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src/usr.sbin/rad/frontend.c

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/* $OpenBSD: frontend.c,v 1.45 2024/04/23 22:11:59 florian Exp $ */
/*
* Copyright (c) 2018 Florian Obser <florian@openbsd.org>
* Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
* Copyright (c) 2004 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.
*/
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/uio.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/route.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet6/nd6.h>
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#include <ctype.h>
#include <errno.h>
#include <event.h>
#include <ifaddrs.h>
#include <imsg.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "log.h"
#include "rad.h"
#include "frontend.h"
#include "control.h"
#define RA_MAX_SIZE 1500
#define ROUTE_SOCKET_BUF_SIZE 16384
struct icmp6_ev {
struct event ev;
uint8_t answer[1500];
struct msghdr rcvmhdr;
struct iovec rcviov[1];
struct sockaddr_in6 from;
int refcnt;
};
struct ra_iface {
TAILQ_ENTRY(ra_iface) entry;
struct icmp6_ev *icmp6ev;
struct ra_prefix_conf_head prefixes;
char name[IF_NAMESIZE];
char conf_name[IF_NAMESIZE];
uint32_t if_index;
int rdomain;
int removed;
int link_state;
int prefix_count;
size_t datalen;
uint8_t data[RA_MAX_SIZE];
};
#define ND_OPT_PREF64 38
struct nd_opt_pref64 {
u_int8_t nd_opt_pref64_type;
u_int8_t nd_opt_pref64_len;
u_int16_t nd_opt_pref64_sltime_plc;
u_int8_t nd_opt_pref64[12];
};
TAILQ_HEAD(, ra_iface) ra_interfaces;
__dead void frontend_shutdown(void);
void frontend_sig_handler(int, short, void *);
void frontend_startup(void);
void icmp6_receive(int, short, void *);
void join_all_routers_mcast_group(struct ra_iface *);
void leave_all_routers_mcast_group(struct ra_iface *);
int get_link_state(char *);
int get_ifrdomain(char *);
void merge_ra_interface(char *, char *);
void merge_ra_interfaces(void);
struct ra_iface *find_ra_iface_by_id(uint32_t);
struct ra_iface *find_ra_iface_by_name(char *);
struct ra_iface_conf *find_ra_iface_conf(struct ra_iface_conf_head *,
char *);
struct ra_prefix_conf *find_ra_prefix_conf(struct ra_prefix_conf_head*,
struct in6_addr *, int);
struct icmp6_ev *get_icmp6ev_by_rdomain(int);
void unref_icmp6ev(struct ra_iface *);
void set_icmp6sock(int, int);
void add_new_prefix_to_ra_iface(struct ra_iface *r,
struct in6_addr *, int, struct ra_prefix_conf *);
void free_ra_iface(struct ra_iface *);
int in6_mask2prefixlen(struct in6_addr *);
void get_interface_prefixes(struct ra_iface *,
struct ra_prefix_conf *);
int interface_has_linklocal_address(char *);
void build_packet(struct ra_iface *);
void build_leaving_packet(struct ra_iface *);
void ra_output(struct ra_iface *, struct sockaddr_in6 *);
void get_rtaddrs(int, struct sockaddr *,
struct sockaddr **);
void route_receive(int, short, void *);
void handle_route_message(struct rt_msghdr *,
struct sockaddr **);
struct rad_conf *frontend_conf;
static struct imsgev *iev_main;
static struct imsgev *iev_engine;
struct event ev_route;
int ioctlsock = -1, routesock = -1;
struct ipv6_mreq all_routers;
struct msghdr sndmhdr;
struct iovec sndiov[2];
void
frontend_sig_handler(int sig, short event, void *bula)
{
/*
* Normal signal handler rules don't apply because libevent
* decouples for us.
*/
switch (sig) {
case SIGINT:
case SIGTERM:
frontend_shutdown();
default:
fatalx("unexpected signal");
}
}
void
frontend(int debug, int verbose)
{
struct event ev_sigint, ev_sigterm;
struct passwd *pw;
size_t sndcmsgbuflen;
uint8_t *sndcmsgbuf = NULL;
frontend_conf = config_new_empty();
log_init(debug, LOG_DAEMON);
log_setverbose(verbose);
if ((pw = getpwnam(RAD_USER)) == NULL)
fatal("getpwnam");
if (chroot(pw->pw_dir) == -1)
fatal("chroot");
if (chdir("/") == -1)
fatal("chdir(\"/\")");
setproctitle("%s", "frontend");
log_procinit("frontend");
if (setgroups(1, &pw->pw_gid) ||
setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
fatal("can't drop privileges");
/* XXX pass in from main */
if ((ioctlsock = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, 0)) == -1)
fatal("socket");
if (pledge("stdio inet unix recvfd route mcast", NULL) == -1)
fatal("pledge");
event_init();
/* Setup signal handler. */
signal_set(&ev_sigint, SIGINT, frontend_sig_handler, NULL);
signal_set(&ev_sigterm, SIGTERM, frontend_sig_handler, NULL);
signal_add(&ev_sigint, NULL);
signal_add(&ev_sigterm, NULL);
signal(SIGPIPE, SIG_IGN);
signal(SIGHUP, SIG_IGN);
/* Setup pipe and event handler to the parent process. */
if ((iev_main = malloc(sizeof(struct imsgev))) == NULL)
fatal(NULL);
imsg_init(&iev_main->ibuf, 3);
iev_main->handler = frontend_dispatch_main;
iev_main->events = EV_READ;
event_set(&iev_main->ev, iev_main->ibuf.fd, iev_main->events,
iev_main->handler, iev_main);
event_add(&iev_main->ev, NULL);
if (inet_pton(AF_INET6, "ff02::2",
&all_routers.ipv6mr_multiaddr.s6_addr) == -1)
fatal("inet_pton");
sndcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
CMSG_SPACE(sizeof(int));
if ((sndcmsgbuf = malloc(sndcmsgbuflen)) == NULL)
fatal("%s", __func__);
sndmhdr.msg_namelen = sizeof(struct sockaddr_in6);
sndmhdr.msg_iov = sndiov;
sndmhdr.msg_iovlen = 1;
sndmhdr.msg_control = sndcmsgbuf;
sndmhdr.msg_controllen = sndcmsgbuflen;
TAILQ_INIT(&ra_interfaces);
event_dispatch();
frontend_shutdown();
}
__dead void
frontend_shutdown(void)
{
/* Close pipes. */
msgbuf_write(&iev_engine->ibuf.w);
msgbuf_clear(&iev_engine->ibuf.w);
close(iev_engine->ibuf.fd);
msgbuf_write(&iev_main->ibuf.w);
msgbuf_clear(&iev_main->ibuf.w);
close(iev_main->ibuf.fd);
config_clear(frontend_conf);
free(iev_engine);
free(iev_main);
log_info("frontend exiting");
exit(0);
}
int
frontend_imsg_compose_main(int type, pid_t pid, void *data, uint16_t datalen)
{
return (imsg_compose_event(iev_main, type, 0, pid, -1, data,
datalen));
}
int
frontend_imsg_compose_engine(int type, pid_t pid, void *data, uint16_t datalen)
{
return (imsg_compose_event(iev_engine, type, 0, pid, -1, data,
datalen));
}
void
frontend_dispatch_main(int fd, short event, void *bula)
{
static struct rad_conf *nconf;
static struct ra_iface_conf *ra_iface_conf;
static struct ra_options_conf *ra_options;
struct imsg imsg;
struct imsgev *iev = bula;
struct imsgbuf *ibuf = &iev->ibuf;
struct ra_prefix_conf *ra_prefix_conf;
struct ra_rdnss_conf *ra_rdnss_conf;
struct ra_dnssl_conf *ra_dnssl_conf;
struct ra_pref64_conf *pref64;
int n, shut = 0, icmp6sock, rdomain;
if (event & EV_READ) {
if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
fatal("imsg_read error");
if (n == 0) /* Connection closed. */
shut = 1;
}
if (event & EV_WRITE) {
if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
fatal("msgbuf_write");
if (n == 0) /* Connection closed. */
shut = 1;
}
for (;;) {
if ((n = imsg_get(ibuf, &imsg)) == -1)
fatal("%s: imsg_get error", __func__);
if (n == 0) /* No more messages. */
break;
switch (imsg.hdr.type) {
case IMSG_SOCKET_IPC:
/*
* Setup pipe and event handler to the engine
* process.
*/
if (iev_engine)
fatalx("%s: received unexpected imsg fd to "
"frontend", __func__);
if ((fd = imsg_get_fd(&imsg)) == -1)
fatalx("%s: expected to receive imsg fd to "
"frontend but didn't receive any",
__func__);
iev_engine = malloc(sizeof(struct imsgev));
if (iev_engine == NULL)
fatal(NULL);
imsg_init(&iev_engine->ibuf, fd);
iev_engine->handler = frontend_dispatch_engine;
iev_engine->events = EV_READ;
event_set(&iev_engine->ev, iev_engine->ibuf.fd,
iev_engine->events, iev_engine->handler, iev_engine);
event_add(&iev_engine->ev, NULL);
break;
case IMSG_RECONF_CONF:
if (nconf != NULL)
fatalx("%s: IMSG_RECONF_CONF already in "
"progress", __func__);
if (IMSG_DATA_SIZE(imsg) != sizeof(struct rad_conf))
fatalx("%s: IMSG_RECONF_CONF wrong length: %lu",
__func__, IMSG_DATA_SIZE(imsg));
if ((nconf = malloc(sizeof(struct rad_conf))) ==
NULL)
fatal(NULL);
memcpy(nconf, imsg.data, sizeof(struct rad_conf));
SIMPLEQ_INIT(&nconf->ra_iface_list);
SIMPLEQ_INIT(&nconf->ra_options.ra_rdnss_list);
SIMPLEQ_INIT(&nconf->ra_options.ra_dnssl_list);
SIMPLEQ_INIT(&nconf->ra_options.ra_pref64_list);
ra_options = &nconf->ra_options;
break;
case IMSG_RECONF_RA_IFACE:
if (IMSG_DATA_SIZE(imsg) != sizeof(struct
ra_iface_conf))
fatalx("%s: IMSG_RECONF_RA_IFACE wrong length: "
"%lu", __func__, IMSG_DATA_SIZE(imsg));
if ((ra_iface_conf = malloc(sizeof(struct
ra_iface_conf))) == NULL)
fatal(NULL);
memcpy(ra_iface_conf, imsg.data, sizeof(struct
ra_iface_conf));
ra_iface_conf->autoprefix = NULL;
SIMPLEQ_INIT(&ra_iface_conf->ra_prefix_list);
SIMPLEQ_INIT(&ra_iface_conf->ra_options.ra_rdnss_list);
SIMPLEQ_INIT(&ra_iface_conf->ra_options.ra_dnssl_list);
SIMPLEQ_INIT(&ra_iface_conf->ra_options.ra_pref64_list);
SIMPLEQ_INSERT_TAIL(&nconf->ra_iface_list,
ra_iface_conf, entry);
ra_options = &ra_iface_conf->ra_options;
break;
case IMSG_RECONF_RA_AUTOPREFIX:
if (IMSG_DATA_SIZE(imsg) != sizeof(struct
ra_prefix_conf))
fatalx("%s: IMSG_RECONF_RA_AUTOPREFIX wrong "
"length: %lu", __func__,
IMSG_DATA_SIZE(imsg));
if ((ra_iface_conf->autoprefix = malloc(sizeof(struct
ra_prefix_conf))) == NULL)
fatal(NULL);
memcpy(ra_iface_conf->autoprefix, imsg.data,
sizeof(struct ra_prefix_conf));
break;
case IMSG_RECONF_RA_PREFIX:
if (IMSG_DATA_SIZE(imsg) != sizeof(struct
ra_prefix_conf))
fatalx("%s: IMSG_RECONF_RA_PREFIX wrong "
"length: %lu", __func__,
IMSG_DATA_SIZE(imsg));
if ((ra_prefix_conf = malloc(sizeof(struct
ra_prefix_conf))) == NULL)
fatal(NULL);
memcpy(ra_prefix_conf, imsg.data,
sizeof(struct ra_prefix_conf));
SIMPLEQ_INSERT_TAIL(&ra_iface_conf->ra_prefix_list,
ra_prefix_conf, entry);
break;
case IMSG_RECONF_RA_RDNSS:
if (IMSG_DATA_SIZE(imsg) != sizeof(struct
ra_rdnss_conf))
fatalx("%s: IMSG_RECONF_RA_RDNSS wrong length: "
"%lu", __func__, IMSG_DATA_SIZE(imsg));
if ((ra_rdnss_conf = malloc(sizeof(struct
ra_rdnss_conf))) == NULL)
fatal(NULL);
memcpy(ra_rdnss_conf, imsg.data, sizeof(struct
ra_rdnss_conf));
SIMPLEQ_INSERT_TAIL(&ra_options->ra_rdnss_list,
ra_rdnss_conf, entry);
break;
case IMSG_RECONF_RA_DNSSL:
if (IMSG_DATA_SIZE(imsg) != sizeof(struct
ra_dnssl_conf))
fatalx("%s: IMSG_RECONF_RA_DNSSL wrong length: "
"%lu", __func__, IMSG_DATA_SIZE(imsg));
if ((ra_dnssl_conf = malloc(sizeof(struct
ra_dnssl_conf))) == NULL)
fatal(NULL);
memcpy(ra_dnssl_conf, imsg.data, sizeof(struct
ra_dnssl_conf));
SIMPLEQ_INSERT_TAIL(&ra_options->ra_dnssl_list,
ra_dnssl_conf, entry);
break;
case IMSG_RECONF_RA_PREF64:
if (IMSG_DATA_SIZE(imsg) != sizeof(struct
ra_pref64_conf))
fatalx("%s: IMSG_RECONF_RA_PREF64 wrong length: "
"%lu", __func__, IMSG_DATA_SIZE(imsg));
if ((pref64 = malloc(sizeof(struct ra_pref64_conf))) ==
NULL)
fatal(NULL);
memcpy(pref64, imsg.data, sizeof(struct ra_pref64_conf));
SIMPLEQ_INSERT_TAIL(&ra_options->ra_pref64_list, pref64,
entry);
break;
case IMSG_RECONF_END:
if (nconf == NULL)
fatalx("%s: IMSG_RECONF_END without "
"IMSG_RECONF_CONF", __func__);
merge_config(frontend_conf, nconf);
merge_ra_interfaces();
nconf = NULL;
break;
case IMSG_ICMP6SOCK:
if ((icmp6sock = imsg_get_fd(&imsg)) == -1)
fatalx("%s: expected to receive imsg "
"ICMPv6 fd but didn't receive any",
__func__);
if (IMSG_DATA_SIZE(imsg) != sizeof(rdomain))
fatalx("%s: IMSG_ICMP6SOCK wrong length: "
"%lu", __func__, IMSG_DATA_SIZE(imsg));
memcpy(&rdomain, imsg.data, sizeof(rdomain));
set_icmp6sock(icmp6sock, rdomain);
break;
case IMSG_ROUTESOCK:
if (routesock != -1)
fatalx("%s: received unexpected routesock fd",
__func__);
if ((routesock = imsg_get_fd(&imsg)) == -1)
fatalx("%s: expected to receive imsg "
"routesocket fd but didn't receive any",
__func__);
event_set(&ev_route, routesock, EV_READ | EV_PERSIST,
route_receive, NULL);
break;
case IMSG_STARTUP:
frontend_startup();
break;
case IMSG_CONTROLFD:
if ((fd = imsg_get_fd(&imsg)) == -1)
fatalx("%s: expected to receive imsg "
"control fd but didn't receive any",
__func__);
/* Listen on control socket. */
control_listen(fd);
break;
default:
log_debug("%s: error handling imsg %d", __func__,
imsg.hdr.type);
break;
}
imsg_free(&imsg);
}
if (!shut)
imsg_event_add(iev);
else {
/* This pipe is dead. Remove its event handler. */
event_del(&iev->ev);
event_loopexit(NULL);
}
}
void
frontend_dispatch_engine(int fd, short event, void *bula)
{
struct imsgev *iev = bula;
struct imsgbuf *ibuf = &iev->ibuf;
struct imsg imsg;
struct imsg_send_ra send_ra;
struct ra_iface *ra_iface;
uint32_t if_index;
int n, shut = 0;
if (event & EV_READ) {
if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
fatal("imsg_read error");
if (n == 0) /* Connection closed. */
shut = 1;
}
if (event & EV_WRITE) {
if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
fatal("msgbuf_write");
if (n == 0) /* Connection closed. */
shut = 1;
}
for (;;) {
if ((n = imsg_get(ibuf, &imsg)) == -1)
fatal("%s: imsg_get error", __func__);
if (n == 0) /* No more messages. */
break;
switch (imsg.hdr.type) {
case IMSG_SEND_RA:
if (IMSG_DATA_SIZE(imsg) != sizeof(send_ra))
fatalx("%s: IMSG_SEND_RA wrong length: %lu",
__func__, IMSG_DATA_SIZE(imsg));
memcpy(&send_ra, imsg.data, sizeof(send_ra));
ra_iface = find_ra_iface_by_id(send_ra.if_index);
if (ra_iface)
ra_output(ra_iface, &send_ra.to);
break;
case IMSG_REMOVE_IF:
if (IMSG_DATA_SIZE(imsg) != sizeof(if_index))
fatalx("%s: IMSG_REMOVE_IF wrong length: %lu",
__func__, IMSG_DATA_SIZE(imsg));
memcpy(&if_index, imsg.data, sizeof(if_index));
ra_iface = find_ra_iface_by_id(if_index);
if (ra_iface) {
TAILQ_REMOVE(&ra_interfaces, ra_iface, entry);
free_ra_iface(ra_iface);
}
break;
default:
log_debug("%s: error handling imsg %d", __func__,
imsg.hdr.type);
break;
}
imsg_free(&imsg);
}
if (!shut)
imsg_event_add(iev);
else {
/* This pipe is dead. Remove its event handler. */
event_del(&iev->ev);
event_loopexit(NULL);
}
}
void
frontend_startup(void)
{
if (!event_initialized(&ev_route))
fatalx("%s: did not receive a route socket from the main "
"process", __func__);
event_add(&ev_route, NULL);
}
void
icmp6_receive(int fd, short events, void *arg)
{
struct icmp6_ev *icmp6ev;
