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 | { | |
ee5850de | 131 | sock_graft(sk, sock); |
1da177e4 | 132 | sk->sk_type = sock->type; |
1da177e4 LT |
133 | sock->ops = &llc_ui_ops; |
134 | } | |
135 | ||
136 | static struct proto llc_proto = { | |
9c005e01 | 137 | .name = "LLC", |
1da177e4 LT |
138 | .owner = THIS_MODULE, |
139 | .obj_size = sizeof(struct llc_sock), | |
140 | }; | |
141 | ||
142 | /** | |
143 | * llc_ui_create - alloc and init a new llc_ui socket | |
144 | * @sock: Socket to initialize and attach allocated sk to. | |
145 | * @protocol: Unused. | |
146 | * | |
147 | * Allocate and initialize a new llc_ui socket, validate the user wants a | |
148 | * socket type we have available. | |
149 | * Returns 0 upon success, negative upon failure. | |
150 | */ | |
1b8d7ae4 | 151 | static int llc_ui_create(struct net *net, struct socket *sock, int protocol) |
1da177e4 LT |
152 | { |
153 | struct sock *sk; | |
154 | int rc = -ESOCKTNOSUPPORT; | |
155 | ||
3480c63b PM |
156 | if (!capable(CAP_NET_RAW)) |
157 | return -EPERM; | |
158 | ||
1b8d7ae4 EB |
159 | if (net != &init_net) |
160 | return -EAFNOSUPPORT; | |
161 | ||
af426d32 | 162 | if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) { |
1da177e4 | 163 | rc = -ENOMEM; |
1b8d7ae4 | 164 | sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto); |
1da177e4 LT |
165 | if (sk) { |
166 | rc = 0; | |
167 | llc_ui_sk_init(sock, sk); | |
168 | } | |
169 | } | |
170 | return rc; | |
171 | } | |
172 | ||
173 | /** | |
174 | * llc_ui_release - shutdown socket | |
175 | * @sock: Socket to release. | |
176 | * | |
177 | * Shutdown and deallocate an existing socket. | |
178 | */ | |
179 | static int llc_ui_release(struct socket *sock) | |
180 | { | |
181 | struct sock *sk = sock->sk; | |
182 | struct llc_sock *llc; | |
183 | ||
af426d32 | 184 | if (unlikely(sk == NULL)) |
1da177e4 LT |
185 | goto out; |
186 | sock_hold(sk); | |
187 | lock_sock(sk); | |
188 | llc = llc_sk(sk); | |
0dc47877 | 189 | dprintk("%s: closing local(%02X) remote(%02X)\n", __func__, |
1da177e4 LT |
190 | llc->laddr.lsap, llc->daddr.lsap); |
191 | if (!llc_send_disc(sk)) | |
192 | llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); | |
2e1f47c7 ACM |
193 | if (!sock_flag(sk, SOCK_ZAPPED)) { |
194 | llc_sap_put(llc->sap); | |
1da177e4 | 195 | llc_sap_remove_socket(llc->sap, sk); |
2e1f47c7 | 196 | } |
1da177e4 | 197 | release_sock(sk); |
1da177e4 LT |
198 | if (llc->dev) |
199 | dev_put(llc->dev); | |
200 | sock_put(sk); | |
201 | llc_sk_free(sk); | |
202 | out: | |
203 | return 0; | |
204 | } | |
205 | ||
206 | /** | |
207 | * llc_ui_autoport - provide dynamically allocate SAP number | |
208 | * | |
209 | * Provide the caller with a dynamically allocated SAP number according | |
210 | * to the rules that are set in this function. Returns: 0, upon failure, | |
211 | * SAP number otherwise. | |
212 | */ | |
213 | static int llc_ui_autoport(void) | |
214 | { | |
215 | struct llc_sap *sap; | |
216 | int i, tries = 0; | |
217 | ||
218 | while (tries < LLC_SAP_DYN_TRIES) { | |
219 | for (i = llc_ui_sap_last_autoport; | |
220 | i < LLC_SAP_DYN_STOP; i += 2) { | |
221 | sap = llc_sap_find(i); | |
222 | if (!sap) { | |
223 | llc_ui_sap_last_autoport = i + 2; | |
224 | goto out; | |
225 | } | |
6e2144b7 | 226 | llc_sap_put(sap); |
1da177e4 LT |
227 | } |
228 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; | |
229 | tries++; | |
230 | } | |
231 | i = 0; | |
232 | out: | |
233 | return i; | |
234 | } | |
235 | ||
236 | /** | |
5a770c02 ACM |
237 | * llc_ui_autobind - automatically bind a socket to a sap |
238 | * @sock: socket to bind | |
239 | * @addr: address to connect to | |
240 | * | |
241 | * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't | |
242 | * specifically used llc_ui_bind to bind to an specific address/sap | |
1da177e4 | 243 | * |
1da177e4 LT |
244 | * Returns: 0 upon success, negative otherwise. |
245 | */ | |
246 | static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr) | |
247 | { | |
248 | struct sock *sk = sock->sk; | |
249 | struct llc_sock *llc = llc_sk(sk); | |
250 | struct llc_sap *sap; | |
251 | int rc = -EINVAL; | |
252 | ||
253 | if (!sock_flag(sk, SOCK_ZAPPED)) | |
254 | goto out; | |
255 | rc = -ENODEV; | |
881d966b | 256 | llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd); |
1da177e4 LT |
257 | if (!llc->dev) |
258 | goto out; | |
259 | rc = -EUSERS; | |
260 | llc->laddr.lsap = llc_ui_autoport(); | |
261 | if (!llc->laddr.lsap) | |
262 | goto out; | |
263 | rc = -EBUSY; /* some other network layer is using the sap */ | |
264 | sap = llc_sap_open(llc->laddr.lsap, NULL); | |
265 | if (!sap) | |
