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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> | |
26 | #include <linux/tcp.h> | |
27 | #include <linux/rtnetlink.h> | |
28 | #include <linux/init.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 | ||
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 | ||
40 | static int llc_ui_wait_for_conn(struct sock *sk, int timeout); | |
41 | static int llc_ui_wait_for_disc(struct sock *sk, int timeout); | |
42 | static int llc_ui_wait_for_data(struct sock *sk, int timeout); | |
43 | static int llc_ui_wait_for_busy_core(struct sock *sk, int timeout); | |
44 | ||
45 | #if 0 | |
46 | #define dprintk(args...) printk(KERN_DEBUG args) | |
47 | #else | |
48 | #define dprintk(args...) | |
49 | #endif | |
50 | ||
51 | /** | |
52 | * llc_ui_next_link_no - return the next unused link number for a sap | |
53 | * @sap: Address of sap to get link number from. | |
54 | * | |
55 | * Return the next unused link number for a given sap. | |
56 | */ | |
57 | static __inline__ u16 llc_ui_next_link_no(int sap) | |
58 | { | |
59 | return llc_ui_sap_link_no_max[sap]++; | |
60 | } | |
61 | ||
62 | /** | |
63 | * llc_proto_type - return eth protocol for ARP header type | |
64 | * @arphrd: ARP header type. | |
65 | * | |
66 | * Given an ARP header type return the corresponding ethernet protocol. | |
67 | */ | |
68 | static __inline__ u16 llc_proto_type(u16 arphrd) | |
69 | { | |
70 | return arphrd == ARPHRD_IEEE802_TR ? | |
71 | htons(ETH_P_TR_802_2) : htons(ETH_P_802_2); | |
72 | } | |
73 | ||
74 | /** | |
75 | * llc_ui_addr_null - determines if a address structure is null | |
76 | * @addr: Address to test if null. | |
77 | */ | |
78 | static __inline__ u8 llc_ui_addr_null(struct sockaddr_llc *addr) | |
79 | { | |
80 | return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr)); | |
81 | } | |
82 | ||
83 | /** | |
84 | * llc_ui_header_len - return length of llc header based on operation | |
85 | * @sk: Socket which contains a valid llc socket type. | |
86 | * @addr: Complete sockaddr_llc structure received from the user. | |
87 | * | |
88 | * Provide the length of the llc header depending on what kind of | |
89 | * operation the user would like to perform and the type of socket. | |
90 | * Returns the correct llc header length. | |
91 | */ | |
92 | static __inline__ u8 llc_ui_header_len(struct sock *sk, | |
93 | struct sockaddr_llc *addr) | |
94 | { | |
95 | u8 rc = LLC_PDU_LEN_U; | |
96 | ||
97 | if (addr->sllc_test || addr->sllc_xid) | |
98 | rc = LLC_PDU_LEN_U; | |
99 | else if (sk->sk_type == SOCK_STREAM) | |
100 | rc = LLC_PDU_LEN_I; | |
101 | return rc; | |
102 | } | |
103 | ||
104 | /** | |
105 | * llc_ui_send_data - send data via reliable llc2 connection | |
106 | * @sk: Connection the socket is using. | |
107 | * @skb: Data the user wishes to send. | |
108 | * @addr: Source and destination fields provided by the user. | |
109 | * @noblock: can we block waiting for data? | |
110 | * | |
111 | * Send data via reliable llc2 connection. | |
112 | * Returns 0 upon success, non-zero if action did not succeed. | |
113 | */ | |
114 | static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock) | |
115 | { | |
116 | struct llc_sock* llc = llc_sk(sk); | |
117 | int rc = 0; | |
118 | ||
119 | if (llc_data_accept_state(llc->state) || llc->p_flag) { | |
120 | int timeout = sock_sndtimeo(sk, noblock); | |
121 | ||
122 | rc = llc_ui_wait_for_busy_core(sk, timeout); | |
123 | } | |
124 | if (!rc) | |
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 = { | |
139 | .name = "DDP", | |
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 | ||
158 | if (sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM) { | |
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 | ||
180 | if (!sk) | |
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); | |
189 | if (!sock_flag(sk, SOCK_ZAPPED)) | |
190 | llc_sap_remove_socket(llc->sap, sk); | |
191 | release_sock(sk); | |
192 | if (llc->sap && hlist_empty(&llc->sap->sk_list.list)) { | |
193 | llc_release_sockets(llc->sap); | |
194 | llc_sap_close(llc->sap); | |
195 | } | |
196 | if (llc->dev) | |
197 | dev_put(llc->dev); | |
198 | sock_put(sk); | |
199 | llc_sk_free(sk); | |
200 | out: | |
201 | return 0; | |
202 | } | |
203 | ||
204 | /** | |
205 | * llc_ui_autoport - provide dynamically allocate SAP number | |
206 | * | |
207 | * Provide the caller with a dynamically allocated SAP number according | |
208 | * to the rules that are set in this function. Returns: 0, upon failure, | |
209 | * SAP number otherwise. | |
210 | */ | |
211 | static int llc_ui_autoport(void) | |
212 | { | |
213 | struct llc_sap *sap; | |
214 | int i, tries = 0; | |
215 | ||
216 | while (tries < LLC_SAP_DYN_TRIES) { | |
217 | for (i = llc_ui_sap_last_autoport; | |
218 | i < LLC_SAP_DYN_STOP; i += 2) { | |
219 | sap = llc_sap_find(i); | |
220 | if (!sap) { | |
221 | llc_ui_sap_last_autoport = i + 2; | |
222 | goto out; | |
223 | } | |
224 | } | |
225 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; | |
226 | tries++; | |
227 | } | |
228 | i = 0; | |
229 | out: | |
230 | return i; | |
231 | } | |
232 | ||
233 | /** | |
234 | * llc_ui_autobind - Bind a socket to a specific address. | |
235 | * @sk: Socket to bind an address to. | |
236 | * @addr: Address the user wants the socket bound to. | |
237 | * | |
238 | * Bind a socket to a specific address. For llc a user is able to bind to | |
239 | * a specific sap only or mac + sap. If the user only specifies a sap and | |
240 | * a null dmac (all zeros) the user is attempting to bind to an entire | |
241 | * sap. This will stop anyone else on the local system from using that | |
242 | * sap. If someone else has a mac + sap open the bind to null + sap will | |
243 | * fail. | |
244 | * If the user desires to bind to a specific mac + sap, it is possible to | |
245 | * have multiple sap connections via multiple macs. | |
246 | * Bind and autobind for that matter must enforce the correct sap usage | |
247 | * otherwise all hell will break loose. | |
248 | * Returns: 0 upon success, negative otherwise. | |
249 | */ | |
250 | static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr) | |
251 | { | |
252 | struct sock *sk = sock->sk; | |
253 | struct llc_sock *llc = llc_sk(sk); | |
254 | struct llc_sap *sap; | |
255 | int rc = -EINVAL; | |
256 | ||
257 | if (!sock_flag(sk, SOCK_ZAPPED)) | |
258 | goto out; | |
259 | rc = -ENODEV; | |
260 | llc->dev = dev_getfirstbyhwtype(addr->sllc_arphrd); | |
261 | if (!llc->dev) | |
262 | goto out; | |
263 | rc = -EUSERS; | |
264 | llc->laddr.lsap = llc_ui_autoport(); | |
265 | if (!llc->laddr.lsap) | |
266 | goto out; | |
267 | rc = -EBUSY; /* some other network layer is using the sap */ | |
268 | sap = llc_sap_open(llc->laddr.lsap, NULL); | |
269 | if (!sap) | |
270 | goto out; | |
271 | memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN); | |
272 | memcpy(&llc->addr, addr, sizeof(llc->addr)); | |
273 | /* assign new connection to its SAP */ | |
274 | llc_sap_add_socket(sap, sk); | |
275 | sock_reset_flag(sk, SOCK_ZAPPED); | |
276 | rc = 0; | |
277 | out: | |
278 | return rc; | |
279 | } | |
280 | ||
281 | /** | |
282 | * llc_ui_bind - bind a socket to a specific address. | |
283 | * @sock: Socket to bind an address to. | |
284 | * @uaddr: Address the user wants the socket bound to. | |
285 | * @addrlen: Length of the uaddr structure. | |
286 | * | |
287 | * Bind a socket to a specific address. For llc a user is able to bind to | |
288 | * a specific sap only or mac + sap. If the user only specifies a sap and | |
289 | * a null dmac (all zeros) the user is attempting to bind to an entire | |
290 | * sap. This will stop anyone else on the local system from using that | |
291 | * sap. If someone else has a mac + sap open the bind to null + sap will | |
292 | * fail. | |
293 | * If the user desires to bind to a specific mac + sap, it is possible to | |
294 | * have multiple sap connections via multiple macs. | |
295 | * Bind and autobind for that matter must enforce the correct sap usage | |
296 | * otherwise all hell will break loose. | |
297 | * Returns: 0 upon success, negative otherwise. | |
298 | */ | |
299 | static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen) | |
300 | { | |
301 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; | |
302 | struct sock *sk = sock->sk; | |
303 | struct llc_sock *llc = llc_sk(sk); | |
304 | struct llc_sap *sap; | |
305 | int rc = -EINVAL; | |
306 | ||
307 | dprintk("%s: binding %02X\n", __FUNCTION__, addr->sllc_sap); | |
308 | if (!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)) | |
309 | goto out; | |
310 | rc = -EAFNOSUPPORT; | |
