0ef9f80522
OpenBSD does, since modulo is not power of 2. Obtained from: OpenBSD
1690 lines
43 KiB
C
1690 lines
43 KiB
C
/* $FreeBSD$ */
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/* $KAME: rtadvd.c,v 1.82 2003/08/05 12:34:23 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 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/socket.h>
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#include <sys/uio.h>
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#include <sys/time.h>
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#include <sys/queue.h>
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#include <net/if.h>
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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/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet/icmp6.h>
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#include <arpa/inet.h>
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#include <time.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <err.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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#include <syslog.h>
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#ifdef HAVE_POLL_H
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#include <poll.h>
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#endif
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#include "rtadvd.h"
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#include "rrenum.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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#include "dump.h"
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struct msghdr rcvmhdr;
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static u_char *rcvcmsgbuf;
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static size_t rcvcmsgbuflen;
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static u_char *sndcmsgbuf = NULL;
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static size_t sndcmsgbuflen;
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volatile sig_atomic_t do_dump;
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volatile sig_atomic_t do_die;
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struct msghdr sndmhdr;
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struct iovec rcviov[2];
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struct iovec sndiov[2];
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struct sockaddr_in6 rcvfrom;
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struct sockaddr_in6 sin6_allnodes = {sizeof(sin6_allnodes), AF_INET6};
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struct in6_addr in6a_site_allrouters;
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static char *dumpfilename = "/var/run/rtadvd.dump"; /* XXX: should be configurable */
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static char *pidfilename = "/var/run/rtadvd.pid"; /* should be configurable */
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static char *mcastif;
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int sock;
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int rtsock = -1;
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int accept_rr = 0;
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int dflag = 0, sflag = 0;
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u_char *conffile = NULL;
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struct rainfo *ralist = NULL;
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struct nd_optlist {
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struct nd_optlist *next;
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struct nd_opt_hdr *opt;
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};
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union nd_opts {
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struct nd_opt_hdr *nd_opt_array[9];
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struct {
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struct nd_opt_hdr *zero;
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struct nd_opt_hdr *src_lladdr;
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struct nd_opt_hdr *tgt_lladdr;
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struct nd_opt_prefix_info *pi;
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struct nd_opt_rd_hdr *rh;
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struct nd_opt_mtu *mtu;
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struct nd_optlist *list;
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} nd_opt_each;
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};
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#define nd_opts_src_lladdr nd_opt_each.src_lladdr
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#define nd_opts_tgt_lladdr nd_opt_each.tgt_lladdr
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#define nd_opts_pi nd_opt_each.pi
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#define nd_opts_rh nd_opt_each.rh
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#define nd_opts_mtu nd_opt_each.mtu
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#define nd_opts_list nd_opt_each.list
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#define NDOPT_FLAG_SRCLINKADDR 0x1
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#define NDOPT_FLAG_TGTLINKADDR 0x2
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#define NDOPT_FLAG_PREFIXINFO 0x4
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#define NDOPT_FLAG_RDHDR 0x8
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#define NDOPT_FLAG_MTU 0x10
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u_int32_t ndopt_flags[] = {
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0, NDOPT_FLAG_SRCLINKADDR, NDOPT_FLAG_TGTLINKADDR,
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NDOPT_FLAG_PREFIXINFO, NDOPT_FLAG_RDHDR, NDOPT_FLAG_MTU,
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};
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int main(int, char *[]);
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static void set_die(int);
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static void die(void);
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static void sock_open(void);
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static void rtsock_open(void);
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static void rtadvd_input(void);
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static void rs_input(int, struct nd_router_solicit *,
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struct in6_pktinfo *, struct sockaddr_in6 *);
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static void ra_input(int, struct nd_router_advert *,
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struct in6_pktinfo *, struct sockaddr_in6 *);
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static int prefix_check(struct nd_opt_prefix_info *, struct rainfo *,
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struct sockaddr_in6 *);
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static int nd6_options(struct nd_opt_hdr *, int,
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union nd_opts *, u_int32_t);
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static void free_ndopts(union nd_opts *);
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static void ra_output(struct rainfo *);
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static void rtmsg_input(void);
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static void rtadvd_set_dump_file(int);
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static void set_short_delay(struct rainfo *);
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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#ifdef HAVE_POLL_H
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struct pollfd set[2];
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#else
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fd_set *fdsetp, *selectfdp;
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int fdmasks;
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int maxfd = 0;
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#endif
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struct timeval *timeout;
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int i, ch;
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int fflag = 0, logopt;
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FILE *pidfp;
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pid_t pid;
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/* get command line options and arguments */
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while ((ch = getopt(argc, argv, "c:dDfM:Rs")) != -1) {
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switch (ch) {
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case 'c':
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conffile = optarg;
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break;
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case 'd':
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dflag = 1;
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break;
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case 'D':
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dflag = 2;
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break;
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case 'f':
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fflag = 1;
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break;
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case 'M':
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mcastif = optarg;
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break;
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case 'R':
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fprintf(stderr, "rtadvd: "
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"the -R option is currently ignored.\n");
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/* accept_rr = 1; */
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/* run anyway... */
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break;
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case 's':
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sflag = 1;
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break;
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}
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}
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argc -= optind;
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argv += optind;
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if (argc == 0) {
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fprintf(stderr,
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"usage: rtadvd [-dDfMRs] [-c conffile] "
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"interfaces...\n");
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exit(1);
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}
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logopt = LOG_NDELAY | LOG_PID;
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if (fflag)
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logopt |= LOG_PERROR;
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openlog("rtadvd", logopt, LOG_DAEMON);
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/* set log level */
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if (dflag == 0)
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(void)setlogmask(LOG_UPTO(LOG_ERR));
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if (dflag == 1)
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(void)setlogmask(LOG_UPTO(LOG_INFO));
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/* timer initialization */
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rtadvd_timer_init();
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#ifndef HAVE_ARC4RANDOM
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/* random value initialization */
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#ifdef __FreeBSD__
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srandomdev();
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#else
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srandom((u_long)time(NULL));
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#endif
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#endif
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/* get iflist block from kernel */
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init_iflist();
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while (argc--)
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getconfig(*argv++);
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if (inet_pton(AF_INET6, ALLNODES, &sin6_allnodes.sin6_addr) != 1) {
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fprintf(stderr, "fatal: inet_pton failed\n");
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exit(1);
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}
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if (!fflag)
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daemon(1, 0);
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sock_open();
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/* record the current PID */
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pid = getpid();
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if ((pidfp = fopen(pidfilename, "w")) == NULL) {
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syslog(LOG_ERR,
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"<%s> failed to open the pid log file, run anyway.",
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__func__);
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} else {
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fprintf(pidfp, "%d\n", pid);
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fclose(pidfp);
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}
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#ifdef HAVE_POLL_H
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set[0].fd = sock;
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set[0].events = POLLIN;
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if (sflag == 0) {
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rtsock_open();
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set[1].fd = rtsock;
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set[1].events = POLLIN;
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} else
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set[1].fd = -1;
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#else
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maxfd = sock;
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if (sflag == 0) {
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rtsock_open();
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if (rtsock > sock)
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maxfd = rtsock;
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} else
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rtsock = -1;