266 | goto out; | |
267 | memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN); | |
268 | memcpy(&llc->addr, addr, sizeof(llc->addr)); | |
269 | /* assign new connection to its SAP */ | |
270 | llc_sap_add_socket(sap, sk); | |
271 | sock_reset_flag(sk, SOCK_ZAPPED); | |
272 | rc = 0; | |
273 | out: | |
274 | return rc; | |
275 | } | |
276 | ||
277 | /** | |
278 | * llc_ui_bind - bind a socket to a specific address. | |
279 | * @sock: Socket to bind an address to. | |
280 | * @uaddr: Address the user wants the socket bound to. | |
281 | * @addrlen: Length of the uaddr structure. | |
282 | * | |
283 | * Bind a socket to a specific address. For llc a user is able to bind to | |
5a770c02 | 284 | * a specific sap only or mac + sap. |
1da177e4 LT |
285 | * If the user desires to bind to a specific mac + sap, it is possible to |
286 | * have multiple sap connections via multiple macs. | |
287 | * Bind and autobind for that matter must enforce the correct sap usage | |
288 | * otherwise all hell will break loose. | |
289 | * Returns: 0 upon success, negative otherwise. | |
290 | */ | |
291 | static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen) | |
292 | { | |
293 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; | |
294 | struct sock *sk = sock->sk; | |
295 | struct llc_sock *llc = llc_sk(sk); | |
296 | struct llc_sap *sap; | |
297 | int rc = -EINVAL; | |
298 | ||
0dc47877 | 299 | dprintk("%s: binding %02X\n", __func__, addr->sllc_sap); |
af426d32 | 300 | if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr))) |
1da177e4 LT |
301 | goto out; |
302 | rc = -EAFNOSUPPORT; | |
af426d32 | 303 | if (unlikely(addr->sllc_family != AF_LLC)) |
1da177e4 | 304 | goto out; |
cf309e3f JF |
305 | rc = -ENODEV; |
306 | rtnl_lock(); | |
881d966b | 307 | llc->dev = dev_getbyhwaddr(&init_net, addr->sllc_arphrd, addr->sllc_mac); |
cf309e3f JF |
308 | rtnl_unlock(); |
309 | if (!llc->dev) | |
310 | goto out; | |
1da177e4 LT |
311 | if (!addr->sllc_sap) { |
312 | rc = -EUSERS; | |
313 | addr->sllc_sap = llc_ui_autoport(); | |
314 | if (!addr->sllc_sap) | |
315 | goto out; | |
316 | } | |
317 | sap = llc_sap_find(addr->sllc_sap); | |
318 | if (!sap) { | |
319 | sap = llc_sap_open(addr->sllc_sap, NULL); | |
320 | rc = -EBUSY; /* some other network layer is using the sap */ | |
321 | if (!sap) | |
322 | goto out; | |
6e2144b7 | 323 | llc_sap_hold(sap); |
1da177e4 LT |
324 | } else { |
325 | struct llc_addr laddr, daddr; | |
326 | struct sock *ask; | |
327 | ||
328 | memset(&laddr, 0, sizeof(laddr)); | |
329 | memset(&daddr, 0, sizeof(daddr)); | |
330 | /* | |
59c51591 | 331 | * FIXME: check if the address is multicast, |
1da177e4 LT |
332 | * only SOCK_DGRAM can do this. |
333 | */ | |
334 | memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
335 | laddr.lsap = addr->sllc_sap; | |
336 | rc = -EADDRINUSE; /* mac + sap clash. */ | |
337 | ask = llc_lookup_established(sap, &daddr, &laddr); | |
338 | if (ask) { | |
339 | sock_put(ask); | |
6e2144b7 | 340 | goto out_put; |
1da177e4 LT |
341 | } |
342 | } | |
343 | llc->laddr.lsap = addr->sllc_sap; | |
344 | memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
345 | memcpy(&llc->addr, addr, sizeof(llc->addr)); | |
346 | /* assign new connection to its SAP */ | |
347 | llc_sap_add_socket(sap, sk); | |
348 | sock_reset_flag(sk, SOCK_ZAPPED); | |
349 | rc = 0; | |
6e2144b7 ACM |
350 | out_put: |
351 | llc_sap_put(sap); | |
1da177e4 LT |
352 | out: |
353 | return rc; | |
354 | } | |
355 | ||
356 | /** | |
357 | * llc_ui_shutdown - shutdown a connect llc2 socket. | |
358 | * @sock: Socket to shutdown. | |
359 | * @how: What part of the socket to shutdown. | |
360 | * | |
361 | * Shutdown a connected llc2 socket. Currently this function only supports | |
362 | * shutting down both sends and receives (2), we could probably make this | |
363 | * function such that a user can shutdown only half the connection but not | |
364 | * right now. | |
365 | * Returns: 0 upon success, negative otherwise. | |
366 | */ | |
367 | static int llc_ui_shutdown(struct socket *sock, int how) | |
368 | { | |
369 | struct sock *sk = sock->sk; | |
370 | int rc = -ENOTCONN; | |
371 | ||
372 | lock_sock(sk); | |
af426d32 | 373 | if (unlikely(sk->sk_state != TCP_ESTABLISHED)) |
1da177e4 LT |
374 | goto out; |
375 | rc = -EINVAL; | |
376 | if (how != 2) | |
377 | goto out; | |
378 | rc = llc_send_disc(sk); | |
379 | if (!rc) | |
380 | rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); | |
381 | /* Wake up anyone sleeping in poll */ | |
382 | sk->sk_state_change(sk); | |
383 | out: | |
384 | release_sock(sk); | |
385 | return rc; | |
386 | } | |
387 | ||
388 | /** | |
