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TOMOYO Linux Cross Reference
Linux/net/sctp/endpointola.c

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  1 /* SCTP kernel reference Implementation
  2  * Copyright (c) 1999-2000 Cisco, Inc.
  3  * Copyright (c) 1999-2001 Motorola, Inc.
  4  * Copyright (c) 2001-2002 International Business Machines, Corp.
  5  * Copyright (c) 2001 Intel Corp.
  6  * Copyright (c) 2001 Nokia, Inc.
  7  * Copyright (c) 2001 La Monte H.P. Yarroll
  8  *
  9  * This file is part of the SCTP kernel reference Implementation
 10  *
 11  * This abstraction represents an SCTP endpoint.
 12  *
 13  * This file is part of the implementation of the add-IP extension,
 14  * based on <draft-ietf-tsvwg-addip-sctp-02.txt> June 29, 2001,
 15  * for the SCTP kernel reference Implementation.
 16  *
 17  * The SCTP reference implementation is free software;
 18  * you can redistribute it and/or modify it under the terms of
 19  * the GNU General Public License as published by
 20  * the Free Software Foundation; either version 2, or (at your option)
 21  * any later version.
 22  *
 23  * The SCTP reference implementation is distributed in the hope that it
 24  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
 25  *                 ************************
 26  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 27  * See the GNU General Public License for more details.
 28  *
 29  * You should have received a copy of the GNU General Public License
 30  * along with GNU CC; see the file COPYING.  If not, write to
 31  * the Free Software Foundation, 59 Temple Place - Suite 330,
 32  * Boston, MA 02111-1307, USA.
 33  *
 34  * Please send any bug reports or fixes you make to the
 35  * email address(es):
 36  *    lksctp developers <lksctp-developers@lists.sourceforge.net>
 37  *
 38  * Or submit a bug report through the following website:
 39  *    http://www.sf.net/projects/lksctp
 40  *
 41  * Written or modified by:
 42  *    La Monte H.P. Yarroll <piggy@acm.org>
 43  *    Karl Knutson <karl@athena.chicago.il.us>
 44  *    Jon Grimm <jgrimm@austin.ibm.com>
 45  *    Daisy Chang <daisyc@us.ibm.com>
 46  *    Dajiang Zhang <dajiang.zhang@nokia.com>
 47  *
 48  * Any bugs reported given to us we will try to fix... any fixes shared will
 49  * be incorporated into the next SCTP release.
 50  */
 51 
 52 #include <linux/types.h>
 53 #include <linux/sched.h>
 54 #include <linux/slab.h>
 55 #include <linux/in.h>
 56 #include <linux/random.h>       /* get_random_bytes() */
 57 #include <linux/crypto.h>
 58 #include <net/sock.h>
 59 #include <net/ipv6.h>
 60 #include <net/sctp/sctp.h>
 61 #include <net/sctp/sm.h>
 62 
 63 /* Forward declarations for internal helpers. */
 64 static void sctp_endpoint_bh_rcv(struct sctp_endpoint *ep);
 65 
 66 /* Create a sctp_endpoint with all that boring stuff initialized.
 67  * Returns NULL if there isn't enough memory.
 68  */
 69 struct sctp_endpoint *sctp_endpoint_new(struct sock *sk, int gfp)
 70 {
 71         struct sctp_endpoint *ep;
 72 
 73         /* Build a local endpoint. */
 74         ep = t_new(struct sctp_endpoint, gfp);
 75         if (!ep)
 76                 goto fail;
 77         if (!sctp_endpoint_init(ep, sk, gfp))
 78                 goto fail_init;
 79         ep->base.malloced = 1;
 80         SCTP_DBG_OBJCNT_INC(ep);
 81         return ep;
 82 
 83 fail_init:
 84         kfree(ep);
 85 fail:
 86         return NULL;
 87 }
 88 
 89 /*
 90  * Initialize the base fields of the endpoint structure.
