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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> | |
17926a79 DH |
18 | #include <net/sock.h> |
19 | #include <net/af_rxrpc.h> | |
20 | #include <net/ip.h> | |
21 | #include "ar-internal.h" | |
22 | ||
18bfeba5 DH |
23 | /* |
24 | * Retransmit terminal ACK or ABORT of the previous call. | |
25 | */ | |
f5c17aae DH |
26 | static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, |
27 | struct sk_buff *skb) | |
18bfeba5 DH |
28 | { |
29 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
30 | struct rxrpc_channel *chan; | |
31 | struct msghdr msg; | |
32 | struct kvec iov; | |
33 | struct { | |
34 | struct rxrpc_wire_header whdr; | |
35 | union { | |
36 | struct { | |
37 | __be32 code; | |
38 | } abort; | |
39 | struct { | |
40 | struct rxrpc_ackpacket ack; | |
2266ffde | 41 | u8 padding[3]; |
18bfeba5 DH |
42 | struct rxrpc_ackinfo info; |
43 | }; | |
44 | }; | |
45 | } __attribute__((packed)) pkt; | |
46 | size_t len; | |
47 | u32 serial, mtu, call_id; | |
48 | ||
49 | _enter("%d", conn->debug_id); | |
50 | ||
51 | chan = &conn->channels[sp->hdr.cid & RXRPC_CHANNELMASK]; | |
52 | ||
53 | /* If the last call got moved on whilst we were waiting to run, just | |
54 | * ignore this packet. | |
55 | */ | |
56 | call_id = READ_ONCE(chan->last_call); | |
57 | /* Sync with __rxrpc_disconnect_call() */ | |
58 | smp_rmb(); | |
59 | if (call_id != sp->hdr.callNumber) | |
60 | return; | |
61 | ||
62 | msg.msg_name = &conn->params.peer->srx.transport; | |
63 | msg.msg_namelen = conn->params.peer->srx.transport_len; | |
64 | msg.msg_control = NULL; | |
65 | msg.msg_controllen = 0; | |
66 | msg.msg_flags = 0; | |
67 | ||
68 | pkt.whdr.epoch = htonl(sp->hdr.epoch); | |
69 | pkt.whdr.cid = htonl(sp->hdr.cid); | |
70 | pkt.whdr.callNumber = htonl(sp->hdr.callNumber); | |
71 | pkt.whdr.seq = 0; | |
72 | pkt.whdr.type = chan->last_type; | |
73 | pkt.whdr.flags = conn->out_clientflag; | |
74 | pkt.whdr.userStatus = 0; | |
75 | pkt.whdr.securityIndex = conn->security_ix; | |
76 | pkt.whdr._rsvd = 0; | |
68d6d1ae | 77 | pkt.whdr.serviceId = htons(conn->service_id); |
18bfeba5 DH |
78 | |
79 | len = sizeof(pkt.whdr); | |
80 | switch (chan->last_type) { | |
81 | case RXRPC_PACKET_TYPE_ABORT: | |
82 | pkt.abort.code = htonl(chan->last_abort); | |
83 | len += sizeof(pkt.abort); | |
84 | break; | |
85 | ||
86 | case RXRPC_PACKET_TYPE_ACK: | |
87 | mtu = conn->params.peer->if_mtu; | |
88 | mtu -= conn->params.peer->hdrsize; | |
89 | pkt.ack.bufferSpace = 0; | |
90 | pkt.ack.maxSkew = htons(skb->priority); | |
91 | pkt.ack.firstPacket = htonl(chan->last_seq); | |
92 | pkt.ack.previousPacket = htonl(chan->last_seq - 1); | |
93 | pkt.ack.serial = htonl(sp->hdr.serial); | |
94 | pkt.ack.reason = RXRPC_ACK_DUPLICATE; | |
95 | pkt.ack.nAcks = 0; | |
96 | pkt.info.rxMTU = htonl(rxrpc_rx_mtu); | |
97 | pkt.info.maxMTU = htonl(mtu); | |
98 | pkt.info.rwind = htonl(rxrpc_rx_window_size); | |
