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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> |
bdabad3e CC |
13 | |
14 | #include <net/sock.h> | |
15 | ||
16 | #include "qrtr.h" | |
17 | ||
194ccc88 BA |
18 | #define QRTR_PROTO_VER_1 1 |
19 | #define QRTR_PROTO_VER_2 3 | |
bdabad3e CC |
20 | |
21 | /* auto-bind range */ | |
22 | #define QRTR_MIN_EPH_SOCKET 0x4000 | |
23 | #define QRTR_MAX_EPH_SOCKET 0x7fff | |
24 | ||
bdabad3e | 25 | /** |
194ccc88 | 26 | * struct qrtr_hdr_v1 - (I|R)PCrouter packet header version 1 |
bdabad3e CC |
27 | * @version: protocol version |
28 | * @type: packet type; one of QRTR_TYPE_* | |
29 | * @src_node_id: source node | |
30 | * @src_port_id: source port | |
31 | * @confirm_rx: boolean; whether a resume-tx packet should be send in reply | |
32 | * @size: length of packet, excluding this header | |
33 | * @dst_node_id: destination node | |
34 | * @dst_port_id: destination port | |
35 | */ | |
194ccc88 | 36 | struct qrtr_hdr_v1 { |
bdabad3e CC |
37 | __le32 version; |
38 | __le32 type; | |
39 | __le32 src_node_id; | |
40 | __le32 src_port_id; | |
41 | __le32 confirm_rx; | |
42 | __le32 size; | |
43 | __le32 dst_node_id; | |
44 | __le32 dst_port_id; | |
45 | } __packed; | |
46 | ||
194ccc88 BA |
47 | /** |
48 | * struct qrtr_hdr_v2 - (I|R)PCrouter packet header later versions | |
49 | * @version: protocol version | |
50 | * @type: packet type; one of QRTR_TYPE_* | |
51 | * @flags: bitmask of QRTR_FLAGS_* | |
52 | * @optlen: length of optional header data | |
53 | * @size: length of packet, excluding this header and optlen | |
54 | * @src_node_id: source node | |
55 | * @src_port_id: source port | |
56 | * @dst_node_id: destination node | |
57 | * @dst_port_id: destination port | |
58 | */ | |
59 | struct qrtr_hdr_v2 { | |
60 | u8 version; | |
61 | u8 type; | |
62 | u8 flags; | |
63 | u8 optlen; | |
64 | __le32 size; | |
65 | __le16 src_node_id; | |
66 | __le16 src_port_id; | |
67 | __le16 dst_node_id; | |
68 | __le16 dst_port_id; | |
69 | }; | |
70 | ||
71 | #define QRTR_FLAGS_CONFIRM_RX BIT(0) | |
72 | ||
f507a9b6 BA |
73 | struct qrtr_cb { |
74 | u32 src_node; | |
75 | u32 src_port; | |
76 | u32 dst_node; | |
77 | u32 dst_port; | |
78 | ||
79 | u8 type; | |
80 | u8 confirm_rx; | |
81 | }; | |
82 | ||
194ccc88 BA |
83 | #define QRTR_HDR_MAX_SIZE max_t(size_t, sizeof(struct qrtr_hdr_v1), \ |
84 | sizeof(struct qrtr_hdr_v2)) | |
bdabad3e CC |
85 | |
86 | struct qrtr_sock { | |
87 | /* WARNING: sk must be the first member */ | |
88 | struct sock sk; | |
89 | struct sockaddr_qrtr us; | |
90 | struct sockaddr_qrtr peer; | |
91 | }; | |
92 | ||
93 | static inline struct qrtr_sock *qrtr_sk(struct sock *sk) | |
94 | { | |
95 | BUILD_BUG_ON(offsetof(struct qrtr_sock, sk) != 0); | |
96 | return container_of(sk, struct qrtr_sock, sk); | |
97 | } | |
98 | ||
98fa15f3 | 99 | static unsigned int qrtr_local_nid = NUMA_NO_NODE; |
bdabad3e CC |
100 | |
101 | /* for node ids */ | |
0a7e0d0e BA |
102 | static RADIX_TREE(qrtr_nodes, GFP_ATOMIC); |
103 | static DEFINE_SPINLOCK(qrtr_nodes_lock); | |
bdabad3e CC |
104 | /* broadcast list */ |
105 | static LIST_HEAD(qrtr_all_nodes); | |
0a7e0d0e | 106 | /* lock for qrtr_all_nodes and node reference */ |
bdabad3e CC |
107 | static DEFINE_MUTEX(qrtr_node_lock); |
108 | ||
109 | /* local port allocation management */ | |
110 | static DEFINE_IDR(qrtr_ports); | |
111 | static DEFINE_MUTEX(qrtr_port_lock); | |
112 | ||
113 | /** | |
114 | * struct qrtr_node - endpoint node | |
115 | * @ep_lock: lock for endpoint management and callbacks | |
116 | * @ep: endpoint | |
117 | * @ref: reference count for node | |
118 | * @nid: node id | |
5fdeb0d3 BA |
119 | * @qrtr_tx_flow: tree of qrtr_tx_flow, keyed by node << 32 | port |
120 | * @qrtr_tx_lock: lock for qrtr_tx_flow inserts | |
bdabad3e CC |
121 | * @rx_queue: receive queue |
122 | * @work: scheduled work struct for recv work | |
123 | * @item: list item for broadcast list | |
124 | */ | |
125 | struct qrtr_node { | |
126 | struct mutex ep_lock; | |
127 | struct qrtr_endpoint *ep; | |
128 | struct kref ref; | |
129 | unsigned int nid; | |
130 | ||
5fdeb0d3 BA |
131 | struct radix_tree_root qrtr_tx_flow; |
132 | struct mutex qrtr_tx_lock; /* for qrtr_tx_flow */ | |
133 | ||
bdabad3e CC |
134 | struct sk_buff_head rx_queue; |
135 | struct work_struct work; | |
136 | struct list_head item; | |
137 | }; | |
138 | ||
5fdeb0d3 BA |
139 | /** |
140 | * struct qrtr_tx_flow - tx flow control | |
141 | * @resume_tx: waiters for a resume tx from the remote | |
142 | * @pending: number of waiting senders | |
143 | * @tx_failed: indicates that a message with confirm_rx flag was lost | |
144 | */ | |
145 | struct qrtr_tx_flow { | |
146 | struct wait_queue_head resume_tx; | |
147 | int pending; | |
148 | int tx_failed; | |
149 | }; | |
150 | ||
151 | #define QRTR_TX_FLOW_HIGH 10 | |
152 | #define QRTR_TX_FLOW_LOW 5 | |
153 | ||
e7044482 BA |
154 | static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb, |
155 | int type, struct sockaddr_qrtr *from, | |
156 | struct sockaddr_qrtr *to); | |
157 | static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb, | |
158 | int type, struct sockaddr_qrtr *from, | |
159 | struct sockaddr_qrtr *to); | |
8acc8ee4 | 160 | |
bdabad3e CC |
161 | /* Release node resources and free the node. |
162 | * | |
163 | * Do not call directly, use qrtr_node_release. To be used with | |
164 | * kref_put_mutex. As such, the node mutex is expected to be locked on call. | |
165 | */ | |
166 | static void __qrtr_node_release(struct kref *kref) | |
167 | { | |
168 | struct qrtr_node *node = container_of(kref, struct qrtr_node, ref); | |
5fdeb0d3 | 169 | struct radix_tree_iter iter; |
0a7e0d0e | 170 | unsigned long flags; |
5fdeb0d3 | 171 | void __rcu **slot; |
bdabad3e | 172 | |
0a7e0d0e | 173 | spin_lock_irqsave(&qrtr_nodes_lock, flags); |
bdabad3e CC |
174 | if (node->nid != QRTR_EP_NID_AUTO) |
175 | radix_tree_delete(&qrtr_nodes, node->nid); | |
0a7e0d0e | 176 | spin_unlock_irqrestore(&qrtr_nodes_lock, flags); |
bdabad3e CC |
177 | |
178 | list_del(&node->item); | |
179 | mutex_unlock(&qrtr_node_lock); | |
180 | ||
73f0c11d | 181 | cancel_work_sync(&node->work); |
bdabad3e | 182 | skb_queue_purge(&node->rx_queue); |
5fdeb0d3 BA |
183 | |
184 | /* Free tx flow counters */ | |
185 | radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) { | |
186 | radix_tree_iter_delete(&node->qrtr_tx_flow, &iter, slot); | |
187 | kfree(*slot); | |
188 | } | |
bdabad3e CC |
189 | kfree(node); |
190 | } | |
191 | ||
192 | /* Increment reference to node. */ | |
193 | static struct qrtr_node *qrtr_node_acquire(struct qrtr_node *node) | |
194 | { | |
195 | if (node) | |
196 | kref_get(&node->ref); | |
197 | return node; | |
198 | } | |
199 | ||
200 | /* Decrement reference to node and release as necessary. */ | |
201 | static void qrtr_node_release(struct qrtr_node *node) | |
202 | { | |
203 | if (!node) | |
204 | return; | |
205 | kref_put_mutex(&node->ref, __qrtr_node_release, &qrtr_node_lock); | |
206 | } | |
207 | ||
5fdeb0d3 BA |
208 | /** |
209 | * qrtr_tx_resume() - reset flow control counter | |
210 | * @node: qrtr_node that the QRTR_TYPE_RESUME_TX packet arrived on | |
211 | * @skb: resume_tx packet | |
212 | */ | |
213 | static void qrtr_tx_resume(struct qrtr_node *node, struct sk_buff *skb) | |
214 | { | |
215 | struct qrtr_ctrl_pkt *pkt = (struct qrtr_ctrl_pkt *)skb->data; | |
216 | u64 remote_node = le32_to_cpu(pkt->client.node); | |
217 | u32 remote_port = le32_to_cpu(pkt->client.port); | |
218 | struct qrtr_tx_flow *flow; | |
219 | unsigned long key; | |
220 | ||
221 | key = remote_node << 32 | remote_port; | |
222 | ||
223 | rcu_read_lock(); | |
224 | flow = radix_tree_lookup(&node->qrtr_tx_flow, key); | |
225 | rcu_read_unlock(); | |
226 | if (flow) { | |
227 | spin_lock(&flow->resume_tx.lock); | |
228 | flow->pending = 0; | |
229 | spin_unlock(&flow->resume_tx.lock); | |
230 | wake_up_interruptible_all(&flow->resume_tx); | |
231 | } | |
232 | ||
233 | consume_skb(skb); | |
234 | } | |
235 | ||
236 | /** | |
237 | * qrtr_tx_wait() - flow control for outgoing packets | |
238 | * @node: qrtr_node that the packet is to be send to | |
239 | * @dest_node: node id of the destination | |
240 | * @dest_port: port number of the destination | |
241 | * @type: type of message | |
242 | * | |
243 | * The flow control scheme is based around the low and high "watermarks". When | |
244 | * the low watermark is passed the confirm_rx flag is set on the outgoing | |
245 | * message, which will trigger the remote to send a control message of the type | |
246 | * QRTR_TYPE_RESUME_TX to reset the counter. If the high watermark is hit | |
247 | * further transmision should be paused. | |
248 | * | |
249 | * Return: 1 if confirm_rx should be set, 0 otherwise or errno failure | |
250 | */ | |
251 | static int qrtr_tx_wait(struct qrtr_node *node, int dest_node, int dest_port, | |
252 | int type) | |
253 | { | |
254 | unsigned long key = (u64)dest_node << 32 | dest_port; | |
255 | struct qrtr_tx_flow *flow; | |
256 | int confirm_rx = 0; | |
257 | int ret; | |
258 | ||
259 | /* Never set confirm_rx on non-data packets */ | |
260 | if (type != QRTR_TYPE_DATA) | |
261 | return 0; | |
262 | ||
263 | mutex_lock(&node->qrtr_tx_lock); | |
264 | flow = radix_tree_lookup(&node->qrtr_tx_flow, key); | |
265 | if (!flow) { | |
266 | flow = kzalloc(sizeof(*flow), GFP_KERNEL); | |
267 | if (flow) { | |
268 | init_waitqueue_head(&flow->resume_tx); | |
269 | radix_tree_insert(&node->qrtr_tx_flow, key, flow); | |
270 | } | |
271 | } | |
272 | mutex_unlock(&node->qrtr_tx_lock); | |
273 | ||
274 | /* Set confirm_rx if we where unable to find and allocate a flow */ | |
275 | if (!flow) | |
276 | return 1; | |
277 | ||
278 | spin_lock_irq(&flow->resume_tx.lock); | |
279 | ret = wait_event_interruptible_locked_irq(flow->resume_tx, | |
280 | flow->pending < QRTR_TX_FLOW_HIGH || | |
281 | flow->tx_failed || | |
282 | !node->ep); | |
283 | if (ret < 0) { | |
284 | confirm_rx = ret; | |
285 | } else if (!node->ep) { | |
286 | confirm_rx = -EPIPE; | |
287 | } else if (flow->tx_failed) { | |
288 | flow->tx_failed = 0; | |
289 | confirm_rx = 1; | |
290 | } else { | |
291 | flow->pending++; | |
292 | confirm_rx = flow->pending == QRTR_TX_FLOW_LOW; | |
293 | } | |
294 | spin_unlock_irq(&flow->resume_tx.lock); | |
295 | ||
296 | return confirm_rx; | |
297 | } | |
298 | ||
299 | /** | |
300 | * qrtr_tx_flow_failed() - flag that tx of confirm_rx flagged messages failed | |
301 | * @node: qrtr_node that the packet is to be send to | |
302 | * @dest_node: node id of the destination | |
303 | * @dest_port: port number of the destination | |
304 | * | |
305 | * Signal that the transmission of a message with confirm_rx flag failed. The | |
306 | * flow's "pending" counter will keep incrementing towards QRTR_TX_FLOW_HIGH, | |
307 | * at which point transmission would stall forever waiting for the resume TX | |
308 | * message associated with the dropped confirm_rx message. | |
309 | * Work around this by marking the flow as having a failed transmission and | |
310 | * cause the next transmission attempt to be sent with the confirm_rx. | |
311 | */ | |
