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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, write to the Free Software
 21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 22  */
 23 
 24 #include <linux/module.h>
 25 #include <linux/skbuff.h>
 26 #include <net/netfilter/nf_conntrack.h>
 27 #include <net/netfilter/nf_conntrack_ecache.h>
 28 #include <linux/netfilter/x_tables.h>
 29 #include <linux/netfilter/xt_connmark.h>
 30 
 31 MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>");
 32 MODULE_DESCRIPTION("Xtables: connection mark operations");
 33 MODULE_LICENSE("GPL");
 34 MODULE_ALIAS("ipt_CONNMARK");
 35 MODULE_ALIAS("ip6t_CONNMARK");
 36 MODULE_ALIAS("ipt_connmark");
 37 MODULE_ALIAS("ip6t_connmark");
 38 
 39 static unsigned int
 40 connmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
 41 {
 42         const struct xt_connmark_tginfo1 *info = par->targinfo;
 43         enum ip_conntrack_info ctinfo;
 44         struct nf_conn *ct;
 45         u_int32_t newmark;
 46 
 47         ct = nf_ct_get(skb, &ctinfo);
 48         if (ct == NULL)
 49                 return XT_CONTINUE;
 50 
 51         switch (info->mode) {
 52         case XT_CONNMARK_SET:
 53                 newmark = (ct->mark & ~info->ctmask) ^ info->ctmark;
 54                 if (ct->mark != newmark) {
 55                         ct->mark = newmark;
 56                         nf_conntrack_event_cache(IPCT_MARK, ct);
 57                 }
 58                 break;
 59         case XT_CONNMARK_SAVE:
 60                 newmark = (ct->mark & ~info->ctmask) ^
 61                           (skb->mark & info->nfmask);
 62                 if (ct->mark != newmark) {
 63                         ct->mark = newmark;
 64                         nf_conntrack_event_cache(IPCT_MARK, ct);
 65                 }
 66                 break;
 67         case XT_CONNMARK_RESTORE:
 68                 newmark = (skb->mark & ~info->nfmask) ^
 69                           (ct->mark & info->ctmask);
 70                 skb->mark = newmark;
 71                 break;
 72         }
 73 
 74         return XT_CONTINUE;
 75 }
 76 
 77 static int connmark_tg_check(const struct xt_tgchk_param *par)
 78 {
 79         int ret;
 80 
 81         ret = nf_ct_l3proto_try_module_get(par->family);
 82         if (ret < 0)
 83                 pr_info("cannot load conntrack support for proto=%u\n",
 84                         par->family);
 85         return ret;
 86 }
 87 
 88 static void connmark_tg_destroy(const struct xt_tgdtor_param *par)
 89 {
 90         nf_ct_l3proto_module_put(par->family);
 91 }
 92 
 93 static bool
 94 connmark_mt(const struct sk_buff *skb, struct xt_action_param *par)
 95 {
 96         const struct xt_connmark_mtinfo1 *info = par->matchinfo;
 97         enum ip_conntrack_info ctinfo;
 98         const struct nf_conn *ct;
 99 
100         ct = nf_ct_get(skb, &ctinfo);
101         if (ct == NULL)
102                 return false;
103 
104         return ((ct->mark & info->mask) == info->mark) ^ info->invert;
105 }
106 
107 static int connmark_mt_check(const struct xt_mtchk_param *par)
108 {
109         int ret;
110 
111         ret = nf_ct_l3proto_try_module_get(par->family);
112         if (ret < 0)
113                 pr_info("cannot load conntrack support for proto=%u\n",
114                         par->family);
115         return ret;
116 }
117 
118 static void connmark_mt_destroy(const struct xt_mtdtor_param *par)
119 {
120         nf_ct_l3proto_module_put(par->family);
121 }
122 
123 static struct xt_target connmark_tg_reg __read_mostly = {
124         .name           = "CONNMARK",
125         .revision       = 1,
126         .family         = NFPROTO_UNSPEC,
127         .checkentry     = connmark_tg_check,
128         .target         = connmark_tg,
129         .targetsize     = sizeof(struct xt_connmark_tginfo1),
130         .destroy        = connmark_tg_destroy,
131         .me             = THIS_MODULE,
132 };
133 
134 static struct xt_match connmark_mt_reg __read_mostly = {
135         .name           = "connmark",
136         .revision       = 1,
137         .family         = NFPROTO_UNSPEC,
138         .checkentry     = connmark_mt_check,
139         .match          = connmark_mt,
140         .matchsize      = sizeof(struct xt_connmark_mtinfo1),
141         .destroy        = connmark_mt_destroy,
142         .me             = THIS_MODULE,
143 };
144 
145 static int __init connmark_mt_init(void)
146 {
147         int ret;
148 
149         ret = xt_register_target(&connmark_tg_reg);
150         if (ret < 0)
151                 return ret;
152         ret = xt_register_match(&connmark_mt_reg);
153         if (ret < 0) {
154                 xt_unregister_target(&connmark_tg_reg);
155                 return ret;
156         }
157         return 0;
158 }
159 
160 static void __exit connmark_mt_exit(void)
161 {
162         xt_unregister_match(&connmark_mt_reg);
163         xt_unregister_target(&connmark_tg_reg);
164 }
165 
166 module_init(connmark_mt_init);
167 module_exit(connmark_mt_exit);
168 

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