Commit cbea8f02 authored by David Ahern's avatar David Ahern Committed by David S. Miller

net: ipv4: fix l3slave check for index returned in IP_PKTINFO

rt_iif is only set to the actual egress device for the output path. The
recent change to consider the l3slave flag when returning IP_PKTINFO
works for local traffic (the correct device index is returned), but it
broke the more typical use case of packets received from a remote host
always returning the VRF index rather than the original ingress device.
Update the fixup to consider l3slave and rt_iif actually getting set.

Fixes: 1dfa7639 ("net: ipv4: add check for l3slave for index returned in IP_PKTINFO")
Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2aa70f86
...@@ -1207,7 +1207,6 @@ static int do_ip_setsockopt(struct sock *sk, int level, ...@@ -1207,7 +1207,6 @@ static int do_ip_setsockopt(struct sock *sk, int level,
void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
{ {
struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb); struct in_pktinfo *pktinfo = PKTINFO_SKB_CB(skb);
bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags);
bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) || bool prepare = (inet_sk(sk)->cmsg_flags & IP_CMSG_PKTINFO) ||
ipv6_sk_rxinfo(sk); ipv6_sk_rxinfo(sk);
...@@ -1221,8 +1220,13 @@ void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb) ...@@ -1221,8 +1220,13 @@ void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
* (e.g., process binds socket to eth0 for Tx which is * (e.g., process binds socket to eth0 for Tx which is
* redirected to loopback in the rtable/dst). * redirected to loopback in the rtable/dst).
*/ */
if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX || l3slave) struct rtable *rt = skb_rtable(skb);
bool l3slave = ipv4_l3mdev_skb(IPCB(skb)->flags);
if (pktinfo->ipi_ifindex == LOOPBACK_IFINDEX)
pktinfo->ipi_ifindex = inet_iif(skb); pktinfo->ipi_ifindex = inet_iif(skb);
else if (l3slave && rt && rt->rt_iif)
pktinfo->ipi_ifindex = rt->rt_iif;
pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
} else { } else {
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment