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 uloop_timeout_cancel(&iface
->reconnect
);
157 interface_close(iface
);
162 interface_valid_src(void *ip1
, void *mask
, void *ip2
, int len
)
172 for (i
= 0; i
< len
; i
++, i1
++, i2
++, m
++) {
173 if ((*i1
& *m
) != (*i2
& *m
))
181 read_socket4(struct uloop_fd
*u
, unsigned int events
)
183 struct interface
*iface
= container_of(u
, struct interface
, fd
);
184 static uint8_t buffer
[8 * 1024];
186 char cmsg
[CMSG_SPACE(sizeof(struct in_pktinfo
)) + CMSG_SPACE(sizeof(int)) + 1];
187 struct cmsghdr
*cmsgptr
;
190 struct sockaddr_in from
;
191 int flags
= 0, ifindex
= -1;
193 struct in_pktinfo
*inp
= NULL
;
196 interface_close(iface
);
197 uloop_timeout_set(&iface
->reconnect
, 1000);
201 iov
[0].iov_base
= buffer
;
202 iov
[0].iov_len
= sizeof(buffer
);
204 memset(&msg
, 0, sizeof(msg
));
205 msg
.msg_name
= (struct sockaddr
*) &from
;
206 msg
.msg_namelen
= sizeof(struct sockaddr_in
);
209 msg
.msg_control
= &cmsg
;
210 msg
.msg_controllen
= sizeof(cmsg
);
212 len
= recvmsg(u
->fd
, &msg
, flags
);
214 perror("read failed");
217 for (cmsgptr
= CMSG_FIRSTHDR(&msg
); cmsgptr
!= NULL
; cmsgptr
= CMSG_NXTHDR(&msg
, cmsgptr
)) {
218 void *c
= CMSG_DATA(cmsgptr
);
220 switch (cmsgptr
->cmsg_type
) {
222 inp
= ((struct in_pktinfo
*) c
);
226 ttl
= (uint8_t) *((int *) c
);
230 fprintf(stderr
, "unknown cmsg %x\n", cmsgptr
->cmsg_type
);
241 fprintf(stderr
, "RX ipv4: %s\n", iface
->name
);
242 fprintf(stderr
, " multicast: %d\n", iface
->multicast
);
243 inet_ntop(AF_INET
, &from
.sin_addr
, buf
, 256);
244 fprintf(stderr
, " src %s:%d\n", buf
, from
.sin_port
);
245 inet_ntop(AF_INET
, &inp
->ipi_spec_dst
, buf
, 256);
246 fprintf(stderr
, " dst %s\n", buf
);
247 inet_ntop(AF_INET
, &inp
->ipi_addr
, buf
, 256);
248 fprintf(stderr
, " real %s\n", buf
);
251 if (inp
->ipi_ifindex
!= iface
->ifindex
)
252 fprintf(stderr
, "invalid iface index %d != %d\n", ifindex
, iface
->ifindex
);
253 else if (!interface_valid_src((void *) &iface
->v4_addr
, (void *) &iface
->v4_netmask
, (void *) &from
.sin_addr
, 4))
254 dns_handle_packet(iface
, (struct sockaddr
*) &from
, from
.sin_port
, buffer
, len
);
258 read_socket6(struct uloop_fd
*u
, unsigned int events
)
260 struct interface
*iface
= container_of(u
, struct interface
, fd
);
261 static uint8_t buffer
[8 * 1024];
263 char cmsg6
[CMSG_SPACE(sizeof(struct in6_pktinfo
)) + CMSG_SPACE(sizeof(int)) + 1];
264 struct cmsghdr
*cmsgptr
;
267 struct sockaddr_in6 from
;
268 int flags
= 0, ifindex
= -1;
270 struct in6_pktinfo
*inp
= NULL
;
273 interface_close(iface
);
274 uloop_timeout_set(&iface
->reconnect
, 1000);
278 iov
[0].iov_base
= buffer
;
279 iov
[0].iov_len
= sizeof(buffer
);
281 memset(&msg
, 0, sizeof(msg
));
282 msg
.msg_name
= (struct sockaddr
*) &from
;
283 msg
.msg_namelen
= sizeof(struct sockaddr_in6
);
286 msg
.msg_control
= &cmsg6
;
287 msg
.msg_controllen
= sizeof(cmsg6
);
289 len
= recvmsg(u
->fd
, &msg
, flags
);
291 perror("read failed");
294 for (cmsgptr
= CMSG_FIRSTHDR(&msg
); cmsgptr
!= NULL
; cmsgptr
= CMSG_NXTHDR(&msg
, cmsgptr
)) {
295 void *c
= CMSG_DATA(cmsgptr
);
297 switch (cmsgptr
->cmsg_type
) {
299 inp
= ((struct in6_pktinfo
*) c
);
303 ttl
= (uint8_t) *((int *) c
);
307 fprintf(stderr
, "unknown cmsg %x\n", cmsgptr
->cmsg_type
);
318 fprintf(stderr
, "RX ipv6: %s\n", iface
->name
);
319 fprintf(stderr
, " multicast: %d\n", iface
->multicast
);
320 inet_ntop(AF_INET6
, &from
.sin6_addr
, buf
, 256);
321 fprintf(stderr
, " src %s:%d\n", buf
, from
.sin6_port
);
322 inet_ntop(AF_INET6
, &inp
->ipi6_addr
, buf
, 256);
323 fprintf(stderr
, " dst %s\n", buf
);
326 if (inp
->ipi6_ifindex
!= iface
->ifindex
)
327 fprintf(stderr
, "invalid iface index %d != %d\n", ifindex
, iface
->ifindex
);
328 else if (!interface_valid_src((void *) &iface
->v6_addr
, (void *) &iface
->v6_netmask
, (void *) &from
.sin6_addr
, 16))
329 dns_handle_packet(iface
, (struct sockaddr
*) &from
, from
.sin6_port
, buffer
, len
);
333 interface_mcast_setup4(struct interface
*iface
)
335 struct ip_mreqn mreq
;
338 struct sockaddr_in sa
= { 0 };
339 int fd
= iface
->fd
.fd
;
341 sa
.sin_family
= AF_INET
;
342 sa
.sin_port
= htons(MCAST_PORT
);
343 inet_pton(AF_INET
, MCAST_ADDR
, &sa
.sin_addr
);
345 memset(&mreq
, 0, sizeof(mreq
));
346 mreq
.imr_address
.s_addr
= iface
->v4_addr
.s_addr
;
347 mreq
.imr_multiaddr
= sa
.sin_addr
;
348 mreq
.imr_ifindex
= iface
->ifindex
;
350 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_TTL
, &ttl
, sizeof(ttl
)) < 0)
351 fprintf(stderr
, "ioctl failed: IP_MULTICAST_TTL\n");
353 /* Some network drivers have issues with dropping membership of
354 * mcast groups when the iface is down, but don't allow rejoining
355 * when it comes back up. This is an ugly workaround
356 * -- this was copied from avahi --
358 setsockopt(fd
, IPPROTO_IP
, IP_DROP_MEMBERSHIP
, &mreq
, sizeof(mreq
));
360 if (setsockopt(fd
, IPPROTO_IP
, IP_ADD_MEMBERSHIP
, &mreq
, sizeof(mreq
)) < 0) {
361 fprintf(stderr
, "failed to join multicast group: %s\n", strerror(errno
));
367 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_LOOP
, &no
, sizeof(no
)) < 0)
368 fprintf(stderr
, "ioctl failed: IP_MULTICAST_LOOP\n");
374 interface_socket_setup6(struct interface
*iface
)
376 struct ipv6_mreq mreq
;
379 struct sockaddr_in6 sa
= { 0 };
380 int fd
= iface
->fd
.fd
;
382 sa
.sin6_family
= AF_INET6
;
383 sa
.sin6_port
= htons(MCAST_PORT
);
384 inet_pton(AF_INET6
, MCAST_ADDR6
, &sa
.sin6_addr
);
386 memset(&mreq
, 0, sizeof(mreq
));
387 mreq
.ipv6mr_multiaddr
= sa
.sin6_addr
;
388 mreq
.ipv6mr_interface
= iface
->ifindex
;
390 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_MULTICAST_HOPS
, &ttl
, sizeof(ttl
)) < 0)
391 fprintf(stderr
, "ioctl failed: IPV6_MULTICAST_HOPS\n");
393 setsockopt(fd
, IPPROTO_IPV6
, IPV6_LEAVE_GROUP
, &mreq
, sizeof(mreq
));
394 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_ADD_MEMBERSHIP
, &mreq
, sizeof(mreq
)) < 0) {
395 fprintf(stderr
, "failed to join multicast group: %s\n", strerror(errno
));
401 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_MULTICAST_LOOP
, &no
, sizeof(no
)) < 0)
402 fprintf(stderr
, "ioctl failed: IPV6_MULTICAST_LOOP\n");
408 reconnect_socket4(struct uloop_timeout
*timeout
)
410 struct interface
*iface
= container_of(timeout
, struct interface
, reconnect
);
414 iface
->fd
.fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
| USOCK_IPV4ONLY
,
415 (iface
->multicast
) ? (iface
->mcast_addr
