Commit | Line | Data |
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8ae0e4b4 | 1 | /* |
240edf1f KS |
2 | * Copyright (c) 1984, 1985, 1986, 1987 Regents of the University of California. |
3 | * All rights reserved. | |
8ae0e4b4 | 4 | * |
240edf1f KS |
5 | * Redistribution and use in source and binary forms are permitted |
6 | * provided that this notice is preserved and that due credit is given | |
7 | * to the University of California at Berkeley. The name of the University | |
8 | * may not be used to endorse or promote products derived from this | |
9 | * software without specific prior written permission. This software | |
10 | * is provided ``as is'' without express or implied warranty. | |
11 | * | |
12 | * @(#)ns_error.c 7.3 (Berkeley) %G% | |
8ae0e4b4 | 13 | */ |
bedb3747 KS |
14 | |
15 | #include "param.h" | |
16 | #include "systm.h" | |
17 | #include "mbuf.h" | |
18 | #include "protosw.h" | |
19 | #include "socket.h" | |
20 | #include "time.h" | |
21 | #include "kernel.h" | |
22 | ||
23 | #include "../net/route.h" | |
24 | ||
25 | #include "ns.h" | |
26 | #include "ns_pcb.h" | |
27 | #include "idp.h" | |
28 | #include "ns_error.h" | |
29 | ||
f97be0c9 KS |
30 | #ifdef lint |
31 | #define NS_ERRPRINTFS 1 | |
32 | #endif | |
33 | ||
bedb3747 KS |
34 | #ifdef NS_ERRPRINTFS |
35 | /* | |
36 | * NS_ERR routines: error generation, receive packet processing, and | |
233a75ef | 37 | * routines to turnaround packets back to the originator. |
bedb3747 KS |
38 | */ |
39 | int ns_errprintfs = 0; | |
40 | #endif | |
41 | ||
42 | /* | |
43 | * Generate an error packet of type error | |
44 | * in response to bad packet. | |
45 | */ | |
46 | ||
47 | ns_error(om, type, param) | |
48 | struct mbuf *om; | |
49 | int type; | |
50 | { | |
51 | register struct ns_epidp *ep; | |
52 | struct mbuf *m; | |
53 | struct idp *nip; | |
54 | register struct idp *oip = mtod(om, struct idp *); | |
55 | extern int idpcksum; | |
56 | ||
233a75ef KS |
57 | /* |
58 | * If this packet was sent to the echo port, | |
59 | * and nobody was there, just echo it. | |
60 | * (Yes, this is a wart!) | |
61 | */ | |
62 | if (type==NS_ERR_NOSOCK && | |
63 | oip->idp_dna.x_port==htons(2) && | |
64 | (type = ns_echo(oip)==0)) | |
65 | return; | |
66 | ||
bedb3747 KS |
67 | #ifdef NS_ERRPRINTFS |
68 | if (ns_errprintfs) | |
69 | printf("ns_err_error(%x, %d, %d)\n", oip, type, param); | |
70 | #endif | |
9fa7f9e6 KS |
71 | /* |
72 | * Don't Generate error packets in response to multicasts. | |
73 | */ | |
74 | if (oip->idp_dna.x_host.c_host[0] & 1) | |
75 | goto free; | |
76 | ||
bedb3747 KS |
77 | ns_errstat.ns_es_error++; |
78 | /* | |
79 | * Make sure that the old IDP packet had 30 bytes of data to return; | |
80 | * if not, don't bother. Also don't EVER error if the old | |
81 | * packet protocol was NS_ERR. | |
82 | */ | |
83 | if (oip->idp_len < sizeof(struct idp)) { | |
84 | ns_errstat.ns_es_oldshort++; | |
