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| author | David Miller <davem@davemloft.net> | 2015-04-06 05:19:04 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-04-07 22:25:55 +0300 |
| commit | 7026b1ddb6b8d4e6ee33dc2bd06c0ca8746fa7ab (patch) | |
| tree | 3e11ed0f186ea6066a3f7efecb88d85bc732ee51 /net/ipv4/xfrm4_output.c | |
| parent | 1c984f8a5df085bcf35364a8a870bd4db4da4ed3 (diff) | |
| download | linux-7026b1ddb6b8d4e6ee33dc2bd06c0ca8746fa7ab.tar.xz | |
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 <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/xfrm4_output.c')
| -rw-r--r-- | net/ipv4/xfrm4_output.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c index dab73813cb92..2878dbfffeb7 100644 --- a/net/ipv4/xfrm4_output.c +++ b/net/ipv4/xfrm4_output.c @@ -69,7 +69,7 @@ int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb) } EXPORT_SYMBOL(xfrm4_prepare_output); -int xfrm4_output_finish(struct sk_buff *skb) +int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb) { memset(IPCB(skb), 0, sizeof(*IPCB(skb))); @@ -77,26 +77,26 @@ int xfrm4_output_finish(struct sk_buff *skb) IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED; #endif - return xfrm_output(skb); + return xfrm_output(sk, skb); } -static int __xfrm4_output(struct sk_buff *skb) +static int __xfrm4_output(struct sock *sk, struct sk_buff *skb) { struct xfrm_state *x = skb_dst(skb)->xfrm; #ifdef CONFIG_NETFILTER if (!x) { IPCB(skb)->flags |= IPSKB_REROUTED; - return dst_output(skb); + return dst_output_sk(sk, skb); } #endif - return x->outer_mode->afinfo->output_finish(skb); + return x->outer_mode->afinfo->output_finish(sk, skb); } int xfrm4_output(struct sock *sk, struct sk_buff *skb) { - return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, skb, + return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, sk, skb, NULL, skb_dst(skb)->dev, __xfrm4_output, !(IPCB(skb)->flags & IPSKB_REROUTED)); } |