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authorXin Long <lucien.xin@gmail.com>2020-04-10 11:06:56 +0200
committerSteffen Klassert <steffen.klassert@secunet.com>2020-04-15 09:50:03 +0200
commit3c96ec56828922e3fe5477f75eb3fc02f98f98b5 (patch)
tree1946f27bcce1ae8d24edadc021a76ede3df7ec2d
parentxfrm: do pskb_pull properly in __xfrm_transport_prep (diff)
downloadlinux-3c96ec56828922e3fe5477f75eb3fc02f98f98b5.tar.xz
linux-3c96ec56828922e3fe5477f75eb3fc02f98f98b5.zip
esp6: get the right proto for transport mode in esp6_gso_encap
For transport mode, when ipv6 nexthdr is set, the packet format might be like: ---------------------------------------------------- | | dest | | | | ESP | ESP | | IP6 hdr| opts.| ESP | TCP | Data | Trailer | ICV | ---------------------------------------------------- What it wants to get for x-proto in esp6_gso_encap() is the proto that will be set in ESP nexthdr. So it should skip all ipv6 nexthdrs and get the real transport protocol. Othersize, the wrong proto number will be set into ESP nexthdr. This patch is to skip all ipv6 nexthdrs by calling ipv6_skip_exthdr() in esp6_gso_encap(). Fixes: 7862b4058b9f ("esp: Add gso handlers for esp4 and esp6") Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
-rw-r--r--net/ipv6/esp6_offload.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/net/ipv6/esp6_offload.c b/net/ipv6/esp6_offload.c
index 8eab2c869d61..b82850886574 100644
--- a/net/ipv6/esp6_offload.c
+++ b/net/ipv6/esp6_offload.c
@@ -123,9 +123,16 @@ static void esp6_gso_encap(struct xfrm_state *x, struct sk_buff *skb)
struct ip_esp_hdr *esph;
struct ipv6hdr *iph = ipv6_hdr(skb);
struct xfrm_offload *xo = xfrm_offload(skb);
- int proto = iph->nexthdr;
+ u8 proto = iph->nexthdr;
skb_push(skb, -skb_network_offset(skb));
+
+ if (x->outer_mode.encap == XFRM_MODE_TRANSPORT) {
+ __be16 frag;
+
+ ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &proto, &frag);
+ }
+
esph = ip_esp_hdr(skb);
*skb_mac_header(skb) = IPPROTO_ESP;