2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License.
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9 * GNU General Public License for more details.
11 * You should have received a copy of the GNU General Public License
12 * along with this program; if not, write to the Free Software
13 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
15 * Copyright (C) 2020 embedd.ch
16 * Copyright (C) 2020 Felix Fietkau <nbd@nbd.name>
17 * Copyright (C) 2020 John Crispin <john@phrozen.org>
22 #include <sys/types.h>
23 #include <sys/socket.h>
24 #include <netinet/in.h>
26 #include <arpa/inet.h>
30 #include <libubox/vlist.h>
31 #include <libubox/avl-cmp.h>
32 #include <libubox/usock.h>
37 static uint32_t local_id
;
38 static struct uloop_fd remote_fd
;
39 static struct uloop_timeout remote_timer
;
40 static struct uloop_timeout reload_timer
;
42 static struct blob_buf buf
;
43 static uint32_t msg_seq
;
46 struct vlist_node node
;
51 interfaces_update_cb(struct vlist_tree
*tree
,
52 struct vlist_node
*node_new
,
53 struct vlist_node
*node_old
);
55 static int remote_host_cmp(const void *k1
, const void *k2
, void *ptr
)
57 unsigned long v1
= (unsigned long) k1
;
58 unsigned long v2
= (unsigned long) k2
;
63 static VLIST_TREE(interfaces
, avl_strcmp
, interfaces_update_cb
, true, true);
64 LIST_HEAD(remote_nodes
);
65 AVL_TREE(remote_hosts
, remote_host_cmp
, false, NULL
);
68 interface_name(struct interface
*iface
)
70 return iface
->node
.avl
.key
;
74 interface_check(struct interface
*iface
)
76 iface
->ifindex
= if_nametoindex(interface_name(iface
));
77 uloop_timeout_set(&reload_timer
, 1);
81 interface_init(struct interface
*iface
)
83 interface_check(iface
);
87 interface_free(struct interface
*iface
)
89 avl_delete(&interfaces
.avl
, &iface
->node
.avl
);
94 interfaces_update_cb(struct vlist_tree
*tree
,
95 struct vlist_node
*node_new
,
96 struct vlist_node
*node_old
)
98 struct interface
*iface
;
100 if (node_new
&& node_old
) {
101 iface
= container_of(node_new
, struct interface
, node
);
103 iface
= container_of(node_old
, struct interface
, node
);
104 interface_check(iface
);
105 } else if (node_old
) {
106 iface
= container_of(node_old
, struct interface
, node
);
107 interface_free(iface
);
109 iface
= container_of(node_new
, struct interface
, node
);
110 interface_init(iface
);
114 void usteer_interface_add(const char *name
)
116 struct interface
*iface
;
119 iface
= calloc_a(sizeof(*iface
), &name_buf
, strlen(name
) + 1);
120 strcpy(name_buf
, name
);
121 vlist_add(&interfaces
, &iface
->node
, name_buf
);
124 void config_set_interfaces(struct blob_attr
*data
)
126 struct blob_attr
*cur
;
132 if (!blobmsg_check_attr_list(data
, BLOBMSG_TYPE_STRING
))
135 vlist_update(&interfaces
);
136 blobmsg_for_each_attr(cur
, data
, rem
) {
137 usteer_interface_add(blobmsg_data(cur
));
139 vlist_flush(&interfaces
);
142 void config_get_interfaces(struct blob_buf
*buf
)
144 struct interface
*iface
;
147 c
= blobmsg_open_array(buf
, "interfaces");
148 vlist_for_each_element(&interfaces
, iface
, node
) {
149 blobmsg_add_string(buf
, NULL
, interface_name(iface
));
151 blobmsg_close_array(buf
, c
);
155 interface_add_station(struct usteer_remote_node
*node
, struct blob_attr
