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