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 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 a
.sin_addr
.s_addr
= inet_addr(MCAST_ADDR
);
74 return sendmsg(fd
, &m
, 0);
78 interface_send_packet6(struct interface
*iface
, struct iovec
*iov
, int iov_len
)
80 static size_t cmsg_data
[( CMSG_SPACE(sizeof(struct in6_pktinfo
)) / sizeof(size_t)) + 1];
81 static struct sockaddr_in6 a
;
82 static struct msghdr m
= {
83 .msg_name
= (struct sockaddr
*) &a
,
84 .msg_namelen
= sizeof(a
),
85 .msg_control
= cmsg_data
,
86 .msg_controllen
= CMSG_LEN(sizeof(struct in6_pktinfo
)),
88 struct in6_pktinfo
*pkti
;
90 int fd
= iface
->fd
.fd
;
92 a
.sin6_family
= AF_INET6
;
93 a
.sin6_port
= htons(MCAST_PORT
);
95 m
.msg_iovlen
= iov_len
;
97 memset(cmsg_data
, 0, sizeof(cmsg_data
));
98 cmsg
= CMSG_FIRSTHDR(&m
);
99 cmsg
->cmsg_len
= m
.msg_controllen
;
100 cmsg
->cmsg_level
= IPPROTO_IPV6
;
101 cmsg
->cmsg_type
= IPV6_PKTINFO
;
103 pkti
= (struct in6_pktinfo
*) CMSG_DATA(cmsg
);
104 pkti
->ipi6_ifindex
= iface
->ifindex
;
106 inet_pton(AF_INET6
, MCAST_ADDR6
, &a
.sin6_addr
);
108 return sendmsg(fd
, &m
, 0);
112 interface_send_packet(struct interface
*iface
, struct iovec
*iov
, int iov_len
)
115 fprintf(stderr
, "TX ipv%d: %s\n", iface
->v6
* 2 + 4, iface
->name
);
116 fprintf(stderr
, " multicast: %d\n", iface
->multicast
);
120 return interface_send_packet6(iface
, iov
, iov_len
);
122 return interface_send_packet4(iface
, iov
, iov_len
);
125 static void interface_close(struct interface
*iface
)
127 if (iface
->fd
.fd
< 0)
130 announce_free(iface
);
131 uloop_fd_delete(&iface
->fd
);
136 static void interface_free(struct interface
*iface
)
138 interface_close(iface
);
143 interface_valid_src(void *ip1
, void *mask
, void *ip2
, int len
)
153 for (i
= 0; i
< len
; i
++, i1
++, i2
++, m
++) {
154 if ((*i1
& *m
) != (*i2
& *m
))
162 read_socket4(struct uloop_fd
*u
, unsigned int events
)
164 struct interface
*iface
= container_of(u
, struct interface
, fd
);
165 static uint8_t buffer
[8 * 1024];
167 char cmsg
[CMSG_SPACE(sizeof(struct in_pktinfo
)) + CMSG_SPACE(sizeof(int)) + 1];
168 struct cmsghdr
*cmsgptr
;
171 struct sockaddr_in from
;
172 int flags
= 0, ifindex
= -1;
174 struct in_pktinfo
*inp
= NULL
;
177 interface_close(iface
);
178 uloop_timeout_set(&iface
->reconnect
, 1000);
182 iov
[0].iov_base
= buffer
;
183 iov
[0].iov_len
= sizeof(buffer
);
185 memset(&msg
, 0, sizeof(msg
));
186 msg
.msg_name
= (struct sockaddr
*) &from
;
187 msg
.msg_namelen
= sizeof(struct sockaddr_in
);
190 msg
.msg_control
= &cmsg
;
191 msg
.msg_controllen
= sizeof(cmsg
);
193 len
= recvmsg(u
->fd
, &msg
, flags
);
195 perror("read failed");
198 for (cmsgptr
= CMSG_FIRSTHDR(&msg
); cmsgptr
!= NULL
; cmsgptr
= CMSG_NXTHDR(&msg
, cmsgptr
)) {
199 void *c
= CMSG_DATA(cmsgptr
);
201 switch (cmsgptr
->cmsg_type
) {
203 inp
= ((struct in_pktinfo
*) c
);
207 ttl
= (uint8_t) *((int *) c
);
211 fprintf(stderr
, "unknown cmsg %x\n", cmsgptr
->cmsg_type
);
222 fprintf(stderr
, "RX ipv4: %s\n", iface
->name
);
223 fprintf(stderr
, " multicast: %d\n", iface
->multicast
);
224 inet_ntop(AF_INET
, &from
.sin_addr
, buf
, 256);
225 fprintf(stderr
, " src %s:%d\n", buf
, from
.sin_port
);
226 inet_ntop(AF_INET
, &inp
->ipi_spec_dst
, buf
, 256);
227 fprintf(stderr
, " dst %s\n", buf
);
228 inet_ntop(AF_INET
, &inp
->ipi_addr
, buf
, 256);
229 fprintf(stderr
, " real %s\n", buf
);
232 if (inp
->ipi_ifindex
!= iface
->ifindex
)
233 fprintf(stderr
, "invalid iface index %d != %d\n", ifindex
, iface
->ifindex
);
234 else if (!interface_valid_src((void *) &iface
->v4_addr
, (void *) &iface
->v4_netmask
, (void *) &from
.sin_addr
, 4))
235 dns_handle_packet(iface
, (struct sockaddr
*) &from
, from
.sin_port
, buffer
, len
);
239 read_socket6(struct uloop_fd
*u
, unsigned int events
)
241 struct interface
*iface
= container_of(u
, struct interface
, fd
);
242 static uint8_t buffer
[8 * 1024];
244 char cmsg6
[CMSG_SPACE(sizeof(struct in6_pktinfo
)) + CMSG_SPACE(sizeof(int)) + 1];
245 struct cmsghdr
*cmsgptr
;
248 struct sockaddr_in6 from
;
249 int flags
= 0, ifindex
= -1;
251 struct in6_pktinfo
*inp
= NULL
;
254 interface_close(iface
);
255 uloop_timeout_set(&iface
->reconnect
, 1000);
259 iov
[0].iov_base
= buffer
;
260 iov
[0].iov_len
= sizeof(buffer
);
262 memset(&msg
, 0, sizeof(msg
));
263 msg
.msg_name
= (struct sockaddr
*) &from
;
264 msg
.msg_namelen
= sizeof(struct sockaddr_in6
);
267 msg
.msg_control
= &cmsg6
;
268 msg
.msg_controllen
= sizeof(cmsg6
);
270 len
= recvmsg(u
->fd
, &msg
, flags
);
272 perror("read failed");
275 for (cmsgptr
= CMSG_FIRSTHDR(&msg
); cmsgptr
!= NULL
; cmsgptr
= CMSG_NXTHDR(&msg
, cmsgptr
)) {
276 void *c
= CMSG_DATA(cmsgptr
);
278 switch (cmsgptr
->cmsg_type
) {
280 inp
= ((struct in6_pktinfo
*) c
);
284 ttl
= (uint8_t) *((int *) c
);
288 fprintf(stderr
, "unknown cmsg %x\n", cmsgptr
->cmsg_type
);
299 fprintf(stderr
, "RX ipv6: %s\n", iface
->name
);
300 fprintf(stderr
, " multicast: %d\n", iface
->multicast
);
301 inet_ntop(AF_INET6
, &from
.sin6_addr
, buf
, 256);
302 fprintf(stderr
, " src %s:%d\n", buf
, from
.sin6_port
);
303 inet_ntop(AF_INET6
, &inp
->ipi6_addr
, buf
, 256);
304 fprintf(stderr
, " dst %s\n", buf
);
307 if (inp
->ipi6_ifindex
!= iface
->ifindex
)
308 fprintf(stderr
, "invalid iface index %d != %d\n", ifindex
, iface
->ifindex
);
309 else if (!interface_valid_src((void *) &iface
->v4_addr
, (void *) &iface
->v4_netmask
, (void *) &from
.sin6_addr
, 16))
310 dns_handle_packet(iface
, (struct sockaddr
*) &from
, from
.sin6_port
, buffer
, len
);
314 interface_mcast_setup4(struct interface
*iface
)
316 struct ip_mreqn mreq
;
319 struct sockaddr_in sa
