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
);
247 fprintf(stderr
, " ttl %u\n", ttl
);
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
, ntohs(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
);
314 fprintf(stderr
, "RX ipv6: %s\n", iface
->name
);
315 fprintf(stderr
, " multicast: %d\n", iface
->multicast
);
316 inet_ntop(AF_INET6
, &from
.sin6_addr
, buf
, 256);
317 fprintf(stderr
, " src %s:%d\n", buf
, ntohs(from
.sin6_port
));
318 inet_ntop(AF_INET6
, &inp
->ipi6_addr
, buf
, 256);
319 fprintf(stderr
, " dst %s\n", buf
);
320 fprintf(stderr
, " ttl %u\n", ttl
);
323 if (inp
->ipi6_ifindex
!= iface
->ifindex
)
324 fprintf(stderr
, "invalid iface index %d != %d\n", ifindex
, iface
->ifindex
);
325 else if (!interface_valid_src((void *) &iface
->v6_addr
, (void *) &iface
->v6_netmask
, (void *) &from
.sin6_addr
, 16))
326 dns_handle_packet(iface
, (struct sockaddr
*) &from
, ntohs(from
.sin6_port
), buffer
, len
);
330 interface_mcast_setup4(struct interface
*iface
)
332 struct ip_mreqn mreq
;
335 struct sockaddr_in sa
= { 0 };
336 int fd
= iface
->fd
.fd
;
338 sa
.sin_family
= AF_INET
;
339 sa
.sin_port
= htons(MCAST_PORT
);
340 inet_pton(AF_INET
, MCAST_ADDR
, &sa
.sin_addr
);
342 memset(&mreq
, 0, sizeof(mreq
));
343 mreq
.imr_address
.s_addr
= iface
->v4_addr
.s_addr
;
344 mreq
.imr_multiaddr
= sa
.sin_addr
;
345 mreq
.imr_ifindex
= iface
->ifindex
;
347 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_TTL
, &ttl
, sizeof(ttl
)) < 0)
348 fprintf(stderr
, "ioctl failed: IP_MULTICAST_TTL\n");
350 /* Some network drivers have issues with dropping membership of
351 * mcast groups when the iface is down, but don't allow rejoining
352 * when it comes back up. This is an ugly workaround
353 * -- this was copied from avahi --
355 setsockopt(fd
, IPPROTO_IP
, IP_DROP_MEMBERSHIP
, &mreq
, sizeof(mreq
));
357 if (setsockopt(fd
, IPPROTO_IP
, IP_ADD_MEMBERSHIP
, &mreq
, sizeof(mreq
)) < 0) {
358 fprintf(stderr
, "failed to join multicast group: %m\n");
364 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_LOOP
, &no
, sizeof(no
)) < 0)
365 fprintf(stderr
, "ioctl failed: IP_MULTICAST_LOOP\n");
371 interface_socket_setup6(struct interface
*iface
)
373 struct ipv6_mreq mreq
;
376 struct sockaddr_in6 sa
= { 0 };
377 int fd
= iface
->fd
.fd
;
379 sa
.sin6_family
= AF_INET6
;
380 sa
.sin6_port
= htons(MCAST_PORT
);
381 inet_pton(AF_INET6
, MCAST_ADDR6
, &sa
.sin6_addr
);
383 memset(&mreq
, 0, sizeof(mreq
));
384 mreq
.ipv6mr_multiaddr
= sa
.sin6_addr
;
385 mreq
.ipv6mr_interface
= iface
->ifindex
;
387 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_MULTICAST_HOPS
, &ttl
, sizeof(ttl
)) < 0)
388 fprintf(stderr
, "ioctl failed: IPV6_MULTICAST_HOPS\n");
390 setsockopt(fd
, IPPROTO_IPV6
, IPV6_LEAVE_GROUP
, &mreq
, sizeof(mreq
));
391 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_ADD_MEMBERSHIP
, &mreq
, sizeof(mreq
)) < 0) {
392 fprintf(stderr
, "failed to join multicast group: %m\n");
398 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_MULTICAST_LOOP
, &no
, sizeof(no
)) < 0)
399 fprintf(stderr
, "ioctl failed: IPV6_MULTICAST_LOOP\n");
405 reconnect_socket4(struct uloop_timeout
*timeout
)
407 struct interface
*iface
= container_of(timeout
, struct interface
, reconnect
);
411 iface
->fd
.fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
| USOCK_IPV4ONLY
,
412 (iface
->multicast
) ? (iface
->mcast_addr
) : (iface
->v4_addrs
), "5353");
413 if (iface
->fd
.fd
< 0) {
414 fprintf(stderr
, "failed to add listener %s: %m\n", iface
->mcast_addr
);
418 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_BINDTODEVICE
, iface
->name
, strlen(iface
->name
) < 0))
419 fprintf(stderr
, "ioctl failed: SO_BINDTODEVICE\n");
421 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_REUSEADDR
, &yes
, sizeof(yes
)) < 0)
422 fprintf(stderr
, "ioctl failed: SO_REUSEADDR\n");
424 if (setsockopt(iface
->fd
.fd
, IPPROTO_IP
, IP_TTL
, &ttl
, sizeof(ttl
)) < 0)
425 fprintf(stderr
, "ioctl failed: IP_TTL\n");
427 if (setsockopt(iface
->fd
.fd
, IPPROTO_IP
, IP_RECVTTL
, &yes
, sizeof(yes
)) < 0)
428 fprintf(stderr
, "ioctl failed: IP_RECVTTL\n");
430 if (setsockopt(iface
->fd
.fd
, IPPROTO_IP
, IP_PKTINFO
, &yes
, sizeof(yes
)) < 0)
431 fprintf(stderr
, "ioctl failed: IP_PKTINFO\n");
433 if (iface
->multicast
&& interface_mcast_setup4(iface
)) {
438 uloop_fd_add(&iface
->fd
, ULOOP_READ
);
439 if (iface
->multicast
) {
440 dns_send_question(iface
, NULL
, C_DNS_SD
, TYPE_PTR
, 0);
441 announce_init(iface
);
447 uloop_timeout_set(timeout
, 1000);
451 reconnect_socket6(struct uloop_timeout
*timeout
)
453 struct interface
*iface
= container_of(timeout
, struct interface
, reconnect
);
454 char mcast_addr
[128];
458 snprintf(mcast_addr
, sizeof(mcast_addr
), "%s%%%s", (iface
->multicast
) ? (iface
->mcast_addr
) : (iface
->v6_addrs
), iface
->name
);
459 iface
->fd
.fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
| USOCK_IPV6ONLY
, mcast_addr
, "5353");
460 if (iface
->fd
.fd
< 0) {
461 fprintf(stderr
, "failed to add listener %s: %m\n", mcast_addr
);
465 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_BINDTODEVICE
, iface
->name
, strlen(iface
->name
) < 0))
466 fprintf(stderr
, "ioctl failed: SO_BINDTODEVICE\n");
468 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_UNICAST_HOPS
, &ttl
, sizeof(ttl
)) < 0)
469 fprintf(stderr
, "ioctl failed: IPV6_UNICAST_HOPS\n");
471 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &yes
, sizeof(yes
)) < 0)
472 fprintf(stderr
, "ioctl failed: IPV6_RECVPKTINFO\n");
474 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_RECVHOPLIMIT
, &yes
, sizeof(yes
)) < 0)
475 fprintf(stderr
, "ioctl failed: IPV6_RECVHOPLIMIT\n");
477 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_REUSEADDR
, &yes
, sizeof(yes
)) < 0)
478 fprintf(stderr
, "ioctl failed: SO_REUSEADDR\n");
480 if (iface
->multicast
&& interface_socket_setup6(iface
)) {
485 uloop_fd_add(&iface
->fd
, ULOOP_READ
);
487 if (iface
->multicast
) {
488 dns_send_question(iface
, NULL
, C_DNS_SD
, TYPE_PTR
, 0);
489 announce_init(iface
);
495 uloop_timeout_set(timeout
, 1000);
499 static void interface_start(struct interface
*iface
)
502 iface
->fd
.cb
= read_socket6
;
503 iface
->reconnect
.cb
= reconnect_socket6
;
505 iface
->fd
.cb
= read_socket4
;
506 iface
->reconnect
.cb
= reconnect_socket4
;
508 uloop_timeout_set(&iface
->reconnect
, 100);
512 iface_update_cb(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
513 struct vlist_node
*node_old
)
515 struct interface
*iface
;
518 iface
= container_of(node_old