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fdmasks = howmany(maxfd + 1, NFDBITS) * sizeof(fd_mask);
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if ((fdsetp = malloc(fdmasks)) == NULL) {
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err(1, "malloc");
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/*NOTREACHED*/
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}
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if ((selectfdp = malloc(fdmasks)) == NULL) {
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err(1, "malloc");
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/*NOTREACHED*/
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}
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memset(fdsetp, 0, fdmasks);
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FD_SET(sock, fdsetp);
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if (rtsock >= 0)
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FD_SET(rtsock, fdsetp);
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#endif
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signal(SIGTERM, set_die);
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signal(SIGUSR1, rtadvd_set_dump_file);
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while (1) {
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#ifndef HAVE_POLL_H
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memcpy(selectfdp, fdsetp, fdmasks); /* reinitialize */
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#endif
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if (do_dump) { /* SIGUSR1 */
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do_dump = 0;
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rtadvd_dump_file(dumpfilename);
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}
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if (do_die) {
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die();
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/*NOTREACHED*/
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}
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/* timer expiration check and reset the timer */
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timeout = rtadvd_check_timer();
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if (timeout != NULL) {
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syslog(LOG_DEBUG,
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"<%s> set timer to %ld:%ld. waiting for "
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"inputs or timeout", __func__,
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(long int)timeout->tv_sec,
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(long int)timeout->tv_usec);
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} else {
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syslog(LOG_DEBUG,
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"<%s> there's no timer. waiting for inputs",
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__func__);
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}
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#ifdef HAVE_POLL_H
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if ((i = poll(set, 2, timeout ? (timeout->tv_sec * 1000 +
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timeout->tv_usec / 1000) : INFTIM)) < 0)
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#else
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if ((i = select(maxfd + 1, selectfdp, NULL, NULL,
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timeout)) < 0)
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#endif
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{
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/* EINTR would occur upon SIGUSR1 for status dump */
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if (errno != EINTR)
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syslog(LOG_ERR, "<%s> select: %s",
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__func__, strerror(errno));
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continue;
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}
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if (i == 0) /* timeout */
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continue;
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#ifdef HAVE_POLL_H
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if (rtsock != -1 && set[1].revents & POLLIN)
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#else
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if (rtsock != -1 && FD_ISSET(rtsock, selectfdp))
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#endif
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rtmsg_input();
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#ifdef HAVE_POLL_H
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if (set[0].revents & POLLIN)
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#else
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if (FD_ISSET(sock, selectfdp))
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#endif
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rtadvd_input();
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}
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exit(0); /* NOTREACHED */
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}
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static void
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rtadvd_set_dump_file(sig)
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int sig;
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{
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do_dump = 1;
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}
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static void
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set_die(sig)
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int sig;
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{
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do_die = 1;
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}
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static void
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die()
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{
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struct rainfo *ra;
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int i;
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const int retrans = MAX_FINAL_RTR_ADVERTISEMENTS;
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if (dflag > 1) {
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syslog(LOG_DEBUG, "<%s> cease to be an advertising router\n",
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__func__);
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}
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for (ra = ralist; ra; ra = ra->next) {
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ra->lifetime = 0;
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make_packet(ra);
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}
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for (i = 0; i < retrans; i++) {
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for (ra = ralist; ra; ra = ra->next)
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ra_output(ra);
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sleep(MIN_DELAY_BETWEEN_RAS);
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}
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exit(0);
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/*NOTREACHED*/
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}
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static void
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rtmsg_input()
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{
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int n, type, ifindex = 0, plen;
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size_t len;
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char msg[2048], *next, *lim;
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u_char ifname[IF_NAMESIZE];
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struct prefix *prefix;
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struct rainfo *rai;
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struct in6_addr *addr;
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char addrbuf[INET6_ADDRSTRLEN];
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int prefixchange = 0;
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n = read(rtsock, msg, sizeof(msg));
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if (dflag > 1) {
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syslog(LOG_DEBUG, "<%s> received a routing message "
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"(type = %d, len = %d)", __func__, rtmsg_type(msg), n);
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}
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if (n > rtmsg_len(msg)) {
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/*
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* This usually won't happen for messages received on
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* a routing socket.
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*/
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if (dflag > 1)
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syslog(LOG_DEBUG,
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"<%s> received data length is larger than "
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"1st routing message len. multiple messages? "
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"read %d bytes, but 1st msg len = %d",
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__func__, n, rtmsg_len(msg));
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#if 0
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/* adjust length */
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n = rtmsg_len(msg);
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#endif
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}
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lim = msg + n;
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for (next = msg; next < lim; next += len) {
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int oldifflags;
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next = get_next_msg(next, lim, 0, &len,
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RTADV_TYPE2BITMASK(RTM_ADD) |
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RTADV_TYPE2BITMASK(RTM_DELETE) |
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RTADV_TYPE2BITMASK(RTM_NEWADDR) |
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RTADV_TYPE2BITMASK(RTM_DELADDR) |
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RTADV_TYPE2BITMASK(RTM_IFINFO));
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if (len == 0)
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break;
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type = rtmsg_type(next);
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switch (type) {
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case RTM_ADD:
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case RTM_DELETE:
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ifindex = get_rtm_ifindex(next);
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break;
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case RTM_NEWADDR:
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case RTM_DELADDR:
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ifindex = get_ifam_ifindex(next);
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break;
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case RTM_IFINFO:
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ifindex = get_ifm_ifindex(next);
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break;
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default:
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/* should not reach here */
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if (dflag > 1) {
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syslog(LOG_DEBUG,
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"<%s:%d> unknown rtmsg %d on %s",
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__func__, __LINE__, type,
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if_indextoname(ifindex, ifname));
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}
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continue;
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}
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if ((rai = if_indextorainfo(ifindex)) == NULL) {
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if (dflag > 1) {
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syslog(LOG_DEBUG,
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"<%s> route changed on "
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"non advertising interface(%s)",
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__func__,
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if_indextoname(ifindex, ifname));
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}
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continue;
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}
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oldifflags = iflist[ifindex]->ifm_flags;
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switch (type) {
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case RTM_ADD:
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/* init ifflags because it may have changed */
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iflist[ifindex]->ifm_flags =
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if_getflags(ifindex, iflist[ifindex]->ifm_flags);
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if (sflag)
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break; /* we aren't interested in prefixes */
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addr = get_addr(msg);
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plen = get_prefixlen(msg);
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/* sanity check for plen */
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/* as RFC2373, prefixlen is at least 4 */
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if (plen < 4 || plen > 127) {
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syslog(LOG_INFO, "<%s> new interface route's"
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"plen %d is invalid for a prefix",
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__func__, plen);
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break;
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}
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prefix = find_prefix(rai, addr, plen);
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if (prefix) {
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if (prefix->timer) {
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/*
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* If the prefix has been invalidated,
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* make it available again.
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*/
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update_prefix(prefix);
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prefixchange = 1;
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} else if (dflag > 1) {
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syslog(LOG_DEBUG,
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"<%s> new prefix(%s/%d) "
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"added on %s, "
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"but it was already in list",
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__func__,
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inet_ntop(AF_INET6, addr,
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(char *)addrbuf, INET6_ADDRSTRLEN),
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plen, rai->ifname);
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}
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break;
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}
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make_prefix(rai, ifindex, addr, plen);
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prefixchange = 1;
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break;
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case RTM_DELETE:
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/* init ifflags because it may have changed */
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iflist[ifindex]->ifm_flags =
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if_getflags(ifindex, iflist[ifindex]->ifm_flags);
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|
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if (sflag)
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break;
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addr = get_addr(msg);
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plen = get_prefixlen(msg);
|
|
/* sanity check for plen */
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|
/* as RFC2373, prefixlen is at least 4 */
|
|
if (plen < 4 || plen > 127) {
|
|
syslog(LOG_INFO,
|
|
"<%s> deleted interface route's "
|
|
"plen %d is invalid for a prefix",
|
|
__func__, plen);
|
|
break;
|
|
}
|
|
prefix = find_prefix(rai, addr, plen);
|
|
if (prefix == NULL) {
|
|
if (dflag > 1) {
|
|
syslog(LOG_DEBUG,
|
|
"<%s> prefix(%s/%d) was "
|
|
"deleted on %s, "
|
|
"but it was not in list",
|
|
__func__,
|
|
inet_ntop(AF_INET6, addr,
|
|
(char *)addrbuf, INET6_ADDRSTRLEN),
|
|
plen, rai->ifname);
|
|
}
|
|
break;
|
|
}
|
|
invalidate_prefix(prefix);
|
|
prefixchange = 1;
|
|
break;
|
|
case RTM_NEWADDR:
|
|
case RTM_DELADDR:
|
|
/* init ifflags because it may have changed */
|
|
iflist[ifindex]->ifm_flags =
|
|
if_getflags(ifindex, iflist[ifindex]->ifm_flags);
|
|
break;
|
|
case RTM_IFINFO:
|
|
iflist[ifindex]->ifm_flags = get_ifm_flags(next);
|
|
break;
|
|
default:
|
|
/* should not reach here */
|
|
if (dflag > 1) {
|
|
syslog(LOG_DEBUG,
|
|
"<%s:%d> unknown rtmsg %d on %s",
|
|
__func__, __LINE__, type,
|
|
if_indextoname(ifindex, ifname));
|
|
}
|
|
return;
|
|
}
|
|
|
|
/* check if an interface flag is changed */
|
|
if ((oldifflags & IFF_UP) && /* UP to DOWN */
|
|
!(iflist[ifindex]->ifm_flags & IFF_UP)) {
|
|
syslog(LOG_INFO,
|
|
"<%s> interface %s becomes down. stop timer.",
|
|
__func__, rai->ifname);
|
|
rtadvd_remove_timer(&rai->timer);
|
|
} else if (!(oldifflags & IFF_UP) && /* DOWN to UP */
|
|
(iflist[ifindex]->ifm_flags & IFF_UP)) {
|
|
syslog(LOG_INFO,
|
|
"<%s> interface %s becomes up. restart timer.",
|
|
__func__, rai->ifname);
|
|
|
|
rai->initcounter = 0; /* reset the counter */
|
|
rai->waiting = 0; /* XXX */
|
|
rai->timer = rtadvd_add_timer(ra_timeout,
|
|
ra_timer_update, rai, rai);
|
|
ra_timer_update((void *)rai, &rai->timer->tm);
|
|
rtadvd_set_timer(&rai->timer->tm, rai->timer);
|
|
} else if (prefixchange &&
|
|
(iflist[ifindex]->ifm_flags & IFF_UP)) {
|
|
/*
|
|
* An advertised prefix has been added or invalidated.
|
|
* Will notice the change in a short delay.
|
|
*/
|
|
rai->initcounter = 0;
|
|
set_short_delay(rai);
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
void
|
|
rtadvd_input()
|
|
{
|
|
int i;
|
|
int *hlimp = NULL;
|
|
#ifdef OLDRAWSOCKET
|
|
struct ip6_hdr *ip;
|
|
#endif
|
|
struct icmp6_hdr *icp;
|
|
int ifindex = 0;
|
|
struct cmsghdr *cm;
|
|
struct in6_pktinfo *pi = NULL;
|
|
u_char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
|
|
struct in6_addr dst = in6addr_any;
|
|
|
|
/*
|
|
* Get message. We reset msg_controllen since the field could
|
|
* be modified if we had received a message before setting
|
|
* receive options.
|
|
*/
|
|
rcvmhdr.msg_controllen = rcvcmsgbuflen;
|
|
if ((i = recvmsg(sock, &rcvmhdr, 0)) < 0)
|
|
return;
|
|
|
|
/* extract optional information via Advanced API */
|
|
for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&rcvmhdr);
|
|
cm;
|
|
cm = (struct cmsghdr *)CMSG_NXTHDR(&rcvmhdr, cm)) {
|
|
if (cm->cmsg_level == IPPROTO_IPV6 &&
|
|
cm->cmsg_type == IPV6_PKTINFO &&
|
|
cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) {
|
|
pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
|
|
ifindex = pi->ipi6_ifindex;
|
|
dst = pi->ipi6_addr;
|
|
}
|
|
if (cm->cmsg_level == IPPROTO_IPV6 &&
|
|
cm->cmsg_type == IPV6_HOPLIMIT &&
|
|
cm->cmsg_len == CMSG_LEN(sizeof(int)))
|
|
hlimp = (int *)CMSG_DATA(cm);
|
|
}
|
|
if (ifindex == 0) {
|
|
syslog(LOG_ERR,
|
|
"<%s> failed to get receiving interface",
|
|
__func__);
|
|
return;
|
|
}
|
|
if (hlimp == NULL) {
|
|
syslog(LOG_ERR,
|
|
"<%s> failed to get receiving hop limit",
|
|
__func__);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If we happen to receive data on an interface which is now down,
|
|
* just discard the data.
|
|
*/
|
|
if ((iflist[pi->ipi6_ifindex]->ifm_flags & IFF_UP) == 0) {
|
|
syslog(LOG_INFO,
|
|
"<%s> received data on a disabled interface (%s)",
|
|
__func__,
|
|
if_indextoname(pi->ipi6_ifindex, ifnamebuf));
|
|
return;
|
|
}
|
|
|
|
#ifdef OLDRAWSOCKET
|
|
if (i < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr)) {
|
|
syslog(LOG_ERR,
|
|
"<%s> packet size(%d) is too short",
|
|
__func__, i);
|
|
return;
|
|
}
|
|
|
|
ip = (struct ip6_hdr *)rcvmhdr.msg_iov[0].iov_base;
|
|
icp = (struct icmp6_hdr *)(ip + 1); /* XXX: ext. hdr? */
|
|
#else
|
|
if (i < sizeof(struct icmp6_hdr)) {
|
|
syslog(LOG_ERR,
|
|
"<%s> packet size(%d) is too short",
|
|
__func__, i);
|
|
return;
|
|
}
|
|
|
|
icp = (struct icmp6_hdr *)rcvmhdr.msg_iov[0].iov_base;
|
|
#endif
|
|
|
|
switch (icp->icmp6_type) {
|
|
case ND_ROUTER_SOLICIT:
|
|
/*
|
|
* Message verification - RFC-2461 6.1.1
|
|
* XXX: these checks must be done in the kernel as well,
|
|
* but we can't completely rely on them.
|
|
*/
|
|
if (*hlimp != 255) {
|
|
syslog(LOG_NOTICE,
|
|
"<%s> RS with invalid hop limit(%d) "
|
|
"received from %s on %s",
|
|
__func__, *hlimp,
|
|
inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
|
|
INET6_ADDRSTRLEN),
|
|
if_indextoname(pi->ipi6_ifindex, ifnamebuf));
|
|
return;
|
|
}
|
|
if (icp->icmp6_code) {
|
|
syslog(LOG_NOTICE,
|
|
"<%s> RS with invalid ICMP6 code(%d) "
|
|
"received from %s on %s",
|
|
__func__, icp->icmp6_code,
|
|
inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
|
|
INET6_ADDRSTRLEN),
|
|
if_indextoname(pi->ipi6_ifindex, ifnamebuf));
|
|
return;
|
|
}
|
|
if (i < sizeof(struct nd_router_solicit)) {
|
|
syslog(LOG_NOTICE,
|
|
"<%s> RS from %s on %s does not have enough "
|
|
"length (len = %d)",
|
|
__func__,
|
|
inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
|
|
INET6_ADDRSTRLEN),
|
|
if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
|
|
return;
|
|
}
|
|
rs_input(i, (struct nd_router_solicit *)icp, pi, &rcvfrom);
|
|
break;
|
|
case ND_ROUTER_ADVERT:
|
|
/*
|
|
* Message verification - RFC-2461 6.1.2
|
|
* XXX: there's a same dilemma as above...
