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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 | */ | |
27 | /* $Header: clnp_input.c,v 4.4 88/09/08 08:38:15 hagens Exp $ */ | |
28 | /* $Source: /usr/argo/sys/netiso/RCS/clnp_input.c,v $ */ | |
29 | ||
30 | #ifndef lint | |
31 | static char *rcsid = "$Header: clnp_input.c,v 4.4 88/09/08 08:38:15 hagens Exp $"; | |
32 | #endif lint | |
33 | ||
34 | #include "../h/types.h" | |
35 | #include "../h/param.h" | |
36 | #include "../h/mbuf.h" | |
37 | #include "../h/domain.h" | |
38 | #include "../h/protosw.h" | |
39 | #include "../h/socket.h" | |
40 | #include "../h/socketvar.h" | |
41 | #include "../h/errno.h" | |
42 | #include "../h/time.h" | |
43 | ||
44 | #include "../net/if.h" | |
45 | #include "../net/route.h" | |
46 | ||
47 | #include "../netiso/iso.h" | |
48 | #include "../netiso/iso_var.h" | |
49 | #include "../netiso/iso_snpac.h" | |
50 | #include "../netiso/clnp.h" | |
51 | #include "../netiso/clnl.h" | |
52 | #include "../netiso/esis.h" | |
53 | #include "../netiso/clnp_stat.h" | |
54 | #include "../netiso/argo_debug.h" | |
55 | ||
56 | #ifdef ISO | |
57 | u_char clnp_protox[ISOPROTO_MAX]; | |
58 | struct clnl_protosw clnl_protox[256]; | |
59 | int clnpqmaxlen = IFQ_MAXLEN; /* RAH? why is this a variable */ | |
60 | struct mbuf *clnp_data_ck(); | |
61 | ||
62 | int clnp_input(); | |
63 | ||
64 | int esis_input(); | |
65 | ||
66 | #ifdef ISO_X25ESIS | |
67 | int x25esis_input(); | |
68 | #endif ISO_X25ESIS | |
69 | ||
70 | /* | |
71 | * FUNCTION: clnp_init | |
72 | * | |
73 | * PURPOSE: clnp initialization. Fill in clnp switch tables. | |
74 | * | |
75 | * RETURNS: none | |
76 | * | |
77 | * SIDE EFFECTS: fills in clnp_protox table with correct offsets into | |
78 | * the isosw table. | |
79 | * | |
80 | * NOTES: | |
81 | */ | |
82 | clnp_init() | |
83 | { | |
84 | register struct protosw *pr; | |
85 | ||
86 | /* | |
87 | * CLNP protox initialization | |
88 | */ | |
89 | if ((pr = pffindproto(PF_ISO, ISOPROTO_RAW, SOCK_RAW)) == 0) | |
90 | printf("clnl_init: no raw CLNP\n"); | |
91 | else | |
92 | clnp_protox[ISOPROTO_RAW] = pr - isosw; | |
93 | ||
94 | if ((pr = pffindproto(PF_ISO, ISOPROTO_TP, SOCK_SEQPACKET)) == 0) | |
95 | printf("clnl_init: no tp/clnp\n"); | |
96 | else | |
97 | clnp_protox[ISOPROTO_TP] = pr - isosw; | |
98 | ||
99 | /* | |
100 | * CLNL protox initialization | |
101 | */ | |
102 | clnl_protox[ISO8473_CLNP].clnl_input = clnp_input; | |
103 | ||
104 | clnlintrq.ifq_maxlen = clnpqmaxlen; | |
105 | } | |
106 | ||
107 | /* | |
108 | * FUNCTION: clnlintr | |
109 | * | |
110 | * PURPOSE: Process a packet on the clnl input queue | |
111 | * | |
112 | * RETURNS: nothing. | |
113 | * | |
114 | * SIDE EFFECTS: | |
115 | * | |
116 | * NOTES: | |
117 | */ | |
118 | clnlintr() | |
119 | { | |
120 | register struct mbuf *m; /* ptr to first mbuf of pkt */ | |
121 | register struct clnl_fixed *clnl; /* ptr to fixed part of clnl hdr */ | |
122 | struct ifnet *ifp; /* ptr to interface pkt arrived on */ | |
123 | int s; /* save and restore priority */ | |
124 | struct clnl_protosw *clnlsw;/* ptr to protocol switch */ | |
125 | struct snpa_hdr sh; /* subnetwork hdr */ | |
126 | ||
127 | /* | |
128 | * Get next datagram off clnl input queue | |
129 | */ | |
130 | next: | |
131 | s = splimp(); | |
132 | ||
133 | IF_DEQUEUESNPAHDR(&clnlintrq, m, sh); | |
134 | ||
135 | IFDEBUG(D_INPUT) | |
136 | int i; | |
137 | printf("clnlintr: src:"); | |
138 | for (i=0; i<6; i++) | |
139 | printf("%x%c", sh.snh_shost[i] & 0xff, (i<5) ? ':' : ' '); | |
140 | printf(" dst:"); | |
141 | for (i=0; i<6; i++) | |
142 | printf("%x%c", sh.snh_dhost[i] & 0xff, (i<5) ? ':' : ' '); | |
143 | printf("\n"); | |
144 | ENDDEBUG | |
145 | ||
146 | splx(s); | |
147 | if (m == 0) /* nothing to do */ | |
148 | return; | |
149 | ||
150 | /* | |
151 | * Get the fixed part of the clnl header into the first mbuf. | |
152 | * Drop the packet if this fails. | |
153 | * Do not call m_pullup if we have a cluster mbuf or the | |
154 | * data is not there. | |
155 | */ | |
156 | if ((IS_CLUSTER(m) || (m->m_len < sizeof(struct clnl_fixed))) && | |
157 | ((m = m_pullup(m, sizeof(struct clnl_fixed))) == 0)) { | |
158 | INCSTAT(cns_toosmall); /* TODO: use clnl stats */ | |
159 | goto next; /* m_pullup discards mbuf */ | |
160 | } | |
161 | ||
162 | clnl = mtod(m, struct clnl_fixed *); | |
163 | ||
164 | /* | |
165 | * Drop packet if the length of the header is not reasonable. | |
166 | */ | |
167 | if ((clnl->cnf_hdr_len < CLNP_HDR_MIN) || | |
168 | (clnl->cnf_hdr_len > CLNP_HDR_MAX)) { | |
169 | INCSTAT(cns_badhlen); /* TODO: use clnl stats */ | |
170 | m_freem(m); | |
171 | goto next; | |
172 | } | |
173 | ||
174 | /* | |
175 | * If the header is not contained in this mbuf, make it so. | |
176 | * Drop packet if this fails. | |
177 | * Note: m_pullup will allocate a cluster mbuf if necessary | |
178 | */ | |
179 | if (clnl->cnf_hdr_len > m->m_len) { | |
180 | if ((m = m_pullup(m, clnl->cnf_hdr_len)) == 0) { | |
181 | INCSTAT(cns_badhlen); /* TODO: use clnl stats */ | |
182 | goto next; /* m_pullup discards mbuf */ | |
183 | } | |
184 | clnl = mtod(m, struct clnl_fixed *); | |
185 | } | |
186 | ||
187 | clnlsw = &clnl_protox[clnl->cnf_proto_id]; | |
188 | ||
189 | ||
190 | if (clnlsw->clnl_input) | |
191 | (*clnlsw->clnl_input) (m, &sh); | |
192 | else | |
193 | m_freem(m); | |
194 | ||
195 | goto next; | |
196 | } | |
197 | ||
198 | /* | |
199 | * FUNCTION: clnp_input | |
200 | * | |
201 | * PURPOSE: process an incoming clnp packet | |
202 | * | |
203 | * RETURNS: nothing | |
204 | * | |
205 | * SIDE EFFECTS: increments fields of clnp_stat structure. | |
206 | * | |
207 | * NOTES: | |
208 | * TODO: I would like to make seg_part a pointer into the mbuf, but | |
