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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 <linux/sched/signal.h>
 30 
 31 #include <net/llc.h>
 32 #include <net/llc_sap.h>
 33 #include <net/llc_pdu.h>
 34 #include <net/llc_conn.h>
 35 #include <net/tcp_states.h>
 36 
 37 /* remember: uninitialized global data is zeroed because its in .bss */
 38 static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
 39 static u16 llc_ui_sap_link_no_max[256];
 40 static struct sockaddr_llc llc_ui_addrnull;
 41 static const struct proto_ops llc_ui_ops;
 42 
 43 static bool llc_ui_wait_for_conn(struct sock *sk, long timeout);
 44 static int llc_ui_wait_for_disc(struct sock *sk, long timeout);
 45 static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout);
 46 
 47 #if 0
 48 #define dprintk(args...) printk(KERN_DEBUG args)
 49 #else
 50 #define dprintk(args...)
 51 #endif
 52 
 53 /* Maybe we'll add some more in the future. */
 54 #define LLC_CMSG_PKTINFO        1
 55 
 56 
 57 /**
 58  *      llc_ui_next_link_no - return the next unused link number for a sap
 59  *      @sap: Address of sap to get link number from.
 60  *
 61  *      Return the next unused link number for a given sap.
 62  */
 63 static inline u16 llc_ui_next_link_no(int sap)
 64 {
 65         return llc_ui_sap_link_no_max[sap]++;
 66 }
 67 
 68 /**
 69  *      llc_proto_type - return eth protocol for ARP header type
 70  *      @arphrd: ARP header type.
 71  *
 72  *      Given an ARP header type return the corresponding ethernet protocol.
 73  */
 74 static inline __be16 llc_proto_type(u16 arphrd)
 75 {
 76         return htons(ETH_P_802_2);
 77 }
 78 
 79 /**
 80  *      llc_ui_addr_null - determines if a address structure is null
 81  *      @addr: Address to test if null.
 82  */
 83 static inline u8 llc_ui_addr_null(struct sockaddr_llc *addr)
 84 {
 85         return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr));
 86 }
 87 
 88 /**
 89  *      llc_ui_header_len - return length of llc header based on operation
 90  *      @sk: Socket which contains a valid llc socket type.
 91  *      @addr: Complete sockaddr_llc structure received from the user.
 92  *
 93  *      Provide the length of the llc header depending on what kind of
 94  *      operation the user would like to perform and the type of socket.
 95  *      Returns the correct llc header length.
 96  */
 97 static inline u8 llc_ui_header_len(struct sock *sk, struct sockaddr_llc *addr)
 98 {
 99         u8 rc = LLC_PDU_LEN_U;
100 
101         if (addr->sllc_test || addr->sllc_xid)
102                 rc = LLC_PDU_LEN_U;
103         else if (sk->sk_type == SOCK_STREAM)
104                 rc = LLC_PDU_LEN_I;
105         return rc;
106 }
107 
108 /**
109  *      llc_ui_send_data - send data via reliable llc2 connection
110  *      @sk: Connection the socket is using.
111  *      @skb: Data the user wishes to send.
112  *      @noblock: can we block waiting for data?
113  *
114  *      Send data via reliable llc2 connection.
115  *      Returns 0 upon success, non-zero if action did not succeed.
116  */
117 static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock)
118 {
119         struct llc_sock* llc = llc_sk(sk);
120         int rc = 0;
121 
122         if (unlikely(llc_data_accept_state(llc->state) ||
123                      llc->remote_busy_flag ||
124                      llc->p_flag)) {
125                 long timeout = sock_sndtimeo(sk, noblock);
126 
127                 rc = llc_ui_wait_for_busy_core(sk, timeout);
128         }
129         if (unlikely(!rc))
130                 rc = llc_build_and_send_pkt(sk, skb);
131         return rc;
132 }
133 
134 static void llc_ui_sk_init(struct socket *sock, struct sock *sk)
135 {
136         sock_graft(sk, sock);
137         sk->sk_type     = sock->type;
138         sock->ops       = &llc_ui_ops;
139 }
140 
141 static struct proto llc_proto = {
142         .name     = "LLC",
143         .owner    = THIS_MODULE,
144         .obj_size = sizeof(struct llc_sock),
145         .slab_flags = SLAB_TYPESAFE_BY_RCU,
146 };
147 
148 /**
149  *      llc_ui_create - alloc and init a new llc_ui socket
150  *      @net: network namespace (must be default network)
151  *      @sock: Socket to initialize and attach allocated sk to.
152  *      @protocol: Unused.
153  *      @kern: on behalf of kernel or userspace
154  *
155  *      Allocate and initialize a new llc_ui socket, validate the user wants a
156  *      socket type we have available.
157  *      Returns 0 upon success, negative upon failure.
158  */
159 static int llc_ui_create(struct net *net, struct socket *sock, int protocol,
160                          int kern)
161 {
162         struct sock *sk;
163         int rc = -ESOCKTNOSUPPORT;
164 
165         if (!ns_capable(net->user_ns, CAP_NET_RAW))
166                 return -EPERM;
167 
168         if (!net_eq(net, &init_net))
169                 return -EAFNOSUPPORT;
170 
171         if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) {
172                 rc = -ENOMEM;
173                 sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto, kern);
174                 if (sk) {
175                         rc = 0;
176                         llc_ui_sk_init(sock, sk);
177                 }
178         }
179         return rc;
180 }
181 
182 /**
183  *      llc_ui_release - shutdown socket
184  *      @sock: Socket to release.
185  *
186  *      Shutdown and deallocate an existing socket.
187  */
188 static int llc_ui_release(struct socket *sock)
189 {
190         struct sock *sk = sock->sk;
191         struct llc_sock *llc;
192 
193         if (unlikely(sk == NULL))
194                 goto out;
195         sock_hold(sk);
196         lock_sock(sk);
197         llc = llc_sk(sk);
198         dprintk("%s: closing local(%02X) remote(%02X)\n", __func__,
199                 llc->laddr.lsap, llc->daddr.lsap);
200         if (!llc_send_disc(sk))
201                 llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
202         if (!sock_flag(sk, SOCK_ZAPPED))
203                 llc_sap_remove_socket(llc->sap, sk);
204         release_sock(sk);
205         if (llc->dev)
206                 dev_put(llc->dev);
207         sock_put(sk);
208         llc_sk_free(sk);
209 out:
210         return 0;
211 }
212 
213 /**
214  *      llc_ui_autoport - provide dynamically allocate SAP number
215  *
216  *      Provide the caller with a dynamically allocated SAP number according
217  *      to the rules that are set in this function. Returns: 0, upon failure,
218  *      SAP number otherwise.
219  */
220 static int llc_ui_autoport(void)
221 {
222         struct llc_sap *sap;
223         int i, tries = 0;
224 
225         while (tries < LLC_SAP_DYN_TRIES) {
226                 for (i = llc_ui_sap_last_autoport;
227                      i < LLC_SAP_DYN_STOP; i += 2) {
228                         sap = llc_sap_find(i);
229                         if (!sap) {
230                                 llc_ui_sap_last_autoport = i + 2;
231                                 goto out;
232                         }
233                         llc_sap_put(sap);
234                 }
235                 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
236                 tries++;
237         }
238         i = 0;
239 out:
240         return i;
241 }
242 
243 /**
244  *      llc_ui_autobind - automatically bind a socket to a sap
245  *      @sock: socket to bind
246  *      @addr: address to connect to
247  *
248  *      Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't
249  *      specifically used llc_ui_bind to bind to an specific address/sap
250  *
251  *      Returns: 0 upon success, negative otherwise.
252  */
253 static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
254 {
255         struct sock *sk = sock->sk;
256         struct llc_sock *llc = llc_sk(sk);
257         struct llc_sap *sap;
258         int rc = -EINVAL;
259 
260         if (!sock_flag(sk, SOCK_ZAPPED))
261                 goto out;
262         rc = -ENODEV;
263         if (sk->sk_bound_dev_if) {
264                 llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
265                 if (llc->dev && addr->sllc_arphrd != llc->dev->type) {
266                         dev_put(llc->dev);
267                         llc->dev = NULL;
268                 }
269         } else
270                 llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd);
271         if (!llc->dev)
272                 goto out;
273         rc = -EUSERS;
274         llc->laddr.lsap = llc_ui_autoport();
275         if (!llc->laddr.lsap)
276                 goto out;
277         rc = -EBUSY; /* some other network layer is using the sap */
278         sap = llc_sap_open(llc->laddr.lsap, NULL);
279         if (!sap)
280                 goto out;
281         memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN);
282         memcpy(&llc->addr, addr, sizeof(llc->addr));
283         /* assign new connection to its SAP */
284         llc_sap_add_socket(sap, sk);
285         sock_reset_flag(sk, SOCK_ZAPPED);
286         rc = 0;
287 out:
288         return rc;
289 }
290 
291 /**
292  *      llc_ui_bind - bind a socket to a specific address.
293  *      @sock: Socket to bind an address to.
294  *      @uaddr: Address the user wants the socket bound to.
295  *      @addrlen: Length of the uaddr structure.
296  *
297  *      Bind a socket to a specific address. For llc a user is able to bind to
298  *      a specific sap only or mac + sap.
299  *      If the user desires to bind to a specific mac + sap, it is possible to
300  *      have multiple sap connections via multiple macs.
301  *      Bind and autobind for that matter must enforce the correct sap usage
302  *      otherwise all hell will break loose.
303  *      Returns: 0 upon success, negative otherwise.
