1 | /* |
2 | * af_llc.c - LLC User Interface SAPs |
3 | * Description: |
4 | * Functions in this module are implementation of socket based llc |
5 | * communications for the Linux operating system. Support of llc class |
6 | * one and class two is provided via SOCK_DGRAM and SOCK_STREAM |
7 | * respectively. |
8 | * |
9 | * An llc2 connection is (mac + sap), only one llc2 sap connection |
10 | * is allowed per mac. Though one sap may have multiple mac + sap |
11 | * connections. |
12 | * |
13 | * Copyright (c) 2001 by Jay Schulist <jschlst@samba.org> |
14 | * 2002-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
15 | * |
16 | * This program can be redistributed or modified under the terms of the |
17 | * GNU General Public License as published by the Free Software Foundation. |
18 | * This program is distributed without any warranty or implied warranty |
19 | * of merchantability or fitness for a particular purpose. |
20 | * |
21 | * See the GNU General Public License for more details. |
22 | */ |
23 | #include <linux/compiler.h> |
24 | #include <linux/kernel.h> |
25 | #include <linux/module.h> |
26 | #include <linux/rtnetlink.h> |
27 | #include <linux/init.h> |
28 | #include <linux/slab.h> |
29 | #include <linux/sched/signal.h> |
30 | |
31 | #include <net/llc.h> |
32 | #include <net/llc_sap.h> |
33 | #include <net/llc_pdu.h> |
34 | #include <net/llc_conn.h> |
35 | #include <net/tcp_states.h> |
36 | |
37 | /* remember: uninitialized global data is zeroed because its in .bss */ |
38 | static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START; |
39 | static u16 llc_ui_sap_link_no_max[256]; |
40 | static struct sockaddr_llc llc_ui_addrnull; |
41 | static const struct proto_ops llc_ui_ops; |
42 | |
43 | static bool llc_ui_wait_for_conn(struct sock *sk, long timeout); |
44 | static int llc_ui_wait_for_disc(struct sock *sk, long timeout); |
45 | static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout); |
46 | |
47 | #if 0 |
48 | #define dprintk(args...) printk(KERN_DEBUG args) |
49 | #else |
50 | #define dprintk(args...) do {} while (0) |
51 | #endif |
52 | |
53 | /* Maybe we'll add some more in the future. */ |
54 | #define LLC_CMSG_PKTINFO 1 |
55 | |
56 | |
57 | /** |
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 | */ |
63 | static inline u16 llc_ui_next_link_no(int sap) |
64 | { |
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 | */ |
74 | static inline __be16 llc_proto_type(u16 arphrd) |
75 | { |
76 | return htons(ETH_P_802_2); |
77 | } |
78 | |
79 | /** |
80 | * llc_ui_addr_null - determines if a address structure is null |
81 | * @addr: Address to test if null. |
82 | */ |
83 | static inline u8 llc_ui_addr_null(struct sockaddr_llc *addr) |
84 | { |
85 | return !memcmp(p: addr, q: &llc_ui_addrnull, size: 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 | */ |
97 | static inline u8 (struct sock *sk, struct sockaddr_llc *addr) |
98 | { |
99 | u8 rc = LLC_PDU_LEN_U; |
100 | |
101 | if (addr->sllc_test) |
102 | rc = LLC_PDU_LEN_U; |
103 | 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; |
111 | 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. |
120 | * @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. |
124 | * |
125 | * This function always consumes a reference to the skb. |
126 | */ |
127 | static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock) |
128 | { |
129 | struct llc_sock* llc = llc_sk(sk); |
130 | |
131 | if (unlikely(llc_data_accept_state(llc->state) || |
132 | llc->remote_busy_flag || |
133 | llc->p_flag)) { |
134 | long timeout = sock_sndtimeo(sk, noblock); |
135 | int rc; |
136 | |
137 | rc = llc_ui_wait_for_busy_core(sk, timeout); |
138 | if (rc) { |
139 | kfree_skb(skb); |
140 | return rc; |
141 | } |
142 | } |
143 | return llc_build_and_send_pkt(sk, skb); |
144 | } |
145 | |
146 | static void llc_ui_sk_init(struct socket *sock, struct sock *sk) |
147 | { |
148 | sock_graft(sk, parent: sock); |
149 | sk->sk_type = sock->type; |
150 | sock->ops = &llc_ui_ops; |
151 | } |
152 | |
153 | static struct proto llc_proto = { |
154 | .name = "LLC" , |
155 | .owner = THIS_MODULE, |
156 | .obj_size = sizeof(struct llc_sock), |
157 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
158 | }; |
159 | |
160 | /** |
161 | * llc_ui_create - alloc and init a new llc_ui socket |
162 | * @net: network namespace (must be default network) |
163 | * @sock: Socket to initialize and attach allocated sk to. |