struct icmp6_hdr *icmp6_hdr;
struct imsg_ra_rs ra_rs;
struct in6_pktinfo *pi = NULL;
struct cmsghdr *cm;
ssize_t len;
int if_index = 0, *hlimp = NULL;
char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
icmp6ev = arg;
if ((len = recvmsg(fd, &icmp6ev->rcvmhdr, 0)) == -1) {
log_warn("recvmsg");
return;
}
if ((size_t)len < sizeof(struct icmp6_hdr))
return;
icmp6_hdr = (struct icmp6_hdr *)icmp6ev->answer;
if (icmp6_hdr->icmp6_type != ND_ROUTER_ADVERT &&
icmp6_hdr->icmp6_type != ND_ROUTER_SOLICIT)
return;
/* extract optional information via Advanced API */
for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&icmp6ev->rcvmhdr); cm;
cm = (struct cmsghdr *)CMSG_NXTHDR(&icmp6ev->rcvmhdr, cm)) {
if (cm->cmsg_level == IPPROTO_IPV6 &&
cm->cmsg_type == IPV6_PKTINFO &&
cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) {
pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
if_index = pi->ipi6_ifindex;
}
if (cm->cmsg_level == IPPROTO_IPV6 &&
cm->cmsg_type == IPV6_HOPLIMIT &&
cm->cmsg_len == CMSG_LEN(sizeof(int)))
hlimp = (int *)CMSG_DATA(cm);
}
if (if_index == 0) {
log_warnx("failed to get receiving interface");
return;
}
if (hlimp == NULL) {
log_warnx("failed to get receiving hop limit");
return;
}
if (*hlimp != 255) {
log_warnx("invalid RA or RS with hop limit of %d from %s on %s",
*hlimp, inet_ntop(AF_INET6, &icmp6ev->from.sin6_addr,
ntopbuf, INET6_ADDRSTRLEN), if_indextoname(if_index,
ifnamebuf));
return;
}
log_debug("RA or RS with hop limit of %d from %s on %s",
*hlimp, inet_ntop(AF_INET6, &icmp6ev->from.sin6_addr,
ntopbuf, INET6_ADDRSTRLEN), if_indextoname(if_index,
ifnamebuf));
if ((size_t)len > sizeof(ra_rs.packet)) {
log_warnx("invalid RA or RS with size %ld from %s on %s",
len, inet_ntop(AF_INET6, &icmp6ev->from.sin6_addr,
ntopbuf, INET6_ADDRSTRLEN), if_indextoname(if_index,
ifnamebuf));
return;
}
ra_rs.if_index = if_index;
memcpy(&ra_rs.from, &icmp6ev->from, sizeof(ra_rs.from));
ra_rs.len = len;
memcpy(ra_rs.packet, icmp6ev->answer, len);
frontend_imsg_compose_engine(IMSG_RA_RS, 0, &ra_rs, sizeof(ra_rs));
}
void
join_all_routers_mcast_group(struct ra_iface *ra_iface)
{
if (!event_initialized(&ra_iface->icmp6ev->ev))
return;
log_debug("joining multicast group on %s", ra_iface->name);
all_routers.ipv6mr_interface = ra_iface->if_index;
if (setsockopt(EVENT_FD(&ra_iface->icmp6ev->ev), IPPROTO_IPV6,
IPV6_JOIN_GROUP, &all_routers, sizeof(all_routers)) == -1)
fatal("IPV6_JOIN_GROUP(%s)", ra_iface->name);
}
void
leave_all_routers_mcast_group(struct ra_iface *ra_iface)
{
if (!event_initialized(&ra_iface->icmp6ev->ev))
return;
log_debug("leaving multicast group on %s", ra_iface->name);
all_routers.ipv6mr_interface = ra_iface->if_index;
setsockopt(EVENT_FD(&ra_iface->icmp6ev->ev), IPPROTO_IPV6,
IPV6_LEAVE_GROUP, &all_routers, sizeof(all_routers));
}
struct ra_iface*
find_ra_iface_by_id(uint32_t if_index)
{
struct ra_iface *ra_iface;
TAILQ_FOREACH(ra_iface, &ra_interfaces, entry) {
if (ra_iface->if_index == if_index)
return ra_iface;
}
return (NULL);
}
struct ra_iface*
find_ra_iface_by_name(char *if_name)
{
struct ra_iface *ra_iface;
TAILQ_FOREACH(ra_iface, &ra_interfaces, entry) {
if (strcmp(ra_iface->name, if_name) == 0)
return ra_iface;
}
return (NULL);
}
struct ra_iface_conf*
find_ra_iface_conf(struct ra_iface_conf_head *head, char *if_name)
{
struct ra_iface_conf *ra_iface_conf;
SIMPLEQ_FOREACH(ra_iface_conf, head, entry) {
if (strcmp(ra_iface_conf->name, if_name) == 0)
return ra_iface_conf;
}
return (NULL);
}
int
get_link_state(char *if_name)
{
struct ifaddrs *ifap, *ifa;
int ls = LINK_STATE_UNKNOWN;
if (getifaddrs(&ifap) != 0) {
log_warn("getifaddrs");
return LINK_STATE_UNKNOWN;
}
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (ifa->ifa_addr == NULL ||
ifa->ifa_addr->sa_family != AF_LINK)
continue;
if (strcmp(if_name, ifa->ifa_name) != 0)
continue;
ls = ((struct if_data*)ifa->ifa_data)->ifi_link_state;
break;
}
freeifaddrs(ifap);
return ls;
}
int
get_ifrdomain(char *if_name)
{
struct ifreq ifr;
strlcpy(ifr.ifr_name, if_name, sizeof(ifr.ifr_name));
if (ioctl(ioctlsock, SIOCGIFRDOMAIN, (caddr_t)&ifr) == -1) {
log_warn("SIOCGIFRDOMAIN");
return -1;
}
return ifr.ifr_rdomainid;
}
void
merge_ra_interface(char *name, char *conf_name)
{
struct ra_iface *ra_iface;
uint32_t if_index;
int link_state, has_linklocal, ifrdomain;
link_state = get_link_state(name);
has_linklocal = interface_has_linklocal_address(name);
ifrdomain = get_ifrdomain(name);
if ((ra_iface = find_ra_iface_by_name(name)) != NULL) {
ra_iface->link_state = link_state;
if (!LINK_STATE_IS_UP(link_state)) {
log_debug("%s down, removing", name);
ra_iface->removed = 1;
} else if (!has_linklocal) {
