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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
17926a79 DH |
2 | /* RxRPC recvmsg() implementation |
3 | * | |
4 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
5 | * Written by David Howells (dhowells@redhat.com) | |
17926a79 DH |
6 | */ |
7 | ||
9b6d5398 JP |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | ||
17926a79 DH |
10 | #include <linux/net.h> |
11 | #include <linux/skbuff.h> | |
bc3b2d7f | 12 | #include <linux/export.h> |
174cd4b1 IM |
13 | #include <linux/sched/signal.h> |
14 | ||
17926a79 DH |
15 | #include <net/sock.h> |
16 | #include <net/af_rxrpc.h> | |
17 | #include "ar-internal.h" | |
18 | ||
17926a79 | 19 | /* |
248f219c DH |
20 | * Post a call for attention by the socket or kernel service. Further |
21 | * notifications are suppressed by putting recvmsg_link on a dummy queue. | |
17926a79 | 22 | */ |
248f219c | 23 | void rxrpc_notify_socket(struct rxrpc_call *call) |
17926a79 | 24 | { |
248f219c DH |
25 | struct rxrpc_sock *rx; |
26 | struct sock *sk; | |
17926a79 | 27 | |
248f219c | 28 | _enter("%d", call->debug_id); |
17926a79 | 29 | |
248f219c DH |
30 | if (!list_empty(&call->recvmsg_link)) |
31 | return; | |
32 | ||
33 | rcu_read_lock(); | |
34 | ||
35 | rx = rcu_dereference(call->socket); | |
36 | sk = &rx->sk; | |
37 | if (rx && sk->sk_state < RXRPC_CLOSE) { | |
38 | if (call->notify_rx) { | |
20acbd9a | 39 | spin_lock_bh(&call->notify_lock); |
248f219c | 40 | call->notify_rx(sk, call, call->user_call_ID); |
20acbd9a | 41 | spin_unlock_bh(&call->notify_lock); |
248f219c DH |
42 | } else { |
43 | write_lock_bh(&rx->recvmsg_lock); | |
44 | if (list_empty(&call->recvmsg_link)) { | |
45 | rxrpc_get_call(call, rxrpc_call_got); | |
46 | list_add_tail(&call->recvmsg_link, &rx->recvmsg_q); | |
47 | } | |
48 | write_unlock_bh(&rx->recvmsg_lock); | |
17926a79 | 49 | |
248f219c DH |
50 | if (!sock_flag(sk, SOCK_DEAD)) { |
51 | _debug("call %ps", sk->sk_data_ready); | |
52 | sk->sk_data_ready(sk); | |
53 | } | |
54 | } | |
55 | } | |
17926a79 | 56 | |
248f219c DH |
57 | rcu_read_unlock(); |
58 | _leave(""); | |
59 | } | |
17926a79 | 60 | |
3067bf8c DH |
61 | /* |
62 | * Transition a call to the complete state. | |
63 | */ | |
64 | bool __rxrpc_set_call_completion(struct rxrpc_call *call, | |
65 | enum rxrpc_call_completion compl, | |
66 | u32 abort_code, | |
67 | int error) | |
68 | { | |
69 | if (call->state < RXRPC_CALL_COMPLETE) { | |
70 | call->abort_code = abort_code; | |
71 | call->error = error; | |
a319aedd | 72 | call->completion = compl; |
3067bf8c DH |
73 | call->state = RXRPC_CALL_COMPLETE; |
74 | trace_rxrpc_call_complete(call); | |
75 | wake_up(&call->waitq); | |
5ac0d622 | 76 | rxrpc_notify_socket(call); |
3067bf8c DH |
77 | return true; |
78 | } | |
79 | return false; | |
80 | } | |
81 | ||
82 | bool rxrpc_set_call_completion(struct rxrpc_call *call, | |
83 | enum rxrpc_call_completion compl, | |
84 | u32 abort_code, | |
85 | int error) | |
86 | { | |
5ac0d622 | 87 | bool ret = false; |
3067bf8c | 88 | |
5ac0d622 DH |
89 | if (call->state < RXRPC_CALL_COMPLETE) { |
90 | write_lock_bh(&call->state_lock); | |
91 | ret = __rxrpc_set_call_completion(call, compl, abort_code, error); | |
92 | write_unlock_bh(&call->state_lock); | |
93 | } | |
3067bf8c DH |
94 | return ret; |
95 | } | |
96 | ||
97 | /* | |
98 | * Record that a call successfully completed. | |
99 | */ | |
100 | bool __rxrpc_call_completed(struct rxrpc_call *call) | |
101 | { | |
102 | return __rxrpc_set_call_completion(call, RXRPC_CALL_SUCCEEDED, 0, 0); | |
103 | } | |
104 | ||
105 | bool rxrpc_call_completed(struct rxrpc_call *call) | |
106 | { | |
5ac0d622 | 107 | bool ret = false; |
3067bf8c | 108 | |
5ac0d622 DH |
109 | if (call->state < RXRPC_CALL_COMPLETE) { |
110 | write_lock_bh(&call->state_lock); | |
111 | ret = __rxrpc_call_completed(call); | |
112 | write_unlock_bh(&call->state_lock); | |
113 | } | |
3067bf8c DH |
114 | return ret; |
115 | } | |
116 | ||
117 | /* | |
118 | * Record that a call is locally aborted. | |
119 | */ | |
120 | bool __rxrpc_abort_call(const char *why, struct rxrpc_call *call, | |
121 | rxrpc_seq_t seq, u32 abort_code, int error) | |
122 | { | |
123 | trace_rxrpc_abort(call->debug_id, why, call->cid, call->call_id, seq, | |
124 | abort_code, error); | |
125 | return __rxrpc_set_call_completion(call, RXRPC_CALL_LOCALLY_ABORTED, | |
126 | abort_code, error); | |
127 | } | |
128 | ||
129 | bool rxrpc_abort_call(const char *why, struct rxrpc_call *call, | |
130 | rxrpc_seq_t seq, u32 abort_code, int error) | |
131 | { | |
132 | bool ret; | |
133 | ||
134 | write_lock_bh(&call->state_lock); | |
135 | ret = __rxrpc_abort_call(why, call, seq, abort_code, error); | |
136 | write_unlock_bh(&call->state_lock); | |
137 | return ret; | |
138 | } | |
139 | ||
248f219c DH |
140 | /* |
141 | * Pass a call terminating message to userspace. | |
142 | */ | |
143 | static int rxrpc_recvmsg_term(struct rxrpc_call *call, struct msghdr *msg) | |
144 | { | |
145 | u32 tmp = 0; | |
146 | int ret; | |
17926a79 | 147 | |
248f219c DH |
148 | switch (call->completion) { |
149 | case RXRPC_CALL_SUCCEEDED: | |
150 | ret = 0; | |
151 | if (rxrpc_is_service_call(call)) | |
152 | ret = put_cmsg(msg, SOL_RXRPC, RXRPC_ACK, 0, &tmp); | |
153 | break; | |
154 | case RXRPC_CALL_REMOTELY_ABORTED: | |
155 | tmp = call->abort_code; | |
156 | ret = put_cmsg(msg, SOL_RXRPC, RXRPC_ABORT, 4, &tmp); | |
157 | break; | |
158 | case RXRPC_CALL_LOCALLY_ABORTED: | |
159 | tmp = call->abort_code; | |
160 | ret = put_cmsg(msg, SOL_RXRPC, RXRPC_ABORT, 4, &tmp); | |
161 | break; | |
162 | case RXRPC_CALL_NETWORK_ERROR: | |
3a92789a | 163 | tmp = -call->error; |
248f219c DH |
164 | ret = put_cmsg(msg, SOL_RXRPC, RXRPC_NET_ERROR, 4, &tmp); |
165 | break; | |
166 | case RXRPC_CALL_LOCAL_ERROR: | |
3a92789a | 167 | tmp = -call->error; |
248f219c DH |
168 | ret = put_cmsg(msg, SOL_RXRPC, RXRPC_LOCAL_ERROR, 4, &tmp); |
169 | break; | |
170 | default: | |
171 | pr_err("Invalid terminal call state %u\n", call->state); | |
172 | BUG(); | |
173 | break; | |
174 | } | |
17926a79 | 175 | |
84997905 DH |
176 | trace_rxrpc_recvmsg(call, rxrpc_recvmsg_terminal, call->rx_hard_ack, |
177 | call->rx_pkt_offset, call->rx_pkt_len, ret); | |
248f219c DH |
178 | return ret; |
179 | } | |
17926a79 | 180 | |
248f219c DH |
181 | /* |
182 | * End the packet reception phase. | |
183 | */ | |
b69d94d7 | 184 | static void rxrpc_end_rx_phase(struct rxrpc_call *call, rxrpc_serial_t serial) |
248f219c DH |
185 | { |
186 | _enter("%d,%s", call->debug_id, rxrpc_call_states[call->state]); | |
17926a79 | 187 | |
58dc63c9 | 188 | trace_rxrpc_receive(call, rxrpc_receive_end, 0, call->rx_top); |
816c9fce DH |
189 | ASSERTCMP(call->rx_hard_ack, ==, call->rx_top); |
190 | ||
248f219c | 191 | if (call->state == RXRPC_CALL_CLIENT_RECV_REPLY) { |
e8c3af6b | 192 | rxrpc_propose_ACK(call, RXRPC_ACK_IDLE, serial, false, true, |
9c7ad434 | 193 | rxrpc_propose_ack_terminal_ack); |
a71a2651 | 194 | //rxrpc_send_ack_packet(call, false, NULL); |
248f219c | 195 | } |
17926a79 | 196 | |
248f219c | 197 | write_lock_bh(&call->state_lock); |
17926a79 | 198 | |
248f219c DH |
199 | switch (call->state) { |
200 | case RXRPC_CALL_CLIENT_RECV_REPLY: | |
201 | __rxrpc_call_completed(call); | |
9749fd2b | 202 | write_unlock_bh(&call->state_lock); |
248f219c | 203 | break; |
17926a79 | 204 | |
248f219c | 205 | case RXRPC_CALL_SERVER_RECV_REQUEST: |
71f3ca40 | 206 | call->tx_phase = true; |
248f219c | 207 | call->state = RXRPC_CALL_SERVER_ACK_REQUEST; |
a158bdd3 | 208 | call->expect_req_by = jiffies + MAX_JIFFY_OFFSET; |
9749fd2b | 209 | write_unlock_bh(&call->state_lock); |
e8c3af6b | 210 | rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, serial, false, true, |
9749fd2b | 211 | rxrpc_propose_ack_processing_op); |
248f219c DH |
212 | break; |
213 | default: | |
9749fd2b | 214 | write_unlock_bh(&call->state_lock); |
248f219c DH |
215 | break; |
216 | } | |
248f219c | 217 | } |
17926a79 | 218 | |
248f219c DH |
219 | /* |
220 | * Discard a packet we've used up and advance the Rx window by one. | |
221 | */ | |
222 | static void rxrpc_rotate_rx_window(struct rxrpc_call *call) | |
223 | { | |
816c9fce | 224 | struct rxrpc_skb_priv *sp; |
248f219c | 225 | struct sk_buff *skb; |
58dc63c9 | 226 | rxrpc_serial_t serial; |
248f219c | 227 | rxrpc_seq_t hard_ack, top; |
e2de6c40 DH |
228 | bool last = false; |
229 | u8 subpacket; | |
248f219c DH |
230 | int ix; |
231 | ||
232 | _enter("%d", call->debug_id); | |
233 | ||
234 | hard_ack = call->rx_hard_ack; | |
235 | top = smp_load_acquire(&call->rx_top); | |
236 | ASSERT(before(hard_ack, top)); | |
237 | ||
238 | hard_ack++; | |
239 | ix = hard_ack & RXRPC_RXTX_BUFF_MASK; | |
240 | skb = call->rxtx_buffer[ix]; | |
987db9f7 | 241 | rxrpc_see_skb(skb, rxrpc_skb_rotated); |
816c9fce | 242 | sp = rxrpc_skb(skb); |
e2de6c40 DH |
243 | |
244 | subpacket = call->rxtx_annotations[ix] & RXRPC_RX_ANNO_SUBPACKET; | |
245 | serial = sp->hdr.serial + subpacket; | |
246 | ||
247 | if (subpacket == sp->nr_subpackets - 1 && | |
248 | sp->rx_flags & RXRPC_SKB_INCL_LAST) | |
249 | last = true; | |
58dc63c9 | 250 | |
248f219c DH |
251 | call->rxtx_buffer[ix] = NULL; |
252 | call->rxtx_annotations[ix] = 0; | |
253 | /* Barrier against rxrpc_input_data(). */ | |
254 | smp_store_release(&call->rx_hard_ack, hard_ack); | |
17926a79 | 255 | |
987db9f7 | 256 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
17926a79 | 257 | |
58dc63c9 | 258 | trace_rxrpc_receive(call, rxrpc_receive_rotate, serial, hard_ack); |
e2de6c40 | 259 | if (last) { |
b69d94d7 | 260 | rxrpc_end_rx_phase(call, serial); |
805b21b9 DH |
261 | } else { |
262 | /* Check to see if there's an ACK that needs sending. */ | |
263 | if (after_eq(hard_ack, call->ackr_consumed + 2) || | |
264 | after_eq(top, call->ackr_seen + 2) || | |
265 | (hard_ack == top && after(hard_ack, call->ackr_consumed))) | |
e8c3af6b | 266 | rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, serial, |
8637abaa | 267 | true, true, |
805b21b9 | 268 | rxrpc_propose_ack_rotate_rx); |
8637abaa | 269 | if (call->ackr_reason && call->ackr_reason != RXRPC_ACK_DELAY) |
bd1fdf8c | 270 | rxrpc_send_ack_packet(call, false, NULL); |
805b21b9 | 271 | } |
248f219c DH |
272 | } |
273 | ||
274 | /* | |
275 | * Decrypt and verify a (sub)packet. The packet's length may be changed due to | |
276 | * padding, but if this is the case, the packet length will be resident in the | |
277 | * socket buffer. Note that we can't modify the master skb info as the skb may | |
278 | * be the home to multiple subpackets. | |
279 | */ | |
280 | static int rxrpc_verify_packet(struct rxrpc_call *call, struct sk_buff *skb, | |
281 | u8 annotation, | |
282 | unsigned int offset, unsigned int len) | |
283 | { | |
284 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
285 | rxrpc_seq_t seq = sp->hdr.seq; | |
286 | u16 cksum = sp->hdr.cksum; | |
e2de6c40 | 287 | u8 subpacket = annotation & RXRPC_RX_ANNO_SUBPACKET; |
248f219c DH |
288 | |
289 | _enter(""); | |
290 | ||
291 | /* For all but the head jumbo subpacket, the security checksum is in a | |
292 | * jumbo header immediately prior to the data. | |
293 | */ | |
e2de6c40 | 294 | if (subpacket > 0) { |
248f219c DH |
295 | __be16 tmp; |
296 | if (skb_copy_bits(skb, offset - 2, &tmp, 2) < 0) | |
297 | BUG(); | |
298 | cksum = ntohs(tmp); | |
e2de6c40 | 299 | seq += subpacket; |
248f219c DH |
300 | } |
301 | ||
91fcfbe8 DH |
302 | return call->security->verify_packet(call, skb, offset, len, |
303 | seq, cksum); | |
248f219c DH |
304 | } |
305 | ||
306 | /* | |
307 | * Locate the data within a packet. This is complicated by: | |
308 | * | |
309 | * (1) An skb may contain a jumbo packet - so we have to find the appropriate | |
310 | * subpacket. | |
311 | * | |
312 | * (2) The (sub)packets may be encrypted and, if so, the encrypted portion | |
313 | * contains an extra header which includes the true length of the data, | |
314 | * excluding any encrypted padding. | |
315 | */ | |
316 | static int rxrpc_locate_data(struct rxrpc_call *call, struct sk_buff *skb, | |
317 | u8 *_annotation, | |
f9c32435 DH |
318 | unsigned int *_offset, unsigned int *_len, |
319 | bool *_last) | |
248f219c | 320 | { |
e2de6c40 | 321 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
775e5b71 | 322 | unsigned int offset = sizeof(struct rxrpc_wire_header); |
650b4eca | 323 | unsigned int len; |
f9c32435 | 324 | bool last = false; |
248f219c DH |
325 | int ret; |
326 | u8 annotation = *_annotation; | |
e2de6c40 | 327 | u8 subpacket = annotation & RXRPC_RX_ANNO_SUBPACKET; |
248f219c | 328 | |
248f219c | 329 | /* Locate the subpacket */ |
e2de6c40 | 330 | offset += subpacket * RXRPC_JUMBO_SUBPKTLEN; |
775e5b71 | 331 | len = skb->len - offset; |
e2de6c40 DH |
332 | if (subpacket < sp->nr_subpackets - 1) |
333 | len = RXRPC_JUMBO_DATALEN; | |
f9c32435 DH |
334 | else if (sp->rx_flags & RXRPC_SKB_INCL_LAST) |
335 | last = true; | |
248f219c DH |
336 | |
337 | if (!(annotation & RXRPC_RX_ANNO_VERIFIED)) { | |
338 | ret = rxrpc_verify_packet(call, skb, annotation, offset, len); | |
17926a79 | 339 | if (ret < 0) |
248f219c DH |
340 | return ret; |
341 | *_annotation |= RXRPC_RX_ANNO_VERIFIED; | |
342 | } | |
17926a79 | 343 | |
248f219c DH |
344 | *_offset = offset; |
345 | *_len = len; | |
f9c32435 | 346 | *_last = last; |
91fcfbe8 | 347 | call->security->locate_data(call, skb, _offset, _len); |
248f219c DH |
348 | return 0; |
349 | } | |
17926a79 | 350 | |
248f219c DH |
351 | /* |
352 | * Deliver messages to a call. This keeps processing packets until the buffer | |
353 | * is filled and we find either more DATA (returns 0) or the end of the DATA | |
354 | * (returns 1). If more packets are required, it returns -EAGAIN. | |
355 | */ | |
356 | static int rxrpc_recvmsg_data(struct socket *sock, struct rxrpc_call *call, | |
357 | struct msghdr *msg, struct iov_iter *iter, | |
358 | size_t len, int flags, size_t *_offset) | |
359 | { | |
360 | struct rxrpc_skb_priv *sp; | |
361 | struct sk_buff *skb; | |
e2de6c40 | 362 | rxrpc_serial_t serial; |
248f219c DH |
363 | rxrpc_seq_t hard_ack, top, seq; |
364 | size_t remain; | |
f9c32435 | 365 | bool rx_pkt_last; |
248f219c | 366 | unsigned int rx_pkt_offset, rx_pkt_len; |
816c9fce | 367 | int ix, copy, ret = -EAGAIN, ret2; |
248f219c | 368 | |
d0b35a42 DH |
369 | if (test_and_clear_bit(RXRPC_CALL_RX_UNDERRUN, &call->flags) && |
370 | call->ackr_reason) | |
371 | rxrpc_send_ack_packet(call, false, NULL); | |
372 | ||
248f219c DH |
373 | rx_pkt_offset = call->rx_pkt_offset; |
374 | rx_pkt_len = call->rx_pkt_len; | |
f9c32435 | 375 | rx_pkt_last = call->rx_pkt_last; |
248f219c | 376 | |
816c9fce DH |
377 | if (call->state >= RXRPC_CALL_SERVER_ACK_REQUEST) { |
378 | seq = call->rx_hard_ack; | |
379 | ret = 1; | |
380 | goto done; | |
381 | } | |
382 | ||
248f219c DH |
383 | /* Barriers against rxrpc_input_data(). */ |
384 | hard_ack = call->rx_hard_ack; | |
d7e15835 | 385 | seq = hard_ack + 1; |
f9c32435 | 386 | |
d7e15835 DH |
387 | while (top = smp_load_acquire(&call->rx_top), |
388 | before_eq(seq, top) | |
389 | ) { | |
248f219c DH |
390 | ix = seq & RXRPC_RXTX_BUFF_MASK; |
391 | skb = call->rxtx_buffer[ix]; | |
84997905 DH |
392 | if (!skb) { |
393 | trace_rxrpc_recvmsg(call, rxrpc_recvmsg_hole, seq, | |
394 | rx_pkt_offset, rx_pkt_len, 0); | |
