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Commit | Line | Data |
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0b58b8a1 DH |
1 | /* AF_RXRPC sendmsg() implementation. |
2 | * | |
3 | * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public Licence | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the Licence, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
13 | ||
14 | #include <linux/net.h> | |
15 | #include <linux/gfp.h> | |
16 | #include <linux/skbuff.h> | |
17 | #include <linux/export.h> | |
174cd4b1 IM |
18 | #include <linux/sched/signal.h> |
19 | ||
0b58b8a1 DH |
20 | #include <net/sock.h> |
21 | #include <net/af_rxrpc.h> | |
22 | #include "ar-internal.h" | |
23 | ||
3dc20f09 DH |
24 | enum rxrpc_command { |
25 | RXRPC_CMD_SEND_DATA, /* send data message */ | |
26 | RXRPC_CMD_SEND_ABORT, /* request abort generation */ | |
27 | RXRPC_CMD_ACCEPT, /* [server] accept incoming call */ | |
28 | RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */ | |
29 | }; | |
30 | ||
3ab26a6f | 31 | struct rxrpc_send_params { |
e754eba6 | 32 | s64 tx_total_len; /* Total Tx data length (if send data) */ |
3ab26a6f DH |
33 | unsigned long user_call_ID; /* User's call ID */ |
34 | u32 abort_code; /* Abort code to Tx (if abort) */ | |
35 | enum rxrpc_command command : 8; /* The command to implement */ | |
36 | bool exclusive; /* Shared or exclusive call */ | |
37 | bool upgrade; /* If the connection is upgradeable */ | |
38 | }; | |
39 | ||
0b58b8a1 | 40 | /* |
df423a4a DH |
41 | * wait for space to appear in the transmit/ACK window |
42 | * - caller holds the socket locked | |
0b58b8a1 | 43 | */ |
df423a4a DH |
44 | static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx, |
45 | struct rxrpc_call *call, | |
46 | long *timeo) | |
0b58b8a1 | 47 | { |
df423a4a DH |
48 | DECLARE_WAITQUEUE(myself, current); |
49 | int ret; | |
0b58b8a1 | 50 | |
248f219c DH |
51 | _enter(",{%u,%u,%u}", |
52 | call->tx_hard_ack, call->tx_top, call->tx_winsize); | |
0b58b8a1 | 53 | |
df423a4a | 54 | add_wait_queue(&call->waitq, &myself); |
0b58b8a1 | 55 | |
df423a4a DH |
56 | for (;;) { |
57 | set_current_state(TASK_INTERRUPTIBLE); | |
58 | ret = 0; | |
57494343 DH |
59 | if (call->tx_top - call->tx_hard_ack < |
60 | min_t(unsigned int, call->tx_winsize, | |
61 | call->cong_cwnd + call->cong_extra)) | |
0b58b8a1 | 62 | break; |
248f219c DH |
63 | if (call->state >= RXRPC_CALL_COMPLETE) { |
64 | ret = -call->error; | |
65 | break; | |
66 | } | |
df423a4a DH |
67 | if (signal_pending(current)) { |
68 | ret = sock_intr_errno(*timeo); | |
0b58b8a1 | 69 | break; |
0b58b8a1 | 70 | } |
df423a4a | 71 | |
a124fe3e | 72 | trace_rxrpc_transmit(call, rxrpc_transmit_wait); |
540b1c48 | 73 | mutex_unlock(&call->user_mutex); |
df423a4a | 74 | *timeo = schedule_timeout(*timeo); |
540b1c48 DH |
75 | if (mutex_lock_interruptible(&call->user_mutex) < 0) { |
76 | ret = sock_intr_errno(*timeo); | |
77 | break; | |
78 | } | |
0b58b8a1 DH |
79 | } |
80 | ||
df423a4a DH |
81 | remove_wait_queue(&call->waitq, &myself); |
82 | set_current_state(TASK_RUNNING); | |
83 | _leave(" = %d", ret); | |
84 | return ret; | |
0b58b8a1 DH |
85 | } |
86 | ||
87 | /* | |
248f219c | 88 | * Schedule an instant Tx resend. |
0b58b8a1 | 89 | */ |
248f219c | 90 | static inline void rxrpc_instant_resend(struct rxrpc_call *call, int ix) |
0b58b8a1 | 91 | { |
248f219c DH |
92 | spin_lock_bh(&call->lock); |
93 | ||
94 | if (call->state < RXRPC_CALL_COMPLETE) { | |
