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 | */ |
9a6d4570 | 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; |
9a6d4570 | 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 | |
9a6d4570 | 247 | if (annotation & RXRPC_TX_ANNO_LAST) { |
70790dbe | 248 | set_bit(RXRPC_CALL_TX_LAST, &call->flags); |
9a6d4570 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 | |
9a6d4570 | 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; | |
265 | skb->next = NULL; | |
71f3ca40 | 266 | rxrpc_free_skb(skb, rxrpc_skb_tx_freed); |
17926a79 | 267 | } |
9a6d4570 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 | { |
17926a79 | 281 | |
70790dbe | 282 | ASSERT(test_bit(RXRPC_CALL_TX_LAST, &call->flags)); |
17926a79 | 283 | |
248f219c | 284 | write_lock(&call->state_lock); |
651350d1 | 285 | |
248f219c | 286 | switch (call->state) { |
70790dbe | 287 | case RXRPC_CALL_CLIENT_SEND_REQUEST: |
248f219c | 288 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: |
70790dbe DH |
289 | if (reply_begun) |
290 | call->state = RXRPC_CALL_CLIENT_RECV_REPLY; | |
291 | else | |
292 | call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY; | |
248f219c | 293 | break; |
70790dbe | 294 | |
248f219c DH |
295 | case RXRPC_CALL_SERVER_AWAIT_ACK: |
296 | __rxrpc_call_completed(call); | |
297 | rxrpc_notify_socket(call); | |
298 | break; | |
70790dbe DH |
299 | |
300 | default: | |
301 | goto bad_state; | |
17926a79 | 302 | } |
17926a79 | 303 | |
248f219c | 304 | write_unlock(&call->state_lock); |
70790dbe | 305 | if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY) { |
0d967960 DH |
306 | rxrpc_propose_ACK(call, RXRPC_ACK_IDLE, 0, 0, false, true, |
307 | rxrpc_propose_ack_client_tx_end); | |
70790dbe DH |
308 | trace_rxrpc_transmit(call, rxrpc_transmit_await_reply); |
309 | } else { | |
310 | trace_rxrpc_transmit(call, rxrpc_transmit_end); | |
311 | } | |
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 }; |
70790dbe DH |
328 | rxrpc_seq_t top = READ_ONCE(call->tx_top); |
329 | ||
dd7c1ee5 DH |
330 | if (call->ackr_reason) { |
331 | spin_lock_bh(&call->lock); | |
332 | call->ackr_reason = 0; | |
333 | call->resend_at = call->expire_at; | |
334 | call->ack_at = call->expire_at; | |
335 | spin_unlock_bh(&call->lock); | |
df0adc78 DH |
336 | rxrpc_set_timer(call, rxrpc_timer_init_for_reply, |
337 | ktime_get_real()); | |
dd7c1ee5 DH |
338 | } |
339 | ||
70790dbe | 340 | if (!test_bit(RXRPC_CALL_TX_LAST, &call->flags)) { |
9a6d4570 DH |
341 | if (!rxrpc_rotate_tx_window(call, top, &summary)) { |
342 | rxrpc_proto_abort("TXL", call, top); | |
343 | return false; | |
344 | } | |
70790dbe DH |
345 | } |
346 | if (!rxrpc_end_tx_phase(call, true, "ETD")) | |
347 | return false; | |
348 | call->tx_phase = false; | |
349 | return true; | |
248f219c DH |
350 | } |
351 | ||
352 | /* | |
353 | * Scan a jumbo packet to validate its structure and to work out how many | |
354 | * subpackets it contains. | |
355 | * | |
356 | * A jumbo packet is a collection of consecutive packets glued together with | |
357 | * little headers between that indicate how to change the initial header for | |
358 | * each subpacket. | |
359 | * | |
360 | * RXRPC_JUMBO_PACKET must be set on all but the last subpacket - and all but | |
361 | * the last are RXRPC_JUMBO_DATALEN in size. The last subpacket may be of any | |
362 | * size. | |
363 | */ | |
364 | static bool rxrpc_validate_jumbo(struct sk_buff *skb) | |
365 | { | |
366 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
775e5b71 | 367 | unsigned int offset = sizeof(struct rxrpc_wire_header); |
89a80ed4 | 368 | unsigned int len = skb->len; |
248f219c DH |
369 | int nr_jumbo = 1; |
370 | u8 flags = sp->hdr.flags; | |
371 | ||
372 | do { | |
373 | nr_jumbo++; | |
374 | if (len - offset < RXRPC_JUMBO_SUBPKTLEN) | |
375 | goto protocol_error; | |
376 | if (flags & RXRPC_LAST_PACKET) | |
377 | goto protocol_error; | |
378 | offset += RXRPC_JUMBO_DATALEN; | |
379 | if (skb_copy_bits(skb, offset, &flags, 1) < 0) | |
380 | goto protocol_error; | |
381 | offset += sizeof(struct rxrpc_jumbo_header); | |
382 | } while (flags & RXRPC_JUMBO_PACKET); | |
383 | ||
384 | sp->nr_jumbo = nr_jumbo; | |
385 | return true; | |
17926a79 | 386 | |
248f219c DH |
387 | protocol_error: |
388 | return false; | |
17926a79 DH |
389 | } |
390 | ||
391 | /* | |
248f219c DH |
392 | * Handle reception of a duplicate packet. |
393 | * | |
394 | * We have to take care to avoid an attack here whereby we're given a series of | |
395 | * jumbograms, each with a sequence number one before the preceding one and | |
396 | * filled up to maximum UDP size. If they never send us the first packet in | |
397 | * the sequence, they can cause us to have to hold on to around 2MiB of kernel | |
398 | * space until the call times out. | |
399 | * | |
400 | * We limit the space usage by only accepting three duplicate jumbo packets per | |
401 | * call. After that, we tell the other side we're no longer accepting jumbos | |
402 | * (that information is encoded in the ACK packet). | |
17926a79 | 403 | */ |
248f219c | 404 | static void rxrpc_input_dup_data(struct rxrpc_call *call, rxrpc_seq_t seq, |
75e42126 | 405 | u8 annotation, bool *_jumbo_bad) |
17926a79 | 406 | { |
248f219c DH |
407 | /* Discard normal packets that are duplicates. */ |
408 | if (annotation == 0) | |
409 | return; | |
17926a79 | 410 | |
248f219c DH |
411 | /* Skip jumbo subpackets that are duplicates. When we've had three or |
412 | * more partially duplicate jumbo packets, we refuse to take any more | |
413 | * jumbos for this call. | |
414 | */ | |
75e42126 DH |
415 | if (!*_jumbo_bad) { |
416 | call->nr_jumbo_bad++; | |
417 | *_jumbo_bad = true; | |
248f219c DH |
418 | } |
419 | } | |
17926a79 | 420 | |
248f219c DH |
421 | /* |
422 | * Process a DATA packet, adding the packet to the Rx ring. | |
423 | */ | |
424 | static void rxrpc_input_data(struct rxrpc_call *call, struct sk_buff *skb, | |
425 | u16 skew) | |
426 | { | |
427 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
146d8fef | 428 | enum rxrpc_call_state state; |
775e5b71 | 429 | unsigned int offset = sizeof(struct rxrpc_wire_header); |
248f219c DH |
430 | unsigned int ix; |
431 | rxrpc_serial_t serial = sp->hdr.serial, ack_serial = 0; | |
432 | rxrpc_seq_t seq = sp->hdr.seq, hard_ack; | |
75e42126 | 433 | bool immediate_ack = false, jumbo_bad = false, queued; |
248f219c DH |
434 | u16 len; |
435 | u8 ack = 0, flags, annotation = 0; | |
17926a79 | 436 | |
248f219c | 437 | _enter("{%u,%u},{%u,%u}", |
89a80ed4 | 438 | call->rx_hard_ack, call->rx_top, skb->len, seq); |
17926a79 | 439 | |
248f219c DH |
440 | _proto("Rx DATA %%%u { #%u f=%02x }", |
441 | sp->hdr.serial, seq, sp->hdr.flags); | |
17926a79 | 442 | |
146d8fef DH |
443 | state = READ_ONCE(call->state); |
444 | if (state >= RXRPC_CALL_COMPLETE) | |
248f219c | 445 | return; |
17926a79 | 446 | |
248f219c DH |
447 | /* Received data implicitly ACKs all of the request packets we sent |
448 | * when we're acting as a client. | |
449 | */ | |
146d8fef DH |
450 | if ((state == RXRPC_CALL_CLIENT_SEND_REQUEST || |
451 | state == RXRPC_CALL_CLIENT_AWAIT_REPLY) && | |
70790dbe | 452 | !rxrpc_receiving_reply(call)) |
248f219c | 453 | return; |
17926a79 | 454 | |
248f219c | 455 | call->ackr_prev_seq = seq; |
17926a79 | 456 | |
248f219c DH |
457 | hard_ack = READ_ONCE(call->rx_hard_ack); |
458 | if (after(seq, hard_ack + call->rx_winsize)) { | |
17926a79 | 459 | ack = RXRPC_ACK_EXCEEDS_WINDOW; |
248f219c DH |
460 | ack_serial = serial; |
461 | goto ack; | |
17926a79 DH |
462 | } |
463 | ||
248f219c DH |
464 | flags = sp->hdr.flags; |
465 | if (flags & RXRPC_JUMBO_PACKET) { | |
75e42126 | 466 | if (call->nr_jumbo_bad > 3) { |
248f219c DH |
467 | ack = RXRPC_ACK_NOSPACE; |
468 | ack_serial = serial; | |
469 | goto ack; | |
17926a79 | 470 | } |
248f219c | 471 | annotation = 1; |
17926a79 DH |
472 | } |
473 | ||
248f219c DH |
474 | next_subpacket: |
475 | queued = false; | |
476 | ix = seq & RXRPC_RXTX_BUFF_MASK; | |
89a80ed4 | 477 | len = skb->len; |
248f219c DH |
478 | if (flags & RXRPC_JUMBO_PACKET) |
479 | len = RXRPC_JUMBO_DATALEN; | |
480 | ||
481 | if (flags & RXRPC_LAST_PACKET) { | |
816c9fce | 482 | if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) && |
248f219c DH |
483 | seq != call->rx_top) |
484 | return rxrpc_proto_abort("LSN", call, seq); | |
485 | } else { | |
486 | if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) && | |
487 | after_eq(seq, call->rx_top)) | |
488 | return rxrpc_proto_abort("LSA", call, seq); | |
17926a79 DH |
489 | } |
490 | ||
b1d9f7fd | 491 | trace_rxrpc_rx_data(call, seq, serial, flags, annotation); |
248f219c DH |
492 | if (before_eq(seq, hard_ack)) { |
493 | ack = RXRPC_ACK_DUPLICATE; | |
494 | ack_serial = serial; | |
495 | goto skip; | |
496 | } | |
497 | ||
498 | if (flags & RXRPC_REQUEST_ACK && !ack) { | |
499 | ack = RXRPC_ACK_REQUESTED; | |
500 | ack_serial = serial; | |
501 | } | |
502 | ||
503 | if (call->rxtx_buffer[ix]) { | |
75e42126 | 504 | rxrpc_input_dup_data(call, seq, annotation, &jumbo_bad); |
248f219c DH |
505 | if (ack != RXRPC_ACK_DUPLICATE) { |
506 | ack = RXRPC_ACK_DUPLICATE; | |
507 | ack_serial = serial; | |
17926a79 | 508 | } |
248f219c DH |
509 | immediate_ack = true; |
510 | goto skip; | |
17926a79 DH |
511 | } |
512 | ||
248f219c DH |
513 | /* Queue the packet. We use a couple of memory barriers here as need |
514 | * to make sure that rx_top is perceived to be set after the buffer | |
515 | * pointer and that the buffer pointer is set after the annotation and | |
516 | * the skb data. | |
517 | * | |
518 | * Barriers against rxrpc_recvmsg_data() and rxrpc_rotate_rx_window() | |
519 | * and also rxrpc_fill_out_ack(). | |
520 | */ | |
