1086 lines
29 KiB
C
1086 lines
29 KiB
C
/* $FreeBSD$ */
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/* $KAME: config.c,v 1.37 2001/05/25 07:34:00 itojun Exp $ */
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/*
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* Copyright (C) 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#if defined(__FreeBSD__) && __FreeBSD__ >= 3
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#include <net/if_var.h>
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#endif /* __FreeBSD__ >= 3 */
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#include <net/route.h>
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#include <net/if_dl.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet/icmp6.h>
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#ifdef MIP6
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#include <netinet6/mip6.h>
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#endif
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <syslog.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#if defined(__NetBSD__) || defined(__OpenBSD__)
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#include <search.h>
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#endif
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#include <unistd.h>
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#include <ifaddrs.h>
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#include "rtadvd.h"
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#include "advcap.h"
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#include "timer.h"
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#include "if.h"
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#include "config.h"
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static time_t prefix_timo = (60 * 120); /* 2 hours.
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* XXX: should be configurable. */
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extern struct rainfo *ralist;
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static struct rtadvd_timer *prefix_timeout __P((void *));
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static void makeentry __P((char *, size_t, int, char *, int));
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static void get_prefix __P((struct rainfo *));
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static int getinet6sysctl __P((int));
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void
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getconfig(intface)
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char *intface;
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{
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int stat, pfxs, i;
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char tbuf[BUFSIZ];
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struct rainfo *tmp;
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long val;
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long long val64;
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char buf[BUFSIZ];
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char *bp = buf;
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char *addr;
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static int forwarding = -1;
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#define MUSTHAVE(var, cap) \
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do { \
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int t; \
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if ((t = agetnum(cap)) < 0) { \
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fprintf(stderr, "rtadvd: need %s for interface %s\n", \
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cap, intface); \
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exit(1); \
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} \
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var = t; \
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} while (0)
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#define MAYHAVE(var, cap, def) \
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do { \
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if ((var = agetnum(cap)) < 0) \
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var = def; \
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} while (0)
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if ((stat = agetent(tbuf, intface)) <= 0) {
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memset(tbuf, 0, sizeof(tbuf));
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syslog(LOG_INFO,
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"<%s> %s isn't defined in the configuration file"
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" or the configuration file doesn't exist."
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" Treat it as default",
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__FUNCTION__, intface);
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}
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tmp = (struct rainfo *)malloc(sizeof(*ralist));
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memset(tmp, 0, sizeof(*tmp));
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tmp->prefix.next = tmp->prefix.prev = &tmp->prefix;
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tmp->route.next = tmp->route.prev = &tmp->route;
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/* check if we are allowed to forward packets (if not determined) */
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if (forwarding < 0) {
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if ((forwarding = getinet6sysctl(IPV6CTL_FORWARDING)) < 0)
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exit(1);
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}
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/* get interface information */
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if (agetflag("nolladdr"))
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tmp->advlinkopt = 0;
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else
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tmp->advlinkopt = 1;
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if (tmp->advlinkopt) {
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if ((tmp->sdl = if_nametosdl(intface)) == NULL) {
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syslog(LOG_ERR,
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"<%s> can't get information of %s",
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__FUNCTION__, intface);
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exit(1);
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}
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tmp->ifindex = tmp->sdl->sdl_index;
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} else
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tmp->ifindex = if_nametoindex(intface);
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strncpy(tmp->ifname, intface, sizeof(tmp->ifname));
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if ((tmp->phymtu = if_getmtu(intface)) == 0) {
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tmp->phymtu = IPV6_MMTU;
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syslog(LOG_WARNING,
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"<%s> can't get interface mtu of %s. Treat as %d",
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__FUNCTION__, intface, IPV6_MMTU);
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}
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/*
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* set router configuration variables.
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*/
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MAYHAVE(val, "maxinterval", DEF_MAXRTRADVINTERVAL);
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if (val < MIN_MAXINTERVAL || val > MAX_MAXINTERVAL) {
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syslog(LOG_ERR,
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"<%s> maxinterval must be between %e and %u",
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__FUNCTION__, MIN_MAXINTERVAL, MAX_MAXINTERVAL);
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exit(1);
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}
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tmp->maxinterval = (u_int)val;
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MAYHAVE(val, "mininterval", tmp->maxinterval/3);
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if (val < MIN_MININTERVAL || val > (tmp->maxinterval * 3) / 4) {
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syslog(LOG_ERR,
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"<%s> mininterval must be between %e and %d",
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__FUNCTION__,
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MIN_MININTERVAL,
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(tmp->maxinterval * 3) / 4);
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exit(1);
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}
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tmp->mininterval = (u_int)val;
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MAYHAVE(val, "chlim", DEF_ADVCURHOPLIMIT);
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tmp->hoplimit = val & 0xff;
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MAYHAVE(val, "raflags", 0);
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tmp->managedflg = val & ND_RA_FLAG_MANAGED;
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tmp->otherflg = val & ND_RA_FLAG_OTHER;
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#ifdef MIP6
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if (mobileip6)
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tmp->haflg = val & ND_RA_FLAG_HA;
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#endif
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#ifndef ND_RA_FLAG_RTPREF_MASK
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#define ND_RA_FLAG_RTPREF_MASK 0x18 /* 00011000 */
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#define ND_RA_FLAG_RTPREF_RSV 0x10 /* 00010000 */
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#endif
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tmp->rtpref = val & ND_RA_FLAG_RTPREF_MASK;
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if (tmp->rtpref == ND_RA_FLAG_RTPREF_RSV) {
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syslog(LOG_ERR, "<%s> invalid router preference on %s",
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__FUNCTION__, intface);
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exit(1);
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}
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MAYHAVE(val, "rltime", tmp->maxinterval * 3);
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if (val && (val < tmp->maxinterval || val > MAXROUTERLIFETIME)) {
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syslog(LOG_ERR,
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"<%s> router lifetime on %s must be 0 or"
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" between %d and %d",
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__FUNCTION__, intface,
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tmp->maxinterval, MAXROUTERLIFETIME);
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exit(1);
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}
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/*
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* Basically, hosts MUST NOT send Router Advertisement messages at any
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* time (RFC 2461, Section 6.2.3). However, it would sometimes be
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* useful to allow hosts to advertise some parameters such as prefix
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* information and link MTU. Thus, we allow hosts to invoke rtadvd
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* only when router lifetime (on every advertising interface) is
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* explicitly set zero. (see also the above section)
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*/
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if (val && forwarding == 0) {
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syslog(LOG_WARNING,
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"<%s> non zero router lifetime is specified for %s, "
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"which must not be allowed for hosts.",
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__FUNCTION__, intface);
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exit(1);
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}
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tmp->lifetime = val & 0xffff;
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MAYHAVE(val, "rtime", DEF_ADVREACHABLETIME);
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if (val > MAXREACHABLETIME) {
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syslog(LOG_ERR,
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"<%s> reachable time must be no greater than %d",
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__FUNCTION__, MAXREACHABLETIME);
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exit(1);
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}
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tmp->reachabletime = (u_int32_t)val;
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MAYHAVE(val64, "retrans", DEF_ADVRETRANSTIMER);
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if (val64 < 0 || val64 > 0xffffffff) {
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syslog(LOG_ERR,
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"<%s> retrans time out of range", __FUNCTION__);
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exit(1);
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}
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tmp->retranstimer = (u_int32_t)val64;
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#ifndef MIP6
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if (agetstr("hapref", &bp) || agetstr("hatime", &bp)) {
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syslog(LOG_ERR,
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"<%s> mobile-ip6 configuration not supported",
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__FUNCTION__);
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exit(1);
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}
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#else
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if (!mobileip6) {
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if (agetstr("hapref", &bp) || agetstr("hatime", &bp)) {
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syslog(LOG_ERR,
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"<%s> mobile-ip6 configuration without "
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"proper command line option",
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__FUNCTION__);
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exit(1);
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}
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} else {
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tmp->hapref = 0;
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if ((val = agetnum("hapref")) >= 0)
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tmp->hapref = (int16_t)val;
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if (tmp->hapref != 0) {
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tmp->hatime = 0;
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MUSTHAVE(val, "hatime");
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tmp->hatime = (u_int16_t)val;
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if (tmp->hatime <= 0) {
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syslog(LOG_ERR,
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"<%s> home agent lifetime must be greater than 0",
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__FUNCTION__);
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exit(1);
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}
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}
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}
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#endif
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/* prefix information */
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/*
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* This is an implementation specific parameter to consinder
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* link propagation delays and poorly synchronized clocks when
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* checking consistency of advertised lifetimes.
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*/
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MAYHAVE(val, "clockskew", 0);
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tmp->clockskew = val;
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if ((pfxs = agetnum("addrs")) < 0) {
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/* auto configure prefix information */
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if (agetstr("addr", &bp) || agetstr("addr1", &bp)) {
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syslog(LOG_ERR,
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"<%s> conflicting prefix configuration for %s: "
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"automatic and manual config at the same time",
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__FUNCTION__, intface);
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exit(1);
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}
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get_prefix(tmp);
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}
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else {
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tmp->pfxs = pfxs;
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for (i = 0; i < pfxs; i++) {
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struct prefix *pfx;
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char entbuf[256];
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int added = (pfxs > 1) ? 1 : 0;
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/* allocate memory to store prefix information */
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if ((pfx = malloc(sizeof(struct prefix))) == NULL) {
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syslog(LOG_ERR,
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"<%s> can't allocate enough memory",
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__FUNCTION__);
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exit(1);
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}
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memset(pfx, 0, sizeof(*pfx));
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/* link into chain */
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insque(pfx, &tmp->prefix);
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pfx->rainfo = tmp;
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pfx->origin = PREFIX_FROM_CONFIG;
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makeentry(entbuf, sizeof(entbuf), i, "prefixlen",
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added);
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MAYHAVE(val, entbuf, 64);
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if (val < 0 || val > 128) {
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syslog(LOG_ERR,
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"<%s> prefixlen out of range",
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__FUNCTION__);
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exit(1);
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}
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pfx->prefixlen = (int)val;
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makeentry(entbuf, sizeof(entbuf), i, "pinfoflags",
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added);
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#ifdef MIP6
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if (mobileip6)
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{
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MAYHAVE(val, entbuf,
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(ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO|
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ND_OPT_PI_FLAG_ROUTER));
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} else
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#endif
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{
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MAYHAVE(val, entbuf,
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(ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO));
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}
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pfx->onlinkflg = val & ND_OPT_PI_FLAG_ONLINK;
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pfx->autoconfflg = val & ND_OPT_PI_FLAG_AUTO;
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#ifdef MIP6
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pfx->routeraddr = val & ND_OPT_PI_FLAG_ROUTER;
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#endif
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makeentry(entbuf, sizeof(entbuf), i, "vltime", added);
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MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME);
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if (val64 < 0 || val64 > 0xffffffff) {
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syslog(LOG_ERR,
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"<%s> vltime out of range",
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__FUNCTION__);
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exit(1);
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}
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pfx->validlifetime = (u_int32_t)val64;
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makeentry(entbuf, sizeof(entbuf), i, "vltimedecr",
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added);
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if (agetflag(entbuf)) {
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struct timeval now;
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gettimeofday(&now, 0);
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pfx->vltimeexpire =
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now.tv_sec + pfx->validlifetime;
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}
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makeentry(entbuf, sizeof(entbuf), i, "pltime", added);
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MAYHAVE(val64, entbuf, DEF_ADVPREFERREDLIFETIME);
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if (val64 < 0 || val64 > 0xffffffff) {
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syslog(LOG_ERR,
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"<%s> pltime out of range",
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__FUNCTION__);
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exit(1);
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}
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pfx->preflifetime = (u_int32_t)val64;
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makeentry(entbuf, sizeof(entbuf), i, "pltimedecr",
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added);
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if (agetflag(entbuf)) {
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struct timeval now;
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gettimeofday(&now, 0);
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pfx->pltimeexpire =
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now.tv_sec + pfx->preflifetime;
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}
