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97fb5e8d | 1 | // SPDX-License-Identifier: GPL-2.0-only |
bdabad3e CC |
2 | /* |
3 | * Copyright (c) 2015, Sony Mobile Communications Inc. | |
4 | * Copyright (c) 2013, The Linux Foundation. All rights reserved. | |
bdabad3e CC |
5 | */ |
6 | #include <linux/module.h> | |
7 | #include <linux/netlink.h> | |
8 | #include <linux/qrtr.h> | |
9 | #include <linux/termios.h> /* For TIOCINQ/OUTQ */ | |
98fa15f3 | 10 | #include <linux/numa.h> |
0a7e0d0e | 11 | #include <linux/spinlock.h> |
5fdeb0d3 | 12 | #include <linux/wait.h> |
0c2204a4 | 13 | #include <linux/workqueue.h> |
bdabad3e CC |
14 | |
15 | #include <net/sock.h> | |
16 | ||
17 | #include "qrtr.h" | |
18 | ||
194ccc88 BA |
19 | #define QRTR_PROTO_VER_1 1 |
20 | #define QRTR_PROTO_VER_2 3 | |
bdabad3e CC |
21 | |
22 | /* auto-bind range */ | |
23 | #define QRTR_MIN_EPH_SOCKET 0x4000 | |
24 | #define QRTR_MAX_EPH_SOCKET 0x7fff | |
25 | ||
bdabad3e | 26 | /** |
194ccc88 | 27 | * struct qrtr_hdr_v1 - (I|R)PCrouter packet header version 1 |
bdabad3e CC |
28 | * @version: protocol version |
29 | * @type: packet type; one of QRTR_TYPE_* | |
30 | * @src_node_id: source node | |
31 | * @src_port_id: source port | |
32 | * @confirm_rx: boolean; whether a resume-tx packet should be send in reply | |
33 | * @size: length of packet, excluding this header | |
34 | * @dst_node_id: destination node | |
35 | * @dst_port_id: destination port | |
36 | */ | |
194ccc88 | 37 | struct qrtr_hdr_v1 { |
bdabad3e CC |
38 | __le32 version; |
39 | __le32 type; | |
40 | __le32 src_node_id; | |
41 | __le32 src_port_id; | |
42 | __le32 confirm_rx; | |
43 | __le32 size; | |
44 | __le32 dst_node_id; | |
45 | __le32 dst_port_id; | |
46 | } __packed; | |
47 | ||
194ccc88 BA |
48 | /** |
49 | * struct qrtr_hdr_v2 - (I|R)PCrouter packet header later versions | |
50 | * @version: protocol version | |
51 | * @type: packet type; one of QRTR_TYPE_* | |
52 | * @flags: bitmask of QRTR_FLAGS_* | |
53 | * @optlen: length of optional header data | |
54 | * @size: length of packet, excluding this header and optlen | |
55 | * @src_node_id: source node | |
56 | * @src_port_id: source port | |
57 | * @dst_node_id: destination node | |
58 | * @dst_port_id: destination port | |
59 | */ | |
60 | struct qrtr_hdr_v2 { | |
61 | u8 version; | |
62 | u8 type; | |
63 | u8 flags; | |
64 | u8 optlen; | |
65 | __le32 size; | |
66 | __le16 src_node_id; | |
67 | __le16 src_port_id; | |
68 | __le16 dst_node_id; | |
69 | __le16 dst_port_id; | |
70 | }; | |
71 | ||
72 | #define QRTR_FLAGS_CONFIRM_RX BIT(0) | |
73 | ||
f507a9b6 BA |
74 | struct qrtr_cb { |
75 | u32 src_node; | |
76 | u32 src_port; | |
77 | u32 dst_node; | |
78 | u32 dst_port; | |
79 | ||
80 | u8 type; | |
81 | u8 confirm_rx; | |
82 | }; | |
83 | ||
194ccc88 BA |
84 | #define QRTR_HDR_MAX_SIZE max_t(size_t, sizeof(struct qrtr_hdr_v1), \ |
85 | sizeof(struct qrtr_hdr_v2)) | |
bdabad3e CC |
86 | |
87 | struct qrtr_sock { | |
88 | /* WARNING: sk must be the first member */ | |
89 | struct sock sk; | |
90 | struct sockaddr_qrtr us; | |
91 | struct sockaddr_qrtr peer; | |
92 | }; | |
93 | ||
94 | static inline struct qrtr_sock *qrtr_sk(struct sock *sk) | |
95 | { | |
96 | BUILD_BUG_ON(offsetof(struct qrtr_sock, sk) != 0); | |
97 | return container_of(sk, struct qrtr_sock, sk); | |
98 | } | |
99 | ||
98fa15f3 | 100 | static unsigned int qrtr_local_nid = NUMA_NO_NODE; |
bdabad3e CC |
101 | |
102 | /* for node ids */ | |
0a7e0d0e BA |
103 | static RADIX_TREE(qrtr_nodes, GFP_ATOMIC); |
104 | static DEFINE_SPINLOCK(qrtr_nodes_lock); | |
bdabad3e CC |
105 | /* broadcast list */ |
106 | static LIST_HEAD(qrtr_all_nodes); | |
0a7e0d0e | 107 | /* lock for qrtr_all_nodes and node reference */ |
bdabad3e CC |
108 | static DEFINE_MUTEX(qrtr_node_lock); |
109 | ||
110 | /* local port allocation management */ | |
111 | static DEFINE_IDR(qrtr_ports); | |
112 | static DEFINE_MUTEX(qrtr_port_lock); | |
113 | ||
0c2204a4 MS |
114 | static struct delayed_work qrtr_ns_work; |
115 | ||
bdabad3e CC |
116 | /** |
117 | * struct qrtr_node - endpoint node | |
118 | * @ep_lock: lock for endpoint management and callbacks | |
119 | * @ep: endpoint | |
120 | * @ref: reference count for node | |
121 | * @nid: node id | |
5fdeb0d3 BA |
122 | * @qrtr_tx_flow: tree of qrtr_tx_flow, keyed by node << 32 | port |
123 | * @qrtr_tx_lock: lock for qrtr_tx_flow inserts | |
bdabad3e | 124 | * @rx_queue: receive queue |
bdabad3e CC |
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 | ||
5fdeb0d3 BA |
133 | struct radix_tree_root qrtr_tx_flow; |
134 | struct mutex qrtr_tx_lock; /* for qrtr_tx_flow */ | |
135 | ||
bdabad3e | 136 | struct sk_buff_head rx_queue; |
bdabad3e CC |
137 | struct list_head item; |
138 | }; | |
139 | ||
5fdeb0d3 BA |
140 | /** |
141 | * struct qrtr_tx_flow - tx flow control | |
142 | * @resume_tx: waiters for a resume tx from the remote | |
143 | * @pending: number of waiting senders | |
144 | * @tx_failed: indicates that a message with confirm_rx flag was lost | |
145 | */ | |
146 | struct qrtr_tx_flow { | |
147 | struct wait_queue_head resume_tx; | |
148 | int pending; | |
149 | int tx_failed; | |
150 | }; | |
151 | ||
152 | #define QRTR_TX_FLOW_HIGH 10 | |
153 | #define QRTR_TX_FLOW_LOW 5 | |
154 | ||
e7044482 BA |
155 | static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb, |
156 | int type, struct sockaddr_qrtr *from, | |
157 | struct sockaddr_qrtr *to); | |
