![Jan Engelhardt](/assets/img/avatar_default.png)
Give all Netfilter modules consistent and unique symbol names. Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
146 lines
4 KiB
C
146 lines
4 KiB
C
/* This kernel module matches connection mark values set by the
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* CONNMARK target
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*
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* Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
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* by Henrik Nordstrom <hno@marasystems.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter/xt_connmark.h>
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MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>");
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MODULE_DESCRIPTION("IP tables connmark match module");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("ipt_connmark");
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MODULE_ALIAS("ip6t_connmark");
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static bool
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connmark_mt(const struct sk_buff *skb, const struct net_device *in,
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const struct net_device *out, const struct xt_match *match,
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const void *matchinfo, int offset, unsigned int protoff,
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bool *hotdrop)
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{
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const struct xt_connmark_info *info = matchinfo;
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const struct nf_conn *ct;
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enum ip_conntrack_info ctinfo;
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ct = nf_ct_get(skb, &ctinfo);
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if (!ct)
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return false;
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return ((ct->mark & info->mask) == info->mark) ^ info->invert;
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}
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static bool
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connmark_mt_check(const char *tablename, const void *ip,
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const struct xt_match *match, void *matchinfo,
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unsigned int hook_mask)
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{
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const struct xt_connmark_info *cm = matchinfo;
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if (cm->mark > 0xffffffff || cm->mask > 0xffffffff) {
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printk(KERN_WARNING "connmark: only support 32bit mark\n");
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return false;
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}
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if (nf_ct_l3proto_try_module_get(match->family) < 0) {
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printk(KERN_WARNING "can't load conntrack support for "
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"proto=%d\n", match->family);
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return false;
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}
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return true;
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}
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static void
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connmark_mt_destroy(const struct xt_match *match, void *matchinfo)
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{
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nf_ct_l3proto_module_put(match->family);
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}
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#ifdef CONFIG_COMPAT
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struct compat_xt_connmark_info {
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compat_ulong_t mark, mask;
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u_int8_t invert;
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u_int8_t __pad1;
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u_int16_t __pad2;
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};
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static void connmark_mt_compat_from_user(void *dst, void *src)
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{
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const struct compat_xt_connmark_info *cm = src;
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struct xt_connmark_info m = {
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.mark = cm->mark,
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.mask = cm->mask,
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.invert = cm->invert,
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};
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memcpy(dst, &m, sizeof(m));
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}
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static int connmark_mt_compat_to_user(void __user *dst, void *src)
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{
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const struct xt_connmark_info *m = src;
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struct compat_xt_connmark_info cm = {
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.mark = m->mark,
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.mask = m->mask,
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.invert = m->invert,
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};
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return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0;
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}
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#endif /* CONFIG_COMPAT */
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static struct xt_match connmark_mt_reg[] __read_mostly = {
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{
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.name = "connmark",
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.family = AF_INET,
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.checkentry = connmark_mt_check,
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.match = connmark_mt,
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.destroy = connmark_mt_destroy,
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.matchsize = sizeof(struct xt_connmark_info),
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#ifdef CONFIG_COMPAT
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.compatsize = sizeof(struct compat_xt_connmark_info),
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.compat_from_user = connmark_mt_compat_from_user,
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.compat_to_user = connmark_mt_compat_to_user,
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#endif
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.me = THIS_MODULE
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},
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{
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.name = "connmark",
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.family = AF_INET6,
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.checkentry = connmark_mt_check,
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.match = connmark_mt,
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.destroy = connmark_mt_destroy,
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.matchsize = sizeof(struct xt_connmark_info),
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.me = THIS_MODULE
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},
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};
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static int __init connmark_mt_init(void)
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{
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return xt_register_matches(connmark_mt_reg,
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ARRAY_SIZE(connmark_mt_reg));
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}
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static void __exit connmark_mt_exit(void)
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{
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xt_unregister_matches(connmark_mt_reg, ARRAY_SIZE(connmark_mt_reg));
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}
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module_init(connmark_mt_init);
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module_exit(connmark_mt_exit);
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