164 | * @protocol: Unused. |
165 | * @kern: on behalf of kernel or userspace |
166 | * |
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 | */ |
171 | static int llc_ui_create(struct net *net, struct socket *sock, int protocol, |
172 | int kern) |
173 | { |
174 | struct sock *sk; |
175 | int rc = -ESOCKTNOSUPPORT; |
176 | |
177 | if (!ns_capable(ns: net->user_ns, CAP_NET_RAW)) |
178 | return -EPERM; |
179 | |
180 | if (!net_eq(net1: net, net2: &init_net)) |
181 | return -EAFNOSUPPORT; |
182 | |
183 | if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) { |
184 | rc = -ENOMEM; |
185 | sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, prot: &llc_proto, kern); |
186 | 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 | */ |
200 | static int llc_ui_release(struct socket *sock) |
201 | { |
202 | struct sock *sk = sock->sk; |
203 | struct llc_sock *llc; |
204 | |
205 | if (unlikely(sk == NULL)) |
206 | goto out; |
207 | sock_hold(sk); |
208 | lock_sock(sk); |
209 | llc = llc_sk(sk); |
210 | dprintk("%s: closing local(%02X) remote(%02X)\n" , __func__, |
211 | llc->laddr.lsap, llc->daddr.lsap); |
212 | if (!llc_send_disc(sk)) |
213 | llc_ui_wait_for_disc(sk, timeout: sk->sk_rcvtimeo); |
214 | if (!sock_flag(sk, flag: 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); |
221 | llc_sap_remove_socket(sap: llc->sap, sk); |
222 | release_sock(sk); |
223 | llc_sap_put(sap); |
224 | } else { |
225 | release_sock(sk); |
226 | } |
227 | netdev_put(dev: llc->dev, tracker: &llc->dev_tracker); |
228 | sock_put(sk); |
229 | llc_sk_free(sk); |
230 | out: |
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 | */ |
241 | static 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(sap_value: i); |
250 | if (!sap) { |
251 | llc_ui_sap_last_autoport = i + 2; |
252 | goto out; |
253 | } |
254 | llc_sap_put(sap); |
255 | } |
256 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; |
257 | tries++; |
258 | } |
259 | i = 0; |
260 | out: |
261 | return i; |
262 | } |
263 | |
264 | /** |
265 | * llc_ui_autobind - automatically bind a socket to a sap |
266 | * @sock: socket to bind |
267 | * @addr: address to connect to |
268 | * |
269 | * 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 | * |
272 | * Returns: 0 upon success, negative otherwise. |
273 | */ |
274 | static 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); |
278 | struct net_device *dev = NULL; |
279 | struct llc_sap *sap; |
280 | int rc = -EINVAL; |
281 | |
282 | if (!sock_flag(sk, flag: SOCK_ZAPPED)) |
283 | goto out; |
284 | if (!addr->sllc_arphrd) |
285 | addr->sllc_arphrd = ARPHRD_ETHER; |
286 | if (addr->sllc_arphrd != ARPHRD_ETHER) |
287 | goto out; |
288 | rc = -ENODEV; |
289 | if (sk->sk_bound_dev_if) { |
290 | dev = dev_get_by_index(net: &init_net, ifindex: sk->sk_bound_dev_if); |
291 | if (dev && addr->sllc_arphrd != dev->type) { |
292 | dev_put(dev); |
293 | dev = NULL; |
294 | } |
295 | } else |
296 | dev = dev_getfirstbyhwtype(net: &init_net, type: addr->sllc_arphrd); |
297 | if (!dev) |
298 | 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(lsap: llc->laddr.lsap, NULL); |
305 | if (!sap) |
306 | goto out; |
307 | |
308 | /* Note: We do not expect errors from this point. */ |
309 | llc->dev = dev; |
310 | netdev_tracker_alloc(dev: llc->dev, tracker: &llc->dev_tracker, GFP_KERNEL); |
311 | dev = NULL; |
312 | |
313 | 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, flag: SOCK_ZAPPED); |
318 | rc = 0; |
319 | out: |
320 | dev_put(dev); |
321 | 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 |
331 | * a specific sap only or mac + sap. |
332 | * 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 | */ |
338 | static 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); |
343 | struct net_device *dev = NULL; |
344 | struct llc_sap *sap; |
345 | int rc = -EINVAL; |
346 | |
347 | lock_sock(sk); |
348 | if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr))) |
349 | goto out; |
350 | rc = -EAFNOSUPPORT; |
351 | if (!addr->sllc_arphrd) |
352 | addr->sllc_arphrd = ARPHRD_ETHER; |
353 | if (unlikely(addr->sllc_family != AF_LLC || addr->sllc_arphrd != ARPHRD_ETHER)) |
354 | goto out; |
355 | dprintk("%s: binding %02X\n" , __func__, addr->sllc_sap); |
356 | rc = -ENODEV; |
357 | rcu_read_lock(); |
358 | if (sk->sk_bound_dev_if) { |
359 | dev = dev_get_by_index_rcu(net: &init_net, ifindex: sk->sk_bound_dev_if); |
360 | if (dev) { |
361 | if (is_zero_ether_addr(addr: addr->sllc_mac)) |
362 | memcpy(addr->sllc_mac, dev->dev_addr, |
363 | IFHWADDRLEN); |
364 | if (addr->sllc_arphrd != dev->type || |
365 | !ether_addr_equal(addr1: addr->sllc_mac, |
366 | addr2: dev->dev_addr)) { |
367 | rc = -EINVAL; |
368 | dev = NULL; |
369 | } |
370 | } |
371 | } else { |
372 | dev = dev_getbyhwaddr_rcu(net: &init_net, type: addr->sllc_arphrd, |
373 | hwaddr: addr->sllc_mac); |
374 | } |
375 | dev_hold(dev); |
376 | rcu_read_unlock(); |
377 | if (!dev) |
378 | goto out; |
379 | |
380 | 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(sap_value: addr->sllc_sap); |
387 | if (!sap) { |
388 | sap = llc_sap_open(lsap: 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 | /* |
399 | * FIXME: check if the address is multicast, |
400 | * 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: &daddr, laddr: &laddr, net: &init_net); |
406 | if (ask) { |
407 | sock_put(sk: ask); |
408 | goto out_put; |
409 | } |
410 | } |
411 | |
412 | /* Note: We do not expect errors from this point. */ |
413 | llc->dev = dev; |
414 | netdev_tracker_alloc(dev: llc->dev, tracker: &llc->dev_tracker, GFP_KERNEL); |
415 | dev = NULL; |
416 | |
417 | 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, flag: SOCK_ZAPPED); |
423 | rc = 0; |
424 | out_put: |
425 | llc_sap_put(sap); |
426 | out: |
427 | dev_put(dev); |
428 | release_sock(sk); |
429 | 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 | */ |
443 | static 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); |
449 | if (unlikely(sk->sk_state != TCP_ESTABLISHED)) |
450 | 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, timeout: sk->sk_rcvtimeo); |
457 | /* Wake up anyone sleeping in poll */ |
458 | sk->sk_state_change(sk); |
459 | out: |
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 | */ |
478 | static 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; |
484 | int rc = -EINVAL; |
485 | |
486 | lock_sock(sk); |
487 | if (unlikely(addrlen != sizeof(*addr))) |
488 | goto out; |
489 | rc = -EAFNOSUPPORT; |
490 | 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)) |
496 | goto out; |
497 | /* bind connection to sap if user hasn't done it. */ |
498 | if (sock_flag(sk, flag: SOCK_ZAPPED)) { |
499 | /* bind to sap with null dev, exclusive */ |
500 | rc = llc_ui_autobind(sock, addr); |
501 | if (rc) |
502 | goto out; |
503 | } |
504 | llc->daddr.lsap = addr->sllc_sap; |
505 | memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN); |
506 | sock->state = SS_CONNECTING; |
507 | sk->sk_state = TCP_SYN_SENT; |
508 | llc->link = llc_ui_next_link_no(sap: llc->sap->laddr.lsap); |
509 | rc = llc_establish_connection(sk, lmac: llc->dev->dev_addr, |
510 | dmac: addr->sllc_mac, dsap: addr->sllc_sap); |
511 | if (rc) { |
512 | dprintk("%s: llc_ui_send_conn failed :-(\n" , __func__); |
513 | sock->state = SS_UNCONNECTED; |
514 | sk->sk_state = TCP_CLOSE; |
515 | goto out; |
516 | } |
517 | |
518 | if (sk->sk_state == TCP_SYN_SENT) { |
519 | const long timeo = sock_sndtimeo(sk, noblock: flags & O_NONBLOCK); |
520 | |
521 | if (!timeo || !llc_ui_wait_for_conn(sk, timeout: 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; |
534 | out: |
535 | release_sock(sk); |
536 | return rc; |
537 | sock_error: |
538 | rc = sock_error(sk) ? : -ECONNABORTED; |
539 | sock->state = SS_UNCONNECTED; |
540 | goto out; |
541 | } |
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 | */ |
551 | static 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); |
557 | if (unlikely(sock->state != SS_UNCONNECTED)) |
558 | goto out; |
559 | rc = -EOPNOTSUPP; |
560 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
561 | goto out; |
562 | rc = -EAGAIN; |
563 | if (sock_flag(sk, flag: SOCK_ZAPPED)) |
564 | goto out; |
565 | rc = 0; |
566 | if (!(unsigned int)backlog) /* BSDism */ |
567 | 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; |
574 | out: |
575 | release_sock(sk); |
576 | return rc; |
577 | } |
578 | |
579 | static int llc_ui_wait_for_disc(struct sock *sk, long timeout) |
580 | { |
581 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
582 | int rc = 0; |
583 | |
584 | add_wait_queue(wq_head: sk_sleep(sk), wq_entry: &wait); |
585 | while (1) { |
586 | if (sk_wait_event(sk, &timeout, |
587 | READ_ONCE(sk->sk_state) == TCP_CLOSE, &wait)) |
588 | break; |
589 | rc = -ERESTARTSYS; |
590 | if (signal_pending(current)) |
591 | break; |
592 | rc = -EAGAIN; |
593 | if (!timeout) |
594 | break; |
595 | rc = 0; |
596 | } |
597 | remove_wait_queue(wq_head: sk_sleep(sk), wq_entry: &wait); |
598 | return rc; |
599 | } |
600 | |
601 | static bool llc_ui_wait_for_conn(struct sock *sk, long timeout) |
602 | { |
603 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
604 | |
605 | add_wait_queue(wq_head: sk_sleep(sk), wq_entry: &wait); |
606 | while (1) { |
607 | if (sk_wait_event(sk, &timeout, |
608 | READ_ONCE(sk->sk_state) != TCP_SYN_SENT, &wait)) |
609 | break; |
610 | if (signal_pending(current) || !timeout) |
611 | break; |
612 | } |
613 | remove_wait_queue(wq_head: sk_sleep(sk), wq_entry: &wait); |
614 | return timeout; |
615 | } |
616 | |
617 | static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout) |
618 | { |
619 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
620 | struct llc_sock *llc = llc_sk(sk); |
621 | int rc; |
622 | |
623 | add_wait_queue(wq_head: sk_sleep(sk), wq_entry: &wait); |
624 | while (1) { |
625 | rc = 0; |
626 | if (sk_wait_event(sk, &timeout, |
627 | (READ_ONCE(sk->sk_shutdown) & RCV_SHUTDOWN) || |
628 | (!llc_data_accept_state(llc->state) && |
629 | !llc->remote_busy_flag && |
630 | !llc->p_flag), &wait)) |
631 | break; |
632 | rc = -ERESTARTSYS; |
633 | if (signal_pending(current)) |
634 | break; |
635 | rc = -EAGAIN; |
636 | if (!timeout) |
637 | break; |
638 | } |
639 | remove_wait_queue(wq_head: sk_sleep(sk), wq_entry: &wait); |
640 | return rc; |
641 | } |
642 | |
643 | static int llc_wait_data(struct sock *sk, long timeo) |
644 | { |
645 | int rc; |
646 | |
647 | while (1) { |
648 | /* |
649 | * POSIX 1003.1g mandates this order. |
650 | */ |
651 | rc = sock_error(sk); |
652 | if (rc) |
653 | break; |
654 | rc = 0; |
655 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
656 | break; |
657 | rc = -EAGAIN; |
658 | if (!timeo) |
659 | break; |
660 | rc = sock_intr_errno(timeo); |
661 | if (signal_pending(current)) |
662 | break; |
663 | rc = 0; |
664 | if (sk_wait_data(sk, timeo: &timeo, NULL)) |
665 | break; |
666 | } |
667 | return rc; |
668 | } |
669 | |
670 | static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb) |
671 | { |
672 | struct llc_sock *llc = llc_sk(sk: skb->sk); |
673 | |
674 | if (llc->cmsg_flags & LLC_CMSG_PKTINFO) { |
675 | struct llc_pktinfo info; |
676 | |
677 | memset(&info, 0, sizeof(info)); |
678 | info.lpi_ifindex = llc_sk(sk: skb->sk)->dev->ifindex; |
679 | llc_pdu_decode_dsap(skb, dsap: &info.lpi_sap); |
680 | llc_pdu_decode_da(skb, da: info.lpi_mac); |
681 | put_cmsg(msg, SOL_LLC, type: LLC_OPT_PKTINFO, len: sizeof(info), data: &info); |
682 | } |
683 | } |
684 | |
685 | /** |
686 | * llc_ui_accept - accept a new incoming connection. |
687 | * @sock: Socket which connections arrive on. |
688 | * @newsock: Socket to move incoming connection to. |
689 | * @flags: User specified operational flags. |
690 | * @kern: If the socket is kernel internal |
691 | * |
692 | * Accept a new incoming connection. |
693 | * Returns 0 upon success, negative otherwise. |
694 | */ |
695 | static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags, |
696 | bool kern) |
697 | { |
698 | struct sock *sk = sock->sk, *newsk; |
699 | struct llc_sock *llc, *newllc; |
700 | struct sk_buff *skb; |
701 | int rc = -EOPNOTSUPP; |
702 | |
703 | dprintk("%s: accepting on %02X\n" , __func__, |
704 | llc_sk(sk)->laddr.lsap); |
705 | lock_sock(sk); |
706 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
707 | goto out; |
708 | rc = -EINVAL; |
709 | if (unlikely(sock->state != SS_UNCONNECTED || |
710 | sk->sk_state != TCP_LISTEN)) |
711 | goto out; |
712 | /* wait for a connection to arrive. */ |
713 | if (skb_queue_empty(list: &sk->sk_receive_queue)) { |
714 | rc = llc_wait_data(sk, timeo: sk->sk_rcvtimeo); |
715 | if (rc) |
716 | goto out; |
717 | } |
718 | dprintk("%s: got a new connection on %02X\n" , __func__, |
719 | llc_sk(sk)->laddr.lsap); |
720 | skb = skb_dequeue(list: &sk->sk_receive_queue); |
721 | rc = -EINVAL; |
722 | if (!skb->sk) |
723 | goto frees; |
724 | rc = 0; |
725 | newsk = skb->sk; |
726 | /* attach connection to a new socket. */ |
727 | llc_ui_sk_init(sock: newsock, sk: newsk); |
728 | sock_reset_flag(sk: newsk, flag: SOCK_ZAPPED); |
729 | newsk->sk_state = TCP_ESTABLISHED; |
730 | newsock->state = SS_CONNECTED; |
731 | llc = llc_sk(sk); |
732 | newllc = llc_sk(sk: newsk); |