71f3ca40 | 521 | rxrpc_get_skb(skb, rxrpc_skb_rx_got); |
248f219c DH |
522 | call->rxtx_annotations[ix] = annotation; |
523 | smp_wmb(); | |
524 | call->rxtx_buffer[ix] = skb; | |
a7056c5b | 525 | if (after(seq, call->rx_top)) { |
248f219c | 526 | smp_store_release(&call->rx_top, seq); |
a7056c5b DH |
527 | } else if (before(seq, call->rx_top)) { |
528 | /* Send an immediate ACK if we fill in a hole */ | |
529 | if (!ack) { | |
530 | ack = RXRPC_ACK_DELAY; | |
531 | ack_serial = serial; | |
532 | } | |
533 | immediate_ack = true; | |
534 | } | |
58dc63c9 | 535 | if (flags & RXRPC_LAST_PACKET) { |
816c9fce | 536 | set_bit(RXRPC_CALL_RX_LAST, &call->flags); |
58dc63c9 DH |
537 | trace_rxrpc_receive(call, rxrpc_receive_queue_last, serial, seq); |
538 | } else { | |
539 | trace_rxrpc_receive(call, rxrpc_receive_queue, serial, seq); | |
540 | } | |
248f219c DH |
541 | queued = true; |
542 | ||
543 | if (after_eq(seq, call->rx_expect_next)) { | |
544 | if (after(seq, call->rx_expect_next)) { | |
545 | _net("OOS %u > %u", seq, call->rx_expect_next); | |
546 | ack = RXRPC_ACK_OUT_OF_SEQUENCE; | |
547 | ack_serial = serial; | |
548 | } | |
549 | call->rx_expect_next = seq + 1; | |
17926a79 DH |
550 | } |
551 | ||
248f219c DH |
552 | skip: |
553 | offset += len; | |
554 | if (flags & RXRPC_JUMBO_PACKET) { | |
555 | if (skb_copy_bits(skb, offset, &flags, 1) < 0) | |
556 | return rxrpc_proto_abort("XJF", call, seq); | |
557 | offset += sizeof(struct rxrpc_jumbo_header); | |
558 | seq++; | |
559 | serial++; | |
560 | annotation++; | |
561 | if (flags & RXRPC_JUMBO_PACKET) | |
562 | annotation |= RXRPC_RX_ANNO_JLAST; | |
75e42126 DH |
563 | if (after(seq, hard_ack + call->rx_winsize)) { |
564 | ack = RXRPC_ACK_EXCEEDS_WINDOW; | |
565 | ack_serial = serial; | |
566 | if (!jumbo_bad) { | |
567 | call->nr_jumbo_bad++; | |
568 | jumbo_bad = true; | |
569 | } | |
570 | goto ack; | |
571 | } | |
248f219c DH |
572 | |
573 | _proto("Rx DATA Jumbo %%%u", serial); | |
574 | goto next_subpacket; | |
575 | } | |
17926a79 | 576 | |
248f219c DH |
577 | if (queued && flags & RXRPC_LAST_PACKET && !ack) { |
578 | ack = RXRPC_ACK_DELAY; | |
579 | ack_serial = serial; | |
580 | } | |
17926a79 | 581 | |
248f219c DH |
582 | ack: |
583 | if (ack) | |
584 | rxrpc_propose_ACK(call, ack, skew, ack_serial, | |
9c7ad434 DH |
585 | immediate_ack, true, |
586 | rxrpc_propose_ack_input_data); | |
17926a79 | 587 | |
248f219c DH |
588 | if (sp->hdr.seq == READ_ONCE(call->rx_hard_ack) + 1) |
589 | rxrpc_notify_socket(call); | |
590 | _leave(" [queued]"); | |
17926a79 DH |
591 | } |
592 | ||
50235c4b DH |
593 | /* |
594 | * Process a requested ACK. | |
595 | */ | |
596 | static void rxrpc_input_requested_ack(struct rxrpc_call *call, | |
597 | ktime_t resp_time, | |
598 | rxrpc_serial_t orig_serial, | |
599 | rxrpc_serial_t ack_serial) | |
600 | { | |
601 | struct rxrpc_skb_priv *sp; | |
602 | struct sk_buff *skb; | |
603 | ktime_t sent_at; | |
604 | int ix; | |
605 | ||
606 | for (ix = 0; ix < RXRPC_RXTX_BUFF_SIZE; ix++) { | |
607 | skb = call->rxtx_buffer[ix]; | |
608 | if (!skb) | |
609 | continue; | |
610 | ||
611 | sp = rxrpc_skb(skb); | |
612 | if (sp->hdr.serial != orig_serial) | |
613 | continue; | |
614 | smp_rmb(); | |
615 | sent_at = skb->tstamp; | |
616 | goto found; | |
617 | } | |
618 | return; | |
619 | ||
620 | found: | |
621 | rxrpc_peer_add_rtt(call, rxrpc_rtt_rx_requested_ack, | |
622 | orig_serial, ack_serial, sent_at, resp_time); | |
623 | } | |
624 | ||
8e83134d DH |
625 | /* |
626 | * Process a ping response. | |
627 | */ | |
628 | static void rxrpc_input_ping_response(struct rxrpc_call *call, | |
629 | ktime_t resp_time, | |
630 | rxrpc_serial_t orig_serial, | |
631 | rxrpc_serial_t ack_serial) | |
632 | { | |
633 | rxrpc_serial_t ping_serial; | |
634 | ktime_t ping_time; | |
635 | ||
a5af7e1f | 636 | ping_time = call->ping_time; |
8e83134d | 637 | smp_rmb(); |
a5af7e1f | 638 | ping_serial = call->ping_serial; |
8e83134d DH |
639 | |
640 | if (!test_bit(RXRPC_CALL_PINGING, &call->flags) || | |
641 | before(orig_serial, ping_serial)) | |
642 | return; | |
643 | clear_bit(RXRPC_CALL_PINGING, &call->flags); | |
644 | if (after(orig_serial, ping_serial)) | |
645 | return; | |
646 | ||
647 | rxrpc_peer_add_rtt(call, rxrpc_rtt_rx_ping_response, | |
648 | orig_serial, ack_serial, ping_time, resp_time); | |
649 | } | |
650 | ||
17926a79 | 651 | /* |
248f219c | 652 | * Process the extra information that may be appended to an ACK packet |
17926a79 | 653 | */ |
248f219c DH |
654 | static void rxrpc_input_ackinfo(struct rxrpc_call *call, struct sk_buff *skb, |
655 | struct rxrpc_ackinfo *ackinfo) | |
17926a79 | 656 | { |
248f219c DH |
657 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
658 | struct rxrpc_peer *peer; | |
659 | unsigned int mtu; | |
702f2ac8 | 660 | bool wake = false; |
01fd0742 | 661 | u32 rwind = ntohl(ackinfo->rwind); |
248f219c DH |
662 | |
663 | _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }", | |
664 | sp->hdr.serial, | |
665 | ntohl(ackinfo->rxMTU), ntohl(ackinfo->maxMTU), | |
01fd0742 | 666 | rwind, ntohl(ackinfo->jumbo_max)); |
248f219c | 667 | |
702f2ac8 DH |
668 | if (call->tx_winsize != rwind) { |
669 | if (rwind > RXRPC_RXTX_BUFF_SIZE - 1) | |
670 | rwind = RXRPC_RXTX_BUFF_SIZE - 1; | |
671 | if (rwind > call->tx_winsize) | |
672 | wake = true; | |
740586d2 DH |
673 | trace_rxrpc_rx_rwind_change(call, sp->hdr.serial, |
674 | ntohl(ackinfo->rwind), wake); | |
702f2ac8 DH |
675 | call->tx_winsize = rwind; |
676 | } | |
677 | ||
08511150 DH |
678 | if (call->cong_ssthresh > rwind) |
679 | call->cong_ssthresh = rwind; | |
248f219c DH |
680 | |
681 | mtu = min(ntohl(ackinfo->rxMTU), ntohl(ackinfo->maxMTU)); | |
682 | ||
683 | peer = call->peer; | |
684 | if (mtu < peer->maxdata) { | |
685 | spin_lock_bh(&peer->lock); | |
686 | peer->maxdata = mtu; | |
687 | peer->mtu = mtu + peer->hdrsize; | |
688 | spin_unlock_bh(&peer->lock); | |
689 | _net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata); | |
690 | } | |
702f2ac8 DH |
691 | |
692 | if (wake) | |
693 | wake_up(&call->waitq); | |
248f219c | 694 | } |
17926a79 | 695 | |
248f219c DH |
696 | /* |
697 | * Process individual soft ACKs. | |
698 | * | |
699 | * Each ACK in the array corresponds to one packet and can be either an ACK or | |
700 | * a NAK. If we get find an explicitly NAK'd packet we resend immediately; | |
701 | * packets that lie beyond the end of the ACK list are scheduled for resend by | |
702 | * the timer on the basis that the peer might just not have processed them at | |
703 | * the time the ACK was sent. | |
704 | */ | |
705 | static void rxrpc_input_soft_acks(struct rxrpc_call *call, u8 *acks, | |
31a1b989 DH |
706 | rxrpc_seq_t seq, int nr_acks, |
707 | struct rxrpc_ack_summary *summary) | |
248f219c | 708 | { |
248f219c | 709 | int ix; |
f07373ea | 710 | u8 annotation, anno_type; |
248f219c DH |
711 | |
712 | for (; nr_acks > 0; nr_acks--, seq++) { | |
713 | ix = seq & RXRPC_RXTX_BUFF_MASK; | |
f07373ea DH |
714 | annotation = call->rxtx_annotations[ix]; |
715 | anno_type = annotation & RXRPC_TX_ANNO_MASK; | |
716 | annotation &= ~RXRPC_TX_ANNO_MASK; | |
d01dc4c3 | 717 | switch (*acks++) { |
248f219c | 718 | case RXRPC_ACK_TYPE_ACK: |
31a1b989 | 719 | summary->nr_acks++; |
f07373ea DH |
720 | if (anno_type == RXRPC_TX_ANNO_ACK) |
721 | continue; | |
31a1b989 | 722 | summary->nr_new_acks++; |
f07373ea DH |
723 | call->rxtx_annotations[ix] = |
724 | RXRPC_TX_ANNO_ACK | annotation; | |
248f219c DH |
725 | break; |
726 | case RXRPC_ACK_TYPE_NACK: | |
31a1b989 DH |
727 | if (!summary->nr_nacks && |
728 | call->acks_lowest_nak != seq) { | |
729 | call->acks_lowest_nak = seq; | |
730 | summary->new_low_nack = true; | |
731 | } | |
732 | summary->nr_nacks++; | |
f07373ea | 733 | if (anno_type == RXRPC_TX_ANNO_NAK) |
248f219c | 734 | continue; |
31a1b989 | 735 | summary->nr_new_nacks++; |
be8aa338 DH |
736 | if (anno_type == RXRPC_TX_ANNO_RETRANS) |
737 | continue; | |
f07373ea DH |
738 | call->rxtx_annotations[ix] = |
739 | RXRPC_TX_ANNO_NAK | annotation; | |
248f219c DH |
740 | break; |
741 | default: | |
742 | return rxrpc_proto_abort("SFT", call, 0); | |
17926a79 | 743 | } |
17926a79 DH |
744 | } |
745 | } | |
746 | ||
747 | /* | |
248f219c DH |
748 | * Process an ACK packet. |
749 | * | |
750 | * ack.firstPacket is the sequence number of the first soft-ACK'd/NAK'd packet | |
751 | * in the ACK array. Anything before that is hard-ACK'd and may be discarded. | |
752 | * | |
753 | * A hard-ACK means that a packet has been processed and may be discarded; a | |
754 | * soft-ACK means that the packet may be discarded and retransmission | |
755 | * requested. A phase is complete when all packets are hard-ACK'd. | |
17926a79 | 756 | */ |
248f219c DH |
757 | static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb, |
758 | u16 skew) | |
17926a79 | 759 | { |
31a1b989 | 760 | struct rxrpc_ack_summary summary = { 0 }; |
17926a79 | 761 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
248f219c DH |
762 | union { |
763 | struct rxrpc_ackpacket ack; | |
764 | struct rxrpc_ackinfo info; | |
765 | u8 acks[RXRPC_MAXACKS]; | |
766 | } buf; | |
8e83134d | 767 | rxrpc_serial_t acked_serial; |
248f219c | 768 | rxrpc_seq_t first_soft_ack, hard_ack; |
775e5b71 | 769 | int nr_acks, offset, ioffset; |
248f219c DH |
770 | |
771 | _enter(""); | |
772 | ||
775e5b71 DH |
773 | offset = sizeof(struct rxrpc_wire_header); |
774 | if (skb_copy_bits(skb, offset, &buf.ack, sizeof(buf.ack)) < 0) { | |
248f219c DH |
775 | _debug("extraction failure"); |
776 | return rxrpc_proto_abort("XAK", call, 0); | |
17926a79 | 777 | } |
775e5b71 | 778 | offset += sizeof(buf.ack); |
248f219c | 779 | |
8e83134d | 780 | acked_serial = ntohl(buf.ack.serial); |
248f219c DH |
