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Diffstat (limited to 'net/netfilter/xt_CONNMARK.c')
-rw-r--r--net/netfilter/xt_CONNMARK.c150
1 files changed, 113 insertions, 37 deletions
diff --git a/net/netfilter/xt_CONNMARK.c b/net/netfilter/xt_CONNMARK.c
index 0621ca7de3b..5fecfb4794b 100644
--- a/net/netfilter/xt_CONNMARK.c
+++ b/net/netfilter/xt_CONNMARK.c
@@ -1,8 +1,10 @@
-/* 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
@@ -24,7 +26,7 @@
#include <net/checksum.h>
MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>");
-MODULE_DESCRIPTION("IP tables CONNMARK matching module");
+MODULE_DESCRIPTION("Xtables: connection mark modification");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_CONNMARK");
MODULE_ALIAS("ip6t_CONNMARK");
@@ -34,12 +36,9 @@ MODULE_ALIAS("ip6t_CONNMARK");
#include <net/netfilter/nf_conntrack_ecache.h>
static unsigned int
-target(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)
+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;
@@ -77,12 +76,50 @@ target(struct sk_buff *skb,
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 = (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:
+ newmark = (skb->mark & ~info->nfmask) ^
+ (ct->mark & info->ctmask);
+ skb->mark = newmark;
+ break;
+ }
+
+ return XT_CONTINUE;
+}
+
static bool
-checkentry(const char *tablename,
- const void *entry,
- const struct xt_target *target,
- void *targinfo,
- unsigned int hook_mask)
+connmark_tg_check_v0(const char *tablename, const void *entry,
+ const struct xt_target *target, void *targinfo,
+ unsigned int hook_mask)
{
const struct xt_connmark_target_info *matchinfo = targinfo;
@@ -100,14 +137,27 @@ checkentry(const char *tablename,
}
if (nf_ct_l3proto_try_module_get(target->family) < 0) {
printk(KERN_WARNING "can't load conntrack support for "
- "proto=%d\n", target->family);
+ "proto=%u\n", target->family);
+ return false;
+ }
+ return true;
+}
+
+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 void
-destroy(const struct xt_target *target, void *targinfo)
+connmark_tg_destroy(const struct xt_target *target, void *targinfo)
{
nf_ct_l3proto_module_put(target->family);
}
@@ -120,7 +170,7 @@ struct compat_xt_connmark_target_info {
u_int16_t __pad2;
};
-static void compat_from_user(void *dst, void *src)
+static void connmark_tg_compat_from_user_v0(void *dst, void *src)
{
const struct compat_xt_connmark_target_info *cm = src;
struct xt_connmark_target_info m = {
@@ -131,7 +181,7 @@ static void compat_from_user(void *dst, void *src)
memcpy(dst, &m, sizeof(m));
}
-static int compat_to_user(void __user *dst, void *src)
+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 = {
@@ -143,43 +193,69 @@ static int compat_to_user(void __user *dst, void *src)
}
#endif /* CONFIG_COMPAT */
-static struct xt_target xt_connmark_target[] __read_mostly = {
+static struct xt_target connmark_tg_reg[] __read_mostly = {
{
.name = "CONNMARK",
+ .revision = 0,
.family = AF_INET,
- .checkentry = checkentry,
- .destroy = destroy,
- .target = target,
+ .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 = compat_from_user,
- .compat_to_user = compat_to_user,
+ .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 = checkentry,
- .destroy = destroy,
- .target = target,
+ .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,
+ },
};
-static int __init xt_connmark_init(void)
+static int __init connmark_tg_init(void)
{
- return xt_register_targets(xt_connmark_target,
- ARRAY_SIZE(xt_connmark_target));
+ return xt_register_targets(connmark_tg_reg,
+ ARRAY_SIZE(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_targets(connmark_tg_reg, ARRAY_SIZE(connmark_tg_reg));
}
-module_init(xt_connmark_init);
-module_exit(xt_connmark_fini);
+module_init(connmark_tg_init);
+module_exit(connmark_tg_exit);
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-26 01:33:39 +0000