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; | |
50fd85a1 DH |
127 | u32 serial; |
128 | u8 flags; | |
17926a79 DH |
129 | |
130 | _enter("{%u,%u},,{%u}", call->rx_data_post, call->rx_first_oos, seq); | |
131 | ||
132 | sp = rxrpc_skb(skb); | |
133 | ASSERTCMP(sp->call, ==, NULL); | |
50fd85a1 DH |
134 | flags = sp->hdr.flags; |
135 | serial = sp->hdr.serial; | |
17926a79 DH |
136 | |
137 | spin_lock(&call->lock); | |
138 | ||
139 | if (call->state > RXRPC_CALL_COMPLETE) | |
140 | goto discard; | |
141 | ||
142 | ASSERTCMP(call->rx_data_expect, >=, call->rx_data_post); | |
143 | ASSERTCMP(call->rx_data_post, >=, call->rx_data_recv); | |
144 | ASSERTCMP(call->rx_data_recv, >=, call->rx_data_eaten); | |
145 | ||
146 | if (seq < call->rx_data_post) { | |
147 | _debug("dup #%u [-%u]", seq, call->rx_data_post); | |
148 | ack = RXRPC_ACK_DUPLICATE; | |
149 | ret = -ENOBUFS; | |
150 | goto discard_and_ack; | |
151 | } | |
152 | ||
153 | /* we may already have the packet in the out of sequence queue */ | |
154 | ackbit = seq - (call->rx_data_eaten + 1); | |
155 | ASSERTCMP(ackbit, >=, 0); | |
68c708fd | 156 | if (__test_and_set_bit(ackbit, call->ackr_window)) { |
17926a79 DH |
157 | _debug("dup oos #%u [%u,%u]", |
158 | seq, call->rx_data_eaten, call->rx_data_post); | |
159 | ack = RXRPC_ACK_DUPLICATE; | |
160 | goto discard_and_ack; | |
161 | } | |
162 | ||
163 | if (seq >= call->ackr_win_top) { | |
164 | _debug("exceed #%u [%u]", seq, call->ackr_win_top); | |
68c708fd | 165 | __clear_bit(ackbit, call->ackr_window); |
17926a79 DH |
166 | ack = RXRPC_ACK_EXCEEDS_WINDOW; |
167 | goto discard_and_ack; | |
168 | } | |
169 | ||
170 | if (seq == call->rx_data_expect) { | |
171 | clear_bit(RXRPC_CALL_EXPECT_OOS, &call->flags); | |
172 | call->rx_data_expect++; | |
173 | } else if (seq > call->rx_data_expect) { | |
174 | _debug("oos #%u [%u]", seq, call->rx_data_expect); | |
175 | call->rx_data_expect = seq + 1; | |
176 | if (test_and_set_bit(RXRPC_CALL_EXPECT_OOS, &call->flags)) { | |
177 | ack = RXRPC_ACK_OUT_OF_SEQUENCE; | |
178 | goto enqueue_and_ack; | |
179 | } | |
180 | goto enqueue_packet; | |
181 | } | |
182 | ||
183 | if (seq != call->rx_data_post) { | |
184 | _debug("ahead #%u [%u]", seq, call->rx_data_post); | |
185 | goto enqueue_packet; | |
186 | } | |
187 | ||
188 | if (test_bit(RXRPC_CALL_RCVD_LAST, &call->flags)) | |
189 | goto protocol_error; | |
190 | ||
191 | /* if the packet need security things doing to it, then it goes down | |
192 | * the slow path */ | |
e0e4d82f | 193 | if (call->conn->security_ix) |
17926a79 DH |
194 | goto enqueue_packet; |
195 | ||
196 | sp->call = call; | |
197 | rxrpc_get_call(call); | |
372ee163 | 198 | atomic_inc(&call->skb_count); |
50fd85a1 DH |
199 | terminal = ((flags & RXRPC_LAST_PACKET) && |
200 | !(flags & RXRPC_CLIENT_INITIATED)); | |
17926a79 DH |
201 | ret = rxrpc_queue_rcv_skb(call, skb, false, terminal); |
202 | if (ret < 0) { | |