|
|
*/
|
|
if (*hlimp != 255) {
|
|
syslog(LOG_NOTICE,
|
|
"<%s> RA with invalid hop limit(%d) "
|
|
"received from %s on %s",
|
|
__func__, *hlimp,
|
|
inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
|
|
INET6_ADDRSTRLEN),
|
|
if_indextoname(pi->ipi6_ifindex, ifnamebuf));
|
|
return;
|
|
}
|
|
if (icp->icmp6_code) {
|
|
syslog(LOG_NOTICE,
|
|
"<%s> RA with invalid ICMP6 code(%d) "
|
|
"received from %s on %s",
|
|
__func__, icp->icmp6_code,
|
|
inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
|
|
INET6_ADDRSTRLEN),
|
|
if_indextoname(pi->ipi6_ifindex, ifnamebuf));
|
|
return;
|
|
}
|
|
if (i < sizeof(struct nd_router_advert)) {
|
|
syslog(LOG_NOTICE,
|
|
"<%s> RA from %s on %s does not have enough "
|
|
"length (len = %d)",
|
|
__func__,
|
|
inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
|
|
INET6_ADDRSTRLEN),
|
|
if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
|
|
return;
|
|
}
|
|
ra_input(i, (struct nd_router_advert *)icp, pi, &rcvfrom);
|
|
break;
|
|
case ICMP6_ROUTER_RENUMBERING:
|
|
if (accept_rr == 0) {
|
|
syslog(LOG_ERR, "<%s> received a router renumbering "
|
|
"message, but not allowed to be accepted",
|
|
__func__);
|
|
break;
|
|
}
|
|
rr_input(i, (struct icmp6_router_renum *)icp, pi, &rcvfrom,
|
|
&dst);
|
|
break;
|
|
default:
|
|
/*
|
|
* Note that this case is POSSIBLE, especially just
|
|
* after invocation of the daemon. This is because we
|
|
* could receive message after opening the socket and
|
|
* before setting ICMP6 type filter(see sock_open()).
|
|
*/
|
|
syslog(LOG_ERR, "<%s> invalid icmp type(%d)",
|
|
__func__, icp->icmp6_type);
|
|
return;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
static void
|
|
rs_input(int len, struct nd_router_solicit *rs,
|
|
struct in6_pktinfo *pi, struct sockaddr_in6 *from)
|
|
{
|
|
u_char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
|
|
union nd_opts ndopts;
|
|
struct rainfo *ra;
|
|
struct soliciter *sol;
|
|
|
|
syslog(LOG_DEBUG,
|
|
"<%s> RS received from %s on %s",
|
|
__func__,
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntopbuf, INET6_ADDRSTRLEN),
|
|
if_indextoname(pi->ipi6_ifindex, ifnamebuf));
|
|
|
|
/* ND option check */
|
|
memset(&ndopts, 0, sizeof(ndopts));
|
|
if (nd6_options((struct nd_opt_hdr *)(rs + 1),
|
|
len - sizeof(struct nd_router_solicit),
|
|
&ndopts, NDOPT_FLAG_SRCLINKADDR)) {
|
|
syslog(LOG_INFO,
|
|
"<%s> ND option check failed for an RS from %s on %s",
|
|
__func__,
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntopbuf, INET6_ADDRSTRLEN),
|
|
if_indextoname(pi->ipi6_ifindex, ifnamebuf));
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If the IP source address is the unspecified address, there
|
|
* must be no source link-layer address option in the message.
|
|
* (RFC-2461 6.1.1)
|
|
*/
|
|
if (IN6_IS_ADDR_UNSPECIFIED(&from->sin6_addr) &&
|
|
ndopts.nd_opts_src_lladdr) {
|
|
syslog(LOG_INFO,
|
|
"<%s> RS from unspecified src on %s has a link-layer"
|
|
" address option",
|
|
__func__,
|
|
if_indextoname(pi->ipi6_ifindex, ifnamebuf));
|
|
goto done;
|
|
}
|
|
|
|
ra = ralist;
|
|
while (ra != NULL) {
|
|
if (pi->ipi6_ifindex == ra->ifindex)
|
|
break;
|
|
ra = ra->next;
|
|
}
|
|
if (ra == NULL) {
|
|
syslog(LOG_INFO,
|
|
"<%s> RS received on non advertising interface(%s)",
|
|
__func__,
|
|
if_indextoname(pi->ipi6_ifindex, ifnamebuf));
|
|
goto done;
|
|
}
|
|
|
|
ra->rsinput++; /* increment statistics */
|
|
|
|
/*
|
|
* Decide whether to send RA according to the rate-limit
|
|
* consideration.
|
|
*/
|
|
|
|
/* record sockaddr waiting for RA, if possible */
|
|
sol = (struct soliciter *)malloc(sizeof(*sol));
|
|
if (sol) {
|
|
sol->addr = *from;
|
|
/* XXX RFC2553 need clarification on flowinfo */
|
|
sol->addr.sin6_flowinfo = 0;
|
|
sol->next = ra->soliciter;
|
|
ra->soliciter = sol;
|
|
}
|
|
|
|
/*
|
|
* If there is already a waiting RS packet, don't
|
|
* update the timer.
|
|
*/
|
|
if (ra->waiting++)
|
|
goto done;
|
|
|
|
set_short_delay(ra);
|
|
|
|
done:
|
|
free_ndopts(&ndopts);
|
|
return;
|
|
}
|
|
|
|
static void
|
|
set_short_delay(rai)
|
|
struct rainfo *rai;
|
|
{
|
|
long delay; /* must not be greater than 1000000 */
|
|
struct timeval interval, now, min_delay, tm_tmp, *rest;
|
|
|
|
/*
|
|
* Compute a random delay. If the computed value
|
|
* corresponds to a time later than the time the next
|
|
* multicast RA is scheduled to be sent, ignore the random
|
|
* delay and send the advertisement at the
|
|
* already-scheduled time. RFC-2461 6.2.6
|
|
*/
|
|
#ifdef HAVE_ARC4RANDOM
|
|
delay = arc4random_uniform(MAX_RA_DELAY_TIME);
|
|
#else
|
|
delay = random() % MAX_RA_DELAY_TIME;
|
|
#endif
|
|
interval.tv_sec = 0;
|
|
interval.tv_usec = delay;
|
|
rest = rtadvd_timer_rest(rai->timer);
|
|
if (TIMEVAL_LT(*rest, interval)) {
|
|
syslog(LOG_DEBUG, "<%s> random delay is larger than "
|
|
"the rest of the current timer", __func__);
|
|
interval = *rest;
|
|
}
|
|
|
|
/*
|
|
* If we sent a multicast Router Advertisement within
|
|
* the last MIN_DELAY_BETWEEN_RAS seconds, schedule
|
|
* the advertisement to be sent at a time corresponding to
|
|
* MIN_DELAY_BETWEEN_RAS plus the random value after the
|
|
* previous advertisement was sent.
