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Linux/net/llc/af_llc.c

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  1 /*
  2  * af_llc.c - LLC User Interface SAPs
  3  * Description:
  4  *   Functions in this module are implementation of socket based llc
  5  *   communications for the Linux operating system. Support of llc class
  6  *   one and class two is provided via SOCK_DGRAM and SOCK_STREAM
  7  *   respectively.
  8  *
  9  *   An llc2 connection is (mac + sap), only one llc2 sap connection
 10  *   is allowed per mac. Though one sap may have multiple mac + sap
 11  *   connections.
 12  *
 13  * Copyright (c) 2001 by Jay Schulist <jschlst@samba.org>
 14  *               2002-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 15  *
 16  * This program can be redistributed or modified under the terms of the
 17  * GNU General Public License as published by the Free Software Foundation.
 18  * This program is distributed without any warranty or implied warranty
 19  * of merchantability or fitness for a particular purpose.
 20  *
 21  * See the GNU General Public License for more details.
 22  */
 23 #include <linux/compiler.h>
 24 #include <linux/kernel.h>
 25 #include <linux/module.h>
 26 #include <linux/rtnetlink.h>
 27 #include <linux/init.h>
 28 #include <linux/slab.h>
 29 #include <net/llc.h>
 30 #include <net/llc_sap.h>
 31 #include <net/llc_pdu.h>
 32 #include <net/llc_conn.h>
 33 #include <net/tcp_states.h>
 34 
 35 /* remember: uninitialized global data is zeroed because its in .bss */
 36 static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
 37 static u16 llc_ui_sap_link_no_max[256];
 38 static struct sockaddr_llc llc_ui_addrnull;
 39 static const struct proto_ops llc_ui_ops;
 40 
 41 static long llc_ui_wait_for_conn(struct sock *sk, long timeout);
 42 static int llc_ui_wait_for_disc(struct sock *sk, long timeout);
 43 static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout);
 44 
 45 #if 0
 46 #define dprintk(args...) printk(KERN_DEBUG args)
 47 #else
 48 #define dprintk(args...)
 49 #endif
 50 
 51 /* Maybe we'll add some more in the future. */
 52 #define LLC_CMSG_PKTINFO        1
 53 
 54 
 55 /**
 56  *      llc_ui_next_link_no - return the next unused link number for a sap
 57  *      @sap: Address of sap to get link number from.
 58  *
 59  *      Return the next unused link number for a given sap.
 60  */
 61 static inline u16 llc_ui_next_link_no(int sap)
 62 {
 63         return llc_ui_sap_link_no_max[sap]++;
 64 }
 65 
 66 /**
 67  *      llc_proto_type - return eth protocol for ARP header type
 68  *      @arphrd: ARP header type.
 69  *
 70  *      Given an ARP header type return the corresponding ethernet protocol.
 71  */
 72 static inline __be16 llc_proto_type(u16 arphrd)
 73 {
 74         return htons(ETH_P_802_2);
 75 }
 76 
 77 /**
 78  *      llc_ui_addr_null - determines if a address structure is null
 79  *      @addr: Address to test if null.
 80  */
 81 static inline u8 llc_ui_addr_null(struct sockaddr_llc *addr)
 82 {
 83         return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr));
 84 }
 85 
 86 /**
 87  *      llc_ui_header_len - return length of llc header based on operation
 88  *      @sk: Socket which contains a valid llc socket type.
 89  *      @addr: Complete sockaddr_llc structure received from the user.
 90  *
 91  *      Provide the length of the llc header depending on what kind of
 92  *      operation the user would like to perform and the type of socket.
 93  *      Returns the correct llc header length.
 94  */
 95 static inline u8 llc_ui_header_len(struct sock *sk, struct sockaddr_llc *addr)
 96 {
 97         u8 rc = LLC_PDU_LEN_U;
 98 
 99         if (addr->sllc_test || addr->sllc_xid)
100                 rc = LLC_PDU_LEN_U;
101         else if (sk->sk_type == SOCK_STREAM)
102                 rc = LLC_PDU_LEN_I;
103         return rc;
104 }
105 
106 /**
107  *      llc_ui_send_data - send data via reliable llc2 connection
108  *      @sk: Connection the socket is using.
109  *      @skb: Data the user wishes to send.
110  *      @noblock: can we block waiting for data?
111  *
112  *      Send data via reliable llc2 connection.
113  *      Returns 0 upon success, non-zero if action did not succeed.
114  */
115 static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock)
116 {
117         struct llc_sock* llc = llc_sk(sk);
118         int rc = 0;
119 
120         if (unlikely(llc_data_accept_state(llc->state) ||
121                      llc->remote_busy_flag ||
122                      llc->p_flag)) {
123                 long timeout = sock_sndtimeo(sk, noblock);
124 
125                 rc = llc_ui_wait_for_busy_core(sk, timeout);
126         }
127         if (unlikely(!rc))
128                 rc = llc_build_and_send_pkt(sk, skb);
129         return rc;
130 }
131 
132 static void llc_ui_sk_init(struct socket *sock, struct sock *sk)
133 {
134         sock_graft(sk, sock);
135         sk->sk_type     = sock->type;
136         sock->ops       = &llc_ui_ops;
137 }
138 
139 static struct proto llc_proto = {
140         .name     = "LLC",
141         .owner    = THIS_MODULE,
142         .obj_size = sizeof(struct llc_sock),
143         .slab_flags = SLAB_DESTROY_BY_RCU,
144 };
145 
146 /**
147  *      llc_ui_create - alloc and init a new llc_ui socket
148  *      @net: network namespace (must be default network)
149  *      @sock: Socket to initialize and attach allocated sk to.
150  *      @protocol: Unused.
151  *      @kern: on behalf of kernel or userspace
152  *
153  *      Allocate and initialize a new llc_ui socket, validate the user wants a
154  *      socket type we have available.
155  *      Returns 0 upon success, negative upon failure.
156  */
157 static int llc_ui_create(struct net *net, struct socket *sock, int protocol,
158                          int kern)
159 {
160         struct sock *sk;
161         int rc = -ESOCKTNOSUPPORT;
162 
163         if (!ns_capable(net->user_ns, CAP_NET_RAW))
164                 return -EPERM;
165 
166         if (!net_eq(net, &init_net))
167                 return -EAFNOSUPPORT;
168 
169         if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) {
170                 rc = -ENOMEM;
171                 sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto, kern);
172                 if (sk) {
173                         rc = 0;
174                         llc_ui_sk_init(sock, sk);
175                 }
176         }
177         return rc;
178 }
179 
180 /**
181  *      llc_ui_release - shutdown socket
182  *      @sock: Socket to release.
183  *
184  *      Shutdown and deallocate an existing socket.
185  */
186 static int llc_ui_release(struct socket *sock)
187 {
188         struct sock *sk = sock->sk;
189         struct llc_sock *llc;
190 
191         if (unlikely(sk == NULL))
192                 goto out;
193         sock_hold(sk);
194         lock_sock(sk);
195         llc = llc_sk(sk);
196         dprintk("%s: closing local(%02X) remote(%02X)\n", __func__,
197                 llc->laddr.lsap, llc->daddr.lsap);
198         if (!llc_send_disc(sk))
199                 llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
200         if (!sock_flag(sk, SOCK_ZAPPED))
201                 llc_sap_remove_socket(llc->sap, sk);
202         release_sock(sk);
203         if (llc->dev)
204                 dev_put(llc->dev);
205         sock_put(sk);
206         llc_sk_free(sk);
207 out:
208         return 0;
209 }
210 
211 /**
212  *      llc_ui_autoport - provide dynamically allocate SAP number
213  *
214  *      Provide the caller with a dynamically allocated SAP number according
215  *      to the rules that are set in this function. Returns: 0, upon failure,
216  *      SAP number otherwise.
217  */
218 static int llc_ui_autoport(void)
219 {
220         struct llc_sap *sap;
221         int i, tries = 0;
222 
223         while (tries < LLC_SAP_DYN_TRIES) {
224                 for (i = llc_ui_sap_last_autoport;
225                      i < LLC_SAP_DYN_STOP; i += 2) {
226                         sap = llc_sap_find(i);
227                         if (!sap) {
228                                 llc_ui_sap_last_autoport = i + 2;
229                                 goto out;
230                         }
231                         llc_sap_put(sap);
232                 }
233                 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
234                 tries++;
235         }
236         i = 0;
237 out:
238         return i;
239 }
240 
241 /**
242  *      llc_ui_autobind - automatically bind a socket to a sap
243  *      @sock: socket to bind
244  *      @addr: address to connect to
245  *
246  *      Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't
247  *      specifically used llc_ui_bind to bind to an specific address/sap
248  *
249  *      Returns: 0 upon success, negative otherwise.
250  */
251 static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
252 {
253         struct sock *sk = sock->sk;
254         struct llc_sock *llc = llc_sk(sk);
255         struct llc_sap *sap;
256         int rc = -EINVAL;
257 
258         if (!sock_flag(sk, SOCK_ZAPPED))
259                 goto out;
260         rc = -ENODEV;
261         if (sk->sk_bound_dev_if) {
262                 llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
263                 if (llc->dev && addr->sllc_arphrd != llc->dev->type) {
264                         dev_put(llc->dev);
265                         llc->dev = NULL;
266                 }
267         } else
268                 llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd);
269         if (!llc->dev)
270                 goto out;
271         rc = -EUSERS;
272         llc->laddr.lsap = llc_ui_autoport();
273         if (!llc->laddr.lsap)
274                 goto out;
275         rc = -EBUSY; /* some other network layer is using the sap */
276         sap = llc_sap_open(llc->laddr.lsap, NULL);
277         if (!sap)
278                 goto out;
279         memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN);
280         memcpy(&llc->addr, addr, sizeof(llc->addr));
281         /* assign new connection to its SAP */
282         llc_sap_add_socket(sap, sk);
283         sock_reset_flag(sk, SOCK_ZAPPED);
284         rc = 0;
285 out:
286         return rc;
287 }
288 
289 /**
290  *      llc_ui_bind - bind a socket to a specific address.
291  *      @sock: Socket to bind an address to.
292  *      @uaddr: Address the user wants the socket bound to.
293  *      @addrlen: Length of the uaddr structure.
294  *
295  *      Bind a socket to a specific address. For llc a user is able to bind to
296  *      a specific sap only or mac + sap.
297  *      If the user desires to bind to a specific mac + sap, it is possible to
298  *      have multiple sap connections via multiple macs.
299  *      Bind and autobind for that matter must enforce the correct sap usage
300  *      otherwise all hell will break loose.
301  *      Returns: 0 upon success, negative otherwise.
302  */
303 static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
304 {
305         struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
306         struct sock *sk = sock->sk;
307         struct llc_sock *llc = llc_sk(sk);
308         struct llc_sap *sap;
309         int rc = -EINVAL;
310 
311         dprintk("%s: binding %02X\n", __func__, addr->sllc_sap);
312         if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)))
313                 goto out;
314         rc = -EAFNOSUPPORT;
315         if (unlikely(addr->sllc_family != AF_LLC))
316                 goto out;
317         rc = -ENODEV;
318         rcu_read_lock();
319         if (sk->sk_bound_dev_if) {
320                 llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if);
321                 if (llc->dev) {
322                         if (!addr->sllc_arphrd)
323                                 addr->sllc_arphrd = llc->dev->type;
324                         if (is_zero_ether_addr(addr->sllc_mac))
325                                 memcpy(addr->sllc_mac, llc->dev->dev_addr,
326                                        IFHWADDRLEN);
327                         if (addr->sllc_arphrd != llc->dev->type ||
328                             !ether_addr_equal(addr->sllc_mac,
329                                               llc->dev->dev_addr)) {
330                                 rc = -EINVAL;
331                                 llc->dev = NULL;
332                         }
333                 }
334         } else
335                 llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd,
336                                            addr->sllc_mac);
337         if (llc->dev)
338                 dev_hold(llc->dev);
339         rcu_read_unlock();
340         if (!llc->dev)
341                 goto out;
342         if (!addr->sllc_sap) {
343                 rc = -EUSERS;
344                 addr->sllc_sap = llc_ui_autoport();
345                 if (!addr->sllc_sap)
346                         goto out;
347         }
348         sap = llc_sap_find(addr->sllc_sap);
349         if (!sap) {
350                 sap = llc_sap_open(addr->sllc_sap, NULL);
351                 rc = -EBUSY; /* some other network layer is using the sap */
352                 if (!sap)
353                         goto out;
354         } else {
355                 struct llc_addr laddr, daddr;
356                 struct sock *ask;
357 
358                 memset(&laddr, 0, sizeof(laddr));
359                 memset(&daddr, 0, sizeof(daddr));
360                 /*
361                  * FIXME: check if the address is multicast,
362                  *        only SOCK_DGRAM can do this.
363                  */
364                 memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
365                 laddr.lsap = addr->sllc_sap;
366                 rc = -EADDRINUSE; /* mac + sap clash. */
367                 ask = llc_lookup_established(sap, &daddr, &laddr);
368                 if (ask) {
369                         sock_put(ask);
370                         goto out_put;
371                 }
372         }
373         llc->laddr.lsap = addr->sllc_sap;
374         memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN);
375         memcpy(&llc->addr, addr, sizeof(llc->addr));
376         /* assign new connection to its SAP */
377         llc_sap_add_socket(sap, sk);
378         sock_reset_flag(sk, SOCK_ZAPPED);
379         rc = 0;
380 out_put:
381         llc_sap_put(sap);
382 out:
383         return rc;
384 }
385 
386 /**
387  *      llc_ui_shutdown - shutdown a connect llc2 socket.
388  *      @sock: Socket to shutdown.
389  *      @how: What part of the socket to shutdown.
390  *
391  *      Shutdown a connected llc2 socket. Currently this function only supports
392  *      shutting down both sends and receives (2), we could probably make this
393  *      function such that a user can shutdown only half the connection but not
394  *      right now.
395  *      Returns: 0 upon success, negative otherwise.
396  */
397 static int llc_ui_shutdown(struct socket *sock, int how)
398 {
399         struct sock *sk = sock->sk;
400         int rc = -ENOTCONN;
401 
402         lock_sock(sk);
403         if (unlikely(sk->sk_state != TCP_ESTABLISHED))
404                 goto out;
405         rc = -EINVAL;
406         if (how != 2)
407                 goto out;
408         rc = llc_send_disc(sk);
409         if (!rc)
410                 rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
411         /* Wake up anyone sleeping in poll */
412         sk->sk_state_change(sk);
413 out:
414         release_sock(sk);
415         return rc;
416 }
417 
418 /**
419  *      llc_ui_connect - Connect to a remote llc2 mac + sap.
420  *      @sock: Socket which will be connected to the remote destination.
421  *      @uaddr: Remote and possibly the local address of the new connection.
422  *      @addrlen: Size of uaddr structure.
423  *      @flags: Operational flags specified by the user.
424  *
425  *      Connect to a remote llc2 mac + sap. The caller must specify the
426  *      destination mac and address to connect to. If the user hasn't previously
427  *      called bind(2) with a smac the address of the first interface of the
428  *      specified arp type will be used.
429  *      This function will autobind if user did not previously call bind.
430  *      Returns: 0 upon success, negative otherwise.
