* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.

/* $NetBSD: route6d.c,v 1.74 2019/07/11 03:49:52 msaitoh Exp $ */
/* $KAME: route6d.c,v 1.94 2002/10/26 20:08:55 itojun Exp $ */

/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: route6d.c,v 1.74 2019/07/11 03:49:52 msaitoh Exp $");
#endif

#include <stdbool.h>
#include <stdio.h>

#include <time.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <stdarg.h>
#include <syslog.h>
#include <stddef.h>
#include <errno.h>
#include <err.h>
#include <util.h>
#include <poll.h>

#include <sys/types.h>
#include <sys/param.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip6.h>
#include <netinet/udp.h>
#include <netdb.h>
#include <ifaddrs.h>

#include <arpa/inet.h>

#include "route6d.h"

#define MAXFILTER 40

#ifdef DEBUG
#define INIT_INTERVAL6 6
#else
#define INIT_INTERVAL6 10 /* Wait to submit a initial riprequest */
#endif

/* alignment constraint for routing socket */
#if defined(RT_ROUNDUP)
#define ROUNDUP(a) RT_ROUNDUP(a)
#else
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
#endif

/*
* Following two macros are highly depending on KAME Release
*/
#define IN6_LINKLOCAL_IFINDEX(addr) \
((addr).s6_addr[2] << 8 | (addr).s6_addr[3])

#define SET_IN6_LINKLOCAL_IFINDEX(addr, index) \
do { \
(addr).s6_addr[2] = ((index) >> 8) & 0xff; \
(addr).s6_addr[3] = (index) & 0xff; \
} while (0)

struct ifc { /* Configuration of an interface */
char *ifc_name; /* if name */
struct ifc *ifc_next;
int ifc_index; /* if index */
int ifc_mtu; /* if mtu */
int ifc_metric; /* if metric */
u_int ifc_flags; /* flags */
short ifc_cflags; /* IFC_XXX */
struct in6_addr ifc_mylladdr; /* my link-local address */
struct sockaddr_in6 ifc_ripsin; /* rip multicast address */
struct iff *ifc_filter; /* filter structure */
struct ifac *ifc_addr; /* list of AF_INET6 addresses */
int ifc_joined; /* joined to ff02::9 */
};

struct ifac { /* Address associated to an interface */
struct ifc *ifa_conf; /* back pointer */
struct ifac *ifa_next;
struct in6_addr ifa_addr; /* address */
struct in6_addr ifa_raddr; /* remote address, valid in p2p */
int ifa_plen; /* prefix length */
};

struct iff {
int iff_type;
struct in6_addr iff_addr;
int iff_plen;
struct iff *iff_next;
};

static struct ifc *ifc;
static int nifc; /* number of valid ifc's */
static struct ifc **index2ifc;
static int nindex2ifc;
static struct ifc *loopifcp = NULL; /* pointing to loopback */
static struct pollfd set[2];
static int rtsock; /* the routing socket */
static int ripsock; /* socket to send/receive RIP datagram */

static struct rip6 *ripbuf; /* packet buffer for sending */

/*
* Maintain the routes in a linked list. When the number of the routes
* grows, somebody would like to introduce a hash based or a radix tree
* based structure. I believe the number of routes handled by RIP is
* limited and I don't have to manage a complex data structure, however.
*
* One of the major drawbacks of the linear linked list is the difficulty
* of representing the relationship between a couple of routes. This may
* be a significant problem when we have to support route aggregation with
* suppressing the specifices covered by the aggregate.
*/

struct riprt {
struct riprt *rrt_next; /* next destination */
struct riprt *rrt_same; /* same destination - future use */
struct netinfo6 rrt_info; /* network info */
struct in6_addr rrt_gw; /* gateway */
u_long rrt_flags; /* kernel routing table flags */
u_long rrt_rflags; /* route6d routing table flags */
time_t rrt_t; /* when the route validated */
int rrt_index; /* ifindex from which this route got */
};

static struct riprt *riprt = 0;

static int dflag = 0; /* debug flag */
static int qflag = 0; /* quiet flag */
static int nflag = 0; /* don't update kernel routing table */
static int aflag = 0; /* age out even the statically defined routes */
static int hflag = 0; /* don't split horizon */
static int lflag = 0; /* exchange site local routes */
static int sflag = 0; /* announce static routes w/ split horizon */
static int Sflag = 0; /* announce static routes to every interface */
static unsigned long routetag = 0; /* route tag attached on originating case */

static char *filter[MAXFILTER];
static int filtertype[MAXFILTER];
static int nfilter = 0;

static pid_t pid;

static struct sockaddr_storage ripsin;

static int interval = 1;
static time_t nextalarm = 0;

static FILE *rtlog = NULL;

static int logopened = 0;

static int seq = 0;

static volatile sig_atomic_t seenalrm;
static volatile sig_atomic_t seenquit;
static volatile sig_atomic_t seenusr1;

#define RRTF_AGGREGATE 0x08000000
#define RRTF_NOADVERTISE 0x10000000
#define RRTF_NH_NOT_LLADDR 0x20000000
#define RRTF_SENDANYWAY 0x40000000
#define RRTF_CHANGED 0x80000000

static void sighandler(int);
static void ripalarm(void);
static void riprecv(void);
static void ripsend(struct ifc *, struct sockaddr_in6 *, int);
static int out_filter(struct riprt *, struct ifc *);
static void init(void);
static void ifconfig(void);
static void ifconfig1(const char *, const struct sockaddr *, struct ifc *, int);
static void rtrecv(void);
static int rt_del(const struct sockaddr_in6 *, const struct sockaddr_in6 *,
const struct sockaddr_in6 *);
static int rt_deladdr(struct ifc *, const struct sockaddr_in6 *,
const struct sockaddr_in6 *);
static void filterconfig(void);
static int getifmtu(int);
static const char *
rttypes(struct rt_msghdr *);
static const char *
rtflags(struct rt_msghdr *);
static const char *
ifflags(int);
static int ifrt(struct ifc *, int);
static void ifrt_p2p(struct ifc *, int);
static void applyplen(struct in6_addr *, int);
static void ifrtdump(int);
static void ifdump(int);
static void ifdump0(FILE *, const struct ifc *);
static void rtdump(int);
static void rt_entry(struct rt_msghdr *, int);
static void rtdexit(void) __dead;
static void riprequest(struct ifc *, struct netinfo6 *, int,
struct sockaddr_in6 *);
static void ripflush(struct ifc *, struct sockaddr_in6 *);
static void sendrequest(struct ifc *);
static int sin6mask2len(const struct sockaddr_in6 *);
static int mask2len(const struct in6_addr *, int);
static int sendpacket(struct sockaddr_in6 *, int);
static int addroute(struct riprt *, const struct in6_addr *, struct ifc *);
static int delroute(struct netinfo6 *, struct in6_addr *);
static void krtread(int);
static int tobeadv(struct riprt *, struct ifc *);
static char * xstrdup(char *);
static char * hms(void);
static const char *
inet6_n2p(const struct in6_addr *);
static struct ifac *
ifa_match(const struct ifc *, const struct in6_addr *, int);
static struct in6_addr *
plen2mask(int);
static struct riprt *
rtsearch(struct netinfo6 *, struct riprt **);
static int ripinterval(int);
static void fatal(const char *, ...) __printflike(1, 2) __dead;
static void trace(int, const char *, ...) __printflike(2, 3);
static void tracet(int, const char *, ...) __printflike(2, 3);
static struct ifc *
ifc_find(char *);
static struct iff *
iff_find(struct ifc *, int);
static void setindex2ifc(int, struct ifc *);

#define MALLOC(type) (malloc(sizeof(type)))

int
main(int argc, char **argv)
{
int ch;
int error = 0;
struct ifc *ifcp;
sigset_t mask, omask;
char *progname;
char *ep;

progname = strrchr(*argv, '/');
if (progname)
progname++;
else
progname = *argv;

pid = getpid();
while ((ch = getopt(argc, argv, "A:N:O:R:T:L:t:adDhlnqsS")) != -1) {
switch (ch) {
case 'A':
case 'N':
case 'O':
case 'T':
case 'L':
if (nfilter >= MAXFILTER) {
fatal("Exceeds MAXFILTER");
}
filtertype[nfilter] = ch;
filter[nfilter++] = xstrdup(optarg);
break;
case 't':
ep = NULL;
routetag = strtoul(optarg, &ep, 0);
if (!ep || *ep != '\0' || (routetag & ~0xffff) != 0) {
fatal("invalid route tag");
}
break;
case 'R':
if ((rtlog = fopen(optarg, "w")) == NULL) {
fatal("Can not write to routelog");
}
break;
#define FLAG(c, flag, n) case c: do { flag = n; break; } while(0)
FLAG('a', aflag, 1); break;
FLAG('d', dflag, 1); break;
FLAG('D', dflag, 2); break;
FLAG('h', hflag, 1); break;
FLAG('l', lflag, 1); break;
FLAG('n', nflag, 1); break;
FLAG('q', qflag, 1); break;
FLAG('s', sflag, 1); break;
FLAG('S', Sflag, 1); break;
#undef FLAG
default:
fatal("Invalid option specified, terminating");
}
}
argc -= optind;
argv += optind;
if (argc > 0) {
fatal("bogus extra arguments");
}

if (geteuid()) {
nflag = 1;
fprintf(stderr, "No kernel update is allowed\n");
}

if (dflag == 0) {
if (daemon(0, 0) < 0) {
fatal("daemon");
}
}

openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON);
logopened++;

if ((ripbuf = malloc(RIP6_MAXMTU)) == NULL)
fatal("malloc");
memset(ripbuf, 0, RIP6_MAXMTU);
ripbuf->rip6_cmd = RIP6_RESPONSE;
ripbuf->rip6_vers = RIP6_VERSION;
ripbuf->rip6_res1[0] = 0;
ripbuf->rip6_res1[1] = 0;

init();
ifconfig();
for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
if (ifcp->ifc_index < 0) {
fprintf(stderr,
"No ifindex found at %s (no link-local address?)\n",
ifcp->ifc_name);
error++;
}
}
if (error)
exit(1);
if (loopifcp == NULL) {
fatal("No loopback found");
}
for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
ifrt(ifcp, 0);
filterconfig();
krtread(0);
if (dflag)
ifrtdump(0);

pidfile(NULL);

if ((ripbuf = malloc(RIP6_MAXMTU)) == NULL) {
fatal("malloc");
}
memset(ripbuf, 0, RIP6_MAXMTU);
ripbuf->rip6_cmd = RIP6_RESPONSE;
ripbuf->rip6_vers = RIP6_VERSION;
ripbuf->rip6_res1[0] = 0;
ripbuf->rip6_res1[1] = 0;

if (signal(SIGALRM, sighandler) == SIG_ERR ||
signal(SIGQUIT, sighandler) == SIG_ERR ||
signal(SIGTERM, sighandler) == SIG_ERR ||
signal(SIGUSR1, sighandler) == SIG_ERR ||
signal(SIGHUP, sighandler) == SIG_ERR ||
signal(SIGINT, sighandler) == SIG_ERR) {
fatal("signal");
}
/*
* To avoid rip packet congestion (not on a cable but in this
* process), wait for a moment to send the first RIP6_RESPONSE
* packets.
*/
alarm(ripinterval(INIT_INTERVAL6));

for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
if (iff_find(ifcp, 'N'))
continue;
if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
sendrequest(ifcp);
}

syslog(LOG_INFO, "**** Started ****");
sigemptyset(&mask);
sigaddset(&mask, SIGALRM);
while (1) {
if (seenalrm) {
ripalarm();
seenalrm = 0;
continue;
}
if (seenquit) {
rtdexit();
seenquit = 0;
continue;
}
if (seenusr1) {
ifrtdump(SIGUSR1);
seenusr1 = 0;
continue;
}

switch (poll(set, 2, INFTIM))
{
case -1:
if (errno != EINTR) {
fatal("poll");
}
continue;
case 0:
continue;
default:
if (set[0].revents & POLLIN)
{
sigprocmask(SIG_BLOCK, &mask, &omask);
riprecv();
sigprocmask(SIG_SETMASK, &omask, NULL);
}
if (set[1].revents & POLLIN)
{
sigprocmask(SIG_BLOCK, &mask, &omask);
rtrecv();
sigprocmask(SIG_SETMASK, &omask, NULL);
}
}
}
}

static void
sighandler(int signo)
{

switch (signo) {
case SIGALRM:
seenalrm++;
break;
case SIGQUIT:
case SIGTERM:
seenquit++;
break;
case SIGUSR1:
case SIGHUP:
case SIGINT:
seenusr1++;
break;
}
}

/*
* gracefully exits after resetting sockopts.
*/
/* ARGSUSED */
static void
rtdexit(void)
{
struct riprt *rrt;

alarm(0);
for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
if (rrt->rrt_rflags & RRTF_AGGREGATE) {
delroute(&rrt->rrt_info, &rrt->rrt_gw);
}
}
close(ripsock);
close(rtsock);
syslog(LOG_INFO, "**** Terminated ****");
closelog();
exit(1);
}

/*
* Called periodically:
* 1. age out the learned route. remove it if necessary.
* 2. submit RIP6_RESPONSE packets.
* Invoked in every SUPPLY_INTERVAL6 (30) seconds. I believe we don't have
* to invoke this function in every 1 or 5 or 10 seconds only to age the
* routes more precisely.
*/
/* ARGSUSED */
static void
ripalarm(void)
{
struct ifc *ifcp;
struct riprt *rrt, *rrt_prev, *rrt_next;
time_t t_lifetime, t_holddown;

/* age the RIP routes */
rrt_prev = 0;
t_lifetime = time(NULL) - RIP_LIFETIME;
t_holddown = t_lifetime - RIP_HOLDDOWN;
for (rrt = riprt; rrt; rrt = rrt_next) {
rrt_next = rrt->rrt_next;

if (rrt->rrt_t == 0) {
rrt_prev = rrt;
continue;
}
if (rrt->rrt_t < t_holddown) {
if (rrt_prev) {
rrt_prev->rrt_next = rrt->rrt_next;
} else {
riprt = rrt->rrt_next;
}
delroute(&rrt->rrt_info, &rrt->rrt_gw);
free(rrt);
continue;
}
if (rrt->rrt_t < t_lifetime)
rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
rrt_prev = rrt;
}
/* Supply updates */
for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
ripsend(ifcp, &ifcp->ifc_ripsin, 0);
}
alarm(ripinterval(SUPPLY_INTERVAL6));
}

static void
init(void)
{
int i, error;
const int int0 = 0, int1 = 1, int255 = 255;
struct addrinfo hints, *res;
char port[NI_MAXSERV];

ifc = NULL;
nifc = 0;
nindex2ifc = 0; /*initial guess*/
index2ifc = NULL;
snprintf(port, sizeof(port), "%u", RIP6_PORT);

memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_INET6;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags = AI_PASSIVE;
error = getaddrinfo(NULL, port, &hints, &res);
if (error) {
fatal("%s", gai_strerror(error));
}
if (res->ai_next) {
fatal(":: resolved to multiple address");
}

ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (ripsock < 0) {
fatal("rip socket");
}
if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_V6ONLY,
&int1, sizeof(int1)) < 0) {
fatal("rip IPV6_V6ONLY");
}
if (bind(ripsock, res->ai_addr, res->ai_addrlen) < 0) {
fatal("rip bind");
}
if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
&int255, sizeof(int255)) < 0) {
fatal("rip IPV6_MULTICAST_HOPS");
}
if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
&int0, sizeof(int0)) < 0) {
fatal("rip IPV6_MULTICAST_LOOP");
}

i = 1;
if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &i,
sizeof(i)) < 0) {
fatal("rip IPV6_RECVPKTINFO");
}

freeaddrinfo(res);
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_INET6;
hints.ai_socktype = SOCK_DGRAM;
error = getaddrinfo(RIP6_DEST, port, &hints, &res);
if (error) {
fatal("%s", gai_strerror(error));
}
if (res->ai_next) {
fatal("%s resolved to multiple address", RIP6_DEST);
}
memcpy(&ripsin, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);

set[0].fd = ripsock;
set[0].events = POLLIN;

if (nflag == 0) {
if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
fatal("route socket");
}
set[1].fd = rtsock;
set[1].events = POLLIN;
} else {
set[1].fd = -1;
}
}

#define RIPSIZE(n) \
(sizeof(struct rip6) + ((n)-1) * sizeof(struct netinfo6))

/*
* ripflush flushes the rip datagram stored in the rip buffer
*/
static int nrt;
static struct netinfo6 *nip;

static void
ripflush(struct ifc *ifcp, struct sockaddr_in6 *sin6)
{
int i;
int error;

if (ifcp)
tracet(1, "Send(%s): info(%d) to %s.%d\n",
ifcp->ifc_name, nrt,
inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port));
else
tracet(1, "Send: info(%d) to %s.%d\n",
nrt, inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port));
if (dflag >= 2) {
nip = ripbuf->rip6_nets;
for (i = 0; i < nrt; i++, nip++) {
if (nip->rip6_metric == NEXTHOP_METRIC) {
if (IN6_IS_ADDR_UNSPECIFIED(&nip->rip6_dest))
trace(2, " NextHop reset");
else {
trace(2, " NextHop %s",
inet6_n2p(&nip->rip6_dest));
}
} else {
trace(2, " %s/%d[%d]",
inet6_n2p(&nip->rip6_dest),
nip->rip6_plen, nip->rip6_metric);
}
if (nip->rip6_tag) {
trace(2, " tag=0x%04x",
ntohs(nip->rip6_tag) & 0xffff);
}
trace(2, "\n");
}
}
error = sendpacket(sin6, RIPSIZE(nrt));
if (error == EAFNOSUPPORT && ifcp) {
/* Protocol not supported */
tracet(1, "Could not send info to %s (%s): "
"set IFF_UP to 0\n",
ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */
}
nrt = 0; nip = ripbuf->rip6_nets;
}

/*
* Generate RIP6_RESPONSE packets and send them.
*/
static void
ripsend(struct ifc *ifcp, struct sockaddr_in6 *sin6, int flag)
{
struct riprt *rrt;
struct in6_addr *nh; /* next hop */
int maxrte;

if (qflag)
return;

if (ifcp == NULL) {
/*
* Request from non-link local address is not
* a regular route6d update.
*/
maxrte = (IFMINMTU - sizeof(struct ip6_hdr) -
sizeof(struct udphdr) -
sizeof(struct rip6) + sizeof(struct netinfo6)) /
sizeof(struct netinfo6);
nrt = 0; nip = ripbuf->rip6_nets; nh = NULL;
for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
if (rrt->rrt_rflags & RRTF_NOADVERTISE)
continue;
/* Put the route to the buffer */
*nip = rrt->rrt_info;
nip++; nrt++;
if (nrt == maxrte) {
ripflush(NULL, sin6);
nh = NULL;
}
}
if (nrt) /* Send last packet */
ripflush(NULL, sin6);
return;
}

if ((flag & RRTF_SENDANYWAY) == 0 &&
(qflag || (ifcp->ifc_flags & IFF_LOOPBACK)))
return;

/* -N: no use */
if (iff_find(ifcp, 'N') != NULL)
return;

/* -T: generate default route only */
if (iff_find(ifcp, 'T') != NULL) {
struct netinfo6 rrt_info;
memset(&rrt_info, 0, sizeof(struct netinfo6));
rrt_info.rip6_dest = in6addr_any;
rrt_info.rip6_plen = 0;
rrt_info.rip6_metric = 1;
rrt_info.rip6_metric += ifcp->ifc_metric;
rrt_info.rip6_tag = htons(routetag & 0xffff);
nip = ripbuf->rip6_nets;
*nip = rrt_info;
nrt = 1;
ripflush(ifcp, sin6);
return;
}

maxrte = (ifcp->ifc_mtu - sizeof(struct ip6_hdr) -
sizeof(struct udphdr) -
sizeof(struct rip6) + sizeof(struct netinfo6)) /
sizeof(struct netinfo6);

nrt = 0; nip = ripbuf->rip6_nets; nh = NULL;
for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
if (rrt->rrt_rflags & RRTF_NOADVERTISE)
continue;

/* Need to check filter here */
if (out_filter(rrt, ifcp) == 0)
continue;

/* Check split horizon and other conditions */
if (tobeadv(rrt, ifcp) == 0)
continue;

/* Only considers the routes with flag if specified */
if ((flag & RRTF_CHANGED) &&
(rrt->rrt_rflags & RRTF_CHANGED) == 0)
continue;

/* Check nexthop */
if (rrt->rrt_index == ifcp->ifc_index &&
!IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_gw) &&
(rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) == 0) {
if (nh == NULL || !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw)) {
if (nrt == maxrte - 2)
ripflush(ifcp, sin6);
nip->rip6_dest = rrt->rrt_gw;
if (IN6_IS_ADDR_LINKLOCAL(&nip->rip6_dest))
SET_IN6_LINKLOCAL_IFINDEX(nip->rip6_dest, 0);
nip->rip6_plen = 0;
nip->rip6_tag = 0;
nip->rip6_metric = NEXTHOP_METRIC;
nh = &rrt->rrt_gw;
nip++; nrt++;
}
} else if (nh && (rrt->rrt_index != ifcp->ifc_index ||
!IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw) ||
rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)) {
/* Reset nexthop */
if (nrt == maxrte - 2)
ripflush(ifcp, sin6);
memset(nip, 0, sizeof(struct netinfo6));
nip->rip6_metric = NEXTHOP_METRIC;
nh = NULL;
nip++; nrt++;
}

/* Put the route to the buffer */
*nip = rrt->rrt_info;
nip++; nrt++;
if (nrt == maxrte) {
ripflush(ifcp, sin6);
nh = NULL;
}
}
if (nrt) /* Send last packet */
ripflush(ifcp, sin6);
}

/*
* outbound filter logic, per-route/interface.
*/
static int
out_filter(struct riprt *rrt, struct ifc *ifcp)
{
struct iff *iffp;
struct in6_addr ia;
int ok;

/*
* -A: filter out less specific routes, if we have aggregated
* route configured.
*/
for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
if (iffp->iff_type != 'A')
continue;
if (rrt->rrt_info.rip6_plen <= iffp->iff_plen)
continue;
ia = rrt->rrt_info.rip6_dest;
applyplen(&ia, iffp->iff_plen);
if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr))
return 0;
}

/*
* if it is an aggregated route, advertise it only to the
* interfaces specified on -A.
*/
if ((rrt->rrt_rflags & RRTF_AGGREGATE) != 0) {
ok = 0;
for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
if (iffp->iff_type != 'A')
continue;
if (rrt->rrt_info.rip6_plen == iffp->iff_plen &&
IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
&iffp->iff_addr)) {
ok = 1;
break;
}
}
if (!ok)
return 0;
}

/*
* -O: advertise only if prefix matches the configured prefix.
*/
if (iff_find(ifcp, 'O')) {
ok = 0;
for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
if (iffp->iff_type != 'O')
continue;
if (rrt->rrt_info.rip6_plen < iffp->iff_plen)
continue;
ia = rrt->rrt_info.rip6_dest;
applyplen(&ia, iffp->iff_plen);
if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
ok = 1;
break;
}
}
if (!ok)
return 0;
}

/* the prefix should be advertised */
return 1;
}

/*
* Determine if the route is to be advertised on the specified interface.
* It checks options specified in the arguments and the split horizon rule.
*/
static int
tobeadv(struct riprt *rrt, struct ifc *ifcp)
{

/* Special care for static routes */
if (rrt->rrt_flags & RTF_STATIC) {
/* XXX don't advertise reject/blackhole routes */
if (rrt->rrt_flags & (RTF_REJECT | RTF_BLACKHOLE))
return 0;

if (Sflag) /* Yes, advertise it anyway */
return 1;
if (sflag && rrt->rrt_index != ifcp->ifc_index)
return 1;
return 0;
}
/* Regular split horizon */
if (hflag == 0 && rrt->rrt_index == ifcp->ifc_index)
return 0;
return 1;
}

/*
* Send a rip packet actually.
*/
static int
sendpacket(struct sockaddr_in6 *sin6, int len)
{
struct msghdr m;
struct cmsghdr *cm;
struct iovec iov[2];
u_char cmsgbuf[256];
struct in6_pktinfo *pi;
int idx;
struct sockaddr_in6 sincopy;

/* do not overwrite the given sin */
sincopy = *sin6;
sin6 = &sincopy;

if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) ||
IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
/* XXX: do not mix the interface index and link index */
idx = IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr);
SET_IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr, 0);
sin6->sin6_scope_id = idx;
} else
idx = 0;

m.msg_name = (caddr_t)sin6;
m.msg_namelen = sizeof(*sin6);
iov[0].iov_base = (caddr_t)ripbuf;
iov[0].iov_len = len;
m.msg_iov = iov;
m.msg_iovlen = 1;
if (!idx) {
m.msg_control = NULL;
m.msg_controllen = 0;
} else {
memset(cmsgbuf, 0, sizeof(cmsgbuf));
cm = (struct cmsghdr *)cmsgbuf;
m.msg_control = (caddr_t)cm;
m.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo));

cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
cm->cmsg_level = IPPROTO_IPV6;
cm->cmsg_type = IPV6_PKTINFO;
pi = (struct in6_pktinfo *)CMSG_DATA(cm);
memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*::*/
pi->ipi6_ifindex = idx;
}

if (sendmsg(ripsock, &m, 0 /*MSG_DONTROUTE*/) < 0) {
trace(1, "sendmsg: %s\n", strerror(errno));
return errno;
}

return 0;
}

/*
* Receive and process RIP packets. Update the routes/kernel forwarding
* table if necessary.
*/
static void
riprecv(void)
{
struct ifc *ifcp, *ic;
struct sockaddr_in6 fsock;
struct in6_addr nh; /* next hop */
struct rip6 *rp;
struct netinfo6 *np, *nq;
struct riprt *rrt;
ssize_t len, nn;
unsigned int need_trigger, idx;
char buf[4 * RIP6_MAXMTU];
time_t t;
struct msghdr m;
struct cmsghdr *cm;
struct iovec iov[2];
u_char cmsgbuf[256];
struct in6_pktinfo *pi;
struct iff *iffp;
struct in6_addr ia;
int ok;
time_t t_half_lifetime;

need_trigger = 0;

m.msg_name = (caddr_t)&fsock;
m.msg_namelen = sizeof(fsock);
iov[0].iov_base = (caddr_t)buf;
iov[0].iov_len = sizeof(buf);
m.msg_iov = iov;
m.msg_iovlen = 1;
cm = (struct cmsghdr *)cmsgbuf;
m.msg_control = (caddr_t)cm;
m.msg_controllen = sizeof(cmsgbuf);
if ((len = recvmsg(ripsock, &m, 0)) < 0) {
fatal("recvmsg");
}
idx = 0;
for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m);
cm;
cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) {
if (cm->cmsg_level == IPPROTO_IPV6 &&
cm->cmsg_type == IPV6_PKTINFO) {
pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
idx = pi->ipi6_ifindex;
break;
}
}
if (idx && IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr))
SET_IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr, idx);

if (len < (int)sizeof(struct rip6)) {
trace(1, "Packet too short\n");
return;
}

nh = fsock.sin6_addr;
nn = (len - sizeof(struct rip6) + sizeof(struct netinfo6)) /
sizeof(struct netinfo6);
rp = (struct rip6 *)buf;
np = rp->rip6_nets;

if (rp->rip6_vers != RIP6_VERSION) {
trace(1, "Incorrect RIP version %d\n", rp->rip6_vers);
return;
}
if (rp->rip6_cmd == RIP6_REQUEST) {
if (idx && idx < (unsigned)nindex2ifc) {
ifcp = index2ifc[idx];
riprequest(ifcp, np, nn, &fsock);
} else {
riprequest(NULL, np, nn, &fsock);
}
return;
}

if (!IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) {
trace(1, "Packets from non-ll addr: %s\n",
inet6_n2p(&fsock.sin6_addr));
return; /* Ignore packets from non-link-local addr */
}
idx = IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr);
ifcp = (idx < (unsigned)nindex2ifc) ? index2ifc[idx] : NULL;
if (!ifcp) {
trace(1, "Packets to unknown interface index %d\n", idx);
return; /* Ignore it */
}
if (IN6_ARE_ADDR_EQUAL(&ifcp->ifc_mylladdr, &fsock.sin6_addr))
return; /* The packet is from me; ignore */
if (rp->rip6_cmd != RIP6_RESPONSE) {
trace(1, "Invalid command %d\n", rp->rip6_cmd);
return;
}

/* -N: no use */
if (iff_find(ifcp, 'N') != NULL)
return;

tracet(1, "Recv(%s): from %s.%d info(%d)\n",
ifcp->ifc_name, inet6_n2p(&nh), ntohs(fsock.sin6_port), (int)nn);

t = time(NULL);
t_half_lifetime = t - (RIP_LIFETIME/2);
for (; nn; nn--, np++) {
if (np->rip6_metric == NEXTHOP_METRIC) {
/* modify neighbor address */
if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
nh = np->rip6_dest;
SET_IN6_LINKLOCAL_IFINDEX(nh, idx);
trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
} else if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) {
nh = fsock.sin6_addr;
trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
} else {
nh = fsock.sin6_addr;
trace(1, "\tInvalid Nexthop: %s\n",
inet6_n2p(&np->rip6_dest));
}
continue;
}
if (IN6_IS_ADDR_MULTICAST(&np->rip6_dest)) {
trace(1, "\tMulticast netinfo6: %s/%d [%d]\n",
inet6_n2p(&np->rip6_dest),
np->rip6_plen, np->rip6_metric);
continue;
}
if (IN6_IS_ADDR_LOOPBACK(&np->rip6_dest)) {
trace(1, "\tLoopback netinfo6: %s/%d [%d]\n",
inet6_n2p(&np->rip6_dest),
np->rip6_plen, np->rip6_metric);
continue;
}
if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
trace(1, "\tLink Local netinfo6: %s/%d [%d]\n",
inet6_n2p(&np->rip6_dest),
np->rip6_plen, np->rip6_metric);
continue;
}
/* may need to pass sitelocal prefix in some case, however*/
if (IN6_IS_ADDR_SITELOCAL(&np->rip6_dest) && !lflag) {
trace(1, "\tSite Local netinfo6: %s/%d [%d]\n",
inet6_n2p(&np->rip6_dest),
np->rip6_plen, np->rip6_metric);
continue;
}
trace(2, "\tnetinfo6: %s/%d [%d]",
inet6_n2p(&np->rip6_dest),
np->rip6_plen, np->rip6_metric);
if (np->rip6_tag)
trace(2, " tag=0x%04x", ntohs(np->rip6_tag) & 0xffff);
if (dflag >= 2) {
ia = np->rip6_dest;
applyplen(&ia, np->rip6_plen);
if (!IN6_ARE_ADDR_EQUAL(&ia, &np->rip6_dest))
trace(2, " [junk outside prefix]");
}

/*
* -L: listen only if the prefix matches the configuration
*/
ok = 1; /* if there's no L filter, it is ok */
for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
if (iffp->iff_type != 'L')
continue;
ok = 0;
if (np->rip6_plen < iffp->iff_plen)
continue;
/* special rule: ::/0 means default, not "in /0" */
if (iffp->iff_plen == 0 && np->rip6_plen > 0)
continue;
ia = np->rip6_dest;
applyplen(&ia, iffp->iff_plen);
if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
ok = 1;
break;
}
}
if (!ok) {
trace(2, " (filtered)\n");
continue;
}

trace(2, "\n");
np->rip6_metric++;
np->rip6_metric += ifcp->ifc_metric;
if (np->rip6_metric > HOPCNT_INFINITY6)
np->rip6_metric = HOPCNT_INFINITY6;

applyplen(&np->rip6_dest, np->rip6_plen);
if ((rrt = rtsearch(np, NULL)) != NULL) {
if (rrt->rrt_t == 0)
continue; /* Intf route has priority */
nq = &rrt->rrt_info;
if (nq->rip6_metric > np->rip6_metric) {
if (rrt->rrt_index == ifcp->ifc_index &&
IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
/* Small metric from the same gateway */
nq->rip6_metric = np->rip6_metric;
} else {
/* Better route found */
rrt->rrt_index = ifcp->ifc_index;
/* Update routing table */
delroute(nq, &rrt->rrt_gw);
rrt->rrt_gw = nh;
*nq = *np;
addroute(rrt, &nh, ifcp);
}
rrt->rrt_rflags |= RRTF_CHANGED;
rrt->rrt_t = t;
need_trigger = 1;
} else if (nq->rip6_metric < np->rip6_metric &&
rrt->rrt_index == ifcp->ifc_index &&
IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
/* Got worse route from same gw */
nq->rip6_metric = np->rip6_metric;
rrt->rrt_t = t;
rrt->rrt_rflags |= RRTF_CHANGED;
need_trigger = 1;
} else if (nq->rip6_metric == np->rip6_metric &&
np->rip6_metric < HOPCNT_INFINITY6) {
if (rrt->rrt_index == ifcp->ifc_index &&
IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
/* same metric, same route from same gw */
rrt->rrt_t = t;
} else if (rrt->rrt_t < t_half_lifetime) {
/* Better route found */
rrt->rrt_index = ifcp->ifc_index;
/* Update routing table */
delroute(nq, &rrt->rrt_gw);
rrt->rrt_gw = nh;
*nq = *np;
addroute(rrt, &nh, ifcp);
rrt->rrt_rflags |= RRTF_CHANGED;
rrt->rrt_t = t;
}
}
/*
* if nq->rip6_metric == HOPCNT_INFINITY6 then
* do not update age value. Do nothing.
*/
} else if (np->rip6_metric < HOPCNT_INFINITY6) {
/* Got a new valid route */
if ((rrt = MALLOC(struct riprt)) == NULL) {
fatal("malloc: struct riprt");
}
memset(rrt, 0, sizeof(*rrt));
nq = &rrt->rrt_info;

rrt->rrt_same = NULL;
rrt->rrt_index = ifcp->ifc_index;
rrt->rrt_flags = RTF_UP|RTF_GATEWAY;
rrt->rrt_gw = nh;
*nq = *np;
applyplen(&nq->rip6_dest, nq->rip6_plen);
if (nq->rip6_plen == sizeof(struct in6_addr) * 8)
rrt->rrt_flags |= RTF_HOST;

/* Put the route to the list */
rrt->rrt_next = riprt;
riprt = rrt;
/* Update routing table */
addroute(rrt, &nh, ifcp);
rrt->rrt_rflags |= RRTF_CHANGED;
need_trigger = 1;
rrt->rrt_t = t;
}
}
/* XXX need to care the interval between triggered updates */
if (need_trigger) {
if (nextalarm > time(NULL) + RIP_TRIG_INT6_MAX) {
for (ic = ifc; ic; ic = ic->ifc_next) {
if (ifcp->ifc_index == ic->ifc_index)
continue;
if (ic->ifc_flags & IFF_UP)
ripsend(ic, &ic->ifc_ripsin,
RRTF_CHANGED);
}
}
/* Reset the flag */
for (rrt = riprt; rrt; rrt = rrt->rrt_next)
rrt->rrt_rflags &= ~RRTF_CHANGED;
}
}

/*
* Send all routes request packet to the specified interface.
*/
static void
sendrequest(struct ifc *ifcp)
{
struct netinfo6 *np;
int error;

if (ifcp->ifc_flags & IFF_LOOPBACK)
return;
ripbuf->rip6_cmd = RIP6_REQUEST;
np = ripbuf->rip6_nets;
memset(np, 0, sizeof(struct netinfo6));
np->rip6_metric = HOPCNT_INFINITY6;
tracet(1, "Send rtdump Request to %s (%s)\n",
ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1));
if (error == EAFNOSUPPORT) {
/* Protocol not supported */
tracet(1, "Could not send rtdump Request to %s (%s): "
"set IFF_UP to 0\n",
ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
ifcp->ifc_flags &= ~IFF_UP; /* As if down for AF_INET6 */
}
ripbuf->rip6_cmd = RIP6_RESPONSE;
}

/*
* Process a RIP6_REQUEST packet.
*/
static void
riprequest(struct ifc *ifcp, struct netinfo6 *np, int nn,
struct sockaddr_in6 *sin6)
{
int i;
struct riprt *rrt;

if (!(nn == 1 && IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest) &&
np->rip6_plen == 0 && np->rip6_metric == HOPCNT_INFINITY6)) {
/* Specific response, don't split-horizon */
trace(1, "\tRIP Request\n");
for (i = 0; i < nn; i++, np++) {
rrt = rtsearch(np, NULL);
if (rrt)
np->rip6_metric = rrt->rrt_info.rip6_metric;
else
np->rip6_metric = HOPCNT_INFINITY6;
}
(void)sendpacket(sin6, RIPSIZE(nn));
return;
}
/* Whole routing table dump */
trace(1, "\tRIP Request -- whole routing table\n");
ripsend(ifcp, sin6, RRTF_SENDANYWAY);
}

/*
* Get information of each interface.
*/
static void
ifconfig(void)
{
struct ifaddrs *ifap, *ifa;
struct ifc *ifcp;
struct ipv6_mreq mreq;
int s;

if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
fatal("socket");
}

if (getifaddrs(&ifap) != 0) {
fatal("getifaddrs");
}

for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
ifcp = ifc_find(ifa->ifa_name);
/* we are interested in multicast-capable interfaces */
if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
continue;
if (!ifcp) {
/* new interface */
if ((ifcp = MALLOC(struct ifc)) == NULL) {
fatal("malloc: struct ifc");
}
memset(ifcp, 0, sizeof(*ifcp));
ifcp->ifc_index = -1;
ifcp->ifc_next = ifc;
ifc = ifcp;
nifc++;
ifcp->ifc_name = xstrdup(ifa->ifa_name);
ifcp->ifc_addr = 0;
ifcp->ifc_filter = 0;
ifcp->ifc_flags = ifa->ifa_flags;
trace(1, "newif %s <%s>\n", ifcp->ifc_name,
ifflags(ifcp->ifc_flags));
if (!strcmp(ifcp->ifc_name, LOOPBACK_IF))
loopifcp = ifcp;
} else {
/* update flag, this may be up again */
if (ifcp->ifc_flags != ifa->ifa_flags) {
trace(1, "%s: <%s> -> ", ifcp->ifc_name,
ifflags(ifcp->ifc_flags));
trace(1, "<%s>\n", ifflags(ifa->ifa_flags));
ifcp->ifc_cflags |= IFC_CHANGED;
}
ifcp->ifc_flags = ifa->ifa_flags;
}
ifconfig1(ifa->ifa_name, ifa->ifa_addr, ifcp, s);
if ((ifcp->ifc_flags & (IFF_LOOPBACK | IFF_UP)) == IFF_UP
&& 0 < ifcp->ifc_index && !ifcp->ifc_joined) {
mreq.ipv6mr_multiaddr = ifcp->ifc_ripsin.sin6_addr;
mreq.ipv6mr_interface = ifcp->ifc_index;
if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
&mreq, sizeof(mreq)) < 0) {
fatal("IPV6_JOIN_GROUP");
}
trace(1, "join %s %s\n", ifcp->ifc_name, RIP6_DEST);
ifcp->ifc_joined++;
}
}
close(s);
freeifaddrs(ifap);
}

static void
ifconfig1(const char *name, const struct sockaddr *sa, struct ifc *ifcp, int s)
{
struct in6_ifreq ifr;
const struct sockaddr_in6 *sin6;
struct ifac *ifa;
int plen;
char buf[BUFSIZ];

sin6 = (const struct sockaddr_in6 *)sa;
if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) && !lflag)
return;
ifr.ifr_addr = *sin6;
strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
if (ioctl(s, SIOCGIFNETMASK_IN6, (char *)&ifr) < 0) {
fatal("ioctl: SIOCGIFNETMASK_IN6");
}
plen = sin6mask2len(&ifr.ifr_addr);
if ((ifa = ifa_match(ifcp, &sin6->sin6_addr, plen)) != NULL) {
/* same interface found */
/* need check if something changed */
/* XXX not yet implemented */
return;
}
/*
* New address is found
*/
if ((ifa = MALLOC(struct ifac)) == NULL) {
fatal("malloc: struct ifac");
}
memset(ifa, 0, sizeof(*ifa));
ifa->ifa_conf = ifcp;
ifa->ifa_next = ifcp->ifc_addr;
ifcp->ifc_addr = ifa;
ifa->ifa_addr = sin6->sin6_addr;
ifa->ifa_plen = plen;
if (ifcp->ifc_flags & IFF_POINTOPOINT) {
ifr.ifr_addr = *sin6;
if (ioctl(s, SIOCGIFDSTADDR_IN6, (char *)&ifr) < 0) {
fatal("ioctl: SIOCGIFDSTADDR_IN6");
}
ifa->ifa_raddr = ifr.ifr_dstaddr.sin6_addr;
inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, buf, sizeof(buf));
trace(1, "found address %s/%d -- %s\n",
inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen, buf);
} else {
trace(1, "found address %s/%d\n",
inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen);
}
if (ifcp->ifc_index < 0 && IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) {
ifcp->ifc_mylladdr = ifa->ifa_addr;
ifcp->ifc_index = IN6_LINKLOCAL_IFINDEX(ifa->ifa_addr);
memcpy(&ifcp->ifc_ripsin, &ripsin, ripsin.ss_len);
SET_IN6_LINKLOCAL_IFINDEX(ifcp->ifc_ripsin.sin6_addr,
ifcp->ifc_index);
setindex2ifc(ifcp->ifc_index, ifcp);
ifcp->ifc_mtu = getifmtu(ifcp->ifc_index);
if (ifcp->ifc_mtu > RIP6_MAXMTU)
ifcp->ifc_mtu = RIP6_MAXMTU;
if (ioctl(s, SIOCGIFMETRIC, (char *)&ifr) < 0) {
fatal("ioctl: SIOCGIFMETRIC");
}
ifcp->ifc_metric = ifr.ifr_metric;
trace(1, "\tindex: %d, mtu: %d, metric: %d\n",
ifcp->ifc_index, ifcp->ifc_mtu, ifcp->ifc_metric);
} else
ifcp->ifc_cflags |= IFC_CHANGED;
}

/*
* Receive and process routing messages.
* Update interface information as necessary.
*/
static void
rtrecv(void)
{
char buf[BUFSIZ];
char *p, *q;
struct rt_msghdr *rtm;
struct ifa_msghdr *ifam;
struct if_msghdr *ifm;
int len;
struct ifc *ifcp, *ic;
int iface = 0, rtable = 0;
struct sockaddr_in6 *rta[RTAX_MAX];
struct sockaddr_in6 mask;
int i, addrs;
struct riprt *rrt;

if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
perror("read from rtsock");
exit(1);
}
if (len < (int)sizeof(*rtm)) {
trace(1, "short read from rtsock: %d (should be > %lu)\n",
len, (u_long)sizeof(*rtm));
return;
}
if (dflag >= 2) {
fprintf(stderr, "rtmsg:\n");
for (i = 0; i < len; i++) {
fprintf(stderr, "%02x ", buf[i] & 0xff);
if (i % 16 == 15) fprintf(stderr, "\n");
}
fprintf(stderr, "\n");
}

for (p = buf; p - buf < len; p += ((struct rt_msghdr *)p)->rtm_msglen) {
/* safety against bogus message */
if (((struct rt_msghdr *)p)->rtm_msglen <= 0) {
trace(1, "bogus rtmsg: length=%d\n",
((struct rt_msghdr *)p)->rtm_msglen);
break;
}
rtm = NULL;
ifam = NULL;
ifm = NULL;
switch (((struct rt_msghdr *)p)->rtm_type) {
case RTM_NEWADDR:
case RTM_DELADDR:
ifam = (struct ifa_msghdr *)p;
addrs = ifam->ifam_addrs;
q = (char *)(ifam + 1);
break;
case RTM_IFINFO:
ifm = (struct if_msghdr *)p;
addrs = ifm->ifm_addrs;
q = (char *)(ifm + 1);
break;
default:
rtm = (struct rt_msghdr *)p;
addrs = rtm->rtm_addrs;
q = (char *)(rtm + 1);
if (rtm->rtm_version != RTM_VERSION) {
trace(1, "unexpected rtmsg version %d "
"(should be %d)\n",
rtm->rtm_version, RTM_VERSION);
continue;
}
if (rtm->rtm_pid == pid) {
#if 0
trace(1, "rtmsg looped back to me, ignored\n");
#endif
continue;
}
break;
}
memset(&rta, 0, sizeof(rta));
for (i = 0; i < RTAX_MAX; i++) {
if (addrs & (1 << i)) {
rta[i] = (struct sockaddr_in6 *)q;
q += ROUNDUP(rta[i]->sin6_len);
}
}

trace(1, "rtsock: %s (addrs=%x)\n",
rttypes((struct rt_msghdr *)p), addrs);
if (dflag >= 2) {
for (i = 0;
i < ((struct rt_msghdr *)p)->rtm_msglen;
i++) {
fprintf(stderr, "%02x ", p[i] & 0xff);
if (i % 16 == 15) fprintf(stderr, "\n");
}
fprintf(stderr, "\n");
}

/*
* Easy ones first.
*
* We may be able to optimize by using ifm->ifm_index or
* ifam->ifam_index. For simplicity we don't do that here.
*/
switch (((struct rt_msghdr *)p)->rtm_type) {
case RTM_NEWADDR:
case RTM_IFINFO:
iface++;
continue;
case RTM_ADD:
rtable++;
continue;
case RTM_LOSING:
case RTM_MISS:
case RTM_GET:
case RTM_LOCK:
/* nothing to be done here */
trace(1, "\tnothing to be done, ignored\n");
continue;
}

#if 0
if (rta[RTAX_DST] == NULL) {
trace(1, "\tno destination, ignored\n");
continue;
}
if (rta[RTAX_DST]->sin6_family != AF_INET6) {
trace(1, "\taf mismatch, ignored\n");
continue;
}
if (IN6_IS_ADDR_LINKLOCAL(&rta[RTAX_DST]->sin6_addr)) {
trace(1, "\tlinklocal destination, ignored\n");
continue;
}
if (IN6_ARE_ADDR_EQUAL(&rta[RTAX_DST]->sin6_addr, &in6addr_loopback)) {
trace(1, "\tloopback destination, ignored\n");
continue; /* Loopback */
}
if (IN6_IS_ADDR_MULTICAST(&rta[RTAX_DST]->sin6_addr)) {
trace(1, "\tmulticast destination, ignored\n");
continue;
}
#endif

/* hard ones */
switch (((struct rt_msghdr *)p)->rtm_type) {
case RTM_NEWADDR:
case RTM_IFINFO:
case RTM_ADD:
case RTM_LOSING:
case RTM_MISS:
case RTM_GET:
case RTM_LOCK:
/* should already be handled */
fatal("rtrecv: never reach here");
/* NOTREACHED */
case RTM_DELETE:
if (!rta[RTAX_DST] || !rta[RTAX_GATEWAY]) {
trace(1, "\tsome of dst/gw/netamsk are "
"unavailable, ignored\n");
break;
}
if ((rtm->rtm_flags & RTF_HOST) != 0) {
mask.sin6_len = sizeof(mask);
memset(&mask.sin6_addr, 0xff,
sizeof(mask.sin6_addr));
rta[RTAX_NETMASK] = &mask;
} else if (!rta[RTAX_NETMASK]) {
trace(1, "\tsome of dst/gw/netamsk are "
"unavailable, ignored\n");
break;
}
if (rt_del(rta[RTAX_DST], rta[RTAX_GATEWAY],
rta[RTAX_NETMASK]) == 0) {
rtable++; /*just to be sure*/
}
break;
case RTM_CHANGE:
case RTM_REDIRECT:
trace(1, "\tnot supported yet, ignored\n");
break;
case RTM_DELADDR:
if (!rta[RTAX_NETMASK] || !rta[RTAX_IFA]) {
trace(1, "\tno netmask or ifa given, ignored\n");
break;
}
if (ifam->ifam_index < nindex2ifc)
ifcp = index2ifc[ifam->ifam_index];
else
ifcp = NULL;
if (!ifcp) {
trace(1, "\tinvalid ifam_index %d, ignored\n",
ifam->ifam_index);
break;
}
if (!rt_deladdr(ifcp, rta[RTAX_IFA], rta[RTAX_NETMASK]))
iface++;
break;
case RTM_OLDADD:
case RTM_OLDDEL:
trace(1, "\tnot supported yet, ignored\n");
break;
}

}

if (iface) {
trace(1, "rtsock: reconfigure interfaces, refresh interface routes\n");
ifconfig();
for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
if (ifcp->ifc_cflags & IFC_CHANGED) {
if (ifrt(ifcp, 1)) {
for (ic = ifc; ic; ic = ic->ifc_next) {
if (ifcp->ifc_index == ic->ifc_index)
continue;
if (ic->ifc_flags & IFF_UP)
ripsend(ic, &ic->ifc_ripsin,
RRTF_CHANGED);
}
/* Reset the flag */
for (rrt = riprt; rrt; rrt = rrt->rrt_next)
rrt->rrt_rflags &= ~RRTF_CHANGED;
}
ifcp->ifc_cflags &= ~IFC_CHANGED;
}
}
if (rtable) {
trace(1, "rtsock: read routing table again\n");
krtread(1);
}
}

/*
* remove specified route from the internal routing table.
*/
static int
rt_del(const struct sockaddr_in6 *sdst, const struct sockaddr_in6 *sgw,
const struct sockaddr_in6 *smask)
{
const struct in6_addr *dst = NULL;
const struct in6_addr *gw = NULL;
int prefix;
struct netinfo6 ni6;
struct riprt *rrt = NULL;
time_t t_lifetime;

if (sdst->sin6_family != AF_INET6) {
trace(1, "\tother AF, ignored\n");
return -1;
}
if (IN6_IS_ADDR_LINKLOCAL(&sdst->sin6_addr)
|| IN6_ARE_ADDR_EQUAL(&sdst->sin6_addr, &in6addr_loopback)
|| IN6_IS_ADDR_MULTICAST(&sdst->sin6_addr)) {
trace(1, "\taddress %s not interesting, ignored\n",
inet6_n2p(&sdst->sin6_addr));
return -1;
}
dst = &sdst->sin6_addr;
if (sgw->sin6_family == AF_INET6) {
/* easy case */
gw = &sgw->sin6_addr;
prefix = sin6mask2len(smask);
} else if (sgw->sin6_family == AF_LINK) {
/*
* Interface route... a hard case. We need to get the prefix
* length from the kernel, but we now are parsing rtmsg.
* We'll purge matching routes from my list, then get the
* fresh list.
*/
struct riprt *longest;
trace(1, "\t%s is an interface route, guessing prefixlen\n",
inet6_n2p(dst));
longest = NULL;
for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
if (IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
&sdst->sin6_addr)
&& IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) {
if (!longest
|| longest->rrt_info.rip6_plen <
rrt->rrt_info.rip6_plen) {
longest = rrt;
}
}
}
rrt = longest;
if (!rrt) {
trace(1, "\tno matching interface route found\n");
return -1;
}
gw = &in6addr_loopback;
prefix = rrt->rrt_info.rip6_plen;
} else {
trace(1, "\tunsupported af: (gw=%d)\n", sgw->sin6_family);
return -1;
}

trace(1, "\tdeleting %s/%d ", inet6_n2p(dst), prefix);
trace(1, "gw %s\n", inet6_n2p(gw));
t_lifetime = time(NULL) - RIP_LIFETIME;
/* age route for interface address */
memset(&ni6, 0, sizeof(ni6));
ni6.rip6_dest = *dst;
ni6.rip6_plen = prefix;
applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/
trace(1, "\tfind route %s/%d\n", inet6_n2p(&ni6.rip6_dest),
ni6.rip6_plen);
if (!rrt && (rrt = rtsearch(&ni6, NULL)) == NULL) {
trace(1, "\tno route found\n");
return -1;
}
#if 0
if ((rrt->rrt_flags & RTF_STATIC) == 0) {
trace(1, "\tyou can delete static routes only\n");
} else
#endif
if (!IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, gw)) {
trace(1, "\tgw mismatch: %s <-> ",
inet6_n2p(&rrt->rrt_gw));
trace(1, "%s\n", inet6_n2p(gw));
} else {
trace(1, "\troute found, age it\n");
if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
rrt->rrt_t = t_lifetime;
rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
}
}
return 0;
}

/*
* remove specified address from internal interface/routing table.
*/
static int
rt_deladdr(struct ifc *ifcp, const struct sockaddr_in6 *sifa,
const struct sockaddr_in6 *smask)
{
const struct in6_addr *addr = NULL;
int prefix;
struct ifac *ifa = NULL;
struct netinfo6 ni6;
struct riprt *rrt = NULL;
time_t t_lifetime;
int updated = 0;

if (sifa->sin6_family != AF_INET6) {
trace(1, "\tother AF, ignored\n");
return -1;
}
addr = &sifa->sin6_addr;
prefix = sin6mask2len(smask);

trace(1, "\tdeleting %s/%d from %s\n",
inet6_n2p(addr), prefix, ifcp->ifc_name);
ifa = ifa_match(ifcp, addr, prefix);
if (!ifa) {
trace(1, "\tno matching ifa found for %s/%d on %s\n",
inet6_n2p(addr), prefix, ifcp->ifc_name);
return -1;
}
if (ifa->ifa_conf != ifcp) {
trace(1, "\taddress table corrupt: back pointer does not match "
"(%s != %s)\n",
ifcp->ifc_name, ifa->ifa_conf->ifc_name);
return -1;
}
/* remove ifa from interface */
if (ifcp->ifc_addr == ifa)
ifcp->ifc_addr = ifa->ifa_next;
else {
struct ifac *p;
for (p = ifcp->ifc_addr; p; p = p->ifa_next) {
if (p->ifa_next == ifa) {
p->ifa_next = ifa->ifa_next;
break;
}
}
}
ifa->ifa_next = NULL;
ifa->ifa_conf = NULL;
t_lifetime = time(NULL) - RIP_LIFETIME;
/* age route for interface address */
memset(&ni6, 0, sizeof(ni6));
ni6.rip6_dest = ifa->ifa_addr;
ni6.rip6_plen = ifa->ifa_plen;
applyplen(&ni6.rip6_dest, ni6.rip6_plen);
trace(1, "\tfind interface route %s/%d on %d\n",
inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, ifcp->ifc_index);
if ((rrt = rtsearch(&ni6, NULL)) != NULL) {
struct in6_addr none;
memset(&none, 0, sizeof(none));
if (rrt->rrt_index == ifcp->ifc_index &&
(IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &none) ||
IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw))) {
trace(1, "\troute found, age it\n");
if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
rrt->rrt_t = t_lifetime;
rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
}
updated++;
} else {
trace(1, "\tnon-interface route found: %s/%d on %d\n",
inet6_n2p(&rrt->rrt_info.rip6_dest),
rrt->rrt_info.rip6_plen,
rrt->rrt_index);
}
} else
trace(1, "\tno interface route found\n");
/* age route for p2p destination */
if (ifcp->ifc_flags & IFF_POINTOPOINT) {
memset(&ni6, 0, sizeof(ni6));
ni6.rip6_dest = ifa->ifa_raddr;
ni6.rip6_plen = 128;
applyplen(&ni6.rip6_dest, ni6.rip6_plen); /*to be sure*/
trace(1, "\tfind p2p route %s/%d on %d\n",
inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen,
ifcp->ifc_index);
if ((rrt = rtsearch(&ni6, NULL)) != NULL) {
if (rrt->rrt_index == ifcp->ifc_index &&
IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &ifa->ifa_addr)) {
trace(1, "\troute found, age it\n");
if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
rrt->rrt_t = t_lifetime;
rrt->rrt_info.rip6_metric =
HOPCNT_INFINITY6;
updated++;
}
} else {
trace(1, "\tnon-p2p route found: %s/%d on %d\n",
inet6_n2p(&rrt->rrt_info.rip6_dest),
rrt->rrt_info.rip6_plen,
rrt->rrt_index);
}
} else
trace(1, "\tno p2p route found\n");
}
return updated ? 0 : -1;
}

/*
* Get each interface address and put those interface routes to the route
* list.
*/
static int
ifrt(struct ifc *ifcp, int again)
{
struct ifac *ifa;
struct riprt *rrt = NULL, *search_rrt, *prev_rrt, *loop_rrt;
struct netinfo6 *np;
time_t t_lifetime;
int need_trigger = 0;

#if 0
if (ifcp->ifc_flags & IFF_LOOPBACK)
return 0; /* ignore loopback */
#endif

if (ifcp->ifc_flags & IFF_POINTOPOINT) {
ifrt_p2p(ifcp, again);
return 0;
}

for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
if (IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) {
#if 0
trace(1, "route: %s on %s: "
"skip linklocal interface address\n",
inet6_n2p(&ifa->ifa_addr), ifcp->ifc_name);
#endif
continue;
}
if (IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_addr)) {
#if 0
trace(1, "route: %s: skip unspec interface address\n",
ifcp->ifc_name);
#endif
continue;
}
if (IN6_IS_ADDR_LOOPBACK(&ifa->ifa_addr)) {
#if 0
trace(1, "route: %s: skip loopback address\n",
ifcp->ifc_name);
#endif
continue;
}
if (ifcp->ifc_flags & IFF_UP) {
if ((rrt = MALLOC(struct riprt)) == NULL)
fatal("malloc: struct riprt");
memset(rrt, 0, sizeof(*rrt));
rrt->rrt_same = NULL;
rrt->rrt_index = ifcp->ifc_index;
rrt->rrt_t = 0; /* don't age */
rrt->rrt_info.rip6_dest = ifa->ifa_addr;
rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
rrt->rrt_info.rip6_plen = ifa->ifa_plen;
if (ifa->ifa_plen == 128)
rrt->rrt_flags = RTF_HOST;
else
rrt->rrt_flags = RTF_CONNECTED;
rrt->rrt_rflags |= RRTF_CHANGED;
applyplen(&rrt->rrt_info.rip6_dest, ifa->ifa_plen);
memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
rrt->rrt_gw = ifa->ifa_addr;
np = &rrt->rrt_info;
search_rrt = rtsearch(np, &prev_rrt);
if (search_rrt != NULL) {
if (search_rrt->rrt_info.rip6_metric <=
rrt->rrt_info.rip6_metric) {
/* Already have better route */
if (!again) {
trace(1, "route: %s/%d: "
"already registered (%s)\n",
inet6_n2p(&np->rip6_dest), np->rip6_plen,
ifcp->ifc_name);
}
goto next;
}

if (prev_rrt)
prev_rrt->rrt_next = rrt->rrt_next;
else
riprt = rrt->rrt_next;
delroute(&rrt->rrt_info, &rrt->rrt_gw);
}
/* Attach the route to the list */
trace(1, "route: %s/%d: register route (%s)\n",
inet6_n2p(&np->rip6_dest), np->rip6_plen,
ifcp->ifc_name);
rrt->rrt_next = riprt;
riprt = rrt;
addroute(rrt, &rrt->rrt_gw, ifcp);
rrt = NULL;
sendrequest(ifcp);
ripsend(ifcp, &ifcp->ifc_ripsin, 0);
need_trigger = 1;
} else {
for (loop_rrt = riprt; loop_rrt; loop_rrt = loop_rrt->rrt_next) {
if (loop_rrt->rrt_index == ifcp->ifc_index) {
t_lifetime = time(NULL) - RIP_LIFETIME;
if (loop_rrt->rrt_t == 0 || loop_rrt->rrt_t > t_lifetime) {
loop_rrt->rrt_t = t_lifetime;
loop_rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
loop_rrt->rrt_rflags |= RRTF_CHANGED;
need_trigger = 1;
}
}
}
}
next:
if (rrt)
free(rrt);
}
return need_trigger;
}

