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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> | |
0b58b8a1 DH |
18 | #include <net/sock.h> |
19 | #include <net/af_rxrpc.h> | |
20 | #include "ar-internal.h" | |
21 | ||
3dc20f09 DH |
22 | enum rxrpc_command { |
23 | RXRPC_CMD_SEND_DATA, /* send data message */ | |
24 | RXRPC_CMD_SEND_ABORT, /* request abort generation */ | |
25 | RXRPC_CMD_ACCEPT, /* [server] accept incoming call */ | |
26 | RXRPC_CMD_REJECT_BUSY, /* [server] reject a call as busy */ | |
27 | }; | |
28 | ||
0b58b8a1 | 29 | /* |
df423a4a DH |
30 | * wait for space to appear in the transmit/ACK window |
31 | * - caller holds the socket locked | |
0b58b8a1 | 32 | */ |
df423a4a DH |
33 | static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx, |
34 | struct rxrpc_call *call, | |
35 | long *timeo) | |
0b58b8a1 | 36 | { |
df423a4a DH |
37 | DECLARE_WAITQUEUE(myself, current); |
38 | int ret; | |
0b58b8a1 | 39 | |
248f219c DH |
40 | _enter(",{%u,%u,%u}", |
41 | call->tx_hard_ack, call->tx_top, call->tx_winsize); | |
0b58b8a1 | 42 | |
df423a4a | 43 | add_wait_queue(&call->waitq, &myself); |
0b58b8a1 | 44 | |
df423a4a DH |
45 | for (;;) { |
46 | set_current_state(TASK_INTERRUPTIBLE); | |
47 | ret = 0; | |
57494343 DH |
48 | if (call->tx_top - call->tx_hard_ack < |
49 | min_t(unsigned int, call->tx_winsize, | |
50 | call->cong_cwnd + call->cong_extra)) | |
0b58b8a1 | 51 | break; |
248f219c DH |
52 | if (call->state >= RXRPC_CALL_COMPLETE) { |
53 | ret = -call->error; | |
54 | break; | |
55 | } | |
df423a4a DH |
56 | if (signal_pending(current)) { |
57 | ret = sock_intr_errno(*timeo); | |
0b58b8a1 | 58 | break; |
0b58b8a1 | 59 | } |
df423a4a | 60 | |
a124fe3e | 61 | trace_rxrpc_transmit(call, rxrpc_transmit_wait); |
df423a4a DH |
62 | release_sock(&rx->sk); |
63 | *timeo = schedule_timeout(*timeo); | |
64 | lock_sock(&rx->sk); | |
0b58b8a1 DH |
65 | } |
66 | ||
df423a4a DH |
67 | remove_wait_queue(&call->waitq, &myself); |
68 | set_current_state(TASK_RUNNING); | |
69 | _leave(" = %d", ret); | |
70 | return ret; | |
0b58b8a1 DH |
71 | } |
72 | ||
73 | /* | |
248f219c | 74 | * Schedule an instant Tx resend. |
0b58b8a1 | 75 | */ |
248f219c | 76 | static inline void rxrpc_instant_resend(struct rxrpc_call *call, int ix) |
0b58b8a1 | 77 | { |
248f219c DH |
78 | spin_lock_bh(&call->lock); |
79 | ||
80 | if (call->state < RXRPC_CALL_COMPLETE) { | |
81 | call->rxtx_annotations[ix] = RXRPC_TX_ANNO_RETRANS; | |
82 | if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) | |
df423a4a | 83 | rxrpc_queue_call(call); |
0b58b8a1 | 84 | } |
248f219c DH |
85 | |
86 | spin_unlock_bh(&call->lock); | |
0b58b8a1 DH |
87 | } |
88 | ||
89 | /* | |
248f219c DH |
90 | * Queue a DATA packet for transmission, set the resend timeout and send the |
91 | * packet immediately | |
0b58b8a1 | 92 | */ |
df423a4a DH |
93 | static void rxrpc_queue_packet(struct rxrpc_call *call, struct sk_buff *skb, |
94 | bool last) | |
0b58b8a1 | 95 | { |
df423a4a | 96 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
248f219c DH |
97 | rxrpc_seq_t seq = sp->hdr.seq; |
98 | int ret, ix; | |
70790dbe | 99 | u8 annotation = RXRPC_TX_ANNO_UNACK; |
248f219c DH |
100 | |
101 | _net("queue skb %p [%d]", skb, seq); | |
0b58b8a1 | 102 | |
248f219c | 103 | ASSERTCMP(seq, ==, call->tx_top + 1); |
0b58b8a1 | 104 | |
70790dbe DH |
105 | if (last) |
106 | annotation |= RXRPC_TX_ANNO_LAST; | |
107 | ||
b24d2891 DH |
108 | /* We have to set the timestamp before queueing as the retransmit |
109 | * algorithm can see the packet as soon as we queue it. | |
110 | */ | |
111 | skb->tstamp = ktime_get_real(); | |
112 | ||
248f219c | 113 | ix = seq & RXRPC_RXTX_BUFF_MASK; |
71f3ca40 | 114 | rxrpc_get_skb(skb, rxrpc_skb_tx_got); |
70790dbe | 115 | call->rxtx_annotations[ix] = annotation; |
df423a4a | 116 | smp_wmb(); |
248f219c DH |
117 | call->rxtx_buffer[ix] = skb; |
118 | call->tx_top = seq; | |
70790dbe | 119 | if (last) |
a124fe3e | 120 | trace_rxrpc_transmit(call, rxrpc_transmit_queue_last); |
70790dbe | 121 | else |
a124fe3e | 122 | trace_rxrpc_transmit(call, rxrpc_transmit_queue); |
0b58b8a1 | 123 | |
df423a4a DH |
124 | if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) { |
125 | _debug("________awaiting reply/ACK__________"); | |
126 | write_lock_bh(&call->state_lock); | |
127 | switch (call->state) { | |
128 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
129 | call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY; | |
130 | break; | |
131 | case RXRPC_CALL_SERVER_ACK_REQUEST: | |
132 | call->state = RXRPC_CALL_SERVER_SEND_REPLY; | |
133 | if (!last) | |
134 | break; | |
135 | case RXRPC_CALL_SERVER_SEND_REPLY: | |
136 | call->state = RXRPC_CALL_SERVER_AWAIT_ACK; | |
137 | break; | |
138 | default: | |
139 | break; | |
140 | } | |
141 | write_unlock_bh(&call->state_lock); | |
142 | } | |
0b58b8a1 | 143 | |
248f219c DH |
144 | if (seq == 1 && rxrpc_is_client_call(call)) |
145 | rxrpc_expose_client_call(call); | |
df423a4a | 146 | |
a1767077 | 147 | ret = rxrpc_send_data_packet(call, skb, false); |
df423a4a DH |
148 | if (ret < 0) { |
149 | _debug("need instant resend %d", ret); | |
248f219c | 150 | rxrpc_instant_resend(call, ix); |
dfc3da44 | 151 | } else { |
df0adc78 | 152 | ktime_t now = ktime_get_real(), resend_at; |
dfc3da44 | 153 | |
df0adc78 | 154 | resend_at = ktime_add_ms(now, rxrpc_resend_timeout); |
dfc3da44 | 155 | |
df0adc78 | 156 | if (ktime_before(resend_at, call->resend_at)) { |
dfc3da44 | 157 | call->resend_at = resend_at; |
df0adc78 | 158 | rxrpc_set_timer(call, rxrpc_timer_set_for_send, now); |
dfc3da44 | 159 | } |
df423a4a DH |
160 | } |
161 | ||
71f3ca40 | 162 | rxrpc_free_skb(skb, rxrpc_skb_tx_freed); |
df423a4a | 163 | _leave(""); |
0b58b8a1 DH |
164 | } |
165 | ||
df423a4a DH |
166 | /* |
167 | * send data through a socket | |
168 | * - must be called in process context | |
0b58b8a1 | 169 | * - caller holds the socket locked |
0b58b8a1 | 170 | */ |
df423a4a DH |
171 | static int rxrpc_send_data(struct rxrpc_sock *rx, |
172 | struct rxrpc_call *call, | |
173 | struct msghdr *msg, size_t len) | |
0b58b8a1 | 174 | { |
df423a4a DH |
175 | struct rxrpc_skb_priv *sp; |
176 | struct sk_buff *skb; | |
177 | struct sock *sk = &rx->sk; | |
178 | long timeo; | |
179 | bool more; | |
180 | int ret, copied; | |
0b58b8a1 | 181 | |