|
|
*/
|
|
gettimeofday(&now, NULL);
|
|
TIMEVAL_SUB(&now, &rai->lastsent, &tm_tmp);
|
|
min_delay.tv_sec = MIN_DELAY_BETWEEN_RAS;
|
|
min_delay.tv_usec = 0;
|
|
if (TIMEVAL_LT(tm_tmp, min_delay)) {
|
|
TIMEVAL_SUB(&min_delay, &tm_tmp, &min_delay);
|
|
TIMEVAL_ADD(&min_delay, &interval, &interval);
|
|
}
|
|
rtadvd_set_timer(&interval, rai->timer);
|
|
}
|
|
|
|
static void
|
|
ra_input(int len, struct nd_router_advert *ra,
|
|
struct in6_pktinfo *pi, struct sockaddr_in6 *from)
|
|
{
|
|
struct rainfo *rai;
|
|
u_char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
|
|
union nd_opts ndopts;
|
|
char *on_off[] = {"OFF", "ON"};
|
|
u_int32_t reachabletime, retranstimer, mtu;
|
|
int inconsistent = 0;
|
|
|
|
syslog(LOG_DEBUG,
|
|
"<%s> RA received from %s on %s",
|
|
__func__,
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntopbuf, INET6_ADDRSTRLEN),
|
|
if_indextoname(pi->ipi6_ifindex, ifnamebuf));
|
|
|
|
/* ND option check */
|
|
memset(&ndopts, 0, sizeof(ndopts));
|
|
if (nd6_options((struct nd_opt_hdr *)(ra + 1),
|
|
len - sizeof(struct nd_router_advert),
|
|
&ndopts, NDOPT_FLAG_SRCLINKADDR |
|
|
NDOPT_FLAG_PREFIXINFO | NDOPT_FLAG_MTU)) {
|
|
syslog(LOG_INFO,
|
|
"<%s> ND option check failed for an RA from %s on %s",
|
|
__func__,
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntopbuf, INET6_ADDRSTRLEN),
|
|
if_indextoname(pi->ipi6_ifindex, ifnamebuf));
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* RA consistency check according to RFC-2461 6.2.7
|
|
*/
|
|
if ((rai = if_indextorainfo(pi->ipi6_ifindex)) == 0) {
|
|
syslog(LOG_INFO,
|
|
"<%s> received RA from %s on non-advertising"
|
|
" interface(%s)",
|
|
__func__,
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntopbuf, INET6_ADDRSTRLEN),
|
|
if_indextoname(pi->ipi6_ifindex, ifnamebuf));
|
|
goto done;
|
|
}
|
|
rai->rainput++; /* increment statistics */
|
|
|
|
/* Cur Hop Limit value */
|
|
if (ra->nd_ra_curhoplimit && rai->hoplimit &&
|
|
ra->nd_ra_curhoplimit != rai->hoplimit) {
|
|
syslog(LOG_INFO,
|
|
"<%s> CurHopLimit inconsistent on %s:"
|
|
" %d from %s, %d from us",
|
|
__func__,
|
|
rai->ifname,
|
|
ra->nd_ra_curhoplimit,
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntopbuf, INET6_ADDRSTRLEN),
|
|
rai->hoplimit);
|
|
inconsistent++;
|
|
}
|
|
/* M flag */
|
|
if ((ra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED) !=
|
|
rai->managedflg) {
|
|
syslog(LOG_INFO,
|
|
"<%s> M flag inconsistent on %s:"
|
|
" %s from %s, %s from us",
|
|
__func__,
|
|
rai->ifname,
|
|
on_off[!rai->managedflg],
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntopbuf, INET6_ADDRSTRLEN),
|
|
on_off[rai->managedflg]);
|
|
inconsistent++;
|
|
}
|
|
/* O flag */
|
|
if ((ra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER) !=
|
|
rai->otherflg) {
|
|
syslog(LOG_INFO,
|
|
"<%s> O flag inconsistent on %s:"
|
|
" %s from %s, %s from us",
|
|
__func__,
|
|
rai->ifname,
|
|
on_off[!rai->otherflg],
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntopbuf, INET6_ADDRSTRLEN),
|
|
on_off[rai->otherflg]);
|
|
inconsistent++;
|
|
}
|
|
/* Reachable Time */
|
|
reachabletime = ntohl(ra->nd_ra_reachable);
|
|
if (reachabletime && rai->reachabletime &&
|
|
reachabletime != rai->reachabletime) {
|
|
syslog(LOG_INFO,
|
|
"<%s> ReachableTime inconsistent on %s:"
|
|
" %d from %s, %d from us",
|
|
__func__,
|
|
rai->ifname,
|
|
reachabletime,
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntopbuf, INET6_ADDRSTRLEN),
|
|
rai->reachabletime);
|
|
inconsistent++;
|
|
}
|
|
/* Retrans Timer */
|
|
retranstimer = ntohl(ra->nd_ra_retransmit);
|
|
if (retranstimer && rai->retranstimer &&
|
|
retranstimer != rai->retranstimer) {
|
|
syslog(LOG_INFO,
|
|
"<%s> RetranceTimer inconsistent on %s:"
|
|
" %d from %s, %d from us",
|
|
__func__,
|
|
rai->ifname,
|
|
retranstimer,
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntopbuf, INET6_ADDRSTRLEN),
|
|
rai->retranstimer);
|
|
inconsistent++;
|
|
}
|
|
/* Values in the MTU options */
|
|
if (ndopts.nd_opts_mtu) {
|
|
mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
|
|
if (mtu && rai->linkmtu && mtu != rai->linkmtu) {
|
|
syslog(LOG_INFO,
|
|
"<%s> MTU option value inconsistent on %s:"
|
|
" %d from %s, %d from us",
|
|
__func__,
|
|
rai->ifname, mtu,
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntopbuf, INET6_ADDRSTRLEN),
|
|
rai->linkmtu);
|
|
inconsistent++;
|
|
}
|
|
}
|
|
/* Preferred and Valid Lifetimes for prefixes */
|
|
{
|
|
struct nd_optlist *optp = ndopts.nd_opts_list;
|
|
|
|
if (ndopts.nd_opts_pi) {
|
|
if (prefix_check(ndopts.nd_opts_pi, rai, from))
|
|
inconsistent++;
|
|
}
|
|
while (optp) {
|
|
if (prefix_check((struct nd_opt_prefix_info *)optp->opt,
|
|
rai, from))
|
|
inconsistent++;
|
|
optp = optp->next;
|
|
}
|
|
}
|
|
|
|
if (inconsistent)
|
|
rai->rainconsistent++;
|
|
|
|
done:
|
|
free_ndopts(&ndopts);
|
|
return;
|
|
}
|
|
|
|
/* return a non-zero value if the received prefix is inconsitent with ours */
|
|
static int
|
|
prefix_check(struct nd_opt_prefix_info *pinfo,
|
|
struct rainfo *rai, struct sockaddr_in6 *from)
|
|
{
|
|
u_int32_t preferred_time, valid_time;
|
|
struct prefix *pp;
|
|
int inconsistent = 0;
|
|
u_char ntopbuf[INET6_ADDRSTRLEN], prefixbuf[INET6_ADDRSTRLEN];
|
|
struct timeval now;
|
|
|
|
#if 0 /* impossible */
|
|
if (pinfo->nd_opt_pi_type != ND_OPT_PREFIX_INFORMATION)
|
|
return(0);
|
|
#endif
|
|
|
|
/*
|
|
* log if the adveritsed prefix has link-local scope(sanity check?)
