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_destination
++;
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
;
261 sprintf(buf
, "%s#%s", host
->addr
, name
);
262 node
->node
.avl
.key
= buf
;
263 node
->name
= buf
+ addr_len
+ 1;
265 INIT_LIST_HEAD(&node
->node
.sta_info
);
267 list_add_tail(&node
->list
, &remote_nodes
);
268 list_add_tail(&node
->host_list
, &host
->nodes
);
274 interface_add_node(struct usteer_remote_host
*host
, struct blob_attr
*data
)
276 struct usteer_remote_node
*node
;
277 struct apmsg_node msg
;
278 struct blob_attr
*cur
;
281 if (!parse_apmsg_node(&msg
, data
)) {
282 MSG(DEBUG
, "Cannot parse node in message\n");
286 node
= interface_get_node(host
, msg
.name
);
288 node
->node
.freq
= msg
.freq
;
289 node
->node
.n_assoc
= msg
.n_assoc
;
290 node
->node
.max_assoc
= msg
.max_assoc
;
291 node
->node
.noise
= msg
.noise
;
292 node
->node
.load
= msg
.load
;
294 memcpy(node
->node
.bssid
, msg
.bssid
, sizeof(node
->node
.bssid
));
296 snprintf(node
->node
.ssid
, sizeof(node
->node
.ssid
), "%s", msg
.ssid
);
297 usteer_node_set_blob(&node
->node
.rrm_nr
, msg
.rrm_nr
);
298 usteer_node_set_blob(&node
->node
.node_info
, msg
.node_info
);
300 blob_for_each_attr(cur
, msg
.stations
, rem
)
301 interface_add_station(node
, cur
);
305 interface_recv_msg(struct interface
*iface
, char *addr_str
, void *buf
, int len
)
307 struct usteer_remote_host
*host
;
308 struct blob_attr
*data
= buf
;
310 struct blob_attr
*cur
;
313 if (blob_pad_len(data
) != len
) {
314 MSG(DEBUG
, "Invalid message length (header: %d, real: %d)\n", blob_pad_len(data
), len
);
318 if (!parse_apmsg(&msg
, data
)) {
319 MSG(DEBUG
, "Missing fields in message\n");
323 if (msg
.id
== local_id
)
326 MSG(NETWORK
, "Received message on %s (id=%08x->%08x seq=%d len=%d)\n",
327 interface_name(iface
), msg
.id
, local_id
, msg
.seq
, len
);
329 host
= interface_get_host(addr_str
, msg
.id
);
330 usteer_node_set_blob(&host
->host_info
, msg
.host_info
);
332 blob_for_each_attr(cur
, msg
.nodes
, rem
)
333 interface_add_node(host
, cur
);
336 static struct interface
*
337 interface_find_by_ifindex(int index
)
339 struct interface
*iface
;
341 vlist_for_each_element(&interfaces
, iface
, node
) {
342 if (iface
->ifindex
== index
)
350 interface_recv_v4(struct uloop_fd
*u
, unsigned int events
)
352 static char buf
[APMGR_BUFLEN
];
353 static char cmsg_buf
[( CMSG_SPACE(sizeof(struct in_pktinfo
)) + sizeof(int)) + 1];
354 static struct sockaddr_in sin
;
355 char addr_str
[INET_ADDRSTRLEN
];
356 static struct iovec iov
= {
358 .iov_len
= sizeof(buf
)
360 static struct msghdr msg
= {
362 .msg_namelen
= sizeof(sin
),
365 .msg_control
= cmsg_buf
,
366 .msg_controllen
= sizeof(cmsg_buf
),
368 struct cmsghdr
*cmsg
;
372 struct in_pktinfo
*pkti
= NULL
;
373 struct interface
*iface
;
375 len
= recvmsg(u
->fd
, &msg
, 0);
389 for (cmsg
= CMSG_FIRSTHDR(&msg
); cmsg
; cmsg
= CMSG_NXTHDR(&msg
, cmsg
)) {
390 if (cmsg
->cmsg_type
!= IP_PKTINFO
)
393 pkti
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
397 MSG(DEBUG
, "Received packet without ifindex\n");
401 iface
= interface_find_by_ifindex(pkti
->ipi_ifindex
);
403 MSG(DEBUG
, "Received packet from unconfigured interface %d\n", pkti
->ipi_ifindex
);
407 inet_ntop(AF_INET
, &sin
.sin_addr
, addr_str
, sizeof(addr_str
));
409 interface_recv_msg(iface
, addr_str
, buf
, len
);
414 static void interface_recv_v6(struct uloop_fd
*u
, unsigned int events
){
415 static char buf
[APMGR_BUFLEN
];
416 static char cmsg_buf
[( CMSG_SPACE(sizeof(struct in6_pktinfo
)) + sizeof(int)) + 1];
417 static struct sockaddr_in6 sin
;
418 static struct iovec iov
= {
420 .iov_len
= sizeof(buf
)
422 static struct msghdr msg
= {
424 .msg_namelen
= sizeof(sin
),
427 .msg_control
= cmsg_buf
,
428 .msg_controllen
= sizeof(cmsg_buf
),
430 struct cmsghdr
*cmsg
;
431 char addr_str
[INET6_ADDRSTRLEN
];
435 struct in6_pktinfo
*pkti
= NULL
;
436 struct interface
*iface
;
438 len
= recvmsg(u
->fd
, &msg
, 0);
452 for (cmsg
= CMSG_FIRSTHDR(&msg
); cmsg
; cmsg
= CMSG_NXTHDR(&msg
, cmsg
)) {
453 if (cmsg
->cmsg_type
!= IPV6_PKTINFO
)
456 pkti
= (struct in6_pktinfo
*) CMSG_DATA(cmsg
);
460 MSG(DEBUG
, "Received packet without ifindex\n");
464 iface
= interface_find_by_ifindex(pkti
->ipi6_ifindex
);
466 MSG(DEBUG
, "Received packet from unconfigured interface %d\n", pkti
->ipi6_ifindex
);
470 inet_ntop(AF_INET6
, &sin
.sin6_addr
, addr_str
, sizeof(addr_str
));
471 if (sin
.sin6_addr
.s6_addr
[0] == 0) {
472 /* IPv4 mapped address. Ignore. */
476 interface_recv_msg(iface
, addr_str
, buf
, len
);
480 static void interface_send_msg_v4(struct interface
*iface
, struct blob_attr
*data
)
482 static size_t cmsg_data
[( CMSG_SPACE(sizeof(struct in_pktinfo
)) / sizeof(size_t)) + 1];
483 static struct sockaddr_in a
;
484 static struct iovec iov
;
485 static struct msghdr m
= {
486 .msg_name
= (struct sockaddr
*) &a
,
487 .msg_namelen
= sizeof(a
),
490 .msg_control
= cmsg_data
,
491 .msg_controllen
= CMSG_LEN(sizeof(struct in_pktinfo
)),
493 struct in_pktinfo
*pkti
;
494 struct cmsghdr
*cmsg
;
496 a
.sin_family
= AF_INET
;
497 a
.sin_port
= htons(APMGR_PORT
);
498 a
.sin_addr
.s_addr
= ~0;
500 memset(cmsg_data
, 0, sizeof(cmsg_data
));
501 cmsg
= CMSG_FIRSTHDR(&m
);
502 cmsg
->cmsg_len
= m
.msg_controllen
;
503 cmsg
->cmsg_level
= IPPROTO_IP
;
504 cmsg
->cmsg_type
= IP_PKTINFO
;
506 pkti
= (struct in_pktinfo
*) CMSG_DATA(cmsg
);
507 pkti
->ipi_ifindex
= iface
->ifindex
;
510 iov
.iov_len
= blob_pad_len(data
);
512 if (sendmsg(remote_fd
.fd
, &m
, 0) < 0)
517 static void interface_send_msg_v6(struct interface
*iface
, struct blob_attr
*data
) {
518 static struct sockaddr_in6 groupSock
= {};
520 groupSock
.sin6_family
= AF_INET6
;
521 inet_pton(AF_INET6
, APMGR_V6_MCAST_GROUP
, &groupSock
.sin6_addr
);
522 groupSock
.sin6_port
= htons(APMGR_PORT
);
524 setsockopt(remote_fd
.fd
, IPPROTO_IPV6
, IPV6_MULTICAST_IF
, &iface
->ifindex
, sizeof(iface
->ifindex
));
526 if (sendto(remote_fd
.fd
, data
, blob_pad_len(data
), 0, (const struct sockaddr
*)&groupSock
, sizeof(groupSock
)) < 0)
530 static void interface_send_msg(struct interface
*iface
, struct blob_attr
*data
){
532 interface_send_msg_v6(iface
, data
);
534 interface_send_msg_v4(iface
, data
);
538 static void usteer_send_sta_info(struct sta_info
*sta
)
540 int seen
= current_time
- sta
->seen
;
541 int last_connected
= !!sta
->connected
? 0 : current_time
- sta
->last_connected
;
544 c
= blob_nest_start(&buf
, 0);
545 blob_put(&buf
, APMSG_STA_ADDR
, sta
->sta
->addr
, 6);
546 blob_put_int8(&buf
, APMSG_STA_CONNECTED
, !!sta
->connected
);
547 blob_put_int32(&buf
, APMSG_STA_SIGNAL
, sta
->signal
);
548 blob_put_int32(&buf
, APMSG_STA_SEEN
, seen
);
549 blob_put_int32(&buf
, APMSG_STA_LAST_CONNECTED
, last_connected
);
550 blob_put_int32(&buf
, APMSG_STA_TIMEOUT
, config
.local_sta_timeout
- seen
);
551 blob_nest_end(&buf
, c
);
554 static void usteer_send_node(struct usteer_node
*node
, struct sta_info
*sta
)
558 c
= blob_nest_start(&buf
, 0);
560 blob_put_string(&buf
, APMSG_NODE_NAME
, usteer_node_name(node
));
561 blob_put_string(&buf
, APMSG_NODE_SSID
, node
->ssid
);
562 blob_put_int32(&buf
, APMSG_NODE_FREQ
, node
->freq
);
563 blob_put_int32(&buf
, APMSG_NODE_NOISE
, node
->noise
);
564 blob_put_int32(&buf
, APMSG_NODE_LOAD
, node
->load
);
565 blob_put_int32(&buf
, APMSG_NODE_N_ASSOC
, node
->n_assoc
);
566 blob_put_int32(&buf
, APMSG_NODE_MAX_ASSOC
, node
->max_assoc
);
567 blob_put(&buf
, APMSG_NODE_BSSID
, node
->bssid
, sizeof(node
->bssid
));
569 r
= blob_nest_start(&buf
, APMSG_NODE_RRM_NR
);
570 blobmsg_add_field(&buf
, BLOBMSG_TYPE_ARRAY
, "",
571 blobmsg_data(node
->rrm_nr
),
572 blobmsg_data_len(node
->rrm_nr
));
573 blob_nest_end(&buf
, r
);
577 blob_put(&buf
, APMSG_NODE_NODE_INFO
,
578 blob_data(node
->node_info
),
579 blob_len(node
->node_info
));
581 s
= blob_nest_start(&buf
, APMSG_NODE_STATIONS
);
584 usteer_send_sta_info(sta
);
586 list_for_each_entry(sta
, &node
->sta_info
, node_list
)
587 usteer_send_sta_info(sta
);
590 blob_nest_end(&buf
, s
);
592 blob_nest_end(&buf
, c
);
596 usteer_check_timeout(void)
598 struct usteer_remote_node
*node
, *tmp
;
599 int timeout
= config
.remote_node_timeout
;
601 list_for_each_entry_safe(node
, tmp
, &remote_nodes
, list
) {
602 if (node
->check
++ > timeout
)
603 remote_node_free(node
);
608 usteer_update_init(void)
610 blob_buf_init(&buf
, 0);
611 blob_put_int32(&buf
, APMSG_ID
, local_id
);
612 blob_put_int32(&buf
, APMSG_SEQ
, ++msg_seq
);
614 blob_put(&buf
, APMSG_HOST_INFO
,
615 blob_data(host_info_blob
),
616 blob_len(host_info_blob
));
618 return blob_nest_start(&buf
, APMSG_NODES
