2 * Copyright (C) 2014 John Crispin <blogic@openwrt.org>
3 * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License version 2.1
7 * as published by 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.
16 #include <sys/socket.h>
17 #include <sys/ioctl.h>
18 #include <sys/types.h>
20 #include <sys/utsname.h>
22 #include <netinet/in.h>
23 #include <arpa/inet.h>
24 #include <sys/types.h>
33 #include <libubox/usock.h>
34 #include <libubox/uloop.h>
35 #include <libubox/avl-cmp.h>
36 #include <libubox/utils.h>
37 #include "interface.h"
44 interface_send_packet4(struct interface
*iface
, struct sockaddr_in
*to
, struct iovec
*iov
, int iov_len
)
46 static size_t cmsg_data
[( CMSG_SPACE(sizeof(struct in_pktinfo
)) / sizeof(size_t)) + 1];
47 static struct sockaddr_in a
;
48 static struct msghdr m
= {
49 .msg_name
= (struct sockaddr
*) &a
,
50 .msg_namelen
= sizeof(a
),
51 .msg_control
= cmsg_data
,
52 .msg_controllen
= CMSG_LEN(sizeof(struct in_pktinfo
)),
54 struct in_pktinfo
*pkti
;
56 int fd
= iface
->fd
.fd
;
58 a
.sin_family
= AF_INET
;
59 a
.sin_port
= htons(MCAST_PORT
);
61 m
.msg_iovlen
= iov_len
;
63 memset(cmsg_data
, 0, sizeof(cmsg_data
));
64 cmsg
= CMSG_FIRSTHDR(&m
);
65 cmsg
->cmsg_len
= m
.msg_controllen
;
66 cmsg
->cmsg_level
= IPPROTO_IP
;
67 cmsg
->cmsg_type
= IP_PKTINFO
;
69 pkti
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
70 pkti
->ipi_ifindex
= iface
->ifindex
;
72 if (iface
->multicast
) {
73 a
.sin_addr
.s_addr
= inet_addr(MCAST_ADDR
);
75 fprintf(stderr
, "Ignoring IPv4 address for multicast interface\n");
77 a
.sin_addr
.s_addr
= to
->sin_addr
.s_addr
;
80 return sendmsg(fd
, &m
, 0);
84 interface_send_packet6(struct interface
*iface
, struct sockaddr_in6
*to
, struct iovec
*iov
, int iov_len
)
86 static size_t cmsg_data
[( CMSG_SPACE(sizeof(struct in6_pktinfo
)) / sizeof(size_t)) + 1];
87 static struct sockaddr_in6 a
;
88 static struct msghdr m
= {
89 .msg_name
= (struct sockaddr
*) &a
,
90 .msg_namelen
= sizeof(a
),
91 .msg_control
= cmsg_data
,
92 .msg_controllen
= CMSG_LEN(sizeof(struct in6_pktinfo
)),
94 struct in6_pktinfo
*pkti
;
96 int fd
= iface
->fd
.fd
;
98 a
.sin6_family
= AF_INET6
;
99 a
.sin6_port
= htons(MCAST_PORT
);
101 m
.msg_iovlen
= iov_len
;
103 memset(cmsg_data
, 0, sizeof(cmsg_data
));
104 cmsg
= CMSG_FIRSTHDR(&m
);
105 cmsg
->cmsg_len
= m
.msg_controllen
;
106 cmsg
->cmsg_level
= IPPROTO_IPV6
;
107 cmsg
->cmsg_type
= IPV6_PKTINFO
;
109 pkti
= (struct in6_pktinfo
*) CMSG_DATA(cmsg
);
110 pkti
->ipi6_ifindex
= iface
->ifindex
;
112 if (iface
->multicast
) {
113 inet_pton(AF_INET6
, MCAST_ADDR6
, &a
.sin6_addr
);
115 fprintf(stderr
, "Ignoring IPv6 address for multicast interface\n");
117 a
.sin6_addr
= to
->sin6_addr
;
