1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* RxRPC packet reception
4 * Copyright (C) 2007, 2016, 2022 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10 #include "ar-internal.h"
12 static int rxrpc_input_packet_on_conn(struct rxrpc_connection *conn,
13 struct sockaddr_rxrpc *peer_srx,
17 * handle data received on the local endpoint
18 * - may be called in interrupt context
20 * [!] Note that as this is called from the encap_rcv hook, the socket is not
21 * held locked by the caller and nothing prevents sk_user_data on the UDP from
22 * being cleared in the middle of processing this function.
24 * Called with the RCU read lock held from the IP layer via UDP.
26 int rxrpc_encap_rcv(struct sock *udp_sk, struct sk_buff *skb)
28 struct sk_buff_head *rx_queue;
29 struct rxrpc_local *local = rcu_dereference_sk_user_data(udp_sk);
31 if (unlikely(!local)) {
36 skb->tstamp = ktime_get_real();
38 skb->mark = RXRPC_SKB_MARK_PACKET;
39 rxrpc_new_skb(skb, rxrpc_skb_new_encap_rcv);
40 rx_queue = &local->rx_queue;
41 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
42 if (rxrpc_inject_rx_delay ||
43 !skb_queue_empty(&local->rx_delay_queue)) {
44 skb->tstamp = ktime_add_ms(skb->tstamp, rxrpc_inject_rx_delay);
45 rx_queue = &local->rx_delay_queue;
49 skb_queue_tail(rx_queue, skb);
50 rxrpc_wake_up_io_thread(local);
55 * Handle an error received on the local endpoint.
57 void rxrpc_error_report(struct sock *sk)
59 struct rxrpc_local *local;
63 local = rcu_dereference_sk_user_data(sk);
64 if (unlikely(!local)) {
69 while ((skb = skb_dequeue(&sk->sk_error_queue))) {
70 skb->mark = RXRPC_SKB_MARK_ERROR;
71 rxrpc_new_skb(skb, rxrpc_skb_new_error_report);
72 skb_queue_tail(&local->rx_queue, skb);
75 rxrpc_wake_up_io_thread(local);
80 * Directly produce an abort from a packet.
82 bool rxrpc_direct_abort(struct sk_buff *skb, enum rxrpc_abort_reason why,
83 s32 abort_code, int err)
85 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
87 trace_rxrpc_abort(0, why, sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
89 skb->mark = RXRPC_SKB_MARK_REJECT_ABORT;
90 skb->priority = abort_code;
94 static bool rxrpc_bad_message(struct sk_buff *skb, enum rxrpc_abort_reason why)
96 return rxrpc_direct_abort(skb, why, RX_PROTOCOL_ERROR, -EBADMSG);
99 #define just_discard true
102 * Process event packets targeted at a local endpoint.
104 static bool rxrpc_input_version(struct rxrpc_local *local, struct sk_buff *skb)
106 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
111 rxrpc_see_skb(skb, rxrpc_skb_see_version);
112 if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header), &v, 1) >= 0) {
114 rxrpc_send_version_request(local, &sp->hdr, skb);
121 * Extract the wire header from a packet and translate the byte order.
123 static bool rxrpc_extract_header(struct rxrpc_skb_priv *sp,
126 struct rxrpc_wire_header whdr;
128 /* dig out the RxRPC connection details */
129 if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0)
130 return rxrpc_bad_message(skb, rxrpc_badmsg_short_hdr);
132 memset(sp, 0, sizeof(*sp));
133 sp->hdr.epoch = ntohl(whdr.epoch);
134 sp->hdr.cid = ntohl(whdr.cid);
135 sp->hdr.callNumber = ntohl(whdr.callNumber);
136 sp->hdr.seq = ntohl(whdr.seq);
137 sp->hdr.serial = ntohl(whdr.serial);
138 sp->hdr.flags = whdr.flags;
139 sp->hdr.type = whdr.type;
140 sp->hdr.userStatus = whdr.userStatus;
141 sp->hdr.securityIndex = whdr.securityIndex;
142 sp->hdr._rsvd = ntohs(whdr._rsvd);
143 sp->hdr.serviceId = ntohs(whdr.serviceId);
148 * Extract the abort code from an ABORT packet and stash it in skb->priority.
150 static bool rxrpc_extract_abort(struct sk_buff *skb)
154 if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
155 &wtmp, sizeof(wtmp)) < 0)
157 skb->priority = ntohl(wtmp);
162 * Process packets received on the local endpoint
164 static bool rxrpc_input_packet(struct rxrpc_local *local, struct sk_buff **_skb)
166 struct rxrpc_connection *conn;
167 struct sockaddr_rxrpc peer_srx;
168 struct rxrpc_skb_priv *sp;
169 struct rxrpc_peer *peer = NULL;
170 struct sk_buff *skb = *_skb;
173 skb_pull(skb, sizeof(struct udphdr));
177 /* dig out the RxRPC connection details */
178 if (!rxrpc_extract_header(sp, skb))
181 if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) {
183 if ((lose++ & 7) == 7) {
184 trace_rxrpc_rx_lose(sp);
189 trace_rxrpc_rx_packet(sp);
191 switch (sp->hdr.type) {
192 case RXRPC_PACKET_TYPE_VERSION:
193 if (rxrpc_to_client(sp))
195 return rxrpc_input_version(local, skb);
197 case RXRPC_PACKET_TYPE_BUSY:
198 if (rxrpc_to_server(sp))
201 case RXRPC_PACKET_TYPE_ACK:
202 case RXRPC_PACKET_TYPE_ACKALL:
203 if (sp->hdr.callNumber == 0)
204 return rxrpc_bad_message(skb, rxrpc_badmsg_zero_call);
206 case RXRPC_PACKET_TYPE_ABORT:
207 if (!rxrpc_extract_abort(skb))
208 return just_discard; /* Just discard if malformed */
211 case RXRPC_PACKET_TYPE_DATA:
212 if (sp->hdr.callNumber == 0)
213 return rxrpc_bad_message(skb, rxrpc_badmsg_zero_call);
214 if (sp->hdr.seq == 0)
215 return rxrpc_bad_message(skb, rxrpc_badmsg_zero_seq);
217 /* Unshare the packet so that it can be modified for in-place
220 if (sp->hdr.securityIndex != 0) {
221 skb = skb_unshare(skb, GFP_ATOMIC);
223 rxrpc_eaten_skb(*_skb, rxrpc_skb_eaten_by_unshare_nomem);
229 rxrpc_eaten_skb(*_skb, rxrpc_skb_eaten_by_unshare);
231 rxrpc_new_skb(skb, rxrpc_skb_new_unshared);
237 case RXRPC_PACKET_TYPE_CHALLENGE:
238 if (rxrpc_to_server(sp))
241 case RXRPC_PACKET_TYPE_RESPONSE:
242 if (rxrpc_to_client(sp))
246 /* Packet types 9-11 should just be ignored. */
247 case RXRPC_PACKET_TYPE_PARAMS:
248 case RXRPC_PACKET_TYPE_10:
249 case RXRPC_PACKET_TYPE_11:
253 return rxrpc_bad_message(skb, rxrpc_badmsg_unsupported_packet);
256 if (sp->hdr.serviceId == 0)
257 return rxrpc_bad_message(skb, rxrpc_badmsg_zero_service);
259 if (WARN_ON_ONCE(rxrpc_extract_addr_from_skb(&peer_srx, skb) < 0))
260 return just_discard; /* Unsupported address type. */
262 if (peer_srx.transport.family != local->srx.transport.family &&
263 (peer_srx.transport.family == AF_INET &&
264 local->srx.transport.family != AF_INET6)) {
265 pr_warn_ratelimited("AF_RXRPC: Protocol mismatch %u not %u\n",
266 peer_srx.transport.family,
267 local->srx.transport.family);
268 return just_discard; /* Wrong address type. */
271 if (rxrpc_to_client(sp)) {
273 conn = rxrpc_find_client_connection_rcu(local, &peer_srx, skb);
274 conn = rxrpc_get_connection_maybe(conn, rxrpc_conn_get_call_input);
277 return rxrpc_protocol_error(skb, rxrpc_eproto_no_client_conn);
279 ret = rxrpc_input_packet_on_conn(conn, &peer_srx, skb);
280 rxrpc_put_connection(conn, rxrpc_conn_put_call_input);
284 /* We need to look up service connections by the full protocol
285 * parameter set. We look up the peer first as an intermediate step
286 * and then the connection from the peer's tree.
290 peer = rxrpc_lookup_peer_rcu(local, &peer_srx);
293 return rxrpc_new_incoming_call(local, NULL, NULL, &peer_srx, skb);
296 conn = rxrpc_find_service_conn_rcu(peer, skb);
297 conn = rxrpc_get_connection_maybe(conn, rxrpc_conn_get_call_input);
300 ret = rxrpc_input_packet_on_conn(conn, &peer_srx, skb);
301 rxrpc_put_connection(conn, rxrpc_conn_put_call_input);
305 peer = rxrpc_get_peer_maybe(peer, rxrpc_peer_get_input);
308 ret = rxrpc_new_incoming_call(local, peer, NULL, &peer_srx, skb);
309 rxrpc_put_peer(peer, rxrpc_peer_put_input);
314 * Deal with a packet that's associated with an extant connection.
316 static int rxrpc_input_packet_on_conn(struct rxrpc_connection *conn,
317 struct sockaddr_rxrpc *peer_srx,
320 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
321 struct rxrpc_channel *chan;
322 struct rxrpc_call *call = NULL;
323 unsigned int channel;
326 if (sp->hdr.securityIndex != conn->security_ix)
327 return rxrpc_direct_abort(skb, rxrpc_eproto_wrong_security,
328 RXKADINCONSISTENCY, -EBADMSG);
330 if (sp->hdr.serviceId != conn->service_id) {
333 if (!test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags))
334 return rxrpc_protocol_error(skb, rxrpc_eproto_reupgrade);
336 old_id = cmpxchg(&conn->service_id, conn->orig_service_id,
338 if (old_id != conn->orig_service_id &&
339 old_id != sp->hdr.serviceId)
340 return rxrpc_protocol_error(skb, rxrpc_eproto_bad_upgrade);
343 if (after(sp->hdr.serial, conn->hi_serial))
344 conn->hi_serial = sp->hdr.serial;
346 /* It's a connection-level packet if the call number is 0. */
347 if (sp->hdr.callNumber == 0)
348 return rxrpc_input_conn_packet(conn, skb);
350 /* Call-bound packets are routed by connection channel. */
351 channel = sp->hdr.cid & RXRPC_CHANNELMASK;
352 chan = &conn->channels[channel];
354 /* Ignore really old calls */
355 if (sp->hdr.callNumber < chan->last_call)
358 if (sp->hdr.callNumber == chan->last_call) {
360 sp->hdr.type == RXRPC_PACKET_TYPE_ABORT)
363 /* For the previous service call, if completed successfully, we
364 * discard all further packets.
366 if (rxrpc_conn_is_service(conn) &&
367 chan->last_type == RXRPC_PACKET_TYPE_ACK)
370 /* But otherwise we need to retransmit the final packet from
371 * data cached in the connection record.
373 if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA)
374 trace_rxrpc_rx_data(chan->call_debug_id,
378 rxrpc_conn_retransmit_call(conn, skb, channel);
382 call = rxrpc_try_get_call(chan->call, rxrpc_call_get_input);
384 if (sp->hdr.callNumber > chan->call_id) {
385 if (rxrpc_to_client(sp)) {
386 rxrpc_put_call(call, rxrpc_call_put_input);
387 return rxrpc_protocol_error(skb,
388 rxrpc_eproto_unexpected_implicit_end);
392 rxrpc_implicit_end_call(call, skb);
393 rxrpc_put_call(call, rxrpc_call_put_input);
399 if (rxrpc_to_client(sp))
400 return rxrpc_protocol_error(skb, rxrpc_eproto_no_client_call);
401 return rxrpc_new_incoming_call(conn->local, conn->peer, conn,
405 ret = rxrpc_input_call_event(call, skb);
406 rxrpc_put_call(call, rxrpc_call_put_input);
411 * I/O and event handling thread.
