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NetBSD/usr.sbin/rtadvd/config.c

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/* $NetBSD: config.c,v 1.44 2020/04/21 12:16:47 roy Exp $ */
/* $KAME: config.c,v 1.93 2005/10/17 14:40:02 suz 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 <sys/sysctl.h>
#include <net/if.h>
#include <net/route.h>
#include <net/if_dl.h>
#ifdef __FreeBSD__
#include <net/if_var.h>
#endif
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet/icmp6.h>
#include <netinet6/nd6.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <syslog.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <search.h>
#include <unistd.h>
#include <ifaddrs.h>
#include <inttypes.h>
#include "rtadvd.h"
#include "advcap.h"
#include "timer.h"
#include "if.h"
#include "config.h"
#include "logit.h"
#include "prog_ops.h"
#ifndef __arraycount
#define __arraycount(__x) (sizeof(__x) / sizeof(__x[0]))
#endif
static time_t prefix_timo = (60 * 120); /* 2 hours.
* XXX: should be configurable. */
static struct rtadvd_timer *prefix_timeout(void *);
static void makeentry(char *, size_t, int, const char *);
static int getinet6sysctl(int);
static size_t
encode_domain(char *dst, const char *src)
{
ssize_t len;
char *odst, *p;
odst = dst;
while (src && (len = strlen(src)) != 0) {
p = strchr(src, '.');
*dst++ = len = MIN(63, p == NULL ? len : p - src);
memcpy(dst, src, len);
dst += len;
if (p == NULL)
break;
src = p + 1;
}
*dst++ = '\0';
return dst - odst;
}
void
free_rainfo(struct rainfo *rai)
{
struct soliciter *sol;
struct prefix *pfx;
struct rtinfo *rti;
struct rdnss *rdnss;
struct rdnss_addr *rdnsa;
struct dnssl *dnssl;
struct dnssl_domain *dnsd;
rtadvd_remove_timer(&rai->timer);
rtadvd_remove_timer(&rai->timer_sol);
while ((sol = TAILQ_FIRST(&rai->soliciter))) {
TAILQ_REMOVE(&rai->soliciter, sol, next);
free(sol);
}
while ((pfx = TAILQ_FIRST(&rai->prefix))) {
TAILQ_REMOVE(&rai->prefix, pfx, next);
free(pfx);
}
while ((rti = TAILQ_FIRST(&rai->route))) {
TAILQ_REMOVE(&rai->route, rti, next);
free(rti);
}
while ((rdnss = TAILQ_FIRST(&rai->rdnss))) {
TAILQ_REMOVE(&rai->rdnss, rdnss, next);
while ((rdnsa = TAILQ_FIRST(&rdnss->list))) {
TAILQ_REMOVE(&rdnss->list, rdnsa, next);
free(rdnsa);
}
free(rdnss);
}
while ((dnssl = TAILQ_FIRST(&rai->dnssl))) {
TAILQ_REMOVE(&rai->dnssl, dnssl, next);
while ((dnsd = TAILQ_FIRST(&dnssl->list))) {
TAILQ_REMOVE(&dnssl->list, dnsd, next);
free(dnsd);
}
free(dnssl);
}
free(rai->sdl);
free(rai->ra_data);
free(rai);
}
void
getconfig(const char *intface, int exithard)
{
int stat, c, i;
char tbuf[BUFSIZ];
struct rainfo *tmp, *rai;
int32_t val;
int64_t val64;
char buf[BUFSIZ];
char *bp = buf;
char *addr, *flagstr, *ap;
static int forwarding = -1;
char entbuf[256], abuf[256];
struct rdnss *rdnss;
struct dnssl *dnssl;
#define MUSTHAVE(var, cap) \
do { \
int64_t t; \
if ((t = agetnum(cap)) < 0) { \
fprintf(stderr, "rtadvd: need %s for interface %s\n", \
cap, intface); \
goto errexit; \
} \
var = t; \
} while (0)
#define MAYHAVE(var, cap, def) \
do { \
if ((var = agetnum(cap)) < 0) \
var = def; \
} while (0)
#define ELM_MALLOC(p) \
do { \
p = calloc(1, sizeof(*p)); \
if (p == NULL) { \
logit(LOG_ERR, "<%s> calloc failed: %m", \
__func__); \
goto errexit; \
} \
} while(/*CONSTCOND*/0)
if (if_nametoindex(intface) == 0) {
logit(LOG_INFO, "<%s> interface %s not found, ignoring",
__func__, intface);
return;
}
logit(LOG_DEBUG, "<%s> loading configuration for interface %s",
__func__, intface);
if ((stat = agetent(tbuf, intface)) <= 0) {
memset(tbuf, 0, sizeof(tbuf));
logit(LOG_INFO,
"<%s> %s isn't defined in the configuration file"
" or the configuration file doesn't exist."
