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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1984, 1988 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | * | |
42524852 | 33 | * from: @(#)ns_error.c 7.8 (Berkeley) 6/28/90 |
8ace4366 | 34 | * $Id: ns_error.c,v 1.3 1993/10/16 19:55:12 rgrimes Exp $ |
15637ed4 RG |
35 | */ |
36 | ||
37 | #include "param.h" | |
38 | #include "systm.h" | |
39 | #include "malloc.h" | |
40 | #include "mbuf.h" | |
41 | #include "protosw.h" | |
42 | #include "socket.h" | |
43 | #include "time.h" | |
44 | #include "kernel.h" | |
45 | ||
46 | #include "../net/route.h" | |
47 | ||
48 | #include "ns.h" | |
49 | #include "ns_pcb.h" | |
50 | #include "idp.h" | |
51 | #include "ns_error.h" | |
52 | ||
53 | #ifdef lint | |
54 | #define NS_ERRPRINTFS 1 | |
55 | #endif | |
56 | ||
8ace4366 GW |
57 | struct ns_errstat ns_errstat; |
58 | ||
15637ed4 RG |
59 | #ifdef NS_ERRPRINTFS |
60 | /* | |
61 | * NS_ERR routines: error generation, receive packet processing, and | |
62 | * routines to turnaround packets back to the originator. | |
63 | */ | |
64 | int ns_errprintfs = 0; | |
65 | #endif | |
66 | ||
67 | ns_err_x(c) | |
68 | { | |
69 | register u_short *w, *lim, *base = ns_errstat.ns_es_codes; | |
70 | u_short x = c; | |
71 | ||
72 | /* | |
73 | * zero is a legit error code, handle specially | |
74 | */ | |
75 | if (x == 0) | |
76 | return (0); | |
77 | lim = base + NS_ERR_MAX - 1; | |
78 | for (w = base + 1; w < lim; w++) { | |
79 | if (*w == 0) | |
80 | *w = x; | |
81 | if (*w == x) | |
82 | break; | |
83 | } | |
84 | return (w - base); | |
85 | } | |
86 | ||
87 | /* | |
88 | * Generate an error packet of type error | |
89 | * in response to bad packet. | |
90 | */ | |
91 | ||
92 | ns_error(om, type, param) | |
93 | struct mbuf *om; | |
94 | int type; | |
95 | { | |
96 | register struct ns_epidp *ep; | |
97 | struct mbuf *m; | |
98 | struct idp *nip; | |
99 | register struct idp *oip = mtod(om, struct idp *); | |
100 | extern int idpcksum; | |
101 | ||
102 | /* | |
103 | * If this packet was sent to the echo port, | |
104 | * and nobody was there, just echo it. | |
105 | * (Yes, this is a wart!) | |
106 | */ | |
107 | if (type == NS_ERR_NOSOCK && | |
108 | oip->idp_dna.x_port == htons(2) && | |
109 | (type = ns_echo(om))==0) | |
110 | return; | |
111 | ||
112 | #ifdef NS_ERRPRINTFS | |
113 | if (ns_errprintfs) | |
114 | printf("ns_err_error(%x, %d, %d)\n", oip, type, param); | |
115 | #endif | |
116 | /* | |
117 | * Don't Generate error packets in response to multicasts. | |
118 | */ | |
119 | if (oip->idp_dna.x_host.c_host[0] & 1) | |
120 | goto freeit; | |
121 | ||
122 | ns_errstat.ns_es_error++; | |
123 | /* | |
124 | * Make sure that the old IDP packet had 30 bytes of data to return; | |
125 | * if not, don't bother. Also don't EVER error if the old | |
126 | * packet protocol was NS_ERR. | |
127 | */ | |
