-/* 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,
- void *userinfo)
+connmark_tg_v0(struct sk_buff *skb, const struct net_device *in,
+ const struct net_device *out, unsigned int hooknum,
+ const struct xt_target *target, const void *targinfo)
{
const struct xt_connmark_target_info *markinfo = targinfo;
+ struct nf_conn *ct;
+ enum ip_conntrack_info ctinfo;
u_int32_t diff;
- u_int32_t nfmark;
+ u_int32_t mark;
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;
+
+ ct = nf_ct_get(skb, &ctinfo);
+ if (ct) {
+ switch(markinfo->mode) {
+ case XT_CONNMARK_SET:
+ newmark = (ct->mark & ~markinfo->mask) | markinfo->mark;
+ if (newmark != ct->mark) {
+ ct->mark = newmark;
+ nf_conntrack_event_cache(IPCT_MARK, skb);
+ }
+ break;
+ case XT_CONNMARK_SAVE:
+ newmark = (ct->mark & ~markinfo->mask) |
+ (skb->mark & markinfo->mask);
+ if (ct->mark != newmark) {
+ ct->mark = newmark;
+ nf_conntrack_event_cache(IPCT_MARK, skb);
+ }
+ break;
+ case XT_CONNMARK_RESTORE:
+ mark = skb->mark;
+ diff = (ct->mark ^ mark) & markinfo->mask;
+ skb->mark = mark ^ diff;
+ break;
+ }
+ }
+
+ return XT_CONTINUE;
+}
+
+static unsigned int
+connmark_tg(struct sk_buff *skb, const struct net_device *in,
+ const struct net_device *out, unsigned int hooknum,
+ const struct xt_target *target, const void *targinfo)
+{
+ const struct xt_connmark_tginfo1 *info = 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, skb);
+ }
break;
- case XT_CONNMARK_SAVE:
- newmark = (*ctmark & ~markinfo->mask) | ((*pskb)->nfmark & markinfo->mask);
- if (*ctmark != newmark)
- *ctmark = newmark;
+ 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, skb);
+ }
break;
- case XT_CONNMARK_RESTORE:
- nfmark = (*pskb)->nfmark;
- diff = (*ctmark ^ nfmark) & markinfo->mask;
- if (diff != 0)
- (*pskb)->nfmark = nfmark ^ diff;
+ 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 targinfosize,
- unsigned int hook_mask)
+static bool
+connmark_tg_check_v0(const char *tablename, const void *entry,
+ const struct xt_target *target, void *targinfo,
+ unsigned int hook_mask)
{
- struct xt_connmark_target_info *matchinfo = targinfo;
+ const 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 (strcmp(tablename, "mangle") != 0) {
+ printk(KERN_WARNING "CONNMARK: restore can only be "
+ "called from \"mangle\" table, not \"%s\"\n",
+ tablename);
+ return false;
+ }
}
-
if (matchinfo->mark > 0xffffffff || matchinfo->mask > 0xffffffff) {
printk(KERN_WARNING "CONNMARK: Only supports 32bit mark\n");
- return 0;
+ return false;
+ }
+ if (nf_ct_l3proto_try_module_get(target->family) < 0) {
+ printk(KERN_WARNING "can't load conntrack support for "
+ "proto=%u\n", target->family);
+ return false;
}
+ return true;
+}
- return 1;
+static bool
+connmark_tg_check(const char *tablename, const void *entry,
+ const struct xt_target *target, void *targinfo,
+ unsigned int hook_mask)
+{
+ if (nf_ct_l3proto_try_module_get(target->family) < 0) {
+ printk(KERN_WARNING "cannot load conntrack support for "
+ "proto=%u\n", target->family);
+ return false;
+ }
+ return true;
}
-static struct xt_target connmark_reg = {
- .name = "CONNMARK",
- .target = target,
- .targetsize = sizeof(struct xt_connmark_target_info),
- .checkentry = checkentry,
- .me = THIS_MODULE
-};
+static void
+connmark_tg_destroy(const struct xt_target *target, void *targinfo)
+{
+ nf_ct_l3proto_module_put(target->family);
+}
-static struct xt_target connmark6_reg = {
- .name = "CONNMARK",
- .target = target,
- .targetsize = sizeof(struct xt_connmark_target_info),
- .checkentry = checkentry,
- .me = THIS_MODULE
+#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 int __init init(void)
+static void connmark_tg_compat_from_user_v0(void *dst, void *src)
{
- int ret;
-
- need_conntrack();
+ const 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));
+}
- ret = xt_register_target(AF_INET, &connmark_reg);
- if (ret)
- return ret;
+static int connmark_tg_compat_to_user_v0(void __user *dst, void *src)
+{
+ const 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;
+}
+#endif /* CONFIG_COMPAT */
- ret = xt_register_target(AF_INET6, &connmark6_reg);
- if (ret)
- xt_unregister_target(AF_INET, &connmark_reg);
+static struct xt_target connmark_tg_reg[] __read_mostly = {
+ {
+ .name = "CONNMARK",
+ .revision = 0,
+ .family = AF_INET,
+ .checkentry = connmark_tg_check_v0,
+ .destroy = connmark_tg_destroy,
+ .target = connmark_tg_v0,
+ .targetsize = sizeof(struct xt_connmark_target_info),
+#ifdef CONFIG_COMPAT
+ .compatsize = sizeof(struct compat_xt_connmark_target_info),
+ .compat_from_user = connmark_tg_compat_from_user_v0,
+ .compat_to_user = connmark_tg_compat_to_user_v0,
+#endif
+ .me = THIS_MODULE
+ },
+ {
+ .name = "CONNMARK",
+ .revision = 0,
+ .family = AF_INET6,
+ .checkentry = connmark_tg_check_v0,
+ .destroy = connmark_tg_destroy,
+ .target = connmark_tg_v0,
+ .targetsize = sizeof(struct xt_connmark_target_info),
+#ifdef CONFIG_COMPAT
+ .compatsize = sizeof(struct compat_xt_connmark_target_info),
+ .compat_from_user = connmark_tg_compat_from_user_v0,
+ .compat_to_user = connmark_tg_compat_to_user_v0,
+#endif
+ .me = THIS_MODULE
+ },
+ {
+ .name = "CONNMARK",
+ .revision = 1,
+ .family = AF_INET,
+ .checkentry = connmark_tg_check,
+ .target = connmark_tg,
+ .targetsize = sizeof(struct xt_connmark_tginfo1),
+ .destroy = connmark_tg_destroy,
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "CONNMARK",
+ .revision = 1,
+ .family = AF_INET6,
+ .checkentry = connmark_tg_check,
+ .target = connmark_tg,
+ .targetsize = sizeof(struct xt_connmark_tginfo1),
+ .destroy = connmark_tg_destroy,
+ .me = THIS_MODULE,
+ },
+};
- return ret;
+static int __init connmark_tg_init(void)
+{
+ return xt_register_targets(connmark_tg_reg,
+ ARRAY_SIZE(connmark_tg_reg));
}
-static void __exit fini(void)
+static void __exit connmark_tg_exit(void)
{
- xt_unregister_target(AF_INET, &connmark_reg);
- xt_unregister_target(AF_INET6, &connmark6_reg);
+ xt_unregister_targets(connmark_tg_reg, ARRAY_SIZE(connmark_tg_reg));
}
-module_init(init);
-module_exit(fini);
+module_init(connmark_tg_init);
+module_exit(connmark_tg_exit);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff