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 sockaddr_in *to, 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 if (iface->multicast || !to) {
73 a.sin_addr.s_addr = inet_addr(MCAST_ADDR);
75 fprintf(stderr, "Ignoring IPv4 address for multicast interface\n");
77 a.sin_addr.s_addr = to->sin_addr.s_addr;
80 return sendmsg(fd, &m, 0);
84 interface_send_packet6(struct interface *iface, struct sockaddr_in6 *to, struct iovec *iov, int iov_len)
86 static size_t cmsg_data[( CMSG_SPACE(sizeof(struct in6_pktinfo)) / sizeof(size_t)) + 1];
87 static struct sockaddr_in6 a;
88 static struct msghdr m = {
89 .msg_name = (struct sockaddr *) &a,
90 .msg_namelen = sizeof(a),
91 .msg_control = cmsg_data,
92 .msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)),
94 struct in6_pktinfo *pkti;
96 int fd = iface->fd.fd;
98 a.sin6_family = AF_INET6;
99 a.sin6_port = htons(MCAST_PORT);
101 m.msg_iovlen = iov_len;
103 memset(cmsg_data, 0, sizeof(cmsg_data));
104 cmsg = CMSG_FIRSTHDR(&m);
105 cmsg->cmsg_len = m.msg_controllen;
106 cmsg->cmsg_level = IPPROTO_IPV6;
107 cmsg->cmsg_type = IPV6_PKTINFO;
109 pkti = (struct in6_pktinfo*) CMSG_DATA(cmsg);
110 pkti->ipi6_ifindex = iface->ifindex;
112 if (iface->multicast || !to) {
113 inet_pton(AF_INET6, MCAST_ADDR6, &a.sin6_addr);
115 fprintf(stderr, "Ignoring IPv6 address for multicast interface\n");
117 a.sin6_addr = to->sin6_addr;
120 return sendmsg(fd, &m, 0);
124 interface_send_packet(struct interface *iface, struct sockaddr *to, struct iovec *iov, int iov_len)
127 fprintf(stderr, "TX ipv%d: %s\n", iface->v6 * 2 + 4, iface->name);
128 fprintf(stderr, " multicast: %d\n", iface->multicast);
132 return interface_send_packet6(iface, (struct sockaddr_in6 *)to, iov, iov_len);
134 return interface_send_packet4(iface, (struct sockaddr_in *)to, iov, iov_len);
137 static void interface_close(struct interface *iface)
139 if (iface->fd.fd < 0)
142 announce_free(iface);
143 uloop_fd_delete(&iface->fd);
148 static void interface_free(struct interface *iface)
150 interface_close(iface);
155 interface_valid_src(void *ip1, void *mask, void *ip2, int len)
165 for (i = 0; i < len; i++, i1++, i2++, m++) {
166 if ((*i1 & *m) != (*i2 & *m))
174 read_socket4(struct uloop_fd *u, unsigned int events)
176 struct interface *iface = container_of(u, struct interface, fd);
177 static uint8_t buffer[8 * 1024];
179 char cmsg[CMSG_SPACE(sizeof(struct in_pktinfo)) + CMSG_SPACE(sizeof(int)) + 1];
180 struct cmsghdr *cmsgptr;
183 struct sockaddr_in from;
184 int flags = 0, ifindex = -1;
186 struct in_pktinfo *inp = NULL;
189 interface_close(iface);
190 uloop_timeout_set(&iface->reconnect, 1000);
194 iov[0].iov_base = buffer;
195 iov[0].iov_len = sizeof(buffer);
197 memset(&msg, 0, sizeof(msg));
198 msg.msg_name = (struct sockaddr *) &from;
199 msg.msg_namelen = sizeof(struct sockaddr_in);
202 msg.msg_control = &cmsg;
203 msg.msg_controllen = sizeof(cmsg);
205 len = recvmsg(u->fd, &msg, flags);
207 perror("read failed");
210 for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL; cmsgptr = CMSG_NXTHDR(&msg, cmsgptr)) {
211 void *c = CMSG_DATA(cmsgptr);
213 switch (cmsgptr->cmsg_type) {
215 inp = ((struct in_pktinfo *) c);
219 ttl = (uint8_t) *((int *) c);
223 fprintf(stderr, "unknown cmsg %x\n", cmsgptr->cmsg_type);
234 fprintf(stderr, "RX ipv4: %s\n", iface->name);
235 fprintf(stderr, " multicast: %d\n", iface->multicast);
236 inet_ntop(AF_INET, &from.sin_addr, buf, 256);
237 fprintf(stderr, " src %s:%d\n", buf, from.sin_port);
238 inet_ntop(AF_INET, &inp->ipi_spec_dst, buf, 256);
