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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
17926a79 DH |
2 | /* RxRPC packet reception |
3 | * | |
248f219c | 4 | * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved. |
17926a79 | 5 | * Written by David Howells (dhowells@redhat.com) |
17926a79 DH |
6 | */ |
7 | ||
9b6d5398 JP |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | ||
17926a79 DH |
10 | #include <linux/module.h> |
11 | #include <linux/net.h> | |
12 | #include <linux/skbuff.h> | |
13 | #include <linux/errqueue.h> | |
14 | #include <linux/udp.h> | |
15 | #include <linux/in.h> | |
16 | #include <linux/in6.h> | |
17 | #include <linux/icmp.h> | |
5a0e3ad6 | 18 | #include <linux/gfp.h> |
17926a79 DH |
19 | #include <net/sock.h> |
20 | #include <net/af_rxrpc.h> | |
21 | #include <net/ip.h> | |
1781f7f5 | 22 | #include <net/udp.h> |
0283328e | 23 | #include <net/net_namespace.h> |
17926a79 DH |
24 | #include "ar-internal.h" |
25 | ||
248f219c DH |
26 | static void rxrpc_proto_abort(const char *why, |
27 | struct rxrpc_call *call, rxrpc_seq_t seq) | |
28 | { | |
3a92789a | 29 | if (rxrpc_abort_call(why, call, seq, RX_PROTOCOL_ERROR, -EBADMSG)) { |
248f219c DH |
30 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
31 | rxrpc_queue_call(call); | |
32 | } | |
33 | } | |
34 | ||
57494343 DH |
35 | /* |
36 | * Do TCP-style congestion management [RFC 5681]. | |
37 | */ | |
38 | static void rxrpc_congestion_management(struct rxrpc_call *call, | |
39 | struct sk_buff *skb, | |
ed1e8679 DH |
40 | struct rxrpc_ack_summary *summary, |
41 | rxrpc_serial_t acked_serial) | |
57494343 DH |
42 | { |
43 | enum rxrpc_congest_change change = rxrpc_cong_no_change; | |
57494343 DH |
44 | unsigned int cumulative_acks = call->cong_cumul_acks; |
45 | unsigned int cwnd = call->cong_cwnd; | |
46 | bool resend = false; | |
47 | ||
48 | summary->flight_size = | |
49 | (call->tx_top - call->tx_hard_ack) - summary->nr_acks; | |
50 | ||
51 | if (test_and_clear_bit(RXRPC_CALL_RETRANS_TIMEOUT, &call->flags)) { | |
52 | summary->retrans_timeo = true; | |
53 | call->cong_ssthresh = max_t(unsigned int, | |
54 | summary->flight_size / 2, 2); | |
55 | cwnd = 1; | |
8782def2 | 56 | if (cwnd >= call->cong_ssthresh && |
57494343 DH |
57 | call->cong_mode == RXRPC_CALL_SLOW_START) { |
58 | call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE; | |
59 | call->cong_tstamp = skb->tstamp; | |
60 | cumulative_acks = 0; | |
61 | } | |
62 | } | |
63 | ||
64 | cumulative_acks += summary->nr_new_acks; | |
65 | cumulative_acks += summary->nr_rot_new_acks; | |
66 | if (cumulative_acks > 255) | |
67 | cumulative_acks = 255; | |
68 | ||
69 | summary->mode = call->cong_mode; | |
70 | summary->cwnd = call->cong_cwnd; | |
71 | summary->ssthresh = call->cong_ssthresh; | |
72 | summary->cumulative_acks = cumulative_acks; | |
73 | summary->dup_acks = call->cong_dup_acks; | |
74 | ||
75 | switch (call->cong_mode) { | |
76 | case RXRPC_CALL_SLOW_START: | |
77 | if (summary->nr_nacks > 0) | |
78 | goto packet_loss_detected; | |
79 | if (summary->cumulative_acks > 0) | |
80 | cwnd += 1; | |
8782def2 | 81 | if (cwnd >= call->cong_ssthresh) { |
57494343 DH |
82 | call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE; |
83 | call->cong_tstamp = skb->tstamp; | |
84 | } | |
85 | goto out; | |
86 | ||
87 | case RXRPC_CALL_CONGEST_AVOIDANCE: | |
88 | if (summary->nr_nacks > 0) | |
89 | goto packet_loss_detected; | |
90 | ||
91 | /* We analyse the number of packets that get ACK'd per RTT | |
92 | * period and increase the window if we managed to fill it. | |
93 | */ | |
c410bf01 | 94 | if (call->peer->rtt_count == 0) |
57494343 DH |
95 | goto out; |
96 | if (ktime_before(skb->tstamp, | |
c410bf01 DH |
97 | ktime_add_us(call->cong_tstamp, |
98 | call->peer->srtt_us >> 3))) | |
57494343 DH |
99 | goto out_no_clear_ca; |
100 | change = rxrpc_cong_rtt_window_end; | |
101 | call->cong_tstamp = skb->tstamp; | |
102 | if (cumulative_acks >= cwnd) | |
103 | cwnd++; | |
104 | goto out; | |
105 | ||
106 | case RXRPC_CALL_PACKET_LOSS: | |
107 | if (summary->nr_nacks == 0) | |
108 | goto resume_normality; | |
109 | ||
110 | if (summary->new_low_nack) { | |
111 | change = rxrpc_cong_new_low_nack; | |
112 | call->cong_dup_acks = 1; | |
113 | if (call->cong_extra > 1) | |
114 | call->cong_extra = 1; | |
115 | goto send_extra_data; | |
116 | } | |
117 | ||
118 | call->cong_dup_acks++; | |
119 | if (call->cong_dup_acks < 3) | |
120 | goto send_extra_data; | |
121 | ||
122 | change = rxrpc_cong_begin_retransmission; | |
123 | call->cong_mode = RXRPC_CALL_FAST_RETRANSMIT; | |
124 | call->cong_ssthresh = max_t(unsigned int, | |
125 | summary->flight_size / 2, 2); | |
126 | cwnd = call->cong_ssthresh + 3; | |
127 | call->cong_extra = 0; | |
128 | call->cong_dup_acks = 0; | |
129 | resend = true; | |
130 | goto out; | |
131 | ||
132 | case RXRPC_CALL_FAST_RETRANSMIT: | |
133 | if (!summary->new_low_nack) { | |
134 | if (summary->nr_new_acks == 0) | |
135 | cwnd += 1; | |
136 | call->cong_dup_acks++; | |
137 | if (call->cong_dup_acks == 2) { | |
138 | change = rxrpc_cong_retransmit_again; | |
139 | call->cong_dup_acks = 0; | |
140 | resend = true; | |
141 | } | |
142 | } else { | |
143 | change = rxrpc_cong_progress; | |
144 | cwnd = call->cong_ssthresh; | |
145 | if (summary->nr_nacks == 0) | |
146 | goto resume_normality; | |
147 | } | |
148 | goto out; | |
149 | ||
150 | default: | |
151 | BUG(); | |
152 | goto out; | |
153 | } | |
154 | ||
155 | resume_normality: | |
156 | change = rxrpc_cong_cleared_nacks; | |
157 | call->cong_dup_acks = 0; | |
158 | call->cong_extra = 0; | |
159 | call->cong_tstamp = skb->tstamp; | |
8782def2 | 160 | if (cwnd < call->cong_ssthresh) |
57494343 DH |
161 | call->cong_mode = RXRPC_CALL_SLOW_START; |
162 | else | |
163 | call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE; | |
164 | out: | |
165 | cumulative_acks = 0; | |
166 | out_no_clear_ca: | |
167 | if (cwnd >= RXRPC_RXTX_BUFF_SIZE - 1) | |
168 | cwnd = RXRPC_RXTX_BUFF_SIZE - 1; | |
169 | call->cong_cwnd = cwnd; | |
170 | call->cong_cumul_acks = cumulative_acks; | |
ed1e8679 | 171 | trace_rxrpc_congest(call, summary, acked_serial, change); |
57494343 DH |
172 | if (resend && !test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) |
173 | rxrpc_queue_call(call); | |
174 | return; | |
175 | ||
176 | packet_loss_detected: | |
177 | change = rxrpc_cong_saw_nack; | |
178 | call->cong_mode = RXRPC_CALL_PACKET_LOSS; | |
179 | call->cong_dup_acks = 0; | |
180 | goto send_extra_data; | |
181 | ||
182 | send_extra_data: | |
183 | /* Send some previously unsent DATA if we have some to advance the ACK | |
184 | * state. | |
185 | */ | |
186 | if (call->rxtx_annotations[call->tx_top & RXRPC_RXTX_BUFF_MASK] & | |
187 | RXRPC_TX_ANNO_LAST || | |
188 | summary->nr_acks != call->tx_top - call->tx_hard_ack) { | |
189 | call->cong_extra++; | |
190 | wake_up(&call->waitq); | |
191 | } | |
192 | goto out_no_clear_ca; | |
193 | } | |
194 | ||
17926a79 | 195 | /* |
248f219c | 196 | * Apply a hard ACK by advancing the Tx window. |
17926a79 | 197 | */ |
c479d5f2 | 198 | static bool rxrpc_rotate_tx_window(struct rxrpc_call *call, rxrpc_seq_t to, |
31a1b989 | 199 | struct rxrpc_ack_summary *summary) |
17926a79 | 200 | { |
248f219c | 201 | struct sk_buff *skb, *list = NULL; |
c479d5f2 | 202 | bool rot_last = false; |
248f219c | 203 | int ix; |
70790dbe | 204 | u8 annotation; |
17926a79 | 205 | |
31a1b989 DH |
206 | if (call->acks_lowest_nak == call->tx_hard_ack) { |
207 | call->acks_lowest_nak = to; | |
208 | } else if (before_eq(call->acks_lowest_nak, to)) { | |
209 | summary->new_low_nack = true; | |
210 | call->acks_lowest_nak = to; | |
211 | } | |
212 | ||
248f219c | 213 | spin_lock(&call->lock); |
17926a79 | 214 | |
248f219c DH |
215 | while (before(call->tx_hard_ack, to)) { |
216 | call->tx_hard_ack++; | |
217 | ix = call->tx_hard_ack & RXRPC_RXTX_BUFF_MASK; | |
218 | skb = call->rxtx_buffer[ix]; | |
70790dbe | 219 | annotation = call->rxtx_annotations[ix]; |
987db9f7 | 220 | rxrpc_see_skb(skb, rxrpc_skb_rotated); |
248f219c DH |
221 | call->rxtx_buffer[ix] = NULL; |
222 | call->rxtx_annotations[ix] = 0; | |
223 | skb->next = list; | |
224 | list = skb; | |
70790dbe | 225 | |
c479d5f2 | 226 | if (annotation & RXRPC_TX_ANNO_LAST) { |
70790dbe | 227 | set_bit(RXRPC_CALL_TX_LAST, &call->flags); |
c479d5f2 DH |
228 | rot_last = true; |
229 | } | |
31a1b989 DH |
230 | if ((annotation & RXRPC_TX_ANNO_MASK) != RXRPC_TX_ANNO_ACK) |
231 | summary->nr_rot_new_acks++; | |
248f219c | 232 | } |
17926a79 | 233 | |
248f219c | 234 | spin_unlock(&call->lock); |
17926a79 | 235 | |
c479d5f2 | 236 | trace_rxrpc_transmit(call, (rot_last ? |
70790dbe DH |
237 | rxrpc_transmit_rotate_last : |
238 | rxrpc_transmit_rotate)); | |
bc4abfcf DH |
239 | wake_up(&call->waitq); |
240 | ||
248f219c DH |
241 | while (list) { |
242 | skb = list; | |
243 | list = skb->next; | |
a8305bff | 244 | skb_mark_not_on_list(skb); |
987db9f7 | 245 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
17926a79 | 246 | } |
c479d5f2 DH |
247 | |
248 | return rot_last; | |
248f219c | 249 | } |
17926a79 | 250 | |
248f219c DH |
251 | /* |
252 | * End the transmission phase of a call. | |
253 | * | |
254 | * This occurs when we get an ACKALL packet, the first DATA packet of a reply, | |
255 | * or a final ACK packet. | |
256 | */ | |
70790dbe DH |
257 | static bool rxrpc_end_tx_phase(struct rxrpc_call *call, bool reply_begun, |
258 | const char *abort_why) | |
248f219c | 259 | { |
dfe99522 | 260 | unsigned int state; |
17926a79 | 261 | |
70790dbe | 262 | ASSERT(test_bit(RXRPC_CALL_TX_LAST, &call->flags)); |
17926a79 | 263 | |
248f219c | 264 | write_lock(&call->state_lock); |
651350d1 | 265 | |
dfe99522 DH |
266 | state = call->state; |
267 | switch (state) { | |
70790dbe | 268 | case RXRPC_CALL_CLIENT_SEND_REQUEST: |
248f219c | 269 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: |
70790dbe | 270 | if (reply_begun) |
dfe99522 | 271 | call->state = state = RXRPC_CALL_CLIENT_RECV_REPLY; |
70790dbe | 272 | else |
dfe99522 | 273 | call->state = state = RXRPC_CALL_CLIENT_AWAIT_REPLY; |
248f219c | 274 | break; |
70790dbe | 275 | |
248f219c DH |
276 | case RXRPC_CALL_SERVER_AWAIT_ACK: |
277 | __rxrpc_call_completed(call); | |
dfe99522 | 278 | state = call->state; |
248f219c | 279 | break; |
70790dbe DH |
280 | |
281 | default: | |
282 | goto bad_state; | |
17926a79 | 283 | } |
17926a79 | 284 | |
248f219c | 285 | write_unlock(&call->state_lock); |
dfe99522 | 286 | if (state == RXRPC_CALL_CLIENT_AWAIT_REPLY) |
70790dbe | 287 | trace_rxrpc_transmit(call, rxrpc_transmit_await_reply); |
dfe99522 | 288 | else |
70790dbe | 289 | trace_rxrpc_transmit(call, rxrpc_transmit_end); |
248f219c DH |
290 | _leave(" = ok"); |
291 | return true; | |
70790dbe DH |
292 | |
293 | bad_state: | |
294 | write_unlock(&call->state_lock); | |
295 | kdebug("end_tx %s", rxrpc_call_states[call->state]); | |
296 | rxrpc_proto_abort(abort_why, call, call->tx_top); | |
297 | return false; | |
298 | } | |
299 | ||
300 | /* | |
301 | * Begin the reply reception phase of a call. | |
302 | */ | |
303 | static bool rxrpc_receiving_reply(struct rxrpc_call *call) | |
304 | { | |
31a1b989 | 305 | struct rxrpc_ack_summary summary = { 0 }; |
a158bdd3 | 306 | unsigned long now, timo; |
70790dbe DH |
307 | rxrpc_seq_t top = READ_ONCE(call->tx_top); |
308 | ||
dd7c1ee5 DH |
309 | if (call->ackr_reason) { |
310 | spin_lock_bh(&call->lock); | |
311 | call->ackr_reason = 0; | |
dd7c1ee5 | 312 | spin_unlock_bh(&call->lock); |
a158bdd3 DH |
313 | now = jiffies; |
314 | timo = now + MAX_JIFFY_OFFSET; | |
315 | WRITE_ONCE(call->resend_at, timo); | |
316 | WRITE_ONCE(call->ack_at, timo); | |
317 | trace_rxrpc_timer(call, rxrpc_timer_init_for_reply, now); | |
dd7c1ee5 DH |
318 | } |
319 | ||
70790dbe | 320 | if (!test_bit(RXRPC_CALL_TX_LAST, &call->flags)) { |
c479d5f2 DH |
321 | if (!rxrpc_rotate_tx_window(call, top, &summary)) { |
322 | rxrpc_proto_abort("TXL", call, top); | |
323 | return false; | |
324 | } | |
70790dbe DH |
325 | } |
326 | if (!rxrpc_end_tx_phase(call, true, "ETD")) | |
327 | return false; | |
328 | call->tx_phase = false; | |
329 | return true; | |
248f219c DH |
330 | } |
331 | ||
332 | /* | |
c3c9e3df | 333 | * Scan a data packet to validate its structure and to work out how many |
248f219c DH |
334 | * subpackets it contains. |
335 | * | |
336 | * A jumbo packet is a collection of consecutive packets glued together with | |
337 | * little headers between that indicate how to change the initial header for | |
338 | * each subpacket. | |
339 | * | |
340 | * RXRPC_JUMBO_PACKET must be set on all but the last subpacket - and all but | |
341 | * the last are RXRPC_JUMBO_DATALEN in size. The last subpacket may be of any | |
342 | * size. | |
343 | */ | |
c3c9e3df | 344 | static bool rxrpc_validate_data(struct sk_buff *skb) |
248f219c DH |
345 | { |
346 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
775e5b71 | 347 | unsigned int offset = sizeof(struct rxrpc_wire_header); |
89a80ed4 | 348 | unsigned int len = skb->len; |
248f219c DH |
349 | u8 flags = sp->hdr.flags; |
350 | ||
c3c9e3df DH |
351 | for (;;) { |
352 | if (flags & RXRPC_REQUEST_ACK) | |
353 | __set_bit(sp->nr_subpackets, sp->rx_req_ack); | |
354 | sp->nr_subpackets++; | |
355 | ||
356 | if (!(flags & RXRPC_JUMBO_PACKET)) | |
357 | break; | |
358 | ||
248f219c DH |
359 | if (len - offset < RXRPC_JUMBO_SUBPKTLEN) |
360 | goto protocol_error; | |
361 | if (flags & RXRPC_LAST_PACKET) | |
362 | goto protocol_error; | |
363 | offset += RXRPC_JUMBO_DATALEN; | |
364 | if (skb_copy_bits(skb, offset, &flags, 1) < 0) | |
365 | goto protocol_error; | |
366 | offset += sizeof(struct rxrpc_jumbo_header); | |
c3c9e3df | 367 | } |
248f219c | 368 | |
c3c9e3df DH |
369 | if (flags & RXRPC_LAST_PACKET) |
370 | sp->rx_flags |= RXRPC_SKB_INCL_LAST; | |
248f219c | 371 | return true; |
17926a79 | 372 | |
248f219c DH |
373 | protocol_error: |
374 | return false; | |
17926a79 DH |
375 | } |
376 | ||
377 | /* | |
248f219c DH |
378 | * Handle reception of a duplicate packet. |
379 | * | |
380 | * We have to take care to avoid an attack here whereby we're given a series of | |
381 | * jumbograms, each with a sequence number one before the preceding one and | |
382 | * filled up to maximum UDP size. If they never send us the first packet in | |
383 | * the sequence, they can cause us to have to hold on to around 2MiB of kernel | |
