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 the node is a bridge for other nodes, there are possibly
175 * multiple entries pointing to our released node, delete them all.
177 radix_tree_for_each_slot(slot, &qrtr_nodes, &iter, 0) {
179 radix_tree_iter_delete(&qrtr_nodes, &iter, slot);
181 spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
183 list_del(&node->item);
184 mutex_unlock(&qrtr_node_lock);
186 skb_queue_purge(&node->rx_queue);
188 /* Free tx flow counters */
189 radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) {
191 radix_tree_iter_delete(&node->qrtr_tx_flow, &iter, slot);
197 /* Increment reference to node. */
198 static struct qrtr_node *qrtr_node_acquire(struct qrtr_node *node)
201 kref_get(&node->ref);
205 /* Decrement reference to node and release as necessary. */
206 static void qrtr_node_release(struct qrtr_node *node)
210 kref_put_mutex(&node->ref, __qrtr_node_release, &qrtr_node_lock);
214 * qrtr_tx_resume() - reset flow control counter
215 * @node: qrtr_node that the QRTR_TYPE_RESUME_TX packet arrived on
216 * @skb: resume_tx packet
218 static void qrtr_tx_resume(struct qrtr_node *node, struct sk_buff *skb)
220 struct qrtr_ctrl_pkt *pkt = (struct qrtr_ctrl_pkt *)skb->data;
221 u64 remote_node = le32_to_cpu(pkt->client.node);
222 u32 remote_port = le32_to_cpu(pkt->client.port);
223 struct qrtr_tx_flow *flow;
226 key = remote_node << 32 | remote_port;
229 flow = radix_tree_lookup(&node->qrtr_tx_flow, key);
232 spin_lock(&flow->resume_tx.lock);
234 spin_unlock(&flow->resume_tx.lock);
235 wake_up_interruptible_all(&flow->resume_tx);
242 * qrtr_tx_wait() - flow control for outgoing packets
243 * @node: qrtr_node that the packet is to be send to
244 * @dest_node: node id of the destination
245 * @dest_port: port number of the destination
246 * @type: type of message
248 * The flow control scheme is based around the low and high "watermarks". When
249 * the low watermark is passed the confirm_rx flag is set on the outgoing
250 * message, which will trigger the remote to send a control message of the type
251 * QRTR_TYPE_RESUME_TX to reset the counter. If the high watermark is hit
252 * further transmision should be paused.
254 * Return: 1 if confirm_rx should be set, 0 otherwise or errno failure
256 static int qrtr_tx_wait(struct qrtr_node *node, int dest_node, int dest_port,
259 unsigned long key = (u64)dest_node << 32 | dest_port;
260 struct qrtr_tx_flow *flow;
264 /* Never set confirm_rx on non-data packets */
265 if (type != QRTR_TYPE_DATA)
268 mutex_lock(&node->qrtr_tx_lock);
269 flow = radix_tree_lookup(&node->qrtr_tx_flow, key);
271 flow = kzalloc(sizeof(*flow), GFP_KERNEL);
273 init_waitqueue_head(&flow->resume_tx);
274 if (radix_tree_insert(&node->qrtr_tx_flow, key, flow)) {
280 mutex_unlock(&node->qrtr_tx_lock);
282 /* Set confirm_rx if we where unable to find and allocate a flow */
286 spin_lock_irq(&flow->resume_tx.lock);
287 ret = wait_event_interruptible_locked_irq(flow->resume_tx,
288 flow->pending < QRTR_TX_FLOW_HIGH ||
293 } else if (!node->ep) {
295 } else if (flow->tx_failed) {
300 confirm_rx = flow->pending == QRTR_TX_FLOW_LOW;
302 spin_unlock_irq(&flow->resume_tx.lock);
308 * qrtr_tx_flow_failed() - flag that tx of confirm_rx flagged messages failed
309 * @node: qrtr_node that the packet is to be send to
310 * @dest_node: node id of the destination
311 * @dest_port: port number of the destination
313 * Signal that the transmission of a message with confirm_rx flag failed. The
314 * flow's "pending" counter will keep incrementing towards QRTR_TX_FLOW_HIGH,
315 * at which point transmission would stall forever waiting for the resume TX
316 * message associated with the dropped confirm_rx message.
