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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 int 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 arphrd == ARPHRD_IEEE802_TR ? |
75 | htons(ETH_P_TR_802_2) : htons(ETH_P_802_2); |
76 | } |
77 | |
78 | /** |
79 | * llc_ui_addr_null - determines if a address structure is null |
80 | * @addr: Address to test if null. |
81 | */ |
82 | static inline u8 llc_ui_addr_null(struct sockaddr_llc *addr) |
83 | { |
84 | return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr)); |
85 | } |
86 | |
87 | /** |
88 | * llc_ui_header_len - return length of llc header based on operation |
89 | * @sk: Socket which contains a valid llc socket type. |
90 | * @addr: Complete sockaddr_llc structure received from the user. |
91 | * |
92 | * Provide the length of the llc header depending on what kind of |
93 | * operation the user would like to perform and the type of socket. |
94 | * Returns the correct llc header length. |
95 | */ |
96 | static inline u8 llc_ui_header_len(struct sock *sk, struct sockaddr_llc *addr) |
97 | { |
98 | u8 rc = LLC_PDU_LEN_U; |
99 | |
100 | if (addr->sllc_test || addr->sllc_xid) |
101 | rc = LLC_PDU_LEN_U; |
102 | else if (sk->sk_type == SOCK_STREAM) |
103 | rc = LLC_PDU_LEN_I; |
104 | return rc; |
105 | } |
106 | |
107 | /** |
108 | * llc_ui_send_data - send data via reliable llc2 connection |
109 | * @sk: Connection the socket is using. |
110 | * @skb: Data the user wishes to send. |
111 | * @noblock: can we block waiting for data? |
112 | * |
113 | * Send data via reliable llc2 connection. |
114 | * Returns 0 upon success, non-zero if action did not succeed. |
115 | */ |
116 | static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock) |
117 | { |
118 | struct llc_sock* llc = llc_sk(sk); |
119 | int rc = 0; |
120 | |
121 | if (unlikely(llc_data_accept_state(llc->state) || |
122 | llc->remote_busy_flag || |
123 | llc->p_flag)) { |
124 | long timeout = sock_sndtimeo(sk, noblock); |
125 | |
126 | rc = llc_ui_wait_for_busy_core(sk, timeout); |
127 | } |
128 | if (unlikely(!rc)) |
129 | rc = llc_build_and_send_pkt(sk, skb); |
130 | return rc; |
131 | } |
132 | |
133 | static void llc_ui_sk_init(struct socket *sock, struct sock *sk) |
134 | { |
135 | sock_graft(sk, sock); |
136 | sk->sk_type = sock->type; |
137 | sock->ops = &llc_ui_ops; |
138 | } |
139 | |
140 | static struct proto llc_proto = { |
141 | .name = "LLC", |
142 | .owner = THIS_MODULE, |
143 | .obj_size = sizeof(struct llc_sock), |
144 | .slab_flags = SLAB_DESTROY_BY_RCU, |
145 | }; |
146 | |
147 | /** |
148 | * llc_ui_create - alloc and init a new llc_ui socket |
149 | * @net: network namespace (must be default network) |
150 | * @sock: Socket to initialize and attach allocated sk to. |
151 | * @protocol: Unused. |
152 | * @kern: on behalf of kernel or userspace |
153 | * |
154 | * Allocate and initialize a new llc_ui socket, validate the user wants a |
155 | * socket type we have available. |
156 | * Returns 0 upon success, negative upon failure. |
157 | */ |
158 | static int llc_ui_create(struct net *net, struct socket *sock, int protocol, |
159 | int kern) |
160 | { |
161 | struct sock *sk; |
162 | int rc = -ESOCKTNOSUPPORT; |
163 | |
164 | if (!capable(CAP_NET_RAW)) |
165 | return -EPERM; |
166 | |
167 | if (!net_eq(net, &init_net)) |
168 | return -EAFNOSUPPORT; |
169 | |
170 | if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) { |
171 | rc = -ENOMEM; |
172 | sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto); |
173 | if (sk) { |
174 | rc = 0; |
175 | llc_ui_sk_init(sock, sk); |
176 | } |
177 | } |
178 | return rc; |
179 | } |
180 | |
181 | /** |
182 | * llc_ui_release - shutdown socket |
183 | * @sock: Socket to release. |
184 | * |
185 | * Shutdown and deallocate an existing socket. |
186 | */ |
187 | static int llc_ui_release(struct socket *sock) |
188 | { |
189 | struct sock *sk = sock->sk; |
190 | struct llc_sock *llc; |
191 | |
192 | if (unlikely(sk == NULL)) |
193 | goto out; |
194 | sock_hold(sk); |
195 | lock_sock(sk); |
196 | llc = llc_sk(sk); |
197 | dprintk("%s: closing local(%02X) remote(%02X)\n", __func__, |
198 | llc->laddr.lsap, llc->daddr.lsap); |
199 | if (!llc_send_disc(sk)) |
200 | llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); |
201 | if (!sock_flag(sk, SOCK_ZAPPED)) |
202 | llc_sap_remove_socket(llc->sap, sk); |
203 | release_sock(sk); |
204 | if (llc->dev) |
205 | dev_put(llc->dev); |
206 | sock_put(sk); |
207 | llc_sk_free(sk); |
208 | out: |
209 | return 0; |
210 | } |
211 | |
212 | /** |
213 | * llc_ui_autoport - provide dynamically allocate SAP number |
214 | * |
215 | * Provide the caller with a dynamically allocated SAP number according |
216 | * to the rules that are set in this function. Returns: 0, upon failure, |
217 | * SAP number otherwise. |
218 | */ |
219 | static int llc_ui_autoport(void) |
220 | { |
221 | struct llc_sap *sap; |
222 | int i, tries = 0; |
223 | |
224 | while (tries < LLC_SAP_DYN_TRIES) { |
225 | for (i = llc_ui_sap_last_autoport; |
226 | i < LLC_SAP_DYN_STOP; i += 2) { |
227 | sap = llc_sap_find(i); |
228 | if (!sap) { |
229 | llc_ui_sap_last_autoport = i + 2; |
230 | goto out; |
231 | } |
232 | llc_sap_put(sap); |
233 | } |
234 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; |
235 | tries++; |
236 | } |
237 | i = 0; |
238 | out: |
239 | return i; |
240 | } |
241 | |
242 | /** |
243 | * llc_ui_autobind - automatically bind a socket to a sap |
244 | * @sock: socket to bind |
245 | * @addr: address to connect to |
246 | * |
247 | * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't |
248 | * specifically used llc_ui_bind to bind to an specific address/sap |
249 | * |
250 | * Returns: 0 upon success, negative otherwise. |
251 | */ |
252 | static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr) |
253 | { |
254 | struct sock *sk = sock->sk; |
255 | struct llc_sock *llc = llc_sk(sk); |
256 | struct llc_sap *sap; |
257 | int rc = -EINVAL; |
258 | |
259 | if (!sock_flag(sk, SOCK_ZAPPED)) |
260 | goto out; |
261 | rc = -ENODEV; |
262 | if (sk->sk_bound_dev_if) { |
263 | llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if); |
264 | if (llc->dev && addr->sllc_arphrd != llc->dev->type) { |
265 | dev_put(llc->dev); |
266 | llc->dev = NULL; |
267 | } |
268 | } else |
269 | llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd); |
270 | if (!llc->dev) |
271 | goto out; |
272 | rc = -EUSERS; |
273 | llc->laddr.lsap = llc_ui_autoport(); |
274 | if (!llc->laddr.lsap) |
275 | goto out; |
276 | rc = -EBUSY; /* some other network layer is using the sap */ |
277 | sap = llc_sap_open(llc->laddr.lsap, NULL); |
278 | if (!sap) |
279 | goto out; |
280 | memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN); |
281 | memcpy(&llc->addr, addr, sizeof(llc->addr)); |
282 | /* assign new connection to its SAP */ |
283 | llc_sap_add_socket(sap, sk); |
284 | sock_reset_flag(sk, SOCK_ZAPPED); |
285 | rc = 0; |
286 | out: |
287 | return rc; |
288 | } |
289 | |
290 | /** |
291 | * llc_ui_bind - bind a socket to a specific address. |
292 | * @sock: Socket to bind an address to. |
293 | * @uaddr: Address the user wants the socket bound to. |