304  */
305 static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
306 {
307         struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
308         struct sock *sk = sock->sk;
309         struct llc_sock *llc = llc_sk(sk);
310         struct llc_sap *sap;
311         int rc = -EINVAL;
312 
313         dprintk("%s: binding %02X\n", __func__, addr->sllc_sap);
314 
315         lock_sock(sk);
316         if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)))
317                 goto out;
318         rc = -EAFNOSUPPORT;
319         if (unlikely(addr->sllc_family != AF_LLC))
320                 goto out;
321         rc = -ENODEV;
322         rcu_read_lock();
323         if (sk->sk_bound_dev_if) {
324                 llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if);
325                 if (llc->dev) {
326                         if (!addr->sllc_arphrd)
327                                 addr->sllc_arphrd = llc->dev->type;
328                         if (is_zero_ether_addr(addr->sllc_mac))
329                                 memcpy(addr->sllc_mac, llc->dev->dev_addr,
330                                        IFHWADDRLEN);
331                         if (addr->sllc_arphrd != llc->dev->type ||
332                             !ether_addr_equal(addr->sllc_mac,
333                                               llc->dev->dev_addr)) {
334                                 rc = -EINVAL;
335                                 llc->dev = NULL;
336                         }
337                 }
338         } else
339                 llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd,
340                                            addr->sllc_mac);
341         if (llc->dev)
342                 dev_hold(llc->dev);
343         rcu_read_unlock();
344         if (!llc->dev)
345                 goto out;
346         if (!addr->sllc_sap) {
347                 rc = -EUSERS;
348                 addr->sllc_sap = llc_ui_autoport();
349                 if (!addr->sllc_sap)
350                         goto out;
351         }
352         sap = llc_sap_find(addr->sllc_sap);
353         if (!sap) {
354                 sap = llc_sap_open(addr->sllc_sap, NULL);
355                 rc = -EBUSY; /* some other network layer is using the sap */
356                 if (!sap)
357                         goto out;
358         } else {
359                 struct llc_addr laddr, daddr;
360                 struct sock *ask;
361 
362                 memset(&laddr, 0, sizeof(laddr));
363                 memset(&daddr, 0, sizeof(daddr));
364                 /*
365                  * FIXME: check if the address is multicast,
366                  *        only SOCK_DGRAM can do this.
367                  */
368                 memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
369                 laddr.lsap = addr->sllc_sap;
370                 rc = -EADDRINUSE; /* mac + sap clash. */
371                 ask = llc_lookup_established(sap, &daddr, &laddr);
372                 if (ask) {
373                         sock_put(ask);
374                         goto out_put;
375                 }
376         }
377         llc->laddr.lsap = addr->sllc_sap;
378         memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN);
379         memcpy(&llc->addr, addr, sizeof(llc->addr));
380         /* assign new connection to its SAP */
381         llc_sap_add_socket(sap, sk);
382         sock_reset_flag(sk, SOCK_ZAPPED);
383         rc = 0;
384 out_put:
385         llc_sap_put(sap);
386 out:
387         release_sock(sk);
388         return rc;
389 }
390 
391 /**
392  *      llc_ui_shutdown - shutdown a connect llc2 socket.
393  *      @sock: Socket to shutdown.
394  *      @how: What part of the socket to shutdown.
395  *
396  *      Shutdown a connected llc2 socket. Currently this function only supports
397  *      shutting down both sends and receives (2), we could probably make this
398  *      function such that a user can shutdown only half the connection but not
399  *      right now.
400  *      Returns: 0 upon success, negative otherwise.
401  */
402 static int llc_ui_shutdown(struct socket *sock, int how)
403 {
404         struct sock *sk = sock->sk;
405         int rc = -ENOTCONN;
406 
407         lock_sock(sk);
408         if (unlikely(sk->sk_state != TCP_ESTABLISHED))
409                 goto out;
410         rc = -EINVAL;
411         if (how != 2)
412                 goto out;
413         rc = llc_send_disc(sk);
414         if (!rc)
415                 rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
416         /* Wake up anyone sleeping in poll */
417         sk->sk_state_change(sk);
418 out:
419         release_sock(sk);
420         return rc;
421 }
422 
423 /**
424  *      llc_ui_connect - Connect to a remote llc2 mac + sap.
425  *      @sock: Socket which will be connected to the remote destination.
426  *      @uaddr: Remote and possibly the local address of the new connection.
427  *      @addrlen: Size of uaddr structure.
428  *      @flags: Operational flags specified by the user.
429  *
430  *      Connect to a remote llc2 mac + sap. The caller must specify the
431  *      destination mac and address to connect to. If the user hasn't previously
432  *      called bind(2) with a smac the address of the first interface of the
433  *      specified arp type will be used.
434  *      This function will autobind if user did not previously call bind.
435  *      Returns: 0 upon success, negative otherwise.
436  */
437 static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
438                           int addrlen, int flags)
439 {
440         struct sock *sk = sock->sk;
441         struct llc_sock *llc = llc_sk(sk);
442         struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
443         int rc = -EINVAL;
444 
445         lock_sock(sk);
446         if (unlikely(addrlen != sizeof(*addr)))
447                 goto out;
448         rc = -EAFNOSUPPORT;
449         if (unlikely(addr->sllc_family != AF_LLC))
450                 goto out;
451         if (unlikely(sk->sk_type != SOCK_STREAM))
452                 goto out;
453         rc = -EALREADY;
454         if (unlikely(sock->state == SS_CONNECTING))
455                 goto out;
456         /* bind connection to sap if user hasn't done it. */
457         if (sock_flag(sk, SOCK_ZAPPED)) {
458                 /* bind to sap with null dev, exclusive */
459                 rc = llc_ui_autobind(sock, addr);
460                 if (rc)
461                         goto out;
462         }
463         llc->daddr.lsap = addr->sllc_sap;
464         memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
465         sock->state = SS_CONNECTING;
466         sk->sk_state   = TCP_SYN_SENT;
467         llc->link   = llc_ui_next_link_no(llc->sap->laddr.lsap);
468         rc = llc_establish_connection(sk, llc->dev->dev_addr,
469                                       addr->sllc_mac, addr->sllc_sap);
470         if (rc) {
471                 dprintk("%s: llc_ui_send_conn failed :-(\n", __func__);
472                 sock->state  = SS_UNCONNECTED;
473                 sk->sk_state = TCP_CLOSE;
474                 goto out;
475         }
476 
477         if (sk->sk_state == TCP_SYN_SENT) {
478                 const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
479 
480                 if (!timeo || !llc_ui_wait_for_conn(sk, timeo))
481                         goto out;
482 
483                 rc = sock_intr_errno(timeo);
484                 if (signal_pending(current))
485                         goto out;
486         }
487 
488         if (sk->sk_state == TCP_CLOSE)
489                 goto sock_error;
490 
491         sock->state = SS_CONNECTED;
492         rc = 0;
493 out:
494         release_sock(sk);
495         return rc;
496 sock_error:
497         rc = sock_error(sk) ? : -ECONNABORTED;
498         sock->state = SS_UNCONNECTED;
499         goto out;
500 }
501 
502 /**
503  *      llc_ui_listen - allow a normal socket to accept incoming connections
504  *      @sock: Socket to allow incoming connections on.
505  *      @backlog: Number of connections to queue.
506  *
507  *      Allow a normal socket to accept incoming connections.
508  *      Returns 0 upon success, negative otherwise.
509  */
510 static int llc_ui_listen(struct socket *sock, int backlog)
511 {
512         struct sock *sk = sock->sk;
513         int rc = -EINVAL;
514 
515         lock_sock(sk);
516         if (unlikely(sock->state != SS_UNCONNECTED))
517                 goto out;
518         rc = -EOPNOTSUPP;
519         if (unlikely(sk->sk_type != SOCK_STREAM))
520                 goto out;
521         rc = -EAGAIN;
522         if (sock_flag(sk, SOCK_ZAPPED))
523                 goto out;
524         rc = 0;
525         if (!(unsigned int)backlog)     /* BSDism */
526                 backlog = 1;
527         sk->sk_max_ack_backlog = backlog;
528         if (sk->sk_state != TCP_LISTEN) {
529                 sk->sk_ack_backlog = 0;
530                 sk->sk_state       = TCP_LISTEN;
531         }
532         sk->sk_socket->flags |= __SO_ACCEPTCON;
533 out:
534         release_sock(sk);
535         return rc;
536 }
537 
538 static int llc_ui_wait_for_disc(struct sock *sk, long timeout)
539 {
540         DEFINE_WAIT_FUNC(wait, woken_wake_function);
541         int rc = 0;
542 
543         add_wait_queue(sk_sleep(sk), &wait);
544         while (1) {
545                 if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE, &wait))
546                         break;
547                 rc = -ERESTARTSYS;
548                 if (signal_pending(current))
549                         break;
550                 rc = -EAGAIN;
551                 if (!timeout)
552                         break;
553                 rc = 0;
554         }
555         remove_wait_queue(sk_sleep(sk), &wait);
556         return rc;
557 }
558 
559 static bool llc_ui_wait_for_conn(struct sock *sk, long timeout)
560 {
561         DEFINE_WAIT_FUNC(wait, woken_wake_function);
562 
563         add_wait_queue(sk_sleep(sk), &wait);
564         while (1) {
565                 if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT, &wait))
566                         break;
567                 if (signal_pending(current) || !timeout)
568                         break;
569         }
570         remove_wait_queue(sk_sleep(sk), &wait);
571         return timeout;
572 }
573 
574 static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout)
575 {
576         DEFINE_WAIT_FUNC(wait, woken_wake_function);
577         struct llc_sock *llc = llc_sk(sk);
578         int rc;
579 
580         add_wait_queue(sk_sleep(sk), &wait);
581         while (1) {
582                 rc = 0;
583                 if (sk_wait_event(sk, &timeout,
584                                   (sk->sk_shutdown & RCV_SHUTDOWN) ||
585                                   (!llc_data_accept_state(llc->state) &&
586                                    !llc->remote_busy_flag &&
587                                    !llc->p_flag), &wait))
588                         break;
589                 rc = -ERESTARTSYS;
590                 if (signal_pending(current))
591                         break;
592                 rc = -EAGAIN;
593                 if (!timeout)
594                         break;
595         }
596         remove_wait_queue(sk_sleep(sk), &wait);
597         return rc;
598 }
599 
600 static int llc_wait_data(struct sock *sk, long timeo)
601 {
602         int rc;
603 
604         while (1) {
605                 /*
606                  * POSIX 1003.1g mandates this order.
607                  */
608                 rc = sock_error(sk);
609                 if (rc)
610                         break;
611                 rc = 0;
612                 if (sk->sk_shutdown & RCV_SHUTDOWN)
613                         break;
614                 rc = -EAGAIN;
615                 if (!timeo)
616                         break;
617                 rc = sock_intr_errno(timeo);
618                 if (signal_pending(current))
619                         break;
620                 rc = 0;
621                 if (sk_wait_data(sk, &timeo, NULL))
622                         break;
623         }
624         return rc;
625 }
626 
627 static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb)
628 {
629         struct llc_sock *llc = llc_sk(skb->sk);
630 
631         if (llc->cmsg_flags & LLC_CMSG_PKTINFO) {
632                 struct llc_pktinfo info;
633 
634                 memset(&info, 0, sizeof(info));
635                 info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex;
636                 llc_pdu_decode_dsap(skb, &info.lpi_sap);
637                 llc_pdu_decode_da(skb, info.lpi_mac);
638                 put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info);
639         }
640 }
641 
642 /**
643  *      llc_ui_accept - accept a new incoming connection.
644  *      @sock: Socket which connections arrive on.
645  *      @newsock: Socket to move incoming connection to.
646  *      @flags: User specified operational flags.
647  *      @kern: If the socket is kernel internal
648  *
649  *      Accept a new incoming connection.
650  *      Returns 0 upon success, negative otherwise.
651  */
652 static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags,
653                          bool kern)
654 {
655         struct sock *sk = sock->sk, *newsk;
656         struct llc_sock *llc, *newllc;
657         struct sk_buff *skb;
658         int rc = -EOPNOTSUPP;
659 
660         dprintk("%s: accepting on %02X\n", __func__,
661                 llc_sk(sk)->laddr.lsap);
662         lock_sock(sk);
663         if (unlikely(sk->sk_type != SOCK_STREAM))
664                 goto out;
665         rc = -EINVAL;
666         if (unlikely(sock->state != SS_UNCONNECTED ||
667                      sk->sk_state != TCP_LISTEN))
668                 goto out;
669         /* wait for a connection to arrive. */
670         if (skb_queue_empty(&sk->sk_receive_queue)) {
671                 rc = llc_wait_data(sk, sk->sk_rcvtimeo);
672                 if (rc)
673                         goto out;
674         }
675         dprintk("%s: got a new connection on %02X\n", __func__,
676                 llc_sk(sk)->laddr.lsap);
677         skb = skb_dequeue(&sk->sk_receive_queue);
678         rc = -EINVAL;
679         if (!skb->sk)
680                 goto frees;
681         rc = 0;
682         newsk = skb->sk;
683         /* attach connection to a new socket. */
684         llc_ui_sk_init(newsock, newsk);
685         sock_reset_flag(newsk, SOCK_ZAPPED);
686         newsk->sk_state         = TCP_ESTABLISHED;
687         newsock->state          = SS_CONNECTED;
688         llc                     = llc_sk(sk);
689         newllc                  = llc_sk(newsk);
690         memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr));
691         newllc->link = llc_ui_next_link_no(newllc->laddr.lsap);
692 
693         /* put original socket back into a clean listen state. */
694         sk->sk_state = TCP_LISTEN;
695         sk->sk_ack_backlog--;
696         dprintk("%s: ok success on %02X, client on %02X\n", __func__,
697                 llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
698 frees:
699         kfree_skb(skb);
700 out:
701         release_sock(sk);
702         return rc;
703 }
704 
705 /**
706  *      llc_ui_recvmsg - copy received data to the socket user.
707  *      @sock: Socket to copy data from.
708  *      @msg: Various user space related information.
709  *      @len: Size of user buffer.
710  *      @flags: User specified flags.
711  *
712  *      Copy received data to the socket user.
713  *      Returns non-negative upon success, negative otherwise.
714  */
715 static int llc_ui_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
716                           int flags)
717 {
718         DECLARE_SOCKADDR(struct sockaddr_llc *, uaddr, msg->msg_name);
719         const int nonblock = flags & MSG_DONTWAIT;
720         struct sk_buff *skb = NULL;
721         struct sock *sk = sock->sk;
722         struct llc_sock *llc = llc_sk(sk);
723         unsigned long cpu_flags;
724         size_t copied = 0;
725         u32 peek_seq = 0;
726         u32 *seq, skb_len;
727         unsigned long used;
728         int target;     /* Read at least this many bytes */
729         long timeo;
730 
731         lock_sock(sk);
732         copied = -ENOTCONN;
733         if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN))
734                 goto out;
735 
736         timeo = sock_rcvtimeo(sk, nonblock);
737 
738         seq = &llc->copied_seq;
739         if (flags & MSG_PEEK) {
740                 peek_seq = llc->copied_seq;
741                 seq = &peek_seq;
742         }
743 
744         target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
745         copied = 0;
746 
747         do {
748                 u32 offset;
749 
750                 /*
751                  * We need to check signals first, to get correct SIGURG
752                  * handling. FIXME: Need to check this doesn't impact 1003.1g
753                  * and move it down to the bottom of the loop
754                  */
755                 if (signal_pending(current)) {
756                         if (copied)
757                                 break;
758                         copied = timeo ? sock_intr_errno(timeo) : -EAGAIN;
759                         break;
760                 }
761 
762                 /* Next get a buffer. */
763 
764                 skb = skb_peek(&sk->sk_receive_queue);
765                 if (skb) {
766                         offset = *seq;
767                         goto found_ok_skb;
768                 }
769                 /* Well, if we have backlog, try to process it now yet. */
770 
771                 if (copied >= target && !sk->sk_backlog.tail)
772                         break;
773 
774                 if (copied) {
775                         if (sk->sk_err ||
776                             sk->sk_state == TCP_CLOSE ||
777                             (sk->sk_shutdown & RCV_SHUTDOWN) ||
778                             !timeo ||
779                             (flags & MSG_PEEK))
780                                 break;
781                 } else {
782                         if (sock_flag(sk, SOCK_DONE))
783                                 break;
784 
785                         if (sk->sk_err) {
786                                 copied = sock_error(sk);
787                                 break;
788                         }
789                         if (sk->sk_shutdown & RCV_SHUTDOWN)
790                                 break;
791 
792                         if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) {
793                                 if (!sock_flag(sk, SOCK_DONE)) {
794                                         /*
795                                          * This occurs when user tries to read
796                                          * from never connected socket.
