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->v6_addr, (void *) &iface->v6_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, 0);
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, 0);
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 dns_reply_a(iface, 0);
624 service_announce_services(iface, 0);
626 vlist_for_each_element(&interfaces, iface, node)
627 interface_close(iface);
631 interface_get(const char *name, int v6, int multicast)
634 snprintf(id_buf, sizeof(id_buf), "%d_%d_%s", multicast, v6, name);
635 struct interface *iface = vlist_find(&interfaces, id_buf, iface, node);
639 VLIST_TREE(interfaces, avl_strcmp, iface_update_cb, false, false);