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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 1.11 2006/12/22 23:57:54 swildner 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 idpcksum; /* from ns_input.c */
55 extern int idpchsum; /* from ns_input.c */
56 extern void spp_ctlinput( int, caddr_t); /* from spp_usrreq.c XXX */
58 struct ns_errstat ns_errstat;
61 #define NS_ERRPRINTFS 1
66 * NS_ERR routines: error generation, receive packet processing, and
67 * routines to turnaround packets back to the originator.
69 int ns_errprintfs = 0;
75 u_short *w, *lim, *base = ns_errstat.ns_es_codes;
79 * zero is a legit error code, handle specially
83 lim = base + NS_ERR_MAX - 1;
84 for (w = base + 1; w < lim; w++) {
94 * Generate an error packet of type error
95 * in response to bad packet.
99 ns_error(struct mbuf *om, int type, int param)
104 struct idp *oip = mtod(om, struct idp *);
107 * If this packet was sent to the echo port,
108 * and nobody was there, just echo it.
109 * (Yes, this is a wart!)
111 if (type == NS_ERR_NOSOCK &&
112 oip->idp_dna.x_port == htons(2) &&
113 (type = ns_echo(om))==0)
118 kprintf("ns_err_error(%x, %d, %d)\n", oip, type, param);
121 * Don't Generate error packets in response to multicasts.
123 if (oip->idp_dna.x_host.c_host[0] & 1)
126 ns_errstat.ns_es_error++;
128 * Make sure that the old IDP packet had 30 bytes of data to return;
129 * if not, don't bother. Also don't EVER error if the old
130 * packet protocol was NS_ERR.
132 if (oip->idp_len < sizeof(struct idp)) {
133 ns_errstat.ns_es_oldshort++;
136 if (oip->idp_pt == NSPROTO_ERROR) {
137 ns_errstat.ns_es_oldns_err++;
142 * First, formulate ns_err message
144 m = m_gethdr(MB_DONTWAIT, MT_HEADER);
147 m->m_len = sizeof(*ep);
148 MH_ALIGN(m, m->m_len);
149 ep = mtod(m, struct ns_epidp *);
150 if ((u_int)type > NS_ERR_TOO_BIG)
151 panic("ns_err_error");
152 ns_errstat.ns_es_outhist[ns_err_x(type)]++;
153 ep->ns_ep_errp.ns_err_num = htons((u_short)type);
154 ep->ns_ep_errp.ns_err_param = htons((u_short)param);
155 bcopy((caddr_t)oip, (caddr_t)&ep->ns_ep_errp.ns_err_idp, 42);
156 nip = &ep->ns_ep_idp;
157 nip->idp_len = sizeof(*ep);
158 nip->idp_len = htons((u_short)nip->idp_len);
159 nip->idp_pt = NSPROTO_ERROR;
161 nip->idp_dna = oip->idp_sna;
162 nip->idp_sna = oip->idp_dna;
165 nip->idp_sum = ns_cksum(m, sizeof(*ep));
167 nip->idp_sum = 0xffff;
168 ns_output(m, NULL, 0);
175 ns_printhost(struct ns_addr *p)
178 kprintf("<net:%x%x,host:%x%x%x,port:%x>",
189 * Process a received NS_ERR message.
192 ns_err_input(struct mbuf *m)
196 struct ns_epidp *epidp = mtod(m, struct ns_epidp *);
199 int type, code, param;
202 * Locate ns_err structure in mbuf, and check
203 * that not corrupted and of at least minimum length.
207 kprintf("ns_err_input from ");
208 ns_printhost(&epidp->ns_ep_idp.idp_sna);
209 kprintf("len %d\n", ntohs(epidp->ns_ep_idp.idp_len));
212 i = sizeof (struct ns_epidp);
213 if (((m->m_flags & M_EXT) || m->m_len < i) &&
214 (m = m_pullup(m, i)) == 0) {
215 ns_errstat.ns_es_tooshort++;
218 ep = &(mtod(m, struct ns_epidp *)->ns_ep_errp);
219 type = ntohs(ep->ns_err_num);
220 param = ntohs(ep->ns_err_param);
221 ns_errstat.ns_es_inhist[ns_err_x(type)]++;
225 * Message type specific processing.
228 kprintf("ns_err_input, type %d param %d\n", type, param);
230 if (type >= NS_ERR_TOO_BIG) {
233 ns_errstat.ns_es_outhist[ns_err_x(type)]++;
236 case NS_ERR_UNREACH_HOST:
237 code = PRC_UNREACH_NET;
241 code = PRC_TIMXCEED_INTRANS;
253 code = PRC_UNREACH_PORT;
256 case NS_ERR_UNSPEC_T:
257 case NS_ERR_BADSUM_T:
260 code = PRC_PARAMPROB;
265 * Problem with datagram; advise higher level routines.
269 kprintf("deliver to protocol %d\n",
270 ep->ns_err_idp.idp_pt);
272 switch(ep->ns_err_idp.idp_pt) {
274 spp_ctlinput(code, (caddr_t)ep);
278 idp_ctlinput(code, (caddr_t)ep);
285 ns_errstat.ns_es_badcode++;
294 ns_echo(struct mbuf *m)
296 struct idp *idp = mtod(m, struct idp *);
299 u_short ec_op; /* Operation, 1 = request, 2 = reply */
300 } *ec = (struct echo *)idp;
303 if (idp->idp_pt!=NSPROTO_ECHO) return(NS_ERR_NOSOCK);
304 if (ec->ec_op!=htons(1)) return(NS_ERR_UNSPEC);
306 ec->ec_op = htons(2);
309 idp->idp_dna = idp->idp_sna;
312 if (idp->idp_sum != 0xffff) {
314 idp->idp_sum = ns_cksum(m,
315 (int)(((ntohs(idp->idp_len) - 1)|1)+1));
317 ns_output(m, NULL, NS_FORWARDING);