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Commit | Line | Data |
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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 | { | |
3a92789a | 33 | if (rxrpc_abort_call(why, call, seq, RX_PROTOCOL_ERROR, -EBADMSG)) { |
248f219c DH |
34 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
35 | rxrpc_queue_call(call); | |
36 | } | |
37 | } | |
38 | ||
57494343 DH |
39 | /* |
40 | * Do TCP-style congestion management [RFC 5681]. | |
41 | */ | |
42 | static void rxrpc_congestion_management(struct rxrpc_call *call, | |
43 | struct sk_buff *skb, | |
ed1e8679 DH |
44 | struct rxrpc_ack_summary *summary, |
45 | rxrpc_serial_t acked_serial) | |
57494343 DH |
46 | { |
47 | enum rxrpc_congest_change change = rxrpc_cong_no_change; | |
57494343 DH |
48 | unsigned int cumulative_acks = call->cong_cumul_acks; |
49 | unsigned int cwnd = call->cong_cwnd; | |
50 | bool resend = false; | |
51 | ||
52 | summary->flight_size = | |
53 | (call->tx_top - call->tx_hard_ack) - summary->nr_acks; | |
54 | ||
55 | if (test_and_clear_bit(RXRPC_CALL_RETRANS_TIMEOUT, &call->flags)) { | |
56 | summary->retrans_timeo = true; | |
57 | call->cong_ssthresh = max_t(unsigned int, | |
58 | summary->flight_size / 2, 2); | |
59 | cwnd = 1; | |
8782def2 | 60 | if (cwnd >= call->cong_ssthresh && |
57494343 DH |
61 | call->cong_mode == RXRPC_CALL_SLOW_START) { |
62 | call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE; | |
63 | call->cong_tstamp = skb->tstamp; | |
64 | cumulative_acks = 0; | |
65 | } | |
66 | } | |
67 | ||
68 | cumulative_acks += summary->nr_new_acks; | |
69 | cumulative_acks += summary->nr_rot_new_acks; | |
70 | if (cumulative_acks > 255) | |
71 | cumulative_acks = 255; | |
72 | ||
73 | summary->mode = call->cong_mode; | |
74 | summary->cwnd = call->cong_cwnd; | |
75 | summary->ssthresh = call->cong_ssthresh; | |
76 | summary->cumulative_acks = cumulative_acks; | |
77 | summary->dup_acks = call->cong_dup_acks; | |
78 | ||
79 | switch (call->cong_mode) { | |
80 | case RXRPC_CALL_SLOW_START: | |
81 | if (summary->nr_nacks > 0) | |
82 | goto packet_loss_detected; | |
83 | if (summary->cumulative_acks > 0) | |
84 | cwnd += 1; | |
8782def2 | 85 | if (cwnd >= call->cong_ssthresh) { |
57494343 DH |
86 | call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE; |
87 | call->cong_tstamp = skb->tstamp; | |
88 | } | |
89 | goto out; | |
90 | ||
91 | case RXRPC_CALL_CONGEST_AVOIDANCE: | |
92 | if (summary->nr_nacks > 0) | |
93 | goto packet_loss_detected; | |
94 | ||
95 | /* We analyse the number of packets that get ACK'd per RTT | |
96 | * period and increase the window if we managed to fill it. | |
97 | */ | |
98 | if (call->peer->rtt_usage == 0) | |
99 | goto out; | |
100 | if (ktime_before(skb->tstamp, | |
101 | ktime_add_ns(call->cong_tstamp, | |
102 | call->peer->rtt))) | |
103 | goto out_no_clear_ca; | |
104 | change = rxrpc_cong_rtt_window_end; | |
105 | call->cong_tstamp = skb->tstamp; | |
106 | if (cumulative_acks >= cwnd) | |
107 | cwnd++; | |
108 | goto out; | |
109 | ||
110 | case RXRPC_CALL_PACKET_LOSS: | |
111 | if (summary->nr_nacks == 0) | |
112 | goto resume_normality; | |
113 | ||
114 | if (summary->new_low_nack) { | |
115 | change = rxrpc_cong_new_low_nack; | |
116 | call->cong_dup_acks = 1; | |
117 | if (call->cong_extra > 1) | |
118 | call->cong_extra = 1; | |
119 | goto send_extra_data; | |
120 | } | |
121 | ||
122 | call->cong_dup_acks++; | |
123 | if (call->cong_dup_acks < 3) | |
124 | goto send_extra_data; | |
125 | ||
126 | change = rxrpc_cong_begin_retransmission; | |
127 | call->cong_mode = RXRPC_CALL_FAST_RETRANSMIT; | |
128 | call->cong_ssthresh = max_t(unsigned int, | |
129 | summary->flight_size / 2, 2); | |
130 | cwnd = call->cong_ssthresh + 3; | |
131 | call->cong_extra = 0; | |
132 | call->cong_dup_acks = 0; | |
133 | resend = true; | |
134 | goto out; | |
135 | ||
136 | case RXRPC_CALL_FAST_RETRANSMIT: | |
137 | if (!summary->new_low_nack) { | |
138 | if (summary->nr_new_acks == 0) | |
139 | cwnd += 1; | |
140 | call->cong_dup_acks++; | |
141 | if (call->cong_dup_acks == 2) { | |
142 | change = rxrpc_cong_retransmit_again; | |
143 | call->cong_dup_acks = 0; | |
144 | resend = true; | |
145 | } | |
146 | } else { | |
147 | change = rxrpc_cong_progress; | |
148 | cwnd = call->cong_ssthresh; | |
149 | if (summary->nr_nacks == 0) | |
150 | goto resume_normality; | |
151 | } | |
152 | goto out; | |
153 | ||
154 | default: | |
155 | BUG(); | |
156 | goto out; | |
157 | } | |
158 | ||
159 | resume_normality: | |
160 | change = rxrpc_cong_cleared_nacks; | |
161 | call->cong_dup_acks = 0; | |
162 | call->cong_extra = 0; | |
163 | call->cong_tstamp = skb->tstamp; | |
8782def2 | 164 | if (cwnd < call->cong_ssthresh) |
57494343 DH |
165 | call->cong_mode = RXRPC_CALL_SLOW_START; |
166 | else | |
167 | call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE; | |
168 | out: | |
169 | cumulative_acks = 0; | |
170 | out_no_clear_ca: | |
171 | if (cwnd >= RXRPC_RXTX_BUFF_SIZE - 1) | |
172 | cwnd = RXRPC_RXTX_BUFF_SIZE - 1; | |
173 | call->cong_cwnd = cwnd; | |
174 | call->cong_cumul_acks = cumulative_acks; | |
ed1e8679 | 175 | trace_rxrpc_congest(call, summary, acked_serial, change); |
57494343 DH |
176 | if (resend && !test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) |
177 | rxrpc_queue_call(call); | |
178 | return; | |
179 | ||
180 | packet_loss_detected: | |
181 | change = rxrpc_cong_saw_nack; | |
182 | call->cong_mode = RXRPC_CALL_PACKET_LOSS; | |
183 | call->cong_dup_acks = 0; | |
184 | goto send_extra_data; | |
185 | ||
186 | send_extra_data: | |
187 | /* Send some previously unsent DATA if we have some to advance the ACK | |
188 | * state. | |
189 | */ | |
190 | if (call->rxtx_annotations[call->tx_top & RXRPC_RXTX_BUFF_MASK] & | |
191 | RXRPC_TX_ANNO_LAST || | |
192 | summary->nr_acks != call->tx_top - call->tx_hard_ack) { | |
193 | call->cong_extra++; | |
194 | wake_up(&call->waitq); | |
195 | } | |
196 | goto out_no_clear_ca; | |
197 | } | |
198 | ||
8e83134d DH |
199 | /* |
200 | * Ping the other end to fill our RTT cache and to retrieve the rwind | |
201 | * and MTU parameters. | |
202 | */ | |
203 | static void rxrpc_send_ping(struct rxrpc_call *call, struct sk_buff *skb, | |
204 | int skew) | |
205 | { | |
206 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
fc943f67 | 207 | ktime_t now = skb->tstamp; |
8e83134d | 208 | |
fc943f67 DH |
209 | if (call->peer->rtt_usage < 3 || |
210 | ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000), now)) | |
211 | rxrpc_propose_ACK(call, RXRPC_ACK_PING, skew, sp->hdr.serial, | |
9c7ad434 DH |
212 | true, true, |
213 | rxrpc_propose_ack_ping_for_params); | |
8e83134d DH |
214 | } |
215 | ||
17926a79 | 216 | /* |
248f219c | 217 | * Apply a hard ACK by advancing the Tx window. |
