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ipv4: reset rt_iif for recirculated mcast/bcast out pkts

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Multicast or broadcast egress packets have rt_iif set to the oif. These
packets might be recirculated back as input and lookup to the raw
sockets may fail because they are bound to the incoming interface
(skb_iif). If rt_iif is not zero, during the lookup, inet_iif() function
returns rt_iif instead of skb_iif. Hence, the lookup fails.

v2: Make it non vrf specific (David Ahern). Reword the changelog to
    reflect it.
Signed-off-by: Stephen Suryaputra <ssuryaextr@gmail.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Suryaputra 2019-06-26 02:21:16 -04:00 • committed by David S. Miller
parent ee4297420d
commit 5b18f12898
3 changed files with 46 additions and 0 deletions
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12
net/ipv4/ip_output.c
View file

@ -318,6 +318,7 @@ static int ip_finish_output(struct net *net, struct sock *sk, struct sk_buff *sk
static int ip_mc_finish_output(struct net *net, struct sock *sk,
struct sk_buff *skb)
{
struct rtable *new_rt;
int ret;
ret = BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb);
@ -326,6 +327,17 @@ static int ip_mc_finish_output(struct net *net, struct sock *sk,
return ret;
}
/* Reset rt_iif so that inet_iif() will return skb->skb_iif. Setting
* this to non-zero causes ipi_ifindex in in_pktinfo to be overwritten,
* see ipv4_pktinfo_prepare().
*/
new_rt = rt_dst_clone(net->loopback_dev, skb_rtable(skb));
if (new_rt) {
new_rt->rt_iif = 0;
skb_dst_drop(skb);
skb_dst_set(skb, &new_rt->dst);
}
return dev_loopback_xmit(net, sk, skb);
}