 91  */
 92 struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
 93                                          struct sock *sk, int gfp)
 94 {
 95         struct sctp_opt *sp = sctp_sk(sk);
 96         memset(ep, 0, sizeof(struct sctp_endpoint));
 97 
 98         /* Initialize the base structure. */
 99         /* What type of endpoint are we?  */
100         ep->base.type = SCTP_EP_TYPE_SOCKET;
101 
102         /* Initialize the basic object fields. */
103         atomic_set(&ep->base.refcnt, 1);
104         ep->base.dead = 0;
105         ep->base.malloced = 1;
106 
107         /* Create an input queue.  */
108         sctp_inq_init(&ep->base.inqueue);
109 
110         /* Set its top-half handler */
111         sctp_inq_set_th_handler(&ep->base.inqueue,
112                                 (void (*)(void *))sctp_endpoint_bh_rcv, ep);
113 
114         /* Initialize the bind addr area */
115         sctp_bind_addr_init(&ep->base.bind_addr, 0);
116         ep->base.addr_lock = RW_LOCK_UNLOCKED;
117 
118         /* Remember who we are attached to.  */
119         ep->base.sk = sk;
120         sock_hold(ep->base.sk);
121 
122         /* Create the lists of associations.  */
123         INIT_LIST_HEAD(&ep->asocs);
124 
125         /* Set up the base timeout information.  */
126         ep->timeouts[SCTP_EVENT_TIMEOUT_NONE] = 0;
127         ep->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
128                 SCTP_DEFAULT_TIMEOUT_T1_COOKIE;
129         ep->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
130                 SCTP_DEFAULT_TIMEOUT_T1_INIT;
131         ep->timeouts[SCTP_EVENT_TIMEOUT_T2_SHUTDOWN] =
132                 MSECS_TO_JIFFIES(sp->rtoinfo.srto_initial);
133         ep->timeouts[SCTP_EVENT_TIMEOUT_T3_RTX] = 0;
134         ep->timeouts[SCTP_EVENT_TIMEOUT_T4_RTO] = 0;
135 
136         /* sctpimpguide-05 Section 2.12.2
137          * If the 'T5-shutdown-guard' timer is used, it SHOULD be set to the
138          * recommended value of 5 times 'RTO.Max'.
139          */
140         ep->timeouts[SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD]
141                 = 5 * MSECS_TO_JIFFIES(sp->rtoinfo.srto_max);
142 
143         ep->timeouts[SCTP_EVENT_TIMEOUT_HEARTBEAT] =
144                 SCTP_DEFAULT_TIMEOUT_HEARTBEAT;
145         ep->timeouts[SCTP_EVENT_TIMEOUT_SACK] =
146                 SCTP_DEFAULT_TIMEOUT_SACK;
147         ep->timeouts[SCTP_EVENT_TIMEOUT_AUTOCLOSE] =
148                 sp->autoclose * HZ;
149 
150         /* Set up the default send/receive buffer space.  */
151 
152         /* FIXME - Should the min and max window size be configurable
153          * sysctl parameters as opposed to be constants?
154          */
155         sk->sk_rcvbuf = SCTP_DEFAULT_MAXWINDOW;
156         sk->sk_sndbuf = SCTP_DEFAULT_MAXWINDOW * 2;
157 
158         /* Use SCTP specific send buffer space queues.  */
159         sk->sk_write_space = sctp_write_space;
160         sk->sk_use_write_queue = 1;
161 
162         /* Initialize the secret key used with cookie. */
163         get_random_bytes(&ep->secret_key[0], SCTP_SECRET_SIZE);
164         ep->last_key = ep->current_key = 0;
165         ep->key_changed_at = jiffies;
166 
167         ep->debug_name = "unnamedEndpoint";
168         return ep;
169 }
170 
171 /* Add an association to an endpoint.  */
172 void sctp_endpoint_add_asoc(struct sctp_endpoint *ep,
173                             struct sctp_association *asoc)
174 {
175         struct sock *sk = ep->base.sk;
176 
177         /* Now just add it to our list of asocs */
178         list_add_tail(&asoc->asocs, &ep->asocs);
179 
180         /* Increment the backlog value for a TCP-style listening socket. */
181         if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
182                 sk->sk_ack_backlog++;
183 }
184 
185 /* Free the endpoint structure.  Delay cleanup until
186  * all users have released their reference count on this structure.