203 | if (ret == -ENOMEM || ret == -ENOBUFS) { | |
68c708fd | 204 | __clear_bit(ackbit, call->ackr_window); |
17926a79 DH |
205 | ack = RXRPC_ACK_NOSPACE; |
206 | goto discard_and_ack; | |
207 | } | |
208 | goto out; | |
209 | } | |
210 | ||
211 | skb = NULL; | |
50fd85a1 | 212 | sp = NULL; |
17926a79 DH |
213 | |
214 | _debug("post #%u", seq); | |
215 | ASSERTCMP(call->rx_data_post, ==, seq); | |
216 | call->rx_data_post++; | |
217 | ||
50fd85a1 | 218 | if (flags & RXRPC_LAST_PACKET) |
17926a79 DH |
219 | set_bit(RXRPC_CALL_RCVD_LAST, &call->flags); |
220 | ||
221 | /* if we've reached an out of sequence packet then we need to drain | |
222 | * that queue into the socket Rx queue now */ | |
223 | if (call->rx_data_post == call->rx_first_oos) { | |
224 | _debug("drain rx oos now"); | |
225 | read_lock(&call->state_lock); | |
226 | if (call->state < RXRPC_CALL_COMPLETE && | |
4c198ad1 | 227 | !test_and_set_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events)) |
651350d1 | 228 | rxrpc_queue_call(call); |
17926a79 DH |
229 | read_unlock(&call->state_lock); |
230 | } | |
231 | ||
232 | spin_unlock(&call->lock); | |
233 | atomic_inc(&call->ackr_not_idle); | |
50fd85a1 | 234 | rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, serial, false); |
17926a79 DH |
235 | _leave(" = 0 [posted]"); |
236 | return 0; | |
237 | ||
238 | protocol_error: | |
239 | ret = -EBADMSG; | |
240 | out: | |
241 | spin_unlock(&call->lock); | |
242 | _leave(" = %d", ret); | |
243 | return ret; | |
244 | ||
245 | discard_and_ack: | |
246 | _debug("discard and ACK packet %p", skb); | |
50fd85a1 | 247 | __rxrpc_propose_ACK(call, ack, serial, true); |
17926a79 DH |
248 | discard: |
249 | spin_unlock(&call->lock); | |
250 | rxrpc_free_skb(skb); | |
251 | _leave(" = 0 [discarded]"); | |
252 | return 0; | |
253 | ||
254 | enqueue_and_ack: | |
50fd85a1 | 255 | __rxrpc_propose_ACK(call, ack, serial, true); |
17926a79 DH |
256 | enqueue_packet: |
257 | _net("defer skb %p", skb); | |
258 | spin_unlock(&call->lock); | |
259 | skb_queue_tail(&call->rx_queue, skb); | |
260 | atomic_inc(&call->ackr_not_idle); | |
261 | read_lock(&call->state_lock); | |
262 | if (call->state < RXRPC_CALL_DEAD) | |
651350d1 | 263 | rxrpc_queue_call(call); |
17926a79 DH |
264 | read_unlock(&call->state_lock); |
265 | _leave(" = 0 [queued]"); | |
266 | return 0; | |
267 | } | |
268 | ||
269 | /* | |
270 | * assume an implicit ACKALL of the transmission phase of a client socket upon | |
271 | * reception of the first reply packet | |
272 | */ | |
273 | static void rxrpc_assume_implicit_ackall(struct rxrpc_call *call, u32 serial) | |
274 | { | |
275 | write_lock_bh(&call->state_lock); | |
276 | ||
277 | switch (call->state) { | |
278 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
279 | call->state = RXRPC_CALL_CLIENT_RECV_REPLY; | |
280 | call->acks_latest = serial; | |
281 | ||
282 | _debug("implicit ACKALL %%%u", call->acks_latest); | |