158 | static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb, | |
159 | int type, struct sockaddr_qrtr *from, | |
160 | struct sockaddr_qrtr *to); | |
e04df98a BA |
161 | static struct qrtr_sock *qrtr_port_lookup(int port); |
162 | static void qrtr_port_put(struct qrtr_sock *ipc); | |
8acc8ee4 | 163 | |
bdabad3e CC |
164 | /* Release node resources and free the node. |
165 | * | |
166 | * Do not call directly, use qrtr_node_release. To be used with | |
167 | * kref_put_mutex. As such, the node mutex is expected to be locked on call. | |
168 | */ | |
169 | static void __qrtr_node_release(struct kref *kref) | |
170 | { | |
171 | struct qrtr_node *node = container_of(kref, struct qrtr_node, ref); | |
5fdeb0d3 | 172 | struct radix_tree_iter iter; |
0a7e0d0e | 173 | unsigned long flags; |
5fdeb0d3 | 174 | void __rcu **slot; |
bdabad3e | 175 | |
0a7e0d0e | 176 | spin_lock_irqsave(&qrtr_nodes_lock, flags); |
bdabad3e CC |
177 | if (node->nid != QRTR_EP_NID_AUTO) |
178 | radix_tree_delete(&qrtr_nodes, node->nid); | |
0a7e0d0e | 179 | spin_unlock_irqrestore(&qrtr_nodes_lock, flags); |
bdabad3e CC |
180 | |
181 | list_del(&node->item); | |
182 | mutex_unlock(&qrtr_node_lock); | |
183 | ||
184 | skb_queue_purge(&node->rx_queue); | |
5fdeb0d3 BA |
185 | |
186 | /* Free tx flow counters */ | |
187 | radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) { | |
188 | radix_tree_iter_delete(&node->qrtr_tx_flow, &iter, slot); | |
189 | kfree(*slot); | |
190 | } | |
bdabad3e CC |
191 | kfree(node); |
192 | } | |
193 | ||
194 | /* Increment reference to node. */ | |
195 | static struct qrtr_node *qrtr_node_acquire(struct qrtr_node *node) | |
196 | { | |
197 | if (node) | |
198 | kref_get(&node->ref); | |
199 | return node; | |
200 | } | |
201 | ||
202 | /* Decrement reference to node and release as necessary. */ | |
203 | static void qrtr_node_release(struct qrtr_node *node) | |
204 | { | |
205 | if (!node) | |
206 | return; | |
207 | kref_put_mutex(&node->ref, __qrtr_node_release, &qrtr_node_lock); | |
208 | } | |
209 | ||
5fdeb0d3 BA |
210 | /** |
211 | * qrtr_tx_resume() - reset flow control counter | |
212 | * @node: qrtr_node that the QRTR_TYPE_RESUME_TX packet arrived on | |
213 | * @skb: resume_tx packet | |
214 | */ | |
215 | static void qrtr_tx_resume(struct qrtr_node *node, struct sk_buff *skb) | |
216 | { | |
217 | struct qrtr_ctrl_pkt *pkt = (struct qrtr_ctrl_pkt *)skb->data; | |
218 | u64 remote_node = le32_to_cpu(pkt->client.node); | |
219 | u32 remote_port = le32_to_cpu(pkt->client.port); | |
220 | struct qrtr_tx_flow *flow; | |
221 | unsigned long key; | |
222 | ||
223 | key = remote_node << 32 | remote_port; | |
224 | ||
225 | rcu_read_lock(); | |
226 | flow = radix_tree_lookup(&node->qrtr_tx_flow, key); | |
227 | rcu_read_unlock(); | |
228 | if (flow) { | |
229 | spin_lock(&flow->resume_tx.lock); | |
230 | flow->pending = 0; | |
231 | spin_unlock(&flow->resume_tx.lock); | |
232 | wake_up_interruptible_all(&flow->resume_tx); | |
233 | } | |
234 | ||
235 | consume_skb(skb); | |
236 | } | |
237 | ||
238 | /** | |
239 | * qrtr_tx_wait() - flow control for outgoing packets | |
240 | * @node: qrtr_node that the packet is to be send to | |
241 | * @dest_node: node id of the destination | |
242 | * @dest_port: port number of the destination | |
243 | * @type: type of message | |
244 | * | |
245 | * The flow control scheme is based around the low and high "watermarks". When | |
246 | * the low watermark is passed the confirm_rx flag is set on the outgoing | |
247 | * message, which will trigger the remote to send a control message of the type | |
248 | * QRTR_TYPE_RESUME_TX to reset the counter. If the high watermark is hit | |
249 | * further transmision should be paused. | |
250 | * | |
251 | * Return: 1 if confirm_rx should be set, 0 otherwise or errno failure | |
252 | */ | |
253 | static int qrtr_tx_wait(struct qrtr_node *node, int dest_node, int dest_port, | |
254 | int type) | |
255 | { | |
256 | unsigned long key = (u64)dest_node << 32 | dest_port; | |
257 | struct qrtr_tx_flow *flow; | |
258 | int confirm_rx = 0; | |
259 | int ret; | |
260 | ||
261 | /* Never set confirm_rx on non-data packets */ | |
262 | if (type != QRTR_TYPE_DATA) | |
263 | return 0; | |
264 | ||
265 | mutex_lock(&node->qrtr_tx_lock); | |
266 | flow = radix_tree_lookup(&node->qrtr_tx_flow, key); | |
267 | if (!flow) { | |
268 | flow = kzalloc(sizeof(*flow), GFP_KERNEL); | |
269 | if (flow) { | |
270 | init_waitqueue_head(&flow->resume_tx); | |
271 | radix_tree_insert(&node->qrtr_tx_flow, key, flow); | |
272 | } | |
273 | } | |
274 | mutex_unlock(&node->qrtr_tx_lock); | |
275 | ||
276 | /* Set confirm_rx if we where unable to find and allocate a flow */ | |
277 | if (!flow) | |
278 | return 1; | |
279 | ||
280 | spin_lock_irq(&flow->resume_tx.lock); | |
281 | ret = wait_event_interruptible_locked_irq(flow->resume_tx, | |
282 | flow->pending < QRTR_TX_FLOW_HIGH || | |
283 | flow->tx_failed || | |
284 | !node->ep); | |
285 | if (ret < 0) { | |
286 | confirm_rx = ret; | |
287 | } else if (!node->ep) { | |
288 | confirm_rx = -EPIPE; | |
289 | } else if (flow->tx_failed) { | |
290 | flow->tx_failed = 0; | |
291 | confirm_rx = 1; | |
292 | } else { | |
293 | flow->pending++; | |
294 | confirm_rx = flow->pending == QRTR_TX_FLOW_LOW; | |
295 | } | |
296 | spin_unlock_irq(&flow->resume_tx.lock); | |
297 | ||
298 | return confirm_rx; | |
299 | } | |
300 | ||
301 | /** | |
302 | * qrtr_tx_flow_failed() - flag that tx of confirm_rx flagged messages failed | |
303 | * @node: qrtr_node that the packet is to be send to | |
304 | * @dest_node: node id of the destination | |
305 | * @dest_port: port number of the destination | |
306 | * | |
307 | * Signal that the transmission of a message with confirm_rx flag failed. The | |
308 | * flow's "pending" counter will keep incrementing towards QRTR_TX_FLOW_HIGH, | |
309 | * at which point transmission would stall forever waiting for the resume TX | |
310 | * message associated with the dropped confirm_rx message. | |
311 | * Work around this by marking the flow as having a failed transmission and | |
312 | * cause the next transmission attempt to be sent with the confirm_rx. | |
313 | */ | |
314 | static void qrtr_tx_flow_failed(struct qrtr_node *node, int dest_node, | |
315 | int dest_port) | |
316 | { | |
317 | unsigned long key = (u64)dest_node << 32 | dest_port; | |
318 | struct qrtr_tx_flow *flow; | |
319 | ||
320 | rcu_read_lock(); | |
321 | flow = radix_tree_lookup(&node->qrtr_tx_flow, key); | |
322 | rcu_read_unlock(); | |
323 | if (flow) { | |
324 | spin_lock_irq(&flow->resume_tx.lock); | |
325 | flow->tx_failed = 1; | |
326 | spin_unlock_irq(&flow->resume_tx.lock); | |
327 | } | |
328 | } | |
329 | ||
bdabad3e | 330 | /* Pass an outgoing packet socket buffer to the endpoint driver. */ |
e7044482 BA |
331 | static int qrtr_node_enqueue(struct qrtr_node *node, struct sk_buff *skb, |
332 | int type, struct sockaddr_qrtr *from, | |
333 | struct sockaddr_qrtr *to) | |
bdabad3e | 334 | { |
194ccc88 | 335 | struct qrtr_hdr_v1 *hdr; |
e7044482 | 336 | size_t len = skb->len; |
bdabad3e | 337 | int rc = -ENODEV; |
5fdeb0d3 BA |
338 | int confirm_rx; |
339 | ||
340 | confirm_rx = qrtr_tx_wait(node, to->sq_node, to->sq_port, type); | |
341 | if (confirm_rx < 0) { | |
342 | kfree_skb(skb); | |
343 | return confirm_rx; | |
344 | } | |
bdabad3e | 345 | |
194ccc88 BA |
346 | hdr = skb_push(skb, sizeof(*hdr)); |
347 | hdr->version = cpu_to_le32(QRTR_PROTO_VER_1); | |
e7044482 BA |
348 | hdr->type = cpu_to_le32(type); |
349 | hdr->src_node_id = cpu_to_le32(from->sq_node); | |
350 | hdr->src_port_id = cpu_to_le32(from->sq_port); | |
d27e77a3 AKN |
351 | if (to->sq_port == QRTR_PORT_CTRL) { |
352 | hdr->dst_node_id = cpu_to_le32(node->nid); | |
353 | hdr->dst_port_id = cpu_to_le32(QRTR_NODE_BCAST); | |
354 | } else { | |
355 | hdr->dst_node_id = cpu_to_le32(to->sq_node); | |
356 | hdr->dst_port_id = cpu_to_le32(to->sq_port); | |
357 | } | |
e7044482 BA |
358 | |
359 | hdr->size = cpu_to_le32(len); | |
5fdeb0d3 | 360 | hdr->confirm_rx = !!confirm_rx; |
e7044482 | 361 | |
ce57785b | 362 | skb_put_padto(skb, ALIGN(len, 4) + sizeof(*hdr)); |
e7044482 | 363 | |
bdabad3e CC |
364 | mutex_lock(&node->ep_lock); |
365 | if (node->ep) | |
366 | rc = node->ep->xmit(node->ep, skb); | |
367 | else | |
368 | kfree_skb(skb); | |
369 | mutex_unlock(&node->ep_lock); | |
370 | ||
5fdeb0d3 BA |
371 | /* Need to ensure that a subsequent message carries the otherwise lost |
372 | * confirm_rx flag if we dropped this one */ | |
373 | if (rc && confirm_rx) | |
374 | qrtr_tx_flow_failed(node, to->sq_node, to->sq_port); | |
375 | ||
bdabad3e CC |
376 | return rc; |
377 | } | |
378 | ||
379 | /* Lookup node by id. | |
380 | * | |
381 | * callers must release with qrtr_node_release() | |
382 | */ | |
383 | static struct qrtr_node *qrtr_node_lookup(unsigned int nid) | |
384 | { | |
385 | struct qrtr_node *node; | |
0a7e0d0e | 386 | unsigned long flags; |
bdabad3e | 387 | |
0a7e0d0e | 388 | spin_lock_irqsave(&qrtr_nodes_lock, flags); |
bdabad3e CC |
389 | node = radix_tree_lookup(&qrtr_nodes, nid); |
390 | node = qrtr_node_acquire(node); | |
0a7e0d0e | 391 | spin_unlock_irqrestore(&qrtr_nodes_lock, flags); |
bdabad3e CC |
392 | |
393 | return node; | |
394 | } | |
395 | ||
396 | /* Assign node id to node. | |
397 | * | |
398 | * This is mostly useful for automatic node id assignment, based on | |
399 | * the source id in the incoming packet. | |
400 | */ | |
401 | static void qrtr_node_assign(struct qrtr_node *node, unsigned int nid) | |
402 | { | |
0a7e0d0e BA |
403 | unsigned long flags; |
404 | ||
bdabad3e CC |
405 | if (node->nid != QRTR_EP_NID_AUTO || nid == QRTR_EP_NID_AUTO) |
406 | return; | |
407 | ||
0a7e0d0e | 408 | spin_lock_irqsave(&qrtr_nodes_lock, flags); |
bdabad3e CC |
409 | radix_tree_insert(&qrtr_nodes, nid, node); |
410 | node->nid = nid; | |
0a7e0d0e | 411 | spin_unlock_irqrestore(&qrtr_nodes_lock, flags); |
bdabad3e CC |
412 | } |
413 | ||
414 | /** | |
415 | * qrtr_endpoint_post() - post incoming data | |
416 | * @ep: endpoint handle | |
417 | * @data: data pointer | |
418 | * @len: size of data in bytes | |
419 | * | |
420 | * Return: 0 on success; negative error code on failure | |
421 | */ | |
422 | int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len) | |
423 | { | |
424 | struct qrtr_node *node = ep->node; | |
194ccc88 BA |
425 | const struct qrtr_hdr_v1 *v1; |
426 | const struct qrtr_hdr_v2 *v2; | |
e04df98a | 427 | struct qrtr_sock *ipc; |
bdabad3e | 428 | struct sk_buff *skb; |
f507a9b6 | 429 | struct qrtr_cb *cb; |
bdabad3e | 430 | unsigned int size; |
bdabad3e | 431 | unsigned int ver; |
194ccc88 | 432 | size_t hdrlen; |
bdabad3e | 433 | |
194ccc88 | 434 | if (len & 3) |
bdabad3e CC |
435 | return -EINVAL; |
436 | ||
437 | skb = netdev_alloc_skb(NULL, len); | |
438 | if (!skb) | |
439 | return -ENOMEM; | |
440 | ||
f507a9b6 | 441 | cb = (struct qrtr_cb *)skb->cb; |
f507a9b6 | 442 | |
194ccc88 BA |
443 | /* Version field in v1 is little endian, so this works for both cases */ |
444 | ver = *(u8*)data; | |
445 | ||
446 | switch (ver) { | |
447 | case QRTR_PROTO_VER_1: | |
448 | v1 = data; | |
449 | hdrlen = sizeof(*v1); | |
450 | ||
451 | cb->type = le32_to_cpu(v1->type); | |
452 | cb->src_node = le32_to_cpu(v1->src_node_id); | |
453 | cb->src_port = le32_to_cpu(v1->src_port_id); | |
454 | cb->confirm_rx = !!v1->confirm_rx; | |
455 | cb->dst_node = le32_to_cpu(v1->dst_node_id); | |
456 | cb->dst_port = le32_to_cpu(v1->dst_port_id); | |
457 | ||
458 | size = le32_to_cpu(v1->size); | |
459 | break; | |
460 | case QRTR_PROTO_VER_2: | |
461 | v2 = data; | |
462 | hdrlen = sizeof(*v2) + v2->optlen; | |
463 | ||
464 | cb->type = v2->type; | |
465 | cb->confirm_rx = !!(v2->flags & QRTR_FLAGS_CONFIRM_RX); | |
466 | cb->src_node = le16_to_cpu(v2->src_node_id); | |
467 | cb->src_port = le16_to_cpu(v2->src_port_id); | |
468 | cb->dst_node = le16_to_cpu(v2->dst_node_id); | |
469 | cb->dst_port = le16_to_cpu(v2->dst_port_id); | |
470 | ||
471 | if (cb->src_port == (u16)QRTR_PORT_CTRL) | |
472 | cb->src_port = QRTR_PORT_CTRL; | |
473 | if (cb->dst_port == (u16)QRTR_PORT_CTRL) | |
474 | cb->dst_port = QRTR_PORT_CTRL; | |
475 | ||
476 | size = le32_to_cpu(v2->size); | |
477 | break; | |
478 | default: | |
479 | pr_err("qrtr: Invalid version %d\n", ver); | |
480 | goto err; | |
481 | } | |
482 | ||
483 | if (len != ALIGN(size, 4) + hdrlen) | |
484 | goto err; | |
485 | ||
5fdeb0d3 BA |
486 | if (cb->dst_port != QRTR_PORT_CTRL && cb->type != QRTR_TYPE_DATA && |
487 | cb->type != QRTR_TYPE_RESUME_TX) | |
194ccc88 BA |
488 | goto err; |
489 | ||
490 | skb_put_data(skb, data + hdrlen, size); | |
bdabad3e | 491 | |
e04df98a BA |
492 | qrtr_node_assign(node, cb->src_node); |
493 | ||
494 | if (cb->type == QRTR_TYPE_RESUME_TX) { | |
495 | qrtr_tx_resume(node, skb); | |
496 | } else { | |
497 | ipc = qrtr_port_lookup(cb->dst_port); | |
498 | if (!ipc) | |
499 | goto err; | |
500 | ||
501 | if (sock_queue_rcv_skb(&ipc->sk, skb)) | |
502 | goto err; | |
503 | ||
504 | qrtr_port_put(ipc); | |
505 | } | |
bdabad3e CC |
506 | |
507 | return 0; | |
194ccc88 BA |
508 | |
509 | err: | |
510 | kfree_skb(skb); | |
511 | return -EINVAL; | |
512 | ||
bdabad3e CC |
513 | } |
514 | EXPORT_SYMBOL_GPL(qrtr_endpoint_post); | |
515 | ||
1a7959c7 BA |
516 | /** |
517 | * qrtr_alloc_ctrl_packet() - allocate control packet skb | |
518 | * @pkt: reference to qrtr_ctrl_pkt pointer | |
519 | * | |
520 | * Returns newly allocated sk_buff, or NULL on failure | |
521 | * | |
522 | * This function allocates a sk_buff large enough to carry a qrtr_ctrl_pkt and | |
523 | * on success returns a reference to the control packet in @pkt. | |
524 | */ | |
525 | static struct sk_buff *qrtr_alloc_ctrl_packet(struct qrtr_ctrl_pkt **pkt) | |
bdabad3e | 526 | { |
1a7959c7 | 527 | const int pkt_len = sizeof(struct qrtr_ctrl_pkt); |
bdabad3e | 528 | struct sk_buff *skb; |
bdabad3e | 529 | |
194ccc88 | 530 | skb = alloc_skb(QRTR_HDR_MAX_SIZE + pkt_len, GFP_KERNEL); |
bdabad3e CC |
531 | if (!skb) |
532 | return NULL; | |
bdabad3e | 533 | |
194ccc88 | 534 | skb_reserve(skb, QRTR_HDR_MAX_SIZE); |
1a7959c7 | 535 | *pkt = skb_put_zero(skb, pkt_len); |
1784473b BA |
536 | |
537 | return skb; | |
538 | } | |
539 | ||
bdabad3e CC |
540 | /** |
541 | * qrtr_endpoint_register() - register a new endpoint | |
542 | * @ep: endpoint to register | |
543 | * @nid: desired node id; may be QRTR_EP_NID_AUTO for auto-assignment | |
544 | * Return: 0 on success; negative error code on failure | |
545 | * | |
546 | * The specified endpoint must have the xmit function pointer set on call. | |
547 | */ | |
548 | int qrtr_endpoint_register(struct qrtr_endpoint *ep, unsigned int nid) | |
549 | { | |
550 | struct qrtr_node *node; | |
551 | ||
552 | if (!ep || !ep->xmit) | |
553 | return -EINVAL; | |
554 | ||
555 | node = kzalloc(sizeof(*node), GFP_KERNEL); | |
556 | if (!node) | |
557 | return -ENOMEM; | |
558 | ||
bdabad3e CC |
559 | kref_init(&node->ref); |
560 | mutex_init(&node->ep_lock); | |
561 | skb_queue_head_init(&node->rx_queue); | |
562 | node->nid = QRTR_EP_NID_AUTO; | |
563 | node->ep = ep; | |
564 | ||
5fdeb0d3 BA |
565 | INIT_RADIX_TREE(&node->qrtr_tx_flow, GFP_KERNEL); |
566 | mutex_init(&node->qrtr_tx_lock); | |
567 | ||
bdabad3e CC |
568 | qrtr_node_assign(node, nid); |
569 | ||
570 | mutex_lock(&qrtr_node_lock); | |
571 | list_add(&node->item, &qrtr_all_nodes); | |
572 | mutex_unlock(&qrtr_node_lock); | |
573 | ep->node = node; | |
574 | ||
575 | return 0; | |
576 | } | |
577 | EXPORT_SYMBOL_GPL(qrtr_endpoint_register); | |
578 | ||
579 | /** | |
580 | * qrtr_endpoint_unregister - unregister endpoint | |
581 | * @ep: endpoint to unregister | |
582 | */ | |
583 | void qrtr_endpoint_unregister(struct qrtr_endpoint *ep) | |
584 | { | |
585 | struct qrtr_node *node = ep->node; | |
e7044482 BA |
586 | struct sockaddr_qrtr src = {AF_QIPCRTR, node->nid, QRTR_PORT_CTRL}; |
587 | struct sockaddr_qrtr dst = {AF_QIPCRTR, qrtr_local_nid, QRTR_PORT_CTRL}; | |
5fdeb0d3 | 588 | struct radix_tree_iter iter; |
1a7959c7 | 589 | struct qrtr_ctrl_pkt *pkt; |
5fdeb0d3 | 590 | struct qrtr_tx_flow *flow; |
8acc8ee4 | 591 | struct sk_buff *skb; |
5fdeb0d3 | 592 | void __rcu **slot; |
bdabad3e CC |
593 | |
594 | mutex_lock(&node->ep_lock); | |
595 | node->ep = NULL; | |
596 | mutex_unlock(&node->ep_lock); | |
