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e832ea14 KS |
1 | /*********************************************************** |
2 | Copyright IBM Corporation 1987 | |
3 | ||
4 | All Rights Reserved | |
5 | ||
6 | Permission to use, copy, modify, and distribute this software and its | |
7 | documentation for any purpose and without fee is hereby granted, | |
8 | provided that the above copyright notice appear in all copies and that | |
9 | both that copyright notice and this permission notice appear in | |
10 | supporting documentation, and that the name of IBM not be | |
11 | used in advertising or publicity pertaining to distribution of the | |
12 | software without specific, written prior permission. | |
13 | ||
14 | IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING | |
15 | ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL | |
16 | IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR | |
17 | ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, | |
18 | WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, | |
19 | ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS | |
20 | SOFTWARE. | |
21 | ||
22 | ******************************************************************/ | |
23 | ||
24 | /* | |
25 | * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison | |
26 | */ | |
ede75751 KS |
27 | /* $Header: /var/src/sys/netiso/RCS/clnp_subr.c,v 5.1 89/02/09 16:20:46 hagens Exp $ */ |
28 | /* $Source: /var/src/sys/netiso/RCS/clnp_subr.c,v $ */ | |
e832ea14 KS |
29 | |
30 | #ifndef lint | |
ede75751 | 31 | static char *rcsid = "$Header: /var/src/sys/netiso/RCS/clnp_subr.c,v 5.1 89/02/09 16:20:46 hagens Exp $"; |
e832ea14 KS |
32 | #endif lint |
33 | ||
34 | #ifdef ISO | |
35 | ||
a50e2bc0 KS |
36 | #include "types.h" |
37 | #include "param.h" | |
38 | #include "mbuf.h" | |
39 | #include "domain.h" | |
40 | #include "protosw.h" | |
41 | #include "socket.h" | |
42 | #include "socketvar.h" | |
43 | #include "errno.h" | |
44 | #include "time.h" | |
e832ea14 KS |
45 | |
46 | #include "../net/if.h" | |
47 | #include "../net/route.h" | |
48 | ||
a50e2bc0 KS |
49 | #include "iso.h" |
50 | #include "iso_var.h" | |
51 | #include "iso_pcb.h" | |
52 | #include "iso_snpac.h" | |
53 | #include "clnp.h" | |
54 | #include "clnp_stat.h" | |
55 | #include "argo_debug.h" | |
e832ea14 KS |
56 | |
57 | /* | |
58 | * FUNCTION: clnp_data_ck | |
59 | * | |
60 | * PURPOSE: Check that the amount of data in the mbuf chain is | |
61 | * at least as much as the clnp header would have us | |
62 | * expect. Trim mbufs if longer than expected, drop | |
63 | * packet if shorter than expected. | |
64 | * | |
65 | * RETURNS: success - ptr to mbuf chain | |
66 | * failure - 0 | |
67 | * | |
68 | * SIDE EFFECTS: | |
69 | * | |
70 | * NOTES: | |
71 | */ | |
72 | struct mbuf * | |
73 | clnp_data_ck(m, length) | |
74 | register struct mbuf *m; /* ptr to mbuf chain containing hdr & data */ | |
75 | int length; /* length (in bytes) of packet */ | |
