diff options
| author | David Ahern <dsa@cumulusnetworks.com> | 2016-05-10 11:19:50 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-05-11 19:31:40 -0400 |
| commit | 74b20582ac389ee9f18a6fcc0eef244658ce8de0 (patch) | |
| tree | 63f32ea105bb23a61a15c91615ef5cf8895e7bd7 /net | |
| parent | ca4aa976f04d14bc7da60dce0e2afc34c9f0f1d2 (diff) | |
| download | linux-74b20582ac389ee9f18a6fcc0eef244658ce8de0.tar.bz2 | |
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 'net')
| -rw-r--r-- | net/core/dev.c | 3 | ||||
| -rw-r--r-- | net/ipv4/ip_input.c | 7 | ||||
| -rw-r--r-- | net/ipv6/ip6_input.c | 7 |
3 files changed, 16 insertions, 1 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index c7490339315c..12436d1312ca 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1850,7 +1850,7 @@ static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb) * taps currently in use. */ -static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) +void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) { struct packet_type *ptype; struct sk_buff *skb2 = NULL; @@ -1907,6 +1907,7 @@ out_unlock: pt_prev->func(skb2, skb->dev, pt_prev, skb->dev); rcu_read_unlock(); } +EXPORT_SYMBOL_GPL(dev_queue_xmit_nit); /** * netif_setup_tc - Handle tc mappings on real_num_tx_queues change 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 && diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c index 6ed56012005d..f185cbcda114 100644 --- a/net/ipv6/ip6_input.c +++ b/net/ipv6/ip6_input.c @@ -49,6 +49,13 @@ int ip6_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb) { + /* if ingress device is enslaved to an L3 master device pass the + * skb to its handler for processing + */ + skb = l3mdev_ip6_rcv(skb); + if (!skb) + return NET_RX_SUCCESS; + if (net->ipv4.sysctl_ip_early_demux && !skb_dst(skb) && skb->sk == NULL) { const struct inet6_protocol *ipprot; |