2 * Copyright (C) 2012-2013 Steven Barth <steven@midlink.org>
3 * Copyright (C) 2018 Hans Dedecker <dedeckeh@gmail.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License v2 as published by
7 * the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
24 #include <arpa/inet.h>
25 #include <net/route.h>
27 #include <libubox/utils.h>
33 static void forward_router_solicitation(const struct interface
*iface
);
34 static void forward_router_advertisement(const struct interface
*iface
, uint8_t *data
, size_t len
);
36 static void handle_icmpv6(void *addr
, void *data
, size_t len
,
37 struct interface
*iface
, void *dest
);
38 static void trigger_router_advert(struct uloop_timeout
*event
);
39 static void router_netevent_cb(unsigned long event
, struct netevent_handler_info
*info
);
41 static struct netevent_handler router_netevent_handler
= { .cb
= router_netevent_cb
, };
43 static FILE *fp_route
= NULL
;
46 #define TIME_LEFT(t1, now) ((t1) != UINT32_MAX ? (t1) - (now) : UINT32_MAX)
52 if (!(fp_route
= fopen("/proc/net/ipv6_route", "r"))) {
53 syslog(LOG_ERR
, "fopen(/proc/net/ipv6_route): %m");
58 if (netlink_add_netevent_handler(&router_netevent_handler
) < 0) {
59 syslog(LOG_ERR
, "Failed to add netevent handler");
64 if (ret
< 0 && fp_route
) {
73 int router_setup_interface(struct interface
*iface
, bool enable
)
83 if ((!enable
|| iface
->ra
== MODE_DISABLED
) && iface
->router_event
.uloop
.fd
>= 0) {
85 uloop_timeout_cancel(&iface
->timer_rs
);
86 iface
->timer_rs
.cb
= NULL
;
88 trigger_router_advert(&iface
->timer_rs
);
91 uloop_fd_delete(&iface
->router_event
.uloop
);
92 close(iface
->router_event
.uloop
.fd
);
93 iface
->router_event
.uloop
.fd
= -1;
94 } else if (enable
&& iface
->ra
!= MODE_DISABLED
) {
95 struct icmp6_filter filt
;
96 struct ipv6_mreq mreq
;
99 if (iface
->router_event
.uloop
.fd
< 0) {
100 /* Open ICMPv6 socket */
101 iface
->router_event
.uloop
.fd
= socket(AF_INET6
, SOCK_RAW
| SOCK_CLOEXEC
,
103 if (iface
->router_event
.uloop
.fd
< 0) {
104 syslog(LOG_ERR
, "socket(AF_INET6): %m");
109 if (setsockopt(iface
->router_event
.uloop
.fd
, SOL_SOCKET
, SO_BINDTODEVICE
,
110 iface
->ifname
, strlen(iface
->ifname
)) < 0) {
111 syslog(LOG_ERR
, "setsockopt(SO_BINDTODEVICE): %m");
116 /* Let the kernel compute our checksums */
117 if (setsockopt(iface
->router_event
.uloop
.fd
, IPPROTO_RAW
, IPV6_CHECKSUM
,
118 &val
, sizeof(val
)) < 0) {
119 syslog(LOG_ERR
, "setsockopt(IPV6_CHECKSUM): %m");
124 /* This is required by RFC 4861 */
126 if (setsockopt(iface
->router_event
.uloop
.fd
, IPPROTO_IPV6
, IPV6_MULTICAST_HOPS
,
127 &val
, sizeof(val
)) < 0) {
128 syslog(LOG_ERR
, "setsockopt(IPV6_MULTICAST_HOPS): %m");
133 if (setsockopt(iface
->router_event
.uloop
.fd
, IPPROTO_IPV6
, IPV6_UNICAST_HOPS
,
134 &val
, sizeof(val
)) < 0) {
135 syslog(LOG_ERR
, "setsockopt(IPV6_UNICAST_HOPS): %m");
140 /* We need to know the source interface */
142 if (setsockopt(iface
->router_event
.uloop
.fd
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
,
143 &val
, sizeof(val
)) < 0) {
144 syslog(LOG_ERR
, "setsockopt(IPV6_RECVPKTINFO): %m");
149 if (setsockopt(iface
->router_event
.uloop
.fd
, IPPROTO_IPV6
, IPV6_RECVHOPLIMIT
,
150 &val
, sizeof(val
)) < 0) {
151 syslog(LOG_ERR
, "setsockopt(IPV6_RECVHOPLIMIT): %m");
156 /* Don't loop back */
158 if (setsockopt(iface
->router_event
.uloop
.fd
, IPPROTO_IPV6
, IPV6_MULTICAST_LOOP
,
159 &val
, sizeof(val
)) < 0) {
160 syslog(LOG_ERR
, "setsockopt(IPV6_MULTICAST_LOOP): %m");
165 /* Filter ICMPv6 package types */
166 ICMP6_FILTER_SETBLOCKALL(&filt
);
167 ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT
, &filt
);
168 ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT
, &filt
);
169 if (setsockopt(iface
->router_event
.uloop
.fd
, IPPROTO_ICMPV6
, ICMP6_FILTER
,
170 &filt
, sizeof(filt
)) < 0) {
171 syslog(LOG_ERR
, "setsockopt(ICMP6_FILTER): %m");
176 iface
->router_event
.handle_dgram
= handle_icmpv6
;
177 odhcpd_register(&iface
->router_event
);
179 uloop_timeout_cancel(&iface
->timer_rs
);
180 iface
->timer_rs
.cb
= NULL
;
182 memset(&mreq
, 0, sizeof(mreq
));
183 mreq
.ipv6mr_interface
= iface
->ifindex
;
184 inet_pton(AF_INET6
, ALL_IPV6_NODES
, &mreq
.ipv6mr_multiaddr
);
185 setsockopt(iface
->router_event
.uloop
.fd
, IPPROTO_IPV6
, IPV6_DROP_MEMBERSHIP
,
186 &mreq
, sizeof(mreq
));
188 inet_pton(AF_INET6
, ALL_IPV6_ROUTERS
, &mreq
.ipv6mr_multiaddr
);
189 setsockopt(iface
->router_event
.uloop
.fd
, IPPROTO_IPV6
, IPV6_DROP_MEMBERSHIP
,
190 &mreq
, sizeof(mreq
));
193 memset(&mreq
, 0, sizeof(mreq
));
194 mreq
.ipv6mr_interface
= iface
->ifindex
;
195 inet_pton(AF_INET6
, ALL_IPV6_ROUTERS
, &mreq
.ipv6mr_multiaddr
);
197 if (iface
->ra
== MODE_RELAY
&& iface
->master
) {
198 inet_pton(AF_INET6
, ALL_IPV6_NODES
, &mreq
.ipv6mr_multiaddr
);
199 forward_router_solicitation(iface
);
200 } else if (iface
->ra
== MODE_SERVER
) {
201 iface
->timer_rs
.cb
= trigger_router_advert
;
202 uloop_timeout_set(&iface
->timer_rs
, 1000);
205 if (setsockopt(iface
->router_event
.uloop
.fd
, IPPROTO_IPV6
,
206 IPV6_ADD_MEMBERSHIP
, &mreq
, sizeof(mreq
)) < 0) {
208 syslog(LOG_ERR
, "setsockopt(IPV6_ADD_MEMBERSHIP): %m");
213 if (ret
< 0 && iface
->router_event
.uloop
.fd
>= 0) {
214 close(iface
->router_event
.uloop
.fd
);
215 iface
->router_event
.uloop
.fd
= -1;
222 static void router_netevent_cb(unsigned long event
, struct netevent_handler_info
*info
)
224 struct interface
*iface
;
227 case NETEV_ROUTE6_ADD
:
228 case NETEV_ROUTE6_DEL
:
229 if (info
->rt
.dst_len
)
232 avl_for_each_element(&interfaces
, iface
, avl
) {
233 if (iface
->ra
== MODE_SERVER
&& !iface
->master
)
234 uloop_timeout_set(&iface
->timer_rs
, 1000);
237 case NETEV_ADDR6LIST_CHANGE
:
239 if (iface
&& iface
->ra
== MODE_SERVER
&& !iface
->master
)
240 uloop_timeout_set(&iface
->timer_rs
, 1000);
248 static bool router_icmpv6_valid(struct sockaddr_in6
*source
, uint8_t *data
, size_t len
)
250 struct icmp6_hdr
*hdr
= (struct icmp6_hdr
*)data
;
251 struct icmpv6_opt
*opt
, *end
= (struct icmpv6_opt
*)&data
[len
];
253 /* Hoplimit is already checked in odhcpd_receive_packets */
254 if (len
< sizeof(*hdr
) || hdr
->icmp6_code
)
257 switch (hdr
->icmp6_type
) {
258 case ND_ROUTER_ADVERT
:
259 if (!IN6_IS_ADDR_LINKLOCAL(&source
->sin6_addr
))
262 opt
= (struct icmpv6_opt
*)((struct nd_router_advert
*)data
+ 1);
265 case ND_ROUTER_SOLICIT
:
266 opt
= (struct icmpv6_opt
*)((struct nd_router_solicit
*)data
+ 1);
273 icmpv6_for_each_option(opt
, opt
, end
)
274 if (opt
->type
== ND_OPT_SOURCE_LINKADDR
&&
275 IN6_IS_ADDR_UNSPECIFIED(&source
->sin6_addr
) &&
276 hdr
->icmp6_type
== ND_ROUTER_SOLICIT
)
279 /* Check all options parsed successfully */
284 /* Detect whether a default route exists, also find the source prefixes */
285 static bool parse_routes(struct odhcpd_ipaddr
*n
, ssize_t len
)
289 char line
[512], ifname
[16];
290 bool found_default
= false;
291 struct odhcpd_ipaddr p
= { .addr
.in6
= IN6ADDR_ANY_INIT
, .prefix
= 0,
292 .dprefix
= 0, .preferred
= 0, .valid
= 0};
294 while (fgets(line
, sizeof(line
), fp_route
)) {
296 if (sscanf(line
, "00000000000000000000000000000000 00 "
297 "%*s %*s %*s %*s %*s %*s %*s %15s", ifname
) &&
298 strcmp(ifname
, "lo")) {
299 found_default
= true;
300 } else if (sscanf(line
, "%8" SCNx32
"%8" SCNx32
"%*8" SCNx32
"%*8" SCNx32
" %hhx %*s "
301 "%*s 00000000000000000000000000000000 %*s %*s %*s %" SCNx32
" lo",
302 &p
.addr
.in6
.s6_addr32
[0], &p
.addr
.in6
.s6_addr32
[1], &p
.prefix
, &rflags
) &&
303 p
.prefix
> 0 && (rflags
& RTF_NONEXTHOP
) && (rflags
& RTF_REJECT
)) {
304 // Find source prefixes by scanning through unreachable-routes
305 p
.addr
.in6
.s6_addr32
[0] = htonl(p
.addr
.in6
.s6_addr32
[0]);
306 p
.addr
.in6
.s6_addr32
[1] = htonl(p
.addr
.in6
.s6_addr32
[1]);
308 for (ssize_t i
= 0; i
< len
; ++i
) {
309 if (n
[i
].prefix
<= 64 && n
[i
].prefix
>= p
.prefix
&&
310 !odhcpd_bmemcmp(&p
.addr
.in6
, &n
[i
].addr
.in6
, p
.prefix
)) {
311 n
[i
].dprefix
= p
.prefix
;
318 return found_default
;
321 static int calc_adv_interval(struct interface
*iface
, uint32_t minvalid
,
324 uint32_t minival
= iface
->ra_mininterval
;
327 *maxival
= iface
->ra_maxinterval