99 | pkt.info.jumbo_max = htonl(rxrpc_rx_jumbo_max); | |
57494343 | 100 | pkt.whdr.flags |= RXRPC_SLOW_START_OK; |
18bfeba5 DH |
101 | len += sizeof(pkt.ack) + sizeof(pkt.info); |
102 | break; | |
103 | } | |
104 | ||
105 | /* Resync with __rxrpc_disconnect_call() and check that the last call | |
106 | * didn't get advanced whilst we were filling out the packets. | |
107 | */ | |
108 | smp_rmb(); | |
109 | if (READ_ONCE(chan->last_call) != call_id) | |
110 | return; | |
111 | ||
112 | iov.iov_base = &pkt; | |
113 | iov.iov_len = len; | |
114 | ||
115 | serial = atomic_inc_return(&conn->serial); | |
116 | pkt.whdr.serial = htonl(serial); | |
117 | ||
118 | switch (chan->last_type) { | |
119 | case RXRPC_PACKET_TYPE_ABORT: | |
120 | _proto("Tx ABORT %%%u { %d } [re]", serial, conn->local_abort); | |
121 | break; | |
122 | case RXRPC_PACKET_TYPE_ACK: | |
be832aec DH |
123 | trace_rxrpc_tx_ack(NULL, serial, chan->last_seq, 0, |
124 | RXRPC_ACK_DUPLICATE, 0); | |
18bfeba5 DH |
125 | _proto("Tx ACK %%%u [re]", serial); |
126 | break; | |
127 | } | |
128 | ||
129 | kernel_sendmsg(conn->params.local->socket, &msg, &iov, 1, len); | |
130 | _leave(""); | |
131 | return; | |
132 | } | |
133 | ||
17926a79 DH |
134 | /* |
135 | * pass a connection-level abort onto all calls on that connection | |
136 | */ | |
f5c17aae DH |
137 | static void rxrpc_abort_calls(struct rxrpc_connection *conn, |
138 | enum rxrpc_call_completion compl, | |
139 | u32 abort_code, int error) | |
17926a79 DH |
140 | { |
141 | struct rxrpc_call *call; | |
248f219c | 142 | int i; |
17926a79 DH |
143 | |
144 | _enter("{%d},%x", conn->debug_id, abort_code); | |
145 | ||
a1399f8b | 146 | spin_lock(&conn->channel_lock); |
17926a79 | 147 | |
a1399f8b DH |
148 | for (i = 0; i < RXRPC_MAXCALLS; i++) { |
149 | call = rcu_dereference_protected( | |
150 | conn->channels[i].call, | |
151 | lockdep_is_held(&conn->channel_lock)); | |
ccbd3dbe | 152 | if (call) { |
5a42976d DH |
153 | if (compl == RXRPC_CALL_LOCALLY_ABORTED) |
154 | trace_rxrpc_abort("CON", call->cid, | |
155 | call->call_id, 0, | |
156 | abort_code, error); | |
248f219c DH |
157 | if (rxrpc_set_call_completion(call, compl, |
158 | abort_code, error)) | |
159 | rxrpc_notify_socket(call); | |
17926a79 | 160 | } |
17926a79 DH |
161 | } |
162 | ||
a1399f8b | 163 | spin_unlock(&conn->channel_lock); |
17926a79 DH |
164 | _leave(""); |
165 | } | |
166 | ||
167 | /* | |
168 | * generate a connection-level abort | |
169 | */ | |
170 | static int rxrpc_abort_connection(struct rxrpc_connection *conn, | |
3a92789a | 171 | int error, u32 abort_code) |
17926a79 | 172 | { |
0d12f8a4 | 173 | struct rxrpc_wire_header whdr; |
17926a79 DH |
174 | struct msghdr msg; |
175 | struct kvec iov[2]; | |
176 | __be32 word; | |
177 | size_t len; | |
0d12f8a4 | 178 | u32 serial; |
17926a79 DH |
179 | int ret; |
180 | ||
181 | _enter("%d,,%u,%u", conn->debug_id, error, abort_code); | |
182 | ||
