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Change RFC1323 timestamp update rule per Section 3.4 of RFC1323.bis. Old

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rule was to update the timestamp if the sequence numbers are in range.  New
rule adds a check that the timestamp is advancing, thus preventing our notion
of the most recent timestamp from incorrectly moving backwards.
This commit is contained in:
thorpej 1998-04-29 00:43:46 +00:00
parent a152517daa
commit 100bfaf39a
1 changed files with 5 additions and 4 deletions
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9
sys/netinet/tcp_input.c
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@ -1,4 +1,4 @@
/* $NetBSD: tcp_input.c,v 1.52 1998/04/28 21:52:16 thorpej Exp $ */
/* $NetBSD: tcp_input.c,v 1.53 1998/04/29 00:43:46 thorpej Exp $ */
/*-
* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
@ -897,9 +897,10 @@ after_listen:
/*
* If last ACK falls within this segment's sequence numbers,
* record its timestamp.
* and the timestamp is newer, record it.
*/
if (opti.ts_present && SEQ_LEQ(ti->ti_seq, tp->last_ack_sent) &&
if (opti.ts_present && TSTMP_GEQ(opti.ts_val, tp->ts_recent) &&
SEQ_LEQ(ti->ti_seq, tp->last_ack_sent) &&
SEQ_LT(tp->last_ack_sent, ti->ti_seq + ti->ti_len +
((tiflags & (TH_SYN|TH_FIN)) != 0))) {
tp->ts_recent_age = tcp_now;
@ -2228,7 +2229,7 @@ syn_cache_respond(sc, m, ti, win, ts)
MH_ALIGN(m, sizeof(*ti) + optlen);
m->m_next = m0; /* this gets freed below */
}
ovbcopy((caddr_t)ti, mtod(m, caddr_t), sizeof(*ti));
bcopy((caddr_t)ti, mtod(m, caddr_t), sizeof(*ti));
ti = mtod(m, struct tcpiphdr *);
}