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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 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
36
37 /*
38  * IP <=> ATM address resolution.
39  */
40 #include "opt_inet.h"
41 #include "opt_inet6.h"
42 #include "opt_natm.h"
43
44 #if defined(INET) || defined(INET6)
45
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/queue.h>
49 #include <sys/mbuf.h>
50 #include <sys/socket.h>
51 #include <sys/sockio.h>
52 #include <sys/syslog.h>
53
54 #include <net/if.h>
55 #include <net/if_dl.h>
56 #include <net/route.h>
57 #include <net/if_atm.h>
58
59 #include <netinet/in.h>
60 #include <netinet/if_atm.h>
61
62 #ifdef NATM
63 #include <netnatm/natm.h>
64 #endif
65
66 #define SDL(s) ((struct sockaddr_dl *)s)
67
68 #define GET3BYTE(V, A, L)       do {                            \
69         (V) = ((A)[0] << 16) | ((A)[1] << 8) | (A)[2];          \
70         (A) += 3;                                               \
71         (L) -= 3;                                               \
72     } while (0)
73
74 #define GET2BYTE(V, A, L)       do {                            \
75         (V) = ((A)[0] << 8) | (A)[1];                           \
76         (A) += 2;                                               \
77         (L) -= 2;                                               \
78     } while (0)
79
80 #define GET1BYTE(V, A, L)       do {                            \
81         (V) = *(A)++;                                           \
82         (L)--;                                                  \
83     } while (0)
84
85
86 /*
87  * atm_rtrequest: handle ATM rt request (in support of generic code)
88  *   inputs: "req" = request code
89  *           "rt" = route entry
90  *           "info" = rt_addrinfo
91  */
92 void
93 atm_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info)
94 {
95         struct sockaddr *gate = rt->rt_gateway;
96         struct atmio_openvcc op;
97         struct atmio_closevcc cl;
98         u_char *addr;
99         u_int alen;
100 #ifdef NATM
101         struct sockaddr_in *sin;
102         struct natmpcb *npcb = NULL;
103 #endif
104         static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
105
106         if (rt->rt_flags & RTF_GATEWAY)   /* link level requests only */
107                 return;
108
109         switch (req) {
110
111         case RTM_RESOLVE: /* resolve: only happens when cloning */
112                 printf("atm_rtrequest: RTM_RESOLVE request detected?\n");
113                 break;
114
115         case RTM_ADD:
116                 /*
117                  * route added by a command (e.g. ifconfig, route, arp...).
118                  *
119                  * first check to see if this is not a host route, in which
120                  * case we are being called via "ifconfig" to set the address.
121                  */
122                 if ((rt->rt_flags & RTF_HOST) == 0) {
123                         rt_setgate(rt,rt_key(rt),(struct sockaddr *)&null_sdl);
124                         gate = rt->rt_gateway;
125                         SDL(gate)->sdl_type = rt->rt_ifp->if_type;
126                         SDL(gate)->sdl_index = rt->rt_ifp->if_index;
127                         break;
128                 }
129
130                 if (gate->sa_family != AF_LINK ||
131                     gate->sa_len < sizeof(null_sdl)) {
132                         log(LOG_DEBUG, "atm_rtrequest: bad gateway value");
133                         break;
134                 }
135
136                 KASSERT(rt->rt_ifp->if_ioctl != NULL,
137                     ("atm_rtrequest: null ioctl"));
138
139                 /*
140                  * Parse and verify the link level address as
141                  * an open request
142                  */
143 #ifdef NATM
144                 NATM_LOCK();
145 #endif
146                 bzero(&op, sizeof(op));
147                 addr = LLADDR(SDL(gate));
148                 alen = SDL(gate)->sdl_alen;
149                 if (alen < 4) {
150                         printf("%s: bad link-level address\n", __func__);
151                         goto failed;
152                 }
153
154                 if (alen == 4) {
155                         /* old type address */
156                         GET1BYTE(op.param.flags, addr, alen);
157                         GET1BYTE(op.param.vpi, addr, alen);
158                         GET2BYTE(op.param.vci, addr, alen);
159                         op.param.traffic = ATMIO_TRAFFIC_UBR;
160                         op.param.aal = (op.param.flags & ATM_PH_AAL5) ?
