blob: b9bef2c750267cfd0adeaf918c1cc5503461d3db [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;
Eric Dumazet941666c2010-12-05 01:23:53 +0000319 rcu_read_lock();
Octavian Purdilaabf9d532009-12-26 11:51:01 +0000320 if (sk->sk_bound_dev_if) {
Eric Dumazet941666c2010-12-05 01:23:53 +0000321 llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if);
Octavian Purdilaabf9d532009-12-26 11:51:01 +0000322 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;
Octavian Purdilaabf9d532009-12-26 11:51:01 +0000332 llc->dev = NULL;
333 }
334 }
335 } else
Eric Dumazet941666c2010-12-05 01:23:53 +0000336 llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd,
Octavian Purdilaabf9d532009-12-26 11:51:01 +0000337 addr->sllc_mac);
Eric Dumazet941666c2010-12-05 01:23:53 +0000338 if (llc->dev)
339 dev_hold(llc->dev);
340 rcu_read_unlock();
Jochen Friedrichcf309e32005-09-22 04:44:55 -0300341 if (!llc->dev)
342 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 if (!addr->sllc_sap) {
344 rc = -EUSERS;
345 addr->sllc_sap = llc_ui_autoport();
346 if (!addr->sllc_sap)
347 goto out;
348 }
349 sap = llc_sap_find(addr->sllc_sap);
350 if (!sap) {
351 sap = llc_sap_open(addr->sllc_sap, NULL);
352 rc = -EBUSY; /* some other network layer is using the sap */
353 if (!sap)
354 goto out;
355 } else {
356 struct llc_addr laddr, daddr;
357 struct sock *ask;
358
359 memset(&laddr, 0, sizeof(laddr));
360 memset(&daddr, 0, sizeof(daddr));
361 /*
Michael Opdenacker59c51592007-05-09 08:57:56 +0200362 * FIXME: check if the address is multicast,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 * only SOCK_DGRAM can do this.
364 */
365 memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
366 laddr.lsap = addr->sllc_sap;
367 rc = -EADDRINUSE; /* mac + sap clash. */
368 ask = llc_lookup_established(sap, &daddr, &laddr);
369 if (ask) {
370 sock_put(ask);
Arnaldo Carvalho de Melo6e2144b2005-09-22 04:43:05 -0300371 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 }
373 }
374 llc->laddr.lsap = addr->sllc_sap;
375 memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN);
376 memcpy(&llc->addr, addr, sizeof(llc->addr));
377 /* assign new connection to its SAP */
378 llc_sap_add_socket(sap, sk);
379 sock_reset_flag(sk, SOCK_ZAPPED);
380 rc = 0;
Arnaldo Carvalho de Melo6e2144b2005-09-22 04:43:05 -0300381out_put:
382 llc_sap_put(sap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383out:
384 return rc;
385}
386
387/**
388 * llc_ui_shutdown - shutdown a connect llc2 socket.
389 * @sock: Socket to shutdown.
390 * @how: What part of the socket to shutdown.
391 *
392 * Shutdown a connected llc2 socket. Currently this function only supports
393 * shutting down both sends and receives (2), we could probably make this
394 * function such that a user can shutdown only half the connection but not
395 * right now.
396 * Returns: 0 upon success, negative otherwise.
397 */
398static int llc_ui_shutdown(struct socket *sock, int how)
399{
400 struct sock *sk = sock->sk;
401 int rc = -ENOTCONN;
402
403 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300404 if (unlikely(sk->sk_state != TCP_ESTABLISHED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 goto out;
406 rc = -EINVAL;
407 if (how != 2)
408 goto out;
409 rc = llc_send_disc(sk);
410 if (!rc)
411 rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
412 /* Wake up anyone sleeping in poll */
413 sk->sk_state_change(sk);
414out:
415 release_sock(sk);
416 return rc;
417}
418
419/**
420 * llc_ui_connect - Connect to a remote llc2 mac + sap.
421 * @sock: Socket which will be connected to the remote destination.
422 * @uaddr: Remote and possibly the local address of the new connection.
423 * @addrlen: Size of uaddr structure.
424 * @flags: Operational flags specified by the user.
425 *
426 * Connect to a remote llc2 mac + sap. The caller must specify the
427 * destination mac and address to connect to. If the user hasn't previously
428 * called bind(2) with a smac the address of the first interface of the
429 * specified arp type will be used.
430 * This function will autobind if user did not previously call bind.
431 * Returns: 0 upon success, negative otherwise.
432 */
433static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
434 int addrlen, int flags)
435{
436 struct sock *sk = sock->sk;
437 struct llc_sock *llc = llc_sk(sk);
438 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 int rc = -EINVAL;
440
441 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300442 if (unlikely(addrlen != sizeof(*addr)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 goto out;
444 rc = -EAFNOSUPPORT;
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300445 if (unlikely(addr->sllc_family != AF_LLC))
446 goto out;
447 if (unlikely(sk->sk_type != SOCK_STREAM))
448 goto out;
449 rc = -EALREADY;
450 if (unlikely(sock->state == SS_CONNECTING))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 goto out;
452 /* bind connection to sap if user hasn't done it. */
453 if (sock_flag(sk, SOCK_ZAPPED)) {
454 /* bind to sap with null dev, exclusive */
455 rc = llc_ui_autobind(sock, addr);
456 if (rc)
457 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 }
Jochen Friedrich5564af22005-09-22 04:46:44 -0300459 llc->daddr.lsap = addr->sllc_sap;
460 memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 sock->state = SS_CONNECTING;
462 sk->sk_state = TCP_SYN_SENT;
463 llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap);
Arnaldo Carvalho de Melo774ccb42005-09-22 03:53:35 -0300464 rc = llc_establish_connection(sk, llc->dev->dev_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 addr->sllc_mac, addr->sllc_sap);
466 if (rc) {
Harvey Harrison0dc47872008-03-05 20:47:47 -0800467 dprintk("%s: llc_ui_send_conn failed :-(\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 sock->state = SS_UNCONNECTED;
469 sk->sk_state = TCP_CLOSE;
470 goto out;
471 }
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300472
473 if (sk->sk_state == TCP_SYN_SENT) {
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300474 const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300475
476 if (!timeo || !llc_ui_wait_for_conn(sk, timeo))
477 goto out;
478
479 rc = sock_intr_errno(timeo);
480 if (signal_pending(current))
481 goto out;
482 }
483
484 if (sk->sk_state == TCP_CLOSE)
485 goto sock_error;
486
487 sock->state = SS_CONNECTED;
488 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489out:
490 release_sock(sk);
491 return rc;
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300492sock_error:
493 rc = sock_error(sk) ? : -ECONNABORTED;
494 sock->state = SS_UNCONNECTED;
495 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496}
497
498/**
499 * llc_ui_listen - allow a normal socket to accept incoming connections
500 * @sock: Socket to allow incoming connections on.
501 * @backlog: Number of connections to queue.
502 *
503 * Allow a normal socket to accept incoming connections.
504 * Returns 0 upon success, negative otherwise.
505 */
506static int llc_ui_listen(struct socket *sock, int backlog)
507{
508 struct sock *sk = sock->sk;
509 int rc = -EINVAL;
510
511 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300512 if (unlikely(sock->state != SS_UNCONNECTED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 goto out;
514 rc = -EOPNOTSUPP;
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300515 if (unlikely(sk->sk_type != SOCK_STREAM))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 goto out;
517 rc = -EAGAIN;
518 if (sock_flag(sk, SOCK_ZAPPED))
519 goto out;
520 rc = 0;
521 if (!(unsigned)backlog) /* BSDism */
522 backlog = 1;
523 sk->sk_max_ack_backlog = backlog;
524 if (sk->sk_state != TCP_LISTEN) {
525 sk->sk_ack_backlog = 0;
526 sk->sk_state = TCP_LISTEN;
527 }
528 sk->sk_socket->flags |= __SO_ACCEPTCON;
529out:
530 release_sock(sk);
531 return rc;
532}
533
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300534static int llc_ui_wait_for_disc(struct sock *sk, long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535{
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300536 DEFINE_WAIT(wait);
537 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300539 while (1) {
