tcp: fix range tcp_shifted_skb() passes to tcp_sacktag_one()

Fix the newly-SACKed range to be the range of newly-shifted bytes.

Previously - since 832d11c5cd076abc0aa1eaf7be96c81d1a59ce41 -
tcp_shifted_skb() incorrectly called tcp_sacktag_one() with the start
and end sequence numbers of the skb it passes in set to the range just
beyond the range that is newly-SACKed.

This commit also removes a special-case adjustment to lost_cnt_hint in
tcp_shifted_skb() since the pre-existing adjustment of lost_cnt_hint
in tcp_sacktag_one() now properly handles this things now that the
correct start sequence number is passed in.

Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 9 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 4e8a81fda65c..8116d06e042c 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1388,6 +1388,9 @@ static u8 tcp_sacktag_one(struct sock *sk,
         return sacked;
 }
 
+/* Shift newly-SACKed bytes from this skb to the immediately previous
+ * already-SACKed sk_buff. Mark the newly-SACKed bytes as such.
+ */
 static int tcp_shifted_skb(struct sock *sk, struct sk_buff *skb,
                            struct tcp_sacktag_state *state,
                            unsigned int pcount, int shifted, int mss,
@@ -1395,12 +1398,11 @@ static int tcp_shifted_skb(struct sock *sk, struct sk_buff *skb,
 {
         struct tcp_sock *tp = tcp_sk(sk);
         struct sk_buff *prev = tcp_write_queue_prev(sk, skb);
+        u32 start_seq = TCP_SKB_CB(skb)->seq;   /* start of newly-SACKed */
+        u32 end_seq = start_seq + shifted;      /* end of newly-SACKed */
 
         BUG_ON(!pcount);
 
-        if (skb == tp->lost_skb_hint)
-                tp->lost_cnt_hint += pcount;
-
         TCP_SKB_CB(prev)->end_seq += shifted;
         TCP_SKB_CB(skb)->seq += shifted;
 
@@ -1424,12 +1426,11 @@ static int tcp_shifted_skb(struct sock *sk, struct sk_buff *skb,
                 skb_shinfo(skb)->gso_type = 0;
         }
 
-        /* We discard results */
-        tcp_sacktag_one(sk, state,
-                        TCP_SKB_CB(skb)->sacked,
-                        TCP_SKB_CB(skb)->seq,
-                        TCP_SKB_CB(skb)->end_seq,
-                        dup_sack, pcount);
+        /* Adjust counters and hints for the newly sacked sequence range but
+         * discard the return value since prev is already marked.
+         */
+        tcp_sacktag_one(sk, state, TCP_SKB_CB(skb)->sacked,
+                        start_seq, end_seq, dup_sack, pcount);
 
         /* Difference in this won't matter, both ACKed by the same cumul. ACK */
         TCP_SKB_CB(prev)->sacked |= (TCP_SKB_CB(skb)->sacked & TCPCB_EVER_RETRANS);