;
329 if (*maxival
> minvalid
/3)
330 *maxival
= minvalid
/3;
332 if (*maxival
> MaxRtrAdvInterval
)
333 *maxival
= MaxRtrAdvInterval
;
334 else if (*maxival
< 4)
337 if (minival
< MinRtrAdvInterval
)
338 minival
= MinRtrAdvInterval
;
339 else if (minival
> (*maxival
* 3)/4)
340 minival
= (*maxival
>= 9 ? *maxival
/3 : *maxival
);
342 odhcpd_urandom(&msecs
, sizeof(msecs
));
343 msecs
= (labs(msecs
) % ((*maxival
!= minival
) ? (*maxival
- minival
)*1000 : 500)) +
349 static uint16_t calc_ra_lifetime(struct interface
*iface
, uint32_t maxival
)
351 uint16_t lifetime
= 3*maxival
;
353 if (iface
->ra_lifetime
>= 0) {
354 lifetime
= iface
->ra_lifetime
;
355 if (lifetime
< maxival
)
357 else if (lifetime
> 9000)
375 /* Router Advert server mode */
376 static uint64_t send_router_advert(struct interface
*iface
, const struct in6_addr
*from
)
378 time_t now
= odhcpd_time();
379 int mtu
= iface
->ra_mtu
;
380 int hlim
= iface
->ra_hoplimit
;
381 char buf
[INET6_ADDRSTRLEN
];
384 mtu
= odhcpd_get_interface_config(iface
->ifname
, "mtu");
390 hlim
= odhcpd_get_interface_config(iface
->ifname
, "hop_limit");
393 struct nd_router_advert h
;
394 struct icmpv6_opt lladdr
;
395 struct nd_opt_mtu mtu
;
397 .h
= {{.icmp6_type
= ND_ROUTER_ADVERT
, .icmp6_code
= 0}, 0, 0},
398 .lladdr
= {ND_OPT_SOURCE_LINKADDR
, 1, {0}},
399 .mtu
= {ND_OPT_MTU
, 1, 0, htonl(mtu
)},
403 adv
.h
.nd_ra_curhoplimit
= hlim
;
406 adv
.h
.nd_ra_flags_reserved
= ND_RA_FLAG_OTHER
;
408 if (iface
->ra_managed
>= RA_MANAGED_MFLAG
)
409 adv
.h
.nd_ra_flags_reserved
|= ND_RA_FLAG_MANAGED
;
412 if (iface
->route_preference
< 0)
413 adv
.h
.nd_ra_flags_reserved
|= ND_RA_PREF_LOW
;
414 else if (iface
->route_preference
> 0)
415 adv
.h
.nd_ra_flags_reserved
|= ND_RA_PREF_HIGH
;
417 adv
.h
.nd_ra_reachable
= htonl(iface
->ra_reachabletime
);
418 adv
.h
.nd_ra_retransmit
= htonl(iface
->ra_retranstime
);
420 odhcpd_get_mac(iface
, adv
.lladdr
.data
);
422 /* If not currently shutting down */
423 struct odhcpd_ipaddr
*addrs
= NULL
;
425 uint32_t minvalid
= UINT32_MAX
;
426 bool default_route
= false;
427 bool valid_prefix
= false;
429 /* If not shutdown */
430 if (iface
->timer_rs
.cb
) {
431 size_t size
= sizeof(*addrs
) * iface
->addr6_len
;
432 addrs
= alloca(size
);
433 memcpy(addrs
, iface
->addr6
, size
);
435 ipcnt
= iface
->addr6_len
;
437 /* Check default route */
438 if (iface
->default_router
) {
439 default_route
= true;
441 if (iface
->default_router
> 1)
443 } else if (parse_routes(addrs
, ipcnt
))
444 default_route
= true;
447 /* DNS Recursive DNS */
448 struct in6_addr dns_pref
, *dns_addr
= NULL
;
452 if (iface
->dns_cnt
> 0) {
453 dns_addr
= iface
->dns
;
454 dns_cnt
= iface
->dns_cnt
;
