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authorHannes Frederic Sowa <hannes@stressinduktion.org>2013-08-18 13:46:52 +0200
committerSteffen Klassert <steffen.klassert@secunet.com>2013-08-19 09:37:46 +0200
commit3d483058c8c8b87a167155ca9ddd776dd730bc39 (patch)
treee328408bd4bca5348211bd939a53e002bf256349
parent0ea9d5e3e0e03a63b11392f5613378977dae7eca (diff)
downloadlinux-3d483058c8c8b87a167155ca9ddd776dd730bc39.tar.gz
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 <steffen.klassert@secunet.com> Cc: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
-rw-r--r--net/ipv6/ip6_gre.c5
-rw-r--r--net/ipv6/ip6_tunnel.c6
-rw-r--r--net/ipv6/sit.c5
3 files changed, 16 insertions, 0 deletions
diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index ecd6073..90747f1 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 1e55866..46ba243 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 a3437a4..fbfc5a8 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);