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mm: make try_to_munlock() return void
[linux/fpc-iii.git] / net / qrtr / qrtr.c
bloba9a8c7d5a4a983b9be12fe85a7f71f3e6a825f19
1 /*
2 * Copyright (c) 2015, Sony Mobile Communications Inc.
3 * Copyright (c) 2013, The Linux Foundation. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 and
7 * only version 2 as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14 #include <linux/module.h>
15 #include <linux/netlink.h>
16 #include <linux/qrtr.h>
17 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
18
19 #include <net/sock.h>
20
21 #include "qrtr.h"
22
23 #define QRTR_PROTO_VER 1
24
25 /* auto-bind range */
26 #define QRTR_MIN_EPH_SOCKET 0x4000
27 #define QRTR_MAX_EPH_SOCKET 0x7fff
28
29 enum qrtr_pkt_type {
30 QRTR_TYPE_DATA = 1,
31 QRTR_TYPE_HELLO = 2,
32 QRTR_TYPE_BYE = 3,
33 QRTR_TYPE_NEW_SERVER = 4,
34 QRTR_TYPE_DEL_SERVER = 5,
35 QRTR_TYPE_DEL_CLIENT = 6,
36 QRTR_TYPE_RESUME_TX = 7,
37 QRTR_TYPE_EXIT = 8,
38 QRTR_TYPE_PING = 9,
39 };
40
41 /**
42 * struct qrtr_hdr - (I|R)PCrouter packet header
43 * @version: protocol version
44 * @type: packet type; one of QRTR_TYPE_*
45 * @src_node_id: source node
46 * @src_port_id: source port
47 * @confirm_rx: boolean; whether a resume-tx packet should be send in reply
48 * @size: length of packet, excluding this header
49 * @dst_node_id: destination node
50 * @dst_port_id: destination port
51 */
52 struct qrtr_hdr {
53 __le32 version;
54 __le32 type;
55 __le32 src_node_id;
56 __le32 src_port_id;
57 __le32 confirm_rx;
58 __le32 size;
59 __le32 dst_node_id;
60 __le32 dst_port_id;
61 } __packed;
62
63 #define QRTR_HDR_SIZE sizeof(struct qrtr_hdr)
64 #define QRTR_NODE_BCAST ((unsigned int)-1)
65 #define QRTR_PORT_CTRL ((unsigned int)-2)
66
67 struct qrtr_sock {
68 /* WARNING: sk must be the first member */
69 struct sock sk;
70 struct sockaddr_qrtr us;
71 struct sockaddr_qrtr peer;
72 };
73
74 static inline struct qrtr_sock *qrtr_sk(struct sock *sk)
75 {
76 BUILD_BUG_ON(offsetof(struct qrtr_sock, sk) != 0);
77 return container_of(sk, struct qrtr_sock, sk);
78 }
79
80 static unsigned int qrtr_local_nid = -1;
81
82 /* for node ids */
83 static RADIX_TREE(qrtr_nodes, GFP_KERNEL);
84 /* broadcast list */
85 static LIST_HEAD(qrtr_all_nodes);
86 /* lock for qrtr_nodes, qrtr_all_nodes and node reference */
87 static DEFINE_MUTEX(qrtr_node_lock);
88
89 /* local port allocation management */
90 static DEFINE_IDR(qrtr_ports);
91 static DEFINE_MUTEX(qrtr_port_lock);
92
93 /**
94 * struct qrtr_node - endpoint node
95 * @ep_lock: lock for endpoint management and callbacks
96 * @ep: endpoint
97 * @ref: reference count for node
98 * @nid: node id
99 * @rx_queue: receive queue
100 * @work: scheduled work struct for recv work
101 * @item: list item for broadcast list
102 */
103 struct qrtr_node {
104 struct mutex ep_lock;
105 struct qrtr_endpoint *ep;
106 struct kref ref;
107 unsigned int nid;
108
109 struct sk_buff_head rx_queue;
110 struct work_struct work;
111 struct list_head item;
112 };
113
114 /* Release node resources and free the node.
115 *
116 * Do not call directly, use qrtr_node_release. To be used with
117 * kref_put_mutex. As such, the node mutex is expected to be locked on call.
118 */
119 static void __qrtr_node_release(struct kref *kref)
120 {
121 struct qrtr_node *node = container_of(kref, struct qrtr_node, ref);
122
123 if (node->nid != QRTR_EP_NID_AUTO)
124 radix_tree_delete(&qrtr_nodes, node->nid);
125
126 list_del(&node->item);
127 mutex_unlock(&qrtr_node_lock);
128
129 skb_queue_purge(&node->rx_queue);
130 kfree(node);
131 }
132
133 /* Increment reference to node. */
134 static struct qrtr_node *qrtr_node_acquire(struct qrtr_node *node)
135 {
136 if (node)
137 kref_get(&node->ref);
138 return node;
139 }
140
141 /* Decrement reference to node and release as necessary. */
142 static void qrtr_node_release(struct qrtr_node *node)
143 {
144 if (!node)
145 return;
146 kref_put_mutex(&node->ref, __qrtr_node_release, &qrtr_node_lock);
147 }
148
149 /* Pass an outgoing packet socket buffer to the endpoint driver. */
150 static int qrtr_node_enqueue(struct qrtr_node *node, struct sk_buff *skb)
151 {
152 int rc = -ENODEV;
153
154 mutex_lock(&node->ep_lock);
155 if (node->ep)
156 rc = node->ep->xmit(node->ep, skb);
157 else
158 kfree_skb(skb);
159 mutex_unlock(&node->ep_lock);
160
161 return rc;
162 }
163
164 /* Lookup node by id.
165 *
166 * callers must release with qrtr_node_release()
167 */
168 static struct qrtr_node *qrtr_node_lookup(unsigned int nid)
169 {
170 struct qrtr_node *node;
171
172 mutex_lock(&qrtr_node_lock);
173 node = radix_tree_lookup(&qrtr_nodes, nid);
174 node = qrtr_node_acquire(node);
175 mutex_unlock(&qrtr_node_lock);
176
177 return node;
178 }
179
180 /* Assign node id to node.
181 *
182 * This is mostly useful for automatic node id assignment, based on
183 * the source id in the incoming packet.
184 */
185 static void qrtr_node_assign(struct qrtr_node *node, unsigned int nid)
186 {
187 if (node->nid != QRTR_EP_NID_AUTO || nid == QRTR_EP_NID_AUTO)
188 return;
189
190 mutex_lock(&qrtr_node_lock);
191 radix_tree_insert(&qrtr_nodes, nid, node);
192 node->nid = nid;
193 mutex_unlock(&qrtr_node_lock);
194 }
195
196 /**
197 * qrtr_endpoint_post() - post incoming data
198 * @ep: endpoint handle
199 * @data: data pointer
200 * @len: size of data in bytes
201 *
202 * Return: 0 on success; negative error code on failure
203 */
204 int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len)
205 {
206 struct qrtr_node *node = ep->node;
207 const struct qrtr_hdr *phdr = data;
208 struct sk_buff *skb;
209 unsigned int psize;
210 unsigned int size;
211 unsigned int type;
212 unsigned int ver;
213 unsigned int dst;
214
215 if (len < QRTR_HDR_SIZE || len & 3)
216 return -EINVAL;
217
218 ver = le32_to_cpu(phdr->version);
219 size = le32_to_cpu(phdr->size);
220 type = le32_to_cpu(phdr->type);
221 dst = le32_to_cpu(phdr->dst_port_id);
222
223 psize = (size + 3) & ~3;
224
225 if (ver != QRTR_PROTO_VER)
226 return -EINVAL;
227
228 if (len != psize + QRTR_HDR_SIZE)
229 return -EINVAL;
230
231 if (dst != QRTR_PORT_CTRL && type != QRTR_TYPE_DATA)
232 return -EINVAL;
233
234 skb = netdev_alloc_skb(NULL, len);
235 if (!skb)
236 return -ENOMEM;
237
238 skb_reset_transport_header(skb);
239 memcpy(skb_put(skb, len), data, len);
240
241 skb_queue_tail(&node->rx_queue, skb);
242 schedule_work(&node->work);
243
244 return 0;
245 }
246 EXPORT_SYMBOL_GPL(qrtr_endpoint_post);
247
248 /* Allocate and construct a resume-tx packet. */
249 static struct sk_buff *qrtr_alloc_resume_tx(u32 src_node,
250 u32 dst_node, u32 port)
251 {
252 const int pkt_len = 20;
253 struct qrtr_hdr *hdr;
254 struct sk_buff *skb;
255 __le32 *buf;
256
257 skb = alloc_skb(QRTR_HDR_SIZE + pkt_len, GFP_KERNEL);
258 if (!skb)
259 return NULL;
260 skb_reset_transport_header(skb);
261
262 hdr = (struct qrtr_hdr *)skb_put(skb, QRTR_HDR_SIZE);
263 hdr->version = cpu_to_le32(QRTR_PROTO_VER);
264 hdr->type = cpu_to_le32(QRTR_TYPE_RESUME_TX);
265 hdr->src_node_id = cpu_to_le32(src_node);
266 hdr->src_port_id = cpu_to_le32(QRTR_PORT_CTRL);
267 hdr->confirm_rx = cpu_to_le32(0);
268 hdr->size = cpu_to_le32(pkt_len);
269 hdr->dst_node_id = cpu_to_le32(dst_node);
270 hdr->dst_port_id = cpu_to_le32(QRTR_PORT_CTRL);
271
272 buf = (__le32 *)skb_put(skb, pkt_len);
273 memset(buf, 0, pkt_len);
274 buf[0] = cpu_to_le32(QRTR_TYPE_RESUME_TX);
275 buf[1] = cpu_to_le32(src_node);
276 buf[2] = cpu_to_le32(port);
277
278 return skb;
279 }
280
281 static struct qrtr_sock *qrtr_port_lookup(int port);
282 static void qrtr_port_put(struct qrtr_sock *ipc);
283
284 /* Handle and route a received packet.
285 *
286 * This will auto-reply with resume-tx packet as necessary.
287 */
288 static void qrtr_node_rx_work(struct work_struct *work)
289 {
290 struct qrtr_node *node = container_of(work, struct qrtr_node, work);
291 struct sk_buff *skb;
292
293 while ((skb = skb_dequeue(&node->rx_queue)) != NULL) {
294 const struct qrtr_hdr *phdr;
295 u32 dst_node, dst_port;
296 struct qrtr_sock *ipc;
297 u32 src_node;
298 int confirm;
299
300 phdr = (const struct qrtr_hdr *)skb_transport_header(skb);
301 src_node = le32_to_cpu(phdr->src_node_id);
302 dst_node = le32_to_cpu(phdr->dst_node_id);
303 dst_port = le32_to_cpu(phdr->dst_port_id);
304 confirm = !!phdr->confirm_rx;
305
306 qrtr_node_assign(node, src_node);
307
308 ipc = qrtr_port_lookup(dst_port);
309 if (!ipc) {
310 kfree_skb(skb);
311 } else {
312 if (sock_queue_rcv_skb(&ipc->sk, skb))
313 kfree_skb(skb);
314
315 qrtr_port_put(ipc);
316 }
317
318 if (confirm) {
319 skb = qrtr_alloc_resume_tx(dst_node, node->nid, dst_port);
320 if (!skb)
321 break;
322 if (qrtr_node_enqueue(node, skb))
323 break;
324 }
325 }
326 }
327
328 /**
329 * qrtr_endpoint_register() - register a new endpoint
330 * @ep: endpoint to register
331 * @nid: desired node id; may be QRTR_EP_NID_AUTO for auto-assignment
332 * Return: 0 on success; negative error code on failure
333 *
334 * The specified endpoint must have the xmit function pointer set on call.
335 */
336 int qrtr_endpoint_register(struct qrtr_endpoint *ep, unsigned int nid)
337 {
338 struct qrtr_node *node;
339
340 if (!ep || !ep->xmit)
341 return -EINVAL;
342
343 node = kzalloc(sizeof(*node), GFP_KERNEL);
344 if (!node)
345 return -ENOMEM;
346
347 INIT_WORK(&node->work, qrtr_node_rx_work);
348 kref_init(&node->ref);
349 mutex_init(&node->ep_lock);
350 skb_queue_head_init(&node->rx_queue);
351 node->nid = QRTR_EP_NID_AUTO;
352 node->ep = ep;
353
354 qrtr_node_assign(node, nid);
355
356 mutex_lock(&qrtr_node_lock);
357 list_add(&node->item, &qrtr_all_nodes);
358 mutex_unlock(&qrtr_node_lock);
359 ep->node = node;
360
361 return 0;
362 }
363 EXPORT_SYMBOL_GPL(qrtr_endpoint_register);
364
365 /**
366 * qrtr_endpoint_unregister - unregister endpoint
367 * @ep: endpoint to unregister
368 */
369 void qrtr_endpoint_unregister(struct qrtr_endpoint *ep)
370 {
371 struct qrtr_node *node = ep->node;
372
373 mutex_lock(&node->ep_lock);
374 node->ep = NULL;
375 mutex_unlock(&node->ep_lock);
376
377 qrtr_node_release(node);
378 ep->node = NULL;
379 }
380 EXPORT_SYMBOL_GPL(qrtr_endpoint_unregister);
381
382 /* Lookup socket by port.
383 *
384 * Callers must release with qrtr_port_put()
385 */
386 static struct qrtr_sock *qrtr_port_lookup(int port)
387 {
388 struct qrtr_sock *ipc;
389
390 if (port == QRTR_PORT_CTRL)
391 port = 0;
392
393 mutex_lock(&qrtr_port_lock);
394 ipc = idr_find(&qrtr_ports, port);
395 if (ipc)
396 sock_hold(&ipc->sk);
397 mutex_unlock(&qrtr_port_lock);
398
399 return ipc;
400 }
401
402 /* Release acquired socket. */
403 static void qrtr_port_put(struct qrtr_sock *ipc)
404 {
405 sock_put(&ipc->sk);
406 }
407
408 /* Remove port assignment. */
409 static void qrtr_port_remove(struct qrtr_sock *ipc)
410 {
411 int port = ipc->us.sq_port;
412
413 if (port == QRTR_PORT_CTRL)
414 port = 0;
415
416 __sock_put(&ipc->sk);
417
418 mutex_lock(&qrtr_port_lock);
419 idr_remove(&qrtr_ports, port);
420 mutex_unlock(&qrtr_port_lock);
421 }
422
423 /* Assign port number to socket.
424 *
425 * Specify port in the integer pointed to by port, and it will be adjusted
426 * on return as necesssary.
427 *
428 * Port may be:
429 * 0: Assign ephemeral port in [QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET]
430 * <QRTR_MIN_EPH_SOCKET: Specified; requires CAP_NET_ADMIN
431 * >QRTR_MIN_EPH_SOCKET: Specified; available to all
432 */
433 static int qrtr_port_assign(struct qrtr_sock *ipc, int *port)
434 {
435 int rc;
436
437 mutex_lock(&qrtr_port_lock);
438 if (!*port) {
439 rc = idr_alloc(&qrtr_ports, ipc,
440 QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET + 1,
441 GFP_ATOMIC);
442 if (rc >= 0)
443 *port = rc;
444 } else if (*port < QRTR_MIN_EPH_SOCKET && !capable(CAP_NET_ADMIN)) {
445 rc = -EACCES;
446 } else if (*port == QRTR_PORT_CTRL) {
447 rc = idr_alloc(&qrtr_ports, ipc, 0, 1, GFP_ATOMIC);
448 } else {
449 rc = idr_alloc(&qrtr_ports, ipc, *port, *port + 1, GFP_ATOMIC);
450 if (rc >= 0)
451 *port = rc;
452 }
453 mutex_unlock(&qrtr_port_lock);
454
455 if (rc == -ENOSPC)
456 return -EADDRINUSE;
457 else if (rc < 0)
458 return rc;
459
460 sock_hold(&ipc->sk);
461
462 return 0;
463 }
464
465 /* Bind socket to address.
466 *
467 * Socket should be locked upon call.
468 */
469 static int __qrtr_bind(struct socket *sock,
470 const struct sockaddr_qrtr *addr, int zapped)
471 {
472 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
473 struct sock *sk = sock->sk;
474 int port;
475 int rc;
476
477 /* rebinding ok */
478 if (!zapped && addr->sq_port == ipc->us.sq_port)
479 return 0;
480
481 port = addr->sq_port;
482 rc = qrtr_port_assign(ipc, &port);
483 if (rc)
484 return rc;
485
486 /* unbind previous, if any */
487 if (!zapped)
488 qrtr_port_remove(ipc);
489 ipc->us.sq_port = port;
490
491 sock_reset_flag(sk, SOCK_ZAPPED);
492
493 return 0;
494 }
495
496 /* Auto bind to an ephemeral port. */
497 static int qrtr_autobind(struct socket *sock)
498 {
499 struct sock *sk = sock->sk;
500 struct sockaddr_qrtr addr;
501
502 if (!sock_flag(sk, SOCK_ZAPPED))
503 return 0;
504
505 addr.sq_family = AF_QIPCRTR;
506 addr.sq_node = qrtr_local_nid;
507 addr.sq_port = 0;
508
509 return __qrtr_bind(sock, &addr, 1);
510 }
511
512 /* Bind socket to specified sockaddr. */
513 static int qrtr_bind(struct socket *sock, struct sockaddr *saddr, int len)
514 {
515 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr);
516 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
517 struct sock *sk = sock->sk;
518 int rc;
519
520 if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR)
521 return -EINVAL;
522
523 if (addr->sq_node != ipc->us.sq_node)
524 return -EINVAL;
525
526 lock_sock(sk);
527 rc = __qrtr_bind(sock, addr, sock_flag(sk, SOCK_ZAPPED));
528 release_sock(sk);
529
530 return rc;
531 }
532
533 /* Queue packet to local peer socket. */
534 static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb)
535 {
536 const struct qrtr_hdr *phdr;
537 struct qrtr_sock *ipc;
538
539 phdr = (const struct qrtr_hdr *)skb_transport_header(skb);
540
541 ipc = qrtr_port_lookup(le32_to_cpu(phdr->dst_port_id));
542 if (!ipc || &ipc->sk == skb->sk) { /* do not send to self */
543 kfree_skb(skb);
544 return -ENODEV;
545 }
546
547 if (sock_queue_rcv_skb(&ipc->sk, skb)) {
548 qrtr_port_put(ipc);
549 kfree_skb(skb);
550 return -ENOSPC;
551 }
552
553 qrtr_port_put(ipc);
554
555 return 0;
556 }
557
558 /* Queue packet for broadcast. */
559 static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb)
560 {
561 struct sk_buff *skbn;
562
563 mutex_lock(&qrtr_node_lock);
564 list_for_each_entry(node, &qrtr_all_nodes, item) {
565 skbn = skb_clone(skb, GFP_KERNEL);
566 if (!skbn)
567 break;
568 skb_set_owner_w(skbn, skb->sk);
569 qrtr_node_enqueue(node, skbn);
570 }
571 mutex_unlock(&qrtr_node_lock);
572
573 qrtr_local_enqueue(node, skb);
574
575 return 0;
576 }
577
578 static int qrtr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
579 {
580 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name);
581 int (*enqueue_fn)(struct qrtr_node *, struct sk_buff *);
582 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
583 struct sock *sk = sock->sk;
584 struct qrtr_node *node;
585 struct qrtr_hdr *hdr;
586 struct sk_buff *skb;
587 size_t plen;
588 int rc;
589
590 if (msg->msg_flags & ~(MSG_DONTWAIT))
591 return -EINVAL;
592
593 if (len > 65535)
594 return -EMSGSIZE;
595
596 lock_sock(sk);
597
