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Thomas Gleixner2874c5f2019-05-27 08:55:01 +02001// SPDX-License-Identifier: GPL-2.0-or-later
David Howells17926a72007-04-26 15:48:28 -07002/* RxRPC packet reception
3 *
David Howells248f2192016-09-08 11:10:12 +01004 * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved.
David Howells17926a72007-04-26 15:48:28 -07005 * Written by David Howells (dhowells@redhat.com)
David Howells17926a72007-04-26 15:48:28 -07006 */
7
Joe Perches9b6d5392016-06-02 12:08:52 -07008#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
David Howells17926a72007-04-26 15:48:28 -070010#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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090018#include <linux/gfp.h>
David Howells17926a72007-04-26 15:48:28 -070019#include <net/sock.h>
20#include <net/af_rxrpc.h>
21#include <net/ip.h>
Herbert Xu1781f7f2007-12-11 11:30:32 -080022#include <net/udp.h>
Pavel Emelyanov02833282008-07-05 21:18:48 -070023#include <net/net_namespace.h>
David Howells17926a72007-04-26 15:48:28 -070024#include "ar-internal.h"
25
David Howells248f2192016-09-08 11:10:12 +010026static void rxrpc_proto_abort(const char *why,
27 struct rxrpc_call *call, rxrpc_seq_t seq)
David Howells17926a72007-04-26 15:48:28 -070028{
David Howells3a927892017-04-06 10:11:56 +010029 if (rxrpc_abort_call(why, call, seq, RX_PROTOCOL_ERROR, -EBADMSG)) {
David Howells248f2192016-09-08 11:10:12 +010030 set_bit(RXRPC_CALL_EV_ABORT, &call->events);
31 rxrpc_queue_call(call);
David Howells17926a72007-04-26 15:48:28 -070032 }
David Howells17926a72007-04-26 15:48:28 -070033}
34
35/*
David Howells57494342016-09-24 18:05:27 +010036 * Do TCP-style congestion management [RFC 5681].
37 */
38static void rxrpc_congestion_management(struct rxrpc_call *call,
39 struct sk_buff *skb,
David Howellsed1e8672016-09-29 22:37:16 +010040 struct rxrpc_ack_summary *summary,
41 rxrpc_serial_t acked_serial)
David Howells57494342016-09-24 18:05:27 +010042{
43 enum rxrpc_congest_change change = rxrpc_cong_no_change;
David Howells57494342016-09-24 18:05:27 +010044 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;
David Howells8782def2016-09-30 09:26:12 +010056 if (cwnd >= call->cong_ssthresh &&
David Howells57494342016-09-24 18:05:27 +010057 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;
David Howells8782def2016-09-30 09:26:12 +010081 if (cwnd >= call->cong_ssthresh) {
David Howells57494342016-09-24 18:05:27 +010082 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 */
94 if (call->peer->rtt_usage == 0)
95 goto out;
96 if (ktime_before(skb->tstamp,
97 ktime_add_ns(call->cong_tstamp,
98 call->peer->rtt)))
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
155resume_normality:
156 change = rxrpc_cong_cleared_nacks;
157 call->cong_dup_acks = 0;
158 call->cong_extra = 0;
159 call->cong_tstamp = skb->tstamp;
David Howells8782def2016-09-30 09:26:12 +0100160 if (cwnd < call->cong_ssthresh)
David Howells57494342016-09-24 18:05:27 +0100161 call->cong_mode = RXRPC_CALL_SLOW_START;
162 else
163 call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE;
164out:
165 cumulative_acks = 0;
166out_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;
David Howellsed1e8672016-09-29 22:37:16 +0100171 trace_rxrpc_congest(call, summary, acked_serial, change);
David Howells57494342016-09-24 18:05:27 +0100172 if (resend && !test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
173 rxrpc_queue_call(call);
174 return;
175
176packet_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
182send_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
195/*
David Howells248f2192016-09-08 11:10:12 +0100196 * Apply a hard ACK by advancing the Tx window.
David Howells17926a72007-04-26 15:48:28 -0700197 */
David Howellsc479d5f2018-10-08 15:46:01 +0100198static bool rxrpc_rotate_tx_window(struct rxrpc_call *call, rxrpc_seq_t to,
David Howells31a1b9892016-09-24 18:05:26 +0100199 struct rxrpc_ack_summary *summary)
David Howells17926a72007-04-26 15:48:28 -0700200{
David Howells248f2192016-09-08 11:10:12 +0100201 struct sk_buff *skb, *list = NULL;
David Howellsc479d5f2018-10-08 15:46:01 +0100202 bool rot_last = false;
David Howells248f2192016-09-08 11:10:12 +0100203 int ix;
David Howells70790dbe2016-09-23 12:39:22 +0100204 u8 annotation;
David Howells17926a72007-04-26 15:48:28 -0700205
David Howells31a1b9892016-09-24 18:05:26 +0100206 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
David Howells17926a72007-04-26 15:48:28 -0700213 spin_lock(&call->lock);
214
David Howells248f2192016-09-08 11:10:12 +0100215 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];
David Howells70790dbe2016-09-23 12:39:22 +0100219 annotation = call->rxtx_annotations[ix];
David Howells987db9f2019-08-19 09:25:38 +0100220 rxrpc_see_skb(skb, rxrpc_skb_rotated);
David Howells248f2192016-09-08 11:10:12 +0100221 call->rxtx_buffer[ix] = NULL;
222 call->rxtx_annotations[ix] = 0;
223 skb->next = list;
224 list = skb;
David Howells70790dbe2016-09-23 12:39:22 +0100225
David Howellsc479d5f2018-10-08 15:46:01 +0100226 if (annotation & RXRPC_TX_ANNO_LAST) {
David Howells70790dbe2016-09-23 12:39:22 +0100227 set_bit(RXRPC_CALL_TX_LAST, &call->flags);
David Howellsc479d5f2018-10-08 15:46:01 +0100228 rot_last = true;
229 }
David Howells31a1b9892016-09-24 18:05:26 +0100230 if ((annotation & RXRPC_TX_ANNO_MASK) != RXRPC_TX_ANNO_ACK)
231 summary->nr_rot_new_acks++;
David Howells17926a72007-04-26 15:48:28 -0700232 }
233
234 spin_unlock(&call->lock);
David Howells17926a72007-04-26 15:48:28 -0700235
David Howellsc479d5f2018-10-08 15:46:01 +0100236 trace_rxrpc_transmit(call, (rot_last ?
David Howells70790dbe2016-09-23 12:39:22 +0100237 rxrpc_transmit_rotate_last :
238 rxrpc_transmit_rotate));
David Howellsbc4abfc2016-09-13 22:36:21 +0100239 wake_up(&call->waitq);
240
David Howells248f2192016-09-08 11:10:12 +0100241 while (list) {
242 skb = list;
243 list = skb->next;
David S. Millera8305bf2018-07-29 20:42:53 -0700244 skb_mark_not_on_list(skb);
David Howells987db9f2019-08-19 09:25:38 +0100245 rxrpc_free_skb(skb, rxrpc_skb_freed);
David Howells248f2192016-09-08 11:10:12 +0100246 }
David Howellsc479d5f2018-10-08 15:46:01 +0100247
248 return rot_last;
David Howells17926a72007-04-26 15:48:28 -0700249}
250
251/*
David Howells248f2192016-09-08 11:10:12 +0100252 * 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.
David Howells17926a72007-04-26 15:48:28 -0700256 */
David Howells70790dbe2016-09-23 12:39:22 +0100257static bool rxrpc_end_tx_phase(struct rxrpc_call *call, bool reply_begun,
258 const char *abort_why)
David Howells17926a72007-04-26 15:48:28 -0700259{
David Howellsdfe99522018-10-08 15:46:05 +0100260 unsigned int state;
David Howells17926a72007-04-26 15:48:28 -0700261
David Howells70790dbe2016-09-23 12:39:22 +0100262 ASSERT(test_bit(RXRPC_CALL_TX_LAST, &call->flags));
David Howells248f2192016-09-08 11:10:12 +0100263
264 write_lock(&call->state_lock);
265
David Howellsdfe99522018-10-08 15:46:05 +0100266 state = call->state;
267 switch (state) {
David Howells70790dbe2016-09-23 12:39:22 +0100268 case RXRPC_CALL_CLIENT_SEND_REQUEST:
David Howells17926a72007-04-26 15:48:28 -0700269 case RXRPC_CALL_CLIENT_AWAIT_REPLY:
David Howells70790dbe2016-09-23 12:39:22 +0100270 if (reply_begun)
David Howellsdfe99522018-10-08 15:46:05 +0100271 call->state = state = RXRPC_CALL_CLIENT_RECV_REPLY;
David Howells70790dbe2016-09-23 12:39:22 +0100272 else
David Howellsdfe99522018-10-08 15:46:05 +0100273 call->state = state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
David Howells17926a72007-04-26 15:48:28 -0700274 break;
David Howells70790dbe2016-09-23 12:39:22 +0100275
David Howells248f2192016-09-08 11:10:12 +0100276 case RXRPC_CALL_SERVER_AWAIT_ACK:
277 __rxrpc_call_completed(call);
278 rxrpc_notify_socket(call);
David Howellsdfe99522018-10-08 15:46:05 +0100279 state = call->state;
David Howells17926a72007-04-26 15:48:28 -0700280 break;
David Howells70790dbe2016-09-23 12:39:22 +0100281
282 default:
283 goto bad_state;
David Howells17926a72007-04-26 15:48:28 -0700284 }
David Howells248f2192016-09-08 11:10:12 +0100285
286 write_unlock(&call->state_lock);
David Howellsdfe99522018-10-08 15:46:05 +0100287 if (state == RXRPC_CALL_CLIENT_AWAIT_REPLY)
David Howells70790dbe2016-09-23 12:39:22 +0100288 trace_rxrpc_transmit(call, rxrpc_transmit_await_reply);
David Howellsdfe99522018-10-08 15:46:05 +0100289 else
David Howells70790dbe2016-09-23 12:39:22 +0100290 trace_rxrpc_transmit(call, rxrpc_transmit_end);
David Howells248f2192016-09-08 11:10:12 +0100291 _leave(" = ok");
292 return true;
David Howells70790dbe2016-09-23 12:39:22 +0100293
294bad_state:
295 write_unlock(&call->state_lock);
296 kdebug("end_tx %s", rxrpc_call_states[call->state]);
297 rxrpc_proto_abort(abort_why, call, call->tx_top);
298 return false;
299}
300
301/*
302 * Begin the reply reception phase of a call.
