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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 | ||
0b58b8a1 | 31 | /* |
df423a4a DH |
32 | * wait for space to appear in the transmit/ACK window |
33 | * - caller holds the socket locked | |
0b58b8a1 | 34 | */ |
df423a4a DH |
35 | static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx, |
36 | struct rxrpc_call *call, | |
37 | long *timeo) | |
0b58b8a1 | 38 | { |
df423a4a DH |
39 | DECLARE_WAITQUEUE(myself, current); |
40 | int ret; | |
0b58b8a1 | 41 | |
248f219c DH |
42 | _enter(",{%u,%u,%u}", |
43 | call->tx_hard_ack, call->tx_top, call->tx_winsize); | |
0b58b8a1 | 44 | |
df423a4a | 45 | add_wait_queue(&call->waitq, &myself); |
0b58b8a1 | 46 | |
df423a4a DH |
47 | for (;;) { |
48 | set_current_state(TASK_INTERRUPTIBLE); | |
49 | ret = 0; | |
57494343 DH |
50 | if (call->tx_top - call->tx_hard_ack < |
51 | min_t(unsigned int, call->tx_winsize, | |
52 | call->cong_cwnd + call->cong_extra)) | |
0b58b8a1 | 53 | break; |
248f219c DH |
54 | if (call->state >= RXRPC_CALL_COMPLETE) { |
55 | ret = -call->error; | |
56 | break; | |
57 | } | |
df423a4a DH |
58 | if (signal_pending(current)) { |
59 | ret = sock_intr_errno(*timeo); | |
0b58b8a1 | 60 | break; |
0b58b8a1 | 61 | } |
df423a4a | 62 | |
a124fe3e | 63 | trace_rxrpc_transmit(call, rxrpc_transmit_wait); |
df423a4a DH |
64 | release_sock(&rx->sk); |
65 | *timeo = schedule_timeout(*timeo); | |
66 | lock_sock(&rx->sk); | |
0b58b8a1 DH |
67 | } |
68 | ||
df423a4a DH |
69 | remove_wait_queue(&call->waitq, &myself); |
70 | set_current_state(TASK_RUNNING); | |
71 | _leave(" = %d", ret); | |
72 | return ret; | |
0b58b8a1 DH |
73 | } |
74 | ||
75 | /* | |
248f219c | 76 | * Schedule an instant Tx resend. |
0b58b8a1 | 77 | */ |
248f219c | 78 | static inline void rxrpc_instant_resend(struct rxrpc_call *call, int ix) |
0b58b8a1 | 79 | { |
248f219c DH |
80 | spin_lock_bh(&call->lock); |
81 | ||
82 | if (call->state < RXRPC_CALL_COMPLETE) { | |
83 | call->rxtx_annotations[ix] = RXRPC_TX_ANNO_RETRANS; | |
84 | if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) | |
df423a4a | 85 | rxrpc_queue_call(call); |
0b58b8a1 | 86 | } |
248f219c DH |
87 | |
88 | spin_unlock_bh(&call->lock); | |
0b58b8a1 DH |
89 | } |
90 | ||
91 | /* | |
248f219c DH |
92 | * Queue a DATA packet for transmission, set the resend timeout and send the |
93 | * packet immediately | |
0b58b8a1 | 94 | */ |
df423a4a DH |
95 | static void rxrpc_queue_packet(struct rxrpc_call *call, struct sk_buff *skb, |
96 | bool last) | |
0b58b8a1 | 97 | { |
df423a4a | 98 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
248f219c DH |
99 | rxrpc_seq_t seq = sp->hdr.seq; |
100 | int ret, ix; | |
70790dbe | 101 | u8 annotation = RXRPC_TX_ANNO_UNACK; |
248f219c DH |
102 | |
103 | _net("queue skb %p [%d]", skb, seq); | |
0b58b8a1 | 104 | |
248f219c | 105 | ASSERTCMP(seq, ==, call->tx_top + 1); |
0b58b8a1 | 106 | |
70790dbe DH |
107 | if (last) |
108 | annotation |= RXRPC_TX_ANNO_LAST; | |
109 | ||
b24d2891 DH |
110 | /* We have to set the timestamp before queueing as the retransmit |
111 | * algorithm can see the packet as soon as we queue it. | |
