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freebsd-dev/usr.sbin/rtadvd/config.c
Don Lewis 8afa1c3d7a Use strlcpy() instead of strncpy() when copying ifname to ensure 
that it is NUL terminated.  Additional NUL padding is not required
for short names.

MFC after:	1 week
2016-05-15 22:06:21 +00:00

1542 lines
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/* $FreeBSD$ */
/* $KAME: config.c,v 1.84 2003/08/05 12:34:23 itojun Exp $ */
/*
* Copyright (C) 1998 WIDE Project.
* Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org>
* 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 <net/if.h>
#include <net/route.h>
#include <net/if_dl.h>
#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 <inttypes.h>
#include <netdb.h>
#include <string.h>
#include <search.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <ifaddrs.h>
#include "rtadvd.h"
#include "advcap.h"
#include "timer.h"
#include "if.h"
#include "config.h"
/* label of tcapcode + number + domain name + zero octet */
static char entbuf[10 + 3 + NI_MAXHOST + 1];
static char oentbuf[10 + 3 + NI_MAXHOST + 1];
static char abuf[DNAME_LABELENC_MAXLEN];
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 ssize_t dname_labelenc(char *, const char *);
/* Encode domain name label encoding in RFC 1035 Section 3.1 */
static ssize_t
dname_labelenc(char *dst, const char *src)
{
char *dst_origin;
char *p;
size_t len;
dst_origin = dst;
len = strlen(src);
if (len + len / 64 + 1 + 1 > DNAME_LABELENC_MAXLEN)
return (-1);
/* Length fields per 63 octets + '\0' (<= DNAME_LABELENC_MAXLEN) */
memset(dst, 0, len + len / 64 + 1 + 1);
syslog(LOG_DEBUG, "<%s> labelenc = %s", __func__, src);
while (src && (len = strlen(src)) != 0) {
/* Put a length field with 63 octet limitation first. */
p = strchr(src, '.');
if (p == NULL)
*dst = len = MIN(63, len);
else
*dst = len = MIN(63, p - src);
if (dst + 1 + len < dst_origin + DNAME_LABELENC_MAXLEN)
dst++;
else
return (-1);
/* Copy 63 octets at most. */
memcpy(dst, src, len);
dst += len;
if (p == NULL) /* the last label */
break;
src = p + 1;
}
/* Always need a 0-length label at the tail. */
*dst++ = '\0';
syslog(LOG_DEBUG, "<%s> labellen = %td", __func__, dst - dst_origin);
return (dst - dst_origin);
}
#define MUSTHAVE(var, cap) \
do { \
int64_t t; \
if ((t = agetnum(cap)) < 0) { \
fprintf(stderr, "rtadvd: need %s for interface %s\n", \
cap, intface); \
exit(1); \
} \
var = t; \
} while (0)
#define MAYHAVE(var, cap, def) \
do { \
if ((var = agetnum(cap)) < 0) \
var = def; \
} while (0)
int
loadconfig_index(int idx)
{
char ifname[IFNAMSIZ];
syslog(LOG_DEBUG, "<%s> enter", __func__);
if (if_indextoname(idx, ifname) != NULL)
return (loadconfig_ifname(ifname));
else
return (1);
}
int
loadconfig_ifname(char *ifname)
{
struct ifinfo *ifi;
syslog(LOG_DEBUG, "<%s> enter", __func__);
update_ifinfo(&ifilist, UPDATE_IFINFO_ALL);
TAILQ_FOREACH(ifi, &ifilist, ifi_next) {
/* NULL means all IFs will be processed. */
if (ifname != NULL &&
strcmp(ifi->ifi_ifname, ifname) != 0)
continue;
if (!ifi->ifi_persist) {
syslog(LOG_INFO,
"<%s> %s is not a target interface. "
"Ignored at this moment.", __func__,
ifi->ifi_ifname);
continue;
}
if (ifi->ifi_ifindex == 0) {
syslog(LOG_ERR,
"<%s> %s not found. "
"Ignored at this moment.", __func__,
ifi->ifi_ifname);
continue;
}
if (getconfig(ifi) == NULL) {
syslog(LOG_ERR,
"<%s> invalid configuration for %s. "
"Ignored at this moment.", __func__,
ifi->ifi_ifname);
continue;
}
}
return (0);
}
int
rm_ifinfo_index(int idx)
{
struct ifinfo *ifi;
ifi = if_indextoifinfo(idx);
if (ifi == NULL) {
syslog(LOG_ERR, "<%s>: ifinfo not found (idx=%d)",
__func__, idx);
return (-1);
}
return (rm_ifinfo(ifi));
}
int
rm_ifinfo(struct ifinfo *ifi)
{
int error;
syslog(LOG_DEBUG, "<%s> enter (%s).", __func__, ifi->ifi_ifname);
switch (ifi->ifi_state) {
case IFI_STATE_UNCONFIGURED:
return (0);
