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David Howells17926a72007-04-26 15:48:28 -07001/* connection-level event handling
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
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.
10 */
11
Joe Perches9b6d5392016-06-02 12:08:52 -070012#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
David Howells17926a72007-04-26 15:48:28 -070014#include <linux/module.h>
15#include <linux/net.h>
16#include <linux/skbuff.h>
17#include <linux/errqueue.h>
18#include <linux/udp.h>
19#include <linux/in.h>
20#include <linux/in6.h>
21#include <linux/icmp.h>
22#include <net/sock.h>
23#include <net/af_rxrpc.h>
24#include <net/ip.h>
25#include "ar-internal.h"
26
27/*
28 * pass a connection-level abort onto all calls on that connection
29 */
30static void rxrpc_abort_calls(struct rxrpc_connection *conn, int state,
31 u32 abort_code)
32{
33 struct rxrpc_call *call;
David Howellsa1399f82016-06-27 14:39:44 +010034 int i;
David Howells17926a72007-04-26 15:48:28 -070035
36 _enter("{%d},%x", conn->debug_id, abort_code);
37
David Howellsa1399f82016-06-27 14:39:44 +010038 spin_lock(&conn->channel_lock);
David Howells17926a72007-04-26 15:48:28 -070039
David Howellsa1399f82016-06-27 14:39:44 +010040 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);
David Howells17926a72007-04-26 15:48:28 -070045 if (call->state <= RXRPC_CALL_COMPLETE) {
46 call->state = state;
David Howellsdc44b3a2016-04-07 17:23:30 +010047 if (state == RXRPC_CALL_LOCALLY_ABORTED) {
48 call->local_abort = conn->local_abort;
David Howells4c198ad2016-03-04 15:53:46 +000049 set_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events);
David Howellsdc44b3a2016-04-07 17:23:30 +010050 } else {
51 call->remote_abort = conn->remote_abort;
David Howells4c198ad2016-03-04 15:53:46 +000052 set_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events);
David Howellsdc44b3a2016-04-07 17:23:30 +010053 }
David Howells651350d2007-04-26 15:50:17 -070054 rxrpc_queue_call(call);
David Howells17926a72007-04-26 15:48:28 -070055 }
David Howellsa1399f82016-06-27 14:39:44 +010056 write_unlock_bh(&call->state_lock);
David Howells17926a72007-04-26 15:48:28 -070057 }
58
David Howellsa1399f82016-06-27 14:39:44 +010059 spin_unlock(&conn->channel_lock);
David Howells17926a72007-04-26 15:48:28 -070060 _leave("");
61}
62
63/*
64 * generate a connection-level abort
65 */
66static int rxrpc_abort_connection(struct rxrpc_connection *conn,
67 u32 error, u32 abort_code)
68{
David Howells0d12f8a2016-03-04 15:53:46 +000069 struct rxrpc_wire_header whdr;
David Howells17926a72007-04-26 15:48:28 -070070 struct msghdr msg;
71 struct kvec iov[2];
72 __be32 word;
73 size_t len;
David Howells0d12f8a2016-03-04 15:53:46 +000074 u32 serial;
David Howells17926a72007-04-26 15:48:28 -070075 int ret;
76
77 _enter("%d,,%u,%u", conn->debug_id, error, abort_code);
78
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;
83 conn->error = error;
84 spin_unlock_bh(&conn->state_lock);
85 } else {
86 spin_unlock_bh(&conn->state_lock);
87 _leave(" = 0 [already dead]");
88 return 0;
89 }
90
91 rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code);
92
David Howells85f32272016-04-04 14:00:36 +010093 msg.msg_name = &conn->params.peer->srx.transport;
94 msg.msg_namelen = conn->params.peer->srx.transport_len;
David Howells17926a72007-04-26 15:48:28 -070095 msg.msg_control = NULL;
96 msg.msg_controllen = 0;
97 msg.msg_flags = 0;
98