294 | * @addrlen: Length of the uaddr structure. |
295 | * |
296 | * Bind a socket to a specific address. For llc a user is able to bind to |
297 | * a specific sap only or mac + sap. |
298 | * If the user desires to bind to a specific mac + sap, it is possible to |
299 | * have multiple sap connections via multiple macs. |
300 | * Bind and autobind for that matter must enforce the correct sap usage |
301 | * otherwise all hell will break loose. |
302 | * Returns: 0 upon success, negative otherwise. |
303 | */ |
304 | static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen) |
305 | { |
306 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; |
307 | struct sock *sk = sock->sk; |
308 | struct llc_sock *llc = llc_sk(sk); |
309 | struct llc_sap *sap; |
310 | int rc = -EINVAL; |
311 | |
312 | dprintk("%s: binding %02X\n", __func__, addr->sllc_sap); |
313 | if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr))) |
314 | goto out; |
315 | rc = -EAFNOSUPPORT; |
316 | if (unlikely(addr->sllc_family != AF_LLC)) |
317 | goto out; |
318 | rc = -ENODEV; |
319 | rtnl_lock(); |
320 | if (sk->sk_bound_dev_if) { |
321 | llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if); |
322 | if (llc->dev) { |
323 | if (!addr->sllc_arphrd) |
324 | addr->sllc_arphrd = llc->dev->type; |
325 | if (llc_mac_null(addr->sllc_mac)) |
326 | memcpy(addr->sllc_mac, llc->dev->dev_addr, |
327 | IFHWADDRLEN); |
328 | if (addr->sllc_arphrd != llc->dev->type || |
329 | !llc_mac_match(addr->sllc_mac, |
330 | llc->dev->dev_addr)) { |
331 | rc = -EINVAL; |
332 | dev_put(llc->dev); |
333 | llc->dev = NULL; |
334 | } |
335 | } |
336 | } else |
337 | llc->dev = dev_getbyhwaddr(&init_net, addr->sllc_arphrd, |
338 | addr->sllc_mac); |
339 | rtnl_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)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->sk_sleep, &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->sk_sleep, &wait); |
551 | return rc; |
552 | } |
553 | |
554 | static int llc_ui_wait_for_conn(struct sock *sk, long timeout) |
555 | { |
556 | DEFINE_WAIT(wait); |
557 | |
558 | while (1) { |
559 | prepare_to_wait(sk->sk_sleep, &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->sk_sleep, &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->sk_sleep, &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->sk_sleep, &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)) |
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 | info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex; |
630 | llc_pdu_decode_dsap(skb, &info.lpi_sap); |
631 | llc_pdu_decode_da(skb, info.lpi_mac); |
632 | put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info); |
633 | } |
634 | } |
635 | |
636 | /** |
637 | * llc_ui_accept - accept a new incoming connection. |
638 | * @sock: Socket which connections arrive on. |
639 | * @newsock: Socket to move incoming connection to. |
640 | * @flags: User specified operational flags. |
641 | * |
642 | * Accept a new incoming connection. |
643 | * Returns 0 upon success, negative otherwise. |
644 | */ |
645 | static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags) |
646 | { |
647 | struct sock *sk = sock->sk, *newsk; |
648 | struct llc_sock *llc, *newllc; |
649 | struct sk_buff *skb; |
650 | int rc = -EOPNOTSUPP; |
651 | |
652 | dprintk("%s: accepting on %02X\n", __func__, |
653 | llc_sk(sk)->laddr.lsap); |
654 | lock_sock(sk); |
655 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
656 | goto out; |
657 | rc = -EINVAL; |
658 | if (unlikely(sock->state != SS_UNCONNECTED || |
659 | sk->sk_state != TCP_LISTEN)) |
660 | goto out; |
