blob: da7fe94bea2eb8b6d1fe84bfdb8d1fa7cf5f6879 [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>
Ingo Molnar174cd4b2017-02-02 19:15:33 +010029#include <linux/sched/signal.h>
30
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <net/llc.h>
32#include <net/llc_sap.h>
33#include <net/llc_pdu.h>
34#include <net/llc_conn.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070035#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37/* remember: uninitialized global data is zeroed because its in .bss */
38static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
39static u16 llc_ui_sap_link_no_max[256];
40static struct sockaddr_llc llc_ui_addrnull;
Eric Dumazet90ddc4f2005-12-22 12:49:22 -080041static const struct proto_ops llc_ui_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
Alan Cox5ff904d2016-09-15 18:51:25 +010043static bool llc_ui_wait_for_conn(struct sock *sk, long timeout);
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -030044static int llc_ui_wait_for_disc(struct sock *sk, long timeout);
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -030045static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47#if 0
48#define dprintk(args...) printk(KERN_DEBUG args)
49#else
Randy Dunlapc535f922020-02-25 21:08:52 -080050#define dprintk(args...) do {} while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#endif
52
Octavian Purdilae5cd6fe2009-12-26 11:51:00 +000053/* Maybe we'll add some more in the future. */
54#define LLC_CMSG_PKTINFO 1
55
56
Linus Torvalds1da177e2005-04-16 15:20:36 -070057/**
58 * llc_ui_next_link_no - return the next unused link number for a sap
59 * @sap: Address of sap to get link number from.
60 *
61 * Return the next unused link number for a given sap.
62 */
Arnaldo Carvalho de Melo2342c992006-03-20 21:27:43 -080063static inline u16 llc_ui_next_link_no(int sap)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064{
65 return llc_ui_sap_link_no_max[sap]++;
66}
67
68/**
69 * llc_proto_type - return eth protocol for ARP header type
70 * @arphrd: ARP header type.
71 *
72 * Given an ARP header type return the corresponding ethernet protocol.
73 */
Al Viro3fbd4182006-11-08 00:26:05 -080074static inline __be16 llc_proto_type(u16 arphrd)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075{
Paul Gortmaker211ed862012-05-10 17:14:35 -040076 return htons(ETH_P_802_2);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077}
78
79/**
80 * llc_ui_addr_null - determines if a address structure is null
81 * @addr: Address to test if null.
82 */
Arnaldo Carvalho de Melo2342c992006-03-20 21:27:43 -080083static inline u8 llc_ui_addr_null(struct sockaddr_llc *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070084{
85 return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr));
86}
87
88/**
89 * llc_ui_header_len - return length of llc header based on operation
90 * @sk: Socket which contains a valid llc socket type.
91 * @addr: Complete sockaddr_llc structure received from the user.
92 *
93 * Provide the length of the llc header depending on what kind of
94 * operation the user would like to perform and the type of socket.
95 * Returns the correct llc header length.
96 */
Arnaldo Carvalho de Melo2342c992006-03-20 21:27:43 -080097static inline u8 llc_ui_header_len(struct sock *sk, struct sockaddr_llc *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098{
99 u8 rc = LLC_PDU_LEN_U;
100
Pavel Skripkinc7c9d212021-07-25 00:11:59 +0300101 if (addr->sllc_test)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 rc = LLC_PDU_LEN_U;
Pavel Skripkinc7c9d212021-07-25 00:11:59 +0300103 else if (addr->sllc_xid)
104 /* We need to expand header to sizeof(struct llc_xid_info)
105 * since llc_pdu_init_as_xid_cmd() sets 4,5,6 bytes of LLC header
106 * as XID PDU. In llc_ui_sendmsg() we reserved header size and then
107 * filled all other space with user data. If we won't reserve this
108 * bytes, llc_pdu_init_as_xid_cmd() will overwrite user data
109 */
110 rc = LLC_PDU_LEN_U_XID;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 else if (sk->sk_type == SOCK_STREAM)
112 rc = LLC_PDU_LEN_I;
113 return rc;
114}
115
116/**
117 * llc_ui_send_data - send data via reliable llc2 connection
118 * @sk: Connection the socket is using.
119 * @skb: Data the user wishes to send.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 * @noblock: can we block waiting for data?
121 *
122 * Send data via reliable llc2 connection.
123 * Returns 0 upon success, non-zero if action did not succeed.
Eric Biggersfc8d5db2019-10-06 14:24:26 -0700124 *
125 * This function always consumes a reference to the skb.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 */
127static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock)
128{
129 struct llc_sock* llc = llc_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +0900131 if (unlikely(llc_data_accept_state(llc->state) ||
Jochen Friedrich451677c2005-11-14 21:57:46 -0800132 llc->remote_busy_flag ||
133 llc->p_flag)) {
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300134 long timeout = sock_sndtimeo(sk, noblock);
Eric Biggersfc8d5db2019-10-06 14:24:26 -0700135 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137 rc = llc_ui_wait_for_busy_core(sk, timeout);
Eric Biggersfc8d5db2019-10-06 14:24:26 -0700138 if (rc) {
139 kfree_skb(skb);
140 return rc;
141 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 }
Eric Biggersfc8d5db2019-10-06 14:24:26 -0700143 return llc_build_and_send_pkt(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144}
145
146static void llc_ui_sk_init(struct socket *sock, struct sock *sk)
147{
David S. Milleree5850d2008-06-17 01:21:03 -0700148 sock_graft(sk, sock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 sk->sk_type = sock->type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 sock->ops = &llc_ui_ops;
151}
152
153static struct proto llc_proto = {
Arnaldo Carvalho de Melo9c005e02006-03-20 21:27:23 -0800154 .name = "LLC",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 .owner = THIS_MODULE,
156 .obj_size = sizeof(struct llc_sock),
Paul E. McKenney5f0d5a32017-01-18 02:53:44 -0800157 .slab_flags = SLAB_TYPESAFE_BY_RCU,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158};
159
160/**
161 * llc_ui_create - alloc and init a new llc_ui socket
Eric Paris3f378b682009-11-05 22:18:14 -0800162 * @net: network namespace (must be default network)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 * @sock: Socket to initialize and attach allocated sk to.
164 * @protocol: Unused.
Eric Paris3f378b682009-11-05 22:18:14 -0800165 * @kern: on behalf of kernel or userspace
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 *
167 * Allocate and initialize a new llc_ui socket, validate the user wants a
168 * socket type we have available.
169 * Returns 0 upon success, negative upon failure.
170 */
Eric Paris3f378b682009-11-05 22:18:14 -0800171static int llc_ui_create(struct net *net, struct socket *sock, int protocol,
172 int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173{
174 struct sock *sk;
175 int rc = -ESOCKTNOSUPPORT;
176
Eric W. Biedermandf008c92012-11-16 03:03:07 +0000177 if (!ns_capable(net->user_ns, CAP_NET_RAW))
Patrick McHardy3480c632008-03-27 20:28:10 -0700178 return -EPERM;
179
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800180 if (!net_eq(net, &init_net))
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700181 return -EAFNOSUPPORT;
182
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300183 if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 rc = -ENOMEM;
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500185 sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto, kern);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 if (sk) {
187 rc = 0;
188 llc_ui_sk_init(sock, sk);
189 }
190 }
191 return rc;
192}
193
194/**
195 * llc_ui_release - shutdown socket
196 * @sock: Socket to release.
197 *
198 * Shutdown and deallocate an existing socket.
199 */
200static int llc_ui_release(struct socket *sock)
201{
202 struct sock *sk = sock->sk;
203 struct llc_sock *llc;
204
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300205 if (unlikely(sk == NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 goto out;
207 sock_hold(sk);
208 lock_sock(sk);
209 llc = llc_sk(sk);
Harvey Harrison0dc47872008-03-05 20:47:47 -0800210 dprintk("%s: closing local(%02X) remote(%02X)\n", __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 llc->laddr.lsap, llc->daddr.lsap);
212 if (!llc_send_disc(sk))
213 llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
Cong Wang3a04ce72018-04-19 21:54:34 -0700214 if (!sock_flag(sk, SOCK_ZAPPED)) {
215 struct llc_sap *sap = llc->sap;
216
217 /* Hold this for release_sock(), so that llc_backlog_rcv()
218 * could still use it.
219 */
220 llc_sap_hold(sap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 llc_sap_remove_socket(llc->sap, sk);
Cong Wang3a04ce72018-04-19 21:54:34 -0700222 release_sock(sk);
223 llc_sap_put(sap);
224 } else {
225 release_sock(sk);
226 }
Jakub Kicinskid62607c2022-06-07 21:39:55 -0700227 netdev_put(llc->dev, &llc->dev_tracker);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 sock_put(sk);
229 llc_sk_free(sk);
230out:
231 return 0;
232}
233
234/**
235 * llc_ui_autoport - provide dynamically allocate SAP number
236 *
237 * Provide the caller with a dynamically allocated SAP number according
238 * to the rules that are set in this function. Returns: 0, upon failure,
239 * SAP number otherwise.
240 */
241static int llc_ui_autoport(void)
242{
243 struct llc_sap *sap;
244 int i, tries = 0;
245
246 while (tries < LLC_SAP_DYN_TRIES) {
247 for (i = llc_ui_sap_last_autoport;
248 i < LLC_SAP_DYN_STOP; i += 2) {
249 sap = llc_sap_find(i);
250 if (!sap) {
251 llc_ui_sap_last_autoport = i + 2;
252 goto out;
253 }
Arnaldo Carvalho de Melo6e2144b2005-09-22 04:43:05 -0300254 llc_sap_put(sap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 }
256 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
257 tries++;
258 }
259 i = 0;
260out:
261 return i;
262}
263
264/**
Arnaldo Carvalho de Melo5a770c02005-09-22 03:56:26 -0300265 * llc_ui_autobind - automatically bind a socket to a sap
266 * @sock: socket to bind
267 * @addr: address to connect to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 *
Arnaldo Carvalho de Melo5a770c02005-09-22 03:56:26 -0300269 * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't
270 * specifically used llc_ui_bind to bind to an specific address/sap
271 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 * Returns: 0 upon success, negative otherwise.
273 */
274static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
275{
276 struct sock *sk = sock->sk;
277 struct llc_sock *llc = llc_sk(sk);
Eric Dumazet2d327a72022-03-24 20:58:27 -0700278 struct net_device *dev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 struct llc_sap *sap;
280 int rc = -EINVAL;
281
282 if (!sock_flag(sk, SOCK_ZAPPED))
283 goto out;
Eric Dumazeta9b11102020-06-27 13:31:50 -0700284 if (!addr->sllc_arphrd)
285 addr->sllc_arphrd = ARPHRD_ETHER;
286 if (addr->sllc_arphrd != ARPHRD_ETHER)
287 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 rc = -ENODEV;
Octavian Purdilaabf9d532009-12-26 11:51:01 +0000289 if (sk->sk_bound_dev_if) {
Eric Dumazet2d327a72022-03-24 20:58:27 -0700290 dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
291 if (dev && addr->sllc_arphrd != dev->type) {
292 dev_put(dev);
293 dev = NULL;
Octavian Purdilaabf9d532009-12-26 11:51:01 +0000294 }
295 } else
Eric Dumazet2d327a72022-03-24 20:58:27 -0700296 dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd);
297 if (!dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 goto out;
299 rc = -EUSERS;
300 llc->laddr.lsap = llc_ui_autoport();
301 if (!llc->laddr.lsap)
302 goto out;
303 rc = -EBUSY; /* some other network layer is using the sap */
304 sap = llc_sap_open(llc->laddr.lsap, NULL);
305 if (!sap)
306 goto out;
Eric Dumazet2d327a72022-03-24 20:58:27 -0700307
308 /* Note: We do not expect errors from this point. */
309 llc->dev = dev;
310 netdev_tracker_alloc(llc->dev, &llc->dev_tracker, GFP_KERNEL);
311 dev = NULL;
312
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN);
314 memcpy(&llc->addr, addr, sizeof(llc->addr));
315 /* assign new connection to its SAP */
316 llc_sap_add_socket(sap, sk);
317 sock_reset_flag(sk, SOCK_ZAPPED);
318 rc = 0;
319out:
Eric Dumazet2d327a72022-03-24 20:58:27 -0700320 dev_put(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 return rc;
322}
323
324/**
325 * llc_ui_bind - bind a socket to a specific address.
326 * @sock: Socket to bind an address to.
327 * @uaddr: Address the user wants the socket bound to.
328 * @addrlen: Length of the uaddr structure.
329 *
330 * 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 -0300331 * a specific sap only or mac + sap.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 * If the user desires to bind to a specific mac + sap, it is possible to
333 * have multiple sap connections via multiple macs.
334 * Bind and autobind for that matter must enforce the correct sap usage
335 * otherwise all hell will break loose.
336 * Returns: 0 upon success, negative otherwise.
337 */
338static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
339{
340 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
341 struct sock *sk = sock->sk;
342 struct llc_sock *llc = llc_sk(sk);
Eric Dumazet2d327a72022-03-24 20:58:27 -0700343 struct net_device *dev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 struct llc_sap *sap;
345 int rc = -EINVAL;
346
linzhang0908cf42017-05-25 14:07:18 +0800347 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300348 if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 goto out;
350 rc = -EAFNOSUPPORT;
Eric Dumazeta9b11102020-06-27 13:31:50 -0700351 if (!addr->sllc_arphrd)
352 addr->sllc_arphrd = ARPHRD_ETHER;
353 if (unlikely(addr->sllc_family != AF_LLC || addr->sllc_arphrd != ARPHRD_ETHER))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 goto out;
Tetsuo Handac68e7472019-04-12 19:55:14 +0900355 dprintk("%s: binding %02X\n", __func__, addr->sllc_sap);
Jochen Friedrichcf309e32005-09-22 04:44:55 -0300356 rc = -ENODEV;
Eric Dumazet941666c2010-12-05 01:23:53 +0000357 rcu_read_lock();
Octavian Purdilaabf9d532009-12-26 11:51:01 +0000358 if (sk->sk_bound_dev_if) {
Eric Dumazet2d327a72022-03-24 20:58:27 -0700359 dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if);
360 if (dev) {
Joe Perches951fd872013-09-01 13:11:55 -0700361 if (is_zero_ether_addr(addr->sllc_mac))
Eric Dumazet2d327a72022-03-24 20:58:27 -0700362 memcpy(addr->sllc_mac, dev->dev_addr,
Octavian Purdilaabf9d532009-12-26 11:51:01 +0000363 IFHWADDRLEN);
Eric Dumazet2d327a72022-03-24 20:58:27 -0700364 if (addr->sllc_arphrd != dev->type ||
Joe Perches951fd872013-09-01 13:11:55 -0700365 !ether_addr_equal(addr->sllc_mac,
Eric Dumazet2d327a72022-03-24 20:58:27 -0700366 dev->dev_addr)) {
Octavian Purdilaabf9d532009-12-26 11:51:01 +0000367 rc = -EINVAL;
Eric Dumazet2d327a72022-03-24 20:58:27 -0700368 dev = NULL;
Octavian Purdilaabf9d532009-12-26 11:51:01 +0000369 }
370 }
Eric Dumazet2d327a72022-03-24 20:58:27 -0700371 } else {
372 dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd,
Octavian Purdilaabf9d532009-12-26 11:51:01 +0000373 addr->sllc_mac);
Eric Dumazet2d327a72022-03-24 20:58:27 -0700374 }
375 dev_hold(dev);
Eric Dumazet941666c2010-12-05 01:23:53 +0000376 rcu_read_unlock();
Eric Dumazet2d327a72022-03-24 20:58:27 -0700377 if (!dev)
Jochen Friedrichcf309e32005-09-22 04:44:55 -0300378 goto out;
Eric Dumazet2d327a72022-03-24 20:58:27 -0700379
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 if (!addr->sllc_sap) {
381 rc = -EUSERS;
382 addr->sllc_sap = llc_ui_autoport();
383 if (!addr->sllc_sap)
384 goto out;
385 }
386 sap = llc_sap_find(addr->sllc_sap);
387 if (!sap) {
388 sap = llc_sap_open(addr->sllc_sap, NULL);
389 rc = -EBUSY; /* some other network layer is using the sap */
390 if (!sap)
391 goto out;
392 } else {
393 struct llc_addr laddr, daddr;
394 struct sock *ask;
395
396 memset(&laddr, 0, sizeof(laddr));
397 memset(&daddr, 0, sizeof(daddr));
398 /*
Michael Opdenacker59c51592007-05-09 08:57:56 +0200399 * FIXME: check if the address is multicast,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 * only SOCK_DGRAM can do this.
401 */
402 memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
403 laddr.lsap = addr->sllc_sap;
404 rc = -EADDRINUSE; /* mac + sap clash. */
405 ask = llc_lookup_established(sap, &daddr, &laddr);
406 if (ask) {
407 sock_put(ask);
Arnaldo Carvalho de Melo6e2144b2005-09-22 04:43:05 -0300408 goto out_put;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 }
410 }
Eric Dumazet2d327a72022-03-24 20:58:27 -0700411
412 /* Note: We do not expect errors from this point. */
413 llc->dev = dev;
414 netdev_tracker_alloc(llc->dev, &llc->dev_tracker, GFP_KERNEL);
415 dev = NULL;
416
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 llc->laddr.lsap = addr->sllc_sap;
418 memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN);
419 memcpy(&llc->addr, addr, sizeof(llc->addr));
420 /* assign new connection to its SAP */
421 llc_sap_add_socket(sap, sk);
422 sock_reset_flag(sk, SOCK_ZAPPED);
423 rc = 0;
Arnaldo Carvalho de Melo6e2144b2005-09-22 04:43:05 -0300424out_put:
425 llc_sap_put(sap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426out:
Eric Dumazet2d327a72022-03-24 20:58:27 -0700427 dev_put(dev);
linzhang0908cf42017-05-25 14:07:18 +0800428 release_sock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 return rc;
430}
431
432/**
433 * llc_ui_shutdown - shutdown a connect llc2 socket.
434 * @sock: Socket to shutdown.
435 * @how: What part of the socket to shutdown.
436 *
437 * Shutdown a connected llc2 socket. Currently this function only supports
438 * shutting down both sends and receives (2), we could probably make this
439 * function such that a user can shutdown only half the connection but not
440 * right now.
441 * Returns: 0 upon success, negative otherwise.
442 */
443static int llc_ui_shutdown(struct socket *sock, int how)
444{
445 struct sock *sk = sock->sk;
446 int rc = -ENOTCONN;
447
448 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300449 if (unlikely(sk->sk_state != TCP_ESTABLISHED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 goto out;
451 rc = -EINVAL;
452 if (how != 2)
453 goto out;
454 rc = llc_send_disc(sk);
455 if (!rc)
456 rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
457 /* Wake up anyone sleeping in poll */
458 sk->sk_state_change(sk);
459out:
460 release_sock(sk);
461 return rc;
462}
463
464/**
465 * llc_ui_connect - Connect to a remote llc2 mac + sap.
466 * @sock: Socket which will be connected to the remote destination.
467 * @uaddr: Remote and possibly the local address of the new connection.
468 * @addrlen: Size of uaddr structure.
469 * @flags: Operational flags specified by the user.
470 *
471 * Connect to a remote llc2 mac + sap. The caller must specify the
472 * destination mac and address to connect to. If the user hasn't previously
473 * called bind(2) with a smac the address of the first interface of the
474 * specified arp type will be used.
475 * This function will autobind if user did not previously call bind.
