natm_pcb.c revision 116189 
1/*	$NetBSD: natm_pcb.c,v 1.4 1996/11/09 03:26:27 chuck Exp $	*/
2/*
3 *
4 * Copyright (c) 1996 Charles D. Cranor and Washington University.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *      This product includes software developed by Charles D. Cranor and
18 *      Washington University.
19 * 4. The name of the author may not be used to endorse or promote products
20 *    derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34/*
35 * atm_pcb.c: manage atm protocol control blocks and keep IP and NATM
36 * from trying to use each other's VCs.
37 */
38
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD: head/sys/netnatm/natm_pcb.c 116189 2003-06-11 05:37:42Z obrien $");
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/malloc.h>
45#include <sys/socket.h>
46#include <sys/socketvar.h>
47
48#include <net/if.h>
49
50#include <netinet/in.h>
51
52#include <netnatm/natm.h>
53
54struct npcblist natm_pcbs;
55
56/*
57 * npcb_alloc: allocate a npcb [in the free state]
58 */
59
60struct natmpcb *npcb_alloc(wait)
61
62int wait;
63
64{
65  struct natmpcb *npcb;
66
67  MALLOC(npcb, struct natmpcb *, sizeof(*npcb), M_PCB, wait | M_ZERO);
68
69#ifdef DIAGNOSTIC
70  if (wait == M_WAITOK && npcb == NULL) panic("npcb_alloc: malloc didn't wait");
71#endif
72
73  if (npcb)
74    npcb->npcb_flags = NPCB_FREE;
75
76  return(npcb);
77}
78
79
80/*
81 * npcb_free: free a npcb
82 */
83
84void npcb_free(npcb, op)
85
86struct natmpcb *npcb;
87int op;
88
89{
90  int s = splimp();
91
92  if ((npcb->npcb_flags & NPCB_FREE) == 0) {
93    LIST_REMOVE(npcb, pcblist);
94    npcb->npcb_flags = NPCB_FREE;
95  }
96  if (op == NPCB_DESTROY) {
97    if (npcb->npcb_inq) {
98      npcb->npcb_flags = NPCB_DRAIN;	/* flag for distruction */
99    } else {
100      FREE(npcb, M_PCB);		/* kill it! */
101    }
102  }
103
104  splx(s);
105}
106
107
108/*
109 * npcb_add: add or remove npcb from main list
110 *   returns npcb if ok
111 */
112
113struct natmpcb *npcb_add(npcb, ifp, vci, vpi)
114
115struct natmpcb *npcb;
116struct ifnet *ifp;
117u_int16_t vci;
118u_int8_t vpi;
119
120{
121  struct natmpcb *cpcb = NULL;		/* current pcb */
122  int s = splimp();
123
124
125  /*
126   * lookup required
127   */
128
129  for (cpcb = LIST_FIRST(&natm_pcbs) ; cpcb != NULL ;
130					cpcb = LIST_NEXT(cpcb, pcblist)) {
131    if (ifp == cpcb->npcb_ifp && vci == cpcb->npcb_vci && vpi == cpcb->npcb_vpi)
132      break;
133  }
134
135  /*
136   * add & something already there?
137   */
138
139  if (cpcb) {
140    cpcb = NULL;
141    goto done;					/* fail */
142  }
143
144  /*
145   * need to allocate a pcb?
146   */
147
148  if (npcb == NULL) {
149    cpcb = npcb_alloc(M_NOWAIT);	/* could be called from lower half */
150    if (cpcb == NULL)
151      goto done;			/* fail */
152  } else {
153    cpcb = npcb;
154  }
155
156  cpcb->npcb_ifp = ifp;
157  cpcb->ipaddr.s_addr = 0;
158  cpcb->npcb_vci = vci;
159  cpcb->npcb_vpi = vpi;
160  cpcb->npcb_flags = NPCB_CONNECTED;
161
162  LIST_INSERT_HEAD(&natm_pcbs, cpcb, pcblist);
163
164done:
165  splx(s);
166  return(cpcb);
167}
168
169
170
171#ifdef DDB
172
173int npcb_dump(void);
174
175int npcb_dump()
176
177{
178  struct natmpcb *cpcb;
179
180  printf("npcb dump:\n");
181  for (cpcb = LIST_FIRST(&natm_pcbs) ; cpcb != NULL ;
182					cpcb = LIST_NEXT(cpcb, pcblist)) {
183    printf("if=%s, vci=%d, vpi=%d, IP=0x%x, sock=%p, flags=0x%x, inq=%d\n",
184	cpcb->npcb_ifp->if_xname, cpcb->npcb_vci, cpcb->npcb_vpi,
185	cpcb->ipaddr.s_addr, cpcb->npcb_socket,
186	cpcb->npcb_flags, cpcb->npcb_inq);
187  }
188  printf("done\n");
189  return(0);
190}
191
192#endif
193