209 | * will it be correctly aligned? | |
210 | */ | |
211 | int clnp_input(m, shp) | |
212 | struct mbuf *m; /* ptr to first mbuf of pkt */ | |
213 | struct snpa_hdr *shp; /* subnetwork header */ | |
214 | { | |
215 | register struct clnp_fixed *clnp; /* ptr to fixed part of header */ | |
216 | struct iso_addr src; /* source address of pkt */ | |
217 | struct iso_addr dst; /* destination address of pkt */ | |
218 | caddr_t hoff; /* current offset in packet */ | |
219 | caddr_t hend; /* address of end of header info */ | |
220 | struct clnp_segment seg_part; /* segment part of hdr */ | |
221 | int seg_off=0; /* offset of segment part of hdr */ | |
222 | int seg_len;/* length of packet data&hdr in bytes */ | |
223 | struct clnp_optidx oidx, *oidxp = NULL; /* option index */ | |
224 | extern int iso_systype; /* used by ESIS config resp */ | |
225 | ||
226 | IFDEBUG(D_INPUT) | |
227 | printf( | |
228 | "clnp_input: proccessing dg; First mbuf m_len %d, m_type x%x, data:\n", | |
229 | m->m_len, m->m_type); | |
230 | ENDDEBUG | |
231 | IFDEBUG(D_DUMPIN) | |
232 | printf("clnp_input: first mbuf:\n"); | |
233 | dump_buf(mtod(m, caddr_t), m->m_len); | |
234 | ENDDEBUG | |
235 | ||
236 | /* | |
237 | * If no iso addresses have been set, there is nothing | |
238 | * to do with the packet. | |
239 | */ | |
240 | if (iso_ifaddr == NULL) { | |
241 | clnp_discard(m, ADDR_DESTUNREACH); | |
242 | return; | |
243 | } | |
244 | ||
245 | INCSTAT(cns_total); | |
246 | clnp = mtod(m, struct clnp_fixed *); | |
247 | ||
248 | /* | |
249 | * Compute checksum (if necessary) and drop packet if | |
250 | * checksum does not match | |
251 | */ | |
252 | if (CKSUM_REQUIRED(clnp) && iso_check_csum(m, clnp->cnf_hdr_len)) { | |
253 | INCSTAT(cns_badcsum); | |
254 | clnp_discard(m, GEN_BADCSUM); | |
255 | return; | |
256 | } | |
257 | ||
258 | if (clnp->cnf_vers != ISO8473_V1) { | |
259 | INCSTAT(cns_badvers); | |
260 | clnp_discard(m, DISC_UNSUPPVERS); | |
261 | return; | |
262 | } | |
263 | ||
264 | ||
265 | /* check mbuf data length: clnp_data_ck will free mbuf upon error */ | |
266 | CTOH(clnp->cnf_seglen_msb, clnp->cnf_seglen_lsb, seg_len); | |
267 | if ((m = clnp_data_ck(m, seg_len)) == 0) | |
268 | return; | |
269 | ||
270 | clnp = mtod(m, struct clnp_fixed *); | |
271 | hend = (caddr_t)clnp + clnp->cnf_hdr_len; | |
272 | ||
273 | /* | |
274 | * extract the source and destination address | |
275 | * drop packet on failure | |
276 | */ | |
277 | bzero((caddr_t)&src, sizeof(src)); | |
278 | bzero((caddr_t)&dst, sizeof(dst)); | |
279 | ||
280 | hoff = (caddr_t)clnp + sizeof(struct clnp_fixed); | |
281 | CLNP_EXTRACT_ADDR(dst, hoff, hend); | |
282 | if (hoff == (caddr_t)0) { | |
283 | INCSTAT(cns_badaddr); | |
284 | clnp_discard(m, GEN_INCOMPLETE); | |
285 | return; | |
286 | } | |
287 | CLNP_EXTRACT_ADDR(src, hoff, hend); | |
288 | if (hoff == (caddr_t)0) { | |
