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>
38 #include "interface.h"
45 interface_send_packet4(struct interface *iface, struct sockaddr_in *to, struct iovec *iov, int iov_len)
47 static size_t cmsg_data[( CMSG_SPACE(sizeof(struct in_pktinfo)) / sizeof(size_t)) + 1];
48 static struct sockaddr_in a;
49 static struct msghdr m = {
50 .msg_name = (struct sockaddr *) &a,
51 .msg_namelen = sizeof(a),
52 .msg_control = cmsg_data,
53 .msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)),
55 struct in_pktinfo *pkti;
57 int fd = iface->fd.fd;
59 a.sin_family = AF_INET;
60 a.sin_port = htons(MCAST_PORT);
62 m.msg_iovlen = iov_len;
64 memset(cmsg_data, 0, sizeof(cmsg_data));
65 cmsg = CMSG_FIRSTHDR(&m);
66 cmsg->cmsg_len = m.msg_controllen;
67 cmsg->cmsg_level = IPPROTO_IP;
68 cmsg->cmsg_type = IP_PKTINFO;
70 pkti = (struct in_pktinfo*) CMSG_DATA(cmsg);
71 pkti->ipi_ifindex = iface->ifindex;
73 if (iface->multicast) {
74 a.sin_addr.s_addr = inet_addr(MCAST_ADDR);
76 fprintf(stderr, "Ignoring IPv4 address for multicast interface\n");
78 a.sin_addr.s_addr = to->sin_addr.s_addr;
81 return sendmsg(fd, &m, 0);
85 interface_send_packet6(struct interface *iface, struct sockaddr_in6 *to, struct iovec *iov, int iov_len)
87 static size_t cmsg_data[( CMSG_SPACE(sizeof(struct in6_pktinfo)) / sizeof(size_t)) + 1];
88 static struct sockaddr_in6 a;
89 static struct msghdr m = {
90 .msg_name = (struct sockaddr *) &a,
91 .msg_namelen = sizeof(a),
92 .msg_control = cmsg_data,
93 .msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)),
95 struct in6_pktinfo *pkti;
97 int fd = iface->fd.fd;
99 a.sin6_family = AF_INET6;
100 a.sin6_port = htons(MCAST_PORT);
102 m.msg_iovlen = iov_len;
104 memset(cmsg_data, 0, sizeof(cmsg_data));
105 cmsg = CMSG_FIRSTHDR(&m);
106 cmsg->cmsg_len = m.msg_controllen;
107 cmsg->cmsg_level = IPPROTO_IPV6;
108 cmsg->cmsg_type = IPV6_PKTINFO;
110 pkti = (struct in6_pktinfo*) CMSG_DATA(cmsg);
111 pkti->ipi6_ifindex = iface->ifindex;
113 if (iface->multicast) {
114 inet_pton(AF_INET6, MCAST_ADDR6, &a.sin6_addr);
116 fprintf(stderr, "Ignoring IPv6 address for multicast interface\n");
118 a.sin6_addr = to->sin6_addr;
121 return sendmsg(fd, &m, 0);
125 interface_send_packet(struct interface *iface, struct sockaddr *to, struct iovec *iov, int iov_len)
127 if (!iface->multicast && !to) {
128 fprintf(stderr, "No IP address specified for unicast interface\n");
134 fprintf(stderr, "TX ipv%d: %s\n", iface->v6 * 2 + 4, iface->name);
135 fprintf(stderr, " multicast: %d\n", iface->multicast);
139 return interface_send_packet6(iface, (struct sockaddr_in6 *)to, iov, iov_len);
141 return interface_send_packet4(iface, (struct sockaddr_in *)to, iov, iov_len);
144 static void interface_close(struct interface *iface)
146 if (iface->fd.fd < 0)
149 announce_free(iface);
150 uloop_fd_delete(&iface->fd);
155 static void interface_free(struct interface *iface)
157 uloop_timeout_cancel(&iface->reconnect);
158 interface_close(iface);
163 interface_valid_src(void *ip1, void *mask, void *ip2, int len)
