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|
/* $OpenBSD: ospf6d.c,v 1.20 2010/07/06 13:24:35 bluhm Exp $ */
/*
* Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
* Copyright (c) 2004, 2007 Esben Norby <norby@openbsd.org>
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <event.h>
#include <err.h>
#include <errno.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include "ospf6d.h"
#include "ospf6.h"
#include "ospfe.h"
#include "control.h"
#include "log.h"
#include "rde.h"
void main_sig_handler(int, short, void *);
__dead void usage(void);
void ospfd_shutdown(void);
int check_child(pid_t, const char *);
void main_dispatch_ospfe(int, short, void *);
void main_dispatch_rde(int, short, void *);
void ospf_redistribute_default(int);
int ospf_reload(void);
int ospf_sendboth(enum imsg_type, void *, u_int16_t);
int merge_interfaces(struct area *, struct area *);
struct iface *iface_lookup(struct area *, struct iface *);
int pipe_parent2ospfe[2];
int pipe_parent2rde[2];
int pipe_ospfe2rde[2];
struct ospfd_conf *ospfd_conf = NULL;
struct imsgev *iev_ospfe;
struct imsgev *iev_rde;
char *conffile;
pid_t ospfe_pid = 0;
pid_t rde_pid = 0;
/* ARGSUSED */
void
main_sig_handler(int sig, short event, void *arg)
{
/*
* signal handler rules don't apply, libevent decouples for us
*/
int die = 0;
switch (sig) {
case SIGTERM:
case SIGINT:
die = 1;
/* FALLTHROUGH */
case SIGCHLD:
if (check_child(ospfe_pid, "ospf engine")) {
ospfe_pid = 0;
die = 1;
}
if (check_child(rde_pid, "route decision engine")) {
rde_pid = 0;
die = 1;
}
if (die)
ospfd_shutdown();
break;
case SIGHUP:
if (ospf_reload() == -1)
log_warnx("configuration reload failed");
else
log_debug("configuration reloaded");
break;
default:
fatalx("unexpected signal");
/* NOTREACHED */
}
}
__dead void
usage(void)
{
extern char *__progname;
fprintf(stderr, "usage: %s [-dnv] [-D macro=value] [-f file]\n",
__progname);
exit(1);
}
int
main(int argc, char *argv[])
{
struct event ev_sigint, ev_sigterm, ev_sigchld, ev_sighup;
int ch, opts = 0;
int debug = 0;
int ipforwarding;
int mib[4];
size_t len;
conffile = CONF_FILE;
ospfd_process = PROC_MAIN;
log_init(1); /* log to stderr until daemonized */
while ((ch = getopt(argc, argv, "cdD:f:nv")) != -1) {
switch (ch) {
case 'c':
opts |= OSPFD_OPT_FORCE_DEMOTE;
break;
case 'd':
debug = 1;
break;
case 'D':
if (cmdline_symset(optarg) < 0)
log_warnx("could not parse macro definition %s",
optarg);
break;
case 'f':
conffile = optarg;
break;
case 'n':
opts |= OSPFD_OPT_NOACTION;
break;
case 'v':
if (opts & OSPFD_OPT_VERBOSE)
opts |= OSPFD_OPT_VERBOSE2;
opts |= OSPFD_OPT_VERBOSE;
log_verbose(1);
break;
default:
usage();
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (argc > 0)
usage();
mib[0] = CTL_NET;
mib[1] = PF_INET6;
mib[2] = IPPROTO_IPV6;
mib[3] = IPCTL_FORWARDING;
len = sizeof(ipforwarding);
if (sysctl(mib, 4, &ipforwarding, &len, NULL, 0) == -1)
err(1, "sysctl");
if (ipforwarding != 1) {
log_warnx("WARNING: IPv6 forwarding NOT enabled, "
"running as stub router");
opts |= OSPFD_OPT_STUB_ROUTER;
}
/* prepare and fetch interfaces early */
if_init();
/* parse config file */
if ((ospfd_conf = parse_config(conffile, opts)) == NULL )
exit(1);
if (ospfd_conf->opts & OSPFD_OPT_NOACTION) {
if (ospfd_conf->opts & OSPFD_OPT_VERBOSE)
print_config(ospfd_conf);
else
fprintf(stderr, "configuration OK\n");
exit(0);
}
/* check for root privileges */
if (geteuid())
errx(1, "need root privileges");
/* check for ospfd user */
if (getpwnam(OSPF6D_USER) == NULL)
errx(1, "unknown user %s", OSPF6D_USER);
