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

commit 17175d1a27 ("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: 0146dca70b ("xfrm: add support for UDPv6 encapsulation of ESP")
Fixes: 26333c37fc ("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>
This commit is contained in:
Sabrina Dubroca 2020-07-27 16:03:47 +02:00 committed by Steffen Klassert
parent 37bd22420f
commit d5dba1376e
1 changed files with 1 additions and 0 deletions
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net/ipv6/esp6.c
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@ -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: