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|
/* $OpenBSD: slaacd.c,v 1.5 2017/07/14 09:29:40 florian Exp $ */
/*
* Copyright (c) 2017 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.
*/
#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 <sys/wait.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet6/in6_var.h>
#include <err.h>
#include <errno.h>
#include <event.h>
#include <imsg.h>
#include <pwd.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include "log.h"
#include "slaacd.h"
#include "frontend.h"
#include "engine.h"
#include "control.h"
#ifndef SMALL
const char* imsg_type_name[] = {
"IMSG_NONE",
"IMSG_CTL_LOG_VERBOSE",
"IMSG_CTL_SHOW_INTERFACE_INFO",
"IMSG_CTL_SHOW_INTERFACE_INFO_RA",
"IMSG_CTL_SHOW_INTERFACE_INFO_RA_PREFIX",
"IMSG_CTL_SHOW_INTERFACE_INFO_RA_RDNS",
"IMSG_CTL_SHOW_INTERFACE_INFO_RA_DNSSL",
"IMSG_CTL_SHOW_INTERFACE_INFO_ADDR_PROPOSALS",
"IMSG_CTL_SHOW_INTERFACE_INFO_ADDR_PROPOSAL",
"IMSG_CTL_SHOW_INTERFACE_INFO_DFR_PROPOSALS",
"IMSG_CTL_SHOW_INTERFACE_INFO_DFR_PROPOSAL",
"IMSG_CTL_END",
"IMSG_CTL_SEND_SOLICITATION",
"IMSG_SOCKET_IPC",
"IMSG_STARTUP",
"IMSG_UPDATE_IF",
"IMSG_REMOVE_IF",
"IMSG_RA",
"IMSG_PROPOSAL",
"IMSG_PROPOSAL_ACK",
"IMSG_CONFIGURE_ADDRESS",
"IMSG_DEL_ADDRESS",
"IMSG_FAKE_ACK",
"IMSG_CONFIGURE_DFR",
"IMSG_WITHDRAW_DFR",
};
#endif /* SMALL */
__dead void usage(void);
__dead void main_shutdown(void);
void main_sig_handler(int, short, void *);
static pid_t start_child(int, char *, int, int, int, char *);
void main_dispatch_frontend(int, short, void *);
void main_dispatch_engine(int, short, void *);
void handle_proposal(struct imsg_proposal *);
void configure_interface(struct imsg_configure_address *);
void configure_gateway(struct imsg_configure_dfr *, uint8_t);
void add_gateway(struct imsg_configure_dfr *);
void delete_gateway(struct imsg_configure_dfr *);
static int main_imsg_send_ipc_sockets(struct imsgbuf *, struct imsgbuf *);
struct imsgev *iev_frontend;
struct imsgev *iev_engine;
pid_t frontend_pid;
pid_t engine_pid;
uint32_t cmd_opts;
int routesock, ioctl_sock;
char *csock;
int rtm_seq = 0;
void
main_sig_handler(int sig, short event, void *arg)
{
/*
* Normal signal handler rules don't apply because libevent
* decouples for us.
*/
switch (sig) {
case SIGTERM:
case SIGINT:
main_shutdown();
case SIGHUP:
log_debug("sighub received");
break;
default:
fatalx("unexpected signal");
}
}
__dead void
usage(void)
{
extern char *__progname;
fprintf(stderr, "usage: %s [-dv] [-s socket]\n",
__progname);
exit(1);
}
int
main(int argc, char *argv[])
{
struct event ev_sigint, ev_sigterm, ev_sighup;
int ch;
int debug = 0, engine_flag = 0, frontend_flag = 0;
char *saved_argv0;
int pipe_main2frontend[2];
int pipe_main2engine[2];
csock = SLAACD_SOCKET;
log_init(1, LOG_DAEMON); /* Log to stderr until daemonized. */
log_setverbose(1);
saved_argv0 = argv[0];
if (saved_argv0 == NULL)
saved_argv0 = "slaacd";
while ((ch = getopt(argc, argv, "dEFs:v")) != -1) {
switch (ch) {
case 'd':
debug = 1;
break;
case 'E':
engine_flag = 1;
break;
case 'F':
frontend_flag = 1;
break;
case 's':
csock = optarg;
break;
case 'v':
if (cmd_opts & OPT_VERBOSE)
cmd_opts |= OPT_VERBOSE2;
