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/ipmr.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'net/ipv4/ipmr.c') diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c index 5f17d0e78071..3a2c0162c3ba 100644 --- a/net/ipv4/ipmr.c +++ b/net/ipv4/ipmr.c @@ -1679,7 +1679,7 @@ static void ip_encap(struct net *net, struct sk_buff *skb, nf_reset(skb); } -static inline int ipmr_forward_finish(struct sk_buff *skb) +static inline int ipmr_forward_finish(struct sock *sk, struct sk_buff *skb) { struct ip_options *opt = &(IPCB(skb)->opt); @@ -1689,7 +1689,7 @@ static inline int ipmr_forward_finish(struct sk_buff *skb) if (unlikely(opt->optlen)) ip_forward_options(skb); - return dst_output(skb); + return dst_output_sk(sk, skb); } /* @@ -1788,7 +1788,8 @@ static void ipmr_queue_xmit(struct net *net, struct mr_table *mrt, * not mrouter) cannot join to more than one interface - it will * result in receiving multiple packets. */ - NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD, skb, skb->dev, dev, + NF_HOOK(NFPROTO_IPV4, NF_INET_FORWARD, NULL, skb, + skb->dev, dev, ipmr_forward_finish); return; -- cgit v1.2.3