/*
* there are couple of p2p interface routing models. "behavior" lets
* you pick one. it looks that gated behavior fits best with BSDs,
* since BSD kernels do not look at prefix length on p2p interfaces.
*/
static void
ifrt_p2p(struct ifc *ifcp, int again)
{
struct ifac *ifa;
struct riprt *rrt, *orrt, *prevrrt;
struct netinfo6 *np;
struct in6_addr addr, dest;
int advert, ignore, i;
#define P2PADVERT_NETWORK 1
#define P2PADVERT_ADDR 2
#define P2PADVERT_DEST 4
#define P2PADVERT_MAX 4
#define CISCO 0
#define GATED 1
#define ROUTE6D 2
#define BEHAVIOR GATED
const char *category = "";
const char *noadv;

for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
addr = ifa->ifa_addr;
dest = ifa->ifa_raddr;
applyplen(&addr, ifa->ifa_plen);
applyplen(&dest, ifa->ifa_plen);
advert = ignore = 0;
#if BEHAVIOR == CISCO
/*
* honor addr/plen, just like normal shared medium
* interface. this may cause trouble if you reuse
* addr/plen on other interfaces.
*
* advertise addr/plen.
*/
advert |= P2PADVERT_NETWORK;
#endif
#if BEHAVIOR == GATED
/*
* prefixlen on p2p interface is meaningless.
* advertise addr/128 and dest/128.
*
* do not install network route to route6d routing
* table (if we do, it would prevent route installation
* for other p2p interface that shares addr/plen).
*
* XXX what should we do if dest is ::? it will not
* get announced anyways (see following filter),
* but we need to think.
*/
advert |= P2PADVERT_ADDR;
advert |= P2PADVERT_DEST;
ignore |= P2PADVERT_NETWORK;
#endif
#if BEHAVIOR == ROUTE6D
/*
* just for testing. actually the code is redundant
* given the current p2p interface address assignment
* rule for kame kernel.
*
* intent:
* A/n -> announce A/n
* A B/n, A and B share prefix -> A/n (= B/n)
* A B/n, do not share prefix -> A/128 and B/128
* actually, A/64 and A B/128 are the only cases
* permitted by the kernel:
* A/64 -> A/64
* A B/128 -> A/128 and B/128
*/
if (!IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_raddr)) {
if (IN6_ARE_ADDR_EQUAL(&addr, &dest))
advert |= P2PADVERT_NETWORK;
else {
advert |= P2PADVERT_ADDR;
advert |= P2PADVERT_DEST;
ignore |= P2PADVERT_NETWORK;
}
} else
advert |= P2PADVERT_NETWORK;
#endif

for (i = 1; i <= P2PADVERT_MAX; i *= 2) {
if ((ignore & i) != 0)
continue;
if ((rrt = MALLOC(struct riprt)) == NULL) {
fatal("malloc: struct riprt");
}
memset(rrt, 0, sizeof(*rrt));
rrt->rrt_same = NULL;
rrt->rrt_index = ifcp->ifc_index;
rrt->rrt_t = 0; /* don't age */
switch (i) {
case P2PADVERT_NETWORK:
rrt->rrt_info.rip6_dest = ifa->ifa_addr;
rrt->rrt_info.rip6_plen = ifa->ifa_plen;
applyplen(&rrt->rrt_info.rip6_dest,
ifa->ifa_plen);
category = "network";
break;
case P2PADVERT_ADDR:
rrt->rrt_info.rip6_dest = ifa->ifa_addr;
rrt->rrt_info.rip6_plen = 128;
rrt->rrt_gw = in6addr_loopback;
category = "addr";
break;
case P2PADVERT_DEST:
rrt->rrt_info.rip6_dest = ifa->ifa_raddr;
rrt->rrt_info.rip6_plen = 128;
rrt->rrt_gw = ifa->ifa_addr;
category = "dest";
break;
}
if (IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_info.rip6_dest) ||
IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_info.rip6_dest)) {
#if 0
trace(1, "route: %s: skip unspec/linklocal "
"(%s on %s)\n", category, ifcp->ifc_name);
#endif
free(rrt);
continue;
}
if ((advert & i) == 0) {
rrt->rrt_rflags |= RRTF_NOADVERTISE;
noadv = ", NO-ADV";
} else
noadv = "";
rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
np = &rrt->rrt_info;
orrt = rtsearch(np, &prevrrt);
if (!orrt) {
/* Attach the route to the list */
trace(1, "route: %s/%d: register route "
"(%s on %s%s)\n",
inet6_n2p(&np->rip6_dest), np->rip6_plen,
category, ifcp->ifc_name, noadv);
rrt->rrt_next = riprt;
riprt = rrt;
} else if (rrt->rrt_index != orrt->rrt_index ||
rrt->rrt_info.rip6_metric != orrt->rrt_info.rip6_metric) {
/* swap route */
rrt->rrt_next = orrt->rrt_next;
if (prevrrt)
prevrrt->rrt_next = rrt;
else
riprt = rrt;
free(orrt);

trace(1, "route: %s/%d: update (%s on %s%s)\n",
inet6_n2p(&np->rip6_dest), np->rip6_plen,
category, ifcp->ifc_name, noadv);
} else {
/* Already found */
if (!again) {
trace(1, "route: %s/%d: "
"already registered (%s on %s%s)\n",
inet6_n2p(&np->rip6_dest),
np->rip6_plen, category,
ifcp->ifc_name, noadv);
}
free(rrt);
}
}
}
#undef P2PADVERT_NETWORK
#undef P2PADVERT_ADDR
#undef P2PADVERT_DEST
#undef P2PADVERT_MAX
}

static int
getifmtu(int ifindex)
{
int mib[6];
char *buf;
size_t msize;
struct if_msghdr *ifm;
int mtu;

mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = AF_INET6;
mib[4] = NET_RT_IFLIST;
mib[5] = ifindex;
if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) {
fatal("sysctl estimate NET_RT_IFLIST");
}
if ((buf = malloc(msize)) == NULL) {
fatal("malloc");
}
if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) {
fatal("sysctl NET_RT_IFLIST");
}
ifm = (struct if_msghdr *)buf;
mtu = ifm->ifm_data.ifi_mtu;

free(buf);
return mtu;
}

static const char *
rttypes(struct rt_msghdr *rtm)
{
#define RTTYPE(s, f) \
do { \
if (rtm->rtm_type == (f)) \
return (s); \
} while (0)
RTTYPE("ADD", RTM_ADD);
RTTYPE("DELETE", RTM_DELETE);
RTTYPE("CHANGE", RTM_CHANGE);
RTTYPE("GET", RTM_GET);
RTTYPE("LOSING", RTM_LOSING);
RTTYPE("REDIRECT", RTM_REDIRECT);
RTTYPE("MISS", RTM_MISS);
RTTYPE("LOCK", RTM_LOCK);
RTTYPE("OLDADD", RTM_OLDADD);
RTTYPE("OLDDEL", RTM_OLDDEL);
RTTYPE("NEWADDR", RTM_NEWADDR);
RTTYPE("DELADDR", RTM_DELADDR);
RTTYPE("IFINFO", RTM_IFINFO);
#ifdef RTM_OLDADD
RTTYPE("OLDADD", RTM_OLDADD);
#endif
#ifdef RTM_OLDDEL
RTTYPE("OLDDEL", RTM_OLDDEL);
#endif
#ifdef RTM_OIFINFO
RTTYPE("OIFINFO", RTM_OIFINFO);
#endif
#ifdef RTM_IFANNOUNCE
RTTYPE("IFANNOUNCE", RTM_IFANNOUNCE);
#endif
#ifdef RTM_NEWMADDR
RTTYPE("NEWMADDR", RTM_NEWMADDR);
#endif
#ifdef RTM_DELMADDR
RTTYPE("DELMADDR", RTM_DELMADDR);
#endif
#undef RTTYPE
return NULL;
}

static const char *
rtflags(struct rt_msghdr *rtm)
{
static char buf[BUFSIZ];

/*
* letter conflict should be okay. painful when *BSD diverges...
*/
strlcpy(buf, "", sizeof(buf));
#define RTFLAG(s, f) \
do { \
if (rtm->rtm_flags & (f)) \
strlcat(buf, (s), sizeof(buf)); \
} while (0)
RTFLAG("U", RTF_UP);
RTFLAG("G", RTF_GATEWAY);
RTFLAG("H", RTF_HOST);
RTFLAG("R", RTF_REJECT);
RTFLAG("D", RTF_DYNAMIC);
RTFLAG("M", RTF_MODIFIED);
RTFLAG("d", RTF_DONE);
#ifdef RTF_MASK
RTFLAG("m", RTF_MASK);
#endif
RTFLAG("C", RTF_CONNECTED);
#ifdef RTF_CLONED
RTFLAG("c", RTF_CLONED);
#endif
#ifdef RTF_PRCLONING
RTFLAG("c", RTF_PRCLONING);
#endif
#ifdef RTF_WASCLONED
RTFLAG("W", RTF_WASCLONED);
#endif
RTFLAG("S", RTF_STATIC);
RTFLAG("B", RTF_BLACKHOLE);
#ifdef RTF_PROTO3
RTFLAG("3", RTF_PROTO3);
#endif
RTFLAG("2", RTF_PROTO2);
RTFLAG("1", RTF_PROTO1);
#ifdef RTF_BROADCAST
RTFLAG("b", RTF_BROADCAST);
#endif
#ifdef RTF_DEFAULT
RTFLAG("d", RTF_DEFAULT);
#endif
#ifdef RTF_ISAROUTER
RTFLAG("r", RTF_ISAROUTER);
#endif
#ifdef RTF_TUNNEL
RTFLAG("T", RTF_TUNNEL);
#endif
#ifdef RTF_AUTH
RTFLAG("A", RTF_AUTH);
#endif
#ifdef RTF_CRYPT
RTFLAG("E", RTF_CRYPT);
#endif
#undef RTFLAG
return buf;
}

static const char *
ifflags(int flags)
{
static char buf[BUFSIZ];

strlcpy(buf, "", sizeof(buf));
#define IFFLAG(s, f) \
do { \
if (flags & (f)) { \
if (buf[0]) \
strlcat(buf, ",", sizeof(buf)); \
strlcat(buf, (s), sizeof(buf)); \
} \
} while (0)
IFFLAG("UP", IFF_UP);
IFFLAG("BROADCAST", IFF_BROADCAST);
IFFLAG("DEBUG", IFF_DEBUG);
IFFLAG("LOOPBACK", IFF_LOOPBACK);
IFFLAG("POINTOPOINT", IFF_POINTOPOINT);
#ifdef IFF_SMART
IFFLAG("SMART", IFF_SMART);
#endif
IFFLAG("RUNNING", IFF_RUNNING);
IFFLAG("NOARP", IFF_NOARP);
IFFLAG("PROMISC", IFF_PROMISC);
IFFLAG("ALLMULTI", IFF_ALLMULTI);
IFFLAG("OACTIVE", IFF_OACTIVE);
IFFLAG("SIMPLEX", IFF_SIMPLEX);
IFFLAG("LINK0", IFF_LINK0);
IFFLAG("LINK1", IFF_LINK1);
IFFLAG("LINK2", IFF_LINK2);
IFFLAG("MULTICAST", IFF_MULTICAST);
#undef IFFLAG
return buf;
}

static void
krtread(int again)
{
int mib[6];
size_t msize;
char *buf = NULL, *p, *lim;
struct rt_msghdr *rtm;
int retry;
const char *errmsg;

retry = 0;
buf = NULL;
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = AF_INET6; /* Address family */
mib[4] = NET_RT_DUMP; /* Dump the kernel routing table */
mib[5] = 0; /* No flags */
do {
retry++;
errmsg = NULL;
if (buf) {
free(buf);
buf = NULL;
}
if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) {
errmsg = "sysctl estimate";
continue;
}
if ((buf = malloc(msize)) == NULL) {
errmsg = "malloc";
continue;
}
if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) {
errmsg = "sysctl NET_RT_DUMP";
continue;
}
} while (retry < 5 && errmsg != NULL);
if (errmsg) {
fatal("%s (with %d retries, msize=%lu)", errmsg, retry,
(u_long)msize);
} else if (1 < retry)
syslog(LOG_INFO, "NET_RT_DUMP %d retries", retry);

lim = buf + msize;
for (p = buf; p < lim; p += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)p;
rt_entry(rtm, again);
}
free(buf);
}

