Commit | Line | Data |
---|---|---|
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 | */ | |
6e2144b7 | 23 | #include <linux/compiler.h> |
1da177e4 LT |
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; | |
90ddc4f0 | 38 | static const struct proto_ops llc_ui_ops; |
1da177e4 | 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 | */ | |
2342c990 | 56 | static inline u16 llc_ui_next_link_no(int sap) |
1da177e4 LT |
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 | */ | |
3fbd418a | 67 | static inline __be16 llc_proto_type(u16 arphrd) |
1da177e4 LT |
68 | { |
69 | return arphrd == ARPHRD_IEEE802_TR ? | |
d57b1869 | 70 | htons(ETH_P_TR_802_2) : htons(ETH_P_802_2); |
1da177e4 LT |
71 | } |
72 | ||
73 | /** | |
74 | * llc_ui_addr_null - determines if a address structure is null | |
75 | * @addr: Address to test if null. | |
76 | */ | |
2342c990 | 77 | static inline u8 llc_ui_addr_null(struct sockaddr_llc *addr) |
1da177e4 LT |
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 | */ | |
2342c990 | 91 | static inline u8 llc_ui_header_len(struct sock *sk, struct sockaddr_llc *addr) |
1da177e4 LT |
92 | { |
93 | u8 rc = LLC_PDU_LEN_U; | |
94 | ||
95 | if (addr->sllc_test || addr->sllc_xid) | |
96 | rc = LLC_PDU_LEN_U; | |
97 | else if (sk->sk_type == SOCK_STREAM) | |
98 | rc = LLC_PDU_LEN_I; | |
99 | return rc; | |
100 | } | |
101 | ||
102 | /** | |
103 | * llc_ui_send_data - send data via reliable llc2 connection | |
104 | * @sk: Connection the socket is using. | |
105 | * @skb: Data the user wishes to send. | |
106 | * @addr: Source and destination fields provided by the user. | |
107 | * @noblock: can we block waiting for data? | |
108 | * | |
109 | * Send data via reliable llc2 connection. | |
110 | * Returns 0 upon success, non-zero if action did not succeed. | |
111 | */ | |
112 | static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock) | |
113 | { | |
114 | struct llc_sock* llc = llc_sk(sk); | |
115 | int rc = 0; | |
116 | ||
d57b1869 | 117 | if (unlikely(llc_data_accept_state(llc->state) || |
451677c4 JF |
118 | llc->remote_busy_flag || |
119 | llc->p_flag)) { | |
54fb7f25 | 120 | long timeout = sock_sndtimeo(sk, noblock); |
1da177e4 LT |
121 | |
122 | rc = llc_ui_wait_for_busy_core(sk, timeout); | |
123 | } | |
249ff1c6 | 124 | if (unlikely(!rc)) |
1da177e4 LT |
125 | rc = llc_build_and_send_pkt(sk, skb); |
126 | return rc; | |
127 | } | |
128 | ||
129 | static void llc_ui_sk_init(struct socket *sock, struct sock *sk) | |
130 | { | |
131 | sk->sk_type = sock->type; | |
132 | sk->sk_sleep = &sock->wait; | |
133 | sk->sk_socket = sock; | |
134 | sock->sk = sk; | |
135 | sock->ops = &llc_ui_ops; | |
136 | } | |
137 | ||
138 | static struct proto llc_proto = { | |
9c005e01 | 139 | .name = "LLC", |
1da177e4 LT |
140 | .owner = THIS_MODULE, |
141 | .obj_size = sizeof(struct llc_sock), | |
142 | }; | |
143 | ||
144 | /** | |
145 | * llc_ui_create - alloc and init a new llc_ui socket | |
146 | * @sock: Socket to initialize and attach allocated sk to. | |
147 | * @protocol: Unused. | |
148 | * | |
149 | * Allocate and initialize a new llc_ui socket, validate the user wants a | |
150 | * socket type we have available. | |
151 | * Returns 0 upon success, negative upon failure. | |
152 | */ | |
153 | static int llc_ui_create(struct socket *sock, int protocol) | |
154 | { | |
155 | struct sock *sk; | |
156 | int rc = -ESOCKTNOSUPPORT; | |
157 | ||
af426d32 | 158 | if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) { |
1da177e4 LT |
159 | rc = -ENOMEM; |
160 | sk = llc_sk_alloc(PF_LLC, GFP_KERNEL, &llc_proto); | |
161 | if (sk) { | |
162 | rc = 0; | |
163 | llc_ui_sk_init(sock, sk); | |
164 | } | |
165 | } | |
166 | return rc; | |
167 | } | |
168 | ||
169 | /** | |
170 | * llc_ui_release - shutdown socket | |
171 | * @sock: Socket to release. | |
172 | * | |
173 | * Shutdown and deallocate an existing socket. | |
174 | */ | |
175 | static int llc_ui_release(struct socket *sock) | |
176 | { | |
177 | struct sock *sk = sock->sk; | |
178 | struct llc_sock *llc; | |
179 | ||
af426d32 | 180 | if (unlikely(sk == NULL)) |
1da177e4 LT |
181 | goto out; |
182 | sock_hold(sk); | |
183 | lock_sock(sk); | |
184 | llc = llc_sk(sk); | |
185 | dprintk("%s: closing local(%02X) remote(%02X)\n", __FUNCTION__, | |
186 | llc->laddr.lsap, llc->daddr.lsap); | |
187 | if (!llc_send_disc(sk)) | |
188 | llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); | |
2e1f47c7 ACM |
189 | if (!sock_flag(sk, SOCK_ZAPPED)) { |
190 | llc_sap_put(llc->sap); | |
1da177e4 | 191 | llc_sap_remove_socket(llc->sap, sk); |
2e1f47c7 | 192 | } |
1da177e4 | 193 | release_sock(sk); |
1da177e4 LT |
194 | if (llc->dev) |
195 | dev_put(llc->dev); | |
196 | sock_put(sk); | |
197 | llc_sk_free(sk); | |
198 | out: | |
199 | return 0; | |
200 | } | |
201 | ||
202 | /** | |
203 | * llc_ui_autoport - provide dynamically allocate SAP number | |
204 | * | |
205 | * Provide the caller with a dynamically allocated SAP number according | |
206 | * to the rules that are set in this function. Returns: 0, upon failure, | |
207 | * SAP number otherwise. | |
208 | */ | |
209 | static int llc_ui_autoport(void) | |
210 | { | |
211 | struct llc_sap *sap; | |
212 | int i, tries = 0; | |
213 | ||
214 | while (tries < LLC_SAP_DYN_TRIES) { | |
215 | for (i = llc_ui_sap_last_autoport; | |
216 | i < LLC_SAP_DYN_STOP; i += 2) { | |
217 | sap = llc_sap_find(i); | |
218 | if (!sap) { | |
219 | llc_ui_sap_last_autoport = i + 2; | |
220 | goto out; | |
221 | } | |
6e2144b7 | 222 | llc_sap_put(sap); |
1da177e4 LT |
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 | 300 | goto out; |
cf309e3f JF |
301 | rc = -ENODEV; |
302 | rtnl_lock(); | |
303 | llc->dev = dev_getbyhwaddr(addr->sllc_arphrd, addr->sllc_mac); | |
304 | rtnl_unlock(); | |
305 | if (!llc->dev) | |
306 | goto out; | |
1da177e4 LT |
307 | if (!addr->sllc_sap) { |
308 | rc = -EUSERS; | |
309 | addr->sllc_sap = llc_ui_autoport(); | |
310 | if (!addr->sllc_sap) | |
311 | goto out; | |
312 | } | |
313 | sap = llc_sap_find(addr->sllc_sap); | |
314 | if (!sap) { | |
315 | sap = llc_sap_open(addr->sllc_sap, NULL); | |
316 | rc = -EBUSY; /* some other network layer is using the sap */ | |
317 | if (!sap) | |
318 | goto out; | |
6e2144b7 | 319 | llc_sap_hold(sap); |
1da177e4 LT |
320 | } else { |
321 | struct llc_addr laddr, daddr; | |
322 | struct sock *ask; | |
323 | ||
324 | memset(&laddr, 0, sizeof(laddr)); | |
325 | memset(&daddr, 0, sizeof(daddr)); | |
326 | /* | |
59c51591 | 327 | * FIXME: check if the address is multicast, |
1da177e4 LT |
328 | * only SOCK_DGRAM can do this. |
329 | */ | |
330 | memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
331 | laddr.lsap = addr->sllc_sap; | |
332 | rc = -EADDRINUSE; /* mac + sap clash. */ | |
333 | ask = llc_lookup_established(sap, &daddr, &laddr); | |
334 | if (ask) { | |
335 | sock_put(ask); | |
6e2144b7 | 336 | goto out_put; |
1da177e4 LT |
337 | } |
338 | } | |
339 | llc->laddr.lsap = addr->sllc_sap; | |
340 | memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
341 | memcpy(&llc->addr, addr, sizeof(llc->addr)); | |
342 | /* assign new connection to its SAP */ | |
343 | llc_sap_add_socket(sap, sk); | |
344 | sock_reset_flag(sk, SOCK_ZAPPED); | |
345 | rc = 0; | |
6e2144b7 ACM |
346 | out_put: |
347 | llc_sap_put(sap); | |
1da177e4 LT |
348 | out: |
349 | return rc; | |
350 | } | |
351 | ||
352 | /** | |
353 | * llc_ui_shutdown - shutdown a connect llc2 socket. | |
354 | * @sock: Socket to shutdown. | |
355 | * @how: What part of the socket to shutdown. | |
356 | * | |
357 | * Shutdown a connected llc2 socket. Currently this function only supports | |
358 | * shutting down both sends and receives (2), we could probably make this | |
359 | * function such that a user can shutdown only half the connection but not | |
360 | * right now. | |
361 | * Returns: 0 upon success, negative otherwise. | |
362 | */ | |
363 | static int llc_ui_shutdown(struct socket *sock, int how) | |
364 | { | |
365 | struct sock *sk = sock->sk; | |
366 | int rc = -ENOTCONN; | |
367 | ||
368 | lock_sock(sk); | |
af426d32 | 369 | if (unlikely(sk->sk_state != TCP_ESTABLISHED)) |
1da177e4 LT |
370 | goto out; |
371 | rc = -EINVAL; | |
372 | if (how != 2) | |
373 | goto out; | |
374 | rc = llc_send_disc(sk); | |
375 | if (!rc) | |
376 | rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); | |
377 | /* Wake up anyone sleeping in poll */ | |
378 | sk->sk_state_change(sk); | |
379 | out: | |
380 | release_sock(sk); | |
381 | return rc; | |
382 | } | |
383 | ||
384 | /** | |
385 | * llc_ui_connect - Connect to a remote llc2 mac + sap. | |
386 | * @sock: Socket which will be connected to the remote destination. | |
387 | * @uaddr: Remote and possibly the local address of the new connection. | |
388 | * @addrlen: Size of uaddr structure. | |
389 | * @flags: Operational flags specified by the user. | |
390 | * | |
391 | * Connect to a remote llc2 mac + sap. The caller must specify the | |
392 | * destination mac and address to connect to. If the user hasn't previously | |
393 | * called bind(2) with a smac the address of the first interface of the | |
