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;
122 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
126 spin_lock_init(&conn->lock);
127 INIT_DELAYED_WORK(&conn->timeout_work, iso_sock_timeout);
129 hcon->iso_data = conn;
133 BT_DBG("hcon %p conn %p", hcon, conn);
138 /* Delete channel. Must be called on the locked socket. */
139 static void iso_chan_del(struct sock *sk, int err)
141 struct iso_conn *conn;
144 conn = iso_pi(sk)->conn;
146 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
151 iso_pi(sk)->conn = NULL;
152 iso_conn_unlock(conn);
155 hci_conn_drop(conn->hcon);
158 sk->sk_state = BT_CLOSED;
161 parent = bt_sk(sk)->parent;
163 bt_accept_unlink(sk);
164 parent->sk_data_ready(parent);
166 sk->sk_state_change(sk);
169 sock_set_flag(sk, SOCK_ZAPPED);
172 static void iso_conn_del(struct hci_conn *hcon, int err)
174 struct iso_conn *conn = hcon->iso_data;
180 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
187 iso_conn_unlock(conn);
191 iso_sock_clear_timer(sk);
192 iso_chan_del(sk, err);
197 /* Ensure no more work items will run before freeing conn. */
198 cancel_delayed_work_sync(&conn->timeout_work);
200 hcon->iso_data = NULL;
204 static int __iso_chan_add(struct iso_conn *conn, struct sock *sk,
207 BT_DBG("conn %p", conn);
209 if (iso_pi(sk)->conn == conn && conn->sk == sk)
213 BT_ERR("conn->sk already set");
217 iso_pi(sk)->conn = conn;
221 bt_accept_enqueue(parent, sk, true);
226 static int iso_chan_add(struct iso_conn *conn, struct sock *sk,
232 err = __iso_chan_add(conn, sk, parent);
233 iso_conn_unlock(conn);
238 static inline u8 le_addr_type(u8 bdaddr_type)
240 if (bdaddr_type == BDADDR_LE_PUBLIC)
241 return ADDR_LE_DEV_PUBLIC;
243 return ADDR_LE_DEV_RANDOM;
246 static int iso_connect_bis(struct sock *sk)
248 struct iso_conn *conn;
249 struct hci_conn *hcon;
250 struct hci_dev *hdev;
253 BT_DBG("%pMR", &iso_pi(sk)->src);
255 hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
256 iso_pi(sk)->src_type);
258 return -EHOSTUNREACH;
262 if (!bis_capable(hdev)) {
267 /* Fail if out PHYs are marked as disabled */
268 if (!iso_pi(sk)->qos.out.phy) {
273 hcon = hci_connect_bis(hdev, &iso_pi(sk)->dst, iso_pi(sk)->dst_type,
274 &iso_pi(sk)->qos, iso_pi(sk)->base_len,
281 conn = iso_conn_add(hcon);
288 hci_dev_unlock(hdev);
291 err = iso_chan_add(conn, sk, NULL);
297 /* Update source addr of the socket */
298 bacpy(&iso_pi(sk)->src, &hcon->src);
300 if (hcon->state == BT_CONNECTED) {
301 iso_sock_clear_timer(sk);
302 sk->sk_state = BT_CONNECTED;
304 sk->sk_state = BT_CONNECT;
305 iso_sock_set_timer(sk, sk->sk_sndtimeo);
312 hci_dev_unlock(hdev);
317 static int iso_connect_cis(struct sock *sk)
319 struct iso_conn *conn;
320 struct hci_conn *hcon;
321 struct hci_dev *hdev;
324 BT_DBG("%pMR -> %pMR", &iso_pi(sk)->src, &iso_pi(sk)->dst);
326 hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
327 iso_pi(sk)->src_type);
329 return -EHOSTUNREACH;
333 if (!cis_central_capable(hdev)) {
338 /* Fail if either PHYs are marked as disabled */
339 if (!iso_pi(sk)->qos.in.phy && !iso_pi(sk)->qos.out.phy) {
344 /* Just bind if DEFER_SETUP has been set */
345 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
346 hcon = hci_bind_cis(hdev, &iso_pi(sk)->dst,
347 le_addr_type(iso_pi(sk)->dst_type),
354 hcon = hci_connect_cis(hdev, &iso_pi(sk)->dst,
355 le_addr_type(iso_pi(sk)->dst_type),
363 conn = iso_conn_add(hcon);
370 hci_dev_unlock(hdev);
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);
397 hci_dev_unlock(hdev);
402 static struct bt_iso_qos *iso_sock_get_qos(struct sock *sk)
404 if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONNECT2)
405 return &iso_pi(sk)->conn->hcon->iso_qos;
407 return &iso_pi(sk)->qos;
410 static int iso_send_frame(struct sock *sk, struct sk_buff *skb)
412 struct iso_conn *conn = iso_pi(sk)->conn;
413 struct bt_iso_qos *qos = iso_sock_get_qos(sk);
414 struct hci_iso_data_hdr *hdr;
417 BT_DBG("sk %p len %d", sk, skb->len);
419 if (skb->len > qos->out.sdu)
424 /* Push ISO data header */
425 hdr = skb_push(skb, HCI_ISO_DATA_HDR_SIZE);
426 hdr->sn = cpu_to_le16(conn->tx_sn++);
427 hdr->slen = cpu_to_le16(hci_iso_data_len_pack(len,
428 HCI_ISO_STATUS_VALID));
430 if (sk->sk_state == BT_CONNECTED)
431 hci_send_iso(conn->hcon, skb);
438 static void iso_recv_frame(struct iso_conn *conn, struct sk_buff *skb)
444 iso_conn_unlock(conn);
449 BT_DBG("sk %p len %d", sk, skb->len);
451 if (sk->sk_state != BT_CONNECTED)
454 if (!sock_queue_rcv_skb(sk, skb))
461 /* -------- Socket interface ---------- */
462 static struct sock *__iso_get_sock_listen_by_addr(bdaddr_t *ba)
466 sk_for_each(sk, &iso_sk_list.head) {
467 if (sk->sk_state != BT_LISTEN)
470 if (!bacmp(&iso_pi(sk)->src, ba))
477 static struct sock *__iso_get_sock_listen_by_sid(bdaddr_t *ba, bdaddr_t *bc,
482 sk_for_each(sk, &iso_sk_list.head) {
483 if (sk->sk_state != BT_LISTEN)
486 if (bacmp(&iso_pi(sk)->src, ba))
489 if (bacmp(&iso_pi(sk)->dst, bc))
492 if (iso_pi(sk)->bc_sid == sid)
499 typedef bool (*iso_sock_match_t)(struct sock *sk, void *data);
501 /* Find socket listening:
502 * source bdaddr (Unicast)
503 * destination bdaddr (Broadcast only)
504 * match func - pass NULL to ignore
505 * match func data - pass -1 to ignore
506 * Returns closest match.
508 static struct sock *iso_get_sock_listen(bdaddr_t *src, bdaddr_t *dst,
509 iso_sock_match_t match, void *data)
511 struct sock *sk = NULL, *sk1 = NULL;
513 read_lock(&iso_sk_list.lock);
515 sk_for_each(sk, &iso_sk_list.head) {
516 if (sk->sk_state != BT_LISTEN)
519 /* Match Broadcast destination */
520 if (bacmp(dst, BDADDR_ANY) && bacmp(&iso_pi(sk)->dst, dst))
523 /* Use Match function if provided */
524 if (match && !match(sk, data))
528 if (!bacmp(&iso_pi(sk)->src, src))
532 if (!bacmp(&iso_pi(sk)->src, BDADDR_ANY))
536 read_unlock(&iso_sk_list.lock);
538 return sk ? sk : sk1;
541 static void iso_sock_destruct(struct sock *sk)
545 skb_queue_purge(&sk->sk_receive_queue);
546 skb_queue_purge(&sk->sk_write_queue);
549 static void iso_sock_cleanup_listen(struct sock *parent)
553 BT_DBG("parent %p", parent);
555 /* Close not yet accepted channels */
556 while ((sk = bt_accept_dequeue(parent, NULL))) {
561 parent->sk_state = BT_CLOSED;
562 sock_set_flag(parent, SOCK_ZAPPED);
565 /* Kill socket (only if zapped and orphan)
566 * Must be called on unlocked socket.
568 static void iso_sock_kill(struct sock *sk)
570 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket ||
571 sock_flag(sk, SOCK_DEAD))
574 BT_DBG("sk %p state %d", sk, sk->sk_state);
576 /* Kill poor orphan */
577 bt_sock_unlink(&iso_sk_list, sk);
578 sock_set_flag(sk, SOCK_DEAD);
582 static void iso_conn_defer_reject(struct hci_conn *conn)
584 struct hci_cp_le_reject_cis cp;
586 BT_DBG("conn %p", conn);
588 memset(&cp, 0, sizeof(cp));
589 cp.handle = cpu_to_le16(conn->handle);
590 cp.reason = HCI_ERROR_REJ_BAD_ADDR;
591 hci_send_cmd(conn->hdev, HCI_OP_LE_REJECT_CIS, sizeof(cp), &cp);
594 static void __iso_sock_close(struct sock *sk)
596 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
598 switch (sk->sk_state) {
600 iso_sock_cleanup_listen(sk);
605 if (iso_pi(sk)->conn->hcon) {
606 sk->sk_state = BT_DISCONN;
607 iso_sock_set_timer(sk, ISO_DISCONN_TIMEOUT);
608 iso_conn_lock(iso_pi(sk)->conn);
609 hci_conn_drop(iso_pi(sk)->conn->hcon);
610 iso_pi(sk)->conn->hcon = NULL;
611 iso_conn_unlock(iso_pi(sk)->conn);
613 iso_chan_del(sk, ECONNRESET);
618 if (iso_pi(sk)->conn->hcon)
619 iso_conn_defer_reject(iso_pi(sk)->conn->hcon);
620 iso_chan_del(sk, ECONNRESET);
623 /* In case of DEFER_SETUP the hcon would be bound to CIG which
624 * needs to be removed so just call hci_conn_del so the cleanup
625 * callback do what is needed.
627 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags) &&
628 iso_pi(sk)->conn->hcon) {
629 hci_conn_del(iso_pi(sk)->conn->hcon);
630 iso_pi(sk)->conn->hcon = NULL;
633 iso_chan_del(sk, ECONNRESET);
636 iso_chan_del(sk, ECONNRESET);
640 sock_set_flag(sk, SOCK_ZAPPED);
645 /* Must be called on unlocked socket. */
646 static void iso_sock_close(struct sock *sk)
648 iso_sock_clear_timer(sk);
650 __iso_sock_close(sk);
655 static void iso_sock_init(struct sock *sk, struct sock *parent)
660 sk->sk_type = parent->sk_type;
661 bt_sk(sk)->flags = bt_sk(parent)->flags;
662 security_sk_clone(parent, sk);
666 static struct proto iso_proto = {
668 .owner = THIS_MODULE,
669 .obj_size = sizeof(struct iso_pinfo)
672 #define DEFAULT_IO_QOS \
674 .interval = 10000u, \
677 .phy = BT_ISO_PHY_2M, \
681 static struct bt_iso_qos default_qos = {
682 .cig = BT_ISO_QOS_CIG_UNSET,
683 .cis = BT_ISO_QOS_CIS_UNSET,
687 .in = DEFAULT_IO_QOS,
688 .out = DEFAULT_IO_QOS,
691 static struct sock *iso_sock_alloc(struct net *net, struct socket *sock,
692 int proto, gfp_t prio, int kern)
696 sk = sk_alloc(net, PF_BLUETOOTH, prio, &iso_proto, kern);
700 sock_init_data(sock, sk);
701 INIT_LIST_HEAD(&bt_sk(sk)->accept_q);
703 sk->sk_destruct = iso_sock_destruct;
704 sk->sk_sndtimeo = ISO_CONN_TIMEOUT;
706 sock_reset_flag(sk, SOCK_ZAPPED);
708 sk->sk_protocol = proto;
709 sk->sk_state = BT_OPEN;
711 /* Set address type as public as default src address is BDADDR_ANY */
712 iso_pi(sk)->src_type = BDADDR_LE_PUBLIC;
714 iso_pi(sk)->qos = default_qos;
716 bt_sock_link(&iso_sk_list, sk);
720 static int iso_sock_create(struct net *net, struct socket *sock, int protocol,
725 BT_DBG("sock %p", sock);
727 sock->state = SS_UNCONNECTED;
729 if (sock->type != SOCK_SEQPACKET)
730 return -ESOCKTNOSUPPORT;
732 sock->ops = &iso_sock_ops;
734 sk = iso_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
738 iso_sock_init(sk, NULL);
742 static int iso_sock_bind_bc(struct socket *sock, struct sockaddr *addr,
745 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
746 struct sock *sk = sock->sk;
749 BT_DBG("sk %p bc_sid %u bc_num_bis %u", sk, sa->iso_bc->bc_sid,
750 sa->iso_bc->bc_num_bis);
752 if (addr_len > sizeof(*sa) + sizeof(*sa->iso_bc) ||
753 sa->iso_bc->bc_num_bis < 0x01 || sa->iso_bc->bc_num_bis > 0x1f)
756 bacpy(&iso_pi(sk)->dst, &sa->iso_bc->bc_bdaddr);
757 iso_pi(sk)->dst_type = sa->iso_bc->bc_bdaddr_type;
758 iso_pi(sk)->sync_handle = -1;
759 iso_pi(sk)->bc_sid = sa->iso_bc->bc_sid;
760 iso_pi(sk)->bc_num_bis = sa->iso_bc->bc_num_bis;
762 for (i = 0; i < iso_pi(sk)->bc_num_bis; i++) {
763 if (sa->iso_bc->bc_bis[i] < 0x01 ||
764 sa->iso_bc->bc_bis[i] > 0x1f)
767 memcpy(iso_pi(sk)->bc_bis, sa->iso_bc->bc_bis,
768 iso_pi(sk)->bc_num_bis);
774 static int iso_sock_bind(struct socket *sock, struct sockaddr *addr,
777 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
778 struct sock *sk = sock->sk;
781 BT_DBG("sk %p %pMR type %u", sk, &sa->iso_bdaddr, sa->iso_bdaddr_type);
783 if (!addr || addr_len < sizeof(struct sockaddr_iso) ||
784 addr->sa_family != AF_BLUETOOTH)
789 if (sk->sk_state != BT_OPEN) {
794 if (sk->sk_type != SOCK_SEQPACKET) {
799 /* Check if the address type is of LE type */
800 if (!bdaddr_type_is_le(sa->iso_bdaddr_type)) {
805 bacpy(&iso_pi(sk)->src, &sa->iso_bdaddr);
806 iso_pi(sk)->src_type = sa->iso_bdaddr_type;
808 /* Check for Broadcast address */
809 if (addr_len > sizeof(*sa)) {
810 err = iso_sock_bind_bc(sock, addr, addr_len);
815 sk->sk_state = BT_BOUND;
822 static int iso_sock_connect(struct socket *sock, struct sockaddr *addr,
825 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
826 struct sock *sk = sock->sk;
831 if (alen < sizeof(struct sockaddr_iso) ||
832 addr->sa_family != AF_BLUETOOTH)
835 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
838 if (sk->sk_type != SOCK_SEQPACKET)
841 /* Check if the address type is of LE type */
842 if (!bdaddr_type_is_le(sa->iso_bdaddr_type))
847 bacpy(&iso_pi(sk)->dst, &sa->iso_bdaddr);
848 iso_pi(sk)->dst_type = sa->iso_bdaddr_type;
852 if (bacmp(&iso_pi(sk)->dst, BDADDR_ANY))
853 err = iso_connect_cis(sk);
855 err = iso_connect_bis(sk);
862 if (!test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
863 err = bt_sock_wait_state(sk, BT_CONNECTED,
864 sock_sndtimeo(sk, flags & O_NONBLOCK));
871 static int iso_listen_bis(struct sock *sk)
873 struct hci_dev *hdev;
876 BT_DBG("%pMR -> %pMR (SID 0x%2.2x)", &iso_pi(sk)->src,
877 &iso_pi(sk)->dst, iso_pi(sk)->bc_sid);
879 write_lock(&iso_sk_list.lock);
881 if (__iso_get_sock_listen_by_sid(&iso_pi(sk)->src, &iso_pi(sk)->dst,
885 write_unlock(&iso_sk_list.lock);
890 hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
891 iso_pi(sk)->src_type);
893 return -EHOSTUNREACH;
897 err = hci_pa_create_sync(hdev, &iso_pi(sk)->dst, iso_pi(sk)->dst_type,
900 hci_dev_unlock(hdev);
906 static int iso_listen_cis(struct sock *sk)
910 BT_DBG("%pMR", &iso_pi(sk)->src);
912 write_lock(&iso_sk_list.lock);
914 if (__iso_get_sock_listen_by_addr(&iso_pi(sk)->src))
917 write_unlock(&iso_sk_list.lock);
922 static int iso_sock_listen(struct socket *sock, int backlog)
924 struct sock *sk = sock->sk;
927 BT_DBG("sk %p backlog %d", sk, backlog);
931 if (sk->sk_state != BT_BOUND) {
936 if (sk->sk_type != SOCK_SEQPACKET) {
941 if (!bacmp(&iso_pi(sk)->dst, BDADDR_ANY))
942 err = iso_listen_cis(sk);
944 err = iso_listen_bis(sk);
949 sk->sk_max_ack_backlog = backlog;
950 sk->sk_ack_backlog = 0;
952 sk->sk_state = BT_LISTEN;
959 static int iso_sock_accept(struct socket *sock, struct socket *newsock,
960 int flags, bool kern)
962 DEFINE_WAIT_FUNC(wait, woken_wake_function);
963 struct sock *sk = sock->sk, *ch;
969 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
971 BT_DBG("sk %p timeo %ld", sk, timeo);
973 /* Wait for an incoming connection. (wake-one). */
974 add_wait_queue_exclusive(sk_sleep(sk), &wait);
976 if (sk->sk_state != BT_LISTEN) {
981 ch = bt_accept_dequeue(sk, newsock);
990 if (signal_pending(current)) {
991 err = sock_intr_errno(timeo);
997 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
1000 remove_wait_queue(sk_sleep(sk), &wait);
1005 newsock->state = SS_CONNECTED;
1007 BT_DBG("new socket %p", ch);
1014 static int iso_sock_getname(struct socket *sock, struct sockaddr *addr,
1017 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
1018 struct sock *sk = sock->sk;
1020 BT_DBG("sock %p, sk %p", sock, sk);
1022 addr->sa_family = AF_BLUETOOTH;
1025 bacpy(&sa->iso_bdaddr, &iso_pi(sk)->dst);
