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 (node->nid != QRTR_EP_NID_AUTO)
176 radix_tree_delete(&qrtr_nodes, node->nid);
177 spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
179 list_del(&node->item);
180 mutex_unlock(&qrtr_node_lock);
182 skb_queue_purge(&node->rx_queue);
184 /* Free tx flow counters */
185 radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) {
187 radix_tree_iter_delete(&node->qrtr_tx_flow, &iter, slot);
193 /* Increment reference to node. */
194 static struct qrtr_node *qrtr_node_acquire(struct qrtr_node *node)
197 kref_get(&node->ref);
201 /* Decrement reference to node and release as necessary. */
202 static void qrtr_node_release(struct qrtr_node *node)
206 kref_put_mutex(&node->ref, __qrtr_node_release, &qrtr_node_lock);
210 * qrtr_tx_resume() - reset flow control counter
211 * @node: qrtr_node that the QRTR_TYPE_RESUME_TX packet arrived on
212 * @skb: resume_tx packet
214 static void qrtr_tx_resume(struct qrtr_node *node, struct sk_buff *skb)
216 struct qrtr_ctrl_pkt *pkt = (struct qrtr_ctrl_pkt *)skb->data;
217 u64 remote_node = le32_to_cpu(pkt->client.node);
218 u32 remote_port = le32_to_cpu(pkt->client.port);
219 struct qrtr_tx_flow *flow;
222 key = remote_node << 32 | remote_port;
225 flow = radix_tree_lookup(&node->qrtr_tx_flow, key);
228 spin_lock(&flow->resume_tx.lock);
230 spin_unlock(&flow->resume_tx.lock);
231 wake_up_interruptible_all(&flow->resume_tx);
238 * qrtr_tx_wait() - flow control for outgoing packets
239 * @node: qrtr_node that the packet is to be send to
240 * @dest_node: node id of the destination
241 * @dest_port: port number of the destination
242 * @type: type of message
244 * The flow control scheme is based around the low and high "watermarks". When
245 * the low watermark is passed the confirm_rx flag is set on the outgoing
246 * message, which will trigger the remote to send a control message of the type
247 * QRTR_TYPE_RESUME_TX to reset the counter. If the high watermark is hit
248 * further transmision should be paused.
250 * Return: 1 if confirm_rx should be set, 0 otherwise or errno failure
252 static int qrtr_tx_wait(struct qrtr_node *node, int dest_node, int dest_port,
255 unsigned long key = (u64)dest_node << 32 | dest_port;
256 struct qrtr_tx_flow *flow;
260 /* Never set confirm_rx on non-data packets */
261 if (type != QRTR_TYPE_DATA)
264 mutex_lock(&node->qrtr_tx_lock);
265 flow = radix_tree_lookup(&node->qrtr_tx_flow, key);
267 flow = kzalloc(sizeof(*flow), GFP_KERNEL);
269 init_waitqueue_head(&flow->resume_tx);
270 if (radix_tree_insert(&node->qrtr_tx_flow, key, flow)) {
276 mutex_unlock(&node->qrtr_tx_lock);
278 /* Set confirm_rx if we where unable to find and allocate a flow */
282 spin_lock_irq(&flow->resume_tx.lock);
283 ret = wait_event_interruptible_locked_irq(flow->resume_tx,
284 flow->pending < QRTR_TX_FLOW_HIGH ||
289 } else if (!node->ep) {
291 } else if (flow->tx_failed) {
296 confirm_rx = flow->pending == QRTR_TX_FLOW_LOW;
298 spin_unlock_irq(&flow->resume_tx.lock);
304 * qrtr_tx_flow_failed() - flag that tx of confirm_rx flagged messages failed
305 * @node: qrtr_node that the packet is to be send to
306 * @dest_node: node id of the destination
307 * @dest_port: port number of the destination
309 * Signal that the transmission of a message with confirm_rx flag failed. The
310 * flow's "pending" counter will keep incrementing towards QRTR_TX_FLOW_HIGH,
311 * at which point transmission would stall forever waiting for the resume TX
312 * message associated with the dropped confirm_rx message.
313 * Work around this by marking the flow as having a failed transmission and
314 * cause the next transmission attempt to be sent with the confirm_rx.
316 static void qrtr_tx_flow_failed(struct qrtr_node *node, int dest_node,
319 unsigned long key = (u64)dest_node << 32 | dest_port;
320 struct qrtr_tx_flow *flow;
323 flow = radix_tree_lookup(&node->qrtr_tx_flow, key);
326 spin_lock_irq(&flow->resume_tx.lock);
328 spin_unlock_irq(&flow->resume_tx.lock);
332 /* Pass an outgoing packet socket buffer to the endpoint driver. */
333 static int qrtr_node_enqueue(struct qrtr_node *node, struct sk_buff *skb,
334 int type, struct sockaddr_qrtr *from,
335 struct sockaddr_qrtr *to)
337 struct qrtr_hdr_v1 *hdr;
338 size_t len = skb->len;
341 confirm_rx = qrtr_tx_wait(node, to->sq_node, to->sq_port, type);
342 if (confirm_rx < 0) {
347 hdr = skb_push(skb, sizeof(*hdr));
348 hdr->version = cpu_to_le32(QRTR_PROTO_VER_1);
349 hdr->type = cpu_to_le32(type);
350 hdr->src_node_id = cpu_to_le32(from->sq_node);
351 hdr->src_port_id = cpu_to_le32(from->sq_port);
352 if (to->sq_port == QRTR_PORT_CTRL) {
353 hdr->dst_node_id = cpu_to_le32(node->nid);
354 hdr->dst_port_id = cpu_to_le32(QRTR_PORT_CTRL);
356 hdr->dst_node_id = cpu_to_le32(to->sq_node);
357 hdr->dst_port_id = cpu_to_le32(to->sq_port);
360 hdr->size = cpu_to_le32(len);
361 hdr->confirm_rx = !!confirm_rx;
363 rc = skb_put_padto(skb, ALIGN(len, 4) + sizeof(*hdr));
366 mutex_lock(&node->ep_lock);
369 rc = node->ep->xmit(node->ep, skb);
372 mutex_unlock(&node->ep_lock);
374 /* Need to ensure that a subsequent message carries the otherwise lost
375 * confirm_rx flag if we dropped this one */
376 if (rc && confirm_rx)
377 qrtr_tx_flow_failed(node, to->sq_node, to->sq_port);
382 /* Lookup node by id.
384 * callers must release with qrtr_node_release()
386 static struct qrtr_node *qrtr_node_lookup(unsigned int nid)
388 struct qrtr_node *node;
391 mutex_lock(&qrtr_node_lock);
392 spin_lock_irqsave(&qrtr_nodes_lock, flags);
393 node = radix_tree_lookup(&qrtr_nodes, nid);
394 node = qrtr_node_acquire(node);
395 spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
396 mutex_unlock(&qrtr_node_lock);
401 /* Assign node id to node.
403 * This is mostly useful for automatic node id assignment, based on
404 * the source id in the incoming packet.
406 static void qrtr_node_assign(struct qrtr_node *node, unsigned int nid)
410 if (node->nid != QRTR_EP_NID_AUTO || nid == QRTR_EP_NID_AUTO)
413 spin_lock_irqsave(&qrtr_nodes_lock, flags);
414 radix_tree_insert(&qrtr_nodes, nid, node);
416 spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
420 * qrtr_endpoint_post() - post incoming data
421 * @ep: endpoint handle
422 * @data: data pointer
423 * @len: size of data in bytes
425 * Return: 0 on success; negative error code on failure
427 int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len)
429 struct qrtr_node *node = ep->node;
430 const struct qrtr_hdr_v1 *v1;
431 const struct qrtr_hdr_v2 *v2;
432 struct qrtr_sock *ipc;
439 if (len == 0 || len & 3)
442 skb = __netdev_alloc_skb(NULL, len, GFP_ATOMIC | __GFP_NOWARN);
446 cb = (struct qrtr_cb *)skb->cb;
448 /* Version field in v1 is little endian, so this works for both cases */
452 case QRTR_PROTO_VER_1:
453 if (len < sizeof(*v1))
456 hdrlen = sizeof(*v1);
458 cb->type = le32_to_cpu(v1->type);
459 cb->src_node = le32_to_cpu(v1->src_node_id);
460 cb->src_port = le32_to_cpu(v1->src_port_id);
461 cb->confirm_rx = !!v1->confirm_rx;
462 cb->dst_node = le32_to_cpu(v1->dst_node_id);
463 cb->dst_port = le32_to_cpu(v1->dst_port_id);
465 size = le32_to_cpu(v1->size);
467 case QRTR_PROTO_VER_2:
468 if (len < sizeof(*v2))
471 hdrlen = sizeof(*v2) + v2->optlen;
474 cb->confirm_rx = !!(v2->flags & QRTR_FLAGS_CONFIRM_RX);
475 cb->src_node = le16_to_cpu(v2->src_node_id);
476 cb->src_port = le16_to_cpu(v2->src_port_id);
477 cb->dst_node = le16_to_cpu(v2->dst_node_id);
478 cb->dst_port = le16_to_cpu(v2->dst_port_id);
480 if (cb->src_port == (u16)QRTR_PORT_CTRL)
481 cb->src_port = QRTR_PORT_CTRL;
482 if (cb->dst_port == (u16)QRTR_PORT_CTRL)
483 cb->dst_port = QRTR_PORT_CTRL;
485 size = le32_to_cpu(v2->size);
488 pr_err("qrtr: Invalid version %d\n", ver);
492 if (!size || len != ALIGN(size, 4) + hdrlen)
495 if ((cb->type == QRTR_TYPE_NEW_SERVER ||
496 cb->type == QRTR_TYPE_RESUME_TX) &&
497 size < sizeof(struct qrtr_ctrl_pkt))
500 if (cb->dst_port != QRTR_PORT_CTRL && cb->type != QRTR_TYPE_DATA &&
501 cb->type != QRTR_TYPE_RESUME_TX)
504 skb_put_data(skb, data + hdrlen, size);
506 qrtr_node_assign(node, cb->src_node);
508 if (cb->type == QRTR_TYPE_NEW_SERVER) {
509 /* Remote node endpoint can bridge other distant nodes */
510 const struct qrtr_ctrl_pkt *pkt;
513 qrtr_node_assign(node, le32_to_cpu(pkt->server.node));
516 if (cb->type == QRTR_TYPE_RESUME_TX) {
517 qrtr_tx_resume(node, skb);
519 ipc = qrtr_port_lookup(cb->dst_port);
523 if (sock_queue_rcv_skb(&ipc->sk, skb)) {
538 EXPORT_SYMBOL_GPL(qrtr_endpoint_post);
541 * qrtr_alloc_ctrl_packet() - allocate control packet skb
542 * @pkt: reference to qrtr_ctrl_pkt pointer
544 * Returns newly allocated sk_buff, or NULL on failure
546 * This function allocates a sk_buff large enough to carry a qrtr_ctrl_pkt and
547 * on success returns a reference to the control packet in @pkt.
549 static struct sk_buff *qrtr_alloc_ctrl_packet(struct qrtr_ctrl_pkt **pkt)
551 const int pkt_len = sizeof(struct qrtr_ctrl_pkt);
554 skb = alloc_skb(QRTR_HDR_MAX_SIZE + pkt_len, GFP_KERNEL);
558 skb_reserve(skb, QRTR_HDR_MAX_SIZE);
559 *pkt = skb_put_zero(skb, pkt_len);
565 * qrtr_endpoint_register() - register a new endpoint
566 * @ep: endpoint to register
567 * @nid: desired node id; may be QRTR_EP_NID_AUTO for auto-assignment
568 * Return: 0 on success; negative error code on failure
570 * The specified endpoint must have the xmit function pointer set on call.