120 return sendmsg(fd
, &m
, 0);
124 interface_send_packet(struct interface
*iface
, struct sockaddr
*to
, struct iovec
*iov
, int iov_len
)
126 if (!iface
->multicast
&& !to
) {
127 fprintf(stderr
, "No IP address specified for unicast interface\n");
133 fprintf(stderr
, "TX ipv%d: %s\n", iface
->v6
* 2 + 4, iface
->name
);
134 fprintf(stderr
, " multicast: %d\n", iface
->multicast
);
138 return interface_send_packet6(iface
, (struct sockaddr_in6
*)to
, iov
, iov_len
);
140 return interface_send_packet4(iface
, (struct sockaddr_in
*)to
, iov
, iov_len
);
143 static void interface_close(struct interface
*iface
)
145 if (iface
->fd
.fd
< 0)
148 announce_free(iface
);
149 uloop_fd_delete(&iface
->fd
);
154 static void interface_free(struct interface
*iface
)
156 interface_close(iface
);
161 interface_valid_src(void *ip1
, void *mask
, void *ip2
, int len
)
171 for (i
= 0; i
< len
; i
++, i1
++, i2
++, m
++) {
172 if ((*i1
& *m
) != (*i2
& *m
))
180 read_socket4(struct uloop_fd
*u
, unsigned int events
)
182 struct interface
*iface
= container_of(u
, struct interface
, fd
);
183 static uint8_t buffer
[8 * 1024];
185 char cmsg
[CMSG_SPACE(sizeof(struct in_pktinfo
)) + CMSG_SPACE(sizeof(int)) + 1];
186 struct cmsghdr
*cmsgptr
;
189 struct sockaddr_in from
;
190 int flags
= 0, ifindex
= -1;
192 struct in_pktinfo
*inp
= NULL
;
195 interface_close(iface
);
196 uloop_timeout_set(&iface
->reconnect
, 1000);
200 iov
[0].iov_base
= buffer
;
201 iov
[0].iov_len
= sizeof(buffer
);
203 memset(&msg
, 0, sizeof(msg
));
204 msg
.msg_name
= (struct sockaddr
*) &from
;
205 msg
.msg_namelen
= sizeof(struct sockaddr_in
);
208 msg
.msg_control
= &cmsg
;
209 msg
.msg_controllen
= sizeof(cmsg
);
211 len
= recvmsg(u
->fd
, &msg
, flags
);
213 perror("read failed");
216 for (cmsgptr
= CMSG_FIRSTHDR(&msg
); cmsgptr
!= NULL
; cmsgptr
= CMSG_NXTHDR(&msg
, cmsgptr
)) {
217 void *c
= CMSG_DATA(cmsgptr
);
219 switch (cmsgptr
->cmsg_type
) {
221 inp
= ((struct in_pktinfo
*) c
);
225 ttl
= (uint8_t) *((int *) c
);
229 fprintf(stderr
, "unknown cmsg %x\n", cmsgptr
->cmsg_type
);
240 fprintf(stderr
, "RX ipv4: %s\n", iface
->name
);
241 fprintf(stderr
, " multicast: %d\n", iface
->multicast
);
242 inet_ntop(AF_INET
, &from
.sin_addr
, buf
, 256);
243 fprintf(stderr
, " src %s:%d\n", buf
, from
.sin_port
);
244 inet_ntop(AF_INET
, &inp
->ipi_spec_dst
, buf
, 256);
245 fprintf(stderr
, " dst %s\n", buf
);
246 inet_ntop(AF_INET
, &inp
->ipi_addr
, buf
, 256);
247 fprintf(stderr
, " real %s\n", buf
);
250 if (inp
->ipi_ifindex
!= iface
->ifindex
)
251 fprintf(stderr
, "invalid iface index %d != %d\n", ifindex
, iface
->ifindex
);
252 else if (!interface_valid_src((void *) &iface
->v4_addr
, (void *) &iface
->v4_netmask
, (void *) &from
.sin_addr
, 4))
253 dns_handle_packet(iface
, (struct sockaddr
*) &from
, from
.sin_port
, buffer
, len
);
257 read_socket6(struct uloop_fd
*u
, unsigned int events
)
259 struct interface
*iface
= container_of(u
, struct interface
, fd
);
260 static uint8_t buffer
[8 * 1024];
262 char cmsg6
[CMSG_SPACE(sizeof(struct in6_pktinfo
)) + CMSG_SPACE(sizeof(int)) + 1];
263 struct cmsghdr
*cmsgptr
;
266 struct sockaddr_in6 from
;
267 int flags
= 0, ifindex
= -1;
269 struct in6_pktinfo
*inp
= NULL
;
272 interface_close(iface
);
273 uloop_timeout_set(&iface
->reconnect
, 1000);
277 iov
[0].iov_base
= buffer
;
278 iov
[0].iov_len
= sizeof(buffer
);
280 memset(&msg
, 0, sizeof(msg
));
281 msg
.msg_name
= (struct sockaddr
*) &from
;
282 msg
.msg_namelen
= sizeof(struct sockaddr_in6
);
285 msg
.msg_control
= &cmsg6
;
286 msg
.msg_controllen
= sizeof(cmsg6
);
288 len
= recvmsg(u
->fd
, &msg
, flags
);
290 perror("read failed");
293 for (cmsgptr
= CMSG_FIRSTHDR(&msg
); cmsgptr
!= NULL
; cmsgptr
= CMSG_NXTHDR(&msg
, cmsgptr
)) {
294 void *c
= CMSG_DATA(cmsgptr
);
296 switch (cmsgptr
->cmsg_type
) {
298 inp
= ((struct in6_pktinfo
*) c
);
302 ttl
= (uint8_t) *((int *) c
);
306 fprintf(stderr
, "unknown cmsg %x\n", cmsgptr
->cmsg_type
);
317 fprintf(stderr
, "RX ipv6: %s\n", iface
->name
);
318 fprintf(stderr
, " multicast: %d\n", iface
->multicast
);
319 inet_ntop(AF_INET6
, &from
.sin6_addr
, buf
, 256);
320 fprintf(stderr
, " src %s:%d\n", buf
, from
.sin6_port
);
321 inet_ntop(AF_INET6
, &inp
->ipi6_addr
, buf
, 256);
322 fprintf(stderr
, " dst %s\n", buf
);
325 if (inp
->ipi6_ifindex
!= iface
->ifindex
)
326 fprintf(stderr
, "invalid iface index %d != %d\n", ifindex
, iface
->ifindex
);
327 else if (!interface_valid_src((void *) &iface
->v6_addr
, (void *) &iface
->v6_netmask
, (void *) &from
.sin6_addr
, 16))
328 dns_handle_packet(iface
, (struct sockaddr
*) &from
, from
.sin6_port
, buffer
, len
);
332 interface_mcast_setup4(struct interface
*iface
)
334 struct ip_mreqn mreq
;
337 struct sockaddr_in sa
= { 0 };
338 int fd
= iface
->fd
.fd
;
340 sa
.sin_family
= AF_INET
;
341 sa
.sin_port
= htons(MCAST_PORT
);
342 inet_pton(AF_INET
, MCAST_ADDR
, &sa
.sin_addr
);
344 memset(&mreq
, 0, sizeof(mreq
));
345 mreq
.imr_address
.s_addr
= iface
->v4_addr
.s_addr
;
346 mreq
.imr_multiaddr
= sa
.sin_addr
;
347 mreq
.imr_ifindex
= iface
->ifindex
;
349 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_TTL
, &ttl
, sizeof(ttl
)) < 0)
350 fprintf(stderr
, "ioctl failed: IP_MULTICAST_TTL\n");
352 /* Some network drivers have issues with dropping membership of
353 * mcast groups when the iface is down, but don't allow rejoining
354 * when it comes back up. This is an ugly workaround
355 * -- this was copied from avahi --
357 setsockopt(fd
, IPPROTO_IP
, IP_DROP_MEMBERSHIP
, &mreq
, sizeof(mreq
));
359 if (setsockopt(fd
, IPPROTO_IP
, IP_ADD_MEMBERSHIP
, &mreq
, sizeof(mreq
)) < 0) {
360 fprintf(stderr
, "failed to join multicast group: %s\n", strerror(errno
));
366 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_LOOP
, &no
, sizeof(no
)) < 0)
367 fprintf(stderr
, "ioctl failed: IP_MULTICAST_LOOP\n");
373 interface_socket_setup6(struct interface
*iface
)
375 struct ipv6_mreq mreq
;
378 struct sockaddr_in6 sa
= { 0 };
379 int fd
= iface
->fd
.fd
;
381 sa
.sin6_family
= AF_INET6
;
382 sa
.sin6_port
= htons(MCAST_PORT
);
383 inet_pton(AF_INET6
, MCAST_ADDR6
, &sa
.sin6_addr
);
385 memset(&mreq
, 0, sizeof(mreq
));
386 mreq
.ipv6mr_multiaddr
= sa
.sin6_addr
;
387 mreq
.ipv6mr_interface
= iface
->ifindex
;
389 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_MULTICAST_HOPS
, &ttl
, sizeof(ttl
)) < 0)
390 fprintf(stderr
, "ioctl failed: IPV6_MULTICAST_HOPS\n");
392 setsockopt(fd
, IPPROTO_IPV6
, IPV6_LEAVE_GROUP
, &mreq
, sizeof(mreq
));
393 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_ADD_MEMBERSHIP
, &mreq
, sizeof(mreq
)) < 0) {
394 fprintf(stderr
, "failed to join multicast group: %s\n", strerror(errno
));
400 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_MULTICAST_LOOP
, &no
, sizeof(no
)) < 0)
401 fprintf(stderr
, "ioctl failed: IPV6_MULTICAST_LOOP\n");
407 reconnect_socket4(struct uloop_timeout
*timeout
)
409 struct interface
*iface
= container_of(timeout
, struct interface
, reconnect
);
413 iface
->fd
.fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
| USOCK_IPV4ONLY
,
414 (iface
->multicast
) ? (iface
->mcast_addr
) : (iface
->v4_addrs
), "5353");
415 if (iface
->fd
.fd
< 0) {
416 fprintf(stderr
, "failed to add listener %s: %s\n", iface
->mcast_addr
, strerror(errno
));
420 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_BINDTODEVICE
, iface
->name
, strlen(iface
->name
) < 0))
421 fprintf(stderr
, "ioctl failed: SO_BINDTODEVICE\n");
423 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_REUSEADDR
, &yes
, sizeof(yes
)) < 0)
424 fprintf(stderr
, "ioctl failed: SO_REUSEADDR\n");
426 if (setsockopt(iface
->fd
.fd
, IPPROTO_IP
, IP_TTL
, &ttl
, sizeof(ttl
)) < 0)
427 fprintf(stderr
, "ioctl failed: IP_TTL\n");
429 if (setsockopt(iface
->fd
.fd
, IPPROTO_IP
, IP_RECVTTL
, &yes
, sizeof(yes
)) < 0)
430 fprintf(stderr
, "ioctl failed: IP_RECVTTL\n");
432 if (setsockopt(iface
->fd
.fd
, IPPROTO_IP
, IP_PKTINFO
, &yes
, sizeof(yes
)) < 0)
433 fprintf(stderr
, "ioctl failed: IP_PKTINFO\n");
435 if (iface
->multicast
&& interface_mcast_setup4(iface
)) {
440 uloop_fd_add(&iface
->fd
, ULOOP_READ
);
441 if (iface
->multicast
) {
442 dns_send_question(iface
, "_services._dns-sd._udp.local", TYPE_PTR
, 0);
443 announce_init(iface
);
449 uloop_timeout_set(timeout
, 1000);
453 reconnect_socket6(struct uloop_timeout
*timeout
)
455 struct interface
*iface
= container_of(timeout
, struct interface
, reconnect
);
456 char mcast_addr
[128];
460 snprintf(mcast_addr
, sizeof(mcast_addr
), "%s%%%s", (iface
->multicast
) ? (iface
->mcast_addr
) : (iface
->v6_addrs
), iface
->name
);
461 iface
->fd
.fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
| USOCK_IPV6ONLY
, mcast_addr
, "5353");
462 if (iface
->fd
.fd
< 0) {
463 fprintf(stderr
, "failed to add listener %s: %s\n", mcast_addr
, strerror(errno
));
467 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_BINDTODEVICE
, iface
->name
, strlen(iface
->name
) < 0))
468 fprintf(stderr
, "ioctl failed: SO_BINDTODEVICE\n");
470 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_UNICAST_HOPS
, &ttl
, sizeof(ttl
)) < 0)
471 fprintf(stderr
, "ioctl failed: IPV6_UNICAST_HOPS\n");
473 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &yes
, sizeof(yes
)) < 0)
474 fprintf(stderr
, "ioctl failed: IPV6_RECVPKTINFO\n");
476 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_RECVHOPLIMIT
, &yes
, sizeof(yes
)) < 0)
477 fprintf(stderr
, "ioctl failed: IPV6_RECVHOPLIMIT\n");
479 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_REUSEADDR
, &yes
, sizeof(yes
)) < 0)
480 fprintf(stderr
, "ioctl failed: SO_REUSEADDR\n");
482 if (iface
->multicast
&& interface_socket_setup6(iface
)) {
487 uloop_fd_add(&iface
->fd
, ULOOP_READ
);
489 if (iface
->multicast
) {
490 dns_send_question(iface
, "_services._dns-sd._udp.local", TYPE_PTR
, 0);
491 announce_init(iface
);
497 uloop_timeout_set(timeout
, 1000);
501 static void interface_start(struct interface
*iface
)
504 iface
->fd
.cb
= read_socket6
;
505 iface
->reconnect
.cb
= reconnect_socket6
;
507 iface
->fd
.cb
= read_socket4
;
508 iface
->reconnect
.cb
= reconnect_socket4
;
510 uloop_timeout_set(&iface
->reconnect
, 100);
514 iface_update_cb(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
515 struct vlist_node
*node_old
)
517 struct interface
*iface
;
520 iface
= container_of(node_old
, struct interface
, node
);
521 interface_free(iface
);
525 iface
= container_of(node_new
, struct interface
, node
);
526 interface_start(iface
);
530 static struct interface
* _interface_add(const char *name
, int multicast
, int v6
)
532 struct interface
*iface
;
536 iface
= calloc_a(sizeof(*iface
),
537 &name_buf
, strlen(name
) + 1,
538 &id_buf
, strlen(name
) + 5);
540 sprintf(id_buf
, "%d_%d_%s", multicast
, v6
, name
);
541 iface
->name
= strcpy(name_buf
, name
);
543 iface
->ifindex
= if_nametoindex(name
);
545 iface
