2 * Module for modifying the secmark field of the skb, for use by
5 * Based on the nfmark match by:
6 * (C) 1999-2001 Marc Boucher <marc@mbsi.ca>
8 * (C) 2006,2008 Red Hat, Inc., James Morris <jmorris@redhat.com>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16 #include <linux/module.h>
17 #include <linux/skbuff.h>
18 #include <linux/selinux.h>
19 #include <linux/netfilter/x_tables.h>
20 #include <linux/netfilter/xt_SECMARK.h>
22 MODULE_LICENSE("GPL");
23 MODULE_AUTHOR("James Morris <jmorris@redhat.com>");
24 MODULE_DESCRIPTION("Xtables: packet security mark modification");
25 MODULE_ALIAS("ipt_SECMARK");
26 MODULE_ALIAS("ip6t_SECMARK");
28 #define PFX "SECMARK: "
33 secmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
36 const struct xt_secmark_target_info *info = par->targinfo;
38 BUG_ON(info->mode != mode);
41 case SECMARK_MODE_SEL:
42 secmark = info->u.sel.selsid;
49 skb->secmark = secmark;
53 static int checkentry_selinux(struct xt_secmark_target_info *info)
56 struct xt_secmark_target_selinux_info *sel = &info->u.sel;
58 sel->selctx[SECMARK_SELCTX_MAX - 1] = '\0';
60 err = selinux_string_to_sid(sel->selctx, &sel->selsid);
63 pr_info("invalid SELinux context \'%s\'\n",
69 pr_info("unable to map SELinux context \'%s\'\n", sel->selctx);
73 err = selinux_secmark_relabel_packet_permission(sel->selsid);
75 pr_info("unable to obtain relabeling permission\n");
79 selinux_secmark_refcount_inc();
83 static int secmark_tg_check(const struct xt_tgchk_param *par)
85 struct xt_secmark_target_info *info = par->targinfo;
88 if (strcmp(par->table, "mangle") != 0 &&
89 strcmp(par->table, "security") != 0) {
90 pr_info("target only valid in the \'mangle\' "
91 "or \'security\' tables, not \'%s\'.\n", par->table);
95 if (mode && mode != info->mode) {
96 pr_info("mode already set to %hu cannot mix with "
97 "rules for mode %hu\n", mode, info->mode);
101 switch (info->mode) {
102 case SECMARK_MODE_SEL:
103 err = checkentry_selinux(info);
109 pr_info("invalid mode: %hu\n", info->mode);
118 static void secmark_tg_destroy(const struct xt_tgdtor_param *par)
121 case SECMARK_MODE_SEL:
122 selinux_secmark_refcount_dec();
126 static struct xt_target secmark_tg_reg __read_mostly = {
129 .family = NFPROTO_UNSPEC,
130 .checkentry = secmark_tg_check,
131 .destroy = secmark_tg_destroy,
132 .target = secmark_tg,
133 .targetsize = sizeof(struct xt_secmark_target_info),
137 static int __init secmark_tg_init(void)
139 return xt_register_target(&secmark_tg_reg);
142 static void __exit secmark_tg_exit(void)
144 xt_unregister_target(&secmark_tg_reg);
147 module_init(secmark_tg_init);
148 module_exit(secmark_tg_exit);