95 | call->rxtx_annotations[ix] = RXRPC_TX_ANNO_RETRANS; | |
96 | if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) | |
df423a4a | 97 | rxrpc_queue_call(call); |
0b58b8a1 | 98 | } |
248f219c DH |
99 | |
100 | spin_unlock_bh(&call->lock); | |
0b58b8a1 DH |
101 | } |
102 | ||
103 | /* | |
248f219c DH |
104 | * Queue a DATA packet for transmission, set the resend timeout and send the |
105 | * packet immediately | |
0b58b8a1 | 106 | */ |
df423a4a DH |
107 | static void rxrpc_queue_packet(struct rxrpc_call *call, struct sk_buff *skb, |
108 | bool last) | |
0b58b8a1 | 109 | { |
df423a4a | 110 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
248f219c DH |
111 | rxrpc_seq_t seq = sp->hdr.seq; |
112 | int ret, ix; | |
70790dbe | 113 | u8 annotation = RXRPC_TX_ANNO_UNACK; |
248f219c DH |
114 | |
115 | _net("queue skb %p [%d]", skb, seq); | |
0b58b8a1 | 116 | |
248f219c | 117 | ASSERTCMP(seq, ==, call->tx_top + 1); |
0b58b8a1 | 118 | |
70790dbe DH |
119 | if (last) |
120 | annotation |= RXRPC_TX_ANNO_LAST; | |
121 | ||
b24d2891 DH |
122 | /* We have to set the timestamp before queueing as the retransmit |
123 | * algorithm can see the packet as soon as we queue it. | |
124 | */ | |
125 | skb->tstamp = ktime_get_real(); | |
126 | ||
248f219c | 127 | ix = seq & RXRPC_RXTX_BUFF_MASK; |
71f3ca40 | 128 | rxrpc_get_skb(skb, rxrpc_skb_tx_got); |
70790dbe | 129 | call->rxtx_annotations[ix] = annotation; |
df423a4a | 130 | smp_wmb(); |
248f219c DH |
131 | call->rxtx_buffer[ix] = skb; |
132 | call->tx_top = seq; | |
70790dbe | 133 | if (last) |
a124fe3e | 134 | trace_rxrpc_transmit(call, rxrpc_transmit_queue_last); |
70790dbe | 135 | else |
a124fe3e | 136 | trace_rxrpc_transmit(call, rxrpc_transmit_queue); |
0b58b8a1 | 137 | |
df423a4a DH |
138 | if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) { |
139 | _debug("________awaiting reply/ACK__________"); | |
140 | write_lock_bh(&call->state_lock); | |
141 | switch (call->state) { | |
142 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
143 | call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY; | |
144 | break; | |
145 | case RXRPC_CALL_SERVER_ACK_REQUEST: | |
146 | call->state = RXRPC_CALL_SERVER_SEND_REPLY; | |
9749fd2b DH |
147 | call->ack_at = call->expire_at; |
148 | if (call->ackr_reason == RXRPC_ACK_DELAY) | |
149 | call->ackr_reason = 0; | |
150 | __rxrpc_set_timer(call, rxrpc_timer_init_for_send_reply, | |
151 | ktime_get_real()); | |
df423a4a DH |
152 | if (!last) |
153 | break; | |
154 | case RXRPC_CALL_SERVER_SEND_REPLY: | |
155 | call->state = RXRPC_CALL_SERVER_AWAIT_ACK; | |
156 | break; | |
157 | default: | |
158 | break; | |
159 | } | |
160 | write_unlock_bh(&call->state_lock); | |
161 | } | |
0b58b8a1 | 162 | |
248f219c DH |
163 | if (seq == 1 && rxrpc_is_client_call(call)) |
164 | rxrpc_expose_client_call(call); | |
df423a4a | 165 | |
a1767077 | 166 | ret = rxrpc_send_data_packet(call, skb, false); |
df423a4a DH |
167 | if (ret < 0) { |
168 | _debug("need instant resend %d", ret); | |
248f219c | 169 | rxrpc_instant_resend(call, ix); |
dfc3da44 | 170 | } else { |
df0adc78 | 171 | ktime_t now = ktime_get_real(), resend_at; |
dfc3da44 | 172 | |
df0adc78 | 173 | resend_at = ktime_add_ms(now, rxrpc_resend_timeout); |
dfc3da44 | 174 | |
df0adc78 | 175 | if (ktime_before(resend_at, call->resend_at)) { |
dfc3da44 | 176 | call->resend_at = resend_at; |
df0adc78 | 177 | rxrpc_set_timer(call, rxrpc_timer_set_for_send, now); |
dfc3da44 | 178 | } |
df423a4a DH |
179 | } |
180 | ||