17926a79 | 218 | */ |
c479d5f2 | 219 | static bool rxrpc_rotate_tx_window(struct rxrpc_call *call, rxrpc_seq_t to, |
31a1b989 | 220 | struct rxrpc_ack_summary *summary) |
17926a79 | 221 | { |
248f219c | 222 | struct sk_buff *skb, *list = NULL; |
c479d5f2 | 223 | bool rot_last = false; |
248f219c | 224 | int ix; |
70790dbe | 225 | u8 annotation; |
17926a79 | 226 | |
31a1b989 DH |
227 | if (call->acks_lowest_nak == call->tx_hard_ack) { |
228 | call->acks_lowest_nak = to; | |
229 | } else if (before_eq(call->acks_lowest_nak, to)) { | |
230 | summary->new_low_nack = true; | |
231 | call->acks_lowest_nak = to; | |
232 | } | |
233 | ||
248f219c | 234 | spin_lock(&call->lock); |
17926a79 | 235 | |
248f219c DH |
236 | while (before(call->tx_hard_ack, to)) { |
237 | call->tx_hard_ack++; | |
238 | ix = call->tx_hard_ack & RXRPC_RXTX_BUFF_MASK; | |
239 | skb = call->rxtx_buffer[ix]; | |
70790dbe | 240 | annotation = call->rxtx_annotations[ix]; |
71f3ca40 | 241 | rxrpc_see_skb(skb, rxrpc_skb_tx_rotated); |
248f219c DH |
242 | call->rxtx_buffer[ix] = NULL; |
243 | call->rxtx_annotations[ix] = 0; | |
244 | skb->next = list; | |
245 | list = skb; | |
70790dbe | 246 | |
c479d5f2 | 247 | if (annotation & RXRPC_TX_ANNO_LAST) { |
70790dbe | 248 | set_bit(RXRPC_CALL_TX_LAST, &call->flags); |
c479d5f2 DH |
249 | rot_last = true; |
250 | } | |
31a1b989 DH |
251 | if ((annotation & RXRPC_TX_ANNO_MASK) != RXRPC_TX_ANNO_ACK) |
252 | summary->nr_rot_new_acks++; | |
248f219c | 253 | } |
17926a79 | 254 | |
248f219c | 255 | spin_unlock(&call->lock); |
17926a79 | 256 | |
c479d5f2 | 257 | trace_rxrpc_transmit(call, (rot_last ? |
70790dbe DH |
258 | rxrpc_transmit_rotate_last : |
259 | rxrpc_transmit_rotate)); | |
bc4abfcf DH |
260 | wake_up(&call->waitq); |
261 | ||
248f219c DH |
262 | while (list) { |
263 | skb = list; | |
264 | list = skb->next; | |
a8305bff | 265 | skb_mark_not_on_list(skb); |
71f3ca40 | 266 | rxrpc_free_skb(skb, rxrpc_skb_tx_freed); |
17926a79 | 267 | } |
c479d5f2 DH |
268 | |
269 | return rot_last; | |
248f219c | 270 | } |
17926a79 | 271 | |
248f219c DH |
272 | /* |
273 | * End the transmission phase of a call. | |
274 | * | |
275 | * This occurs when we get an ACKALL packet, the first DATA packet of a reply, | |
276 | * or a final ACK packet. | |
277 | */ | |
70790dbe DH |
278 | static bool rxrpc_end_tx_phase(struct rxrpc_call *call, bool reply_begun, |
279 | const char *abort_why) | |
248f219c | 280 | { |
dfe99522 | 281 | unsigned int state; |
17926a79 | 282 | |
70790dbe | 283 | ASSERT(test_bit(RXRPC_CALL_TX_LAST, &call->flags)); |
17926a79 | 284 | |
248f219c | 285 | write_lock(&call->state_lock); |
651350d1 | 286 | |
dfe99522 DH |
287 | state = call->state; |
288 | switch (state) { | |
70790dbe | 289 | case RXRPC_CALL_CLIENT_SEND_REQUEST: |
248f219c | 290 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: |
70790dbe | 291 | if (reply_begun) |
dfe99522 | 292 | call->state = state = RXRPC_CALL_CLIENT_RECV_REPLY; |
70790dbe | 293 | else |
dfe99522 | 294 | call->state = state = RXRPC_CALL_CLIENT_AWAIT_REPLY; |
248f219c | 295 | break; |
70790dbe | 296 | |
248f219c DH |
297 | case RXRPC_CALL_SERVER_AWAIT_ACK: |
298 | __rxrpc_call_completed(call); | |
299 | rxrpc_notify_socket(call); | |
dfe99522 | 300 | state = call->state; |
248f219c | 301 | break; |
70790dbe DH |
302 | |
303 | default: | |
304 | goto bad_state; | |
17926a79 | 305 | } |
17926a79 | 306 | |
248f219c | 307 | write_unlock(&call->state_lock); |
dfe99522 | 308 | if (state == RXRPC_CALL_CLIENT_AWAIT_REPLY) |
70790dbe | 309 | trace_rxrpc_transmit(call, rxrpc_transmit_await_reply); |
dfe99522 | 310 | else |
70790dbe | 311 | trace_rxrpc_transmit(call, rxrpc_transmit_end); |
248f219c DH |
312 | _leave(" = ok"); |
313 | return true; | |
70790dbe DH |
314 | |
315 | bad_state: | |
316 | write_unlock(&call->state_lock); | |
317 | kdebug("end_tx %s", rxrpc_call_states[call->state]); | |
318 | rxrpc_proto_abort(abort_why, call, call->tx_top); | |
319 | return false; | |
320 | } | |
321 | ||
322 | /* | |
323 | * Begin the reply reception phase of a call. | |
324 | */ | |
325 | static bool rxrpc_receiving_reply(struct rxrpc_call *call) | |
326 | { | |
31a1b989 | 327 | struct rxrpc_ack_summary summary = { 0 }; |
a158bdd3 | 328 | unsigned long now, timo; |
70790dbe DH |
329 | rxrpc_seq_t top = READ_ONCE(call->tx_top); |
330 | ||
dd7c1ee5 DH |
331 | if (call->ackr_reason) { |
332 | spin_lock_bh(&call->lock); | |
333 | call->ackr_reason = 0; | |
dd7c1ee5 | 334 | spin_unlock_bh(&call->lock); |
a158bdd3 DH |
335 | now = jiffies; |
336 | timo = now + MAX_JIFFY_OFFSET; | |
337 | WRITE_ONCE(call->resend_at, timo); | |
338 | WRITE_ONCE(call->ack_at, timo); | |
339 | trace_rxrpc_timer(call, rxrpc_timer_init_for_reply, now); | |
dd7c1ee5 DH |
340 | } |
341 | ||
70790dbe | 342 | if (!test_bit(RXRPC_CALL_TX_LAST, &call->flags)) { |
c479d5f2 DH |
343 | if (!rxrpc_rotate_tx_window(call, top, &summary)) { |
344 | rxrpc_proto_abort("TXL", call, top); | |
345 | return false; | |
346 | } | |
70790dbe DH |
347 | } |
348 | if (!rxrpc_end_tx_phase(call, true, "ETD")) | |
349 | return false; | |
350 | call->tx_phase = false; | |
351 | return true; | |
248f219c DH |
352 | } |
353 | ||
354 | /* | |
355 | * Scan a jumbo packet to validate its structure and to work out how many | |
356 | * subpackets it contains. | |
357 | * | |
358 | * A jumbo packet is a collection of consecutive packets glued together with | |
359 | * little headers between that indicate how to change the initial header for | |
360 | * each subpacket. | |
361 | * | |
362 | * RXRPC_JUMBO_PACKET must be set on all but the last subpacket - and all but | |
363 | * the last are RXRPC_JUMBO_DATALEN in size. The last subpacket may be of any | |
364 | * size. | |
365 | */ | |
366 | static bool rxrpc_validate_jumbo(struct sk_buff *skb) | |
367 | { | |
368 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
775e5b71 | 369 | unsigned int offset = sizeof(struct rxrpc_wire_header); |
89a80ed4 | 370 | unsigned int len = skb->len; |
248f219c DH |
371 | int nr_jumbo = 1; |
372 | u8 flags = sp->hdr.flags; | |
373 | ||
374 | do { | |
375 | nr_jumbo++; | |
376 | if (len - offset < RXRPC_JUMBO_SUBPKTLEN) | |
377 | goto protocol_error; | |
378 | if (flags & RXRPC_LAST_PACKET) | |
379 | goto protocol_error; | |
380 | offset += RXRPC_JUMBO_DATALEN; | |
381 | if (skb_copy_bits(skb, offset, &flags, 1) < 0) | |
382 | goto protocol_error; | |
383 | offset += sizeof(struct rxrpc_jumbo_header); | |
384 | } while (flags & RXRPC_JUMBO_PACKET); | |
385 | ||
386 | sp->nr_jumbo = nr_jumbo; | |
387 | return true; | |
17926a79 | 388 | |
248f219c DH |
389 | protocol_error: |
390 | return false; | |
17926a79 DH |
391 | } |
392 | ||
393 | /* | |
248f219c DH |
394 | * Handle reception of a duplicate packet. |