break;
default:
ifi->ifi_state = IFI_STATE_UNCONFIGURED;
syslog(LOG_DEBUG,
"<%s> ifname=%s marked as UNCONFIGURED.",
__func__, ifi->ifi_ifname);
/* XXX: No MC leaving here because index is disappeared */
/* Inactivate timer */
rtadvd_remove_timer(ifi->ifi_ra_timer);
ifi->ifi_ra_timer = NULL;
break;
}
/* clean up ifi */
if (!ifi->ifi_persist) {
TAILQ_REMOVE(&ifilist, ifi, ifi_next);
syslog(LOG_DEBUG, "<%s>: ifinfo (idx=%d) removed.",
__func__, ifi->ifi_ifindex);
} else {
/* recreate an empty entry */
update_persist_ifinfo(&ifilist, ifi->ifi_ifname);
syslog(LOG_DEBUG, "<%s>: ifname=%s is persistent.",
__func__, ifi->ifi_ifname);
}
/* clean up rai if any */
switch (ifi->ifi_state) {
case IFI_STATE_CONFIGURED:
if (ifi->ifi_rainfo != NULL) {
error = rm_rainfo(ifi->ifi_rainfo);
if (error)
return (error);
ifi->ifi_rainfo = NULL;
}
break;
case IFI_STATE_TRANSITIVE:
if (ifi->ifi_rainfo == ifi->ifi_rainfo_trans) {
if (ifi->ifi_rainfo != NULL) {
error = rm_rainfo(ifi->ifi_rainfo);
if (error)
return (error);
ifi->ifi_rainfo = NULL;
ifi->ifi_rainfo_trans = NULL;
}
} else {
if (ifi->ifi_rainfo != NULL) {
error = rm_rainfo(ifi->ifi_rainfo);
if (error)
return (error);
ifi->ifi_rainfo = NULL;
}
if (ifi->ifi_rainfo_trans != NULL) {
error = rm_rainfo(ifi->ifi_rainfo_trans);
if (error)
return (error);
ifi->ifi_rainfo_trans = NULL;
}
}
}
syslog(LOG_DEBUG, "<%s> leave (%s).", __func__, ifi->ifi_ifname);
if (!ifi->ifi_persist)
free(ifi);
return (0);
}
int
rm_rainfo(struct rainfo *rai)
{
struct prefix *pfx;
struct soliciter *sol;
struct rdnss *rdn;
struct rdnss_addr *rdna;
struct dnssl *dns;
struct rtinfo *rti;
syslog(LOG_DEBUG, "<%s>: enter", __func__);
TAILQ_REMOVE(&railist, rai, rai_next);
if (rai->rai_ifinfo != NULL)
syslog(LOG_DEBUG, "<%s>: rainfo (idx=%d) removed.",
__func__, rai->rai_ifinfo->ifi_ifindex);
if (rai->rai_ra_data != NULL)
free(rai->rai_ra_data);
while ((pfx = TAILQ_FIRST(&rai->rai_prefix)) != NULL)
delete_prefix(pfx);
while ((sol = TAILQ_FIRST(&rai->rai_soliciter)) != NULL) {
TAILQ_REMOVE(&rai->rai_soliciter, sol, sol_next);
free(sol);
}
while ((rdn = TAILQ_FIRST(&rai->rai_rdnss)) != NULL) {
TAILQ_REMOVE(&rai->rai_rdnss, rdn, rd_next);
while ((rdna = TAILQ_FIRST(&rdn->rd_list)) != NULL) {
TAILQ_REMOVE(&rdn->rd_list, rdna, ra_next);
free(rdna);
}
free(rdn);
}
while ((dns = TAILQ_FIRST(&rai->rai_dnssl)) != NULL) {
TAILQ_REMOVE(&rai->rai_dnssl, dns, dn_next);
free(dns);
}
while ((rti = TAILQ_FIRST(&rai->rai_route)) != NULL) {
TAILQ_REMOVE(&rai->rai_route, rti, rti_next);
free(rti);
}
free(rai);
syslog(LOG_DEBUG, "<%s>: leave", __func__);
return (0);
}
struct ifinfo *
getconfig(struct ifinfo *ifi)
{
int stat, i;
int error;
char tbuf[BUFSIZ];
struct rainfo *rai;
struct rainfo *rai_old;
int32_t val;
int64_t val64;
char buf[BUFSIZ];
char *bp = buf;
char *addr, *flagstr;
if (ifi == NULL) /* if does not exist */
return (NULL);
if (ifi->ifi_state == IFI_STATE_TRANSITIVE &&
ifi->ifi_rainfo == NULL) {
syslog(LOG_INFO, "<%s> %s is shutting down. Skipped.",
__func__, ifi->ifi_ifname);
return (NULL);
}
if ((stat = agetent(tbuf, ifi->ifi_ifname)) <= 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",
__func__, ifi->ifi_ifname);
}
ELM_MALLOC(rai, exit(1));
TAILQ_INIT(&rai->rai_prefix);
TAILQ_INIT(&rai->rai_route);
TAILQ_INIT(&rai->rai_rdnss);
TAILQ_INIT(&rai->rai_dnssl);
TAILQ_INIT(&rai->rai_soliciter);
rai->rai_ifinfo = ifi;
/* gather on-link prefixes from the network interfaces. */
if (agetflag("noifprefix"))
rai->rai_advifprefix = 0;
else
rai->rai_advifprefix = 1;
/* get interface information */
if (agetflag("nolladdr"))
rai->rai_advlinkopt = 0;
else
rai->rai_advlinkopt = 1;
if (rai->rai_advlinkopt) {
if (ifi->ifi_sdl.sdl_type == 0) {
syslog(LOG_ERR,
"<%s> can't get information of %s",
__func__, ifi->ifi_ifname);
goto getconfig_free_rai;
}
}
/*
* set router configuration variables.
*/
MAYHAVE(val, "maxinterval", DEF_MAXRTRADVINTERVAL);
if (val < MIN_MAXINTERVAL || val > MAX_MAXINTERVAL) {
syslog(LOG_ERR,
"<%s> maxinterval (%" PRIu32 ") on %s is invalid "
"(must be between %u and %u)", __func__, val,
ifi->ifi_ifname, MIN_MAXINTERVAL, MAX_MAXINTERVAL);
goto getconfig_free_rai;
}
rai->rai_maxinterval = (uint16_t)val;
MAYHAVE(val, "mininterval", rai->rai_maxinterval/3);
if ((uint16_t)val < MIN_MININTERVAL ||
(uint16_t)val > (rai->rai_maxinterval * 3) / 4) {
syslog(LOG_ERR,
"<%s> mininterval (%" PRIu32 ") on %s is invalid "
"(must be between %d and %d)",
__func__, val, ifi->ifi_ifname, MIN_MININTERVAL,
(rai->rai_maxinterval * 3) / 4);
goto getconfig_free_rai;
}
rai->rai_mininterval = (uint16_t)val;
MAYHAVE(val, "chlim", DEF_ADVCURHOPLIMIT);
rai->rai_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)) {
syslog(LOG_ERR, "<%s> the \'h\' and \'l\'"
" router flags are exclusive", __func__);
goto getconfig_free_rai;
}
val |= ND_RA_FLAG_RTPREF_LOW;
}
} else
MAYHAVE(val, "raflags", 0);
rai->rai_managedflg = val & ND_RA_FLAG_MANAGED;
rai->rai_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
rai->rai_rtpref = val & ND_RA_FLAG_RTPREF_MASK;
if (rai->rai_rtpref == ND_RA_FLAG_RTPREF_RSV) {
syslog(LOG_ERR, "<%s> invalid router preference (%02x) on %s",
__func__, rai->rai_rtpref, ifi->ifi_ifname);
goto getconfig_free_rai;
}
MAYHAVE(val, "rltime", rai->rai_maxinterval * 3);
if ((uint16_t)val && ((uint16_t)val < rai->rai_maxinterval ||
(uint16_t)val > MAXROUTERLIFETIME)) {
syslog(LOG_ERR,
"<%s> router lifetime (%" PRIu32 ") on %s is invalid "
"(must be 0 or between %d and %d)",
__func__, val, ifi->ifi_ifname, rai->rai_maxinterval,
MAXROUTERLIFETIME);
goto getconfig_free_rai;
}
rai->rai_lifetime = val & 0xffff;
MAYHAVE(val, "rtime", DEF_ADVREACHABLETIME);
if (val < 0 || val > MAXREACHABLETIME) {
syslog(LOG_ERR,
"<%s> reachable time (%" PRIu32 ") on %s is invalid "
"(must be no greater than %d)",
__func__, val, ifi->ifi_ifname, MAXREACHABLETIME);
goto getconfig_free_rai;
}
rai->rai_reachabletime = (uint32_t)val;
MAYHAVE(val64, "retrans", DEF_ADVRETRANSTIMER);
if (val64 < 0 || val64 > 0xffffffff) {
syslog(LOG_ERR, "<%s> retrans time (%" PRIu64 ") on %s out of range",
__func__, val64, ifi->ifi_ifname);
goto getconfig_free_rai;
}
rai->rai_retranstimer = (uint32_t)val64;
if (agetnum("hapref") != -1 || agetnum("hatime") != -1) {
syslog(LOG_ERR,
"<%s> mobile-ip6 configuration not supported",
__func__);
goto getconfig_free_rai;
}
/* 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);
rai->rai_clockskew = val;
rai->rai_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 */
ELM_MALLOC(pfx, exit(1));
pfx->pfx_rainfo = rai;
pfx->pfx_origin = PREFIX_FROM_CONFIG;
if (inet_pton(AF_INET6, addr, &pfx->pfx_prefix) != 1) {
syslog(LOG_ERR,
"<%s> inet_pton failed for %s",
__func__, addr);
goto getconfig_free_pfx;
}
if (IN6_IS_ADDR_MULTICAST(&pfx->pfx_prefix)) {
syslog(LOG_ERR,
"<%s> multicast prefix (%s) must "
"not be advertised on %s",
__func__, addr, ifi->ifi_ifname);
goto getconfig_free_pfx;
}
if (IN6_IS_ADDR_LINKLOCAL(&pfx->pfx_prefix))
syslog(LOG_NOTICE,
"<%s> link-local prefix (%s) will be"
" advertised on %s",
__func__, addr, ifi->ifi_ifname);
makeentry(entbuf, sizeof(entbuf), i, "prefixlen");
MAYHAVE(val, entbuf, 64);
if (val < 0 || val > 128) {
syslog(LOG_ERR, "<%s> prefixlen (%" PRIu32 ") for %s "
"on %s out of range",
__func__, val, addr, ifi->ifi_ifname);
goto getconfig_free_pfx;
}
pfx->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->pfx_onlinkflg = val & ND_OPT_PI_FLAG_ONLINK;
pfx->pfx_autoconfflg = val & ND_OPT_PI_FLAG_AUTO;
makeentry(entbuf, sizeof(entbuf), i, "vltime");
MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME);
if (val64 < 0 || val64 > 0xffffffff) {
syslog(LOG_ERR, "<%s> vltime (%" PRIu64 ") for "
"%s/%d on %s is out of range",
__func__, val64,
addr, pfx->pfx_prefixlen, ifi->ifi_ifname);
goto getconfig_free_pfx;
}
pfx->pfx_validlifetime = (uint32_t)val64;
makeentry(entbuf, sizeof(entbuf), i, "vltimedecr");
if (agetflag(entbuf)) {
struct timespec now;
clock_gettime(CLOCK_MONOTONIC_FAST, &now);
pfx->pfx_vltimeexpire =
now.tv_sec + pfx->pfx_validlifetime;
}
makeentry(entbuf, sizeof(entbuf), i, "pltime");
MAYHAVE(val64, entbuf, DEF_ADVPREFERREDLIFETIME);
if (val64 < 0 || val64 > 0xffffffff) {
syslog(LOG_ERR,
"<%s> pltime (%" PRIu64 ") for %s/%d on %s "
"is out of range",
__func__, val64,
addr, pfx->pfx_prefixlen, ifi->ifi_ifname);
goto getconfig_free_pfx;
}
pfx->pfx_preflifetime = (uint32_t)val64;
makeentry(entbuf, sizeof(entbuf), i, "pltimedecr");
if (agetflag(entbuf)) {
struct timespec now;
clock_gettime(CLOCK_MONOTONIC_FAST, &now);
pfx->pfx_pltimeexpire =
now.tv_sec + pfx->pfx_preflifetime;
}
/* link into chain */
TAILQ_INSERT_TAIL(&rai->rai_prefix, pfx, pfx_next);
rai->rai_pfxs++;
continue;
getconfig_free_pfx:
free(pfx);
}
if (rai->rai_advifprefix && rai->rai_pfxs == 0)
get_prefix(rai);
MAYHAVE(val64, "mtu", 0);
if (val < 0 || val64 > 0xffffffff) {
syslog(LOG_ERR,
"<%s> mtu (%" PRIu64 ") on %s out of range",
__func__, val64, ifi->ifi_ifname);
goto getconfig_free_rai;
}
rai->rai_linkmtu = (uint32_t)val64;
if (rai->rai_linkmtu == 0) {
char *mtustr;
if ((mtustr = (char *)agetstr("mtu", &bp)) &&
strcmp(mtustr, "auto") == 0)
rai->rai_linkmtu = ifi->ifi_phymtu;
}
else if (rai->rai_linkmtu < IPV6_MMTU ||
rai->rai_linkmtu > ifi->ifi_phymtu) {
syslog(LOG_ERR,
"<%s> advertised link mtu (%" PRIu32 ") on %s is invalid (must "
"be between least MTU (%d) and physical link MTU (%d)",
__func__, rai->rai_linkmtu, ifi->ifi_ifname,
IPV6_MMTU, ifi->ifi_phymtu);
goto getconfig_free_rai;
}
#ifdef SIOCSIFINFO_IN6
{
struct in6_ndireq ndi;
int s;
if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
syslog(LOG_ERR, "<%s> socket: %s", __func__,
strerror(errno));
exit(1);
}
memset(&ndi, 0, sizeof(ndi));
strlcpy(ndi.ifname, ifi->ifi_ifname, sizeof(ndi.ifname));
if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&ndi) < 0)
syslog(LOG_INFO, "<%s> ioctl:SIOCGIFINFO_IN6 at %s: %s",
__func__, ifi->ifi_ifname, strerror(errno));
/* reflect the RA info to the host variables in kernel */
ndi.ndi.chlim = rai->rai_hoplimit;
ndi.ndi.retrans = rai->rai_retranstimer;
ndi.ndi.basereachable = rai->rai_reachabletime;
if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&ndi) < 0)
syslog(LOG_INFO, "<%s> ioctl:SIOCSIFINFO_IN6 at %s: %s",
__func__, ifi->ifi_ifname, strerror(errno));
close(s);
}
#endif
/* route information */
rai->rai_routes = 0;
for (i = -1; i < MAXROUTE; i++) {
struct rtinfo *rti;
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;
/* allocate memory to store prefix information */
ELM_MALLOC(rti, exit(1));
if (inet_pton(AF_INET6, addr, &rti->rti_prefix) != 1) {
syslog(LOG_ERR, "<%s> inet_pton failed for %s",
__func__, addr);
goto getconfig_free_rti;
}
#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)) {
syslog(LOG_ERR,
"<%s> multicast route (%s) must "
"not be advertised on %s",
__func__, addr, ifi->ifi_ifname);
goto getconfig_free_rti;
}
if (IN6_IS_ADDR_LINKLOCAL(&rti->prefix)) {
syslog(LOG_NOTICE,
"<%s> link-local route (%s) will "
"be advertised on %s",
__func__, addr, ifi->ifi_ifname);
goto getconfig_free_rti;
}
#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) {
syslog(LOG_ERR, "<%s> prefixlen (%" PRIu32 ") for %s on %s "
"out of range",
__func__, val, addr, ifi->ifi_ifname);
goto getconfig_free_rti;
}
rti->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)) {
syslog(LOG_ERR,
"<%s> the \'h\' and \'l\' route"
" preferences are exclusive",
__func__);
goto getconfig_free_rti;
}
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->rti_rtpref = val & ND_RA_FLAG_RTPREF_MASK;
