Commit | Line | Data |
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1da177e4 LT |
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/config.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/module.h> | |
1da177e4 LT |
26 | #include <linux/rtnetlink.h> |
27 | #include <linux/init.h> | |
28 | #include <net/llc.h> | |
29 | #include <net/llc_sap.h> | |
30 | #include <net/llc_pdu.h> | |
31 | #include <net/llc_conn.h> | |
c752f073 | 32 | #include <net/tcp_states.h> |
1da177e4 LT |
33 | |
34 | /* remember: uninitialized global data is zeroed because its in .bss */ | |
35 | static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START; | |
36 | static u16 llc_ui_sap_link_no_max[256]; | |
37 | static struct sockaddr_llc llc_ui_addrnull; | |
38 | static struct proto_ops llc_ui_ops; | |
39 | ||
54fb7f25 ACM |
40 | static int llc_ui_wait_for_conn(struct sock *sk, long timeout); |
41 | static int llc_ui_wait_for_disc(struct sock *sk, long timeout); | |
54fb7f25 | 42 | static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout); |
1da177e4 LT |
43 | |
44 | #if 0 | |
45 | #define dprintk(args...) printk(KERN_DEBUG args) | |
46 | #else | |
47 | #define dprintk(args...) | |
48 | #endif | |
49 | ||
50 | /** | |
51 | * llc_ui_next_link_no - return the next unused link number for a sap | |
52 | * @sap: Address of sap to get link number from. | |
53 | * | |
54 | * Return the next unused link number for a given sap. | |
55 | */ | |
56 | static __inline__ u16 llc_ui_next_link_no(int sap) | |
57 | { | |
58 | return llc_ui_sap_link_no_max[sap]++; | |
59 | } | |
60 | ||
61 | /** | |
62 | * llc_proto_type - return eth protocol for ARP header type | |
63 | * @arphrd: ARP header type. | |
64 | * | |
65 | * Given an ARP header type return the corresponding ethernet protocol. | |
66 | */ | |
67 | static __inline__ u16 llc_proto_type(u16 arphrd) | |
68 | { | |
69 | return arphrd == ARPHRD_IEEE802_TR ? | |
70 | htons(ETH_P_TR_802_2) : htons(ETH_P_802_2); | |
71 | } | |
72 | ||
73 | /** | |
74 | * llc_ui_addr_null - determines if a address structure is null | |
75 | * @addr: Address to test if null. | |
76 | */ | |
77 | static __inline__ u8 llc_ui_addr_null(struct sockaddr_llc *addr) | |
78 | { | |
79 | return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr)); | |
80 | } | |
81 | ||
82 | /** | |
83 | * llc_ui_header_len - return length of llc header based on operation | |
84 | * @sk: Socket which contains a valid llc socket type. | |
85 | * @addr: Complete sockaddr_llc structure received from the user. | |
86 | * | |
87 | * Provide the length of the llc header depending on what kind of | |
88 | * operation the user would like to perform and the type of socket. | |
89 | * Returns the correct llc header length. | |
90 | */ | |
91 | static __inline__ u8 llc_ui_header_len(struct sock *sk, | |
92 | struct sockaddr_llc *addr) | |
93 | { | |
94 | u8 rc = LLC_PDU_LEN_U; | |
95 | ||
96 | if (addr->sllc_test || addr->sllc_xid) | |
97 | rc = LLC_PDU_LEN_U; | |
98 | else if (sk->sk_type == SOCK_STREAM) | |
99 | rc = LLC_PDU_LEN_I; | |
100 | return rc; | |
101 | } | |
102 | ||
103 | /** | |
104 | * llc_ui_send_data - send data via reliable llc2 connection | |
105 | * @sk: Connection the socket is using. | |
106 | * @skb: Data the user wishes to send. | |
107 | * @addr: Source and destination fields provided by the user. | |
108 | * @noblock: can we block waiting for data? | |
109 | * | |
110 | * Send data via reliable llc2 connection. | |
111 | * Returns 0 upon success, non-zero if action did not succeed. | |
112 | */ | |
113 | static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock) | |
114 | { | |
115 | struct llc_sock* llc = llc_sk(sk); | |
116 | int rc = 0; | |
117 | ||
249ff1c6 | 118 | if (unlikely(llc_data_accept_state(llc->state) || llc->p_flag)) { |
54fb7f25 | 119 | long timeout = sock_sndtimeo(sk, noblock); |
1da177e4 LT |
120 | |
121 | rc = llc_ui_wait_for_busy_core(sk, timeout); | |
122 | } | |
249ff1c6 | 123 | if (unlikely(!rc)) |
1da177e4 LT |
124 | rc = llc_build_and_send_pkt(sk, skb); |
125 | return rc; | |
126 | } | |
127 | ||
128 | static void llc_ui_sk_init(struct socket *sock, struct sock *sk) | |
129 | { | |
130 | sk->sk_type = sock->type; | |
131 | sk->sk_sleep = &sock->wait; | |
132 | sk->sk_socket = sock; | |
133 | sock->sk = sk; | |
134 | sock->ops = &llc_ui_ops; | |
135 | } | |
136 | ||
137 | static struct proto llc_proto = { | |
138 | .name = "DDP", | |
139 | .owner = THIS_MODULE, | |
140 | .obj_size = sizeof(struct llc_sock), | |
141 | }; | |
142 | ||
143 | /** | |
144 | * llc_ui_create - alloc and init a new llc_ui socket | |
145 | * @sock: Socket to initialize and attach allocated sk to. | |
