Commit | Line | Data |
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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); |
90829f07 LP |
174 | /* If the node is a bridge for other nodes, there are possibly |
175 | * multiple entries pointing to our released node, delete them all. | |
176 | */ | |
177 | radix_tree_for_each_slot(slot, &qrtr_nodes, &iter, 0) { | |
178 | if (*slot == node) | |
179 | radix_tree_iter_delete(&qrtr_nodes, &iter, slot); | |
180 | } | |
0a7e0d0e | 181 | spin_unlock_irqrestore(&qrtr_nodes_lock, flags); |
bdabad3e CC |
182 | |
183 | list_del(&node->item); | |
184 | mutex_unlock(&qrtr_node_lock); | |
185 | ||
186 | skb_queue_purge(&node->rx_queue); | |
5fdeb0d3 BA |
187 | |
188 | /* Free tx flow counters */ | |
189 | radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) { | |
28541f3d | 190 | flow = *slot; |
5fdeb0d3 | 191 | radix_tree_iter_delete(&node->qrtr_tx_flow, &iter, slot); |
28541f3d | 192 | kfree(flow); |
5fdeb0d3 | 193 | } |
bdabad3e CC |
194 | kfree(node); |
195 | } | |
196 | ||
197 | /* Increment reference to node. */ | |
198 | static struct qrtr_node *qrtr_node_acquire(struct qrtr_node *node) | |
199 | { | |
200 | if (node) | |
201 | kref_get(&node->ref); | |
202 | return node; | |
203 | } | |
204 | ||
205 | /* Decrement reference to node and release as necessary. */ | |
206 | static void qrtr_node_release(struct qrtr_node *node) | |
207 | { | |
208 | if (!node) | |
209 | return; | |
210 | kref_put_mutex(&node->ref, __qrtr_node_release, &qrtr_node_lock); | |
211 | } | |
212 | ||
5fdeb0d3 BA |
213 | /** |
214 | * qrtr_tx_resume() - reset flow control counter | |
215 | * @node: qrtr_node that the QRTR_TYPE_RESUME_TX packet arrived on | |
216 | * @skb: resume_tx packet | |
217 | */ | |
218 | static void qrtr_tx_resume(struct qrtr_node *node, struct sk_buff *skb) | |
219 | { | |
220 | struct qrtr_ctrl_pkt *pkt = (struct qrtr_ctrl_pkt *)skb->data; | |
221 | u64 remote_node = le32_to_cpu(pkt->client.node); | |
222 | u32 remote_port = le32_to_cpu(pkt->client.port); | |
223 | struct qrtr_tx_flow *flow; | |
224 | unsigned long key; | |
225 | ||
226 | key = remote_node << 32 | remote_port; | |
227 | ||
228 | rcu_read_lock(); | |
229 | flow = radix_tree_lookup(&node->qrtr_tx_flow, key); | |
230 | rcu_read_unlock(); | |
231 | if (flow) { | |
232 | spin_lock(&flow->resume_tx.lock); | |
233 | flow->pending = 0; | |
234 | spin_unlock(&flow->resume_tx.lock); | |
235 | wake_up_interruptible_all(&flow->resume_tx); | |
236 | } | |
237 | ||
238 | consume_skb(skb); | |
239 | } | |
240 | ||
241 | /** | |
242 | * qrtr_tx_wait() - flow control for outgoing packets | |
243 | * @node: qrtr_node that the packet is to be send to | |
244 | * @dest_node: node id of the destination | |
245 | * @dest_port: port number of the destination | |
246 | * @type: type of message | |
247 | * | |
248 | * The flow control scheme is based around the low and high "watermarks". When | |
249 | * the low watermark is passed the confirm_rx flag is set on the outgoing | |
250 | * message, which will trigger the remote to send a control message of the type | |
251 | * QRTR_TYPE_RESUME_TX to reset the counter. If the high watermark is hit | |
252 | * further transmision should be paused. | |
253 | * | |
254 | * Return: 1 if confirm_rx should be set, 0 otherwise or errno failure | |
255 | */ | |
256 | static int qrtr_tx_wait(struct qrtr_node *node, int dest_node, int dest_port, | |
257 | int type) | |
258 | { | |
259 | unsigned long key = (u64)dest_node << 32 | dest_port; | |
260 | struct qrtr_tx_flow *flow; | |
261 | int confirm_rx = 0; | |
262 | int ret; | |
263 | ||
264 | /* Never set confirm_rx on non-data packets */ | |
265 | if (type != QRTR_TYPE_DATA) | |
266 | return 0; | |
267 | ||
268 | mutex_lock(&node->qrtr_tx_lock); | |
269 | flow = radix_tree_lookup(&node->qrtr_tx_flow, key); | |
270 | if (!flow) { | |
271 | flow = kzalloc(sizeof(*flow), GFP_KERNEL); | |
272 | if (flow) { | |
273 | init_waitqueue_head(&flow->resume_tx); | |
274 | radix_tree_insert(&node->qrtr_tx_flow, key, flow); | |
275 | } | |
276 | } | |
277 | mutex_unlock(&node->qrtr_tx_lock); | |
278 | ||
279 | /* Set confirm_rx if we where unable to find and allocate a flow */ | |
280 | if (!flow) | |
281 | return 1; | |
282 | ||
283 | spin_lock_irq(&flow->resume_tx.lock); | |
284 | ret = wait_event_interruptible_locked_irq(flow->resume_tx, | |
285 | flow->pending < QRTR_TX_FLOW_HIGH || | |
286 | flow->tx_failed || | |
287 | !node->ep); | |
288 | if (ret < 0) { | |
289 | confirm_rx = ret; | |
290 | } else if (!node->ep) { | |
291 | confirm_rx = -EPIPE; | |
292 | } else if (flow->tx_failed) { | |
293 | flow->tx_failed = 0; | |
294 | confirm_rx = 1; | |
295 | } else { | |
296 | flow->pending++; | |
297 | confirm_rx = flow->pending == QRTR_TX_FLOW_LOW; | |
298 | } | |
299 | spin_unlock_irq(&flow->resume_tx.lock); | |
300 | ||
301 | return confirm_rx; | |
302 | } | |
303 | ||
304 | /** | |
305 | * qrtr_tx_flow_failed() - flag that tx of confirm_rx flagged messages failed | |
306 | * @node: qrtr_node that the packet is to be send to | |
307 | * @dest_node: node id of the destination | |
308 | * @dest_port: port number of the destination | |
309 | * | |
310 | * Signal that the transmission of a message with confirm_rx flag failed. The | |
311 | * flow's "pending" counter will keep incrementing towards QRTR_TX_FLOW_HIGH, | |
312 | * at which point transmission would stall forever waiting for the resume TX | |
313 | * message associated with the dropped confirm_rx message. | |
314 | * Work around this by marking the flow as having a failed transmission and | |
315 | * cause the next transmission attempt to be sent with the confirm_rx. | |
316 | */ | |
317 | static void qrtr_tx_flow_failed(struct qrtr_node *node, int dest_node, | |
318 | int dest_port) | |
319 | { | |
320 | unsigned long key = (u64)dest_node << 32 | dest_port; | |
321 | struct qrtr_tx_flow *flow; | |
322 | ||
323 | rcu_read_lock(); | |
324 | flow = radix_tree_lookup(&node->qrtr_tx_flow, key); | |
325 | rcu_read_unlock(); | |
326 | if (flow) { | |
327 | spin_lock_irq(&flow->resume_tx.lock); | |
328 | flow->tx_failed = 1; | |
329 | spin_unlock_irq(&flow->resume_tx.lock); | |
330 | } | |
331 | } | |
332 | ||
bdabad3e | 333 | /* Pass an outgoing packet socket buffer to the endpoint driver. */ |
e7044482 BA |
334 | static int qrtr_node_enqueue(struct qrtr_node *node, struct sk_buff *skb, |
335 | int type, struct sockaddr_qrtr *from, | |
336 | struct sockaddr_qrtr *to) | |
bdabad3e | 337 | { |
194ccc88 | 338 | struct qrtr_hdr_v1 *hdr; |
e7044482 | 339 | size_t len = skb->len; |
3ca1a42a | 340 | int rc, confirm_rx; |
5fdeb0d3 BA |
341 | |
342 | confirm_rx = qrtr_tx_wait(node, to->sq_node, to->sq_port, type); | |
343 | if (confirm_rx < 0) { | |
344 | kfree_skb(skb); | |
345 | return confirm_rx; | |
346 | } | |
bdabad3e | 347 | |
194ccc88 BA |
348 | hdr = skb_push(skb, sizeof(*hdr)); |
349 | hdr->version = cpu_to_le32(QRTR_PROTO_VER_1); | |
e7044482 BA |
350 | hdr->type = cpu_to_le32(type); |
351 | hdr->src_node_id = cpu_to_le32(from->sq_node); | |
352 | hdr->src_port_id = cpu_to_le32(from->sq_port); | |
d27e77a3 AKN |
353 | if (to->sq_port == QRTR_PORT_CTRL) { |
354 | hdr->dst_node_id = cpu_to_le32(node->nid); | |
ae068f56 | 355 | hdr->dst_port_id = cpu_to_le32(QRTR_PORT_CTRL); |
d27e77a3 AKN |
356 | } else { |
357 | hdr->dst_node_id = cpu_to_le32(to->sq_node); | |
358 | hdr->dst_port_id = cpu_to_le32(to->sq_port); | |
359 | } | |
e7044482 BA |
360 | |
361 | hdr->size = cpu_to_le32(len); | |
5fdeb0d3 | 362 | hdr->confirm_rx = !!confirm_rx; |
e7044482 | 363 | |
3ca1a42a | 364 | rc = skb_put_padto(skb, ALIGN(len, 4) + sizeof(*hdr)); |
bdabad3e | 365 | |
3ca1a42a ED |
366 | if (!rc) { |
367 | mutex_lock(&node->ep_lock); | |
368 | rc = -ENODEV; | |
369 | if (node->ep) | |
370 | rc = node->ep->xmit(node->ep, skb); | |
371 | else | |
372 | kfree_skb(skb); | |
373 | mutex_unlock(&node->ep_lock); | |
374 | } | |
5fdeb0d3 BA |
375 | /* Need to ensure that a subsequent message carries the otherwise lost |
376 | * confirm_rx flag if we dropped this one */ | |
377 | if (rc && confirm_rx) | |
378 | qrtr_tx_flow_failed(node, to->sq_node, to->sq_port); | |
379 | ||
bdabad3e CC |
380 | return rc; |
381 | } | |
382 | ||
383 | /* Lookup node by id. | |
384 | * | |
385 | * callers must release with qrtr_node_release() | |
386 | */ | |
387 | static struct qrtr_node *qrtr_node_lookup(unsigned int nid) | |
388 | { | |
389 | struct qrtr_node *node; | |
0a7e0d0e | 390 | unsigned long flags; |
bdabad3e | 391 | |
0a7e0d0e | 392 | spin_lock_irqsave(&qrtr_nodes_lock, flags); |
bdabad3e CC |
393 | node = radix_tree_lookup(&qrtr_nodes, nid); |
394 | node = qrtr_node_acquire(node); | |
0a7e0d0e | 395 | spin_unlock_irqrestore(&qrtr_nodes_lock, flags); |
bdabad3e CC |
396 | |
397 | return node; | |
398 | } | |
399 | ||
400 | /* Assign node id to node. | |
401 | * | |
402 | * This is mostly useful for automatic node id assignment, based on | |
403 | * the source id in the incoming packet. | |
404 | */ | |
405 | static void qrtr_node_assign(struct qrtr_node *node, unsigned int nid) | |
406 | { | |
0a7e0d0e BA |
407 | unsigned long flags; |
408 | ||
0baa99ee | 409 | if (nid == QRTR_EP_NID_AUTO) |
bdabad3e CC |
410 | return; |
411 | ||
0a7e0d0e | 412 | spin_lock_irqsave(&qrtr_nodes_lock, flags); |
bdabad3e | 413 | radix_tree_insert(&qrtr_nodes, nid, node); |
0baa99ee LP |
414 | if (node->nid == QRTR_EP_NID_AUTO) |
415 | node->nid = nid; | |
0a7e0d0e | 416 | spin_unlock_irqrestore(&qrtr_nodes_lock, flags); |
bdabad3e CC |
417 | } |
418 | ||
419 | /** | |
420 | * qrtr_endpoint_post() - post incoming data | |
421 | * @ep: endpoint handle | |
422 | * @data: data pointer | |
423 | * @len: size of data in bytes | |
424 | * | |
425 | * Return: 0 on success; negative error code on failure | |
426 | */ | |
427 | int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len) | |
428 | { | |
429 | struct qrtr_node *node = ep->node; | |
194ccc88 BA |
430 | const struct qrtr_hdr_v1 *v1; |
431 | const struct qrtr_hdr_v2 *v2; | |
e04df98a | 432 | struct qrtr_sock *ipc; |
bdabad3e | 433 | struct sk_buff *skb; |
f507a9b6 | 434 | struct qrtr_cb *cb; |
bdabad3e | 435 | unsigned int size; |
bdabad3e | 436 | unsigned int ver; |
194ccc88 | 437 | size_t hdrlen; |
bdabad3e | 438 | |
8ff41cc2 | 439 | if (len == 0 || len & 3) |
bdabad3e CC |
440 | return -EINVAL; |
441 | ||
442 | skb = netdev_alloc_skb(NULL, len); | |
443 | if (!skb) | |
444 | return -ENOMEM; | |
445 | ||
f507a9b6 | 446 | cb = (struct qrtr_cb *)skb->cb; |
f507a9b6 | 447 | |
194ccc88 BA |
448 | /* Version field in v1 is little endian, so this works for both cases */ |
449 | ver = *(u8*)data; | |
450 | ||
451 | switch (ver) { | |
452 | case QRTR_PROTO_VER_1: | |
8ff41cc2 DC |
453 | if (len < sizeof(*v1)) |
454 | goto err; | |
194ccc88 BA |
455 | v1 = data; |
456 | hdrlen = sizeof(*v1); | |
457 | ||
458 | cb->type = le32_to_cpu(v1->type); | |
459 | cb->src_node = le32_to_cpu(v1->src_node_id); | |
460 | cb->src_port = le32_to_cpu(v1->src_port_id); | |
461 | cb->confirm_rx = !!v1->confirm_rx; | |
462 | cb->dst_node = le32_to_cpu(v1->dst_node_id); | |
463 | cb->dst_port = le32_to_cpu(v1->dst_port_id); | |
464 | ||
465 | size = le32_to_cpu(v1->size); | |
466 | break; | |
467 | case QRTR_PROTO_VER_2: | |
8ff41cc2 DC |
468 | if (len < sizeof(*v2)) |
469 | goto err; | |
194ccc88 BA |
470 | v2 = data; |
471 | hdrlen = sizeof(*v2) + v2->optlen; | |
472 | ||
473 | cb->type = v2->type; | |
474 | cb->confirm_rx = !!(v2->flags & QRTR_FLAGS_CONFIRM_RX); | |
475 | cb->src_node = le16_to_cpu(v2->src_node_id); | |
476 | cb->src_port = le16_to_cpu(v2->src_port_id); | |
477 | cb->dst_node = le16_to_cpu(v2->dst_node_id); | |
478 | cb->dst_port = le16_to_cpu(v2->dst_port_id); | |
479 | ||
480 | if (cb->src_port == (u16)QRTR_PORT_CTRL) | |
481 | cb->src_port = QRTR_PORT_CTRL; | |
482 | if (cb->dst_port == (u16)QRTR_PORT_CTRL) | |
483 | cb->dst_port = QRTR_PORT_CTRL; | |
484 | ||
485 | size = le32_to_cpu(v2->size); | |
486 | break; | |
487 | default: | |
488 | pr_err("qrtr: Invalid version %d\n", ver); | |
489 | goto err; | |
490 | } | |
491 | ||
492 | if (len != ALIGN(size, 4) + hdrlen) | |
493 | goto err; | |
494 | ||
5fdeb0d3 BA |
495 | if (cb->dst_port != QRTR_PORT_CTRL && cb->type != QRTR_TYPE_DATA && |
496 | cb->type != QRTR_TYPE_RESUME_TX) | |
194ccc88 BA |
497 | goto err; |
498 | ||
499 | skb_put_data(skb, data + hdrlen, size); | |
bdabad3e | 500 | |
e04df98a BA |
501 | qrtr_node_assign(node, cb->src_node); |
502 | ||
0baa99ee LP |
503 | if (cb->type == QRTR_TYPE_NEW_SERVER) { |
504 | /* Remote node endpoint can bridge other distant nodes */ | |
505 | const struct qrtr_ctrl_pkt *pkt = data + hdrlen; | |
506 | ||
507 | qrtr_node_assign(node, le32_to_cpu(pkt->server.node)); | |
508 | } | |
509 | ||
e04df98a BA |
510 | if (cb->type == QRTR_TYPE_RESUME_TX) { |
511 | qrtr_tx_resume(node, skb); | |
512 | } else { | |
513 | ipc = qrtr_port_lookup(cb->dst_port); | |
514 | if (!ipc) | |
515 | goto err; | |
516 | ||
517 | if (sock_queue_rcv_skb(&ipc->sk, skb)) | |
518 | goto err; | |
519 | ||
520 | qrtr_port_put(ipc); | |
521 | } | |
bdabad3e CC |
522 | |
523 | return 0; | |
194ccc88 BA |
524 | |
525 | err: | |
526 | kfree_skb(skb); | |
527 | return -EINVAL; | |
528 | ||
bdabad3e CC |
529 | } |
530 | EXPORT_SYMBOL_GPL(qrtr_endpoint_post); | |
531 | ||
1a7959c7 BA |
532 | /** |
533 | * qrtr_alloc_ctrl_packet() - allocate control packet skb | |
534 | * @pkt: reference to qrtr_ctrl_pkt pointer | |
f7dec6cb | 535 | * @flags: the type of memory to allocate |
1a7959c7 BA |
536 | * |
537 | * Returns newly allocated sk_buff, or NULL on failure | |
538 | * | |
539 | * This function allocates a sk_buff large enough to carry a qrtr_ctrl_pkt and | |
540 | * on success returns a reference to the control packet in @pkt. | |
541 | */ | |
f7dec6cb LP |
542 | static struct sk_buff *qrtr_alloc_ctrl_packet(struct qrtr_ctrl_pkt **pkt, |
543 | gfp_t flags) | |
bdabad3e | 544 | { |
1a7959c7 | 545 | const int pkt_len = sizeof(struct qrtr_ctrl_pkt); |
bdabad3e | 546 | struct sk_buff *skb; |
bdabad3e | 547 | |
f7dec6cb | 548 | skb = alloc_skb(QRTR_HDR_MAX_SIZE + pkt_len, flags); |
bdabad3e CC |
549 | if (!skb) |
550 | return NULL; | |
bdabad3e | 551 | |
194ccc88 | 552 | skb_reserve(skb, QRTR_HDR_MAX_SIZE); |
1a7959c7 | 553 | *pkt = skb_put_zero(skb, pkt_len); |
1784473b BA |
554 | |
555 | return skb; | |
556 | } | |
557 | ||
bdabad3e CC |
558 | /** |
559 | * qrtr_endpoint_register() - register a new endpoint | |
560 | * @ep: endpoint to register | |
561 | * @nid: desired node id; may be QRTR_EP_NID_AUTO for auto-assignment | |
562 | * Return: 0 on success; negative error code on failure | |
563 | * | |
564 | * The specified endpoint must have the xmit function pointer set on call. | |
565 | */ | |
566 | int qrtr_endpoint_register(struct qrtr_endpoint *ep, unsigned int nid) | |
567 | { | |
568 | struct qrtr_node *node; | |
569 | ||
570 | if (!ep || !ep->xmit) | |
571 | return -EINVAL; | |
572 | ||
573 | node = kzalloc(sizeof(*node), GFP_KERNEL); | |
574 | if (!node) | |
575 | return -ENOMEM; | |
576 | ||
bdabad3e CC |
577 | kref_init(&node->ref); |
578 | mutex_init(&node->ep_lock); | |
579 | skb_queue_head_init(&node->rx_queue); | |
580 | node->nid = QRTR_EP_NID_AUTO; | |
581 | node->ep = ep; | |
582 | ||
5fdeb0d3 BA |
583 | INIT_RADIX_TREE(&node->qrtr_tx_flow, GFP_KERNEL); |
584 | mutex_init(&node->qrtr_tx_lock); | |
585 | ||
bdabad3e CC |
586 | qrtr_node_assign(node, nid); |
587 | ||
588 | mutex_lock(&qrtr_node_lock); | |
589 | list_add(&node->item, &qrtr_all_nodes); | |
590 | mutex_unlock(&qrtr_node_lock); | |
591 | ep->node = node; | |
592 | ||
593 | return 0; | |
594 | } | |
595 | EXPORT_SYMBOL_GPL(qrtr_endpoint_register); | |
596 | ||
597 | /** | |
598 | * qrtr_endpoint_unregister - unregister endpoint | |
599 | * @ep: endpoint to unregister | |
600 | */ | |
601 | void qrtr_endpoint_unregister(struct qrtr_endpoint *ep) | |
602 | { | |
603 | struct qrtr_node *node = ep->node; | |
e7044482 BA |
604 | struct sockaddr_qrtr src = {AF_QIPCRTR, node->nid, QRTR_PORT_CTRL}; |
605 | struct sockaddr_qrtr dst = {AF_QIPCRTR, qrtr_local_nid, QRTR_PORT_CTRL}; | |
5fdeb0d3 | 606 | struct radix_tree_iter iter; |
1a7959c7 | 607 | struct qrtr_ctrl_pkt *pkt; |
5fdeb0d3 | 608 | struct qrtr_tx_flow *flow; |
8acc8ee4 | 609 | struct sk_buff *skb; |
90829f07 | 610 | unsigned long flags; |
5fdeb0d3 | 611 | void __rcu **slot; |
bdabad3e CC |
612 | |
613 | mutex_lock(&node->ep_lock); | |
614 | node->ep = NULL; | |
615 | mutex_unlock(&node->ep_lock); | |
616 | ||
8acc8ee4 | 617 | /* Notify the local controller about the event */ |
90829f07 LP |
618 | spin_lock_irqsave(&qrtr_nodes_lock, flags); |
619 | radix_tree_for_each_slot(slot, &qrtr_nodes, &iter, 0) { | |
620 | if (*slot != node) | |
621 | continue; | |
622 | src.sq_node = iter.index; | |
623 | skb = qrtr_alloc_ctrl_packet(&pkt, GFP_ATOMIC); | |
624 | if (skb) { | |
625 | pkt->cmd = cpu_to_le32(QRTR_TYPE_BYE); | |
626 | qrtr_local_enqueue(NULL, skb, QRTR_TYPE_BYE, &src, &dst); | |
627 | } | |
1a7959c7 | 628 | } |
90829f07 | 629 | spin_unlock_irqrestore(&qrtr_nodes_lock, flags); |
8acc8ee4 | 630 | |
5fdeb0d3 BA |
631 | /* Wake up any transmitters waiting for resume-tx from the node */ |
632 | mutex_lock(&node->qrtr_tx_lock); | |
633 | radix_tree_for_each_slot(slot, &node->qrtr_tx_flow, &iter, 0) { | |
634 | flow = *slot; | |
635 | wake_up_interruptible_all(&flow->resume_tx); | |
636 | } | |
637 | mutex_unlock(&node->qrtr_tx_lock); | |
638 | ||
bdabad3e CC |
639 | qrtr_node_release(node); |
640 | ep->node = NULL; | |
641 | } | |
642 | EXPORT_SYMBOL_GPL(qrtr_endpoint_unregister); | |
643 | ||
644 | /* Lookup socket by port. | |
645 | * | |
646 | * Callers must release with qrtr_port_put() | |
647 | */ | |
648 | static struct qrtr_sock *qrtr_port_lookup(int port) | |
649 | { | |
650 | struct qrtr_sock *ipc; | |
651 | ||
652 | if (port == QRTR_PORT_CTRL) | |
653 | port = 0; | |
654 | ||
f16a4b26 | 655 | rcu_read_lock(); |
bdabad3e CC |
656 | ipc = idr_find(&qrtr_ports, port); |
657 | if (ipc) | |
658 | sock_hold(&ipc->sk); | |
f16a4b26 | 659 | rcu_read_unlock(); |
bdabad3e CC |
660 | |
661 | return ipc; | |
662 | } | |
663 | ||
664 | /* Release acquired socket. */ | |
665 | static void qrtr_port_put(struct qrtr_sock *ipc) | |
666 | { | |
667 | sock_put(&ipc->sk); | |
668 | } | |
669 | ||
670 | /* Remove port assignment. */ | |
671 | static void qrtr_port_remove(struct qrtr_sock *ipc) | |
672 | { | |
1a7959c7 | 673 | struct qrtr_ctrl_pkt *pkt; |
1784473b | 674 | struct sk_buff *skb; |
bdabad3e | 675 | int port = ipc->us.sq_port; |
e7044482 BA |
676 | struct sockaddr_qrtr to; |
677 | ||
678 | to.sq_family = AF_QIPCRTR; | |
679 | to.sq_node = QRTR_NODE_BCAST; | |
680 | to.sq_port = QRTR_PORT_CTRL; | |
bdabad3e | 681 | |
f7dec6cb | 682 | skb = qrtr_alloc_ctrl_packet(&pkt, GFP_KERNEL); |
1784473b | 683 | if (skb) { |
1a7959c7 BA |
684 | pkt->cmd = cpu_to_le32(QRTR_TYPE_DEL_CLIENT); |
685 | pkt->client.node = cpu_to_le32(ipc->us.sq_node); | |
686 | pkt->client.port = cpu_to_le32(ipc->us.sq_port); | |
687 | ||
1784473b | 688 | skb_set_owner_w(skb, &ipc->sk); |
e7044482 BA |
689 | qrtr_bcast_enqueue(NULL, skb, QRTR_TYPE_DEL_CLIENT, &ipc->us, |
690 | &to); | |
1784473b BA |
691 | } |
692 | ||
bdabad3e CC |
693 | if (port == QRTR_PORT_CTRL) |
694 | port = 0; | |
695 | ||
696 | __sock_put(&ipc->sk); | |
697 | ||
698 | mutex_lock(&qrtr_port_lock); | |
