Annotation of sys/netnatm/natm_pcb.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: natm_pcb.c,v 1.7 2006/03/05 21:48:57 miod 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/queue.h>
43: #include <sys/socket.h>
44: #include <sys/protosw.h>
45: #include <sys/domain.h>
46: #include <sys/mbuf.h>
47: #include <sys/malloc.h>
48:
49: #include <net/if.h>
50: #include <net/radix.h>
51: #include <net/route.h>
52:
53: #include <netinet/in.h>
54:
55: #include <netnatm/natm.h>
56:
57: /*
58: * npcb_alloc: allocate a npcb [in the free state]
59: */
60:
61: struct natmpcb *npcb_alloc(wait)
62:
63: int wait;
64:
65: {
66: struct natmpcb *npcb;
67:
68: MALLOC(npcb, struct natmpcb *, sizeof(*npcb), M_PCB, wait);
69:
70: if (npcb) {
71: bzero(npcb, sizeof(*npcb));
72: npcb->npcb_flags = NPCB_FREE;
73: }
74: return(npcb);
75: }
76:
77:
78: /*
79: * npcb_free: free a npcb
80: */
81:
82: void npcb_free(npcb, op)
83:
84: struct natmpcb *npcb;
85: int op;
86:
87: {
88: int s = splnet();
89:
90: if ((npcb->npcb_flags & NPCB_FREE) == 0) {
91: LIST_REMOVE(npcb, pcblist);
92: npcb->npcb_flags = NPCB_FREE;
93: }
94: if (op == NPCB_DESTROY) {
95: if (npcb->npcb_inq) {
96: npcb->npcb_flags = NPCB_DRAIN; /* flag for distruction */
97: } else {
98: FREE(npcb, M_PCB); /* kill it! */
99: }
100: }
101:
102: splx(s);
103: }
104:
105:
106: /*
107: * npcb_add: add or remove npcb from main list
108: * returns npcb if ok
109: */
110:
111: struct natmpcb *npcb_add(npcb, ifp, vci, vpi)
112:
113: struct natmpcb *npcb;
114: struct ifnet *ifp;
115: u_int16_t vci;
116: u_int8_t vpi;
117:
118: {
119: struct natmpcb *cpcb = NULL; /* current pcb */
120: int s = splnet();
121:
122:
123: /*
124: * lookup required
125: */
126:
127: LIST_FOREACH(cpcb, &natm_pcbs, pcblist) {
128: if (ifp == cpcb->npcb_ifp && vci == cpcb->npcb_vci && vpi == cpcb->npcb_vpi)
129: break;
130: }
131:
132: /*
133: * add & something already there?
134: */
135:
136: if (cpcb) {
137: cpcb = NULL;
138: goto done; /* fail */
139: }
140:
141: /*
142: * need to allocate a pcb?
143: */
144:
145: if (npcb == NULL) {
146: cpcb = npcb_alloc(M_NOWAIT); /* could be called from lower half */
147: if (cpcb == NULL)
148: goto done; /* fail */
149: } else {
150: cpcb = npcb;
151: }
152:
153: cpcb->npcb_ifp = ifp;
154: cpcb->ipaddr.s_addr = 0;
155: cpcb->npcb_vci = vci;
156: cpcb->npcb_vpi = vpi;
157: cpcb->npcb_flags = NPCB_CONNECTED;
158:
159: LIST_INSERT_HEAD(&natm_pcbs, cpcb, pcblist);
160:
161: done:
162: splx(s);
163: return(cpcb);
164: }
165:
166:
167:
168: #ifdef DDB
169:
170: int npcb_dump(void);
171:
172: int npcb_dump()
173:
174: {
175: struct natmpcb *cpcb;
176:
177: printf("npcb dump:\n");
178: LIST_FOREACH(cpcb, &natm_pcbs, pcblist) {
179: printf("if=%s, vci=%d, vpi=%d, IP=0x%x, sock=%p, flags=0x%x, inq=%d\n",
180: cpcb->npcb_ifp->if_xname, cpcb->npcb_vci, cpcb->npcb_vpi,
181: cpcb->ipaddr.s_addr, cpcb->npcb_socket,
182: cpcb->npcb_flags, cpcb->npcb_inq);
183: }
184: printf("done\n");
185: return(0);
186: }
187:
188: #endif
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