394 | * specified arp type will be used. | |
395 | * This function will autobind if user did not previously call bind. | |
396 | * Returns: 0 upon success, negative otherwise. | |
397 | */ | |
398 | static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr, | |
399 | int addrlen, int flags) | |
400 | { | |
401 | struct sock *sk = sock->sk; | |
402 | struct llc_sock *llc = llc_sk(sk); | |
403 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; | |
1da177e4 LT |
404 | int rc = -EINVAL; |
405 | ||
406 | lock_sock(sk); | |
af426d32 | 407 | if (unlikely(addrlen != sizeof(*addr))) |
1da177e4 LT |
408 | goto out; |
409 | rc = -EAFNOSUPPORT; | |
af426d32 ACM |
410 | if (unlikely(addr->sllc_family != AF_LLC)) |
411 | goto out; | |
412 | if (unlikely(sk->sk_type != SOCK_STREAM)) | |
413 | goto out; | |
414 | rc = -EALREADY; | |
415 | if (unlikely(sock->state == SS_CONNECTING)) | |
1da177e4 LT |
416 | goto out; |
417 | /* bind connection to sap if user hasn't done it. */ | |
418 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
419 | /* bind to sap with null dev, exclusive */ | |
420 | rc = llc_ui_autobind(sock, addr); | |
421 | if (rc) | |
422 | goto out; | |
1da177e4 | 423 | } |
5564af21 JF |
424 | llc->daddr.lsap = addr->sllc_sap; |
425 | memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
1da177e4 LT |
426 | sock->state = SS_CONNECTING; |
427 | sk->sk_state = TCP_SYN_SENT; | |
428 | llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap); | |
774ccb4f | 429 | rc = llc_establish_connection(sk, llc->dev->dev_addr, |
1da177e4 LT |
430 | addr->sllc_mac, addr->sllc_sap); |
431 | if (rc) { | |
432 | dprintk("%s: llc_ui_send_conn failed :-(\n", __FUNCTION__); | |
433 | sock->state = SS_UNCONNECTED; | |
434 | sk->sk_state = TCP_CLOSE; | |
435 | goto out; | |
436 | } | |
b35bd110 ACM |
437 | |
438 | if (sk->sk_state == TCP_SYN_SENT) { | |
54fb7f25 | 439 | const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
b35bd110 ACM |
440 | |
441 | if (!timeo || !llc_ui_wait_for_conn(sk, timeo)) | |
442 | goto out; | |
443 | ||
444 | rc = sock_intr_errno(timeo); | |
445 | if (signal_pending(current)) | |
446 | goto out; | |
447 | } | |
448 | ||
449 | if (sk->sk_state == TCP_CLOSE) | |
450 | goto sock_error; | |
451 | ||
452 | sock->state = SS_CONNECTED; | |
453 | rc = 0; | |
1da177e4 LT |
454 | out: |
455 | release_sock(sk); | |
456 | return rc; | |
b35bd110 ACM |
457 | sock_error: |
458 | rc = sock_error(sk) ? : -ECONNABORTED; | |
459 | sock->state = SS_UNCONNECTED; | |
460 | goto out; | |
1da177e4 LT |
461 | } |
462 | ||
463 | /** | |
464 | * llc_ui_listen - allow a normal socket to accept incoming connections | |
465 | * @sock: Socket to allow incoming connections on. | |
466 | * @backlog: Number of connections to queue. | |
467 | * | |
468 | * Allow a normal socket to accept incoming connections. | |
469 | * Returns 0 upon success, negative otherwise. | |
470 | */ | |
471 | static int llc_ui_listen(struct socket *sock, int backlog) | |
472 | { | |
473 | struct sock *sk = sock->sk; | |
474 | int rc = -EINVAL; | |
475 | ||
476 | lock_sock(sk); | |
af426d32 | 477 | if (unlikely(sock->state != SS_UNCONNECTED)) |
1da177e4 LT |
478 | goto out; |
479 | rc = -EOPNOTSUPP; | |
af426d32 | 480 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
1da177e4 LT |
481 | goto out; |
482 | rc = -EAGAIN; | |
483 | if (sock_flag(sk, SOCK_ZAPPED)) | |
484 | goto out; | |
485 | rc = 0; | |
486 | if (!(unsigned)backlog) /* BSDism */ | |
487 | backlog = 1; | |
488 | sk->sk_max_ack_backlog = backlog; | |
489 | if (sk->sk_state != TCP_LISTEN) { | |
490 | sk->sk_ack_backlog = 0; | |
491 | sk->sk_state = TCP_LISTEN; | |
492 | } | |
493 | sk->sk_socket->flags |= __SO_ACCEPTCON; | |
494 | out: | |
495 | release_sock(sk); | |
496 | return rc; | |
497 | } | |
498 | ||
54fb7f25 | 499 | static int llc_ui_wait_for_disc(struct sock *sk, long timeout) |
1da177e4 | 500 | { |
b35bd110 ACM |
501 | DEFINE_WAIT(wait); |
502 | int rc = 0; | |
1da177e4 | 503 | |
54fb7f25 ACM |
504 | while (1) { |
505 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
506 | if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE)) | |
507 | break; | |
1da177e4 LT |
508 | rc = -ERESTARTSYS; |
509 | if (signal_pending(current)) | |
510 | break; | |
511 | rc = -EAGAIN; | |
512 | if (!timeout) | |
513 | break; | |
b35bd110 | 514 | rc = 0; |
1da177e4 | 515 | } |
b35bd110 | 516 | finish_wait(sk->sk_sleep, &wait); |
1da177e4 LT |
517 | return rc; |
518 | } | |
519 | ||
54fb7f25 | 520 | static int llc_ui_wait_for_conn(struct sock *sk, long timeout) |
1da177e4 | 521 | { |
b35bd110 | 522 | DEFINE_WAIT(wait); |
1da177e4 | 523 | |
54fb7f25 ACM |
524 | while (1) { |
525 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
526 | if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT)) | |
527 | break; | |
b35bd110 | 528 | if (signal_pending(current) || !timeout) |
1da177e4 LT |
529 | break; |
530 | } | |
b35bd110 ACM |
531 | finish_wait(sk->sk_sleep, &wait); |
532 | return timeout; | |
1da177e4 LT |
533 | } |
534 | ||
afdbe357 | 535 | static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout) |
1da177e4 | 536 | { |
b35bd110 | 537 | DEFINE_WAIT(wait); |
afdbe357 ACM |
538 | struct llc_sock *llc = llc_sk(sk); |
539 | int rc; | |
1da177e4 | 540 | |
54fb7f25 | 541 | while (1) { |
b35bd110 | 542 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
afdbe357 | 543 | rc = 0; |
54fb7f25 ACM |
544 | if (sk_wait_event(sk, &timeout, |
545 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
afdbe357 | 546 | (!llc_data_accept_state(llc->state) && |
451677c4 | 547 | !llc->remote_busy_flag && |
afdbe357 | 548 | !llc->p_flag))) |
1da177e4 | 549 | break; |
1da177e4 LT |
550 | rc = -ERESTARTSYS; |
551 | if (signal_pending(current)) | |
552 | break; | |
553 | rc = -EAGAIN; | |
554 | if (!timeout) | |
555 | break; | |
556 | } | |
b35bd110 | 557 | finish_wait(sk->sk_sleep, &wait); |
1da177e4 LT |
558 | return rc; |
559 | } | |
560 | ||
2928c19e | 561 | static int llc_wait_data(struct sock *sk, long timeo) |
1da177e4 | 562 | { |
1da177e4 LT |
563 | int rc; |
564 | ||
54fb7f25 | 565 | while (1) { |
afdbe357 ACM |
566 | /* |
567 | * POSIX 1003.1g mandates this order. | |
568 | */ | |
c1cbe4b7 BL |
569 | rc = sock_error(sk); |
570 | if (rc) | |
afdbe357 | 571 | break; |
1da177e4 | 572 | rc = 0; |
afdbe357 | 573 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
1da177e4 | 574 | break; |
afdbe357 ACM |
575 | rc = -EAGAIN; |
576 | if (!timeo) | |
577 | break; | |
578 | rc = sock_intr_errno(timeo); | |
1da177e4 LT |
579 | if (signal_pending(current)) |
580 | break; | |
afdbe357 ACM |
581 | rc = 0; |
582 | if (sk_wait_data(sk, &timeo)) | |
1da177e4 LT |
583 | break; |
584 | } | |
1da177e4 LT |
585 | return rc; |
586 | } | |
587 | ||
588 | /** | |
589 | * llc_ui_accept - accept a new incoming connection. | |
590 | * @sock: Socket which connections arrive on. | |
591 | * @newsock: Socket to move incoming connection to. | |
592 | * @flags: User specified operational flags. | |
593 | * | |
594 | * Accept a new incoming connection. | |
595 | * Returns 0 upon success, negative otherwise. | |
596 | */ | |
597 | static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags) | |
598 | { | |
599 | struct sock *sk = sock->sk, *newsk; | |
600 | struct llc_sock *llc, *newllc; | |
601 | struct sk_buff *skb; | |
602 | int rc = -EOPNOTSUPP; | |
603 | ||
604 | dprintk("%s: accepting on %02X\n", __FUNCTION__, | |
d57b1869 | 605 | llc_sk(sk)->laddr.lsap); |
1da177e4 | 606 | lock_sock(sk); |
af426d32 | 607 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
1da177e4 LT |
608 | goto out; |
609 | rc = -EINVAL; | |
af426d32 ACM |
610 | if (unlikely(sock->state != SS_UNCONNECTED || |
611 | sk->sk_state != TCP_LISTEN)) | |
1da177e4 LT |
612 | goto out; |
613 | /* wait for a connection to arrive. */ | |
b35bd110 | 614 | if (skb_queue_empty(&sk->sk_receive_queue)) { |
afdbe357 | 615 | rc = llc_wait_data(sk, sk->sk_rcvtimeo); |
b35bd110 ACM |
616 | if (rc) |
617 | goto out; | |
618 | } | |
1da177e4 | 619 | dprintk("%s: got a new connection on %02X\n", __FUNCTION__, |
d57b1869 | 620 | llc_sk(sk)->laddr.lsap); |
1da177e4 LT |
621 | skb = skb_dequeue(&sk->sk_receive_queue); |
622 | rc = -EINVAL; | |
623 | if (!skb->sk) | |
624 | goto frees; | |
625 | rc = 0; | |
626 | newsk = skb->sk; | |
627 | /* attach connection to a new socket. */ | |
628 | llc_ui_sk_init(newsock, newsk); | |
629 | sock_reset_flag(newsk, SOCK_ZAPPED); | |
630 | newsk->sk_state = TCP_ESTABLISHED; | |
631 | newsock->state = SS_CONNECTED; | |
632 | llc = llc_sk(sk); | |
633 | newllc = llc_sk(newsk); | |
634 | memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr)); | |
635 | newllc->link = llc_ui_next_link_no(newllc->laddr.lsap); | |
636 | ||
637 | /* put original socket back into a clean listen state. */ | |
638 | sk->sk_state = TCP_LISTEN; | |
639 | sk->sk_ack_backlog--; | |
1da177e4 LT |
640 | dprintk("%s: ok success on %02X, client on %02X\n", __FUNCTION__, |
641 | llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap); | |
642 | frees: | |
643 | kfree_skb(skb); | |