log_debug("%s has no IPv6 link-local address, "
"removing", name);
ra_iface->removed = 1;
} else if (ifrdomain == -1) {
log_debug("can't get rdomain for %s, removing", name);
ra_iface->removed = 1;
} else if (ra_iface->rdomain != ifrdomain) {
leave_all_routers_mcast_group(ra_iface);
unref_icmp6ev(ra_iface);
ra_iface->rdomain = ifrdomain;
ra_iface->icmp6ev = get_icmp6ev_by_rdomain(ifrdomain);
join_all_routers_mcast_group(ra_iface);
ra_iface->removed = 0;
} else {
log_debug("keeping interface %s", name);
ra_iface->removed = 0;
}
return;
}
if (!LINK_STATE_IS_UP(link_state)) {
log_debug("%s down, ignoring", name);
return;
}
if (!has_linklocal) {
log_debug("%s has no IPv6 link-local address, ignoring", name);
return;
}
log_debug("new interface %s", name);
if ((if_index = if_nametoindex(name)) == 0)
return;
log_debug("adding interface %s", name);
if ((ra_iface = calloc(1, sizeof(*ra_iface))) == NULL)
fatal("%s", __func__);
strlcpy(ra_iface->name, name, sizeof(ra_iface->name));
strlcpy(ra_iface->conf_name, conf_name,
sizeof(ra_iface->conf_name));
ra_iface->if_index = if_index;
ra_iface->rdomain = ifrdomain;
SIMPLEQ_INIT(&ra_iface->prefixes);
ra_iface->icmp6ev = get_icmp6ev_by_rdomain(ifrdomain);
join_all_routers_mcast_group(ra_iface);
TAILQ_INSERT_TAIL(&ra_interfaces, ra_iface, entry);
}
void
merge_ra_interfaces(void)
{
struct ra_iface_conf *ra_iface_conf;
struct ra_prefix_conf *ra_prefix_conf;
struct ra_iface *ra_iface;
struct ifgroupreq ifgr;
struct ifg_req *ifg;
char *conf_name;
unsigned int len;
TAILQ_FOREACH(ra_iface, &ra_interfaces, entry)
ra_iface->removed = 1;
SIMPLEQ_FOREACH(ra_iface_conf, &frontend_conf->ra_iface_list, entry) {
conf_name = ra_iface_conf->name;
/* check if network interface or group */
if (isdigit((unsigned char)conf_name[strlen(conf_name) - 1])) {
merge_ra_interface(conf_name, conf_name);
} else {
log_debug("interface group %s", conf_name);
memset(&ifgr, 0, sizeof(ifgr));
strlcpy(ifgr.ifgr_name, conf_name,
sizeof(ifgr.ifgr_name));
if (ioctl(ioctlsock, SIOCGIFGMEMB,
(caddr_t)&ifgr) == -1)
continue;
len = ifgr.ifgr_len;
if ((ifgr.ifgr_groups = calloc(1, len)) == NULL)
fatal("%s: calloc", __func__);
if (ioctl(ioctlsock, SIOCGIFGMEMB,
(caddr_t)&ifgr) == -1) {
log_debug("group %s without members",
conf_name);
free(ifgr.ifgr_groups);
continue;
}
for (ifg = ifgr.ifgr_groups;
(ifg != NULL) && (len >= sizeof(struct ifg_req));
ifg++) {
len -= sizeof(struct ifg_req);
merge_ra_interface(ifg->ifgrq_member,
conf_name);
}
free(ifgr.ifgr_groups);
}
}
TAILQ_FOREACH(ra_iface, &ra_interfaces, entry) {
while ((ra_prefix_conf = SIMPLEQ_FIRST(&ra_iface->prefixes))
!= NULL) {
SIMPLEQ_REMOVE_HEAD(&ra_iface->prefixes,
entry);
free(ra_prefix_conf);
}
ra_iface->prefix_count = 0;
if (ra_iface->removed) {
log_debug("iface removed: %s", ra_iface->name);
build_leaving_packet(ra_iface);
frontend_imsg_compose_engine(IMSG_REMOVE_IF, 0,
&ra_iface->if_index, sizeof(ra_iface->if_index));
continue;
}
ra_iface_conf = find_ra_iface_conf(
&frontend_conf->ra_iface_list, ra_iface->conf_name);
log_debug("add static prefixes for %s", ra_iface->name);
SIMPLEQ_FOREACH(ra_prefix_conf, &ra_iface_conf->ra_prefix_list,
entry) {
add_new_prefix_to_ra_iface(ra_iface,
&ra_prefix_conf->prefix,
ra_prefix_conf->prefixlen, ra_prefix_conf);
}
if (ra_iface_conf->autoprefix)
get_interface_prefixes(ra_iface,
ra_iface_conf->autoprefix);
build_packet(ra_iface);
}
}
void
free_ra_iface(struct ra_iface *ra_iface)
{
struct ra_prefix_conf *prefix;
leave_all_routers_mcast_group(ra_iface);
while ((prefix = SIMPLEQ_FIRST(&ra_iface->prefixes)) != NULL) {
SIMPLEQ_REMOVE_HEAD(&ra_iface->prefixes, entry);
free(prefix);
}
unref_icmp6ev(ra_iface);
free(ra_iface);
}
/* from kame via ifconfig, where it's called prefix() */
int
in6_mask2prefixlen(struct in6_addr *in6)
{
u_char *nam = (u_char *)in6;
int byte, bit, plen = 0, size = sizeof(struct in6_addr);
for (byte = 0; byte < size; byte++, plen += 8)
if (nam[byte] != 0xff)
break;
if (byte == size)
return (plen);
for (bit = 7; bit != 0; bit--, plen++)
if (!(nam[byte] & (1 << bit)))
break;
for (; bit != 0; bit--)
if (nam[byte] & (1 << bit))
return (0);
byte++;
for (; byte < size; byte++)
if (nam[byte])
return (0);
return (plen);
}
int
interface_has_linklocal_address(char *name)
{
struct ifaddrs *ifap, *ifa;
struct sockaddr_in6 *sin6;
struct in6_ifreq ifr6;
int ret = 0;
if (getifaddrs(&ifap) != 0)
fatal("getifaddrs");
for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
if (strcmp(name, ifa->ifa_name) != 0)
continue;
if (ifa->ifa_addr == NULL ||
ifa->ifa_addr->sa_family != AF_INET6)
continue;
sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
continue;
