[unix-history] / sys / netns / ns_error.c

/*
 * Copyright (c) 1984, 1988 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)ns_error.c	7.8 (Berkeley) 6/28/90
 */

#include "param.h"
#include "systm.h"
#include "malloc.h"
#include "mbuf.h"
#include "protosw.h"
#include "socket.h"
#include "time.h"
#include "kernel.h"

#include "../net/route.h"

#include "ns.h"
#include "ns_pcb.h"
#include "idp.h"
#include "ns_error.h"

#ifdef lint
#define NS_ERRPRINTFS 1
#endif

#ifdef NS_ERRPRINTFS
/*
 * NS_ERR routines: error generation, receive packet processing, and
 * routines to turnaround packets back to the originator.
 */
int	ns_errprintfs = 0;
#endif

ns_err_x(c)
{
	register u_short *w, *lim, *base = ns_errstat.ns_es_codes;
	u_short x = c;

	/*
	 * zero is a legit error code, handle specially
	 */
	if (x == 0)
		return (0);
	lim = base + NS_ERR_MAX - 1;
	for (w = base + 1; w < lim; w++) {
		if (*w == 0)
			*w = x;
		if (*w == x)
			break;
	}
	return (w - base);
}

/*
 * Generate an error packet of type error
 * in response to bad packet.
 */

ns_error(om, type, param)
	struct mbuf *om;
	int type;
{
	register struct ns_epidp *ep;
	struct mbuf *m;
	struct idp *nip;
	register struct idp *oip = mtod(om, struct idp *);
	extern int idpcksum;

	/*
	 * If this packet was sent to the echo port,
	 * and nobody was there, just echo it.
	 * (Yes, this is a wart!)
	 */
	if (type == NS_ERR_NOSOCK &&
	    oip->idp_dna.x_port == htons(2) &&
	    (type = ns_echo(om))==0)
		return;

#ifdef NS_ERRPRINTFS
	if (ns_errprintfs)
		printf("ns_err_error(%x, %d, %d)\n", oip, type, param);
#endif
	/*
	 * Don't Generate error packets in response to multicasts.
	 */
	if (oip->idp_dna.x_host.c_host[0] & 1)
		goto freeit;

	ns_errstat.ns_es_error++;
	/*
	 * Make sure that the old IDP packet had 30 bytes of data to return;
	 * if not, don't bother.  Also don't EVER error if the old
	 * packet protocol was NS_ERR.
	 */
	if (oip->idp_len < sizeof(struct idp)) {
		ns_errstat.ns_es_oldshort++;
		goto freeit;
	}
	if (oip->idp_pt == NSPROTO_ERROR) {
		ns_errstat.ns_es_oldns_err++;
		goto freeit;
	}

	/*
	 * First, formulate ns_err message
	 */
	m = m_gethdr(M_DONTWAIT, MT_HEADER);
	if (m == NULL)
		goto freeit;
	m->m_len = sizeof(*ep);
	MH_ALIGN(m, m->m_len);
	ep = mtod(m, struct ns_epidp *);
	if ((u_int)type > NS_ERR_TOO_BIG)
		panic("ns_err_error");
	ns_errstat.ns_es_outhist[ns_err_x(type)]++;
	ep->ns_ep_errp.ns_err_num = htons((u_short)type);
	ep->ns_ep_errp.ns_err_param = htons((u_short)param);
	bcopy((caddr_t)oip, (caddr_t)&ep->ns_ep_errp.ns_err_idp, 42);
	nip = &ep->ns_ep_idp;
	nip->idp_len = sizeof(*ep);
	nip->idp_len = htons((u_short)nip->idp_len);
	nip->idp_pt = NSPROTO_ERROR;
	nip->idp_tc = 0;
	nip->idp_dna = oip->idp_sna;
	nip->idp_sna = oip->idp_dna;
	if (idpcksum) {
		nip->idp_sum = 0;
		nip->idp_sum = ns_cksum(m, sizeof(*ep));
	} else 
		nip->idp_sum = 0xffff;
	(void) ns_output(m, (struct route *)0, 0);

freeit:
	m_freem(om);
}

ns_printhost(p)
register struct ns_addr *p;
{

	printf("<net:%x%x,host:%x%x%x,port:%x>",
			p->x_net.s_net[0],
			p->x_net.s_net[1],
			p->x_host.s_host[0],
			p->x_host.s_host[1],
			p->x_host.s_host[2],
			p->x_port);

}

/*
 * Process a received NS_ERR message.
 */
ns_err_input(m)
	struct mbuf *m;
{
	register struct ns_errp *ep;
	register struct ns_epidp *epidp = mtod(m, struct ns_epidp *);
	register int i;
	int type, code, param;

