xfrm: esp6: fix the location of the transport header with encapsulation

commit 17175d1a ("xfrm: esp6: fix encapsulation header offset
computation") changed esp6_input_done2 to correctly find the size of
the IPv6 header that precedes the TCP/UDP encapsulation header, but
didn't adjust the final call to skb_set_transport_header, which I
assumed was correct in using skb_network_header_len.

Xiumei Mu reported that when we create xfrm states that include port
numbers in the selector, traffic from the user sockets is dropped. It
turns out that we get a state mismatch in __xfrm_policy_check, because
we end up trying to compare the encapsulation header's ports with the
selector that's based on user traffic ports.

Fixes: 0146dca7 ("xfrm: add support for UDPv6 encapsulation of ESP")
Fixes: 26333c37 ("xfrm: add IPv6 support for espintcp")
Reported-by: Xiumei Mu <xmu@redhat.com>
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

net/ipv6/esp6.c

@@ -815,6 +815,7 @@ int esp6_input_done2(struct sk_buff *skb, int err)
 		offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
 		uh = (void *)(skb->data + offset);
 		th = (void *)(skb->data + offset);
+		hdr_len += offset;
 
 		switch (x->encap->encap_type) {
 		case TCP_ENCAP_ESPINTCP: