xfrm: Only add l3mdev oif to dst lookups

Subash reported that commit 42a7b32b73d6 ("xfrm: Add oif to dst lookups")
broke a wifi use case that uses fib rules and xfrms. The intent of
42a7b32b73d6 was driven by VRFs with IPsec. As a compromise relax the
use of oif in xfrm lookups to L3 master devices only (ie., oif is either
an L3 master device or is enslaved to a master device).

Fixes: 42a7b32b73d6 ("xfrm: Add oif to dst lookups")
Reported-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c
index 7b0edb37a1150427ef3b0d9a7f2be11421ef67b0..e07ed8b1deb39e0ee6f75b4db25763b3a91a40e2 100644 (file)
--- a/net/ipv4/xfrm4_policy.c
+++ b/net/ipv4/xfrm4_policy.c
@@ -29,7 +29,7 @@ static struct dst_entry *__xfrm4_dst_lookup(struct net *net, struct flowi4 *fl4,
        memset(fl4, 0, sizeof(*fl4));
        fl4->daddr = daddr->a4;
        fl4->flowi4_tos = tos;
-       fl4->flowi4_oif = oif;
+       fl4->flowi4_oif = l3mdev_master_ifindex_by_index(net, oif);
        if (saddr)
                fl4->saddr = saddr->a4;
 

diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index c074771a10f761253f99611de8294172bdb0e142..dd84ecd1221bfa6fe409074e5eb1d15c43301c66 100644 (file)
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -36,7 +36,7 @@ static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos, int oif,
        int err;
 
        memset(&fl6, 0, sizeof(fl6));
-       fl6.flowi6_oif = oif;
+       fl6.flowi6_oif = l3mdev_master_ifindex_by_index(net, oif);
        fl6.flowi6_flags = FLOWI_FLAG_SKIP_NH_OIF;
        memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr));
        if (saddr)