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netfilter: Pass socket pointer down through okfn().

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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>
This commit is contained in:
David Miller
2015-04-05 22:19:04 -04:00
committed by David S. Miller
parent 1c984f8a5d
commit 7026b1ddb6
39 changed files with 277 additions and 218 deletions
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6
include/net/dn_neigh.h
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@@ -18,11 +18,11 @@ struct dn_neigh {
void dn_neigh_init(void);
void dn_neigh_cleanup(void);
int dn_neigh_router_hello(struct sk_buff *skb);
int dn_neigh_endnode_hello(struct sk_buff *skb);
int dn_neigh_router_hello(struct sock *sk, struct sk_buff *skb);
int dn_neigh_endnode_hello(struct sock *sk, struct sk_buff *skb);
void dn_neigh_pointopoint_hello(struct sk_buff *skb);
int dn_neigh_elist(struct net_device *dev, unsigned char *ptr, int n);
int dn_to_neigh_output(struct sk_buff *skb);
int dn_to_neigh_output(struct sock *sk, struct sk_buff *skb);
extern struct neigh_table dn_neigh_table;