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esp4: prepare esp_input_done2 for non-UDP encapsulation 

For espintcp encapsulation, we will need to get the source port from the
TCP header instead of UDP. Introduce a variable to hold the port.

Co-developed-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Sabrina Dubroca 2019-11-25 14:49:00 +01:00 committed by Steffen Klassert
parent cac3c71604
commit 25f6802b4c
1 changed files with 14 additions and 2 deletions
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16
net/ipv4/esp4.c
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@ -601,6 +601,18 @@ int esp_input_done2(struct sk_buff *skb, int err)
if (x->encap) {
struct xfrm_encap_tmpl *encap = x->encap;
struct udphdr *uh = (void *)(skb_network_header(skb) + ihl);
__be16 source;
switch (x->encap->encap_type) {
case UDP_ENCAP_ESPINUDP:
case UDP_ENCAP_ESPINUDP_NON_IKE:
source = uh->source;
break;
default:
WARN_ON_ONCE(1);
err = -EINVAL;
goto out;
}
/*
* 1) if the NAT-T peer's IP or port changed then
@ -609,11 +621,11 @@ int esp_input_done2(struct sk_buff *skb, int err)
* SRC ports.
*/
if (iph->saddr != x->props.saddr.a4 ||
uh->source != encap->encap_sport) {
source != encap->encap_sport) {
xfrm_address_t ipaddr;
ipaddr.a4 = iph->saddr;
km_new_mapping(x, &ipaddr, uh->source);
km_new_mapping(x, &ipaddr, source);
/* XXX: perhaps add an extra
* policy check here, to see