cmd_opts |= OPT_VERBOSE;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc > 0 || (engine_flag && frontend_flag))
usage();
if (engine_flag)
engine(debug, cmd_opts & OPT_VERBOSE);
else if (frontend_flag)
frontend(debug, cmd_opts & OPT_VERBOSE, csock);
/* Check for root privileges. */
if (geteuid())
errx(1, "need root privileges");
/* Check for assigned daemon user */
if (getpwnam(SLAACD_USER) == NULL)
errx(1, "unknown user %s", SLAACD_USER);
log_init(debug, LOG_DAEMON);
log_setverbose(cmd_opts & OPT_VERBOSE);
if (!debug)
daemon(1, 0);
log_info("startup");
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
PF_UNSPEC, pipe_main2frontend) == -1)
fatal("main2frontend socketpair");
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
PF_UNSPEC, pipe_main2engine) == -1)
fatal("main2engine socketpair");
/* Start children. */
engine_pid = start_child(PROC_ENGINE, saved_argv0, pipe_main2engine[1],
debug, cmd_opts & OPT_VERBOSE, NULL);
frontend_pid = start_child(PROC_FRONTEND, saved_argv0,
pipe_main2frontend[1], debug, cmd_opts & OPT_VERBOSE, csock);
slaacd_process = PROC_MAIN;
log_procinit(log_procnames[slaacd_process]);
if ((routesock = socket(PF_ROUTE, SOCK_RAW | SOCK_CLOEXEC |
SOCK_NONBLOCK, 0)) < 0)
fatal("route socket");
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_sighup, SIGHUP, main_sig_handler, NULL);
signal_add(&ev_sigint, NULL);
signal_add(&ev_sigterm, NULL);
signal_add(&ev_sighup, NULL);
signal(SIGPIPE, SIG_IGN);
/* Setup pipes to children. */
if ((iev_frontend = malloc(sizeof(struct imsgev))) == NULL ||
(iev_engine = malloc(sizeof(struct imsgev))) == NULL)
fatal(NULL);
imsg_init(&iev_frontend->ibuf, pipe_main2frontend[0]);
iev_frontend->handler = main_dispatch_frontend;
imsg_init(&iev_engine->ibuf, pipe_main2engine[0]);
iev_engine->handler = main_dispatch_engine;
/* Setup event handlers for pipes to engine & frontend. */
iev_frontend->events = EV_READ;
event_set(&iev_frontend->ev, iev_frontend->ibuf.fd,
iev_frontend->events, iev_frontend->handler, iev_frontend);
event_add(&iev_frontend->ev, NULL);
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);
if (main_imsg_send_ipc_sockets(&iev_frontend->ibuf, &iev_engine->ibuf))
fatal("could not establish imsg links");
if ((ioctl_sock = socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, 0)) < 0)
fatal("socket");
#if 0
/* XXX ioctl SIOCAIFADDR_IN6 */
if (pledge("rpath stdio sendfd cpath", NULL) == -1)
fatal("pledge");
#endif
main_imsg_compose_frontend(IMSG_STARTUP, 0, NULL, 0);
event_dispatch();
main_shutdown();
return (0);
}
__dead void
main_shutdown(void)
{
pid_t pid;
int status;
/* Close pipes. */
msgbuf_clear(&iev_frontend->ibuf.w);
close(iev_frontend->ibuf.fd);
msgbuf_clear(&iev_engine->ibuf.w);
close(iev_engine->ibuf.fd);
log_debug("waiting for children to terminate");
do {
pid = wait(&status);
if (pid == -1) {
if (errno != EINTR && errno != ECHILD)
fatal("wait");
} else if (WIFSIGNALED(status))
log_warnx("%s terminated; signal %d",
(pid == engine_pid) ? "engine" :
"frontend", WTERMSIG(status));
} while (pid != -1 || (pid == -1 && errno == EINTR));
free(iev_frontend);
free(iev_engine);
#ifndef SMALL
control_cleanup(csock);
#endif /* SMALL */
