[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.
 *
 *	from: @(#)ns_error.c	7.8 (Berkeley) 6/28/90
 *	$Id: ns_error.c,v 1.4 1993/11/07 17:50:25 wollman Exp $
 */

#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

struct ns_errstat ns_errstat;

#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

int
ns_err_x(c)
	int 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.
 */
void
ns_error(om, type, param)
	struct mbuf *om;
	int type;
	int param;
{
	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);
}

void
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.
 */
void
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

int
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	*
42524852	33	* from: @(#)ns_error.c 7.8 (Berkeley) 6/28/90
4c45483e	34	* $Id: ns_error.c,v 1.4 1993/11/07 17:50:25 wollman Exp $
15637ed4 RG	35	*/
	36
	37	#include "param.h"
	38	#include "systm.h"
	39	#include "malloc.h"
	40	#include "mbuf.h"
	41	#include "protosw.h"
	42	#include "socket.h"
	43	#include "time.h"
	44	#include "kernel.h"
	45
	46	#include "../net/route.h"
	47
	48	#include "ns.h"
	49	#include "ns_pcb.h"
	50	#include "idp.h"
	51	#include "ns_error.h"
	52
	53	#ifdef lint
	54	#define NS_ERRPRINTFS 1
	55	#endif
	56
8ace4366 GW	57	struct ns_errstat ns_errstat;
8ace4366 GW	58
15637ed4 RG	59	#ifdef NS_ERRPRINTFS
	60	/*
	61	* NS_ERR routines: error generation, receive packet processing, and
	62	* routines to turnaround packets back to the originator.
	63	*/
	64	int ns_errprintfs = 0;
	65	#endif
	66
4c45483e	67	int
15637ed4	68	ns_err_x(c)
4c45483e	69	int c;
15637ed4 RG	70	{
	71	register u_short w, lim, *base = ns_errstat.ns_es_codes;
	72	u_short x = c;
	73
	74	/*
	75	* zero is a legit error code, handle specially
	76	*/
	77	if (x == 0)
	78	return (0);
	79	lim = base + NS_ERR_MAX - 1;
	80	for (w = base + 1; w < lim; w++) {
	81	if (*w == 0)
	82	*w = x;
	83	if (*w == x)
	84	break;
	85	}
	86	return (w - base);
	87	}
	88
	89	/*
	90	* Generate an error packet of type error
	91	* in response to bad packet.
	92	*/
4c45483e	93	void
15637ed4 RG	94	ns_error(om, type, param)
	95	struct mbuf *om;
	96	int type;
4c45483e	97	int param;
15637ed4 RG	98	{
	99	register struct ns_epidp *ep;
	100	struct mbuf *m;
	101	struct idp *nip;
	102	register struct idp oip = mtod(om, struct idp );
	103	extern int idpcksum;
	104
	105	/*
	106	* If this packet was sent to the echo port,
	107	* and nobody was there, just echo it.
	108	* (Yes, this is a wart!)
	109	*/
	110	if (type == NS_ERR_NOSOCK &&
	111	oip->idp_dna.x_port == htons(2) &&
	112	(type = ns_echo(om))==0)
	113	return;
	114
	115	#ifdef NS_ERRPRINTFS
	116	if (ns_errprintfs)
	117	printf("ns_err_error(%x, %d, %d)\n", oip, type, param);
	118	#endif
	119	/*
	120	* Don't Generate error packets in response to multicasts.
	121	*/
	122	if (oip->idp_dna.x_host.c_host[0] & 1)
	123	goto freeit;
	124
	125	ns_errstat.ns_es_error++;
	126	/*
	127	* Make sure that the old IDP packet had 30 bytes of data to return;
	128	* if not, don't bother. Also don't EVER error if the old
	129	* packet protocol was NS_ERR.
	130	*/
	131	if (oip->idp_len < sizeof(struct idp)) {
	132	ns_errstat.ns_es_oldshort++;
	133	goto freeit;
	134	}
	135	if (oip->idp_pt == NSPROTO_ERROR) {
	136	ns_errstat.ns_es_oldns_err++;
	137	goto freeit;
	138	}
	139
	140	/*
	141	* First, formulate ns_err message
	142	*/
	143	m = m_gethdr(M_DONTWAIT, MT_HEADER);
	144	if (m == NULL)
	145	goto freeit;
	146	m->m_len = sizeof(*ep);
	147	MH_ALIGN(m, m->m_len);
	148	ep = mtod(m, struct ns_epidp *);
	149	if ((u_int)type > NS_ERR_TOO_BIG)
	150	panic("ns_err_error");
	151	ns_errstat.ns_es_outhist[ns_err_x(type)]++;
	152	ep->ns_ep_errp.ns_err_num = htons((u_short)type);
	153	ep->ns_ep_errp.ns_err_param = htons((u_short)param);
	154	bcopy((caddr_t)oip, (caddr_t)&ep->ns_ep_errp.ns_err_idp, 42);
	155	nip = &ep->ns_ep_idp;
	156	nip->idp_len = sizeof(*ep);
	157	nip->idp_len = htons((u_short)nip->idp_len);
	158	nip->idp_pt = NSPROTO_ERROR;