312 | static void qrtr_tx_flow_failed(struct qrtr_node *node, int dest_node, | |
313 | int dest_port) | |
314 | { | |
315 | unsigned long key = (u64)dest_node << 32 | dest_port; | |
316 | struct qrtr_tx_flow *flow; | |
317 | ||
318 | rcu_read_lock(); | |
319 | flow = radix_tree_lookup(&node->qrtr_tx_flow, key); | |
320 | rcu_read_unlock(); | |
321 | if (flow) { | |
322 | spin_lock_irq(&flow->resume_tx.lock); | |
323 | flow->tx_failed = 1; | |
324 | spin_unlock_irq(&flow->resume_tx.lock); | |
325 | } | |
326 | } | |
327 | ||
bdabad3e | 328 | /* Pass an outgoing packet socket buffer to the endpoint driver. */ |
e7044482 BA |
329 | static int qrtr_node_enqueue(struct qrtr_node *node, struct sk_buff *skb, |
330 | int type, struct sockaddr_qrtr *from, | |
331 | struct sockaddr_qrtr *to) | |
bdabad3e | 332 | { |
194ccc88 | 333 | struct qrtr_hdr_v1 *hdr; |
e7044482 | 334 | size_t len = skb->len; |
bdabad3e | 335 | int rc = -ENODEV; |
5fdeb0d3 BA |
336 | int confirm_rx; |
337 | ||
338 | confirm_rx = qrtr_tx_wait(node, to->sq_node, to->sq_port, type); | |
339 | if (confirm_rx < 0) { | |
340 | kfree_skb(skb); | |
341 | return confirm_rx; | |
342 | } | |
bdabad3e | 343 | |
194ccc88 BA |
344 | hdr = skb_push(skb, sizeof(*hdr)); |
345 | hdr->version = cpu_to_le32(QRTR_PROTO_VER_1); | |
e7044482 BA |
346 | hdr->type = cpu_to_le32(type); |
347 | hdr->src_node_id = cpu_to_le32(from->sq_node); | |
348 | hdr->src_port_id = cpu_to_le32(from->sq_port); | |
d27e77a3 AKN |
349 | if (to->sq_port == QRTR_PORT_CTRL) { |
350 | hdr->dst_node_id = cpu_to_le32(node->nid); | |
351 | hdr->dst_port_id = cpu_to_le32(QRTR_NODE_BCAST); | |
352 | } else { | |
353 | hdr->dst_node_id = cpu_to_le32(to->sq_node); | |
354 | hdr->dst_port_id = cpu_to_le32(to->sq_port); | |
355 | } | |
e7044482 BA |
356 | |
357 | hdr->size = cpu_to_le32(len); | |
5fdeb0d3 | 358 | hdr->confirm_rx = !!confirm_rx; |
e7044482 | 359 | |
ce57785b | 360 | skb_put_padto(skb, ALIGN(len, 4) + sizeof(*hdr)); |
e7044482 | 361 | |
bdabad3e CC |
362 | mutex_lock(&node->ep_lock); |
363 | if (node->ep) | |
364 | rc = node->ep->xmit(node->ep, skb); | |
365 | else | |
366 | kfree_skb(skb); | |
367 | mutex_unlock(&node->ep_lock); | |
368 | ||
5fdeb0d3 BA |
369 | /* Need to ensure that a subsequent message carries the otherwise lost |
370 | * confirm_rx flag if we dropped this one */ | |
371 | if (rc && confirm_rx) | |
372 | qrtr_tx_flow_failed(node, to->sq_node, to->sq_port); | |
373 | ||
bdabad3e CC |
374 | return rc; |
375 | } | |
376 | ||
377 | /* Lookup node by id. | |
378 | * | |
379 | * callers must release with qrtr_node_release() | |
380 | */ | |
381 | static struct qrtr_node *qrtr_node_lookup(unsigned int nid) | |
382 | { | |
383 | struct qrtr_node *node; | |
0a7e0d0e | 384 | unsigned long flags; |
bdabad3e | 385 | |
0a7e0d0e | 386 | spin_lock_irqsave(&qrtr_nodes_lock, flags); |
bdabad3e CC |
387 | node = radix_tree_lookup(&qrtr_nodes, nid); |
388 | node = qrtr_node_acquire(node); | |
0a7e0d0e | 389 | spin_unlock_irqrestore(&qrtr_nodes_lock, flags); |
bdabad3e CC |
390 | |
391 | return node; | |
392 | } | |
393 | ||
394 | /* Assign node id to node. | |
395 | * | |
396 | * This is mostly useful for automatic node id assignment, based on | |
397 | * the source id in the incoming packet. | |
398 | */ | |
399 | static void qrtr_node_assign(struct qrtr_node *node, unsigned int nid) | |
400 | { | |
0a7e0d0e BA |
401 | unsigned long flags; |
402 | ||
bdabad3e CC |
403 | if (node->nid != QRTR_EP_NID_AUTO || nid == QRTR_EP_NID_AUTO) |
404 | return; | |
405 | ||
0a7e0d0e | 406 | spin_lock_irqsave(&qrtr_nodes_lock, flags); |
bdabad3e CC |
407 | radix_tree_insert(&qrtr_nodes, nid, node); |
408 | node->nid = nid; | |
0a7e0d0e | 409 | spin_unlock_irqrestore(&qrtr_nodes_lock, flags); |
bdabad3e CC |
410 | } |
411 | ||
412 | /** | |
413 | * qrtr_endpoint_post() - post incoming data | |
414 | * @ep: endpoint handle | |
415 | * @data: data pointer | |
416 | * @len: size of data in bytes | |
417 | * | |
418 | * Return: 0 on success; negative error code on failure | |
419 | */ | |
420 | int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len) | |
421 | { | |
422 | struct qrtr_node *node = ep->node; | |
194ccc88 BA |
423 | const struct qrtr_hdr_v1 *v1; |
424 | const struct qrtr_hdr_v2 *v2; | |
bdabad3e | 425 | struct sk_buff *skb; |
f507a9b6 | 426 | struct qrtr_cb *cb; |
bdabad3e | 427 | unsigned int size; |
bdabad3e | 428 | unsigned int ver; |
194ccc88 | 429 | size_t hdrlen; |
bdabad3e | 430 | |
194ccc88 | 431 | if (len & 3) |
bdabad3e CC |
432 | return -EINVAL; |
433 | ||
434 | skb = netdev_alloc_skb(NULL, len); | |
435 | if (!skb) | |
436 | return -ENOMEM; | |
437 | ||
f507a9b6 | 438 | cb = (struct qrtr_cb *)skb->cb; |
f507a9b6 | 439 | |
194ccc88 BA |
440 | /* Version field in v1 is little endian, so this works for both cases */ |
441 | ver = *(u8*)data; | |
442 | ||
443 | switch (ver) { | |
444 | case QRTR_PROTO_VER_1: | |
445 | v1 = data; | |
446 | hdrlen = sizeof(*v1); | |
447 | ||
448 | cb->type = le32_to_cpu(v1->type); | |
449 | cb->src_node = le32_to_cpu(v1->src_node_id); | |
450 | cb->src_port = le32_to_cpu(v1->src_port_id); | |
451 | cb->confirm_rx = !!v1->confirm_rx; | |
452 | cb->dst_node = le32_to_cpu(v1->dst_node_id); | |
453 | cb->dst_port = le32_to_cpu(v1->dst_port_id); | |
454 | ||
455 | size = le32_to_cpu(v1->size); | |
456 | break; | |
457 | case QRTR_PROTO_VER_2: | |
458 | v2 = data; | |
459 | hdrlen = sizeof(*v2) + v2->optlen; | |
460 | ||
461 | cb->type = v2->type; | |
462 | cb->confirm_rx = !!(v2->flags & QRTR_FLAGS_CONFIRM_RX); | |
463 | cb->src_node = le16_to_cpu(v2->src_node_id); | |
