1 // SPDX-License-Identifier: GPL-2.0
3 * BlueZ - Bluetooth protocol stack for Linux
5 * Copyright (C) 2022 Intel Corporation
9 #include <linux/module.h>
10 #include <linux/debugfs.h>
11 #include <linux/seq_file.h>
12 #include <linux/sched/signal.h>
14 #include <net/bluetooth/bluetooth.h>
15 #include <net/bluetooth/hci_core.h>
16 #include <net/bluetooth/iso.h>
18 static const struct proto_ops iso_sock_ops;
20 static struct bt_sock_list iso_sk_list = {
21 .lock = __RW_LOCK_UNLOCKED(iso_sk_list.lock)
24 /* ---- ISO connections ---- */
26 struct hci_conn *hcon;
28 /* @lock: spinlock protecting changes to iso_conn fields */
32 struct delayed_work timeout_work;
34 struct sk_buff *rx_skb;
39 #define iso_conn_lock(c) spin_lock(&(c)->lock)
40 #define iso_conn_unlock(c) spin_unlock(&(c)->lock)
42 static void iso_sock_close(struct sock *sk);
43 static void iso_sock_kill(struct sock *sk);
45 /* ----- ISO socket info ----- */
46 #define iso_pi(sk) ((struct iso_pinfo *)sk)
48 #define EIR_SERVICE_DATA_LENGTH 4
49 #define BASE_MAX_LENGTH (HCI_MAX_PER_AD_LENGTH - EIR_SERVICE_DATA_LENGTH)
51 /* iso_pinfo flags values */
64 __u8 bc_bis[ISO_MAX_NUM_BIS];
67 struct bt_iso_qos qos;
70 __u8 base[BASE_MAX_LENGTH];
71 struct iso_conn *conn;
74 static struct bt_iso_qos default_qos;
76 static bool check_ucast_qos(struct bt_iso_qos *qos);
77 static bool check_bcast_qos(struct bt_iso_qos *qos);
79 /* ---- ISO timers ---- */
80 #define ISO_CONN_TIMEOUT (HZ * 40)
81 #define ISO_DISCONN_TIMEOUT (HZ * 2)
83 static void iso_sock_timeout(struct work_struct *work)
85 struct iso_conn *conn = container_of(work, struct iso_conn,
93 iso_conn_unlock(conn);
98 BT_DBG("sock %p state %d", sk, sk->sk_state);
101 sk->sk_err = ETIMEDOUT;
102 sk->sk_state_change(sk);
107 static void iso_sock_set_timer(struct sock *sk, long timeout)
109 if (!iso_pi(sk)->conn)
112 BT_DBG("sock %p state %d timeout %ld", sk, sk->sk_state, timeout);
113 cancel_delayed_work(&iso_pi(sk)->conn->timeout_work);
114 schedule_delayed_work(&iso_pi(sk)->conn->timeout_work, timeout);
117 static void iso_sock_clear_timer(struct sock *sk)
119 if (!iso_pi(sk)->conn)
122 BT_DBG("sock %p state %d", sk, sk->sk_state);
123 cancel_delayed_work(&iso_pi(sk)->conn->timeout_work);
126 /* ---- ISO connections ---- */
127 static struct iso_conn *iso_conn_add(struct hci_conn *hcon)
129 struct iso_conn *conn = hcon->iso_data;
137 conn = kzalloc(sizeof(*conn), GFP_KERNEL);
141 spin_lock_init(&conn->lock);
142 INIT_DELAYED_WORK(&conn->timeout_work, iso_sock_timeout);
144 hcon->iso_data = conn;
148 BT_DBG("hcon %p conn %p", hcon, conn);
153 /* Delete channel. Must be called on the locked socket. */
154 static void iso_chan_del(struct sock *sk, int err)
156 struct iso_conn *conn;
159 conn = iso_pi(sk)->conn;
161 BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
166 iso_pi(sk)->conn = NULL;
167 iso_conn_unlock(conn);
170 hci_conn_drop(conn->hcon);
173 sk->sk_state = BT_CLOSED;
176 parent = bt_sk(sk)->parent;
178 bt_accept_unlink(sk);
179 parent->sk_data_ready(parent);
181 sk->sk_state_change(sk);
184 sock_set_flag(sk, SOCK_ZAPPED);
187 static void iso_conn_del(struct hci_conn *hcon, int err)
189 struct iso_conn *conn = hcon->iso_data;
195 BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
202 iso_conn_unlock(conn);
206 iso_sock_clear_timer(sk);
207 iso_chan_del(sk, err);
212 /* Ensure no more work items will run before freeing conn. */
213 cancel_delayed_work_sync(&conn->timeout_work);
215 hcon->iso_data = NULL;
219 static int __iso_chan_add(struct iso_conn *conn, struct sock *sk,
222 BT_DBG("conn %p", conn);
224 if (iso_pi(sk)->conn == conn && conn->sk == sk)
228 BT_ERR("conn->sk already set");
232 iso_pi(sk)->conn = conn;
236 bt_accept_enqueue(parent, sk, true);
241 static int iso_chan_add(struct iso_conn *conn, struct sock *sk,
247 err = __iso_chan_add(conn, sk, parent);
248 iso_conn_unlock(conn);
253 static inline u8 le_addr_type(u8 bdaddr_type)
255 if (bdaddr_type == BDADDR_LE_PUBLIC)
256 return ADDR_LE_DEV_PUBLIC;
258 return ADDR_LE_DEV_RANDOM;
261 static int iso_connect_bis(struct sock *sk)
263 struct iso_conn *conn;
264 struct hci_conn *hcon;
265 struct hci_dev *hdev;
268 BT_DBG("%pMR", &iso_pi(sk)->src);
270 hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
271 iso_pi(sk)->src_type);
273 return -EHOSTUNREACH;
277 if (!bis_capable(hdev)) {
282 /* Fail if user set invalid QoS */
283 if (iso_pi(sk)->qos_user_set && !check_bcast_qos(&iso_pi(sk)->qos)) {
284 iso_pi(sk)->qos = default_qos;
289 /* Fail if out PHYs are marked as disabled */
290 if (!iso_pi(sk)->qos.bcast.out.phy) {
295 /* Just bind if DEFER_SETUP has been set */
296 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
297 hcon = hci_bind_bis(hdev, &iso_pi(sk)->dst,
298 &iso_pi(sk)->qos, iso_pi(sk)->base_len,
305 hcon = hci_connect_bis(hdev, &iso_pi(sk)->dst,
306 le_addr_type(iso_pi(sk)->dst_type),
307 &iso_pi(sk)->qos, iso_pi(sk)->base_len,
315 conn = iso_conn_add(hcon);
324 err = iso_chan_add(conn, sk, NULL);
330 /* Update source addr of the socket */
331 bacpy(&iso_pi(sk)->src, &hcon->src);
333 if (hcon->state == BT_CONNECTED) {
334 iso_sock_clear_timer(sk);
335 sk->sk_state = BT_CONNECTED;
336 } else if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
337 iso_sock_clear_timer(sk);
338 sk->sk_state = BT_CONNECT;
340 sk->sk_state = BT_CONNECT;
341 iso_sock_set_timer(sk, sk->sk_sndtimeo);
347 hci_dev_unlock(hdev);
352 static int iso_connect_cis(struct sock *sk)
354 struct iso_conn *conn;
355 struct hci_conn *hcon;
356 struct hci_dev *hdev;
359 BT_DBG("%pMR -> %pMR", &iso_pi(sk)->src, &iso_pi(sk)->dst);
361 hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
362 iso_pi(sk)->src_type);
364 return -EHOSTUNREACH;
368 if (!cis_central_capable(hdev)) {
373 /* Fail if user set invalid QoS */
374 if (iso_pi(sk)->qos_user_set && !check_ucast_qos(&iso_pi(sk)->qos)) {
375 iso_pi(sk)->qos = default_qos;
380 /* Fail if either PHYs are marked as disabled */
381 if (!iso_pi(sk)->qos.ucast.in.phy && !iso_pi(sk)->qos.ucast.out.phy) {
386 /* Just bind if DEFER_SETUP has been set */
387 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
388 hcon = hci_bind_cis(hdev, &iso_pi(sk)->dst,
389 le_addr_type(iso_pi(sk)->dst_type),
396 hcon = hci_connect_cis(hdev, &iso_pi(sk)->dst,
397 le_addr_type(iso_pi(sk)->dst_type),
405 conn = iso_conn_add(hcon);
414 err = iso_chan_add(conn, sk, NULL);
420 /* Update source addr of the socket */
421 bacpy(&iso_pi(sk)->src, &hcon->src);
423 if (hcon->state == BT_CONNECTED) {
424 iso_sock_clear_timer(sk);
425 sk->sk_state = BT_CONNECTED;
426 } else if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
427 iso_sock_clear_timer(sk);
428 sk->sk_state = BT_CONNECT;
430 sk->sk_state = BT_CONNECT;
431 iso_sock_set_timer(sk, sk->sk_sndtimeo);
437 hci_dev_unlock(hdev);
442 static struct bt_iso_qos *iso_sock_get_qos(struct sock *sk)
444 if (sk->sk_state == BT_CONNECTED || sk->sk_state == BT_CONNECT2)
445 return &iso_pi(sk)->conn->hcon->iso_qos;
447 return &iso_pi(sk)->qos;
450 static int iso_send_frame(struct sock *sk, struct sk_buff *skb)
452 struct iso_conn *conn = iso_pi(sk)->conn;
453 struct bt_iso_qos *qos = iso_sock_get_qos(sk);
454 struct hci_iso_data_hdr *hdr;
457 BT_DBG("sk %p len %d", sk, skb->len);
459 if (skb->len > qos->ucast.out.sdu)
464 /* Push ISO data header */
465 hdr = skb_push(skb, HCI_ISO_DATA_HDR_SIZE);
466 hdr->sn = cpu_to_le16(conn->tx_sn++);
467 hdr->slen = cpu_to_le16(hci_iso_data_len_pack(len,
468 HCI_ISO_STATUS_VALID));
470 if (sk->sk_state == BT_CONNECTED)
471 hci_send_iso(conn->hcon, skb);
478 static void iso_recv_frame(struct iso_conn *conn, struct sk_buff *skb)
484 iso_conn_unlock(conn);
489 BT_DBG("sk %p len %d", sk, skb->len);
491 if (sk->sk_state != BT_CONNECTED)
494 if (!sock_queue_rcv_skb(sk, skb))
501 /* -------- Socket interface ---------- */
502 static struct sock *__iso_get_sock_listen_by_addr(bdaddr_t *ba)
506 sk_for_each(sk, &iso_sk_list.head) {
507 if (sk->sk_state != BT_LISTEN)
510 if (!bacmp(&iso_pi(sk)->src, ba))
517 static struct sock *__iso_get_sock_listen_by_sid(bdaddr_t *ba, bdaddr_t *bc,
522 sk_for_each(sk, &iso_sk_list.head) {
523 if (sk->sk_state != BT_LISTEN)
526 if (bacmp(&iso_pi(sk)->src, ba))
529 if (bacmp(&iso_pi(sk)->dst, bc))
532 if (iso_pi(sk)->bc_sid == sid)
539 typedef bool (*iso_sock_match_t)(struct sock *sk, void *data);
541 /* Find socket listening:
542 * source bdaddr (Unicast)
543 * destination bdaddr (Broadcast only)
544 * match func - pass NULL to ignore
545 * match func data - pass -1 to ignore
546 * Returns closest match.
548 static struct sock *iso_get_sock_listen(bdaddr_t *src, bdaddr_t *dst,
549 iso_sock_match_t match, void *data)
551 struct sock *sk = NULL, *sk1 = NULL;
553 read_lock(&iso_sk_list.lock);
555 sk_for_each(sk, &iso_sk_list.head) {
556 if (sk->sk_state != BT_LISTEN)
559 /* Match Broadcast destination */
560 if (bacmp(dst, BDADDR_ANY) && bacmp(&iso_pi(sk)->dst, dst))
563 /* Use Match function if provided */
564 if (match && !match(sk, data))
568 if (!bacmp(&iso_pi(sk)->src, src))
572 if (!bacmp(&iso_pi(sk)->src, BDADDR_ANY))
576 read_unlock(&iso_sk_list.lock);
578 return sk ? sk : sk1;
581 static void iso_sock_destruct(struct sock *sk)
585 skb_queue_purge(&sk->sk_receive_queue);
586 skb_queue_purge(&sk->sk_write_queue);
589 static void iso_sock_cleanup_listen(struct sock *parent)
593 BT_DBG("parent %p", parent);
595 /* Close not yet accepted channels */
596 while ((sk = bt_accept_dequeue(parent, NULL))) {
601 parent->sk_state = BT_CLOSED;
602 sock_set_flag(parent, SOCK_ZAPPED);
605 /* Kill socket (only if zapped and orphan)
606 * Must be called on unlocked socket.
608 static void iso_sock_kill(struct sock *sk)
610 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket ||
611 sock_flag(sk, SOCK_DEAD))
614 BT_DBG("sk %p state %d", sk, sk->sk_state);
616 /* Kill poor orphan */
617 bt_sock_unlink(&iso_sk_list, sk);
618 sock_set_flag(sk, SOCK_DEAD);
622 static void __iso_sock_close(struct sock *sk)
624 BT_DBG("sk %p state %d socket %p", sk, sk->sk_state, sk->sk_socket);
626 switch (sk->sk_state) {
628 iso_sock_cleanup_listen(sk);
634 if (iso_pi(sk)->conn->hcon) {
635 sk->sk_state = BT_DISCONN;
636 iso_sock_set_timer(sk, ISO_DISCONN_TIMEOUT);
637 iso_conn_lock(iso_pi(sk)->conn);
638 hci_conn_drop(iso_pi(sk)->conn->hcon);
639 iso_pi(sk)->conn->hcon = NULL;
640 iso_conn_unlock(iso_pi(sk)->conn);
642 iso_chan_del(sk, ECONNRESET);
647 iso_chan_del(sk, ECONNRESET);
650 iso_chan_del(sk, ECONNRESET);
654 sock_set_flag(sk, SOCK_ZAPPED);
659 /* Must be called on unlocked socket. */
660 static void iso_sock_close(struct sock *sk)
662 iso_sock_clear_timer(sk);
664 __iso_sock_close(sk);
669 static void iso_sock_init(struct sock *sk, struct sock *parent)
674 sk->sk_type = parent->sk_type;
675 bt_sk(sk)->flags = bt_sk(parent)->flags;
676 security_sk_clone(parent, sk);
680 static struct proto iso_proto = {
682 .owner = THIS_MODULE,
683 .obj_size = sizeof(struct iso_pinfo)
686 #define DEFAULT_IO_QOS \
688 .interval = 10000u, \
691 .phy = BT_ISO_PHY_2M, \
695 static struct bt_iso_qos default_qos = {
697 .big = BT_ISO_QOS_BIG_UNSET,
698 .bis = BT_ISO_QOS_BIS_UNSET,
702 .in = DEFAULT_IO_QOS,
703 .out = DEFAULT_IO_QOS,
708 .sync_timeout = 0x4000,
709 .sync_cte_type = 0x00,
715 static struct sock *iso_sock_alloc(struct net *net, struct socket *sock,
716 int proto, gfp_t prio, int kern)
720 sk = bt_sock_alloc(net, sock, &iso_proto, proto, prio, kern);
724 sk->sk_destruct = iso_sock_destruct;
725 sk->sk_sndtimeo = ISO_CONN_TIMEOUT;
727 /* Set address type as public as default src address is BDADDR_ANY */
728 iso_pi(sk)->src_type = BDADDR_LE_PUBLIC;
730 iso_pi(sk)->qos = default_qos;
732 bt_sock_link(&iso_sk_list, sk);
736 static int iso_sock_create(struct net *net, struct socket *sock, int protocol,
741 BT_DBG("sock %p", sock);
743 sock->state = SS_UNCONNECTED;
745 if (sock->type != SOCK_SEQPACKET)
746 return -ESOCKTNOSUPPORT;
748 sock->ops = &iso_sock_ops;
750 sk = iso_sock_alloc(net, sock, protocol, GFP_ATOMIC, kern);
754 iso_sock_init(sk, NULL);
758 static int iso_sock_bind_bc(struct socket *sock, struct sockaddr *addr,
761 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
762 struct sock *sk = sock->sk;
765 BT_DBG("sk %p bc_sid %u bc_num_bis %u", sk, sa->iso_bc->bc_sid,
766 sa->iso_bc->bc_num_bis);
768 if (addr_len > sizeof(*sa) + sizeof(*sa->iso_bc) ||
769 sa->iso_bc->bc_num_bis < 0x01 || sa->iso_bc->bc_num_bis > 0x1f)
772 bacpy(&iso_pi(sk)->dst, &sa->iso_bc->bc_bdaddr);
773 iso_pi(sk)->dst_type = sa->iso_bc->bc_bdaddr_type;
774 iso_pi(sk)->sync_handle = -1;
775 iso_pi(sk)->bc_sid = sa->iso_bc->bc_sid;
776 iso_pi(sk)->bc_num_bis = sa->iso_bc->bc_num_bis;
778 for (i = 0; i < iso_pi(sk)->bc_num_bis; i++) {
779 if (sa->iso_bc->bc_bis[i] < 0x01 ||
780 sa->iso_bc->bc_bis[i] > 0x1f)
783 memcpy(iso_pi(sk)->bc_bis, sa->iso_bc->bc_bis,
784 iso_pi(sk)->bc_num_bis);
790 static int iso_sock_bind(struct socket *sock, struct sockaddr *addr,
793 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
794 struct sock *sk = sock->sk;
797 BT_DBG("sk %p %pMR type %u", sk, &sa->iso_bdaddr, sa->iso_bdaddr_type);
799 if (!addr || addr_len < sizeof(struct sockaddr_iso) ||
800 addr->sa_family != AF_BLUETOOTH)
805 if (sk->sk_state != BT_OPEN) {
810 if (sk->sk_type != SOCK_SEQPACKET) {
815 /* Check if the address type is of LE type */
816 if (!bdaddr_type_is_le(sa->iso_bdaddr_type)) {
821 bacpy(&iso_pi(sk)->src, &sa->iso_bdaddr);
822 iso_pi(sk)->src_type = sa->iso_bdaddr_type;
824 /* Check for Broadcast address */
825 if (addr_len > sizeof(*sa)) {
826 err = iso_sock_bind_bc(sock, addr, addr_len);
831 sk->sk_state = BT_BOUND;
838 static int iso_sock_connect(struct socket *sock, struct sockaddr *addr,
841 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
842 struct sock *sk = sock->sk;
847 if (alen < sizeof(struct sockaddr_iso) ||
848 addr->sa_family != AF_BLUETOOTH)
851 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND)
854 if (sk->sk_type != SOCK_SEQPACKET)
857 /* Check if the address type is of LE type */
858 if (!bdaddr_type_is_le(sa->iso_bdaddr_type))
863 bacpy(&iso_pi(sk)->dst, &sa->iso_bdaddr);
864 iso_pi(sk)->dst_type = sa->iso_bdaddr_type;
868 if (bacmp(&iso_pi(sk)->dst, BDADDR_ANY))
869 err = iso_connect_cis(sk);
871 err = iso_connect_bis(sk);
878 if (!test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
879 err = bt_sock_wait_state(sk, BT_CONNECTED,
880 sock_sndtimeo(sk, flags & O_NONBLOCK));
887 static int iso_listen_bis(struct sock *sk)
889 struct hci_dev *hdev;
892 BT_DBG("%pMR -> %pMR (SID 0x%2.2x)", &iso_pi(sk)->src,
893 &iso_pi(sk)->dst, iso_pi(sk)->bc_sid);
895 write_lock(&iso_sk_list.lock);
897 if (__iso_get_sock_listen_by_sid(&iso_pi(sk)->src, &iso_pi(sk)->dst,
901 write_unlock(&iso_sk_list.lock);
906 hdev = hci_get_route(&iso_pi(sk)->dst, &iso_pi(sk)->src,
907 iso_pi(sk)->src_type);
909 return -EHOSTUNREACH;
911 /* Fail if user set invalid QoS */
912 if (iso_pi(sk)->qos_user_set && !check_bcast_qos(&iso_pi(sk)->qos)) {
913 iso_pi(sk)->qos = default_qos;
917 err = hci_pa_create_sync(hdev, &iso_pi(sk)->dst,
918 le_addr_type(iso_pi(sk)->dst_type),
919 iso_pi(sk)->bc_sid, &iso_pi(sk)->qos);
926 static int iso_listen_cis(struct sock *sk)
930 BT_DBG("%pMR", &iso_pi(sk)->src);
932 write_lock(&iso_sk_list.lock);
934 if (__iso_get_sock_listen_by_addr(&iso_pi(sk)->src))
937 write_unlock(&iso_sk_list.lock);
942 static int iso_sock_listen(struct socket *sock, int backlog)
944 struct sock *sk = sock->sk;
947 BT_DBG("sk %p backlog %d", sk, backlog);
951 if (sk->sk_state != BT_BOUND) {
956 if (sk->sk_type != SOCK_SEQPACKET) {
961 if (!bacmp(&iso_pi(sk)->dst, BDADDR_ANY))
962 err = iso_listen_cis(sk);
964 err = iso_listen_bis(sk);
969 sk->sk_max_ack_backlog = backlog;
970 sk->sk_ack_backlog = 0;
972 sk->sk_state = BT_LISTEN;
979 static int iso_sock_accept(struct socket *sock, struct socket *newsock,
980 int flags, bool kern)
982 DEFINE_WAIT_FUNC(wait, woken_wake_function);
983 struct sock *sk = sock->sk, *ch;
989 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
991 BT_DBG("sk %p timeo %ld", sk, timeo);
993 /* Wait for an incoming connection. (wake-one). */
994 add_wait_queue_exclusive(sk_sleep(sk), &wait);
996 if (sk->sk_state != BT_LISTEN) {
1001 ch = bt_accept_dequeue(sk, newsock);
1010 if (signal_pending(current)) {
1011 err = sock_intr_errno(timeo);
1017 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
1020 remove_wait_queue(sk_sleep(sk), &wait);
1025 newsock->state = SS_CONNECTED;
