[PATCH 1/2] netfilter: IPv6: initialize TOS field in REJECT target module

[pablo@netfilter.org]

From: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>

The IPv6 header is not zeroed out in alloc_skb so we must initialize
it properly unless we want to see IPv6 packets with random TOS fields
floating around. The current implementation resets the flow label
but this could be changed if deemed necessary.

We stumbled upon this issue when trying to apply a mangle rule to
the RST packet generated by the REJECT target module.

The following Linux kernels are affected: <= 2.6.38.8

Cc: stable@kernel.org
Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
(cherry picked from commit 4319cc0cf5bb894b7368008cdf6dd20eb8868018)
---
 net/ipv6/netfilter/ip6t_REJECT.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/net/ipv6/netfilter/ip6t_REJECT.c b/net/ipv6/netfilter/ip6t_REJECT.c
index 28e7448..a5a4c5d 100644
--- a/net/ipv6/netfilter/ip6t_REJECT.c
+++ b/net/ipv6/netfilter/ip6t_REJECT.c
@@ -45,6 +45,8 @@ static void send_reset(struct net *net, struct sk_buff *oldskb)
 	int tcphoff, needs_ack;
 	const struct ipv6hdr *oip6h = ipv6_hdr(oldskb);
 	struct ipv6hdr *ip6h;
+#define DEFAULT_TOS_VALUE	0x0U
+	const __u8 tclass = DEFAULT_TOS_VALUE;
 	struct dst_entry *dst = NULL;
 	u8 proto;
 	struct flowi6 fl6;
@@ -124,7 +126,7 @@ static void send_reset(struct net *net, struct sk_buff *oldskb)
 	skb_put(nskb, sizeof(struct ipv6hdr));
 	skb_reset_network_header(nskb);
 	ip6h = ipv6_hdr(nskb);
-	ip6h->version = 6;
+	*(__be32 *)ip6h =  htonl(0x60000000 | (tclass << 20));
 	ip6h->hop_limit = ip6_dst_hoplimit(dst);
 	ip6h->nexthdr = IPPROTO_TCP;
 	ipv6_addr_copy(&ip6h->saddr, &oip6h->daddr);
-- 
1.7.2.5