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freebsd/usr.sbin/route6d/route6d.c
Gleb Smirnoff 56d5e0967c Stop including if_var.h from userland. 
Sponsored by:	Nginx, Inc.
2015-04-06 09:42:23 +00:00

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/* $FreeBSD$ */
/* $KAME: route6d.c,v 1.104 2003/10/31 00:30:20 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.
*/
#ifndef lint
static const char _rcsid[] = "$KAME: route6d.c,v 1.104 2003/10/31 00:30:20 itojun Exp $";
#endif
#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include <fnmatch.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#ifdef __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#include <syslog.h>
#include <stddef.h>
#include <errno.h>
#include <err.h>
#ifdef HAVE_POLL_H
#include <poll.h>
#endif
#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
#define RT_DUMP_MAXRETRY 15
#ifdef DEBUG
#define INIT_INTERVAL6 6
#else
#define INIT_INTERVAL6 10 /* Wait to submit an initial riprequest */
#endif
/* alignment constraint for routing socket */
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
struct ifc { /* Configuration of an interface */
TAILQ_ENTRY(ifc) ifc_next;
char ifc_name[IFNAMSIZ]; /* if name */
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 */
TAILQ_HEAD(, ifac) ifc_ifac_head; /* list of AF_INET6 addrs */
TAILQ_HEAD(, iff) ifc_iff_head; /* list of filters */
int ifc_joined; /* joined to ff02::9 */
};
TAILQ_HEAD(, ifc) ifc_head = TAILQ_HEAD_INITIALIZER(ifc_head);
struct ifac { /* Adddress associated to an interface */
TAILQ_ENTRY(ifac) ifac_next;
struct ifc *ifac_ifc; /* back pointer */
struct in6_addr ifac_addr; /* address */
struct in6_addr ifac_raddr; /* remote address, valid in p2p */
int ifac_scope_id; /* scope id */
int ifac_plen; /* prefix length */
};
struct iff { /* Filters for an interface */
TAILQ_ENTRY(iff) iff_next;
int iff_type;
struct in6_addr iff_addr;
int iff_plen;
};
struct ifc **index2ifc;
unsigned int nindex2ifc;
struct ifc *loopifcp = NULL; /* pointing to loopback */
#ifdef HAVE_POLL_H
struct pollfd set[2];
#else
fd_set *sockvecp; /* vector to select() for receiving */
fd_set *recvecp;
int fdmasks;
int maxfd; /* maximum fd for select() */
#endif
int rtsock; /* the routing socket */
int ripsock; /* socket to send/receive RIP datagram */
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 specifics covered by the aggregate.
*/
struct riprt {
TAILQ_ENTRY(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 */
};
TAILQ_HEAD(, riprt) riprt_head = TAILQ_HEAD_INITIALIZER(riprt_head);
int dflag = 0; /* debug flag */
int qflag = 0; /* quiet flag */
int nflag = 0; /* don't update kernel routing table */
int aflag = 0; /* age out even the statically defined routes */
int hflag = 0; /* don't split horizon */
int lflag = 0; /* exchange site local routes */
int Pflag = 0; /* don't age out routes with RTF_PROTO[123] */
int Qflag = RTF_PROTO2; /* set RTF_PROTO[123] flag to routes by RIPng */
int sflag = 0; /* announce static routes w/ split horizon */
int Sflag = 0; /* announce static routes to every interface */
unsigned long routetag = 0; /* route tag attached on originating case */
char *filter[MAXFILTER];
int filtertype[MAXFILTER];
int nfilter = 0;
pid_t pid;
struct sockaddr_storage ripsin;
int interval = 1;
time_t nextalarm = 0;
time_t sup_trig_update = 0;
FILE *rtlog = NULL;
int logopened = 0;
static int seq = 0;
volatile sig_atomic_t seenalrm;
volatile sig_atomic_t seenquit;
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
int main(int, char **);
void sighandler(int);
void ripalarm(void);
void riprecv(void);
void ripsend(struct ifc *, struct sockaddr_in6 *, int);
int out_filter(struct riprt *, struct ifc *);
void init(void);
void sockopt(struct ifc *);
void ifconfig(void);
int ifconfig1(const char *, const struct sockaddr *, struct ifc *, int);
void rtrecv(void);
int rt_del(const struct sockaddr_in6 *, const struct sockaddr_in6 *,
const struct sockaddr_in6 *);
int rt_deladdr(struct ifc *, const struct sockaddr_in6 *,
const struct sockaddr_in6 *);
void filterconfig(void);
int getifmtu(int);
const char *rttypes(struct rt_msghdr *);
const char *rtflags(struct rt_msghdr *);
const char *ifflags(int);
int ifrt(struct ifc *, int);
void ifrt_p2p(struct ifc *, int);
void applymask(struct in6_addr *, struct in6_addr *);
void applyplen(struct in6_addr *, int);
void ifrtdump(int);
void ifdump(int);
void ifdump0(FILE *, const struct ifc *);
void ifremove(int);
void rtdump(int);
void rt_entry(struct rt_msghdr *, int);
void rtdexit(void);
void riprequest(struct ifc *, struct netinfo6 *, int,
struct sockaddr_in6 *);
void ripflush(struct ifc *, struct sockaddr_in6 *, int, struct netinfo6 *np);
void sendrequest(struct ifc *);
int sin6mask2len(const struct sockaddr_in6 *);
int mask2len(const struct in6_addr *, int);
int sendpacket(struct sockaddr_in6 *, int);
int addroute(struct riprt *, const struct in6_addr *, struct ifc *);
int delroute(struct netinfo6 *, struct in6_addr *);
struct in6_addr *getroute(struct netinfo6 *, struct in6_addr *);
void krtread(int);
int tobeadv(struct riprt *, struct ifc *);
char *allocopy(char *);
char *hms(void);
const char *inet6_n2p(const struct in6_addr *);
struct ifac *ifa_match(const struct ifc *, const struct in6_addr *, int);
struct in6_addr *plen2mask(int);
struct riprt *rtsearch(struct netinfo6 *);
int ripinterval(int);
time_t ripsuptrig(void);
void fatal(const char *, ...)
__attribute__((__format__(__printf__, 1, 2)));
void trace(int, const char *, ...)
__attribute__((__format__(__printf__, 2, 3)));
void tracet(int, const char *, ...)
__attribute__((__format__(__printf__, 2, 3)));
unsigned int if_maxindex(void);
struct ifc *ifc_find(char *);
struct iff *iff_find(struct ifc *, int);
void setindex2ifc(int, struct ifc *);
#define MALLOC(type) ((type *)malloc(sizeof(type)))
#define IFIL_TYPE_ANY 0x0
#define IFIL_TYPE_A 'A'
#define IFIL_TYPE_N 'N'
#define IFIL_TYPE_T 'T'
#define IFIL_TYPE_O 'O'
#define IFIL_TYPE_L 'L'
int
main(int argc, char *argv[])
{
int ch;
int error = 0;
unsigned long proto;
struct ifc *ifcp;
sigset_t mask, omask;
const char *pidfile = ROUTE6D_PID;
FILE *pidfh;
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:adDhlnp:P:Q:qsS")) != -1) {
switch (ch) {
case 'A':
case 'N':
case 'O':
case 'T':
case 'L':
if (nfilter >= MAXFILTER) {
fatal("Exceeds MAXFILTER");
/*NOTREACHED*/
}
filtertype[nfilter] = ch;
filter[nfilter++] = allocopy(optarg);
break;
case 't':
ep = NULL;
routetag = strtoul(optarg, &ep, 0);
if (!ep || *ep != '\0' || (routetag & ~0xffff) != 0) {
fatal("invalid route tag");
/*NOTREACHED*/
}
break;
case 'p':
pidfile = optarg;
break;
case 'P':
ep = NULL;
proto = strtoul(optarg, &ep, 0);
if (!ep || *ep != '\0' || 3 < proto) {
fatal("invalid P flag");
/*NOTREACHED*/
}
if (proto == 0)
Pflag = 0;
if (proto == 1)
Pflag |= RTF_PROTO1;
if (proto == 2)
Pflag |= RTF_PROTO2;
if (proto == 3)
Pflag |= RTF_PROTO3;
break;
case 'Q':
ep = NULL;
proto = strtoul(optarg, &ep, 0);
if (!ep || *ep != '\0' || 3 < proto) {
fatal("invalid Q flag");
/*NOTREACHED*/
}
if (proto == 0)
Qflag = 0;
if (proto == 1)
Qflag |= RTF_PROTO1;
if (proto == 2)
Qflag |= RTF_PROTO2;
if (proto == 3)
Qflag |= RTF_PROTO3;
break;
case 'R':
if ((rtlog = fopen(optarg, "w")) == NULL) {
fatal("Can not write to routelog");
/*NOTREACHED*/
}
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");
/*NOTREACHED*/
}
}
argc -= optind;
argv += optind;
if (argc > 0) {
fatal("bogus extra arguments");
/*NOTREACHED*/
}
if (geteuid()) {
nflag = 1;
fprintf(stderr, "No kernel update is allowed\n");
}
if (dflag == 0) {
if (daemon(0, 0) < 0) {
fatal("daemon");
/*NOTREACHED*/
}
}
openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON);
logopened++;
if ((ripbuf = (struct rip6 *)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();
TAILQ_FOREACH(ifcp, &ifc_head, 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");
/*NOTREACHED*/
}
TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) {
ifrt(ifcp, 0);
}
filterconfig();
krtread(0);
if (dflag)
ifrtdump(0);
pid = getpid();
if ((pidfh = fopen(pidfile, "w")) != NULL) {
fprintf(pidfh, "%d\n", pid);
fclose(pidfh);
}
if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) {
fatal("malloc");
/*NOTREACHED*/
}
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");
/*NOTREACHED*/
}
/*
* 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));
TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) {
if (iff_find(ifcp, IFIL_TYPE_N) != NULL)
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;
}
#ifdef HAVE_POLL_H
switch (poll(set, 2, INFTIM))
#else
memcpy(recvecp, sockvecp, fdmasks);
switch (select(maxfd + 1, recvecp, 0, 0, 0))
#endif
{
case -1:
if (errno != EINTR) {
fatal("select");
/*NOTREACHED*/
}
continue;
case 0:
continue;
default:
#ifdef HAVE_POLL_H
if (set[0].revents & POLLIN)
#else
if (FD_ISSET(ripsock, recvecp))
#endif
{
sigprocmask(SIG_BLOCK, &mask, &omask);
riprecv();
sigprocmask(SIG_SETMASK, &omask, NULL);
}
#ifdef HAVE_POLL_H
if (set[1].revents & POLLIN)
#else
if (FD_ISSET(rtsock, recvecp))
#endif
{
sigprocmask(SIG_BLOCK, &mask, &omask);
rtrecv();
sigprocmask(SIG_SETMASK, &omask, NULL);
}
}
}
}
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 */
void
rtdexit(void)
{
struct riprt *rrt;
alarm(0);
TAILQ_FOREACH(rrt, &riprt_head, 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 */
void
ripalarm(void)
{
struct ifc *ifcp;
struct riprt *rrt, *rrt_tmp;
time_t t_lifetime, t_holddown;
/* age the RIP routes */
t_lifetime = time(NULL) - RIP_LIFETIME;
t_holddown = t_lifetime - RIP_HOLDDOWN;
TAILQ_FOREACH_SAFE(rrt, &riprt_head, rrt_next, rrt_tmp) {
if (rrt->rrt_t == 0)
continue;
else if (rrt->rrt_t < t_holddown) {
TAILQ_REMOVE(&riprt_head, rrt, rrt_next);
delroute(&rrt->rrt_info, &rrt->rrt_gw);
free(rrt);
} else if (rrt->rrt_t < t_lifetime)
rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
}
/* Supply updates */
TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) {
if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
ripsend(ifcp, &ifcp->ifc_ripsin, 0);
}
alarm(ripinterval(SUPPLY_INTERVAL6));
}
void
init(void)
{
int error;
const int int0 = 0, int1 = 1, int255 = 255;
struct addrinfo hints, *res;
char port[NI_MAXSERV];
TAILQ_INIT(&ifc_head);
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_protocol = IPPROTO_UDP;
hints.ai_flags = AI_PASSIVE;
error = getaddrinfo(NULL, port, &hints, &res);
if (error) {
fatal("%s", gai_strerror(error));
/*NOTREACHED*/
}
if (res->ai_next) {
fatal(":: resolved to multiple address");
/*NOTREACHED*/
}
ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (ripsock < 0) {
fatal("rip socket");
/*NOTREACHED*/
}
#ifdef IPV6_V6ONLY
