blob: 48aaa89253e037c9b7f2e07f3bc1d03d837266fd [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{
Paul Gortmaker211ed862012-05-10 17:14:35 -040074 return htons(ETH_P_802_2);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075}
76
77/**
78 * llc_ui_addr_null - determines if a address structure is null
79 * @addr: Address to test if null.
80 */
Arnaldo Carvalho de Melo2342c992006-03-20 21:27:43 -080081static inline u8 llc_ui_addr_null(struct sockaddr_llc *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070082{
83 return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr));
84}
85
86/**
87 * llc_ui_header_len - return length of llc header based on operation
88 * @sk: Socket which contains a valid llc socket type.
89 * @addr: Complete sockaddr_llc structure received from the user.
90 *
91 * Provide the length of the llc header depending on what kind of
92 * operation the user would like to perform and the type of socket.
93 * Returns the correct llc header length.
94 */
Arnaldo Carvalho de Melo2342c992006-03-20 21:27:43 -080095static inline u8 llc_ui_header_len(struct sock *sk, struct sockaddr_llc *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070096{
97 u8 rc = LLC_PDU_LEN_U;
98
99 if (addr->sllc_test || addr->sllc_xid)
100 rc = LLC_PDU_LEN_U;
101 else if (sk->sk_type == SOCK_STREAM)
102 rc = LLC_PDU_LEN_I;
103 return rc;
104}
105
106/**
107 * llc_ui_send_data - send data via reliable llc2 connection
108 * @sk: Connection the socket is using.
109 * @skb: Data the user wishes to send.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 * @noblock: can we block waiting for data?
111 *
112 * Send data via reliable llc2 connection.
113 * Returns 0 upon success, non-zero if action did not succeed.
114 */
115static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock)
116{
117 struct llc_sock* llc = llc_sk(sk);
118 int rc = 0;
119
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +0900120 if (unlikely(llc_data_accept_state(llc->state) ||
Jochen Friedrich451677c2005-11-14 21:57:46 -0800121 llc->remote_busy_flag ||
122 llc->p_flag)) {
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300123 long timeout = sock_sndtimeo(sk, noblock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
125 rc = llc_ui_wait_for_busy_core(sk, timeout);
126 }
Arnaldo Carvalho de Melo249ff1c2005-09-22 04:32:10 -0300127 if (unlikely(!rc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 rc = llc_build_and_send_pkt(sk, skb);
129 return rc;
130}
131
132static void llc_ui_sk_init(struct socket *sock, struct sock *sk)
133{
David S. Milleree5850d2008-06-17 01:21:03 -0700134 sock_graft(sk, sock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 sk->sk_type = sock->type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 sock->ops = &llc_ui_ops;
137}
138
139static struct proto llc_proto = {
Arnaldo Carvalho de Melo9c005e02006-03-20 21:27:23 -0800140 .name = "LLC",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 .owner = THIS_MODULE,
142 .obj_size = sizeof(struct llc_sock),
Octavian Purdilab76f5a82009-12-26 11:51:02 +0000143 .slab_flags = SLAB_DESTROY_BY_RCU,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144};
145
146/**
147 * llc_ui_create - alloc and init a new llc_ui socket
Eric Paris3f378b62009-11-05 22:18:14 -0800148 * @net: network namespace (must be default network)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 * @sock: Socket to initialize and attach allocated sk to.
150 * @protocol: Unused.
Eric Paris3f378b62009-11-05 22:18:14 -0800151 * @kern: on behalf of kernel or userspace
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 *
153 * Allocate and initialize a new llc_ui socket, validate the user wants a
154 * socket type we have available.
155 * Returns 0 upon success, negative upon failure.
