Commit | Line | Data |
---|---|---|
8ae0e4b4 | 1 | /* |
d5678156 | 2 | * Copyright (c) 1984, 1988 Regents of the University of California. |
240edf1f | 3 | * All rights reserved. |
8ae0e4b4 | 4 | * |
240edf1f | 5 | * Redistribution and use in source and binary forms are permitted |
616d42db KB |
6 | * provided that the above copyright notice and this paragraph are |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
240edf1f | 16 | * |
4dcdd98e | 17 | * @(#)ns_error.c 7.7 (Berkeley) %G% |
8ae0e4b4 | 18 | */ |
bedb3747 KS |
19 | |
20 | #include "param.h" | |
21 | #include "systm.h" | |
4dcdd98e | 22 | #include "malloc.h" |
bedb3747 KS |
23 | #include "mbuf.h" |
24 | #include "protosw.h" | |
25 | #include "socket.h" | |
26 | #include "time.h" | |
27 | #include "kernel.h" | |
28 | ||
29 | #include "../net/route.h" | |
30 | ||
31 | #include "ns.h" | |
32 | #include "ns_pcb.h" | |
33 | #include "idp.h" | |
34 | #include "ns_error.h" | |
35 | ||
f97be0c9 KS |
36 | #ifdef lint |
37 | #define NS_ERRPRINTFS 1 | |
38 | #endif | |
39 | ||
bedb3747 KS |
40 | #ifdef NS_ERRPRINTFS |
41 | /* | |
42 | * NS_ERR routines: error generation, receive packet processing, and | |
233a75ef | 43 | * routines to turnaround packets back to the originator. |
bedb3747 KS |
44 | */ |
45 | int ns_errprintfs = 0; | |
46 | #endif | |
47 | ||
dc9ba710 | 48 | ns_err_x(c) |
d5678156 KS |
49 | { |
50 | register u_short *w, *lim, *base = ns_errstat.ns_es_codes; | |
51 | u_short x = c; | |
52 | ||
53 | /* | |
54 | * zero is a legit error code, handle specially | |
55 | */ | |
56 | if (x == 0) | |
57 | return (0); | |
58 | lim = base + NS_ERR_MAX - 1; | |
59 | for (w = base + 1; w < lim; w++) { | |
60 | if (*w == 0) | |
61 | *w = x; | |
62 | if (*w == x) | |
63 | break; | |
64 | } | |
65 | return (w - base); | |
66 | } | |
67 | ||
bedb3747 KS |
68 | /* |
69 | * Generate an error packet of type error | |
70 | * in response to bad packet. | |
71 | */ | |
72 | ||
73 | ns_error(om, type, param) | |
74 | struct mbuf *om; | |
75 | int type; | |
76 | { | |
77 | register struct ns_epidp *ep; | |
78 | struct mbuf *m; | |
79 | struct idp *nip; | |
80 | register struct idp *oip = mtod(om, struct idp *); | |
81 | extern int idpcksum; | |
82 | ||
233a75ef KS |
83 | /* |
84 | * If this packet was sent to the echo port, | |
85 | * and nobody was there, just echo it. | |
86 | * (Yes, this is a wart!) | |
87 | */ | |
4dcdd98e KS |
88 | if (type == NS_ERR_NOSOCK && |
89 | oip->idp_dna.x_port == htons(2) && | |
90 | (type = ns_echo(om))==0) | |
233a75ef KS |
91 | return; |
92 | ||
bedb3747 KS |
93 | #ifdef NS_ERRPRINTFS |
94 | if (ns_errprintfs) | |
95 | printf("ns_err_error(%x, %d, %d)\n", oip, type, param); | |
96 | #endif | |
9fa7f9e6 KS |
97 | /* |
98 | * Don't Generate error packets in response to multicasts. | |
99 | */ | |
100 | if (oip->idp_dna.x_host.c_host[0] & 1) | |
4dcdd98e | 101 | goto freeit; |
9fa7f9e6 | 102 | |
bedb3747 KS |
103 | ns_errstat.ns_es_error++; |
104 | /* | |
105 | * Make sure that the old IDP packet had 30 bytes of data to return; | |
106 | * if not, don't bother. Also don't EVER error if the old | |