311 | if (addr->sllc_family != AF_LLC) | |
312 | goto out; | |
313 | if (!addr->sllc_sap) { | |
314 | rc = -EUSERS; | |
315 | addr->sllc_sap = llc_ui_autoport(); | |
316 | if (!addr->sllc_sap) | |
317 | goto out; | |
318 | } | |
319 | sap = llc_sap_find(addr->sllc_sap); | |
320 | if (!sap) { | |
321 | sap = llc_sap_open(addr->sllc_sap, NULL); | |
322 | rc = -EBUSY; /* some other network layer is using the sap */ | |
323 | if (!sap) | |
324 | goto out; | |
325 | } else { | |
326 | struct llc_addr laddr, daddr; | |
327 | struct sock *ask; | |
328 | ||
329 | memset(&laddr, 0, sizeof(laddr)); | |
330 | memset(&daddr, 0, sizeof(daddr)); | |
331 | /* | |
332 | * FIXME: check if the the address is multicast, | |
333 | * only SOCK_DGRAM can do this. | |
334 | */ | |
335 | memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
336 | laddr.lsap = addr->sllc_sap; | |
337 | rc = -EADDRINUSE; /* mac + sap clash. */ | |
338 | ask = llc_lookup_established(sap, &daddr, &laddr); | |
339 | if (ask) { | |
340 | sock_put(ask); | |
341 | goto out; | |
342 | } | |
343 | } | |
344 | llc->laddr.lsap = addr->sllc_sap; | |
345 | memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
346 | memcpy(&llc->addr, addr, sizeof(llc->addr)); | |
347 | /* assign new connection to its SAP */ | |
348 | llc_sap_add_socket(sap, sk); | |
349 | sock_reset_flag(sk, SOCK_ZAPPED); | |
350 | rc = 0; | |
351 | out: | |
352 | return rc; | |
353 | } | |
354 | ||
355 | /** | |
356 | * llc_ui_shutdown - shutdown a connect llc2 socket. | |
357 | * @sock: Socket to shutdown. | |
358 | * @how: What part of the socket to shutdown. | |
359 | * | |
360 | * Shutdown a connected llc2 socket. Currently this function only supports | |
361 | * shutting down both sends and receives (2), we could probably make this | |
362 | * function such that a user can shutdown only half the connection but not | |
363 | * right now. | |
364 | * Returns: 0 upon success, negative otherwise. | |
365 | */ | |
366 | static int llc_ui_shutdown(struct socket *sock, int how) | |
367 | { | |
368 | struct sock *sk = sock->sk; | |
369 | int rc = -ENOTCONN; | |
370 | ||
371 | lock_sock(sk); | |
372 | if (sk->sk_state != TCP_ESTABLISHED) | |
373 | goto out; | |
374 | rc = -EINVAL; | |
375 | if (how != 2) | |
376 | goto out; | |
377 | rc = llc_send_disc(sk); | |
378 | if (!rc) | |
379 | rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); | |
380 | /* Wake up anyone sleeping in poll */ | |
381 | sk->sk_state_change(sk); | |
382 | out: | |
383 | release_sock(sk); | |
384 | return rc; | |
385 | } | |
386 | ||
387 | /** | |
388 | * llc_ui_connect - Connect to a remote llc2 mac + sap. | |
389 | * @sock: Socket which will be connected to the remote destination. | |
390 | * @uaddr: Remote and possibly the local address of the new connection. | |
391 | * @addrlen: Size of uaddr structure. | |
392 | * @flags: Operational flags specified by the user. | |
393 | * | |
394 | * Connect to a remote llc2 mac + sap. The caller must specify the | |
395 | * destination mac and address to connect to. If the user hasn't previously | |
396 | * called bind(2) with a smac the address of the first interface of the | |
397 | * specified arp type will be used. | |
398 | * This function will autobind if user did not previously call bind. | |
399 | * Returns: 0 upon success, negative otherwise. | |
400 | */ | |
401 | static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr, | |
402 | int addrlen, int flags) | |
403 | { | |
404 | struct sock *sk = sock->sk; | |
405 | struct llc_sock *llc = llc_sk(sk); | |
406 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; | |
407 | struct net_device *dev; | |
408 | int rc = -EINVAL; | |
409 | ||
410 | lock_sock(sk); | |
411 | if (addrlen != sizeof(*addr)) | |
412 | goto out; | |
413 | rc = -EAFNOSUPPORT; | |
414 | if (addr->sllc_family != AF_LLC) | |
415 | goto out; | |
416 | /* bind connection to sap if user hasn't done it. */ | |
417 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
418 | /* bind to sap with null dev, exclusive */ | |
419 | rc = llc_ui_autobind(sock, addr); | |
420 | if (rc) | |
421 | goto out; | |
422 | llc->daddr.lsap = addr->sllc_sap; | |
423 | memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
424 | } | |
425 | dev = llc->dev; | |
426 | if (sk->sk_type != SOCK_STREAM) | |
427 | goto out; | |
428 | rc = -EALREADY; | |
429 | if (sock->state == SS_CONNECTING) | |
430 | goto out; | |
431 | sock->state = SS_CONNECTING; | |
432 | sk->sk_state = TCP_SYN_SENT; | |
433 | llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap); | |
434 | rc = llc_establish_connection(sk, dev->dev_addr, | |
435 | addr->sllc_mac, addr->sllc_sap); | |
436 | if (rc) { | |
437 | dprintk("%s: llc_ui_send_conn failed :-(\n", __FUNCTION__); | |
438 | sock->state = SS_UNCONNECTED; | |
439 | sk->sk_state = TCP_CLOSE; | |
440 | goto out; | |
441 | } | |
442 | rc = llc_ui_wait_for_conn(sk, sk->sk_rcvtimeo); | |
443 | if (rc) | |
444 | dprintk("%s: llc_ui_wait_for_conn failed=%d\n", __FUNCTION__, rc); | |
445 | out: | |
446 | release_sock(sk); | |
447 | return rc; | |
448 | } | |
449 | ||
450 | /** | |
451 | * llc_ui_listen - allow a normal socket to accept incoming connections | |
452 | * @sock: Socket to allow incoming connections on. | |
453 | * @backlog: Number of connections to queue. | |
454 | * | |
455 | * Allow a normal socket to accept incoming connections. | |
456 | * Returns 0 upon success, negative otherwise. | |
457 | */ | |
458 | static int llc_ui_listen(struct socket *sock, int backlog) | |
459 | { | |
460 | struct sock *sk = sock->sk; | |
461 | int rc = -EINVAL; | |
462 | ||
463 | lock_sock(sk); | |
464 | if (sock->state != SS_UNCONNECTED) | |
465 | goto out; | |
466 | rc = -EOPNOTSUPP; | |
467 | if (sk->sk_type != SOCK_STREAM) | |
468 | goto out; | |
469 | rc = -EAGAIN; | |
470 | if (sock_flag(sk, SOCK_ZAPPED)) | |
471 | goto out; | |
472 | rc = 0; | |
473 | if (!(unsigned)backlog) /* BSDism */ | |
474 | backlog = 1; | |
475 | sk->sk_max_ack_backlog = backlog; | |
476 | if (sk->sk_state != TCP_LISTEN) { | |
477 | sk->sk_ack_backlog = 0; | |
478 | sk->sk_state = TCP_LISTEN; | |
479 | } | |
480 | sk->sk_socket->flags |= __SO_ACCEPTCON; | |
481 | out: | |
482 | release_sock(sk); | |
483 | return rc; | |
484 | } | |
485 | ||
486 | static int llc_ui_wait_for_disc(struct sock *sk, int timeout) | |
487 | { | |
488 | DECLARE_WAITQUEUE(wait, current); | |
489 | int rc; | |
490 | ||
491 | add_wait_queue_exclusive(sk->sk_sleep, &wait); | |
492 | for (;;) { | |
493 | __set_current_state(TASK_INTERRUPTIBLE); | |
494 | rc = 0; | |
495 | if (sk->sk_state != TCP_CLOSE) { | |
496 | release_sock(sk); | |
497 | timeout = schedule_timeout(timeout); | |
498 | lock_sock(sk); | |
499 | } else | |
500 | break; | |
501 | rc = -ERESTARTSYS; | |
502 | if (signal_pending(current)) | |
503 | break; | |
504 | rc = -EAGAIN; | |
505 | if (!timeout) | |
506 | break; | |
507 | } | |
508 | __set_current_state(TASK_RUNNING); | |
509 | remove_wait_queue(sk->sk_sleep, &wait); | |
510 | return rc; | |
511 | } | |
512 | ||
513 | static int llc_ui_wait_for_conn(struct sock *sk, int timeout) | |
514 | { | |
515 | DECLARE_WAITQUEUE(wait, current); | |
516 | int rc; | |
517 | ||
518 | add_wait_queue_exclusive(sk->sk_sleep, &wait); | |
519 | for (;;) { | |
520 | __set_current_state(TASK_INTERRUPTIBLE); | |
521 | rc = -EAGAIN; | |
522 | if (sk->sk_state == TCP_CLOSE) | |
523 | break; | |
524 | rc = 0; | |
525 | if (sk->sk_state != TCP_ESTABLISHED) { | |
526 | release_sock(sk); | |
527 | timeout = schedule_timeout(timeout); | |
528 | lock_sock(sk); | |
529 | } else | |
530 | break; | |
531 | rc = -ERESTARTSYS; | |
532 | if (signal_pending(current)) | |
533 | break; | |
534 | rc = -EAGAIN; | |
535 | if (!timeout) | |
536 | break; | |
537 | } | |
538 | __set_current_state(TASK_RUNNING); | |
539 | remove_wait_queue(sk->sk_sleep, &wait); | |
540 | return rc; | |
541 | } | |
542 | ||
543 | static int llc_ui_wait_for_data(struct sock *sk, int timeout) | |
544 | { | |
545 | DECLARE_WAITQUEUE(wait, current); | |
546 | int rc = 0; | |
547 | ||
548 | add_wait_queue_exclusive(sk->sk_sleep, &wait); | |
549 | for (;;) { | |
550 | __set_current_state(TASK_INTERRUPTIBLE); | |
551 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
552 | break; | |
553 | /* | |
554 | * Well, if we have backlog, try to process it now. | |
555 | */ | |
556 | if (sk->sk_backlog.tail) { | |
557 | release_sock(sk); | |
558 | lock_sock(sk); | |
559 | } | |
560 | rc = 0; | |
561 | if (skb_queue_empty(&sk->sk_receive_queue)) { | |
562 | release_sock(sk); | |
563 | timeout = schedule_timeout(timeout); | |
564 | lock_sock(sk); | |
565 | } else | |
566 | break; | |
