Commit | Line | Data |
---|---|---|
011444fe 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 | */ | |
69ee739d KS |
27 | /* $Header: /var/src/sys/netiso/RCS/clnp_er.c,v 5.1 89/02/09 16:20:18 hagens Exp $ */ |
28 | /* $Source: /var/src/sys/netiso/RCS/clnp_er.c,v $ */ | |
011444fe KS |
29 | |
30 | #ifndef lint | |
69ee739d | 31 | static char *rcsid = "$Header: /var/src/sys/netiso/RCS/clnp_er.c,v 5.1 89/02/09 16:20:18 hagens Exp $"; |
011444fe 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" | |
011444fe KS |
44 | |
45 | #include "../net/if.h" | |
46 | #include "../net/route.h" | |
47 | ||
a50e2bc0 KS |
48 | #include "iso.h" |
49 | #include "iso_var.h" | |
50 | #include "iso_pcb.h" | |
51 | #include "clnp.h" | |
52 | #include "clnp_stat.h" | |
53 | #include "argo_debug.h" | |
011444fe KS |
54 | |
55 | static struct clnp_fixed er_template = { | |
56 | ISO8473_CLNP, /* network identifier */ | |
57 | 0, /* length */ | |
58 | ISO8473_V1, /* version */ | |
59 | CLNP_TTL, /* ttl */ | |
011444fe | 60 | CLNP_ER, /* type */ |
011444fe KS |
61 | 0, /* segment length */ |
62 | 0 /* checksum */ | |
63 | }; | |
64 | ||
65 | /* | |
66 | * FUNCTION: clnp_er_input | |
67 | * | |
68 | * PURPOSE: Process an ER pdu. | |
69 | * | |
70 | * RETURNS: | |
71 | * | |
72 | * SIDE EFFECTS: | |
73 | * | |
74 | * NOTES: | |
75 | */ | |
76 | clnp_er_input(m, src, reason) | |
77 | struct mbuf *m; /* ptr to packet itself */ | |
78 | struct iso_addr *src; /* ptr to src of er */ | |
a50e2bc0 | 79 | u_char reason; /* reason code of er */ |
011444fe KS |
80 | { |
81 | int cmd = -1; | |
82 | extern u_char clnp_protox[]; | |
83 | ||
84 | IFDEBUG(D_CTLINPUT) | |
85 | printf("clnp_er_input: m x%x, src %s, reason x%x\n", m, | |
86 | clnp_iso_addrp(src), reason); | |
87 | ENDDEBUG | |
88 | ||
89 | INCSTAT(cns_errcvd); | |
90 | ||
91 | switch (reason) { | |
92 | case GEN_NOREAS: | |
93 | case GEN_PROTOERR: | |
94 | INCSTAT(er_protoerr); | |
95 | break; | |
96 | case GEN_BADCSUM: | |
97 | cmd = PRC_PARAMPROB; | |
98 | INCSTAT(er_badcsum); | |
99 | break; | |
100 | case GEN_CONGEST: | |
101 | cmd = PRC_QUENCH; | |
102 | INCSTAT(er_congest); | |
103 | break; | |
104 | case GEN_HDRSYNTAX: | |
105 | cmd = PRC_PARAMPROB; | |
106 | INCSTAT(er_protoerr); | |
107 | break; | |
108 | case GEN_SEGNEEDED: | |
109 | cmd = PRC_UNREACH_NEEDFRAG; | |
110 | INCSTAT(er_segneeded); | |
111 | break; | |
112 | case GEN_INCOMPLETE: | |
113 | cmd = PRC_PARAMPROB; | |
114 | INCSTAT(er_reassfail); | |
115 | break; | |
116 | case GEN_DUPOPT: | |
117 | cmd = PRC_PARAMPROB; | |
118 | INCSTAT(er_protoerr); | |
119 | break; | |
120 | case ADDR_DESTUNREACH: | |
121 | cmd = PRC_UNREACH_HOST; | |
122 | INCSTAT(er_dstunreach); | |
123 | break; | |
124 | case ADDR_DESTUNKNOWN: | |
125 | cmd = PRC_UNREACH_PROTOCOL; | |
126 | INCSTAT(er_dstunreach); | |
127 | break; | |
128 | case SRCRT_UNSPECERR: | |
129 | case SRCRT_SYNTAX: | |
130 | case SRCRT_UNKNOWNADDR: | |
131 | case SRCRT_BADPATH: | |
132 | cmd = PRC_UNREACH_SRCFAIL; | |
133 | INCSTAT(er_srcrterr); | |
134 | break; | |
135 | case TTL_EXPTRANSIT: | |
136 | cmd = PRC_TIMXCEED_INTRANS; | |
137 | INCSTAT(er_ttlexpired); | |
138 | break; | |
139 | case TTL_EXPREASS: | |
140 | cmd = PRC_TIMXCEED_REASS; | |
141 | INCSTAT(er_ttlexpired); | |
142 | break; | |
143 | case DISC_UNSUPPOPT: | |
144 | case DISC_UNSUPPVERS: | |
145 | case DISC_UNSUPPSECURE: | |
146 | case DISC_UNSUPPSRCRT: | |
147 | case DISC_UNSUPPRECRT: | |
148 | cmd = PRC_PARAMPROB; | |
149 | INCSTAT(er_unsupported); | |
150 | break; | |
151 | case REASS_INTERFERE: | |
152 | cmd = PRC_TIMXCEED_REASS; | |
153 | INCSTAT(er_reassfail); | |
154 | break; | |
155 | } | |
156 | ||
69ee739d KS |
157 | /* |
158 | * tpclnp_ctlinput1 is called directly so that we don't | |
159 | * have to build an iso_sockaddr out of src. | |
160 | */ | |
011444fe | 161 | if (cmd >= 0) |
69ee739d | 162 | tpclnp_ctlinput1(cmd, src); |
011444fe KS |
163 | |
164 | m_freem(m); | |
165 | } | |
166 | ||
167 | /* | |
168 | * FUNCTION: clnp_discard | |
169 | * | |
170 | * PURPOSE: Discard a clnp datagram | |
171 | * | |
172 | * RETURNS: nothing | |
173 | * | |
174 | * SIDE EFFECTS: Will emit an ER pdu if possible | |
175 | * | |
176 | * NOTES: This code assumes that we have previously tried to pull | |
177 | * up the header of the datagram into one mbuf. | |
178 | */ | |
179 | clnp_discard(m, reason) | |
180 | struct mbuf *m; /* header of packet to discard */ | |
181 | char reason; /* reason for discard */ | |
182 | { | |
183 | IFDEBUG(D_DISCARD) | |
184 | printf("clnp_discard: m x%x, reason x%x\n", m, reason); | |
185 | ENDDEBUG | |
186 | ||
187 | if (m != NULL) { | |
188 | if (m->m_len >= sizeof(struct clnp_fixed)) { | |
189 | register struct clnp_fixed *clnp = mtod(m, struct clnp_fixed *); | |
190 | ||
a50e2bc0 KS |
191 | if (((clnp->cnf_type & CNF_TYPE) != CLNP_ER) && |
192 | (clnp->cnf_type & CNF_ERR_OK)) { | |
193 | clnp_emit_er(m, reason); | |
194 | return; | |
011444fe KS |
195 | } |
196 | } | |
197 | m_freem(m); | |
198 | } | |
199 | } | |
200 | ||
201 | /* | |
202 | * FUNCTION: clnp_emit_er | |
203 | * | |
204 | * PURPOSE: Send an ER pdu. | |
205 | * The src of the of the ER pdu is the host that is sending | |
206 | * the ER (ie. us), *not* the original destination of the | |
207 | * packet. | |
208 | * | |
209 | * RETURNS: nothing | |
210 | * | |
211 | * SIDE EFFECTS: | |
212 | * | |
213 | * NOTES: Takes responsibility for freeing mbuf passed | |
214 | * This function may be called with a packet that | |
215 | * was created by us; in this case, do not send | |
216 | * an ER. | |
217 | */ | |
218 | clnp_emit_er(m, reason) | |
219 | struct mbuf *m; /* header of packet to discard */ | |
220 | char reason; /* reason for discard */ | |
221 | { | |
222 | register struct clnp_fixed *clnp = mtod(m, struct clnp_fixed *); | |
223 | register struct clnp_fixed *er; | |
a50e2bc0 | 224 | struct route_iso route; |
011444fe KS |
225 | struct ifnet *ifp; |
226 | struct sockaddr *first_hop; | |
227 | struct iso_addr src, dst, *our_addr; | |
228 | caddr_t hoff, hend; | |
229 | int total_len; /* total len of dg */ | |
230 | struct mbuf *m0; /* contains er pdu hdr */ | |
a50e2bc0 | 231 | struct iso_ifaddr *ia = 0; |
011444fe KS |
232 | |
233 | IFDEBUG(D_DISCARD) | |
234 | printf("clnp_emit_er: m x%x, hdr len %d\n", m, clnp->cnf_hdr_len); | |
235 | ENDDEBUG | |
236 | ||
237 | bzero((caddr_t)&route, sizeof(route)); | |
238 | ||
239 | /* | |
240 | * If header length is incorrect, or entire header is not contained | |
241 | * in this mbuf, we punt | |
242 | */ | |
243 | if ((clnp->cnf_hdr_len < CLNP_HDR_MIN) || | |
244 | (clnp->cnf_hdr_len > CLNP_HDR_MAX) || | |
245 | (clnp->cnf_hdr_len > m->m_len)) | |
246 | goto bad; | |
247 | ||
248 | /* extract src, dest address */ | |