71f3ca40 | 181 | rxrpc_free_skb(skb, rxrpc_skb_tx_freed); |
df423a4a | 182 | _leave(""); |
0b58b8a1 DH |
183 | } |
184 | ||
df423a4a DH |
185 | /* |
186 | * send data through a socket | |
187 | * - must be called in process context | |
540b1c48 | 188 | * - The caller holds the call user access mutex, but not the socket lock. |
0b58b8a1 | 189 | */ |
df423a4a DH |
190 | static int rxrpc_send_data(struct rxrpc_sock *rx, |
191 | struct rxrpc_call *call, | |
192 | struct msghdr *msg, size_t len) | |
0b58b8a1 | 193 | { |
df423a4a DH |
194 | struct rxrpc_skb_priv *sp; |
195 | struct sk_buff *skb; | |
196 | struct sock *sk = &rx->sk; | |
197 | long timeo; | |
198 | bool more; | |
199 | int ret, copied; | |
0b58b8a1 | 200 | |
df423a4a | 201 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
0b58b8a1 | 202 | |
df423a4a DH |
203 | /* this should be in poll */ |
204 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); | |
0b58b8a1 | 205 | |
df423a4a DH |
206 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) |
207 | return -EPIPE; | |
0b58b8a1 | 208 | |
df423a4a | 209 | more = msg->msg_flags & MSG_MORE; |
0b58b8a1 | 210 | |
e754eba6 DH |
211 | if (call->tx_total_len != -1) { |
212 | if (len > call->tx_total_len) | |
213 | return -EMSGSIZE; | |
214 | if (!more && len != call->tx_total_len) | |
215 | return -EMSGSIZE; | |
216 | } | |
217 | ||
df423a4a DH |
218 | skb = call->tx_pending; |
219 | call->tx_pending = NULL; | |
71f3ca40 | 220 | rxrpc_see_skb(skb, rxrpc_skb_tx_seen); |
0b58b8a1 | 221 | |
df423a4a DH |
222 | copied = 0; |
223 | do { | |
7aa51da7 DH |
224 | /* Check to see if there's a ping ACK to reply to. */ |
225 | if (call->ackr_reason == RXRPC_ACK_PING_RESPONSE) | |
a5af7e1f | 226 | rxrpc_send_ack_packet(call, false); |
7aa51da7 | 227 | |
df423a4a DH |
228 | if (!skb) { |
229 | size_t size, chunk, max, space; | |
0b58b8a1 | 230 | |
df423a4a | 231 | _debug("alloc"); |
0b58b8a1 | 232 | |
248f219c | 233 | if (call->tx_top - call->tx_hard_ack >= |
57494343 DH |
234 | min_t(unsigned int, call->tx_winsize, |
235 | call->cong_cwnd + call->cong_extra)) { | |
df423a4a DH |
236 | ret = -EAGAIN; |
237 | if (msg->msg_flags & MSG_DONTWAIT) | |
238 | goto maybe_error; | |
239 | ret = rxrpc_wait_for_tx_window(rx, call, | |
240 | &timeo); | |
241 | if (ret < 0) | |
242 | goto maybe_error; | |
243 | } | |
0b58b8a1 | 244 | |
182f5056 | 245 | max = RXRPC_JUMBO_DATALEN; |
df423a4a DH |
246 | max -= call->conn->security_size; |
247 | max &= ~(call->conn->size_align - 1UL); | |
0b58b8a1 | 248 | |
df423a4a DH |
249 | chunk = max; |
250 | if (chunk > msg_data_left(msg) && !more) | |
251 | chunk = msg_data_left(msg); | |
0b58b8a1 | 252 | |
df423a4a DH |
253 | space = chunk + call->conn->size_align; |
254 | space &= ~(call->conn->size_align - 1UL); | |
0b58b8a1 | 255 | |
5a924b89 | 256 | size = space + call->conn->security_size; |
0b58b8a1 | 257 | |
df423a4a | 258 | _debug("SIZE: %zu/%zu/%zu", chunk, space, size); |
0b58b8a1 | 259 | |
df423a4a DH |
260 | /* create a buffer that we can retain until it's ACK'd */ |
261 | skb = sock_alloc_send_skb( | |
262 | sk, size, msg->msg_flags & MSG_DONTWAIT, &ret); | |
263 | if (!skb) | |
264 | goto maybe_error; | |
0b58b8a1 | 265 | |
71f3ca40 | 266 | rxrpc_new_skb(skb, rxrpc_skb_tx_new); |
0b58b8a1 | 267 | |
df423a4a | 268 | _debug("ALLOC SEND %p", skb); |
0b58b8a1 | 269 | |
df423a4a | 270 | ASSERTCMP(skb->mark, ==, 0); |
0b58b8a1 | 271 | |
5a924b89 DH |
272 | _debug("HS: %u", call->conn->security_size); |