661 | /* wait for a connection to arrive. */ |
662 | if (skb_queue_empty(&sk->sk_receive_queue)) { |
663 | rc = llc_wait_data(sk, sk->sk_rcvtimeo); |
664 | if (rc) |
665 | goto out; |
666 | } |
667 | dprintk("%s: got a new connection on %02X\n", __func__, |
668 | llc_sk(sk)->laddr.lsap); |
669 | skb = skb_dequeue(&sk->sk_receive_queue); |
670 | rc = -EINVAL; |
671 | if (!skb->sk) |
672 | goto frees; |
673 | rc = 0; |
674 | newsk = skb->sk; |
675 | /* attach connection to a new socket. */ |
676 | llc_ui_sk_init(newsock, newsk); |
677 | sock_reset_flag(newsk, SOCK_ZAPPED); |
678 | newsk->sk_state = TCP_ESTABLISHED; |
679 | newsock->state = SS_CONNECTED; |
680 | llc = llc_sk(sk); |
681 | newllc = llc_sk(newsk); |
682 | memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr)); |
683 | newllc->link = llc_ui_next_link_no(newllc->laddr.lsap); |
684 | |
685 | /* put original socket back into a clean listen state. */ |
686 | sk->sk_state = TCP_LISTEN; |
687 | sk->sk_ack_backlog--; |
688 | dprintk("%s: ok success on %02X, client on %02X\n", __func__, |
689 | llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap); |
690 | frees: |
691 | kfree_skb(skb); |
692 | out: |
693 | release_sock(sk); |
694 | return rc; |
695 | } |
696 | |
697 | /** |
698 | * llc_ui_recvmsg - copy received data to the socket user. |
699 | * @sock: Socket to copy data from. |
700 | * @msg: Various user space related information. |
701 | * @len: Size of user buffer. |
702 | * @flags: User specified flags. |
703 | * |
704 | * Copy received data to the socket user. |
705 | * Returns non-negative upon success, negative otherwise. |
706 | */ |
707 | static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock, |
708 | struct msghdr *msg, size_t len, int flags) |
709 | { |
710 | struct sockaddr_llc *uaddr = (struct sockaddr_llc *)msg->msg_name; |
711 | const int nonblock = flags & MSG_DONTWAIT; |
712 | struct sk_buff *skb = NULL; |
713 | struct sock *sk = sock->sk; |
714 | struct llc_sock *llc = llc_sk(sk); |
715 | size_t copied = 0; |
716 | u32 peek_seq = 0; |
717 | u32 *seq; |
718 | unsigned long used; |
719 | int target; /* Read at least this many bytes */ |
720 | long timeo; |
721 | |
722 | lock_sock(sk); |
723 | copied = -ENOTCONN; |
724 | if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN)) |
725 | goto out; |
726 | |
727 | timeo = sock_rcvtimeo(sk, nonblock); |
728 | |
729 | seq = &llc->copied_seq; |
730 | if (flags & MSG_PEEK) { |
731 | peek_seq = llc->copied_seq; |
732 | seq = &peek_seq; |
733 | } |
734 | |
735 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); |
736 | copied = 0; |
737 | |
738 | do { |
739 | u32 offset; |
740 | |
741 | /* |
742 | * We need to check signals first, to get correct SIGURG |
743 | * handling. FIXME: Need to check this doesn't impact 1003.1g |
744 | * and move it down to the bottom of the loop |
745 | */ |
746 | if (signal_pending(current)) { |
747 | if (copied) |
748 | break; |
749 | copied = timeo ? sock_intr_errno(timeo) : -EAGAIN; |
750 | break; |
751 | } |
752 | |
753 | /* Next get a buffer. */ |
754 | |
755 | skb = skb_peek(&sk->sk_receive_queue); |
756 | if (skb) { |
757 | offset = *seq; |
758 | goto found_ok_skb; |
759 | } |
760 | /* Well, if we have backlog, try to process it now yet. */ |
761 | |
762 | if (copied >= target && !sk->sk_backlog.tail) |
763 | break; |
764 | |
765 | if (copied) { |
766 | if (sk->sk_err || |
767 | sk->sk_state == TCP_CLOSE || |
768 | (sk->sk_shutdown & RCV_SHUTDOWN) || |
769 | !timeo || |
770 | (flags & MSG_PEEK)) |
771 | break; |
772 | } else { |
773 | if (sock_flag(sk, SOCK_DONE)) |