781 | first_soft_ack = ntohl(buf.ack.firstPacket); |
782 | hard_ack = first_soft_ack - 1; | |
783 | nr_acks = buf.ack.nAcks; | |
31a1b989 DH |
784 | summary.ack_reason = (buf.ack.reason < RXRPC_ACK__INVALID ? |
785 | buf.ack.reason : RXRPC_ACK__INVALID); | |
248f219c | 786 | |
b1d9f7fd DH |
787 | trace_rxrpc_rx_ack(call, sp->hdr.serial, acked_serial, |
788 | first_soft_ack, ntohl(buf.ack.previousPacket), | |
789 | summary.ack_reason, nr_acks); | |
ec71eb9a | 790 | |
8e83134d DH |
791 | if (buf.ack.reason == RXRPC_ACK_PING_RESPONSE) |
792 | rxrpc_input_ping_response(call, skb->tstamp, acked_serial, | |
793 | sp->hdr.serial); | |
50235c4b DH |
794 | if (buf.ack.reason == RXRPC_ACK_REQUESTED) |
795 | rxrpc_input_requested_ack(call, skb->tstamp, acked_serial, | |
796 | sp->hdr.serial); | |
8e83134d | 797 | |
248f219c DH |
798 | if (buf.ack.reason == RXRPC_ACK_PING) { |
799 | _proto("Rx ACK %%%u PING Request", sp->hdr.serial); | |
800 | rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE, | |
9c7ad434 DH |
801 | skew, sp->hdr.serial, true, true, |
802 | rxrpc_propose_ack_respond_to_ping); | |
248f219c | 803 | } else if (sp->hdr.flags & RXRPC_REQUEST_ACK) { |
563ea7d5 | 804 | rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, |
9c7ad434 DH |
805 | skew, sp->hdr.serial, true, true, |
806 | rxrpc_propose_ack_respond_to_ack); | |
17926a79 DH |
807 | } |
808 | ||
f1d27ff6 DH |
809 | /* Discard any out-of-order or duplicate ACKs. */ |
810 | if (before_eq(sp->hdr.serial, call->acks_latest)) { | |
811 | _debug("discard ACK %d <= %d", | |
812 | sp->hdr.serial, call->acks_latest); | |
813 | return; | |
814 | } | |
815 | call->acks_latest_ts = skb->tstamp; | |
816 | call->acks_latest = sp->hdr.serial; | |
817 | ||
818 | /* Parse rwind and mtu sizes if provided. */ | |
775e5b71 DH |
819 | ioffset = offset + nr_acks + 3; |
820 | if (skb->len >= ioffset + sizeof(buf.info)) { | |
821 | if (skb_copy_bits(skb, ioffset, &buf.info, sizeof(buf.info)) < 0) | |
248f219c DH |
822 | return rxrpc_proto_abort("XAI", call, 0); |
823 | rxrpc_input_ackinfo(call, skb, &buf.info); | |
824 | } | |
17926a79 | 825 | |
248f219c DH |
826 | if (first_soft_ack == 0) |
827 | return rxrpc_proto_abort("AK0", call, 0); | |
17926a79 | 828 | |
248f219c | 829 | /* Ignore ACKs unless we are or have just been transmitting. */ |
146d8fef | 830 | switch (READ_ONCE(call->state)) { |
248f219c DH |
831 | case RXRPC_CALL_CLIENT_SEND_REQUEST: |
832 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
833 | case RXRPC_CALL_SERVER_SEND_REPLY: | |
834 | case RXRPC_CALL_SERVER_AWAIT_ACK: | |
835 | break; | |
17926a79 | 836 | default: |
248f219c DH |
837 | return; |
838 | } | |
17926a79 | 839 | |
248f219c DH |
840 | if (before(hard_ack, call->tx_hard_ack) || |
841 | after(hard_ack, call->tx_top)) | |
842 | return rxrpc_proto_abort("AKW", call, 0); | |
70790dbe DH |
843 | if (nr_acks > call->tx_top - hard_ack) |
844 | return rxrpc_proto_abort("AKN", call, 0); | |
17926a79 | 845 | |
9a6d4570 DH |
846 | if (after(hard_ack, call->tx_hard_ack)) { |
847 | if (rxrpc_rotate_tx_window(call, hard_ack, &summary)) { | |
848 | rxrpc_end_tx_phase(call, false, "ETA"); | |
849 | return; | |
850 | } | |
851 | } | |
17926a79 | 852 | |
70790dbe | 853 | if (nr_acks > 0) { |
775e5b71 | 854 | if (skb_copy_bits(skb, offset, buf.acks, nr_acks) < 0) |
70790dbe | 855 | return rxrpc_proto_abort("XSA", call, 0); |
31a1b989 DH |
856 | rxrpc_input_soft_acks(call, buf.acks, first_soft_ack, nr_acks, |
857 | &summary); | |
70790dbe DH |
858 | } |
859 | ||
0d967960 DH |
860 | if (call->rxtx_annotations[call->tx_top & RXRPC_RXTX_BUFF_MASK] & |
861 | RXRPC_TX_ANNO_LAST && | |
a9f312d9 DH |
862 | summary.nr_acks == call->tx_top - hard_ack && |
863 | rxrpc_is_client_call(call)) | |
0d967960 DH |
864 | rxrpc_propose_ACK(call, RXRPC_ACK_PING, skew, sp->hdr.serial, |
865 | false, true, | |
866 | rxrpc_propose_ack_ping_for_lost_reply); | |
57494343 | 867 | |
ed1e8679 | 868 | return rxrpc_congestion_management(call, skb, &summary, acked_serial); |
17926a79 DH |
869 | } |
870 | ||
871 | /* | |
248f219c | 872 | * Process an ACKALL packet. |
17926a79 | 873 | */ |
248f219c | 874 | static void rxrpc_input_ackall(struct rxrpc_call *call, struct sk_buff *skb) |
17926a79 | 875 | { |
31a1b989 | 876 | struct rxrpc_ack_summary summary = { 0 }; |
248f219c | 877 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
17926a79 | 878 | |
248f219c | 879 | _proto("Rx ACKALL %%%u", sp->hdr.serial); |
17926a79 | 880 | |
9a6d4570 | 881 | if (rxrpc_rotate_tx_window(call, call->tx_top, &summary)) |
70790dbe | 882 | rxrpc_end_tx_phase(call, false, "ETL"); |
248f219c | 883 | } |
17926a79 | 884 | |
248f219c | 885 | /* |
005ede28 | 886 | * Process an ABORT packet directed at a call. |
248f219c DH |
887 | */ |
888 | static void rxrpc_input_abort(struct rxrpc_call *call, struct sk_buff *skb) | |
889 | { | |