146 | * @protocol: Unused. | |
147 | * | |
148 | * Allocate and initialize a new llc_ui socket, validate the user wants a | |
149 | * socket type we have available. | |
150 | * Returns 0 upon success, negative upon failure. | |
151 | */ | |
152 | static int llc_ui_create(struct socket *sock, int protocol) | |
153 | { | |
154 | struct sock *sk; | |
155 | int rc = -ESOCKTNOSUPPORT; | |
156 | ||
af426d32 | 157 | if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) { |
1da177e4 LT |
158 | rc = -ENOMEM; |
159 | sk = llc_sk_alloc(PF_LLC, GFP_KERNEL, &llc_proto); | |
160 | if (sk) { | |
161 | rc = 0; | |
162 | llc_ui_sk_init(sock, sk); | |
163 | } | |
164 | } | |
165 | return rc; | |
166 | } | |
167 | ||
168 | /** | |
169 | * llc_ui_release - shutdown socket | |
170 | * @sock: Socket to release. | |
171 | * | |
172 | * Shutdown and deallocate an existing socket. | |
173 | */ | |
174 | static int llc_ui_release(struct socket *sock) | |
175 | { | |
176 | struct sock *sk = sock->sk; | |
177 | struct llc_sock *llc; | |
178 | ||
af426d32 | 179 | if (unlikely(sk == NULL)) |
1da177e4 LT |
180 | goto out; |
181 | sock_hold(sk); | |
182 | lock_sock(sk); | |
183 | llc = llc_sk(sk); | |
184 | dprintk("%s: closing local(%02X) remote(%02X)\n", __FUNCTION__, | |
185 | llc->laddr.lsap, llc->daddr.lsap); | |
186 | if (!llc_send_disc(sk)) | |
187 | llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); | |
188 | if (!sock_flag(sk, SOCK_ZAPPED)) | |
189 | llc_sap_remove_socket(llc->sap, sk); | |
190 | release_sock(sk); | |
191 | if (llc->sap && hlist_empty(&llc->sap->sk_list.list)) { | |
192 | llc_release_sockets(llc->sap); | |
193 | llc_sap_close(llc->sap); | |
194 | } | |
195 | if (llc->dev) | |
196 | dev_put(llc->dev); | |
197 | sock_put(sk); | |
198 | llc_sk_free(sk); | |
199 | out: | |
200 | return 0; | |
201 | } | |
202 | ||
203 | /** | |
204 | * llc_ui_autoport - provide dynamically allocate SAP number | |
205 | * | |
206 | * Provide the caller with a dynamically allocated SAP number according | |
207 | * to the rules that are set in this function. Returns: 0, upon failure, | |
208 | * SAP number otherwise. | |
209 | */ | |
210 | static int llc_ui_autoport(void) | |
211 | { | |
212 | struct llc_sap *sap; | |
213 | int i, tries = 0; | |
214 | ||
215 | while (tries < LLC_SAP_DYN_TRIES) { | |
216 | for (i = llc_ui_sap_last_autoport; | |
217 | i < LLC_SAP_DYN_STOP; i += 2) { | |
218 | sap = llc_sap_find(i); | |
219 | if (!sap) { | |
220 | llc_ui_sap_last_autoport = i + 2; | |
221 | goto out; | |
222 | } | |
223 | } | |
224 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; | |
225 | tries++; | |
226 | } | |
227 | i = 0; | |
228 | out: | |
229 | return i; | |
230 | } | |
231 | ||
232 | /** | |
5a770c02 ACM |
233 | * llc_ui_autobind - automatically bind a socket to a sap |
234 | * @sock: socket to bind | |
235 | * @addr: address to connect to | |
236 | * | |
237 | * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't | |
238 | * specifically used llc_ui_bind to bind to an specific address/sap | |
1da177e4 | 239 | * |
1da177e4 LT |
240 | * Returns: 0 upon success, negative otherwise. |
241 | */ | |
242 | static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr) | |
243 | { | |
244 | struct sock *sk = sock->sk; | |
245 | struct llc_sock *llc = llc_sk(sk); | |
246 | struct llc_sap *sap; | |
247 | int rc = -EINVAL; | |
248 | ||
249 | if (!sock_flag(sk, SOCK_ZAPPED)) | |
250 | goto out; | |
251 | rc = -ENODEV; | |
252 | llc->dev = dev_getfirstbyhwtype(addr->sllc_arphrd); | |
253 | if (!llc->dev) | |
254 | goto out; | |
255 | rc = -EUSERS; | |
256 | llc->laddr.lsap = llc_ui_autoport(); | |
257 | if (!llc->laddr.lsap) | |
258 | goto out; | |
259 | rc = -EBUSY; /* some other network layer is using the sap */ | |
260 | sap = llc_sap_open(llc->laddr.lsap, NULL); | |
261 | if (!sap) | |
262 | goto out; | |
263 | memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN); | |
264 | memcpy(&llc->addr, addr, sizeof(llc->addr)); | |
265 | /* assign new connection to its SAP */ | |
266 | llc_sap_add_socket(sap, sk); | |
267 | sock_reset_flag(sk, SOCK_ZAPPED); | |
268 | rc = 0; | |
269 | out: | |
270 | return rc; | |
271 | } | |
272 | ||
273 | /** | |
274 | * llc_ui_bind - bind a socket to a specific address. | |
275 | * @sock: Socket to bind an address to. | |
276 | * @uaddr: Address the user wants the socket bound to. | |
277 | * @addrlen: Length of the uaddr structure. | |
278 | * | |
279 | * Bind a socket to a specific address. For llc a user is able to bind to | |
5a770c02 | 280 | * a specific sap only or mac + sap. |
1da177e4 LT |
281 | * If the user desires to bind to a specific mac + sap, it is possible to |