384 | * space until the call times out. | |
385 | * | |
386 | * We limit the space usage by only accepting three duplicate jumbo packets per | |
387 | * call. After that, we tell the other side we're no longer accepting jumbos | |
388 | * (that information is encoded in the ACK packet). | |
17926a79 | 389 | */ |
248f219c | 390 | static void rxrpc_input_dup_data(struct rxrpc_call *call, rxrpc_seq_t seq, |
e2de6c40 | 391 | bool is_jumbo, bool *_jumbo_bad) |
17926a79 | 392 | { |
248f219c | 393 | /* Discard normal packets that are duplicates. */ |
e2de6c40 | 394 | if (is_jumbo) |
248f219c | 395 | return; |
17926a79 | 396 | |
248f219c DH |
397 | /* Skip jumbo subpackets that are duplicates. When we've had three or |
398 | * more partially duplicate jumbo packets, we refuse to take any more | |
399 | * jumbos for this call. | |
400 | */ | |
75e42126 DH |
401 | if (!*_jumbo_bad) { |
402 | call->nr_jumbo_bad++; | |
403 | *_jumbo_bad = true; | |
248f219c DH |
404 | } |
405 | } | |
17926a79 | 406 | |
248f219c | 407 | /* |
4858e403 DH |
408 | * Process a DATA packet, adding the packet to the Rx ring. The caller's |
409 | * packet ref must be passed on or discarded. | |
248f219c | 410 | */ |
e8c3af6b | 411 | static void rxrpc_input_data(struct rxrpc_call *call, struct sk_buff *skb) |
248f219c DH |
412 | { |
413 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
146d8fef | 414 | enum rxrpc_call_state state; |
122d74fa | 415 | unsigned int j, nr_subpackets; |
248f219c | 416 | rxrpc_serial_t serial = sp->hdr.serial, ack_serial = 0; |
e2de6c40 DH |
417 | rxrpc_seq_t seq0 = sp->hdr.seq, hard_ack; |
418 | bool immediate_ack = false, jumbo_bad = false; | |
419 | u8 ack = 0; | |
17926a79 | 420 | |
248f219c | 421 | _enter("{%u,%u},{%u,%u}", |
e2de6c40 | 422 | call->rx_hard_ack, call->rx_top, skb->len, seq0); |
17926a79 | 423 | |
e2de6c40 DH |
424 | _proto("Rx DATA %%%u { #%u f=%02x n=%u }", |
425 | sp->hdr.serial, seq0, sp->hdr.flags, sp->nr_subpackets); | |
17926a79 | 426 | |
146d8fef | 427 | state = READ_ONCE(call->state); |
4858e403 | 428 | if (state >= RXRPC_CALL_COMPLETE) { |
987db9f7 | 429 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
248f219c | 430 | return; |
4858e403 | 431 | } |
17926a79 | 432 | |
a95d25dd | 433 | if (state == RXRPC_CALL_SERVER_RECV_REQUEST) { |
a158bdd3 DH |
434 | unsigned long timo = READ_ONCE(call->next_req_timo); |
435 | unsigned long now, expect_req_by; | |
436 | ||
437 | if (timo) { | |
438 | now = jiffies; | |
439 | expect_req_by = now + timo; | |
440 | WRITE_ONCE(call->expect_req_by, expect_req_by); | |
441 | rxrpc_reduce_call_timer(call, expect_req_by, now, | |
442 | rxrpc_timer_set_for_idle); | |
443 | } | |
444 | } | |
445 | ||
c1e15b49 DH |
446 | spin_lock(&call->input_lock); |
447 | ||
248f219c DH |
448 | /* Received data implicitly ACKs all of the request packets we sent |
449 | * when we're acting as a client. | |
450 | */ | |
146d8fef DH |
451 | if ((state == RXRPC_CALL_CLIENT_SEND_REQUEST || |
452 | state == RXRPC_CALL_CLIENT_AWAIT_REPLY) && | |
70790dbe | 453 | !rxrpc_receiving_reply(call)) |
c1e15b49 | 454 | goto unlock; |
17926a79 | 455 | |
e2de6c40 | 456 | call->ackr_prev_seq = seq0; |
248f219c | 457 | hard_ack = READ_ONCE(call->rx_hard_ack); |
17926a79 | 458 | |
122d74fa DH |
459 | nr_subpackets = sp->nr_subpackets; |
460 | if (nr_subpackets > 1) { | |
75e42126 | 461 | if (call->nr_jumbo_bad > 3) { |
248f219c DH |
462 | ack = RXRPC_ACK_NOSPACE; |
463 | ack_serial = serial; | |
464 | goto ack; | |
17926a79 | 465 | } |
17926a79 DH |
466 | } |
467 | ||
122d74fa | 468 | for (j = 0; j < nr_subpackets; j++) { |
e2de6c40 DH |
469 | rxrpc_serial_t serial = sp->hdr.serial + j; |
470 | rxrpc_seq_t seq = seq0 + j; | |
471 | unsigned int ix = seq & RXRPC_RXTX_BUFF_MASK; | |
122d74fa | 472 | bool terminal = (j == nr_subpackets - 1); |
e2de6c40 DH |
473 | bool last = terminal && (sp->rx_flags & RXRPC_SKB_INCL_LAST); |
474 | u8 flags, annotation = j; | |
475 | ||
476 | _proto("Rx DATA+%u %%%u { #%x t=%u l=%u }", | |
477 | j, serial, seq, terminal, last); | |
478 | ||
479 | if (last) { | |
480 | if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) && | |
481 | seq != call->rx_top) { | |
482 | rxrpc_proto_abort("LSN", call, seq); | |
483 | goto unlock; | |
484 | } | |
485 | } else { | |
486 | if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) && | |
487 | after_eq(seq, call->rx_top)) { | |
488 | rxrpc_proto_abort("LSA", call, seq); | |
489 | goto unlock; | |
490 | } | |
c1e15b49 | 491 | } |
17926a79 | 492 | |
e2de6c40 DH |
493 | flags = 0; |
494 | if (last) | |
495 | flags |= RXRPC_LAST_PACKET; | |
496 | if (!terminal) | |
497 | flags |= RXRPC_JUMBO_PACKET; | |
498 | if (test_bit(j, sp->rx_req_ack)) | |
499 | flags |= RXRPC_REQUEST_ACK; | |
500 | trace_rxrpc_rx_data(call->debug_id, seq, serial, flags, annotation); | |
248f219c | 501 | |
e2de6c40 | 502 | if (before_eq(seq, hard_ack)) { |
248f219c DH |
503 | ack = RXRPC_ACK_DUPLICATE; |
504 | ack_serial = serial; | |
e2de6c40 | 505 | continue; |
17926a79 | 506 | } |
248f219c | 507 | |
e2de6c40 | 508 | if (call->rxtx_buffer[ix]) { |
122d74fa | 509 | rxrpc_input_dup_data(call, seq, nr_subpackets > 1, |
e2de6c40 DH |
510 | &jumbo_bad); |
511 | if (ack != RXRPC_ACK_DUPLICATE) { | |
512 | ack = RXRPC_ACK_DUPLICATE; | |
513 | ack_serial = serial; | |
514 | } | |
515 | immediate_ack = true; | |
516 | continue; | |
248f219c | 517 | } |
17926a79 | 518 | |
75e42126 DH |
519 | if (after(seq, hard_ack + call->rx_winsize)) { |
520 | ack = RXRPC_ACK_EXCEEDS_WINDOW; | |
521 | ack_serial = serial; | |
e2de6c40 DH |
522 | if (flags & RXRPC_JUMBO_PACKET) { |
523 | if (!jumbo_bad) { | |
524 | call->nr_jumbo_bad++; | |
525 | jumbo_bad = true; | |
526 | } | |
75e42126 | 527 | } |
e2de6c40 | 528 | |
75e42126 DH |
529 | goto ack; |
530 | } | |
248f219c | 531 | |
e2de6c40 DH |
532 | if (flags & RXRPC_REQUEST_ACK && !ack) { |
533 | ack = RXRPC_ACK_REQUESTED; | |
534 | ack_serial = serial; | |
535 | } | |
536 | ||
537 | /* Queue the packet. We use a couple of memory barriers here as need | |
538 | * to make sure that rx_top is perceived to be set after the buffer | |
539 | * pointer and that the buffer pointer is set after the annotation and | |
540 | * the skb data. | |
541 | * | |
542 | * Barriers against rxrpc_recvmsg_data() and rxrpc_rotate_rx_window() | |
543 | * and also rxrpc_fill_out_ack(). | |
544 | */ | |
4858e403 | 545 | if (!terminal) |
987db9f7 | 546 | rxrpc_get_skb(skb, rxrpc_skb_got); |
e2de6c40 DH |
547 | call->rxtx_annotations[ix] = annotation; |
548 | smp_wmb(); | |
549 | call->rxtx_buffer[ix] = skb; | |
550 | if (after(seq, call->rx_top)) { | |
551 | smp_store_release(&call->rx_top, seq); | |
552 | } else if (before(seq, call->rx_top)) { | |
553 | /* Send an immediate ACK if we fill in a hole */ | |
554 | if (!ack) { | |
555 | ack = RXRPC_ACK_DELAY; | |
556 | ack_serial = serial; | |
557 | } | |
558 | immediate_ack = true; | |
559 | } | |
560 | ||
561 | if (terminal) { | |
562 | /* From this point on, we're not allowed to touch the | |
563 | * packet any longer as its ref now belongs to the Rx | |
564 | * ring. | |
565 | */ | |
566 | skb = NULL; | |
122d74fa | 567 | sp = NULL; |
e2de6c40 DH |
568 | } |
569 | ||
570 | if (last) { | |
571 | set_bit(RXRPC_CALL_RX_LAST, &call->flags); | |
572 | if (!ack) { | |
573 | ack = RXRPC_ACK_DELAY; | |
574 | ack_serial = serial; | |
575 | } | |
576 | trace_rxrpc_receive(call, rxrpc_receive_queue_last, serial, seq); | |
577 | } else { | |
578 | trace_rxrpc_receive(call, rxrpc_receive_queue, serial, seq); | |
579 | } | |
17926a79 | 580 | |
e2de6c40 DH |
581 | if (after_eq(seq, call->rx_expect_next)) { |
582 | if (after(seq, call->rx_expect_next)) { | |
583 | _net("OOS %u > %u", seq, call->rx_expect_next); | |
584 | ack = RXRPC_ACK_OUT_OF_SEQUENCE; | |
585 | ack_serial = serial; | |
586 | } | |
587 | call->rx_expect_next = seq + 1; | |
588 | } | |
248f219c | 589 | } |
17926a79 | 590 | |
248f219c DH |
591 | ack: |
592 | if (ack) | |
e8c3af6b | 593 | rxrpc_propose_ACK(call, ack, ack_serial, |
9c7ad434 DH |
594 | immediate_ack, true, |
595 | rxrpc_propose_ack_input_data); | |
4764c0da | 596 | else |
e8c3af6b | 597 | rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, serial, |
4764c0da DH |
598 | false, true, |
599 | rxrpc_propose_ack_input_data); | |
17926a79 | 600 | |
f71dbf2f DH |
601 | trace_rxrpc_notify_socket(call->debug_id, serial); |
602 | rxrpc_notify_socket(call); | |
c1e15b49 DH |
603 | |
604 | unlock: | |
605 | spin_unlock(&call->input_lock); | |
987db9f7 | 606 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
248f219c | 607 | _leave(" [queued]"); |
17926a79 DH |
608 | } |
609 | ||
50235c4b | 610 | /* |
4700c4d8 | 611 | * See if there's a cached RTT probe to complete. |
50235c4b | 612 | */ |
4700c4d8 DH |
613 | static void rxrpc_complete_rtt_probe(struct rxrpc_call *call, |
614 | ktime_t resp_time, | |
615 | rxrpc_serial_t acked_serial, | |
616 | rxrpc_serial_t ack_serial, | |
617 | enum rxrpc_rtt_rx_trace type) | |
50235c4b | 618 | { |
4700c4d8 DH |
619 | rxrpc_serial_t orig_serial; |
620 | unsigned long avail; | |
50235c4b | 621 | ktime_t sent_at; |
4700c4d8 DH |
622 | bool matched = false; |
623 | int i; | |
50235c4b | 624 | |
4700c4d8 DH |
625 | avail = READ_ONCE(call->rtt_avail); |
626 | smp_rmb(); /* Read avail bits before accessing data. */ | |
50235c4b | 627 | |
4700c4d8 DH |
628 | for (i = 0; i < ARRAY_SIZE(call->rtt_serial); i++) { |
629 | if (!test_bit(i + RXRPC_CALL_RTT_PEND_SHIFT, &avail)) | |
50235c4b | 630 | continue; |
b604dd98 | 631 | |
4700c4d8 DH |
632 | sent_at = call->rtt_sent_at[i]; |
633 | orig_serial = call->rtt_serial[i]; | |
634 | ||
635 | if (orig_serial == acked_serial) { | |
636 | clear_bit(i + RXRPC_CALL_RTT_PEND_SHIFT, &call->rtt_avail); | |
637 | smp_mb(); /* Read data before setting avail bit */ | |
638 | set_bit(i, &call->rtt_avail); | |
639 | if (type != rxrpc_rtt_rx_cancel) | |
640 | rxrpc_peer_add_rtt(call, type, i, acked_serial, ack_serial, | |
641 | sent_at, resp_time); | |
642 | else | |
643 | trace_rxrpc_rtt_rx(call, rxrpc_rtt_rx_cancel, i, | |
644 | orig_serial, acked_serial, 0, 0); | |
645 | matched = true; | |
646 | } | |
647 | ||
648 | /* If a later serial is being acked, then mark this slot as | |
649 | * being available. | |
650 | */ | |
651 | if (after(acked_serial, orig_serial)) { | |
652 | trace_rxrpc_rtt_rx(call, rxrpc_rtt_rx_obsolete, i, | |
653 | orig_serial, acked_serial, 0, 0); | |
654 | clear_bit(i + RXRPC_CALL_RTT_PEND_SHIFT, &call->rtt_avail); | |
655 | smp_wmb(); | |
656 | set_bit(i, &call->rtt_avail); | |
657 | } | |
658 | } | |
50235c4b | 659 | |
4700c4d8 DH |
660 | if (!matched) |
661 | trace_rxrpc_rtt_rx(call, rxrpc_rtt_rx_lost, 9, 0, acked_serial, 0, 0); | |
50235c4b DH |
662 | } |
663 | ||
bd1fdf8c DH |
664 | /* |
665 | * Process the response to a ping that we sent to find out if we lost an ACK. | |
666 | * | |
667 | * If we got back a ping response that indicates a lower tx_top than what we | |
668 | * had at the time of the ping transmission, we adjudge all the DATA packets | |
669 | * sent between the response tx_top and the ping-time tx_top to have been lost. | |
670 | */ | |
671 | static void rxrpc_input_check_for_lost_ack(struct rxrpc_call *call) | |
672 | { | |
673 | rxrpc_seq_t top, bottom, seq; | |
674 | bool resend = false; | |
675 | ||
676 | spin_lock_bh(&call->lock); | |
677 | ||
678 | bottom = call->tx_hard_ack + 1; | |
679 | top = call->acks_lost_top; | |
680 | if (before(bottom, top)) { | |
681 | for (seq = bottom; before_eq(seq, top); seq++) { | |
682 | int ix = seq & RXRPC_RXTX_BUFF_MASK; | |
683 | u8 annotation = call->rxtx_annotations[ix]; | |
684 | u8 anno_type = annotation & RXRPC_TX_ANNO_MASK; | |
685 | ||
686 | if (anno_type != RXRPC_TX_ANNO_UNACK) | |
687 | continue; | |
688 | annotation &= ~RXRPC_TX_ANNO_MASK; | |
689 | annotation |= RXRPC_TX_ANNO_RETRANS; | |
690 | call->rxtx_annotations[ix] = annotation; | |
691 | resend = true; | |
692 | } | |
693 | } | |
694 | ||
695 | spin_unlock_bh(&call->lock); | |
696 | ||
697 | if (resend && !test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) | |
698 | rxrpc_queue_call(call); | |
699 | } | |
700 | ||
8e83134d DH |
701 | /* |
702 | * Process a ping response. | |
703 | */ | |
704 | static void rxrpc_input_ping_response(struct rxrpc_call *call, | |
705 | ktime_t resp_time, | |
4700c4d8 | 706 | rxrpc_serial_t acked_serial, |
8e83134d DH |
707 | rxrpc_serial_t ack_serial) |
708 | { | |
4700c4d8 | 709 | if (acked_serial == call->acks_lost_ping) |
bd1fdf8c | 710 | rxrpc_input_check_for_lost_ack(call); |
8e83134d DH |
711 | } |
712 | ||
17926a79 | 713 | /* |
248f219c | 714 | * Process the extra information that may be appended to an ACK packet |
17926a79 | 715 | */ |
248f219c DH |
716 | static void rxrpc_input_ackinfo(struct rxrpc_call *call, struct sk_buff *skb, |
717 | struct rxrpc_ackinfo *ackinfo) | |
17926a79 | 718 | { |
248f219c DH |
719 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
720 | struct rxrpc_peer *peer; | |
721 | unsigned int mtu; | |
702f2ac8 | 722 | bool wake = false; |
01fd0742 | 723 | u32 rwind = ntohl(ackinfo->rwind); |
248f219c DH |
724 | |
725 | _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }", | |
726 | sp->hdr.serial, | |
727 | ntohl(ackinfo->rxMTU), ntohl(ackinfo->maxMTU), | |
01fd0742 | 728 | rwind, ntohl(ackinfo->jumbo_max)); |
248f219c | 729 | |
a2ad7c21 DH |
730 | if (rwind > RXRPC_RXTX_BUFF_SIZE - 1) |
731 | rwind = RXRPC_RXTX_BUFF_SIZE - 1; | |
702f2ac8 | 732 | if (call->tx_winsize != rwind) { |
702f2ac8 DH |
733 | if (rwind > call->tx_winsize) |
734 | wake = true; | |
a2ad7c21 | 735 | trace_rxrpc_rx_rwind_change(call, sp->hdr.serial, rwind, wake); |
702f2ac8 DH |
736 | call->tx_winsize = rwind; |
737 | } | |
738 | ||
08511150 DH |
739 | if (call->cong_ssthresh > rwind) |
740 | call->cong_ssthresh = rwind; | |
248f219c DH |
741 | |
742 | mtu = min(ntohl(ackinfo->rxMTU), ntohl(ackinfo->maxMTU)); | |
743 | ||
744 | peer = call->peer; | |
745 | if (mtu < peer->maxdata) { | |
746 | spin_lock_bh(&peer->lock); | |
747 | peer->maxdata = mtu; | |
748 | peer->mtu = mtu + peer->hdrsize; | |
749 | spin_unlock_bh(&peer->lock); | |
750 | _net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata); | |
751 | } | |
702f2ac8 DH |
752 | |
753 | if (wake) | |
754 | wake_up(&call->waitq); | |
248f219c | 755 | } |
17926a79 | 756 | |
248f219c DH |
757 | /* |
758 | * Process individual soft ACKs. | |
759 | * | |
