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"
43 interface_send_packet4(struct interface
*iface
, struct iovec
*iov
, int iov_len
)
45 static size_t cmsg_data
[( CMSG_SPACE(sizeof(struct in_pktinfo
)) / sizeof(size_t)) + 1];
46 static struct sockaddr_in a
;
47 static struct msghdr m
= {
48 .msg_name
= (struct sockaddr
*) &a
,
49 .msg_namelen
= sizeof(a
),
50 .msg_control
= cmsg_data
,
51 .msg_controllen
= CMSG_LEN(sizeof(struct in_pktinfo
)),
53 struct in_pktinfo
*pkti
;
55 int fd
= iface
->fd
.fd
;
57 a
.sin_family
= AF_INET
;
58 a
.sin_port
= htons(MCAST_PORT
);
60 m
.msg_iovlen
= iov_len
;
62 memset(cmsg_data
, 0, sizeof(cmsg_data
));
63 cmsg
= CMSG_FIRSTHDR(&m
);
64 cmsg
->cmsg_len
= m
.msg_controllen
;
65 cmsg
->cmsg_level
= IPPROTO_IP
;
66 cmsg
->cmsg_type
= IP_PKTINFO
;
68 pkti
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
69 pkti
->ipi_ifindex
= iface
->ifindex
;
71 a
.sin_addr
.s_addr
= inet_addr(MCAST_ADDR
);
73 return sendmsg(fd
, &m
, 0);
77 interface_send_packet6(struct interface
*iface
, struct iovec
*iov
, int iov_len
)
79 static size_t cmsg_data
[( CMSG_SPACE(sizeof(struct in6_pktinfo
)) / sizeof(size_t)) + 1];
80 static struct sockaddr_in6 a
;
81 static struct msghdr m
= {
82 .msg_name
= (struct sockaddr
*) &a
,
83 .msg_namelen
= sizeof(a
),
84 .msg_control
= cmsg_data
,
85 .msg_controllen
= CMSG_LEN(sizeof(struct in6_pktinfo
)),
87 struct in6_pktinfo
*pkti
;
89 int fd
= iface
->fd
.fd
;
91 a
.sin6_family
= AF_INET6
;
92 a
.sin6_port
= htons(MCAST_PORT
);
94 m
.msg_iovlen
= iov_len
;
96 memset(cmsg_data
, 0, sizeof(cmsg_data
));
97 cmsg
= CMSG_FIRSTHDR(&m
);
98 cmsg
->cmsg_len
= m
.msg_controllen
;
99 cmsg
->cmsg_level
= IPPROTO_IPV6
;
100 cmsg
->cmsg_type
= IPV6_PKTINFO
;
102 pkti
= (struct in6_pktinfo
*) CMSG_DATA(cmsg
);
103 pkti
->ipi6_ifindex
= iface
->ifindex
;
105 inet_pton(AF_INET6
, MCAST_ADDR6
, &a
.sin6_addr
);
107 return sendmsg(fd
, &m
, 0);
111 interface_send_packet(struct interface
*iface
, struct iovec
*iov
, int iov_len
)
114 fprintf(stderr
, "TX ipv%d: %s\n", iface
->v6
* 2 + 4, iface
->name
);
115 fprintf(stderr
, " multicast: %d\n", iface
->multicast
);
119 return interface_send_packet6(iface
, iov
, iov_len
);
121 return interface_send_packet4(iface
, iov
, iov_len
);
124 static void interface_close(struct interface
*iface
)
126 if (iface
->fd
.fd
< 0)
129 announce_free(iface
);
130 uloop_fd_delete(&iface
->fd
);
135 static void interface_free(struct interface
*iface
)
137 interface_close(iface
);
142 read_socket4(struct uloop_fd
*u
, unsigned int events
)
144 struct interface
*iface
= container_of(u
, struct interface
, fd
);
145 static uint8_t buffer
[8 * 1024];
147 char cmsg
[CMSG_SPACE(sizeof(struct in_pktinfo
)) + CMSG_SPACE(sizeof(int)) + 1];
148 struct cmsghdr
*cmsgptr
;
151 struct sockaddr_in from
;
152 int flags
= 0, ifindex
= -1;
154 struct in_pktinfo
*inp
= NULL
;
157 interface_close(iface
);
158 uloop_timeout_set(&iface
->reconnect
, 1000);
162 iov
[0].iov_base
= buffer
;
163 iov
[0].iov_len
= sizeof(buffer
);
165 memset(&msg
, 0, sizeof(msg
));
166 msg
.msg_name
= (struct sockaddr
*) &from
;
167 msg
.msg_namelen
= sizeof(struct sockaddr_in
);
170 msg
.msg_control
= &cmsg
;
171 msg
.msg_controllen
= sizeof(cmsg
);
173 len
= recvmsg(u
->fd
, &msg
, flags
);
175 perror("read failed");
178 for (cmsgptr
= CMSG_FIRSTHDR(&msg
); cmsgptr
!= NULL
; cmsgptr
= CMSG_NXTHDR(&msg
, cmsgptr
)) {
179 void *c
= CMSG_DATA(cmsgptr
);
181 switch (cmsgptr
->cmsg_type
) {
183 inp
= ((struct in_pktinfo
*) c
);
187 ttl
= (uint8_t) *((int *) c
);
191 fprintf(stderr
, "unknown cmsg %x\n", cmsgptr
->cmsg_type
);
202 fprintf(stderr
, "RX ipv4: %s\n", iface
->name
);
203 fprintf(stderr
, " multicast: %d\n", iface
->multicast
);
204 inet_ntop(AF_INET
, &from
.sin_addr
, buf
, 256);
205 fprintf(stderr
, " src %s:%d\n", buf
, from
.sin_port
);
206 inet_ntop(AF_INET
, &inp
->ipi_spec_dst
, buf
, 256);
207 fprintf(stderr
, " dst %s\n", buf
);
208 inet_ntop(AF_INET
, &inp
->ipi_addr
, buf
, 256);
209 fprintf(stderr
, " real %s\n", buf
);
212 if (inp
->ipi_ifindex
!= iface
->ifindex
)
213 fprintf(stderr
, "invalid iface index %d != %d\n", ifindex
, iface
->ifindex
);
215 dns_handle_packet(iface
, buffer
, len
, 0);
219 read_socket6(struct uloop_fd
*u
, unsigned int events
)
221 struct interface
*iface
= container_of(u
, struct interface
, fd
);
222 static uint8_t buffer
[8 * 1024];
224 char cmsg6
[CMSG_SPACE(sizeof(struct in6_pktinfo
)) + CMSG_SPACE(sizeof(int)) + 1];
225 struct cmsghdr
*cmsgptr
;
228 struct sockaddr_in6 from
;
229 int flags
= 0, ifindex
= -1;
231 struct in6_pktinfo
*inp
= NULL
;
234 interface_close(iface
);
235 uloop_timeout_set(&iface
->reconnect
, 1000);
239 iov
[0].iov_base
= buffer
;
240 iov
[0].iov_len
= sizeof(buffer
);
242 memset(&msg
, 0, sizeof(msg
));
243 msg
.msg_name
= (struct sockaddr
*) &from
;
244 msg
.msg_namelen
= sizeof(struct sockaddr_in6
);
247 msg
.msg_control
= &cmsg6
;
248 msg
.msg_controllen
= sizeof(cmsg6
);
250 len
= recvmsg(u
->fd
, &msg
, flags
);
252 perror("read failed");
255 for (cmsgptr
= CMSG_FIRSTHDR(&msg
); cmsgptr
!= NULL
; cmsgptr
= CMSG_NXTHDR(&msg
, cmsgptr
)) {
256 void *c
= CMSG_DATA(cmsgptr
);
258 switch (cmsgptr
->cmsg_type
) {
260 inp
= ((struct in6_pktinfo
*) c
);
264 ttl
= (uint8_t) *((int *) c
);
268 fprintf(stderr
, "unknown cmsg %x\n", cmsgptr
->cmsg_type
);
279 fprintf(stderr
, "RX ipv6: %s\n", iface
->name
);
280 fprintf(stderr
, " multicast: %d\n", iface
->multicast
);
281 inet_ntop(AF_INET6
