Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | */ | |
6e2144b7 | 23 | #include <linux/compiler.h> |
1da177e4 LT |
24 | #include <linux/kernel.h> |
25 | #include <linux/module.h> | |
1da177e4 LT |
26 | #include <linux/rtnetlink.h> |
27 | #include <linux/init.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
1da177e4 LT |
29 | #include <net/llc.h> |
30 | #include <net/llc_sap.h> | |
31 | #include <net/llc_pdu.h> | |
32 | #include <net/llc_conn.h> | |
c752f073 | 33 | #include <net/tcp_states.h> |
1da177e4 LT |
34 | |
35 | /* remember: uninitialized global data is zeroed because its in .bss */ | |
36 | static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START; | |
37 | static u16 llc_ui_sap_link_no_max[256]; | |
38 | static struct sockaddr_llc llc_ui_addrnull; | |
90ddc4f0 | 39 | static const struct proto_ops llc_ui_ops; |
1da177e4 | 40 | |
54fb7f25 ACM |
41 | static int llc_ui_wait_for_conn(struct sock *sk, long timeout); |
42 | static int llc_ui_wait_for_disc(struct sock *sk, long timeout); | |
54fb7f25 | 43 | static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout); |
1da177e4 LT |
44 | |
45 | #if 0 | |
46 | #define dprintk(args...) printk(KERN_DEBUG args) | |
47 | #else | |
48 | #define dprintk(args...) | |
49 | #endif | |
50 | ||
e5cd6fe3 OP |
51 | /* Maybe we'll add some more in the future. */ |
52 | #define LLC_CMSG_PKTINFO 1 | |
53 | ||
54 | ||
1da177e4 LT |
55 | /** |
56 | * llc_ui_next_link_no - return the next unused link number for a sap | |
57 | * @sap: Address of sap to get link number from. | |
58 | * | |
59 | * Return the next unused link number for a given sap. | |
60 | */ | |
2342c990 | 61 | static inline u16 llc_ui_next_link_no(int sap) |
1da177e4 LT |
62 | { |
63 | return llc_ui_sap_link_no_max[sap]++; | |
64 | } | |
65 | ||
66 | /** | |
67 | * llc_proto_type - return eth protocol for ARP header type | |
68 | * @arphrd: ARP header type. | |
69 | * | |
70 | * Given an ARP header type return the corresponding ethernet protocol. | |
71 | */ | |
3fbd418a | 72 | static inline __be16 llc_proto_type(u16 arphrd) |
1da177e4 | 73 | { |
211ed865 | 74 | return htons(ETH_P_802_2); |
1da177e4 LT |
75 | } |
76 | ||
77 | /** | |
78 | * llc_ui_addr_null - determines if a address structure is null | |
79 | * @addr: Address to test if null. | |
80 | */ | |
2342c990 | 81 | static inline u8 llc_ui_addr_null(struct sockaddr_llc *addr) |
1da177e4 LT |
82 | { |
83 | return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr)); | |
84 | } | |
85 | ||
86 | /** | |
87 | * llc_ui_header_len - return length of llc header based on operation | |
88 | * @sk: Socket which contains a valid llc socket type. | |
89 | * @addr: Complete sockaddr_llc structure received from the user. | |
90 | * | |
91 | * Provide the length of the llc header depending on what kind of | |
92 | * operation the user would like to perform and the type of socket. | |
93 | * Returns the correct llc header length. | |
94 | */ | |
2342c990 | 95 | static inline u8 llc_ui_header_len(struct sock *sk, struct sockaddr_llc *addr) |
1da177e4 LT |
96 | { |
97 | u8 rc = LLC_PDU_LEN_U; | |
98 | ||
99 | if (addr->sllc_test || addr->sllc_xid) | |
100 | rc = LLC_PDU_LEN_U; | |
101 | else if (sk->sk_type == SOCK_STREAM) | |
102 | rc = LLC_PDU_LEN_I; | |
103 | return rc; | |
104 | } | |
105 | ||
106 | /** | |
