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)
26 #define QRTR_PORT_CTRL_LEGACY 0xffff
29 * struct qrtr_hdr_v1 - (I|R)PCrouter packet header version 1
30 * @version: protocol version
31 * @type: packet type; one of QRTR_TYPE_*
32 * @src_node_id: source node
33 * @src_port_id: source port
34 * @confirm_rx: boolean; whether a resume-tx packet should be send in reply
35 * @size: length of packet, excluding this header
36 * @dst_node_id: destination node
37 * @dst_port_id: destination port
51 * struct qrtr_hdr_v2 - (I|R)PCrouter packet header later versions
52 * @version: protocol version
53 * @type: packet type; one of QRTR_TYPE_*
54 * @flags: bitmask of QRTR_FLAGS_*
55 * @optlen: length of optional header data
56 * @size: length of packet, excluding this header and optlen
57 * @src_node_id: source node
58 * @src_port_id: source port
59 * @dst_node_id: destination node
60 * @dst_port_id: destination port
74 #define QRTR_FLAGS_CONFIRM_RX BIT(0)
86 #define QRTR_HDR_MAX_SIZE max_t(size_t, sizeof(struct qrtr_hdr_v1), \
87 sizeof(struct qrtr_hdr_v2))
90 /* WARNING: sk must be the first member */
92 struct sockaddr_qrtr us;
93 struct sockaddr_qrtr peer;
96 static inline struct qrtr_sock *qrtr_sk(struct sock *sk)
98 BUILD_BUG_ON(offsetof(struct qrtr_sock, sk) != 0);
99 return container_of(sk, struct qrtr_sock, sk);
102 static unsigned int qrtr_local_nid = 1;
105 static RADIX_TREE(qrtr_nodes, GFP_ATOMIC);
106 static DEFINE_SPINLOCK(qrtr_nodes_lock);
108 static LIST_HEAD(qrtr_all_nodes);
109 /* lock for qrtr_all_nodes and node reference */
110 static DEFINE_MUTEX(qrtr_node_lock);
112 /* local port allocation management */
113 static DEFINE_XARRAY_ALLOC(qrtr_ports);
116 * struct qrtr_node - endpoint node
117 * @ep_lock: lock for endpoint management and callbacks
119 * @ref: reference count for node
121 * @qrtr_tx_flow: tree of qrtr_tx_flow, keyed by node << 32 | port
122 * @qrtr_tx_lock: lock for qrtr_tx_flow inserts
123 * @rx_queue: receive queue
124 * @item: list item for broadcast list
127 struct mutex ep_lock;
128 struct qrtr_endpoint *ep;
132 struct radix_tree_root qrtr_tx_flow;
133 struct mutex qrtr_tx_lock; /* for qrtr_tx_flow */
135 struct sk_buff_head rx_queue;
136 struct list_head item;
140 * struct qrtr_tx_flow - tx flow control
141 * @resume_tx: waiters for a resume tx from the remote
142 * @pending: number of waiting senders
143 * @tx_failed: indicates that a message with confirm_rx flag was lost
145 struct qrtr_tx_flow {
146 struct wait_queue_head resume_tx;
151 #define QRTR_TX_FLOW_HIGH 10
152 #define QRTR_TX_FLOW_LOW 5
154 static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb,
155 int type, struct sockaddr_qrtr *from,
156 struct sockaddr_qrtr *to);
157 static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb,
158 int type, struct sockaddr_qrtr *from,
159 struct sockaddr_qrtr *to);
160 static struct qrtr_sock *qrtr_port_lookup(int port);
161 static void qrtr_port_put(struct qrtr_sock *ipc);
163 /* Release node resources and free the node.
165 * Do not call directly, use qrtr_node_release. To be used with
166 * kref_put_mutex. As such, the node mutex is expected to be locked on call.
168 static void __qrtr_node_release(struct kref *kref)
170 struct qrtr_node *node = container_of(kref, struct qrtr_node, ref);
171 struct radix_tree_iter iter;
172 struct qrtr_tx_flow *flow;
176 spin_lock_irqsave(&qrtr_nodes_lock, flags);
177 /* If the node is a bridge for other nodes, there are possibly
178 * multiple entries pointing to our released node, delete them all.
180 radix_tree_for_each_slot(slot, &qrtr_nodes, &iter, 0) {
182 radix_tree_iter_delete(&qrtr_nodes, &iter, slot);
184 spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
186 list_del(&node->item);
187 mutex_unlock(&qrtr_node_lock);
189 skb_queue_purge(&node->rx_queue);
191 /* Free tx flow counters */
192 radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) {
194 radix_tree_iter_delete(&node->qrtr_tx_flow, &iter, slot);
200 /* Increment reference to node. */
201 static struct qrtr_node *qrtr_node_acquire(struct qrtr_node *node)
204 kref_get(&node->ref);
208 /* Decrement reference to node and release as necessary. */
209 static void qrtr_node_release(struct qrtr_node *node)
213 kref_put_mutex(&node->ref, __qrtr_node_release, &qrtr_node_lock);
217 * qrtr_tx_resume() - reset flow control counter
218 * @node: qrtr_node that the QRTR_TYPE_RESUME_TX packet arrived on
219 * @skb: resume_tx packet
221 static void qrtr_tx_resume(struct qrtr_node *node, struct sk_buff *skb)
223 struct qrtr_ctrl_pkt *pkt = (struct qrtr_ctrl_pkt *)skb->data;
224 u64 remote_node = le32_to_cpu(pkt->client.node);
225 u32 remote_port = le32_to_cpu(pkt->client.port);
226 struct qrtr_tx_flow *flow;
229 key = remote_node << 32 | remote_port;
232 flow = radix_tree_lookup(&node->qrtr_tx_flow, key);
235 spin_lock(&flow->resume_tx.lock);
237 spin_unlock(&flow->resume_tx.lock);
238 wake_up_interruptible_all(&flow->resume_tx);
245 * qrtr_tx_wait() - flow control for outgoing packets
246 * @node: qrtr_node that the packet is to be send to
247 * @dest_node: node id of the destination
248 * @dest_port: port number of the destination
249 * @type: type of message
251 * The flow control scheme is based around the low and high "watermarks". When
252 * the low watermark is passed the confirm_rx flag is set on the outgoing
253 * message, which will trigger the remote to send a control message of the type
254 * QRTR_TYPE_RESUME_TX to reset the counter. If the high watermark is hit
255 * further transmision should be paused.
257 * Return: 1 if confirm_rx should be set, 0 otherwise or errno failure
259 static int qrtr_tx_wait(struct qrtr_node *node, int dest_node, int dest_port,
262 unsigned long key = (u64)dest_node << 32 | dest_port;
263 struct qrtr_tx_flow *flow;
267 /* Never set confirm_rx on non-data packets */
268 if (type != QRTR_TYPE_DATA)
271 mutex_lock(&node->qrtr_tx_lock);
272 flow = radix_tree_lookup(&node->qrtr_tx_flow, key);
274 flow = kzalloc(sizeof(*flow), GFP_KERNEL);
276 init_waitqueue_head(&flow->resume_tx);
277 if (radix_tree_insert(&node->qrtr_tx_flow, key, flow)) {
283 mutex_unlock(&node->qrtr_tx_lock);
285 /* Set confirm_rx if we where unable to find and allocate a flow */
289 spin_lock_irq(&flow->resume_tx.lock);
290 ret = wait_event_interruptible_locked_irq(flow->resume_tx,
291 flow->pending < QRTR_TX_FLOW_HIGH ||
296 } else if (!node->ep) {
298 } else if (flow->tx_failed) {
303 confirm_rx = flow->pending == QRTR_TX_FLOW_LOW;
305 spin_unlock_irq(&flow->resume_tx.lock);
311 * qrtr_tx_flow_failed() - flag that tx of confirm_rx flagged messages failed
312 * @node: qrtr_node that the packet is to be send to
313 * @dest_node: node id of the destination
314 * @dest_port: port number of the destination
316 * Signal that the transmission of a message with confirm_rx flag failed. The
317 * flow's "pending" counter will keep incrementing towards QRTR_TX_FLOW_HIGH,
318 * at which point transmission would stall forever waiting for the resume TX
319 * message associated with the dropped confirm_rx message.
320 * Work around this by marking the flow as having a failed transmission and
321 * cause the next transmission attempt to be sent with the confirm_rx.
323 static void qrtr_tx_flow_failed(struct qrtr_node *node, int dest_node,
326 unsigned long key = (u64)dest_node << 32 | dest_port;
327 struct qrtr_tx_flow *flow;
330 flow = radix_tree_lookup(&node->qrtr_tx_flow, key);
333 spin_lock_irq(&flow->resume_tx.lock);
335 spin_unlock_irq(&flow->resume_tx.lock);
339 /* Pass an outgoing packet socket buffer to the endpoint driver. */
340 static int qrtr_node_enqueue(struct qrtr_node *node, struct sk_buff *skb,
341 int type, struct sockaddr_qrtr *from,
342 struct sockaddr_qrtr *to)
344 struct qrtr_hdr_v1 *hdr;
345 size_t len = skb->len;
348 confirm_rx = qrtr_tx_wait(node, to->sq_node, to->sq_port, type);
349 if (confirm_rx < 0) {
354 hdr = skb_push(skb, sizeof(*hdr));
355 hdr->version = cpu_to_le32(QRTR_PROTO_VER_1);
356 hdr->type = cpu_to_le32(type);
357 hdr->src_node_id = cpu_to_le32(from->sq_node);
358 hdr->src_port_id = cpu_to_le32(from->sq_port);
359 if (to->sq_port == QRTR_PORT_CTRL) {
360 hdr->dst_node_id = cpu_to_le32(node->nid);
361 hdr->dst_port_id = cpu_to_le32(QRTR_PORT_CTRL);
363 hdr->dst_node_id = cpu_to_le32(to->sq_node);
364 hdr->dst_port_id = cpu_to_le32(to->sq_port);
367 hdr->size = cpu_to_le32(len);
368 hdr->confirm_rx = !!confirm_rx;
370 rc = skb_put_padto(skb, ALIGN(len, 4) + sizeof(*hdr));
373 mutex_lock(&node->ep_lock);
376 rc = node->ep->xmit(node->ep, skb);
379 mutex_unlock(&node->ep_lock);
381 /* Need to ensure that a subsequent message carries the otherwise lost
382 * confirm_rx flag if we dropped this one */
383 if (rc && confirm_rx)
384 qrtr_tx_flow_failed(node, to->sq_node, to->sq_port);
389 /* Lookup node by id.
391 * callers must release with qrtr_node_release()
393 static struct qrtr_node *qrtr_node_lookup(unsigned int nid)
395 struct qrtr_node *node;
398 mutex_lock(&qrtr_node_lock);
399 spin_lock_irqsave(&qrtr_nodes_lock, flags);
400 node = radix_tree_lookup(&qrtr_nodes, nid);
401 node = qrtr_node_acquire(node);
402 spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
403 mutex_unlock(&qrtr_node_lock);
408 /* Assign node id to node.
410 * This is mostly useful for automatic node id assignment, based on
411 * the source id in the incoming packet.
413 static void qrtr_node_assign(struct qrtr_node *node, unsigned int nid)
417 if (nid == QRTR_EP_NID_AUTO)
420 spin_lock_irqsave(&qrtr_nodes_lock, flags);
421 radix_tree_insert(&qrtr_nodes, nid, node);
422 if (node->nid == QRTR_EP_NID_AUTO)
424 spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
428 * qrtr_endpoint_post() - post incoming data
429 * @ep: endpoint handle
430 * @data: data pointer
431 * @len: size of data in bytes
433 * Return: 0 on success; negative error code on failure
435 int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len)
437 struct qrtr_node *node = ep->node;
438 const struct qrtr_hdr_v1 *v1;
439 const struct qrtr_hdr_v2 *v2;
440 struct qrtr_sock *ipc;
447 if (len == 0 || len & 3)
450 skb = __netdev_alloc_skb(NULL, len, GFP_ATOMIC | __GFP_NOWARN);
454 cb = (struct qrtr_cb *)skb->cb;
456 /* Version field in v1 is little endian, so this works for both cases */
460 case QRTR_PROTO_VER_1:
461 if (len < sizeof(*v1))
464 hdrlen = sizeof(*v1);
466 cb->type = le32_to_cpu(v1->type);
467 cb->src_node = le32_to_cpu(v1->src_node_id);
468 cb->src_port = le32_to_cpu(v1->src_port_id);
469 cb->confirm_rx = !!v1->confirm_rx;
470 cb->dst_node = le32_to_cpu(v1->dst_node_id);
471 cb->dst_port = le32_to_cpu(v1->dst_port_id);
473 size = le32_to_cpu(v1->size);
475 case QRTR_PROTO_VER_2:
476 if (len < sizeof(*v2))
479 hdrlen = sizeof(*v2) + v2->optlen;
482 cb->confirm_rx = !!(v2->flags & QRTR_FLAGS_CONFIRM_RX);
483 cb->src_node = le16_to_cpu(v2->src_node_id);
484 cb->src_port = le16_to_cpu(v2->src_port_id);
485 cb->dst_node = le16_to_cpu(v2->dst_node_id);
486 cb->dst_port = le16_to_cpu(v2->dst_port_id);
488 if (cb->src_port == (u16)QRTR_PORT_CTRL)
489 cb->src_port = QRTR_PORT_CTRL;
490 if (cb->dst_port == (u16)QRTR_PORT_CTRL)
491 cb->dst_port = QRTR_PORT_CTRL;
493 size = le32_to_cpu(v2->size);
496 pr_err("qrtr: Invalid version %d\n", ver);
500 if (cb->dst_port == QRTR_PORT_CTRL_LEGACY)
501 cb->dst_port = QRTR_PORT_CTRL;
503 if (!size || len != ALIGN(size, 4) + hdrlen)
506 if ((cb->type == QRTR_TYPE_NEW_SERVER ||
507 cb->type == QRTR_TYPE_RESUME_TX) &&
508 size < sizeof(struct qrtr_ctrl_pkt))
511 if (cb->dst_port != QRTR_PORT_CTRL && cb->type != QRTR_TYPE_DATA &&
512 cb->type != QRTR_TYPE_RESUME_TX)
515 skb_put_data(skb, data + hdrlen, size);
517 qrtr_node_assign(node, cb->src_node);
519 if (cb->type == QRTR_TYPE_NEW_SERVER) {
520 /* Remote node endpoint can bridge other distant nodes */
521 const struct qrtr_ctrl_pkt *pkt;
524 qrtr_node_assign(node, le32_to_cpu(pkt->server.node));
527 if (cb->type == QRTR_TYPE_RESUME_TX) {
528 qrtr_tx_resume(node, skb);
530 ipc = qrtr_port_lookup(cb->dst_port);
534 if (sock_queue_rcv_skb(&ipc->sk, skb)) {
549 EXPORT_SYMBOL_GPL(qrtr_endpoint_post);
552 * qrtr_alloc_ctrl_packet() - allocate control packet skb
553 * @pkt: reference to qrtr_ctrl_pkt pointer
554 * @flags: the type of memory to allocate
556 * Returns newly allocated sk_buff, or NULL on failure
558 * This function allocates a sk_buff large enough to carry a qrtr_ctrl_pkt and
559 * on success returns a reference to the control packet in @pkt.
561 static struct sk_buff *qrtr_alloc_ctrl_packet(struct qrtr_ctrl_pkt **pkt,
564 const int pkt_len = sizeof(struct qrtr_ctrl_pkt);
567 skb = alloc_skb(QRTR_HDR_MAX_SIZE + pkt_len, flags);
571 skb_reserve(skb, QRTR_HDR_MAX_SIZE);
572 *pkt = skb_put_zero(skb, pkt_len);
578 * qrtr_endpoint_register() - register a new endpoint
579 * @ep: endpoint to register
580 * @nid: desired node id; may be QRTR_EP_NID_AUTO for auto-assignment
581 * Return: 0 on success; negative error code on failure
583 * The specified endpoint must have the xmit function pointer set on call.
585 int qrtr_endpoint_register(struct qrtr_endpoint *ep, unsigned int nid)
587 struct qrtr_node *node;
589 if (!ep || !ep->xmit)
592 node = kzalloc(sizeof(*node), GFP_KERNEL);
596 kref_init(&node->ref);
597 mutex_init(&node->ep_lock);
598 skb_queue_head_init(&node->rx_queue);
599 node->nid = QRTR_EP_NID_AUTO;
602 INIT_RADIX_TREE(&node->qrtr_tx_flow, GFP_KERNEL);
603 mutex_init(&node->qrtr_tx_lock);
605 qrtr_node_assign(node, nid);
607 mutex_lock(&qrtr_node_lock);
608 list_add(&node->item, &qrtr_all_nodes);
609 mutex_unlock(&qrtr_node_lock);
614 EXPORT_SYMBOL_GPL(qrtr_endpoint_register);
617 * qrtr_endpoint_unregister - unregister endpoint
618 * @ep: endpoint to unregister
620 void qrtr_endpoint_unregister(struct qrtr_endpoint *ep)
622 struct qrtr_node *node = ep->node;
623 struct sockaddr_qrtr src = {AF_QIPCRTR, node->nid, QRTR_PORT_CTRL};
624 struct sockaddr_qrtr dst = {AF_QIPCRTR, qrtr_local_nid, QRTR_PORT_CTRL};
625 struct radix_tree_iter iter;
626 struct qrtr_ctrl_pkt *pkt;
627 struct qrtr_tx_flow *flow;
632 mutex_lock(&node->ep_lock);
634 mutex_unlock(&node->ep_lock);
636 /* Notify the local controller about the event */
637 spin_lock_irqsave(&qrtr_nodes_lock, flags);
638 radix_tree_for_each_slot(slot, &qrtr_nodes, &iter, 0) {
641 src.sq_node = iter.index;
642 skb = qrtr_alloc_ctrl_packet(&pkt, GFP_ATOMIC);
644 pkt->cmd = cpu_to_le32(QRTR_TYPE_BYE);
645 qrtr_local_enqueue(NULL, skb, QRTR_TYPE_BYE, &src, &dst);
648 spin_unlock_irqrestore(&qrtr_nodes_lock, flags);
650 /* Wake up any transmitters waiting for resume-tx from the node */
651 mutex_lock(&node->qrtr_tx_lock);
652 radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) {
654 wake_up_interruptible_all(&flow->resume_tx);
656 mutex_unlock(&node->qrtr_tx_lock);
658 qrtr_node_release(node);
661 EXPORT_SYMBOL_GPL(qrtr_endpoint_unregister);
663 /* Lookup socket by port.
665 * Callers must release with qrtr_port_put()
667 static struct qrtr_sock *qrtr_port_lookup(int port)
669 struct qrtr_sock *ipc;
671 if (port == QRTR_PORT_CTRL)
675 ipc = xa_load(&qrtr_ports, port);
683 /* Release acquired socket. */
684 static void qrtr_port_put(struct qrtr_sock *ipc)
689 /* Remove port assignment. */
690 static void qrtr_port_remove(struct qrtr_sock *ipc)
692 struct qrtr_ctrl_pkt *pkt;
694 int port = ipc->us.sq_port;
695 struct sockaddr_qrtr to;
697 to.sq_family = AF_QIPCRTR;
698 to.sq_node = QRTR_NODE_BCAST;
699 to.sq_port = QRTR_PORT_CTRL;
701 skb = qrtr_alloc_ctrl_packet(&pkt, GFP_KERNEL);
703 pkt->cmd = cpu_to_le32(QRTR_TYPE_DEL_CLIENT);
704 pkt->client.node = cpu_to_le32(ipc->us.sq_node);
705 pkt->client.port = cpu_to_le32(ipc->us.sq_port);
707 skb_set_owner_w(skb, &ipc->sk);
708 qrtr_bcast_enqueue(NULL, skb, QRTR_TYPE_DEL_CLIENT, &ipc->us,
712 if (port == QRTR_PORT_CTRL)
715 __sock_put(&ipc->sk);
717 xa_erase(&qrtr_ports, port);
719 /* Ensure that if qrtr_port_lookup() did enter the RCU read section we
720 * wait for it to up increment the refcount */
724 /* Assign port number to socket.
726 * Specify port in the integer pointed to by port, and it will be adjusted
727 * on return as necesssary.