183 | /* generate a connection-level abort */ | |
184 | spin_lock_bh(&conn->state_lock); | |
f5c17aae | 185 | if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) { |
17926a79 DH |
186 | spin_unlock_bh(&conn->state_lock); |
187 | _leave(" = 0 [already dead]"); | |
188 | return 0; | |
189 | } | |
190 | ||
f5c17aae DH |
191 | conn->state = RXRPC_CONN_LOCALLY_ABORTED; |
192 | spin_unlock_bh(&conn->state_lock); | |
193 | ||
194 | rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code, error); | |
17926a79 | 195 | |
85f32278 DH |
196 | msg.msg_name = &conn->params.peer->srx.transport; |
197 | msg.msg_namelen = conn->params.peer->srx.transport_len; | |
17926a79 DH |
198 | msg.msg_control = NULL; |
199 | msg.msg_controllen = 0; | |
200 | msg.msg_flags = 0; | |
201 | ||
19ffa01c DH |
202 | whdr.epoch = htonl(conn->proto.epoch); |
203 | whdr.cid = htonl(conn->proto.cid); | |
0d12f8a4 DH |
204 | whdr.callNumber = 0; |
205 | whdr.seq = 0; | |
206 | whdr.type = RXRPC_PACKET_TYPE_ABORT; | |
207 | whdr.flags = conn->out_clientflag; | |
208 | whdr.userStatus = 0; | |
209 | whdr.securityIndex = conn->security_ix; | |
210 | whdr._rsvd = 0; | |
68d6d1ae | 211 | whdr.serviceId = htons(conn->service_id); |
17926a79 | 212 | |
dc44b3a0 | 213 | word = htonl(conn->local_abort); |
17926a79 | 214 | |
0d12f8a4 DH |
215 | iov[0].iov_base = &whdr; |
216 | iov[0].iov_len = sizeof(whdr); | |
17926a79 DH |
217 | iov[1].iov_base = &word; |
218 | iov[1].iov_len = sizeof(word); | |
219 | ||
220 | len = iov[0].iov_len + iov[1].iov_len; | |
221 | ||
0d12f8a4 DH |
222 | serial = atomic_inc_return(&conn->serial); |
223 | whdr.serial = htonl(serial); | |
dc44b3a0 | 224 | _proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort); |
17926a79 | 225 | |
85f32278 | 226 | ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len); |
17926a79 DH |
227 | if (ret < 0) { |
228 | _debug("sendmsg failed: %d", ret); | |
229 | return -EAGAIN; | |
230 | } | |
231 | ||
232 | _leave(" = 0"); | |
233 | return 0; | |
234 | } | |
235 | ||
236 | /* | |
237 | * mark a call as being on a now-secured channel | |
248f219c | 238 | * - must be called with BH's disabled. |
17926a79 | 239 | */ |
5eaa65b2 | 240 | static void rxrpc_call_is_secure(struct rxrpc_call *call) |
17926a79 DH |
241 | { |
242 | _enter("%p", call); | |
243 | if (call) { | |
248f219c DH |
244 | write_lock_bh(&call->state_lock); |
245 | if (call->state == RXRPC_CALL_SERVER_SECURING) { | |
246 | call->state = RXRPC_CALL_SERVER_ACCEPTING; | |
247 | rxrpc_notify_socket(call); | |
248 | } | |
249 | write_unlock_bh(&call->state_lock); | |
17926a79 DH |
250 | } |
251 | } | |
252 | ||
253 | /* | |
254 | * connection-level Rx packet processor | |
255 | */ | |
256 | static int rxrpc_process_event(struct rxrpc_connection *conn, | |
257 | struct sk_buff *skb, | |
258 | u32 *_abort_code) | |
259 | { | |
260 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
0d12f8a4 DH |
261 | __be32 wtmp; |
