Commit | Line | Data |
---|---|---|
3652553f 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 | */ | |
b8c78cd2 KS |
27 | /* $Header: /var/src/sys/netiso/RCS/clnp_input.c,v 5.1 89/02/09 16:20:32 hagens Exp $ */ |
28 | /* $Source: /var/src/sys/netiso/RCS/clnp_input.c,v $ */ | |
29 | /* @(#)clnp_input.c 7.3 (Berkeley) %G% */ | |
3652553f KS |
30 | |
31 | #ifndef lint | |
b8c78cd2 | 32 | static char *rcsid = "$Header: /var/src/sys/netiso/RCS/clnp_input.c,v 5.1 89/02/09 16:20:32 hagens Exp $"; |
3652553f KS |
33 | #endif lint |
34 | ||
35 | #include "../h/types.h" | |
36 | #include "../h/param.h" | |
37 | #include "../h/mbuf.h" | |
38 | #include "../h/domain.h" | |
39 | #include "../h/protosw.h" | |
40 | #include "../h/socket.h" | |
41 | #include "../h/socketvar.h" | |
42 | #include "../h/errno.h" | |
43 | #include "../h/time.h" | |
44 | ||
45 | #include "../net/if.h" | |
46 | #include "../net/route.h" | |
47 | ||
48 | #include "../netiso/iso.h" | |
49 | #include "../netiso/iso_var.h" | |
50 | #include "../netiso/iso_snpac.h" | |
51 | #include "../netiso/clnp.h" | |
52 | #include "../netiso/clnl.h" | |
53 | #include "../netiso/esis.h" | |
54 | #include "../netiso/clnp_stat.h" | |
55 | #include "../netiso/argo_debug.h" | |
56 | ||
57 | #ifdef ISO | |
58 | u_char clnp_protox[ISOPROTO_MAX]; | |
59 | struct clnl_protosw clnl_protox[256]; | |
60 | int clnpqmaxlen = IFQ_MAXLEN; /* RAH? why is this a variable */ | |
61 | struct mbuf *clnp_data_ck(); | |
62 | ||
63 | int clnp_input(); | |
64 | ||
65 | int esis_input(); | |
66 | ||
67 | #ifdef ISO_X25ESIS | |
68 | int x25esis_input(); | |
69 | #endif ISO_X25ESIS | |
70 | ||
71 | /* | |
72 | * FUNCTION: clnp_init | |
73 | * | |
74 | * PURPOSE: clnp initialization. Fill in clnp switch tables. | |
75 | * | |
76 | * RETURNS: none | |
77 | * | |
78 | * SIDE EFFECTS: fills in clnp_protox table with correct offsets into | |
79 | * the isosw table. | |
80 | * | |
81 | * NOTES: | |
82 | */ | |
83 | clnp_init() | |
84 | { | |
85 | register struct protosw *pr; | |
86 | ||
87 | /* | |
88 | * CLNP protox initialization | |
89 | */ | |
90 | if ((pr = pffindproto(PF_ISO, ISOPROTO_RAW, SOCK_RAW)) == 0) | |
91 | printf("clnl_init: no raw CLNP\n"); | |
92 | else | |
93 | clnp_protox[ISOPROTO_RAW] = pr - isosw; | |
94 | ||
95 | if ((pr = pffindproto(PF_ISO, ISOPROTO_TP, SOCK_SEQPACKET)) == 0) | |
96 | printf("clnl_init: no tp/clnp\n"); | |
97 | else | |
98 | clnp_protox[ISOPROTO_TP] = pr - isosw; | |
99 | ||
100 | /* | |
101 | * CLNL protox initialization | |
102 | */ | |
103 | clnl_protox[ISO8473_CLNP].clnl_input = clnp_input; | |
104 | ||
105 | clnlintrq.ifq_maxlen = clnpqmaxlen; | |
106 | } | |
107 | ||
108 | /* | |
109 | * FUNCTION: clnlintr | |
110 | * | |
111 | * PURPOSE: Process a packet on the clnl input queue | |
112 | * | |
113 | * RETURNS: nothing. | |
114 | * | |
115 | * SIDE EFFECTS: | |
116 | * | |
117 | * NOTES: | |
118 | */ | |
119 | clnlintr() | |
120 | { | |
121 | register struct mbuf *m; /* ptr to first mbuf of pkt */ | |
122 | register struct clnl_fixed *clnl; /* ptr to fixed part of clnl hdr */ | |
123 | struct ifnet *ifp; /* ptr to interface pkt arrived on */ | |
124 | int s; /* save and restore priority */ | |
125 | struct clnl_protosw *clnlsw;/* ptr to protocol switch */ | |
126 | struct snpa_hdr sh; /* subnetwork hdr */ | |
127 | ||
128 | /* | |
129 | * Get next datagram off clnl input queue | |
130 | */ | |
131 | next: | |
132 | s = splimp(); | |
133 | ||
6367ca85 KS |
134 | /* IF_DEQUEUESNPAHDR(&clnlintrq, m, sh);*/ |
135 | IF_DEQUEUE(&clnlintrq, m); | |
3652553f | 136 | |
6367ca85 KS |
137 | |
138 | splx(s); | |
139 | if (m == 0) /* nothing to do */ | |
140 | return; | |
141 | if (m->m_flags & M_PKTHDR == 0) { | |
142 | m_freem(m); | |
143 | goto next; | |
144 | } | |
145 | bcopy((caddr_t)(mtod(m, struct llc_etherhdr *)->dst), | |
146 | (caddr_t)sh.snh_dhost, 2*sizeof(sh.snh_dhost)); | |
147 | m->m_data += sizeof (struct llc_etherhdr); | |
148 | m->m_len -= sizeof (struct llc_etherhdr); | |
149 | m->m_pkthdr.len -= sizeof (struct llc_etherhdr); | |
150 | sh.snh_ifp = m->m_pkthdr.rcvif; | |
3652553f KS |
151 | IFDEBUG(D_INPUT) |
152 | int i; | |
153 | printf("clnlintr: src:"); | |
154 | for (i=0; i<6; i++) | |
155 | printf("%x%c", sh.snh_shost[i] & 0xff, (i<5) ? ':' : ' '); | |
156 | printf(" dst:"); | |
157 | for (i=0; i<6; i++) | |
158 | printf("%x%c", sh.snh_dhost[i] & 0xff, (i<5) ? ':' : ' '); | |
159 | printf("\n"); | |
160 | ENDDEBUG | |
161 | ||
3652553f KS |
162 | /* |
163 | * Get the fixed part of the clnl header into the first mbuf. | |
164 | * Drop the packet if this fails. | |
165 | * Do not call m_pullup if we have a cluster mbuf or the | |
166 | * data is not there. | |
167 | */ | |
168 | if ((IS_CLUSTER(m) || (m->m_len < sizeof(struct clnl_fixed))) && | |
169 | ((m = m_pullup(m, sizeof(struct clnl_fixed))) == 0)) { | |
170 | INCSTAT(cns_toosmall); /* TODO: use clnl stats */ | |
171 | goto next; /* m_pullup discards mbuf */ | |
172 | } | |
173 | ||
174 | clnl = mtod(m, struct clnl_fixed *); | |
175 | ||
176 | /* | |
177 | * Drop packet if the length of the header is not reasonable. | |
178 | */ | |
179 | if ((clnl->cnf_hdr_len < CLNP_HDR_MIN) || | |
180 | (clnl->cnf_hdr_len > CLNP_HDR_MAX)) { | |
181 | INCSTAT(cns_badhlen); /* TODO: use clnl stats */ | |
182 | m_freem(m); | |
183 | goto next; | |
184 | } | |
185 | ||
186 | /* | |
187 | * If the header is not contained in this mbuf, make it so. | |
188 | * Drop packet if this fails. | |
189 | * Note: m_pullup will allocate a cluster mbuf if necessary | |
