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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) | |
45 | set_bit(RXRPC_CALL_CONN_ABORT, &call->events); | |
46 | else | |
47 | set_bit(RXRPC_CALL_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 | { | |
63 | struct rxrpc_header hdr; | |
64 | struct msghdr msg; | |
65 | struct kvec iov[2]; | |
66 | __be32 word; | |
67 | size_t len; | |
68 | int ret; | |
69 | ||
70 | _enter("%d,,%u,%u", conn->debug_id, error, abort_code); | |
71 | ||
72 | /* generate a connection-level abort */ | |
73 | spin_lock_bh(&conn->state_lock); | |
74 | if (conn->state < RXRPC_CONN_REMOTELY_ABORTED) { | |
75 | conn->state = RXRPC_CONN_LOCALLY_ABORTED; | |
76 | conn->error = error; | |
77 | spin_unlock_bh(&conn->state_lock); | |
78 | } else { | |
79 | spin_unlock_bh(&conn->state_lock); | |
80 | _leave(" = 0 [already dead]"); | |
81 | return 0; | |
82 | } | |
83 | ||
84 | rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code); | |
85 | ||
86 | msg.msg_name = &conn->trans->peer->srx.transport.sin; | |
87 | msg.msg_namelen = sizeof(conn->trans->peer->srx.transport.sin); | |
88 | msg.msg_control = NULL; | |
89 | msg.msg_controllen = 0; | |
90 | msg.msg_flags = 0; | |
91 | ||
92 | hdr.epoch = conn->epoch; | |
93 | hdr.cid = conn->cid; | |
94 | hdr.callNumber = 0; | |
95 | hdr.seq = 0; | |
96 | hdr.type = RXRPC_PACKET_TYPE_ABORT; | |
97 | hdr.flags = conn->out_clientflag; | |
98 | hdr.userStatus = 0; | |
99 | hdr.securityIndex = conn->security_ix; | |
100 | hdr._rsvd = 0; | |
101 | hdr.serviceId = conn->service_id; | |
102 | ||
103 | word = htonl(abort_code); | |
104 | ||
105 | iov[0].iov_base = &hdr; | |
106 | iov[0].iov_len = sizeof(hdr); | |
107 | iov[1].iov_base = &word; | |
108 | iov[1].iov_len = sizeof(word); | |
109 | ||
110 | len = iov[0].iov_len + iov[1].iov_len; | |
111 | ||
112 | hdr.serial = htonl(atomic_inc_return(&conn->serial)); | |
113 | _proto("Tx CONN ABORT %%%u { %d }", ntohl(hdr.serial), abort_code); | |
114 | ||
115 | ret = kernel_sendmsg(conn->trans->local->socket, &msg, iov, 2, len); | |
116 | if (ret < 0) { | |
117 | _debug("sendmsg failed: %d", ret); | |
118 | return -EAGAIN; | |
119 | } | |
120 | ||
121 | _leave(" = 0"); | |
122 | return 0; | |
123 | } | |
124 | ||
125 | /* | |
126 | * mark a call as being on a now-secured channel | |
127 | * - must be called with softirqs disabled | |
128 | */ | |
5eaa65b2 | 129 | static void rxrpc_call_is_secure(struct rxrpc_call *call) |
17926a79 DH |
130 | { |
131 | _enter("%p", call); | |
132 | if (call) { | |
133 | read_lock(&call->state_lock); | |
134 | if (call->state < RXRPC_CALL_COMPLETE && | |
135 | !test_and_set_bit(RXRPC_CALL_SECURED, &call->events)) | |
651350d1 | 136 | rxrpc_queue_call(call); |
17926a79 DH |
137 | read_unlock(&call->state_lock); |
138 | } | |
139 | } | |
140 | ||
141 | /* | |
142 | * connection-level Rx packet processor | |
143 | */ | |
144 | static int rxrpc_process_event(struct rxrpc_connection *conn, | |
145 | struct sk_buff *skb, | |
146 | u32 *_abort_code) | |
147 | { | |
148 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
149 | __be32 tmp; | |
150 | u32 serial; | |
151 | int loop, ret; | |
152 | ||
519d2567 DH |
153 | if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) { |
154 | kleave(" = -ECONNABORTED [%u]", conn->state); | |
17926a79 | 155 | return -ECONNABORTED; |
519d2567 | 156 | } |
17926a79 DH |
157 | |
158 | serial = ntohl(sp->hdr.serial); | |
159 | ||
519d2567 DH |