76 | { | |
77 | register int len; /* length of data */ | |
78 | register struct mbuf *mhead; /* ptr to head of chain */ | |
79 | ||
80 | len = -length; | |
81 | mhead = m; | |
82 | for (;;) { | |
83 | len += m->m_len; | |
84 | if (m->m_next == 0) | |
85 | break; | |
86 | m = m->m_next; | |
87 | } | |
88 | if (len != 0) { | |
89 | if (len < 0) { | |
90 | INCSTAT(cns_toosmall); | |
91 | clnp_discard(mhead, GEN_INCOMPLETE); | |
92 | return 0; | |
93 | } | |
94 | if (len <= m->m_len) | |
95 | m->m_len -= len; | |
96 | else | |
97 | m_adj(mhead, -len); | |
98 | } | |
99 | return mhead; | |
100 | } | |
101 | ||
102 | #ifdef ndef | |
103 | /* | |
104 | * FUNCTION: clnp_extract_addr | |
105 | * | |
106 | * PURPOSE: Extract the source and destination address from the | |
107 | * supplied buffer. Place them in the supplied address buffers. | |
108 | * If insufficient data is supplied, then fail. | |
109 | * | |
110 | * RETURNS: success - Address of first byte in the packet past | |
111 | * the address part. | |
112 | * failure - 0 | |
113 | * | |
114 | * SIDE EFFECTS: | |
115 | * | |
116 | * NOTES: | |
117 | */ | |
118 | caddr_t | |
119 | clnp_extract_addr(bufp, buflen, srcp, destp) | |
120 | caddr_t bufp; /* ptr to buffer containing addresses */ | |
121 | int buflen; /* length of buffer */ | |
122 | register struct iso_addr *srcp; /* ptr to source address buffer */ | |
123 | register struct iso_addr *destp; /* ptr to destination address buffer */ | |
124 | { | |
125 | int len; /* argument to bcopy */ | |
126 | ||
127 | /* | |
128 | * check that we have enough data. Plus1 is for length octet | |
129 | */ | |
130 | if ((u_char)*bufp + 1 > buflen) { | |
131 | return((caddr_t)0); | |
132 | } | |
133 | len = destp->isoa_len = (u_char)*bufp++; | |
134 | (void) bcopy(bufp, (caddr_t)destp, len); | |
135 | buflen -= len; | |
136 | bufp += len; | |
137 | ||
138 | /* | |
139 | * check that we have enough data. Plus1 is for length octet | |
140 | */ | |
141 | if ((u_char)*bufp + 1 > buflen) { | |
142 | return((caddr_t)0); | |
143 | } | |
144 | len = srcp->isoa_len = (u_char)* bufp++; | |
145 | (void) bcopy(bufp, (caddr_t)srcp, len); | |
146 | bufp += len; | |
147 | ||
148 | /* | |
149 | * Insure that the addresses make sense | |
150 | */ | |
151 | if (iso_ck_addr(srcp) && iso_ck_addr(destp)) | |
152 | return bufp; | |
153 | else | |
154 | return (caddr_t) 0; | |
155 | } | |
156 | #endif ndef | |
157 | ||
158 | /* | |
159 | * FUNCTION: clnp_ours | |
160 | * | |
161 | * PURPOSE: Decide whether the supplied packet is destined for | |
162 | * us, or that it should be forwarded on. | |
163 | * | |
164 | * RETURNS: packet is for us - 1 | |
165 | * packet is not for us - 0 | |
166 | * | |
167 | * SIDE EFFECTS: | |
168 | * | |
169 | * NOTES: | |
170 | */ | |
171 | clnp_ours(dst) | |
172 | register struct iso_addr *dst; /* ptr to destination address */ | |
173 | { | |
174 | register struct iso_ifaddr *ia; /* scan through interface addresses */ | |