572 int qrtr_endpoint_register(struct qrtr_endpoint *ep, unsigned int nid)
574 struct qrtr_node *node;
576 if (!ep || !ep->xmit)
579 node = kzalloc(sizeof(*node), GFP_KERNEL);
583 kref_init(&node->ref);
584 mutex_init(&node->ep_lock);
585 skb_queue_head_init(&node->rx_queue);
586 node->nid = QRTR_EP_NID_AUTO;
589 INIT_RADIX_TREE(&node->qrtr_tx_flow, GFP_KERNEL);
590 mutex_init(&node->qrtr_tx_lock);
592 qrtr_node_assign(node, nid);
594 mutex_lock(&qrtr_node_lock);
595 list_add(&node->item, &qrtr_all_nodes);
596 mutex_unlock(&qrtr_node_lock);
601 EXPORT_SYMBOL_GPL(qrtr_endpoint_register);
604 * qrtr_endpoint_unregister - unregister endpoint
605 * @ep: endpoint to unregister
607 void qrtr_endpoint_unregister(struct qrtr_endpoint *ep)
609 struct qrtr_node *node = ep->node;
610 struct sockaddr_qrtr src = {AF_QIPCRTR, node->nid, QRTR_PORT_CTRL};
611 struct sockaddr_qrtr dst = {AF_QIPCRTR, qrtr_local_nid, QRTR_PORT_CTRL};
612 struct radix_tree_iter iter;
613 struct qrtr_ctrl_pkt *pkt;
614 struct qrtr_tx_flow *flow;
618 mutex_lock(&node->ep_lock);
620 mutex_unlock(&node->ep_lock);
622 /* Notify the local controller about the event */
623 skb = qrtr_alloc_ctrl_packet(&pkt);
625 pkt->cmd = cpu_to_le32(QRTR_TYPE_BYE);
626 qrtr_local_enqueue(NULL, skb, QRTR_TYPE_BYE, &src, &dst);
629 /* Wake up any transmitters waiting for resume-tx from the node */
630 mutex_lock(&node->qrtr_tx_lock);
631 radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) {
633 wake_up_interruptible_all(&flow->resume_tx);
635 mutex_unlock(&node->qrtr_tx_lock);
637 qrtr_node_release(node);
640 EXPORT_SYMBOL_GPL(qrtr_endpoint_unregister);
642 /* Lookup socket by port.
644 * Callers must release with qrtr_port_put()
646 static struct qrtr_sock *qrtr_port_lookup(int port)
648 struct qrtr_sock *ipc;
650 if (port == QRTR_PORT_CTRL)
654 ipc = xa_load(&qrtr_ports, port);
662 /* Release acquired socket. */
663 static void qrtr_port_put(struct qrtr_sock *ipc)
668 /* Remove port assignment. */
669 static void qrtr_port_remove(struct qrtr_sock *ipc)
671 struct qrtr_ctrl_pkt *pkt;
673 int port = ipc->us.sq_port;
674 struct sockaddr_qrtr to;
676 to.sq_family = AF_QIPCRTR;
677 to.sq_node = QRTR_NODE_BCAST;
678 to.sq_port = QRTR_PORT_CTRL;
680 skb = qrtr_alloc_ctrl_packet(&pkt);
682 pkt->cmd = cpu_to_le32(QRTR_TYPE_DEL_CLIENT);
683 pkt->client.node = cpu_to_le32(ipc->us.sq_node);
684 pkt->client.port = cpu_to_le32(ipc->us.sq_port);
686 skb_set_owner_w(skb, &ipc->sk);
687 qrtr_bcast_enqueue(NULL, skb, QRTR_TYPE_DEL_CLIENT, &ipc->us,
691 if (port == QRTR_PORT_CTRL)
694 __sock_put(&ipc->sk);
696 xa_erase(&qrtr_ports, port);
698 /* Ensure that if qrtr_port_lookup() did enter the RCU read section we
699 * wait for it to up increment the refcount */
703 /* Assign port number to socket.
705 * Specify port in the integer pointed to by port, and it will be adjusted
706 * on return as necesssary.
709 * 0: Assign ephemeral port in [QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET]
710 * <QRTR_MIN_EPH_SOCKET: Specified; requires CAP_NET_ADMIN
711 * >QRTR_MIN_EPH_SOCKET: Specified; available to all
713 static int qrtr_port_assign(struct qrtr_sock *ipc, int *port)
718 rc = xa_alloc(&qrtr_ports, port, ipc, QRTR_EPH_PORT_RANGE,
720 } else if (*port < QRTR_MIN_EPH_SOCKET && !capable(CAP_NET_ADMIN)) {
722 } else if (*port == QRTR_PORT_CTRL) {
723 rc = xa_insert(&qrtr_ports, 0, ipc, GFP_KERNEL);
725 rc = xa_insert(&qrtr_ports, *port, ipc, GFP_KERNEL);
738 /* Reset all non-control ports */
739 static void qrtr_reset_ports(void)
741 struct qrtr_sock *ipc;
745 xa_for_each_start(&qrtr_ports, index, ipc, 1) {
747 ipc->sk.sk_err = ENETRESET;
748 ipc->sk.sk_error_report(&ipc->sk);
754 /* Bind socket to address.
756 * Socket should be locked upon call.
758 static int __qrtr_bind(struct socket *sock,
759 const struct sockaddr_qrtr *addr, int zapped)
761 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
762 struct sock *sk = sock->sk;
767 if (!zapped && addr->sq_port == ipc->us.sq_port)
770 port = addr->sq_port;
771 rc = qrtr_port_assign(ipc, &port);
775 /* unbind previous, if any */
777 qrtr_port_remove(ipc);
778 ipc->us.sq_port = port;
780 sock_reset_flag(sk, SOCK_ZAPPED);
782 /* Notify all open ports about the new controller */
783 if (port == QRTR_PORT_CTRL)
789 /* Auto bind to an ephemeral port. */
790 static int qrtr_autobind(struct socket *sock)
792 struct sock *sk = sock->sk;
793 struct sockaddr_qrtr addr;
795 if (!sock_flag(sk, SOCK_ZAPPED))
798 addr.sq_family = AF_QIPCRTR;
799 addr.sq_node = qrtr_local_nid;
802 return __qrtr_bind(sock, &addr, 1);
805 /* Bind socket to specified sockaddr. */
806 static int qrtr_bind(struct socket *sock, struct sockaddr *saddr, int len)
808 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr);
809 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
810 struct sock *sk = sock->sk;
813 if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR)
816 if (addr->sq_node != ipc->us.sq_node)
820 rc = __qrtr_bind(sock, addr, sock_flag(sk, SOCK_ZAPPED));
826 /* Queue packet to local peer socket. */
827 static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb,
828 int type, struct sockaddr_qrtr *from,
829 struct sockaddr_qrtr *to)
831 struct qrtr_sock *ipc;
834 ipc = qrtr_port_lookup(to->sq_port);
835 if (!ipc || &ipc->sk == skb->sk) { /* do not send to self */
842 cb = (struct qrtr_cb *)skb->cb;
843 cb->src_node = from->sq_node;
844 cb->src_port = from->sq_port;
846 if (sock_queue_rcv_skb(&ipc->sk, skb)) {
857 /* Queue packet for broadcast. */
858 static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb,
859 int type, struct sockaddr_qrtr *from,
860 struct sockaddr_qrtr *to)
862 struct sk_buff *skbn;
864 mutex_lock(&qrtr_node_lock);
865 list_for_each_entry(node, &qrtr_all_nodes, item) {
