1 // SPDX-License-Identifier: GPL-2.0
3 * BlueZ - Bluetooth protocol stack for Linux
5 * Copyright (C) 2022 Intel Corporation
8 #include <linux/module.h>
9 #include <linux/debugfs.h>
10 #include <linux/seq_file.h>
11 #include <linux/sched/signal.h>
13 #include <net/bluetooth/bluetooth.h>
14 #include <net/bluetooth/hci_core.h>
15 #include <net/bluetooth/iso.h>
17 static const struct proto_ops iso_sock_ops;
19 static struct bt_sock_list iso_sk_list = {
20 .lock = __RW_LOCK_UNLOCKED(iso_sk_list.lock)
23 /* ---- ISO connections ---- */
25 struct hci_conn *hcon;
27 /* @lock: spinlock protecting changes to iso_conn fields */
31 struct delayed_work timeout_work;
33 struct sk_buff *rx_skb;
38 #define iso_conn_lock(c) spin_lock(&(c)->lock)
39 #define iso_conn_unlock(c) spin_unlock(&(c)->lock)
41 static void iso_sock_close(struct sock *sk);
42 static void iso_sock_kill(struct sock *sk);
44 /* ----- ISO socket info ----- */
45 #define iso_pi(sk) ((struct iso_pinfo *)sk)
47 #define EIR_SERVICE_DATA_LENGTH 4
48 #define BASE_MAX_LENGTH (HCI_MAX_PER_AD_LENGTH - EIR_SERVICE_DATA_LENGTH)
58 __u8 bc_bis[ISO_MAX_NUM_BIS];
61 struct bt_iso_qos qos;
63 __u8 base[BASE_MAX_LENGTH];
64 struct iso_conn *conn;
67 /* ---- ISO timers ---- */
68 #define ISO_CONN_TIMEOUT (HZ * 40)
69 #define ISO_DISCONN_TIMEOUT (HZ * 2)
71 static void iso_sock_timeout(struct work_struct *work)
73 struct iso_conn *conn = container_of(work, struct iso_conn,
81 iso_conn_unlock(conn);
86 BT_DBG("sock %p state %d", sk, sk->sk_state);
89 sk->sk_err = ETIMEDOUT;
90 sk->sk_state_change(sk);
95 static void iso_sock_set_timer(struct sock *sk, long timeout)
97 if (!iso_pi(sk)->conn)
100 BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
101 cancel_delayed_work(&iso_pi(sk)->conn->timeout_work);
102 schedule_delayed_work(&iso_pi(sk)->conn->timeout_work, timeout);
105 static void iso_sock_clear_timer(struct sock *sk)
107 if (!iso_pi(sk)->conn)
110 BT_DBG("sock %p state %d", sk, sk->sk_state);
111 cancel_delayed_work(&iso_pi(sk)->conn->timeout_work);
114 /* ---- ISO connections ---- */
115 static struct iso_conn *iso_conn_add(struct hci_conn *hcon)
117 struct iso_conn *conn = hcon->iso_data;
125 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
129 spin_lock_init(&conn->lock);
130 INIT_DELAYED_WORK(&conn->timeout_work, iso_sock_timeout);
132 hcon->iso_data = conn;
136 BT_DBG("hcon %p conn %p", hcon, conn);
141 /* Delete channel. Must be called on the locked socket. */
142 static void iso_chan_del(struct sock *sk, int err)
144 struct iso_conn *conn;
147 conn = iso_pi(sk)->conn;
149 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
154 iso_pi(sk)->conn = NULL;
155 iso_conn_unlock(conn);
158 hci_conn_drop(conn->hcon);
161 sk->sk_state = BT_CLOSED;
164 parent = bt_sk(sk)->parent;
166 bt_accept_unlink(sk);
167 parent->sk_data_ready(parent);
169 sk->sk_state_change(sk);
172 sock_set_flag(sk, SOCK_ZAPPED);
175 static void iso_conn_del(struct hci_conn *hcon, int err)
177 struct iso_conn *conn = hcon->iso_data;
183 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
190 iso_conn_unlock(conn);
194 iso_sock_clear_timer(sk);
195 iso_chan_del(sk, err);
200 /* Ensure no more work items will run before freeing conn. */
201 cancel_delayed_work_sync(&conn->timeout_work);
203 hcon->iso_data = NULL;
207 static int __iso_chan_add(struct iso_conn *conn, struct sock *sk,
210 BT_DBG("conn %p", conn);
212 if (iso_pi(sk)->conn == conn && conn->sk == sk)
216 BT_ERR("conn->sk already set");
220 iso_pi(sk)->conn = conn;
224 bt_accept_enqueue(parent, sk, true);
229 static int iso_chan_add(struct iso_conn *conn, struct sock *sk,
235 err = __iso_chan_add(conn, sk, parent);
236 iso_conn_unlock(conn);
241 static inline u8 le_addr_type(u8 bdaddr_type)
243 if (bdaddr_type == BDADDR_LE_PUBLIC)
244 return ADDR_LE_DEV_PUBLIC;
246 return ADDR_LE_DEV_RANDOM;
249 static int iso_connect_bis(struct sock *sk)