*data
)
159 struct apmsg_sta msg
;
162 if (!parse_apmsg_sta(&msg
, data
)) {
163 MSG(DEBUG
, "Cannot parse station in message\n");
167 if (msg
.timeout
<= 0) {
168 MSG(DEBUG
, "Refuse to add an already expired station entry\n");
172 sta
= usteer_sta_get(msg
.addr
, true);
176 si
= usteer_sta_info_get(sta
, &node
->node
, &create
);
180 si
->connected
= msg
.connected
;
181 si
->signal
= msg
.signal
;
182 si
->seen
= current_time
- msg
.seen
;
183 usteer_sta_info_update_timeout(si
, msg
.timeout
);
187 remote_node_free(struct usteer_remote_node
*node
)
189 struct usteer_remote_host
*host
= node
->host
;
191 list_del(&node
->list
);
192 list_del(&node
->host_list
);
193 usteer_sta_node_cleanup(&node
->node
);
196 if (!list_empty(&host
->nodes
))
199 avl_delete(&remote_hosts
, &host
->avl
);
204 static struct usteer_remote_host
*
205 interface_get_host(const char *addr
, unsigned long id
)
207 struct usteer_remote_host
*host
;
209 host
= avl_find_element(&remote_hosts
, (void *)id
, host
, avl
);
213 host
= calloc(1, sizeof(*host
));
214 host
->avl
.key
= (void *)id
;
215 INIT_LIST_HEAD(&host
->nodes
);
216 avl_insert(&remote_hosts
, &host
->avl
);
219 if (host
->addr
&& !strcmp(host
->addr
, addr
))
223 host
->addr
= strdup(addr
);
228 static struct usteer_remote_node
*
229 interface_get_node(struct usteer_remote_host
*host
, const char *name
)
231 struct usteer_remote_node
*node
;
232 int addr_len
= strlen(host
->addr
);
235 list_for_each_entry(node
, &host
->nodes
, host_list
)
236 if (!strcmp(node
->name
, name
))
239 node
= calloc_a(sizeof(*node
), &buf
, addr_len
+ 1 + strlen(name
) + 1);
240 node
->node
.type
= NODE_TYPE_REMOTE
;
242 sprintf(buf
, "%s#%s", host
->addr
, name
);
243 node
->node
.avl
.key
= buf
;
244 node
->name
= buf
+ addr_len
+ 1;
246 INIT_LIST_HEAD(&node
->node
.sta_info
);
248 list_add_tail(&node
->list
, &remote_nodes
);
249 list_add_tail(&node
->host_list
, &host
->nodes
);
255 interface_add_node(struct usteer_remote_host
*host
, struct blob_attr
*data
)
257 struct usteer_remote_node
*node
;
258 struct apmsg_node msg
;
259 struct blob_attr
*cur
;
262 if (!parse_apmsg_node(&msg
, data
)) {
263 MSG(DEBUG
, "Cannot parse node in message\n");
267 node
= interface_get_node(host
, msg
.name
);
269 node
->node
.freq
= msg
.freq
;
270 node
->node
.n_assoc
= msg
.n_assoc
;
271 node
->node
.max_assoc
= msg
.max_assoc
;
272 node
->node
.noise
= msg
.noise
;
273 node
->node
.load
= msg
.load
;
275 memcpy(node
->node
.bssid
, msg
.bssid
, sizeof(node
->node
.bssid
));
277 snprintf(node
->node
.ssid
, sizeof(node
->node
.ssid
), "%s", msg
.ssid
);
278 usteer_node_set_blob(&node
->node
.rrm_nr
, msg
.rrm_nr
);
279 usteer_node_set_blob(&node
->node
.node_info
, msg
.node_info
);
281 blob_for_each_attr(cur
, msg
.stations
, rem
)
282 interface_add_station(node
, cur
);
286 interface_recv_msg(struct interface
*iface
, char *addr_str
, void *buf
, int len
)
288 struct usteer_remote_host
*host
;
289 struct blob_attr
*data
= buf
;
291 struct blob_attr
*cur
;
294 if (blob_pad_len(data
) != len
) {
295 MSG(DEBUG
, "Invalid message length (header: %d, real: %d)\n", blob_pad_len(data
), len
);
299 if (!parse_apmsg(&msg
, data
)) {
300 MSG(DEBUG
, "Missing fields in message\n");
