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-rw-r--r--net/ipv4/ip_sockglue.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 57e1405e8282..53ae0c6315ad 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -1225,8 +1225,14 @@ void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
* which has interface index (iif) as the first member of the
* underlying inet{6}_skb_parm struct. This code then overlays
* PKTINFO_SKB_CB and in_pktinfo also has iif as the first
- * element so the iif is picked up from the prior IPCB
+ * element so the iif is picked up from the prior IPCB. If iif
+ * is the loopback interface, then return the sending interface
+ * (e.g., process binds socket to eth0 for Tx which is
+ * redirected to loopback in the rtable/dst).
*/
+ if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX)
+ pktinfo->ipi_ifindex = inet_iif(skb);
+
pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
} else {
pktinfo->ipi_ifindex = 0;