112 | */ | |
113 | skb->tstamp = ktime_get_real(); | |
114 | ||
248f219c | 115 | ix = seq & RXRPC_RXTX_BUFF_MASK; |
71f3ca40 | 116 | rxrpc_get_skb(skb, rxrpc_skb_tx_got); |
70790dbe | 117 | call->rxtx_annotations[ix] = annotation; |
df423a4a | 118 | smp_wmb(); |
248f219c DH |
119 | call->rxtx_buffer[ix] = skb; |
120 | call->tx_top = seq; | |
70790dbe | 121 | if (last) |
a124fe3e | 122 | trace_rxrpc_transmit(call, rxrpc_transmit_queue_last); |
70790dbe | 123 | else |
a124fe3e | 124 | trace_rxrpc_transmit(call, rxrpc_transmit_queue); |
0b58b8a1 | 125 | |
df423a4a DH |
126 | if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) { |
127 | _debug("________awaiting reply/ACK__________"); | |
128 | write_lock_bh(&call->state_lock); | |
129 | switch (call->state) { | |
130 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
131 | call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY; | |
132 | break; | |
133 | case RXRPC_CALL_SERVER_ACK_REQUEST: | |
134 | call->state = RXRPC_CALL_SERVER_SEND_REPLY; | |
9749fd2b DH |
135 | call->ack_at = call->expire_at; |
136 | if (call->ackr_reason == RXRPC_ACK_DELAY) | |
137 | call->ackr_reason = 0; | |
138 | __rxrpc_set_timer(call, rxrpc_timer_init_for_send_reply, | |
139 | ktime_get_real()); | |
df423a4a DH |
140 | if (!last) |
141 | break; | |
142 | case RXRPC_CALL_SERVER_SEND_REPLY: | |
143 | call->state = RXRPC_CALL_SERVER_AWAIT_ACK; | |
144 | break; | |
145 | default: | |
146 | break; | |
147 | } | |
148 | write_unlock_bh(&call->state_lock); | |
149 | } | |
0b58b8a1 | 150 | |
248f219c DH |
151 | if (seq == 1 && rxrpc_is_client_call(call)) |
152 | rxrpc_expose_client_call(call); | |
df423a4a | 153 | |
a1767077 | 154 | ret = rxrpc_send_data_packet(call, skb, false); |
df423a4a DH |
155 | if (ret < 0) { |
156 | _debug("need instant resend %d", ret); | |
248f219c | 157 | rxrpc_instant_resend(call, ix); |
dfc3da44 | 158 | } else { |
df0adc78 | 159 | ktime_t now = ktime_get_real(), resend_at; |
dfc3da44 | 160 | |
df0adc78 | 161 | resend_at = ktime_add_ms(now, rxrpc_resend_timeout); |
dfc3da44 | 162 | |
df0adc78 | 163 | if (ktime_before(resend_at, call->resend_at)) { |
dfc3da44 | 164 | call->resend_at = resend_at; |
df0adc78 | 165 | rxrpc_set_timer(call, rxrpc_timer_set_for_send, now); |
dfc3da44 | 166 | } |
df423a4a DH |
167 | } |
168 | ||
71f3ca40 | 169 | rxrpc_free_skb(skb, rxrpc_skb_tx_freed); |
df423a4a | 170 | _leave(""); |
0b58b8a1 DH |
171 | } |
172 | ||
df423a4a DH |
173 | /* |
174 | * send data through a socket | |
175 | * - must be called in process context | |
0b58b8a1 | 176 | * - caller holds the socket locked |
0b58b8a1 | 177 | */ |
df423a4a DH |
178 | static int rxrpc_send_data(struct rxrpc_sock *rx, |
179 | struct rxrpc_call *call, | |
180 | struct msghdr *msg, size_t len) | |
0b58b8a1 | 181 | { |
df423a4a DH |
182 | struct rxrpc_skb_priv *sp; |
183 | struct sk_buff *skb; | |
184 | struct sock *sk = &rx->sk; | |
185 | long timeo; | |
186 | bool more; | |
187 | int ret, copied; | |
0b58b8a1 | 188 | |
df423a4a | 189 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
0b58b8a1 | 190 | |
df423a4a DH |
191 | /* this should be in poll */ |
192 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); | |
0b58b8a1 | 193 | |
df423a4a DH |
194 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) |
195 | return -EPIPE; | |
0b58b8a1 | 196 | |
df423a4a | 197 | more = msg->msg_flags & MSG_MORE; |
0b58b8a1 | 198 | |
df423a4a DH |
199 | skb = call->tx_pending; |
200 | call->tx_pending = NULL; | |
71f3ca40 | 201 | rxrpc_see_skb(skb, rxrpc_skb_tx_seen); |
0b58b8a1 | 202 | |
df423a4a DH |
203 | copied = 0; |
204 | do { | |
7aa51da7 DH |
205 | /* Check to see if there's a ping ACK to reply to. */ |
206 | if (call->ackr_reason == RXRPC_ACK_PING_RESPONSE) | |
a5af7e1f | 207 | rxrpc_send_ack_packet(call, false); |
7aa51da7 | 208 | |
df423a4a DH |
209 | if (!skb) { |
210 | size_t size, chunk, max, space; | |
0b58b8a1 | 211 | |
df423a4a | 212 | _debug("alloc"); |
0b58b8a1 | 213 | |
248f219c | 214 | if (call->tx_top - call->tx_hard_ack >= |
57494343 DH |
215 | min_t(unsigned int, call->tx_winsize, |
216 | call->cong_cwnd + call->cong_extra)) { | |
df423a4a DH |
217 | ret = -EAGAIN; |
218 | if (msg->msg_flags & MSG_DONTWAIT) | |
219 | goto maybe_error; | |
220 | ret = rxrpc_wait_for_tx_window(rx, call, | |
221 | &timeo); | |
222 | if (ret < 0) | |
223 | goto maybe_error; | |
224 | } | |
0b58b8a1 | 225 | |
182f5056 | 226 | max = RXRPC_JUMBO_DATALEN; |
df423a4a DH |
227 | max -= call->conn->security_size; |
228 | max &= ~(call->conn->size_align - 1UL); | |
0b58b8a1 | 229 | |
df423a4a DH |
230 | chunk = max; |
231 | if (chunk > msg_data_left(msg) && !more) | |
232 | chunk = msg_data_left(msg); | |
0b58b8a1 | 233 | |
df423a4a DH |
234 | space = chunk + call->conn->size_align; |
235 | space &= ~(call->conn->size_align - 1UL); | |
0b58b8a1 | 236 | |
5a924b89 | 237 | size = space + call->conn->security_size; |
0b58b8a1 | 238 | |
df423a4a | 239 | _debug("SIZE: %zu/%zu/%zu", chunk, space, size); |
0b58b8a1 | 240 | |
df423a4a DH |
241 | /* create a buffer that we can retain until it's ACK'd */ |
242 | skb = sock_alloc_send_skb( | |
243 | sk, size, msg->msg_flags & MSG_DONTWAIT, &ret); | |
244 | if (!skb) | |
245 | goto maybe_error; | |
0b58b8a1 | 246 | |
71f3ca40 | 247 | rxrpc_new_skb(skb, rxrpc_skb_tx_new); |
0b58b8a1 | 248 | |
df423a4a | 249 | _debug("ALLOC SEND %p", skb); |
0b58b8a1 | 250 | |
df423a4a | 251 | ASSERTCMP(skb->mark, ==, 0); |
0b58b8a1 | 252 | |
5a924b89 DH |
253 | _debug("HS: %u", call->conn->security_size); |
254 | skb_reserve(skb, call->conn->security_size); | |
255 | skb->len += call->conn->security_size; | |
0b58b8a1 | 256 | |
df423a4a DH |
257 | sp = rxrpc_skb(skb); |
258 | sp->remain = chunk; | |
259 | if (sp->remain > skb_tailroom(skb)) | |
260 | sp->remain = skb_tailroom(skb); | |
0b58b8a1 | 261 | |
df423a4a DH |
262 | _net("skb: hr %d, tr %d, hl %d, rm %d", |
263 | skb_headroom(skb), | |
264 | skb_tailroom(skb), | |
265 | skb_headlen(skb), | |
266 | sp->remain); | |
0b58b8a1 | 267 | |
df423a4a DH |
268 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
269 | } | |
0b58b8a1 | 270 | |
df423a4a DH |
271 | _debug("append"); |
272 | sp = rxrpc_skb(skb); | |
0b58b8a1 | 273 | |
df423a4a DH |
