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);
197 fprintf(stderr, "iface: %s\n", iface->name);
198 fprintf(stderr, " v6: %d\n", iface->v6);
199 fprintf(stderr, " multicast: %d\n", iface->multicast);
200 inet_ntop(AF_INET, &from.sin_addr, buf, 256);
201 fprintf(stderr, " src %s:%d\n", buf, from.sin_port);
202 inet_ntop(AF_INET, &inp->ipi_spec_dst, buf, 256);
203 fprintf(stderr, " dst %s\n", buf);
204 inet_ntop(AF_INET, &inp->ipi_addr, buf, 256);
205 fprintf(stderr, " real %s\n", buf);
208 if (inp->ipi_ifindex != iface->ifindex)
209 fprintf(stderr, "invalid iface index %d != %d\n", ifindex, iface->ifindex);
211 dns_handle_packet(iface, buffer, len, 0);
215 read_socket6(struct uloop_fd *u, unsigned int events)
217 struct interface *iface = container_of(u, struct interface, fd);
218 static uint8_t buffer[8 * 1024];
220 char cmsg6[CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(sizeof(int)) + 1];
221 struct cmsghdr *cmsgptr;
224 struct sockaddr_in6 from;
225 int flags = 0, ifindex = -1;
227 struct in6_pktinfo *inp = NULL;
230 interface_close(iface);
231 uloop_timeout_set(&iface->reconnect, 1000);
235 iov[0].iov_base = buffer;
236 iov[0].iov_len = sizeof(buffer);
238 memset(&msg, 0, sizeof(msg));
239 msg.msg_name = (struct sockaddr *) &from;
240 msg.msg_namelen = sizeof(struct sockaddr_in6);
243 msg.msg_control = &cmsg6;
244 msg.msg_controllen = sizeof(cmsg6);
246 len = recvmsg(u->fd, &msg, flags);
248 perror("read failed");
251 for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL; cmsgptr = CMSG_NXTHDR(&msg, cmsgptr)) {
252 void *c = CMSG_DATA(cmsgptr);
254 switch (cmsgptr->cmsg_type) {
256 inp = ((struct in6_pktinfo *) c);
260 ttl = (uint8_t) *((int *) c);
264 fprintf(stderr, "unknown cmsg %x\n", cmsgptr->cmsg_type);
275 fprintf(stderr, "iface: %s\n", iface->name);
276 fprintf(stderr, " v6: %d\n", iface->v6);
277 fprintf(stderr, " multicast: %d\n", iface->multicast);
278 inet_ntop(AF_INET6, &from.sin6_addr, buf, 256);
279 fprintf(stderr, " src %s:%d\n", buf, from.sin6_port);
280 inet_ntop(AF_INET6, &inp->ipi6_addr, buf, 256);
281 fprintf(stderr, " dst %s\n", buf);
284 if (inp->ipi6_ifindex != iface->ifindex)
285 fprintf(stderr, "invalid iface index %d != %d\n", ifindex, iface->ifindex);
287 dns_handle_packet(iface, buffer, len, 0);
291 interface_mcast_setup4(struct interface *iface)
293 struct ip_mreqn mreq;
296 struct sockaddr_in sa = { 0 };
297 int fd = iface->fd.fd;
299 sa.sin_family = AF_INET;
300 sa.sin_port = htons(MCAST_PORT);
301 inet_pton(AF_INET, MCAST_ADDR, &sa.sin_addr);
303 memset(&mreq, 0, sizeof(mreq));
304 mreq.imr_address.s_addr = iface->v4_addr.s_addr;
305 mreq.imr_multiaddr = sa.sin_addr;
306 mreq.imr_ifindex = iface->ifindex;
308 if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0)
309 fprintf(stderr, "ioctl failed: IP_MULTICAST_TTL\n");
311 /* Some network drivers have issues with dropping membership of
312 * mcast groups when the iface is down, but don't allow rejoining
313 * when it comes back up. This is an ugly workaround
314 * -- this was copied from avahi --
316 setsockopt(fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq));
