2 * Copyright (c) 1984, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
33 * @(#)ns_error.c 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: src/sys/netns/ns_error.c,v 1.9 1999/08/28 00:49:49 peter Exp $
35 * $DragonFly: src/sys/netproto/ns/ns_error.c,v 1.6 2004/01/30 05:42:17 dillon Exp $
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/malloc.h>
42 #include <sys/protosw.h>
43 #include <sys/socket.h>
45 #include <sys/kernel.h>
47 #include <net/route.h>
54 extern int idpchsum; /* from ns_input.c */
55 extern void spp_ctlinput( int, caddr_t); /* from spp_usrreq.c XXX */
58 #define NS_ERRPRINTFS 1
63 * NS_ERR routines: error generation, receive packet processing, and
64 * routines to turnaround packets back to the originator.
66 int ns_errprintfs = 0;
73 u_short *w, *lim, *base = ns_errstat.ns_es_codes;
77 * zero is a legit error code, handle specially
81 lim = base + NS_ERR_MAX - 1;
82 for (w = base + 1; w < lim; w++) {
92 * Generate an error packet of type error
93 * in response to bad packet.
97 ns_error(om, type, param)
105 struct idp *oip = mtod(om, struct idp *);
109 * If this packet was sent to the echo port,
110 * and nobody was there, just echo it.
111 * (Yes, this is a wart!)
113 if (type == NS_ERR_NOSOCK &&
114 oip->idp_dna.x_port == htons(2) &&
115 (type = ns_echo(om))==0)
120 printf("ns_err_error(%x, %d, %d)\n", oip, type, param);
123 * Don't Generate error packets in response to multicasts.
125 if (oip->idp_dna.x_host.c_host[0] & 1)
128 ns_errstat.ns_es_error++;
130 * Make sure that the old IDP packet had 30 bytes of data to return;
131 * if not, don't bother. Also don't EVER error if the old
132 * packet protocol was NS_ERR.
134 if (oip->idp_len < sizeof(struct idp)) {
135 ns_errstat.ns_es_oldshort++;
138 if (oip->idp_pt == NSPROTO_ERROR) {
139 ns_errstat.ns_es_oldns_err++;
144 * First, formulate ns_err message
146 m = m_gethdr(M_DONTWAIT, MT_HEADER);
149 m->m_len = sizeof(*ep);
150 MH_ALIGN(m, m->m_len);
151 ep = mtod(m, struct ns_epidp *);
152 if ((u_int)type > NS_ERR_TOO_BIG)
153 panic("ns_err_error");
154 ns_errstat.ns_es_outhist[ns_err_x(type)]++;
155 ep->ns_ep_errp.ns_err_num = htons((u_short)type);
156 ep->ns_ep_errp.ns_err_param = htons((u_short)param);
157 bcopy((caddr_t)oip, (caddr_t)&ep->ns_ep_errp.ns_err_idp, 42);
158 nip = &ep->ns_ep_idp;
159 nip->idp_len = sizeof(*ep);
160 nip->idp_len = htons((u_short)nip->idp_len);
161 nip->idp_pt = NSPROTO_ERROR;
163 nip->idp_dna = oip->idp_sna;
164 nip->idp_sna = oip->idp_dna;
167 nip->idp_sum = ns_cksum(m, sizeof(*ep));
169 nip->idp_sum = 0xffff;
170 (void) ns_output(m, (struct route *)0, 0);
181 printf("<net:%x%x,host:%x%x%x,port:%x>",
192 * Process a received NS_ERR message.
200 struct ns_epidp *epidp = mtod(m, struct ns_epidp *);
203 int type, code, param;
206 * Locate ns_err structure in mbuf, and check
207 * that not corrupted and of at least minimum length.
211 printf("ns_err_input from ");
212 ns_printhost(&epidp->ns_ep_idp.idp_sna);
213 printf("len %d\n", ntohs(epidp->ns_ep_idp.idp_len));
216 i = sizeof (struct ns_epidp);
217 if (((m->m_flags & M_EXT) || m->m_len < i) &&
218 (m = m_pullup(m, i)) == 0) {
219 ns_errstat.ns_es_tooshort++;
222 ep = &(mtod(m, struct ns_epidp *)->ns_ep_errp);
223 type = ntohs(ep->ns_err_num);
224 param = ntohs(ep->ns_err_param);
225 ns_errstat.ns_es_inhist[ns_err_x(type)]++;
229 * Message type specific processing.
232 printf("ns_err_input, type %d param %d\n", type, param);
234 if (type >= NS_ERR_TOO_BIG) {
237 ns_errstat.ns_es_outhist[ns_err_x(type)]++;
240 case NS_ERR_UNREACH_HOST:
241 code = PRC_UNREACH_NET;
245 code = PRC_TIMXCEED_INTRANS;
257 code = PRC_UNREACH_PORT;
260 case NS_ERR_UNSPEC_T:
261 case NS_ERR_BADSUM_T:
264 code = PRC_PARAMPROB;
269 * Problem with datagram; advise higher level routines.
273 printf("deliver to protocol %d\n",
274 ep->ns_err_idp.idp_pt);
276 switch(ep->ns_err_idp.idp_pt) {
278 spp_ctlinput(code, (caddr_t)ep);
282 idp_ctlinput(code, (caddr_t)ep);
289 ns_errstat.ns_es_badcode++;
301 struct idp *idp = mtod(m, struct idp *);
304 u_short ec_op; /* Operation, 1 = request, 2 = reply */
305 } *ec = (struct echo *)idp;
308 if (idp->idp_pt!=NSPROTO_ECHO) return(NS_ERR_NOSOCK);
309 if (ec->ec_op!=htons(1)) return(NS_ERR_UNSPEC);
311 ec->ec_op = htons(2);
314 idp->idp_dna = idp->idp_sna;
317 if (idp->idp_sum != 0xffff) {
319 idp->idp_sum = ns_cksum(m,
320 (int)(((ntohs(idp->idp_len) - 1)|1)+1));
322 (void) ns_output(m, (struct route *)0, NS_FORWARDING);