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Commit | Line | Data |
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17926a79 DH |
1 | /* RxRPC packet reception |
2 | * | |
248f219c | 3 | * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved. |
17926a79 DH |
4 | * Written by David Howells (dhowells@redhat.com) |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
9b6d5398 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
17926a79 DH |
14 | #include <linux/module.h> |
15 | #include <linux/net.h> | |
16 | #include <linux/skbuff.h> | |
17 | #include <linux/errqueue.h> | |
18 | #include <linux/udp.h> | |
19 | #include <linux/in.h> | |
20 | #include <linux/in6.h> | |
21 | #include <linux/icmp.h> | |
5a0e3ad6 | 22 | #include <linux/gfp.h> |
17926a79 DH |
23 | #include <net/sock.h> |
24 | #include <net/af_rxrpc.h> | |
25 | #include <net/ip.h> | |
1781f7f5 | 26 | #include <net/udp.h> |
0283328e | 27 | #include <net/net_namespace.h> |
17926a79 DH |
28 | #include "ar-internal.h" |
29 | ||
248f219c DH |
30 | static void rxrpc_proto_abort(const char *why, |
31 | struct rxrpc_call *call, rxrpc_seq_t seq) | |
32 | { | |
33 | if (rxrpc_abort_call(why, call, seq, RX_PROTOCOL_ERROR, EBADMSG)) { | |
34 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); | |
35 | rxrpc_queue_call(call); | |
36 | } | |
37 | } | |
38 | ||
17926a79 | 39 | /* |
248f219c | 40 | * Apply a hard ACK by advancing the Tx window. |
17926a79 | 41 | */ |
248f219c | 42 | static void rxrpc_rotate_tx_window(struct rxrpc_call *call, rxrpc_seq_t to) |
17926a79 | 43 | { |
248f219c DH |
44 | struct sk_buff *skb, *list = NULL; |
45 | int ix; | |
17926a79 | 46 | |
248f219c | 47 | spin_lock(&call->lock); |
17926a79 | 48 | |
248f219c DH |
49 | while (before(call->tx_hard_ack, to)) { |
50 | call->tx_hard_ack++; | |
51 | ix = call->tx_hard_ack & RXRPC_RXTX_BUFF_MASK; | |
52 | skb = call->rxtx_buffer[ix]; | |
71f3ca40 | 53 | rxrpc_see_skb(skb, rxrpc_skb_tx_rotated); |
248f219c DH |
54 | call->rxtx_buffer[ix] = NULL; |
55 | call->rxtx_annotations[ix] = 0; | |
56 | skb->next = list; | |
57 | list = skb; | |
58 | } | |
17926a79 | 59 | |
248f219c | 60 | spin_unlock(&call->lock); |
17926a79 | 61 | |
a124fe3e | 62 | trace_rxrpc_transmit(call, rxrpc_transmit_rotate); |
bc4abfcf DH |
63 | wake_up(&call->waitq); |
64 | ||
248f219c DH |
65 | while (list) { |
66 | skb = list; | |
67 | list = skb->next; | |
68 | skb->next = NULL; | |
71f3ca40 | 69 | rxrpc_free_skb(skb, rxrpc_skb_tx_freed); |
17926a79 | 70 | } |
248f219c | 71 | } |
17926a79 | 72 | |
248f219c DH |
73 | /* |
74 | * End the transmission phase of a call. | |
75 | * | |
76 | * This occurs when we get an ACKALL packet, the first DATA packet of a reply, | |
77 | * or a final ACK packet. | |
78 | */ | |
79 | static bool rxrpc_end_tx_phase(struct rxrpc_call *call, const char *abort_why) | |
80 | { | |
81 | _enter(""); | |
17926a79 | 82 | |
248f219c DH |
83 | switch (call->state) { |
84 | case RXRPC_CALL_CLIENT_RECV_REPLY: | |
85 | return true; | |
86 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
87 | case RXRPC_CALL_SERVER_AWAIT_ACK: | |
88 | break; | |
89 | default: | |
90 | rxrpc_proto_abort(abort_why, call, call->tx_top); | |
91 | return false; | |
17926a79 DH |
92 | } |
93 | ||
248f219c | 94 | rxrpc_rotate_tx_window(call, call->tx_top); |
17926a79 | 95 | |
248f219c | 96 | write_lock(&call->state_lock); |
651350d1 | 97 | |
248f219c DH |
98 | switch (call->state) { |
99 | default: | |
100 | break; | |
101 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
71f3ca40 | 102 | call->tx_phase = false; |
248f219c DH |
103 | call->state = RXRPC_CALL_CLIENT_RECV_REPLY; |
104 | break; | |
105 | case RXRPC_CALL_SERVER_AWAIT_ACK: | |
106 | __rxrpc_call_completed(call); | |
107 | rxrpc_notify_socket(call); | |
108 | break; | |
17926a79 | 109 | } |
17926a79 | 110 | |
248f219c | 111 | write_unlock(&call->state_lock); |
a124fe3e | 112 | trace_rxrpc_transmit(call, rxrpc_transmit_end); |
248f219c DH |
113 | _leave(" = ok"); |
114 | return true; | |
115 | } | |
116 | ||
117 | /* | |
118 | * Scan a jumbo packet to validate its structure and to work out how many | |
119 | * subpackets it contains. | |
120 | * | |
121 | * A jumbo packet is a collection of consecutive packets glued together with | |
122 | * little headers between that indicate how to change the initial header for | |
123 | * each subpacket. | |
124 | * | |
125 | * RXRPC_JUMBO_PACKET must be set on all but the last subpacket - and all but | |
126 | * the last are RXRPC_JUMBO_DATALEN in size. The last subpacket may be of any | |
127 | * size. | |
128 | */ | |
129 | static bool rxrpc_validate_jumbo(struct sk_buff *skb) | |
130 | { | |
131 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
132 | unsigned int offset = sp->offset; | |
89a80ed4 | 133 | unsigned int len = skb->len; |
248f219c DH |
134 | int nr_jumbo = 1; |
135 | u8 flags = sp->hdr.flags; | |
136 | ||
137 | do { | |
138 | nr_jumbo++; | |
139 | if (len - offset < RXRPC_JUMBO_SUBPKTLEN) | |
140 | goto protocol_error; | |
141 | if (flags & RXRPC_LAST_PACKET) | |
142 | goto protocol_error; | |
143 | offset += RXRPC_JUMBO_DATALEN; | |
144 | if (skb_copy_bits(skb, offset, &flags, 1) < 0) | |
145 | goto protocol_error; | |
146 | offset += sizeof(struct rxrpc_jumbo_header); | |
147 | } while (flags & RXRPC_JUMBO_PACKET); | |
148 | ||
149 | sp->nr_jumbo = nr_jumbo; | |
150 | return true; | |
17926a79 | 151 | |
248f219c DH |
152 | protocol_error: |
153 | return false; | |
17926a79 DH |
154 | } |
155 | ||
156 | /* | |
248f219c DH |
157 | * Handle reception of a duplicate packet. |
158 | * | |
159 | * We have to take care to avoid an attack here whereby we're given a series of | |
160 | * jumbograms, each with a sequence number one before the preceding one and | |
161 | * filled up to maximum UDP size. If they never send us the first packet in | |
162 | * the sequence, they can cause us to have to hold on to around 2MiB of kernel | |
163 | * space until the call times out. | |
164 | * | |
165 | * We limit the space usage by only accepting three duplicate jumbo packets per | |
166 | * call. After that, we tell the other side we're no longer accepting jumbos | |
167 | * (that information is encoded in the ACK packet). | |
17926a79 | 168 | */ |
248f219c | 169 | static void rxrpc_input_dup_data(struct rxrpc_call *call, rxrpc_seq_t seq, |
75e42126 | 170 | u8 annotation, bool *_jumbo_bad) |
17926a79 | 171 | { |
248f219c DH |
172 | /* Discard normal packets that are duplicates. */ |
173 | if (annotation == 0) | |
174 | return; | |
17926a79 | 175 | |
248f219c DH |
176 | /* Skip jumbo subpackets that are duplicates. When we've had three or |
177 | * more partially duplicate jumbo packets, we refuse to take any more | |
178 | * jumbos for this call. | |
179 | */ | |
75e42126 DH |
180 | if (!*_jumbo_bad) { |
181 | call->nr_jumbo_bad++; | |
182 | *_jumbo_bad = true; | |
248f219c DH |
183 | } |
184 | } | |
17926a79 | 185 | |
248f219c DH |
186 | /* |
187 | * Process a DATA packet, adding the packet to the Rx ring. | |
188 | */ | |
189 | static void rxrpc_input_data(struct rxrpc_call *call, struct sk_buff *skb, | |
190 | u16 skew) | |
191 | { | |
192 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
193 | unsigned int offset = sp->offset; | |
194 | unsigned int ix; | |
195 | rxrpc_serial_t serial = sp->hdr.serial, ack_serial = 0; | |
196 | rxrpc_seq_t seq = sp->hdr.seq, hard_ack; | |
75e42126 | 197 | bool immediate_ack = false, jumbo_bad = false, queued; |
248f219c DH |
198 | u16 len; |
199 | u8 ack = 0, flags, annotation = 0; | |
17926a79 | 200 | |
248f219c | 201 | _enter("{%u,%u},{%u,%u}", |
89a80ed4 | 202 | call->rx_hard_ack, call->rx_top, skb->len, seq); |
17926a79 | 203 | |
248f219c DH |
204 | _proto("Rx DATA %%%u { #%u f=%02x }", |
205 | sp->hdr.serial, seq, sp->hdr.flags); | |
17926a79 | 206 | |
248f219c DH |
207 | if (call->state >= RXRPC_CALL_COMPLETE) |
208 | return; | |
17926a79 | 209 | |
248f219c DH |
210 | /* Received data implicitly ACKs all of the request packets we sent |
211 | * when we're acting as a client. | |
212 | */ | |
213 | if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY && | |
214 | !rxrpc_end_tx_phase(call, "ETD")) | |
215 | return; | |
17926a79 | 216 | |
248f219c | 217 | call->ackr_prev_seq = seq; |
17926a79 | 218 | |