160 | _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, serial); |
161 | ||
17926a79 DH |
162 | switch (sp->hdr.type) { |
163 | case RXRPC_PACKET_TYPE_ABORT: | |
164 | if (skb_copy_bits(skb, 0, &tmp, sizeof(tmp)) < 0) | |
165 | return -EPROTO; | |
166 | _proto("Rx ABORT %%%u { ac=%d }", serial, ntohl(tmp)); | |
167 | ||
168 | conn->state = RXRPC_CONN_REMOTELY_ABORTED; | |
169 | rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED, | |
170 | ntohl(tmp)); | |
171 | return -ECONNABORTED; | |
172 | ||
173 | case RXRPC_PACKET_TYPE_CHALLENGE: | |
174 | if (conn->security) | |
175 | return conn->security->respond_to_challenge( | |
176 | conn, skb, _abort_code); | |
177 | return -EPROTO; | |
178 | ||
179 | case RXRPC_PACKET_TYPE_RESPONSE: | |
180 | if (!conn->security) | |
181 | return -EPROTO; | |
182 | ||
183 | ret = conn->security->verify_response(conn, skb, _abort_code); | |
184 | if (ret < 0) | |
185 | return ret; | |
186 | ||
187 | ret = conn->security->init_connection_security(conn); | |
188 | if (ret < 0) | |
189 | return ret; | |
190 | ||
191 | conn->security->prime_packet_security(conn); | |
192 | read_lock_bh(&conn->lock); | |
193 | spin_lock(&conn->state_lock); | |
194 | ||
195 | if (conn->state == RXRPC_CONN_SERVER_CHALLENGING) { | |
196 | conn->state = RXRPC_CONN_SERVER; | |
197 | for (loop = 0; loop < RXRPC_MAXCALLS; loop++) | |
198 | rxrpc_call_is_secure(conn->channels[loop]); | |
199 | } | |
200 | ||
201 | spin_unlock(&conn->state_lock); | |
202 | read_unlock_bh(&conn->lock); | |
203 | return 0; | |
204 | ||
205 | default: | |
519d2567 | 206 | _leave(" = -EPROTO [%u]", sp->hdr.type); |
17926a79 DH |
207 | return -EPROTO; |
208 | } | |
209 | } | |
210 | ||
211 | /* | |
212 | * set up security and issue a challenge | |
213 | */ | |
214 | static void rxrpc_secure_connection(struct rxrpc_connection *conn) | |
215 | { | |
216 | u32 abort_code; | |
217 | int ret; | |
218 | ||
219 | _enter("{%d}", conn->debug_id); | |
220 | ||
221 | ASSERT(conn->security_ix != 0); | |
222 | ||
223 | if (!conn->key) { | |
224 | _debug("set up security"); | |
225 | ret = rxrpc_init_server_conn_security(conn); | |
226 | switch (ret) { | |
227 | case 0: | |
228 | break; | |
229 | case -ENOENT: | |
230 | abort_code = RX_CALL_DEAD; | |
231 | goto abort; | |
232 | default: | |
233 | abort_code = RXKADNOAUTH; | |
234 | goto abort; | |
235 | } | |
236 | } | |
237 | ||
238 | ASSERT(conn->security != NULL); | |
239 | ||
240 | if (conn->security->issue_challenge(conn) < 0) { | |
241 | abort_code = RX_CALL_DEAD; | |
242 | ret = -ENOMEM; | |
243 | goto abort; | |
244 | } | |
245 | ||
246 | _leave(""); | |
247 | return; | |
248 | ||
249 | abort: | |
250 | _debug("abort %d, %d", ret, abort_code); | |
251 | rxrpc_abort_connection(conn, -ret, abort_code); | |
252 | _leave(" [aborted]"); | |
253 | } | |
254 | ||
255 | /* | |
256 | * connection-level event processor | |
257 | */ | |
258 | void rxrpc_process_connection(struct work_struct *work) | |
259 | { | |
260 | struct rxrpc_connection *conn = | |
261 | container_of(work, struct rxrpc_connection, processor); | |
262 | struct rxrpc_skb_priv *sp; | |
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))) { | |
279 | sp = rxrpc_skb(skb); | |
280 | ||
281 | ret = rxrpc_process_event(conn, skb, &abort_code); | |
282 | switch (ret) { | |
283 | case -EPROTO: | |
284 | case -EKEYEXPIRED: | |
285 | case -EKEYREJECTED: | |
286 | goto protocol_error; | |
287 | case -EAGAIN: | |
