1 /* connection-level event handling
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
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.
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14 #include <linux/module.h>
15 #include <linux/net.h>
16 #include <linux/skbuff.h>
17 #include <linux/errqueue.h>
19 #include <net/af_rxrpc.h>
21 #include "ar-internal.h"
24 * Retransmit terminal ACK or ABORT of the previous call.
26 static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
30 struct rxrpc_skb_priv *sp = skb ? rxrpc_skb(skb) : NULL;
31 struct rxrpc_channel *chan;
35 struct rxrpc_wire_header whdr;
38 struct rxrpc_ackpacket ack;
40 } __attribute__((packed)) pkt;
41 struct rxrpc_ackinfo ack_info;
44 u32 serial, mtu, call_id, padding;
46 _enter("%d", conn->debug_id);
48 chan = &conn->channels[channel];
50 /* If the last call got moved on whilst we were waiting to run, just
53 call_id = READ_ONCE(chan->last_call);
54 /* Sync with __rxrpc_disconnect_call() */
56 if (skb && call_id != sp->hdr.callNumber)
59 msg.msg_name = &conn->params.peer->srx.transport;
60 msg.msg_namelen = conn->params.peer->srx.transport_len;
61 msg.msg_control = NULL;
62 msg.msg_controllen = 0;
65 iov[0].iov_base = &pkt;
66 iov[0].iov_len = sizeof(pkt.whdr);
67 iov[1].iov_base = &padding;
69 iov[2].iov_base = &ack_info;
70 iov[2].iov_len = sizeof(ack_info);
72 pkt.whdr.epoch = htonl(conn->proto.epoch);
73 pkt.whdr.cid = htonl(conn->proto.cid);
74 pkt.whdr.callNumber = htonl(call_id);
76 pkt.whdr.type = chan->last_type;
77 pkt.whdr.flags = conn->out_clientflag;
78 pkt.whdr.userStatus = 0;
79 pkt.whdr.securityIndex = conn->security_ix;
81 pkt.whdr.serviceId = htons(conn->service_id);
83 len = sizeof(pkt.whdr);
84 switch (chan->last_type) {
85 case RXRPC_PACKET_TYPE_ABORT:
86 pkt.abort_code = htonl(chan->last_abort);
87 iov[0].iov_len += sizeof(pkt.abort_code);
88 len += sizeof(pkt.abort_code);
92 case RXRPC_PACKET_TYPE_ACK:
93 mtu = conn->params.peer->if_mtu;
94 mtu -= conn->params.peer->hdrsize;
95 pkt.ack.bufferSpace = 0;
96 pkt.ack.maxSkew = htons(skb ? skb->priority : 0);
97 pkt.ack.firstPacket = htonl(chan->last_seq + 1);
98 pkt.ack.previousPacket = htonl(chan->last_seq);
99 pkt.ack.serial = htonl(skb ? sp->hdr.serial : 0);
100 pkt.ack.reason = skb ? RXRPC_ACK_DUPLICATE : RXRPC_ACK_IDLE;
102 ack_info.rxMTU = htonl(rxrpc_rx_mtu);
103 ack_info.maxMTU = htonl(mtu);
104 ack_info.rwind = htonl(rxrpc_rx_window_size);
105 ack_info.jumbo_max = htonl(rxrpc_rx_jumbo_max);
106 pkt.whdr.flags |= RXRPC_SLOW_START_OK;
108 iov[0].iov_len += sizeof(pkt.ack);
109 len += sizeof(pkt.ack) + 3 + sizeof(ack_info);
117 /* Resync with __rxrpc_disconnect_call() and check that the last call
118 * didn't get advanced whilst we were filling out the packets.
121 if (READ_ONCE(chan->last_call) != call_id)
124 serial = atomic_inc_return(&conn->serial);
125 pkt.whdr.serial = htonl(serial);
127 switch (chan->last_type) {
128 case RXRPC_PACKET_TYPE_ABORT:
129 _proto("Tx ABORT %%%u { %d } [re]", serial, conn->local_abort);
131 case RXRPC_PACKET_TYPE_ACK:
132 trace_rxrpc_tx_ack(NULL, serial, chan->last_seq, 0,
133 RXRPC_ACK_DUPLICATE, 0);
134 _proto("Tx ACK %%%u [re]", serial);
138 ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, ioc, len);
139 conn->params.peer->last_tx_at = ktime_get_real();
141 trace_rxrpc_tx_fail(conn->debug_id, serial, ret,
142 rxrpc_tx_fail_call_final_resend);
148 * pass a connection-level abort onto all calls on that connection
150 static void rxrpc_abort_calls(struct rxrpc_connection *conn,
151 enum rxrpc_call_completion compl,
152 u32 abort_code, int error)
154 struct rxrpc_call *call;
157 _enter("{%d},%x", conn->debug_id, abort_code);
159 spin_lock(&conn->channel_lock);
161 for (i = 0; i < RXRPC_MAXCALLS; i++) {
162 call = rcu_dereference_protected(
163 conn->channels[i].call,
164 lockdep_is_held(&conn->channel_lock));
166 if (compl == RXRPC_CALL_LOCALLY_ABORTED)
167 trace_rxrpc_abort(call->debug_id,
171 if (rxrpc_set_call_completion(call, compl,
173 rxrpc_notify_socket(call);
177 spin_unlock(&conn->channel_lock);
182 * generate a connection-level abort
184 static int rxrpc_abort_connection(struct rxrpc_connection *conn,
185 int error, u32 abort_code)
187 struct rxrpc_wire_header whdr;
195 _enter("%d,,%u,%u", conn->debug_id, error, abort_code);
197 /* generate a connection-level abort */
198 spin_lock_bh(&conn->state_lock);
199 if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
200 spin_unlock_bh(&conn->state_lock);
201 _leave(" = 0 [already dead]");
205 conn->state = RXRPC_CONN_LOCALLY_ABORTED;
206 spin_unlock_bh(&conn->state_lock);
208 rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code, error);
210 msg.msg_name = &conn->params.peer->srx.transport;
211 msg.msg_namelen = conn->params.peer->srx.transport_len;
212 msg.msg_control = NULL;
213 msg.msg_controllen = 0;
216 whdr.epoch = htonl(conn->proto.epoch);
217 whdr.cid = htonl(conn->proto.cid);
220 whdr.type = RXRPC_PACKET_TYPE_ABORT;
221 whdr.flags = conn->out_clientflag;
223 whdr.securityIndex = conn->security_ix;
225 whdr.serviceId = htons(conn->service_id);
227 word = htonl(conn->local_abort);
229 iov[0].iov_base = &whdr;
230 iov[0].iov_len = sizeof(whdr);
231 iov[1].iov_base = &word;
232 iov[1].iov_len = sizeof(word);
234 len = iov[0].iov_len + iov[1].iov_len;
236 serial = atomic_inc_return(&conn->serial);
237 whdr.serial = htonl(serial);
238 _proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort);
240 ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
242 trace_rxrpc_tx_fail(conn->debug_id, serial, ret,
243 rxrpc_tx_fail_conn_abort);
244 _debug("sendmsg failed: %d", ret);
248 conn->params.peer->last_tx_at = ktime_get_real();
255 * mark a call as being on a now-secured channel
256 * - must be called with BH's disabled.
