From 4319cc0cf5bb894b7368008cdf6dd20eb8868018 Mon Sep 17 00:00:00 2001 From: Fernando Luis Vazquez Cao Date: Tue, 10 May 2011 09:55:44 +0200 Subject: [PATCH] netfilter: IPv6: initialize TOS field in REJECT target module 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 Signed-off-by: Pablo Neira Ayuso --- net/ipv6/netfilter/ip6t_REJECT.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/net/ipv6/netfilter/ip6t_REJECT.c b/net/ipv6/netfilter/ip6t_REJECT.c index 28e74488a329..a5a4c5dd5396 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); -- 2.20.1