memset(&ifr6, 0, sizeof(ifr6));
strlcpy(ifr6.ifr_name, name, sizeof(ifr6.ifr_name));
memcpy(&ifr6.ifr_addr, sin6, sizeof(ifr6.ifr_addr));
if (ioctl(ioctlsock, SIOCGIFAFLAG_IN6, (caddr_t)&ifr6) == -1) {
log_warn("SIOCGIFAFLAG_IN6");
continue;
}
if (ifr6.ifr_ifru.ifru_flags6 & (IN6_IFF_TENTATIVE |
IN6_IFF_DUPLICATED))
continue;
ret = 1;
break;
}
freeifaddrs(ifap);
return (ret);
}
void
get_interface_prefixes(struct ra_iface *ra_iface, struct ra_prefix_conf
*autoprefix)
{
struct in6_ifreq ifr6;
struct ifaddrs *ifap, *ifa;
struct sockaddr_in6 *sin6;
int prefixlen;
log_debug("%s: %s", __func__, ra_iface->name);
if (getifaddrs(&ifap) != 0)
fatal("getifaddrs");
for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
if (strcmp(ra_iface->name, ifa->ifa_name) != 0)
continue;
if (ifa->ifa_addr == NULL ||
ifa->ifa_addr->sa_family != AF_INET6)
continue;
sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
continue;
memset(&ifr6, 0, sizeof(ifr6));
strlcpy(ifr6.ifr_name, ra_iface->name, sizeof(ifr6.ifr_name));
memcpy(&ifr6.ifr_addr, sin6, sizeof(ifr6.ifr_addr));
if (ioctl(ioctlsock, SIOCGIFNETMASK_IN6, (caddr_t)&ifr6) == -1)
continue; /* addr got deleted while we were looking */
prefixlen = in6_mask2prefixlen(&((struct sockaddr_in6 *)
&ifr6.ifr_addr)->sin6_addr);
if (prefixlen == 128)
continue;
mask_prefix(&sin6->sin6_addr, prefixlen);
add_new_prefix_to_ra_iface(ra_iface, &sin6->sin6_addr,
prefixlen, autoprefix);
}
freeifaddrs(ifap);
}
struct ra_prefix_conf*
find_ra_prefix_conf(struct ra_prefix_conf_head* head, struct in6_addr *prefix,
int prefixlen)
{
struct ra_prefix_conf *ra_prefix_conf;
SIMPLEQ_FOREACH(ra_prefix_conf, head, entry) {
if (ra_prefix_conf->prefixlen == prefixlen &&
memcmp(&ra_prefix_conf->prefix, prefix, sizeof(*prefix)) ==
0)
return (ra_prefix_conf);
}
return (NULL);
}
void
add_new_prefix_to_ra_iface(struct ra_iface *ra_iface, struct in6_addr *addr,
int prefixlen, struct ra_prefix_conf *ra_prefix_conf)
{
struct ra_prefix_conf *new_ra_prefix_conf;
if (find_ra_prefix_conf(&ra_iface->prefixes, addr, prefixlen)) {
log_debug("ignoring duplicate %s/%d prefix",
in6_to_str(addr), prefixlen);
return;
}
log_debug("adding %s/%d prefix", in6_to_str(addr), prefixlen);
if ((new_ra_prefix_conf = calloc(1, sizeof(*ra_prefix_conf))) == NULL)
fatal("%s", __func__);
new_ra_prefix_conf->prefix = *addr;
new_ra_prefix_conf->prefixlen = prefixlen;
new_ra_prefix_conf->vltime = ra_prefix_conf->vltime;
new_ra_prefix_conf->pltime = ra_prefix_conf->pltime;
new_ra_prefix_conf->aflag = ra_prefix_conf->aflag;
new_ra_prefix_conf->lflag = ra_prefix_conf->lflag;
SIMPLEQ_INSERT_TAIL(&ra_iface->prefixes, new_ra_prefix_conf, entry);
ra_iface->prefix_count++;
}
void
build_packet(struct ra_iface *ra_iface)
{
struct nd_router_advert *ra;
struct nd_opt_mtu *ndopt_mtu;
struct nd_opt_prefix_info *ndopt_pi;
struct ra_iface_conf *ra_iface_conf;
struct ra_options_conf *ra_options_conf;
struct ra_prefix_conf *ra_prefix_conf;
struct nd_opt_rdnss *ndopt_rdnss;
struct nd_opt_dnssl *ndopt_dnssl;
struct nd_opt_pref64 *ndopt_pref64;
struct ra_rdnss_conf *ra_rdnss;
struct ra_dnssl_conf *ra_dnssl;
struct ra_pref64_conf *pref64;
size_t len, label_len;
uint8_t *p, buf[RA_MAX_SIZE];
char *label_start, *label_end;
ra_iface_conf = find_ra_iface_conf(&frontend_conf->ra_iface_list,
ra_iface->conf_name);
ra_options_conf = &ra_iface_conf->ra_options;
len = sizeof(*ra);
if (ra_options_conf->mtu > 0)
len += sizeof(*ndopt_mtu);
len += sizeof(*ndopt_pi) * ra_iface->prefix_count;
if (ra_iface_conf->ra_options.rdnss_count > 0)
len += sizeof(*ndopt_rdnss) +
ra_iface_conf->ra_options.rdnss_count *
sizeof(struct in6_addr);
if (ra_iface_conf->ra_options.dnssl_len > 0)
/* round up to 8 byte boundary */
len += sizeof(*ndopt_dnssl) +
((ra_iface_conf->ra_options.dnssl_len + 7) & ~7);
SIMPLEQ_FOREACH(pref64, &ra_iface_conf->ra_options.ra_pref64_list,
entry)
len += sizeof(struct nd_opt_pref64);
if (len > sizeof(ra_iface->data))
fatalx("%s: packet too big", __func__); /* XXX send multiple */
p = buf;
ra = (struct nd_router_advert *)p;
memset(ra, 0, sizeof(*ra));
ra->nd_ra_type = ND_ROUTER_ADVERT;
ra->nd_ra_curhoplimit = ra_options_conf->cur_hl;
if (ra_options_conf->m_flag)
ra->nd_ra_flags_reserved |= ND_RA_FLAG_MANAGED;
if (ra_options_conf->o_flag)
ra->nd_ra_flags_reserved |= ND_RA_FLAG_OTHER;
if (ra_iface->removed)
/* tell clients that we are no longer a default router */
ra->nd_ra_router_lifetime = 0;
else if (ra_options_conf->dfr) {
ra->nd_ra_router_lifetime =
htons(ra_options_conf->router_lifetime);
/*
* RFC 4191
* If the Router Lifetime is zero, the preference value MUST be
* set to (00) by the sender and MUST be ignored by the
* receiver.
