NetBSD/usr.sbin/rtsold/rtsold.c

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/* $NetBSD: rtsold.c,v 1.2 1999/09/03 05:14:37 itojun Exp $ */
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/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* 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. Neither the name of the project 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 PROJECT 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 PROJECT 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.
*/
#include <sys/types.h>
#include <sys/time.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#include <netinet/icmp6.h>
#include <unistd.h>
#include <syslog.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <err.h>
#include <stdarg.h>
#include "rtsold.h"
struct ifinfo *iflist;
static struct timeval tm_max = {0x7fffffff, 0x7fffffff};
int dflag;
static int log_upto = 999;
static int fflag = 0;
/* protocol constatns */
#define MAX_RTR_SOLICITATION_DELAY 1 /* second */
#define RTR_SOLICITATION_INTERVAL 4 /* seconds */
#define MAX_RTR_SOLICITATIONS 3 /* times */
/* implementation dependent constants */
#define PROBE_INTERVAL 60 /* secondes XXX: should be configurable */
/* utility macros */
/* a < b */
#define TIMEVAL_LT(a, b) (((a).tv_sec < (b).tv_sec) ||\
(((a).tv_sec == (b).tv_sec) && \
((a).tv_usec < (b).tv_usec)))
/* a <= b */
#define TIMEVAL_LEQ(a, b) (((a).tv_sec < (b).tv_sec) ||\
(((a).tv_sec == (b).tv_sec) &&\
((a).tv_usec <= (b).tv_usec)))
/* a == b */
#define TIMEVAL_EQ(a, b) (((a).tv_sec==(b).tv_sec) && ((a).tv_usec==(b).tv_usec))
/* static variables and functions */
static int mobile_node = 0;
int main __P((int argc, char *argv[]));
static int ifconfig __P((char *ifname));
static int make_packet __P((struct ifinfo *ifinfo));
static struct timeval *rtsol_check_timer __P((void));
static void TIMEVAL_ADD __P((struct timeval *a, struct timeval *b,
struct timeval *result));
static void TIMEVAL_SUB __P((struct timeval *a, struct timeval *b,
struct timeval *result));
static void usage __P((char *progname));
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int
main(argc, argv)
int argc;
char *argv[];
{
int s, ch;
int once = 0;
struct timeval *timeout;
struct fd_set fdset;
char *argv0;
char *opts;
/*
* Initialization
*/
argv0 = argv[0];
/* get option */
if (argv0 && argv0[strlen(argv0) - 1] != 'd') {
fflag = 1;
once = 1;
opts = "dD";
} else
opts = "dDfm1";
while ((ch = getopt(argc, argv, opts)) != -1) {
switch(ch) {
case 'd':
dflag = 1;
break;
case 'D':
dflag = 2;
break;
case 'f':
fflag = 1;
break;
case 'm':
mobile_node = 1;
break;
case '1':
once = 1;
break;
default:
usage(argv0);
}
}
argc -= optind;
argv += optind;
if (argc == 0)
usage(argv0);
/* set log level */
if (dflag == 0)
log_upto = LOG_NOTICE;
if (!fflag) {
openlog(argv0, LOG_NDELAY|LOG_PID, LOG_DAEMON);
if (log_upto >= 0)
setlogmask(LOG_UPTO(log_upto));
}
/* random value initilization */
srandom((u_long)time(NULL));
/* warn if accept_rtadv is down */
if (!getinet6sysctl(IPV6CTL_ACCEPT_RTADV))
warnx("kernel is configured not to accept RAs");
/* configuration per interface */
if (ifinit())
errx(1, "failed to initilizatoin interfaces");
while (argc--) {
if (ifconfig(*argv))
errx(1, "failed to initilize %s", *argv);
argv++;
}
/* open a socket for sending RS and receiving RA */
if ((s = sockopen()) < 0)
errx(1, "failed to open a socket");
/* setup for probing default routers */
if (probe_init())
errx(1, "failed to setup for probing routers");
if (!fflag)
daemon(0, 0); /* act as a daemon */
FD_ZERO(&fdset);
FD_SET(s, &fdset);
while (1) { /* main loop */
extern int errno;
int e;
struct fd_set select_fd = fdset;
timeout = rtsol_check_timer();
if (once) {
struct ifinfo *ifi;
/* if we have no timeout, we are done (or failed) */
if (timeout == NULL)
break;
/* if all if have got RA packet, we are done */
for (ifi = iflist; ifi; ifi = ifi->next) {
if (ifi->state != IFS_DOWN && ifi->racnt == 0)
break;
}
if (ifi == NULL)
break;
}
if ((e = select(s + 1, &select_fd, NULL, NULL, timeout)) < 1) {
if (e < 0) {
warnmsg(LOG_ERR, __FUNCTION__, "select: %s",
strerror(errno));
}
continue;
}
/* packet reception */
if (FD_ISSET(s, &fdset))
rtsol_input(s);
}
/* NOTREACHED */
return 0;
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}
static int
ifconfig(char *ifname)
{
struct ifinfo *ifinfo;
struct sockaddr_dl *sdl;
int flags;
if ((sdl = if_nametosdl(ifname)) == NULL) {
warnmsg(LOG_ERR, __FUNCTION__,
"failed to get link layer information for %s", ifname);
return(-1);
}
if (find_ifinfo(sdl->sdl_index)) {
warnmsg(LOG_ERR, __FUNCTION__,
"interface %s was already cofigured", ifname);
return(-1);
}
if ((ifinfo = malloc(sizeof(*ifinfo))) == NULL) {
warnmsg(LOG_ERR, __FUNCTION__, "memory allocation failed");
return(-1);
}
memset(ifinfo, 0, sizeof(*ifinfo));
ifinfo->sdl = sdl;
strncpy(ifinfo->ifname, ifname, sizeof(ifinfo->ifname));
/* construct a router solicitation message */
if (make_packet(ifinfo))
goto bad;
/*
* check if the interface is available.
