Commit | Line | Data |
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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 "ar-internal.h" |
11 | ||
248f219c DH |
12 | static void rxrpc_proto_abort(const char *why, |
13 | struct rxrpc_call *call, rxrpc_seq_t seq) | |
14 | { | |
3a92789a | 15 | if (rxrpc_abort_call(why, call, seq, RX_PROTOCOL_ERROR, -EBADMSG)) { |
248f219c DH |
16 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
17 | rxrpc_queue_call(call); | |
18 | } | |
19 | } | |
20 | ||
57494343 DH |
21 | /* |
22 | * Do TCP-style congestion management [RFC 5681]. | |
23 | */ | |
24 | static void rxrpc_congestion_management(struct rxrpc_call *call, | |
25 | struct sk_buff *skb, | |
ed1e8679 DH |
26 | struct rxrpc_ack_summary *summary, |
27 | rxrpc_serial_t acked_serial) | |
57494343 DH |
28 | { |
29 | enum rxrpc_congest_change change = rxrpc_cong_no_change; | |
57494343 DH |
30 | unsigned int cumulative_acks = call->cong_cumul_acks; |
31 | unsigned int cwnd = call->cong_cwnd; | |
32 | bool resend = false; | |
33 | ||
34 | summary->flight_size = | |
a4ea4c47 | 35 | (call->tx_top - call->acks_hard_ack) - summary->nr_acks; |
57494343 DH |
36 | |
37 | if (test_and_clear_bit(RXRPC_CALL_RETRANS_TIMEOUT, &call->flags)) { | |
38 | summary->retrans_timeo = true; | |
39 | call->cong_ssthresh = max_t(unsigned int, | |
40 | summary->flight_size / 2, 2); | |
41 | cwnd = 1; | |
8782def2 | 42 | if (cwnd >= call->cong_ssthresh && |
57494343 DH |
43 | call->cong_mode == RXRPC_CALL_SLOW_START) { |
44 | call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE; | |
45 | call->cong_tstamp = skb->tstamp; | |
46 | cumulative_acks = 0; | |
47 | } | |
48 | } | |
49 | ||
50 | cumulative_acks += summary->nr_new_acks; | |
51 | cumulative_acks += summary->nr_rot_new_acks; | |
52 | if (cumulative_acks > 255) | |
53 | cumulative_acks = 255; | |
54 | ||
55 | summary->mode = call->cong_mode; | |
56 | summary->cwnd = call->cong_cwnd; | |
57 | summary->ssthresh = call->cong_ssthresh; | |
58 | summary->cumulative_acks = cumulative_acks; | |
59 | summary->dup_acks = call->cong_dup_acks; | |
60 | ||
61 | switch (call->cong_mode) { | |
62 | case RXRPC_CALL_SLOW_START: | |
d57a3a15 | 63 | if (summary->saw_nacks) |
57494343 DH |
64 | goto packet_loss_detected; |
65 | if (summary->cumulative_acks > 0) | |
66 | cwnd += 1; | |
8782def2 | 67 | if (cwnd >= call->cong_ssthresh) { |
57494343 DH |
68 | call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE; |
69 | call->cong_tstamp = skb->tstamp; | |
70 | } | |
71 | goto out; | |
72 | ||
73 | case RXRPC_CALL_CONGEST_AVOIDANCE: | |
d57a3a15 | 74 | if (summary->saw_nacks) |
57494343 DH |
75 | goto packet_loss_detected; |
76 | ||
77 | /* We analyse the number of packets that get ACK'd per RTT | |
78 | * period and increase the window if we managed to fill it. | |
79 | */ | |
c410bf01 | 80 | if (call->peer->rtt_count == 0) |
57494343 DH |
81 | goto out; |
82 | if (ktime_before(skb->tstamp, | |
c410bf01 DH |
83 | ktime_add_us(call->cong_tstamp, |
84 | call->peer->srtt_us >> 3))) | |
57494343 DH |
85 | goto out_no_clear_ca; |
86 | change = rxrpc_cong_rtt_window_end; | |
87 | call->cong_tstamp = skb->tstamp; | |
88 | if (cumulative_acks >= cwnd) | |
89 | cwnd++; | |
90 | goto out; | |
91 | ||
92 | case RXRPC_CALL_PACKET_LOSS: | |
d57a3a15 | 93 | if (!summary->saw_nacks) |
57494343 DH |
94 | goto resume_normality; |
95 | ||
96 | if (summary->new_low_nack) { | |
97 | change = rxrpc_cong_new_low_nack; | |
98 | call->cong_dup_acks = 1; | |
99 | if (call->cong_extra > 1) | |
100 | call->cong_extra = 1; | |
101 | goto send_extra_data; | |
102 | } | |
103 | ||
104 | call->cong_dup_acks++; | |
105 | if (call->cong_dup_acks < 3) | |
106 | goto send_extra_data; | |
107 | ||
108 | change = rxrpc_cong_begin_retransmission; | |
109 | call->cong_mode = RXRPC_CALL_FAST_RETRANSMIT; | |
110 | call->cong_ssthresh = max_t(unsigned int, | |
111 | summary->flight_size / 2, 2); | |
112 | cwnd = call->cong_ssthresh + 3; | |
113 | call->cong_extra = 0; | |
114 | call->cong_dup_acks = 0; | |
115 | resend = true; | |
116 | goto out; | |
117 | ||
118 | case RXRPC_CALL_FAST_RETRANSMIT: | |
119 | if (!summary->new_low_nack) { | |
120 | if (summary->nr_new_acks == 0) | |
121 | cwnd += 1; | |
122 | call->cong_dup_acks++; | |
123 | if (call->cong_dup_acks == 2) { | |
124 | change = rxrpc_cong_retransmit_again; | |
125 | call->cong_dup_acks = 0; | |
126 | resend = true; | |
127 | } | |
128 | } else { | |
129 | change = rxrpc_cong_progress; | |
130 | cwnd = call->cong_ssthresh; | |
d57a3a15 | 131 | if (!summary->saw_nacks) |
57494343 DH |
132 | goto resume_normality; |
133 | } | |
134 | goto out; | |
135 | ||
136 | default: | |
137 | BUG(); | |
138 | goto out; | |
139 | } | |
140 | ||
141 | resume_normality: | |
142 | change = rxrpc_cong_cleared_nacks; | |
143 | call->cong_dup_acks = 0; | |
144 | call->cong_extra = 0; | |
145 | call->cong_tstamp = skb->tstamp; | |
8782def2 | 146 | if (cwnd < call->cong_ssthresh) |
57494343 DH |
147 | call->cong_mode = RXRPC_CALL_SLOW_START; |
148 | else | |
149 | call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE; | |
150 | out: | |
151 | cumulative_acks = 0; | |
152 | out_no_clear_ca: | |
a4ea4c47 DH |
153 | if (cwnd >= RXRPC_TX_MAX_WINDOW) |
154 | cwnd = RXRPC_TX_MAX_WINDOW; | |
57494343 DH |
155 | call->cong_cwnd = cwnd; |
156 | call->cong_cumul_acks = cumulative_acks; | |
ed1e8679 | 157 | trace_rxrpc_congest(call, summary, acked_serial, change); |
57494343 DH |
158 | if (resend && !test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) |
159 | rxrpc_queue_call(call); | |
160 | return; | |
161 | ||
162 | packet_loss_detected: | |
163 | change = rxrpc_cong_saw_nack; | |
164 | call->cong_mode = RXRPC_CALL_PACKET_LOSS; | |
165 | call->cong_dup_acks = 0; | |
166 | goto send_extra_data; | |
167 | ||
168 | send_extra_data: | |
169 | /* Send some previously unsent DATA if we have some to advance the ACK | |
170 | * state. | |
171 | */ | |
a4ea4c47 DH |
172 | if (test_bit(RXRPC_CALL_TX_LAST, &call->flags) || |
173 | summary->nr_acks != call->tx_top - call->acks_hard_ack) { | |
57494343 DH |
174 | call->cong_extra++; |
175 | wake_up(&call->waitq); | |
176 | } | |
177 | goto out_no_clear_ca; | |
178 | } | |
179 | ||
17926a79 | 180 | /* |
248f219c | 181 | * Apply a hard ACK by advancing the Tx window. |
17926a79 | 182 | */ |
c479d5f2 | 183 | static bool rxrpc_rotate_tx_window(struct rxrpc_call *call, rxrpc_seq_t to, |
31a1b989 | 184 | struct rxrpc_ack_summary *summary) |
17926a79 | 185 | { |
a4ea4c47 | 186 | struct rxrpc_txbuf *txb; |
c479d5f2 | 187 | bool rot_last = false; |
17926a79 | 188 | |
a4ea4c47 DH |
189 | list_for_each_entry_rcu(txb, &call->tx_buffer, call_link, false) { |
190 | if (before_eq(txb->seq, call->acks_hard_ack)) | |
191 | continue; | |
d57a3a15 | 192 | summary->nr_rot_new_acks++; |
a4ea4c47 | 193 | if (test_bit(RXRPC_TXBUF_LAST, &txb->flags)) { |
70790dbe | 194 | set_bit(RXRPC_CALL_TX_LAST, &call->flags); |
c479d5f2 DH |
195 | rot_last = true; |
196 | } | |
a4ea4c47 DH |
197 | if (txb->seq == to) |
198 | break; | |
248f219c | 199 | } |
17926a79 | 200 | |
a4ea4c47 DH |
201 | if (rot_last) |
202 | set_bit(RXRPC_CALL_TX_ALL_ACKED, &call->flags); | |
17926a79 | 203 | |
a4ea4c47 | 204 | _enter("%x,%x,%x,%d", to, call->acks_hard_ack, call->tx_top, rot_last); |
bc4abfcf | 205 | |
a4ea4c47 DH |
206 | if (call->acks_lowest_nak == call->acks_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; | |
17926a79 | 211 | } |
c479d5f2 | 212 | |
a4ea4c47 DH |
213 | smp_store_release(&call->acks_hard_ack, to); |
214 | ||
215 | trace_rxrpc_txqueue(call, (rot_last ? | |
216 | rxrpc_txqueue_rotate_last : | |
217 | rxrpc_txqueue_rotate)); | |
218 | wake_up(&call->waitq); | |
c479d5f2 | 219 | return rot_last; |
248f219c | 220 | } |
17926a79 | 221 | |
248f219c DH |
222 | /* |
223 | * End the transmission phase of a call. | |
224 | * | |
225 | * This occurs when we get an ACKALL packet, the first DATA packet of a reply, | |
226 | * or a final ACK packet. | |
227 | */ | |
70790dbe DH |
228 | static bool rxrpc_end_tx_phase(struct rxrpc_call *call, bool reply_begun, |
229 | const char *abort_why) | |
248f219c | 230 | { |
dfe99522 | 231 | unsigned int state; |
17926a79 | 232 | |
70790dbe | 233 | ASSERT(test_bit(RXRPC_CALL_TX_LAST, &call->flags)); |
17926a79 | 234 | |
248f219c | 235 | write_lock(&call->state_lock); |
651350d1 | 236 | |
dfe99522 DH |
237 | state = call->state; |
238 | switch (state) { | |
70790dbe | 239 | case RXRPC_CALL_CLIENT_SEND_REQUEST: |
248f219c | 240 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: |
70790dbe | 241 | if (reply_begun) |
dfe99522 | 242 | call->state = state = RXRPC_CALL_CLIENT_RECV_REPLY; |
70790dbe | 243 | else |
dfe99522 | 244 | call->state = state = RXRPC_CALL_CLIENT_AWAIT_REPLY; |
248f219c | 245 | break; |
70790dbe | 246 | |
248f219c DH |
247 | case RXRPC_CALL_SERVER_AWAIT_ACK: |
248 | __rxrpc_call_completed(call); | |
dfe99522 | 249 | state = call->state; |
248f219c | 250 | break; |
70790dbe DH |
251 | |
252 | default: | |
253 | goto bad_state; | |
17926a79 | 254 | } |
17926a79 | 255 | |
248f219c | 256 | write_unlock(&call->state_lock); |
dfe99522 | 257 | if (state == RXRPC_CALL_CLIENT_AWAIT_REPLY) |
a4ea4c47 | 258 | trace_rxrpc_txqueue(call, rxrpc_txqueue_await_reply); |
dfe99522 | 259 | else |
a4ea4c47 | 260 | trace_rxrpc_txqueue(call, rxrpc_txqueue_end); |
248f219c DH |
261 | _leave(" = ok"); |
262 | return true; | |
70790dbe DH |
263 | |
264 | bad_state: | |
265 | write_unlock(&call->state_lock); | |
266 | kdebug("end_tx %s", rxrpc_call_states[call->state]); | |
267 | rxrpc_proto_abort(abort_why, call, call->tx_top); | |
268 | return false; | |
269 | } | |
270 | ||
271 | /* | |
272 | * Begin the reply reception phase of a call. | |
273 | */ | |
274 | static bool rxrpc_receiving_reply(struct rxrpc_call *call) | |
275 | { | |
31a1b989 | 276 | struct rxrpc_ack_summary summary = { 0 }; |
a158bdd3 | 277 | unsigned long now, timo; |
70790dbe DH |
278 | rxrpc_seq_t top = READ_ONCE(call->tx_top); |
279 | ||
dd7c1ee5 | 280 | if (call->ackr_reason) { |
a158bdd3 DH |
281 | now = jiffies; |
282 | timo = now + MAX_JIFFY_OFFSET; | |
283 | WRITE_ONCE(call->resend_at, timo); | |
530403d9 | 284 | WRITE_ONCE(call->delay_ack_at, timo); |
a158bdd3 | 285 | trace_rxrpc_timer(call, rxrpc_timer_init_for_reply, now); |
dd7c1ee5 DH |
286 | } |
287 | ||
70790dbe | 288 | if (!test_bit(RXRPC_CALL_TX_LAST, &call->flags)) { |
c479d5f2 DH |
289 | if (!rxrpc_rotate_tx_window(call, top, &summary)) { |
290 | rxrpc_proto_abort("TXL", call, top); | |
291 | return false; | |
292 | } | |
70790dbe | 293 | } |
a11e6ff9 | 294 | return rxrpc_end_tx_phase(call, true, "ETD"); |
248f219c DH |
295 | } |
296 | ||
5d7edbc9 DH |
297 | static void rxrpc_input_update_ack_window(struct rxrpc_call *call, |
298 | rxrpc_seq_t window, rxrpc_seq_t wtop) | |
299 | { | |
300 | atomic64_set_release(&call->ackr_window, ((u64)wtop) << 32 | window); | |
301 | } | |
302 | ||
248f219c | 303 | /* |
5d7edbc9 DH |
304 | * Push a DATA packet onto the Rx queue. |
305 | */ | |
306 | static void rxrpc_input_queue_data(struct rxrpc_call *call, struct sk_buff *skb, | |
307 | rxrpc_seq_t window, rxrpc_seq_t wtop, | |
308 | enum rxrpc_receive_trace why) | |
309 | { | |
310 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
311 | bool last = sp->hdr.flags & RXRPC_LAST_PACKET; | |
312 | ||
313 | __skb_queue_tail(&call->recvmsg_queue, skb); | |
314 | rxrpc_input_update_ack_window(call, window, wtop); | |
315 | ||
316 | trace_rxrpc_receive(call, last ? why + 1 : why, sp->hdr.serial, sp->hdr.seq); | |
317 | } | |
318 | ||
319 | /* | |
320 | * Process a DATA packet. | |
248f219c | 321 | */ |
d4d02d8b | 322 | static void rxrpc_input_data_one(struct rxrpc_call *call, struct sk_buff *skb) |
248f219c DH |
323 | { |
324 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
5d7edbc9 | 325 | struct sk_buff *oos; |
d4d02d8b | 326 | rxrpc_serial_t serial = sp->hdr.serial; |
5d7edbc9 DH |
327 | u64 win = atomic64_read(&call->ackr_window); |
328 | rxrpc_seq_t window = lower_32_bits(win); | |
329 | rxrpc_seq_t wtop = upper_32_bits(win); | |
330 | rxrpc_seq_t wlimit = window + call->rx_winsize - 1; | |
331 | rxrpc_seq_t seq = sp->hdr.seq; | |
d4d02d8b | 332 | bool last = sp->hdr.flags & RXRPC_LAST_PACKET; |
5d7edbc9 | 333 | int ack_reason = -1; |
248f219c | 334 | |
d4d02d8b DH |
335 | rxrpc_inc_stat(call->rxnet, stat_rx_data); |
336 | if (sp->hdr.flags & RXRPC_REQUEST_ACK) | |
337 | rxrpc_inc_stat(call->rxnet, stat_rx_data_reqack); | |
338 | if (sp->hdr.flags & RXRPC_JUMBO_PACKET) | |
339 | rxrpc_inc_stat(call->rxnet, stat_rx_data_jumbo); | |
c3c9e3df | 340 | |
d4d02d8b | 341 | if (last) { |
5d7edbc9 DH |
342 | if (test_and_set_bit(RXRPC_CALL_RX_LAST, &call->flags) && |
343 | seq + 1 != wtop) { | |
d4d02d8b | 344 | rxrpc_proto_abort("LSN", call, seq); |
5d7edbc9 | 345 | goto err_free; |
d4d02d8b DH |
346 | } |
347 | } else { | |
348 | if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) && | |
5d7edbc9 DH |
349 | after_eq(seq, wtop)) { |
350 | pr_warn("Packet beyond last: c=%x q=%x window=%x-%x wlimit=%x\n", | |
351 | call->debug_id, seq, window, wtop, wlimit); | |
d4d02d8b | 352 | rxrpc_proto_abort("LSA", call, seq); |
5d7edbc9 | 353 | goto err_free; |
d4d02d8b | 354 | } |
c3c9e3df | 355 | } |
248f219c | 356 | |
5d7edbc9 DH |
357 | if (after(seq, call->rx_highest_seq)) |
358 | call->rx_highest_seq = seq; | |
359 | ||
d4d02d8b | 360 | trace_rxrpc_rx_data(call->debug_id, seq, serial, sp->hdr.flags); |
17926a79 | 361 | |
5d7edbc9 DH |
362 | if (before(seq, window)) { |
363 | ack_reason = RXRPC_ACK_DUPLICATE; | |
364 | goto send_ack; | |
d4d02d8b | 365 | } |
5d7edbc9 DH |
366 | if (after(seq, wlimit)) { |
367 | ack_reason = RXRPC_ACK_EXCEEDS_WINDOW; | |
368 | goto send_ack; | |
d4d02d8b DH |
369 | } |
370 | ||
5d7edbc9 DH |
371 | /* Queue the packet. */ |
372 | if (seq == window) { | |
373 | rxrpc_seq_t reset_from; | |
374 | bool reset_sack = false; | |
d4d02d8b | 375 | |
5d7edbc9 DH |
376 | if (sp->hdr.flags & RXRPC_REQUEST_ACK) |
377 | ack_reason = RXRPC_ACK_REQUESTED; | |
378 | /* Send an immediate ACK if we fill in a hole */ | |
379 | else if (!skb_queue_empty(&call->rx_oos_queue)) | |
380 | ack_reason = RXRPC_ACK_DELAY; | |
d4d02d8b | 381 | |