395 | * | |
396 | * We have to take care to avoid an attack here whereby we're given a series of | |
397 | * jumbograms, each with a sequence number one before the preceding one and | |
398 | * filled up to maximum UDP size. If they never send us the first packet in | |
399 | * the sequence, they can cause us to have to hold on to around 2MiB of kernel | |
400 | * space until the call times out. | |
401 | * | |
402 | * We limit the space usage by only accepting three duplicate jumbo packets per | |
403 | * call. After that, we tell the other side we're no longer accepting jumbos | |
404 | * (that information is encoded in the ACK packet). | |
17926a79 | 405 | */ |
248f219c | 406 | static void rxrpc_input_dup_data(struct rxrpc_call *call, rxrpc_seq_t seq, |
75e42126 | 407 | u8 annotation, bool *_jumbo_bad) |
17926a79 | 408 | { |
248f219c DH |
409 | /* Discard normal packets that are duplicates. */ |
410 | if (annotation == 0) | |
411 | return; | |
17926a79 | 412 | |
248f219c DH |
413 | /* Skip jumbo subpackets that are duplicates. When we've had three or |
414 | * more partially duplicate jumbo packets, we refuse to take any more | |
415 | * jumbos for this call. | |
416 | */ | |
75e42126 DH |
417 | if (!*_jumbo_bad) { |
418 | call->nr_jumbo_bad++; | |
419 | *_jumbo_bad = true; | |
248f219c DH |
420 | } |
421 | } | |
17926a79 | 422 | |
248f219c DH |
423 | /* |
424 | * Process a DATA packet, adding the packet to the Rx ring. | |
425 | */ | |
426 | static void rxrpc_input_data(struct rxrpc_call *call, struct sk_buff *skb, | |
427 | u16 skew) | |
428 | { | |
429 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
146d8fef | 430 | enum rxrpc_call_state state; |
775e5b71 | 431 | unsigned int offset = sizeof(struct rxrpc_wire_header); |
248f219c DH |
432 | unsigned int ix; |
433 | rxrpc_serial_t serial = sp->hdr.serial, ack_serial = 0; | |
434 | rxrpc_seq_t seq = sp->hdr.seq, hard_ack; | |
75e42126 | 435 | bool immediate_ack = false, jumbo_bad = false, queued; |
248f219c DH |
436 | u16 len; |
437 | u8 ack = 0, flags, annotation = 0; | |
17926a79 | 438 | |
248f219c | 439 | _enter("{%u,%u},{%u,%u}", |
89a80ed4 | 440 | call->rx_hard_ack, call->rx_top, skb->len, seq); |
17926a79 | 441 | |
248f219c DH |
442 | _proto("Rx DATA %%%u { #%u f=%02x }", |
443 | sp->hdr.serial, seq, sp->hdr.flags); | |
17926a79 | 444 | |
146d8fef DH |
445 | state = READ_ONCE(call->state); |
446 | if (state >= RXRPC_CALL_COMPLETE) | |
248f219c | 447 | return; |
17926a79 | 448 | |
a158bdd3 DH |
449 | if (call->state == RXRPC_CALL_SERVER_RECV_REQUEST) { |
450 | unsigned long timo = READ_ONCE(call->next_req_timo); | |
451 | unsigned long now, expect_req_by; | |
452 | ||
453 | if (timo) { | |
454 | now = jiffies; | |
455 | expect_req_by = now + timo; | |
456 | WRITE_ONCE(call->expect_req_by, expect_req_by); | |
457 | rxrpc_reduce_call_timer(call, expect_req_by, now, | |
458 | rxrpc_timer_set_for_idle); | |
459 | } | |
460 | } | |
461 | ||
c1e15b49 DH |
462 | spin_lock(&call->input_lock); |
463 | ||
248f219c DH |
464 | /* Received data implicitly ACKs all of the request packets we sent |
465 | * when we're acting as a client. | |
466 | */ | |
146d8fef DH |
467 | if ((state == RXRPC_CALL_CLIENT_SEND_REQUEST || |
468 | state == RXRPC_CALL_CLIENT_AWAIT_REPLY) && | |
70790dbe | 469 | !rxrpc_receiving_reply(call)) |
c1e15b49 | 470 | goto unlock; |
17926a79 | 471 | |
248f219c | 472 | call->ackr_prev_seq = seq; |
17926a79 | 473 | |
248f219c DH |
474 | hard_ack = READ_ONCE(call->rx_hard_ack); |
475 | if (after(seq, hard_ack + call->rx_winsize)) { | |
17926a79 | 476 | ack = RXRPC_ACK_EXCEEDS_WINDOW; |
248f219c DH |
477 | ack_serial = serial; |
478 | goto ack; | |
17926a79 DH |
479 | } |
480 | ||
248f219c DH |
481 | flags = sp->hdr.flags; |
482 | if (flags & RXRPC_JUMBO_PACKET) { | |
75e42126 | 483 | if (call->nr_jumbo_bad > 3) { |
248f219c DH |
484 | ack = RXRPC_ACK_NOSPACE; |
485 | ack_serial = serial; | |
486 | goto ack; | |
17926a79 | 487 | } |
248f219c | 488 | annotation = 1; |
17926a79 DH |
489 | } |
490 | ||
248f219c DH |
491 | next_subpacket: |
492 | queued = false; | |
493 | ix = seq & RXRPC_RXTX_BUFF_MASK; | |
89a80ed4 | 494 | len = skb->len; |
248f219c DH |
495 | if (flags & RXRPC_JUMBO_PACKET) |
496 | len = RXRPC_JUMBO_DATALEN; | |
497 | ||
498 | if (flags & RXRPC_LAST_PACKET) { | |
816c9fce | 499 | if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) && |
c1e15b49 DH |
500 | seq != call->rx_top) { |
501 | rxrpc_proto_abort("LSN", call, seq); | |
502 | goto unlock; | |
503 | } | |
248f219c DH |
504 | } else { |
505 | if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) && | |
c1e15b49 DH |
506 | after_eq(seq, call->rx_top)) { |
507 | rxrpc_proto_abort("LSA", call, seq); | |
508 | goto unlock; | |
509 | } | |
17926a79 DH |
510 | } |
511 | ||
4764c0da | 512 | trace_rxrpc_rx_data(call->debug_id, seq, serial, flags, annotation); |
248f219c DH |
513 | if (before_eq(seq, hard_ack)) { |
514 | ack = RXRPC_ACK_DUPLICATE; | |
515 | ack_serial = serial; | |
516 | goto skip; | |
517 | } | |
518 | ||
519 | if (flags & RXRPC_REQUEST_ACK && !ack) { | |
520 | ack = RXRPC_ACK_REQUESTED; | |
521 | ack_serial = serial; | |
522 | } | |
523 | ||
524 | if (call->rxtx_buffer[ix]) { | |
75e42126 | 525 | rxrpc_input_dup_data(call, seq, annotation, &jumbo_bad); |
248f219c DH |
526 | if (ack != RXRPC_ACK_DUPLICATE) { |
527 | ack = RXRPC_ACK_DUPLICATE; | |
528 | ack_serial = serial; | |
17926a79 | 529 | } |
248f219c DH |
530 | immediate_ack = true; |
531 | goto skip; | |
17926a79 DH |
532 | } |
533 | ||
248f219c DH |
534 | /* Queue the packet. We use a couple of memory barriers here as need |
535 | * to make sure that rx_top is perceived to be set after the buffer | |
536 | * pointer and that the buffer pointer is set after the annotation and | |
537 | * the skb data. | |
538 | * | |
539 | * Barriers against rxrpc_recvmsg_data() and rxrpc_rotate_rx_window() | |
540 | * and also rxrpc_fill_out_ack(). | |
541 | */ | |
71f3ca40 | 542 | rxrpc_get_skb(skb, rxrpc_skb_rx_got); |
248f219c DH |
543 | call->rxtx_annotations[ix] = annotation; |
544 | smp_wmb(); | |
545 | call->rxtx_buffer[ix] = skb; | |
a7056c5b | 546 | if (after(seq, call->rx_top)) { |
248f219c | 547 | smp_store_release(&call->rx_top, seq); |
a7056c5b DH |
548 | } else if (before(seq, call->rx_top)) { |
549 | /* Send an immediate ACK if we fill in a hole */ | |
550 | if (!ack) { | |
551 | ack = RXRPC_ACK_DELAY; | |
552 | ack_serial = serial; | |
553 | } | |
554 | immediate_ack = true; | |
555 | } | |
58dc63c9 | 556 | if (flags & RXRPC_LAST_PACKET) { |
816c9fce | 557 | set_bit(RXRPC_CALL_RX_LAST, &call->flags); |
58dc63c9 DH |
558 | trace_rxrpc_receive(call, rxrpc_receive_queue_last, serial, seq); |
559 | } else { | |
560 | trace_rxrpc_receive(call, rxrpc_receive_queue, serial, seq); | |