->multicast
= multicast
;
548 iface
->mcast_addr
= MCAST_ADDR6
;
550 iface
->mcast_addr
= MCAST_ADDR
;
552 if (iface
->ifindex
<= 0)
555 vlist_add(&interfaces
, &iface
->node
, iface
->id
);
563 int interface_add(const char *name
)
565 struct interface
*v4
= NULL
, *v6
= NULL
, *unicast
;
566 struct ifaddrs
*ifap
, *ifa
;
570 for (ifa
= ifap
; ifa
; ifa
= ifa
->ifa_next
) {
571 if (strcmp(ifa
->ifa_name
, name
))
573 if (ifa
->ifa_addr
->sa_family
== AF_INET
&& !v4
) {
574 struct sockaddr_in
*sa
;
576 if (cfg_proto
&& (cfg_proto
!= 4))
579 unicast
= _interface_add(name
, 0, 0);
582 v4
= _interface_add(name
, 1, 0);
586 sa
= (struct sockaddr_in
*) ifa
->ifa_addr
;
587 memcpy(&v4
->v4_addr
, &sa
->sin_addr
, sizeof(v4
->v4_addr
));
588 memcpy(&unicast
->v4_addr
, &sa
->sin_addr
, sizeof(unicast
->v4_addr
));
590 inet_ntop(AF_INET
, &sa
->sin_addr
, v4
->v4_addrs
, sizeof(v4
->v4_addrs
));
591 inet_ntop(AF_INET
, &sa
->sin_addr
, unicast
->v4_addrs
, sizeof(unicast
->v4_addrs
));
593 sa
= (struct sockaddr_in
*) ifa
->ifa_netmask
;
594 memcpy(&unicast
->v4_netmask
, &sa
->sin_addr
, sizeof(unicast
->v4_netmask
));
595 memcpy(&v4
->v4_netmask
, &sa
->sin_addr
, sizeof(v4
->v4_netmask
));
601 if (ifa
->ifa_addr
->sa_family
== AF_INET6
&& !v6
) {
602 uint8_t ll_prefix
[] = {0xfe, 0x80 };
603 struct sockaddr_in6
*sa6
;
605 if (cfg_proto
&& (cfg_proto
!= 6))
608 sa6
= (struct sockaddr_in6
*) ifa
->ifa_addr
;
609 if (memcmp(&sa6
->sin6_addr
, &ll_prefix
, 2))
612 unicast
= _interface_add(name
, 0, 1);
615 v6
= _interface_add(name
, 1, 1);
619 memcpy(&v6
->v6_addr
, &sa6
->sin6_addr
, sizeof(v6
->v6_addr
));
620 memcpy(&unicast
->v6_addr
, &sa6
->sin6_addr
, sizeof(unicast
->v6_addr
));
622 inet_ntop(AF_INET6
, &sa6
->sin6_addr
, v6
->v6_addrs
, sizeof(v6
->v6_addrs
));
623 inet_ntop(AF_INET6
, &sa6
->sin6_addr
, unicast
->v6_addrs
, sizeof(unicast
->v6_addrs
));
625 sa6
= (struct sockaddr_in6
*) ifa
->ifa_netmask
;
626 memcpy(&v6
->v6_netmask
, &sa6
->sin6_addr
, sizeof(v6
->v6_netmask
));
627 memcpy(&unicast
->v6_netmask
, &sa6
->sin6_addr
, sizeof(unicast
->v6_netmask
));
639 void interface_shutdown(void)
641 struct interface
*iface
;
643 vlist_for_each_element(&interfaces
, iface
, node
)
644 if (iface
->fd
.fd
> 0 && iface
->multicast
) {
645 dns_reply_a(iface
, NULL
, 0);
646 service_announce_services(iface
, NULL
, 0);
648 vlist_for_each_element(&interfaces
, iface
, node
)
649 interface_close(iface
);
653 interface_get(const char *name
, int v6
, int multicast
)
656 snprintf(id_buf
, sizeof(id_buf
), "%d_%d_%s", multicast
, v6
, name
);
657 struct interface
*iface
= vlist_find(&interfaces
, id_buf
, iface
, node
);
661 VLIST_TREE(interfaces
, avl_strcmp
, iface_update_cb
, false, false);