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NetBSD/usr.sbin/rtadvd/config.c

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/* $NetBSD: config.c,v 1.3 1999/07/06 13:02:09 itojun Exp $ */
/*
* Copyright (C) 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/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <net/if.h>
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
#include <net/if_var.h>
#endif /* __FreeBSD__ >= 3 */
#include <net/route.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet6/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/icmp6.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <syslog.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#ifdef __NetBSD__
#include <search.h>
#endif
#include <unistd.h>
#include "rtadvd.h"
#include "advcap.h"
#include "timer.h"
#include "if.h"
#include "config.h"
static void makeentry __P((char *, int, char *, int));
static void make_packet __P((struct rainfo *));
static void get_prefix __P((struct rainfo *));
extern struct rainfo *ralist;
void
getconfig(intface)
char *intface;
{
int stat, pfxs, i;
char tbuf[BUFSIZ];
struct rainfo *tmp;
long val;
char buf[BUFSIZ];
char *bp = buf;
char *addr;
#define MUSTHAVE(var, cap) \
{ \
int t; \
if ((t = agetnum(cap)) < 0) { \
fprintf(stderr, "rtadvd: need %s for interface %s\n", \
cap, intface); \
exit(1); \
} \
var = t; \
}
#define MAYHAVE(var, cap, def) \
{ \
if ((var = agetnum(cap)) < 0) \
var = def; \
}
if ((stat = agetent(tbuf, intface)) <= 0) {
memset(tbuf, 0, sizeof(tbuf));
syslog(LOG_INFO,
"<%s> %s isn't defined in the configuration file"
" or the configuration file doesn't exist."
" Treat it as default",
__FUNCTION__, intface);
}
tmp = (struct rainfo *)malloc(sizeof(*ralist));
memset(tmp, 0, sizeof(*tmp));
tmp->prefix.next = tmp->prefix.prev = &tmp->prefix;
/* get interface information */
if (agetflag("nolladdr"))
tmp->advlinkopt = 0;
else
tmp->advlinkopt = 1;
if (tmp->advlinkopt) {
if ((tmp->sdl = if_nametosdl(intface)) == NULL) {
syslog(LOG_ERR,
"<%s> can't get information of %s",
__FUNCTION__, intface);
exit(1);
}
tmp->ifindex = tmp->sdl->sdl_index;
} else
tmp->ifindex = if_nametoindex(intface);
strncpy(tmp->ifname, intface, sizeof(tmp->ifname));
if ((tmp->phymtu = if_getmtu(intface)) == 0) {
tmp->phymtu = IPV6_MMTU;
syslog(LOG_WARNING,
"<%s> can't get interface mtu of %s. Treat as %d",
__FUNCTION__, intface, IPV6_MMTU);
}
/*
* set router configuration variables.
*/
MAYHAVE(val, "maxinterval", DEF_MAXRTRADVINTERVAL);
if (val < MIN_MAXINTERVAL || val > MAX_MAXINTERVAL) {
syslog(LOG_ERR,
"<%s> maxinterval must be between %d and %d",
__FUNCTION__, MIN_MAXINTERVAL, MAX_MAXINTERVAL);
exit(1);
}
tmp->maxinterval = (u_int)val;
MAYHAVE(val, "mininterval", tmp->maxinterval/3);
if (val < MIN_MININTERVAL || val > (tmp->maxinterval * 3) / 4) {
syslog(LOG_ERR,
"<%s> mininterval must be between %d and %d",
__FUNCTION__,
MIN_MININTERVAL,
(tmp->maxinterval * 3) / 4);
exit(1);
}
tmp->mininterval = (u_int)val;
MAYHAVE(val, "chlim", DEF_ADVCURHOPLIMIT);
tmp->hoplimit = val & 0xff;
MAYHAVE(val, "raflags", 0);
tmp->managedflg= val & ND_RA_FLAG_MANAGED;
tmp->otherflg = val & ND_RA_FLAG_OTHER;
MAYHAVE(val, "rltime", tmp->maxinterval * 3);
if (val && (val < tmp->maxinterval || val > MAXROUTERLIFETIME)) {
syslog(LOG_ERR,
"<%s> router lifetime on %s must be 0 or"
" between %d and %d",
__FUNCTION__, intface,
tmp->maxinterval, MAXROUTERLIFETIME);
exit(1);
}
tmp->lifetime = val & 0xffff;
MAYHAVE(val, "rtime", DEF_ADVREACHABLETIME);
if (val > MAXREACHABLETIME) {
syslog(LOG_ERR,
"<%s> reachable time must be no greater than %d",
__FUNCTION__, MAXREACHABLETIME);
exit(1);
}
tmp->reachabletime = (u_int32_t)val;
MAYHAVE(val, "retrans", DEF_ADVRETRANSTIMER);
if (val < 0 || val > 0xffffffff) {
syslog(LOG_ERR,
"<%s> retrans time out of range", __FUNCTION__);
exit(1);
}
tmp->retranstimer = (u_int32_t)val;
/* prefix information */
if ((pfxs = agetnum("addrs")) < 0) {
/* auto configure prefix information */
if (agetstr("addr", &bp) || agetstr("addr1", &bp)) {
syslog(LOG_ERR,
"<%s> conflicting prefix configuration for %s: "
"automatic and manual config at the same time",
__FUNCTION__, intface);
exit(1);
}
get_prefix(tmp);
}
else {
tmp->pfxs = pfxs;
for (i = 0; i < pfxs; i++) {
struct prefix *pfx;
char entbuf[256];
int added = (pfxs > 1) ? 1 : 0;
/* allocate memory to store prefix information */
if ((pfx = malloc(sizeof(struct prefix))) == NULL) {
syslog(LOG_ERR,
"<%s> can't allocate enough memory",
__FUNCTION__);
exit(1);
}
/* link into chain */
insque(pfx, &tmp->prefix);
makeentry(entbuf, i, "prefixlen", added);
MAYHAVE(val, entbuf, 64);
if (val < 0 || val > 128) {
syslog(LOG_ERR,
"<%s> prefixlen out of range",
__FUNCTION__);
exit(1);
}
pfx->prefixlen = (int)val;
makeentry(entbuf, i, "pinfoflags", added);
MAYHAVE(val, entbuf,
(ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO));
pfx->onlinkflg = val & ND_OPT_PI_FLAG_ONLINK;
pfx->autoconfflg = val & ND_OPT_PI_FLAG_AUTO;
makeentry(entbuf, i, "vltime", added);
MAYHAVE(val, entbuf, DEF_ADVVALIDLIFETIME);
if (val < 0 || val > 0xffffffff) {
syslog(LOG_ERR,
"<%s> vltime out of range",
__FUNCTION__);
exit(1);
}
pfx->validlifetime = (u_int32_t)val;
makeentry(entbuf, i, "pltime", added);
MAYHAVE(val, entbuf, DEF_ADVPREFERREDLIFETIME);
if (val < 0 || val > 0xffffffff) {
syslog(LOG_ERR,
"<%s> pltime out of range",
__FUNCTION__);
exit(1);
}
pfx->preflifetime = (u_int32_t)val;
makeentry(entbuf, i, "addr", added);
addr = (char *)agetstr(entbuf, &bp);
if (addr == NULL) {
syslog(LOG_ERR,
"<%s> need %s as an prefix for "
"interface %s",
__FUNCTION__, entbuf, intface);
exit(1);
}
if (inet_pton(AF_INET6, addr,
&pfx->prefix) != 1) {
syslog(LOG_ERR,
"<%s> inet_pton failed for %s",
__FUNCTION__, addr);
exit(1);
}
if (IN6_IS_ADDR_MULTICAST(&pfx->prefix)) {
syslog(LOG_ERR,
"<%s> multicast prefix(%s) must "
"not be advertised (IF=%s)",
__FUNCTION__, addr, intface);
exit(1);
}
if (IN6_IS_ADDR_LINKLOCAL(&pfx->prefix))
syslog(LOG_NOTICE,
"<%s> link-local prefix(%s) will be"
" advertised on %s",
__FUNCTION__, addr, intface);
}
}
MAYHAVE(val, "mtu", 0);
if (val < 0 || val > 0xffffffff) {
syslog(LOG_ERR,
"<%s> mtu out of range", __FUNCTION__);
exit(1);
}
tmp->linkmtu = (u_int32_t)val;
if (tmp->linkmtu == 0) {
char *mtustr;
if ((mtustr = (char *)agetstr("mtu", &bp)) &&
strcmp(mtustr, "auto") == 0)
tmp->linkmtu = tmp->phymtu;
}
else if (tmp->linkmtu < IPV6_MMTU || tmp->linkmtu > tmp->phymtu) {
syslog(LOG_ERR,
"<%s> advertised link mtu must be between"
" least MTU and physical link MTU",
__FUNCTION__);
exit(1);
}
/* okey */
tmp->next = ralist;
ralist = tmp;
/* construct the sending packet */
make_packet(tmp);
/* set timer */
tmp->timer = rtadvd_add_timer(ra_timeout, ra_timer_update,
tmp, tmp);
ra_timer_update((void *)tmp, &tmp->timer->tm);
rtadvd_set_timer(&tmp->timer->tm, tmp->timer);
}
static void
get_prefix(struct rainfo *rai)
{
size_t len;
u_char *buf, *lim, *next;
u_char ntopbuf[INET6_ADDRSTRLEN];
if ((len = rtbuf_len()) < 0) {
syslog(LOG_ERR,
"<%s> can't get buffer length for routing info",
__FUNCTION__);
exit(1);
}
if ((buf = malloc(len)) == NULL) {
syslog(LOG_ERR,
"<%s> can't allocate buffer", __FUNCTION__);
exit(1);
}
if (get_rtinfo(buf, &len) < 0) {
syslog(LOG_ERR,
"<%s> can't get routing inforamtion", __FUNCTION__);
exit(1);
}
lim = buf + len;
next = get_next_msg(buf, lim, rai->ifindex, &len,
RTADV_TYPE2BITMASK(RTM_GET));
while (next < lim) {
struct prefix *pp;
struct in6_addr *a;
/* allocate memory to store prefix info. */
if ((pp = malloc(sizeof(*pp))) == NULL) {
syslog(LOG_ERR,
"<%s> can't get allocate buffer for prefix",
__FUNCTION__);
exit(1);
}
memset(pp, 0, sizeof(*pp));
/* set prefix and its length */
a = get_addr(next);
memcpy(&pp->prefix, a, sizeof(*a));
if ((pp->prefixlen = get_prefixlen(next)) < 0) {
syslog(LOG_ERR,
"<%s> failed to get prefixlen "
"or prefixl is invalid",
__FUNCTION__);
exit(1);
}
syslog(LOG_DEBUG,
"<%s> add %s/%d to prefix list on %s",
__FUNCTION__,
inet_ntop(AF_INET6, a, ntopbuf, INET6_ADDRSTRLEN),
pp->prefixlen, rai->ifname);
/* set other fields with protocol defaults */
pp->validlifetime = DEF_ADVVALIDLIFETIME;
pp->preflifetime = DEF_ADVPREFERREDLIFETIME;
pp->onlinkflg = 1;
pp->autoconfflg = 1;
/* link into chain */
insque(pp, &rai->prefix);
/* counter increment */
rai->pfxs++;
/* forward pointer and get next prefix(if any) */
next += len;
next = get_next_msg(next, lim, rai->ifindex,
&len, RTADV_TYPE2BITMASK(RTM_GET));
}
free(buf);
}
static void
makeentry(buf, id, string, add)
char *buf, *string;
int id, add;
{
strcpy(buf, string);
if (add) {
char *cp;
cp = (char *)index(buf, '\0');
cp += sprintf(cp, "%d", id);
*cp = '\0';
}
}
/*
* Add a prefix to the list of specified interface and reconstruct
* the outgoing packet.
* The prefix must not be in the list.
* XXX: other parameter of the prefix(e.g. lifetime) shoule be
* able to be specified.
