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 return interface_send_packet6(iface
, iov
, iov_len
);
116 return interface_send_packet4(iface
, iov
, iov_len
);
119 static void interface_close(struct interface
*iface
)
121 if (iface
->fd
.fd
< 0)
124 announce_free(iface
);
125 uloop_fd_delete(&iface
->fd
);
130 static void interface_free(struct interface
*iface
)
132 interface_close(iface
);
137 read_socket4(struct uloop_fd
*u
, unsigned int events
)
139 struct interface
*iface
= container_of(u
, struct interface
, fd
);
140 static uint8_t buffer
[8 * 1024];
142 char cmsg
[CMSG_SPACE(sizeof(struct in_pktinfo
)) + CMSG_SPACE(sizeof(int)) + 1];
143 struct cmsghdr
*cmsgptr
;
146 struct sockaddr_in from
;
147 int flags
= 0, ifindex
= -1;
149 struct in_pktinfo
*inp
= NULL
;
152 interface_close(iface
);
153 uloop_timeout_set(&iface
->reconnect
, 1000);
157 iov
[0].iov_base
= buffer
;
158 iov
[0].iov_len
= sizeof(buffer
);
160 memset(&msg
, 0, sizeof(msg
));
161 msg
.msg_name
= (struct sockaddr
*) &from
;
162 msg
.msg_namelen
= sizeof(struct sockaddr_in
);
165 msg
.msg_control
= &cmsg
;
166 msg
.msg_controllen
= sizeof(cmsg
);
168 len
= recvmsg(u
->fd
, &msg
, flags
);
170 perror("read failed");
173 for (cmsgptr
= CMSG_FIRSTHDR(&msg
); cmsgptr
!= NULL
; cmsgptr
= CMSG_NXTHDR(&msg
, cmsgptr
)) {
174 void *c
= CMSG_DATA(cmsgptr
);
176 switch (cmsgptr
->cmsg_type
) {
178 inp
= ((struct in_pktinfo
*) c
);
182 ttl
= (uint8_t) *((int *) c
);
186 fprintf(stderr
, "unknown cmsg %x\n", cmsgptr
->cmsg_type
);
194 inet_ntop(AF_INET
, &from
.sin_addr
, buf
, 256);
195 fprintf(stderr
, "%s:%s[%d]%s:%d\n", __FILE__
, __func__
, __LINE__
, buf
, from
.sin_port
);
196 inet_ntop(AF_INET
, &inp
->ipi_spec_dst
, buf
, 256);
197 fprintf(stderr
, "%s:%s[%d]%s:%d\n", __FILE__
, __func__
, __LINE__
, buf
, from
.sin_port
);
198 inet_ntop(AF_INET
, &inp
->ipi_addr
, buf
, 256);
199 fprintf(stderr
, "%s:%s[%d]%s:%d\n", __FILE__
, __func__
, __LINE__
, buf
, from
.sin_port
);
202 if (inp
->ipi_ifindex
!= iface
->ifindex
)
203 fprintf(stderr
, "invalid iface index %d != %d\n", ifindex
, iface
->ifindex
);
205 dns_handle_packet(iface
, buffer
, len
, 0);
209 read_socket6(struct uloop_fd
*u
, unsigned int events
)
211 struct interface
*iface
= container_of(u
, struct interface
, fd
);
212 static uint8_t buffer
[8 * 1024];
214 char cmsg6
[CMSG_SPACE(sizeof(struct in6_pktinfo
)) + 1];
215 struct cmsghdr
*cmsgptr
;
218 struct sockaddr_in6 from
;
219 int flags
= 0, ifindex
= -1;
222 interface_close(iface
);
223 uloop_timeout_set(&iface
->reconnect
, 1000);
227 iov
[0].iov_base
= buffer
;
228 iov
[0].iov_len
= sizeof(buffer
);
230 memset(&msg
, 0, sizeof(msg
));
231 msg
.msg_name
= (struct sockaddr
*) &from
;
232 msg
.msg_namelen
= (iface
->v6
) ? (sizeof(struct sockaddr_in6
)) : (sizeof(struct sockaddr_in
));
235 msg
.msg_control
= &cmsg6
;
236 msg
.msg_controllen
= sizeof(cmsg6
);
238 len
= recvmsg(u
->fd
, &msg
, flags
);
240 perror("read failed");
243 for (cmsgptr
= CMSG_FIRSTHDR(&msg
); cmsgptr
!= NULL
; cmsgptr
= CMSG_NXTHDR(&msg
, cmsgptr
)) {
244 void *c
= CMSG_DATA(cmsgptr
);
246 if (cmsgptr
->cmsg_level
== IPPROTO_IP
&& cmsgptr
->cmsg_type
== IP_PKTINFO
)
247 ifindex
= ((struct in_pktinfo
*) c
)->ipi_ifindex
;
248 else if (cmsgptr
->cmsg_level
== IPPROTO_IPV6
&& cmsgptr
->cmsg_type
== IPV6_PKTINFO
)
249 ifindex
= ((struct in6_pktinfo
*) c
)->ipi6_ifindex
;
251 if (ifindex
!= iface
->ifindex
)
252 fprintf(stderr
, "invalid iface index %d != %d\n", ifindex
, iface
->ifindex
);
254 dns_handle_packet(iface
, buffer
, len
, 0);
258 interface_mcast_setup4(struct interface
*iface
)
260 struct ip_mreqn mreq
;
263 struct sockaddr_in sa
= { 0 };
264 int fd
= iface
->fd
.fd
;
266 sa
.sin_family
= AF_INET
;
267 sa
.sin_port
= htons(MCAST_PORT
);
268 inet_pton(AF_INET
, MCAST_ADDR
, &sa
.sin_addr
);
270 memset(&mreq
, 0, sizeof(mreq
));
271 mreq
.imr_address
.s_addr
= iface
->v4_addr
.s_addr
;
272 mreq
.imr_multiaddr
= sa
.sin_addr
;
273 mreq
.imr_ifindex
= iface
->ifindex
;
275 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_TTL
, &ttl
, sizeof(ttl
)) < 0)
276 fprintf(stderr
, "ioctl failed: IP_MULTICAST_TTL\n");
278 /* Some network drivers have issues with dropping membership of
279 * mcast groups when the iface is down, but don't allow rejoining
280 * when it comes back up. This is an ugly workaround
281 * -- this was copied from avahi --
283 setsockopt(fd
, IPPROTO_IP
, IP_DROP_MEMBERSHIP
, &mreq
, sizeof(mreq
));
285 if (setsockopt(fd
, IPPROTO_IP
, IP_ADD_MEMBERSHIP
, &mreq
, sizeof(mreq
)) < 0) {
286 fprintf(stderr
, "failed to join multicast group: %s\n", strerror(errno
));
292 if (setsockopt(fd
, IPPROTO_IP
, IP_MULTICAST_LOOP
, &no
, sizeof(no
)) < 0)
293 fprintf(stderr
, "ioctl failed: IP_MULTICAST_LOOP\n");
299 interface_socket_setup6(struct interface
*iface
)
301 struct ipv6_mreq mreq
;
304 struct sockaddr_in6 sa
= { 0 };
305 int fd
= iface
->fd
.fd
;
307 sa
.sin6_family
= AF_INET6
;
308 sa
.sin6_port
= htons(MCAST_PORT
);
309 inet_pton(AF_INET6
, MCAST_ADDR6
, &sa
.sin6_addr
);
311 memset(&mreq
, 0, sizeof(mreq
));
312 mreq
.ipv6mr_multiaddr
= sa
.sin6_addr
;
313 mreq
.ipv6mr_interface
= iface
->ifindex
;
315 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_MULTICAST_HOPS
, &ttl
, sizeof(ttl
)) < 0)
316 fprintf(stderr
, "ioctl failed: IPV6_MULTICAST_HOPS\n");
318 setsockopt(fd
, IPPROTO_IPV6
, IPV6_LEAVE_GROUP
, &mreq
, sizeof(mreq
));
319 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_ADD_MEMBERSHIP
, &mreq
, sizeof(mreq
)) < 0) {
320 fprintf(stderr
, "failed to join multicast group: %s\n", strerror(errno
));
326 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_MULTICAST_LOOP
, &no
, sizeof(no
)) < 0)
327 fprintf(stderr
, "ioctl failed: IPV6_MULTICAST_LOOP\n");
333 reconnect_socket4(struct uloop_timeout
*timeout
)
335 struct interface
*iface
= container_of(timeout
, struct interface
, reconnect
);
338 iface
->fd
.fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
| USOCK_IPV4ONLY
, iface
->mcast_addr
, "5353");
339 if (iface
->fd
.fd
< 0) {
340 fprintf(stderr
, "failed to add listener %s: %s\n", iface
->mcast_addr
, strerror(errno
));
344 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_REUSEADDR
, &yes
, sizeof(yes
)) < 0)
345 fprintf(stderr
, "ioctl failed: SO_REUSEADDR\n");
347 if (setsockopt(iface
->fd
.fd
, IPPROTO_IP
, IP_RECVTTL
, &yes
, sizeof(yes
)) < 0)
348 fprintf(stderr
, "ioctl failed: IP_RECVTTL\n");
350 if (setsockopt(iface
->fd
.fd
, IPPROTO_IP
, IP_PKTINFO
, &yes
, sizeof(yes
)) < 0)
351 fprintf(stderr
, "ioctl failed: IP_PKTINFO\n");
353 if (interface_mcast_setup4(iface
)) {
358 uloop_fd_add(&iface
->fd
, ULOOP_READ
);
359 dns_send_question(iface
, "_services._dns-sd._udp.local", TYPE_PTR
);
360 announce_init(iface
);