173 for (i = 0; i < len; i++, i1++, i2++, m++) {
174 if ((*i1 & *m) != (*i2 & *m))
182 read_socket4(struct uloop_fd *u, unsigned int events)
184 struct interface *iface = container_of(u, struct interface, fd);
185 static uint8_t buffer[8 * 1024];
187 char cmsg[CMSG_SPACE(sizeof(struct in_pktinfo)) + CMSG_SPACE(sizeof(int)) + 1];
188 struct cmsghdr *cmsgptr;
191 struct sockaddr_in from;
192 int flags = 0, ifindex = -1;
194 struct in_pktinfo *inp = NULL;
197 interface_close(iface);
198 uloop_timeout_set(&iface->reconnect, 1000);
202 iov[0].iov_base = buffer;
203 iov[0].iov_len = sizeof(buffer);
205 memset(&msg, 0, sizeof(msg));
206 msg.msg_name = (struct sockaddr *) &from;
207 msg.msg_namelen = sizeof(struct sockaddr_in);
210 msg.msg_control = &cmsg;
211 msg.msg_controllen = sizeof(cmsg);
213 len = recvmsg(u->fd, &msg, flags);
215 perror("read failed");
218 for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL; cmsgptr = CMSG_NXTHDR(&msg, cmsgptr)) {
219 void *c = CMSG_DATA(cmsgptr);
221 switch (cmsgptr->cmsg_type) {
223 inp = ((struct in_pktinfo *) c);
227 ttl = (uint8_t) *((int *) c);
231 fprintf(stderr, "unknown cmsg %x\n", cmsgptr->cmsg_type);
242 fprintf(stderr, "RX ipv4: %s\n", iface->name);
243 fprintf(stderr, " multicast: %d\n", iface->multicast);
244 inet_ntop(AF_INET, &from.sin_addr, buf, 256);
245 fprintf(stderr, " src %s:%d\n", buf, ntohs(from.sin_port));
246 inet_ntop(AF_INET, &inp->ipi_spec_dst, buf, 256);
247 fprintf(stderr, " dst %s\n", buf);
248 inet_ntop(AF_INET, &inp->ipi_addr, buf, 256);
249 fprintf(stderr, " real %s\n", buf);
252 if (inp->ipi_ifindex != iface->ifindex)
253 fprintf(stderr, "invalid iface index %d != %d\n", ifindex, iface->ifindex);
254 else if (!interface_valid_src((void *) &iface->v4_addr, (void *) &iface->v4_netmask, (void *) &from.sin_addr, 4))
255 dns_handle_packet(iface, (struct sockaddr *) &from, ntohs(from.sin_port), buffer, len);
259 read_socket6(struct uloop_fd *u, unsigned int events)
261 struct interface *iface = container_of(u, struct interface, fd);
262 static uint8_t buffer[8 * 1024];
264 char cmsg6[CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(sizeof(int)) + 1];
265 struct cmsghdr *cmsgptr;
268 struct sockaddr_in6 from;
269 int flags = 0, ifindex = -1;
271 struct in6_pktinfo *inp = NULL;
274 interface_close(iface);
275 uloop_timeout_set(&iface->reconnect, 1000);
279 iov[0].iov_base = buffer;
280 iov[0].iov_len = sizeof(buffer);
282 memset(&msg, 0, sizeof(msg));
283 msg.msg_name = (struct sockaddr *) &from;
284 msg.msg_namelen = sizeof(struct sockaddr_in6);
287 msg.msg_control = &cmsg6;
288 msg.msg_controllen = sizeof(cmsg6);
290 len = recvmsg(u->fd, &msg, flags);
292 perror("read failed");
295 for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL; cmsgptr = CMSG_NXTHDR(&msg, cmsgptr)) {
296 void *c = CMSG_DATA(cmsgptr);
298 switch (cmsgptr->cmsg_type) {
300 inp = ((struct in6_pktinfo *) c);
304 ttl = (uint8_t) *((int *) c);
308 fprintf(stderr, "unknown cmsg %x\n", cmsgptr->cmsg_type);