Eric Dumazetaa395142010-04-20 13:03:51 +0000540 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300541 if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE))
542 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 rc = -ERESTARTSYS;
544 if (signal_pending(current))
545 break;
546 rc = -EAGAIN;
547 if (!timeout)
548 break;
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300549 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 }
Eric Dumazetaa395142010-04-20 13:03:51 +0000551 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 return rc;
553}
554
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300555static int llc_ui_wait_for_conn(struct sock *sk, long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556{
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300557 DEFINE_WAIT(wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300559 while (1) {
Eric Dumazetaa395142010-04-20 13:03:51 +0000560 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300561 if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT))
562 break;
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300563 if (signal_pending(current) || !timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 }
Eric Dumazetaa395142010-04-20 13:03:51 +0000566 finish_wait(sk_sleep(sk), &wait);
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300567 return timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568}
569
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300570static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571{
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300572 DEFINE_WAIT(wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 struct llc_sock *llc = llc_sk(sk);
574 int rc;
575
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300576 while (1) {
Eric Dumazetaa395142010-04-20 13:03:51 +0000577 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 rc = 0;
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300579 if (sk_wait_event(sk, &timeout,
580 (sk->sk_shutdown & RCV_SHUTDOWN) ||
581 (!llc_data_accept_state(llc->state) &&
Jochen Friedrich451677c2005-11-14 21:57:46 -0800582 !llc->remote_busy_flag &&
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300583 !llc->p_flag)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 break;
585 rc = -ERESTARTSYS;
586 if (signal_pending(current))
587 break;
588 rc = -EAGAIN;
589 if (!timeout)
590 break;
591 }
Eric Dumazetaa395142010-04-20 13:03:51 +0000592 finish_wait(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 return rc;
594}
595
Arnaldo Carvalho de Melo2928c192005-09-22 05:14:33 -0300596static int llc_wait_data(struct sock *sk, long timeo)
Arnaldo Carvalho de Meloafdbe352005-09-22 04:37:07 -0300597{
598 int rc;
599
600 while (1) {
601 /*
602 * POSIX 1003.1g mandates this order.
603 */
Benjamin LaHaisec1cbe4b2005-12-13 23:22:19 -0800604 rc = sock_error(sk);
605 if (rc)
Arnaldo Carvalho de Meloafdbe352005-09-22 04:37:07 -0300606 break;
Arnaldo Carvalho de Meloafdbe352005-09-22 04:37:07 -0300607 rc = 0;
608 if (sk->sk_shutdown & RCV_SHUTDOWN)
609 break;
610 rc = -EAGAIN;
611 if (!timeo)
612 break;
613 rc = sock_intr_errno(timeo);
614 if (signal_pending(current))
615 break;
616 rc = 0;
617 if (sk_wait_data(sk, &timeo))
618 break;
619 }
620 return rc;
621}
622
Octavian Purdilae5cd6fe2009-12-26 11:51:00 +0000623static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb)
624{
625 struct llc_sock *llc = llc_sk(skb->sk);
626
627 if (llc->cmsg_flags & LLC_CMSG_PKTINFO) {
628 struct llc_pktinfo info;
629
630 info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex;
631 llc_pdu_decode_dsap(skb, &info.lpi_sap);
632 llc_pdu_decode_da(skb, info.lpi_mac);
633 put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info);
634 }
635}
636
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637/**
638 * llc_ui_accept - accept a new incoming connection.
639 * @sock: Socket which connections arrive on.
640 * @newsock: Socket to move incoming connection to.
641 * @flags: User specified operational flags.
642 *
643 * Accept a new incoming connection.
644 * Returns 0 upon success, negative otherwise.
645 */
646static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags)
647{
648 struct sock *sk = sock->sk, *newsk;
649 struct llc_sock *llc, *newllc;
650 struct sk_buff *skb;
651 int rc = -EOPNOTSUPP;
652
Harvey Harrison0dc47872008-03-05 20:47:47 -0800653 dprintk("%s: accepting on %02X\n", __func__,
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +0900654 llc_sk(sk)->laddr.lsap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300656 if (unlikely(sk->sk_type != SOCK_STREAM))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 goto out;
658 rc = -EINVAL;
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300659 if (unlikely(sock->state != SS_UNCONNECTED ||
660 sk->sk_state != TCP_LISTEN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 goto out;
662 /* wait for a connection to arrive. */
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300663 if (skb_queue_empty(&sk->sk_receive_queue)) {
Arnaldo Carvalho de Meloafdbe352005-09-22 04:37:07 -0300664 rc = llc_wait_data(sk, sk->sk_rcvtimeo);
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300665 if (rc)
666 goto out;
667 }
Harvey Harrison0dc47872008-03-05 20:47:47 -0800668 dprintk("%s: got a new connection on %02X\n", __func__,
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +0900669 llc_sk(sk)->laddr.lsap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 skb = skb_dequeue(&sk->sk_receive_queue);
671 rc = -EINVAL;
672 if (!skb->sk)
673 goto frees;
674 rc = 0;
675 newsk = skb->sk;
676 /* attach connection to a new socket. */
677 llc_ui_sk_init(newsock, newsk);
678 sock_reset_flag(newsk, SOCK_ZAPPED);
679 newsk->sk_state = TCP_ESTABLISHED;
680 newsock->state = SS_CONNECTED;
681 llc = llc_sk(sk);
682 newllc = llc_sk(newsk);
683 memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr));
684 newllc->link = llc_ui_next_link_no(newllc->laddr.lsap);
685
686 /* put original socket back into a clean listen state. */
687 sk->sk_state = TCP_LISTEN;
688 sk->sk_ack_backlog--;
Harvey Harrison0dc47872008-03-05 20:47:47 -0800689 dprintk("%s: ok success on %02X, client on %02X\n", __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
691frees:
692 kfree_skb(skb);
693out:
694 release_sock(sk);
695 return rc;
696}
697
698/**
699 * llc_ui_recvmsg - copy received data to the socket user.
700 * @sock: Socket to copy data from.
701 * @msg: Various user space related information.
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300702 * @len: Size of user buffer.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 * @flags: User specified flags.
704 *
705 * Copy received data to the socket user.
706 * Returns non-negative upon success, negative otherwise.
707 */
708static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock,
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300709 struct msghdr *msg, size_t len, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 struct sockaddr_llc *uaddr = (struct sockaddr_llc *)msg->msg_name;
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300712 const int nonblock = flags & MSG_DONTWAIT;
713 struct sk_buff *skb = NULL;
714 struct sock *sk = sock->sk;
715 struct llc_sock *llc = llc_sk(sk);
Radu Iliescu56ac11c2012-01-19 03:57:57 +0000716 unsigned long cpu_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 size_t copied = 0;
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300718 u32 peek_seq = 0;
719 u32 *seq;
720 unsigned long used;
721 int target; /* Read at least this many bytes */
722 long timeo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 lock_sock(sk);
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300725 copied = -ENOTCONN;
Stephen Hemminger29efcd22006-05-25 15:08:59 -0700726 if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 goto out;
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300728
729 timeo = sock_rcvtimeo(sk, nonblock);
730
731 seq = &llc->copied_seq;
732 if (flags & MSG_PEEK) {
733 peek_seq = llc->copied_seq;
734 seq = &peek_seq;
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +0900735 }
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300736
737 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
738 copied = 0;
739
740 do {
741 u32 offset;
742
743 /*
744 * We need to check signals first, to get correct SIGURG
745 * handling. FIXME: Need to check this doesn't impact 1003.1g
746 * and move it down to the bottom of the loop
747 */
748 if (signal_pending(current)) {
749 if (copied)
750 break;
751 copied = timeo ? sock_intr_errno(timeo) : -EAGAIN;
752 break;
753 }
754
755 /* Next get a buffer. */
756
757 skb = skb_peek(&sk->sk_receive_queue);
758 if (skb) {
759 offset = *seq;
760 goto found_ok_skb;
761 }
762 /* Well, if we have backlog, try to process it now yet. */
763
764 if (copied >= target && !sk->sk_backlog.tail)
765 break;
766
767 if (copied) {
768 if (sk->sk_err ||
769 sk->sk_state == TCP_CLOSE ||
770 (sk->sk_shutdown & RCV_SHUTDOWN) ||
771 !timeo ||
772 (flags & MSG_PEEK))
773 break;
774 } else {
775 if (sock_flag(sk, SOCK_DONE))
776 break;
777
778 if (sk->sk_err) {
779 copied = sock_error(sk);
780 break;
781 }
782 if (sk->sk_shutdown & RCV_SHUTDOWN)
783 break;
784
Stephen Hemminger29efcd22006-05-25 15:08:59 -0700785 if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) {
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300786 if (!sock_flag(sk, SOCK_DONE)) {
787 /*
788 * This occurs when user tries to read
789 * from never connected socket.