df423a4a | 182 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
0b58b8a1 | 183 | |
df423a4a DH |
184 | /* this should be in poll */ |
185 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); | |
0b58b8a1 | 186 | |
df423a4a DH |
187 | if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) |
188 | return -EPIPE; | |
0b58b8a1 | 189 | |
df423a4a | 190 | more = msg->msg_flags & MSG_MORE; |
0b58b8a1 | 191 | |
df423a4a DH |
192 | skb = call->tx_pending; |
193 | call->tx_pending = NULL; | |
71f3ca40 | 194 | rxrpc_see_skb(skb, rxrpc_skb_tx_seen); |
0b58b8a1 | 195 | |
df423a4a DH |
196 | copied = 0; |
197 | do { | |
7aa51da7 DH |
198 | /* Check to see if there's a ping ACK to reply to. */ |
199 | if (call->ackr_reason == RXRPC_ACK_PING_RESPONSE) | |
a5af7e1f | 200 | rxrpc_send_ack_packet(call, false); |
7aa51da7 | 201 | |
df423a4a DH |
202 | if (!skb) { |
203 | size_t size, chunk, max, space; | |
0b58b8a1 | 204 | |
df423a4a | 205 | _debug("alloc"); |
0b58b8a1 | 206 | |
248f219c | 207 | if (call->tx_top - call->tx_hard_ack >= |
57494343 DH |
208 | min_t(unsigned int, call->tx_winsize, |
209 | call->cong_cwnd + call->cong_extra)) { | |
df423a4a DH |
210 | ret = -EAGAIN; |
211 | if (msg->msg_flags & MSG_DONTWAIT) | |
212 | goto maybe_error; | |
213 | ret = rxrpc_wait_for_tx_window(rx, call, | |
214 | &timeo); | |
215 | if (ret < 0) | |
216 | goto maybe_error; | |
217 | } | |
0b58b8a1 | 218 | |
182f5056 | 219 | max = RXRPC_JUMBO_DATALEN; |
df423a4a DH |
220 | max -= call->conn->security_size; |
221 | max &= ~(call->conn->size_align - 1UL); | |
0b58b8a1 | 222 | |
df423a4a DH |
223 | chunk = max; |
224 | if (chunk > msg_data_left(msg) && !more) | |
225 | chunk = msg_data_left(msg); | |
0b58b8a1 | 226 | |
df423a4a DH |
227 | space = chunk + call->conn->size_align; |
228 | space &= ~(call->conn->size_align - 1UL); | |
0b58b8a1 | 229 | |
5a924b89 | 230 | size = space + call->conn->security_size; |
0b58b8a1 | 231 | |
df423a4a | 232 | _debug("SIZE: %zu/%zu/%zu", chunk, space, size); |
0b58b8a1 | 233 | |
df423a4a DH |
234 | /* create a buffer that we can retain until it's ACK'd */ |
235 | skb = sock_alloc_send_skb( | |
236 | sk, size, msg->msg_flags & MSG_DONTWAIT, &ret); | |
237 | if (!skb) | |
238 | goto maybe_error; | |
0b58b8a1 | 239 | |
71f3ca40 | 240 | rxrpc_new_skb(skb, rxrpc_skb_tx_new); |
0b58b8a1 | 241 | |
df423a4a | 242 | _debug("ALLOC SEND %p", skb); |
0b58b8a1 | 243 | |
df423a4a | 244 | ASSERTCMP(skb->mark, ==, 0); |
0b58b8a1 | 245 | |
5a924b89 DH |
246 | _debug("HS: %u", call->conn->security_size); |
247 | skb_reserve(skb, call->conn->security_size); | |
248 | skb->len += call->conn->security_size; | |
0b58b8a1 | 249 | |
df423a4a DH |
250 | sp = rxrpc_skb(skb); |
251 | sp->remain = chunk; | |
252 | if (sp->remain > skb_tailroom(skb)) | |
253 | sp->remain = skb_tailroom(skb); | |
0b58b8a1 | 254 | |
df423a4a DH |
255 | _net("skb: hr %d, tr %d, hl %d, rm %d", |
256 | skb_headroom(skb), | |
257 | skb_tailroom(skb), | |
258 | skb_headlen(skb), | |
259 | sp->remain); | |
0b58b8a1 | 260 | |
df423a4a DH |
261 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
262 | } | |
0b58b8a1 | 263 | |
df423a4a DH |