431  */
432 static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
433                           int addrlen, int flags)
434 {
435         struct sock *sk = sock->sk;
436         struct llc_sock *llc = llc_sk(sk);
437         struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
438         int rc = -EINVAL;
439 
440         lock_sock(sk);
441         if (unlikely(addrlen != sizeof(*addr)))
442                 goto out;
443         rc = -EAFNOSUPPORT;
444         if (unlikely(addr->sllc_family != AF_LLC))
445                 goto out;
446         if (unlikely(sk->sk_type != SOCK_STREAM))
447                 goto out;
448         rc = -EALREADY;
449         if (unlikely(sock->state == SS_CONNECTING))
450                 goto out;
451         /* bind connection to sap if user hasn't done it. */
452         if (sock_flag(sk, SOCK_ZAPPED)) {
453                 /* bind to sap with null dev, exclusive */
454                 rc = llc_ui_autobind(sock, addr);
455                 if (rc)
456                         goto out;
457         }
458         llc->daddr.lsap = addr->sllc_sap;
459         memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
460         sock->state = SS_CONNECTING;
461         sk->sk_state   = TCP_SYN_SENT;
462         llc->link   = llc_ui_next_link_no(llc->sap->laddr.lsap);
463         rc = llc_establish_connection(sk, llc->dev->dev_addr,
464                                       addr->sllc_mac, addr->sllc_sap);
465         if (rc) {
466                 dprintk("%s: llc_ui_send_conn failed :-(\n", __func__);
467                 sock->state  = SS_UNCONNECTED;
468                 sk->sk_state = TCP_CLOSE;
469                 goto out;
470         }
471 
472         if (sk->sk_state == TCP_SYN_SENT) {
473                 const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
474 
475                 if (!timeo || !llc_ui_wait_for_conn(sk, timeo))
476                         goto out;
477 
478                 rc = sock_intr_errno(timeo);
479                 if (signal_pending(current))
480                         goto out;
481         }
482 
483         if (sk->sk_state == TCP_CLOSE)
484                 goto sock_error;
485 
486         sock->state = SS_CONNECTED;
487         rc = 0;
488 out:
489         release_sock(sk);
490         return rc;
491 sock_error:
492         rc = sock_error(sk) ? : -ECONNABORTED;
493         sock->state = SS_UNCONNECTED;
494         goto out;
495 }
496 
497 /**
498  *      llc_ui_listen - allow a normal socket to accept incoming connections
499  *      @sock: Socket to allow incoming connections on.
500  *      @backlog: Number of connections to queue.
501  *
502  *      Allow a normal socket to accept incoming connections.
503  *      Returns 0 upon success, negative otherwise.
504  */
505 static int llc_ui_listen(struct socket *sock, int backlog)
506 {
507         struct sock *sk = sock->sk;
508         int rc = -EINVAL;
509 
510         lock_sock(sk);
511         if (unlikely(sock->state != SS_UNCONNECTED))
512                 goto out;
513         rc = -EOPNOTSUPP;
514         if (unlikely(sk->sk_type != SOCK_STREAM))
515                 goto out;
516         rc = -EAGAIN;
517         if (sock_flag(sk, SOCK_ZAPPED))
518                 goto out;
519         rc = 0;
520         if (!(unsigned int)backlog)     /* BSDism */
521                 backlog = 1;
522         sk->sk_max_ack_backlog = backlog;
523         if (sk->sk_state != TCP_LISTEN) {
524                 sk->sk_ack_backlog = 0;
525                 sk->sk_state       = TCP_LISTEN;
526         }
527         sk->sk_socket->flags |= __SO_ACCEPTCON;
528 out:
529         release_sock(sk);
530         return rc;
531 }
532 
533 static int llc_ui_wait_for_disc(struct sock *sk, long timeout)
534 {
535         DEFINE_WAIT(wait);
536         int rc = 0;
537 
538         while (1) {
539                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
540                 if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE))
541                         break;
542                 rc = -ERESTARTSYS;
543                 if (signal_pending(current))
544                         break;
545                 rc = -EAGAIN;
546                 if (!timeout)
547                         break;
548                 rc = 0;
549         }
550         finish_wait(sk_sleep(sk), &wait);
551         return rc;
552 }
553 
554 static long llc_ui_wait_for_conn(struct sock *sk, long timeout)
555 {
556         DEFINE_WAIT(wait);
557 
558         while (1) {
559                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
560                 if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT))
561                         break;
562                 if (signal_pending(current) || !timeout)
563                         break;
564         }
565         finish_wait(sk_sleep(sk), &wait);
566         return timeout;
567 }
568 
569 static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout)
570 {
571         DEFINE_WAIT(wait);
572         struct llc_sock *llc = llc_sk(sk);
573         int rc;
574 
575         while (1) {
576                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
577                 rc = 0;
578                 if (sk_wait_event(sk, &timeout,
579                                   (sk->sk_shutdown & RCV_SHUTDOWN) ||
580                                   (!llc_data_accept_state(llc->state) &&
581                                    !llc->remote_busy_flag &&
582                                    !llc->p_flag)))
583                         break;
584                 rc = -ERESTARTSYS;
585                 if (signal_pending(current))
586                         break;
587                 rc = -EAGAIN;
588                 if (!timeout)
589                         break;
590         }
591         finish_wait(sk_sleep(sk), &wait);
592         return rc;
593 }
594 
595 static int llc_wait_data(struct sock *sk, long timeo)
596 {
597         int rc;
598 
599         while (1) {
600                 /*
601                  * POSIX 1003.1g mandates this order.
602                  */
603                 rc = sock_error(sk);
604                 if (rc)
605                         break;
606                 rc = 0;
607                 if (sk->sk_shutdown & RCV_SHUTDOWN)
608                         break;
609                 rc = -EAGAIN;
610                 if (!timeo)
611                         break;
612                 rc = sock_intr_errno(timeo);
613                 if (signal_pending(current))
614                         break;
615                 rc = 0;
616                 if (sk_wait_data(sk, &timeo, NULL))
617                         break;
618         }
619         return rc;
620 }
621 
622 static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb)
623 {
624         struct llc_sock *llc = llc_sk(skb->sk);
625 
626         if (llc->cmsg_flags & LLC_CMSG_PKTINFO) {
627                 struct llc_pktinfo info;
628 
629                 memset(&info, 0, sizeof(info));
630                 info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex;
631                 llc_pdu_decode_dsap(skb, &info.lpi_sap);
632                 llc_pdu_decode_da(skb, info.lpi_mac);
633                 put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info);
634         }
635 }
636 
637 /**
638  *      llc_ui_accept - accept a new incoming connection.