if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_V6ONLY,
&int1, sizeof(int1)) < 0) {
fatal("rip IPV6_V6ONLY");
/*NOTREACHED*/
}
#endif
if (bind(ripsock, res->ai_addr, res->ai_addrlen) < 0) {
fatal("rip bind");
/*NOTREACHED*/
}
if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
&int255, sizeof(int255)) < 0) {
fatal("rip IPV6_MULTICAST_HOPS");
/*NOTREACHED*/
}
if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
&int0, sizeof(int0)) < 0) {
fatal("rip IPV6_MULTICAST_LOOP");
/*NOTREACHED*/
}
#ifdef IPV6_RECVPKTINFO
if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVPKTINFO,
&int1, sizeof(int1)) < 0) {
fatal("rip IPV6_RECVPKTINFO");
/*NOTREACHED*/
}
#else /* old adv. API */
if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_PKTINFO,
&int1, sizeof(int1)) < 0) {
fatal("rip IPV6_PKTINFO");
/*NOTREACHED*/
}
#endif
#ifdef IPV6_RECVPKTINFO
if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
&int1, sizeof(int1)) < 0) {
fatal("rip IPV6_RECVHOPLIMIT");
/*NOTREACHED*/
}
#else /* old adv. API */
if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_HOPLIMIT,
&int1, sizeof(int1)) < 0) {
fatal("rip IPV6_HOPLIMIT");
/*NOTREACHED*/
}
#endif
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_INET6;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
error = getaddrinfo(RIP6_DEST, port, &hints, &res);
if (error) {
fatal("%s", gai_strerror(error));
/*NOTREACHED*/
}
if (res->ai_next) {
fatal("%s resolved to multiple address", RIP6_DEST);
/*NOTREACHED*/
}
memcpy(&ripsin, res->ai_addr, res->ai_addrlen);
#ifdef HAVE_POLL_H
set[0].fd = ripsock;
set[0].events = POLLIN;
#else
maxfd = ripsock;
#endif
if (nflag == 0) {
if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
fatal("route socket");
/*NOTREACHED*/
}
#ifdef HAVE_POLL_H
set[1].fd = rtsock;
set[1].events = POLLIN;
#else
if (rtsock > maxfd)
maxfd = rtsock;
#endif
} else {
#ifdef HAVE_POLL_H
set[1].fd = -1;
#else
rtsock = -1; /*just for safety */
#endif
}
#ifndef HAVE_POLL_H
fdmasks = howmany(maxfd + 1, NFDBITS) * sizeof(fd_mask);
if ((sockvecp = malloc(fdmasks)) == NULL) {
fatal("malloc");
/*NOTREACHED*/
}
if ((recvecp = malloc(fdmasks)) == NULL) {
fatal("malloc");
/*NOTREACHED*/
}
memset(sockvecp, 0, fdmasks);
FD_SET(ripsock, sockvecp);
if (rtsock >= 0)
FD_SET(rtsock, sockvecp);
#endif
}
#define RIPSIZE(n) \
(sizeof(struct rip6) + ((n)-1) * sizeof(struct netinfo6))
/*
* ripflush flushes the rip datagram stored in the rip buffer
*/
void
ripflush(struct ifc *ifcp, struct sockaddr_in6 *sin6, int nrt, struct netinfo6 *np)
{
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) {
np = ripbuf->rip6_nets;
for (i = 0; i < nrt; i++, np++) {
if (np->rip6_metric == NEXTHOP_METRIC) {
if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest))
trace(2, " NextHop reset");
else {
trace(2, " NextHop %s",
inet6_n2p(&np->rip6_dest));
}
} else {
trace(2, " %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);
}
trace(2, "\n");
}
}
error = sendpacket(sin6, RIPSIZE(nrt));
if (error == EAFNOSUPPORT) {
/* 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 */
}
}
/*
* Generate RIP6_RESPONSE packets and send them.
*/
void
ripsend(struct ifc *ifcp, struct sockaddr_in6 *sin6, int flag)
{
struct riprt *rrt;
struct in6_addr *nh; /* next hop */
struct netinfo6 *np;
int maxrte;
int nrt;
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);
nh = NULL;
nrt = 0;
np = ripbuf->rip6_nets;
TAILQ_FOREACH(rrt, &riprt_head, rrt_next) {
if (rrt->rrt_rflags & RRTF_NOADVERTISE)
continue;
/* Put the route to the buffer */
*np = rrt->rrt_info;
np++; nrt++;
if (nrt == maxrte) {
ripflush(NULL, sin6, nrt, np);
nh = NULL;
nrt = 0;
np = ripbuf->rip6_nets;
}
}
if (nrt) /* Send last packet */
ripflush(NULL, sin6, nrt, np);
return;
}
if ((flag & RRTF_SENDANYWAY) == 0 &&
(qflag || (ifcp->ifc_flags & IFF_LOOPBACK)))
return;
/* -N: no use */
if (iff_find(ifcp, IFIL_TYPE_N) != NULL)
return;
/* -T: generate default route only */
if (iff_find(ifcp, IFIL_TYPE_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);
np = ripbuf->rip6_nets;
*np = rrt_info;
nrt = 1;
ripflush(ifcp, sin6, nrt, np);
return;
}
maxrte = (ifcp->ifc_mtu - sizeof(struct ip6_hdr) -
sizeof(struct udphdr) -
sizeof(struct rip6) + sizeof(struct netinfo6)) /
sizeof(struct netinfo6);
nrt = 0; np = ripbuf->rip6_nets; nh = NULL;
TAILQ_FOREACH(rrt, &riprt_head, 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, nrt, np);
nh = NULL;
nrt = 0;
np = ripbuf->rip6_nets;
}
np->rip6_dest = rrt->rrt_gw;
np->rip6_plen = 0;
np->rip6_tag = 0;
np->rip6_metric = NEXTHOP_METRIC;
nh = &rrt->rrt_gw;
np++; 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, nrt, np);
nh = NULL;
nrt = 0;
np = ripbuf->rip6_nets;
}
memset(np, 0, sizeof(struct netinfo6));
np->rip6_metric = NEXTHOP_METRIC;
nh = NULL;
np++; nrt++;
}
/* Put the route to the buffer */
*np = rrt->rrt_info;
np++; nrt++;
if (nrt == maxrte) {
ripflush(ifcp, sin6, nrt, np);
nh = NULL;
nrt = 0;
np = ripbuf->rip6_nets;
}
}
if (nrt) /* Send last packet */
ripflush(ifcp, sin6, nrt, np);
}
/*
* outbound filter logic, per-route/interface.
*/
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.
*/
TAILQ_FOREACH(iffp, &ifcp->ifc_iff_head, 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;
TAILQ_FOREACH(iffp, &ifcp->ifc_iff_head, 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, IFIL_TYPE_O) != NULL) {
ok = 0;
TAILQ_FOREACH(iffp, &ifcp->ifc_iff_head, 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.
*/
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.
*/
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))
idx = sin6->sin6_scope_id;
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.
*/
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 = NULL;
int *hlimp = NULL;
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");
/*NOTREACHED*/
}
idx = 0;
for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m);
cm;
cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) {
if (cm->cmsg_level != IPPROTO_IPV6)
continue;
switch (cm->cmsg_type) {
case IPV6_PKTINFO:
if (cm->cmsg_len != CMSG_LEN(sizeof(*pi))) {
trace(1,
"invalid cmsg length for IPV6_PKTINFO\n");
return;
}
pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
idx = pi->ipi6_ifindex;
break;
case IPV6_HOPLIMIT:
if (cm->cmsg_len != CMSG_LEN(sizeof(int))) {
trace(1,
"invalid cmsg length for IPV6_HOPLIMIT\n");
return;
}
hlimp = (int *)CMSG_DATA(cm);
break;
}
}
if ((size_t)len < sizeof(struct rip6)) {
trace(1, "Packet too short\n");
return;
}
if (pi == NULL || hlimp == NULL) {
/*
* This can happen when the kernel failed to allocate memory
* for the ancillary data. Although we might be able to handle
* some cases without this info, those are minor and not so
* important, so it's better to discard the packet for safer
* operation.
*/
trace(1, "IPv6 packet information cannot be retrieved\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 < 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, "Response from non-ll addr: %s\n",
inet6_n2p(&fsock.sin6_addr));
return; /* Ignore packets from non-link-local addr */
}
if (ntohs(fsock.sin6_port) != RIP6_PORT) {
trace(1, "Response from non-rip port from %s\n",
inet6_n2p(&fsock.sin6_addr));
return;
}
if (IN6_IS_ADDR_MULTICAST(&pi->ipi6_addr) && *hlimp != 255) {
trace(1,
"Response packet with a smaller hop limit (%d) from %s\n",
*hlimp, inet6_n2p(&fsock.sin6_addr));
return;
}
/*
* Further validation: since this program does not send off-link
* requests, an incoming response must always come from an on-link
* node. Although this is normally ensured by the source address
* check above, it may not 100% be safe because there are router
* implementations that (invalidly) allow a packet with a link-local
* source address to be forwarded to a different link.
* So we also check whether the destination address is a link-local
* address or the hop limit is 255. Note that RFC2080 does not require
* the specific hop limit for a unicast response, so we cannot assume
* the limitation.
*/
if (!IN6_IS_ADDR_LINKLOCAL(&pi->ipi6_addr) && *hlimp != 255) {
trace(1,
"Response packet possibly from an off-link node: "
"from %s to %s hlim=%d\n",
inet6_n2p(&fsock.sin6_addr),
inet6_n2p(&pi->ipi6_addr), *hlimp);
return;
}
idx = fsock.sin6_scope_id;
ifcp = (idx < 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, IFIL_TYPE_N) != NULL)
return;
tracet(1, "Recv(%s): from %s.%d info(%zd)\n",
ifcp->ifc_name, inet6_n2p(&nh), ntohs(fsock.sin6_port), 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;
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 */
TAILQ_FOREACH(iffp, &ifcp->ifc_iff_head, iff_next) {
if (iffp->iff_type != IFIL_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) {
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");
/*NOTREACHED*/
}
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;
/* Update routing table */
addroute(rrt, &nh, ifcp);
rrt->rrt_rflags |= RRTF_CHANGED;
need_trigger = 1;
rrt->rrt_t = t;
/* Put the route to the list */
TAILQ_INSERT_HEAD(&riprt_head, rrt, rrt_next);
}
}
/* XXX need to care the interval between triggered updates */
if (need_trigger) {
if (nextalarm > time(NULL) + RIP_TRIG_INT6_MAX) {
TAILQ_FOREACH(ic, &ifc_head, 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 */
TAILQ_FOREACH(rrt, &riprt_head, rrt_next) {
rrt->rrt_rflags &= ~RRTF_CHANGED;
}
}
}
/*
* Send all routes request packet to the specified interface.
*/
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.
*/
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);
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.
