *ct; + + ct = nf_ct_get(skb, &ctinfo); + if (ct == NULL) + return false; + + return ((ct->mark & info->mask) == info->mark) ^ info->invert; +} + +static bool +connmark_mt_v0(const struct sk_buff *skb, 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) +{ const struct xt_connmark_info *info = matchinfo; const struct nf_conn *ct; enum ip_conntrack_info ctinfo; @@ -49,9 +68,9 @@ connmark_mt(const struct sk_buff *skb, const struct net_device *in, } static bool -connmark_mt_check(const char *tablename, const void *ip, - const struct xt_match *match, void *matchinfo, - unsigned int hook_mask) +connmark_mt_check_v0(const char *tablename, const void *ip, + const struct xt_match *match, void *matchinfo, + unsigned int hook_mask) { const struct xt_connmark_info *cm = matchinfo; @@ -67,6 +86,19 @@ connmark_mt_check(const char *tablename, const void *ip, return true; } +static bool +connmark_mt_check(const char *tablename, const void *ip, + const struct xt_match *match, void *matchinfo, + unsigned int hook_mask) +{ + if (nf_ct_l3proto_try_module_get(match->family) < 0) { + printk(KERN_WARNING "cannot load conntrack support for " + "proto=%u\n", match->family); + return false; + } + return true; +} + static void connmark_mt_destroy(const struct xt_match *match, void *matchinfo) { @@ -81,7 +113,7 @@ struct compat_xt_connmark_info { u_int16_t __pad2; }; -static void connmark_mt_compat_from_user(void *dst, void *src) +static void connmark_mt_compat_from_user_v0(void *dst, void *src) { const struct compat_xt_connmark_info *cm = src; struct xt_connmark_info m = { @@ -92,7 +124,7 @@ static void connmark_mt_compat_from_user(void *dst, void *src) memcpy(dst, &m, sizeof(m)); } -static int connmark_mt_compat_to_user(void __user *dst, void *src) +static int connmark_mt_compat_to_user_v0(void __user *dst, void *src) { const struct xt_connmark_info *m = src; struct compat_xt_connmark_info cm = { @@ -107,32 +139,54 @@ static int connmark_mt_compat_to_user(void __user *dst, void *src) static struct xt_match connmark_mt_reg[] __read_mostly = { { .name = "connmark", + .revision = 0, .family = AF_INET, - .checkentry = connmark_mt_check, - .match = connmark_mt, + .checkentry = connmark_mt_check_v0, + .match = connmark_mt_v0, .destroy = connmark_mt_destroy, .matchsize = sizeof(struct xt_connmark_info), #ifdef CONFIG_COMPAT .compatsize = sizeof(struct compat_xt_connmark_info), - .compat_from_user = connmark_mt_compat_from_user, - .compat_to_user = connmark_mt_compat_to_user, + .compat_from_user = connmark_mt_compat_from_user_v0, + .compat_to_user = connmark_mt_compat_to_user_v0, #endif .me = THIS_MODULE }, { .name = "connmark", + .revision = 0, .family = AF_INET6, - .checkentry = connmark_mt_check, - .match = connmark_mt, + .checkentry = connmark_mt_check_v0, + .match = connmark_mt_v0, .destroy = connmark_mt_destroy, .matchsize = sizeof(struct xt_connmark_info), #ifdef CONFIG_COMPAT .compatsize = sizeof(struct compat_xt_connmark_info), - .compat_from_user = connmark_mt_compat_from_user, - .compat_to_user = connmark_mt_compat_to_user, + .compat_from_user = connmark_mt_compat_from_user_v0, + .compat_to_user = connmark_mt_compat_to_user_v0, #endif .me = THIS_MODULE }, + { + .name = "connmark", + .revision = 1, + .family = AF_INET, + .checkentry = connmark_mt_check, + .match = connmark_mt, + .matchsize = sizeof(struct xt_connmark_mtinfo1), + .destroy = connmark_mt_destroy, + .me = THIS_MODULE, + }, + { + .name = "connmark", + .revision = 1, + .family = AF_INET6, + .checkentry = connmark_mt_check, + .match = connmark_mt, + .matchsize = sizeof(struct xt_connmark_mtinfo1), + .destroy = connmark_mt_destroy, + .me = THIS_MODULE, + }, }; static int __init connmark_mt_init(void) |