464 | cb->src_port = le16_to_cpu(v2->src_port_id); | |
465 | cb->dst_node = le16_to_cpu(v2->dst_node_id); | |
466 | cb->dst_port = le16_to_cpu(v2->dst_port_id); | |
467 | ||
468 | if (cb->src_port == (u16)QRTR_PORT_CTRL) | |
469 | cb->src_port = QRTR_PORT_CTRL; | |
470 | if (cb->dst_port == (u16)QRTR_PORT_CTRL) | |
471 | cb->dst_port = QRTR_PORT_CTRL; | |
472 | ||
473 | size = le32_to_cpu(v2->size); | |
474 | break; | |
475 | default: | |
476 | pr_err("qrtr: Invalid version %d\n", ver); | |
477 | goto err; | |
478 | } | |
479 | ||
480 | if (len != ALIGN(size, 4) + hdrlen) | |
481 | goto err; | |
482 | ||
5fdeb0d3 BA |
483 | if (cb->dst_port != QRTR_PORT_CTRL && cb->type != QRTR_TYPE_DATA && |
484 | cb->type != QRTR_TYPE_RESUME_TX) | |
194ccc88 BA |
485 | goto err; |
486 | ||
487 | skb_put_data(skb, data + hdrlen, size); | |
bdabad3e CC |
488 | |
489 | skb_queue_tail(&node->rx_queue, skb); | |
490 | schedule_work(&node->work); | |
491 | ||
492 | return 0; | |
194ccc88 BA |
493 | |
494 | err: | |
495 | kfree_skb(skb); | |
496 | return -EINVAL; | |
497 | ||
bdabad3e CC |
498 | } |
499 | EXPORT_SYMBOL_GPL(qrtr_endpoint_post); | |
500 | ||
1a7959c7 BA |
501 | /** |
502 | * qrtr_alloc_ctrl_packet() - allocate control packet skb | |
503 | * @pkt: reference to qrtr_ctrl_pkt pointer | |
504 | * | |
505 | * Returns newly allocated sk_buff, or NULL on failure | |
506 | * | |
507 | * This function allocates a sk_buff large enough to carry a qrtr_ctrl_pkt and | |
508 | * on success returns a reference to the control packet in @pkt. | |
509 | */ | |
510 | static struct sk_buff *qrtr_alloc_ctrl_packet(struct qrtr_ctrl_pkt **pkt) | |
bdabad3e | 511 | { |
1a7959c7 | 512 | const int pkt_len = sizeof(struct qrtr_ctrl_pkt); |
bdabad3e | 513 | struct sk_buff *skb; |
bdabad3e | 514 | |
194ccc88 | 515 | skb = alloc_skb(QRTR_HDR_MAX_SIZE + pkt_len, GFP_KERNEL); |
bdabad3e CC |
516 | if (!skb) |
517 | return NULL; | |
bdabad3e | 518 | |
194ccc88 | 519 | skb_reserve(skb, QRTR_HDR_MAX_SIZE); |
1a7959c7 | 520 | *pkt = skb_put_zero(skb, pkt_len); |
1784473b BA |
521 | |
522 | return skb; | |
523 | } | |
524 | ||
bdabad3e CC |
525 | static struct qrtr_sock *qrtr_port_lookup(int port); |
526 | static void qrtr_port_put(struct qrtr_sock *ipc); | |
527 | ||
528 | /* Handle and route a received packet. | |
529 | * | |
530 | * This will auto-reply with resume-tx packet as necessary. | |
531 | */ | |
532 | static void qrtr_node_rx_work(struct work_struct *work) | |
533 | { | |
534 | struct qrtr_node *node = container_of(work, struct qrtr_node, work); | |
535 | struct sk_buff *skb; | |
536 | ||
537 | while ((skb = skb_dequeue(&node->rx_queue)) != NULL) { | |
bdabad3e | 538 | struct qrtr_sock *ipc; |
cb6530b9 | 539 | struct qrtr_cb *cb = (struct qrtr_cb *)skb->cb; |
bdabad3e | 540 | |
f507a9b6 | 541 | qrtr_node_assign(node, cb->src_node); |
e7044482 | 542 | |
5fdeb0d3 BA |
543 | if (cb->type == QRTR_TYPE_RESUME_TX) { |
544 | qrtr_tx_resume(node, skb); | |
bdabad3e | 545 | } else { |
5fdeb0d3 BA |
546 | ipc = qrtr_port_lookup(cb->dst_port); |
547 | if (!ipc) { | |
bdabad3e | 548 | kfree_skb(skb); |
5fdeb0d3 BA |
549 | } else { |
550 | if (sock_queue_rcv_skb(&ipc->sk, skb)) | |
551 | kfree_skb(skb); | |
bdabad3e | 552 | |
5fdeb0d3 BA |
553 | qrtr_port_put(ipc); |
554 | } | |
bdabad3e | 555 | } |
bdabad3e CC |
556 | } |
557 | } | |
558 | ||
559 | /** | |
560 | * qrtr_endpoint_register() - register a new endpoint | |
561 | * @ep: endpoint to register | |
562 | * @nid: desired node id; may be QRTR_EP_NID_AUTO for auto-assignment | |
563 | * Return: 0 on success; negative error code on failure | |
564 | * | |
565 | * The specified endpoint must have the xmit function pointer set on call. | |
566 | */ | |
567 | int qrtr_endpoint_register(struct qrtr_endpoint *ep, unsigned int nid) | |
568 | { | |
569 | struct qrtr_node *node; | |
570 | ||
571 | if (!ep || !ep->xmit) | |
572 | return -EINVAL; | |
573 | ||
574 | node = kzalloc(sizeof(*node), GFP_KERNEL); | |
575 | if (!node) | |
576 | return -ENOMEM; | |
577 | ||
578 | INIT_WORK(&node->work, qrtr_node_rx_work); | |
579 | kref_init(&node->ref); | |
580 | mutex_init(&node->ep_lock); | |
581 | skb_queue_head_init(&node->rx_queue); | |
582 | node->nid = QRTR_EP_NID_AUTO; | |
583 | node->ep = ep; | |
584 | ||
5fdeb0d3 BA |
585 | INIT_RADIX_TREE(&node->qrtr_tx_flow, GFP_KERNEL); |
586 | mutex_init(&node->qrtr_tx_lock); | |
587 | ||
bdabad3e CC |
588 | qrtr_node_assign(node, nid); |
589 | ||
590 | mutex_lock(&qrtr_node_lock); | |
591 | list_add(&node->item, &qrtr_all_nodes); | |
592 | mutex_unlock(&qrtr_node_lock); | |
593 | ep->node = node; | |
594 | ||
595 | return 0; | |
596 | } | |
597 | EXPORT_SYMBOL_GPL(qrtr_endpoint_register); | |
598 | ||
599 | /** | |
600 | * qrtr_endpoint_unregister - unregister endpoint | |
601 | * @ep: endpoint to unregister | |
602 | */ | |
603 | void qrtr_endpoint_unregister(struct qrtr_endpoint *ep) | |
604 | { | |
605 | struct qrtr_node *node = ep->node; | |
e7044482 BA |
606 | struct sockaddr_qrtr src = {AF_QIPCRTR, node->nid, QRTR_PORT_CTRL}; |
607 | struct sockaddr_qrtr dst = {AF_QIPCRTR, qrtr_local_nid, QRTR_PORT_CTRL}; | |
5fdeb0d3 | 608 | struct radix_tree_iter iter; |
1a7959c7 | 609 | struct qrtr_ctrl_pkt *pkt; |
5fdeb0d3 | 610 | struct qrtr_tx_flow *flow; |
8acc8ee4 | 611 | struct sk_buff *skb; |
5fdeb0d3 | 612 | void __rcu **slot; |
bdabad3e CC |
613 | |
614 | mutex_lock(&node->ep_lock); | |
615 | node->ep = NULL; | |
616 | mutex_unlock(&node->ep_lock); | |
617 | ||
8acc8ee4 | 618 | /* Notify the local controller about the event */ |
1a7959c7 BA |
