From 3c96ec56828922e3fe5477f75eb3fc02f98f98b5 Mon Sep 17 00:00:00 2001 From: Xin Long Date: Fri, 10 Apr 2020 17:06:56 +0800 Subject: [PATCH] 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 Signed-off-by: Steffen Klassert --- net/ipv6/esp6_offload.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) 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;