" Treat it as default",
__func__, intface);
}
ELM_MALLOC(tmp);
TAILQ_INIT(&tmp->soliciter);
TAILQ_INIT(&tmp->prefix);
TAILQ_INIT(&tmp->route);
TAILQ_INIT(&tmp->rdnss);
TAILQ_INIT(&tmp->dnssl);
/* check if we are allowed to forward packets (if not determined) */
if (forwarding < 0) {
if ((forwarding = getinet6sysctl(IPV6CTL_FORWARDING)) < 0)
exit(1);
}
/* get interface information */
if (agetflag("nolladdr"))
tmp->advlinkopt = 0;
else
tmp->advlinkopt = 1;
if (tmp->advlinkopt) {
if ((tmp->sdl = if_nametosdl(intface)) == NULL) {
logit(LOG_ERR,
"<%s> can't get information of %s",
__func__, intface);
goto errexit;
}
tmp->ifindex = tmp->sdl->sdl_index;
} else {
tmp->ifindex = if_nametoindex(intface);
if (tmp->ifindex == 0) {
logit(LOG_ERR,
"<%s> can't get information of %s",
__func__, intface);
goto errexit;
}
}
tmp->ifflags = if_getflags(tmp->ifindex, 0);
strlcpy(tmp->ifname, intface, sizeof(tmp->ifname));
if ((tmp->phymtu = if_getmtu(intface)) == 0) {
tmp->phymtu = IPV6_MMTU;
logit(LOG_WARNING,
"<%s> can't get interface mtu of %s. Treat as %d",
__func__, intface, IPV6_MMTU);
}
/*
* set router configuration variables.
*/
MAYHAVE(val, "maxinterval", DEF_MAXRTRADVINTERVAL);
if (val < MIN_MAXINTERVAL || val > MAX_MAXINTERVAL) {
logit(LOG_ERR,
"<%s> maxinterval (%d) on %s is invalid "
"(must be between %u and %u)", __func__, val,
intface, MIN_MAXINTERVAL, MAX_MAXINTERVAL);
goto errexit;
}
tmp->maxinterval = val;
MAYHAVE(val, "mininterval", tmp->maxinterval/3);
if (val < MIN_MININTERVAL || val > (tmp->maxinterval * 3) / 4) {
logit(LOG_ERR,
"<%s> mininterval (%d) on %s is invalid "
"(must be between %u and %d)",
__func__, val, intface, MIN_MININTERVAL,
(tmp->maxinterval * 3) / 4);
goto errexit;
}
tmp->mininterval = val;
MAYHAVE(val, "chlim", DEF_ADVCURHOPLIMIT);
tmp->hoplimit = val & 0xff;
if ((flagstr = (char *)agetstr("raflags", &bp))) {
val = 0;
if (strchr(flagstr, 'm'))
val |= ND_RA_FLAG_MANAGED;
if (strchr(flagstr, 'o'))
val |= ND_RA_FLAG_OTHER;
if (strchr(flagstr, 'h'))
val |= ND_RA_FLAG_RTPREF_HIGH;
if (strchr(flagstr, 'l')) {
if ((val & ND_RA_FLAG_RTPREF_HIGH)) {
logit(LOG_ERR, "<%s> the \'h\' and \'l\'"
" router flags are exclusive", __func__);
goto errexit;
}
val |= ND_RA_FLAG_RTPREF_LOW;
}
} else {
MAYHAVE(val, "raflags", 0);
}
tmp->managedflg = val & ND_RA_FLAG_MANAGED;
tmp->otherflg = val & ND_RA_FLAG_OTHER;
#ifndef ND_RA_FLAG_RTPREF_MASK
#define ND_RA_FLAG_RTPREF_MASK 0x18 /* 00011000 */
#define ND_RA_FLAG_RTPREF_RSV 0x10 /* 00010000 */
#endif
tmp->rtpref = val & ND_RA_FLAG_RTPREF_MASK;
if (tmp->rtpref == ND_RA_FLAG_RTPREF_RSV) {
logit(LOG_ERR, "<%s> invalid router preference (%02x) on %s",
__func__, tmp->rtpref, intface);
goto errexit;
}
MAYHAVE(val, "rltime", DEF_ADVROUTERLIFETIME);
if (val && (val < tmp->maxinterval || val > MAXROUTERLIFETIME)) {
logit(LOG_ERR,
"<%s> router lifetime (%d) on %s is invalid "
"(must be 0 or between %d and %d)",
__func__, val, intface,
tmp->maxinterval, MAXROUTERLIFETIME);
goto errexit;
}
/*
* Basically, hosts MUST NOT send Router Advertisement messages at any
* time (RFC 2461, Section 6.2.3). However, it would sometimes be
* useful to allow hosts to advertise some parameters such as prefix
* information and link MTU. Thus, we allow hosts to invoke rtadvd
* only when router lifetime (on every advertising interface) is
* explicitly set zero. (see also the above section)
*/
if (val && forwarding == 0) {
logit(LOG_ERR,
"<%s> non zero router lifetime is specified for %s, "
"which must not be allowed for hosts. you must "
"change router lifetime or enable IPv6 forwarding.",
__func__, intface);
goto errexit;
}
tmp->lifetime = val & 0xffff;
MAYHAVE(val, "rtime", DEF_ADVREACHABLETIME);
if (val < 0 || val > MAXREACHABLETIME) {
logit(LOG_ERR,
"<%s> reachable time (%d) on %s is invalid "
"(must be no greater than %d)",
__func__, val, intface, MAXREACHABLETIME);
goto errexit;
}
tmp->reachabletime = (uint32_t)val;
MAYHAVE(val64, "retrans", DEF_ADVRETRANSTIMER);
if (val64 < 0 || val64 > 0xffffffff) {
logit(LOG_ERR, "<%s> retrans time (%lld) on %s out of range",
__func__, (long long)val64, intface);
goto errexit;
}
tmp->retranstimer = (uint32_t)val64;
if (agetnum("hapref") != -1 || agetnum("hatime") != -1) {
logit(LOG_ERR,
"<%s> mobile-ip6 configuration not supported",
__func__);
goto errexit;
}
/* prefix information */
/*
* This is an implementation specific parameter to consider
* link propagation delays and poorly synchronized clocks when
* checking consistency of advertised lifetimes.