) : (iface
->v4_addrs
), "5353");
416 if (iface
->fd
.fd
< 0) {
417 fprintf(stderr
, "failed to add listener %s: %s\n", iface
->mcast_addr
, strerror(errno
));
421 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_BINDTODEVICE
, iface
->name
, strlen(iface
->name
) < 0))
422 fprintf(stderr
, "ioctl failed: SO_BINDTODEVICE\n");
424 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_REUSEADDR
, &yes
, sizeof(yes
)) < 0)
425 fprintf(stderr
, "ioctl failed: SO_REUSEADDR\n");
427 if (setsockopt(iface
->fd
.fd
, IPPROTO_IP
, IP_TTL
, &ttl
, sizeof(ttl
)) < 0)
428 fprintf(stderr
, "ioctl failed: IP_TTL\n");
430 if (setsockopt(iface
->fd
.fd
, IPPROTO_IP
, IP_RECVTTL
, &yes
, sizeof(yes
)) < 0)
431 fprintf(stderr
, "ioctl failed: IP_RECVTTL\n");
433 if (setsockopt(iface
->fd
.fd
, IPPROTO_IP
, IP_PKTINFO
, &yes
, sizeof(yes
)) < 0)
434 fprintf(stderr
, "ioctl failed: IP_PKTINFO\n");
436 if (iface
->multicast
&& interface_mcast_setup4(iface
)) {
441 uloop_fd_add(&iface
->fd
, ULOOP_READ
);
442 if (iface
->multicast
) {
443 dns_send_question(iface
, "_services._dns-sd._udp.local", TYPE_PTR
, 0);
444 announce_init(iface
);
450 uloop_timeout_set(timeout
, 1000);
454 reconnect_socket6(struct uloop_timeout
*timeout
)
456 struct interface
*iface
= container_of(timeout
, struct interface
, reconnect
);
457 char mcast_addr
[128];
461 snprintf(mcast_addr
, sizeof(mcast_addr
), "%s%%%s", (iface
->multicast
) ? (iface
->mcast_addr
) : (iface
->v6_addrs
), iface
->name
);
462 iface
->fd
.fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
| USOCK_IPV6ONLY
, mcast_addr
, "5353");
463 if (iface
->fd
.fd
< 0) {
464 fprintf(stderr
, "failed to add listener %s: %s\n", mcast_addr
, strerror(errno
));
468 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_BINDTODEVICE
, iface
->name
, strlen(iface
->name
) < 0))
469 fprintf(stderr
, "ioctl failed: SO_BINDTODEVICE\n");
471 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_UNICAST_HOPS
, &ttl
, sizeof(ttl
)) < 0)
472 fprintf(stderr
, "ioctl failed: IPV6_UNICAST_HOPS\n");
474 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &yes
, sizeof(yes
)) < 0)
475 fprintf(stderr
, "ioctl failed: IPV6_RECVPKTINFO\n");
477 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_RECVHOPLIMIT
, &yes
, sizeof(yes
)) < 0)
478 fprintf(stderr
, "ioctl failed: IPV6_RECVHOPLIMIT\n");
480 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_REUSEADDR
, &yes
, sizeof(yes
)) < 0)
481 fprintf(stderr
, "ioctl failed: SO_REUSEADDR\n");
483 if (iface
->multicast
&& interface_socket_setup6(iface
)) {
488 uloop_fd_add(&iface
->fd
, ULOOP_READ
);
490 if (iface
->multicast
) {
491 dns_send_question(iface
, "_services._dns-sd._udp.local", TYPE_PTR
, 0);
492 announce_init(iface
);
498 uloop_timeout_set(timeout
, 1000);
502 static void interface_start(struct interface
*iface
)
505 iface
->fd
.cb
= read_socket6
;
506 iface
->reconnect
.cb
= reconnect_socket6
;
508 iface
->fd
.cb
= read_socket4
;
509 iface
->reconnect
.cb
= reconnect_socket4
;
511 uloop_timeout_set(&iface
->reconnect
, 100);
515 iface_update_cb(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
516 struct vlist_node
*node_old
)
518 struct interface
*iface
;
521 iface
= container_of(node_old
, struct interface
, node