4c198ad1 | 283 | set_bit(RXRPC_CALL_EV_RCVD_ACKALL, &call->events); |
17926a79 DH |
284 | write_unlock_bh(&call->state_lock); |
285 | ||
286 | if (try_to_del_timer_sync(&call->resend_timer) >= 0) { | |
4c198ad1 DH |
287 | clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events); |
288 | clear_bit(RXRPC_CALL_EV_RESEND, &call->events); | |
17926a79 DH |
289 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); |
290 | } | |
291 | break; | |
292 | ||
293 | default: | |
294 | write_unlock_bh(&call->state_lock); | |
295 | break; | |
296 | } | |
297 | } | |
298 | ||
299 | /* | |
300 | * post an incoming packet to the nominated call to deal with | |
301 | * - must get rid of the sk_buff, either by freeing it or by queuing it | |
302 | */ | |
303 | void rxrpc_fast_process_packet(struct rxrpc_call *call, struct sk_buff *skb) | |
304 | { | |
305 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
0d12f8a4 DH |
306 | __be32 wtmp; |
307 | u32 hi_serial, abort_code; | |
17926a79 DH |
308 | |
309 | _enter("%p,%p", call, skb); | |
310 | ||
311 | ASSERT(!irqs_disabled()); | |
312 | ||
313 | #if 0 // INJECT RX ERROR | |
314 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) { | |
315 | static int skip = 0; | |
316 | if (++skip == 3) { | |
317 | printk("DROPPED 3RD PACKET!!!!!!!!!!!!!\n"); | |
318 | skip = 0; | |
319 | goto free_packet; | |
320 | } | |
321 | } | |
322 | #endif | |
323 | ||
324 | /* track the latest serial number on this connection for ACK packet | |
325 | * information */ | |
17926a79 | 326 | hi_serial = atomic_read(&call->conn->hi_serial); |
0d12f8a4 | 327 | while (sp->hdr.serial > hi_serial) |
17926a79 | 328 | hi_serial = atomic_cmpxchg(&call->conn->hi_serial, hi_serial, |
0d12f8a4 | 329 | sp->hdr.serial); |
17926a79 DH |
330 | |
331 | /* request ACK generation for any ACK or DATA packet that requests | |
332 | * it */ | |
333 | if (sp->hdr.flags & RXRPC_REQUEST_ACK) { | |
0d12f8a4 | 334 | _proto("ACK Requested on %%%u", sp->hdr.serial); |
9823f39a | 335 | rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, sp->hdr.serial, false); |
17926a79 DH |
336 | } |
337 | ||
338 | switch (sp->hdr.type) { | |
339 | case RXRPC_PACKET_TYPE_ABORT: | |
340 | _debug("abort"); | |
341 | ||
0d12f8a4 | 342 | if (skb_copy_bits(skb, 0, &wtmp, sizeof(wtmp)) < 0) |
17926a79 DH |
343 | goto protocol_error; |
344 | ||
0d12f8a4 DH |
345 | abort_code = ntohl(wtmp); |
346 | _proto("Rx ABORT %%%u { %x }", sp->hdr.serial, abort_code); | |
17926a79 DH |
347 | |
348 | write_lock_bh(&call->state_lock); | |
349 | if (call->state < RXRPC_CALL_COMPLETE) { | |
350 | call->state = RXRPC_CALL_REMOTELY_ABORTED; | |
dc44b3a0 | 351 | call->remote_abort = abort_code; |
4c198ad1 | 352 | set_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events); |
651350d1 | 353 | rxrpc_queue_call(call); |
17926a79 DH |
354 | } |
355 | goto free_packet_unlock; | |
356 | ||
357 | case RXRPC_PACKET_TYPE_BUSY: | |
0d12f8a4 | 358 | _proto("Rx BUSY %%%u", sp->hdr.serial); |
17926a79 | 359 | |
19ffa01c | 360 | if (rxrpc_conn_is_service(call->conn)) |
17926a79 DH |
361 | goto protocol_error; |
362 | ||
363 | write_lock_bh(&call->state_lock); | |
364 | switch (call->state) { | |
365 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
366 | call->state = RXRPC_CALL_SERVER_BUSY; | |
4c198ad1 | 367 | set_bit(RXRPC_CALL_EV_RCVD_BUSY, &call->events); |
651350d1 | 368 | rxrpc_queue_call(call); |
17926a79 DH |
369 | case RXRPC_CALL_SERVER_BUSY: |
370 | goto free_packet_unlock; | |
371 | default: | |
372 | goto protocol_error_locked; | |
373 | } | |
374 | ||
375 | default: | |
0d12f8a4 | 376 | _proto("Rx %s %%%u", rxrpc_pkts[sp->hdr.type], sp->hdr.serial); |
17926a79 DH |
377 | goto protocol_error; |
378 | ||
379 | case RXRPC_PACKET_TYPE_DATA: | |
0d12f8a4 | 380 | _proto("Rx DATA %%%u { #%u }", sp->hdr.serial, sp->hdr.seq); |
17926a79 | 381 | |
0d12f8a4 | 382 | if (sp->hdr.seq == 0) |
17926a79 DH |
383 | goto protocol_error; |
384 | ||
385 | call->ackr_prev_seq = sp->hdr.seq; | |
386 | ||
387 | /* received data implicitly ACKs all of the request packets we | |
388 | * sent when we're acting as a client */ | |
389 | if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY) | |
0d12f8a4 | 390 | rxrpc_assume_implicit_ackall(call, sp->hdr.serial); |
17926a79 | 391 | |
0d12f8a4 | 392 | switch (rxrpc_fast_process_data(call, skb, sp->hdr.seq)) { |
17926a79 DH |
393 | case 0: |
394 | skb = NULL; | |
395 | goto done; | |
396 | ||
397 | default: | |
398 | BUG(); | |
399 | ||
400 | /* data packet received beyond the last packet */ | |
401 | case -EBADMSG: | |
402 | goto protocol_error; | |
403 | } | |
404 | ||
10003453 | 405 | case RXRPC_PACKET_TYPE_ACKALL: |
17926a79 DH |
406 | case RXRPC_PACKET_TYPE_ACK: |
407 | /* ACK processing is done in process context */ | |
408 | read_lock_bh(&call->state_lock); | |
409 | if (call->state < RXRPC_CALL_DEAD) { | |
410 | skb_queue_tail(&call->rx_queue, skb); | |
651350d1 | 411 | rxrpc_queue_call(call); |
17926a79 DH |
412 | skb = NULL; |
413 | } | |
414 | read_unlock_bh(&call->state_lock); | |
415 | goto free_packet; | |
416 | } | |
417 | ||
418 | protocol_error: | |
419 | _debug("protocol error"); | |
420 | write_lock_bh(&call->state_lock); | |
421 | protocol_error_locked: | |
422 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
423 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
dc44b3a0 | 424 | call->local_abort = RX_PROTOCOL_ERROR; |
4c198ad1 | 425 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
651350d1 | 426 | rxrpc_queue_call(call); |
17926a79 DH |
427 | } |
428 | free_packet_unlock: | |
429 | write_unlock_bh(&call->state_lock); | |
430 | free_packet: | |
431 | rxrpc_free_skb(skb); | |
432 | done: | |
433 | _leave(""); | |
434 | } | |
435 | ||
436 | /* | |
437 | * split up a jumbo data packet | |
438 | */ | |
