From 7026b1ddb6b8d4e6ee33dc2bd06c0ca8746fa7ab Mon Sep 17 00:00:00 2001 From: David Miller Date: Sun, 5 Apr 2015 22:19:04 -0400 Subject: netfilter: Pass socket pointer down through okfn(). On the output paths in particular, we have to sometimes deal with two socket contexts. First, and usually skb->sk, is the local socket that generated the frame. And second, is potentially the socket used to control a tunneling socket, such as one the encapsulates using UDP. We do not want to disassociate skb->sk when encapsulating in order to fix this, because that would break socket memory accounting. The most extreme case where this can cause huge problems is an AF_PACKET socket transmitting over a vxlan device. We hit code paths doing checks that assume they are dealing with an ipv4 socket, but are actually operating upon the AF_PACKET one. Signed-off-by: David S. Miller --- net/ipv4/arp.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'net/ipv4/arp.c') diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c index c6e67aa46c32..933a92820d26 100644 --- a/net/ipv4/arp.c +++ b/net/ipv4/arp.c @@ -591,7 +591,8 @@ EXPORT_SYMBOL(arp_create); void arp_xmit(struct sk_buff *skb) { /* Send it off, maybe filter it using firewalling first. */ - NF_HOOK(NFPROTO_ARP, NF_ARP_OUT, skb, NULL, skb->dev, dev_queue_xmit); + NF_HOOK(NFPROTO_ARP, NF_ARP_OUT, NULL, skb, + NULL, skb->dev, dev_queue_xmit_sk); } EXPORT_SYMBOL(arp_xmit); @@ -625,7 +626,7 @@ EXPORT_SYMBOL(arp_send); * Process an arp request. */ -static int arp_process(struct sk_buff *skb) +static int arp_process(struct sock *sk, struct sk_buff *skb) { struct net_device *dev = skb->dev; struct in_device *in_dev = __in_dev_get_rcu(dev); @@ -846,7 +847,7 @@ out: static void parp_redo(struct sk_buff *skb) { - arp_process(skb); + arp_process(NULL, skb); } @@ -879,7 +880,8 @@ 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, skb, dev, NULL, arp_process); + return NF_HOOK(NFPROTO_ARP, NF_ARP_IN, NULL, skb, + dev, NULL, arp_process); consumeskb: consume_skb(skb); -- cgit v1.2.3