|
|
*/
|
|
if (IN6_IS_ADDR_LINKLOCAL(&pinfo->nd_opt_pi_prefix)) {
|
|
syslog(LOG_INFO,
|
|
"<%s> link-local prefix %s/%d is advertised "
|
|
"from %s on %s",
|
|
__func__,
|
|
inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
|
|
prefixbuf, INET6_ADDRSTRLEN),
|
|
pinfo->nd_opt_pi_prefix_len,
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntopbuf, INET6_ADDRSTRLEN),
|
|
rai->ifname);
|
|
}
|
|
|
|
if ((pp = find_prefix(rai, &pinfo->nd_opt_pi_prefix,
|
|
pinfo->nd_opt_pi_prefix_len)) == NULL) {
|
|
syslog(LOG_INFO,
|
|
"<%s> prefix %s/%d from %s on %s is not in our list",
|
|
__func__,
|
|
inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
|
|
prefixbuf, INET6_ADDRSTRLEN),
|
|
pinfo->nd_opt_pi_prefix_len,
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntopbuf, INET6_ADDRSTRLEN),
|
|
rai->ifname);
|
|
return(0);
|
|
}
|
|
|
|
preferred_time = ntohl(pinfo->nd_opt_pi_preferred_time);
|
|
if (pp->pltimeexpire) {
|
|
/*
|
|
* The lifetime is decremented in real time, so we should
|
|
* compare the expiration time.
|
|
* (RFC 2461 Section 6.2.7.)
|
|
* XXX: can we really expect that all routers on the link
|
|
* have synchronized clocks?
|
|
*/
|
|
gettimeofday(&now, NULL);
|
|
preferred_time += now.tv_sec;
|
|
|
|
if (!pp->timer && rai->clockskew &&
|
|
abs(preferred_time - pp->pltimeexpire) > rai->clockskew) {
|
|
syslog(LOG_INFO,
|
|
"<%s> preferred lifetime for %s/%d"
|
|
" (decr. in real time) inconsistent on %s:"
|
|
" %d from %s, %ld from us",
|
|
__func__,
|
|
inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
|
|
prefixbuf, INET6_ADDRSTRLEN),
|
|
pinfo->nd_opt_pi_prefix_len,
|
|
rai->ifname, preferred_time,
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntopbuf, INET6_ADDRSTRLEN),
|
|
pp->pltimeexpire);
|
|
inconsistent++;
|
|
}
|
|
} else if (!pp->timer && preferred_time != pp->preflifetime) {
|
|
syslog(LOG_INFO,
|
|
"<%s> preferred lifetime for %s/%d"
|
|
" inconsistent on %s:"
|
|
" %d from %s, %d from us",
|
|
__func__,
|
|
inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
|
|
prefixbuf, INET6_ADDRSTRLEN),
|
|
pinfo->nd_opt_pi_prefix_len,
|
|
rai->ifname, preferred_time,
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntopbuf, INET6_ADDRSTRLEN),
|
|
pp->preflifetime);
|
|
}
|
|
|
|
valid_time = ntohl(pinfo->nd_opt_pi_valid_time);
|
|
if (pp->vltimeexpire) {
|
|
gettimeofday(&now, NULL);
|
|
valid_time += now.tv_sec;
|
|
|
|
if (!pp->timer && rai->clockskew &&
|
|
abs(valid_time - pp->vltimeexpire) > rai->clockskew) {
|
|
syslog(LOG_INFO,
|
|
"<%s> valid lifetime for %s/%d"
|
|
" (decr. in real time) inconsistent on %s:"
|
|
" %d from %s, %ld from us",
|
|
__func__,
|
|
inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
|
|
prefixbuf, INET6_ADDRSTRLEN),
|
|
pinfo->nd_opt_pi_prefix_len,
|
|
rai->ifname, preferred_time,
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntopbuf, INET6_ADDRSTRLEN),
|
|
pp->vltimeexpire);
|
|
inconsistent++;
|
|
}
|
|
} else if (!pp->timer && valid_time != pp->validlifetime) {
|
|
syslog(LOG_INFO,
|
|
"<%s> valid lifetime for %s/%d"
|
|
" inconsistent on %s:"
|
|
" %d from %s, %d from us",
|
|
__func__,
|
|
inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
|
|
prefixbuf, INET6_ADDRSTRLEN),
|
|
pinfo->nd_opt_pi_prefix_len,
|
|
rai->ifname, valid_time,
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntopbuf, INET6_ADDRSTRLEN),
|
|
pp->validlifetime);
|
|
inconsistent++;
|
|
}
|
|
|
|
return(inconsistent);
|
|
}
|
|
|
|
struct prefix *
|
|
find_prefix(struct rainfo *rai, struct in6_addr *prefix, int plen)
|
|
{
|
|
struct prefix *pp;
|
|
int bytelen, bitlen;
|
|
u_char bitmask;
|
|
|
|
for (pp = rai->prefix.next; pp != &rai->prefix; pp = pp->next) {
|
|
if (plen != pp->prefixlen)
|
|
continue;
|
|
bytelen = plen / 8;
|
|
bitlen = plen % 8;
|
|
bitmask = 0xff << (8 - bitlen);
|
|
if (memcmp((void *)prefix, (void *)&pp->prefix, bytelen))
|
|
continue;
|
|
if (bitlen == 0 ||
|
|
((prefix->s6_addr[bytelen] & bitmask) ==
|
|
(pp->prefix.s6_addr[bytelen] & bitmask))) {
|
|
return(pp);
|
|
}
|
|
}
|
|
|
|
return(NULL);
|
|
}
|
|
|
|
/* check if p0/plen0 matches p1/plen1; return 1 if matches, otherwise 0. */
|
|
int
|
|
prefix_match(struct in6_addr *p0, int plen0,
|
|
struct in6_addr *p1, int plen1)
|
|
{
|
|
int bytelen, bitlen;
|
|
u_char bitmask;
|
|
|
|
if (plen0 < plen1)
|
|
return(0);
|
|
bytelen = plen1 / 8;
|
|
bitlen = plen1 % 8;
|
|
bitmask = 0xff << (8 - bitlen);
|
|
if (memcmp((void *)p0, (void *)p1, bytelen))
|
|
return(0);
|
|
if (bitlen == 0 ||
|
|
((p0->s6_addr[bytelen] & bitmask) ==
|
|
(p1->s6_addr[bytelen] & bitmask))) {
|
|
return(1);
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
static int
|
|
nd6_options(struct nd_opt_hdr *hdr, int limit,
|
|
union nd_opts *ndopts, u_int32_t optflags)
|
|
{
|
|
int optlen = 0;
|
|
|
|
for (; limit > 0; limit -= optlen) {
|
|
if (limit < sizeof(struct nd_opt_hdr)) {
|
|
syslog(LOG_INFO, "<%s> short option header", __func__);
|
|
goto bad;
|
|
}
|
|
|
|
hdr = (struct nd_opt_hdr *)((caddr_t)hdr + optlen);
|
|
if (hdr->nd_opt_len == 0) {
|
|
syslog(LOG_INFO,
|
|
"<%s> bad ND option length(0) (type = %d)",
|
|
__func__, hdr->nd_opt_type);
|
|
goto bad;
|
|
}
|
|
optlen = hdr->nd_opt_len << 3;
|
|
if (optlen > limit) {
|
|
syslog(LOG_INFO, "<%s> short option", __func__);
|
|
goto bad;
|
|
}
|
|
|
|
if (hdr->nd_opt_type > ND_OPT_MTU) {
|
|
syslog(LOG_INFO, "<%s> unknown ND option(type %d)",
|
|
__func__, hdr->nd_opt_type);
|
|
continue;
|
|
}
|
|
|
|
if ((ndopt_flags[hdr->nd_opt_type] & optflags) == 0) {
|
|
syslog(LOG_INFO, "<%s> unexpected ND option(type %d)",
|
|
__func__, hdr->nd_opt_type);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Option length check. Do it here for all fixed-length
|
|
* options.
