Commit | Line | Data |
---|---|---|
17926a79 DH |
1 | /* RxRPC packet reception |
2 | * | |
3 | * Copyright (C) 2007 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 License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
9b6d5398 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
17926a79 DH |
14 | #include <linux/module.h> |
15 | #include <linux/net.h> | |
16 | #include <linux/skbuff.h> | |
17 | #include <linux/errqueue.h> | |
18 | #include <linux/udp.h> | |
19 | #include <linux/in.h> | |
20 | #include <linux/in6.h> | |
21 | #include <linux/icmp.h> | |
5a0e3ad6 | 22 | #include <linux/gfp.h> |
17926a79 DH |
23 | #include <net/sock.h> |
24 | #include <net/af_rxrpc.h> | |
25 | #include <net/ip.h> | |
1781f7f5 | 26 | #include <net/udp.h> |
0283328e | 27 | #include <net/net_namespace.h> |
17926a79 DH |
28 | #include "ar-internal.h" |
29 | ||
17926a79 DH |
30 | /* |
31 | * queue a packet for recvmsg to pass to userspace | |
32 | * - the caller must hold a lock on call->lock | |
33 | * - must not be called with interrupts disabled (sk_filter() disables BH's) | |
34 | * - eats the packet whether successful or not | |
35 | * - there must be just one reference to the packet, which the caller passes to | |
36 | * this function | |
37 | */ | |
38 | int rxrpc_queue_rcv_skb(struct rxrpc_call *call, struct sk_buff *skb, | |
39 | bool force, bool terminal) | |
40 | { | |
41 | struct rxrpc_skb_priv *sp; | |
651350d1 | 42 | struct rxrpc_sock *rx = call->socket; |
17926a79 | 43 | struct sock *sk; |
884cf705 | 44 | int ret; |
17926a79 DH |
45 | |
46 | _enter(",,%d,%d", force, terminal); | |
47 | ||
48 | ASSERT(!irqs_disabled()); | |
49 | ||
50 | sp = rxrpc_skb(skb); | |
51 | ASSERTCMP(sp->call, ==, call); | |
52 | ||
53 | /* if we've already posted the terminal message for a call, then we | |
54 | * don't post any more */ | |
55 | if (test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) { | |
56 | _debug("already terminated"); | |
57 | ASSERTCMP(call->state, >=, RXRPC_CALL_COMPLETE); | |
17926a79 DH |
58 | rxrpc_free_skb(skb); |
59 | return 0; | |
60 | } | |
61 | ||
651350d1 | 62 | sk = &rx->sk; |
17926a79 DH |
63 | |
64 | if (!force) { | |
65 | /* cast skb->rcvbuf to unsigned... It's pointless, but | |
66 | * reduces number of warnings when compiling with -W | |
67 | * --ANK */ | |
68 | // ret = -ENOBUFS; | |
69 | // if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
95c96174 | 70 | // (unsigned int) sk->sk_rcvbuf) |
17926a79 DH |
71 | // goto out; |
72 | ||
73 | ret = sk_filter(sk, skb); | |
74 | if (ret < 0) | |
75 | goto out; | |
76 | } | |
77 | ||
78 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
79 | if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags) && | |
80 | !test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
81 | call->socket->sk.sk_state != RXRPC_CLOSE) { | |
82 | skb->destructor = rxrpc_packet_destructor; | |
83 | skb->dev = NULL; | |
84 | skb->sk = sk; | |
85 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); | |
86 | ||
17926a79 DH |
87 | if (terminal) { |
88 | _debug("<<<< TERMINAL MESSAGE >>>>"); | |
89 | set_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags); | |
90 | } | |
91 | ||
651350d1 DH |
92 | /* allow interception by a kernel service */ |
93 | if (rx->interceptor) { | |
94 | rx->interceptor(sk, call->user_call_ID, skb); | |
95 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
96 | } else { | |
651350d1 DH |
97 | _net("post skb %p", skb); |
98 | __skb_queue_tail(&sk->sk_receive_queue, skb); | |
99 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
100 | ||
101 | if (!sock_flag(sk, SOCK_DEAD)) | |
676d2369 | 102 | sk->sk_data_ready(sk); |
651350d1 | 103 | } |
17926a79 DH |
104 | skb = NULL; |
105 | } else { | |
106 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
107 | } | |
108 | ret = 0; | |
109 | ||
110 | out: | |
372ee163 | 111 | rxrpc_free_skb(skb); |
17926a79 DH |
112 | |
113 | _leave(" = %d", ret); | |
114 | return ret; | |
115 | } | |
116 | ||
117 | /* | |
118 | * process a DATA packet, posting the packet to the appropriate queue | |
119 | * - eats the packet if successful | |
120 | */ | |
121 | static int rxrpc_fast_process_data(struct rxrpc_call *call, | |
122 | struct sk_buff *skb, u32 seq) | |
123 | { | |
124 | struct rxrpc_skb_priv *sp; | |
125 | bool terminal; | |
126 | int ret, ackbit, ack; | |
127 | ||
128 | _enter("{%u,%u},,{%u}", call->rx_data_post, call->rx_first_oos, seq); | |
129 | ||
130 | sp = rxrpc_skb(skb); | |
131 | ASSERTCMP(sp->call, ==, NULL); | |
132 | ||
133 | spin_lock(&call->lock); | |
134 | ||
135 | if (call->state > RXRPC_CALL_COMPLETE) | |
136 | goto discard; | |
137 | ||
138 | ASSERTCMP(call->rx_data_expect, >=, call->rx_data_post); | |
139 | ASSERTCMP(call->rx_data_post, >=, call->rx_data_recv); | |
140 | ASSERTCMP(call->rx_data_recv, >=, call->rx_data_eaten); | |
141 | ||
142 | if (seq < call->rx_data_post) { | |
143 | _debug("dup #%u [-%u]", seq, call->rx_data_post); | |
144 | ack = RXRPC_ACK_DUPLICATE; | |
145 | ret = -ENOBUFS; | |
146 | goto discard_and_ack; | |
147 | } | |
148 | ||
149 | /* we may already have the packet in the out of sequence queue */ | |
150 | ackbit = seq - (call->rx_data_eaten + 1); | |
151 | ASSERTCMP(ackbit, >=, 0); | |
68c708fd | 152 | if (__test_and_set_bit(ackbit, call->ackr_window)) { |
17926a79 DH |
153 | _debug("dup oos #%u [%u,%u]", |
154 | seq, call->rx_data_eaten, call->rx_data_post); | |
155 | ack = RXRPC_ACK_DUPLICATE; | |
156 | goto discard_and_ack; | |
157 | } | |
158 | ||
159 | if (seq >= call->ackr_win_top) { | |
160 | _debug("exceed #%u [%u]", seq, call->ackr_win_top); | |
68c708fd | 161 | __clear_bit(ackbit, call->ackr_window); |
17926a79 DH |
162 | ack = RXRPC_ACK_EXCEEDS_WINDOW; |
163 | goto discard_and_ack; | |
164 | } | |
165 | ||
166 | if (seq == call->rx_data_expect) { | |
167 | clear_bit(RXRPC_CALL_EXPECT_OOS, &call->flags); | |
168 | call->rx_data_expect++; | |
169 | } else if (seq > call->rx_data_expect) { | |
170 | _debug("oos #%u [%u]", seq, call->rx_data_expect); | |
171 | call->rx_data_expect = seq + 1; | |
172 | if (test_and_set_bit(RXRPC_CALL_EXPECT_OOS, &call->flags)) { | |
173 | ack = RXRPC_ACK_OUT_OF_SEQUENCE; | |
174 | goto enqueue_and_ack; | |
175 | } | |
176 | goto enqueue_packet; | |
177 | } | |
178 | ||
179 | if (seq != call->rx_data_post) { | |
180 | _debug("ahead #%u [%u]", seq, call->rx_data_post); | |
181 | goto enqueue_packet; | |
182 | } | |
183 | ||
184 | if (test_bit(RXRPC_CALL_RCVD_LAST, &call->flags)) | |
185 | goto protocol_error; | |
186 | ||
187 | /* if the packet need security things doing to it, then it goes down | |
188 | * the slow path */ | |
e0e4d82f | 189 | if (call->conn->security_ix) |
17926a79 DH |
190 | goto enqueue_packet; |
191 | ||
192 | sp->call = call; | |
193 | rxrpc_get_call(call); | |
372ee163 | 194 | atomic_inc(&call->skb_count); |