248f219c DH |
219 | hard_ack = READ_ONCE(call->rx_hard_ack); |
220 | if (after(seq, hard_ack + call->rx_winsize)) { | |
17926a79 | 221 | ack = RXRPC_ACK_EXCEEDS_WINDOW; |
248f219c DH |
222 | ack_serial = serial; |
223 | goto ack; | |
17926a79 DH |
224 | } |
225 | ||
248f219c DH |
226 | flags = sp->hdr.flags; |
227 | if (flags & RXRPC_JUMBO_PACKET) { | |
75e42126 | 228 | if (call->nr_jumbo_bad > 3) { |
248f219c DH |
229 | ack = RXRPC_ACK_NOSPACE; |
230 | ack_serial = serial; | |
231 | goto ack; | |
17926a79 | 232 | } |
248f219c | 233 | annotation = 1; |
17926a79 DH |
234 | } |
235 | ||
248f219c DH |
236 | next_subpacket: |
237 | queued = false; | |
238 | ix = seq & RXRPC_RXTX_BUFF_MASK; | |
89a80ed4 | 239 | len = skb->len; |
248f219c DH |
240 | if (flags & RXRPC_JUMBO_PACKET) |
241 | len = RXRPC_JUMBO_DATALEN; | |
242 | ||
243 | if (flags & RXRPC_LAST_PACKET) { | |
816c9fce | 244 | if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) && |
248f219c DH |
245 | seq != call->rx_top) |
246 | return rxrpc_proto_abort("LSN", call, seq); | |
247 | } else { | |
248 | if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) && | |
249 | after_eq(seq, call->rx_top)) | |
250 | return rxrpc_proto_abort("LSA", call, seq); | |
17926a79 DH |
251 | } |
252 | ||
248f219c DH |
253 | if (before_eq(seq, hard_ack)) { |
254 | ack = RXRPC_ACK_DUPLICATE; | |
255 | ack_serial = serial; | |
256 | goto skip; | |
257 | } | |
258 | ||
259 | if (flags & RXRPC_REQUEST_ACK && !ack) { | |
260 | ack = RXRPC_ACK_REQUESTED; | |
261 | ack_serial = serial; | |
262 | } | |
263 | ||
264 | if (call->rxtx_buffer[ix]) { | |
75e42126 | 265 | rxrpc_input_dup_data(call, seq, annotation, &jumbo_bad); |
248f219c DH |
266 | if (ack != RXRPC_ACK_DUPLICATE) { |
267 | ack = RXRPC_ACK_DUPLICATE; | |
268 | ack_serial = serial; | |
17926a79 | 269 | } |
248f219c DH |
270 | immediate_ack = true; |
271 | goto skip; | |
17926a79 DH |
272 | } |
273 | ||
248f219c DH |
274 | /* Queue the packet. We use a couple of memory barriers here as need |
275 | * to make sure that rx_top is perceived to be set after the buffer | |
276 | * pointer and that the buffer pointer is set after the annotation and | |
277 | * the skb data. | |
278 | * | |
279 | * Barriers against rxrpc_recvmsg_data() and rxrpc_rotate_rx_window() | |
280 | * and also rxrpc_fill_out_ack(). | |
281 | */ | |
71f3ca40 | 282 | rxrpc_get_skb(skb, rxrpc_skb_rx_got); |
248f219c DH |
283 | call->rxtx_annotations[ix] = annotation; |
284 | smp_wmb(); | |
285 | call->rxtx_buffer[ix] = skb; | |
286 | if (after(seq, call->rx_top)) | |
287 | smp_store_release(&call->rx_top, seq); | |
58dc63c9 | 288 | if (flags & RXRPC_LAST_PACKET) { |
816c9fce | 289 | set_bit(RXRPC_CALL_RX_LAST, &call->flags); |
58dc63c9 DH |
290 | trace_rxrpc_receive(call, rxrpc_receive_queue_last, serial, seq); |
291 | } else { | |
292 | trace_rxrpc_receive(call, rxrpc_receive_queue, serial, seq); | |
293 | } | |
248f219c DH |
294 | queued = true; |
295 | ||
296 | if (after_eq(seq, call->rx_expect_next)) { | |
297 | if (after(seq, call->rx_expect_next)) { | |
298 | _net("OOS %u > %u", seq, call->rx_expect_next); | |
299 | ack = RXRPC_ACK_OUT_OF_SEQUENCE; | |
300 | ack_serial = serial; | |
301 | } | |
302 | call->rx_expect_next = seq + 1; | |
17926a79 DH |
303 | } |
304 | ||
248f219c DH |
305 | skip: |
306 | offset += len; | |
307 | if (flags & RXRPC_JUMBO_PACKET) { | |
308 | if (skb_copy_bits(skb, offset, &flags, 1) < 0) | |
309 | return rxrpc_proto_abort("XJF", call, seq); | |
310 | offset += sizeof(struct rxrpc_jumbo_header); | |
311 | seq++; | |
312 | serial++; | |
313 | annotation++; | |
314 | if (flags & RXRPC_JUMBO_PACKET) | |
315 | annotation |= RXRPC_RX_ANNO_JLAST; | |
75e42126 DH |
316 | if (after(seq, hard_ack + call->rx_winsize)) { |
317 | ack = RXRPC_ACK_EXCEEDS_WINDOW; | |
318 | ack_serial = serial; | |
319 | if (!jumbo_bad) { | |
320 | call->nr_jumbo_bad++; | |
321 | jumbo_bad = true; | |
322 | } | |
323 | goto ack; | |
324 | } | |
248f219c DH |
325 | |
326 | _proto("Rx DATA Jumbo %%%u", serial); | |
327 | goto next_subpacket; | |
328 | } | |
17926a79 | 329 | |
248f219c DH |