273 | skb_reserve(skb, call->conn->security_size); | |
274 | skb->len += call->conn->security_size; | |
0b58b8a1 | 275 | |
df423a4a DH |
276 | sp = rxrpc_skb(skb); |
277 | sp->remain = chunk; | |
278 | if (sp->remain > skb_tailroom(skb)) | |
279 | sp->remain = skb_tailroom(skb); | |
0b58b8a1 | 280 | |
df423a4a DH |
281 | _net("skb: hr %d, tr %d, hl %d, rm %d", |
282 | skb_headroom(skb), | |
283 | skb_tailroom(skb), | |
284 | skb_headlen(skb), | |
285 | sp->remain); | |
0b58b8a1 | 286 | |
df423a4a DH |
287 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
288 | } | |
0b58b8a1 | 289 | |
df423a4a DH |
290 | _debug("append"); |
291 | sp = rxrpc_skb(skb); | |
0b58b8a1 | 292 | |
df423a4a DH |
293 | /* append next segment of data to the current buffer */ |
294 | if (msg_data_left(msg) > 0) { | |
295 | int copy = skb_tailroom(skb); | |
296 | ASSERTCMP(copy, >, 0); | |
297 | if (copy > msg_data_left(msg)) | |
298 | copy = msg_data_left(msg); | |
299 | if (copy > sp->remain) | |
300 | copy = sp->remain; | |
0b58b8a1 | 301 | |
df423a4a DH |
302 | _debug("add"); |
303 | ret = skb_add_data(skb, &msg->msg_iter, copy); | |
304 | _debug("added"); | |
305 | if (ret < 0) | |
306 | goto efault; | |
307 | sp->remain -= copy; | |
308 | skb->mark += copy; | |
309 | copied += copy; | |
e754eba6 DH |
310 | if (call->tx_total_len != -1) |
311 | call->tx_total_len -= copy; | |
0b58b8a1 DH |
312 | } |
313 | ||
df423a4a DH |
314 | /* check for the far side aborting the call or a network error |
315 | * occurring */ | |
316 | if (call->state == RXRPC_CALL_COMPLETE) | |
317 | goto call_terminated; | |
0b58b8a1 | 318 | |
df423a4a DH |
319 | /* add the packet to the send queue if it's now full */ |
320 | if (sp->remain <= 0 || | |
321 | (msg_data_left(msg) == 0 && !more)) { | |
322 | struct rxrpc_connection *conn = call->conn; | |
323 | uint32_t seq; | |
324 | size_t pad; | |
0b58b8a1 | 325 | |
df423a4a DH |
326 | /* pad out if we're using security */ |
327 | if (conn->security_ix) { | |
328 | pad = conn->security_size + skb->mark; | |
329 | pad = conn->size_align - pad; | |
330 | pad &= conn->size_align - 1; | |
331 | _debug("pad %zu", pad); | |
332 | if (pad) | |
b080db58 | 333 | skb_put_zero(skb, pad); |
df423a4a | 334 | } |
0b58b8a1 | 335 | |
248f219c | 336 | seq = call->tx_top + 1; |
0b58b8a1 | 337 | |
df423a4a | 338 | sp->hdr.seq = seq; |
df423a4a | 339 | sp->hdr._rsvd = 0; |
5a924b89 | 340 | sp->hdr.flags = conn->out_clientflag; |
0b58b8a1 | 341 | |
df423a4a DH |
342 | if (msg_data_left(msg) == 0 && !more) |
343 | sp->hdr.flags |= RXRPC_LAST_PACKET; | |
248f219c DH |
344 | else if (call->tx_top - call->tx_hard_ack < |
345 | call->tx_winsize) | |
df423a4a | 346 | sp->hdr.flags |= RXRPC_MORE_PACKETS; |
0b58b8a1 | 347 | |
df423a4a | 348 | ret = conn->security->secure_packet( |
5a924b89 | 349 | call, skb, skb->mark, skb->head); |
df423a4a DH |
350 | if (ret < 0) |
351 | goto out; | |
0b58b8a1 | 352 | |
df423a4a DH |
353 | rxrpc_queue_packet(call, skb, !msg_data_left(msg) && !more); |
354 | skb = NULL; | |
355 | } | |
356 | } while (msg_data_left(msg) > 0); | |
0b58b8a1 | 357 | |
df423a4a DH |
358 | success: |
359 | ret = copied; | |
360 | out: | |
361 | call->tx_pending = skb; | |
362 | _leave(" = %d", ret); | |
363 | return ret; | |
0b58b8a1 | 364 | |
df423a4a | 365 | call_terminated: |
71f3ca40 | 366 | rxrpc_free_skb(skb, rxrpc_skb_tx_freed); |
df423a4a | 367 | _leave(" = %d", -call->error); |
248f219c | 368 | return -call->error; |
0b58b8a1 | 369 | |
df423a4a DH |
370 | maybe_error: |