5d7edbc9 DH |
382 | window++; |
383 | if (after(window, wtop)) | |
384 | wtop = window; | |
d4d02d8b | 385 | |
5d7edbc9 DH |
386 | spin_lock(&call->recvmsg_queue.lock); |
387 | rxrpc_input_queue_data(call, skb, window, wtop, rxrpc_receive_queue); | |
388 | skb = NULL; | |
389 | ||
390 | while ((oos = skb_peek(&call->rx_oos_queue))) { | |
391 | struct rxrpc_skb_priv *osp = rxrpc_skb(oos); | |
392 | ||
393 | if (after(osp->hdr.seq, window)) | |
394 | break; | |
395 | ||
396 | __skb_unlink(oos, &call->rx_oos_queue); | |
397 | last = osp->hdr.flags & RXRPC_LAST_PACKET; | |
398 | seq = osp->hdr.seq; | |
399 | if (!reset_sack) { | |
400 | reset_from = seq; | |
401 | reset_sack = true; | |
402 | } | |
403 | ||
404 | window++; | |
405 | rxrpc_input_queue_data(call, oos, window, wtop, | |
406 | rxrpc_receive_queue_oos); | |
d4d02d8b | 407 | } |
d4d02d8b | 408 | |
5d7edbc9 | 409 | spin_unlock(&call->recvmsg_queue.lock); |
d4d02d8b | 410 | |
5d7edbc9 DH |
411 | if (reset_sack) { |
412 | do { | |
413 | call->ackr_sack_table[reset_from % RXRPC_SACK_SIZE] = 0; | |
414 | } while (reset_from++, before(reset_from, window)); | |
415 | } | |
d4d02d8b | 416 | } else { |
5d7edbc9 | 417 | bool keep = false; |
d4d02d8b | 418 | |
5d7edbc9 DH |
419 | ack_reason = RXRPC_ACK_OUT_OF_SEQUENCE; |
420 | ||
421 | if (!call->ackr_sack_table[seq % RXRPC_SACK_SIZE]) { | |
422 | call->ackr_sack_table[seq % RXRPC_SACK_SIZE] = 1; | |
423 | keep = 1; | |
424 | } | |
425 | ||
426 | if (after(seq + 1, wtop)) { | |
427 | wtop = seq + 1; | |
428 | rxrpc_input_update_ack_window(call, window, wtop); | |
429 | } | |
430 | ||
431 | if (!keep) { | |
432 | ack_reason = RXRPC_ACK_DUPLICATE; | |
433 | goto send_ack; | |
434 | } | |
435 | ||
436 | skb_queue_walk(&call->rx_oos_queue, oos) { | |
437 | struct rxrpc_skb_priv *osp = rxrpc_skb(oos); | |
438 | ||
439 | if (after(osp->hdr.seq, seq)) { | |
440 | __skb_queue_before(&call->rx_oos_queue, oos, skb); | |
441 | goto oos_queued; | |
442 | } | |
d4d02d8b | 443 | } |
5d7edbc9 DH |
444 | |
445 | __skb_queue_tail(&call->rx_oos_queue, skb); | |
446 | oos_queued: | |
447 | trace_rxrpc_receive(call, last ? rxrpc_receive_oos_last : rxrpc_receive_oos, | |
448 | sp->hdr.serial, sp->hdr.seq); | |
449 | skb = NULL; | |
d4d02d8b DH |
450 | } |
451 | ||
5d7edbc9 DH |
452 | send_ack: |
453 | if (ack_reason < 0 && | |
454 | atomic_inc_return(&call->ackr_nr_unacked) > 2 && | |
455 | test_and_set_bit(RXRPC_CALL_IDLE_ACK_PENDING, &call->flags)) { | |
456 | ack_reason = RXRPC_ACK_IDLE; | |
457 | } else if (ack_reason >= 0) { | |
458 | set_bit(RXRPC_CALL_IDLE_ACK_PENDING, &call->flags); | |
459 | } | |
460 | ||
461 | if (ack_reason >= 0) | |
462 | rxrpc_send_ACK(call, ack_reason, serial, | |
d4d02d8b DH |
463 | rxrpc_propose_ack_input_data); |
464 | else | |
465 | rxrpc_propose_delay_ACK(call, serial, | |
466 | rxrpc_propose_ack_input_data); | |
467 | ||
5d7edbc9 | 468 | err_free: |
d4d02d8b | 469 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
17926a79 DH |
470 | } |
471 | ||
472 | /* | |
d4d02d8b | 473 | * Split a jumbo packet and file the bits separately. |
17926a79 | 474 | */ |
d4d02d8b | 475 | static bool rxrpc_input_split_jumbo(struct rxrpc_call *call, struct sk_buff *skb) |
17926a79 | 476 | { |
d4d02d8b DH |
477 | struct rxrpc_jumbo_header jhdr; |
478 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb), *jsp; | |
479 | struct sk_buff *jskb; | |
480 | unsigned int offset = sizeof(struct rxrpc_wire_header); | |
481 | unsigned int len = skb->len - offset; | |
17926a79 | 482 | |
d4d02d8b DH |
483 | while (sp->hdr.flags & RXRPC_JUMBO_PACKET) { |
484 | if (len < RXRPC_JUMBO_SUBPKTLEN) | |
485 | goto protocol_error; | |
486 | if (sp->hdr.flags & RXRPC_LAST_PACKET) | |
487 | goto protocol_error; | |
488 | if (skb_copy_bits(skb, offset + RXRPC_JUMBO_DATALEN, | |
489 | &jhdr, sizeof(jhdr)) < 0) | |
490 | goto protocol_error; | |
491 | ||
492 | jskb = skb_clone(skb, GFP_ATOMIC); | |
493 | if (!jskb) { | |
494 | kdebug("couldn't clone"); | |
495 | return false; | |
496 | } | |
497 | rxrpc_new_skb(jskb, rxrpc_skb_cloned_jumbo); | |
498 | jsp = rxrpc_skb(jskb); | |
499 | jsp->offset = offset; | |
500 | jsp->len = RXRPC_JUMBO_DATALEN; | |
501 | rxrpc_input_data_one(call, jskb); | |
502 | ||
503 | sp->hdr.flags = jhdr.flags; | |
504 | sp->hdr._rsvd = ntohs(jhdr._rsvd); | |
505 | sp->hdr.seq++; | |
506 | sp->hdr.serial++; | |
507 | offset += RXRPC_JUMBO_SUBPKTLEN; | |
508 | len -= RXRPC_JUMBO_SUBPKTLEN; | |
248f219c | 509 | } |
d4d02d8b DH |
510 | |
511 | sp->offset = offset; | |
512 | sp->len = len; | |
513 | rxrpc_input_data_one(call, skb); | |
514 | return true; | |
515 | ||
516 | protocol_error: | |
517 | return false; | |
248f219c | 518 | } |
17926a79 | 519 | |
248f219c | 520 | /* |
4858e403 DH |
521 | * Process a DATA packet, adding the packet to the Rx ring. The caller's |
522 | * packet ref must be passed on or discarded. | |
248f219c | 523 | */ |
e8c3af6b | 524 | static void rxrpc_input_data(struct rxrpc_call *call, struct sk_buff *skb) |
248f219c DH |
525 | { |
526 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
146d8fef | 527 | enum rxrpc_call_state state; |
d4d02d8b DH |
528 | rxrpc_serial_t serial = sp->hdr.serial; |
529 | rxrpc_seq_t seq0 = sp->hdr.seq; | |
17926a79 | 530 | |
5d7edbc9 DH |
531 | _enter("{%llx,%x},{%u,%x}", |
532 | atomic64_read(&call->ackr_window), call->rx_highest_seq, | |
533 | skb->len, seq0); | |
17926a79 | 534 | |
d4d02d8b DH |
535 | _proto("Rx DATA %%%u { #%u f=%02x }", |
536 | sp->hdr.serial, seq0, sp->hdr.flags); | |
17926a79 | 537 | |
146d8fef | 538 | state = READ_ONCE(call->state); |
4858e403 | 539 | if (state >= RXRPC_CALL_COMPLETE) { |
987db9f7 | 540 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
248f219c | 541 | return; |
4858e403 | 542 | } |
17926a79 | 543 | |
d4d02d8b DH |
544 | /* Unshare the packet so that it can be modified for in-place |
545 | * decryption. | |
546 | */ | |
547 | if (sp->hdr.securityIndex != 0) { | |
548 | struct sk_buff *nskb = skb_unshare(skb, GFP_ATOMIC); | |
549 | if (!nskb) { | |
550 | rxrpc_eaten_skb(skb, rxrpc_skb_unshared_nomem); | |
551 | return; | |
552 | } | |
553 | ||
554 | if (nskb != skb) { | |
555 | rxrpc_eaten_skb(skb, rxrpc_skb_received); | |
556 | skb = nskb; | |
557 | rxrpc_new_skb(skb, rxrpc_skb_unshared); | |
558 | sp = rxrpc_skb(skb); | |
559 | } | |
560 | } | |
561 | ||
a95d25dd | 562 | if (state == RXRPC_CALL_SERVER_RECV_REQUEST) { |
a158bdd3 DH |
563 | unsigned long timo = READ_ONCE(call->next_req_timo); |
564 | unsigned long now, expect_req_by; | |
565 | ||
566 | if (timo) { | |
567 | now = jiffies; | |
568 | expect_req_by = now + timo; | |
569 | WRITE_ONCE(call->expect_req_by, expect_req_by); | |
570 | rxrpc_reduce_call_timer(call, expect_req_by, now, | |
571 | rxrpc_timer_set_for_idle); | |
572 | } | |
573 | } | |
574 | ||
c1e15b49 DH |
575 | spin_lock(&call->input_lock); |
576 | ||
248f219c DH |
577 | /* Received data implicitly ACKs all of the request packets we sent |
578 | * when we're acting as a client. | |
579 | */ | |
146d8fef DH |
580 | if ((state == RXRPC_CALL_CLIENT_SEND_REQUEST || |
581 | state == RXRPC_CALL_CLIENT_AWAIT_REPLY) && | |
