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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 */ | |
0a7e0d0e | 10 | #include <linux/spinlock.h> |
5fdeb0d3 | 11 | #include <linux/wait.h> |
bdabad3e CC |
12 | |
13 | #include <net/sock.h> | |
14 | ||
15 | #include "qrtr.h" | |
16 | ||
194ccc88 BA |
17 | #define QRTR_PROTO_VER_1 1 |
18 | #define QRTR_PROTO_VER_2 3 | |
bdabad3e CC |
19 | |
20 | /* auto-bind range */ | |
21 | #define QRTR_MIN_EPH_SOCKET 0x4000 | |
22 | #define QRTR_MAX_EPH_SOCKET 0x7fff | |
23 | ||
bdabad3e | 24 | /** |
194ccc88 | 25 | * struct qrtr_hdr_v1 - (I|R)PCrouter packet header version 1 |
bdabad3e CC |
26 | * @version: protocol version |
27 | * @type: packet type; one of QRTR_TYPE_* | |
28 | * @src_node_id: source node | |
29 | * @src_port_id: source port | |
30 | * @confirm_rx: boolean; whether a resume-tx packet should be send in reply | |
31 | * @size: length of packet, excluding this header | |
32 | * @dst_node_id: destination node | |
33 | * @dst_port_id: destination port | |
34 | */ | |
194ccc88 | 35 | struct qrtr_hdr_v1 { |
bdabad3e CC |
36 | __le32 version; |
37 | __le32 type; | |
38 | __le32 src_node_id; | |
39 | __le32 src_port_id; | |
40 | __le32 confirm_rx; | |
41 | __le32 size; | |
42 | __le32 dst_node_id; | |
43 | __le32 dst_port_id; | |
44 | } __packed; | |
45 | ||
194ccc88 BA |
46 | /** |
47 | * struct qrtr_hdr_v2 - (I|R)PCrouter packet header later versions | |
48 | * @version: protocol version | |
49 | * @type: packet type; one of QRTR_TYPE_* | |
50 | * @flags: bitmask of QRTR_FLAGS_* | |
51 | * @optlen: length of optional header data | |
52 | * @size: length of packet, excluding this header and optlen | |
53 | * @src_node_id: source node | |
54 | * @src_port_id: source port | |
55 | * @dst_node_id: destination node | |
56 | * @dst_port_id: destination port | |
57 | */ | |
58 | struct qrtr_hdr_v2 { | |
59 | u8 version; | |
60 | u8 type; | |
61 | u8 flags; | |
62 | u8 optlen; | |
63 | __le32 size; | |
64 | __le16 src_node_id; | |
65 | __le16 src_port_id; | |
66 | __le16 dst_node_id; | |
67 | __le16 dst_port_id; | |
68 | }; | |
69 | ||
70 | #define QRTR_FLAGS_CONFIRM_RX BIT(0) | |
71 | ||
f507a9b6 BA |
72 | struct qrtr_cb { |
73 | u32 src_node; | |
74 | u32 src_port; | |
75 | u32 dst_node; | |
76 | u32 dst_port; | |
77 | ||
78 | u8 type; | |
79 | u8 confirm_rx; | |
80 | }; | |
81 | ||
194ccc88 BA |
82 | #define QRTR_HDR_MAX_SIZE max_t(size_t, sizeof(struct qrtr_hdr_v1), \ |
83 | sizeof(struct qrtr_hdr_v2)) | |
bdabad3e CC |
84 | |
85 | struct qrtr_sock { | |
86 | /* WARNING: sk must be the first member */ | |
87 | struct sock sk; | |
88 | struct sockaddr_qrtr us; | |
89 | struct sockaddr_qrtr peer; | |
90 | }; | |
91 | ||
92 | static inline struct qrtr_sock *qrtr_sk(struct sock *sk) | |
93 | { | |
94 | BUILD_BUG_ON(offsetof(struct qrtr_sock, sk) != 0); | |
95 | return container_of(sk, struct qrtr_sock, sk); | |
96 | } | |
97 | ||
31d6cbee | 98 | static unsigned int qrtr_local_nid = 1; |
bdabad3e CC |
99 | |
100 | /* for node ids */ | |
0a7e0d0e BA |
101 | static RADIX_TREE(qrtr_nodes, GFP_ATOMIC); |
102 | static DEFINE_SPINLOCK(qrtr_nodes_lock); | |
bdabad3e CC |
103 | /* broadcast list */ |
104 | static LIST_HEAD(qrtr_all_nodes); | |
0a7e0d0e | 105 | /* lock for qrtr_all_nodes and node reference */ |
bdabad3e CC |
106 | static DEFINE_MUTEX(qrtr_node_lock); |
107 | ||
108 | /* local port allocation management */ | |
109 | static DEFINE_IDR(qrtr_ports); | |
110 | static DEFINE_MUTEX(qrtr_port_lock); | |
111 | ||
112 | /** | |
113 | * struct qrtr_node - endpoint node | |
114 | * @ep_lock: lock for endpoint management and callbacks | |
115 | * @ep: endpoint | |
116 | * @ref: reference count for node | |
117 | * @nid: node id | |
5fdeb0d3 BA |
118 | * @qrtr_tx_flow: tree of qrtr_tx_flow, keyed by node << 32 | port |
119 | * @qrtr_tx_lock: lock for qrtr_tx_flow inserts | |
bdabad3e | 120 | * @rx_queue: receive queue |
bdabad3e CC |
121 | * @item: list item for broadcast list |
122 | */ | |
123 | struct qrtr_node { | |
124 | struct mutex ep_lock; | |
125 | struct qrtr_endpoint *ep; | |
126 | struct kref ref; | |
127 | unsigned int nid; | |
128 | ||
5fdeb0d3 BA |
129 | struct radix_tree_root qrtr_tx_flow; |