156 */
Eric Paris3f378b62009-11-05 22:18:14 -0800157static int llc_ui_create(struct net *net, struct socket *sock, int protocol,
158 int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159{
160 struct sock *sk;
161 int rc = -ESOCKTNOSUPPORT;
162
Eric W. Biedermandf008c92012-11-16 03:03:07 +0000163 if (!ns_capable(net->user_ns, CAP_NET_RAW))
Patrick McHardy3480c632008-03-27 20:28:10 -0700164 return -EPERM;
165
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800166 if (!net_eq(net, &init_net))
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700167 return -EAFNOSUPPORT;
168
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300169 if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 rc = -ENOMEM;
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700171 sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 if (sk) {
173 rc = 0;
174 llc_ui_sk_init(sock, sk);
175 }
176 }
177 return rc;
178}
179
180/**
181 * llc_ui_release - shutdown socket
182 * @sock: Socket to release.
183 *
184 * Shutdown and deallocate an existing socket.
185 */
186static int llc_ui_release(struct socket *sock)
187{
188 struct sock *sk = sock->sk;
189 struct llc_sock *llc;
190
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300191 if (unlikely(sk == NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 goto out;
193 sock_hold(sk);
194 lock_sock(sk);
195 llc = llc_sk(sk);
Harvey Harrison0dc47872008-03-05 20:47:47 -0800196 dprintk("%s: closing local(%02X) remote(%02X)\n", __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 llc->laddr.lsap, llc->daddr.lsap);
198 if (!llc_send_disc(sk))
199 llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
Octavian Purdila3100aa92009-12-26 11:51:08 +0000200 if (!sock_flag(sk, SOCK_ZAPPED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 llc_sap_remove_socket(llc->sap, sk);
202 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 if (llc->dev)
204 dev_put(llc->dev);
205 sock_put(sk);
206 llc_sk_free(sk);
207out:
208 return 0;
209}
210
211/**
212 * llc_ui_autoport - provide dynamically allocate SAP number
213 *
214 * Provide the caller with a dynamically allocated SAP number according
215 * to the rules that are set in this function. Returns: 0, upon failure,
216 * SAP number otherwise.
217 */
218static int llc_ui_autoport(void)
219{
220 struct llc_sap *sap;
221 int i, tries = 0;
222
223 while (tries < LLC_SAP_DYN_TRIES) {
224 for (i = llc_ui_sap_last_autoport;
225 i < LLC_SAP_DYN_STOP; i += 2) {
226 sap = llc_sap_find(i);
227 if (!sap) {
228 llc_ui_sap_last_autoport = i + 2;
229 goto out;
230 }
Arnaldo Carvalho de Melo6e2144b2005-09-22 04:43:05 -0300231 llc_sap_put(sap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 }
233 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
234 tries++;
235 }
236 i = 0;
237out:
238 return i;
239}
240
241/**
Arnaldo Carvalho de Melo5a770c02005-09-22 03:56:26 -0300242 * llc_ui_autobind - automatically bind a socket to a sap
243 * @sock: socket to bind
244 * @addr: address to connect to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 *
Arnaldo Carvalho de Melo5a770c02005-09-22 03:56:26 -0300246 * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't
247 * specifically used llc_ui_bind to bind to an specific address/sap
248 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 * Returns: 0 upon success, negative otherwise.
250 */
251static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
252{
253 struct sock *sk = sock->sk;
254 struct llc_sock *llc = llc_sk(sk);
255 struct llc_sap *sap;
256 int rc = -EINVAL;
257
258 if (!sock_flag(sk, SOCK_ZAPPED))
259 goto out;
260 rc = -ENODEV;
Octavian Purdilaabf9d532009-12-26 11:51:01 +0000261 if (sk->sk_bound_dev_if) {
262 llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
263 if (llc->dev && addr->sllc_arphrd != llc->dev->type) {
264 dev_put(llc->dev);
265 llc->dev = NULL;
266 }
267 } else
268 llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 if (!llc->dev)
270 goto out;
271 rc = -EUSERS;
272 llc->laddr.lsap = llc_ui_autoport();
273 if (!llc->laddr.lsap)
274 goto out;
275 rc = -EBUSY; /* some other network layer is using the sap */
276 sap = llc_sap_open(llc->laddr.lsap, NULL);
277 if (!sap)
278 goto out;
279 memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN);
280 memcpy(&llc->addr, addr, sizeof(llc->addr));
281 /* assign new connection to its SAP */
282 llc_sap_add_socket(sap, sk);
283 sock_reset_flag(sk, SOCK_ZAPPED);
284 rc = 0;
285out:
286 return rc;
287}
288
289/**
290 * llc_ui_bind - bind a socket to a specific address.