644 | out: | |
645 | release_sock(sk); | |
646 | return rc; | |
647 | } | |
648 | ||
649 | /** | |
650 | * llc_ui_recvmsg - copy received data to the socket user. | |
651 | * @sock: Socket to copy data from. | |
652 | * @msg: Various user space related information. | |
8420e1b5 | 653 | * @len: Size of user buffer. |
1da177e4 LT |
654 | * @flags: User specified flags. |
655 | * | |
656 | * Copy received data to the socket user. | |
657 | * Returns non-negative upon success, negative otherwise. | |
658 | */ | |
659 | static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock, | |
8420e1b5 | 660 | struct msghdr *msg, size_t len, int flags) |
1da177e4 | 661 | { |
1da177e4 | 662 | struct sockaddr_llc *uaddr = (struct sockaddr_llc *)msg->msg_name; |
8420e1b5 ACM |
663 | const int nonblock = flags & MSG_DONTWAIT; |
664 | struct sk_buff *skb = NULL; | |
665 | struct sock *sk = sock->sk; | |
666 | struct llc_sock *llc = llc_sk(sk); | |
1da177e4 | 667 | size_t copied = 0; |
8420e1b5 ACM |
668 | u32 peek_seq = 0; |
669 | u32 *seq; | |
670 | unsigned long used; | |
671 | int target; /* Read at least this many bytes */ | |
672 | long timeo; | |
1da177e4 | 673 | |
1da177e4 | 674 | lock_sock(sk); |
8420e1b5 | 675 | copied = -ENOTCONN; |
29efcd26 | 676 | if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN)) |
1da177e4 | 677 | goto out; |
8420e1b5 ACM |
678 | |
679 | timeo = sock_rcvtimeo(sk, nonblock); | |
680 | ||
681 | seq = &llc->copied_seq; | |
682 | if (flags & MSG_PEEK) { | |
683 | peek_seq = llc->copied_seq; | |
684 | seq = &peek_seq; | |
d57b1869 | 685 | } |
8420e1b5 ACM |
686 | |
687 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
688 | copied = 0; | |
689 | ||
690 | do { | |
691 | u32 offset; | |
692 | ||
693 | /* | |
694 | * We need to check signals first, to get correct SIGURG | |
695 | * handling. FIXME: Need to check this doesn't impact 1003.1g | |
696 | * and move it down to the bottom of the loop | |
697 | */ | |
698 | if (signal_pending(current)) { | |
699 | if (copied) | |
700 | break; | |
701 | copied = timeo ? sock_intr_errno(timeo) : -EAGAIN; | |
702 | break; | |
703 | } | |
704 | ||
705 | /* Next get a buffer. */ | |
706 | ||
707 | skb = skb_peek(&sk->sk_receive_queue); | |
708 | if (skb) { | |
709 | offset = *seq; | |
710 | goto found_ok_skb; | |
711 | } | |
712 | /* Well, if we have backlog, try to process it now yet. */ | |
713 | ||
714 | if (copied >= target && !sk->sk_backlog.tail) | |
715 | break; | |
716 | ||
717 | if (copied) { | |
718 | if (sk->sk_err || | |
719 | sk->sk_state == TCP_CLOSE || | |
720 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
721 | !timeo || | |
722 | (flags & MSG_PEEK)) | |
723 | break; | |
724 | } else { | |
725 | if (sock_flag(sk, SOCK_DONE)) | |
726 | break; | |
727 | ||
728 | if (sk->sk_err) { | |
729 | copied = sock_error(sk); | |
730 | break; | |
731 | } | |
732 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
733 | break; | |
734 | ||
29efcd26 | 735 | if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) { |
8420e1b5 ACM |
736 | if (!sock_flag(sk, SOCK_DONE)) { |
737 | /* | |
738 | * This occurs when user tries to read | |
739 | * from never connected socket. | |
740 | */ | |
741 | copied = -ENOTCONN; | |
742 | break; | |
743 | } | |
744 | break; | |
745 | } | |
746 | if (!timeo) { | |
747 | copied = -EAGAIN; | |
748 | break; | |
749 | } | |
750 | } | |
751 | ||
752 | if (copied >= target) { /* Do not sleep, just process backlog. */ | |
753 | release_sock(sk); | |
754 | lock_sock(sk); | |
755 | } else | |
756 | sk_wait_data(sk, &timeo); | |
757 | ||
758 | if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) { | |
759 | if (net_ratelimit()) | |
760 | printk(KERN_DEBUG "LLC(%s:%d): Application " | |
761 | "bug, race in MSG_PEEK.\n", | |
762 | current->comm, current->pid); | |
763 | peek_seq = llc->copied_seq; | |
764 | } | |
765 | continue; | |
766 | found_ok_skb: | |
767 | /* Ok so how much can we use? */ | |
768 | used = skb->len - offset; | |
769 | if (len < used) | |
770 | used = len; | |
771 | ||
772 | if (!(flags & MSG_TRUNC)) { | |
773 | int rc = skb_copy_datagram_iovec(skb, offset, | |
774 | msg->msg_iov, used); | |
775 | if (rc) { | |
776 | /* Exception. Bailout! */ | |
777 | if (!copied) | |
778 | copied = -EFAULT; | |
779 | break; | |
780 | } | |
781 | } | |
782 | ||
783 | *seq += used; | |
784 | copied += used; | |
785 | len -= used; | |
786 | ||
8420e1b5 | 787 | if (!(flags & MSG_PEEK)) { |
624d1164 | 788 | sk_eat_skb(sk, skb, 0); |
8420e1b5 ACM |
789 | *seq = 0; |
790 | } | |
