Commit | Line | Data |
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17926a79 DH |
1 | /* 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 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/net.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/errqueue.h> | |
16 | #include <linux/udp.h> | |
17 | #include <linux/in.h> | |
18 | #include <linux/in6.h> | |
19 | #include <linux/icmp.h> | |
20 | #include <net/sock.h> | |
21 | #include <net/af_rxrpc.h> | |
22 | #include <net/ip.h> | |
23 | #include "ar-internal.h" | |
24 | ||
25 | /* | |
26 | * pass a connection-level abort onto all calls on that connection | |
27 | */ | |
28 | static void rxrpc_abort_calls(struct rxrpc_connection *conn, int state, | |
29 | u32 abort_code) | |
30 | { | |
31 | struct rxrpc_call *call; | |
32 | struct rb_node *p; | |
33 | ||
34 | _enter("{%d},%x", conn->debug_id, abort_code); | |
35 | ||
36 | read_lock_bh(&conn->lock); | |
37 | ||
38 | for (p = rb_first(&conn->calls); p; p = rb_next(p)) { | |
39 | call = rb_entry(p, struct rxrpc_call, conn_node); | |
40 | write_lock(&call->state_lock); | |
41 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
42 | call->state = state; | |
43 | call->abort_code = abort_code; | |
44 | if (state == RXRPC_CALL_LOCALLY_ABORTED) | |
4c198ad1 | 45 | set_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events); |
17926a79 | 46 | else |
4c198ad1 | 47 | set_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events); |
651350d1 | 48 | rxrpc_queue_call(call); |
17926a79 DH |
49 | } |
50 | write_unlock(&call->state_lock); | |
51 | } | |
52 | ||
53 | read_unlock_bh(&conn->lock); | |
54 | _leave(""); | |
55 | } | |
56 | ||
57 | /* | |
58 | * generate a connection-level abort | |
59 | */ | |
60 | static int rxrpc_abort_connection(struct rxrpc_connection *conn, | |
61 | u32 error, u32 abort_code) | |
62 | { | |
0d12f8a4 | 63 | struct rxrpc_wire_header whdr; |
17926a79 DH |
64 | struct msghdr msg; |
65 | struct kvec iov[2]; | |
66 | __be32 word; | |
67 | size_t len; | |
0d12f8a4 | 68 | u32 serial; |
17926a79 DH |
69 | int ret; |
70 | ||
71 | _enter("%d,,%u,%u", conn->debug_id, error, abort_code); | |
72 | ||
73 | /* generate a connection-level abort */ | |
74 | spin_lock_bh(&conn->state_lock); | |
75 | if (conn->state < RXRPC_CONN_REMOTELY_ABORTED) { | |
76 | conn->state = RXRPC_CONN_LOCALLY_ABORTED; | |
77 | conn->error = error; | |
78 | spin_unlock_bh(&conn->state_lock); | |
79 | } else { | |
80 | spin_unlock_bh(&conn->state_lock); | |
81 | _leave(" = 0 [already dead]"); | |
82 | return 0; | |
83 | } | |
84 | ||
85 | rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code); | |
86 | ||
87 | msg.msg_name = &conn->trans->peer->srx.transport.sin; | |
88 | msg.msg_namelen = sizeof(conn->trans->peer->srx.transport.sin); | |
89 | msg.msg_control = NULL; | |
90 | msg.msg_controllen = 0; | |
91 | msg.msg_flags = 0; | |
92 | ||
0d12f8a4 DH |
93 | whdr.epoch = htonl(conn->epoch); |
94 | whdr.cid = htonl(conn->cid); | |
95 | whdr.callNumber = 0; | |
96 | whdr.seq = 0; | |
97 | whdr.type = RXRPC_PACKET_TYPE_ABORT; | |
98 | whdr.flags = conn->out_clientflag; | |
99 | whdr.userStatus = 0; | |
100 | whdr.securityIndex = conn->security_ix; | |
101 | whdr._rsvd = 0; | |