70790dbe | 582 | !rxrpc_receiving_reply(call)) |
d4d02d8b | 583 | goto out; |
72f0c6fb | 584 | |
d4d02d8b DH |
585 | if (!rxrpc_input_split_jumbo(call, skb)) { |
586 | rxrpc_proto_abort("VLD", call, sp->hdr.seq); | |
587 | goto out; | |
248f219c | 588 | } |
d4d02d8b | 589 | skb = NULL; |
17926a79 | 590 | |
d4d02d8b | 591 | out: |
f71dbf2f DH |
592 | trace_rxrpc_notify_socket(call->debug_id, serial); |
593 | rxrpc_notify_socket(call); | |
c1e15b49 | 594 | |
c1e15b49 | 595 | spin_unlock(&call->input_lock); |
987db9f7 | 596 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
248f219c | 597 | _leave(" [queued]"); |
17926a79 DH |
598 | } |
599 | ||
50235c4b | 600 | /* |
4700c4d8 | 601 | * See if there's a cached RTT probe to complete. |
50235c4b | 602 | */ |
4700c4d8 DH |
603 | static void rxrpc_complete_rtt_probe(struct rxrpc_call *call, |
604 | ktime_t resp_time, | |
605 | rxrpc_serial_t acked_serial, | |
606 | rxrpc_serial_t ack_serial, | |
607 | enum rxrpc_rtt_rx_trace type) | |
50235c4b | 608 | { |
4700c4d8 DH |
609 | rxrpc_serial_t orig_serial; |
610 | unsigned long avail; | |
50235c4b | 611 | ktime_t sent_at; |
4700c4d8 DH |
612 | bool matched = false; |
613 | int i; | |
50235c4b | 614 | |
4700c4d8 DH |
615 | avail = READ_ONCE(call->rtt_avail); |
616 | smp_rmb(); /* Read avail bits before accessing data. */ | |
50235c4b | 617 | |
4700c4d8 DH |
618 | for (i = 0; i < ARRAY_SIZE(call->rtt_serial); i++) { |
619 | if (!test_bit(i + RXRPC_CALL_RTT_PEND_SHIFT, &avail)) | |
50235c4b | 620 | continue; |
b604dd98 | 621 | |
4700c4d8 DH |
622 | sent_at = call->rtt_sent_at[i]; |
623 | orig_serial = call->rtt_serial[i]; | |
624 | ||
625 | if (orig_serial == acked_serial) { | |
626 | clear_bit(i + RXRPC_CALL_RTT_PEND_SHIFT, &call->rtt_avail); | |
627 | smp_mb(); /* Read data before setting avail bit */ | |
628 | set_bit(i, &call->rtt_avail); | |
629 | if (type != rxrpc_rtt_rx_cancel) | |
630 | rxrpc_peer_add_rtt(call, type, i, acked_serial, ack_serial, | |
631 | sent_at, resp_time); | |
632 | else | |
633 | trace_rxrpc_rtt_rx(call, rxrpc_rtt_rx_cancel, i, | |
634 | orig_serial, acked_serial, 0, 0); | |
635 | matched = true; | |
636 | } | |
637 | ||
638 | /* If a later serial is being acked, then mark this slot as | |
639 | * being available. | |
640 | */ | |
641 | if (after(acked_serial, orig_serial)) { | |
642 | trace_rxrpc_rtt_rx(call, rxrpc_rtt_rx_obsolete, i, | |
643 | orig_serial, acked_serial, 0, 0); | |
644 | clear_bit(i + RXRPC_CALL_RTT_PEND_SHIFT, &call->rtt_avail); | |
645 | smp_wmb(); | |
646 | set_bit(i, &call->rtt_avail); | |
647 | } | |
648 | } | |
50235c4b | 649 | |
4700c4d8 DH |
650 | if (!matched) |
651 | trace_rxrpc_rtt_rx(call, rxrpc_rtt_rx_lost, 9, 0, acked_serial, 0, 0); | |
50235c4b DH |
652 | } |
653 | ||
bd1fdf8c DH |
654 | /* |
655 | * Process the response to a ping that we sent to find out if we lost an ACK. | |
656 | * | |
657 | * If we got back a ping response that indicates a lower tx_top than what we | |
658 | * had at the time of the ping transmission, we adjudge all the DATA packets | |
659 | * sent between the response tx_top and the ping-time tx_top to have been lost. | |
660 | */ | |
661 | static void rxrpc_input_check_for_lost_ack(struct rxrpc_call *call) | |
662 | { | |
d57a3a15 DH |
663 | if (after(call->acks_lost_top, call->acks_prev_seq) && |
664 | !test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) | |
bd1fdf8c DH |
665 | rxrpc_queue_call(call); |
666 | } | |
667 | ||
8e83134d DH |
668 | /* |
669 | * Process a ping response. | |
670 | */ | |
671 | static void rxrpc_input_ping_response(struct rxrpc_call *call, | |
672 | ktime_t resp_time, | |
4700c4d8 | 673 | rxrpc_serial_t acked_serial, |
8e83134d DH |
674 | rxrpc_serial_t ack_serial) |
675 | { | |
4700c4d8 | 676 | if (acked_serial == call->acks_lost_ping) |
bd1fdf8c | 677 | rxrpc_input_check_for_lost_ack(call); |
8e83134d DH |
678 | } |
679 | ||
17926a79 | 680 | /* |
248f219c | 681 | * Process the extra information that may be appended to an ACK packet |
17926a79 | 682 | */ |
248f219c DH |
683 | static void rxrpc_input_ackinfo(struct rxrpc_call *call, struct sk_buff *skb, |
684 | struct rxrpc_ackinfo *ackinfo) | |
17926a79 | 685 | { |
248f219c DH |
686 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
687 | struct rxrpc_peer *peer; | |
688 | unsigned int mtu; | |
702f2ac8 | 689 | bool wake = false; |
01fd0742 | 690 | u32 rwind = ntohl(ackinfo->rwind); |
248f219c DH |
691 | |
692 | _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }", | |
693 | sp->hdr.serial, | |
694 | ntohl(ackinfo->rxMTU), ntohl(ackinfo->maxMTU), | |
01fd0742 | 695 | rwind, ntohl(ackinfo->jumbo_max)); |
248f219c | 696 | |
a4ea4c47 DH |
697 | if (rwind > RXRPC_TX_MAX_WINDOW) |
698 | rwind = RXRPC_TX_MAX_WINDOW; | |
702f2ac8 | 699 | if (call->tx_winsize != rwind) { |
702f2ac8 DH |
700 | if (rwind > call->tx_winsize) |
701 | wake = true; | |
a2ad7c21 | 702 | trace_rxrpc_rx_rwind_change(call, sp->hdr.serial, rwind, wake); |
702f2ac8 DH |
703 | call->tx_winsize = rwind; |
704 | } | |
705 | ||
08511150 DH |
706 | if (call->cong_ssthresh > rwind) |
707 | call->cong_ssthresh = rwind; | |
248f219c DH |
708 | |
709 | mtu = min(ntohl(ackinfo->rxMTU), ntohl(ackinfo->maxMTU)); | |
710 | ||
711 | peer = call->peer; | |
712 | if (mtu < peer->maxdata) { | |
713 | spin_lock_bh(&peer->lock); | |
714 | peer->maxdata = mtu; | |
715 | peer->mtu = mtu + peer->hdrsize; | |
716 | spin_unlock_bh(&peer->lock); | |
717 | _net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata); | |
718 | } | |
702f2ac8 DH |
719 | |
720 | if (wake) | |
721 | wake_up(&call->waitq); | |
248f219c | 722 | } |
17926a79 | 723 | |
248f219c DH |
724 | /* |
725 | * Process individual soft ACKs. | |
726 | * | |
727 | * Each ACK in the array corresponds to one packet and can be either an ACK or | |
728 | * a NAK. If we get find an explicitly NAK'd packet we resend immediately; | |
729 | * packets that lie beyond the end of the ACK list are scheduled for resend by | |
730 | * the timer on the basis that the peer might just not have processed them at | |
731 | * the time the ACK was sent. | |
732 | */ | |
733 | static void rxrpc_input_soft_acks(struct rxrpc_call *call, u8 *acks, | |
31a1b989 DH |
734 | rxrpc_seq_t seq, int nr_acks, |
735 | struct rxrpc_ack_summary *summary) | |
248f219c | 736 | { |
d57a3a15 | 737 | unsigned int i; |
a4ea4c47 | 738 | |
d57a3a15 DH |
739 | for (i = 0; i < nr_acks; i++) { |
740 | if (acks[i] == RXRPC_ACK_TYPE_ACK) { | |
31a1b989 | 741 | summary->nr_acks++; |
31a1b989 | 742 | summary->nr_new_acks++; |
d57a3a15 DH |
743 | } else { |
744 | if (!summary->saw_nacks && | |
745 | call->acks_lowest_nak != seq + i) { | |
746 | call->acks_lowest_nak = seq + i; | |
31a1b989 DH |
747 | summary->new_low_nack = true; |
748 | } | |
d57a3a15 | 749 | summary->saw_nacks = true; |
17926a79 | 750 | } |
17926a79 DH |
751 | } |
752 | } | |
753 | ||
441fdee1 DH |
754 | /* |
755 | * Return true if the ACK is valid - ie. it doesn't appear to have regressed | |
756 | * with respect to the ack state conveyed by preceding ACKs. | |
757 | */ | |
758 | static bool rxrpc_is_ack_valid(struct rxrpc_call *call, | |