699 | idr_remove(&qrtr_ports, port); | |
700 | mutex_unlock(&qrtr_port_lock); | |
f16a4b26 BA |
701 | |
702 | /* Ensure that if qrtr_port_lookup() did enter the RCU read section we | |
703 | * wait for it to up increment the refcount */ | |
704 | synchronize_rcu(); | |
bdabad3e CC |
705 | } |
706 | ||
707 | /* Assign port number to socket. | |
708 | * | |
709 | * Specify port in the integer pointed to by port, and it will be adjusted | |
710 | * on return as necesssary. | |
711 | * | |
712 | * Port may be: | |
713 | * 0: Assign ephemeral port in [QRTR_MIN_EPH_SOCKET, QRTR_MAX_EPH_SOCKET] | |
714 | * <QRTR_MIN_EPH_SOCKET: Specified; requires CAP_NET_ADMIN | |
715 | * >QRTR_MIN_EPH_SOCKET: Specified; available to all | |
716 | */ | |
717 | static int qrtr_port_assign(struct qrtr_sock *ipc, int *port) | |
718 | { | |
8dfddfb7 | 719 | u32 min_port; |
bdabad3e CC |
720 | int rc; |
721 | ||
722 | mutex_lock(&qrtr_port_lock); | |
723 | if (!*port) { | |
8dfddfb7 NFY |
724 | min_port = QRTR_MIN_EPH_SOCKET; |
725 | rc = idr_alloc_u32(&qrtr_ports, ipc, &min_port, QRTR_MAX_EPH_SOCKET, GFP_ATOMIC); | |
726 | if (!rc) | |
727 | *port = min_port; | |
bdabad3e CC |
728 | } else if (*port < QRTR_MIN_EPH_SOCKET && !capable(CAP_NET_ADMIN)) { |
729 | rc = -EACCES; | |
730 | } else if (*port == QRTR_PORT_CTRL) { | |
8dfddfb7 NFY |
731 | min_port = 0; |
732 | rc = idr_alloc_u32(&qrtr_ports, ipc, &min_port, 0, GFP_ATOMIC); | |
bdabad3e | 733 | } else { |
8dfddfb7 NFY |
734 | min_port = *port; |
735 | rc = idr_alloc_u32(&qrtr_ports, ipc, &min_port, *port, GFP_ATOMIC); | |
736 | if (!rc) | |
737 | *port = min_port; | |
bdabad3e CC |
738 | } |
739 | mutex_unlock(&qrtr_port_lock); | |
740 | ||
741 | if (rc == -ENOSPC) | |
742 | return -EADDRINUSE; | |
743 | else if (rc < 0) | |
744 | return rc; | |
745 | ||
746 | sock_hold(&ipc->sk); | |
747 | ||
748 | return 0; | |
749 | } | |
750 | ||
b24844b1 BA |
751 | /* Reset all non-control ports */ |
752 | static void qrtr_reset_ports(void) | |
753 | { | |
754 | struct qrtr_sock *ipc; | |
755 | int id; | |
756 | ||
757 | mutex_lock(&qrtr_port_lock); | |
758 | idr_for_each_entry(&qrtr_ports, ipc, id) { | |
759 | /* Don't reset control port */ | |
760 | if (id == 0) | |
761 | continue; | |
762 | ||
763 | sock_hold(&ipc->sk); | |
764 | ipc->sk.sk_err = ENETRESET; | |
ae85bfa8 | 765 | ipc->sk.sk_error_report(&ipc->sk); |
b24844b1 BA |
766 | sock_put(&ipc->sk); |
767 | } | |
768 | mutex_unlock(&qrtr_port_lock); | |
769 | } | |
770 | ||
bdabad3e CC |
771 | /* Bind socket to address. |
772 | * | |
773 | * Socket should be locked upon call. | |
774 | */ | |
775 | static int __qrtr_bind(struct socket *sock, | |
776 | const struct sockaddr_qrtr *addr, int zapped) | |
777 | { | |
778 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
779 | struct sock *sk = sock->sk; | |
780 | int port; | |
781 | int rc; | |
782 | ||
783 | /* rebinding ok */ | |
784 | if (!zapped && addr->sq_port == ipc->us.sq_port) | |
785 | return 0; | |
786 | ||
787 | port = addr->sq_port; | |
788 | rc = qrtr_port_assign(ipc, &port); | |
789 | if (rc) | |
790 | return rc; | |
791 | ||
792 | /* unbind previous, if any */ | |
793 | if (!zapped) | |
794 | qrtr_port_remove(ipc); | |
795 | ipc->us.sq_port = port; | |
796 | ||
797 | sock_reset_flag(sk, SOCK_ZAPPED); | |
798 | ||
b24844b1 BA |
799 | /* Notify all open ports about the new controller */ |
800 | if (port == QRTR_PORT_CTRL) | |
801 | qrtr_reset_ports(); | |
802 | ||
bdabad3e CC |
803 | return 0; |
804 | } | |
805 | ||
806 | /* Auto bind to an ephemeral port. */ | |
807 | static int qrtr_autobind(struct socket *sock) | |
808 | { | |
809 | struct sock *sk = sock->sk; | |
810 | struct sockaddr_qrtr addr; | |
811 | ||
812 | if (!sock_flag(sk, SOCK_ZAPPED)) | |
813 | return 0; | |
814 | ||
815 | addr.sq_family = AF_QIPCRTR; | |
816 | addr.sq_node = qrtr_local_nid; | |
817 | addr.sq_port = 0; | |
818 | ||
819 | return __qrtr_bind(sock, &addr, 1); | |
820 | } | |
821 | ||
822 | /* Bind socket to specified sockaddr. */ | |
823 | static int qrtr_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
824 | { | |
825 | DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr); | |
826 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
827 | struct sock *sk = sock->sk; | |
828 | int rc; | |
829 | ||
830 | if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR) | |
831 | return -EINVAL; | |
832 | ||
833 | if (addr->sq_node != ipc->us.sq_node) | |
834 | return -EINVAL; | |
835 | ||
836 | lock_sock(sk); | |
837 | rc = __qrtr_bind(sock, addr, sock_flag(sk, SOCK_ZAPPED)); | |
838 | release_sock(sk); | |
839 | ||
840 | return rc; | |
841 | } | |
842 | ||
843 | /* Queue packet to local peer socket. */ | |
e7044482 BA |
844 | static int qrtr_local_enqueue(struct qrtr_node *node, struct sk_buff *skb, |
845 | int type, struct sockaddr_qrtr *from, | |
