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 | ||
9b6d5398 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
17926a79 DH |
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> | |
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 | */ | |
30 | static void rxrpc_abort_calls(struct rxrpc_connection *conn, int state, | |
31 | u32 abort_code) | |
32 | { | |
33 | struct rxrpc_call *call; | |
34 | struct rb_node *p; | |
35 | ||
36 | _enter("{%d},%x", conn->debug_id, abort_code); | |
37 | ||
38 | read_lock_bh(&conn->lock); | |
39 | ||
40 | for (p = rb_first(&conn->calls); p; p = rb_next(p)) { | |
41 | call = rb_entry(p, struct rxrpc_call, conn_node); | |
42 | write_lock(&call->state_lock); | |
43 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
44 | call->state = state; | |
dc44b3a0 DH |
45 | if (state == RXRPC_CALL_LOCALLY_ABORTED) { |
46 | call->local_abort = conn->local_abort; | |
4c198ad1 | 47 | set_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events); |
dc44b3a0 DH |
48 | } else { |
49 | call->remote_abort = conn->remote_abort; | |
4c198ad1 | 50 | set_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events); |
dc44b3a0 | 51 | } |
651350d1 | 52 | rxrpc_queue_call(call); |
17926a79 DH |
53 | } |
54 | write_unlock(&call->state_lock); | |
55 | } | |
56 | ||
57 | read_unlock_bh(&conn->lock); | |
58 | _leave(""); | |
59 | } | |
60 | ||
61 | /* | |
62 | * generate a connection-level abort | |
63 | */ | |
64 | static int rxrpc_abort_connection(struct rxrpc_connection *conn, | |
65 | u32 error, u32 abort_code) | |
66 | { | |
0d12f8a4 | 67 | struct rxrpc_wire_header whdr; |
17926a79 DH |
68 | struct msghdr msg; |
69 | struct kvec iov[2]; | |
70 | __be32 word; | |
71 | size_t len; | |
0d12f8a4 | 72 | u32 serial; |
17926a79 DH |
73 | int ret; |
74 | ||
75 | _enter("%d,,%u,%u", conn->debug_id, error, abort_code); | |
76 | ||
77 | /* generate a connection-level abort */ | |
78 | spin_lock_bh(&conn->state_lock); | |
79 | if (conn->state < RXRPC_CONN_REMOTELY_ABORTED) { | |
80 | conn->state = RXRPC_CONN_LOCALLY_ABORTED; | |
81 | conn->error = error; | |
82 | spin_unlock_bh(&conn->state_lock); | |
83 | } else { | |
84 | spin_unlock_bh(&conn->state_lock); | |
85 | _leave(" = 0 [already dead]"); | |
86 | return 0; | |
87 | } | |
88 | ||
89 | rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code); | |
90 | ||
6dd050f8 DH |
91 | msg.msg_name = &conn->trans->peer->srx.transport; |
92 | msg.msg_namelen = conn->trans->peer->srx.transport_len; | |
17926a79 DH |
93 | msg.msg_control = NULL; |
94 | msg.msg_controllen = 0; | |
95 | msg.msg_flags = 0; | |
96 | ||
0d12f8a4 DH |
97 | whdr.epoch = htonl(conn->epoch); |
98 | whdr.cid = htonl(conn->cid); | |
99 | whdr.callNumber = 0; | |
100 | whdr.seq = 0; | |
101 | whdr.type = RXRPC_PACKET_TYPE_ABORT; | |
102 | whdr.flags = conn->out_clientflag; | |
103 | whdr.userStatus = 0; | |
104 | whdr.securityIndex = conn->security_ix; | |
105 | whdr._rsvd = 0; | |
106 | whdr.serviceId = htons(conn->service_id); | |
17926a79 | 107 | |
dc44b3a0 | 108 | word = htonl(conn->local_abort); |
17926a79 | 109 | |
0d12f8a4 DH |
110 | iov[0].iov_base = &whdr; |
111 | iov[0].iov_len = sizeof(whdr); | |
17926a79 DH |
112 | iov[1].iov_base = &word; |
113 | iov[1].iov_len = sizeof(word); | |
114 | ||
115 | len = iov[0].iov_len + iov[1].iov_len; | |
116 | ||
0d12f8a4 DH |
117 | serial = atomic_inc_return(&conn->serial); |
118 | whdr.serial = htonl(serial); | |
dc44b3a0 | 119 | _proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort); |
17926a79 DH |
120 | |
121 | ret = kernel_sendmsg(conn->trans->local->socket, &msg, iov, 2, len); | |
122 | if (ret < 0) { | |
123 | _debug("sendmsg failed: %d", ret); | |
124 | return -EAGAIN; | |
125 | } | |
126 | ||
127 | _leave(" = 0"); | |
128 | return 0; | |
129 | } | |
130 | ||
131 | /* | |
132 | * mark a call as being on a now-secured channel | |
133 | * - must be called with softirqs disabled | |
134 | */ | |
5eaa65b2 | 135 | static void rxrpc_call_is_secure(struct rxrpc_call *call) |
17926a79 DH |
136 | { |
137 | _enter("%p", call); | |
138 | if (call) { | |
139 | read_lock(&call->state_lock); | |
140 | if (call->state < RXRPC_CALL_COMPLETE && | |
4c198ad1 | 141 | !test_and_set_bit(RXRPC_CALL_EV_SECURED, &call->events)) |
651350d1 | 142 | rxrpc_queue_call(call); |
17926a79 DH |
143 | read_unlock(&call->state_lock); |
144 | } | |
145 | } | |
146 | ||
147 | /* | |
148 | * connection-level Rx packet processor | |
149 | */ | |
150 | static int rxrpc_process_event(struct rxrpc_connection *conn, | |
151 | struct sk_buff *skb, | |
152 | u32 *_abort_code) | |
153 | { | |
154 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
0d12f8a4 DH |
155 | __be32 wtmp; |
156 | u32 abort_code; | |
17926a79 DH |
157 | int loop, ret; |
158 | ||
519d2567 DH |
159 | if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) { |
160 | kleave(" = -ECONNABORTED [%u]", conn->state); | |
17926a79 | 161 | return -ECONNABORTED; |
519d2567 | 162 | } |
17926a79 | 163 | |
0d12f8a4 | 164 | _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial); |
519d2567 | 165 | |
17926a79 DH |
166 | switch (sp->hdr.type) { |
167 | case RXRPC_PACKET_TYPE_ABORT: | |
0d12f8a4 | 168 | if (skb_copy_bits(skb, 0, &wtmp, sizeof(wtmp)) < 0) |
17926a79 | 169 | return -EPROTO; |
0d12f8a4 DH |
170 | abort_code = ntohl(wtmp); |
171 | _proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code); | |
17926a79 DH |
172 | |
173 | conn->state = RXRPC_CONN_REMOTELY_ABORTED; | |
174 | rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED, | |
0d12f8a4 | 175 | abort_code); |
17926a79 DH |
176 | return -ECONNABORTED; |
177 | ||
178 | case RXRPC_PACKET_TYPE_CHALLENGE: | |
e0e4d82f DH |
179 | return conn->security->respond_to_challenge(conn, skb, |
180 | _abort_code); | |
17926a79 DH |
181 | |
182 | case RXRPC_PACKET_TYPE_RESPONSE: | |
17926a79 DH |
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 | ||
17926a79 DH |
238 | if (conn->security->issue_challenge(conn) < 0) { |
239 | abort_code = RX_CALL_DEAD; | |
240 | ret = -ENOMEM; | |
241 | goto abort; | |
242 | } | |
243 | ||
244 | _leave(""); | |
245 | return; | |
246 | ||
247 | abort: | |
248 | _debug("abort %d, %d", ret, abort_code); | |
249 | rxrpc_abort_connection(conn, -ret, abort_code); | |
250 | _leave(" [aborted]"); | |
251 | } | |
252 | ||
253 | /* | |
254 | * connection-level event processor | |
255 | */ | |
256 | void rxrpc_process_connection(struct work_struct *work) | |
257 | { | |
258 | struct rxrpc_connection *conn = | |
259 | container_of(work, struct rxrpc_connection, processor); | |
17926a79 DH |
260 | struct sk_buff *skb; |
261 | u32 abort_code = RX_PROTOCOL_ERROR; | |
262 | int ret; | |
263 | ||
264 | _enter("{%d}", conn->debug_id); | |
265 | ||
266 | atomic_inc(&conn->usage); | |
267 | ||
268 | if (test_and_clear_bit(RXRPC_CONN_CHALLENGE, &conn->events)) { | |
269 | rxrpc_secure_connection(conn); | |
270 | rxrpc_put_connection(conn); | |
271 | } | |
272 | ||
273 | /* go through the conn-level event packets, releasing the ref on this | |
274 | * connection that each one has when we've finished with it */ | |
275 | while ((skb = skb_dequeue(&conn->rx_queue))) { | |
17926a79 DH |