866 skbn = skb_clone(skb, GFP_KERNEL);
869 skb_set_owner_w(skbn, skb->sk);
870 qrtr_node_enqueue(node, skbn, type, from, to);
872 mutex_unlock(&qrtr_node_lock);
874 qrtr_local_enqueue(NULL, skb, type, from, to);
879 static int qrtr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
881 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name);
882 int (*enqueue_fn)(struct qrtr_node *, struct sk_buff *, int,
883 struct sockaddr_qrtr *, struct sockaddr_qrtr *);
884 __le32 qrtr_type = cpu_to_le32(QRTR_TYPE_DATA);
885 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
886 struct sock *sk = sock->sk;
887 struct qrtr_node *node;
893 if (msg->msg_flags & ~(MSG_DONTWAIT))
902 if (msg->msg_namelen < sizeof(*addr)) {
907 if (addr->sq_family != AF_QIPCRTR) {
912 rc = qrtr_autobind(sock);
917 } else if (sk->sk_state == TCP_ESTABLISHED) {
925 if (addr->sq_node == QRTR_NODE_BCAST) {
926 if (addr->sq_port != QRTR_PORT_CTRL &&
927 qrtr_local_nid != QRTR_NODE_BCAST) {
931 enqueue_fn = qrtr_bcast_enqueue;
932 } else if (addr->sq_node == ipc->us.sq_node) {
933 enqueue_fn = qrtr_local_enqueue;
935 node = qrtr_node_lookup(addr->sq_node);
940 enqueue_fn = qrtr_node_enqueue;
943 plen = (len + 3) & ~3;
944 skb = sock_alloc_send_skb(sk, plen + QRTR_HDR_MAX_SIZE,
945 msg->msg_flags & MSG_DONTWAIT, &rc);
951 skb_reserve(skb, QRTR_HDR_MAX_SIZE);
953 rc = memcpy_from_msg(skb_put(skb, len), msg, len);
959 if (ipc->us.sq_port == QRTR_PORT_CTRL) {
966 /* control messages already require the type as 'command' */
967 skb_copy_bits(skb, 0, &qrtr_type, 4);
970 type = le32_to_cpu(qrtr_type);
971 rc = enqueue_fn(node, skb, type, &ipc->us, addr);
976 qrtr_node_release(node);
982 static int qrtr_send_resume_tx(struct qrtr_cb *cb)
984 struct sockaddr_qrtr remote = { AF_QIPCRTR, cb->src_node, cb->src_port };
985 struct sockaddr_qrtr local = { AF_QIPCRTR, cb->dst_node, cb->dst_port };
986 struct qrtr_ctrl_pkt *pkt;
987 struct qrtr_node *node;
991 node = qrtr_node_lookup(remote.sq_node);
995 skb = qrtr_alloc_ctrl_packet(&pkt);
999 pkt->cmd = cpu_to_le32(QRTR_TYPE_RESUME_TX);
1000 pkt->client.node = cpu_to_le32(cb->dst_node);
1001 pkt->client.port = cpu_to_le32(cb->dst_port);
1003 ret = qrtr_node_enqueue(node, skb, QRTR_TYPE_RESUME_TX, &local, &remote);
1005 qrtr_node_release(node);
1010 static int qrtr_recvmsg(struct socket *sock, struct msghdr *msg,
1011 size_t size, int flags)
1013 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name);
1014 struct sock *sk = sock->sk;
1015 struct sk_buff *skb;
1021 if (sock_flag(sk, SOCK_ZAPPED)) {
1023 return -EADDRNOTAVAIL;
1026 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1027 flags & MSG_DONTWAIT, &rc);
1032 cb = (struct qrtr_cb *)skb->cb;
1035 if (copied > size) {
1037 msg->msg_flags |= MSG_TRUNC;
1040 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1046 /* There is an anonymous 2-byte hole after sq_family,
1047 * make sure to clear it.
