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,
29 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
30 struct rxrpc_channel *chan;
34 struct rxrpc_wire_header whdr;
40 struct rxrpc_ackpacket ack;
42 struct rxrpc_ackinfo info;
45 } __attribute__((packed)) pkt;
47 u32 serial, mtu, call_id;
49 _enter("%d", conn->debug_id);
51 chan = &conn->channels[sp->hdr.cid & RXRPC_CHANNELMASK];
53 /* If the last call got moved on whilst we were waiting to run, just
56 call_id = READ_ONCE(chan->last_call);
57 /* Sync with __rxrpc_disconnect_call() */
59 if (call_id != sp->hdr.callNumber)
62 msg.msg_name = &conn->params.peer->srx.transport;
63 msg.msg_namelen = conn->params.peer->srx.transport_len;
64 msg.msg_control = NULL;
65 msg.msg_controllen = 0;
68 pkt.whdr.epoch = htonl(sp->hdr.epoch);
69 pkt.whdr.cid = htonl(sp->hdr.cid);
70 pkt.whdr.callNumber = htonl(sp->hdr.callNumber);
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(chan->last_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 len += sizeof(pkt.abort);
86 case RXRPC_PACKET_TYPE_ACK:
87 mtu = conn->params.peer->if_mtu;
88 mtu -= conn->params.peer->hdrsize;
89 pkt.ack.bufferSpace = 0;
90 pkt.ack.maxSkew = htons(skb->priority);
91 pkt.ack.firstPacket = htonl(chan->last_seq);
92 pkt.ack.previousPacket = htonl(chan->last_seq - 1);
93 pkt.ack.serial = htonl(sp->hdr.serial);
94 pkt.ack.reason = RXRPC_ACK_DUPLICATE;
96 pkt.info.rxMTU = htonl(rxrpc_rx_mtu);
97 pkt.info.maxMTU = htonl(mtu);
98 pkt.info.rwind = htonl(rxrpc_rx_window_size);
99 pkt.info.jumbo_max = htonl(rxrpc_rx_jumbo_max);
100 len += sizeof(pkt.ack) + sizeof(pkt.info);
104 /* Resync with __rxrpc_disconnect_call() and check that the last call
105 * didn't get advanced whilst we were filling out the packets.
108 if (READ_ONCE(chan->last_call) != call_id)
114 serial = atomic_inc_return(&conn->serial);
115 pkt.whdr.serial = htonl(serial);
117 switch (chan->last_type) {
118 case RXRPC_PACKET_TYPE_ABORT:
119 _proto("Tx ABORT %%%u { %d } [re]", serial, conn->local_abort);
121 case RXRPC_PACKET_TYPE_ACK:
122 _proto("Tx ACK %%%u [re]", serial);
126 kernel_sendmsg(conn->params.local->socket, &msg, &iov, 1, len);
132 * pass a connection-level abort onto all calls on that connection
134 static void rxrpc_abort_calls(struct rxrpc_connection *conn,
135 enum rxrpc_call_completion compl,
136 u32 abort_code, int error)
138 struct rxrpc_call *call;
141 _enter("{%d},%x", conn->debug_id, abort_code);
143 spin_lock(&conn->channel_lock);
145 for (i = 0; i < RXRPC_MAXCALLS; i++) {
146 call = rcu_dereference_protected(
147 conn->channels[i].call,
148 lockdep_is_held(&conn->channel_lock));
150 if (compl == RXRPC_CALL_LOCALLY_ABORTED)
151 trace_rxrpc_abort("CON", call->cid,
154 if (rxrpc_set_call_completion(call, compl,
156 rxrpc_notify_socket(call);
160 spin_unlock(&conn->channel_lock);
165 * generate a connection-level abort
167 static int rxrpc_abort_connection(struct rxrpc_connection *conn,
168 u32 error, u32 abort_code)
170 struct rxrpc_wire_header whdr;
178 _enter("%d,,%u,%u", conn->debug_id, error, abort_code);
180 /* generate a connection-level abort */
181 spin_lock_bh(&conn->state_lock);
182 if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
183 spin_unlock_bh(&conn->state_lock);
184 _leave(" = 0 [already dead]");
188 conn->state = RXRPC_CONN_LOCALLY_ABORTED;
189 spin_unlock_bh(&conn->state_lock);
191 rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code, error);
193 msg.msg_name = &conn->params.peer->srx.transport;
194 msg.msg_namelen = conn->params.peer->srx.transport_len;
195 msg.msg_control = NULL;
196 msg.msg_controllen = 0;
199 whdr.epoch = htonl(conn->proto.epoch);
200 whdr.cid = htonl(conn->proto.cid);
203 whdr.type = RXRPC_PACKET_TYPE_ABORT;
204 whdr.flags = conn->out_clientflag;
206 whdr.securityIndex = conn->security_ix;
208 whdr.serviceId = htons(conn->params.service_id);
210 word = htonl(conn->local_abort);
212 iov[0].iov_base = &whdr;
213 iov[0].iov_len = sizeof(whdr);
214 iov[1].iov_base = &word;
215 iov[1].iov_len = sizeof(word);
217 len = iov[0].iov_len + iov[1].iov_len;
219 serial = atomic_inc_return(&conn->serial);
220 whdr.serial = htonl(serial);
221 _proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort);
223 ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
225 _debug("sendmsg failed: %d", ret);
234 * mark a call as being on a now-secured channel
235 * - must be called with BH's disabled.