291 * @sock: Socket to bind an address to.
292 * @uaddr: Address the user wants the socket bound to.
293 * @addrlen: Length of the uaddr structure.
294 *
295 * 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 -0300296 * a specific sap only or mac + sap.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 * If the user desires to bind to a specific mac + sap, it is possible to
298 * have multiple sap connections via multiple macs.
299 * Bind and autobind for that matter must enforce the correct sap usage
300 * otherwise all hell will break loose.
301 * Returns: 0 upon success, negative otherwise.
302 */
303static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
304{
305 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
306 struct sock *sk = sock->sk;
307 struct llc_sock *llc = llc_sk(sk);
308 struct llc_sap *sap;
309 int rc = -EINVAL;
310
Harvey Harrison0dc47872008-03-05 20:47:47 -0800311 dprintk("%s: binding %02X\n", __func__, addr->sllc_sap);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300312 if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 goto out;
314 rc = -EAFNOSUPPORT;
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300315 if (unlikely(addr->sllc_family != AF_LLC))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 goto out;
Jochen Friedrichcf309e32005-09-22 04:44:55 -0300317 rc = -ENODEV;
Eric Dumazet941666c2010-12-05 01:23:53 +0000318 rcu_read_lock();
Octavian Purdilaabf9d532009-12-26 11:51:01 +0000319 if (sk->sk_bound_dev_if) {
Eric Dumazet941666c2010-12-05 01:23:53 +0000320 llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if);
Octavian Purdilaabf9d532009-12-26 11:51:01 +0000321 if (llc->dev) {
322 if (!addr->sllc_arphrd)
323 addr->sllc_arphrd = llc->dev->type;
324 if (llc_mac_null(addr->sllc_mac))
325 memcpy(addr->sllc_mac, llc->dev->dev_addr,
326 IFHWADDRLEN);
327 if (addr->sllc_arphrd != llc->dev->type ||
328 !llc_mac_match(addr->sllc_mac,
329 llc->dev->dev_addr)) {
330 rc = -EINVAL;
Octavian Purdilaabf9d532009-12-26 11:51:01 +0000331 llc->dev = NULL;
332 }
333 }
334 } else
Eric Dumazet941666c2010-12-05 01:23:53 +0000335 llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd,
Octavian Purdilaabf9d532009-12-26 11:51:01 +0000336 addr->sllc_mac);
Eric Dumazet941666c2010-12-05 01:23:53 +0000337 if (llc->dev)
338 dev_hold(llc->dev);
339 rcu_read_unlock();
Jochen Friedrichcf309e32005-09-22 04:44:55 -0300340 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;
Eric Dumazet95c96172012-04-15 05:58:06 +0000520 if (!(unsigned int)backlog) /* BSDism */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 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);
Radu Iliescu56ac11c2012-01-19 03:57:57 +0000715 unsigned long cpu_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 size_t copied = 0;
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300717 u32 peek_seq = 0;
718 u32 *seq;
719 unsigned long used;
720 int target; /* Read at least this many bytes */
721 long timeo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722
Mathias Krausec77a4b9c2013-04-07 01:51:56 +0000723 msg->msg_namelen = 0;
724
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 lock_sock(sk);
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300726 copied = -ENOTCONN;
Stephen Hemminger29efcd22006-05-25 15:08:59 -0700727 if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 goto out;
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300729
730 timeo = sock_rcvtimeo(sk, nonblock);
731
732 seq = &llc->copied_seq;
733 if (flags & MSG_PEEK) {
734 peek_seq = llc->copied_seq;
735 seq = &peek_seq;
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +0900736 }