282 | * have multiple sap connections via multiple macs. | |
283 | * Bind and autobind for that matter must enforce the correct sap usage | |
284 | * otherwise all hell will break loose. | |
285 | * Returns: 0 upon success, negative otherwise. | |
286 | */ | |
287 | static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen) | |
288 | { | |
289 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; | |
290 | struct sock *sk = sock->sk; | |
291 | struct llc_sock *llc = llc_sk(sk); | |
292 | struct llc_sap *sap; | |
293 | int rc = -EINVAL; | |
294 | ||
295 | dprintk("%s: binding %02X\n", __FUNCTION__, addr->sllc_sap); | |
af426d32 | 296 | if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr))) |
1da177e4 LT |
297 | goto out; |
298 | rc = -EAFNOSUPPORT; | |
af426d32 | 299 | if (unlikely(addr->sllc_family != AF_LLC)) |
1da177e4 LT |
300 | goto out; |
301 | if (!addr->sllc_sap) { | |
302 | rc = -EUSERS; | |
303 | addr->sllc_sap = llc_ui_autoport(); | |
304 | if (!addr->sllc_sap) | |
305 | goto out; | |
306 | } | |
307 | sap = llc_sap_find(addr->sllc_sap); | |
308 | if (!sap) { | |
309 | sap = llc_sap_open(addr->sllc_sap, NULL); | |
310 | rc = -EBUSY; /* some other network layer is using the sap */ | |
311 | if (!sap) | |
312 | goto out; | |
313 | } else { | |
314 | struct llc_addr laddr, daddr; | |
315 | struct sock *ask; | |
316 | ||
317 | memset(&laddr, 0, sizeof(laddr)); | |
318 | memset(&daddr, 0, sizeof(daddr)); | |
319 | /* | |
320 | * FIXME: check if the the address is multicast, | |
321 | * only SOCK_DGRAM can do this. | |
322 | */ | |
323 | memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
324 | laddr.lsap = addr->sllc_sap; | |
325 | rc = -EADDRINUSE; /* mac + sap clash. */ | |
326 | ask = llc_lookup_established(sap, &daddr, &laddr); | |
327 | if (ask) { | |
328 | sock_put(ask); | |
329 | goto out; | |
330 | } | |
331 | } | |
332 | llc->laddr.lsap = addr->sllc_sap; | |
333 | memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
334 | memcpy(&llc->addr, addr, sizeof(llc->addr)); | |
335 | /* assign new connection to its SAP */ | |
336 | llc_sap_add_socket(sap, sk); | |
337 | sock_reset_flag(sk, SOCK_ZAPPED); | |
338 | rc = 0; | |
339 | out: | |
340 | return rc; | |
341 | } | |
342 | ||
343 | /** | |
344 | * llc_ui_shutdown - shutdown a connect llc2 socket. | |
345 | * @sock: Socket to shutdown. | |
346 | * @how: What part of the socket to shutdown. | |
347 | * | |
348 | * Shutdown a connected llc2 socket. Currently this function only supports | |
349 | * shutting down both sends and receives (2), we could probably make this | |
350 | * function such that a user can shutdown only half the connection but not | |
351 | * right now. | |
352 | * Returns: 0 upon success, negative otherwise. | |
353 | */ | |
354 | static int llc_ui_shutdown(struct socket *sock, int how) | |
355 | { | |
356 | struct sock *sk = sock->sk; | |
357 | int rc = -ENOTCONN; | |
358 | ||
359 | lock_sock(sk); | |
af426d32 | 360 | if (unlikely(sk->sk_state != TCP_ESTABLISHED)) |
1da177e4 LT |
361 | goto out; |
362 | rc = -EINVAL; | |
363 | if (how != 2) | |
364 | goto out; | |
365 | rc = llc_send_disc(sk); | |
366 | if (!rc) | |
367 | rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); | |
368 | /* Wake up anyone sleeping in poll */ | |
369 | sk->sk_state_change(sk); | |
370 | out: | |
371 | release_sock(sk); | |
372 | return rc; | |
373 | } | |
374 | ||
375 | /** | |
376 | * llc_ui_connect - Connect to a remote llc2 mac + sap. | |
377 | * @sock: Socket which will be connected to the remote destination. | |
378 | * @uaddr: Remote and possibly the local address of the new connection. | |
379 | * @addrlen: Size of uaddr structure. | |
380 | * @flags: Operational flags specified by the user. | |
381 | * | |
382 | * Connect to a remote llc2 mac + sap. The caller must specify the | |
383 | * destination mac and address to connect to. If the user hasn't previously | |
384 | * called bind(2) with a smac the address of the first interface of the | |
385 | * specified arp type will be used. | |
386 | * This function will autobind if user did not previously call bind. | |
387 | * Returns: 0 upon success, negative otherwise. | |
388 | */ | |
389 | static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr, | |
390 | int addrlen, int flags) | |
391 | { | |
392 | struct sock *sk = sock->sk; | |
393 | struct llc_sock *llc = llc_sk(sk); | |
394 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; | |
1da177e4 LT |
395 | int rc = -EINVAL; |
396 | ||
397 | lock_sock(sk); | |
af426d32 | 398 | if (unlikely(addrlen != sizeof(*addr))) |
1da177e4 LT |
399 | goto out; |
400 | rc = -EAFNOSUPPORT; | |