237 static void rxrpc_call_is_secure(struct rxrpc_call *call)
241 write_lock_bh(&call->state_lock);
242 if (call->state == RXRPC_CALL_SERVER_SECURING) {
243 call->state = RXRPC_CALL_SERVER_ACCEPTING;
244 rxrpc_notify_socket(call);
246 write_unlock_bh(&call->state_lock);
251 * connection-level Rx packet processor
253 static int rxrpc_process_event(struct rxrpc_connection *conn,
257 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
262 if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
263 _leave(" = -ECONNABORTED [%u]", conn->state);
264 return -ECONNABORTED;
267 _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);
269 switch (sp->hdr.type) {
270 case RXRPC_PACKET_TYPE_DATA:
271 case RXRPC_PACKET_TYPE_ACK:
272 rxrpc_conn_retransmit_call(conn, skb);
275 case RXRPC_PACKET_TYPE_ABORT:
276 if (skb_copy_bits(skb, sp->offset, &wtmp, sizeof(wtmp)) < 0)
278 abort_code = ntohl(wtmp);
279 _proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
281 conn->state = RXRPC_CONN_REMOTELY_ABORTED;
282 rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
283 abort_code, ECONNABORTED);
284 return -ECONNABORTED;
286 case RXRPC_PACKET_TYPE_CHALLENGE:
287 return conn->security->respond_to_challenge(conn, skb,
290 case RXRPC_PACKET_TYPE_RESPONSE:
291 ret = conn->security->verify_response(conn, skb, _abort_code);
295 ret = conn->security->init_connection_security(conn);
299 ret = conn->security->prime_packet_security(conn);
303 spin_lock(&conn->channel_lock);
304 spin_lock(&conn->state_lock);
306 if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) {
307 conn->state = RXRPC_CONN_SERVICE;
308 spin_unlock(&conn->state_lock);
309 for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
310 rxrpc_call_is_secure(
311 rcu_dereference_protected(
312 conn->channels[loop].call,
313 lockdep_is_held(&conn->channel_lock)));
315 spin_unlock(&conn->state_lock);
318 spin_unlock(&conn->channel_lock);
322 _leave(" = -EPROTO [%u]", sp->hdr.type);
328 * set up security and issue a challenge
330 static void rxrpc_secure_connection(struct rxrpc_connection *conn)
335 _enter("{%d}", conn->debug_id);
337 ASSERT(conn->security_ix != 0);
339 if (!conn->params.key) {
340 _debug("set up security");
341 ret = rxrpc_init_server_conn_security(conn);
346 abort_code = RX_CALL_DEAD;
349 abort_code = RXKADNOAUTH;
354 if (conn->security->issue_challenge(conn) < 0) {
355 abort_code = RX_CALL_DEAD;
364 _debug("abort %d, %d", ret, abort_code);
365 rxrpc_abort_connection(conn, -ret, abort_code);
366 _leave(" [aborted]");
370 * connection-level event processor
372 void rxrpc_process_connection(struct work_struct *work)
374 struct rxrpc_connection *conn =
375 container_of(work, struct rxrpc_connection, processor);
377 u32 abort_code = RX_PROTOCOL_ERROR;
380 _enter("{%d}", conn->debug_id);
382 if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
383 rxrpc_secure_connection(conn);
385 /* go through the conn-level event packets, releasing the ref on this
386 * connection that each one has when we've finished with it */
387 while ((skb = skb_dequeue(&conn->rx_queue))) {
389 ret = rxrpc_process_event(conn, skb, &abort_code);
396 goto requeue_and_leave;
405 rxrpc_put_connection(conn);
410 skb_queue_head(&conn->rx_queue, skb);
414 if (rxrpc_abort_connection(conn, -ret, abort_code) < 0)
415 goto requeue_and_leave;