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| author | David Ahern <dsahern@gmail.com> | 2017-09-13 17:11:37 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-09-15 14:27:51 -0700 |
| commit | cbea8f02069533ea2ad4e5b3bfbcdb0894c20354 (patch) | |
| tree | 76214a42f705f5c745b735046942b6e672fdbcf8 | |
| parent | 2aa70f864955bf02362e3fb3008e4208d7a17a98 (diff) | |
| download | linux-stable-cbea8f02069533ea2ad4e5b3bfbcdb0894c20354.tar.gz linux-stable-cbea8f02069533ea2ad4e5b3bfbcdb0894c20354.tar.bz2 linux-stable-cbea8f02069533ea2ad4e5b3bfbcdb0894c20354.zip | |
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: 1dfa76390bf05 ("net: ipv4: add check for l3slave for index returned in IP_PKTINFO")
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/ip_sockglue.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index e558e4f9597b..a599aa83fdad 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -1207,7 +1207,6 @@ e_inval: void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *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) || ipv6_sk_rxinfo(sk); @@ -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 * 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); + else if (l3slave && rt && rt->rt_iif) + pktinfo->ipi_ifindex = rt->rt_iif; pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb); } else { |