if (rti->rti_rtpref == ND_RA_FLAG_RTPREF_RSV) {
syslog(LOG_ERR, "<%s> invalid route preference (%02x) "
"for %s/%d on %s",
__func__, rti->rti_rtpref, addr,
rti->rti_prefixlen, ifi->ifi_ifname);
goto getconfig_free_rti;
}
/*
* 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,
ifi->ifi_ifname);
val64 = rai->rai_lifetime;
}
}
if (val64 < 0 || val64 > 0xffffffff) {
syslog(LOG_ERR, "<%s> route lifetime (%" PRIu64 ") for "
"%s/%d on %s out of range", __func__,
val64, addr, rti->rti_prefixlen,
ifi->ifi_ifname);
goto getconfig_free_rti;
}
rti->rti_ltime = (uint32_t)val64;
/* link into chain */
TAILQ_INSERT_TAIL(&rai->rai_route, rti, rti_next);
rai->rai_routes++;
continue;
getconfig_free_rti:
free(rti);
}
/* DNS server and DNS search list information */
for (i = -1; i < MAXRDNSSENT ; i++) {
struct rdnss *rdn;
struct rdnss_addr *rdna;
char *ap;
int c;
makeentry(entbuf, sizeof(entbuf), i, "rdnss");
addr = (char *)agetstr(entbuf, &bp);
if (addr == NULL)
continue;
ELM_MALLOC(rdn, exit(1));
TAILQ_INIT(&rdn->rd_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(rdna, goto getconfig_free_rdn);
if (inet_pton(AF_INET6, abuf, &rdna->ra_dns) != 1) {
syslog(LOG_ERR, "<%s> inet_pton failed for %s",
__func__, abuf);
free(rdna);
goto getconfig_free_rdn;
}
TAILQ_INSERT_TAIL(&rdn->rd_list, rdna, ra_next);
}
makeentry(entbuf, sizeof(entbuf), i, "rdnssltime");
MAYHAVE(val, entbuf, (rai->rai_maxinterval * 3 / 2));
if ((uint16_t)val < rai->rai_maxinterval ||
(uint16_t)val > rai->rai_maxinterval * 2) {
syslog(LOG_ERR, "%s (%" PRIu16 ") on %s is invalid "
"(must be between %d and %d)",
entbuf, val, ifi->ifi_ifname, rai->rai_maxinterval,
rai->rai_maxinterval * 2);
goto getconfig_free_rdn;
}
rdn->rd_ltime = val;
/* link into chain */
TAILQ_INSERT_TAIL(&rai->rai_rdnss, rdn, rd_next);
continue;
getconfig_free_rdn:
while ((rdna = TAILQ_FIRST(&rdn->rd_list)) != NULL) {
TAILQ_REMOVE(&rdn->rd_list, rdna, ra_next);
free(rdna);
}
free(rdn);
}
for (i = -1; i < MAXDNSSLENT ; i++) {
struct dnssl *dns;
struct dnssl_addr *dnsa;
char *ap;
int c;
makeentry(entbuf, sizeof(entbuf), i, "dnssl");
addr = (char *)agetstr(entbuf, &bp);
if (addr == NULL)
continue;
ELM_MALLOC(dns, exit(1));
TAILQ_INIT(&dns->dn_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(dnsa, goto getconfig_free_dns);
dnsa->da_len = dname_labelenc(dnsa->da_dom, abuf);
if (dnsa->da_len < 0) {
syslog(LOG_ERR, "Invalid dnssl entry: %s",
abuf);
goto getconfig_free_dns;
}
syslog(LOG_DEBUG, "<%s>: dnsa->da_len = %d", __func__,
dnsa->da_len);
TAILQ_INSERT_TAIL(&dns->dn_list, dnsa, da_next);
}
makeentry(entbuf, sizeof(entbuf), i, "dnsslltime");
MAYHAVE(val, entbuf, (rai->rai_maxinterval * 3 / 2));
if ((uint16_t)val < rai->rai_maxinterval ||
(uint16_t)val > rai->rai_maxinterval * 2) {
syslog(LOG_ERR, "%s (%" PRIu16 ") on %s is invalid "
"(must be between %d and %d)",
entbuf, val, ifi->ifi_ifname, rai->rai_maxinterval,
rai->rai_maxinterval * 2);
goto getconfig_free_dns;
}
dns->dn_ltime = val;
/* link into chain */
TAILQ_INSERT_TAIL(&rai->rai_dnssl, dns, dn_next);
continue;
getconfig_free_dns:
while ((dnsa = TAILQ_FIRST(&dns->dn_list)) != NULL) {
TAILQ_REMOVE(&dns->dn_list, dnsa, da_next);
free(dnsa);
}
free(dns);
}
/* construct the sending packet */
make_packet(rai);
/*
* If an entry with the same ifindex exists, remove it first.
* Before the removal, RDNSS and DNSSL options with
* zero-lifetime will be sent.
*/
switch (ifi->ifi_state) {
case IFI_STATE_UNCONFIGURED:
/* UNCONFIGURED -> TRANSITIVE */
error = sock_mc_join(&sock, ifi->ifi_ifindex);
if (error)
exit(1);
ifi->ifi_state = IFI_STATE_TRANSITIVE;
ifi->ifi_burstcount = MAX_INITIAL_RTR_ADVERTISEMENTS;
ifi->ifi_burstinterval = MAX_INITIAL_RTR_ADVERT_INTERVAL;
/* The same two rai mean initial burst */
ifi->ifi_rainfo = rai;
ifi->ifi_rainfo_trans = rai;
TAILQ_INSERT_TAIL(&railist, rai, rai_next);
