Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

[linux-2.6-microblaze.git] / net / ipv4 / tcp_ipv4.c

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index fed3f1c..3b2711e 100644 (file)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -156,11 +156,24 @@ int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp)
         */
        if (tcptw->tw_ts_recent_stamp &&
            (!twp || (reuse && get_seconds() - tcptw->tw_ts_recent_stamp > 1))) {
-               tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2;
-               if (tp->write_seq == 0)
-                       tp->write_seq = 1;
-               tp->rx_opt.ts_recent       = tcptw->tw_ts_recent;
-               tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp;
+               /* In case of repair and re-using TIME-WAIT sockets we still
+                * want to be sure that it is safe as above but honor the
+                * sequence numbers and time stamps set as part of the repair
+                * process.
+                *
+                * Without this check re-using a TIME-WAIT socket with TCP
+                * repair would accumulate a -1 on the repair assigned
+                * sequence number. The first time it is reused the sequence
+                * is -1, the second time -2, etc. This fixes that issue
+                * without appearing to create any others.
+                */
+               if (likely(!tp->repair)) {
+                       tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2;
+                       if (tp->write_seq == 0)
+                               tp->write_seq = 1;
+                       tp->rx_opt.ts_recent       = tcptw->tw_ts_recent;
+                       tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp;
+               }
                sock_hold(sktw);
                return 1;
        }
@@ -1730,6 +1743,10 @@ process:
                        reqsk_put(req);
                        goto discard_it;
                }
+               if (tcp_checksum_complete(skb)) {
+                       reqsk_put(req);
+                       goto csum_error;
+               }
                if (unlikely(sk->sk_state != TCP_LISTEN)) {
                        inet_csk_reqsk_queue_drop_and_put(sk, req);
                        goto lookup;