639  *      @sock: Socket which connections arrive on.
640  *      @newsock: Socket to move incoming connection to.
641  *      @flags: User specified operational flags.
642  *
643  *      Accept a new incoming connection.
644  *      Returns 0 upon success, negative otherwise.
645  */
646 static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags)
647 {
648         struct sock *sk = sock->sk, *newsk;
649         struct llc_sock *llc, *newllc;
650         struct sk_buff *skb;
651         int rc = -EOPNOTSUPP;
652 
653         dprintk("%s: accepting on %02X\n", __func__,
654                 llc_sk(sk)->laddr.lsap);
655         lock_sock(sk);
656         if (unlikely(sk->sk_type != SOCK_STREAM))
657                 goto out;
658         rc = -EINVAL;
659         if (unlikely(sock->state != SS_UNCONNECTED ||
660                      sk->sk_state != TCP_LISTEN))
661                 goto out;
662         /* wait for a connection to arrive. */
663         if (skb_queue_empty(&sk->sk_receive_queue)) {
664                 rc = llc_wait_data(sk, sk->sk_rcvtimeo);
665                 if (rc)
666                         goto out;
667         }
668         dprintk("%s: got a new connection on %02X\n", __func__,
669                 llc_sk(sk)->laddr.lsap);
670         skb = skb_dequeue(&sk->sk_receive_queue);
671         rc = -EINVAL;
672         if (!skb->sk)
673                 goto frees;
674         rc = 0;
675         newsk = skb->sk;
676         /* attach connection to a new socket. */
677         llc_ui_sk_init(newsock, newsk);
678         sock_reset_flag(newsk, SOCK_ZAPPED);
679         newsk->sk_state         = TCP_ESTABLISHED;
680         newsock->state          = SS_CONNECTED;
681         llc                     = llc_sk(sk);
682         newllc                  = llc_sk(newsk);
683         memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr));
684         newllc->link = llc_ui_next_link_no(newllc->laddr.lsap);
685 
686         /* put original socket back into a clean listen state. */
687         sk->sk_state = TCP_LISTEN;
688         sk->sk_ack_backlog--;
689         dprintk("%s: ok success on %02X, client on %02X\n", __func__,
690                 llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
691 frees:
692         kfree_skb(skb);
693 out:
694         release_sock(sk);
695         return rc;
696 }
697 
698 /**
699  *      llc_ui_recvmsg - copy received data to the socket user.
700  *      @sock: Socket to copy data from.
701  *      @msg: Various user space related information.
702  *      @len: Size of user buffer.
703  *      @flags: User specified flags.
704  *
705  *      Copy received data to the socket user.
706  *      Returns non-negative upon success, negative otherwise.
707  */
708 static int llc_ui_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
709                           int flags)
710 {
711         DECLARE_SOCKADDR(struct sockaddr_llc *, uaddr, msg->msg_name);
712         const int nonblock = flags & MSG_DONTWAIT;
713         struct sk_buff *skb = NULL;
714         struct sock *sk = sock->sk;
715         struct llc_sock *llc = llc_sk(sk);
716         unsigned long cpu_flags;
717         size_t copied = 0;
718         u32 peek_seq = 0;
719         u32 *seq, skb_len;
720         unsigned long used;
721         int target;     /* Read at least this many bytes */
722         long timeo;
723 
724         lock_sock(sk);
725         copied = -ENOTCONN;
726         if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN))
727                 goto out;
728 
729         timeo = sock_rcvtimeo(sk, nonblock);
730 
731         seq = &llc->copied_seq;
732         if (flags & MSG_PEEK) {
733                 peek_seq = llc->copied_seq;
734                 seq = &peek_seq;
735         }
736 
737         target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
738         copied = 0;
739 
740         do {
741                 u32 offset;
742 
743                 /*
744                  * We need to check signals first, to get correct SIGURG
745                  * handling. FIXME: Need to check this doesn't impact 1003.1g
746                  * and move it down to the bottom of the loop
747                  */
748                 if (signal_pending(current)) {
749                         if (copied)
750                                 break;
751                         copied = timeo ? sock_intr_errno(timeo) : -EAGAIN;
752                         break;
753                 }
754 
755                 /* Next get a buffer. */
756 
757                 skb = skb_peek(&sk->sk_receive_queue);
758                 if (skb) {
759                         offset = *seq;
760                         goto found_ok_skb;
761                 }
762                 /* Well, if we have backlog, try to process it now yet. */
763 
764                 if (copied >= target && !sk->sk_backlog.tail)
765                         break;
766 
767                 if (copied) {
768                         if (sk->sk_err ||
769                             sk->sk_state == TCP_CLOSE ||
770                             (sk->sk_shutdown & RCV_SHUTDOWN) ||
771                             !timeo ||
772                             (flags & MSG_PEEK))
773                                 break;
774                 } else {
775                         if (sock_flag(sk, SOCK_DONE))
776                                 break;
777 
778                         if (sk->sk_err) {
779                                 copied = sock_error(sk);
780                                 break;
781                         }
782                         if (sk->sk_shutdown & RCV_SHUTDOWN)
783                                 break;
784 
785                         if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) {
786                                 if (!sock_flag(sk, SOCK_DONE)) {
787                                         /*
788                                          * This occurs when user tries to read
789                                          * from never connected socket.