846 | struct sockaddr_qrtr *to) | |
bdabad3e | 847 | { |
bdabad3e | 848 | struct qrtr_sock *ipc; |
f507a9b6 | 849 | struct qrtr_cb *cb; |
bdabad3e | 850 | |
e7044482 | 851 | ipc = qrtr_port_lookup(to->sq_port); |
bdabad3e CC |
852 | if (!ipc || &ipc->sk == skb->sk) { /* do not send to self */ |
853 | kfree_skb(skb); | |
854 | return -ENODEV; | |
855 | } | |
856 | ||
f507a9b6 BA |
857 | cb = (struct qrtr_cb *)skb->cb; |
858 | cb->src_node = from->sq_node; | |
859 | cb->src_port = from->sq_port; | |
e7044482 | 860 | |
bdabad3e CC |
861 | if (sock_queue_rcv_skb(&ipc->sk, skb)) { |
862 | qrtr_port_put(ipc); | |
863 | kfree_skb(skb); | |
864 | return -ENOSPC; | |
865 | } | |
866 | ||
867 | qrtr_port_put(ipc); | |
868 | ||
869 | return 0; | |
870 | } | |
871 | ||
872 | /* Queue packet for broadcast. */ | |
e7044482 BA |
873 | static int qrtr_bcast_enqueue(struct qrtr_node *node, struct sk_buff *skb, |
874 | int type, struct sockaddr_qrtr *from, | |
875 | struct sockaddr_qrtr *to) | |
bdabad3e CC |
876 | { |
877 | struct sk_buff *skbn; | |
878 | ||
879 | mutex_lock(&qrtr_node_lock); | |
880 | list_for_each_entry(node, &qrtr_all_nodes, item) { | |
881 | skbn = skb_clone(skb, GFP_KERNEL); | |
882 | if (!skbn) | |
883 | break; | |
884 | skb_set_owner_w(skbn, skb->sk); | |
e7044482 | 885 | qrtr_node_enqueue(node, skbn, type, from, to); |
bdabad3e CC |
886 | } |
887 | mutex_unlock(&qrtr_node_lock); | |
888 | ||
d28ea1fb | 889 | qrtr_local_enqueue(NULL, skb, type, from, to); |
bdabad3e CC |
890 | |
891 | return 0; | |
892 | } | |
893 | ||
894 | static int qrtr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) | |
895 | { | |
896 | DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name); | |
e7044482 BA |
897 | int (*enqueue_fn)(struct qrtr_node *, struct sk_buff *, int, |
898 | struct sockaddr_qrtr *, struct sockaddr_qrtr *); | |
8f5e2451 | 899 | __le32 qrtr_type = cpu_to_le32(QRTR_TYPE_DATA); |
bdabad3e CC |
900 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); |
901 | struct sock *sk = sock->sk; | |
902 | struct qrtr_node *node; | |
bdabad3e CC |
903 | struct sk_buff *skb; |
904 | size_t plen; | |
7036e621 | 905 | u32 type; |
bdabad3e CC |
906 | int rc; |
907 | ||
908 | if (msg->msg_flags & ~(MSG_DONTWAIT)) | |
909 | return -EINVAL; | |
910 | ||
911 | if (len > 65535) | |
912 | return -EMSGSIZE; | |
913 | ||
914 | lock_sock(sk); | |
915 | ||
916 | if (addr) { | |
917 | if (msg->msg_namelen < sizeof(*addr)) { | |
918 | release_sock(sk); | |
919 | return -EINVAL; | |
920 | } | |
921 | ||
922 | if (addr->sq_family != AF_QIPCRTR) { | |
923 | release_sock(sk); | |
924 | return -EINVAL; | |
925 | } | |
926 | ||
927 | rc = qrtr_autobind(sock); | |
928 | if (rc) { | |
929 | release_sock(sk); | |
930 | return rc; | |
931 | } | |
932 | } else if (sk->sk_state == TCP_ESTABLISHED) { | |
933 | addr = &ipc->peer; | |
934 | } else { | |
935 | release_sock(sk); | |
936 | return -ENOTCONN; | |
937 | } | |
938 | ||
939 | node = NULL; | |
940 | if (addr->sq_node == QRTR_NODE_BCAST) { | |
6dbf02ac WW |
941 | if (addr->sq_port != QRTR_PORT_CTRL && |
942 | qrtr_local_nid != QRTR_NODE_BCAST) { | |
fdf5fd39 AKN |
943 | release_sock(sk); |
944 | return -ENOTCONN; | |
945 | } | |
6dbf02ac | 946 | enqueue_fn = qrtr_bcast_enqueue; |
bdabad3e CC |
947 | } else if (addr->sq_node == ipc->us.sq_node) { |
948 | enqueue_fn = qrtr_local_enqueue; | |
949 | } else { | |
bdabad3e CC |
950 | node = qrtr_node_lookup(addr->sq_node); |
951 | if (!node) { | |
952 | release_sock(sk); | |
953 | return -ECONNRESET; | |
954 | } | |
6dbf02ac | 955 | enqueue_fn = qrtr_node_enqueue; |
bdabad3e CC |
956 | } |
957 | ||
958 | plen = (len + 3) & ~3; | |
194ccc88 | 959 | skb = sock_alloc_send_skb(sk, plen + QRTR_HDR_MAX_SIZE, |
bdabad3e CC |
960 | msg->msg_flags & MSG_DONTWAIT, &rc); |
961 | if (!skb) | |
962 | goto out_node; | |
963 | ||
194ccc88 | 964 | skb_reserve(skb, QRTR_HDR_MAX_SIZE); |
bdabad3e | 965 | |
e7044482 | 966 | rc = memcpy_from_msg(skb_put(skb, len), msg, len); |
bdabad3e CC |
967 | if (rc) { |
968 | kfree_skb(skb); | |
969 | goto out_node; | |
970 | } | |
971 | ||
bdabad3e CC |
972 | if (ipc->us.sq_port == QRTR_PORT_CTRL) { |
973 | if (len < 4) { | |
974 | rc = -EINVAL; | |
975 | kfree_skb(skb); | |
976 | goto out_node; | |
977 | } | |
978 | ||
979 | /* control messages already require the type as 'command' */ | |
8f5e2451 | 980 | skb_copy_bits(skb, 0, &qrtr_type, 4); |
bdabad3e CC |
981 | } |
982 | ||
7036e621 | 983 | type = le32_to_cpu(qrtr_type); |
e7044482 | 984 | rc = enqueue_fn(node, skb, type, &ipc->us, addr); |
bdabad3e CC |
985 | if (rc >= 0) |
986 | rc = len; | |
987 | ||
988 | out_node: | |
989 | qrtr_node_release(node); | |
990 | release_sock(sk); | |
991 | ||
992 | return rc; | |
993 | } | |
994 | ||
cb6530b9 BA |
995 | static int qrtr_send_resume_tx(struct qrtr_cb *cb) |
996 | { | |