*/
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");
/*NOTREACHED*/
}
if (getifaddrs(&ifap) != 0) {
fatal("getifaddrs");
/*NOTREACHED*/
}
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");
/*NOTREACHED*/
}
memset(ifcp, 0, sizeof(*ifcp));
ifcp->ifc_index = -1;
strlcpy(ifcp->ifc_name, ifa->ifa_name,
sizeof(ifcp->ifc_name));
TAILQ_INIT(&ifcp->ifc_ifac_head);
TAILQ_INIT(&ifcp->ifc_iff_head);
ifcp->ifc_flags = ifa->ifa_flags;
TAILQ_INSERT_HEAD(&ifc_head, ifcp, ifc_next);
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;
}
if (ifconfig1(ifa->ifa_name, ifa->ifa_addr, ifcp, s) < 0) {
/* maybe temporary failure */
continue;
}
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");
/*NOTREACHED*/
}
trace(1, "join %s %s\n", ifcp->ifc_name, RIP6_DEST);
ifcp->ifc_joined++;
}
}
close(s);
freeifaddrs(ifap);
}
int
ifconfig1(const char *name,
const struct sockaddr *sa,
struct ifc *ifcp,
int s)
{
struct in6_ifreq ifr;
const struct sockaddr_in6 *sin6;
struct ifac *ifac;
int plen;
char buf[BUFSIZ];
sin6 = (const struct sockaddr_in6 *)sa;
if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) && !lflag)
return (-1);
ifr.ifr_addr = *sin6;
strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
if (ioctl(s, SIOCGIFNETMASK_IN6, (char *)&ifr) < 0) {
syslog(LOG_INFO, "ioctl: SIOCGIFNETMASK_IN6");
return (-1);
}
plen = sin6mask2len(&ifr.ifr_addr);
if ((ifac = ifa_match(ifcp, &sin6->sin6_addr, plen)) != NULL) {
/* same interface found */
/* need check if something changed */
/* XXX not yet implemented */
return (-1);
}
/*
* New address is found
*/
if ((ifac = MALLOC(struct ifac)) == NULL) {
fatal("malloc: struct ifac");
/*NOTREACHED*/
}
memset(ifac, 0, sizeof(*ifac));
ifac->ifac_ifc = ifcp;
ifac->ifac_addr = sin6->sin6_addr;
ifac->ifac_plen = plen;
ifac->ifac_scope_id = sin6->sin6_scope_id;
if (ifcp->ifc_flags & IFF_POINTOPOINT) {
ifr.ifr_addr = *sin6;
if (ioctl(s, SIOCGIFDSTADDR_IN6, (char *)&ifr) < 0) {
fatal("ioctl: SIOCGIFDSTADDR_IN6");
/*NOTREACHED*/
}
ifac->ifac_raddr = ifr.ifr_dstaddr.sin6_addr;
inet_ntop(AF_INET6, (void *)&ifac->ifac_raddr, buf,
sizeof(buf));
trace(1, "found address %s/%d -- %s\n",
inet6_n2p(&ifac->ifac_addr), ifac->ifac_plen, buf);
} else {
trace(1, "found address %s/%d\n",
inet6_n2p(&ifac->ifac_addr), ifac->ifac_plen);
}
if (ifcp->ifc_index < 0 && IN6_IS_ADDR_LINKLOCAL(&ifac->ifac_addr)) {
ifcp->ifc_mylladdr = ifac->ifac_addr;
ifcp->ifc_index = ifac->ifac_scope_id;
memcpy(&ifcp->ifc_ripsin, &ripsin, ripsin.ss_len);
ifcp->ifc_ripsin.sin6_scope_id = 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");
/*NOTREACHED*/
}
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;
TAILQ_INSERT_HEAD(&ifcp->ifc_ifac_head, ifac, ifac_next);
return 0;
}
void
ifremove(int ifindex)
{
struct ifc *ifcp;
struct riprt *rrt;
TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) {
if (ifcp->ifc_index == ifindex)
break;
}
if (ifcp == NULL)
return;
tracet(1, "ifremove: %s is departed.\n", ifcp->ifc_name);
TAILQ_REMOVE(&ifc_head, ifcp, ifc_next);
TAILQ_FOREACH(rrt, &riprt_head, rrt_next) {
if (rrt->rrt_index == ifcp->ifc_index &&
rrt->rrt_rflags & RRTF_AGGREGATE)
delroute(&rrt->rrt_info, &rrt->rrt_gw);
}
free(ifcp);
}
/*
* Receive and process routing messages.
* Update interface information as necesssary.
*/
void
rtrecv(void)
{
char buf[BUFSIZ];
char *p, *q = NULL;
struct rt_msghdr *rtm;
struct ifa_msghdr *ifam;
struct if_msghdr *ifm;
struct if_announcemsghdr *ifan;
int len;
struct ifc *ifcp, *ic;
int iface = 0, rtable = 0;
struct sockaddr_in6 *rta[RTAX_MAX];
struct sockaddr_in6 mask;
int i, addrs = 0;
struct riprt *rrt;
if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
perror("read from rtsock");
exit(1);
}
if (len == 0)
return;
#if 0
if (len < sizeof(*rtm)) {
trace(1, "short read from rtsock: %d (should be > %lu)\n",
len, (u_long)sizeof(*rtm));
return;
}
#endif
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) {
if (((struct rt_msghdr *)p)->rtm_version != RTM_VERSION)
continue;
/* 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;
case RTM_IFANNOUNCE:
ifan = (struct if_announcemsghdr *)p;
switch (ifan->ifan_what) {
case IFAN_ARRIVAL:
iface++;
break;
case IFAN_DEPARTURE:
ifremove(ifan->ifan_index);
iface++;
break;
}
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;
}
}
if (iface) {
trace(1, "rtsock: reconfigure interfaces, refresh interface routes\n");
ifconfig();
TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) {
if (ifcp->ifc_cflags & IFC_CHANGED) {
if (ifrt(ifcp, 1)) {
TAILQ_FOREACH(ic, &ifc_head, 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 */
TAILQ_FOREACH(rrt, &riprt_head, 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.
*/
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;
TAILQ_FOREACH(rrt, &riprt_head, 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) {
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.
*/
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 *ifac = 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);
ifac = ifa_match(ifcp, addr, prefix);
if (!ifac) {
trace(1, "\tno matching ifa found for %s/%d on %s\n",
inet6_n2p(addr), prefix, ifcp->ifc_name);
return -1;
}
if (ifac->ifac_ifc != ifcp) {
trace(1, "\taddress table corrupt: back pointer does not match "
"(%s != %s)\n",
ifcp->ifc_name, ifac->ifac_ifc->ifc_name);
return -1;
}
TAILQ_REMOVE(&ifcp->ifc_ifac_head, ifac, ifac_next);
t_lifetime = time(NULL) - RIP_LIFETIME;
/* age route for interface address */
memset(&ni6, 0, sizeof(ni6));
ni6.rip6_dest = ifac->ifac_addr;
ni6.rip6_plen = ifac->ifac_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) {
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 = ifac->ifac_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) {
if (rrt->rrt_index == ifcp->ifc_index &&
IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw,
&ifac->ifac_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");
}
free(ifac);
return ((updated) ? 0 : -1);
}
/*
* Get each interface address and put those interface routes to the route
* list.