476 * Returns: 0 upon success, negative otherwise.
477 */
478static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
479 int addrlen, int flags)
480{
481 struct sock *sk = sock->sk;
482 struct llc_sock *llc = llc_sk(sk);
483 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 int rc = -EINVAL;
485
486 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300487 if (unlikely(addrlen != sizeof(*addr)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 goto out;
489 rc = -EAFNOSUPPORT;
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300490 if (unlikely(addr->sllc_family != AF_LLC))
491 goto out;
492 if (unlikely(sk->sk_type != SOCK_STREAM))
493 goto out;
494 rc = -EALREADY;
495 if (unlikely(sock->state == SS_CONNECTING))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 goto out;
497 /* bind connection to sap if user hasn't done it. */
498 if (sock_flag(sk, SOCK_ZAPPED)) {
499 /* bind to sap with null dev, exclusive */
500 rc = llc_ui_autobind(sock, addr);
501 if (rc)
502 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 }
Jochen Friedrich5564af22005-09-22 04:46:44 -0300504 llc->daddr.lsap = addr->sllc_sap;
505 memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 sock->state = SS_CONNECTING;
507 sk->sk_state = TCP_SYN_SENT;
508 llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap);
Arnaldo Carvalho de Melo774ccb42005-09-22 03:53:35 -0300509 rc = llc_establish_connection(sk, llc->dev->dev_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 addr->sllc_mac, addr->sllc_sap);
511 if (rc) {
Harvey Harrison0dc47872008-03-05 20:47:47 -0800512 dprintk("%s: llc_ui_send_conn failed :-(\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 sock->state = SS_UNCONNECTED;
514 sk->sk_state = TCP_CLOSE;
515 goto out;
516 }
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300517
518 if (sk->sk_state == TCP_SYN_SENT) {
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300519 const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300520
521 if (!timeo || !llc_ui_wait_for_conn(sk, timeo))
522 goto out;
523
524 rc = sock_intr_errno(timeo);
525 if (signal_pending(current))
526 goto out;
527 }
528
529 if (sk->sk_state == TCP_CLOSE)
530 goto sock_error;
531
532 sock->state = SS_CONNECTED;
533 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534out:
535 release_sock(sk);
536 return rc;
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300537sock_error:
538 rc = sock_error(sk) ? : -ECONNABORTED;
539 sock->state = SS_UNCONNECTED;
540 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541}
542
543/**
544 * llc_ui_listen - allow a normal socket to accept incoming connections
545 * @sock: Socket to allow incoming connections on.
546 * @backlog: Number of connections to queue.
547 *
548 * Allow a normal socket to accept incoming connections.
549 * Returns 0 upon success, negative otherwise.
550 */
551static int llc_ui_listen(struct socket *sock, int backlog)
552{
553 struct sock *sk = sock->sk;
554 int rc = -EINVAL;
555
556 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300557 if (unlikely(sock->state != SS_UNCONNECTED))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 goto out;
559 rc = -EOPNOTSUPP;
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300560 if (unlikely(sk->sk_type != SOCK_STREAM))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 goto out;
562 rc = -EAGAIN;
563 if (sock_flag(sk, SOCK_ZAPPED))
564 goto out;
565 rc = 0;
Eric Dumazet95c96172012-04-15 05:58:06 +0000566 if (!(unsigned int)backlog) /* BSDism */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 backlog = 1;
568 sk->sk_max_ack_backlog = backlog;
569 if (sk->sk_state != TCP_LISTEN) {
570 sk->sk_ack_backlog = 0;
571 sk->sk_state = TCP_LISTEN;
572 }
573 sk->sk_socket->flags |= __SO_ACCEPTCON;
574out:
575 release_sock(sk);
576 return rc;
577}
578
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300579static int llc_ui_wait_for_disc(struct sock *sk, long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580{
WANG Congd9dc8b02016-11-11 10:20:50 -0800581 DEFINE_WAIT_FUNC(wait, woken_wake_function);
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300582 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
WANG Congd9dc8b02016-11-11 10:20:50 -0800584 add_wait_queue(sk_sleep(sk), &wait);
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300585 while (1) {
WANG Congd9dc8b02016-11-11 10:20:50 -0800586 if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE, &wait))
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300587 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 rc = -ERESTARTSYS;
589 if (signal_pending(current))
590 break;
591 rc = -EAGAIN;
592 if (!timeout)
593 break;
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300594 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 }
WANG Congd9dc8b02016-11-11 10:20:50 -0800596 remove_wait_queue(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 return rc;
598}
599
Alan Cox5ff904d2016-09-15 18:51:25 +0100600static bool llc_ui_wait_for_conn(struct sock *sk, long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601{
WANG Congd9dc8b02016-11-11 10:20:50 -0800602 DEFINE_WAIT_FUNC(wait, woken_wake_function);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603
WANG Congd9dc8b02016-11-11 10:20:50 -0800604 add_wait_queue(sk_sleep(sk), &wait);
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300605 while (1) {
WANG Congd9dc8b02016-11-11 10:20:50 -0800606 if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT, &wait))
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300607 break;
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300608 if (signal_pending(current) || !timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 }
WANG Congd9dc8b02016-11-11 10:20:50 -0800611 remove_wait_queue(sk_sleep(sk), &wait);
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300612 return timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613}
614
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300615static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616{
WANG Congd9dc8b02016-11-11 10:20:50 -0800617 DEFINE_WAIT_FUNC(wait, woken_wake_function);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 struct llc_sock *llc = llc_sk(sk);
619 int rc;
620
WANG Congd9dc8b02016-11-11 10:20:50 -0800621 add_wait_queue(sk_sleep(sk), &wait);
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300622 while (1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 rc = 0;
Arnaldo Carvalho de Melo54fb7f22005-09-22 04:26:14 -0300624 if (sk_wait_event(sk, &timeout,
625 (sk->sk_shutdown & RCV_SHUTDOWN) ||
626 (!llc_data_accept_state(llc->state) &&
Jochen Friedrich451677c2005-11-14 21:57:46 -0800627 !llc->remote_busy_flag &&
WANG Congd9dc8b02016-11-11 10:20:50 -0800628 !llc->p_flag), &wait))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 break;
630 rc = -ERESTARTSYS;
631 if (signal_pending(current))
632 break;
633 rc = -EAGAIN;
634 if (!timeout)
635 break;
636 }
WANG Congd9dc8b02016-11-11 10:20:50 -0800637 remove_wait_queue(sk_sleep(sk), &wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 return rc;
639}
640
Arnaldo Carvalho de Melo2928c192005-09-22 05:14:33 -0300641static int llc_wait_data(struct sock *sk, long timeo)
Arnaldo Carvalho de Meloafdbe352005-09-22 04:37:07 -0300642{
643 int rc;
644
645 while (1) {
646 /*
647 * POSIX 1003.1g mandates this order.
