blob: 582612998211d24aa8d4aea919eed1ba1e994db3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
Arnaldo Carvalho de Melo6e2144b2005-09-22 04:43:05 -030023#include <linux/compiler.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/kernel.h>
25#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/rtnetlink.h>
27#include <linux/init.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090028#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <net/llc.h>
30#include <net/llc_sap.h>
31#include <net/llc_pdu.h>
32#include <net/llc_conn.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070033#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
35/* remember: uninitialized global data is zeroed because its in .bss */
36static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
37static u16 llc_ui_sap_link_no_max[256];
38static struct sockaddr_llc llc_ui_addrnull;
Eric Dumazet90ddc4f2005-12-22 12:49:22 -080039static const struct proto_ops llc_ui_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -030041static int llc_ui_wait_for_conn(struct sock *sk, long timeout);
42static int llc_ui_wait_for_disc(struct sock *sk, long timeout);
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -030043static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
45#if 0
46#define dprintk(args...) printk(KERN_DEBUG args)
47#else
48#define dprintk(args...)
49#endif
50
Octavian Purdilae5cd6fe2009-12-26 11:51:00 +000051/* Maybe we'll add some more in the future. */
52#define LLC_CMSG_PKTINFO 1
53
54
Linus Torvalds1da177e2005-04-16 15:20:36 -070055/**
56 * llc_ui_next_link_no - return the next unused link number for a sap
57 * @sap: Address of sap to get link number from.
58 *
59 * Return the next unused link number for a given sap.
60 */
Arnaldo Carvalho de Melo2342c992006-03-20 21:27:43 -080061static inline u16 llc_ui_next_link_no(int sap)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062{
63 return llc_ui_sap_link_no_max[sap]++;
64}
65
66/**
67 * llc_proto_type - return eth protocol for ARP header type
68 * @arphrd: ARP header type.
69 *
70 * Given an ARP header type return the corresponding ethernet protocol.
71 */
Al Viro3fbd4182006-11-08 00:26:05 -080072static inline __be16 llc_proto_type(u16 arphrd)
Linus Torvalds1da177e2005-04-16 15:20:36 -070073{
74 return arphrd == ARPHRD_IEEE802_TR ?
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +090075 htons(ETH_P_TR_802_2) : htons(ETH_P_802_2);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076}
77
78/**
79 * llc_ui_addr_null - determines if a address structure is null
80 * @addr: Address to test if null.
81 */
Arnaldo Carvalho de Melo2342c992006-03-20 21:27:43 -080082static inline u8 llc_ui_addr_null(struct sockaddr_llc *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070083{
84 return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr));
85}
86
87/**
88 * llc_ui_header_len - return length of llc header based on operation
89 * @sk: Socket which contains a valid llc socket type.
90 * @addr: Complete sockaddr_llc structure received from the user.
91 *
92 * Provide the length of the llc header depending on what kind of
93 * operation the user would like to perform and the type of socket.
94 * Returns the correct llc header length.
95 */
Arnaldo Carvalho de Melo2342c992006-03-20 21:27:43 -080096static inline u8 llc_ui_header_len(struct sock *sk, struct sockaddr_llc *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070097{
98 u8 rc = LLC_PDU_LEN_U;
99
100 if (addr->sllc_test || addr->sllc_xid)
101 rc = LLC_PDU_LEN_U;
102 else if (sk->sk_type == SOCK_STREAM)
103 rc = LLC_PDU_LEN_I;
104 return rc;
105}
106
107/**
108 * llc_ui_send_data - send data via reliable llc2 connection
109 * @sk: Connection the socket is using.
110 * @skb: Data the user wishes to send.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 * @noblock: can we block waiting for data?
112 *
113 * Send data via reliable llc2 connection.
114 * Returns 0 upon success, non-zero if action did not succeed.
115 */
116static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock)
117{
118 struct llc_sock* llc = llc_sk(sk);
119 int rc = 0;
120
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +0900121 if (unlikely(llc_data_accept_state(llc->state) ||
Jochen Friedrich451677c2005-11-14 21:57:46 -0800122 llc->remote_busy_flag ||
123 llc->p_flag)) {
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300124 long timeout = sock_sndtimeo(sk, noblock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126 rc = llc_ui_wait_for_busy_core(sk, timeout);
127 }
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300128 if (unlikely(!rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 rc = llc_build_and_send_pkt(sk, skb);
130 return rc;
131}
132
133static void llc_ui_sk_init(struct socket *sock, struct sock *sk)
134{
David S. Milleree5850d2008-06-17 01:21:03 -0700135 sock_graft(sk, sock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 sk->sk_type = sock->type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 sock->ops = &llc_ui_ops;
138}
139
140static struct proto llc_proto = {
Arnaldo Carvalho de Melo9c005e02006-03-20 21:27:23 -0800141 .name = "LLC",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 .owner = THIS_MODULE,
143 .obj_size = sizeof(struct llc_sock),
Octavian Purdilab76f5a82009-12-26 11:51:02 +0000144 .slab_flags = SLAB_DESTROY_BY_RCU,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145};
146
147/**
148 * llc_ui_create - alloc and init a new llc_ui socket
Eric Paris3f378b62009-11-05 22:18:14 -0800149 * @net: network namespace (must be default network)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 * @sock: Socket to initialize and attach allocated sk to.
151 * @protocol: Unused.
Eric Paris3f378b62009-11-05 22:18:14 -0800152 * @kern: on behalf of kernel or userspace
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 *
154 * Allocate and initialize a new llc_ui socket, validate the user wants a
155 * socket type we have available.
156 * Returns 0 upon success, negative upon failure.
157 */
Eric Paris3f378b62009-11-05 22:18:14 -0800158static int llc_ui_create(struct net *net, struct socket *sock, int protocol,
159 int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160{
161 struct sock *sk;
162 int rc = -ESOCKTNOSUPPORT;
163
Patrick McHardy3480c632008-03-27 20:28:10 -0700164 if (!capable(CAP_NET_RAW))
165 return -EPERM;
166
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800167 if (!net_eq(net, &init_net))
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700168 return -EAFNOSUPPORT;
169
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300170 if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 rc = -ENOMEM;
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700172 sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 if (sk) {
174 rc = 0;
175 llc_ui_sk_init(sock, sk);
176 }
177 }
178 return rc;
179}
180
181/**
182 * llc_ui_release - shutdown socket
183 * @sock: Socket to release.
184 *
185 * Shutdown and deallocate an existing socket.
186 */
187static int llc_ui_release(struct socket *sock)
188{
189 struct sock *sk = sock->sk;
190 struct llc_sock *llc;
191
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300192 if (unlikely(sk == NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 goto out;
194 sock_hold(sk);
195 lock_sock(sk);
196 llc = llc_sk(sk);
Harvey Harrison0dc47872008-03-05 20:47:47 -0800197 dprintk("%s: closing local(%02X) remote(%02X)\n", __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 llc->laddr.lsap, llc->daddr.lsap);
199 if (!llc_send_disc(sk))
200 llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
Octavian Purdila3100aa92009-12-26 11:51:08 +0000201 if (!sock_flag(sk, SOCK_ZAPPED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 llc_sap_remove_socket(llc->sap, sk);
203 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 if (llc->dev)
205 dev_put(llc->dev);
206 sock_put(sk);
207 llc_sk_free(sk);
208out:
209 return 0;
210}
211
212/**
213 * llc_ui_autoport - provide dynamically allocate SAP number
214 *
215 * Provide the caller with a dynamically allocated SAP number according
216 * to the rules that are set in this function. Returns: 0, upon failure,
217 * SAP number otherwise.
218 */
219static int llc_ui_autoport(void)
220{
221 struct llc_sap *sap;
222 int i, tries = 0;
223
224 while (tries < LLC_SAP_DYN_TRIES) {
225 for (i = llc_ui_sap_last_autoport;
226 i < LLC_SAP_DYN_STOP; i += 2) {
227 sap = llc_sap_find(i);
228 if (!sap) {
229 llc_ui_sap_last_autoport = i + 2;
230 goto out;
231 }
Arnaldo Carvalho de Melo6e2144b2005-09-22 04:43:05 -0300232 llc_sap_put(sap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 }
234 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
235 tries++;
236 }
237 i = 0;
238out:
239 return i;
240}
241
242/**
Arnaldo Carvalho de Melo5a770c02005-09-22 03:56:26 -0300243 * llc_ui_autobind - automatically bind a socket to a sap
244 * @sock: socket to bind
245 * @addr: address to connect to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 *
Arnaldo Carvalho de Melo5a770c02005-09-22 03:56:26 -0300247 * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't
248 * specifically used llc_ui_bind to bind to an specific address/sap
249 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 * Returns: 0 upon success, negative otherwise.
251 */
252static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
253{
254 struct sock *sk = sock->sk;
255 struct llc_sock *llc = llc_sk(sk);
256 struct llc_sap *sap;
257 int rc = -EINVAL;
258
259 if (!sock_flag(sk, SOCK_ZAPPED))
260 goto out;
261 rc = -ENODEV;
Octavian Purdilaabf9d532009-12-26 11:51:01 +0000262 if (sk->sk_bound_dev_if) {
263 llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
264 if (llc->dev && addr->sllc_arphrd != llc->dev->type) {
265 dev_put(llc->dev);
266 llc->dev = NULL;
267 }
268 } else
269 llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 if (!llc->dev)
271 goto out;
272 rc = -EUSERS;
273 llc->laddr.lsap = llc_ui_autoport();
274 if (!llc->laddr.lsap)
275 goto out;
276 rc = -EBUSY; /* some other network layer is using the sap */
277 sap = llc_sap_open(llc->laddr.lsap, NULL);
278 if (!sap)
279 goto out;
280 memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN);
281 memcpy(&llc->addr, addr, sizeof(llc->addr));
282 /* assign new connection to its SAP */
283 llc_sap_add_socket(sap, sk);
284 sock_reset_flag(sk, SOCK_ZAPPED);
285 rc = 0;
286out:
287 return rc;
288}
289
290/**
291 * llc_ui_bind - bind a socket to a specific address.
292 * @sock: Socket to bind an address to.
293 * @uaddr: Address the user wants the socket bound to.
294 * @addrlen: Length of the uaddr structure.
295 *
296 * Bind a socket to a specific address. For llc a user is able to bind to
Arnaldo Carvalho de Melo5a770c02005-09-22 03:56:26 -0300297 * a specific sap only or mac + sap.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 * If the user desires to bind to a specific mac + sap, it is possible to
299 * have multiple sap connections via multiple macs.
300 * Bind and autobind for that matter must enforce the correct sap usage
301 * otherwise all hell will break loose.
302 * Returns: 0 upon success, negative otherwise.