790                                          */
791                                         copied = -ENOTCONN;
792                                         break;
793                                 }
794                                 break;
795                         }
796                         if (!timeo) {
797                                 copied = -EAGAIN;
798                                 break;
799                         }
800                 }
801 
802                 if (copied >= target) { /* Do not sleep, just process backlog. */
803                         release_sock(sk);
804                         lock_sock(sk);
805                 } else
806                         sk_wait_data(sk, &timeo, NULL);
807 
808                 if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) {
809                         net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n",
810                                             current->comm,
811                                             task_pid_nr(current));
812                         peek_seq = llc->copied_seq;
813                 }
814                 continue;
815         found_ok_skb:
816                 skb_len = skb->len;
817                 /* Ok so how much can we use? */
818                 used = skb->len - offset;
819                 if (len < used)
820                         used = len;
821 
822                 if (!(flags & MSG_TRUNC)) {
823                         int rc = skb_copy_datagram_msg(skb, offset, msg, used);
824                         if (rc) {
825                                 /* Exception. Bailout! */
826                                 if (!copied)
827                                         copied = -EFAULT;
828                                 break;
829                         }
830                 }
831 
832                 *seq += used;
833                 copied += used;
834                 len -= used;
835 
836                 /* For non stream protcols we get one packet per recvmsg call */
837                 if (sk->sk_type != SOCK_STREAM)
838                         goto copy_uaddr;
839 
840                 if (!(flags & MSG_PEEK)) {
841                         spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags);
842                         sk_eat_skb(sk, skb);
843                         spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags);
844                         *seq = 0;
845                 }
846 
847                 /* Partial read */
848                 if (used + offset < skb_len)
849                         continue;
850         } while (len > 0);
851 
852 out:
853         release_sock(sk);
854         return copied;
855 copy_uaddr:
856         if (uaddr != NULL && skb != NULL) {
857                 memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
858                 msg->msg_namelen = sizeof(*uaddr);
859         }
860         if (llc_sk(sk)->cmsg_flags)
861                 llc_cmsg_rcv(msg, skb);
862 
863         if (!(flags & MSG_PEEK)) {
864                 spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags);
865                 sk_eat_skb(sk, skb);
866                 spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags);
867                 *seq = 0;
868         }
869 
870         goto out;
871 }
872 
873 /**
874  *      llc_ui_sendmsg - Transmit data provided by the socket user.
875  *      @sock: Socket to transmit data from.
876  *      @msg: Various user related information.
877  *      @len: Length of data to transmit.
878  *
879  *      Transmit data provided by the socket user.
880  *      Returns non-negative upon success, negative otherwise.
881  */
882 static int llc_ui_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
883 {
884         struct sock *sk = sock->sk;
885         struct llc_sock *llc = llc_sk(sk);
886         DECLARE_SOCKADDR(struct sockaddr_llc *, addr, msg->msg_name);
887         int flags = msg->msg_flags;
888         int noblock = flags & MSG_DONTWAIT;
889         struct sk_buff *skb;
890         size_t size = 0;
891         int rc = -EINVAL, copied = 0, hdrlen;
892 
893         dprintk("%s: sending from %02X to %02X\n", __func__,
894                 llc->laddr.lsap, llc->daddr.lsap);
895         lock_sock(sk);
896         if (addr) {
897                 if (msg->msg_namelen < sizeof(*addr))
898                         goto release;
899         } else {
900                 if (llc_ui_addr_null(&llc->addr))
901                         goto release;
902                 addr = &llc->addr;
903         }
904         /* must bind connection to sap if user hasn't done it. */
905         if (sock_flag(sk, SOCK_ZAPPED)) {
906                 /* bind to sap with null dev, exclusive. */
907                 rc = llc_ui_autobind(sock, addr);
908                 if (rc)
909                         goto release;
910         }
911         hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr);
912         size = hdrlen + len;
913         if (size > llc->dev->mtu)
914                 size = llc->dev->mtu;
915         copied = size - hdrlen;
916         release_sock(sk);
917         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
918         lock_sock(sk);
919         if (!skb)
920                 goto release;
921         skb->dev      = llc->dev;
922         skb->protocol = llc_proto_type(addr->sllc_arphrd);
923         skb_reserve(skb, hdrlen);
924         rc = memcpy_from_msg(skb_put(skb, copied), msg, copied);
925         if (rc)
926                 goto out;
927         if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) {
928                 llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac,
929                                           addr->sllc_sap);
930                 goto out;
931         }
932         if (addr->sllc_test) {
933                 llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
934                                             addr->sllc_sap);
935                 goto out;
936         }
937         if (addr->sllc_xid) {
938                 llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
939                                            addr->sllc_sap);
940                 goto out;
941         }
942         rc = -ENOPROTOOPT;
943         if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
944                 goto out;
945         rc = llc_ui_send_data(sk, skb, noblock);
946 out:
947         if (rc) {
948                 kfree_skb(skb);
949 release:
950                 dprintk("%s: failed sending from %02X to %02X: %d\n",
951                         __func__, llc->laddr.lsap, llc->daddr.lsap, rc);
952         }
953         release_sock(sk);
954         return rc ? : copied;
955 }
956 
957 /**
958  *      llc_ui_getname - return the address info of a socket
959  *      @sock: Socket to get address of.