128 | if (oip->idp_len < sizeof(struct idp)) { | |
129 | ns_errstat.ns_es_oldshort++; | |
130 | goto freeit; | |
131 | } | |
132 | if (oip->idp_pt == NSPROTO_ERROR) { | |
133 | ns_errstat.ns_es_oldns_err++; | |
134 | goto freeit; | |
135 | } | |
136 | ||
137 | /* | |
138 | * First, formulate ns_err message | |
139 | */ | |
140 | m = m_gethdr(M_DONTWAIT, MT_HEADER); | |
141 | if (m == NULL) | |
142 | goto freeit; | |
143 | m->m_len = sizeof(*ep); | |
144 | MH_ALIGN(m, m->m_len); | |
145 | ep = mtod(m, struct ns_epidp *); | |
146 | if ((u_int)type > NS_ERR_TOO_BIG) | |
147 | panic("ns_err_error"); | |
148 | ns_errstat.ns_es_outhist[ns_err_x(type)]++; | |
149 | ep->ns_ep_errp.ns_err_num = htons((u_short)type); | |
150 | ep->ns_ep_errp.ns_err_param = htons((u_short)param); | |
151 | bcopy((caddr_t)oip, (caddr_t)&ep->ns_ep_errp.ns_err_idp, 42); | |
152 | nip = &ep->ns_ep_idp; | |
153 | nip->idp_len = sizeof(*ep); | |
154 | nip->idp_len = htons((u_short)nip->idp_len); | |
155 | nip->idp_pt = NSPROTO_ERROR; | |
156 | nip->idp_tc = 0; | |
157 | nip->idp_dna = oip->idp_sna; | |
158 | nip->idp_sna = oip->idp_dna; | |
159 | if (idpcksum) { | |
160 | nip->idp_sum = 0; | |
161 | nip->idp_sum = ns_cksum(m, sizeof(*ep)); | |
162 | } else | |
163 | nip->idp_sum = 0xffff; | |
164 | (void) ns_output(m, (struct route *)0, 0); | |
165 | ||
166 | freeit: | |
167 | m_freem(om); | |
168 | } | |
169 | ||
170 | ns_printhost(p) | |
171 | register struct ns_addr *p; | |
172 | { | |
173 | ||
174 | printf("<net:%x%x,host:%x%x%x,port:%x>", | |
175 | p->x_net.s_net[0], | |
176 | p->x_net.s_net[1], | |
177 | p->x_host.s_host[0], | |
178 | p->x_host.s_host[1], | |
179 | p->x_host.s_host[2], | |
180 | p->x_port); | |
181 | ||
182 | } | |
183 | ||
184 | /* | |
185 | * Process a received NS_ERR message. | |
186 | */ | |
187 | ns_err_input(m) | |
188 | struct mbuf *m; | |
189 | { | |
190 | register struct ns_errp *ep; | |
191 | register struct ns_epidp *epidp = mtod(m, struct ns_epidp *); | |
192 | register int i; | |
193 | int type, code, param; | |
194 | ||
195 | /* | |
196 | * Locate ns_err structure in mbuf, and check | |
197 | * that not corrupted and of at least minimum length. | |
198 | */ | |
199 | #ifdef NS_ERRPRINTFS | |
200 | if (ns_errprintfs) { | |
201 | printf("ns_err_input from "); | |
202 | ns_printhost(&epidp->ns_ep_idp.idp_sna); | |
203 | printf("len %d\n", ntohs(epidp->ns_ep_idp.idp_len)); | |
204 | } | |
205 | #endif | |
206 | i = sizeof (struct ns_epidp); | |
207 | if (((m->m_flags & M_EXT) || m->m_len < i) && | |
208 | (m = m_pullup(m, i)) == 0) { | |
209 | ns_errstat.ns_es_tooshort++; | |
210 | return; | |
211 | } | |
212 | ep = &(mtod(m, struct ns_epidp *)->ns_ep_errp); | |
213 | type = ntohs(ep->ns_err_num); | |
214 | param = ntohs(ep->ns_err_param); | |
215 | ns_errstat.ns_es_inhist[ns_err_x(type)]++; | |
216 | ||
217 | #ifdef NS_ERRPRINTFS | |
