1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* connection-level event handling
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10 #include <linux/module.h>
11 #include <linux/net.h>
12 #include <linux/skbuff.h>
13 #include <linux/errqueue.h>
15 #include <net/af_rxrpc.h>
17 #include "ar-internal.h"
20 * Retransmit terminal ACK or ABORT of the previous call.
22 static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
26 struct rxrpc_skb_priv *sp = skb ? rxrpc_skb(skb) : NULL;
27 struct rxrpc_channel *chan;
31 struct rxrpc_wire_header whdr;
34 struct rxrpc_ackpacket ack;
36 } __attribute__((packed)) pkt;
37 struct rxrpc_ackinfo ack_info;
40 u32 serial, mtu, call_id, padding;
42 _enter("%d", conn->debug_id);
44 chan = &conn->channels[channel];
46 /* If the last call got moved on whilst we were waiting to run, just
49 call_id = READ_ONCE(chan->last_call);
50 /* Sync with __rxrpc_disconnect_call() */
52 if (skb && call_id != sp->hdr.callNumber)
55 msg.msg_name = &conn->peer->srx.transport;
56 msg.msg_namelen = conn->peer->srx.transport_len;
57 msg.msg_control = NULL;
58 msg.msg_controllen = 0;
61 iov[0].iov_base = &pkt;
62 iov[0].iov_len = sizeof(pkt.whdr);
63 iov[1].iov_base = &padding;
65 iov[2].iov_base = &ack_info;
66 iov[2].iov_len = sizeof(ack_info);
68 pkt.whdr.epoch = htonl(conn->proto.epoch);
69 pkt.whdr.cid = htonl(conn->proto.cid | channel);
70 pkt.whdr.callNumber = htonl(call_id);
72 pkt.whdr.type = chan->last_type;
73 pkt.whdr.flags = conn->out_clientflag;
74 pkt.whdr.userStatus = 0;
75 pkt.whdr.securityIndex = conn->security_ix;
77 pkt.whdr.serviceId = htons(conn->service_id);
79 len = sizeof(pkt.whdr);
80 switch (chan->last_type) {
81 case RXRPC_PACKET_TYPE_ABORT:
82 pkt.abort_code = htonl(chan->last_abort);
83 iov[0].iov_len += sizeof(pkt.abort_code);
84 len += sizeof(pkt.abort_code);
88 case RXRPC_PACKET_TYPE_ACK:
89 mtu = conn->peer->if_mtu;
90 mtu -= conn->peer->hdrsize;
91 pkt.ack.bufferSpace = 0;
92 pkt.ack.maxSkew = htons(skb ? skb->priority : 0);
93 pkt.ack.firstPacket = htonl(chan->last_seq + 1);
94 pkt.ack.previousPacket = htonl(chan->last_seq);
95 pkt.ack.serial = htonl(skb ? sp->hdr.serial : 0);
96 pkt.ack.reason = skb ? RXRPC_ACK_DUPLICATE : RXRPC_ACK_IDLE;
98 ack_info.rxMTU = htonl(rxrpc_rx_mtu);
99 ack_info.maxMTU = htonl(mtu);
100 ack_info.rwind = htonl(rxrpc_rx_window_size);
101 ack_info.jumbo_max = htonl(rxrpc_rx_jumbo_max);
102 pkt.whdr.flags |= RXRPC_SLOW_START_OK;
104 iov[0].iov_len += sizeof(pkt.ack);
105 len += sizeof(pkt.ack) + 3 + sizeof(ack_info);
113 /* Resync with __rxrpc_disconnect_call() and check that the last call
114 * didn't get advanced whilst we were filling out the packets.