85 | goto free; | |
86 | } | |
87 | if (oip->idp_pt == NSPROTO_ERROR) { | |
88 | ns_errstat.ns_es_oldns_err++; | |
89 | goto free; | |
90 | } | |
91 | ||
92 | /* | |
93 | * First, formulate ns_err message | |
94 | */ | |
95 | m = m_get(M_DONTWAIT, MT_HEADER); | |
96 | if (m == NULL) | |
97 | goto free; | |
98 | m->m_len = sizeof(*ep); | |
99 | m->m_off = MMAXOFF - m->m_len; | |
100 | ep = mtod(m, struct ns_epidp *); | |
101 | if ((u_int)type > NS_ERR_TOO_BIG) | |
102 | panic("ns_err_error"); | |
103 | ns_errstat.ns_es_outhist[ns_err_x(type)]++; | |
f97be0c9 KS |
104 | ep->ns_ep_errp.ns_err_num = htons((u_short)type); |
105 | ep->ns_ep_errp.ns_err_param = htons((u_short)param); | |
bedb3747 KS |
106 | bcopy((caddr_t)oip, (caddr_t)&ep->ns_ep_errp.ns_err_idp, 42); |
107 | nip = &ep->ns_ep_idp; | |
108 | nip->idp_len = sizeof(*ep); | |
109 | nip->idp_len = htons((u_short)nip->idp_len); | |
110 | nip->idp_pt = NSPROTO_ERROR; | |
111 | nip->idp_tc = 0; | |
112 | nip->idp_dna = oip->idp_sna; | |
113 | nip->idp_sna = oip->idp_dna; | |
114 | if (idpcksum) { | |
115 | nip->idp_sum = 0; | |
116 | nip->idp_sum = ns_cksum(dtom(nip), sizeof(*ep)); | |
117 | } else | |
118 | nip->idp_sum = 0xffff; | |
f97be0c9 | 119 | (void) ns_output(dtom(nip), (struct route *)0, 0); |
bedb3747 KS |
120 | |
121 | free: | |
122 | m_freem(dtom(oip)); | |
123 | } | |
124 | ||
bedb3747 KS |
125 | ns_printhost(p) |
126 | register struct ns_addr *p; | |
127 | { | |
128 | ||
129 | printf("<net:%x%x,host:%x%x%x,port:%x>", | |
130 | p->x_net.s_net[0], | |
131 | p->x_net.s_net[1], | |
132 | p->x_host.s_host[0], | |
133 | p->x_host.s_host[1], | |
134 | p->x_host.s_host[2], | |
135 | p->x_port); | |
136 | ||
137 | } | |
138 | ||
139 | /* | |
140 | * Process a received NS_ERR message. | |
141 | */ | |
142 | ns_err_input(m) | |
143 | struct mbuf *m; | |
144 | { | |
145 | register struct ns_errp *ep; | |
146 | register struct ns_epidp *epidp = mtod(m, struct ns_epidp *); | |
147 | register int i; | |
148 | int type, code, param; | |
bedb3747 KS |
149 | |
150 | /* | |
151 | * Locate ns_err structure in mbuf, and check | |
152 | * that not corrupted and of at least minimum length. | |
153 | */ | |
154 | #ifdef NS_ERRPRINTFS | |
155 | if (ns_errprintfs) { | |
156 | printf("ns_err_input from "); | |
157 | ns_printhost(&epidp->ns_ep_idp.idp_sna); | |
158 | printf("len %d\n", ntohs(epidp->ns_ep_idp.idp_len)); | |
159 | } | |
160 | #endif | |
161 | i = sizeof (struct ns_epidp); | |
162 | if ((m->m_off > MMAXOFF || m->m_len < i) && | |
163 | (m = m_pullup(m, i)) == 0) { | |
164 | ns_errstat.ns_es_tooshort++; | |
165 | return; | |
166 | } | |
167 | ep = &(mtod(m, struct ns_epidp *)->ns_ep_errp); | |
168 | type = ntohs(ep->ns_err_num); | |
169 | param = ntohs(ep->ns_err_param); | |
9fa7f9e6 | 170 | ns_errstat.ns_es_inhist[ns_err_x(type)]++; |
bedb3747 KS |
171 | |
172 | #ifdef NS_ERRPRINTFS | |
173 | /* | |
174 | * Message type specific processing. | |