619 | skb = qrtr_alloc_ctrl_packet(&pkt); |
620 | if (skb) { | |
621 | pkt->cmd = cpu_to_le32(QRTR_TYPE_BYE); | |
e7044482 | 622 | qrtr_local_enqueue(NULL, skb, QRTR_TYPE_BYE, &src, &dst); |
1a7959c7 | 623 | } |
8acc8ee4 | 624 | |
5fdeb0d3 BA |
625 | /* Wake up any transmitters waiting for resume-tx from the node */ |
626 | mutex_lock(&node->qrtr_tx_lock); | |
627 | radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) { | |
628 | flow = *slot; | |
629 | wake_up_interruptible_all(&flow->resume_tx); | |
630 | } | |
631 | mutex_unlock(&node->qrtr_tx_lock); | |
632 | ||
bdabad3e CC |
633 | qrtr_node_release(node); |
634 | ep->node = NULL; | |
635 | } | |
636 | EXPORT_SYMBOL_GPL(qrtr_endpoint_unregister); | |
637 | ||
638 | /* Lookup socket by port. | |
639 | * | |
640 | * Callers must release with qrtr_port_put() | |
641 | */ | |
642 | static struct qrtr_sock *qrtr_port_lookup(int port) | |
643 | { | |
644 | struct qrtr_sock *ipc; | |
645 | ||
646 | if (port == QRTR_PORT_CTRL) | |
647 | port = 0; | |
648 | ||
649 | mutex_lock(&qrtr_port_lock); | |
650 | ipc = idr_find(&qrtr_ports, port); | |
651 | if (ipc) | |
652 | sock_hold(&ipc->sk); | |
653 | mutex_unlock(&qrtr_port_lock); | |
654 | ||
655 | return ipc; | |
656 | } | |
657 | ||
658 | /* Release acquired socket. */ | |
659 | static void qrtr_port_put(struct qrtr_sock *ipc) | |
660 | { | |
661 | sock_put(&ipc->sk); | |
662 | } | |
663 | ||
664 | /* Remove port assignment. */ | |
665 | static void qrtr_port_remove(struct qrtr_sock *ipc) | |
666 | { | |
1a7959c7 | 667 | struct qrtr_ctrl_pkt *pkt; |
1784473b | 668 | struct sk_buff *skb; |
bdabad3e | 669 | int port = ipc->us.sq_port; |
e7044482 BA |
670 | struct sockaddr_qrtr to; |
671 | ||
672 | to.sq_family = AF_QIPCRTR; | |
673 | to.sq_node = QRTR_NODE_BCAST; | |
674 | to.sq_port = QRTR_PORT_CTRL; | |
bdabad3e | 675 | |
1a7959c7 | 676 | skb = qrtr_alloc_ctrl_packet(&pkt); |
1784473b | 677 | if (skb) { |
1a7959c7 BA |
678 | pkt->cmd = cpu_to_le32(QRTR_TYPE_DEL_CLIENT); |
679 | pkt->client.node = cpu_to_le32(ipc->us.sq_node); | |
680 | pkt->client.port = cpu_to_le32(ipc->us.sq_port); | |
681 | ||
1784473b | 682 | skb_set_owner_w(skb, &ipc->sk); |
e7044482 BA |
683 | qrtr_bcast_enqueue(NULL, skb, QRTR_TYPE_DEL_CLIENT, &ipc->us, |
684 | &to); | |
1784473b BA |
685 | } |
686 | ||
bdabad3e CC |
687 | if (port == QRTR_PORT_CTRL) |
688 | port = 0; | |
689 | ||
690 | __sock_put(&ipc->sk); | |
691 | ||
692 | mutex_lock(&qrtr_port_lock); | |
693 | idr_remove(&qrtr_ports, port); | |
694 | mutex_unlock(&qrtr_port_lock); | |
695 | } | |
696 | ||
697 | /* Assign port number to socket. | |
698 | * | |
699 | * Specify port in the integer pointed to by port, and it will be adjusted | |
700 | * on return as necesssary. | |
701 | * | |
702 | * Port may be: | |
703 | * 0: Assign ephemeral port in [QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET] | |
704 | * <QRTR_MIN_EPH_SOCKET: Specified; requires CAP_NET_ADMIN | |
705 | * >QRTR_MIN_EPH_SOCKET: Specified; available to all | |
706 | */ | |
707 | static int qrtr_port_assign(struct qrtr_sock *ipc, int *port) | |
708 | { | |
709 | int rc; | |
710 | ||
711 | mutex_lock(&qrtr_port_lock); | |
712 | if (!*port) { | |
713 | rc = idr_alloc(&qrtr_ports, ipc, | |
714 | QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET + 1, | |
715 | GFP_ATOMIC); | |
716 | if (rc >= 0) | |
717 | *port = rc; | |
718 | } else if (*port < QRTR_MIN_EPH_SOCKET && !capable(CAP_NET_ADMIN)) { | |
719 | rc = -EACCES; | |
720 | } else if (*port == QRTR_PORT_CTRL) { | |
721 | rc = idr_alloc(&qrtr_ports, ipc, 0, 1, GFP_ATOMIC); | |
722 | } else { | |
723 | rc = idr_alloc(&qrtr_ports, ipc, *port, *port + 1, GFP_ATOMIC); | |
724 | if (rc >= 0) | |
725 | *port = rc; | |
726 | } | |
727 | mutex_unlock(&qrtr_port_lock); | |
728 | ||
729 | if (rc == -ENOSPC) | |
730 | return -EADDRINUSE; | |
731 | else if (rc < 0) | |
732 | return rc; | |
733 | ||
734 | sock_hold(&ipc->sk); | |
735 | ||
736 | return 0; | |
737 | } | |
738 | ||
b24844b1 BA |
739 | /* Reset all non-control ports */ |
740 | static void qrtr_reset_ports(void) | |
741 | { | |
742 | struct qrtr_sock *ipc; | |
743 | int id; | |
744 | ||
745 | mutex_lock(&qrtr_port_lock); | |
746 | idr_for_each_entry(&qrtr_ports, ipc, id) { | |
747 | /* Don't reset control port */ | |
748 | if (id == 0) | |
749 | continue; | |
750 | ||
751 | sock_hold(&ipc->sk); | |
752 | ipc->sk.sk_err = ENETRESET; | |
ae85bfa8 | 753 | ipc->sk.sk_error_report(&ipc->sk); |
b24844b1 BA |
754 | sock_put(&ipc->sk); |
755 | } | |
756 | mutex_unlock(&qrtr_port_lock); | |
757 | } | |
758 | ||
bdabad3e CC |
759 | /* Bind socket to address. |
760 | * | |
761 | * Socket should be locked upon call. | |
762 | */ | |
763 | static int __qrtr_bind(struct socket *sock, | |
764 | const struct sockaddr_qrtr *addr, int zapped) | |
765 | { | |
766 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
767 | struct sock *sk = sock->sk; | |
768 | int port; | |
769 | int rc; | |
770 | ||
771 | /* rebinding ok */ | |
772 | if (!zapped && addr->sq_port == ipc->us.sq_port) | |
773 | return 0; | |
774 | ||
775 | port = addr->sq_port; | |
776 | rc = qrtr_port_assign(ipc, &port); | |
777 | if (rc) | |
778 | return rc; | |
779 | ||
780 | /* unbind previous, if any */ | |
781 | if (!zapped) | |
782 | qrtr_port_remove(ipc); | |
783 | ipc->us.sq_port = port; | |
784 | ||
785 | sock_reset_flag(sk, SOCK_ZAPPED); | |
786 | ||
b24844b1 BA |
787 | /* Notify all open ports about the new controller */ |
788 | if (port == QRTR_PORT_CTRL) | |
789 | qrtr_reset_ports(); | |
790 | ||
bdabad3e CC |
791 | return 0; |
792 | } | |
