diff options
| author |   Guillaume Nault <gnault@redhat.com> | 2022-01-10 14:43:09 +0100 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2022-01-11 20:36:08 -0800 |
| commit | f7716b318568b22fbf0e3be99279a979e217cf71 (patch) | |
| tree | 0b96d0fa492edf379cb8eb633d95b36bc1bd7a63 | |
| parent | xfrm: Don't accidentally set RTO_ONLINK in decode_session4() (diff) | |
| download | linux-dev-f7716b318568b22fbf0e3be99279a979e217cf71.tar.xz linux-dev-f7716b318568b22fbf0e3be99279a979e217cf71.zip | |
gre: Don't accidentally set RTO_ONLINK in gre_fill_metadata_dst()
Mask the ECN bits before initialising ->flowi4_tos. The tunnel key may
have the last ECN bit set, which will interfere with the route lookup
process as ip_route_output_key_hash() interpretes this bit specially
(to restrict the route scope).
Found by code inspection, compile tested only.
Fixes: 962924fa2b7a ("ip_gre: Refactor collect metatdata mode tunnel xmit to ip_md_tunnel_xmit")
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| -rw-r--r-- | net/ipv4/ip_gre.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index 2ac2b95c5694..99db2e41ed10 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -604,8 +604,9 @@ static int gre_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) key = &info->key; ip_tunnel_init_flow(&fl4, IPPROTO_GRE, key->u.ipv4.dst, key->u.ipv4.src, - tunnel_id_to_key32(key->tun_id), key->tos, 0, - skb->mark, skb_get_hash(skb)); + tunnel_id_to_key32(key->tun_id), + key->tos & ~INET_ECN_MASK, 0, skb->mark, + skb_get_hash(skb)); rt = ip_route_output_key(dev_net(dev), &fl4); if (IS_ERR(rt)) return PTR_ERR(rt); |