/
route6d.c
3149 lines (2945 loc) · 77.9 KB
/
route6d.c
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/* $KAME: route6d.c,v 1.34 2000/07/30 17:24:40 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 char _rcsid[] = "$KAME: route6d.c,v 1.34 2000/07/30 17:24:40 itojun Exp $";
#endif
#include <stdio.h>
#include <time.h>
#include <unistd.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>
#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>
#if defined(__FreeBSD__) && __FreeBSD__ >= 3
#include <net/if_var.h>
#endif /* __FreeBSD__ >= 3 */
#define KERNEL 1
#define _KERNEL 1
#include <net/route.h>
#undef KERNEL
#undef _KERNEL
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip6.h>
#include <netinet/udp.h>
#include <netdb.h>
#ifdef HAVE_GETIFADDRS
#include <ifaddrs.h>
#endif
#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 */
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
/*
* 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 */
short ifc_flags; /* flags */
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 { /* Adddress 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;
};
struct ifc *ifc;
int nifc; /* number of valid ifc's */
struct ifc **index2ifc;
int nindex2ifc;
struct ifc *loopifcp = NULL; /* pointing to loopback */
int loopifindex = 0; /* ditto */
fd_set sockvec; /* vector to select() for receiving */
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 strucutre. 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
* supressing 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 */
};
struct riprt *riprt = 0;
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 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;
struct rtentry rtentry;
int interval = 1;
time_t nextalarm = 0;
time_t sup_trig_update = 0;
FILE *rtlog = NULL;
int logopened = 0;
static u_long seq = 0;
#define RRTF_AGGREGATE 0x08000000
#define RRTF_NOADVERTISE 0x10000000
#define RRTF_NH_NOT_LLADDR 0x20000000
#define RRTF_SENDANYWAY 0x40000000
#define RRTF_CHANGED 0x80000000
int main __P((int, char **));
void ripalarm __P((int));
void riprecv __P((void));
void ripsend __P((struct ifc *, struct sockaddr_in6 *, int));
void init __P((void));
void sockopt __P((struct ifc *));
void ifconfig __P((void));
void ifconfig1 __P((const char *, const struct sockaddr *, struct ifc *, int));
void rtrecv __P((void));
int rt_del __P((const struct sockaddr_in6 *, const struct sockaddr_in6 *,
const struct sockaddr_in6 *));
int rt_deladdr __P((struct ifc *, const struct sockaddr_in6 *,
const struct sockaddr_in6 *));
void filterconfig __P((void));
int getifmtu __P((int));
const char *rttypes __P((struct rt_msghdr *rtm));
const char *rtflags __P((struct rt_msghdr *rtm));
const char *ifflags __P((int flags));
void ifrt __P((struct ifc *, int));
void ifrt_p2p __P((struct ifc *, int));
void applymask __P((struct in6_addr *, struct in6_addr *));
void applyplen __P((struct in6_addr *, int));
void ifrtdump __P((int));
void ifdump __P((int));
void ifdump0 __P((FILE *, const struct ifc *));
void rtdump __P((int));
void rt_entry __P((struct rt_msghdr *, int));
void rtdexit __P((int));
void riprequest __P((struct ifc *, struct netinfo6 *, int, struct sockaddr_in6 *));
void ripflush __P((struct ifc *, struct sockaddr_in6 *));
void sendrequest __P((struct ifc *));
int mask2len __P((const struct in6_addr *, int));
int sendpacket __P((struct sockaddr_in6 *, int));
int addroute __P((struct riprt *, const struct in6_addr *, struct ifc *));
int delroute __P((struct netinfo6 *, struct in6_addr *));
struct in6_addr *getroute __P((struct netinfo6 *, struct in6_addr *));
void krtread __P((int));
int tobeadv __P((struct riprt *, struct ifc *));
char *allocopy __P((char *));
char *hms __P((void));
const char *inet6_n2p __P((const struct in6_addr *));
struct ifac *ifa_match __P((const struct ifc *, const struct in6_addr *, int));
struct in6_addr *plen2mask __P((int));
struct riprt *rtsearch __P((struct netinfo6 *));
int ripinterval __P((int));
time_t ripsuptrig __P((void));
void fatal __P((const char *, ...));
void trace __P((int, const char *, ...));
void tracet __P((int, const char *, ...));
unsigned int if_maxindex __P((void));
struct ifc *ifc_find __P((char *));
struct iff *iff_find __P((struct ifc *, int));
void setindex2ifc __P((int, struct ifc *));
#define MALLOC(type) ((type *)malloc(sizeof(type)))
int
main(argc, argv)
int argc;
char **argv;
{
int ch;
int error = 0;
struct ifc *ifcp;
sigset_t mask, omask;
FILE *pidfile;
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")) != EOF) {
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 '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");
if (geteuid()) {
nflag = 1;
fprintf(stderr, "No kernel update is allowed\n");
}
openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON);
logopened++;
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");
loopifindex = loopifcp->ifc_index;
for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
ifrt(ifcp, 0);
filterconfig();
krtread(0);
if (dflag)
ifrtdump(0);
if (dflag == 0) {
#if 1
if (daemon(0, 0) < 0)
fatal("daemon");
#else
if (fork())
exit(0);
if (setsid() < 0)
fatal("setid");
#endif
}
pid = getpid();
if ((pidfile = fopen(ROUTE6D_PID, "w")) != NULL) {
fprintf(pidfile, "%d\n", pid);
fclose(pidfile);
}
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;
if (signal(SIGALRM, ripalarm) == SIG_ERR)
fatal("signal: SIGALRM");
if (signal(SIGQUIT, rtdexit) == SIG_ERR)
fatal("signal: SIGQUIT");
if (signal(SIGTERM, rtdexit) == SIG_ERR)
fatal("signal: SIGTERM");
if (signal(SIGUSR1, ifrtdump) == SIG_ERR)
fatal("signal: SIGUSR1");
if (signal(SIGHUP, ifrtdump) == SIG_ERR)
fatal("signal: SIGHUP");
if (signal(SIGINT, ifrtdump) == SIG_ERR)
fatal("signal: SIGINT");
/*
* 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 (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
sendrequest(ifcp);
}
syslog(LOG_INFO, "**** Started ****");
sigemptyset(&mask);
sigaddset(&mask, SIGALRM);
while (1) {
fd_set recvec;
FD_COPY(&sockvec, &recvec);
switch (select(FD_SETSIZE, &recvec, 0, 0, 0)) {
case -1:
if (errno == EINTR)
continue;
fatal("select");
case 0:
continue;
default:
if (FD_ISSET(ripsock, &recvec)) {
sigprocmask(SIG_BLOCK, &mask, &omask);
riprecv();
sigprocmask(SIG_SETMASK, &omask, NULL);
}
if (FD_ISSET(rtsock, &recvec)) {
sigprocmask(SIG_BLOCK, &mask, &omask);
rtrecv();
sigprocmask(SIG_SETMASK, &omask, NULL);
}
}
}
}
/*
* gracefully exits after resetting sockopts.
*/
/* ARGSUSED */
void
rtdexit(sig)
int sig;
{
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 */
void
ripalarm(sig)
int sig;
{
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));
}
void
init()
{
int i, int0, int255, error;
struct addrinfo hints, *res;
char port[10];
ifc = (struct ifc *)NULL;
nifc = 0;
nindex2ifc = 0; /*initial guess*/
index2ifc = NULL;
snprintf(port, sizeof(port), "%d", 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(gai_strerror(error));
if (res->ai_next)
fatal(":: resolved to multiple address");
int0 = 0; int255 = 255;
ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (ripsock < 0)
fatal("rip socket");
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;
#ifdef IPV6_RECVPKTINFO
if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &i,
sizeof(i)) < 0)
fatal("rip IPV6_RECVPKTINFO");
#else /* old adv. API */
if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_PKTINFO, &i,
sizeof(i)) < 0)
fatal("rip IPV6_PKTINFO");
#endif
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(gai_strerror(error));
if (res->ai_next)
fatal("%s resolved to multiple address", RIP6_DEST);
memcpy(&ripsin, res->ai_addr, res->ai_addrlen);
#ifdef FD_ZERO
FD_ZERO(&sockvec);
#else
memset(&sockvec, 0, sizeof(sockvec));
#endif
FD_SET(ripsock, &sockvec);
if (nflag == 0) {
if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0)
fatal("route socket");
FD_SET(rtsock, &sockvec);
} else
rtsock = -1; /*just for safety */
}
#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 *np;
void
ripflush(ifcp, sin)
struct ifc *ifcp;
struct sockaddr_in6 *sin;
{
int i;
int error;
if (ifcp)
tracet(1, "Send(%s): info(%d) to %s.%d\n",
ifcp->ifc_name, nrt,
inet6_n2p(&sin->sin6_addr), ntohs(sin->sin6_port));
else
tracet(1, "Send: info(%d) to %s.%d\n",
nrt, inet6_n2p(&sin->sin6_addr), ntohs(sin->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(sin, 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 */
}
nrt = 0; np = ripbuf->rip6_nets;
}
/*
* Generate RIP6_RESPONSE packets and send them.