251 struct iso_conn *conn;
252 struct hci_conn *hcon;
253 struct hci_dev *hdev;
256 BT_DBG("%pMR", &iso_pi(sk)->src);
258 hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
259 iso_pi(sk)->src_type);
261 return -EHOSTUNREACH;
265 if (!bis_capable(hdev)) {
270 /* Fail if out PHYs are marked as disabled */
271 if (!iso_pi(sk)->qos.out.phy) {
276 hcon = hci_connect_bis(hdev, &iso_pi(sk)->dst, iso_pi(sk)->dst_type,
277 &iso_pi(sk)->qos, iso_pi(sk)->base_len,
284 conn = iso_conn_add(hcon);
293 err = iso_chan_add(conn, sk, NULL);
299 /* Update source addr of the socket */
300 bacpy(&iso_pi(sk)->src, &hcon->src);
302 if (hcon->state == BT_CONNECTED) {
303 iso_sock_clear_timer(sk);
304 sk->sk_state = BT_CONNECTED;
306 sk->sk_state = BT_CONNECT;
307 iso_sock_set_timer(sk, sk->sk_sndtimeo);
313 hci_dev_unlock(hdev);
318 static int iso_connect_cis(struct sock *sk)
320 struct iso_conn *conn;
321 struct hci_conn *hcon;
322 struct hci_dev *hdev;
325 BT_DBG("%pMR -> %pMR", &iso_pi(sk)->src, &iso_pi(sk)->dst);
327 hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
328 iso_pi(sk)->src_type);
330 return -EHOSTUNREACH;
334 if (!cis_central_capable(hdev)) {
339 /* Fail if either PHYs are marked as disabled */
340 if (!iso_pi(sk)->qos.in.phy && !iso_pi(sk)->qos.out.phy) {
345 /* Just bind if DEFER_SETUP has been set */
346 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
347 hcon = hci_bind_cis(hdev, &iso_pi(sk)->dst,
348 le_addr_type(iso_pi(sk)->dst_type),
355 hcon = hci_connect_cis(hdev, &iso_pi(sk)->dst,
356 le_addr_type(iso_pi(sk)->dst_type),
364 conn = iso_conn_add(hcon);
373 err = iso_chan_add(conn, sk, NULL);
379 /* Update source addr of the socket */
380 bacpy(&iso_pi(sk)->src, &hcon->src);
382 if (hcon->state == BT_CONNECTED) {
383 iso_sock_clear_timer(sk);
384 sk->sk_state = BT_CONNECTED;
385 } else if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
386 iso_sock_clear_timer(sk);
387 sk->sk_state = BT_CONNECT;
389 sk->sk_state = BT_CONNECT;
390 iso_sock_set_timer(sk, sk->sk_sndtimeo);
396 hci_dev_unlock(hdev);
401 static struct bt_iso_qos *iso_sock_get_qos(struct sock *sk)
403 if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONNECT2)
404 return &iso_pi(sk)->conn->hcon->iso_qos;
406 return &iso_pi(sk)->qos;
409 static int iso_send_frame(struct sock *sk, struct sk_buff *skb)
411 struct iso_conn *conn = iso_pi(sk)->conn;
412 struct bt_iso_qos *qos = iso_sock_get_qos(sk);
413 struct hci_iso_data_hdr *hdr;
416 BT_DBG("sk %p len %d", sk, skb->len);
418 if (skb->len > qos->out.sdu)
423 /* Push ISO data header */
424 hdr = skb_push(skb, HCI_ISO_DATA_HDR_SIZE);
425 hdr->sn = cpu_to_le16(conn->tx_sn++);
426 hdr->slen = cpu_to_le16(hci_iso_data_len_pack(len,
427 HCI_ISO_STATUS_VALID));
429 if (sk->sk_state == BT_CONNECTED)
430 hci_send_iso(conn->hcon, skb);
437 static void iso_recv_frame(struct iso_conn *conn, struct sk_buff *skb)
443 iso_conn_unlock(conn);
448 BT_DBG("sk %p len %d", sk, skb->len);
450 if (sk->sk_state != BT_CONNECTED)
453 if (!sock_queue_rcv_skb(sk, skb))
460 /* -------- Socket interface ---------- */
461 static struct sock *__iso_get_sock_listen_by_addr(bdaddr_t *src, bdaddr_t *dst)
465 sk_for_each(sk, &iso_sk_list.head) {
466 if (sk->sk_state != BT_LISTEN)
469 if (bacmp(&iso_pi(sk)->dst, dst))
472 if (!bacmp(&iso_pi(sk)->src, src))
479 static struct sock *__iso_get_sock_listen_by_sid(bdaddr_t *ba, bdaddr_t *bc,
484 sk_for_each(sk, &iso_sk_list.head) {
485 if (sk->sk_state != BT_LISTEN)
488 if (bacmp(&iso_pi(sk)->src, ba))
491 if (bacmp(&iso_pi(sk)->dst, bc))
494 if (iso_pi(sk)->bc_sid == sid)
501 typedef bool (*iso_sock_match_t)(struct sock *sk, void *data);
503 /* Find socket listening:
504 * source bdaddr (Unicast)
505 * destination bdaddr (Broadcast only)
506 * match func - pass NULL to ignore
507 * match func data - pass -1 to ignore
508 * Returns closest match.