190 | */ | |
191 | if (clnl->cnf_hdr_len > m->m_len) { | |
192 | if ((m = m_pullup(m, clnl->cnf_hdr_len)) == 0) { | |
193 | INCSTAT(cns_badhlen); /* TODO: use clnl stats */ | |
194 | goto next; /* m_pullup discards mbuf */ | |
195 | } | |
196 | clnl = mtod(m, struct clnl_fixed *); | |
197 | } | |
198 | ||
199 | clnlsw = &clnl_protox[clnl->cnf_proto_id]; | |
200 | ||
201 | ||
202 | if (clnlsw->clnl_input) | |
203 | (*clnlsw->clnl_input) (m, &sh); | |
204 | else | |
205 | m_freem(m); | |
206 | ||
207 | goto next; | |
208 | } | |
209 | ||
210 | /* | |
211 | * FUNCTION: clnp_input | |
212 | * | |
213 | * PURPOSE: process an incoming clnp packet | |
214 | * | |
215 | * RETURNS: nothing | |
216 | * | |
217 | * SIDE EFFECTS: increments fields of clnp_stat structure. | |
218 | * | |
219 | * NOTES: | |
220 | * TODO: I would like to make seg_part a pointer into the mbuf, but | |
221 | * will it be correctly aligned? | |
222 | */ | |
223 | int clnp_input(m, shp) | |
224 | struct mbuf *m; /* ptr to first mbuf of pkt */ | |
225 | struct snpa_hdr *shp; /* subnetwork header */ | |
226 | { | |
227 | register struct clnp_fixed *clnp; /* ptr to fixed part of header */ | |
228 | struct iso_addr src; /* source address of pkt */ | |
229 | struct iso_addr dst; /* destination address of pkt */ | |
230 | caddr_t hoff; /* current offset in packet */ | |
231 | caddr_t hend; /* address of end of header info */ | |
232 | struct clnp_segment seg_part; /* segment part of hdr */ | |
233 | int seg_off=0; /* offset of segment part of hdr */ | |
234 | int seg_len;/* length of packet data&hdr in bytes */ | |
235 | struct clnp_optidx oidx, *oidxp = NULL; /* option index */ | |
236 | extern int iso_systype; /* used by ESIS config resp */ | |
b8c78cd2 KS |
237 | int need_afrin = 0; |
238 | /* true if congestion experienced */ | |
239 | /* which means you need afrin nose */ | |
240 | /* spray. How clever! */ | |
3652553f KS |
241 | |
242 | IFDEBUG(D_INPUT) | |
243 | printf( | |
b8c78cd2 KS |
244 | "clnp_input: proccessing dg; First mbuf m_len %d, m_type x%x, %s\n", |
245 | m->m_len, m->m_type, IS_CLUSTER(m) ? "cluster" : "normal"); | |
3652553f | 246 | ENDDEBUG |
b8c78cd2 | 247 | need_afrin = 0; |
3652553f KS |
248 | |
249 | /* | |
250 | * If no iso addresses have been set, there is nothing | |
251 | * to do with the packet. | |
252 | */ | |
253 | if (iso_ifaddr == NULL) { | |
254 | clnp_discard(m, ADDR_DESTUNREACH); | |
255 | return; | |
256 | } | |
257 | ||
258 | INCSTAT(cns_total); | |
259 | clnp = mtod(m, struct clnp_fixed *); | |
260 | ||
b8c78cd2 KS |
261 | IFDEBUG(D_DUMPIN) |
262 | struct mbuf *mhead; | |
263 | int total_len = 0; | |
264 | printf("clnp_input: clnp header:\n"); | |
265 | dump_buf(mtod(m, caddr_t), clnp->cnf_hdr_len); | |