17926a79 DH |
195 | terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) && |
196 | !(sp->hdr.flags & RXRPC_CLIENT_INITIATED)); | |
197 | ret = rxrpc_queue_rcv_skb(call, skb, false, terminal); | |
198 | if (ret < 0) { | |
199 | if (ret == -ENOMEM || ret == -ENOBUFS) { | |
68c708fd | 200 | __clear_bit(ackbit, call->ackr_window); |
17926a79 DH |
201 | ack = RXRPC_ACK_NOSPACE; |
202 | goto discard_and_ack; | |
203 | } | |
204 | goto out; | |
205 | } | |
206 | ||
207 | skb = NULL; | |
208 | ||
209 | _debug("post #%u", seq); | |
210 | ASSERTCMP(call->rx_data_post, ==, seq); | |
211 | call->rx_data_post++; | |
212 | ||
213 | if (sp->hdr.flags & RXRPC_LAST_PACKET) | |
214 | set_bit(RXRPC_CALL_RCVD_LAST, &call->flags); | |
215 | ||
216 | /* if we've reached an out of sequence packet then we need to drain | |
217 | * that queue into the socket Rx queue now */ | |
218 | if (call->rx_data_post == call->rx_first_oos) { | |
219 | _debug("drain rx oos now"); | |
220 | read_lock(&call->state_lock); | |
221 | if (call->state < RXRPC_CALL_COMPLETE && | |
4c198ad1 | 222 | !test_and_set_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events)) |
651350d1 | 223 | rxrpc_queue_call(call); |
17926a79 DH |
224 | read_unlock(&call->state_lock); |
225 | } | |
226 | ||
227 | spin_unlock(&call->lock); | |
228 | atomic_inc(&call->ackr_not_idle); | |
229 | rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, sp->hdr.serial, false); | |
230 | _leave(" = 0 [posted]"); | |
231 | return 0; | |
232 | ||
233 | protocol_error: | |
234 | ret = -EBADMSG; | |
235 | out: | |
236 | spin_unlock(&call->lock); | |
237 | _leave(" = %d", ret); | |
238 | return ret; | |
239 | ||
240 | discard_and_ack: | |
241 | _debug("discard and ACK packet %p", skb); | |
242 | __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true); | |
243 | discard: | |
244 | spin_unlock(&call->lock); | |
245 | rxrpc_free_skb(skb); | |
246 | _leave(" = 0 [discarded]"); | |
247 | return 0; | |
248 | ||
249 | enqueue_and_ack: | |
250 | __rxrpc_propose_ACK(call, ack, sp->hdr.serial, true); | |
251 | enqueue_packet: | |
252 | _net("defer skb %p", skb); | |
253 | spin_unlock(&call->lock); | |
254 | skb_queue_tail(&call->rx_queue, skb); | |
255 | atomic_inc(&call->ackr_not_idle); | |
256 | read_lock(&call->state_lock); | |
257 | if (call->state < RXRPC_CALL_DEAD) | |
651350d1 | 258 | rxrpc_queue_call(call); |
17926a79 DH |
259 | read_unlock(&call->state_lock); |
260 | _leave(" = 0 [queued]"); | |
261 | return 0; | |
262 | } | |
263 | ||
264 | /* | |
265 | * assume an implicit ACKALL of the transmission phase of a client socket upon | |
266 | * reception of the first reply packet | |
267 | */ | |
268 | static void rxrpc_assume_implicit_ackall(struct rxrpc_call *call, u32 serial) | |
269 | { | |
270 | write_lock_bh(&call->state_lock); | |
271 | ||
272 | switch (call->state) { | |
273 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
274 | call->state = RXRPC_CALL_CLIENT_RECV_REPLY; | |
275 | call->acks_latest = serial; | |
276 | ||
277 | _debug("implicit ACKALL %%%u", call->acks_latest); | |
4c198ad1 | 278 | set_bit(RXRPC_CALL_EV_RCVD_ACKALL, &call->events); |
17926a79 DH |
279 | write_unlock_bh(&call->state_lock); |
280 | ||
281 | if (try_to_del_timer_sync(&call->resend_timer) >= 0) { | |
4c198ad1 DH |
282 | clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events); |
283 | clear_bit(RXRPC_CALL_EV_RESEND, &call->events); | |
17926a79 DH |