561 | } | |
248f219c DH |
562 | queued = true; |
563 | ||
564 | if (after_eq(seq, call->rx_expect_next)) { | |
565 | if (after(seq, call->rx_expect_next)) { | |
566 | _net("OOS %u > %u", seq, call->rx_expect_next); | |
567 | ack = RXRPC_ACK_OUT_OF_SEQUENCE; | |
568 | ack_serial = serial; | |
569 | } | |
570 | call->rx_expect_next = seq + 1; | |
17926a79 DH |
571 | } |
572 | ||
248f219c DH |
573 | skip: |
574 | offset += len; | |
575 | if (flags & RXRPC_JUMBO_PACKET) { | |
c1e15b49 DH |
576 | if (skb_copy_bits(skb, offset, &flags, 1) < 0) { |
577 | rxrpc_proto_abort("XJF", call, seq); | |
578 | goto unlock; | |
579 | } | |
248f219c DH |
580 | offset += sizeof(struct rxrpc_jumbo_header); |
581 | seq++; | |
582 | serial++; | |
583 | annotation++; | |
584 | if (flags & RXRPC_JUMBO_PACKET) | |
585 | annotation |= RXRPC_RX_ANNO_JLAST; | |
75e42126 DH |
586 | if (after(seq, hard_ack + call->rx_winsize)) { |
587 | ack = RXRPC_ACK_EXCEEDS_WINDOW; | |
588 | ack_serial = serial; | |
589 | if (!jumbo_bad) { | |
590 | call->nr_jumbo_bad++; | |
591 | jumbo_bad = true; | |
592 | } | |
593 | goto ack; | |
594 | } | |
248f219c DH |
595 | |
596 | _proto("Rx DATA Jumbo %%%u", serial); | |
597 | goto next_subpacket; | |
598 | } | |
17926a79 | 599 | |
248f219c DH |
600 | if (queued && flags & RXRPC_LAST_PACKET && !ack) { |
601 | ack = RXRPC_ACK_DELAY; | |
602 | ack_serial = serial; | |
603 | } | |
17926a79 | 604 | |
248f219c DH |
605 | ack: |
606 | if (ack) | |
607 | rxrpc_propose_ACK(call, ack, skew, ack_serial, | |
9c7ad434 DH |
608 | immediate_ack, true, |
609 | rxrpc_propose_ack_input_data); | |
4764c0da DH |
610 | else |
611 | rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, skew, serial, | |
612 | false, true, | |
613 | rxrpc_propose_ack_input_data); | |
17926a79 | 614 | |
4272d303 DH |
615 | if (sp->hdr.seq == READ_ONCE(call->rx_hard_ack) + 1) { |
616 | trace_rxrpc_notify_socket(call->debug_id, serial); | |
248f219c | 617 | rxrpc_notify_socket(call); |
4272d303 | 618 | } |
c1e15b49 DH |
619 | |
620 | unlock: | |
621 | spin_unlock(&call->input_lock); | |
248f219c | 622 | _leave(" [queued]"); |
17926a79 DH |
623 | } |
624 | ||
50235c4b DH |
625 | /* |
626 | * Process a requested ACK. | |
627 | */ | |
628 | static void rxrpc_input_requested_ack(struct rxrpc_call *call, | |
629 | ktime_t resp_time, | |
630 | rxrpc_serial_t orig_serial, | |
631 | rxrpc_serial_t ack_serial) | |
632 | { | |
633 | struct rxrpc_skb_priv *sp; | |
634 | struct sk_buff *skb; | |
635 | ktime_t sent_at; | |
636 | int ix; | |
637 | ||
638 | for (ix = 0; ix < RXRPC_RXTX_BUFF_SIZE; ix++) { | |
639 | skb = call->rxtx_buffer[ix]; | |
640 | if (!skb) | |
641 | continue; | |
642 | ||
b604dd98 DH |
643 | sent_at = skb->tstamp; |
644 | smp_rmb(); /* Read timestamp before serial. */ | |
50235c4b DH |
645 | sp = rxrpc_skb(skb); |
646 | if (sp->hdr.serial != orig_serial) | |
647 | continue; | |
50235c4b DH |
648 | goto found; |
649 | } | |
b604dd98 | 650 | |
50235c4b DH |
651 | return; |
652 | ||
653 | found: | |
654 | rxrpc_peer_add_rtt(call, rxrpc_rtt_rx_requested_ack, | |
655 | orig_serial, ack_serial, sent_at, resp_time); | |
656 | } | |
657 | ||
bd1fdf8c DH |
658 | /* |
659 | * Process the response to a ping that we sent to find out if we lost an ACK. | |
660 | * | |
661 | * If we got back a ping response that indicates a lower tx_top than what we | |
662 | * had at the time of the ping transmission, we adjudge all the DATA packets | |
663 | * sent between the response tx_top and the ping-time tx_top to have been lost. | |
664 | */ | |
665 | static void rxrpc_input_check_for_lost_ack(struct rxrpc_call *call) | |
666 | { | |
667 | rxrpc_seq_t top, bottom, seq; | |
668 | bool resend = false; | |
669 | ||
670 | spin_lock_bh(&call->lock); | |
671 | ||
672 | bottom = call->tx_hard_ack + 1; | |
673 | top = call->acks_lost_top; | |
674 | if (before(bottom, top)) { | |
675 | for (seq = bottom; before_eq(seq, top); seq++) { | |
676 | int ix = seq & RXRPC_RXTX_BUFF_MASK; | |
677 | u8 annotation = call->rxtx_annotations[ix]; | |
678 | u8 anno_type = annotation & RXRPC_TX_ANNO_MASK; | |
679 | ||
680 | if (anno_type != RXRPC_TX_ANNO_UNACK) | |
681 | continue; | |
682 | annotation &= ~RXRPC_TX_ANNO_MASK; | |
683 | annotation |= RXRPC_TX_ANNO_RETRANS; | |
684 | call->rxtx_annotations[ix] = annotation; | |
685 | resend = true; | |
686 | } | |
687 | } | |
688 | ||
689 | spin_unlock_bh(&call->lock); | |
690 | ||
691 | if (resend && !test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) | |
692 | rxrpc_queue_call(call); | |
693 | } | |
694 | ||
8e83134d DH |
695 | /* |
696 | * Process a ping response. | |
697 | */ | |
698 | static void rxrpc_input_ping_response(struct rxrpc_call *call, | |
699 | ktime_t resp_time, | |
700 | rxrpc_serial_t orig_serial, | |
701 | rxrpc_serial_t ack_serial) | |
702 | { | |
703 | rxrpc_serial_t ping_serial; | |
704 | ktime_t ping_time; | |
705 | ||
a5af7e1f | 706 | ping_time = call->ping_time; |
8e83134d | 707 | smp_rmb(); |
c1e15b49 | 708 | ping_serial = READ_ONCE(call->ping_serial); |
8e83134d | 709 | |
bd1fdf8c DH |
710 | if (orig_serial == call->acks_lost_ping) |
711 | rxrpc_input_check_for_lost_ack(call); | |
712 | ||
c1e15b49 DH |
713 | if (before(orig_serial, ping_serial) || |
714 | !test_and_clear_bit(RXRPC_CALL_PINGING, &call->flags)) | |
8e83134d | 715 | return; |
8e83134d DH |
716 | if (after(orig_serial, ping_serial)) |
717 | return; | |
718 | ||
719 | rxrpc_peer_add_rtt(call, rxrpc_rtt_rx_ping_response, | |
720 | orig_serial, ack_serial, ping_time, resp_time); | |
721 | } | |
722 | ||
17926a79 | 723 | /* |
248f219c | 724 | * Process the extra information that may be appended to an ACK packet |
17926a79 | 725 | */ |
248f219c DH |
726 | static void rxrpc_input_ackinfo(struct rxrpc_call *call, struct sk_buff *skb, |
727 | struct rxrpc_ackinfo *ackinfo) | |
17926a79 | 728 | { |
248f219c DH |
729 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
730 | struct rxrpc_peer *peer; | |
731 | unsigned int mtu; | |
702f2ac8 | 732 | bool wake = false; |
01fd0742 | 733 | u32 rwind = ntohl(ackinfo->rwind); |
248f219c DH |
734 | |
735 | _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }", | |
736 | sp->hdr.serial, | |
737 | ntohl(ackinfo->rxMTU), ntohl(ackinfo->maxMTU), | |
01fd0742 | 738 | rwind, ntohl(ackinfo->jumbo_max)); |
248f219c | 739 | |
702f2ac8 DH |
740 | if (call->tx_winsize != rwind) { |
741 | if (rwind > RXRPC_RXTX_BUFF_SIZE - 1) | |
742 | rwind = RXRPC_RXTX_BUFF_SIZE - 1; | |
743 | if (rwind > call->tx_winsize) | |
744 | wake = true; | |
740586d2 DH |
745 | trace_rxrpc_rx_rwind_change(call, sp->hdr.serial, |
746 | ntohl(ackinfo->rwind), wake); | |
702f2ac8 DH |
747 | call->tx_winsize = rwind; |
748 | } | |
749 | ||
08511150 DH |
750 | if (call->cong_ssthresh > rwind) |
