1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2015, Sony Mobile Communications Inc.
4 * Copyright (c) 2013, The Linux Foundation. All rights reserved.
6 #include <linux/module.h>
7 #include <linux/netlink.h>
8 #include <linux/qrtr.h>
9 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
10 #include <linux/spinlock.h>
11 #include <linux/wait.h>
17 #define QRTR_PROTO_VER_1 1
18 #define QRTR_PROTO_VER_2 3
21 #define QRTR_MIN_EPH_SOCKET 0x4000
22 #define QRTR_MAX_EPH_SOCKET 0x7fff
25 * struct qrtr_hdr_v1 - (I|R)PCrouter packet header version 1
26 * @version: protocol version
27 * @type: packet type; one of QRTR_TYPE_*
28 * @src_node_id: source node
29 * @src_port_id: source port
30 * @confirm_rx: boolean; whether a resume-tx packet should be send in reply
31 * @size: length of packet, excluding this header
32 * @dst_node_id: destination node
33 * @dst_port_id: destination port
47 * struct qrtr_hdr_v2 - (I|R)PCrouter packet header later versions
48 * @version: protocol version
49 * @type: packet type; one of QRTR_TYPE_*
50 * @flags: bitmask of QRTR_FLAGS_*
51 * @optlen: length of optional header data
52 * @size: length of packet, excluding this header and optlen
53 * @src_node_id: source node
54 * @src_port_id: source port
55 * @dst_node_id: destination node
56 * @dst_port_id: destination port
70 #define QRTR_FLAGS_CONFIRM_RX BIT(0)
82 #define QRTR_HDR_MAX_SIZE max_t(size_t, sizeof(struct qrtr_hdr_v1), \
83 sizeof(struct qrtr_hdr_v2))
86 /* WARNING: sk must be the first member */
88 struct sockaddr_qrtr us
;
89 struct sockaddr_qrtr peer
;
92 static inline struct qrtr_sock
*qrtr_sk(struct sock
*sk
)
94 BUILD_BUG_ON(offsetof(struct qrtr_sock
, sk
) != 0);
95 return container_of(sk
, struct qrtr_sock
, sk
);
98 static unsigned int qrtr_local_nid
= 1;
101 static RADIX_TREE(qrtr_nodes
, GFP_ATOMIC
);
102 static DEFINE_SPINLOCK(qrtr_nodes_lock
);
104 static LIST_HEAD(qrtr_all_nodes
);
105 /* lock for qrtr_all_nodes and node reference */
106 static DEFINE_MUTEX(qrtr_node_lock
);
108 /* local port allocation management */
109 static DEFINE_IDR(qrtr_ports
);
110 static DEFINE_MUTEX(qrtr_port_lock
);
113 * struct qrtr_node - endpoint node
114 * @ep_lock: lock for endpoint management and callbacks
116 * @ref: reference count for node
118 * @qrtr_tx_flow: tree of qrtr_tx_flow, keyed by node << 32 | port
119 * @qrtr_tx_lock: lock for qrtr_tx_flow inserts
120 * @rx_queue: receive queue
121 * @item: list item for broadcast list
124 struct mutex ep_lock
;
125 struct qrtr_endpoint
*ep
;
129 struct radix_tree_root qrtr_tx_flow
;
130 struct mutex qrtr_tx_lock
; /* for qrtr_tx_flow */
132 struct sk_buff_head rx_queue
;
133 struct list_head item
;
137 * struct qrtr_tx_flow - tx flow control
138 * @resume_tx: waiters for a resume tx from the remote
139 * @pending: number of waiting senders
140 * @tx_failed: indicates that a message with confirm_rx flag was lost
142 struct qrtr_tx_flow
{
143 struct wait_queue_head resume_tx
;
148 #define QRTR_TX_FLOW_HIGH 10
149 #define QRTR_TX_FLOW_LOW 5
151 static int qrtr_local_enqueue(struct qrtr_node
*node
, struct sk_buff
*skb
,
152 int type
, struct sockaddr_qrtr
*from
,
153 struct sockaddr_qrtr
*to
);
154 static int qrtr_bcast_enqueue(struct qrtr_node
*node
, struct sk_buff
*skb
,
155 int type
, struct sockaddr_qrtr
*from
,
156 struct sockaddr_qrtr
*to
);
157 static struct qrtr_sock
*qrtr_port_lookup(int port
);
158 static void qrtr_port_put(struct qrtr_sock
*ipc
);
160 /* Release node resources and free the node.
162 * Do not call directly, use qrtr_node_release. To be used with
163 * kref_put_mutex. As such, the node mutex is expected to be locked on call.
