[NETFILTER]: xt_connmark match, revision 1

Introduces the xt_connmark match revision 1. It uses fixed types,
eventually obsoleting revision 0 some day (uses nonfixed types).
(Unfixed types like "unsigned long" do not play well with mixed
user-/kernelspace "bitness", e.g. 32/64, as is common on SPARC64,
and need extra compat code.)

Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 71 insertions, 17 deletions

diff --git a/net/netfilter/xt_connmark.c b/net/netfilter/xt_connmark.c
index 8ad875bc1589..55c62350b1f2 100644
--- a/net/netfilter/xt_connmark.c
+++ b/net/netfilter/xt_connmark.c
@@ -1,8 +1,10 @@
-/* This kernel module matches connection mark values set by the
- * CONNMARK target
+/*
+ *      xt_connmark - Netfilter module to match 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
@@ -37,6 +39,23 @@ connmark_mt(const struct sk_buff *skb, const struct net_device *in,
             const void *matchinfo, int offset, unsigned int protoff,
             bool *hotdrop)
 {
+        const struct xt_connmark_mtinfo1 *info = 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 bool
+connmark_mt_v0(const struct sk_buff *skb, const struct net_device *in,
+               const struct net_device *out, const struct xt_match *match,
+               const void *matchinfo, int offset, unsigned int protoff,
+               bool *hotdrop)
+{
         const struct xt_connmark_info *info = matchinfo;
         const struct nf_conn *ct;
         enum ip_conntrack_info ctinfo;
@@ -49,9 +68,9 @@ connmark_mt(const struct sk_buff *skb, const struct net_device *in,
 }
 
 static bool
-connmark_mt_check(const char *tablename, const void *ip,
-                  const struct xt_match *match, void *matchinfo,
-                  unsigned int hook_mask)
+connmark_mt_check_v0(const char *tablename, const void *ip,
+                     const struct xt_match *match, void *matchinfo,
+                     unsigned int hook_mask)
 {
         const struct xt_connmark_info *cm = matchinfo;
 
@@ -67,6 +86,19 @@ connmark_mt_check(const char *tablename, const void *ip,
         return true;
 }
 
+static bool
+connmark_mt_check(const char *tablename, const void *ip,
+                  const struct xt_match *match, void *matchinfo,
+                  unsigned int hook_mask)
+{
+        if (nf_ct_l3proto_try_module_get(match->family) < 0) {
+                printk(KERN_WARNING "cannot load conntrack support for "
+                       "proto=%u\n", match->family);
+                return false;
+        }
+        return true;
+}
+
 static void
 connmark_mt_destroy(const struct xt_match *match, void *matchinfo)
 {
@@ -81,7 +113,7 @@ struct compat_xt_connmark_info {
         u_int16_t       __pad2;
 };
 
-static void connmark_mt_compat_from_user(void *dst, void *src)
+static void connmark_mt_compat_from_user_v0(void *dst, void *src)
 {
         const struct compat_xt_connmark_info *cm = src;
         struct xt_connmark_info m = {
@@ -92,7 +124,7 @@ static void connmark_mt_compat_from_user(void *dst, void *src)
         memcpy(dst, &m, sizeof(m));
 }
 
-static int connmark_mt_compat_to_user(void __user *dst, void *src)
+static int connmark_mt_compat_to_user_v0(void __user *dst, void *src)
 {
         const struct xt_connmark_info *m = src;
         struct compat_xt_connmark_info cm = {
@@ -107,32 +139,54 @@ static int connmark_mt_compat_to_user(void __user *dst, void *src)
 static struct xt_match connmark_mt_reg[] __read_mostly = {
         {
                 .name           = "connmark",
+                .revision       = 0,
                 .family         = AF_INET,
-                .checkentry     = connmark_mt_check,
-                .match          = connmark_mt,
+                .checkentry     = connmark_mt_check_v0,
+                .match          = connmark_mt_v0,
                 .destroy        = connmark_mt_destroy,
                 .matchsize      = sizeof(struct xt_connmark_info),
 #ifdef CONFIG_COMPAT
                 .compatsize     = sizeof(struct compat_xt_connmark_info),
-                .compat_from_user = connmark_mt_compat_from_user,
-                .compat_to_user = connmark_mt_compat_to_user,
+                .compat_from_user = connmark_mt_compat_from_user_v0,
+                .compat_to_user = connmark_mt_compat_to_user_v0,
 #endif
                 .me             = THIS_MODULE
         },
         {
                 .name           = "connmark",
+                .revision       = 0,
                 .family         = AF_INET6,
-                .checkentry     = connmark_mt_check,
-                .match          = connmark_mt,
+                .checkentry     = connmark_mt_check_v0,
+                .match          = connmark_mt_v0,
                 .destroy        = connmark_mt_destroy,
                 .matchsize      = sizeof(struct xt_connmark_info),
 #ifdef CONFIG_COMPAT
                 .compatsize     = sizeof(struct compat_xt_connmark_info),
-                .compat_from_user = connmark_mt_compat_from_user,
-                .compat_to_user = connmark_mt_compat_to_user,
+                .compat_from_user = connmark_mt_compat_from_user_v0,
+                .compat_to_user = connmark_mt_compat_to_user_v0,
 #endif
                 .me             = THIS_MODULE
         },
+        {
+                .name           = "connmark",
+                .revision       = 1,
+                .family         = AF_INET,
+                .checkentry     = connmark_mt_check,
+                .match          = connmark_mt,
+                .matchsize      = sizeof(struct xt_connmark_mtinfo1),
+                .destroy        = connmark_mt_destroy,
+                .me             = THIS_MODULE,
+        },
+        {
+                .name           = "connmark",
+                .revision       = 1,
+                .family         = AF_INET6,
+                .checkentry     = connmark_mt_check,
+                .match          = connmark_mt,
+                .matchsize      = sizeof(struct xt_connmark_mtinfo1),
+                .destroy        = connmark_mt_destroy,
+                .me             = THIS_MODULE,
+        },
 };
 
 static int __init connmark_mt_init(void)