389 | * llc_ui_connect - Connect to a remote llc2 mac + sap. | |
390 | * @sock: Socket which will be connected to the remote destination. | |
391 | * @uaddr: Remote and possibly the local address of the new connection. | |
392 | * @addrlen: Size of uaddr structure. | |
393 | * @flags: Operational flags specified by the user. | |
394 | * | |
395 | * Connect to a remote llc2 mac + sap. The caller must specify the | |
396 | * destination mac and address to connect to. If the user hasn't previously | |
397 | * called bind(2) with a smac the address of the first interface of the | |
398 | * specified arp type will be used. | |
399 | * This function will autobind if user did not previously call bind. | |
400 | * Returns: 0 upon success, negative otherwise. | |
401 | */ | |
402 | static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr, | |
403 | int addrlen, int flags) | |
404 | { | |
405 | struct sock *sk = sock->sk; | |
406 | struct llc_sock *llc = llc_sk(sk); | |
407 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; | |
1da177e4 LT |
408 | int rc = -EINVAL; |
409 | ||
410 | lock_sock(sk); | |
af426d32 | 411 | if (unlikely(addrlen != sizeof(*addr))) |
1da177e4 LT |
412 | goto out; |
413 | rc = -EAFNOSUPPORT; | |
af426d32 ACM |
414 | if (unlikely(addr->sllc_family != AF_LLC)) |
415 | goto out; | |
416 | if (unlikely(sk->sk_type != SOCK_STREAM)) | |
417 | goto out; | |
418 | rc = -EALREADY; | |
419 | if (unlikely(sock->state == SS_CONNECTING)) | |
1da177e4 LT |
420 | goto out; |
421 | /* bind connection to sap if user hasn't done it. */ | |
422 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
423 | /* bind to sap with null dev, exclusive */ | |
424 | rc = llc_ui_autobind(sock, addr); | |
425 | if (rc) | |
426 | goto out; | |
1da177e4 | 427 | } |
5564af21 JF |
428 | llc->daddr.lsap = addr->sllc_sap; |
429 | memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
1da177e4 LT |
430 | sock->state = SS_CONNECTING; |
431 | sk->sk_state = TCP_SYN_SENT; | |
432 | llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap); | |
774ccb4f | 433 | rc = llc_establish_connection(sk, llc->dev->dev_addr, |
1da177e4 LT |
434 | addr->sllc_mac, addr->sllc_sap); |
435 | if (rc) { | |
0dc47877 | 436 | dprintk("%s: llc_ui_send_conn failed :-(\n", __func__); |
1da177e4 LT |
437 | sock->state = SS_UNCONNECTED; |
438 | sk->sk_state = TCP_CLOSE; | |
439 | goto out; | |
440 | } | |
b35bd110 ACM |
441 | |
442 | if (sk->sk_state == TCP_SYN_SENT) { | |
54fb7f25 | 443 | const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
b35bd110 ACM |
444 | |
445 | if (!timeo || !llc_ui_wait_for_conn(sk, timeo)) | |
446 | goto out; | |
447 | ||
448 | rc = sock_intr_errno(timeo); | |
449 | if (signal_pending(current)) | |
450 | goto out; | |
451 | } | |
452 | ||
453 | if (sk->sk_state == TCP_CLOSE) | |
454 | goto sock_error; | |
455 | ||
456 | sock->state = SS_CONNECTED; | |
457 | rc = 0; | |
1da177e4 LT |
458 | out: |
459 | release_sock(sk); | |
460 | return rc; | |
b35bd110 ACM |
461 | sock_error: |
462 | rc = sock_error(sk) ? : -ECONNABORTED; | |
463 | sock->state = SS_UNCONNECTED; | |
464 | goto out; | |
1da177e4 LT |
465 | } |
466 | ||
467 | /** | |
468 | * llc_ui_listen - allow a normal socket to accept incoming connections | |
469 | * @sock: Socket to allow incoming connections on. | |
470 | * @backlog: Number of connections to queue. | |
471 | * | |
472 | * Allow a normal socket to accept incoming connections. | |
473 | * Returns 0 upon success, negative otherwise. | |
474 | */ | |
475 | static int llc_ui_listen(struct socket *sock, int backlog) | |
476 | { | |
477 | struct sock *sk = sock->sk; | |
478 | int rc = -EINVAL; | |
479 | ||
480 | lock_sock(sk); | |
af426d32 | 481 | if (unlikely(sock->state != SS_UNCONNECTED)) |
1da177e4 LT |
482 | goto out; |
483 | rc = -EOPNOTSUPP; | |
af426d32 | 484 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
1da177e4 LT |
485 | goto out; |
486 | rc = -EAGAIN; | |
487 | if (sock_flag(sk, SOCK_ZAPPED)) | |
488 | goto out; | |
489 | rc = 0; | |
490 | if (!(unsigned)backlog) /* BSDism */ | |
491 | backlog = 1; | |
492 | sk->sk_max_ack_backlog = backlog; | |
493 | if (sk->sk_state != TCP_LISTEN) { | |
494 | sk->sk_ack_backlog = 0; | |
495 | sk->sk_state = TCP_LISTEN; | |
496 | } | |
497 | sk->sk_socket->flags |= __SO_ACCEPTCON; | |
498 | out: | |
499 | release_sock(sk); | |
500 | return rc; | |
501 | } | |
502 | ||
54fb7f25 | 503 | static int llc_ui_wait_for_disc(struct sock *sk, long timeout) |
1da177e4 | 504 | { |
b35bd110 ACM |
505 | DEFINE_WAIT(wait); |
506 | int rc = 0; | |
1da177e4 | 507 | |
54fb7f25 ACM |
508 | while (1) { |
509 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
510 | if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE)) | |
511 | break; | |
1da177e4 LT |
512 | rc = -ERESTARTSYS; |
513 | if (signal_pending(current)) | |
514 | break; | |
515 | rc = -EAGAIN; | |
516 | if (!timeout) | |
517 | break; | |
b35bd110 | 518 | rc = 0; |
1da177e4 | 519 | } |
b35bd110 | 520 | finish_wait(sk->sk_sleep, &wait); |
1da177e4 LT |
521 | return rc; |
522 | } | |
523 | ||
54fb7f25 | 524 | static int llc_ui_wait_for_conn(struct sock *sk, long timeout) |
1da177e4 | 525 | { |
b35bd110 | 526 | DEFINE_WAIT(wait); |
1da177e4 | 527 | |
54fb7f25 ACM |
528 | while (1) { |
529 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
530 | if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT)) | |
531 | break; | |
b35bd110 | 532 | if (signal_pending(current) || !timeout) |
1da177e4 LT |
533 | break; |
534 | } | |
b35bd110 ACM |
535 | finish_wait(sk->sk_sleep, &wait); |
536 | return timeout; | |
1da177e4 LT |
537 | } |
538 | ||
afdbe357 | 539 | static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout) |
1da177e4 | 540 | { |
b35bd110 | 541 | DEFINE_WAIT(wait); |
afdbe357 ACM |
542 | struct llc_sock *llc = llc_sk(sk); |
543 | int rc; | |
1da177e4 | 544 | |
54fb7f25 | 545 | while (1) { |
b35bd110 | 546 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
afdbe357 | 547 | rc = 0; |
54fb7f25 ACM |
548 | if (sk_wait_event(sk, &timeout, |
549 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
afdbe357 | 550 | (!llc_data_accept_state(llc->state) && |
451677c4 | 551 | !llc->remote_busy_flag && |
afdbe357 | 552 | !llc->p_flag))) |
1da177e4 | 553 | break; |
1da177e4 LT |
554 | rc = -ERESTARTSYS; |
555 | if (signal_pending(current)) | |
556 | break; | |
557 | rc = -EAGAIN; | |
558 | if (!timeout) | |
559 | break; | |
560 | } | |
b35bd110 | 561 | finish_wait(sk->sk_sleep, &wait); |
1da177e4 LT |
562 | return rc; |
563 | } | |
564 | ||
2928c19e | 565 | static int llc_wait_data(struct sock *sk, long timeo) |
1da177e4 | 566 | { |
1da177e4 LT |
567 | int rc; |
568 | ||
54fb7f25 | 569 | while (1) { |
afdbe357 ACM |
570 | /* |
571 | * POSIX 1003.1g mandates this order. | |
572 | */ | |
c1cbe4b7 BL |
573 | rc = sock_error(sk); |
574 | if (rc) | |
afdbe357 | 575 | break; |
1da177e4 | 576 | rc = 0; |
afdbe357 | 577 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
1da177e4 | 578 | break; |
afdbe357 ACM |
579 | rc = -EAGAIN; |
580 | if (!timeo) | |
581 | break; | |
582 | rc = sock_intr_errno(timeo); | |
1da177e4 LT |
583 | if (signal_pending(current)) |
584 | break; | |
afdbe357 ACM |
585 | rc = 0; |
586 | if (sk_wait_data(sk, &timeo)) | |
1da177e4 LT |
587 | break; |
588 | } | |
1da177e4 LT |
589 | return rc; |
590 | } | |
591 | ||
592 | /** | |
593 | * llc_ui_accept - accept a new incoming connection. | |
594 | * @sock: Socket which connections arrive on. | |
595 | * @newsock: Socket to move incoming connection to. | |
596 | * @flags: User specified operational flags. | |
597 | * | |
598 | * Accept a new incoming connection. | |
599 | * Returns 0 upon success, negative otherwise. | |
600 | */ | |
601 | static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags) | |
602 | { | |
603 | struct sock *sk = sock->sk, *newsk; | |
604 | struct llc_sock *llc, *newllc; | |
605 | struct sk_buff *skb; | |
606 | int rc = -EOPNOTSUPP; | |
607 | ||
0dc47877 | 608 | dprintk("%s: accepting on %02X\n", __func__, |
d57b1869 | 609 | llc_sk(sk)->laddr.lsap); |
1da177e4 | 610 | lock_sock(sk); |
af426d32 | 611 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
1da177e4 LT |
612 | goto out; |
613 | rc = -EINVAL; | |
af426d32 ACM |
614 | if (unlikely(sock->state != SS_UNCONNECTED || |
615 | sk->sk_state != TCP_LISTEN)) | |
1da177e4 LT |
616 | goto out; |
617 | /* wait for a connection to arrive. */ | |
b35bd110 | 618 | if (skb_queue_empty(&sk->sk_receive_queue)) { |
afdbe357 | 619 | rc = llc_wait_data(sk, sk->sk_rcvtimeo); |
b35bd110 ACM |
620 | if (rc) |
621 | goto out; | |
622 | } | |
0dc47877 | 623 | dprintk("%s: got a new connection on %02X\n", __func__, |
d57b1869 | 624 | llc_sk(sk)->laddr.lsap); |
1da177e4 LT |
625 | skb = skb_dequeue(&sk->sk_receive_queue); |
626 | rc = -EINVAL; | |
627 | if (!skb->sk) | |
628 | goto frees; | |
629 | rc = 0; | |
630 | newsk = skb->sk; | |
631 | /* attach connection to a new socket. */ | |
632 | llc_ui_sk_init(newsock, newsk); | |
633 | sock_reset_flag(newsk, SOCK_ZAPPED); | |
634 | newsk->sk_state = TCP_ESTABLISHED; | |
635 | newsock->state = SS_CONNECTED; | |
636 | llc = llc_sk(sk); | |
637 | newllc = llc_sk(newsk); | |
638 | memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr)); | |
639 | newllc->link = llc_ui_next_link_no(newllc->laddr.lsap); | |