af426d32 ACM |
401 | if (unlikely(addr->sllc_family != AF_LLC)) |
402 | goto out; | |
403 | if (unlikely(sk->sk_type != SOCK_STREAM)) | |
404 | goto out; | |
405 | rc = -EALREADY; | |
406 | if (unlikely(sock->state == SS_CONNECTING)) | |
1da177e4 LT |
407 | goto out; |
408 | /* bind connection to sap if user hasn't done it. */ | |
409 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
410 | /* bind to sap with null dev, exclusive */ | |
411 | rc = llc_ui_autobind(sock, addr); | |
412 | if (rc) | |
413 | goto out; | |
414 | llc->daddr.lsap = addr->sllc_sap; | |
415 | memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
416 | } | |
1da177e4 LT |
417 | sock->state = SS_CONNECTING; |
418 | sk->sk_state = TCP_SYN_SENT; | |
419 | llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap); | |
774ccb4f | 420 | rc = llc_establish_connection(sk, llc->dev->dev_addr, |
1da177e4 LT |
421 | addr->sllc_mac, addr->sllc_sap); |
422 | if (rc) { | |
423 | dprintk("%s: llc_ui_send_conn failed :-(\n", __FUNCTION__); | |
424 | sock->state = SS_UNCONNECTED; | |
425 | sk->sk_state = TCP_CLOSE; | |
426 | goto out; | |
427 | } | |
b35bd110 ACM |
428 | |
429 | if (sk->sk_state == TCP_SYN_SENT) { | |
54fb7f25 | 430 | const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
b35bd110 ACM |
431 | |
432 | if (!timeo || !llc_ui_wait_for_conn(sk, timeo)) | |
433 | goto out; | |
434 | ||
435 | rc = sock_intr_errno(timeo); | |
436 | if (signal_pending(current)) | |
437 | goto out; | |
438 | } | |
439 | ||
440 | if (sk->sk_state == TCP_CLOSE) | |
441 | goto sock_error; | |
442 | ||
443 | sock->state = SS_CONNECTED; | |
444 | rc = 0; | |
1da177e4 LT |
445 | out: |
446 | release_sock(sk); | |
447 | return rc; | |
b35bd110 ACM |
448 | sock_error: |
449 | rc = sock_error(sk) ? : -ECONNABORTED; | |
450 | sock->state = SS_UNCONNECTED; | |
451 | goto out; | |
1da177e4 LT |
452 | } |
453 | ||
454 | /** | |
455 | * llc_ui_listen - allow a normal socket to accept incoming connections | |
456 | * @sock: Socket to allow incoming connections on. | |
457 | * @backlog: Number of connections to queue. | |
458 | * | |
459 | * Allow a normal socket to accept incoming connections. | |
460 | * Returns 0 upon success, negative otherwise. | |
461 | */ | |
462 | static int llc_ui_listen(struct socket *sock, int backlog) | |
463 | { | |
464 | struct sock *sk = sock->sk; | |
465 | int rc = -EINVAL; | |
466 | ||
467 | lock_sock(sk); | |
af426d32 | 468 | if (unlikely(sock->state != SS_UNCONNECTED)) |
1da177e4 LT |
469 | goto out; |
470 | rc = -EOPNOTSUPP; | |
af426d32 | 471 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
1da177e4 LT |
472 | goto out; |
473 | rc = -EAGAIN; | |
474 | if (sock_flag(sk, SOCK_ZAPPED)) | |
475 | goto out; | |
476 | rc = 0; | |
477 | if (!(unsigned)backlog) /* BSDism */ | |
478 | backlog = 1; | |
479 | sk->sk_max_ack_backlog = backlog; | |
480 | if (sk->sk_state != TCP_LISTEN) { | |
481 | sk->sk_ack_backlog = 0; | |
482 | sk->sk_state = TCP_LISTEN; | |
483 | } | |
484 | sk->sk_socket->flags |= __SO_ACCEPTCON; | |
485 | out: | |
486 | release_sock(sk); | |
487 | return rc; | |
488 | } | |
489 | ||
54fb7f25 | 490 | static int llc_ui_wait_for_disc(struct sock *sk, long timeout) |
1da177e4 | 491 | { |
b35bd110 ACM |
492 | DEFINE_WAIT(wait); |
493 | int rc = 0; | |
1da177e4 | 494 | |
54fb7f25 ACM |
495 | while (1) { |
496 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
497 | if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE)) | |
498 | break; | |
1da177e4 LT |
499 | rc = -ERESTARTSYS; |
500 | if (signal_pending(current)) | |
501 | break; | |
502 | rc = -EAGAIN; | |
503 | if (!timeout) | |
504 | break; | |
b35bd110 | 505 | rc = 0; |
1da177e4 | 506 | } |
b35bd110 | 507 | finish_wait(sk->sk_sleep, &wait); |
1da177e4 LT |
508 | return rc; |
509 | } | |
510 | ||
54fb7f25 | 511 | static int llc_ui_wait_for_conn(struct sock *sk, long timeout) |
1da177e4 | 512 | { |
b35bd110 | 513 | DEFINE_WAIT(wait); |
1da177e4 | 514 | |
54fb7f25 ACM |
515 | while (1) { |
516 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
517 | if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT)) | |
518 | break; | |
b35bd110 | 519 | if (signal_pending(current) || !timeout) |
1da177e4 LT |
520 | break; |
521 | } | |
b35bd110 ACM |
522 | finish_wait(sk->sk_sleep, &wait); |
523 | return timeout; | |
1da177e4 LT |
524 | } |
525 | ||
afdbe357 | 526 | static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout) |
1da177e4 | 527 | { |
b35bd110 | 528 | DEFINE_WAIT(wait); |
afdbe357 ACM |
529 | struct llc_sock *llc = llc_sk(sk); |
530 | int rc; | |
1da177e4 | 531 | |
54fb7f25 | 532 | while (1) { |