30a584d9 SH |
791 | |
792 | /* For non stream protcols we get one packet per recvmsg call */ | |
793 | if (sk->sk_type != SOCK_STREAM) | |
794 | goto copy_uaddr; | |
795 | ||
796 | /* Partial read */ | |
797 | if (used + offset < skb->len) | |
798 | continue; | |
8420e1b5 ACM |
799 | } while (len > 0); |
800 | ||
1da177e4 LT |
801 | out: |
802 | release_sock(sk); | |
8420e1b5 ACM |
803 | return copied; |
804 | copy_uaddr: | |
805 | if (uaddr != NULL && skb != NULL) { | |
806 | memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr)); | |
807 | msg->msg_namelen = sizeof(*uaddr); | |
808 | } | |
809 | goto out; | |
1da177e4 LT |
810 | } |
811 | ||
812 | /** | |
813 | * llc_ui_sendmsg - Transmit data provided by the socket user. | |
814 | * @sock: Socket to transmit data from. | |
815 | * @msg: Various user related information. | |
816 | * @len: Length of data to transmit. | |
817 | * | |
818 | * Transmit data provided by the socket user. | |
819 | * Returns non-negative upon success, negative otherwise. | |
820 | */ | |
821 | static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock, | |
822 | struct msghdr *msg, size_t len) | |
823 | { | |
824 | struct sock *sk = sock->sk; | |
825 | struct llc_sock *llc = llc_sk(sk); | |
826 | struct sockaddr_llc *addr = (struct sockaddr_llc *)msg->msg_name; | |
827 | int flags = msg->msg_flags; | |
828 | int noblock = flags & MSG_DONTWAIT; | |
1da177e4 LT |
829 | struct sk_buff *skb; |
830 | size_t size = 0; | |
831 | int rc = -EINVAL, copied = 0, hdrlen; | |
832 | ||
833 | dprintk("%s: sending from %02X to %02X\n", __FUNCTION__, | |
834 | llc->laddr.lsap, llc->daddr.lsap); | |
835 | lock_sock(sk); | |
836 | if (addr) { | |
837 | if (msg->msg_namelen < sizeof(*addr)) | |
838 | goto release; | |
839 | } else { | |
840 | if (llc_ui_addr_null(&llc->addr)) | |
841 | goto release; | |
842 | addr = &llc->addr; | |
843 | } | |
844 | /* must bind connection to sap if user hasn't done it. */ | |
845 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
846 | /* bind to sap with null dev, exclusive. */ | |
847 | rc = llc_ui_autobind(sock, addr); | |
848 | if (rc) | |
849 | goto release; | |
850 | } | |
774ccb4f | 851 | hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr); |
1da177e4 | 852 | size = hdrlen + len; |
774ccb4f ACM |
853 | if (size > llc->dev->mtu) |
854 | size = llc->dev->mtu; | |
1da177e4 LT |
855 | copied = size - hdrlen; |
856 | release_sock(sk); | |
857 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
858 | lock_sock(sk); | |
859 | if (!skb) | |
860 | goto release; | |
774ccb4f | 861 | skb->dev = llc->dev; |
1da177e4 | 862 | skb->protocol = llc_proto_type(addr->sllc_arphrd); |
d57b1869 | 863 | skb_reserve(skb, hdrlen); |
1da177e4 LT |
864 | rc = memcpy_fromiovec(skb_put(skb, copied), msg->msg_iov, copied); |
865 | if (rc) | |
866 | goto out; | |
867 | if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) { | |
868 | llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac, | |
869 | addr->sllc_sap); | |
870 | goto out; | |
871 | } | |
872 | if (addr->sllc_test) { | |
873 | llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac, | |
874 | addr->sllc_sap); | |
875 | goto out; | |
876 | } | |
877 | if (addr->sllc_xid) { | |
878 | llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac, | |
879 | addr->sllc_sap); | |
880 | goto out; | |
881 | } | |
882 | rc = -ENOPROTOOPT; | |
883 | if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua)) | |
884 | goto out; | |
885 | rc = llc_ui_send_data(sk, skb, noblock); | |
1da177e4 | 886 | out: |
249ff1c6 | 887 | if (rc) { |
1da177e4 LT |
888 | kfree_skb(skb); |
889 | release: | |
1da177e4 LT |
890 | dprintk("%s: failed sending from %02X to %02X: %d\n", |
891 | __FUNCTION__, llc->laddr.lsap, llc->daddr.lsap, rc); | |
249ff1c6 | 892 | } |
1da177e4 LT |
893 | release_sock(sk); |
894 | return rc ? : copied; | |
895 | } | |
896 | ||
897 | /** | |
898 | * llc_ui_getname - return the address info of a socket | |
899 | * @sock: Socket to get address of. | |
900 | * @uaddr: Address structure to return information. | |
901 | * @uaddrlen: Length of address structure. | |
902 | * @peer: Does user want local or remote address information. | |
903 | * | |
904 | * Return the address information of a socket. | |
905 | */ | |
906 | static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr, | |
907 | int *uaddrlen, int peer) | |
908 | { | |
909 | struct sockaddr_llc sllc; | |
910 | struct sock *sk = sock->sk; | |
911 | struct llc_sock *llc = llc_sk(sk); | |
912 | int rc = 0; | |
913 | ||