218 | /* | |
219 | * Message type specific processing. | |
220 | */ | |
221 | if (ns_errprintfs) | |
222 | printf("ns_err_input, type %d param %d\n", type, param); | |
223 | #endif | |
224 | if (type >= NS_ERR_TOO_BIG) { | |
225 | goto badcode; | |
226 | } | |
227 | ns_errstat.ns_es_outhist[ns_err_x(type)]++; | |
228 | switch (type) { | |
229 | ||
230 | case NS_ERR_UNREACH_HOST: | |
231 | code = PRC_UNREACH_NET; | |
232 | goto deliver; | |
233 | ||
234 | case NS_ERR_TOO_OLD: | |
235 | code = PRC_TIMXCEED_INTRANS; | |
236 | goto deliver; | |
237 | ||
238 | case NS_ERR_TOO_BIG: | |
239 | code = PRC_MSGSIZE; | |
240 | goto deliver; | |
241 | ||
242 | case NS_ERR_FULLUP: | |
243 | code = PRC_QUENCH; | |
244 | goto deliver; | |
245 | ||
246 | case NS_ERR_NOSOCK: | |
247 | code = PRC_UNREACH_PORT; | |
248 | goto deliver; | |
249 | ||
250 | case NS_ERR_UNSPEC_T: | |
251 | case NS_ERR_BADSUM_T: | |
252 | case NS_ERR_BADSUM: | |
253 | case NS_ERR_UNSPEC: | |
254 | code = PRC_PARAMPROB; | |
255 | goto deliver; | |
256 | ||
257 | deliver: | |
258 | /* | |
259 | * Problem with datagram; advise higher level routines. | |
260 | */ | |
261 | #ifdef NS_ERRPRINTFS | |
262 | if (ns_errprintfs) | |
263 | printf("deliver to protocol %d\n", | |
264 | ep->ns_err_idp.idp_pt); | |
265 | #endif | |
266 | switch(ep->ns_err_idp.idp_pt) { | |
267 | case NSPROTO_SPP: | |
268 | spp_ctlinput(code, (caddr_t)ep); | |
269 | break; | |
270 | ||
271 | default: | |
272 | idp_ctlinput(code, (caddr_t)ep); | |
273 | } | |
274 | ||
275 | goto freeit; | |
276 | ||
277 | default: | |
278 | badcode: | |
279 | ns_errstat.ns_es_badcode++; | |
280 | goto freeit; | |
281 | ||
282 | } | |
283 | freeit: | |
284 | m_freem(m); | |
285 | } | |
286 | ||
287 | #ifdef notdef | |
288 | u_long | |
289 | nstime() | |
290 | { | |
291 | int s = splclock(); | |
292 | u_long t; | |
293 | ||
294 | t = (time.tv_sec % (24*60*60)) * 1000 + time.tv_usec / 1000; | |
295 | splx(s); | |
296 | return (htonl(t)); | |
297 | } | |
298 | #endif | |
299 | ||
300 | ns_echo(m) | |
301 | struct mbuf *m; | |
302 | { | |
303 | register struct idp *idp = mtod(m, struct idp *); | |
304 | register struct echo { | |
305 | struct idp ec_idp; | |
306 | u_short ec_op; /* Operation, 1 = request, 2 = reply */ | |
307 | } *ec = (struct echo *)idp; | |
308 | struct ns_addr temp; | |
309 | ||
310 | if (idp->idp_pt!=NSPROTO_ECHO) return(NS_ERR_NOSOCK); | |
311 | if (ec->ec_op!=htons(1)) return(NS_ERR_UNSPEC); | |
312 | ||
313 | ec->ec_op = htons(2); | |
314 | ||
315 | temp = idp->idp_dna; | |
316 | idp->idp_dna = idp->idp_sna; | |
317 | idp->idp_sna = temp; | |
318 | ||
319 | if (idp->idp_sum != 0xffff) { | |
320 | idp->idp_sum = 0; | |
321 | idp->idp_sum = ns_cksum(m, | |
322 | (int)(((ntohs(idp->idp_len) - 1)|1)+1)); | |
323 | } | |
324 | (void) ns_output(m, (struct route *)0, NS_FORWARDING); | |
325 | return(0); | |
326 | } |