567 | rc = -ERESTARTSYS; | |
568 | if (signal_pending(current)) | |
569 | break; | |
570 | rc = -EAGAIN; | |
571 | if (!timeout) | |
572 | break; | |
573 | } | |
574 | __set_current_state(TASK_RUNNING); | |
575 | remove_wait_queue(sk->sk_sleep, &wait); | |
576 | return rc; | |
577 | } | |
578 | ||
579 | static int llc_ui_wait_for_busy_core(struct sock *sk, int timeout) | |
580 | { | |
581 | DECLARE_WAITQUEUE(wait, current); | |
582 | struct llc_sock *llc = llc_sk(sk); | |
583 | int rc; | |
584 | ||
585 | add_wait_queue_exclusive(sk->sk_sleep, &wait); | |
586 | for (;;) { | |
587 | dprintk("%s: looping...\n", __FUNCTION__); | |
588 | __set_current_state(TASK_INTERRUPTIBLE); | |
589 | rc = -ENOTCONN; | |
590 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
591 | break; | |
592 | rc = 0; | |
593 | if (llc_data_accept_state(llc->state) || llc->p_flag) { | |
594 | release_sock(sk); | |
595 | timeout = schedule_timeout(timeout); | |
596 | lock_sock(sk); | |
597 | } else | |
598 | break; | |
599 | rc = -ERESTARTSYS; | |
600 | if (signal_pending(current)) | |
601 | break; | |
602 | rc = -EAGAIN; | |
603 | if (!timeout) | |
604 | break; | |
605 | } | |
606 | __set_current_state(TASK_RUNNING); | |
607 | remove_wait_queue(sk->sk_sleep, &wait); | |
608 | return rc; | |
609 | } | |
610 | ||
611 | /** | |
612 | * llc_ui_accept - accept a new incoming connection. | |
613 | * @sock: Socket which connections arrive on. | |
614 | * @newsock: Socket to move incoming connection to. | |
615 | * @flags: User specified operational flags. | |
616 | * | |
617 | * Accept a new incoming connection. | |
618 | * Returns 0 upon success, negative otherwise. | |
619 | */ | |
620 | static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags) | |
621 | { | |
622 | struct sock *sk = sock->sk, *newsk; | |
623 | struct llc_sock *llc, *newllc; | |
624 | struct sk_buff *skb; | |
625 | int rc = -EOPNOTSUPP; | |
626 | ||
627 | dprintk("%s: accepting on %02X\n", __FUNCTION__, | |
628 | llc_sk(sk)->laddr.lsap); | |
629 | lock_sock(sk); | |
630 | if (sk->sk_type != SOCK_STREAM) | |
631 | goto out; | |
632 | rc = -EINVAL; | |
633 | if (sock->state != SS_UNCONNECTED || sk->sk_state != TCP_LISTEN) | |
634 | goto out; | |
635 | /* wait for a connection to arrive. */ | |
636 | rc = llc_ui_wait_for_data(sk, sk->sk_rcvtimeo); | |
637 | if (rc) | |
638 | goto out; | |
639 | dprintk("%s: got a new connection on %02X\n", __FUNCTION__, | |
640 | llc_sk(sk)->laddr.lsap); | |
641 | skb = skb_dequeue(&sk->sk_receive_queue); | |
642 | rc = -EINVAL; | |
643 | if (!skb->sk) | |
644 | goto frees; | |
645 | rc = 0; | |
646 | newsk = skb->sk; | |
647 | /* attach connection to a new socket. */ | |
648 | llc_ui_sk_init(newsock, newsk); | |
649 | sock_reset_flag(newsk, SOCK_ZAPPED); | |
650 | newsk->sk_state = TCP_ESTABLISHED; | |
651 | newsock->state = SS_CONNECTED; | |
652 | llc = llc_sk(sk); | |
653 | newllc = llc_sk(newsk); | |
654 | memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr)); | |
655 | newllc->link = llc_ui_next_link_no(newllc->laddr.lsap); | |
656 | ||
657 | /* put original socket back into a clean listen state. */ | |
658 | sk->sk_state = TCP_LISTEN; | |
659 | sk->sk_ack_backlog--; | |
660 | skb->sk = NULL; | |
661 | dprintk("%s: ok success on %02X, client on %02X\n", __FUNCTION__, | |
662 | llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap); | |
663 | frees: | |
664 | kfree_skb(skb); | |
665 | out: | |
666 | release_sock(sk); | |
667 | return rc; | |
668 | } | |
669 | ||
670 | /** | |
671 | * llc_ui_recvmsg - copy received data to the socket user. | |
672 | * @sock: Socket to copy data from. | |
673 | * @msg: Various user space related information. | |
674 | * @size: Size of user buffer. | |
675 | * @flags: User specified flags. | |
676 | * | |
677 | * Copy received data to the socket user. | |
678 | * Returns non-negative upon success, negative otherwise. | |
679 | */ | |
680 | static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock, | |
681 | struct msghdr *msg, size_t size, int flags) | |
682 | { | |
683 | struct sock *sk = sock->sk; | |
684 | struct sockaddr_llc *uaddr = (struct sockaddr_llc *)msg->msg_name; | |
685 | struct sk_buff *skb; | |
686 | size_t copied = 0; | |
687 | int rc = -ENOMEM, timeout; | |
688 | int noblock = flags & MSG_DONTWAIT; | |
689 | ||