266 | printf("clnp_input: mbuf chain:\n"); | |
267 | for (mhead = m; mhead != NULL; mhead=mhead->m_next) { | |
268 | printf("m x%x, len %d\n", mhead, mhead->m_len); | |
269 | total_len += mhead->m_len; | |
270 | } | |
271 | printf("clnp_input: total length of mbuf chain %d:\n", total_len); | |
272 | ENDDEBUG | |
273 | ||
3652553f KS |
274 | /* |
275 | * Compute checksum (if necessary) and drop packet if | |
276 | * checksum does not match | |
277 | */ | |
278 | if (CKSUM_REQUIRED(clnp) && iso_check_csum(m, clnp->cnf_hdr_len)) { | |
279 | INCSTAT(cns_badcsum); | |
280 | clnp_discard(m, GEN_BADCSUM); | |
b8c78cd2 | 281 | return 0; |
3652553f KS |
282 | } |
283 | ||
284 | if (clnp->cnf_vers != ISO8473_V1) { | |
285 | INCSTAT(cns_badvers); | |
286 | clnp_discard(m, DISC_UNSUPPVERS); | |
b8c78cd2 | 287 | return 0; |
3652553f KS |
288 | } |
289 | ||
290 | ||
291 | /* check mbuf data length: clnp_data_ck will free mbuf upon error */ | |
292 | CTOH(clnp->cnf_seglen_msb, clnp->cnf_seglen_lsb, seg_len); | |
293 | if ((m = clnp_data_ck(m, seg_len)) == 0) | |
b8c78cd2 | 294 | return 0; |
3652553f KS |
295 | |
296 | clnp = mtod(m, struct clnp_fixed *); | |
297 | hend = (caddr_t)clnp + clnp->cnf_hdr_len; | |
298 | ||
299 | /* | |
300 | * extract the source and destination address | |
301 | * drop packet on failure | |
302 | */ | |
303 | bzero((caddr_t)&src, sizeof(src)); | |
304 | bzero((caddr_t)&dst, sizeof(dst)); | |
305 | ||
306 | hoff = (caddr_t)clnp + sizeof(struct clnp_fixed); | |
307 | CLNP_EXTRACT_ADDR(dst, hoff, hend); | |
308 | if (hoff == (caddr_t)0) { | |
309 | INCSTAT(cns_badaddr); | |
310 | clnp_discard(m, GEN_INCOMPLETE); | |
b8c78cd2 | 311 | return 0; |
3652553f KS |
312 | } |
313 | CLNP_EXTRACT_ADDR(src, hoff, hend); | |
314 | if (hoff == (caddr_t)0) { | |
315 | INCSTAT(cns_badaddr); | |
316 | clnp_discard(m, GEN_INCOMPLETE); | |
b8c78cd2 | 317 | return 0; |
3652553f KS |
318 | } |
319 | ||
320 | IFDEBUG(D_INPUT) | |
321 | printf("clnp_input: from %s", clnp_iso_addrp(&src)); | |
322 | printf(" to %s\n", clnp_iso_addrp(&dst)); | |
323 | ENDDEBUG | |
324 | ||
325 | /* | |
326 | * extract the segmentation information, if it is present. | |
327 | * drop packet on failure | |
328 | */ | |
329 | if ((clnp->cnf_type != CLNP_ER) && (clnp->cnf_seg_ok)) { | |
330 | if (hoff + sizeof(struct clnp_segment) > hend) { | |
331 | INCSTAT(cns_noseg); | |
332 | clnp_discard(m, GEN_INCOMPLETE); | |
b8c78cd2 | 333 | return 0; |
3652553f KS |
334 | } else { |
335 | (void) bcopy(hoff, (caddr_t)&seg_part, sizeof(struct clnp_segment)); | |
336 | /* make sure segmentation fields are in host order */ | |
337 | seg_part.cng_id = ntohs(seg_part.cng_id); | |
338 | seg_part.cng_off = ntohs(seg_part.cng_off); | |
339 | seg_part.cng_tot_len = ntohs(seg_part.cng_tot_len); | |