*/
if (ra_options_conf->router_lifetime > 0)
ra->nd_ra_flags_reserved |= ra_options_conf->rtpref;
}
ra->nd_ra_reachable = htonl(ra_options_conf->reachable_time);
ra->nd_ra_retransmit = htonl(ra_options_conf->retrans_timer);
p += sizeof(*ra);
if (ra_options_conf->mtu > 0) {
ndopt_mtu = (struct nd_opt_mtu *)p;
ndopt_mtu->nd_opt_mtu_type = ND_OPT_MTU;
ndopt_mtu->nd_opt_mtu_len = 1;
ndopt_mtu->nd_opt_mtu_reserved = 0;
ndopt_mtu->nd_opt_mtu_mtu = htonl(ra_options_conf->mtu);
p += sizeof(*ndopt_mtu);
}
SIMPLEQ_FOREACH(ra_prefix_conf, &ra_iface->prefixes, entry) {
ndopt_pi = (struct nd_opt_prefix_info *)p;
memset(ndopt_pi, 0, sizeof(*ndopt_pi));
ndopt_pi->nd_opt_pi_type = ND_OPT_PREFIX_INFORMATION;
ndopt_pi->nd_opt_pi_len = 4;
ndopt_pi->nd_opt_pi_prefix_len = ra_prefix_conf->prefixlen;
if (ra_prefix_conf->lflag)
ndopt_pi->nd_opt_pi_flags_reserved |=
ND_OPT_PI_FLAG_ONLINK;
if (ra_prefix_conf->aflag)
ndopt_pi->nd_opt_pi_flags_reserved |=
ND_OPT_PI_FLAG_AUTO;
ndopt_pi->nd_opt_pi_valid_time = htonl(ra_prefix_conf->vltime);
ndopt_pi->nd_opt_pi_preferred_time =
htonl(ra_prefix_conf->pltime);
ndopt_pi->nd_opt_pi_prefix = ra_prefix_conf->prefix;
p += sizeof(*ndopt_pi);
}
if (ra_iface_conf->ra_options.rdnss_count > 0) {
ndopt_rdnss = (struct nd_opt_rdnss *)p;
ndopt_rdnss->nd_opt_rdnss_type = ND_OPT_RDNSS;
ndopt_rdnss->nd_opt_rdnss_len = 1 +
ra_iface_conf->ra_options.rdnss_count * 2;
ndopt_rdnss->nd_opt_rdnss_reserved = 0;
ndopt_rdnss->nd_opt_rdnss_lifetime =
htonl(ra_iface_conf->ra_options.rdns_lifetime);
p += sizeof(struct nd_opt_rdnss);
SIMPLEQ_FOREACH(ra_rdnss,
&ra_iface_conf->ra_options.ra_rdnss_list, entry) {
memcpy(p, &ra_rdnss->rdnss, sizeof(ra_rdnss->rdnss));
p += sizeof(ra_rdnss->rdnss);
}
}
if (ra_iface_conf->ra_options.dnssl_len > 0) {
ndopt_dnssl = (struct nd_opt_dnssl *)p;
ndopt_dnssl->nd_opt_dnssl_type = ND_OPT_DNSSL;
/* round up to 8 byte boundary */
ndopt_dnssl->nd_opt_dnssl_len = 1 +
((ra_iface_conf->ra_options.dnssl_len + 7) & ~7) / 8;
ndopt_dnssl->nd_opt_dnssl_reserved = 0;
ndopt_dnssl->nd_opt_dnssl_lifetime =
htonl(ra_iface_conf->ra_options.rdns_lifetime);
p += sizeof(struct nd_opt_dnssl);
SIMPLEQ_FOREACH(ra_dnssl,
&ra_iface_conf->ra_options.ra_dnssl_list, entry) {
label_start = ra_dnssl->search;
while ((label_end = strchr(label_start, '.')) != NULL) {
label_len = label_end - label_start;
*p++ = label_len;
memcpy(p, label_start, label_len);
p += label_len;
label_start = label_end + 1;
}
*p++ = '\0'; /* last dot */
}
/* zero pad */
while (((uintptr_t)p) % 8 != 0)
*p++ = '\0';
}
SIMPLEQ_FOREACH(pref64, &ra_iface_conf->ra_options.ra_pref64_list,
entry) {
uint16_t sltime_plc;
/* scaled lifetime in units of 8 seconds */
sltime_plc = pref64->ltime / 8;
sltime_plc = sltime_plc << 3;
/* encode prefix length in lower 3 bits */
switch (pref64->prefixlen) {
case 96:
sltime_plc |= 0;
break;
case 64:
sltime_plc |= 1;
break;
case 56:
sltime_plc |= 2;
break;
case 48:
sltime_plc |= 3;
break;
case 40:
sltime_plc |= 4;
break;
case 32:
sltime_plc |= 5;
break;
default:
fatalx("%s: invalid pref64 length: %d", __func__,
pref64->prefixlen);
}
ndopt_pref64 = (struct nd_opt_pref64 *)p;
ndopt_pref64->nd_opt_pref64_type = ND_OPT_PREF64;
ndopt_pref64->nd_opt_pref64_len = 2;
ndopt_pref64->nd_opt_pref64_sltime_plc = htons(sltime_plc);
memcpy(ndopt_pref64->nd_opt_pref64, &pref64->prefix,
sizeof(ndopt_pref64->nd_opt_pref64));
p += sizeof(struct nd_opt_pref64);
}
if (len != ra_iface->datalen || memcmp(buf, ra_iface->data, len)
!= 0) {
memcpy(ra_iface->data, buf, len);
ra_iface->datalen = len;
/* packet changed; tell engine to send new advertisements */
if (event_initialized(&ra_iface->icmp6ev->ev))
frontend_imsg_compose_engine(IMSG_UPDATE_IF, 0,
&ra_iface->if_index, sizeof(ra_iface->if_index));
}
}
void
build_leaving_packet(struct ra_iface *ra_iface)
{
struct nd_router_advert ra;
memset(&ra, 0, sizeof(ra));
ra.nd_ra_type = ND_ROUTER_ADVERT;
memcpy(ra_iface->data, &ra, sizeof(ra));
ra_iface->datalen = sizeof(ra);
}
void
ra_output(struct ra_iface *ra_iface, struct sockaddr_in6 *to)
{
struct cmsghdr *cm;
struct in6_pktinfo *pi;
ssize_t len;
int hoplimit = 255;
if (!LINK_STATE_IS_UP(ra_iface->link_state))
return;
sndmhdr.msg_name = to;
sndmhdr.msg_iov[0].iov_base = ra_iface->data;
sndmhdr.msg_iov[0].iov_len = ra_iface->datalen;