774 | break; |
775 | |
776 | if (sk->sk_err) { |
777 | copied = sock_error(sk); |
778 | break; |
779 | } |
780 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
781 | break; |
782 | |
783 | if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) { |
784 | if (!sock_flag(sk, SOCK_DONE)) { |
785 | /* |
786 | * This occurs when user tries to read |
787 | * from never connected socket. |
788 | */ |
789 | copied = -ENOTCONN; |
790 | break; |
791 | } |
792 | break; |
793 | } |
794 | if (!timeo) { |
795 | copied = -EAGAIN; |
796 | break; |
797 | } |
798 | } |
799 | |
800 | if (copied >= target) { /* Do not sleep, just process backlog. */ |
801 | release_sock(sk); |
802 | lock_sock(sk); |
803 | } else |
804 | sk_wait_data(sk, &timeo); |
805 | |
806 | if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) { |
807 | if (net_ratelimit()) |
808 | printk(KERN_DEBUG "LLC(%s:%d): Application " |
809 | "bug, race in MSG_PEEK.\n", |
810 | current->comm, task_pid_nr(current)); |
811 | peek_seq = llc->copied_seq; |
812 | } |
813 | continue; |
814 | found_ok_skb: |
815 | /* Ok so how much can we use? */ |
816 | used = skb->len - offset; |
817 | if (len < used) |
818 | used = len; |
819 | |
820 | if (!(flags & MSG_TRUNC)) { |
821 | int rc = skb_copy_datagram_iovec(skb, offset, |
822 | msg->msg_iov, used); |
823 | if (rc) { |
824 | /* Exception. Bailout! */ |
825 | if (!copied) |
826 | copied = -EFAULT; |
827 | break; |
828 | } |
829 | } |
830 | |
831 | *seq += used; |
832 | copied += used; |
833 | len -= used; |
834 | |
835 | if (!(flags & MSG_PEEK)) { |
836 | sk_eat_skb(sk, skb, 0); |
837 | *seq = 0; |
838 | } |
839 | |
840 | /* For non stream protcols we get one packet per recvmsg call */ |
841 | if (sk->sk_type != SOCK_STREAM) |
842 | goto copy_uaddr; |
843 | |
844 | /* Partial read */ |
845 | if (used + offset < skb->len) |
846 | continue; |
847 | } while (len > 0); |
848 | |
849 | out: |
850 | release_sock(sk); |
851 | return copied; |
852 | copy_uaddr: |
853 | if (uaddr != NULL && skb != NULL) { |
854 | memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr)); |
855 | msg->msg_namelen = sizeof(*uaddr); |
856 | } |
857 | if (llc_sk(sk)->cmsg_flags) |
858 | llc_cmsg_rcv(msg, skb); |
859 | goto out; |
860 | } |
861 | |
862 | /** |
863 | * llc_ui_sendmsg - Transmit data provided by the socket user. |
864 | * @sock: Socket to transmit data from. |
865 | * @msg: Various user related information. |
866 | * @len: Length of data to transmit. |
867 | * |
868 | * Transmit data provided by the socket user. |
869 | * Returns non-negative upon success, negative otherwise. |
870 | */ |
871 | static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock, |
872 | struct msghdr *msg, size_t len) |
873 | { |
874 | struct sock *sk = sock->sk; |
875 | struct llc_sock *llc = llc_sk(sk); |
876 | struct sockaddr_llc *addr = (struct sockaddr_llc *)msg->msg_name; |
877 | int flags = msg->msg_flags; |
878 | int noblock = flags & MSG_DONTWAIT; |
879 | struct sk_buff *skb; |
880 | size_t size = 0; |
881 | int rc = -EINVAL, copied = 0, hdrlen; |
882 | |
883 | dprintk("%s: sending from %02X to %02X\n", __func__, |
884 | llc->laddr.lsap, llc->daddr.lsap); |
885 | lock_sock(sk); |
886 | if (addr) { |
887 | if (msg->msg_namelen < sizeof(*addr)) |
888 | goto release; |
889 | } else { |
890 | if (llc_ui_addr_null(&llc->addr)) |
891 | goto release; |
892 | addr = &llc->addr; |
893 | } |
894 | /* must bind connection to sap if user hasn't done it. */ |
895 | if (sock_flag(sk, SOCK_ZAPPED)) { |
896 | /* bind to sap with null dev, exclusive. */ |
897 | rc = llc_ui_autobind(sock, addr); |