733 | memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr)); |
734 | newllc->link = llc_ui_next_link_no(sap: newllc->laddr.lsap); |
735 | |
736 | /* put original socket back into a clean listen state. */ |
737 | sk->sk_state = TCP_LISTEN; |
738 | sk_acceptq_removed(sk); |
739 | dprintk("%s: ok success on %02X, client on %02X\n" , __func__, |
740 | llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap); |
741 | frees: |
742 | kfree_skb(skb); |
743 | out: |
744 | release_sock(sk); |
745 | return rc; |
746 | } |
747 | |
748 | /** |
749 | * llc_ui_recvmsg - copy received data to the socket user. |
750 | * @sock: Socket to copy data from. |
751 | * @msg: Various user space related information. |
752 | * @len: Size of user buffer. |
753 | * @flags: User specified flags. |
754 | * |
755 | * Copy received data to the socket user. |
756 | * Returns non-negative upon success, negative otherwise. |
757 | */ |
758 | static int llc_ui_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, |
759 | int flags) |
760 | { |
761 | DECLARE_SOCKADDR(struct sockaddr_llc *, uaddr, msg->msg_name); |
762 | const int nonblock = flags & MSG_DONTWAIT; |
763 | struct sk_buff *skb = NULL; |
764 | struct sock *sk = sock->sk; |
765 | struct llc_sock *llc = llc_sk(sk); |
766 | size_t copied = 0; |
767 | u32 peek_seq = 0; |
768 | u32 *seq, skb_len; |
769 | unsigned long used; |
770 | int target; /* Read at least this many bytes */ |
771 | long timeo; |
772 | |
773 | lock_sock(sk); |
774 | copied = -ENOTCONN; |
775 | if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN)) |
776 | goto out; |
777 | |
778 | timeo = sock_rcvtimeo(sk, noblock: nonblock); |
779 | |
780 | seq = &llc->copied_seq; |
781 | if (flags & MSG_PEEK) { |
782 | peek_seq = llc->copied_seq; |
783 | seq = &peek_seq; |
784 | } |
785 | |
786 | target = sock_rcvlowat(sk, waitall: flags & MSG_WAITALL, len); |
787 | copied = 0; |
788 | |
789 | do { |
790 | u32 offset; |
791 | |
792 | /* |
793 | * We need to check signals first, to get correct SIGURG |
794 | * handling. FIXME: Need to check this doesn't impact 1003.1g |
795 | * and move it down to the bottom of the loop |
796 | */ |
797 | if (signal_pending(current)) { |
798 | if (copied) |
799 | break; |
800 | copied = timeo ? sock_intr_errno(timeo) : -EAGAIN; |
801 | break; |
802 | } |
803 | |
804 | /* Next get a buffer. */ |
805 | |
806 | skb = skb_peek(list_: &sk->sk_receive_queue); |
807 | if (skb) { |
808 | offset = *seq; |
809 | goto found_ok_skb; |
810 | } |
811 | /* Well, if we have backlog, try to process it now yet. */ |
812 | |
813 | if (copied >= target && !READ_ONCE(sk->sk_backlog.tail)) |
814 | break; |
815 | |
816 | if (copied) { |
817 | if (sk->sk_err || |
818 | sk->sk_state == TCP_CLOSE || |
819 | (sk->sk_shutdown & RCV_SHUTDOWN) || |
820 | !timeo || |
821 | (flags & MSG_PEEK)) |
822 | break; |
823 | } else { |
824 | if (sock_flag(sk, flag: SOCK_DONE)) |
825 | break; |
826 | |
827 | if (sk->sk_err) { |
828 | copied = sock_error(sk); |
829 | break; |
830 | } |
831 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
832 | break; |
833 | |
834 | if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) { |
835 | if (!sock_flag(sk, flag: SOCK_DONE)) { |
836 | /* |
837 | * This occurs when user tries to read |
838 | * from never connected socket. |
839 | */ |
840 | copied = -ENOTCONN; |
841 | break; |
842 | } |
843 | break; |
844 | } |
845 | if (!timeo) { |
846 | copied = -EAGAIN; |
847 | break; |
848 | } |
849 | } |
850 | |
851 | if (copied >= target) { /* Do not sleep, just process backlog. */ |
852 | release_sock(sk); |
853 | lock_sock(sk); |
854 | } else |
855 | sk_wait_data(sk, timeo: &timeo, NULL); |
856 | |
857 | if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) { |
858 | net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n" , |
859 | current->comm, |
860 | task_pid_nr(current)); |
861 | peek_seq = llc->copied_seq; |
862 | } |
863 | continue; |
864 | found_ok_skb: |
865 | skb_len = skb->len; |
866 | /* Ok so how much can we use? */ |
867 | used = skb->len - offset; |
868 | if (len < used) |
869 | used = len; |
870 | |
871 | if (!(flags & MSG_TRUNC)) { |
872 | int rc = skb_copy_datagram_msg(from: skb, offset, msg, size: used); |
873 | if (rc) { |
874 | /* Exception. Bailout! */ |
875 | if (!copied) |
876 | copied = -EFAULT; |
877 | break; |
878 | } |
879 | } |
880 | |
881 | *seq += used; |
882 | copied += used; |