cm = CMSG_FIRSTHDR(&sndmhdr);
/* specify the outgoing interface */
cm->cmsg_level = IPPROTO_IPV6;
cm->cmsg_type = IPV6_PKTINFO;
cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
pi = (struct in6_pktinfo *)CMSG_DATA(cm);
memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr));
pi->ipi6_ifindex = ra_iface->if_index;
/* specify the hop limit of the packet */
cm = CMSG_NXTHDR(&sndmhdr, cm);
cm->cmsg_level = IPPROTO_IPV6;
cm->cmsg_type = IPV6_HOPLIMIT;
cm->cmsg_len = CMSG_LEN(sizeof(int));
memcpy(CMSG_DATA(cm), &hoplimit, sizeof(int));
log_debug("send RA on %s", ra_iface->name);
len = sendmsg(EVENT_FD(&ra_iface->icmp6ev->ev), &sndmhdr, 0);
if (len == -1)
log_warn("sendmsg on %s", ra_iface->name);
}
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
void
get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
{
int i;
for (i = 0; i < RTAX_MAX; i++) {
if (addrs & (1 << i)) {
rti_info[i] = sa;
sa = (struct sockaddr *)((char *)(sa) +
ROUNDUP(sa->sa_len));
} else
rti_info[i] = NULL;
}
}
void
route_receive(int fd, short events, void *arg)
{
static uint8_t *buf;
struct rt_msghdr *rtm;
struct sockaddr *sa, *rti_info[RTAX_MAX];
ssize_t n;
if (buf == NULL) {
buf = malloc(ROUTE_SOCKET_BUF_SIZE);
if (buf == NULL)
fatal("malloc");
}
rtm = (struct rt_msghdr *)buf;
if ((n = read(fd, buf, ROUTE_SOCKET_BUF_SIZE)) == -1) {
if (errno == EAGAIN || errno == EINTR)
return;
log_warn("dispatch_rtmsg: read error");
return;
}
if (n == 0)
fatal("routing socket closed");
if (n < (ssize_t)sizeof(rtm->rtm_msglen) || n < rtm->rtm_msglen) {
log_warnx("partial rtm of %zd in buffer", n);
return;
}
if (rtm->rtm_version != RTM_VERSION)
return;
sa = (struct sockaddr *)(buf + rtm->rtm_hdrlen);
get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
handle_route_message(rtm, rti_info);
}
void
handle_route_message(struct rt_msghdr *rtm, struct sockaddr **rti_info)
{
switch (rtm->rtm_type) {
case RTM_IFINFO:
case RTM_NEWADDR:
case RTM_DELADDR:
case RTM_CHGADDRATTR:
/*
* do the same thing as after a config reload when interfaces
* change or IPv6 addresses show up / disappear
*/
merge_ra_interfaces();
break;
default:
log_debug("unexpected RTM: %d", rtm->rtm_type);
break;
}
}
struct icmp6_ev*
get_icmp6ev_by_rdomain(int rdomain)
{
struct ra_iface *ra_iface;
struct icmp6_ev *icmp6ev = NULL;
TAILQ_FOREACH (ra_iface, &ra_interfaces, entry) {
if (ra_iface->rdomain == rdomain) {
icmp6ev = ra_iface->icmp6ev;
break;
}
}
if (icmp6ev == NULL) {
if ((icmp6ev = calloc(1, sizeof(*icmp6ev))) == NULL)
fatal("calloc");
icmp6ev->rcviov[0].iov_base = (caddr_t)icmp6ev->answer;
icmp6ev->rcviov[0].iov_len = sizeof(icmp6ev->answer);
icmp6ev->rcvmhdr.msg_name = (caddr_t)&icmp6ev->from;
icmp6ev->rcvmhdr.msg_namelen = sizeof(icmp6ev->from);
icmp6ev->rcvmhdr.msg_iov = icmp6ev->rcviov;
icmp6ev->rcvmhdr.msg_iovlen = 1;
icmp6ev->rcvmhdr.msg_controllen =
CMSG_SPACE(sizeof(struct in6_pktinfo)) +
CMSG_SPACE(sizeof(int));
if ((icmp6ev->rcvmhdr.msg_control = malloc(icmp6ev->
rcvmhdr.msg_controllen)) == NULL)
fatal("malloc");
frontend_imsg_compose_main(IMSG_OPEN_ICMP6SOCK, 0,
&rdomain, sizeof(rdomain));
}
icmp6ev->refcnt++;
return (icmp6ev);
}
void
unref_icmp6ev(struct ra_iface *ra_iface)
{
struct icmp6_ev *icmp6ev = ra_iface->icmp6ev;
ra_iface->icmp6ev = NULL;
if (icmp6ev != NULL) {
icmp6ev->refcnt--;
if (icmp6ev->refcnt == 0) {
event_del(&icmp6ev->ev);
close(EVENT_FD(&icmp6ev->ev));
free(icmp6ev);
}
}
}
void
set_icmp6sock(int icmp6sock, int rdomain)
{
struct ra_iface *ra_iface;
TAILQ_FOREACH (ra_iface, &ra_interfaces, entry) {
if (!event_initialized(&ra_iface->icmp6ev->ev) &&
ra_iface->rdomain == rdomain) {
event_set(&ra_iface->icmp6ev->ev, icmp6sock, EV_READ |
EV_PERSIST, icmp6_receive, ra_iface->icmp6ev);
event_add(&ra_iface->icmp6ev->ev, NULL);
icmp6sock = -1;
break;
}
}
if (icmp6sock != -1) {
/*
* The interface disappeared or changed rdomain while we were
* waiting for the parent process to open the raw socket.
*/
close(icmp6sock);
return;
}
TAILQ_FOREACH (ra_iface, &ra_interfaces, entry) {
if (ra_iface->rdomain == rdomain) {
join_all_routers_mcast_group(ra_iface);
frontend_imsg_compose_engine(IMSG_UPDATE_IF, 0,
&ra_iface->if_index, sizeof(ra_iface->if_index));
}
}
}
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