187  */
188 void sctp_endpoint_free(struct sctp_endpoint *ep)
189 {
190         ep->base.dead = 1;
191         sctp_endpoint_put(ep);
192 }
193 
194 /* Final destructor for endpoint.  */
195 void sctp_endpoint_destroy(struct sctp_endpoint *ep)
196 {
197         SCTP_ASSERT(ep->base.dead, "Endpoint is not dead", return);
198 
199         ep->base.sk->sk_state = SCTP_SS_CLOSED;
200 
201         /* Unlink this endpoint, so we can't find it again! */
202         sctp_unhash_endpoint(ep);
203 
204         /* Free up the HMAC transform. */
205         if (sctp_sk(ep->base.sk)->hmac)
206                 sctp_crypto_free_tfm(sctp_sk(ep->base.sk)->hmac);
207 
208         /* Cleanup. */
209         sctp_inq_free(&ep->base.inqueue);
210         sctp_bind_addr_free(&ep->base.bind_addr);
211 
212         /* Remove and free the port */
213         if (sctp_sk(ep->base.sk)->bind_hash)
214                 sctp_put_port(ep->base.sk);
215 
216         /* Give up our hold on the sock. */
217         if (ep->base.sk)
218                 sock_put(ep->base.sk);
219 
220         /* Finally, free up our memory. */
221         if (ep->base.malloced) {
222                 kfree(ep);
223                 SCTP_DBG_OBJCNT_DEC(ep);
224         }
225 }
226 
227 /* Hold a reference to an endpoint. */
228 void sctp_endpoint_hold(struct sctp_endpoint *ep)
229 {
230         atomic_inc(&ep->base.refcnt);
231 }
232 
233 /* Release a reference to an endpoint and clean up if there are
234  * no more references.
235  */
236 void sctp_endpoint_put(struct sctp_endpoint *ep)
237 {
238         if (atomic_dec_and_test(&ep->base.refcnt))
239                 sctp_endpoint_destroy(ep);
240 }
241 
242 /* Is this the endpoint we are looking for?  */
243 struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *ep,
244                                                const union sctp_addr *laddr)
245 {
246         struct sctp_endpoint *retval;
247 
248         sctp_read_lock(&ep->base.addr_lock);
249         if (ep->base.bind_addr.port == laddr->v4.sin_port) {
250                 if (sctp_bind_addr_match(&ep->base.bind_addr, laddr,
251                                          sctp_sk(ep->base.sk))) {
252                         retval = ep;
253                         goto out;
254                 }
255         }
256 
257         retval = NULL;
258 
259 out:
260         sctp_read_unlock(&ep->base.addr_lock);
261         return retval;
262 }
263 
264 /* Find the association that goes with this chunk.
265  * We do a linear search of the associations for this endpoint.
266  * We return the matching transport address too.