284 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); |
285 | } | |
286 | break; | |
287 | ||
288 | default: | |
289 | write_unlock_bh(&call->state_lock); | |
290 | break; | |
291 | } | |
292 | } | |
293 | ||
294 | /* | |
295 | * post an incoming packet to the nominated call to deal with | |
296 | * - must get rid of the sk_buff, either by freeing it or by queuing it | |
297 | */ | |
298 | void rxrpc_fast_process_packet(struct rxrpc_call *call, struct sk_buff *skb) | |
299 | { | |
300 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
0d12f8a4 DH |
301 | __be32 wtmp; |
302 | u32 hi_serial, abort_code; | |
17926a79 DH |
303 | |
304 | _enter("%p,%p", call, skb); | |
305 | ||
306 | ASSERT(!irqs_disabled()); | |
307 | ||
308 | #if 0 // INJECT RX ERROR | |
309 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) { | |
310 | static int skip = 0; | |
311 | if (++skip == 3) { | |
312 | printk("DROPPED 3RD PACKET!!!!!!!!!!!!!\n"); | |
313 | skip = 0; | |
314 | goto free_packet; | |
315 | } | |
316 | } | |
317 | #endif | |
318 | ||
319 | /* track the latest serial number on this connection for ACK packet | |
320 | * information */ | |
17926a79 | 321 | hi_serial = atomic_read(&call->conn->hi_serial); |
0d12f8a4 | 322 | while (sp->hdr.serial > hi_serial) |
17926a79 | 323 | hi_serial = atomic_cmpxchg(&call->conn->hi_serial, hi_serial, |
0d12f8a4 | 324 | sp->hdr.serial); |
17926a79 DH |
325 | |
326 | /* request ACK generation for any ACK or DATA packet that requests | |
327 | * it */ | |
328 | if (sp->hdr.flags & RXRPC_REQUEST_ACK) { | |
0d12f8a4 | 329 | _proto("ACK Requested on %%%u", sp->hdr.serial); |
9823f39a | 330 | rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, sp->hdr.serial, false); |
17926a79 DH |
331 | } |
332 | ||
333 | switch (sp->hdr.type) { | |
334 | case RXRPC_PACKET_TYPE_ABORT: | |
335 | _debug("abort"); | |
336 | ||
0d12f8a4 | 337 | if (skb_copy_bits(skb, 0, &wtmp, sizeof(wtmp)) < 0) |
17926a79 DH |
338 | goto protocol_error; |
339 | ||
0d12f8a4 DH |
340 | abort_code = ntohl(wtmp); |
341 | _proto("Rx ABORT %%%u { %x }", sp->hdr.serial, abort_code); | |
17926a79 DH |
342 | |
343 | write_lock_bh(&call->state_lock); | |
344 | if (call->state < RXRPC_CALL_COMPLETE) { | |
345 | call->state = RXRPC_CALL_REMOTELY_ABORTED; | |
dc44b3a0 | 346 | call->remote_abort = abort_code; |
4c198ad1 | 347 | set_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events); |
651350d1 | 348 | rxrpc_queue_call(call); |
17926a79 DH |
349 | } |
350 | goto free_packet_unlock; | |
351 | ||
352 | case RXRPC_PACKET_TYPE_BUSY: | |
0d12f8a4 | 353 | _proto("Rx BUSY %%%u", sp->hdr.serial); |
17926a79 | 354 | |
19ffa01c | 355 | if (rxrpc_conn_is_service(call->conn)) |
17926a79 DH |
356 | goto protocol_error; |
357 | ||
358 | write_lock_bh(&call->state_lock); | |
359 | switch (call->state) { | |
360 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
361 | call->state = RXRPC_CALL_SERVER_BUSY; | |
4c198ad1 | 362 | set_bit(RXRPC_CALL_EV_RCVD_BUSY, &call->events); |
651350d1 | 363 | rxrpc_queue_call(call); |
17926a79 DH |
364 | case RXRPC_CALL_SERVER_BUSY: |
365 | goto free_packet_unlock; | |
366 | default: | |
367 | goto protocol_error_locked; | |
368 | } | |
369 | ||
370 | default: | |
0d12f8a4 | 371 | _proto("Rx %s %%%u", rxrpc_pkts[sp->hdr.type], sp->hdr.serial); |
17926a79 DH |
372 | goto protocol_error; |
373 | ||
374 | case RXRPC_PACKET_TYPE_DATA: | |