239 fprintf(stderr, " dst %s\n", buf);
240 inet_ntop(AF_INET, &inp->ipi_addr, buf, 256);
241 fprintf(stderr, " real %s\n", buf);
244 if (inp->ipi_ifindex != iface->ifindex)
245 fprintf(stderr, "invalid iface index %d != %d\n", ifindex, iface->ifindex);
246 else if (!interface_valid_src((void *) &iface->v4_addr, (void *) &iface->v4_netmask, (void *) &from.sin_addr, 4))
247 dns_handle_packet(iface, (struct sockaddr *) &from, from.sin_port, buffer, len);
251 read_socket6(struct uloop_fd *u, unsigned int events)
253 struct interface *iface = container_of(u, struct interface, fd);
254 static uint8_t buffer[8 * 1024];
256 char cmsg6[CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(sizeof(int)) + 1];
257 struct cmsghdr *cmsgptr;
260 struct sockaddr_in6 from;
261 int flags = 0, ifindex = -1;
263 struct in6_pktinfo *inp = NULL;
266 interface_close(iface);
267 uloop_timeout_set(&iface->reconnect, 1000);
271 iov[0].iov_base = buffer;
272 iov[0].iov_len = sizeof(buffer);
274 memset(&msg, 0, sizeof(msg));
275 msg.msg_name = (struct sockaddr *) &from;
276 msg.msg_namelen = sizeof(struct sockaddr_in6);
279 msg.msg_control = &cmsg6;
280 msg.msg_controllen = sizeof(cmsg6);
282 len = recvmsg(u->fd, &msg, flags);
284 perror("read failed");
287 for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL; cmsgptr = CMSG_NXTHDR(&msg, cmsgptr)) {
288 void *c = CMSG_DATA(cmsgptr);
290 switch (cmsgptr->cmsg_type) {
292 inp = ((struct in6_pktinfo *) c);
296 ttl = (uint8_t) *((int *) c);
300 fprintf(stderr, "unknown cmsg %x\n", cmsgptr->cmsg_type);
311 fprintf(stderr, "RX ipv6: %s\n", iface->name);
312 fprintf(stderr, " multicast: %d\n", iface->multicast);
313 inet_ntop(AF_INET6, &from.sin6_addr, buf, 256);
314 fprintf(stderr, " src %s:%d\n", buf, from.sin6_port);
315 inet_ntop(AF_INET6, &inp->ipi6_addr, buf, 256);
316 fprintf(stderr, " dst %s\n", buf);
319 if (inp->ipi6_ifindex != iface->ifindex)
320 fprintf(stderr, "invalid iface index %d != %d\n", ifindex, iface->ifindex);
321 else if (!interface_valid_src((void *) &iface->v6_addr, (void *) &iface->v6_netmask, (void *) &from.sin6_addr, 16))
322 dns_handle_packet(iface, (struct sockaddr *) &from, from.sin6_port, buffer, len);
326 interface_mcast_setup4(struct interface *iface)
328 struct ip_mreqn mreq;
331 struct sockaddr_in sa = { 0 };
332 int fd = iface->fd.fd;
334 sa.sin_family = AF_INET;
335 sa.sin_port = htons(MCAST_PORT);
336 inet_pton(AF_INET, MCAST_ADDR, &sa.sin_addr);
338 memset(&mreq, 0, sizeof(mreq));
339 mreq.imr_address.s_addr = iface->v4_addr.s_addr;
340 mreq.imr_multiaddr = sa.sin_addr;
341 mreq.imr_ifindex = iface->ifindex;
343 if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0)
344 fprintf(stderr, "ioctl failed: IP_MULTICAST_TTL\n");
346 /* Some network drivers have issues with dropping membership of
347 * mcast groups when the iface is down, but don't allow rejoining
348 * when it comes back up. This is an ugly workaround
349 * -- this was copied from avahi --
351 setsockopt(fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq));
353 if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
354 fprintf(stderr, "failed to join multicast group: %s\n", strerror(errno));
360 if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &no, sizeof(no)) < 0)
361 fprintf(stderr, "ioctl failed: IP_MULTICAST_LOOP\n");
367 interface_socket_setup6(struct interface *iface)
369 struct ipv6_mreq mreq;
372 struct sockaddr_in6 sa = { 0 };
373 int fd = iface->fd.fd;
375 sa.sin6_family = AF_INET6;
376 sa.sin6_port = htons(MCAST_PORT);
