freebsd-dev/sys/netipx/ipx_error.c

379 lines
8.5 KiB
C
Raw Normal View History

/*
* Copyright (c) 1995, Mike Mitchell
* 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.
*
* @(#)ipx_error.c
*/
#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/if.h>
#include <net/route.h>
#include <netipx/ipx.h>
#include <netipx/spx.h>
#include <netipx/ipx_pcb.h>
#include <netipx/ipx_error.h>
/*
* IPX_ERR routines: error generation, receive packet processing, and
* routines to turnaround packets back to the originator.
*/
#ifndef IPX_ERRPRINTFS
#define IPX_ERRPRINTFS 0
#endif
int ipx_errprintfs = IPX_ERRPRINTFS;
struct ipx_errstat ipx_errstat;
int
ipx_err_x(c)
int c;
{
register u_short *w, *lim, *base = ipx_errstat.ipx_es_codes;
u_short x = c;
/*
* zero is a legit error code, handle specially
*/
if (x == 0)
return (0);
lim = base + IPX_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
ipx_error(om, type, param)
struct mbuf *om;
int type, param;
{
register struct ipx_epipx *ep;
struct mbuf *m;
struct ipx *nip;
register struct ipx *oip = mtod(om, struct ipx *);
/*
* If this packet was sent to the echo port,
* and nobody was there, just echo it.
* (Yes, this is a wart!)
*/
if (type == IPX_ERR_NOSOCK &&
oip->ipx_dna.x_port == htons(2) &&
(type = ipx_echo(om))==0)
return;
if (ipx_errprintfs)
printf("ipx_error(%x, %u, %d)\n", oip, type, param);
/*
* Don't Generate error packets in response to multicasts.
*/
if (oip->ipx_dna.x_host.c_host[0] & 1)
goto freeit;
ipx_errstat.ipx_es_error++;
/*
* Make sure that the old IPX packet had 30 bytes of data to return;
* if not, don't bother. Also don't EVER error if the old
* packet protocol was IPX_ERR.
*/
if (oip->ipx_len < sizeof(struct ipx)) {
ipx_errstat.ipx_es_oldshort++;
goto freeit;
}
if (oip->ipx_pt == IPXPROTO_ERROR) {
ipx_errstat.ipx_es_oldipx_err++;
goto freeit;
}
/*
* First, formulate ipx_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 ipx_epipx *);
if ((u_int)type > IPX_ERR_TOO_BIG)
panic("ipx_err_error");
ipx_errstat.ipx_es_outhist[ipx_err_x(type)]++;
ep->ipx_ep_errp.ipx_err_num = htons((u_short)type);
ep->ipx_ep_errp.ipx_err_param = htons((u_short)param);
bcopy((caddr_t)oip, (caddr_t)&ep->ipx_ep_errp.ipx_err_ipx, 42);
nip = &ep->ipx_ep_ipx;
nip->ipx_len = sizeof(*ep);
nip->ipx_len = htons((u_short)nip->ipx_len);
nip->ipx_pt = IPXPROTO_ERROR;
nip->ipx_tc = 0;
nip->ipx_dna = oip->ipx_sna;
nip->ipx_sna = oip->ipx_dna;
if (ipxcksum) {
nip->ipx_sum = 0;
nip->ipx_sum = ipx_cksum(m, sizeof(*ep));
} else
nip->ipx_sum = 0xffff;
(void) ipx_outputfl(m, (struct route *)0, 0);
freeit:
m_freem(om);
}
void
ipx_printhost(addr)
register struct ipx_addr *addr;
{
u_short port;
struct ipx_addr work = *addr;
register char *p; register u_char *q;
register char *net = "", *host = "";
char cport[10], chost[15], cnet[15];
port = ntohs(work.x_port);
if (ipx_nullnet(work) && ipx_nullhost(work)) {
if (port)
printf("*.%x", port);
else
printf("*.*");
return;
}
if (ipx_wildnet(work))
net = "any";
else if (ipx_nullnet(work))
net = "*";
else {
q = work.x_net.c_net;
sprintf(cnet, "%x%x%x%x",
q[0], q[1], q[2], q[3]);
for (p = cnet; *p == '0' && p < cnet + 8; p++)
continue;
net = p;
}
if (ipx_wildhost(work))
host = "any";
else if (ipx_nullhost(work))
host = "*";
else {
q = work.x_host.c_host;
sprintf(chost, "%x%x%x%x%x%x",
q[0], q[1], q[2], q[3], q[4], q[5]);
for (p = chost; *p == '0' && p < chost + 12; p++)
continue;
host = p;
}
if (port) {
if (strcmp(host, "*") == 0) {
host = "";
sprintf(cport, "%x", port);
} else
sprintf(cport, ".%x", port);
} else
*cport = 0;
printf("%s.%s%s", net, host, cport);
}
/*
* Process a received IPX_ERR message.
