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TOMOYO Linux Cross Reference
Linux/net/qrtr/qrtr.c

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.11 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.84 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.154 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.201 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.201 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.77 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 1
 24 #define QRTR_PROTO_VER_2 3
 25 
 26 /* auto-bind range */
 27 #define QRTR_MIN_EPH_SOCKET 0x4000
 28 #define QRTR_MAX_EPH_SOCKET 0x7fff
 29 
 30 /**
 31  * struct qrtr_hdr_v1 - (I|R)PCrouter packet header version 1
 32  * @version: protocol version
 33  * @type: packet type; one of QRTR_TYPE_*
 34  * @src_node_id: source node
 35  * @src_port_id: source port
 36  * @confirm_rx: boolean; whether a resume-tx packet should be send in reply
 37  * @size: length of packet, excluding this header
 38  * @dst_node_id: destination node
 39  * @dst_port_id: destination port
 40  */
 41 struct qrtr_hdr_v1 {
 42         __le32 version;
 43         __le32 type;
 44         __le32 src_node_id;
 45         __le32 src_port_id;
 46         __le32 confirm_rx;
 47         __le32 size;
 48         __le32 dst_node_id;
 49         __le32 dst_port_id;
 50 } __packed;
 51 
 52 /**
 53  * struct qrtr_hdr_v2 - (I|R)PCrouter packet header later versions
 54  * @version: protocol version
 55  * @type: packet type; one of QRTR_TYPE_*
 56  * @flags: bitmask of QRTR_FLAGS_*
 57  * @optlen: length of optional header data
 58  * @size: length of packet, excluding this header and optlen
 59  * @src_node_id: source node
 60  * @src_port_id: source port
 61  * @dst_node_id: destination node
 62  * @dst_port_id: destination port
 63  */
 64 struct qrtr_hdr_v2 {
 65         u8 version;
 66         u8 type;
 67         u8 flags;
 68         u8 optlen;
 69         __le32 size;
 70         __le16 src_node_id;
 71         __le16 src_port_id;
 72         __le16 dst_node_id;
 73         __le16 dst_port_id;
 74 };
 75 
 76 #define QRTR_FLAGS_CONFIRM_RX   BIT(0)
 77 
 78 struct qrtr_cb {
 79         u32 src_node;
 80         u32 src_port;
 81         u32 dst_node;
 82         u32 dst_port;
 83 
 84         u8 type;
 85         u8 confirm_rx;
 86 };
 87 
 88 #define QRTR_HDR_MAX_SIZE max_t(size_t, sizeof(struct qrtr_hdr_v1), \
 89                                         sizeof(struct qrtr_hdr_v2))
 90 
 91 struct qrtr_sock {
 92         /* WARNING: sk must be the first member */
 93         struct sock sk;
 94         struct sockaddr_qrtr us;
 95         struct sockaddr_qrtr peer;
 96 };
 97 
 98 static inline struct qrtr_sock *qrtr_sk(struct sock *sk)
 99 {
100         BUILD_BUG_ON(offsetof(struct qrtr_sock, sk) != 0);
101         return container_of(sk, struct qrtr_sock, sk);
102 }
103 
104 static unsigned int qrtr_local_nid = -1;
105 
106 /* for node ids */
107 static RADIX_TREE(qrtr_nodes, GFP_KERNEL);
108 /* broadcast list */
109 static LIST_HEAD(qrtr_all_nodes);
110 /* lock for qrtr_nodes, qrtr_all_nodes and node reference */
111 static DEFINE_MUTEX(qrtr_node_lock);
112 
113 /* local port allocation management */
114 static DEFINE_IDR(qrtr_ports);
115 static DEFINE_MUTEX(qrtr_port_lock);
116 
117 /**
118  * struct qrtr_node - endpoint node
119  * @ep_lock: lock for endpoint management and callbacks
120  * @ep: endpoint
121  * @ref: reference count for node
122  * @nid: node id
123  * @rx_queue: receive queue
124  * @work: scheduled work struct for recv work
125  * @item: list item for broadcast list
126  */
127 struct qrtr_node {
128         struct mutex ep_lock;
129         struct qrtr_endpoint *ep;
130         struct kref ref;
131         unsigned int nid;
132 
133         struct sk_buff_head rx_queue;
134         struct work_struct work;
135         struct list_head item;
136 };
137 
138 static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb,
139                               int type, struct sockaddr_qrtr *from,
140                               struct sockaddr_qrtr *to);
141 static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb,
142                               int type, struct sockaddr_qrtr *from,
143                               struct sockaddr_qrtr *to);
144 
145 /* Release node resources and free the node.
146  *
147  * Do not call directly, use qrtr_node_release.  To be used with
148  * kref_put_mutex.  As such, the node mutex is expected to be locked on call.
149  */
150 static void __qrtr_node_release(struct kref *kref)
151 {
152         struct qrtr_node *node = container_of(kref, struct qrtr_node, ref);
153 
154         if (node->nid != QRTR_EP_NID_AUTO)
155                 radix_tree_delete(&qrtr_nodes, node->nid);
156 
157         list_del(&node->item);
158         mutex_unlock(&qrtr_node_lock);
159 
160         skb_queue_purge(&node->rx_queue);
161         kfree(node);
162 }
163 
164 /* Increment reference to node. */
165 static struct qrtr_node *qrtr_node_acquire(struct qrtr_node *node)
166 {
167         if (node)
168                 kref_get(&node->ref);
169         return node;
170 }
171 
172 /* Decrement reference to node and release as necessary. */
173 static void qrtr_node_release(struct qrtr_node *node)
174 {
175         if (!node)
176                 return;
177         kref_put_mutex(&node->ref, __qrtr_node_release, &qrtr_node_lock);
178 }
179 
180 /* Pass an outgoing packet socket buffer to the endpoint driver. */
181 static int qrtr_node_enqueue(struct qrtr_node *node, struct sk_buff *skb,
182                              int type, struct sockaddr_qrtr *from,
183                              struct sockaddr_qrtr *to)
184 {
185         struct qrtr_hdr_v1 *hdr;
186         size_t len = skb->len;
187         int rc = -ENODEV;
188 
189         hdr = skb_push(skb, sizeof(*hdr));
190         hdr->version = cpu_to_le32(QRTR_PROTO_VER_1);
191         hdr->type = cpu_to_le32(type);
192         hdr->src_node_id = cpu_to_le32(from->sq_node);
193         hdr->src_port_id = cpu_to_le32(from->sq_port);
194         hdr->dst_node_id = cpu_to_le32(to->sq_node);
195         hdr->dst_port_id = cpu_to_le32(to->sq_port);
196 
197         hdr->size = cpu_to_le32(len);
198         hdr->confirm_rx = 0;
199 
200         skb_put_padto(skb, ALIGN(len, 4));
201 
202         mutex_lock(&node->ep_lock);
203         if (node->ep)
204                 rc = node->ep->xmit(node->ep, skb);
205         else
206                 kfree_skb(skb);
207         mutex_unlock(&node->ep_lock);
208 
209         return rc;
210 }
211 
212 /* Lookup node by id.
213  *
214  * callers must release with qrtr_node_release()
215  */
216 static struct qrtr_node *qrtr_node_lookup(unsigned int nid)
217 {
218         struct qrtr_node *node;
219 
220         mutex_lock(&qrtr_node_lock);
221         node = radix_tree_lookup(&qrtr_nodes, nid);
222         node = qrtr_node_acquire(node);
223         mutex_unlock(&qrtr_node_lock);
224 
225         return node;
226 }
227 
228 /* Assign node id to node.
229  *
230  * This is mostly useful for automatic node id assignment, based on
231  * the source id in the incoming packet.
232  */
233 static void qrtr_node_assign(struct qrtr_node *node, unsigned int nid)
234 {
235         if (node->nid != QRTR_EP_NID_AUTO || nid == QRTR_EP_NID_AUTO)
236                 return;
237 
238         mutex_lock(&qrtr_node_lock);
239         radix_tree_insert(&qrtr_nodes, nid, node);
240         node->nid = nid;
241         mutex_unlock(&qrtr_node_lock);
242 }
243 
244 /**
245  * qrtr_endpoint_post() - post incoming data
246  * @ep: endpoint handle
247  * @data: data pointer
248  * @len: size of data in bytes
249  *
250  * Return: 0 on success; negative error code on failure
251  */
252 int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len)
253 {
254         struct qrtr_node *node = ep->node;
255         const struct qrtr_hdr_v1 *v1;
256         const struct qrtr_hdr_v2 *v2;
257         struct sk_buff *skb;
258         struct qrtr_cb *cb;
259         unsigned int size;
260         unsigned int ver;
261         size_t hdrlen;
262 
263         if (len & 3)
264                 return -EINVAL;
265 
266         skb = netdev_alloc_skb(NULL, len);
267         if (!skb)
268                 return -ENOMEM;
269 
270         cb = (struct qrtr_cb *)skb->cb;
271 
272         /* Version field in v1 is little endian, so this works for both cases */
273         ver = *(u8*)data;
274 
275         switch (ver) {
276         case QRTR_PROTO_VER_1:
277                 v1 = data;
278                 hdrlen = sizeof(*v1);
279 
280                 cb->type = le32_to_cpu(v1->type);
281                 cb->src_node = le32_to_cpu(v1->src_node_id);
282                 cb->src_port = le32_to_cpu(v1->src_port_id);
283                 cb->confirm_rx = !!v1->confirm_rx;
284                 cb->dst_node = le32_to_cpu(v1->dst_node_id);
285                 cb->dst_port = le32_to_cpu(v1->dst_port_id);
286 
287                 size = le32_to_cpu(v1->size);
288                 break;
289         case QRTR_PROTO_VER_2:
290                 v2 = data;
291                 hdrlen = sizeof(*v2) + v2->optlen;
292 
293                 cb->type = v2->type;
294                 cb->confirm_rx = !!(v2->flags & QRTR_FLAGS_CONFIRM_RX);
295                 cb->src_node = le16_to_cpu(v2->src_node_id);
296                 cb->src_port = le16_to_cpu(v2->src_port_id);
297                 cb->dst_node = le16_to_cpu(v2->dst_node_id);
298                 cb->dst_port = le16_to_cpu(v2->dst_port_id);
299 
300                 if (cb->src_port == (u16)QRTR_PORT_CTRL)
301                         cb->src_port = QRTR_PORT_CTRL;
302                 if (cb->dst_port == (u16)QRTR_PORT_CTRL)
303                         cb->dst_port = QRTR_PORT_CTRL;
304 
305                 size = le32_to_cpu(v2->size);
306                 break;
307         default:
308                 pr_err("qrtr: Invalid version %d\n", ver);
309                 goto err;
310         }
311 
312         if (len != ALIGN(size, 4) + hdrlen)
313                 goto err;
314 
315         if (cb->dst_port != QRTR_PORT_CTRL && cb->type != QRTR_TYPE_DATA)
316                 goto err;
317 
318         skb_put_data(skb, data + hdrlen, size);
319 
320         skb_queue_tail(&node->rx_queue, skb);
321         schedule_work(&node->work);
322 
323         return 0;
324 
325 err:
326         kfree_skb(skb);
327         return -EINVAL;
328 
329 }
330 EXPORT_SYMBOL_GPL(qrtr_endpoint_post);
331 
332 /**
333  * qrtr_alloc_ctrl_packet() - allocate control packet skb
334  * @pkt: reference to qrtr_ctrl_pkt pointer
335  *
336  * Returns newly allocated sk_buff, or NULL on failure
337  *
338  * This function allocates a sk_buff large enough to carry a qrtr_ctrl_pkt and
339  * on success returns a reference to the control packet in @pkt.
340  */
341 static struct sk_buff *qrtr_alloc_ctrl_packet(struct qrtr_ctrl_pkt **pkt)
342 {
343         const int pkt_len = sizeof(struct qrtr_ctrl_pkt);
344         struct sk_buff *skb;
345 
346         skb = alloc_skb(QRTR_HDR_MAX_SIZE + pkt_len, GFP_KERNEL);
347         if (!skb)
348                 return NULL;
349 
350         skb_reserve(skb, QRTR_HDR_MAX_SIZE);
351         *pkt = skb_put_zero(skb, pkt_len);
352 
353         return skb;
354 }
355 
356 static struct qrtr_sock *qrtr_port_lookup(int port);
357 static void qrtr_port_put(struct qrtr_sock *ipc);
358 
359 /* Handle and route a received packet.
360  *
361  * This will auto-reply with resume-tx packet as necessary.
362  */
363 static void qrtr_node_rx_work(struct work_struct *work)
364 {
365         struct qrtr_node *node = container_of(work, struct qrtr_node, work);
366         struct qrtr_ctrl_pkt *pkt;
367         struct sockaddr_qrtr dst;
368         struct sockaddr_qrtr src;
369         struct sk_buff *skb;
370 
371         while ((skb = skb_dequeue(&node->rx_queue)) != NULL) {
372                 struct qrtr_sock *ipc;
373                 struct qrtr_cb *cb;
374                 int confirm;
375 
376                 cb = (struct qrtr_cb *)skb->cb;
377                 src.sq_node = cb->src_node;
378                 src.sq_port = cb->src_port;
379                 dst.sq_node = cb->dst_node;
380                 dst.sq_port = cb->dst_port;
381                 confirm = !!cb->confirm_rx;
382 
383                 qrtr_node_assign(node, cb->src_node);
384 
385                 ipc = qrtr_port_lookup(cb->dst_port);
386                 if (!ipc) {
387                         kfree_skb(skb);
388                 } else {
389                         if (sock_queue_rcv_skb(&ipc->sk, skb))
390                                 kfree_skb(skb);
391 
392                         qrtr_port_put(ipc);
393                 }
394 
395                 if (confirm) {
396                         skb = qrtr_alloc_ctrl_packet(&pkt);
397                         if (!skb)
398                                 break;
399 
400                         pkt->cmd = cpu_to_le32(QRTR_TYPE_RESUME_TX);
401                         pkt->client.node = cpu_to_le32(dst.sq_node);
402                         pkt->client.port = cpu_to_le32(dst.sq_port);
403 
404                         if (qrtr_node_enqueue(node, skb, QRTR_TYPE_RESUME_TX,
405                                               &dst, &src))
406                                 break;
407                 }
408         }
409 }
410 
411 /**
412  * qrtr_endpoint_register() - register a new endpoint
413  * @ep: endpoint to register
414  * @nid: desired node id; may be QRTR_EP_NID_AUTO for auto-assignment
415  * Return: 0 on success; negative error code on failure
416  *
417  * The specified endpoint must have the xmit function pointer set on call.
418  */
419 int qrtr_endpoint_register(struct qrtr_endpoint *ep, unsigned int nid)
420 {
421         struct qrtr_node *node;
422 
423         if (!ep || !ep->xmit)
424                 return -EINVAL;
425 
426         node = kzalloc(sizeof(*node), GFP_KERNEL);
427         if (!node)
428                 return -ENOMEM;
429 
430         INIT_WORK(&node->work, qrtr_node_rx_work);
431         kref_init(&node->ref);
432         mutex_init(&node->ep_lock);
433         skb_queue_head_init(&node->rx_queue);
434         node->nid = QRTR_EP_NID_AUTO;
435         node->ep = ep;
436 
437         qrtr_node_assign(node, nid);
438 
439         mutex_lock(&qrtr_node_lock);
440         list_add(&node->item, &qrtr_all_nodes);
441         mutex_unlock(&qrtr_node_lock);
442         ep->node = node;
443 
444         return 0;
445 }
446 EXPORT_SYMBOL_GPL(qrtr_endpoint_register);
447 
448 /**
449  * qrtr_endpoint_unregister - unregister endpoint
450  * @ep: endpoint to unregister
451  */
452 void qrtr_endpoint_unregister(struct qrtr_endpoint *ep)
453 {
454         struct qrtr_node *node = ep->node;
455         struct sockaddr_qrtr src = {AF_QIPCRTR, node->nid, QRTR_PORT_CTRL};
456         struct sockaddr_qrtr dst = {AF_QIPCRTR, qrtr_local_nid, QRTR_PORT_CTRL};
457         struct qrtr_ctrl_pkt *pkt;
458         struct sk_buff *skb;
459 
460         mutex_lock(&node->ep_lock);
461         node->ep = NULL;
462         mutex_unlock(&node->ep_lock);
463 
464         /* Notify the local controller about the event */
465         skb = qrtr_alloc_ctrl_packet(&pkt);
466         if (skb) {
467                 pkt->cmd = cpu_to_le32(QRTR_TYPE_BYE);
468                 qrtr_local_enqueue(NULL, skb, QRTR_TYPE_BYE, &src, &dst);
469         }
470 
471         qrtr_node_release(node);
472         ep->node = NULL;
473 }
474 EXPORT_SYMBOL_GPL(qrtr_endpoint_unregister);
475 
476 /* Lookup socket by port.
477  *
478  * Callers must release with qrtr_port_put()
479  */
480 static struct qrtr_sock *qrtr_port_lookup(int port)
481 {
482         struct qrtr_sock *ipc;
483 
484         if (port == QRTR_PORT_CTRL)
485                 port = 0;
486 
487         mutex_lock(&qrtr_port_lock);
488         ipc = idr_find(&qrtr_ports, port);
489         if (ipc)
490                 sock_hold(&ipc->sk);
491         mutex_unlock(&qrtr_port_lock);
492 
493         return ipc;
494 }
495 
496 /* Release acquired socket. */
497 static void qrtr_port_put(struct qrtr_sock *ipc)
498 {
499         sock_put(&ipc->sk);
500 }
501 
502 /* Remove port assignment. */
503 static void qrtr_port_remove(struct qrtr_sock *ipc)
504 {
505         struct qrtr_ctrl_pkt *pkt;
506         struct sk_buff *skb;
507         int port = ipc->us.sq_port;
508         struct sockaddr_qrtr to;
509 
510         to.sq_family = AF_QIPCRTR;
511         to.sq_node = QRTR_NODE_BCAST;
512         to.sq_port = QRTR_PORT_CTRL;
513 
514         skb = qrtr_alloc_ctrl_packet(&pkt);
515         if (skb) {
516                 pkt->cmd = cpu_to_le32(QRTR_TYPE_DEL_CLIENT);
517                 pkt->client.node = cpu_to_le32(ipc->us.sq_node);
518                 pkt->client.port = cpu_to_le32(ipc->us.sq_port);
519 
520                 skb_set_owner_w(skb, &ipc->sk);
521                 qrtr_bcast_enqueue(NULL, skb, QRTR_TYPE_DEL_CLIENT, &ipc->us,
522                                    &to);
523         }
524 
525         if (port == QRTR_PORT_CTRL)
526                 port = 0;
527 
528         __sock_put(&ipc->sk);
529 
530         mutex_lock(&qrtr_port_lock);
531         idr_remove(&qrtr_ports, port);
532         mutex_unlock(&qrtr_port_lock);
533 }
534 
535 /* Assign port number to socket.
536  *
537  * Specify port in the integer pointed to by port, and it will be adjusted
538  * on return as necesssary.
539  *
540  * Port may be:
541  *   0: Assign ephemeral port in [QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET]
542  *   <QRTR_MIN_EPH_SOCKET: Specified; requires CAP_NET_ADMIN
543  *   >QRTR_MIN_EPH_SOCKET: Specified; available to all
544  */
545 static int qrtr_port_assign(struct qrtr_sock *ipc, int *port)
546 {
547         int rc;
548 
549         mutex_lock(&qrtr_port_lock);
550         if (!*port) {
551                 rc = idr_alloc(&qrtr_ports, ipc,
552                                QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET + 1,
553                                GFP_ATOMIC);
554                 if (rc >= 0)
555                         *port = rc;
556         } else if (*port < QRTR_MIN_EPH_SOCKET && !capable(CAP_NET_ADMIN)) {
557                 rc = -EACCES;
558         } else if (*port == QRTR_PORT_CTRL) {
559                 rc = idr_alloc(&qrtr_ports, ipc, 0, 1, GFP_ATOMIC);
560         } else {
561                 rc = idr_alloc(&qrtr_ports, ipc, *port, *port + 1, GFP_ATOMIC);
562                 if (rc >= 0)
563                         *port = rc;
564         }
565         mutex_unlock(&qrtr_port_lock);
566 
567         if (rc == -ENOSPC)
568                 return -EADDRINUSE;
569         else if (rc < 0)
570                 return rc;
571 
572         sock_hold(&ipc->sk);
573 
574         return 0;
575 }
576 
577 /* Reset all non-control ports */
578 static void qrtr_reset_ports(void)
579 {
580         struct qrtr_sock *ipc;
581         int id;
582 
583         mutex_lock(&qrtr_port_lock);
584         idr_for_each_entry(&qrtr_ports, ipc, id) {
585                 /* Don't reset control port */
586                 if (id == 0)
587                         continue;
588 
589                 sock_hold(&ipc->sk);
590                 ipc->sk.sk_err = ENETRESET;
591                 ipc->sk.sk_error_report(&ipc->sk);
592                 sock_put(&ipc->sk);
593         }
594         mutex_unlock(&qrtr_port_lock);
595 }
596 
597 /* Bind socket to address.
598  *
599  * Socket should be locked upon call.
600  */
601 static int __qrtr_bind(struct socket *sock,
602                        const struct sockaddr_qrtr *addr, int zapped)
603 {
604         struct qrtr_sock *ipc = qrtr_sk(sock->sk);
605         struct sock *sk = sock->sk;
606         int port;
607         int rc;
608 
609         /* rebinding ok */
610         if (!zapped && addr->sq_port == ipc->us.sq_port)
611                 return 0;
612 
613         port = addr->sq_port;
614         rc = qrtr_port_assign(ipc, &port);
615         if (rc)
616                 return rc;
617 
618         /* unbind previous, if any */
619         if (!zapped)
620                 qrtr_port_remove(ipc);
621         ipc->us.sq_port = port;
622 
623         sock_reset_flag(sk, SOCK_ZAPPED);
624 
625         /* Notify all open ports about the new controller */
626         if (port == QRTR_PORT_CTRL)
627                 qrtr_reset_ports();
628 
629         return 0;
630 }
631 
632 /* Auto bind to an ephemeral port. */
633 static int qrtr_autobind(struct socket *sock)
634 {
635         struct sock *sk = sock->sk;
636         struct sockaddr_qrtr addr;
637 
638         if (!sock_flag(sk, SOCK_ZAPPED))
639                 return 0;
640 
641         addr.sq_family = AF_QIPCRTR;
642         addr.sq_node = qrtr_local_nid;
643         addr.sq_port = 0;
644 
645         return __qrtr_bind(sock, &addr, 1);
646 }
647 
648 /* Bind socket to specified sockaddr. */
649 static int qrtr_bind(struct socket *sock, struct sockaddr *saddr, int len)
650 {
651         DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr);
652         struct qrtr_sock *ipc = qrtr_sk(sock->sk);
653         struct sock *sk = sock->sk;
654         int rc;
655 
656         if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR)
657                 return -EINVAL;
658 
659         if (addr->sq_node != ipc->us.sq_node)
660                 return -EINVAL;
661 
662         lock_sock(sk);
663         rc = __qrtr_bind(sock, addr, sock_flag(sk, SOCK_ZAPPED));
664         release_sock(sk);
665 
666         return rc;
667 }
668 
669 /* Queue packet to local peer socket. */
670 static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb,
671                               int type, struct sockaddr_qrtr *from,
672                               struct sockaddr_qrtr *to)
673 {
674         struct qrtr_sock *ipc;
675         struct qrtr_cb *cb;
676 
677         ipc = qrtr_port_lookup(to->sq_port);
678         if (!ipc || &ipc->sk == skb->sk) { /* do not send to self */
679                 kfree_skb(skb);
680                 return -ENODEV;
681         }
682 
683         cb = (struct qrtr_cb *)skb->cb;
684         cb->src_node = from->sq_node;
685         cb->src_port = from->sq_port;