890 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
891 | __be32 wtmp; | |
892 | u32 abort_code = RX_CALL_DEAD; | |
17926a79 | 893 | |
248f219c | 894 | _enter(""); |
17926a79 | 895 | |
248f219c | 896 | if (skb->len >= 4 && |
775e5b71 DH |
897 | skb_copy_bits(skb, sizeof(struct rxrpc_wire_header), |
898 | &wtmp, sizeof(wtmp)) >= 0) | |
248f219c | 899 | abort_code = ntohl(wtmp); |
17926a79 | 900 | |
005ede28 DH |
901 | trace_rxrpc_rx_abort(call, sp->hdr.serial, abort_code); |
902 | ||
248f219c | 903 | _proto("Rx ABORT %%%u { %x }", sp->hdr.serial, abort_code); |
17926a79 | 904 | |
248f219c | 905 | if (rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED, |
3a92789a | 906 | abort_code, -ECONNABORTED)) |
248f219c | 907 | rxrpc_notify_socket(call); |
17926a79 DH |
908 | } |
909 | ||
910 | /* | |
248f219c | 911 | * Process an incoming call packet. |
17926a79 | 912 | */ |
248f219c DH |
913 | static void rxrpc_input_call_packet(struct rxrpc_call *call, |
914 | struct sk_buff *skb, u16 skew) | |
17926a79 | 915 | { |
248f219c | 916 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
17926a79 | 917 | |
7727640c | 918 | _enter("%p,%p", call, skb); |
17926a79 | 919 | |
248f219c DH |
920 | switch (sp->hdr.type) { |
921 | case RXRPC_PACKET_TYPE_DATA: | |
922 | rxrpc_input_data(call, skb, skew); | |
923 | break; | |
f5c17aae | 924 | |
248f219c DH |
925 | case RXRPC_PACKET_TYPE_ACK: |
926 | rxrpc_input_ack(call, skb, skew); | |
17926a79 | 927 | break; |
17926a79 | 928 | |
248f219c DH |
929 | case RXRPC_PACKET_TYPE_BUSY: |
930 | _proto("Rx BUSY %%%u", sp->hdr.serial); | |
17926a79 | 931 | |
248f219c DH |
932 | /* Just ignore BUSY packets from the server; the retry and |
933 | * lifespan timers will take care of business. BUSY packets | |
934 | * from the client don't make sense. | |
935 | */ | |
936 | break; | |
17926a79 | 937 | |
248f219c DH |
938 | case RXRPC_PACKET_TYPE_ABORT: |
939 | rxrpc_input_abort(call, skb); | |
940 | break; | |
17926a79 | 941 | |
248f219c DH |
942 | case RXRPC_PACKET_TYPE_ACKALL: |
943 | rxrpc_input_ackall(call, skb); | |
944 | break; | |
f5c17aae | 945 | |
248f219c | 946 | default: |
248f219c | 947 | break; |
17926a79 | 948 | } |
248f219c | 949 | |
17926a79 DH |
950 | _leave(""); |
951 | } | |
952 | ||
b3156274 DH |
953 | /* |
954 | * Handle a new call on a channel implicitly completing the preceding call on | |
955 | * that channel. | |
956 | * | |
957 | * TODO: If callNumber > call_id + 1, renegotiate security. | |
958 | */ | |
959 | static void rxrpc_input_implicit_end_call(struct rxrpc_connection *conn, | |
960 | struct rxrpc_call *call) | |
961 | { | |
146d8fef | 962 | switch (READ_ONCE(call->state)) { |
b3156274 DH |
963 | case RXRPC_CALL_SERVER_AWAIT_ACK: |
964 | rxrpc_call_completed(call); | |
965 | break; | |
966 | case RXRPC_CALL_COMPLETE: | |
967 | break; | |
968 | default: | |
3a92789a | 969 | if (rxrpc_abort_call("IMP", call, 0, RX_CALL_DEAD, -ESHUTDOWN)) { |
b3156274 DH |
970 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
971 | rxrpc_queue_call(call); | |
972 | } | |
973 | break; | |
974 | } | |
975 | ||
b1d9f7fd | 976 | trace_rxrpc_improper_term(call); |
b3156274 DH |
977 | __rxrpc_disconnect_call(conn, call); |
978 | rxrpc_notify_socket(call); | |
979 | } | |
980 | ||
17926a79 DH |
981 | /* |
982 | * post connection-level events to the connection | |
18bfeba5 DH |
983 | * - this includes challenges, responses, some aborts and call terminal packet |
984 | * retransmission. | |
17926a79 | 985 | */ |
2e7e9758 | 986 | static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn, |
17926a79 DH |
987 | struct sk_buff *skb) |
988 | { | |
989 | _enter("%p,%p", conn, skb); | |
990 | ||
17926a79 | 991 | skb_queue_tail(&conn->rx_queue, skb); |
2e7e9758 | 992 | rxrpc_queue_conn(conn); |
17926a79 DH |
993 | } |
994 | ||
44ba0698 DH |
995 | /* |
996 | * post endpoint-level events to the local endpoint | |
997 | * - this includes debug and version messages | |
998 | */ | |
999 | static void rxrpc_post_packet_to_local(struct rxrpc_local *local, | |
1000 | struct sk_buff *skb) | |
1001 | { | |
1002 | _enter("%p,%p", local, skb); | |
1003 | ||
44ba0698 | 1004 | skb_queue_tail(&local->event_queue, skb); |
5acbee46 | 1005 | rxrpc_queue_local(local); |
44ba0698 DH |
1006 | } |
1007 | ||
248f219c DH |
1008 | /* |
1009 | * put a packet up for transport-level abort | |
1010 | */ | |
1011 | static void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb) | |
1012 | { | |
1013 | CHECK_SLAB_OKAY(&local->usage); | |
1014 | ||
1015 | skb_queue_tail(&local->reject_queue, skb); | |
1016 | rxrpc_queue_local(local); | |
1017 | } | |
1018 | ||
0d12f8a4 DH |
1019 | /* |
1020 | * Extract the wire header from a packet and translate the byte order. | |
1021 | */ | |
1022 | static noinline | |
1023 | int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb) | |
1024 | { | |