648 */
Benjamin LaHaisec1cbe4b2005-12-13 23:22:19 -0800649 rc = sock_error(sk);
650 if (rc)
Arnaldo Carvalho de Meloafdbe352005-09-22 04:37:07 -0300651 break;
Arnaldo Carvalho de Meloafdbe352005-09-22 04:37:07 -0300652 rc = 0;
653 if (sk->sk_shutdown & RCV_SHUTDOWN)
654 break;
655 rc = -EAGAIN;
656 if (!timeo)
657 break;
658 rc = sock_intr_errno(timeo);
659 if (signal_pending(current))
660 break;
661 rc = 0;
Sabrina Dubrocadfbafc92015-07-24 18:19:25 +0200662 if (sk_wait_data(sk, &timeo, NULL))
Arnaldo Carvalho de Meloafdbe352005-09-22 04:37:07 -0300663 break;
664 }
665 return rc;
666}
667
Octavian Purdilae5cd6fe2009-12-26 11:51:00 +0000668static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb)
669{
670 struct llc_sock *llc = llc_sk(skb->sk);
671
672 if (llc->cmsg_flags & LLC_CMSG_PKTINFO) {
673 struct llc_pktinfo info;
674
Kangjie Lub8670c02016-05-03 16:35:05 -0400675 memset(&info, 0, sizeof(info));
Octavian Purdilae5cd6fe2009-12-26 11:51:00 +0000676 info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex;
677 llc_pdu_decode_dsap(skb, &info.lpi_sap);
678 llc_pdu_decode_da(skb, info.lpi_mac);
679 put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info);
680 }
681}
682
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683/**
684 * llc_ui_accept - accept a new incoming connection.
685 * @sock: Socket which connections arrive on.
686 * @newsock: Socket to move incoming connection to.
687 * @flags: User specified operational flags.
David Howellscdfbabf2017-03-09 08:09:05 +0000688 * @kern: If the socket is kernel internal
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 *
690 * Accept a new incoming connection.
691 * Returns 0 upon success, negative otherwise.
692 */
David Howellscdfbabf2017-03-09 08:09:05 +0000693static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags,
694 bool kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695{
696 struct sock *sk = sock->sk, *newsk;
697 struct llc_sock *llc, *newllc;
698 struct sk_buff *skb;
699 int rc = -EOPNOTSUPP;
700
Harvey Harrison0dc47872008-03-05 20:47:47 -0800701 dprintk("%s: accepting on %02X\n", __func__,
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +0900702 llc_sk(sk)->laddr.lsap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300704 if (unlikely(sk->sk_type != SOCK_STREAM))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 goto out;
706 rc = -EINVAL;
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -0300707 if (unlikely(sock->state != SS_UNCONNECTED ||
708 sk->sk_state != TCP_LISTEN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 goto out;
710 /* wait for a connection to arrive. */
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300711 if (skb_queue_empty(&sk->sk_receive_queue)) {
Arnaldo Carvalho de Meloafdbe352005-09-22 04:37:07 -0300712 rc = llc_wait_data(sk, sk->sk_rcvtimeo);
Arnaldo Carvalho de Melob35bd112005-09-22 04:22:39 -0300713 if (rc)
714 goto out;
715 }
Harvey Harrison0dc47872008-03-05 20:47:47 -0800716 dprintk("%s: got a new connection on %02X\n", __func__,
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +0900717 llc_sk(sk)->laddr.lsap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 skb = skb_dequeue(&sk->sk_receive_queue);
719 rc = -EINVAL;
720 if (!skb->sk)
721 goto frees;
722 rc = 0;
723 newsk = skb->sk;
724 /* attach connection to a new socket. */
725 llc_ui_sk_init(newsock, newsk);
726 sock_reset_flag(newsk, SOCK_ZAPPED);
727 newsk->sk_state = TCP_ESTABLISHED;
728 newsock->state = SS_CONNECTED;
729 llc = llc_sk(sk);
730 newllc = llc_sk(newsk);
731 memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr));
732 newllc->link = llc_ui_next_link_no(newllc->laddr.lsap);
733
734 /* put original socket back into a clean listen state. */
735 sk->sk_state = TCP_LISTEN;
Eric Dumazet7976a112019-11-05 14:11:52 -0800736 sk_acceptq_removed(sk);
Harvey Harrison0dc47872008-03-05 20:47:47 -0800737 dprintk("%s: ok success on %02X, client on %02X\n", __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
739frees:
740 kfree_skb(skb);
741out:
742 release_sock(sk);
743 return rc;
744}
745
746/**
747 * llc_ui_recvmsg - copy received data to the socket user.
748 * @sock: Socket to copy data from.
749 * @msg: Various user space related information.
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300750 * @len: Size of user buffer.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 * @flags: User specified flags.
752 *
753 * Copy received data to the socket user.
754 * Returns non-negative upon success, negative otherwise.
755 */
Ying Xue1b784142015-03-02 15:37:48 +0800756static int llc_ui_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
757 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758{
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100759 DECLARE_SOCKADDR(struct sockaddr_llc *, uaddr, msg->msg_name);
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300760 const int nonblock = flags & MSG_DONTWAIT;
761 struct sk_buff *skb = NULL;
762 struct sock *sk = sock->sk;
763 struct llc_sock *llc = llc_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 size_t copied = 0;
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300765 u32 peek_seq = 0;
Daniel Borkmann4d231b72013-12-30 23:40:50 +0100766 u32 *seq, skb_len;
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300767 unsigned long used;
768 int target; /* Read at least this many bytes */
769 long timeo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 lock_sock(sk);
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300772 copied = -ENOTCONN;
Stephen Hemminger29efcd22006-05-25 15:08:59 -0700773 if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 goto out;
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300775
776 timeo = sock_rcvtimeo(sk, nonblock);
777
778 seq = &llc->copied_seq;
779 if (flags & MSG_PEEK) {
780 peek_seq = llc->copied_seq;
781 seq = &peek_seq;
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +0900782 }
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300783
784 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
785 copied = 0;
786
787 do {
788 u32 offset;
789
790 /*
791 * We need to check signals first, to get correct SIGURG
792 * handling. FIXME: Need to check this doesn't impact 1003.1g
793 * and move it down to the bottom of the loop
794 */
795 if (signal_pending(current)) {
796 if (copied)
797 break;
798 copied = timeo ? sock_intr_errno(timeo) : -EAGAIN;
799 break;
800 }
801
802 /* Next get a buffer. */
803
804 skb = skb_peek(&sk->sk_receive_queue);
805 if (skb) {
806 offset = *seq;
807 goto found_ok_skb;
808 }
809 /* Well, if we have backlog, try to process it now yet. */
810
Eric Dumazet9ed498c2019-11-06 10:04:11 -0800811 if (copied >= target && !READ_ONCE(sk->sk_backlog.tail))
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300812 break;
813
814 if (copied) {
815 if (sk->sk_err ||
816 sk->sk_state == TCP_CLOSE ||
817 (sk->sk_shutdown & RCV_SHUTDOWN) ||
818 !timeo ||
819 (flags & MSG_PEEK))
820 break;
821 } else {
822 if (sock_flag(sk, SOCK_DONE))
823 break;
824
825 if (sk->sk_err) {
826 copied = sock_error(sk);
827 break;
828 }
829 if (sk->sk_shutdown & RCV_SHUTDOWN)
830 break;
831
Stephen Hemminger29efcd22006-05-25 15:08:59 -0700832 if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) {
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300833 if (!sock_flag(sk, SOCK_DONE)) {
834 /*
835 * This occurs when user tries to read
836 * from never connected socket.