	/*
	 * Locate ns_err structure in mbuf, and check
	 * that not corrupted and of at least minimum length.
	 */
#ifdef NS_ERRPRINTFS
	if (ns_errprintfs) {
		printf("ns_err_input from ");
		ns_printhost(&epidp->ns_ep_idp.idp_sna);
		printf("len %d\n", ntohs(epidp->ns_ep_idp.idp_len));
	}
#endif
	i = sizeof (struct ns_epidp);
 	if (((m->m_flags & M_EXT) || m->m_len < i) &&
 		(m = m_pullup(m, i)) == 0)  {
		ns_errstat.ns_es_tooshort++;
		return;
	}
	ep = &(mtod(m, struct ns_epidp *)->ns_ep_errp);
	type = ntohs(ep->ns_err_num);
	param = ntohs(ep->ns_err_param);
	ns_errstat.ns_es_inhist[ns_err_x(type)]++;

#ifdef NS_ERRPRINTFS
	/*
	 * Message type specific processing.
	 */
	if (ns_errprintfs)
		printf("ns_err_input, type %d param %d\n", type, param);
#endif
	if (type >= NS_ERR_TOO_BIG) {
		goto badcode;
	}
	ns_errstat.ns_es_outhist[ns_err_x(type)]++;
	switch (type) {

	case NS_ERR_UNREACH_HOST:
		code = PRC_UNREACH_NET;
		goto deliver;

	case NS_ERR_TOO_OLD:
		code = PRC_TIMXCEED_INTRANS;
		goto deliver;

	case NS_ERR_TOO_BIG:
		code = PRC_MSGSIZE;
		goto deliver;

	case NS_ERR_FULLUP:
		code = PRC_QUENCH;
		goto deliver;

	case NS_ERR_NOSOCK:
		code = PRC_UNREACH_PORT;
		goto deliver;

	case NS_ERR_UNSPEC_T:
	case NS_ERR_BADSUM_T:
	case NS_ERR_BADSUM:
	case NS_ERR_UNSPEC:
		code = PRC_PARAMPROB;
		goto deliver;

	deliver:
		/*
		 * Problem with datagram; advise higher level routines.
		 */
#ifdef NS_ERRPRINTFS
		if (ns_errprintfs)
			printf("deliver to protocol %d\n",
				       ep->ns_err_idp.idp_pt);
#endif
		switch(ep->ns_err_idp.idp_pt) {
		case NSPROTO_SPP:
			spp_ctlinput(code, (caddr_t)ep);
			break;

		default:
			idp_ctlinput(code, (caddr_t)ep);
		}
		
		goto freeit;

	default:
	badcode:
		ns_errstat.ns_es_badcode++;
		goto freeit;

	}
freeit:
	m_freem(m);
}

#ifdef notdef
u_long
nstime()
{
	int s = splclock();
	u_long t;

	t = (time.tv_sec % (24*60*60)) * 1000 + time.tv_usec / 1000;
	splx(s);
	return (htonl(t));
}
#endif

ns_echo(m)
struct mbuf *m;
{
	register struct idp *idp = mtod(m, struct idp *);
	register struct echo {
	    struct idp	ec_idp;
	    u_short		ec_op; /* Operation, 1 = request, 2 = reply */
	} *ec = (struct echo *)idp;
	struct ns_addr temp;

	if (idp->idp_pt!=NSPROTO_ECHO) return(NS_ERR_NOSOCK);
	if (ec->ec_op!=htons(1)) return(NS_ERR_UNSPEC);

	ec->ec_op = htons(2);

	temp = idp->idp_dna;
	idp->idp_dna = idp->idp_sna;
	idp->idp_sna = temp;

