-/* This kernel module is used to modify the connection mark values, or
- * to optionally restore the skb nfmark from the connection mark
+/*
+ * xt_CONNMARK - Netfilter module to modify the connection mark values
*
- * 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@computergmbh.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/ip.h>
#include <net/checksum.h>
-MODULE_AUTHOR("Henrik Nordstrom <hno@marasytems.com>");
-MODULE_DESCRIPTION("IP tables CONNMARK matching module");
+MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>");
+MODULE_DESCRIPTION("Xtables: connection mark modification");
MODULE_LICENSE("GPL");
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>
+#include <net/netfilter/nf_conntrack_ecache.h>
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)
+connmark_tg(struct sk_buff *skb, const struct xt_target_param *par)
{
- const struct xt_connmark_target_info *markinfo = targinfo;
- u_int32_t diff;
- u_int32_t mark;
+ const struct xt_connmark_tginfo1 *info = par->targinfo;
+ enum ip_conntrack_info ctinfo;
+ struct nf_conn *ct;
u_int32_t newmark;
- u_int32_t ctinfo;
- u_int32_t *ctmark = nf_ct_get_mark(*pskb, &ctinfo);
- if (ctmark) {
- switch(markinfo->mode) {
- case XT_CONNMARK_SET:
- newmark = (*ctmark & ~markinfo->mask) | markinfo->mark;
- if (newmark != *ctmark) {
- *ctmark = newmark;
-#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE)
- ip_conntrack_event_cache(IPCT_MARK, *pskb);
-#else
- nf_conntrack_event_cache(IPCT_MARK, *pskb);
-#endif
+ 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 = (*ctmark & ~markinfo->mask) |
- ((*pskb)->mark & markinfo->mask);
- if (*ctmark != newmark) {
- *ctmark = newmark;
-#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE)
- ip_conntrack_event_cache(IPCT_MARK, *pskb);
-#else
- nf_conntrack_event_cache(IPCT_MARK, *pskb);
-#endif
- }
- break;
- case XT_CONNMARK_RESTORE:
- mark = (*pskb)->mark;
- diff = (*ctmark ^ mark) & markinfo->mask;
- if (diff != 0)
- (*pskb)->mark = mark ^ diff;
- break;
+ 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
-checkentry(const char *tablename,
- const void *entry,
- const struct xt_target *target,
- void *targinfo,
- unsigned int hook_mask)
+static bool connmark_tg_check(const struct xt_tgchk_param *par)
{
- struct xt_connmark_target_info *matchinfo = targinfo;
-
- if (matchinfo->mode == XT_CONNMARK_RESTORE) {
- if (strcmp(tablename, "mangle") != 0) {
- printk(KERN_WARNING "CONNMARK: restore can only be "
- "called from \"mangle\" table, not \"%s\"\n",
- tablename);
- return 0;
- }
+ if (nf_ct_l3proto_try_module_get(par->family) < 0) {
+ printk(KERN_WARNING "cannot load conntrack support for "
+ "proto=%u\n", par->family);
+ return false;
}
- if (matchinfo->mark > 0xffffffff || matchinfo->mask > 0xffffffff) {
- printk(KERN_WARNING "CONNMARK: Only supports 32bit mark\n");
- return 0;
- }
- return 1;
-}
-
-#ifdef CONFIG_COMPAT
-struct compat_xt_connmark_target_info {
- compat_ulong_t mark, mask;
- u_int8_t mode;
- u_int8_t __pad1;
- u_int16_t __pad2;
-};
-
-static void compat_from_user(void *dst, void *src)
-{
- struct compat_xt_connmark_target_info *cm = src;
- struct xt_connmark_target_info m = {
- .mark = cm->mark,
- .mask = cm->mask,
- .mode = cm->mode,
- };
- memcpy(dst, &m, sizeof(m));
+ return true;
}
-static int compat_to_user(void __user *dst, void *src)
+static void connmark_tg_destroy(const struct xt_tgdtor_param *par)
{
- struct xt_connmark_target_info *m = src;
- struct compat_xt_connmark_target_info cm = {
- .mark = m->mark,
- .mask = m->mask,
- .mode = m->mode,
- };
- return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0;
+ nf_ct_l3proto_module_put(par->family);
}
-#endif /* CONFIG_COMPAT */
-static struct xt_target xt_connmark_target[] = {
- {
- .name = "CONNMARK",
- .family = AF_INET,
- .checkentry = checkentry,
- .target = target,
- .targetsize = sizeof(struct xt_connmark_target_info),
-#ifdef CONFIG_COMPAT
- .compatsize = sizeof(struct compat_xt_connmark_target_info),
- .compat_from_user = compat_from_user,
- .compat_to_user = compat_to_user,
-#endif
- .me = THIS_MODULE
- },
- {
- .name = "CONNMARK",
- .family = AF_INET6,
- .checkentry = checkentry,
- .target = target,
- .targetsize = sizeof(struct xt_connmark_target_info),
- .me = THIS_MODULE
- },
+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 int __init xt_connmark_init(void)
+static int __init connmark_tg_init(void)
{
- need_conntrack();
- return xt_register_targets(xt_connmark_target,
- ARRAY_SIZE(xt_connmark_target));
+ return xt_register_target(&connmark_tg_reg);
}
-static void __exit xt_connmark_fini(void)
+static void __exit connmark_tg_exit(void)
{
- xt_unregister_targets(xt_connmark_target,
- ARRAY_SIZE(xt_connmark_target));
+ xt_unregister_target(&connmark_tg_reg);
}
-module_init(xt_connmark_init);
-module_exit(xt_connmark_fini);
+module_init(connmark_tg_init);
+module_exit(connmark_tg_exit);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff