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
)
158 struct sta_info
*si
, *local_si
;
159 struct apmsg_sta msg
;
160 struct usteer_node
*local_node
;
164 if (!parse_apmsg_sta(&msg
, data
)) {
165 MSG(DEBUG
, "Cannot parse station in message\n");
169 if (msg
.timeout
<= 0) {
170 MSG(DEBUG
, "Refuse to add an already expired station entry\n");
174 sta
= usteer_sta_get(msg
.addr
, true);
178 si
= usteer_sta_info_get(sta
, &node
->node
, &create
);
182 connect_change
= si
->connected
!= msg
.connected
;
183 si
->connected
= msg
.connected
;
184 si
->signal
= msg
.signal
;
185 si
->seen
= current_time
- msg
.seen
;
186 si
->last_connected
= current_time
- msg
.last_connected
;
188 /* Check if client roamed to this foreign node */
189 if ((connect_change
|| create
) && si
->connected
== STA_CONNECTED
) {
190 for_each_local_node(local_node
) {
191 local_si
= usteer_sta_info_get(sta
, local_node
, NULL
);
195 if (current_time
- local_si
->last_connected
< config
.roam_process_timeout
) {
196 node
->node
.roam_events
.target
++;
202 usteer_sta_info_update_timeout(si
, msg
.timeout
);
206 remote_node_free(struct usteer_remote_node
*node
)
208 struct usteer_remote_host
*host
= node
->host
;
210 list_del(&node
->list
);
211 list_del(&node
->host_list
);
212 usteer_sta_node_cleanup(&node
->node
);
215 if (!list_empty(&host
->nodes
))
218 avl_delete(&remote_hosts
, &host
->avl
);
223 static struct usteer_remote_host
*
224 interface_get_host(const char *addr
, unsigned long id
)
226 struct usteer_remote_host
*host
;
228 host
= avl_find_element(&remote_hosts
, (void *)id
, host
, avl
);
232 host
= calloc(1, sizeof(*host
));
233 host
->avl
.key
= (void *)id
;
234 INIT_LIST_HEAD(&host
->nodes
);
235 avl_insert(&remote_hosts
, &host
->avl
);
238 if (host
->addr
&& !strcmp(host
->addr
, addr
))
242 host
->addr
= strdup(addr
);
247 static struct usteer_remote_node
*
248 interface_get_node(struct usteer_remote_host
*host
, const char *name
)
250 struct usteer_remote_node
*node
;
251 int addr_len
= strlen(host
->addr
);
254 list_for_each_entry(node
, &host
->nodes
, host_list
)
255 if (!strcmp(node
->name
, name
))
258 node
= calloc_a(sizeof(*node
), &buf
, addr_len
+ 1 + strlen(name
) + 1);
259 node
->node
.type
= NODE_TYPE_REMOTE
;
260 node
->node
.created
= current_time
;
262 sprintf(buf
, "%s#%s", host
->addr
, name
);
263 node
->node
.avl
.key
= buf
;
264 node
->name
= buf
+ addr_len
+ 1;
266 INIT_LIST_HEAD(&node
->node
.sta_info
);
268 list_add_tail(&node
->list
, &remote_nodes
);
269 list_add_tail(&node
->host_list
, &host
->nodes
);
275 interface_add_node(struct usteer_remote_host
*host
, struct blob_attr
*data
)
277 struct usteer_remote_node
*node
;
278 struct apmsg_node msg
;
279 struct blob_attr
*cur
;
282 if (!parse_apmsg_node(&msg
, data
)) {
283 MSG(DEBUG
, "Cannot parse node in message\n");
287 node
= interface_get_node(host
, msg
.name
);
289 node
->node
.freq
= msg
.freq
;
290 node
->node
.channel
= msg
.channel
;
291 node
->node
.op_class
= msg
.op_class
;
292 node
->node
.n_assoc
= msg
.n_assoc
;
293 node
->node
.max_assoc
= msg
.max_assoc
;
294 node
->node
.noise
= msg
.noise
;
295 node
->node
.load
= msg
.load
;
297 memcpy(node
->node
.bssid
, msg
.bssid
, sizeof(node
->node
.bssid
));
299 snprintf(node
->node
.ssid
, sizeof(node
->node
.ssid
), "%s", msg
.ssid
);
300 usteer_node_set_blob(&node
->node
.rrm_nr
, msg
.rrm_nr
);
301 usteer_node_set_blob(&node
->node
.node_info
, msg
.node_info
);
303 blob_for_each_attr(cur
, msg
.stations
, rem
)
304 interface_add_station(node
, cur
);
308 interface_recv_msg(struct interface
*iface
, char *addr_str
, void *buf
, int len
)
310 struct usteer_remote_host
*host
;
311 struct blob_attr
*data
= buf
;
313 struct blob_attr
*cur
;
316 if (blob_pad_len(data
) != len
) {
317 MSG(DEBUG
, "Invalid message length (header: %d, real: %d)\n", blob_pad_len(data
), len
);
321 if (!parse_apmsg(&msg
, data
)) {
322 MSG(DEBUG
, "Missing fields in message\n");
326 if (msg
.id
== local_id
)
329 MSG(NETWORK
, "Received message on %s (id=%08x->%08x seq=%d len=%d)\n",
330 interface_name(iface
), msg
.id
, local_id
, msg
.seq
, len
);
332 host
= interface_get_host(addr_str
, msg
.id
);
333 usteer_node_set_blob(&host
->host_info
, msg
.host_info
);
335 blob_for_each_attr(cur
, msg
.nodes
, rem
)
336 interface_add_node(host
, cur
);
339 static struct interface
*
340 interface_find_by_ifindex(int index
)
342 struct interface
*iface
;
344 vlist_for_each_element(&interfaces
, iface
, node
) {
345 if (iface
->ifindex
== index
)
353 interface_recv_v4(struct uloop_fd
*u
, unsigned int events
)
355 static char buf
[APMGR_BUFLEN
];
356 static char cmsg_buf
[( CMSG_SPACE(sizeof(struct in_pktinfo
)) + sizeof(int)) + 1];
357 static struct sockaddr_in sin
;
358 char addr_str
[INET_ADDRSTRLEN
];
359 static struct iovec iov
= {
361 .iov_len
= sizeof(buf
)
363 static struct msghdr msg
= {
365 .msg_namelen
= sizeof(sin
),
368 .msg_control
= cmsg_buf
,
369 .msg_controllen
= sizeof(cmsg_buf
),
371 struct cmsghdr
*cmsg
;
375 struct in_pktinfo
*pkti
= NULL
;
376 struct interface
*iface
;
378 len
= recvmsg(u
->fd
, &msg
, 0);
392 for (cmsg
= CMSG_FIRSTHDR(&msg
); cmsg
; cmsg
= CMSG_NXTHDR(&msg
, cmsg
)) {
393 if (cmsg
->cmsg_type
!= IP_PKTINFO
)
396 pkti
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
400 MSG(DEBUG
, "Received packet without ifindex\n");
404 iface
= interface_find_by_ifindex(pkti
->ipi_ifindex
);
406 MSG(DEBUG
, "Received packet from unconfigured interface %d\n", pkti
->ipi_ifindex
);
410 inet_ntop(AF_INET
, &sin
.sin_addr
, addr_str
, sizeof(addr_str
));
412 interface_recv_msg(iface
, addr_str
, buf
, len
);
417 static void interface_recv_v6(struct uloop_fd
*u
, unsigned int events
){
418 static char buf
[APMGR_BUFLEN
];
419 static char cmsg_buf
[( CMSG_SPACE(sizeof(struct in6_pktinfo
)) + sizeof(int)) + 1];
420 static struct sockaddr_in6 sin
;
421 static struct iovec iov
= {
423 .iov_len
= sizeof(buf
)
425 static struct msghdr msg
= {
427 .msg_namelen
= sizeof(sin
),
430 .msg_control
= cmsg_buf
,
431 .msg_controllen
= sizeof(cmsg_buf
),
433 struct cmsghdr
*cmsg
;
434 char addr_str
[INET6_ADDRSTRLEN
];
438 struct in6_pktinfo
*pkti
= NULL
;
439 struct interface
*iface
;
441 len
= recvmsg(u
->fd
, &msg
, 0);
455 for (cmsg
= CMSG_FIRSTHDR(&msg
); cmsg
; cmsg
= CMSG_NXTHDR(&msg
, cmsg
)) {
456 if (cmsg
->cmsg_type
!= IPV6_PKTINFO
)
459 pkti
= (struct in6_pktinfo
*) CMSG_DATA(cmsg
);
463 MSG(DEBUG
, "Received packet without ifindex\n");
467 iface
= interface_find_by_ifindex(pkti
->ipi6_ifindex
);
469 MSG(DEBUG
, "Received packet from unconfigured interface %d\n", pkti
->ipi6_ifindex
);
473 inet_ntop(AF_INET6
, &sin
.sin6_addr
, addr_str
, sizeof(addr_str
));
474 if (sin
.sin6_addr
.s6_addr
[0] == 0) {
475 /* IPv4 mapped address. Ignore. */
479 interface_recv_msg(iface
, addr_str
, buf
, len
);
483 static void interface_send_msg_v4(struct interface
*iface
, struct blob_attr
*data
)
485 static size_t cmsg_data
[( CMSG_SPACE(sizeof(struct in_pktinfo
)) / sizeof(size_t)) + 1];
486 static struct sockaddr_in a
;
487 static struct iovec iov
;
488 static struct msghdr m
= {
489 .msg_name
= (struct sockaddr
*) &a
,
490 .msg_namelen
= sizeof(a
),
493 .msg_control
= cmsg_data
,
494 .msg_controllen
= CMSG_LEN(sizeof(struct in_pktinfo
)),
496 struct in_pktinfo
*pkti
;
497 struct cmsghdr
*cmsg
;
499 a
.sin_family
= AF_INET
;
500 a
.sin_port
= htons(APMGR_PORT
);
501 a
.sin_addr
.s_addr
= ~0;
503 memset(cmsg_data
, 0, sizeof(cmsg_data
));
504 cmsg
= CMSG_FIRSTHDR(&m
);
505 cmsg
->cmsg_len
= m
.msg_controllen
;
506 cmsg
->cmsg_level
= IPPROTO_IP
;
507 cmsg
->cmsg_type
= IP_PKTINFO
;
509 pkti
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
510 pkti
->ipi_ifindex
= iface
->ifindex
;
513 iov
.iov_len
= blob_pad_len(data
);
515 if (sendmsg(remote_fd
.fd
, &m
, 0) < 0)
520 static void interface_send_msg_v6(struct interface
*iface
, struct blob_attr
*data
) {
521 static struct sockaddr_in6 groupSock
= {};
523 groupSock
.sin6_family
= AF_INET6
;
524 inet_pton(AF_INET6
, APMGR_V6_MCAST_GROUP
, &groupSock
.sin6_addr
);
525 groupSock
.sin6_port
= htons(APMGR_PORT
);
527 setsockopt(remote_fd
.fd
, IPPROTO_IPV6
, IPV6_MULTICAST_IF
, &iface
->ifindex
, sizeof(iface
->ifindex
));
529 if (sendto(remote_fd
.fd
, data
, blob_pad_len(data
), 0, (const struct sockaddr
*)&groupSock
, sizeof(groupSock
)) < 0)
533 static void interface_send_msg(struct interface
*iface
, struct blob_attr
*data
){
535 interface_send_msg_v6(iface
, data
);
537 interface_send_msg_v4(iface
, data
);
541 static void usteer_send_sta_info(struct sta_info
*sta
)
543 int seen
= current_time
- sta
->seen
;
544 int last_connected
= !!sta
->connected
? 0 : current_time
- sta
->last_connected
;
547 c
= blob_nest_start(&buf
, 0);
548 blob_put(&buf
, APMSG_STA_ADDR
, sta
->sta
->addr
, 6);
549 blob_put_int8(&buf
, APMSG_STA_CONNECTED
, !!sta
->connected
);
550 blob_put_int32(&buf
, APMSG_STA_SIGNAL
, sta
->signal
);
551 blob_put_int32(&buf
, APMSG_STA_SEEN
, seen
);
552 blob_put_int32(&buf
, APMSG_STA_LAST_CONNECTED
, last_connected
);
553 blob_put_int32(&buf
, APMSG_STA_TIMEOUT
, config
.local_sta_timeout
- seen
);
554 blob_nest_end(&buf
, c
);
557 static void usteer_send_node(struct usteer_node
*node
, struct sta_info
*sta
)
561 c
= blob_nest_start(&buf
, 0);
563 blob_put_string(&buf
, APMSG_NODE_NAME
, usteer_node_name(node
));
564 blob_put_string(&buf
, APMSG_NODE_SSID
, node
->ssid
);
565 blob_put_int32(&buf
, APMSG_NODE_FREQ
, node
->freq
);
566 blob_put_int32(&buf
, APMSG_NODE_NOISE
, node
->noise
);
567 blob_put_int32(&buf
, APMSG_NODE_LOAD
, node
->load
);
568 blob_put_int32(&buf
, APMSG_NODE_N_ASSOC
, node
->n_assoc
);
569 blob_put_int32(&buf
, APMSG_NODE_MAX_ASSOC
, node
->max_assoc
);
570 blob_put_int32(&buf
, APMSG_NODE_OP_CLASS
, node
->op_class
);
571 blob_put_int32(&buf
, APMSG_NODE_CHANNEL
, node
->channel
);
572 blob_put(&buf
, APMSG_NODE_BSSID
, node
->bssid
, sizeof(node
->bssid
));
574 r
= blob_nest_start(&buf
, APMSG_NODE_RRM_NR
);
575 blobmsg_add_field(&buf
, BLOBMSG_TYPE_ARRAY
, "",
576 blobmsg_data(node
->rrm_nr
),
577 blobmsg_data_len(node
->rrm_nr
));
578 blob_nest_end(&buf
, r
);
582 blob_put(&buf
, APMSG_NODE_NODE_INFO
,
583 blob_data(node
->node_info
),
584 blob_len(node
->node_info
));
586 s
= blob_nest_start(&buf
, APMSG_NODE_STATIONS
);
589 usteer_send_sta_info(sta
);
591 list_for_each_entry(sta
, &node
->sta_info
, node_list
)
592 usteer_send_sta_info(sta
);
595 blob_nest_end(&buf
, s
);
597 blob_nest_end(&buf
, c
);
601 usteer_check_timeout(void)
603 struct usteer_remote_node
*node
, *tmp
;
604 int timeout
= config
.remote_node_timeout
;
606 list_for_each_entry_safe(node
, tmp
, &remote_nodes
, list
) {
607 if (node
->check
++ > timeout
)
608 remote_node_free(node
);
613 usteer_update_init(void)
615 blob_buf_init(&buf
, 0);
616 blob_put_int32(&buf
, APMSG_ID
, local_id
);
617 blob_put_int32(&buf
, APMSG_SEQ
, ++msg_seq
);
619 blob_put(&buf
, APMSG_HOST_INFO
,
620 blob_data(host_info_blob
),
621 blob_len(host_info_blob
));
623 return blob_nest_start(&buf
, APMSG_NODES
);
627 usteer_update_send(void *c
)
629 struct interface
*iface
;
631 blob_nest_end(&buf
, c
);
633 vlist_for_each_element(&interfaces
, iface
, node
)
634 interface_send_msg(iface
, buf
.head
);
638 usteer_send_sta_update(struct sta_info
*si
)
640 void *c
= usteer_update_init();
641 usteer_send_node(si
->node
, si
);
642 usteer_update_send(c
);
646 usteer_send_update_timer(struct uloop_timeout
*t
)
648 struct usteer_node
*node
;
651 usteer_update_time();
652 uloop_timeout_set(t
, config
.remote_update_interval
);
654 if (!avl_is_empty(&local_nodes
) || host_info_blob
) {
655 c
= usteer_update_init();
656 for_each_local_node(node
)
657 usteer_send_node(node
, NULL
);
659 usteer_update_send(c
);
661 usteer_check_timeout();
665 usteer_init_local_id(void)
669 f
= fopen("/dev/urandom", "r");
671 perror("fopen(/dev/urandom)");
675 if (fread(&local_id
, sizeof(local_id
), 1, f
) < 1)
682 static int usteer_create_v4_socket() {
686 fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
|
687 USOCK_NUMERIC
| USOCK_IPV4ONLY
,
688 "0.0.0.0", APMGR_PORT_STR
);
694 if (setsockopt(fd
, IPPROTO_IP
, IP_PKTINFO
, &yes
, sizeof(yes
)) < 0)
695 perror("setsockopt(IP_PKTINFO)");
697 if (setsockopt(fd
, SOL_SOCKET
, SO_BROADCAST
, &yes
, sizeof(yes
)) < 0)
698 perror("setsockopt(SO_BROADCAST)");
704 static int usteer_create_v6_socket() {
705 struct interface
*iface
;
706 struct ipv6_mreq group
;
710 fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
|
711 USOCK_NUMERIC
| USOCK_IPV6ONLY
,
712 "::", APMGR_PORT_STR
);
718 if (!inet_pton(AF_INET6
, APMGR_V6_MCAST_GROUP
, &group
.ipv6mr_multiaddr
.s6_addr
))
719 perror("inet_pton(AF_INET6)");
721 /* Membership has to be added for every interface we listen on. */
722 vlist_for_each_element(&interfaces
, iface
, node
) {
723 group
.ipv6mr_interface
= iface
->ifindex
;
724 if(setsockopt(fd
, IPPROTO_IPV6
, IPV6_ADD_MEMBERSHIP
, (char *)&group
, sizeof group
) < 0)
725 perror("setsockopt(IPV6_ADD_MEMBERSHIP)");
728 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &yes
, sizeof(yes
)) < 0)
729 perror("setsockopt(IPV6_RECVPKTINFO)");
731 if (setsockopt(fd
, SOL_SOCKET
, SO_BROADCAST
, &yes
, sizeof(yes
)) < 0)
732 perror("setsockopt(SO_BROADCAST)");
737 static void usteer_reload_timer(struct uloop_timeout
*t
) {
738 /* Remove uloop descriptor */
739 if (remote_fd
.fd
&& remote_fd
.registered
) {
740 uloop_fd_delete(&remote_fd
);
745 remote_fd
.fd
= usteer_create_v6_socket();
746 remote_fd
.cb
= interface_recv_v6
;
748 remote_fd
.fd
= usteer_create_v4_socket();
749 remote_fd
.cb
= interface_recv_v4
;
752 if (remote_fd
.fd
< 0)
755 uloop_fd_add(&remote_fd
, ULOOP_READ
);
758 int usteer_interface_init(void)
760 if (usteer_init_local_id())
763 remote_timer
.cb
= usteer_send_update_timer
;
764 remote_timer
.cb(&remote_timer
);
766 reload_timer
.cb
= usteer_reload_timer
;
767 reload_timer
.cb(&reload_timer
);