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Linux/net/netfilter/xt_CONNSECMARK.c

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  1 /*
  2  * This module is used to copy security markings from packets
  3  * to connections, and restore security markings from connections
  4  * back to packets.  This would normally be performed in conjunction
  5  * with the SECMARK target and state match.
  6  *
  7  * Based somewhat on CONNMARK:
  8  *   Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
  9  *    by Henrik Nordstrom <hno@marasystems.com>
 10  *
 11  * (C) 2006,2008 Red Hat, Inc., James Morris <jmorris@redhat.com>
 12  *
 13  * This program is free software; you can redistribute it and/or modify
 14  * it under the terms of the GNU General Public License version 2 as
 15  * published by the Free Software Foundation.
 16  *
 17  */
 18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 19 #include <linux/module.h>
 20 #include <linux/skbuff.h>
 21 #include <linux/netfilter/x_tables.h>
 22 #include <linux/netfilter/xt_CONNSECMARK.h>
 23 #include <net/netfilter/nf_conntrack.h>
 24 #include <net/netfilter/nf_conntrack_ecache.h>
 25 
 26 MODULE_LICENSE("GPL");
 27 MODULE_AUTHOR("James Morris <jmorris@redhat.com>");
 28 MODULE_DESCRIPTION("Xtables: target for copying between connection and security mark");
 29 MODULE_ALIAS("ipt_CONNSECMARK");
 30 MODULE_ALIAS("ip6t_CONNSECMARK");
 31 
 32 /*
 33  * If the packet has a security mark and the connection does not, copy
 34  * the security mark from the packet to the connection.
 35  */
 36 static void secmark_save(const struct sk_buff *skb)
 37 {
 38         if (skb->secmark) {
 39                 struct nf_conn *ct;
 40                 enum ip_conntrack_info ctinfo;
 41 
 42                 ct = nf_ct_get(skb, &ctinfo);
 43                 if (ct && !ct->secmark) {
 44                         ct->secmark = skb->secmark;
 45                         nf_conntrack_event_cache(IPCT_SECMARK, ct);
 46                 }
 47         }
 48 }
 49 
 50 /*
 51  * If packet has no security mark, and the connection does, restore the
 52  * security mark from the connection to the packet.
 53  */
 54 static void secmark_restore(struct sk_buff *skb)
 55 {
 56         if (!skb->secmark) {
 57                 const struct nf_conn *ct;
 58                 enum ip_conntrack_info ctinfo;
 59 
 60                 ct = nf_ct_get(skb, &ctinfo);
 61                 if (ct && ct->secmark)
 62                         skb->secmark = ct->secmark;
 63         }
 64 }
 65 
 66 static unsigned int
 67 connsecmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
 68 {
 69         const struct xt_connsecmark_target_info *info = par->targinfo;
 70 
 71         switch (info->mode) {
 72         case CONNSECMARK_SAVE:
 73                 secmark_save(skb);
 74                 break;
 75 
 76         case CONNSECMARK_RESTORE:
 77                 secmark_restore(skb);
 78                 break;
 79 
 80         default:
 81                 BUG();
 82         }
 83 
 84         return XT_CONTINUE;
 85 }
 86 
 87 static int connsecmark_tg_check(const struct xt_tgchk_param *par)
 88 {
 89         const struct xt_connsecmark_target_info *info = par->targinfo;
 90         int ret;
 91 
 92         if (strcmp(par->table, "mangle") != 0 &&
 93             strcmp(par->table, "security") != 0) {
 94                 pr_info("target only valid in the \'mangle\' "
 95                         "or \'security\' tables, not \'%s\'.\n", par->table);
 96                 return -EINVAL;
 97         }
 98 
 99         switch (info->mode) {
100         case CONNSECMARK_SAVE:
101         case CONNSECMARK_RESTORE:
102                 break;
103 
104         default:
105                 pr_info("invalid mode: %hu\n", info->mode);
106                 return -EINVAL;
107         }
108 
109         ret = nf_ct_l3proto_try_module_get(par->family);
110         if (ret < 0)
111                 pr_info("cannot load conntrack support for proto=%u\n",
112                         par->family);
113         return ret;
114 }
115 
116 static void connsecmark_tg_destroy(const struct xt_tgdtor_param *par)
117 {
118         nf_ct_l3proto_module_put(par->family);
119 }
120 
121 static struct xt_target connsecmark_tg_reg __read_mostly = {
122         .name       = "CONNSECMARK",
123         .revision   = 0,
124         .family     = NFPROTO_UNSPEC,
125         .checkentry = connsecmark_tg_check,
126         .destroy    = connsecmark_tg_destroy,
127         .target     = connsecmark_tg,
128         .targetsize = sizeof(struct xt_connsecmark_target_info),
129         .me         = THIS_MODULE,
130 };
131 
132 static int __init connsecmark_tg_init(void)
133 {
134         return xt_register_target(&connsecmark_tg_reg);
135 }
136 
137 static void __exit connsecmark_tg_exit(void)
138 {
139         xt_unregister_target(&connsecmark_tg_reg);
140 }
141 
142 module_init(connsecmark_tg_init);
143 module_exit(connsecmark_tg_exit);
144 

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