= { 0 };
320 int fd
= iface
->fd
.fd
;
322 sa
.sin_family
= AF_INET
;
323 sa
.sin_port
= htons(MCAST_PORT
);
324 inet_pton(AF_INET
, MCAST_ADDR
, &sa
.sin_addr
);
326 memset(&mreq
, 0, sizeof(mreq
));
327 mreq
.imr_address
.s_addr
= iface
->v4_addr
.s_addr
;
328 mreq
.imr_multiaddr
= sa
.sin_addr
;
329 mreq
.imr_ifindex
= iface
->ifindex
;
331 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_TTL
, &ttl
, sizeof(ttl
)) < 0)
332 fprintf(stderr
, "ioctl failed: IP_MULTICAST_TTL\n");
334 /* Some network drivers have issues with dropping membership of
335 * mcast groups when the iface is down, but don't allow rejoining
336 * when it comes back up. This is an ugly workaround
337 * -- this was copied from avahi --
339 setsockopt(fd
, IPPROTO_IP
, IP_DROP_MEMBERSHIP
, &mreq
, sizeof(mreq
));
341 if (setsockopt(fd
, IPPROTO_IP
, IP_ADD_MEMBERSHIP
, &mreq
, sizeof(mreq
)) < 0) {
342 fprintf(stderr
, "failed to join multicast group: %s\n", strerror(errno
));
348 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_LOOP
, &no
, sizeof(no
)) < 0)
349 fprintf(stderr
, "ioctl failed: IP_MULTICAST_LOOP\n");
355 interface_socket_setup6(struct interface
*iface
)
357 struct ipv6_mreq mreq
;
360 struct sockaddr_in6 sa
= { 0 };
361 int fd
= iface
->fd
.fd
;
363 sa
.sin6_family
= AF_INET6
;
364 sa
.sin6_port
= htons(MCAST_PORT
);
365 inet_pton(AF_INET6
, MCAST_ADDR6
, &sa
.sin6_addr
);
367 memset(&mreq
, 0, sizeof(mreq
));
368 mreq
.ipv6mr_multiaddr
= sa
.sin6_addr
;
369 mreq
.ipv6mr_interface
= iface
->ifindex
;
371 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_MULTICAST_HOPS
, &ttl
, sizeof(ttl
)) < 0)
372 fprintf(stderr
, "ioctl failed: IPV6_MULTICAST_HOPS\n");
374 setsockopt(fd
, IPPROTO_IPV6
, IPV6_LEAVE_GROUP
, &mreq
, sizeof(mreq
));
375 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_ADD_MEMBERSHIP
, &mreq
, sizeof(mreq
)) < 0) {
376 fprintf(stderr
, "failed to join multicast group: %s\n", strerror(errno
));
382 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_MULTICAST_LOOP
, &no
, sizeof(no
)) < 0)
383 fprintf(stderr
, "ioctl failed: IPV6_MULTICAST_LOOP\n");
389 reconnect_socket4(struct uloop_timeout
*timeout
)
391 struct interface
*iface
= container_of(timeout
, struct interface
, reconnect
);
394 iface
->fd
.fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
| USOCK_IPV4ONLY
,
395 (iface
->multicast
) ? (iface
->mcast_addr
) : (iface
->v4_addrs
), "5353");
396 if (iface
->fd
.fd
< 0) {
397 fprintf(stderr
, "failed to add listener %s: %s\n", iface
->mcast_addr
, strerror(errno
));
401 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_BINDTODEVICE
, iface
->name
, strlen(iface
->name
) < 0))
402 fprintf(stderr
, "ioctl failed: SO_BINDTODEVICE\n");
404 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_REUSEADDR
, &yes
, sizeof(yes
)) < 0)
405 fprintf(stderr
