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>
18 #include <linux/udp.h>
20 #include <linux/in6.h>
21 #include <linux/icmp.h>
23 #include <net/af_rxrpc.h>
25 #include "ar-internal.h"
28 * pass a connection-level abort onto all calls on that connection
30 static void rxrpc_abort_calls(struct rxrpc_connection *conn, int state,
33 struct rxrpc_call *call;
36 _enter("{%d},%x", conn->debug_id, abort_code);
38 spin_lock(&conn->channel_lock);
40 for (i = 0; i < RXRPC_MAXCALLS; i++) {
41 call = rcu_dereference_protected(
42 conn->channels[i].call,
43 lockdep_is_held(&conn->channel_lock));
44 write_lock_bh(&call->state_lock);
45 if (call->state <= RXRPC_CALL_COMPLETE) {
47 if (state == RXRPC_CALL_LOCALLY_ABORTED) {
48 call->local_abort = conn->local_abort;
49 set_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events);
51 call->remote_abort = conn->remote_abort;
52 set_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events);
54 rxrpc_queue_call(call);
56 write_unlock_bh(&call->state_lock);
59 spin_unlock(&conn->channel_lock);
64 * generate a connection-level abort
66 static int rxrpc_abort_connection(struct rxrpc_connection *conn,
67 u32 error, u32 abort_code)
69 struct rxrpc_wire_header whdr;
77 _enter("%d,,%u,%u", conn->debug_id, error, abort_code);
79 /* generate a connection-level abort */
80 spin_lock_bh(&conn->state_lock);
81 if (conn->state < RXRPC_CONN_REMOTELY_ABORTED) {
82 conn->state = RXRPC_CONN_LOCALLY_ABORTED;
84 spin_unlock_bh(&conn->state_lock);
86 spin_unlock_bh(&conn->state_lock);
87 _leave(" = 0 [already dead]");
91 rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code);
93 msg.msg_name = &conn->params.peer->srx.transport;
94 msg.msg_namelen = conn->params.peer->srx.transport_len;
95 msg.msg_control = NULL;
96 msg.msg_controllen = 0;
99 whdr.epoch = htonl(conn->proto.epoch);
100 whdr.cid = htonl(conn->proto.cid);
103 whdr.type = RXRPC_PACKET_TYPE_ABORT;
104 whdr.flags = conn->out_clientflag;
106 whdr.securityIndex = conn->security_ix;
108 whdr.serviceId = htons(conn->params.service_id);
110 word = htonl(conn->local_abort);
112 iov[0].iov_base = &whdr;
113 iov[0].iov_len = sizeof(whdr);
114 iov[1].iov_base = &word;
115 iov[1].iov_len = sizeof(word);
117 len = iov[0].iov_len + iov[1].iov_len;
119 serial = atomic_inc_return(&conn->serial);
120 whdr.serial = htonl(serial);
121 _proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort);
123 ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
125 _debug("sendmsg failed: %d", ret);
134 * mark a call as being on a now-secured channel
135 * - must be called with softirqs disabled
137 static void rxrpc_call_is_secure(struct rxrpc_call *call)
141 read_lock(&call->state_lock);
142 if (call->state < RXRPC_CALL_COMPLETE &&
143 !test_and_set_bit(RXRPC_CALL_EV_SECURED, &call->events))
144 rxrpc_queue_call(call);
145 read_unlock(&call->state_lock);
150 * connection-level Rx packet processor
152 static int rxrpc_process_event(struct rxrpc_connection *conn,
156 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
161 if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
162 kleave(" = -ECONNABORTED [%u]", conn->state);
163 return -ECONNABORTED;
166 _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);
168 switch (sp->hdr.type) {
169 case RXRPC_PACKET_TYPE_ABORT:
170 if (skb_copy_bits(skb, 0, &wtmp, sizeof(wtmp)) < 0)
172 abort_code = ntohl(wtmp);
173 _proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
175 conn->state = RXRPC_CONN_REMOTELY_ABORTED;
176 rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
178 return -ECONNABORTED;
180 case RXRPC_PACKET_TYPE_CHALLENGE:
181 return conn->security->respond_to_challenge(conn, skb,
184 case RXRPC_PACKET_TYPE_RESPONSE:
185 ret = conn->security->verify_response(conn, skb, _abort_code);
189 ret = conn->security->init_connection_security(conn);
193 ret = conn->security->prime_packet_security(conn);
197 spin_lock(&conn->channel_lock);
198 spin_lock(&conn->state_lock);
200 if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) {
201 conn->state = RXRPC_CONN_SERVICE;
202 for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
203 rxrpc_call_is_secure(
204 rcu_dereference_protected(
205 conn->channels[loop].call,
206 lockdep_is_held(&conn->channel_lock)));
209 spin_unlock(&conn->state_lock);
210 spin_unlock(&conn->channel_lock);
214 _leave(" = -EPROTO [%u]", sp->hdr.type);
220 * set up security and issue a challenge
222 static void rxrpc_secure_connection(struct rxrpc_connection *conn)
227 _enter("{%d}", conn->debug_id);
229 ASSERT(conn->security_ix != 0);
231 if (!conn->params.key) {
232 _debug("set up security");
233 ret = rxrpc_init_server_conn_security(conn);
238 abort_code = RX_CALL_DEAD;
241 abort_code = RXKADNOAUTH;
246 if (conn->security->issue_challenge(conn) < 0) {
247 abort_code = RX_CALL_DEAD;
256 _debug("abort %d, %d", ret, abort_code);
257 rxrpc_abort_connection(conn, -ret, abort_code);
258 _leave(" [aborted]");
262 * connection-level event processor
264 void rxrpc_process_connection(struct work_struct *work)
266 struct rxrpc_connection *conn =
267 container_of(work, struct rxrpc_connection, processor);
269 u32 abort_code = RX_PROTOCOL_ERROR;
272 _enter("{%d}", conn->debug_id);
274 if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
275 rxrpc_secure_connection(conn);
277 /* go through the conn-level event packets, releasing the ref on this
278 * connection that each one has when we've finished with it */
279 while ((skb = skb_dequeue(&conn->rx_queue))) {
280 ret = rxrpc_process_event(conn, skb, &abort_code);
287 goto requeue_and_leave;
296 rxrpc_put_connection(conn);
301 skb_queue_head(&conn->rx_queue, skb);
305 if (rxrpc_abort_connection(conn, -ret, abort_code) < 0)
306 goto requeue_and_leave;
313 * put a packet up for transport-level abort
315 void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb)
317 CHECK_SLAB_OKAY(&local->usage);
319 skb_queue_tail(&local->reject_queue, skb);
320 rxrpc_queue_local(local);
324 * reject packets through the local endpoint
326 void rxrpc_reject_packets(struct rxrpc_local *local)
330 struct sockaddr_in sin;
332 struct rxrpc_skb_priv *sp;
333 struct rxrpc_wire_header whdr;
340 _enter("%d", local->debug_id);
342 iov[0].iov_base = &whdr;
343 iov[0].iov_len = sizeof(whdr);
344 iov[1].iov_base = &code;
345 iov[1].iov_len = sizeof(code);
346 size = sizeof(whdr) + sizeof(code);
349 msg.msg_control = NULL;
350 msg.msg_controllen = 0;
353 memset(&sa, 0, sizeof(sa));
354 sa.sa.sa_family = local->srx.transport.family;
355 switch (sa.sa.sa_family) {
357 msg.msg_namelen = sizeof(sa.sin);
364 memset(&whdr, 0, sizeof(whdr));
365 whdr.type = RXRPC_PACKET_TYPE_ABORT;
367 while ((skb = skb_dequeue(&local->reject_queue))) {
369 switch (sa.sa.sa_family) {
371 sa.sin.sin_port = udp_hdr(skb)->source;
372 sa.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
373 code = htonl(skb->priority);
375 whdr.epoch = htonl(sp->hdr.epoch);
376 whdr.cid = htonl(sp->hdr.cid);
377 whdr.callNumber = htonl(sp->hdr.callNumber);
378 whdr.serviceId = htons(sp->hdr.serviceId);
379 whdr.flags = sp->hdr.flags;
380 whdr.flags ^= RXRPC_CLIENT_INITIATED;
381 whdr.flags &= RXRPC_CLIENT_INITIATED;
383 kernel_sendmsg(local->socket, &msg, iov, 2, size);