log_info("terminating");
exit(0);
}
static pid_t
start_child(int p, char *argv0, int fd, int debug, int verbose, char *sockname)
{
char *argv[7];
int argc = 0;
pid_t pid;
switch (pid = fork()) {
case -1:
fatal("cannot fork");
case 0:
break;
default:
close(fd);
return (pid);
}
if (dup2(fd, 3) == -1)
fatal("cannot setup imsg fd");
argv[argc++] = argv0;
switch (p) {
case PROC_MAIN:
fatalx("Can not start main process");
case PROC_ENGINE:
argv[argc++] = "-E";
break;
case PROC_FRONTEND:
argv[argc++] = "-F";
break;
}
if (debug)
argv[argc++] = "-d";
if (verbose)
argv[argc++] = "-v";
if (sockname) {
argv[argc++] = "-s";
argv[argc++] = sockname;
}
argv[argc++] = NULL;
execvp(argv0, argv);
fatal("execvp");
}
void
main_dispatch_frontend(int fd, short event, void *bula)
{
struct imsgev *iev = bula;
struct imsgbuf *ibuf;
struct imsg imsg;
struct imsg_ifinfo imsg_ifinfo;
ssize_t n;
int shut = 0;
#ifndef SMALL
int verbose;
#endif /* SMALL */
ibuf = &iev->ibuf;
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("imsg_get");
if (n == 0) /* No more messages. */
break;
switch (imsg.hdr.type) {
#ifndef SMALL
case IMSG_CTL_LOG_VERBOSE:
/* Already checked by frontend. */
memcpy(&verbose, imsg.data, sizeof(verbose));
log_setverbose(verbose);
break;
#endif /* SMALL */
case IMSG_UPDATE_IF:
if (imsg.hdr.len != IMSG_HEADER_SIZE +
sizeof(imsg_ifinfo))
fatal("%s: IMSG_UPDATE_IF wrong length: %d",
__func__, imsg.hdr.len);
memcpy(&imsg_ifinfo, imsg.data, sizeof(imsg_ifinfo));
main_imsg_compose_engine(IMSG_UPDATE_IF, 0,
&imsg_ifinfo, sizeof(imsg_ifinfo));
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
main_dispatch_engine(int fd, short event, void *bula)
{
struct imsgev *iev = bula;
struct imsgbuf *ibuf;
struct imsg imsg;
struct imsg_proposal proposal;
struct imsg_configure_address address;
struct imsg_configure_dfr dfr;
ssize_t n;
int shut = 0;
ibuf = &iev->ibuf;
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("imsg_get");
if (n == 0) /* No more messages. */
break;
switch (imsg.hdr.type) {
case IMSG_PROPOSAL:
if (imsg.hdr.len != IMSG_HEADER_SIZE + sizeof(proposal))
fatal("%s: IMSG_PROPOSAL wrong "
"length: %d", __func__, imsg.hdr.len);
memcpy(&proposal, imsg.data, sizeof(proposal));
handle_proposal(&proposal);
break;
case IMSG_CONFIGURE_ADDRESS:
if (imsg.hdr.len != IMSG_HEADER_SIZE + sizeof(address))
fatal("%s: IMSG_CONFIGURE_ADDRESS wrong "
"length: %d", __func__, imsg.hdr.len);
memcpy(&address, imsg.data, sizeof(address));
configure_interface(&address);
break;
case IMSG_CONFIGURE_DFR:
if (imsg.hdr.len != IMSG_HEADER_SIZE + sizeof(dfr))
fatal("%s: IMSG_CONFIGURE_DFR wrong "
"length: %d", __func__, imsg.hdr.len);
memcpy(&dfr, imsg.data, sizeof(dfr));
add_gateway(&dfr);
break;
case IMSG_WITHDRAW_DFR:
if (imsg.hdr.len != IMSG_HEADER_SIZE + sizeof(dfr))
fatal("%s: IMSG_CONFIGURE_DFR wrong "
"length: %d", __func__, imsg.hdr.len);
memcpy(&dfr, imsg.data, sizeof(dfr));
delete_gateway(&dfr);
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);
}
}
int
main_imsg_compose_frontend(int type, pid_t pid, void *data, uint16_t datalen)
{
if (iev_frontend)
return (imsg_compose_event(iev_frontend, type, 0, pid, -1, data,
datalen));
else
