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authorFernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>2011-05-10 09:55:44 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2011-06-23 15:28:42 -0700
commitfd1aa48ee98eb70abeb51f8bbe1700393980f05b (patch)
parent4bcfb455c442fc3343d14d8687254aaaa2f3d4cd (diff)
netfilter: IPv6: initialize TOS field in REJECT target module
commit 4319cc0cf5bb894b7368008cdf6dd20eb8868018 upstream. 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. Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
1 files changed, 3 insertions, 1 deletions
diff --git a/net/ipv6/netfilter/ip6t_REJECT.c b/net/ipv6/netfilter/ip6t_REJECT.c
index 35ae554d7ace..423366203383 100644
--- a/net/ipv6/netfilter/ip6t_REJECT.c
+++ b/net/ipv6/netfilter/ip6t_REJECT.c
@@ -43,6 +43,8 @@ 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;
+ const __u8 tclass = DEFAULT_TOS_VALUE;
struct dst_entry *dst = NULL;
u8 proto;
struct flowi fl;
@@ -121,7 +123,7 @@ static void send_reset(struct net *net, struct sk_buff *oldskb)
skb_put(nskb, sizeof(struct ipv6hdr));
ip6h = ipv6_hdr(nskb);
- ip6h->version = 6;
+ *(__be32 *)ip6h = htonl(0x60000000 | (tclass << 20));
ip6h->hop_limit = dst_metric(dst, RTAX_HOPLIMIT);
ip6h->nexthdr = IPPROTO_TCP;
ipv6_addr_copy(&ip6h->saddr, &oip6h->daddr);