1025 | struct rxrpc_wire_header whdr; | |
1026 | ||
1027 | /* dig out the RxRPC connection details */ | |
fb46f6ee DH |
1028 | if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0) { |
1029 | trace_rxrpc_rx_eproto(NULL, sp->hdr.serial, | |
1030 | tracepoint_string("bad_hdr")); | |
0d12f8a4 | 1031 | return -EBADMSG; |
fb46f6ee | 1032 | } |
0d12f8a4 DH |
1033 | |
1034 | memset(sp, 0, sizeof(*sp)); | |
1035 | sp->hdr.epoch = ntohl(whdr.epoch); | |
1036 | sp->hdr.cid = ntohl(whdr.cid); | |
1037 | sp->hdr.callNumber = ntohl(whdr.callNumber); | |
1038 | sp->hdr.seq = ntohl(whdr.seq); | |
1039 | sp->hdr.serial = ntohl(whdr.serial); | |
1040 | sp->hdr.flags = whdr.flags; | |
1041 | sp->hdr.type = whdr.type; | |
1042 | sp->hdr.userStatus = whdr.userStatus; | |
1043 | sp->hdr.securityIndex = whdr.securityIndex; | |
1044 | sp->hdr._rsvd = ntohs(whdr._rsvd); | |
1045 | sp->hdr.serviceId = ntohs(whdr.serviceId); | |
1046 | return 0; | |
1047 | } | |
1048 | ||
17926a79 DH |
1049 | /* |
1050 | * handle data received on the local endpoint | |
1051 | * - may be called in interrupt context | |
4f95dd78 DH |
1052 | * |
1053 | * The socket is locked by the caller and this prevents the socket from being | |
1054 | * shut down and the local endpoint from going away, thus sk_user_data will not | |
1055 | * be cleared until this function returns. | |
17926a79 | 1056 | */ |
248f219c | 1057 | void rxrpc_data_ready(struct sock *udp_sk) |
17926a79 | 1058 | { |
8496af50 | 1059 | struct rxrpc_connection *conn; |
248f219c DH |
1060 | struct rxrpc_channel *chan; |
1061 | struct rxrpc_call *call; | |
17926a79 | 1062 | struct rxrpc_skb_priv *sp; |
248f219c | 1063 | struct rxrpc_local *local = udp_sk->sk_user_data; |
17926a79 | 1064 | struct sk_buff *skb; |
248f219c | 1065 | unsigned int channel; |
563ea7d5 | 1066 | int ret, skew; |
17926a79 | 1067 | |
248f219c | 1068 | _enter("%p", udp_sk); |
17926a79 DH |
1069 | |
1070 | ASSERT(!irqs_disabled()); | |
1071 | ||
7c13f97f | 1072 | skb = skb_recv_udp(udp_sk, 0, 1, &ret); |
17926a79 | 1073 | if (!skb) { |
17926a79 DH |
1074 | if (ret == -EAGAIN) |
1075 | return; | |
1076 | _debug("UDP socket error %d", ret); | |
1077 | return; | |
1078 | } | |
1079 | ||
71f3ca40 | 1080 | rxrpc_new_skb(skb, rxrpc_skb_rx_received); |
17926a79 DH |
1081 | |
1082 | _net("recv skb %p", skb); | |
1083 | ||
1084 | /* we'll probably need to checksum it (didn't call sock_recvmsg) */ | |
1085 | if (skb_checksum_complete(skb)) { | |
71f3ca40 | 1086 | rxrpc_free_skb(skb, rxrpc_skb_rx_freed); |
02c22347 | 1087 | __UDP_INC_STATS(&init_net, UDP_MIB_INERRORS, 0); |
17926a79 DH |
1088 | _leave(" [CSUM failed]"); |
1089 | return; | |
1090 | } | |
1091 | ||
02c22347 | 1092 | __UDP_INC_STATS(&init_net, UDP_MIB_INDATAGRAMS, 0); |
1781f7f5 | 1093 | |
7c13f97f PA |
1094 | /* The UDP protocol already released all skb resources; |
1095 | * we are free to add our own data there. | |
0d12f8a4 | 1096 | */ |
17926a79 | 1097 | sp = rxrpc_skb(skb); |
17926a79 | 1098 | |
89b475ab DH |
1099 | /* dig out the RxRPC connection details */ |
1100 | if (rxrpc_extract_header(sp, skb) < 0) | |
1101 | goto bad_message; | |
1102 | ||
8a681c36 DH |
1103 | if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) { |
1104 | static int lose; | |
1105 | if ((lose++ & 7) == 7) { | |
89b475ab | 1106 | trace_rxrpc_rx_lose(sp); |
8a681c36 DH |
1107 | rxrpc_lose_skb(skb, rxrpc_skb_rx_lost); |
1108 | return; | |
1109 | } | |
1110 | } | |
1111 | ||
49e19ec7 | 1112 | trace_rxrpc_rx_packet(sp); |
17926a79 DH |
1113 | |
1114 | _net("Rx RxRPC %s ep=%x call=%x:%x", | |
1115 | sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient", | |
0d12f8a4 | 1116 | sp->hdr.epoch, sp->hdr.cid, sp->hdr.callNumber); |
17926a79 | 1117 | |
351c1e64 DH |
1118 | if (sp->hdr.type >= RXRPC_N_PACKET_TYPES || |
1119 | !((RXRPC_SUPPORTED_PACKET_TYPES >> sp->hdr.type) & 1)) { | |
17926a79 DH |
1120 | _proto("Rx Bad Packet Type %u", sp->hdr.type); |
1121 | goto bad_message; | |
1122 | } | |
1123 | ||
248f219c DH |
1124 | switch (sp->hdr.type) { |
1125 | case RXRPC_PACKET_TYPE_VERSION: | |
44ba0698 DH |
1126 | rxrpc_post_packet_to_local(local, skb); |
1127 | goto out; | |
bc6e1ea3 | 1128 | |
248f219c DH |
1129 | case RXRPC_PACKET_TYPE_BUSY: |
1130 | if (sp->hdr.flags & RXRPC_CLIENT_INITIATED) | |
1131 | goto discard; | |
1132 | ||
1133 | case RXRPC_PACKET_TYPE_DATA: | |
1134 | if (sp->hdr.callNumber == 0) | |
1135 | goto bad_message; | |
1136 | if (sp->hdr.flags & RXRPC_JUMBO_PACKET && | |
1137 | !rxrpc_validate_jumbo(skb)) | |
1138 | goto bad_message; | |
1139 | break; | |
1140 | } | |
17926a79 | 1141 | |
8496af50 DH |
1142 | rcu_read_lock(); |
1143 | ||
8496af50 | 1144 | conn = rxrpc_find_connection_rcu(local, skb); |
248f219c DH |
1145 | if (conn) { |
1146 | if (sp->hdr.securityIndex != conn->security_ix) | |
1147 | goto wrong_security; | |
563ea7d5 | 1148 | |
4e255721 DH |
