Commit | Line | Data |
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233a75ef | 1 | /* ns_error.c 6.2 85/06/01 */ |
bedb3747 KS |
2 | |
3 | #include "param.h" | |
4 | #include "systm.h" | |
5 | #include "mbuf.h" | |
6 | #include "protosw.h" | |
7 | #include "socket.h" | |
8 | #include "time.h" | |
9 | #include "kernel.h" | |
10 | ||
11 | #include "../net/route.h" | |
12 | ||
13 | #include "ns.h" | |
14 | #include "ns_pcb.h" | |
15 | #include "idp.h" | |
16 | #include "ns_error.h" | |
17 | ||
bedb3747 KS |
18 | #ifdef NS_ERRPRINTFS |
19 | /* | |
20 | * NS_ERR routines: error generation, receive packet processing, and | |
233a75ef | 21 | * routines to turnaround packets back to the originator. |
bedb3747 KS |
22 | */ |
23 | int ns_errprintfs = 0; | |
24 | #endif | |
25 | ||
26 | /* | |
27 | * Generate an error packet of type error | |
28 | * in response to bad packet. | |
29 | */ | |
30 | ||
31 | ns_error(om, type, param) | |
32 | struct mbuf *om; | |
33 | int type; | |
34 | { | |
35 | register struct ns_epidp *ep; | |
36 | struct mbuf *m; | |
37 | struct idp *nip; | |
38 | register struct idp *oip = mtod(om, struct idp *); | |
39 | extern int idpcksum; | |
40 | ||
233a75ef KS |
41 | /* |
42 | * If this packet was sent to the echo port, | |
43 | * and nobody was there, just echo it. | |
44 | * (Yes, this is a wart!) | |
45 | */ | |
46 | if (type==NS_ERR_NOSOCK && | |
47 | oip->idp_dna.x_port==htons(2) && | |
48 | (type = ns_echo(oip)==0)) | |
49 | return; | |
50 | ||
bedb3747 KS |
51 | #ifdef NS_ERRPRINTFS |
52 | if (ns_errprintfs) | |
53 | printf("ns_err_error(%x, %d, %d)\n", oip, type, param); | |
54 | #endif | |
55 | ns_errstat.ns_es_error++; | |
56 | /* | |
57 | * Make sure that the old IDP packet had 30 bytes of data to return; | |
58 | * if not, don't bother. Also don't EVER error if the old | |
59 | * packet protocol was NS_ERR. | |
60 | */ | |
61 | if (oip->idp_len < sizeof(struct idp)) { | |
62 | ns_errstat.ns_es_oldshort++; | |
63 | goto free; | |
64 | } | |
65 | if (oip->idp_pt == NSPROTO_ERROR) { | |
66 | ns_errstat.ns_es_oldns_err++; | |
67 | goto free; | |
68 | } | |
69 | ||
70 | /* | |
71 | * First, formulate ns_err message | |
72 | */ | |
73 | m = m_get(M_DONTWAIT, MT_HEADER); | |
74 | if (m == NULL) | |
75 | goto free; | |
76 | m->m_len = sizeof(*ep); | |
77 | m->m_off = MMAXOFF - m->m_len; | |
78 | ep = mtod(m, struct ns_epidp *); | |
79 | if ((u_int)type > NS_ERR_TOO_BIG) | |
80 | panic("ns_err_error"); | |
81 | ns_errstat.ns_es_outhist[ns_err_x(type)]++; | |
82 | ep->ns_ep_errp.ns_err_num = htons(type); | |
83 | ep->ns_ep_errp.ns_err_param = htons(param); | |
84 | bcopy((caddr_t)oip, (caddr_t)&ep->ns_ep_errp.ns_err_idp, 42); | |
85 | nip = &ep->ns_ep_idp; | |
86 | nip->idp_len = sizeof(*ep); | |
87 | nip->idp_len = htons((u_short)nip->idp_len); | |
88 | nip->idp_pt = NSPROTO_ERROR; | |
89 | nip->idp_tc = 0; | |
90 | nip->idp_dna = oip->idp_sna; | |
91 | nip->idp_sna = oip->idp_dna; | |
92 | if (idpcksum) { | |
93 | nip->idp_sum = 0; | |
94 | nip->idp_sum = ns_cksum(dtom(nip), sizeof(*ep)); | |
95 | } else | |
96 | nip->idp_sum = 0xffff; | |
97 | ns_output(dtom(nip), (struct route *)0, 0); | |
98 | ||
99 | free: | |
100 | m_freem(dtom(oip)); | |
101 | } | |
102 | ||
103 | static struct sockproto ns_errroto = { AF_NS, NSPROTO_ERROR }; | |
104 | static struct sockaddr_ns ns_errsrc = { AF_NS }; | |
105 | static struct sockaddr_ns ns_errdst = { AF_NS }; | |
106 | ||
107 | ns_printhost(p) | |
108 | register struct ns_addr *p; | |
109 | { | |
110 | ||
111 | printf("<net:%x%x,host:%x%x%x,port:%x>", | |
112 | p->x_net.s_net[0], | |
113 | p->x_net.s_net[1], | |
114 | p->x_host.s_host[0], | |
115 | p->x_host.s_host[1], | |
116 | p->x_host.s_host[2], | |
117 | p->x_port); | |
118 | ||
119 | } | |
120 | ||
121 | /* | |
122 | * Process a received NS_ERR message. | |
123 | */ | |
124 | ns_err_input(m) | |