303 */
304static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
305{
306 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
307 struct sock *sk = sock->sk;
308 struct llc_sock *llc = llc_sk(sk);
309 struct llc_sap *sap;
310 int rc = -EINVAL;
311
Harvey Harrison0dc47872008-03-05 20:47:47 -0800312 dprintk("%s: binding %02X\n", __func__, addr->sllc_sap);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300313 if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 goto out;
315 rc = -EAFNOSUPPORT;
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300316 if (unlikely(addr->sllc_family != AF_LLC))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 goto out;
Jochen Friedrichcf309e32005-09-22 04:44:55 -0300318 rc = -ENODEV;
319 rtnl_lock();
Octavian Purdilaabf9d532009-12-26 11:51:01 +0000320 if (sk->sk_bound_dev_if) {
321 llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
322 if (llc->dev) {
323 if (!addr->sllc_arphrd)
324 addr->sllc_arphrd = llc->dev->type;
325 if (llc_mac_null(addr->sllc_mac))
326 memcpy(addr->sllc_mac, llc->dev->dev_addr,
327 IFHWADDRLEN);
328 if (addr->sllc_arphrd != llc->dev->type ||
329 !llc_mac_match(addr->sllc_mac,
330 llc->dev->dev_addr)) {
331 rc = -EINVAL;
332 dev_put(llc->dev);
333 llc->dev = NULL;
334 }
335 }
336 } else
337 llc->dev = dev_getbyhwaddr(&init_net, addr->sllc_arphrd,
338 addr->sllc_mac);
Jochen Friedrichcf309e32005-09-22 04:44:55 -0300339 rtnl_unlock();
340 if (!llc->dev)
341 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 if (!addr->sllc_sap) {
343 rc = -EUSERS;
344 addr->sllc_sap = llc_ui_autoport();
345 if (!addr->sllc_sap)
346 goto out;
347 }
348 sap = llc_sap_find(addr->sllc_sap);
349 if (!sap) {
350 sap = llc_sap_open(addr->sllc_sap, NULL);
351 rc = -EBUSY; /* some other network layer is using the sap */
352 if (!sap)
353 goto out;
354 } else {
355 struct llc_addr laddr, daddr;
356 struct sock *ask;
357
358 memset(&laddr, 0, sizeof(laddr));
359 memset(&daddr, 0, sizeof(daddr));
360 /*
Michael Opdenacker59c51592007-05-09 08:57:56 +0200361 * FIXME: check if the address is multicast,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 * only SOCK_DGRAM can do this.
363 */
364 memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
365 laddr.lsap = addr->sllc_sap;
366 rc = -EADDRINUSE; /* mac + sap clash. */
367 ask = llc_lookup_established(sap, &daddr, &laddr);
368 if (ask) {
369 sock_put(ask);
Arnaldo Carvalho de Melo6e2144b2005-09-22 04:43:05 -0300370 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 }
372 }
373 llc->laddr.lsap = addr->sllc_sap;
374 memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN);
375 memcpy(&llc->addr, addr, sizeof(llc->addr));
376 /* assign new connection to its SAP */
377 llc_sap_add_socket(sap, sk);
378 sock_reset_flag(sk, SOCK_ZAPPED);
379 rc = 0;
Arnaldo Carvalho de Melo6e2144b2005-09-22 04:43:05 -0300380out_put:
381 llc_sap_put(sap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382out:
383 return rc;
384}
385
386/**
387 * llc_ui_shutdown - shutdown a connect llc2 socket.
388 * @sock: Socket to shutdown.
389 * @how: What part of the socket to shutdown.
390 *
391 * Shutdown a connected llc2 socket. Currently this function only supports
392 * shutting down both sends and receives (2), we could probably make this
393 * function such that a user can shutdown only half the connection but not
394 * right now.
395 * Returns: 0 upon success, negative otherwise.
396 */
397static int llc_ui_shutdown(struct socket *sock, int how)
398{
399 struct sock *sk = sock->sk;
400 int rc = -ENOTCONN;
401
402 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300403 if (unlikely(sk->sk_state != TCP_ESTABLISHED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 goto out;
405 rc = -EINVAL;
406 if (how != 2)
407 goto out;
408 rc = llc_send_disc(sk);
409 if (!rc)
410 rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
411 /* Wake up anyone sleeping in poll */
412 sk->sk_state_change(sk);
413out:
414 release_sock(sk);
415 return rc;
416}
417
418/**
419 * llc_ui_connect - Connect to a remote llc2 mac + sap.
420 * @sock: Socket which will be connected to the remote destination.
421 * @uaddr: Remote and possibly the local address of the new connection.
422 * @addrlen: Size of uaddr structure.
423 * @flags: Operational flags specified by the user.
424 *
425 * Connect to a remote llc2 mac + sap. The caller must specify the
426 * destination mac and address to connect to. If the user hasn't previously
427 * called bind(2) with a smac the address of the first interface of the
428 * specified arp type will be used.
429 * This function will autobind if user did not previously call bind.
430 * Returns: 0 upon success, negative otherwise.
431 */
432static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
433 int addrlen, int flags)
434{
435 struct sock *sk = sock->sk;
436 struct llc_sock *llc = llc_sk(sk);
437 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 int rc = -EINVAL;
439
440 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300441 if (unlikely(addrlen != sizeof(*addr)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 goto out;
443 rc = -EAFNOSUPPORT;
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300444 if (unlikely(addr->sllc_family != AF_LLC))
445 goto out;
446 if (unlikely(sk->sk_type != SOCK_STREAM))
447 goto out;
448 rc = -EALREADY;
449 if (unlikely(sock->state == SS_CONNECTING))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 goto out;
451 /* bind connection to sap if user hasn't done it. */
452 if (sock_flag(sk, SOCK_ZAPPED)) {
453 /* bind to sap with null dev, exclusive */
454 rc = llc_ui_autobind(sock, addr);
455 if (rc)
456 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 }
Jochen Friedrich5564af22005-09-22 04:46:44 -0300458 llc->daddr.lsap = addr->sllc_sap;
459 memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 sock->state = SS_CONNECTING;
461 sk->sk_state = TCP_SYN_SENT;
462 llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap);
Arnaldo Carvalho de Melo774ccb42005-09-22 03:53:35 -0300463 rc = llc_establish_connection(sk, llc->dev->dev_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 addr->sllc_mac, addr->sllc_sap);
465 if (rc) {
Harvey Harrison0dc47872008-03-05 20:47:47 -0800466 dprintk("%s: llc_ui_send_conn failed :-(\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 sock->state = SS_UNCONNECTED;
468 sk->sk_state = TCP_CLOSE;
469 goto out;
470 }
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300471
472 if (sk->sk_state == TCP_SYN_SENT) {
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300473 const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300474
475 if (!timeo || !llc_ui_wait_for_conn(sk, timeo))
476 goto out;
477
478 rc = sock_intr_errno(timeo);
479 if (signal_pending(current))
480 goto out;
481 }
482
483 if (sk->sk_state == TCP_CLOSE)
484 goto sock_error;
485
486 sock->state = SS_CONNECTED;
487 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488out:
489 release_sock(sk);
490 return rc;
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300491sock_error:
492 rc = sock_error(sk) ? : -ECONNABORTED;
493 sock->state = SS_UNCONNECTED;
494 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495}
496
497/**
498 * llc_ui_listen - allow a normal socket to accept incoming connections
499 * @sock: Socket to allow incoming connections on.
500 * @backlog: Number of connections to queue.
501 *
502 * Allow a normal socket to accept incoming connections.
503 * Returns 0 upon success, negative otherwise.
504 */
505static int llc_ui_listen(struct socket *sock, int backlog)
506{
507 struct sock *sk = sock->sk;
508 int rc = -EINVAL;
509
510 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300511 if (unlikely(sock->state != SS_UNCONNECTED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 goto out;
513 rc = -EOPNOTSUPP;
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300514 if (unlikely(sk->sk_type != SOCK_STREAM))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 goto out;
516 rc = -EAGAIN;
517 if (sock_flag(sk, SOCK_ZAPPED))
518 goto out;
519 rc = 0;
520 if (!(unsigned)backlog) /* BSDism */
521 backlog = 1;
522 sk->sk_max_ack_backlog = backlog;
523 if (sk->sk_state != TCP_LISTEN) {
524 sk->sk_ack_backlog = 0;
525 sk->sk_state = TCP_LISTEN;
526 }
527 sk->sk_socket->flags |= __SO_ACCEPTCON;
528out:
529 release_sock(sk);
530 return rc;
531}
532
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300533static int llc_ui_wait_for_disc(struct sock *sk, long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534{
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300535 DEFINE_WAIT(wait);
536 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300538 while (1) {
Eric Dumazetaa395142010-04-20 13:03:51 +0000539 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300540 if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE))
541 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 rc = -ERESTARTSYS;
543 if (signal_pending(current))
544 break;
545 rc = -EAGAIN;
546 if (!timeout)
547 break;
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300548 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 }
Eric Dumazetaa395142010-04-20 13:03:51 +0000550 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 return rc;
552}
553
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300554static int llc_ui_wait_for_conn(struct sock *sk, long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555{
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300556 DEFINE_WAIT(wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300558 while (1) {
Eric Dumazetaa395142010-04-20 13:03:51 +0000559 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300560 if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT))
561 break;
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300562 if (signal_pending(current) || !timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 }
Eric Dumazetaa395142010-04-20 13:03:51 +0000565 finish_wait(sk_sleep(sk), &wait);
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300566 return timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567}
568
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300569static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570{
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300571 DEFINE_WAIT(wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 struct llc_sock *llc = llc_sk(sk);
573 int rc;
574
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300575 while (1) {
Eric Dumazetaa395142010-04-20 13:03:51 +0000576 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 rc = 0;
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300578 if (sk_wait_event(sk, &timeout,
579 (sk->sk_shutdown & RCV_SHUTDOWN) ||
580 (!llc_data_accept_state(llc->state) &&
Jochen Friedrich451677c2005-11-14 21:57:46 -0800581 !llc->remote_busy_flag &&
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300582 !llc->p_flag)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 break;
584 rc = -ERESTARTSYS;
585 if (signal_pending(current))
586 break;
587 rc = -EAGAIN;
588 if (!timeout)
589 break;
590 }
Eric Dumazetaa395142010-04-20 13:03:51 +0000591 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 return rc;
593}
594
Arnaldo Carvalho de Melo2928c192005-09-22 05:14:33 -0300595static int llc_wait_data(struct sock *sk, long timeo)
Arnaldo Carvalho de Meloafdbe352005-09-22 04:37:07 -0300596{
597 int rc;
598
599 while (1) {
600 /*
601 * POSIX 1003.1g mandates this order.