760 | * Each ACK in the array corresponds to one packet and can be either an ACK or | |
761 | * a NAK. If we get find an explicitly NAK'd packet we resend immediately; | |
762 | * packets that lie beyond the end of the ACK list are scheduled for resend by | |
763 | * the timer on the basis that the peer might just not have processed them at | |
764 | * the time the ACK was sent. | |
765 | */ | |
766 | static void rxrpc_input_soft_acks(struct rxrpc_call *call, u8 *acks, | |
31a1b989 DH |
767 | rxrpc_seq_t seq, int nr_acks, |
768 | struct rxrpc_ack_summary *summary) | |
248f219c | 769 | { |
248f219c | 770 | int ix; |
f07373ea | 771 | u8 annotation, anno_type; |
248f219c DH |
772 | |
773 | for (; nr_acks > 0; nr_acks--, seq++) { | |
774 | ix = seq & RXRPC_RXTX_BUFF_MASK; | |
f07373ea DH |
775 | annotation = call->rxtx_annotations[ix]; |
776 | anno_type = annotation & RXRPC_TX_ANNO_MASK; | |
777 | annotation &= ~RXRPC_TX_ANNO_MASK; | |
d01dc4c3 | 778 | switch (*acks++) { |
248f219c | 779 | case RXRPC_ACK_TYPE_ACK: |
31a1b989 | 780 | summary->nr_acks++; |
f07373ea DH |
781 | if (anno_type == RXRPC_TX_ANNO_ACK) |
782 | continue; | |
31a1b989 | 783 | summary->nr_new_acks++; |
f07373ea DH |
784 | call->rxtx_annotations[ix] = |
785 | RXRPC_TX_ANNO_ACK | annotation; | |
248f219c DH |
786 | break; |
787 | case RXRPC_ACK_TYPE_NACK: | |
31a1b989 DH |
788 | if (!summary->nr_nacks && |
789 | call->acks_lowest_nak != seq) { | |
790 | call->acks_lowest_nak = seq; | |
791 | summary->new_low_nack = true; | |
792 | } | |
793 | summary->nr_nacks++; | |
f07373ea | 794 | if (anno_type == RXRPC_TX_ANNO_NAK) |
248f219c | 795 | continue; |
31a1b989 | 796 | summary->nr_new_nacks++; |
be8aa338 DH |
797 | if (anno_type == RXRPC_TX_ANNO_RETRANS) |
798 | continue; | |
f07373ea DH |
799 | call->rxtx_annotations[ix] = |
800 | RXRPC_TX_ANNO_NAK | annotation; | |
248f219c DH |
801 | break; |
802 | default: | |
803 | return rxrpc_proto_abort("SFT", call, 0); | |
17926a79 | 804 | } |
17926a79 DH |
805 | } |
806 | } | |
807 | ||
441fdee1 DH |
808 | /* |
809 | * Return true if the ACK is valid - ie. it doesn't appear to have regressed | |
810 | * with respect to the ack state conveyed by preceding ACKs. | |
811 | */ | |
812 | static bool rxrpc_is_ack_valid(struct rxrpc_call *call, | |
813 | rxrpc_seq_t first_pkt, rxrpc_seq_t prev_pkt) | |
814 | { | |
815 | rxrpc_seq_t base = READ_ONCE(call->ackr_first_seq); | |
816 | ||
817 | if (after(first_pkt, base)) | |
818 | return true; /* The window advanced */ | |
819 | ||
820 | if (before(first_pkt, base)) | |
821 | return false; /* firstPacket regressed */ | |
822 | ||
823 | if (after_eq(prev_pkt, call->ackr_prev_seq)) | |
824 | return true; /* previousPacket hasn't regressed. */ | |
825 | ||
826 | /* Some rx implementations put a serial number in previousPacket. */ | |
827 | if (after_eq(prev_pkt, base + call->tx_winsize)) | |
828 | return false; | |
829 | return true; | |
830 | } | |
831 | ||
17926a79 | 832 | /* |
248f219c DH |
833 | * Process an ACK packet. |
834 | * | |
835 | * ack.firstPacket is the sequence number of the first soft-ACK'd/NAK'd packet | |
836 | * in the ACK array. Anything before that is hard-ACK'd and may be discarded. | |
837 | * | |
838 | * A hard-ACK means that a packet has been processed and may be discarded; a | |
839 | * soft-ACK means that the packet may be discarded and retransmission | |
840 | * requested. A phase is complete when all packets are hard-ACK'd. | |
17926a79 | 841 | */ |
e8c3af6b | 842 | static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb) |
17926a79 | 843 | { |
31a1b989 | 844 | struct rxrpc_ack_summary summary = { 0 }; |
17926a79 | 845 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
248f219c DH |
846 | union { |
847 | struct rxrpc_ackpacket ack; | |
848 | struct rxrpc_ackinfo info; | |
849 | u8 acks[RXRPC_MAXACKS]; | |
850 | } buf; | |
68528d93 | 851 | rxrpc_serial_t ack_serial, acked_serial; |
1a2391c3 | 852 | rxrpc_seq_t first_soft_ack, hard_ack, prev_pkt; |
775e5b71 | 853 | int nr_acks, offset, ioffset; |
248f219c DH |
854 | |
855 | _enter(""); | |
856 | ||
775e5b71 DH |
857 | offset = sizeof(struct rxrpc_wire_header); |
858 | if (skb_copy_bits(skb, offset, &buf.ack, sizeof(buf.ack)) < 0) { | |
248f219c DH |
859 | _debug("extraction failure"); |
860 | return rxrpc_proto_abort("XAK", call, 0); | |
17926a79 | 861 | } |
775e5b71 | 862 | offset += sizeof(buf.ack); |
248f219c | 863 | |
68528d93 | 864 | ack_serial = sp->hdr.serial; |
8e83134d | 865 | acked_serial = ntohl(buf.ack.serial); |
248f219c | 866 | first_soft_ack = ntohl(buf.ack.firstPacket); |
1a2391c3 | 867 | prev_pkt = ntohl(buf.ack.previousPacket); |
248f219c DH |
868 | hard_ack = first_soft_ack - 1; |
869 | nr_acks = buf.ack.nAcks; | |
31a1b989 DH |
870 | summary.ack_reason = (buf.ack.reason < RXRPC_ACK__INVALID ? |
871 | buf.ack.reason : RXRPC_ACK__INVALID); | |
248f219c | 872 | |
68528d93 | 873 | trace_rxrpc_rx_ack(call, ack_serial, acked_serial, |
1a2391c3 | 874 | first_soft_ack, prev_pkt, |
b1d9f7fd | 875 | summary.ack_reason, nr_acks); |
ec71eb9a | 876 | |
4700c4d8 DH |
877 | switch (buf.ack.reason) { |
878 | case RXRPC_ACK_PING_RESPONSE: | |
8e83134d | 879 | rxrpc_input_ping_response(call, skb->tstamp, acked_serial, |
68528d93 | 880 | ack_serial); |
4700c4d8 DH |
881 | rxrpc_complete_rtt_probe(call, skb->tstamp, acked_serial, ack_serial, |
882 | rxrpc_rtt_rx_ping_response); | |
883 | break; | |
884 | case RXRPC_ACK_REQUESTED: | |
885 | rxrpc_complete_rtt_probe(call, skb->tstamp, acked_serial, ack_serial, | |
886 | rxrpc_rtt_rx_requested_ack); | |
887 | break; | |
888 | default: | |
889 | if (acked_serial != 0) | |
890 | rxrpc_complete_rtt_probe(call, skb->tstamp, acked_serial, ack_serial, | |
891 | rxrpc_rtt_rx_cancel); | |
892 | break; | |
893 | } | |
8e83134d | 894 | |
248f219c | 895 | if (buf.ack.reason == RXRPC_ACK_PING) { |
68528d93 | 896 | _proto("Rx ACK %%%u PING Request", ack_serial); |
248f219c | 897 | rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE, |
68528d93 | 898 | ack_serial, true, true, |
9c7ad434 | 899 | rxrpc_propose_ack_respond_to_ping); |
248f219c | 900 | } else if (sp->hdr.flags & RXRPC_REQUEST_ACK) { |
563ea7d5 | 901 | rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, |
68528d93 | 902 | ack_serial, true, true, |
9c7ad434 | 903 | rxrpc_propose_ack_respond_to_ack); |
17926a79 DH |
904 | } |
905 | ||
1a2391c3 | 906 | /* Discard any out-of-order or duplicate ACKs (outside lock). */ |
441fdee1 | 907 | if (!rxrpc_is_ack_valid(call, first_soft_ack, prev_pkt)) { |
68528d93 | 908 | trace_rxrpc_rx_discard_ack(call->debug_id, ack_serial, |
d1f12947 DH |
909 | first_soft_ack, call->ackr_first_seq, |
910 | prev_pkt, call->ackr_prev_seq); | |
298bc15b | 911 | return; |
d1f12947 | 912 | } |
c1e15b49 DH |
913 | |
914 | buf.info.rxMTU = 0; | |
775e5b71 | 915 | ioffset = offset + nr_acks + 3; |
c1e15b49 DH |
916 | if (skb->len >= ioffset + sizeof(buf.info) && |
917 | skb_copy_bits(skb, ioffset, &buf.info, sizeof(buf.info)) < 0) | |
918 | return rxrpc_proto_abort("XAI", call, 0); | |
919 | ||
920 | spin_lock(&call->input_lock); | |
921 | ||
1a2391c3 | 922 | /* Discard any out-of-order or duplicate ACKs (inside lock). */ |
