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 move the packet intercept from an rx handler that is invoked by __netif_receive_skb_core to the ipv4 and ipv6 receive processing.
IPv6 already saves the skb_iif to the control buffer in ipv6_rcv. Since the skb->dev has not been switched the cb has the enslaved device. Make the same happen for IPv4 by adding 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. David Ahern (2): net: l3mdev: Add hook in ip and ipv6 net: original ingress device index in PKTINFO drivers/net/vrf.c | 189 ++++++++++++++++++++++------------------------ include/linux/ipv6.h | 17 ++++- include/linux/netdevice.h | 2 + include/net/ip.h | 1 + include/net/l3mdev.h | 42 +++++++++++ include/net/tcp.h | 4 +- net/core/dev.c | 3 +- net/ipv4/ip_input.c | 8 ++ net/ipv4/ip_sockglue.c | 7 +- net/ipv6/ip6_input.c | 7 ++ 10 files changed, 178 insertions(+), 102 deletions(-) -- 2.1.4