0d12f8a4 | 375 | _proto("Rx DATA %%%u { #%u }", sp->hdr.serial, sp->hdr.seq); |
17926a79 | 376 | |
0d12f8a4 | 377 | if (sp->hdr.seq == 0) |
17926a79 DH |
378 | goto protocol_error; |
379 | ||
380 | call->ackr_prev_seq = sp->hdr.seq; | |
381 | ||
382 | /* received data implicitly ACKs all of the request packets we | |
383 | * sent when we're acting as a client */ | |
384 | if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY) | |
0d12f8a4 | 385 | rxrpc_assume_implicit_ackall(call, sp->hdr.serial); |
17926a79 | 386 | |
0d12f8a4 | 387 | switch (rxrpc_fast_process_data(call, skb, sp->hdr.seq)) { |
17926a79 DH |
388 | case 0: |
389 | skb = NULL; | |
390 | goto done; | |
391 | ||
392 | default: | |
393 | BUG(); | |
394 | ||
395 | /* data packet received beyond the last packet */ | |
396 | case -EBADMSG: | |
397 | goto protocol_error; | |
398 | } | |
399 | ||
10003453 | 400 | case RXRPC_PACKET_TYPE_ACKALL: |
17926a79 DH |
401 | case RXRPC_PACKET_TYPE_ACK: |
402 | /* ACK processing is done in process context */ | |
403 | read_lock_bh(&call->state_lock); | |
404 | if (call->state < RXRPC_CALL_DEAD) { | |
405 | skb_queue_tail(&call->rx_queue, skb); | |
651350d1 | 406 | rxrpc_queue_call(call); |
17926a79 DH |
407 | skb = NULL; |
408 | } | |
409 | read_unlock_bh(&call->state_lock); | |
410 | goto free_packet; | |
411 | } | |
412 | ||
413 | protocol_error: | |
414 | _debug("protocol error"); | |
415 | write_lock_bh(&call->state_lock); | |
416 | protocol_error_locked: | |
417 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
418 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
dc44b3a0 | 419 | call->local_abort = RX_PROTOCOL_ERROR; |
4c198ad1 | 420 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
651350d1 | 421 | rxrpc_queue_call(call); |
17926a79 DH |
422 | } |
423 | free_packet_unlock: | |
424 | write_unlock_bh(&call->state_lock); | |
425 | free_packet: | |
426 | rxrpc_free_skb(skb); | |
427 | done: | |
428 | _leave(""); | |
429 | } | |
430 | ||
431 | /* | |
432 | * split up a jumbo data packet | |
433 | */ | |
434 | static void rxrpc_process_jumbo_packet(struct rxrpc_call *call, | |
435 | struct sk_buff *jumbo) | |
436 | { | |
437 | struct rxrpc_jumbo_header jhdr; | |
438 | struct rxrpc_skb_priv *sp; | |
439 | struct sk_buff *part; | |
440 | ||
441 | _enter(",{%u,%u}", jumbo->data_len, jumbo->len); | |
442 | ||
443 | sp = rxrpc_skb(jumbo); | |
444 | ||
445 | do { | |
446 | sp->hdr.flags &= ~RXRPC_JUMBO_PACKET; | |
447 | ||
448 | /* make a clone to represent the first subpacket in what's left | |
449 | * of the jumbo packet */ | |
450 | part = skb_clone(jumbo, GFP_ATOMIC); | |
451 | if (!part) { | |
452 | /* simply ditch the tail in the event of ENOMEM */ | |
453 | pskb_trim(jumbo, RXRPC_JUMBO_DATALEN); | |
454 | break; | |
455 | } | |
456 | rxrpc_new_skb(part); | |
457 | ||
458 | pskb_trim(part, RXRPC_JUMBO_DATALEN); | |
459 | ||
460 | if (!pskb_pull(jumbo, RXRPC_JUMBO_DATALEN)) | |
461 | goto protocol_error; | |
462 | ||
463 | if (skb_copy_bits(jumbo, 0, &jhdr, sizeof(jhdr)) < 0) | |
464 | goto protocol_error; | |
465 | if (!pskb_pull(jumbo, sizeof(jhdr))) | |
466 | BUG(); | |
467 | ||
0d12f8a4 DH |
468 | sp->hdr.seq += 1; |
469 | sp->hdr.serial += 1; | |
17926a79 | 470 | sp->hdr.flags = jhdr.flags; |
ac5d2683 | 471 | sp->hdr._rsvd = ntohs(jhdr._rsvd); |
17926a79 | 472 | |
0d12f8a4 | 473 | _proto("Rx DATA Jumbo %%%u", sp->hdr.serial - 1); |
17926a79 DH |
474 | |
475 | rxrpc_fast_process_packet(call, part); | |