686 
687         if (sock_queue_rcv_skb(&ipc->sk, skb)) {
688                 qrtr_port_put(ipc);
689                 kfree_skb(skb);
690                 return -ENOSPC;
691         }
692 
693         qrtr_port_put(ipc);
694 
695         return 0;
696 }
697 
698 /* Queue packet for broadcast. */
699 static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb,
700                               int type, struct sockaddr_qrtr *from,
701                               struct sockaddr_qrtr *to)
702 {
703         struct sk_buff *skbn;
704 
705         mutex_lock(&qrtr_node_lock);
706         list_for_each_entry(node, &qrtr_all_nodes, item) {
707                 skbn = skb_clone(skb, GFP_KERNEL);
708                 if (!skbn)
709                         break;
710                 skb_set_owner_w(skbn, skb->sk);
711                 qrtr_node_enqueue(node, skbn, type, from, to);
712         }
713         mutex_unlock(&qrtr_node_lock);
714 
715         qrtr_local_enqueue(node, skb, type, from, to);
716 
717         return 0;
718 }
719 
720 static int qrtr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
721 {
722         DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name);
723         int (*enqueue_fn)(struct qrtr_node *, struct sk_buff *, int,
724                           struct sockaddr_qrtr *, struct sockaddr_qrtr *);
725         struct qrtr_sock *ipc = qrtr_sk(sock->sk);
726         struct sock *sk = sock->sk;
727         struct qrtr_node *node;
728         struct sk_buff *skb;
729         size_t plen;
730         u32 type = QRTR_TYPE_DATA;
731         int rc;
732 
733         if (msg->msg_flags & ~(MSG_DONTWAIT))
734                 return -EINVAL;
735 
736         if (len > 65535)
737                 return -EMSGSIZE;
738 
739         lock_sock(sk);
740 
741         if (addr) {
742                 if (msg->msg_namelen < sizeof(*addr)) {
743                         release_sock(sk);
744                         return -EINVAL;
745                 }
746 
747                 if (addr->sq_family != AF_QIPCRTR) {
748                         release_sock(sk);
749                         return -EINVAL;
750                 }
751 
752                 rc = qrtr_autobind(sock);
753                 if (rc) {
754                         release_sock(sk);
755                         return rc;
756                 }
757         } else if (sk->sk_state == TCP_ESTABLISHED) {
758                 addr = &ipc->peer;
759         } else {
760                 release_sock(sk);
761                 return -ENOTCONN;
762         }
763 
764         node = NULL;
765         if (addr->sq_node == QRTR_NODE_BCAST) {
766                 enqueue_fn = qrtr_bcast_enqueue;
767         } else if (addr->sq_node == ipc->us.sq_node) {
768                 enqueue_fn = qrtr_local_enqueue;
769         } else {
770                 enqueue_fn = qrtr_node_enqueue;
771                 node = qrtr_node_lookup(addr->sq_node);
772                 if (!node) {
773                         release_sock(sk);
774                         return -ECONNRESET;
775                 }
776         }
777 
778         plen = (len + 3) & ~3;
779         skb = sock_alloc_send_skb(sk, plen + QRTR_HDR_MAX_SIZE,
780                                   msg->msg_flags & MSG_DONTWAIT, &rc);
781         if (!skb)
782                 goto out_node;
783 
784         skb_reserve(skb, QRTR_HDR_MAX_SIZE);
785 
786         rc = memcpy_from_msg(skb_put(skb, len), msg, len);
787         if (rc) {
788                 kfree_skb(skb);
789                 goto out_node;
790         }
791 
792         if (ipc->us.sq_port == QRTR_PORT_CTRL) {
793                 if (len < 4) {
794                         rc = -EINVAL;
795                         kfree_skb(skb);
796                         goto out_node;
797                 }
798 
799                 /* control messages already require the type as 'command' */
800                 skb_copy_bits(skb, 0, &type, 4);
801                 type = le32_to_cpu(type);
802         }
803 
804         rc = enqueue_fn(node, skb, type, &ipc->us, addr);
805         if (rc >= 0)
806                 rc = len;
807 
808 out_node:
809         qrtr_node_release(node);
810         release_sock(sk);
811 
812         return rc;
813 }
814 
815 static int qrtr_recvmsg(struct socket *sock, struct msghdr *msg,
816                         size_t size, int flags)
817 {
818         DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name);
819         struct sock *sk = sock->sk;
820         struct sk_buff *skb;
821         struct qrtr_cb *cb;
822         int copied, rc;
823 
824         lock_sock(sk);
825 
826         if (sock_flag(sk, SOCK_ZAPPED)) {
827                 release_sock(sk);
828                 return -EADDRNOTAVAIL;
829         }
830 
831         skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
832                                 flags & MSG_DONTWAIT, &rc);
833         if (!skb) {
834                 release_sock(sk);
835                 return rc;
836         }
837 
838         copied = skb->len;
839         if (copied > size) {
840                 copied = size;
841                 msg->msg_flags |= MSG_TRUNC;
842         }
843 
844         rc = skb_copy_datagram_msg(skb, 0, msg, copied);
845         if (rc < 0)
846                 goto out;
847         rc = copied;
848 
849         if (addr) {
850                 cb = (struct qrtr_cb *)skb->cb;
851                 addr->sq_family = AF_QIPCRTR;
852                 addr->sq_node = cb->src_node;
853                 addr->sq_port = cb->src_port;
854                 msg->msg_namelen = sizeof(*addr);
855         }
856 
857 out:
858         skb_free_datagram(sk, skb);
859         release_sock(sk);
860 
861         return rc;
862 }
863 
864 static int qrtr_connect(struct socket *sock, struct sockaddr *saddr,
865                         int len, int flags)
866 {
867         DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr);
868         struct qrtr_sock *ipc = qrtr_sk(sock->sk);
869         struct sock *sk = sock->sk;
870         int rc;
871 
872         if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR)
873                 return -EINVAL;
874 
875         lock_sock(sk);
876 
877         sk->sk_state = TCP_CLOSE;
878         sock->state = SS_UNCONNECTED;
879 
880         rc = qrtr_autobind(sock);
881         if (rc) {
882                 release_sock(sk);
883                 return rc;
884         }
885 
886         ipc->peer = *addr;
887         sock->state = SS_CONNECTED;
888         sk->sk_state = TCP_ESTABLISHED;
889 
890         release_sock(sk);
891 
892         return 0;
893 }
894 
895 static int qrtr_getname(struct socket *sock, struct sockaddr *saddr,
896                         int *len, int peer)
897 {
898         struct qrtr_sock *ipc = qrtr_sk(sock->sk);
899         struct sockaddr_qrtr qaddr;
900         struct sock *sk = sock->sk;
901 
902         lock_sock(sk);
903         if (peer) {
904                 if (sk->sk_state != TCP_ESTABLISHED) {
905                         release_sock(sk);
906                         return -ENOTCONN;
907                 }
908 
909                 qaddr = ipc->peer;
910         } else {
911                 qaddr = ipc->us;
912         }
913         release_sock(sk);
914 
915         *len = sizeof(qaddr);
916         qaddr.sq_family = AF_QIPCRTR;
917 
918         memcpy(saddr, &qaddr, sizeof(qaddr));
919 
920         return 0;
921 }
922 
923 static int qrtr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
924 {
925         void __user *argp = (void __user *)arg;
926         struct qrtr_sock *ipc = qrtr_sk(sock->sk);
927         struct sock *sk = sock->sk;
928         struct sockaddr_qrtr *sq;
929         struct sk_buff *skb;
930         struct ifreq ifr;
931         long len = 0;
932         int rc = 0;
933 
934         lock_sock(sk);
935 
936         switch (cmd) {
937         case TIOCOUTQ:
938                 len = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
939                 if (len < 0)
940                         len = 0;
941                 rc = put_user(len, (int __user *)argp);
942                 break;
943         case TIOCINQ:
944                 skb = skb_peek(&sk->sk_receive_queue);
945                 if (skb)
946                         len = skb->len;
947                 rc = put_user(len, (int __user *)argp);
948                 break;
949         case SIOCGIFADDR:
950                 if (copy_from_user(&ifr, argp, sizeof(ifr))) {
951                         rc = -EFAULT;
952                         break;
953                 }
954 
955                 sq = (struct sockaddr_qrtr *)&ifr.ifr_addr;
956                 *sq = ipc->us;
957                 if (copy_to_user(argp, &ifr, sizeof(ifr))) {
958                         rc = -EFAULT;
959                         break;
960                 }
961                 break;
962         case SIOCGSTAMP:
963                 rc = sock_get_timestamp(sk, argp);
964                 break;
965         case SIOCADDRT:
966         case SIOCDELRT:
967         case SIOCSIFADDR:
968         case SIOCGIFDSTADDR:
969         case SIOCSIFDSTADDR:
970         case SIOCGIFBRDADDR:
971         case SIOCSIFBRDADDR:
972         case SIOCGIFNETMASK:
973         case SIOCSIFNETMASK:
974                 rc = -EINVAL;
975                 break;
976         default:
977                 rc = -ENOIOCTLCMD;
978                 break;
979         }
980 
981         release_sock(sk);
982 
983         return rc;
984 }
985 
986 static int qrtr_release(struct socket *sock)
987 {