log_init(debug);
if (!debug)
daemon(1, 0);
log_info("startup");
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC,
pipe_parent2ospfe) == -1)
fatal("socketpair");
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_parent2rde) == -1)
fatal("socketpair");
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_ospfe2rde) == -1)
fatal("socketpair");
session_socket_blockmode(pipe_parent2ospfe[0], BM_NONBLOCK);
session_socket_blockmode(pipe_parent2ospfe[1], BM_NONBLOCK);
session_socket_blockmode(pipe_parent2rde[0], BM_NONBLOCK);
session_socket_blockmode(pipe_parent2rde[1], BM_NONBLOCK);
session_socket_blockmode(pipe_ospfe2rde[0], BM_NONBLOCK);
session_socket_blockmode(pipe_ospfe2rde[1], BM_NONBLOCK);
/* start children */
rde_pid = rde(ospfd_conf, pipe_parent2rde, pipe_ospfe2rde,
pipe_parent2ospfe);
ospfe_pid = ospfe(ospfd_conf, pipe_parent2ospfe, pipe_ospfe2rde,
pipe_parent2rde);
/* show who we are */
setproctitle("parent");
event_init();
/* setup signal handler */
signal_set(&ev_sigint, SIGINT, main_sig_handler, NULL);
signal_set(&ev_sigterm, SIGTERM, main_sig_handler, NULL);
signal_set(&ev_sigchld, SIGCHLD, main_sig_handler, NULL);
signal_set(&ev_sighup, SIGHUP, main_sig_handler, NULL);
signal_add(&ev_sigint, NULL);
signal_add(&ev_sigterm, NULL);
signal_add(&ev_sigchld, NULL);
signal_add(&ev_sighup, NULL);
signal(SIGPIPE, SIG_IGN);
/* setup pipes to children */
close(pipe_parent2ospfe[1]);
close(pipe_parent2rde[1]);
close(pipe_ospfe2rde[0]);
close(pipe_ospfe2rde[1]);
if ((iev_ospfe = malloc(sizeof(struct imsgev))) == NULL ||
(iev_rde = malloc(sizeof(struct imsgev))) == NULL)
fatal(NULL);
imsg_init(&iev_ospfe->ibuf, pipe_parent2ospfe[0]);
iev_ospfe->handler = main_dispatch_ospfe;
imsg_init(&iev_rde->ibuf, pipe_parent2rde[0]);
iev_rde->handler = main_dispatch_rde;
/* setup event handler */
iev_ospfe->events = EV_READ;
event_set(&iev_ospfe->ev, iev_ospfe->ibuf.fd, iev_ospfe->events,
iev_ospfe->handler, iev_ospfe);
event_add(&iev_ospfe->ev, NULL);
iev_rde->events = EV_READ;
event_set(&iev_rde->ev, iev_rde->ibuf.fd, iev_rde->events,
iev_rde->handler, iev_rde);
event_add(&iev_rde->ev, NULL);
if (kr_init(!(ospfd_conf->flags & OSPFD_FLAG_NO_FIB_UPDATE)) == -1)
fatalx("kr_init failed");
/* redistribute default */
ospf_redistribute_default(IMSG_NETWORK_ADD);
event_dispatch();
ospfd_shutdown();
/* NOTREACHED */
return (0);
}
void
ospfd_shutdown(void)
{
pid_t pid;
if (ospfe_pid)
kill(ospfe_pid, SIGTERM);
if (rde_pid)
kill(rde_pid, SIGTERM);
control_cleanup();
kr_shutdown();
carp_demote_shutdown();
do {
if ((pid = wait(NULL)) == -1 &&
errno != EINTR && errno != ECHILD)
fatal("wait");
} while (pid != -1 || (pid == -1 && errno == EINTR));
msgbuf_clear(&iev_ospfe->ibuf.w);
free(iev_ospfe);
msgbuf_clear(&iev_rde->ibuf.w);
free(iev_rde);
free(ospfd_conf);
log_info("terminating");
exit(0);
}
int
check_child(pid_t pid, const char *pname)
{
int status;
if (waitpid(pid, &status, WNOHANG) > 0) {
if (WIFEXITED(status)) {
log_warnx("lost child: %s exited", pname);
return (1);
}
if (WIFSIGNALED(status)) {
log_warnx("lost child: %s terminated; signal %d",
pname, WTERMSIG(status));
return (1);
}
}
return (0);
}
/* imsg handling */
/* ARGSUSED */
void
main_dispatch_ospfe(int fd, short event, void *bula)
{
struct imsgev *iev = bula;
struct imsgbuf *ibuf = &iev->ibuf;
struct imsg imsg;
struct demote_msg dmsg;
ssize_t n;
int shut = 0, verbose;
if (event & EV_READ) {
if ((n = imsg_read(ibuf)) == -1)
fatal("imsg_read error");
if (n == 0) /* connection closed */