455 } else if (!odhcpd_get_interface_dns_addr(iface
, &dns_pref
)) {
456 dns_addr
= &dns_pref
;
461 /* Construct Prefix Information options */
463 struct nd_opt_prefix_info
*pfxs
= NULL
;
465 for (ssize_t i
= 0; i
< ipcnt
; ++i
) {
466 struct odhcpd_ipaddr
*addr
= &addrs
[i
];
467 uint32_t preferred
= 0;
470 if (addr
->prefix
> 96 || addr
->valid
<= (uint32_t)now
) {
471 syslog(LOG_INFO
, "Address %s (prefix %d, valid %u) not suitable as RA prefix on %s",
472 inet_ntop(AF_INET6
, &addr
->addr
.in6
, buf
, sizeof(buf
)), addr
->prefix
,
473 addr
->valid
, iface
->name
);
477 if (odhcpd_bmemcmp(&addr
->addr
, &iface
->pio_filter_addr
,
478 iface
->pio_filter_length
) != 0 ||
479 addr
->prefix
< iface
->pio_filter_length
) {
480 syslog(LOG_INFO
, "Address %s filtered out as RA prefix on %s",
481 inet_ntop(AF_INET6
, &addr
->addr
.in6
, buf
, sizeof(buf
)),
483 continue; /* PIO filtered out of this RA */
486 struct nd_opt_prefix_info
*p
= NULL
;
487 for (size_t i
= 0; i
< pfxs_cnt
; ++i
) {
488 if (addr
->prefix
== pfxs
[i
].nd_opt_pi_prefix_len
&&
489 !odhcpd_bmemcmp(&pfxs
[i
].nd_opt_pi_prefix
,
490 &addr
->addr
.in6
, addr
->prefix
))
495 struct nd_opt_prefix_info
*tmp
;
497 tmp
= realloc(pfxs
, sizeof(*pfxs
) * (pfxs_cnt
+ 1));
499 syslog(LOG_ERR
, "Realloc failed for RA prefix option on %s", iface
->name
);
504 p
= &pfxs
[pfxs_cnt
++];
505 memset(p
, 0, sizeof(*p
));
508 if (addr
->preferred
> (uint32_t)now
) {
509 preferred
= TIME_LEFT(addr
->preferred
, now
);
511 if (iface
->ra_useleasetime
&&
512 preferred
> iface
->dhcpv4_leasetime
)
513 preferred
= iface
->dhcpv4_leasetime
;
516 valid
= TIME_LEFT(addr
->valid
, now
);
517 if (iface
->ra_useleasetime
&& valid
> iface
->dhcpv4_leasetime
)
518 valid
= iface
->dhcpv4_leasetime
;
520 if (minvalid
> valid
)
523 if (!IN6_IS_ADDR_ULA(&addr
->addr
.in6
) || iface
->default_router
)
526 odhcpd_bmemcpy(&p
->nd_opt_pi_prefix
, &addr
->addr
.in6
,
527 (iface
->ra_advrouter
) ? 128 : addr
->prefix
);
528 p
->nd_opt_pi_type
= ND_OPT_PREFIX_INFORMATION
;
529 p
->nd_opt_pi_len
= 4;
530 p
->nd_opt_pi_prefix_len
= (addr
->prefix
< 64) ? 64 : addr
->prefix
;
531 p
->nd_opt_pi_flags_reserved
= 0;
532 if (!iface
->ra_not_onlink
)
533 p
->nd_opt_pi_flags_reserved
|= ND_OPT_PI_FLAG_ONLINK
;
534 if (iface
->ra_managed
< RA_MANAGED_NO_AFLAG
&& addr
->prefix
<= 64)
535 p
->nd_opt_pi_flags_reserved
|= ND_OPT_PI_FLAG_AUTO
;
536 if (iface
->ra_advrouter
)
537 p
->nd_opt_pi_flags_reserved
|= ND_OPT_PI_FLAG_RADDR
;
538 p
->nd_opt_pi_preferred_time
= htonl(preferred
);
539 p
->nd_opt_pi_valid_time
= htonl(valid
);
542 /* Calculate periodic transmit */
544 int msecs
= calc_adv_interval(iface
, minvalid
, &maxival
);
548 syslog(LOG_WARNING
, "A default route is present but there is no public prefix "