	if (idp->idp_sum != 0xffff) {
		idp->idp_sum = 0;
		idp->idp_sum = ns_cksum(m,
		    (int)(((ntohs(idp->idp_len) - 1)|1)+1));
	}
	(void) ns_output(m, (struct route *)0, NS_FORWARDING);
	return(0);
}
Commit	Line	Data
15637ed4 RG	1	/*
	2	* Copyright (c) 1984, 1988 Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	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.
	20	*
	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
	31	* SUCH DAMAGE.
	32	*
	33	* @(#)ns_error.c 7.8 (Berkeley) 6/28/90
	34	*/
	35
	36	#include "param.h"
	37	#include "systm.h"
	38	#include "malloc.h"
	39	#include "mbuf.h"
	40	#include "protosw.h"
	41	#include "socket.h"
	42	#include "time.h"
	43	#include "kernel.h"
	44
	45	#include "../net/route.h"
	46
	47	#include "ns.h"
	48	#include "ns_pcb.h"
	49	#include "idp.h"
	50	#include "ns_error.h"
	51
	52	#ifdef lint
	53	#define NS_ERRPRINTFS 1
	54	#endif
	55
	56	#ifdef NS_ERRPRINTFS
	57	/*
	58	* NS_ERR routines: error generation, receive packet processing, and
	59	* routines to turnaround packets back to the originator.
	60	*/
	61	int ns_errprintfs = 0;
	62	#endif
	63
	64	ns_err_x(c)
65	{
66	register u_short w, lim, *base = ns_errstat.ns_es_codes;
67	u_short x = c;
68
69	/*
70	* zero is a legit error code, handle specially
71	*/
72	if (x == 0)
73	return (0);
74	lim = base + NS_ERR_MAX - 1;
75	for (w = base + 1; w < lim; w++) {
76	if (*w == 0)
77	*w = x;
78	if (*w == x)
79	break;
80	}
81	return (w - base);
82	}
83
84	/*
85	* Generate an error packet of type error
86	* in response to bad packet.
87	*/
88
89	ns_error(om, type, param)
90	struct mbuf *om;
91	int type;
92	{
93	register struct ns_epidp *ep;
94	struct mbuf *m;
95	struct idp *nip;
96	register struct idp oip = mtod(om, struct idp );
97	extern int idpcksum;
98
99	/*
100	* If this packet was sent to the echo port,
101	* and nobody was there, just echo it.
102	* (Yes, this is a wart!)
103	*/
104	if (type == NS_ERR_NOSOCK &&
105	oip->idp_dna.x_port == htons(2) &&
106	(type = ns_echo(om))==0)
107	return;
108
109	#ifdef NS_ERRPRINTFS
110	if (ns_errprintfs)
111	printf("ns_err_error(%x, %d, %d)\n", oip, type, param);
112	#endif
113	/*
114	* Don't Generate error packets in response to multicasts.
115	*/
116	if (oip->idp_dna.x_host.c_host[0] & 1)
117	goto freeit;
118
119	ns_errstat.ns_es_error++;
120	/*
121	* Make sure that the old IDP packet had 30 bytes of data to return;
122	* if not, don't bother. Also don't EVER error if the old
123	* packet protocol was NS_ERR.
124	*/
125	if (oip->idp_len < sizeof(struct idp)) {
126	ns_errstat.ns_es_oldshort++;
127	goto freeit;
128	}
129	if (oip->idp_pt == NSPROTO_ERROR) {
130	ns_errstat.ns_es_oldns_err++;
131	goto freeit;
132	}
133
134	/*
135	* First, formulate ns_err message
136	*/
137	m = m_gethdr(M_DONTWAIT, MT_HEADER);
138	if (m == NULL)
139	goto freeit;
140	m->m_len = sizeof(*ep);
141	MH_ALIGN(m, m->m_len);
142	ep = mtod(m, struct ns_epidp *);
143	if ((u_int)type > NS_ERR_TOO_BIG)
144	panic("ns_err_error");
145	ns_errstat.ns_es_outhist[ns_err_x(type)]++;
146	ep->ns_ep_errp.ns_err_num = htons((u_short)type);
147	ep->ns_ep_errp.ns_err_param = htons((u_short)param);
148	bcopy((caddr_t)oip, (caddr_t)&ep->ns_ep_errp.ns_err_idp, 42);
149	nip = &ep->ns_ep_idp;
150	nip->idp_len = sizeof(*ep);
151	nip->idp_len = htons((u_short)nip->idp_len);
152	nip->idp_pt = NSPROTO_ERROR;
153	nip->idp_tc = 0;
154	nip->idp_dna = oip->idp_sna;
155	nip->idp_sna = oip->idp_dna;
156	if (idpcksum) {
157	nip->idp_sum = 0;
158	nip->idp_sum = ns_cksum(m, sizeof(*ep));
159	} else
160	nip->idp_sum = 0xffff;