shut = 1;
}
if (event & EV_WRITE) {
if (msgbuf_write(&ibuf->w) == -1)
fatal("msgbuf_write");
}
for (;;) {
if ((n = imsg_get(ibuf, &imsg)) == -1)
fatal("imsg_get");
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_CTL_RELOAD:
if (ospf_reload() == -1)
log_warnx("configuration reload failed");
else
log_debug("configuration reloaded");
break;
case IMSG_CTL_FIB_COUPLE:
kr_fib_couple();
break;
case IMSG_CTL_FIB_DECOUPLE:
kr_fib_decouple();
break;
case IMSG_CTL_KROUTE:
case IMSG_CTL_KROUTE_ADDR:
kr_show_route(&imsg);
break;
case IMSG_DEMOTE:
if (imsg.hdr.len - IMSG_HEADER_SIZE != sizeof(dmsg))
fatalx("invalid size of OE request");
memcpy(&dmsg, imsg.data, sizeof(dmsg));
carp_demote_set(dmsg.demote_group, dmsg.level);
break;
case IMSG_CTL_LOG_VERBOSE:
/* already checked by ospfe */
memcpy(&verbose, imsg.data, sizeof(verbose));
log_verbose(verbose);
break;
default:
log_debug("main_dispatch_ospfe: error handling imsg %d",
imsg.hdr.type);
break;
}
imsg_free(&imsg);
}
if (!shut)
imsg_event_add(iev);
else {
/* this pipe is dead, so remove the event handler */
event_del(&iev->ev);
event_loopexit(NULL);
}
}
/* ARGSUSED */
void
main_dispatch_rde(int fd, short event, void *bula)
{
struct imsgev *iev = bula;
struct imsgbuf *ibuf = &iev->ibuf;
struct imsg imsg;
ssize_t n;
int shut = 0;
if (event & EV_READ) {
if ((n = imsg_read(ibuf)) == -1)
fatal("imsg_read error");
if (n == 0) /* connection closed */
shut = 1;
}
if (event & EV_WRITE) {
if (msgbuf_write(&ibuf->w) == -1)
fatal("msgbuf_write");
}
for (;;) {
if ((n = imsg_get(ibuf, &imsg)) == -1)
fatal("imsg_get");
if (n == 0)
break;
switch (imsg.hdr.type) {
case IMSG_KROUTE_CHANGE:
if (kr_change(imsg.data))
log_warn("main_dispatch_rde: error changing "
"route");
break;
case IMSG_KROUTE_DELETE:
if (kr_delete(imsg.data))
log_warn("main_dispatch_rde: error deleting "
"route");
break;
default:
log_debug("main_dispatch_rde: error handling imsg %d",
imsg.hdr.type);
break;
}
imsg_free(&imsg);
}
if (!shut)
imsg_event_add(iev);
else {
/* this pipe is dead, so remove the event handler */
event_del(&iev->ev);
event_loopexit(NULL);
}
}
void
main_imsg_compose_ospfe(int type, pid_t pid, void *data, u_int16_t datalen)
{
if (iev_ospfe == NULL)
return;
imsg_compose_event(iev_ospfe, type, 0, pid, -1, data, datalen);
}
void
main_imsg_compose_rde(int type, pid_t pid, void *data, u_int16_t datalen)
{
if (iev_rde == NULL)
return;
imsg_compose_event(iev_rde, type, 0, pid, -1, data, datalen);
}
void
imsg_event_add(struct imsgev *iev)
{
iev->events = EV_READ;
if (iev->ibuf.w.queued)
iev->events |= EV_WRITE;
event_del(&iev->ev);
event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev);
event_add(&iev->ev, NULL);
}
int
imsg_compose_event(struct imsgev *iev, u_int16_t type, u_int32_t peerid,
pid_t pid, int fd, void *data, u_int16_t datalen)
{
int ret;
if ((ret = imsg_compose(&iev->ibuf, type, peerid,
pid, fd, data, datalen)) != -1)
imsg_event_add(iev);
return (ret);
}
int
ospf_redistribute(struct kroute *kr, u_int32_t *metric)
{
struct redistribute *r;
struct in6_addr ina, inb;
/* only allow 0.0.0.0/0 via REDISTRIBUTE_DEFAULT */
if (IN6_IS_ADDR_UNSPECIFIED(&kr->prefix) && kr->prefixlen == 0)
return (0);
SIMPLEQ_FOREACH(r, &ospfd_conf->redist_list, entry) {
switch (r->type & ~REDIST_NO) {
case REDIST_LABEL:
if (kr->rtlabel == r->label) {
*metric = r->metric;
return (r->type & REDIST_NO ? 0 : 1);
}
break;
case REDIST_STATIC:
/*
* Dynamic routes are not redistributable. Placed here
* so that link local addresses can be redistributed
* via a rtlabel.