, &from
.sin6_addr
, buf
, 256);
282 fprintf(stderr
, " src %s:%d\n", buf
, from
.sin6_port
);
283 inet_ntop(AF_INET6
, &inp
->ipi6_addr
, buf
, 256);
284 fprintf(stderr
, " dst %s\n", buf
);
287 if (inp
->ipi6_ifindex
!= iface
->ifindex
)
288 fprintf(stderr
, "invalid iface index %d != %d\n", ifindex
, iface
->ifindex
);
290 dns_handle_packet(iface
, buffer
, len
, 0);
294 interface_mcast_setup4(struct interface
*iface
)
296 struct ip_mreqn mreq
;
299 struct sockaddr_in sa
= { 0 };
300 int fd
= iface
->fd
.fd
;
302 sa
.sin_family
= AF_INET
;
303 sa
.sin_port
= htons(MCAST_PORT
);
304 inet_pton(AF_INET
, MCAST_ADDR
, &sa
.sin_addr
);
306 memset(&mreq
, 0, sizeof(mreq
));
307 mreq
.imr_address
.s_addr
= iface
->v4_addr
.s_addr
;
308 mreq
.imr_multiaddr
= sa
.sin_addr
;
309 mreq
.imr_ifindex
= iface
->ifindex
;
311 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_TTL
, &ttl
, sizeof(ttl
)) < 0)
312 fprintf(stderr
, "ioctl failed: IP_MULTICAST_TTL\n");
314 /* Some network drivers have issues with dropping membership of
315 * mcast groups when the iface is down, but don't allow rejoining
316 * when it comes back up. This is an ugly workaround
317 * -- this was copied from avahi --
319 setsockopt(fd
, IPPROTO_IP
, IP_DROP_MEMBERSHIP
, &mreq
, sizeof(mreq
));
321 if (setsockopt(fd
, IPPROTO_IP
, IP_ADD_MEMBERSHIP
, &mreq
, sizeof(mreq
)) < 0) {
322 fprintf(stderr
, "failed to join multicast group: %s\n", strerror(errno
));
328 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_LOOP
, &no
, sizeof(no
)) < 0)
329 fprintf(stderr
, "ioctl failed: IP_MULTICAST_LOOP\n");
335 interface_socket_setup6(struct interface
*iface
)
337 struct ipv6_mreq mreq
;
340 struct sockaddr_in6 sa
= { 0 };
341 int fd
= iface
->fd
.fd
;
343 sa
.sin6_family
= AF_INET6
;
344 sa
.sin6_port
= htons(MCAST_PORT
);
345 inet_pton(AF_INET6
, MCAST_ADDR6
, &sa
.sin6_addr
);
347 memset(&mreq
, 0, sizeof(mreq
));
348 mreq
.ipv6mr_multiaddr
= sa
.sin6_addr
;
349 mreq
.ipv6mr_interface
= iface
->ifindex
;
351 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_MULTICAST_HOPS
, &ttl
, sizeof(ttl
)) < 0)
352 fprintf(stderr
, "ioctl failed: IPV6_MULTICAST_HOPS\n");
354 setsockopt(fd
, IPPROTO_IPV6
, IPV6_LEAVE_GROUP
, &mreq
, sizeof(mreq
));
355 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_ADD_MEMBERSHIP
, &mreq
, sizeof(mreq
)) < 0) {
356 fprintf(stderr
, "failed to join multicast group: %s\n", strerror(errno
));
362 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_MULTICAST_LOOP
, &no
, sizeof(no
)) < 0)
363 fprintf(stderr
, "ioctl failed: IPV6_MULTICAST_LOOP\n");
369 reconnect_socket4(struct uloop_timeout
*timeout
)
371 struct interface
*iface
= container_of(timeout
, struct interface
, reconnect
);
374 iface
->fd
.fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
| USOCK_IPV4ONLY
,
375 (iface
->multicast
) ? (iface
->mcast_addr
) : (iface
->v4_addrs
), "5353");
376 if (iface
->fd
.fd
< 0) {
377 fprintf(stderr
, "failed to add listener %s: %s\n", iface
->mcast_addr
, strerror(errno
));
381 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_BINDTODEVICE
, iface
->name
, strlen(iface
->name
) < 0))
382 fprintf(stderr
, "ioctl failed: SO_BINDTODEVICE\n");
384 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_REUSEADDR
, &yes
, sizeof(yes
)) < 0)
385 fprintf(stderr
, "ioctl failed: SO_REUSEADDR\n");
387 if (setsockopt(iface
->fd
.fd
, IPPROTO_IP
, IP_RECVTTL
, &yes
, sizeof(yes
)) < 0)
388 fprintf(stderr
, "ioctl failed: IP_RECVTTL\n");
390 if (setsockopt(iface
->fd
.fd
, IPPROTO_IP
, IP_PKTINFO
, &yes
, sizeof(yes
)) < 0)
391 fprintf(stderr
, "ioctl failed: IP_PKTINFO\n");
393 if (iface
->multicast
&& interface_mcast_setup4(iface
)) {
398 uloop_fd_add(&iface
->fd
, ULOOP_READ
);
399 if (iface
->multicast
) {
400 dns_send_question(iface
, "_services._dns-sd._udp.local", TYPE_PTR
, 1);
401 announce_init(iface
);
407 uloop_timeout_set(timeout
, 1000);
411 reconnect_socket6(struct uloop_timeout
*timeout
)
413 struct interface
*iface
= container_of(timeout
, struct interface
, reconnect
);
414 char mcast_addr
[128];
418 snprintf(mcast_addr
, sizeof(mcast_addr
), "%s%%%s", (iface
->multicast
) ? (iface
->mcast_addr
) : (iface
->v6_addrs
), iface
->name
);
419 iface
->fd
.fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
| USOCK_IPV6ONLY
, mcast_addr
, "5353");
420 if (iface
->fd
.fd
< 0) {
421 fprintf(stderr
, "failed to add listener %s: %s\n", mcast_addr
, strerror(errno
));
425 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_BINDTODEVICE
, iface
->name
, strlen(iface
->name
) < 0))
426 fprintf(stderr
, "ioctl failed: SO_BINDTODEVICE\n");
428 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_UNICAST_HOPS
, &ttl
, sizeof(ttl
)) < 0)
429 fprintf(stderr
, "ioctl failed: IPV6_UNICAST_HOPS\n");
431 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &yes
, sizeof(yes
)) < 0)
432 fprintf(stderr
, "ioctl failed: IPV6_RECVPKTINFO\n");
434 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_RECVHOPLIMIT
, &yes
, sizeof(yes
)) < 0)
435 fprintf(stderr
, "ioctl failed: IPV6_RECVHOPLIMIT\n");
437 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_REUSEADDR
, &yes
, sizeof(yes
)) < 0)
438 fprintf(stderr
, "ioctl failed: SO_REUSEADDR\n");
440 if (iface
->multicast
&& interface_socket_setup6(iface
)) {
445 uloop_fd_add(&iface
->fd
, ULOOP_READ
);
447 if (iface
->multicast
) {
448 dns_send_question(iface
, "_services._dns-sd._udp.local", TYPE_PTR
, 1);
449 announce_init(iface
);
455 uloop_timeout_set(timeout
