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: releng/6.2/sys/netnatm/natm_pcb.c 149077 2005-08-15 09:51:15Z rwatson $");
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
85 NATM_LOCK_ASSERT();
86
87 if ((npcb->npcb_flags & NPCB_FREE) == 0) {
88 LIST_REMOVE(npcb, pcblist);
89 npcb->npcb_flags = NPCB_FREE;
90 }
91 if (op == NPCB_DESTROY) {
92 if (npcb->npcb_inq) {
93 npcb->npcb_flags = NPCB_DRAIN; /* flag for distruct. */
94 } else {
95 FREE(npcb, M_PCB); /* kill it! */
96 }
97 }
98 }
99
100
101 /*
102 * npcb_add: add or remove npcb from main list
103 * returns npcb if ok
104 */
105 struct natmpcb *
106 npcb_add(struct natmpcb *npcb, struct ifnet *ifp, u_int16_t vci, u_int8_t vpi)
107 {
108 struct natmpcb *cpcb = NULL; /* current pcb */
109
110 NATM_LOCK_ASSERT();
111
112 /*
113 * lookup required
114 */
115 LIST_FOREACH(cpcb, &natm_pcbs, pcblist)
116 if (ifp == cpcb->npcb_ifp && vci == cpcb->npcb_vci &&
117 vpi == cpcb->npcb_vpi)
118 break;
119
120 /*
121 * add & something already there?
122 */
123 if (cpcb) {
124 cpcb = NULL;
125 goto done; /* fail */
126 }
127
128 /*
129 * need to allocate a pcb?
130 */
131 if (npcb == NULL) {
132 /* could be called from lower half */
133 cpcb = npcb_alloc(M_NOWAIT);
134 if (cpcb == NULL)
135 goto done; /* fail */
136 } else {
137 cpcb = npcb;
138 }
139
140 cpcb->npcb_ifp = ifp;
141 cpcb->ipaddr.s_addr = 0;
142 cpcb->npcb_vci = vci;
143 cpcb->npcb_vpi = vpi;
144 cpcb->npcb_flags = NPCB_CONNECTED;
145
146 LIST_INSERT_HEAD(&natm_pcbs, cpcb, pcblist);
147
148 done:
149 return (cpcb);
150 }
151
152 #ifdef DDB
153
154 int
155 npcb_dump(void)
156 {
157 struct natmpcb *cpcb;
158
159 printf("npcb dump:\n");
160 LIST_FOREACH(cpcb, &natm_pcbs, pcblist) {
161 printf("if=%s, vci=%d, vpi=%d, IP=0x%x, sock=%p, flags=0x%x, "
162 "inq=%d\n", cpcb->npcb_ifp->if_xname, cpcb->npcb_vci,
163 cpcb->npcb_vpi, cpcb->ipaddr.s_addr, cpcb->npcb_socket,
164 cpcb->npcb_flags, cpcb->npcb_inq);
165 }
166 printf("done\n");
167 return (0);
168 }
169 #endif
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