, struct interface
, node
);
519 cache_cleanup(iface
);
520 interface_free(iface
);
524 iface
= container_of(node_new
, struct interface
, node
);
525 interface_start(iface
);
529 static struct interface
* _interface_add(const char *name
, int multicast
, int v6
)
531 struct interface
*iface
;
535 iface
= calloc_a(sizeof(*iface
),
536 &name_buf
, strlen(name
) + 1,
537 &id_buf
, strlen(name
) + 5);
539 sprintf(id_buf
, "%d_%d_%s", multicast
, v6
, name
);
540 iface
->name
= strcpy(name_buf
, name
);
542 iface
->ifindex
= if_nametoindex(name
);
544 iface
->multicast
= multicast
;
547 iface
->mcast_addr
= MCAST_ADDR6
;
549 iface
->mcast_addr
= MCAST_ADDR
;
551 if (iface
->ifindex
<= 0)
554 vlist_add(&interfaces
, &iface
->node
, iface
->id
);
562 int interface_add(const char *name
)
564 struct interface
*v4
= NULL
, *v6
= NULL
, *unicast
;
565 struct ifaddrs
*ifap
, *ifa
;
569 for (ifa
= ifap
; ifa
; ifa
= ifa
->ifa_next
) {
570 if (strcmp(ifa
->ifa_name
, name
))
572 if (ifa
->ifa_addr
->sa_family
== AF_INET
&& !v4
) {
573 struct sockaddr_in
*sa
;
575 if (cfg_proto
&& (cfg_proto
!= 4))
578 unicast
= _interface_add(name
, 0, 0);
581 v4
= _interface_add(name
, 1, 0);
585 sa
= (struct sockaddr_in
*) ifa
->ifa_addr
;
586 memcpy(&v4
->v4_addr
, &sa
->sin_addr
, sizeof(v4
->v4_addr
));
587 memcpy(&unicast
->v4_addr
, &sa
->sin_addr
, sizeof(unicast
->v4_addr
));
589 inet_ntop(AF_INET
, &sa
->sin_addr
, v4
->v4_addrs
, sizeof(v4
->v4_addrs
));
590 inet_ntop(AF_INET
, &sa
->sin_addr
, unicast
->v4_addrs
, sizeof(unicast
->v4_addrs
));
592 sa
= (struct sockaddr_in
*) ifa
->ifa_netmask
;
593 memcpy(&unicast
->v4_netmask
, &sa
->sin_addr
, sizeof(unicast
->v4_netmask
));
594 memcpy(&v4
->v4_netmask
, &sa
->sin_addr
, sizeof(v4
->v4_netmask
));
600 if (ifa
->ifa_addr
->sa_family
== AF_INET6
&& !v6
) {
601 uint8_t ll_prefix
[] = {0xfe, 0x80 };
602 struct sockaddr_in6
*sa6
;
604 if (cfg_proto
&& (cfg_proto
!= 6))
607 sa6
= (struct sockaddr_in6
*) ifa
->ifa_addr
;
608 if (memcmp(&sa6
->sin6_addr
, &ll_prefix
, 2))
611 unicast
= _interface_add(name
, 0, 1);
614 v6
= _interface_add(name
, 1, 1);
618 memcpy(&v6
->v6_addr
, &sa6
->sin6_addr
, sizeof(v6
->v6_addr
));
619 memcpy(&unicast
->v6_addr
, &sa6
->sin6_addr
, sizeof(unicast
->v6_addr
));
621 inet_ntop(AF_INET6
, &sa6
->sin6_addr
, v6
->v6_addrs
, sizeof(v6
->v6_addrs
));
622 inet_ntop(AF_INET6
, &sa6
->sin6_addr
, unicast
->v6_addrs
, sizeof(unicast
->v6_addrs
));
624 sa6
= (struct sockaddr_in6
*) ifa
->ifa_netmask
;
625 memcpy(&v6
->v6_netmask
, &sa6
->sin6_addr
, sizeof(v6
->v6_netmask
));
626 memcpy(&unicast
->v6_netmask
, &sa6
->sin6_addr
, sizeof(unicast
->v6_netmask
));
638 void interface_shutdown(void)
640 struct interface
*iface
;
642 vlist_for_each_element(&interfaces
, iface
, node
)
643 if (iface
->fd
.fd
> 0 && iface
->multicast
) {
644 dns_reply_a(iface
, NULL
, 0);
645 service_announce_services(iface
, NULL
, 0);
647 vlist_for_each_element(&interfaces
, iface
, node
)
648 interface_close(iface
);
652 interface_get(const char *name
, int v6
, int multicast
)
655 snprintf(id_buf
, sizeof(id_buf
), "%d_%d_%s", multicast
, v6
, name
);
656 struct interface
*iface
= vlist_find(&interfaces
, id_buf
, iface
, node
);
660 VLIST_TREE(interfaces
, avl_strcmp
, iface_update_cb
, false, false);