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 fprintf(stderr, "TX ipv%d: %s\n", iface->v6 * 2 + 4, iface->name);
115 fprintf(stderr, " multicast: %d\n", iface->multicast);
119 return interface_send_packet6(iface, iov, iov_len);
121 return interface_send_packet4(iface, iov, iov_len);
124 static void interface_close(struct interface *iface)
126 if (iface->fd.fd < 0)
129 announce_free(iface);
130 uloop_fd_delete(&iface->fd);
135 static void interface_free(struct interface *iface)
137 interface_close(iface);
142 read_socket4(struct uloop_fd *u, unsigned int events)
144 struct interface *iface = container_of(u, struct interface, fd);
145 static uint8_t buffer[8 * 1024];
147 char cmsg[CMSG_SPACE(sizeof(struct in_pktinfo)) + CMSG_SPACE(sizeof(int)) + 1];
148 struct cmsghdr *cmsgptr;
151 struct sockaddr_in from;
152 int flags = 0, ifindex = -1;
154 struct in_pktinfo *inp = NULL;
157 interface_close(iface);
158 uloop_timeout_set(&iface->reconnect, 1000);
162 iov[0].iov_base = buffer;
163 iov[0].iov_len = sizeof(buffer);
165 memset(&msg, 0, sizeof(msg));
166 msg.msg_name = (struct sockaddr *) &from;
167 msg.msg_namelen = sizeof(struct sockaddr_in);
170 msg.msg_control = &cmsg;
171 msg.msg_controllen = sizeof(cmsg);
173 len = recvmsg(u->fd, &msg, flags);
175 perror("read failed");
178 for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL; cmsgptr = CMSG_NXTHDR(&msg, cmsgptr)) {
179 void *c = CMSG_DATA(cmsgptr);
181 switch (cmsgptr->cmsg_type) {
183 inp = ((struct in_pktinfo *) c);
187 ttl = (uint8_t) *((int *) c);
191 fprintf(stderr, "unknown cmsg %x\n", cmsgptr->cmsg_type);
202 fprintf(stderr, "RX ipv4: %s\n", iface->name);
203 fprintf(stderr, " multicast: %d\n", iface->multicast);
204 inet_ntop(AF_INET, &from.sin_addr, buf, 256);
205 fprintf(stderr, " src %s:%d\n", buf, from.sin_port);
206 inet_ntop(AF_INET, &inp->ipi_spec_dst, buf, 256);
207 fprintf(stderr, " dst %s\n", buf);
208 inet_ntop(AF_INET, &inp->ipi_addr, buf, 256);
209 fprintf(stderr, " real %s\n", buf);
212 if (inp->ipi_ifindex != iface->ifindex)
213 fprintf(stderr, "invalid iface index %d != %d\n", ifindex, iface->ifindex);
215 dns_handle_packet(iface, buffer, len, 0);
219 read_socket6(struct uloop_fd *u, unsigned int events)
221 struct interface *iface = container_of(u, struct interface, fd);
222 static uint8_t buffer[8 * 1024];
224 char cmsg6[CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(sizeof(int)) + 1];
225 struct cmsghdr *cmsgptr;
228 struct sockaddr_in6 from;
229 int flags = 0, ifindex = -1;
231 struct in6_pktinfo *inp = NULL;
234 interface_close(iface);
235 uloop_timeout_set(&iface->reconnect, 1000);
239 iov[0].iov_base = buffer;
240 iov[0].iov_len = sizeof(buffer);
242 memset(&msg, 0, sizeof(msg));
243 msg.msg_name = (struct sockaddr *) &from;
244 msg.msg_namelen = sizeof(struct sockaddr_in6);
247 msg.msg_control = &cmsg6;
248 msg.msg_controllen = sizeof(cmsg6);
250 len = recvmsg(u->fd, &msg, flags);
252 perror("read failed");
255 for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL; cmsgptr = CMSG_NXTHDR(&msg, cmsgptr)) {
256 void *c = CMSG_DATA(cmsgptr);
258 switch (cmsgptr->cmsg_type) {
260 inp = ((struct in6_pktinfo *) c);
264 ttl = (uint8_t) *((int *) c);
268 fprintf(stderr, "unknown cmsg %x\n", cmsgptr->cmsg_type);
279 fprintf(stderr, "RX ipv6: %s\n", iface->name);
280 fprintf(stderr, " multicast: %d\n", iface->multicast);
281 inet_ntop(AF_INET6, &from.sin6_addr, buf, 256);
282 fprintf(stderr, " src %s:%d\n", buf, from.sin6_port);
283 inet_ntop(AF_INET6, &inp->ipi6_addr, buf, 256);
284 fprintf(stderr, " dst %s\n", buf);
287 if (inp->ipi6_ifindex != iface->ifindex)
288 fprintf(stderr, "invalid iface index %d != %d\n", ifindex, iface->ifindex);
290 dns_handle_packet(iface, buffer, len, 0);
294 interface_mcast_setup4(struct interface *iface)
296 struct ip_mreqn mreq;
299 struct sockaddr_in sa = { 0 };
300 int fd = iface->fd.fd;
302 sa.sin_family = AF_INET;
303 sa.sin_port = htons(MCAST_PORT);
304 inet_pton(AF_INET, MCAST_ADDR, &sa.sin_addr);
306 memset(&mreq, 0, sizeof(mreq));
307 mreq.imr_address.s_addr = iface->v4_addr.s_addr;
308 mreq.imr_multiaddr = sa.sin_addr;
309 mreq.imr_ifindex = iface->ifindex;
311 if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0)
312 fprintf(stderr, "ioctl failed: IP_MULTICAST_TTL\n");
314 /* Some network drivers have issues with dropping membership of
315 * mcast groups when the iface is down, but don't allow rejoining
316 * when it comes back up. This is an ugly workaround
317 * -- this was copied from avahi --
319 setsockopt(fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq));
321 if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
322 fprintf(stderr, "failed to join multicast group: %s\n", strerror(errno));
328 if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &no, sizeof(no)) < 0)
329 fprintf(stderr, "ioctl failed: IP_MULTICAST_LOOP\n");
335 interface_socket_setup6(struct interface *iface)
337 struct ipv6_mreq mreq;
340 struct sockaddr_in6 sa = { 0 };
341 int fd = iface->fd.fd;
343 sa.sin6_family = AF_INET6;
344 sa.sin6_port = htons(MCAST_PORT);
345 inet_pton(AF_INET6, MCAST_ADDR6, &sa.sin6_addr);
347 memset(&mreq, 0, sizeof(mreq));
348 mreq.ipv6mr_multiaddr = sa.sin6_addr;
349 mreq.ipv6mr_interface = iface->ifindex;
351 if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) < 0)
352 fprintf(stderr, "ioctl failed: IPV6_MULTICAST_HOPS\n");
354 setsockopt(fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq, sizeof(mreq));
355 if (setsockopt(fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
356 fprintf(stderr, "failed to join multicast group: %s\n", strerror(errno));
362 if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &no, sizeof(no)) < 0)
363 fprintf(stderr, "ioctl failed: IPV6_MULTICAST_LOOP\n");
369 reconnect_socket4(struct uloop_timeout *timeout)
371 struct interface *iface = container_of(timeout, struct interface, reconnect);
374 iface->fd.fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK | USOCK_IPV4ONLY,
375 (iface->multicast) ? (iface->mcast_addr) : (iface->v4_addrs), "5353");
376 if (iface->fd.fd < 0) {
377 fprintf(stderr, "failed to add listener %s: %s\n", iface->mcast_addr, strerror(errno));
381 if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_BINDTODEVICE, iface->name, strlen(iface->name) < 0))
382 fprintf(stderr, "ioctl failed: SO_BINDTODEVICE\n");
384 if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0)
385 fprintf(stderr, "ioctl failed: SO_REUSEADDR\n");
387 if (setsockopt(iface->fd.fd, IPPROTO_IP, IP_RECVTTL, &yes, sizeof(yes)) < 0)
388 fprintf(stderr, "ioctl failed: IP_RECVTTL\n");
390 if (setsockopt(iface->fd.fd, IPPROTO_IP, IP_PKTINFO, &yes, sizeof(yes)) < 0)
391 fprintf(stderr, "ioctl failed: IP_PKTINFO\n");
393 if (iface->multicast && interface_mcast_setup4(iface)) {
398 uloop_fd_add(&iface->fd, ULOOP_READ);
399 if (iface->multicast) {
400 dns_send_question(iface, "_services._dns-sd._udp.local", TYPE_PTR, 1);
401 announce_init(iface);
407 uloop_timeout_set(timeout, 1000);
411 reconnect_socket6(struct uloop_timeout *timeout)
413 struct interface *iface = container_of(timeout, struct interface, reconnect);
414 char mcast_addr[128];
418 snprintf(mcast_addr, sizeof(mcast_addr), "%s%%%s", (iface->multicast) ? (iface->mcast_addr) : (iface->v6_addrs), iface->name);
419 iface->fd.fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK | USOCK_IPV6ONLY, mcast_addr, "5353");
420 if (iface->fd.fd < 0) {
421 fprintf(stderr, "failed to add listener %s: %s\n", mcast_addr, strerror(errno));
425 if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_BINDTODEVICE, iface->name, strlen(iface->name) < 0))
426 fprintf(stderr, "ioctl failed: SO_BINDTODEVICE\n");
428 if (setsockopt(iface->fd.fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)) < 0)
429 fprintf(stderr, "ioctl failed: IPV6_UNICAST_HOPS\n");
431 if (setsockopt(iface->fd.fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &yes, sizeof(yes)) < 0)
432 fprintf(stderr, "ioctl failed: IPV6_RECVPKTINFO\n");
434 if (setsockopt(iface->fd.fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &yes, sizeof(yes)) < 0)
435 fprintf(stderr, "ioctl failed: IPV6_RECVHOPLIMIT\n");
437 if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0)
438 fprintf(stderr, "ioctl failed: SO_REUSEADDR\n");
440 if (iface->multicast && interface_socket_setup6(iface)) {
445 uloop_fd_add(&iface->fd, ULOOP_READ);
447 if (iface->multicast) {
448 dns_send_question(iface, "_services._dns-sd._udp.local", TYPE_PTR, 1);
449 announce_init(iface);
455 uloop_timeout_set(timeout, 1000);
459 static void interface_start(struct interface *iface)
462 iface->fd.cb = read_socket6;
463 iface->reconnect.cb = reconnect_socket6;
465 iface->fd.cb = read_socket4;
466 iface->reconnect.cb = reconnect_socket4;
468 uloop_timeout_set(&iface->reconnect, 100);
472 iface_update_cb(struct vlist_tree *tree, struct vlist_node *node_new,
473 struct vlist_node *node_old)
475 struct interface *iface;
478 iface = container_of(node_old, struct interface, node);
479 interface_free(iface);
483 iface = container_of(node_new, struct interface, node);
484 interface_start(iface);
488 static struct interface* _interface_add(const char *name, int multicast, int v6)
490 struct interface *iface;
494 iface = calloc_a(sizeof(*iface),
495 &name_buf, strlen(name) + 1,
496 &id_buf, strlen(name) + 5);
498 sprintf(id_buf, "%d_%d_%s", multicast, v6, name);
499 iface->name = strcpy(name_buf, name);
501 iface->ifindex = if_nametoindex(name);
503 iface->multicast = multicast;
506 iface->mcast_addr = MCAST_ADDR6;
508 iface->mcast_addr = MCAST_ADDR;
510 if (iface->ifindex <= 0)
513 vlist_add(&interfaces, &iface->node, iface->id);
521 int interface_add(const char *name)
523 struct interface *v4 = NULL, *v6 = NULL, *unicast;
524 struct ifaddrs *ifap, *ifa;
528 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
529 if (strcmp(ifa->ifa_name, name))
531 if (ifa->ifa_addr->sa_family == AF_INET && !v4) {
532 struct sockaddr_in *sa;
534 if (cfg_proto && (cfg_proto != 4))
537 unicast = _interface_add(name, 0, 0);
540 sa = (struct sockaddr_in *) ifa->ifa_addr;
541 memcpy(&unicast->v4_addr, &sa->sin_addr, sizeof(unicast->v4_addr));
542 inet_ntop(AF_INET, &sa->sin_addr, unicast->v4_addrs, sizeof(unicast->v4_addrs));
544 v4 = _interface_add(name, 1, 0);
547 memcpy(&v4->v4_addr, &sa->sin_addr, sizeof(v4->v4_addr));
548 inet_ntop(AF_INET, &sa->sin_addr, v4->v4_addrs, sizeof(v4->v4_addrs));
554 if (ifa->ifa_addr->sa_family == AF_INET6 && !v6) {
555 uint8_t ll_prefix[] = {0xfe, 0x80 };
556 struct sockaddr_in6 *sa6;
558 if (cfg_proto && (cfg_proto != 6))
561 sa6 = (struct sockaddr_in6 *) ifa->ifa_addr;
562 if (memcmp(&sa6->sin6_addr, &ll_prefix, 2))
565 unicast = _interface_add(name, 0, 1);
568 memcpy(&unicast->v6_addr, &sa6->sin6_addr, sizeof(unicast->v6_addr));
569 inet_ntop(AF_INET6, &sa6->sin6_addr, unicast->v6_addrs, sizeof(unicast->v6_addrs));
571 v6 = _interface_add(name, 1, 1);
574 memcpy(&v6->v6_addr, &sa6->sin6_addr, sizeof(v6->v6_addr));
575 inet_ntop(AF_INET6, &sa6->sin6_addr, v6->v6_addrs, sizeof(v6->v6_addrs));
587 VLIST_TREE(interfaces, avl_strcmp, iface_update_cb, false, false);