*/
MAYHAVE(val, "clockskew", 0);
tmp->clockskew = val;
tmp->pfxs = 0;
for (i = -1; i < MAXPREFIX; i++) {
struct prefix *pfx;
makeentry(entbuf, sizeof(entbuf), i, "addr");
addr = (char *)agetstr(entbuf, &bp);
if (addr == NULL)
continue;
/* allocate memory to store prefix information */
if ((pfx = calloc(1, sizeof(*pfx))) == NULL) {
logit(LOG_ERR,
"<%s> can't allocate memory: %m",
__func__);
goto errexit;
}
TAILQ_INSERT_TAIL(&tmp->prefix, pfx, next);
tmp->pfxs++;
pfx->rainfo = tmp;
pfx->origin = PREFIX_FROM_CONFIG;
if (inet_pton(AF_INET6, addr, &pfx->prefix) != 1) {
logit(LOG_ERR,
"<%s> inet_pton failed for %s",
__func__, addr);
goto errexit;
}
if (IN6_IS_ADDR_MULTICAST(&pfx->prefix)) {
logit(LOG_ERR,
"<%s> multicast prefix (%s) must "
"not be advertised on %s",
__func__, addr, intface);
goto errexit;
}
if (IN6_IS_ADDR_LINKLOCAL(&pfx->prefix))
logit(LOG_NOTICE,
"<%s> link-local prefix (%s) will be"
" advertised on %s",
__func__, addr, intface);
makeentry(entbuf, sizeof(entbuf), i, "prefixlen");
MAYHAVE(val, entbuf, 64);
if (val < 0 || val > 128) {
logit(LOG_ERR, "<%s> prefixlen (%d) for %s "
"on %s out of range",
__func__, val, addr, intface);
goto errexit;
}
pfx->prefixlen = (int)val;
makeentry(entbuf, sizeof(entbuf), i, "pinfoflags");
if ((flagstr = (char *)agetstr(entbuf, &bp))) {
val = 0;
if (strchr(flagstr, 'l'))
val |= ND_OPT_PI_FLAG_ONLINK;
if (strchr(flagstr, 'a'))
val |= ND_OPT_PI_FLAG_AUTO;
} else {
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, sizeof(entbuf), i, "vltime");
MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME);
if (val64 < 0 || val64 > 0xffffffff) {
logit(LOG_ERR, "<%s> vltime (%lld) for "
"%s/%d on %s is out of range",
__func__, (long long)val64,
addr, pfx->prefixlen, intface);
goto errexit;
}
pfx->validlifetime = (uint32_t)val64;
makeentry(entbuf, sizeof(entbuf), i, "vltimedecr");
if (agetflag(entbuf)) {
struct timespec now;
prog_clock_gettime(CLOCK_MONOTONIC, &now);
pfx->vltimeexpire =
now.tv_sec + pfx->validlifetime;
}
makeentry(entbuf, sizeof(entbuf), i, "pltime");
MAYHAVE(val64, entbuf, DEF_ADVPREFERREDLIFETIME);
if (val64 < 0 || val64 > 0xffffffff) {
logit(LOG_ERR,
"<%s> pltime (%lld) for %s/%d on %s "
"is out of range",
__func__, (long long)val64,
addr, pfx->prefixlen, intface);
goto errexit;
}
pfx->preflifetime = (uint32_t)val64;
makeentry(entbuf, sizeof(entbuf), i, "pltimedecr");
if (agetflag(entbuf)) {
struct timespec now;
prog_clock_gettime(CLOCK_MONOTONIC, &now);
pfx->pltimeexpire =
now.tv_sec + pfx->preflifetime;
}
}
if (TAILQ_FIRST(&tmp->prefix) == NULL && !agetflag("noifprefix"))
get_prefix(tmp);
MAYHAVE(val64, "mtu", 0);
if (val64 < 0 || val64 > 0xffffffff) {
logit(LOG_ERR,
"<%s> mtu (%" PRIi64 ") on %s out of range",
__func__, val64, intface);
goto errexit;
}
tmp->linkmtu = (uint32_t)val64;
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) {
logit(LOG_ERR,
"<%s> advertised link mtu (%d) on %s is invalid (must "