* also check if SIOCGIFMEDIA ioctl is OK on the interface.
*/
ifinfo->mediareqok = 1;
ifinfo->active = interface_status(ifinfo);
if (!ifinfo->mediareqok) {
/*
* probe routers periodically even if the link status
* does not change.
*/
ifinfo->probeinterval = PROBE_INTERVAL;
}
/* activate interface: interface_up returns 0 on success */
flags = interface_up(ifinfo->ifname);
if (flags == 0)
ifinfo->state = IFS_DELAY;
else if (flags == IFS_TENTATIVE)
ifinfo->state = IFS_TENTATIVE;
else
ifinfo->state = IFS_DOWN;
rtsol_timer_update(ifinfo);
/* link into chain */
if (iflist)
ifinfo->next = iflist;
iflist = ifinfo;
return(0);
bad:
free(ifinfo);
free(ifinfo->sdl);
return(-1);
}
struct ifinfo *
find_ifinfo(int ifindex)
{
struct ifinfo *ifi;
for (ifi = iflist; ifi; ifi = ifi->next)
if (ifi->sdl->sdl_index == ifindex)
return(ifi);
return(NULL);
}
static int
make_packet(struct ifinfo *ifinfo)
{
char *buf;
struct nd_router_solicit *rs;
size_t packlen = sizeof(struct nd_router_solicit), lladdroptlen = 0;
if ((lladdroptlen = lladdropt_length(ifinfo->sdl)) == 0) {
warnmsg(LOG_INFO, __FUNCTION__,
"link-layer address option has null length"
" on %s. Treat as not included.", ifinfo->ifname);
}
packlen += lladdroptlen;
ifinfo->rs_datalen = packlen;
/* allocate buffer */
if ((buf = malloc(packlen)) == NULL) {
warnmsg(LOG_ERR, __FUNCTION__,
"memory allocation failed for %s", ifinfo->ifname);
return(-1);
}
ifinfo->rs_data = buf;
/* fill in the message */
rs = (struct nd_router_solicit *)buf;
rs->nd_rs_type = ND_ROUTER_SOLICIT;
rs->nd_rs_code = 0;
rs->nd_rs_cksum = 0;
rs->nd_rs_reserved = 0;
buf += sizeof(*rs);
/* fill in source link-layer address option */
if (lladdroptlen)
lladdropt_fill(ifinfo->sdl, (struct nd_opt_hdr *)buf);
return(0);
}
static struct timeval *
rtsol_check_timer()
{
static struct timeval returnval;
struct timeval now, rtsol_timer;
struct ifinfo *ifinfo;
int flags;
gettimeofday(&now, NULL);
rtsol_timer = tm_max;
for (ifinfo = iflist; ifinfo; ifinfo = ifinfo->next) {
if (TIMEVAL_LEQ(ifinfo->expire, now)) {
if (dflag > 1)
warnmsg(LOG_DEBUG, __FUNCTION__,
"timer expiration on %s, "
"state = %d", ifinfo->ifname,
ifinfo->state);
switch(ifinfo->state) {
case IFS_DOWN:
case IFS_TENTATIVE:
/* interface_up returns 0 on success */
flags = interface_up(ifinfo->ifname);
if (flags == 0)
ifinfo->state = IFS_DELAY;
else if (flags == IFS_TENTATIVE)
ifinfo->state = IFS_TENTATIVE;
else
ifinfo->state = IFS_DOWN;
break;
case IFS_IDLE:
{
int oldstatus = ifinfo->active;
int probe = 0;
ifinfo->active =
interface_status(ifinfo);
if (oldstatus != ifinfo->active) {
warnmsg(LOG_DEBUG, __FUNCTION__,
"%s status is changed"
" from %d to %d",
ifinfo->ifname,
oldstatus, ifinfo->active);
probe = 1;
ifinfo->state = IFS_DELAY;
}
else if (ifinfo->probeinterval &&
(ifinfo->probetimer -=
ifinfo->timer.tv_sec) <= 0) {
/* probe timer expired */
ifinfo->probetimer =
ifinfo->probeinterval;
probe = 1;
ifinfo->state = IFS_PROBE;
}
if (probe && mobile_node)
defrouter_probe(ifinfo->sdl->sdl_index);
break;
}
case IFS_DELAY:
ifinfo->state = IFS_PROBE;
sendpacket(ifinfo);
break;
case IFS_PROBE:
if (ifinfo->probes < MAX_RTR_SOLICITATIONS)
sendpacket(ifinfo);
else {
warnmsg(LOG_INFO, __FUNCTION__,
"No answer "
"after sending %d RSs",
ifinfo->probes);
ifinfo->probes = 0;