107 | * packet protocol was NS_ERR. | |
108 | */ | |
109 | if (oip->idp_len < sizeof(struct idp)) { | |
110 | ns_errstat.ns_es_oldshort++; | |
4dcdd98e | 111 | goto freeit; |
bedb3747 KS |
112 | } |
113 | if (oip->idp_pt == NSPROTO_ERROR) { | |
114 | ns_errstat.ns_es_oldns_err++; | |
4dcdd98e | 115 | goto freeit; |
bedb3747 KS |
116 | } |
117 | ||
118 | /* | |
119 | * First, formulate ns_err message | |
120 | */ | |
4dcdd98e | 121 | m = m_gethdr(M_DONTWAIT, MT_HEADER); |
bedb3747 | 122 | if (m == NULL) |
4dcdd98e | 123 | goto freeit; |
bedb3747 | 124 | m->m_len = sizeof(*ep); |
4dcdd98e | 125 | MH_ALIGN(m, m->m_len); |
bedb3747 KS |
126 | ep = mtod(m, struct ns_epidp *); |
127 | if ((u_int)type > NS_ERR_TOO_BIG) | |
128 | panic("ns_err_error"); | |
129 | ns_errstat.ns_es_outhist[ns_err_x(type)]++; | |
f97be0c9 KS |
130 | ep->ns_ep_errp.ns_err_num = htons((u_short)type); |
131 | ep->ns_ep_errp.ns_err_param = htons((u_short)param); | |
bedb3747 KS |
132 | bcopy((caddr_t)oip, (caddr_t)&ep->ns_ep_errp.ns_err_idp, 42); |
133 | nip = &ep->ns_ep_idp; | |
134 | nip->idp_len = sizeof(*ep); | |
135 | nip->idp_len = htons((u_short)nip->idp_len); | |
136 | nip->idp_pt = NSPROTO_ERROR; | |
137 | nip->idp_tc = 0; | |
138 | nip->idp_dna = oip->idp_sna; | |
139 | nip->idp_sna = oip->idp_dna; | |
140 | if (idpcksum) { | |
141 | nip->idp_sum = 0; | |
4dcdd98e | 142 | nip->idp_sum = ns_cksum(m, sizeof(*ep)); |
bedb3747 KS |
143 | } else |
144 | nip->idp_sum = 0xffff; | |
4dcdd98e | 145 | (void) ns_output(m, (struct route *)0, 0); |
bedb3747 | 146 | |
4dcdd98e KS |
147 | freeit: |
148 | m_freem(om); | |
bedb3747 KS |
149 | } |
150 | ||
bedb3747 KS |
151 | ns_printhost(p) |
152 | register struct ns_addr *p; | |
153 | { | |
154 | ||
155 | printf("<net:%x%x,host:%x%x%x,port:%x>", | |
156 | p->x_net.s_net[0], | |
157 | p->x_net.s_net[1], | |
158 | p->x_host.s_host[0], | |
159 | p->x_host.s_host[1], | |
160 | p->x_host.s_host[2], | |
161 | p->x_port); | |
162 | ||
163 | } | |
164 | ||
165 | /* | |
166 | * Process a received NS_ERR message. | |
167 | */ | |
168 | ns_err_input(m) | |
169 | struct mbuf *m; | |
170 | { | |
171 | register struct ns_errp *ep; | |
172 | register struct ns_epidp *epidp = mtod(m, struct ns_epidp *); | |
173 | register int i; | |
174 | int type, code, param; | |
bedb3747 KS |
175 | |
176 | /* | |
177 | * Locate ns_err structure in mbuf, and check | |
178 | * that not corrupted and of at least minimum length. | |
179 | */ | |
180 | #ifdef NS_ERRPRINTFS | |
181 | if (ns_errprintfs) { | |
182 | printf("ns_err_input from "); | |
183 | ns_printhost(&epidp->ns_ep_idp.idp_sna); | |
184 | printf("len %d\n", ntohs(epidp->ns_ep_idp.idp_len)); | |
185 | } | |
186 | #endif | |
187 | i = sizeof (struct ns_epidp); | |
4dcdd98e | 188 | if (((m->m_flags & M_EXT) || m->m_len < i) && |
bedb3747 KS |
189 | (m = m_pullup(m, i)) == 0) { |
190 | ns_errstat.ns_es_tooshort++; | |
191 | return; | |
192 | } | |
193 | ep = &(mtod(m, struct ns_epidp *)->ns_ep_errp); | |
194 | type = ntohs(ep->ns_err_num); | |
195 | param = ntohs(ep->ns_err_param); | |
9fa7f9e6 | 196 | ns_errstat.ns_es_inhist[ns_err_x(type)]++; |
bedb3747 KS |