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300737
738 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
739 copied = 0;
740
741 do {
742 u32 offset;
743
744 /*
745 * We need to check signals first, to get correct SIGURG
746 * handling. FIXME: Need to check this doesn't impact 1003.1g
747 * and move it down to the bottom of the loop
748 */
749 if (signal_pending(current)) {
750 if (copied)
751 break;
752 copied = timeo ? sock_intr_errno(timeo) : -EAGAIN;
753 break;
754 }
755
756 /* Next get a buffer. */
757
758 skb = skb_peek(&sk->sk_receive_queue);
759 if (skb) {
760 offset = *seq;
761 goto found_ok_skb;
762 }
763 /* Well, if we have backlog, try to process it now yet. */
764
765 if (copied >= target && !sk->sk_backlog.tail)
766 break;
767
768 if (copied) {
769 if (sk->sk_err ||
770 sk->sk_state == TCP_CLOSE ||
771 (sk->sk_shutdown & RCV_SHUTDOWN) ||
772 !timeo ||
773 (flags & MSG_PEEK))
774 break;
775 } else {
776 if (sock_flag(sk, SOCK_DONE))
777 break;
778
779 if (sk->sk_err) {
780 copied = sock_error(sk);
781 break;
782 }
783 if (sk->sk_shutdown & RCV_SHUTDOWN)
784 break;
785
Stephen Hemminger29efcd22006-05-25 15:08:59 -0700786 if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) {
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300787 if (!sock_flag(sk, SOCK_DONE)) {
788 /*
789 * This occurs when user tries to read
790 * from never connected socket.
791 */
792 copied = -ENOTCONN;
793 break;
794 }
795 break;
796 }
797 if (!timeo) {
798 copied = -EAGAIN;
799 break;
800 }
801 }
802
803 if (copied >= target) { /* Do not sleep, just process backlog. */
804 release_sock(sk);
805 lock_sock(sk);
806 } else
807 sk_wait_data(sk, &timeo);
808
809 if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) {
Joe Perchese87cc472012-05-13 21:56:26 +0000810 net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n",
811 current->comm,
812 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);
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000843 sk_eat_skb(sk, skb, false);
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);
Eric Dumazetdc6b9b72012-05-16 22:48:15 +0000866 sk_eat_skb(sk, skb, false);
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);
Mathias Krause3592aae2012-08-15 11:31:53 +0000974 int rc = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975
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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 if (peer) {
982 rc = -ENOTCONN;
983 if (sk->sk_state != TCP_ESTABLISHED)
984 goto out;
985 if(llc->dev)
986 sllc.sllc_arphrd = llc->dev->type;
987 sllc.sllc_sap = llc->daddr.lsap;
988 memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
989 } else {
990 rc = -EINVAL;
991 if (!llc->sap)
992 goto out;
993 sllc.sllc_sap = llc->sap->laddr.lsap;
994
995 if (llc->dev) {
996 sllc.sllc_arphrd = llc->dev->type;
Jiri Pirkoa186d2a2009-05-12 22:40:12 +0000997 memcpy(&sllc.sllc_mac, llc->dev->dev_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 IFHWADDRLEN);
999 }
1000 }
1001 rc = 0;
1002 sllc.sllc_family = AF_LLC;
1003 memcpy(uaddr, &sllc, sizeof(sllc));
1004out:
1005 release_sock(sk);
1006 return rc;
1007}
1008
1009/**
1010 * llc_ui_ioctl - io controls for PF_LLC
1011 * @sock: Socket to get/set info
1012 * @cmd: command
1013 * @arg: optional argument for cmd
1014 *
1015 * get/set info on llc sockets
1016 */
1017static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
1018 unsigned long arg)
1019{
Christoph Hellwigb5e5fa52006-01-03 14:18:33 -08001020 return -ENOIOCTLCMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021}
1022
1023/**
1024 * llc_ui_setsockopt - set various connection specific parameters.