248f219c | 395 | break; |
84997905 | 396 | } |
248f219c | 397 | smp_rmb(); |
987db9f7 | 398 | rxrpc_see_skb(skb, rxrpc_skb_seen); |
248f219c | 399 | sp = rxrpc_skb(skb); |
17926a79 | 400 | |
e2de6c40 DH |
401 | if (!(flags & MSG_PEEK)) { |
402 | serial = sp->hdr.serial; | |
403 | serial += call->rxtx_annotations[ix] & RXRPC_RX_ANNO_SUBPACKET; | |
58dc63c9 | 404 | trace_rxrpc_receive(call, rxrpc_receive_front, |
e2de6c40 DH |
405 | serial, seq); |
406 | } | |
58dc63c9 | 407 | |
248f219c DH |
408 | if (msg) |
409 | sock_recv_timestamp(msg, sock->sk, skb); | |
410 | ||
2e2ea51d | 411 | if (rx_pkt_offset == 0) { |
816c9fce DH |
412 | ret2 = rxrpc_locate_data(call, skb, |
413 | &call->rxtx_annotations[ix], | |
f9c32435 DH |
414 | &rx_pkt_offset, &rx_pkt_len, |
415 | &rx_pkt_last); | |
84997905 DH |
416 | trace_rxrpc_recvmsg(call, rxrpc_recvmsg_next, seq, |
417 | rx_pkt_offset, rx_pkt_len, ret2); | |
816c9fce DH |
418 | if (ret2 < 0) { |
419 | ret = ret2; | |
2e2ea51d | 420 | goto out; |
816c9fce | 421 | } |
84997905 DH |
422 | } else { |
423 | trace_rxrpc_recvmsg(call, rxrpc_recvmsg_cont, seq, | |
424 | rx_pkt_offset, rx_pkt_len, 0); | |
2e2ea51d | 425 | } |
248f219c DH |
426 | |
427 | /* We have to handle short, empty and used-up DATA packets. */ | |
428 | remain = len - *_offset; | |
429 | copy = rx_pkt_len; | |
430 | if (copy > remain) | |
431 | copy = remain; | |
432 | if (copy > 0) { | |
816c9fce DH |
433 | ret2 = skb_copy_datagram_iter(skb, rx_pkt_offset, iter, |
434 | copy); | |
435 | if (ret2 < 0) { | |
436 | ret = ret2; | |
248f219c | 437 | goto out; |
816c9fce | 438 | } |
248f219c DH |
439 | |
440 | /* handle piecemeal consumption of data packets */ | |
248f219c DH |
441 | rx_pkt_offset += copy; |
442 | rx_pkt_len -= copy; | |
443 | *_offset += copy; | |
444 | } | |
17926a79 | 445 | |
248f219c | 446 | if (rx_pkt_len > 0) { |
84997905 DH |
447 | trace_rxrpc_recvmsg(call, rxrpc_recvmsg_full, seq, |
448 | rx_pkt_offset, rx_pkt_len, 0); | |
248f219c | 449 | ASSERTCMP(*_offset, ==, len); |
816c9fce | 450 | ret = 0; |
17926a79 DH |
451 | break; |
452 | } | |
453 | ||
248f219c | 454 | /* The whole packet has been transferred. */ |
372ee163 | 455 | if (!(flags & MSG_PEEK)) |
248f219c DH |
456 | rxrpc_rotate_rx_window(call); |
457 | rx_pkt_offset = 0; | |
458 | rx_pkt_len = 0; | |
17926a79 | 459 | |
f9c32435 | 460 | if (rx_pkt_last) { |
816c9fce | 461 | ASSERTCMP(seq, ==, READ_ONCE(call->rx_top)); |
248f219c | 462 | ret = 1; |
816c9fce DH |
463 | goto out; |
464 | } | |
d7e15835 DH |
465 | |
466 | seq++; | |
248f219c | 467 | } |
816c9fce | 468 | |
248f219c DH |
469 | out: |
470 | if (!(flags & MSG_PEEK)) { | |
471 | call->rx_pkt_offset = rx_pkt_offset; | |
472 | call->rx_pkt_len = rx_pkt_len; | |
f9c32435 | 473 | call->rx_pkt_last = rx_pkt_last; |
248f219c | 474 | } |
816c9fce | 475 | done: |
84997905 DH |
476 | trace_rxrpc_recvmsg(call, rxrpc_recvmsg_data_return, seq, |
477 | rx_pkt_offset, rx_pkt_len, ret); | |
d0b35a42 DH |
478 | if (ret == -EAGAIN) |
479 | set_bit(RXRPC_CALL_RX_UNDERRUN, &call->flags); | |
248f219c DH |
480 | return ret; |
481 | } | |
17926a79 | 482 | |
248f219c DH |
483 | /* |
484 | * Receive a message from an RxRPC socket | |
485 | * - we need to be careful about two or more threads calling recvmsg | |
486 | * simultaneously | |
487 | */ | |
488 | int rxrpc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, | |
489 | int flags) | |
490 | { | |
491 | struct rxrpc_call *call; | |
492 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
493 | struct list_head *l; | |
494 | size_t copied = 0; | |
495 | long timeo; | |
496 | int ret; | |
497 | ||
498 | DEFINE_WAIT(wait); | |
499 | ||
84997905 | 500 | trace_rxrpc_recvmsg(NULL, rxrpc_recvmsg_enter, 0, 0, 0, 0); |
248f219c DH |
501 | |
502 | if (flags & (MSG_OOB | MSG_TRUNC)) | |
503 | return -EOPNOTSUPP; | |