"be between least MTU (%d) and physical link MTU (%d)",
__func__, tmp->linkmtu, intface,
IPV6_MMTU, tmp->phymtu);
goto errexit;
}
/* route information */
for (i = -1; i < MAXROUTE; i++) {
struct rtinfo *rti;
char oentbuf[256];
makeentry(entbuf, sizeof(entbuf), i, "rtprefix");
addr = (char *)agetstr(entbuf, &bp);
if (addr == NULL) {
makeentry(oentbuf, sizeof(oentbuf), i, "rtrprefix");
addr = (char *)agetstr(oentbuf, &bp);
if (addr) {
fprintf(stderr, "%s was obsoleted. Use %s.\n",
oentbuf, entbuf);
}
}
if (addr == NULL)
continue;
ELM_MALLOC(rti);
memset(rti, 0, sizeof(*rti));
/* link into chain */
TAILQ_INSERT_TAIL(&tmp->route, rti, next);
if (inet_pton(AF_INET6, addr, &rti->prefix) != 1) {
logit(LOG_ERR, "<%s> inet_pton failed for %s",
__func__, addr);
goto errexit;
}
#if 0
/*
* XXX: currently there's no restriction in route information
* prefix according to
* draft-ietf-ipngwg-router-selection-00.txt.
* However, I think the similar restriction be necessary.
*/
MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME);
if (IN6_IS_ADDR_MULTICAST(&rti->prefix)) {
logit(LOG_ERR,
"<%s> multicast route (%s) must "
"not be advertised on %s",
__func__, addr, intface);
goto errexit;
}
if (IN6_IS_ADDR_LINKLOCAL(&rti->prefix)) {
logit(LOG_NOTICE,
"<%s> link-local route (%s) will "
"be advertised on %s",
__func__, addr, intface);
goto errexit;
}
#endif
makeentry(entbuf, sizeof(entbuf), i, "rtplen");
/* XXX: 256 is a magic number for compatibility check. */
MAYHAVE(val, entbuf, 256);
if (val == 256) {
makeentry(oentbuf, sizeof(oentbuf), i, "rtrplen");
MAYHAVE(val, oentbuf, 256);
if (val != 256) {
fprintf(stderr, "%s was obsoleted. Use %s.\n",
oentbuf, entbuf);
} else
val = 64;
}
if (val < 0 || val > 128) {
logit(LOG_ERR, "<%s> prefixlen (%d) for %s on %s "
"out of range",
__func__, val, addr, intface);
goto errexit;
}
rti->prefixlen = (int)val;
makeentry(entbuf, sizeof(entbuf), i, "rtflags");
if ((flagstr = (char *)agetstr(entbuf, &bp))) {
val = 0;
if (strchr(flagstr, 'h'))
val |= ND_RA_FLAG_RTPREF_HIGH;
if (strchr(flagstr, 'l')) {
if ((val & ND_RA_FLAG_RTPREF_HIGH)) {
logit(LOG_ERR,
"<%s> the \'h\' and \'l\' route"
" preferences are exclusive",
__func__);
goto errexit;
}
val |= ND_RA_FLAG_RTPREF_LOW;
}
} else
MAYHAVE(val, entbuf, 256); /* XXX */
if (val == 256) {
makeentry(oentbuf, sizeof(oentbuf), i, "rtrflags");
MAYHAVE(val, oentbuf, 256);
if (val != 256) {
fprintf(stderr, "%s was obsoleted. Use %s.\n",
oentbuf, entbuf);
} else
val = 0;
}
rti->rtpref = val & ND_RA_FLAG_RTPREF_MASK;
if (rti->rtpref == ND_RA_FLAG_RTPREF_RSV) {
logit(LOG_ERR, "<%s> invalid route preference (%02x) "
"for %s/%d on %s",
__func__, rti->rtpref, addr,
rti->prefixlen, intface);
goto errexit;
}
/*
* Since the spec does not a default value, we should make
* this entry mandatory. However, FreeBSD 4.4 has shipped
* with this field being optional, we use the router lifetime
* as an ad-hoc default value with a warning message.