597 | ||
8acc8ee4 | 598 | /* Notify the local controller about the event */ |
1a7959c7 BA |
599 | skb = qrtr_alloc_ctrl_packet(&pkt); |
600 | if (skb) { | |
601 | pkt->cmd = cpu_to_le32(QRTR_TYPE_BYE); | |
e7044482 | 602 | qrtr_local_enqueue(NULL, skb, QRTR_TYPE_BYE, &src, &dst); |
1a7959c7 | 603 | } |
8acc8ee4 | 604 | |
5fdeb0d3 BA |
605 | /* Wake up any transmitters waiting for resume-tx from the node */ |
606 | mutex_lock(&node->qrtr_tx_lock); | |
607 | radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) { | |
608 | flow = *slot; | |
609 | wake_up_interruptible_all(&flow->resume_tx); | |
610 | } | |
611 | mutex_unlock(&node->qrtr_tx_lock); | |
612 | ||
bdabad3e CC |
613 | qrtr_node_release(node); |
614 | ep->node = NULL; | |
615 | } | |
616 | EXPORT_SYMBOL_GPL(qrtr_endpoint_unregister); | |
617 | ||
618 | /* Lookup socket by port. | |
619 | * | |
620 | * Callers must release with qrtr_port_put() | |
621 | */ | |
622 | static struct qrtr_sock *qrtr_port_lookup(int port) | |
623 | { | |
624 | struct qrtr_sock *ipc; | |
625 | ||
626 | if (port == QRTR_PORT_CTRL) | |
627 | port = 0; | |
628 | ||
f16a4b26 | 629 | rcu_read_lock(); |
bdabad3e CC |
630 | ipc = idr_find(&qrtr_ports, port); |
631 | if (ipc) | |
632 | sock_hold(&ipc->sk); | |
f16a4b26 | 633 | rcu_read_unlock(); |
bdabad3e CC |
634 | |
635 | return ipc; | |
636 | } | |
637 | ||
638 | /* Release acquired socket. */ | |
639 | static void qrtr_port_put(struct qrtr_sock *ipc) | |
640 | { | |
641 | sock_put(&ipc->sk); | |
642 | } | |
643 | ||
644 | /* Remove port assignment. */ | |
645 | static void qrtr_port_remove(struct qrtr_sock *ipc) | |
646 | { | |
1a7959c7 | 647 | struct qrtr_ctrl_pkt *pkt; |
1784473b | 648 | struct sk_buff *skb; |
bdabad3e | 649 | int port = ipc->us.sq_port; |
e7044482 BA |
650 | struct sockaddr_qrtr to; |
651 | ||
652 | to.sq_family = AF_QIPCRTR; | |
653 | to.sq_node = QRTR_NODE_BCAST; | |
654 | to.sq_port = QRTR_PORT_CTRL; | |
bdabad3e | 655 | |
1a7959c7 | 656 | skb = qrtr_alloc_ctrl_packet(&pkt); |
1784473b | 657 | if (skb) { |
1a7959c7 BA |
658 | pkt->cmd = cpu_to_le32(QRTR_TYPE_DEL_CLIENT); |
659 | pkt->client.node = cpu_to_le32(ipc->us.sq_node); | |
660 | pkt->client.port = cpu_to_le32(ipc->us.sq_port); | |
661 | ||
1784473b | 662 | skb_set_owner_w(skb, &ipc->sk); |
e7044482 BA |
663 | qrtr_bcast_enqueue(NULL, skb, QRTR_TYPE_DEL_CLIENT, &ipc->us, |
664 | &to); | |
1784473b BA |
665 | } |
666 | ||
bdabad3e CC |
667 | if (port == QRTR_PORT_CTRL) |
668 | port = 0; | |
669 | ||
670 | __sock_put(&ipc->sk); | |
671 | ||
672 | mutex_lock(&qrtr_port_lock); | |
673 | idr_remove(&qrtr_ports, port); | |
674 | mutex_unlock(&qrtr_port_lock); | |
f16a4b26 BA |
675 | |
676 | /* Ensure that if qrtr_port_lookup() did enter the RCU read section we | |
677 | * wait for it to up increment the refcount */ | |
678 | synchronize_rcu(); | |
bdabad3e CC |
679 | } |
680 | ||
681 | /* Assign port number to socket. | |
682 | * | |
683 | * Specify port in the integer pointed to by port, and it will be adjusted | |
684 | * on return as necesssary. | |
685 | * | |
686 | * Port may be: | |
687 | * 0: Assign ephemeral port in [QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET] | |
688 | * <QRTR_MIN_EPH_SOCKET: Specified; requires CAP_NET_ADMIN | |
689 | * >QRTR_MIN_EPH_SOCKET: Specified; available to all | |
690 | */ | |
691 | static int qrtr_port_assign(struct qrtr_sock *ipc, int *port) | |
692 | { | |
693 | int rc; | |
694 | ||
695 | mutex_lock(&qrtr_port_lock); | |
696 | if (!*port) { | |
697 | rc = idr_alloc(&qrtr_ports, ipc, | |
698 | QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET + 1, | |
699 | GFP_ATOMIC); | |
700 | if (rc >= 0) | |
701 | *port = rc; | |
702 | } else if (*port < QRTR_MIN_EPH_SOCKET && !capable(CAP_NET_ADMIN)) { | |
703 | rc = -EACCES; | |
704 | } else if (*port == QRTR_PORT_CTRL) { | |
705 | rc = idr_alloc(&qrtr_ports, ipc, 0, 1, GFP_ATOMIC); | |
706 | } else { | |
707 | rc = idr_alloc(&qrtr_ports, ipc, *port, *port + 1, GFP_ATOMIC); | |
708 | if (rc >= 0) | |
709 | *port = rc; | |
710 | } | |
711 | mutex_unlock(&qrtr_port_lock); | |
712 | ||
713 | if (rc == -ENOSPC) | |
714 | return -EADDRINUSE; | |
715 | else if (rc < 0) | |
716 | return rc; | |
717 | ||
718 | sock_hold(&ipc->sk); | |
719 | ||
720 | return 0; | |
721 | } | |
722 | ||
b24844b1 BA |
723 | /* Reset all non-control ports */ |
724 | static void qrtr_reset_ports(void) | |
725 | { | |
726 | struct qrtr_sock *ipc; | |
727 | int id; | |
728 | ||
729 | mutex_lock(&qrtr_port_lock); | |
730 | idr_for_each_entry(&qrtr_ports, ipc, id) { | |
731 | /* Don't reset control port */ | |
732 | if (id == 0) | |
733 | continue; | |
734 | ||
735 | sock_hold(&ipc->sk); | |
736 | ipc->sk.sk_err = ENETRESET; | |
ae85bfa8 | 737 | ipc->sk.sk_error_report(&ipc->sk); |
b24844b1 BA |
738 | sock_put(&ipc->sk); |
739 | } | |
740 | mutex_unlock(&qrtr_port_lock); | |
741 | } | |
742 | ||
bdabad3e CC |
743 | /* Bind socket to address. |
744 | * | |
745 | * Socket should be locked upon call. | |
746 | */ | |
747 | static int __qrtr_bind(struct socket *sock, | |
748 | const struct sockaddr_qrtr *addr, int zapped) | |
749 | { | |
750 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
751 | struct sock *sk = sock->sk; | |
752 | int port; | |
753 | int rc; | |
754 | ||
755 | /* rebinding ok */ | |
756 | if (!zapped && addr->sq_port == ipc->us.sq_port) | |
757 | return 0; | |
758 | ||
759 | port = addr->sq_port; | |