, 1000);
459 static void interface_start(struct interface
*iface
)
462 iface
->fd
.cb
= read_socket6
;
463 iface
->reconnect
.cb
= reconnect_socket6
;
465 iface
->fd
.cb
= read_socket4
;
466 iface
->reconnect
.cb
= reconnect_socket4
;
468 uloop_timeout_set(&iface
->reconnect
, 100);
472 iface_update_cb(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
473 struct vlist_node
*node_old
)
475 struct interface
*iface
;
478 iface
= container_of(node_old
, struct interface
, node
);
479 interface_free(iface
);
483 iface
= container_of(node_new
, struct interface
, node
);
484 interface_start(iface
);
488 static struct interface
* _interface_add(const char *name
, int multicast
, int v6
)
490 struct interface
*iface
;
494 iface
= calloc_a(sizeof(*iface
),
495 &name_buf
, strlen(name
) + 1,
496 &id_buf
, strlen(name
) + 5);
498 sprintf(id_buf
, "%d_%d_%s", multicast
, v6
, name
);
499 iface
->name
= strcpy(name_buf
, name
);
501 iface
->ifindex
= if_nametoindex(name
);
503 iface
->multicast
= multicast
;
506 iface
->mcast_addr
= MCAST_ADDR6
;
508 iface
->mcast_addr
= MCAST_ADDR
;
510 if (iface
->ifindex
<= 0)
513 vlist_add(&interfaces
, &iface
->node
, iface
->id
);
521 int interface_add(const char *name
)
523 struct interface
*v4
= NULL
, *v6
= NULL
, *unicast
;
524 struct ifaddrs
*ifap
, *ifa
;
528 for (ifa
= ifap
; ifa
; ifa
= ifa
->ifa_next
) {
529 if (strcmp(ifa
->ifa_name
, name
))
531 if (ifa
->ifa_addr
->sa_family
== AF_INET
&& !v4
) {
532 struct sockaddr_in
*sa
;
534 if (cfg_proto
&& (cfg_proto
!= 4))
537 unicast
= _interface_add(name
, 0, 0);
540 sa
= (struct sockaddr_in
*) ifa
->ifa_addr
;
541 memcpy(&unicast
->v4_addr
, &sa
->sin_addr
, sizeof(unicast
->v4_addr
));
542 inet_ntop(AF_INET
, &sa
->sin_addr
, unicast
->v4_addrs
, sizeof(unicast
->v4_addrs
));
544 v4
= _interface_add(name
, 1, 0);
547 memcpy(&v4
->v4_addr
, &sa
->sin_addr
, sizeof(v4
->v4_addr
));
548 inet_ntop(AF_INET
, &sa
->sin_addr
, v4
->v4_addrs
, sizeof(v4
->v4_addrs
));
554 if (ifa
->ifa_addr
->sa_family
== AF_INET6
&& !v6
) {
555 uint8_t ll_prefix
[] = {0xfe, 0x80 };
556 struct sockaddr_in6
*sa6
;
558 if (cfg_proto
&& (cfg_proto
!= 6))
561 sa6
= (struct sockaddr_in6
*) ifa
->ifa_addr
;
562 if (memcmp(&sa6
->sin6_addr
, &ll_prefix
, 2))
565 unicast
= _interface_add(name
, 0, 1);
568 memcpy(&unicast
->v6_addr
, &sa6
->sin6_addr
, sizeof(unicast
->v6_addr
));
569 inet_ntop(AF_INET6
, &sa6
->sin6_addr
, unicast
->v6_addrs
, sizeof(unicast
->v6_addrs
));
571 v6
= _interface_add(name
, 1, 1);
574 memcpy(&v6
->v6_addr
, &sa6
->sin6_addr
, sizeof(v6
->v6_addr
));
575 inet_ntop(AF_INET6
, &sa6
->sin6_addr
, v6
->v6_addrs
, sizeof(v6
->v6_addrs
));
587 VLIST_TREE(interfaces
, avl_strcmp
, iface_update_cb
, false, false);