303 */
304static bool rxrpc_receiving_reply(struct rxrpc_call *call)
305{
David Howells31a1b9892016-09-24 18:05:26 +0100306 struct rxrpc_ack_summary summary = { 0 };
David Howellsa158bdd2017-11-24 10:18:41 +0000307 unsigned long now, timo;
David Howells70790dbe2016-09-23 12:39:22 +0100308 rxrpc_seq_t top = READ_ONCE(call->tx_top);
309
David Howellsdd7c1ee2016-09-24 18:05:27 +0100310 if (call->ackr_reason) {
311 spin_lock_bh(&call->lock);
312 call->ackr_reason = 0;
David Howellsdd7c1ee2016-09-24 18:05:27 +0100313 spin_unlock_bh(&call->lock);
David Howellsa158bdd2017-11-24 10:18:41 +0000314 now = jiffies;
315 timo = now + MAX_JIFFY_OFFSET;
316 WRITE_ONCE(call->resend_at, timo);
317 WRITE_ONCE(call->ack_at, timo);
318 trace_rxrpc_timer(call, rxrpc_timer_init_for_reply, now);
David Howellsdd7c1ee2016-09-24 18:05:27 +0100319 }
320
David Howells70790dbe2016-09-23 12:39:22 +0100321 if (!test_bit(RXRPC_CALL_TX_LAST, &call->flags)) {
David Howellsc479d5f2018-10-08 15:46:01 +0100322 if (!rxrpc_rotate_tx_window(call, top, &summary)) {
323 rxrpc_proto_abort("TXL", call, top);
324 return false;
325 }
David Howells70790dbe2016-09-23 12:39:22 +0100326 }
327 if (!rxrpc_end_tx_phase(call, true, "ETD"))
328 return false;
329 call->tx_phase = false;
330 return true;
David Howells248f2192016-09-08 11:10:12 +0100331}
332
333/*
David Howellsc3c9e3d2019-08-19 09:25:37 +0100334 * Scan a data packet to validate its structure and to work out how many
David Howells248f2192016-09-08 11:10:12 +0100335 * subpackets it contains.
336 *
337 * A jumbo packet is a collection of consecutive packets glued together with
338 * little headers between that indicate how to change the initial header for
339 * each subpacket.
340 *
341 * RXRPC_JUMBO_PACKET must be set on all but the last subpacket - and all but
342 * the last are RXRPC_JUMBO_DATALEN in size. The last subpacket may be of any
343 * size.
344 */
David Howellsc3c9e3d2019-08-19 09:25:37 +0100345static bool rxrpc_validate_data(struct sk_buff *skb)
David Howells248f2192016-09-08 11:10:12 +0100346{
347 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
David Howells775e5b72016-09-30 13:26:03 +0100348 unsigned int offset = sizeof(struct rxrpc_wire_header);
David Howells89a80ed2016-09-13 22:36:22 +0100349 unsigned int len = skb->len;
David Howells248f2192016-09-08 11:10:12 +0100350 u8 flags = sp->hdr.flags;
351
David Howellsc3c9e3d2019-08-19 09:25:37 +0100352 for (;;) {
353 if (flags & RXRPC_REQUEST_ACK)
354 __set_bit(sp->nr_subpackets, sp->rx_req_ack);
355 sp->nr_subpackets++;
356
357 if (!(flags & RXRPC_JUMBO_PACKET))
358 break;
359
David Howells248f2192016-09-08 11:10:12 +0100360 if (len - offset < RXRPC_JUMBO_SUBPKTLEN)
361 goto protocol_error;
362 if (flags & RXRPC_LAST_PACKET)
363 goto protocol_error;
364 offset += RXRPC_JUMBO_DATALEN;
365 if (skb_copy_bits(skb, offset, &flags, 1) < 0)
366 goto protocol_error;
367 offset += sizeof(struct rxrpc_jumbo_header);
David Howellsc3c9e3d2019-08-19 09:25:37 +0100368 }
David Howells248f2192016-09-08 11:10:12 +0100369
David Howellsc3c9e3d2019-08-19 09:25:37 +0100370 if (flags & RXRPC_LAST_PACKET)
371 sp->rx_flags |= RXRPC_SKB_INCL_LAST;
David Howells248f2192016-09-08 11:10:12 +0100372 return true;
373
374protocol_error:
375 return false;
376}
377
378/*
379 * Handle reception of a duplicate packet.
380 *
381 * We have to take care to avoid an attack here whereby we're given a series of
382 * jumbograms, each with a sequence number one before the preceding one and
383 * filled up to maximum UDP size. If they never send us the first packet in
384 * the sequence, they can cause us to have to hold on to around 2MiB of kernel
385 * space until the call times out.
386 *
387 * We limit the space usage by only accepting three duplicate jumbo packets per
388 * call. After that, we tell the other side we're no longer accepting jumbos
389 * (that information is encoded in the ACK packet).
390 */
391static void rxrpc_input_dup_data(struct rxrpc_call *call, rxrpc_seq_t seq,
David Howellse2de6c402019-08-27 09:51:30 +0100392 bool is_jumbo, bool *_jumbo_bad)
David Howells248f2192016-09-08 11:10:12 +0100393{
394 /* Discard normal packets that are duplicates. */
David Howellse2de6c402019-08-27 09:51:30 +0100395 if (is_jumbo)
David Howells248f2192016-09-08 11:10:12 +0100396 return;
397
398 /* Skip jumbo subpackets that are duplicates. When we've had three or
399 * more partially duplicate jumbo packets, we refuse to take any more
400 * jumbos for this call.
401 */
David Howells75e42122016-09-13 22:36:22 +0100402 if (!*_jumbo_bad) {
403 call->nr_jumbo_bad++;
404 *_jumbo_bad = true;
David Howells248f2192016-09-08 11:10:12 +0100405 }
David Howells17926a72007-04-26 15:48:28 -0700406}
407
408/*
David Howells4858e402019-08-19 09:25:36 +0100409 * Process a DATA packet, adding the packet to the Rx ring. The caller's
410 * packet ref must be passed on or discarded.
David Howells17926a72007-04-26 15:48:28 -0700411 */
David Howellse8c3af62019-08-09 15:20:41 +0100412static void rxrpc_input_data(struct rxrpc_call *call, struct sk_buff *skb)
David Howells248f2192016-09-08 11:10:12 +0100413{
414 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
David Howells146d8fe2017-03-04 00:01:41 +0000415 enum rxrpc_call_state state;
David Howells122d74f2020-01-24 23:08:04 +0000416 unsigned int j, nr_subpackets;
David Howells248f2192016-09-08 11:10:12 +0100417 rxrpc_serial_t serial = sp->hdr.serial, ack_serial = 0;
David Howellse2de6c402019-08-27 09:51:30 +0100418 rxrpc_seq_t seq0 = sp->hdr.seq, hard_ack;
419 bool immediate_ack = false, jumbo_bad = false;
420 u8 ack = 0;
David Howells248f2192016-09-08 11:10:12 +0100421
422 _enter("{%u,%u},{%u,%u}",
David Howellse2de6c402019-08-27 09:51:30 +0100423 call->rx_hard_ack, call->rx_top, skb->len, seq0);
David Howells248f2192016-09-08 11:10:12 +0100424
David Howellse2de6c402019-08-27 09:51:30 +0100425 _proto("Rx DATA %%%u { #%u f=%02x n=%u }",
426 sp->hdr.serial, seq0, sp->hdr.flags, sp->nr_subpackets);
David Howells248f2192016-09-08 11:10:12 +0100427
David Howells146d8fe2017-03-04 00:01:41 +0000428 state = READ_ONCE(call->state);
David Howells4858e402019-08-19 09:25:36 +0100429 if (state >= RXRPC_CALL_COMPLETE) {
David Howells987db9f2019-08-19 09:25:38 +0100430 rxrpc_free_skb(skb, rxrpc_skb_freed);
David Howells248f2192016-09-08 11:10:12 +0100431 return;
David Howells4858e402019-08-19 09:25:36 +0100432 }
David Howells248f2192016-09-08 11:10:12 +0100433
David Howellsa158bdd2017-11-24 10:18:41 +0000434 if (call->state == RXRPC_CALL_SERVER_RECV_REQUEST) {
435 unsigned long timo = READ_ONCE(call->next_req_timo);
436 unsigned long now, expect_req_by;
437
438 if (timo) {
439 now = jiffies;
440 expect_req_by = now + timo;
441 WRITE_ONCE(call->expect_req_by, expect_req_by);
442 rxrpc_reduce_call_timer(call, expect_req_by, now,
443 rxrpc_timer_set_for_idle);
444 }
445 }
446
David Howellsc1e15b42018-10-08 15:46:25 +0100447 spin_lock(&call->input_lock);
448
David Howells248f2192016-09-08 11:10:12 +0100449 /* Received data implicitly ACKs all of the request packets we sent
450 * when we're acting as a client.
451 */
David Howells146d8fe2017-03-04 00:01:41 +0000452 if ((state == RXRPC_CALL_CLIENT_SEND_REQUEST ||
453 state == RXRPC_CALL_CLIENT_AWAIT_REPLY) &&
David Howells70790dbe2016-09-23 12:39:22 +0100454 !rxrpc_receiving_reply(call))
David Howellsc1e15b42018-10-08 15:46:25 +0100455 goto unlock;
David Howells248f2192016-09-08 11:10:12 +0100456
David Howellse2de6c402019-08-27 09:51:30 +0100457 call->ackr_prev_seq = seq0;
David Howells248f2192016-09-08 11:10:12 +0100458 hard_ack = READ_ONCE(call->rx_hard_ack);
David Howells248f2192016-09-08 11:10:12 +0100459
David Howells122d74f2020-01-24 23:08:04 +0000460 nr_subpackets = sp->nr_subpackets;
461 if (nr_subpackets > 1) {
David Howells75e42122016-09-13 22:36:22 +0100462 if (call->nr_jumbo_bad > 3) {
David Howells248f2192016-09-08 11:10:12 +0100463 ack = RXRPC_ACK_NOSPACE;
464 ack_serial = serial;
465 goto ack;
466 }
David Howells248f2192016-09-08 11:10:12 +0100467 }
468
David Howells122d74f2020-01-24 23:08:04 +0000469 for (j = 0; j < nr_subpackets; j++) {
David Howellse2de6c402019-08-27 09:51:30 +0100470 rxrpc_serial_t serial = sp->hdr.serial + j;
471 rxrpc_seq_t seq = seq0 + j;
472 unsigned int ix = seq & RXRPC_RXTX_BUFF_MASK;
David Howells122d74f2020-01-24 23:08:04 +0000473 bool terminal = (j == nr_subpackets - 1);
David Howellse2de6c402019-08-27 09:51:30 +0100474 bool last = terminal && (sp->rx_flags & RXRPC_SKB_INCL_LAST);
475 u8 flags, annotation = j;
David Howells248f2192016-09-08 11:10:12 +0100476
David Howellse2de6c402019-08-27 09:51:30 +0100477 _proto("Rx DATA+%u %%%u { #%x t=%u l=%u }",
478 j, serial, seq, terminal, last);
479
480 if (last) {
481 if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) &&
482 seq != call->rx_top) {
483 rxrpc_proto_abort("LSN", call, seq);
484 goto unlock;
485 }
486 } else {
487 if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) &&
488 after_eq(seq, call->rx_top)) {
489 rxrpc_proto_abort("LSA", call, seq);
490 goto unlock;
491 }
David Howellsc1e15b42018-10-08 15:46:25 +0100492 }
David Howells248f2192016-09-08 11:10:12 +0100493
David Howellse2de6c402019-08-27 09:51:30 +0100494 flags = 0;
495 if (last)
496 flags |= RXRPC_LAST_PACKET;
497 if (!terminal)
498 flags |= RXRPC_JUMBO_PACKET;
499 if (test_bit(j, sp->rx_req_ack))
500 flags |= RXRPC_REQUEST_ACK;
501 trace_rxrpc_rx_data(call->debug_id, seq, serial, flags, annotation);
David Howells248f2192016-09-08 11:10:12 +0100502
David Howellse2de6c402019-08-27 09:51:30 +0100503 if (before_eq(seq, hard_ack)) {
David Howells248f2192016-09-08 11:10:12 +0100504 ack = RXRPC_ACK_DUPLICATE;
505 ack_serial = serial;
David Howellse2de6c402019-08-27 09:51:30 +0100506 continue;
David Howells248f2192016-09-08 11:10:12 +0100507 }
David Howells248f2192016-09-08 11:10:12 +0100508
David Howellse2de6c402019-08-27 09:51:30 +0100509 if (call->rxtx_buffer[ix]) {
David Howells122d74f2020-01-24 23:08:04 +0000510 rxrpc_input_dup_data(call, seq, nr_subpackets > 1,
David Howellse2de6c402019-08-27 09:51:30 +0100511 &jumbo_bad);
512 if (ack != RXRPC_ACK_DUPLICATE) {
513 ack = RXRPC_ACK_DUPLICATE;
514 ack_serial = serial;
515 }
516 immediate_ack = true;
517 continue;
David Howellsa7056c52016-09-24 18:05:27 +0100518 }
David Howells248f2192016-09-08 11:10:12 +0100519
David Howells75e42122016-09-13 22:36:22 +0100520 if (after(seq, hard_ack + call->rx_winsize)) {
521 ack = RXRPC_ACK_EXCEEDS_WINDOW;
522 ack_serial = serial;
David Howellse2de6c402019-08-27 09:51:30 +0100523 if (flags & RXRPC_JUMBO_PACKET) {
524 if (!jumbo_bad) {
525 call->nr_jumbo_bad++;
526 jumbo_bad = true;
527 }
David Howells75e42122016-09-13 22:36:22 +0100528 }
David Howellse2de6c402019-08-27 09:51:30 +0100529
David Howells75e42122016-09-13 22:36:22 +0100530 goto ack;
531 }
David Howells248f2192016-09-08 11:10:12 +0100532
David Howellse2de6c402019-08-27 09:51:30 +0100533 if (flags & RXRPC_REQUEST_ACK && !ack) {
534 ack = RXRPC_ACK_REQUESTED;
535 ack_serial = serial;
536 }
David Howells248f2192016-09-08 11:10:12 +0100537
David Howellse2de6c402019-08-27 09:51:30 +0100538 /* Queue the packet. We use a couple of memory barriers here as need
539 * to make sure that rx_top is perceived to be set after the buffer
540 * pointer and that the buffer pointer is set after the annotation and
541 * the skb data.
542 *
543 * Barriers against rxrpc_recvmsg_data() and rxrpc_rotate_rx_window()
544 * and also rxrpc_fill_out_ack().
545 */
David Howells4858e402019-08-19 09:25:36 +0100546 if (!terminal)
David Howells987db9f2019-08-19 09:25:38 +0100547 rxrpc_get_skb(skb, rxrpc_skb_got);
David Howellse2de6c402019-08-27 09:51:30 +0100548 call->rxtx_annotations[ix] = annotation;
549 smp_wmb();
550 call->rxtx_buffer[ix] = skb;
551 if (after(seq, call->rx_top)) {
552 smp_store_release(&call->rx_top, seq);
553 } else if (before(seq, call->rx_top)) {
554 /* Send an immediate ACK if we fill in a hole */
555 if (!ack) {
556 ack = RXRPC_ACK_DELAY;
557 ack_serial = serial;
558 }
559 immediate_ack = true;
560 }
561
562 if (terminal) {
563 /* From this point on, we're not allowed to touch the
564 * packet any longer as its ref now belongs to the Rx
565 * ring.
566 */
567 skb = NULL;
David Howells122d74f2020-01-24 23:08:04 +0000568 sp = NULL;
David Howellse2de6c402019-08-27 09:51:30 +0100569 }
570
571 if (last) {
572 set_bit(RXRPC_CALL_RX_LAST, &call->flags);
573 if (!ack) {
574 ack = RXRPC_ACK_DELAY;
575 ack_serial = serial;
576 }
577 trace_rxrpc_receive(call, rxrpc_receive_queue_last, serial, seq);
578 } else {
579 trace_rxrpc_receive(call, rxrpc_receive_queue, serial, seq);
580 }
581
582 if (after_eq(seq, call->rx_expect_next)) {
583 if (after(seq, call->rx_expect_next)) {
584 _net("OOS %u > %u", seq, call->rx_expect_next);
585 ack = RXRPC_ACK_OUT_OF_SEQUENCE;
586 ack_serial = serial;
587 }
588 call->rx_expect_next = seq + 1;
589 }
David Howells248f2192016-09-08 11:10:12 +0100590 }
591
592ack:
593 if (ack)
David Howellse8c3af62019-08-09 15:20:41 +0100594 rxrpc_propose_ACK(call, ack, ack_serial,
David Howells9c7ad432016-09-23 13:50:40 +0100595 immediate_ack, true,
596 rxrpc_propose_ack_input_data);
David Howells4764c0d2018-07-23 17:18:37 +0100597 else
David Howellse8c3af62019-08-09 15:20:41 +0100598 rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, serial,
David Howells4764c0d2018-07-23 17:18:37 +0100599 false, true,
600 rxrpc_propose_ack_input_data);
David Howells248f2192016-09-08 11:10:12 +0100601
David Howellsf71dbf22020-01-30 21:50:36 +0000602 trace_rxrpc_notify_socket(call->debug_id, serial);
603 rxrpc_notify_socket(call);
David Howellsc1e15b42018-10-08 15:46:25 +0100604
605unlock:
606 spin_unlock(&call->input_lock);
David Howells987db9f2019-08-19 09:25:38 +0100607 rxrpc_free_skb(skb, rxrpc_skb_freed);
David Howells248f2192016-09-08 11:10:12 +0100608 _leave(" [queued]");
609}
610
611/*
David Howells50235c42016-09-22 00:29:31 +0100612 * Process a requested ACK.
613 */
614static void rxrpc_input_requested_ack(struct rxrpc_call *call,
615 ktime_t resp_time,
616 rxrpc_serial_t orig_serial,
617 rxrpc_serial_t ack_serial)
618{
619 struct rxrpc_skb_priv *sp;
620 struct sk_buff *skb;
621 ktime_t sent_at;
622 int ix;
623
624 for (ix = 0; ix < RXRPC_RXTX_BUFF_SIZE; ix++) {
625 skb = call->rxtx_buffer[ix];
626 if (!skb)
627 continue;
628
David Howellsb604dd92018-09-27 15:13:08 +0100629 sent_at = skb->tstamp;
630 smp_rmb(); /* Read timestamp before serial. */
David Howells50235c42016-09-22 00:29:31 +0100631 sp = rxrpc_skb(skb);
632 if (sp->hdr.serial != orig_serial)
633 continue;
David Howells50235c42016-09-22 00:29:31 +0100634 goto found;
635 }
David Howellsb604dd92018-09-27 15:13:08 +0100636
David Howells50235c42016-09-22 00:29:31 +0100637 return;
638
639found:
640 rxrpc_peer_add_rtt(call, rxrpc_rtt_rx_requested_ack,
641 orig_serial, ack_serial, sent_at, resp_time);
642}
643
644/*
David Howellsbd1fdf82017-11-24 10:18:42 +0000645 * Process the response to a ping that we sent to find out if we lost an ACK.