319 fprintf(stderr, "RX ipv6: %s\n", iface->name);
320 fprintf(stderr, " multicast: %d\n", iface->multicast);
321 inet_ntop(AF_INET6, &from.sin6_addr, buf, 256);
322 fprintf(stderr, " src %s:%d\n", buf, ntohs(from.sin6_port));
323 inet_ntop(AF_INET6, &inp->ipi6_addr, buf, 256);
324 fprintf(stderr, " dst %s\n", buf);
327 if (inp->ipi6_ifindex != iface->ifindex)
328 fprintf(stderr, "invalid iface index %d != %d\n", ifindex, iface->ifindex);
329 else if (!interface_valid_src((void *) &iface->v6_addr, (void *) &iface->v6_netmask, (void *) &from.sin6_addr, 16))
330 dns_handle_packet(iface, (struct sockaddr *) &from, ntohs(from.sin6_port), buffer, len);
334 interface_mcast_setup4(struct interface *iface)
336 struct ip_mreqn mreq;
339 struct sockaddr_in sa = { 0 };
340 int fd = iface->fd.fd;
342 sa.sin_family = AF_INET;
343 sa.sin_port = htons(MCAST_PORT);
344 inet_pton(AF_INET, MCAST_ADDR, &sa.sin_addr);
346 memset(&mreq, 0, sizeof(mreq));
347 mreq.imr_address.s_addr = iface->v4_addr.s_addr;
348 mreq.imr_multiaddr = sa.sin_addr;
349 mreq.imr_ifindex = iface->ifindex;
351 if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0)
352 fprintf(stderr, "ioctl failed: IP_MULTICAST_TTL\n");
354 /* Some network drivers have issues with dropping membership of
355 * mcast groups when the iface is down, but don't allow rejoining
356 * when it comes back up. This is an ugly workaround
357 * -- this was copied from avahi --
359 setsockopt(fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq));
361 if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
362 fprintf(stderr, "failed to join multicast group: %s\n", strerror(errno));
368 if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &no, sizeof(no)) < 0)
369 fprintf(stderr, "ioctl failed: IP_MULTICAST_LOOP\n");
375 interface_socket_setup6(struct interface *iface)
377 struct ipv6_mreq mreq;
380 struct sockaddr_in6 sa = { 0 };
381 int fd = iface->fd.fd;
383 sa.sin6_family = AF_INET6;
384 sa.sin6_port = htons(MCAST_PORT);
385 inet_pton(AF_INET6, MCAST_ADDR6, &sa.sin6_addr);
387 memset(&mreq, 0, sizeof(mreq));
388 mreq.ipv6mr_multiaddr = sa.sin6_addr;
389 mreq.ipv6mr_interface = iface->ifindex;
391 if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) < 0)
392 fprintf(stderr, "ioctl failed: IPV6_MULTICAST_HOPS\n");
394 setsockopt(fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq, sizeof(mreq));
395 if (setsockopt(fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
396 fprintf(stderr, "failed to join multicast group: %s\n", strerror(errno));
402 if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &no, sizeof(no)) < 0)
403 fprintf(stderr, "ioctl failed: IPV6_MULTICAST_LOOP\n");
409 reconnect_socket4(struct uloop_timeout *timeout)
411 struct interface *iface = container_of(timeout, struct interface, reconnect);
415 iface->fd.fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK | USOCK_IPV4ONLY,
416 (iface->multicast) ? (iface->mcast_addr) : (iface->v4_addrs), "5353");
417 if (iface->fd.fd < 0) {