267  */
268 struct sctp_association *__sctp_endpoint_lookup_assoc(
269         const struct sctp_endpoint *ep,
270         const union sctp_addr *paddr,
271         struct sctp_transport **transport)
272 {
273         int rport;
274         struct sctp_association *asoc;
275         struct list_head *pos;
276 
277         rport = paddr->v4.sin_port;
278 
279         list_for_each(pos, &ep->asocs) {
280                 asoc = list_entry(pos, struct sctp_association, asocs);
281                 if (rport == asoc->peer.port) {
282                         sctp_read_lock(&asoc->base.addr_lock);
283                         *transport = sctp_assoc_lookup_paddr(asoc, paddr);
284                         sctp_read_unlock(&asoc->base.addr_lock);
285 
286                         if (*transport)
287                                 return asoc;
288                 }
289         }
290 
291         *transport = NULL;
292         return NULL;
293 }
294 
295 /* Lookup association on an endpoint based on a peer address.  BH-safe.  */
296 struct sctp_association *sctp_endpoint_lookup_assoc(
297         const struct sctp_endpoint *ep,
298         const union sctp_addr *paddr,
299         struct sctp_transport **transport)
300 {
301         struct sctp_association *asoc;
302 
303         sctp_local_bh_disable();
304         asoc = __sctp_endpoint_lookup_assoc(ep, paddr, transport);
305         sctp_local_bh_enable();
306 
307         return asoc;
308 }
309 
310 /* Look for any peeled off association from the endpoint that matches the
311  * given peer address.
312  */
313 int sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
314                                 const union sctp_addr *paddr)
315 {
316         struct list_head *pos;
317         struct sctp_sockaddr_entry *addr;
318         struct sctp_bind_addr *bp;
319 
320         sctp_read_lock(&ep->base.addr_lock);
321         bp = &ep->base.bind_addr;
322         list_for_each(pos, &bp->address_list) {
323                 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
324                 if (sctp_has_association(&addr->a, paddr)) {
325                         sctp_read_unlock(&ep->base.addr_lock);
326                         return 1;
327                 }
328         }
329         sctp_read_unlock(&ep->base.addr_lock);
330 
331         return 0;
332 }
333 
334 /* Do delayed input processing.  This is scheduled by sctp_rcv().
335  * This may be called on BH or task time.
336  */
337 static void sctp_endpoint_bh_rcv(struct sctp_endpoint *ep)
338 {
339         struct sctp_association *asoc;
340         struct sock *sk;
341         struct sctp_transport *transport;
342         struct sctp_chunk *chunk;
343         struct sctp_inq *inqueue;
344         sctp_subtype_t subtype;
345         sctp_state_t state;
346         int error = 0;
347 
348         if (ep->base.dead)
349                 return;
350 
351         asoc = NULL;
352         inqueue = &ep->base.inqueue;
353         sk = ep->base.sk;
354 
355         while (NULL != (chunk = sctp_inq_pop(inqueue))) {
356                 subtype.chunk = chunk->chunk_hdr->type;
357 
358                 /* We might have grown an association since last we
359                  * looked, so try again.
360                  *
361                  * This happens when we've just processed our
362                  * COOKIE-ECHO chunk.
363                  */
364                 if (NULL == chunk->asoc) {
365                         asoc = sctp_endpoint_lookup_assoc(ep,
366                                                           sctp_source(chunk),
367                                                           &transport);
368                         chunk->asoc = asoc;
369                         chunk->transport = transport;
370                 }
371 
372                 state = asoc ? asoc->state : SCTP_STATE_CLOSED;
373 
374                 /* Remember where the last DATA chunk came from so we
375                  * know where to send the SACK.
376                  */
377                 if (asoc && sctp_chunk_is_data(chunk))
378                         asoc->peer.last_data_from = chunk->transport;
379                 else
380                         SCTP_INC_STATS(SctpInCtrlChunks);
381 
382                 if (chunk->transport)
383                         chunk->transport->last_time_heard = jiffies;
384 
385                 error = sctp_do_sm(SCTP_EVENT_T_CHUNK, subtype, state,
386                                    ep, asoc, chunk, GFP_ATOMIC);
387 
388                 if (error && chunk)
389                         chunk->pdiscard = 1;
390 
391                 /* Check to see if the endpoint is freed in response to
392                  * the incoming chunk. If so, get out of the while loop.
393                  */
394                 if (!sctp_sk(sk)->ep)
395                         break;
396         }
397 }
398 

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