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- /*
- * This module is used to copy security markings from packets
- * to connections, and restore security markings from connections
- * back to packets. This would normally be performed in conjunction
- * with the SECMARK target and state match.
- *
- * Based somewhat on CONNMARK:
- * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
- * by Henrik Nordstrom <hno@marasystems.com>
- *
- * (C) 2006 Red Hat, Inc., James Morris <jmorris@redhat.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- */
- #include <linux/module.h>
- #include <linux/skbuff.h>
- #include <linux/netfilter/x_tables.h>
- #include <linux/netfilter/xt_CONNSECMARK.h>
- #include <net/netfilter/nf_conntrack_compat.h>
- #define PFX "CONNSECMARK: "
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("James Morris <jmorris@redhat.com>");
- MODULE_DESCRIPTION("ip[6]tables CONNSECMARK module");
- MODULE_ALIAS("ipt_CONNSECMARK");
- MODULE_ALIAS("ip6t_CONNSECMARK");
- /*
- * If the packet has a security mark and the connection does not, copy
- * the security mark from the packet to the connection.
- */
- static void secmark_save(struct sk_buff *skb)
- {
- if (skb->secmark) {
- u32 *connsecmark;
- enum ip_conntrack_info ctinfo;
- connsecmark = nf_ct_get_secmark(skb, &ctinfo);
- if (connsecmark && !*connsecmark)
- *connsecmark = skb->secmark;
- }
- }
- /*
- * If packet has no security mark, and the connection does, restore the
- * security mark from the connection to the packet.
- */
- static void secmark_restore(struct sk_buff *skb)
- {
- if (!skb->secmark) {
- u32 *connsecmark;
- enum ip_conntrack_info ctinfo;
- connsecmark = nf_ct_get_secmark(skb, &ctinfo);
- if (connsecmark && *connsecmark)
- skb->secmark = *connsecmark;
- }
- }
- static unsigned int target(struct sk_buff **pskb, const struct net_device *in,
- const struct net_device *out, unsigned int hooknum,
- const struct xt_target *target,
- const void *targinfo)
- {
- struct sk_buff *skb = *pskb;
- const struct xt_connsecmark_target_info *info = targinfo;
- switch (info->mode) {
- case CONNSECMARK_SAVE:
- secmark_save(skb);
- break;
- case CONNSECMARK_RESTORE:
- secmark_restore(skb);
- break;
- default:
- BUG();
- }
- return XT_CONTINUE;
- }
- static int checkentry(const char *tablename, const void *entry,
- const struct xt_target *target, void *targinfo,
- unsigned int hook_mask)
- {
- struct xt_connsecmark_target_info *info = targinfo;
- if (nf_ct_l3proto_try_module_get(target->family) < 0) {
- printk(KERN_WARNING "can't load conntrack support for "
- "proto=%d\n", target->family);
- return 0;
- }
- switch (info->mode) {
- case CONNSECMARK_SAVE:
- case CONNSECMARK_RESTORE:
- break;
- default:
- printk(KERN_INFO PFX "invalid mode: %hu\n", info->mode);
- return 0;
- }
- return 1;
- }
- static void
- destroy(const struct xt_target *target, void *targinfo)
- {
- nf_ct_l3proto_module_put(target->family);
- }
- static struct xt_target xt_connsecmark_target[] = {
- {
- .name = "CONNSECMARK",
- .family = AF_INET,
- .checkentry = checkentry,
- .destroy = destroy,
- .target = target,
- .targetsize = sizeof(struct xt_connsecmark_target_info),
- .table = "mangle",
- .me = THIS_MODULE,
- },
- {
- .name = "CONNSECMARK",
- .family = AF_INET6,
- .checkentry = checkentry,
- .destroy = destroy,
- .target = target,
- .targetsize = sizeof(struct xt_connsecmark_target_info),
- .table = "mangle",
- .me = THIS_MODULE,
- },
- };
- static int __init xt_connsecmark_init(void)
- {
- return xt_register_targets(xt_connsecmark_target,
- ARRAY_SIZE(xt_connsecmark_target));
- }
- static void __exit xt_connsecmark_fini(void)
- {
- xt_unregister_targets(xt_connsecmark_target,
- ARRAY_SIZE(xt_connsecmark_target));
- }
- module_init(xt_connsecmark_init);
- module_exit(xt_connsecmark_fini);
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