130 | struct mutex qrtr_tx_lock; /* for qrtr_tx_flow */ | |
131 | ||
bdabad3e | 132 | struct sk_buff_head rx_queue; |
bdabad3e CC |
133 | struct list_head item; |
134 | }; | |
135 | ||
5fdeb0d3 BA |
136 | /** |
137 | * struct qrtr_tx_flow - tx flow control | |
138 | * @resume_tx: waiters for a resume tx from the remote | |
139 | * @pending: number of waiting senders | |
140 | * @tx_failed: indicates that a message with confirm_rx flag was lost | |
141 | */ | |
142 | struct qrtr_tx_flow { | |
143 | struct wait_queue_head resume_tx; | |
144 | int pending; | |
145 | int tx_failed; | |
146 | }; | |
147 | ||
148 | #define QRTR_TX_FLOW_HIGH 10 | |
149 | #define QRTR_TX_FLOW_LOW 5 | |
150 | ||
e7044482 BA |
151 | static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb, |
152 | int type, struct sockaddr_qrtr *from, | |
153 | struct sockaddr_qrtr *to); | |
154 | static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb, | |
155 | int type, struct sockaddr_qrtr *from, | |
156 | struct sockaddr_qrtr *to); | |
e04df98a BA |
157 | static struct qrtr_sock *qrtr_port_lookup(int port); |
158 | static void qrtr_port_put(struct qrtr_sock *ipc); | |
8acc8ee4 | 159 | |
bdabad3e CC |
160 | /* Release node resources and free the node. |
161 | * | |
162 | * Do not call directly, use qrtr_node_release. To be used with | |
163 | * kref_put_mutex. As such, the node mutex is expected to be locked on call. | |
164 | */ | |
165 | static void __qrtr_node_release(struct kref *kref) | |
166 | { | |
167 | struct qrtr_node *node = container_of(kref, struct qrtr_node, ref); | |
5fdeb0d3 | 168 | struct radix_tree_iter iter; |
28541f3d | 169 | struct qrtr_tx_flow *flow; |
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 | ||
181 | skb_queue_purge(&node->rx_queue); | |
5fdeb0d3 BA |
182 | |
183 | /* Free tx flow counters */ | |
184 | radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) { | |
28541f3d | 185 | flow = *slot; |
5fdeb0d3 | 186 | radix_tree_iter_delete(&node->qrtr_tx_flow, &iter, slot); |
28541f3d | 187 | kfree(flow); |
5fdeb0d3 | 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; | |
e04df98a | 425 | struct qrtr_sock *ipc; |
bdabad3e | 426 | struct sk_buff *skb; |
f507a9b6 | 427 | struct qrtr_cb *cb; |
bdabad3e | 428 | unsigned int size; |
bdabad3e | 429 | unsigned int ver; |
194ccc88 | 430 | size_t hdrlen; |
bdabad3e | 431 | |
8ff41cc2 | 432 | if (len == 0 || len & 3) |
bdabad3e CC |
433 | return -EINVAL; |
434 | ||
435 | skb = netdev_alloc_skb(NULL, len); | |
436 | if (!skb) | |
437 | return -ENOMEM; | |
438 | ||
f507a9b6 | 439 | cb = (struct qrtr_cb *)skb->cb; |
f507a9b6 | 440 | |
194ccc88 BA |
441 | /* Version field in v1 is little endian, so this works for both cases */ |
442 | ver = *(u8*)data; | |
443 | ||
444 | switch (ver) { | |
445 | case QRTR_PROTO_VER_1: | |
8ff41cc2 DC |
446 | if (len < sizeof(*v1)) |
447 | goto err; | |
194ccc88 BA |
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: | |
8ff41cc2 DC |
461 | if (len < sizeof(*v2)) |
462 | goto err; | |
194ccc88 BA |
463 | v2 = data; |
464 | hdrlen = sizeof(*v2) + v2->optlen; | |
465 | ||
466 | cb->type = v2->type; | |
467 | cb->confirm_rx = !!(v2->flags & QRTR_FLAGS_CONFIRM_RX); | |
468 | cb->src_node = le16_to_cpu(v2->src_node_id); | |
469 | cb->src_port = le16_to_cpu(v2->src_port_id); | |
470 | cb->dst_node = le16_to_cpu(v2->dst_node_id); | |
471 | cb->dst_port = le16_to_cpu(v2->dst_port_id); | |
472 | ||
473 | if (cb->src_port == (u16)QRTR_PORT_CTRL) | |
474 | cb->src_port = QRTR_PORT_CTRL; | |
475 | if (cb->dst_port == (u16)QRTR_PORT_CTRL) | |
476 | cb->dst_port = QRTR_PORT_CTRL; | |
477 | ||
478 | size = le32_to_cpu(v2->size); | |
479 | break; | |
480 | default: | |
481 | pr_err("qrtr: Invalid version %d\n", ver); | |
482 | goto err; | |
483 | } | |
484 | ||
485 | if (len != ALIGN(size, 4) + hdrlen) | |
486 | goto err; | |
487 | ||
5fdeb0d3 BA |
488 | if (cb->dst_port != QRTR_PORT_CTRL && cb->type != QRTR_TYPE_DATA && |
489 | cb->type != QRTR_TYPE_RESUME_TX) | |
194ccc88 BA |
490 | goto err; |
491 | ||
492 | skb_put_data(skb, data + hdrlen, size); | |
bdabad3e | 493 | |
e04df98a BA |
494 | qrtr_node_assign(node, cb->src_node); |
495 | ||