413 int rxrpc_io_thread(void *data)
415 struct rxrpc_connection *conn;
416 struct sk_buff_head rx_queue;
417 struct rxrpc_local *local = data;
418 struct rxrpc_call *call;
420 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
425 complete(&local->io_thread_ready);
427 skb_queue_head_init(&rx_queue);
429 set_user_nice(current, MIN_NICE);
432 rxrpc_inc_stat(local->rxnet, stat_io_loop);
434 /* Deal with connections that want immediate attention. */
435 conn = list_first_entry_or_null(&local->conn_attend_q,
436 struct rxrpc_connection,
439 spin_lock_bh(&local->lock);
440 list_del_init(&conn->attend_link);
441 spin_unlock_bh(&local->lock);
443 rxrpc_input_conn_event(conn, NULL);
444 rxrpc_put_connection(conn, rxrpc_conn_put_poke);
448 if (test_and_clear_bit(RXRPC_CLIENT_CONN_REAP_TIMER,
449 &local->client_conn_flags))
450 rxrpc_discard_expired_client_conns(local);
452 /* Deal with calls that want immediate attention. */
453 if ((call = list_first_entry_or_null(&local->call_attend_q,
456 spin_lock_bh(&local->lock);
457 list_del_init(&call->attend_link);
458 spin_unlock_bh(&local->lock);
460 trace_rxrpc_call_poked(call);
461 rxrpc_input_call_event(call, NULL);
462 rxrpc_put_call(call, rxrpc_call_put_poke);
466 if (!list_empty(&local->new_client_calls))
467 rxrpc_connect_client_calls(local);
469 /* Process received packets and errors. */
470 if ((skb = __skb_dequeue(&rx_queue))) {
471 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
473 case RXRPC_SKB_MARK_PACKET:
475 if (!rxrpc_input_packet(local, &skb))
476 rxrpc_reject_packet(local, skb);
477 trace_rxrpc_rx_done(skb->mark, skb->priority);
478 rxrpc_free_skb(skb, rxrpc_skb_put_input);
480 case RXRPC_SKB_MARK_ERROR:
481 rxrpc_input_error(local, skb);
482 rxrpc_free_skb(skb, rxrpc_skb_put_error_report);
484 case RXRPC_SKB_MARK_SERVICE_CONN_SECURED:
485 rxrpc_input_conn_event(sp->conn, skb);
486 rxrpc_put_connection(sp->conn, rxrpc_conn_put_poke);
487 rxrpc_free_skb(skb, rxrpc_skb_put_conn_secured);
491 rxrpc_free_skb(skb, rxrpc_skb_put_unknown);
497 /* Inject a delay into packets if requested. */
498 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
499 now = ktime_get_real();
500 while ((skb = skb_peek(&local->rx_delay_queue))) {
501 if (ktime_before(now, skb->tstamp))
503 skb = skb_dequeue(&local->rx_delay_queue);
504 skb_queue_tail(&local->rx_queue, skb);
508 if (!skb_queue_empty(&local->rx_queue)) {
509 spin_lock_irq(&local->rx_queue.lock);
510 skb_queue_splice_tail_init(&local->rx_queue, &rx_queue);
511 spin_unlock_irq(&local->rx_queue.lock);
515 set_current_state(TASK_INTERRUPTIBLE);
516 should_stop = kthread_should_stop();
517 if (!skb_queue_empty(&local->rx_queue) ||
518 !list_empty(&local->call_attend_q) ||
519 !list_empty(&local->conn_attend_q) ||
520 !list_empty(&local->new_client_calls) ||
521 test_bit(RXRPC_CLIENT_CONN_REAP_TIMER,
522 &local->client_conn_flags)) {
523 __set_current_state(TASK_RUNNING);
530 #ifdef CONFIG_AF_RXRPC_INJECT_RX_DELAY
531 skb = skb_peek(&local->rx_delay_queue);
533 unsigned long timeout;
534 ktime_t tstamp = skb->tstamp;
535 ktime_t now = ktime_get_real();
536 s64 delay_ns = ktime_to_ns(ktime_sub(tstamp, now));
539 __set_current_state(TASK_RUNNING);
543 timeout = nsecs_to_jiffies(delay_ns);
544 timeout = max(timeout, 1UL);
545 schedule_timeout(timeout);
546 __set_current_state(TASK_RUNNING);
554 __set_current_state(TASK_RUNNING);
555 rxrpc_see_local(local, rxrpc_local_stop);
556 rxrpc_destroy_local(local);
557 local->io_thread = NULL;
558 rxrpc_see_local(local, rxrpc_local_stopped);