diff options
| -rw-r--r-- | include/linux/skbuff.h | 11 | ||||
| -rw-r--r-- | net/core/skbuff.c | 11 | ||||
| -rw-r--r-- | net/ipv4/tcp_output.c | 10 |
3 files changed, 24 insertions, 8 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index cec0657..12e6fed 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -568,8 +568,9 @@ extern struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t priority); extern struct sk_buff *skb_copy(const struct sk_buff *skb, gfp_t priority); -extern struct sk_buff *pskb_copy(struct sk_buff *skb, - gfp_t gfp_mask); +extern struct sk_buff *__pskb_copy(struct sk_buff *skb, + int headroom, gfp_t gfp_mask); + extern int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail, gfp_t gfp_mask); @@ -1799,6 +1800,12 @@ static inline dma_addr_t skb_frag_dma_map(struct device *dev, frag->page_offset + offset, size, dir); } +static inline struct sk_buff *pskb_copy(struct sk_buff *skb, + gfp_t gfp_mask) +{ + return __pskb_copy(skb, skb_headroom(skb), gfp_mask); +} + /** * skb_clone_writable - is the header of a clone writable * @skb: buffer to check diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 678ae4e..fd36462 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -840,8 +840,9 @@ struct sk_buff *skb_copy(const struct sk_buff *skb, gfp_t gfp_mask) EXPORT_SYMBOL(skb_copy); /** - * pskb_copy - create copy of an sk_buff with private head. + * __pskb_copy - create copy of an sk_buff with private head. * @skb: buffer to copy + * @headroom: headroom of new skb * @gfp_mask: allocation priority * * Make a copy of both an &sk_buff and part of its data, located @@ -852,16 +853,16 @@ EXPORT_SYMBOL(skb_copy); * The returned buffer has a reference count of 1. */ -struct sk_buff *pskb_copy(struct sk_buff *skb, gfp_t gfp_mask) +struct sk_buff *__pskb_copy(struct sk_buff *skb, int headroom, gfp_t gfp_mask) { - unsigned int size = skb_end_pointer(skb) - skb->head; + unsigned int size = skb_headlen(skb) + headroom; struct sk_buff *n = alloc_skb(size, gfp_mask); if (!n) goto out; /* Set the data pointer */ - skb_reserve(n, skb_headroom(skb)); + skb_reserve(n, headroom); /* Set the tail pointer and length */ skb_put(n, skb_headlen(skb)); /* Copy the bytes */ @@ -897,7 +898,7 @@ struct sk_buff *pskb_copy(struct sk_buff *skb, gfp_t gfp_mask) out: return n; } -EXPORT_SYMBOL(pskb_copy); +EXPORT_SYMBOL(__pskb_copy); /** * pskb_expand_head - reallocate header of &sk_buff diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 58f69ac..50788d6 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -2147,7 +2147,15 @@ int tcp_retransmit_skb(struct sock *sk, struct sk_buff *skb) */ TCP_SKB_CB(skb)->when = tcp_time_stamp; - err = tcp_transmit_skb(sk, skb, 1, GFP_ATOMIC); + /* make sure skb->data is aligned on arches that require it */ + if (unlikely(NET_IP_ALIGN && ((unsigned long)skb->data & 3))) { + struct sk_buff *nskb = __pskb_copy(skb, MAX_TCP_HEADER, + GFP_ATOMIC); + err = nskb ? tcp_transmit_skb(sk, nskb, 0, GFP_ATOMIC) : + -ENOBUFS; + } else { + err = tcp_transmit_skb(sk, skb, 1, GFP_ATOMIC); + } if (err == 0) { /* Update global TCP statistics. */ |