1026 sa->iso_bdaddr_type = iso_pi(sk)->dst_type;
1028 bacpy(&sa->iso_bdaddr, &iso_pi(sk)->src);
1029 sa->iso_bdaddr_type = iso_pi(sk)->src_type;
1032 return sizeof(struct sockaddr_iso);
1035 static int iso_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1038 struct sock *sk = sock->sk;
1039 struct iso_conn *conn = iso_pi(sk)->conn;
1040 struct sk_buff *skb, **frag;
1043 BT_DBG("sock %p, sk %p", sock, sk);
1045 err = sock_error(sk);
1049 if (msg->msg_flags & MSG_OOB)
1052 if (sk->sk_state != BT_CONNECTED)
1055 skb = bt_skb_sendmsg(sk, msg, len, conn->hcon->hdev->iso_mtu,
1056 HCI_ISO_DATA_HDR_SIZE, 0);
1058 return PTR_ERR(skb);
1062 BT_DBG("skb %p len %d", sk, skb->len);
1064 /* Continuation fragments */
1065 frag = &skb_shinfo(skb)->frag_list;
1067 struct sk_buff *tmp;
1069 tmp = bt_skb_sendmsg(sk, msg, len, conn->hcon->hdev->iso_mtu,
1073 return PTR_ERR(tmp);
1080 skb->len += tmp->len;
1081 skb->data_len += tmp->len;
1083 BT_DBG("frag %p len %d", *frag, tmp->len);
1085 frag = &(*frag)->next;
1090 if (sk->sk_state == BT_CONNECTED)
1091 err = iso_send_frame(sk, skb);
1102 static void iso_conn_defer_accept(struct hci_conn *conn)
1104 struct hci_cp_le_accept_cis cp;
1105 struct hci_dev *hdev = conn->hdev;
1107 BT_DBG("conn %p", conn);
1109 conn->state = BT_CONFIG;
1111 cp.handle = cpu_to_le16(conn->handle);
1113 hci_send_cmd(hdev, HCI_OP_LE_ACCEPT_CIS, sizeof(cp), &cp);
1116 static int iso_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1117 size_t len, int flags)
1119 struct sock *sk = sock->sk;
1120 struct iso_pinfo *pi = iso_pi(sk);
1122 BT_DBG("sk %p", sk);
1124 if (test_and_clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
1125 switch (sk->sk_state) {
1128 iso_conn_defer_accept(pi->conn->hcon);
1129 sk->sk_state = BT_CONFIG;
1133 return iso_connect_cis(sk);
1137 return bt_sock_recvmsg(sock, msg, len, flags);
1140 static bool check_io_qos(struct bt_iso_io_qos *qos)
1142 /* If no PHY is enable SDU must be 0 */
1143 if (!qos->phy && qos->sdu)
1146 if (qos->interval && (qos->interval < 0xff || qos->interval > 0xfffff))
1149 if (qos->latency && (qos->latency < 0x05 || qos->latency > 0xfa0))
1152 if (qos->phy > BT_ISO_PHY_ANY)
1158 static bool check_qos(struct bt_iso_qos *qos)
1160 if (qos->sca > 0x07)
1163 if (qos->packing > 0x01)
1166 if (qos->framing > 0x01)
1169 if (!check_io_qos(&qos->in))
1172 if (!check_io_qos(&qos->out))
1178 static int iso_sock_setsockopt(struct socket *sock, int level, int optname,
1179 sockptr_t optval, unsigned int optlen)
1181 struct sock *sk = sock->sk;
1183 struct bt_iso_qos qos;
1186 BT_DBG("sk %p", sk);
1191 case BT_DEFER_SETUP:
1192 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
1197 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
1203 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
1205 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
1209 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
1210 sk->sk_state != BT_CONNECT2) {
1215 len = min_t(unsigned int, sizeof(qos), optlen);
1216 if (len != sizeof(qos)) {
1221 memset(&qos, 0, sizeof(qos));
1223 if (copy_from_sockptr(&qos, optval, len)) {
1228 if (!check_qos(&qos)) {
1233 iso_pi(sk)->qos = qos;
1238 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
1239 sk->sk_state != BT_CONNECT2) {
1244 if (optlen > sizeof(iso_pi(sk)->base)) {
1249 len = min_t(unsigned int, sizeof(iso_pi(sk)->base), optlen);
1251 if (copy_from_sockptr(iso_pi(sk)->base, optval, len)) {
1256 iso_pi(sk)->base_len = len;
1269 static int iso_sock_getsockopt(struct socket *sock, int level, int optname,
1270 char __user *optval, int __user *optlen)
1272 struct sock *sk = sock->sk;
1274 struct bt_iso_qos *qos;
1278 BT_DBG("sk %p", sk);
1280 if (get_user(len, optlen))
1286 case BT_DEFER_SETUP:
1287 if (sk->sk_state == BT_CONNECTED) {
1292 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
1293 (u32 __user *)optval))
1299 qos = iso_sock_get_qos(sk);
1301 len = min_t(unsigned int, len, sizeof(*qos));
1302 if (copy_to_user(optval, qos, len))
1308 if (sk->sk_state == BT_CONNECTED) {
1309 base_len = iso_pi(sk)->conn->hcon->le_per_adv_data_len;
1310 base = iso_pi(sk)->conn->hcon->le_per_adv_data;
1312 base_len = iso_pi(sk)->base_len;
1313 base = iso_pi(sk)->base;
1316 len = min_t(unsigned int, len, base_len);
1317 if (copy_to_user(optval, base, len))
1331 static int iso_sock_shutdown(struct socket *sock, int how)
1333 struct sock *sk = sock->sk;
1336 BT_DBG("sock %p, sk %p, how %d", sock, sk, how);
1346 if (sk->sk_shutdown & RCV_SHUTDOWN)
1348 sk->sk_shutdown |= RCV_SHUTDOWN;
1351 if (sk->sk_shutdown & SEND_SHUTDOWN)
1353 sk->sk_shutdown |= SEND_SHUTDOWN;
1356 if (sk->sk_shutdown & SHUTDOWN_MASK)
1358 sk->sk_shutdown |= SHUTDOWN_MASK;
1362 iso_sock_clear_timer(sk);
1363 __iso_sock_close(sk);
1365 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1366 !(current->flags & PF_EXITING))
1367 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1376 static int iso_sock_release(struct socket *sock)
1378 struct sock *sk = sock->sk;
1381 BT_DBG("sock %p, sk %p", sock, sk);
1388 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1389 !(current->flags & PF_EXITING)) {
1391 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1400 static void iso_sock_ready(struct sock *sk)
1402 BT_DBG("sk %p", sk);
1408 iso_sock_clear_timer(sk);
1409 sk->sk_state = BT_CONNECTED;
1410 sk->sk_state_change(sk);
1414 struct iso_list_data {
1415 struct hci_conn *hcon;
1419 static bool iso_match_big(struct sock *sk, void *data)
1421 struct hci_evt_le_big_sync_estabilished *ev = data;
1423 return ev->handle == iso_pi(sk)->qos.big;
1426 static void iso_conn_ready(struct iso_conn *conn)
1428 struct sock *parent;
1429 struct sock *sk = conn->sk;
1430 struct hci_ev_le_big_sync_estabilished *ev;
1431 struct hci_conn *hcon;
1433 BT_DBG("conn %p", conn);
1436 iso_sock_ready(conn->sk);
1442 ev = hci_recv_event_data(hcon->hdev,
1443 HCI_EVT_LE_BIG_SYNC_ESTABILISHED);
1445 parent = iso_get_sock_listen(&hcon->src,
1449 parent = iso_get_sock_listen(&hcon->src,
1450 BDADDR_ANY, NULL, NULL);
1457 sk = iso_sock_alloc(sock_net(parent), NULL,
1458 BTPROTO_ISO, GFP_ATOMIC, 0);
1460 release_sock(parent);
1464 iso_sock_init(sk, parent);
1466 bacpy(&iso_pi(sk)->src, &hcon->src);
1467 iso_pi(sk)->src_type = hcon->src_type;
1469 /* If hcon has no destination address (BDADDR_ANY) it means it
1470 * was created by HCI_EV_LE_BIG_SYNC_ESTABILISHED so we need to
1471 * initialize using the parent socket destination address.
1473 if (!bacmp(&hcon->dst, BDADDR_ANY)) {
1474 bacpy(&hcon->dst, &iso_pi(parent)->dst);
1475 hcon->dst_type = iso_pi(parent)->dst_type;
1476 hcon->sync_handle = iso_pi(parent)->sync_handle;
1479 bacpy(&iso_pi(sk)->dst, &hcon->dst);
1480 iso_pi(sk)->dst_type = hcon->dst_type;
1482 hci_conn_hold(hcon);
1483 iso_chan_add(conn, sk, parent);
1485 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
1486 sk->sk_state = BT_CONNECT2;
1488 sk->sk_state = BT_CONNECTED;
1490 /* Wake up parent */
1491 parent->sk_data_ready(parent);
1493 release_sock(parent);
1497 static bool iso_match_sid(struct sock *sk, void *data)
1499 struct hci_ev_le_pa_sync_established *ev = data;
1501 return ev->sid == iso_pi(sk)->bc_sid;
1504 static bool iso_match_sync_handle(struct sock *sk, void *data)
1506 struct hci_evt_le_big_info_adv_report *ev = data;
1508 return le16_to_cpu(ev->sync_handle) == iso_pi(sk)->sync_handle;
1511 /* ----- ISO interface with lower layer (HCI) ----- */
1513 int iso_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
1515 struct hci_ev_le_pa_sync_established *ev1;
1516 struct hci_evt_le_big_info_adv_report *ev2;
1520 bt_dev_dbg(hdev, "bdaddr %pMR", bdaddr);
1522 /* Broadcast receiver requires handling of some events before it can
1523 * proceed to establishing a BIG sync:
1525 * 1. HCI_EV_LE_PA_SYNC_ESTABLISHED: The socket may specify a specific
1526 * SID to listen to and once sync is estabilished its handle needs to
1527 * be stored in iso_pi(sk)->sync_handle so it can be matched once
1528 * receiving the BIG Info.
1529 * 2. HCI_EVT_LE_BIG_INFO_ADV_REPORT: When connect_ind is triggered by a
1530 * a BIG Info it attempts to check if there any listening socket with
1531 * the same sync_handle and if it does then attempt to create a sync.
1533 ev1 = hci_recv_event_data(hdev, HCI_EV_LE_PA_SYNC_ESTABLISHED);
1535 sk = iso_get_sock_listen(&hdev->bdaddr, bdaddr, iso_match_sid,
1538 iso_pi(sk)->sync_handle = le16_to_cpu(ev1->handle);
1543 ev2 = hci_recv_event_data(hdev, HCI_EVT_LE_BIG_INFO_ADV_REPORT);
1545 sk = iso_get_sock_listen(&hdev->bdaddr, bdaddr,
1546 iso_match_sync_handle, ev2);
1550 if (ev2->num_bis < iso_pi(sk)->bc_num_bis)
1551 iso_pi(sk)->bc_num_bis = ev2->num_bis;
1553 err = hci_le_big_create_sync(hdev,
1555 iso_pi(sk)->sync_handle,
1556 iso_pi(sk)->bc_num_bis,
1557 iso_pi(sk)->bc_bis);
1559 bt_dev_err(hdev, "hci_le_big_create_sync: %d",
1565 sk = iso_get_sock_listen(&hdev->bdaddr, BDADDR_ANY, NULL, NULL);
1572 lm |= HCI_LM_ACCEPT;
1574 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
1575 *flags |= HCI_PROTO_DEFER;
1580 static void iso_connect_cfm(struct hci_conn *hcon, __u8 status)
1582 if (hcon->type != ISO_LINK) {
1583 if (hcon->type != LE_LINK)
1586 /* Check if LE link has failed */
1589 iso_conn_del(hcon->link, bt_to_errno(status));
1593 /* Create CIS if pending */
1594 hci_le_create_cis(hcon);
1598 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1601 struct iso_conn *conn;
1603 conn = iso_conn_add(hcon);
1605 iso_conn_ready(conn);
1607 iso_conn_del(hcon, bt_to_errno(status));
1611 static void iso_disconn_cfm(struct hci_conn *hcon, __u8 reason)
1613 if (hcon->type != ISO_LINK)
1616 BT_DBG("hcon %p reason %d", hcon, reason);
1618 iso_conn_del(hcon, bt_to_errno(reason));
1621 void iso_recv(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1623 struct iso_conn *conn = hcon->iso_data;
1629 pb = hci_iso_flags_pb(flags);
1630 ts = hci_iso_flags_ts(flags);
1632 BT_DBG("conn %p len %d pb 0x%x ts 0x%x", conn, skb->len, pb, ts);
1638 BT_ERR("Unexpected start frame (len %d)", skb->len);
1639 kfree_skb(conn->rx_skb);
1640 conn->rx_skb = NULL;
1645 struct hci_iso_ts_data_hdr *hdr;
1647 /* TODO: add timestamp to the packet? */
1648 hdr = skb_pull_data(skb, HCI_ISO_TS_DATA_HDR_SIZE);
1650 BT_ERR("Frame is too short (len %d)", skb->len);
1654 len = __le16_to_cpu(hdr->slen);
1656 struct hci_iso_data_hdr *hdr;
1658 hdr = skb_pull_data(skb, HCI_ISO_DATA_HDR_SIZE);
1660 BT_ERR("Frame is too short (len %d)", skb->len);
1664 len = __le16_to_cpu(hdr->slen);
1667 flags = hci_iso_data_flags(len);
1668 len = hci_iso_data_len(len);
1670 BT_DBG("Start: total len %d, frag len %d flags 0x%4.4x", len,
1673 if (len == skb->len) {
1674 /* Complete frame received */
1675 iso_recv_frame(conn, skb);
1679 if (pb == ISO_SINGLE) {
1680 BT_ERR("Frame malformed (len %d, expected len %d)",
1685 if (skb->len > len) {
1686 BT_ERR("Frame is too long (len %d, expected len %d)",
1691 /* Allocate skb for the complete frame (with header) */
1692 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
1696 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
1698 conn->rx_len = len - skb->len;
1702 BT_DBG("Cont: frag len %d (expecting %d)", skb->len,
1705 if (!conn->rx_len) {
1706 BT_ERR("Unexpected continuation frame (len %d)",
1711 if (skb->len > conn->rx_len) {
1712 BT_ERR("Fragment is too long (len %d, expected %d)",
1713 skb->len, conn->rx_len);
1714 kfree_skb(conn->rx_skb);
1715 conn->rx_skb = NULL;
1720 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
1722 conn->rx_len -= skb->len;
1726 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
1728 conn->rx_len -= skb->len;
1730 if (!conn->rx_len) {
1731 struct sk_buff *rx_skb = conn->rx_skb;
1733 /* Complete frame received. iso_recv_frame
1734 * takes ownership of the skb so set the global
1735 * rx_skb pointer to NULL first.
1737 conn->rx_skb = NULL;
1738 iso_recv_frame(conn, rx_skb);
1747 static struct hci_cb iso_cb = {
1749 .connect_cfm = iso_connect_cfm,
1750 .disconn_cfm = iso_disconn_cfm,
1753 static int iso_debugfs_show(struct seq_file *f, void *p)
1757 read_lock(&iso_sk_list.lock);
1759 sk_for_each(sk, &iso_sk_list.head) {
1760 seq_printf(f, "%pMR %pMR %d\n", &iso_pi(sk)->src,
1761 &iso_pi(sk)->dst, sk->sk_state);
1764 read_unlock(&iso_sk_list.lock);
1769 DEFINE_SHOW_ATTRIBUTE(iso_debugfs);
1771 static struct dentry *iso_debugfs;
1773 static const struct proto_ops iso_sock_ops = {
1774 .family = PF_BLUETOOTH,
1775 .owner = THIS_MODULE,
1776 .release = iso_sock_release,
1777 .bind = iso_sock_bind,
1778 .connect = iso_sock_connect,
1779 .listen = iso_sock_listen,
1780 .accept = iso_sock_accept,
1781 .getname = iso_sock_getname,
1782 .sendmsg = iso_sock_sendmsg,
1783 .recvmsg = iso_sock_recvmsg,
1784 .poll = bt_sock_poll,
1785 .ioctl = bt_sock_ioctl,
1786 .mmap = sock_no_mmap,
1787 .socketpair = sock_no_socketpair,
1788 .shutdown = iso_sock_shutdown,
1789 .setsockopt = iso_sock_setsockopt,
1790 .getsockopt = iso_sock_getsockopt
1793 static const struct net_proto_family iso_sock_family_ops = {
1794 .family = PF_BLUETOOTH,
1795 .owner = THIS_MODULE,
1796 .create = iso_sock_create,
1799 static bool iso_inited;
1801 bool iso_enabled(void)
1810 BUILD_BUG_ON(sizeof(struct sockaddr_iso) > sizeof(struct sockaddr));
1815 err = proto_register(&iso_proto, 0);
1819 err = bt_sock_register(BTPROTO_ISO, &iso_sock_family_ops);
1821 BT_ERR("ISO socket registration failed");
1825 err = bt_procfs_init(&init_net, "iso", &iso_sk_list, NULL);
1827 BT_ERR("Failed to create ISO proc file");
1828 bt_sock_unregister(BTPROTO_ISO);
1832 BT_INFO("ISO socket layer initialized");
1834 hci_register_cb(&iso_cb);
1836 if (IS_ERR_OR_NULL(bt_debugfs))
1840 iso_debugfs = debugfs_create_file("iso", 0444, bt_debugfs,
1841 NULL, &iso_debugfs_fops);
1849 proto_unregister(&iso_proto);
1858 bt_procfs_cleanup(&init_net, "iso");
1860 debugfs_remove(iso_debugfs);
1863 hci_unregister_cb(&iso_cb);
1865 bt_sock_unregister(BTPROTO_ISO);
1867 proto_unregister(&iso_proto);