*/
int
ifrt(struct ifc *ifcp, int again)
{
struct ifac *ifac;
struct riprt *rrt = NULL, *search_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;
}
TAILQ_FOREACH(ifac, &ifcp->ifc_ifac_head, ifac_next) {
if (IN6_IS_ADDR_LINKLOCAL(&ifac->ifac_addr)) {
#if 0
trace(1, "route: %s on %s: "
"skip linklocal interface address\n",
inet6_n2p(&ifac->ifac_addr), ifcp->ifc_name);
#endif
continue;
}
if (IN6_IS_ADDR_UNSPECIFIED(&ifac->ifac_addr)) {
#if 0
trace(1, "route: %s: skip unspec interface address\n",
ifcp->ifc_name);
#endif
continue;
}
if (IN6_IS_ADDR_LOOPBACK(&ifac->ifac_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 = ifac->ifac_addr;
rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
rrt->rrt_info.rip6_plen = ifac->ifac_plen;
rrt->rrt_flags = RTF_HOST;
rrt->rrt_rflags |= RRTF_CHANGED;
applyplen(&rrt->rrt_info.rip6_dest, ifac->ifac_plen);
memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
rrt->rrt_gw = ifac->ifac_addr;
np = &rrt->rrt_info;
search_rrt = rtsearch(np);
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;
}
TAILQ_REMOVE(&riprt_head, 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);
TAILQ_INSERT_HEAD(&riprt_head, rrt, rrt_next);
addroute(rrt, &rrt->rrt_gw, ifcp);
rrt = NULL;
sendrequest(ifcp);
ripsend(ifcp, &ifcp->ifc_ripsin, 0);
need_trigger = 1;
} else {
TAILQ_FOREACH(loop_rrt, &riprt_head, 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.
*/
void
ifrt_p2p(struct ifc *ifcp, int again)
{
struct ifac *ifac;
struct riprt *rrt, *orrt;
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
const enum { CISCO, GATED, ROUTE6D } behavior = GATED;
const char *category = "";
const char *noadv;
TAILQ_FOREACH(ifac, &ifcp->ifc_ifac_head, ifac_next) {
addr = ifac->ifac_addr;
dest = ifac->ifac_raddr;
applyplen(&addr, ifac->ifac_plen);
applyplen(&dest, ifac->ifac_plen);
advert = ignore = 0;
switch (behavior) {
case 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;
break;
case 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;
break;
case 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(&ifac->ifac_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;
break;
}
for (i = 1; i <= P2PADVERT_MAX; i *= 2) {
if ((ignore & i) != 0)
continue;
if ((rrt = MALLOC(struct riprt)) == NULL) {
fatal("malloc: struct riprt");
/*NOTREACHED*/
}
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 = ifac->ifac_addr;
rrt->rrt_info.rip6_plen = ifac->ifac_plen;
applyplen(&rrt->rrt_info.rip6_dest,
ifac->ifac_plen);
category = "network";
break;
case P2PADVERT_ADDR:
rrt->rrt_info.rip6_dest = ifac->ifac_addr;
rrt->rrt_info.rip6_plen = 128;
rrt->rrt_gw = in6addr_loopback;
category = "addr";
break;
case P2PADVERT_DEST:
rrt->rrt_info.rip6_dest = ifac->ifac_raddr;
rrt->rrt_info.rip6_plen = 128;
rrt->rrt_gw = ifac->ifac_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);
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);
TAILQ_INSERT_HEAD(&riprt_head, rrt, rrt_next);
} else if (rrt->rrt_index != orrt->rrt_index ||
rrt->rrt_info.rip6_metric != orrt->rrt_info.rip6_metric) {
/* replace route */
TAILQ_INSERT_BEFORE(orrt, rrt, rrt_next);
TAILQ_REMOVE(&riprt_head, orrt, rrt_next);
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
}
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");
/*NOTREACHED*/
}
if ((buf = malloc(msize)) == NULL) {
fatal("malloc");
/*NOTREACHED*/
}
if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) {
fatal("sysctl NET_RT_IFLIST");
/*NOTREACHED*/
}
ifm = (struct if_msghdr *)buf;
mtu = ifm->ifm_data.ifi_mtu;
if (ifindex != ifm->ifm_index) {
fatal("ifindex does not match with ifm_index");
/*NOTREACHED*/
}
free(buf);
return mtu;
}
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("NEWADDR", RTM_NEWADDR);
RTTYPE("DELADDR", RTM_DELADDR);
RTTYPE("IFINFO", RTM_IFINFO);
#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;
}
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
#ifdef RTF_CLONED
RTFLAG("c", RTF_CLONED);
#endif
RTFLAG("X", RTF_XRESOLVE);
#ifdef RTF_LLINFO
RTFLAG("L", RTF_LLINFO);
#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;
}
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_NOTRAILERS
IFFLAG("NOTRAILERS", IFF_NOTRAILERS);
#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;
}
void
krtread(int again)
{
int mib[6];
size_t msize;
char *buf, *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 {
if (retry)
sleep(1);
retry++;
errmsg = NULL;
if (buf)
free(buf);
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 < RT_DUMP_MAXRETRY && errmsg != NULL);
if (errmsg) {
fatal("%s (with %d retries, msize=%lu)", errmsg, retry,
(u_long)msize);
/*NOTREACHED*/
} else if (1 < retry)
syslog(LOG_INFO, "NET_RT_DUMP %d retires", retry);
lim = buf + msize;
for (p = buf; p < lim; p += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)p;
rt_entry(rtm, again);
}
free(buf);
}
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 ifindex;
sin6_dst = sin6_gw = sin6_mask = sin6_genmask = sin6_ifp = 0;
if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags &
(RTF_XRESOLVE|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
/* XXX: Ignore connected routes. */
if (!(rtm->rtm_flags & (RTF_GATEWAY|RTF_HOST|RTF_STATIC)))
return;
/*
* 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");
/*NOTREACHED*/
}
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 & Pflag)
rrt->rrt_t = 0; /* Don't age PROTO[123] 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);
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 */
ifindex = rtm->rtm_index;
if ((unsigned int)ifindex < nindex2ifc && index2ifc[ifindex])
ifname = index2ifc[ifindex]->ifc_name;
else {
trace(1, " not configured\n");
free(rrt);
return;
}
trace(1, " if %s sock %d", ifname, ifindex);