496 | if (cb->type == QRTR_TYPE_RESUME_TX) { | |
497 | qrtr_tx_resume(node, skb); | |
498 | } else { | |
499 | ipc = qrtr_port_lookup(cb->dst_port); | |
500 | if (!ipc) | |
501 | goto err; | |
502 | ||
503 | if (sock_queue_rcv_skb(&ipc->sk, skb)) | |
504 | goto err; | |
505 | ||
506 | qrtr_port_put(ipc); | |
507 | } | |
bdabad3e CC |
508 | |
509 | return 0; | |
194ccc88 BA |
510 | |
511 | err: | |
512 | kfree_skb(skb); | |
513 | return -EINVAL; | |
514 | ||
bdabad3e CC |
515 | } |
516 | EXPORT_SYMBOL_GPL(qrtr_endpoint_post); | |
517 | ||
1a7959c7 BA |
518 | /** |
519 | * qrtr_alloc_ctrl_packet() - allocate control packet skb | |
520 | * @pkt: reference to qrtr_ctrl_pkt pointer | |
521 | * | |
522 | * Returns newly allocated sk_buff, or NULL on failure | |
523 | * | |
524 | * This function allocates a sk_buff large enough to carry a qrtr_ctrl_pkt and | |
525 | * on success returns a reference to the control packet in @pkt. | |
526 | */ | |
527 | static struct sk_buff *qrtr_alloc_ctrl_packet(struct qrtr_ctrl_pkt **pkt) | |
bdabad3e | 528 | { |
1a7959c7 | 529 | const int pkt_len = sizeof(struct qrtr_ctrl_pkt); |
bdabad3e | 530 | struct sk_buff *skb; |
bdabad3e | 531 | |
194ccc88 | 532 | skb = alloc_skb(QRTR_HDR_MAX_SIZE + pkt_len, GFP_KERNEL); |
bdabad3e CC |
533 | if (!skb) |
534 | return NULL; | |
bdabad3e | 535 | |
194ccc88 | 536 | skb_reserve(skb, QRTR_HDR_MAX_SIZE); |
1a7959c7 | 537 | *pkt = skb_put_zero(skb, pkt_len); |
1784473b BA |
538 | |
539 | return skb; | |
540 | } | |
541 | ||
bdabad3e CC |
542 | /** |
543 | * qrtr_endpoint_register() - register a new endpoint | |
544 | * @ep: endpoint to register | |
545 | * @nid: desired node id; may be QRTR_EP_NID_AUTO for auto-assignment | |
546 | * Return: 0 on success; negative error code on failure | |
547 | * | |
548 | * The specified endpoint must have the xmit function pointer set on call. | |
549 | */ | |
550 | int qrtr_endpoint_register(struct qrtr_endpoint *ep, unsigned int nid) | |
551 | { | |
552 | struct qrtr_node *node; | |
553 | ||
554 | if (!ep || !ep->xmit) | |
555 | return -EINVAL; | |
556 | ||
557 | node = kzalloc(sizeof(*node), GFP_KERNEL); | |
558 | if (!node) | |
559 | return -ENOMEM; | |
560 | ||
bdabad3e CC |
561 | kref_init(&node->ref); |
562 | mutex_init(&node->ep_lock); | |
563 | skb_queue_head_init(&node->rx_queue); | |
564 | node->nid = QRTR_EP_NID_AUTO; | |
565 | node->ep = ep; | |
566 | ||
5fdeb0d3 BA |
567 | INIT_RADIX_TREE(&node->qrtr_tx_flow, GFP_KERNEL); |
568 | mutex_init(&node->qrtr_tx_lock); | |
569 | ||
bdabad3e CC |
570 | qrtr_node_assign(node, nid); |
571 | ||
572 | mutex_lock(&qrtr_node_lock); | |
573 | list_add(&node->item, &qrtr_all_nodes); | |
574 | mutex_unlock(&qrtr_node_lock); | |
575 | ep->node = node; | |
576 | ||
577 | return 0; | |
578 | } | |
579 | EXPORT_SYMBOL_GPL(qrtr_endpoint_register); | |
580 | ||
581 | /** | |
582 | * qrtr_endpoint_unregister - unregister endpoint | |
583 | * @ep: endpoint to unregister | |
584 | */ | |
585 | void qrtr_endpoint_unregister(struct qrtr_endpoint *ep) | |
586 | { | |
587 | struct qrtr_node *node = ep->node; | |
e7044482 BA |
588 | struct sockaddr_qrtr src = {AF_QIPCRTR, node->nid, QRTR_PORT_CTRL}; |
589 | struct sockaddr_qrtr dst = {AF_QIPCRTR, qrtr_local_nid, QRTR_PORT_CTRL}; | |
5fdeb0d3 | 590 | struct radix_tree_iter iter; |
1a7959c7 | 591 | struct qrtr_ctrl_pkt *pkt; |
5fdeb0d3 | 592 | struct qrtr_tx_flow *flow; |
8acc8ee4 | 593 | struct sk_buff *skb; |
5fdeb0d3 | 594 | void __rcu **slot; |
bdabad3e CC |
595 | |
596 | mutex_lock(&node->ep_lock); | |
597 | node->ep = NULL; | |
598 | mutex_unlock(&node->ep_lock); | |
599 | ||
8acc8ee4 | 600 | /* Notify the local controller about the event */ |
1a7959c7 BA |
601 | skb = qrtr_alloc_ctrl_packet(&pkt); |
602 | if (skb) { | |
603 | pkt->cmd = cpu_to_le32(QRTR_TYPE_BYE); | |
e7044482 | 604 | qrtr_local_enqueue(NULL, skb, QRTR_TYPE_BYE, &src, &dst); |
1a7959c7 | 605 | } |
8acc8ee4 | 606 | |
5fdeb0d3 BA |
607 | /* Wake up any transmitters waiting for resume-tx from the node */ |
608 | mutex_lock(&node->qrtr_tx_lock); | |
609 | radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) { | |
610 | flow = *slot; | |
611 | wake_up_interruptible_all(&flow->resume_tx); | |
