Commit | Line | Data |
---|---|---|
17926a79 DH |
1 | /* RxRPC packet reception |
2 | * | |
248f219c | 3 | * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved. |
17926a79 DH |
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 | ||
248f219c DH |
30 | static void rxrpc_proto_abort(const char *why, |
31 | struct rxrpc_call *call, rxrpc_seq_t seq) | |
32 | { | |
33 | if (rxrpc_abort_call(why, call, seq, RX_PROTOCOL_ERROR, EBADMSG)) { | |
34 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); | |
35 | rxrpc_queue_call(call); | |
36 | } | |
37 | } | |
38 | ||
8e83134d DH |
39 | /* |
40 | * Ping the other end to fill our RTT cache and to retrieve the rwind | |
41 | * and MTU parameters. | |
42 | */ | |
43 | static void rxrpc_send_ping(struct rxrpc_call *call, struct sk_buff *skb, | |
44 | int skew) | |
45 | { | |
46 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
fc943f67 | 47 | ktime_t now = skb->tstamp; |
8e83134d | 48 | |
fc943f67 DH |
49 | if (call->peer->rtt_usage < 3 || |
50 | ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000), now)) | |
51 | rxrpc_propose_ACK(call, RXRPC_ACK_PING, skew, sp->hdr.serial, | |
9c7ad434 DH |
52 | true, true, |
53 | rxrpc_propose_ack_ping_for_params); | |
8e83134d DH |
54 | } |
55 | ||
17926a79 | 56 | /* |
248f219c | 57 | * Apply a hard ACK by advancing the Tx window. |
17926a79 | 58 | */ |
248f219c | 59 | static void rxrpc_rotate_tx_window(struct rxrpc_call *call, rxrpc_seq_t to) |
17926a79 | 60 | { |
248f219c DH |
61 | struct sk_buff *skb, *list = NULL; |
62 | int ix; | |
70790dbe | 63 | u8 annotation; |
17926a79 | 64 | |
248f219c | 65 | spin_lock(&call->lock); |
17926a79 | 66 | |
248f219c DH |
67 | while (before(call->tx_hard_ack, to)) { |
68 | call->tx_hard_ack++; | |
69 | ix = call->tx_hard_ack & RXRPC_RXTX_BUFF_MASK; | |
70 | skb = call->rxtx_buffer[ix]; | |
70790dbe | 71 | annotation = call->rxtx_annotations[ix]; |
71f3ca40 | 72 | rxrpc_see_skb(skb, rxrpc_skb_tx_rotated); |
248f219c DH |
73 | call->rxtx_buffer[ix] = NULL; |
74 | call->rxtx_annotations[ix] = 0; | |
75 | skb->next = list; | |
76 | list = skb; | |
70790dbe DH |
77 | |
78 | if (annotation & RXRPC_TX_ANNO_LAST) | |
79 | set_bit(RXRPC_CALL_TX_LAST, &call->flags); | |
248f219c | 80 | } |
17926a79 | 81 | |
248f219c | 82 | spin_unlock(&call->lock); |
17926a79 | 83 | |
70790dbe DH |
84 | trace_rxrpc_transmit(call, (test_bit(RXRPC_CALL_TX_LAST, &call->flags) ? |
85 | rxrpc_transmit_rotate_last : | |
86 | rxrpc_transmit_rotate)); | |
bc4abfcf DH |
87 | wake_up(&call->waitq); |
88 | ||
248f219c DH |
89 | while (list) { |
90 | skb = list; | |
91 | list = skb->next; | |
92 | skb->next = NULL; | |
71f3ca40 | 93 | rxrpc_free_skb(skb, rxrpc_skb_tx_freed); |
17926a79 | 94 | } |
248f219c | 95 | } |
17926a79 | 96 | |
248f219c DH |
97 | /* |
98 | * End the transmission phase of a call. | |
99 | * | |
100 | * This occurs when we get an ACKALL packet, the first DATA packet of a reply, | |
101 | * or a final ACK packet. | |
102 | */ | |
70790dbe DH |
103 | static bool rxrpc_end_tx_phase(struct rxrpc_call *call, bool reply_begun, |
104 | const char *abort_why) | |
248f219c | 105 | { |
17926a79 | 106 | |
70790dbe | 107 | ASSERT(test_bit(RXRPC_CALL_TX_LAST, &call->flags)); |
17926a79 | 108 | |
248f219c | 109 | write_lock(&call->state_lock); |
651350d1 | 110 | |
248f219c | 111 | switch (call->state) { |
70790dbe | 112 | case RXRPC_CALL_CLIENT_SEND_REQUEST: |
248f219c | 113 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: |
70790dbe DH |
114 | if (reply_begun) |
115 | call->state = RXRPC_CALL_CLIENT_RECV_REPLY; | |
116 | else | |
117 | call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY; | |
248f219c | 118 | break; |
70790dbe | 119 | |
248f219c DH |
120 | case RXRPC_CALL_SERVER_AWAIT_ACK: |
121 | __rxrpc_call_completed(call); | |
122 | rxrpc_notify_socket(call); | |
123 | break; | |
70790dbe DH |
124 | |
125 | default: | |
126 | goto bad_state; | |
17926a79 | 127 | } |
17926a79 | 128 | |
248f219c | 129 | write_unlock(&call->state_lock); |
70790dbe DH |
130 | if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY) { |
131 | trace_rxrpc_transmit(call, rxrpc_transmit_await_reply); | |
132 | } else { | |
133 | trace_rxrpc_transmit(call, rxrpc_transmit_end); | |
134 | } | |
248f219c DH |
135 | _leave(" = ok"); |
136 | return true; | |
70790dbe DH |
137 | |
138 | bad_state: | |
139 | write_unlock(&call->state_lock); | |
140 | kdebug("end_tx %s", rxrpc_call_states[call->state]); | |
141 | rxrpc_proto_abort(abort_why, call, call->tx_top); | |
142 | return false; | |
143 | } | |
144 | ||
145 | /* | |
146 | * Begin the reply reception phase of a call. | |
147 | */ | |
148 | static bool rxrpc_receiving_reply(struct rxrpc_call *call) | |
149 | { | |
150 | rxrpc_seq_t top = READ_ONCE(call->tx_top); | |
151 | ||
dd7c1ee5 DH |
152 | if (call->ackr_reason) { |
153 | spin_lock_bh(&call->lock); | |
154 | call->ackr_reason = 0; | |
155 | call->resend_at = call->expire_at; | |
156 | call->ack_at = call->expire_at; | |
157 | spin_unlock_bh(&call->lock); | |
158 | rxrpc_set_timer(call, rxrpc_timer_init_for_reply); | |
159 | } | |
160 | ||
70790dbe DH |
161 | if (!test_bit(RXRPC_CALL_TX_LAST, &call->flags)) |
162 | rxrpc_rotate_tx_window(call, top); | |
163 | if (!test_bit(RXRPC_CALL_TX_LAST, &call->flags)) { | |
164 | rxrpc_proto_abort("TXL", call, top); | |
165 | return false; | |
166 | } | |
167 | if (!rxrpc_end_tx_phase(call, true, "ETD")) | |
168 | return false; | |
169 | call->tx_phase = false; | |
170 | return true; | |
248f219c DH |
171 | } |
172 | ||
173 | /* | |
174 | * Scan a jumbo packet to validate its structure and to work out how many | |
175 | * subpackets it contains. | |
176 | * | |
177 | * A jumbo packet is a collection of consecutive packets glued together with | |
178 | * little headers between that indicate how to change the initial header for | |
179 | * each subpacket. | |
180 | * | |
181 | * RXRPC_JUMBO_PACKET must be set on all but the last subpacket - and all but | |
182 | * the last are RXRPC_JUMBO_DATALEN in size. The last subpacket may be of any | |
183 | * size. | |
184 | */ | |
185 | static bool rxrpc_validate_jumbo(struct sk_buff *skb) | |
186 | { | |
187 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
188 | unsigned int offset = sp->offset; | |
89a80ed4 | 189 | unsigned int len = skb->len; |
248f219c DH |
190 | int nr_jumbo = 1; |
191 | u8 flags = sp->hdr.flags; | |
192 | ||
193 | do { | |
194 | nr_jumbo++; | |
195 | if (len - offset < RXRPC_JUMBO_SUBPKTLEN) | |
196 | goto protocol_error; | |
197 | if (flags & RXRPC_LAST_PACKET) | |
198 | goto protocol_error; | |
199 | offset += RXRPC_JUMBO_DATALEN; | |
200 | if (skb_copy_bits(skb, offset, &flags, 1) < 0) | |
201 | goto protocol_error; | |
202 | offset += sizeof(struct rxrpc_jumbo_header); | |
203 | } while (flags & RXRPC_JUMBO_PACKET); | |
204 | ||
205 | sp->nr_jumbo = nr_jumbo; | |
206 | return true; | |
17926a79 | 207 | |
248f219c DH |
208 | protocol_error: |
209 | return false; | |
17926a79 DH |
210 | } |
211 | ||
212 | /* | |
248f219c DH |
213 | * Handle reception of a duplicate packet. |
214 | * | |
215 | * We have to take care to avoid an attack here whereby we're given a series of | |
216 | * jumbograms, each with a sequence number one before the preceding one and | |
217 | * filled up to maximum UDP size. If they never send us the first packet in | |
218 | * the sequence, they can cause us to have to hold on to around 2MiB of kernel | |
219 | * space until the call times out. | |
220 | * | |
221 | * We limit the space usage by only accepting three duplicate jumbo packets per | |
222 | * call. After that, we tell the other side we're no longer accepting jumbos | |
223 | * (that information is encoded in the ACK packet). | |
17926a79 | 224 | */ |
248f219c | 225 | static void rxrpc_input_dup_data(struct rxrpc_call *call, rxrpc_seq_t seq, |
75e42126 | 226 | u8 annotation, bool *_jumbo_bad) |
17926a79 | 227 | { |
248f219c DH |
228 | /* Discard normal packets that are duplicates. */ |
229 | if (annotation == 0) | |
230 | return; | |
17926a79 | 231 | |
248f219c DH |
232 | /* Skip jumbo subpackets that are duplicates. When we've had three or |
233 | * more partially duplicate jumbo packets, we refuse to take any more | |
234 | * jumbos for this call. | |
235 | */ | |
75e42126 DH |
236 | if (!*_jumbo_bad) { |
237 | call->nr_jumbo_bad++; | |
238 | *_jumbo_bad = true; | |
248f219c DH |
239 | } |
240 | } | |
17926a79 | 241 | |
248f219c DH |
242 | /* |
243 | * Process a DATA packet, adding the packet to the Rx ring. | |
244 | */ | |
245 | static void rxrpc_input_data(struct rxrpc_call *call, struct sk_buff *skb, | |
246 | u16 skew) | |
247 | { | |
248 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
249 | unsigned int offset = sp->offset; | |
250 | unsigned int ix; | |
251 | rxrpc_serial_t serial = sp->hdr.serial, ack_serial = 0; | |
252 | rxrpc_seq_t seq = sp->hdr.seq, hard_ack; | |
75e42126 | 253 | bool immediate_ack = false, jumbo_bad = false, queued; |
248f219c DH |
254 | u16 len; |
255 | u8 ack = 0, flags, annotation = 0; | |
17926a79 | 256 | |
248f219c | 257 | _enter("{%u,%u},{%u,%u}", |
89a80ed4 | 258 | call->rx_hard_ack, call->rx_top, skb->len, seq); |
17926a79 | 259 | |
248f219c DH |
260 | _proto("Rx DATA %%%u { #%u f=%02x }", |
261 | sp->hdr.serial, seq, sp->hdr.flags); | |
17926a79 | 262 | |
248f219c DH |
263 | if (call->state >= RXRPC_CALL_COMPLETE) |
264 | return; | |
17926a79 | 265 | |