418 fprintf(stderr, "failed to add listener %s: %s\n", iface->mcast_addr, strerror(errno));
422 if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_BINDTODEVICE, iface->name, strlen(iface->name) < 0))
423 fprintf(stderr, "ioctl failed: SO_BINDTODEVICE\n");
425 if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0)
426 fprintf(stderr, "ioctl failed: SO_REUSEADDR\n");
428 if (setsockopt(iface->fd.fd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)) < 0)
429 fprintf(stderr, "ioctl failed: IP_TTL\n");
431 if (setsockopt(iface->fd.fd, IPPROTO_IP, IP_RECVTTL, &yes, sizeof(yes)) < 0)
432 fprintf(stderr, "ioctl failed: IP_RECVTTL\n");
434 if (setsockopt(iface->fd.fd, IPPROTO_IP, IP_PKTINFO, &yes, sizeof(yes)) < 0)
435 fprintf(stderr, "ioctl failed: IP_PKTINFO\n");
437 if (iface->multicast && interface_mcast_setup4(iface)) {
442 uloop_fd_add(&iface->fd, ULOOP_READ);
443 if (iface->multicast) {
444 dns_send_question(iface, C_DNS_SD, TYPE_PTR, 0);
445 announce_init(iface);
451 uloop_timeout_set(timeout, 1000);
455 reconnect_socket6(struct uloop_timeout *timeout)
457 struct interface *iface = container_of(timeout, struct interface, reconnect);
458 char mcast_addr[128];
462 snprintf(mcast_addr, sizeof(mcast_addr), "%s%%%s", (iface->multicast) ? (iface->mcast_addr) : (iface->v6_addrs), iface->name);
463 iface->fd.fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK | USOCK_IPV6ONLY, mcast_addr, "5353");
464 if (iface->fd.fd < 0) {
465 fprintf(stderr, "failed to add listener %s: %s\n", mcast_addr, strerror(errno));
469 if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_BINDTODEVICE, iface->name, strlen(iface->name) < 0))
470 fprintf(stderr, "ioctl failed: SO_BINDTODEVICE\n");
472 if (setsockopt(iface->fd.fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)) < 0)
473 fprintf(stderr, "ioctl failed: IPV6_UNICAST_HOPS\n");
475 if (setsockopt(iface->fd.fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &yes, sizeof(yes)) < 0)
476 fprintf(stderr, "ioctl failed: IPV6_RECVPKTINFO\n");
478 if (setsockopt(iface->fd.fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &yes, sizeof(yes)) < 0)
479 fprintf(stderr, "ioctl failed: IPV6_RECVHOPLIMIT\n");
481 if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0)
482 fprintf(stderr, "ioctl failed: SO_REUSEADDR\n");
484 if (iface->multicast && interface_socket_setup6(iface)) {
489 uloop_fd_add(&iface->fd, ULOOP_READ);
491 if (iface->multicast) {
492 dns_send_question(iface, C_DNS_SD, TYPE_PTR, 0);
493 announce_init(iface);
499 uloop_timeout_set(timeout, 1000);
503 static void interface_start(struct interface *iface)
506 iface->fd.cb = read_socket6;
507 iface->reconnect.cb = reconnect_socket6;
509 iface->fd.cb = read_socket4;
510 iface->reconnect.cb = reconnect_socket4;
512 uloop_timeout_set(&iface->reconnect, 100);
516 iface_update_cb(struct vlist_tree *tree, struct vlist_node *node_new,
517 struct vlist_node *node_old)
519 struct interface *iface;
522 iface = container_of(node_old, struct interface, node);
523 cache_cleanup(iface);
524 interface_free(iface);