898 | if (rc) |
899 | goto release; |
900 | } |
901 | hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr); |
902 | size = hdrlen + len; |
903 | if (size > llc->dev->mtu) |
904 | size = llc->dev->mtu; |
905 | copied = size - hdrlen; |
906 | release_sock(sk); |
907 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); |
908 | lock_sock(sk); |
909 | if (!skb) |
910 | goto release; |
911 | skb->dev = llc->dev; |
912 | skb->protocol = llc_proto_type(addr->sllc_arphrd); |
913 | skb_reserve(skb, hdrlen); |
914 | rc = memcpy_fromiovec(skb_put(skb, copied), msg->msg_iov, copied); |
915 | if (rc) |
916 | goto out; |
917 | if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) { |
918 | llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac, |
919 | addr->sllc_sap); |
920 | goto out; |
921 | } |
922 | if (addr->sllc_test) { |
923 | llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac, |
924 | addr->sllc_sap); |
925 | goto out; |
926 | } |
927 | if (addr->sllc_xid) { |
928 | llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac, |
929 | addr->sllc_sap); |
930 | goto out; |
931 | } |
932 | rc = -ENOPROTOOPT; |
933 | if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua)) |
934 | goto out; |
935 | rc = llc_ui_send_data(sk, skb, noblock); |
936 | out: |
937 | if (rc) { |
938 | kfree_skb(skb); |
939 | release: |
940 | dprintk("%s: failed sending from %02X to %02X: %d\n", |
941 | __func__, llc->laddr.lsap, llc->daddr.lsap, rc); |
942 | } |
943 | release_sock(sk); |
944 | return rc ? : copied; |
945 | } |
946 | |
947 | /** |
948 | * llc_ui_getname - return the address info of a socket |
949 | * @sock: Socket to get address of. |
950 | * @uaddr: Address structure to return information. |
951 | * @uaddrlen: Length of address structure. |
952 | * @peer: Does user want local or remote address information. |
953 | * |
954 | * Return the address information of a socket. |
955 | */ |
956 | static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr, |
957 | int *uaddrlen, int peer) |
958 | { |
959 | struct sockaddr_llc sllc; |
960 | struct sock *sk = sock->sk; |
961 | struct llc_sock *llc = llc_sk(sk); |
962 | int rc = 0; |
963 | |
964 | memset(&sllc, 0, sizeof(sllc)); |
965 | lock_sock(sk); |
966 | if (sock_flag(sk, SOCK_ZAPPED)) |
967 | goto out; |
968 | *uaddrlen = sizeof(sllc); |
969 | memset(uaddr, 0, *uaddrlen); |
970 | if (peer) { |
971 | rc = -ENOTCONN; |
972 | if (sk->sk_state != TCP_ESTABLISHED) |
973 | goto out; |
974 | if(llc->dev) |
975 | sllc.sllc_arphrd = llc->dev->type; |
976 | sllc.sllc_sap = llc->daddr.lsap; |
977 | memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN); |
978 | } else { |
979 | rc = -EINVAL; |
980 | if (!llc->sap) |
981 | goto out; |
982 | sllc.sllc_sap = llc->sap->laddr.lsap; |
983 | |
984 | if (llc->dev) { |
985 | sllc.sllc_arphrd = llc->dev->type; |
986 | memcpy(&sllc.sllc_mac, llc->dev->dev_addr, |
987 | IFHWADDRLEN); |
988 | } |
989 | } |
990 | rc = 0; |
991 | sllc.sllc_family = AF_LLC; |
992 | memcpy(uaddr, &sllc, sizeof(sllc)); |
993 | out: |
994 | release_sock(sk); |
995 | return rc; |
996 | } |
997 | |
998 | /** |
999 | * llc_ui_ioctl - io controls for PF_LLC |
1000 | * @sock: Socket to get/set info |
1001 | * @cmd: command |
1002 | * @arg: optional argument for cmd |
1003 | * |
1004 | * get/set info on llc sockets |
1005 | */ |
1006 | static int llc_ui_ioctl(struct socket *sock, unsigned int cmd, |
1007 | unsigned long arg) |
1008 | { |
1009 | return -ENOIOCTLCMD; |
1010 | } |
1011 | |
1012 | /** |
1013 | * llc_ui_setsockopt - set various connection specific parameters. |