289 | INCSTAT(cns_badaddr); | |
290 | clnp_discard(m, GEN_INCOMPLETE); | |
291 | return; | |
292 | } | |
293 | ||
294 | IFDEBUG(D_INPUT) | |
295 | printf("clnp_input: from %s", clnp_iso_addrp(&src)); | |
296 | printf(" to %s\n", clnp_iso_addrp(&dst)); | |
297 | ENDDEBUG | |
298 | ||
299 | /* | |
300 | * extract the segmentation information, if it is present. | |
301 | * drop packet on failure | |
302 | */ | |
303 | if ((clnp->cnf_type != CLNP_ER) && (clnp->cnf_seg_ok)) { | |
304 | if (hoff + sizeof(struct clnp_segment) > hend) { | |
305 | INCSTAT(cns_noseg); | |
306 | clnp_discard(m, GEN_INCOMPLETE); | |
307 | return; | |
308 | } else { | |
309 | (void) bcopy(hoff, (caddr_t)&seg_part, sizeof(struct clnp_segment)); | |
310 | /* make sure segmentation fields are in host order */ | |
311 | seg_part.cng_id = ntohs(seg_part.cng_id); | |
312 | seg_part.cng_off = ntohs(seg_part.cng_off); | |
313 | seg_part.cng_tot_len = ntohs(seg_part.cng_tot_len); | |
314 | seg_off = hoff - (caddr_t)clnp; | |
315 | hoff += sizeof(struct clnp_segment); | |
316 | } | |
317 | } | |
318 | ||
319 | /* | |
320 | * process options if present. If clnp_opt_sanity returns | |
321 | * false (indicating an error was found in the options) or | |
322 | * an unsupported option was found | |
323 | * then drop packet and emit an ER. | |
324 | */ | |
325 | if (hoff < hend) { | |
326 | int errcode; | |
327 | ||
328 | oidxp = &oidx; | |
329 | errcode = clnp_opt_sanity(m, hoff, hend-hoff, oidxp); | |
330 | ||
331 | /* we do not support security */ | |
332 | if ((errcode == 0) && (oidxp->cni_securep)) | |
333 | errcode = DISC_UNSUPPSECURE; | |
334 | ||
335 | /* the er option is valid with ER pdus only */ | |
336 | if ((errcode == 0) && (oidxp->cni_er_reason != ER_INVALREAS) && | |
337 | (clnp->cnf_type != CLNP_ER)) | |
338 | errcode = DISC_UNSUPPOPT; | |
339 | ||
340 | if (errcode != 0) { | |
341 | clnp_discard(m, (char)errcode); | |
342 | IFDEBUG(D_INPUT) | |
343 | printf("clnp_input: dropped (err x%x) due to bad options\n", | |
344 | errcode); | |
345 | ENDDEBUG | |
346 | return; | |
347 | } | |
348 | } | |
349 | ||
350 | /* | |
351 | * check if this packet is for us. if not, then forward | |
352 | */ | |
353 | if (clnp_ours(&dst) == 0) { | |
354 | IFDEBUG(D_INPUT) | |
355 | printf("clnp_input: forwarding packet not for us\n"); | |
356 | ENDDEBUG | |
357 | clnp_forward(m, seg_len, &dst, oidxp, seg_off, shp); | |
358 | return; | |
359 | } | |
360 | ||
361 | /* | |
362 | * ESIS Configuration Response Function | |
363 | * | |
364 | * If the packet received was sent to the multicast address | |
365 | * all end systems, then send an esh to the source | |
366 | */ | |
367 | if ((IS_MULTICAST(shp->snh_dhost)) && (iso_systype == SNPA_ES)) { | |
368 | extern short esis_holding_time; | |
369 | ||
370 | esis_shoutput(shp->snh_ifp, ESIS_ESH, esis_holding_time, | |