377 inet_pton(AF_INET6, MCAST_ADDR6, &sa.sin6_addr);
379 memset(&mreq, 0, sizeof(mreq));
380 mreq.ipv6mr_multiaddr = sa.sin6_addr;
381 mreq.ipv6mr_interface = iface->ifindex;
383 if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) < 0)
384 fprintf(stderr, "ioctl failed: IPV6_MULTICAST_HOPS\n");
386 setsockopt(fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq, sizeof(mreq));
387 if (setsockopt(fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
388 fprintf(stderr, "failed to join multicast group: %s\n", strerror(errno));
394 if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &no, sizeof(no)) < 0)
395 fprintf(stderr, "ioctl failed: IPV6_MULTICAST_LOOP\n");
401 reconnect_socket4(struct uloop_timeout *timeout)
403 struct interface *iface = container_of(timeout, struct interface, reconnect);
407 iface->fd.fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK | USOCK_IPV4ONLY,
408 (iface->multicast) ? (iface->mcast_addr) : (iface->v4_addrs), "5353");
409 if (iface->fd.fd < 0) {
410 fprintf(stderr, "failed to add listener %s: %s\n", iface->mcast_addr, strerror(errno));
414 if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_BINDTODEVICE, iface->name, strlen(iface->name) < 0))
415 fprintf(stderr, "ioctl failed: SO_BINDTODEVICE\n");
417 if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0)
418 fprintf(stderr, "ioctl failed: SO_REUSEADDR\n");
420 if (setsockopt(iface->fd.fd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)) < 0)
421 fprintf(stderr, "ioctl failed: IP_TTL\n");
423 if (setsockopt(iface->fd.fd, IPPROTO_IP, IP_RECVTTL, &yes, sizeof(yes)) < 0)
424 fprintf(stderr, "ioctl failed: IP_RECVTTL\n");
426 if (setsockopt(iface->fd.fd, IPPROTO_IP, IP_PKTINFO, &yes, sizeof(yes)) < 0)
427 fprintf(stderr, "ioctl failed: IP_PKTINFO\n");
429 if (iface->multicast && interface_mcast_setup4(iface)) {
434 uloop_fd_add(&iface->fd, ULOOP_READ);
435 if (iface->multicast) {
436 dns_send_question(iface, "_services._dns-sd._udp.local", TYPE_PTR, 0);
437 announce_init(iface);
443 uloop_timeout_set(timeout, 1000);
447 reconnect_socket6(struct uloop_timeout *timeout)
449 struct interface *iface = container_of(timeout, struct interface, reconnect);
450 char mcast_addr[128];
454 snprintf(mcast_addr, sizeof(mcast_addr), "%s%%%s", (iface->multicast) ? (iface->mcast_addr) : (iface->v6_addrs), iface->name);
455 iface->fd.fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK | USOCK_IPV6ONLY, mcast_addr, "5353");
456 if (iface->fd.fd < 0) {
457 fprintf(stderr, "failed to add listener %s: %s\n", mcast_addr, strerror(errno));
461 if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_BINDTODEVICE, iface->name, strlen(iface->name) < 0))
462 fprintf(stderr, "ioctl failed: SO_BINDTODEVICE\n");
464 if (setsockopt(iface->fd.fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)) < 0)
465 fprintf(stderr, "ioctl failed: IPV6_UNICAST_HOPS\n");
467 if (setsockopt(iface->fd.fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &yes, sizeof(yes)) < 0)
468 fprintf(stderr, "ioctl failed: IPV6_RECVPKTINFO\n");
470 if (setsockopt(iface->fd.fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &yes, sizeof(yes)) < 0)
471 fprintf(stderr, "ioctl failed: IPV6_RECVHOPLIMIT\n");
473 if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0)
474 fprintf(stderr, "ioctl failed: SO_REUSEADDR\n");
476 if (iface->multicast && interface_socket_setup6(iface)) {
481 uloop_fd_add(&iface->fd, ULOOP_READ);
483 if (iface->multicast) {
484 dns_send_question(iface, "_services._dns-sd._udp.local", TYPE_PTR, 0);
485 announce_init(iface);