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makeentry(entbuf, sizeof(entbuf), i, "addr", added);
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addr = (char *)agetstr(entbuf, &bp);
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if (addr == NULL) {
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syslog(LOG_ERR,
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"<%s> need %s as a prefix for "
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"interface %s",
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__FUNCTION__, entbuf, intface);
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exit(1);
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}
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if (inet_pton(AF_INET6, addr,
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&pfx->prefix) != 1) {
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syslog(LOG_ERR,
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"<%s> inet_pton failed for %s",
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__FUNCTION__, addr);
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exit(1);
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}
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if (IN6_IS_ADDR_MULTICAST(&pfx->prefix)) {
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syslog(LOG_ERR,
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"<%s> multicast prefix(%s) must "
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"not be advertised (IF=%s)",
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__FUNCTION__, addr, intface);
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exit(1);
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}
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if (IN6_IS_ADDR_LINKLOCAL(&pfx->prefix))
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syslog(LOG_NOTICE,
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"<%s> link-local prefix(%s) will be"
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" advertised on %s",
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__FUNCTION__, addr, intface);
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}
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}
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MAYHAVE(val, "mtu", 0);
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if (val < 0 || val > 0xffffffff) {
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syslog(LOG_ERR,
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"<%s> mtu out of range", __FUNCTION__);
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exit(1);
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}
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tmp->linkmtu = (u_int32_t)val;
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if (tmp->linkmtu == 0) {
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char *mtustr;
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if ((mtustr = (char *)agetstr("mtu", &bp)) &&
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strcmp(mtustr, "auto") == 0)
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tmp->linkmtu = tmp->phymtu;
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}
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else if (tmp->linkmtu < IPV6_MMTU || tmp->linkmtu > tmp->phymtu) {
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syslog(LOG_ERR,
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"<%s> advertised link mtu must be between"
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" least MTU and physical link MTU",
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__FUNCTION__);
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exit(1);
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}
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/* route information */
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MAYHAVE(val, "routes", 0);
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if (val < 0 || val > 0xffffffff) {
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syslog(LOG_ERR,
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"<%s> number of route information improper", __FUNCTION__);
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exit(1);
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}
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tmp->routes = val;
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for (i = 0; i < tmp->routes; i++) {
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struct rtinfo *rti;
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char entbuf[256];
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int added = (tmp->routes > 1) ? 1 : 0;
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/* allocate memory to store prefix information */
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if ((rti = malloc(sizeof(struct rtinfo))) == NULL) {
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syslog(LOG_ERR,
|
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"<%s> can't allocate enough memory",
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__FUNCTION__);
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exit(1);
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}
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memset(rti, 0, sizeof(*rti));
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/* link into chain */
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insque(rti, &tmp->route);
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makeentry(entbuf, sizeof(entbuf), i, "rtrplen", added);
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MAYHAVE(val, entbuf, 64);
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if (val < 0 || val > 128) {
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syslog(LOG_ERR,
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"<%s> prefixlen out of range",
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__FUNCTION__);
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exit(1);
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}
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rti->prefixlen = (int)val;
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makeentry(entbuf, sizeof(entbuf), i, "rtrflags", added);
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MAYHAVE(val, entbuf, 0);
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rti->rtpref = val & ND_RA_FLAG_RTPREF_MASK;
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if (rti->rtpref == ND_RA_FLAG_RTPREF_RSV) {
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syslog(LOG_ERR, "<%s> invalid router preference",
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__FUNCTION__);
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exit(1);
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}
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makeentry(entbuf, sizeof(entbuf), i, "rtrltime", added);
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/*
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|
* XXX: since default value of route lifetime is not defined in
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* draft-draves-route-selection-01.txt, I took the default
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* value of valid lifetime of prefix as its default.