	159	nip->idp_tc = 0;
	160	nip->idp_dna = oip->idp_sna;
	161	nip->idp_sna = oip->idp_dna;
162	if (idpcksum) {
163	nip->idp_sum = 0;
164	nip->idp_sum = ns_cksum(m, sizeof(*ep));
165	} else
166	nip->idp_sum = 0xffff;
167	(void) ns_output(m, (struct route *)0, 0);
168
169	freeit:
170	m_freem(om);
171	}
172
4c45483e	173	void
15637ed4	174	ns_printhost(p)
4c45483e	175	register struct ns_addr *p;
15637ed4 RG	176	{
	177
	178	printf("<net:%x%x,host:%x%x%x,port:%x>",
	179	p->x_net.s_net[0],
	180	p->x_net.s_net[1],
	181	p->x_host.s_host[0],
	182	p->x_host.s_host[1],
	183	p->x_host.s_host[2],
	184	p->x_port);
	185
	186	}
	187
	188	/*
	189	* Process a received NS_ERR message.
	190	*/
4c45483e	191	void
15637ed4 RG	192	ns_err_input(m)
	193	struct mbuf *m;
	194	{
	195	register struct ns_errp *ep;
	196	register struct ns_epidp epidp = mtod(m, struct ns_epidp );
	197	register int i;
	198	int type, code, param;
	199
	200	/*
	201	* Locate ns_err structure in mbuf, and check
	202	* that not corrupted and of at least minimum length.
	203	*/
	204	#ifdef NS_ERRPRINTFS
	205	if (ns_errprintfs) {
	206	printf("ns_err_input from ");
	207	ns_printhost(&epidp->ns_ep_idp.idp_sna);
	208	printf("len %d\n", ntohs(epidp->ns_ep_idp.idp_len));
	209	}
	210	#endif
	211	i = sizeof (struct ns_epidp);
	212	if (((m->m_flags & M_EXT) \|\| m->m_len < i) &&
	213	(m = m_pullup(m, i)) == 0) {
	214	ns_errstat.ns_es_tooshort++;
	215	return;
	216	}
	217	ep = &(mtod(m, struct ns_epidp *)->ns_ep_errp);
	218	type = ntohs(ep->ns_err_num);
	219	param = ntohs(ep->ns_err_param);
	220	ns_errstat.ns_es_inhist[ns_err_x(type)]++;
	221
	222	#ifdef NS_ERRPRINTFS
	223	/*
	224	* Message type specific processing.
	225	*/
	226	if (ns_errprintfs)
	227	printf("ns_err_input, type %d param %d\n", type, param);
	228	#endif
	229	if (type >= NS_ERR_TOO_BIG) {
	230	goto badcode;
	231	}
	232	ns_errstat.ns_es_outhist[ns_err_x(type)]++;
	233	switch (type) {
	234
	235	case NS_ERR_UNREACH_HOST:
	236	code = PRC_UNREACH_NET;
	237	goto deliver;
	238
	239	case NS_ERR_TOO_OLD:
	240	code = PRC_TIMXCEED_INTRANS;
	241	goto deliver;
	242
	243	case NS_ERR_TOO_BIG:
	244	code = PRC_MSGSIZE;
	245	goto deliver;
	246
	247	case NS_ERR_FULLUP:
	248	code = PRC_QUENCH;
	249	goto deliver;
	250
	251	case NS_ERR_NOSOCK:
	252	code = PRC_UNREACH_PORT;
	253	goto deliver;
	254
	255	case NS_ERR_UNSPEC_T:
256	case NS_ERR_BADSUM_T:
257	case NS_ERR_BADSUM:
258	case NS_ERR_UNSPEC:
259	code = PRC_PARAMPROB;
260	goto deliver;
261
262	deliver:
263	/*
264	* Problem with datagram; advise higher level routines.
265	*/
266	#ifdef NS_ERRPRINTFS
267	if (ns_errprintfs)
268	printf("deliver to protocol %d\n",
269	ep->ns_err_idp.idp_pt);
270	#endif
271	switch(ep->ns_err_idp.idp_pt) {
272	case NSPROTO_SPP:
273	spp_ctlinput(code, (caddr_t)ep);
274	break;
275
276	default:
277	idp_ctlinput(code, (caddr_t)ep);
278	}
279
280	goto freeit;
281
282	default:
283	badcode:
284	ns_errstat.ns_es_badcode++;
285	goto freeit;
286
287	}
288	freeit:
289	m_freem(m);
290	}
291
292	#ifdef notdef
293	u_long
294	nstime()
295	{
296	int s = splclock();
297	u_long t;
298
299	t = (time.tv_sec % (246060)) * 1000 + time.tv_usec / 1000;
300	splx(s);
301	return (htonl(t));
302	}
303	#endif
304
4c45483e	305	int
15637ed4	306	ns_echo(m)
4c45483e	307	struct mbuf *m;
15637ed4 RG	308	{
	309	register struct idp idp = mtod(m, struct idp );
	310	register struct echo {
	311	struct idp ec_idp;
	312	u_short ec_op; /* Operation, 1 = request, 2 = reply */
	313	} ec = (struct echo )idp;
	314	struct ns_addr temp;
	315
	316	if (idp->idp_pt!=NSPROTO_ECHO) return(NS_ERR_NOSOCK);
	317	if (ec->ec_op!=htons(1)) return(NS_ERR_UNSPEC);
	318
	319	ec->ec_op = htons(2);
	320
	321	temp = idp->idp_dna;
	322	idp->idp_dna = idp->idp_sna;
	323	idp->idp_sna = temp;
	324
	325	if (idp->idp_sum != 0xffff) {
	326	idp->idp_sum = 0;
	327	idp->idp_sum = ns_cksum(m,
	328	(int)(((ntohs(idp->idp_len) - 1)\|1)+1));
	329	}
	330	(void) ns_output(m, (struct route *)0, NS_FORWARDING);
	331	return(0);
	332	}