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net: Fix vti use case with oif in dst lookups

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Steffen reported that the recent change to add oif to dst lookups breaks
the VTI use case. The problem is that with the oif set in the flow struct
the comparison to the nh_oif is triggered. Fix by splitting the
FLOWI_FLAG_VRFSRC into 2 flags -- one that triggers the vrf device cache
bypass (FLOWI_FLAG_VRFSRC) and another telling the lookup to not compare
nh oif (FLOWI_FLAG_SKIP_NH_OIF).

Fixes: 42a7b32b73 ("xfrm: Add oif to dst lookups")

Signed-off-by: David Ahern <[email protected]>
Acked-by: Steffen Klassert <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
David Ahern 2015-09-15 15:10:50 -07:00 • committed by David S. Miller
commit 58189ca7b2
6 changed files with 9 additions and 4 deletions
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2
net/ipv4/fib_trie.c
View file

@ -1426,7 +1426,7 @@ found:
nh->nh_flags & RTNH_F_LINKDOWN &&
!(fib_flags & FIB_LOOKUP_IGNORE_LINKSTATE))
continue;
if (!(flp->flowi4_flags & FLOWI_FLAG_VRFSRC)) {
if (!(flp->flowi4_flags & FLOWI_FLAG_SKIP_NH_OIF)) {
if (flp->flowi4_oif &&
flp->flowi4_oif != nh->nh_oif)
continue;

3
net/ipv4/udp.c
View file

@ -1024,7 +1024,8 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
if (netif_index_is_vrf(net, ipc.oif)) {
flowi4_init_output(fl4, ipc.oif, sk->sk_mark, tos,
RT_SCOPE_UNIVERSE, sk->sk_protocol,
(flow_flags | FLOWI_FLAG_VRFSRC),
(flow_flags | FLOWI_FLAG_VRFSRC |
FLOWI_FLAG_SKIP_NH_OIF),
faddr, saddr, dport,
inet->inet_sport);

2
net/ipv4/xfrm4_policy.c
View file

@ -33,6 +33,8 @@ static struct dst_entry *__xfrm4_dst_lookup(struct net *net, struct flowi4 *fl4,
if (saddr)
fl4->saddr = saddr->a4;
fl4->flowi4_flags = FLOWI_FLAG_SKIP_NH_OIF;
rt = __ip_route_output_key(net, fl4);
if (!IS_ERR(rt))
return &rt->dst;