);
522 interface_free(iface
);
526 iface
= container_of(node_new
, struct interface
, node
);
527 interface_start(iface
);
531 static struct interface
* _interface_add(const char *name
, int multicast
, int v6
)
533 struct interface
*iface
;
537 iface
= calloc_a(sizeof(*iface
),
538 &name_buf
, strlen(name
) + 1,
539 &id_buf
, strlen(name
) + 5);
541 sprintf(id_buf
, "%d_%d_%s", multicast
, v6
, name
);
542 iface
->name
= strcpy(name_buf
, name
);
544 iface
->ifindex
= if_nametoindex(name
);
546 iface
->multicast
= multicast
;
549 iface
->mcast_addr
= MCAST_ADDR6
;
551 iface
->mcast_addr
= MCAST_ADDR
;
553 if (iface
->ifindex
<= 0)
556 vlist_add(&interfaces
, &iface
->node
, iface
->id
);
564 int interface_add(const char *name
)
566 struct interface
*v4
= NULL
, *v6
= NULL
, *unicast
;
567 struct ifaddrs
*ifap
, *ifa
;
571 for (ifa
= ifap
; ifa
; ifa
= ifa
->ifa_next
) {
572 if (strcmp(ifa
->ifa_name
, name
))
574 if (ifa
->ifa_addr
->sa_family
== AF_INET
&& !v4
) {
575 struct sockaddr_in
*sa
;
577 if (cfg_proto
&& (cfg_proto
!= 4))
580 unicast
= _interface_add(name
, 0, 0);
583 v4
= _interface_add(name
, 1, 0);
587 sa
= (struct sockaddr_in
*) ifa
->ifa_addr
;
588 memcpy(&v4
->v4_addr
, &sa
->sin_addr
, sizeof(v4
->v4_addr
));
589 memcpy(&unicast
->v4_addr
, &sa
->sin_addr
, sizeof(unicast
->v4_addr
));
591 inet_ntop(AF_INET
, &sa
->sin_addr
, v4
->v4_addrs
, sizeof(v4
->v4_addrs
));
592 inet_ntop(AF_INET
, &sa
->sin_addr
, unicast
->v4_addrs
, sizeof(unicast
->v4_addrs
));
594 sa
= (struct sockaddr_in
*) ifa
->ifa_netmask
;
595 memcpy(&unicast
->v4_netmask
, &sa
->sin_addr
, sizeof(unicast
->v4_netmask
));
596 memcpy(&v4
->v4_netmask
, &sa
->sin_addr
, sizeof(v4
->v4_netmask
));
602 if (ifa
->ifa_addr
->sa_family
== AF_INET6
&& !v6
) {
603 uint8_t ll_prefix
[] = {0xfe, 0x80 };
604 struct sockaddr_in6
*sa6
;
606 if (cfg_proto
&& (cfg_proto
!= 6))
609 sa6
= (struct sockaddr_in6
*) ifa
->ifa_addr
;
610 if (memcmp(&sa6
->sin6_addr
, &ll_prefix
, 2))
613 unicast
= _interface_add(name
, 0, 1);
616 v6
= _interface_add(name
, 1, 1);
620 memcpy(&v6
->v6_addr
, &sa6
->sin6_addr
, sizeof(v6
->v6_addr
));
621 memcpy(&unicast
->v6_addr
, &sa6
->sin6_addr
, sizeof(unicast
->v6_addr
));
623 inet_ntop(AF_INET6
, &sa6
->sin6_addr
, v6
->v6_addrs
, sizeof(v6
->v6_addrs
));
624 inet_ntop(AF_INET6
, &sa6
->sin6_addr
, unicast
->v6_addrs
, sizeof(unicast
->v6_addrs
));
626 sa6
= (struct sockaddr_in6
*) ifa
->ifa_netmask
;
627 memcpy(&v6
->v6_netmask
, &sa6
->sin6_addr
, sizeof(v6
->v6_netmask
));
628 memcpy(&unicast
->v6_netmask
, &sa6
->sin6_addr
, sizeof(unicast
->v6_netmask
));
640 void interface_shutdown(void)
642 struct interface
*iface
;
644 vlist_for_each_element(&interfaces
, iface
, node
)
645 if (iface
->fd
.fd
> 0 && iface
->multicast
) {
646 dns_reply_a(iface
, NULL
, 0);
647 service_announce_services(iface
, NULL
, 0);
649 vlist_for_each_element(&interfaces
, iface
, node
)
650 interface_close(iface
);
654 interface_get(const char *name
, int v6
, int multicast
)
657 snprintf(id_buf
, sizeof(id_buf
), "%d_%d_%s", multicast
, v6
, name
);
658 struct interface
*iface
= vlist_find(&interfaces
, id_buf
, iface
, node
);
662 VLIST_TREE(interfaces
, avl_strcmp
, iface_update_cb
, false, false);