837 */
838 copied = -ENOTCONN;
839 break;
840 }
841 break;
842 }
843 if (!timeo) {
844 copied = -EAGAIN;
845 break;
846 }
847 }
848
849 if (copied >= target) { /* Do not sleep, just process backlog. */
850 release_sock(sk);
851 lock_sock(sk);
852 } else
Sabrina Dubrocadfbafc92015-07-24 18:19:25 +0200853 sk_wait_data(sk, &timeo, NULL);
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300854
855 if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) {
Joe Perchese87cc472012-05-13 21:56:26 +0000856 net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n",
857 current->comm,
858 task_pid_nr(current));
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300859 peek_seq = llc->copied_seq;
860 }
861 continue;
862 found_ok_skb:
Daniel Borkmann4d231b72013-12-30 23:40:50 +0100863 skb_len = skb->len;
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300864 /* Ok so how much can we use? */
865 used = skb->len - offset;
866 if (len < used)
867 used = len;
868
869 if (!(flags & MSG_TRUNC)) {
David S. Miller51f3d022014-11-05 16:46:40 -0500870 int rc = skb_copy_datagram_msg(skb, offset, msg, used);
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300871 if (rc) {
872 /* Exception. Bailout! */
873 if (!copied)
874 copied = -EFAULT;
875 break;
876 }
877 }
878
879 *seq += used;
880 copied += used;
881 len -= used;
882
Alex Juncu9cef3102011-12-15 23:01:25 +0000883 /* For non stream protcols we get one packet per recvmsg call */
884 if (sk->sk_type != SOCK_STREAM)
885 goto copy_uaddr;
886
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300887 if (!(flags & MSG_PEEK)) {
Eric Dumazet604d4152018-10-22 09:24:27 -0700888 skb_unlink(skb, &sk->sk_receive_queue);
889 kfree_skb(skb);
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300890 *seq = 0;
891 }
Stephen Hemminger30a584d2006-08-03 16:38:49 -0700892
Stephen Hemminger30a584d2006-08-03 16:38:49 -0700893 /* Partial read */
Daniel Borkmann4d231b72013-12-30 23:40:50 +0100894 if (used + offset < skb_len)
Stephen Hemminger30a584d2006-08-03 16:38:49 -0700895 continue;
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300896 } while (len > 0);
897
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898out:
899 release_sock(sk);
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300900 return copied;
901copy_uaddr:
902 if (uaddr != NULL && skb != NULL) {
903 memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
904 msg->msg_namelen = sizeof(*uaddr);
905 }
Octavian Purdilae5cd6fe2009-12-26 11:51:00 +0000906 if (llc_sk(sk)->cmsg_flags)
907 llc_cmsg_rcv(msg, skb);
Alex Juncu9cef3102011-12-15 23:01:25 +0000908
909 if (!(flags & MSG_PEEK)) {
Eric Dumazet604d4152018-10-22 09:24:27 -0700910 skb_unlink(skb, &sk->sk_receive_queue);
911 kfree_skb(skb);
Dan Williams7bced392013-12-30 12:37:29 -0800912 *seq = 0;
Alex Juncu9cef3102011-12-15 23:01:25 +0000913 }
914
Arnaldo Carvalho de Melo8420e1b2005-09-22 08:29:08 -0300915 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916}
917
918/**
919 * llc_ui_sendmsg - Transmit data provided by the socket user.
920 * @sock: Socket to transmit data from.
921 * @msg: Various user related information.
922 * @len: Length of data to transmit.
923 *
924 * Transmit data provided by the socket user.
925 * Returns non-negative upon success, negative otherwise.