598 if (addr) {
599 if (msg->msg_namelen < sizeof(*addr)) {
600 release_sock(sk);
601 return -EINVAL;
602 }
603
604 if (addr->sq_family != AF_QIPCRTR) {
605 release_sock(sk);
606 return -EINVAL;
607 }
608
609 rc = qrtr_autobind(sock);
610 if (rc) {
611 release_sock(sk);
612 return rc;
613 }
614 } else if (sk->sk_state == TCP_ESTABLISHED) {
615 addr = &ipc->peer;
616 } else {
617 release_sock(sk);
618 return -ENOTCONN;
619 }
620
621 node = NULL;
622 if (addr->sq_node == QRTR_NODE_BCAST) {
623 enqueue_fn = qrtr_bcast_enqueue;
624 } else if (addr->sq_node == ipc->us.sq_node) {
625 enqueue_fn = qrtr_local_enqueue;
626 } else {
627 enqueue_fn = qrtr_node_enqueue;
628 node = qrtr_node_lookup(addr->sq_node);
629 if (!node) {
630 release_sock(sk);
631 return -ECONNRESET;
632 }
633 }
634
635 plen = (len + 3) & ~3;
636 skb = sock_alloc_send_skb(sk, plen + QRTR_HDR_SIZE,
637 msg->msg_flags & MSG_DONTWAIT, &rc);
638 if (!skb)
639 goto out_node;
640
641 skb_reset_transport_header(skb);
642 skb_put(skb, len + QRTR_HDR_SIZE);
643
644 hdr = (struct qrtr_hdr *)skb_transport_header(skb);
645 hdr->version = cpu_to_le32(QRTR_PROTO_VER);
646 hdr->src_node_id = cpu_to_le32(ipc->us.sq_node);
647 hdr->src_port_id = cpu_to_le32(ipc->us.sq_port);
648 hdr->confirm_rx = cpu_to_le32(0);
649 hdr->size = cpu_to_le32(len);
650 hdr->dst_node_id = cpu_to_le32(addr->sq_node);
651 hdr->dst_port_id = cpu_to_le32(addr->sq_port);
652
653 rc = skb_copy_datagram_from_iter(skb, QRTR_HDR_SIZE,
654 &msg->msg_iter, len);
655 if (rc) {
656 kfree_skb(skb);
657 goto out_node;
658 }
659
660 if (plen != len) {
661 rc = skb_pad(skb, plen - len);
662 if (rc)
663 goto out_node;
664 skb_put(skb, plen - len);
665 }
666
667 if (ipc->us.sq_port == QRTR_PORT_CTRL) {
668 if (len < 4) {
669 rc = -EINVAL;
670 kfree_skb(skb);
671 goto out_node;
672 }
673
674 /* control messages already require the type as 'command' */
675 skb_copy_bits(skb, QRTR_HDR_SIZE, &hdr->type, 4);
676 } else {
677 hdr->type = cpu_to_le32(QRTR_TYPE_DATA);
678 }
679
680 rc = enqueue_fn(node, skb);
681 if (rc >= 0)
682 rc = len;
683
684 out_node:
685 qrtr_node_release(node);
686 release_sock(sk);
687
688 return rc;
689 }
690
691 static int qrtr_recvmsg(struct socket *sock, struct msghdr *msg,
692 size_t size, int flags)
693 {
694 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name);
695 const struct qrtr_hdr *phdr;
696 struct sock *sk = sock->sk;
697 struct sk_buff *skb;
698 int copied, rc;
699
700 lock_sock(sk);
701
702 if (sock_flag(sk, SOCK_ZAPPED)) {
703 release_sock(sk);
704 return -EADDRNOTAVAIL;
705 }
706
707 skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
708 flags & MSG_DONTWAIT, &rc);
709 if (!skb) {
710 release_sock(sk);
711 return rc;
712 }
713
714 phdr = (const struct qrtr_hdr *)skb_transport_header(skb);
715 copied = le32_to_cpu(phdr->size);
716 if (copied > size) {
717 copied = size;
718 msg->msg_flags |= MSG_TRUNC;
719 }
720
721 rc = skb_copy_datagram_msg(skb, QRTR_HDR_SIZE, msg, copied);
722 if (rc < 0)
723 goto out;
724 rc = copied;
725
726 if (addr) {
727 addr->sq_family = AF_QIPCRTR;
728 addr->sq_node = le32_to_cpu(phdr->src_node_id);