*/
makeentry(entbuf, sizeof(entbuf), i, "rtltime");
MAYHAVE(val64, entbuf, -1);
if (val64 == -1) {
makeentry(oentbuf, sizeof(oentbuf), i, "rtrltime");
MAYHAVE(val64, oentbuf, -1);
if (val64 != -1) {
fprintf(stderr, "%s was obsoleted. Use %s.\n",
oentbuf, entbuf);
} else {
fprintf(stderr, "%s should be specified "
"for interface %s.\n",
entbuf, intface);
val64 = tmp->lifetime;
}
}
if (val64 < 0 || val64 > 0xffffffff) {
logit(LOG_ERR, "<%s> route lifetime (%lld) for "
"%s/%d on %s out of range", __func__,
(long long)val64, addr, rti->prefixlen, intface);
goto errexit;
}
rti->ltime = (uint32_t)val64;
}
/* RDNSS */
for (i = -1; i < MAXRDNSS; i++) {
struct rdnss_addr *rdnsa;
makeentry(entbuf, sizeof(entbuf), i, "rdnss");
addr = (char *)agetstr(entbuf, &bp);
if (addr == NULL)
continue;
ELM_MALLOC(rdnss);
TAILQ_INSERT_TAIL(&tmp->rdnss, rdnss, next);
TAILQ_INIT(&rdnss->list);
for (ap = addr; ap - addr < (ssize_t)strlen(addr); ap += c+1) {
c = strcspn(ap, ",");
strncpy(abuf, ap, c);
abuf[c] = '\0';
ELM_MALLOC(rdnsa);
TAILQ_INSERT_TAIL(&rdnss->list, rdnsa, next);
if (inet_pton(AF_INET6, abuf, &rdnsa->addr) != 1) {
logit(LOG_ERR, "<%s> inet_pton failed for %s",
__func__, addr);
goto errexit;
}
}
makeentry(entbuf, sizeof(entbuf), i, "rdnssltime");
MAYHAVE(val64, entbuf, tmp->maxinterval * 3 / 2);
if (val64 < 0 || val64 > 0xffffffff) {
logit(LOG_ERR, "<%s> %s (%lld) on %s is invalid",
__func__, entbuf, (long long)val64, intface);
goto errexit;
}
rdnss->lifetime = (uint32_t)val64;
}
/* DNSSL */
TAILQ_INIT(&tmp->dnssl);
for (i = -1; i < MAXDNSSL; i++) {
struct dnssl_domain *dnsd;
makeentry(entbuf, sizeof(entbuf), i, "dnssl");
addr = (char *)agetstr(entbuf, &bp);
if (addr == NULL)
continue;
ELM_MALLOC(dnssl);
TAILQ_INSERT_TAIL(&tmp->dnssl, dnssl, next);
TAILQ_INIT(&dnssl->list);
for (ap = addr; ap - addr < (ssize_t)strlen(addr); ap += c+1) {
c = strcspn(ap, ",");
strncpy(abuf, ap, c);
abuf[c] = '\0';
ELM_MALLOC(dnsd);
TAILQ_INSERT_TAIL(&dnssl->list, dnsd, next);
dnsd->len = encode_domain(dnsd->domain, abuf);
}
makeentry(entbuf, sizeof(entbuf), i, "dnsslltime");
MAYHAVE(val64, entbuf, tmp->maxinterval * 3 / 2);
if (val64 < 0 || val64 > 0xffffffff) {
logit(LOG_ERR, "<%s> %s (%lld) on %s is invalid",
__func__, entbuf, (long long)val64, intface);
goto errexit;
}
dnssl->lifetime = (uint32_t)val64;
}
TAILQ_FOREACH(rai, &ralist, next) {
if (rai->ifindex == tmp->ifindex) {
TAILQ_REMOVE(&ralist, rai, next);
if (Cflag) {
free_rainfo(rai);
rai = NULL;
break;
}
/* If we already have a leaving RA use that
* as this config hasn't been advertised */
if (rai->leaving) {
tmp->leaving = rai->leaving;
free_rainfo(rai);
rai = tmp->leaving;
rai->leaving_for = tmp;
break;
}
rai->lifetime = 0;
TAILQ_FOREACH(rdnss, &rai->rdnss, next)
rdnss->lifetime = 0;
TAILQ_FOREACH(dnssl, &rai->dnssl, next)
dnssl->lifetime = 0;
rai->leaving_for = tmp;
tmp->leaving = rai;
rai->initcounter = MAX_INITIAL_RTR_ADVERTISEMENTS;
rai->mininterval = MIN_DELAY_BETWEEN_RAS;
rai->maxinterval = MIN_DELAY_BETWEEN_RAS;
rai->leaving_adv = MAX_FINAL_RTR_ADVERTISEMENTS;
if (rai->timer == NULL)
rai->timer = rtadvd_add_timer(ra_timeout,
ra_timer_update,
rai, rai);
ra_timer_update((void *)rai, &rai->timer->tm);
rtadvd_set_timer(&rai->timer->tm, rai->timer);
break;
}
}
/* okey */
TAILQ_INSERT_TAIL(&ralist, tmp, next);
/* construct the sending packet */
make_packet(tmp);
/* set timer */
if (rai)
return;
tmp->timer = rtadvd_add_timer(ra_timeout, ra_timer_update,
tmp, tmp);
ra_timer_set_short_delay(tmp, tmp->timer);
tmp->timer_sol = rtadvd_add_timer(ra_timeout_sol, NULL, tmp, NULL);
return;
errexit:
if (exithard)
exit(1);
free_rainfo(tmp);
}
void
get_prefix(struct rainfo *rai)
{
struct ifaddrs *ifap, *ifa;
struct prefix *pp;
struct in6_addr *a;
unsigned char *p, *ep, *m, *lim;
char ntopbuf[INET6_ADDRSTRLEN];
if (getifaddrs(&ifap) < 0) {
logit(LOG_ERR,