1014 | * @sock: Socket to set options on. |
1015 | * @level: Socket level user is requesting operations on. |
1016 | * @optname: Operation name. |
1017 | * @optval User provided operation data. |
1018 | * @optlen: Length of optval. |
1019 | * |
1020 | * Set various connection specific parameters. |
1021 | */ |
1022 | static int llc_ui_setsockopt(struct socket *sock, int level, int optname, |
1023 | char __user *optval, unsigned int optlen) |
1024 | { |
1025 | struct sock *sk = sock->sk; |
1026 | struct llc_sock *llc = llc_sk(sk); |
1027 | int rc = -EINVAL, opt; |
1028 | |
1029 | lock_sock(sk); |
1030 | if (unlikely(level != SOL_LLC || optlen != sizeof(int))) |
1031 | goto out; |
1032 | rc = get_user(opt, (int __user *)optval); |
1033 | if (rc) |
1034 | goto out; |
1035 | rc = -EINVAL; |
1036 | switch (optname) { |
1037 | case LLC_OPT_RETRY: |
1038 | if (opt > LLC_OPT_MAX_RETRY) |
1039 | goto out; |
1040 | llc->n2 = opt; |
1041 | break; |
1042 | case LLC_OPT_SIZE: |
1043 | if (opt > LLC_OPT_MAX_SIZE) |
1044 | goto out; |
1045 | llc->n1 = opt; |
1046 | break; |
1047 | case LLC_OPT_ACK_TMR_EXP: |
1048 | if (opt > LLC_OPT_MAX_ACK_TMR_EXP) |
1049 | goto out; |
1050 | llc->ack_timer.expire = opt * HZ; |
1051 | break; |
1052 | case LLC_OPT_P_TMR_EXP: |
1053 | if (opt > LLC_OPT_MAX_P_TMR_EXP) |
1054 | goto out; |
1055 | llc->pf_cycle_timer.expire = opt * HZ; |
1056 | break; |
1057 | case LLC_OPT_REJ_TMR_EXP: |
1058 | if (opt > LLC_OPT_MAX_REJ_TMR_EXP) |
1059 | goto out; |
1060 | llc->rej_sent_timer.expire = opt * HZ; |
1061 | break; |
1062 | case LLC_OPT_BUSY_TMR_EXP: |
1063 | if (opt > LLC_OPT_MAX_BUSY_TMR_EXP) |
1064 | goto out; |
1065 | llc->busy_state_timer.expire = opt * HZ; |
1066 | break; |
1067 | case LLC_OPT_TX_WIN: |
1068 | if (opt > LLC_OPT_MAX_WIN) |
1069 | goto out; |
1070 | llc->k = opt; |
1071 | break; |
1072 | case LLC_OPT_RX_WIN: |
1073 | if (opt > LLC_OPT_MAX_WIN) |
1074 | goto out; |
1075 | llc->rw = opt; |
1076 | break; |
1077 | case LLC_OPT_PKTINFO: |
1078 | if (opt) |
1079 | llc->cmsg_flags |= LLC_CMSG_PKTINFO; |
1080 | else |
1081 | llc->cmsg_flags &= ~LLC_CMSG_PKTINFO; |
1082 | break; |
1083 | default: |
1084 | rc = -ENOPROTOOPT; |
1085 | goto out; |
1086 | } |
1087 | rc = 0; |
1088 | out: |
1089 | release_sock(sk); |
1090 | return rc; |
1091 | } |
1092 | |
1093 | /** |
1094 | * llc_ui_getsockopt - get connection specific socket info |
1095 | * @sock: Socket to get information from. |
1096 | * @level: Socket level user is requesting operations on. |
1097 | * @optname: Operation name. |
1098 | * @optval: Variable to return operation data in. |
1099 | * @optlen: Length of optval. |
1100 | * |
1101 | * Get connection specific socket information. |
1102 | */ |
1103 | static int llc_ui_getsockopt(struct socket *sock, int level, int optname, |
1104 | char __user *optval, int __user *optlen) |
1105 | { |
1106 | struct sock *sk = sock->sk; |
1107 | struct llc_sock *llc = llc_sk(sk); |
1108 | int val = 0, len = 0, rc = -EINVAL; |
1109 | |
1110 | lock_sock(sk); |
1111 | if (unlikely(level != SOL_LLC)) |
1112 | goto out; |
1113 | rc = get_user(len, optlen); |
1114 | if (rc) |
1115 | goto out; |
1116 | rc = -EINVAL; |
1117 | if (len != sizeof(int)) |
1118 | goto out; |
1119 | switch (optname) { |
1120 | case LLC_OPT_RETRY: |
1121 | val = llc->n2; break; |
1122 | case LLC_OPT_SIZE: |
1123 | val = llc->n1; break; |
1124 | case LLC_OPT_ACK_TMR_EXP: |
1125 | val = llc->ack_timer.expire / HZ; break; |
1126 | case LLC_OPT_P_TMR_EXP: |
1127 | val = llc->pf_cycle_timer.expire / HZ; break; |
1128 | case LLC_OPT_REJ_TMR_EXP: |
1129 | val = llc->rej_sent_timer.expire / HZ; break; |