161                             ATMIO_AAL_5 : ATMIO_AAL_0;
162                 } else {
163                         /* new address */
164                         op.param.aal = ATMIO_AAL_5;
165
166                         GET1BYTE(op.param.flags, addr, alen);
167                         op.param.flags &= ATM_PH_LLCSNAP;
168
169                         GET1BYTE(op.param.vpi, addr, alen);
170                         GET2BYTE(op.param.vci, addr, alen);
171
172                         GET1BYTE(op.param.traffic, addr, alen);
173
174                         switch (op.param.traffic) {
175
176                           case ATMIO_TRAFFIC_UBR:
177                                 if (alen >= 3)
178                                         GET3BYTE(op.param.tparam.pcr,
179                                             addr, alen);
180                                 break;
181
182                           case ATMIO_TRAFFIC_CBR:
183                                 if (alen < 3)
184                                         goto bad_param;
185                                 GET3BYTE(op.param.tparam.pcr, addr, alen);
186                                 break;
187
188                           case ATMIO_TRAFFIC_VBR:
189                                 if (alen < 3 * 3)
190                                         goto bad_param;
191                                 GET3BYTE(op.param.tparam.pcr, addr, alen);
192                                 GET3BYTE(op.param.tparam.scr, addr, alen);
193                                 GET3BYTE(op.param.tparam.mbs, addr, alen);
194                                 break;
195
196                           case ATMIO_TRAFFIC_ABR:
197                                 if (alen < 4 * 3 + 2 + 1 * 2 + 3)
198                                         goto bad_param;
199                                 GET3BYTE(op.param.tparam.pcr, addr, alen);
200                                 GET3BYTE(op.param.tparam.mcr, addr, alen);
201                                 GET3BYTE(op.param.tparam.icr, addr, alen);
202                                 GET3BYTE(op.param.tparam.tbe, addr, alen);
203                                 GET1BYTE(op.param.tparam.nrm, addr, alen);
204                                 GET1BYTE(op.param.tparam.trm, addr, alen);
205                                 GET2BYTE(op.param.tparam.adtf, addr, alen);
206                                 GET1BYTE(op.param.tparam.rif, addr, alen);
207                                 GET1BYTE(op.param.tparam.rdf, addr, alen);
208                                 GET1BYTE(op.param.tparam.cdf, addr, alen);
209                                 break;
210
211                           default:
212                           bad_param:
213                                 printf("%s: bad traffic params\n", __func__);
214                                 goto failed;
215                         }
216                 }
217                 op.param.rmtu = op.param.tmtu = rt->rt_ifp->if_mtu;
218 #ifdef NATM
219                 /*
220                  * let native ATM know we are using this VCI/VPI
221                  * (i.e. reserve it)
222                  */
223                 sin = (struct sockaddr_in *) rt_key(rt);
224                 if (sin->sin_family != AF_INET)
225                         goto failed;
226                 npcb = npcb_add(NULL, rt->rt_ifp, op.param.vci,  op.param.vpi);
227                 if (npcb == NULL)
228                         goto failed;
229                 npcb->npcb_flags |= NPCB_IP;
230                 npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
231                 /* XXX: move npcb to llinfo when ATM ARP is ready */
232 #ifdef __notyet_restored__
233                 rt->rt_llinfo = (caddr_t) npcb;
234 #endif
235                 rt->rt_flags |= RTF_LLINFO;
236 #endif
237                 /*
238                  * let the lower level know this circuit is active
239                  */
240                 op.rxhand = NULL;
241                 op.param.flags |= ATMIO_FLAG_ASYNC;
242                 if (rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMOPENVCC,
243                     (caddr_t)&op) != 0) {
244                         printf("atm: couldn't add VC\n");
245                         goto failed;
246                 }
247
248                 SDL(gate)->sdl_type = rt->rt_ifp->if_type;
249                 SDL(gate)->sdl_index = rt->rt_ifp->if_index;
250
251 #ifdef NATM
252                 NATM_UNLOCK();