759 | rxrpc_seq_t first_pkt, rxrpc_seq_t prev_pkt) | |
760 | { | |
8940ba3c | 761 | rxrpc_seq_t base = READ_ONCE(call->acks_first_seq); |
441fdee1 DH |
762 | |
763 | if (after(first_pkt, base)) | |
764 | return true; /* The window advanced */ | |
765 | ||
766 | if (before(first_pkt, base)) | |
767 | return false; /* firstPacket regressed */ | |
768 | ||
8940ba3c | 769 | if (after_eq(prev_pkt, call->acks_prev_seq)) |
441fdee1 DH |
770 | return true; /* previousPacket hasn't regressed. */ |
771 | ||
772 | /* Some rx implementations put a serial number in previousPacket. */ | |
773 | if (after_eq(prev_pkt, base + call->tx_winsize)) | |
774 | return false; | |
775 | return true; | |
776 | } | |
777 | ||
17926a79 | 778 | /* |
248f219c DH |
779 | * Process an ACK packet. |
780 | * | |
781 | * ack.firstPacket is the sequence number of the first soft-ACK'd/NAK'd packet | |
782 | * in the ACK array. Anything before that is hard-ACK'd and may be discarded. | |
783 | * | |
784 | * A hard-ACK means that a packet has been processed and may be discarded; a | |
785 | * soft-ACK means that the packet may be discarded and retransmission | |
786 | * requested. A phase is complete when all packets are hard-ACK'd. | |
17926a79 | 787 | */ |
e8c3af6b | 788 | static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb) |
17926a79 | 789 | { |
31a1b989 | 790 | struct rxrpc_ack_summary summary = { 0 }; |
d57a3a15 | 791 | struct rxrpc_ackpacket ack; |
17926a79 | 792 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
d57a3a15 DH |
793 | struct rxrpc_ackinfo info; |
794 | struct sk_buff *skb_old = NULL, *skb_put = skb; | |
68528d93 | 795 | rxrpc_serial_t ack_serial, acked_serial; |
1a2391c3 | 796 | rxrpc_seq_t first_soft_ack, hard_ack, prev_pkt; |
775e5b71 | 797 | int nr_acks, offset, ioffset; |
248f219c DH |
798 | |
799 | _enter(""); | |
800 | ||
775e5b71 | 801 | offset = sizeof(struct rxrpc_wire_header); |
d57a3a15 DH |
802 | if (skb_copy_bits(skb, offset, &ack, sizeof(ack)) < 0) { |
803 | rxrpc_proto_abort("XAK", call, 0); | |
804 | goto out_not_locked; | |
17926a79 | 805 | } |
d57a3a15 | 806 | offset += sizeof(ack); |
248f219c | 807 | |
68528d93 | 808 | ack_serial = sp->hdr.serial; |
d57a3a15 DH |
809 | acked_serial = ntohl(ack.serial); |
810 | first_soft_ack = ntohl(ack.firstPacket); | |
811 | prev_pkt = ntohl(ack.previousPacket); | |
248f219c | 812 | hard_ack = first_soft_ack - 1; |
d57a3a15 DH |
813 | nr_acks = ack.nAcks; |
814 | summary.ack_reason = (ack.reason < RXRPC_ACK__INVALID ? | |
815 | ack.reason : RXRPC_ACK__INVALID); | |
248f219c | 816 | |
68528d93 | 817 | trace_rxrpc_rx_ack(call, ack_serial, acked_serial, |
1a2391c3 | 818 | first_soft_ack, prev_pkt, |
b1d9f7fd | 819 | summary.ack_reason, nr_acks); |
d57a3a15 | 820 | rxrpc_inc_stat(call->rxnet, stat_rx_acks[ack.reason]); |
ec71eb9a | 821 | |
d57a3a15 | 822 | switch (ack.reason) { |
4700c4d8 | 823 | case RXRPC_ACK_PING_RESPONSE: |
4700c4d8 DH |
824 | rxrpc_complete_rtt_probe(call, skb->tstamp, acked_serial, ack_serial, |
825 | rxrpc_rtt_rx_ping_response); | |
826 | break; | |
827 | case RXRPC_ACK_REQUESTED: | |
828 | rxrpc_complete_rtt_probe(call, skb->tstamp, acked_serial, ack_serial, | |
829 | rxrpc_rtt_rx_requested_ack); | |
830 | break; | |
831 | default: | |
832 | if (acked_serial != 0) | |
833 | rxrpc_complete_rtt_probe(call, skb->tstamp, acked_serial, ack_serial, | |
834 | rxrpc_rtt_rx_cancel); | |
835 | break; | |
836 | } | |
8e83134d | 837 | |
d57a3a15 | 838 | if (ack.reason == RXRPC_ACK_PING) { |
68528d93 | 839 | _proto("Rx ACK %%%u PING Request", ack_serial); |
72f0c6fb DH |
840 | rxrpc_send_ACK(call, RXRPC_ACK_PING_RESPONSE, ack_serial, |
841 | rxrpc_propose_ack_respond_to_ping); | |
248f219c | 842 | } else if (sp->hdr.flags & RXRPC_REQUEST_ACK) { |
72f0c6fb DH |
843 | rxrpc_send_ACK(call, RXRPC_ACK_REQUESTED, ack_serial, |
844 | rxrpc_propose_ack_respond_to_ack); | |
17926a79 DH |
845 | } |
846 | ||
adc9613f DH |
847 | /* If we get an EXCEEDS_WINDOW ACK from the server, it probably |
848 | * indicates that the client address changed due to NAT. The server | |
849 | * lost the call because it switched to a different peer. | |
850 | */ | |
d57a3a15 | 851 | if (unlikely(ack.reason == RXRPC_ACK_EXCEEDS_WINDOW) && |
adc9613f DH |
852 | first_soft_ack == 1 && |
853 | prev_pkt == 0 && | |
854 | rxrpc_is_client_call(call)) { | |
855 | rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED, | |
856 | 0, -ENETRESET); | |
857 | return; | |
858 | } | |
859 | ||
860 | /* If we get an OUT_OF_SEQUENCE ACK from the server, that can also | |
861 | * indicate a change of address. However, we can retransmit the call | |
862 | * if we still have it buffered to the beginning. | |
863 | */ | |
d57a3a15 | 864 | if (unlikely(ack.reason == RXRPC_ACK_OUT_OF_SEQUENCE) && |
adc9613f DH |
865 | first_soft_ack == 1 && |
866 | prev_pkt == 0 && | |
a4ea4c47 | 867 | call->acks_hard_ack == 0 && |
adc9613f DH |
868 | rxrpc_is_client_call(call)) { |
869 | rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED, | |
870 | 0, -ENETRESET); | |
871 | return; | |
872 | } | |
873 | ||
1a2391c3 | 874 | /* Discard any out-of-order or duplicate ACKs (outside lock). */ |
441fdee1 | 875 | if (!rxrpc_is_ack_valid(call, first_soft_ack, prev_pkt)) { |
68528d93 | 876 | trace_rxrpc_rx_discard_ack(call->debug_id, ack_serial, |
8940ba3c DH |
877 | first_soft_ack, call->acks_first_seq, |
878 | prev_pkt, call->acks_prev_seq); | |
d57a3a15 | 879 | goto out_not_locked; |
d1f12947 | 880 | } |
c1e15b49 | 881 | |
d57a3a15 | 882 | info.rxMTU = 0; |
775e5b71 | 883 | ioffset = offset + nr_acks + 3; |
d57a3a15 DH |
884 | if (skb->len >= ioffset + sizeof(info) && |
885 | skb_copy_bits(skb, ioffset, &info, sizeof(info)) < 0) { | |
886 | rxrpc_proto_abort("XAI", call, 0); | |
887 | goto out_not_locked; | |
888 | } | |
889 | ||
890 | if (nr_acks > 0) | |
891 | skb_condense(skb); | |
c1e15b49 DH |
892 | |
893 | spin_lock(&call->input_lock); | |
894 | ||
1a2391c3 | 895 | /* Discard any out-of-order or duplicate ACKs (inside lock). */ |
441fdee1 | 896 | if (!rxrpc_is_ack_valid(call, first_soft_ack, prev_pkt)) { |
68528d93 | 897 | trace_rxrpc_rx_discard_ack(call->debug_id, ack_serial, |
8940ba3c DH |
898 | first_soft_ack, call->acks_first_seq, |
899 | prev_pkt, call->acks_prev_seq); | |
c1e15b49 | 900 | goto out; |
d1f12947 | 901 | } |
298bc15b | 902 | call->acks_latest_ts = skb->tstamp; |
298bc15b | 903 | |
8940ba3c DH |
904 | call->acks_first_seq = first_soft_ack; |
905 | call->acks_prev_seq = prev_pkt; | |
1a2391c3 | 906 | |
d57a3a15 DH |
907 | switch (ack.reason) { |
908 | case RXRPC_ACK_PING: | |
909 | break; | |
910 | case RXRPC_ACK_PING_RESPONSE: | |
911 | rxrpc_input_ping_response(call, skb->tstamp, acked_serial, | |
912 | ack_serial); | |
913 | fallthrough; | |
914 | default: | |
915 | if (after(acked_serial, call->acks_highest_serial)) | |
916 | call->acks_highest_serial = acked_serial; | |
917 | break; | |
918 | } | |
589a0c1e | 919 | |
298bc15b | 920 | /* Parse rwind and mtu sizes if provided. */ |
d57a3a15 DH |
921 | if (info.rxMTU) |
922 | rxrpc_input_ackinfo(call, skb, &info); | |
