Annotation of sys/netnatm/natm_pcb.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: natm_pcb.c,v 1.7 2006/03/05 21:48:57 miod Exp $ */
! 2:
! 3: /*
! 4: *
! 5: * Copyright (c) 1996 Charles D. Cranor and Washington University.
! 6: * All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. All advertising materials mentioning features or use of this software
! 17: * must display the following acknowledgement:
! 18: * This product includes software developed by Charles D. Cranor and
! 19: * Washington University.
! 20: * 4. The name of the author may not be used to endorse or promote products
! 21: * derived from this software without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 24: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 25: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 26: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 27: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 28: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 29: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 30: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 31: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 32: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 33: */
! 34:
! 35: /*
! 36: * atm_pcb.c: manage atm protocol control blocks and keep IP and NATM
! 37: * from trying to use each other's VCs.
! 38: */
! 39:
! 40: #include <sys/param.h>
! 41: #include <sys/systm.h>
! 42: #include <sys/queue.h>
! 43: #include <sys/socket.h>
! 44: #include <sys/protosw.h>
! 45: #include <sys/domain.h>
! 46: #include <sys/mbuf.h>
! 47: #include <sys/malloc.h>
! 48:
! 49: #include <net/if.h>
! 50: #include <net/radix.h>
! 51: #include <net/route.h>
! 52:
! 53: #include <netinet/in.h>
! 54:
! 55: #include <netnatm/natm.h>
! 56:
! 57: /*
! 58: * npcb_alloc: allocate a npcb [in the free state]
! 59: */
! 60:
! 61: struct natmpcb *npcb_alloc(wait)
! 62:
! 63: int wait;
! 64:
! 65: {
! 66: struct natmpcb *npcb;
! 67:
! 68: MALLOC(npcb, struct natmpcb *, sizeof(*npcb), M_PCB, wait);
! 69:
! 70: if (npcb) {
! 71: bzero(npcb, sizeof(*npcb));
! 72: npcb->npcb_flags = NPCB_FREE;
! 73: }
! 74: return(npcb);
! 75: }
! 76:
! 77:
! 78: /*
! 79: * npcb_free: free a npcb
! 80: */
! 81:
! 82: void npcb_free(npcb, op)
! 83:
! 84: struct natmpcb *npcb;
! 85: int op;
! 86:
! 87: {
! 88: int s = splnet();
! 89:
! 90: if ((npcb->npcb_flags & NPCB_FREE) == 0) {
! 91: LIST_REMOVE(npcb, pcblist);
! 92: npcb->npcb_flags = NPCB_FREE;
! 93: }
! 94: if (op == NPCB_DESTROY) {
! 95: if (npcb->npcb_inq) {
! 96: npcb->npcb_flags = NPCB_DRAIN; /* flag for distruction */
! 97: } else {
! 98: FREE(npcb, M_PCB); /* kill it! */
! 99: }
! 100: }
! 101:
! 102: splx(s);
! 103: }
! 104:
! 105:
! 106: /*
! 107: * npcb_add: add or remove npcb from main list
! 108: * returns npcb if ok
! 109: */
! 110:
! 111: struct natmpcb *npcb_add(npcb, ifp, vci, vpi)
! 112:
! 113: struct natmpcb *npcb;
! 114: struct ifnet *ifp;
! 115: u_int16_t vci;
! 116: u_int8_t vpi;
! 117:
! 118: {
! 119: struct natmpcb *cpcb = NULL; /* current pcb */
! 120: int s = splnet();
! 121:
! 122:
! 123: /*
! 124: * lookup required
! 125: */
! 126:
! 127: LIST_FOREACH(cpcb, &natm_pcbs, pcblist) {
! 128: if (ifp == cpcb->npcb_ifp && vci == cpcb->npcb_vci && vpi == cpcb->npcb_vpi)
! 129: break;
! 130: }
! 131:
! 132: /*
! 133: * add & something already there?
! 134: */
! 135:
! 136: if (cpcb) {
! 137: cpcb = NULL;
! 138: goto done; /* fail */
! 139: }
! 140:
! 141: /*
! 142: * need to allocate a pcb?
! 143: */
! 144:
! 145: if (npcb == NULL) {
! 146: cpcb = npcb_alloc(M_NOWAIT); /* could be called from lower half */
! 147: if (cpcb == NULL)
! 148: goto done; /* fail */
! 149: } else {
! 150: cpcb = npcb;
! 151: }
! 152:
! 153: cpcb->npcb_ifp = ifp;
! 154: cpcb->ipaddr.s_addr = 0;
! 155: cpcb->npcb_vci = vci;
! 156: cpcb->npcb_vpi = vpi;
! 157: cpcb->npcb_flags = NPCB_CONNECTED;
! 158:
! 159: LIST_INSERT_HEAD(&natm_pcbs, cpcb, pcblist);
! 160:
! 161: done:
! 162: splx(s);
! 163: return(cpcb);
! 164: }
! 165:
! 166:
! 167:
! 168: #ifdef DDB
! 169:
! 170: int npcb_dump(void);
! 171:
! 172: int npcb_dump()
! 173:
! 174: {
! 175: struct natmpcb *cpcb;
! 176:
! 177: printf("npcb dump:\n");
! 178: LIST_FOREACH(cpcb, &natm_pcbs, pcblist) {
! 179: printf("if=%s, vci=%d, vpi=%d, IP=0x%x, sock=%p, flags=0x%x, inq=%d\n",
! 180: cpcb->npcb_ifp->if_xname, cpcb->npcb_vci, cpcb->npcb_vpi,
! 181: cpcb->ipaddr.s_addr, cpcb->npcb_socket,
! 182: cpcb->npcb_flags, cpcb->npcb_inq);
! 183: }
! 184: printf("done\n");
! 185: return(0);
! 186: }
! 187:
! 188: #endif
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