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("$FreeBSD$");
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
54 struct npcblist natm_pcbs;
55
56 /*
57 * npcb_alloc: allocate a npcb [in the free state]
58 */
59 struct natmpcb *
60 npcb_alloc(int wait)
61
62 {
63 struct natmpcb *npcb;
64
65 npcb = malloc(sizeof(*npcb), M_PCB, wait | M_ZERO);
66
67 #ifdef DIAGNOSTIC
68 if (wait == M_WAITOK && npcb == NULL)
69 panic("npcb_alloc: malloc didn't wait");
70 #endif
71
72 if (npcb != NULL)
73 npcb->npcb_flags = NPCB_FREE;
74 return (npcb);
75 }
76
77
78 /*
79 * npcb_free: free a npcb
80 */
81 void
82 npcb_free(struct natmpcb *npcb, int op)
83 {
84 int s = splimp();
85
86 if ((npcb->npcb_flags & NPCB_FREE) == 0) {
87 LIST_REMOVE(npcb, pcblist);
88 npcb->npcb_flags = NPCB_FREE;
89 }
90 if (op == NPCB_DESTROY) {
91 if (npcb->npcb_inq) {
92 npcb->npcb_flags = NPCB_DRAIN; /* flag for distruct. */
93 } else {
94 FREE(npcb, M_PCB); /* kill it! */
95 }
96 }
97
98 splx(s);
99 }
100
101
102 /*
103 * npcb_add: add or remove npcb from main list
104 * returns npcb if ok
105 */
106 struct natmpcb *
107 npcb_add(struct natmpcb *npcb, struct ifnet *ifp, u_int16_t vci, u_int8_t vpi)
108 {
109 struct natmpcb *cpcb = NULL; /* current pcb */
110 int s = splimp();
111
112
113 /*
114 * lookup required
115 */
116 LIST_FOREACH(cpcb, &natm_pcbs, pcblist)
117 if (ifp == cpcb->npcb_ifp && vci == cpcb->npcb_vci &&
118 vpi == cpcb->npcb_vpi)
119 break;
120
121 /*
122 * add & something already there?
123 */
124 if (cpcb) {
125 cpcb = NULL;
126 goto done; /* fail */
127 }
128
129 /*
130 * need to allocate a pcb?
131 */
132 if (npcb == NULL) {
133 /* could be called from lower half */
134 cpcb = npcb_alloc(M_NOWAIT);
135 if (cpcb == NULL)
136 goto done; /* fail */
137 } else {
138 cpcb = npcb;
139 }
140
141 cpcb->npcb_ifp = ifp;
142 cpcb->ipaddr.s_addr = 0;
143 cpcb->npcb_vci = vci;
144 cpcb->npcb_vpi = vpi;
145 cpcb->npcb_flags = NPCB_CONNECTED;
146
147 LIST_INSERT_HEAD(&natm_pcbs, cpcb, pcblist);
148
149 done:
150 splx(s);
151 return (cpcb);
152 }
153
154 #ifdef DDB
155
156 int
157 npcb_dump(void)
158 {
159 struct natmpcb *cpcb;
160
161 printf("npcb dump:\n");
162 LIST_FOREACH(cpcb, &natm_pcbs, pcblist) {
163 printf("if=%s, vci=%d, vpi=%d, IP=0x%x, sock=%p, flags=0x%x, "
164 "inq=%d\n", cpcb->npcb_ifp->if_xname, cpcb->npcb_vci,
165 cpcb->npcb_vpi, cpcb->ipaddr.s_addr, cpcb->npcb_socket,
166 cpcb->npcb_flags, cpcb->npcb_inq);
167 }
168 printf("done\n");
169 return (0);
170 }
171 #endif
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