117 if (READ_ONCE(chan->last_call) != call_id)
120 serial = atomic_inc_return(&conn->serial);
121 pkt.whdr.serial = htonl(serial);
123 switch (chan->last_type) {
124 case RXRPC_PACKET_TYPE_ABORT:
126 case RXRPC_PACKET_TYPE_ACK:
127 trace_rxrpc_tx_ack(chan->call_debug_id, serial,
128 ntohl(pkt.ack.firstPacket),
129 ntohl(pkt.ack.serial),
134 ret = kernel_sendmsg(conn->local->socket, &msg, iov, ioc, len);
135 conn->peer->last_tx_at = ktime_get_seconds();
137 trace_rxrpc_tx_fail(chan->call_debug_id, serial, ret,
138 rxrpc_tx_point_call_final_resend);
140 trace_rxrpc_tx_packet(chan->call_debug_id, &pkt.whdr,
141 rxrpc_tx_point_call_final_resend);
147 * pass a connection-level abort onto all calls on that connection
149 static void rxrpc_abort_calls(struct rxrpc_connection *conn,
150 enum rxrpc_call_completion compl,
151 rxrpc_serial_t serial)
153 struct rxrpc_call *call;
156 _enter("{%d},%x", conn->debug_id, conn->abort_code);
158 spin_lock(&conn->bundle->channel_lock);
160 for (i = 0; i < RXRPC_MAXCALLS; i++) {
161 call = rcu_dereference_protected(
162 conn->channels[i].call,
163 lockdep_is_held(&conn->bundle->channel_lock));
165 if (compl == RXRPC_CALL_LOCALLY_ABORTED)
166 trace_rxrpc_abort(call->debug_id,
172 trace_rxrpc_rx_abort(call, serial,
174 rxrpc_set_call_completion(call, compl,
180 spin_unlock(&conn->bundle->channel_lock);
185 * generate a connection-level abort
187 static int rxrpc_abort_connection(struct rxrpc_connection *conn,
188 int error, u32 abort_code)
190 struct rxrpc_wire_header whdr;
198 _enter("%d,,%u,%u", conn->debug_id, error, abort_code);
200 /* generate a connection-level abort */
201 spin_lock_bh(&conn->state_lock);
202 if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
203 spin_unlock_bh(&conn->state_lock);
204 _leave(" = 0 [already dead]");
209 conn->abort_code = abort_code;
210 conn->state = RXRPC_CONN_LOCALLY_ABORTED;
211 set_bit(RXRPC_CONN_DONT_REUSE, &conn->flags);
212 spin_unlock_bh(&conn->state_lock);
214 msg.msg_name = &conn->peer->srx.transport;
215 msg.msg_namelen = conn->peer->srx.transport_len;
216 msg.msg_control = NULL;
217 msg.msg_controllen = 0;
220 whdr.epoch = htonl(conn->proto.epoch);
221 whdr.cid = htonl(conn->proto.cid);
224 whdr.type = RXRPC_PACKET_TYPE_ABORT;
225 whdr.flags = conn->out_clientflag;
227 whdr.securityIndex = conn->security_ix;
229 whdr.serviceId = htons(conn->service_id);
231 word = htonl(conn->abort_code);
233 iov[0].iov_base = &whdr;
234 iov[0].iov_len = sizeof(whdr);
235 iov[1].iov_base = &word;
236 iov[1].iov_len = sizeof(word);
238 len = iov[0].iov_len + iov[1].iov_len;
240 serial = atomic_inc_return(&conn->serial);
241 rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, serial);
242 whdr.serial = htonl(serial);
244 ret = kernel_sendmsg(conn->local->socket, &msg, iov, 2, len);
246 trace_rxrpc_tx_fail(conn->debug_id, serial, ret,
247 rxrpc_tx_point_conn_abort);
248 _debug("sendmsg failed: %d", ret);
252 trace_rxrpc_tx_packet(conn->debug_id, &whdr, rxrpc_tx_point_conn_abort);
254 conn->peer->last_tx_at = ktime_get_seconds();
261 * mark a call as being on a now-secured channel
262 * - must be called with BH's disabled.