161	(void) ns_output(m, (struct route *)0, 0);
162
163	freeit:
164	m_freem(om);
165	}
166
167	ns_printhost(p)
168	register struct ns_addr *p;
169	{
170
171	printf("<net:%x%x,host:%x%x%x,port:%x>",
172	p->x_net.s_net[0],
173	p->x_net.s_net[1],
174	p->x_host.s_host[0],
175	p->x_host.s_host[1],
176	p->x_host.s_host[2],
177	p->x_port);
178
179	}
180
181	/*
182	* Process a received NS_ERR message.
183	*/
184	ns_err_input(m)
185	struct mbuf *m;
186	{
187	register struct ns_errp *ep;
188	register struct ns_epidp epidp = mtod(m, struct ns_epidp );
189	register int i;
190	int type, code, param;
191
192	/*
193	* Locate ns_err structure in mbuf, and check
194	* that not corrupted and of at least minimum length.
195	*/
196	#ifdef NS_ERRPRINTFS
197	if (ns_errprintfs) {
198	printf("ns_err_input from ");
199	ns_printhost(&epidp->ns_ep_idp.idp_sna);
200	printf("len %d\n", ntohs(epidp->ns_ep_idp.idp_len));
201	}
202	#endif
203	i = sizeof (struct ns_epidp);
204	if (((m->m_flags & M_EXT) \|\| m->m_len < i) &&
205	(m = m_pullup(m, i)) == 0) {
206	ns_errstat.ns_es_tooshort++;
207	return;
208	}
209	ep = &(mtod(m, struct ns_epidp *)->ns_ep_errp);
210	type = ntohs(ep->ns_err_num);
211	param = ntohs(ep->ns_err_param);
212	ns_errstat.ns_es_inhist[ns_err_x(type)]++;
213
214	#ifdef NS_ERRPRINTFS
215	/*
216	* Message type specific processing.
217	*/
218	if (ns_errprintfs)
219	printf("ns_err_input, type %d param %d\n", type, param);
220	#endif
221	if (type >= NS_ERR_TOO_BIG) {
222	goto badcode;
223	}
224	ns_errstat.ns_es_outhist[ns_err_x(type)]++;
225	switch (type) {
226
227	case NS_ERR_UNREACH_HOST:
228	code = PRC_UNREACH_NET;
229	goto deliver;
230
231	case NS_ERR_TOO_OLD:
232	code = PRC_TIMXCEED_INTRANS;
233	goto deliver;
234
235	case NS_ERR_TOO_BIG:
236	code = PRC_MSGSIZE;
237	goto deliver;
238
239	case NS_ERR_FULLUP:
240	code = PRC_QUENCH;
241	goto deliver;
242
243	case NS_ERR_NOSOCK:
244	code = PRC_UNREACH_PORT;
245	goto deliver;
246
247	case NS_ERR_UNSPEC_T:
248	case NS_ERR_BADSUM_T:
249	case NS_ERR_BADSUM:
250	case NS_ERR_UNSPEC:
251	code = PRC_PARAMPROB;
252	goto deliver;
253
254	deliver:
255	/*
256	* Problem with datagram; advise higher level routines.
257	*/
258	#ifdef NS_ERRPRINTFS
259	if (ns_errprintfs)
260	printf("deliver to protocol %d\n",
261	ep->ns_err_idp.idp_pt);
262	#endif
263	switch(ep->ns_err_idp.idp_pt) {
264	case NSPROTO_SPP:
265	spp_ctlinput(code, (caddr_t)ep);
266	break;
267
268	default:
269	idp_ctlinput(code, (caddr_t)ep);
270	}
271
272	goto freeit;
273
274	default:
275	badcode:
276	ns_errstat.ns_es_badcode++;
277	goto freeit;
278
279	}
280	freeit:
281	m_freem(m);
282	}
283
284	#ifdef notdef
285	u_long
286	nstime()
287	{
288	int s = splclock();
289	u_long t;
290
291	t = (time.tv_sec % (246060)) * 1000 + time.tv_usec / 1000;
292	splx(s);
293	return (htonl(t));
294	}
295	#endif
296
297	ns_echo(m)
298	struct mbuf *m;
299	{
300	register struct idp idp = mtod(m, struct idp );
301	register struct echo {
302	struct idp ec_idp;
303	u_short ec_op; /* Operation, 1 = request, 2 = reply */
304	} ec = (struct echo )idp;
305	struct ns_addr temp;
306
307	if (idp->idp_pt!=NSPROTO_ECHO) return(NS_ERR_NOSOCK);
308	if (ec->ec_op!=htons(1)) return(NS_ERR_UNSPEC);
309
310	ec->ec_op = htons(2);
311
312	temp = idp->idp_dna;
313	idp->idp_dna = idp->idp_sna;
314	idp->idp_sna = temp;
315
316	if (idp->idp_sum != 0xffff) {
317	idp->idp_sum = 0;
318	idp->idp_sum = ns_cksum(m,
319	(int)(((ntohs(idp->idp_len) - 1)\|1)+1));
320	}
321	(void) ns_output(m, (struct route *)0, NS_FORWARDING);
322	return(0);
323	}