1027 BT_DBG("new socket %p", ch);
1034 static int iso_sock_getname(struct socket *sock, struct sockaddr *addr,
1037 struct sockaddr_iso *sa = (struct sockaddr_iso *)addr;
1038 struct sock *sk = sock->sk;
1040 BT_DBG("sock %p, sk %p", sock, sk);
1042 addr->sa_family = AF_BLUETOOTH;
1045 bacpy(&sa->iso_bdaddr, &iso_pi(sk)->dst);
1046 sa->iso_bdaddr_type = iso_pi(sk)->dst_type;
1048 bacpy(&sa->iso_bdaddr, &iso_pi(sk)->src);
1049 sa->iso_bdaddr_type = iso_pi(sk)->src_type;
1052 return sizeof(struct sockaddr_iso);
1055 static int iso_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1058 struct sock *sk = sock->sk;
1059 struct sk_buff *skb, **frag;
1063 BT_DBG("sock %p, sk %p", sock, sk);
1065 err = sock_error(sk);
1069 if (msg->msg_flags & MSG_OOB)
1074 if (sk->sk_state != BT_CONNECTED) {
1079 mtu = iso_pi(sk)->conn->hcon->hdev->iso_mtu;
1083 skb = bt_skb_sendmsg(sk, msg, len, mtu, HCI_ISO_DATA_HDR_SIZE, 0);
1085 return PTR_ERR(skb);
1089 BT_DBG("skb %p len %d", sk, skb->len);
1091 /* Continuation fragments */
1092 frag = &skb_shinfo(skb)->frag_list;
1094 struct sk_buff *tmp;
1096 tmp = bt_skb_sendmsg(sk, msg, len, mtu, 0, 0);
1099 return PTR_ERR(tmp);
1106 skb->len += tmp->len;
1107 skb->data_len += tmp->len;
1109 BT_DBG("frag %p len %d", *frag, tmp->len);
1111 frag = &(*frag)->next;
1116 if (sk->sk_state == BT_CONNECTED)
1117 err = iso_send_frame(sk, skb);
1128 static void iso_conn_defer_accept(struct hci_conn *conn)
1130 struct hci_cp_le_accept_cis cp;
1131 struct hci_dev *hdev = conn->hdev;
1133 BT_DBG("conn %p", conn);
1135 conn->state = BT_CONFIG;
1137 cp.handle = cpu_to_le16(conn->handle);
1139 hci_send_cmd(hdev, HCI_OP_LE_ACCEPT_CIS, sizeof(cp), &cp);
1142 static int iso_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1143 size_t len, int flags)
1145 struct sock *sk = sock->sk;
1146 struct iso_pinfo *pi = iso_pi(sk);
1148 BT_DBG("sk %p", sk);
1150 if (test_and_clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags)) {
1152 switch (sk->sk_state) {
1154 iso_conn_defer_accept(pi->conn->hcon);
1155 sk->sk_state = BT_CONFIG;
1160 return iso_connect_cis(sk);
1167 return bt_sock_recvmsg(sock, msg, len, flags);
1170 static bool check_io_qos(struct bt_iso_io_qos *qos)
1172 /* If no PHY is enable SDU must be 0 */
1173 if (!qos->phy && qos->sdu)
1176 if (qos->interval && (qos->interval < 0xff || qos->interval > 0xfffff))
1179 if (qos->latency && (qos->latency < 0x05 || qos->latency > 0xfa0))
1182 if (qos->phy > BT_ISO_PHY_ANY)
1188 static bool check_ucast_qos(struct bt_iso_qos *qos)
1190 if (qos->ucast.cig > 0xef && qos->ucast.cig != BT_ISO_QOS_CIG_UNSET)
1193 if (qos->ucast.cis > 0xef && qos->ucast.cis != BT_ISO_QOS_CIS_UNSET)
1196 if (qos->ucast.sca > 0x07)
1199 if (qos->ucast.packing > 0x01)
1202 if (qos->ucast.framing > 0x01)
1205 if (!check_io_qos(&qos->ucast.in))
1208 if (!check_io_qos(&qos->ucast.out))
1214 static bool check_bcast_qos(struct bt_iso_qos *qos)
1216 if (qos->bcast.sync_factor == 0x00)
1219 if (qos->bcast.packing > 0x01)
1222 if (qos->bcast.framing > 0x01)
1225 if (!check_io_qos(&qos->bcast.in))
1228 if (!check_io_qos(&qos->bcast.out))
1231 if (qos->bcast.encryption > 0x01)
1234 if (qos->bcast.options > 0x07)
1237 if (qos->bcast.skip > 0x01f3)
1240 if (qos->bcast.sync_timeout < 0x000a || qos->bcast.sync_timeout > 0x4000)
1243 if (qos->bcast.sync_cte_type > 0x1f)
1246 if (qos->bcast.mse > 0x1f)
1249 if (qos->bcast.timeout < 0x000a || qos->bcast.timeout > 0x4000)
1255 static int iso_sock_setsockopt(struct socket *sock, int level, int optname,
1256 sockptr_t optval, unsigned int optlen)
1258 struct sock *sk = sock->sk;
1260 struct bt_iso_qos qos = default_qos;
1263 BT_DBG("sk %p", sk);
1268 case BT_DEFER_SETUP:
1269 if (sk->sk_state != BT_BOUND && sk->sk_state != BT_LISTEN) {
1274 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
1280 set_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
1282 clear_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags);
1286 if (copy_from_sockptr(&opt, optval, sizeof(u32))) {
1292 set_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags);
1294 clear_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags);
1298 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
1299 sk->sk_state != BT_CONNECT2) {
1304 len = min_t(unsigned int, sizeof(qos), optlen);
1306 if (copy_from_sockptr(&qos, optval, len)) {
1311 if (len == sizeof(qos.ucast) && !check_ucast_qos(&qos)) {
1316 iso_pi(sk)->qos = qos;
1317 iso_pi(sk)->qos_user_set = true;
1322 if (sk->sk_state != BT_OPEN && sk->sk_state != BT_BOUND &&
1323 sk->sk_state != BT_CONNECT2) {
1328 if (optlen > sizeof(iso_pi(sk)->base)) {
1333 len = min_t(unsigned int, sizeof(iso_pi(sk)->base), optlen);
1335 if (copy_from_sockptr(iso_pi(sk)->base, optval, len)) {
1340 iso_pi(sk)->base_len = len;
1353 static int iso_sock_getsockopt(struct socket *sock, int level, int optname,
1354 char __user *optval, int __user *optlen)
1356 struct sock *sk = sock->sk;
1358 struct bt_iso_qos *qos;
1362 BT_DBG("sk %p", sk);
1364 if (get_user(len, optlen))
1370 case BT_DEFER_SETUP:
1371 if (sk->sk_state == BT_CONNECTED) {
1376 if (put_user(test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags),
1377 (u32 __user *)optval))
1383 if (put_user(test_bit(BT_SK_PKT_STATUS, &bt_sk(sk)->flags),
1384 (int __user *)optval))
1389 qos = iso_sock_get_qos(sk);
1391 len = min_t(unsigned int, len, sizeof(*qos));
1392 if (copy_to_user(optval, qos, len))
1398 if (sk->sk_state == BT_CONNECTED) {
1399 base_len = iso_pi(sk)->conn->hcon->le_per_adv_data_len;
1400 base = iso_pi(sk)->conn->hcon->le_per_adv_data;
1402 base_len = iso_pi(sk)->base_len;
1403 base = iso_pi(sk)->base;
1406 len = min_t(unsigned int, len, base_len);
1407 if (copy_to_user(optval, base, len))
1421 static int iso_sock_shutdown(struct socket *sock, int how)
1423 struct sock *sk = sock->sk;
1426 BT_DBG("sock %p, sk %p, how %d", sock, sk, how);
1436 if (sk->sk_shutdown & RCV_SHUTDOWN)
1438 sk->sk_shutdown |= RCV_SHUTDOWN;
1441 if (sk->sk_shutdown & SEND_SHUTDOWN)
1443 sk->sk_shutdown |= SEND_SHUTDOWN;
1446 if (sk->sk_shutdown & SHUTDOWN_MASK)
1448 sk->sk_shutdown |= SHUTDOWN_MASK;
1452 iso_sock_clear_timer(sk);
1453 __iso_sock_close(sk);
1455 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1456 !(current->flags & PF_EXITING))
1457 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1466 static int iso_sock_release(struct socket *sock)
1468 struct sock *sk = sock->sk;
1471 BT_DBG("sock %p, sk %p", sock, sk);
1478 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
1479 !(current->flags & PF_EXITING)) {
1481 err = bt_sock_wait_state(sk, BT_CLOSED, sk->sk_lingertime);
1490 static void iso_sock_ready(struct sock *sk)
1492 BT_DBG("sk %p", sk);
1498 iso_sock_clear_timer(sk);
1499 sk->sk_state = BT_CONNECTED;
1500 sk->sk_state_change(sk);
1504 struct iso_list_data {
1505 struct hci_conn *hcon;
1509 static bool iso_match_big(struct sock *sk, void *data)
1511 struct hci_evt_le_big_sync_estabilished *ev = data;
1513 return ev->handle == iso_pi(sk)->qos.bcast.big;
1516 static void iso_conn_ready(struct iso_conn *conn)
1518 struct sock *parent;
1519 struct sock *sk = conn->sk;
1520 struct hci_ev_le_big_sync_estabilished *ev;
1521 struct hci_conn *hcon;
1523 BT_DBG("conn %p", conn);
1526 iso_sock_ready(conn->sk);
1532 ev = hci_recv_event_data(hcon->hdev,
1533 HCI_EVT_LE_BIG_SYNC_ESTABILISHED);
1535 parent = iso_get_sock_listen(&hcon->src,
1539 parent = iso_get_sock_listen(&hcon->src,
1540 BDADDR_ANY, NULL, NULL);
1547 sk = iso_sock_alloc(sock_net(parent), NULL,
1548 BTPROTO_ISO, GFP_ATOMIC, 0);
1550 release_sock(parent);
1554 iso_sock_init(sk, parent);
1556 bacpy(&iso_pi(sk)->src, &hcon->src);
1557 iso_pi(sk)->src_type = hcon->src_type;
1559 /* If hcon has no destination address (BDADDR_ANY) it means it
1560 * was created by HCI_EV_LE_BIG_SYNC_ESTABILISHED so we need to
1561 * initialize using the parent socket destination address.
1563 if (!bacmp(&hcon->dst, BDADDR_ANY)) {
1564 bacpy(&hcon->dst, &iso_pi(parent)->dst);
1565 hcon->dst_type = iso_pi(parent)->dst_type;
1566 hcon->sync_handle = iso_pi(parent)->sync_handle;
1569 bacpy(&iso_pi(sk)->dst, &hcon->dst);
1570 iso_pi(sk)->dst_type = hcon->dst_type;
1572 hci_conn_hold(hcon);
1573 iso_chan_add(conn, sk, parent);
1575 if (ev && ((struct hci_evt_le_big_sync_estabilished *)ev)->status) {
1576 /* Trigger error signal on child socket */
1577 sk->sk_err = ECONNREFUSED;
1578 sk->sk_error_report(sk);
1581 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
1582 sk->sk_state = BT_CONNECT2;
1584 sk->sk_state = BT_CONNECTED;
1586 /* Wake up parent */
1587 parent->sk_data_ready(parent);
1589 release_sock(parent);
1593 static bool iso_match_sid(struct sock *sk, void *data)
1595 struct hci_ev_le_pa_sync_established *ev = data;
1597 return ev->sid == iso_pi(sk)->bc_sid;
1600 static bool iso_match_sync_handle(struct sock *sk, void *data)
1602 struct hci_evt_le_big_info_adv_report *ev = data;
1604 return le16_to_cpu(ev->sync_handle) == iso_pi(sk)->sync_handle;
1607 /* ----- ISO interface with lower layer (HCI) ----- */
1609 int iso_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, __u8 *flags)
1611 struct hci_ev_le_pa_sync_established *ev1;
1612 struct hci_evt_le_big_info_adv_report *ev2;
1616 bt_dev_dbg(hdev, "bdaddr %pMR", bdaddr);
1618 /* Broadcast receiver requires handling of some events before it can
1619 * proceed to establishing a BIG sync:
1621 * 1. HCI_EV_LE_PA_SYNC_ESTABLISHED: The socket may specify a specific
1622 * SID to listen to and once sync is estabilished its handle needs to
1623 * be stored in iso_pi(sk)->sync_handle so it can be matched once
1624 * receiving the BIG Info.
1625 * 2. HCI_EVT_LE_BIG_INFO_ADV_REPORT: When connect_ind is triggered by a
1626 * a BIG Info it attempts to check if there any listening socket with
1627 * the same sync_handle and if it does then attempt to create a sync.
1629 ev1 = hci_recv_event_data(hdev, HCI_EV_LE_PA_SYNC_ESTABLISHED);
1631 sk = iso_get_sock_listen(&hdev->bdaddr, bdaddr, iso_match_sid,
1634 iso_pi(sk)->sync_handle = le16_to_cpu(ev1->handle);
1639 ev2 = hci_recv_event_data(hdev, HCI_EVT_LE_BIG_INFO_ADV_REPORT);
1641 sk = iso_get_sock_listen(&hdev->bdaddr, bdaddr,
1642 iso_match_sync_handle, ev2);
1646 if (ev2->num_bis < iso_pi(sk)->bc_num_bis)
1647 iso_pi(sk)->bc_num_bis = ev2->num_bis;
1649 if (!test_and_set_bit(BT_SK_BIG_SYNC, &iso_pi(sk)->flags)) {
1650 err = hci_le_big_create_sync(hdev,
1652 iso_pi(sk)->sync_handle,
1653 iso_pi(sk)->bc_num_bis,
1654 iso_pi(sk)->bc_bis);
1656 bt_dev_err(hdev, "hci_le_big_create_sync: %d",
1663 sk = iso_get_sock_listen(&hdev->bdaddr, BDADDR_ANY, NULL, NULL);
1670 lm |= HCI_LM_ACCEPT;
1672 if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))
1673 *flags |= HCI_PROTO_DEFER;
1678 static void iso_connect_cfm(struct hci_conn *hcon, __u8 status)
1680 if (hcon->type != ISO_LINK) {
1681 if (hcon->type != LE_LINK)
1684 /* Check if LE link has failed */
1686 struct hci_link *link, *t;
1688 list_for_each_entry_safe(link, t, &hcon->link_list,
1690 iso_conn_del(link->conn, bt_to_errno(status));
1695 /* Create CIS if pending */
1696 hci_le_create_cis_pending(hcon->hdev);
1700 BT_DBG("hcon %p bdaddr %pMR status %d", hcon, &hcon->dst, status);
1702 /* Similar to the success case, if HCI_CONN_BIG_SYNC_FAILED is set,
1703 * queue the failed bis connection into the accept queue of the
1704 * listening socket and wake up userspace, to inform the user about
1705 * the BIG sync failed event.
1707 if (!status || test_bit(HCI_CONN_BIG_SYNC_FAILED, &hcon->flags)) {
1708 struct iso_conn *conn;
1710 conn = iso_conn_add(hcon);
1712 iso_conn_ready(conn);
1714 iso_conn_del(hcon, bt_to_errno(status));
1718 static void iso_disconn_cfm(struct hci_conn *hcon, __u8 reason)
1720 if (hcon->type != ISO_LINK)
1723 BT_DBG("hcon %p reason %d", hcon, reason);
1725 iso_conn_del(hcon, bt_to_errno(reason));
1728 void iso_recv(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
1730 struct iso_conn *conn = hcon->iso_data;
1736 pb = hci_iso_flags_pb(flags);
1737 ts = hci_iso_flags_ts(flags);
1739 BT_DBG("conn %p len %d pb 0x%x ts 0x%x", conn, skb->len, pb, ts);
1745 BT_ERR("Unexpected start frame (len %d)", skb->len);
1746 kfree_skb(conn->rx_skb);
1747 conn->rx_skb = NULL;
1752 struct hci_iso_ts_data_hdr *hdr;
1754 /* TODO: add timestamp to the packet? */
1755 hdr = skb_pull_data(skb, HCI_ISO_TS_DATA_HDR_SIZE);
1757 BT_ERR("Frame is too short (len %d)", skb->len);
1761 len = __le16_to_cpu(hdr->slen);
1763 struct hci_iso_data_hdr *hdr;
1765 hdr = skb_pull_data(skb, HCI_ISO_DATA_HDR_SIZE);
1767 BT_ERR("Frame is too short (len %d)", skb->len);
1771 len = __le16_to_cpu(hdr->slen);
1774 flags = hci_iso_data_flags(len);
1775 len = hci_iso_data_len(len);
1777 BT_DBG("Start: total len %d, frag len %d flags 0x%4.4x", len,
1780 if (len == skb->len) {
1781 /* Complete frame received */
1782 hci_skb_pkt_status(skb) = flags & 0x03;
1783 iso_recv_frame(conn, skb);
1787 if (pb == ISO_SINGLE) {
1788 BT_ERR("Frame malformed (len %d, expected len %d)",
1793 if (skb->len > len) {
1794 BT_ERR("Frame is too long (len %d, expected len %d)",
1799 /* Allocate skb for the complete frame (with header) */
1800 conn->rx_skb = bt_skb_alloc(len, GFP_KERNEL);
1804 hci_skb_pkt_status(conn->rx_skb) = flags & 0x03;
1805 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
1807 conn->rx_len = len - skb->len;
1811 BT_DBG("Cont: frag len %d (expecting %d)", skb->len,
1814 if (!conn->rx_len) {
1815 BT_ERR("Unexpected continuation frame (len %d)",
1820 if (skb->len > conn->rx_len) {
1821 BT_ERR("Fragment is too long (len %d, expected %d)",
1822 skb->len, conn->rx_len);
1823 kfree_skb(conn->rx_skb);
1824 conn->rx_skb = NULL;
1829 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
1831 conn->rx_len -= skb->len;
1835 skb_copy_from_linear_data(skb, skb_put(conn->rx_skb, skb->len),
1837 conn->rx_len -= skb->len;
1839 if (!conn->rx_len) {
1840 struct sk_buff *rx_skb = conn->rx_skb;
1842 /* Complete frame received. iso_recv_frame
1843 * takes ownership of the skb so set the global
1844 * rx_skb pointer to NULL first.
1846 conn->rx_skb = NULL;
1847 iso_recv_frame(conn, rx_skb);
1856 static struct hci_cb iso_cb = {
1858 .connect_cfm = iso_connect_cfm,
1859 .disconn_cfm = iso_disconn_cfm,
1862 static int iso_debugfs_show(struct seq_file *f, void *p)
1866 read_lock(&iso_sk_list.lock);
1868 sk_for_each(sk, &iso_sk_list.head) {
1869 seq_printf(f, "%pMR %pMR %d\n", &iso_pi(sk)->src,
1870 &iso_pi(sk)->dst, sk->sk_state);
1873 read_unlock(&iso_sk_list.lock);
1878 DEFINE_SHOW_ATTRIBUTE(iso_debugfs);
1880 static struct dentry *iso_debugfs;
1882 static const struct proto_ops iso_sock_ops = {
1883 .family = PF_BLUETOOTH,
1884 .owner = THIS_MODULE,
1885 .release = iso_sock_release,
1886 .bind = iso_sock_bind,
1887 .connect = iso_sock_connect,
1888 .listen = iso_sock_listen,
1889 .accept = iso_sock_accept,
1890 .getname = iso_sock_getname,
1891 .sendmsg = iso_sock_sendmsg,
1892 .recvmsg = iso_sock_recvmsg,
1893 .poll = bt_sock_poll,
1894 .ioctl = bt_sock_ioctl,
1895 .mmap = sock_no_mmap,
1896 .socketpair = sock_no_socketpair,
1897 .shutdown = iso_sock_shutdown,
1898 .setsockopt = iso_sock_setsockopt,
1899 .getsockopt = iso_sock_getsockopt
1902 static const struct net_proto_family iso_sock_family_ops = {
1903 .family = PF_BLUETOOTH,
1904 .owner = THIS_MODULE,
1905 .create = iso_sock_create,
1908 static bool iso_inited;
1910 bool iso_enabled(void)
1919 BUILD_BUG_ON(sizeof(struct sockaddr_iso) > sizeof(struct sockaddr));
1924 err = proto_register(&iso_proto, 0);
1928 err = bt_sock_register(BTPROTO_ISO, &iso_sock_family_ops);
1930 BT_ERR("ISO socket registration failed");
1934 err = bt_procfs_init(&init_net, "iso", &iso_sk_list, NULL);
1936 BT_ERR("Failed to create ISO proc file");
1937 bt_sock_unregister(BTPROTO_ISO);
1941 BT_INFO("ISO socket layer initialized");
1943 hci_register_cb(&iso_cb);
1945 if (IS_ERR_OR_NULL(bt_debugfs))
1949 iso_debugfs = debugfs_create_file("iso", 0444, bt_debugfs,
1950 NULL, &iso_debugfs_fops);
1958 proto_unregister(&iso_proto);
1967 bt_procfs_cleanup(&init_net, "iso");
1969 debugfs_remove(iso_debugfs);
1972 hci_unregister_cb(&iso_cb);
1974 bt_sock_unregister(BTPROTO_ISO);
1976 proto_unregister(&iso_proto);