249 | hend = (caddr_t)clnp + clnp->cnf_hdr_len; | |
250 | hoff = (caddr_t)clnp + sizeof(struct clnp_fixed); | |
251 | CLNP_EXTRACT_ADDR(dst, hoff, hend); | |
252 | if (hoff == (caddr_t)0) { | |
253 | goto bad; | |
254 | } | |
255 | CLNP_EXTRACT_ADDR(src, hoff, hend); | |
256 | if (hoff == (caddr_t)0) { | |
257 | goto bad; | |
258 | } | |
259 | ||
260 | /* | |
261 | * Do not send ER if we generated the packet. | |
262 | */ | |
263 | if (clnp_ours(&src)) | |
264 | goto bad; | |
265 | ||
266 | /* | |
267 | * Trim mbuf to hold only the header. | |
268 | * This mbuf will be the 'data' of the er pdu | |
269 | */ | |
270 | if (m->m_next != NULL) { | |
271 | m_freem(m->m_next); | |
272 | m->m_next = NULL; | |
273 | } | |
274 | ||
275 | if (m->m_len > clnp->cnf_hdr_len) | |
a50e2bc0 | 276 | m_adj(m, (int)-(m->m_len - (int)clnp->cnf_hdr_len)); |
011444fe KS |
277 | |
278 | /* route er pdu: note we send pkt to src of original packet */ | |
a50e2bc0 | 279 | if (clnp_route(&src, &route, /* flags */0, &first_hop, &ia) != 0) |
011444fe KS |
280 | goto bad; |
281 | ||
282 | /* compute our address based upon firsthop/ifp */ | |
a50e2bc0 KS |
283 | if (ia) |
284 | our_addr = &ia->ia_addr.siso_addr; | |
285 | else | |
286 | goto bad; | |
287 | ifp = ia->ia_ifp; | |
011444fe KS |
288 | |
289 | IFDEBUG(D_DISCARD) | |
290 | printf("clnp_emit_er: to %s", clnp_iso_addrp(&src)); | |
291 | printf(" from %s\n", clnp_iso_addrp(our_addr)); | |
292 | ENDDEBUG | |
293 | ||
294 | IFDEBUG(D_DISCARD) | |
295 | printf("clnp_emit_er: packet routed to %s\n", | |
296 | clnp_iso_addrp(&((struct sockaddr_iso *)first_hop)->siso_addr)); | |
297 | ENDDEBUG | |
298 | ||
299 | /* allocate mbuf for er pdu header: punt on no space */ | |
300 | MGET(m0, M_DONTWAIT, MT_HEADER); | |
301 | if (m0 == 0) | |
302 | goto bad; | |
303 | ||
304 | m0->m_next = m; | |
305 | er = mtod(m0, struct clnp_fixed *); | |
306 | *er = er_template; | |
307 | ||
308 | /* setup src/dst on er pdu */ | |
309 | /* NOTE REVERSAL OF SRC/DST */ | |
310 | hoff = (caddr_t)er + sizeof(struct clnp_fixed); | |
a50e2bc0 KS |
311 | CLNP_INSERT_ADDR(hoff, src); |
312 | CLNP_INSERT_ADDR(hoff, *our_addr); | |
011444fe KS |
313 | |
314 | /* | |
315 | * TODO: if complete src rt was specified, then reverse path, and | |
316 | * copy into er as option. | |
317 | */ | |
318 | ||
319 | /* add er option */ | |
320 | *hoff++ = CLNPOVAL_ERREAS; /* code */ | |
321 | *hoff++ = 2; /* length */ | |
322 | *hoff++ = reason; /* discard reason */ | |
323 | *hoff++ = 0; /* error localization = not specified */ | |
324 | ||
325 | /* set length */ | |
326 | er->cnf_hdr_len = m0->m_len = (u_char)(hoff - (caddr_t)er); | |
327 | total_len = m0->m_len + m->m_len; | |
328 | HTOC(er->cnf_seglen_msb, er->cnf_seglen_lsb, total_len); | |
329 | ||
330 | /* compute checksum (on header only) */ | |
331 | iso_gen_csum(m0, CLNP_CKSUM_OFF, (int)er->cnf_hdr_len); | |
332 | ||
333 | /* trim packet if too large for interface */ | |
334 | if (total_len > ifp->if_mtu) | |
335 | m_adj(m0, -(total_len - ifp->if_mtu)); | |
336 | ||
337 | /* send packet */ | |
338 | (void) (*ifp->if_output)(ifp, m0, first_hop); | |
339 | goto done; | |
340 | ||
341 | bad: | |
342 | m_freem(m); | |
343 | ||
344 | done: | |
345 | /* free route if it is a temp */ | |
346 | if (route.ro_rt != NULL) | |
347 | RTFREE(route.ro_rt); | |
348 | } | |
349 | #endif ISO |