264 | _debug("append"); |
265 | sp = rxrpc_skb(skb); | |
0b58b8a1 | 266 | |
df423a4a DH |
267 | /* append next segment of data to the current buffer */ |
268 | if (msg_data_left(msg) > 0) { | |
269 | int copy = skb_tailroom(skb); | |
270 | ASSERTCMP(copy, >, 0); | |
271 | if (copy > msg_data_left(msg)) | |
272 | copy = msg_data_left(msg); | |
273 | if (copy > sp->remain) | |
274 | copy = sp->remain; | |
0b58b8a1 | 275 | |
df423a4a DH |
276 | _debug("add"); |
277 | ret = skb_add_data(skb, &msg->msg_iter, copy); | |
278 | _debug("added"); | |
279 | if (ret < 0) | |
280 | goto efault; | |
281 | sp->remain -= copy; | |
282 | skb->mark += copy; | |
283 | copied += copy; | |
0b58b8a1 DH |
284 | } |
285 | ||
df423a4a DH |
286 | /* check for the far side aborting the call or a network error |
287 | * occurring */ | |
288 | if (call->state == RXRPC_CALL_COMPLETE) | |
289 | goto call_terminated; | |
0b58b8a1 | 290 | |
df423a4a DH |
291 | /* add the packet to the send queue if it's now full */ |
292 | if (sp->remain <= 0 || | |
293 | (msg_data_left(msg) == 0 && !more)) { | |
294 | struct rxrpc_connection *conn = call->conn; | |
295 | uint32_t seq; | |
296 | size_t pad; | |
0b58b8a1 | 297 | |
df423a4a DH |
298 | /* pad out if we're using security */ |
299 | if (conn->security_ix) { | |
300 | pad = conn->security_size + skb->mark; | |
301 | pad = conn->size_align - pad; | |
302 | pad &= conn->size_align - 1; | |
303 | _debug("pad %zu", pad); | |
304 | if (pad) | |
305 | memset(skb_put(skb, pad), 0, pad); | |
306 | } | |
0b58b8a1 | 307 | |
248f219c | 308 | seq = call->tx_top + 1; |
0b58b8a1 | 309 | |
df423a4a | 310 | sp->hdr.seq = seq; |
df423a4a | 311 | sp->hdr._rsvd = 0; |
5a924b89 | 312 | sp->hdr.flags = conn->out_clientflag; |
0b58b8a1 | 313 | |
df423a4a DH |
314 | if (msg_data_left(msg) == 0 && !more) |
315 | sp->hdr.flags |= RXRPC_LAST_PACKET; | |
248f219c DH |
316 | else if (call->tx_top - call->tx_hard_ack < |
317 | call->tx_winsize) | |
df423a4a | 318 | sp->hdr.flags |= RXRPC_MORE_PACKETS; |
0b58b8a1 | 319 | |
df423a4a | 320 | ret = conn->security->secure_packet( |
5a924b89 | 321 | call, skb, skb->mark, skb->head); |
df423a4a DH |
322 | if (ret < 0) |
323 | goto out; | |
0b58b8a1 | 324 | |
df423a4a DH |
325 | rxrpc_queue_packet(call, skb, !msg_data_left(msg) && !more); |
326 | skb = NULL; | |
327 | } | |
328 | } while (msg_data_left(msg) > 0); | |
0b58b8a1 | 329 | |
df423a4a DH |
330 | success: |
331 | ret = copied; | |
332 | out: | |
333 | call->tx_pending = skb; | |
334 | _leave(" = %d", ret); | |
335 | return ret; | |
0b58b8a1 | 336 | |
df423a4a | 337 | call_terminated: |
71f3ca40 | 338 | rxrpc_free_skb(skb, rxrpc_skb_tx_freed); |
df423a4a | 339 | _leave(" = %d", -call->error); |
248f219c | 340 | return -call->error; |
0b58b8a1 | 341 | |
df423a4a DH |
342 | maybe_error: |
343 | if (copied) | |
344 | goto success; | |
345 | goto out; | |
0b58b8a1 | 346 | |
df423a4a DH |
347 | efault: |
348 | ret = -EFAULT; | |
349 | goto out; | |
0b58b8a1 DH |
350 | } |
351 | ||
352 | /* | |
df423a4a | 353 | * extract control messages from the sendmsg() control buffer |
0b58b8a1 | 354 | */ |
df423a4a DH |
355 | static int rxrpc_sendmsg_cmsg(struct msghdr *msg, |