274 | /* append next segment of data to the current buffer */ |
275 | if (msg_data_left(msg) > 0) { | |
276 | int copy = skb_tailroom(skb); | |
277 | ASSERTCMP(copy, >, 0); | |
278 | if (copy > msg_data_left(msg)) | |
279 | copy = msg_data_left(msg); | |
280 | if (copy > sp->remain) | |
281 | copy = sp->remain; | |
0b58b8a1 | 282 | |
df423a4a DH |
283 | _debug("add"); |
284 | ret = skb_add_data(skb, &msg->msg_iter, copy); | |
285 | _debug("added"); | |
286 | if (ret < 0) | |
287 | goto efault; | |
288 | sp->remain -= copy; | |
289 | skb->mark += copy; | |
290 | copied += copy; | |
0b58b8a1 DH |
291 | } |
292 | ||
df423a4a DH |
293 | /* check for the far side aborting the call or a network error |
294 | * occurring */ | |
295 | if (call->state == RXRPC_CALL_COMPLETE) | |
296 | goto call_terminated; | |
0b58b8a1 | 297 | |
df423a4a DH |
298 | /* add the packet to the send queue if it's now full */ |
299 | if (sp->remain <= 0 || | |
300 | (msg_data_left(msg) == 0 && !more)) { | |
301 | struct rxrpc_connection *conn = call->conn; | |
302 | uint32_t seq; | |
303 | size_t pad; | |
0b58b8a1 | 304 | |
df423a4a DH |
305 | /* pad out if we're using security */ |
306 | if (conn->security_ix) { | |
307 | pad = conn->security_size + skb->mark; | |
308 | pad = conn->size_align - pad; | |
309 | pad &= conn->size_align - 1; | |
310 | _debug("pad %zu", pad); | |
311 | if (pad) | |
312 | memset(skb_put(skb, pad), 0, pad); | |
313 | } | |
0b58b8a1 | 314 | |
248f219c | 315 | seq = call->tx_top + 1; |
0b58b8a1 | 316 | |
df423a4a | 317 | sp->hdr.seq = seq; |
df423a4a | 318 | sp->hdr._rsvd = 0; |
5a924b89 | 319 | sp->hdr.flags = conn->out_clientflag; |
0b58b8a1 | 320 | |
df423a4a DH |
321 | if (msg_data_left(msg) == 0 && !more) |
322 | sp->hdr.flags |= RXRPC_LAST_PACKET; | |
248f219c DH |
323 | else if (call->tx_top - call->tx_hard_ack < |
324 | call->tx_winsize) | |
df423a4a | 325 | sp->hdr.flags |= RXRPC_MORE_PACKETS; |
0b58b8a1 | 326 | |
df423a4a | 327 | ret = conn->security->secure_packet( |
5a924b89 | 328 | call, skb, skb->mark, skb->head); |
df423a4a DH |
329 | if (ret < 0) |
330 | goto out; | |
0b58b8a1 | 331 | |
df423a4a DH |
332 | rxrpc_queue_packet(call, skb, !msg_data_left(msg) && !more); |
333 | skb = NULL; | |
334 | } | |
335 | } while (msg_data_left(msg) > 0); | |
0b58b8a1 | 336 | |
df423a4a DH |
337 | success: |
338 | ret = copied; | |
339 | out: | |
340 | call->tx_pending = skb; | |
341 | _leave(" = %d", ret); | |
342 | return ret; | |
0b58b8a1 | 343 | |
df423a4a | 344 | call_terminated: |
71f3ca40 | 345 | rxrpc_free_skb(skb, rxrpc_skb_tx_freed); |
df423a4a | 346 | _leave(" = %d", -call->error); |
248f219c | 347 | return -call->error; |
0b58b8a1 | 348 | |
df423a4a DH |
349 | maybe_error: |
350 | if (copied) | |
351 | goto success; | |
352 | goto out; | |
0b58b8a1 | 353 | |
df423a4a DH |
354 | efault: |
355 | ret = -EFAULT; | |
356 | goto out; | |
0b58b8a1 DH |
357 | } |
358 | ||
359 | /* | |
df423a4a | 360 | * extract control messages from the sendmsg() control buffer |
0b58b8a1 | 361 | */ |
df423a4a DH |
362 | static int rxrpc_sendmsg_cmsg(struct msghdr *msg, |
363 | unsigned long *user_call_ID, | |