371 | if (copied) | |
372 | goto success; | |
373 | goto out; | |
0b58b8a1 | 374 | |
df423a4a DH |
375 | efault: |
376 | ret = -EFAULT; | |
377 | goto out; | |
0b58b8a1 DH |
378 | } |
379 | ||
380 | /* | |
df423a4a | 381 | * extract control messages from the sendmsg() control buffer |
0b58b8a1 | 382 | */ |
3ab26a6f | 383 | static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p) |
0b58b8a1 | 384 | { |
df423a4a DH |
385 | struct cmsghdr *cmsg; |
386 | bool got_user_ID = false; | |
387 | int len; | |
0b58b8a1 | 388 | |
df423a4a DH |
389 | if (msg->msg_controllen == 0) |
390 | return -EINVAL; | |
0b58b8a1 | 391 | |
df423a4a DH |
392 | for_each_cmsghdr(cmsg, msg) { |
393 | if (!CMSG_OK(msg, cmsg)) | |
394 | return -EINVAL; | |
0b58b8a1 | 395 | |
1ff8cebf | 396 | len = cmsg->cmsg_len - sizeof(struct cmsghdr); |
df423a4a DH |
397 | _debug("CMSG %d, %d, %d", |
398 | cmsg->cmsg_level, cmsg->cmsg_type, len); | |
0b58b8a1 | 399 | |
df423a4a DH |
400 | if (cmsg->cmsg_level != SOL_RXRPC) |
401 | continue; | |
0b58b8a1 | 402 | |
df423a4a DH |
403 | switch (cmsg->cmsg_type) { |
404 | case RXRPC_USER_CALL_ID: | |
405 | if (msg->msg_flags & MSG_CMSG_COMPAT) { | |
406 | if (len != sizeof(u32)) | |
407 | return -EINVAL; | |
3ab26a6f | 408 | p->user_call_ID = *(u32 *)CMSG_DATA(cmsg); |
df423a4a DH |
409 | } else { |
410 | if (len != sizeof(unsigned long)) | |
411 | return -EINVAL; | |
3ab26a6f | 412 | p->user_call_ID = *(unsigned long *) |
df423a4a DH |
413 | CMSG_DATA(cmsg); |
414 | } | |
df423a4a DH |
415 | got_user_ID = true; |
416 | break; | |
0b58b8a1 | 417 | |
df423a4a | 418 | case RXRPC_ABORT: |
3ab26a6f | 419 | if (p->command != RXRPC_CMD_SEND_DATA) |
df423a4a | 420 | return -EINVAL; |
3ab26a6f DH |
421 | p->command = RXRPC_CMD_SEND_ABORT; |
422 | if (len != sizeof(p->abort_code)) | |
df423a4a | 423 | return -EINVAL; |
3ab26a6f DH |
424 | p->abort_code = *(unsigned int *)CMSG_DATA(cmsg); |
425 | if (p->abort_code == 0) | |
df423a4a DH |
426 | return -EINVAL; |
427 | break; | |
0b58b8a1 | 428 | |
df423a4a | 429 | case RXRPC_ACCEPT: |
3ab26a6f | 430 | if (p->command != RXRPC_CMD_SEND_DATA) |
df423a4a | 431 | return -EINVAL; |
3ab26a6f | 432 | p->command = RXRPC_CMD_ACCEPT; |
df423a4a DH |
433 | if (len != 0) |
434 | return -EINVAL; | |
435 | break; | |
0b58b8a1 | 436 | |
df423a4a | 437 | case RXRPC_EXCLUSIVE_CALL: |
3ab26a6f | 438 | p->exclusive = true; |
df423a4a DH |
439 | if (len != 0) |
440 | return -EINVAL; | |
441 | break; | |
4e255721 DH |
442 | |
443 | case RXRPC_UPGRADE_SERVICE: | |
3ab26a6f | 444 | p->upgrade = true; |
4e255721 DH |
445 | if (len != 0) |
446 | return -EINVAL; | |
447 | break; | |
448 | ||
e754eba6 DH |
449 | case RXRPC_TX_LENGTH: |
450 | if (p->tx_total_len != -1 || len != sizeof(__s64)) | |
451 | return -EINVAL; | |
452 | p->tx_total_len = *(__s64 *)CMSG_DATA(cmsg); | |
453 | if (p->tx_total_len < 0) | |
454 | return -EINVAL; | |
455 | break; | |
456 | ||
df423a4a DH |
457 | default: |
458 | return -EINVAL; | |
459 | } | |
460 | } | |
0b58b8a1 | 461 | |
df423a4a DH |
462 | if (!got_user_ID) |
463 | return -EINVAL; | |
e754eba6 DH |
464 | if (p->tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA) |
465 | return -EINVAL; | |
df423a4a DH |
466 | _leave(" = 0"); |
467 | return 0; | |
468 | } | |
0b58b8a1 | 469 | |
df423a4a DH |
470 | /* |
471 | * Create a new client call for sendmsg(). | |
540b1c48 DH |
472 | * - Called with the socket lock held, which it must release. |