330 | if (queued && flags & RXRPC_LAST_PACKET && !ack) { |
331 | ack = RXRPC_ACK_DELAY; | |
332 | ack_serial = serial; | |
333 | } | |
17926a79 | 334 | |
248f219c DH |
335 | ack: |
336 | if (ack) | |
337 | rxrpc_propose_ACK(call, ack, skew, ack_serial, | |
338 | immediate_ack, true); | |
17926a79 | 339 | |
248f219c DH |
340 | if (sp->hdr.seq == READ_ONCE(call->rx_hard_ack) + 1) |
341 | rxrpc_notify_socket(call); | |
342 | _leave(" [queued]"); | |
17926a79 DH |
343 | } |
344 | ||
345 | /* | |
248f219c | 346 | * Process the extra information that may be appended to an ACK packet |
17926a79 | 347 | */ |
248f219c DH |
348 | static void rxrpc_input_ackinfo(struct rxrpc_call *call, struct sk_buff *skb, |
349 | struct rxrpc_ackinfo *ackinfo) | |
17926a79 | 350 | { |
248f219c DH |
351 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
352 | struct rxrpc_peer *peer; | |
353 | unsigned int mtu; | |
01fd0742 | 354 | u32 rwind = ntohl(ackinfo->rwind); |
248f219c DH |
355 | |
356 | _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }", | |
357 | sp->hdr.serial, | |
358 | ntohl(ackinfo->rxMTU), ntohl(ackinfo->maxMTU), | |
01fd0742 | 359 | rwind, ntohl(ackinfo->jumbo_max)); |
248f219c | 360 | |
01fd0742 DH |
361 | if (rwind > RXRPC_RXTX_BUFF_SIZE - 1) |
362 | rwind = RXRPC_RXTX_BUFF_SIZE - 1; | |
363 | call->tx_winsize = rwind; | |
248f219c DH |
364 | |
365 | mtu = min(ntohl(ackinfo->rxMTU), ntohl(ackinfo->maxMTU)); | |
366 | ||
367 | peer = call->peer; | |
368 | if (mtu < peer->maxdata) { | |
369 | spin_lock_bh(&peer->lock); | |
370 | peer->maxdata = mtu; | |
371 | peer->mtu = mtu + peer->hdrsize; | |
372 | spin_unlock_bh(&peer->lock); | |
373 | _net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata); | |
374 | } | |
375 | } | |
17926a79 | 376 | |
248f219c DH |
377 | /* |
378 | * Process individual soft ACKs. | |
379 | * | |
380 | * Each ACK in the array corresponds to one packet and can be either an ACK or | |
381 | * a NAK. If we get find an explicitly NAK'd packet we resend immediately; | |
382 | * packets that lie beyond the end of the ACK list are scheduled for resend by | |
383 | * the timer on the basis that the peer might just not have processed them at | |
384 | * the time the ACK was sent. | |
385 | */ | |
386 | static void rxrpc_input_soft_acks(struct rxrpc_call *call, u8 *acks, | |
387 | rxrpc_seq_t seq, int nr_acks) | |
388 | { | |
389 | bool resend = false; | |
390 | int ix; | |
f07373ea | 391 | u8 annotation, anno_type; |
248f219c DH |
392 | |
393 | for (; nr_acks > 0; nr_acks--, seq++) { | |
394 | ix = seq & RXRPC_RXTX_BUFF_MASK; | |
f07373ea DH |
395 | annotation = call->rxtx_annotations[ix]; |
396 | anno_type = annotation & RXRPC_TX_ANNO_MASK; | |
397 | annotation &= ~RXRPC_TX_ANNO_MASK; | |
d01dc4c3 | 398 | switch (*acks++) { |
248f219c | 399 | case RXRPC_ACK_TYPE_ACK: |
f07373ea DH |
400 | if (anno_type == RXRPC_TX_ANNO_ACK) |
401 | continue; | |
402 | call->rxtx_annotations[ix] = | |
403 | RXRPC_TX_ANNO_ACK | annotation; | |
248f219c DH |
404 | break; |
405 | case RXRPC_ACK_TYPE_NACK: | |
f07373ea | 406 | if (anno_type == RXRPC_TX_ANNO_NAK) |
248f219c | 407 | continue; |
f07373ea DH |
408 | call->rxtx_annotations[ix] = |
409 | RXRPC_TX_ANNO_NAK | annotation; | |
248f219c DH |
410 | resend = true; |
411 | break; | |
412 | default: | |
413 | return rxrpc_proto_abort("SFT", call, 0); | |
17926a79 | 414 | } |
17926a79 | 415 | } |
248f219c DH |
416 | |
417 | if (resend && | |
418 | !test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) | |
419 | rxrpc_queue_call(call); | |
17926a79 DH |
420 | } |
421 | ||
422 | /* | |
248f219c DH |
423 | * Process an ACK packet. |
424 | * | |
425 | * ack.firstPacket is the sequence number of the first soft-ACK'd/NAK'd packet | |
426 | * in the ACK array. Anything before that is hard-ACK'd and may be discarded. | |
427 | * | |
428 | * A hard-ACK means that a packet has been processed and may be discarded; a | |
429 | * soft-ACK means that the packet may be discarded and retransmission | |
430 | * requested. A phase is complete when all packets are hard-ACK'd. | |
17926a79 | 431 | */ |
248f219c DH |
432 | static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb, |
