On 4/2/17 10:57 PM, Jack Ma wrote: > diff --git a/net/ipv4/netfilter.c b/net/ipv4/netfilter.c > index c0cc6aa..07168d4 100644 > --- a/net/ipv4/netfilter.c > +++ b/net/ipv4/netfilter.c > @@ -46,6 +46,14 @@ int ip_route_me_harder(struct net *net, struct sk_buff > *skb, unsigned int addr_t > fl4.flowi4_oif = l3mdev_master_ifindex(dev);
How does the above line (which is part of this block: fl4.flowi4_oif = sk ? sk->sk_bound_dev_if : 0; if (!fl4.flowi4_oif) fl4.flowi4_oif = l3mdev_master_ifindex(dev); ) not work? The dst should be set on the skb at this point and the device would reference the VRF. > fl4.flowi4_mark = skb->mark; > fl4.flowi4_flags = flags; > + > + /* Since we have already known this is vrf flow passed by > + * mangle table, we wrap the oif with the master interface. > + */ > + if (fl4.flowi4_oif == 0 && fl4.daddr && skb->dev && > + netif_index_is_l3_master(net, skb->dev->ifindex)) > + fl4.flowi4_oif = skb->dev->ifindex; > + > rt = ip_route_output_key(net, &fl4); > if (IS_ERR(rt)) > return PTR_ERR(rt); >