*/
static void
add_prefix(struct rainfo *rai, struct in6_prefixreq *ipr)
{
struct prefix *prefix;
u_char ntopbuf[INET6_ADDRSTRLEN];
if ((prefix = malloc(sizeof(*prefix))) == NULL) {
syslog(LOG_ERR, "<%s> memory allocation failed",
__FUNCTION__);
return; /* XXX: error or exit? */
}
prefix->prefix = ipr->ipr_prefix.sin6_addr;
prefix->prefixlen = ipr->ipr_plen;
prefix->validlifetime = ipr->ipr_vltime;
prefix->preflifetime = ipr->ipr_pltime;
prefix->onlinkflg = ipr->ipr_raf_onlink;
prefix->autoconfflg = ipr->ipr_raf_auto;
insque(prefix, &rai->prefix);
syslog(LOG_DEBUG, "<%s> new prefix %s/%d was added on %s",
__FUNCTION__, inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr,
ntopbuf, INET6_ADDRSTRLEN),
ipr->ipr_plen, rai->ifname);
/* free the previous packet */
free(rai->ra_data);
rai->ra_data = 0;
/* reconstruct the packet */
rai->pfxs++;
make_packet(rai);
/*
* reset the timer so that the new prefix will be advertised quickly.
*/
rai->initcounter = 0;
ra_timer_update((void *)rai, &rai->timer->tm);
rtadvd_set_timer(&rai->timer->tm, rai->timer);
}
/*
* Delete a prefix to the list of specified interface and reconstruct
* the outgoing packet.
* The prefix must be in the list
*/
void
delete_prefix(struct rainfo *rai, struct prefix *prefix)
{
u_char ntopbuf[INET6_ADDRSTRLEN];
remque(prefix);
syslog(LOG_DEBUG, "<%s> prefix %s/%d was deleted on %s",
__FUNCTION__, inet_ntop(AF_INET6, &prefix->prefix,
ntopbuf, INET6_ADDRSTRLEN),
prefix->prefixlen, rai->ifname);
free(prefix);
rai->pfxs--;
make_packet(rai);
}
/*
* Try to get an in6_prefixreq contents for a prefix which matches
* ipr->ipr_prefix and ipr->ipr_plen and belongs to
* the interface whose name is ipr->ipr_name[].
*/
static int
init_prefix(struct in6_prefixreq *ipr)
{
int s;
if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
syslog(LOG_ERR, "<%s> socket: %s", __FUNCTION__,
strerror(errno));
exit(1);
}
if (ioctl(s, SIOCGIFPREFIX_IN6, (caddr_t)ipr) < 0) {
syslog(LOG_INFO, "<%s> ioctl:SIOCGIFPREFIX %s", __FUNCTION__,
strerror(errno));
ipr->ipr_vltime = DEF_ADVVALIDLIFETIME;
ipr->ipr_pltime = DEF_ADVPREFERREDLIFETIME;
ipr->ipr_raf_onlink = 1;
ipr->ipr_raf_auto = 1;
/* omit other field initialization */
}
else if (ipr->ipr_origin < PR_ORIG_RR) {
u_char ntopbuf[INET6_ADDRSTRLEN];
syslog(LOG_WARNING, "<%s> Added prefix(%s)'s origin %d is"
"lower than PR_ORIG_RR(router renumbering)."
"This should not happen if I am router", __FUNCTION__,
inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr, ntopbuf,
sizeof(ntopbuf)), ipr->ipr_origin);
return 1;
}
close(s);
return 0;
}
void
make_prefix(struct rainfo *rai, int ifindex, struct in6_addr *addr, int plen)
{
struct in6_prefixreq ipr;
memset(&ipr, 0, sizeof(ipr));
if (if_indextoname(ifindex, ipr.ipr_name) == NULL) {
syslog(LOG_ERR, "<%s> Prefix added interface No.%d doesn't"
"exist. This should not happen! %s", __FUNCTION__,
ifindex, strerror(errno));
exit(1);
}
ipr.ipr_prefix.sin6_len = sizeof(ipr.ipr_prefix);
ipr.ipr_prefix.sin6_family = AF_INET6;
ipr.ipr_prefix.sin6_addr = *addr;
ipr.ipr_plen = plen;
if (init_prefix(&ipr))
return; /* init failed by some error */
add_prefix(rai, &ipr);
}
static void
make_packet(struct rainfo *rainfo)
{
size_t packlen, lladdroptlen = 0;
char *buf;
struct nd_router_advert *ra;
struct nd_opt_prefix_info *ndopt_pi;
struct nd_opt_mtu *ndopt_mtu;
struct prefix *pfx;
/* calculate total length */
packlen = sizeof(struct nd_router_advert);
if (rainfo->advlinkopt) {
if ((lladdroptlen = lladdropt_length(rainfo->sdl)) == 0) {
syslog(LOG_INFO,
"<%s> link-layer address option has"
" null length on %s."
