1 /* $NetBSD: natm_pcb.c,v 1.4 1996/11/09 03:26:27 chuck 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/malloc.h>
43 #include <sys/socket.h>
44 #include <sys/socketvar.h>
45
46 #include <net/if.h>
47
48 #include <netinet/in.h>
49
50 #include <netnatm/natm.h>
51
52 struct npcblist natm_pcbs;
53
54 /*
55 * npcb_alloc: allocate a npcb [in the free state]
56 */
57
58 struct natmpcb *npcb_alloc(wait)
59
60 int wait;
61
62 {
63 struct natmpcb *npcb;
64
65 MALLOC(npcb, struct natmpcb *, sizeof(*npcb), M_PCB, wait);
66
67 #ifdef DIAGNOSTIC
68 if (wait == M_WAITOK && npcb == NULL) panic("npcb_alloc: malloc didn't wait");
69 #endif
70
71 if (npcb) {
72 bzero(npcb, sizeof(*npcb));
73 npcb->npcb_flags = NPCB_FREE;
74 }
75 return(npcb);
76 }
77
78
79 /*
80 * npcb_free: free a npcb
81 */
82
83 void npcb_free(npcb, op)
84
85 struct natmpcb *npcb;
86 int op;
87
88 {
89 int s = splimp();
90
91 if ((npcb->npcb_flags & NPCB_FREE) == 0) {
92 LIST_REMOVE(npcb, pcblist);
93 npcb->npcb_flags = NPCB_FREE;
94 }
95 if (op == NPCB_DESTROY) {
96 if (npcb->npcb_inq) {
97 npcb->npcb_flags = NPCB_DRAIN; /* flag for distruction */
98 } else {
99 FREE(npcb, M_PCB); /* kill it! */
100 }
101 }
102
103 splx(s);
104 }
105
106
107 /*
108 * npcb_add: add or remove npcb from main list
109 * returns npcb if ok
110 */
111
112 struct natmpcb *npcb_add(npcb, ifp, vci, vpi)
113
114 struct natmpcb *npcb;
115 struct ifnet *ifp;
116 u_int16_t vci;
117 u_int8_t vpi;
118
119 {
120 struct natmpcb *cpcb = NULL; /* current pcb */
121 int s = splimp();
122
123
124 /*
125 * lookup required
126 */
127
128 for (cpcb = natm_pcbs.lh_first ; cpcb != NULL ;
129 cpcb = cpcb->pcblist.le_next) {
130 if (ifp == cpcb->npcb_ifp && vci == cpcb->npcb_vci && vpi == cpcb->npcb_vpi)
131 break;
132 }
133
134 /*
135 * add & something already there?
136 */
137
138 if (cpcb) {
139 cpcb = NULL;
140 goto done; /* fail */
141 }
142
143 /*
144 * need to allocate a pcb?
145 */
146
147 if (npcb == NULL) {
148 cpcb = npcb_alloc(M_NOWAIT); /* could be called from lower half */
149 if (cpcb == NULL)
150 goto done; /* fail */
151 } else {
152 cpcb = npcb;
153 }
154
155 cpcb->npcb_ifp = ifp;
156 cpcb->ipaddr.s_addr = 0;
157 cpcb->npcb_vci = vci;
158 cpcb->npcb_vpi = vpi;
159 cpcb->npcb_flags = NPCB_CONNECTED;
160
161 LIST_INSERT_HEAD(&natm_pcbs, cpcb, pcblist);
162
163 done:
164 splx(s);
165 return(cpcb);
166 }
167
168
169
170 #ifdef DDB
171
172 int npcb_dump __P((void));
173
174 int npcb_dump()
175
176 {
177 struct natmpcb *cpcb;
178
179 printf("npcb dump:\n");
180 for (cpcb = natm_pcbs.lh_first ; cpcb != NULL ;
181 cpcb = cpcb->pcblist.le_next) {
182 printf("if=%s, vci=%d, vpi=%d, IP=0x%x, sock=%p, flags=0x%x, inq=%d\n",
183 cpcb->npcb_ifp->if_xname, cpcb->npcb_vci, cpcb->npcb_vpi,
184 cpcb->ipaddr.s_addr, cpcb->npcb_socket,
185 cpcb->npcb_flags, cpcb->npcb_inq);
186 }
187 printf("done\n");
188 return(0);
189 }
190
191 #endif
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