364 | enum rxrpc_command *command, | |
365 | u32 *abort_code, | |
366 | bool *_exclusive) | |
0b58b8a1 | 367 | { |
df423a4a DH |
368 | struct cmsghdr *cmsg; |
369 | bool got_user_ID = false; | |
370 | int len; | |
0b58b8a1 | 371 | |
df423a4a | 372 | *command = RXRPC_CMD_SEND_DATA; |
0b58b8a1 | 373 | |
df423a4a DH |
374 | if (msg->msg_controllen == 0) |
375 | return -EINVAL; | |
0b58b8a1 | 376 | |
df423a4a DH |
377 | for_each_cmsghdr(cmsg, msg) { |
378 | if (!CMSG_OK(msg, cmsg)) | |
379 | return -EINVAL; | |
0b58b8a1 | 380 | |
1ff8cebf | 381 | len = cmsg->cmsg_len - sizeof(struct cmsghdr); |
df423a4a DH |
382 | _debug("CMSG %d, %d, %d", |
383 | cmsg->cmsg_level, cmsg->cmsg_type, len); | |
0b58b8a1 | 384 | |
df423a4a DH |
385 | if (cmsg->cmsg_level != SOL_RXRPC) |
386 | continue; | |
0b58b8a1 | 387 | |
df423a4a DH |
388 | switch (cmsg->cmsg_type) { |
389 | case RXRPC_USER_CALL_ID: | |
390 | if (msg->msg_flags & MSG_CMSG_COMPAT) { | |
391 | if (len != sizeof(u32)) | |
392 | return -EINVAL; | |
393 | *user_call_ID = *(u32 *) CMSG_DATA(cmsg); | |
394 | } else { | |
395 | if (len != sizeof(unsigned long)) | |
396 | return -EINVAL; | |
397 | *user_call_ID = *(unsigned long *) | |
398 | CMSG_DATA(cmsg); | |
399 | } | |
400 | _debug("User Call ID %lx", *user_call_ID); | |
401 | got_user_ID = true; | |
402 | break; | |
0b58b8a1 | 403 | |
df423a4a DH |
404 | case RXRPC_ABORT: |
405 | if (*command != RXRPC_CMD_SEND_DATA) | |
406 | return -EINVAL; | |
407 | *command = RXRPC_CMD_SEND_ABORT; | |
408 | if (len != sizeof(*abort_code)) | |
409 | return -EINVAL; | |
410 | *abort_code = *(unsigned int *) CMSG_DATA(cmsg); | |
411 | _debug("Abort %x", *abort_code); | |
412 | if (*abort_code == 0) | |
413 | return -EINVAL; | |
414 | break; | |
0b58b8a1 | 415 | |
df423a4a DH |
416 | case RXRPC_ACCEPT: |
417 | if (*command != RXRPC_CMD_SEND_DATA) | |
418 | return -EINVAL; | |
419 | *command = RXRPC_CMD_ACCEPT; | |
420 | if (len != 0) | |
421 | return -EINVAL; | |
422 | break; | |
0b58b8a1 | 423 | |
df423a4a DH |
424 | case RXRPC_EXCLUSIVE_CALL: |
425 | *_exclusive = true; | |
426 | if (len != 0) | |
427 | return -EINVAL; | |
428 | break; | |
429 | default: | |
430 | return -EINVAL; | |
431 | } | |
432 | } | |
0b58b8a1 | 433 | |
df423a4a DH |
434 | if (!got_user_ID) |
435 | return -EINVAL; | |
436 | _leave(" = 0"); | |
437 | return 0; | |
438 | } | |
0b58b8a1 | 439 | |
df423a4a DH |
440 | /* |
441 | * Create a new client call for sendmsg(). | |
442 | */ | |
443 | static struct rxrpc_call * | |
444 | rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, | |
445 | unsigned long user_call_ID, bool exclusive) | |
446 | { | |
447 | struct rxrpc_conn_parameters cp; | |
448 | struct rxrpc_call *call; | |
449 | struct key *key; | |
0b58b8a1 | 450 | |
df423a4a | 451 | DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name); |
0b58b8a1 | 452 | |
df423a4a | 453 | _enter(""); |
0b58b8a1 | 454 | |
df423a4a DH |
455 | if (!msg->msg_name) |
456 | return ERR_PTR(-EDESTADDRREQ); | |
0b58b8a1 | 457 | |
df423a4a DH |
458 | key = rx->key; |
459 | if (key && !rx->key->payload.data[0]) | |
460 | key = NULL; | |
0b58b8a1 | 461 | |
df423a4a DH |