960  *      @uaddr: Address structure to return information.
961  *      @uaddrlen: Length of address structure.
962  *      @peer: Does user want local or remote address information.
963  *
964  *      Return the address information of a socket.
965  */
966 static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
967                           int *uaddrlen, int peer)
968 {
969         struct sockaddr_llc sllc;
970         struct sock *sk = sock->sk;
971         struct llc_sock *llc = llc_sk(sk);
972         int rc = -EBADF;
973 
974         memset(&sllc, 0, sizeof(sllc));
975         lock_sock(sk);
976         if (sock_flag(sk, SOCK_ZAPPED))
977                 goto out;
978         *uaddrlen = sizeof(sllc);
979         if (peer) {
980                 rc = -ENOTCONN;
981                 if (sk->sk_state != TCP_ESTABLISHED)
982                         goto out;
983                 if(llc->dev)
984                         sllc.sllc_arphrd = llc->dev->type;
985                 sllc.sllc_sap = llc->daddr.lsap;
986                 memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
987         } else {
988                 rc = -EINVAL;
989                 if (!llc->sap)
990                         goto out;
991                 sllc.sllc_sap = llc->sap->laddr.lsap;
992 
993                 if (llc->dev) {
994                         sllc.sllc_arphrd = llc->dev->type;
995                         memcpy(&sllc.sllc_mac, llc->dev->dev_addr,
996                                IFHWADDRLEN);
997                 }
998         }
999         rc = 0;
1000         sllc.sllc_family = AF_LLC;
1001         memcpy(uaddr, &sllc, sizeof(sllc));
1002 out:
1003         release_sock(sk);
1004         return rc;
1005 }
1006 
1007 /**
1008  *      llc_ui_ioctl - io controls for PF_LLC
1009  *      @sock: Socket to get/set info
1010  *      @cmd: command
1011  *      @arg: optional argument for cmd
1012  *
1013  *      get/set info on llc sockets
1014  */
1015 static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
1016                         unsigned long arg)
1017 {
1018         return -ENOIOCTLCMD;
1019 }
1020 
1021 /**
1022  *      llc_ui_setsockopt - set various connection specific parameters.
1023  *      @sock: Socket to set options on.
1024  *      @level: Socket level user is requesting operations on.
1025  *      @optname: Operation name.
1026  *      @optval: User provided operation data.
1027  *      @optlen: Length of optval.
1028  *
1029  *      Set various connection specific parameters.
1030  */
1031 static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
1032                              char __user *optval, unsigned int optlen)
1033 {
1034         struct sock *sk = sock->sk;
1035         struct llc_sock *llc = llc_sk(sk);
1036         unsigned int opt;
1037         int rc = -EINVAL;
1038 
1039         lock_sock(sk);
1040         if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
1041                 goto out;
1042         rc = get_user(opt, (int __user *)optval);
1043         if (rc)
1044                 goto out;
1045         rc = -EINVAL;
1046         switch (optname) {
1047         case LLC_OPT_RETRY:
1048                 if (opt > LLC_OPT_MAX_RETRY)
1049                         goto out;
1050                 llc->n2 = opt;
1051                 break;
1052         case LLC_OPT_SIZE:
1053                 if (opt > LLC_OPT_MAX_SIZE)
1054                         goto out;
1055                 llc->n1 = opt;
1056                 break;
1057         case LLC_OPT_ACK_TMR_EXP:
1058                 if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
1059                         goto out;
1060                 llc->ack_timer.expire = opt * HZ;
1061                 break;
1062         case LLC_OPT_P_TMR_EXP:
1063                 if (opt > LLC_OPT_MAX_P_TMR_EXP)
1064                         goto out;
1065                 llc->pf_cycle_timer.expire = opt * HZ;
1066                 break;
1067         case LLC_OPT_REJ_TMR_EXP:
1068                 if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
1069                         goto out;
1070                 llc->rej_sent_timer.expire = opt * HZ;
1071                 break;
1072         case LLC_OPT_BUSY_TMR_EXP:
1073                 if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
1074                         goto out;
1075                 llc->busy_state_timer.expire = opt * HZ;
1076                 break;
1077         case LLC_OPT_TX_WIN:
1078                 if (opt > LLC_OPT_MAX_WIN)
1079                         goto out;
1080                 llc->k = opt;
1081                 break;
1082         case LLC_OPT_RX_WIN:
1083                 if (opt > LLC_OPT_MAX_WIN)
1084                         goto out;
1085                 llc->rw = opt;
1086                 break;
1087         case LLC_OPT_PKTINFO:
1088                 if (opt)
1089                         llc->cmsg_flags |= LLC_CMSG_PKTINFO;
1090                 else
1091                         llc->cmsg_flags &= ~LLC_CMSG_PKTINFO;
1092                 break;
1093         default:
1094                 rc = -ENOPROTOOPT;
1095                 goto out;
1096         }
1097         rc = 0;
1098 out:
1099         release_sock(sk);
1100         return rc;
1101 }
1102 
1103 /**
1104  *      llc_ui_getsockopt - get connection specific socket info
1105  *      @sock: Socket to get information from.
1106  *      @level: Socket level user is requesting operations on.
