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authorJan Engelhardt <jengelh@computergmbh.de>2007-12-04 23:38:30 -0800
committerDavid S. Miller <davem@davemloft.net>2008-01-28 14:56:00 -0800
commitf1095ab51d4297d4a84b64a65c71054183a73486 (patch)
tree50b3d4fe6d4a23cf5072fd3a92cf935d1545ba57
parentc9fd49680954714473d6cbd2546d6ff120f96840 (diff)
downloadlinux-f1095ab51d4297d4a84b64a65c71054183a73486.tar.bz2
[NETFILTER]: IPv6 capable xt_tos v1 match
Extends the xt_dscp match by xt_tos v1 to add support for selectively matching any bit in the IPv4 TOS and IPv6 Priority fields. (ipt_tos and xt_dscp only accepted a limited range of possible values.) 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>
-rw-r--r--include/linux/netfilter/xt_dscp.h6
-rw-r--r--net/netfilter/xt_dscp.c32
2 files changed, 38 insertions, 0 deletions
diff --git a/include/linux/netfilter/xt_dscp.h b/include/linux/netfilter/xt_dscp.h
index 1da61e6acaf7..f49bc1a648dc 100644
--- a/include/linux/netfilter/xt_dscp.h
+++ b/include/linux/netfilter/xt_dscp.h
@@ -20,4 +20,10 @@ struct xt_dscp_info {
u_int8_t invert;
};
+struct xt_tos_match_info {
+ u_int8_t tos_mask;
+ u_int8_t tos_value;
+ u_int8_t invert;
+};
+
#endif /* _XT_DSCP_H */
diff --git a/net/netfilter/xt_dscp.c b/net/netfilter/xt_dscp.c
index 75b0df990d4f..834e43720315 100644
--- a/net/netfilter/xt_dscp.c
+++ b/net/netfilter/xt_dscp.c
@@ -23,6 +23,7 @@ MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_dscp");
MODULE_ALIAS("ip6t_dscp");
MODULE_ALIAS("ipt_tos");
+MODULE_ALIAS("ip6t_tos");
static bool
dscp_mt(const struct sk_buff *skb, const struct net_device *in,
@@ -72,6 +73,21 @@ static bool tos_mt_v0(const struct sk_buff *skb, const struct net_device *in,
return (ip_hdr(skb)->tos == info->tos) ^ info->invert;
}
+static bool tos_mt(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_tos_match_info *info = matchinfo;
+
+ if (match->family == AF_INET)
+ return ((ip_hdr(skb)->tos & info->tos_mask) ==
+ info->tos_value) ^ !!info->invert;
+ else
+ return ((ipv6_get_dsfield(ipv6_hdr(skb)) & info->tos_mask) ==
+ info->tos_value) ^ !!info->invert;
+}
+
static struct xt_match dscp_mt_reg[] __read_mostly = {
{
.name = "dscp",
@@ -97,6 +113,22 @@ static struct xt_match dscp_mt_reg[] __read_mostly = {
.matchsize = sizeof(struct ipt_tos_info),
.me = THIS_MODULE,
},
+ {
+ .name = "tos",
+ .revision = 1,
+ .family = AF_INET,
+ .match = tos_mt,
+ .matchsize = sizeof(struct xt_tos_match_info),
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "tos",
+ .revision = 1,
+ .family = AF_INET6,
+ .match = tos_mt,
+ .matchsize = sizeof(struct xt_tos_match_info),
+ .me = THIS_MODULE,
+ },
};
static int __init dscp_mt_init(void)