258 static void rxrpc_call_is_secure(struct rxrpc_call *call)
262 write_lock_bh(&call->state_lock);
263 if (call->state == RXRPC_CALL_SERVER_SECURING) {
264 call->state = RXRPC_CALL_SERVER_ACCEPTING;
265 rxrpc_notify_socket(call);
267 write_unlock_bh(&call->state_lock);
272 * connection-level Rx packet processor
274 static int rxrpc_process_event(struct rxrpc_connection *conn,
278 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
283 if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
284 _leave(" = -ECONNABORTED [%u]", conn->state);
285 return -ECONNABORTED;
288 _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);
290 switch (sp->hdr.type) {
291 case RXRPC_PACKET_TYPE_DATA:
292 case RXRPC_PACKET_TYPE_ACK:
293 rxrpc_conn_retransmit_call(conn, skb,
294 sp->hdr.cid & RXRPC_CHANNELMASK);
297 case RXRPC_PACKET_TYPE_BUSY:
298 /* Just ignore BUSY packets for now. */
301 case RXRPC_PACKET_TYPE_ABORT:
302 if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
303 &wtmp, sizeof(wtmp)) < 0) {
304 trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
305 tracepoint_string("bad_abort"));
308 abort_code = ntohl(wtmp);
309 _proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
311 conn->state = RXRPC_CONN_REMOTELY_ABORTED;
312 rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
313 abort_code, -ECONNABORTED);
314 return -ECONNABORTED;
316 case RXRPC_PACKET_TYPE_CHALLENGE:
317 return conn->security->respond_to_challenge(conn, skb,
320 case RXRPC_PACKET_TYPE_RESPONSE:
321 ret = conn->security->verify_response(conn, skb, _abort_code);
325 ret = conn->security->init_connection_security(conn);
329 ret = conn->security->prime_packet_security(conn);
333 spin_lock(&conn->channel_lock);
334 spin_lock(&conn->state_lock);
336 if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) {
337 conn->state = RXRPC_CONN_SERVICE;
338 spin_unlock(&conn->state_lock);
339 for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
340 rxrpc_call_is_secure(
341 rcu_dereference_protected(
342 conn->channels[loop].call,
343 lockdep_is_held(&conn->channel_lock)));
345 spin_unlock(&conn->state_lock);
348 spin_unlock(&conn->channel_lock);
352 trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
353 tracepoint_string("bad_conn_pkt"));
359 * set up security and issue a challenge
361 static void rxrpc_secure_connection(struct rxrpc_connection *conn)
366 _enter("{%d}", conn->debug_id);
368 ASSERT(conn->security_ix != 0);
370 if (!conn->params.key) {
371 _debug("set up security");
372 ret = rxrpc_init_server_conn_security(conn);
377 abort_code = RX_CALL_DEAD;
380 abort_code = RXKADNOAUTH;
385 if (conn->security->issue_challenge(conn) < 0) {
386 abort_code = RX_CALL_DEAD;
395 _debug("abort %d, %d", ret, abort_code);
396 rxrpc_abort_connection(conn, ret, abort_code);
397 _leave(" [aborted]");
401 * Process delayed final ACKs that we haven't subsumed into a subsequent call.
403 static void rxrpc_process_delayed_final_acks(struct rxrpc_connection *conn)
405 unsigned long j = jiffies, next_j;
406 unsigned int channel;
410 next_j = j + LONG_MAX;
412 for (channel = 0; channel < RXRPC_MAXCALLS; channel++) {
413 struct rxrpc_channel *chan = &conn->channels[channel];
414 unsigned long ack_at;
416 if (!test_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags))
419 smp_rmb(); /* vs rxrpc_disconnect_client_call */
420 ack_at = READ_ONCE(chan->final_ack_at);
422 if (time_before(j, ack_at)) {
423 if (time_before(ack_at, next_j)) {
430 if (test_and_clear_bit(RXRPC_CONN_FINAL_ACK_0 + channel,
432 rxrpc_conn_retransmit_call(conn, NULL, channel);
436 if (time_before_eq(next_j, j))
439 rxrpc_reduce_conn_timer(conn, next_j);
443 * connection-level event processor
445 void rxrpc_process_connection(struct work_struct *work)
447 struct rxrpc_connection *conn =
448 container_of(work, struct rxrpc_connection, processor);
450 u32 abort_code = RX_PROTOCOL_ERROR;
453 rxrpc_see_connection(conn);
455 if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
456 rxrpc_secure_connection(conn);
458 /* Process delayed ACKs whose time has come. */
459 if (conn->flags & RXRPC_CONN_FINAL_ACK_MASK)
460 rxrpc_process_delayed_final_acks(conn);
462 /* go through the conn-level event packets, releasing the ref on this
463 * connection that each one has when we've finished with it */
464 while ((skb = skb_dequeue(&conn->rx_queue))) {
465 rxrpc_see_skb(skb, rxrpc_skb_rx_seen);
466 ret = rxrpc_process_event(conn, skb, &abort_code);
474 goto requeue_and_leave;
477 rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
483 rxrpc_put_connection(conn);
488 skb_queue_head(&conn->rx_queue, skb);
492 if (rxrpc_abort_connection(conn, ret, abort_code) < 0)
493 goto requeue_and_leave;
494 rxrpc_free_skb(skb, rxrpc_skb_rx_freed);