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|
* It need be much considered.
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*/
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|
MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME);
|
|
if (val64 < 0 || val64 > 0xffffffff) {
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syslog(LOG_ERR,
|
|
"<%s> rtrltime out of range",
|
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__FUNCTION__);
|
|
exit(1);
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}
|
|
rti->ltime = (u_int32_t)val64;
|
|
|
|
makeentry(entbuf, sizeof(entbuf), i, "rtrprefix", added);
|
|
addr = (char *)agetstr(entbuf, &bp);
|
|
if (addr == NULL) {
|
|
syslog(LOG_ERR,
|
|
"<%s> need %s as a route for "
|
|
"interface %s",
|
|
__FUNCTION__, entbuf, intface);
|
|
exit(1);
|
|
}
|
|
if (inet_pton(AF_INET6, addr, &rti->prefix) != 1) {
|
|
syslog(LOG_ERR,
|
|
"<%s> inet_pton failed for %s",
|
|
__FUNCTION__, addr);
|
|
exit(1);
|
|
}
|
|
#if 0
|
|
/*
|
|
* XXX: currently there's no restriction in route information
|
|
* prefix according to draft-draves-route-selection-01.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 (IF=%s)",
|
|
__FUNCTION__, addr, intface);
|
|
exit(1);
|
|
}
|
|
if (IN6_IS_ADDR_LINKLOCAL(&rti->prefix)) {
|
|
syslog(LOG_NOTICE,
|
|
"<%s> link-local route (%s) must "
|
|
"not be advertised on %s",
|
|
__FUNCTION__, addr, intface);
|
|
exit(1);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
struct ifaddrs *ifap, *ifa;
|
|
struct prefix *pp;
|
|
struct in6_addr *a;
|
|
u_char *p, *ep, *m, *lim;
|
|
u_char ntopbuf[INET6_ADDRSTRLEN];
|
|
|
|
if (getifaddrs(&ifap) < 0) {
|
|
syslog(LOG_ERR,
|
|
"<%s> can't get interface addresses",
|
|
__FUNCTION__);
|
|
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 = (u_char *)&((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
|
|
lim = (u_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",
|
|
__FUNCTION__);
|
|
exit(1);
|
|
}
|
|
if (find_prefix(rai, a, plen)) {
|
|
/* ignore a duplicated prefix. */
|
|
continue;
|
|
}
|
|
|
|
/* 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, sweep bits outside of prefixlen */
|
|
pp->prefixlen = plen;
|
|
memcpy(&pp->prefix, a, sizeof(*a));
|
|
p = (u_char *)&pp->prefix;
|
|
ep = (u_char *)(&pp->prefix + 1);
|
|
while (m < lim)
|
|
*p++ &= *m++;
|
|
while (p < ep)
|
|
*p++ = 0x00;
|
|
|
|
if (!inet_ntop(AF_INET6, &pp->prefix, ntopbuf,
|
|
sizeof(ntopbuf))) {
|
|
syslog(LOG_ERR, "<%s> inet_ntop failed", __FUNCTION__);
|
|
exit(1);
|
|
}
|
|
syslog(LOG_DEBUG,
|
|
"<%s> add %s/%d to prefix list on %s",
|
|
__FUNCTION__, 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;
|
|
|
|
/* link into chain */
|
|
insque(pp, &rai->prefix);
|
|
|
|
/* counter increment */
|
|
rai->pfxs++;
|
|
}
|
|
|
|
freeifaddrs(ifap);
|
|
}
|
|
|
|
static void
|
|
makeentry(buf, len, id, string, add)
|
|
char *buf;
|
|
size_t len;
|
|
int id;
|
|
char *string;
|
|
int add;
|
|
{
|
|