730 * 0: Assign ephemeral port in [QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET]
731 * <QRTR_MIN_EPH_SOCKET: Specified; requires CAP_NET_ADMIN
732 * >QRTR_MIN_EPH_SOCKET: Specified; available to all
734 static int qrtr_port_assign(struct qrtr_sock *ipc, int *port)
739 rc = xa_alloc(&qrtr_ports, port, ipc, QRTR_EPH_PORT_RANGE,
741 } else if (*port < QRTR_MIN_EPH_SOCKET && !capable(CAP_NET_ADMIN)) {
743 } else if (*port == QRTR_PORT_CTRL) {
744 rc = xa_insert(&qrtr_ports, 0, ipc, GFP_KERNEL);
746 rc = xa_insert(&qrtr_ports, *port, ipc, GFP_KERNEL);
759 /* Reset all non-control ports */
760 static void qrtr_reset_ports(void)
762 struct qrtr_sock *ipc;
766 xa_for_each_start(&qrtr_ports, index, ipc, 1) {
768 ipc->sk.sk_err = ENETRESET;
769 sk_error_report(&ipc->sk);
775 /* Bind socket to address.
777 * Socket should be locked upon call.
779 static int __qrtr_bind(struct socket *sock,
780 const struct sockaddr_qrtr *addr, int zapped)
782 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
783 struct sock *sk = sock->sk;
788 if (!zapped && addr->sq_port == ipc->us.sq_port)
791 port = addr->sq_port;
792 rc = qrtr_port_assign(ipc, &port);
796 /* unbind previous, if any */
798 qrtr_port_remove(ipc);
799 ipc->us.sq_port = port;
801 sock_reset_flag(sk, SOCK_ZAPPED);
803 /* Notify all open ports about the new controller */
804 if (port == QRTR_PORT_CTRL)
810 /* Auto bind to an ephemeral port. */
811 static int qrtr_autobind(struct socket *sock)
813 struct sock *sk = sock->sk;
814 struct sockaddr_qrtr addr;
816 if (!sock_flag(sk, SOCK_ZAPPED))
819 addr.sq_family = AF_QIPCRTR;
820 addr.sq_node = qrtr_local_nid;
823 return __qrtr_bind(sock, &addr, 1);
826 /* Bind socket to specified sockaddr. */
827 static int qrtr_bind(struct socket *sock, struct sockaddr *saddr, int len)
829 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr);
830 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
831 struct sock *sk = sock->sk;
834 if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR)
837 if (addr->sq_node != ipc->us.sq_node)
841 rc = __qrtr_bind(sock, addr, sock_flag(sk, SOCK_ZAPPED));
847 /* Queue packet to local peer socket. */
848 static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb,
849 int type, struct sockaddr_qrtr *from,
850 struct sockaddr_qrtr *to)
852 struct qrtr_sock *ipc;
855 ipc = qrtr_port_lookup(to->sq_port);
856 if (!ipc || &ipc->sk == skb->sk) { /* do not send to self */
863 cb = (struct qrtr_cb *)skb->cb;
864 cb->src_node = from->sq_node;
865 cb->src_port = from->sq_port;
867 if (sock_queue_rcv_skb(&ipc->sk, skb)) {
878 /* Queue packet for broadcast. */
879 static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb,
880 int type, struct sockaddr_qrtr *from,
881 struct sockaddr_qrtr *to)
883 struct sk_buff *skbn;
885 mutex_lock(&qrtr_node_lock);
886 list_for_each_entry(node, &qrtr_all_nodes, item) {
