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NetBSD/sys/netns/ns_error.c

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/*
* Copyright (c) 1984, 1988, 1993
* The 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 8.1 (Berkeley) 6/10/93
* $Id: ns_error.c,v 1.4 1994/05/13 06:11:14 mycroft Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <net/route.h>
#include <netns/ns.h>
#include <netns/ns_pcb.h>
#include <netns/idp.h>
#include <netns/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);
}
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