276 | ret = rxrpc_process_event(conn, skb, &abort_code); |
277 | switch (ret) { | |
278 | case -EPROTO: | |
279 | case -EKEYEXPIRED: | |
280 | case -EKEYREJECTED: | |
281 | goto protocol_error; | |
282 | case -EAGAIN: | |
283 | goto requeue_and_leave; | |
284 | case -ECONNABORTED: | |
285 | default: | |
286 | rxrpc_put_connection(conn); | |
287 | rxrpc_free_skb(skb); | |
288 | break; | |
289 | } | |
290 | } | |
291 | ||
292 | out: | |
293 | rxrpc_put_connection(conn); | |
294 | _leave(""); | |
295 | return; | |
296 | ||
297 | requeue_and_leave: | |
298 | skb_queue_head(&conn->rx_queue, skb); | |
299 | goto out; | |
300 | ||
301 | protocol_error: | |
302 | if (rxrpc_abort_connection(conn, -ret, abort_code) < 0) | |
303 | goto requeue_and_leave; | |
304 | rxrpc_put_connection(conn); | |
305 | rxrpc_free_skb(skb); | |
306 | _leave(" [EPROTO]"); | |
307 | goto out; | |
308 | } | |
309 | ||
651350d1 DH |
310 | /* |
311 | * put a packet up for transport-level abort | |
312 | */ | |
313 | void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb) | |
314 | { | |
315 | CHECK_SLAB_OKAY(&local->usage); | |
316 | ||
651350d1 | 317 | skb_queue_tail(&local->reject_queue, skb); |
4f95dd78 | 318 | rxrpc_queue_work(&local->processor); |
651350d1 DH |
319 | } |
320 | ||
17926a79 DH |
321 | /* |
322 | * reject packets through the local endpoint | |
323 | */ | |
4f95dd78 | 324 | void rxrpc_reject_packets(struct rxrpc_local *local) |
17926a79 DH |
325 | { |
326 | union { | |
327 | struct sockaddr sa; | |
328 | struct sockaddr_in sin; | |
329 | } sa; | |
330 | struct rxrpc_skb_priv *sp; | |
0d12f8a4 | 331 | struct rxrpc_wire_header whdr; |
17926a79 DH |
332 | struct sk_buff *skb; |
333 | struct msghdr msg; | |
334 | struct kvec iov[2]; | |
335 | size_t size; | |
336 | __be32 code; | |
337 | ||
17926a79 DH |
338 | _enter("%d", local->debug_id); |
339 | ||
0d12f8a4 DH |
340 | iov[0].iov_base = &whdr; |
341 | iov[0].iov_len = sizeof(whdr); | |
17926a79 DH |
342 | iov[1].iov_base = &code; |
343 | iov[1].iov_len = sizeof(code); | |
0d12f8a4 | 344 | size = sizeof(whdr) + sizeof(code); |
17926a79 DH |
345 | |
346 | msg.msg_name = &sa; | |
347 | msg.msg_control = NULL; | |
348 | msg.msg_controllen = 0; | |
349 | msg.msg_flags = 0; | |
350 | ||
351 | memset(&sa, 0, sizeof(sa)); | |
352 | sa.sa.sa_family = local->srx.transport.family; | |
353 | switch (sa.sa.sa_family) { | |
354 | case AF_INET: | |
355 | msg.msg_namelen = sizeof(sa.sin); | |
356 | break; | |
357 | default: | |
358 | msg.msg_namelen = 0; | |
359 | break; | |
360 | } | |
361 | ||
0d12f8a4 DH |
362 | memset(&whdr, 0, sizeof(whdr)); |
363 | whdr.type = RXRPC_PACKET_TYPE_ABORT; | |
17926a79 DH |
364 | |
365 | while ((skb = skb_dequeue(&local->reject_queue))) { | |
366 | sp = rxrpc_skb(skb); | |
367 | switch (sa.sa.sa_family) { | |
368 | case AF_INET: | |
369 | sa.sin.sin_port = udp_hdr(skb)->source; | |
370 | sa.sin.sin_addr.s_addr = ip_hdr(skb)->saddr; | |
371 | code = htonl(skb->priority); | |
372 | ||
0d12f8a4 DH |
373 | whdr.epoch = htonl(sp->hdr.epoch); |
374 | whdr.cid = htonl(sp->hdr.cid); | |
375 | whdr.callNumber = htonl(sp->hdr.callNumber); | |
376 | whdr.serviceId = htons(sp->hdr.serviceId); | |
377 | whdr.flags = sp->hdr.flags; | |
378 | whdr.flags ^= RXRPC_CLIENT_INITIATED; | |
379 | whdr.flags &= RXRPC_CLIENT_INITIATED; | |
17926a79 DH |
380 | |
381 | kernel_sendmsg(local->socket, &msg, iov, 2, size); | |
382 | break; | |
383 | ||
384 | default: | |
385 | break; | |
386 | } | |
387 | ||
388 | rxrpc_free_skb(skb); | |
17926a79 DH |
389 | } |
390 | ||
17926a79 DH |
391 | _leave(""); |
392 | } |