Author: tuexen
Date: Thu Jun 1 15:11:18 2017
New Revision: 319433
URL: https://svnweb.freebsd.org/changeset/base/319433
Log:
Improve comments to describe what the code does.
Reported by: jtl
Sponsored by: Netflix, Inc.
Modified:
head/sys/netinet/tcp_input.c
head/sys/netinet/tcp_stacks/fastpath.c
Modified: head/sys/netinet/tcp_input.c
==============================================================================
--- head/sys/netinet/tcp_input.c Thu Jun 1 15:03:43 2017
(r319432)
+++ head/sys/netinet/tcp_input.c Thu Jun 1 15:11:18 2017
(r319433)
@@ -2011,8 +2011,10 @@ tcp_do_segment(struct mbuf *m, struct tcphdr *th, stru
/*
* If the state is SYN_SENT:
- * if seg contains a RST, then drop the connection.
- * if seg does not contain SYN, then drop it.
+ * if seg contains a RST with valid ACK (SEQ.ACK has already
+ * been verified), then drop the connection.
+ * if seg contains a RST without an ACK, drop the seg.
+ * if seg does not contain SYN, then drop the seg.
* Otherwise this is an acceptable SYN segment
* initialize tp->rcv_nxt and tp->irs
* if seg contains ack then advance tp->snd_una
Modified: head/sys/netinet/tcp_stacks/fastpath.c
==============================================================================
--- head/sys/netinet/tcp_stacks/fastpath.c Thu Jun 1 15:03:43 2017
(r319432)
+++ head/sys/netinet/tcp_stacks/fastpath.c Thu Jun 1 15:11:18 2017
(r319433)
@@ -497,8 +497,10 @@ tcp_do_slowpath(struct mbuf *m, struct tcphdr *th, str
/*
* If the state is SYN_SENT:
- * if seg contains a RST, then drop the connection.
- * if seg does not contain SYN, then drop it.
+ * if seg contains a RST with valid ACK (SEQ.ACK has already
+ * been verified), then drop the connection.
+ * if seg contains a RST without an ACK, drop the seg.
+ * if seg does not contain SYN, then drop the seg.
* Otherwise this is an acceptable SYN segment
* initialize tp->rcv_nxt and tp->irs
* if seg contains ack then advance tp->snd_una
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