175 | ||
176 | for (ia = iso_ifaddr; ia; ia = ia->ia_next) { | |
177 | IFDEBUG(D_ROUTE) | |
178 | printf("clnp_ours: ia_sis x%x, dst x%x\n", &IA_SIS(ia)->siso_addr, | |
179 | dst); | |
180 | ENDDEBUG | |
181 | /* PHASE 2: uses iso_addrmatch & mask from iso_ifaddr */ | |
182 | if (iso_addrmatch1(&IA_SIS(ia)->siso_addr, dst)) | |
183 | return 1; | |
184 | } | |
185 | return 0; | |
186 | } | |
187 | ||
ede75751 KS |
188 | /* Dec bit set if ifp qlen is greater than congest_threshold */ |
189 | int congest_threshold = 0; | |
190 | ||
e832ea14 KS |
191 | /* |
192 | * FUNCTION: clnp_forward | |
193 | * | |
194 | * PURPOSE: Forward the datagram passed | |
195 | * clnpintr guarantees that the header will be | |
196 | * contigious (a cluster mbuf will be used if necessary). | |
197 | * | |
198 | * If oidx is NULL, no options are present. | |
199 | * | |
200 | * RETURNS: nothing | |
201 | * | |
202 | * SIDE EFFECTS: | |
203 | * | |
204 | * NOTES: | |
205 | */ | |
206 | clnp_forward(m, len, dst, oidx, seg_off, inbound_shp) | |
207 | struct mbuf *m; /* pkt to forward */ | |
208 | int len; /* length of pkt */ | |
209 | struct iso_addr *dst; /* destination address */ | |
210 | struct clnp_optidx *oidx; /* option index */ | |
211 | int seg_off;/* offset of segmentation part */ | |
212 | struct snpa_hdr *inbound_shp; /* subnetwork header of inbound packet */ | |
213 | { | |
214 | struct clnp_fixed *clnp; /* ptr to fixed part of header */ | |
215 | int error; /* return value of route function */ | |
216 | struct sockaddr *next_hop; /* next hop for dgram */ | |
217 | struct ifnet *ifp; /* ptr to outgoing interface */ | |
a50e2bc0 | 218 | struct iso_ifaddr *ia = 0;/* ptr to iso name for ifp */ |
fa350669 | 219 | struct route_iso route; /* filled in by clnp_route */ |
e832ea14 KS |
220 | extern int iso_systype; |
221 | ||
222 | clnp = mtod(m, struct clnp_fixed *); | |
223 | bzero((caddr_t)&route, sizeof(route)); /* MUST be done before "bad:" */ | |
224 | ||
225 | /* | |
226 | * Don't forward multicast or broadcast packets | |
227 | */ | |
228 | if ((inbound_shp) && (IS_MULTICAST(inbound_shp->snh_dhost))) { | |
229 | IFDEBUG(D_FORWARD) | |
230 | printf("clnp_forward: dropping multicast packet\n"); | |
231 | ENDDEBUG | |
a50e2bc0 | 232 | clnp->cnf_type &= ~CNF_ERR_OK; /* so we don't generate an ER */ |
e832ea14 KS |
233 | clnp_discard(m, 0); |
234 | goto done; | |
235 | } | |
236 | ||
237 | IFDEBUG(D_FORWARD) | |
238 | printf("clnp_forward: %d bytes, to %s, options x%x\n", len, | |
239 | clnp_iso_addrp(dst), oidx); | |
240 | ENDDEBUG | |
241 | ||
242 | /* | |
243 | * Decrement ttl, and if zero drop datagram | |
244 | * Can't compare ttl as less than zero 'cause its a unsigned | |
245 | */ | |
246 | if ((clnp->cnf_ttl == 0) || (--clnp->cnf_ttl == 0)) { | |
247 | IFDEBUG(D_FORWARD) | |
248 | printf("clnp_forward: discarding datagram because ttl is zero\n"); | |
249 | ENDDEBUG | |
250 | INCSTAT(cns_ttlexpired); | |