751 | call->cong_ssthresh = rwind; | |
248f219c DH |
752 | |
753 | mtu = min(ntohl(ackinfo->rxMTU), ntohl(ackinfo->maxMTU)); | |
754 | ||
755 | peer = call->peer; | |
756 | if (mtu < peer->maxdata) { | |
757 | spin_lock_bh(&peer->lock); | |
758 | peer->maxdata = mtu; | |
759 | peer->mtu = mtu + peer->hdrsize; | |
760 | spin_unlock_bh(&peer->lock); | |
761 | _net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata); | |
762 | } | |
702f2ac8 DH |
763 | |
764 | if (wake) | |
765 | wake_up(&call->waitq); | |
248f219c | 766 | } |
17926a79 | 767 | |
248f219c DH |
768 | /* |
769 | * Process individual soft ACKs. | |
770 | * | |
771 | * Each ACK in the array corresponds to one packet and can be either an ACK or | |
772 | * a NAK. If we get find an explicitly NAK'd packet we resend immediately; | |
773 | * packets that lie beyond the end of the ACK list are scheduled for resend by | |
774 | * the timer on the basis that the peer might just not have processed them at | |
775 | * the time the ACK was sent. | |
776 | */ | |
777 | static void rxrpc_input_soft_acks(struct rxrpc_call *call, u8 *acks, | |
31a1b989 DH |
778 | rxrpc_seq_t seq, int nr_acks, |
779 | struct rxrpc_ack_summary *summary) | |
248f219c | 780 | { |
248f219c | 781 | int ix; |
f07373ea | 782 | u8 annotation, anno_type; |
248f219c DH |
783 | |
784 | for (; nr_acks > 0; nr_acks--, seq++) { | |
785 | ix = seq & RXRPC_RXTX_BUFF_MASK; | |
f07373ea DH |
786 | annotation = call->rxtx_annotations[ix]; |
787 | anno_type = annotation & RXRPC_TX_ANNO_MASK; | |
788 | annotation &= ~RXRPC_TX_ANNO_MASK; | |
d01dc4c3 | 789 | switch (*acks++) { |
248f219c | 790 | case RXRPC_ACK_TYPE_ACK: |
31a1b989 | 791 | summary->nr_acks++; |
f07373ea DH |
792 | if (anno_type == RXRPC_TX_ANNO_ACK) |
793 | continue; | |
31a1b989 | 794 | summary->nr_new_acks++; |
f07373ea DH |
795 | call->rxtx_annotations[ix] = |
796 | RXRPC_TX_ANNO_ACK | annotation; | |
248f219c DH |
797 | break; |
798 | case RXRPC_ACK_TYPE_NACK: | |
31a1b989 DH |
799 | if (!summary->nr_nacks && |
800 | call->acks_lowest_nak != seq) { | |
801 | call->acks_lowest_nak = seq; | |
802 | summary->new_low_nack = true; | |
803 | } | |
804 | summary->nr_nacks++; | |
f07373ea | 805 | if (anno_type == RXRPC_TX_ANNO_NAK) |
248f219c | 806 | continue; |
31a1b989 | 807 | summary->nr_new_nacks++; |
be8aa338 DH |
808 | if (anno_type == RXRPC_TX_ANNO_RETRANS) |
809 | continue; | |
f07373ea DH |
810 | call->rxtx_annotations[ix] = |
811 | RXRPC_TX_ANNO_NAK | annotation; | |
248f219c DH |
812 | break; |
813 | default: | |
814 | return rxrpc_proto_abort("SFT", call, 0); | |
17926a79 | 815 | } |
17926a79 DH |
816 | } |
817 | } | |
818 | ||
819 | /* | |
248f219c DH |
820 | * Process an ACK packet. |
821 | * | |
822 | * ack.firstPacket is the sequence number of the first soft-ACK'd/NAK'd packet | |
823 | * in the ACK array. Anything before that is hard-ACK'd and may be discarded. | |
824 | * | |
825 | * A hard-ACK means that a packet has been processed and may be discarded; a | |
826 | * soft-ACK means that the packet may be discarded and retransmission | |
827 | * requested. A phase is complete when all packets are hard-ACK'd. | |
17926a79 | 828 | */ |
248f219c DH |
829 | static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb, |
830 | u16 skew) | |
17926a79 | 831 | { |
31a1b989 | 832 | struct rxrpc_ack_summary summary = { 0 }; |
17926a79 | 833 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
248f219c DH |
834 | union { |
835 | struct rxrpc_ackpacket ack; | |
836 | struct rxrpc_ackinfo info; | |
837 | u8 acks[RXRPC_MAXACKS]; | |
838 | } buf; | |
8e83134d | 839 | rxrpc_serial_t acked_serial; |
1a2391c3 | 840 | rxrpc_seq_t first_soft_ack, hard_ack, prev_pkt; |
775e5b71 | 841 | int nr_acks, offset, ioffset; |
248f219c DH |
842 | |
843 | _enter(""); | |
844 | ||
775e5b71 DH |
845 | offset = sizeof(struct rxrpc_wire_header); |
846 | if (skb_copy_bits(skb, offset, &buf.ack, sizeof(buf.ack)) < 0) { | |
248f219c DH |
847 | _debug("extraction failure"); |
848 | return rxrpc_proto_abort("XAK", call, 0); | |
17926a79 | 849 | } |
775e5b71 | 850 | offset += sizeof(buf.ack); |
248f219c | 851 | |
8e83134d | 852 | acked_serial = ntohl(buf.ack.serial); |
248f219c | 853 | first_soft_ack = ntohl(buf.ack.firstPacket); |
1a2391c3 | 854 | prev_pkt = ntohl(buf.ack.previousPacket); |
248f219c DH |
855 | hard_ack = first_soft_ack - 1; |
856 | nr_acks = buf.ack.nAcks; | |
31a1b989 DH |
857 | summary.ack_reason = (buf.ack.reason < RXRPC_ACK__INVALID ? |
858 | buf.ack.reason : RXRPC_ACK__INVALID); | |
248f219c | 859 | |
b1d9f7fd | 860 | trace_rxrpc_rx_ack(call, sp->hdr.serial, acked_serial, |
1a2391c3 | 861 | first_soft_ack, prev_pkt, |
b1d9f7fd | 862 | summary.ack_reason, nr_acks); |
ec71eb9a | 863 | |
8e83134d DH |
864 | if (buf.ack.reason == RXRPC_ACK_PING_RESPONSE) |
865 | rxrpc_input_ping_response(call, skb->tstamp, acked_serial, | |
866 | sp->hdr.serial); | |
50235c4b DH |
867 | if (buf.ack.reason == RXRPC_ACK_REQUESTED) |
868 | rxrpc_input_requested_ack(call, skb->tstamp, acked_serial, | |
869 | sp->hdr.serial); | |
8e83134d | 870 | |
248f219c DH |
871 | if (buf.ack.reason == RXRPC_ACK_PING) { |
872 | _proto("Rx ACK %%%u PING Request", sp->hdr.serial); | |
873 | rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE, | |
9c7ad434 DH |
874 | skew, sp->hdr.serial, true, true, |
875 | rxrpc_propose_ack_respond_to_ping); | |
248f219c | 876 | } else if (sp->hdr.flags & RXRPC_REQUEST_ACK) { |
563ea7d5 | 877 | rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, |
9c7ad434 DH |
878 | skew, sp->hdr.serial, true, true, |
879 | rxrpc_propose_ack_respond_to_ack); | |
17926a79 DH |
880 | } |
881 | ||
1a2391c3 JA |
882 | /* Discard any out-of-order or duplicate ACKs (outside lock). */ |
883 | if (before(first_soft_ack, call->ackr_first_seq) || | |
884 | before(prev_pkt, call->ackr_prev_seq)) | |
298bc15b | 885 | return; |
c1e15b49 DH |
886 | |
887 | buf.info.rxMTU = 0; | |
775e5b71 | 888 | ioffset = offset + nr_acks + 3; |
c1e15b49 DH |
889 | if (skb->len >= ioffset + sizeof(buf.info) && |
890 | skb_copy_bits(skb, ioffset, &buf.info, sizeof(buf.info)) < 0) | |
891 | return rxrpc_proto_abort("XAI", call, 0); | |
892 | ||
893 | spin_lock(&call->input_lock); | |
894 | ||
1a2391c3 JA |
895 | /* Discard any out-of-order or duplicate ACKs (inside lock). */ |
896 | if (before(first_soft_ack, call->ackr_first_seq) || | |
897 | before(prev_pkt, call->ackr_prev_seq)) | |
c1e15b49 | 898 | goto out; |
298bc15b DH |
899 | call->acks_latest_ts = skb->tstamp; |
900 | call->acks_latest = sp->hdr.serial; | |
901 | ||
1a2391c3 JA |
902 | call->ackr_first_seq = first_soft_ack; |
903 | call->ackr_prev_seq = prev_pkt; | |
904 | ||
298bc15b | 905 | /* Parse rwind and mtu sizes if provided. */ |
c1e15b49 | 906 | if (buf.info.rxMTU) |