248f219c DH |
266 | /* Received data implicitly ACKs all of the request packets we sent |
267 | * when we're acting as a client. | |
268 | */ | |
70790dbe DH |
269 | if ((call->state == RXRPC_CALL_CLIENT_SEND_REQUEST || |
270 | call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY) && | |
271 | !rxrpc_receiving_reply(call)) | |
248f219c | 272 | return; |
17926a79 | 273 | |
248f219c | 274 | call->ackr_prev_seq = seq; |
17926a79 | 275 | |
248f219c DH |
276 | hard_ack = READ_ONCE(call->rx_hard_ack); |
277 | if (after(seq, hard_ack + call->rx_winsize)) { | |
17926a79 | 278 | ack = RXRPC_ACK_EXCEEDS_WINDOW; |
248f219c DH |
279 | ack_serial = serial; |
280 | goto ack; | |
17926a79 DH |
281 | } |
282 | ||
248f219c DH |
283 | flags = sp->hdr.flags; |
284 | if (flags & RXRPC_JUMBO_PACKET) { | |
75e42126 | 285 | if (call->nr_jumbo_bad > 3) { |
248f219c DH |
286 | ack = RXRPC_ACK_NOSPACE; |
287 | ack_serial = serial; | |
288 | goto ack; | |
17926a79 | 289 | } |
248f219c | 290 | annotation = 1; |
17926a79 DH |
291 | } |
292 | ||
248f219c DH |
293 | next_subpacket: |
294 | queued = false; | |
295 | ix = seq & RXRPC_RXTX_BUFF_MASK; | |
89a80ed4 | 296 | len = skb->len; |
248f219c DH |
297 | if (flags & RXRPC_JUMBO_PACKET) |
298 | len = RXRPC_JUMBO_DATALEN; | |
299 | ||
300 | if (flags & RXRPC_LAST_PACKET) { | |
816c9fce | 301 | if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) && |
248f219c DH |
302 | seq != call->rx_top) |
303 | return rxrpc_proto_abort("LSN", call, seq); | |
304 | } else { | |
305 | if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) && | |
306 | after_eq(seq, call->rx_top)) | |
307 | return rxrpc_proto_abort("LSA", call, seq); | |
17926a79 DH |
308 | } |
309 | ||
248f219c DH |
310 | if (before_eq(seq, hard_ack)) { |
311 | ack = RXRPC_ACK_DUPLICATE; | |
312 | ack_serial = serial; | |
313 | goto skip; | |
314 | } | |
315 | ||
316 | if (flags & RXRPC_REQUEST_ACK && !ack) { | |
317 | ack = RXRPC_ACK_REQUESTED; | |
318 | ack_serial = serial; | |
319 | } | |
320 | ||
321 | if (call->rxtx_buffer[ix]) { | |
75e42126 | 322 | rxrpc_input_dup_data(call, seq, annotation, &jumbo_bad); |
248f219c DH |
323 | if (ack != RXRPC_ACK_DUPLICATE) { |
324 | ack = RXRPC_ACK_DUPLICATE; | |
325 | ack_serial = serial; | |
17926a79 | 326 | } |
248f219c DH |
327 | immediate_ack = true; |
328 | goto skip; | |
17926a79 DH |
329 | } |
330 | ||
248f219c DH |
331 | /* Queue the packet. We use a couple of memory barriers here as need |
332 | * to make sure that rx_top is perceived to be set after the buffer | |
333 | * pointer and that the buffer pointer is set after the annotation and | |
334 | * the skb data. | |
335 | * | |
336 | * Barriers against rxrpc_recvmsg_data() and rxrpc_rotate_rx_window() | |
337 | * and also rxrpc_fill_out_ack(). | |
338 | */ | |
71f3ca40 | 339 | rxrpc_get_skb(skb, rxrpc_skb_rx_got); |
248f219c DH |
340 | call->rxtx_annotations[ix] = annotation; |
341 | smp_wmb(); | |
342 | call->rxtx_buffer[ix] = skb; | |
a7056c5b | 343 | if (after(seq, call->rx_top)) { |
248f219c | 344 | smp_store_release(&call->rx_top, seq); |
a7056c5b DH |
345 | } else if (before(seq, call->rx_top)) { |
346 | /* Send an immediate ACK if we fill in a hole */ | |
347 | if (!ack) { | |
348 | ack = RXRPC_ACK_DELAY; | |
349 | ack_serial = serial; | |
350 | } | |
351 | immediate_ack = true; | |
352 | } | |
58dc63c9 | 353 | if (flags & RXRPC_LAST_PACKET) { |
816c9fce | 354 | set_bit(RXRPC_CALL_RX_LAST, &call->flags); |
58dc63c9 DH |
355 | trace_rxrpc_receive(call, rxrpc_receive_queue_last, serial, seq); |
356 | } else { | |
357 | trace_rxrpc_receive(call, rxrpc_receive_queue, serial, seq); | |
358 | } | |
248f219c DH |
359 | queued = true; |
360 | ||
361 | if (after_eq(seq, call->rx_expect_next)) { | |
362 | if (after(seq, call->rx_expect_next)) { | |
363 | _net("OOS %u > %u", seq, call->rx_expect_next); | |
364 | ack = RXRPC_ACK_OUT_OF_SEQUENCE; | |
365 | ack_serial = serial; | |
366 | } | |
367 | call->rx_expect_next = seq + 1; | |
17926a79 DH |
368 | } |
369 | ||
248f219c DH |
370 | skip: |
371 | offset += len; | |
372 | if (flags & RXRPC_JUMBO_PACKET) { | |
373 | if (skb_copy_bits(skb, offset, &flags, 1) < 0) | |
374 | return rxrpc_proto_abort("XJF", call, seq); | |
375 | offset += sizeof(struct rxrpc_jumbo_header); | |
376 | seq++; | |
377 | serial++; | |
378 | annotation++; | |
379 | if (flags & RXRPC_JUMBO_PACKET) | |
380 | annotation |= RXRPC_RX_ANNO_JLAST; | |
75e42126 DH |
381 | if (after(seq, hard_ack + call->rx_winsize)) { |
382 | ack = RXRPC_ACK_EXCEEDS_WINDOW; | |
383 | ack_serial = serial; | |
384 | if (!jumbo_bad) { | |
385 | call->nr_jumbo_bad++; | |
386 | jumbo_bad = true; | |
387 | } | |
388 | goto ack; | |
389 | } | |
248f219c DH |
390 | |