439 | static void rxrpc_process_jumbo_packet(struct rxrpc_call *call, | |
440 | struct sk_buff *jumbo) | |
441 | { | |
442 | struct rxrpc_jumbo_header jhdr; | |
443 | struct rxrpc_skb_priv *sp; | |
444 | struct sk_buff *part; | |
445 | ||
446 | _enter(",{%u,%u}", jumbo->data_len, jumbo->len); | |
447 | ||
448 | sp = rxrpc_skb(jumbo); | |
449 | ||
450 | do { | |
451 | sp->hdr.flags &= ~RXRPC_JUMBO_PACKET; | |
452 | ||
453 | /* make a clone to represent the first subpacket in what's left | |
454 | * of the jumbo packet */ | |
455 | part = skb_clone(jumbo, GFP_ATOMIC); | |
456 | if (!part) { | |
457 | /* simply ditch the tail in the event of ENOMEM */ | |
458 | pskb_trim(jumbo, RXRPC_JUMBO_DATALEN); | |
459 | break; | |
460 | } | |
461 | rxrpc_new_skb(part); | |
462 | ||
463 | pskb_trim(part, RXRPC_JUMBO_DATALEN); | |
464 | ||
465 | if (!pskb_pull(jumbo, RXRPC_JUMBO_DATALEN)) | |
466 | goto protocol_error; | |
467 | ||
468 | if (skb_copy_bits(jumbo, 0, &jhdr, sizeof(jhdr)) < 0) | |
469 | goto protocol_error; | |
470 | if (!pskb_pull(jumbo, sizeof(jhdr))) | |
471 | BUG(); | |
472 | ||
0d12f8a4 DH |
473 | sp->hdr.seq += 1; |
474 | sp->hdr.serial += 1; | |
17926a79 | 475 | sp->hdr.flags = jhdr.flags; |
ac5d2683 | 476 | sp->hdr._rsvd = ntohs(jhdr._rsvd); |
17926a79 | 477 | |
0d12f8a4 | 478 | _proto("Rx DATA Jumbo %%%u", sp->hdr.serial - 1); |
17926a79 DH |
479 | |
480 | rxrpc_fast_process_packet(call, part); | |
481 | part = NULL; | |
482 | ||
483 | } while (sp->hdr.flags & RXRPC_JUMBO_PACKET); | |
484 | ||
485 | rxrpc_fast_process_packet(call, jumbo); | |
486 | _leave(""); | |
487 | return; | |
488 | ||
489 | protocol_error: | |
490 | _debug("protocol error"); | |
491 | rxrpc_free_skb(part); | |
492 | rxrpc_free_skb(jumbo); | |
493 | write_lock_bh(&call->state_lock); | |
494 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
495 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
dc44b3a0 | 496 | call->local_abort = RX_PROTOCOL_ERROR; |
4c198ad1 | 497 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
651350d1 | 498 | rxrpc_queue_call(call); |
17926a79 DH |
499 | } |
500 | write_unlock_bh(&call->state_lock); | |
501 | _leave(""); | |
502 | } | |
503 | ||
504 | /* | |
505 | * post an incoming packet to the appropriate call/socket to deal with | |
506 | * - must get rid of the sk_buff, either by freeing it or by queuing it | |
507 | */ | |
7727640c | 508 | static void rxrpc_post_packet_to_call(struct rxrpc_call *call, |
17926a79 DH |
509 | struct sk_buff *skb) |
510 | { | |
511 | struct rxrpc_skb_priv *sp; | |
17926a79 | 512 | |
7727640c | 513 | _enter("%p,%p", call, skb); |
17926a79 DH |
514 | |
515 | sp = rxrpc_skb(skb); | |
516 | ||
17926a79 | 517 | _debug("extant call [%d]", call->state); |
17926a79 DH |
518 | |
519 | read_lock(&call->state_lock); | |
520 | switch (call->state) { | |
521 | case RXRPC_CALL_LOCALLY_ABORTED: | |
4c198ad1 | 522 | if (!test_and_set_bit(RXRPC_CALL_EV_ABORT, &call->events)) { |