887 skbn = skb_clone(skb, GFP_KERNEL);
890 skb_set_owner_w(skbn, skb->sk);
891 qrtr_node_enqueue(node, skbn, type, from, to);
893 mutex_unlock(&qrtr_node_lock);
895 qrtr_local_enqueue(NULL, skb, type, from, to);
900 static int qrtr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
902 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name);
903 int (*enqueue_fn)(struct qrtr_node *, struct sk_buff *, int,
904 struct sockaddr_qrtr *, struct sockaddr_qrtr *);
905 __le32 qrtr_type = cpu_to_le32(QRTR_TYPE_DATA);
906 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
907 struct sock *sk = sock->sk;
908 struct qrtr_node *node;
914 if (msg->msg_flags & ~(MSG_DONTWAIT))
923 if (msg->msg_namelen < sizeof(*addr)) {
928 if (addr->sq_family != AF_QIPCRTR) {
933 rc = qrtr_autobind(sock);
938 } else if (sk->sk_state == TCP_ESTABLISHED) {
946 if (addr->sq_node == QRTR_NODE_BCAST) {
947 if (addr->sq_port != QRTR_PORT_CTRL &&
948 qrtr_local_nid != QRTR_NODE_BCAST) {
952 enqueue_fn = qrtr_bcast_enqueue;
953 } else if (addr->sq_node == ipc->us.sq_node) {
954 enqueue_fn = qrtr_local_enqueue;
956 node = qrtr_node_lookup(addr->sq_node);
961 enqueue_fn = qrtr_node_enqueue;
964 plen = (len + 3) & ~3;
965 skb = sock_alloc_send_skb(sk, plen + QRTR_HDR_MAX_SIZE,
966 msg->msg_flags & MSG_DONTWAIT, &rc);
972 skb_reserve(skb, QRTR_HDR_MAX_SIZE);
974 rc = memcpy_from_msg(skb_put(skb, len), msg, len);
980 if (ipc->us.sq_port == QRTR_PORT_CTRL) {
987 /* control messages already require the type as 'command' */
988 skb_copy_bits(skb, 0, &qrtr_type, 4);
991 type = le32_to_cpu(qrtr_type);
992 rc = enqueue_fn(node, skb, type, &ipc->us, addr);
997 qrtr_node_release(node);
1003 static int qrtr_send_resume_tx(struct qrtr_cb *cb)
1005 struct sockaddr_qrtr remote = { AF_QIPCRTR, cb->src_node, cb->src_port };
1006 struct sockaddr_qrtr local = { AF_QIPCRTR, cb->dst_node, cb->dst_port };
1007 struct qrtr_ctrl_pkt *pkt;
1008 struct qrtr_node *node;
1009 struct sk_buff *skb;
1012 node = qrtr_node_lookup(remote.sq_node);
1016 skb = qrtr_alloc_ctrl_packet(&pkt, GFP_KERNEL);
1020 pkt->cmd = cpu_to_le32(QRTR_TYPE_RESUME_TX);
1021 pkt->client.node = cpu_to_le32(cb->dst_node);
1022 pkt->client.port = cpu_to_le32(cb->dst_port);
1024 ret = qrtr_node_enqueue(node, skb, QRTR_TYPE_RESUME_TX, &local, &remote);
1026 qrtr_node_release(node);
1031 static int qrtr_recvmsg(struct socket *sock, struct msghdr *msg,
1032 size_t size, int flags)
1034 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name);
1035 struct sock *sk = sock->sk;
1036 struct sk_buff *skb;
1042 if (sock_flag(sk, SOCK_ZAPPED)) {
1044 return -EADDRNOTAVAIL;
1047 skb = skb_recv_datagram(sk, flags, &rc);
1052 cb = (struct qrtr_cb *)skb->cb;
1055 if (copied > size) {
1057 msg->msg_flags |= MSG_TRUNC;
1060 rc = skb_copy_datagram_msg(skb, 0, msg, copied);
1066 /* There is an anonymous 2-byte hole after sq_family,
1067 * make sure to clear it.