602 */
Benjamin LaHaisec1cbe4b2005-12-13 23:22:19 -0800603 rc = sock_error(sk);
604 if (rc)
Arnaldo Carvalho de Meloafdbe352005-09-22 04:37:07 -0300605 break;
Arnaldo Carvalho de Meloafdbe352005-09-22 04:37:07 -0300606 rc = 0;
607 if (sk->sk_shutdown & RCV_SHUTDOWN)
608 break;
609 rc = -EAGAIN;
610 if (!timeo)
611 break;
612 rc = sock_intr_errno(timeo);
613 if (signal_pending(current))
614 break;
615 rc = 0;
616 if (sk_wait_data(sk, &timeo))
617 break;
618 }
619 return rc;
620}
621
Octavian Purdilae5cd6fe2009-12-26 11:51:00 +0000622static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb)
623{
624 struct llc_sock *llc = llc_sk(skb->sk);
625
626 if (llc->cmsg_flags & LLC_CMSG_PKTINFO) {
627 struct llc_pktinfo info;
628
629 info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex;
630 llc_pdu_decode_dsap(skb, &info.lpi_sap);
631 llc_pdu_decode_da(skb, info.lpi_mac);
632 put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info);
633 }
634}
635
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636/**
637 * llc_ui_accept - accept a new incoming connection.
638 * @sock: Socket which connections arrive on.
639 * @newsock: Socket to move incoming connection to.
640 * @flags: User specified operational flags.
641 *
642 * Accept a new incoming connection.
643 * Returns 0 upon success, negative otherwise.
644 */
645static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags)
646{
647 struct sock *sk = sock->sk, *newsk;
648 struct llc_sock *llc, *newllc;
649 struct sk_buff *skb;
650 int rc = -EOPNOTSUPP;
651
Harvey Harrison0dc47872008-03-05 20:47:47 -0800652 dprintk("%s: accepting on %02X\n", __func__,
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +0900653 llc_sk(sk)->laddr.lsap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300655 if (unlikely(sk->sk_type != SOCK_STREAM))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 goto out;
657 rc = -EINVAL;
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300658 if (unlikely(sock->state != SS_UNCONNECTED ||
659 sk->sk_state != TCP_LISTEN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 goto out;
661 /* wait for a connection to arrive. */
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300662 if (skb_queue_empty(&sk->sk_receive_queue)) {
Arnaldo Carvalho de Meloafdbe352005-09-22 04:37:07 -0300663 rc = llc_wait_data(sk, sk->sk_rcvtimeo);
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300664 if (rc)
665 goto out;
666 }
Harvey Harrison0dc47872008-03-05 20:47:47 -0800667 dprintk("%s: got a new connection on %02X\n", __func__,
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +0900668 llc_sk(sk)->laddr.lsap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 skb = skb_dequeue(&sk->sk_receive_queue);
670 rc = -EINVAL;
671 if (!skb->sk)
672 goto frees;
673 rc = 0;
674 newsk = skb->sk;
675 /* attach connection to a new socket. */
676 llc_ui_sk_init(newsock, newsk);
677 sock_reset_flag(newsk, SOCK_ZAPPED);
678 newsk->sk_state = TCP_ESTABLISHED;
679 newsock->state = SS_CONNECTED;
680 llc = llc_sk(sk);
681 newllc = llc_sk(newsk);
682 memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr));
683 newllc->link = llc_ui_next_link_no(newllc->laddr.lsap);
684
685 /* put original socket back into a clean listen state. */
686 sk->sk_state = TCP_LISTEN;
687 sk->sk_ack_backlog--;
Harvey Harrison0dc47872008-03-05 20:47:47 -0800688 dprintk("%s: ok success on %02X, client on %02X\n", __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
690frees:
691 kfree_skb(skb);
692out:
693 release_sock(sk);
694 return rc;
695}
696
697/**
698 * llc_ui_recvmsg - copy received data to the socket user.
699 * @sock: Socket to copy data from.
700 * @msg: Various user space related information.
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300701 * @len: Size of user buffer.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 * @flags: User specified flags.
703 *
704 * Copy received data to the socket user.
705 * Returns non-negative upon success, negative otherwise.
706 */
707static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock,
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300708 struct msghdr *msg, size_t len, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 struct sockaddr_llc *uaddr = (struct sockaddr_llc *)msg->msg_name;
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300711 const int nonblock = flags & MSG_DONTWAIT;
712 struct sk_buff *skb = NULL;
713 struct sock *sk = sock->sk;
714 struct llc_sock *llc = llc_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 size_t copied = 0;
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300716 u32 peek_seq = 0;
717 u32 *seq;
718 unsigned long used;
719 int target; /* Read at least this many bytes */
720 long timeo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 lock_sock(sk);
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300723 copied = -ENOTCONN;
Stephen Hemminger29efcd22006-05-25 15:08:59 -0700724 if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 goto out;
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300726
727 timeo = sock_rcvtimeo(sk, nonblock);
728
729 seq = &llc->copied_seq;
730 if (flags & MSG_PEEK) {
731 peek_seq = llc->copied_seq;
732 seq = &peek_seq;
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +0900733 }
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300734
735 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
736 copied = 0;
737
738 do {
739 u32 offset;
740
741 /*
742 * We need to check signals first, to get correct SIGURG
743 * handling. FIXME: Need to check this doesn't impact 1003.1g
744 * and move it down to the bottom of the loop
745 */
746 if (signal_pending(current)) {
747 if (copied)
748 break;
749 copied = timeo ? sock_intr_errno(timeo) : -EAGAIN;
750 break;
751 }
752
753 /* Next get a buffer. */
754
755 skb = skb_peek(&sk->sk_receive_queue);
756 if (skb) {
757 offset = *seq;
758 goto found_ok_skb;
759 }
760 /* Well, if we have backlog, try to process it now yet. */
761
762 if (copied >= target && !sk->sk_backlog.tail)
763 break;
764
765 if (copied) {
766 if (sk->sk_err ||
767 sk->sk_state == TCP_CLOSE ||
768 (sk->sk_shutdown & RCV_SHUTDOWN) ||
769 !timeo ||
770 (flags & MSG_PEEK))
771 break;
772 } else {
773 if (sock_flag(sk, SOCK_DONE))
774 break;
775
776 if (sk->sk_err) {
777 copied = sock_error(sk);
778 break;
779 }
780 if (sk->sk_shutdown & RCV_SHUTDOWN)
781 break;
782
Stephen Hemminger29efcd22006-05-25 15:08:59 -0700783 if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) {
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300784 if (!sock_flag(sk, SOCK_DONE)) {
785 /*
786 * This occurs when user tries to read
787 * from never connected socket.