return (-1);
}
int
main_imsg_compose_engine(int type, pid_t pid, void *data, uint16_t datalen)
{
if (iev_engine)
return(imsg_compose_event(iev_engine, type, 0, pid, -1, data,
datalen));
else
return (-1);
}
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, uint16_t type, uint32_t peerid,
pid_t pid, int fd, void *data, uint16_t datalen)
{
int ret;
if ((ret = imsg_compose(&iev->ibuf, type, peerid, pid, fd, data,
datalen)) != -1)
imsg_event_add(iev);
return (ret);
}
static int
main_imsg_send_ipc_sockets(struct imsgbuf *frontend_buf,
struct imsgbuf *engine_buf)
{
int pipe_frontend2engine[2];
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
PF_UNSPEC, pipe_frontend2engine) == -1)
return (-1);
if (imsg_compose(frontend_buf, IMSG_SOCKET_IPC, 0, 0,
pipe_frontend2engine[0], NULL, 0) == -1)
return (-1);
imsg_flush(frontend_buf);
if (imsg_compose(engine_buf, IMSG_SOCKET_IPC, 0, 0,
pipe_frontend2engine[1], NULL, 0) == -1)
return (-1);
imsg_flush(engine_buf);
return (0);
}
#define ROUNDUP(a) \
(((a) & (sizeof(long) - 1)) ? (1 + ((a) | (sizeof(long) - 1))) : (a))
void
handle_proposal(struct imsg_proposal *proposal)
{
struct rt_msghdr rtm;
struct sockaddr_in6 ifa, mask;
struct sockaddr_rtlabel rl;
struct iovec iov[13];
long pad = 0;
int iovcnt = 0, padlen;
memset(&rtm, 0, sizeof(rtm));
rtm.rtm_version = RTM_VERSION;
rtm.rtm_type = RTM_PROPOSAL;
rtm.rtm_msglen = sizeof(rtm);
rtm.rtm_tableid = 0; /* XXX imsg->rdomain; */
rtm.rtm_index = proposal->if_index;
rtm.rtm_seq = ++rtm_seq;
rtm.rtm_priority = RTP_PROPOSAL_SLAAC;
rtm.rtm_addrs = (proposal->rtm_addrs & (RTA_NETMASK | RTA_IFA)) |
RTA_LABEL;
rtm.rtm_flags = RTF_UP;
iov[iovcnt].iov_base = &rtm;
iov[iovcnt++].iov_len = sizeof(rtm);
if (rtm.rtm_addrs & RTA_NETMASK) {
memset(&mask, 0, sizeof(mask));
mask.sin6_family = AF_INET6;
mask.sin6_len = sizeof(struct sockaddr_in6);
mask.sin6_addr = proposal->mask;
iov[iovcnt].iov_base = &mask;
iov[iovcnt++].iov_len = sizeof(mask);
rtm.rtm_msglen += sizeof(mask);
padlen = ROUNDUP(sizeof(mask)) - sizeof(mask);
if (padlen > 0) {
iov[iovcnt].iov_base = &pad;
iov[iovcnt++].iov_len = padlen;
rtm.rtm_msglen += padlen;
}
}
if (rtm.rtm_addrs & RTA_IFA) {
memcpy(&ifa, &proposal->addr, sizeof(ifa));
if (ifa.sin6_family != AF_INET6 || ifa.sin6_len !=
sizeof(struct sockaddr_in6)) {
log_warnx("%s: invalid address", __func__);
return;
}
iov[iovcnt].iov_base = &ifa;
iov[iovcnt++].iov_len = sizeof(ifa);
rtm.rtm_msglen += sizeof(ifa);
padlen = ROUNDUP(sizeof(ifa)) - sizeof(ifa);
if (padlen > 0) {
iov[iovcnt].iov_base = &pad;
iov[iovcnt++].iov_len = padlen;
rtm.rtm_msglen += padlen;
}
}
rl.sr_len = sizeof(rl);
rl.sr_family = AF_UNSPEC;
if (snprintf(rl.sr_label, sizeof(rl.sr_label), "%s: %lld %d", "slaacd",
proposal->id, (int32_t)proposal->pid) >=
(ssize_t)sizeof(rl.sr_label))
log_warnx("route label truncated");
iov[iovcnt].iov_base = &rl;
iov[iovcnt++].iov_len = sizeof(rl);
rtm.rtm_msglen += sizeof(rl);
padlen = ROUNDUP(sizeof(rl)) - sizeof(rl);
if (padlen > 0) {
iov[iovcnt].iov_base = &pad;
iov[iovcnt++].iov_len = padlen;
rtm.rtm_msglen += padlen;
}
if (writev(routesock, iov, iovcnt) == -1)
log_warn("failed to send proposal");
}
void