646 *
647 * If we got back a ping response that indicates a lower tx_top than what we
648 * had at the time of the ping transmission, we adjudge all the DATA packets
649 * sent between the response tx_top and the ping-time tx_top to have been lost.
650 */
651static void rxrpc_input_check_for_lost_ack(struct rxrpc_call *call)
652{
653 rxrpc_seq_t top, bottom, seq;
654 bool resend = false;
655
656 spin_lock_bh(&call->lock);
657
658 bottom = call->tx_hard_ack + 1;
659 top = call->acks_lost_top;
660 if (before(bottom, top)) {
661 for (seq = bottom; before_eq(seq, top); seq++) {
662 int ix = seq & RXRPC_RXTX_BUFF_MASK;
663 u8 annotation = call->rxtx_annotations[ix];
664 u8 anno_type = annotation & RXRPC_TX_ANNO_MASK;
665
666 if (anno_type != RXRPC_TX_ANNO_UNACK)
667 continue;
668 annotation &= ~RXRPC_TX_ANNO_MASK;
669 annotation |= RXRPC_TX_ANNO_RETRANS;
670 call->rxtx_annotations[ix] = annotation;
671 resend = true;
672 }
673 }
674
675 spin_unlock_bh(&call->lock);
676
677 if (resend && !test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
678 rxrpc_queue_call(call);
679}
680
681/*
David Howells8e831342016-09-22 00:29:31 +0100682 * Process a ping response.
683 */
684static void rxrpc_input_ping_response(struct rxrpc_call *call,
685 ktime_t resp_time,
686 rxrpc_serial_t orig_serial,
687 rxrpc_serial_t ack_serial)
688{
689 rxrpc_serial_t ping_serial;
690 ktime_t ping_time;
691
David Howellsa5af7e12016-10-06 08:11:49 +0100692 ping_time = call->ping_time;
David Howells8e831342016-09-22 00:29:31 +0100693 smp_rmb();
David Howellsc1e15b42018-10-08 15:46:25 +0100694 ping_serial = READ_ONCE(call->ping_serial);
David Howells8e831342016-09-22 00:29:31 +0100695
David Howellsbd1fdf82017-11-24 10:18:42 +0000696 if (orig_serial == call->acks_lost_ping)
697 rxrpc_input_check_for_lost_ack(call);
698
David Howellsc1e15b42018-10-08 15:46:25 +0100699 if (before(orig_serial, ping_serial) ||
700 !test_and_clear_bit(RXRPC_CALL_PINGING, &call->flags))
David Howells8e831342016-09-22 00:29:31 +0100701 return;
David Howells8e831342016-09-22 00:29:31 +0100702 if (after(orig_serial, ping_serial))
703 return;
704
705 rxrpc_peer_add_rtt(call, rxrpc_rtt_rx_ping_response,
706 orig_serial, ack_serial, ping_time, resp_time);
707}
708
709/*
David Howells248f2192016-09-08 11:10:12 +0100710 * Process the extra information that may be appended to an ACK packet
711 */
712static void rxrpc_input_ackinfo(struct rxrpc_call *call, struct sk_buff *skb,
713 struct rxrpc_ackinfo *ackinfo)
714{
715 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
716 struct rxrpc_peer *peer;
717 unsigned int mtu;
David Howells702f2ac2017-03-10 07:48:49 +0000718 bool wake = false;
David Howells01fd0742016-09-13 10:23:01 +0100719 u32 rwind = ntohl(ackinfo->rwind);
David Howells248f2192016-09-08 11:10:12 +0100720
721 _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }",
722 sp->hdr.serial,
723 ntohl(ackinfo->rxMTU), ntohl(ackinfo->maxMTU),
David Howells01fd0742016-09-13 10:23:01 +0100724 rwind, ntohl(ackinfo->jumbo_max));
David Howells248f2192016-09-08 11:10:12 +0100725
David Howells702f2ac2017-03-10 07:48:49 +0000726 if (call->tx_winsize != rwind) {
727 if (rwind > RXRPC_RXTX_BUFF_SIZE - 1)
728 rwind = RXRPC_RXTX_BUFF_SIZE - 1;
729 if (rwind > call->tx_winsize)
730 wake = true;
David Howells740586d2017-04-06 10:12:00 +0100731 trace_rxrpc_rx_rwind_change(call, sp->hdr.serial,
732 ntohl(ackinfo->rwind), wake);
David Howells702f2ac2017-03-10 07:48:49 +0000733 call->tx_winsize = rwind;
734 }
735
David Howells08511152016-09-30 09:33:27 +0100736 if (call->cong_ssthresh > rwind)
737 call->cong_ssthresh = rwind;
David Howells248f2192016-09-08 11:10:12 +0100738
739 mtu = min(ntohl(ackinfo->rxMTU), ntohl(ackinfo->maxMTU));
740
741 peer = call->peer;
742 if (mtu < peer->maxdata) {
743 spin_lock_bh(&peer->lock);
744 peer->maxdata = mtu;
745 peer->mtu = mtu + peer->hdrsize;
746 spin_unlock_bh(&peer->lock);
747 _net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata);
748 }
David Howells702f2ac2017-03-10 07:48:49 +0000749
750 if (wake)
751 wake_up(&call->waitq);
David Howells248f2192016-09-08 11:10:12 +0100752}
753
754/*
755 * Process individual soft ACKs.
756 *
757 * Each ACK in the array corresponds to one packet and can be either an ACK or
758 * a NAK. If we get find an explicitly NAK'd packet we resend immediately;
759 * packets that lie beyond the end of the ACK list are scheduled for resend by
760 * the timer on the basis that the peer might just not have processed them at
761 * the time the ACK was sent.
762 */
763static void rxrpc_input_soft_acks(struct rxrpc_call *call, u8 *acks,
David Howells31a1b9892016-09-24 18:05:26 +0100764 rxrpc_seq_t seq, int nr_acks,
765 struct rxrpc_ack_summary *summary)
David Howells248f2192016-09-08 11:10:12 +0100766{
David Howells248f2192016-09-08 11:10:12 +0100767 int ix;
David Howellsf07373e2016-09-22 00:29:32 +0100768 u8 annotation, anno_type;
David Howells248f2192016-09-08 11:10:12 +0100769
770 for (; nr_acks > 0; nr_acks--, seq++) {
771 ix = seq & RXRPC_RXTX_BUFF_MASK;
David Howellsf07373e2016-09-22 00:29:32 +0100772 annotation = call->rxtx_annotations[ix];
773 anno_type = annotation & RXRPC_TX_ANNO_MASK;
774 annotation &= ~RXRPC_TX_ANNO_MASK;
David Howellsd01dc4c2016-09-17 10:49:12 +0100775 switch (*acks++) {
David Howells248f2192016-09-08 11:10:12 +0100776 case RXRPC_ACK_TYPE_ACK:
David Howells31a1b9892016-09-24 18:05:26 +0100777 summary->nr_acks++;
David Howellsf07373e2016-09-22 00:29:32 +0100778 if (anno_type == RXRPC_TX_ANNO_ACK)
779 continue;
David Howells31a1b9892016-09-24 18:05:26 +0100780 summary->nr_new_acks++;
David Howellsf07373e2016-09-22 00:29:32 +0100781 call->rxtx_annotations[ix] =
782 RXRPC_TX_ANNO_ACK | annotation;
David Howells248f2192016-09-08 11:10:12 +0100783 break;
784 case RXRPC_ACK_TYPE_NACK:
David Howells31a1b9892016-09-24 18:05:26 +0100785 if (!summary->nr_nacks &&
786 call->acks_lowest_nak != seq) {
787 call->acks_lowest_nak = seq;
788 summary->new_low_nack = true;
789 }
790 summary->nr_nacks++;
David Howellsf07373e2016-09-22 00:29:32 +0100791 if (anno_type == RXRPC_TX_ANNO_NAK)
David Howells248f2192016-09-08 11:10:12 +0100792 continue;
David Howells31a1b9892016-09-24 18:05:26 +0100793 summary->nr_new_nacks++;
David Howellsbe8aa332016-09-23 12:39:23 +0100794 if (anno_type == RXRPC_TX_ANNO_RETRANS)
795 continue;
David Howellsf07373e2016-09-22 00:29:32 +0100796 call->rxtx_annotations[ix] =
797 RXRPC_TX_ANNO_NAK | annotation;
David Howells248f2192016-09-08 11:10:12 +0100798 break;
799 default:
800 return rxrpc_proto_abort("SFT", call, 0);
801 }
802 }
David Howells248f2192016-09-08 11:10:12 +0100803}
804
805/*
806 * Process an ACK packet.
807 *
808 * ack.firstPacket is the sequence number of the first soft-ACK'd/NAK'd packet
809 * in the ACK array. Anything before that is hard-ACK'd and may be discarded.
810 *
811 * A hard-ACK means that a packet has been processed and may be discarded; a
812 * soft-ACK means that the packet may be discarded and retransmission
813 * requested. A phase is complete when all packets are hard-ACK'd.