1025 * @sock: Socket to set options on.
1026 * @level: Socket level user is requesting operations on.
1027 * @optname: Operation name.
Ben Hutchings2c530402012-07-10 10:55:09 +00001028 * @optval: User provided operation data.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 * @optlen: Length of optval.
1030 *
1031 * Set various connection specific parameters.
1032 */
1033static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -07001034 char __user *optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035{
1036 struct sock *sk = sock->sk;
1037 struct llc_sock *llc = llc_sk(sk);
Dan Carpenter339db112010-09-10 01:56:16 +00001038 unsigned int opt;
1039 int rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040
1041 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -03001042 if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 goto out;
1044 rc = get_user(opt, (int __user *)optval);
1045 if (rc)
1046 goto out;
1047 rc = -EINVAL;
1048 switch (optname) {
1049 case LLC_OPT_RETRY:
1050 if (opt > LLC_OPT_MAX_RETRY)
1051 goto out;
1052 llc->n2 = opt;
1053 break;
1054 case LLC_OPT_SIZE:
1055 if (opt > LLC_OPT_MAX_SIZE)
1056 goto out;
1057 llc->n1 = opt;
1058 break;
1059 case LLC_OPT_ACK_TMR_EXP:
1060 if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
1061 goto out;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001062 llc->ack_timer.expire = opt * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 break;
1064 case LLC_OPT_P_TMR_EXP:
1065 if (opt > LLC_OPT_MAX_P_TMR_EXP)
1066 goto out;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001067 llc->pf_cycle_timer.expire = opt * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 break;
1069 case LLC_OPT_REJ_TMR_EXP:
1070 if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
1071 goto out;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001072 llc->rej_sent_timer.expire = opt * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 break;
1074 case LLC_OPT_BUSY_TMR_EXP:
1075 if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
1076 goto out;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001077 llc->busy_state_timer.expire = opt * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 break;
1079 case LLC_OPT_TX_WIN:
1080 if (opt > LLC_OPT_MAX_WIN)
1081 goto out;
1082 llc->k = opt;
1083 break;
1084 case LLC_OPT_RX_WIN:
1085 if (opt > LLC_OPT_MAX_WIN)
1086 goto out;
1087 llc->rw = opt;
1088 break;
Octavian Purdilae5cd6fe2009-12-26 11:51:00 +00001089 case LLC_OPT_PKTINFO:
1090 if (opt)
1091 llc->cmsg_flags |= LLC_CMSG_PKTINFO;
1092 else
1093 llc->cmsg_flags &= ~LLC_CMSG_PKTINFO;
1094 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 default:
1096 rc = -ENOPROTOOPT;
1097 goto out;
1098 }
1099 rc = 0;
1100out:
1101 release_sock(sk);
1102 return rc;
1103}
1104
1105/**
1106 * llc_ui_getsockopt - get connection specific socket info
1107 * @sock: Socket to get information from.
1108 * @level: Socket level user is requesting operations on.
1109 * @optname: Operation name.
1110 * @optval: Variable to return operation data in.
1111 * @optlen: Length of optval.
1112 *
1113 * Get connection specific socket information.