"<%s> can't get interface addresses",
__func__);
exit(1);
}
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
int plen;
if (strcmp(ifa->ifa_name, rai->ifname) != 0)
continue;
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
a = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
if (IN6_IS_ADDR_LINKLOCAL(a))
continue;
/* get prefix length */
m = (unsigned char *)&((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
lim = (unsigned char *)(ifa->ifa_netmask) + ifa->ifa_netmask->sa_len;
plen = prefixlen(m, lim);
if (plen <= 0 || plen > 128) {
logit(LOG_ERR, "<%s> failed to get prefixlen "
"or prefix is invalid",
__func__);
exit(1);
}
if (plen == 128) /* XXX */
continue;
if (find_prefix(rai, a, plen)) {
/* ignore a duplicated prefix. */
continue;
}
/* allocate memory to store prefix info. */
if ((pp = calloc(1, sizeof(*pp))) == NULL) {
logit(LOG_ERR,
"<%s> can't get allocate buffer for prefix",
__func__);
exit(1);
}
/* set prefix, sweep bits outside of prefixlen */
pp->prefixlen = plen;
memcpy(&pp->prefix, a, sizeof(*a));
if (1)
{
p = (unsigned char *)&pp->prefix;
ep = (unsigned char *)(&pp->prefix + 1);
while (m < lim && p < ep)
*p++ &= *m++;
while (p < ep)
*p++ = 0x00;
}
if (!inet_ntop(AF_INET6, &pp->prefix, ntopbuf,
sizeof(ntopbuf))) {
logit(LOG_ERR, "<%s> inet_ntop failed", __func__);
exit(1);
}
logit(LOG_DEBUG,
"<%s> add %s/%d to prefix list on %s",
__func__, ntopbuf, pp->prefixlen, rai->ifname);
/* set other fields with protocol defaults */
pp->validlifetime = DEF_ADVVALIDLIFETIME;
pp->preflifetime = DEF_ADVPREFERREDLIFETIME;
pp->onlinkflg = 1;
pp->autoconfflg = 1;
pp->origin = PREFIX_FROM_KERNEL;
pp->rainfo = rai;
/* link into chain */
TAILQ_INSERT_TAIL(&rai->prefix, pp, next);
rai->pfxs++;
}
freeifaddrs(ifap);
}
static void
makeentry(char *buf, size_t len, int id, const char *string)
{
if (id < 0)
strlcpy(buf, string, len);
else
snprintf(buf, len, "%s%d", string, id);
}
/*
* 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 prefix *prefix)
{
char ntopbuf[INET6_ADDRSTRLEN];
struct rainfo *rai = prefix->rainfo;
TAILQ_REMOVE(&rai->prefix, prefix, next);
rai->pfxs--;
logit(LOG_DEBUG, "<%s> prefix %s/%d was deleted on %s",
__func__, inet_ntop(AF_INET6, &prefix->prefix,
ntopbuf, INET6_ADDRSTRLEN),
prefix->prefixlen, rai->ifname);
rtadvd_remove_timer(&prefix->timer);
free(prefix);
}
void
invalidate_prefix(struct prefix *prefix)
{
char ntopbuf[INET6_ADDRSTRLEN];
struct timespec timo;
struct rainfo *rai = prefix->rainfo;
if (prefix->timer) { /* sanity check */
logit(LOG_ERR,
"<%s> assumption failure: timer already exists",
__func__);
exit(1);
}
logit(LOG_DEBUG, "<%s> prefix %s/%d was invalidated on %s, "
"will expire in %ld seconds", __func__,
inet_ntop(AF_INET6, &prefix->prefix, ntopbuf, INET6_ADDRSTRLEN),
prefix->prefixlen, rai->ifname, (long)prefix_timo);
/* set the expiration timer */
prefix->timer = rtadvd_add_timer(prefix_timeout, NULL, prefix, NULL);
if (prefix->timer == NULL) {
logit(LOG_ERR, "<%s> failed to add a timer for a prefix. "
"remove the prefix", __func__);
delete_prefix(prefix);
}
timo.tv_sec = prefix_timo;
timo.tv_nsec = 0;
rtadvd_set_timer(&timo, prefix->timer);
}
static struct rtadvd_timer *
prefix_timeout(void *arg)
{
struct prefix *prefix = (struct prefix *)arg;
delete_prefix(prefix);
return(NULL);
}
void
update_prefix(struct prefix * prefix)
{
char ntopbuf[INET6_ADDRSTRLEN];
struct rainfo *rai = prefix->rainfo;
if (prefix->timer == NULL) { /* sanity check */
logit(LOG_ERR,
"<%s> assumption failure: timer does not exist",
__func__);
exit(1);
}
logit(LOG_DEBUG, "<%s> prefix %s/%d was re-enabled on %s",
__func__, inet_ntop(AF_INET6, &prefix->prefix, ntopbuf,
INET6_ADDRSTRLEN), prefix->prefixlen, rai->ifname);
/* stop the expiration timer */
rtadvd_remove_timer(&prefix->timer);
}
/*
* Add a prefix to the list of specified interface and reconstruct
* the outgoing packet.