760 | rc = qrtr_port_assign(ipc, &port); | |
761 | if (rc) | |
762 | return rc; | |
763 | ||
764 | /* unbind previous, if any */ | |
765 | if (!zapped) | |
766 | qrtr_port_remove(ipc); | |
767 | ipc->us.sq_port = port; | |
768 | ||
769 | sock_reset_flag(sk, SOCK_ZAPPED); | |
770 | ||
b24844b1 BA |
771 | /* Notify all open ports about the new controller */ |
772 | if (port == QRTR_PORT_CTRL) | |
773 | qrtr_reset_ports(); | |
774 | ||
bdabad3e CC |
775 | return 0; |
776 | } | |
777 | ||
778 | /* Auto bind to an ephemeral port. */ | |
779 | static int qrtr_autobind(struct socket *sock) | |
780 | { | |
781 | struct sock *sk = sock->sk; | |
782 | struct sockaddr_qrtr addr; | |
783 | ||
784 | if (!sock_flag(sk, SOCK_ZAPPED)) | |
785 | return 0; | |
786 | ||
787 | addr.sq_family = AF_QIPCRTR; | |
788 | addr.sq_node = qrtr_local_nid; | |
789 | addr.sq_port = 0; | |
790 | ||
791 | return __qrtr_bind(sock, &addr, 1); | |
792 | } | |
793 | ||
794 | /* Bind socket to specified sockaddr. */ | |
795 | static int qrtr_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
796 | { | |
797 | DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr); | |
798 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
799 | struct sock *sk = sock->sk; | |
800 | int rc; | |
801 | ||
802 | if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR) | |
803 | return -EINVAL; | |
804 | ||
805 | if (addr->sq_node != ipc->us.sq_node) | |
806 | return -EINVAL; | |
807 | ||
808 | lock_sock(sk); | |
809 | rc = __qrtr_bind(sock, addr, sock_flag(sk, SOCK_ZAPPED)); | |
810 | release_sock(sk); | |
811 | ||
812 | return rc; | |
813 | } | |
814 | ||
815 | /* Queue packet to local peer socket. */ | |
e7044482 BA |
816 | static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb, |
817 | int type, struct sockaddr_qrtr *from, | |
818 | struct sockaddr_qrtr *to) | |
bdabad3e | 819 | { |
bdabad3e | 820 | struct qrtr_sock *ipc; |
f507a9b6 | 821 | struct qrtr_cb *cb; |
bdabad3e | 822 | |
e7044482 | 823 | ipc = qrtr_port_lookup(to->sq_port); |
bdabad3e CC |
824 | if (!ipc || &ipc->sk == skb->sk) { /* do not send to self */ |
825 | kfree_skb(skb); | |
826 | return -ENODEV; | |
827 | } | |
828 | ||
f507a9b6 BA |
829 | cb = (struct qrtr_cb *)skb->cb; |
830 | cb->src_node = from->sq_node; | |
831 | cb->src_port = from->sq_port; | |
e7044482 | 832 | |
bdabad3e CC |
833 | if (sock_queue_rcv_skb(&ipc->sk, skb)) { |
834 | qrtr_port_put(ipc); | |
835 | kfree_skb(skb); | |
836 | return -ENOSPC; | |
837 | } | |
838 | ||
839 | qrtr_port_put(ipc); | |
840 | ||
841 | return 0; | |
842 | } | |
843 | ||
844 | /* Queue packet for broadcast. */ | |
e7044482 BA |
845 | static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb, |
846 | int type, struct sockaddr_qrtr *from, | |
847 | struct sockaddr_qrtr *to) | |
bdabad3e CC |
848 | { |
849 | struct sk_buff *skbn; | |
850 | ||
851 | mutex_lock(&qrtr_node_lock); | |
852 | list_for_each_entry(node, &qrtr_all_nodes, item) { | |
853 | skbn = skb_clone(skb, GFP_KERNEL); | |
854 | if (!skbn) | |
855 | break; | |
856 | skb_set_owner_w(skbn, skb->sk); | |
e7044482 | 857 | qrtr_node_enqueue(node, skbn, type, from, to); |
bdabad3e CC |
858 | } |
859 | mutex_unlock(&qrtr_node_lock); | |
860 | ||
e7044482 | 861 | qrtr_local_enqueue(node, skb, type, from, to); |
bdabad3e CC |
862 | |
863 | return 0; | |
864 | } | |
865 | ||
866 | static int qrtr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) | |
867 | { | |
868 | DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name); | |
e7044482 BA |
869 | int (*enqueue_fn)(struct qrtr_node *, struct sk_buff *, int, |
870 | struct sockaddr_qrtr *, struct sockaddr_qrtr *); | |
8f5e2451 | 871 | __le32 qrtr_type = cpu_to_le32(QRTR_TYPE_DATA); |
bdabad3e CC |
872 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); |
873 | struct sock *sk = sock->sk; | |
874 | struct qrtr_node *node; | |
bdabad3e CC |
875 | struct sk_buff *skb; |
876 | size_t plen; | |
7036e621 | 877 | u32 type; |
bdabad3e CC |
878 | int rc; |
879 | ||
880 | if (msg->msg_flags & ~(MSG_DONTWAIT)) | |
881 | return -EINVAL; | |
882 | ||
883 | if (len > 65535) | |
884 | return -EMSGSIZE; | |
885 | ||
886 | lock_sock(sk); | |
887 | ||
888 | if (addr) { | |
889 | if (msg->msg_namelen < sizeof(*addr)) { | |
890 | release_sock(sk); | |
891 | return -EINVAL; | |
892 | } | |
893 | ||
894 | if (addr->sq_family != AF_QIPCRTR) { | |
895 | release_sock(sk); | |
896 | return -EINVAL; | |
897 | } | |
898 | ||
899 | rc = qrtr_autobind(sock); | |
900 | if (rc) { | |
901 | release_sock(sk); | |
902 | return rc; | |
903 | } | |
904 | } else if (sk->sk_state == TCP_ESTABLISHED) { | |
905 | addr = &ipc->peer; | |
906 | } else { | |
907 | release_sock(sk); | |
908 | return -ENOTCONN; | |
909 | } | |
910 | ||
911 | node = NULL; | |
912 | if (addr->sq_node == QRTR_NODE_BCAST) { | |
913 | enqueue_fn = qrtr_bcast_enqueue; | |
fdf5fd39 AKN |
914 | if (addr->sq_port != QRTR_PORT_CTRL) { |
915 | release_sock(sk); | |
916 | return -ENOTCONN; | |
917 | } | |
bdabad3e CC |
918 | } else if (addr->sq_node == ipc->us.sq_node) { |
919 | enqueue_fn = qrtr_local_enqueue; | |
920 | } else { | |
921 | enqueue_fn = qrtr_node_enqueue; | |
922 | node = qrtr_node_lookup(addr->sq_node); | |
923 | if (!node) { | |
924 | release_sock(sk); | |
925 | return -ECONNRESET; | |
926 | } | |
927 | } | |
928 | ||
929 | plen = (len + 3) & ~3; | |
194ccc88 | 930 | skb = sock_alloc_send_skb(sk, plen + QRTR_HDR_MAX_SIZE, |
bdabad3e CC |
931 | msg->msg_flags & MSG_DONTWAIT, &rc); |