793 | ||
794 | /* Auto bind to an ephemeral port. */ | |
795 | static int qrtr_autobind(struct socket *sock) | |
796 | { | |
797 | struct sock *sk = sock->sk; | |
798 | struct sockaddr_qrtr addr; | |
799 | ||
800 | if (!sock_flag(sk, SOCK_ZAPPED)) | |
801 | return 0; | |
802 | ||
803 | addr.sq_family = AF_QIPCRTR; | |
804 | addr.sq_node = qrtr_local_nid; | |
805 | addr.sq_port = 0; | |
806 | ||
807 | return __qrtr_bind(sock, &addr, 1); | |
808 | } | |
809 | ||
810 | /* Bind socket to specified sockaddr. */ | |
811 | static int qrtr_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
812 | { | |
813 | DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr); | |
814 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
815 | struct sock *sk = sock->sk; | |
816 | int rc; | |
817 | ||
818 | if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR) | |
819 | return -EINVAL; | |
820 | ||
821 | if (addr->sq_node != ipc->us.sq_node) | |
822 | return -EINVAL; | |
823 | ||
824 | lock_sock(sk); | |
825 | rc = __qrtr_bind(sock, addr, sock_flag(sk, SOCK_ZAPPED)); | |
826 | release_sock(sk); | |
827 | ||
828 | return rc; | |
829 | } | |
830 | ||
831 | /* Queue packet to local peer socket. */ | |
e7044482 BA |
832 | static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb, |
833 | int type, struct sockaddr_qrtr *from, | |
834 | struct sockaddr_qrtr *to) | |
bdabad3e | 835 | { |
bdabad3e | 836 | struct qrtr_sock *ipc; |
f507a9b6 | 837 | struct qrtr_cb *cb; |
bdabad3e | 838 | |
e7044482 | 839 | ipc = qrtr_port_lookup(to->sq_port); |
bdabad3e CC |
840 | if (!ipc || &ipc->sk == skb->sk) { /* do not send to self */ |
841 | kfree_skb(skb); | |
842 | return -ENODEV; | |
843 | } | |
844 | ||
f507a9b6 BA |
845 | cb = (struct qrtr_cb *)skb->cb; |
846 | cb->src_node = from->sq_node; | |
847 | cb->src_port = from->sq_port; | |
e7044482 | 848 | |
bdabad3e CC |
849 | if (sock_queue_rcv_skb(&ipc->sk, skb)) { |
850 | qrtr_port_put(ipc); | |
851 | kfree_skb(skb); | |
852 | return -ENOSPC; | |
853 | } | |
854 | ||
855 | qrtr_port_put(ipc); | |
856 | ||
857 | return 0; | |
858 | } | |
859 | ||
860 | /* Queue packet for broadcast. */ | |
e7044482 BA |
861 | static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb, |
862 | int type, struct sockaddr_qrtr *from, | |
863 | struct sockaddr_qrtr *to) | |
bdabad3e CC |
864 | { |
865 | struct sk_buff *skbn; | |
866 | ||
867 | mutex_lock(&qrtr_node_lock); | |
868 | list_for_each_entry(node, &qrtr_all_nodes, item) { | |
869 | skbn = skb_clone(skb, GFP_KERNEL); | |
870 | if (!skbn) | |
871 | break; | |
872 | skb_set_owner_w(skbn, skb->sk); | |
e7044482 | 873 | qrtr_node_enqueue(node, skbn, type, from, to); |
bdabad3e CC |
874 | } |
875 | mutex_unlock(&qrtr_node_lock); | |
876 | ||
e7044482 | 877 | qrtr_local_enqueue(node, skb, type, from, to); |
bdabad3e CC |
878 | |
879 | return 0; | |
880 | } | |
881 | ||
882 | static int qrtr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) | |
883 | { | |
884 | DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name); | |
e7044482 BA |
885 | int (*enqueue_fn)(struct qrtr_node *, struct sk_buff *, int, |
886 | struct sockaddr_qrtr *, struct sockaddr_qrtr *); | |
8f5e2451 | 887 | __le32 qrtr_type = cpu_to_le32(QRTR_TYPE_DATA); |
bdabad3e CC |
888 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); |
889 | struct sock *sk = sock->sk; | |
890 | struct qrtr_node *node; | |
bdabad3e CC |
891 | struct sk_buff *skb; |
892 | size_t plen; | |
7036e621 | 893 | u32 type; |
bdabad3e CC |
894 | int rc; |
895 | ||
896 | if (msg->msg_flags & ~(MSG_DONTWAIT)) | |
897 | return -EINVAL; | |
898 | ||
899 | if (len > 65535) | |
900 | return -EMSGSIZE; | |
901 | ||
902 | lock_sock(sk); | |
903 | ||
904 | if (addr) { | |
905 | if (msg->msg_namelen < sizeof(*addr)) { | |
906 | release_sock(sk); | |
907 | return -EINVAL; | |
908 | } | |
909 | ||
910 | if (addr->sq_family != AF_QIPCRTR) { | |
911 | release_sock(sk); | |
912 | return -EINVAL; | |
913 | } | |
914 | ||
915 | rc = qrtr_autobind(sock); | |
916 | if (rc) { | |
917 | release_sock(sk); | |
918 | return rc; | |
919 | } | |
920 | } else if (sk->sk_state == TCP_ESTABLISHED) { | |
921 | addr = &ipc->peer; | |
922 | } else { | |
923 | release_sock(sk); | |
924 | return -ENOTCONN; | |
925 | } | |
926 | ||
927 | node = NULL; | |
928 | if (addr->sq_node == QRTR_NODE_BCAST) { | |
929 | enqueue_fn = qrtr_bcast_enqueue; | |
fdf5fd39 AKN |
930 | if (addr->sq_port != QRTR_PORT_CTRL) { |
931 | release_sock(sk); | |
932 | return -ENOTCONN; | |
933 | } | |
bdabad3e CC |
934 | } else if (addr->sq_node == ipc->us.sq_node) { |
935 | enqueue_fn = qrtr_local_enqueue; | |
936 | } else { | |
937 | enqueue_fn = qrtr_node_enqueue; | |
938 | node = qrtr_node_lookup(addr->sq_node); | |
939 | if (!node) { | |
940 | release_sock(sk); | |
941 | return -ECONNRESET; | |
942 | } | |
943 | } | |
944 | ||
945 | plen = (len + 3) & ~3; | |
194ccc88 | 946 | skb = sock_alloc_send_skb(sk, plen + QRTR_HDR_MAX_SIZE, |
bdabad3e CC |
947 | msg->msg_flags & MSG_DONTWAIT, &rc); |
948 | if (!skb) | |
949 | goto out_node; | |
950 | ||
194ccc88 | 951 | skb_reserve(skb, QRTR_HDR_MAX_SIZE); |
bdabad3e | 952 | |
e7044482 | 953 | rc = memcpy_from_msg(skb_put(skb, len), msg, len); |
bdabad3e CC |
954 | if (rc) { |
955 | kfree_skb(skb); | |
956 | goto out_node; | |
957 | } | |
958 | ||
bdabad3e CC |
959 | if (ipc->us.sq_port == QRTR_PORT_CTRL) { |
960 | if (len < 4) { | |
961 | rc = -EINVAL; | |
962 | kfree_skb(skb); | |
963 | goto out_node; | |
964 | } | |
965 | ||
966 | /* control messages already require the type as 'command' */ | |
8f5e2451 | 967 | skb_copy_bits(skb, 0, &qrtr_type, 4); |