528 iface = container_of(node_new, struct interface, node);
529 interface_start(iface);
533 static struct interface* _interface_add(const char *name, int multicast, int v6)
535 struct interface *iface;
539 iface = calloc_a(sizeof(*iface),
540 &name_buf, strlen(name) + 1,
541 &id_buf, strlen(name) + 5);
543 sprintf(id_buf, "%d_%d_%s", multicast, v6, name);
544 iface->name = strcpy(name_buf, name);
546 iface->ifindex = if_nametoindex(name);
548 iface->multicast = multicast;
551 iface->mcast_addr = MCAST_ADDR6;
553 iface->mcast_addr = MCAST_ADDR;
555 if (iface->ifindex <= 0)
558 vlist_add(&interfaces, &iface->node, iface->id);
566 int interface_add(const char *name)
568 struct interface *v4 = NULL, *v6 = NULL, *unicast;
569 struct ifaddrs *ifap, *ifa;
573 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
574 if (strcmp(ifa->ifa_name, name))
576 if (ifa->ifa_addr->sa_family == AF_INET && !v4) {
577 struct sockaddr_in *sa;
579 if (cfg_proto && (cfg_proto != 4))
582 unicast = _interface_add(name, 0, 0);
585 v4 = _interface_add(name, 1, 0);
589 sa = (struct sockaddr_in *) ifa->ifa_addr;
590 memcpy(&v4->v4_addr, &sa->sin_addr, sizeof(v4->v4_addr));
591 memcpy(&unicast->v4_addr, &sa->sin_addr, sizeof(unicast->v4_addr));
593 inet_ntop(AF_INET, &sa->sin_addr, v4->v4_addrs, sizeof(v4->v4_addrs));
594 inet_ntop(AF_INET, &sa->sin_addr, unicast->v4_addrs, sizeof(unicast->v4_addrs));
596 sa = (struct sockaddr_in *) ifa->ifa_netmask;
597 memcpy(&unicast->v4_netmask, &sa->sin_addr, sizeof(unicast->v4_netmask));
598 memcpy(&v4->v4_netmask, &sa->sin_addr, sizeof(v4->v4_netmask));
604 if (ifa->ifa_addr->sa_family == AF_INET6 && !v6) {
605 uint8_t ll_prefix[] = {0xfe, 0x80 };
606 struct sockaddr_in6 *sa6;
608 if (cfg_proto && (cfg_proto != 6))
611 sa6 = (struct sockaddr_in6 *) ifa->ifa_addr;
612 if (memcmp(&sa6->sin6_addr, &ll_prefix, 2))
615 unicast = _interface_add(name, 0, 1);
618 v6 = _interface_add(name, 1, 1);
622 memcpy(&v6->v6_addr, &sa6->sin6_addr, sizeof(v6->v6_addr));
623 memcpy(&unicast->v6_addr, &sa6->sin6_addr, sizeof(unicast->v6_addr));
625 inet_ntop(AF_INET6, &sa6->sin6_addr, v6->v6_addrs, sizeof(v6->v6_addrs));
626 inet_ntop(AF_INET6, &sa6->sin6_addr, unicast->v6_addrs, sizeof(unicast->v6_addrs));
628 sa6 = (struct sockaddr_in6 *) ifa->ifa_netmask;
629 memcpy(&v6->v6_netmask, &sa6->sin6_addr, sizeof(v6->v6_netmask));
630 memcpy(&unicast->v6_netmask, &sa6->sin6_addr, sizeof(unicast->v6_netmask));
642 void interface_shutdown(void)
644 struct interface *iface;
646 vlist_for_each_element(&interfaces, iface, node)
647 if (iface->fd.fd > 0 && iface->multicast) {
648 dns_reply_a(iface, NULL, 0);
649 service_announce_services(iface, NULL, 0);
651 vlist_for_each_element(&interfaces, iface, node)
652 interface_close(iface);
656 interface_get(const char *name, int v6, int multicast)
659 snprintf(id_buf, sizeof(id_buf), "%d_%d_%s", multicast, v6, name);
660 struct interface *iface = vlist_find(&interfaces, id_buf, iface, node);
664 VLIST_TREE(interfaces, avl_strcmp, iface_update_cb, false, false);