262 | u32 abort_code; | |
17926a79 DH |
263 | int loop, ret; |
264 | ||
519d2567 | 265 | if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) { |
248f219c | 266 | _leave(" = -ECONNABORTED [%u]", conn->state); |
17926a79 | 267 | return -ECONNABORTED; |
519d2567 | 268 | } |
17926a79 | 269 | |
0d12f8a4 | 270 | _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial); |
519d2567 | 271 | |
17926a79 | 272 | switch (sp->hdr.type) { |
18bfeba5 DH |
273 | case RXRPC_PACKET_TYPE_DATA: |
274 | case RXRPC_PACKET_TYPE_ACK: | |
f5c17aae | 275 | rxrpc_conn_retransmit_call(conn, skb); |
18bfeba5 DH |
276 | return 0; |
277 | ||
4d4a6ac7 DH |
278 | case RXRPC_PACKET_TYPE_BUSY: |
279 | /* Just ignore BUSY packets for now. */ | |
280 | return 0; | |
281 | ||
17926a79 | 282 | case RXRPC_PACKET_TYPE_ABORT: |
775e5b71 | 283 | if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header), |
fb46f6ee DH |
284 | &wtmp, sizeof(wtmp)) < 0) { |
285 | trace_rxrpc_rx_eproto(NULL, sp->hdr.serial, | |
286 | tracepoint_string("bad_abort")); | |
17926a79 | 287 | return -EPROTO; |
fb46f6ee | 288 | } |
0d12f8a4 DH |
289 | abort_code = ntohl(wtmp); |
290 | _proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code); | |
17926a79 DH |
291 | |
292 | conn->state = RXRPC_CONN_REMOTELY_ABORTED; | |
248f219c | 293 | rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED, |
3a92789a | 294 | abort_code, -ECONNABORTED); |
17926a79 DH |
295 | return -ECONNABORTED; |
296 | ||
297 | case RXRPC_PACKET_TYPE_CHALLENGE: | |
e0e4d82f DH |
298 | return conn->security->respond_to_challenge(conn, skb, |
299 | _abort_code); | |
17926a79 DH |
300 | |
301 | case RXRPC_PACKET_TYPE_RESPONSE: | |
17926a79 DH |
302 | ret = conn->security->verify_response(conn, skb, _abort_code); |
303 | if (ret < 0) | |
304 | return ret; | |
305 | ||
306 | ret = conn->security->init_connection_security(conn); | |
307 | if (ret < 0) | |
308 | return ret; | |
309 | ||
a263629d HX |
310 | ret = conn->security->prime_packet_security(conn); |
311 | if (ret < 0) | |
312 | return ret; | |
313 | ||
a1399f8b | 314 | spin_lock(&conn->channel_lock); |
17926a79 DH |
315 | spin_lock(&conn->state_lock); |
316 | ||
bba304db DH |
317 | if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) { |
318 | conn->state = RXRPC_CONN_SERVICE; | |
248f219c | 319 | spin_unlock(&conn->state_lock); |
17926a79 | 320 | for (loop = 0; loop < RXRPC_MAXCALLS; loop++) |
dee46364 DH |
321 | rxrpc_call_is_secure( |
322 | rcu_dereference_protected( | |
a1399f8b DH |
323 | conn->channels[loop].call, |
324 | lockdep_is_held(&conn->channel_lock))); | |
248f219c DH |
325 | } else { |
326 | spin_unlock(&conn->state_lock); | |
17926a79 DH |
327 | } |
328 | ||
a1399f8b | 329 | spin_unlock(&conn->channel_lock); |
17926a79 DH |
330 | return 0; |
331 | ||
332 | default: | |
fb46f6ee DH |
333 | trace_rxrpc_rx_eproto(NULL, sp->hdr.serial, |
334 | tracepoint_string("bad_conn_pkt")); | |
17926a79 DH |
