Import xt_tos v1 target
Extends the xt_DSCP target by xt_TOS v1 to add support for selectively
setting and flipping 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>
---
include/linux/netfilter/xt_DSCP.h | 5 +++
net/netfilter/Kconfig | 2 -
net/netfilter/xt_DSCP.c | 63 ++++++++++++++++++++++++++++++++++++++
3 files changed, 69 insertions(+), 1 deletion(-)
Index: linux-2.6/include/linux/netfilter/xt_DSCP.h
===================================================================
--- linux-2.6.orig/include/linux/netfilter/xt_DSCP.h
+++ linux-2.6/include/linux/netfilter/xt_DSCP.h
@@ -17,4 +17,9 @@ struct xt_DSCP_info {
u_int8_t dscp;
};
+struct xt_tos_target_info {
+ u_int8_t tos_value;
+ u_int8_t tos_mask;
+};
+
#endif /* _XT_DSCP_TARGET_H */
Index: linux-2.6/net/netfilter/Kconfig
===================================================================
--- linux-2.6.orig/net/netfilter/Kconfig
+++ linux-2.6/net/netfilter/Kconfig
@@ -304,7 +304,7 @@ config NETFILTER_XT_TARGET_DSCP
It also adds the "TOS" target, which allows you to create rules in
the "mangle" table which alter the Type Of Service field of an IPv4
- packet prior to routing.
+ or the Priority field of an IPv6 packet, prior to routing.
To compile it as a module, choose M here. If unsure, say N.
Index: linux-2.6/net/netfilter/xt_DSCP.c
===================================================================
--- linux-2.6.orig/net/netfilter/xt_DSCP.c
+++ linux-2.6/net/netfilter/xt_DSCP.c
@@ -26,6 +26,7 @@ MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_DSCP");
MODULE_ALIAS("ip6t_DSCP");
MODULE_ALIAS("ipt_TOS");
+MODULE_ALIAS("ip6t_TOS");
static unsigned int
dscp_tg(struct sk_buff *skb, const struct net_device *in,
@@ -117,6 +118,50 @@ tos_tg_check_v0(const char *tablename, c
return true;
}
+static unsigned int
+tos_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_tos_target_info *info = targinfo;
+ struct iphdr *iph = ip_hdr(skb);
+ u_int8_t orig, nv;
+
+ orig = ipv4_get_dsfield(iph);
+ nv = (orig & info->tos_mask) ^ info->tos_value;
+
+ if (orig != nv) {
+ if (!skb_make_writable(skb, sizeof(struct iphdr)))
+ return NF_DROP;
+ iph = ip_hdr(skb);
+ ipv4_change_dsfield(iph, ~0, nv);
+ }
+
+ return XT_CONTINUE;
+}
+
+static unsigned int
+tos_tg6(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_tos_target_info *info = targinfo;
+ struct ipv6hdr *iph = ipv6_hdr(skb);
+ u_int8_t orig, nv;
+
+ orig = ipv6_get_dsfield(iph);
+ nv = (orig & info->tos_mask) ^ info->tos_value;
+
+ if (orig != nv) {
+ if (!skb_make_writable(skb, sizeof(struct iphdr)))
+ return NF_DROP;
+ iph = ipv6_hdr(skb);
+ ipv6_change_dsfield(iph, ~0, nv);
+ }
+
+ return XT_CONTINUE;
+}
+
static struct xt_target dscp_tg_reg[] __read_mostly = {
{
.name = "DSCP",
@@ -146,6 +191,24 @@ static struct xt_target dscp_tg_reg[] __
.checkentry = tos_tg_check_v0,
.me = THIS_MODULE,
},
+ {
+ .name = "TOS",
+ .revision = 1,
+ .family = AF_INET,
+ .table = "mangle",
+ .target = tos_tg,
+ .targetsize = sizeof(struct xt_tos_target_info),
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "TOS",
+ .revision = 1,
+ .family = AF_INET6,
+ .table = "mangle",
+ .target = tos_tg6,
+ .targetsize = sizeof(struct xt_tos_target_info),
+ .me = THIS_MODULE,
+ },
};
static int __init dscp_tg_init(void)
-
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