640 | ||
641 | /* put original socket back into a clean listen state. */ | |
642 | sk->sk_state = TCP_LISTEN; | |
643 | sk->sk_ack_backlog--; | |
0dc47877 | 644 | dprintk("%s: ok success on %02X, client on %02X\n", __func__, |
1da177e4 LT |
645 | llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap); |
646 | frees: | |
647 | kfree_skb(skb); | |
648 | out: | |
649 | release_sock(sk); | |
650 | return rc; | |
651 | } | |
652 | ||
653 | /** | |
654 | * llc_ui_recvmsg - copy received data to the socket user. | |
655 | * @sock: Socket to copy data from. | |
656 | * @msg: Various user space related information. | |
8420e1b5 | 657 | * @len: Size of user buffer. |
1da177e4 LT |
658 | * @flags: User specified flags. |
659 | * | |
660 | * Copy received data to the socket user. | |
661 | * Returns non-negative upon success, negative otherwise. | |
662 | */ | |
663 | static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock, | |
8420e1b5 | 664 | struct msghdr *msg, size_t len, int flags) |
1da177e4 | 665 | { |
1da177e4 | 666 | struct sockaddr_llc *uaddr = (struct sockaddr_llc *)msg->msg_name; |
8420e1b5 ACM |
667 | const int nonblock = flags & MSG_DONTWAIT; |
668 | struct sk_buff *skb = NULL; | |
669 | struct sock *sk = sock->sk; | |
670 | struct llc_sock *llc = llc_sk(sk); | |
1da177e4 | 671 | size_t copied = 0; |
8420e1b5 ACM |
672 | u32 peek_seq = 0; |
673 | u32 *seq; | |
674 | unsigned long used; | |
675 | int target; /* Read at least this many bytes */ | |
676 | long timeo; | |
1da177e4 | 677 | |
1da177e4 | 678 | lock_sock(sk); |
8420e1b5 | 679 | copied = -ENOTCONN; |
29efcd26 | 680 | if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN)) |
1da177e4 | 681 | goto out; |
8420e1b5 ACM |
682 | |
683 | timeo = sock_rcvtimeo(sk, nonblock); | |
684 | ||
685 | seq = &llc->copied_seq; | |
686 | if (flags & MSG_PEEK) { | |
687 | peek_seq = llc->copied_seq; | |
688 | seq = &peek_seq; | |
d57b1869 | 689 | } |
8420e1b5 ACM |
690 | |
691 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
692 | copied = 0; | |
693 | ||
694 | do { | |
695 | u32 offset; | |
696 | ||
697 | /* | |
698 | * We need to check signals first, to get correct SIGURG | |
699 | * handling. FIXME: Need to check this doesn't impact 1003.1g | |
700 | * and move it down to the bottom of the loop | |
701 | */ | |
702 | if (signal_pending(current)) { | |
703 | if (copied) | |
704 | break; | |
705 | copied = timeo ? sock_intr_errno(timeo) : -EAGAIN; | |
706 | break; | |
707 | } | |
708 | ||
709 | /* Next get a buffer. */ | |
710 | ||
711 | skb = skb_peek(&sk->sk_receive_queue); | |
712 | if (skb) { | |
713 | offset = *seq; | |
714 | goto found_ok_skb; | |
715 | } | |
716 | /* Well, if we have backlog, try to process it now yet. */ | |
717 | ||
718 | if (copied >= target && !sk->sk_backlog.tail) | |
719 | break; | |
720 | ||
721 | if (copied) { | |
722 | if (sk->sk_err || | |
723 | sk->sk_state == TCP_CLOSE || | |
724 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
725 | !timeo || | |
726 | (flags & MSG_PEEK)) | |
727 | break; | |
728 | } else { | |
729 | if (sock_flag(sk, SOCK_DONE)) | |
730 | break; | |
731 | ||
732 | if (sk->sk_err) { | |
733 | copied = sock_error(sk); | |
734 | break; | |
735 | } | |
736 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
737 | break; | |
738 | ||
29efcd26 | 739 | if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) { |
8420e1b5 ACM |
740 | if (!sock_flag(sk, SOCK_DONE)) { |
741 | /* | |
742 | * This occurs when user tries to read | |
743 | * from never connected socket. | |
744 | */ | |
745 | copied = -ENOTCONN; | |
746 | break; | |
747 | } | |
748 | break; | |
749 | } | |
750 | if (!timeo) { | |
751 | copied = -EAGAIN; | |
752 | break; | |
753 | } | |
754 | } | |
755 | ||
756 | if (copied >= target) { /* Do not sleep, just process backlog. */ | |
757 | release_sock(sk); | |
758 | lock_sock(sk); | |
759 | } else | |
760 | sk_wait_data(sk, &timeo); | |
761 | ||
762 | if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) { | |
763 | if (net_ratelimit()) | |
764 | printk(KERN_DEBUG "LLC(%s:%d): Application " | |
765 | "bug, race in MSG_PEEK.\n", | |
ba25f9dc | 766 | current->comm, task_pid_nr(current)); |
8420e1b5 ACM |
767 | peek_seq = llc->copied_seq; |
768 | } | |
769 | continue; | |
770 | found_ok_skb: | |
771 | /* Ok so how much can we use? */ | |
772 | used = skb->len - offset; | |
773 | if (len < used) | |
774 | used = len; | |
775 | ||
776 | if (!(flags & MSG_TRUNC)) { | |
777 | int rc = skb_copy_datagram_iovec(skb, offset, | |
778 | msg->msg_iov, used); | |
779 | if (rc) { | |
780 | /* Exception. Bailout! */ | |
781 | if (!copied) | |