318 if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
319 fprintf(stderr, "failed to join multicast group: %s\n", strerror(errno));
325 if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &no, sizeof(no)) < 0)
326 fprintf(stderr, "ioctl failed: IP_MULTICAST_LOOP\n");
332 interface_socket_setup6(struct interface *iface)
334 struct ipv6_mreq mreq;
337 struct sockaddr_in6 sa = { 0 };
338 int fd = iface->fd.fd;
340 sa.sin6_family = AF_INET6;
341 sa.sin6_port = htons(MCAST_PORT);
342 inet_pton(AF_INET6, MCAST_ADDR6, &sa.sin6_addr);
344 memset(&mreq, 0, sizeof(mreq));
345 mreq.ipv6mr_multiaddr = sa.sin6_addr;
346 mreq.ipv6mr_interface = iface->ifindex;
348 if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) < 0)
349 fprintf(stderr, "ioctl failed: IPV6_MULTICAST_HOPS\n");
351 setsockopt(fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq, sizeof(mreq));
352 if (setsockopt(fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
353 fprintf(stderr, "failed to join multicast group: %s\n", strerror(errno));
359 if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &no, sizeof(no)) < 0)
360 fprintf(stderr, "ioctl failed: IPV6_MULTICAST_LOOP\n");
366 reconnect_socket4(struct uloop_timeout *timeout)
368 struct interface *iface = container_of(timeout, struct interface, reconnect);
371 iface->fd.fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK | USOCK_IPV4ONLY,
372 (iface->multicast) ? (iface->mcast_addr) : (iface->v4_addrs), "5353");
373 if (iface->fd.fd < 0) {
374 fprintf(stderr, "failed to add listener %s: %s\n", iface->mcast_addr, strerror(errno));
378 if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0)
379 fprintf(stderr, "ioctl failed: SO_REUSEADDR\n");
381 if (setsockopt(iface->fd.fd, IPPROTO_IP, IP_RECVTTL, &yes, sizeof(yes)) < 0)
382 fprintf(stderr, "ioctl failed: IP_RECVTTL\n");
384 if (setsockopt(iface->fd.fd, IPPROTO_IP, IP_PKTINFO, &yes, sizeof(yes)) < 0)
385 fprintf(stderr, "ioctl failed: IP_PKTINFO\n");
387 if (iface->multicast && interface_mcast_setup4(iface)) {
392 uloop_fd_add(&iface->fd, ULOOP_READ);
393 if (iface->multicast) {
394 dns_send_question(iface, "_services._dns-sd._udp.local", TYPE_PTR, 1);
395 announce_init(iface);
401 uloop_timeout_set(timeout, 1000);
405 reconnect_socket6(struct uloop_timeout *timeout)
407 struct interface *iface = container_of(timeout, struct interface, reconnect);
408 char mcast_addr[128];
412 snprintf(mcast_addr, sizeof(mcast_addr), "%s%%%s", (iface->multicast) ? (iface->mcast_addr) : (iface->v6_addrs), iface->name);
413 iface->fd.fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK | USOCK_IPV6ONLY, mcast_addr, "5353");
414 if (iface->fd.fd < 0) {
415 fprintf(stderr, "failed to add listener %s: %s\n", mcast_addr, strerror(errno));
419 if (setsockopt(iface->fd.fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)) < 0)
420 fprintf(stderr, "ioctl failed: IPV6_UNICAST_HOPS\n");
422 if (setsockopt(iface->fd.fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &yes, sizeof(yes)) < 0)
423 fprintf(stderr, "ioctl failed: IPV6_RECVPKTINFO\n");