997 | struct sockaddr_qrtr remote = { AF_QIPCRTR, cb->src_node, cb->src_port }; | |
998 | struct sockaddr_qrtr local = { AF_QIPCRTR, cb->dst_node, cb->dst_port }; | |
999 | struct qrtr_ctrl_pkt *pkt; | |
1000 | struct qrtr_node *node; | |
1001 | struct sk_buff *skb; | |
1002 | int ret; | |
1003 | ||
1004 | node = qrtr_node_lookup(remote.sq_node); | |
1005 | if (!node) | |
1006 | return -EINVAL; | |
1007 | ||
f7dec6cb | 1008 | skb = qrtr_alloc_ctrl_packet(&pkt, GFP_KERNEL); |
cb6530b9 BA |
1009 | if (!skb) |
1010 | return -ENOMEM; | |
1011 | ||
1012 | pkt->cmd = cpu_to_le32(QRTR_TYPE_RESUME_TX); | |
1013 | pkt->client.node = cpu_to_le32(cb->dst_node); | |
1014 | pkt->client.port = cpu_to_le32(cb->dst_port); | |
1015 | ||
1016 | ret = qrtr_node_enqueue(node, skb, QRTR_TYPE_RESUME_TX, &local, &remote); | |
1017 | ||
1018 | qrtr_node_release(node); | |
1019 | ||
1020 | return ret; | |
1021 | } | |
1022 | ||
bdabad3e CC |
1023 | static int qrtr_recvmsg(struct socket *sock, struct msghdr *msg, |
1024 | size_t size, int flags) | |
1025 | { | |
1026 | DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, msg->msg_name); | |
bdabad3e CC |
1027 | struct sock *sk = sock->sk; |
1028 | struct sk_buff *skb; | |
f507a9b6 | 1029 | struct qrtr_cb *cb; |
bdabad3e CC |
1030 | int copied, rc; |
1031 | ||
1032 | lock_sock(sk); | |
1033 | ||
1034 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
1035 | release_sock(sk); | |
1036 | return -EADDRNOTAVAIL; | |
1037 | } | |
1038 | ||
1039 | skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT, | |
1040 | flags & MSG_DONTWAIT, &rc); | |
1041 | if (!skb) { | |
1042 | release_sock(sk); | |
1043 | return rc; | |
1044 | } | |
cb6530b9 | 1045 | cb = (struct qrtr_cb *)skb->cb; |
bdabad3e | 1046 | |
f507a9b6 | 1047 | copied = skb->len; |
bdabad3e CC |
1048 | if (copied > size) { |
1049 | copied = size; | |
1050 | msg->msg_flags |= MSG_TRUNC; | |
1051 | } | |
1052 | ||
f507a9b6 | 1053 | rc = skb_copy_datagram_msg(skb, 0, msg, copied); |
bdabad3e CC |
1054 | if (rc < 0) |
1055 | goto out; | |
1056 | rc = copied; | |
1057 | ||
1058 | if (addr) { | |
1059 | addr->sq_family = AF_QIPCRTR; | |
f507a9b6 BA |
1060 | addr->sq_node = cb->src_node; |
1061 | addr->sq_port = cb->src_port; | |
bdabad3e CC |
1062 | msg->msg_namelen = sizeof(*addr); |
1063 | } | |
1064 | ||
1065 | out: | |
cb6530b9 BA |
1066 | if (cb->confirm_rx) |
1067 | qrtr_send_resume_tx(cb); | |
1068 | ||
bdabad3e CC |
1069 | skb_free_datagram(sk, skb); |
1070 | release_sock(sk); | |
1071 | ||
1072 | return rc; | |
1073 | } | |
1074 | ||
1075 | static int qrtr_connect(struct socket *sock, struct sockaddr *saddr, | |
1076 | int len, int flags) | |
1077 | { | |
1078 | DECLARE_SOCKADDR(struct sockaddr_qrtr *, addr, saddr); | |
1079 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
1080 | struct sock *sk = sock->sk; | |
1081 | int rc; | |
1082 | ||
1083 | if (len < sizeof(*addr) || addr->sq_family != AF_QIPCRTR) | |
1084 | return -EINVAL; | |
1085 | ||
1086 | lock_sock(sk); | |
1087 | ||
1088 | sk->sk_state = TCP_CLOSE; | |
1089 | sock->state = SS_UNCONNECTED; | |
1090 | ||
1091 | rc = qrtr_autobind(sock); | |
1092 | if (rc) { | |
1093 | release_sock(sk); | |
1094 | return rc; | |
1095 | } | |
1096 | ||
1097 | ipc->peer = *addr; | |
1098 | sock->state = SS_CONNECTED; | |
1099 | sk->sk_state = TCP_ESTABLISHED; | |
1100 | ||
1101 | release_sock(sk); | |
1102 | ||
1103 | return 0; | |
1104 | } | |
1105 | ||
1106 | static int qrtr_getname(struct socket *sock, struct sockaddr *saddr, | |
9b2c45d4 | 1107 | int peer) |
bdabad3e CC |
1108 | { |
1109 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
1110 | struct sockaddr_qrtr qaddr; | |
1111 | struct sock *sk = sock->sk; | |
1112 | ||
1113 | lock_sock(sk); | |
1114 | if (peer) { | |
1115 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1116 | release_sock(sk); | |
1117 | return -ENOTCONN; | |
1118 | } | |
1119 | ||
1120 | qaddr = ipc->peer; | |
1121 | } else { | |
1122 | qaddr = ipc->us; | |
1123 | } | |
1124 | release_sock(sk); | |
1125 | ||
bdabad3e CC |
1126 | qaddr.sq_family = AF_QIPCRTR; |
1127 | ||
1128 | memcpy(saddr, &qaddr, sizeof(qaddr)); | |
1129 | ||
9b2c45d4 | 1130 | return sizeof(qaddr); |
bdabad3e CC |
1131 | } |
1132 | ||
1133 | static int qrtr_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1134 | { | |
1135 | void __user *argp = (void __user *)arg; | |
1136 | struct qrtr_sock *ipc = qrtr_sk(sock->sk); | |
1137 | struct sock *sk = sock->sk; | |
1138 | struct sockaddr_qrtr *sq; | |
1139 | struct sk_buff *skb; | |
1140 | struct ifreq ifr; | |
1141 | long len = 0; | |
1142 | int rc = 0; | |
1143 | ||
1144 | lock_sock(sk); | |
1145 | ||
1146 | switch (cmd) { | |
1147 | case TIOCOUTQ: | |
1148 | len = sk->sk_sndbuf - sk_wmem_alloc_get(sk); | |
1149 | if (len < 0) | |
1150 | len = 0; | |
1151 | rc = put_user(len, (int __user *)argp); | |
1152 | break; | |
1153 | case TIOCINQ: | |