441fdee1 | 923 | if (!rxrpc_is_ack_valid(call, first_soft_ack, prev_pkt)) { |
68528d93 | 924 | trace_rxrpc_rx_discard_ack(call->debug_id, ack_serial, |
d1f12947 DH |
925 | first_soft_ack, call->ackr_first_seq, |
926 | prev_pkt, call->ackr_prev_seq); | |
c1e15b49 | 927 | goto out; |
d1f12947 | 928 | } |
298bc15b | 929 | call->acks_latest_ts = skb->tstamp; |
298bc15b | 930 | |
1a2391c3 JA |
931 | call->ackr_first_seq = first_soft_ack; |
932 | call->ackr_prev_seq = prev_pkt; | |
933 | ||
298bc15b | 934 | /* Parse rwind and mtu sizes if provided. */ |
c1e15b49 | 935 | if (buf.info.rxMTU) |
248f219c | 936 | rxrpc_input_ackinfo(call, skb, &buf.info); |
17926a79 | 937 | |
c1e15b49 DH |
938 | if (first_soft_ack == 0) { |
939 | rxrpc_proto_abort("AK0", call, 0); | |
940 | goto out; | |
941 | } | |
17926a79 | 942 | |
248f219c | 943 | /* Ignore ACKs unless we are or have just been transmitting. */ |
146d8fef | 944 | switch (READ_ONCE(call->state)) { |
248f219c DH |
945 | case RXRPC_CALL_CLIENT_SEND_REQUEST: |
946 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
947 | case RXRPC_CALL_SERVER_SEND_REPLY: | |
948 | case RXRPC_CALL_SERVER_AWAIT_ACK: | |
949 | break; | |
17926a79 | 950 | default: |
c1e15b49 | 951 | goto out; |
248f219c | 952 | } |
17926a79 | 953 | |
248f219c | 954 | if (before(hard_ack, call->tx_hard_ack) || |
c1e15b49 DH |
955 | after(hard_ack, call->tx_top)) { |
956 | rxrpc_proto_abort("AKW", call, 0); | |
957 | goto out; | |
958 | } | |
959 | if (nr_acks > call->tx_top - hard_ack) { | |
960 | rxrpc_proto_abort("AKN", call, 0); | |
961 | goto out; | |
962 | } | |
17926a79 | 963 | |
c479d5f2 DH |
964 | if (after(hard_ack, call->tx_hard_ack)) { |
965 | if (rxrpc_rotate_tx_window(call, hard_ack, &summary)) { | |
966 | rxrpc_end_tx_phase(call, false, "ETA"); | |
c1e15b49 | 967 | goto out; |
c479d5f2 DH |
968 | } |
969 | } | |
17926a79 | 970 | |
70790dbe | 971 | if (nr_acks > 0) { |
c1e15b49 DH |
972 | if (skb_copy_bits(skb, offset, buf.acks, nr_acks) < 0) { |
973 | rxrpc_proto_abort("XSA", call, 0); | |
974 | goto out; | |
975 | } | |
31a1b989 DH |
976 | rxrpc_input_soft_acks(call, buf.acks, first_soft_ack, nr_acks, |
977 | &summary); | |
70790dbe DH |
978 | } |
979 | ||
0d967960 DH |
980 | if (call->rxtx_annotations[call->tx_top & RXRPC_RXTX_BUFF_MASK] & |
981 | RXRPC_TX_ANNO_LAST && | |
a9f312d9 DH |
982 | summary.nr_acks == call->tx_top - hard_ack && |
983 | rxrpc_is_client_call(call)) | |
68528d93 | 984 | rxrpc_propose_ACK(call, RXRPC_ACK_PING, ack_serial, |
0d967960 DH |
985 | false, true, |
986 | rxrpc_propose_ack_ping_for_lost_reply); | |
57494343 | 987 | |
c1e15b49 DH |
988 | rxrpc_congestion_management(call, skb, &summary, acked_serial); |
989 | out: | |
990 | spin_unlock(&call->input_lock); | |
17926a79 DH |
991 | } |
992 | ||
993 | /* | |
248f219c | 994 | * Process an ACKALL packet. |
17926a79 | 995 | */ |
248f219c | 996 | static void rxrpc_input_ackall(struct rxrpc_call *call, struct sk_buff *skb) |
17926a79 | 997 | { |
31a1b989 | 998 | struct rxrpc_ack_summary summary = { 0 }; |
248f219c | 999 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
17926a79 | 1000 | |
248f219c | 1001 | _proto("Rx ACKALL %%%u", sp->hdr.serial); |
17926a79 | 1002 | |
c1e15b49 DH |
1003 | spin_lock(&call->input_lock); |
1004 | ||
c479d5f2 | 1005 | if (rxrpc_rotate_tx_window(call, call->tx_top, &summary)) |
70790dbe | 1006 | rxrpc_end_tx_phase(call, false, "ETL"); |
c1e15b49 DH |
1007 | |
1008 | spin_unlock(&call->input_lock); | |
248f219c | 1009 | } |
17926a79 | 1010 | |
248f219c | 1011 | /* |
005ede28 | 1012 | * Process an ABORT packet directed at a call. |
248f219c DH |
1013 | */ |
1014 | static void rxrpc_input_abort(struct rxrpc_call *call, struct sk_buff *skb) | |
1015 | { | |
1016 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
1017 | __be32 wtmp; | |
1018 | u32 abort_code = RX_CALL_DEAD; | |
17926a79 | 1019 | |
248f219c | 1020 | _enter(""); |
17926a79 | 1021 | |
248f219c | 1022 | if (skb->len >= 4 && |
775e5b71 DH |
1023 | skb_copy_bits(skb, sizeof(struct rxrpc_wire_header), |
1024 | &wtmp, sizeof(wtmp)) >= 0) | |
248f219c | 1025 | abort_code = ntohl(wtmp); |
17926a79 | 1026 | |
005ede28 DH |
1027 | trace_rxrpc_rx_abort(call, sp->hdr.serial, abort_code); |
1028 | ||
248f219c | 1029 | _proto("Rx ABORT %%%u { %x }", sp->hdr.serial, abort_code); |
17926a79 | 1030 | |
5ac0d622 DH |
1031 | rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED, |
1032 | abort_code, -ECONNABORTED); | |
17926a79 DH |
1033 | } |
1034 | ||
1035 | /* | |
248f219c | 1036 | * Process an incoming call packet. |
17926a79 | 1037 | */ |
248f219c | 1038 | static void rxrpc_input_call_packet(struct rxrpc_call *call, |
e8c3af6b | 1039 | struct sk_buff *skb) |
17926a79 | 1040 | { |
248f219c | 1041 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
a158bdd3 | 1042 | unsigned long timo; |
17926a79 | 1043 | |
7727640c | 1044 | _enter("%p,%p", call, skb); |
17926a79 | 1045 | |
a158bdd3 DH |
1046 | timo = READ_ONCE(call->next_rx_timo); |
1047 | if (timo) { | |
1048 | unsigned long now = jiffies, expect_rx_by; | |
1049 | ||
c54e43d7 | 1050 | expect_rx_by = now + timo; |
a158bdd3 DH |
1051 | WRITE_ONCE(call->expect_rx_by, expect_rx_by); |
1052 | rxrpc_reduce_call_timer(call, expect_rx_by, now, | |
1053 | rxrpc_timer_set_for_normal); | |
1054 | } | |
3d7682af | 1055 | |
248f219c DH |
1056 | switch (sp->hdr.type) { |
1057 | case RXRPC_PACKET_TYPE_DATA: | |
e8c3af6b | 1058 | rxrpc_input_data(call, skb); |
4858e403 | 1059 | goto no_free; |
f5c17aae | 1060 | |
248f219c | 1061 | case RXRPC_PACKET_TYPE_ACK: |
e8c3af6b | 1062 | rxrpc_input_ack(call, skb); |
17926a79 | 1063 | break; |
17926a79 | 1064 | |
248f219c DH |
1065 | case RXRPC_PACKET_TYPE_BUSY: |
1066 | _proto("Rx BUSY %%%u", sp->hdr.serial); | |
17926a79 | 1067 | |
248f219c DH |
1068 | /* Just ignore BUSY packets from the server; the retry and |
1069 | * lifespan timers will take care of business. BUSY packets | |
1070 | * from the client don't make sense. | |
1071 | */ | |
1072 | break; | |
17926a79 | 1073 | |
248f219c DH |
1074 | case RXRPC_PACKET_TYPE_ABORT: |
1075 | rxrpc_input_abort(call, skb); | |
1076 | break; | |
17926a79 | 1077 | |
248f219c DH |
1078 | case RXRPC_PACKET_TYPE_ACKALL: |
1079 | rxrpc_input_ackall(call, skb); | |
1080 | break; | |
f5c17aae | 1081 | |
248f219c | 1082 | default: |
248f219c | 1083 | break; |
17926a79 | 1084 | } |
248f219c | 1085 | |
987db9f7 | 1086 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
4858e403 | 1087 | no_free: |
17926a79 DH |
1088 | _leave(""); |
1089 | } | |
1090 | ||
b3156274 | 1091 | /* |
c1e15b49 DH |
1092 | * Handle a new service call on a channel implicitly completing the preceding |
1093 | * call on that channel. This does not apply to client conns. | |
b3156274 DH |
1094 | * |
1095 | * TODO: If callNumber > call_id + 1, renegotiate security. | |
1096 | */ | |
c1e15b49 DH |
1097 | static void rxrpc_input_implicit_end_call(struct rxrpc_sock *rx, |
1098 | struct rxrpc_connection *conn, | |
b3156274 DH |
1099 | struct rxrpc_call *call) |
1100 | { | |
146d8fef | 1101 | switch (READ_ONCE(call->state)) { |
b3156274 DH |
1102 | case RXRPC_CALL_SERVER_AWAIT_ACK: |
1103 | rxrpc_call_completed(call); | |
df561f66 | 1104 | fallthrough; |
b3156274 DH |
1105 | case RXRPC_CALL_COMPLETE: |