391 | _proto("Rx DATA Jumbo %%%u", serial); | |
392 | goto next_subpacket; | |
393 | } | |
17926a79 | 394 | |
248f219c DH |
395 | if (queued && flags & RXRPC_LAST_PACKET && !ack) { |
396 | ack = RXRPC_ACK_DELAY; | |
397 | ack_serial = serial; | |
398 | } | |
17926a79 | 399 | |
248f219c DH |
400 | ack: |
401 | if (ack) | |
402 | rxrpc_propose_ACK(call, ack, skew, ack_serial, | |
9c7ad434 DH |
403 | immediate_ack, true, |
404 | rxrpc_propose_ack_input_data); | |
17926a79 | 405 | |
248f219c DH |
406 | if (sp->hdr.seq == READ_ONCE(call->rx_hard_ack) + 1) |
407 | rxrpc_notify_socket(call); | |
408 | _leave(" [queued]"); | |
17926a79 DH |
409 | } |
410 | ||
50235c4b DH |
411 | /* |
412 | * Process a requested ACK. | |
413 | */ | |
414 | static void rxrpc_input_requested_ack(struct rxrpc_call *call, | |
415 | ktime_t resp_time, | |
416 | rxrpc_serial_t orig_serial, | |
417 | rxrpc_serial_t ack_serial) | |
418 | { | |
419 | struct rxrpc_skb_priv *sp; | |
420 | struct sk_buff *skb; | |
421 | ktime_t sent_at; | |
422 | int ix; | |
423 | ||
424 | for (ix = 0; ix < RXRPC_RXTX_BUFF_SIZE; ix++) { | |
425 | skb = call->rxtx_buffer[ix]; | |
426 | if (!skb) | |
427 | continue; | |
428 | ||
429 | sp = rxrpc_skb(skb); | |
430 | if (sp->hdr.serial != orig_serial) | |
431 | continue; | |
432 | smp_rmb(); | |
433 | sent_at = skb->tstamp; | |
434 | goto found; | |
435 | } | |
436 | return; | |
437 | ||
438 | found: | |
439 | rxrpc_peer_add_rtt(call, rxrpc_rtt_rx_requested_ack, | |
440 | orig_serial, ack_serial, sent_at, resp_time); | |
441 | } | |
442 | ||
8e83134d DH |
443 | /* |
444 | * Process a ping response. | |
445 | */ | |
446 | static void rxrpc_input_ping_response(struct rxrpc_call *call, | |
447 | ktime_t resp_time, | |
448 | rxrpc_serial_t orig_serial, | |
449 | rxrpc_serial_t ack_serial) | |
450 | { | |
451 | rxrpc_serial_t ping_serial; | |
452 | ktime_t ping_time; | |
453 | ||
454 | ping_time = call->ackr_ping_time; | |
455 | smp_rmb(); | |
456 | ping_serial = call->ackr_ping; | |
457 | ||
458 | if (!test_bit(RXRPC_CALL_PINGING, &call->flags) || | |
459 | before(orig_serial, ping_serial)) | |
460 | return; | |
461 | clear_bit(RXRPC_CALL_PINGING, &call->flags); | |
462 | if (after(orig_serial, ping_serial)) | |
463 | return; | |
464 | ||
465 | rxrpc_peer_add_rtt(call, rxrpc_rtt_rx_ping_response, | |
466 | orig_serial, ack_serial, ping_time, resp_time); | |
467 | } | |
468 | ||
17926a79 | 469 | /* |
248f219c | 470 | * Process the extra information that may be appended to an ACK packet |
17926a79 | 471 | */ |
248f219c DH |
472 | static void rxrpc_input_ackinfo(struct rxrpc_call *call, struct sk_buff *skb, |
473 | struct rxrpc_ackinfo *ackinfo) | |
17926a79 | 474 | { |
248f219c DH |
475 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
476 | struct rxrpc_peer *peer; | |
477 | unsigned int mtu; | |
01fd0742 | 478 | u32 rwind = ntohl(ackinfo->rwind); |
248f219c DH |
479 | |
480 | _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }", | |
481 | sp->hdr.serial, | |
482 | ntohl(ackinfo->rxMTU), ntohl(ackinfo->maxMTU), | |
01fd0742 | 483 | rwind, ntohl(ackinfo->jumbo_max)); |
248f219c | 484 | |
01fd0742 DH |
485 | if (rwind > RXRPC_RXTX_BUFF_SIZE - 1) |
486 | rwind = RXRPC_RXTX_BUFF_SIZE - 1; | |
487 | call->tx_winsize = rwind; | |
248f219c DH |
488 | |
489 | mtu = min(ntohl(ackinfo->rxMTU), ntohl(ackinfo->maxMTU)); | |
490 | ||
491 | peer = call->peer; | |
492 | if (mtu < peer->maxdata) { | |
493 | spin_lock_bh(&peer->lock); | |
494 | peer->maxdata = mtu; | |
495 | peer->mtu = mtu + peer->hdrsize; | |
496 | spin_unlock_bh(&peer->lock); | |
497 | _net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata); | |
498 | } | |
499 | } | |
17926a79 | 500 | |
248f219c DH |
501 | /* |
502 | * Process individual soft ACKs. | |
503 | * | |
504 | * Each ACK in the array corresponds to one packet and can be either an ACK or | |
505 | * a NAK. If we get find an explicitly NAK'd packet we resend immediately; | |
506 | * packets that lie beyond the end of the ACK list are scheduled for resend by | |
507 | * the timer on the basis that the peer might just not have processed them at | |
508 | * the time the ACK was sent. | |
509 | */ | |
510 | static void rxrpc_input_soft_acks(struct rxrpc_call *call, u8 *acks, | |
511 | rxrpc_seq_t seq, int nr_acks) | |
512 | { | |
513 | bool resend = false; | |
514 | int ix; | |
f07373ea | 515 | u8 annotation, anno_type; |
248f219c DH |
516 | |
517 | for (; nr_acks > 0; nr_acks--, seq++) { | |
518 | ix = seq & RXRPC_RXTX_BUFF_MASK; | |
f07373ea DH |
519 | annotation = call->rxtx_annotations[ix]; |
520 | anno_type = annotation & RXRPC_TX_ANNO_MASK; | |
521 | annotation &= ~RXRPC_TX_ANNO_MASK; | |
d01dc4c3 | 522 | switch (*acks++) { |