462 | memset(&cp, 0, sizeof(cp)); |
463 | cp.local = rx->local; | |
464 | cp.key = rx->key; | |
465 | cp.security_level = rx->min_sec_level; | |
466 | cp.exclusive = rx->exclusive | exclusive; | |
467 | cp.service_id = srx->srx_service; | |
468 | call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, GFP_KERNEL); | |
0b58b8a1 | 469 | |
df423a4a DH |
470 | _leave(" = %p\n", call); |
471 | return call; | |
472 | } | |
0b58b8a1 | 473 | |
df423a4a DH |
474 | /* |
475 | * send a message forming part of a client call through an RxRPC socket | |
476 | * - caller holds the socket locked | |
477 | * - the socket may be either a client socket or a server socket | |
478 | */ | |
479 | int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len) | |
480 | { | |
481 | enum rxrpc_command cmd; | |
482 | struct rxrpc_call *call; | |
483 | unsigned long user_call_ID = 0; | |
484 | bool exclusive = false; | |
485 | u32 abort_code = 0; | |
486 | int ret; | |
0b58b8a1 | 487 | |
df423a4a | 488 | _enter(""); |
0b58b8a1 | 489 | |
df423a4a DH |
490 | ret = rxrpc_sendmsg_cmsg(msg, &user_call_ID, &cmd, &abort_code, |
491 | &exclusive); | |
492 | if (ret < 0) | |
493 | return ret; | |
0b58b8a1 | 494 | |
df423a4a DH |
495 | if (cmd == RXRPC_CMD_ACCEPT) { |
496 | if (rx->sk.sk_state != RXRPC_SERVER_LISTENING) | |
497 | return -EINVAL; | |
498 | call = rxrpc_accept_call(rx, user_call_ID, NULL); | |
499 | if (IS_ERR(call)) | |
500 | return PTR_ERR(call); | |
fff72429 | 501 | rxrpc_put_call(call, rxrpc_call_put); |
df423a4a DH |
502 | return 0; |
503 | } | |
0b58b8a1 | 504 | |
df423a4a DH |
505 | call = rxrpc_find_call_by_user_ID(rx, user_call_ID); |
506 | if (!call) { | |
507 | if (cmd != RXRPC_CMD_SEND_DATA) | |
508 | return -EBADSLT; | |
509 | call = rxrpc_new_client_call_for_sendmsg(rx, msg, user_call_ID, | |
510 | exclusive); | |
511 | if (IS_ERR(call)) | |
512 | return PTR_ERR(call); | |
513 | } | |
0b58b8a1 | 514 | |
df423a4a DH |
515 | _debug("CALL %d USR %lx ST %d on CONN %p", |
516 | call->debug_id, call->user_call_ID, call->state, call->conn); | |
0b58b8a1 | 517 | |
df423a4a DH |
518 | if (call->state >= RXRPC_CALL_COMPLETE) { |
519 | /* it's too late for this call */ | |
520 | ret = -ESHUTDOWN; | |
521 | } else if (cmd == RXRPC_CMD_SEND_ABORT) { | |
df423a4a | 522 | ret = 0; |
248f219c | 523 | if (rxrpc_abort_call("CMD", call, 0, abort_code, ECONNABORTED)) |
26cb02aa | 524 | ret = rxrpc_send_abort_packet(call); |
df423a4a DH |
525 | } else if (cmd != RXRPC_CMD_SEND_DATA) { |
526 | ret = -EINVAL; | |
527 | } else if (rxrpc_is_client_call(call) && | |
528 | call->state != RXRPC_CALL_CLIENT_SEND_REQUEST) { | |
529 | /* request phase complete for this client call */ | |
530 | ret = -EPROTO; | |
531 | } else if (rxrpc_is_service_call(call) && | |
532 | call->state != RXRPC_CALL_SERVER_ACK_REQUEST && | |
533 | call->state != RXRPC_CALL_SERVER_SEND_REPLY) { | |
534 | /* Reply phase not begun or not complete for service call. */ | |
535 | ret = -EPROTO; | |
536 | } else { | |
537 | ret = rxrpc_send_data(rx, call, msg, len); | |
538 | } | |
0b58b8a1 | 539 | |
fff72429 | 540 | rxrpc_put_call(call, rxrpc_call_put); |