David Howells19ffa012016-04-04 14:00:36 +010099 whdr.epoch = htonl(conn->proto.epoch);
100 whdr.cid = htonl(conn->proto.cid);
David Howells0d12f8a2016-03-04 15:53:46 +0000101 whdr.callNumber = 0;
102 whdr.seq = 0;
103 whdr.type = RXRPC_PACKET_TYPE_ABORT;
104 whdr.flags = conn->out_clientflag;
105 whdr.userStatus = 0;
106 whdr.securityIndex = conn->security_ix;
107 whdr._rsvd = 0;
David Howells19ffa012016-04-04 14:00:36 +0100108 whdr.serviceId = htons(conn->params.service_id);
David Howells17926a72007-04-26 15:48:28 -0700109
David Howellsdc44b3a2016-04-07 17:23:30 +0100110 word = htonl(conn->local_abort);
David Howells17926a72007-04-26 15:48:28 -0700111
David Howells0d12f8a2016-03-04 15:53:46 +0000112 iov[0].iov_base = &whdr;
113 iov[0].iov_len = sizeof(whdr);
David Howells17926a72007-04-26 15:48:28 -0700114 iov[1].iov_base = &word;
115 iov[1].iov_len = sizeof(word);
116
117 len = iov[0].iov_len + iov[1].iov_len;
118
David Howells0d12f8a2016-03-04 15:53:46 +0000119 serial = atomic_inc_return(&conn->serial);
120 whdr.serial = htonl(serial);
David Howellsdc44b3a2016-04-07 17:23:30 +0100121 _proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort);
David Howells17926a72007-04-26 15:48:28 -0700122
David Howells85f32272016-04-04 14:00:36 +0100123 ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
David Howells17926a72007-04-26 15:48:28 -0700124 if (ret < 0) {
125 _debug("sendmsg failed: %d", ret);
126 return -EAGAIN;
127 }
128
129 _leave(" = 0");
130 return 0;
131}
132
133/*
134 * mark a call as being on a now-secured channel
135 * - must be called with softirqs disabled
136 */
Roel Kluin5eaa65b2008-12-10 15:18:31 -0800137static void rxrpc_call_is_secure(struct rxrpc_call *call)
David Howells17926a72007-04-26 15:48:28 -0700138{
139 _enter("%p", call);
140 if (call) {
141 read_lock(&call->state_lock);
142 if (call->state < RXRPC_CALL_COMPLETE &&
David Howells4c198ad2016-03-04 15:53:46 +0000143 !test_and_set_bit(RXRPC_CALL_EV_SECURED, &call->events))
David Howells651350d2007-04-26 15:50:17 -0700144 rxrpc_queue_call(call);
David Howells17926a72007-04-26 15:48:28 -0700145 read_unlock(&call->state_lock);
146 }
147}
148
149/*
150 * connection-level Rx packet processor
151 */
152static int rxrpc_process_event(struct rxrpc_connection *conn,
153 struct sk_buff *skb,
154 u32 *_abort_code)
155{
156 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
David Howells0d12f8a2016-03-04 15:53:46 +0000157 __be32 wtmp;
158 u32 abort_code;
David Howells17926a72007-04-26 15:48:28 -0700159 int loop, ret;
160
David Howells519d2562009-06-16 21:36:44 +0100161 if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
162 kleave(" = -ECONNABORTED [%u]", conn->state);
David Howells17926a72007-04-26 15:48:28 -0700163 return -ECONNABORTED;
David Howells519d2562009-06-16 21:36:44 +0100164 }
David Howells17926a72007-04-26 15:48:28 -0700165
David Howells0d12f8a2016-03-04 15:53:46 +0000166 _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);
David Howells519d2562009-06-16 21:36:44 +0100167
David Howells17926a72007-04-26 15:48:28 -0700168 switch (sp->hdr.type) {
169 case RXRPC_PACKET_TYPE_ABORT:
David Howells0d12f8a2016-03-04 15:53:46 +0000170 if (skb_copy_bits(skb, 0, &wtmp, sizeof(wtmp)) < 0)
David Howells17926a72007-04-26 15:48:28 -0700171 return -EPROTO;
David Howells0d12f8a2016-03-04 15:53:46 +0000172 abort_code = ntohl(wtmp);
173 _proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
David Howells17926a72007-04-26 15:48:28 -0700174