549 "on %s thus we don't announce a default route!", iface
->name
);
550 adv
.h
.nd_ra_router_lifetime
= 0;
552 adv
.h
.nd_ra_router_lifetime
= htons(calc_ra_lifetime(iface
, maxival
));
555 adv
.h
.nd_ra_router_lifetime
= 0;
557 syslog(LOG_INFO
, "Using a RA lifetime of %d seconds on %s", ntohs(adv
.h
.nd_ra_router_lifetime
), iface
->name
);
565 } dns
= {ND_OPT_RECURSIVE_DNS
, (1 + (2 * dns_cnt
)), 0, 0, 0};
567 /* DNS Search options */
568 uint8_t *search_domain
= NULL
;
569 size_t search_len
= 0, search_padded
= 0;
572 search_len
= iface
->search_len
;
573 search_domain
= iface
->search
;
575 if (!search_domain
&& !res_init() && _res
.dnsrch
[0] && _res
.dnsrch
[0][0]) {
576 uint8_t search_buf
[256];
578 int len
= dn_comp(_res
.dnsrch
[0], search_buf
,
579 sizeof(search_buf
), NULL
, NULL
);
581 search_domain
= search_buf
;
588 search_padded
= ((search_len
+ 7) & (~7)) + 8;
597 } *search
= alloca(sizeof(*search
) + search_padded
);
599 search
->type
= ND_OPT_DNS_SEARCH
;
600 search
->len
= search_len
? ((sizeof(*search
) + search_padded
) / 8) : 0;
604 if (search_len
> 0) {
605 memcpy(search
->name
, search_domain
, search_len
);
606 memset(&search
->name
[search_len
], 0, search_padded
- search_len
);
609 size_t routes_cnt
= 0;
617 } *tmp
, *routes
= NULL
;
619 for (ssize_t i
= 0; i
< ipcnt
; ++i
) {
620 struct odhcpd_ipaddr
*addr
= &addrs
[i
];
621 if (addr
->dprefix
> 64 || addr
->dprefix
== 0 || addr
->valid
<= (uint32_t)now
) {
622 syslog(LOG_INFO
, "Address %s (dprefix %d, valid %u) not suitable as RA route on %s",
623 inet_ntop(AF_INET6
, &addr
->addr
.in6
, buf
, sizeof(buf
)),
624 addr
->dprefix
, addr
->valid
, iface
->name
);
626 continue; /* Address not suitable */
629 if (odhcpd_bmemcmp(&addr
->addr
, &iface
->pio_filter_addr
,
630 iface
->pio_filter_length
) != 0 ||
631 addr
->prefix
< iface
->pio_filter_length
) {
632 syslog(LOG_INFO
, "Address %s filtered out as RA route on %s",
633 inet_ntop(AF_INET6
, &addr
->addr
.in6
, buf
, sizeof(buf
)),
635 continue; /* PIO filtered out of this RA */
638 if (addr
->dprefix
> 32) {
639 addr
->addr
.in6
.s6_addr32
[1] &= htonl(~((1U << (64 - addr
->dprefix
)) - 1));
640 } else if (addr
->dprefix
<= 32) {
641 addr
->addr
.in6
.s6_addr32
[0] &= htonl(~((1U << (32 - addr
->dprefix
)) - 1));
642 addr
->addr
.in6
.s6_addr32
[1] = 0;
645 tmp
= realloc(routes
, sizeof(*routes
) * (routes_cnt
+ 1));
647 syslog(LOG_ERR
, "Realloc failed for RA route option on %s", iface
->name
);
653 memset(&routes
[routes_cnt
], 0, sizeof(*routes
));
654 routes
[routes_cnt
].type
= ND_OPT_ROUTE_INFO
;
655 routes
[routes_cnt
].len
= sizeof(*routes
) / 8;
656 routes
[routes_cnt
].prefix
= addr
->dprefix
;
657 routes
[routes_cnt