304 if (msg
.id
== local_id
)
307 MSG(NETWORK
, "Received message on %s (id=%08x->%08x seq=%d len=%d)\n",
308 interface_name(iface
), msg
.id
, local_id
, msg
.seq
, len
);
310 host
= interface_get_host(addr_str
, msg
.id
);
311 usteer_node_set_blob(&host
->host_info
, msg
.host_info
);
313 blob_for_each_attr(cur
, msg
.nodes
, rem
)
314 interface_add_node(host
, cur
);
317 static struct interface
*
318 interface_find_by_ifindex(int index
)
320 struct interface
*iface
;
322 vlist_for_each_element(&interfaces
, iface
, node
) {
323 if (iface
->ifindex
== index
)
331 interface_recv_v4(struct uloop_fd
*u
, unsigned int events
)
333 static char buf
[APMGR_BUFLEN
];
334 static char cmsg_buf
[( CMSG_SPACE(sizeof(struct in_pktinfo
)) + sizeof(int)) + 1];
335 static struct sockaddr_in sin
;
336 char addr_str
[INET_ADDRSTRLEN
];
337 static struct iovec iov
= {
339 .iov_len
= sizeof(buf
)
341 static struct msghdr msg
= {
343 .msg_namelen
= sizeof(sin
),
346 .msg_control
= cmsg_buf
,
347 .msg_controllen
= sizeof(cmsg_buf
),
349 struct cmsghdr
*cmsg
;
353 struct in_pktinfo
*pkti
= NULL
;
354 struct interface
*iface
;
356 len
= recvmsg(u
->fd
, &msg
, 0);
370 for (cmsg
= CMSG_FIRSTHDR(&msg
); cmsg
; cmsg
= CMSG_NXTHDR(&msg
, cmsg
)) {
371 if (cmsg
->cmsg_type
!= IP_PKTINFO
)
374 pkti
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
378 MSG(DEBUG
, "Received packet without ifindex\n");
382 iface
= interface_find_by_ifindex(pkti
->ipi_ifindex
);
384 MSG(DEBUG
, "Received packet from unconfigured interface %d\n", pkti
->ipi_ifindex
);
388 inet_ntop(AF_INET
, &sin
.sin_addr
, addr_str
, sizeof(addr_str
));
390 interface_recv_msg(iface
, addr_str
, buf
, len
);
395 static void interface_recv_v6(struct uloop_fd
*u
, unsigned int events
){
396 static char buf
[APMGR_BUFLEN
];
397 static char cmsg_buf
[( CMSG_SPACE(sizeof(struct in6_pktinfo
)) + sizeof(int)) + 1];
398 static struct sockaddr_in6 sin
;
399 static struct iovec iov
= {
401 .iov_len
= sizeof(buf
)
403 static struct msghdr msg
= {
405 .msg_namelen
= sizeof(sin
),
408 .msg_control
= cmsg_buf
,
409 .msg_controllen
= sizeof(cmsg_buf
),
411 struct cmsghdr
*cmsg
;
412 char addr_str
[INET6_ADDRSTRLEN
];
416 struct in6_pktinfo
*pkti
= NULL
;
417 struct interface
*iface
;
419 len
= recvmsg(u
->fd
, &msg
, 0);
433 for (cmsg
= CMSG_FIRSTHDR(&msg
); cmsg
; cmsg
= CMSG_NXTHDR(&msg
, cmsg
)) {
434 if (cmsg
->cmsg_type
!= IPV6_PKTINFO
)
437 pkti
= (struct in6_pktinfo
*) CMSG_DATA(cmsg
);
441 MSG(DEBUG
, "Received packet without ifindex\n");
445 iface
= interface_find_by_ifindex(pkti
->ipi6_ifindex
);
447 MSG(DEBUG
, "Received packet from unconfigured interface %d\n", pkti
->ipi6_ifindex
);
451 inet_ntop(AF_INET6
, &sin
.sin6_addr
, addr_str
, sizeof(addr_str
));
452 if (sin
.sin6_addr
.s6_addr
[0] == 0) {
453 /* IPv4 mapped address. Ignore. */
457 interface_recv_msg(iface
, addr_str
, buf
, len
);
461 static void interface_send_msg_v4(struct interface
*iface
, struct blob_attr
*data
)
463 static size_t cmsg_data
[( CMSG_SPACE(sizeof(struct in_pktinfo
)) / sizeof(size_t)) + 1];
464 static struct sockaddr_in a
;
465 static struct iovec iov
;
466 static struct msghdr m
= {
467 .msg_name
= (struct sockaddr
*) &a
,
468 .msg_namelen
= sizeof(a
),
471 .msg_control
= cmsg_data
,
472 .msg_controllen
= CMSG_LEN(sizeof(struct in_pktinfo
)),
474 struct in_pktinfo
*pkti
;
475 struct cmsghdr
*cmsg
;
477 a
.sin_family
= AF_INET
;
478 a
.sin_port
= htons(APMGR_PORT
);
479 a
.sin_addr
.s_addr
= ~0;
481 memset(cmsg_data
, 0, sizeof(cmsg_data
));
482 cmsg
= CMSG_FIRSTHDR(&m
);
483 cmsg
->cmsg_len
= m
.msg_controllen
;
484 cmsg
->cmsg_level
= IPPROTO_IP
;
485 cmsg
->cmsg_type
= IP_PKTINFO
;
487 pkti
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
488 pkti
->ipi_ifindex
= iface
->ifindex
;
491 iov
.iov_len
= blob_pad_len(data
);
493 if (sendmsg(remote_fd
.fd
, &m
, 0) < 0)
498 static void interface_send_msg_v6(struct interface
*iface
, struct blob_attr
*data
) {
499 static struct sockaddr_in6 groupSock
= {};
501 groupSock
.sin6_family
= AF_INET6
;
502 inet_pton(AF_INET6
, APMGR_V6_MCAST_GROUP
, &groupSock
.sin6_addr
);
503 groupSock
.sin6_port
= htons(APMGR_PORT
);
505 setsockopt(remote_fd
.fd
, IPPROTO_IPV6
, IPV6_MULTICAST_IF
, &iface
->ifindex
, sizeof(iface
->ifindex
));
507 if (sendto(remote_fd
.fd
, data
, blob_pad_len(data
), 0, (const struct sockaddr
*)&groupSock
, sizeof(groupSock
)) < 0)
511 static void interface_send_msg(struct interface
*iface
, struct blob_attr
*data
){
513 interface_send_msg_v6(iface
, data
);
515 interface_send_msg_v4(iface
, data
);
519 static void usteer_send_sta_info(struct sta_info
*sta
)
521 int seen
= current_time
- sta
->seen
;
524 c
= blob_nest_start(&buf
, 0);
525 blob_put(&buf
, APMSG_STA_ADDR
, sta
->sta
->addr
, 6);
526 blob_put_int8(&buf
, APMSG_STA_CONNECTED
, !!sta
->connected
);
527 blob_put_int32(&buf
, APMSG_STA_SIGNAL
, sta
->signal
);
528 blob_put_int32(&buf
, APMSG_STA_SEEN
, seen
);
529 blob_put_int32(&buf
, APMSG_STA_TIMEOUT
, config
.local_sta_timeout
- seen
);
530 blob_nest_end(&buf
, c
);
533 static void usteer_send_node(struct usteer_node
*node
, struct sta_info
*sta
)
537 c
= blob_nest_start(&buf
, 0);
539 blob_put_string(&buf
, APMSG_NODE_NAME
, usteer_node_name(node
));
540 blob_put_string(&buf
, APMSG_NODE_SSID
, node
->ssid
);
541 blob_put_int32(&buf
, APMSG_NODE_FREQ
, node
->freq
);
542 blob_put_int32(&buf
, APMSG_NODE_NOISE
, node
->noise
);
543 blob_put_int32(&buf
, APMSG_NODE_LOAD
, node
->load
);
544 blob_put_int32(&buf
, APMSG_NODE_N_ASSOC
, node
->n_assoc
);
545 blob_put_int32(&buf
, APMSG_NODE_MAX_ASSOC
, node
->max_assoc
);
546 blob_put(&buf
, APMSG_NODE_BSSID
, node
->bssid
, sizeof(node
->bssid
));
548 r
= blob_nest_start(&buf
, APMSG_NODE_RRM_NR
);
549 blobmsg_add_field(&buf
, BLOBMSG_TYPE_ARRAY
, "",
550 blobmsg_data(node
->rrm_nr
),
551 blobmsg_data_len(node
->rrm_nr
));
552 blob_nest_end(&buf
, r
);
556 blob_put(&buf
, APMSG_NODE_NODE_INFO
,
557 blob_data(node
->node_info
),
558 blob_len(node
->node_info
));
560 s
= blob_nest_start(&buf
, APMSG_NODE_STATIONS
);
563 usteer_send_sta_info(sta
);
565 list_for_each_entry(sta
, &node
->sta_info
, node_list
)
566 usteer_send_sta_info(sta
);
569 blob_nest_end(&buf
, s
);
571 blob_nest_end(&buf
, c
);
575 usteer_check_timeout(void)
577 struct usteer_remote_node
*node
, *tmp
;
578 int timeout
= config
.remote_node_timeout
;
580 list_for_each_entry_safe(node
, tmp
, &remote_nodes
, list
) {
581 if (node
->check