251 | clnp_discard(m, TTL_EXPTRANSIT); | |
252 | goto done; | |
253 | } | |
e832ea14 KS |
254 | /* |
255 | * Route packet; special case for source rt | |
256 | */ | |
257 | if CLNPSRCRT_VALID(oidx) { | |
258 | /* | |
259 | * Update src route first | |
260 | */ | |
261 | clnp_update_srcrt(m, oidx); | |
a50e2bc0 | 262 | error = clnp_srcroute(m, oidx, &route, &next_hop, &ia, dst); |
e832ea14 | 263 | } else { |
a50e2bc0 | 264 | error = clnp_route(dst, &route, 0, &next_hop, &ia); |
e832ea14 | 265 | } |
a50e2bc0 | 266 | if (error || ia == 0) { |
e832ea14 KS |
267 | IFDEBUG(D_FORWARD) |
268 | printf("clnp_forward: can't route packet (errno %d)\n", error); | |
269 | ENDDEBUG | |
270 | clnp_discard(m, ADDR_DESTUNREACH); | |
271 | goto done; | |
272 | } | |
a50e2bc0 | 273 | ifp = ia->ia_ifp; |
e832ea14 KS |
274 | |
275 | IFDEBUG(D_FORWARD) | |
276 | printf("clnp_forward: packet routed to %s\n", | |
277 | clnp_iso_addrp(&((struct sockaddr_iso *)next_hop)->siso_addr)); | |
278 | ENDDEBUG | |
279 | ||
280 | INCSTAT(cns_forward); | |
281 | ||
282 | /* | |
283 | * If we are an intermediate system and | |
284 | * we are routing outbound on the same ifp that the packet | |
285 | * arrived upon, and we know the next hop snpa, | |
286 | * then generate a redirect request | |
287 | */ | |
288 | if ((iso_systype & SNPA_IS) && (inbound_shp) && | |
289 | (ifp == inbound_shp->snh_ifp)) { | |
290 | struct snpa_cache *sc; | |
291 | ||
292 | sc = snpac_look(&((struct sockaddr_iso *)next_hop)->siso_addr); | |
293 | if (sc != NULL) { | |
294 | esis_rdoutput(inbound_shp, m, oidx, dst, sc); | |
295 | } | |
296 | } | |
297 | ||
298 | /* | |
299 | * If options are present, update them | |
300 | */ | |
301 | if (oidx) { | |
a50e2bc0 | 302 | struct iso_addr *mysrc = &ia->ia_addr.siso_addr; |
e832ea14 KS |
303 | if (mysrc == NULL) { |
304 | clnp_discard(m, ADDR_DESTUNREACH); | |
305 | goto done; | |
306 | } else { | |
ede75751 KS |
307 | (void) clnp_dooptions(m, oidx, ifp, mysrc); |
308 | } | |
309 | } | |
310 | ||
311 | #ifdef DECBIT | |
312 | if (ifp->if_snd.ifq_len > congest_threshold) { | |
313 | /* | |
314 | * Congestion! Set the Dec Bit and thank Dave Oran | |
315 | */ | |
316 | IFDEBUG(D_FORWARD) | |
317 | printf("clnp_forward: congestion experienced\n"); | |
318 | ENDDEBUG | |
319 | if ((oidx) && (oidx->cni_qos_formatp)) { | |
320 | caddr_t qosp = CLNP_OFFTOOPT(m, oidx->cni_qos_formatp); | |
321 | u_char qos = *qosp; | |
322 | IFDEBUG(D_FORWARD) | |
323 | printf("clnp_forward: setting congestion bit (qos x%x)\n", qos); | |
324 | ENDDEBUG | |
325 | if ((qos & CLNPOVAL_GLOBAL) == CLNPOVAL_GLOBAL) { | |
326 | qos |= CLNPOVAL_CONGESTED; | |
327 | INCSTAT(cns_congest_set); | |
328 | *qosp = qos; | |
329 | } | |
e832ea14 KS |
330 | } |
331 | } | |
ede75751 | 332 | #endif DECBIT |
e832ea14 KS |
333 | |
334 | /* | |
335 | * Dispatch the datagram if it is small enough, otherwise fragment | |
336 | */ | |
337 | if (len <= SN_MTU(ifp)) { | |