932 | if (!skb) | |
933 | goto out_node; | |
934 | ||
194ccc88 | 935 | skb_reserve(skb, QRTR_HDR_MAX_SIZE); |
bdabad3e | 936 | |
e7044482 | 937 | rc = memcpy_from_msg(skb_put(skb, len), msg, len); |
bdabad3e CC |
938 | if (rc) { |
939 | kfree_skb(skb); | |
940 | goto out_node; | |
941 | } | |
942 | ||
bdabad3e CC |
943 | if (ipc->us.sq_port == QRTR_PORT_CTRL) { |
944 | if (len < 4) { | |
945 | rc = -EINVAL; | |
946 | kfree_skb(skb); | |
947 | goto out_node; | |
948 | } | |
949 | ||
950 | /* control messages already require the type as 'command' */ | |
8f5e2451 | 951 | skb_copy_bits(skb, 0, &qrtr_type, 4); |
bdabad3e CC |
952 | } |
953 | ||
7036e621 | 954 | type = le32_to_cpu(qrtr_type); |
e7044482 | 955 | rc = enqueue_fn(node, skb, type, &ipc->us, addr); |
bdabad3e CC |
956 | if (rc >= 0) |
957 | rc = len; | |
958 | ||
959 | out_node: | |
960 | qrtr_node_release(node); | |
961 | release_sock(sk); | |
962 | ||
963 | return rc; | |
964 | } | |
965 | ||
cb6530b9 BA |
966 | static int qrtr_send_resume_tx(struct qrtr_cb *cb) |
967 | { | |
968 | struct sockaddr_qrtr remote = { AF_QIPCRTR, cb->src_node, cb->src_port }; | |
969 | struct sockaddr_qrtr local = { AF_QIPCRTR, cb->dst_node, cb->dst_port }; | |
970 | struct qrtr_ctrl_pkt *pkt; | |
971 | struct qrtr_node *node; | |
972 | struct sk_buff *skb; | |
973 | int ret; | |
974 | ||
975 | node = qrtr_node_lookup(remote.sq_node); | |
976 | if (!node) | |
977 | return -EINVAL; | |
978 | ||
979 | skb = qrtr_alloc_ctrl_packet(&pkt); | |
980 | if (!skb) | |
981 | return -ENOMEM; | |
982 | ||
983 | pkt->cmd = cpu_to_le32(QRTR_TYPE_RESUME_TX); | |
984 | pkt->client.node = cpu_to_le32(cb->dst_node); | |
985 | pkt->client.port = cpu_to_le32(cb->dst_port); | |
986 | ||
987 | ret = qrtr_node_enqueue(node, skb, QRTR_TYPE_RESUME_TX, &local, &remote); | |
988 | ||
989 | qrtr_node_release(node); | |
990 | ||
991 | return ret; | |
992 | } | |
993 | ||
bdabad3e CC |
994 | static int qrtr_recvmsg(struct socket *sock, struct msghdr *msg, |
995 | size_t size, int flags) | |
996 | { | |
997 | DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name); | |
bdabad3e CC |
998 | struct sock *sk = sock->sk; |
999 | struct sk_buff *skb; | |
f507a9b6 | 1000 | struct qrtr_cb *cb; |
bdabad3e CC |
1001 | int copied, rc; |
1002 | ||
1003 | lock_sock(sk); | |
1004 | ||
1005 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
1006 | release_sock(sk); | |
1007 | return -EADDRNOTAVAIL; | |
1008 | } | |
1009 | ||
1010 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
1011 | flags & MSG_DONTWAIT, &rc); | |
1012 | if (!skb) { | |
1013 | release_sock(sk); | |
1014 | return rc; | |
1015 | } | |
cb6530b9 | 1016 | cb = (struct qrtr_cb *)skb->cb; |
bdabad3e | 1017 | |
f507a9b6 | 1018 | copied = skb->len; |
bdabad3e CC |
1019 | if (copied > size) { |
1020 | copied = size; | |
1021 | msg->msg_flags |= MSG_TRUNC; | |
1022 | } | |
1023 | ||
f507a9b6 | 1024 | rc = skb_copy_datagram_msg(skb, 0, msg, copied); |
bdabad3e CC |
1025 | if (rc < 0) |
1026 | goto out; | |
1027 | rc = copied; | |
1028 | ||
1029 | if (addr) { | |
1030 | addr->sq_family = AF_QIPCRTR; | |
f507a9b6 BA |
1031 | addr->sq_node = cb->src_node; |
1032 | addr->sq_port = cb->src_port; | |
bdabad3e CC |
1033 | msg->msg_namelen = sizeof(*addr); |
1034 | } | |
1035 | ||
1036 | out: | |
cb6530b9 BA |
1037 | if (cb->confirm_rx) |
1038 | qrtr_send_resume_tx(cb); | |
1039 | ||
bdabad3e CC |
1040 | skb_free_datagram(sk, skb); |
1041 | release_sock(sk); | |
1042 | ||
1043 | return rc; | |
1044 | } | |
1045 | ||
1046 | static int qrtr_connect(struct socket *sock, struct sockaddr *saddr, | |
1047 | int len, int flags) | |
1048 | { | |
1049 | DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr); | |
1050 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
1051 | struct sock *sk = sock->sk; | |
1052 | int rc; | |
1053 | ||
1054 | if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR) | |
1055 | return -EINVAL; | |
1056 | ||
1057 | lock_sock(sk); | |
1058 | ||
1059 | sk->sk_state = TCP_CLOSE; | |
1060 | sock->state = SS_UNCONNECTED; | |
1061 | ||
1062 | rc = qrtr_autobind(sock); | |
1063 | if (rc) { | |
1064 | release_sock(sk); | |
1065 | return rc; | |
1066 | } | |
1067 | ||
1068 | ipc->peer = *addr; | |
1069 | sock->state = SS_CONNECTED; | |
1070 | sk->sk_state = TCP_ESTABLISHED; | |
1071 | ||
1072 | release_sock(sk); | |
1073 | ||
1074 | return 0; | |
1075 | } | |
1076 | ||
1077 | static int qrtr_getname(struct socket *sock, struct sockaddr *saddr, | |
9b2c45d4 | 1078 | int peer) |
bdabad3e CC |
1079 | { |
1080 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
1081 | struct sockaddr_qrtr qaddr; | |
1082 | struct sock *sk = sock->sk; | |
1083 | ||
1084 | lock_sock(sk); | |
1085 | if (peer) { | |
1086 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1087 | release_sock(sk); | |
1088 | return -ENOTCONN; | |
1089 | } | |
1090 | ||
1091 | qaddr = ipc->peer; | |
1092 | } else { | |
1093 | qaddr = ipc->us; | |
1094 | } | |
1095 | release_sock(sk); | |
1096 | ||
bdabad3e CC |
1097 | qaddr.sq_family = AF_QIPCRTR; |
1098 | ||
1099 | memcpy(saddr, &qaddr, sizeof(qaddr)); | |
1100 | ||
9b2c45d4 | 1101 | return sizeof(qaddr); |
bdabad3e CC |
1102 | } |
1103 | ||
1104 | static int qrtr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1105 | { | |
1106 | void __user *argp = (void __user *)arg; | |
1107 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
1108 | struct sock *sk = sock->sk; | |