782 | copied = -EFAULT; | |
783 | break; | |
784 | } | |
785 | } | |
786 | ||
787 | *seq += used; | |
788 | copied += used; | |
789 | len -= used; | |
790 | ||
8420e1b5 | 791 | if (!(flags & MSG_PEEK)) { |
624d1164 | 792 | sk_eat_skb(sk, skb, 0); |
8420e1b5 ACM |
793 | *seq = 0; |
794 | } | |
30a584d9 SH |
795 | |
796 | /* For non stream protcols we get one packet per recvmsg call */ | |
797 | if (sk->sk_type != SOCK_STREAM) | |
798 | goto copy_uaddr; | |
799 | ||
800 | /* Partial read */ | |
801 | if (used + offset < skb->len) | |
802 | continue; | |
8420e1b5 ACM |
803 | } while (len > 0); |
804 | ||
1da177e4 LT |
805 | out: |
806 | release_sock(sk); | |
8420e1b5 ACM |
807 | return copied; |
808 | copy_uaddr: | |
809 | if (uaddr != NULL && skb != NULL) { | |
810 | memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr)); | |
811 | msg->msg_namelen = sizeof(*uaddr); | |
812 | } | |
813 | goto out; | |
1da177e4 LT |
814 | } |
815 | ||
816 | /** | |
817 | * llc_ui_sendmsg - Transmit data provided by the socket user. | |
818 | * @sock: Socket to transmit data from. | |
819 | * @msg: Various user related information. | |
820 | * @len: Length of data to transmit. | |
821 | * | |
822 | * Transmit data provided by the socket user. | |
823 | * Returns non-negative upon success, negative otherwise. | |
824 | */ | |
825 | static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock, | |
826 | struct msghdr *msg, size_t len) | |
827 | { | |
828 | struct sock *sk = sock->sk; | |
829 | struct llc_sock *llc = llc_sk(sk); | |
830 | struct sockaddr_llc *addr = (struct sockaddr_llc *)msg->msg_name; | |
831 | int flags = msg->msg_flags; | |
832 | int noblock = flags & MSG_DONTWAIT; | |
1da177e4 LT |
833 | struct sk_buff *skb; |
834 | size_t size = 0; | |
835 | int rc = -EINVAL, copied = 0, hdrlen; | |
836 | ||
0dc47877 | 837 | dprintk("%s: sending from %02X to %02X\n", __func__, |
1da177e4 LT |
838 | llc->laddr.lsap, llc->daddr.lsap); |
839 | lock_sock(sk); | |
840 | if (addr) { | |
841 | if (msg->msg_namelen < sizeof(*addr)) | |
842 | goto release; | |
843 | } else { | |
844 | if (llc_ui_addr_null(&llc->addr)) | |
845 | goto release; | |
846 | addr = &llc->addr; | |
847 | } | |
848 | /* must bind connection to sap if user hasn't done it. */ | |
849 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
850 | /* bind to sap with null dev, exclusive. */ | |
851 | rc = llc_ui_autobind(sock, addr); | |
852 | if (rc) | |
853 | goto release; | |
854 | } | |
774ccb4f | 855 | hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr); |
1da177e4 | 856 | size = hdrlen + len; |
774ccb4f ACM |
857 | if (size > llc->dev->mtu) |
858 | size = llc->dev->mtu; | |
1da177e4 LT |
859 | copied = size - hdrlen; |
860 | release_sock(sk); | |
861 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
862 | lock_sock(sk); | |
863 | if (!skb) | |
864 | goto release; | |
774ccb4f | 865 | skb->dev = llc->dev; |
1da177e4 | 866 | skb->protocol = llc_proto_type(addr->sllc_arphrd); |
d57b1869 | 867 | skb_reserve(skb, hdrlen); |
1da177e4 LT |
868 | rc = memcpy_fromiovec(skb_put(skb, copied), msg->msg_iov, copied); |
869 | if (rc) | |
870 | goto out; | |
871 | if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) { | |
872 | llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac, | |
873 | addr->sllc_sap); | |
874 | goto out; | |
875 | } | |
876 | if (addr->sllc_test) { | |
877 | llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac, | |
878 | addr->sllc_sap); | |
879 | goto out; | |
880 | } | |
881 | if (addr->sllc_xid) { | |
882 | llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac, | |
883 | addr->sllc_sap); | |
884 | goto out; | |
885 | } | |
886 | rc = -ENOPROTOOPT; | |
887 | if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua)) | |
888 | goto out; | |
889 | rc = llc_ui_send_data(sk, skb, noblock); | |
1da177e4 | 890 | out: |
249ff1c6 | 891 | if (rc) { |
1da177e4 LT |
892 | kfree_skb(skb); |
893 | release: | |
1da177e4 | 894 | dprintk("%s: failed sending from %02X to %02X: %d\n", |
0dc47877 | 895 | __func__, llc->laddr.lsap, llc->daddr.lsap, rc); |
249ff1c6 | 896 | } |
1da177e4 LT |
897 | release_sock(sk); |
898 | return rc ? : copied; | |
899 | } | |
900 | ||
901 | /** | |
902 | * llc_ui_getname - return the address info of a socket | |
903 | * @sock: Socket to get address of. | |
904 | * @uaddr: Address structure to return information. | |
905 | * @uaddrlen: Length of address structure. | |
906 | * @peer: Does user want local or remote address information. | |
907 | * | |
908 | * Return the address information of a socket. | |
909 | */ | |
910 | static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr, | |