371 | shp->snh_shost, 6); | |
372 | } | |
373 | ||
374 | /* | |
375 | * If this is a fragment, then try to reassemble it. If clnp_reass | |
376 | * returns non NULL, the packet has been reassembled, and should | |
377 | * be give to TP. Otherwise the fragment has been delt with | |
378 | * by the reassembly code (either stored or deleted). In either case | |
379 | * we should have nothing more to do with it. | |
380 | */ | |
381 | if ((clnp->cnf_type != CLNP_ER) && (clnp->cnf_seg_ok) && | |
382 | (seg_len != seg_part.cng_tot_len)) { | |
383 | struct mbuf *m0; | |
384 | ||
385 | if ((m0 = clnp_reass(m, &src, &dst, &seg_part)) != NULL) { | |
386 | m = m0; | |
387 | clnp = mtod(m, struct clnp_fixed *); | |
388 | } else { | |
389 | return; | |
390 | } | |
391 | } | |
392 | ||
393 | /* | |
394 | * give the packet to the higher layer | |
395 | * TODO: how do we tell TP that congestion bit is on in QOS option? | |
396 | * | |
397 | * Note: the total length of packet | |
398 | * is the total length field of the segmentation part, | |
399 | * or, if absent, the segment length field of the | |
400 | * header. | |
401 | */ | |
402 | switch (clnp->cnf_type) { | |
403 | case CLNP_ER: | |
404 | /* | |
405 | * This ER must have the er option. | |
406 | * If the option is not present, discard datagram. | |
407 | */ | |
408 | if (oidxp == NULL || oidxp->cni_er_reason == ER_INVALREAS) { | |
409 | clnp_discard(m, GEN_HDRSYNTAX); | |
410 | } else { | |
411 | clnp_er_input(m, &src, oidxp->cni_er_reason); | |
412 | } | |
413 | break; | |
414 | ||
415 | case CLNP_DT: | |
416 | (*isosw[clnp_protox[ISOPROTO_TP]].pr_input)(m, &src, &dst, | |
417 | clnp->cnf_hdr_len); | |
418 | break; | |
419 | ||
420 | case CLNP_RAW: | |
421 | case CLNP_ECR: | |
422 | IFDEBUG(D_INPUT) | |
423 | printf("clnp_input: raw input of %d bytes\n", | |
424 | clnp->cnf_seg_ok ? seg_part.cng_tot_len : seg_len); | |
425 | ENDDEBUG | |
426 | (*isosw[clnp_protox[ISOPROTO_RAW]].pr_input)(m, &src, &dst, | |
427 | clnp->cnf_hdr_len); | |
428 | break; | |
429 | ||
430 | case CLNP_EC: | |
431 | IFDEBUG(D_INPUT) | |
432 | printf("clnp_input: echoing packet\n"); | |
433 | ENDDEBUG | |
434 | /* | |
435 | * Switch the source and destination address, | |
436 | */ | |
437 | hoff = (caddr_t)clnp + sizeof(struct clnp_fixed); | |
438 | CLNP_INSERT_ADDR(hoff, &src); | |
439 | CLNP_INSERT_ADDR(hoff, &dst); | |
440 | clnp->cnf_type = CLNP_ECR; | |
441 | ||
442 | /* | |
443 | * Forward back to sender | |
444 | */ | |
445 | clnp_forward(m, clnp->cnf_seg_ok ? seg_part.cng_tot_len : seg_len, | |
446 | &src, oidxp, seg_off, shp); | |
447 | break; | |
448 | ||
449 | default: | |
450 | printf("clnp_input: unknown clnp pkt type %d\n", clnp->cnf_type); | |
451 | clnp_discard(m, GEN_HDRSYNTAX); | |
452 | break; | |
453 | } | |
454 | } | |
455 | ||
456 | int clnp_ctlinput() | |
457 | { | |
458 | } | |
459 | ||
460 | #endif ISO |