df423a4a DH |
541 | _leave(" = %d", ret); |
542 | return ret; | |
543 | } | |
0b58b8a1 | 544 | |
df423a4a DH |
545 | /** |
546 | * rxrpc_kernel_send_data - Allow a kernel service to send data on a call | |
547 | * @sock: The socket the call is on | |
548 | * @call: The call to send data through | |
549 | * @msg: The data to send | |
550 | * @len: The amount of data to send | |
551 | * | |
552 | * Allow a kernel service to send data on a call. The call must be in an state | |
553 | * appropriate to sending data. No control data should be supplied in @msg, | |
554 | * nor should an address be supplied. MSG_MORE should be flagged if there's | |
555 | * more data to come, otherwise this data will end the transmission phase. | |
556 | */ | |
557 | int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call, | |
558 | struct msghdr *msg, size_t len) | |
559 | { | |
560 | int ret; | |
0b58b8a1 | 561 | |
df423a4a | 562 | _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]); |
0b58b8a1 | 563 | |
df423a4a DH |
564 | ASSERTCMP(msg->msg_name, ==, NULL); |
565 | ASSERTCMP(msg->msg_control, ==, NULL); | |
0b58b8a1 | 566 | |
df423a4a | 567 | lock_sock(sock->sk); |
0b58b8a1 | 568 | |
df423a4a DH |
569 | _debug("CALL %d USR %lx ST %d on CONN %p", |
570 | call->debug_id, call->user_call_ID, call->state, call->conn); | |
0b58b8a1 | 571 | |
df423a4a DH |
572 | if (call->state >= RXRPC_CALL_COMPLETE) { |
573 | ret = -ESHUTDOWN; /* it's too late for this call */ | |
574 | } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST && | |
575 | call->state != RXRPC_CALL_SERVER_ACK_REQUEST && | |
576 | call->state != RXRPC_CALL_SERVER_SEND_REPLY) { | |
577 | ret = -EPROTO; /* request phase complete for this client call */ | |
578 | } else { | |
579 | ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len); | |
580 | } | |
581 | ||
582 | release_sock(sock->sk); | |
0b58b8a1 DH |
583 | _leave(" = %d", ret); |
584 | return ret; | |
df423a4a DH |
585 | } |
586 | EXPORT_SYMBOL(rxrpc_kernel_send_data); | |
0b58b8a1 | 587 | |
df423a4a DH |
588 | /** |
589 | * rxrpc_kernel_abort_call - Allow a kernel service to abort a call | |
590 | * @sock: The socket the call is on | |
591 | * @call: The call to be aborted | |
592 | * @abort_code: The abort code to stick into the ABORT packet | |
5a42976d DH |
593 | * @error: Local error value |
594 | * @why: 3-char string indicating why. | |
df423a4a DH |
595 | * |
596 | * Allow a kernel service to abort a call, if it's still in an abortable state. | |
597 | */ | |
598 | void rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call, | |
5a42976d | 599 | u32 abort_code, int error, const char *why) |
df423a4a | 600 | { |
5a42976d | 601 | _enter("{%d},%d,%d,%s", call->debug_id, abort_code, error, why); |
0b58b8a1 | 602 | |
df423a4a | 603 | lock_sock(sock->sk); |
0b58b8a1 | 604 | |
248f219c | 605 | if (rxrpc_abort_call(why, call, 0, abort_code, error)) |
26cb02aa | 606 | rxrpc_send_abort_packet(call); |
df423a4a DH |
607 | |
608 | release_sock(sock->sk); | |
609 | _leave(""); | |
0b58b8a1 | 610 | } |
df423a4a DH |
611 | |
612 | EXPORT_SYMBOL(rxrpc_kernel_abort_call); |