365 uloop_timeout_set(timeout
, 1000);
369 reconnect_socket6(struct uloop_timeout
*timeout
)
371 struct interface
*iface
= container_of(timeout
, struct interface
, reconnect
);
372 char mcast_addr
[128];
376 snprintf(mcast_addr
, sizeof(mcast_addr
), "%s%%%s", iface
->mcast_addr
, iface
->name
);
377 iface
->fd
.fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
| USOCK_IPV6ONLY
, mcast_addr
, "5353");
378 if (iface
->fd
.fd
< 0) {
379 fprintf(stderr
, "failed to add listener %s: %s\n", mcast_addr
, strerror(errno
));
383 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_UNICAST_HOPS
, &ttl
, sizeof(ttl
)) < 0)
384 fprintf(stderr
, "ioctl failed: IPV6_UNICAST_HOPS\n");
386 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &yes
, sizeof(yes
)) < 0)
387 fprintf(stderr
, "ioctl failed: IPV6_RECVPKTINFO\n");
389 if (setsockopt(iface
->fd
.fd
, IPPROTO_IPV6
, IPV6_RECVHOPLIMIT
, &yes
, sizeof(yes
)) < 0)
390 fprintf(stderr
, "ioctl failed: IPV6_RECVHOPLIMIT\n");
392 if (setsockopt(iface
->fd
.fd
, SOL_SOCKET
, SO_REUSEADDR
, &yes
, sizeof(yes
)) < 0)
393 fprintf(stderr
, "ioctl failed: SO_REUSEADDR\n");
395 if (interface_socket_setup6(iface
)) {
400 uloop_fd_add(&iface
->fd
, ULOOP_READ
);
401 dns_send_question(iface
, "_services._dns-sd._udp.local", TYPE_PTR
);
402 announce_init(iface
);
406 uloop_timeout_set(timeout
, 1000);
410 static void interface_start(struct interface
*iface
)
413 iface
->fd
.cb
= read_socket6
;
414 iface
->reconnect
.cb
= reconnect_socket6
;
416 iface
->fd
.cb
= read_socket4
;
417 iface
->reconnect
.cb
= reconnect_socket4
;
419 uloop_timeout_set(&iface
->reconnect
, 100);
423 iface_update_cb(struct vlist_tree
*tree
, struct vlist_node
*node_new
,
424 struct vlist_node
*node_old
)
426 struct interface
*iface
;
429 iface
= container_of(node_old
, struct interface
, node
);
430 interface_free(iface
);
434 iface
= container_of(node_new
, struct interface
, node
);
435 interface_start(iface
);
439 static struct interface
* _interface_add(const char *name
, int v6
)
441 struct interface
*iface
;
445 iface
= calloc_a(sizeof(*iface
),
446 &name_buf
, strlen(name
) + 1,
447 &id_buf
, strlen(name
) + 3);
449 sprintf(id_buf
, "%d_%s", v6
, name
);
450 iface
->name
= strcpy(name_buf
, name
);
452 iface
->ifindex
= if_nametoindex(name
);
456 iface
->mcast_addr
= MCAST_ADDR6
;
458 iface
->mcast_addr
= MCAST_ADDR
;
460 if (iface
->ifindex
<= 0)
463 vlist_add(&interfaces
, &iface
->node
, iface
->id
);
471 int interface_add(const char *name
)
473 struct interface
*v4
= NULL
, *v6
= NULL
;
474 struct ifaddrs
*ifap
, *ifa
;
478 for (ifa
= ifap
; ifa
; ifa
= ifa
->ifa_next
) {
479 if (strcmp(ifa
->ifa_name
, name
))
481 if (ifa
->ifa_addr
->sa_family
== AF_INET
&& !v4
) {
482 struct sockaddr_in
*sa
;
484 if (cfg_proto
&& (cfg_proto
!= 4))
487 v4
= _interface_add(name
, 0);
491 sa
= (struct sockaddr_in
*) ifa
->ifa_addr
;
492 memcpy(&v4
->v4_addr
, &sa
->sin_addr
, sizeof(v4
->v4_addr
));
495 if (ifa
->ifa_addr
->sa_family
== AF_INET6
&& !v6
) {
496 uint8_t ll_prefix
[] = {0xfe, 0x80 };
497 struct sockaddr_in6
*sa6
;
499 if (cfg_proto
&& (cfg_proto
!= 6))
502 sa6
= (struct sockaddr_in6
*) ifa
->ifa_addr
;
503 if (memcmp(&sa6
->sin6_addr
, &ll_prefix
, 2))
506 v6
= _interface_add(name
, 1);
509 memcpy(&v6
->v6_addr
, &sa6
->sin6_addr
, sizeof(v6
->v6_addr
));
518 VLIST_TREE(interfaces
, avl_strcmp
, iface_update_cb
, false, false);