729 addr->sq_port = le32_to_cpu(phdr->src_port_id);
730 msg->msg_namelen = sizeof(*addr);
731 }
732
733 out:
734 skb_free_datagram(sk, skb);
735 release_sock(sk);
736
737 return rc;
738 }
739
740 static int qrtr_connect(struct socket *sock, struct sockaddr *saddr,
741 int len, int flags)
742 {
743 DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr);
744 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
745 struct sock *sk = sock->sk;
746 int rc;
747
748 if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR)
749 return -EINVAL;
750
751 lock_sock(sk);
752
753 sk->sk_state = TCP_CLOSE;
754 sock->state = SS_UNCONNECTED;
755
756 rc = qrtr_autobind(sock);
757 if (rc) {
758 release_sock(sk);
759 return rc;
760 }
761
762 ipc->peer = *addr;
763 sock->state = SS_CONNECTED;
764 sk->sk_state = TCP_ESTABLISHED;
765
766 release_sock(sk);
767
768 return 0;
769 }
770
771 static int qrtr_getname(struct socket *sock, struct sockaddr *saddr,
772 int *len, int peer)
773 {
774 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
775 struct sockaddr_qrtr qaddr;
776 struct sock *sk = sock->sk;
777
778 lock_sock(sk);
779 if (peer) {
780 if (sk->sk_state != TCP_ESTABLISHED) {
781 release_sock(sk);
782 return -ENOTCONN;
783 }
784
785 qaddr = ipc->peer;
786 } else {
787 qaddr = ipc->us;
788 }
789 release_sock(sk);
790
791 *len = sizeof(qaddr);
792 qaddr.sq_family = AF_QIPCRTR;
793
794 memcpy(saddr, &qaddr, sizeof(qaddr));
795
796 return 0;
797 }
798
799 static int qrtr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
800 {
801 void __user *argp = (void __user *)arg;
802 struct qrtr_sock *ipc = qrtr_sk(sock->sk);
803 struct sock *sk = sock->sk;
804 struct sockaddr_qrtr *sq;
805 struct sk_buff *skb;
806 struct ifreq ifr;
807 long len = 0;
808 int rc = 0;
809
810 lock_sock(sk);
811
812 switch (cmd) {
813 case TIOCOUTQ:
814 len = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
815 if (len < 0)
816 len = 0;
817 rc = put_user(len, (int __user *)argp);
818 break;
819 case TIOCINQ:
820 skb = skb_peek(&sk->sk_receive_queue);
821 if (skb)
822 len = skb->len - QRTR_HDR_SIZE;
823 rc = put_user(len, (int __user *)argp);
824 break;
825 case SIOCGIFADDR:
826 if (copy_from_user(&ifr, argp, sizeof(ifr))) {
827 rc = -EFAULT;
828 break;
829 }
830
831 sq = (struct sockaddr_qrtr *)&ifr.ifr_addr;
832 *sq = ipc->us;
833 if (copy_to_user(argp, &ifr, sizeof(ifr))) {
834 rc = -EFAULT;
835 break;
836 }
837 break;
838 case SIOCGSTAMP:
839 rc = sock_get_timestamp(sk, argp);
840 break;
841 case SIOCADDRT:
842 case SIOCDELRT:
843 case SIOCSIFADDR:
844 case SIOCGIFDSTADDR:
845 case SIOCSIFDSTADDR:
846 case SIOCGIFBRDADDR:
847 case SIOCSIFBRDADDR:
848 case SIOCGIFNETMASK:
849 case SIOCSIFNETMASK:
850 rc = -EINVAL;
851 break;
852 default:
853 rc = -ENOIOCTLCMD;
854 break;
855 }
856
857 release_sock(sk);
858
859 return rc;
860 }
861
862 static int qrtr_release(struct socket *sock)
863 {
864 struct sock *sk = sock->sk;
865 struct qrtr_sock *ipc;
866
867 if (!sk)
868 return 0;
869
870 lock_sock(sk);
871
872 ipc = qrtr_sk(sk);
873 sk->sk_shutdown = SHUTDOWN_MASK;
874 if (!sock_flag(sk, SOCK_DEAD))
875 sk->sk_state_change(sk);
876
877 sock_set_flag(sk, SOCK_DEAD);