17926a79 | 923 | |
c1e15b49 DH |
924 | if (first_soft_ack == 0) { |
925 | rxrpc_proto_abort("AK0", call, 0); | |
926 | goto out; | |
927 | } | |
17926a79 | 928 | |
248f219c | 929 | /* Ignore ACKs unless we are or have just been transmitting. */ |
146d8fef | 930 | switch (READ_ONCE(call->state)) { |
248f219c DH |
931 | case RXRPC_CALL_CLIENT_SEND_REQUEST: |
932 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
933 | case RXRPC_CALL_SERVER_SEND_REPLY: | |
934 | case RXRPC_CALL_SERVER_AWAIT_ACK: | |
935 | break; | |
17926a79 | 936 | default: |
c1e15b49 | 937 | goto out; |
248f219c | 938 | } |
17926a79 | 939 | |
a4ea4c47 | 940 | if (before(hard_ack, call->acks_hard_ack) || |
c1e15b49 DH |
941 | after(hard_ack, call->tx_top)) { |
942 | rxrpc_proto_abort("AKW", call, 0); | |
943 | goto out; | |
944 | } | |
945 | if (nr_acks > call->tx_top - hard_ack) { | |
946 | rxrpc_proto_abort("AKN", call, 0); | |
947 | goto out; | |
948 | } | |
17926a79 | 949 | |
a4ea4c47 | 950 | if (after(hard_ack, call->acks_hard_ack)) { |
c479d5f2 DH |
951 | if (rxrpc_rotate_tx_window(call, hard_ack, &summary)) { |
952 | rxrpc_end_tx_phase(call, false, "ETA"); | |
c1e15b49 | 953 | goto out; |
c479d5f2 DH |
954 | } |
955 | } | |
17926a79 | 956 | |
70790dbe | 957 | if (nr_acks > 0) { |
d57a3a15 | 958 | if (offset > (int)skb->len - nr_acks) { |
c1e15b49 DH |
959 | rxrpc_proto_abort("XSA", call, 0); |
960 | goto out; | |
961 | } | |
d57a3a15 DH |
962 | |
963 | spin_lock(&call->acks_ack_lock); | |
964 | skb_old = call->acks_soft_tbl; | |
965 | call->acks_soft_tbl = skb; | |
966 | spin_unlock(&call->acks_ack_lock); | |
967 | ||
968 | rxrpc_input_soft_acks(call, skb->data + offset, first_soft_ack, | |
969 | nr_acks, &summary); | |
970 | skb_put = NULL; | |
971 | } else if (call->acks_soft_tbl) { | |
972 | spin_lock(&call->acks_ack_lock); | |
973 | skb_old = call->acks_soft_tbl; | |
974 | call->acks_soft_tbl = NULL; | |
975 | spin_unlock(&call->acks_ack_lock); | |
70790dbe DH |
976 | } |
977 | ||
a4ea4c47 | 978 | if (test_bit(RXRPC_CALL_TX_LAST, &call->flags) && |
a9f312d9 DH |
979 | summary.nr_acks == call->tx_top - hard_ack && |
980 | rxrpc_is_client_call(call)) | |
72f0c6fb DH |
981 | rxrpc_propose_ping(call, ack_serial, |
982 | rxrpc_propose_ack_ping_for_lost_reply); | |
57494343 | 983 | |
c1e15b49 DH |
984 | rxrpc_congestion_management(call, skb, &summary, acked_serial); |
985 | out: | |
986 | spin_unlock(&call->input_lock); | |
d57a3a15 DH |
987 | out_not_locked: |
988 | rxrpc_free_skb(skb_put, rxrpc_skb_freed); | |
989 | rxrpc_free_skb(skb_old, rxrpc_skb_freed); | |
17926a79 DH |
990 | } |
991 | ||
992 | /* | |
248f219c | 993 | * Process an ACKALL packet. |
17926a79 | 994 | */ |
248f219c | 995 | static void rxrpc_input_ackall(struct rxrpc_call *call, struct sk_buff *skb) |
17926a79 | 996 | { |
31a1b989 | 997 | struct rxrpc_ack_summary summary = { 0 }; |
248f219c | 998 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
17926a79 | 999 | |
248f219c | 1000 | _proto("Rx ACKALL %%%u", sp->hdr.serial); |
17926a79 | 1001 | |
c1e15b49 DH |
1002 | spin_lock(&call->input_lock); |
1003 | ||
c479d5f2 | 1004 | if (rxrpc_rotate_tx_window(call, call->tx_top, &summary)) |
70790dbe | 1005 | rxrpc_end_tx_phase(call, false, "ETL"); |
c1e15b49 DH |
1006 | |
1007 | spin_unlock(&call->input_lock); | |
248f219c | 1008 | } |
17926a79 | 1009 | |
248f219c | 1010 | /* |
005ede28 | 1011 | * Process an ABORT packet directed at a call. |
248f219c DH |
1012 | */ |
1013 | static void rxrpc_input_abort(struct rxrpc_call *call, struct sk_buff *skb) | |
1014 | { | |
1015 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
1016 | __be32 wtmp; | |
1017 | u32 abort_code = RX_CALL_DEAD; | |
17926a79 | 1018 | |
248f219c | 1019 | _enter(""); |
17926a79 | 1020 | |
248f219c | 1021 | if (skb->len >= 4 && |
775e5b71 DH |
1022 | skb_copy_bits(skb, sizeof(struct rxrpc_wire_header), |
1023 | &wtmp, sizeof(wtmp)) >= 0) | |
248f219c | 1024 | abort_code = ntohl(wtmp); |
17926a79 | 1025 | |
005ede28 DH |
1026 | trace_rxrpc_rx_abort(call, sp->hdr.serial, abort_code); |
1027 | ||
248f219c | 1028 | _proto("Rx ABORT %%%u { %x }", sp->hdr.serial, abort_code); |
17926a79 | 1029 | |
5ac0d622 DH |
1030 | rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED, |
1031 | abort_code, -ECONNABORTED); | |
17926a79 DH |
1032 | } |
1033 | ||
1034 | /* | |
248f219c | 1035 | * Process an incoming call packet. |
17926a79 | 1036 | */ |
248f219c | 1037 | static void rxrpc_input_call_packet(struct rxrpc_call *call, |
e8c3af6b | 1038 | struct sk_buff *skb) |
17926a79 | 1039 | { |
248f219c | 1040 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
a158bdd3 | 1041 | unsigned long timo; |
17926a79 | 1042 | |
7727640c | 1043 | _enter("%p,%p", call, skb); |
17926a79 | 1044 | |
a158bdd3 DH |
1045 | timo = READ_ONCE(call->next_rx_timo); |
1046 | if (timo) { | |
1047 | unsigned long now = jiffies, expect_rx_by; | |
1048 | ||
c54e43d7 | 1049 | expect_rx_by = now + timo; |
a158bdd3 DH |
1050 | WRITE_ONCE(call->expect_rx_by, expect_rx_by); |
1051 | rxrpc_reduce_call_timer(call, expect_rx_by, now, | |
1052 | rxrpc_timer_set_for_normal); | |
1053 | } | |
3d7682af | 1054 | |
248f219c DH |
1055 | switch (sp->hdr.type) { |
1056 | case RXRPC_PACKET_TYPE_DATA: | |
e8c3af6b | 1057 | rxrpc_input_data(call, skb); |
4858e403 | 1058 | goto no_free; |
f5c17aae | 1059 | |
248f219c | 1060 | case RXRPC_PACKET_TYPE_ACK: |
e8c3af6b | 1061 | rxrpc_input_ack(call, skb); |
d57a3a15 | 1062 | goto no_free; |
17926a79 | 1063 | |
248f219c DH |
1064 | case RXRPC_PACKET_TYPE_BUSY: |
1065 | _proto("Rx BUSY %%%u", sp->hdr.serial); | |
17926a79 | 1066 | |
248f219c DH |
1067 | /* Just ignore BUSY packets from the server; the retry and |
1068 | * lifespan timers will take care of business. BUSY packets | |
1069 | * from the client don't make sense. | |
1070 | */ | |
1071 | break; | |
17926a79 | 1072 | |
248f219c DH |
1073 | case RXRPC_PACKET_TYPE_ABORT: |
1074 | rxrpc_input_abort(call, skb); | |
1075 | break; | |
17926a79 | 1076 | |
248f219c DH |
1077 | case RXRPC_PACKET_TYPE_ACKALL: |
1078 | rxrpc_input_ackall(call, skb); | |
1079 | break; | |
f5c17aae | 1080 | |
248f219c | 1081 | default: |
248f219c | 1082 | break; |
17926a79 | 1083 | } |
248f219c | 1084 | |
987db9f7 | 1085 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
4858e403 | 1086 | no_free: |
17926a79 DH |
1087 | _leave(""); |
1088 | } | |
1089 | ||
b3156274 | 1090 | /* |
c1e15b49 DH |
1091 | * Handle a new service call on a channel implicitly completing the preceding |
1092 | * call on that channel. This does not apply to client conns. | |
b3156274 DH |
1093 | * |
1094 | * TODO: If callNumber > call_id + 1, renegotiate security. | |
1095 | */ | |
c1e15b49 DH |
1096 | static void rxrpc_input_implicit_end_call(struct rxrpc_sock *rx, |
1097 | struct rxrpc_connection *conn, | |
b3156274 DH |
1098 | struct rxrpc_call *call) |
1099 | { | |
146d8fef | 1100 | switch (READ_ONCE(call->state)) { |
b3156274 DH |
1101 | case RXRPC_CALL_SERVER_AWAIT_ACK: |
1102 | rxrpc_call_completed(call); | |
df561f66 | 1103 | fallthrough; |
b3156274 DH |
1104 | case RXRPC_CALL_COMPLETE: |
1105 | break; | |
1106 | default: | |