165 static void __qrtr_node_release(struct kref
*kref
)
167 struct qrtr_node
*node
= container_of(kref
, struct qrtr_node
, ref
);
168 struct radix_tree_iter iter
;
169 struct qrtr_tx_flow
*flow
;
173 spin_lock_irqsave(&qrtr_nodes_lock
, flags
);
174 if (node
->nid
!= QRTR_EP_NID_AUTO
)
175 radix_tree_delete(&qrtr_nodes
, node
->nid
);
176 spin_unlock_irqrestore(&qrtr_nodes_lock
, flags
);
178 list_del(&node
->item
);
179 mutex_unlock(&qrtr_node_lock
);
181 skb_queue_purge(&node
->rx_queue
);
183 /* Free tx flow counters */
184 radix_tree_for_each_slot(slot
, &node
->qrtr_tx_flow
, &iter
, 0) {
186 radix_tree_iter_delete(&node
->qrtr_tx_flow
, &iter
, slot
);
192 /* Increment reference to node. */
193 static struct qrtr_node
*qrtr_node_acquire(struct qrtr_node
*node
)
196 kref_get(&node
->ref
);
200 /* Decrement reference to node and release as necessary. */
201 static void qrtr_node_release(struct qrtr_node
*node
)
205 kref_put_mutex(&node
->ref
, __qrtr_node_release
, &qrtr_node_lock
);
209 * qrtr_tx_resume() - reset flow control counter
210 * @node: qrtr_node that the QRTR_TYPE_RESUME_TX packet arrived on
211 * @skb: resume_tx packet
213 static void qrtr_tx_resume(struct qrtr_node
*node
, struct sk_buff
*skb
)
215 struct qrtr_ctrl_pkt
*pkt
= (struct qrtr_ctrl_pkt
*)skb
->data
;
216 u64 remote_node
= le32_to_cpu(pkt
->client
.node
);
217 u32 remote_port
= le32_to_cpu(pkt
->client
.port
);
218 struct qrtr_tx_flow
*flow
;
221 key
= remote_node
<< 32 | remote_port
;
224 flow
= radix_tree_lookup(&node
->qrtr_tx_flow
, key
);
227 spin_lock(&flow
->resume_tx
.lock
);
229 spin_unlock(&flow
->resume_tx
.lock
);
230 wake_up_interruptible_all(&flow
->resume_tx
);
237 * qrtr_tx_wait() - flow control for outgoing packets
238 * @node: qrtr_node that the packet is to be send to
239 * @dest_node: node id of the destination
240 * @dest_port: port number of the destination
241 * @type: type of message
243 * The flow control scheme is based around the low and high "watermarks". When
244 * the low watermark is passed the confirm_rx flag is set on the outgoing
245 * message, which will trigger the remote to send a control message of the type
246 * QRTR_TYPE_RESUME_TX to reset the counter. If the high watermark is hit
247 * further transmision should be paused.
249 * Return: 1 if confirm_rx should be set, 0 otherwise or errno failure
251 static int qrtr_tx_wait(struct qrtr_node
*node
, int dest_node
, int dest_port
,
254 unsigned long key
= (u64
)dest_node
<< 32 | dest_port
;
255 struct qrtr_tx_flow
*flow
;
259 /* Never set confirm_rx on non-data packets */
260 if (type
!= QRTR_TYPE_DATA
)
263 mutex_lock(&node
->qrtr_tx_lock
);
264 flow
= radix_tree_lookup(&node
->qrtr_tx_flow
, key
);
266 flow
= kzalloc(sizeof(*flow
), GFP_KERNEL
);
268 init_waitqueue_head(&flow
->resume_tx
);
269 radix_tree_insert(&node
->qrtr_tx_flow
, key
, flow
);
272 mutex_unlock(&node
->qrtr_tx_lock
);
274 /* Set confirm_rx if we where unable to find and allocate a flow */
278 spin_lock_irq(&flow
->resume_tx
.lock
);
279 ret
= wait_event_interruptible_locked_irq(flow
->resume_tx
,
280 flow
->pending
< QRTR_TX_FLOW_HIGH
||
285 } else if (!node
->ep
) {
287 } else if (flow
->tx_failed
) {
292 confirm_rx
= flow
->pending
== QRTR_TX_FLOW_LOW
;
294 spin_unlock_irq(&flow
->resume_tx
.lock
);
300 * qrtr_tx_flow_failed() - flag that tx of confirm_rx flagged messages failed
301 * @node: qrtr_node that the packet is to be send to
302 * @dest_node: node id of the destination
303 * @dest_port: port number of the destination
305 * Signal that the transmission of a message with confirm_rx flag failed. The
306 * flow's "pending" counter will keep incrementing towards QRTR_TX_FLOW_HIGH,
307 * at which point transmission would stall forever waiting for the resume TX
308 * message associated with the dropped confirm_rx message.
309 * Work around this by marking the flow as having a failed transmission and
310 * cause the next transmission attempt to be sent with the confirm_rx.
312 static void qrtr_tx_flow_failed(struct qrtr_node
*node
, int dest_node
,
315 unsigned long key
= (u64
)dest_node
<< 32 | dest_port
;
316 struct qrtr_tx_flow
*flow
;
319 flow
= radix_tree_lookup(&node
->qrtr_tx_flow
, key
);
322 spin_lock_irq(&flow
->resume_tx
.lock
);
324 spin_unlock_irq(&flow
->resume_tx
.lock
);
328 /* Pass an outgoing packet socket buffer to the endpoint driver. */
329 static int qrtr_node_enqueue(struct qrtr_node
*node
, struct sk_buff
*skb
,
330 int type
, struct sockaddr_qrtr
*from
,
331 struct sockaddr_qrtr
*to
)
333 struct qrtr_hdr_v1
*hdr
;
334 size_t len
= skb
->len
;
337 confirm_rx
= qrtr_tx_wait(node
, to
->sq_node
, to
->sq_port
, type
);
338 if (confirm_rx
< 0) {
343 hdr
= skb_push(skb
, sizeof(*hdr
));
344 hdr
->version
= cpu_to_le32(QRTR_PROTO_VER_1
);
345 hdr
->type
= cpu_to_le32(type
);
346 hdr
->src_node_id
= cpu_to_le32(from
->sq_node
);
347 hdr
->src_port_id
= cpu_to_le32(from
->sq_port
);
348 if (to
->sq_port
== QRTR_PORT_CTRL
) {
349 hdr
->dst_node_id
= cpu_to_le32(node
->nid
);
350 hdr
->dst_port_id
= cpu_to_le32(QRTR_NODE_BCAST
);
352 hdr
->dst_node_id
= cpu_to_le32(to
->sq_node
);
353 hdr
->dst_port_id
= cpu_to_le32(to
->sq_port
);
356 hdr
->size
= cpu_to_le32(len
);
357 hdr
->confirm_rx
= !!confirm_rx
;
359 rc
= skb_put_padto(skb
, ALIGN(len
, 4) + sizeof(*hdr
));
362 mutex_lock(&node
->ep_lock
);
365 rc
= node
->ep
->xmit(node
->ep
, skb
);
368 mutex_unlock(&node
->ep_lock
);
370 /* Need to ensure that a subsequent message carries the otherwise lost
371 * confirm_rx flag if we dropped this one */
372 if (rc
&& confirm_rx
)
373 qrtr_tx_flow_failed(node
, to
->sq_node
, to
->sq_port
);
378 /* Lookup node by id.
380 * callers must release with qrtr_node_release()
382 static struct qrtr_node
*qrtr_node_lookup(unsigned int nid
)
384 struct qrtr_node
*node
;
387 spin_lock_irqsave(&qrtr_nodes_lock
, flags
);
388 node
= radix_tree_lookup(&qrtr_nodes
, nid
);
389 node
= qrtr_node_acquire(node
);
390 spin_unlock_irqrestore(&qrtr_nodes_lock
, flags
);
395 /* Assign node id to node.
397 * This is mostly useful for automatic node id assignment, based on
398 * the source id in the incoming packet.
400 static void qrtr_node_assign(struct qrtr_node
*node
, unsigned int nid
)
404 if (node
->nid
!= QRTR_EP_NID_AUTO
|| nid
== QRTR_EP_NID_AUTO
)
407 spin_lock_irqsave(&qrtr_nodes_lock
, flags
);
408 radix_tree_insert(&qrtr_nodes
, nid
, node
);
410 spin_unlock_irqrestore(&qrtr_nodes_lock
, flags
);
414 * qrtr_endpoint_post() - post incoming data
415 * @ep: endpoint handle
416 * @data: data pointer
417 * @len: size of data in bytes
419 * Return: 0 on success; negative error code on failure
421 int qrtr_endpoint_post(struct qrtr_endpoint
*ep
, const void *data
, size_t len
)
423 struct qrtr_node
*node
= ep
->node
;
424 const struct qrtr_hdr_v1
*v1
;
425 const struct qrtr_hdr_v2
*v2
;
426 struct qrtr_sock
*ipc
;
433 if (len
== 0 || len
& 3)
436 skb
= netdev_alloc_skb(NULL
, len
);
440 cb
= (struct qrtr_cb
*)skb
->cb
;
442 /* Version field in v1 is little endian, so this works for both cases */
446 case QRTR_PROTO_VER_1
:
447 if (len
< sizeof(*v1
))
450 hdrlen
= sizeof(*v1
);
452 cb
->type
= le32_to_cpu(v1
->type
);
453 cb
->src_node
= le32_to_cpu(v1
->src_node_id
);
454 cb
->src_port
= le32_to_cpu(v1
->src_port_id
);
455 cb
->confirm_rx
= !!v1
->confirm_rx
;
456 cb
->dst_node
= le32_to_cpu(v1
->dst_node_id
);
457 cb
->dst_port
= le32_to_cpu(v1
->dst_port_id
);
459 size
= le32_to_cpu(v1
->size
);
461 case QRTR_PROTO_VER_2
:
462 if (len
< sizeof(*v2
))
465 hdrlen
= sizeof(*v2
) + v2
->optlen
;
468 cb
->confirm_rx
= !!(v2
->flags
& QRTR_FLAGS_CONFIRM_RX
);
469 cb
->src_node
= le16_to_cpu(v2
->src_node_id
);
470 cb
->src_port
= le16_to_cpu(v2
->src_port_id
);
471 cb
->dst_node
= le16_to_cpu(v2
->dst_node_id
);
472 cb
->dst_port
= le16_to_cpu(v2
->dst_port_id
);
474 if (cb
->src_port
== (u16
)QRTR_PORT_CTRL
)
475 cb
->src_port
= QRTR_PORT_CTRL
;
476 if (cb
->dst_port
== (u16
)QRTR_PORT_CTRL
)
477 cb
->dst_port
= QRTR_PORT_CTRL
;
479 size
= le32_to_cpu(v2
->size
);
482 pr_err("qrtr: Invalid version %d\n", ver
);
486 if (len
!= ALIGN(size
, 4) + hdrlen
)
489 if (cb
->dst_port
!= QRTR_PORT_CTRL
&& cb
->type
!= QRTR_TYPE_DATA
&&
490 cb
->type
!= QRTR_TYPE_RESUME_TX
)
493 skb_put_data(skb
, data
+ hdrlen
, size
);
495 qrtr_node_assign(node
, cb
->src_node
);
497 if (cb
->type
== QRTR_TYPE_RESUME_TX
) {
498 qrtr_tx_resume(node
, skb
);
500 ipc
= qrtr_port_lookup(cb
->dst_port
);
504 if (sock_queue_rcv_skb(&ipc
->sk
, skb
))
517 EXPORT_SYMBOL_GPL(qrtr_endpoint_post
);
520 * qrtr_alloc_ctrl_packet() - allocate control packet skb
521 * @pkt: reference to qrtr_ctrl_pkt pointer
523 * Returns newly allocated sk_buff, or NULL on failure
525 * This function allocates a sk_buff large enough to carry a qrtr_ctrl_pkt and
526 * on success returns a reference to the control packet in @pkt.
528 static struct sk_buff
*qrtr_alloc_ctrl_packet(struct qrtr_ctrl_pkt
**pkt
)
530 const int pkt_len
= sizeof(struct qrtr_ctrl_pkt
);
533 skb
= alloc_skb(QRTR_HDR_MAX_SIZE
+ pkt_len
, GFP_KERNEL
);
537 skb_reserve(skb
, QRTR_HDR_MAX_SIZE
);
538 *pkt
= skb_put_zero(skb
, pkt_len
);
544 * qrtr_endpoint_register() - register a new endpoint
545 * @ep: endpoint to register
546 * @nid: desired node id; may be QRTR_EP_NID_AUTO for auto-assignment
547 * Return: 0 on success; negative error code on failure
549 * The specified endpoint must have the xmit function pointer set on call.
551 int qrtr_endpoint_register(struct qrtr_endpoint
*ep
, unsigned int nid
)
553 struct qrtr_node
*node
;
555 if (!ep
|| !ep
->xmit
)
558 node
= kzalloc(sizeof(*node
), GFP_KERNEL
);
562 kref_init(&node
->ref
);
563 mutex_init(&node
->ep_lock
);
564 skb_queue_head_init(&node
->rx_queue
);
565 node
->nid
= QRTR_EP_NID_AUTO
;
568 INIT_RADIX_TREE(&node
->qrtr_tx_flow
, GFP_KERNEL
);
569 mutex_init(&node
->qrtr_tx_lock
);
571 qrtr_node_assign(node
, nid
);
573 mutex_lock(&qrtr_node_lock
);
574 list_add(&node
->item
, &qrtr_all_nodes
);
575 mutex_unlock(&qrtr_node_lock
);
580 EXPORT_SYMBOL_GPL(qrtr_endpoint_register
);
583 * qrtr_endpoint_unregister - unregister endpoint
584 * @ep: endpoint to unregister
586 void qrtr_endpoint_unregister(struct qrtr_endpoint
*ep
)
588 struct qrtr_node
*node
= ep
->node
;
589 struct sockaddr_qrtr src
= {AF_QIPCRTR
, node
->nid
, QRTR_PORT_CTRL
};
590 struct sockaddr_qrtr dst
= {AF_QIPCRTR
, qrtr_local_nid
, QRTR_PORT_CTRL
};
591 struct radix_tree_iter iter
;
592 struct qrtr_ctrl_pkt
*pkt
;
593 struct qrtr_tx_flow
*flow
;
597 mutex_lock(&node
->ep_lock
);
599 mutex_unlock(&node
->ep_lock
);
601 /* Notify the local controller about the event */
602 skb
= qrtr_alloc_ctrl_packet(&pkt
);
604 pkt
->cmd
= cpu_to_le32(QRTR_TYPE_BYE
);
605 qrtr_local_enqueue(NULL
, skb
, QRTR_TYPE_BYE
, &src
, &dst
);
608 /* Wake up any transmitters waiting for resume-tx from the node */
609 mutex_lock(&node
->qrtr_tx_lock
);
610 radix_tree_for_each_slot(slot
, &node
->qrtr_tx_flow
, &iter
, 0) {
612 wake_up_interruptible_all(&flow
->resume_tx
);
614 mutex_unlock(&node
->qrtr_tx_lock
);
616 qrtr_node_release(node
);
619 EXPORT_SYMBOL_GPL(qrtr_endpoint_unregister
);
621 /* Lookup socket by port.
623 * Callers must release with qrtr_port_put()
625 static struct qrtr_sock
*qrtr_port_lookup(int port
)
627 struct qrtr_sock
*ipc
;
629 if (port
== QRTR_PORT_CTRL
)
633 ipc
= idr_find(&qrtr_ports
, port
);
641 /* Release acquired socket. */
642 static void qrtr_port_put(struct qrtr_sock
*ipc
)
647 /* Remove port assignment. */
648 static void qrtr_port_remove(struct qrtr_sock
*ipc
)
650 struct qrtr_ctrl_pkt
*pkt
;
652 int port
= ipc
->us
.sq_port
;
653 struct sockaddr_qrtr to
;
655 to
.sq_family
= AF_QIPCRTR
;
656 to
.sq_node
= QRTR_NODE_BCAST
;
657 to
.sq_port
= QRTR_PORT_CTRL
;
659 skb
= qrtr_alloc_ctrl_packet(&pkt
);
661 pkt
->cmd
= cpu_to_le32(QRTR_TYPE_DEL_CLIENT
);
662 pkt
->client
.node
= cpu_to_le32(ipc
->us
.sq_node
);
663 pkt
->client
.port
= cpu_to_le32(ipc
->us
.sq_port
);
665 skb_set_owner_w(skb
, &ipc
->sk
);
666 qrtr_bcast_enqueue(NULL
, skb
, QRTR_TYPE_DEL_CLIENT
, &ipc
->us
,
670 if (port
== QRTR_PORT_CTRL
)
673 __sock_put(&ipc
->sk
);
675 mutex_lock(&qrtr_port_lock
);
676 idr_remove(&qrtr_ports
, port
);
677 mutex_unlock(&qrtr_port_lock
);
679 /* Ensure that if qrtr_port_lookup() did enter the RCU read section we
680 * wait for it to up increment the refcount */
684 /* Assign port number to socket.
686 * Specify port in the integer pointed to by port, and it will be adjusted
687 * on return as necesssary.
690 * 0: Assign ephemeral port in [QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET]
691 * <QRTR_MIN_EPH_SOCKET: Specified; requires CAP_NET_ADMIN
692 * >QRTR_MIN_EPH_SOCKET: Specified; available to all
694 static int qrtr_port_assign(struct qrtr_sock
*ipc
, int *port
)
699 mutex_lock(&qrtr_port_lock
);
701 min_port
= QRTR_MIN_EPH_SOCKET
;
702 rc
= idr_alloc_u32(&qrtr_ports
, ipc
, &min_port
, QRTR_MAX_EPH_SOCKET
, GFP_ATOMIC
);
705 } else if (*port
< QRTR_MIN_EPH_SOCKET
&& !capable(CAP_NET_ADMIN
)) {
707 } else if (*port
== QRTR_PORT_CTRL
) {
709 rc
= idr_alloc_u32(&qrtr_ports
, ipc
, &min_port
, 0, GFP_ATOMIC
);
712 rc
= idr_alloc_u32(&qrtr_ports
, ipc
, &min_port
, *port
, GFP_ATOMIC
);
716 mutex_unlock(&qrtr_port_lock
);
728 /* Reset all non-control ports */
729 static void qrtr_reset_ports(void)
731 struct qrtr_sock
*ipc
;
734 mutex_lock(&qrtr_port_lock
);
735 idr_for_each_entry(&qrtr_ports
, ipc
, id
) {
736 /* Don't reset control port */
741 ipc
->sk
.sk_err
= ENETRESET
;
742 ipc
->sk
.sk_error_report(&ipc
->sk
);
745 mutex_unlock(&qrtr_port_lock
);
748 /* Bind socket to address.