425 if (setsockopt(iface->fd.fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &yes, sizeof(yes)) < 0)
426 fprintf(stderr, "ioctl failed: IPV6_RECVHOPLIMIT\n");
428 if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0)
429 fprintf(stderr, "ioctl failed: SO_REUSEADDR\n");
431 if (iface->multicast && interface_socket_setup6(iface)) {
436 uloop_fd_add(&iface->fd, ULOOP_READ);
438 if (iface->multicast) {
439 dns_send_question(iface, "_services._dns-sd._udp.local", TYPE_PTR, 1);
440 announce_init(iface);
446 uloop_timeout_set(timeout, 1000);
450 static void interface_start(struct interface *iface)
453 iface->fd.cb = read_socket6;
454 iface->reconnect.cb = reconnect_socket6;
456 iface->fd.cb = read_socket4;
457 iface->reconnect.cb = reconnect_socket4;
459 uloop_timeout_set(&iface->reconnect, 100);
463 iface_update_cb(struct vlist_tree *tree, struct vlist_node *node_new,
464 struct vlist_node *node_old)
466 struct interface *iface;
469 iface = container_of(node_old, struct interface, node);
470 interface_free(iface);
474 iface = container_of(node_new, struct interface, node);
475 interface_start(iface);
479 static struct interface* _interface_add(const char *name, int multicast, int v6)
481 struct interface *iface;
485 iface = calloc_a(sizeof(*iface),
486 &name_buf, strlen(name) + 1,
487 &id_buf, strlen(name) + 5);
489 sprintf(id_buf, "%d_%d_%s", multicast, v6, name);
490 iface->name = strcpy(name_buf, name);
492 iface->ifindex = if_nametoindex(name);
494 iface->multicast = multicast;
497 iface->mcast_addr = MCAST_ADDR6;
499 iface->mcast_addr = MCAST_ADDR;
501 if (iface->ifindex <= 0)
504 vlist_add(&interfaces, &iface->node, iface->id);
512 int interface_add(const char *name)
514 struct interface *v4 = NULL, *v6 = NULL, *unicast;
515 struct ifaddrs *ifap, *ifa;
519 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
520 if (strcmp(ifa->ifa_name, name))
522 if (ifa->ifa_addr->sa_family == AF_INET && !v4) {
523 struct sockaddr_in *sa;
525 if (cfg_proto && (cfg_proto != 4))
528 unicast = _interface_add(name, 0, 0);
531 sa = (struct sockaddr_in *) ifa->ifa_addr;
532 memcpy(&unicast->v4_addr, &sa->sin_addr, sizeof(unicast->v4_addr));
533 inet_ntop(AF_INET, &sa->sin_addr, unicast->v4_addrs, sizeof(unicast->v4_addrs));
535 v4 = _interface_add(name, 1, 0);
538 memcpy(&v4->v4_addr, &sa->sin_addr, sizeof(v4->v4_addr));
539 inet_ntop(AF_INET, &sa->sin_addr, v4->v4_addrs, sizeof(v4->v4_addrs));
545 if (ifa->ifa_addr->sa_family == AF_INET6 && !v6) {
546 uint8_t ll_prefix[] = {0xfe, 0x80 };
547 struct sockaddr_in6 *sa6;
549 if (cfg_proto && (cfg_proto != 6))
552 sa6 = (struct sockaddr_in6 *) ifa->ifa_addr;
553 if (memcmp(&sa6->sin6_addr, &ll_prefix, 2))
556 unicast = _interface_add(name, 0, 1);
559 memcpy(&unicast->v6_addr, &sa6->sin6_addr, sizeof(unicast->v6_addr));
560 inet_ntop(AF_INET6, &sa6->sin6_addr, unicast->v6_addrs, sizeof(unicast->v6_addrs));
562 v6 = _interface_add(name, 1, 1);
565 memcpy(&v6->v6_addr, &sa6->sin6_addr, sizeof(v6->v6_addr));
566 inet_ntop(AF_INET6, &sa6->sin6_addr, v6->v6_addrs, sizeof(v6->v6_addrs));
578 VLIST_TREE(interfaces, avl_strcmp, iface_update_cb, false, false);