253 #endif
254                 break;
255
256 failed:
257 #ifdef NATM
258                 if (npcb) {
259                         npcb_free(npcb, NPCB_DESTROY);
260 #ifdef __notyet_restored__
261                         rt->rt_llinfo = NULL;
262 #endif
263                         rt->rt_flags &= ~RTF_LLINFO;
264                 }
265                 NATM_UNLOCK();
266 #endif
267                 /* mark as invalid. We cannot RTM_DELETE the route from
268                  * here, because the recursive call to rtrequest1 does
269                  * not really work. */
270                 rt->rt_flags |= RTF_REJECT;
271                 break;
272
273         case RTM_DELETE:
274 #ifdef NATM
275                 /*
276                  * tell native ATM we are done with this VC
277                  */
278                 if (rt->rt_flags & RTF_LLINFO) {
279                         NATM_LOCK();
280 #ifdef __notyet_restored__
281                         npcb_free((struct natmpcb *)rt->rt_llinfo,
282                             NPCB_DESTROY);
283                         rt->rt_llinfo = NULL;
284 #endif
285                         rt->rt_flags &= ~RTF_LLINFO;
286                         NATM_UNLOCK();
287                 }
288 #endif
289                 /*
290                  * tell the lower layer to disable this circuit
291                  */
292                 bzero(&op, sizeof(op));
293                 addr = LLADDR(SDL(gate));
294                 addr++;
295                 cl.vpi = *addr++;
296                 cl.vci = *addr++ << 8;
297                 cl.vci |= *addr++;
298                 (void)rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMCLOSEVCC,
299                     (caddr_t)&cl);
300                 break;
301         }
302 }
303
304 /*
305  * atmresolve:
306  *   inputs:
307  *     [1] "rt" = the link level route to use (or null if need to look one up)
308  *     [2] "m" = mbuf containing the data to be sent
309  *     [3] "dst" = sockaddr_in (IP) address of dest.
310  *   output:
311  *     [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
312  *   return:
313  *     0 == resolve FAILED; note that "m" gets m_freem'd in this case
314  *     1 == resolve OK; desten contains result
315  *
316  *   XXX: will need more work if we wish to support ATMARP in the kernel,
317  *   but this is enough for PVCs entered via the "route" command.
318  */
319 int
320 atmresolve(struct rtentry *rt, struct mbuf *m, const struct sockaddr *dst,
321     struct atm_pseudohdr *desten)
322 {
323         struct sockaddr_dl *sdl;
324
325         if (m->m_flags & (M_BCAST | M_MCAST)) {
326                 log(LOG_INFO,
327                     "atmresolve: BCAST/MCAST packet detected/dumped\n");
328                 goto bad;
329         }
330
331         if (rt == NULL) {
332                 /* link level on table 0 XXX MRT */
333                 rt = RTALLOC1(__DECONST(struct sockaddr *, dst), 0);
334                 if (rt == NULL)
335                         goto bad;       /* failed */
336                 RT_REMREF(rt);          /* don't keep LL references */
337                 if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
338                     rt->rt_gateway->sa_family != AF_LINK) {
339                         RT_UNLOCK(rt);
340                         goto bad;
341                 }
342                 RT_UNLOCK(rt);
343         }
344
345         /*
346          * note that rt_gateway is a sockaddr_dl which contains the
347          * atm_pseudohdr data structure for this route.   we currently
348          * don't need any rt_llinfo info (but will if we want to support
349          * ATM ARP [c.f. if_ether.c]).
350          */
351         sdl = SDL(rt->rt_gateway);
352
353         /*
354          * Check the address family and length is valid, the address
355          * is resolved; otherwise, try to resolve.
356          */
357         if (sdl->sdl_family == AF_LINK && sdl->sdl_alen >= sizeof(*desten)) {
358                 bcopy(LLADDR(sdl), desten, sizeof(*desten));
359                 return (1);     /* ok, go for it! */
360         }
361
362         /*
363          * we got an entry, but it doesn't have valid link address
364          * info in it (it is prob. the interface route, which has
365          * sdl_alen == 0).    dump packet.  (fall through to "bad").
366          */
367 bad:
368         m_freem(m);
369         return (0);
370 }
371 #endif /* INET */