790 */
791 copied = -ENOTCONN;
792 break;
793 }
794 break;
795 }
796 if (!timeo) {
797 copied = -EAGAIN;
798 break;
799 }
800 }
801
802 if (copied >= target) { /* Do not sleep, just process backlog. */
803 release_sock(sk);
804 lock_sock(sk);
805 } else
806 sk_wait_data(sk, &timeo);
807
808 if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) {
809 if (net_ratelimit())
810 printk(KERN_DEBUG "LLC(%s:%d): Application "
811 "bug, race in MSG_PEEK.\n",
Pavel Emelyanovba25f9d2007-10-18 23:40:40 -0700812 current->comm, task_pid_nr(current));
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300813 peek_seq = llc->copied_seq;
814 }
815 continue;
816 found_ok_skb:
817 /* Ok so how much can we use? */
818 used = skb->len - offset;
819 if (len < used)
820 used = len;
821
822 if (!(flags & MSG_TRUNC)) {
823 int rc = skb_copy_datagram_iovec(skb, offset,
824 msg->msg_iov, used);
825 if (rc) {
826 /* Exception. Bailout! */
827 if (!copied)
828 copied = -EFAULT;
829 break;
830 }
831 }
832
833 *seq += used;
834 copied += used;
835 len -= used;
836
Alex Juncu9cef3102011-12-15 23:01:25 +0000837 /* For non stream protcols we get one packet per recvmsg call */
838 if (sk->sk_type != SOCK_STREAM)
839 goto copy_uaddr;
840
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300841 if (!(flags & MSG_PEEK)) {
Radu Iliescu56ac11c2012-01-19 03:57:57 +0000842 spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags);
Chris Leech624d1162006-05-23 18:01:28 -0700843 sk_eat_skb(sk, skb, 0);
Radu Iliescu56ac11c2012-01-19 03:57:57 +0000844 spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags);
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300845 *seq = 0;
846 }
Stephen Hemminger30a584d2006-08-03 16:38:49 -0700847
Stephen Hemminger30a584d2006-08-03 16:38:49 -0700848 /* Partial read */
849 if (used + offset < skb->len)
850 continue;
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300851 } while (len > 0);
852
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853out:
854 release_sock(sk);
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300855 return copied;
856copy_uaddr:
857 if (uaddr != NULL && skb != NULL) {
858 memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
859 msg->msg_namelen = sizeof(*uaddr);
860 }
Octavian Purdilae5cd6fe2009-12-26 11:51:00 +0000861 if (llc_sk(sk)->cmsg_flags)
862 llc_cmsg_rcv(msg, skb);
Alex Juncu9cef3102011-12-15 23:01:25 +0000863
864 if (!(flags & MSG_PEEK)) {
Radu Iliescu56ac11c2012-01-19 03:57:57 +0000865 spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags);
Alex Juncu9cef3102011-12-15 23:01:25 +0000866 sk_eat_skb(sk, skb, 0);
Radu Iliescu56ac11c2012-01-19 03:57:57 +0000867 spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags);
Alex Juncu9cef3102011-12-15 23:01:25 +0000868 *seq = 0;
869 }
870
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300871 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872}
873
874/**
875 * llc_ui_sendmsg - Transmit data provided by the socket user.
876 * @sock: Socket to transmit data from.
877 * @msg: Various user related information.
878 * @len: Length of data to transmit.
879 *
880 * Transmit data provided by the socket user.
881 * Returns non-negative upon success, negative otherwise.
