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>
38 #include "interface.h"
45 interface_send_packet4(struct interface
*iface
, struct sockaddr_in
*to
, struct iovec
*iov
, int iov_len
)
47 static size_t cmsg_data
[( CMSG_SPACE(sizeof(struct in_pktinfo
)) / sizeof(size_t)) + 1];
48 static struct sockaddr_in a
;
49 static struct msghdr m
= {
50 .msg_name
= (struct sockaddr
*) &a
,
51 .msg_namelen
= sizeof(a
),
52 .msg_control
= cmsg_data
,
53 .msg_controllen
= CMSG_LEN(sizeof(struct in_pktinfo
)),
55 struct in_pktinfo
*pkti
;
57 int fd
= iface
->fd
.fd
;
59 a
.sin_family
= AF_INET
;
60 a
.sin_port
= htons(MCAST_PORT
);
62 m
.msg_iovlen
= iov_len
;
64 memset(cmsg_data
, 0, sizeof(cmsg_data
));
65 cmsg
= CMSG_FIRSTHDR(&m
);
66 cmsg
->cmsg_len
= m
.msg_controllen
;
67 cmsg
->cmsg_level
= IPPROTO_IP
;
68 cmsg
->cmsg_type
= IP_PKTINFO
;
70 pkti
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
71 pkti
->ipi_ifindex
= iface
->ifindex
;
73 if (iface
->multicast
) {
74 a
.sin_addr
.s_addr
= inet_addr(MCAST_ADDR
);
76 fprintf(stderr
, "Ignoring IPv4 address for multicast interface\n");
78 a
.sin_addr
.s_addr
= to
->sin_addr
.s_addr
;
81 return sendmsg(fd
, &m
, 0);
85 interface_send_packet6(struct interface
*iface
, struct sockaddr_in6
*to
, struct iovec
*iov
, int iov_len
)
87 static size_t cmsg_data
[( CMSG_SPACE(sizeof(struct in6_pktinfo
)) / sizeof(size_t)) + 1];
88 static struct sockaddr_in6 a
;
89 static struct msghdr m
= {
90 .msg_name
= (struct sockaddr
*) &a
,
91 .msg_namelen
= sizeof(a
),
92 .msg_control
= cmsg_data
,
93 .msg_controllen
= CMSG_LEN(sizeof(struct in6_pktinfo
)),
95 struct in6_pktinfo
*pkti
;
97 int fd
= iface
->fd
.fd
;
99 a
.sin6_family
= AF_INET6
;
100 a
.sin6_port
= htons(MCAST_PORT
);
102 m
.msg_iovlen
= iov_len
;
104 memset(cmsg_data
, 0, sizeof(cmsg_data
));
105 cmsg
= CMSG_FIRSTHDR(&m
);
106 cmsg
->cmsg_len
= m
.msg_controllen
;
107 cmsg
->cmsg_level
= IPPROTO_IPV6
;
108 cmsg
->cmsg_type
= IPV6_PKTINFO
;
110 pkti
= (struct in6_pktinfo
*) CMSG_DATA(cmsg
);
111 pkti
->ipi6_ifindex
= iface
->ifindex
;
113 if (iface
->multicast
) {
114 inet_pton(AF_INET6
, MCAST_ADDR6
, &a
.sin6_addr
);
116 fprintf(stderr
, "Ignoring IPv6 address for multicast interface\n");
118 a
.sin6_addr
= to
->sin6_addr
;
121 return sendmsg(fd
, &m
, 0);
125 interface_send_packet(struct interface
*iface
, struct sockaddr
*to
, struct iovec
*iov
, int iov_len
)
127 if (!iface
->multicast
&& !to
) {
128 fprintf(stderr
, "No IP address specified for unicast interface\n");
134 fprintf(stderr
, "TX ipv%d: %s\n", iface
->v6
* 2 + 4, iface
->name
);
135 fprintf(stderr
, " multicast: %d\n", iface
->multicast
);
139 return interface_send_packet6(iface
, (struct sockaddr_in6
*)to
, iov
, iov_len
);
141 return interface_send_packet4(iface
, (struct sockaddr_in
*)to
, iov
, iov_len
);
144 static void interface_close(struct interface
*iface
)
146 if (iface
->fd
.fd
< 0)
149 announce_free(iface
);
150 uloop_fd_delete(&iface
->fd
);
155 static void interface_free(struct interface
*iface
)
157 uloop_timeout_cancel(&iface
->reconnect
);
158 interface_close(iface
);
163 interface_valid_src(void *ip1
, void *mask
, void *ip2
, int len
)
173 for (i
= 0; i
< len
; i
++, i1
++, i2
++, m
++) {
174 if ((*i1
& *m
) != (*i2
& *m
))
182 read_socket4(struct uloop_fd
*u
, unsigned int events
)
184 struct interface
*iface
= container_of(u
, struct interface
, fd
);
185 static uint8_t buffer
[8 * 1024];
187 char cmsg
[CMSG_SPACE(sizeof(struct in_pktinfo
)) + CMSG_SPACE(sizeof(int)) + 1];
188 struct cmsghdr
*cmsgptr
;
191 struct sockaddr_in from
;
192 int flags
= 0, ifindex
= -1;
194 struct in_pktinfo
*inp
= NULL
;
197 interface_close(iface
);
198 uloop_timeout_set(&iface
->reconnect
, 1000);
202 iov
[0].iov_base
= buffer
;
203 iov
[0].iov_len
= sizeof(buffer
);
205 memset(&msg
, 0, sizeof(msg
));
206 msg
.msg_name
= (struct sockaddr
*) &from
;
207 msg
.msg_namelen
= sizeof(struct sockaddr_in
);
210 msg
.msg_control
= &cmsg
;
211 msg
.msg_controllen
= sizeof(cmsg
);
213 len
= recvmsg(u
->fd
, &msg
, flags
);
215 perror("read failed");
218 for (cmsgptr
= CMSG_FIRSTHDR(&msg
); cmsgptr
!= NULL
; cmsgptr
= CMSG_NXTHDR(&msg
, cmsgptr
)) {
219 void *c
= CMSG_DATA(cmsgptr
);
221 switch (cmsgptr
->cmsg_type
) {
223 inp
= ((struct in_pktinfo
*) c
);
227 ttl
= (uint8_t) *((int *) c
);
231 fprintf(stderr
, "unknown cmsg %x\n", cmsgptr
->cmsg_type
);
239 fprintf(stderr
, "RX ipv4: %s\n", iface
->name
);
240 fprintf(stderr
, " multicast: %d\n", iface
->multicast
);
241 inet_ntop(AF_INET
, &from
.sin_addr
, buf
, 256);
242 fprintf(stderr
, " src %s:%d\n", buf
, ntohs(from
.sin_port
));
243 inet_ntop(AF_INET
, &inp
->ipi_spec_dst
, buf
, 256);
244 fprintf(stderr
, " dst %s\n", buf
);
245 inet_ntop(AF_INET
, &inp
->ipi_addr
, buf
, 256);
246 fprintf(stderr
, " real %s\n", buf
);
249 if (inp
->ipi_ifindex
!= iface
->ifindex
)
250 fprintf(stderr
, "invalid iface index %d != %d\n", ifindex
, iface
->ifindex
);
251 else if (!interface_valid_src((void *) &iface
->v4_addr
, (void *) &iface
->v4_netmask
, (void *) &from
.sin_addr
, 4))
252 dns_handle_packet(iface
, (struct sockaddr
*) &from
, ntohs(from
.sin_port
), buffer
, len
);
256 read_socket6(struct uloop_fd
*u
, unsigned int events
)
258 struct interface
*iface
= container_of(u
, struct interface
, fd
);
259 static uint8_t buffer
[8 * 1024];
261 char cmsg6
[CMSG_SPACE(sizeof(struct in6_pktinfo
)) + CMSG_SPACE(sizeof(int)) + 1];
262 struct cmsghdr
*cmsgptr
;
265 struct sockaddr_in6 from
;
266 int flags
= 0, ifindex
= -1;
268 struct in6_pktinfo
*inp
= NULL
;
271 interface_close(iface
);
272 uloop_timeout_set(&iface
->reconnect
, 1000);
276 iov
[0].iov_base
= buffer
;
277 iov
[0].iov_len
= sizeof(buffer
);
279 memset(&msg
, 0, sizeof(msg
));
280 msg
.msg_name
= (struct sockaddr
*) &from
;
281 msg
.msg_namelen
= sizeof(struct sockaddr_in6
);
284 msg
.msg_control
= &cmsg6
;
285 msg
.msg_controllen
= sizeof(cmsg6
);
287 len
= recvmsg(u
->fd
, &msg
, flags
);
289 perror("read failed");
292 for (cmsgptr
= CMSG_FIRSTHDR(&msg
); cmsgptr
!= NULL
; cmsgptr
= CMSG_NXTHDR(&msg
, cmsgptr
)) {
293 void *c
= CMSG_DATA(cmsgptr
);
295 switch (cmsgptr
->cmsg_type
) {
297 inp
= ((struct in6_pktinfo
*) c
);
301 ttl
= (uint8_t) *((int *) c
);
305 fprintf(stderr
, "unknown cmsg %x\n", cmsgptr
->cmsg_type
);
313 fprintf(stderr
, "RX ipv6: %s\n", iface
->name
);
314 fprintf(stderr
, " multicast: %d\n", iface
->multicast
);
315 inet_ntop(AF_INET6
, &from
.sin6_addr
, buf
, 256);
316 fprintf(stderr
, " src %s:%d\n", buf
, ntohs(from
.sin6_port
));
317 inet_ntop(AF_INET6
, &inp
->ipi6_addr
, buf
, 256);
318 fprintf(stderr
, " dst %s\n", buf
);
321 if (inp
->ipi6_ifindex
!= iface
->ifindex
)
322 fprintf(stderr
, "invalid iface index %d != %d\n", ifindex
, iface
->ifindex
);
323 else if (!interface_valid_src((void *) &iface
->v6_addr
, (void *) &iface
->v6_netmask
, (void *) &from
.sin6_addr
, 16))
324 dns_handle_packet(iface
, (struct sockaddr
*) &from
, ntohs(from
.sin6_port
), buffer
, len
);
328 interface_mcast_setup4(struct interface
*iface
)
330 struct ip_mreqn mreq
;
333 struct sockaddr_in sa
= { 0 };
334 int fd
= iface
->fd
.fd
;
336 sa
.sin_family
= AF_INET
;
337 sa
.sin_port
= htons(MCAST_PORT
);
338 inet_pton(AF_INET
, MCAST_ADDR
, &sa
.sin_addr
);
340 memset(&mreq
, 0, sizeof(mreq
));
341 mreq
.imr_address
.s_addr
= iface
->v4_addr
.s_addr
;
342 mreq
.imr_multiaddr
= sa
.sin_addr
;
343 mreq
.imr_ifindex
= iface
->ifindex
;
345 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_TTL
, &ttl
, sizeof(ttl
)) < 0)
346 fprintf(stderr
, "ioctl failed: IP_MULTICAST_TTL\n");
348 /* Some network drivers have issues with dropping membership of
349 * mcast groups when the iface is down, but don't allow rejoining
350 * when it comes back up. This is an ugly workaround
351 * -- this was copied from avahi --
353 setsockopt(fd
, IPPROTO_IP
, IP_DROP_MEMBERSHIP
, &mreq
, sizeof(mreq
));
355 if (setsockopt(fd
, IPPROTO_IP
, IP_ADD_MEMBERSHIP
, &mreq
, sizeof(mreq
)) < 0) {
356 fprintf(stderr
, "failed to join multicast group: %s\n", strerror(errno
));
362 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_LOOP
, &no
, sizeof(no
)) < 0)
363 fprintf(stderr
, "ioctl failed: IP_MULTICAST_LOOP\n");
369 interface_socket_setup6(struct interface
*iface
)
371 struct ipv6_mreq mreq
;
374 struct sockaddr_in6 sa
= { 0 };
375 int fd
= iface
->fd
.fd
;
377 sa
.sin6_family
= AF_INET6
;
378 sa
.sin6_port
= htons(MCAST_PORT
);
379 inet_pton(AF_INET6
, MCAST_ADDR6
, &sa
.sin6_addr
);
381 memset(&mreq
, 0, sizeof(mreq
));
382 mreq
.ipv6mr_multiaddr
= sa
.sin6_addr
;
383 mreq
.ipv6mr_interface
= iface
->ifindex
;
385 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_MULTICAST_HOPS
, &ttl
, sizeof(ttl
)) < 0)
386 fprintf(stderr
, "ioctl failed: IPV6_MULTICAST_HOPS\n");
388 setsockopt(fd
, IPPROTO_IPV6
, IPV6_LEAVE_GROUP
, &mreq
, sizeof(mreq
));
389 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_ADD_MEMBERSHIP
, &mreq
, sizeof(mreq
)) < 0) {
390 fprintf(stderr
, "failed to join multicast group: %s\n", strerror(errno
));
396 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_MULTICAST_LOOP
, &no
, sizeof(no
)) < 0)
397 fprintf(stderr
, "ioctl failed: IPV6_MULTICAST_LOOP\n");
403 reconnect_socket4(struct uloop_timeout
*timeout
)
405 struct interface
*iface
= container_of(timeout
, struct interface
, reconnect
);
409 iface
->fd
.fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
| USOCK_IPV4ONLY
,
410 (iface
->multicast
) ? (iface
->mcast_addr
) : (iface
->v4_addrs
), "5353");
411 if (iface
->fd
.fd
< 0) {
412 fprintf(stderr