102 | whdr.serviceId = htons(conn->service_id); | |
17926a79 DH |
103 | |
104 | word = htonl(abort_code); | |
105 | ||
0d12f8a4 DH |
106 | iov[0].iov_base = &whdr; |
107 | iov[0].iov_len = sizeof(whdr); | |
17926a79 DH |
108 | iov[1].iov_base = &word; |
109 | iov[1].iov_len = sizeof(word); | |
110 | ||
111 | len = iov[0].iov_len + iov[1].iov_len; | |
112 | ||
0d12f8a4 DH |
113 | serial = atomic_inc_return(&conn->serial); |
114 | whdr.serial = htonl(serial); | |
115 | _proto("Tx CONN ABORT %%%u { %d }", serial, abort_code); | |
17926a79 DH |
116 | |
117 | ret = kernel_sendmsg(conn->trans->local->socket, &msg, iov, 2, len); | |
118 | if (ret < 0) { | |
119 | _debug("sendmsg failed: %d", ret); | |
120 | return -EAGAIN; | |
121 | } | |
122 | ||
123 | _leave(" = 0"); | |
124 | return 0; | |
125 | } | |
126 | ||
127 | /* | |
128 | * mark a call as being on a now-secured channel | |
129 | * - must be called with softirqs disabled | |
130 | */ | |
5eaa65b2 | 131 | static void rxrpc_call_is_secure(struct rxrpc_call *call) |
17926a79 DH |
132 | { |
133 | _enter("%p", call); | |
134 | if (call) { | |
135 | read_lock(&call->state_lock); | |
136 | if (call->state < RXRPC_CALL_COMPLETE && | |
4c198ad1 | 137 | !test_and_set_bit(RXRPC_CALL_EV_SECURED, &call->events)) |
651350d1 | 138 | rxrpc_queue_call(call); |
17926a79 DH |
139 | read_unlock(&call->state_lock); |
140 | } | |
141 | } | |
142 | ||
143 | /* | |
144 | * connection-level Rx packet processor | |
145 | */ | |
146 | static int rxrpc_process_event(struct rxrpc_connection *conn, | |
147 | struct sk_buff *skb, | |
148 | u32 *_abort_code) | |
149 | { | |
150 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
0d12f8a4 DH |
151 | __be32 wtmp; |
152 | u32 abort_code; | |
17926a79 DH |
153 | int loop, ret; |
154 | ||
519d2567 DH |
155 | if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) { |
156 | kleave(" = -ECONNABORTED [%u]", conn->state); | |
17926a79 | 157 | return -ECONNABORTED; |
519d2567 | 158 | } |
17926a79 | 159 | |
0d12f8a4 | 160 | _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial); |
519d2567 | 161 | |
17926a79 DH |
162 | switch (sp->hdr.type) { |
163 | case RXRPC_PACKET_TYPE_ABORT: | |
0d12f8a4 | 164 | if (skb_copy_bits(skb, 0, &wtmp, sizeof(wtmp)) < 0) |
17926a79 | 165 | return -EPROTO; |
0d12f8a4 DH |
166 | abort_code = ntohl(wtmp); |
167 | _proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code); | |
17926a79 DH |
168 | |
169 | conn->state = RXRPC_CONN_REMOTELY_ABORTED; | |
170 | rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED, | |
0d12f8a4 | 171 | abort_code); |
17926a79 DH |
172 | return -ECONNABORTED; |
173 | ||
174 | case RXRPC_PACKET_TYPE_CHALLENGE: | |
175 | if (conn->security) | |
176 | return conn->security->respond_to_challenge( | |
177 | conn, skb, _abort_code); | |
178 | return -EPROTO; | |
179 | ||
180 | case RXRPC_PACKET_TYPE_RESPONSE: | |
181 | if (!conn->security) | |
182 | return -EPROTO; | |
183 | ||
184 | ret = conn->security->verify_response(conn, skb, _abort_code); | |
185 | if (ret < 0) | |
186 | return ret; | |
187 | ||
188 | ret = conn->security->init_connection_security(conn); | |
189 | if (ret < 0) | |
190 | return ret; | |
191 | ||
192 | conn->security->prime_packet_security(conn); | |
193 | read_lock_bh(&conn->lock); | |
194 | spin_lock(&conn->state_lock); | |
195 | ||
196 | if (conn->state == RXRPC_CONN_SERVER_CHALLENGING) { | |
197 | conn->state = RXRPC_CONN_SERVER; | |
198 | for (loop = 0; loop < RXRPC_MAXCALLS; loop++) | |
199 | rxrpc_call_is_secure(conn->channels[loop]); | |
200 | } | |
201 | ||
202 | spin_unlock(&conn->state_lock); | |
203 | read_unlock_bh(&conn->lock); | |
204 | return 0; | |
205 | ||
206 | default: | |
519d2567 | 207 | _leave(" = -EPROTO [%u]", sp->hdr.type); |
17926a79 DH |
208 | return -EPROTO; |
209 | } | |
210 | } | |
211 | ||
212 | /* | |
213 | * set up security and issue a challenge | |
214 | */ | |
215 | static void rxrpc_secure_connection(struct rxrpc_connection *conn) | |
216 | { | |
217 | u32 abort_code; | |
218 | int ret; | |
219 | ||
220 | _enter("{%d}", conn->debug_id); | |
221 | ||
222 | ASSERT(conn->security_ix != 0); | |
223 | ||
224 | if (!conn->key) { | |
225 | _debug("set up security"); | |
226 | ret = rxrpc_init_server_conn_security(conn); | |
227 | switch (ret) { | |
228 | case 0: | |
229 | break; | |
230 | case -ENOENT: | |
231 | abort_code = RX_CALL_DEAD; | |
232 | goto abort; | |
233 | default: | |
234 | abort_code = RXKADNOAUTH; | |
235 | goto abort; | |
236 | } | |
237 | } | |
238 | ||
239 | ASSERT(conn->security != NULL); | |
240 | ||
241 | if (conn->security->issue_challenge(conn) < 0) { | |
242 | abort_code = RX_CALL_DEAD; | |
243 | ret = -ENOMEM; | |
244 | goto abort; | |
245 | } | |
246 | ||
247 | _leave(""); | |
248 | return; | |
249 | ||
250 | abort: | |
251 | _debug("abort %d, %d", ret, abort_code); | |
252 | rxrpc_abort_connection(conn, -ret, abort_code); | |
253 | _leave(" [aborted]"); | |
254 | } | |
255 | ||
256 | /* | |
257 | * connection-level event processor | |
258 | */ | |
259 | void rxrpc_process_connection(struct work_struct *work) | |
260 | { | |
261 | struct rxrpc_connection *conn = | |
262 | container_of(work, struct rxrpc_connection, processor); | |
17926a79 DH |
263 | struct sk_buff *skb; |
264 | u32 abort_code = RX_PROTOCOL_ERROR; | |
265 | int ret; | |
266 | ||
267 | _enter("{%d}", conn->debug_id); | |
268 | ||
269 | atomic_inc(&conn->usage); | |
270 | ||
271 | if (test_and_clear_bit(RXRPC_CONN_CHALLENGE, &conn->events)) { | |
272 | rxrpc_secure_connection(conn); | |
273 | rxrpc_put_connection(conn); | |
274 | } | |
275 | ||
276 | /* go through the conn-level event packets, releasing the ref on this | |
277 | * connection that each one has when we've finished with it */ | |
278 | while ((skb = skb_dequeue(&conn->rx_queue))) { | |
17926a79 DH |
279 | ret = rxrpc_process_event(conn, skb, &abort_code); |
280 | switch (ret) { | |
281 | case -EPROTO: | |
282 | case -EKEYEXPIRED: | |
283 | case -EKEYREJECTED: | |
284 | goto protocol_error; | |
285 | case -EAGAIN: | |
286 | goto requeue_and_leave; | |
287 | case -ECONNABORTED: | |
288 | default: | |
289 | rxrpc_put_connection(conn); | |
290 | rxrpc_free_skb(skb); | |
291 | break; | |
292 | } | |
293 | } | |
294 | ||
295 | out: | |
296 | rxrpc_put_connection(conn); | |
297 | _leave(""); | |
298 | return; | |
299 | ||
300 | requeue_and_leave: | |
301 | skb_queue_head(&conn->rx_queue, skb); | |
302 | goto out; | |
303 | ||