882 */
883static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock,
884 struct msghdr *msg, size_t len)
885{
886 struct sock *sk = sock->sk;
887 struct llc_sock *llc = llc_sk(sk);
888 struct sockaddr_llc *addr = (struct sockaddr_llc *)msg->msg_name;
889 int flags = msg->msg_flags;
890 int noblock = flags & MSG_DONTWAIT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 struct sk_buff *skb;
892 size_t size = 0;
893 int rc = -EINVAL, copied = 0, hdrlen;
894
Harvey Harrison0dc47872008-03-05 20:47:47 -0800895 dprintk("%s: sending from %02X to %02X\n", __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 llc->laddr.lsap, llc->daddr.lsap);
897 lock_sock(sk);
898 if (addr) {
899 if (msg->msg_namelen < sizeof(*addr))
900 goto release;
901 } else {
902 if (llc_ui_addr_null(&llc->addr))
903 goto release;
904 addr = &llc->addr;
905 }
906 /* must bind connection to sap if user hasn't done it. */
907 if (sock_flag(sk, SOCK_ZAPPED)) {
908 /* bind to sap with null dev, exclusive. */
909 rc = llc_ui_autobind(sock, addr);
910 if (rc)
911 goto release;
912 }
Arnaldo Carvalho de Melo774ccb42005-09-22 03:53:35 -0300913 hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 size = hdrlen + len;
Arnaldo Carvalho de Melo774ccb42005-09-22 03:53:35 -0300915 if (size > llc->dev->mtu)
916 size = llc->dev->mtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 copied = size - hdrlen;
918 release_sock(sk);
919 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
920 lock_sock(sk);
921 if (!skb)
922 goto release;
Arnaldo Carvalho de Melo774ccb42005-09-22 03:53:35 -0300923 skb->dev = llc->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 skb->protocol = llc_proto_type(addr->sllc_arphrd);
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +0900925 skb_reserve(skb, hdrlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 rc = memcpy_fromiovec(skb_put(skb, copied), msg->msg_iov, copied);
927 if (rc)
928 goto out;
929 if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) {
930 llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac,
931 addr->sllc_sap);
932 goto out;
933 }
934 if (addr->sllc_test) {
935 llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
936 addr->sllc_sap);
937 goto out;
938 }
939 if (addr->sllc_xid) {
940 llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
941 addr->sllc_sap);
942 goto out;
943 }
944 rc = -ENOPROTOOPT;
945 if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
946 goto out;
947 rc = llc_ui_send_data(sk, skb, noblock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948out:
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300949 if (rc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 kfree_skb(skb);
951release:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 dprintk("%s: failed sending from %02X to %02X: %d\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800953 __func__, llc->laddr.lsap, llc->daddr.lsap, rc);
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300954 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 release_sock(sk);
956 return rc ? : copied;
957}
958
959/**
960 * llc_ui_getname - return the address info of a socket
961 * @sock: Socket to get address of.
962 * @uaddr: Address structure to return information.
963 * @uaddrlen: Length of address structure.
964 * @peer: Does user want local or remote address information.
965 *
966 * Return the address information of a socket.
967 */
968static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
969 int *uaddrlen, int peer)
970{
971 struct sockaddr_llc sllc;
972 struct sock *sk = sock->sk;
973 struct llc_sock *llc = llc_sk(sk);
974 int rc = 0;
975
Jiri Slaby28e9fc52009-08-23 22:55:51 -0700976 memset(&sllc, 0, sizeof(sllc));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 lock_sock(sk);
978 if (sock_flag(sk, SOCK_ZAPPED))
979 goto out;
980 *uaddrlen = sizeof(sllc);
981 memset(uaddr, 0, *uaddrlen);
982 if (peer) {
983 rc = -ENOTCONN;
984 if (sk->sk_state != TCP_ESTABLISHED)
985 goto out;
986 if(llc->dev)
987 sllc.sllc_arphrd = llc->dev->type;
988 sllc.sllc_sap = llc->daddr.lsap;
989 memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
990 } else {
991 rc = -EINVAL;
992 if (!llc->sap)
993 goto out;
994 sllc.sllc_sap = llc->sap->laddr.lsap;
995
996 if (llc->dev) {
997 sllc.sllc_arphrd = llc->dev->type;
Jiri Pirkoa186d2a2009-05-12 22:40:12 +0000998 memcpy(&sllc.sllc_mac, llc->dev->dev_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 IFHWADDRLEN);
1000 }
1001 }
1002 rc = 0;
1003 sllc.sllc_family = AF_LLC;
1004 memcpy(uaddr, &sllc, sizeof(sllc));
1005out:
1006 release_sock(sk);
1007 return rc;
1008}
1009
1010/**
1011 * llc_ui_ioctl - io controls for PF_LLC
1012 * @sock: Socket to get/set info
1013 * @cmd: command
1014 * @arg: optional argument for cmd
1015 *
1016 * get/set info on llc sockets
1017 */
1018static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
1019 unsigned long arg)
1020{
Christoph Hellwigb5e5fa52006-01-03 14:18:33 -08001021 return -ENOIOCTLCMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022}
1023
1024/**
1025 * llc_ui_setsockopt - set various connection specific parameters.