248f219c | 523 | case RXRPC_ACK_TYPE_ACK: |
f07373ea DH |
524 | if (anno_type == RXRPC_TX_ANNO_ACK) |
525 | continue; | |
526 | call->rxtx_annotations[ix] = | |
527 | RXRPC_TX_ANNO_ACK | annotation; | |
248f219c DH |
528 | break; |
529 | case RXRPC_ACK_TYPE_NACK: | |
f07373ea | 530 | if (anno_type == RXRPC_TX_ANNO_NAK) |
248f219c | 531 | continue; |
be8aa338 DH |
532 | if (anno_type == RXRPC_TX_ANNO_RETRANS) |
533 | continue; | |
f07373ea DH |
534 | call->rxtx_annotations[ix] = |
535 | RXRPC_TX_ANNO_NAK | annotation; | |
248f219c DH |
536 | resend = true; |
537 | break; | |
538 | default: | |
539 | return rxrpc_proto_abort("SFT", call, 0); | |
17926a79 | 540 | } |
17926a79 | 541 | } |
248f219c DH |
542 | |
543 | if (resend && | |
544 | !test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) | |
545 | rxrpc_queue_call(call); | |
17926a79 DH |
546 | } |
547 | ||
548 | /* | |
248f219c DH |
549 | * Process an ACK packet. |
550 | * | |
551 | * ack.firstPacket is the sequence number of the first soft-ACK'd/NAK'd packet | |
552 | * in the ACK array. Anything before that is hard-ACK'd and may be discarded. | |
553 | * | |
554 | * A hard-ACK means that a packet has been processed and may be discarded; a | |
555 | * soft-ACK means that the packet may be discarded and retransmission | |
556 | * requested. A phase is complete when all packets are hard-ACK'd. | |
17926a79 | 557 | */ |
248f219c DH |
558 | static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb, |
559 | u16 skew) | |
17926a79 | 560 | { |
9c7ad434 | 561 | u8 ack_reason; |
17926a79 | 562 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
248f219c DH |
563 | union { |
564 | struct rxrpc_ackpacket ack; | |
565 | struct rxrpc_ackinfo info; | |
566 | u8 acks[RXRPC_MAXACKS]; | |
567 | } buf; | |
8e83134d | 568 | rxrpc_serial_t acked_serial; |
248f219c DH |
569 | rxrpc_seq_t first_soft_ack, hard_ack; |
570 | int nr_acks, offset; | |
571 | ||
572 | _enter(""); | |
573 | ||
574 | if (skb_copy_bits(skb, sp->offset, &buf.ack, sizeof(buf.ack)) < 0) { | |
575 | _debug("extraction failure"); | |
576 | return rxrpc_proto_abort("XAK", call, 0); | |
17926a79 | 577 | } |
248f219c DH |
578 | sp->offset += sizeof(buf.ack); |
579 | ||
8e83134d | 580 | acked_serial = ntohl(buf.ack.serial); |
248f219c DH |
581 | first_soft_ack = ntohl(buf.ack.firstPacket); |
582 | hard_ack = first_soft_ack - 1; | |
583 | nr_acks = buf.ack.nAcks; | |
9c7ad434 DH |
584 | ack_reason = (buf.ack.reason < RXRPC_ACK__INVALID ? |
585 | buf.ack.reason : RXRPC_ACK__INVALID); | |
248f219c | 586 | |
9c7ad434 | 587 | trace_rxrpc_rx_ack(call, first_soft_ack, ack_reason, nr_acks); |
ec71eb9a | 588 | |
248f219c DH |
589 | _proto("Rx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }", |
590 | sp->hdr.serial, | |
591 | ntohs(buf.ack.maxSkew), | |
592 | first_soft_ack, | |
593 | ntohl(buf.ack.previousPacket), | |
8e83134d | 594 | acked_serial, |
9c7ad434 | 595 | rxrpc_ack_names[ack_reason], |
248f219c DH |
596 | buf.ack.nAcks); |
597 | ||
8e83134d DH |
598 | if (buf.ack.reason == RXRPC_ACK_PING_RESPONSE) |
599 | rxrpc_input_ping_response(call, skb->tstamp, acked_serial, | |
600 | sp->hdr.serial); | |
50235c4b DH |
601 | if (buf.ack.reason == RXRPC_ACK_REQUESTED) |
602 | rxrpc_input_requested_ack(call, skb->tstamp, acked_serial, | |
603 | sp->hdr.serial); | |
8e83134d | 604 | |
248f219c DH |
605 | if (buf.ack.reason == RXRPC_ACK_PING) { |
606 | _proto("Rx ACK %%%u PING Request", sp->hdr.serial); | |
607 | rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE, | |
9c7ad434 DH |
608 | skew, sp->hdr.serial, true, true, |
609 | rxrpc_propose_ack_respond_to_ping); | |
248f219c | 610 | } else if (sp->hdr.flags & RXRPC_REQUEST_ACK) { |
563ea7d5 | 611 | rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, |
9c7ad434 DH |
612 | skew, sp->hdr.serial, true, true, |
613 | rxrpc_propose_ack_respond_to_ack); | |
17926a79 DH |
614 | } |
615 | ||
248f219c | 616 | offset = sp->offset + nr_acks + 3; |
89a80ed4 | 617 | if (skb->len >= offset + sizeof(buf.info)) { |
248f219c DH |
618 | if (skb_copy_bits(skb, offset, &buf.info, sizeof(buf.info)) < 0) |
619 | return rxrpc_proto_abort("XAI", call, 0); | |
620 | rxrpc_input_ackinfo(call, skb, &buf.info); | |
621 | } | |
17926a79 | 622 | |
248f219c DH |
623 | if (first_soft_ack == 0) |
624 | return rxrpc_proto_abort("AK0", call, 0); | |
17926a79 | 625 | |
248f219c DH |
626 | /* Ignore ACKs unless we are or have just been transmitting. */ |
627 | switch (call->state) { | |
628 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
629 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
630 | case RXRPC_CALL_SERVER_SEND_REPLY: | |
631 | case RXRPC_CALL_SERVER_AWAIT_ACK: | |
632 | break; | |
17926a79 | 633 | default: |
