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[TCP]: Account skb overhead in tcp_fragment

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Make sure that we get the full sizeof(struct sk_buff)
plus the data size accounted for in skb->truesize.

This will create invariants that will allow adding
assertion checks on skb->truesize.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2006-04-19 21:35:00 -07:00 committed by David S. Miller
parent d47f3640fe
commit b60b49ea6a
1 changed files with 7 additions and 3 deletions
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10
net/ipv4/tcp_output.c
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@ -533,6 +533,7 @@ int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len, unsigned int mss
struct tcp_sock *tp = tcp_sk(sk);
struct sk_buff *buff;
int nsize, old_factor;
int nlen;
u16 flags;
BUG_ON(len > skb->len);
@ -552,8 +553,10 @@ int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len, unsigned int mss
if (buff == NULL)
return -ENOMEM; /* We'll just try again later. */
buff->truesize = skb->len - len;
skb->truesize -= buff->truesize;
sk_charge_skb(sk, buff);
nlen = skb->len - len - nsize;
buff->truesize += nlen;
skb->truesize -= nlen;
/* Correct the sequence numbers. */
TCP_SKB_CB(buff)->seq = TCP_SKB_CB(skb)->seq + len;
@ -1039,7 +1042,8 @@ static int tso_fragment(struct sock *sk, struct sk_buff *skb, unsigned int len,
if (unlikely(buff == NULL))
return -ENOMEM;
buff->truesize = nlen;
sk_charge_skb(sk, buff);
buff->truesize += nlen;
skb->truesize -= nlen;
/* Correct the sequence numbers. */