690 | dprintk("%s: receiving in %02X from %02X\n", __FUNCTION__, | |
691 | llc_sk(sk)->laddr.lsap, llc_sk(sk)->daddr.lsap); | |
692 | lock_sock(sk); | |
693 | timeout = sock_rcvtimeo(sk, noblock); | |
694 | rc = llc_ui_wait_for_data(sk, timeout); | |
695 | if (rc) { | |
696 | dprintk("%s: llc_ui_wait_for_data failed recv " | |
697 | "in %02X from %02X\n", __FUNCTION__, | |
698 | llc_sk(sk)->laddr.lsap, llc_sk(sk)->daddr.lsap); | |
699 | goto out; | |
700 | } | |
701 | skb = skb_dequeue(&sk->sk_receive_queue); | |
702 | if (!skb) /* shutdown */ | |
703 | goto out; | |
704 | copied = skb->len; | |
705 | if (copied > size) | |
706 | copied = size; | |
707 | rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
708 | if (rc) | |
709 | goto dgram_free; | |
710 | if (skb->len > copied) { | |
711 | skb_pull(skb, copied); | |
712 | skb_queue_head(&sk->sk_receive_queue, skb); | |
713 | } | |
714 | if (uaddr) | |
715 | memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr)); | |
716 | msg->msg_namelen = sizeof(*uaddr); | |
717 | if (!skb->list) { | |
718 | dgram_free: | |
719 | kfree_skb(skb); | |
720 | } | |
721 | out: | |
722 | release_sock(sk); | |
723 | return rc ? : copied; | |
724 | } | |
725 | ||
726 | /** | |
727 | * llc_ui_sendmsg - Transmit data provided by the socket user. | |
728 | * @sock: Socket to transmit data from. | |
729 | * @msg: Various user related information. | |
730 | * @len: Length of data to transmit. | |
731 | * | |
732 | * Transmit data provided by the socket user. | |
733 | * Returns non-negative upon success, negative otherwise. | |
734 | */ | |
735 | static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock, | |
736 | struct msghdr *msg, size_t len) | |
737 | { | |
738 | struct sock *sk = sock->sk; | |
739 | struct llc_sock *llc = llc_sk(sk); | |
740 | struct sockaddr_llc *addr = (struct sockaddr_llc *)msg->msg_name; | |
741 | int flags = msg->msg_flags; | |
742 | int noblock = flags & MSG_DONTWAIT; | |
743 | struct net_device *dev; | |
744 | struct sk_buff *skb; | |
745 | size_t size = 0; | |
746 | int rc = -EINVAL, copied = 0, hdrlen; | |
747 | ||
748 | dprintk("%s: sending from %02X to %02X\n", __FUNCTION__, | |
749 | llc->laddr.lsap, llc->daddr.lsap); | |
750 | lock_sock(sk); | |
751 | if (addr) { | |
752 | if (msg->msg_namelen < sizeof(*addr)) | |
753 | goto release; | |
754 | } else { | |
755 | if (llc_ui_addr_null(&llc->addr)) | |
756 | goto release; | |
757 | addr = &llc->addr; | |
758 | } | |
759 | /* must bind connection to sap if user hasn't done it. */ | |
760 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
761 | /* bind to sap with null dev, exclusive. */ | |
762 | rc = llc_ui_autobind(sock, addr); | |
763 | if (rc) | |
764 | goto release; | |
765 | } | |
766 | dev = llc->dev; | |
767 | hdrlen = dev->hard_header_len + llc_ui_header_len(sk, addr); | |
768 | size = hdrlen + len; | |
769 | if (size > dev->mtu) | |
770 | size = dev->mtu; | |
771 | copied = size - hdrlen; | |
772 | release_sock(sk); | |
773 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
774 | lock_sock(sk); | |
775 | if (!skb) | |
776 | goto release; | |
777 | skb->sk = sk; | |
778 | skb->dev = dev; | |
779 | skb->protocol = llc_proto_type(addr->sllc_arphrd); | |
780 | skb_reserve(skb, hdrlen); | |
781 | rc = memcpy_fromiovec(skb_put(skb, copied), msg->msg_iov, copied); | |
782 | if (rc) | |
783 | goto out; | |
784 | if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) { | |
785 | llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac, | |
786 | addr->sllc_sap); | |
787 | goto out; | |
788 | } | |
789 | if (addr->sllc_test) { | |
790 | llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac, | |
791 | addr->sllc_sap); | |
792 | goto out; | |
793 | } | |
794 | if (addr->sllc_xid) { | |
795 | llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac, | |
796 | addr->sllc_sap); | |
797 | goto out; | |
798 | } | |
799 | rc = -ENOPROTOOPT; | |
800 | if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua)) | |
801 | goto out; | |
802 | rc = llc_ui_send_data(sk, skb, noblock); | |
803 | if (rc) | |
804 | dprintk("%s: llc_ui_send_data failed: %d\n", __FUNCTION__, rc); | |
805 | out: | |
806 | if (rc) | |
807 | kfree_skb(skb); | |
808 | release: | |
809 | if (rc) | |
810 | dprintk("%s: failed sending from %02X to %02X: %d\n", | |