*/
if (kr->flags & F_DYNAMIC)
continue;
if (kr->flags & F_STATIC) {
*metric = r->metric;
return (r->type & REDIST_NO ? 0 : 1);
}
break;
case REDIST_CONNECTED:
if (kr->flags & F_DYNAMIC)
continue;
if (kr->flags & F_CONNECTED) {
*metric = r->metric;
return (r->type & REDIST_NO ? 0 : 1);
}
break;
case REDIST_ADDR:
if (kr->flags & F_DYNAMIC)
continue;
inet6applymask(&ina, &kr->prefix, kr->prefixlen);
inet6applymask(&inb, &r->addr, r->prefixlen);
if (IN6_ARE_ADDR_EQUAL(&ina, &inb) &&
kr->prefixlen >= r->prefixlen) {
*metric = r->metric;
return (r->type & REDIST_NO ? 0 : 1);
}
break;
}
}
return (0);
}
void
ospf_redistribute_default(int type)
{
struct rroute rr;
if (!(ospfd_conf->redistribute & REDISTRIBUTE_DEFAULT))
return;
bzero(&rr, sizeof(rr));
rr.metric = ospfd_conf->defaultmetric;
main_imsg_compose_rde(type, 0, &rr, sizeof(struct rroute));
}
int
ospf_reload(void)
{
struct area *area;
struct ospfd_conf *xconf;
if ((xconf = parse_config(conffile, ospfd_conf->opts)) == NULL)
return (-1);
/* send config to childs */
if (ospf_sendboth(IMSG_RECONF_CONF, xconf, sizeof(*xconf)) == -1)
return (-1);
/* send areas, interfaces happen out of band */
LIST_FOREACH(area, &xconf->area_list, entry) {
if (ospf_sendboth(IMSG_RECONF_AREA, area, sizeof(*area)) == -1)
return (-1);
}
if (ospf_sendboth(IMSG_RECONF_END, NULL, 0) == -1)
return (-1);
/* XXX send newly available interfaces to the childs */
merge_config(ospfd_conf, xconf);
/* update redistribute lists */
kr_reload();
return (0);
}
int
ospf_sendboth(enum imsg_type type, void *buf, u_int16_t len)
{
if (imsg_compose_event(iev_ospfe, type, 0, 0, -1, buf, len) == -1)
return (-1);
if (imsg_compose_event(iev_rde, type, 0, 0, -1, buf, len) == -1)
return (-1);
return (0);
}
void
merge_config(struct ospfd_conf *conf, struct ospfd_conf *xconf)
{
struct area *a, *xa, *na;
struct iface *iface;
struct redistribute *r;
/* change of rtr_id needs a restart */
conf->flags = xconf->flags;
conf->spf_delay = xconf->spf_delay;
conf->spf_hold_time = xconf->spf_hold_time;
conf->redistribute = xconf->redistribute;
if (ospfd_process == PROC_MAIN) {
/* main process does neither use areas nor interfaces */
while ((r = SIMPLEQ_FIRST(&conf->redist_list)) != NULL) {
SIMPLEQ_REMOVE_HEAD(&conf->redist_list, entry);
free(r);
}
while ((r = SIMPLEQ_FIRST(&xconf->redist_list)) != NULL) {
SIMPLEQ_REMOVE_HEAD(&xconf->redist_list, entry);
SIMPLEQ_INSERT_TAIL(&conf->redist_list, r, entry);
}
goto done;
}
/* merge areas and interfaces */
for (a = LIST_FIRST(&conf->area_list); a != NULL; a = na) {
na = LIST_NEXT(a, entry);
/* find deleted areas */
if ((xa = area_find(xconf, a->id)) == NULL) {
if (ospfd_process == PROC_OSPF_ENGINE) {
LIST_FOREACH(iface, &a->iface_list, entry)
if_fsm(iface, IF_EVT_DOWN);
}
LIST_REMOVE(a, entry);
area_del(a);
}
}
for (xa = LIST_FIRST(&xconf->area_list); xa != NULL; xa = na) {
na = LIST_NEXT(xa, entry);
if ((a = area_find(conf, xa->id)) == NULL) {
LIST_REMOVE(xa, entry);
LIST_INSERT_HEAD(&conf->area_list, xa, entry);
if (ospfd_process == PROC_OSPF_ENGINE) {
/* start interfaces */
ospfe_demote_area(xa, 0);
LIST_FOREACH(iface, &xa->iface_list, entry)
if_start(conf, iface);
}
/* no need to merge interfaces */
continue;
}
/*
* stub is not yet used but switching between stub and normal
* will be another painful job.
