Fix race condition on the rawcb list shared by rtsock and keysock

keysock now protects itself by its own mutex, which means that
the rawcb list is protected by two different mutexes (keysock's one
and softnet_lock for rtsock), of course it's useless.

Fix the situation by having a discrete rawcb list for each.

Let PF_KEY socks hold their own lock instead of softnet_lock

Operations on SAD and SPD are executed via PF_KEY socks. The operations
include deletions of SAs and SPs that will use synchronization mechanisms
such as pserialize_perform to wait for references to SAs and SPs to be
released. It is known that using such mechanisms with holding softnet_lock
causes a dead lock. We should avoid the situation.

branches: 1.22.4;
raw_detach: rawpcb may be embedded, free using the real size (saved in rcb).

- Split off PRU_ATTACH and PRU_DETACH logic into separate functions.
- Replace malloc with kmem and eliminate M_PCB while here.
- Sprinkle more asserts.

branches: 1.20.38; 1.20.44; 1.20.54;
Remove the pcb from the rawcb list before sofree'ing it.
Don't reacquire softnet_lock until after we've freed the pcb.

branches: 1.19.2; 1.19.4; 1.19.8;
Merge the socket locking patch:

- Socket layer becomes MP safe.
- Unix protocols become MP safe.
- Allows protocol processing interrupts to safely block on locks.
- Fixes a number of race conditions.

With much feedback from matt@ and plunky@.

branches: 1.18.36; 1.18.38;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.17.26;
ANSI function decls and application of static.

merge ktrace-lwp.

branches: 1.15.4;
nuke trailing whitespace

branches: 1.14.8; 1.14.10;
Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.13.10;
Eliminate more commons.

add RCSIDs

branches: 1.11.6; 1.11.8;
Kill some more register declarations.

branches: 1.10.28;
We must indirect through the higher-level protocol for
PRU_{BIND,CONNECT} so that it can check the sockaddr.

branches: 1.9.4;
Net prototypes

Various cleanup, including:
* Convert several data structures to use queue.h.
* Split in_pcbnotify() into two parts; one for notifying a specific PCB, and
one for notifying all PCBs for a particular foreign address.

New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

Update to 4.4-Lite networking code, with a few local changes.

include <machine/cpu.h> not <machine/mtpr.h>

Canonicalize all #includes.

branches: 1.3.4;
add include of select.h if necessary for protos, or delete if extraneous

make kernel select interface be one-stop shopping & clean it all up.

branches: 1.1.1;
Initial revision

Let PF_KEY socks hold their own lock instead of softnet_lock

Operations on SAD and SPD are executed via PF_KEY socks. The operations
include deletions of SAs and SPs that will use synchronization mechanisms
such as pserialize_perform to wait for references to SAs and SPs to be
released. It is known that using such mechanisms with holding softnet_lock
causes a dead lock. We should avoid the situation.

raw_detach: rawpcb may be embedded, free using the real size (saved in rcb).

- Split off PRU_ATTACH and PRU_DETACH logic into separate functions.
- Replace malloc with kmem and eliminate M_PCB while here.
- Sprinkle more asserts.

branches: 1.20.38; 1.20.44; 1.20.54;
Remove the pcb from the rawcb list before sofree'ing it.
Don't reacquire softnet_lock until after we've freed the pcb.

branches: 1.19.2; 1.19.4; 1.19.8;
Merge the socket locking patch:

- Socket layer becomes MP safe.
- Unix protocols become MP safe.
- Allows protocol processing interrupts to safely block on locks.
- Fixes a number of race conditions.

With much feedback from matt@ and plunky@.

branches: 1.18.36; 1.18.38;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.17.26;
ANSI function decls and application of static.

merge ktrace-lwp.

branches: 1.15.4;
nuke trailing whitespace

branches: 1.14.8; 1.14.10;
Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.13.10;
Eliminate more commons.

add RCSIDs

branches: 1.11.6; 1.11.8;
Kill some more register declarations.

branches: 1.10.28;
We must indirect through the higher-level protocol for
PRU_{BIND,CONNECT} so that it can check the sockaddr.

branches: 1.9.4;
Net prototypes

Various cleanup, including:
* Convert several data structures to use queue.h.
* Split in_pcbnotify() into two parts; one for notifying a specific PCB, and
one for notifying all PCBs for a particular foreign address.

New RCS ID's, take two. they're more aesthecially pleasant, and use 'NetBSD'

Update to 4.4-Lite networking code, with a few local changes.

include <machine/cpu.h> not <machine/mtpr.h>

Canonicalize all #includes.

branches: 1.3.4;
add include of select.h if necessary for protos, or delete if extraneous

make kernel select interface be one-stop shopping & clean it all up.

branches: 1.1.1;
Initial revision