* The prefix must not be in the list.
* XXX: other parameters of the prefix(e.g. lifetime) should be
* able to be specified.
*/
void
add_prefix(struct rainfo *rai, int ifindex, struct in6_addr *addr, int plen)
{
struct prefix *prefix;
char ntopbuf[INET6_ADDRSTRLEN];
if ((prefix = calloc(1, sizeof(*prefix))) == NULL) {
logit(LOG_ERR, "<%s> memory allocation failed",
__func__);
return; /* XXX: error or exit? */
}
prefix->prefix = *addr;
prefix->prefixlen = plen;
prefix->validlifetime = DEF_ADVVALIDLIFETIME;
prefix->preflifetime = DEF_ADVPREFERREDLIFETIME;
prefix->onlinkflg = 1;
prefix->autoconfflg = 0;
prefix->origin = PREFIX_FROM_DYNAMIC;
prefix->rainfo = rai;
TAILQ_INSERT_TAIL(&rai->prefix, prefix, next);
rai->pfxs++;
logit(LOG_DEBUG, "<%s> new prefix %s/%d was added on %s",
__func__, inet_ntop(AF_INET6, addr, ntopbuf, INET6_ADDRSTRLEN),
plen, rai->ifname);
/* free the previous packet */
free(rai->ra_data);
rai->ra_data = NULL;
/* reconstruct the packet */
make_packet(rai);
}
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;
struct nd_opt_route_info *ndopt_rti;
struct rtinfo *rti;
struct nd_opt_rdnss *ndopt_rdnss;
struct rdnss *rdns;
struct rdnss_addr *rdnsa;
struct nd_opt_dnssl *ndopt_dnssl;
struct dnssl *dnsl;
struct dnssl_domain *dnsd;
size_t len, plen;
/* calculate total length */
packlen = sizeof(struct nd_router_advert);
if (rainfo->advlinkopt) {
if ((lladdroptlen = lladdropt_length(rainfo->sdl)) == 0) {
logit(LOG_INFO,
"<%s> link-layer address option has"
" null length on %s. Treat as not included.",
__func__, rainfo->ifname);
rainfo->advlinkopt = 0;
}
packlen += lladdroptlen;
}
if (TAILQ_FIRST(&rainfo->prefix) != NULL)
packlen += sizeof(struct nd_opt_prefix_info) * rainfo->pfxs;
if (rainfo->linkmtu)
packlen += sizeof(struct nd_opt_mtu);
TAILQ_FOREACH(rti, &rainfo->route, next)
packlen += sizeof(struct nd_opt_route_info) +
((rti->prefixlen + 0x3f) >> 6) * 8;
TAILQ_FOREACH(rdns, &rainfo->rdnss, next) {
packlen += sizeof(struct nd_opt_rdnss);
TAILQ_FOREACH(rdnsa, &rdns->list, next)
packlen += sizeof(rdnsa->addr);
}
TAILQ_FOREACH(dnsl, &rainfo->dnssl, next) {
packlen += sizeof(struct nd_opt_dnssl);
len = 0;
TAILQ_FOREACH(dnsd, &dnsl->list, next)
len += dnsd->len;
len += len % 8 ? 8 - len % 8 : 0;
packlen += len;
}
/* allocate memory for the packet */
if ((buf = realloc(rainfo->ra_data, packlen)) == NULL) {
logit(LOG_ERR,
"<%s> can't get enough memory for an RA packet %m",
__func__);
exit(1);
}
rainfo->ra_data = buf;
/* XXX: what if packlen > 576? */
rainfo->ra_datalen = packlen;
#define CHECKLEN(size) \
do { \
if (buf + size > rainfo->ra_data + packlen) { \
logit(LOG_ERR, \
"<%s, %d> RA packet does not fit in %zu",\
__func__, __LINE__, packlen); \
exit(1); \
} \
} while (/*CONSTCOND*/0)
/*
* construct the packet
*/
CHECKLEN(sizeof(*ra));
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 = (uint8_t)(0xff & rainfo->hoplimit);
ra->nd_ra_flags_reserved = 0; /* just in case */
/*
* XXX: the router preference field, which is a 2-bit field, should be
* initialized before other fields.
