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|
/* $OpenBSD: frontend.c,v 1.2 2017/07/03 19:02:04 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 <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet/icmp6.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 "slaacd.h"
#include "frontend.h"
#include "control.h"
#define ROUTE_SOCKET_BUF_SIZE 16384
#define ALLROUTER "ff02::2"
__dead void frontend_shutdown(void);
void frontend_sig_handler(int, short, void *);
void update_iface(uint32_t, char*);
void frontend_startup(void);
void route_receive(int, short, void *);
void handle_route_message(struct rt_msghdr *, struct sockaddr **);
void get_rtaddrs(int, struct sockaddr *, struct sockaddr **);
void icmp6_receive(int, short, void *);
int get_flags(char *);
int get_xflags(char *);
void get_lladdr(char *, struct ether_addr *, struct sockaddr_in6 *);
void send_solicitation(uint32_t);
struct imsgev *iev_main;
struct imsgev *iev_engine;
struct event ev_route;
struct msghdr sndmhdr;
struct iovec sndiov[4];
struct nd_router_solicit rs;
struct nd_opt_hdr nd_opt_hdr;
struct ether_addr nd_opt_source_link_addr;
struct sockaddr_in6 dst;
int icmp6sock, routesock, xflagssock;
struct icmp6_ev {
struct event ev;
uint8_t answer[1500];
struct msghdr rcvmhdr;
struct iovec rcviov[1];
struct sockaddr_in6 from;
} icmp6ev;
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, char *sockname)
{
struct event ev_sigint, ev_sigterm;
struct passwd *pw;
struct icmp6_filter filt;
struct in6_pktinfo *pi;
struct cmsghdr *cm;
size_t rcvcmsglen, sndcmsglen;
int hoplimit = 255, on = 1, rtfilter;
uint8_t *rcvcmsgbuf, *sndcmsgbuf;
log_init(debug, LOG_DAEMON);
log_setverbose(verbose);
/* Create slaacd control socket outside chroot. */
if (control_init(sockname) == -1)
fatalx("control socket setup failed");
if ((pw = getpwnam(SLAACD_USER)) == NULL)
fatal("getpwnam");
if (chroot(pw->pw_dir) == -1)
fatal("chroot");
if (chdir("/") == -1)
fatal("chdir(\"/\")");
slaacd_process = PROC_FRONTEND;
setproctitle("%s", log_procnames[slaacd_process]);
log_procinit(log_procnames[slaacd_process]);
if ((icmp6sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0)
fatal("ICMPv6 socket");
if ((routesock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0)
fatal("route socket");
if ((xflagssock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
fatal("socket");
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");
if (setsockopt(icmp6sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
sizeof(on)) < 0)
fatal("IPV6_RECVPKTINFO");
if (setsockopt(icmp6sock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
sizeof(on)) < 0)
fatal("IPV6_RECVHOPLIMIT");
/* only router advertisements */
ICMP6_FILTER_SETBLOCKALL(&filt);
ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt);
if (setsockopt(icmp6sock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
sizeof(filt)) == -1)
fatal("ICMP6_FILTER");
rtfilter = ROUTE_FILTER(RTM_IFINFO) | ROUTE_FILTER(RTM_NEWADDR) |
ROUTE_FILTER(RTM_DELADDR) | ROUTE_FILTER(RTM_PROPOSAL);
if (setsockopt(routesock, PF_ROUTE, ROUTE_MSGFILTER,
&rtfilter, sizeof(rtfilter)) < 0)
fatal("setsockopt(ROUTE_MSGFILTER)");
if (pledge("stdio inet recvfd route", 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);
/* Listen on control socket. */
TAILQ_INIT(&ctl_conns);
control_listen();
event_set(&ev_route, routesock, EV_READ | EV_PERSIST, route_receive,
NULL);
event_set(&icmp6ev.ev, icmp6sock, EV_READ | EV_PERSIST, icmp6_receive,
NULL);
rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
CMSG_SPACE(sizeof(int));
if((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL)
fatal("malloc");
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_control = (caddr_t) rcvcmsgbuf;
icmp6ev.rcvmhdr.msg_controllen = rcvcmsglen;
sndcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
CMSG_SPACE(sizeof(int));
if ((sndcmsgbuf = malloc(sndcmsglen)) == NULL)
fatal("malloc");
rs.nd_rs_type = ND_ROUTER_SOLICIT;
rs.nd_rs_code = 0;
rs.nd_rs_cksum = 0;
rs.nd_rs_reserved = 0;
nd_opt_hdr.nd_opt_type = ND_OPT_SOURCE_LINKADDR;
nd_opt_hdr.nd_opt_len = 1;
memset(&dst, 0, sizeof(dst));
dst.sin6_family = AF_INET6;
if (inet_pton(AF_INET6, ALLROUTER, &dst.sin6_addr.s6_addr) != 1)
fatal("inet_pton");
sndmhdr.msg_namelen = sizeof(struct sockaddr_in6);
sndmhdr.msg_iov = sndiov;
sndmhdr.msg_iovlen = 3;
sndmhdr.msg_control = (caddr_t)sndcmsgbuf;
sndmhdr.msg_controllen = sndcmsglen;
sndmhdr.msg_name = (caddr_t)&dst;
sndmhdr.msg_iov[0].iov_base = (caddr_t)&rs;
sndmhdr.msg_iov[0].iov_len = sizeof(rs);
sndmhdr.msg_iov[1].iov_base = (caddr_t)&nd_opt_hdr;
sndmhdr.msg_iov[1].iov_len = sizeof(nd_opt_hdr);
sndmhdr.msg_iov[2].iov_base = (caddr_t)&nd_opt_source_link_addr;
sndmhdr.msg_iov[2].iov_len = sizeof(nd_opt_source_link_addr);
cm = CMSG_FIRSTHDR(&sndmhdr);
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 = 0;
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));
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);
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, uint32_t peerid, pid_t pid,
void *data, uint16_t datalen)
{
return (imsg_compose_event(iev_engine, type, peerid, pid, -1,
data, datalen));
}
void
frontend_dispatch_main(int fd, short event, void *bula)
{
struct imsg imsg;
struct imsgev *iev = bula;
struct imsgbuf *ibuf = &iev->ibuf;
ssize_t n;
int 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_SOCKET_IPC:
/*
* Setup pipe and event handler to the engine
* process.
*/
if (iev_engine) {
log_warnx("%s: received unexpected imsg fd "
"to frontend", __func__);
break;
}
if ((fd = imsg.fd) == -1) {
log_warnx("%s: expected to receive imsg fd to "
"frontend but didn't receive any",
__func__);
break;
}
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);
if (pledge("stdio inet route", NULL) == -1)
fatal("pledge");
break;
case IMSG_STARTUP:
frontend_startup();
break;
case IMSG_CTL_END:
control_imsg_relay(&imsg);
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;
ssize_t n;
int shut = 0;
uint32_t if_index;
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_CTL_END:
case IMSG_CTL_SHOW_INTERFACE_INFO:
case IMSG_CTL_SHOW_INTERFACE_INFO_RA:
case IMSG_CTL_SHOW_INTERFACE_INFO_RA_PREFIX:
case IMSG_CTL_SHOW_INTERFACE_INFO_RA_RDNS:
case IMSG_CTL_SHOW_INTERFACE_INFO_RA_DNSSL:
case IMSG_CTL_SHOW_INTERFACE_INFO_ADDR_PROPOSALS:
case IMSG_CTL_SHOW_INTERFACE_INFO_ADDR_PROPOSAL:
case IMSG_CTL_SHOW_INTERFACE_INFO_DFR_PROPOSALS:
case IMSG_CTL_SHOW_INTERFACE_INFO_DFR_PROPOSAL:
control_imsg_relay(&imsg);
break;
case IMSG_CTL_SEND_SOLICITATION:
if_index = *((uint32_t *)imsg.data);
send_solicitation(if_index);
break;
case IMSG_FAKE_ACK:
frontend_imsg_compose_engine(IMSG_PROPOSAL_ACK,
0, 0, imsg.data, sizeof(struct imsg_proposal_ack));
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
get_flags(char *if_name)
{
struct ifreq ifr;
(void) strlcpy(ifr.ifr_name, if_name, sizeof(ifr.ifr_name));
if (ioctl(xflagssock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0)
fatal("SIOCGIFFLAGS");
return ifr.ifr_flags;
}
int
get_xflags(char *if_name)
{
struct ifreq ifr;
(void) strlcpy(ifr.ifr_name, if_name, sizeof(ifr.ifr_name));
if (ioctl(xflagssock, SIOCGIFXFLAGS, (caddr_t)&ifr) < 0)
fatal("SIOCGIFXFLAGS");
return ifr.ifr_flags;
}
void
update_iface(uint32_t if_index, char* if_name)
{
struct imsg_ifinfo imsg_ifinfo;
int flags, xflags;
flags = get_flags(if_name);
xflags = get_xflags(if_name);
if (!(xflags & IFXF_AUTOCONF6))
return;
memset(&imsg_ifinfo, 0, sizeof(imsg_ifinfo));
imsg_ifinfo.if_index = if_index;
imsg_ifinfo.running = (flags & (IFF_UP | IFF_RUNNING)) == (IFF_UP |
IFF_RUNNING);
imsg_ifinfo.autoconfprivacy = !(xflags & IFXF_INET6_NOPRIVACY);
get_lladdr(if_name, &imsg_ifinfo.hw_address, &imsg_ifinfo.ll_address);
memcpy(&nd_opt_source_link_addr, &imsg_ifinfo.hw_address,
sizeof(nd_opt_source_link_addr));
frontend_imsg_compose_engine(IMSG_UPDATE_IF, 0, 0, &imsg_ifinfo,
sizeof(imsg_ifinfo));
}
void
frontend_startup(void)
{
struct if_nameindex *ifnidxp, *ifnidx;
event_add(&ev_route, NULL);
event_add(&icmp6ev.ev, NULL);
if ((ifnidxp = if_nameindex()) == NULL)
fatalx("if_nameindex");
for(ifnidx = ifnidxp; ifnidx->if_index !=0 && ifnidx->if_name != NULL;
ifnidx++)
update_iface(ifnidx->if_index, ifnidx->if_name);
if_freenameindex(ifnidxp);
}
void
route_receive(int fd, short events, void *arg)
{
static uint8_t buf[ROUTE_SOCKET_BUF_SIZE];
struct rt_msghdr *rtm;
struct sockaddr *sa, *rti_info[RTAX_MAX];
size_t len, offset;
ssize_t n;
char *next;
if ((n = read(fd, &buf, sizeof(buf))) == -1) {
if (errno == EAGAIN || errno == EINTR)
return;
log_warn("dispatch_rtmsg: read error");
return;
}
if (n == 0) {
log_warnx("routing socket closed");
return;
}
len = n;
for (offset = 0; offset < len; offset += rtm->rtm_msglen) {
next = buf + offset;
rtm = (struct rt_msghdr *)next;
if (len < offset + sizeof(u_short) ||
len < offset + rtm->rtm_msglen)
fatalx("rtmsg_process: partial rtm in buffer");
if (rtm->rtm_version != RTM_VERSION)
continue;
sa = (struct sockaddr *)(next + 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)
{
struct if_msghdr *ifm;
struct imsg_proposal_ack proposal_ack;
struct imsg_del_addr del_addr;
struct sockaddr_rtlabel *rl;
int64_t id, pid;
int flags, xflags, if_index;
char ifnamebuf[IFNAMSIZ];
char *if_name;
char **ap, *argv[4], *p;
const char *errstr;
switch (rtm->rtm_type) {
case RTM_IFINFO:
ifm = (struct if_msghdr *)rtm;
if_name = if_indextoname(ifm->ifm_index, ifnamebuf);
if (if_name == NULL) {
log_debug("RTM_IFINFO: lost if %d", ifm->ifm_index);
if_index = ifm->ifm_index;
frontend_imsg_compose_engine(IMSG_REMOVE_IF, 0, 0,
&if_index, sizeof(if_index));
} else {
xflags = get_xflags(if_name);
flags = get_flags(if_name);
if (!(xflags & IFXF_AUTOCONF6)) {
log_debug("RTM_IFINFO: %s(%d) no(longer) "
"autoconf6", if_name, ifm->ifm_index);
if_index = ifm->ifm_index;
frontend_imsg_compose_engine(IMSG_REMOVE_IF, 0,
0, &if_index, sizeof(if_index));
} else
update_iface(ifm->ifm_index, if_name);
}
break;
case RTM_NEWADDR:
ifm = (struct if_msghdr *)rtm;
if_name = if_indextoname(ifm->ifm_index, ifnamebuf);
log_debug("RTM_NEWADDR: %s[%u]", if_name, ifm->ifm_index);
update_iface(ifm->ifm_index, if_name);
break;
case RTM_DELADDR:
ifm = (struct if_msghdr *)rtm;
if_name = if_indextoname(ifm->ifm_index, ifnamebuf);
if (rtm->rtm_addrs & RTA_IFA && rti_info[RTAX_IFA]->sa_family
== AF_INET6) {
del_addr.if_index = ifm->ifm_index;
memcpy(&del_addr.addr, rti_info[RTAX_IFA], sizeof(
del_addr.addr));
frontend_imsg_compose_engine(IMSG_DEL_ADDRESS,
0, 0, &del_addr, sizeof(del_addr));
log_debug("RTM_DELADDR: %s[%u]", if_name,
