core/dev: do not ignore dmac in dev_forward_skb()

[ Upstream commit 81b9eab5ebbf0d5d54da4fc168cfb02c2adc76b8 ]

commit 06a23fe31ca3
("core/dev: set pkt_type after eth_type_trans() in dev_forward_skb()")
and refactoring 64261f230a91
("dev: move skb_scrub_packet() after eth_type_trans()")

are forcing pkt_type to be PACKET_HOST when skb traverses veth.

which means that ip forwarding will kick in inside netns
even if skb->eth->h_dest != dev->dev_addr

Fix order of eth_type_trans() and skb_scrub_packet() in dev_forward_skb()
and in ip_tunnel_rcv()

Fixes: 06a23fe31ca3 ("core/dev: set pkt_type after eth_type_trans() in dev_forward_skb()")
CC: Isaku Yamahata <yamahatanetdev@gmail.com>
CC: Maciej Zenczykowski <zenczykowski@gmail.com>
CC: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/core/dev.c b/net/core/dev.c
index 3430b1ed12e5f93b14ca1f377f848fa29a81be00..2afc5211dc211eef6dfb4feda34900afdc1f0f7d 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1691,13 +1691,9 @@ int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
                kfree_skb(skb);
                return NET_RX_DROP;
        }
-       skb->protocol = eth_type_trans(skb, dev);
 
-       /* eth_type_trans() can set pkt_type.
-        * call skb_scrub_packet() after it to clear pkt_type _after_ calling
-        * eth_type_trans().
-        */
        skb_scrub_packet(skb, true);
+       skb->protocol = eth_type_trans(skb, dev);
 
        return netif_rx(skb);
 }

diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 63a6d6d6b87581d3ac3bda52cab5833f3cb169ab..254f11c24aa5eee54db62d065b7d01b2d19ff6ff 100644 (file)
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -454,6 +454,8 @@ int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
        tstats->rx_bytes += skb->len;
        u64_stats_update_end(&tstats->syncp);
 
+       skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
+
        if (tunnel->dev->type == ARPHRD_ETHER) {
                skb->protocol = eth_type_trans(skb, tunnel->dev);
                skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
@@ -461,8 +463,6 @@ int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
                skb->dev = tunnel->dev;
        }
 
-       skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
-
        gro_cells_receive(&tunnel->gro_cells, skb);
        return 0;