[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@xxxxxxxxxxxxxxx>
Signed-off-by: Patrick McHardy <kaber@xxxxxxxxx>
---
commit ef44af12ba911ba711ac38989aabfaeee0fedd71
tree 88d954f58ab6413c0104c8ead3d5cdccc8951389
parent 8566a393780f1db8d84bd066f2d1734ffa90d709
author Jan Engelhardt <jengelh@xxxxxxxxxxxxxxx> Tue, 04 Dec 2007 10:47:05 +0100
committer Patrick McHardy <kaber@xxxxxxxxx> Tue, 04 Dec 2007 11:23:37 +0100
include/linux/netfilter/xt_dscp.h | 6 ++++++
net/netfilter/xt_dscp.c | 32 ++++++++++++++++++++++++++++++++
2 files changed, 38 insertions(+), 0 deletions(-)
diff --git a/include/linux/netfilter/xt_dscp.h b/include/linux/netfilter/xt_dscp.h
index 1da61e6..f49bc1a 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 75b0df9..834e437 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)
-
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