" Treat as not included.",
__FUNCTION__, rainfo->ifname);
rainfo->advlinkopt = 0;
}
packlen += lladdroptlen;
}
if (rainfo->pfxs)
packlen += sizeof(struct nd_opt_prefix_info) * rainfo->pfxs;
if (rainfo->linkmtu)
packlen += sizeof(struct nd_opt_mtu);
/* allocate memory for the packet */
if ((buf = malloc(packlen)) == NULL) {
syslog(LOG_ERR,
"<%s> can't get enough memory for an RA packet",
__FUNCTION__);
exit(1);
}
rainfo->ra_data = buf;
/* XXX: what if packlen > 576? */
rainfo->ra_datalen = packlen;
/*
* construct the packet
*/
ra = (struct nd_router_advert *)buf;
ra->nd_ra_type = ND_ROUTER_ADVERT;
ra->nd_ra_code = 0;
ra->nd_ra_cksum = 0;
ra->nd_ra_curhoplimit = (u_int8_t)(0xff & rainfo->hoplimit);
ra->nd_ra_flags_reserved = 0;
ra->nd_ra_flags_reserved |=
rainfo->managedflg ? ND_RA_FLAG_MANAGED : 0;
ra->nd_ra_flags_reserved |=
rainfo->otherflg ? ND_RA_FLAG_OTHER : 0;
ra->nd_ra_router_lifetime = htons(rainfo->lifetime);
ra->nd_ra_reachable = htonl(rainfo->reachabletime);
ra->nd_ra_retransmit = htonl(rainfo->retranstimer);
buf += sizeof(*ra);
if (rainfo->advlinkopt) {
lladdropt_fill(rainfo->sdl, (struct nd_opt_hdr *)buf);
buf += lladdroptlen;
}
if (rainfo->linkmtu) {
ndopt_mtu = (struct nd_opt_mtu *)buf;
ndopt_mtu->nd_opt_mtu_type = ND_OPT_MTU;
ndopt_mtu->nd_opt_mtu_len = 1;
ndopt_mtu->nd_opt_mtu_reserved = 0;
ndopt_mtu->nd_opt_mtu_mtu = ntohl(rainfo->linkmtu);
buf += sizeof(struct nd_opt_mtu);
}
for (pfx = rainfo->prefix.next;
pfx != &rainfo->prefix; pfx = pfx->next) {
ndopt_pi = (struct nd_opt_prefix_info *)buf;
ndopt_pi->nd_opt_pi_type = ND_OPT_PREFIX_INFORMATION;
ndopt_pi->nd_opt_pi_len = 4;
ndopt_pi->nd_opt_pi_prefix_len = pfx->prefixlen;
ndopt_pi->nd_opt_pi_flags_reserved = 0;
if (pfx->onlinkflg)
ndopt_pi->nd_opt_pi_flags_reserved |=
ND_OPT_PI_FLAG_ONLINK;
if (pfx->autoconfflg)
ndopt_pi->nd_opt_pi_flags_reserved |=
ND_OPT_PI_FLAG_AUTO;
ndopt_pi->nd_opt_pi_valid_time = ntohl(pfx->validlifetime);
ndopt_pi->nd_opt_pi_preferred_time =
ntohl(pfx->preflifetime);
ndopt_pi->nd_opt_pi_reserved2 = 0;
ndopt_pi->nd_opt_pi_prefix = pfx->prefix;
buf += sizeof(struct nd_opt_prefix_info);
}
return;
}
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