, "ioctl failed: SO_REUSEADDR\n");
407 if (setsockopt(iface
->fd
.fd
, IPPROTO_IP
, IP_RECVTTL
, &yes
, sizeof(yes
)) < 0)
408 fprintf(stderr
, "ioctl failed: IP_RECVTTL\n");
410 if (setsockopt(iface
->fd
.fd
, IPPROTO_IP
, IP_PKTINFO
, &yes
, sizeof(yes
)) < 0)
411 fprintf(stderr
, "ioctl failed: IP_PKTINFO\n");
413 if (iface
->multicast
&& interface_mcast_setup4(iface
)) {
418 uloop_fd_add(&iface
->fd
, ULOOP_READ
);
419 if (iface
->multicast
) {
420 dns_send_question(iface
, "_services._dns-sd._udp.local", TYPE_PTR
, 1);
421 announce_init(iface
);
427 uloop_timeout_set(timeout
, 1000);
431 reconnect_socket6(struct uloop_timeout
*timeout
)
433 struct interface
*iface
= container_of(timeout
, struct interface
, reconnect
);
434 char mcast_addr
[128];
438 snprintf(mcast_addr
, sizeof(mcast_addr
), "%s%%%s", (iface
->multicast
) ? (iface
->mcast_addr
) : (iface
->v6_addrs
), iface
->name
);
439 iface
->fd
.fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
| USOCK_IPV6ONLY
, mcast_addr
, "5353");
440 if (iface
->fd
.fd
< 0) {
441 fprintf(stderr
, "failed to add listener %s: %s\n", mcast_addr
, strerror(errno
));
445 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_BINDTODEVICE
, iface
->name
, strlen(iface
->name
) < 0))
446 fprintf(stderr
, "ioctl failed: SO_BINDTODEVICE\n");
448 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_UNICAST_HOPS
, &ttl
, sizeof(ttl
)) < 0)
449 fprintf(stderr
, "ioctl failed: IPV6_UNICAST_HOPS\n");
451 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &yes
, sizeof(yes
)) < 0)
452 fprintf(stderr
, "ioctl failed: IPV6_RECVPKTINFO\n");
454 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_RECVHOPLIMIT
, &yes
, sizeof(yes
)) < 0)
455 fprintf(stderr
, "ioctl failed: IPV6_RECVHOPLIMIT\n");
457 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_REUSEADDR
, &yes
, sizeof(yes
)) < 0)
458 fprintf(stderr
, "ioctl failed: SO_REUSEADDR\n");
460 if (iface
->multicast
&& interface_socket_setup6(iface
)) {
465 uloop_fd_add(&iface
->fd
, ULOOP_READ
);
467 if (iface
->multicast
) {
468 dns_send_question(iface
, "_services._dns-sd._udp.local", TYPE_PTR
, 1);
469 announce_init(iface
);
475 uloop_timeout_set(timeout
, 1000);
479 static void interface_start(struct interface
*iface
)
482 iface
->fd
.cb
= read_socket6
;
483 iface
->reconnect
.cb
= reconnect_socket6
;
485 iface
->fd
.cb
= read_socket4
;
486 iface
->reconnect
.cb
= reconnect_socket4
;
488 uloop_timeout_set(&iface
->reconnect
, 100);
492 iface_update_cb(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
493 struct vlist_node
*node_old
)
495 struct interface
*iface
;
498 iface
= container_of(node_old
, struct interface
, node
);
499 interface_free(iface
);
503 iface
= container_of(node_new
, struct interface
, node
);
504 interface_start(iface
);
508 static struct interface