1049 memset(addr, 0, sizeof(*addr));
1051 addr->sq_family = AF_QIPCRTR;
1052 addr->sq_node = cb->src_node;
1053 addr->sq_port = cb->src_port;
1054 msg->msg_namelen = sizeof(*addr);
1059 qrtr_send_resume_tx(cb);
1061 skb_free_datagram(sk, skb);
1067 static int qrtr_connect(struct socket *sock, struct sockaddr *saddr,
1070 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr);
1071 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
1072 struct sock *sk = sock->sk;
1075 if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR)
1080 sk->sk_state = TCP_CLOSE;
1081 sock->state = SS_UNCONNECTED;
1083 rc = qrtr_autobind(sock);
1090 sock->state = SS_CONNECTED;
1091 sk->sk_state = TCP_ESTABLISHED;
1098 static int qrtr_getname(struct socket *sock, struct sockaddr *saddr,
1101 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
1102 struct sockaddr_qrtr qaddr;
1103 struct sock *sk = sock->sk;
1107 if (sk->sk_state != TCP_ESTABLISHED) {
1118 qaddr.sq_family = AF_QIPCRTR;
1120 memcpy(saddr, &qaddr, sizeof(qaddr));
1122 return sizeof(qaddr);
1125 static int qrtr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1127 void __user *argp = (void __user *)arg;
1128 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
1129 struct sock *sk = sock->sk;
1130 struct sockaddr_qrtr *sq;
1131 struct sk_buff *skb;
1140 len = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1143 rc = put_user(len, (int __user *)argp);
1146 skb = skb_peek(&sk->sk_receive_queue);
1149 rc = put_user(len, (int __user *)argp);
1152 if (copy_from_user(&ifr, argp, sizeof(ifr))) {
1157 sq = (struct sockaddr_qrtr *)&ifr.ifr_addr;
1159 if (copy_to_user(argp, &ifr, sizeof(ifr))) {
1167 case SIOCGIFDSTADDR:
1168 case SIOCSIFDSTADDR:
1169 case SIOCGIFBRDADDR:
1170 case SIOCSIFBRDADDR:
1171 case SIOCGIFNETMASK:
1172 case SIOCSIFNETMASK:
1185 static int qrtr_release(struct socket *sock)
1187 struct sock *sk = sock->sk;
1188 struct qrtr_sock *ipc;
1196 sk->sk_shutdown = SHUTDOWN_MASK;
1197 if (!sock_flag(sk, SOCK_DEAD))
1198 sk->sk_state_change(sk);
1200 sock_set_flag(sk, SOCK_DEAD);
1204 if (!sock_flag(sk, SOCK_ZAPPED))
1205 qrtr_port_remove(ipc);
1207 skb_queue_purge(&sk->sk_receive_queue);
1215 static const struct proto_ops qrtr_proto_ops = {
1216 .owner = THIS_MODULE,
1217 .family = AF_QIPCRTR,
1219 .connect = qrtr_connect,
1220 .socketpair = sock_no_socketpair,
1221 .accept = sock_no_accept,
1222 .listen = sock_no_listen,
1223 .sendmsg = qrtr_sendmsg,
1224 .recvmsg = qrtr_recvmsg,
1225 .getname = qrtr_getname,
1226 .ioctl = qrtr_ioctl,
1227 .gettstamp = sock_gettstamp,
1228 .poll = datagram_poll,
1229 .shutdown = sock_no_shutdown,
1230 .release = qrtr_release,
1231 .mmap = sock_no_mmap,
1232 .sendpage = sock_no_sendpage,
1235 static struct proto qrtr_proto = {
1237 .owner = THIS_MODULE,
1238 .obj_size = sizeof(struct qrtr_sock),
1241 static int qrtr_create(struct net *net, struct socket *sock,
1242 int protocol, int kern)
1244 struct qrtr_sock *ipc;
1247 if (sock->type != SOCK_DGRAM)
1250 sk = sk_alloc(net, AF_QIPCRTR, GFP_KERNEL, &qrtr_proto, kern);
1254 sock_set_flag(sk, SOCK_ZAPPED);
1256 sock_init_data(sock, sk);
1257 sock->ops = &qrtr_proto_ops;
1260 ipc->us.sq_family = AF_QIPCRTR;
1261 ipc->us.sq_node = qrtr_local_nid;
1262 ipc->us.sq_port = 0;
1267 static const struct net_proto_family qrtr_family = {
1268 .owner = THIS_MODULE,
1269 .family = AF_QIPCRTR,
1270 .create = qrtr_create,
1273 static int __init qrtr_proto_init(void)
1277 rc = proto_register(&qrtr_proto, 1);
1281 rc = sock_register(&qrtr_family);
1283 proto_unregister(&qrtr_proto);
1291 postcore_initcall(qrtr_proto_init);
1293 static void __exit qrtr_proto_fini(void)
1296 sock_unregister(qrtr_family.family);
1297 proto_unregister(&qrtr_proto);
1299 module_exit(qrtr_proto_fini);
1301 MODULE_DESCRIPTION("Qualcomm IPC-router driver");
1302 MODULE_LICENSE("GPL v2");
1303 MODULE_ALIAS_NETPROTO(PF_QIPCRTR);