3a92789a | 1107 | if (rxrpc_abort_call("IMP", call, 0, RX_CALL_DEAD, -ESHUTDOWN)) { |
b3156274 DH |
1108 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
1109 | rxrpc_queue_call(call); | |
1110 | } | |
c1e15b49 | 1111 | trace_rxrpc_improper_term(call); |
b3156274 DH |
1112 | break; |
1113 | } | |
1114 | ||
c1e15b49 | 1115 | spin_lock(&rx->incoming_lock); |
b3156274 | 1116 | __rxrpc_disconnect_call(conn, call); |
c1e15b49 | 1117 | spin_unlock(&rx->incoming_lock); |
b3156274 DH |
1118 | } |
1119 | ||
17926a79 DH |
1120 | /* |
1121 | * post connection-level events to the connection | |
18bfeba5 DH |
1122 | * - this includes challenges, responses, some aborts and call terminal packet |
1123 | * retransmission. | |
17926a79 | 1124 | */ |
2e7e9758 | 1125 | static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn, |
17926a79 DH |
1126 | struct sk_buff *skb) |
1127 | { | |
1128 | _enter("%p,%p", conn, skb); | |
1129 | ||
17926a79 | 1130 | skb_queue_tail(&conn->rx_queue, skb); |
2e7e9758 | 1131 | rxrpc_queue_conn(conn); |
17926a79 DH |
1132 | } |
1133 | ||
44ba0698 DH |
1134 | /* |
1135 | * post endpoint-level events to the local endpoint | |
1136 | * - this includes debug and version messages | |
1137 | */ | |
1138 | static void rxrpc_post_packet_to_local(struct rxrpc_local *local, | |
1139 | struct sk_buff *skb) | |
1140 | { | |
1141 | _enter("%p,%p", local, skb); | |
1142 | ||
730c5fd4 DH |
1143 | if (rxrpc_get_local_maybe(local)) { |
1144 | skb_queue_tail(&local->event_queue, skb); | |
1145 | rxrpc_queue_local(local); | |
1146 | } else { | |
987db9f7 | 1147 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
730c5fd4 | 1148 | } |
44ba0698 DH |
1149 | } |
1150 | ||
248f219c DH |
1151 | /* |
1152 | * put a packet up for transport-level abort | |
1153 | */ | |
1154 | static void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb) | |
1155 | { | |
730c5fd4 DH |
1156 | if (rxrpc_get_local_maybe(local)) { |
1157 | skb_queue_tail(&local->reject_queue, skb); | |
1158 | rxrpc_queue_local(local); | |
1159 | } else { | |
987db9f7 | 1160 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
730c5fd4 | 1161 | } |
248f219c DH |
1162 | } |
1163 | ||
0d12f8a4 DH |
1164 | /* |
1165 | * Extract the wire header from a packet and translate the byte order. | |
1166 | */ | |
1167 | static noinline | |
1168 | int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb) | |
1169 | { | |
1170 | struct rxrpc_wire_header whdr; | |
1171 | ||
1172 | /* dig out the RxRPC connection details */ | |
fb46f6ee DH |
1173 | if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0) { |
1174 | trace_rxrpc_rx_eproto(NULL, sp->hdr.serial, | |
1175 | tracepoint_string("bad_hdr")); | |
0d12f8a4 | 1176 | return -EBADMSG; |
fb46f6ee | 1177 | } |
0d12f8a4 DH |
1178 | |
1179 | memset(sp, 0, sizeof(*sp)); | |
1180 | sp->hdr.epoch = ntohl(whdr.epoch); | |
1181 | sp->hdr.cid = ntohl(whdr.cid); | |
1182 | sp->hdr.callNumber = ntohl(whdr.callNumber); | |
1183 | sp->hdr.seq = ntohl(whdr.seq); | |
1184 | sp->hdr.serial = ntohl(whdr.serial); | |
1185 | sp->hdr.flags = whdr.flags; | |
1186 | sp->hdr.type = whdr.type; | |
1187 | sp->hdr.userStatus = whdr.userStatus; | |
1188 | sp->hdr.securityIndex = whdr.securityIndex; | |
1189 | sp->hdr._rsvd = ntohs(whdr._rsvd); | |
1190 | sp->hdr.serviceId = ntohs(whdr.serviceId); | |
1191 | return 0; | |
1192 | } | |
1193 | ||
17926a79 DH |
1194 | /* |
1195 | * handle data received on the local endpoint | |
1196 | * - may be called in interrupt context | |
4f95dd78 | 1197 | * |
032be5f1 ED |
1198 | * [!] Note that as this is called from the encap_rcv hook, the socket is not |
1199 | * held locked by the caller and nothing prevents sk_user_data on the UDP from | |
1200 | * being cleared in the middle of processing this function. | |
bfd28211 DH |
1201 | * |
1202 | * Called with the RCU read lock held from the IP layer via UDP. | |
17926a79 | 1203 | */ |
5271953c | 1204 | int rxrpc_input_packet(struct sock *udp_sk, struct sk_buff *skb) |
17926a79 | 1205 | { |
032be5f1 | 1206 | struct rxrpc_local *local = rcu_dereference_sk_user_data(udp_sk); |
8496af50 | 1207 | struct rxrpc_connection *conn; |
248f219c | 1208 | struct rxrpc_channel *chan; |
403fc2a1 | 1209 | struct rxrpc_call *call = NULL; |
17926a79 | 1210 | struct rxrpc_skb_priv *sp; |
0099dc58 DH |
1211 | struct rxrpc_peer *peer = NULL; |
1212 | struct rxrpc_sock *rx = NULL; | |
248f219c | 1213 | unsigned int channel; |
17926a79 | 1214 | |
248f219c | 1215 | _enter("%p", udp_sk); |
17926a79 | 1216 | |
032be5f1 ED |
1217 | if (unlikely(!local)) { |
1218 | kfree_skb(skb); | |
1219 | return 0; | |
1220 | } | |
b604dd98 DH |
1221 | if (skb->tstamp == 0) |
1222 | skb->tstamp = ktime_get_real(); | |
1223 | ||
987db9f7 | 1224 | rxrpc_new_skb(skb, rxrpc_skb_received); |
17926a79 | 1225 | |
5271953c | 1226 | skb_pull(skb, sizeof(struct udphdr)); |
1781f7f5 | 1227 | |
7c13f97f PA |
1228 | /* The UDP protocol already released all skb resources; |
1229 | * we are free to add our own data there. | |
0d12f8a4 | 1230 | */ |
17926a79 | 1231 | sp = rxrpc_skb(skb); |
17926a79 | 1232 | |
89b475ab DH |
1233 | /* dig out the RxRPC connection details */ |
1234 | if (rxrpc_extract_header(sp, skb) < 0) | |
1235 | goto bad_message; | |
1236 | ||
8a681c36 DH |
1237 | if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) { |
1238 | static int lose; | |
1239 | if ((lose++ & 7) == 7) { | |
89b475ab | 1240 | trace_rxrpc_rx_lose(sp); |
987db9f7 | 1241 | rxrpc_free_skb(skb, rxrpc_skb_lost); |
5271953c | 1242 | return 0; |
8a681c36 DH |
1243 | } |
1244 | } | |
1245 | ||
2cfa2271 DH |
1246 | if (skb->tstamp == 0) |
1247 | skb->tstamp = ktime_get_real(); | |
49e19ec7 | 1248 | trace_rxrpc_rx_packet(sp); |
17926a79 | 1249 | |
248f219c DH |
1250 | switch (sp->hdr.type) { |
1251 | case RXRPC_PACKET_TYPE_VERSION: | |
dc71db34 | 1252 | if (rxrpc_to_client(sp)) |
ace45bec | 1253 | goto discard; |
44ba0698 DH |
1254 | rxrpc_post_packet_to_local(local, skb); |
1255 | goto out; | |
bc6e1ea3 | 1256 | |
248f219c | 1257 | case RXRPC_PACKET_TYPE_BUSY: |
dc71db34 | 1258 | if (rxrpc_to_server(sp)) |
248f219c | 1259 | goto discard; |
df561f66 | 1260 | fallthrough; |
403fc2a1 DH |
1261 | case RXRPC_PACKET_TYPE_ACK: |
1262 | case RXRPC_PACKET_TYPE_ACKALL: | |
1263 | if (sp->hdr.callNumber == 0) | |
1264 | goto bad_message; | |
df561f66 | 1265 | fallthrough; |
403fc2a1 DH |
1266 | case RXRPC_PACKET_TYPE_ABORT: |
1267 | break; | |
248f219c DH |
1268 | |
1269 | case RXRPC_PACKET_TYPE_DATA: | |
403fc2a1 DH |
1270 | if (sp->hdr.callNumber == 0 || |
1271 | sp->hdr.seq == 0) | |
248f219c | 1272 | goto bad_message; |
d0d5c0cd DH |
1273 | |
1274 | /* Unshare the packet so that it can be modified for in-place | |
1275 | * decryption. | |
1276 | */ | |
1277 | if (sp->hdr.securityIndex != 0) { | |
1278 | struct sk_buff *nskb = skb_unshare(skb, GFP_ATOMIC); | |
1279 | if (!nskb) { | |
1280 | rxrpc_eaten_skb(skb, rxrpc_skb_unshared_nomem); | |
1281 | goto out; | |
1282 | } | |
1283 | ||
1284 | if (nskb != skb) { | |
1285 | rxrpc_eaten_skb(skb, rxrpc_skb_received); | |
d0d5c0cd | 1286 | skb = nskb; |
59132894 | 1287 | rxrpc_new_skb(skb, rxrpc_skb_unshared); |