1154 | skb = skb_peek(&sk->sk_receive_queue); | |
1155 | if (skb) | |
f507a9b6 | 1156 | len = skb->len; |
bdabad3e CC |
1157 | rc = put_user(len, (int __user *)argp); |
1158 | break; | |
1159 | case SIOCGIFADDR: | |
1160 | if (copy_from_user(&ifr, argp, sizeof(ifr))) { | |
1161 | rc = -EFAULT; | |
1162 | break; | |
1163 | } | |
1164 | ||
1165 | sq = (struct sockaddr_qrtr *)&ifr.ifr_addr; | |
1166 | *sq = ipc->us; | |
1167 | if (copy_to_user(argp, &ifr, sizeof(ifr))) { | |
1168 | rc = -EFAULT; | |
1169 | break; | |
1170 | } | |
1171 | break; | |
bdabad3e CC |
1172 | case SIOCADDRT: |
1173 | case SIOCDELRT: | |
1174 | case SIOCSIFADDR: | |
1175 | case SIOCGIFDSTADDR: | |
1176 | case SIOCSIFDSTADDR: | |
1177 | case SIOCGIFBRDADDR: | |
1178 | case SIOCSIFBRDADDR: | |
1179 | case SIOCGIFNETMASK: | |
1180 | case SIOCSIFNETMASK: | |
1181 | rc = -EINVAL; | |
1182 | break; | |
1183 | default: | |
1184 | rc = -ENOIOCTLCMD; | |
1185 | break; | |
1186 | } | |
1187 | ||
1188 | release_sock(sk); | |
1189 | ||
1190 | return rc; | |
1191 | } | |
1192 | ||
1193 | static int qrtr_release(struct socket *sock) | |
1194 | { | |
1195 | struct sock *sk = sock->sk; | |
1196 | struct qrtr_sock *ipc; | |
1197 | ||
1198 | if (!sk) | |
1199 | return 0; | |
1200 | ||
1201 | lock_sock(sk); | |
1202 | ||
1203 | ipc = qrtr_sk(sk); | |
1204 | sk->sk_shutdown = SHUTDOWN_MASK; | |
1205 | if (!sock_flag(sk, SOCK_DEAD)) | |
1206 | sk->sk_state_change(sk); | |
1207 | ||
1208 | sock_set_flag(sk, SOCK_DEAD); | |
af9f691f | 1209 | sock_orphan(sk); |
bdabad3e CC |
1210 | sock->sk = NULL; |
1211 | ||
1212 | if (!sock_flag(sk, SOCK_ZAPPED)) | |
1213 | qrtr_port_remove(ipc); | |
1214 | ||
1215 | skb_queue_purge(&sk->sk_receive_queue); | |
1216 | ||
1217 | release_sock(sk); | |
1218 | sock_put(sk); | |
1219 | ||
1220 | return 0; | |
1221 | } | |
1222 | ||
1223 | static const struct proto_ops qrtr_proto_ops = { | |
1224 | .owner = THIS_MODULE, | |
1225 | .family = AF_QIPCRTR, | |
1226 | .bind = qrtr_bind, | |
1227 | .connect = qrtr_connect, | |
1228 | .socketpair = sock_no_socketpair, | |
1229 | .accept = sock_no_accept, | |
1230 | .listen = sock_no_listen, | |
1231 | .sendmsg = qrtr_sendmsg, | |
1232 | .recvmsg = qrtr_recvmsg, | |
1233 | .getname = qrtr_getname, | |
1234 | .ioctl = qrtr_ioctl, | |
c7cbdbf2 | 1235 | .gettstamp = sock_gettstamp, |
a11e1d43 | 1236 | .poll = datagram_poll, |
bdabad3e | 1237 | .shutdown = sock_no_shutdown, |
bdabad3e CC |
1238 | .release = qrtr_release, |
1239 | .mmap = sock_no_mmap, | |
1240 | .sendpage = sock_no_sendpage, | |
1241 | }; | |
1242 | ||
1243 | static struct proto qrtr_proto = { | |
1244 | .name = "QIPCRTR", | |
1245 | .owner = THIS_MODULE, | |
1246 | .obj_size = sizeof(struct qrtr_sock), | |
1247 | }; | |
1248 | ||
1249 | static int qrtr_create(struct net *net, struct socket *sock, | |
1250 | int protocol, int kern) | |
1251 | { | |
1252 | struct qrtr_sock *ipc; | |
1253 | struct sock *sk; | |
1254 | ||
1255 | if (sock->type != SOCK_DGRAM) | |
1256 | return -EPROTOTYPE; | |
1257 | ||
1258 | sk = sk_alloc(net, AF_QIPCRTR, GFP_KERNEL, &qrtr_proto, kern); | |
1259 | if (!sk) | |
1260 | return -ENOMEM; | |
1261 | ||
1262 | sock_set_flag(sk, SOCK_ZAPPED); | |
1263 | ||
1264 | sock_init_data(sock, sk); | |
1265 | sock->ops = &qrtr_proto_ops; | |
1266 | ||
1267 | ipc = qrtr_sk(sk); | |
1268 | ipc->us.sq_family = AF_QIPCRTR; | |
1269 | ipc->us.sq_node = qrtr_local_nid; | |
1270 | ipc->us.sq_port = 0; | |
1271 | ||
1272 | return 0; | |
1273 | } | |
1274 | ||
bdabad3e CC |
1275 | static const struct net_proto_family qrtr_family = { |
1276 | .owner = THIS_MODULE, | |
1277 | .family = AF_QIPCRTR, | |
1278 | .create = qrtr_create, | |
1279 | }; | |
1280 | ||
1281 | static int __init qrtr_proto_init(void) | |
1282 | { | |
1283 | int rc; | |
1284 | ||
1285 | rc = proto_register(&qrtr_proto, 1); | |
1286 | if (rc) | |
1287 | return rc; | |
1288 | ||
1289 | rc = sock_register(&qrtr_family); | |
4beb17e5 QM |
1290 | if (rc) |
1291 | goto err_proto; | |
bdabad3e | 1292 | |
4beb17e5 QM |
1293 | rc = qrtr_ns_init(); |
1294 | if (rc) | |
1295 | goto err_sock; | |
bdabad3e | 1296 | |
4beb17e5 QM |
1297 | return 0; |
1298 | ||
1299 | err_sock: | |
1300 | sock_unregister(qrtr_family.family); | |
1301 | err_proto: | |
1302 | proto_unregister(&qrtr_proto); | |
c1c502b5 | 1303 | return rc; |
bdabad3e | 1304 | } |
b7e732fa | 1305 | postcore_initcall(qrtr_proto_init); |
bdabad3e CC |
1306 | |
1307 | static void __exit qrtr_proto_fini(void) | |
1308 | { | |
0c2204a4 | 1309 | qrtr_ns_remove(); |
bdabad3e CC |
1310 | sock_unregister(qrtr_family.family); |
1311 | proto_unregister(&qrtr_proto); | |
1312 | } | |
1313 | module_exit(qrtr_proto_fini); | |
1314 | ||
1315 | MODULE_DESCRIPTION("Qualcomm IPC-router driver"); | |
1316 | MODULE_LICENSE("GPL v2"); | |
77ac725e | 1317 | MODULE_ALIAS_NETPROTO(PF_QIPCRTR); |