788 */
789 copied = -ENOTCONN;
790 break;
791 }
792 break;
793 }
794 if (!timeo) {
795 copied = -EAGAIN;
796 break;
797 }
798 }
799
800 if (copied >= target) { /* Do not sleep, just process backlog. */
801 release_sock(sk);
802 lock_sock(sk);
803 } else
804 sk_wait_data(sk, &timeo);
805
806 if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) {
807 if (net_ratelimit())
808 printk(KERN_DEBUG "LLC(%s:%d): Application "
809 "bug, race in MSG_PEEK.\n",
Pavel Emelyanovba25f9d2007-10-18 23:40:40 -0700810 current->comm, task_pid_nr(current));
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300811 peek_seq = llc->copied_seq;
812 }
813 continue;
814 found_ok_skb:
815 /* Ok so how much can we use? */
816 used = skb->len - offset;
817 if (len < used)
818 used = len;
819
820 if (!(flags & MSG_TRUNC)) {
821 int rc = skb_copy_datagram_iovec(skb, offset,
822 msg->msg_iov, used);
823 if (rc) {
824 /* Exception. Bailout! */
825 if (!copied)
826 copied = -EFAULT;
827 break;
828 }
829 }
830
831 *seq += used;
832 copied += used;
833 len -= used;
834
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300835 if (!(flags & MSG_PEEK)) {
Chris Leech624d1162006-05-23 18:01:28 -0700836 sk_eat_skb(sk, skb, 0);
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300837 *seq = 0;
838 }
Stephen Hemminger30a584d2006-08-03 16:38:49 -0700839
840 /* For non stream protcols we get one packet per recvmsg call */
841 if (sk->sk_type != SOCK_STREAM)
842 goto copy_uaddr;
843
844 /* Partial read */
845 if (used + offset < skb->len)
846 continue;
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300847 } while (len > 0);
848
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849out:
850 release_sock(sk);
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300851 return copied;
852copy_uaddr:
853 if (uaddr != NULL && skb != NULL) {
854 memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
855 msg->msg_namelen = sizeof(*uaddr);
856 }
Octavian Purdilae5cd6fe2009-12-26 11:51:00 +0000857 if (llc_sk(sk)->cmsg_flags)
858 llc_cmsg_rcv(msg, skb);
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300859 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860}
861
862/**
863 * llc_ui_sendmsg - Transmit data provided by the socket user.
864 * @sock: Socket to transmit data from.
865 * @msg: Various user related information.
866 * @len: Length of data to transmit.
867 *
868 * Transmit data provided by the socket user.
869 * Returns non-negative upon success, negative otherwise.
870 */
871static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock,
872 struct msghdr *msg, size_t len)
873{
874 struct sock *sk = sock->sk;
875 struct llc_sock *llc = llc_sk(sk);
876 struct sockaddr_llc *addr = (struct sockaddr_llc *)msg->msg_name;
877 int flags = msg->msg_flags;
878 int noblock = flags & MSG_DONTWAIT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 struct sk_buff *skb;
880 size_t size = 0;
881 int rc = -EINVAL, copied = 0, hdrlen;
882
Harvey Harrison0dc47872008-03-05 20:47:47 -0800883 dprintk("%s: sending from %02X to %02X\n", __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 llc->laddr.lsap, llc->daddr.lsap);
885 lock_sock(sk);
886 if (addr) {
887 if (msg->msg_namelen < sizeof(*addr))
888 goto release;
889 } else {
890 if (llc_ui_addr_null(&llc->addr))
891 goto release;
892 addr = &llc->addr;
893 }
894 /* must bind connection to sap if user hasn't done it. */
895 if (sock_flag(sk, SOCK_ZAPPED)) {
896 /* bind to sap with null dev, exclusive. */
897 rc = llc_ui_autobind(sock, addr);
898 if (rc)
899 goto release;
900 }
Arnaldo Carvalho de Melo774ccb42005-09-22 03:53:35 -0300901 hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 size = hdrlen + len;
Arnaldo Carvalho de Melo774ccb42005-09-22 03:53:35 -0300903 if (size > llc->dev->mtu)
904 size = llc->dev->mtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 copied = size - hdrlen;
906 release_sock(sk);
907 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
908 lock_sock(sk);
909 if (!skb)
910 goto release;
Arnaldo Carvalho de Melo774ccb42005-09-22 03:53:35 -0300911 skb->dev = llc->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 skb->protocol = llc_proto_type(addr->sllc_arphrd);
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +0900913 skb_reserve(skb, hdrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 rc = memcpy_fromiovec(skb_put(skb, copied), msg->msg_iov, copied);
915 if (rc)
916 goto out;
917 if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) {
918 llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac,
919 addr->sllc_sap);
920 goto out;
921 }
922 if (addr->sllc_test) {
923 llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
924 addr->sllc_sap);
925 goto out;
926 }
927 if (addr->sllc_xid) {
928 llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
929 addr->sllc_sap);
930 goto out;
931 }
932 rc = -ENOPROTOOPT;
933 if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
934 goto out;
935 rc = llc_ui_send_data(sk, skb, noblock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936out:
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300937 if (rc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 kfree_skb(skb);
939release:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 dprintk("%s: failed sending from %02X to %02X: %d\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800941 __func__, llc->laddr.lsap, llc->daddr.lsap, rc);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300942 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 release_sock(sk);
944 return rc ? : copied;
945}
946
947/**
948 * llc_ui_getname - return the address info of a socket
949 * @sock: Socket to get address of.