651350d1 | 523 | rxrpc_queue_call(call); |
7727640c TS |
524 | goto free_unlock; |
525 | } | |
17926a79 DH |
526 | case RXRPC_CALL_REMOTELY_ABORTED: |
527 | case RXRPC_CALL_NETWORK_ERROR: | |
528 | case RXRPC_CALL_DEAD: | |
7727640c TS |
529 | goto dead_call; |
530 | case RXRPC_CALL_COMPLETE: | |
531 | case RXRPC_CALL_CLIENT_FINAL_ACK: | |
532 | /* complete server call */ | |
19ffa01c | 533 | if (rxrpc_conn_is_service(call->conn)) |
7727640c TS |
534 | goto dead_call; |
535 | /* resend last packet of a completed call */ | |
536 | _debug("final ack again"); | |
537 | rxrpc_get_call(call); | |
4c198ad1 | 538 | set_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events); |
7727640c | 539 | rxrpc_queue_call(call); |
17926a79 DH |
540 | goto free_unlock; |
541 | default: | |
542 | break; | |
543 | } | |
544 | ||
545 | read_unlock(&call->state_lock); | |
546 | rxrpc_get_call(call); | |
17926a79 DH |
547 | |
548 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && | |
549 | sp->hdr.flags & RXRPC_JUMBO_PACKET) | |
550 | rxrpc_process_jumbo_packet(call, skb); | |
551 | else | |
552 | rxrpc_fast_process_packet(call, skb); | |
553 | ||
554 | rxrpc_put_call(call); | |
555 | goto done; | |
556 | ||
17926a79 | 557 | dead_call: |
b6f3a40c TS |
558 | if (sp->hdr.type != RXRPC_PACKET_TYPE_ABORT) { |
559 | skb->priority = RX_CALL_DEAD; | |
85f32278 | 560 | rxrpc_reject_packet(call->conn->params.local, skb); |
7727640c | 561 | goto unlock; |
17926a79 | 562 | } |
17926a79 | 563 | free_unlock: |
17926a79 | 564 | rxrpc_free_skb(skb); |
7727640c TS |
565 | unlock: |
566 | read_unlock(&call->state_lock); | |
17926a79 DH |
567 | done: |
568 | _leave(""); | |
569 | } | |
570 | ||
571 | /* | |
572 | * post connection-level events to the connection | |
573 | * - this includes challenges, responses and some aborts | |
574 | */ | |
2e7e9758 | 575 | static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn, |
17926a79 DH |
576 | struct sk_buff *skb) |
577 | { | |
578 | _enter("%p,%p", conn, skb); | |
579 | ||
17926a79 | 580 | skb_queue_tail(&conn->rx_queue, skb); |
2e7e9758 | 581 | rxrpc_queue_conn(conn); |
17926a79 DH |
582 | } |
583 | ||
44ba0698 DH |
584 | /* |
585 | * post endpoint-level events to the local endpoint | |
586 | * - this includes debug and version messages | |
587 | */ | |
588 | static void rxrpc_post_packet_to_local(struct rxrpc_local *local, | |
589 | struct sk_buff *skb) | |
590 | { | |
591 | _enter("%p,%p", local, skb); | |
592 | ||
44ba0698 | 593 | skb_queue_tail(&local->event_queue, skb); |
5acbee46 | 594 | rxrpc_queue_local(local); |
44ba0698 DH |
595 | } |
596 | ||
0d12f8a4 DH |
597 | /* |
598 | * Extract the wire header from a packet and translate the byte order. | |
599 | */ | |
600 | static noinline | |
601 | int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb) | |
602 | { | |
603 | struct rxrpc_wire_header whdr; | |
604 | ||