814 */
David Howellse8c3af62019-08-09 15:20:41 +0100815static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb)
David Howells248f2192016-09-08 11:10:12 +0100816{
David Howells31a1b9892016-09-24 18:05:26 +0100817 struct rxrpc_ack_summary summary = { 0 };
David Howells248f2192016-09-08 11:10:12 +0100818 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
819 union {
820 struct rxrpc_ackpacket ack;
821 struct rxrpc_ackinfo info;
822 u8 acks[RXRPC_MAXACKS];
823 } buf;
David Howells8e831342016-09-22 00:29:31 +0100824 rxrpc_serial_t acked_serial;
Jeffrey Altman1a2391c2019-04-12 16:34:16 +0100825 rxrpc_seq_t first_soft_ack, hard_ack, prev_pkt;
David Howells775e5b72016-09-30 13:26:03 +0100826 int nr_acks, offset, ioffset;
David Howells248f2192016-09-08 11:10:12 +0100827
828 _enter("");
829
David Howells775e5b72016-09-30 13:26:03 +0100830 offset = sizeof(struct rxrpc_wire_header);
831 if (skb_copy_bits(skb, offset, &buf.ack, sizeof(buf.ack)) < 0) {
David Howells248f2192016-09-08 11:10:12 +0100832 _debug("extraction failure");
833 return rxrpc_proto_abort("XAK", call, 0);
834 }
David Howells775e5b72016-09-30 13:26:03 +0100835 offset += sizeof(buf.ack);
David Howells248f2192016-09-08 11:10:12 +0100836
David Howells8e831342016-09-22 00:29:31 +0100837 acked_serial = ntohl(buf.ack.serial);
David Howells248f2192016-09-08 11:10:12 +0100838 first_soft_ack = ntohl(buf.ack.firstPacket);
Jeffrey Altman1a2391c2019-04-12 16:34:16 +0100839 prev_pkt = ntohl(buf.ack.previousPacket);
David Howells248f2192016-09-08 11:10:12 +0100840 hard_ack = first_soft_ack - 1;
841 nr_acks = buf.ack.nAcks;
David Howells31a1b9892016-09-24 18:05:26 +0100842 summary.ack_reason = (buf.ack.reason < RXRPC_ACK__INVALID ?
843 buf.ack.reason : RXRPC_ACK__INVALID);
David Howells248f2192016-09-08 11:10:12 +0100844
David Howellsb1d9f7fd2017-01-05 10:38:34 +0000845 trace_rxrpc_rx_ack(call, sp->hdr.serial, acked_serial,
Jeffrey Altman1a2391c2019-04-12 16:34:16 +0100846 first_soft_ack, prev_pkt,
David Howellsb1d9f7fd2017-01-05 10:38:34 +0000847 summary.ack_reason, nr_acks);
David Howellsec71eb92016-09-17 10:49:13 +0100848
David Howells8e831342016-09-22 00:29:31 +0100849 if (buf.ack.reason == RXRPC_ACK_PING_RESPONSE)
850 rxrpc_input_ping_response(call, skb->tstamp, acked_serial,
851 sp->hdr.serial);
David Howells50235c42016-09-22 00:29:31 +0100852 if (buf.ack.reason == RXRPC_ACK_REQUESTED)
853 rxrpc_input_requested_ack(call, skb->tstamp, acked_serial,
854 sp->hdr.serial);
David Howells8e831342016-09-22 00:29:31 +0100855
David Howells248f2192016-09-08 11:10:12 +0100856 if (buf.ack.reason == RXRPC_ACK_PING) {
857 _proto("Rx ACK %%%u PING Request", sp->hdr.serial);
858 rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE,
David Howellse8c3af62019-08-09 15:20:41 +0100859 sp->hdr.serial, true, true,
David Howells9c7ad432016-09-23 13:50:40 +0100860 rxrpc_propose_ack_respond_to_ping);
David Howells248f2192016-09-08 11:10:12 +0100861 } else if (sp->hdr.flags & RXRPC_REQUEST_ACK) {
862 rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED,
David Howellse8c3af62019-08-09 15:20:41 +0100863 sp->hdr.serial, true, true,
David Howells9c7ad432016-09-23 13:50:40 +0100864 rxrpc_propose_ack_respond_to_ack);
David Howells248f2192016-09-08 11:10:12 +0100865 }
866
Jeffrey Altman1a2391c2019-04-12 16:34:16 +0100867 /* Discard any out-of-order or duplicate ACKs (outside lock). */
868 if (before(first_soft_ack, call->ackr_first_seq) ||
869 before(prev_pkt, call->ackr_prev_seq))
David Howells298bc152018-10-08 15:46:11 +0100870 return;
David Howells248f2192016-09-08 11:10:12 +0100871
David Howellsc1e15b42018-10-08 15:46:25 +0100872 buf.info.rxMTU = 0;
873 ioffset = offset + nr_acks + 3;
874 if (skb->len >= ioffset + sizeof(buf.info) &&
875 skb_copy_bits(skb, ioffset, &buf.info, sizeof(buf.info)) < 0)
876 return rxrpc_proto_abort("XAI", call, 0);
877
878 spin_lock(&call->input_lock);
879
Jeffrey Altman1a2391c2019-04-12 16:34:16 +0100880 /* Discard any out-of-order or duplicate ACKs (inside lock). */
881 if (before(first_soft_ack, call->ackr_first_seq) ||
882 before(prev_pkt, call->ackr_prev_seq))
David Howellsc1e15b42018-10-08 15:46:25 +0100883 goto out;
David Howells298bc152018-10-08 15:46:11 +0100884 call->acks_latest_ts = skb->tstamp;
885 call->acks_latest = sp->hdr.serial;
886
Jeffrey Altman1a2391c2019-04-12 16:34:16 +0100887 call->ackr_first_seq = first_soft_ack;
888 call->ackr_prev_seq = prev_pkt;
889
David Howells298bc152018-10-08 15:46:11 +0100890 /* Parse rwind and mtu sizes if provided. */
David Howellsc1e15b42018-10-08 15:46:25 +0100891 if (buf.info.rxMTU)
David Howells248f2192016-09-08 11:10:12 +0100892 rxrpc_input_ackinfo(call, skb, &buf.info);
David Howells248f2192016-09-08 11:10:12 +0100893
David Howellsc1e15b42018-10-08 15:46:25 +0100894 if (first_soft_ack == 0) {
895 rxrpc_proto_abort("AK0", call, 0);
896 goto out;
897 }
David Howells248f2192016-09-08 11:10:12 +0100898
899 /* Ignore ACKs unless we are or have just been transmitting. */
David Howells146d8fe2017-03-04 00:01:41 +0000900 switch (READ_ONCE(call->state)) {
David Howells248f2192016-09-08 11:10:12 +0100901 case RXRPC_CALL_CLIENT_SEND_REQUEST:
902 case RXRPC_CALL_CLIENT_AWAIT_REPLY:
903 case RXRPC_CALL_SERVER_SEND_REPLY:
904 case RXRPC_CALL_SERVER_AWAIT_ACK:
905 break;
906 default:
David Howellsc1e15b42018-10-08 15:46:25 +0100907 goto out;
David Howells248f2192016-09-08 11:10:12 +0100908 }
909
David Howells248f2192016-09-08 11:10:12 +0100910 if (before(hard_ack, call->tx_hard_ack) ||
David Howellsc1e15b42018-10-08 15:46:25 +0100911 after(hard_ack, call->tx_top)) {
912 rxrpc_proto_abort("AKW", call, 0);
913 goto out;
914 }
915 if (nr_acks > call->tx_top - hard_ack) {
916 rxrpc_proto_abort("AKN", call, 0);
917 goto out;
David Howells70790dbe2016-09-23 12:39:22 +0100918 }
David Howells248f2192016-09-08 11:10:12 +0100919
David Howellsc479d5f2018-10-08 15:46:01 +0100920 if (after(hard_ack, call->tx_hard_ack)) {
921 if (rxrpc_rotate_tx_window(call, hard_ack, &summary)) {
922 rxrpc_end_tx_phase(call, false, "ETA");
David Howellsc1e15b42018-10-08 15:46:25 +0100923 goto out;
David Howellsc479d5f2018-10-08 15:46:01 +0100924 }
925 }
David Howells248f2192016-09-08 11:10:12 +0100926
927 if (nr_acks > 0) {
David Howellsc1e15b42018-10-08 15:46:25 +0100928 if (skb_copy_bits(skb, offset, buf.acks, nr_acks) < 0) {
929 rxrpc_proto_abort("XSA", call, 0);
930 goto out;
931 }
David Howells248f2192016-09-08 11:10:12 +0100932 rxrpc_input_soft_acks(call, buf.acks, first_soft_ack, nr_acks,
933 &summary);
David Howells70790dbe2016-09-23 12:39:22 +0100934 }
935
David Howells0d967962016-09-24 18:05:27 +0100936 if (call->rxtx_annotations[call->tx_top & RXRPC_RXTX_BUFF_MASK] &
937 RXRPC_TX_ANNO_LAST &&
David Howellsa9f312d2016-10-06 08:11:49 +0100938 summary.nr_acks == call->tx_top - hard_ack &&
939 rxrpc_is_client_call(call))
David Howellse8c3af62019-08-09 15:20:41 +0100940 rxrpc_propose_ACK(call, RXRPC_ACK_PING, sp->hdr.serial,
David Howells0d967962016-09-24 18:05:27 +0100941 false, true,
942 rxrpc_propose_ack_ping_for_lost_reply);
David Howells57494342016-09-24 18:05:27 +0100943
David Howellsc1e15b42018-10-08 15:46:25 +0100944 rxrpc_congestion_management(call, skb, &summary, acked_serial);
945out:
946 spin_unlock(&call->input_lock);
David Howells248f2192016-09-08 11:10:12 +0100947}
948
949/*
950 * Process an ACKALL packet.
951 */
952static void rxrpc_input_ackall(struct rxrpc_call *call, struct sk_buff *skb)
953{
David Howells31a1b9892016-09-24 18:05:26 +0100954 struct rxrpc_ack_summary summary = { 0 };
David Howells248f2192016-09-08 11:10:12 +0100955 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
956
957 _proto("Rx ACKALL %%%u", sp->hdr.serial);
958
David Howellsc1e15b42018-10-08 15:46:25 +0100959 spin_lock(&call->input_lock);
960
David Howellsc479d5f2018-10-08 15:46:01 +0100961 if (rxrpc_rotate_tx_window(call, call->tx_top, &summary))
David Howells70790dbe2016-09-23 12:39:22 +0100962 rxrpc_end_tx_phase(call, false, "ETL");
David Howellsc1e15b42018-10-08 15:46:25 +0100963
964 spin_unlock(&call->input_lock);
David Howells248f2192016-09-08 11:10:12 +0100965}
966
967/*
David Howells005ede22017-04-06 10:12:00 +0100968 * Process an ABORT packet directed at a call.