504 | ||
505 | timeo = sock_rcvtimeo(&rx->sk, flags & MSG_DONTWAIT); | |
506 | ||
507 | try_again: | |
508 | lock_sock(&rx->sk); | |
509 | ||
510 | /* Return immediately if a client socket has no outstanding calls */ | |
511 | if (RB_EMPTY_ROOT(&rx->calls) && | |
512 | list_empty(&rx->recvmsg_q) && | |
513 | rx->sk.sk_state != RXRPC_SERVER_LISTENING) { | |
514 | release_sock(&rx->sk); | |
639f181f | 515 | return -EAGAIN; |
17926a79 DH |
516 | } |
517 | ||
248f219c DH |
518 | if (list_empty(&rx->recvmsg_q)) { |
519 | ret = -EWOULDBLOCK; | |
84997905 DH |
520 | if (timeo == 0) { |
521 | call = NULL; | |
248f219c | 522 | goto error_no_call; |
84997905 | 523 | } |
248f219c DH |
524 | |
525 | release_sock(&rx->sk); | |
526 | ||
527 | /* Wait for something to happen */ | |
528 | prepare_to_wait_exclusive(sk_sleep(&rx->sk), &wait, | |
529 | TASK_INTERRUPTIBLE); | |
530 | ret = sock_error(&rx->sk); | |
531 | if (ret) | |
532 | goto wait_error; | |
533 | ||
534 | if (list_empty(&rx->recvmsg_q)) { | |
535 | if (signal_pending(current)) | |
536 | goto wait_interrupted; | |
84997905 DH |
537 | trace_rxrpc_recvmsg(NULL, rxrpc_recvmsg_wait, |
538 | 0, 0, 0, 0); | |
248f219c | 539 | timeo = schedule_timeout(timeo); |
17926a79 | 540 | } |
248f219c DH |
541 | finish_wait(sk_sleep(&rx->sk), &wait); |
542 | goto try_again; | |
17926a79 DH |
543 | } |
544 | ||
248f219c DH |
545 | /* Find the next call and dequeue it if we're not just peeking. If we |
546 | * do dequeue it, that comes with a ref that we will need to release. | |
547 | */ | |
548 | write_lock_bh(&rx->recvmsg_lock); | |
549 | l = rx->recvmsg_q.next; | |
550 | call = list_entry(l, struct rxrpc_call, recvmsg_link); | |
551 | if (!(flags & MSG_PEEK)) | |
552 | list_del_init(&call->recvmsg_link); | |
553 | else | |
554 | rxrpc_get_call(call, rxrpc_call_got); | |
555 | write_unlock_bh(&rx->recvmsg_lock); | |
17926a79 | 556 | |
84997905 | 557 | trace_rxrpc_recvmsg(call, rxrpc_recvmsg_dequeue, 0, 0, 0, 0); |
248f219c | 558 | |
540b1c48 DH |
559 | /* We're going to drop the socket lock, so we need to lock the call |
560 | * against interference by sendmsg. | |
561 | */ | |
562 | if (!mutex_trylock(&call->user_mutex)) { | |
563 | ret = -EWOULDBLOCK; | |
564 | if (flags & MSG_DONTWAIT) | |
565 | goto error_requeue_call; | |
566 | ret = -ERESTARTSYS; | |
567 | if (mutex_lock_interruptible(&call->user_mutex) < 0) | |
568 | goto error_requeue_call; | |
569 | } | |
570 | ||
571 | release_sock(&rx->sk); | |
572 | ||
248f219c | 573 | if (test_bit(RXRPC_CALL_RELEASED, &call->flags)) |
17926a79 | 574 | BUG(); |
248f219c DH |
575 | |
576 | if (test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
577 | if (flags & MSG_CMSG_COMPAT) { | |
578 | unsigned int id32 = call->user_call_ID; | |
579 | ||
580 | ret = put_cmsg(msg, SOL_RXRPC, RXRPC_USER_CALL_ID, | |
581 | sizeof(unsigned int), &id32); | |
582 | } else { | |
a16b8d0c DH |
583 | unsigned long idl = call->user_call_ID; |
584 | ||
248f219c | 585 | ret = put_cmsg(msg, SOL_RXRPC, RXRPC_USER_CALL_ID, |
a16b8d0c | 586 | sizeof(unsigned long), &idl); |
f5c17aae | 587 | } |
248f219c | 588 | if (ret < 0) |
540b1c48 | 589 | goto error_unlock_call; |
248f219c DH |
590 | } |
591 | ||
65550098 | 592 | if (msg->msg_name && call->peer) { |
68d6d1ae DH |
593 | struct sockaddr_rxrpc *srx = msg->msg_name; |
594 | size_t len = sizeof(call->peer->srx); | |
595 | ||
596 | memcpy(msg->msg_name, &call->peer->srx, len); | |
597 | srx->srx_service = call->service_id; | |
248f219c DH |
598 | msg->msg_namelen = len; |
599 | } | |
600 | ||
146d8fef | 601 | switch (READ_ONCE(call->state)) { |
248f219c DH |
602 | case RXRPC_CALL_CLIENT_RECV_REPLY: |
603 | case RXRPC_CALL_SERVER_RECV_REQUEST: | |
604 | case RXRPC_CALL_SERVER_ACK_REQUEST: | |
605 | ret = rxrpc_recvmsg_data(sock, call, msg, &msg->msg_iter, len, | |