1149 | if (sp->hdr.serviceId != conn->service_id) { |
1150 | if (!test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags) || | |
1151 | conn->service_id != conn->params.service_id) | |
1152 | goto reupgrade; | |
1153 | conn->service_id = sp->hdr.serviceId; | |
1154 | } | |
1155 | ||
248f219c DH |
1156 | if (sp->hdr.callNumber == 0) { |
1157 | /* Connection-level packet */ | |
1158 | _debug("CONN %p {%d}", conn, conn->debug_id); | |
1159 | rxrpc_post_packet_to_conn(conn, skb); | |
1160 | goto out_unlock; | |
1161 | } | |
1162 | ||
1163 | /* Note the serial number skew here */ | |
1164 | skew = (int)sp->hdr.serial - (int)conn->hi_serial; | |
1165 | if (skew >= 0) { | |
1166 | if (skew > 0) | |
1167 | conn->hi_serial = sp->hdr.serial; | |
1168 | } else { | |
1169 | skew = -skew; | |
1170 | skew = min(skew, 65535); | |
1171 | } | |
17926a79 | 1172 | |
8496af50 | 1173 | /* Call-bound packets are routed by connection channel. */ |
248f219c DH |
1174 | channel = sp->hdr.cid & RXRPC_CHANNELMASK; |
1175 | chan = &conn->channels[channel]; | |
18bfeba5 DH |
1176 | |
1177 | /* Ignore really old calls */ | |
1178 | if (sp->hdr.callNumber < chan->last_call) | |
1179 | goto discard_unlock; | |
1180 | ||
1181 | if (sp->hdr.callNumber == chan->last_call) { | |
637b9b18 DH |
1182 | if (chan->call || |
1183 | sp->hdr.type == RXRPC_PACKET_TYPE_ABORT) | |
1184 | goto discard_unlock; | |
1185 | ||
1186 | /* For the previous service call, if completed | |
1187 | * successfully, we discard all further packets. | |
18bfeba5 | 1188 | */ |
2266ffde | 1189 | if (rxrpc_conn_is_service(conn) && |
637b9b18 | 1190 | chan->last_type == RXRPC_PACKET_TYPE_ACK) |
18bfeba5 DH |
1191 | goto discard_unlock; |
1192 | ||
637b9b18 DH |
1193 | /* But otherwise we need to retransmit the final packet |
1194 | * from data cached in the connection record. | |
18bfeba5 DH |
1195 | */ |
1196 | rxrpc_post_packet_to_conn(conn, skb); | |
1197 | goto out_unlock; | |
1198 | } | |
0d12f8a4 | 1199 | |
18bfeba5 | 1200 | call = rcu_dereference(chan->call); |
b3156274 DH |
1201 | |
1202 | if (sp->hdr.callNumber > chan->call_id) { | |
1203 | if (!(sp->hdr.flags & RXRPC_CLIENT_INITIATED)) { | |
1204 | rcu_read_unlock(); | |
1205 | goto reject_packet; | |
1206 | } | |
1207 | if (call) | |
1208 | rxrpc_input_implicit_end_call(conn, call); | |
1209 | call = NULL; | |
1210 | } | |
4e255721 DH |
1211 | |
1212 | if (call && sp->hdr.serviceId != call->service_id) | |
1213 | call->service_id = sp->hdr.serviceId; | |
248f219c DH |
1214 | } else { |
1215 | skew = 0; | |
1216 | call = NULL; | |
1217 | } | |
8496af50 | 1218 | |
248f219c DH |
1219 | if (!call || atomic_read(&call->usage) == 0) { |
1220 | if (!(sp->hdr.type & RXRPC_CLIENT_INITIATED) || | |
1221 | sp->hdr.callNumber == 0 || | |
1222 | sp->hdr.type != RXRPC_PACKET_TYPE_DATA) | |
1223 | goto bad_message_unlock; | |
1224 | if (sp->hdr.seq != 1) | |
1225 | goto discard_unlock; | |
1226 | call = rxrpc_new_incoming_call(local, conn, skb); | |
1227 | if (!call) { | |
1228 | rcu_read_unlock(); | |
1229 | goto reject_packet; | |
1230 | } | |
8e83134d | 1231 | rxrpc_send_ping(call, skb, skew); |
540b1c48 | 1232 | mutex_unlock(&call->user_mutex); |
7727640c | 1233 | } |
44ba0698 | 1234 | |
248f219c DH |
1235 | rxrpc_input_call_packet(call, skb, skew); |
1236 | goto discard_unlock; | |
1237 | ||
18bfeba5 | 1238 | discard_unlock: |
8496af50 | 1239 | rcu_read_unlock(); |
248f219c | 1240 | discard: |
71f3ca40 | 1241 | rxrpc_free_skb(skb, rxrpc_skb_rx_freed); |
44ba0698 | 1242 | out: |
49e19ec7 | 1243 | trace_rxrpc_rx_done(0, 0); |
17926a79 DH |
1244 | return; |
1245 | ||
248f219c | 1246 | out_unlock: |
8496af50 | 1247 | rcu_read_unlock(); |
248f219c | 1248 | goto out; |
8496af50 | 1249 | |
248f219c DH |
1250 | wrong_security: |
1251 | rcu_read_unlock(); | |
1252 | trace_rxrpc_abort("SEC", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, | |
1253 | RXKADINCONSISTENCY, EBADMSG); | |
1254 | skb->priority = RXKADINCONSISTENCY; | |
1255 | goto post_abort; | |
17926a79 | 1256 | |
4e255721 DH |
1257 | reupgrade: |
1258 | rcu_read_unlock(); | |
1259 | trace_rxrpc_abort("UPG", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, | |
1260 | RX_PROTOCOL_ERROR, EBADMSG); | |
1261 | goto protocol_error; | |
1262 | ||
248f219c DH |
1263 | bad_message_unlock: |
1264 | rcu_read_unlock(); | |
17926a79 | 1265 | bad_message: |
248f219c DH |
1266 | trace_rxrpc_abort("BAD", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, |
1267 | RX_PROTOCOL_ERROR, EBADMSG); | |
4e255721 | 1268 | protocol_error: |
17926a79 | 1269 | skb->priority = RX_PROTOCOL_ERROR; |
248f219c DH |
1270 | post_abort: |
1271 | skb->mark = RXRPC_SKB_MARK_LOCAL_ABORT; | |
49e19ec7 DH |
1272 | reject_packet: |
1273 | trace_rxrpc_rx_done(skb->mark, skb->priority); | |
17926a79 | 1274 | rxrpc_reject_packet(local, skb); |
17926a79 DH |
1275 | _leave(" [badmsg]"); |
1276 | } |