750 * Socket should be locked upon call.
752 static int __qrtr_bind(struct socket
*sock
,
753 const struct sockaddr_qrtr
*addr
, int zapped
)
755 struct qrtr_sock
*ipc
= qrtr_sk(sock
->sk
);
756 struct sock
*sk
= sock
->sk
;
761 if (!zapped
&& addr
->sq_port
== ipc
->us
.sq_port
)
764 port
= addr
->sq_port
;
765 rc
= qrtr_port_assign(ipc
, &port
);
769 /* unbind previous, if any */
771 qrtr_port_remove(ipc
);
772 ipc
->us
.sq_port
= port
;
774 sock_reset_flag(sk
, SOCK_ZAPPED
);
776 /* Notify all open ports about the new controller */
777 if (port
== QRTR_PORT_CTRL
)
783 /* Auto bind to an ephemeral port. */
784 static int qrtr_autobind(struct socket
*sock
)
786 struct sock
*sk
= sock
->sk
;
787 struct sockaddr_qrtr addr
;
789 if (!sock_flag(sk
, SOCK_ZAPPED
))
792 addr
.sq_family
= AF_QIPCRTR
;
793 addr
.sq_node
= qrtr_local_nid
;
796 return __qrtr_bind(sock
, &addr
, 1);
799 /* Bind socket to specified sockaddr. */
800 static int qrtr_bind(struct socket
*sock
, struct sockaddr
*saddr
, int len
)
802 DECLARE_SOCKADDR(struct sockaddr_qrtr
*, addr
, saddr
);
803 struct qrtr_sock
*ipc
= qrtr_sk(sock
->sk
);
804 struct sock
*sk
= sock
->sk
;
807 if (len
< sizeof(*addr
) || addr
->sq_family
!= AF_QIPCRTR
)
810 if (addr
->sq_node
!= ipc
->us
.sq_node
)
814 rc
= __qrtr_bind(sock
, addr
, sock_flag(sk
, SOCK_ZAPPED
));
820 /* Queue packet to local peer socket. */
821 static int qrtr_local_enqueue(struct qrtr_node
*node
, struct sk_buff
*skb
,
822 int type
, struct sockaddr_qrtr
*from
,
823 struct sockaddr_qrtr
*to
)
825 struct qrtr_sock
*ipc
;
828 ipc
= qrtr_port_lookup(to
->sq_port
);
829 if (!ipc
|| &ipc
->sk
== skb
->sk
) { /* do not send to self */
834 cb
= (struct qrtr_cb
*)skb
->cb
;
835 cb
->src_node
= from
->sq_node
;
836 cb
->src_port
= from
->sq_port
;
838 if (sock_queue_rcv_skb(&ipc
->sk
, skb
)) {
849 /* Queue packet for broadcast. */
850 static int qrtr_bcast_enqueue(struct qrtr_node
*node
, struct sk_buff
*skb
,
851 int type
, struct sockaddr_qrtr
*from
,
852 struct sockaddr_qrtr
*to
)
854 struct sk_buff
*skbn
;
856 mutex_lock(&qrtr_node_lock
);
857 list_for_each_entry(node
, &qrtr_all_nodes
, item
) {
858 skbn
= skb_clone(skb
, GFP_KERNEL
);
861 skb_set_owner_w(skbn
, skb
->sk
);
862 qrtr_node_enqueue(node
, skbn
, type
, from
, to
);
864 mutex_unlock(&qrtr_node_lock
);
866 qrtr_local_enqueue(NULL
, skb
, type
, from
, to
);
871 static int qrtr_sendmsg(struct socket
*sock
, struct msghdr
*msg
, size_t len
)
873 DECLARE_SOCKADDR(struct sockaddr_qrtr
*, addr
, msg
->msg_name
);
874 int (*enqueue_fn
)(struct qrtr_node
*, struct sk_buff
*, int,
875 struct sockaddr_qrtr
*, struct sockaddr_qrtr
*);
876 __le32 qrtr_type
= cpu_to_le32(QRTR_TYPE_DATA
);
877 struct qrtr_sock
*ipc
= qrtr_sk(sock
->sk
);
878 struct sock
*sk
= sock
->sk
;
879 struct qrtr_node
*node
;
885 if (msg
->msg_flags
& ~(MSG_DONTWAIT
))
894 if (msg
->msg_namelen
< sizeof(*addr
)) {
899 if (addr
->sq_family
!= AF_QIPCRTR
) {
904 rc
= qrtr_autobind(sock
);
909 } else if (sk
->sk_state
== TCP_ESTABLISHED
) {
917 if (addr
->sq_node
== QRTR_NODE_BCAST
) {
918 if (addr
->sq_port
!= QRTR_PORT_CTRL
&&
919 qrtr_local_nid
!= QRTR_NODE_BCAST
) {
923 enqueue_fn
= qrtr_bcast_enqueue
;
924 } else if (addr
->sq_node
== ipc
->us
.sq_node
) {
925 enqueue_fn
= qrtr_local_enqueue
;
927 node
= qrtr_node_lookup(addr
->sq_node
);
932 enqueue_fn
= qrtr_node_enqueue
;
935 plen
= (len
+ 3) & ~3;
936 skb
= sock_alloc_send_skb(sk
, plen
+ QRTR_HDR_MAX_SIZE
,
937 msg
->msg_flags
& MSG_DONTWAIT
, &rc
);
941 skb_reserve(skb
, QRTR_HDR_MAX_SIZE
);
943 rc
= memcpy_from_msg(skb_put(skb
, len
), msg
, len
);
949 if (ipc
->us
.sq_port
== QRTR_PORT_CTRL
) {
956 /* control messages already require the type as 'command' */
957 skb_copy_bits(skb
, 0, &qrtr_type
, 4);
960 type
= le32_to_cpu(qrtr_type
);
961 rc
= enqueue_fn(node
, skb
, type
, &ipc
->us
, addr
);
966 qrtr_node_release(node
);
972 static int qrtr_send_resume_tx(struct qrtr_cb
*cb
)
974 struct sockaddr_qrtr remote
= { AF_QIPCRTR
, cb
->src_node
, cb
->src_port
};
975 struct sockaddr_qrtr local
= { AF_QIPCRTR
, cb
->dst_node
, cb
->dst_port
};
976 struct qrtr_ctrl_pkt
*pkt
;
977 struct qrtr_node
*node
;
981 node
= qrtr_node_lookup(remote
.sq_node
);
985 skb
= qrtr_alloc_ctrl_packet(&pkt
);
989 pkt
->cmd
= cpu_to_le32(QRTR_TYPE_RESUME_TX
);
990 pkt
->client
.node
= cpu_to_le32(cb
->dst_node
);
991 pkt
->client
.port
= cpu_to_le32(cb
->dst_port
);
993 ret
= qrtr_node_enqueue(node
, skb
, QRTR_TYPE_RESUME_TX
, &local
, &remote
);
995 qrtr_node_release(node
);
1000 static int qrtr_recvmsg(struct socket
*sock
, struct msghdr
*msg
,
1001 size_t size
, int flags
)
1003 DECLARE_SOCKADDR(struct sockaddr_qrtr
*, addr
, msg
->msg_name
);
1004 struct sock
*sk
= sock
->sk
;
1005 struct sk_buff
*skb
;
1011 if (sock_flag(sk
, SOCK_ZAPPED
)) {
1013 return -EADDRNOTAVAIL
;
1016 skb
= skb_recv_datagram(sk
, flags
& ~MSG_DONTWAIT
,
1017 flags
& MSG_DONTWAIT
, &rc
);
1022 cb
= (struct qrtr_cb
*)skb
->cb
;
1025 if (copied
> size
) {
1027 msg
->msg_flags
|= MSG_TRUNC
;
1030 rc
= skb_copy_datagram_msg(skb
, 0, msg
, copied
);
1036 addr
->sq_family
= AF_QIPCRTR
;
1037 addr
->sq_node
= cb
->src_node
;
1038 addr
->sq_port
= cb
->src_port
;
1039 msg
->msg_namelen
= sizeof(*addr
);
1044 qrtr_send_resume_tx(cb
);
1046 skb_free_datagram(sk
, skb
);
1052 static int qrtr_connect(struct socket
*sock
, struct sockaddr
*saddr
,
1055 DECLARE_SOCKADDR(struct sockaddr_qrtr
*, addr
, saddr
);
1056 struct qrtr_sock
*ipc
= qrtr_sk(sock
->sk
);
1057 struct sock
*sk
= sock
->sk
;
1060 if (len
< sizeof(*addr
) || addr
->sq_family
!= AF_QIPCRTR
)
1065 sk
->sk_state
= TCP_CLOSE
;
1066 sock
->state
= SS_UNCONNECTED
;
1068 rc
= qrtr_autobind(sock
);
1075 sock
->state
= SS_CONNECTED
;
1076 sk
->sk_state
= TCP_ESTABLISHED
;
1083 static int qrtr_getname(struct socket
*sock
, struct sockaddr
*saddr
,
1086 struct qrtr_sock
*ipc
= qrtr_sk(sock
->sk
);
1087 struct sockaddr_qrtr qaddr
;
1088 struct sock
*sk
= sock
->sk
;
1092 if (sk
->sk_state
!= TCP_ESTABLISHED
) {
1103 qaddr
.sq_family
= AF_QIPCRTR
;
1105 memcpy(saddr
, &qaddr
, sizeof(qaddr
));
1107 return sizeof(qaddr
);
1110 static int qrtr_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
1112 void __user
*argp
= (void __user
*)arg
;
1113 struct qrtr_sock
*ipc
= qrtr_sk(sock
->sk
);
1114 struct sock
*sk
= sock
->sk
;
1115 struct sockaddr_qrtr
*sq
;
1116 struct sk_buff
*skb
;
1125 len
= sk
->sk_sndbuf
- sk_wmem_alloc_get(sk
);
1128 rc
= put_user(len
, (int __user
*)argp
);
1131 skb
= skb_peek(&sk
->sk_receive_queue
);
1134 rc
= put_user(len
, (int __user
*)argp
);
1137 if (copy_from_user(&ifr
, argp
, sizeof(ifr
))) {
1142 sq
= (struct sockaddr_qrtr
*)&ifr
.ifr_addr
;
1144 if (copy_to_user(argp
, &ifr
, sizeof(ifr
))) {
1152 case SIOCGIFDSTADDR
:
1153 case SIOCSIFDSTADDR
:
1154 case SIOCGIFBRDADDR
:
1155 case SIOCSIFBRDADDR
:
1156 case SIOCGIFNETMASK
:
1157 case SIOCSIFNETMASK
:
1170 static int qrtr_release(struct socket
*sock
)
1172 struct sock
*sk
= sock
->sk
;
1173 struct qrtr_sock
*ipc
;
1181 sk
->sk_shutdown
= SHUTDOWN_MASK
;
1182 if (!sock_flag(sk
, SOCK_DEAD
))
1183 sk
->sk_state_change(sk
);
1185 sock_set_flag(sk
, SOCK_DEAD
);
1189 if (!sock_flag(sk
, SOCK_ZAPPED
))
1190 qrtr_port_remove(ipc
);
1192 skb_queue_purge(&sk
->sk_receive_queue
);
1200 static const struct proto_ops qrtr_proto_ops
= {
1201 .owner
= THIS_MODULE
,
1202 .family
= AF_QIPCRTR
,
1204 .connect
= qrtr_connect
,
1205 .socketpair
= sock_no_socketpair
,
1206 .accept
= sock_no_accept
,
1207 .listen
= sock_no_listen
,
1208 .sendmsg
= qrtr_sendmsg
,
1209 .recvmsg
= qrtr_recvmsg
,
1210 .getname
= qrtr_getname
,
1211 .ioctl
= qrtr_ioctl
,
1212 .gettstamp
= sock_gettstamp
,
1213 .poll
= datagram_poll
,
1214 .shutdown
= sock_no_shutdown
,
1215 .release
= qrtr_release
,
1216 .mmap
= sock_no_mmap
,
1217 .sendpage
= sock_no_sendpage
,
1220 static struct proto qrtr_proto
= {
1222 .owner
= THIS_MODULE
,
1223 .obj_size
= sizeof(struct qrtr_sock
),
1226 static int qrtr_create(struct net
*net
, struct socket
*sock
,
1227 int protocol
, int kern
)
1229 struct qrtr_sock
*ipc
;
1232 if (sock
->type
!= SOCK_DGRAM
)
1235 sk
= sk_alloc(net
, AF_QIPCRTR
, GFP_KERNEL
, &qrtr_proto
, kern
);
1239 sock_set_flag(sk
, SOCK_ZAPPED
);
1241 sock_init_data(sock
, sk
);
1242 sock
->ops
= &qrtr_proto_ops
;
1245 ipc
->us
.sq_family
= AF_QIPCRTR
;
1246 ipc
->us
.sq_node
= qrtr_local_nid
;
1247 ipc
->us
.sq_port
= 0;
1252 static const struct net_proto_family qrtr_family
= {
1253 .owner
= THIS_MODULE
,
1254 .family
= AF_QIPCRTR
,
1255 .create
= qrtr_create
,
1258 static int __init
qrtr_proto_init(void)
1262 rc
= proto_register(&qrtr_proto
, 1);
1266 rc
= sock_register(&qrtr_family
);
1268 proto_unregister(&qrtr_proto
);
1276 postcore_initcall(qrtr_proto_init
);
1278 static void __exit
qrtr_proto_fini(void)
1281 sock_unregister(qrtr_family
.family
);
1282 proto_unregister(&qrtr_proto
);
1284 module_exit(qrtr_proto_fini
);
1286 MODULE_DESCRIPTION("Qualcomm IPC-router driver");
1287 MODULE_LICENSE("GPL v2");
1288 MODULE_ALIAS_NETPROTO(PF_QIPCRTR
);