bdabad3e CC |
968 | } |
969 | ||
7036e621 | 970 | type = le32_to_cpu(qrtr_type); |
e7044482 | 971 | rc = enqueue_fn(node, skb, type, &ipc->us, addr); |
bdabad3e CC |
972 | if (rc >= 0) |
973 | rc = len; | |
974 | ||
975 | out_node: | |
976 | qrtr_node_release(node); | |
977 | release_sock(sk); | |
978 | ||
979 | return rc; | |
980 | } | |
981 | ||
cb6530b9 BA |
982 | static int qrtr_send_resume_tx(struct qrtr_cb *cb) |
983 | { | |
984 | struct sockaddr_qrtr remote = { AF_QIPCRTR, cb->src_node, cb->src_port }; | |
985 | struct sockaddr_qrtr local = { AF_QIPCRTR, cb->dst_node, cb->dst_port }; | |
986 | struct qrtr_ctrl_pkt *pkt; | |
987 | struct qrtr_node *node; | |
988 | struct sk_buff *skb; | |
989 | int ret; | |
990 | ||
991 | node = qrtr_node_lookup(remote.sq_node); | |
992 | if (!node) | |
993 | return -EINVAL; | |
994 | ||
995 | skb = qrtr_alloc_ctrl_packet(&pkt); | |
996 | if (!skb) | |
997 | return -ENOMEM; | |
998 | ||
999 | pkt->cmd = cpu_to_le32(QRTR_TYPE_RESUME_TX); | |
1000 | pkt->client.node = cpu_to_le32(cb->dst_node); | |
1001 | pkt->client.port = cpu_to_le32(cb->dst_port); | |
1002 | ||
1003 | ret = qrtr_node_enqueue(node, skb, QRTR_TYPE_RESUME_TX, &local, &remote); | |
1004 | ||
1005 | qrtr_node_release(node); | |
1006 | ||
1007 | return ret; | |
1008 | } | |
1009 | ||
bdabad3e CC |
1010 | static int qrtr_recvmsg(struct socket *sock, struct msghdr *msg, |
1011 | size_t size, int flags) | |
1012 | { | |
1013 | DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name); | |
bdabad3e CC |
1014 | struct sock *sk = sock->sk; |
1015 | struct sk_buff *skb; | |
f507a9b6 | 1016 | struct qrtr_cb *cb; |
bdabad3e CC |
1017 | int copied, rc; |
1018 | ||
1019 | lock_sock(sk); | |
1020 | ||
1021 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
1022 | release_sock(sk); | |
1023 | return -EADDRNOTAVAIL; | |
1024 | } | |
1025 | ||
1026 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
1027 | flags & MSG_DONTWAIT, &rc); | |
1028 | if (!skb) { | |
1029 | release_sock(sk); | |
1030 | return rc; | |
1031 | } | |
cb6530b9 | 1032 | cb = (struct qrtr_cb *)skb->cb; |
bdabad3e | 1033 | |
f507a9b6 | 1034 | copied = skb->len; |
bdabad3e CC |
1035 | if (copied > size) { |
1036 | copied = size; | |
1037 | msg->msg_flags |= MSG_TRUNC; | |
1038 | } | |
1039 | ||
f507a9b6 | 1040 | rc = skb_copy_datagram_msg(skb, 0, msg, copied); |
bdabad3e CC |
1041 | if (rc < 0) |
1042 | goto out; | |
1043 | rc = copied; | |
1044 | ||
1045 | if (addr) { | |
1046 | addr->sq_family = AF_QIPCRTR; | |
f507a9b6 BA |
1047 | addr->sq_node = cb->src_node; |
1048 | addr->sq_port = cb->src_port; | |
bdabad3e CC |
1049 | msg->msg_namelen = sizeof(*addr); |
1050 | } | |
1051 | ||
1052 | out: | |
cb6530b9 BA |
1053 | if (cb->confirm_rx) |
1054 | qrtr_send_resume_tx(cb); | |
1055 | ||
bdabad3e CC |
1056 | skb_free_datagram(sk, skb); |
1057 | release_sock(sk); | |
1058 | ||
1059 | return rc; | |
1060 | } | |
1061 | ||
1062 | static int qrtr_connect(struct socket *sock, struct sockaddr *saddr, | |
1063 | int len, int flags) | |
1064 | { | |
1065 | DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr); | |
1066 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
1067 | struct sock *sk = sock->sk; | |
1068 | int rc; | |
1069 | ||
1070 | if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR) | |
1071 | return -EINVAL; | |
1072 | ||
1073 | lock_sock(sk); | |
1074 | ||
1075 | sk->sk_state = TCP_CLOSE; | |
1076 | sock->state = SS_UNCONNECTED; | |
1077 | ||
1078 | rc = qrtr_autobind(sock); | |
1079 | if (rc) { | |
1080 | release_sock(sk); | |
1081 | return rc; | |
1082 | } | |
1083 | ||
1084 | ipc->peer = *addr; | |
1085 | sock->state = SS_CONNECTED; | |
1086 | sk->sk_state = TCP_ESTABLISHED; | |
1087 | ||
1088 | release_sock(sk); | |
1089 | ||
1090 | return 0; | |
1091 | } | |
1092 | ||
1093 | static int qrtr_getname(struct socket *sock, struct sockaddr *saddr, | |
9b2c45d4 | 1094 | int peer) |
bdabad3e CC |
1095 | { |
1096 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
1097 | struct sockaddr_qrtr qaddr; | |
1098 | struct sock *sk = sock->sk; | |
1099 | ||
1100 | lock_sock(sk); | |
1101 | if (peer) { | |
1102 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1103 | release_sock(sk); | |
1104 | return -ENOTCONN; | |
1105 | } | |
1106 | ||
1107 | qaddr = ipc->peer; | |
1108 | } else { | |
1109 | qaddr = ipc->us; | |
1110 | } | |
1111 | release_sock(sk); | |
1112 | ||
bdabad3e CC |
1113 | qaddr.sq_family = AF_QIPCRTR; |
1114 | ||
1115 | memcpy(saddr, &qaddr, sizeof(qaddr)); | |
1116 | ||
9b2c45d4 | 1117 | return sizeof(qaddr); |
bdabad3e CC |
1118 | } |
1119 | ||
1120 | static int qrtr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1121 | { | |
1122 | void __user *argp = (void __user *)arg; | |
1123 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
1124 | struct sock *sk = sock->sk; | |
1125 | struct sockaddr_qrtr *sq; | |
1126 | struct sk_buff *skb; | |
1127 | struct ifreq ifr; | |
1128 | long len = 0; | |
1129 | int rc = 0; | |
1130 | ||
1131 | lock_sock(sk); | |
1132 | ||
1133 | switch (cmd) { | |
1134 | case TIOCOUTQ: | |
1135 | len = sk->sk_sndbuf - sk_wmem_alloc_get(sk); | |
1136 | if (len < 0) | |
1137 | len = 0; | |
1138 | rc = put_user(len, (int __user *)argp); | |
1139 | break; | |
1140 | case TIOCINQ: | |
1141 | skb = skb_peek(&sk->sk_receive_queue); | |
1142 | if (skb) | |
f507a9b6 | 1143 | len = skb->len; |
bdabad3e CC |
1144 | rc = put_user(len, (int __user *)argp); |
1145 | break; | |
1146 | case SIOCGIFADDR: | |
1147 | if (copy_from_user(&ifr, argp, sizeof(ifr))) { | |
1148 | rc = -EFAULT; | |
