Fix deadlock in IPv6 PCB code.
When several threads are trying to send datagram to the same destination,
but fragmentation is disabled and datagram size exceeds link MTU,
ip6_output() calls pfctlinput2(PRC_MSGSIZE). It does notify all
sockets wanted to know MTU to this destination. And since all threads
hold PCB lock while sending, taking the lock for each PCB in the
in6_pcbnotify() leads to deadlock.
RFC 3542 p.11.3 suggests notify all application wanted to receive
IPV6_PATHMTU ancillary data for each ICMPv6 packet too big message.
But it doesn't require this, when we don't receive ICMPv6 message.
Change ip6_notify_pmtu() function to be able use it directly from
ip6_output() to notify only one socket, and to notify all sockets
when ICMPv6 packet too big message received.
MFC r279684:
tcp6_ctlinput() doesn't pass MTU value to in6_pcbnotify().
Check cmdarg isn't NULL before dereference, this check was in the
ip6_notify_pmtu() before r279588.
PR: 197059
Sponsored by: Yandex LLC
86de47baf2