340 | seg_off = hoff - (caddr_t)clnp; | |
341 | hoff += sizeof(struct clnp_segment); | |
342 | } | |
343 | } | |
344 | ||
345 | /* | |
346 | * process options if present. If clnp_opt_sanity returns | |
347 | * false (indicating an error was found in the options) or | |
348 | * an unsupported option was found | |
349 | * then drop packet and emit an ER. | |
350 | */ | |
351 | if (hoff < hend) { | |
352 | int errcode; | |
353 | ||
354 | oidxp = &oidx; | |
355 | errcode = clnp_opt_sanity(m, hoff, hend-hoff, oidxp); | |
356 | ||
357 | /* we do not support security */ | |
358 | if ((errcode == 0) && (oidxp->cni_securep)) | |
359 | errcode = DISC_UNSUPPSECURE; | |
360 | ||
361 | /* the er option is valid with ER pdus only */ | |
362 | if ((errcode == 0) && (oidxp->cni_er_reason != ER_INVALREAS) && | |
363 | (clnp->cnf_type != CLNP_ER)) | |
364 | errcode = DISC_UNSUPPOPT; | |
365 | ||
b8c78cd2 KS |
366 | #ifdef DECBIT |
367 | /* check if the congestion experienced bit is set */ | |
368 | if (oidxp->cni_qos_formatp) { | |
369 | caddr_t qosp = CLNP_OFFTOOPT(m, oidxp->cni_qos_formatp); | |
370 | u_char qos = *qosp; | |
371 | ||
372 | need_afrin = ((qos & (CLNPOVAL_GLOBAL|CLNPOVAL_CONGESTED)) == | |
373 | (CLNPOVAL_GLOBAL|CLNPOVAL_CONGESTED)); | |
374 | if (need_afrin) | |
375 | INCSTAT(cns_congest_rcvd); | |
376 | } | |
377 | #endif DECBIT | |
378 | ||
3652553f KS |
379 | if (errcode != 0) { |
380 | clnp_discard(m, (char)errcode); | |
381 | IFDEBUG(D_INPUT) | |
382 | printf("clnp_input: dropped (err x%x) due to bad options\n", | |
383 | errcode); | |
384 | ENDDEBUG | |
b8c78cd2 | 385 | return 0; |
3652553f KS |
386 | } |
387 | } | |
388 | ||
389 | /* | |
390 | * check if this packet is for us. if not, then forward | |
391 | */ | |
392 | if (clnp_ours(&dst) == 0) { | |
393 | IFDEBUG(D_INPUT) | |
394 | printf("clnp_input: forwarding packet not for us\n"); | |
395 | ENDDEBUG | |
396 | clnp_forward(m, seg_len, &dst, oidxp, seg_off, shp); | |
b8c78cd2 | 397 | return 0; |
3652553f KS |
398 | } |
399 | ||
400 | /* | |
401 | * ESIS Configuration Response Function | |
402 | * | |
403 | * If the packet received was sent to the multicast address | |
404 | * all end systems, then send an esh to the source | |
405 | */ | |
406 | if ((IS_MULTICAST(shp->snh_dhost)) && (iso_systype == SNPA_ES)) { | |
407 | extern short esis_holding_time; | |
408 | ||
409 | esis_shoutput(shp->snh_ifp, ESIS_ESH, esis_holding_time, | |
410 | shp->snh_shost, 6); | |
411 | } | |
412 | ||
413 | /* | |
414 | * If this is a fragment, then try to reassemble it. If clnp_reass | |
415 | * returns non NULL, the packet has been reassembled, and should | |
416 | * be give to TP. Otherwise the fragment has been delt with | |
417 | * by the reassembly code (either stored or deleted). In either case | |