].flags
= 0;
658 if (iface
->route_preference
< 0)
659 routes
[routes_cnt
].flags
|= ND_RA_PREF_LOW
;
660 else if (iface
->route_preference
> 0)
661 routes
[routes_cnt
].flags
|= ND_RA_PREF_HIGH
;
662 routes
[routes_cnt
].lifetime
= htonl(TIME_LEFT(addr
->valid
, now
));
663 routes
[routes_cnt
].addr
[0] = addr
->addr
.in6
.s6_addr32
[0];
664 routes
[routes_cnt
].addr
[1] = addr
->addr
.in6
.s6_addr32
[1];
665 routes
[routes_cnt
].addr
[2] = 0;
666 routes
[routes_cnt
].addr
[3] = 0;
671 search
->lifetime
= htonl(maxival
*10);
672 dns
.lifetime
= search
->lifetime
;
674 struct icmpv6_opt adv_interval
= {
675 .type
= ND_OPT_RTR_ADV_INTERVAL
,
677 .data
= {0, 0, (maxival
*1000) >> 24, (maxival
*1000) >> 16, (maxival
*1000) >> 8, maxival
*1000}
680 struct iovec iov
[IOV_RA_TOTAL
] = {
681 [IOV_RA_ADV
] = {&adv
, sizeof(adv
)},
682 [IOV_RA_PFXS
] = {pfxs
, pfxs_cnt
* sizeof(*pfxs
)},
683 [IOV_RA_ROUTES
] = {routes
, routes_cnt
* sizeof(*routes
)},
684 [IOV_RA_DNS
] = {&dns
, (dns_cnt
) ? sizeof(dns
) : 0},
685 [IOV_RA_DNS_ADDR
] = {dns_addr
, dns_cnt
* sizeof(*dns_addr
)},
686 [IOV_RA_SEARCH
] = {search
, search
->len
* 8},
687 [IOV_RA_ADV_INTERVAL
] = {&adv_interval
, adv_interval
.len
* 8}};
688 struct sockaddr_in6 dest
;
690 memset(&dest
, 0, sizeof(dest
));
691 dest
.sin6_family
= AF_INET6
;
693 if (from
&& !IN6_IS_ADDR_UNSPECIFIED(from
))
694 dest
.sin6_addr
= *from
;
696 inet_pton(AF_INET6
, ALL_IPV6_NODES
, &dest
.sin6_addr
);
698 syslog(LOG_NOTICE
, "Sending a RA on %s", iface
->name
);
700 odhcpd_send(iface
->router_event
.uloop
.fd
, &dest
, iov
, ARRAY_SIZE(iov
), iface
);
709 static void trigger_router_advert(struct uloop_timeout
*event
)
711 struct interface
*iface
= container_of(event
, struct interface
, timer_rs
);
712 int msecs
= send_router_advert(iface
, NULL
);
714 /* Rearm timer if not shut down */
716 uloop_timeout_set(event
, msecs
);
720 /* Event handler for incoming ICMPv6 packets */
721 static void handle_icmpv6(void *addr
, void *data
, size_t len
,
722 struct interface
*iface
, _unused
void *dest
)
724 struct icmp6_hdr
*hdr
= data
;
725 struct sockaddr_in6
*from
= addr
;
727 if (!router_icmpv6_valid(addr
, data
, len
))
730 if ((iface
->ra
== MODE_SERVER
&& !iface
->master
)) { /* Server mode */
731 if (hdr
->icmp6_type
== ND_ROUTER_SOLICIT
)
732 send_router_advert(iface
, &from
->sin6_addr
);
733 } else if (iface
->ra
== MODE_RELAY
) { /* Relay mode */
734 if (hdr
->icmp6_type
== ND_ROUTER_SOLICIT
&& !iface
->master
) {
737 avl_for_each_element(&interfaces
, c
, avl
) {
738 if (!c
->master
|| c
->ra
!= MODE_RELAY
)
741 forward_router_solicitation(c
);
743 } else if (hdr
->icmp6_type
== ND_ROUTER_ADVERT
&& iface
->master
)
744 forward_router_advertisement(iface