125 | struct mbuf *m; | |
126 | { | |
127 | register struct ns_errp *ep; | |
128 | register struct ns_epidp *epidp = mtod(m, struct ns_epidp *); | |
129 | register int i; | |
130 | int type, code, param; | |
131 | extern struct ns_addr if_makeaddr(); | |
132 | ||
133 | /* | |
134 | * Locate ns_err structure in mbuf, and check | |
135 | * that not corrupted and of at least minimum length. | |
136 | */ | |
137 | #ifdef NS_ERRPRINTFS | |
138 | if (ns_errprintfs) { | |
139 | printf("ns_err_input from "); | |
140 | ns_printhost(&epidp->ns_ep_idp.idp_sna); | |
141 | printf("len %d\n", ntohs(epidp->ns_ep_idp.idp_len)); | |
142 | } | |
143 | #endif | |
144 | i = sizeof (struct ns_epidp); | |
145 | if ((m->m_off > MMAXOFF || m->m_len < i) && | |
146 | (m = m_pullup(m, i)) == 0) { | |
147 | ns_errstat.ns_es_tooshort++; | |
148 | return; | |
149 | } | |
150 | ep = &(mtod(m, struct ns_epidp *)->ns_ep_errp); | |
151 | type = ntohs(ep->ns_err_num); | |
152 | param = ntohs(ep->ns_err_param); | |
153 | ||
154 | #ifdef NS_ERRPRINTFS | |
155 | /* | |
156 | * Message type specific processing. | |
157 | */ | |
158 | if (ns_errprintfs) | |
159 | printf("ns_err_input, type %d param %d\n", type, param); | |
160 | #endif | |
161 | if (type >= NS_ERR_TOO_BIG) { | |
162 | goto badcode; | |
163 | } | |
164 | ns_errstat.ns_es_outhist[ns_err_x(type)]++; | |
165 | switch (type) { | |
166 | ||
167 | case NS_ERR_UNREACH_HOST: | |
168 | code = PRC_UNREACH_NET; | |
169 | goto deliver; | |
170 | ||
171 | case NS_ERR_TOO_OLD: | |
172 | code = PRC_TIMXCEED_INTRANS; | |
173 | goto deliver; | |
174 | ||
175 | case NS_ERR_TOO_BIG: | |
176 | code = PRC_MSGSIZE; | |
177 | goto deliver; | |
178 | ||
179 | case NS_ERR_FULLUP: | |
180 | code = PRC_QUENCH; | |
181 | goto deliver; | |
182 | ||
183 | case NS_ERR_NOSOCK: | |
184 | code = PRC_UNREACH_PORT; | |
185 | goto deliver; | |
186 | ||
187 | case NS_ERR_UNSPEC_T: | |
188 | case NS_ERR_BADSUM_T: | |
189 | case NS_ERR_BADSUM: | |
190 | case NS_ERR_UNSPEC: | |
191 | code = PRC_PARAMPROB; | |
192 | goto deliver; | |
193 | ||
194 | deliver: | |
195 | /* | |
196 | * Problem with datagram; advise higher level routines. | |
197 | */ | |
198 | #ifdef NS_ERRPRINTFS | |
199 | if (ns_errprintfs) | |
200 | printf("deliver to protocol %d\n", | |
201 | ep->ns_err_idp.idp_pt); | |
202 | #endif | |
203 | switch(ep->ns_err_idp.idp_pt) { | |
204 | case NSPROTO_SPP: | |
205 | spp_ctlinput(code, (caddr_t)ep); | |
206 | break; | |
207 | ||
208 | default: | |
209 | idp_ctlinput(code, (caddr_t)ep); | |
210 | } | |
211 | ||
212 | goto free; | |
213 | ||
214 | default: | |
215 | badcode: | |
216 | ns_errstat.ns_es_badcode++; | |
217 | goto free; | |
218 | ||
219 | } | |
220 | free: | |
221 | m_freem(m); | |
222 | } | |
233a75ef | 223 | |
bedb3747 KS |
224 | u_long |
225 | nstime() | |
226 | { | |
227 | int s = spl6(); | |
228 | u_long t; | |
229 | ||
230 | t = (time.tv_sec % (24*60*60)) * 1000 + time.tv_usec / 1000; | |
231 | splx(s); | |
232 | return (htonl(t)); | |
233 | } | |
233a75ef KS |
234 | |
235 | ns_echo(idp) | |
236 | register struct idp *idp; | |
237 | { | |
238 | struct mbuf *m = dtom(idp); | |
239 | register struct echo { | |
240 | struct idp ec_idp; | |
241 | u_short ec_op; /* Operation, 1 = request, 2 = reply */ | |
242 | } *ec = (struct echo *)idp; | |
243 | struct ns_addr temp; | |
244 | ||
245 | if (idp->idp_pt!=NSPROTO_ECHO) return(NS_ERR_NOSOCK); | |
246 | if (ec->ec_op!=htons(1)) return(NS_ERR_UNSPEC); | |
247 | ||
248 | ec->ec_op = htons(2); | |
249 | ||
250 | temp = idp->idp_dna; | |
251 | idp->idp_dna = idp->idp_sna; | |
252 | idp->idp_sna = temp; | |
253 | ||
254 | if (idp->idp_sum != 0xffff) { | |
255 | idp->idp_sum = 0; | |
256 | idp->idp_sum = ns_cksum(m, (((ntohs(idp->idp_len) - 1)|1)+1)); | |
257 | } | |
258 | (void) ns_output(m, 0, NS_FORWARDING); | |
259 | return(0); | |
260 | } |