CVS commit: [netbsd-8] src/sys

["Martin Husemann" <martin%netbsd.org@localhost>]

Module Name:    src
Committed By:   martin
Date:           Mon Feb 26 13:32:01 UTC 2018

Modified Files:
        src/sys/netinet [netbsd-8]: in.c ip_input.c wqinput.c
        src/sys/netinet6 [netbsd-8]: in6.c ip6_input.c
        src/sys/rump/net/lib/libnetinet [netbsd-8]: netinet_component.c

Log Message:
Pull up following revision(s) (requested by ozaki-r in ticket #588):
        sys/netinet6/in6.c: revision 1.260
        sys/netinet/in.c: revision 1.219
        sys/netinet/wqinput.c: revision 1.4
        sys/rump/net/lib/libnetinet/netinet_component.c: revision 1.11
        sys/netinet/ip_input.c: revision 1.376
        sys/netinet6/ip6_input.c: revision 1.193
Avoid a deadlock between softnet_lock and IFNET_LOCK

A deadlock occurs because there is a violation of the rule of lock ordering;
softnet_lock is held with hodling IFNET_LOCK, which violates the rule.
To avoid the deadlock, replace softnet_lock in in_control and in6_control
with KERNEL_LOCK.

We also need to add some KERNEL_LOCKs to protect the network stack surely.
This is required, for example, for PR kern/51356.

Fix PR kern/53043


To generate a diff of this commit:
cvs rdiff -u -r1.203.2.9 -r1.203.2.10 src/sys/netinet/in.c
cvs rdiff -u -r1.355.2.4 -r1.355.2.5 src/sys/netinet/ip_input.c
cvs rdiff -u -r1.3 -r1.3.2.1 src/sys/netinet/wqinput.c
cvs rdiff -u -r1.245.2.7 -r1.245.2.8 src/sys/netinet6/in6.c
cvs rdiff -u -r1.178.2.5 -r1.178.2.6 src/sys/netinet6/ip6_input.c
cvs rdiff -u -r1.8.6.1 -r1.8.6.2 \
    src/sys/rump/net/lib/libnetinet/netinet_component.c

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