926 */
Ying Xue1b784142015-03-02 15:37:48 +0800927static int llc_ui_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928{
929 struct sock *sk = sock->sk;
930 struct llc_sock *llc = llc_sk(sk);
Steffen Hurrle342dfc32014-01-17 22:53:15 +0100931 DECLARE_SOCKADDR(struct sockaddr_llc *, addr, msg->msg_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932 int flags = msg->msg_flags;
933 int noblock = flags & MSG_DONTWAIT;
Eric Biggersfc8d5db2019-10-06 14:24:26 -0700934 struct sk_buff *skb = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 size_t size = 0;
936 int rc = -EINVAL, copied = 0, hdrlen;
937
Harvey Harrison0dc47872008-03-05 20:47:47 -0800938 dprintk("%s: sending from %02X to %02X\n", __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 llc->laddr.lsap, llc->daddr.lsap);
940 lock_sock(sk);
941 if (addr) {
942 if (msg->msg_namelen < sizeof(*addr))
Eric Biggersfc8d5db2019-10-06 14:24:26 -0700943 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 } else {
945 if (llc_ui_addr_null(&llc->addr))
Eric Biggersfc8d5db2019-10-06 14:24:26 -0700946 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 addr = &llc->addr;
948 }
949 /* must bind connection to sap if user hasn't done it. */
950 if (sock_flag(sk, SOCK_ZAPPED)) {
951 /* bind to sap with null dev, exclusive. */
952 rc = llc_ui_autobind(sock, addr);
953 if (rc)
Eric Biggersfc8d5db2019-10-06 14:24:26 -0700954 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 }
Arnaldo Carvalho de Melo774ccb42005-09-22 03:53:35 -0300956 hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957 size = hdrlen + len;
Arnaldo Carvalho de Melo774ccb42005-09-22 03:53:35 -0300958 if (size > llc->dev->mtu)
959 size = llc->dev->mtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 copied = size - hdrlen;
Eric Dumazet2c5d5b12018-05-07 09:02:25 -0700961 rc = -EINVAL;
962 if (copied < 0)
Eric Biggersfc8d5db2019-10-06 14:24:26 -0700963 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 release_sock(sk);
965 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
966 lock_sock(sk);
967 if (!skb)
Eric Biggersfc8d5db2019-10-06 14:24:26 -0700968 goto out;
Arnaldo Carvalho de Melo774ccb42005-09-22 03:53:35 -0300969 skb->dev = llc->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 skb->protocol = llc_proto_type(addr->sllc_arphrd);
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +0900971 skb_reserve(skb, hdrlen);
Al Viro6ce8e9c2014-04-06 21:25:44 -0400972 rc = memcpy_from_msg(skb_put(skb, copied), msg, copied);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 if (rc)
974 goto out;
975 if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) {
976 llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac,
977 addr->sllc_sap);
Eric Biggersfc8d5db2019-10-06 14:24:26 -0700978 skb = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 goto out;
980 }
981 if (addr->sllc_test) {
982 llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
983 addr->sllc_sap);
Eric Biggersfc8d5db2019-10-06 14:24:26 -0700984 skb = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985 goto out;
986 }
987 if (addr->sllc_xid) {
988 llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
989 addr->sllc_sap);
Eric Biggersfc8d5db2019-10-06 14:24:26 -0700990 skb = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 goto out;
992 }
993 rc = -ENOPROTOOPT;
994 if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
995 goto out;
996 rc = llc_ui_send_data(sk, skb, noblock);
Eric Biggersfc8d5db2019-10-06 14:24:26 -0700997 skb = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998out:
Eric Biggersfc8d5db2019-10-06 14:24:26 -0700999 kfree_skb(skb);
1000 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 dprintk("%s: failed sending from %02X to %02X: %d\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -08001002 __func__, llc->laddr.lsap, llc->daddr.lsap, rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 release_sock(sk);
1004 return rc ? : copied;
1005}
1006
1007/**
1008 * llc_ui_getname - return the address info of a socket
1009 * @sock: Socket to get address of.
1010 * @uaddr: Address structure to return information.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 * @peer: Does user want local or remote address information.
1012 *
1013 * Return the address information of a socket.
1014 */
1015static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001016 int peer)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017{
1018 struct sockaddr_llc sllc;
1019 struct sock *sk = sock->sk;
1020 struct llc_sock *llc = llc_sk(sk);
Mathias Krause3592aae2012-08-15 11:31:53 +00001021 int rc = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022
Jiri Slaby28e9fc52009-08-23 22:55:51 -07001023 memset(&sllc, 0, sizeof(sllc));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 lock_sock(sk);
1025 if (sock_flag(sk, SOCK_ZAPPED))
1026 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 if (peer) {
1028 rc = -ENOTCONN;
1029 if (sk->sk_state != TCP_ESTABLISHED)
1030 goto out;
1031 if(llc->dev)
1032 sllc.sllc_arphrd = llc->dev->type;
1033 sllc.sllc_sap = llc->daddr.lsap;
1034 memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
1035 } else {
1036 rc = -EINVAL;
1037 if (!llc->sap)
1038 goto out;
1039 sllc.sllc_sap = llc->sap->laddr.lsap;
1040
1041 if (llc->dev) {
1042 sllc.sllc_arphrd = llc->dev->type;
Jiri Pirkoa186d2a2009-05-12 22:40:12 +00001043 memcpy(&sllc.sllc_mac, llc->dev->dev_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 IFHWADDRLEN);
1045 }
1046 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 sllc.sllc_family = AF_LLC;
1048 memcpy(uaddr, &sllc, sizeof(sllc));
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01001049 rc = sizeof(sllc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050out:
1051 release_sock(sk);
1052 return rc;
1053}
1054
1055/**
1056 * llc_ui_ioctl - io controls for PF_LLC
1057 * @sock: Socket to get/set info
1058 * @cmd: command
1059 * @arg: optional argument for cmd
1060 *
1061 * get/set info on llc sockets
1062 */
1063static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
1064 unsigned long arg)
1065{
Christoph Hellwigb5e5fa52006-01-03 14:18:33 -08001066 return -ENOIOCTLCMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067}
1068
1069/**
1070 * llc_ui_setsockopt - set various connection specific parameters.
1071 * @sock: Socket to set options on.
1072 * @level: Socket level user is requesting operations on.
1073 * @optname: Operation name.
Ben Hutchings2c530402012-07-10 10:55:09 +00001074 * @optval: User provided operation data.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 * @optlen: Length of optval.
1076 *
1077 * Set various connection specific parameters.
1078 */
1079static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02001080 sockptr_t optval, unsigned int optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081{
1082 struct sock *sk = sock->sk;
1083 struct llc_sock *llc = llc_sk(sk);
Dan Carpenter339db112010-09-10 01:56:16 +00001084 unsigned int opt;
1085 int rc = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086
1087 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -03001088 if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 goto out;
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02001090 rc = copy_from_sockptr(&opt, optval, sizeof(opt));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 if (rc)
1092 goto out;
1093 rc = -EINVAL;
1094 switch (optname) {
1095 case LLC_OPT_RETRY:
1096 if (opt > LLC_OPT_MAX_RETRY)
1097 goto out;
1098 llc->n2 = opt;
1099 break;
1100 case LLC_OPT_SIZE:
1101 if (opt > LLC_OPT_MAX_SIZE)
1102 goto out;
1103 llc->n1 = opt;
1104 break;
1105 case LLC_OPT_ACK_TMR_EXP:
1106 if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
1107 goto out;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001108 llc->ack_timer.expire = opt * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 break;
1110 case LLC_OPT_P_TMR_EXP:
1111 if (opt > LLC_OPT_MAX_P_TMR_EXP)
1112 goto out;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001113 llc->pf_cycle_timer.expire = opt * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 break;
1115 case LLC_OPT_REJ_TMR_EXP:
1116 if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
1117 goto out;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001118 llc->rej_sent_timer.expire = opt * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 break;
1120 case LLC_OPT_BUSY_TMR_EXP:
1121 if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
1122 goto out;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001123 llc->busy_state_timer.expire = opt * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 break;
1125 case LLC_OPT_TX_WIN:
1126 if (opt > LLC_OPT_MAX_WIN)
1127 goto out;
1128 llc->k = opt;
1129 break;
1130 case LLC_OPT_RX_WIN:
1131 if (opt > LLC_OPT_MAX_WIN)
1132 goto out;
1133 llc->rw = opt;
1134 break;
Octavian Purdilae5cd6fe2009-12-26 11:51:00 +00001135 case LLC_OPT_PKTINFO:
1136 if (opt)
1137 llc->cmsg_flags |= LLC_CMSG_PKTINFO;
1138 else
1139 llc->cmsg_flags &= ~LLC_CMSG_PKTINFO;
1140 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 default:
1142 rc = -ENOPROTOOPT;
1143 goto out;
1144 }
1145 rc = 0;
1146out:
1147 release_sock(sk);
1148 return rc;
1149}
1150
1151/**
1152 * llc_ui_getsockopt - get connection specific socket info
1153 * @sock: Socket to get information from.