797                                          */
798                                         copied = -ENOTCONN;
799                                         break;
800                                 }
801                                 break;
802                         }
803                         if (!timeo) {
804                                 copied = -EAGAIN;
805                                 break;
806                         }
807                 }
808 
809                 if (copied >= target) { /* Do not sleep, just process backlog. */
810                         release_sock(sk);
811                         lock_sock(sk);
812                 } else
813                         sk_wait_data(sk, &timeo, NULL);
814 
815                 if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) {
816                         net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n",
817                                             current->comm,
818                                             task_pid_nr(current));
819                         peek_seq = llc->copied_seq;
820                 }
821                 continue;
822         found_ok_skb:
823                 skb_len = skb->len;
824                 /* Ok so how much can we use? */
825                 used = skb->len - offset;
826                 if (len < used)
827                         used = len;
828 
829                 if (!(flags & MSG_TRUNC)) {
830                         int rc = skb_copy_datagram_msg(skb, offset, msg, used);
831                         if (rc) {
832                                 /* Exception. Bailout! */
833                                 if (!copied)
834                                         copied = -EFAULT;
835                                 break;
836                         }
837                 }
838 
839                 *seq += used;
840                 copied += used;
841                 len -= used;
842 
843                 /* For non stream protcols we get one packet per recvmsg call */
844                 if (sk->sk_type != SOCK_STREAM)
845                         goto copy_uaddr;
846 
847                 if (!(flags & MSG_PEEK)) {
848                         spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags);
849                         sk_eat_skb(sk, skb);
850                         spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags);
851                         *seq = 0;
852                 }
853 
854                 /* Partial read */
855                 if (used + offset < skb_len)
856                         continue;
857         } while (len > 0);
858 
859 out:
860         release_sock(sk);
861         return copied;
862 copy_uaddr:
863         if (uaddr != NULL && skb != NULL) {
864                 memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
865                 msg->msg_namelen = sizeof(*uaddr);
866         }
867         if (llc_sk(sk)->cmsg_flags)
868                 llc_cmsg_rcv(msg, skb);
869 
870         if (!(flags & MSG_PEEK)) {
871                 spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags);
872                 sk_eat_skb(sk, skb);
873                 spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags);
874                 *seq = 0;
875         }
876 
877         goto out;
878 }
879 
880 /**
881  *      llc_ui_sendmsg - Transmit data provided by the socket user.
882  *      @sock: Socket to transmit data from.
883  *      @msg: Various user related information.
884  *      @len: Length of data to transmit.
885  *
886  *      Transmit data provided by the socket user.
887  *      Returns non-negative upon success, negative otherwise.
888  */
889 static int llc_ui_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
890 {
891         struct sock *sk = sock->sk;
892         struct llc_sock *llc = llc_sk(sk);
893         DECLARE_SOCKADDR(struct sockaddr_llc *, addr, msg->msg_name);
894         int flags = msg->msg_flags;
895         int noblock = flags & MSG_DONTWAIT;
896         struct sk_buff *skb;
897         size_t size = 0;
898         int rc = -EINVAL, copied = 0, hdrlen;
899 
900         dprintk("%s: sending from %02X to %02X\n", __func__,
901                 llc->laddr.lsap, llc->daddr.lsap);
902         lock_sock(sk);
903         if (addr) {
904                 if (msg->msg_namelen < sizeof(*addr))
905                         goto release;
906         } else {
907                 if (llc_ui_addr_null(&llc->addr))
908                         goto release;
909                 addr = &llc->addr;
910         }
911         /* must bind connection to sap if user hasn't done it. */
912         if (sock_flag(sk, SOCK_ZAPPED)) {
913                 /* bind to sap with null dev, exclusive. */
914                 rc = llc_ui_autobind(sock, addr);
915                 if (rc)
916                         goto release;
917         }
918         hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr);
919         size = hdrlen + len;
920         if (size > llc->dev->mtu)
921                 size = llc->dev->mtu;
922         copied = size - hdrlen;
923         release_sock(sk);
924         skb = sock_alloc_send_skb(sk, size, noblock, &rc);
925         lock_sock(sk);
926         if (!skb)
927                 goto release;
928         skb->dev      = llc->dev;
929         skb->protocol = llc_proto_type(addr->sllc_arphrd);
930         skb_reserve(skb, hdrlen);
931         rc = memcpy_from_msg(skb_put(skb, copied), msg, copied);
932         if (rc)
933                 goto out;
934         if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) {
935                 llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac,
936                                           addr->sllc_sap);
937                 goto out;
938         }
939         if (addr->sllc_test) {
940                 llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
941                                             addr->sllc_sap);
942                 goto out;
943         }
944         if (addr->sllc_xid) {
945                 llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
946                                            addr->sllc_sap);
947                 goto out;
948         }
949         rc = -ENOPROTOOPT;
950         if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
951                 goto out;
952         rc = llc_ui_send_data(sk, skb, noblock);
953 out:
954         if (rc) {
955                 kfree_skb(skb);
956 release:
957                 dprintk("%s: failed sending from %02X to %02X: %d\n",
958                         __func__, llc->laddr.lsap, llc->daddr.lsap, rc);
959         }
960         release_sock(sk);
961         return rc ? : copied;
962 }
963 
964 /**
965  *      llc_ui_getname - return the address info of a socket
966  *      @sock: Socket to get address of.