1026 * @sock: Socket to set options on.
1027 * @level: Socket level user is requesting operations on.
1028 * @optname: Operation name.
1029 * @optval User provided operation data.
1030 * @optlen: Length of optval.
1031 *
1032 * Set various connection specific parameters.
1033 */
1034static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001035 char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036{
1037 struct sock *sk = sock->sk;
1038 struct llc_sock *llc = llc_sk(sk);
Dan Carpenter339db112010-09-10 01:56:16 +00001039 unsigned int opt;
1040 int rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041
1042 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -03001043 if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 goto out;
1045 rc = get_user(opt, (int __user *)optval);
1046 if (rc)
1047 goto out;
1048 rc = -EINVAL;
1049 switch (optname) {
1050 case LLC_OPT_RETRY:
1051 if (opt > LLC_OPT_MAX_RETRY)
1052 goto out;
1053 llc->n2 = opt;
1054 break;
1055 case LLC_OPT_SIZE:
1056 if (opt > LLC_OPT_MAX_SIZE)
1057 goto out;
1058 llc->n1 = opt;
1059 break;
1060 case LLC_OPT_ACK_TMR_EXP:
1061 if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
1062 goto out;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001063 llc->ack_timer.expire = opt * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 break;
1065 case LLC_OPT_P_TMR_EXP:
1066 if (opt > LLC_OPT_MAX_P_TMR_EXP)
1067 goto out;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001068 llc->pf_cycle_timer.expire = opt * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 break;
1070 case LLC_OPT_REJ_TMR_EXP:
1071 if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
1072 goto out;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001073 llc->rej_sent_timer.expire = opt * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 break;
1075 case LLC_OPT_BUSY_TMR_EXP:
1076 if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
1077 goto out;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001078 llc->busy_state_timer.expire = opt * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 break;
1080 case LLC_OPT_TX_WIN:
1081 if (opt > LLC_OPT_MAX_WIN)
1082 goto out;
1083 llc->k = opt;
1084 break;
1085 case LLC_OPT_RX_WIN:
1086 if (opt > LLC_OPT_MAX_WIN)
1087 goto out;
1088 llc->rw = opt;
1089 break;
Octavian Purdilae5cd6fe2009-12-26 11:51:00 +00001090 case LLC_OPT_PKTINFO:
1091 if (opt)
1092 llc->cmsg_flags |= LLC_CMSG_PKTINFO;
1093 else
1094 llc->cmsg_flags &= ~LLC_CMSG_PKTINFO;
1095 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 default:
1097 rc = -ENOPROTOOPT;
1098 goto out;
1099 }
1100 rc = 0;
1101out:
1102 release_sock(sk);
1103 return rc;
1104}
1105
1106/**
1107 * llc_ui_getsockopt - get connection specific socket info
1108 * @sock: Socket to get information from.
1109 * @level: Socket level user is requesting operations on.
1110 * @optname: Operation name.
1111 * @optval: Variable to return operation data in.
1112 * @optlen: Length of optval.
1113 *
1114 * Get connection specific socket information.