*/
ra->nd_ra_flags_reserved = 0xff & rainfo->rtpref;
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) {
CHECKLEN(sizeof(struct nd_opt_hdr));
lladdropt_fill(rainfo->sdl, (struct nd_opt_hdr *)buf);
buf += lladdroptlen;
}
if (rainfo->linkmtu) {
CHECKLEN(sizeof(*ndopt_mtu));
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 = htonl(rainfo->linkmtu);
buf += sizeof(struct nd_opt_mtu);
}
TAILQ_FOREACH(pfx, &rainfo->prefix, next) {
uint32_t vltime, pltime;
struct timespec now;
CHECKLEN(sizeof(*ndopt_pi));
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;
if (pfx->timer)
vltime = 0;
else {
if (pfx->vltimeexpire || pfx->pltimeexpire)
prog_clock_gettime(CLOCK_MONOTONIC, &now);
if (pfx->vltimeexpire == 0)
vltime = pfx->validlifetime;
else
vltime = (pfx->vltimeexpire > now.tv_sec) ?
pfx->vltimeexpire - now.tv_sec : 0;
}
if (pfx->timer)
pltime = 0;
else {
if (pfx->pltimeexpire == 0)
pltime = pfx->preflifetime;
else
pltime = (pfx->pltimeexpire > now.tv_sec) ?
pfx->pltimeexpire - now.tv_sec : 0;
}
if (vltime < pltime) {
/*
* this can happen if vltime is decrement but pltime
* is not.
*/
pltime = vltime;
}
ndopt_pi->nd_opt_pi_valid_time = htonl(vltime);
ndopt_pi->nd_opt_pi_preferred_time = htonl(pltime);
ndopt_pi->nd_opt_pi_reserved2 = 0;
ndopt_pi->nd_opt_pi_prefix = pfx->prefix;
buf += sizeof(struct nd_opt_prefix_info);
}
TAILQ_FOREACH(rti, &rainfo->route, next) {
uint8_t psize = (rti->prefixlen + 0x3f) >> 6;
CHECKLEN(sizeof(*ndopt_rti));
ndopt_rti = (struct nd_opt_route_info *)buf;
ndopt_rti->nd_opt_rti_type = ND_OPT_ROUTE_INFO;
ndopt_rti->nd_opt_rti_len = 1 + psize;
ndopt_rti->nd_opt_rti_prefixlen = rti->prefixlen;
ndopt_rti->nd_opt_rti_flags = 0xff & rti->rtpref;
ndopt_rti->nd_opt_rti_lifetime = htonl(rti->ltime);
memcpy(ndopt_rti + 1, &rti->prefix, psize * 8);
buf += sizeof(struct nd_opt_route_info) + psize * 8;
}
TAILQ_FOREACH(rdns, &rainfo->rdnss, next) {
CHECKLEN(sizeof(*ndopt_rdnss));
ndopt_rdnss = (struct nd_opt_rdnss *)buf;
ndopt_rdnss->nd_opt_rdnss_type = ND_OPT_RDNSS;
ndopt_rdnss->nd_opt_rdnss_len = 1;
ndopt_rdnss->nd_opt_rdnss_reserved = 0;
ndopt_rdnss->nd_opt_rdnss_lifetime = htonl(rdns->lifetime);
buf += sizeof(*ndopt_rdnss);
TAILQ_FOREACH(rdnsa, &rdns->list, next) {
CHECKLEN(sizeof(rdnsa->addr));
memcpy(buf, &rdnsa->addr, sizeof(rdnsa->addr));
ndopt_rdnss->nd_opt_rdnss_len += 2;
buf += sizeof(rdnsa->addr);
}
}
TAILQ_FOREACH(dnsl, &rainfo->dnssl, next) {
CHECKLEN(sizeof(*ndopt_dnssl));
ndopt_dnssl = (struct nd_opt_dnssl *)buf;
ndopt_dnssl->nd_opt_dnssl_type = ND_OPT_DNSSL;
ndopt_dnssl->nd_opt_dnssl_len = 0;
ndopt_dnssl->nd_opt_dnssl_reserved = 0;
ndopt_dnssl->nd_opt_dnssl_lifetime = htonl(dnsl->lifetime);
buf += sizeof(*ndopt_dnssl);
TAILQ_FOREACH(dnsd, &dnsl->list, next) {
CHECKLEN(dnsd->len);
memcpy(buf, dnsd->domain, dnsd->len);
buf += dnsd->len;
}
/* Ensure our length is padded correctly */
len = buf - (char *)ndopt_dnssl;
plen = len % 8 ? 8 - len % 8 : 0;
CHECKLEN(plen);
memset(buf, 0, plen);
buf += plen;
ndopt_dnssl->nd_opt_dnssl_len = (len + plen) / 8;
}
memset(buf, 0, packlen - (buf - rainfo->ra_data));
}
static int
getinet6sysctl(int code)
{
const int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, code };
int value;
size_t size;
size = sizeof(value);
if (prog_sysctl(mib, __arraycount(mib), &value, &size, NULL, 0)
< 0) {
logit(LOG_ERR, "<%s>: failed to get ip6 sysctl(%d): %m",
__func__, code);
return -1;
}
else
return value;
}
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