|
|
*/
|
|
if ((hdr->nd_opt_type == ND_OPT_MTU &&
|
|
(optlen != sizeof(struct nd_opt_mtu))) ||
|
|
((hdr->nd_opt_type == ND_OPT_PREFIX_INFORMATION &&
|
|
optlen != sizeof(struct nd_opt_prefix_info)))) {
|
|
syslog(LOG_INFO, "<%s> invalid option length",
|
|
__func__);
|
|
continue;
|
|
}
|
|
|
|
switch (hdr->nd_opt_type) {
|
|
case ND_OPT_TARGET_LINKADDR:
|
|
case ND_OPT_REDIRECTED_HEADER:
|
|
break; /* we don't care about these options */
|
|
case ND_OPT_SOURCE_LINKADDR:
|
|
case ND_OPT_MTU:
|
|
if (ndopts->nd_opt_array[hdr->nd_opt_type]) {
|
|
syslog(LOG_INFO,
|
|
"<%s> duplicated ND option (type = %d)",
|
|
__func__, hdr->nd_opt_type);
|
|
}
|
|
ndopts->nd_opt_array[hdr->nd_opt_type] = hdr;
|
|
break;
|
|
case ND_OPT_PREFIX_INFORMATION:
|
|
{
|
|
struct nd_optlist *pfxlist;
|
|
|
|
if (ndopts->nd_opts_pi == 0) {
|
|
ndopts->nd_opts_pi =
|
|
(struct nd_opt_prefix_info *)hdr;
|
|
continue;
|
|
}
|
|
if ((pfxlist = malloc(sizeof(*pfxlist))) == NULL) {
|
|
syslog(LOG_ERR, "<%s> can't allocate memory",
|
|
__func__);
|
|
goto bad;
|
|
}
|
|
pfxlist->next = ndopts->nd_opts_list;
|
|
pfxlist->opt = hdr;
|
|
ndopts->nd_opts_list = pfxlist;
|
|
|
|
break;
|
|
}
|
|
default: /* impossible */
|
|
break;
|
|
}
|
|
}
|
|
|
|
return(0);
|
|
|
|
bad:
|
|
free_ndopts(ndopts);
|
|
|
|
return(-1);
|
|
}
|
|
|
|
static void
|
|
free_ndopts(union nd_opts *ndopts)
|
|
{
|
|
struct nd_optlist *opt = ndopts->nd_opts_list, *next;
|
|
|
|
while (opt) {
|
|
next = opt->next;
|
|
free(opt);
|
|
opt = next;
|
|
}
|
|
}
|
|
|
|
void
|
|
sock_open()
|
|
{
|
|
struct icmp6_filter filt;
|
|
struct ipv6_mreq mreq;
|
|
struct rainfo *ra = ralist;
|
|
int on;
|
|
/* XXX: should be max MTU attached to the node */
|
|
static u_char answer[1500];
|
|
|
|
rcvcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
|
|
CMSG_SPACE(sizeof(int));
|
|
rcvcmsgbuf = (u_char *)malloc(rcvcmsgbuflen);
|
|
if (rcvcmsgbuf == NULL) {
|
|
syslog(LOG_ERR, "<%s> not enough core", __func__);
|
|
exit(1);
|
|
}
|
|
|
|
sndcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
|
|
CMSG_SPACE(sizeof(int));
|
|
sndcmsgbuf = (u_char *)malloc(sndcmsgbuflen);
|
|
if (sndcmsgbuf == NULL) {
|
|
syslog(LOG_ERR, "<%s> not enough core", __func__);
|
|
exit(1);
|
|
}
|
|
|
|
if ((sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
|
|
syslog(LOG_ERR, "<%s> socket: %s", __func__,
|
|
strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
/* specify to tell receiving interface */
|
|
on = 1;
|
|
#ifdef IPV6_RECVPKTINFO
|
|
if (setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
|
|
sizeof(on)) < 0) {
|
|
syslog(LOG_ERR, "<%s> IPV6_RECVPKTINFO: %s",
|
|
__func__, strerror(errno));
|
|
exit(1);
|
|
}
|
|
#else /* old adv. API */
|
|
if (setsockopt(sock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
|
|
sizeof(on)) < 0) {
|
|
syslog(LOG_ERR, "<%s> IPV6_PKTINFO: %s",
|
|
__func__, strerror(errno));
|
|
exit(1);
|
|
}
|
|
#endif
|
|
|
|
on = 1;
|
|
/* specify to tell value of hoplimit field of received IP6 hdr */
|
|
#ifdef IPV6_RECVHOPLIMIT
|
|
if (setsockopt(sock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
|
|
sizeof(on)) < 0) {
|
|
syslog(LOG_ERR, "<%s> IPV6_RECVHOPLIMIT: %s",
|
|
__func__, strerror(errno));
|
|
exit(1);
|
|
}
|
|
#else /* old adv. API */
|
|
if (setsockopt(sock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on,
|
|
sizeof(on)) < 0) {
|
|
syslog(LOG_ERR, "<%s> IPV6_HOPLIMIT: %s",
|
|
__func__, strerror(errno));
|
|
exit(1);
|
|
}
|
|
#endif
|
|
|
|
ICMP6_FILTER_SETBLOCKALL(&filt);
|
|
ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &filt);
|
|
ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt);
|
|
if (accept_rr)
|
|
ICMP6_FILTER_SETPASS(ICMP6_ROUTER_RENUMBERING, &filt);
|
|
if (setsockopt(sock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
|
|
sizeof(filt)) < 0) {
|
|
syslog(LOG_ERR, "<%s> IICMP6_FILTER: %s",
|
|
__func__, strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
/*
|
|
* join all routers multicast address on each advertising interface.
|
|
*/
|
|
if (inet_pton(AF_INET6, ALLROUTERS_LINK,
|
|
&mreq.ipv6mr_multiaddr.s6_addr)
|
|
!= 1) {
|
|
syslog(LOG_ERR, "<%s> inet_pton failed(library bug?)",
|
|
__func__);
|
|
exit(1);
|
|
}
|
|
while (ra) {
|
|
mreq.ipv6mr_interface = ra->ifindex;
|
|
if (setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
|
|
sizeof(mreq)) < 0) {
|
|
syslog(LOG_ERR, "<%s> IPV6_JOIN_GROUP(link) on %s: %s",
|
|
__func__, ra->ifname, strerror(errno));
|
|
exit(1);
|
|
}
|
|
ra = ra->next;
|
|
}
|
|
|
|
/*
|
|
* When attending router renumbering, join all-routers site-local
|
|
* multicast group.