612 | } | |
613 | mutex_unlock(&node->qrtr_tx_lock); | |
614 | ||
bdabad3e CC |
615 | qrtr_node_release(node); |
616 | ep->node = NULL; | |
617 | } | |
618 | EXPORT_SYMBOL_GPL(qrtr_endpoint_unregister); | |
619 | ||
620 | /* Lookup socket by port. | |
621 | * | |
622 | * Callers must release with qrtr_port_put() | |
623 | */ | |
624 | static struct qrtr_sock *qrtr_port_lookup(int port) | |
625 | { | |
626 | struct qrtr_sock *ipc; | |
627 | ||
628 | if (port == QRTR_PORT_CTRL) | |
629 | port = 0; | |
630 | ||
f16a4b26 | 631 | rcu_read_lock(); |
bdabad3e CC |
632 | ipc = idr_find(&qrtr_ports, port); |
633 | if (ipc) | |
634 | sock_hold(&ipc->sk); | |
f16a4b26 | 635 | rcu_read_unlock(); |
bdabad3e CC |
636 | |
637 | return ipc; | |
638 | } | |
639 | ||
640 | /* Release acquired socket. */ | |
641 | static void qrtr_port_put(struct qrtr_sock *ipc) | |
642 | { | |
643 | sock_put(&ipc->sk); | |
644 | } | |
645 | ||
646 | /* Remove port assignment. */ | |
647 | static void qrtr_port_remove(struct qrtr_sock *ipc) | |
648 | { | |
1a7959c7 | 649 | struct qrtr_ctrl_pkt *pkt; |
1784473b | 650 | struct sk_buff *skb; |
bdabad3e | 651 | int port = ipc->us.sq_port; |
e7044482 BA |
652 | struct sockaddr_qrtr to; |
653 | ||
654 | to.sq_family = AF_QIPCRTR; | |
655 | to.sq_node = QRTR_NODE_BCAST; | |
656 | to.sq_port = QRTR_PORT_CTRL; | |
bdabad3e | 657 | |
1a7959c7 | 658 | skb = qrtr_alloc_ctrl_packet(&pkt); |
1784473b | 659 | if (skb) { |
1a7959c7 BA |
660 | pkt->cmd = cpu_to_le32(QRTR_TYPE_DEL_CLIENT); |
661 | pkt->client.node = cpu_to_le32(ipc->us.sq_node); | |
662 | pkt->client.port = cpu_to_le32(ipc->us.sq_port); | |
663 | ||
1784473b | 664 | skb_set_owner_w(skb, &ipc->sk); |
e7044482 BA |
665 | qrtr_bcast_enqueue(NULL, skb, QRTR_TYPE_DEL_CLIENT, &ipc->us, |
666 | &to); | |
1784473b BA |
667 | } |
668 | ||
bdabad3e CC |
669 | if (port == QRTR_PORT_CTRL) |
670 | port = 0; | |
671 | ||
672 | __sock_put(&ipc->sk); | |
673 | ||
674 | mutex_lock(&qrtr_port_lock); | |
675 | idr_remove(&qrtr_ports, port); | |
676 | mutex_unlock(&qrtr_port_lock); | |
f16a4b26 BA |
677 | |
678 | /* Ensure that if qrtr_port_lookup() did enter the RCU read section we | |
679 | * wait for it to up increment the refcount */ | |
680 | synchronize_rcu(); | |
bdabad3e CC |
681 | } |
682 | ||
683 | /* Assign port number to socket. | |
684 | * | |
685 | * Specify port in the integer pointed to by port, and it will be adjusted | |
686 | * on return as necesssary. | |
687 | * | |
688 | * Port may be: | |
689 | * 0: Assign ephemeral port in [QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET] | |
690 | * <QRTR_MIN_EPH_SOCKET: Specified; requires CAP_NET_ADMIN | |
691 | * >QRTR_MIN_EPH_SOCKET: Specified; available to all | |
692 | */ | |
693 | static int qrtr_port_assign(struct qrtr_sock *ipc, int *port) | |
694 | { | |
695 | int rc; | |
696 | ||
697 | mutex_lock(&qrtr_port_lock); | |
698 | if (!*port) { | |
699 | rc = idr_alloc(&qrtr_ports, ipc, | |
700 | QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET + 1, | |
701 | GFP_ATOMIC); | |
702 | if (rc >= 0) | |
703 | *port = rc; | |
704 | } else if (*port < QRTR_MIN_EPH_SOCKET && !capable(CAP_NET_ADMIN)) { | |
705 | rc = -EACCES; | |
706 | } else if (*port == QRTR_PORT_CTRL) { | |
707 | rc = idr_alloc(&qrtr_ports, ipc, 0, 1, GFP_ATOMIC); | |
708 | } else { | |
709 | rc = idr_alloc(&qrtr_ports, ipc, *port, *port + 1, GFP_ATOMIC); | |
710 | if (rc >= 0) | |
711 | *port = rc; | |
712 | } | |
713 | mutex_unlock(&qrtr_port_lock); | |
714 | ||
715 | if (rc == -ENOSPC) | |
716 | return -EADDRINUSE; | |
717 | else if (rc < 0) | |
718 | return rc; | |
719 | ||
720 | sock_hold(&ipc->sk); | |
721 | ||
722 | return 0; | |
723 | } | |
724 | ||
b24844b1 BA |
725 | /* Reset all non-control ports */ |
726 | static void qrtr_reset_ports(void) | |
727 | { | |
728 | struct qrtr_sock *ipc; | |
729 | int id; | |
730 | ||
731 | mutex_lock(&qrtr_port_lock); | |
732 | idr_for_each_entry(&qrtr_ports, ipc, id) { | |
733 | /* Don't reset control port */ | |
734 | if (id == 0) | |
735 | continue; | |
736 | ||
737 | sock_hold(&ipc->sk); | |
738 | ipc->sk.sk_err = ENETRESET; | |
ae85bfa8 | 739 | ipc->sk.sk_error_report(&ipc->sk); |
b24844b1 BA |