248f219c DH |
634 | return; |
635 | } | |
17926a79 | 636 | |
248f219c | 637 | /* Discard any out-of-order or duplicate ACKs. */ |
98dafac5 | 638 | if (before_eq(sp->hdr.serial, call->acks_latest)) { |
248f219c DH |
639 | _debug("discard ACK %d <= %d", |
640 | sp->hdr.serial, call->acks_latest); | |
641 | return; | |
642 | } | |
643 | call->acks_latest = sp->hdr.serial; | |
17926a79 | 644 | |
248f219c DH |
645 | if (before(hard_ack, call->tx_hard_ack) || |
646 | after(hard_ack, call->tx_top)) | |
647 | return rxrpc_proto_abort("AKW", call, 0); | |
70790dbe DH |
648 | if (nr_acks > call->tx_top - hard_ack) |
649 | return rxrpc_proto_abort("AKN", call, 0); | |
17926a79 | 650 | |
248f219c DH |
651 | if (after(hard_ack, call->tx_hard_ack)) |
652 | rxrpc_rotate_tx_window(call, hard_ack); | |
17926a79 | 653 | |
70790dbe DH |
654 | if (nr_acks > 0) { |
655 | if (skb_copy_bits(skb, sp->offset, buf.acks, nr_acks) < 0) | |
656 | return rxrpc_proto_abort("XSA", call, 0); | |
657 | rxrpc_input_soft_acks(call, buf.acks, first_soft_ack, nr_acks); | |
658 | } | |
659 | ||
660 | if (test_bit(RXRPC_CALL_TX_LAST, &call->flags)) { | |
661 | rxrpc_end_tx_phase(call, false, "ETA"); | |
248f219c | 662 | return; |
70790dbe | 663 | } |
17926a79 | 664 | |
17926a79 DH |
665 | } |
666 | ||
667 | /* | |
248f219c | 668 | * Process an ACKALL packet. |
17926a79 | 669 | */ |
248f219c | 670 | static void rxrpc_input_ackall(struct rxrpc_call *call, struct sk_buff *skb) |
17926a79 | 671 | { |
248f219c | 672 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
17926a79 | 673 | |
248f219c | 674 | _proto("Rx ACKALL %%%u", sp->hdr.serial); |
17926a79 | 675 | |
70790dbe DH |
676 | rxrpc_rotate_tx_window(call, call->tx_top); |
677 | if (test_bit(RXRPC_CALL_TX_LAST, &call->flags)) | |
678 | rxrpc_end_tx_phase(call, false, "ETL"); | |
248f219c | 679 | } |
17926a79 | 680 | |
248f219c DH |
681 | /* |
682 | * Process an ABORT packet. | |
683 | */ | |
684 | static void rxrpc_input_abort(struct rxrpc_call *call, struct sk_buff *skb) | |
685 | { | |
686 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
687 | __be32 wtmp; | |
688 | u32 abort_code = RX_CALL_DEAD; | |
17926a79 | 689 | |
248f219c | 690 | _enter(""); |
17926a79 | 691 | |
248f219c DH |
692 | if (skb->len >= 4 && |
693 | skb_copy_bits(skb, sp->offset, &wtmp, sizeof(wtmp)) >= 0) | |
694 | abort_code = ntohl(wtmp); | |
17926a79 | 695 | |
248f219c | 696 | _proto("Rx ABORT %%%u { %x }", sp->hdr.serial, abort_code); |
17926a79 | 697 | |
248f219c DH |
698 | if (rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED, |
699 | abort_code, ECONNABORTED)) | |
700 | rxrpc_notify_socket(call); | |
17926a79 DH |
701 | } |
702 | ||
703 | /* | |
248f219c | 704 | * Process an incoming call packet. |
17926a79 | 705 | */ |
248f219c DH |
706 | static void rxrpc_input_call_packet(struct rxrpc_call *call, |
707 | struct sk_buff *skb, u16 skew) | |
17926a79 | 708 | { |
248f219c | 709 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
17926a79 | 710 | |
7727640c | 711 | _enter("%p,%p", call, skb); |
17926a79 | 712 | |
248f219c DH |
713 | switch (sp->hdr.type) { |
714 | case RXRPC_PACKET_TYPE_DATA: | |
715 | rxrpc_input_data(call, skb, skew); | |
716 | break; | |
f5c17aae | 717 | |
248f219c DH |
718 | case RXRPC_PACKET_TYPE_ACK: |
719 | rxrpc_input_ack(call, skb, skew); | |
17926a79 | 720 | break; |
17926a79 | 721 | |
248f219c DH |
722 | case RXRPC_PACKET_TYPE_BUSY: |
723 | _proto("Rx BUSY %%%u", sp->hdr.serial); | |
17926a79 | 724 | |
248f219c DH |
725 | /* Just ignore BUSY packets from the server; the retry and |
726 | * lifespan timers will take care of business. BUSY packets | |
727 | * from the client don't make sense. | |
728 | */ | |
729 | break; | |
17926a79 | 730 | |
248f219c DH |
731 | case RXRPC_PACKET_TYPE_ABORT: |
732 | rxrpc_input_abort(call, skb); | |
733 | break; | |
17926a79 | 734 | |
248f219c DH |
735 | case RXRPC_PACKET_TYPE_ACKALL: |
736 | rxrpc_input_ackall(call, skb); | |
737 | break; | |
f5c17aae | 738 | |
248f219c DH |
739 | default: |
740 | _proto("Rx %s %%%u", rxrpc_pkts[sp->hdr.type], sp->hdr.serial); | |
741 | break; | |
17926a79 | 742 | } |
248f219c | 743 | |
17926a79 DH |
744 | _leave(""); |
745 | } | |
746 | ||
747 | /* | |
748 | * post connection-level events to the connection | |
18bfeba5 DH |
749 | * - this includes challenges, responses, some aborts and call terminal packet |
750 | * retransmission. | |
17926a79 | 751 | */ |
2e7e9758 | 752 | static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn, |
17926a79 DH |
753 | struct sk_buff *skb) |
754 | { | |
755 | _enter("%p,%p", conn, skb); | |
756 | ||
17926a79 | 757 | skb_queue_tail(&conn->rx_queue, skb); |
2e7e9758 | 758 | rxrpc_queue_conn(conn); |