1115 */
1116static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
1117 char __user *optval, int __user *optlen)
1118{
1119 struct sock *sk = sock->sk;
1120 struct llc_sock *llc = llc_sk(sk);
1121 int val = 0, len = 0, rc = -EINVAL;
1122
1123 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -03001124 if (unlikely(level != SOL_LLC))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 goto out;
1126 rc = get_user(len, optlen);
1127 if (rc)
1128 goto out;
1129 rc = -EINVAL;
1130 if (len != sizeof(int))
1131 goto out;
1132 switch (optname) {
1133 case LLC_OPT_RETRY:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001134 val = llc->n2; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 case LLC_OPT_SIZE:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001136 val = llc->n1; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 case LLC_OPT_ACK_TMR_EXP:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001138 val = llc->ack_timer.expire / HZ; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 case LLC_OPT_P_TMR_EXP:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001140 val = llc->pf_cycle_timer.expire / HZ; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 case LLC_OPT_REJ_TMR_EXP:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001142 val = llc->rej_sent_timer.expire / HZ; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 case LLC_OPT_BUSY_TMR_EXP:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001144 val = llc->busy_state_timer.expire / HZ; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 case LLC_OPT_TX_WIN:
1146 val = llc->k; break;
1147 case LLC_OPT_RX_WIN:
1148 val = llc->rw; break;
Octavian Purdilae5cd6fe2009-12-26 11:51:00 +00001149 case LLC_OPT_PKTINFO:
1150 val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0;
1151 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 default:
1153 rc = -ENOPROTOOPT;
1154 goto out;
1155 }
1156 rc = 0;
1157 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
1158 rc = -EFAULT;
1159out:
1160 release_sock(sk);
1161 return rc;
1162}
1163
Stephen Hemmingerec1b4cf2009-10-05 05:58:39 +00001164static const struct net_proto_family llc_ui_family_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 .family = PF_LLC,
1166 .create = llc_ui_create,
1167 .owner = THIS_MODULE,
1168};
1169
Eric Dumazet90ddc4f2005-12-22 12:49:22 -08001170static const struct proto_ops llc_ui_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 .family = PF_LLC,
1172 .owner = THIS_MODULE,
1173 .release = llc_ui_release,
1174 .bind = llc_ui_bind,
1175 .connect = llc_ui_connect,
1176 .socketpair = sock_no_socketpair,
1177 .accept = llc_ui_accept,
1178 .getname = llc_ui_getname,
1179 .poll = datagram_poll,
1180 .ioctl = llc_ui_ioctl,
1181 .listen = llc_ui_listen,
1182 .shutdown = llc_ui_shutdown,
1183 .setsockopt = llc_ui_setsockopt,
1184 .getsockopt = llc_ui_getsockopt,
1185 .sendmsg = llc_ui_sendmsg,
1186 .recvmsg = llc_ui_recvmsg,
1187 .mmap = sock_no_mmap,
1188 .sendpage = sock_no_sendpage,
1189};
1190
Stephen Hemminger01af4a02009-02-22 00:02:44 -08001191static const char llc_proc_err_msg[] __initconst =
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +09001192 KERN_CRIT "LLC: Unable to register the proc_fs entries\n";
Stephen Hemminger01af4a02009-02-22 00:02:44 -08001193static const char llc_sysctl_err_msg[] __initconst =
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +09001194 KERN_CRIT "LLC: Unable to register the sysctl entries\n";
Stephen Hemminger01af4a02009-02-22 00:02:44 -08001195static const char llc_sock_err_msg[] __initconst =
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +09001196 KERN_CRIT "LLC: Unable to register the network family\n";
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001197
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198static int __init llc2_init(void)
1199{
1200 int rc = proto_register(&llc_proto, 0);
1201
1202 if (rc != 0)
1203 goto out;
1204
1205 llc_build_offset_table();
1206 llc_station_init();
1207 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
1208 rc = llc_proc_init();
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001209 if (rc != 0) {
1210 printk(llc_proc_err_msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 goto out_unregister_llc_proto;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001212 }
1213 rc = llc_sysctl_init();
1214 if (rc) {
1215 printk(llc_sysctl_err_msg);
1216 goto out_proc;
1217 }
1218 rc = sock_register(&llc_ui_family_ops);
1219 if (rc) {
1220 printk(llc_sock_err_msg);
1221 goto out_sysctl;
1222 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
1224 llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
1225out:
1226 return rc;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001227out_sysctl:
1228 llc_sysctl_exit();
1229out_proc:
1230 llc_proc_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231out_unregister_llc_proto:
1232 proto_unregister(&llc_proto);
1233 goto out;
1234}
1235
1236static void __exit llc2_exit(void)
1237{
1238 llc_station_exit();
1239 llc_remove_pack(LLC_DEST_SAP);
1240 llc_remove_pack(LLC_DEST_CONN);
1241 sock_unregister(PF_LLC);
1242 llc_proc_exit();
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001243 llc_sysctl_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 proto_unregister(&llc_proto);
1245}
1246
1247module_init(llc2_init);
1248module_exit(llc2_exit);
1249
1250MODULE_LICENSE("GPL");
1251MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1252MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1253MODULE_ALIAS_NETPROTO(PF_LLC);