e11e852d54
- Introduce a subsystem mutex, natm_mtx, manipulated with accessor macros
NATM_LOCK_INIT(), NATM_LOCK(), NATM_UNLOCK(), NATM_LOCK_ASSERT(). It
protects the consistency of pcb-related data structures. Finer grained
locking is possible, but should be done in the context of specific
measurements (as very little work is done in netnatm -- most is in the
ATM device driver or socket layer, so there's probably not much
contention).
- Remove GIANT_REQUIRED, mark as NETISR_MPSAFE, remove
NET_NEEDS_GIANT("netnatm").
- Conditionally acquire Giant when entering network interfaces for
ifp->if_ioctl() using IFF_LOCKGIANT(ifp)/IFF_UNLOCKGIANT(ifp) in order
to coexist with non-MPSAFE atm ifnet drivers..
- De-spl.
MFC after: 2 weeks
Reviewed by: harti, bms (various versions)
170 lines
4.2 KiB
C
170 lines
4.2 KiB
C
/* $NetBSD: natm_pcb.c,v 1.4 1996/11/09 03:26:27 chuck Exp $ */
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/*-
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*
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* Copyright (c) 1996 Charles D. Cranor and Washington University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Charles D. Cranor and
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* Washington University.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* atm_pcb.c: manage atm protocol control blocks and keep IP and NATM
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* from trying to use each other's VCs.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netnatm/natm.h>
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struct npcblist natm_pcbs;
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/*
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* npcb_alloc: allocate a npcb [in the free state]
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*/
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struct natmpcb *
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npcb_alloc(int wait)
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{
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struct natmpcb *npcb;
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npcb = malloc(sizeof(*npcb), M_PCB, wait | M_ZERO);
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#ifdef DIAGNOSTIC
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if (wait == M_WAITOK && npcb == NULL)
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panic("npcb_alloc: malloc didn't wait");
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#endif
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if (npcb != NULL)
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npcb->npcb_flags = NPCB_FREE;
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return (npcb);
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}
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/*
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* npcb_free: free a npcb
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*/
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void
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npcb_free(struct natmpcb *npcb, int op)
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{
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NATM_LOCK_ASSERT();
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if ((npcb->npcb_flags & NPCB_FREE) == 0) {
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LIST_REMOVE(npcb, pcblist);
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npcb->npcb_flags = NPCB_FREE;
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}
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if (op == NPCB_DESTROY) {
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if (npcb->npcb_inq) {
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npcb->npcb_flags = NPCB_DRAIN; /* flag for distruct. */
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} else {
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FREE(npcb, M_PCB); /* kill it! */
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}
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}
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}
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/*
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* npcb_add: add or remove npcb from main list
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* returns npcb if ok
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*/
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struct natmpcb *
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npcb_add(struct natmpcb *npcb, struct ifnet *ifp, u_int16_t vci, u_int8_t vpi)
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{
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struct natmpcb *cpcb = NULL; /* current pcb */
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NATM_LOCK_ASSERT();
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/*
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* lookup required
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*/
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LIST_FOREACH(cpcb, &natm_pcbs, pcblist)
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if (ifp == cpcb->npcb_ifp && vci == cpcb->npcb_vci &&
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vpi == cpcb->npcb_vpi)
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break;
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/*
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* add & something already there?
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*/
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if (cpcb) {
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cpcb = NULL;
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goto done; /* fail */
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}
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/*
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* need to allocate a pcb?
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*/
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if (npcb == NULL) {
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/* could be called from lower half */
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cpcb = npcb_alloc(M_NOWAIT);
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if (cpcb == NULL)
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goto done; /* fail */
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} else {
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cpcb = npcb;
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}
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cpcb->npcb_ifp = ifp;
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cpcb->ipaddr.s_addr = 0;
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cpcb->npcb_vci = vci;
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cpcb->npcb_vpi = vpi;
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cpcb->npcb_flags = NPCB_CONNECTED;
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LIST_INSERT_HEAD(&natm_pcbs, cpcb, pcblist);
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done:
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return (cpcb);
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}
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#ifdef DDB
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int
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npcb_dump(void)
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{
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struct natmpcb *cpcb;
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printf("npcb dump:\n");
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LIST_FOREACH(cpcb, &natm_pcbs, pcblist) {
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printf("if=%s, vci=%d, vpi=%d, IP=0x%x, sock=%p, flags=0x%x, "
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"inq=%d\n", cpcb->npcb_ifp->if_xname, cpcb->npcb_vci,
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cpcb->npcb_vpi, cpcb->ipaddr.s_addr, cpcb->npcb_socket,
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cpcb->npcb_flags, cpcb->npcb_inq);
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}
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printf("done\n");
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return (0);
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}
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#endif
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