338 | iso_gen_csum(m, CLNP_CKSUM_OFF, (int)clnp->cnf_hdr_len); | |
339 | (void) (*ifp->if_output)(ifp, m, next_hop); | |
340 | } else { | |
341 | (void) clnp_fragment(ifp, m, next_hop, len, seg_off, /* flags */0); | |
342 | } | |
343 | ||
344 | done: | |
345 | /* | |
346 | * Free route | |
347 | */ | |
348 | if (route.ro_rt != NULL) { | |
349 | RTFREE(route.ro_rt); | |
350 | } | |
351 | } | |
352 | ||
353 | #ifdef ndef | |
354 | /* | |
355 | * FUNCTION: clnp_insert_addr | |
356 | * | |
357 | * PURPOSE: Insert the address part into a clnp datagram. | |
358 | * | |
359 | * RETURNS: Address of first byte after address part in datagram. | |
360 | * | |
361 | * SIDE EFFECTS: | |
362 | * | |
363 | * NOTES: Assume that there is enough space for the address part. | |
364 | */ | |
365 | caddr_t | |
366 | clnp_insert_addr(bufp, srcp, dstp) | |
367 | caddr_t bufp; /* address of where addr part goes */ | |
368 | register struct iso_addr *srcp; /* ptr to src addr */ | |
369 | register struct iso_addr *dstp; /* ptr to dst addr */ | |
370 | { | |
371 | *bufp++ = dstp->isoa_len; | |
372 | (void) bcopy((caddr_t)dstp, bufp, dstp->isoa_len); | |
373 | bufp += dstp->isoa_len; | |
374 | ||
375 | *bufp++ = srcp->isoa_len; | |
376 | (void) bcopy((caddr_t)srcp, bufp, srcp->isoa_len); | |
377 | bufp += srcp->isoa_len; | |
378 | ||
379 | return bufp; | |
380 | } | |
381 | ||
382 | #endif ndef | |
383 | ||
384 | /* | |
385 | * FUNCTION: clnp_route | |
386 | * | |
387 | * PURPOSE: Route a clnp datagram to the first hop toward its | |
388 | * destination. In many cases, the first hop will be | |
389 | * the destination. The address of a route | |
390 | * is specified. If a routing entry is present in | |
391 | * that route, and it is still up to the same destination, | |
392 | * then no further action is necessary. Otherwise, a | |
393 | * new routing entry will be allocated. | |
394 | * | |
395 | * RETURNS: route found - 0 | |
396 | * unix error code | |
397 | * | |
398 | * SIDE EFFECTS: | |
399 | * | |
400 | * NOTES: It is up to the caller to free the routing entry | |
401 | * allocated in route. | |
402 | */ | |
a50e2bc0 KS |
403 | clnp_route(dst, ro, flags, first_hop, ifa) |
404 | struct iso_addr *dst; /* ptr to datagram destination */ | |
405 | register struct route_iso *ro; /* existing route structure */ | |
406 | int flags; /* flags for routing */ | |
407 | struct sockaddr **first_hop; /* result: fill in with ptr to firsthop */ | |
408 | struct iso_ifaddr **ifa; /* result: fill in with ptr to interface */ | |
e832ea14 | 409 | { |
a50e2bc0 KS |
410 | if (flags & SO_DONTROUTE) { |
411 | struct sockaddr_iso dest; | |
412 | struct iso_ifaddr *ia; | |
413 | ||
414 | bzero((caddr_t)&dest, sizeof(dest)); | |
415 | bcopy((caddr_t)dst, (caddr_t)&dest.siso_addr, | |
416 | 1 + (unsigned)dst->isoa_len); | |
417 | dest.siso_family = AF_ISO; | |
418 | dest.siso_len = sizeof(dest); | |
419 | ia = iso_localifa(&dest); | |
420 | if (ia == 0) | |