175 conn->state = RXRPC_CONN_REMOTELY_ABORTED;
176 rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
David Howells0d12f8a2016-03-04 15:53:46 +0000177 abort_code);
David Howells17926a72007-04-26 15:48:28 -0700178 return -ECONNABORTED;
179
180 case RXRPC_PACKET_TYPE_CHALLENGE:
David Howellse0e4d822016-04-07 17:23:58 +0100181 return conn->security->respond_to_challenge(conn, skb,
182 _abort_code);
David Howells17926a72007-04-26 15:48:28 -0700183
184 case RXRPC_PACKET_TYPE_RESPONSE:
David Howells17926a72007-04-26 15:48:28 -0700185 ret = conn->security->verify_response(conn, skb, _abort_code);
186 if (ret < 0)
187 return ret;
188
189 ret = conn->security->init_connection_security(conn);
190 if (ret < 0)
191 return ret;
192
Herbert Xua2636292016-06-26 14:55:24 -0700193 ret = conn->security->prime_packet_security(conn);
194 if (ret < 0)
195 return ret;
196
David Howellsa1399f82016-06-27 14:39:44 +0100197 spin_lock(&conn->channel_lock);
David Howells17926a72007-04-26 15:48:28 -0700198 spin_lock(&conn->state_lock);
199
David Howellsbba304d2016-06-27 10:32:02 +0100200 if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) {
201 conn->state = RXRPC_CONN_SERVICE;
David Howells17926a72007-04-26 15:48:28 -0700202 for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
David Howellsdee46362016-06-27 17:11:19 +0100203 rxrpc_call_is_secure(
204 rcu_dereference_protected(
David Howellsa1399f82016-06-27 14:39:44 +0100205 conn->channels[loop].call,
206 lockdep_is_held(&conn->channel_lock)));
David Howells17926a72007-04-26 15:48:28 -0700207 }
208
209 spin_unlock(&conn->state_lock);
David Howellsa1399f82016-06-27 14:39:44 +0100210 spin_unlock(&conn->channel_lock);
David Howells17926a72007-04-26 15:48:28 -0700211 return 0;
212
213 default:
David Howells519d2562009-06-16 21:36:44 +0100214 _leave(" = -EPROTO [%u]", sp->hdr.type);
David Howells17926a72007-04-26 15:48:28 -0700215 return -EPROTO;
216 }
217}
218
219/*
220 * set up security and issue a challenge
221 */
222static void rxrpc_secure_connection(struct rxrpc_connection *conn)
223{
224 u32 abort_code;
225 int ret;
226
227 _enter("{%d}", conn->debug_id);
228
229 ASSERT(conn->security_ix != 0);
230
David Howells19ffa012016-04-04 14:00:36 +0100231 if (!conn->params.key) {
David Howells17926a72007-04-26 15:48:28 -0700232 _debug("set up security");
233 ret = rxrpc_init_server_conn_security(conn);
234 switch (ret) {
235 case 0:
236 break;
237 case -ENOENT:
238 abort_code = RX_CALL_DEAD;
239 goto abort;
240 default:
241 abort_code = RXKADNOAUTH;
242 goto abort;
243 }
244 }
245
David Howells17926a72007-04-26 15:48:28 -0700246 if (conn->security->issue_challenge(conn) < 0) {
247 abort_code = RX_CALL_DEAD;
248 ret = -ENOMEM;
249 goto abort;
250 }
251
252 _leave("");
253 return;
254
255abort:
256 _debug("abort %d, %d", ret, abort_code);
257 rxrpc_abort_connection(conn, -ret, abort_code);
258 _leave(" [aborted]");
259}
260
261/*
262 * connection-level event processor
263 */
264void rxrpc_process_connection(struct work_struct *work)
265{
266 struct rxrpc_connection *conn =
267 container_of(work, struct rxrpc_connection, processor);
David Howells17926a72007-04-26 15:48:28 -0700268 struct sk_buff *skb;
269 u32 abort_code = RX_PROTOCOL_ERROR;
270 int ret;
271
272 _enter("{%d}", conn->debug_id);
273
David Howells2c4579e2016-06-27 10:32:03 +0100274 if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
David Howells17926a72007-04-26 15:48:28 -0700275 rxrpc_secure_connection(conn);