740 | sock_put(&ipc->sk); |
741 | } | |
742 | mutex_unlock(&qrtr_port_lock); | |
743 | } | |
744 | ||
bdabad3e CC |
745 | /* Bind socket to address. |
746 | * | |
747 | * Socket should be locked upon call. | |
748 | */ | |
749 | static int __qrtr_bind(struct socket *sock, | |
750 | const struct sockaddr_qrtr *addr, int zapped) | |
751 | { | |
752 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
753 | struct sock *sk = sock->sk; | |
754 | int port; | |
755 | int rc; | |
756 | ||
757 | /* rebinding ok */ | |
758 | if (!zapped && addr->sq_port == ipc->us.sq_port) | |
759 | return 0; | |
760 | ||
761 | port = addr->sq_port; | |
762 | rc = qrtr_port_assign(ipc, &port); | |
763 | if (rc) | |
764 | return rc; | |
765 | ||
766 | /* unbind previous, if any */ | |
767 | if (!zapped) | |
768 | qrtr_port_remove(ipc); | |
769 | ipc->us.sq_port = port; | |
770 | ||
771 | sock_reset_flag(sk, SOCK_ZAPPED); | |
772 | ||
b24844b1 BA |
773 | /* Notify all open ports about the new controller */ |
774 | if (port == QRTR_PORT_CTRL) | |
775 | qrtr_reset_ports(); | |
776 | ||
bdabad3e CC |
777 | return 0; |
778 | } | |
779 | ||
780 | /* Auto bind to an ephemeral port. */ | |
781 | static int qrtr_autobind(struct socket *sock) | |
782 | { | |
783 | struct sock *sk = sock->sk; | |
784 | struct sockaddr_qrtr addr; | |
785 | ||
786 | if (!sock_flag(sk, SOCK_ZAPPED)) | |
787 | return 0; | |
788 | ||
789 | addr.sq_family = AF_QIPCRTR; | |
790 | addr.sq_node = qrtr_local_nid; | |
791 | addr.sq_port = 0; | |
792 | ||
793 | return __qrtr_bind(sock, &addr, 1); | |
794 | } | |
795 | ||
796 | /* Bind socket to specified sockaddr. */ | |
797 | static int qrtr_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
798 | { | |
799 | DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr); | |
800 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
801 | struct sock *sk = sock->sk; | |
802 | int rc; | |
803 | ||
804 | if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR) | |
805 | return -EINVAL; | |
806 | ||
807 | if (addr->sq_node != ipc->us.sq_node) | |
808 | return -EINVAL; | |
809 | ||
810 | lock_sock(sk); | |
811 | rc = __qrtr_bind(sock, addr, sock_flag(sk, SOCK_ZAPPED)); | |
812 | release_sock(sk); | |
813 | ||
814 | return rc; | |
815 | } | |
816 | ||
817 | /* Queue packet to local peer socket. */ | |
e7044482 BA |
818 | static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb, |
819 | int type, struct sockaddr_qrtr *from, | |
820 | struct sockaddr_qrtr *to) | |
bdabad3e | 821 | { |
bdabad3e | 822 | struct qrtr_sock *ipc; |
f507a9b6 | 823 | struct qrtr_cb *cb; |
bdabad3e | 824 | |
e7044482 | 825 | ipc = qrtr_port_lookup(to->sq_port); |
bdabad3e CC |
826 | if (!ipc || &ipc->sk == skb->sk) { /* do not send to self */ |
827 | kfree_skb(skb); | |
828 | return -ENODEV; | |
829 | } | |
830 | ||
f507a9b6 BA |
831 | cb = (struct qrtr_cb *)skb->cb; |
832 | cb->src_node = from->sq_node; | |
833 | cb->src_port = from->sq_port; | |
e7044482 | 834 | |
bdabad3e CC |
835 | if (sock_queue_rcv_skb(&ipc->sk, skb)) { |
836 | qrtr_port_put(ipc); | |
837 | kfree_skb(skb); | |
838 | return -ENOSPC; | |
839 | } | |
840 | ||
841 | qrtr_port_put(ipc); | |
842 | ||
843 | return 0; | |
844 | } | |
845 | ||
846 | /* Queue packet for broadcast. */ | |
e7044482 BA |
847 | static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb, |
848 | int type, struct sockaddr_qrtr *from, | |
849 | struct sockaddr_qrtr *to) | |
bdabad3e CC |
850 | { |
851 | struct sk_buff *skbn; | |
852 | ||
853 | mutex_lock(&qrtr_node_lock); | |
854 | list_for_each_entry(node, &qrtr_all_nodes, item) { | |
855 | skbn = skb_clone(skb, GFP_KERNEL); | |
856 | if (!skbn) | |
857 | break; | |
858 | skb_set_owner_w(skbn, skb->sk); | |
e7044482 | 859 | qrtr_node_enqueue(node, skbn, type, from, to); |
bdabad3e CC |
860 | } |
861 | mutex_unlock(&qrtr_node_lock); | |
862 | ||
d28ea1fb | 863 | qrtr_local_enqueue(NULL, skb, type, from, to); |
bdabad3e CC |
864 | |
865 | return 0; | |
866 | } | |
867 | ||
868 | static int qrtr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) | |
869 | { | |
870 | DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name); | |
e7044482 BA |
871 | int (*enqueue_fn)(struct qrtr_node *, struct sk_buff *, int, |