248f219c | 907 | rxrpc_input_ackinfo(call, skb, &buf.info); |
17926a79 | 908 | |
c1e15b49 DH |
909 | if (first_soft_ack == 0) { |
910 | rxrpc_proto_abort("AK0", call, 0); | |
911 | goto out; | |
912 | } | |
17926a79 | 913 | |
248f219c | 914 | /* Ignore ACKs unless we are or have just been transmitting. */ |
146d8fef | 915 | switch (READ_ONCE(call->state)) { |
248f219c DH |
916 | case RXRPC_CALL_CLIENT_SEND_REQUEST: |
917 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
918 | case RXRPC_CALL_SERVER_SEND_REPLY: | |
919 | case RXRPC_CALL_SERVER_AWAIT_ACK: | |
920 | break; | |
17926a79 | 921 | default: |
c1e15b49 | 922 | goto out; |
248f219c | 923 | } |
17926a79 | 924 | |
248f219c | 925 | if (before(hard_ack, call->tx_hard_ack) || |
c1e15b49 DH |
926 | after(hard_ack, call->tx_top)) { |
927 | rxrpc_proto_abort("AKW", call, 0); | |
928 | goto out; | |
929 | } | |
930 | if (nr_acks > call->tx_top - hard_ack) { | |
931 | rxrpc_proto_abort("AKN", call, 0); | |
932 | goto out; | |
933 | } | |
17926a79 | 934 | |
c479d5f2 DH |
935 | if (after(hard_ack, call->tx_hard_ack)) { |
936 | if (rxrpc_rotate_tx_window(call, hard_ack, &summary)) { | |
937 | rxrpc_end_tx_phase(call, false, "ETA"); | |
c1e15b49 | 938 | goto out; |
c479d5f2 DH |
939 | } |
940 | } | |
17926a79 | 941 | |
70790dbe | 942 | if (nr_acks > 0) { |
c1e15b49 DH |
943 | if (skb_copy_bits(skb, offset, buf.acks, nr_acks) < 0) { |
944 | rxrpc_proto_abort("XSA", call, 0); | |
945 | goto out; | |
946 | } | |
31a1b989 DH |
947 | rxrpc_input_soft_acks(call, buf.acks, first_soft_ack, nr_acks, |
948 | &summary); | |
70790dbe DH |
949 | } |
950 | ||
0d967960 DH |
951 | if (call->rxtx_annotations[call->tx_top & RXRPC_RXTX_BUFF_MASK] & |
952 | RXRPC_TX_ANNO_LAST && | |
a9f312d9 DH |
953 | summary.nr_acks == call->tx_top - hard_ack && |
954 | rxrpc_is_client_call(call)) | |
0d967960 DH |
955 | rxrpc_propose_ACK(call, RXRPC_ACK_PING, skew, sp->hdr.serial, |
956 | false, true, | |
957 | rxrpc_propose_ack_ping_for_lost_reply); | |
57494343 | 958 | |
c1e15b49 DH |
959 | rxrpc_congestion_management(call, skb, &summary, acked_serial); |
960 | out: | |
961 | spin_unlock(&call->input_lock); | |
17926a79 DH |
962 | } |
963 | ||
964 | /* | |
248f219c | 965 | * Process an ACKALL packet. |
17926a79 | 966 | */ |
248f219c | 967 | static void rxrpc_input_ackall(struct rxrpc_call *call, struct sk_buff *skb) |
17926a79 | 968 | { |
31a1b989 | 969 | struct rxrpc_ack_summary summary = { 0 }; |
248f219c | 970 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
17926a79 | 971 | |
248f219c | 972 | _proto("Rx ACKALL %%%u", sp->hdr.serial); |
17926a79 | 973 | |
c1e15b49 DH |
974 | spin_lock(&call->input_lock); |
975 | ||
c479d5f2 | 976 | if (rxrpc_rotate_tx_window(call, call->tx_top, &summary)) |
70790dbe | 977 | rxrpc_end_tx_phase(call, false, "ETL"); |
c1e15b49 DH |
978 | |
979 | spin_unlock(&call->input_lock); | |
248f219c | 980 | } |
17926a79 | 981 | |
248f219c | 982 | /* |
005ede28 | 983 | * Process an ABORT packet directed at a call. |
248f219c DH |
984 | */ |
985 | static void rxrpc_input_abort(struct rxrpc_call *call, struct sk_buff *skb) | |
986 | { | |
987 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
988 | __be32 wtmp; | |
989 | u32 abort_code = RX_CALL_DEAD; | |
17926a79 | 990 | |
248f219c | 991 | _enter(""); |
17926a79 | 992 | |
248f219c | 993 | if (skb->len >= 4 && |
775e5b71 DH |
994 | skb_copy_bits(skb, sizeof(struct rxrpc_wire_header), |
995 | &wtmp, sizeof(wtmp)) >= 0) | |
248f219c | 996 | abort_code = ntohl(wtmp); |
17926a79 | 997 | |
005ede28 DH |
998 | trace_rxrpc_rx_abort(call, sp->hdr.serial, abort_code); |
999 | ||
248f219c | 1000 | _proto("Rx ABORT %%%u { %x }", sp->hdr.serial, abort_code); |
17926a79 | 1001 | |
248f219c | 1002 | if (rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED, |
3a92789a | 1003 | abort_code, -ECONNABORTED)) |
248f219c | 1004 | rxrpc_notify_socket(call); |
17926a79 DH |
1005 | } |
1006 | ||
1007 | /* | |
248f219c | 1008 | * Process an incoming call packet. |
17926a79 | 1009 | */ |
248f219c DH |
1010 | static void rxrpc_input_call_packet(struct rxrpc_call *call, |
1011 | struct sk_buff *skb, u16 skew) | |
17926a79 | 1012 | { |
248f219c | 1013 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
a158bdd3 | 1014 | unsigned long timo; |
17926a79 | 1015 | |
7727640c | 1016 | _enter("%p,%p", call, skb); |
17926a79 | 1017 | |
a158bdd3 DH |
1018 | timo = READ_ONCE(call->next_rx_timo); |
1019 | if (timo) { | |
1020 | unsigned long now = jiffies, expect_rx_by; | |
1021 | ||
c54e43d7 | 1022 | expect_rx_by = now + timo; |
a158bdd3 DH |
1023 | WRITE_ONCE(call->expect_rx_by, expect_rx_by); |
1024 | rxrpc_reduce_call_timer(call, expect_rx_by, now, | |
1025 | rxrpc_timer_set_for_normal); | |
1026 | } | |
3d7682af | 1027 | |
248f219c DH |
1028 | switch (sp->hdr.type) { |
1029 | case RXRPC_PACKET_TYPE_DATA: | |
1030 | rxrpc_input_data(call, skb, skew); | |
1031 | break; | |
f5c17aae | 1032 | |
248f219c DH |
1033 | case RXRPC_PACKET_TYPE_ACK: |
1034 | rxrpc_input_ack(call, skb, skew); | |
17926a79 | 1035 | break; |
17926a79 | 1036 | |
248f219c DH |
1037 | case RXRPC_PACKET_TYPE_BUSY: |
1038 | _proto("Rx BUSY %%%u", sp->hdr.serial); | |
17926a79 | 1039 | |
248f219c DH |
1040 | /* Just ignore BUSY packets from the server; the retry and |
1041 | * lifespan timers will take care of business. BUSY packets | |
1042 | * from the client don't make sense. | |
1043 | */ | |
1044 | break; | |
17926a79 | 1045 | |
248f219c DH |
1046 | case RXRPC_PACKET_TYPE_ABORT: |
1047 | rxrpc_input_abort(call, skb); | |
1048 | break; | |
17926a79 | 1049 | |
248f219c DH |
1050 | case RXRPC_PACKET_TYPE_ACKALL: |
1051 | rxrpc_input_ackall(call, skb); | |
1052 | break; | |
f5c17aae | 1053 | |
248f219c | 1054 | default: |
248f219c | 1055 | break; |
17926a79 | 1056 | } |
248f219c | 1057 | |
17926a79 DH |
1058 | _leave(""); |
1059 | } | |
1060 | ||
b3156274 | 1061 | /* |
c1e15b49 DH |
1062 | * Handle a new service call on a channel implicitly completing the preceding |
1063 | * call on that channel. This does not apply to client conns. | |
b3156274 DH |
1064 | * |
1065 | * TODO: If callNumber > call_id + 1, renegotiate security. | |
1066 | */ | |
c1e15b49 DH |
1067 | static void rxrpc_input_implicit_end_call(struct rxrpc_sock *rx, |
1068 | struct rxrpc_connection *conn, | |
b3156274 DH |
1069 | struct rxrpc_call *call) |
1070 | { | |
146d8fef | 1071 | switch (READ_ONCE(call->state)) { |
b3156274 DH |
1072 | case RXRPC_CALL_SERVER_AWAIT_ACK: |
1073 | rxrpc_call_completed(call); | |
c1e15b49 | 1074 | /* Fall through */ |
b3156274 DH |
1075 | case RXRPC_CALL_COMPLETE: |
1076 | break; | |
1077 | default: | |
3a92789a | 1078 | if (rxrpc_abort_call("IMP", call, 0, RX_CALL_DEAD, -ESHUTDOWN)) { |
b3156274 DH |
1079 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
