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net: Move rx skb_orphan call to where needed

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In order to get the tun driver to account packets, we need to be
able to receive packets with destructors set.  To be on the safe
side, I added an skb_orphan call for all protocols by default since
some of them (IP in particular) cannot handle receiving packets
destructors properly.

Now it seems that at least one protocol (CAN) expects to be able
to pass skb->sk through the rx path without getting clobbered.

So this patch attempts to fix this properly by moving the skb_orphan
call to where it's actually needed.  In particular, I've added it
to skb_set_owner_[rw] which is what most users of skb->destructor
call.

This is actually an improvement for tun too since it means that
we only give back the amount charged to the socket when the skb
is passed to another socket that will also be charged accordingly.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Tested-by: Oliver Hartkopp <olver@hartkopp.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2009-06-22 02:25:25 +00:00 committed by David S. Miller
parent d5fdd6babc
commit d55d87fdff
6 changed files with 5 additions and 7 deletions
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1
include/net/sctp/sctp.h
View file

@ -448,6 +448,7 @@ static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
{
struct sctp_ulpevent *event = sctp_skb2event(skb);
skb_orphan(skb);
skb->sk = sk;
skb->destructor = sctp_sock_rfree;
atomic_add(event->rmem_len, &sk->sk_rmem_alloc);

2
include/net/sock.h
View file

@ -1250,6 +1250,7 @@ static inline int sk_has_allocations(const struct sock *sk)
static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
{
skb_orphan(skb);
skb->sk = sk;
skb->destructor = sock_wfree;
/*
@ -1262,6 +1263,7 @@ static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
{
skb_orphan(skb);
skb->sk = sk;
skb->destructor = sock_rfree;
atomic_add(skb->truesize, &sk->sk_rmem_alloc);

3
net/ax25/ax25_in.c
View file

@ -437,8 +437,7 @@ static int ax25_rcv(struct sk_buff *skb, struct net_device *dev,
int ax25_kiss_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *ptype, struct net_device *orig_dev)
{
skb->sk = NULL; /* Initially we don't know who it's for */
skb->destructor = NULL; /* Who initializes this, dammit?! */
skb_orphan(skb);
if (!net_eq(dev_net(dev), &init_net)) {
kfree_skb(skb);

2
net/core/dev.c
View file

@ -2310,8 +2310,6 @@ int netif_receive_skb(struct sk_buff *skb)
if (!skb)
goto out;
skb_orphan(skb);
type = skb->protocol;
list_for_each_entry_rcu(ptype,
&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {

3
net/irda/af_irda.c
View file

@ -913,9 +913,6 @@ static int irda_accept(struct socket *sock, struct socket *newsock, int flags)
/* Clean up the original one to keep it in listen state */
irttp_listen(self->tsap);
/* Wow ! What is that ? Jean II */
skb->sk = NULL;
skb->destructor = NULL;
kfree_skb(skb);
sk->sk_ack_backlog--;

1
net/irda/ircomm/ircomm_lmp.c
View file

@ -196,6 +196,7 @@ static int ircomm_lmp_data_request(struct ircomm_cb *self,
/* Don't forget to refcount it - see ircomm_tty_do_softint() */
skb_get(skb);
skb_orphan(skb);
skb->destructor = ircomm_lmp_flow_control;
if ((self->pkt_count++ > 7) && (self->flow_status == FLOW_START)) {