From b60b49ea6a3e1f8dcaf4148dad0daab61ab766d2 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Wed, 19 Apr 2006 21:35:00 -0700 Subject: [PATCH] [TCP]: Account skb overhead in tcp_fragment 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 Signed-off-by: David S. Miller --- net/ipv4/tcp_output.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index 44df1db..a28ae59 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -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. */ -- 2.7.4