if (ifi->ifi_ra_timer == NULL)
ifi->ifi_ra_timer = rtadvd_add_timer(ra_timeout,
ra_timer_update, ifi, ifi);
ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm);
rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm,
ifi->ifi_ra_timer);
syslog(LOG_DEBUG,
"<%s> ifname=%s marked as TRANSITIVE (initial burst).",
__func__, ifi->ifi_ifname);
break;
case IFI_STATE_CONFIGURED:
/* CONFIGURED -> TRANSITIVE */
rai_old = ifi->ifi_rainfo;
if (rai_old == NULL) {
syslog(LOG_ERR,
"<%s> ifi_rainfo is NULL"
" in IFI_STATE_CONFIGURED.", __func__);
ifi = NULL;
break;
} else {
struct rdnss *rdn;
struct dnssl *dns;
rai_old->rai_lifetime = 0;
TAILQ_FOREACH(rdn, &rai_old->rai_rdnss, rd_next)
rdn->rd_ltime = 0;
TAILQ_FOREACH(dns, &rai_old->rai_dnssl, dn_next)
dns->dn_ltime = 0;
ifi->ifi_rainfo_trans = rai_old;
ifi->ifi_state = IFI_STATE_TRANSITIVE;
ifi->ifi_burstcount = MAX_FINAL_RTR_ADVERTISEMENTS;
ifi->ifi_burstinterval = MIN_DELAY_BETWEEN_RAS;
ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm);
rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm,
ifi->ifi_ra_timer);
syslog(LOG_DEBUG,
"<%s> ifname=%s marked as TRANSITIVE"
" (transitional burst)",
__func__, ifi->ifi_ifname);
}
ifi->ifi_rainfo = rai;
TAILQ_INSERT_TAIL(&railist, rai, rai_next);
break;
case IFI_STATE_TRANSITIVE:
if (ifi->ifi_rainfo != NULL) {
if (ifi->ifi_rainfo == ifi->ifi_rainfo_trans) {
/* Reinitialize initial burst */
rm_rainfo(ifi->ifi_rainfo);
ifi->ifi_rainfo = rai;
ifi->ifi_rainfo_trans = rai;
ifi->ifi_burstcount =
MAX_INITIAL_RTR_ADVERTISEMENTS;
ifi->ifi_burstinterval =
MAX_INITIAL_RTR_ADVERT_INTERVAL;
} else {
/* Replace ifi_rainfo with the new one */
rm_rainfo(ifi->ifi_rainfo);
ifi->ifi_rainfo = rai;
}
TAILQ_INSERT_TAIL(&railist, rai, rai_next);
ra_timer_update(ifi, &ifi->ifi_ra_timer->rat_tm);
rtadvd_set_timer(&ifi->ifi_ra_timer->rat_tm,
ifi->ifi_ra_timer);
} else {
/* XXX: NOTREACHED. Being shut down. */
syslog(LOG_ERR,
"<%s> %s is shutting down. Skipped.",
__func__, ifi->ifi_ifname);
rm_rainfo(rai);
return (NULL);
}
break;
}
return (ifi);
getconfig_free_rai:
free(rai);
return (NULL);
}
void
get_prefix(struct rainfo *rai)
{
struct ifaddrs *ifap, *ifa;
struct prefix *pfx;
struct in6_addr *a;
struct ifinfo *ifi;
char *p, *ep, *m, *lim;
char ntopbuf[INET6_ADDRSTRLEN];
if (getifaddrs(&ifap) < 0) {
syslog(LOG_ERR,
"<%s> can't get interface addresses",
__func__);
exit(1);
}
ifi = rai->rai_ifinfo;
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
int plen;
if (strcmp(ifa->ifa_name, ifi->ifi_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 = (char *)&((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
lim = (char *)(ifa->ifa_netmask) + ifa->ifa_netmask->sa_len;
plen = prefixlen(m, lim);
if (plen <= 0 || plen > 128) {
syslog(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. */
ELM_MALLOC(pfx, exit(1));
/* set prefix, sweep bits outside of prefixlen */
pfx->pfx_prefixlen = plen;
memcpy(&pfx->pfx_prefix, a, sizeof(*a));
p = (char *)&pfx->pfx_prefix;
ep = (char *)(&pfx->pfx_prefix + 1);
while (m < lim && p < ep)
*p++ &= *m++;
while (p < ep)
*p++ = 0x00;
if (!inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf,
sizeof(ntopbuf))) {
syslog(LOG_ERR, "<%s> inet_ntop failed", __func__);
exit(1);
}
syslog(LOG_DEBUG,
"<%s> add %s/%d to prefix list on %s",
__func__, ntopbuf, pfx->pfx_prefixlen, ifi->ifi_ifname);
/* set other fields with protocol defaults */
pfx->pfx_validlifetime = DEF_ADVVALIDLIFETIME;
pfx->pfx_preflifetime = DEF_ADVPREFERREDLIFETIME;
pfx->pfx_onlinkflg = 1;
pfx->pfx_autoconfflg = 1;
pfx->pfx_origin = PREFIX_FROM_KERNEL;
pfx->pfx_rainfo = rai;
/* link into chain */
TAILQ_INSERT_TAIL(&rai->rai_prefix, pfx, pfx_next);
/* counter increment */
rai->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);
}
/*
* 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.