1080 | rxrpc_queue_call(call); | |
1081 | } | |
c1e15b49 | 1082 | trace_rxrpc_improper_term(call); |
b3156274 DH |
1083 | break; |
1084 | } | |
1085 | ||
c1e15b49 | 1086 | spin_lock(&rx->incoming_lock); |
b3156274 | 1087 | __rxrpc_disconnect_call(conn, call); |
c1e15b49 | 1088 | spin_unlock(&rx->incoming_lock); |
b3156274 DH |
1089 | rxrpc_notify_socket(call); |
1090 | } | |
1091 | ||
17926a79 DH |
1092 | /* |
1093 | * post connection-level events to the connection | |
18bfeba5 DH |
1094 | * - this includes challenges, responses, some aborts and call terminal packet |
1095 | * retransmission. | |
17926a79 | 1096 | */ |
2e7e9758 | 1097 | static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn, |
17926a79 DH |
1098 | struct sk_buff *skb) |
1099 | { | |
1100 | _enter("%p,%p", conn, skb); | |
1101 | ||
17926a79 | 1102 | skb_queue_tail(&conn->rx_queue, skb); |
2e7e9758 | 1103 | rxrpc_queue_conn(conn); |
17926a79 DH |
1104 | } |
1105 | ||
44ba0698 DH |
1106 | /* |
1107 | * post endpoint-level events to the local endpoint | |
1108 | * - this includes debug and version messages | |
1109 | */ | |
1110 | static void rxrpc_post_packet_to_local(struct rxrpc_local *local, | |
1111 | struct sk_buff *skb) | |
1112 | { | |
1113 | _enter("%p,%p", local, skb); | |
1114 | ||
44ba0698 | 1115 | skb_queue_tail(&local->event_queue, skb); |
5acbee46 | 1116 | rxrpc_queue_local(local); |
44ba0698 DH |
1117 | } |
1118 | ||
248f219c DH |
1119 | /* |
1120 | * put a packet up for transport-level abort | |
1121 | */ | |
1122 | static void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb) | |
1123 | { | |
1124 | CHECK_SLAB_OKAY(&local->usage); | |
1125 | ||
1126 | skb_queue_tail(&local->reject_queue, skb); | |
1127 | rxrpc_queue_local(local); | |
1128 | } | |
1129 | ||
0d12f8a4 DH |
1130 | /* |
1131 | * Extract the wire header from a packet and translate the byte order. | |
1132 | */ | |
1133 | static noinline | |
1134 | int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb) | |
1135 | { | |
1136 | struct rxrpc_wire_header whdr; | |
1137 | ||
1138 | /* dig out the RxRPC connection details */ | |
fb46f6ee DH |
1139 | if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0) { |
1140 | trace_rxrpc_rx_eproto(NULL, sp->hdr.serial, | |
1141 | tracepoint_string("bad_hdr")); | |
0d12f8a4 | 1142 | return -EBADMSG; |
fb46f6ee | 1143 | } |
0d12f8a4 DH |
1144 | |
1145 | memset(sp, 0, sizeof(*sp)); | |
1146 | sp->hdr.epoch = ntohl(whdr.epoch); | |
1147 | sp->hdr.cid = ntohl(whdr.cid); | |
1148 | sp->hdr.callNumber = ntohl(whdr.callNumber); | |
1149 | sp->hdr.seq = ntohl(whdr.seq); | |
1150 | sp->hdr.serial = ntohl(whdr.serial); | |
1151 | sp->hdr.flags = whdr.flags; | |
1152 | sp->hdr.type = whdr.type; | |
1153 | sp->hdr.userStatus = whdr.userStatus; | |
1154 | sp->hdr.securityIndex = whdr.securityIndex; | |
1155 | sp->hdr._rsvd = ntohs(whdr._rsvd); | |
1156 | sp->hdr.serviceId = ntohs(whdr.serviceId); | |
1157 | return 0; | |
1158 | } | |
1159 | ||
17926a79 DH |
1160 | /* |
1161 | * handle data received on the local endpoint | |
1162 | * - may be called in interrupt context | |
4f95dd78 | 1163 | * |
032be5f1 ED |
1164 | * [!] Note that as this is called from the encap_rcv hook, the socket is not |
1165 | * held locked by the caller and nothing prevents sk_user_data on the UDP from | |
1166 | * being cleared in the middle of processing this function. | |
bfd28211 DH |
1167 | * |
1168 | * Called with the RCU read lock held from the IP layer via UDP. | |
17926a79 | 1169 | */ |
5271953c | 1170 | int rxrpc_input_packet(struct sock *udp_sk, struct sk_buff *skb) |
17926a79 | 1171 | { |
032be5f1 | 1172 | struct rxrpc_local *local = rcu_dereference_sk_user_data(udp_sk); |
8496af50 | 1173 | struct rxrpc_connection *conn; |
248f219c | 1174 | struct rxrpc_channel *chan; |
403fc2a1 | 1175 | struct rxrpc_call *call = NULL; |
17926a79 | 1176 | struct rxrpc_skb_priv *sp; |
0099dc58 DH |
1177 | struct rxrpc_peer *peer = NULL; |
1178 | struct rxrpc_sock *rx = NULL; | |
248f219c | 1179 | unsigned int channel; |
2cfa2271 | 1180 | int skew = 0; |
17926a79 | 1181 | |
248f219c | 1182 | _enter("%p", udp_sk); |
17926a79 | 1183 | |
032be5f1 ED |
1184 | if (unlikely(!local)) { |
1185 | kfree_skb(skb); | |
1186 | return 0; | |
1187 | } | |
b604dd98 DH |
1188 | if (skb->tstamp == 0) |
1189 | skb->tstamp = ktime_get_real(); | |
1190 | ||
71f3ca40 | 1191 | rxrpc_new_skb(skb, rxrpc_skb_rx_received); |
17926a79 | 1192 | |
5271953c | 1193 | skb_pull(skb, sizeof(struct udphdr)); |
1781f7f5 | 1194 | |
7c13f97f PA |
1195 | /* The UDP protocol already released all skb resources; |
1196 | * we are free to add our own data there. | |
0d12f8a4 | 1197 | */ |
17926a79 | 1198 | sp = rxrpc_skb(skb); |
17926a79 | 1199 | |
89b475ab DH |
1200 | /* dig out the RxRPC connection details */ |
1201 | if (rxrpc_extract_header(sp, skb) < 0) | |
1202 | goto bad_message; | |
1203 | ||
8a681c36 DH |
1204 | if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) { |
1205 | static int lose; | |
1206 | if ((lose++ & 7) == 7) { | |
89b475ab | 1207 | trace_rxrpc_rx_lose(sp); |
d2944b1c | 1208 | rxrpc_free_skb(skb, rxrpc_skb_rx_lost); |
5271953c | 1209 | return 0; |
8a681c36 DH |
1210 | } |
1211 | } | |
1212 | ||
2cfa2271 DH |
1213 | if (skb->tstamp == 0) |
1214 | skb->tstamp = ktime_get_real(); | |
49e19ec7 | 1215 | trace_rxrpc_rx_packet(sp); |
17926a79 | 1216 | |
248f219c DH |
1217 | switch (sp->hdr.type) { |
1218 | case RXRPC_PACKET_TYPE_VERSION: | |
dc71db34 | 1219 | if (rxrpc_to_client(sp)) |
ace45bec | 1220 | goto discard; |
44ba0698 DH |
1221 | rxrpc_post_packet_to_local(local, skb); |
1222 | goto out; | |
bc6e1ea3 | 1223 | |
248f219c | 1224 | case RXRPC_PACKET_TYPE_BUSY: |
dc71db34 | 1225 | if (rxrpc_to_server(sp)) |
248f219c | 1226 | goto discard; |
e3cf3970 | 1227 | /* Fall through */ |
403fc2a1 DH |
1228 | case RXRPC_PACKET_TYPE_ACK: |
1229 | case RXRPC_PACKET_TYPE_ACKALL: | |
1230 | if (sp->hdr.callNumber == 0) | |
1231 | goto bad_message; | |
1232 | /* Fall through */ | |
1233 | case RXRPC_PACKET_TYPE_ABORT: | |
1234 | break; | |
248f219c DH |
1235 | |
1236 | case RXRPC_PACKET_TYPE_DATA: | |
403fc2a1 DH |
1237 | if (sp->hdr.callNumber == 0 || |
1238 | sp->hdr.seq == 0) | |
248f219c DH |
1239 | goto bad_message; |
1240 | if (sp->hdr.flags & RXRPC_JUMBO_PACKET && | |
1241 | !rxrpc_validate_jumbo(skb)) | |
1242 | goto bad_message; | |
1243 | break; | |
b41d7cfe | 1244 | |
403fc2a1 DH |
1245 | case RXRPC_PACKET_TYPE_CHALLENGE: |
1246 | if (rxrpc_to_server(sp)) | |
1247 | goto discard; | |
1248 | break; | |
1249 | case RXRPC_PACKET_TYPE_RESPONSE: | |
1250 | if (rxrpc_to_client(sp)) | |
1251 | goto discard; | |
1252 | break; | |
1253 | ||
b41d7cfe DH |
1254 | /* Packet types 9-11 should just be ignored. */ |
1255 | case RXRPC_PACKET_TYPE_PARAMS: | |