433 | u16 skew) | |
17926a79 DH |
434 | { |
435 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
248f219c DH |
436 | union { |
437 | struct rxrpc_ackpacket ack; | |
438 | struct rxrpc_ackinfo info; | |
439 | u8 acks[RXRPC_MAXACKS]; | |
440 | } buf; | |
441 | rxrpc_seq_t first_soft_ack, hard_ack; | |
442 | int nr_acks, offset; | |
443 | ||
444 | _enter(""); | |
445 | ||
446 | if (skb_copy_bits(skb, sp->offset, &buf.ack, sizeof(buf.ack)) < 0) { | |
447 | _debug("extraction failure"); | |
448 | return rxrpc_proto_abort("XAK", call, 0); | |
17926a79 | 449 | } |
248f219c DH |
450 | sp->offset += sizeof(buf.ack); |
451 | ||
452 | first_soft_ack = ntohl(buf.ack.firstPacket); | |
453 | hard_ack = first_soft_ack - 1; | |
454 | nr_acks = buf.ack.nAcks; | |
455 | ||
ec71eb9a DH |
456 | trace_rxrpc_rx_ack(call, first_soft_ack, buf.ack.reason, nr_acks); |
457 | ||
248f219c DH |
458 | _proto("Rx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }", |
459 | sp->hdr.serial, | |
460 | ntohs(buf.ack.maxSkew), | |
461 | first_soft_ack, | |
462 | ntohl(buf.ack.previousPacket), | |
463 | ntohl(buf.ack.serial), | |
464 | rxrpc_acks(buf.ack.reason), | |
465 | buf.ack.nAcks); | |
466 | ||
467 | if (buf.ack.reason == RXRPC_ACK_PING) { | |
468 | _proto("Rx ACK %%%u PING Request", sp->hdr.serial); | |
469 | rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE, | |
470 | skew, sp->hdr.serial, true, true); | |
471 | } else if (sp->hdr.flags & RXRPC_REQUEST_ACK) { | |
563ea7d5 | 472 | rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, |
248f219c | 473 | skew, sp->hdr.serial, true, true); |
17926a79 DH |
474 | } |
475 | ||
248f219c | 476 | offset = sp->offset + nr_acks + 3; |
89a80ed4 | 477 | if (skb->len >= offset + sizeof(buf.info)) { |
248f219c DH |
478 | if (skb_copy_bits(skb, offset, &buf.info, sizeof(buf.info)) < 0) |
479 | return rxrpc_proto_abort("XAI", call, 0); | |
480 | rxrpc_input_ackinfo(call, skb, &buf.info); | |
481 | } | |
17926a79 | 482 | |
248f219c DH |
483 | if (first_soft_ack == 0) |
484 | return rxrpc_proto_abort("AK0", call, 0); | |
17926a79 | 485 | |
248f219c DH |
486 | /* Ignore ACKs unless we are or have just been transmitting. */ |
487 | switch (call->state) { | |
488 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
489 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
490 | case RXRPC_CALL_SERVER_SEND_REPLY: | |
491 | case RXRPC_CALL_SERVER_AWAIT_ACK: | |
492 | break; | |
17926a79 | 493 | default: |
248f219c DH |
494 | return; |
495 | } | |
17926a79 | 496 | |
248f219c DH |
497 | /* Discard any out-of-order or duplicate ACKs. */ |
498 | if ((int)sp->hdr.serial - (int)call->acks_latest <= 0) { | |
499 | _debug("discard ACK %d <= %d", | |
500 | sp->hdr.serial, call->acks_latest); | |
501 | return; | |
502 | } | |
503 | call->acks_latest = sp->hdr.serial; | |
17926a79 | 504 | |
248f219c DH |
505 | if (test_bit(RXRPC_CALL_TX_LAST, &call->flags) && |
506 | hard_ack == call->tx_top) { | |
507 | rxrpc_end_tx_phase(call, "ETA"); | |
508 | return; | |
509 | } | |
17926a79 | 510 | |
248f219c DH |
511 | if (before(hard_ack, call->tx_hard_ack) || |
512 | after(hard_ack, call->tx_top)) | |
513 | return rxrpc_proto_abort("AKW", call, 0); | |
17926a79 | 514 | |
248f219c DH |
515 | if (after(hard_ack, call->tx_hard_ack)) |
516 | rxrpc_rotate_tx_window(call, hard_ack); | |
17926a79 | 517 | |
248f219c DH |
518 | if (after(first_soft_ack, call->tx_top)) |
519 | return; | |
17926a79 | 520 | |
248f219c DH |
521 | if (nr_acks > call->tx_top - first_soft_ack + 1) |
522 | nr_acks = first_soft_ack - call->tx_top + 1; | |
523 | if (skb_copy_bits(skb, sp->offset, buf.acks, nr_acks) < 0) | |
524 | return rxrpc_proto_abort("XSA", call, 0); | |
525 | rxrpc_input_soft_acks(call, buf.acks, first_soft_ack, nr_acks); | |
17926a79 DH |
526 | } |
527 | ||
528 | /* | |
248f219c | 529 | * Process an ACKALL packet. |
17926a79 | 530 | */ |
248f219c | 531 | static void rxrpc_input_ackall(struct rxrpc_call *call, struct sk_buff *skb) |
17926a79 | 532 | { |
248f219c | 533 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
17926a79 | 534 | |
248f219c | 535 | _proto("Rx ACKALL %%%u", sp->hdr.serial); |
17926a79 | 536 | |
248f219c DH |
537 | rxrpc_end_tx_phase(call, "ETL"); |
538 | } | |
17926a79 | 539 | |
248f219c DH |
540 | /* |
541 | * Process an ABORT packet. | |
542 | */ | |
543 | static void rxrpc_input_abort(struct rxrpc_call *call, struct sk_buff *skb) | |
544 | { | |
545 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
546 | __be32 wtmp; | |
547 | u32 abort_code = RX_CALL_DEAD; | |
17926a79 | 548 | |
248f219c | 549 | _enter(""); |
17926a79 | 550 | |
248f219c DH |
551 | if (skb->len >= 4 && |
552 | skb_copy_bits(skb, sp->offset, &wtmp, sizeof(wtmp)) >= 0) | |
553 | abort_code = ntohl(wtmp); | |
17926a79 | 554 | |
248f219c | 555 | _proto("Rx ABORT %%%u { %x }", sp->hdr.serial, abort_code); |
17926a79 | 556 | |
248f219c DH |
557 | if (rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED, |
558 | abort_code, ECONNABORTED)) | |
559 | rxrpc_notify_socket(call); | |
17926a79 DH |
560 | } |
561 | ||
562 | /* | |
248f219c | 563 | * Process an incoming call packet. |
17926a79 | 564 | */ |
248f219c DH |
565 | static void rxrpc_input_call_packet(struct rxrpc_call *call, |
566 | struct sk_buff *skb, u16 skew) | |
17926a79 | 567 | { |
248f219c | 568 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
17926a79 | 569 | |
7727640c | 570 | _enter("%p,%p", call, skb); |
17926a79 | 571 | |
248f219c DH |
572 | switch (sp->hdr.type) { |
573 | case RXRPC_PACKET_TYPE_DATA: | |
574 | rxrpc_input_data(call, skb, skew); | |
575 | break; | |
f5c17aae | 576 | |
248f219c DH |
577 | case RXRPC_PACKET_TYPE_ACK: |
578 | rxrpc_input_ack(call, skb, skew); | |
17926a79 | 579 | break; |
17926a79 | 580 | |
248f219c DH |
581 | case RXRPC_PACKET_TYPE_BUSY: |
582 | _proto("Rx BUSY %%%u", sp->hdr.serial); | |
17926a79 | 583 | |
248f219c DH |
584 | /* Just ignore BUSY packets from the server; the retry and |
585 | * lifespan timers will take care of business. BUSY packets | |
586 | * from the client don't make sense. | |
587 | */ | |
588 | break; | |
17926a79 | 589 | |
248f219c DH |
590 | case RXRPC_PACKET_TYPE_ABORT: |
591 | rxrpc_input_abort(call, skb); | |
592 | break; | |
17926a79 | 593 | |
248f219c DH |
594 | case RXRPC_PACKET_TYPE_ACKALL: |
595 | rxrpc_input_ackall(call, skb); | |
596 | break; | |
f5c17aae | 597 | |
248f219c DH |
598 | default: |
599 | _proto("Rx %s %%%u", rxrpc_pkts[sp->hdr.type], sp->hdr.serial); | |
600 | break; | |
17926a79 | 601 | } |
248f219c | 602 | |
17926a79 DH |
603 | _leave(""); |
604 | } | |
605 | ||
606 | /* | |
607 | * post connection-level events to the connection | |
18bfeba5 DH |
608 | * - this includes challenges, responses, some aborts and call terminal packet |
609 | * retransmission. | |
17926a79 | 610 | */ |
2e7e9758 | 611 | static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn, |
17926a79 DH |
612 | struct sk_buff *skb) |
613 | { | |
614 | _enter("%p,%p", conn, skb); | |
615 | ||
17926a79 | 616 | skb_queue_tail(&conn->rx_queue, skb); |
2e7e9758 | 617 | rxrpc_queue_conn(conn); |
17926a79 DH |
618 | } |
619 | ||
44ba0698 DH |
620 | /* |
621 | * post endpoint-level events to the local endpoint | |
622 | * - this includes debug and version messages | |
623 | */ | |
624 | static void rxrpc_post_packet_to_local(struct rxrpc_local *local, | |
625 | struct sk_buff *skb) | |
626 | { | |
627 | _enter("%p,%p", local, skb); | |
628 | ||
44ba0698 | 629 | skb_queue_tail(&local->event_queue, skb); |
5acbee46 | 630 | rxrpc_queue_local(local); |
44ba0698 DH |
631 | } |
632 | ||
248f219c DH |
633 | /* |
634 | * put a packet up for transport-level abort | |
635 | */ | |
636 | static void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb) | |
637 | { | |
638 | CHECK_SLAB_OKAY(&local->usage); | |
639 | ||
640 | skb_queue_tail(&local->reject_queue, skb); | |
641 | rxrpc_queue_local(local); | |
642 | } | |
643 | ||
0d12f8a4 DH |
644 | /* |
645 | * Extract the wire header from a packet and translate the byte order. | |
646 | */ | |
647 | static noinline | |
648 | int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb) | |
649 | { | |
650 | struct rxrpc_wire_header whdr; | |
651 | ||
652 | /* dig out the RxRPC connection details */ | |