811 | __FUNCTION__, llc->laddr.lsap, llc->daddr.lsap, rc); | |
812 | release_sock(sk); | |
813 | return rc ? : copied; | |
814 | } | |
815 | ||
816 | /** | |
817 | * llc_ui_getname - return the address info of a socket | |
818 | * @sock: Socket to get address of. | |
819 | * @uaddr: Address structure to return information. | |
820 | * @uaddrlen: Length of address structure. | |
821 | * @peer: Does user want local or remote address information. | |
822 | * | |
823 | * Return the address information of a socket. | |
824 | */ | |
825 | static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr, | |
826 | int *uaddrlen, int peer) | |
827 | { | |
828 | struct sockaddr_llc sllc; | |
829 | struct sock *sk = sock->sk; | |
830 | struct llc_sock *llc = llc_sk(sk); | |
831 | int rc = 0; | |
832 | ||
833 | lock_sock(sk); | |
834 | if (sock_flag(sk, SOCK_ZAPPED)) | |
835 | goto out; | |
836 | *uaddrlen = sizeof(sllc); | |
837 | memset(uaddr, 0, *uaddrlen); | |
838 | if (peer) { | |
839 | rc = -ENOTCONN; | |
840 | if (sk->sk_state != TCP_ESTABLISHED) | |
841 | goto out; | |
842 | if(llc->dev) | |
843 | sllc.sllc_arphrd = llc->dev->type; | |
844 | sllc.sllc_sap = llc->daddr.lsap; | |
845 | memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN); | |
846 | } else { | |
847 | rc = -EINVAL; | |
848 | if (!llc->sap) | |
849 | goto out; | |
850 | sllc.sllc_sap = llc->sap->laddr.lsap; | |
851 | ||
852 | if (llc->dev) { | |
853 | sllc.sllc_arphrd = llc->dev->type; | |
854 | memcpy(&sllc.sllc_mac, &llc->dev->dev_addr, | |
855 | IFHWADDRLEN); | |
856 | } | |
857 | } | |
858 | rc = 0; | |
859 | sllc.sllc_family = AF_LLC; | |
860 | memcpy(uaddr, &sllc, sizeof(sllc)); | |
861 | out: | |
862 | release_sock(sk); | |
863 | return rc; | |
864 | } | |
865 | ||
866 | /** | |
867 | * llc_ui_ioctl - io controls for PF_LLC | |
868 | * @sock: Socket to get/set info | |
869 | * @cmd: command | |
870 | * @arg: optional argument for cmd | |
871 | * | |
872 | * get/set info on llc sockets | |
873 | */ | |
874 | static int llc_ui_ioctl(struct socket *sock, unsigned int cmd, | |
875 | unsigned long arg) | |
876 | { | |
877 | return dev_ioctl(cmd, (void __user *)arg); | |
878 | } | |
879 | ||
880 | /** | |
881 | * llc_ui_setsockopt - set various connection specific parameters. | |
882 | * @sock: Socket to set options on. | |
883 | * @level: Socket level user is requesting operations on. | |
884 | * @optname: Operation name. | |
885 | * @optval User provided operation data. | |
886 | * @optlen: Length of optval. | |
887 | * | |
888 | * Set various connection specific parameters. | |
889 | */ | |
890 | static int llc_ui_setsockopt(struct socket *sock, int level, int optname, | |
891 | char __user *optval, int optlen) | |
892 | { | |
893 | struct sock *sk = sock->sk; | |
894 | struct llc_sock *llc = llc_sk(sk); | |
895 | int rc = -EINVAL, opt; | |
896 | ||
897 | lock_sock(sk); | |
898 | if (level != SOL_LLC || optlen != sizeof(int)) | |
899 | goto out; | |
900 | rc = get_user(opt, (int __user *)optval); | |
901 | if (rc) | |
902 | goto out; | |
903 | rc = -EINVAL; | |
904 | switch (optname) { | |
905 | case LLC_OPT_RETRY: | |
906 | if (opt > LLC_OPT_MAX_RETRY) | |
907 | goto out; | |
908 | llc->n2 = opt; | |
909 | break; | |
910 | case LLC_OPT_SIZE: | |
911 | if (opt > LLC_OPT_MAX_SIZE) | |
912 | goto out; | |
913 | llc->n1 = opt; | |
914 | break; | |
915 | case LLC_OPT_ACK_TMR_EXP: | |
916 | if (opt > LLC_OPT_MAX_ACK_TMR_EXP) | |
917 | goto out; | |
918 | llc->ack_timer.expire = opt; | |
919 | break; | |
920 | case LLC_OPT_P_TMR_EXP: | |
921 | if (opt > LLC_OPT_MAX_P_TMR_EXP) | |
922 | goto out; | |
923 | llc->pf_cycle_timer.expire = opt; | |
924 | break; | |
925 | case LLC_OPT_REJ_TMR_EXP: | |
926 | if (opt > LLC_OPT_MAX_REJ_TMR_EXP) | |
927 | goto out; | |
928 | llc->rej_sent_timer.expire = opt; | |
929 | break; | |
930 | case LLC_OPT_BUSY_TMR_EXP: | |
931 | if (opt > LLC_OPT_MAX_BUSY_TMR_EXP) | |
932 | goto out; | |
933 | llc->busy_state_timer.expire = opt; | |
934 | break; | |
935 | case LLC_OPT_TX_WIN: | |
936 | if (opt > LLC_OPT_MAX_WIN) | |
937 | goto out; | |
938 | llc->k = opt; | |
939 | break; | |
940 | case LLC_OPT_RX_WIN: | |
941 | if (opt > LLC_OPT_MAX_WIN) | |
942 | goto out; | |
943 | llc->rw = opt; | |
944 | break; | |
945 | default: | |
946 | rc = -ENOPROTOOPT; | |
947 | goto out; | |
948 | } | |
949 | rc = 0; | |
