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Linux/net/netfilter/xt_connmark.c

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  1 /*
  2  *      xt_connmark - Netfilter module to operate on connection marks
  3  *
  4  *      Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
  5  *      by Henrik Nordstrom <hno@marasystems.com>
  6  *      Copyright © CC Computer Consultants GmbH, 2007 - 2008
  7  *      Jan Engelhardt <jengelh@medozas.de>
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License as published by
 11  * the Free Software Foundation; either version 2 of the License, or
 12  * (at your option) any later version.
 13  *
 14  * This program is distributed in the hope that it will be useful,
 15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 17  * GNU General Public License for more details.
 18  *
 19  * You should have received a copy of the GNU General Public License
 20  * along with this program; if not, see <http://www.gnu.org/licenses/>.
 21  */
 22 
 23 #include <linux/module.h>
 24 #include <linux/skbuff.h>
 25 #include <net/netfilter/nf_conntrack.h>
 26 #include <net/netfilter/nf_conntrack_ecache.h>
 27 #include <linux/netfilter/x_tables.h>
 28 #include <linux/netfilter/xt_connmark.h>
 29 
 30 MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>");
 31 MODULE_DESCRIPTION("Xtables: connection mark operations");
 32 MODULE_LICENSE("GPL");
 33 MODULE_ALIAS("ipt_CONNMARK");
 34 MODULE_ALIAS("ip6t_CONNMARK");
 35 MODULE_ALIAS("ipt_connmark");
 36 MODULE_ALIAS("ip6t_connmark");
 37 
 38 static unsigned int
 39 connmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
 40 {
 41         const struct xt_connmark_tginfo1 *info = par->targinfo;
 42         enum ip_conntrack_info ctinfo;
 43         struct nf_conn *ct;
 44         u_int32_t newmark;
 45 
 46         ct = nf_ct_get(skb, &ctinfo);
 47         if (ct == NULL)
 48                 return XT_CONTINUE;
 49 
 50         switch (info->mode) {
 51         case XT_CONNMARK_SET:
 52                 newmark = (ct->mark & ~info->ctmask) ^ info->ctmark;
 53                 if (ct->mark != newmark) {
 54                         ct->mark = newmark;
 55                         nf_conntrack_event_cache(IPCT_MARK, ct);
 56                 }
 57                 break;
 58         case XT_CONNMARK_SAVE:
 59                 newmark = (ct->mark & ~info->ctmask) ^
 60                           (skb->mark & info->nfmask);
 61                 if (ct->mark != newmark) {
 62                         ct->mark = newmark;
 63                         nf_conntrack_event_cache(IPCT_MARK, ct);
 64                 }
 65                 break;
 66         case XT_CONNMARK_RESTORE:
 67                 newmark = (skb->mark & ~info->nfmask) ^
 68                           (ct->mark & info->ctmask);
 69                 skb->mark = newmark;
 70                 break;
 71         }
 72 
 73         return XT_CONTINUE;
 74 }
 75 
 76 static int connmark_tg_check(const struct xt_tgchk_param *par)
 77 {
 78         int ret;
 79 
 80         ret = nf_ct_l3proto_try_module_get(par->family);
 81         if (ret < 0)
 82                 pr_info("cannot load conntrack support for proto=%u\n",
 83                         par->family);
 84         return ret;
 85 }
 86 
 87 static void connmark_tg_destroy(const struct xt_tgdtor_param *par)
 88 {
 89         nf_ct_l3proto_module_put(par->family);
 90 }
 91 
 92 static bool
 93 connmark_mt(const struct sk_buff *skb, struct xt_action_param *par)
 94 {
 95         const struct xt_connmark_mtinfo1 *info = par->matchinfo;
 96         enum ip_conntrack_info ctinfo;
 97         const struct nf_conn *ct;
 98 
 99         ct = nf_ct_get(skb, &ctinfo);
100         if (ct == NULL)
101                 return false;
102 
103         return ((ct->mark & info->mask) == info->mark) ^ info->invert;
104 }
105 
106 static int connmark_mt_check(const struct xt_mtchk_param *par)
107 {
108         int ret;
109 
110         ret = nf_ct_l3proto_try_module_get(par->family);
111         if (ret < 0)
112                 pr_info("cannot load conntrack support for proto=%u\n",
113                         par->family);
114         return ret;
115 }
116 
117 static void connmark_mt_destroy(const struct xt_mtdtor_param *par)
118 {
119         nf_ct_l3proto_module_put(par->family);
120 }
121 
122 static struct xt_target connmark_tg_reg __read_mostly = {
123         .name           = "CONNMARK",
124         .revision       = 1,
125         .family         = NFPROTO_UNSPEC,
126         .checkentry     = connmark_tg_check,
127         .target         = connmark_tg,
128         .targetsize     = sizeof(struct xt_connmark_tginfo1),
129         .destroy        = connmark_tg_destroy,
130         .me             = THIS_MODULE,
131 };
132 
133 static struct xt_match connmark_mt_reg __read_mostly = {
134         .name           = "connmark",
135         .revision       = 1,
136         .family         = NFPROTO_UNSPEC,
137         .checkentry     = connmark_mt_check,
138         .match          = connmark_mt,
139         .matchsize      = sizeof(struct xt_connmark_mtinfo1),
140         .destroy        = connmark_mt_destroy,
141         .me             = THIS_MODULE,
142 };
143 
144 static int __init connmark_mt_init(void)
145 {
146         int ret;
147 
148         ret = xt_register_target(&connmark_tg_reg);
149         if (ret < 0)
150                 return ret;
151         ret = xt_register_match(&connmark_mt_reg);
152         if (ret < 0) {
153                 xt_unregister_target(&connmark_tg_reg);
154                 return ret;
155         }
156         return 0;
157 }
158 
159 static void __exit connmark_mt_exit(void)
160 {
161         xt_unregister_match(&connmark_mt_reg);
162         xt_unregister_target(&connmark_tg_reg);
163 }
164 
165 module_init(connmark_mt_init);
166 module_exit(connmark_mt_exit);
167 

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