rrt->rrt_index = ifindex;
trace(1, "\n");
/* Check gateway */
if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) &&
!IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw) &&
(rrt->rrt_flags & RTF_LOCAL) == 0) {
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 */
TAILQ_INSERT_BEFORE(orrt, rrt, rrt_next);
TAILQ_REMOVE(&riprt_head, orrt, rrt_next);
trace(1, "route: %s/%d flags %s: replace new route\n",
inet6_n2p(&np->rip6_dest), np->rip6_plen,
rtflags(rtm));
free(orrt);
} else
TAILQ_INSERT_HEAD(&riprt_head, rrt, rrt_next);
}
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_flags |= Qflag;
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;
if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
sin6->sin6_scope_id = ifcp->ifc_index;
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;
}
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;
rtm->rtm_flags |= Qflag;
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;
}
struct in6_addr *
getroute(struct netinfo6 *np, struct in6_addr *gw)
{
u_char buf[BUFSIZ];
int myseq;
int len;
struct rt_msghdr *rtm;
struct sockaddr_in6 *sin6;
rtm = (struct rt_msghdr *)buf;
len = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in6);
memset(rtm, 0, len);
rtm->rtm_type = RTM_GET;
rtm->rtm_version = RTM_VERSION;
myseq = ++seq;
rtm->rtm_seq = myseq;
rtm->rtm_addrs = RTA_DST;
rtm->rtm_msglen = len;
sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
sin6->sin6_len = sizeof(struct sockaddr_in6);
sin6->sin6_family = AF_INET6;
sin6->sin6_addr = np->rip6_dest;
if (write(rtsock, buf, len) < 0) {
if (errno == ESRCH) /* No such route found */
return NULL;
perror("write to rtsock");
exit(1);
}
do {
if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
perror("read from rtsock");
exit(1);
}
rtm = (struct rt_msghdr *)buf;
} while (rtm->rtm_seq != myseq || rtm->rtm_pid != pid);
sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
if (rtm->rtm_addrs & RTA_DST) {
sin6 = (struct sockaddr_in6 *)
((char *)sin6 + ROUNDUP(sin6->sin6_len));
}
if (rtm->rtm_addrs & RTA_GATEWAY) {
*gw = sin6->sin6_addr;
return gw;
}
return NULL;
}
const char *
inet6_n2p(const struct in6_addr *p)
{
static char buf[BUFSIZ];
return inet_ntop(AF_INET6, (const void *)p, buf, sizeof(buf));
}
void
ifrtdump(int sig)
{
ifdump(sig);
rtdump(sig);
}
void
ifdump(int sig)
{
struct ifc *ifcp;
FILE *dump;
int nifc = 0;
if (sig == 0)
dump = stderr;
else
if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
dump = stderr;
fprintf(dump, "%s: Interface Table Dump\n", hms());
TAILQ_FOREACH(ifcp, &ifc_head, ifc_next)
nifc++;
fprintf(dump, " Number of interfaces: %d\n", nifc);
fprintf(dump, " advertising interfaces:\n");
TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) {
if ((ifcp->ifc_flags & IFF_UP) == 0)
continue;
if (iff_find(ifcp, IFIL_TYPE_N) != NULL)
continue;
ifdump0(dump, ifcp);
}
fprintf(dump, "\n");
fprintf(dump, " non-advertising interfaces:\n");
TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) {
if ((ifcp->ifc_flags & IFF_UP) &&
(iff_find(ifcp, IFIL_TYPE_N) == NULL))
continue;
ifdump0(dump, ifcp);
}
fprintf(dump, "\n");
if (dump != stderr)
fclose(dump);
}
void
ifdump0(FILE *dump, const struct ifc *ifcp)
{
struct ifac *ifac;
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);
TAILQ_FOREACH(ifac, &ifcp->ifc_ifac_head, ifac_next) {
if (ifcp->ifc_flags & IFF_POINTOPOINT) {
inet_ntop(AF_INET6, (void *)&ifac->ifac_raddr,
buf, sizeof(buf));
fprintf(dump, "\t%s/%d -- %s\n",
inet6_n2p(&ifac->ifac_addr),
ifac->ifac_plen, buf);
} else {
fprintf(dump, "\t%s/%d\n",
inet6_n2p(&ifac->ifac_addr),
ifac->ifac_plen);
}
}
fprintf(dump, "\tFilter:\n");
TAILQ_FOREACH(iffp, &ifcp->ifc_iff_head, iff_next) {
addr = 0;
switch (iffp->iff_type) {
case IFIL_TYPE_A:
ft = "Aggregate"; addr++; break;
case IFIL_TYPE_N:
ft = "No-use"; break;
case IFIL_TYPE_O:
ft = "Advertise-only"; addr++; break;
case IFIL_TYPE_T:
ft = "Default-only"; break;
case IFIL_TYPE_L:
ft = "Listen-only"; addr++; break;
default:
snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type);
ft = buf;
addr++;
break;
}
fprintf(dump, "\t\t%s", ft);
if (addr)
fprintf(dump, "(%s/%d)", inet6_n2p(&iffp->iff_addr),
iffp->iff_plen);
fprintf(dump, "\n");
}
fprintf(dump, "\n");
}
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());
TAILQ_FOREACH(rrt, &riprt_head, 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)
*/
void
filterconfig(void)
{
int i;
char *p, *ap, *iflp, *ifname, *ep;
struct iff iff, *iffp;
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;
iffp = &iff;
memset(iffp, 0, sizeof(*iffp));
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);
/*NOTREACHED*/
}
*p++ = '\0';
if (inet_pton(AF_INET6, ap, &iffp->iff_addr) != 1) {
fatal("invalid prefix specified for '%s'", ap);
/*NOTREACHED*/
}
errno = 0;
ep = NULL;
plen = strtoul(p, &ep, 10);
if (errno || !*p || *ep || plen > sizeof(iffp->iff_addr) * 8) {
fatal("invalid prefix length specified for '%s'", ap);
/*NOTREACHED*/
}
iffp->iff_plen = plen;
applyplen(&iffp->iff_addr, iffp->iff_plen);
ifonly:
iffp->iff_type = filtertype[i];
if (iflp == NULL || *iflp == '\0') {
fatal("no interface specified for '%s'", ap);
/*NOTREACHED*/
}
/* parse the interface listing portion */
while (iflp) {
ifname = iflp;
if ((iflp = strchr(iflp, ',')) != NULL)
*iflp++ = '\0';
TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) {
if (fnmatch(ifname, ifcp->ifc_name, 0) != 0)
continue;
iffp = malloc(sizeof(*iffp));
if (iffp == NULL) {
fatal("malloc of iff");
/*NOTREACHED*/
}
memcpy(iffp, &iff, sizeof(*iffp));
#if 0
syslog(LOG_INFO, "Add filter: type %d, ifname %s.", iffp->iff_type, ifname);
#endif
TAILQ_INSERT_HEAD(&ifcp->ifc_iff_head, iffp, iff_next);
}
}
/*
* -A: aggregate configuration.