b35bd110 | 533 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
afdbe357 | 534 | rc = 0; |
54fb7f25 ACM |
535 | if (sk_wait_event(sk, &timeout, |
536 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
afdbe357 ACM |
537 | (!llc_data_accept_state(llc->state) && |
538 | !llc->p_flag))) | |
1da177e4 | 539 | break; |
1da177e4 LT |
540 | rc = -ERESTARTSYS; |
541 | if (signal_pending(current)) | |
542 | break; | |
543 | rc = -EAGAIN; | |
544 | if (!timeout) | |
545 | break; | |
546 | } | |
b35bd110 | 547 | finish_wait(sk->sk_sleep, &wait); |
1da177e4 LT |
548 | return rc; |
549 | } | |
550 | ||
afdbe357 | 551 | int llc_wait_data(struct sock *sk, long timeo) |
1da177e4 | 552 | { |
1da177e4 LT |
553 | int rc; |
554 | ||
54fb7f25 | 555 | while (1) { |
afdbe357 ACM |
556 | /* |
557 | * POSIX 1003.1g mandates this order. | |
558 | */ | |
559 | if (sk->sk_err) { | |
560 | rc = sock_error(sk); | |
561 | break; | |
562 | } | |
1da177e4 | 563 | rc = 0; |
afdbe357 | 564 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
1da177e4 | 565 | break; |
afdbe357 ACM |
566 | rc = -EAGAIN; |
567 | if (!timeo) | |
568 | break; | |
569 | rc = sock_intr_errno(timeo); | |
1da177e4 LT |
570 | if (signal_pending(current)) |
571 | break; | |
afdbe357 ACM |
572 | rc = 0; |
573 | if (sk_wait_data(sk, &timeo)) | |
1da177e4 LT |
574 | break; |
575 | } | |
1da177e4 LT |
576 | return rc; |
577 | } | |
578 | ||
579 | /** | |
580 | * llc_ui_accept - accept a new incoming connection. | |
581 | * @sock: Socket which connections arrive on. | |
582 | * @newsock: Socket to move incoming connection to. | |
583 | * @flags: User specified operational flags. | |
584 | * | |
585 | * Accept a new incoming connection. | |
586 | * Returns 0 upon success, negative otherwise. | |
587 | */ | |
588 | static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags) | |
589 | { | |
590 | struct sock *sk = sock->sk, *newsk; | |
591 | struct llc_sock *llc, *newllc; | |
592 | struct sk_buff *skb; | |
593 | int rc = -EOPNOTSUPP; | |
594 | ||
595 | dprintk("%s: accepting on %02X\n", __FUNCTION__, | |
596 | llc_sk(sk)->laddr.lsap); | |
597 | lock_sock(sk); | |
af426d32 | 598 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
1da177e4 LT |
599 | goto out; |
600 | rc = -EINVAL; | |
af426d32 ACM |
601 | if (unlikely(sock->state != SS_UNCONNECTED || |
602 | sk->sk_state != TCP_LISTEN)) | |
1da177e4 LT |
603 | goto out; |
604 | /* wait for a connection to arrive. */ | |
b35bd110 | 605 | if (skb_queue_empty(&sk->sk_receive_queue)) { |
afdbe357 | 606 | rc = llc_wait_data(sk, sk->sk_rcvtimeo); |
b35bd110 ACM |
607 | if (rc) |
608 | goto out; | |
609 | } | |
1da177e4 LT |
610 | dprintk("%s: got a new connection on %02X\n", __FUNCTION__, |
611 | llc_sk(sk)->laddr.lsap); | |
612 | skb = skb_dequeue(&sk->sk_receive_queue); | |
613 | rc = -EINVAL; | |
614 | if (!skb->sk) | |
615 | goto frees; | |
616 | rc = 0; | |
617 | newsk = skb->sk; | |
618 | /* attach connection to a new socket. */ | |
619 | llc_ui_sk_init(newsock, newsk); | |
620 | sock_reset_flag(newsk, SOCK_ZAPPED); | |
621 | newsk->sk_state = TCP_ESTABLISHED; | |
622 | newsock->state = SS_CONNECTED; | |
623 | llc = llc_sk(sk); | |
624 | newllc = llc_sk(newsk); | |
625 | memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr)); | |
626 | newllc->link = llc_ui_next_link_no(newllc->laddr.lsap); | |
627 | ||
628 | /* put original socket back into a clean listen state. */ | |
629 | sk->sk_state = TCP_LISTEN; | |
630 | sk->sk_ack_backlog--; | |
1da177e4 LT |
631 | dprintk("%s: ok success on %02X, client on %02X\n", __FUNCTION__, |
632 | llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap); | |
633 | frees: | |
634 | kfree_skb(skb); | |
635 | out: | |
636 | release_sock(sk); | |
637 | return rc; | |
638 | } | |
639 | ||
640 | /** | |
641 | * llc_ui_recvmsg - copy received data to the socket user. | |
642 | * @sock: Socket to copy data from. | |
643 | * @msg: Various user space related information. | |
644 | * @size: Size of user buffer. | |
645 | * @flags: User specified flags. | |
646 | * | |
647 | * Copy received data to the socket user. | |
648 | * Returns non-negative upon success, negative otherwise. | |
649 | */ | |
650 | static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock, | |
651 | struct msghdr *msg, size_t size, int flags) | |
652 | { | |
653 | struct sock *sk = sock->sk; | |
654 | struct sockaddr_llc *uaddr = (struct sockaddr_llc *)msg->msg_name; | |
655 | struct sk_buff *skb; | |
656 | size_t copied = 0; | |
b35bd110 | 657 | int rc = -ENOMEM; |
1da177e4 LT |
658 | int noblock = flags & MSG_DONTWAIT; |
659 | ||
660 | dprintk("%s: receiving in %02X from %02X\n", __FUNCTION__, | |