356 | unsigned long *user_call_ID, | |
357 | enum rxrpc_command *command, | |
358 | u32 *abort_code, | |
359 | bool *_exclusive) | |
0b58b8a1 | 360 | { |
df423a4a DH |
361 | struct cmsghdr *cmsg; |
362 | bool got_user_ID = false; | |
363 | int len; | |
0b58b8a1 | 364 | |
df423a4a | 365 | *command = RXRPC_CMD_SEND_DATA; |
0b58b8a1 | 366 | |
df423a4a DH |
367 | if (msg->msg_controllen == 0) |
368 | return -EINVAL; | |
0b58b8a1 | 369 | |
df423a4a DH |
370 | for_each_cmsghdr(cmsg, msg) { |
371 | if (!CMSG_OK(msg, cmsg)) | |
372 | return -EINVAL; | |
0b58b8a1 | 373 | |
df423a4a DH |
374 | len = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)); |
375 | _debug("CMSG %d, %d, %d", | |
376 | cmsg->cmsg_level, cmsg->cmsg_type, len); | |
0b58b8a1 | 377 | |
df423a4a DH |
378 | if (cmsg->cmsg_level != SOL_RXRPC) |
379 | continue; | |
0b58b8a1 | 380 | |
df423a4a DH |
381 | switch (cmsg->cmsg_type) { |
382 | case RXRPC_USER_CALL_ID: | |
383 | if (msg->msg_flags & MSG_CMSG_COMPAT) { | |
384 | if (len != sizeof(u32)) | |
385 | return -EINVAL; | |
386 | *user_call_ID = *(u32 *) CMSG_DATA(cmsg); | |
387 | } else { | |
388 | if (len != sizeof(unsigned long)) | |
389 | return -EINVAL; | |
390 | *user_call_ID = *(unsigned long *) | |
391 | CMSG_DATA(cmsg); | |
392 | } | |
393 | _debug("User Call ID %lx", *user_call_ID); | |
394 | got_user_ID = true; | |
395 | break; | |
0b58b8a1 | 396 | |
df423a4a DH |
397 | case RXRPC_ABORT: |
398 | if (*command != RXRPC_CMD_SEND_DATA) | |
399 | return -EINVAL; | |
400 | *command = RXRPC_CMD_SEND_ABORT; | |
401 | if (len != sizeof(*abort_code)) | |
402 | return -EINVAL; | |
403 | *abort_code = *(unsigned int *) CMSG_DATA(cmsg); | |
404 | _debug("Abort %x", *abort_code); | |
405 | if (*abort_code == 0) | |
406 | return -EINVAL; | |
407 | break; | |
0b58b8a1 | 408 | |
df423a4a DH |
409 | case RXRPC_ACCEPT: |
410 | if (*command != RXRPC_CMD_SEND_DATA) | |
411 | return -EINVAL; | |
412 | *command = RXRPC_CMD_ACCEPT; | |
413 | if (len != 0) | |
414 | return -EINVAL; | |
415 | break; | |
0b58b8a1 | 416 | |
df423a4a DH |
417 | case RXRPC_EXCLUSIVE_CALL: |
418 | *_exclusive = true; | |
419 | if (len != 0) | |
420 | return -EINVAL; | |
421 | break; | |
422 | default: | |
423 | return -EINVAL; | |
424 | } | |
425 | } | |
0b58b8a1 | 426 | |
df423a4a DH |
427 | if (!got_user_ID) |
428 | return -EINVAL; | |
429 | _leave(" = 0"); | |
430 | return 0; | |
431 | } | |
0b58b8a1 | 432 | |
df423a4a DH |
433 | /* |
434 | * Create a new client call for sendmsg(). | |
435 | */ | |
436 | static struct rxrpc_call * | |
437 | rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, | |
438 | unsigned long user_call_ID, bool exclusive) | |
439 | { | |
440 | struct rxrpc_conn_parameters cp; | |
441 | struct rxrpc_call *call; | |
442 | struct key *key; | |
0b58b8a1 | 443 | |
df423a4a | 444 | DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name); |
0b58b8a1 | 445 | |
df423a4a | 446 | _enter(""); |
0b58b8a1 | 447 | |
df423a4a DH |
448 | if (!msg->msg_name) |
449 | return ERR_PTR(-EDESTADDRREQ); | |
0b58b8a1 | 450 | |
df423a4a DH |
451 | key = rx->key; |
452 | if (key && !rx->key->payload.data[0]) | |