static void
rt_entry(struct rt_msghdr *rtm, int again)
{
struct sockaddr_in6 *sin6_dst, *sin6_gw, *sin6_mask;
struct sockaddr_in6 *sin6_genmask, *sin6_ifp;
char *rtmp, *ifname = NULL;
struct riprt *rrt, *orrt;
struct netinfo6 *np;
int s;

sin6_dst = sin6_gw = sin6_mask = sin6_genmask = sin6_ifp = 0;
if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags &
(RTF_CONNECTED|RTF_BLACKHOLE)) {
return; /* not interested in the link route */
}
/* do not look at cloned routes */
#ifdef RTF_WASCLONED
if (rtm->rtm_flags & RTF_WASCLONED)
return;
#endif
#ifdef RTF_CLONED
if (rtm->rtm_flags & RTF_CLONED)
return;
#endif
/*
* do not look at dynamic routes.
* netbsd/openbsd cloned routes have UGHD.
*/
if (rtm->rtm_flags & RTF_DYNAMIC)
return;
rtmp = (char *)(rtm + 1);
/* Destination */
if ((rtm->rtm_addrs & RTA_DST) == 0)
return; /* ignore routes without destination address */
sin6_dst = (struct sockaddr_in6 *)rtmp;
rtmp += ROUNDUP(sin6_dst->sin6_len);
if (rtm->rtm_addrs & RTA_GATEWAY) {
sin6_gw = (struct sockaddr_in6 *)rtmp;
rtmp += ROUNDUP(sin6_gw->sin6_len);
}
if (rtm->rtm_addrs & RTA_NETMASK) {
sin6_mask = (struct sockaddr_in6 *)rtmp;
rtmp += ROUNDUP(sin6_mask->sin6_len);
}
if (rtm->rtm_addrs & RTA_GENMASK) {
sin6_genmask = (struct sockaddr_in6 *)rtmp;
rtmp += ROUNDUP(sin6_genmask->sin6_len);
}
if (rtm->rtm_addrs & RTA_IFP) {
sin6_ifp = (struct sockaddr_in6 *)rtmp;
rtmp += ROUNDUP(sin6_ifp->sin6_len);
}

/* Destination */
if (sin6_dst->sin6_family != AF_INET6)
return;
if (IN6_IS_ADDR_LINKLOCAL(&sin6_dst->sin6_addr))
return; /* Link-local */
if (IN6_ARE_ADDR_EQUAL(&sin6_dst->sin6_addr, &in6addr_loopback))
return; /* Loopback */
if (IN6_IS_ADDR_MULTICAST(&sin6_dst->sin6_addr))
return;

if ((rrt = MALLOC(struct riprt)) == NULL) {
fatal("malloc: struct riprt");
}
memset(rrt, 0, sizeof(*rrt));
np = &rrt->rrt_info;
rrt->rrt_same = NULL;
rrt->rrt_t = time(NULL);
if (aflag == 0 && (rtm->rtm_flags & RTF_STATIC))
rrt->rrt_t = 0; /* Don't age static routes */
if ((rtm->rtm_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST)
rrt->rrt_t = 0; /* Don't age non-gateway host routes */
np->rip6_tag = 0;
np->rip6_metric = rtm->rtm_rmx.rmx_hopcount;
if (np->rip6_metric < 1)
np->rip6_metric = 1;
rrt->rrt_flags = rtm->rtm_flags;
np->rip6_dest = sin6_dst->sin6_addr;

/* Mask or plen */
if (rtm->rtm_flags & RTF_HOST)
np->rip6_plen = 128; /* Host route */
else if (sin6_mask)
np->rip6_plen = sin6mask2len(sin6_mask);
else
np->rip6_plen = 0;

orrt = rtsearch(np, NULL);
if (orrt && orrt->rrt_info.rip6_metric != HOPCNT_INFINITY6) {
/* Already found */
if (!again) {
trace(1, "route: %s/%d flags %s: already registered\n",
inet6_n2p(&np->rip6_dest), np->rip6_plen,
rtflags(rtm));
}
free(rrt);
return;
}
/* Gateway */
if (!sin6_gw)
memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
else {
if (sin6_gw->sin6_family == AF_INET6)
rrt->rrt_gw = sin6_gw->sin6_addr;
else if (sin6_gw->sin6_family == AF_LINK) {
/* XXX in case ppp link? */
rrt->rrt_gw = in6addr_loopback;
} else
memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
}
trace(1, "route: %s/%d flags %s",
inet6_n2p(&np->rip6_dest), np->rip6_plen, rtflags(rtm));
trace(1, " gw %s", inet6_n2p(&rrt->rrt_gw));

/* Interface */
s = rtm->rtm_index;
if (s < nindex2ifc && index2ifc[s])
ifname = index2ifc[s]->ifc_name;
else {
trace(1, " not configured\n");
free(rrt);
return;
}
trace(1, " if %s sock %d", ifname, s);
rrt->rrt_index = s;

trace(1, "\n");

/* Check gateway */
if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) &&
!IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) {
trace(0, "***** Gateway %s is not a link-local address.\n",
inet6_n2p(&rrt->rrt_gw));
trace(0, "***** dest(%s) if(%s) -- Not optimized.\n",
inet6_n2p(&rrt->rrt_info.rip6_dest), ifname);
rrt->rrt_rflags |= RRTF_NH_NOT_LLADDR;
}

/* Put it to the route list */
if (orrt && orrt->rrt_info.rip6_metric == HOPCNT_INFINITY6) {
/* replace route list */
rrt->rrt_next = orrt->rrt_next;
*orrt = *rrt;
trace(1, "route: %s/%d flags %s: replace new route\n",
inet6_n2p(&np->rip6_dest), np->rip6_plen,
rtflags(rtm));
free(rrt);
} else {
rrt->rrt_next = riprt;
riprt = rrt;
}
}

static int
addroute(struct riprt *rrt, const struct in6_addr *gw, struct ifc *ifcp)
{
struct netinfo6 *np;
u_char buf[BUFSIZ], buf1[BUFSIZ], buf2[BUFSIZ];
struct rt_msghdr *rtm;
struct sockaddr_in6 *sin6;
int len;

np = &rrt->rrt_info;
inet_ntop(AF_INET6, (const void *)gw, (char *)buf1, sizeof(buf1));
inet_ntop(AF_INET6, (void *)&ifcp->ifc_mylladdr, (char *)buf2, sizeof(buf2));
tracet(1, "ADD: %s/%d gw %s [%d] ifa %s\n",
inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
np->rip6_metric - 1, buf2);
if (rtlog)
fprintf(rtlog, "%s: ADD: %s/%d gw %s [%d] ifa %s\n", hms(),
inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
np->rip6_metric - 1, buf2);
if (nflag)
return 0;

memset(buf, 0, sizeof(buf));
rtm = (struct rt_msghdr *)buf;
rtm->rtm_type = RTM_ADD;
rtm->rtm_version = RTM_VERSION;
rtm->rtm_seq = ++seq;
rtm->rtm_pid = pid;
rtm->rtm_flags = rrt->rrt_flags;
rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
rtm->rtm_rmx.rmx_hopcount = np->rip6_metric - 1;
rtm->rtm_inits = RTV_HOPCOUNT;
sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
/* Destination */
sin6->sin6_len = sizeof(struct sockaddr_in6);
sin6->sin6_family = AF_INET6;
sin6->sin6_addr = np->rip6_dest;
sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
/* Gateway */
sin6->sin6_len = sizeof(struct sockaddr_in6);
sin6->sin6_family = AF_INET6;
sin6->sin6_addr = *gw;
sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
/* Netmask */
sin6->sin6_len = sizeof(struct sockaddr_in6);
sin6->sin6_family = AF_INET6;
sin6->sin6_addr = *(plen2mask(np->rip6_plen));
sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));

len = (char *)sin6 - (char *)buf;
rtm->rtm_msglen = len;
if (write(rtsock, buf, len) > 0)
return 0;

if (errno == EEXIST) {
trace(0, "ADD: Route already exists %s/%d gw %s\n",
inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
if (rtlog)
fprintf(rtlog, "ADD: Route already exists %s/%d gw %s\n",
inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
} else {
trace(0, "Can not write to rtsock (addroute): %s\n",
strerror(errno));
if (rtlog)
fprintf(rtlog, "\tCan not write to rtsock: %s\n",
strerror(errno));
}
return -1;
}

static int
delroute(struct netinfo6 *np, struct in6_addr *gw)
{
u_char buf[BUFSIZ], buf2[BUFSIZ];
struct rt_msghdr *rtm;
struct sockaddr_in6 *sin6;
int len;

inet_ntop(AF_INET6, (void *)gw, (char *)buf2, sizeof(buf2));
tracet(1, "DEL: %s/%d gw %s\n", inet6_n2p(&np->rip6_dest),
np->rip6_plen, buf2);
if (rtlog)
fprintf(rtlog, "%s: DEL: %s/%d gw %s\n",
hms(), inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
if (nflag)
return 0;

memset(buf, 0, sizeof(buf));
rtm = (struct rt_msghdr *)buf;
rtm->rtm_type = RTM_DELETE;
rtm->rtm_version = RTM_VERSION;
rtm->rtm_seq = ++seq;
rtm->rtm_pid = pid;
rtm->rtm_flags = RTF_UP | RTF_GATEWAY;
if (np->rip6_plen == sizeof(struct in6_addr) * 8)
rtm->rtm_flags |= RTF_HOST;
rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
/* Destination */
sin6->sin6_len = sizeof(struct sockaddr_in6);
sin6->sin6_family = AF_INET6;
sin6->sin6_addr = np->rip6_dest;
sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
/* Gateway */
sin6->sin6_len = sizeof(struct sockaddr_in6);
sin6->sin6_family = AF_INET6;
sin6->sin6_addr = *gw;
sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
/* Netmask */
sin6->sin6_len = sizeof(struct sockaddr_in6);
sin6->sin6_family = AF_INET6;
sin6->sin6_addr = *(plen2mask(np->rip6_plen));
sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));

len = (char *)sin6 - (char *)buf;
rtm->rtm_msglen = len;
if (write(rtsock, buf, len) >= 0)
return 0;

if (errno == ESRCH) {
trace(0, "RTDEL: Route does not exist: %s/%d gw %s\n",
inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
if (rtlog)
fprintf(rtlog, "RTDEL: Route does not exist: %s/%d gw %s\n",
inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
} else {
trace(0, "Can not write to rtsock (delroute): %s\n",
strerror(errno));
if (rtlog)
fprintf(rtlog, "\tCan not write to rtsock: %s\n",
strerror(errno));
}
return -1;
}

static const char *
inet6_n2p(const struct in6_addr *p)
{
static char buf[BUFSIZ];

return inet_ntop(AF_INET6, (const void *)p, buf, sizeof(buf));
}

static void
ifrtdump(int sig)
{

ifdump(sig);
rtdump(sig);
}

static void
ifdump(int sig)
{
struct ifc *ifcp;
FILE *dump;
int i;

if (sig == 0)
dump = stderr;
else
if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
dump = stderr;

fprintf(dump, "%s: Interface Table Dump\n", hms());
fprintf(dump, " Number of interfaces: %d\n", nifc);
for (i = 0; i < 2; i++) {
fprintf(dump, " %sadvertising interfaces:\n", i ? "non-" : "");
for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
if (i == 0) {
if ((ifcp->ifc_flags & IFF_UP) == 0)
continue;
if (iff_find(ifcp, 'N') != NULL)
continue;
} else {
if (ifcp->ifc_flags & IFF_UP)
continue;
}
ifdump0(dump, ifcp);
}
}
fprintf(dump, "\n");
if (dump != stderr)
fclose(dump);
}

static void
ifdump0(FILE *dump, const struct ifc *ifcp)
{
struct ifac *ifa;
struct iff *iffp;
char buf[BUFSIZ];
const char *ft;
int addr;

