diff options
Diffstat (limited to 'net/ipv4/ip_output.c')
| -rw-r--r-- | net/ipv4/ip_output.c | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index cdd6c3418b9e..cc7ef0d05bbd 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -327,18 +327,35 @@ 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) { - int ret; + struct rtable *new_rt; + bool do_cn = false; + int ret, err; ret = BPF_CGROUP_RUN_PROG_INET_EGRESS(sk, skb); switch (ret) { - case NET_XMIT_SUCCESS: - return dev_loopback_xmit(net, sk, skb); case NET_XMIT_CN: - return dev_loopback_xmit(net, sk, skb) ? : ret; + do_cn = true; + /* fall through */ + case NET_XMIT_SUCCESS: + break; default: kfree_skb(skb); 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); + } + + err = dev_loopback_xmit(net, sk, skb); + return (do_cn && err) ? ret : err; } int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb) |