|
|
*/
|
|
if (accept_rr) {
|
|
if (inet_pton(AF_INET6, ALLROUTERS_SITE,
|
|
&in6a_site_allrouters) != 1) {
|
|
syslog(LOG_ERR, "<%s> inet_pton failed(library bug?)",
|
|
__func__);
|
|
exit(1);
|
|
}
|
|
mreq.ipv6mr_multiaddr = in6a_site_allrouters;
|
|
if (mcastif) {
|
|
if ((mreq.ipv6mr_interface = if_nametoindex(mcastif))
|
|
== 0) {
|
|
syslog(LOG_ERR,
|
|
"<%s> invalid interface: %s",
|
|
__func__, mcastif);
|
|
exit(1);
|
|
}
|
|
} else
|
|
mreq.ipv6mr_interface = ralist->ifindex;
|
|
if (setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
|
|
&mreq, sizeof(mreq)) < 0) {
|
|
syslog(LOG_ERR,
|
|
"<%s> IPV6_JOIN_GROUP(site) on %s: %s",
|
|
__func__,
|
|
mcastif ? mcastif : ralist->ifname,
|
|
strerror(errno));
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
/* initialize msghdr for receiving packets */
|
|
rcviov[0].iov_base = (caddr_t)answer;
|
|
rcviov[0].iov_len = sizeof(answer);
|
|
rcvmhdr.msg_name = (caddr_t)&rcvfrom;
|
|
rcvmhdr.msg_namelen = sizeof(rcvfrom);
|
|
rcvmhdr.msg_iov = rcviov;
|
|
rcvmhdr.msg_iovlen = 1;
|
|
rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
|
|
rcvmhdr.msg_controllen = rcvcmsgbuflen;
|
|
|
|
/* initialize msghdr for sending packets */
|
|
sndmhdr.msg_namelen = sizeof(struct sockaddr_in6);
|
|
sndmhdr.msg_iov = sndiov;
|
|
sndmhdr.msg_iovlen = 1;
|
|
sndmhdr.msg_control = (caddr_t)sndcmsgbuf;
|
|
sndmhdr.msg_controllen = sndcmsgbuflen;
|
|
|
|
return;
|
|
}
|
|
|
|
/* open a routing socket to watch the routing table */
|
|
static void
|
|
rtsock_open()
|
|
{
|
|
if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
|
|
syslog(LOG_ERR,
|
|
"<%s> socket: %s", __func__, strerror(errno));
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
struct rainfo *
|
|
if_indextorainfo(int idx)
|
|
{
|
|
struct rainfo *rai = ralist;
|
|
|
|
for (rai = ralist; rai; rai = rai->next) {
|
|
if (rai->ifindex == idx)
|
|
return(rai);
|
|
}
|
|
|
|
return(NULL); /* search failed */
|
|
}
|
|
|
|
static void
|
|
ra_output(rainfo)
|
|
struct rainfo *rainfo;
|
|
{
|
|
int i;
|
|
struct cmsghdr *cm;
|
|
struct in6_pktinfo *pi;
|
|
struct soliciter *sol, *nextsol;
|
|
|
|
if ((iflist[rainfo->ifindex]->ifm_flags & IFF_UP) == 0) {
|
|
syslog(LOG_DEBUG, "<%s> %s is not up, skip sending RA",
|
|
__func__, rainfo->ifname);
|
|
return;
|
|
}
|
|
|
|
make_packet(rainfo); /* XXX: inefficient */
|
|
|
|
sndmhdr.msg_name = (caddr_t)&sin6_allnodes;
|
|
sndmhdr.msg_iov[0].iov_base = (caddr_t)rainfo->ra_data;
|
|
sndmhdr.msg_iov[0].iov_len = rainfo->ra_datalen;
|
|
|
|
cm = CMSG_FIRSTHDR(&sndmhdr);
|
|
/* specify the outgoing interface */
|
|
cm->cmsg_level = IPPROTO_IPV6;
|
|
cm->cmsg_type = IPV6_PKTINFO;
|
|
cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
|
|
pi = (struct in6_pktinfo *)CMSG_DATA(cm);
|
|
memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*XXX*/
|
|
pi->ipi6_ifindex = rainfo->ifindex;
|
|
|
|
/* specify the hop limit of the packet */
|
|
{
|
|
int hoplimit = 255;
|
|
|
|
cm = CMSG_NXTHDR(&sndmhdr, cm);
|
|
cm->cmsg_level = IPPROTO_IPV6;
|
|
cm->cmsg_type = IPV6_HOPLIMIT;
|
|
cm->cmsg_len = CMSG_LEN(sizeof(int));
|
|
memcpy(CMSG_DATA(cm), &hoplimit, sizeof(int));
|
|
}
|
|
|
|
syslog(LOG_DEBUG,
|
|
"<%s> send RA on %s, # of waitings = %d",
|
|
__func__, rainfo->ifname, rainfo->waiting);
|
|
|
|
i = sendmsg(sock, &sndmhdr, 0);
|
|
|
|
if (i < 0 || i != rainfo->ra_datalen) {
|
|
if (i < 0) {
|
|
syslog(LOG_ERR, "<%s> sendmsg on %s: %s",
|
|
__func__, rainfo->ifname,
|
|
strerror(errno));
|
|
}
|
|
}
|
|
/* update counter */
|
|
if (rainfo->initcounter < MAX_INITIAL_RTR_ADVERTISEMENTS)
|
|
rainfo->initcounter++;
|
|
rainfo->raoutput++;
|
|
|
|
/*
|
|
* unicast advertisements
|
|
* XXX commented out. reason: though spec does not forbit it, unicast
|
|
* advert does not really help
|
|
*/
|
|
for (sol = rainfo->soliciter; sol; sol = nextsol) {
|
|
nextsol = sol->next;
|
|
|
|
sol->next = NULL;
|
|
free(sol);
|
|
}
|
|
rainfo->soliciter = NULL;
|
|
|
|
/* update timestamp */
|
|
gettimeofday(&rainfo->lastsent, NULL);
|
|
|
|
/* reset waiting conter */
|
|
rainfo->waiting = 0;
|
|
}
|
|
|
|
/* process RA timer */
|
|
struct rtadvd_timer *
|
|
ra_timeout(void *data)
|
|
{
|
|
struct rainfo *rai = (struct rainfo *)data;
|
|
|
|
#ifdef notyet
|
|
/* if necessary, reconstruct the packet. */
|
|
#endif
|
|
|
|
syslog(LOG_DEBUG,
|
|
"<%s> RA timer on %s is expired",
|
|
__func__, rai->ifname);
|
|
|
|
ra_output(rai);
|
|
|
|
return(rai->timer);
|
|
}
|
|
|
|
/* update RA timer */
|
|
void
|
|
ra_timer_update(void *data, struct timeval *tm)
|
|
{
|
|
struct rainfo *rai = (struct rainfo *)data;
|
|
long interval;
|
|
|
|
/*
|
|
* Whenever a multicast advertisement is sent from an interface,
|
|
* the timer is reset to a uniformly-distributed random value
|
|
* between the interface's configured MinRtrAdvInterval and
|
|
* MaxRtrAdvInterval (RFC2461 6.2.4).
|
|
*/
|
|
interval = rai->mininterval;
|
|
#ifdef HAVE_ARC4RANDOM
|
|
interval += arc4random_uniform(rai->maxinterval - rai->mininterval);
|
|
#else
|
|
interval += random() % (rai->maxinterval - rai->mininterval);
|
|
#endif
|
|
|
|
/*
|
|
* For the first few advertisements (up to
|
|
* MAX_INITIAL_RTR_ADVERTISEMENTS), if the randomly chosen interval
|
|
* is greater than MAX_INITIAL_RTR_ADVERT_INTERVAL, the timer
|
|
* SHOULD be set to MAX_INITIAL_RTR_ADVERT_INTERVAL instead.
|
|
* (RFC-2461 6.2.4)
|
|
*/
|
|
if (rai->initcounter < MAX_INITIAL_RTR_ADVERTISEMENTS &&
|
|
interval > MAX_INITIAL_RTR_ADVERT_INTERVAL)
|
|
interval = MAX_INITIAL_RTR_ADVERT_INTERVAL;
|
|
|
|
tm->tv_sec = interval;
|
|
tm->tv_usec = 0;
|
|
|
|
syslog(LOG_DEBUG,
|
|
"<%s> RA timer on %s is set to %ld:%ld",
|
|
__func__, rai->ifname,
|
|
(long int)tm->tv_sec, (long int)tm->tv_usec);
|
|
|
|
return;
|
|
}
|