diff options
Diffstat (limited to 'net/netfilter/xt_connmark.c')
| -rw-r--r-- | net/netfilter/xt_connmark.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/net/netfilter/xt_connmark.c b/net/netfilter/xt_connmark.c new file mode 100644 index 0000000..86cacab --- /dev/null +++ b/net/netfilter/xt_connmark.c @@ -0,0 +1,166 @@ +/* + * 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 © 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 + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/module.h> +#include <linux/skbuff.h> +#include <net/netfilter/nf_conntrack.h> +#include <linux/netfilter/x_tables.h> +#include <linux/netfilter/xt_connmark.h> + +MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>"); +MODULE_DESCRIPTION("Xtables: connection mark match"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("ipt_connmark"); +MODULE_ALIAS("ip6t_connmark"); + +static bool +connmark_mt(const struct sk_buff *skb, const struct xt_match_param *par) +{ + const struct xt_connmark_mtinfo1 *info = par->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 xt_match_param *par) +{ + const struct xt_connmark_info *info = par->matchinfo; + const struct nf_conn *ct; + enum ip_conntrack_info ctinfo; + + ct = nf_ct_get(skb, &ctinfo); + if (!ct) + return false; + + return ((ct->mark & info->mask) == info->mark) ^ info->invert; +} + +static bool connmark_mt_check_v0(const struct xt_mtchk_param *par) +{ + const struct xt_connmark_info *cm = par->matchinfo; + + if (cm->mark > 0xffffffff || cm->mask > 0xffffffff) { + printk(KERN_WARNING "connmark: only support 32bit mark\n"); + return false; + } + if (nf_ct_l3proto_try_module_get(par->family) < 0) { + printk(KERN_WARNING "can't load conntrack support for " + "proto=%u\n", par->family); + return false; + } + return true; +} + +static bool connmark_mt_check(const struct xt_mtchk_param *par) +{ + if (nf_ct_l3proto_try_module_get(par->family) < 0) { + printk(KERN_WARNING "cannot load conntrack support for " + "proto=%u\n", par->family); + return false; + } + return true; +} + +static void connmark_mt_destroy(const struct xt_mtdtor_param *par) +{ + nf_ct_l3proto_module_put(par->family); +} + +#ifdef CONFIG_COMPAT +struct compat_xt_connmark_info { + compat_ulong_t mark, mask; + u_int8_t invert; + u_int8_t __pad1; + u_int16_t __pad2; +}; + +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 = { + .mark = cm->mark, + .mask = cm->mask, + .invert = cm->invert, + }; + memcpy(dst, &m, sizeof(m)); +} + +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 = { + .mark = m->mark, + .mask = m->mask, + .invert = m->invert, + }; + return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0; +} +#endif /* CONFIG_COMPAT */ + +static struct xt_match connmark_mt_reg[] __read_mostly = { + { + .name = "connmark", + .revision = 0, + .family = NFPROTO_UNSPEC, + .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_v0, + .compat_to_user = connmark_mt_compat_to_user_v0, +#endif + .me = THIS_MODULE + }, + { + .name = "connmark", + .revision = 1, + .family = NFPROTO_UNSPEC, + .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) +{ + return xt_register_matches(connmark_mt_reg, + ARRAY_SIZE(connmark_mt_reg)); +} + +static void __exit connmark_mt_exit(void) +{ + xt_unregister_matches(connmark_mt_reg, ARRAY_SIZE(connmark_mt_reg)); +} + +module_init(connmark_mt_init); +module_exit(connmark_mt_exit); |
