FreeBSD/Linux Kernel Cross Reference
sys/netinet/if_atm.c
1 /* $NetBSD: if_atm.c,v 1.6 1996/10/13 02:03:01 christos 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 * $FreeBSD$
35 */
36
37 /*
38 * IP <=> ATM address resolution.
39 */
40
41 #include "opt_inet.h"
42 #include "opt_inet6.h"
43 #include "opt_natm.h"
44
45 #if defined(INET) || defined(INET6)
46
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/queue.h>
50 #include <sys/mbuf.h>
51 #include <sys/socket.h>
52 #include <sys/sockio.h>
53 #include <sys/syslog.h>
54
55 #include <net/if.h>
56 #include <net/if_dl.h>
57 #include <net/route.h>
58 #include <net/if_atm.h>
59
60 #include <netinet/in.h>
61 #include <netinet/if_atm.h>
62
63 #ifdef NATM
64 #include <netnatm/natm.h>
65 #endif
66
67
68 #define SDL(s) ((struct sockaddr_dl *)s)
69
70 /*
71 * atm_rtrequest: handle ATM rt request (in support of generic code)
72 * inputs: "req" = request code
73 * "rt" = route entry
74 * "info" = rt_addrinfo
75 */
76
77 void
78 atm_rtrequest(req, rt, info)
79 int req;
80 register struct rtentry *rt;
81 struct rt_addrinfo *info;
82 {
83 register struct sockaddr *gate = rt->rt_gateway;
84 struct atm_pseudoioctl api;
85 #ifdef NATM
86 struct sockaddr_in *sin;
87 struct natmpcb *npcb = NULL;
88 struct atm_pseudohdr *aph;
89 #endif
90 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
91
92 if (rt->rt_flags & RTF_GATEWAY) /* link level requests only */
93 return;
94
95 switch (req) {
96
97 case RTM_RESOLVE: /* resolve: only happens when cloning */
98 printf("atm_rtrequest: RTM_RESOLVE request detected?\n");
99 break;
100
101 case RTM_ADD:
102
103 /*
104 * route added by a command (e.g. ifconfig, route, arp...).
105 *
106 * first check to see if this is not a host route, in which
107 * case we are being called via "ifconfig" to set the address.
108 */
109
110 if ((rt->rt_flags & RTF_HOST) == 0) {
111 rt_setgate(rt,rt_key(rt),(struct sockaddr *)&null_sdl);
112 gate = rt->rt_gateway;
113 SDL(gate)->sdl_type = rt->rt_ifp->if_type;
114 SDL(gate)->sdl_index = rt->rt_ifp->if_index;
115 break;
116 }
117
118 if ((rt->rt_flags & RTF_CLONING) != 0) {
119 printf("atm_rtrequest: cloning route detected?\n");
120 break;
121 }
122 if (gate->sa_family != AF_LINK ||
123 gate->sa_len < sizeof(null_sdl)) {
124 log(LOG_DEBUG, "atm_rtrequest: bad gateway value");
125 break;
126 }
127
128 #ifdef DIAGNOSTIC
129 if (rt->rt_ifp->if_ioctl == NULL) panic("atm null ioctl");
130 #endif
131
132 #ifdef NATM
133 /*
134 * let native ATM know we are using this VCI/VPI
135 * (i.e. reserve it)
136 */
137 sin = (struct sockaddr_in *) rt_key(rt);
138 if (sin->sin_family != AF_INET)
139 goto failed;
140 aph = (struct atm_pseudohdr *) LLADDR(SDL(gate));
141 npcb = npcb_add(NULL, rt->rt_ifp, ATM_PH_VCI(aph),
142 ATM_PH_VPI(aph));
143 if (npcb == NULL)
144 goto failed;
145 npcb->npcb_flags |= NPCB_IP;
146 npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
147 /* XXX: move npcb to llinfo when ATM ARP is ready */
148 rt->rt_llinfo = (caddr_t) npcb;
149 rt->rt_flags |= RTF_LLINFO;
150 #endif
151 /*
152 * let the lower level know this circuit is active
153 */
154 bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
155 api.rxhand = NULL;
156 if (rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMENA,