661 | llc_sk(sk)->laddr.lsap, llc_sk(sk)->daddr.lsap); | |
662 | lock_sock(sk); | |
b35bd110 | 663 | if (skb_queue_empty(&sk->sk_receive_queue)) { |
afdbe357 | 664 | rc = llc_wait_data(sk, sock_rcvtimeo(sk, noblock)); |
b35bd110 ACM |
665 | if (rc) |
666 | goto out; | |
1da177e4 LT |
667 | } |
668 | skb = skb_dequeue(&sk->sk_receive_queue); | |
669 | if (!skb) /* shutdown */ | |
670 | goto out; | |
671 | copied = skb->len; | |
672 | if (copied > size) | |
673 | copied = size; | |
674 | rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
675 | if (rc) | |
676 | goto dgram_free; | |
677 | if (skb->len > copied) { | |
678 | skb_pull(skb, copied); | |
679 | skb_queue_head(&sk->sk_receive_queue, skb); | |
680 | } | |
681 | if (uaddr) | |
682 | memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr)); | |
683 | msg->msg_namelen = sizeof(*uaddr); | |
8728b834 | 684 | if (!skb->next) { |
1da177e4 LT |
685 | dgram_free: |
686 | kfree_skb(skb); | |
687 | } | |
688 | out: | |
689 | release_sock(sk); | |
690 | return rc ? : copied; | |
691 | } | |
692 | ||
693 | /** | |
694 | * llc_ui_sendmsg - Transmit data provided by the socket user. | |
695 | * @sock: Socket to transmit data from. | |
696 | * @msg: Various user related information. | |
697 | * @len: Length of data to transmit. | |
698 | * | |
699 | * Transmit data provided by the socket user. | |
700 | * Returns non-negative upon success, negative otherwise. | |
701 | */ | |
702 | static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock, | |
703 | struct msghdr *msg, size_t len) | |
704 | { | |
705 | struct sock *sk = sock->sk; | |
706 | struct llc_sock *llc = llc_sk(sk); | |
707 | struct sockaddr_llc *addr = (struct sockaddr_llc *)msg->msg_name; | |
708 | int flags = msg->msg_flags; | |
709 | int noblock = flags & MSG_DONTWAIT; | |
1da177e4 LT |
710 | struct sk_buff *skb; |
711 | size_t size = 0; | |
712 | int rc = -EINVAL, copied = 0, hdrlen; | |
713 | ||
714 | dprintk("%s: sending from %02X to %02X\n", __FUNCTION__, | |
715 | llc->laddr.lsap, llc->daddr.lsap); | |
716 | lock_sock(sk); | |
717 | if (addr) { | |
718 | if (msg->msg_namelen < sizeof(*addr)) | |
719 | goto release; | |
720 | } else { | |
721 | if (llc_ui_addr_null(&llc->addr)) | |
722 | goto release; | |
723 | addr = &llc->addr; | |
724 | } | |
725 | /* must bind connection to sap if user hasn't done it. */ | |
726 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
727 | /* bind to sap with null dev, exclusive. */ | |
728 | rc = llc_ui_autobind(sock, addr); | |
729 | if (rc) | |
730 | goto release; | |
731 | } | |
774ccb4f | 732 | hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr); |
1da177e4 | 733 | size = hdrlen + len; |
774ccb4f ACM |
734 | if (size > llc->dev->mtu) |
735 | size = llc->dev->mtu; | |
1da177e4 LT |
736 | copied = size - hdrlen; |
737 | release_sock(sk); | |
738 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
739 | lock_sock(sk); | |
740 | if (!skb) | |
741 | goto release; | |
774ccb4f | 742 | skb->dev = llc->dev; |
1da177e4 LT |
743 | skb->protocol = llc_proto_type(addr->sllc_arphrd); |
744 | skb_reserve(skb, hdrlen); | |
745 | rc = memcpy_fromiovec(skb_put(skb, copied), msg->msg_iov, copied); | |
746 | if (rc) | |
747 | goto out; | |
748 | if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) { | |
749 | llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac, | |
750 | addr->sllc_sap); | |
751 | goto out; | |
752 | } | |
753 | if (addr->sllc_test) { | |
754 | llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac, | |
755 | addr->sllc_sap); | |
756 | goto out; | |
757 | } | |
758 | if (addr->sllc_xid) { | |
759 | llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac, | |
760 | addr->sllc_sap); | |
761 | goto out; | |
762 | } | |
763 | rc = -ENOPROTOOPT; | |
764 | if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua)) | |
765 | goto out; | |
766 | rc = llc_ui_send_data(sk, skb, noblock); | |
1da177e4 | 767 | out: |
249ff1c6 | 768 | if (rc) { |
1da177e4 LT |
769 | kfree_skb(skb); |
770 | release: | |
1da177e4 LT |
771 | dprintk("%s: failed sending from %02X to %02X: %d\n", |
772 | __FUNCTION__, llc->laddr.lsap, llc->daddr.lsap, rc); | |
249ff1c6 | 773 | } |
1da177e4 LT |
774 | release_sock(sk); |
775 | return rc ? : copied; | |
776 | } | |
777 | ||
778 | /** | |
779 | * llc_ui_getname - return the address info of a socket | |
780 | * @sock: Socket to get address of. | |
781 | * @uaddr: Address structure to return information. | |
782 | * @uaddrlen: Length of address structure. | |
783 | * @peer: Does user want local or remote address information. | |
784 | * | |
785 | * Return the address information of a socket. | |
786 | */ | |