, data
, len
);
749 /* Forward router solicitation */
750 static void forward_router_solicitation(const struct interface
*iface
)
752 struct icmp6_hdr rs
= {ND_ROUTER_SOLICIT
, 0, 0, {{0}}};
753 struct iovec iov
= {&rs
, sizeof(rs
)};
754 struct sockaddr_in6 all_routers
;
759 memset(&all_routers
, 0, sizeof(all_routers
));
760 all_routers
.sin6_family
= AF_INET6
;
761 inet_pton(AF_INET6
, ALL_IPV6_ROUTERS
, &all_routers
.sin6_addr
);
762 all_routers
.sin6_scope_id
= iface
->ifindex
;
764 syslog(LOG_NOTICE
, "Sending RS to %s", iface
->name
);
765 odhcpd_send(iface
->router_event
.uloop
.fd
, &all_routers
, &iov
, 1, iface
);
769 /* Handler for incoming router solicitations on slave interfaces */
770 static void forward_router_advertisement(const struct interface
*iface
, uint8_t *data
, size_t len
)
772 struct nd_router_advert
*adv
= (struct nd_router_advert
*)data
;
773 struct sockaddr_in6 all_nodes
;
774 struct icmpv6_opt
*opt
;
776 struct iovec iov
= { .iov_base
= data
, .iov_len
= len
};
777 /* Rewrite options */
778 uint8_t *end
= data
+ len
;
779 uint8_t *mac_ptr
= NULL
;
780 struct in6_addr
*dns_ptr
= NULL
;
781 size_t dns_count
= 0;
783 icmpv6_for_each_option(opt
, &adv
[1], end
) {
784 if (opt
->type
== ND_OPT_SOURCE_LINKADDR
) {
785 /* Store address of source MAC-address */
787 } else if (opt
->type
== ND_OPT_RECURSIVE_DNS
&& opt
->len
> 1) {
788 /* Check if we have to rewrite DNS */
789 dns_ptr
= (struct in6_addr
*)&opt
->data
[6];
790 dns_count
= (opt
->len
- 1) / 2;
794 syslog(LOG_NOTICE
, "Got a RA on %s", iface
->name
);
796 /* Indicate a proxy, however we don't follow the rest of RFC 4389 yet */
797 adv
->nd_ra_flags_reserved
|= ND_RA_FLAG_PROXY
;
799 /* Forward advertisement to all slave interfaces */
800 memset(&all_nodes
, 0, sizeof(all_nodes
));
801 all_nodes
.sin6_family
= AF_INET6
;
802 inet_pton(AF_INET6
, ALL_IPV6_NODES
, &all_nodes
.sin6_addr
);
804 avl_for_each_element(&interfaces
, c
, avl
) {
805 if (c
->ra
!= MODE_RELAY
|| c
->master
)
808 /* Fixup source hardware address option */
810 odhcpd_get_mac(c
, mac_ptr
);
812 /* If we have to rewrite DNS entries */
813 if (c
->always_rewrite_dns
&& dns_ptr
&& dns_count
> 0) {
814 const struct in6_addr
*rewrite
= c
->dns
;
815 struct in6_addr addr
;
816 size_t rewrite_cnt
= c
->dns_cnt
;
818 if (rewrite_cnt
== 0) {
819 if (odhcpd_get_interface_dns_addr(c
, &addr
))
820 continue; /* Unable to comply */
826 /* Copy over any other addresses */
827 for (size_t i
= 0; i
< dns_count
; ++i
) {
828 size_t j
= (i
< rewrite_cnt
) ? i
: rewrite_cnt
- 1;
829 dns_ptr
[i
] = rewrite
[j
];
833 syslog(LOG_NOTICE
, "Forward a RA on %s", c
->name
);
835 odhcpd_send(c
->router_event
.uloop
.fd
, &all_nodes
, &iov
, 1, c
);