476 | part = NULL; | |
477 | ||
478 | } while (sp->hdr.flags & RXRPC_JUMBO_PACKET); | |
479 | ||
480 | rxrpc_fast_process_packet(call, jumbo); | |
481 | _leave(""); | |
482 | return; | |
483 | ||
484 | protocol_error: | |
485 | _debug("protocol error"); | |
486 | rxrpc_free_skb(part); | |
487 | rxrpc_free_skb(jumbo); | |
488 | write_lock_bh(&call->state_lock); | |
489 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
490 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
dc44b3a0 | 491 | call->local_abort = RX_PROTOCOL_ERROR; |
4c198ad1 | 492 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
651350d1 | 493 | rxrpc_queue_call(call); |
17926a79 DH |
494 | } |
495 | write_unlock_bh(&call->state_lock); | |
496 | _leave(""); | |
497 | } | |
498 | ||
499 | /* | |
500 | * post an incoming packet to the appropriate call/socket to deal with | |
501 | * - must get rid of the sk_buff, either by freeing it or by queuing it | |
502 | */ | |
7727640c | 503 | static void rxrpc_post_packet_to_call(struct rxrpc_call *call, |
17926a79 DH |
504 | struct sk_buff *skb) |
505 | { | |
506 | struct rxrpc_skb_priv *sp; | |
17926a79 | 507 | |
7727640c | 508 | _enter("%p,%p", call, skb); |
17926a79 DH |
509 | |
510 | sp = rxrpc_skb(skb); | |
511 | ||
17926a79 | 512 | _debug("extant call [%d]", call->state); |
17926a79 DH |
513 | |
514 | read_lock(&call->state_lock); | |
515 | switch (call->state) { | |
516 | case RXRPC_CALL_LOCALLY_ABORTED: | |
4c198ad1 | 517 | if (!test_and_set_bit(RXRPC_CALL_EV_ABORT, &call->events)) { |
651350d1 | 518 | rxrpc_queue_call(call); |
7727640c TS |
519 | goto free_unlock; |
520 | } | |
17926a79 DH |
521 | case RXRPC_CALL_REMOTELY_ABORTED: |
522 | case RXRPC_CALL_NETWORK_ERROR: | |
523 | case RXRPC_CALL_DEAD: | |
7727640c TS |
524 | goto dead_call; |
525 | case RXRPC_CALL_COMPLETE: | |
526 | case RXRPC_CALL_CLIENT_FINAL_ACK: | |
527 | /* complete server call */ | |
19ffa01c | 528 | if (rxrpc_conn_is_service(call->conn)) |
7727640c TS |
529 | goto dead_call; |
530 | /* resend last packet of a completed call */ | |
531 | _debug("final ack again"); | |
532 | rxrpc_get_call(call); | |
4c198ad1 | 533 | set_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events); |
7727640c | 534 | rxrpc_queue_call(call); |
17926a79 DH |
535 | goto free_unlock; |
536 | default: | |
537 | break; | |
538 | } | |
539 | ||
540 | read_unlock(&call->state_lock); | |
541 | rxrpc_get_call(call); | |
17926a79 DH |
542 | |
543 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && | |
544 | sp->hdr.flags & RXRPC_JUMBO_PACKET) | |
545 | rxrpc_process_jumbo_packet(call, skb); | |
546 | else | |
547 | rxrpc_fast_process_packet(call, skb); | |
548 | ||
549 | rxrpc_put_call(call); | |
550 | goto done; | |
551 | ||
17926a79 | 552 | dead_call: |
b6f3a40c TS |
553 | if (sp->hdr.type != RXRPC_PACKET_TYPE_ABORT) { |
554 | skb->priority = RX_CALL_DEAD; | |
85f32278 | 555 | rxrpc_reject_packet(call->conn->params.local, skb); |
7727640c | 556 | goto unlock; |
17926a79 | 557 | } |
17926a79 | 558 | free_unlock: |
17926a79 | 559 | rxrpc_free_skb(skb); |
7727640c TS |
560 | unlock: |
561 | read_unlock(&call->state_lock); | |
17926a79 DH |
562 | done: |
563 | _leave(""); | |
564 | } | |
565 | ||
566 | /* | |
567 | * post connection-level events to the connection | |
568 | * - this includes challenges, responses and some aborts | |
569 | */ | |
8496af50 | 570 | static bool rxrpc_post_packet_to_conn(struct rxrpc_connection *conn, |