950 * @uaddr: Address structure to return information.
951 * @uaddrlen: Length of address structure.
952 * @peer: Does user want local or remote address information.
953 *
954 * Return the address information of a socket.
955 */
956static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
957 int *uaddrlen, int peer)
958{
959 struct sockaddr_llc sllc;
960 struct sock *sk = sock->sk;
961 struct llc_sock *llc = llc_sk(sk);
962 int rc = 0;
963
Jiri Slaby28e9fc52009-08-23 22:55:51 -0700964 memset(&sllc, 0, sizeof(sllc));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 lock_sock(sk);
966 if (sock_flag(sk, SOCK_ZAPPED))
967 goto out;
968 *uaddrlen = sizeof(sllc);
969 memset(uaddr, 0, *uaddrlen);
970 if (peer) {
971 rc = -ENOTCONN;
972 if (sk->sk_state != TCP_ESTABLISHED)
973 goto out;
974 if(llc->dev)
975 sllc.sllc_arphrd = llc->dev->type;
976 sllc.sllc_sap = llc->daddr.lsap;
977 memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
978 } else {
979 rc = -EINVAL;
980 if (!llc->sap)
981 goto out;
982 sllc.sllc_sap = llc->sap->laddr.lsap;
983
984 if (llc->dev) {
985 sllc.sllc_arphrd = llc->dev->type;
Jiri Pirkoa186d2a2009-05-12 22:40:12 +0000986 memcpy(&sllc.sllc_mac, llc->dev->dev_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 IFHWADDRLEN);
988 }
989 }
990 rc = 0;
991 sllc.sllc_family = AF_LLC;
992 memcpy(uaddr, &sllc, sizeof(sllc));
993out:
994 release_sock(sk);
995 return rc;
996}
997
998/**
999 * llc_ui_ioctl - io controls for PF_LLC
1000 * @sock: Socket to get/set info
1001 * @cmd: command
1002 * @arg: optional argument for cmd
1003 *
1004 * get/set info on llc sockets
1005 */
1006static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
1007 unsigned long arg)
1008{
Christoph Hellwigb5e5fa52006-01-03 14:18:33 -08001009 return -ENOIOCTLCMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010}
1011
1012/**
1013 * llc_ui_setsockopt - set various connection specific parameters.
1014 * @sock: Socket to set options on.
1015 * @level: Socket level user is requesting operations on.
1016 * @optname: Operation name.
1017 * @optval User provided operation data.
1018 * @optlen: Length of optval.
1019 *
1020 * Set various connection specific parameters.
1021 */
1022static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001023 char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024{
1025 struct sock *sk = sock->sk;
1026 struct llc_sock *llc = llc_sk(sk);
Dan Carpenter339db112010-09-10 01:56:16 +00001027 unsigned int opt;
1028 int rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029
1030 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -03001031 if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 goto out;
1033 rc = get_user(opt, (int __user *)optval);
1034 if (rc)
1035 goto out;
1036 rc = -EINVAL;
1037 switch (optname) {
1038 case LLC_OPT_RETRY:
1039 if (opt > LLC_OPT_MAX_RETRY)
1040 goto out;
1041 llc->n2 = opt;
1042 break;
1043 case LLC_OPT_SIZE:
1044 if (opt > LLC_OPT_MAX_SIZE)
1045 goto out;
1046 llc->n1 = opt;
1047 break;
1048 case LLC_OPT_ACK_TMR_EXP:
1049 if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
1050 goto out;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001051 llc->ack_timer.expire = opt * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 break;
1053 case LLC_OPT_P_TMR_EXP:
1054 if (opt > LLC_OPT_MAX_P_TMR_EXP)
1055 goto out;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001056 llc->pf_cycle_timer.expire = opt * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 break;
1058 case LLC_OPT_REJ_TMR_EXP:
1059 if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
1060 goto out;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001061 llc->rej_sent_timer.expire = opt * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 break;
1063 case LLC_OPT_BUSY_TMR_EXP:
1064 if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
1065 goto out;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001066 llc->busy_state_timer.expire = opt * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 break;
1068 case LLC_OPT_TX_WIN:
1069 if (opt > LLC_OPT_MAX_WIN)
1070 goto out;
1071 llc->k = opt;
1072 break;
1073 case LLC_OPT_RX_WIN:
1074 if (opt > LLC_OPT_MAX_WIN)
1075 goto out;
1076 llc->rw = opt;
1077 break;
Octavian Purdilae5cd6fe2009-12-26 11:51:00 +00001078 case LLC_OPT_PKTINFO:
1079 if (opt)
1080 llc->cmsg_flags |= LLC_CMSG_PKTINFO;
1081 else
1082 llc->cmsg_flags &= ~LLC_CMSG_PKTINFO;
1083 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 default:
1085 rc = -ENOPROTOOPT;
1086 goto out;
1087 }
1088 rc = 0;
1089out:
1090 release_sock(sk);
1091 return rc;
1092}
1093
1094/**
1095 * llc_ui_getsockopt - get connection specific socket info
1096 * @sock: Socket to get information from.