1107  *      @optname: Operation name.
1108  *      @optval: Variable to return operation data in.
1109  *      @optlen: Length of optval.
1110  *
1111  *      Get connection specific socket information.
1112  */
1113 static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
1114                              char __user *optval, int __user *optlen)
1115 {
1116         struct sock *sk = sock->sk;
1117         struct llc_sock *llc = llc_sk(sk);
1118         int val = 0, len = 0, rc = -EINVAL;
1119 
1120         lock_sock(sk);
1121         if (unlikely(level != SOL_LLC))
1122                 goto out;
1123         rc = get_user(len, optlen);
1124         if (rc)
1125                 goto out;
1126         rc = -EINVAL;
1127         if (len != sizeof(int))
1128                 goto out;
1129         switch (optname) {
1130         case LLC_OPT_RETRY:
1131                 val = llc->n2;                                  break;
1132         case LLC_OPT_SIZE:
1133                 val = llc->n1;                                  break;
1134         case LLC_OPT_ACK_TMR_EXP:
1135                 val = llc->ack_timer.expire / HZ;               break;
1136         case LLC_OPT_P_TMR_EXP:
1137                 val = llc->pf_cycle_timer.expire / HZ;          break;
1138         case LLC_OPT_REJ_TMR_EXP:
1139                 val = llc->rej_sent_timer.expire / HZ;          break;
1140         case LLC_OPT_BUSY_TMR_EXP:
1141                 val = llc->busy_state_timer.expire / HZ;        break;
1142         case LLC_OPT_TX_WIN:
1143                 val = llc->k;                           break;
1144         case LLC_OPT_RX_WIN:
1145                 val = llc->rw;                          break;
1146         case LLC_OPT_PKTINFO:
1147                 val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0;
1148                 break;
1149         default:
1150                 rc = -ENOPROTOOPT;
1151                 goto out;
1152         }
1153         rc = 0;
1154         if (put_user(len, optlen) || copy_to_user(optval, &val, len))
1155                 rc = -EFAULT;
1156 out:
1157         release_sock(sk);
1158         return rc;
1159 }
1160 
1161 static const struct net_proto_family llc_ui_family_ops = {
1162         .family = PF_LLC,
1163         .create = llc_ui_create,
1164         .owner  = THIS_MODULE,
1165 };
1166 
1167 static const struct proto_ops llc_ui_ops = {
1168         .family      = PF_LLC,
1169         .owner       = THIS_MODULE,
1170         .release     = llc_ui_release,
1171         .bind        = llc_ui_bind,
1172         .connect     = llc_ui_connect,
1173         .socketpair  = sock_no_socketpair,
1174         .accept      = llc_ui_accept,
1175         .getname     = llc_ui_getname,
1176         .poll        = datagram_poll,
1177         .ioctl       = llc_ui_ioctl,
1178         .listen      = llc_ui_listen,
1179         .shutdown    = llc_ui_shutdown,
1180         .setsockopt  = llc_ui_setsockopt,
1181         .getsockopt  = llc_ui_getsockopt,
1182         .sendmsg     = llc_ui_sendmsg,
1183         .recvmsg     = llc_ui_recvmsg,
1184         .mmap        = sock_no_mmap,
1185         .sendpage    = sock_no_sendpage,
1186 };
1187 
1188 static const char llc_proc_err_msg[] __initconst =
1189         KERN_CRIT "LLC: Unable to register the proc_fs entries\n";
1190 static const char llc_sysctl_err_msg[] __initconst =
1191         KERN_CRIT "LLC: Unable to register the sysctl entries\n";
1192 static const char llc_sock_err_msg[] __initconst =
1193         KERN_CRIT "LLC: Unable to register the network family\n";
1194 
1195 static int __init llc2_init(void)
1196 {
1197         int rc = proto_register(&llc_proto, 0);
1198 
1199         if (rc != 0)
1200                 goto out;
1201 
1202         llc_build_offset_table();
1203         llc_station_init();
1204         llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
1205         rc = llc_proc_init();
1206         if (rc != 0) {
1207                 printk(llc_proc_err_msg);
1208                 goto out_station;
1209         }
1210         rc = llc_sysctl_init();
1211         if (rc) {
1212                 printk(llc_sysctl_err_msg);
1213                 goto out_proc;
1214         }
1215         rc = sock_register(&llc_ui_family_ops);
1216         if (rc) {
1217                 printk(llc_sock_err_msg);
1218                 goto out_sysctl;
1219         }
1220         llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
1221         llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
1222 out:
1223         return rc;
1224 out_sysctl:
1225         llc_sysctl_exit();
1226 out_proc:
1227         llc_proc_exit();
1228 out_station:
1229         llc_station_exit();
1230         proto_unregister(&llc_proto);
1231         goto out;
1232 }
1233 
1234 static void __exit llc2_exit(void)
1235 {
1236         llc_station_exit();
1237         llc_remove_pack(LLC_DEST_SAP);
1238         llc_remove_pack(LLC_DEST_CONN);
1239         sock_unregister(PF_LLC);
1240         llc_proc_exit();
1241         llc_sysctl_exit();
1242         proto_unregister(&llc_proto);
1243 }
1244 
1245 module_init(llc2_init);
1246 module_exit(llc2_exit);
1247 
1248 MODULE_LICENSE("GPL");
1249 MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1250 MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1251 MODULE_ALIAS_NETPROTO(PF_LLC);
1252 

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