64-bit changes: casts, and ioctl cmds are u_longs

When the line discipline is changed from term to slip,
ttyclose() is called and then slopen(). This leaves t_state
cleared. Set TS_ISOPEN and TS_XCLUDE so further opens on /dev/xxx
see that the devic

When the line discipline is changed from term to slip,
ttyclose() is called and then slopen(). This leaves t_state
cleared. Set TS_ISOPEN and TS_XCLUDE so further opens on /dev/xxx
see that the device is still being used by the slip process (from ralph)

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delete redundant declaration of time (from cgd)

get SLIP ioctl and BPF info from <net/slip.h>

lint

add BPF support. compress all packets. stabilize error-prone lines.

lint

changes for 4.4BSD-Lite requested by USL

4.4BSD snapshot (revision 8.1); add 1993 to copyright

prototype everything

MULTICAST is now standard

make kernel includes standard

multicast changes from lbl

init if_next to NULL

set ip before we use it; gcc lint

checked in for torek by sklower; Mike agrees to all these changes

remove compat crap, other cleanups; remove old port-number peek
for fast queue (use IP TOS instead)

check in temporary version with compatibility hacks

added link level control bits so we can pass mode info to a given
link layer protocol. for example, to enable slip compression.

new proc, user; rm user.h; remove TIOCGETD hack returning unit

new copyright notice

drop unnecessary include of dir.h (checked in by sklower)

update from van: add "auto enable" of compression (if auto
enable flag is set on if and a compressed packet is received, then
enable compression on output); also separates i/o mru/mtu

put in SNMP changes

minor cleanups