1069 memset(addr, 0, sizeof(*addr));
1071 addr->sq_family = AF_QIPCRTR;
1072 addr->sq_node = cb->src_node;
1073 addr->sq_port = cb->src_port;
1074 msg->msg_namelen = sizeof(*addr);
1079 qrtr_send_resume_tx(cb);
1081 skb_free_datagram(sk, skb);
1087 static int qrtr_connect(struct socket *sock, struct sockaddr *saddr,
1090 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr);
1091 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
1092 struct sock *sk = sock->sk;
1095 if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR)
1100 sk->sk_state = TCP_CLOSE;
1101 sock->state = SS_UNCONNECTED;
1103 rc = qrtr_autobind(sock);
1110 sock->state = SS_CONNECTED;
1111 sk->sk_state = TCP_ESTABLISHED;
1118 static int qrtr_getname(struct socket *sock, struct sockaddr *saddr,
1121 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
1122 struct sockaddr_qrtr qaddr;
1123 struct sock *sk = sock->sk;
1127 if (sk->sk_state != TCP_ESTABLISHED) {
1138 qaddr.sq_family = AF_QIPCRTR;
1140 memcpy(saddr, &qaddr, sizeof(qaddr));
1142 return sizeof(qaddr);
1145 static int qrtr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1147 void __user *argp = (void __user *)arg;
1148 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
1149 struct sock *sk = sock->sk;
1150 struct sockaddr_qrtr *sq;
1151 struct sk_buff *skb;
1160 len = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
1163 rc = put_user(len, (int __user *)argp);
1166 skb = skb_peek(&sk->sk_receive_queue);
1169 rc = put_user(len, (int __user *)argp);
1172 if (get_user_ifreq(&ifr, NULL, argp)) {
1177 sq = (struct sockaddr_qrtr *)&ifr.ifr_addr;
1179 if (put_user_ifreq(&ifr, argp)) {
1187 case SIOCGIFDSTADDR:
1188 case SIOCSIFDSTADDR:
1189 case SIOCGIFBRDADDR:
1190 case SIOCSIFBRDADDR:
1191 case SIOCGIFNETMASK:
1192 case SIOCSIFNETMASK:
1205 static int qrtr_release(struct socket *sock)
1207 struct sock *sk = sock->sk;
1208 struct qrtr_sock *ipc;
1216 sk->sk_shutdown = SHUTDOWN_MASK;
1217 if (!sock_flag(sk, SOCK_DEAD))
1218 sk->sk_state_change(sk);
1220 sock_set_flag(sk, SOCK_DEAD);
1224 if (!sock_flag(sk, SOCK_ZAPPED))
1225 qrtr_port_remove(ipc);
1227 skb_queue_purge(&sk->sk_receive_queue);
1235 static const struct proto_ops qrtr_proto_ops = {
1236 .owner = THIS_MODULE,
1237 .family = AF_QIPCRTR,
1239 .connect = qrtr_connect,
1240 .socketpair = sock_no_socketpair,
1241 .accept = sock_no_accept,
1242 .listen = sock_no_listen,
1243 .sendmsg = qrtr_sendmsg,
1244 .recvmsg = qrtr_recvmsg,
1245 .getname = qrtr_getname,
1246 .ioctl = qrtr_ioctl,
1247 .gettstamp = sock_gettstamp,
1248 .poll = datagram_poll,
1249 .shutdown = sock_no_shutdown,
1250 .release = qrtr_release,
1251 .mmap = sock_no_mmap,
1254 static struct proto qrtr_proto = {
1256 .owner = THIS_MODULE,
1257 .obj_size = sizeof(struct qrtr_sock),
1260 static int qrtr_create(struct net *net, struct socket *sock,
1261 int protocol, int kern)
1263 struct qrtr_sock *ipc;
1266 if (sock->type != SOCK_DGRAM)
1269 sk = sk_alloc(net, AF_QIPCRTR, GFP_KERNEL, &qrtr_proto, kern);
1273 sock_set_flag(sk, SOCK_ZAPPED);
1275 sock_init_data(sock, sk);
1276 sock->ops = &qrtr_proto_ops;
1279 ipc->us.sq_family = AF_QIPCRTR;
1280 ipc->us.sq_node = qrtr_local_nid;
1281 ipc->us.sq_port = 0;
1286 static const struct net_proto_family qrtr_family = {
1287 .owner = THIS_MODULE,
1288 .family = AF_QIPCRTR,
1289 .create = qrtr_create,
1292 static int __init qrtr_proto_init(void)
1296 rc = proto_register(&qrtr_proto, 1);
1300 rc = sock_register(&qrtr_family);
1304 rc = qrtr_ns_init();
1311 sock_unregister(qrtr_family.family);
1313 proto_unregister(&qrtr_proto);
1316 postcore_initcall(qrtr_proto_init);
1318 static void __exit qrtr_proto_fini(void)
1321 sock_unregister(qrtr_family.family);
1322 proto_unregister(&qrtr_proto);
1324 module_exit(qrtr_proto_fini);
1326 MODULE_DESCRIPTION("Qualcomm IPC-router driver");
1327 MODULE_LICENSE("GPL v2");
1328 MODULE_ALIAS_NETPROTO(PF_QIPCRTR);