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| author | Michael Tuexen <tuexen@FreeBSD.org> | 2018-06-01 21:24:27 +0000 |
|---|---|---|
| committer | Michael Tuexen <tuexen@FreeBSD.org> | 2018-06-01 21:24:27 +0000 |
| commit | c14f9fe5ef39595ed327cffc050cbc5601f64896 (patch) | |
| tree | 842978612e46b05fa5cf5074095ee67f66e8f256 | |
| parent | a19dca2dfd63cb0205c6fac1fc0c4e00e8bea89a (diff) | |
| download | src-c14f9fe5ef39595ed327cffc050cbc5601f64896.tar.gz src-c14f9fe5ef39595ed327cffc050cbc5601f64896.zip | |
Limit the retransmission timer for SYN-ACKs by TCPTV_REXMTMAX.
Use the same logic to handle the SYN-ACK retransmission when sent from
the syn cache code as when sent from the main code.
MFC after: 3 days
Sponsored by: Netflix, Inc.
Notes
Notes:
svn path=/head/; revision=334497
| -rw-r--r-- | sys/netinet/tcp_syncache.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/sys/netinet/tcp_syncache.c b/sys/netinet/tcp_syncache.c index cf5fcd666b11..2fb3f1486c4d 100644 --- a/sys/netinet/tcp_syncache.c +++ b/sys/netinet/tcp_syncache.c @@ -415,8 +415,14 @@ syncache_drop(struct syncache *sc, struct syncache_head *sch) static void syncache_timeout(struct syncache *sc, struct syncache_head *sch, int docallout) { - sc->sc_rxttime = ticks + - TCPTV_RTOBASE * (tcp_syn_backoff[sc->sc_rxmits]); + int rexmt; + + if (sc->sc_rxmits == 0) + rexmt = TCPTV_RTOBASE; + else + TCPT_RANGESET(rexmt, TCPTV_RTOBASE * tcp_syn_backoff[sc->sc_rxmits], + tcp_rexmit_min, TCPTV_REXMTMAX); + sc->sc_rxttime = ticks + rexmt; sc->sc_rxmits++; if (TSTMP_LT(sc->sc_rxttime, sch->sch_nextc)) { sch->sch_nextc = sc->sc_rxttime; |