288 | goto requeue_and_leave; | |
289 | case -ECONNABORTED: | |
290 | default: | |
291 | rxrpc_put_connection(conn); | |
292 | rxrpc_free_skb(skb); | |
293 | break; | |
294 | } | |
295 | } | |
296 | ||
297 | out: | |
298 | rxrpc_put_connection(conn); | |
299 | _leave(""); | |
300 | return; | |
301 | ||
302 | requeue_and_leave: | |
303 | skb_queue_head(&conn->rx_queue, skb); | |
304 | goto out; | |
305 | ||
306 | protocol_error: | |
307 | if (rxrpc_abort_connection(conn, -ret, abort_code) < 0) | |
308 | goto requeue_and_leave; | |
309 | rxrpc_put_connection(conn); | |
310 | rxrpc_free_skb(skb); | |
311 | _leave(" [EPROTO]"); | |
312 | goto out; | |
313 | } | |
314 | ||
651350d1 DH |
315 | /* |
316 | * put a packet up for transport-level abort | |
317 | */ | |
318 | void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb) | |
319 | { | |
320 | CHECK_SLAB_OKAY(&local->usage); | |
321 | ||
322 | if (!atomic_inc_not_zero(&local->usage)) { | |
323 | printk("resurrected on reject\n"); | |
324 | BUG(); | |
325 | } | |
326 | ||
327 | skb_queue_tail(&local->reject_queue, skb); | |
328 | rxrpc_queue_work(&local->rejecter); | |
329 | } | |
330 | ||
17926a79 DH |
331 | /* |
332 | * reject packets through the local endpoint | |
333 | */ | |
334 | void rxrpc_reject_packets(struct work_struct *work) | |
335 | { | |
336 | union { | |
337 | struct sockaddr sa; | |
338 | struct sockaddr_in sin; | |
339 | } sa; | |
340 | struct rxrpc_skb_priv *sp; | |
341 | struct rxrpc_header hdr; | |
342 | struct rxrpc_local *local; | |
343 | struct sk_buff *skb; | |
344 | struct msghdr msg; | |
345 | struct kvec iov[2]; | |
346 | size_t size; | |
347 | __be32 code; | |
348 | ||
349 | local = container_of(work, struct rxrpc_local, rejecter); | |
350 | rxrpc_get_local(local); | |
351 | ||
352 | _enter("%d", local->debug_id); | |
353 | ||
354 | iov[0].iov_base = &hdr; | |
355 | iov[0].iov_len = sizeof(hdr); | |
356 | iov[1].iov_base = &code; | |
357 | iov[1].iov_len = sizeof(code); | |
358 | size = sizeof(hdr) + sizeof(code); | |
359 | ||
360 | msg.msg_name = &sa; | |
361 | msg.msg_control = NULL; | |
362 | msg.msg_controllen = 0; | |
363 | msg.msg_flags = 0; | |
364 | ||
365 | memset(&sa, 0, sizeof(sa)); | |
366 | sa.sa.sa_family = local->srx.transport.family; | |
367 | switch (sa.sa.sa_family) { | |
368 | case AF_INET: | |
369 | msg.msg_namelen = sizeof(sa.sin); | |
370 | break; | |
371 | default: | |
372 | msg.msg_namelen = 0; | |
373 | break; | |
374 | } | |
375 | ||
376 | memset(&hdr, 0, sizeof(hdr)); | |
377 | hdr.type = RXRPC_PACKET_TYPE_ABORT; | |
378 | ||
379 | while ((skb = skb_dequeue(&local->reject_queue))) { | |
380 | sp = rxrpc_skb(skb); | |
381 | switch (sa.sa.sa_family) { | |
382 | case AF_INET: | |
383 | sa.sin.sin_port = udp_hdr(skb)->source; | |
384 | sa.sin.sin_addr.s_addr = ip_hdr(skb)->saddr; | |
385 | code = htonl(skb->priority); | |
386 | ||
387 | hdr.epoch = sp->hdr.epoch; | |
388 | hdr.cid = sp->hdr.cid; | |
389 | hdr.callNumber = sp->hdr.callNumber; | |
390 | hdr.serviceId = sp->hdr.serviceId; | |
391 | hdr.flags = sp->hdr.flags; | |
392 | hdr.flags ^= RXRPC_CLIENT_INITIATED; | |
393 | hdr.flags &= RXRPC_CLIENT_INITIATED; | |
394 | ||
395 | kernel_sendmsg(local->socket, &msg, iov, 2, size); | |
396 | break; | |
397 | ||
398 | default: | |
399 | break; | |
400 | } | |
401 | ||
402 | rxrpc_free_skb(skb); | |
403 | rxrpc_put_local(local); | |
404 | } | |
405 | ||
406 | rxrpc_put_local(local); | |
407 | _leave(""); | |
408 | } |