1256 | case RXRPC_PACKET_TYPE_10: | |
1257 | case RXRPC_PACKET_TYPE_11: | |
1258 | goto discard; | |
403fc2a1 DH |
1259 | |
1260 | default: | |
1261 | _proto("Rx Bad Packet Type %u", sp->hdr.type); | |
1262 | goto bad_message; | |
248f219c | 1263 | } |
17926a79 | 1264 | |
403fc2a1 DH |
1265 | if (sp->hdr.serviceId == 0) |
1266 | goto bad_message; | |
1267 | ||
403fc2a1 DH |
1268 | if (rxrpc_to_server(sp)) { |
1269 | /* Weed out packets to services we're not offering. Packets | |
1270 | * that would begin a call are explicitly rejected and the rest | |
1271 | * are just discarded. | |
1272 | */ | |
1273 | rx = rcu_dereference(local->service); | |
1274 | if (!rx || (sp->hdr.serviceId != rx->srx.srx_service && | |
1275 | sp->hdr.serviceId != rx->second_service)) { | |
1276 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && | |
1277 | sp->hdr.seq == 1) | |
1278 | goto unsupported_service; | |
bfd28211 | 1279 | goto discard; |
403fc2a1 DH |
1280 | } |
1281 | } | |
1282 | ||
0099dc58 | 1283 | conn = rxrpc_find_connection_rcu(local, skb, &peer); |
248f219c DH |
1284 | if (conn) { |
1285 | if (sp->hdr.securityIndex != conn->security_ix) | |
1286 | goto wrong_security; | |
563ea7d5 | 1287 | |
4e255721 | 1288 | if (sp->hdr.serviceId != conn->service_id) { |
c1e15b49 DH |
1289 | int old_id; |
1290 | ||
1291 | if (!test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags)) | |
1292 | goto reupgrade; | |
1293 | old_id = cmpxchg(&conn->service_id, conn->params.service_id, | |
1294 | sp->hdr.serviceId); | |
1295 | ||
1296 | if (old_id != conn->params.service_id && | |
1297 | old_id != sp->hdr.serviceId) | |
4e255721 | 1298 | goto reupgrade; |
4e255721 | 1299 | } |
3d7682af | 1300 | |
248f219c DH |
1301 | if (sp->hdr.callNumber == 0) { |
1302 | /* Connection-level packet */ | |
1303 | _debug("CONN %p {%d}", conn, conn->debug_id); | |
1304 | rxrpc_post_packet_to_conn(conn, skb); | |
bfd28211 | 1305 | goto out; |
248f219c DH |
1306 | } |
1307 | ||
1308 | /* Note the serial number skew here */ | |
1309 | skew = (int)sp->hdr.serial - (int)conn->hi_serial; | |
1310 | if (skew >= 0) { | |
1311 | if (skew > 0) | |
1312 | conn->hi_serial = sp->hdr.serial; | |
1313 | } else { | |
1314 | skew = -skew; | |
1315 | skew = min(skew, 65535); | |
1316 | } | |
17926a79 | 1317 | |
8496af50 | 1318 | /* Call-bound packets are routed by connection channel. */ |
248f219c DH |
1319 | channel = sp->hdr.cid & RXRPC_CHANNELMASK; |
1320 | chan = &conn->channels[channel]; | |
18bfeba5 DH |
1321 | |
1322 | /* Ignore really old calls */ | |
1323 | if (sp->hdr.callNumber < chan->last_call) | |
bfd28211 | 1324 | goto discard; |
18bfeba5 DH |
1325 | |
1326 | if (sp->hdr.callNumber == chan->last_call) { | |
57b0c9d4 DH |
1327 | if (chan->call || |
1328 | sp->hdr.type == RXRPC_PACKET_TYPE_ABORT) | |
bfd28211 | 1329 | goto discard; |
57b0c9d4 DH |
1330 | |
1331 | /* For the previous service call, if completed | |
1332 | * successfully, we discard all further packets. | |
18bfeba5 | 1333 | */ |
2266ffde | 1334 | if (rxrpc_conn_is_service(conn) && |
57b0c9d4 | 1335 | chan->last_type == RXRPC_PACKET_TYPE_ACK) |
bfd28211 | 1336 | goto discard; |
18bfeba5 | 1337 | |
57b0c9d4 DH |
1338 | /* But otherwise we need to retransmit the final packet |
1339 | * from data cached in the connection record. | |
18bfeba5 | 1340 | */ |
4764c0da DH |
1341 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) |
1342 | trace_rxrpc_rx_data(chan->call_debug_id, | |
1343 | sp->hdr.seq, | |
1344 | sp->hdr.serial, | |
1345 | sp->hdr.flags, 0); | |
18bfeba5 | 1346 | rxrpc_post_packet_to_conn(conn, skb); |
bfd28211 | 1347 | goto out; |
18bfeba5 | 1348 | } |
0d12f8a4 | 1349 | |
18bfeba5 | 1350 | call = rcu_dereference(chan->call); |
b3156274 DH |
1351 | |
1352 | if (sp->hdr.callNumber > chan->call_id) { | |
bfd28211 | 1353 | if (rxrpc_to_client(sp)) |
b3156274 | 1354 | goto reject_packet; |
b3156274 | 1355 | if (call) |
c1e15b49 | 1356 | rxrpc_input_implicit_end_call(rx, conn, call); |
b3156274 DH |
1357 | call = NULL; |
1358 | } | |
4e255721 | 1359 | |
1a025028 DH |
1360 | if (call) { |
1361 | if (sp->hdr.serviceId != call->service_id) | |
1362 | call->service_id = sp->hdr.serviceId; | |
1363 | if ((int)sp->hdr.serial - (int)call->rx_serial > 0) | |
1364 | call->rx_serial = sp->hdr.serial; | |
1365 | if (!test_bit(RXRPC_CALL_RX_HEARD, &call->flags)) | |
1366 | set_bit(RXRPC_CALL_RX_HEARD, &call->flags); | |
1367 | } | |
248f219c | 1368 | } |
8496af50 | 1369 | |
248f219c | 1370 | if (!call || atomic_read(&call->usage) == 0) { |
dc71db34 | 1371 | if (rxrpc_to_client(sp) || |
248f219c | 1372 | sp->hdr.type != RXRPC_PACKET_TYPE_DATA) |
bfd28211 | 1373 | goto bad_message; |
248f219c | 1374 | if (sp->hdr.seq != 1) |
bfd28211 | 1375 | goto discard; |
c1e15b49 | 1376 | call = rxrpc_new_incoming_call(local, rx, skb); |
bfd28211 | 1377 | if (!call) |
248f219c | 1378 | goto reject_packet; |
8e83134d | 1379 | rxrpc_send_ping(call, skb, skew); |
540b1c48 | 1380 | mutex_unlock(&call->user_mutex); |
7727640c | 1381 | } |
44ba0698 | 1382 | |
248f219c | 1383 | rxrpc_input_call_packet(call, skb, skew); |
bfd28211 | 1384 | goto discard; |
248f219c | 1385 | |
248f219c | 1386 | discard: |
71f3ca40 | 1387 | rxrpc_free_skb(skb, rxrpc_skb_rx_freed); |
44ba0698 | 1388 | out: |
49e19ec7 | 1389 | trace_rxrpc_rx_done(0, 0); |
5271953c | 1390 | return 0; |
8496af50 | 1391 | |
248f219c | 1392 | wrong_security: |
a25e21f0 | 1393 | trace_rxrpc_abort(0, "SEC", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, |
248f219c DH |
1394 | RXKADINCONSISTENCY, EBADMSG); |
1395 | skb->priority = RXKADINCONSISTENCY; | |
1396 | goto post_abort; | |
17926a79 | 1397 | |
403fc2a1 | 1398 | unsupported_service: |
403fc2a1 DH |
1399 | trace_rxrpc_abort(0, "INV", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, |
1400 | RX_INVALID_OPERATION, EOPNOTSUPP); | |
1401 | skb->priority = RX_INVALID_OPERATION; | |
1402 | goto post_abort; | |
1403 | ||
4e255721 | 1404 | reupgrade: |
a25e21f0 | 1405 | trace_rxrpc_abort(0, "UPG", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, |
4e255721 DH |
1406 | RX_PROTOCOL_ERROR, EBADMSG); |
1407 | goto protocol_error; | |
1408 | ||
17926a79 | 1409 | bad_message: |
a25e21f0 | 1410 | trace_rxrpc_abort(0, "BAD", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, |
248f219c | 1411 | RX_PROTOCOL_ERROR, EBADMSG); |
4e255721 | 1412 | protocol_error: |
17926a79 | 1413 | skb->priority = RX_PROTOCOL_ERROR; |
248f219c | 1414 | post_abort: |
ece64fec | 1415 | skb->mark = RXRPC_SKB_MARK_REJECT_ABORT; |
49e19ec7 DH |
1416 | reject_packet: |
1417 | trace_rxrpc_rx_done(skb->mark, skb->priority); | |
17926a79 | 1418 | rxrpc_reject_packet(local, skb); |
17926a79 | 1419 | _leave(" [badmsg]"); |
5271953c | 1420 | return 0; |
17926a79 | 1421 | } |