883 | len -= used; |
884 | |
885 | /* For non stream protcols we get one packet per recvmsg call */ |
886 | if (sk->sk_type != SOCK_STREAM) |
887 | goto copy_uaddr; |
888 | |
889 | if (!(flags & MSG_PEEK)) { |
890 | skb_unlink(skb, list: &sk->sk_receive_queue); |
891 | kfree_skb(skb); |
892 | *seq = 0; |
893 | } |
894 | |
895 | /* Partial read */ |
896 | if (used + offset < skb_len) |
897 | continue; |
898 | } while (len > 0); |
899 | |
900 | out: |
901 | release_sock(sk); |
902 | return copied; |
903 | copy_uaddr: |
904 | if (uaddr != NULL && skb != NULL) { |
905 | memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr)); |
906 | msg->msg_namelen = sizeof(*uaddr); |
907 | } |
908 | if (llc_sk(sk)->cmsg_flags) |
909 | llc_cmsg_rcv(msg, skb); |
910 | |
911 | if (!(flags & MSG_PEEK)) { |
912 | skb_unlink(skb, list: &sk->sk_receive_queue); |
913 | kfree_skb(skb); |
914 | *seq = 0; |
915 | } |
916 | |
917 | goto out; |
918 | } |
919 | |
920 | /** |
921 | * llc_ui_sendmsg - Transmit data provided by the socket user. |
922 | * @sock: Socket to transmit data from. |
923 | * @msg: Various user related information. |
924 | * @len: Length of data to transmit. |
925 | * |
926 | * Transmit data provided by the socket user. |
927 | * Returns non-negative upon success, negative otherwise. |
928 | */ |
929 | static int llc_ui_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
930 | { |
931 | struct sock *sk = sock->sk; |
932 | struct llc_sock *llc = llc_sk(sk); |
933 | DECLARE_SOCKADDR(struct sockaddr_llc *, addr, msg->msg_name); |
934 | int flags = msg->msg_flags; |
935 | int noblock = flags & MSG_DONTWAIT; |
936 | struct sk_buff *skb = NULL; |
937 | size_t size = 0; |
938 | int rc = -EINVAL, copied = 0, hdrlen; |
939 | |
940 | dprintk("%s: sending from %02X to %02X\n" , __func__, |
941 | llc->laddr.lsap, llc->daddr.lsap); |
942 | lock_sock(sk); |
943 | if (addr) { |
944 | if (msg->msg_namelen < sizeof(*addr)) |
945 | goto out; |
946 | } else { |
947 | if (llc_ui_addr_null(addr: &llc->addr)) |
948 | goto out; |
949 | addr = &llc->addr; |
950 | } |
951 | /* must bind connection to sap if user hasn't done it. */ |
952 | if (sock_flag(sk, flag: SOCK_ZAPPED)) { |
953 | /* bind to sap with null dev, exclusive. */ |
954 | rc = llc_ui_autobind(sock, addr); |
955 | if (rc) |
956 | goto out; |
957 | } |
958 | hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr); |
959 | size = hdrlen + len; |
960 | if (size > llc->dev->mtu) |
961 | size = llc->dev->mtu; |
962 | copied = size - hdrlen; |
963 | rc = -EINVAL; |
964 | if (copied < 0) |
965 | goto out; |
966 | release_sock(sk); |
967 | skb = sock_alloc_send_skb(sk, size, noblock, errcode: &rc); |
968 | lock_sock(sk); |
969 | if (!skb) |
970 | goto out; |
971 | skb->dev = llc->dev; |
972 | skb->protocol = llc_proto_type(arphrd: addr->sllc_arphrd); |
973 | skb_reserve(skb, len: hdrlen); |
974 | rc = memcpy_from_msg(data: skb_put(skb, len: copied), msg, len: copied); |
975 | if (rc) |
976 | goto out; |
977 | if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) { |
978 | llc_build_and_send_ui_pkt(sap: llc->sap, skb, dmac: addr->sllc_mac, |
979 | dsap: addr->sllc_sap); |
980 | skb = NULL; |
981 | goto out; |
982 | } |
983 | if (addr->sllc_test) { |
984 | llc_build_and_send_test_pkt(sap: llc->sap, skb, dmac: addr->sllc_mac, |
985 | dsap: addr->sllc_sap); |
986 | skb = NULL; |
987 | goto out; |
988 | } |
989 | if (addr->sllc_xid) { |
990 | llc_build_and_send_xid_pkt(sap: llc->sap, skb, dmac: addr->sllc_mac, |
991 | dsap: addr->sllc_sap); |
992 | skb = NULL; |
993 | goto out; |
994 | } |
995 | rc = -ENOPROTOOPT; |
996 | if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua)) |
997 | goto out; |
998 | rc = llc_ui_send_data(sk, skb, noblock); |
999 | skb = NULL; |
1000 | out: |
1001 | kfree_skb(skb); |
1002 | if (rc) |
1003 | dprintk("%s: failed sending from %02X to %02X: %d\n" , |
1004 | __func__, llc->laddr.lsap, llc->daddr.lsap, rc); |
1005 | release_sock(sk); |
1006 | return rc ? : copied; |
1007 | } |
1008 | |
1009 | /** |
1010 | * llc_ui_getname - return the address info of a socket |
1011 | * @sock: Socket to get address of. |
1012 | * @uaddr: Address structure to return information. |
1013 | * @peer: Does user want local or remote address information. |
1014 | * |
1015 | * Return the address information of a socket. |
1016 | */ |
1017 | static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr, |