David Howells248f2192016-09-08 11:10:12 +0100969 */
970static void rxrpc_input_abort(struct rxrpc_call *call, struct sk_buff *skb)
David Howells17926a72007-04-26 15:48:28 -0700971{
972 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
David Howells0d12f8a2016-03-04 15:53:46 +0000973 __be32 wtmp;
David Howells248f2192016-09-08 11:10:12 +0100974 u32 abort_code = RX_CALL_DEAD;
975
976 _enter("");
977
978 if (skb->len >= 4 &&
David Howells775e5b72016-09-30 13:26:03 +0100979 skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
980 &wtmp, sizeof(wtmp)) >= 0)
David Howells248f2192016-09-08 11:10:12 +0100981 abort_code = ntohl(wtmp);
982
David Howells005ede22017-04-06 10:12:00 +0100983 trace_rxrpc_rx_abort(call, sp->hdr.serial, abort_code);
984
David Howells248f2192016-09-08 11:10:12 +0100985 _proto("Rx ABORT %%%u { %x }", sp->hdr.serial, abort_code);
986
987 if (rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED,
David Howells3a927892017-04-06 10:11:56 +0100988 abort_code, -ECONNABORTED))
David Howells248f2192016-09-08 11:10:12 +0100989 rxrpc_notify_socket(call);
990}
991
992/*
993 * Process an incoming call packet.
994 */
995static void rxrpc_input_call_packet(struct rxrpc_call *call,
David Howellse8c3af62019-08-09 15:20:41 +0100996 struct sk_buff *skb)
David Howells248f2192016-09-08 11:10:12 +0100997{
998 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
David Howellsa158bdd2017-11-24 10:18:41 +0000999 unsigned long timo;
David Howells17926a72007-04-26 15:48:28 -07001000
1001 _enter("%p,%p", call, skb);
1002
David Howellsa158bdd2017-11-24 10:18:41 +00001003 timo = READ_ONCE(call->next_rx_timo);
1004 if (timo) {
1005 unsigned long now = jiffies, expect_rx_by;
1006
David Howellsc54e43d2018-05-10 23:26:00 +01001007 expect_rx_by = now + timo;
David Howellsa158bdd2017-11-24 10:18:41 +00001008 WRITE_ONCE(call->expect_rx_by, expect_rx_by);
1009 rxrpc_reduce_call_timer(call, expect_rx_by, now,
1010 rxrpc_timer_set_for_normal);
1011 }
David Howells3d7682a2017-11-29 14:25:50 +00001012
David Howells17926a72007-04-26 15:48:28 -07001013 switch (sp->hdr.type) {
David Howells248f2192016-09-08 11:10:12 +01001014 case RXRPC_PACKET_TYPE_DATA:
David Howellse8c3af62019-08-09 15:20:41 +01001015 rxrpc_input_data(call, skb);
David Howells4858e402019-08-19 09:25:36 +01001016 goto no_free;
David Howells17926a72007-04-26 15:48:28 -07001017
David Howells248f2192016-09-08 11:10:12 +01001018 case RXRPC_PACKET_TYPE_ACK:
David Howellse8c3af62019-08-09 15:20:41 +01001019 rxrpc_input_ack(call, skb);
David Howells248f2192016-09-08 11:10:12 +01001020 break;
David Howells17926a72007-04-26 15:48:28 -07001021
1022 case RXRPC_PACKET_TYPE_BUSY:
David Howells0d12f8a2016-03-04 15:53:46 +00001023 _proto("Rx BUSY %%%u", sp->hdr.serial);
David Howells17926a72007-04-26 15:48:28 -07001024
David Howells248f2192016-09-08 11:10:12 +01001025 /* Just ignore BUSY packets from the server; the retry and
1026 * lifespan timers will take care of business. BUSY packets
1027 * from the client don't make sense.
1028 */
1029 break;
David Howells17926a72007-04-26 15:48:28 -07001030
David Howells248f2192016-09-08 11:10:12 +01001031 case RXRPC_PACKET_TYPE_ABORT:
1032 rxrpc_input_abort(call, skb);
1033 break;
1034
1035 case RXRPC_PACKET_TYPE_ACKALL:
1036 rxrpc_input_ackall(call, skb);
1037 break;
David Howells17926a72007-04-26 15:48:28 -07001038
1039 default:
David Howells17926a72007-04-26 15:48:28 -07001040 break;
1041 }
1042
David Howells987db9f2019-08-19 09:25:38 +01001043 rxrpc_free_skb(skb, rxrpc_skb_freed);
David Howells4858e402019-08-19 09:25:36 +01001044no_free:
David Howells17926a72007-04-26 15:48:28 -07001045 _leave("");
1046}
1047
1048/*
David Howellsc1e15b42018-10-08 15:46:25 +01001049 * Handle a new service call on a channel implicitly completing the preceding
1050 * call on that channel. This does not apply to client conns.
David Howellsb31562742016-10-06 08:11:49 +01001051 *
1052 * TODO: If callNumber > call_id + 1, renegotiate security.
1053 */
David Howellsc1e15b42018-10-08 15:46:25 +01001054static void rxrpc_input_implicit_end_call(struct rxrpc_sock *rx,
1055 struct rxrpc_connection *conn,
David Howellsb31562742016-10-06 08:11:49 +01001056 struct rxrpc_call *call)
1057{
David Howells146d8fe2017-03-04 00:01:41 +00001058 switch (READ_ONCE(call->state)) {
David Howellsb31562742016-10-06 08:11:49 +01001059 case RXRPC_CALL_SERVER_AWAIT_ACK:
1060 rxrpc_call_completed(call);
David Howellsc1e15b42018-10-08 15:46:25 +01001061 /* Fall through */
David Howellsb31562742016-10-06 08:11:49 +01001062 case RXRPC_CALL_COMPLETE:
1063 break;
1064 default:
David Howells3a927892017-04-06 10:11:56 +01001065 if (rxrpc_abort_call("IMP", call, 0, RX_CALL_DEAD, -ESHUTDOWN)) {
David Howellsb31562742016-10-06 08:11:49 +01001066 set_bit(RXRPC_CALL_EV_ABORT, &call->events);
1067 rxrpc_queue_call(call);
1068 }
David Howellsc1e15b42018-10-08 15:46:25 +01001069 trace_rxrpc_improper_term(call);
David Howellsb31562742016-10-06 08:11:49 +01001070 break;
1071 }
1072
David Howellsc1e15b42018-10-08 15:46:25 +01001073 spin_lock(&rx->incoming_lock);
David Howellsb31562742016-10-06 08:11:49 +01001074 __rxrpc_disconnect_call(conn, call);
David Howellsc1e15b42018-10-08 15:46:25 +01001075 spin_unlock(&rx->incoming_lock);
David Howellsb31562742016-10-06 08:11:49 +01001076 rxrpc_notify_socket(call);
1077}
1078
1079/*
David Howells17926a72007-04-26 15:48:28 -07001080 * post connection-level events to the connection
David Howells18bfeba2016-08-23 15:27:25 +01001081 * - this includes challenges, responses, some aborts and call terminal packet
1082 * retransmission.
David Howells17926a72007-04-26 15:48:28 -07001083 */
David Howells2e7e9752016-08-09 10:11:48 +01001084static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn,
David Howells17926a72007-04-26 15:48:28 -07001085 struct sk_buff *skb)
1086{
1087 _enter("%p,%p", conn, skb);
1088
David Howells17926a72007-04-26 15:48:28 -07001089 skb_queue_tail(&conn->rx_queue, skb);
David Howells2e7e9752016-08-09 10:11:48 +01001090 rxrpc_queue_conn(conn);
David Howells17926a72007-04-26 15:48:28 -07001091}
1092
David Howells44ba0692015-04-01 16:31:26 +01001093/*
1094 * post endpoint-level events to the local endpoint
1095 * - this includes debug and version messages
1096 */
1097static void rxrpc_post_packet_to_local(struct rxrpc_local *local,
1098 struct sk_buff *skb)
1099{
1100 _enter("%p,%p", local, skb);
1101
David Howells730c5fd2019-08-09 15:20:41 +01001102 if (rxrpc_get_local_maybe(local)) {
1103 skb_queue_tail(&local->event_queue, skb);
1104 rxrpc_queue_local(local);
1105 } else {
David Howells987db9f2019-08-19 09:25:38 +01001106 rxrpc_free_skb(skb, rxrpc_skb_freed);
David Howells730c5fd2019-08-09 15:20:41 +01001107 }
David Howells44ba0692015-04-01 16:31:26 +01001108}
1109
David Howells0d12f8a2016-03-04 15:53:46 +00001110/*
David Howells248f2192016-09-08 11:10:12 +01001111 * put a packet up for transport-level abort
1112 */
1113static void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb)
1114{
1115 CHECK_SLAB_OKAY(&local->usage);
1116
David Howells730c5fd2019-08-09 15:20:41 +01001117 if (rxrpc_get_local_maybe(local)) {
1118 skb_queue_tail(&local->reject_queue, skb);
1119 rxrpc_queue_local(local);
1120 } else {
David Howells987db9f2019-08-19 09:25:38 +01001121 rxrpc_free_skb(skb, rxrpc_skb_freed);
David Howells730c5fd2019-08-09 15:20:41 +01001122 }
David Howells248f2192016-09-08 11:10:12 +01001123}
1124
1125/*
David Howells0d12f8a2016-03-04 15:53:46 +00001126 * Extract the wire header from a packet and translate the byte order.