473 | * - If it returns a call, the call's lock will need releasing by the caller. | |
df423a4a DH |
474 | */ |
475 | static struct rxrpc_call * | |
476 | rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, | |
3ab26a6f | 477 | struct rxrpc_send_params *p) |
540b1c48 | 478 | __releases(&rx->sk.sk_lock.slock) |
df423a4a DH |
479 | { |
480 | struct rxrpc_conn_parameters cp; | |
481 | struct rxrpc_call *call; | |
482 | struct key *key; | |
0b58b8a1 | 483 | |
df423a4a | 484 | DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name); |
0b58b8a1 | 485 | |
df423a4a | 486 | _enter(""); |
0b58b8a1 | 487 | |
540b1c48 DH |
488 | if (!msg->msg_name) { |
489 | release_sock(&rx->sk); | |
df423a4a | 490 | return ERR_PTR(-EDESTADDRREQ); |
540b1c48 | 491 | } |
0b58b8a1 | 492 | |
df423a4a DH |
493 | key = rx->key; |
494 | if (key && !rx->key->payload.data[0]) | |
495 | key = NULL; | |
0b58b8a1 | 496 | |
df423a4a DH |
497 | memset(&cp, 0, sizeof(cp)); |
498 | cp.local = rx->local; | |
499 | cp.key = rx->key; | |
500 | cp.security_level = rx->min_sec_level; | |
3ab26a6f DH |
501 | cp.exclusive = rx->exclusive | p->exclusive; |
502 | cp.upgrade = p->upgrade; | |
df423a4a | 503 | cp.service_id = srx->srx_service; |
e754eba6 DH |
504 | call = rxrpc_new_client_call(rx, &cp, srx, p->user_call_ID, |
505 | p->tx_total_len, GFP_KERNEL); | |
540b1c48 | 506 | /* The socket is now unlocked */ |
0b58b8a1 | 507 | |
df423a4a DH |
508 | _leave(" = %p\n", call); |
509 | return call; | |
510 | } | |
0b58b8a1 | 511 | |
df423a4a DH |
512 | /* |
513 | * send a message forming part of a client call through an RxRPC socket | |
514 | * - caller holds the socket locked | |
515 | * - the socket may be either a client socket or a server socket | |
516 | */ | |
517 | int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len) | |
540b1c48 | 518 | __releases(&rx->sk.sk_lock.slock) |
df423a4a | 519 | { |
146d8fef | 520 | enum rxrpc_call_state state; |
df423a4a | 521 | struct rxrpc_call *call; |
df423a4a | 522 | int ret; |
0b58b8a1 | 523 | |
3ab26a6f | 524 | struct rxrpc_send_params p = { |
e754eba6 | 525 | .tx_total_len = -1, |
3ab26a6f DH |
526 | .user_call_ID = 0, |
527 | .abort_code = 0, | |
528 | .command = RXRPC_CMD_SEND_DATA, | |
529 | .exclusive = false, | |
530 | .upgrade = true, | |
531 | }; | |
532 | ||
df423a4a | 533 | _enter(""); |
0b58b8a1 | 534 | |
3ab26a6f | 535 | ret = rxrpc_sendmsg_cmsg(msg, &p); |
df423a4a | 536 | if (ret < 0) |
540b1c48 | 537 | goto error_release_sock; |
0b58b8a1 | 538 | |
3ab26a6f | 539 | if (p.command == RXRPC_CMD_ACCEPT) { |
540b1c48 | 540 | ret = -EINVAL; |
df423a4a | 541 | if (rx->sk.sk_state != RXRPC_SERVER_LISTENING) |
540b1c48 | 542 | goto error_release_sock; |
3ab26a6f | 543 | call = rxrpc_accept_call(rx, p.user_call_ID, NULL); |
540b1c48 | 544 | /* The socket is now unlocked. */ |
df423a4a DH |
545 | if (IS_ERR(call)) |
546 | return PTR_ERR(call); | |
fff72429 | 547 | rxrpc_put_call(call, rxrpc_call_put); |
df423a4a DH |
548 | return 0; |
549 | } | |
0b58b8a1 | 550 | |
3ab26a6f | 551 | call = rxrpc_find_call_by_user_ID(rx, p.user_call_ID); |
df423a4a | 552 | if (!call) { |
540b1c48 | 553 | ret = -EBADSLT; |
3ab26a6f | 554 | if (p.command != RXRPC_CMD_SEND_DATA) |
540b1c48 | 555 | goto error_release_sock; |
3ab26a6f | 556 | call = rxrpc_new_client_call_for_sendmsg(rx, msg, &p); |
540b1c48 | 557 | /* The socket is now unlocked... */ |
df423a4a DH |
558 | if (IS_ERR(call)) |
559 | return PTR_ERR(call); | |
540b1c48 DH |
560 | /* ... and we have the call lock. */ |
561 | } else { | |