787 | static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr, | |
788 | int *uaddrlen, int peer) | |
789 | { | |
790 | struct sockaddr_llc sllc; | |
791 | struct sock *sk = sock->sk; | |
792 | struct llc_sock *llc = llc_sk(sk); | |
793 | int rc = 0; | |
794 | ||
795 | lock_sock(sk); | |
796 | if (sock_flag(sk, SOCK_ZAPPED)) | |
797 | goto out; | |
798 | *uaddrlen = sizeof(sllc); | |
799 | memset(uaddr, 0, *uaddrlen); | |
800 | if (peer) { | |
801 | rc = -ENOTCONN; | |
802 | if (sk->sk_state != TCP_ESTABLISHED) | |
803 | goto out; | |
804 | if(llc->dev) | |
805 | sllc.sllc_arphrd = llc->dev->type; | |
806 | sllc.sllc_sap = llc->daddr.lsap; | |
807 | memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN); | |
808 | } else { | |
809 | rc = -EINVAL; | |
810 | if (!llc->sap) | |
811 | goto out; | |
812 | sllc.sllc_sap = llc->sap->laddr.lsap; | |
813 | ||
814 | if (llc->dev) { | |
815 | sllc.sllc_arphrd = llc->dev->type; | |
816 | memcpy(&sllc.sllc_mac, &llc->dev->dev_addr, | |
817 | IFHWADDRLEN); | |
818 | } | |
819 | } | |
820 | rc = 0; | |
821 | sllc.sllc_family = AF_LLC; | |
822 | memcpy(uaddr, &sllc, sizeof(sllc)); | |
823 | out: | |
824 | release_sock(sk); | |
825 | return rc; | |
826 | } | |
827 | ||
828 | /** | |
829 | * llc_ui_ioctl - io controls for PF_LLC | |
830 | * @sock: Socket to get/set info | |
831 | * @cmd: command | |
832 | * @arg: optional argument for cmd | |
833 | * | |
834 | * get/set info on llc sockets | |
835 | */ | |
836 | static int llc_ui_ioctl(struct socket *sock, unsigned int cmd, | |
837 | unsigned long arg) | |
838 | { | |
839 | return dev_ioctl(cmd, (void __user *)arg); | |
840 | } | |
841 | ||
842 | /** | |
843 | * llc_ui_setsockopt - set various connection specific parameters. | |
844 | * @sock: Socket to set options on. | |
845 | * @level: Socket level user is requesting operations on. | |
846 | * @optname: Operation name. | |
847 | * @optval User provided operation data. | |
848 | * @optlen: Length of optval. | |
849 | * | |
850 | * Set various connection specific parameters. | |
851 | */ | |
852 | static int llc_ui_setsockopt(struct socket *sock, int level, int optname, | |
853 | char __user *optval, int optlen) | |
854 | { | |
855 | struct sock *sk = sock->sk; | |
856 | struct llc_sock *llc = llc_sk(sk); | |
857 | int rc = -EINVAL, opt; | |
858 | ||
859 | lock_sock(sk); | |
af426d32 | 860 | if (unlikely(level != SOL_LLC || optlen != sizeof(int))) |
1da177e4 LT |
861 | goto out; |
862 | rc = get_user(opt, (int __user *)optval); | |
863 | if (rc) | |
864 | goto out; | |
865 | rc = -EINVAL; | |
866 | switch (optname) { | |
867 | case LLC_OPT_RETRY: | |
868 | if (opt > LLC_OPT_MAX_RETRY) | |
869 | goto out; | |
870 | llc->n2 = opt; | |
871 | break; | |
872 | case LLC_OPT_SIZE: | |
873 | if (opt > LLC_OPT_MAX_SIZE) | |
874 | goto out; | |
875 | llc->n1 = opt; | |
876 | break; | |
877 | case LLC_OPT_ACK_TMR_EXP: | |
878 | if (opt > LLC_OPT_MAX_ACK_TMR_EXP) | |
879 | goto out; | |
590232a7 | 880 | llc->ack_timer.expire = opt * HZ; |
1da177e4 LT |
881 | break; |
882 | case LLC_OPT_P_TMR_EXP: | |
883 | if (opt > LLC_OPT_MAX_P_TMR_EXP) | |
884 | goto out; | |
590232a7 | 885 | llc->pf_cycle_timer.expire = opt * HZ; |
1da177e4 LT |
886 | break; |
887 | case LLC_OPT_REJ_TMR_EXP: | |
888 | if (opt > LLC_OPT_MAX_REJ_TMR_EXP) | |
889 | goto out; | |
590232a7 | 890 | llc->rej_sent_timer.expire = opt * HZ; |
1da177e4 LT |
891 | break; |
892 | case LLC_OPT_BUSY_TMR_EXP: | |
893 | if (opt > LLC_OPT_MAX_BUSY_TMR_EXP) | |
894 | goto out; | |
590232a7 | 895 | llc->busy_state_timer.expire = opt * HZ; |
1da177e4 LT |
896 | break; |
897 | case LLC_OPT_TX_WIN: | |
898 | if (opt > LLC_OPT_MAX_WIN) | |
899 | goto out; | |
900 | llc->k = opt; | |
901 | break; | |
902 | case LLC_OPT_RX_WIN: | |
903 | if (opt > LLC_OPT_MAX_WIN) | |
904 | goto out; | |
905 | llc->rw = opt; | |
906 | break; | |
907 | default: | |
908 | rc = -ENOPROTOOPT; | |
909 | goto out; | |
910 | } | |
911 | rc = 0; | |
912 | out: | |
913 | release_sock(sk); | |
914 | return rc; | |
915 | } | |
916 | ||
917 | /** | |
918 | * llc_ui_getsockopt - get connection specific socket info | |
919 | * @sock: Socket to get information from. | |
920 | * @level: Socket level user is requesting operations on. | |
921 | * @optname: Operation name. | |
922 | * @optval: Variable to return operation data in. | |
923 | * @optlen: Length of optval. | |
924 | * | |
925 | * Get connection specific socket information. | |
926 | */ | |
927 | static int llc_ui_getsockopt(struct socket *sock, int level, int optname, | |
928 | char __user *optval, int __user *optlen) | |
929 | { | |
930 | struct sock *sk = sock->sk; | |
931 | struct llc_sock *llc = llc_sk(sk); | |
932 | int val = 0, len = 0, rc = -EINVAL; | |
933 | ||
934 | lock_sock(sk); | |
af426d32 | 935 | if (unlikely(level != SOL_LLC)) |
1da177e4 LT |
936 | goto out; |
937 | rc = get_user(len, optlen); | |
938 | if (rc) | |
939 | goto out; | |
940 | rc = -EINVAL; | |
941 | if (len != sizeof(int)) | |
942 | goto out; | |
943 | switch (optname) { | |
944 | case LLC_OPT_RETRY: | |
590232a7 | 945 | val = llc->n2; break; |
1da177e4 | 946 | case LLC_OPT_SIZE: |
590232a7 | 947 | val = llc->n1; break; |
1da177e4 | 948 | case LLC_OPT_ACK_TMR_EXP: |
590232a7 | 949 | val = llc->ack_timer.expire / HZ; break; |
1da177e4 | 950 | case LLC_OPT_P_TMR_EXP: |
590232a7 | 951 | val = llc->pf_cycle_timer.expire / HZ; break; |
1da177e4 | 952 | case LLC_OPT_REJ_TMR_EXP: |
590232a7 | 953 | val = llc->rej_sent_timer.expire / HZ; break; |
1da177e4 | 954 | case LLC_OPT_BUSY_TMR_EXP: |
590232a7 | 955 | val = llc->busy_state_timer.expire / HZ; break; |
1da177e4 LT |
956 | case LLC_OPT_TX_WIN: |
957 | val = llc->k; break; | |
958 | case LLC_OPT_RX_WIN: | |
959 | val = llc->rw; break; | |
960 | default: | |
961 | rc = -ENOPROTOOPT; | |
962 | goto out; | |
963 | } | |
964 | rc = 0; | |
965 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) | |
966 | rc = -EFAULT; | |
967 | out: | |
968 | release_sock(sk); | |
969 | return rc; | |
970 | } | |
971 | ||
972 | static struct net_proto_family llc_ui_family_ops = { | |
973 | .family = PF_LLC, | |
974 | .create = llc_ui_create, | |
975 | .owner = THIS_MODULE, | |
976 | }; | |
977 | ||
978 | static struct proto_ops llc_ui_ops = { | |
979 | .family = PF_LLC, | |
980 | .owner = THIS_MODULE, | |
981 | .release = llc_ui_release, | |
982 | .bind = llc_ui_bind, | |
983 | .connect = llc_ui_connect, | |
984 | .socketpair = sock_no_socketpair, | |
985 | .accept = llc_ui_accept, | |
986 | .getname = llc_ui_getname, | |
987 | .poll = datagram_poll, | |
988 | .ioctl = llc_ui_ioctl, | |
989 | .listen = llc_ui_listen, | |
990 | .shutdown = llc_ui_shutdown, | |
991 | .setsockopt = llc_ui_setsockopt, | |
992 | .getsockopt = llc_ui_getsockopt, | |
993 | .sendmsg = llc_ui_sendmsg, | |
994 | .recvmsg = llc_ui_recvmsg, | |
995 | .mmap = sock_no_mmap, | |
996 | .sendpage = sock_no_sendpage, | |
997 | }; | |
998 | ||
999 | extern void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb); | |
1000 | extern void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb); | |
1001 | ||
590232a7 ACM |
1002 | static char llc_proc_err_msg[] __initdata = |
1003 | KERN_CRIT "LLC: Unable to register the proc_fs entries\n"; | |
1004 | static char llc_sysctl_err_msg[] __initdata = | |
1005 | KERN_CRIT "LLC: Unable to register the sysctl entries\n"; | |
1006 | static char llc_sock_err_msg[] __initdata = | |
1007 | KERN_CRIT "LLC: Unable to register the network family\n"; | |
1008 | ||
1da177e4 LT |
1009 | static int __init llc2_init(void) |
1010 | { | |
1011 | int rc = proto_register(&llc_proto, 0); | |
1012 | ||
1013 | if (rc != 0) | |
1014 | goto out; | |
1015 | ||
1016 | llc_build_offset_table(); | |
1017 | llc_station_init(); | |
1018 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; | |
1019 | rc = llc_proc_init(); | |
590232a7 ACM |
1020 | if (rc != 0) { |
1021 | printk(llc_proc_err_msg); | |
1da177e4 | 1022 | goto out_unregister_llc_proto; |
590232a7 ACM |
1023 | } |
1024 | rc = llc_sysctl_init(); | |
1025 | if (rc) { | |
1026 | printk(llc_sysctl_err_msg); | |
1027 | goto out_proc; | |
1028 | } | |
1029 | rc = sock_register(&llc_ui_family_ops); | |
1030 | if (rc) { | |
1031 | printk(llc_sock_err_msg); | |
1032 | goto out_sysctl; | |
1033 | } | |
1da177e4 LT |
1034 | llc_add_pack(LLC_DEST_SAP, llc_sap_handler); |
1035 | llc_add_pack(LLC_DEST_CONN, llc_conn_handler); | |
1036 | out: | |
1037 | return rc; | |
590232a7 ACM |
1038 | out_sysctl: |
1039 | llc_sysctl_exit(); | |
1040 | out_proc: | |
1041 | llc_proc_exit(); | |
1da177e4 LT |
1042 | out_unregister_llc_proto: |
1043 | proto_unregister(&llc_proto); | |
1044 | goto out; | |
1045 | } | |
1046 | ||
1047 | static void __exit llc2_exit(void) | |
1048 | { | |
1049 | llc_station_exit(); | |
1050 | llc_remove_pack(LLC_DEST_SAP); | |
1051 | llc_remove_pack(LLC_DEST_CONN); | |
1052 | sock_unregister(PF_LLC); | |
1053 | llc_proc_exit(); | |
590232a7 | 1054 | llc_sysctl_exit(); |
1da177e4 LT |
1055 | proto_unregister(&llc_proto); |
1056 | } | |
1057 | ||
1058 | module_init(llc2_init); | |
1059 | module_exit(llc2_exit); | |
1060 | ||
1061 | MODULE_LICENSE("GPL"); | |
1062 | MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003"); | |
1063 | MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support"); | |
1064 | MODULE_ALIAS_NETPROTO(PF_LLC); |