*/
a->stub = xa->stub;
a->stub_default_cost = xa->stub_default_cost;
if (ospfd_process == PROC_RDE_ENGINE)
a->dirty = 1; /* force SPF tree recalculation */
/* merge interfaces */
if (merge_interfaces(a, xa) &&
ospfd_process == PROC_OSPF_ENGINE)
a->dirty = 1; /* force rtr LSA update */
}
if (ospfd_process == PROC_OSPF_ENGINE) {
LIST_FOREACH(a, &conf->area_list, entry) {
LIST_FOREACH(iface, &a->iface_list, entry) {
if (iface->state == IF_STA_NEW) {
iface->state = IF_STA_DOWN;
if_start(conf, iface);
}
}
if (a->dirty) {
a->dirty = 0;
orig_rtr_lsa(LIST_FIRST(&a->iface_list));
}
}
}
done:
while ((a = LIST_FIRST(&xconf->area_list)) != NULL) {
LIST_REMOVE(a, entry);
area_del(a);
}
free(xconf);
}
int
merge_interfaces(struct area *a, struct area *xa)
{
struct iface *i, *xi, *ni;
int dirty = 0;
/* problems:
* - new interfaces (easy)
* - deleted interfaces (needs to be done via fsm?)
* - changing passive (painful?)
*/
for (i = LIST_FIRST(&a->iface_list); i != NULL; i = ni) {
ni = LIST_NEXT(i, entry);
if (iface_lookup(xa, i) == NULL) {
log_debug("merge_interfaces: proc %d area %s removing "
"interface %s", ospfd_process, inet_ntoa(a->id),
i->name);
if (ospfd_process == PROC_OSPF_ENGINE)
if_fsm(i, IF_EVT_DOWN);
LIST_REMOVE(i, entry);
if_del(i);
}
}
for (xi = LIST_FIRST(&xa->iface_list); xi != NULL; xi = ni) {
ni = LIST_NEXT(xi, entry);
if ((i = iface_lookup(a, xi)) == NULL) {
/* new interface but delay initialisation */
log_debug("merge_interfaces: proc %d area %s adding "
"interface %s", ospfd_process, inet_ntoa(a->id),
xi->name);
LIST_REMOVE(xi, entry);
LIST_INSERT_HEAD(&a->iface_list, xi, entry);
if (ospfd_process == PROC_OSPF_ENGINE)
xi->state = IF_STA_NEW;
continue;
}
log_debug("merge_interfaces: proc %d area %s merging "
"interface %s", ospfd_process, inet_ntoa(a->id), i->name);
i->addr = xi->addr;
i->dst = xi->dst;
i->abr_id = xi->abr_id;
i->baudrate = xi->baudrate;
i->dead_interval = xi->dead_interval;
i->mtu = xi->mtu;
i->transmit_delay = xi->transmit_delay;
i->hello_interval = xi->hello_interval;
i->rxmt_interval = xi->rxmt_interval;
if (i->metric != xi->metric)
dirty = 1;
i->metric = xi->metric;
i->priority = xi->priority;
i->flags = xi->flags; /* needed? */
i->type = xi->type; /* needed? */
i->media_type = xi->media_type; /* needed? */
i->linkstate = xi->linkstate; /* needed? */
#if 0 /* XXX needs some kind of love */
if (i->passive != xi->passive) {
/* need to restart interface to cope with this change */
if (ospfd_process == PROC_OSPF_ENGINE)
if_fsm(i, IF_EVT_DOWN);
i->passive = xi->passive;
if (ospfd_process == PROC_OSPF_ENGINE)
if_fsm(i, IF_EVT_UP);
}
#endif
}
return (dirty);
}
struct iface *
iface_lookup(struct area *area, struct iface *iface)
{
struct iface *i;
LIST_FOREACH(i, &area->iface_list, entry)
if (i->ifindex == iface->ifindex)
return (i);
return (NULL);
}
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