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Linux/net/rxrpc/ar-connevent.c

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  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);
 48                         rxrpc_queue_call(call);
 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  */
129 static void rxrpc_call_is_secure(struct rxrpc_call *call)
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))
136                         rxrpc_queue_call(call);
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 
153         if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
154                 kleave(" = -ECONNABORTED [%u]", conn->state);
155                 return -ECONNABORTED;
156         }
157 
158         serial = ntohl(sp->hdr.serial);
159 
160         _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, serial);
161 
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:
206                 _leave(" = -EPROTO [%u]", sp->hdr.type);
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 sk_buff *skb;
263         u32 abort_code = RX_PROTOCOL_ERROR;
264         int ret;
265 
266         _enter("{%d}", conn->debug_id);
267 
268         atomic_inc(&conn->usage);
269 
270         if (test_and_clear_bit(RXRPC_CONN_CHALLENGE, &conn->events)) {
271                 rxrpc_secure_connection(conn);
272                 rxrpc_put_connection(conn);
273         }
274 
275         /* go through the conn-level event packets, releasing the ref on this
276          * connection that each one has when we've finished with it */
277         while ((skb = skb_dequeue(&conn->rx_queue))) {
278                 ret = rxrpc_process_event(conn, skb, &abort_code);
279                 switch (ret) {
280                 case -EPROTO:
281                 case -EKEYEXPIRED:
282                 case -EKEYREJECTED:
283                         goto protocol_error;
284                 case -EAGAIN:
285                         goto requeue_and_leave;
286                 case -ECONNABORTED:
287                 default:
288                         rxrpc_put_connection(conn);
289                         rxrpc_free_skb(skb);
290                         break;
291                 }
292         }
293 
294 out:
295         rxrpc_put_connection(conn);
296         _leave("");
297         return;
298 
299 requeue_and_leave:
300         skb_queue_head(&conn->rx_queue, skb);
301         goto out;
302 
303 protocol_error:
304         if (rxrpc_abort_connection(conn, -ret, abort_code) < 0)
305                 goto requeue_and_leave;
306         rxrpc_put_connection(conn);
307         rxrpc_free_skb(skb);
308         _leave(" [EPROTO]");
309         goto out;
310 }
311 
312 /*
313  * put a packet up for transport-level abort
314  */
315 void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb)
316 {
317         CHECK_SLAB_OKAY(&local->usage);
318 
319         if (!atomic_inc_not_zero(&local->usage)) {
320                 printk("resurrected on reject\n");
321                 BUG();
322         }
323 
324         skb_queue_tail(&local->reject_queue, skb);
325         rxrpc_queue_work(&local->rejecter);
326 }
327 
328 /*
329  * reject packets through the local endpoint
330  */
331 void rxrpc_reject_packets(struct work_struct *work)
332 {
333         union {
334                 struct sockaddr sa;
335                 struct sockaddr_in sin;
336         } sa;
337         struct rxrpc_skb_priv *sp;
338         struct rxrpc_header hdr;
339         struct rxrpc_local *local;
340         struct sk_buff *skb;
341         struct msghdr msg;
342         struct kvec iov[2];
343         size_t size;
344         __be32 code;
345 
346         local = container_of(work, struct rxrpc_local, rejecter);
347         rxrpc_get_local(local);
348 
349         _enter("%d", local->debug_id);
350 
351         iov[0].iov_base = &hdr;
352         iov[0].iov_len = sizeof(hdr);
353         iov[1].iov_base = &code;
354         iov[1].iov_len = sizeof(code);
355         size = sizeof(hdr) + sizeof(code);
356 
357         msg.msg_name = &sa;
358         msg.msg_control = NULL;
359         msg.msg_controllen = 0;
360         msg.msg_flags = 0;
361 
362         memset(&sa, 0, sizeof(sa));
363         sa.sa.sa_family = local->srx.transport.family;
364         switch (sa.sa.sa_family) {
365         case AF_INET:
366                 msg.msg_namelen = sizeof(sa.sin);
367                 break;
368         default:
369                 msg.msg_namelen = 0;
370                 break;
371         }
372 
373         memset(&hdr, 0, sizeof(hdr));
374         hdr.type = RXRPC_PACKET_TYPE_ABORT;
375 
376         while ((skb = skb_dequeue(&local->reject_queue))) {
377                 sp = rxrpc_skb(skb);
378                 switch (sa.sa.sa_family) {
379                 case AF_INET:
380                         sa.sin.sin_port = udp_hdr(skb)->source;
381                         sa.sin.sin_addr.s_addr = ip_hdr(skb)->saddr;
382                         code = htonl(skb->priority);
383 
384                         hdr.epoch = sp->hdr.epoch;
385                         hdr.cid = sp->hdr.cid;
386                         hdr.callNumber = sp->hdr.callNumber;
387                         hdr.serviceId = sp->hdr.serviceId;
388                         hdr.flags = sp->hdr.flags;
389                         hdr.flags ^= RXRPC_CLIENT_INITIATED;
390                         hdr.flags &= RXRPC_CLIENT_INITIATED;
391 
392                         kernel_sendmsg(local->socket, &msg, iov, 2, size);
393                         break;
394 
395                 default:
396                         break;
397                 }
398 
399                 rxrpc_free_skb(skb);
400                 rxrpc_put_local(local);
401         }
402 
403         rxrpc_put_local(local);
404         _leave("");
405 }
406 

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