872 | struct sockaddr_qrtr *, struct sockaddr_qrtr *); | |
8f5e2451 | 873 | __le32 qrtr_type = cpu_to_le32(QRTR_TYPE_DATA); |
bdabad3e CC |
874 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); |
875 | struct sock *sk = sock->sk; | |
876 | struct qrtr_node *node; | |
bdabad3e CC |
877 | struct sk_buff *skb; |
878 | size_t plen; | |
7036e621 | 879 | u32 type; |
bdabad3e CC |
880 | int rc; |
881 | ||
882 | if (msg->msg_flags & ~(MSG_DONTWAIT)) | |
883 | return -EINVAL; | |
884 | ||
885 | if (len > 65535) | |
886 | return -EMSGSIZE; | |
887 | ||
888 | lock_sock(sk); | |
889 | ||
890 | if (addr) { | |
891 | if (msg->msg_namelen < sizeof(*addr)) { | |
892 | release_sock(sk); | |
893 | return -EINVAL; | |
894 | } | |
895 | ||
896 | if (addr->sq_family != AF_QIPCRTR) { | |
897 | release_sock(sk); | |
898 | return -EINVAL; | |
899 | } | |
900 | ||
901 | rc = qrtr_autobind(sock); | |
902 | if (rc) { | |
903 | release_sock(sk); | |
904 | return rc; | |
905 | } | |
906 | } else if (sk->sk_state == TCP_ESTABLISHED) { | |
907 | addr = &ipc->peer; | |
908 | } else { | |
909 | release_sock(sk); | |
910 | return -ENOTCONN; | |
911 | } | |
912 | ||
913 | node = NULL; | |
914 | if (addr->sq_node == QRTR_NODE_BCAST) { | |
6dbf02ac WW |
915 | if (addr->sq_port != QRTR_PORT_CTRL && |
916 | qrtr_local_nid != QRTR_NODE_BCAST) { | |
fdf5fd39 AKN |
917 | release_sock(sk); |
918 | return -ENOTCONN; | |
919 | } | |
6dbf02ac | 920 | enqueue_fn = qrtr_bcast_enqueue; |
bdabad3e CC |
921 | } else if (addr->sq_node == ipc->us.sq_node) { |
922 | enqueue_fn = qrtr_local_enqueue; | |
923 | } else { | |
bdabad3e CC |
924 | node = qrtr_node_lookup(addr->sq_node); |
925 | if (!node) { | |
926 | release_sock(sk); | |
927 | return -ECONNRESET; | |
928 | } | |
6dbf02ac | 929 | enqueue_fn = qrtr_node_enqueue; |
bdabad3e CC |
930 | } |
931 | ||
932 | plen = (len + 3) & ~3; | |
194ccc88 | 933 | skb = sock_alloc_send_skb(sk, plen + QRTR_HDR_MAX_SIZE, |
bdabad3e CC |
934 | msg->msg_flags & MSG_DONTWAIT, &rc); |
935 | if (!skb) | |
936 | goto out_node; | |
937 | ||
194ccc88 | 938 | skb_reserve(skb, QRTR_HDR_MAX_SIZE); |
bdabad3e | 939 | |
e7044482 | 940 | rc = memcpy_from_msg(skb_put(skb, len), msg, len); |
bdabad3e CC |
941 | if (rc) { |
942 | kfree_skb(skb); | |
943 | goto out_node; | |
944 | } | |
945 | ||
bdabad3e CC |
946 | if (ipc->us.sq_port == QRTR_PORT_CTRL) { |
947 | if (len < 4) { | |
948 | rc = -EINVAL; | |
949 | kfree_skb(skb); | |
950 | goto out_node; | |
951 | } | |
952 | ||
953 | /* control messages already require the type as 'command' */ | |
8f5e2451 | 954 | skb_copy_bits(skb, 0, &qrtr_type, 4); |
bdabad3e CC |
955 | } |
956 | ||
7036e621 | 957 | type = le32_to_cpu(qrtr_type); |
e7044482 | 958 | rc = enqueue_fn(node, skb, type, &ipc->us, addr); |
bdabad3e CC |
959 | if (rc >= 0) |
960 | rc = len; | |
961 | ||
962 | out_node: | |
963 | qrtr_node_release(node); | |
964 | release_sock(sk); | |
965 | ||
966 | return rc; | |
967 | } | |
968 | ||
cb6530b9 BA |
969 | static int qrtr_send_resume_tx(struct qrtr_cb *cb) |
970 | { | |
971 | struct sockaddr_qrtr remote = { AF_QIPCRTR, cb->src_node, cb->src_port }; | |
972 | struct sockaddr_qrtr local = { AF_QIPCRTR, cb->dst_node, cb->dst_port }; | |
973 | struct qrtr_ctrl_pkt *pkt; | |
974 | struct qrtr_node *node; | |
975 | struct sk_buff *skb; | |
976 | int ret; | |
977 | ||
978 | node = qrtr_node_lookup(remote.sq_node); | |
979 | if (!node) | |
980 | return -EINVAL; | |
981 | ||
982 | skb = qrtr_alloc_ctrl_packet(&pkt); | |
983 | if (!skb) | |
984 | return -ENOMEM; | |
985 | ||
986 | pkt->cmd = cpu_to_le32(QRTR_TYPE_RESUME_TX); | |
987 | pkt->client.node = cpu_to_le32(cb->dst_node); | |
988 | pkt->client.port = cpu_to_le32(cb->dst_port); | |
989 | ||
990 | ret = qrtr_node_enqueue(node, skb, QRTR_TYPE_RESUME_TX, &local, &remote); | |
991 | ||
992 | qrtr_node_release(node); | |
993 | ||
994 | return ret; | |
995 | } | |
996 | ||
bdabad3e CC |
997 | static int qrtr_recvmsg(struct socket *sock, struct msghdr *msg, |
998 | size_t size, int flags) | |
999 | { | |
1000 | DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name); | |
bdabad3e CC |
1001 | struct sock *sk = sock->sk; |