17926a79 DH |
571 | struct sk_buff *skb) |
572 | { | |
573 | _enter("%p,%p", conn, skb); | |
574 | ||
17926a79 | 575 | skb_queue_tail(&conn->rx_queue, skb); |
8496af50 | 576 | return rxrpc_queue_conn(conn); |
17926a79 DH |
577 | } |
578 | ||
44ba0698 DH |
579 | /* |
580 | * post endpoint-level events to the local endpoint | |
581 | * - this includes debug and version messages | |
582 | */ | |
583 | static void rxrpc_post_packet_to_local(struct rxrpc_local *local, | |
584 | struct sk_buff *skb) | |
585 | { | |
586 | _enter("%p,%p", local, skb); | |
587 | ||
44ba0698 | 588 | skb_queue_tail(&local->event_queue, skb); |
5acbee46 | 589 | rxrpc_queue_local(local); |
44ba0698 DH |
590 | } |
591 | ||
0d12f8a4 DH |
592 | /* |
593 | * Extract the wire header from a packet and translate the byte order. | |
594 | */ | |
595 | static noinline | |
596 | int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb) | |
597 | { | |
598 | struct rxrpc_wire_header whdr; | |
599 | ||
600 | /* dig out the RxRPC connection details */ | |
4d0fc73e | 601 | if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0) |
0d12f8a4 | 602 | return -EBADMSG; |
4d0fc73e | 603 | if (!pskb_pull(skb, sizeof(whdr))) |
0d12f8a4 DH |
604 | BUG(); |
605 | ||
606 | memset(sp, 0, sizeof(*sp)); | |
607 | sp->hdr.epoch = ntohl(whdr.epoch); | |
608 | sp->hdr.cid = ntohl(whdr.cid); | |
609 | sp->hdr.callNumber = ntohl(whdr.callNumber); | |
610 | sp->hdr.seq = ntohl(whdr.seq); | |
611 | sp->hdr.serial = ntohl(whdr.serial); | |
612 | sp->hdr.flags = whdr.flags; | |
613 | sp->hdr.type = whdr.type; | |
614 | sp->hdr.userStatus = whdr.userStatus; | |
615 | sp->hdr.securityIndex = whdr.securityIndex; | |
616 | sp->hdr._rsvd = ntohs(whdr._rsvd); | |
617 | sp->hdr.serviceId = ntohs(whdr.serviceId); | |
618 | return 0; | |
619 | } | |
620 | ||
17926a79 DH |
621 | /* |
622 | * handle data received on the local endpoint | |
623 | * - may be called in interrupt context | |
4f95dd78 DH |
624 | * |
625 | * The socket is locked by the caller and this prevents the socket from being | |
626 | * shut down and the local endpoint from going away, thus sk_user_data will not | |
627 | * be cleared until this function returns. | |
17926a79 | 628 | */ |
676d2369 | 629 | void rxrpc_data_ready(struct sock *sk) |
17926a79 | 630 | { |
8496af50 | 631 | struct rxrpc_connection *conn; |
17926a79 | 632 | struct rxrpc_skb_priv *sp; |
4f95dd78 | 633 | struct rxrpc_local *local = sk->sk_user_data; |
17926a79 DH |
634 | struct sk_buff *skb; |
635 | int ret; | |
636 | ||
676d2369 | 637 | _enter("%p", sk); |
17926a79 DH |
638 | |
639 | ASSERT(!irqs_disabled()); | |
640 | ||
17926a79 DH |
641 | skb = skb_recv_datagram(sk, 0, 1, &ret); |
642 | if (!skb) { | |
17926a79 DH |
643 | if (ret == -EAGAIN) |
644 | return; | |
645 | _debug("UDP socket error %d", ret); | |
646 | return; | |
647 | } | |
648 | ||
649 | rxrpc_new_skb(skb); | |
650 | ||
651 | _net("recv skb %p", skb); | |
652 | ||
653 | /* we'll probably need to checksum it (didn't call sock_recvmsg) */ | |
654 | if (skb_checksum_complete(skb)) { | |
655 | rxrpc_free_skb(skb); | |
02c22347 | 656 | __UDP_INC_STATS(&init_net, UDP_MIB_INERRORS, 0); |
17926a79 DH |
657 | _leave(" [CSUM failed]"); |
658 | return; | |
659 | } | |
660 | ||
02c22347 | 661 | __UDP_INC_STATS(&init_net, UDP_MIB_INDATAGRAMS, 0); |
1781f7f5 | 662 | |
0d12f8a4 DH |