*/
if (filtertype[i] != IFIL_TYPE_A)
continue;
/* put the aggregate to the kernel routing table */
rrt = (struct riprt *)malloc(sizeof(struct riprt));
if (rrt == NULL) {
fatal("malloc: rrt");
/*NOTREACHED*/
}
memset(rrt, 0, sizeof(struct riprt));
rrt->rrt_info.rip6_dest = iff.iff_addr;
rrt->rrt_info.rip6_plen = iff.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);
/*NOTREACHED*/
#endif
}
#endif
/* Put the route to the list */
TAILQ_INSERT_HEAD(&riprt_head, rrt, rrt_next);
trace(1, "Aggregate: %s/%d for %s\n",
inet6_n2p(&iff.iff_addr), iff.iff_plen,
loopifcp->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.
*/
struct ifac *
ifa_match(const struct ifc *ifcp,
const struct in6_addr *ia,
int plen)
{
struct ifac *ifac;
TAILQ_FOREACH(ifac, &ifcp->ifc_ifac_head, ifac_next) {
if (IN6_ARE_ADDR_EQUAL(&ifac->ifac_addr, ia) &&
ifac->ifac_plen == plen)
break;
}
return (ifac);
}
/*
* 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.
*/
struct riprt *
rtsearch(struct netinfo6 *np)
{
struct riprt *rrt;
TAILQ_FOREACH(rrt, &riprt_head, rrt_next) {
if (rrt->rrt_info.rip6_plen == np->rip6_plen &&
IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
&np->rip6_dest))
break;
}
return (rrt);
}
int
sin6mask2len(const struct sockaddr_in6 *sin6)
{
return mask2len(&sin6->sin6_addr,
sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr));
}
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;
}
void
applymask(struct in6_addr *addr, struct in6_addr *mask)
{
int i;
u_long *p, *q;
p = (u_long *)addr; q = (u_long *)mask;
for (i = 0; i < 4; i++)
*p++ &= *q++;
}
static const u_char plent[8] = {
0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe
};
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
};
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;
}
char *
allocopy(char *p)
{
int len = strlen(p) + 1;
char *q = (char *)malloc(len);
if (!q) {
fatal("malloc");
/*NOTREACHED*/
}
strlcpy(q, p, len);
return q;
}
char *
hms(void)
{
static char buf[BUFSIZ];
time_t t;
struct tm *tm;
t = time(NULL);
if ((tm = localtime(&t)) == 0) {
fatal("localtime");
/*NOTREACHED*/
}
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 */
int
ripinterval(int timer)
{
double r = rand();
interval = (int)(timer + timer * RIPRANDDEV * (r / RAND_MAX - 0.5));
nextalarm = time(NULL) + interval;
return interval;
}
time_t
ripsuptrig(void)
{
time_t t;
double r = rand();
t = (int)(RIP_TRIG_INT6_MIN +
(RIP_TRIG_INT6_MAX - RIP_TRIG_INT6_MIN) * (r / RAND_MAX));
sup_trig_update = time(NULL) + t;
return t;
}
void
#ifdef __STDC__
fatal(const char *fmt, ...)
#else
fatal(fmt, va_alist)
char *fmt;
va_dcl
#endif
{
va_list ap;
char buf[1024];
#ifdef __STDC__
va_start(ap, fmt);
#else
va_start(ap);
#endif
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();
}
void
#ifdef __STDC__
tracet(int level, const char *fmt, ...)
#else
tracet(level, fmt, va_alist)
int level;
char *fmt;
va_dcl
#endif
{
va_list ap;
if (level <= dflag) {
#ifdef __STDC__
va_start(ap, fmt);
#else
va_start(ap);
#endif
fprintf(stderr, "%s: ", hms());
vfprintf(stderr, fmt, ap);
va_end(ap);
}
if (dflag) {
#ifdef __STDC__
va_start(ap, fmt);
#else
va_start(ap);
#endif
if (level > 0)
vsyslog(LOG_DEBUG, fmt, ap);
else
vsyslog(LOG_WARNING, fmt, ap);
va_end(ap);
}
}
void
#ifdef __STDC__
trace(int level, const char *fmt, ...)
#else
trace(level, fmt, va_alist)
int level;
char *fmt;
va_dcl
#endif
{
va_list ap;
if (level <= dflag) {
#ifdef __STDC__
va_start(ap, fmt);
#else
va_start(ap);
#endif
vfprintf(stderr, fmt, ap);
va_end(ap);
}
if (dflag) {
#ifdef __STDC__
va_start(ap, fmt);
#else
va_start(ap);
#endif
if (level > 0)
vsyslog(LOG_DEBUG, fmt, ap);
else
vsyslog(LOG_WARNING, fmt, ap);
va_end(ap);
}
}
unsigned int
if_maxindex(void)
{
struct if_nameindex *p, *p0;
unsigned int max = 0;
p0 = if_nameindex();
for (p = p0; p && p->if_index && p->if_name; p++) {
if (max < p->if_index)
max = p->if_index;
}
if_freenameindex(p0);
return max;
}
struct ifc *
ifc_find(char *name)
{
struct ifc *ifcp;
TAILQ_FOREACH(ifcp, &ifc_head, ifc_next) {
if (strcmp(name, ifcp->ifc_name) == 0)
break;
}
return (ifcp);
}
struct iff *
iff_find(struct ifc *ifcp, int type)
{
struct iff *iffp;
TAILQ_FOREACH(iffp, &ifcp->ifc_iff_head, iff_next) {
if (type == IFIL_TYPE_ANY ||
type == iffp->iff_type)
break;
}
return (iffp);
}
void
setindex2ifc(int idx, struct ifc *ifcp)
{
int n, nsize;
struct ifc **p;
if (!index2ifc) {
nindex2ifc = 5; /*initial guess*/
index2ifc = (struct ifc **)
malloc(sizeof(*index2ifc) * nindex2ifc);
if (index2ifc == NULL) {
fatal("malloc");
/*NOTREACHED*/
}
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");
/*NOTREACHED*/
}
memset(p + n, 0, sizeof(*index2ifc) * (nindex2ifc - n));
index2ifc = p;
nindex2ifc = nsize;
}
index2ifc[idx] = ifcp;
}
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