304 | protocol_error: | |
305 | if (rxrpc_abort_connection(conn, -ret, abort_code) < 0) | |
306 | goto requeue_and_leave; | |
307 | rxrpc_put_connection(conn); | |
308 | rxrpc_free_skb(skb); | |
309 | _leave(" [EPROTO]"); | |
310 | goto out; | |
311 | } | |
312 | ||
651350d1 DH |
313 | /* |
314 | * put a packet up for transport-level abort | |
315 | */ | |
316 | void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb) | |
317 | { | |
318 | CHECK_SLAB_OKAY(&local->usage); | |
319 | ||
320 | if (!atomic_inc_not_zero(&local->usage)) { | |
321 | printk("resurrected on reject\n"); | |
322 | BUG(); | |
323 | } | |
324 | ||
325 | skb_queue_tail(&local->reject_queue, skb); | |
326 | rxrpc_queue_work(&local->rejecter); | |
327 | } | |
328 | ||
17926a79 DH |
329 | /* |
330 | * reject packets through the local endpoint | |
331 | */ | |
332 | void rxrpc_reject_packets(struct work_struct *work) | |
333 | { | |
334 | union { | |
335 | struct sockaddr sa; | |
336 | struct sockaddr_in sin; | |
337 | } sa; | |
338 | struct rxrpc_skb_priv *sp; | |
0d12f8a4 | 339 | struct rxrpc_wire_header whdr; |
17926a79 DH |
340 | struct rxrpc_local *local; |
341 | struct sk_buff *skb; | |
342 | struct msghdr msg; | |
343 | struct kvec iov[2]; | |
344 | size_t size; | |
345 | __be32 code; | |
346 | ||
347 | local = container_of(work, struct rxrpc_local, rejecter); | |
348 | rxrpc_get_local(local); | |
349 | ||
350 | _enter("%d", local->debug_id); | |
351 | ||
0d12f8a4 DH |
352 | iov[0].iov_base = &whdr; |
353 | iov[0].iov_len = sizeof(whdr); | |
17926a79 DH |
354 | iov[1].iov_base = &code; |
355 | iov[1].iov_len = sizeof(code); | |
0d12f8a4 | 356 | size = sizeof(whdr) + sizeof(code); |
17926a79 DH |
357 | |
358 | msg.msg_name = &sa; | |
359 | msg.msg_control = NULL; | |
360 | msg.msg_controllen = 0; | |
361 | msg.msg_flags = 0; | |
362 | ||
363 | memset(&sa, 0, sizeof(sa)); | |
364 | sa.sa.sa_family = local->srx.transport.family; | |
365 | switch (sa.sa.sa_family) { | |
366 | case AF_INET: | |
367 | msg.msg_namelen = sizeof(sa.sin); | |
368 | break; | |
369 | default: | |
370 | msg.msg_namelen = 0; | |
371 | break; | |
372 | } | |
373 | ||
0d12f8a4 DH |
374 | memset(&whdr, 0, sizeof(whdr)); |
375 | whdr.type = RXRPC_PACKET_TYPE_ABORT; | |
17926a79 DH |
376 | |
377 | while ((skb = skb_dequeue(&local->reject_queue))) { | |
378 | sp = rxrpc_skb(skb); | |
379 | switch (sa.sa.sa_family) { | |
380 | case AF_INET: | |
381 | sa.sin.sin_port = udp_hdr(skb)->source; | |
382 | sa.sin.sin_addr.s_addr = ip_hdr(skb)->saddr; | |
383 | code = htonl(skb->priority); | |
384 | ||
0d12f8a4 DH |
385 | whdr.epoch = htonl(sp->hdr.epoch); |
386 | whdr.cid = htonl(sp->hdr.cid); | |
387 | whdr.callNumber = htonl(sp->hdr.callNumber); | |
388 | whdr.serviceId = htons(sp->hdr.serviceId); | |
389 | whdr.flags = sp->hdr.flags; | |
390 | whdr.flags ^= RXRPC_CLIENT_INITIATED; | |
391 | whdr.flags &= RXRPC_CLIENT_INITIATED; | |
17926a79 DH |
392 | |
393 | kernel_sendmsg(local->socket, &msg, iov, 2, size); | |
394 | break; | |
395 | ||
396 | default: | |
397 | break; | |
398 | } | |
399 | ||
400 | rxrpc_free_skb(skb); | |
401 | rxrpc_put_local(local); | |
402 | } | |
403 | ||
404 | rxrpc_put_local(local); | |
405 | _leave(""); | |
406 | } |