914 | lock_sock(sk); | |
915 | if (sock_flag(sk, SOCK_ZAPPED)) | |
916 | goto out; | |
917 | *uaddrlen = sizeof(sllc); | |
918 | memset(uaddr, 0, *uaddrlen); | |
919 | if (peer) { | |
920 | rc = -ENOTCONN; | |
921 | if (sk->sk_state != TCP_ESTABLISHED) | |
922 | goto out; | |
923 | if(llc->dev) | |
924 | sllc.sllc_arphrd = llc->dev->type; | |
925 | sllc.sllc_sap = llc->daddr.lsap; | |
926 | memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN); | |
927 | } else { | |
928 | rc = -EINVAL; | |
929 | if (!llc->sap) | |
930 | goto out; | |
931 | sllc.sllc_sap = llc->sap->laddr.lsap; | |
932 | ||
933 | if (llc->dev) { | |
934 | sllc.sllc_arphrd = llc->dev->type; | |
935 | memcpy(&sllc.sllc_mac, &llc->dev->dev_addr, | |
936 | IFHWADDRLEN); | |
937 | } | |
938 | } | |
939 | rc = 0; | |
940 | sllc.sllc_family = AF_LLC; | |
941 | memcpy(uaddr, &sllc, sizeof(sllc)); | |
942 | out: | |
943 | release_sock(sk); | |
944 | return rc; | |
945 | } | |
946 | ||
947 | /** | |
948 | * llc_ui_ioctl - io controls for PF_LLC | |
949 | * @sock: Socket to get/set info | |
950 | * @cmd: command | |
951 | * @arg: optional argument for cmd | |
952 | * | |
953 | * get/set info on llc sockets | |
954 | */ | |
955 | static int llc_ui_ioctl(struct socket *sock, unsigned int cmd, | |
956 | unsigned long arg) | |
957 | { | |
b5e5fa5e | 958 | return -ENOIOCTLCMD; |
1da177e4 LT |
959 | } |
960 | ||
961 | /** | |
962 | * llc_ui_setsockopt - set various connection specific parameters. | |
963 | * @sock: Socket to set options on. | |
964 | * @level: Socket level user is requesting operations on. | |
965 | * @optname: Operation name. | |
966 | * @optval User provided operation data. | |
967 | * @optlen: Length of optval. | |
968 | * | |
969 | * Set various connection specific parameters. | |
970 | */ | |
971 | static int llc_ui_setsockopt(struct socket *sock, int level, int optname, | |
972 | char __user *optval, int optlen) | |
973 | { | |
974 | struct sock *sk = sock->sk; | |
975 | struct llc_sock *llc = llc_sk(sk); | |
976 | int rc = -EINVAL, opt; | |
977 | ||
978 | lock_sock(sk); | |
af426d32 | 979 | if (unlikely(level != SOL_LLC || optlen != sizeof(int))) |
1da177e4 LT |
980 | goto out; |
981 | rc = get_user(opt, (int __user *)optval); | |
982 | if (rc) | |
983 | goto out; | |
984 | rc = -EINVAL; | |
985 | switch (optname) { | |
986 | case LLC_OPT_RETRY: | |
987 | if (opt > LLC_OPT_MAX_RETRY) | |
988 | goto out; | |
989 | llc->n2 = opt; | |
990 | break; | |
991 | case LLC_OPT_SIZE: | |
992 | if (opt > LLC_OPT_MAX_SIZE) | |
993 | goto out; | |
994 | llc->n1 = opt; | |
995 | break; | |
996 | case LLC_OPT_ACK_TMR_EXP: | |
997 | if (opt > LLC_OPT_MAX_ACK_TMR_EXP) | |
998 | goto out; | |
590232a7 | 999 | llc->ack_timer.expire = opt * HZ; |
1da177e4 LT |
1000 | break; |
1001 | case LLC_OPT_P_TMR_EXP: | |
1002 | if (opt > LLC_OPT_MAX_P_TMR_EXP) | |
1003 | goto out; | |
590232a7 | 1004 | llc->pf_cycle_timer.expire = opt * HZ; |
1da177e4 LT |
1005 | break; |
1006 | case LLC_OPT_REJ_TMR_EXP: | |
1007 | if (opt > LLC_OPT_MAX_REJ_TMR_EXP) | |
1008 | goto out; | |
590232a7 | 1009 | llc->rej_sent_timer.expire = opt * HZ; |
1da177e4 LT |
1010 | break; |
1011 | case LLC_OPT_BUSY_TMR_EXP: | |
1012 | if (opt > LLC_OPT_MAX_BUSY_TMR_EXP) | |
1013 | goto out; | |
590232a7 | 1014 | llc->busy_state_timer.expire = opt * HZ; |
1da177e4 LT |
1015 | break; |
1016 | case LLC_OPT_TX_WIN: | |
1017 | if (opt > LLC_OPT_MAX_WIN) | |
1018 | goto out; | |
1019 | llc->k = opt; | |
1020 | break; | |
1021 | case LLC_OPT_RX_WIN: | |
1022 | if (opt > LLC_OPT_MAX_WIN) | |
1023 | goto out; | |
1024 | llc->rw = opt; | |
1025 | break; | |
1026 | default: | |
1027 | rc = -ENOPROTOOPT; | |
1028 | goto out; | |
1029 | } | |
1030 | rc = 0; | |
1031 | out: | |
1032 | release_sock(sk); | |
1033 | return rc; | |
1034 | } | |
1035 | ||
1036 | /** | |
1037 | * llc_ui_getsockopt - get connection specific socket info | |
1038 | * @sock: Socket to get information from. | |
1039 | * @level: Socket level user is requesting operations on. | |
1040 | * @optname: Operation name. | |
1041 | * @optval: Variable to return operation data in. | |
1042 | * @optlen: Length of optval. | |
1043 | * | |
1044 | * Get connection specific socket information. | |
1045 | */ | |
1046 | static int llc_ui_getsockopt(struct socket *sock, int level, int optname, | |
1047 | char __user *optval, int __user *optlen) | |
1048 | { | |
1049 | struct sock *sk = sock->sk; | |
1050 | struct llc_sock *llc = llc_sk(sk); | |
1051 | int val = 0, len = 0, rc = -EINVAL; | |
1052 | ||
1053 | lock_sock(sk); | |