510 static struct sock *iso_get_sock_listen(bdaddr_t *src, bdaddr_t *dst,
511 iso_sock_match_t match, void *data)
513 struct sock *sk = NULL, *sk1 = NULL;
515 read_lock(&iso_sk_list.lock);
517 sk_for_each(sk, &iso_sk_list.head) {
518 if (sk->sk_state != BT_LISTEN)
521 /* Match Broadcast destination */
522 if (bacmp(dst, BDADDR_ANY) && bacmp(&iso_pi(sk)->dst, dst))
525 /* Use Match function if provided */
526 if (match && !match(sk, data))
530 if (!bacmp(&iso_pi(sk)->src, src))
534 if (!bacmp(&iso_pi(sk)->src, BDADDR_ANY))
538 read_unlock(&iso_sk_list.lock);
540 return sk ? sk : sk1;
543 static void iso_sock_destruct(struct sock *sk)
547 skb_queue_purge(&sk->sk_receive_queue);
548 skb_queue_purge(&sk->sk_write_queue);
551 static void iso_sock_cleanup_listen(struct sock *parent)
555 BT_DBG("parent %p", parent);
557 /* Close not yet accepted channels */
558 while ((sk = bt_accept_dequeue(parent, NULL))) {
563 parent->sk_state = BT_CLOSED;
564 sock_set_flag(parent, SOCK_ZAPPED);
567 /* Kill socket (only if zapped and orphan)
568 * Must be called on unlocked socket.
570 static void iso_sock_kill(struct sock *sk)
572 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket ||
573 sock_flag(sk, SOCK_DEAD))
576 BT_DBG("sk %p state %d", sk, sk->sk_state);
578 /* Kill poor orphan */
579 bt_sock_unlink(&iso_sk_list, sk);
580 sock_set_flag(sk, SOCK_DEAD);
584 static void iso_conn_defer_reject(struct hci_conn *conn)
586 struct hci_cp_le_reject_cis cp;
588 BT_DBG("conn %p", conn);
590 memset(&cp, 0, sizeof(cp));
591 cp.handle = cpu_to_le16(conn->handle);
592 cp.reason = HCI_ERROR_REJ_BAD_ADDR;
593 hci_send_cmd(conn->hdev, HCI_OP_LE_REJECT_CIS, sizeof(cp), &cp);
596 static void __iso_sock_close(struct sock *sk)
598 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
600 switch (sk->sk_state) {
602 iso_sock_cleanup_listen(sk);
607 if (iso_pi(sk)->conn->hcon) {
608 sk->sk_state = BT_DISCONN;
609 iso_sock_set_timer(sk, ISO_DISCONN_TIMEOUT);
610 iso_conn_lock(iso_pi(sk)->conn);
611 hci_conn_drop(iso_pi(sk)->conn->hcon);
612 iso_pi(sk)->conn->hcon = NULL;
613 iso_conn_unlock(iso_pi(sk)->conn);
615 iso_chan_del(sk, ECONNRESET);
620 if (iso_pi(sk)->conn->hcon)
621 iso_conn_defer_reject(iso_pi(sk)->conn->hcon);
622 iso_chan_del(sk, ECONNRESET);
625 /* In case of DEFER_SETUP the hcon would be bound to CIG which
626 * needs to be removed so just call hci_conn_del so the cleanup
627 * callback do what is needed.
629 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags) &&
630 iso_pi(sk)->conn->hcon) {
631 hci_conn_del(iso_pi(sk)->conn->hcon);
632 iso_pi(sk)->conn->hcon = NULL;
635 iso_chan_del(sk, ECONNRESET);
638 iso_chan_del(sk, ECONNRESET);
642 sock_set_flag(sk, SOCK_ZAPPED);
647 /* Must be called on unlocked socket. */
648 static void iso_sock_close(struct sock *sk)
650 iso_sock_clear_timer(sk);
652 __iso_sock_close(sk);
657 static void iso_sock_init(struct sock *sk, struct sock *parent)
662 sk->sk_type = parent->sk_type;
663 bt_sk(sk)->flags = bt_sk(parent)->flags;
664 security_sk_clone(parent, sk);
668 static struct proto iso_proto = {
670 .owner = THIS_MODULE,
671 .obj_size = sizeof(struct iso_pinfo)
674 #define DEFAULT_IO_QOS \
676 .interval = 10000u, \
679 .phy = BT_ISO_PHY_2M, \
683 static struct bt_iso_qos default_qos = {
684 .cig = BT_ISO_QOS_CIG_UNSET,
685 .cis = BT_ISO_QOS_CIS_UNSET,
689 .in = DEFAULT_IO_QOS,
690 .out = DEFAULT_IO_QOS,
693 static struct sock *iso_sock_alloc(struct net *net, struct socket *sock,
694 int proto, gfp_t prio, int kern)
698 sk = sk_alloc(net, PF_BLUETOOTH, prio, &iso_proto, kern);
702 sock_init_data(sock, sk);
703 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
705 sk->sk_destruct = iso_sock_destruct;
706 sk->sk_sndtimeo = ISO_CONN_TIMEOUT;
708 sock_reset_flag(sk, SOCK_ZAPPED);
710 sk->sk_protocol = proto;
711 sk->sk_state = BT_OPEN;
713 /* Set address type as public as default src address is BDADDR_ANY */
714 iso_pi(sk)->src_type = BDADDR_LE_PUBLIC;
716 iso_pi(sk)->qos = default_qos;
718 bt_sock_link(&iso_sk_list, sk);
722 static int iso_sock_create(struct net *net, struct socket *sock, int protocol,
727 BT_DBG("sock %p", sock);
729 sock->state = SS_UNCONNECTED;
731 if (sock->type != SOCK_SEQPACKET)
732 return -ESOCKTNOSUPPORT;
734 sock->ops = &iso_sock_ops;
736 sk = iso_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
740 iso_sock_init(sk, NULL);
744 static int iso_sock_bind_bc(struct socket *sock, struct sockaddr *addr,
747 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
748 struct sock *sk = sock->sk;
751 BT_DBG("sk %p bc_sid %u bc_num_bis %u", sk, sa->iso_bc->bc_sid,
752 sa->iso_bc->bc_num_bis);
754 if (addr_len > sizeof(*sa) + sizeof(*sa->iso_bc) ||
755 sa->iso_bc->bc_num_bis < 0x01 || sa->iso_bc->bc_num_bis > 0x1f)
758 bacpy(&iso_pi(sk)->dst, &sa->iso_bc->bc_bdaddr);
759 iso_pi(sk)->dst_type = sa->iso_bc->bc_bdaddr_type;
760 iso_pi(sk)->sync_handle = -1;
761 iso_pi(sk)->bc_sid = sa->iso_bc->bc_sid;
762 iso_pi(sk)->bc_num_bis = sa->iso_bc->bc_num_bis;
764 for (i = 0; i < iso_pi(sk)->bc_num_bis; i++) {
765 if (sa->iso_bc->bc_bis[i] < 0x01 ||
766 sa->iso_bc->bc_bis[i] > 0x1f)
769 memcpy(iso_pi(sk)->bc_bis, sa->iso_bc->bc_bis,
770 iso_pi(sk)->bc_num_bis);
776 static int iso_sock_bind(struct socket *sock, struct sockaddr *addr,
779 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
780 struct sock *sk = sock->sk;
783 BT_DBG("sk %p %pMR type %u", sk, &sa->iso_bdaddr, sa->iso_bdaddr_type);
785 if (!addr || addr_len < sizeof(struct sockaddr_iso) ||
786 addr->sa_family != AF_BLUETOOTH)
791 if (sk->sk_state != BT_OPEN) {
796 if (sk->sk_type != SOCK_SEQPACKET) {
801 /* Check if the address type is of LE type */
802 if (!bdaddr_type_is_le(sa->iso_bdaddr_type)) {
807 bacpy(&iso_pi(sk)->src, &sa->iso_bdaddr);
808 iso_pi(sk)->src_type = sa->iso_bdaddr_type;
810 /* Check for Broadcast address */
811 if (addr_len > sizeof(*sa)) {
812 err = iso_sock_bind_bc(sock, addr, addr_len);
817 sk->sk_state = BT_BOUND;
824 static int iso_sock_connect(struct socket *sock, struct sockaddr *addr,
827 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
828 struct sock *sk = sock->sk;
833 if (alen < sizeof(struct sockaddr_iso) ||
834 addr->sa_family != AF_BLUETOOTH)
837 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
840 if (sk->sk_type != SOCK_SEQPACKET)
843 /* Check if the address type is of LE type */
844 if (!bdaddr_type_is_le(sa->iso_bdaddr_type))
849 bacpy(&iso_pi(sk)->dst, &sa->iso_bdaddr);
850 iso_pi(sk)->dst_type = sa->iso_bdaddr_type;
854 if (bacmp(&iso_pi(sk)->dst, BDADDR_ANY))
855 err = iso_connect_cis(sk);
857 err = iso_connect_bis(sk);
864 if (!test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
865 err = bt_sock_wait_state(sk, BT_CONNECTED,
866 sock_sndtimeo(sk, flags & O_NONBLOCK));
873 static int iso_listen_bis(struct sock *sk)
875 struct hci_dev *hdev;
878 BT_DBG("%pMR -> %pMR (SID 0x%2.2x)", &iso_pi(sk)->src,
879 &iso_pi(sk)->dst, iso_pi(sk)->bc_sid);
881 write_lock(&iso_sk_list.lock);
883 if (__iso_get_sock_listen_by_sid(&iso_pi(sk)->src, &iso_pi(sk)->dst,
887 write_unlock(&iso_sk_list.lock);
892 hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
893 iso_pi(sk)->src_type);
895 return -EHOSTUNREACH;
899 err = hci_pa_create_sync(hdev, &iso_pi(sk)->dst, iso_pi(sk)->dst_type,
902 hci_dev_unlock(hdev);
908 static int iso_listen_cis(struct sock *sk)
912 BT_DBG("%pMR", &iso_pi(sk)->src);
914 write_lock(&iso_sk_list.lock);
916 if (__iso_get_sock_listen_by_addr(&iso_pi(sk)->src, &iso_pi(sk)->dst))
919 write_unlock(&iso_sk_list.lock);
924 static int iso_sock_listen(struct socket *sock, int backlog)
926 struct sock *sk = sock->sk;
929 BT_DBG("sk %p backlog %d", sk, backlog);
933 if (sk->sk_state != BT_BOUND) {
938 if (sk->sk_type != SOCK_SEQPACKET) {
943 if (!bacmp(&iso_pi(sk)->dst, BDADDR_ANY))
944 err = iso_listen_cis(sk);
946 err = iso_listen_bis(sk);
951 sk->sk_max_ack_backlog = backlog;
952 sk->sk_ack_backlog = 0;
954 sk->sk_state = BT_LISTEN;
961 static int iso_sock_accept(struct socket *sock, struct socket *newsock,
962 int flags, bool kern)
964 DEFINE_WAIT_FUNC(wait, woken_wake_function);
965 struct sock *sk = sock->sk, *ch;
971 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
973 BT_DBG("sk %p timeo %ld", sk, timeo);
975 /* Wait for an incoming connection. (wake-one). */
976 add_wait_queue_exclusive(sk_sleep(sk), &wait);
978 if (sk->sk_state != BT_LISTEN) {
983 ch = bt_accept_dequeue(sk, newsock);
992 if (signal_pending(current)) {
993 err = sock_intr_errno(timeo);
999 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
1002 remove_wait_queue(sk_sleep(sk), &wait);
1007 newsock->state = SS_CONNECTED;
1009 BT_DBG("new socket %p", ch);
1016 static int iso_sock_getname(struct socket *sock, struct sockaddr *addr,
1019 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
1020 struct sock *sk = sock->sk;
1022 BT_DBG("sock %p, sk %p", sock, sk);
1024 addr->sa_family = AF_BLUETOOTH;
1027 bacpy(&sa->iso_bdaddr, &iso_pi(sk)->dst);
1028 sa->iso_bdaddr_type = iso_pi(sk)->dst_type;
1030 bacpy(&sa->iso_bdaddr, &iso_pi(sk)->src);
1031 sa->iso_bdaddr_type = iso_pi(sk)->src_type;
1034 return sizeof(struct sockaddr_iso);
1037 static int iso_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1040 struct sock *sk = sock->sk;
1041 struct sk_buff *skb, **frag;
1045 BT_DBG("sock %p, sk %p", sock, sk);
1047 err = sock_error(sk);
1051 if (msg->msg_flags & MSG_OOB)
1056 if (sk->sk_state != BT_CONNECTED) {
1061 mtu = iso_pi(sk)->conn->hcon->hdev->iso_mtu;
1065 skb = bt_skb_sendmsg(sk, msg, len, mtu, HCI_ISO_DATA_HDR_SIZE, 0);
1067 return PTR_ERR(skb);
1071 BT_DBG("skb %p len %d", sk, skb->len);
1073 /* Continuation fragments */
1074 frag = &skb_shinfo(skb)->frag_list;
1076 struct sk_buff *tmp;
1078 tmp = bt_skb_sendmsg(sk, msg, len, mtu, 0, 0);
1081 return PTR_ERR(tmp);
1088 skb->len += tmp->len;
1089 skb->data_len += tmp->len;
1091 BT_DBG("frag %p len %d", *frag, tmp->len);
1093 frag = &(*frag)->next;
1098 if (sk->sk_state == BT_CONNECTED)
1099 err = iso_send_frame(sk, skb);
1110 static void iso_conn_defer_accept(struct hci_conn *conn)
1112 struct hci_cp_le_accept_cis cp;
1113 struct hci_dev *hdev = conn->hdev;
1115 BT_DBG("conn %p", conn);
1117 conn->state = BT_CONFIG;
1119 cp.handle = cpu_to_le16(conn->handle);
1121 hci_send_cmd(hdev, HCI_OP_LE_ACCEPT_CIS, sizeof(cp), &cp);
1124 static int iso_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1125 size_t len, int flags)
1127 struct sock *sk = sock->sk;
1128 struct iso_pinfo *pi = iso_pi(sk);
1130 BT_DBG("sk %p", sk);
1132 if (test_and_clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
1134 switch (sk->sk_state) {
1136 iso_conn_defer_accept(pi->conn->hcon);
1137 sk->sk_state = BT_CONFIG;
1142 return iso_connect_cis(sk);
1149 return bt_sock_recvmsg(sock, msg, len, flags);
1152 static bool check_io_qos(struct bt_iso_io_qos *qos)
1154 /* If no PHY is enable SDU must be 0 */
1155 if (!qos->phy && qos->sdu)
1158 if (qos->interval && (qos->interval < 0xff || qos->interval > 0xfffff))
1161 if (qos->latency && (qos->latency < 0x05 || qos->latency > 0xfa0))
1164 if (qos->phy > BT_ISO_PHY_ANY)
1170 static bool check_qos(struct bt_iso_qos *qos)
1172 if (qos->sca > 0x07)
1175 if (qos->packing > 0x01)
1178 if (qos->framing > 0x01)
1181 if (!check_io_qos(&qos->in))
1184 if (!check_io_qos(&qos->out))
1190 static int iso_sock_setsockopt(struct socket *sock, int level, int optname,
1191 sockptr_t optval, unsigned int optlen)
1193 struct sock *sk = sock->sk;
1195 struct bt_iso_qos qos;
1198 BT_DBG("sk %p", sk);
1203 case BT_DEFER_SETUP:
1204 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
1209 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
1215 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
1217 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
1221 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
1222 sk->sk_state != BT_CONNECT2) {
1227 len = min_t(unsigned int, sizeof(qos), optlen);
1228 if (len != sizeof(qos)) {
1233 memset(&qos, 0, sizeof(qos));
1235 if (copy_from_sockptr(&qos, optval, len)) {
1240 if (!check_qos(&qos)) {
1245 iso_pi(sk)->qos = qos;
1250 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
1251 sk->sk_state != BT_CONNECT2) {
1256 if (optlen > sizeof(iso_pi(sk)->base)) {
1261 len = min_t(unsigned int, sizeof(iso_pi(sk)->base), optlen);
1263 if (copy_from_sockptr(iso_pi(sk)->base, optval, len)) {
1268 iso_pi(sk)->base_len = len;
1281 static int iso_sock_getsockopt(struct socket *sock, int level, int optname,
1282 char __user *optval, int __user *optlen)
1284 struct sock *sk = sock->sk;
1286 struct bt_iso_qos *qos;
1290 BT_DBG("sk %p", sk);
1292 if (get_user(len, optlen))
1298 case BT_DEFER_SETUP:
1299 if (sk->sk_state == BT_CONNECTED) {
1304 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
1305 (u32 __user *)optval))
1311 qos = iso_sock_get_qos(sk);
1313 len = min_t(unsigned int, len, sizeof(*qos));
1314 if (copy_to_user(optval, qos, len))
1320 if (sk->sk_state == BT_CONNECTED) {
1321 base_len = iso_pi(sk)->conn->hcon->le_per_adv_data_len;
1322 base = iso_pi(sk)->conn->hcon->le_per_adv_data;
1324 base_len = iso_pi(sk)->base_len;
1325 base = iso_pi(sk)->base;
1328 len = min_t(unsigned int, len, base_len);
1329 if (copy_to_user(optval, base, len))
1343 static int iso_sock_shutdown(struct socket *sock, int how)
1345 struct sock *sk = sock->sk;
1348 BT_DBG("sock %p, sk %p, how %d", sock, sk, how);
1358 if (sk->sk_shutdown & RCV_SHUTDOWN)
1360 sk->sk_shutdown |= RCV_SHUTDOWN;
1363 if (sk->sk_shutdown & SEND_SHUTDOWN)
1365 sk->sk_shutdown |= SEND_SHUTDOWN;
1368 if (sk->sk_shutdown & SHUTDOWN_MASK)
1370 sk->sk_shutdown |= SHUTDOWN_MASK;
1374 iso_sock_clear_timer(sk);
1375 __iso_sock_close(sk);
1377 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1378 !(current->flags & PF_EXITING))
1379 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1388 static int iso_sock_release(struct socket *sock)
1390 struct sock *sk = sock->sk;
1393 BT_DBG("sock %p, sk %p", sock, sk);
1400 if (sock_flag(sk, SOCK_LINGER) && READ_ONCE(sk->sk_lingertime) &&
1401 !(current->flags & PF_EXITING)) {
1403 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1412 static void iso_sock_ready(struct sock *sk)
1414 BT_DBG("sk %p", sk);
1420 iso_sock_clear_timer(sk);
1421 sk->sk_state = BT_CONNECTED;
1422 sk->sk_state_change(sk);
1426 struct iso_list_data {
1427 struct hci_conn *hcon;
1431 static bool iso_match_big(struct sock *sk, void *data)
1433 struct hci_evt_le_big_sync_estabilished *ev = data;
1435 return ev->handle == iso_pi(sk)->qos.big;
1438 static void iso_conn_ready(struct iso_conn *conn)
1440 struct sock *parent;
1441 struct sock *sk = conn->sk;
1442 struct hci_ev_le_big_sync_estabilished *ev;
1443 struct hci_conn *hcon;
1445 BT_DBG("conn %p", conn);
1448 iso_sock_ready(conn->sk);
1454 ev = hci_recv_event_data(hcon->hdev,
1455 HCI_EVT_LE_BIG_SYNC_ESTABILISHED);
1457 parent = iso_get_sock_listen(&hcon->src,
1461 parent = iso_get_sock_listen(&hcon->src,
1462 BDADDR_ANY, NULL, NULL);
1469 sk = iso_sock_alloc(sock_net(parent), NULL,
1470 BTPROTO_ISO, GFP_ATOMIC, 0);
1472 release_sock(parent);
1476 iso_sock_init(sk, parent);
1478 bacpy(&iso_pi(sk)->src, &hcon->src);
1479 iso_pi(sk)->src_type = hcon->src_type;
1481 /* If hcon has no destination address (BDADDR_ANY) it means it
1482 * was created by HCI_EV_LE_BIG_SYNC_ESTABILISHED so we need to
1483 * initialize using the parent socket destination address.
1485 if (!bacmp(&hcon->dst, BDADDR_ANY)) {
1486 bacpy(&hcon->dst, &iso_pi(parent)->dst);
1487 hcon->dst_type = iso_pi(parent)->dst_type;
1488 hcon->sync_handle = iso_pi(parent)->sync_handle;
1491 bacpy(&iso_pi(sk)->dst, &hcon->dst);
1492 iso_pi(sk)->dst_type = hcon->dst_type;
1494 hci_conn_hold(hcon);
1495 iso_chan_add(conn, sk, parent);
1497 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
1498 sk->sk_state = BT_CONNECT2;
1500 sk->sk_state = BT_CONNECTED;
1502 /* Wake up parent */
1503 parent->sk_data_ready(parent);
1505 release_sock(parent);
1509 static bool iso_match_sid(struct sock *sk, void *data)
1511 struct hci_ev_le_pa_sync_established *ev = data;
1513 return ev->sid == iso_pi(sk)->bc_sid;
1516 static bool iso_match_sync_handle(struct sock *sk, void *data)
1518 struct hci_evt_le_big_info_adv_report *ev = data;
1520 return le16_to_cpu(ev->sync_handle) == iso_pi(sk)->sync_handle;
1523 /* ----- ISO interface with lower layer (HCI) ----- */
1525 int iso_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
1527 struct hci_ev_le_pa_sync_established *ev1;
1528 struct hci_evt_le_big_info_adv_report *ev2;
1532 bt_dev_dbg(hdev, "bdaddr %pMR", bdaddr);
1534 /* Broadcast receiver requires handling of some events before it can
1535 * proceed to establishing a BIG sync:
1537 * 1. HCI_EV_LE_PA_SYNC_ESTABLISHED: The socket may specify a specific
1538 * SID to listen to and once sync is estabilished its handle needs to
1539 * be stored in iso_pi(sk)->sync_handle so it can be matched once
1540 * receiving the BIG Info.
1541 * 2. HCI_EVT_LE_BIG_INFO_ADV_REPORT: When connect_ind is triggered by a
1542 * a BIG Info it attempts to check if there any listening socket with
1543 * the same sync_handle and if it does then attempt to create a sync.
1545 ev1 = hci_recv_event_data(hdev, HCI_EV_LE_PA_SYNC_ESTABLISHED);
1547 sk = iso_get_sock_listen(&hdev->bdaddr, bdaddr, iso_match_sid,
1550 iso_pi(sk)->sync_handle = le16_to_cpu(ev1->handle);
1555 ev2 = hci_recv_event_data(hdev, HCI_EVT_LE_BIG_INFO_ADV_REPORT);
1557 sk = iso_get_sock_listen(&hdev->bdaddr, bdaddr,
1558 iso_match_sync_handle, ev2);
1562 if (ev2->num_bis < iso_pi(sk)->bc_num_bis)
1563 iso_pi(sk)->bc_num_bis = ev2->num_bis;
1565 err = hci_le_big_create_sync(hdev,
1567 iso_pi(sk)->sync_handle,
1568 iso_pi(sk)->bc_num_bis,
1569 iso_pi(sk)->bc_bis);
1571 bt_dev_err(hdev, "hci_le_big_create_sync: %d",
1577 sk = iso_get_sock_listen(&hdev->bdaddr, BDADDR_ANY, NULL, NULL);
1584 lm |= HCI_LM_ACCEPT;
1586 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
1587 *flags |= HCI_PROTO_DEFER;
1592 static void iso_connect_cfm(struct hci_conn *hcon, __u8 status)
1594 if (hcon->type != ISO_LINK) {
1595 if (hcon->type != LE_LINK)
1598 /* Check if LE link has failed */
1601 iso_conn_del(hcon->link, bt_to_errno(status));
1605 /* Create CIS if pending */
1606 hci_le_create_cis(hcon);
1610 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1613 struct iso_conn *conn;
1615 conn = iso_conn_add(hcon);
1617 iso_conn_ready(conn);
1619 iso_conn_del(hcon, bt_to_errno(status));
1623 static void iso_disconn_cfm(struct hci_conn *hcon, __u8 reason)
1625 if (hcon->type != ISO_LINK)
1628 BT_DBG("hcon %p reason %d", hcon, reason);
1630 iso_conn_del(hcon, bt_to_errno(reason));
1633 void iso_recv(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1635 struct iso_conn *conn = hcon->iso_data;
1641 pb = hci_iso_flags_pb(flags);
1642 ts = hci_iso_flags_ts(flags);
1644 BT_DBG("conn %p len %d pb 0x%x ts 0x%x", conn, skb->len, pb, ts);
1650 BT_ERR("Unexpected start frame (len %d)", skb->len);
1651 kfree_skb(conn->rx_skb);
1652 conn->rx_skb = NULL;
1657 struct hci_iso_ts_data_hdr *hdr;
1659 /* TODO: add timestamp to the packet? */
1660 hdr = skb_pull_data(skb, HCI_ISO_TS_DATA_HDR_SIZE);