4d0fc73e | 653 | if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0) |
0d12f8a4 | 654 | return -EBADMSG; |
0d12f8a4 DH |
655 | |
656 | memset(sp, 0, sizeof(*sp)); | |
657 | sp->hdr.epoch = ntohl(whdr.epoch); | |
658 | sp->hdr.cid = ntohl(whdr.cid); | |
659 | sp->hdr.callNumber = ntohl(whdr.callNumber); | |
660 | sp->hdr.seq = ntohl(whdr.seq); | |
661 | sp->hdr.serial = ntohl(whdr.serial); | |
662 | sp->hdr.flags = whdr.flags; | |
663 | sp->hdr.type = whdr.type; | |
664 | sp->hdr.userStatus = whdr.userStatus; | |
665 | sp->hdr.securityIndex = whdr.securityIndex; | |
666 | sp->hdr._rsvd = ntohs(whdr._rsvd); | |
667 | sp->hdr.serviceId = ntohs(whdr.serviceId); | |
248f219c | 668 | sp->offset = sizeof(whdr); |
0d12f8a4 DH |
669 | return 0; |
670 | } | |
671 | ||
17926a79 DH |
672 | /* |
673 | * handle data received on the local endpoint | |
674 | * - may be called in interrupt context | |
4f95dd78 DH |
675 | * |
676 | * The socket is locked by the caller and this prevents the socket from being | |
677 | * shut down and the local endpoint from going away, thus sk_user_data will not | |
678 | * be cleared until this function returns. | |
17926a79 | 679 | */ |
248f219c | 680 | void rxrpc_data_ready(struct sock *udp_sk) |
17926a79 | 681 | { |
8496af50 | 682 | struct rxrpc_connection *conn; |
248f219c DH |
683 | struct rxrpc_channel *chan; |
684 | struct rxrpc_call *call; | |
17926a79 | 685 | struct rxrpc_skb_priv *sp; |
248f219c | 686 | struct rxrpc_local *local = udp_sk->sk_user_data; |
17926a79 | 687 | struct sk_buff *skb; |
248f219c | 688 | unsigned int channel; |
563ea7d5 | 689 | int ret, skew; |
17926a79 | 690 | |
248f219c | 691 | _enter("%p", udp_sk); |
17926a79 DH |
692 | |
693 | ASSERT(!irqs_disabled()); | |
694 | ||
248f219c | 695 | skb = skb_recv_datagram(udp_sk, 0, 1, &ret); |
17926a79 | 696 | if (!skb) { |
17926a79 DH |
697 | if (ret == -EAGAIN) |
698 | return; | |
699 | _debug("UDP socket error %d", ret); | |
700 | return; | |
701 | } | |
702 | ||
71f3ca40 | 703 | rxrpc_new_skb(skb, rxrpc_skb_rx_received); |
17926a79 DH |
704 | |
705 | _net("recv skb %p", skb); | |
706 | ||
707 | /* we'll probably need to checksum it (didn't call sock_recvmsg) */ | |
708 | if (skb_checksum_complete(skb)) { | |
71f3ca40 | 709 | rxrpc_free_skb(skb, rxrpc_skb_rx_freed); |
02c22347 | 710 | __UDP_INC_STATS(&init_net, UDP_MIB_INERRORS, 0); |
17926a79 DH |
711 | _leave(" [CSUM failed]"); |
712 | return; | |
713 | } | |
714 | ||
02c22347 | 715 | __UDP_INC_STATS(&init_net, UDP_MIB_INDATAGRAMS, 0); |
1781f7f5 | 716 | |
0d12f8a4 DH |
717 | /* The socket buffer we have is owned by UDP, with UDP's data all over |
718 | * it, but we really want our own data there. | |
719 | */ | |
17926a79 DH |
720 | skb_orphan(skb); |
721 | sp = rxrpc_skb(skb); | |
17926a79 | 722 | |
8a681c36 DH |
723 | if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) { |
724 | static int lose; | |
725 | if ((lose++ & 7) == 7) { | |
726 | rxrpc_lose_skb(skb, rxrpc_skb_rx_lost); | |
727 | return; | |
728 | } | |
729 | } | |
730 | ||
17926a79 DH |
731 | _net("Rx UDP packet from %08x:%04hu", |
732 | ntohl(ip_hdr(skb)->saddr), ntohs(udp_hdr(skb)->source)); | |
733 | ||
734 | /* dig out the RxRPC connection details */ | |
0d12f8a4 | 735 | if (rxrpc_extract_header(sp, skb) < 0) |
17926a79 | 736 | goto bad_message; |
49e19ec7 | 737 | trace_rxrpc_rx_packet(sp); |
17926a79 DH |
738 | |
739 | _net("Rx RxRPC %s ep=%x call=%x:%x", | |
740 | sp->hdr.flags & RXRPC_CLIENT_INITIATED ? "ToServer" : "ToClient", | |
0d12f8a4 | 741 | sp->hdr.epoch, sp->hdr.cid, sp->hdr.callNumber); |
17926a79 | 742 | |
351c1e64 DH |
743 | if (sp->hdr.type >= RXRPC_N_PACKET_TYPES || |
744 | !((RXRPC_SUPPORTED_PACKET_TYPES >> sp->hdr.type) & 1)) { | |
17926a79 DH |
745 | _proto("Rx Bad Packet Type %u", sp->hdr.type); |
746 | goto bad_message; | |
747 | } | |
748 | ||
248f219c DH |
749 | switch (sp->hdr.type) { |
750 | case RXRPC_PACKET_TYPE_VERSION: | |
44ba0698 DH |
751 | rxrpc_post_packet_to_local(local, skb); |
752 | goto out; | |
bc6e1ea3 | 753 | |
248f219c DH |
754 | case RXRPC_PACKET_TYPE_BUSY: |
755 | if (sp->hdr.flags & RXRPC_CLIENT_INITIATED) | |