1114 */
1115static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
1116 char __user *optval, int __user *optlen)
1117{
1118 struct sock *sk = sock->sk;
1119 struct llc_sock *llc = llc_sk(sk);
1120 int val = 0, len = 0, rc = -EINVAL;
1121
1122 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -03001123 if (unlikely(level != SOL_LLC))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 goto out;
1125 rc = get_user(len, optlen);
1126 if (rc)
1127 goto out;
1128 rc = -EINVAL;
1129 if (len != sizeof(int))
1130 goto out;
1131 switch (optname) {
1132 case LLC_OPT_RETRY:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001133 val = llc->n2; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134 case LLC_OPT_SIZE:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001135 val = llc->n1; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 case LLC_OPT_ACK_TMR_EXP:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001137 val = llc->ack_timer.expire / HZ; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 case LLC_OPT_P_TMR_EXP:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001139 val = llc->pf_cycle_timer.expire / HZ; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 case LLC_OPT_REJ_TMR_EXP:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001141 val = llc->rej_sent_timer.expire / HZ; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 case LLC_OPT_BUSY_TMR_EXP:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001143 val = llc->busy_state_timer.expire / HZ; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144 case LLC_OPT_TX_WIN:
1145 val = llc->k; break;
1146 case LLC_OPT_RX_WIN:
1147 val = llc->rw; break;
Octavian Purdilae5cd6fe2009-12-26 11:51:00 +00001148 case LLC_OPT_PKTINFO:
1149 val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0;
1150 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 default:
1152 rc = -ENOPROTOOPT;
1153 goto out;
1154 }
1155 rc = 0;
1156 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
1157 rc = -EFAULT;
1158out:
1159 release_sock(sk);
1160 return rc;
1161}
1162
Stephen Hemmingerec1b4cf2009-10-05 05:58:39 +00001163static const struct net_proto_family llc_ui_family_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 .family = PF_LLC,
1165 .create = llc_ui_create,
1166 .owner = THIS_MODULE,
1167};
1168
Eric Dumazet90ddc4f2005-12-22 12:49:22 -08001169static const struct proto_ops llc_ui_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 .family = PF_LLC,
1171 .owner = THIS_MODULE,
1172 .release = llc_ui_release,
1173 .bind = llc_ui_bind,
1174 .connect = llc_ui_connect,
1175 .socketpair = sock_no_socketpair,
1176 .accept = llc_ui_accept,
1177 .getname = llc_ui_getname,
1178 .poll = datagram_poll,
1179 .ioctl = llc_ui_ioctl,
1180 .listen = llc_ui_listen,
1181 .shutdown = llc_ui_shutdown,
1182 .setsockopt = llc_ui_setsockopt,
1183 .getsockopt = llc_ui_getsockopt,
1184 .sendmsg = llc_ui_sendmsg,
1185 .recvmsg = llc_ui_recvmsg,
1186 .mmap = sock_no_mmap,
1187 .sendpage = sock_no_sendpage,
1188};
1189
Stephen Hemminger01af4a02009-02-22 00:02:44 -08001190static const char llc_proc_err_msg[] __initconst =
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +09001191 KERN_CRIT "LLC: Unable to register the proc_fs entries\n";
Stephen Hemminger01af4a02009-02-22 00:02:44 -08001192static const char llc_sysctl_err_msg[] __initconst =
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +09001193 KERN_CRIT "LLC: Unable to register the sysctl entries\n";
Stephen Hemminger01af4a02009-02-22 00:02:44 -08001194static const char llc_sock_err_msg[] __initconst =
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +09001195 KERN_CRIT "LLC: Unable to register the network family\n";
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001196
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197static int __init llc2_init(void)
1198{
1199 int rc = proto_register(&llc_proto, 0);
1200
1201 if (rc != 0)
1202 goto out;
1203
1204 llc_build_offset_table();
1205 llc_station_init();
1206 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
1207 rc = llc_proc_init();
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001208 if (rc != 0) {
1209 printk(llc_proc_err_msg);
Ben Hutchingsf4f87202012-08-13 02:50:43 +00001210 goto out_station;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001211 }
1212 rc = llc_sysctl_init();
1213 if (rc) {
1214 printk(llc_sysctl_err_msg);
1215 goto out_proc;
1216 }
1217 rc = sock_register(&llc_ui_family_ops);
1218 if (rc) {
1219 printk(llc_sock_err_msg);
1220 goto out_sysctl;
1221 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
1223 llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
1224out:
1225 return rc;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001226out_sysctl:
1227 llc_sysctl_exit();
1228out_proc:
1229 llc_proc_exit();
Ben Hutchingsf4f87202012-08-13 02:50:43 +00001230out_station:
1231 llc_station_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 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);