605 | /* dig out the RxRPC connection details */ | |
4d0fc73e | 606 | if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0) |
0d12f8a4 | 607 | return -EBADMSG; |
4d0fc73e | 608 | if (!pskb_pull(skb, sizeof(whdr))) |
0d12f8a4 DH |
609 | BUG(); |
610 | ||
611 | memset(sp, 0, sizeof(*sp)); | |
612 | sp->hdr.epoch = ntohl(whdr.epoch); | |
613 | sp->hdr.cid = ntohl(whdr.cid); | |
614 | sp->hdr.callNumber = ntohl(whdr.callNumber); | |
615 | sp->hdr.seq = ntohl(whdr.seq); | |
616 | sp->hdr.serial = ntohl(whdr.serial); | |
617 | sp->hdr.flags = whdr.flags; | |
618 | sp->hdr.type = whdr.type; | |
619 | sp->hdr.userStatus = whdr.userStatus; | |
620 | sp->hdr.securityIndex = whdr.securityIndex; | |
621 | sp->hdr._rsvd = ntohs(whdr._rsvd); | |
622 | sp->hdr.serviceId = ntohs(whdr.serviceId); | |
623 | return 0; | |
624 | } | |
625 | ||
17926a79 DH |
626 | /* |
627 | * handle data received on the local endpoint | |
628 | * - may be called in interrupt context | |
4f95dd78 DH |
629 | * |
630 | * The socket is locked by the caller and this prevents the socket from being | |
631 | * shut down and the local endpoint from going away, thus sk_user_data will not | |
632 | * be cleared until this function returns. | |
17926a79 | 633 | */ |
676d2369 | 634 | void rxrpc_data_ready(struct sock *sk) |
17926a79 | 635 | { |
8496af50 | 636 | struct rxrpc_connection *conn; |
17926a79 | 637 | struct rxrpc_skb_priv *sp; |
4f95dd78 | 638 | struct rxrpc_local *local = sk->sk_user_data; |
17926a79 DH |
639 | struct sk_buff *skb; |
640 | int ret; | |
641 | ||
676d2369 | 642 | _enter("%p", sk); |
17926a79 DH |
643 | |
644 | ASSERT(!irqs_disabled()); | |
645 | ||
17926a79 DH |
646 | skb = skb_recv_datagram(sk, 0, 1, &ret); |
647 | if (!skb) { | |
17926a79 DH |
648 | if (ret == -EAGAIN) |
649 | return; | |
650 | _debug("UDP socket error %d", ret); | |
651 | return; | |
652 | } | |
653 | ||
654 | rxrpc_new_skb(skb); | |
655 | ||
656 | _net("recv skb %p", skb); | |
657 | ||
658 | /* we'll probably need to checksum it (didn't call sock_recvmsg) */ | |
659 | if (skb_checksum_complete(skb)) { | |
660 | rxrpc_free_skb(skb); | |
02c22347 | 661 | __UDP_INC_STATS(&init_net, UDP_MIB_INERRORS, 0); |
17926a79 DH |
662 | _leave(" [CSUM failed]"); |
663 | return; | |
664 | } | |
665 | ||
02c22347 | 666 | __UDP_INC_STATS(&init_net, UDP_MIB_INDATAGRAMS, 0); |
1781f7f5 | 667 | |
0d12f8a4 DH |
668 | /* The socket buffer we have is owned by UDP, with UDP's data all over |
669 | * it, but we really want our own data there. | |
670 | */ | |
17926a79 DH |
671 | skb_orphan(skb); |
672 | sp = rxrpc_skb(skb); | |
17926a79 DH |
673 | |
674 | _net("Rx UDP packet from %08x:%04hu", | |
675 | ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source)); | |
676 | ||
677 | /* dig out the RxRPC connection details */ | |
0d12f8a4 | 678 | if (rxrpc_extract_header(sp, skb) < 0) |
17926a79 | 679 | goto bad_message; |
17926a79 DH |
680 | |
681 | _net("Rx RxRPC %s ep=%x call=%x:%x", | |