988         struct sock *sk = sock->sk;
989         struct qrtr_sock *ipc;
990 
991         if (!sk)
992                 return 0;
993 
994         lock_sock(sk);
995 
996         ipc = qrtr_sk(sk);
997         sk->sk_shutdown = SHUTDOWN_MASK;
998         if (!sock_flag(sk, SOCK_DEAD))
999                 sk->sk_state_change(sk);
1000 
1001         sock_set_flag(sk, SOCK_DEAD);
1002         sock->sk = NULL;
1003 
1004         if (!sock_flag(sk, SOCK_ZAPPED))
1005                 qrtr_port_remove(ipc);
1006 
1007         skb_queue_purge(&sk->sk_receive_queue);
1008 
1009         release_sock(sk);
1010         sock_put(sk);
1011 
1012         return 0;
1013 }
1014 
1015 static const struct proto_ops qrtr_proto_ops = {
1016         .owner          = THIS_MODULE,
1017         .family         = AF_QIPCRTR,
1018         .bind           = qrtr_bind,
1019         .connect        = qrtr_connect,
1020         .socketpair     = sock_no_socketpair,
1021         .accept         = sock_no_accept,
1022         .listen         = sock_no_listen,
1023         .sendmsg        = qrtr_sendmsg,
1024         .recvmsg        = qrtr_recvmsg,
1025         .getname        = qrtr_getname,
1026         .ioctl          = qrtr_ioctl,
1027         .poll           = datagram_poll,
1028         .shutdown       = sock_no_shutdown,
1029         .setsockopt     = sock_no_setsockopt,
1030         .getsockopt     = sock_no_getsockopt,
1031         .release        = qrtr_release,
1032         .mmap           = sock_no_mmap,
1033         .sendpage       = sock_no_sendpage,
1034 };
1035 
1036 static struct proto qrtr_proto = {
1037         .name           = "QIPCRTR",
1038         .owner          = THIS_MODULE,
1039         .obj_size       = sizeof(struct qrtr_sock),
1040 };
1041 
1042 static int qrtr_create(struct net *net, struct socket *sock,
1043                        int protocol, int kern)
1044 {
1045         struct qrtr_sock *ipc;
1046         struct sock *sk;
1047 
1048         if (sock->type != SOCK_DGRAM)
1049                 return -EPROTOTYPE;
1050 
1051         sk = sk_alloc(net, AF_QIPCRTR, GFP_KERNEL, &qrtr_proto, kern);
1052         if (!sk)
1053                 return -ENOMEM;
1054 
1055         sock_set_flag(sk, SOCK_ZAPPED);
1056 
1057         sock_init_data(sock, sk);
1058         sock->ops = &qrtr_proto_ops;
1059 
1060         ipc = qrtr_sk(sk);
1061         ipc->us.sq_family = AF_QIPCRTR;
1062         ipc->us.sq_node = qrtr_local_nid;
1063         ipc->us.sq_port = 0;
1064 
1065         return 0;
1066 }
1067 
1068 static const struct nla_policy qrtr_policy[IFA_MAX + 1] = {
1069         [IFA_LOCAL] = { .type = NLA_U32 },
1070 };
1071 
1072 static int qrtr_addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
1073                           struct netlink_ext_ack *extack)
1074 {
1075         struct nlattr *tb[IFA_MAX + 1];
1076         struct ifaddrmsg *ifm;
1077         int rc;
1078 
1079         if (!netlink_capable(skb, CAP_NET_ADMIN))
1080                 return -EPERM;
1081 
1082         if (!netlink_capable(skb, CAP_SYS_ADMIN))
1083                 return -EPERM;
1084 
1085         ASSERT_RTNL();
1086 
1087         rc = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, qrtr_policy, extack);
1088         if (rc < 0)
1089                 return rc;
1090 
1091         ifm = nlmsg_data(nlh);
1092         if (!tb[IFA_LOCAL])
1093                 return -EINVAL;
1094 
1095         qrtr_local_nid = nla_get_u32(tb[IFA_LOCAL]);
1096         return 0;
1097 }
1098 
1099 static const struct net_proto_family qrtr_family = {
1100         .owner  = THIS_MODULE,
1101         .family = AF_QIPCRTR,
1102         .create = qrtr_create,
1103 };
1104 
1105 static int __init qrtr_proto_init(void)
1106 {
1107         int rc;
1108 
1109         rc = proto_register(&qrtr_proto, 1);
1110         if (rc)
1111                 return rc;
1112 
1113         rc = sock_register(&qrtr_family);
1114         if (rc) {
1115                 proto_unregister(&qrtr_proto);
1116                 return rc;
1117         }
1118 
1119         rc = rtnl_register_module(THIS_MODULE, PF_QIPCRTR, RTM_NEWADDR, qrtr_addr_doit, NULL, 0);
1120         if (rc) {
1121                 sock_unregister(qrtr_family.family);
1122                 proto_unregister(&qrtr_proto);
1123         }
1124 
1125         return rc;
1126 }
1127 postcore_initcall(qrtr_proto_init);
1128 
1129 static void __exit qrtr_proto_fini(void)
1130 {
1131         rtnl_unregister(PF_QIPCRTR, RTM_NEWADDR);
1132         sock_unregister(qrtr_family.family);
1133         proto_unregister(&qrtr_proto);
1134 }
1135 module_exit(qrtr_proto_fini);
1136 
1137 MODULE_DESCRIPTION("Qualcomm IPC-router driver");
1138 MODULE_LICENSE("GPL v2");
1139 

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