The function __pppoe_xmit modifies the skb data and therefore it needs
to copy and skb data if it's cloned.
In fact, it currently allocates a new skb so that it can return 0 in
case of error without freeing the original skb. This is totally wrong
because returning zero is meant to indicate congestion whereupon pppoe
is supposed to wake up the upper layer once the congestion subsides.
This makes sense for ppp_async and ppp_sync but is out-of-place for
pppoe. This patch makes it always return 1 and free the skb.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
struct net_device *dev = po->pppoe_dev;
struct pppoe_hdr hdr;
struct pppoe_hdr *ph;
struct net_device *dev = po->pppoe_dev;
struct pppoe_hdr hdr;
struct pppoe_hdr *ph;
- int headroom = skb_headroom(skb);
if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
goto abort;
if (sock_flag(sk, SOCK_DEAD) || !(sk->sk_state & PPPOX_CONNECTED))
goto abort;
- /* Copy the skb if there is no space for the header. */
- if (headroom < (sizeof(struct pppoe_hdr) + dev->hard_header_len)) {
- skb2 = dev_alloc_skb(32+skb->len +
- sizeof(struct pppoe_hdr) +
- dev->hard_header_len);
-
- if (skb2 == NULL)
- goto abort;
-
- skb_reserve(skb2, dev->hard_header_len + sizeof(struct pppoe_hdr));
- skb_copy_from_linear_data(skb, skb_put(skb2, skb->len),
- skb->len);
- } else {
- /* Make a clone so as to not disturb the original skb,
- * give dev_queue_xmit something it can free.
- */
- skb2 = skb_clone(skb, GFP_ATOMIC);
-
- if (skb2 == NULL)
- goto abort;
- }
+ /* Copy the data if there is no space for the header or if it's
+ * read-only.
+ */
+ if (skb_cow(skb, sizeof(*ph) + dev->hard_header_len))
+ goto abort;
- ph = (struct pppoe_hdr *) skb_push(skb2, sizeof(struct pppoe_hdr));
+ ph = (struct pppoe_hdr *) skb_push(skb, sizeof(struct pppoe_hdr));
memcpy(ph, &hdr, sizeof(struct pppoe_hdr));
memcpy(ph, &hdr, sizeof(struct pppoe_hdr));
- skb2->protocol = __constant_htons(ETH_P_PPP_SES);
+ skb->protocol = __constant_htons(ETH_P_PPP_SES);
- skb_reset_network_header(skb2);
+ skb_reset_network_header(skb);
- dev->hard_header(skb2, dev, ETH_P_PPP_SES,
+ dev->hard_header(skb, dev, ETH_P_PPP_SES,
po->pppoe_pa.remote, NULL, data_len);
po->pppoe_pa.remote, NULL, data_len);
- /* We're transmitting skb2, and assuming that dev_queue_xmit
- * will free it. The generic ppp layer however, is expecting
- * that we give back 'skb' (not 'skb2') in case of failure,
- * but free it in case of success.
- */
-
- if (dev_queue_xmit(skb2) < 0)
+ if (dev_queue_xmit(skb) < 0)
+ kfree_skb(skb);
+ return 1;