491 uloop_timeout_set(timeout, 1000);
495 static void interface_start(struct interface *iface)
498 iface->fd.cb = read_socket6;
499 iface->reconnect.cb = reconnect_socket6;
501 iface->fd.cb = read_socket4;
502 iface->reconnect.cb = reconnect_socket4;
504 uloop_timeout_set(&iface->reconnect, 100);
508 iface_update_cb(struct vlist_tree *tree, struct vlist_node *node_new,
509 struct vlist_node *node_old)
511 struct interface *iface;
514 iface = container_of(node_old, struct interface, node);
515 interface_free(iface);
519 iface = container_of(node_new, struct interface, node);
520 interface_start(iface);
524 static struct interface* _interface_add(const char *name, int multicast, int v6)
526 struct interface *iface;
530 iface = calloc_a(sizeof(*iface),
531 &name_buf, strlen(name) + 1,
532 &id_buf, strlen(name) + 5);
534 sprintf(id_buf, "%d_%d_%s", multicast, v6, name);
535 iface->name = strcpy(name_buf, name);
537 iface->ifindex = if_nametoindex(name);
539 iface->multicast = multicast;
542 iface->mcast_addr = MCAST_ADDR6;
544 iface->mcast_addr = MCAST_ADDR;
546 if (iface->ifindex <= 0)
549 vlist_add(&interfaces, &iface->node, iface->id);
557 int interface_add(const char *name)
559 struct interface *v4 = NULL, *v6 = NULL, *unicast;
560 struct ifaddrs *ifap, *ifa;
564 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
565 if (strcmp(ifa->ifa_name, name))
567 if (ifa->ifa_addr->sa_family == AF_INET && !v4) {
568 struct sockaddr_in *sa;
570 if (cfg_proto && (cfg_proto != 4))
573 unicast = _interface_add(name, 0, 0);
576 v4 = _interface_add(name, 1, 0);
580 sa = (struct sockaddr_in *) ifa->ifa_addr;
581 memcpy(&v4->v4_addr, &sa->sin_addr, sizeof(v4->v4_addr));
582 memcpy(&unicast->v4_addr, &sa->sin_addr, sizeof(unicast->v4_addr));
584 inet_ntop(AF_INET, &sa->sin_addr, v4->v4_addrs, sizeof(v4->v4_addrs));
585 inet_ntop(AF_INET, &sa->sin_addr, unicast->v4_addrs, sizeof(unicast->v4_addrs));
587 sa = (struct sockaddr_in *) ifa->ifa_netmask;
588 memcpy(&unicast->v4_netmask, &sa->sin_addr, sizeof(unicast->v4_netmask));
589 memcpy(&v4->v4_netmask, &sa->sin_addr, sizeof(v4->v4_netmask));
595 if (ifa->ifa_addr->sa_family == AF_INET6 && !v6) {
596 uint8_t ll_prefix[] = {0xfe, 0x80 };
597 struct sockaddr_in6 *sa6;
599 if (cfg_proto && (cfg_proto != 6))
602 sa6 = (struct sockaddr_in6 *) ifa->ifa_addr;
603 if (memcmp(&sa6->sin6_addr, &ll_prefix, 2))
606 unicast = _interface_add(name, 0, 1);
609 v6 = _interface_add(name, 1, 1);
613 memcpy(&v6->v6_addr, &sa6->sin6_addr, sizeof(v6->v6_addr));
614 memcpy(&unicast->v6_addr, &sa6->sin6_addr, sizeof(unicast->v6_addr));
616 inet_ntop(AF_INET6, &sa6->sin6_addr, v6->v6_addrs, sizeof(v6->v6_addrs));
617 inet_ntop(AF_INET6, &sa6->sin6_addr, unicast->v6_addrs, sizeof(unicast->v6_addrs));
619 sa6 = (struct sockaddr_in6 *) ifa->ifa_netmask;
620 memcpy(&v6->v6_netmask, &sa6->sin6_addr, sizeof(v6->v6_netmask));
621 memcpy(&unicast->v6_netmask, &sa6->sin6_addr, sizeof(unicast->v6_netmask));
633 void interface_shutdown(void)
635 struct interface *iface;
637 vlist_for_each_element(&interfaces, iface, node)
638 if (iface->fd.fd > 0 && iface->multicast) {
639 dns_reply_a(iface, NULL, 0);
640 service_announce_services(iface, 0);
642 vlist_for_each_element(&interfaces, iface, node)
643 interface_close(iface);
647 interface_get(const char *name, int v6, int multicast)
650 snprintf(id_buf, sizeof(id_buf), "%d_%d_%s", multicast, v6, name);
651 struct interface *iface = vlist_find(&interfaces, id_buf, iface, node);
655 VLIST_TREE(interfaces, avl_strcmp, iface_update_cb, false, false);