606 | flags, &copied); | |
607 | if (ret == -EAGAIN) | |
608 | ret = 0; | |
33b603fd DH |
609 | |
610 | if (after(call->rx_top, call->rx_hard_ack) && | |
611 | call->rxtx_buffer[(call->rx_hard_ack + 1) & RXRPC_RXTX_BUFF_MASK]) | |
612 | rxrpc_notify_socket(call); | |
17926a79 DH |
613 | break; |
614 | default: | |
248f219c | 615 | ret = 0; |
17926a79 DH |
616 | break; |
617 | } | |
618 | ||
619 | if (ret < 0) | |
540b1c48 | 620 | goto error_unlock_call; |
17926a79 | 621 | |
248f219c DH |
622 | if (call->state == RXRPC_CALL_COMPLETE) { |
623 | ret = rxrpc_recvmsg_term(call, msg); | |
624 | if (ret < 0) | |
540b1c48 | 625 | goto error_unlock_call; |
248f219c DH |
626 | if (!(flags & MSG_PEEK)) |
627 | rxrpc_release_call(rx, call); | |
628 | msg->msg_flags |= MSG_EOR; | |
629 | ret = 1; | |
17926a79 DH |
630 | } |
631 | ||
248f219c DH |
632 | if (ret == 0) |
633 | msg->msg_flags |= MSG_MORE; | |
634 | else | |
635 | msg->msg_flags &= ~MSG_MORE; | |
636 | ret = copied; | |
17926a79 | 637 | |
540b1c48 DH |
638 | error_unlock_call: |
639 | mutex_unlock(&call->user_mutex); | |
fff72429 | 640 | rxrpc_put_call(call, rxrpc_call_put); |
540b1c48 DH |
641 | trace_rxrpc_recvmsg(call, rxrpc_recvmsg_return, 0, 0, 0, ret); |
642 | return ret; | |
643 | ||
644 | error_requeue_call: | |
645 | if (!(flags & MSG_PEEK)) { | |
646 | write_lock_bh(&rx->recvmsg_lock); | |
647 | list_add(&call->recvmsg_link, &rx->recvmsg_q); | |
648 | write_unlock_bh(&rx->recvmsg_lock); | |
649 | trace_rxrpc_recvmsg(call, rxrpc_recvmsg_requeue, 0, 0, 0, 0); | |
650 | } else { | |
651 | rxrpc_put_call(call, rxrpc_call_put); | |
652 | } | |
248f219c DH |
653 | error_no_call: |
654 | release_sock(&rx->sk); | |
6dce3c20 | 655 | error_trace: |
84997905 | 656 | trace_rxrpc_recvmsg(call, rxrpc_recvmsg_return, 0, 0, 0, ret); |
17926a79 DH |
657 | return ret; |
658 | ||
17926a79 DH |
659 | wait_interrupted: |
660 | ret = sock_intr_errno(timeo); | |
661 | wait_error: | |
4a4771a5 | 662 | finish_wait(sk_sleep(&rx->sk), &wait); |
84997905 | 663 | call = NULL; |
6dce3c20 | 664 | goto error_trace; |
d001648e | 665 | } |
651350d1 DH |
666 | |
667 | /** | |
d001648e DH |
668 | * rxrpc_kernel_recv_data - Allow a kernel service to receive data/info |
669 | * @sock: The socket that the call exists on | |
670 | * @call: The call to send data through | |
eb9950eb | 671 | * @iter: The buffer to receive into |
d001648e DH |
672 | * @want_more: True if more data is expected to be read |
673 | * @_abort: Where the abort code is stored if -ECONNABORTED is returned | |
a68f4a27 | 674 | * @_service: Where to store the actual service ID (may be upgraded) |
d001648e DH |
675 | * |
676 | * Allow a kernel service to receive data and pick up information about the | |
677 | * state of a call. Returns 0 if got what was asked for and there's more | |
678 | * available, 1 if we got what was asked for and we're at the end of the data | |
679 | * and -EAGAIN if we need more data. | |
680 | * | |
681 | * Note that we may return -EAGAIN to drain empty packets at the end of the | |
682 | * data, even if we've already copied over the requested data. | |
651350d1 | 683 | * |
d001648e | 684 | * *_abort should also be initialised to 0. |
651350d1 | 685 | */ |
d001648e | 686 | int rxrpc_kernel_recv_data(struct socket *sock, struct rxrpc_call *call, |
eb9950eb | 687 | struct iov_iter *iter, |
a68f4a27 | 688 | bool want_more, u32 *_abort, u16 *_service) |
651350d1 | 689 | { |
eb9950eb | 690 | size_t offset = 0; |
d001648e | 691 | int ret; |
651350d1 | 692 | |
eb9950eb | 693 | _enter("{%d,%s},%zu,%d", |
248f219c | 694 | call->debug_id, rxrpc_call_states[call->state], |
eb9950eb | 695 | iov_iter_count(iter), want_more); |
d001648e | 696 | |
2d914c1b | 697 | ASSERTCMP(call->state, !=, RXRPC_CALL_SERVER_SECURING); |
651350d1 | 698 | |
540b1c48 | 699 | mutex_lock(&call->user_mutex); |