1109 | struct sockaddr_qrtr *sq; | |
1110 | struct sk_buff *skb; | |
1111 | struct ifreq ifr; | |
1112 | long len = 0; | |
1113 | int rc = 0; | |
1114 | ||
1115 | lock_sock(sk); | |
1116 | ||
1117 | switch (cmd) { | |
1118 | case TIOCOUTQ: | |
1119 | len = sk->sk_sndbuf - sk_wmem_alloc_get(sk); | |
1120 | if (len < 0) | |
1121 | len = 0; | |
1122 | rc = put_user(len, (int __user *)argp); | |
1123 | break; | |
1124 | case TIOCINQ: | |
1125 | skb = skb_peek(&sk->sk_receive_queue); | |
1126 | if (skb) | |
f507a9b6 | 1127 | len = skb->len; |
bdabad3e CC |
1128 | rc = put_user(len, (int __user *)argp); |
1129 | break; | |
1130 | case SIOCGIFADDR: | |
1131 | if (copy_from_user(&ifr, argp, sizeof(ifr))) { | |
1132 | rc = -EFAULT; | |
1133 | break; | |
1134 | } | |
1135 | ||
1136 | sq = (struct sockaddr_qrtr *)&ifr.ifr_addr; | |
1137 | *sq = ipc->us; | |
1138 | if (copy_to_user(argp, &ifr, sizeof(ifr))) { | |
1139 | rc = -EFAULT; | |
1140 | break; | |
1141 | } | |
1142 | break; | |
bdabad3e CC |
1143 | case SIOCADDRT: |
1144 | case SIOCDELRT: | |
1145 | case SIOCSIFADDR: | |
1146 | case SIOCGIFDSTADDR: | |
1147 | case SIOCSIFDSTADDR: | |
1148 | case SIOCGIFBRDADDR: | |
1149 | case SIOCSIFBRDADDR: | |
1150 | case SIOCGIFNETMASK: | |
1151 | case SIOCSIFNETMASK: | |
1152 | rc = -EINVAL; | |
1153 | break; | |
1154 | default: | |
1155 | rc = -ENOIOCTLCMD; | |
1156 | break; | |
1157 | } | |
1158 | ||
1159 | release_sock(sk); | |
1160 | ||
1161 | return rc; | |
1162 | } | |
1163 | ||
1164 | static int qrtr_release(struct socket *sock) | |
1165 | { | |
1166 | struct sock *sk = sock->sk; | |
1167 | struct qrtr_sock *ipc; | |
1168 | ||
1169 | if (!sk) | |
1170 | return 0; | |
1171 | ||
1172 | lock_sock(sk); | |
1173 | ||
1174 | ipc = qrtr_sk(sk); | |
1175 | sk->sk_shutdown = SHUTDOWN_MASK; | |
1176 | if (!sock_flag(sk, SOCK_DEAD)) | |
1177 | sk->sk_state_change(sk); | |
1178 | ||
1179 | sock_set_flag(sk, SOCK_DEAD); | |
1180 | sock->sk = NULL; | |
1181 | ||
1182 | if (!sock_flag(sk, SOCK_ZAPPED)) | |
1183 | qrtr_port_remove(ipc); | |
1184 | ||
1185 | skb_queue_purge(&sk->sk_receive_queue); | |
1186 | ||
1187 | release_sock(sk); | |
1188 | sock_put(sk); | |
1189 | ||
1190 | return 0; | |
1191 | } | |
1192 | ||
1193 | static const struct proto_ops qrtr_proto_ops = { | |
1194 | .owner = THIS_MODULE, | |
1195 | .family = AF_QIPCRTR, | |
1196 | .bind = qrtr_bind, | |
1197 | .connect = qrtr_connect, | |
1198 | .socketpair = sock_no_socketpair, | |
1199 | .accept = sock_no_accept, | |
1200 | .listen = sock_no_listen, | |
1201 | .sendmsg = qrtr_sendmsg, | |
1202 | .recvmsg = qrtr_recvmsg, | |
1203 | .getname = qrtr_getname, | |
1204 | .ioctl = qrtr_ioctl, | |
c7cbdbf2 | 1205 | .gettstamp = sock_gettstamp, |
a11e1d43 | 1206 | .poll = datagram_poll, |
bdabad3e CC |
1207 | .shutdown = sock_no_shutdown, |
1208 | .setsockopt = sock_no_setsockopt, | |
1209 | .getsockopt = sock_no_getsockopt, | |
1210 | .release = qrtr_release, | |
1211 | .mmap = sock_no_mmap, | |
1212 | .sendpage = sock_no_sendpage, | |
1213 | }; | |
1214 | ||
1215 | static struct proto qrtr_proto = { | |
1216 | .name = "QIPCRTR", | |
1217 | .owner = THIS_MODULE, | |
1218 | .obj_size = sizeof(struct qrtr_sock), | |
1219 | }; | |
1220 | ||
1221 | static int qrtr_create(struct net *net, struct socket *sock, | |
1222 | int protocol, int kern) | |
1223 | { | |
1224 | struct qrtr_sock *ipc; | |
1225 | struct sock *sk; | |
1226 | ||
1227 | if (sock->type != SOCK_DGRAM) | |
1228 | return -EPROTOTYPE; | |
1229 | ||
1230 | sk = sk_alloc(net, AF_QIPCRTR, GFP_KERNEL, &qrtr_proto, kern); | |
1231 | if (!sk) | |
1232 | return -ENOMEM; | |
1233 | ||
1234 | sock_set_flag(sk, SOCK_ZAPPED); | |
1235 | ||
1236 | sock_init_data(sock, sk); | |
1237 | sock->ops = &qrtr_proto_ops; | |
1238 | ||
1239 | ipc = qrtr_sk(sk); | |
1240 | ipc->us.sq_family = AF_QIPCRTR; | |
1241 | ipc->us.sq_node = qrtr_local_nid; | |
1242 | ipc->us.sq_port = 0; | |
1243 | ||
1244 | return 0; | |
1245 | } | |
1246 | ||
bdabad3e CC |
1247 | static const struct net_proto_family qrtr_family = { |
1248 | .owner = THIS_MODULE, | |
1249 | .family = AF_QIPCRTR, | |
1250 | .create = qrtr_create, | |
1251 | }; | |
1252 | ||
1253 | static int __init qrtr_proto_init(void) | |
1254 | { | |
1255 | int rc; | |
1256 | ||
1257 | rc = proto_register(&qrtr_proto, 1); | |
1258 | if (rc) | |
1259 | return rc; | |
1260 | ||
1261 | rc = sock_register(&qrtr_family); | |
1262 | if (rc) { | |
1263 | proto_unregister(&qrtr_proto); | |
1264 | return rc; | |
1265 | } | |
1266 | ||
0c2204a4 MS |
1267 | /* FIXME: Currently, this 2s delay is required to catch the NEW_SERVER |
1268 | * messages from routers. But the fix could be somewhere else. | |
1269 | */ | |
1270 | INIT_DELAYED_WORK(&qrtr_ns_work, qrtr_ns_init); | |
1271 | schedule_delayed_work(&qrtr_ns_work, msecs_to_jiffies(2000)); | |
bdabad3e | 1272 | |
c1c502b5 | 1273 | return rc; |
bdabad3e | 1274 | } |
b7e732fa | 1275 | postcore_initcall(qrtr_proto_init); |
bdabad3e CC |
1276 | |
1277 | static void __exit qrtr_proto_fini(void) | |
1278 | { | |
0c2204a4 MS |
1279 | cancel_delayed_work_sync(&qrtr_ns_work); |
1280 | qrtr_ns_remove(); | |
bdabad3e CC |
1281 | sock_unregister(qrtr_family.family); |
1282 | proto_unregister(&qrtr_proto); | |
1283 | } | |
1284 | module_exit(qrtr_proto_fini); | |
1285 | ||
1286 | MODULE_DESCRIPTION("Qualcomm IPC-router driver"); | |
1287 | MODULE_LICENSE("GPL v2"); | |
77ac725e | 1288 | MODULE_ALIAS_NETPROTO(PF_QIPCRTR); |