878 sock->sk = NULL;
879
880 if (!sock_flag(sk, SOCK_ZAPPED))
881 qrtr_port_remove(ipc);
882
883 skb_queue_purge(&sk->sk_receive_queue);
884
885 release_sock(sk);
886 sock_put(sk);
887
888 return 0;
889 }
890
891 static const struct proto_ops qrtr_proto_ops = {
892 .owner = THIS_MODULE,
893 .family = AF_QIPCRTR,
894 .bind = qrtr_bind,
895 .connect = qrtr_connect,
896 .socketpair = sock_no_socketpair,
897 .accept = sock_no_accept,
898 .listen = sock_no_listen,
899 .sendmsg = qrtr_sendmsg,
900 .recvmsg = qrtr_recvmsg,
901 .getname = qrtr_getname,
902 .ioctl = qrtr_ioctl,
903 .poll = datagram_poll,
904 .shutdown = sock_no_shutdown,
905 .setsockopt = sock_no_setsockopt,
906 .getsockopt = sock_no_getsockopt,
907 .release = qrtr_release,
908 .mmap = sock_no_mmap,
909 .sendpage = sock_no_sendpage,
910 };
911
912 static struct proto qrtr_proto = {
913 .name = "QIPCRTR",
914 .owner = THIS_MODULE,
915 .obj_size = sizeof(struct qrtr_sock),
916 };
917
918 static int qrtr_create(struct net *net, struct socket *sock,
919 int protocol, int kern)
920 {
921 struct qrtr_sock *ipc;
922 struct sock *sk;
923
924 if (sock->type != SOCK_DGRAM)
925 return -EPROTOTYPE;
926
927 sk = sk_alloc(net, AF_QIPCRTR, GFP_KERNEL, &qrtr_proto, kern);
928 if (!sk)
929 return -ENOMEM;
930
931 sock_set_flag(sk, SOCK_ZAPPED);
932
933 sock_init_data(sock, sk);
934 sock->ops = &qrtr_proto_ops;
935
936 ipc = qrtr_sk(sk);
937 ipc->us.sq_family = AF_QIPCRTR;
938 ipc->us.sq_node = qrtr_local_nid;
939 ipc->us.sq_port = 0;
940
941 return 0;
942 }
943
944 static const struct nla_policy qrtr_policy[IFA_MAX + 1] = {
945 [IFA_LOCAL] = { .type = NLA_U32 },
946 };
947
948 static int qrtr_addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
949 struct netlink_ext_ack *extack)
950 {
951 struct nlattr *tb[IFA_MAX + 1];
952 struct ifaddrmsg *ifm;
953 int rc;
954
955 if (!netlink_capable(skb, CAP_NET_ADMIN))
956 return -EPERM;
957
958 if (!netlink_capable(skb, CAP_SYS_ADMIN))
959 return -EPERM;
960
961 ASSERT_RTNL();
962
963 rc = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, qrtr_policy, extack);
964 if (rc < 0)
965 return rc;
966
967 ifm = nlmsg_data(nlh);
968 if (!tb[IFA_LOCAL])
969 return -EINVAL;
970
971 qrtr_local_nid = nla_get_u32(tb[IFA_LOCAL]);
972 return 0;
973 }
974
975 static const struct net_proto_family qrtr_family = {
976 .owner = THIS_MODULE,
977 .family = AF_QIPCRTR,
978 .create = qrtr_create,
979 };
980
981 static int __init qrtr_proto_init(void)
982 {
983 int rc;
984
985 rc = proto_register(&qrtr_proto, 1);
986 if (rc)
987 return rc;
988
989 rc = sock_register(&qrtr_family);
990 if (rc) {
991 proto_unregister(&qrtr_proto);
992 return rc;
993 }
994
995 rtnl_register(PF_QIPCRTR, RTM_NEWADDR, qrtr_addr_doit, NULL, NULL);
996
997 return 0;
998 }
999 module_init(qrtr_proto_init);
1000
1001 static void __exit qrtr_proto_fini(void)
1002 {
1003 rtnl_unregister(PF_QIPCRTR, RTM_NEWADDR);
1004 sock_unregister(qrtr_family.family);
1005 proto_unregister(&qrtr_proto);
1006 }
1007 module_exit(qrtr_proto_fini);
1008
1009 MODULE_DESCRIPTION("Qualcomm IPC-router driver");
1010 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support