diff options
| author | Eric W. Biederman <ebiederm@xmission.com> | 2015-09-16 04:04:16 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-09-18 03:18:37 +0300 |
| commit | 29a26a56803855a79dbd028cd61abee56237d6e5 (patch) | |
| tree | 89fb3a95216d44417577e218a967ede09d676922 /net/ipv4/arp.c | |
| parent | 04eb44890e5bb3cc855e5c0f18a05eb7311364b7 (diff) | |
| download | linux-29a26a56803855a79dbd028cd61abee56237d6e5.tar.xz | |
netfilter: Pass struct net into the netfilter hooks
Pass a network namespace parameter into the netfilter hooks. At the
call site of the netfilter hooks the path a packet is taking through
the network stack is well known which allows the network namespace to
be easily and reliabily.
This allows the replacement of magic code like
"dev_net(state->in?:state->out)" that appears at the start of most
netfilter hooks with "state->net".
In almost all cases the network namespace passed in is derived
from the first network device passed in, guaranteeing those
paths will not see any changes in practice.
The exceptions are:
xfrm/xfrm_output.c:xfrm_output_resume() xs_net(skb_dst(skb)->xfrm)
ipvs/ip_vs_xmit.c:ip_vs_nat_send_or_cont() ip_vs_conn_net(cp)
ipvs/ip_vs_xmit.c:ip_vs_send_or_cont() ip_vs_conn_net(cp)
ipv4/raw.c:raw_send_hdrinc() sock_net(sk)
ipv6/ip6_output.c:ip6_xmit() sock_net(sk)
ipv6/ndisc.c:ndisc_send_skb() dev_net(skb->dev) not dev_net(dst->dev)
ipv6/raw.c:raw6_send_hdrinc() sock_net(sk)
br_netfilter_hooks.c:br_nf_pre_routing_finish() dev_net(skb->dev) before skb->dev is set to nf_bridge->physindev
In all cases these exceptions seem to be a better expression for the
network namespace the packet is being processed in then the historic
"dev_net(in?in:out)". I am documenting them in case something odd
pops up and someone starts trying to track down what happened.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/arp.c')
| -rw-r--r-- | net/ipv4/arp.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c index 3632e98eb0f9..ae71e9ade5f9 100644 --- a/net/ipv4/arp.c +++ b/net/ipv4/arp.c @@ -632,8 +632,9 @@ static int arp_xmit_finish(struct sock *sk, struct sk_buff *skb) void arp_xmit(struct sk_buff *skb) { /* Send it off, maybe filter it using firewalling first. */ - NF_HOOK(NFPROTO_ARP, NF_ARP_OUT, NULL, skb, - NULL, skb->dev, arp_xmit_finish); + NF_HOOK(NFPROTO_ARP, NF_ARP_OUT, + dev_net(skb->dev), NULL, skb, NULL, skb->dev, + arp_xmit_finish); } EXPORT_SYMBOL(arp_xmit); @@ -897,8 +898,9 @@ static int arp_rcv(struct sk_buff *skb, struct net_device *dev, memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); - return NF_HOOK(NFPROTO_ARP, NF_ARP_IN, NULL, skb, - dev, NULL, arp_process); + return NF_HOOK(NFPROTO_ARP, NF_ARP_IN, + dev_net(dev), NULL, skb, dev, NULL, + arp_process); consumeskb: consume_skb(skb); |