264 static void rxrpc_call_is_secure(struct rxrpc_call *call)
268 write_lock_bh(&call->state_lock);
269 if (call->state == RXRPC_CALL_SERVER_SECURING) {
270 call->state = RXRPC_CALL_SERVER_RECV_REQUEST;
271 rxrpc_notify_socket(call);
273 write_unlock_bh(&call->state_lock);
278 * connection-level Rx packet processor
280 static int rxrpc_process_event(struct rxrpc_connection *conn,
284 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
289 if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
290 _leave(" = -ECONNABORTED [%u]", conn->state);
291 return -ECONNABORTED;
294 _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);
296 switch (sp->hdr.type) {
297 case RXRPC_PACKET_TYPE_DATA:
298 case RXRPC_PACKET_TYPE_ACK:
299 rxrpc_conn_retransmit_call(conn, skb,
300 sp->hdr.cid & RXRPC_CHANNELMASK);
303 case RXRPC_PACKET_TYPE_BUSY:
304 /* Just ignore BUSY packets for now. */
307 case RXRPC_PACKET_TYPE_ABORT:
308 if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
309 &wtmp, sizeof(wtmp)) < 0) {
310 trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
311 tracepoint_string("bad_abort"));
314 abort_code = ntohl(wtmp);
316 conn->error = -ECONNABORTED;
317 conn->abort_code = abort_code;
318 conn->state = RXRPC_CONN_REMOTELY_ABORTED;
319 set_bit(RXRPC_CONN_DONT_REUSE, &conn->flags);
320 rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED, sp->hdr.serial);
321 return -ECONNABORTED;
323 case RXRPC_PACKET_TYPE_CHALLENGE:
324 return conn->security->respond_to_challenge(conn, skb,
327 case RXRPC_PACKET_TYPE_RESPONSE:
328 ret = conn->security->verify_response(conn, skb, _abort_code);
332 ret = conn->security->init_connection_security(
333 conn, conn->key->payload.data[0]);
337 spin_lock(&conn->bundle->channel_lock);
338 spin_lock_bh(&conn->state_lock);
340 if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) {
341 conn->state = RXRPC_CONN_SERVICE;
342 spin_unlock_bh(&conn->state_lock);
343 for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
344 rxrpc_call_is_secure(
345 rcu_dereference_protected(
346 conn->channels[loop].call,
347 lockdep_is_held(&conn->bundle->channel_lock)));
349 spin_unlock_bh(&conn->state_lock);
352 spin_unlock(&conn->bundle->channel_lock);
356 trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
357 tracepoint_string("bad_conn_pkt"));
363 * set up security and issue a challenge
365 static void rxrpc_secure_connection(struct rxrpc_connection *conn)
370 _enter("{%d}", conn->debug_id);
372 ASSERT(conn->security_ix != 0);
374 if (conn->security->issue_challenge(conn) < 0) {
375 abort_code = RX_CALL_DEAD;
384 _debug("abort %d, %d", ret, abort_code);
385 rxrpc_abort_connection(conn, ret, abort_code);
386 _leave(" [aborted]");
390 * Process delayed final ACKs that we haven't subsumed into a subsequent call.
392 void rxrpc_process_delayed_final_acks(struct rxrpc_connection *conn, bool force)
394 unsigned long j = jiffies, next_j;
395 unsigned int channel;
399 next_j = j + LONG_MAX;
401 for (channel = 0; channel < RXRPC_MAXCALLS; channel++) {
402 struct rxrpc_channel *chan = &conn->channels[channel];
403 unsigned long ack_at;
405 if (!test_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags))
408 smp_rmb(); /* vs rxrpc_disconnect_client_call */
409 ack_at = READ_ONCE(chan->final_ack_at);
411 if (time_before(j, ack_at) && !force) {
412 if (time_before(ack_at, next_j)) {
419 if (test_and_clear_bit(RXRPC_CONN_FINAL_ACK_0 + channel,
421 rxrpc_conn_retransmit_call(conn, NULL, channel);
425 if (time_before_eq(next_j, j))
428 rxrpc_reduce_conn_timer(conn, next_j);
432 * connection-level event processor
434 static void rxrpc_do_process_connection(struct rxrpc_connection *conn)
437 u32 abort_code = RX_PROTOCOL_ERROR;
440 if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
441 rxrpc_secure_connection(conn);
443 /* Process delayed ACKs whose time has come. */
444 if (conn->flags & RXRPC_CONN_FINAL_ACK_MASK)
445 rxrpc_process_delayed_final_acks(conn, false);
447 /* go through the conn-level event packets, releasing the ref on this
448 * connection that each one has when we've finished with it */
449 while ((skb = skb_dequeue(&conn->rx_queue))) {
450 rxrpc_see_skb(skb, rxrpc_skb_seen);
451 ret = rxrpc_process_event(conn, skb, &abort_code);
459 goto requeue_and_leave;
462 rxrpc_free_skb(skb, rxrpc_skb_freed);
470 skb_queue_head(&conn->rx_queue, skb);
474 if (rxrpc_abort_connection(conn, ret, abort_code) < 0)
475 goto requeue_and_leave;
476 rxrpc_free_skb(skb, rxrpc_skb_freed);
480 void rxrpc_process_connection(struct work_struct *work)
482 struct rxrpc_connection *conn =
483 container_of(work, struct rxrpc_connection, processor);
485 rxrpc_see_connection(conn);
487 if (__rxrpc_use_local(conn->local)) {
488 rxrpc_do_process_connection(conn);
489 rxrpc_unuse_local(conn->local);
492 rxrpc_put_connection(conn);