1127 */
1128static noinline
1129int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb)
1130{
1131 struct rxrpc_wire_header whdr;
1132
1133 /* dig out the RxRPC connection details */
David Howellsfb46f6e2017-04-06 10:12:00 +01001134 if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0) {
1135 trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
1136 tracepoint_string("bad_hdr"));
David Howells0d12f8a2016-03-04 15:53:46 +00001137 return -EBADMSG;
David Howellsfb46f6e2017-04-06 10:12:00 +01001138 }
David Howells0d12f8a2016-03-04 15:53:46 +00001139
1140 memset(sp, 0, sizeof(*sp));
1141 sp->hdr.epoch = ntohl(whdr.epoch);
1142 sp->hdr.cid = ntohl(whdr.cid);
1143 sp->hdr.callNumber = ntohl(whdr.callNumber);
1144 sp->hdr.seq = ntohl(whdr.seq);
1145 sp->hdr.serial = ntohl(whdr.serial);
1146 sp->hdr.flags = whdr.flags;
1147 sp->hdr.type = whdr.type;
1148 sp->hdr.userStatus = whdr.userStatus;
1149 sp->hdr.securityIndex = whdr.securityIndex;
1150 sp->hdr._rsvd = ntohs(whdr._rsvd);
1151 sp->hdr.serviceId = ntohs(whdr.serviceId);
1152 return 0;
1153}
1154
David Howells17926a72007-04-26 15:48:28 -07001155/*
1156 * handle data received on the local endpoint
1157 * - may be called in interrupt context
David Howells4f95dd72016-04-04 14:00:35 +01001158 *
Eric Dumazet032be5f2019-04-24 09:44:11 -07001159 * [!] Note that as this is called from the encap_rcv hook, the socket is not
1160 * held locked by the caller and nothing prevents sk_user_data on the UDP from
1161 * being cleared in the middle of processing this function.
David Howellsbfd28212018-10-08 15:45:56 +01001162 *
1163 * Called with the RCU read lock held from the IP layer via UDP.
David Howells17926a72007-04-26 15:48:28 -07001164 */
David Howells52719532018-10-04 11:10:51 +01001165int rxrpc_input_packet(struct sock *udp_sk, struct sk_buff *skb)
David Howells17926a72007-04-26 15:48:28 -07001166{
Eric Dumazet032be5f2019-04-24 09:44:11 -07001167 struct rxrpc_local *local = rcu_dereference_sk_user_data(udp_sk);
David Howells8496af52016-07-01 07:51:50 +01001168 struct rxrpc_connection *conn;
David Howells248f2192016-09-08 11:10:12 +01001169 struct rxrpc_channel *chan;
David Howells403fc2a2018-09-27 15:13:08 +01001170 struct rxrpc_call *call = NULL;
David Howells17926a72007-04-26 15:48:28 -07001171 struct rxrpc_skb_priv *sp;
David Howells0099dc52018-09-27 15:13:09 +01001172 struct rxrpc_peer *peer = NULL;
1173 struct rxrpc_sock *rx = NULL;
David Howells248f2192016-09-08 11:10:12 +01001174 unsigned int channel;
David Howells17926a72007-04-26 15:48:28 -07001175
David Howells248f2192016-09-08 11:10:12 +01001176 _enter("%p", udp_sk);
David Howells17926a72007-04-26 15:48:28 -07001177
Eric Dumazet032be5f2019-04-24 09:44:11 -07001178 if (unlikely(!local)) {
1179 kfree_skb(skb);
1180 return 0;
1181 }
David Howellsb604dd92018-09-27 15:13:08 +01001182 if (skb->tstamp == 0)
1183 skb->tstamp = ktime_get_real();
1184
David Howells987db9f2019-08-19 09:25:38 +01001185 rxrpc_new_skb(skb, rxrpc_skb_received);
David Howells17926a72007-04-26 15:48:28 -07001186
David Howells52719532018-10-04 11:10:51 +01001187 skb_pull(skb, sizeof(struct udphdr));
Herbert Xu1781f7f2007-12-11 11:30:32 -08001188
Paolo Abeni7c13f972016-11-04 11:28:59 +01001189 /* The UDP protocol already released all skb resources;
1190 * we are free to add our own data there.
David Howells0d12f8a2016-03-04 15:53:46 +00001191 */
David Howells17926a72007-04-26 15:48:28 -07001192 sp = rxrpc_skb(skb);
David Howells17926a72007-04-26 15:48:28 -07001193
David Howells89b475a2016-09-23 12:39:22 +01001194 /* dig out the RxRPC connection details */
1195 if (rxrpc_extract_header(sp, skb) < 0)
1196 goto bad_message;
1197
David Howells8a681c362016-09-17 10:49:15 +01001198 if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {
1199 static int lose;
1200 if ((lose++ & 7) == 7) {
David Howells89b475a2016-09-23 12:39:22 +01001201 trace_rxrpc_rx_lose(sp);
David Howells987db9f2019-08-19 09:25:38 +01001202 rxrpc_free_skb(skb, rxrpc_skb_lost);
David Howells52719532018-10-04 11:10:51 +01001203 return 0;
David Howells8a681c362016-09-17 10:49:15 +01001204 }
1205 }
1206
David Howells2cfa2272018-10-05 14:05:35 +01001207 if (skb->tstamp == 0)
1208 skb->tstamp = ktime_get_real();
David Howells49e19ec2016-09-08 11:10:12 +01001209 trace_rxrpc_rx_packet(sp);
David Howells17926a72007-04-26 15:48:28 -07001210
David Howells248f2192016-09-08 11:10:12 +01001211 switch (sp->hdr.type) {
1212 case RXRPC_PACKET_TYPE_VERSION:
David Howellsdc71db32018-09-27 15:13:08 +01001213 if (rxrpc_to_client(sp))
David Howellsace45be2018-03-30 21:04:43 +01001214 goto discard;
David Howells44ba0692015-04-01 16:31:26 +01001215 rxrpc_post_packet_to_local(local, skb);
1216 goto out;
David Howellsbc6e1ea2016-06-10 22:30:27 +01001217
David Howells248f2192016-09-08 11:10:12 +01001218 case RXRPC_PACKET_TYPE_BUSY:
David Howellsdc71db32018-09-27 15:13:08 +01001219 if (rxrpc_to_server(sp))
David Howells248f2192016-09-08 11:10:12 +01001220 goto discard;
Gustavo A. R. Silvae3cf39702017-10-19 16:54:48 -05001221 /* Fall through */
David Howells403fc2a2018-09-27 15:13:08 +01001222 case RXRPC_PACKET_TYPE_ACK:
1223 case RXRPC_PACKET_TYPE_ACKALL:
1224 if (sp->hdr.callNumber == 0)
1225 goto bad_message;
1226 /* Fall through */
1227 case RXRPC_PACKET_TYPE_ABORT:
1228 break;
David Howells248f2192016-09-08 11:10:12 +01001229
1230 case RXRPC_PACKET_TYPE_DATA:
David Howells403fc2a2018-09-27 15:13:08 +01001231 if (sp->hdr.callNumber == 0 ||
1232 sp->hdr.seq == 0)
David Howells248f2192016-09-08 11:10:12 +01001233 goto bad_message;
David Howellsc3c9e3d2019-08-19 09:25:37 +01001234 if (!rxrpc_validate_data(skb))
David Howells248f2192016-09-08 11:10:12 +01001235 goto bad_message;
David Howellsd0d5c0c2019-08-27 10:13:46 +01001236
1237 /* Unshare the packet so that it can be modified for in-place
1238 * decryption.
1239 */
1240 if (sp->hdr.securityIndex != 0) {
1241 struct sk_buff *nskb = skb_unshare(skb, GFP_ATOMIC);
1242 if (!nskb) {
1243 rxrpc_eaten_skb(skb, rxrpc_skb_unshared_nomem);
1244 goto out;
1245 }
1246
1247 if (nskb != skb) {
1248 rxrpc_eaten_skb(skb, rxrpc_skb_received);
David Howellsd0d5c0c2019-08-27 10:13:46 +01001249 skb = nskb;
David Howells59132892019-09-02 11:34:08 +01001250 rxrpc_new_skb(skb, rxrpc_skb_unshared);
David Howellsd0d5c0c2019-08-27 10:13:46 +01001251 sp = rxrpc_skb(skb);
1252 }
1253 }
David Howells248f2192016-09-08 11:10:12 +01001254 break;
David Howellsb41d7cf2018-04-02 23:51:39 +01001255
David Howells403fc2a2018-09-27 15:13:08 +01001256 case RXRPC_PACKET_TYPE_CHALLENGE:
1257 if (rxrpc_to_server(sp))
1258 goto discard;
1259 break;
1260 case RXRPC_PACKET_TYPE_RESPONSE:
1261 if (rxrpc_to_client(sp))
1262 goto discard;
1263 break;
1264
David Howellsb41d7cf2018-04-02 23:51:39 +01001265 /* Packet types 9-11 should just be ignored. */
1266 case RXRPC_PACKET_TYPE_PARAMS:
1267 case RXRPC_PACKET_TYPE_10:
1268 case RXRPC_PACKET_TYPE_11:
1269 goto discard;
David Howells403fc2a2018-09-27 15:13:08 +01001270
1271 default:
1272 _proto("Rx Bad Packet Type %u", sp->hdr.type);
1273 goto bad_message;
David Howells248f2192016-09-08 11:10:12 +01001274 }
David Howells17926a72007-04-26 15:48:28 -07001275
David Howells403fc2a2018-09-27 15:13:08 +01001276 if (sp->hdr.serviceId == 0)
1277 goto bad_message;
1278
David Howells403fc2a2018-09-27 15:13:08 +01001279 if (rxrpc_to_server(sp)) {
1280 /* Weed out packets to services we're not offering. Packets
1281 * that would begin a call are explicitly rejected and the rest
1282 * are just discarded.