335 | return -EPROTO; |
336 | } | |
337 | } | |
338 | ||
339 | /* | |
340 | * set up security and issue a challenge | |
341 | */ | |
342 | static void rxrpc_secure_connection(struct rxrpc_connection *conn) | |
343 | { | |
344 | u32 abort_code; | |
345 | int ret; | |
346 | ||
347 | _enter("{%d}", conn->debug_id); | |
348 | ||
349 | ASSERT(conn->security_ix != 0); | |
350 | ||
19ffa01c | 351 | if (!conn->params.key) { |
17926a79 DH |
352 | _debug("set up security"); |
353 | ret = rxrpc_init_server_conn_security(conn); | |
354 | switch (ret) { | |
355 | case 0: | |
356 | break; | |
357 | case -ENOENT: | |
358 | abort_code = RX_CALL_DEAD; | |
359 | goto abort; | |
360 | default: | |
361 | abort_code = RXKADNOAUTH; | |
362 | goto abort; | |
363 | } | |
364 | } | |
365 | ||
17926a79 DH |
366 | if (conn->security->issue_challenge(conn) < 0) { |
367 | abort_code = RX_CALL_DEAD; | |
368 | ret = -ENOMEM; | |
369 | goto abort; | |
370 | } | |
371 | ||
372 | _leave(""); | |
373 | return; | |
374 | ||
375 | abort: | |
376 | _debug("abort %d, %d", ret, abort_code); | |
3a92789a | 377 | rxrpc_abort_connection(conn, ret, abort_code); |
17926a79 DH |
378 | _leave(" [aborted]"); |
379 | } | |
380 | ||
381 | /* | |
382 | * connection-level event processor | |
383 | */ | |
384 | void rxrpc_process_connection(struct work_struct *work) | |
385 | { | |
386 | struct rxrpc_connection *conn = | |
387 | container_of(work, struct rxrpc_connection, processor); | |
17926a79 DH |
388 | struct sk_buff *skb; |
389 | u32 abort_code = RX_PROTOCOL_ERROR; | |
390 | int ret; | |
391 | ||
363deeab | 392 | rxrpc_see_connection(conn); |
17926a79 | 393 | |
2c4579e4 | 394 | if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events)) |
17926a79 | 395 | rxrpc_secure_connection(conn); |
17926a79 DH |
396 | |
397 | /* go through the conn-level event packets, releasing the ref on this | |
398 | * connection that each one has when we've finished with it */ | |
399 | while ((skb = skb_dequeue(&conn->rx_queue))) { | |
71f3ca40 | 400 | rxrpc_see_skb(skb, rxrpc_skb_rx_seen); |
17926a79 DH |
401 | ret = rxrpc_process_event(conn, skb, &abort_code); |
402 | switch (ret) { | |
403 | case -EPROTO: | |
404 | case -EKEYEXPIRED: | |
405 | case -EKEYREJECTED: | |
406 | goto protocol_error; | |
407 | case -EAGAIN: | |
408 | goto requeue_and_leave; | |
409 | case -ECONNABORTED: | |
410 | default: | |
71f3ca40 | 411 | rxrpc_free_skb(skb, rxrpc_skb_rx_freed); |
17926a79 DH |
412 | break; |
413 | } | |
414 | } | |
415 | ||
416 | out: | |
417 | rxrpc_put_connection(conn); | |
418 | _leave(""); | |
419 | return; | |
420 | ||
421 | requeue_and_leave: | |
422 | skb_queue_head(&conn->rx_queue, skb); | |
423 | goto out; | |
424 | ||
425 | protocol_error: | |
3a92789a | 426 | if (rxrpc_abort_connection(conn, ret, abort_code) < 0) |
17926a79 | 427 | goto requeue_and_leave; |
71f3ca40 | 428 | rxrpc_free_skb(skb, rxrpc_skb_rx_freed); |
17926a79 DH |
429 | goto out; |
430 | } |