663 | /* The socket buffer we have is owned by UDP, with UDP's data all over |
664 | * it, but we really want our own data there. | |
665 | */ | |
17926a79 DH |
666 | skb_orphan(skb); |
667 | sp = rxrpc_skb(skb); | |
17926a79 DH |
668 | |
669 | _net("Rx UDP packet from %08x:%04hu", | |
670 | ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source)); | |
671 | ||
672 | /* dig out the RxRPC connection details */ | |
0d12f8a4 | 673 | if (rxrpc_extract_header(sp, skb) < 0) |
17926a79 | 674 | goto bad_message; |
17926a79 DH |
675 | |
676 | _net("Rx RxRPC %s ep=%x call=%x:%x", | |
677 | sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient", | |
0d12f8a4 | 678 | sp->hdr.epoch, sp->hdr.cid, sp->hdr.callNumber); |
17926a79 | 679 | |
351c1e64 DH |
680 | if (sp->hdr.type >= RXRPC_N_PACKET_TYPES || |
681 | !((RXRPC_SUPPORTED_PACKET_TYPES >> sp->hdr.type) & 1)) { | |
17926a79 DH |
682 | _proto("Rx Bad Packet Type %u", sp->hdr.type); |
683 | goto bad_message; | |
684 | } | |
685 | ||
44ba0698 DH |
686 | if (sp->hdr.type == RXRPC_PACKET_TYPE_VERSION) { |
687 | rxrpc_post_packet_to_local(local, skb); | |
688 | goto out; | |
689 | } | |
bc6e1ea3 | 690 | |
17926a79 DH |
691 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && |
692 | (sp->hdr.callNumber == 0 || sp->hdr.seq == 0)) | |
693 | goto bad_message; | |
694 | ||
8496af50 DH |
695 | rcu_read_lock(); |
696 | ||
697 | retry_find_conn: | |
698 | conn = rxrpc_find_connection_rcu(local, skb); | |
699 | if (!conn) | |
700 | goto cant_route_call; | |
17926a79 | 701 | |
8496af50 DH |
702 | if (sp->hdr.callNumber == 0) { |
703 | /* Connection-level packet */ | |
7727640c | 704 | _debug("CONN %p {%d}", conn, conn->debug_id); |
8496af50 DH |
705 | if (!rxrpc_post_packet_to_conn(conn, skb)) |
706 | goto retry_find_conn; | |
7727640c | 707 | } else { |
8496af50 DH |
708 | /* Call-bound packets are routed by connection channel. */ |
709 | unsigned int channel = sp->hdr.cid & RXRPC_CHANNELMASK; | |
710 | struct rxrpc_channel *chan = &conn->channels[channel]; | |
711 | struct rxrpc_call *call = rcu_dereference(chan->call); | |
0d12f8a4 | 712 | |
8496af50 | 713 | if (!call || atomic_read(&call->usage) == 0) |
7727640c | 714 | goto cant_route_call; |
8496af50 DH |
715 | |
716 | rxrpc_post_packet_to_call(call, skb); | |
7727640c | 717 | } |
44ba0698 | 718 | |
8496af50 | 719 | rcu_read_unlock(); |
44ba0698 | 720 | out: |
17926a79 DH |
721 | return; |
722 | ||
723 | cant_route_call: | |
8496af50 DH |
724 | rcu_read_unlock(); |
725 | ||
17926a79 DH |
726 | _debug("can't route call"); |
727 | if (sp->hdr.flags & RXRPC_CLIENT_INITIATED && | |
728 | sp->hdr.type == RXRPC_PACKET_TYPE_DATA) { | |
0d12f8a4 | 729 | if (sp->hdr.seq == 1) { |
17926a79 DH |
730 | _debug("first packet"); |
731 | skb_queue_tail(&local->accept_queue, skb); | |
4f95dd78 | 732 | rxrpc_queue_work(&local->processor); |
17926a79 DH |
733 | _leave(" [incoming]"); |
734 | return; | |
735 | } | |
736 | skb->priority = RX_INVALID_OPERATION; | |
737 | } else { | |
738 | skb->priority = RX_CALL_DEAD; | |
739 | } | |
740 | ||
b6f3a40c TS |
741 | if (sp->hdr.type != RXRPC_PACKET_TYPE_ABORT) { |
742 | _debug("reject type %d",sp->hdr.type); | |
743 | rxrpc_reject_packet(local, skb); | |
744 | } | |
17926a79 DH |
745 | _leave(" [no call]"); |
746 | return; | |
747 | ||
748 | bad_message: | |
749 | skb->priority = RX_PROTOCOL_ERROR; | |
750 | rxrpc_reject_packet(local, skb); | |
17926a79 DH |
751 | _leave(" [badmsg]"); |
752 | } |