950 | out: | |
951 | release_sock(sk); | |
952 | return rc; | |
953 | } | |
954 | ||
955 | /** | |
956 | * llc_ui_getsockopt - get connection specific socket info | |
957 | * @sock: Socket to get information from. | |
958 | * @level: Socket level user is requesting operations on. | |
959 | * @optname: Operation name. | |
960 | * @optval: Variable to return operation data in. | |
961 | * @optlen: Length of optval. | |
962 | * | |
963 | * Get connection specific socket information. | |
964 | */ | |
965 | static int llc_ui_getsockopt(struct socket *sock, int level, int optname, | |
966 | char __user *optval, int __user *optlen) | |
967 | { | |
968 | struct sock *sk = sock->sk; | |
969 | struct llc_sock *llc = llc_sk(sk); | |
970 | int val = 0, len = 0, rc = -EINVAL; | |
971 | ||
972 | lock_sock(sk); | |
973 | if (level != SOL_LLC) | |
974 | goto out; | |
975 | rc = get_user(len, optlen); | |
976 | if (rc) | |
977 | goto out; | |
978 | rc = -EINVAL; | |
979 | if (len != sizeof(int)) | |
980 | goto out; | |
981 | switch (optname) { | |
982 | case LLC_OPT_RETRY: | |
983 | val = llc->n2; break; | |
984 | case LLC_OPT_SIZE: | |
985 | val = llc->n1; break; | |
986 | case LLC_OPT_ACK_TMR_EXP: | |
987 | val = llc->ack_timer.expire; break; | |
988 | case LLC_OPT_P_TMR_EXP: | |
989 | val = llc->pf_cycle_timer.expire; break; | |
990 | case LLC_OPT_REJ_TMR_EXP: | |
991 | val = llc->rej_sent_timer.expire; break; | |
992 | case LLC_OPT_BUSY_TMR_EXP: | |
993 | val = llc->busy_state_timer.expire; break; | |
994 | case LLC_OPT_TX_WIN: | |
995 | val = llc->k; break; | |
996 | case LLC_OPT_RX_WIN: | |
997 | val = llc->rw; break; | |
998 | default: | |
999 | rc = -ENOPROTOOPT; | |
1000 | goto out; | |
1001 | } | |
1002 | rc = 0; | |
1003 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) | |
1004 | rc = -EFAULT; | |
1005 | out: | |
1006 | release_sock(sk); | |
1007 | return rc; | |
1008 | } | |
1009 | ||
1010 | static struct net_proto_family llc_ui_family_ops = { | |
1011 | .family = PF_LLC, | |
1012 | .create = llc_ui_create, | |
1013 | .owner = THIS_MODULE, | |
1014 | }; | |
1015 | ||
1016 | static struct proto_ops llc_ui_ops = { | |
1017 | .family = PF_LLC, | |
1018 | .owner = THIS_MODULE, | |
1019 | .release = llc_ui_release, | |
1020 | .bind = llc_ui_bind, | |
1021 | .connect = llc_ui_connect, | |
1022 | .socketpair = sock_no_socketpair, | |
1023 | .accept = llc_ui_accept, | |
1024 | .getname = llc_ui_getname, | |
1025 | .poll = datagram_poll, | |
1026 | .ioctl = llc_ui_ioctl, | |
1027 | .listen = llc_ui_listen, | |
1028 | .shutdown = llc_ui_shutdown, | |
1029 | .setsockopt = llc_ui_setsockopt, | |
1030 | .getsockopt = llc_ui_getsockopt, | |
1031 | .sendmsg = llc_ui_sendmsg, | |
1032 | .recvmsg = llc_ui_recvmsg, | |
1033 | .mmap = sock_no_mmap, | |
1034 | .sendpage = sock_no_sendpage, | |
1035 | }; | |
1036 | ||
1037 | extern void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb); | |
1038 | extern void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb); | |
1039 | ||
1040 | static int __init llc2_init(void) | |
1041 | { | |
1042 | int rc = proto_register(&llc_proto, 0); | |
1043 | ||
1044 | if (rc != 0) | |
1045 | goto out; | |
1046 | ||
1047 | llc_build_offset_table(); | |
1048 | llc_station_init(); | |
1049 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; | |
1050 | rc = llc_proc_init(); | |
1051 | if (rc != 0) | |
1052 | goto out_unregister_llc_proto; | |
1053 | sock_register(&llc_ui_family_ops); | |
1054 | llc_add_pack(LLC_DEST_SAP, llc_sap_handler); | |
1055 | llc_add_pack(LLC_DEST_CONN, llc_conn_handler); | |
1056 | out: | |
1057 | return rc; | |
1058 | out_unregister_llc_proto: | |
1059 | proto_unregister(&llc_proto); | |
1060 | goto out; | |
1061 | } | |
1062 | ||
1063 | static void __exit llc2_exit(void) | |
1064 | { | |
1065 | llc_station_exit(); | |
1066 | llc_remove_pack(LLC_DEST_SAP); | |
1067 | llc_remove_pack(LLC_DEST_CONN); | |
1068 | sock_unregister(PF_LLC); | |
1069 | llc_proc_exit(); | |
1070 | proto_unregister(&llc_proto); | |
1071 | } | |
1072 | ||
1073 | module_init(llc2_init); | |
1074 | module_exit(llc2_exit); | |
1075 | ||
1076 | MODULE_LICENSE("GPL"); | |
1077 | MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003"); | |
1078 | MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support"); | |
1079 | MODULE_ALIAS_NETPROTO(PF_LLC); |