net-timestamp: fix missing tcp fragmentation cases
Bytestream timestamps are correlated with a single byte in the skbuff, recorded in skb_shinfo(skb)->tskey. When fragmenting skbuffs, ensure that the tskey is set for the fragment in which the tskey falls (seqno <= tskey < end_seqno). The original implementation did not address fragmentation in tcp_fragment or tso_fragment. Add code to inspect the sequence numbers and move both tskey and the relevant tx_flags if necessary. Reported-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
712a72213f
commit
490cc7d03c
1 changed files with 17 additions and 0 deletions
|
@ -1069,6 +1069,21 @@ static void tcp_adjust_pcount(struct sock *sk, const struct sk_buff *skb, int de
|
||||||
tcp_verify_left_out(tp);
|
tcp_verify_left_out(tp);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
static void tcp_fragment_tstamp(struct sk_buff *skb, struct sk_buff *skb2)
|
||||||
|
{
|
||||||
|
struct skb_shared_info *shinfo = skb_shinfo(skb);
|
||||||
|
|
||||||
|
if (unlikely(shinfo->tx_flags & SKBTX_ANY_TSTAMP) &&
|
||||||
|
!before(shinfo->tskey, TCP_SKB_CB(skb2)->seq)) {
|
||||||
|
struct skb_shared_info *shinfo2 = skb_shinfo(skb2);
|
||||||
|
u8 tsflags = shinfo->tx_flags & SKBTX_ANY_TSTAMP;
|
||||||
|
|
||||||
|
shinfo->tx_flags &= ~tsflags;
|
||||||
|
shinfo2->tx_flags |= tsflags;
|
||||||
|
swap(shinfo->tskey, shinfo2->tskey);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
/* Function to create two new TCP segments. Shrinks the given segment
|
/* Function to create two new TCP segments. Shrinks the given segment
|
||||||
* to the specified size and appends a new segment with the rest of the
|
* to the specified size and appends a new segment with the rest of the
|
||||||
* packet to the list. This won't be called frequently, I hope.
|
* packet to the list. This won't be called frequently, I hope.
|
||||||
|
@ -1136,6 +1151,7 @@ int tcp_fragment(struct sock *sk, struct sk_buff *skb, u32 len,
|
||||||
*/
|
*/
|
||||||
TCP_SKB_CB(buff)->when = TCP_SKB_CB(skb)->when;
|
TCP_SKB_CB(buff)->when = TCP_SKB_CB(skb)->when;
|
||||||
buff->tstamp = skb->tstamp;
|
buff->tstamp = skb->tstamp;
|
||||||
|
tcp_fragment_tstamp(skb, buff);
|
||||||
|
|
||||||
old_factor = tcp_skb_pcount(skb);
|
old_factor = tcp_skb_pcount(skb);
|
||||||
|
|
||||||
|
@ -1652,6 +1668,7 @@ static int tso_fragment(struct sock *sk, struct sk_buff *skb, unsigned int len,
|
||||||
|
|
||||||
buff->ip_summed = skb->ip_summed = CHECKSUM_PARTIAL;
|
buff->ip_summed = skb->ip_summed = CHECKSUM_PARTIAL;
|
||||||
skb_split(skb, buff, len);
|
skb_split(skb, buff, len);
|
||||||
|
tcp_fragment_tstamp(skb, buff);
|
||||||
|
|
||||||
/* Fix up tso_factor for both original and new SKB. */
|
/* Fix up tso_factor for both original and new SKB. */
|
||||||
tcp_set_skb_tso_segs(sk, skb, mss_now);
|
tcp_set_skb_tso_segs(sk, skb, mss_now);
|
||||||
|
|
Loading…
Reference in a new issue