Add missing #if's to fix build without bpf(4).

ok deraadt@

Leave default ifq_maxlen handling to ifq_init()

Most clonable interface drivers (except bridge, enc, loop, pppx,
switch, trunk and vlan) initialise the send queue's length to IFQ_MAXLEN
during *_clo

Leave default ifq_maxlen handling to ifq_init()

Most clonable interface drivers (except bridge, enc, loop, pppx,
switch, trunk and vlan) initialise the send queue's length to IFQ_MAXLEN
during *_clone_create() even though ifq_init(), which is eventually called
through if_attach(), does the same.

Remove all early "ifq_set_maxlen(&ifq->if_snd, IFQ_MAXLEN);" lines to leave
it to ifq_init() and have clonable drivers a tad more in sync.

OK mvs

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vether(4) is pretty dummy. It contains nothing requires to be protected.
So set `IFXF_MPSAFE' bit. This allows to discard outgoing packets without
kernel lock.

ok kn@

Add missing `IFXF_CLONED' flag to clone interfaces.

ok mpi@

Change users of IFQ_SET_MAXLEN() and IFQ_IS_EMPTY() to use the "new" API.

ok dlg@ tobhe@

Change users of IFQ_DEQUEUE(), IFQ_ENQUEUE() and IFQ_LEN() to use the
"new" API.

ok dlg@ tobhe@

Creating a cloned interface could return ENOMEM due to temporary
memory shortage. As it is invoked from a system call, it should
not fail and wait instead.
OK visa@ mpi@

move counting if_opackets next to counting if_obytes in if_enqueue.

this means packets are consistently counted in one place, unlike the
many and various ways that drivers thought they should do it.

move counting if_opackets next to counting if_obytes in if_enqueue.

this means packets are consistently counted in one place, unlike the
many and various ways that drivers thought they should do it.

ok mpi@ deraadt@

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For virtual Ethernet drivers that don't have a technical limit of the
hardmtu, pick a value of 65435 that leaves space for some
encapsulation and almost a complete max-IP packet. After some
discussi

For virtual Ethernet drivers that don't have a technical limit of the
hardmtu, pick a value of 65435 that leaves space for some
encapsulation and almost a complete max-IP packet. After some
discussion we picked this arbitrary value.

OK dlg@

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We're always ready! So send IFQ_SET_READY() to the bitbucket.

remove old lint annotations

arp_ifinit() is no longer required.

Pass output packets to bpf(4). This is helpful when debugging stack
issues.

ok reyk@

Remove some includes include-what-you-use claims don't
have any direct symbols used. Tested for indirect use by compiling
amd64/i386/sparc64 kernels.

ok tedu@ deraadt@

unifdef INET in net code as a precursor to removing the pretend option.
long live the one true internet.
ok henning mikeb

length argument for some free() calls; ok doug

add a size argument to free. will be used soon, but for now default to 0.
after discussions with beck deraadt kettenis.

Uniformize drivers doing nothing with their multicast filters to make
them ignore the SIOC{ADD,DEL}MULTI ioctls.

ok reyk@, claudio@

no need for a lot of code to include proc.h

Remove various read-only *maxlen variables and use IFQ_MAXLEN directly.

ok beck@, mikeb@

use ifmedia_delete_instance() when destroying a vether
from Martin Pelikan

ugly spacing

Special-case SIOCADDMULTI and SIOCDELMULTI ioctls, based on code from if_tun.
Makes IPv6 work with if_vether.

ok deraadt

allow this to compile in the never-gonna-happen world without INET

dont maintain a list of vether devices inside the driver if they are never
looked up. can vether get any smaller?

ok deraadt@ claudio@