1154 * @level: Socket level user is requesting operations on.
1155 * @optname: Operation name.
1156 * @optval: Variable to return operation data in.
1157 * @optlen: Length of optval.
1158 *
1159 * Get connection specific socket information.
1160 */
1161static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
1162 char __user *optval, int __user *optlen)
1163{
1164 struct sock *sk = sock->sk;
1165 struct llc_sock *llc = llc_sk(sk);
1166 int val = 0, len = 0, rc = -EINVAL;
1167
1168 lock_sock(sk);
Arnaldo Carvalho de Meloaf426d32005-09-22 03:59:22 -03001169 if (unlikely(level != SOL_LLC))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 goto out;
1171 rc = get_user(len, optlen);
1172 if (rc)
1173 goto out;
1174 rc = -EINVAL;
1175 if (len != sizeof(int))
1176 goto out;
1177 switch (optname) {
1178 case LLC_OPT_RETRY:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001179 val = llc->n2; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180 case LLC_OPT_SIZE:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001181 val = llc->n1; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 case LLC_OPT_ACK_TMR_EXP:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001183 val = llc->ack_timer.expire / HZ; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 case LLC_OPT_P_TMR_EXP:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001185 val = llc->pf_cycle_timer.expire / HZ; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 case LLC_OPT_REJ_TMR_EXP:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001187 val = llc->rej_sent_timer.expire / HZ; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 case LLC_OPT_BUSY_TMR_EXP:
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001189 val = llc->busy_state_timer.expire / HZ; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 case LLC_OPT_TX_WIN:
1191 val = llc->k; break;
1192 case LLC_OPT_RX_WIN:
1193 val = llc->rw; break;
Octavian Purdilae5cd6fe2009-12-26 11:51:00 +00001194 case LLC_OPT_PKTINFO:
1195 val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0;
1196 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197 default:
1198 rc = -ENOPROTOOPT;
1199 goto out;
1200 }
1201 rc = 0;
1202 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
1203 rc = -EFAULT;
1204out:
1205 release_sock(sk);
1206 return rc;
1207}
1208
Stephen Hemmingerec1b4cf2009-10-05 05:58:39 +00001209static const struct net_proto_family llc_ui_family_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210 .family = PF_LLC,
1211 .create = llc_ui_create,
1212 .owner = THIS_MODULE,
1213};
1214
Eric Dumazet90ddc4f2005-12-22 12:49:22 -08001215static const struct proto_ops llc_ui_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 .family = PF_LLC,
1217 .owner = THIS_MODULE,
1218 .release = llc_ui_release,
1219 .bind = llc_ui_bind,
1220 .connect = llc_ui_connect,
1221 .socketpair = sock_no_socketpair,
1222 .accept = llc_ui_accept,
1223 .getname = llc_ui_getname,
Linus Torvaldsa11e1d42018-06-28 09:43:44 -07001224 .poll = datagram_poll,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 .ioctl = llc_ui_ioctl,
1226 .listen = llc_ui_listen,
1227 .shutdown = llc_ui_shutdown,
1228 .setsockopt = llc_ui_setsockopt,
1229 .getsockopt = llc_ui_getsockopt,
1230 .sendmsg = llc_ui_sendmsg,
1231 .recvmsg = llc_ui_recvmsg,
1232 .mmap = sock_no_mmap,
1233 .sendpage = sock_no_sendpage,
1234};
1235
Stephen Hemminger01af4a02009-02-22 00:02:44 -08001236static const char llc_proc_err_msg[] __initconst =
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +09001237 KERN_CRIT "LLC: Unable to register the proc_fs entries\n";
Stephen Hemminger01af4a02009-02-22 00:02:44 -08001238static const char llc_sysctl_err_msg[] __initconst =
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +09001239 KERN_CRIT "LLC: Unable to register the sysctl entries\n";
Stephen Hemminger01af4a02009-02-22 00:02:44 -08001240static const char llc_sock_err_msg[] __initconst =
YOSHIFUJI Hideakid57b1862007-02-09 23:25:01 +09001241 KERN_CRIT "LLC: Unable to register the network family\n";
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001242
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243static int __init llc2_init(void)
1244{
1245 int rc = proto_register(&llc_proto, 0);
1246
1247 if (rc != 0)
1248 goto out;
1249
1250 llc_build_offset_table();
1251 llc_station_init();
1252 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
1253 rc = llc_proc_init();
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001254 if (rc != 0) {
1255 printk(llc_proc_err_msg);
Ben Hutchingsf4f87202012-08-13 02:50:43 +00001256 goto out_station;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001257 }
1258 rc = llc_sysctl_init();
1259 if (rc) {
1260 printk(llc_sysctl_err_msg);
1261 goto out_proc;
1262 }
1263 rc = sock_register(&llc_ui_family_ops);
1264 if (rc) {
1265 printk(llc_sock_err_msg);
1266 goto out_sysctl;
1267 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268 llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
1269 llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
1270out:
1271 return rc;
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001272out_sysctl:
1273 llc_sysctl_exit();
1274out_proc:
1275 llc_proc_exit();
Ben Hutchingsf4f87202012-08-13 02:50:43 +00001276out_station:
1277 llc_station_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 proto_unregister(&llc_proto);
1279 goto out;
1280}
1281
1282static void __exit llc2_exit(void)
1283{
1284 llc_station_exit();
1285 llc_remove_pack(LLC_DEST_SAP);
1286 llc_remove_pack(LLC_DEST_CONN);
1287 sock_unregister(PF_LLC);
1288 llc_proc_exit();
Arnaldo Carvalho de Melo590232a2005-09-22 04:30:44 -03001289 llc_sysctl_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 proto_unregister(&llc_proto);
1291}
1292
1293module_init(llc2_init);
1294module_exit(llc2_exit);
1295
1296MODULE_LICENSE("GPL");
1297MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1298MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1299MODULE_ALIAS_NETPROTO(PF_LLC);