197 | |
198 | #ifdef NS_ERRPRINTFS | |
199 | /* | |
200 | * Message type specific processing. | |
201 | */ | |
202 | if (ns_errprintfs) | |
203 | printf("ns_err_input, type %d param %d\n", type, param); | |
204 | #endif | |
205 | if (type >= NS_ERR_TOO_BIG) { | |
206 | goto badcode; | |
207 | } | |
208 | ns_errstat.ns_es_outhist[ns_err_x(type)]++; | |
209 | switch (type) { | |
210 | ||
211 | case NS_ERR_UNREACH_HOST: | |
212 | code = PRC_UNREACH_NET; | |
213 | goto deliver; | |
214 | ||
215 | case NS_ERR_TOO_OLD: | |
216 | code = PRC_TIMXCEED_INTRANS; | |
217 | goto deliver; | |
218 | ||
219 | case NS_ERR_TOO_BIG: | |
220 | code = PRC_MSGSIZE; | |
221 | goto deliver; | |
222 | ||
223 | case NS_ERR_FULLUP: | |
224 | code = PRC_QUENCH; | |
225 | goto deliver; | |
226 | ||
227 | case NS_ERR_NOSOCK: | |
228 | code = PRC_UNREACH_PORT; | |
229 | goto deliver; | |
230 | ||
231 | case NS_ERR_UNSPEC_T: | |
232 | case NS_ERR_BADSUM_T: | |
233 | case NS_ERR_BADSUM: | |
234 | case NS_ERR_UNSPEC: | |
235 | code = PRC_PARAMPROB; | |
236 | goto deliver; | |
237 | ||
238 | deliver: | |
239 | /* | |
240 | * Problem with datagram; advise higher level routines. | |
241 | */ | |
242 | #ifdef NS_ERRPRINTFS | |
243 | if (ns_errprintfs) | |
244 | printf("deliver to protocol %d\n", | |
245 | ep->ns_err_idp.idp_pt); | |
246 | #endif | |
247 | switch(ep->ns_err_idp.idp_pt) { | |
248 | case NSPROTO_SPP: | |
249 | spp_ctlinput(code, (caddr_t)ep); | |
250 | break; | |
251 | ||
252 | default: | |
253 | idp_ctlinput(code, (caddr_t)ep); | |
254 | } | |
255 | ||
4dcdd98e | 256 | goto freeit; |
bedb3747 KS |
257 | |
258 | default: | |
259 | badcode: | |
260 | ns_errstat.ns_es_badcode++; | |
4dcdd98e | 261 | goto freeit; |
bedb3747 KS |
262 | |
263 | } | |
4dcdd98e | 264 | freeit: |
bedb3747 KS |
265 | m_freem(m); |
266 | } | |
233a75ef | 267 | |
58bca61d | 268 | #ifdef notdef |
bedb3747 KS |
269 | u_long |
270 | nstime() | |
271 | { | |
aaf09736 | 272 | int s = splclock(); |
bedb3747 KS |
273 | u_long t; |
274 | ||
275 | t = (time.tv_sec % (24*60*60)) * 1000 + time.tv_usec / 1000; | |
276 | splx(s); | |
277 | return (htonl(t)); | |
278 | } | |
58bca61d | 279 | #endif |
233a75ef | 280 | |
4dcdd98e KS |
281 | ns_echo(m) |
282 | struct mbuf *m; | |
233a75ef | 283 | { |
4dcdd98e | 284 | register struct idp *idp = mtod(m, struct idp *); |
233a75ef KS |
285 | register struct echo { |
286 | struct idp ec_idp; | |
287 | u_short ec_op; /* Operation, 1 = request, 2 = reply */ | |
288 | } *ec = (struct echo *)idp; | |
289 | struct ns_addr temp; | |
290 | ||
291 | if (idp->idp_pt!=NSPROTO_ECHO) return(NS_ERR_NOSOCK); | |
292 | if (ec->ec_op!=htons(1)) return(NS_ERR_UNSPEC); | |
293 | ||
294 | ec->ec_op = htons(2); | |
295 | ||
296 | temp = idp->idp_dna; | |
297 | idp->idp_dna = idp->idp_sna; | |
298 | idp->idp_sna = temp; | |
299 | ||
300 | if (idp->idp_sum != 0xffff) { | |
301 | idp->idp_sum = 0; | |
58bca61d MK |
302 | idp->idp_sum = ns_cksum(m, |
303 | (int)(((ntohs(idp->idp_len) - 1)|1)+1)); | |
233a75ef | 304 | } |
8011f5df | 305 | (void) ns_output(m, (struct route *)0, NS_FORWARDING); |
233a75ef KS |
306 | return(0); |
307 | } |