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/lock.h>
47 #include <sys/malloc.h>
48 #include <sys/mutex.h>
49 #include <sys/systm.h>
50 #include <sys/socket.h>
51 #include <sys/socketvar.h>
52
53 #include <net/if.h>
54 #include <net/if_var.h> /* XXX: db_show_natm() */
55
56 #include <netinet/in.h>
57
58 #include <netnatm/natm.h>
59
60 #include <ddb/ddb.h>
61
62 struct npcblist natm_pcbs;
63
64 /*
65 * npcb_alloc: allocate a npcb [in the free state]
66 */
67 struct natmpcb *
npcb_alloc(int wait)68 npcb_alloc(int wait)
69
70 {
71 struct natmpcb *npcb;
72
73 npcb = malloc(sizeof(*npcb), M_PCB, wait | M_ZERO);
74 if (npcb != NULL)
75 npcb->npcb_flags = NPCB_FREE;
76 return (npcb);
77 }
78
79
80 /*
81 * npcb_free: free a npcb
82 */
83 void
npcb_free(struct natmpcb * npcb,int op)84 npcb_free(struct natmpcb *npcb, int op)
85 {
86
87 NATM_LOCK_ASSERT();
88
89 if ((npcb->npcb_flags & NPCB_FREE) == 0) {
90 LIST_REMOVE(npcb, pcblist);
91 npcb->npcb_flags = NPCB_FREE;
92 }
93 if (op == NPCB_DESTROY) {
94 if (npcb->npcb_inq) {
95 npcb->npcb_flags = NPCB_DRAIN; /* flag for distruct. */
96 } else {
97 free(npcb, M_PCB); /* kill it! */
98 }
99 }
100 }
101
102
103 /*
104 * npcb_add: add or remove npcb from main list
105 * returns npcb if ok
106 */
107 struct natmpcb *
npcb_add(struct natmpcb * npcb,struct ifnet * ifp,u_int16_t vci,u_int8_t vpi)108 npcb_add(struct natmpcb *npcb, struct ifnet *ifp, u_int16_t vci, u_int8_t vpi)
109 {
110 struct natmpcb *cpcb = NULL; /* current pcb */
111
112 NATM_LOCK_ASSERT();
113
114 /*
115 * lookup required
116 */
117 LIST_FOREACH(cpcb, &natm_pcbs, pcblist)
118 if (ifp == cpcb->npcb_ifp && vci == cpcb->npcb_vci &&
119 vpi == cpcb->npcb_vpi)
120 break;
121
122 /*
123 * add & something already there?
124 */
125 if (cpcb) {
126 cpcb = NULL;
127 goto done; /* fail */
128 }
129
130 /*
131 * need to allocate a pcb?
132 */
133 if (npcb == NULL) {
134 /* could be called from lower half */
135 cpcb = npcb_alloc(M_NOWAIT);
136 if (cpcb == NULL)
137 goto done; /* fail */
138 } else {
139 cpcb = npcb;
140 }
141
142 cpcb->npcb_ifp = ifp;
143 cpcb->ipaddr.s_addr = 0;
144 cpcb->npcb_vci = vci;
145 cpcb->npcb_vpi = vpi;
146 cpcb->npcb_flags = NPCB_CONNECTED;
147
148 LIST_INSERT_HEAD(&natm_pcbs, cpcb, pcblist);
149
150 done:
151 return (cpcb);
152 }
153
154 #ifdef DDB
DB_SHOW_COMMAND(natm,db_show_natm)155 DB_SHOW_COMMAND(natm, db_show_natm)
156 {
157 struct natmpcb *cpcb;
158
159 db_printf("npcb dump:\n");
160 LIST_FOREACH(cpcb, &natm_pcbs, pcblist) {
161 db_printf("if=%s, vci=%d, vpi=%d, IP=0x%x, sock=%p, "
162 "flags=0x%x, inq=%d\n", cpcb->npcb_ifp->if_xname,
163 cpcb->npcb_vci, cpcb->npcb_vpi, cpcb->ipaddr.s_addr,
164 cpcb->npcb_socket, cpcb->npcb_flags, cpcb->npcb_inq);
165 }
166 }
167 #endif
168