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authorDavid Ahern <dsa@cumulusnetworks.com>2016-05-10 11:19:51 -0700
committerDavid S. Miller <davem@davemloft.net>2016-05-11 19:31:40 -0400
commit0b922b7a829c06e3b0790c58cd9ca026de86096e (patch)
treeb68c8a9b5148687c7bce7c6a5ab14e26a5c47050 /net/ipv4
parent74b20582ac389ee9f18a6fcc0eef244658ce8de0 (diff)
downloadlinux-0b922b7a829c06e3b0790c58cd9ca026de86096e.tar.bz2
net: original ingress device index in PKTINFO
Applications such as OSPF and BFD need the original ingress device not the VRF device; the latter can be derived from the former. To that end add the skb_iif to inet_skb_parm and set it in ipv4 code after clearing the skb control buffer similar to IPv6. From there the pktinfo can just pull it from cb with the PKTINFO_SKB_CB cast. The previous patch moving the skb->dev change to L3 means nothing else is needed for IPv6; it just works. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/ip_input.c1
-rw-r--r--net/ipv4/ip_sockglue.c7
2 files changed, 7 insertions, 1 deletions
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index 37375eedeef9..4b351af3e67b 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -478,6 +478,7 @@ int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
/* Remove any debris in the socket control block */
memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
+ IPCB(skb)->iif = skb->skb_iif;
/* Must drop socket now because of tproxy. */
skb_orphan(skb);
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index bdb222c0c6a2..5805762d7fc7 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -1193,7 +1193,12 @@ void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb)
ipv6_sk_rxinfo(sk);
if (prepare && skb_rtable(skb)) {
- pktinfo->ipi_ifindex = inet_iif(skb);
+ /* skb->cb is overloaded: prior to this point it is IP{6}CB
+ * 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
+ */
pktinfo->ipi_spec_dst.s_addr = fib_compute_spec_dst(skb);
} else {
pktinfo->ipi_ifindex = 0;