*/
static void
add_prefix(struct rainfo *rai, struct in6_prefixreq *ipr)
{
struct prefix *pfx;
struct ifinfo *ifi;
char ntopbuf[INET6_ADDRSTRLEN];
ifi = rai->rai_ifinfo;
ELM_MALLOC(pfx, return);
pfx->pfx_prefix = ipr->ipr_prefix.sin6_addr;
pfx->pfx_prefixlen = ipr->ipr_plen;
pfx->pfx_validlifetime = ipr->ipr_vltime;
pfx->pfx_preflifetime = ipr->ipr_pltime;
pfx->pfx_onlinkflg = ipr->ipr_raf_onlink;
pfx->pfx_autoconfflg = ipr->ipr_raf_auto;
pfx->pfx_origin = PREFIX_FROM_DYNAMIC;
pfx->pfx_rainfo = rai;
TAILQ_INSERT_TAIL(&rai->rai_prefix, pfx, pfx_next);
syslog(LOG_DEBUG, "<%s> new prefix %s/%d was added on %s",
__func__,
inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr, ntopbuf,
sizeof(ntopbuf)), ipr->ipr_plen, ifi->ifi_ifname);
rai->rai_pfxs++;
}
/*
* 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 *pfx)
{
struct rainfo *rai;
struct ifinfo *ifi;
char ntopbuf[INET6_ADDRSTRLEN];
rai = pfx->pfx_rainfo;
ifi = rai->rai_ifinfo;
TAILQ_REMOVE(&rai->rai_prefix, pfx, pfx_next);
syslog(LOG_DEBUG, "<%s> prefix %s/%d was deleted on %s",
__func__,
inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf,
sizeof(ntopbuf)), pfx->pfx_prefixlen, ifi->ifi_ifname);
if (pfx->pfx_timer)
rtadvd_remove_timer(pfx->pfx_timer);
free(pfx);
rai->rai_pfxs--;
}
void
invalidate_prefix(struct prefix *pfx)
{
struct timespec timo;
struct rainfo *rai;
struct ifinfo *ifi;
char ntopbuf[INET6_ADDRSTRLEN];
rai = pfx->pfx_rainfo;
ifi = rai->rai_ifinfo;
if (pfx->pfx_timer) { /* sanity check */
syslog(LOG_ERR,
"<%s> assumption failure: timer already exists",
__func__);
exit(1);
}
syslog(LOG_DEBUG, "<%s> prefix %s/%d was invalidated on %s, "
"will expire in %ld seconds", __func__,
inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf, sizeof(ntopbuf)),
pfx->pfx_prefixlen, ifi->ifi_ifname, (long)prefix_timo);
/* set the expiration timer */
pfx->pfx_timer = rtadvd_add_timer(prefix_timeout, NULL, pfx, NULL);
if (pfx->pfx_timer == NULL) {
syslog(LOG_ERR, "<%s> failed to add a timer for a prefix. "
"remove the prefix", __func__);
delete_prefix(pfx);
}
timo.tv_sec = prefix_timo;
timo.tv_nsec = 0;
rtadvd_set_timer(&timo, pfx->pfx_timer);
}
static struct rtadvd_timer *
prefix_timeout(void *arg)
{
delete_prefix((struct prefix *)arg);
return (NULL);
}
void
update_prefix(struct prefix *pfx)
{
struct rainfo *rai;
struct ifinfo *ifi;
char ntopbuf[INET6_ADDRSTRLEN];
rai = pfx->pfx_rainfo;
ifi = rai->rai_ifinfo;
if (pfx->pfx_timer == NULL) { /* sanity check */
syslog(LOG_ERR,
"<%s> assumption failure: timer does not exist",
__func__);
exit(1);
}
syslog(LOG_DEBUG, "<%s> prefix %s/%d was re-enabled on %s",
__func__, inet_ntop(AF_INET6, &pfx->pfx_prefix, ntopbuf,
sizeof(ntopbuf)), pfx->pfx_prefixlen, ifi->ifi_ifname);
/* stop the expiration timer */
rtadvd_remove_timer(pfx->pfx_timer);
pfx->pfx_timer = NULL;
}
/*
* 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)
{
#if 0
int s;
if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
syslog(LOG_ERR, "<%s> socket: %s", __func__,
strerror(errno));
exit(1);
}
if (ioctl(s, SIOCGIFPREFIX_IN6, (caddr_t)ipr) < 0) {
syslog(LOG_INFO, "<%s> ioctl:SIOCGIFPREFIX %s", __func__,
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) {
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", __func__,
inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr, ntopbuf,
sizeof(ntopbuf)), ipr->ipr_origin);
close(s);
return (1);
}
close(s);
return (0);
#else
ipr->ipr_vltime = DEF_ADVVALIDLIFETIME;
ipr->ipr_pltime = DEF_ADVPREFERREDLIFETIME;
ipr->ipr_raf_onlink = 1;
ipr->ipr_raf_auto = 1;
return (0);
#endif
}
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", __func__,
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);
}
void
make_packet(struct rainfo *rai)
{
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 nd_opt_route_info *ndopt_rti;
struct rtinfo *rti;
struct nd_opt_rdnss *ndopt_rdnss;
struct rdnss *rdn;
struct nd_opt_dnssl *ndopt_dnssl;
struct dnssl *dns;
size_t len;
struct prefix *pfx;
struct ifinfo *ifi;
ifi = rai->rai_ifinfo;
/* calculate total length */
packlen = sizeof(struct nd_router_advert);
if (rai->rai_advlinkopt) {
if ((lladdroptlen = lladdropt_length(&ifi->ifi_sdl)) == 0) {
syslog(LOG_INFO,
"<%s> link-layer address option has"
" null length on %s. Treat as not included.",
__func__, ifi->ifi_ifname);
rai->rai_advlinkopt = 0;
}
packlen += lladdroptlen;
}
if (rai->rai_pfxs)
packlen += sizeof(struct nd_opt_prefix_info) * rai->rai_pfxs;
