Extend sockstat to display the TCP congestion control

[tuexen]

Summary

This patch adds the -C option to sockstat, which enables the displaying of the name of the congestion control module used by a TCP connection.

This depends on D26412.

[rscheff]

usr.bin/sockstat/sockstat.c

1150

Why not structure this right away similar to the above, to allow easy extention if additional columns get added later?

Also, if TCP specific columns are kept at the tail, you could check for IPPROTO_TCP first - or do we have STCP specific columns already? Also, wouldn't SCTP also be able to use different CC's, thinking about it?

[tuexen]

Address Richard's comment.

[tuexen]

usr.bin/sockstat/sockstat.c

1150

Code updated to use the same patter as above.

Yes, SCTP has CC modules and I plan to make them supported here in the future, too.