d001648e | 700 | |
146d8fef | 701 | switch (READ_ONCE(call->state)) { |
d001648e DH |
702 | case RXRPC_CALL_CLIENT_RECV_REPLY: |
703 | case RXRPC_CALL_SERVER_RECV_REQUEST: | |
704 | case RXRPC_CALL_SERVER_ACK_REQUEST: | |
eb9950eb DH |
705 | ret = rxrpc_recvmsg_data(sock, call, NULL, iter, |
706 | iov_iter_count(iter), 0, | |
707 | &offset); | |
d001648e DH |
708 | if (ret < 0) |
709 | goto out; | |
710 | ||
711 | /* We can only reach here with a partially full buffer if we | |
712 | * have reached the end of the data. We must otherwise have a | |
713 | * full buffer or have been given -EAGAIN. | |
714 | */ | |
715 | if (ret == 1) { | |
eb9950eb | 716 | if (iov_iter_count(iter) > 0) |
d001648e DH |
717 | goto short_data; |
718 | if (!want_more) | |
719 | goto read_phase_complete; | |
720 | ret = 0; | |
721 | goto out; | |
722 | } | |
723 | ||
724 | if (!want_more) | |
725 | goto excess_data; | |
726 | goto out; | |
727 | ||
728 | case RXRPC_CALL_COMPLETE: | |
729 | goto call_complete; | |
730 | ||
731 | default: | |
d001648e DH |
732 | ret = -EINPROGRESS; |
733 | goto out; | |
734 | } | |
735 | ||
736 | read_phase_complete: | |
737 | ret = 1; | |
738 | out: | |
d0b35a42 DH |
739 | switch (call->ackr_reason) { |
740 | case RXRPC_ACK_IDLE: | |
741 | break; | |
742 | case RXRPC_ACK_DELAY: | |
743 | if (ret != -EAGAIN) | |
744 | break; | |
df561f66 | 745 | fallthrough; |
d0b35a42 DH |
746 | default: |
747 | rxrpc_send_ack_packet(call, false, NULL); | |
748 | } | |
749 | ||
a68f4a27 DH |
750 | if (_service) |
751 | *_service = call->service_id; | |
540b1c48 | 752 | mutex_unlock(&call->user_mutex); |
eb9950eb | 753 | _leave(" = %d [%zu,%d]", ret, iov_iter_count(iter), *_abort); |
d001648e DH |
754 | return ret; |
755 | ||
756 | short_data: | |
fb46f6ee | 757 | trace_rxrpc_rx_eproto(call, 0, tracepoint_string("short_data")); |
d001648e DH |
758 | ret = -EBADMSG; |
759 | goto out; | |
760 | excess_data: | |
fb46f6ee | 761 | trace_rxrpc_rx_eproto(call, 0, tracepoint_string("excess_data")); |
d001648e DH |
762 | ret = -EMSGSIZE; |
763 | goto out; | |
764 | call_complete: | |
765 | *_abort = call->abort_code; | |
3a92789a | 766 | ret = call->error; |
d001648e DH |
767 | if (call->completion == RXRPC_CALL_SUCCEEDED) { |
768 | ret = 1; | |
eb9950eb | 769 | if (iov_iter_count(iter) > 0) |
d001648e DH |
770 | ret = -ECONNRESET; |
771 | } | |
772 | goto out; | |
773 | } | |
774 | EXPORT_SYMBOL(rxrpc_kernel_recv_data); | |
2070a3e4 DH |
775 | |
776 | /** | |
777 | * rxrpc_kernel_get_reply_time - Get timestamp on first reply packet | |
778 | * @sock: The socket that the call exists on | |
779 | * @call: The call to query | |
780 | * @_ts: Where to put the timestamp | |
781 | * | |
782 | * Retrieve the timestamp from the first DATA packet of the reply if it is | |
783 | * in the ring. Returns true if successful, false if not. | |
784 | */ | |
785 | bool rxrpc_kernel_get_reply_time(struct socket *sock, struct rxrpc_call *call, | |
786 | ktime_t *_ts) | |
787 | { | |
788 | struct sk_buff *skb; | |
789 | rxrpc_seq_t hard_ack, top, seq; | |
790 | bool success = false; | |
791 | ||
792 | mutex_lock(&call->user_mutex); | |
793 | ||
794 | if (READ_ONCE(call->state) != RXRPC_CALL_CLIENT_RECV_REPLY) | |
795 | goto out; | |
796 | ||
797 | hard_ack = call->rx_hard_ack; | |
798 | if (hard_ack != 0) | |
799 | goto out; | |
800 | ||
801 | seq = hard_ack + 1; | |
802 | top = smp_load_acquire(&call->rx_top); | |
803 | if (after(seq, top)) | |
804 | goto out; | |
805 | ||
806 | skb = call->rxtx_buffer[seq & RXRPC_RXTX_BUFF_MASK]; | |
807 | if (!skb) | |
808 | goto out; | |
809 | ||
810 | *_ts = skb_get_ktime(skb); | |
811 | success = true; | |
812 | ||
813 | out: | |
814 | mutex_unlock(&call->user_mutex); | |
815 | return success; | |
816 | } | |
817 | EXPORT_SYMBOL(rxrpc_kernel_get_reply_time); |