1018 | int peer) |
1019 | { |
1020 | struct sockaddr_llc sllc; |
1021 | struct sock *sk = sock->sk; |
1022 | struct llc_sock *llc = llc_sk(sk); |
1023 | int rc = -EBADF; |
1024 | |
1025 | memset(&sllc, 0, sizeof(sllc)); |
1026 | lock_sock(sk); |
1027 | if (sock_flag(sk, flag: SOCK_ZAPPED)) |
1028 | goto out; |
1029 | if (peer) { |
1030 | rc = -ENOTCONN; |
1031 | if (sk->sk_state != TCP_ESTABLISHED) |
1032 | goto out; |
1033 | if(llc->dev) |
1034 | sllc.sllc_arphrd = llc->dev->type; |
1035 | sllc.sllc_sap = llc->daddr.lsap; |
1036 | memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN); |
1037 | } else { |
1038 | rc = -EINVAL; |
1039 | if (!llc->sap) |
1040 | goto out; |
1041 | sllc.sllc_sap = llc->sap->laddr.lsap; |
1042 | |
1043 | if (llc->dev) { |
1044 | sllc.sllc_arphrd = llc->dev->type; |
1045 | memcpy(&sllc.sllc_mac, llc->dev->dev_addr, |
1046 | IFHWADDRLEN); |
1047 | } |
1048 | } |
1049 | sllc.sllc_family = AF_LLC; |
1050 | memcpy(uaddr, &sllc, sizeof(sllc)); |
1051 | rc = sizeof(sllc); |
1052 | out: |
1053 | release_sock(sk); |
1054 | return rc; |
1055 | } |
1056 | |
1057 | /** |
1058 | * llc_ui_ioctl - io controls for PF_LLC |
1059 | * @sock: Socket to get/set info |
1060 | * @cmd: command |
1061 | * @arg: optional argument for cmd |
1062 | * |
1063 | * get/set info on llc sockets |
1064 | */ |
1065 | static int llc_ui_ioctl(struct socket *sock, unsigned int cmd, |
1066 | unsigned long arg) |
1067 | { |
1068 | return -ENOIOCTLCMD; |
1069 | } |
1070 | |
1071 | /** |
1072 | * llc_ui_setsockopt - set various connection specific parameters. |
1073 | * @sock: Socket to set options on. |
1074 | * @level: Socket level user is requesting operations on. |
1075 | * @optname: Operation name. |
1076 | * @optval: User provided operation data. |
1077 | * @optlen: Length of optval. |
1078 | * |
1079 | * Set various connection specific parameters. |
1080 | */ |
1081 | static int llc_ui_setsockopt(struct socket *sock, int level, int optname, |
1082 | sockptr_t optval, unsigned int optlen) |
1083 | { |
1084 | struct sock *sk = sock->sk; |
1085 | struct llc_sock *llc = llc_sk(sk); |
1086 | unsigned int opt; |
1087 | int rc = -EINVAL; |
1088 | |
1089 | lock_sock(sk); |
1090 | if (unlikely(level != SOL_LLC || optlen != sizeof(int))) |
1091 | goto out; |
1092 | rc = copy_from_sockptr(dst: &opt, src: optval, size: sizeof(opt)); |
1093 | if (rc) |
1094 | goto out; |
1095 | rc = -EINVAL; |
1096 | switch (optname) { |
1097 | case LLC_OPT_RETRY: |
1098 | if (opt > LLC_OPT_MAX_RETRY) |
1099 | goto out; |
1100 | llc->n2 = opt; |
1101 | break; |
1102 | case LLC_OPT_SIZE: |
1103 | if (opt > LLC_OPT_MAX_SIZE) |
1104 | goto out; |
1105 | llc->n1 = opt; |
1106 | break; |
1107 | case LLC_OPT_ACK_TMR_EXP: |
1108 | if (opt > LLC_OPT_MAX_ACK_TMR_EXP) |
1109 | goto out; |
1110 | llc->ack_timer.expire = opt * HZ; |
1111 | break; |
1112 | case LLC_OPT_P_TMR_EXP: |
1113 | if (opt > LLC_OPT_MAX_P_TMR_EXP) |
1114 | goto out; |
1115 | llc->pf_cycle_timer.expire = opt * HZ; |
1116 | break; |
1117 | case LLC_OPT_REJ_TMR_EXP: |
1118 | if (opt > LLC_OPT_MAX_REJ_TMR_EXP) |
1119 | goto out; |
1120 | llc->rej_sent_timer.expire = opt * HZ; |
1121 | break; |
1122 | case LLC_OPT_BUSY_TMR_EXP: |
1123 | if (opt > LLC_OPT_MAX_BUSY_TMR_EXP) |
1124 | goto out; |
1125 | llc->busy_state_timer.expire = opt * HZ; |
1126 | break; |
1127 | case LLC_OPT_TX_WIN: |
1128 | if (opt > LLC_OPT_MAX_WIN) |
1129 | goto out; |
1130 | llc->k = opt; |
1131 | break; |
1132 | case LLC_OPT_RX_WIN: |
1133 | if (opt > LLC_OPT_MAX_WIN) |
1134 | goto out; |
1135 | llc->rw = opt; |
1136 | break; |
1137 | case LLC_OPT_PKTINFO: |
1138 | if (opt) |
1139 | llc->cmsg_flags |= LLC_CMSG_PKTINFO; |
1140 | else |
1141 | llc->cmsg_flags &= ~LLC_CMSG_PKTINFO; |
1142 | break; |
1143 | default: |
1144 | rc = -ENOPROTOOPT; |
1145 | goto out; |
1146 | } |
1147 | rc = 0; |
1148 | out: |
1149 | release_sock(sk); |
1150 | return rc; |
1151 | } |
1152 | |
1153 | /** |
1154 | * llc_ui_getsockopt - get connection specific socket info |
1155 | * @sock: Socket to get information from. |
1156 | * @level: Socket level user is requesting operations on. |
1157 | * @optname: Operation name. |
1158 | * @optval: Variable to return operation data in. |
1159 | * @optlen: Length of optval. |
1160 | * |
1161 | * Get connection specific socket information. |
1162 | */ |
1163 | static int llc_ui_getsockopt(struct socket *sock, int level, int optname, |
