-/* This kernel module matches connection mark values set by the
- * CONNMARK target
+/*
+ * xt_connmark - Netfilter module to operate on connection marks
*
- * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
- * by Henrik Nordstrom <hno@marasystems.com>
+ * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com>
+ * by Henrik Nordstrom <hno@marasystems.com>
+ * Copyright © CC Computer Consultants GmbH, 2007 - 2008
+ * Jan Engelhardt <jengelh@medozas.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#include <linux/module.h>
#include <linux/skbuff.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_ecache.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_connmark.h>
-MODULE_AUTHOR("Henrik Nordstrom <hno@marasytems.com>");
-MODULE_DESCRIPTION("IP tables connmark match module");
+MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>");
+MODULE_DESCRIPTION("Xtables: connection mark operations");
MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_CONNMARK");
+MODULE_ALIAS("ip6t_CONNMARK");
MODULE_ALIAS("ipt_connmark");
+MODULE_ALIAS("ip6t_connmark");
-#include <linux/netfilter/x_tables.h>
-#include <linux/netfilter/xt_connmark.h>
-#include <net/netfilter/nf_conntrack_compat.h>
-
-static int
-match(const struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- const void *matchinfo,
- int offset,
- unsigned int protoff,
- int *hotdrop)
+static unsigned int
+connmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
+{
+ const struct xt_connmark_tginfo1 *info = par->targinfo;
+ enum ip_conntrack_info ctinfo;
+ struct nf_conn *ct;
+ u_int32_t newmark;
+
+ ct = nf_ct_get(skb, &ctinfo);
+ if (ct == NULL)
+ return XT_CONTINUE;
+
+ switch (info->mode) {
+ case XT_CONNMARK_SET:
+ newmark = (ct->mark & ~info->ctmask) ^ info->ctmark;
+ if (ct->mark != newmark) {
+ ct->mark = newmark;
+ nf_conntrack_event_cache(IPCT_MARK, ct);
+ }
+ break;
+ case XT_CONNMARK_SAVE:
+ newmark = (ct->mark & ~info->ctmask) ^
+ (skb->mark & info->nfmask);
+ if (ct->mark != newmark) {
+ ct->mark = newmark;
+ nf_conntrack_event_cache(IPCT_MARK, ct);
+ }
+ break;
+ case XT_CONNMARK_RESTORE:
+ newmark = (skb->mark & ~info->nfmask) ^
+ (ct->mark & info->ctmask);
+ skb->mark = newmark;
+ break;
+ }
+
+ return XT_CONTINUE;
+}
+
+static int connmark_tg_check(const struct xt_tgchk_param *par)
{
- const struct xt_connmark_info *info = matchinfo;
- u_int32_t ctinfo;
- const u_int32_t *ctmark = nf_ct_get_mark(skb, &ctinfo);
- if (!ctmark)
- return 0;
+ int ret;
- return (((*ctmark) & info->mask) == info->mark) ^ info->invert;
+ ret = nf_ct_l3proto_try_module_get(par->family);
+ if (ret < 0)
+ pr_info("cannot load conntrack support for proto=%u\n",
+ par->family);
+ return ret;
}
-static int
-checkentry(const char *tablename,
- const void *ip,
- void *matchinfo,
- unsigned int matchsize,
- unsigned int hook_mask)
+static void connmark_tg_destroy(const struct xt_tgdtor_param *par)
{
- struct xt_connmark_info *cm = (struct xt_connmark_info *)matchinfo;
+ nf_ct_l3proto_module_put(par->family);
+}
- if (cm->mark > 0xffffffff || cm->mask > 0xffffffff) {
- printk(KERN_WARNING "connmark: only support 32bit mark\n");
- return 0;
- }
- return 1;
+static bool
+connmark_mt(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ const struct xt_connmark_mtinfo1 *info = par->matchinfo;
+ enum ip_conntrack_info ctinfo;
+ const struct nf_conn *ct;
+
+ ct = nf_ct_get(skb, &ctinfo);
+ if (ct == NULL)
+ return false;
+
+ return ((ct->mark & info->mask) == info->mark) ^ info->invert;
+}
+
+static int connmark_mt_check(const struct xt_mtchk_param *par)
+{
+ int ret;
+
+ ret = nf_ct_l3proto_try_module_get(par->family);
+ if (ret < 0)
+ pr_info("cannot load conntrack support for proto=%u\n",
+ par->family);
+ return ret;
}
-static struct xt_match connmark_match = {
- .name = "connmark",
- .match = match,
- .matchsize = sizeof(struct xt_connmark_info),
- .checkentry = checkentry,
- .me = THIS_MODULE
+static void connmark_mt_destroy(const struct xt_mtdtor_param *par)
+{
+ nf_ct_l3proto_module_put(par->family);
+}
+
+static struct xt_target connmark_tg_reg __read_mostly = {
+ .name = "CONNMARK",
+ .revision = 1,
+ .family = NFPROTO_UNSPEC,
+ .checkentry = connmark_tg_check,
+ .target = connmark_tg,
+ .targetsize = sizeof(struct xt_connmark_tginfo1),
+ .destroy = connmark_tg_destroy,
+ .me = THIS_MODULE,
};
-static struct xt_match connmark6_match = {
- .name = "connmark",
- .match = match,
- .matchsize = sizeof(struct xt_connmark_info),
- .checkentry = checkentry,
- .me = THIS_MODULE
+static struct xt_match connmark_mt_reg __read_mostly = {
+ .name = "connmark",
+ .revision = 1,
+ .family = NFPROTO_UNSPEC,
+ .checkentry = connmark_mt_check,
+ .match = connmark_mt,
+ .matchsize = sizeof(struct xt_connmark_mtinfo1),
+ .destroy = connmark_mt_destroy,
+ .me = THIS_MODULE,
};
-static int __init init(void)
+static int __init connmark_mt_init(void)
{
int ret;
- need_conntrack();
-
- ret = xt_register_match(AF_INET, &connmark_match);
- if (ret)
+ ret = xt_register_target(&connmark_tg_reg);
+ if (ret < 0)
return ret;
-
- ret = xt_register_match(AF_INET6, &connmark6_match);
- if (ret)
- xt_unregister_match(AF_INET, &connmark_match);
- return ret;
+ ret = xt_register_match(&connmark_mt_reg);
+ if (ret < 0) {
+ xt_unregister_target(&connmark_tg_reg);
+ return ret;
+ }
+ return 0;
}
-static void __exit fini(void)
+static void __exit connmark_mt_exit(void)
{
- xt_unregister_match(AF_INET6, &connmark6_match);
- xt_unregister_match(AF_INET, &connmark_match);
+ xt_unregister_match(&connmark_mt_reg);
+ xt_unregister_target(&connmark_tg_reg);
}
-module_init(init);
-module_exit(fini);
+module_init(connmark_mt_init);
+module_exit(connmark_mt_exit);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff