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
23 #define QRTR_EPH_PORT_RANGE \
24 XA_LIMIT(QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET)
27 * struct qrtr_hdr_v1 - (I|R)PCrouter packet header version 1
28 * @version: protocol version
29 * @type: packet type; one of QRTR_TYPE_*
30 * @src_node_id: source node
31 * @src_port_id: source port
32 * @confirm_rx: boolean; whether a resume-tx packet should be send in reply
33 * @size: length of packet, excluding this header
34 * @dst_node_id: destination node
35 * @dst_port_id: destination port
49 * struct qrtr_hdr_v2 - (I|R)PCrouter packet header later versions
50 * @version: protocol version
51 * @type: packet type; one of QRTR_TYPE_*
52 * @flags: bitmask of QRTR_FLAGS_*
53 * @optlen: length of optional header data
54 * @size: length of packet, excluding this header and optlen
55 * @src_node_id: source node
56 * @src_port_id: source port
57 * @dst_node_id: destination node
58 * @dst_port_id: destination port
72 #define QRTR_FLAGS_CONFIRM_RX BIT(0)
84 #define QRTR_HDR_MAX_SIZE max_t(size_t, sizeof(struct qrtr_hdr_v1), \
85 sizeof(struct qrtr_hdr_v2))
88 /* WARNING: sk must be the first member */
90 struct sockaddr_qrtr us;
91 struct sockaddr_qrtr peer;
94 static inline struct qrtr_sock *qrtr_sk(struct sock *sk)
96 BUILD_BUG_ON(offsetof(struct qrtr_sock, sk) != 0);
97 return container_of(sk, struct qrtr_sock, sk);
100 static unsigned int qrtr_local_nid = 1;
103 static RADIX_TREE(qrtr_nodes, GFP_ATOMIC);
104 static DEFINE_SPINLOCK(qrtr_nodes_lock);
106 static LIST_HEAD(qrtr_all_nodes);
107 /* lock for qrtr_all_nodes and node reference */
108 static DEFINE_MUTEX(qrtr_node_lock);
110 /* local port allocation management */
111 static DEFINE_XARRAY_ALLOC(qrtr_ports);
114 * struct qrtr_node - endpoint node
115 * @ep_lock: lock for endpoint management and callbacks
117 * @ref: reference count for node
119 * @qrtr_tx_flow: tree of qrtr_tx_flow, keyed by node << 32 | port
120 * @qrtr_tx_lock: lock for qrtr_tx_flow inserts
121 * @rx_queue: receive queue
122 * @item: list item for broadcast list
125 struct mutex ep_lock;
126 struct qrtr_endpoint *ep;
130 struct radix_tree_root qrtr_tx_flow;
131 struct mutex qrtr_tx_lock; /* for qrtr_tx_flow */
133 struct sk_buff_head rx_queue;
134 struct list_head item;
138 * struct qrtr_tx_flow - tx flow control
139 * @resume_tx: waiters for a resume tx from the remote
140 * @pending: number of waiting senders
141 * @tx_failed: indicates that a message with confirm_rx flag was lost
143 struct qrtr_tx_flow {
144 struct wait_queue_head resume_tx;
149 #define QRTR_TX_FLOW_HIGH 10
150 #define QRTR_TX_FLOW_LOW 5
152 static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb,
153 int type, struct sockaddr_qrtr *from,
154 struct sockaddr_qrtr *to);
155 static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb,
156 int type, struct sockaddr_qrtr *from,
157 struct sockaddr_qrtr *to);
158 static struct qrtr_sock *qrtr_port_lookup(int port);
159 static void qrtr_port_put(struct qrtr_sock *ipc);
161 /* Release node resources and free the node.
163 * Do not call directly, use qrtr_node_release. To be used with
164 * kref_put_mutex. As such, the node mutex is expected to be locked on call.
166 static void __qrtr_node_release(struct kref *kref)
168 struct qrtr_node *node = container_of(kref, struct qrtr_node, ref);
169 struct radix_tree_iter iter;
170 struct qrtr_tx_flow *flow;
174 spin_lock_irqsave(&qrtr_nodes_lock, flags);
175 /* If the node is a bridge for other nodes, there are possibly
176 * multiple entries pointing to our released node, delete them all.
178 radix_tree_for_each_slot(slot, &qrtr_nodes, &iter, 0) {
180 radix_tree_iter_delete(&qrtr_nodes, &iter, slot);
182 spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
184 list_del(&node->item);
185 mutex_unlock(&qrtr_node_lock);
187 skb_queue_purge(&node->rx_queue);
189 /* Free tx flow counters */
190 radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) {
192 radix_tree_iter_delete(&node->qrtr_tx_flow, &iter, slot);
198 /* Increment reference to node. */
199 static struct qrtr_node *qrtr_node_acquire(struct qrtr_node *node)
202 kref_get(&node->ref);
206 /* Decrement reference to node and release as necessary. */
207 static void qrtr_node_release(struct qrtr_node *node)
211 kref_put_mutex(&node->ref, __qrtr_node_release, &qrtr_node_lock);
215 * qrtr_tx_resume() - reset flow control counter
216 * @node: qrtr_node that the QRTR_TYPE_RESUME_TX packet arrived on
217 * @skb: resume_tx packet
219 static void qrtr_tx_resume(struct qrtr_node *node, struct sk_buff *skb)
221 struct qrtr_ctrl_pkt *pkt = (struct qrtr_ctrl_pkt *)skb->data;
222 u64 remote_node = le32_to_cpu(pkt->client.node);
223 u32 remote_port = le32_to_cpu(pkt->client.port);
224 struct qrtr_tx_flow *flow;
227 key = remote_node << 32 | remote_port;
230 flow = radix_tree_lookup(&node->qrtr_tx_flow, key);
233 spin_lock(&flow->resume_tx.lock);
235 spin_unlock(&flow->resume_tx.lock);
236 wake_up_interruptible_all(&flow->resume_tx);
243 * qrtr_tx_wait() - flow control for outgoing packets
244 * @node: qrtr_node that the packet is to be send to
245 * @dest_node: node id of the destination
246 * @dest_port: port number of the destination
247 * @type: type of message
249 * The flow control scheme is based around the low and high "watermarks". When
250 * the low watermark is passed the confirm_rx flag is set on the outgoing
251 * message, which will trigger the remote to send a control message of the type
252 * QRTR_TYPE_RESUME_TX to reset the counter. If the high watermark is hit
253 * further transmision should be paused.
255 * Return: 1 if confirm_rx should be set, 0 otherwise or errno failure
257 static int qrtr_tx_wait(struct qrtr_node *node, int dest_node, int dest_port,
260 unsigned long key = (u64)dest_node << 32 | dest_port;
261 struct qrtr_tx_flow *flow;
265 /* Never set confirm_rx on non-data packets */
266 if (type != QRTR_TYPE_DATA)
269 mutex_lock(&node->qrtr_tx_lock);
270 flow = radix_tree_lookup(&node->qrtr_tx_flow, key);
272 flow = kzalloc(sizeof(*flow), GFP_KERNEL);
274 init_waitqueue_head(&flow->resume_tx);
275 if (radix_tree_insert(&node->qrtr_tx_flow, key, flow)) {
281 mutex_unlock(&node->qrtr_tx_lock);
283 /* Set confirm_rx if we where unable to find and allocate a flow */
287 spin_lock_irq(&flow->resume_tx.lock);
288 ret = wait_event_interruptible_locked_irq(flow->resume_tx,
289 flow->pending < QRTR_TX_FLOW_HIGH ||
294 } else if (!node->ep) {
296 } else if (flow->tx_failed) {
301 confirm_rx = flow->pending == QRTR_TX_FLOW_LOW;
303 spin_unlock_irq(&flow->resume_tx.lock);
309 * qrtr_tx_flow_failed() - flag that tx of confirm_rx flagged messages failed
310 * @node: qrtr_node that the packet is to be send to
311 * @dest_node: node id of the destination
312 * @dest_port: port number of the destination
314 * Signal that the transmission of a message with confirm_rx flag failed. The
315 * flow's "pending" counter will keep incrementing towards QRTR_TX_FLOW_HIGH,
316 * at which point transmission would stall forever waiting for the resume TX
317 * message associated with the dropped confirm_rx message.
318 * Work around this by marking the flow as having a failed transmission and
319 * cause the next transmission attempt to be sent with the confirm_rx.
321 static void qrtr_tx_flow_failed(struct qrtr_node *node, int dest_node,
324 unsigned long key = (u64)dest_node << 32 | dest_port;
325 struct qrtr_tx_flow *flow;
328 flow = radix_tree_lookup(&node->qrtr_tx_flow, key);
331 spin_lock_irq(&flow->resume_tx.lock);
333 spin_unlock_irq(&flow->resume_tx.lock);
337 /* Pass an outgoing packet socket buffer to the endpoint driver. */
338 static int qrtr_node_enqueue(struct qrtr_node *node, struct sk_buff *skb,
339 int type, struct sockaddr_qrtr *from,
340 struct sockaddr_qrtr *to)
342 struct qrtr_hdr_v1 *hdr;
343 size_t len = skb->len;
346 confirm_rx = qrtr_tx_wait(node, to->sq_node, to->sq_port, type);
347 if (confirm_rx < 0) {
352 hdr = skb_push(skb, sizeof(*hdr));
353 hdr->version = cpu_to_le32(QRTR_PROTO_VER_1);
354 hdr->type = cpu_to_le32(type);
355 hdr->src_node_id = cpu_to_le32(from->sq_node);
356 hdr->src_port_id = cpu_to_le32(from->sq_port);
357 if (to->sq_port == QRTR_PORT_CTRL) {
358 hdr->dst_node_id = cpu_to_le32(node->nid);
359 hdr->dst_port_id = cpu_to_le32(QRTR_PORT_CTRL);
361 hdr->dst_node_id = cpu_to_le32(to->sq_node);
362 hdr->dst_port_id = cpu_to_le32(to->sq_port);
365 hdr->size = cpu_to_le32(len);
366 hdr->confirm_rx = !!confirm_rx;
368 rc = skb_put_padto(skb, ALIGN(len, 4) + sizeof(*hdr));
371 mutex_lock(&node->ep_lock);
374 rc = node->ep->xmit(node->ep, skb);
377 mutex_unlock(&node->ep_lock);
379 /* Need to ensure that a subsequent message carries the otherwise lost
380 * confirm_rx flag if we dropped this one */
381 if (rc && confirm_rx)
382 qrtr_tx_flow_failed(node, to->sq_node, to->sq_port);
387 /* Lookup node by id.
389 * callers must release with qrtr_node_release()
391 static struct qrtr_node *qrtr_node_lookup(unsigned int nid)
393 struct qrtr_node *node;
396 mutex_lock(&qrtr_node_lock);
397 spin_lock_irqsave(&qrtr_nodes_lock, flags);
398 node = radix_tree_lookup(&qrtr_nodes, nid);
399 node = qrtr_node_acquire(node);
400 spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
401 mutex_unlock(&qrtr_node_lock);
406 /* Assign node id to node.
408 * This is mostly useful for automatic node id assignment, based on
409 * the source id in the incoming packet.
411 static void qrtr_node_assign(struct qrtr_node *node, unsigned int nid)
415 if (nid == QRTR_EP_NID_AUTO)
418 spin_lock_irqsave(&qrtr_nodes_lock, flags);
419 radix_tree_insert(&qrtr_nodes, nid, node);
420 if (node->nid == QRTR_EP_NID_AUTO)
422 spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
426 * qrtr_endpoint_post() - post incoming data
427 * @ep: endpoint handle
428 * @data: data pointer
429 * @len: size of data in bytes
431 * Return: 0 on success; negative error code on failure
433 int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len)
435 struct qrtr_node *node = ep->node;
436 const struct qrtr_hdr_v1 *v1;
437 const struct qrtr_hdr_v2 *v2;
438 struct qrtr_sock *ipc;
445 if (len == 0 || len & 3)
448 skb = __netdev_alloc_skb(NULL, len, GFP_ATOMIC | __GFP_NOWARN);
452 cb = (struct qrtr_cb *)skb->cb;
454 /* Version field in v1 is little endian, so this works for both cases */
458 case QRTR_PROTO_VER_1:
459 if (len < sizeof(*v1))
462 hdrlen = sizeof(*v1);
464 cb->type = le32_to_cpu(v1->type);
465 cb->src_node = le32_to_cpu(v1->src_node_id);
466 cb->src_port = le32_to_cpu(v1->src_port_id);
467 cb->confirm_rx = !!v1->confirm_rx;
468 cb->dst_node = le32_to_cpu(v1->dst_node_id);
469 cb->dst_port = le32_to_cpu(v1->dst_port_id);
471 size = le32_to_cpu(v1->size);
473 case QRTR_PROTO_VER_2:
474 if (len < sizeof(*v2))
477 hdrlen = sizeof(*v2) + v2->optlen;
480 cb->confirm_rx = !!(v2->flags & QRTR_FLAGS_CONFIRM_RX);
481 cb->src_node = le16_to_cpu(v2->src_node_id);
482 cb->src_port = le16_to_cpu(v2->src_port_id);
483 cb->dst_node = le16_to_cpu(v2->dst_node_id);
484 cb->dst_port = le16_to_cpu(v2->dst_port_id);
486 if (cb->src_port == (u16)QRTR_PORT_CTRL)
487 cb->src_port = QRTR_PORT_CTRL;
488 if (cb->dst_port == (u16)QRTR_PORT_CTRL)
489 cb->dst_port = QRTR_PORT_CTRL;
491 size = le32_to_cpu(v2->size);
494 pr_err("qrtr: Invalid version %d\n", ver);
498 if (!size || len != ALIGN(size, 4) + hdrlen)
501 if ((cb->type == QRTR_TYPE_NEW_SERVER ||
502 cb->type == QRTR_TYPE_RESUME_TX) &&
503 size < sizeof(struct qrtr_ctrl_pkt))
506 if (cb->dst_port != QRTR_PORT_CTRL && cb->type != QRTR_TYPE_DATA &&
507 cb->type != QRTR_TYPE_RESUME_TX)
510 skb_put_data(skb, data + hdrlen, size);
512 qrtr_node_assign(node, cb->src_node);
514 if (cb->type == QRTR_TYPE_NEW_SERVER) {
515 /* Remote node endpoint can bridge other distant nodes */
516 const struct qrtr_ctrl_pkt *pkt;
519 qrtr_node_assign(node, le32_to_cpu(pkt->server.node));
522 if (cb->type == QRTR_TYPE_RESUME_TX) {
523 qrtr_tx_resume(node, skb);
525 ipc = qrtr_port_lookup(cb->dst_port);
529 if (sock_queue_rcv_skb(&ipc->sk, skb)) {
544 EXPORT_SYMBOL_GPL(qrtr_endpoint_post);
547 * qrtr_alloc_ctrl_packet() - allocate control packet skb
548 * @pkt: reference to qrtr_ctrl_pkt pointer
549 * @flags: the type of memory to allocate
551 * Returns newly allocated sk_buff, or NULL on failure
553 * This function allocates a sk_buff large enough to carry a qrtr_ctrl_pkt and
554 * on success returns a reference to the control packet in @pkt.
556 static struct sk_buff *qrtr_alloc_ctrl_packet(struct qrtr_ctrl_pkt **pkt,
559 const int pkt_len = sizeof(struct qrtr_ctrl_pkt);
562 skb = alloc_skb(QRTR_HDR_MAX_SIZE + pkt_len, flags);
566 skb_reserve(skb, QRTR_HDR_MAX_SIZE);
567 *pkt = skb_put_zero(skb, pkt_len);
573 * qrtr_endpoint_register() - register a new endpoint
574 * @ep: endpoint to register
575 * @nid: desired node id; may be QRTR_EP_NID_AUTO for auto-assignment
576 * Return: 0 on success; negative error code on failure
578 * The specified endpoint must have the xmit function pointer set on call.
580 int qrtr_endpoint_register(struct qrtr_endpoint *ep, unsigned int nid)
582 struct qrtr_node *node;
584 if (!ep || !ep->xmit)
587 node = kzalloc(sizeof(*node), GFP_KERNEL);
591 kref_init(&node->ref);
592 mutex_init(&node->ep_lock);
593 skb_queue_head_init(&node->rx_queue);
594 node->nid = QRTR_EP_NID_AUTO;
597 INIT_RADIX_TREE(&node->qrtr_tx_flow, GFP_KERNEL);
598 mutex_init(&node->qrtr_tx_lock);
600 qrtr_node_assign(node, nid);
602 mutex_lock(&qrtr_node_lock);
603 list_add(&node->item, &qrtr_all_nodes);
604 mutex_unlock(&qrtr_node_lock);
609 EXPORT_SYMBOL_GPL(qrtr_endpoint_register);
612 * qrtr_endpoint_unregister - unregister endpoint
613 * @ep: endpoint to unregister
615 void qrtr_endpoint_unregister(struct qrtr_endpoint *ep)
617 struct qrtr_node *node = ep->node;
618 struct sockaddr_qrtr src = {AF_QIPCRTR, node->nid, QRTR_PORT_CTRL};
619 struct sockaddr_qrtr dst = {AF_QIPCRTR, qrtr_local_nid, QRTR_PORT_CTRL};
620 struct radix_tree_iter iter;
621 struct qrtr_ctrl_pkt *pkt;
622 struct qrtr_tx_flow *flow;
627 mutex_lock(&node->ep_lock);
629 mutex_unlock(&node->ep_lock);
631 /* Notify the local controller about the event */
632 spin_lock_irqsave(&qrtr_nodes_lock, flags);
633 radix_tree_for_each_slot(slot, &qrtr_nodes, &iter, 0) {
636 src.sq_node = iter.index;
637 skb = qrtr_alloc_ctrl_packet(&pkt, GFP_ATOMIC);
639 pkt->cmd = cpu_to_le32(QRTR_TYPE_BYE);
640 qrtr_local_enqueue(NULL, skb, QRTR_TYPE_BYE, &src, &dst);
643 spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
645 /* Wake up any transmitters waiting for resume-tx from the node */
646 mutex_lock(&node->qrtr_tx_lock);
647 radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) {
649 wake_up_interruptible_all(&flow->resume_tx);
651 mutex_unlock(&node->qrtr_tx_lock);
653 qrtr_node_release(node);
656 EXPORT_SYMBOL_GPL(qrtr_endpoint_unregister);
658 /* Lookup socket by port.
660 * Callers must release with qrtr_port_put()
662 static struct qrtr_sock *qrtr_port_lookup(int port)
664 struct qrtr_sock *ipc;
666 if (port == QRTR_PORT_CTRL)
670 ipc = xa_load(&qrtr_ports, port);
678 /* Release acquired socket. */
679 static void qrtr_port_put(struct qrtr_sock *ipc)
684 /* Remove port assignment. */
685 static void qrtr_port_remove(struct qrtr_sock *ipc)
687 struct qrtr_ctrl_pkt *pkt;
689 int port = ipc->us.sq_port;
690 struct sockaddr_qrtr to;
692 to.sq_family = AF_QIPCRTR;
693 to.sq_node = QRTR_NODE_BCAST;
694 to.sq_port = QRTR_PORT_CTRL;
696 skb = qrtr_alloc_ctrl_packet(&pkt, GFP_KERNEL);
698 pkt->cmd = cpu_to_le32(QRTR_TYPE_DEL_CLIENT);
699 pkt->client.node = cpu_to_le32(ipc->us.sq_node);
700 pkt->client.port = cpu_to_le32(ipc->us.sq_port);
702 skb_set_owner_w(skb, &ipc->sk);
703 qrtr_bcast_enqueue(NULL, skb, QRTR_TYPE_DEL_CLIENT, &ipc->us,
707 if (port == QRTR_PORT_CTRL)
710 __sock_put(&ipc->sk);
712 xa_erase(&qrtr_ports, port);
714 /* Ensure that if qrtr_port_lookup() did enter the RCU read section we
715 * wait for it to up increment the refcount */
719 /* Assign port number to socket.
721 * Specify port in the integer pointed to by port, and it will be adjusted
722 * on return as necesssary.
725 * 0: Assign ephemeral port in [QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET]
726 * <QRTR_MIN_EPH_SOCKET: Specified; requires CAP_NET_ADMIN
727 * >QRTR_MIN_EPH_SOCKET: Specified; available to all
729 static int qrtr_port_assign(struct qrtr_sock *ipc, int *port)
734 rc = xa_alloc(&qrtr_ports, port, ipc, QRTR_EPH_PORT_RANGE,
736 } else if (*port < QRTR_MIN_EPH_SOCKET && !capable(CAP_NET_ADMIN)) {
738 } else if (*port == QRTR_PORT_CTRL) {
739 rc = xa_insert(&qrtr_ports, 0, ipc, GFP_KERNEL);
741 rc = xa_insert(&qrtr_ports, *port, ipc, GFP_KERNEL);
754 /* Reset all non-control ports */
755 static void qrtr_reset_ports(void)
757 struct qrtr_sock *ipc;
761 xa_for_each_start(&qrtr_ports, index, ipc, 1) {
763 ipc->sk.sk_err = ENETRESET;
764 sk_error_report(&ipc->sk);
770 /* Bind socket to address.
772 * Socket should be locked upon call.
774 static int __qrtr_bind(struct socket *sock,
775 const struct sockaddr_qrtr *addr, int zapped)
777 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
778 struct sock *sk = sock->sk;
783 if (!zapped && addr->sq_port == ipc->us.sq_port)
786 port = addr->sq_port;
787 rc = qrtr_port_assign(ipc, &port);
791 /* unbind previous, if any */
793 qrtr_port_remove(ipc);
794 ipc->us.sq_port = port;
796 sock_reset_flag(sk, SOCK_ZAPPED);
798 /* Notify all open ports about the new controller */
799 if (port == QRTR_PORT_CTRL)
805 /* Auto bind to an ephemeral port. */
806 static int qrtr_autobind(struct socket *sock)
808 struct sock *sk = sock->sk;
809 struct sockaddr_qrtr addr;
811 if (!sock_flag(sk, SOCK_ZAPPED))
814 addr.sq_family = AF_QIPCRTR;
815 addr.sq_node = qrtr_local_nid;
818 return __qrtr_bind(sock, &addr, 1);
821 /* Bind socket to specified sockaddr. */
822 static int qrtr_bind(struct socket *sock, struct sockaddr *saddr, int len)
824 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr);
825 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
826 struct sock *sk = sock->sk;
829 if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR)
832 if (addr->sq_node != ipc->us.sq_node)
836 rc = __qrtr_bind(sock, addr, sock_flag(sk, SOCK_ZAPPED));
842 /* Queue packet to local peer socket. */
843 static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb,
844 int type, struct sockaddr_qrtr *from,
845 struct sockaddr_qrtr *to)
847 struct qrtr_sock *ipc;
850 ipc = qrtr_port_lookup(to->sq_port);
851 if (!ipc || &ipc->sk == skb->sk) { /* do not send to self */
858 cb = (struct qrtr_cb *)skb->cb;
859 cb->src_node = from->sq_node;
860 cb->src_port = from->sq_port;
862 if (sock_queue_rcv_skb(&ipc->sk, skb)) {
873 /* Queue packet for broadcast. */
874 static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb,
875 int type, struct sockaddr_qrtr *from,
876 struct sockaddr_qrtr *to)
878 struct sk_buff *skbn;
880 mutex_lock(&qrtr_node_lock);
881 list_for_each_entry(node, &qrtr_all_nodes, item) {
882 skbn = skb_clone(skb, GFP_KERNEL);
885 skb_set_owner_w(skbn, skb->sk);
886 qrtr_node_enqueue(node, skbn, type, from, to);
888 mutex_unlock(&qrtr_node_lock);
890 qrtr_local_enqueue(NULL, skb, type, from, to);
895 static int qrtr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
897 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name);
898 int (*enqueue_fn)(struct qrtr_node *, struct sk_buff *, int,
899 struct sockaddr_qrtr *, struct sockaddr_qrtr *);
900 __le32 qrtr_type = cpu_to_le32(QRTR_TYPE_DATA);
901 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
902 struct sock *sk = sock->sk;
903 struct qrtr_node *node;
909 if (msg->msg_flags & ~(MSG_DONTWAIT))
918 if (msg->msg_namelen < sizeof(*addr)) {
923 if (addr->sq_family != AF_QIPCRTR) {
928 rc = qrtr_autobind(sock);
933 } else if (sk->sk_state == TCP_ESTABLISHED) {
941 if (addr->sq_node == QRTR_NODE_BCAST) {
942 if (addr->sq_port != QRTR_PORT_CTRL &&
943 qrtr_local_nid != QRTR_NODE_BCAST) {
947 enqueue_fn = qrtr_bcast_enqueue;
948 } else if (addr->sq_node == ipc->us.sq_node) {
949 enqueue_fn = qrtr_local_enqueue;
951 node = qrtr_node_lookup(addr->sq_node);
956 enqueue_fn = qrtr_node_enqueue;
959 plen = (len + 3) & ~3;
960 skb = sock_alloc_send_skb(sk, plen + QRTR_HDR_MAX_SIZE,
961 msg->msg_flags & MSG_DONTWAIT, &rc);
967 skb_reserve(skb, QRTR_HDR_MAX_SIZE);
969 rc = memcpy_from_msg(skb_put(skb, len), msg, len);
975 if (ipc->us.sq_port == QRTR_PORT_CTRL) {
982 /* control messages already require the type as 'command' */
983 skb_copy_bits(skb, 0, &qrtr_type, 4);
986 type = le32_to_cpu(qrtr_type);
987 rc = enqueue_fn(node, skb, type, &ipc->us, addr);
992 qrtr_node_release(node);
998 static int qrtr_send_resume_tx(struct qrtr_cb *cb)
1000 struct sockaddr_qrtr remote = { AF_QIPCRTR, cb->src_node, cb->src_port };
1001 struct sockaddr_qrtr local = { AF_QIPCRTR, cb->dst_node, cb->dst_port };
1002 struct qrtr_ctrl_pkt *pkt;
1003 struct qrtr_node *node;
1004 struct sk_buff *skb;
1007 node = qrtr_node_lookup(remote.sq_node);
1011 skb = qrtr_alloc_ctrl_packet(&pkt, GFP_KERNEL);
1015 pkt->cmd = cpu_to_le32(QRTR_TYPE_RESUME_TX);
1016 pkt->client.node = cpu_to_le32(cb->dst_node);
1017 pkt->client.port = cpu_to_le32(cb->dst_port);
1019 ret = qrtr_node_enqueue(node, skb, QRTR_TYPE_RESUME_TX, &local, &remote);
1021 qrtr_node_release(node);
1026 static int qrtr_recvmsg(struct socket *sock, struct msghdr *msg,
1027 size_t size, int flags)
1029 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name);
1030 struct sock *sk = sock->sk;
1031 struct sk_buff *skb;
1037 if (sock_flag(sk, SOCK_ZAPPED)) {
1039 return -EADDRNOTAVAIL;
1042 skb = skb_recv_datagram(sk, flags, &rc);
1047 cb = (struct qrtr_cb *)skb->cb;
1050 if (copied > size) {
1052 msg->msg_flags |= MSG_TRUNC;
1055 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1061 /* There is an anonymous 2-byte hole after sq_family,
1062 * make sure to clear it.
1064 memset(addr, 0, sizeof(*addr));
1066 addr->sq_family = AF_QIPCRTR;
1067 addr->sq_node = cb->src_node;
1068 addr->sq_port = cb->src_port;
1069 msg->msg_namelen = sizeof(*addr);
1074 qrtr_send_resume_tx(cb);
1076 skb_free_datagram(sk, skb);
1082 static int qrtr_connect(struct socket *sock, struct sockaddr *saddr,
1085 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr);
1086 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
1087 struct sock *sk = sock->sk;
1090 if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR)
1095 sk->sk_state = TCP_CLOSE;
1096 sock->state = SS_UNCONNECTED;
1098 rc = qrtr_autobind(sock);
1105 sock->state = SS_CONNECTED;
1106 sk->sk_state = TCP_ESTABLISHED;
1113 static int qrtr_getname(struct socket *sock, struct sockaddr *saddr,
1116 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
1117 struct sockaddr_qrtr qaddr;
1118 struct sock *sk = sock->sk;
1122 if (sk->sk_state != TCP_ESTABLISHED) {
1133 qaddr.sq_family = AF_QIPCRTR;
1135 memcpy(saddr, &qaddr, sizeof(qaddr));
1137 return sizeof(qaddr);
1140 static int qrtr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1142 void __user *argp = (void __user *)arg;
1143 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
1144 struct sock *sk = sock->sk;
1145 struct sockaddr_qrtr *sq;
1146 struct sk_buff *skb;
1155 len = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1158 rc = put_user(len, (int __user *)argp);
1161 skb = skb_peek(&sk->sk_receive_queue);
1164 rc = put_user(len, (int __user *)argp);
1167 if (get_user_ifreq(&ifr, NULL, argp)) {
1172 sq = (struct sockaddr_qrtr *)&ifr.ifr_addr;
1174 if (put_user_ifreq(&ifr, argp)) {
1182 case SIOCGIFDSTADDR:
1183 case SIOCSIFDSTADDR:
1184 case SIOCGIFBRDADDR:
1185 case SIOCSIFBRDADDR:
1186 case SIOCGIFNETMASK:
1187 case SIOCSIFNETMASK:
1200 static int qrtr_release(struct socket *sock)
1202 struct sock *sk = sock->sk;
1203 struct qrtr_sock *ipc;
1211 sk->sk_shutdown = SHUTDOWN_MASK;
1212 if (!sock_flag(sk, SOCK_DEAD))
1213 sk->sk_state_change(sk);
1215 sock_set_flag(sk, SOCK_DEAD);
1219 if (!sock_flag(sk, SOCK_ZAPPED))
1220 qrtr_port_remove(ipc);
1222 skb_queue_purge(&sk->sk_receive_queue);
1230 static const struct proto_ops qrtr_proto_ops = {
1231 .owner = THIS_MODULE,
1232 .family = AF_QIPCRTR,
1234 .connect = qrtr_connect,
1235 .socketpair = sock_no_socketpair,
1236 .accept = sock_no_accept,
1237 .listen = sock_no_listen,
1238 .sendmsg = qrtr_sendmsg,
1239 .recvmsg = qrtr_recvmsg,
1240 .getname = qrtr_getname,
1241 .ioctl = qrtr_ioctl,
1242 .gettstamp = sock_gettstamp,
1243 .poll = datagram_poll,
1244 .shutdown = sock_no_shutdown,
1245 .release = qrtr_release,
1246 .mmap = sock_no_mmap,
1247 .sendpage = sock_no_sendpage,
1250 static struct proto qrtr_proto = {
1252 .owner = THIS_MODULE,
1253 .obj_size = sizeof(struct qrtr_sock),
1256 static int qrtr_create(struct net *net, struct socket *sock,
1257 int protocol, int kern)
1259 struct qrtr_sock *ipc;
1262 if (sock->type != SOCK_DGRAM)
1265 sk = sk_alloc(net, AF_QIPCRTR, GFP_KERNEL, &qrtr_proto, kern);
1269 sock_set_flag(sk, SOCK_ZAPPED);
1271 sock_init_data(sock, sk);
1272 sock->ops = &qrtr_proto_ops;
1275 ipc->us.sq_family = AF_QIPCRTR;
1276 ipc->us.sq_node = qrtr_local_nid;
1277 ipc->us.sq_port = 0;
1282 static const struct net_proto_family qrtr_family = {
1283 .owner = THIS_MODULE,
1284 .family = AF_QIPCRTR,
1285 .create = qrtr_create,
1288 static int __init qrtr_proto_init(void)
1292 rc = proto_register(&qrtr_proto, 1);
1296 rc = sock_register(&qrtr_family);
1300 rc = qrtr_ns_init();
1307 sock_unregister(qrtr_family.family);
1309 proto_unregister(&qrtr_proto);
1312 postcore_initcall(qrtr_proto_init);
1314 static void __exit qrtr_proto_fini(void)
1317 sock_unregister(qrtr_family.family);
1318 proto_unregister(&qrtr_proto);
1320 module_exit(qrtr_proto_fini);
1322 MODULE_DESCRIPTION("Qualcomm IPC-router driver");
1323 MODULE_LICENSE("GPL v2");
1324 MODULE_ALIAS_NETPROTO(PF_QIPCRTR);