*/
void
ripsend(ifcp, sin, flag)
struct ifc *ifcp;
struct sockaddr_in6 *sin;
int flag;
{
struct riprt *rrt;
struct in6_addr *nh; /* next hop */
struct in6_addr ia;
struct iff *iffp;
int maxrte, ok;
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; np = 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 */
*np = rrt->rrt_info;
np++; nrt++;
if (nrt == maxrte) {
ripflush(NULL, sin);
nh = NULL;
}
}
if (nrt) /* Send last packet */
ripflush(NULL, sin);
return;
}
if ((flag & RRTF_SENDANYWAY) == 0 &&
(qflag || (ifcp->ifc_flags & IFF_LOOPBACK)))
return;
if (iff_find(ifcp, 'N') != NULL)
return;
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_tag = htons(routetag & 0xffff);
np = ripbuf->rip6_nets;
*np = rrt_info;
nrt = 1;
ripflush(ifcp, sin);
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;
for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
if (rrt->rrt_rflags & RRTF_NOADVERTISE)
continue;
/* Need to check filer here */
ok = 1;
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)) {
ok = 0;
break;
}
}
if (!ok)
continue;
for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
if (iffp->iff_type != 'O')
continue;
ok = 0;
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)
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, sin);
np->rip6_dest = rrt->rrt_gw;
if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest))
SET_IN6_LINKLOCAL_IFINDEX(np->rip6_dest, 0);
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, sin);
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, sin);
nh = NULL;
}
}
if (nrt) /* Send last packet */
ripflush(ifcp, sin);
}
/*
* 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(rrt, ifcp)
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(sin, len)
struct sockaddr_in6 *sin;
int len;
{
/*
* MSG_DONTROUTE should not be specified when it responds with a
* RIP6_REQUEST message. SO_DONTROUTE has been specified to
* other sockets.
*/
struct msghdr m;
struct cmsghdr *cm;
struct iovec iov[2];
u_char cmsgbuf[256];
struct in6_pktinfo *pi;
int index;
struct sockaddr_in6 sincopy;
/* do not overwrite the given sin */
sincopy = *sin;
sin = &sincopy;
if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr)
|| IN6_IS_ADDR_MULTICAST(&sin->sin6_addr)) {
index = IN6_LINKLOCAL_IFINDEX(sin->sin6_addr);
SET_IN6_LINKLOCAL_IFINDEX(sin->sin6_addr, 0);
} else
index = 0;
m.msg_name = (caddr_t)sin;
m.msg_namelen = sizeof(*sin);
iov[0].iov_base = (caddr_t)ripbuf;
iov[0].iov_len = len;
m.msg_iov = iov;
m.msg_iovlen = 1;
if (!index) {
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 = index;
}
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()
{
struct ifc *ifcp, *ic;
struct sockaddr_in6 fsock;
struct in6_addr nh; /* next hop */
struct rip6 *rp;
struct netinfo6 *np, *nq;
struct riprt *rrt;
int len, nn, need_trigger, index;
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;
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");
index = 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));
index = pi->ipi6_ifindex;
break;
}
}
if (index && IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr))
SET_IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr, index);
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 (index && index < nindex2ifc) {
ifcp = index2ifc[index];
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 */
}
index = IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr);
ifcp = (index < nindex2ifc) ? index2ifc[index] : NULL;
if (!ifcp) {
trace(1, "Packets to unknown interface index %d\n", index);
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;
}
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), nn);
t = time(NULL);
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, index);
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;
}