if (rai->rai_linkmtu)
packlen += sizeof(struct nd_opt_mtu);
TAILQ_FOREACH(rti, &rai->rai_route, rti_next)
packlen += sizeof(struct nd_opt_route_info) +
((rti->rti_prefixlen + 0x3f) >> 6) * 8;
TAILQ_FOREACH(rdn, &rai->rai_rdnss, rd_next) {
struct rdnss_addr *rdna;
packlen += sizeof(struct nd_opt_rdnss);
TAILQ_FOREACH(rdna, &rdn->rd_list, ra_next)
packlen += sizeof(rdna->ra_dns);
}
TAILQ_FOREACH(dns, &rai->rai_dnssl, dn_next) {
struct dnssl_addr *dnsa;
packlen += sizeof(struct nd_opt_dnssl);
len = 0;
TAILQ_FOREACH(dnsa, &dns->dn_list, da_next)
len += dnsa->da_len;
/* A zero octet and 8 octet boundary */
len++;
len += (len % 8) ? 8 - len % 8 : 0;
packlen += len;
}
/* allocate memory for the packet */
if ((buf = malloc(packlen)) == NULL) {
syslog(LOG_ERR,
"<%s> can't get enough memory for an RA packet",
__func__);
exit(1);
}
memset(buf, 0, packlen);
if (rai->rai_ra_data) /* Free old data if any. */
free(rai->rai_ra_data);
rai->rai_ra_data = buf;
/* XXX: what if packlen > 576? */
rai->rai_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 = (uint8_t)(0xff & rai->rai_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 & rai->rai_rtpref;
ra->nd_ra_flags_reserved |=
rai->rai_managedflg ? ND_RA_FLAG_MANAGED : 0;
ra->nd_ra_flags_reserved |=
rai->rai_otherflg ? ND_RA_FLAG_OTHER : 0;
ra->nd_ra_router_lifetime = htons(rai->rai_lifetime);
ra->nd_ra_reachable = htonl(rai->rai_reachabletime);
ra->nd_ra_retransmit = htonl(rai->rai_retranstimer);
buf += sizeof(*ra);
if (rai->rai_advlinkopt) {
lladdropt_fill(&ifi->ifi_sdl, (struct nd_opt_hdr *)buf);
buf += lladdroptlen;
}
if (rai->rai_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 = htonl(rai->rai_linkmtu);
buf += sizeof(struct nd_opt_mtu);
}
TAILQ_FOREACH(pfx, &rai->rai_prefix, pfx_next) {
uint32_t vltime, pltime;
struct timespec now;
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->pfx_prefixlen;
ndopt_pi->nd_opt_pi_flags_reserved = 0;
if (pfx->pfx_onlinkflg)
ndopt_pi->nd_opt_pi_flags_reserved |=
ND_OPT_PI_FLAG_ONLINK;
if (pfx->pfx_autoconfflg)
ndopt_pi->nd_opt_pi_flags_reserved |=
ND_OPT_PI_FLAG_AUTO;
if (pfx->pfx_timer)
vltime = 0;
else {
if (pfx->pfx_vltimeexpire || pfx->pfx_pltimeexpire)
clock_gettime(CLOCK_MONOTONIC_FAST, &now);
if (pfx->pfx_vltimeexpire == 0)
vltime = pfx->pfx_validlifetime;
else
vltime = ((time_t)pfx->pfx_vltimeexpire > now.tv_sec) ?
pfx->pfx_vltimeexpire - now.tv_sec : 0;
}
if (pfx->pfx_timer)
pltime = 0;
else {
if (pfx->pfx_pltimeexpire == 0)
pltime = pfx->pfx_preflifetime;
else
pltime = ((time_t)pfx->pfx_pltimeexpire > now.tv_sec) ?
pfx->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->pfx_prefix;
buf += sizeof(struct nd_opt_prefix_info);
}
TAILQ_FOREACH(rti, &rai->rai_route, rti_next) {
uint8_t psize = (rti->rti_prefixlen + 0x3f) >> 6;
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->rti_prefixlen;
ndopt_rti->nd_opt_rti_flags = 0xff & rti->rti_rtpref;
ndopt_rti->nd_opt_rti_lifetime = htonl(rti->rti_ltime);
memcpy(ndopt_rti + 1, &rti->rti_prefix, psize * 8);
buf += sizeof(struct nd_opt_route_info) + psize * 8;
}
TAILQ_FOREACH(rdn, &rai->rai_rdnss, rd_next) {
struct rdnss_addr *rdna;
ndopt_rdnss = (struct nd_opt_rdnss *)buf;
ndopt_rdnss->nd_opt_rdnss_type = ND_OPT_RDNSS;
ndopt_rdnss->nd_opt_rdnss_len = 0;
ndopt_rdnss->nd_opt_rdnss_reserved = 0;
ndopt_rdnss->nd_opt_rdnss_lifetime = htonl(rdn->rd_ltime);
buf += sizeof(struct nd_opt_rdnss);
TAILQ_FOREACH(rdna, &rdn->rd_list, ra_next) {
memcpy(buf, &rdna->ra_dns, sizeof(rdna->ra_dns));
buf += sizeof(rdna->ra_dns);
}
/* Length field should be in 8 octets */
ndopt_rdnss->nd_opt_rdnss_len = (buf - (char *)ndopt_rdnss) / 8;
syslog(LOG_DEBUG, "<%s>: nd_opt_dnss_len = %d", __func__,
ndopt_rdnss->nd_opt_rdnss_len);
}
TAILQ_FOREACH(dns, &rai->rai_dnssl, dn_next) {
struct dnssl_addr *dnsa;
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(dns->dn_ltime);
buf += sizeof(*ndopt_dnssl);
TAILQ_FOREACH(dnsa, &dns->dn_list, da_next) {
memcpy(buf, dnsa->da_dom, dnsa->da_len);
buf += dnsa->da_len;
}
/* A zero octet after encoded DNS server list. */
*buf++ = '\0';
/* Padding to next 8 octets boundary */
len = buf - (char *)ndopt_dnssl;
len += (len % 8) ? 8 - len % 8 : 0;
buf = (char *)ndopt_dnssl + len;
/* Length field must be in 8 octets */
ndopt_dnssl->nd_opt_dnssl_len = len / 8;
syslog(LOG_DEBUG, "<%s>: nd_opt_dnssl_len = %d", __func__,
ndopt_dnssl->nd_opt_dnssl_len);
}
return;
}
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