bblog: inherit TCP_LOG option

[tuexen]

Summary

When the TCP_LOG option is used to enable logging on a listening socket, inherit this if the listener is not auto selected and does not have a log id set.

Test Plan

Run the following packetdrill script:

 0.000 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0.000 setsockopt(3, IPPROTO_TCP, TCP_LOG, [TCP_LOG_STATE_CONTINUAL], 4) = 0
+0.000 setsockopt(3, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
+0.000 bind(3, ..., ...) = 0
+0.000 listen(3, 1) = 0
+0.000 < S  0:0(0)       win 32767 <mss 1460,sackOK,eol,eol>
+0.000 > S. 0:0(0) ack 1 win 65535 <mss 1460,sackOK,eol,eol>
+0.050 <  . 1:1(0) ack 1 win 32767
+0.000 accept(3, ..., ...) = 4
+0.000 getsockopt(3, IPPROTO_TCP, TCP_LOG, [TCP_LOG_STATE_CONTINUAL], [4]) = 0
+0.000 getsockopt(4, IPPROTO_TCP, TCP_LOG, [TCP_LOG_STATE_CONTINUAL], [4]) = 0
+0.000 close(3) = 0
+0.000 close(4) = 0
+0.000 > F. 1:1(0) ack 1 win 65535
+0.050 < F. 1:1(0) ack 2 win 32767
+0.000 >  . 2:2(0) ack 2 win 65535

[cc]

Please revise the SUMMARY part: "if the listener is not auto selected or has a log id set." => "if the listener is not auto selected or does not have a log id set."

[cc]

sys/netinet/tcp_syncache.c

1030

Looks in default t_logstate is TCP_LOG_STATE_OFF, so check this first can save further checks in default.

[tuexen]

In D38436#874676, @guest-ccui wrote:

Please revise the SUMMARY part: "if the listener is not auto selected or has a log id set." => "if the listener is not auto selected or does not have a log id set."

Change to: and does not have

[tuexen]

Address comments.

[tuexen]

Update to latest version of the main tree.