146d8fef DH |
562 | switch (READ_ONCE(call->state)) { |
563 | case RXRPC_CALL_UNINITIALISED: | |
564 | case RXRPC_CALL_CLIENT_AWAIT_CONN: | |
565 | case RXRPC_CALL_SERVER_PREALLOC: | |
566 | case RXRPC_CALL_SERVER_SECURING: | |
567 | case RXRPC_CALL_SERVER_ACCEPTING: | |
568 | ret = -EBUSY; | |
37411cad | 569 | goto error_release_sock; |
146d8fef DH |
570 | default: |
571 | break; | |
572 | } | |
37411cad | 573 | |
540b1c48 DH |
574 | ret = mutex_lock_interruptible(&call->user_mutex); |
575 | release_sock(&rx->sk); | |
576 | if (ret < 0) { | |
577 | ret = -ERESTARTSYS; | |
578 | goto error_put; | |
579 | } | |
e754eba6 DH |
580 | |
581 | if (p.tx_total_len != -1) { | |
582 | ret = -EINVAL; | |
583 | if (call->tx_total_len != -1 || | |
584 | call->tx_pending || | |
585 | call->tx_top != 0) | |
586 | goto error_put; | |
587 | call->tx_total_len = p.tx_total_len; | |
588 | } | |
df423a4a | 589 | } |
0b58b8a1 | 590 | |
146d8fef | 591 | state = READ_ONCE(call->state); |
df423a4a | 592 | _debug("CALL %d USR %lx ST %d on CONN %p", |
146d8fef | 593 | call->debug_id, call->user_call_ID, state, call->conn); |
0b58b8a1 | 594 | |
146d8fef | 595 | if (state >= RXRPC_CALL_COMPLETE) { |
df423a4a DH |
596 | /* it's too late for this call */ |
597 | ret = -ESHUTDOWN; | |
3ab26a6f | 598 | } else if (p.command == RXRPC_CMD_SEND_ABORT) { |
df423a4a | 599 | ret = 0; |
3ab26a6f | 600 | if (rxrpc_abort_call("CMD", call, 0, p.abort_code, -ECONNABORTED)) |
26cb02aa | 601 | ret = rxrpc_send_abort_packet(call); |
3ab26a6f | 602 | } else if (p.command != RXRPC_CMD_SEND_DATA) { |
df423a4a DH |
603 | ret = -EINVAL; |
604 | } else if (rxrpc_is_client_call(call) && | |
146d8fef | 605 | state != RXRPC_CALL_CLIENT_SEND_REQUEST) { |
df423a4a DH |
606 | /* request phase complete for this client call */ |
607 | ret = -EPROTO; | |
608 | } else if (rxrpc_is_service_call(call) && | |
146d8fef DH |
609 | state != RXRPC_CALL_SERVER_ACK_REQUEST && |
610 | state != RXRPC_CALL_SERVER_SEND_REPLY) { | |
df423a4a DH |
611 | /* Reply phase not begun or not complete for service call. */ |
612 | ret = -EPROTO; | |
613 | } else { | |
614 | ret = rxrpc_send_data(rx, call, msg, len); | |
615 | } | |
0b58b8a1 | 616 | |
540b1c48 DH |
617 | mutex_unlock(&call->user_mutex); |
618 | error_put: | |
fff72429 | 619 | rxrpc_put_call(call, rxrpc_call_put); |
df423a4a DH |
620 | _leave(" = %d", ret); |
621 | return ret; | |
540b1c48 DH |
622 | |
623 | error_release_sock: | |
624 | release_sock(&rx->sk); | |
625 | return ret; | |
df423a4a | 626 | } |
0b58b8a1 | 627 | |
df423a4a DH |
628 | /** |
629 | * rxrpc_kernel_send_data - Allow a kernel service to send data on a call | |
630 | * @sock: The socket the call is on | |
631 | * @call: The call to send data through | |
632 | * @msg: The data to send | |
633 | * @len: The amount of data to send | |
634 | * | |
635 | * Allow a kernel service to send data on a call. The call must be in an state | |
636 | * appropriate to sending data. No control data should be supplied in @msg, | |
637 | * nor should an address be supplied. MSG_MORE should be flagged if there's | |
638 | * more data to come, otherwise this data will end the transmission phase. | |
639 | */ | |
640 | int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call, | |
641 | struct msghdr *msg, size_t len) | |
642 | { | |
643 | int ret; | |
0b58b8a1 | 644 | |
df423a4a | 645 | _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]); |
0b58b8a1 | 646 | |
df423a4a DH |
