- oldstyle and PHDS IPv4+ARP; RARP, IPv6, Appletalk are matched now.
- in case this is an unfragmented or first-fragment IPv4, IPv6, ARP, RARP or
Appletalk packet, matching inside the payload is possible to the extent
already supported by tcpdump/libpcap. For 2nd and next fragments, this
won't work; it also won't work for oldstyle (RFC1051) IPv4 and ARP.
Avoid forwarding ip unicast packets which were contained inside
link-level multicast packets; having M_MCAST still set in the packet
header flags will mean that the packet will get multicast to a bogus
group instead of unicast to the next hop.
Malformed packets like this have occasionally been spotted "in the
wild" on a mediaone cable modem segment which also had multiple netbsd
machines running as router/NAT boxes.
Without this, any subnet with multiple netbsd routers receiving all
multicasts will generate a packet storm on receipt of such a
multicast. Note that we already do the same check here for link-level
broadcasts; ip6_forward already does this as well.
Note that multicast forwarding does not go through ip_forward().
Adding some code to if_ethersubr to sanity check link-level
vs. ip-level multicast addresses might also be worthwhile.
kill local definition of Debugger() - <sys/systm.h> DTRT
don't assume Debugger() is always available and put the call inside #ifdef DDB
Second part of a fix to PR #8637 by Izumi Tsutsui <tsutsui@ceres.dti.ne.jp>.
not set, unlock the vnode before calling the device's close routine and
relock it after it returns. tty close routines will sleep waiting for
buffers to drain, which won't happen often times as the other side needs
to grab the vnode lock first.
Make all unmount routines lock the device vnode before calling VOP_CLOSE().
just because the latter returned a NULL - that may normally happen,
when the process is, for example, a kernel thread
procfs_getargv(): if the name is brackened in '(' and ')', just
return NULL immediately - the code in command() will DTRT
and the output will be same for procfs- and kvm- based lookup
in all cases
pk