421 | return EADDRNOTAVAIL; | |
422 | if (ifa) | |
423 | *ifa = (struct iso_ifaddr *)ia; | |
424 | return 0; | |
425 | } | |
e832ea14 KS |
426 | /* |
427 | * If there is a cached route, check that it is still up and to | |
428 | * the same destination. If not, free it and try again. | |
429 | */ | |
430 | if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || | |
a50e2bc0 | 431 | (Bcmp(ro->ro_dst.siso_data, dst->isoa_genaddr, dst->isoa_len)))) { |
e832ea14 KS |
432 | IFDEBUG(D_ROUTE) |
433 | printf("clnp_route: freeing old route: ro->ro_rt 0x%x\n", | |
434 | ro->ro_rt); | |
435 | printf("clnp_route: old route refcnt: 0x%x\n", | |
436 | ro->ro_rt->rt_refcnt); | |
437 | ENDDEBUG | |
438 | ||
439 | /* free old route entry */ | |
440 | RTFREE(ro->ro_rt); | |
441 | ro->ro_rt = (struct rtentry *)0; | |
442 | } else { | |
443 | IFDEBUG(D_ROUTE) | |
444 | printf("clnp_route: OK route exists\n"); | |
445 | ENDDEBUG | |
446 | } | |
447 | ||
448 | if (ro->ro_rt == 0) { | |
449 | /* set up new route structure */ | |
a50e2bc0 KS |
450 | bzero((caddr_t)&ro->ro_dst, sizeof(ro->ro_dst)); |
451 | ro->ro_dst.siso_len = sizeof(ro->ro_dst); | |
452 | ro->ro_dst.siso_family = AF_ISO; | |
453 | Bcopy(dst, &ro->ro_dst.siso_addr, 1 + dst->isoa_len); | |
e832ea14 KS |
454 | /* allocate new route */ |
455 | IFDEBUG(D_ROUTE) | |
456 | printf("clnp_route: allocating new route to %s\n", | |
457 | clnp_iso_addrp(dst)); | |
458 | ENDDEBUG | |
a50e2bc0 | 459 | rtalloc((struct route *)ro); |
e832ea14 | 460 | } |
a50e2bc0 | 461 | if (ro->ro_rt == 0) |
e832ea14 | 462 | return(ENETUNREACH); /* rtalloc failed */ |
e832ea14 | 463 | ro->ro_rt->rt_use++; |
a50e2bc0 KS |
464 | if (ifa) |
465 | if ((*ifa = (struct iso_ifaddr *)ro->ro_rt->rt_ifa) == 0) | |
466 | panic("clnp_route"); | |
467 | if (first_hop) { | |
468 | if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST)) | |
469 | *first_hop = ro->ro_rt->rt_gateway; | |
470 | else | |
471 | *first_hop = (struct sockaddr *)&ro->ro_dst; | |
472 | } | |
e832ea14 KS |
473 | return(0); |
474 | } | |
475 | ||
476 | /* | |
477 | * FUNCTION: clnp_srcroute | |
478 | * | |
479 | * PURPOSE: Source route the datagram. If complete source | |
480 | * routing is specified but not possible, then | |
481 | * return an error. If src routing is terminated, then | |
482 | * try routing on destination. | |
483 | * Usage of first_hop, | |
484 | * ifp, and error return is identical to clnp_route. | |
485 | * | |
486 | * RETURNS: 0 or unix error code | |
487 | * | |
488 | * SIDE EFFECTS: | |
489 | * | |
490 | * NOTES: Remember that option index pointers are really | |
491 | * offsets from the beginning of the mbuf. | |
492 | */ | |
a50e2bc0 | 493 | clnp_srcroute(options, oidx, route, first_hop, ifa, final_dst) |
e832ea14 KS |
494 | struct mbuf *options; /* ptr to options */ |
495 | struct clnp_optidx *oidx; /* index to options */ | |
a50e2bc0 | 496 | struct route_iso *route; /* route structure */ |