453 | key = NULL; | |
0b58b8a1 | 454 | |
df423a4a DH |
455 | memset(&cp, 0, sizeof(cp)); |
456 | cp.local = rx->local; | |
457 | cp.key = rx->key; | |
458 | cp.security_level = rx->min_sec_level; | |
459 | cp.exclusive = rx->exclusive | exclusive; | |
460 | cp.service_id = srx->srx_service; | |
461 | call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, GFP_KERNEL); | |
0b58b8a1 | 462 | |
df423a4a DH |
463 | _leave(" = %p\n", call); |
464 | return call; | |
465 | } | |
0b58b8a1 | 466 | |
df423a4a DH |
467 | /* |
468 | * send a message forming part of a client call through an RxRPC socket | |
469 | * - caller holds the socket locked | |
470 | * - the socket may be either a client socket or a server socket | |
471 | */ | |
472 | int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len) | |
473 | { | |
474 | enum rxrpc_command cmd; | |
475 | struct rxrpc_call *call; | |
476 | unsigned long user_call_ID = 0; | |
477 | bool exclusive = false; | |
478 | u32 abort_code = 0; | |
479 | int ret; | |
0b58b8a1 | 480 | |
df423a4a | 481 | _enter(""); |
0b58b8a1 | 482 | |
df423a4a DH |
483 | ret = rxrpc_sendmsg_cmsg(msg, &user_call_ID, &cmd, &abort_code, |
484 | &exclusive); | |
485 | if (ret < 0) | |
486 | return ret; | |
0b58b8a1 | 487 | |
df423a4a DH |
488 | if (cmd == RXRPC_CMD_ACCEPT) { |
489 | if (rx->sk.sk_state != RXRPC_SERVER_LISTENING) | |
490 | return -EINVAL; | |
491 | call = rxrpc_accept_call(rx, user_call_ID, NULL); | |
492 | if (IS_ERR(call)) | |
493 | return PTR_ERR(call); | |
fff72429 | 494 | rxrpc_put_call(call, rxrpc_call_put); |
df423a4a DH |
495 | return 0; |
496 | } | |
0b58b8a1 | 497 | |
df423a4a DH |
498 | call = rxrpc_find_call_by_user_ID(rx, user_call_ID); |
499 | if (!call) { | |
500 | if (cmd != RXRPC_CMD_SEND_DATA) | |
501 | return -EBADSLT; | |
502 | call = rxrpc_new_client_call_for_sendmsg(rx, msg, user_call_ID, | |
503 | exclusive); | |
504 | if (IS_ERR(call)) | |
505 | return PTR_ERR(call); | |
506 | } | |
0b58b8a1 | 507 | |
df423a4a DH |
508 | _debug("CALL %d USR %lx ST %d on CONN %p", |
509 | call->debug_id, call->user_call_ID, call->state, call->conn); | |
0b58b8a1 | 510 | |
df423a4a DH |
511 | if (call->state >= RXRPC_CALL_COMPLETE) { |
512 | /* it's too late for this call */ | |
513 | ret = -ESHUTDOWN; | |
514 | } else if (cmd == RXRPC_CMD_SEND_ABORT) { | |
df423a4a | 515 | ret = 0; |
248f219c | 516 | if (rxrpc_abort_call("CMD", call, 0, abort_code, ECONNABORTED)) |
26cb02aa | 517 | ret = rxrpc_send_abort_packet(call); |
df423a4a DH |
518 | } else if (cmd != RXRPC_CMD_SEND_DATA) { |
519 | ret = -EINVAL; | |
520 | } else if (rxrpc_is_client_call(call) && | |
521 | call->state != RXRPC_CALL_CLIENT_SEND_REQUEST) { | |
522 | /* request phase complete for this client call */ | |
523 | ret = -EPROTO; | |
524 | } else if (rxrpc_is_service_call(call) && | |
525 | call->state != RXRPC_CALL_SERVER_ACK_REQUEST && | |
526 | call->state != RXRPC_CALL_SERVER_SEND_REPLY) { | |
527 | /* Reply phase not begun or not complete for service call. */ | |
528 | ret = -EPROTO; | |
529 | } else { | |
530 | ret = rxrpc_send_data(rx, call, msg, len); | |
531 | } | |
0b58b8a1 | 532 | |