1130 | case LLC_OPT_BUSY_TMR_EXP: |
1131 | val = llc->busy_state_timer.expire / HZ; break; |
1132 | case LLC_OPT_TX_WIN: |
1133 | val = llc->k; break; |
1134 | case LLC_OPT_RX_WIN: |
1135 | val = llc->rw; break; |
1136 | case LLC_OPT_PKTINFO: |
1137 | val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0; |
1138 | break; |
1139 | default: |
1140 | rc = -ENOPROTOOPT; |
1141 | goto out; |
1142 | } |
1143 | rc = 0; |
1144 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) |
1145 | rc = -EFAULT; |
1146 | out: |
1147 | release_sock(sk); |
1148 | return rc; |
1149 | } |
1150 | |
1151 | static const struct net_proto_family llc_ui_family_ops = { |
1152 | .family = PF_LLC, |
1153 | .create = llc_ui_create, |
1154 | .owner = THIS_MODULE, |
1155 | }; |
1156 | |
1157 | static const struct proto_ops llc_ui_ops = { |
1158 | .family = PF_LLC, |
1159 | .owner = THIS_MODULE, |
1160 | .release = llc_ui_release, |
1161 | .bind = llc_ui_bind, |
1162 | .connect = llc_ui_connect, |
1163 | .socketpair = sock_no_socketpair, |
1164 | .accept = llc_ui_accept, |
1165 | .getname = llc_ui_getname, |
1166 | .poll = datagram_poll, |
1167 | .ioctl = llc_ui_ioctl, |
1168 | .listen = llc_ui_listen, |
1169 | .shutdown = llc_ui_shutdown, |
1170 | .setsockopt = llc_ui_setsockopt, |
1171 | .getsockopt = llc_ui_getsockopt, |
1172 | .sendmsg = llc_ui_sendmsg, |
1173 | .recvmsg = llc_ui_recvmsg, |
1174 | .mmap = sock_no_mmap, |
1175 | .sendpage = sock_no_sendpage, |
1176 | }; |
1177 | |
1178 | static const char llc_proc_err_msg[] __initconst = |
1179 | KERN_CRIT "LLC: Unable to register the proc_fs entries\n"; |
1180 | static const char llc_sysctl_err_msg[] __initconst = |
1181 | KERN_CRIT "LLC: Unable to register the sysctl entries\n"; |
1182 | static const char llc_sock_err_msg[] __initconst = |
1183 | KERN_CRIT "LLC: Unable to register the network family\n"; |
1184 | |
1185 | static int __init llc2_init(void) |
1186 | { |
1187 | int rc = proto_register(&llc_proto, 0); |
1188 | |
1189 | if (rc != 0) |
1190 | goto out; |
1191 | |
1192 | llc_build_offset_table(); |
1193 | llc_station_init(); |
1194 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; |
1195 | rc = llc_proc_init(); |
1196 | if (rc != 0) { |
1197 | printk(llc_proc_err_msg); |
1198 | goto out_unregister_llc_proto; |
1199 | } |
1200 | rc = llc_sysctl_init(); |
1201 | if (rc) { |
1202 | printk(llc_sysctl_err_msg); |
1203 | goto out_proc; |
1204 | } |
1205 | rc = sock_register(&llc_ui_family_ops); |
1206 | if (rc) { |
1207 | printk(llc_sock_err_msg); |
1208 | goto out_sysctl; |
1209 | } |
1210 | llc_add_pack(LLC_DEST_SAP, llc_sap_handler); |
1211 | llc_add_pack(LLC_DEST_CONN, llc_conn_handler); |
1212 | out: |
1213 | return rc; |
1214 | out_sysctl: |
1215 | llc_sysctl_exit(); |
1216 | out_proc: |
1217 | llc_proc_exit(); |
1218 | out_unregister_llc_proto: |
1219 | proto_unregister(&llc_proto); |
1220 | goto out; |
1221 | } |
1222 | |
1223 | static void __exit llc2_exit(void) |
1224 | { |
1225 | llc_station_exit(); |
1226 | llc_remove_pack(LLC_DEST_SAP); |
1227 | llc_remove_pack(LLC_DEST_CONN); |
1228 | sock_unregister(PF_LLC); |
1229 | llc_proc_exit(); |
1230 | llc_sysctl_exit(); |
1231 | proto_unregister(&llc_proto); |
1232 | } |
1233 | |
1234 | module_init(llc2_init); |
1235 | module_exit(llc2_exit); |
1236 | |
1237 | MODULE_LICENSE("GPL"); |
1238 | MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003"); |
1239 | MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support"); |
1240 | MODULE_ALIAS_NETPROTO(PF_LLC); |
1241 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9