e832ea14 | 497 | struct sockaddr **first_hop; /* RETURN: fill in with ptr to firsthop */ |
a50e2bc0 | 498 | struct iso_ifaddr **ifa; /* RETURN: fill in with ptr to interface */ |
e832ea14 KS |
499 | struct iso_addr *final_dst; /* final destination */ |
500 | { | |
501 | struct iso_addr dst; /* first hop specified by src rt */ | |
502 | int error = 0; /* return code */ | |
503 | ||
504 | /* | |
505 | * Check if we have run out of routes | |
506 | * If so, then try to route on destination. | |
507 | */ | |
508 | if CLNPSRCRT_TERM(oidx, options) { | |
509 | dst.isoa_len = final_dst->isoa_len; | |
a50e2bc0 | 510 | bcopy(final_dst->isoa_genaddr, dst.isoa_genaddr, dst.isoa_len); |
e832ea14 KS |
511 | } else { |
512 | /* | |
513 | * setup dst based on src rt specified | |
514 | */ | |
515 | dst.isoa_len = CLNPSRCRT_CLEN(oidx, options); | |
a50e2bc0 | 516 | bcopy(CLNPSRCRT_CADDR(oidx, options), dst.isoa_genaddr, dst.isoa_len); |
e832ea14 KS |
517 | } |
518 | ||
519 | /* | |
520 | * try to route it | |
521 | */ | |
a50e2bc0 | 522 | error = clnp_route(&dst, route, 0, first_hop, ifa); |
e832ea14 KS |
523 | if (error != 0) |
524 | return error; | |
525 | ||
526 | /* | |
527 | * If complete src rt, first hop must be equal to dst | |
528 | */ | |
529 | if ((CLNPSRCRT_TYPE(oidx, options) == CLNPOVAL_COMPRT) && | |
530 | (!iso_addrmatch1(&(*(struct sockaddr_iso **)first_hop)->siso_addr,&dst))){ | |
531 | IFDEBUG(D_OPTIONS) | |
532 | printf("clnp_srcroute: complete src route failed\n"); | |
533 | ENDDEBUG | |
534 | return EHOSTUNREACH; /* RAH? would like ESRCRTFAILED */ | |
535 | } | |
536 | ||
537 | return error; | |
538 | } | |
539 | ||
e832ea14 KS |
540 | /* |
541 | * FUNCTION: clnp_ypocb - backwards bcopy | |
542 | * | |
543 | * PURPOSE: bcopy starting at end of src rather than beginning. | |
544 | * | |
545 | * RETURNS: none | |
546 | * | |
547 | * SIDE EFFECTS: | |
548 | * | |
549 | * NOTES: No attempt has been made to make this efficient | |
550 | */ | |
551 | clnp_ypocb(from, to, len) | |
552 | caddr_t from; /* src buffer */ | |
553 | caddr_t to; /* dst buffer */ | |
554 | u_int len; /* number of bytes */ | |
555 | { | |
556 | while (len--) | |
557 | *(to + len) = *(from + len); | |
558 | } | |
559 | ||
560 | /* | |
561 | * FUNCTION: clnp_hdrsize | |
562 | * | |
563 | * PURPOSE: Return the size of a typical clnp hdr. | |
564 | * | |
565 | * RETURNS: Size of hdr in bytes. | |
566 | * | |
567 | * SIDE EFFECTS: | |
568 | * | |
569 | * NOTES: Assumes segmenting subset. If addrlen is | |
570 | * zero, default to largest nsap address size. | |
571 | */ | |
572 | clnp_hdrsize(addrlen) | |
573 | u_char addrlen; /* length of nsap address */ | |
574 | { | |
575 | if (addrlen == 0) | |
576 | addrlen = 20; | |
577 | ||
578 | addrlen++; /* length of address byte */ | |
579 | addrlen *= 2; /* src and dst addresses */ | |
580 | addrlen += sizeof(struct clnp_fixed) + sizeof(struct clnp_segment); | |
581 | ||
582 | return(addrlen); | |
583 | } | |
584 | #endif ISO |