1106 | break; | |
1107 | default: | |
3a92789a | 1108 | if (rxrpc_abort_call("IMP", call, 0, RX_CALL_DEAD, -ESHUTDOWN)) { |
b3156274 DH |
1109 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
1110 | rxrpc_queue_call(call); | |
1111 | } | |
c1e15b49 | 1112 | trace_rxrpc_improper_term(call); |
b3156274 DH |
1113 | break; |
1114 | } | |
1115 | ||
c1e15b49 | 1116 | spin_lock(&rx->incoming_lock); |
b3156274 | 1117 | __rxrpc_disconnect_call(conn, call); |
c1e15b49 | 1118 | spin_unlock(&rx->incoming_lock); |
b3156274 DH |
1119 | } |
1120 | ||
17926a79 DH |
1121 | /* |
1122 | * post connection-level events to the connection | |
18bfeba5 DH |
1123 | * - this includes challenges, responses, some aborts and call terminal packet |
1124 | * retransmission. | |
17926a79 | 1125 | */ |
2e7e9758 | 1126 | static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn, |
17926a79 DH |
1127 | struct sk_buff *skb) |
1128 | { | |
1129 | _enter("%p,%p", conn, skb); | |
1130 | ||
17926a79 | 1131 | skb_queue_tail(&conn->rx_queue, skb); |
2e7e9758 | 1132 | rxrpc_queue_conn(conn); |
17926a79 DH |
1133 | } |
1134 | ||
44ba0698 DH |
1135 | /* |
1136 | * post endpoint-level events to the local endpoint | |
1137 | * - this includes debug and version messages | |
1138 | */ | |
1139 | static void rxrpc_post_packet_to_local(struct rxrpc_local *local, | |
1140 | struct sk_buff *skb) | |
1141 | { | |
1142 | _enter("%p,%p", local, skb); | |
1143 | ||
730c5fd4 DH |
1144 | if (rxrpc_get_local_maybe(local)) { |
1145 | skb_queue_tail(&local->event_queue, skb); | |
1146 | rxrpc_queue_local(local); | |
1147 | } else { | |
987db9f7 | 1148 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
730c5fd4 | 1149 | } |
44ba0698 DH |
1150 | } |
1151 | ||
248f219c DH |
1152 | /* |
1153 | * put a packet up for transport-level abort | |
1154 | */ | |
1155 | static void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb) | |
1156 | { | |
1157 | CHECK_SLAB_OKAY(&local->usage); | |
1158 | ||
730c5fd4 DH |
1159 | if (rxrpc_get_local_maybe(local)) { |
1160 | skb_queue_tail(&local->reject_queue, skb); | |
1161 | rxrpc_queue_local(local); | |
1162 | } else { | |
987db9f7 | 1163 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
730c5fd4 | 1164 | } |
248f219c DH |
1165 | } |
1166 | ||
0d12f8a4 DH |
1167 | /* |
1168 | * Extract the wire header from a packet and translate the byte order. | |
1169 | */ | |
1170 | static noinline | |
1171 | int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb) | |
1172 | { | |
1173 | struct rxrpc_wire_header whdr; | |
1174 | ||
1175 | /* dig out the RxRPC connection details */ | |
fb46f6ee DH |
1176 | if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0) { |
1177 | trace_rxrpc_rx_eproto(NULL, sp->hdr.serial, | |
1178 | tracepoint_string("bad_hdr")); | |
0d12f8a4 | 1179 | return -EBADMSG; |
fb46f6ee | 1180 | } |
0d12f8a4 DH |
1181 | |
1182 | memset(sp, 0, sizeof(*sp)); | |
1183 | sp->hdr.epoch = ntohl(whdr.epoch); | |
1184 | sp->hdr.cid = ntohl(whdr.cid); | |
1185 | sp->hdr.callNumber = ntohl(whdr.callNumber); | |
1186 | sp->hdr.seq = ntohl(whdr.seq); | |
1187 | sp->hdr.serial = ntohl(whdr.serial); | |
1188 | sp->hdr.flags = whdr.flags; | |
1189 | sp->hdr.type = whdr.type; | |
1190 | sp->hdr.userStatus = whdr.userStatus; | |
1191 | sp->hdr.securityIndex = whdr.securityIndex; | |
1192 | sp->hdr._rsvd = ntohs(whdr._rsvd); | |
1193 | sp->hdr.serviceId = ntohs(whdr.serviceId); | |
1194 | return 0; | |
1195 | } | |
1196 | ||
17926a79 DH |
1197 | /* |
1198 | * handle data received on the local endpoint | |
1199 | * - may be called in interrupt context | |
4f95dd78 | 1200 | * |
032be5f1 ED |
1201 | * [!] Note that as this is called from the encap_rcv hook, the socket is not |
1202 | * held locked by the caller and nothing prevents sk_user_data on the UDP from | |
1203 | * being cleared in the middle of processing this function. | |
bfd28211 DH |
1204 | * |
1205 | * Called with the RCU read lock held from the IP layer via UDP. | |
17926a79 | 1206 | */ |
5271953c | 1207 | int rxrpc_input_packet(struct sock *udp_sk, struct sk_buff *skb) |
17926a79 | 1208 | { |
032be5f1 | 1209 | struct rxrpc_local *local = rcu_dereference_sk_user_data(udp_sk); |
8496af50 | 1210 | struct rxrpc_connection *conn; |
248f219c | 1211 | struct rxrpc_channel *chan; |
403fc2a1 | 1212 | struct rxrpc_call *call = NULL; |
17926a79 | 1213 | struct rxrpc_skb_priv *sp; |
0099dc58 DH |
1214 | struct rxrpc_peer *peer = NULL; |
1215 | struct rxrpc_sock *rx = NULL; | |
248f219c | 1216 | unsigned int channel; |
17926a79 | 1217 | |
248f219c | 1218 | _enter("%p", udp_sk); |
17926a79 | 1219 | |
032be5f1 ED |
1220 | if (unlikely(!local)) { |
1221 | kfree_skb(skb); | |
1222 | return 0; | |
1223 | } | |
b604dd98 DH |
1224 | if (skb->tstamp == 0) |
1225 | skb->tstamp = ktime_get_real(); | |
1226 | ||
987db9f7 | 1227 | rxrpc_new_skb(skb, rxrpc_skb_received); |
17926a79 | 1228 | |
5271953c | 1229 | skb_pull(skb, sizeof(struct udphdr)); |
1781f7f5 | 1230 | |
7c13f97f PA |
1231 | /* The UDP protocol already released all skb resources; |
1232 | * we are free to add our own data there. | |
0d12f8a4 | 1233 | */ |
17926a79 | 1234 | sp = rxrpc_skb(skb); |
17926a79 | 1235 | |
89b475ab DH |
1236 | /* dig out the RxRPC connection details */ |
1237 | if (rxrpc_extract_header(sp, skb) < 0) | |
1238 | goto bad_message; | |
1239 | ||
8a681c36 DH |
1240 | if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) { |
1241 | static int lose; | |
1242 | if ((lose++ & 7) == 7) { | |
89b475ab | 1243 | trace_rxrpc_rx_lose(sp); |
987db9f7 | 1244 | rxrpc_free_skb(skb, rxrpc_skb_lost); |
5271953c | 1245 | return 0; |
8a681c36 DH |
1246 | } |
1247 | } | |
1248 | ||
2cfa2271 DH |
1249 | if (skb->tstamp == 0) |
1250 | skb->tstamp = ktime_get_real(); | |
49e19ec7 | 1251 | trace_rxrpc_rx_packet(sp); |
17926a79 | 1252 | |
248f219c DH |
1253 | switch (sp->hdr.type) { |
1254 | case RXRPC_PACKET_TYPE_VERSION: | |
dc71db34 | 1255 | if (rxrpc_to_client(sp)) |
ace45bec | 1256 | goto discard; |
44ba0698 DH |
1257 | rxrpc_post_packet_to_local(local, skb); |
1258 | goto out; | |
bc6e1ea3 | 1259 | |
248f219c | 1260 | case RXRPC_PACKET_TYPE_BUSY: |
dc71db34 | 1261 | if (rxrpc_to_server(sp)) |
248f219c | 1262 | goto discard; |
df561f66 | 1263 | fallthrough; |
403fc2a1 DH |
1264 | case RXRPC_PACKET_TYPE_ACK: |
1265 | case RXRPC_PACKET_TYPE_ACKALL: | |
1266 | if (sp->hdr.callNumber == 0) | |
1267 | goto bad_message; | |
df561f66 | 1268 | fallthrough; |
403fc2a1 DH |
1269 | case RXRPC_PACKET_TYPE_ABORT: |
1270 | break; | |
248f219c DH |
1271 | |
1272 | case RXRPC_PACKET_TYPE_DATA: | |
403fc2a1 DH |
1273 | if (sp->hdr.callNumber == 0 || |
1274 | sp->hdr.seq == 0) | |
248f219c | 1275 | goto bad_message; |
c3c9e3df | 1276 | if (!rxrpc_validate_data(skb)) |
248f219c | 1277 | goto bad_message; |
d0d5c0cd DH |
1278 | |
1279 | /* Unshare the packet so that it can be modified for in-place | |
1280 | * decryption. | |
1281 | */ | |
1282 | if (sp->hdr.securityIndex != 0) { | |
1283 | struct sk_buff *nskb = skb_unshare(skb, GFP_ATOMIC); | |
1284 | if (!nskb) { | |
1285 | rxrpc_eaten_skb(skb, rxrpc_skb_unshared_nomem); | |
1286 | goto out; | |
1287 | } | |
1288 | ||
1289 | if (nskb != skb) { | |