, "failed to add listener %s: %s\n", iface
->mcast_addr
, strerror(errno
));
416 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_BINDTODEVICE
, iface
->name
, strlen(iface
->name
) < 0))
417 fprintf(stderr
, "ioctl failed: SO_BINDTODEVICE\n");
419 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_REUSEADDR
, &yes
, sizeof(yes
)) < 0)
420 fprintf(stderr
, "ioctl failed: SO_REUSEADDR\n");
422 if (setsockopt(iface
->fd
.fd
, IPPROTO_IP
, IP_TTL
, &ttl
, sizeof(ttl
)) < 0)
423 fprintf(stderr
, "ioctl failed: IP_TTL\n");
425 if (setsockopt(iface
->fd
.fd
, IPPROTO_IP
, IP_RECVTTL
, &yes
, sizeof(yes
)) < 0)
426 fprintf(stderr
, "ioctl failed: IP_RECVTTL\n");
428 if (setsockopt(iface
->fd
.fd
, IPPROTO_IP
, IP_PKTINFO
, &yes
, sizeof(yes
)) < 0)
429 fprintf(stderr
, "ioctl failed: IP_PKTINFO\n");
431 if (iface
->multicast
&& interface_mcast_setup4(iface
)) {
436 uloop_fd_add(&iface
->fd
, ULOOP_READ
);
437 if (iface
->multicast
) {
438 dns_send_question(iface
, NULL
, C_DNS_SD
, TYPE_PTR
, 0);
439 announce_init(iface
);
445 uloop_timeout_set(timeout
, 1000);
449 reconnect_socket6(struct uloop_timeout
*timeout
)
451 struct interface
*iface
= container_of(timeout
, struct interface
, reconnect
);
452 char mcast_addr
[128];
456 snprintf(mcast_addr
, sizeof(mcast_addr
), "%s%%%s", (iface
->multicast
) ? (iface
->mcast_addr
) : (iface
->v6_addrs
), iface
->name
);
457 iface
->fd
.fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
| USOCK_IPV6ONLY
, mcast_addr
, "5353");
458 if (iface
->fd
.fd
< 0) {
459 fprintf(stderr
, "failed to add listener %s: %s\n", mcast_addr
, strerror(errno
));
463 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_BINDTODEVICE
, iface
->name
, strlen(iface
->name
) < 0))
464 fprintf(stderr
, "ioctl failed: SO_BINDTODEVICE\n");
466 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_UNICAST_HOPS
, &ttl
, sizeof(ttl
)) < 0)
467 fprintf(stderr
, "ioctl failed: IPV6_UNICAST_HOPS\n");
469 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &yes
, sizeof(yes
)) < 0)
470 fprintf(stderr
, "ioctl failed: IPV6_RECVPKTINFO\n");
472 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_RECVHOPLIMIT
, &yes
, sizeof(yes
)) < 0)
473 fprintf(stderr
, "ioctl failed: IPV6_RECVHOPLIMIT\n");
475 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_REUSEADDR
, &yes
, sizeof(yes
)) < 0)
476 fprintf(stderr
, "ioctl failed: SO_REUSEADDR\n");
478 if (iface
->multicast
&& interface_socket_setup6(iface
)) {
483 uloop_fd_add(&iface
->fd
, ULOOP_READ
);
485 if (iface
->multicast
) {
486 dns_send_question(iface
, NULL
, C_DNS_SD
, TYPE_PTR
, 0);
487 announce_init(iface
);
493 uloop_timeout_set(timeout
, 1000);
497 static void interface_start(struct interface
*iface
)
500 iface
->fd
.cb
= read_socket6
;
501 iface
->reconnect
.cb
= reconnect_socket6
;
503 iface
->fd
.cb
= read_socket4
;
504 iface
->reconnect
.cb
= reconnect_socket4
;
506 uloop_timeout_set(&iface
->reconnect
, 100);
510 iface_update_cb(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
511 struct vlist_node
*node_old
)
513 struct interface
*iface
;
516 iface
= container_of(node_old
, struct interface
, node
);
517 cache_cleanup(iface
);
518 interface_free(iface
);
522 iface
= container_of(node_new
, struct interface
, node
);
523 interface_start(iface
);
527 static struct interface
* _interface_add(const char *name
, int multicast
, int v6
)
529 struct interface
*iface
;
533 iface
= calloc_a(sizeof(*iface
),
534 &name_buf
, strlen(name
) + 1,
535 &id_buf
, strlen(name
) + 5);
537 sprintf(id_buf
, "%d_%d_%s", multicast
, v6
, name
);
538 iface
->name
= strcpy(name_buf
, name
);
540 iface
->ifindex
= if_nametoindex(name
);
542 iface
->multicast
= multicast
;
545 iface
->mcast_addr
= MCAST_ADDR6
;
547 iface
->mcast_addr
= MCAST_ADDR
;
549 if (iface
->ifindex
<= 0)
552 vlist_add(&interfaces
, &iface
->node
, iface
->id
);
560 int interface_add(const char *name
)
562 struct interface
*v4
= NULL
, *v6
= NULL
, *unicast
;
563 struct ifaddrs
*ifap
, *ifa
;
567 for (ifa
= ifap
; ifa
; ifa
= ifa
->ifa_next
) {
568 if (strcmp(ifa
->ifa_name
, name
))
570 if (ifa
->ifa_addr
->sa_family
== AF_INET
&& !v4
) {
571 struct sockaddr_in
*sa
;
573 if (cfg_proto
&& (cfg_proto
!= 4))
576 unicast
= _interface_add(name
, 0, 0);
579 v4
= _interface_add(name
, 1, 0);
583 sa
= (struct sockaddr_in
*) ifa
->ifa_addr
;
584 memcpy(&v4
->v4_addr
, &sa
->sin_addr
, sizeof(v4
->v4_addr
));
585 memcpy(&unicast
->v4_addr
, &sa
->sin_addr
, sizeof(unicast
->v4_addr
));
587 inet_ntop(AF_INET
, &sa
->sin_addr
, v4
->v4_addrs
, sizeof(v4
->v4_addrs
));
588 inet_ntop(AF_INET
, &sa
->sin_addr
, unicast
->v4_addrs
, sizeof(unicast
->v4_addrs
));
590 sa
= (struct sockaddr_in
*) ifa
->ifa_netmask
;
591 memcpy(&unicast
->v4_netmask
, &sa
->sin_addr
, sizeof(unicast
->v4_netmask
));
592 memcpy(&v4
->v4_netmask
, &sa
->sin_addr
, sizeof(v4
->v4_netmask
));
598 if (ifa
->ifa_addr
->sa_family
== AF_INET6
&& !v6
) {
599 uint8_t ll_prefix
[] = {0xfe, 0x80 };
600 struct sockaddr_in6
*sa6
;
602 if (cfg_proto
&& (cfg_proto
!= 6))
605 sa6
= (struct sockaddr_in6
*) ifa
->ifa_addr
;
606 if (memcmp(&sa6
->sin6_addr
, &ll_prefix
, 2))
609 unicast
= _interface_add(name
, 0, 1);
612 v6
= _interface_add(name
, 1, 1);
616 memcpy(&v6
->v6_addr
, &sa6
->sin6_addr
, sizeof(v6
->v6_addr
));
617 memcpy(&unicast
->v6_addr
, &sa6
->sin6_addr
, sizeof(unicast
->v6_addr
));
619 inet_ntop(AF_INET6
, &sa6
->sin6_addr
, v6
->v6_addrs
, sizeof(v6
->v6_addrs
));
620 inet_ntop(AF_INET6
, &sa6
->sin6_addr
, unicast
->v6_addrs
, sizeof(unicast
->v6_addrs
));
622 sa6
= (struct sockaddr_in6
*) ifa
->ifa_netmask
;
623 memcpy(&v6
->v6_netmask
, &sa6
->sin6_addr
, sizeof(v6
->v6_netmask
));
624 memcpy(&unicast
->v6_netmask
, &sa6
->sin6_addr
, sizeof(unicast
->v6_netmask
));
636 void interface_shutdown(void)
638 struct interface
*iface
;
640 vlist_for_each_element(&interfaces
, iface
, node
)
641 if (iface
->fd
.fd
> 0 && iface
->multicast
) {
642 dns_reply_a(iface
, NULL
, 0);
643 service_announce_services(iface
, NULL
, 0);
645 vlist_for_each_element(&interfaces
, iface
, node
)
646 interface_close(iface
);
650 interface_get(const char *name
, int v6
, int multicast
)
653 snprintf(id_buf
, sizeof(id_buf
), "%d_%d_%s", multicast
, v6
, name
);
654 struct interface
*iface
= vlist_find(&interfaces
, id_buf
, iface
, node
);
658 VLIST_TREE(interfaces
, avl_strcmp
, iface_update_cb
, false, false);