net: Handle l3mdev in ip_tunnel_init_flow

Ido reported that the commit referenced in the Fixes tag broke
a gre use case with dummy devices. Add a check to ip_tunnel_init_flow
to see if the oif is an l3mdev port and if so set the oif to 0 to
avoid the oif comparison in fib_lookup_good_nhc.

Fixes: 67bf7ede1f3e ("net: Add l3mdev index to flow struct and avoid oif reset for port devices")
Reported-by: Ido Schimmel <idosch@idosch.org>
Signed-off-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
index b73466470f75b15810b8f538ed4b79c818f2a3db..fe663b0ab7086a807f752ecbf98eb7b19bada5b6 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
@@ -423,7 +423,7 @@ mlxsw_sp_span_gretap4_route(const struct net_device *to_dev,
 
        parms = mlxsw_sp_ipip_netdev_parms4(to_dev);
        ip_tunnel_init_flow(&fl4, parms.iph.protocol, *daddrp, *saddrp,
-                           0, 0, parms.link, tun->fwmark, 0);
+                           0, 0, dev_net(to_dev), parms.link, tun->fwmark, 0);
 
        rt = ip_route_output_key(tun->net, &fl4);
        if (IS_ERR(rt))

diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
index 0219fe907b261952ec1f140d105cd74d7eda6b40..88dee57eac8a7ef991db649116d35f48a24aa225 100644 (file)
--- a/include/net/ip_tunnels.h
+++ b/include/net/ip_tunnels.h
@@ -243,11 +243,18 @@ static inline __be32 tunnel_id_to_key32(__be64 tun_id)
 static inline void ip_tunnel_init_flow(struct flowi4 *fl4,
                                       int proto,
                                       __be32 daddr, __be32 saddr,
-                                      __be32 key, __u8 tos, int oif,
+                                      __be32 key, __u8 tos,
+                                      struct net *net, int oif,
                                       __u32 mark, __u32 tun_inner_hash)
 {
        memset(fl4, 0, sizeof(*fl4));
-       fl4->flowi4_oif = oif;
+
+       if (oif) {
+               fl4->flowi4_l3mdev = l3mdev_master_upper_ifindex_by_index_rcu(net, oif);
+               /* Legacy VRF/l3mdev use case */
+               fl4->flowi4_oif = fl4->flowi4_l3mdev ? 0 : oif;
+       }
+
        fl4->daddr = daddr;
        fl4->saddr = saddr;
        fl4->flowi4_tos = tos;

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 99db2e41ed10f1fd6472b16278307ee97eee0c57..365caebf51ab50dbb8c923f9f40223be75ce52a0 100644 (file)
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -605,8 +605,8 @@ 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 & ~INET_ECN_MASK, 0, skb->mark,
-                           skb_get_hash(skb));
+                           key->tos & ~INET_ECN_MASK, dev_net(dev), 0,
+                           skb->mark, skb_get_hash(skb));
        rt = ip_route_output_key(dev_net(dev), &fl4);
        if (IS_ERR(rt))
                return PTR_ERR(rt);

diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 5a473319d3a5c8924d1101f95ea83244f5dbb833..94017a8c39945612443ba32a936f4e85eb6533ad 100644 (file)
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -294,8 +294,8 @@ static int ip_tunnel_bind_dev(struct net_device *dev)
 
                ip_tunnel_init_flow(&fl4, iph->protocol, iph->daddr,
                                    iph->saddr, tunnel->parms.o_key,
-                                   RT_TOS(iph->tos), tunnel->parms.link,
-                                   tunnel->fwmark, 0);
+                                   RT_TOS(iph->tos), dev_net(dev),
+                                   tunnel->parms.link, tunnel->fwmark, 0);
                rt = ip_route_output_key(tunnel->net, &fl4);
 
                if (!IS_ERR(rt)) {
@@ -570,7 +570,7 @@ void ip_md_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
        }
        ip_tunnel_init_flow(&fl4, proto, key->u.ipv4.dst, key->u.ipv4.src,
                            tunnel_id_to_key32(key->tun_id), RT_TOS(tos),
-                           0, skb->mark, skb_get_hash(skb));
+                           dev_net(dev), 0, skb->mark, skb_get_hash(skb));
        if (tunnel->encap.type != TUNNEL_ENCAP_NONE)
                goto tx_error;
 
@@ -726,7 +726,8 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
        }
 
        ip_tunnel_init_flow(&fl4, protocol, dst, tnl_params->saddr,
-                           tunnel->parms.o_key, RT_TOS(tos), tunnel->parms.link,
+                           tunnel->parms.o_key, RT_TOS(tos),
+                           dev_net(dev), tunnel->parms.link,
                            tunnel->fwmark, skb_get_hash(skb));
 
        if (ip_tunnel_encap(skb, tunnel, &protocol, &fl4) < 0)