From: Mike Yu yumike@google.com
[ Upstream commit d4872d70fc6feabfc8e897edad993a81096ade9f ]
In current code, xfrm_bundle_create() always uses the matched SA's family type to look up a xfrm child route for the skb. The route returned by xfrm_dst_lookup() will eventually be used in xfrm_output_resume() (skb_dst(skb)->ops->local_out()).
If packet offload is used, the above behavior can lead to calling ip_local_out() for an IPv6 packet or calling ip6_local_out() for an IPv4 packet, which is likely to fail.
This change fixes the behavior by checking if the matched SA has packet offload enabled. If not, keep the same behavior; if yes, use the matched SP's family type for the lookup.
Test: verified IPv6-in-IPv4 packets on Android device with IPsec packet offload enabled Signed-off-by: Mike Yu yumike@google.com Signed-off-by: Steffen Klassert steffen.klassert@secunet.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/xfrm/xfrm_policy.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index c13dc3ef79107..3c666dee04fcf 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -2694,7 +2694,9 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, if (xfrm[i]->props.smark.v || xfrm[i]->props.smark.m) mark = xfrm_smark_get(fl->flowi_mark, xfrm[i]);
- family = xfrm[i]->props.family; + if (xfrm[i]->xso.type != XFRM_DEV_OFFLOAD_PACKET) + family = xfrm[i]->props.family; + oif = fl->flowi_oif ? : fl->flowi_l3mdev; dst = xfrm_dst_lookup(xfrm[i], tos, oif, &saddr, &daddr, family, mark);