);
622 usteer_update_send(void *c
)
624 struct interface
*iface
;
626 blob_nest_end(&buf
, c
);
628 vlist_for_each_element(&interfaces
, iface
, node
)
629 interface_send_msg(iface
, buf
.head
);
633 usteer_send_sta_update(struct sta_info
*si
)
635 void *c
= usteer_update_init();
636 usteer_send_node(si
->node
, si
);
637 usteer_update_send(c
);
641 usteer_send_update_timer(struct uloop_timeout
*t
)
643 struct usteer_node
*node
;
646 usteer_update_time();
647 uloop_timeout_set(t
, config
.remote_update_interval
);
649 if (!avl_is_empty(&local_nodes
) || host_info_blob
) {
650 c
= usteer_update_init();
651 for_each_local_node(node
)
652 usteer_send_node(node
, NULL
);
654 usteer_update_send(c
);
656 usteer_check_timeout();
660 usteer_init_local_id(void)
664 f
= fopen("/dev/urandom", "r");
666 perror("fopen(/dev/urandom)");
670 if (fread(&local_id
, sizeof(local_id
), 1, f
) < 1)
677 static int usteer_create_v4_socket() {
681 fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
|
682 USOCK_NUMERIC
| USOCK_IPV4ONLY
,
683 "0.0.0.0", APMGR_PORT_STR
);
689 if (setsockopt(fd
, IPPROTO_IP
, IP_PKTINFO
, &yes
, sizeof(yes
)) < 0)
690 perror("setsockopt(IP_PKTINFO)");
692 if (setsockopt(fd
, SOL_SOCKET
, SO_BROADCAST
, &yes
, sizeof(yes
)) < 0)
693 perror("setsockopt(SO_BROADCAST)");
699 static int usteer_create_v6_socket() {
700 struct interface
*iface
;
701 struct ipv6_mreq group
;
705 fd
= usock(USOCK_UDP
| USOCK_SERVER
| USOCK_NONBLOCK
|
706 USOCK_NUMERIC
| USOCK_IPV6ONLY
,
707 "::", APMGR_PORT_STR
);
713 if (!inet_pton(AF_INET6
, APMGR_V6_MCAST_GROUP
, &group
.ipv6mr_multiaddr
.s6_addr
))
714 perror("inet_pton(AF_INET6)");
716 /* Membership has to be added for every interface we listen on. */
717 vlist_for_each_element(&interfaces
, iface
, node
) {
718 group
.ipv6mr_interface
= iface
->ifindex
;
719 if(setsockopt(fd
, IPPROTO_IPV6
, IPV6_ADD_MEMBERSHIP
, (char *)&group
, sizeof group
) < 0)
720 perror("setsockopt(IPV6_ADD_MEMBERSHIP)");
723 if (setsockopt(fd
, IPPROTO_IPV6
, IPV6_RECVPKTINFO
, &yes
, sizeof(yes
)) < 0)
724 perror("setsockopt(IPV6_RECVPKTINFO)");
726 if (setsockopt(fd
, SOL_SOCKET
, SO_BROADCAST
, &yes
, sizeof(yes
)) < 0)
727 perror("setsockopt(SO_BROADCAST)");
732 static void usteer_reload_timer(struct uloop_timeout
*t
) {
733 /* Remove uloop descriptor */
734 if (remote_fd
.fd
&& remote_fd
.registered
) {
735 uloop_fd_delete(&remote_fd
);
740 remote_fd
.fd
= usteer_create_v6_socket();
741 remote_fd
.cb
= interface_recv_v6
;
743 remote_fd
.fd
= usteer_create_v4_socket();
744 remote_fd
.cb
= interface_recv_v4
;
747 if (remote_fd
.fd
< 0)
750 uloop_fd_add(&remote_fd
, ULOOP_READ
);
753 int usteer_interface_init(void)
755 if (usteer_init_local_id())
758 remote_timer
.cb
= usteer_send_update_timer
;
759 remote_timer
.cb(&remote_timer
);
761 reload_timer
.cb
= usteer_reload_timer
;
762 reload_timer
.cb(&reload_timer
);