967  *      @uaddr: Address structure to return information.
968  *      @uaddrlen: Length of address structure.
969  *      @peer: Does user want local or remote address information.
970  *
971  *      Return the address information of a socket.
972  */
973 static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
974                           int *uaddrlen, int peer)
975 {
976         struct sockaddr_llc sllc;
977         struct sock *sk = sock->sk;
978         struct llc_sock *llc = llc_sk(sk);
979         int rc = -EBADF;
980 
981         memset(&sllc, 0, sizeof(sllc));
982         lock_sock(sk);
983         if (sock_flag(sk, SOCK_ZAPPED))
984                 goto out;
985         *uaddrlen = sizeof(sllc);
986         if (peer) {
987                 rc = -ENOTCONN;
988                 if (sk->sk_state != TCP_ESTABLISHED)
989                         goto out;
990                 if(llc->dev)
991                         sllc.sllc_arphrd = llc->dev->type;
992                 sllc.sllc_sap = llc->daddr.lsap;
993                 memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
994         } else {
995                 rc = -EINVAL;
996                 if (!llc->sap)
997                         goto out;
998                 sllc.sllc_sap = llc->sap->laddr.lsap;
999 
1000                 if (llc->dev) {
1001                         sllc.sllc_arphrd = llc->dev->type;
1002                         memcpy(&sllc.sllc_mac, llc->dev->dev_addr,
1003                                IFHWADDRLEN);
1004                 }
1005         }
1006         rc = 0;
1007         sllc.sllc_family = AF_LLC;
1008         memcpy(uaddr, &sllc, sizeof(sllc));
1009 out:
1010         release_sock(sk);
1011         return rc;
1012 }
1013 
1014 /**
1015  *      llc_ui_ioctl - io controls for PF_LLC
1016  *      @sock: Socket to get/set info
1017  *      @cmd: command
1018  *      @arg: optional argument for cmd
1019  *
1020  *      get/set info on llc sockets
1021  */
1022 static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
1023                         unsigned long arg)
1024 {
1025         return -ENOIOCTLCMD;
1026 }
1027 
1028 /**
1029  *      llc_ui_setsockopt - set various connection specific parameters.
1030  *      @sock: Socket to set options on.
1031  *      @level: Socket level user is requesting operations on.
1032  *      @optname: Operation name.
1033  *      @optval: User provided operation data.
1034  *      @optlen: Length of optval.
1035  *
1036  *      Set various connection specific parameters.
1037  */
1038 static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
1039                              char __user *optval, unsigned int optlen)
1040 {
1041         struct sock *sk = sock->sk;
1042         struct llc_sock *llc = llc_sk(sk);
1043         unsigned int opt;
1044         int rc = -EINVAL;
1045 
1046         lock_sock(sk);
1047         if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
1048                 goto out;
1049         rc = get_user(opt, (int __user *)optval);
1050         if (rc)
1051                 goto out;
1052         rc = -EINVAL;
1053         switch (optname) {
1054         case LLC_OPT_RETRY:
1055                 if (opt > LLC_OPT_MAX_RETRY)
1056                         goto out;
1057                 llc->n2 = opt;
1058                 break;
1059         case LLC_OPT_SIZE:
1060                 if (opt > LLC_OPT_MAX_SIZE)
1061                         goto out;
1062                 llc->n1 = opt;
1063                 break;
1064         case LLC_OPT_ACK_TMR_EXP:
1065                 if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
1066                         goto out;
1067                 llc->ack_timer.expire = opt * HZ;
1068                 break;
1069         case LLC_OPT_P_TMR_EXP:
1070                 if (opt > LLC_OPT_MAX_P_TMR_EXP)
1071                         goto out;
1072                 llc->pf_cycle_timer.expire = opt * HZ;
1073                 break;
1074         case LLC_OPT_REJ_TMR_EXP:
1075                 if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
1076                         goto out;
1077                 llc->rej_sent_timer.expire = opt * HZ;
1078                 break;
1079         case LLC_OPT_BUSY_TMR_EXP:
1080                 if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
1081                         goto out;
1082                 llc->busy_state_timer.expire = opt * HZ;
1083                 break;
1084         case LLC_OPT_TX_WIN:
1085                 if (opt > LLC_OPT_MAX_WIN)
1086                         goto out;
1087                 llc->k = opt;
1088                 break;
1089         case LLC_OPT_RX_WIN:
1090                 if (opt > LLC_OPT_MAX_WIN)
1091                         goto out;
1092                 llc->rw = opt;
1093                 break;
1094         case LLC_OPT_PKTINFO:
1095                 if (opt)
1096                         llc->cmsg_flags |= LLC_CMSG_PKTINFO;
1097                 else
1098                         llc->cmsg_flags &= ~LLC_CMSG_PKTINFO;
1099                 break;
1100         default:
1101                 rc = -ENOPROTOOPT;
1102                 goto out;
1103         }
1104         rc = 0;
1105 out:
1106         release_sock(sk);
1107         return rc;
1108 }
1109 
1110 /**
1111  *      llc_ui_getsockopt - get connection specific socket info
1112  *      @sock: Socket to get information from.
1113  *      @level: Socket level user is requesting operations on.
1114  *      @optname: Operation name.
1115  *      @optval: Variable to return operation data in.