647 | ASSERTCMP(msg->msg_name, ==, NULL); |
648 | ASSERTCMP(msg->msg_control, ==, NULL); | |
0b58b8a1 | 649 | |
540b1c48 | 650 | mutex_lock(&call->user_mutex); |
0b58b8a1 | 651 | |
df423a4a DH |
652 | _debug("CALL %d USR %lx ST %d on CONN %p", |
653 | call->debug_id, call->user_call_ID, call->state, call->conn); | |
0b58b8a1 | 654 | |
146d8fef DH |
655 | switch (READ_ONCE(call->state)) { |
656 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
657 | case RXRPC_CALL_SERVER_ACK_REQUEST: | |
658 | case RXRPC_CALL_SERVER_SEND_REPLY: | |
df423a4a | 659 | ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len); |
146d8fef DH |
660 | break; |
661 | case RXRPC_CALL_COMPLETE: | |
6fc166d6 DH |
662 | read_lock_bh(&call->state_lock); |
663 | ret = -call->error; | |
664 | read_unlock_bh(&call->state_lock); | |
146d8fef DH |
665 | break; |
666 | default: | |
fb46f6ee DH |
667 | /* Request phase complete for this client call */ |
668 | trace_rxrpc_rx_eproto(call, 0, tracepoint_string("late_send")); | |
146d8fef DH |
669 | ret = -EPROTO; |
670 | break; | |
df423a4a DH |
671 | } |
672 | ||
540b1c48 | 673 | mutex_unlock(&call->user_mutex); |
0b58b8a1 DH |
674 | _leave(" = %d", ret); |
675 | return ret; | |
df423a4a DH |
676 | } |
677 | EXPORT_SYMBOL(rxrpc_kernel_send_data); | |
0b58b8a1 | 678 | |
df423a4a DH |
679 | /** |
680 | * rxrpc_kernel_abort_call - Allow a kernel service to abort a call | |
681 | * @sock: The socket the call is on | |
682 | * @call: The call to be aborted | |
683 | * @abort_code: The abort code to stick into the ABORT packet | |
5a42976d DH |
684 | * @error: Local error value |
685 | * @why: 3-char string indicating why. | |
df423a4a | 686 | * |
84a4c09c DH |
687 | * Allow a kernel service to abort a call, if it's still in an abortable state |
688 | * and return true if the call was aborted, false if it was already complete. | |
df423a4a | 689 | */ |
84a4c09c | 690 | bool rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call, |
5a42976d | 691 | u32 abort_code, int error, const char *why) |
df423a4a | 692 | { |
84a4c09c DH |
693 | bool aborted; |
694 | ||
5a42976d | 695 | _enter("{%d},%d,%d,%s", call->debug_id, abort_code, error, why); |
0b58b8a1 | 696 | |
540b1c48 | 697 | mutex_lock(&call->user_mutex); |
0b58b8a1 | 698 | |
84a4c09c DH |
699 | aborted = rxrpc_abort_call(why, call, 0, abort_code, error); |
700 | if (aborted) | |
26cb02aa | 701 | rxrpc_send_abort_packet(call); |
df423a4a | 702 | |
540b1c48 | 703 | mutex_unlock(&call->user_mutex); |
84a4c09c | 704 | return aborted; |
0b58b8a1 | 705 | } |
df423a4a | 706 | EXPORT_SYMBOL(rxrpc_kernel_abort_call); |
e754eba6 DH |
707 | |
708 | /** | |
709 | * rxrpc_kernel_set_tx_length - Set the total Tx length on a call | |
710 | * @sock: The socket the call is on | |
711 | * @call: The call to be informed | |
712 | * @tx_total_len: The amount of data to be transmitted for this call | |
713 | * | |
714 | * Allow a kernel service to set the total transmit length on a call. This | |
715 | * allows buffer-to-packet encrypt-and-copy to be performed. | |
716 | * | |
717 | * This function is primarily for use for setting the reply length since the | |
718 | * request length can be set when beginning the call. | |
719 | */ | |
720 | void rxrpc_kernel_set_tx_length(struct socket *sock, struct rxrpc_call *call, | |
721 | s64 tx_total_len) | |
722 | { | |
723 | WARN_ON(call->tx_total_len != -1); | |
724 | call->tx_total_len = tx_total_len; | |
725 | } | |
726 | EXPORT_SYMBOL(rxrpc_kernel_set_tx_length); |