configure_interface(struct imsg_configure_address *address)
{
struct in6_aliasreq in6_addreq;
time_t t;
char *if_name;
memset(&in6_addreq, 0, sizeof(in6_addreq));
if_name = if_indextoname(address->if_index, in6_addreq.ifra_name);
if (if_name == NULL) {
log_warnx("%s: cannot find interface %d", __func__,
address->if_index);
return;
}
memcpy(&in6_addreq.ifra_addr, &address->addr,
sizeof(in6_addreq.ifra_addr));
memcpy(&in6_addreq.ifra_prefixmask.sin6_addr, &address->mask,
sizeof(in6_addreq.ifra_prefixmask.sin6_addr));
in6_addreq.ifra_prefixmask.sin6_family = AF_INET6;
in6_addreq.ifra_prefixmask.sin6_len =
sizeof(in6_addreq.ifra_prefixmask);
t = time(NULL);
in6_addreq.ifra_lifetime.ia6t_expire = t + address->vltime;
in6_addreq.ifra_lifetime.ia6t_vltime = address->vltime;
in6_addreq.ifra_lifetime.ia6t_preferred = t + address->pltime;
in6_addreq.ifra_lifetime.ia6t_pltime = address->pltime;
in6_addreq.ifra_flags |= IN6_IFF_AUTOCONF;
if (address->privacy)
in6_addreq.ifra_flags |= IN6_IFF_PRIVACY;
log_debug("%s: %s", __func__, if_name);
if (ioctl(ioctl_sock, SIOCAIFADDR_IN6, &in6_addreq) < 0)
fatal("SIOCAIFADDR_IN6");
}
void
configure_gateway(struct imsg_configure_dfr *dfr, uint8_t rtm_type)
{
struct rt_msghdr rtm;
struct sockaddr_in6 dst, gw, mask;
struct iovec iov[8];
long pad = 0;
int iovcnt = 0, padlen;
memset(&rtm, 0, sizeof(rtm));
rtm.rtm_version = RTM_VERSION;
rtm.rtm_type = rtm_type;
rtm.rtm_msglen = sizeof(rtm);
rtm.rtm_tableid = 0; /* XXX imsg->rdomain; */
rtm.rtm_index = dfr->if_index;
rtm.rtm_seq = ++rtm_seq;
rtm.rtm_priority = RTP_DEFAULT;
rtm.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
rtm.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
iov[iovcnt].iov_base = &rtm;
iov[iovcnt++].iov_len = sizeof(rtm);
memset(&dst, 0, sizeof(mask));
dst.sin6_family = AF_INET6;
dst.sin6_len = sizeof(struct sockaddr_in6);
iov[iovcnt].iov_base = &dst;
iov[iovcnt++].iov_len = sizeof(dst);
rtm.rtm_msglen += sizeof(dst);
padlen = ROUNDUP(sizeof(dst)) - sizeof(dst);
if (padlen > 0) {
iov[iovcnt].iov_base = &pad;
iov[iovcnt++].iov_len = padlen;
rtm.rtm_msglen += padlen;
}
memcpy(&gw, &dfr->addr, sizeof(gw));
*(u_int16_t *)& gw.sin6_addr.s6_addr[2] = htons(gw.sin6_scope_id);
/* gw.sin6_scope_id = 0; XXX route(8) does this*/
iov[iovcnt].iov_base = &gw;
iov[iovcnt++].iov_len = sizeof(gw);
rtm.rtm_msglen += sizeof(gw);
padlen = ROUNDUP(sizeof(gw)) - sizeof(gw);
if (padlen > 0) {
iov[iovcnt].iov_base = &pad;
iov[iovcnt++].iov_len = padlen;
rtm.rtm_msglen += padlen;
}
memset(&mask, 0, sizeof(mask));
mask.sin6_family = AF_INET6;
mask.sin6_len = 0;//sizeof(struct sockaddr_in6);
iov[iovcnt].iov_base = &mask;
iov[iovcnt++].iov_len = sizeof(mask);
rtm.rtm_msglen += sizeof(mask);
padlen = ROUNDUP(sizeof(mask)) - sizeof(mask);
if (padlen > 0) {
iov[iovcnt].iov_base = &pad;
iov[iovcnt++].iov_len = padlen;
rtm.rtm_msglen += padlen;
}
if (writev(routesock, iov, iovcnt) == -1)
log_warn("failed to send route message");
}
void
add_gateway(struct imsg_configure_dfr *dfr)
{
configure_gateway(dfr, RTM_ADD);
}
void
delete_gateway(struct imsg_configure_dfr *dfr)
{
configure_gateway(dfr, RTM_DELETE);
}
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