1283 */
1284 rx = rcu_dereference(local->service);
1285 if (!rx || (sp->hdr.serviceId != rx->srx.srx_service &&
1286 sp->hdr.serviceId != rx->second_service)) {
1287 if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
1288 sp->hdr.seq == 1)
1289 goto unsupported_service;
David Howellsbfd28212018-10-08 15:45:56 +01001290 goto discard;
David Howells403fc2a2018-09-27 15:13:08 +01001291 }
1292 }
1293
David Howells0099dc52018-09-27 15:13:09 +01001294 conn = rxrpc_find_connection_rcu(local, skb, &peer);
David Howells248f2192016-09-08 11:10:12 +01001295 if (conn) {
1296 if (sp->hdr.securityIndex != conn->security_ix)
1297 goto wrong_security;
David Howells563ea7d2016-08-23 15:27:25 +01001298
David Howells4e255722017-06-05 14:30:49 +01001299 if (sp->hdr.serviceId != conn->service_id) {
David Howellsc1e15b42018-10-08 15:46:25 +01001300 int old_id;
1301
1302 if (!test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags))
David Howells4e255722017-06-05 14:30:49 +01001303 goto reupgrade;
David Howellsc1e15b42018-10-08 15:46:25 +01001304 old_id = cmpxchg(&conn->service_id, conn->params.service_id,
1305 sp->hdr.serviceId);
1306
1307 if (old_id != conn->params.service_id &&
1308 old_id != sp->hdr.serviceId)
1309 goto reupgrade;
David Howells4e255722017-06-05 14:30:49 +01001310 }
David Howells3d7682a2017-11-29 14:25:50 +00001311
David Howells248f2192016-09-08 11:10:12 +01001312 if (sp->hdr.callNumber == 0) {
1313 /* Connection-level packet */
1314 _debug("CONN %p {%d}", conn, conn->debug_id);
1315 rxrpc_post_packet_to_conn(conn, skb);
David Howellsbfd28212018-10-08 15:45:56 +01001316 goto out;
David Howells248f2192016-09-08 11:10:12 +01001317 }
David Howells8496af52016-07-01 07:51:50 +01001318
David Howellse8c3af62019-08-09 15:20:41 +01001319 if ((int)sp->hdr.serial - (int)conn->hi_serial > 0)
1320 conn->hi_serial = sp->hdr.serial;
David Howells248f2192016-09-08 11:10:12 +01001321
David Howells8496af52016-07-01 07:51:50 +01001322 /* Call-bound packets are routed by connection channel. */
David Howells248f2192016-09-08 11:10:12 +01001323 channel = sp->hdr.cid & RXRPC_CHANNELMASK;
1324 chan = &conn->channels[channel];
Tim Smith77276402014-03-03 23:04:45 +00001325
David Howells18bfeba2016-08-23 15:27:25 +01001326 /* Ignore really old calls */
1327 if (sp->hdr.callNumber < chan->last_call)
David Howellsbfd28212018-10-08 15:45:56 +01001328 goto discard;
David Howells18bfeba2016-08-23 15:27:25 +01001329
1330 if (sp->hdr.callNumber == chan->last_call) {
David Howells57b0c9d2018-03-30 21:04:44 +01001331 if (chan->call ||
1332 sp->hdr.type == RXRPC_PACKET_TYPE_ABORT)
David Howellsbfd28212018-10-08 15:45:56 +01001333 goto discard;
David Howells18bfeba2016-08-23 15:27:25 +01001334
David Howells57b0c9d2018-03-30 21:04:44 +01001335 /* For the previous service call, if completed
1336 * successfully, we discard all further packets.
1337 */
1338 if (rxrpc_conn_is_service(conn) &&
1339 chan->last_type == RXRPC_PACKET_TYPE_ACK)
David Howellsbfd28212018-10-08 15:45:56 +01001340 goto discard;
David Howells57b0c9d2018-03-30 21:04:44 +01001341
1342 /* But otherwise we need to retransmit the final packet
1343 * from data cached in the connection record.
David Howells18bfeba2016-08-23 15:27:25 +01001344 */
David Howells4764c0d2018-07-23 17:18:37 +01001345 if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA)
1346 trace_rxrpc_rx_data(chan->call_debug_id,
1347 sp->hdr.seq,
1348 sp->hdr.serial,
1349 sp->hdr.flags, 0);
David Howells18bfeba2016-08-23 15:27:25 +01001350 rxrpc_post_packet_to_conn(conn, skb);
David Howellsbfd28212018-10-08 15:45:56 +01001351 goto out;
David Howells18bfeba2016-08-23 15:27:25 +01001352 }
1353
1354 call = rcu_dereference(chan->call);
David Howellsb31562742016-10-06 08:11:49 +01001355
1356 if (sp->hdr.callNumber > chan->call_id) {
David Howellsbfd28212018-10-08 15:45:56 +01001357 if (rxrpc_to_client(sp))
David Howellsb31562742016-10-06 08:11:49 +01001358 goto reject_packet;
David Howellsb31562742016-10-06 08:11:49 +01001359 if (call)
David Howellsc1e15b42018-10-08 15:46:25 +01001360 rxrpc_input_implicit_end_call(rx, conn, call);
David Howellsb31562742016-10-06 08:11:49 +01001361 call = NULL;
1362 }
David Howells4e255722017-06-05 14:30:49 +01001363
David Howells1a025022018-06-03 02:17:39 +01001364 if (call) {
1365 if (sp->hdr.serviceId != call->service_id)
1366 call->service_id = sp->hdr.serviceId;
1367 if ((int)sp->hdr.serial - (int)call->rx_serial > 0)
1368 call->rx_serial = sp->hdr.serial;
1369 if (!test_bit(RXRPC_CALL_RX_HEARD, &call->flags))
1370 set_bit(RXRPC_CALL_RX_HEARD, &call->flags);
1371 }
Tim Smith77276402014-03-03 23:04:45 +00001372 }
David Howells44ba0692015-04-01 16:31:26 +01001373
David Howells248f2192016-09-08 11:10:12 +01001374 if (!call || atomic_read(&call->usage) == 0) {
David Howellsdc71db32018-09-27 15:13:08 +01001375 if (rxrpc_to_client(sp) ||
David Howells248f2192016-09-08 11:10:12 +01001376 sp->hdr.type != RXRPC_PACKET_TYPE_DATA)
David Howellsbfd28212018-10-08 15:45:56 +01001377 goto bad_message;
David Howells248f2192016-09-08 11:10:12 +01001378 if (sp->hdr.seq != 1)
David Howellsbfd28212018-10-08 15:45:56 +01001379 goto discard;
David Howellsc1e15b42018-10-08 15:46:25 +01001380 call = rxrpc_new_incoming_call(local, rx, skb);
David Howellsbfd28212018-10-08 15:45:56 +01001381 if (!call)
David Howells248f2192016-09-08 11:10:12 +01001382 goto reject_packet;
David Howells248f2192016-09-08 11:10:12 +01001383 }
1384
David Howells4858e402019-08-19 09:25:36 +01001385 /* Process a call packet; this either discards or passes on the ref
1386 * elsewhere.
1387 */
David Howellse8c3af62019-08-09 15:20:41 +01001388 rxrpc_input_call_packet(call, skb);
David Howells4858e402019-08-19 09:25:36 +01001389 goto out;
David Howells248f2192016-09-08 11:10:12 +01001390
David Howells248f2192016-09-08 11:10:12 +01001391discard:
David Howells987db9f2019-08-19 09:25:38 +01001392 rxrpc_free_skb(skb, rxrpc_skb_freed);
David Howells44ba0692015-04-01 16:31:26 +01001393out:
David Howells49e19ec2016-09-08 11:10:12 +01001394 trace_rxrpc_rx_done(0, 0);
David Howells52719532018-10-04 11:10:51 +01001395 return 0;
David Howells8496af52016-07-01 07:51:50 +01001396
David Howells248f2192016-09-08 11:10:12 +01001397wrong_security:
David Howellsa25e21f2018-03-27 23:03:00 +01001398 trace_rxrpc_abort(0, "SEC", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
David Howells248f2192016-09-08 11:10:12 +01001399 RXKADINCONSISTENCY, EBADMSG);
1400 skb->priority = RXKADINCONSISTENCY;
1401 goto post_abort;
David Howells17926a72007-04-26 15:48:28 -07001402
David Howells403fc2a2018-09-27 15:13:08 +01001403unsupported_service:
David Howells403fc2a2018-09-27 15:13:08 +01001404 trace_rxrpc_abort(0, "INV", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
1405 RX_INVALID_OPERATION, EOPNOTSUPP);
1406 skb->priority = RX_INVALID_OPERATION;
1407 goto post_abort;
1408
David Howells4e255722017-06-05 14:30:49 +01001409reupgrade:
David Howellsa25e21f2018-03-27 23:03:00 +01001410 trace_rxrpc_abort(0, "UPG", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
David Howells4e255722017-06-05 14:30:49 +01001411 RX_PROTOCOL_ERROR, EBADMSG);
1412 goto protocol_error;
1413
David Howells17926a72007-04-26 15:48:28 -07001414bad_message:
David Howellsa25e21f2018-03-27 23:03:00 +01001415 trace_rxrpc_abort(0, "BAD", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
David Howells248f2192016-09-08 11:10:12 +01001416 RX_PROTOCOL_ERROR, EBADMSG);
David Howells4e255722017-06-05 14:30:49 +01001417protocol_error:
David Howells17926a72007-04-26 15:48:28 -07001418 skb->priority = RX_PROTOCOL_ERROR;
David Howells248f2192016-09-08 11:10:12 +01001419post_abort:
David Howellsece64fe2018-09-27 15:13:08 +01001420 skb->mark = RXRPC_SKB_MARK_REJECT_ABORT;
David Howells49e19ec2016-09-08 11:10:12 +01001421reject_packet:
1422 trace_rxrpc_rx_done(skb->mark, skb->priority);
David Howells17926a72007-04-26 15:48:28 -07001423 rxrpc_reject_packet(local, skb);
David Howells17926a72007-04-26 15:48:28 -07001424 _leave(" [badmsg]");
David Howells52719532018-10-04 11:10:51 +01001425 return 0;
David Howells17926a72007-04-26 15:48:28 -07001426}