diff options
| author | eadler <eadler@FreeBSD.org> | 2013-12-02 03:11:25 +0000 |
|---|---|---|
| committer | eadler <eadler@FreeBSD.org> | 2013-12-02 03:11:25 +0000 |
| commit | 4b0ef166458c9fb244b7a29f546d7b192fa91122 (patch) | |
| tree | 3bf03e51809eb6162879760894e823b019d08db4 /sys/netinet | |
| parent | 05f6c6f5a16a306a67836346e305c89d896e74da (diff) | |
| download | FreeBSD-src-4b0ef166458c9fb244b7a29f546d7b192fa91122.zip FreeBSD-src-4b0ef166458c9fb244b7a29f546d7b192fa91122.tar.gz | |
In a situation where:
- The remote host sends a FIN
- in an ACK for a sequence number for which an ACK has already
been received
- There is still unacked data on route to the remote host
- The packet does not contain a window update
The packet may be dropped without processing the FIN flag.
PR: kern/99188
Submitted by: Staffan Ulfberg <staffan@ulfberg.se>
Discussed with: andre
MFC after: never
Diffstat (limited to 'sys/netinet')
| -rw-r--r-- | sys/netinet/tcp_input.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c index 53df1a7..b9e0f42 100644 --- a/sys/netinet/tcp_input.c +++ b/sys/netinet/tcp_input.c @@ -2429,13 +2429,15 @@ tcp_do_segment(struct mbuf *m, struct tcphdr *th, struct socket *so, hhook_run_tcp_est_in(tp, th, &to); if (SEQ_LEQ(th->th_ack, tp->snd_una)) { - if (tlen == 0 && tiwin == tp->snd_wnd) { + if (tlen == 0 && tiwin == tp->snd_wnd && + !(thflags & TH_FIN)) { TCPSTAT_INC(tcps_rcvdupack); /* * If we have outstanding data (other than * a window probe), this is a completely * duplicate ack (ie, window info didn't - * change), the ack is the biggest we've + * change and FIN isn't set), + * the ack is the biggest we've * seen and we've seen exactly our rexmt * threshhold of them, assume a packet * has been dropped and retransmit it. |