* _interface_add(const char *name
, int multicast
, int v6
)
510 struct interface
*iface
;
514 iface
= calloc_a(sizeof(*iface
),
515 &name_buf
, strlen(name
) + 1,
516 &id_buf
, strlen(name
) + 5);
518 sprintf(id_buf
, "%d_%d_%s", multicast
, v6
, name
);
519 iface
->name
= strcpy(name_buf
, name
);
521 iface
->ifindex
= if_nametoindex(name
);
523 iface
->multicast
= multicast
;
526 iface
->mcast_addr
= MCAST_ADDR6
;
528 iface
->mcast_addr
= MCAST_ADDR
;
530 if (iface
->ifindex
<= 0)
533 vlist_add(&interfaces
, &iface
->node
, iface
->id
);
541 int interface_add(const char *name
)
543 struct interface
*v4
= NULL
, *v6
= NULL
, *unicast
;
544 struct ifaddrs
*ifap
, *ifa
;
548 for (ifa
= ifap
; ifa
; ifa
= ifa
->ifa_next
) {
549 if (strcmp(ifa
->ifa_name
, name
))
551 if (ifa
->ifa_addr
->sa_family
== AF_INET
&& !v4
) {
552 struct sockaddr_in
*sa
;
554 if (cfg_proto
&& (cfg_proto
!= 4))
557 unicast
= _interface_add(name
, 0, 0);
560 v4
= _interface_add(name
, 1, 0);
564 sa
= (struct sockaddr_in
*) ifa
->ifa_addr
;
565 memcpy(&v4
->v4_addr
, &sa
->sin_addr
, sizeof(v4
->v4_addr
));
566 memcpy(&unicast
->v4_addr
, &sa
->sin_addr
, sizeof(unicast
->v4_addr
));
568 inet_ntop(AF_INET
, &sa
->sin_addr
, v4
->v4_addrs
, sizeof(v4
->v4_addrs
));
569 inet_ntop(AF_INET
, &sa
->sin_addr
, unicast
->v4_addrs
, sizeof(unicast
->v4_addrs
));
571 sa
= (struct sockaddr_in
*) ifa
->ifa_netmask
;
572 memcpy(&unicast
->v4_netmask
, &sa
->sin_addr
, sizeof(unicast
->v4_netmask
));
573 memcpy(&v4
->v4_netmask
, &sa
->sin_addr
, sizeof(v4
->v4_netmask
));
579 if (ifa
->ifa_addr
->sa_family
== AF_INET6
&& !v6
) {
580 uint8_t ll_prefix
[] = {0xfe, 0x80 };
581 struct sockaddr_in6
*sa6
;
583 if (cfg_proto
&& (cfg_proto
!= 6))
586 sa6
= (struct sockaddr_in6
*) ifa
->ifa_addr
;
587 if (memcmp(&sa6
->sin6_addr
, &ll_prefix
, 2))
590 unicast
= _interface_add(name
, 0, 1);
593 v6
= _interface_add(name
, 1, 1);
597 memcpy(&v6
->v6_addr
, &sa6
->sin6_addr
, sizeof(v6
->v6_addr
));
598 memcpy(&unicast
->v6_addr
, &sa6
->sin6_addr
, sizeof(unicast
->v6_addr
));
600 inet_ntop(AF_INET6
, &sa6
->sin6_addr
, v6
->v6_addrs
, sizeof(v6
->v6_addrs
));
601 inet_ntop(AF_INET6
, &sa6
->sin6_addr
, unicast
->v6_addrs
, sizeof(unicast
->v6_addrs
));
603 sa6
= (struct sockaddr_in6
*) ifa
->ifa_netmask
;
604 memcpy(&v6
->v6_netmask
, &sa6
->sin6_addr
, sizeof(v6
->v6_netmask
));
605 memcpy(&unicast
->v6_netmask
, &sa6
->sin6_addr
, sizeof(unicast
->v6_netmask
));
617 void interface_shutdown(void)
619 struct interface
*iface
;
621 vlist_for_each_element(&interfaces
, iface
, node
)
622 if (iface
->fd
.fd
> 0 && iface
->multicast
) {
623 service_announce(iface
, 0);
624 service_reply_a(iface
, 0);
626 vlist_for_each_element(&interfaces
, iface
, node
)
627 interface_close(iface
);
630 VLIST_TREE(interfaces
, avl_strcmp
, iface_update_cb
, false, false);