1164 | char __user *optval, int __user *optlen) |
1165 | { |
1166 | struct sock *sk = sock->sk; |
1167 | struct llc_sock *llc = llc_sk(sk); |
1168 | int val = 0, len = 0, rc = -EINVAL; |
1169 | |
1170 | lock_sock(sk); |
1171 | if (unlikely(level != SOL_LLC)) |
1172 | goto out; |
1173 | rc = get_user(len, optlen); |
1174 | if (rc) |
1175 | goto out; |
1176 | rc = -EINVAL; |
1177 | if (len != sizeof(int)) |
1178 | goto out; |
1179 | switch (optname) { |
1180 | case LLC_OPT_RETRY: |
1181 | val = llc->n2; break; |
1182 | case LLC_OPT_SIZE: |
1183 | val = llc->n1; break; |
1184 | case LLC_OPT_ACK_TMR_EXP: |
1185 | val = llc->ack_timer.expire / HZ; break; |
1186 | case LLC_OPT_P_TMR_EXP: |
1187 | val = llc->pf_cycle_timer.expire / HZ; break; |
1188 | case LLC_OPT_REJ_TMR_EXP: |
1189 | val = llc->rej_sent_timer.expire / HZ; break; |
1190 | case LLC_OPT_BUSY_TMR_EXP: |
1191 | val = llc->busy_state_timer.expire / HZ; break; |
1192 | case LLC_OPT_TX_WIN: |
1193 | val = llc->k; break; |
1194 | case LLC_OPT_RX_WIN: |
1195 | val = llc->rw; break; |
1196 | case LLC_OPT_PKTINFO: |
1197 | val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0; |
1198 | break; |
1199 | default: |
1200 | rc = -ENOPROTOOPT; |
1201 | goto out; |
1202 | } |
1203 | rc = 0; |
1204 | if (put_user(len, optlen) || copy_to_user(to: optval, from: &val, n: len)) |
1205 | rc = -EFAULT; |
1206 | out: |
1207 | release_sock(sk); |
1208 | return rc; |
1209 | } |
1210 | |
1211 | static const struct net_proto_family llc_ui_family_ops = { |
1212 | .family = PF_LLC, |
1213 | .create = llc_ui_create, |
1214 | .owner = THIS_MODULE, |
1215 | }; |
1216 | |
1217 | static const struct proto_ops llc_ui_ops = { |
1218 | .family = PF_LLC, |
1219 | .owner = THIS_MODULE, |
1220 | .release = llc_ui_release, |
1221 | .bind = llc_ui_bind, |
1222 | .connect = llc_ui_connect, |
1223 | .socketpair = sock_no_socketpair, |
1224 | .accept = llc_ui_accept, |
1225 | .getname = llc_ui_getname, |
1226 | .poll = datagram_poll, |
1227 | .ioctl = llc_ui_ioctl, |
1228 | .listen = llc_ui_listen, |
1229 | .shutdown = llc_ui_shutdown, |
1230 | .setsockopt = llc_ui_setsockopt, |
1231 | .getsockopt = llc_ui_getsockopt, |
1232 | .sendmsg = llc_ui_sendmsg, |
1233 | .recvmsg = llc_ui_recvmsg, |
1234 | .mmap = sock_no_mmap, |
1235 | }; |
1236 | |
1237 | static const char llc_proc_err_msg[] __initconst = |
1238 | KERN_CRIT "LLC: Unable to register the proc_fs entries\n" ; |
1239 | static const char llc_sysctl_err_msg[] __initconst = |
1240 | KERN_CRIT "LLC: Unable to register the sysctl entries\n" ; |
1241 | static const char llc_sock_err_msg[] __initconst = |
1242 | KERN_CRIT "LLC: Unable to register the network family\n" ; |
1243 | |
1244 | static int __init llc2_init(void) |
1245 | { |
1246 | int rc = proto_register(prot: &llc_proto, alloc_slab: 0); |
1247 | |
1248 | if (rc != 0) |
1249 | goto out; |
1250 | |
1251 | llc_build_offset_table(); |
1252 | llc_station_init(); |
1253 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; |
1254 | rc = llc_proc_init(); |
1255 | if (rc != 0) { |
1256 | printk(llc_proc_err_msg); |
1257 | goto out_station; |
1258 | } |
1259 | rc = llc_sysctl_init(); |
1260 | if (rc) { |
1261 | printk(llc_sysctl_err_msg); |
1262 | goto out_proc; |
1263 | } |
1264 | rc = sock_register(fam: &llc_ui_family_ops); |
1265 | if (rc) { |
1266 | printk(llc_sock_err_msg); |
1267 | goto out_sysctl; |
1268 | } |
1269 | llc_add_pack(LLC_DEST_SAP, handler: llc_sap_handler); |
1270 | llc_add_pack(LLC_DEST_CONN, handler: llc_conn_handler); |
1271 | out: |
1272 | return rc; |
1273 | out_sysctl: |
1274 | llc_sysctl_exit(); |
1275 | out_proc: |
1276 | llc_proc_exit(); |
1277 | out_station: |
1278 | llc_station_exit(); |
1279 | proto_unregister(prot: &llc_proto); |
1280 | goto out; |
1281 | } |
1282 | |
1283 | static void __exit llc2_exit(void) |
1284 | { |
1285 | llc_station_exit(); |
1286 | llc_remove_pack(LLC_DEST_SAP); |
1287 | llc_remove_pack(LLC_DEST_CONN); |
1288 | sock_unregister(PF_LLC); |
1289 | llc_proc_exit(); |
1290 | llc_sysctl_exit(); |
1291 | proto_unregister(prot: &llc_proto); |
1292 | } |
1293 | |
1294 | module_init(llc2_init); |
1295 | module_exit(llc2_exit); |
1296 | |
1297 | MODULE_LICENSE("GPL" ); |
1298 | MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003" ); |
1299 | MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support" ); |
1300 | MODULE_ALIAS_NETPROTO(PF_LLC); |
1301 | |