17926a79 DH |
759 | } |
760 | ||
44ba0698 DH |
761 | /* |
762 | * post endpoint-level events to the local endpoint | |
763 | * - this includes debug and version messages | |
764 | */ | |
765 | static void rxrpc_post_packet_to_local(struct rxrpc_local *local, | |
766 | struct sk_buff *skb) | |
767 | { | |
768 | _enter("%p,%p", local, skb); | |
769 | ||
44ba0698 | 770 | skb_queue_tail(&local->event_queue, skb); |
5acbee46 | 771 | rxrpc_queue_local(local); |
44ba0698 DH |
772 | } |
773 | ||
248f219c DH |
774 | /* |
775 | * put a packet up for transport-level abort | |
776 | */ | |
777 | static void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb) | |
778 | { | |
779 | CHECK_SLAB_OKAY(&local->usage); | |
780 | ||
781 | skb_queue_tail(&local->reject_queue, skb); | |
782 | rxrpc_queue_local(local); | |
783 | } | |
784 | ||
0d12f8a4 DH |
785 | /* |
786 | * Extract the wire header from a packet and translate the byte order. | |
787 | */ | |
788 | static noinline | |
789 | int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb) | |
790 | { | |
791 | struct rxrpc_wire_header whdr; | |
792 | ||
793 | /* dig out the RxRPC connection details */ | |
4d0fc73e | 794 | if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0) |
0d12f8a4 | 795 | return -EBADMSG; |
0d12f8a4 DH |
796 | |
797 | memset(sp, 0, sizeof(*sp)); | |
798 | sp->hdr.epoch = ntohl(whdr.epoch); | |
799 | sp->hdr.cid = ntohl(whdr.cid); | |
800 | sp->hdr.callNumber = ntohl(whdr.callNumber); | |
801 | sp->hdr.seq = ntohl(whdr.seq); | |
802 | sp->hdr.serial = ntohl(whdr.serial); | |
803 | sp->hdr.flags = whdr.flags; | |
804 | sp->hdr.type = whdr.type; | |
805 | sp->hdr.userStatus = whdr.userStatus; | |
806 | sp->hdr.securityIndex = whdr.securityIndex; | |
807 | sp->hdr._rsvd = ntohs(whdr._rsvd); | |
808 | sp->hdr.serviceId = ntohs(whdr.serviceId); | |
248f219c | 809 | sp->offset = sizeof(whdr); |
0d12f8a4 DH |
810 | return 0; |
811 | } | |
812 | ||
17926a79 DH |
813 | /* |
814 | * handle data received on the local endpoint | |
815 | * - may be called in interrupt context | |
4f95dd78 DH |
816 | * |
817 | * The socket is locked by the caller and this prevents the socket from being | |
818 | * shut down and the local endpoint from going away, thus sk_user_data will not | |
819 | * be cleared until this function returns. | |
17926a79 | 820 | */ |
248f219c | 821 | void rxrpc_data_ready(struct sock *udp_sk) |
17926a79 | 822 | { |
8496af50 | 823 | struct rxrpc_connection *conn; |
248f219c DH |
824 | struct rxrpc_channel *chan; |
825 | struct rxrpc_call *call; | |
17926a79 | 826 | struct rxrpc_skb_priv *sp; |
248f219c | 827 | struct rxrpc_local *local = udp_sk->sk_user_data; |
17926a79 | 828 | struct sk_buff *skb; |
248f219c | 829 | unsigned int channel; |
563ea7d5 | 830 | int ret, skew; |
17926a79 | 831 | |
248f219c | 832 | _enter("%p", udp_sk); |
17926a79 DH |
833 | |
834 | ASSERT(!irqs_disabled()); | |
835 | ||
248f219c | 836 | skb = skb_recv_datagram(udp_sk, 0, 1, &ret); |
17926a79 | 837 | if (!skb) { |
17926a79 DH |
838 | if (ret == -EAGAIN) |
839 | return; | |
840 | _debug("UDP socket error %d", ret); | |
841 | return; | |
842 | } | |
843 | ||
71f3ca40 | 844 | rxrpc_new_skb(skb, rxrpc_skb_rx_received); |
17926a79 DH |
845 | |
846 | _net("recv skb %p", skb); | |
847 | ||
848 | /* we'll probably need to checksum it (didn't call sock_recvmsg) */ | |
849 | if (skb_checksum_complete(skb)) { | |
71f3ca40 | 850 | rxrpc_free_skb(skb, rxrpc_skb_rx_freed); |
02c22347 | 851 | __UDP_INC_STATS(&init_net, UDP_MIB_INERRORS, 0); |
17926a79 DH |
852 | _leave(" [CSUM failed]"); |
853 | return; | |
854 | } | |
855 | ||
02c22347 | 856 | __UDP_INC_STATS(&init_net, UDP_MIB_INDATAGRAMS, 0); |
1781f7f5 | 857 | |
0d12f8a4 DH |
858 | /* The socket buffer we have is owned by UDP, with UDP's data all over |
859 | * it, but we really want our own data there. | |
860 | */ | |
17926a79 DH |
861 | skb_orphan(skb); |
862 | sp = rxrpc_skb(skb); | |
17926a79 | 863 | |
89b475ab DH |
864 | /* dig out the RxRPC connection details */ |
865 | if (rxrpc_extract_header(sp, skb) < 0) | |
866 | goto bad_message; | |
867 | ||
8a681c36 DH |
868 | if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) { |
869 | static int lose; | |
870 | if ((lose++ & 7) == 7) { | |
89b475ab | 871 | trace_rxrpc_rx_lose(sp); |
8a681c36 DH |
872 | rxrpc_lose_skb(skb, rxrpc_skb_rx_lost); |
873 | return; | |
874 | } | |
875 | } | |
876 | ||
49e19ec7 | 877 | trace_rxrpc_rx_packet(sp); |
17926a79 DH |
878 | |
879 | _net("Rx RxRPC %s ep=%x call=%x:%x", | |
880 | sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient", | |
0d12f8a4 | 881 | sp->hdr.epoch, sp->hdr.cid, sp->hdr.callNumber); |
17926a79 | 882 | |
351c1e64 DH |
883 | if (sp->hdr.type >= RXRPC_N_PACKET_TYPES || |