1002 | struct sk_buff *skb; | |
f507a9b6 | 1003 | struct qrtr_cb *cb; |
bdabad3e CC |
1004 | int copied, rc; |
1005 | ||
1006 | lock_sock(sk); | |
1007 | ||
1008 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
1009 | release_sock(sk); | |
1010 | return -EADDRNOTAVAIL; | |
1011 | } | |
1012 | ||
1013 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
1014 | flags & MSG_DONTWAIT, &rc); | |
1015 | if (!skb) { | |
1016 | release_sock(sk); | |
1017 | return rc; | |
1018 | } | |
cb6530b9 | 1019 | cb = (struct qrtr_cb *)skb->cb; |
bdabad3e | 1020 | |
f507a9b6 | 1021 | copied = skb->len; |
bdabad3e CC |
1022 | if (copied > size) { |
1023 | copied = size; | |
1024 | msg->msg_flags |= MSG_TRUNC; | |
1025 | } | |
1026 | ||
f507a9b6 | 1027 | rc = skb_copy_datagram_msg(skb, 0, msg, copied); |
bdabad3e CC |
1028 | if (rc < 0) |
1029 | goto out; | |
1030 | rc = copied; | |
1031 | ||
1032 | if (addr) { | |
1033 | addr->sq_family = AF_QIPCRTR; | |
f507a9b6 BA |
1034 | addr->sq_node = cb->src_node; |
1035 | addr->sq_port = cb->src_port; | |
bdabad3e CC |
1036 | msg->msg_namelen = sizeof(*addr); |
1037 | } | |
1038 | ||
1039 | out: | |
cb6530b9 BA |
1040 | if (cb->confirm_rx) |
1041 | qrtr_send_resume_tx(cb); | |
1042 | ||
bdabad3e CC |
1043 | skb_free_datagram(sk, skb); |
1044 | release_sock(sk); | |
1045 | ||
1046 | return rc; | |
1047 | } | |
1048 | ||
1049 | static int qrtr_connect(struct socket *sock, struct sockaddr *saddr, | |
1050 | int len, int flags) | |
1051 | { | |
1052 | DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr); | |
1053 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
1054 | struct sock *sk = sock->sk; | |
1055 | int rc; | |
1056 | ||
1057 | if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR) | |
1058 | return -EINVAL; | |
1059 | ||
1060 | lock_sock(sk); | |
1061 | ||
1062 | sk->sk_state = TCP_CLOSE; | |
1063 | sock->state = SS_UNCONNECTED; | |
1064 | ||
1065 | rc = qrtr_autobind(sock); | |
1066 | if (rc) { | |
1067 | release_sock(sk); | |
1068 | return rc; | |
1069 | } | |
1070 | ||
1071 | ipc->peer = *addr; | |
1072 | sock->state = SS_CONNECTED; | |
1073 | sk->sk_state = TCP_ESTABLISHED; | |
1074 | ||
1075 | release_sock(sk); | |
1076 | ||
1077 | return 0; | |
1078 | } | |
1079 | ||
1080 | static int qrtr_getname(struct socket *sock, struct sockaddr *saddr, | |
9b2c45d4 | 1081 | int peer) |
bdabad3e CC |
1082 | { |
1083 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
1084 | struct sockaddr_qrtr qaddr; | |
1085 | struct sock *sk = sock->sk; | |
1086 | ||
1087 | lock_sock(sk); | |
1088 | if (peer) { | |
1089 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1090 | release_sock(sk); | |
1091 | return -ENOTCONN; | |
1092 | } | |
1093 | ||
1094 | qaddr = ipc->peer; | |
1095 | } else { | |
1096 | qaddr = ipc->us; | |
1097 | } | |
1098 | release_sock(sk); | |
1099 | ||
bdabad3e CC |
1100 | qaddr.sq_family = AF_QIPCRTR; |
1101 | ||
1102 | memcpy(saddr, &qaddr, sizeof(qaddr)); | |
1103 | ||
9b2c45d4 | 1104 | return sizeof(qaddr); |
bdabad3e CC |
1105 | } |
1106 | ||
1107 | static int qrtr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1108 | { | |
1109 | void __user *argp = (void __user *)arg; | |
1110 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
1111 | struct sock *sk = sock->sk; | |
1112 | struct sockaddr_qrtr *sq; | |
1113 | struct sk_buff *skb; | |
1114 | struct ifreq ifr; | |
1115 | long len = 0; | |
1116 | int rc = 0; | |
1117 | ||
1118 | lock_sock(sk); | |
1119 | ||
1120 | switch (cmd) { | |
1121 | case TIOCOUTQ: | |
1122 | len = sk->sk_sndbuf - sk_wmem_alloc_get(sk); | |
1123 | if (len < 0) | |
1124 | len = 0; | |
1125 | rc = put_user(len, (int __user *)argp); | |
1126 | break; | |
1127 | case TIOCINQ: | |
1128 | skb = skb_peek(&sk->sk_receive_queue); | |
1129 | if (skb) | |
f507a9b6 | 1130 | len = skb->len; |
bdabad3e CC |
1131 | rc = put_user(len, (int __user *)argp); |
1132 | break; | |
1133 | case SIOCGIFADDR: | |
1134 | if (copy_from_user(&ifr, argp, sizeof(ifr))) { | |
1135 | rc = -EFAULT; | |
1136 | break; | |
1137 | } | |
1138 | ||
1139 | sq = (struct sockaddr_qrtr *)&ifr.ifr_addr; | |
1140 | *sq = ipc->us; | |
1141 | if (copy_to_user(argp, &ifr, sizeof(ifr))) { | |