char *ep = buf + len;
|
|
|
|
strcpy(buf, string);
|
|
if (add) {
|
|
char *cp;
|
|
|
|
cp = (char *)index(buf, '\0');
|
|
snprintf(cp, ep - cp, "%d", 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 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? */
|
|
}
|
|
memset(prefix, 0, sizeof(*prefix));
|
|
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;
|
|
prefix->origin = PREFIX_FROM_DYNAMIC;
|
|
|
|
insque(prefix, &rai->prefix);
|
|
prefix->rainfo = rai;
|
|
|
|
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 = NULL;
|
|
|
|
/* 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 prefix *prefix)
|
|
{
|
|
u_char ntopbuf[INET6_ADDRSTRLEN];
|
|
struct rainfo *rai = prefix->rainfo;
|
|
|
|
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);
|
|
if (prefix->timer)
|
|
rtadvd_remove_timer(&prefix->timer);
|
|
free(prefix);
|
|
rai->pfxs--;
|
|
}
|
|
|
|
void
|
|
invalidate_prefix(struct prefix *prefix)
|
|
{
|
|
u_char ntopbuf[INET6_ADDRSTRLEN];
|
|
struct timeval timo;
|
|
struct rainfo *rai = prefix->rainfo;
|
|
|
|
if (prefix->timer) { /* sanity check */
|
|
syslog(LOG_ERR,
|
|
"<%s> assumption failure: timer already exists",
|
|
__FUNCTION__);
|
|
exit(1);
|
|
}
|
|
|
|
syslog(LOG_DEBUG, "<%s> prefix %s/%d was invalidated on %s, "
|
|
"will expire in %ld seconds", __FUNCTION__,
|
|
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) {
|
|
syslog(LOG_ERR, "<%s> failed to add a timer for a prefix. "
|
|
"remove the prefix", __FUNCTION__);
|
|
delete_prefix(prefix);
|
|
}
|
|
timo.tv_sec = prefix_timo;
|
|
timo.tv_usec = 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)
|
|
{
|
|
u_char ntopbuf[INET6_ADDRSTRLEN];
|
|
struct rainfo *rai = prefix->rainfo;
|
|
|
|
if (prefix->timer == NULL) { /* sanity check */
|
|
syslog(LOG_ERR,
|
|
"<%s> assumption failure: timer does not exist",
|
|
__FUNCTION__);
|
|
exit(1);
|
|
}
|
|
|
|
syslog(LOG_DEBUG, "<%s> prefix %s/%d was re-enabled on %s",
|
|
__FUNCTION__, inet_ntop(AF_INET6, &prefix->prefix, ntopbuf,
|
|
INET6_ADDRSTRLEN), prefix->prefixlen, rai->ifname);
|
|
|
|
/* stop the expiration timer */
|
|
rtadvd_remove_timer(&prefix->timer);
|
|
}
|
|
|
|
/*
|
|
* 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", __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);
|
|
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", __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);
|
|
}
|
|
|
|
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;
|
|
#ifdef MIP6
|
|
struct nd_opt_advinterval *ndopt_advint;
|
|
struct nd_opt_homeagent_info *ndopt_hai;
|
|
#endif
|
|
struct nd_opt_route_info *ndopt_rti;
|
|
struct prefix *pfx;
|
|
struct rtinfo *rti;
|
|
|
|
/* 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);
|
|
#ifdef MIP6
|
|
if (mobileip6 && rainfo->maxinterval)
|
|
packlen += sizeof(struct nd_opt_advinterval);
|
|
if (mobileip6 && rainfo->hatime)
|
|
packlen += sizeof(struct nd_opt_homeagent_info);
|
|
#endif
|
|
#ifdef ND_OPT_ROUTE_INFO