1149 | break; | |
1150 | } | |
1151 | ||
1152 | sq = (struct sockaddr_qrtr *)&ifr.ifr_addr; | |
1153 | *sq = ipc->us; | |
1154 | if (copy_to_user(argp, &ifr, sizeof(ifr))) { | |
1155 | rc = -EFAULT; | |
1156 | break; | |
1157 | } | |
1158 | break; | |
bdabad3e CC |
1159 | case SIOCADDRT: |
1160 | case SIOCDELRT: | |
1161 | case SIOCSIFADDR: | |
1162 | case SIOCGIFDSTADDR: | |
1163 | case SIOCSIFDSTADDR: | |
1164 | case SIOCGIFBRDADDR: | |
1165 | case SIOCSIFBRDADDR: | |
1166 | case SIOCGIFNETMASK: | |
1167 | case SIOCSIFNETMASK: | |
1168 | rc = -EINVAL; | |
1169 | break; | |
1170 | default: | |
1171 | rc = -ENOIOCTLCMD; | |
1172 | break; | |
1173 | } | |
1174 | ||
1175 | release_sock(sk); | |
1176 | ||
1177 | return rc; | |
1178 | } | |
1179 | ||
1180 | static int qrtr_release(struct socket *sock) | |
1181 | { | |
1182 | struct sock *sk = sock->sk; | |
1183 | struct qrtr_sock *ipc; | |
1184 | ||
1185 | if (!sk) | |
1186 | return 0; | |
1187 | ||
1188 | lock_sock(sk); | |
1189 | ||
1190 | ipc = qrtr_sk(sk); | |
1191 | sk->sk_shutdown = SHUTDOWN_MASK; | |
1192 | if (!sock_flag(sk, SOCK_DEAD)) | |
1193 | sk->sk_state_change(sk); | |
1194 | ||
1195 | sock_set_flag(sk, SOCK_DEAD); | |
1196 | sock->sk = NULL; | |
1197 | ||
1198 | if (!sock_flag(sk, SOCK_ZAPPED)) | |
1199 | qrtr_port_remove(ipc); | |
1200 | ||
1201 | skb_queue_purge(&sk->sk_receive_queue); | |
1202 | ||
1203 | release_sock(sk); | |
1204 | sock_put(sk); | |
1205 | ||
1206 | return 0; | |
1207 | } | |
1208 | ||
1209 | static const struct proto_ops qrtr_proto_ops = { | |
1210 | .owner = THIS_MODULE, | |
1211 | .family = AF_QIPCRTR, | |
1212 | .bind = qrtr_bind, | |
1213 | .connect = qrtr_connect, | |
1214 | .socketpair = sock_no_socketpair, | |
1215 | .accept = sock_no_accept, | |
1216 | .listen = sock_no_listen, | |
1217 | .sendmsg = qrtr_sendmsg, | |
1218 | .recvmsg = qrtr_recvmsg, | |
1219 | .getname = qrtr_getname, | |
1220 | .ioctl = qrtr_ioctl, | |
c7cbdbf2 | 1221 | .gettstamp = sock_gettstamp, |
a11e1d43 | 1222 | .poll = datagram_poll, |
bdabad3e CC |
1223 | .shutdown = sock_no_shutdown, |
1224 | .setsockopt = sock_no_setsockopt, | |
1225 | .getsockopt = sock_no_getsockopt, | |
1226 | .release = qrtr_release, | |
1227 | .mmap = sock_no_mmap, | |
1228 | .sendpage = sock_no_sendpage, | |
1229 | }; | |
1230 | ||
1231 | static struct proto qrtr_proto = { | |
1232 | .name = "QIPCRTR", | |
1233 | .owner = THIS_MODULE, | |
1234 | .obj_size = sizeof(struct qrtr_sock), | |
1235 | }; | |
1236 | ||
1237 | static int qrtr_create(struct net *net, struct socket *sock, | |
1238 | int protocol, int kern) | |
1239 | { | |
1240 | struct qrtr_sock *ipc; | |
1241 | struct sock *sk; | |
1242 | ||
1243 | if (sock->type != SOCK_DGRAM) | |
1244 | return -EPROTOTYPE; | |
1245 | ||
1246 | sk = sk_alloc(net, AF_QIPCRTR, GFP_KERNEL, &qrtr_proto, kern); | |
1247 | if (!sk) | |
1248 | return -ENOMEM; | |
1249 | ||
1250 | sock_set_flag(sk, SOCK_ZAPPED); | |
1251 | ||
1252 | sock_init_data(sock, sk); | |
1253 | sock->ops = &qrtr_proto_ops; | |
1254 | ||
1255 | ipc = qrtr_sk(sk); | |
1256 | ipc->us.sq_family = AF_QIPCRTR; | |
1257 | ipc->us.sq_node = qrtr_local_nid; | |
1258 | ipc->us.sq_port = 0; | |
1259 | ||
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | static const struct nla_policy qrtr_policy[IFA_MAX + 1] = { | |
1264 | [IFA_LOCAL] = { .type = NLA_U32 }, | |
1265 | }; | |
1266 | ||
c21ef3e3 DA |
1267 | static int qrtr_addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh, |
1268 | struct netlink_ext_ack *extack) | |
bdabad3e CC |
1269 | { |
1270 | struct nlattr *tb[IFA_MAX + 1]; | |
1271 | struct ifaddrmsg *ifm; | |
1272 | int rc; | |
1273 | ||
1274 | if (!netlink_capable(skb, CAP_NET_ADMIN)) | |
1275 | return -EPERM; | |
1276 | ||
1277 | if (!netlink_capable(skb, CAP_SYS_ADMIN)) | |
1278 | return -EPERM; | |
1279 | ||
1280 | ASSERT_RTNL(); | |
1281 | ||
8cb08174 JB |
1282 | rc = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, |
1283 | qrtr_policy, extack); | |
bdabad3e CC |
1284 | if (rc < 0) |
1285 | return rc; | |
1286 | ||
1287 | ifm = nlmsg_data(nlh); | |
1288 | if (!tb[IFA_LOCAL]) | |
1289 | return -EINVAL; | |
1290 | ||
1291 | qrtr_local_nid = nla_get_u32(tb[IFA_LOCAL]); | |
1292 | return 0; | |
1293 | } | |
1294 | ||
1295 | static const struct net_proto_family qrtr_family = { | |
1296 | .owner = THIS_MODULE, | |
1297 | .family = AF_QIPCRTR, | |
1298 | .create = qrtr_create, | |
1299 | }; | |
1300 | ||
1301 | static int __init qrtr_proto_init(void) | |
1302 | { | |
1303 | int rc; | |
1304 | ||
1305 | rc = proto_register(&qrtr_proto, 1); | |
1306 | if (rc) | |
1307 | return rc; | |
1308 | ||
1309 | rc = sock_register(&qrtr_family); | |
1310 | if (rc) { | |
1311 | proto_unregister(&qrtr_proto); | |
1312 | return rc; | |
1313 | } | |
1314 | ||
c1c502b5 FW |
1315 | rc = rtnl_register_module(THIS_MODULE, PF_QIPCRTR, RTM_NEWADDR, qrtr_addr_doit, NULL, 0); |
1316 | if (rc) { | |
1317 | sock_unregister(qrtr_family.family); | |
1318 | proto_unregister(&qrtr_proto); | |
1319 | } | |
bdabad3e | 1320 | |
c1c502b5 | 1321 | return rc; |
bdabad3e | 1322 | } |
b7e732fa | 1323 | postcore_initcall(qrtr_proto_init); |
bdabad3e CC |
1324 | |
1325 | static void __exit qrtr_proto_fini(void) | |
1326 | { | |
1327 | rtnl_unregister(PF_QIPCRTR, RTM_NEWADDR); | |
1328 | sock_unregister(qrtr_family.family); | |
1329 | proto_unregister(&qrtr_proto); | |
1330 | } | |
1331 | module_exit(qrtr_proto_fini); | |
1332 | ||
1333 | MODULE_DESCRIPTION("Qualcomm IPC-router driver"); | |
1334 | MODULE_LICENSE("GPL v2"); | |
77ac725e | 1335 | MODULE_ALIAS_NETPROTO(PF_QIPCRTR); |