af426d32 | 1054 | if (unlikely(level != SOL_LLC)) |
1da177e4 LT |
1055 | goto out; |
1056 | rc = get_user(len, optlen); | |
1057 | if (rc) | |
1058 | goto out; | |
1059 | rc = -EINVAL; | |
1060 | if (len != sizeof(int)) | |
1061 | goto out; | |
1062 | switch (optname) { | |
1063 | case LLC_OPT_RETRY: | |
590232a7 | 1064 | val = llc->n2; break; |
1da177e4 | 1065 | case LLC_OPT_SIZE: |
590232a7 | 1066 | val = llc->n1; break; |
1da177e4 | 1067 | case LLC_OPT_ACK_TMR_EXP: |
590232a7 | 1068 | val = llc->ack_timer.expire / HZ; break; |
1da177e4 | 1069 | case LLC_OPT_P_TMR_EXP: |
590232a7 | 1070 | val = llc->pf_cycle_timer.expire / HZ; break; |
1da177e4 | 1071 | case LLC_OPT_REJ_TMR_EXP: |
590232a7 | 1072 | val = llc->rej_sent_timer.expire / HZ; break; |
1da177e4 | 1073 | case LLC_OPT_BUSY_TMR_EXP: |
590232a7 | 1074 | val = llc->busy_state_timer.expire / HZ; break; |
1da177e4 LT |
1075 | case LLC_OPT_TX_WIN: |
1076 | val = llc->k; break; | |
1077 | case LLC_OPT_RX_WIN: | |
1078 | val = llc->rw; break; | |
1079 | default: | |
1080 | rc = -ENOPROTOOPT; | |
1081 | goto out; | |
1082 | } | |
1083 | rc = 0; | |
1084 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) | |
1085 | rc = -EFAULT; | |
1086 | out: | |
1087 | release_sock(sk); | |
1088 | return rc; | |
1089 | } | |
1090 | ||
1091 | static struct net_proto_family llc_ui_family_ops = { | |
1092 | .family = PF_LLC, | |
1093 | .create = llc_ui_create, | |
1094 | .owner = THIS_MODULE, | |
1095 | }; | |
1096 | ||
90ddc4f0 | 1097 | static const struct proto_ops llc_ui_ops = { |
1da177e4 LT |
1098 | .family = PF_LLC, |
1099 | .owner = THIS_MODULE, | |
1100 | .release = llc_ui_release, | |
1101 | .bind = llc_ui_bind, | |
1102 | .connect = llc_ui_connect, | |
1103 | .socketpair = sock_no_socketpair, | |
1104 | .accept = llc_ui_accept, | |
1105 | .getname = llc_ui_getname, | |
1106 | .poll = datagram_poll, | |
1107 | .ioctl = llc_ui_ioctl, | |
1108 | .listen = llc_ui_listen, | |
1109 | .shutdown = llc_ui_shutdown, | |
1110 | .setsockopt = llc_ui_setsockopt, | |
1111 | .getsockopt = llc_ui_getsockopt, | |
1112 | .sendmsg = llc_ui_sendmsg, | |
1113 | .recvmsg = llc_ui_recvmsg, | |
1114 | .mmap = sock_no_mmap, | |
1115 | .sendpage = sock_no_sendpage, | |
1116 | }; | |
1117 | ||
590232a7 | 1118 | static char llc_proc_err_msg[] __initdata = |
d57b1869 | 1119 | KERN_CRIT "LLC: Unable to register the proc_fs entries\n"; |
590232a7 | 1120 | static char llc_sysctl_err_msg[] __initdata = |
d57b1869 | 1121 | KERN_CRIT "LLC: Unable to register the sysctl entries\n"; |
590232a7 | 1122 | static char llc_sock_err_msg[] __initdata = |
d57b1869 | 1123 | KERN_CRIT "LLC: Unable to register the network family\n"; |
590232a7 | 1124 | |
1da177e4 LT |
1125 | static int __init llc2_init(void) |
1126 | { | |
1127 | int rc = proto_register(&llc_proto, 0); | |
1128 | ||
1129 | if (rc != 0) | |
1130 | goto out; | |
1131 | ||
1132 | llc_build_offset_table(); | |
1133 | llc_station_init(); | |
1134 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; | |
1135 | rc = llc_proc_init(); | |
590232a7 ACM |
1136 | if (rc != 0) { |
1137 | printk(llc_proc_err_msg); | |
1da177e4 | 1138 | goto out_unregister_llc_proto; |
590232a7 ACM |
1139 | } |
1140 | rc = llc_sysctl_init(); | |
1141 | if (rc) { | |
1142 | printk(llc_sysctl_err_msg); | |
1143 | goto out_proc; | |
1144 | } | |
1145 | rc = sock_register(&llc_ui_family_ops); | |
1146 | if (rc) { | |
1147 | printk(llc_sock_err_msg); | |
1148 | goto out_sysctl; | |
1149 | } | |
1da177e4 LT |
1150 | llc_add_pack(LLC_DEST_SAP, llc_sap_handler); |
1151 | llc_add_pack(LLC_DEST_CONN, llc_conn_handler); | |
1152 | out: | |
1153 | return rc; | |
590232a7 ACM |
1154 | out_sysctl: |
1155 | llc_sysctl_exit(); | |
1156 | out_proc: | |
1157 | llc_proc_exit(); | |
1da177e4 LT |
1158 | out_unregister_llc_proto: |
1159 | proto_unregister(&llc_proto); | |
1160 | goto out; | |
1161 | } | |
1162 | ||
1163 | static void __exit llc2_exit(void) | |
1164 | { | |
1165 | llc_station_exit(); | |
1166 | llc_remove_pack(LLC_DEST_SAP); | |
1167 | llc_remove_pack(LLC_DEST_CONN); | |
1168 | sock_unregister(PF_LLC); | |
1169 | llc_proc_exit(); | |
590232a7 | 1170 | llc_sysctl_exit(); |
1da177e4 LT |
1171 | proto_unregister(&llc_proto); |
1172 | } | |
1173 | ||
1174 | module_init(llc2_init); | |
1175 | module_exit(llc2_exit); | |
1176 | ||
1177 | MODULE_LICENSE("GPL"); | |
1178 | MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003"); | |
1179 | MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support"); | |
1180 | MODULE_ALIAS_NETPROTO(PF_LLC); |