CVS commit: src/sys

["Ryota Ozaki" <ozaki-r%netbsd.org@localhost>]

Module Name:    src
Committed By:   ozaki-r
Date:           Fri Aug  7 08:11:33 UTC 2015

Modified Files:
        src/sys/net: rtsock.c
        src/sys/netinet: if_arp.c ip_input.c ip_output.c
        src/sys/netinet6: icmp6.c in6.c in6.h ip6_forward.c ip6_id.c
            ip6_mroute.c nd6.c nd6_rtr.c
        src/sys/sys: timevar.h

Log Message:
Use time_uptime instead of time_second to avoid time leaps

Some codes in sys/net* use time_second to manage time periods such as
cache expirations. However, time_second doesn't increase monotonically
and can leap by say settimeofday(2) according to time_second(9). We
should use time_uptime instead of it to avoid such time leaps.

This change replaces time_second with time_uptime. Additionally it
converts a time based on time_uptime to a time based on time_second
when the kernel passes the time to userland programs that expect
the latter, and vice versa.

Note that we shouldn't leak time_uptime to other hosts over the
netowrk. My investigation shows there is no such leak:
http://mail-index.netbsd.org/tech-net/2015/08/06/msg005332.html

Discussed on tech-kern and tech-net.


To generate a diff of this commit:
cvs rdiff -u -r1.172 -r1.173 src/sys/net/rtsock.c
cvs rdiff -u -r1.170 -r1.171 src/sys/netinet/if_arp.c
cvs rdiff -u -r1.322 -r1.323 src/sys/netinet/ip_input.c
cvs rdiff -u -r1.244 -r1.245 src/sys/netinet/ip_output.c
cvs rdiff -u -r1.172 -r1.173 src/sys/netinet6/icmp6.c
cvs rdiff -u -r1.188 -r1.189 src/sys/netinet6/in6.c
cvs rdiff -u -r1.84 -r1.85 src/sys/netinet6/in6.h
cvs rdiff -u -r1.76 -r1.77 src/sys/netinet6/ip6_forward.c
cvs rdiff -u -r1.17 -r1.18 src/sys/netinet6/ip6_id.c
cvs rdiff -u -r1.107 -r1.108 src/sys/netinet6/ip6_mroute.c
cvs rdiff -u -r1.165 -r1.166 src/sys/netinet6/nd6.c
cvs rdiff -u -r1.101 -r1.102 src/sys/netinet6/nd6_rtr.c
cvs rdiff -u -r1.33 -r1.34 src/sys/sys/timevar.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.