1116  *      @optlen: Length of optval.
1117  *
1118  *      Get connection specific socket information.
1119  */
1120 static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
1121                              char __user *optval, int __user *optlen)
1122 {
1123         struct sock *sk = sock->sk;
1124         struct llc_sock *llc = llc_sk(sk);
1125         int val = 0, len = 0, rc = -EINVAL;
1126 
1127         lock_sock(sk);
1128         if (unlikely(level != SOL_LLC))
1129                 goto out;
1130         rc = get_user(len, optlen);
1131         if (rc)
1132                 goto out;
1133         rc = -EINVAL;
1134         if (len != sizeof(int))
1135                 goto out;
1136         switch (optname) {
1137         case LLC_OPT_RETRY:
1138                 val = llc->n2;                                  break;
1139         case LLC_OPT_SIZE:
1140                 val = llc->n1;                                  break;
1141         case LLC_OPT_ACK_TMR_EXP:
1142                 val = llc->ack_timer.expire / HZ;               break;
1143         case LLC_OPT_P_TMR_EXP:
1144                 val = llc->pf_cycle_timer.expire / HZ;          break;
1145         case LLC_OPT_REJ_TMR_EXP:
1146                 val = llc->rej_sent_timer.expire / HZ;          break;
1147         case LLC_OPT_BUSY_TMR_EXP:
1148                 val = llc->busy_state_timer.expire / HZ;        break;
1149         case LLC_OPT_TX_WIN:
1150                 val = llc->k;                           break;
1151         case LLC_OPT_RX_WIN:
1152                 val = llc->rw;                          break;
1153         case LLC_OPT_PKTINFO:
1154                 val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0;
1155                 break;
1156         default:
1157                 rc = -ENOPROTOOPT;
1158                 goto out;
1159         }
1160         rc = 0;
1161         if (put_user(len, optlen) || copy_to_user(optval, &val, len))
1162                 rc = -EFAULT;
1163 out:
1164         release_sock(sk);
1165         return rc;
1166 }
1167 
1168 static const struct net_proto_family llc_ui_family_ops = {
1169         .family = PF_LLC,
1170         .create = llc_ui_create,
1171         .owner  = THIS_MODULE,
1172 };
1173 
1174 static const struct proto_ops llc_ui_ops = {
1175         .family      = PF_LLC,
1176         .owner       = THIS_MODULE,
1177         .release     = llc_ui_release,
1178         .bind        = llc_ui_bind,
1179         .connect     = llc_ui_connect,
1180         .socketpair  = sock_no_socketpair,
1181         .accept      = llc_ui_accept,
1182         .getname     = llc_ui_getname,
1183         .poll        = datagram_poll,
1184         .ioctl       = llc_ui_ioctl,
1185         .listen      = llc_ui_listen,
1186         .shutdown    = llc_ui_shutdown,
1187         .setsockopt  = llc_ui_setsockopt,
1188         .getsockopt  = llc_ui_getsockopt,
1189         .sendmsg     = llc_ui_sendmsg,
1190         .recvmsg     = llc_ui_recvmsg,
1191         .mmap        = sock_no_mmap,
1192         .sendpage    = sock_no_sendpage,
1193 };
1194 
1195 static const char llc_proc_err_msg[] __initconst =
1196         KERN_CRIT "LLC: Unable to register the proc_fs entries\n";
1197 static const char llc_sysctl_err_msg[] __initconst =
1198         KERN_CRIT "LLC: Unable to register the sysctl entries\n";
1199 static const char llc_sock_err_msg[] __initconst =
1200         KERN_CRIT "LLC: Unable to register the network family\n";
1201 
1202 static int __init llc2_init(void)
1203 {
1204         int rc = proto_register(&llc_proto, 0);
1205 
1206         if (rc != 0)
1207                 goto out;
1208 
1209         llc_build_offset_table();
1210         llc_station_init();
1211         llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
1212         rc = llc_proc_init();
1213         if (rc != 0) {
1214                 printk(llc_proc_err_msg);
1215                 goto out_station;
1216         }
1217         rc = llc_sysctl_init();
1218         if (rc) {
1219                 printk(llc_sysctl_err_msg);
1220                 goto out_proc;
1221         }
1222         rc = sock_register(&llc_ui_family_ops);
1223         if (rc) {
1224                 printk(llc_sock_err_msg);
1225                 goto out_sysctl;
1226         }
1227         llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
1228         llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
1229 out:
1230         return rc;
1231 out_sysctl:
1232         llc_sysctl_exit();
1233 out_proc:
1234         llc_proc_exit();
1235 out_station:
1236         llc_station_exit();
1237         proto_unregister(&llc_proto);
1238         goto out;
1239 }
1240 
1241 static void __exit llc2_exit(void)
1242 {
1243         llc_station_exit();
1244         llc_remove_pack(LLC_DEST_SAP);
1245         llc_remove_pack(LLC_DEST_CONN);
1246         sock_unregister(PF_LLC);
1247         llc_proc_exit();
1248         llc_sysctl_exit();
1249         proto_unregister(&llc_proto);
1250 }
1251 
1252 module_init(llc2_init);
1253 module_exit(llc2_exit);
1254 
1255 MODULE_LICENSE("GPL");
1256 MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1257 MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1258 MODULE_ALIAS_NETPROTO(PF_LLC);
1259 

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