ifinfo->state = IFS_IDLE;
}
break;
}
rtsol_timer_update(ifinfo);
}
if (TIMEVAL_LT(ifinfo->expire, rtsol_timer))
rtsol_timer = ifinfo->expire;
}
if (TIMEVAL_EQ(rtsol_timer, tm_max)) {
warnmsg(LOG_DEBUG, __FUNCTION__, "there is no timer");
return(NULL);
}
else if (TIMEVAL_LT(rtsol_timer, now))
/* this may occur when the interval is too small */
returnval.tv_sec = returnval.tv_usec = 0;
else
TIMEVAL_SUB(&rtsol_timer, &now, &returnval);
if (dflag > 1)
warnmsg(LOG_DEBUG, __FUNCTION__, "New timer is %d:%08d",
returnval.tv_sec, returnval.tv_usec);
return(&returnval);
}
void
rtsol_timer_update(struct ifinfo *ifinfo)
{
#define MILLION 1000000
#define DADRETRY 10 /* XXX: adhoc */
long interval;
struct timeval now;
bzero(&ifinfo->timer, sizeof(ifinfo->timer));
switch (ifinfo->state) {
case IFS_DOWN:
case IFS_TENTATIVE:
if (++ifinfo->dadcount > DADRETRY) {
ifinfo->dadcount = 0;
ifinfo->timer.tv_sec = PROBE_INTERVAL;
}
else
ifinfo->timer.tv_sec = 1;
break;
case IFS_IDLE:
if (mobile_node) {
/* XXX should be configurable */
ifinfo->timer.tv_sec = 3;
}
else
ifinfo->timer = tm_max; /* stop timer(valid?) */
break;
case IFS_DELAY:
interval = random() % (MAX_RTR_SOLICITATION_DELAY * MILLION);
ifinfo->timer.tv_sec = interval / MILLION;
ifinfo->timer.tv_usec = interval % MILLION;
break;
case IFS_PROBE:
ifinfo->timer.tv_sec = RTR_SOLICITATION_INTERVAL;
break;
default:
warnmsg(LOG_ERR, __FUNCTION__,
"illegal interface state(%d) on %s",
ifinfo->state, ifinfo->ifname);
return;
}
/* reset the timer */
if (TIMEVAL_EQ(ifinfo->timer, tm_max)) {
ifinfo->expire = tm_max;
warnmsg(LOG_DEBUG, __FUNCTION__,
"stop timer for %s", ifinfo->ifname);
}
else {
gettimeofday(&now, NULL);
TIMEVAL_ADD(&now, &ifinfo->timer, &ifinfo->expire);
if (dflag > 1)
warnmsg(LOG_DEBUG, __FUNCTION__,
"set timer for %s to %d:%d", ifinfo->ifname,
(int)ifinfo->timer.tv_sec,
(int)ifinfo->timer.tv_usec);
}
#undef MILLION
}
/* timer related utility functions */
#define MILLION 1000000
/* result = a + b */
static void
TIMEVAL_ADD(struct timeval *a, struct timeval *b, struct timeval *result)
{
long l;
if ((l = a->tv_usec + b->tv_usec) < MILLION) {
result->tv_usec = l;
result->tv_sec = a->tv_sec + b->tv_sec;
}
else {
result->tv_usec = l - MILLION;
result->tv_sec = a->tv_sec + b->tv_sec + 1;
}
}
/*
* result = a - b
* XXX: this function assumes that a >= b.
*/
static void
TIMEVAL_SUB(struct timeval *a, struct timeval *b, struct timeval *result)
{
long l;
if ((l = a->tv_usec - b->tv_usec) >= 0) {
result->tv_usec = l;
result->tv_sec = a->tv_sec - b->tv_sec;
}
else {
result->tv_usec = MILLION + l;
result->tv_sec = a->tv_sec - b->tv_sec - 1;
}
}
static void
usage(char *progname)
{
if (progname && progname[strlen(progname) - 1] != 'd')
fprintf(stderr, "usage: rtsol [-dD] interfaces\n");
else
fprintf(stderr, "usage: rtsold [-dDfm1] interfaces\n");
exit(1);
}
void
#if __STDC__
warnmsg(int priority, const char *func, const char *msg, ...)
#else
warnmsg(priority, func, msg, va_alist)
int priority;
const char *func;
const char *msg;
va_dcl
#endif
{
va_list ap;
char buf[BUFSIZ];
va_start(ap, msg);
if (fflag) {
if (priority <= log_upto) {
(void)vfprintf(stderr, msg, ap);
(void)fprintf(stderr, "\n");
}
} else {
snprintf(buf, sizeof(buf), "<%s> %s", func, msg);
vsyslog(priority, buf, ap);
}
va_end(ap);
}