ifm->ifm_index);
}
break;
case RTM_PROPOSAL:
ifm = (struct if_msghdr *)rtm;
if_name = if_indextoname(ifm->ifm_index, ifnamebuf);
if ((rtm->rtm_flags & (RTF_DONE | RTF_PROTO1)) ==
(RTF_DONE | RTF_PROTO1) && rtm->rtm_addrs == RTA_LABEL) {
rl = (struct sockaddr_rtlabel *)rti_info[RTAX_LABEL];
/* XXX validate rl */
p = rl->sr_label;
for (ap = argv; ap < &argv[3] && (*ap =
strsep(&p, " ")) != NULL;) {
if (**ap != '\0')
ap++;
}
*ap = NULL;
if (argv[0] != NULL && strncmp(argv[0], "slaacd:",
strlen("slaacd:")) == 0 && argv[1] != NULL &&
argv[2] != NULL && argv[3] == NULL) {
id = strtonum(argv[1], 0, INT64_MAX, &errstr);
if (errstr != NULL) {
log_warn("%s: proposal seq is %s: %s",
__func__, errstr, argv[1]);
break;
}
pid = strtonum(argv[2], 0, INT32_MAX, &errstr);
if (errstr != NULL) {
log_warn("%s: pid is %s: %s",
__func__, errstr, argv[2]);
break;
}
proposal_ack.id = id;
proposal_ack.pid = pid;
proposal_ack.if_index = ifm->ifm_index;
frontend_imsg_compose_engine(IMSG_PROPOSAL_ACK,
0, 0, &proposal_ack, sizeof(proposal_ack));
} else {
log_debug("cannot parse: %s", rl->sr_label);
}
} else {
#if 0
log_debug("%s: got flags %x, expcted %x", __func__,
rtm->rtm_flags, (RTF_DONE | RTF_PROTO1));
#endif
}
break;
default:
log_debug("unexpected RTM: %d", rtm->rtm_type);
break;
}
}
#define ROUNDUP(a) \
(((a) & (sizeof(long) - 1)) ? (1 + ((a) | (sizeof(long) - 1))) : (a))
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
get_lladdr(char *if_name, struct ether_addr *mac, struct sockaddr_in6 *ll)
{
struct ifaddrs *ifap, *ifa;
struct sockaddr_dl *sdl;
struct sockaddr_in6 *sin6;
if (getifaddrs(&ifap) != 0)
fatal("getifaddrs");
memset(mac, 0, sizeof(*mac));
memset(ll, 0, sizeof(*ll));
for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
if (strcmp(if_name, ifa->ifa_name) != 0)
continue;
switch(ifa->ifa_addr->sa_family) {
case AF_LINK:
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
if (sdl->sdl_type != IFT_ETHER ||
sdl->sdl_alen != ETHER_ADDR_LEN)
continue;
memcpy(mac->ether_addr_octet, LLADDR(sdl),
ETHER_ADDR_LEN);
break;
case AF_INET6:
sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
sin6->sin6_scope_id = ntohs(*(u_int16_t *)
&sin6->sin6_addr.s6_addr[2]);
sin6->sin6_addr.s6_addr[2] =
sin6->sin6_addr.s6_addr[3] = 0;
memcpy(ll, sin6, sizeof(*ll));
}
break;
default:
break;
}
}
freeifaddrs(ifap);
}
void
icmp6_receive(int fd, short events, void *arg)
{
struct imsg_ra ra;
struct in6_pktinfo *pi = NULL;
struct cmsghdr *cm;
ssize_t len;
int if_index = 0, *hlimp = NULL;
char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
uint8_t *p;
p = icmp6ev.answer;
if ((len = recvmsg(fd, &icmp6ev.rcvmhdr, 0)) < 0) {
log_warn("recvmsg");
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 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;
}
if ((size_t)len > sizeof(ra.packet)) {
log_warnx("invalid RA 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.if_index = if_index;
memcpy(&ra.from, &icmp6ev.from, sizeof(ra.from));
ra.len = len;
memcpy(ra.packet, icmp6ev.answer, len);
frontend_imsg_compose_engine(IMSG_RA, 0, 0, &ra, sizeof(ra));
}
void
send_solicitation(uint32_t if_index)
{
struct in6_pktinfo *pi;
struct cmsghdr *cm;
log_debug("%s(%u)", __func__, if_index);
dst.sin6_scope_id = if_index;
cm = CMSG_FIRSTHDR(&sndmhdr);
pi = (struct in6_pktinfo *)CMSG_DATA(cm);
pi->ipi6_ifindex = if_index;
if (sendmsg(icmp6sock, &sndmhdr, 0) != sizeof(rs) +
sizeof(nd_opt_hdr) + sizeof(nd_opt_source_link_addr))
log_warn("sendmsg");
}
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