|
|
for (rti = rainfo->route.next; rti != &rainfo->route; rti = rti->next)
|
|
packlen += sizeof(struct nd_opt_route_info) +
|
|
((rti->prefixlen + 0x3f) >> 6) * 8;
|
|
#endif
|
|
|
|
/* 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);
|
|
}
|
|
if (rainfo->ra_data) {
|
|
/* free the previous packet */
|
|
free(rainfo->ra_data);
|
|
rainfo->ra_data = NULL;
|
|
}
|
|
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; /* 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;
|
|
#ifdef MIP6
|
|
ra->nd_ra_flags_reserved |=
|
|
rainfo->haflg ? ND_RA_FLAG_HA : 0;
|
|
#endif
|
|
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 = htonl(rainfo->linkmtu);
|
|
buf += sizeof(struct nd_opt_mtu);
|
|
}
|
|
|
|
#ifdef MIP6
|
|
if (mobileip6 && rainfo->maxinterval) {
|
|
ndopt_advint = (struct nd_opt_advinterval *)buf;
|
|
ndopt_advint->nd_opt_adv_type = ND_OPT_ADVINTERVAL;
|
|
ndopt_advint->nd_opt_adv_len = 1;
|
|
ndopt_advint->nd_opt_adv_reserved = 0;
|
|
ndopt_advint->nd_opt_adv_interval = htonl(rainfo->maxinterval *
|
|
1000);
|
|
buf += sizeof(struct nd_opt_advinterval);
|
|
}
|
|
#endif
|
|
|
|
#ifdef MIP6
|
|
if (rainfo->hatime) {
|
|
ndopt_hai = (struct nd_opt_homeagent_info *)buf;
|
|
ndopt_hai->nd_opt_hai_type = ND_OPT_HOMEAGENT_INFO;
|
|
ndopt_hai->nd_opt_hai_len = 1;
|
|
ndopt_hai->nd_opt_hai_reserved = 0;
|
|
ndopt_hai->nd_opt_hai_preference = htons(rainfo->hapref);
|
|
ndopt_hai->nd_opt_hai_lifetime = htons(rainfo->hatime);
|
|
buf += sizeof(struct nd_opt_homeagent_info);
|
|
}
|
|
#endif
|
|
|
|
for (pfx = rainfo->prefix.next;
|
|
pfx != &rainfo->prefix; pfx = pfx->next) {
|
|
u_int32_t vltime, pltime;
|
|
struct timeval 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->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;
|
|
#ifdef MIP6
|
|
if (pfx->routeraddr)
|
|
ndopt_pi->nd_opt_pi_flags_reserved |=
|
|
ND_OPT_PI_FLAG_ROUTER;
|
|
#endif
|
|
if (pfx->timer)
|
|
vltime = 0;
|
|
else {
|
|
if (pfx->vltimeexpire || pfx->pltimeexpire)
|
|
gettimeofday(&now, NULL);
|
|
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);
|
|
}
|
|
|
|
#ifdef ND_OPT_ROUTE_INFO
|
|
for (rti = rainfo->route.next; rti != &rainfo->route; rti = rti->next) {
|
|
u_int8_t psize = (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->prefixlen;
|
|
ndopt_rti->nd_opt_rti_flags = 0xff & rti->rtpref;
|
|
ndopt_rti->nd_opt_rti_lifetime = rti->ltime;
|
|
memcpy(ndopt_rti + 1, &rti->prefix, psize * 8);
|
|
buf += sizeof(struct nd_opt_route_info) + psize * 8;
|
|
}
|
|
#endif
|
|
|
|
return;
|
|
}
|
|
|
|
static int
|
|
getinet6sysctl(int code)
|
|
{
|
|
int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
|
|
int value;
|
|
size_t size;
|
|
|
|
mib[3] = code;
|
|
size = sizeof(value);
|
|
if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0)
|
|
< 0) {
|
|
syslog(LOG_ERR, "<%s>: failed to get ip6 sysctl(%d): %s",
|
|
__FUNCTION__, code,
|
|
strerror(errno));
|
|
return(-1);
|
|
}
|
|
else
|
|
return(value);
|
|
}
|