911 | int *uaddrlen, int peer) | |
912 | { | |
913 | struct sockaddr_llc sllc; | |
914 | struct sock *sk = sock->sk; | |
915 | struct llc_sock *llc = llc_sk(sk); | |
916 | int rc = 0; | |
917 | ||
918 | lock_sock(sk); | |
919 | if (sock_flag(sk, SOCK_ZAPPED)) | |
920 | goto out; | |
921 | *uaddrlen = sizeof(sllc); | |
922 | memset(uaddr, 0, *uaddrlen); | |
923 | if (peer) { | |
924 | rc = -ENOTCONN; | |
925 | if (sk->sk_state != TCP_ESTABLISHED) | |
926 | goto out; | |
927 | if(llc->dev) | |
928 | sllc.sllc_arphrd = llc->dev->type; | |
929 | sllc.sllc_sap = llc->daddr.lsap; | |
930 | memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN); | |
931 | } else { | |
932 | rc = -EINVAL; | |
933 | if (!llc->sap) | |
934 | goto out; | |
935 | sllc.sllc_sap = llc->sap->laddr.lsap; | |
936 | ||
937 | if (llc->dev) { | |
938 | sllc.sllc_arphrd = llc->dev->type; | |
939 | memcpy(&sllc.sllc_mac, &llc->dev->dev_addr, | |
940 | IFHWADDRLEN); | |
941 | } | |
942 | } | |
943 | rc = 0; | |
944 | sllc.sllc_family = AF_LLC; | |
945 | memcpy(uaddr, &sllc, sizeof(sllc)); | |
946 | out: | |
947 | release_sock(sk); | |
948 | return rc; | |
949 | } | |
950 | ||
951 | /** | |
952 | * llc_ui_ioctl - io controls for PF_LLC | |
953 | * @sock: Socket to get/set info | |
954 | * @cmd: command | |
955 | * @arg: optional argument for cmd | |
956 | * | |
957 | * get/set info on llc sockets | |
958 | */ | |
959 | static int llc_ui_ioctl(struct socket *sock, unsigned int cmd, | |
960 | unsigned long arg) | |
961 | { | |
b5e5fa5e | 962 | return -ENOIOCTLCMD; |
1da177e4 LT |
963 | } |
964 | ||
965 | /** | |
966 | * llc_ui_setsockopt - set various connection specific parameters. | |
967 | * @sock: Socket to set options on. | |
968 | * @level: Socket level user is requesting operations on. | |
969 | * @optname: Operation name. | |
970 | * @optval User provided operation data. | |
971 | * @optlen: Length of optval. | |
972 | * | |
973 | * Set various connection specific parameters. | |
974 | */ | |
975 | static int llc_ui_setsockopt(struct socket *sock, int level, int optname, | |
976 | char __user *optval, int optlen) | |
977 | { | |
978 | struct sock *sk = sock->sk; | |
979 | struct llc_sock *llc = llc_sk(sk); | |
980 | int rc = -EINVAL, opt; | |
981 | ||
982 | lock_sock(sk); | |
af426d32 | 983 | if (unlikely(level != SOL_LLC || optlen != sizeof(int))) |
1da177e4 LT |
984 | goto out; |
985 | rc = get_user(opt, (int __user *)optval); | |
986 | if (rc) | |
987 | goto out; | |
988 | rc = -EINVAL; | |
989 | switch (optname) { | |
990 | case LLC_OPT_RETRY: | |
991 | if (opt > LLC_OPT_MAX_RETRY) | |
992 | goto out; | |
993 | llc->n2 = opt; | |
994 | break; | |
995 | case LLC_OPT_SIZE: | |
996 | if (opt > LLC_OPT_MAX_SIZE) | |
997 | goto out; | |
998 | llc->n1 = opt; | |
999 | break; | |
1000 | case LLC_OPT_ACK_TMR_EXP: | |
1001 | if (opt > LLC_OPT_MAX_ACK_TMR_EXP) | |
1002 | goto out; | |
590232a7 | 1003 | llc->ack_timer.expire = opt * HZ; |
1da177e4 LT |
1004 | break; |
1005 | case LLC_OPT_P_TMR_EXP: | |
1006 | if (opt > LLC_OPT_MAX_P_TMR_EXP) | |
1007 | goto out; | |
590232a7 | 1008 | llc->pf_cycle_timer.expire = opt * HZ; |
1da177e4 LT |
1009 | break; |
1010 | case LLC_OPT_REJ_TMR_EXP: | |
1011 | if (opt > LLC_OPT_MAX_REJ_TMR_EXP) | |
1012 | goto out; | |
590232a7 | 1013 | llc->rej_sent_timer.expire = opt * HZ; |
1da177e4 LT |
1014 | break; |
1015 | case LLC_OPT_BUSY_TMR_EXP: | |
1016 | if (opt > LLC_OPT_MAX_BUSY_TMR_EXP) | |
1017 | goto out; | |
590232a7 | 1018 | llc->busy_state_timer.expire = opt * HZ; |
1da177e4 LT |
1019 | break; |
1020 | case LLC_OPT_TX_WIN: | |
1021 | if (opt > LLC_OPT_MAX_WIN) | |
1022 | goto out; | |
1023 | llc->k = opt; | |
1024 | break; | |
1025 | case LLC_OPT_RX_WIN: | |
1026 | if (opt > LLC_OPT_MAX_WIN) | |
1027 | goto out; | |
1028 | llc->rw = opt; | |
1029 | break; | |
1030 | default: | |
1031 | rc = -ENOPROTOOPT; | |
1032 | goto out; | |
1033 | } | |
1034 | rc = 0; | |
1035 | out: | |
1036 | release_sock(sk); | |
1037 | return rc; | |
1038 | } | |
1039 | ||
1040 | /** | |
1041 | * llc_ui_getsockopt - get connection specific socket info | |
1042 | * @sock: Socket to get information from. | |
1043 | * @level: Socket level user is requesting operations on. | |
1044 | * @optname: Operation name. | |
1045 | * @optval: Variable to return operation data in. | |
1046 | * @optlen: Length of optval. | |
1047 | * | |
1048 | * Get connection specific socket information. | |
1049 | */ | |
1050 | static int llc_ui_getsockopt(struct socket *sock, int level, int optname, | |
1051 | char __user *optval, int __user *optlen) | |
1052 | { | |
1053 | struct sock *sk = sock->sk; | |