d0d5c0cd DH |
1288 | sp = rxrpc_skb(skb); |
1289 | } | |
1290 | } | |
248f219c | 1291 | break; |
b41d7cfe | 1292 | |
403fc2a1 DH |
1293 | case RXRPC_PACKET_TYPE_CHALLENGE: |
1294 | if (rxrpc_to_server(sp)) | |
1295 | goto discard; | |
1296 | break; | |
1297 | case RXRPC_PACKET_TYPE_RESPONSE: | |
1298 | if (rxrpc_to_client(sp)) | |
1299 | goto discard; | |
1300 | break; | |
1301 | ||
b41d7cfe DH |
1302 | /* Packet types 9-11 should just be ignored. */ |
1303 | case RXRPC_PACKET_TYPE_PARAMS: | |
1304 | case RXRPC_PACKET_TYPE_10: | |
1305 | case RXRPC_PACKET_TYPE_11: | |
1306 | goto discard; | |
403fc2a1 DH |
1307 | |
1308 | default: | |
1309 | _proto("Rx Bad Packet Type %u", sp->hdr.type); | |
1310 | goto bad_message; | |
248f219c | 1311 | } |
17926a79 | 1312 | |
403fc2a1 DH |
1313 | if (sp->hdr.serviceId == 0) |
1314 | goto bad_message; | |
1315 | ||
403fc2a1 DH |
1316 | if (rxrpc_to_server(sp)) { |
1317 | /* Weed out packets to services we're not offering. Packets | |
1318 | * that would begin a call are explicitly rejected and the rest | |
1319 | * are just discarded. | |
1320 | */ | |
1321 | rx = rcu_dereference(local->service); | |
1322 | if (!rx || (sp->hdr.serviceId != rx->srx.srx_service && | |
1323 | sp->hdr.serviceId != rx->second_service)) { | |
1324 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && | |
1325 | sp->hdr.seq == 1) | |
1326 | goto unsupported_service; | |
bfd28211 | 1327 | goto discard; |
403fc2a1 DH |
1328 | } |
1329 | } | |
1330 | ||
0099dc58 | 1331 | conn = rxrpc_find_connection_rcu(local, skb, &peer); |
248f219c DH |
1332 | if (conn) { |
1333 | if (sp->hdr.securityIndex != conn->security_ix) | |
1334 | goto wrong_security; | |
563ea7d5 | 1335 | |
4e255721 | 1336 | if (sp->hdr.serviceId != conn->service_id) { |
c1e15b49 DH |
1337 | int old_id; |
1338 | ||
1339 | if (!test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags)) | |
1340 | goto reupgrade; | |
1341 | old_id = cmpxchg(&conn->service_id, conn->params.service_id, | |
1342 | sp->hdr.serviceId); | |
1343 | ||
1344 | if (old_id != conn->params.service_id && | |
1345 | old_id != sp->hdr.serviceId) | |
4e255721 | 1346 | goto reupgrade; |
4e255721 | 1347 | } |
3d7682af | 1348 | |
248f219c DH |
1349 | if (sp->hdr.callNumber == 0) { |
1350 | /* Connection-level packet */ | |
1351 | _debug("CONN %p {%d}", conn, conn->debug_id); | |
1352 | rxrpc_post_packet_to_conn(conn, skb); | |
bfd28211 | 1353 | goto out; |
248f219c DH |
1354 | } |
1355 | ||
e8c3af6b DH |
1356 | if ((int)sp->hdr.serial - (int)conn->hi_serial > 0) |
1357 | conn->hi_serial = sp->hdr.serial; | |
17926a79 | 1358 | |
8496af50 | 1359 | /* Call-bound packets are routed by connection channel. */ |
248f219c DH |
1360 | channel = sp->hdr.cid & RXRPC_CHANNELMASK; |
1361 | chan = &conn->channels[channel]; | |
18bfeba5 DH |
1362 | |
1363 | /* Ignore really old calls */ | |
1364 | if (sp->hdr.callNumber < chan->last_call) | |
bfd28211 | 1365 | goto discard; |
18bfeba5 DH |
1366 | |
1367 | if (sp->hdr.callNumber == chan->last_call) { | |
57b0c9d4 DH |
1368 | if (chan->call || |
1369 | sp->hdr.type == RXRPC_PACKET_TYPE_ABORT) | |
bfd28211 | 1370 | goto discard; |
57b0c9d4 DH |
1371 | |
1372 | /* For the previous service call, if completed | |
1373 | * successfully, we discard all further packets. | |
18bfeba5 | 1374 | */ |
2266ffde | 1375 | if (rxrpc_conn_is_service(conn) && |
57b0c9d4 | 1376 | chan->last_type == RXRPC_PACKET_TYPE_ACK) |
bfd28211 | 1377 | goto discard; |
18bfeba5 | 1378 | |
57b0c9d4 DH |
1379 | /* But otherwise we need to retransmit the final packet |
1380 | * from data cached in the connection record. | |
18bfeba5 | 1381 | */ |
4764c0da DH |
1382 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) |
1383 | trace_rxrpc_rx_data(chan->call_debug_id, | |
1384 | sp->hdr.seq, | |
1385 | sp->hdr.serial, | |
d4d02d8b | 1386 | sp->hdr.flags); |
18bfeba5 | 1387 | rxrpc_post_packet_to_conn(conn, skb); |
bfd28211 | 1388 | goto out; |
18bfeba5 | 1389 | } |
0d12f8a4 | 1390 | |
18bfeba5 | 1391 | call = rcu_dereference(chan->call); |
b3156274 DH |
1392 | |
1393 | if (sp->hdr.callNumber > chan->call_id) { | |
bfd28211 | 1394 | if (rxrpc_to_client(sp)) |
b3156274 | 1395 | goto reject_packet; |
b3156274 | 1396 | if (call) |
c1e15b49 | 1397 | rxrpc_input_implicit_end_call(rx, conn, call); |
b3156274 DH |
1398 | call = NULL; |
1399 | } | |
4e255721 | 1400 | |
1a025028 DH |
1401 | if (call) { |
1402 | if (sp->hdr.serviceId != call->service_id) | |
1403 | call->service_id = sp->hdr.serviceId; | |
1404 | if ((int)sp->hdr.serial - (int)call->rx_serial > 0) | |
1405 | call->rx_serial = sp->hdr.serial; | |
1406 | if (!test_bit(RXRPC_CALL_RX_HEARD, &call->flags)) | |
1407 | set_bit(RXRPC_CALL_RX_HEARD, &call->flags); | |
1408 | } | |
248f219c | 1409 | } |
8496af50 | 1410 | |
a0575429 | 1411 | if (!call || refcount_read(&call->ref) == 0) { |
dc71db34 | 1412 | if (rxrpc_to_client(sp) || |
248f219c | 1413 | sp->hdr.type != RXRPC_PACKET_TYPE_DATA) |
bfd28211 | 1414 | goto bad_message; |
248f219c | 1415 | if (sp->hdr.seq != 1) |
bfd28211 | 1416 | goto discard; |
c1e15b49 | 1417 | call = rxrpc_new_incoming_call(local, rx, skb); |
bfd28211 | 1418 | if (!call) |
248f219c | 1419 | goto reject_packet; |
7727640c | 1420 | } |
44ba0698 | 1421 | |
4858e403 DH |
1422 | /* Process a call packet; this either discards or passes on the ref |
1423 | * elsewhere. | |
1424 | */ | |
e8c3af6b | 1425 | rxrpc_input_call_packet(call, skb); |
4858e403 | 1426 | goto out; |
248f219c | 1427 | |
248f219c | 1428 | discard: |
987db9f7 | 1429 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
44ba0698 | 1430 | out: |
49e19ec7 | 1431 | trace_rxrpc_rx_done(0, 0); |
5271953c | 1432 | return 0; |
8496af50 | 1433 | |
248f219c | 1434 | wrong_security: |
a25e21f0 | 1435 | trace_rxrpc_abort(0, "SEC", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, |
248f219c DH |
1436 | RXKADINCONSISTENCY, EBADMSG); |
1437 | skb->priority = RXKADINCONSISTENCY; | |
1438 | goto post_abort; | |
17926a79 | 1439 | |
403fc2a1 | 1440 | unsupported_service: |
403fc2a1 DH |
1441 | trace_rxrpc_abort(0, "INV", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, |
1442 | RX_INVALID_OPERATION, EOPNOTSUPP); | |
1443 | skb->priority = RX_INVALID_OPERATION; | |
1444 | goto post_abort; | |
1445 | ||
4e255721 | 1446 | reupgrade: |
a25e21f0 | 1447 | trace_rxrpc_abort(0, "UPG", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, |
4e255721 DH |
1448 | RX_PROTOCOL_ERROR, EBADMSG); |
1449 | goto protocol_error; | |
1450 | ||
17926a79 | 1451 | bad_message: |
a25e21f0 | 1452 | trace_rxrpc_abort(0, "BAD", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, |
248f219c | 1453 | RX_PROTOCOL_ERROR, EBADMSG); |
4e255721 | 1454 | protocol_error: |
17926a79 | 1455 | skb->priority = RX_PROTOCOL_ERROR; |
248f219c | 1456 | post_abort: |
ece64fec | 1457 | skb->mark = RXRPC_SKB_MARK_REJECT_ABORT; |
49e19ec7 DH |
1458 | reject_packet: |
1459 | trace_rxrpc_rx_done(skb->mark, skb->priority); | |
17926a79 | 1460 | rxrpc_reject_packet(local, skb); |
17926a79 | 1461 | _leave(" [badmsg]"); |
5271953c | 1462 | return 0; |
17926a79 | 1463 | } |