From 3d483058c8c8b87a167155ca9ddd776dd730bc39 Mon Sep 17 00:00:00 2001 From: Hannes Frederic Sowa Date: Sun, 18 Aug 2013 13:46:52 +0200 Subject: ipv6: wire up skb->encapsulation When pushing a new header before current one call skb_reset_inner_headers to record the position of the inner headers in the various ipv6 tunnel protocols. We later need this to correctly identify the addresses needed to send back an error in the xfrm layer. This change is safe, because skb->protocol is always checked before dereferencing data from the inner protocol. Cc: Steffen Klassert Cc: YOSHIFUJI Hideaki Cc: Nicolas Dichtel Acked-by: Eric Dumazet Signed-off-by: Hannes Frederic Sowa Signed-off-by: Steffen Klassert --- net/ipv6/ip6_gre.c | 5 +++++ net/ipv6/ip6_tunnel.c | 6 ++++++ net/ipv6/sit.c | 5 +++++ 3 files changed, 16 insertions(+) diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c index ecd60733e5e2..90747f1973fe 100644 --- a/net/ipv6/ip6_gre.c +++ b/net/ipv6/ip6_gre.c @@ -724,6 +724,11 @@ static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb, ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); } + if (likely(!skb->encapsulation)) { + skb_reset_inner_headers(skb); + skb->encapsulation = 1; + } + skb_push(skb, gre_hlen); skb_reset_network_header(skb); skb_set_transport_header(skb, sizeof(*ipv6h)); diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c index 1e55866cead7..46ba243605a3 100644 --- a/net/ipv6/ip6_tunnel.c +++ b/net/ipv6/ip6_tunnel.c @@ -1027,6 +1027,12 @@ static int ip6_tnl_xmit2(struct sk_buff *skb, init_tel_txopt(&opt, encap_limit); ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); } + + if (likely(!skb->encapsulation)) { + skb_reset_inner_headers(skb); + skb->encapsulation = 1; + } + skb_push(skb, sizeof(struct ipv6hdr)); skb_reset_network_header(skb); ipv6h = ipv6_hdr(skb); diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c index a3437a4cd07e..fbfc5a83867f 100644 --- a/net/ipv6/sit.c +++ b/net/ipv6/sit.c @@ -888,6 +888,11 @@ static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb, ttl = iph6->hop_limit; tos = INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6)); + if (likely(!skb->encapsulation)) { + skb_reset_inner_headers(skb); + skb->encapsulation = 1; + } + err = iptunnel_xmit(dev_net(dev), rt, skb, fl4.saddr, fl4.daddr, IPPROTO_IPV6, tos, ttl, df); iptunnel_xmit_stats(err, &dev->stats, dev->tstats); -- cgit v1.2.3