682 | sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient", | |
0d12f8a4 | 683 | sp->hdr.epoch, sp->hdr.cid, sp->hdr.callNumber); |
17926a79 | 684 | |
351c1e64 DH |
685 | if (sp->hdr.type >= RXRPC_N_PACKET_TYPES || |
686 | !((RXRPC_SUPPORTED_PACKET_TYPES >> sp->hdr.type) & 1)) { | |
17926a79 DH |
687 | _proto("Rx Bad Packet Type %u", sp->hdr.type); |
688 | goto bad_message; | |
689 | } | |
690 | ||
44ba0698 DH |
691 | if (sp->hdr.type == RXRPC_PACKET_TYPE_VERSION) { |
692 | rxrpc_post_packet_to_local(local, skb); | |
693 | goto out; | |
694 | } | |
bc6e1ea3 | 695 | |
17926a79 DH |
696 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && |
697 | (sp->hdr.callNumber == 0 || sp->hdr.seq == 0)) | |
698 | goto bad_message; | |
699 | ||
8496af50 DH |
700 | rcu_read_lock(); |
701 | ||
8496af50 DH |
702 | conn = rxrpc_find_connection_rcu(local, skb); |
703 | if (!conn) | |
704 | goto cant_route_call; | |
17926a79 | 705 | |
8496af50 DH |
706 | if (sp->hdr.callNumber == 0) { |
707 | /* Connection-level packet */ | |
7727640c | 708 | _debug("CONN %p {%d}", conn, conn->debug_id); |
2e7e9758 | 709 | rxrpc_post_packet_to_conn(conn, skb); |
7727640c | 710 | } else { |
8496af50 DH |
711 | /* Call-bound packets are routed by connection channel. */ |
712 | unsigned int channel = sp->hdr.cid & RXRPC_CHANNELMASK; | |
713 | struct rxrpc_channel *chan = &conn->channels[channel]; | |
714 | struct rxrpc_call *call = rcu_dereference(chan->call); | |
0d12f8a4 | 715 | |
8496af50 | 716 | if (!call || atomic_read(&call->usage) == 0) |
7727640c | 717 | goto cant_route_call; |
8496af50 DH |
718 | |
719 | rxrpc_post_packet_to_call(call, skb); | |
7727640c | 720 | } |
44ba0698 | 721 | |
8496af50 | 722 | rcu_read_unlock(); |
44ba0698 | 723 | out: |
17926a79 DH |
724 | return; |
725 | ||
726 | cant_route_call: | |
8496af50 DH |
727 | rcu_read_unlock(); |
728 | ||
17926a79 DH |
729 | _debug("can't route call"); |
730 | if (sp->hdr.flags & RXRPC_CLIENT_INITIATED && | |
731 | sp->hdr.type == RXRPC_PACKET_TYPE_DATA) { | |
0d12f8a4 | 732 | if (sp->hdr.seq == 1) { |
17926a79 DH |
733 | _debug("first packet"); |
734 | skb_queue_tail(&local->accept_queue, skb); | |
4f95dd78 | 735 | rxrpc_queue_work(&local->processor); |
17926a79 DH |
736 | _leave(" [incoming]"); |
737 | return; | |
738 | } | |
739 | skb->priority = RX_INVALID_OPERATION; | |
740 | } else { | |
741 | skb->priority = RX_CALL_DEAD; | |
742 | } | |
743 | ||
b6f3a40c TS |
744 | if (sp->hdr.type != RXRPC_PACKET_TYPE_ABORT) { |
745 | _debug("reject type %d",sp->hdr.type); | |
746 | rxrpc_reject_packet(local, skb); | |
992c273a DH |
747 | } else { |
748 | rxrpc_free_skb(skb); | |
b6f3a40c | 749 | } |
17926a79 DH |
750 | _leave(" [no call]"); |
751 | return; | |
752 | ||
753 | bad_message: | |
754 | skb->priority = RX_PROTOCOL_ERROR; | |
755 | rxrpc_reject_packet(local, skb); | |
17926a79 DH |
756 | _leave(" [badmsg]"); |
757 | } |