175 | */ | |
176 | if (ns_errprintfs) | |
177 | printf("ns_err_input, type %d param %d\n", type, param); | |
178 | #endif | |
179 | if (type >= NS_ERR_TOO_BIG) { | |
180 | goto badcode; | |
181 | } | |
182 | ns_errstat.ns_es_outhist[ns_err_x(type)]++; | |
183 | switch (type) { | |
184 | ||
185 | case NS_ERR_UNREACH_HOST: | |
186 | code = PRC_UNREACH_NET; | |
187 | goto deliver; | |
188 | ||
189 | case NS_ERR_TOO_OLD: | |
190 | code = PRC_TIMXCEED_INTRANS; | |
191 | goto deliver; | |
192 | ||
193 | case NS_ERR_TOO_BIG: | |
194 | code = PRC_MSGSIZE; | |
195 | goto deliver; | |
196 | ||
197 | case NS_ERR_FULLUP: | |
198 | code = PRC_QUENCH; | |
199 | goto deliver; | |
200 | ||
201 | case NS_ERR_NOSOCK: | |
202 | code = PRC_UNREACH_PORT; | |
203 | goto deliver; | |
204 | ||
205 | case NS_ERR_UNSPEC_T: | |
206 | case NS_ERR_BADSUM_T: | |
207 | case NS_ERR_BADSUM: | |
208 | case NS_ERR_UNSPEC: | |
209 | code = PRC_PARAMPROB; | |
210 | goto deliver; | |
211 | ||
212 | deliver: | |
213 | /* | |
214 | * Problem with datagram; advise higher level routines. | |
215 | */ | |
216 | #ifdef NS_ERRPRINTFS | |
217 | if (ns_errprintfs) | |
218 | printf("deliver to protocol %d\n", | |
219 | ep->ns_err_idp.idp_pt); | |
220 | #endif | |
221 | switch(ep->ns_err_idp.idp_pt) { | |
222 | case NSPROTO_SPP: | |
223 | spp_ctlinput(code, (caddr_t)ep); | |
224 | break; | |
225 | ||
226 | default: | |
227 | idp_ctlinput(code, (caddr_t)ep); | |
228 | } | |
229 | ||
230 | goto free; | |
231 | ||
232 | default: | |
233 | badcode: | |
234 | ns_errstat.ns_es_badcode++; | |
235 | goto free; | |
236 | ||
237 | } | |
238 | free: | |
239 | m_freem(m); | |
240 | } | |
233a75ef | 241 | |
58bca61d | 242 | #ifdef notdef |
bedb3747 KS |
243 | u_long |
244 | nstime() | |
245 | { | |
aaf09736 | 246 | int s = splclock(); |
bedb3747 KS |
247 | u_long t; |
248 | ||
249 | t = (time.tv_sec % (24*60*60)) * 1000 + time.tv_usec / 1000; | |
250 | splx(s); | |
251 | return (htonl(t)); | |
252 | } | |
58bca61d | 253 | #endif |
233a75ef KS |
254 | |
255 | ns_echo(idp) | |
256 | register struct idp *idp; | |
257 | { | |
258 | struct mbuf *m = dtom(idp); | |
259 | register struct echo { | |
260 | struct idp ec_idp; | |
261 | u_short ec_op; /* Operation, 1 = request, 2 = reply */ | |
262 | } *ec = (struct echo *)idp; | |
263 | struct ns_addr temp; | |
264 | ||
265 | if (idp->idp_pt!=NSPROTO_ECHO) return(NS_ERR_NOSOCK); | |
266 | if (ec->ec_op!=htons(1)) return(NS_ERR_UNSPEC); | |
267 | ||
268 | ec->ec_op = htons(2); | |
269 | ||
270 | temp = idp->idp_dna; | |
271 | idp->idp_dna = idp->idp_sna; | |
272 | idp->idp_sna = temp; | |
273 | ||
274 | if (idp->idp_sum != 0xffff) { | |
275 | idp->idp_sum = 0; | |
58bca61d MK |
276 | idp->idp_sum = ns_cksum(m, |
277 | (int)(((ntohs(idp->idp_len) - 1)|1)+1)); | |
233a75ef | 278 | } |
8011f5df | 279 | (void) ns_output(m, (struct route *)0, NS_FORWARDING); |
233a75ef KS |
280 | return(0); |
281 | } |