884 | !((RXRPC_SUPPORTED_PACKET_TYPES >> sp->hdr.type) & 1)) { | |
17926a79 DH |
885 | _proto("Rx Bad Packet Type %u", sp->hdr.type); |
886 | goto bad_message; | |
887 | } | |
888 | ||
248f219c DH |
889 | switch (sp->hdr.type) { |
890 | case RXRPC_PACKET_TYPE_VERSION: | |
44ba0698 DH |
891 | rxrpc_post_packet_to_local(local, skb); |
892 | goto out; | |
bc6e1ea3 | 893 | |
248f219c DH |
894 | case RXRPC_PACKET_TYPE_BUSY: |
895 | if (sp->hdr.flags & RXRPC_CLIENT_INITIATED) | |
896 | goto discard; | |
897 | ||
898 | case RXRPC_PACKET_TYPE_DATA: | |
899 | if (sp->hdr.callNumber == 0) | |
900 | goto bad_message; | |
901 | if (sp->hdr.flags & RXRPC_JUMBO_PACKET && | |
902 | !rxrpc_validate_jumbo(skb)) | |
903 | goto bad_message; | |
904 | break; | |
905 | } | |
17926a79 | 906 | |
8496af50 DH |
907 | rcu_read_lock(); |
908 | ||
8496af50 | 909 | conn = rxrpc_find_connection_rcu(local, skb); |
248f219c DH |
910 | if (conn) { |
911 | if (sp->hdr.securityIndex != conn->security_ix) | |
912 | goto wrong_security; | |
563ea7d5 | 913 | |
248f219c DH |
914 | if (sp->hdr.callNumber == 0) { |
915 | /* Connection-level packet */ | |
916 | _debug("CONN %p {%d}", conn, conn->debug_id); | |
917 | rxrpc_post_packet_to_conn(conn, skb); | |
918 | goto out_unlock; | |
919 | } | |
920 | ||
921 | /* Note the serial number skew here */ | |
922 | skew = (int)sp->hdr.serial - (int)conn->hi_serial; | |
923 | if (skew >= 0) { | |
924 | if (skew > 0) | |
925 | conn->hi_serial = sp->hdr.serial; | |
926 | } else { | |
927 | skew = -skew; | |
928 | skew = min(skew, 65535); | |
929 | } | |
17926a79 | 930 | |
8496af50 | 931 | /* Call-bound packets are routed by connection channel. */ |
248f219c DH |
932 | channel = sp->hdr.cid & RXRPC_CHANNELMASK; |
933 | chan = &conn->channels[channel]; | |
18bfeba5 DH |
934 | |
935 | /* Ignore really old calls */ | |
936 | if (sp->hdr.callNumber < chan->last_call) | |
937 | goto discard_unlock; | |
938 | ||
939 | if (sp->hdr.callNumber == chan->last_call) { | |
248f219c DH |
940 | /* For the previous service call, if completed successfully, we |
941 | * discard all further packets. | |
18bfeba5 | 942 | */ |
2266ffde | 943 | if (rxrpc_conn_is_service(conn) && |
18bfeba5 DH |
944 | (chan->last_type == RXRPC_PACKET_TYPE_ACK || |
945 | sp->hdr.type == RXRPC_PACKET_TYPE_ABORT)) | |
946 | goto discard_unlock; | |
947 | ||
248f219c DH |
948 | /* But otherwise we need to retransmit the final packet from |
949 | * data cached in the connection record. | |
18bfeba5 DH |
950 | */ |
951 | rxrpc_post_packet_to_conn(conn, skb); | |
952 | goto out_unlock; | |
953 | } | |
0d12f8a4 | 954 | |
18bfeba5 | 955 | call = rcu_dereference(chan->call); |
248f219c DH |
956 | } else { |
957 | skew = 0; | |
958 | call = NULL; | |
959 | } | |
8496af50 | 960 | |
248f219c DH |
961 | if (!call || atomic_read(&call->usage) == 0) { |
962 | if (!(sp->hdr.type & RXRPC_CLIENT_INITIATED) || | |
963 | sp->hdr.callNumber == 0 || | |
964 | sp->hdr.type != RXRPC_PACKET_TYPE_DATA) | |
965 | goto bad_message_unlock; | |
966 | if (sp->hdr.seq != 1) | |
967 | goto discard_unlock; | |
968 | call = rxrpc_new_incoming_call(local, conn, skb); | |
969 | if (!call) { | |
970 | rcu_read_unlock(); | |
971 | goto reject_packet; | |
972 | } | |
8e83134d | 973 | rxrpc_send_ping(call, skb, skew); |
7727640c | 974 | } |
44ba0698 | 975 | |
248f219c DH |
976 | rxrpc_input_call_packet(call, skb, skew); |
977 | goto discard_unlock; | |
978 | ||
18bfeba5 | 979 | discard_unlock: |
8496af50 | 980 | rcu_read_unlock(); |
248f219c | 981 | discard: |
71f3ca40 | 982 | rxrpc_free_skb(skb, rxrpc_skb_rx_freed); |
44ba0698 | 983 | out: |
49e19ec7 | 984 | trace_rxrpc_rx_done(0, 0); |
17926a79 DH |
985 | return; |
986 | ||
248f219c | 987 | out_unlock: |
8496af50 | 988 | rcu_read_unlock(); |
248f219c | 989 | goto out; |
8496af50 | 990 | |
248f219c DH |
991 | wrong_security: |
992 | rcu_read_unlock(); | |
993 | trace_rxrpc_abort("SEC", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, | |
994 | RXKADINCONSISTENCY, EBADMSG); | |
995 | skb->priority = RXKADINCONSISTENCY; | |
996 | goto post_abort; | |
17926a79 | 997 | |
248f219c DH |
998 | bad_message_unlock: |
999 | rcu_read_unlock(); | |
17926a79 | 1000 | bad_message: |
248f219c DH |
1001 | trace_rxrpc_abort("BAD", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, |
1002 | RX_PROTOCOL_ERROR, EBADMSG); | |
17926a79 | 1003 | skb->priority = RX_PROTOCOL_ERROR; |
248f219c DH |
1004 | post_abort: |
1005 | skb->mark = RXRPC_SKB_MARK_LOCAL_ABORT; | |
49e19ec7 DH |
1006 | reject_packet: |
1007 | trace_rxrpc_rx_done(skb->mark, skb->priority); | |
17926a79 | 1008 | rxrpc_reject_packet(local, skb); |
17926a79 DH |
1009 | _leave(" [badmsg]"); |
1010 | } |