++ > timeout
)
582 remote_node_free(node
);
587 usteer_update_init(void)
589 blob_buf_init(&buf
, 0);
590 blob_put_int32(&buf
, APMSG_ID
, local_id
);
591 blob_put_int32(&buf
, APMSG_SEQ
, ++msg_seq
);
593 blob_put(&buf
, APMSG_HOST_INFO
,
594 blob_data(host_info_blob
),
595 blob_len(host_info_blob
));
597 return blob_nest_start(&buf
, APMSG_NODES
);
601 usteer_update_send(void *c
)
603 struct interface
*iface
;
605 blob_nest_end(&buf
, c
);
607 vlist_for_each_element(&interfaces
, iface
, node
)
608 interface_send_msg(iface
, buf
.head
);
612 usteer_send_sta_update(struct sta_info
*si
)
614 void *c
= usteer_update_init();
615 usteer_send_node(si
->node
, si
);
616 usteer_update_send(c
);
620 usteer_send_update_timer(struct uloop_timeout
*t
)
622 struct usteer_node
*node
;
625 usteer_update_time();
626 uloop_timeout_set(t
, config
.remote_update_interval
);
628 if (!avl_is_empty(&local_nodes
) || host_info_blob
) {
629 c
= usteer_update_init();
630 for_each_local_node(node
)
631 usteer_send_node(node
, NULL
);
633 usteer_update_send(c
);
635 usteer_check_timeout();
639 usteer_init_local_id(void)
643 f
= fopen("/dev/urandom", "r");
645 perror("fopen(/dev/urandom)");
649 if (fread(&local_id
, sizeof(local_id
), 1, f
) < 1)
656 static int usteer_create_v4_socket() {
660 fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
|
661 USOCK_NUMERIC
| USOCK_IPV4ONLY
,
662 "0.0.0.0", APMGR_PORT_STR
);
668 if (setsockopt(fd
, IPPROTO_IP
, IP_PKTINFO
, &yes
, sizeof(yes
)) < 0)
669 perror("setsockopt(IP_PKTINFO)");
671 if (setsockopt(fd
, SOL_SOCKET
, SO_BROADCAST
, &yes
, sizeof(yes
)) < 0)
672 perror("setsockopt(SO_BROADCAST)");
678 static int usteer_create_v6_socket() {
679 struct interface
*iface
;
680 struct ipv6_mreq group
;
684 fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
|
685 USOCK_NUMERIC
| USOCK_IPV6ONLY
,
686 "::", APMGR_PORT_STR
);
692 if (!inet_pton(AF_INET6
, APMGR_V6_MCAST_GROUP
, &group
.ipv6mr_multiaddr
.s6_addr
))
693 perror("inet_pton(AF_INET6)");
695 /* Membership has to be added for every interface we listen on. */
696 vlist_for_each_element(&interfaces
, iface
, node
) {
697 group
.ipv6mr_interface
= iface
->ifindex
;
698 if(setsockopt(fd
, IPPROTO_IPV6
, IPV6_ADD_MEMBERSHIP
, (char *)&group
, sizeof group
) < 0)
699 perror("setsockopt(IPV6_ADD_MEMBERSHIP)");
702 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &yes
, sizeof(yes
)) < 0)
703 perror("setsockopt(IPV6_RECVPKTINFO)");
705 if (setsockopt(fd
, SOL_SOCKET
, SO_BROADCAST
, &yes
, sizeof(yes
)) < 0)
706 perror("setsockopt(SO_BROADCAST)");
711 static void usteer_reload_timer(struct uloop_timeout
*t
) {
712 /* Remove uloop descriptor */
713 if (remote_fd
.fd
&& remote_fd
.registered
) {
714 uloop_fd_delete(&remote_fd
);
719 remote_fd
.fd
= usteer_create_v6_socket();
720 remote_fd
.cb
= interface_recv_v6
;
722 remote_fd
.fd
= usteer_create_v4_socket();
723 remote_fd
.cb
= interface_recv_v4
;
726 if (remote_fd
.fd
< 0)
729 uloop_fd_add(&remote_fd
, ULOOP_READ
);
732 int usteer_interface_init(void)
734 if (usteer_init_local_id())
737 remote_timer
.cb
= usteer_send_update_timer
;
738 remote_timer
.cb(&remote_timer
);
740 reload_timer
.cb
= usteer_reload_timer
;
741 reload_timer
.cb(&reload_timer
);