1290 | rxrpc_eaten_skb(skb, rxrpc_skb_received); | |
d0d5c0cd | 1291 | skb = nskb; |
59132894 | 1292 | rxrpc_new_skb(skb, rxrpc_skb_unshared); |
d0d5c0cd DH |
1293 | sp = rxrpc_skb(skb); |
1294 | } | |
1295 | } | |
248f219c | 1296 | break; |
b41d7cfe | 1297 | |
403fc2a1 DH |
1298 | case RXRPC_PACKET_TYPE_CHALLENGE: |
1299 | if (rxrpc_to_server(sp)) | |
1300 | goto discard; | |
1301 | break; | |
1302 | case RXRPC_PACKET_TYPE_RESPONSE: | |
1303 | if (rxrpc_to_client(sp)) | |
1304 | goto discard; | |
1305 | break; | |
1306 | ||
b41d7cfe DH |
1307 | /* Packet types 9-11 should just be ignored. */ |
1308 | case RXRPC_PACKET_TYPE_PARAMS: | |
1309 | case RXRPC_PACKET_TYPE_10: | |
1310 | case RXRPC_PACKET_TYPE_11: | |
1311 | goto discard; | |
403fc2a1 DH |
1312 | |
1313 | default: | |
1314 | _proto("Rx Bad Packet Type %u", sp->hdr.type); | |
1315 | goto bad_message; | |
248f219c | 1316 | } |
17926a79 | 1317 | |
403fc2a1 DH |
1318 | if (sp->hdr.serviceId == 0) |
1319 | goto bad_message; | |
1320 | ||
403fc2a1 DH |
1321 | if (rxrpc_to_server(sp)) { |
1322 | /* Weed out packets to services we're not offering. Packets | |
1323 | * that would begin a call are explicitly rejected and the rest | |
1324 | * are just discarded. | |
1325 | */ | |
1326 | rx = rcu_dereference(local->service); | |
1327 | if (!rx || (sp->hdr.serviceId != rx->srx.srx_service && | |
1328 | sp->hdr.serviceId != rx->second_service)) { | |
1329 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && | |
1330 | sp->hdr.seq == 1) | |
1331 | goto unsupported_service; | |
bfd28211 | 1332 | goto discard; |
403fc2a1 DH |
1333 | } |
1334 | } | |
1335 | ||
0099dc58 | 1336 | conn = rxrpc_find_connection_rcu(local, skb, &peer); |
248f219c DH |
1337 | if (conn) { |
1338 | if (sp->hdr.securityIndex != conn->security_ix) | |
1339 | goto wrong_security; | |
563ea7d5 | 1340 | |
4e255721 | 1341 | if (sp->hdr.serviceId != conn->service_id) { |
c1e15b49 DH |
1342 | int old_id; |
1343 | ||
1344 | if (!test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags)) | |
1345 | goto reupgrade; | |
1346 | old_id = cmpxchg(&conn->service_id, conn->params.service_id, | |
1347 | sp->hdr.serviceId); | |
1348 | ||
1349 | if (old_id != conn->params.service_id && | |
1350 | old_id != sp->hdr.serviceId) | |
4e255721 | 1351 | goto reupgrade; |
4e255721 | 1352 | } |
3d7682af | 1353 | |
248f219c DH |
1354 | if (sp->hdr.callNumber == 0) { |
1355 | /* Connection-level packet */ | |
1356 | _debug("CONN %p {%d}", conn, conn->debug_id); | |
1357 | rxrpc_post_packet_to_conn(conn, skb); | |
bfd28211 | 1358 | goto out; |
248f219c DH |
1359 | } |
1360 | ||
e8c3af6b DH |
1361 | if ((int)sp->hdr.serial - (int)conn->hi_serial > 0) |
1362 | conn->hi_serial = sp->hdr.serial; | |
17926a79 | 1363 | |
8496af50 | 1364 | /* Call-bound packets are routed by connection channel. */ |
248f219c DH |
1365 | channel = sp->hdr.cid & RXRPC_CHANNELMASK; |
1366 | chan = &conn->channels[channel]; | |
18bfeba5 DH |
1367 | |
1368 | /* Ignore really old calls */ | |
1369 | if (sp->hdr.callNumber < chan->last_call) | |
bfd28211 | 1370 | goto discard; |
18bfeba5 DH |
1371 | |
1372 | if (sp->hdr.callNumber == chan->last_call) { | |
57b0c9d4 DH |
1373 | if (chan->call || |
1374 | sp->hdr.type == RXRPC_PACKET_TYPE_ABORT) | |
bfd28211 | 1375 | goto discard; |
57b0c9d4 DH |
1376 | |
1377 | /* For the previous service call, if completed | |
1378 | * successfully, we discard all further packets. | |
18bfeba5 | 1379 | */ |
2266ffde | 1380 | if (rxrpc_conn_is_service(conn) && |
57b0c9d4 | 1381 | chan->last_type == RXRPC_PACKET_TYPE_ACK) |
bfd28211 | 1382 | goto discard; |
18bfeba5 | 1383 | |
57b0c9d4 DH |
1384 | /* But otherwise we need to retransmit the final packet |
1385 | * from data cached in the connection record. | |
18bfeba5 | 1386 | */ |
4764c0da DH |
1387 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) |
1388 | trace_rxrpc_rx_data(chan->call_debug_id, | |
1389 | sp->hdr.seq, | |
1390 | sp->hdr.serial, | |
1391 | sp->hdr.flags, 0); | |
18bfeba5 | 1392 | rxrpc_post_packet_to_conn(conn, skb); |
bfd28211 | 1393 | goto out; |
18bfeba5 | 1394 | } |
0d12f8a4 | 1395 | |
18bfeba5 | 1396 | call = rcu_dereference(chan->call); |
b3156274 DH |
1397 | |
1398 | if (sp->hdr.callNumber > chan->call_id) { | |
bfd28211 | 1399 | if (rxrpc_to_client(sp)) |
b3156274 | 1400 | goto reject_packet; |
b3156274 | 1401 | if (call) |
c1e15b49 | 1402 | rxrpc_input_implicit_end_call(rx, conn, call); |
b3156274 DH |
1403 | call = NULL; |
1404 | } | |
4e255721 | 1405 | |
1a025028 DH |
1406 | if (call) { |
1407 | if (sp->hdr.serviceId != call->service_id) | |
1408 | call->service_id = sp->hdr.serviceId; | |
1409 | if ((int)sp->hdr.serial - (int)call->rx_serial > 0) | |
1410 | call->rx_serial = sp->hdr.serial; | |
1411 | if (!test_bit(RXRPC_CALL_RX_HEARD, &call->flags)) | |
1412 | set_bit(RXRPC_CALL_RX_HEARD, &call->flags); | |
1413 | } | |
248f219c | 1414 | } |
8496af50 | 1415 | |
248f219c | 1416 | if (!call || atomic_read(&call->usage) == 0) { |
dc71db34 | 1417 | if (rxrpc_to_client(sp) || |
248f219c | 1418 | sp->hdr.type != RXRPC_PACKET_TYPE_DATA) |
bfd28211 | 1419 | goto bad_message; |
248f219c | 1420 | if (sp->hdr.seq != 1) |
bfd28211 | 1421 | goto discard; |
c1e15b49 | 1422 | call = rxrpc_new_incoming_call(local, rx, skb); |
bfd28211 | 1423 | if (!call) |
248f219c | 1424 | goto reject_packet; |
7727640c | 1425 | } |
44ba0698 | 1426 | |
4858e403 DH |
1427 | /* Process a call packet; this either discards or passes on the ref |
1428 | * elsewhere. | |
1429 | */ | |
e8c3af6b | 1430 | rxrpc_input_call_packet(call, skb); |
4858e403 | 1431 | goto out; |
248f219c | 1432 | |
248f219c | 1433 | discard: |
987db9f7 | 1434 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
44ba0698 | 1435 | out: |
49e19ec7 | 1436 | trace_rxrpc_rx_done(0, 0); |
5271953c | 1437 | return 0; |
8496af50 | 1438 | |
248f219c | 1439 | wrong_security: |
a25e21f0 | 1440 | trace_rxrpc_abort(0, "SEC", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, |
248f219c DH |
1441 | RXKADINCONSISTENCY, EBADMSG); |
1442 | skb->priority = RXKADINCONSISTENCY; | |
1443 | goto post_abort; | |
17926a79 | 1444 | |
403fc2a1 | 1445 | unsupported_service: |
403fc2a1 DH |
1446 | trace_rxrpc_abort(0, "INV", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, |
1447 | RX_INVALID_OPERATION, EOPNOTSUPP); | |
1448 | skb->priority = RX_INVALID_OPERATION; | |
1449 | goto post_abort; | |
1450 | ||
4e255721 | 1451 | reupgrade: |
a25e21f0 | 1452 | trace_rxrpc_abort(0, "UPG", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, |
4e255721 DH |
1453 | RX_PROTOCOL_ERROR, EBADMSG); |
1454 | goto protocol_error; | |
1455 | ||
17926a79 | 1456 | bad_message: |
a25e21f0 | 1457 | trace_rxrpc_abort(0, "BAD", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, |
248f219c | 1458 | RX_PROTOCOL_ERROR, EBADMSG); |
4e255721 | 1459 | protocol_error: |
17926a79 | 1460 | skb->priority = RX_PROTOCOL_ERROR; |
248f219c | 1461 | post_abort: |
ece64fec | 1462 | skb->mark = RXRPC_SKB_MARK_REJECT_ABORT; |
49e19ec7 DH |
1463 | reject_packet: |
1464 | trace_rxrpc_rx_done(skb->mark, skb->priority); | |
17926a79 | 1465 | rxrpc_reject_packet(local, skb); |
17926a79 | 1466 | _leave(" [badmsg]"); |
5271953c | 1467 | return 0; |
17926a79 | 1468 | } |