1662 BT_ERR("Frame is too short (len %d)", skb->len);
1666 len = __le16_to_cpu(hdr->slen);
1668 struct hci_iso_data_hdr *hdr;
1670 hdr = skb_pull_data(skb, HCI_ISO_DATA_HDR_SIZE);
1672 BT_ERR("Frame is too short (len %d)", skb->len);
1676 len = __le16_to_cpu(hdr->slen);
1679 flags = hci_iso_data_flags(len);
1680 len = hci_iso_data_len(len);
1682 BT_DBG("Start: total len %d, frag len %d flags 0x%4.4x", len,
1685 if (len == skb->len) {
1686 /* Complete frame received */
1687 iso_recv_frame(conn, skb);
1691 if (pb == ISO_SINGLE) {
1692 BT_ERR("Frame malformed (len %d, expected len %d)",
1697 if (skb->len > len) {
1698 BT_ERR("Frame is too long (len %d, expected len %d)",
1703 /* Allocate skb for the complete frame (with header) */
1704 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
1708 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
1710 conn->rx_len = len - skb->len;
1714 BT_DBG("Cont: frag len %d (expecting %d)", skb->len,
1717 if (!conn->rx_len) {
1718 BT_ERR("Unexpected continuation frame (len %d)",
1723 if (skb->len > conn->rx_len) {
1724 BT_ERR("Fragment is too long (len %d, expected %d)",
1725 skb->len, conn->rx_len);
1726 kfree_skb(conn->rx_skb);
1727 conn->rx_skb = NULL;
1732 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
1734 conn->rx_len -= skb->len;
1738 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
1740 conn->rx_len -= skb->len;
1742 if (!conn->rx_len) {
1743 struct sk_buff *rx_skb = conn->rx_skb;
1745 /* Complete frame received. iso_recv_frame
1746 * takes ownership of the skb so set the global
1747 * rx_skb pointer to NULL first.
1749 conn->rx_skb = NULL;
1750 iso_recv_frame(conn, rx_skb);
1759 static struct hci_cb iso_cb = {
1761 .connect_cfm = iso_connect_cfm,
1762 .disconn_cfm = iso_disconn_cfm,
1765 static int iso_debugfs_show(struct seq_file *f, void *p)
1769 read_lock(&iso_sk_list.lock);
1771 sk_for_each(sk, &iso_sk_list.head) {
1772 seq_printf(f, "%pMR %pMR %d\n", &iso_pi(sk)->src,
1773 &iso_pi(sk)->dst, sk->sk_state);
1776 read_unlock(&iso_sk_list.lock);
1781 DEFINE_SHOW_ATTRIBUTE(iso_debugfs);
1783 static struct dentry *iso_debugfs;
1785 static const struct proto_ops iso_sock_ops = {
1786 .family = PF_BLUETOOTH,
1787 .owner = THIS_MODULE,
1788 .release = iso_sock_release,
1789 .bind = iso_sock_bind,
1790 .connect = iso_sock_connect,
1791 .listen = iso_sock_listen,
1792 .accept = iso_sock_accept,
1793 .getname = iso_sock_getname,
1794 .sendmsg = iso_sock_sendmsg,
1795 .recvmsg = iso_sock_recvmsg,
1796 .poll = bt_sock_poll,
1797 .ioctl = bt_sock_ioctl,
1798 .mmap = sock_no_mmap,
1799 .socketpair = sock_no_socketpair,
1800 .shutdown = iso_sock_shutdown,
1801 .setsockopt = iso_sock_setsockopt,
1802 .getsockopt = iso_sock_getsockopt
1805 static const struct net_proto_family iso_sock_family_ops = {
1806 .family = PF_BLUETOOTH,
1807 .owner = THIS_MODULE,
1808 .create = iso_sock_create,
1811 static bool iso_inited;
1813 bool iso_enabled(void)
1822 BUILD_BUG_ON(sizeof(struct sockaddr_iso) > sizeof(struct sockaddr));
1827 err = proto_register(&iso_proto, 0);
1831 err = bt_sock_register(BTPROTO_ISO, &iso_sock_family_ops);
1833 BT_ERR("ISO socket registration failed");
1837 err = bt_procfs_init(&init_net, "iso", &iso_sk_list, NULL);
1839 BT_ERR("Failed to create ISO proc file");
1840 bt_sock_unregister(BTPROTO_ISO);
1844 BT_INFO("ISO socket layer initialized");
1846 hci_register_cb(&iso_cb);
1848 if (IS_ERR_OR_NULL(bt_debugfs))
1852 iso_debugfs = debugfs_create_file("iso", 0444, bt_debugfs,
1853 NULL, &iso_debugfs_fops);
1861 proto_unregister(&iso_proto);
1870 bt_procfs_cleanup(&init_net, "iso");
1872 debugfs_remove(iso_debugfs);
1875 hci_unregister_cb(&iso_cb);
1877 bt_sock_unregister(BTPROTO_ISO);
1879 proto_unregister(&iso_proto);