fprintf(dump, " %s: index(%d) flags(%s) addr(%s) mtu(%d) metric(%d)\n",
ifcp->ifc_name, ifcp->ifc_index, ifflags(ifcp->ifc_flags),
inet6_n2p(&ifcp->ifc_mylladdr),
ifcp->ifc_mtu, ifcp->ifc_metric);
for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
if (ifcp->ifc_flags & IFF_POINTOPOINT) {
inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr,
buf, sizeof(buf));
fprintf(dump, "\t%s/%d -- %s\n",
inet6_n2p(&ifa->ifa_addr),
ifa->ifa_plen, buf);
} else {
fprintf(dump, "\t%s/%d\n",
inet6_n2p(&ifa->ifa_addr),
ifa->ifa_plen);
}
}
if (ifcp->ifc_filter) {
fprintf(dump, "\tFilter:");
for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
addr = 0;
switch (iffp->iff_type) {
case 'A':
ft = "Aggregate"; addr++; break;
case 'N':
ft = "No-use"; break;
case 'O':
ft = "Advertise-only"; addr++; break;
case 'T':
ft = "Default-only"; break;
case 'L':
ft = "Listen-only"; addr++; break;
default:
snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type);
ft = buf;
addr++;
break;
}
fprintf(dump, " %s", ft);
if (addr) {
fprintf(dump, "(%s/%d)", inet6_n2p(&iffp->iff_addr),
iffp->iff_plen);
}
}
fprintf(dump, "\n");
}
}

static void
rtdump(int sig)
{
struct riprt *rrt;
char buf[BUFSIZ];
FILE *dump;
time_t t, age;

if (sig == 0)
dump = stderr;
else
if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
dump = stderr;

t = time(NULL);
fprintf(dump, "\n%s: Routing Table Dump\n", hms());
for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
if (rrt->rrt_t == 0)
age = 0;
else
age = t - rrt->rrt_t;
inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest,
buf, sizeof(buf));
fprintf(dump, " %s/%d if(%d:%s) gw(%s) [%d] age(%ld)",
buf, rrt->rrt_info.rip6_plen, rrt->rrt_index,
index2ifc[rrt->rrt_index]->ifc_name,
inet6_n2p(&rrt->rrt_gw),
rrt->rrt_info.rip6_metric, (long)age);
if (rrt->rrt_info.rip6_tag) {
fprintf(dump, " tag(0x%04x)",
ntohs(rrt->rrt_info.rip6_tag) & 0xffff);
}
if (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)
fprintf(dump, " NOT-LL");
if (rrt->rrt_rflags & RRTF_NOADVERTISE)
fprintf(dump, " NO-ADV");
fprintf(dump, "\n");
}
fprintf(dump, "\n");
if (dump != stderr)
fclose(dump);
}

/*
* Parse the -A (and -O) options and put corresponding filter object to the
* specified interface structures. Each of the -A/O option has the following
* syntax: -A 5f09:c400::/32,ef0,ef1 (aggregate)
* -O 5f09:c400::/32,ef0,ef1 (only when match)
*/
static void
filterconfig(void)
{
int i;
char *p, *ap, *iflp, *ifname, *ep;
struct iff ftmp, *iff_obj;
struct ifc *ifcp;
struct riprt *rrt;
#if 0
struct in6_addr gw;
#endif
u_long plen;

for (i = 0; i < nfilter; i++) {
ap = filter[i];
iflp = NULL;
ifcp = NULL;
if (filtertype[i] == 'N' || filtertype[i] == 'T') {
iflp = ap;
goto ifonly;
}
if ((p = strchr(ap, ',')) != NULL) {
*p++ = '\0';
iflp = p;
}
if ((p = strchr(ap, '/')) == NULL) {
fatal("no prefixlen specified for '%s'", ap);
}
*p++ = '\0';
if (inet_pton(AF_INET6, ap, &ftmp.iff_addr) != 1) {
fatal("invalid prefix specified for '%s'", ap);
}
errno = 0;
ep = NULL;
plen = strtoul(p, &ep, 10);
if (errno || !*p || *ep || plen > sizeof(ftmp.iff_addr) * 8) {
fatal("invalid prefix length specified for '%s'", ap);
}
ftmp.iff_plen = plen;
ftmp.iff_next = NULL;
applyplen(&ftmp.iff_addr, ftmp.iff_plen);
ifonly:
ftmp.iff_type = filtertype[i];
if (iflp == NULL || *iflp == '\0') {
fatal("no interface specified for '%s'", ap);
}
/* parse the interface listing portion */
while (iflp) {
ifname = iflp;
if ((iflp = strchr(iflp, ',')) != NULL)
*iflp++ = '\0';
ifcp = ifc_find(ifname);
if (ifcp == NULL) {
fatal("no interface %s exists", ifname);
}
iff_obj = malloc(sizeof(struct iff));
if (iff_obj == NULL) {
fatal("malloc of iff_obj");
}
memcpy((void *)iff_obj, (void *)&ftmp,
sizeof(struct iff));
/* link it to the interface filter */
iff_obj->iff_next = ifcp->ifc_filter;
ifcp->ifc_filter = iff_obj;
}

/*
* -A: aggregate configuration.
*/
if (filtertype[i] != 'A')
continue;
/* put the aggregate to the kernel routing table */
rrt = malloc(sizeof(struct riprt));
if (rrt == NULL) {
fatal("malloc: rrt");
}
memset(rrt, 0, sizeof(struct riprt));
rrt->rrt_info.rip6_dest = ftmp.iff_addr;
rrt->rrt_info.rip6_plen = ftmp.iff_plen;
rrt->rrt_info.rip6_metric = 1;
rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
rrt->rrt_gw = in6addr_loopback;
rrt->rrt_flags = RTF_UP | RTF_REJECT;
rrt->rrt_rflags = RRTF_AGGREGATE;
rrt->rrt_t = 0;
rrt->rrt_index = loopifcp->ifc_index;
#if 0
if (getroute(&rrt->rrt_info, &gw)) {
#if 0
/*
* When the address has already been registered in the
* kernel routing table, it should be removed
*/
delroute(&rrt->rrt_info, &gw);
#else
/* it is safer behavior */
errno = EINVAL;
fatal("%s/%u already in routing table, "
"cannot aggregate",
inet6_n2p(&rrt->rrt_info.rip6_dest),
rrt->rrt_info.rip6_plen);
#endif
}
#endif
/* Put the route to the list */
rrt->rrt_next = riprt;
riprt = rrt;
trace(1, "Aggregate: %s/%d for %s\n",
inet6_n2p(&ftmp.iff_addr), ftmp.iff_plen,
ifcp->ifc_name);
/* Add this route to the kernel */
if (nflag) /* do not modify kernel routing table */
continue;
addroute(rrt, &in6addr_loopback, loopifcp);
}
}

/***************** utility functions *****************/

/*
* Returns a pointer to ifac whose address and prefix length matches
* with the address and prefix length specified in the arguments.
*/
static struct ifac *
ifa_match(const struct ifc *ifcp, const struct in6_addr *ia, int plen)
{
struct ifac *ifa;

for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
if (IN6_ARE_ADDR_EQUAL(&ifa->ifa_addr, ia) &&
ifa->ifa_plen == plen)
break;
}
return ifa;
}

/*
* Return a pointer to riprt structure whose address and prefix length
* matches with the address and prefix length found in the argument.
* Note: This is not a rtalloc(). Therefore exact match is necessary.
*/
static struct riprt *
rtsearch(struct netinfo6 *np, struct riprt **prev_rrt)
{
struct riprt *rrt;

if (prev_rrt)
*prev_rrt = NULL;
for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
if (rrt->rrt_info.rip6_plen == np->rip6_plen &&
IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
&np->rip6_dest))
return rrt;
if (prev_rrt)
*prev_rrt = rrt;
}
if (prev_rrt)
*prev_rrt = NULL;
return 0;
}

static int
sin6mask2len(const struct sockaddr_in6 *sin6)
{

return mask2len(&sin6->sin6_addr,
sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr));
}

static int
mask2len(const struct in6_addr *addr, int lenlim)
{
int i = 0, j;
const u_char *p = (const u_char *)addr;

for (j = 0; j < lenlim; j++, p++) {
if (*p != 0xff)
break;
i += 8;
}
if (j < lenlim) {
switch (*p) {
#define MASKLEN(m, l) case m: do { i += l; break; } while (0)
MASKLEN(0xfe, 7); break;
MASKLEN(0xfc, 6); break;
MASKLEN(0xf8, 5); break;
MASKLEN(0xf0, 4); break;
MASKLEN(0xe0, 3); break;
MASKLEN(0xc0, 2); break;
MASKLEN(0x80, 1); break;
#undef MASKLEN
}
}
return i;
}

static const u_char plent[8] = {
0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe
};

static void
applyplen(struct in6_addr *ia, int plen)
{
u_char *p;
int i;

p = ia->s6_addr;
for (i = 0; i < 16; i++) {
if (plen <= 0)
*p = 0;
else if (plen < 8)
*p &= plent[plen];
p++, plen -= 8;
}
}

static const int pl2m[9] = {
0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff
};

static struct in6_addr *
plen2mask(int n)
{
static struct in6_addr ia;
u_char *p;
int i;

memset(&ia, 0, sizeof(struct in6_addr));
p = (u_char *)&ia;
for (i = 0; i < 16; i++, p++, n -= 8) {
if (n >= 8) {
*p = 0xff;
continue;
}
*p = pl2m[n];
break;
}
return &ia;
}

static char *
xstrdup(char *p)
{
char *buf = strdup(p);
if (buf == NULL) {
fatal("strdup");
}
return buf;
}

static char *
hms(void)
{
static char buf[BUFSIZ];
time_t t;
struct tm *tm;

t = time(NULL);
if ((tm = localtime(&t)) == 0) {
fatal("localtime");
}
snprintf(buf, sizeof(buf), "%02d:%02d:%02d", tm->tm_hour, tm->tm_min,
tm->tm_sec);
return buf;
}

#define RIPRANDDEV 1.0 /* 30 +- 15, max - min = 30 */

static int
ripinterval(int timer)
{
double r = rand();

interval = (int)(timer + timer * RIPRANDDEV * (r / RAND_MAX - 0.5));
nextalarm = time(NULL) + interval;
return interval;
}

static void
fatal(const char *fmt, ...)
{
va_list ap;
char buf[1024];

va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
perror(buf);
if (errno)
syslog(LOG_ERR, "%s: %s", buf, strerror(errno));
else
syslog(LOG_ERR, "%s", buf);
rtdexit();
}

static void
tracet(int level, const char *fmt, ...)
{
va_list ap;

if (level <= dflag) {
va_start(ap, fmt);
fprintf(stderr, "%s: ", hms());
vfprintf(stderr, fmt, ap);
va_end(ap);
}
if (dflag) {
va_start(ap, fmt);
if (level > 0)
vsyslog(LOG_DEBUG, fmt, ap);
else
vsyslog(LOG_WARNING, fmt, ap);
va_end(ap);
}
}

static void
trace(int level, const char *fmt, ...)
{
va_list ap;

if (level <= dflag) {
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
}
if (dflag) {
va_start(ap, fmt);
if (level > 0)
vsyslog(LOG_DEBUG, fmt, ap);
else
vsyslog(LOG_WARNING, fmt, ap);
va_end(ap);
}
}

static struct ifc *
ifc_find(char *name)
{
struct ifc *ifcp;

for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
if (strcmp(name, ifcp->ifc_name) == 0)
return ifcp;
}
return NULL;
}

static struct iff *
iff_find(struct ifc *ifcp, int type)
{
struct iff *iffp;

for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
if (iffp->iff_type == type)
return iffp;
}
return NULL;
}

static void
setindex2ifc(int idx, struct ifc *ifcp)
{
int n, nsize;
struct ifc **p;

if (!index2ifc) {
nindex2ifc = 5; /*initial guess*/
index2ifc = malloc(sizeof(*index2ifc) * nindex2ifc);
if (index2ifc == NULL) {
fatal("malloc");
}
memset(index2ifc, 0, sizeof(*index2ifc) * nindex2ifc);
}
n = nindex2ifc;
for (nsize = nindex2ifc; nsize <= idx; nsize *= 2)
;
if (n != nsize) {
p = (struct ifc **)realloc(index2ifc,
sizeof(*index2ifc) * nsize);
if (p == NULL) {
fatal("realloc");
}
memset(p + n, 0, sizeof(*index2ifc) * (nindex2ifc - n));
index2ifc = p;
nindex2ifc = nsize;
}
index2ifc[idx] = ifcp;
}