317 * Work around this by marking the flow as having a failed transmission and
318 * cause the next transmission attempt to be sent with the confirm_rx.
320 static void qrtr_tx_flow_failed(struct qrtr_node *node, int dest_node,
323 unsigned long key = (u64)dest_node << 32 | dest_port;
324 struct qrtr_tx_flow *flow;
327 flow = radix_tree_lookup(&node->qrtr_tx_flow, key);
330 spin_lock_irq(&flow->resume_tx.lock);
332 spin_unlock_irq(&flow->resume_tx.lock);
336 /* Pass an outgoing packet socket buffer to the endpoint driver. */
337 static int qrtr_node_enqueue(struct qrtr_node *node, struct sk_buff *skb,
338 int type, struct sockaddr_qrtr *from,
339 struct sockaddr_qrtr *to)
341 struct qrtr_hdr_v1 *hdr;
342 size_t len = skb->len;
345 confirm_rx = qrtr_tx_wait(node, to->sq_node, to->sq_port, type);
346 if (confirm_rx < 0) {
351 hdr = skb_push(skb, sizeof(*hdr));
352 hdr->version = cpu_to_le32(QRTR_PROTO_VER_1);
353 hdr->type = cpu_to_le32(type);
354 hdr->src_node_id = cpu_to_le32(from->sq_node);
355 hdr->src_port_id = cpu_to_le32(from->sq_port);
356 if (to->sq_port == QRTR_PORT_CTRL) {
357 hdr->dst_node_id = cpu_to_le32(node->nid);
358 hdr->dst_port_id = cpu_to_le32(QRTR_PORT_CTRL);
360 hdr->dst_node_id = cpu_to_le32(to->sq_node);
361 hdr->dst_port_id = cpu_to_le32(to->sq_port);
364 hdr->size = cpu_to_le32(len);
365 hdr->confirm_rx = !!confirm_rx;
367 rc = skb_put_padto(skb, ALIGN(len, 4) + sizeof(*hdr));
370 mutex_lock(&node->ep_lock);
373 rc = node->ep->xmit(node->ep, skb);
376 mutex_unlock(&node->ep_lock);
378 /* Need to ensure that a subsequent message carries the otherwise lost
379 * confirm_rx flag if we dropped this one */
380 if (rc && confirm_rx)
381 qrtr_tx_flow_failed(node, to->sq_node, to->sq_port);
386 /* Lookup node by id.
388 * callers must release with qrtr_node_release()
390 static struct qrtr_node *qrtr_node_lookup(unsigned int nid)
392 struct qrtr_node *node;
395 spin_lock_irqsave(&qrtr_nodes_lock, flags);
396 node = radix_tree_lookup(&qrtr_nodes, nid);
397 node = qrtr_node_acquire(node);
398 spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
403 /* Assign node id to node.
405 * This is mostly useful for automatic node id assignment, based on
406 * the source id in the incoming packet.
408 static void qrtr_node_assign(struct qrtr_node *node, unsigned int nid)
412 if (nid == QRTR_EP_NID_AUTO)
415 spin_lock_irqsave(&qrtr_nodes_lock, flags);
416 radix_tree_insert(&qrtr_nodes, nid, node);
417 if (node->nid == QRTR_EP_NID_AUTO)
419 spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
423 * qrtr_endpoint_post() - post incoming data
424 * @ep: endpoint handle
425 * @data: data pointer
426 * @len: size of data in bytes
428 * Return: 0 on success; negative error code on failure
430 int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len)
432 struct qrtr_node *node = ep->node;
433 const struct qrtr_hdr_v1 *v1;
434 const struct qrtr_hdr_v2 *v2;
435 struct qrtr_sock *ipc;
442 if (len == 0 || len & 3)
445 skb = __netdev_alloc_skb(NULL, len, GFP_ATOMIC | __GFP_NOWARN);
449 cb = (struct qrtr_cb *)skb->cb;
451 /* Version field in v1 is little endian, so this works for both cases */
455 case QRTR_PROTO_VER_1:
456 if (len < sizeof(*v1))
459 hdrlen = sizeof(*v1);
461 cb->type = le32_to_cpu(v1->type);
462 cb->src_node = le32_to_cpu(v1->src_node_id);
463 cb->src_port = le32_to_cpu(v1->src_port_id);
464 cb->confirm_rx = !!v1->confirm_rx;
465 cb->dst_node = le32_to_cpu(v1->dst_node_id);
466 cb->dst_port = le32_to_cpu(v1->dst_port_id);
468 size = le32_to_cpu(v1->size);
470 case QRTR_PROTO_VER_2:
471 if (len < sizeof(*v2))
474 hdrlen = sizeof(*v2) + v2->optlen;
477 cb->confirm_rx = !!(v2->flags & QRTR_FLAGS_CONFIRM_RX);
478 cb->src_node = le16_to_cpu(v2->src_node_id);
479 cb->src_port = le16_to_cpu(v2->src_port_id);
480 cb->dst_node = le16_to_cpu(v2->dst_node_id);
481 cb->dst_port = le16_to_cpu(v2->dst_port_id);
483 if (cb->src_port == (u16)QRTR_PORT_CTRL)
484 cb->src_port = QRTR_PORT_CTRL;
485 if (cb->dst_port == (u16)QRTR_PORT_CTRL)
486 cb->dst_port = QRTR_PORT_CTRL;
488 size = le32_to_cpu(v2->size);
491 pr_err("qrtr: Invalid version %d\n", ver);
495 if (len != ALIGN(size, 4) + hdrlen)
498 if (cb->dst_port != QRTR_PORT_CTRL && cb->type != QRTR_TYPE_DATA &&
499 cb->type != QRTR_TYPE_RESUME_TX)
502 skb_put_data(skb, data + hdrlen, size);
504 qrtr_node_assign(node, cb->src_node);
506 if (cb->type == QRTR_TYPE_NEW_SERVER) {
507 /* Remote node endpoint can bridge other distant nodes */
508 const struct qrtr_ctrl_pkt *pkt = data + hdrlen;
510 qrtr_node_assign(node, le32_to_cpu(pkt->server.node));
513 if (cb->type == QRTR_TYPE_RESUME_TX) {
514 qrtr_tx_resume(node, skb);
516 ipc = qrtr_port_lookup(cb->dst_port);
520 if (sock_queue_rcv_skb(&ipc->sk, skb))
533 EXPORT_SYMBOL_GPL(qrtr_endpoint_post);
536 * qrtr_alloc_ctrl_packet() - allocate control packet skb
537 * @pkt: reference to qrtr_ctrl_pkt pointer
538 * @flags: the type of memory to allocate
540 * Returns newly allocated sk_buff, or NULL on failure
542 * This function allocates a sk_buff large enough to carry a qrtr_ctrl_pkt and
543 * on success returns a reference to the control packet in @pkt.
545 static struct sk_buff *qrtr_alloc_ctrl_packet(struct qrtr_ctrl_pkt **pkt,
548 const int pkt_len = sizeof(struct qrtr_ctrl_pkt);
551 skb = alloc_skb(QRTR_HDR_MAX_SIZE + pkt_len, flags);
555 skb_reserve(skb, QRTR_HDR_MAX_SIZE);
556 *pkt = skb_put_zero(skb, pkt_len);
562 * qrtr_endpoint_register() - register a new endpoint
563 * @ep: endpoint to register
564 * @nid: desired node id; may be QRTR_EP_NID_AUTO for auto-assignment
565 * Return: 0 on success; negative error code on failure
567 * The specified endpoint must have the xmit function pointer set on call.
569 int qrtr_endpoint_register(struct qrtr_endpoint *ep, unsigned int nid)
571 struct qrtr_node *node;
573 if (!ep || !ep->xmit)
576 node = kzalloc(sizeof(*node), GFP_KERNEL);
580 kref_init(&node->ref);
581 mutex_init(&node->ep_lock);
582 skb_queue_head_init(&node->rx_queue);
583 node->nid = QRTR_EP_NID_AUTO;
586 INIT_RADIX_TREE(&node->qrtr_tx_flow, GFP_KERNEL);
587 mutex_init(&node->qrtr_tx_lock);
589 qrtr_node_assign(node, nid);
591 mutex_lock(&qrtr_node_lock);
592 list_add(&node->item, &qrtr_all_nodes);
593 mutex_unlock(&qrtr_node_lock);
598 EXPORT_SYMBOL_GPL(qrtr_endpoint_register);
601 * qrtr_endpoint_unregister - unregister endpoint
602 * @ep: endpoint to unregister
604 void qrtr_endpoint_unregister(struct qrtr_endpoint *ep)
606 struct qrtr_node *node = ep->node;
607 struct sockaddr_qrtr src = {AF_QIPCRTR, node->nid, QRTR_PORT_CTRL};
608 struct sockaddr_qrtr dst = {AF_QIPCRTR, qrtr_local_nid, QRTR_PORT_CTRL};
609 struct radix_tree_iter iter;
610 struct qrtr_ctrl_pkt *pkt;
611 struct qrtr_tx_flow *flow;
616 mutex_lock(&node->ep_lock);
618 mutex_unlock(&node->ep_lock);
620 /* Notify the local controller about the event */
621 spin_lock_irqsave(&qrtr_nodes_lock, flags);
622 radix_tree_for_each_slot(slot, &qrtr_nodes, &iter, 0) {
625 src.sq_node = iter.index;
626 skb = qrtr_alloc_ctrl_packet(&pkt, GFP_ATOMIC);
628 pkt->cmd = cpu_to_le32(QRTR_TYPE_BYE);
629 qrtr_local_enqueue(NULL, skb, QRTR_TYPE_BYE, &src, &dst);
632 spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
634 /* Wake up any transmitters waiting for resume-tx from the node */
635 mutex_lock(&node->qrtr_tx_lock);
636 radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) {
638 wake_up_interruptible_all(&flow->resume_tx);
640 mutex_unlock(&node->qrtr_tx_lock);
642 qrtr_node_release(node);
645 EXPORT_SYMBOL_GPL(qrtr_endpoint_unregister);
647 /* Lookup socket by port.
649 * Callers must release with qrtr_port_put()
651 static struct qrtr_sock *qrtr_port_lookup(int port)
653 struct qrtr_sock *ipc;
655 if (port == QRTR_PORT_CTRL)
659 ipc = idr_find(&qrtr_ports, port);
667 /* Release acquired socket. */
668 static void qrtr_port_put(struct qrtr_sock *ipc)
673 /* Remove port assignment. */
674 static void qrtr_port_remove(struct qrtr_sock *ipc)
676 struct qrtr_ctrl_pkt *pkt;
678 int port = ipc->us.sq_port;
679 struct sockaddr_qrtr to;
681 to.sq_family = AF_QIPCRTR;
682 to.sq_node = QRTR_NODE_BCAST;
683 to.sq_port = QRTR_PORT_CTRL;
685 skb = qrtr_alloc_ctrl_packet(&pkt, GFP_KERNEL);
687 pkt->cmd = cpu_to_le32(QRTR_TYPE_DEL_CLIENT);
688 pkt->client.node = cpu_to_le32(ipc->us.sq_node);
689 pkt->client.port = cpu_to_le32(ipc->us.sq_port);
691 skb_set_owner_w(skb, &ipc->sk);
692 qrtr_bcast_enqueue(NULL, skb, QRTR_TYPE_DEL_CLIENT, &ipc->us,
696 if (port == QRTR_PORT_CTRL)
699 __sock_put(&ipc->sk);
701 mutex_lock(&qrtr_port_lock);
702 idr_remove(&qrtr_ports, port);
703 mutex_unlock(&qrtr_port_lock);
705 /* Ensure that if qrtr_port_lookup() did enter the RCU read section we
706 * wait for it to up increment the refcount */
710 /* Assign port number to socket.
712 * Specify port in the integer pointed to by port, and it will be adjusted
713 * on return as necesssary.
716 * 0: Assign ephemeral port in [QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET]
717 * <QRTR_MIN_EPH_SOCKET: Specified; requires CAP_NET_ADMIN
718 * >QRTR_MIN_EPH_SOCKET: Specified; available to all
720 static int qrtr_port_assign(struct qrtr_sock *ipc, int *port)
725 mutex_lock(&qrtr_port_lock);
727 min_port = QRTR_MIN_EPH_SOCKET;
728 rc = idr_alloc_u32(&qrtr_ports, ipc, &min_port, QRTR_MAX_EPH_SOCKET, GFP_ATOMIC);
731 } else if (*port < QRTR_MIN_EPH_SOCKET && !capable(CAP_NET_ADMIN)) {
733 } else if (*port == QRTR_PORT_CTRL) {
735 rc = idr_alloc_u32(&qrtr_ports, ipc, &min_port, 0, GFP_ATOMIC);
738 rc = idr_alloc_u32(&qrtr_ports, ipc, &min_port, *port, GFP_ATOMIC);
742 mutex_unlock(&qrtr_port_lock);
754 /* Reset all non-control ports */
755 static void qrtr_reset_ports(void)
757 struct qrtr_sock *ipc;
760 mutex_lock(&qrtr_port_lock);
761 idr_for_each_entry(&qrtr_ports, ipc, id) {
762 /* Don't reset control port */
767 ipc->sk.sk_err = ENETRESET;
768 ipc->sk.sk_error_report(&ipc->sk);
771 mutex_unlock(&qrtr_port_lock);
774 /* Bind socket to address.
776 * Socket should be locked upon call.
778 static int __qrtr_bind(struct socket *sock,
779 const struct sockaddr_qrtr *addr, int zapped)
781 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
782 struct sock *sk = sock->sk;
787 if (!zapped && addr->sq_port == ipc->us.sq_port)
790 port = addr->sq_port;
791 rc = qrtr_port_assign(ipc, &port);
795 /* unbind previous, if any */
797 qrtr_port_remove(ipc);
798 ipc->us.sq_port = port;
800 sock_reset_flag(sk, SOCK_ZAPPED);
802 /* Notify all open ports about the new controller */
803 if (port == QRTR_PORT_CTRL)
809 /* Auto bind to an ephemeral port. */
810 static int qrtr_autobind(struct socket *sock)
812 struct sock *sk = sock->sk;
813 struct sockaddr_qrtr addr;
815 if (!sock_flag(sk, SOCK_ZAPPED))
818 addr.sq_family = AF_QIPCRTR;
819 addr.sq_node = qrtr_local_nid;
822 return __qrtr_bind(sock, &addr, 1);
825 /* Bind socket to specified sockaddr. */
826 static int qrtr_bind(struct socket *sock, struct sockaddr *saddr, int len)
828 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr);
829 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
830 struct sock *sk = sock->sk;
833 if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR)
836 if (addr->sq_node != ipc->us.sq_node)
840 rc = __qrtr_bind(sock, addr, sock_flag(sk, SOCK_ZAPPED));
846 /* Queue packet to local peer socket. */
847 static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb,
848 int type, struct sockaddr_qrtr *from,
849 struct sockaddr_qrtr *to)
851 struct qrtr_sock *ipc;
854 ipc = qrtr_port_lookup(to->sq_port);
855 if (!ipc || &ipc->sk == skb->sk) { /* do not send to self */
860 cb = (struct qrtr_cb *)skb->cb;
861 cb->src_node = from->sq_node;
862 cb->src_port = from->sq_port;
864 if (sock_queue_rcv_skb(&ipc->sk, skb)) {
875 /* Queue packet for broadcast. */
876 static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb,
877 int type, struct sockaddr_qrtr *from,
878 struct sockaddr_qrtr *to)
880 struct sk_buff *skbn;
882 mutex_lock(&qrtr_node_lock);
883 list_for_each_entry(node, &qrtr_all_nodes, item) {
884 skbn = skb_clone(skb, GFP_KERNEL);
887 skb_set_owner_w(skbn, skb->sk);
888 qrtr_node_enqueue(node, skbn, type, from, to);
890 mutex_unlock(&qrtr_node_lock);
892 qrtr_local_enqueue(NULL, skb, type, from, to);
897 static int qrtr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
899 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name);
900 int (*enqueue_fn)(struct qrtr_node *, struct sk_buff *, int,
901 struct sockaddr_qrtr *, struct sockaddr_qrtr *);
902 __le32 qrtr_type = cpu_to_le32(QRTR_TYPE_DATA);
903 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
904 struct sock *sk = sock->sk;
905 struct qrtr_node *node;
911 if (msg->msg_flags & ~(MSG_DONTWAIT))
920 if (msg->msg_namelen < sizeof(*addr)) {
925 if (addr->sq_family != AF_QIPCRTR) {
930 rc = qrtr_autobind(sock);
935 } else if (sk->sk_state == TCP_ESTABLISHED) {
943 if (addr->sq_node == QRTR_NODE_BCAST) {
944 if (addr->sq_port != QRTR_PORT_CTRL &&
945 qrtr_local_nid != QRTR_NODE_BCAST) {
949 enqueue_fn = qrtr_bcast_enqueue;
950 } else if (addr->sq_node == ipc->us.sq_node) {
951 enqueue_fn = qrtr_local_enqueue;
953 node = qrtr_node_lookup(addr->sq_node);
958 enqueue_fn = qrtr_node_enqueue;
961 plen = (len + 3) & ~3;
962 skb = sock_alloc_send_skb(sk, plen + QRTR_HDR_MAX_SIZE,
963 msg->msg_flags & MSG_DONTWAIT, &rc);
969 skb_reserve(skb, QRTR_HDR_MAX_SIZE);
971 rc = memcpy_from_msg(skb_put(skb, len), msg, len);
977 if (ipc->us.sq_port == QRTR_PORT_CTRL) {
984 /* control messages already require the type as 'command' */
985 skb_copy_bits(skb, 0, &qrtr_type, 4);
988 type = le32_to_cpu(qrtr_type);
989 rc = enqueue_fn(node, skb, type, &ipc->us, addr);
994 qrtr_node_release(node);
1000 static int qrtr_send_resume_tx(struct qrtr_cb *cb)
1002 struct sockaddr_qrtr remote = { AF_QIPCRTR, cb->src_node, cb->src_port };
1003 struct sockaddr_qrtr local = { AF_QIPCRTR, cb->dst_node, cb->dst_port };
1004 struct qrtr_ctrl_pkt *pkt;
1005 struct qrtr_node *node;
1006 struct sk_buff *skb;
1009 node = qrtr_node_lookup(remote.sq_node);
1013 skb = qrtr_alloc_ctrl_packet(&pkt, GFP_KERNEL);
1017 pkt->cmd = cpu_to_le32(QRTR_TYPE_RESUME_TX);
1018 pkt->client.node = cpu_to_le32(cb->dst_node);
1019 pkt->client.port = cpu_to_le32(cb->dst_port);
1021 ret = qrtr_node_enqueue(node, skb, QRTR_TYPE_RESUME_TX, &local, &remote);
1023 qrtr_node_release(node);
1028 static int qrtr_recvmsg(struct socket *sock, struct msghdr *msg,
1029 size_t size, int flags)
1031 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name);
1032 struct sock *sk = sock->sk;
1033 struct sk_buff *skb;
1039 if (sock_flag(sk, SOCK_ZAPPED)) {
1041 return -EADDRNOTAVAIL;
1044 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
1045 flags & MSG_DONTWAIT, &rc);
1050 cb = (struct qrtr_cb *)skb->cb;
1053 if (copied > size) {
1055 msg->msg_flags |= MSG_TRUNC;
1058 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1064 /* There is an anonymous 2-byte hole after sq_family,
1065 * make sure to clear it.
1067 memset(addr, 0, sizeof(*addr));
1069 addr->sq_family = AF_QIPCRTR;
1070 addr->sq_node = cb->src_node;
1071 addr->sq_port = cb->src_port;
1072 msg->msg_namelen = sizeof(*addr);
1077 qrtr_send_resume_tx(cb);
1079 skb_free_datagram(sk, skb);
1085 static int qrtr_connect(struct socket *sock, struct sockaddr *saddr,
1088 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr);
1089 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
1090 struct sock *sk = sock->sk;
1093 if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR)
1098 sk->sk_state = TCP_CLOSE;
1099 sock->state = SS_UNCONNECTED;
1101 rc = qrtr_autobind(sock);
1108 sock->state = SS_CONNECTED;
1109 sk->sk_state = TCP_ESTABLISHED;
1116 static int qrtr_getname(struct socket *sock, struct sockaddr *saddr,
1119 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
1120 struct sockaddr_qrtr qaddr;
1121 struct sock *sk = sock->sk;
1125 if (sk->sk_state != TCP_ESTABLISHED) {
1136 qaddr.sq_family = AF_QIPCRTR;
1138 memcpy(saddr, &qaddr, sizeof(qaddr));
1140 return sizeof(qaddr);
1143 static int qrtr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1145 void __user *argp = (void __user *)arg;
1146 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
1147 struct sock *sk = sock->sk;
1148 struct sockaddr_qrtr *sq;
1149 struct sk_buff *skb;
1158 len = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1161 rc = put_user(len, (int __user *)argp);
1164 skb = skb_peek(&sk->sk_receive_queue);
1167 rc = put_user(len, (int __user *)argp);
1170 if (copy_from_user(&ifr, argp, sizeof(ifr))) {
1175 sq = (struct sockaddr_qrtr *)&ifr.ifr_addr;
1177 if (copy_to_user(argp, &ifr, sizeof(ifr))) {
1185 case SIOCGIFDSTADDR:
1186 case SIOCSIFDSTADDR:
1187 case SIOCGIFBRDADDR:
1188 case SIOCSIFBRDADDR:
1189 case SIOCGIFNETMASK:
1190 case SIOCSIFNETMASK:
1203 static int qrtr_release(struct socket *sock)
1205 struct sock *sk = sock->sk;
1206 struct qrtr_sock *ipc;
1214 sk->sk_shutdown = SHUTDOWN_MASK;
1215 if (!sock_flag(sk, SOCK_DEAD))
1216 sk->sk_state_change(sk);
1218 sock_set_flag(sk, SOCK_DEAD);
1222 if (!sock_flag(sk, SOCK_ZAPPED))
1223 qrtr_port_remove(ipc);
1225 skb_queue_purge(&sk->sk_receive_queue);
1233 static const struct proto_ops qrtr_proto_ops = {
1234 .owner = THIS_MODULE,
1235 .family = AF_QIPCRTR,
1237 .connect = qrtr_connect,
1238 .socketpair = sock_no_socketpair,
1239 .accept = sock_no_accept,
1240 .listen = sock_no_listen,
1241 .sendmsg = qrtr_sendmsg,
1242 .recvmsg = qrtr_recvmsg,
1243 .getname = qrtr_getname,
1244 .ioctl = qrtr_ioctl,
1245 .gettstamp = sock_gettstamp,
1246 .poll = datagram_poll,
1247 .shutdown = sock_no_shutdown,
1248 .release = qrtr_release,
1249 .mmap = sock_no_mmap,
1250 .sendpage = sock_no_sendpage,
1253 static struct proto qrtr_proto = {
1255 .owner = THIS_MODULE,
1256 .obj_size = sizeof(struct qrtr_sock),
1259 static int qrtr_create(struct net *net, struct socket *sock,
1260 int protocol, int kern)
1262 struct qrtr_sock *ipc;
1265 if (sock->type != SOCK_DGRAM)
1268 sk = sk_alloc(net, AF_QIPCRTR, GFP_KERNEL, &qrtr_proto, kern);
1272 sock_set_flag(sk, SOCK_ZAPPED);
1274 sock_init_data(sock, sk);
1275 sock->ops = &qrtr_proto_ops;
1278 ipc->us.sq_family = AF_QIPCRTR;
1279 ipc->us.sq_node = qrtr_local_nid;
1280 ipc->us.sq_port = 0;
1285 static const struct net_proto_family qrtr_family = {
1286 .owner = THIS_MODULE,
1287 .family = AF_QIPCRTR,
1288 .create = qrtr_create,
1291 static int __init qrtr_proto_init(void)
1295 rc = proto_register(&qrtr_proto, 1);
1299 rc = sock_register(&qrtr_family);
1303 rc = qrtr_ns_init();
1310 sock_unregister(qrtr_family.family);
1312 proto_unregister(&qrtr_proto);
1315 postcore_initcall(qrtr_proto_init);
1317 static void __exit qrtr_proto_fini(void)
1320 sock_unregister(qrtr_family.family);
1321 proto_unregister(&qrtr_proto);
1323 module_exit(qrtr_proto_fini);
1325 MODULE_DESCRIPTION("Qualcomm IPC-router driver");
1326 MODULE_LICENSE("GPL v2");
1327 MODULE_ALIAS_NETPROTO(PF_QIPCRTR);