1097 * @level: Socket level user is requesting operations on.
1098 * @optname: Operation name.
1099 * @optval: Variable to return operation data in.
1100 * @optlen: Length of optval.
1101 *
1102 * Get connection specific socket information.
1103 */
1104static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
1105 char __user *optval, int __user *optlen)
1106{
1107 struct sock *sk = sock->sk;
1108 struct llc_sock *llc = llc_sk(sk);
1109 int val = 0, len = 0, rc = -EINVAL;
1110
1111 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -03001112 if (unlikely(level != SOL_LLC))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 goto out;
1114 rc = get_user(len, optlen);
1115 if (rc)
1116 goto out;
1117 rc = -EINVAL;
1118 if (len != sizeof(int))
1119 goto out;
1120 switch (optname) {
1121 case LLC_OPT_RETRY:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001122 val = llc->n2; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 case LLC_OPT_SIZE:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001124 val = llc->n1; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 case LLC_OPT_ACK_TMR_EXP:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001126 val = llc->ack_timer.expire / HZ; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127 case LLC_OPT_P_TMR_EXP:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001128 val = llc->pf_cycle_timer.expire / HZ; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 case LLC_OPT_REJ_TMR_EXP:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001130 val = llc->rej_sent_timer.expire / HZ; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 case LLC_OPT_BUSY_TMR_EXP:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001132 val = llc->busy_state_timer.expire / HZ; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 case LLC_OPT_TX_WIN:
1134 val = llc->k; break;
1135 case LLC_OPT_RX_WIN:
1136 val = llc->rw; break;
Octavian Purdilae5cd6fe2009-12-26 11:51:00 +00001137 case LLC_OPT_PKTINFO:
1138 val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0;
1139 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 default:
1141 rc = -ENOPROTOOPT;
1142 goto out;
1143 }
1144 rc = 0;
1145 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
1146 rc = -EFAULT;
1147out:
1148 release_sock(sk);
1149 return rc;
1150}
1151
Stephen Hemmingerec1b4cf2009-10-05 05:58:39 +00001152static const struct net_proto_family llc_ui_family_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 .family = PF_LLC,
1154 .create = llc_ui_create,
1155 .owner = THIS_MODULE,
1156};
1157
Eric Dumazet90ddc4f2005-12-22 12:49:22 -08001158static const struct proto_ops llc_ui_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 .family = PF_LLC,
1160 .owner = THIS_MODULE,
1161 .release = llc_ui_release,
1162 .bind = llc_ui_bind,
1163 .connect = llc_ui_connect,
1164 .socketpair = sock_no_socketpair,
1165 .accept = llc_ui_accept,
1166 .getname = llc_ui_getname,
1167 .poll = datagram_poll,
1168 .ioctl = llc_ui_ioctl,
1169 .listen = llc_ui_listen,
1170 .shutdown = llc_ui_shutdown,
1171 .setsockopt = llc_ui_setsockopt,
1172 .getsockopt = llc_ui_getsockopt,
1173 .sendmsg = llc_ui_sendmsg,
1174 .recvmsg = llc_ui_recvmsg,
1175 .mmap = sock_no_mmap,
1176 .sendpage = sock_no_sendpage,
1177};
1178
Stephen Hemminger01af4a02009-02-22 00:02:44 -08001179static const char llc_proc_err_msg[] __initconst =
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +09001180 KERN_CRIT "LLC: Unable to register the proc_fs entries\n";
Stephen Hemminger01af4a02009-02-22 00:02:44 -08001181static const char llc_sysctl_err_msg[] __initconst =
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +09001182 KERN_CRIT "LLC: Unable to register the sysctl entries\n";
Stephen Hemminger01af4a02009-02-22 00:02:44 -08001183static const char llc_sock_err_msg[] __initconst =
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +09001184 KERN_CRIT "LLC: Unable to register the network family\n";
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001185
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186static int __init llc2_init(void)
1187{
1188 int rc = proto_register(&llc_proto, 0);
1189
1190 if (rc != 0)
1191 goto out;
1192
1193 llc_build_offset_table();
1194 llc_station_init();
1195 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
1196 rc = llc_proc_init();
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001197 if (rc != 0) {
1198 printk(llc_proc_err_msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 goto out_unregister_llc_proto;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001200 }
1201 rc = llc_sysctl_init();
1202 if (rc) {
1203 printk(llc_sysctl_err_msg);
1204 goto out_proc;
1205 }
1206 rc = sock_register(&llc_ui_family_ops);
1207 if (rc) {
1208 printk(llc_sock_err_msg);
1209 goto out_sysctl;
1210 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
1212 llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
1213out:
1214 return rc;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001215out_sysctl:
1216 llc_sysctl_exit();
1217out_proc:
1218 llc_proc_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219out_unregister_llc_proto:
1220 proto_unregister(&llc_proto);
1221 goto out;
1222}
1223
1224static void __exit llc2_exit(void)
1225{
1226 llc_station_exit();
1227 llc_remove_pack(LLC_DEST_SAP);
1228 llc_remove_pack(LLC_DEST_CONN);
1229 sock_unregister(PF_LLC);
1230 llc_proc_exit();
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001231 llc_sysctl_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 proto_unregister(&llc_proto);
1233}
1234
1235module_init(llc2_init);
1236module_exit(llc2_exit);
1237
1238MODULE_LICENSE("GPL");
1239MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1240MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1241MODULE_ALIAS_NETPROTO(PF_LLC);