1142 | rc = -EFAULT; | |
1143 | break; | |
1144 | } | |
1145 | break; | |
bdabad3e CC |
1146 | case SIOCADDRT: |
1147 | case SIOCDELRT: | |
1148 | case SIOCSIFADDR: | |
1149 | case SIOCGIFDSTADDR: | |
1150 | case SIOCSIFDSTADDR: | |
1151 | case SIOCGIFBRDADDR: | |
1152 | case SIOCSIFBRDADDR: | |
1153 | case SIOCGIFNETMASK: | |
1154 | case SIOCSIFNETMASK: | |
1155 | rc = -EINVAL; | |
1156 | break; | |
1157 | default: | |
1158 | rc = -ENOIOCTLCMD; | |
1159 | break; | |
1160 | } | |
1161 | ||
1162 | release_sock(sk); | |
1163 | ||
1164 | return rc; | |
1165 | } | |
1166 | ||
1167 | static int qrtr_release(struct socket *sock) | |
1168 | { | |
1169 | struct sock *sk = sock->sk; | |
1170 | struct qrtr_sock *ipc; | |
1171 | ||
1172 | if (!sk) | |
1173 | return 0; | |
1174 | ||
1175 | lock_sock(sk); | |
1176 | ||
1177 | ipc = qrtr_sk(sk); | |
1178 | sk->sk_shutdown = SHUTDOWN_MASK; | |
1179 | if (!sock_flag(sk, SOCK_DEAD)) | |
1180 | sk->sk_state_change(sk); | |
1181 | ||
1182 | sock_set_flag(sk, SOCK_DEAD); | |
1183 | sock->sk = NULL; | |
1184 | ||
1185 | if (!sock_flag(sk, SOCK_ZAPPED)) | |
1186 | qrtr_port_remove(ipc); | |
1187 | ||
1188 | skb_queue_purge(&sk->sk_receive_queue); | |
1189 | ||
1190 | release_sock(sk); | |
1191 | sock_put(sk); | |
1192 | ||
1193 | return 0; | |
1194 | } | |
1195 | ||
1196 | static const struct proto_ops qrtr_proto_ops = { | |
1197 | .owner = THIS_MODULE, | |
1198 | .family = AF_QIPCRTR, | |
1199 | .bind = qrtr_bind, | |
1200 | .connect = qrtr_connect, | |
1201 | .socketpair = sock_no_socketpair, | |
1202 | .accept = sock_no_accept, | |
1203 | .listen = sock_no_listen, | |
1204 | .sendmsg = qrtr_sendmsg, | |
1205 | .recvmsg = qrtr_recvmsg, | |
1206 | .getname = qrtr_getname, | |
1207 | .ioctl = qrtr_ioctl, | |
c7cbdbf2 | 1208 | .gettstamp = sock_gettstamp, |
a11e1d43 | 1209 | .poll = datagram_poll, |
bdabad3e CC |
1210 | .shutdown = sock_no_shutdown, |
1211 | .setsockopt = sock_no_setsockopt, | |
1212 | .getsockopt = sock_no_getsockopt, | |
1213 | .release = qrtr_release, | |
1214 | .mmap = sock_no_mmap, | |
1215 | .sendpage = sock_no_sendpage, | |
1216 | }; | |
1217 | ||
1218 | static struct proto qrtr_proto = { | |
1219 | .name = "QIPCRTR", | |
1220 | .owner = THIS_MODULE, | |
1221 | .obj_size = sizeof(struct qrtr_sock), | |
1222 | }; | |
1223 | ||
1224 | static int qrtr_create(struct net *net, struct socket *sock, | |
1225 | int protocol, int kern) | |
1226 | { | |
1227 | struct qrtr_sock *ipc; | |
1228 | struct sock *sk; | |
1229 | ||
1230 | if (sock->type != SOCK_DGRAM) | |
1231 | return -EPROTOTYPE; | |
1232 | ||
1233 | sk = sk_alloc(net, AF_QIPCRTR, GFP_KERNEL, &qrtr_proto, kern); | |
1234 | if (!sk) | |
1235 | return -ENOMEM; | |
1236 | ||
1237 | sock_set_flag(sk, SOCK_ZAPPED); | |
1238 | ||
1239 | sock_init_data(sock, sk); | |
1240 | sock->ops = &qrtr_proto_ops; | |
1241 | ||
1242 | ipc = qrtr_sk(sk); | |
1243 | ipc->us.sq_family = AF_QIPCRTR; | |
1244 | ipc->us.sq_node = qrtr_local_nid; | |
1245 | ipc->us.sq_port = 0; | |
1246 | ||
1247 | return 0; | |
1248 | } | |
1249 | ||
bdabad3e CC |
1250 | static const struct net_proto_family qrtr_family = { |
1251 | .owner = THIS_MODULE, | |
1252 | .family = AF_QIPCRTR, | |
1253 | .create = qrtr_create, | |
1254 | }; | |
1255 | ||
1256 | static int __init qrtr_proto_init(void) | |
1257 | { | |
1258 | int rc; | |
1259 | ||
1260 | rc = proto_register(&qrtr_proto, 1); | |
1261 | if (rc) | |
1262 | return rc; | |
1263 | ||
1264 | rc = sock_register(&qrtr_family); | |
1265 | if (rc) { | |
1266 | proto_unregister(&qrtr_proto); | |
1267 | return rc; | |
1268 | } | |
1269 | ||
71046abf | 1270 | qrtr_ns_init(); |
bdabad3e | 1271 | |
c1c502b5 | 1272 | return rc; |
bdabad3e | 1273 | } |
b7e732fa | 1274 | postcore_initcall(qrtr_proto_init); |
bdabad3e CC |
1275 | |
1276 | static void __exit qrtr_proto_fini(void) | |
1277 | { | |
0c2204a4 | 1278 | qrtr_ns_remove(); |
bdabad3e CC |
1279 | sock_unregister(qrtr_family.family); |
1280 | proto_unregister(&qrtr_proto); | |
1281 | } | |
1282 | module_exit(qrtr_proto_fini); | |
1283 | ||
1284 | MODULE_DESCRIPTION("Qualcomm IPC-router driver"); | |
1285 | MODULE_LICENSE("GPL v2"); | |
77ac725e | 1286 | MODULE_ALIAS_NETPROTO(PF_QIPCRTR); |