fff72429 | 533 | rxrpc_put_call(call, rxrpc_call_put); |
df423a4a DH |
534 | _leave(" = %d", ret); |
535 | return ret; | |
536 | } | |
0b58b8a1 | 537 | |
df423a4a DH |
538 | /** |
539 | * rxrpc_kernel_send_data - Allow a kernel service to send data on a call | |
540 | * @sock: The socket the call is on | |
541 | * @call: The call to send data through | |
542 | * @msg: The data to send | |
543 | * @len: The amount of data to send | |
544 | * | |
545 | * Allow a kernel service to send data on a call. The call must be in an state | |
546 | * appropriate to sending data. No control data should be supplied in @msg, | |
547 | * nor should an address be supplied. MSG_MORE should be flagged if there's | |
548 | * more data to come, otherwise this data will end the transmission phase. | |
549 | */ | |
550 | int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call, | |
551 | struct msghdr *msg, size_t len) | |
552 | { | |
553 | int ret; | |
0b58b8a1 | 554 | |
df423a4a | 555 | _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]); |
0b58b8a1 | 556 | |
df423a4a DH |
557 | ASSERTCMP(msg->msg_name, ==, NULL); |
558 | ASSERTCMP(msg->msg_control, ==, NULL); | |
0b58b8a1 | 559 | |
df423a4a | 560 | lock_sock(sock->sk); |
0b58b8a1 | 561 | |
df423a4a DH |
562 | _debug("CALL %d USR %lx ST %d on CONN %p", |
563 | call->debug_id, call->user_call_ID, call->state, call->conn); | |
0b58b8a1 | 564 | |
df423a4a DH |
565 | if (call->state >= RXRPC_CALL_COMPLETE) { |
566 | ret = -ESHUTDOWN; /* it's too late for this call */ | |
567 | } else if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST && | |
568 | call->state != RXRPC_CALL_SERVER_ACK_REQUEST && | |
569 | call->state != RXRPC_CALL_SERVER_SEND_REPLY) { | |
570 | ret = -EPROTO; /* request phase complete for this client call */ | |
571 | } else { | |
572 | ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len); | |
573 | } | |
574 | ||
575 | release_sock(sock->sk); | |
0b58b8a1 DH |
576 | _leave(" = %d", ret); |
577 | return ret; | |
df423a4a DH |
578 | } |
579 | EXPORT_SYMBOL(rxrpc_kernel_send_data); | |
0b58b8a1 | 580 | |
df423a4a DH |
581 | /** |
582 | * rxrpc_kernel_abort_call - Allow a kernel service to abort a call | |
583 | * @sock: The socket the call is on | |
584 | * @call: The call to be aborted | |
585 | * @abort_code: The abort code to stick into the ABORT packet | |
5a42976d DH |
586 | * @error: Local error value |
587 | * @why: 3-char string indicating why. | |
df423a4a DH |
588 | * |
589 | * Allow a kernel service to abort a call, if it's still in an abortable state. | |
590 | */ | |
591 | void rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call, | |
5a42976d | 592 | u32 abort_code, int error, const char *why) |
df423a4a | 593 | { |
5a42976d | 594 | _enter("{%d},%d,%d,%s", call->debug_id, abort_code, error, why); |
0b58b8a1 | 595 | |
df423a4a | 596 | lock_sock(sock->sk); |
0b58b8a1 | 597 | |
248f219c | 598 | if (rxrpc_abort_call(why, call, 0, abort_code, error)) |
26cb02aa | 599 | rxrpc_send_abort_packet(call); |
df423a4a DH |
600 | |
601 | release_sock(sock->sk); | |
602 | _leave(""); | |
0b58b8a1 | 603 | } |
df423a4a DH |
604 | |
605 | EXPORT_SYMBOL(rxrpc_kernel_abort_call); |