1054 | struct llc_sock *llc = llc_sk(sk); | |
1055 | int val = 0, len = 0, rc = -EINVAL; | |
1056 | ||
1057 | lock_sock(sk); | |
af426d32 | 1058 | if (unlikely(level != SOL_LLC)) |
1da177e4 LT |
1059 | goto out; |
1060 | rc = get_user(len, optlen); | |
1061 | if (rc) | |
1062 | goto out; | |
1063 | rc = -EINVAL; | |
1064 | if (len != sizeof(int)) | |
1065 | goto out; | |
1066 | switch (optname) { | |
1067 | case LLC_OPT_RETRY: | |
590232a7 | 1068 | val = llc->n2; break; |
1da177e4 | 1069 | case LLC_OPT_SIZE: |
590232a7 | 1070 | val = llc->n1; break; |
1da177e4 | 1071 | case LLC_OPT_ACK_TMR_EXP: |
590232a7 | 1072 | val = llc->ack_timer.expire / HZ; break; |
1da177e4 | 1073 | case LLC_OPT_P_TMR_EXP: |
590232a7 | 1074 | val = llc->pf_cycle_timer.expire / HZ; break; |
1da177e4 | 1075 | case LLC_OPT_REJ_TMR_EXP: |
590232a7 | 1076 | val = llc->rej_sent_timer.expire / HZ; break; |
1da177e4 | 1077 | case LLC_OPT_BUSY_TMR_EXP: |
590232a7 | 1078 | val = llc->busy_state_timer.expire / HZ; break; |
1da177e4 LT |
1079 | case LLC_OPT_TX_WIN: |
1080 | val = llc->k; break; | |
1081 | case LLC_OPT_RX_WIN: | |
1082 | val = llc->rw; break; | |
1083 | default: | |
1084 | rc = -ENOPROTOOPT; | |
1085 | goto out; | |
1086 | } | |
1087 | rc = 0; | |
1088 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) | |
1089 | rc = -EFAULT; | |
1090 | out: | |
1091 | release_sock(sk); | |
1092 | return rc; | |
1093 | } | |
1094 | ||
1095 | static struct net_proto_family llc_ui_family_ops = { | |
1096 | .family = PF_LLC, | |
1097 | .create = llc_ui_create, | |
1098 | .owner = THIS_MODULE, | |
1099 | }; | |
1100 | ||
90ddc4f0 | 1101 | static const struct proto_ops llc_ui_ops = { |
1da177e4 LT |
1102 | .family = PF_LLC, |
1103 | .owner = THIS_MODULE, | |
1104 | .release = llc_ui_release, | |
1105 | .bind = llc_ui_bind, | |
1106 | .connect = llc_ui_connect, | |
1107 | .socketpair = sock_no_socketpair, | |
1108 | .accept = llc_ui_accept, | |
1109 | .getname = llc_ui_getname, | |
1110 | .poll = datagram_poll, | |
1111 | .ioctl = llc_ui_ioctl, | |
1112 | .listen = llc_ui_listen, | |
1113 | .shutdown = llc_ui_shutdown, | |
1114 | .setsockopt = llc_ui_setsockopt, | |
1115 | .getsockopt = llc_ui_getsockopt, | |
1116 | .sendmsg = llc_ui_sendmsg, | |
1117 | .recvmsg = llc_ui_recvmsg, | |
1118 | .mmap = sock_no_mmap, | |
1119 | .sendpage = sock_no_sendpage, | |
1120 | }; | |
1121 | ||
590232a7 | 1122 | static char llc_proc_err_msg[] __initdata = |
d57b1869 | 1123 | KERN_CRIT "LLC: Unable to register the proc_fs entries\n"; |
590232a7 | 1124 | static char llc_sysctl_err_msg[] __initdata = |
d57b1869 | 1125 | KERN_CRIT "LLC: Unable to register the sysctl entries\n"; |
590232a7 | 1126 | static char llc_sock_err_msg[] __initdata = |
d57b1869 | 1127 | KERN_CRIT "LLC: Unable to register the network family\n"; |
590232a7 | 1128 | |
1da177e4 LT |
1129 | static int __init llc2_init(void) |
1130 | { | |
1131 | int rc = proto_register(&llc_proto, 0); | |
1132 | ||
1133 | if (rc != 0) | |
1134 | goto out; | |
1135 | ||
1136 | llc_build_offset_table(); | |
1137 | llc_station_init(); | |
1138 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; | |
1139 | rc = llc_proc_init(); | |
590232a7 ACM |
1140 | if (rc != 0) { |
1141 | printk(llc_proc_err_msg); | |
1da177e4 | 1142 | goto out_unregister_llc_proto; |
590232a7 ACM |
1143 | } |
1144 | rc = llc_sysctl_init(); | |
1145 | if (rc) { | |
1146 | printk(llc_sysctl_err_msg); | |
1147 | goto out_proc; | |
1148 | } | |
1149 | rc = sock_register(&llc_ui_family_ops); | |
1150 | if (rc) { | |
1151 | printk(llc_sock_err_msg); | |
1152 | goto out_sysctl; | |
1153 | } | |
1da177e4 LT |
1154 | llc_add_pack(LLC_DEST_SAP, llc_sap_handler); |
1155 | llc_add_pack(LLC_DEST_CONN, llc_conn_handler); | |
1156 | out: | |
1157 | return rc; | |
590232a7 ACM |
1158 | out_sysctl: |
1159 | llc_sysctl_exit(); | |
1160 | out_proc: | |
1161 | llc_proc_exit(); | |
1da177e4 LT |
1162 | out_unregister_llc_proto: |
1163 | proto_unregister(&llc_proto); | |
1164 | goto out; | |
1165 | } | |
1166 | ||
1167 | static void __exit llc2_exit(void) | |
1168 | { | |
1169 | llc_station_exit(); | |
1170 | llc_remove_pack(LLC_DEST_SAP); | |
1171 | llc_remove_pack(LLC_DEST_CONN); | |
1172 | sock_unregister(PF_LLC); | |
1173 | llc_proc_exit(); | |
590232a7 | 1174 | llc_sysctl_exit(); |
1da177e4 LT |
1175 | proto_unregister(&llc_proto); |
1176 | } | |
1177 | ||
1178 | module_init(llc2_init); | |
1179 | module_exit(llc2_exit); | |
1180 | ||
1181 | MODULE_LICENSE("GPL"); | |
1182 | MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003"); | |
1183 | MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support"); | |
1184 | MODULE_ALIAS_NETPROTO(PF_LLC); |