157 (caddr_t)&api) != 0) {
158 printf("atm: couldn't add VC\n");
159 goto failed;
160 }
161
162 SDL(gate)->sdl_type = rt->rt_ifp->if_type;
163 SDL(gate)->sdl_index = rt->rt_ifp->if_index;
164
165 break;
166
167 failed:
168 #ifdef NATM
169 if (npcb) {
170 npcb_free(npcb, NPCB_DESTROY);
171 rt->rt_llinfo = NULL;
172 rt->rt_flags &= ~RTF_LLINFO;
173 }
174 #endif
175 rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0,
176 rt_mask(rt), 0, (struct rtentry **) 0);
177 break;
178
179 case RTM_DELETE:
180
181 #ifdef NATM
182 /*
183 * tell native ATM we are done with this VC
184 */
185
186 if (rt->rt_flags & RTF_LLINFO) {
187 npcb_free((struct natmpcb *)rt->rt_llinfo,
188 NPCB_DESTROY);
189 rt->rt_llinfo = NULL;
190 rt->rt_flags &= ~RTF_LLINFO;
191 }
192 #endif
193 /*
194 * tell the lower layer to disable this circuit
195 */
196
197 bcopy(LLADDR(SDL(gate)), &api.aph, sizeof(api.aph));
198 api.rxhand = NULL;
199 (void)rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMDIS,
200 (caddr_t)&api);
201
202 break;
203 }
204 }
205
206 /*
207 * atmresolve:
208 * inputs:
209 * [1] "rt" = the link level route to use (or null if need to look one up)
210 * [2] "m" = mbuf containing the data to be sent
211 * [3] "dst" = sockaddr_in (IP) address of dest.
212 * output:
213 * [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
214 * return:
215 * 0 == resolve FAILED; note that "m" gets m_freem'd in this case
216 * 1 == resolve OK; desten contains result
217 *
218 * XXX: will need more work if we wish to support ATMARP in the kernel,
219 * but this is enough for PVCs entered via the "route" command.
220 */
221
222 int
223 atmresolve(rt, m, dst, desten)
224
225 register struct rtentry *rt;
226 struct mbuf *m;
227 register struct sockaddr *dst;
228 register struct atm_pseudohdr *desten; /* OUT */
229
230 {
231 struct sockaddr_dl *sdl;
232
233 if (m->m_flags & (M_BCAST|M_MCAST)) {
234 log(LOG_INFO, "atmresolve: BCAST/MCAST packet detected/dumped");
235 goto bad;
236 }
237
238 if (rt == NULL) {
239 rt = RTALLOC1(dst, 0);
240 if (rt == NULL) goto bad; /* failed */
241 rt->rt_refcnt--; /* don't keep LL references */
242 if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
243 (rt->rt_flags & RTF_LLINFO) == 0 ||
244 /* XXX: are we using LLINFO? */
245 rt->rt_gateway->sa_family != AF_LINK) {
246 goto bad;
247 }
248 }
249
250 /*
251 * note that rt_gateway is a sockaddr_dl which contains the
252 * atm_pseudohdr data structure for this route. we currently
253 * don't need any rt_llinfo info (but will if we want to support
254 * ATM ARP [c.f. if_ether.c]).
255 */
256
257 sdl = SDL(rt->rt_gateway);
258
259 /*
260 * Check the address family and length is valid, the address
261 * is resolved; otherwise, try to resolve.
262 */
263
264
265 if (sdl->sdl_family == AF_LINK && sdl->sdl_alen == sizeof(*desten)) {
266 bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
267 return(1); /* ok, go for it! */
268 }
269
270 /*
271 * we got an entry, but it doesn't have valid link address
272 * info in it (it is prob. the interface route, which has
273 * sdl_alen == 0). dump packet. (fall through to "bad").
274 */
275
276 bad:
277 m_freem(m);
278 return(0);
279 }
280 #endif /* INET */
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