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authorDavid Ahern <dsa@cumulusnetworks.com>2016-05-10 11:19:50 -0700
committerDavid S. Miller <davem@davemloft.net>2016-05-11 19:31:40 -0400
commit74b20582ac389ee9f18a6fcc0eef244658ce8de0 (patch)
tree63f32ea105bb23a61a15c91615ef5cf8895e7bd7 /net/ipv4/ip_input.c
parentipv6: fix 4in6 tunnel receive path (diff)
downloadlinux-dev-74b20582ac389ee9f18a6fcc0eef244658ce8de0.tar.xz
linux-dev-74b20582ac389ee9f18a6fcc0eef244658ce8de0.zip
net: l3mdev: Add hook in ip and ipv6
Currently the VRF driver uses the rx_handler to switch the skb device to the VRF device. Switching the dev prior to the ip / ipv6 layer means the VRF driver has to duplicate IP/IPv6 processing which adds overhead and makes features such as retaining the ingress device index more complicated than necessary. This patch moves the hook to the L3 layer just after the first NF_HOOK for PRE_ROUTING. This location makes exposing the original ingress device trivial (next patch) and allows adding other NF_HOOKs to the VRF driver in the future. dev_queue_xmit_nit is exported so that the VRF driver can cycle the skb with the switched device through the packet taps to maintain current behavior (tcpdump can be used on either the vrf device or the enslaved devices). Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
-rw-r--r--net/ipv4/ip_input.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index 751c0658e194..37375eedeef9 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -313,6 +313,13 @@ static int ip_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
const struct iphdr *iph = ip_hdr(skb);
struct rtable *rt;
+ /* if ingress device is enslaved to an L3 master device pass the
+ * skb to its handler for processing
+ */
+ skb = l3mdev_ip_rcv(skb);
+ if (!skb)
+ return NET_RX_SUCCESS;
+
if (net->ipv4.sysctl_ip_early_demux &&
!skb_dst(skb) &&
!skb->sk &&