David Howells17926a72007-04-26 15:48:28 -0700276
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))) {
David Howells17926a72007-04-26 15:48:28 -0700280 ret = rxrpc_process_event(conn, skb, &abort_code);
281 switch (ret) {
282 case -EPROTO:
283 case -EKEYEXPIRED:
284 case -EKEYREJECTED:
285 goto protocol_error;
286 case -EAGAIN:
287 goto requeue_and_leave;
288 case -ECONNABORTED:
289 default:
David Howells17926a72007-04-26 15:48:28 -0700290 rxrpc_free_skb(skb);
291 break;
292 }
293 }
294
295out:
296 rxrpc_put_connection(conn);
297 _leave("");
298 return;
299
300requeue_and_leave:
301 skb_queue_head(&conn->rx_queue, skb);
302 goto out;
303
304protocol_error:
305 if (rxrpc_abort_connection(conn, -ret, abort_code) < 0)
306 goto requeue_and_leave;
David Howells17926a72007-04-26 15:48:28 -0700307 rxrpc_free_skb(skb);
308 _leave(" [EPROTO]");
309 goto out;
310}
311
312/*
David Howells651350d2007-04-26 15:50:17 -0700313 * put a packet up for transport-level abort
314 */
315void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb)
316{
317 CHECK_SLAB_OKAY(&local->usage);
318
David Howells651350d2007-04-26 15:50:17 -0700319 skb_queue_tail(&local->reject_queue, skb);
David Howells5acbee42016-06-27 10:32:02 +0100320 rxrpc_queue_local(local);
David Howells651350d2007-04-26 15:50:17 -0700321}
322
323/*
David Howells17926a72007-04-26 15:48:28 -0700324 * reject packets through the local endpoint
325 */
David Howells4f95dd72016-04-04 14:00:35 +0100326void rxrpc_reject_packets(struct rxrpc_local *local)
David Howells17926a72007-04-26 15:48:28 -0700327{
328 union {
329 struct sockaddr sa;
330 struct sockaddr_in sin;
331 } sa;
332 struct rxrpc_skb_priv *sp;
David Howells0d12f8a2016-03-04 15:53:46 +0000333 struct rxrpc_wire_header whdr;
David Howells17926a72007-04-26 15:48:28 -0700334 struct sk_buff *skb;
335 struct msghdr msg;
336 struct kvec iov[2];
337 size_t size;
338 __be32 code;
339
David Howells17926a72007-04-26 15:48:28 -0700340 _enter("%d", local->debug_id);
341
David Howells0d12f8a2016-03-04 15:53:46 +0000342 iov[0].iov_base = &whdr;
343 iov[0].iov_len = sizeof(whdr);
David Howells17926a72007-04-26 15:48:28 -0700344 iov[1].iov_base = &code;
345 iov[1].iov_len = sizeof(code);
David Howells0d12f8a2016-03-04 15:53:46 +0000346 size = sizeof(whdr) + sizeof(code);
David Howells17926a72007-04-26 15:48:28 -0700347
348 msg.msg_name = &sa;
349 msg.msg_control = NULL;
350 msg.msg_controllen = 0;
351 msg.msg_flags = 0;
352
353 memset(&sa, 0, sizeof(sa));
354 sa.sa.sa_family = local->srx.transport.family;
355 switch (sa.sa.sa_family) {
356 case AF_INET:
357 msg.msg_namelen = sizeof(sa.sin);
358 break;
359 default:
360 msg.msg_namelen = 0;
361 break;
362 }
363
David Howells0d12f8a2016-03-04 15:53:46 +0000364 memset(&whdr, 0, sizeof(whdr));
365 whdr.type = RXRPC_PACKET_TYPE_ABORT;
David Howells17926a72007-04-26 15:48:28 -0700366
367 while ((skb = skb_dequeue(&local->reject_queue))) {
368 sp = rxrpc_skb(skb);
369 switch (sa.sa.sa_family) {
370 case AF_INET:
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);
374
David Howells0d12f8a2016-03-04 15:53:46 +0000375 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;
David Howells17926a72007-04-26 15:48:28 -0700382
383 kernel_sendmsg(local->socket, &msg, iov, 2, size);
384 break;
385
386 default:
387 break;
388 }
389
390 rxrpc_free_skb(skb);
David Howells17926a72007-04-26 15:48:28 -0700391 }
392
David Howells17926a72007-04-26 15:48:28 -0700393 _leave("");
394}