418 | * we should have nothing more to do with it. | |
419 | */ | |
420 | if ((clnp->cnf_type != CLNP_ER) && (clnp->cnf_seg_ok) && | |
421 | (seg_len != seg_part.cng_tot_len)) { | |
422 | struct mbuf *m0; | |
423 | ||
424 | if ((m0 = clnp_reass(m, &src, &dst, &seg_part)) != NULL) { | |
425 | m = m0; | |
426 | clnp = mtod(m, struct clnp_fixed *); | |
427 | } else { | |
b8c78cd2 | 428 | return 0; |
3652553f KS |
429 | } |
430 | } | |
431 | ||
432 | /* | |
433 | * give the packet to the higher layer | |
3652553f KS |
434 | * |
435 | * Note: the total length of packet | |
436 | * is the total length field of the segmentation part, | |
437 | * or, if absent, the segment length field of the | |
438 | * header. | |
439 | */ | |
440 | switch (clnp->cnf_type) { | |
441 | case CLNP_ER: | |
442 | /* | |
443 | * This ER must have the er option. | |
444 | * If the option is not present, discard datagram. | |
445 | */ | |
446 | if (oidxp == NULL || oidxp->cni_er_reason == ER_INVALREAS) { | |
447 | clnp_discard(m, GEN_HDRSYNTAX); | |
448 | } else { | |
449 | clnp_er_input(m, &src, oidxp->cni_er_reason); | |
450 | } | |
451 | break; | |
452 | ||
453 | case CLNP_DT: | |
b8c78cd2 KS |
454 | if (need_afrin) { |
455 | /* NOTE: do this before TP gets the packet so tp ack can use info*/ | |
456 | IFDEBUG(D_INPUT) | |
457 | printf("clnp_input: Calling tpclnp_ctlinput(%s)\n", | |
458 | clnp_iso_addrp(&src)); | |
459 | ENDDEBUG | |
460 | tpclnp_ctlinput1(PRC_QUENCH2, &src); | |
461 | } | |
3652553f KS |
462 | (*isosw[clnp_protox[ISOPROTO_TP]].pr_input)(m, &src, &dst, |
463 | clnp->cnf_hdr_len); | |
464 | break; | |
465 | ||
466 | case CLNP_RAW: | |
467 | case CLNP_ECR: | |
468 | IFDEBUG(D_INPUT) | |
469 | printf("clnp_input: raw input of %d bytes\n", | |
470 | clnp->cnf_seg_ok ? seg_part.cng_tot_len : seg_len); | |
471 | ENDDEBUG | |
472 | (*isosw[clnp_protox[ISOPROTO_RAW]].pr_input)(m, &src, &dst, | |
473 | clnp->cnf_hdr_len); | |
474 | break; | |
475 | ||
476 | case CLNP_EC: | |
477 | IFDEBUG(D_INPUT) | |
478 | printf("clnp_input: echoing packet\n"); | |
479 | ENDDEBUG | |
480 | /* | |
481 | * Switch the source and destination address, | |
482 | */ | |
483 | hoff = (caddr_t)clnp + sizeof(struct clnp_fixed); | |
484 | CLNP_INSERT_ADDR(hoff, &src); | |
485 | CLNP_INSERT_ADDR(hoff, &dst); | |
486 | clnp->cnf_type = CLNP_ECR; | |
487 | ||
488 | /* | |
489 | * Forward back to sender | |
490 | */ | |
491 | clnp_forward(m, clnp->cnf_seg_ok ? seg_part.cng_tot_len : seg_len, | |
492 | &src, oidxp, seg_off, shp); | |
493 | break; | |
494 | ||
495 | default: | |
496 | printf("clnp_input: unknown clnp pkt type %d\n", clnp->cnf_type); | |
497 | clnp_discard(m, GEN_HDRSYNTAX); | |
498 | break; | |
499 | } | |
500 | } | |
3652553f | 501 | #endif ISO |