*/
void
ipx_err_input(m)
struct mbuf *m;
{
register struct ipx_errp *ep;
register struct ipx_epipx *epipx = mtod(m, struct ipx_epipx *);
register int i;
int type, code, param;
/*
* Locate ipx_err structure in mbuf, and check
* that not corrupted and of at least minimum length.
*/
if (ipx_errprintfs) {
printf("ipx_err_input ");
ipx_printhost(&epipx->ipx_ep_ipx.ipx_sna);
printf("%d\n", ntohs(epipx->ipx_ep_ipx.ipx_len));
}
i = sizeof (struct ipx_epipx);
if (((m->m_flags & M_EXT) || m->m_len < i) &&
(m = m_pullup(m, i)) == 0) {
ipx_errstat.ipx_es_tooshort++;
return;
}
ep = &(mtod(m, struct ipx_epipx *)->ipx_ep_errp);
type = ntohs(ep->ipx_err_num);
param = ntohs(ep->ipx_err_param);
ipx_errstat.ipx_es_inhist[ipx_err_x(type)]++;
/*
* Message type specific processing.
*/
if (ipx_errprintfs)
printf("ipx_err_input, type %d param %d\n", type, param);
if (type >= IPX_ERR_TOO_BIG) {
goto badcode;
}
ipx_errstat.ipx_es_outhist[ipx_err_x(type)]++;
switch (type) {
case IPX_ERR_UNREACH_HOST:
code = PRC_UNREACH_NET;
goto deliver;
case IPX_ERR_TOO_OLD:
code = PRC_TIMXCEED_INTRANS;
goto deliver;
case IPX_ERR_TOO_BIG:
code = PRC_MSGSIZE;
goto deliver;
case IPX_ERR_FULLUP:
code = PRC_QUENCH;
goto deliver;
case IPX_ERR_NOSOCK:
code = PRC_UNREACH_PORT;
goto deliver;
case IPX_ERR_UNSPEC_T:
case IPX_ERR_BADSUM_T:
case IPX_ERR_BADSUM:
case IPX_ERR_UNSPEC:
code = PRC_PARAMPROB;
goto deliver;
deliver:
/*
* Problem with datagram; advise higher level routines.
*/
if (ipx_errprintfs)
printf("deliver to protocol %d\n",
ep->ipx_err_ipx.ipx_pt);
switch(ep->ipx_err_ipx.ipx_pt) {
case IPXPROTO_SPX:
spx_ctlinput(code, (caddr_t)ep);
break;
default:
ipx_ctlinput(code, (caddr_t)ep);
}
goto freeit;
default:
badcode:
ipx_errstat.ipx_es_badcode++;
goto freeit;
}
freeit:
m_freem(m);
}
#ifdef notdef
u_long
ipxtime()
{
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
ipx_echo(m)
struct mbuf *m;
{
register struct ipx *ipx = mtod(m, struct ipx *);
register struct echo {
struct ipx ec_ipx;
u_short ec_op; /* Operation, 1 = request, 2 = reply */
} *ec = (struct echo *)ipx;
struct ipx_addr temp;
if (ipx->ipx_pt!=IPXPROTO_ECHO)
return(IPX_ERR_NOSOCK);
if (ec->ec_op!=htons(1))
return(IPX_ERR_UNSPEC);
ec->ec_op = htons(2);
temp = ipx->ipx_dna;
ipx->ipx_dna = ipx->ipx_sna;
ipx->ipx_sna = temp;
if (ipxcksum && ipx->ipx_sum != 0xffff) {
ipx->ipx_sum = 0;
ipx->ipx_sum = ipx_cksum(m,
(int)(((ntohs(ipx->ipx_len) - 1)|1)+1));
}
else
ipx->ipx_sum = 0xffff;
(void) ipx_outputfl(m, (struct route *)0, IPX_FORWARDING);
return(0);
}