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