756 | goto discard; | |
757 | ||
758 | case RXRPC_PACKET_TYPE_DATA: | |
759 | if (sp->hdr.callNumber == 0) | |
760 | goto bad_message; | |
761 | if (sp->hdr.flags & RXRPC_JUMBO_PACKET && | |
762 | !rxrpc_validate_jumbo(skb)) | |
763 | goto bad_message; | |
764 | break; | |
765 | } | |
17926a79 | 766 | |
8496af50 DH |
767 | rcu_read_lock(); |
768 | ||
8496af50 | 769 | conn = rxrpc_find_connection_rcu(local, skb); |
248f219c DH |
770 | if (conn) { |
771 | if (sp->hdr.securityIndex != conn->security_ix) | |
772 | goto wrong_security; | |
563ea7d5 | 773 | |
248f219c DH |
774 | if (sp->hdr.callNumber == 0) { |
775 | /* Connection-level packet */ | |
776 | _debug("CONN %p {%d}", conn, conn->debug_id); | |
777 | rxrpc_post_packet_to_conn(conn, skb); | |
778 | goto out_unlock; | |
779 | } | |
780 | ||
781 | /* Note the serial number skew here */ | |
782 | skew = (int)sp->hdr.serial - (int)conn->hi_serial; | |
783 | if (skew >= 0) { | |
784 | if (skew > 0) | |
785 | conn->hi_serial = sp->hdr.serial; | |
786 | } else { | |
787 | skew = -skew; | |
788 | skew = min(skew, 65535); | |
789 | } | |
17926a79 | 790 | |
8496af50 | 791 | /* Call-bound packets are routed by connection channel. */ |
248f219c DH |
792 | channel = sp->hdr.cid & RXRPC_CHANNELMASK; |
793 | chan = &conn->channels[channel]; | |
18bfeba5 DH |
794 | |
795 | /* Ignore really old calls */ | |
796 | if (sp->hdr.callNumber < chan->last_call) | |
797 | goto discard_unlock; | |
798 | ||
799 | if (sp->hdr.callNumber == chan->last_call) { | |
248f219c DH |
800 | /* For the previous service call, if completed successfully, we |
801 | * discard all further packets. | |
18bfeba5 | 802 | */ |
2266ffde | 803 | if (rxrpc_conn_is_service(conn) && |
18bfeba5 DH |
804 | (chan->last_type == RXRPC_PACKET_TYPE_ACK || |
805 | sp->hdr.type == RXRPC_PACKET_TYPE_ABORT)) | |
806 | goto discard_unlock; | |
807 | ||
248f219c DH |
808 | /* But otherwise we need to retransmit the final packet from |
809 | * data cached in the connection record. | |
18bfeba5 DH |
810 | */ |
811 | rxrpc_post_packet_to_conn(conn, skb); | |
812 | goto out_unlock; | |
813 | } | |
0d12f8a4 | 814 | |
18bfeba5 | 815 | call = rcu_dereference(chan->call); |
248f219c DH |
816 | } else { |
817 | skew = 0; | |
818 | call = NULL; | |
819 | } | |
8496af50 | 820 | |
248f219c DH |
821 | if (!call || atomic_read(&call->usage) == 0) { |
822 | if (!(sp->hdr.type & RXRPC_CLIENT_INITIATED) || | |
823 | sp->hdr.callNumber == 0 || | |
824 | sp->hdr.type != RXRPC_PACKET_TYPE_DATA) | |
825 | goto bad_message_unlock; | |
826 | if (sp->hdr.seq != 1) | |
827 | goto discard_unlock; | |
828 | call = rxrpc_new_incoming_call(local, conn, skb); | |
829 | if (!call) { | |
830 | rcu_read_unlock(); | |
831 | goto reject_packet; | |
832 | } | |
7727640c | 833 | } |
44ba0698 | 834 | |
248f219c DH |
835 | rxrpc_input_call_packet(call, skb, skew); |
836 | goto discard_unlock; | |
837 | ||
18bfeba5 | 838 | discard_unlock: |
8496af50 | 839 | rcu_read_unlock(); |
248f219c | 840 | discard: |
71f3ca40 | 841 | rxrpc_free_skb(skb, rxrpc_skb_rx_freed); |
44ba0698 | 842 | out: |
49e19ec7 | 843 | trace_rxrpc_rx_done(0, 0); |
17926a79 DH |
844 | return; |
845 | ||
248f219c | 846 | out_unlock: |
8496af50 | 847 | rcu_read_unlock(); |
248f219c | 848 | goto out; |
8496af50 | 849 | |
248f219c DH |
850 | wrong_security: |
851 | rcu_read_unlock(); | |
852 | trace_rxrpc_abort("SEC", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, | |
853 | RXKADINCONSISTENCY, EBADMSG); | |
854 | skb->priority = RXKADINCONSISTENCY; | |
855 | goto post_abort; | |
17926a79 | 856 | |
248f219c DH |
857 | bad_message_unlock: |
858 | rcu_read_unlock(); | |
17926a79 | 859 | bad_message: |
248f219c DH |
860 | trace_rxrpc_abort("BAD", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, |
861 | RX_PROTOCOL_ERROR, EBADMSG); | |
17926a79 | 862 | skb->priority = RX_PROTOCOL_ERROR; |
248f219c DH |
863 | post_abort: |
864 | skb->mark = RXRPC_SKB_MARK_LOCAL_ABORT; | |
49e19ec7 DH |
865 | reject_packet: |
866 | trace_rxrpc_rx_done(skb->mark, skb->priority); | |
17926a79 | 867 | rxrpc_reject_packet(local, skb); |
17926a79 DH |
868 | _leave(" [badmsg]"); |
869 | } |