107 | * llc_ui_send_data - send data via reliable llc2 connection | |
108 | * @sk: Connection the socket is using. | |
109 | * @skb: Data the user wishes to send. | |
1da177e4 LT |
110 | * @noblock: can we block waiting for data? |
111 | * | |
112 | * Send data via reliable llc2 connection. | |
113 | * Returns 0 upon success, non-zero if action did not succeed. | |
114 | */ | |
115 | static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock) | |
116 | { | |
117 | struct llc_sock* llc = llc_sk(sk); | |
118 | int rc = 0; | |
119 | ||
d57b1869 | 120 | if (unlikely(llc_data_accept_state(llc->state) || |
451677c4 JF |
121 | llc->remote_busy_flag || |
122 | llc->p_flag)) { | |
54fb7f25 | 123 | long timeout = sock_sndtimeo(sk, noblock); |
1da177e4 LT |
124 | |
125 | rc = llc_ui_wait_for_busy_core(sk, timeout); | |
126 | } | |
249ff1c6 | 127 | if (unlikely(!rc)) |
1da177e4 LT |
128 | rc = llc_build_and_send_pkt(sk, skb); |
129 | return rc; | |
130 | } | |
131 | ||
132 | static void llc_ui_sk_init(struct socket *sock, struct sock *sk) | |
133 | { | |
ee5850de | 134 | sock_graft(sk, sock); |
1da177e4 | 135 | sk->sk_type = sock->type; |
1da177e4 LT |
136 | sock->ops = &llc_ui_ops; |
137 | } | |
138 | ||
139 | static struct proto llc_proto = { | |
9c005e01 | 140 | .name = "LLC", |
1da177e4 LT |
141 | .owner = THIS_MODULE, |
142 | .obj_size = sizeof(struct llc_sock), | |
b76f5a84 | 143 | .slab_flags = SLAB_DESTROY_BY_RCU, |
1da177e4 LT |
144 | }; |
145 | ||
146 | /** | |
147 | * llc_ui_create - alloc and init a new llc_ui socket | |
3f378b68 | 148 | * @net: network namespace (must be default network) |
1da177e4 LT |
149 | * @sock: Socket to initialize and attach allocated sk to. |
150 | * @protocol: Unused. | |
3f378b68 | 151 | * @kern: on behalf of kernel or userspace |
1da177e4 LT |
152 | * |
153 | * Allocate and initialize a new llc_ui socket, validate the user wants a | |
154 | * socket type we have available. | |
155 | * Returns 0 upon success, negative upon failure. | |
156 | */ | |
3f378b68 EP |
157 | static int llc_ui_create(struct net *net, struct socket *sock, int protocol, |
158 | int kern) | |
1da177e4 LT |
159 | { |
160 | struct sock *sk; | |
161 | int rc = -ESOCKTNOSUPPORT; | |
162 | ||
df008c91 | 163 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
3480c63b PM |
164 | return -EPERM; |
165 | ||
09ad9bc7 | 166 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
167 | return -EAFNOSUPPORT; |
168 | ||
af426d32 | 169 | if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) { |
1da177e4 | 170 | rc = -ENOMEM; |
1b8d7ae4 | 171 | sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto); |
1da177e4 LT |
172 | if (sk) { |
173 | rc = 0; | |
174 | llc_ui_sk_init(sock, sk); | |
175 | } | |
176 | } | |
177 | return rc; | |
178 | } | |
179 | ||
180 | /** | |
181 | * llc_ui_release - shutdown socket | |
182 | * @sock: Socket to release. | |
183 | * | |
184 | * Shutdown and deallocate an existing socket. | |
185 | */ | |
186 | static int llc_ui_release(struct socket *sock) | |
187 | { | |
188 | struct sock *sk = sock->sk; | |
189 | struct llc_sock *llc; | |
190 | ||
af426d32 | 191 | if (unlikely(sk == NULL)) |
1da177e4 LT |
192 | goto out; |
193 | sock_hold(sk); | |
194 | lock_sock(sk); | |
195 | llc = llc_sk(sk); | |
0dc47877 | 196 | dprintk("%s: closing local(%02X) remote(%02X)\n", __func__, |
1da177e4 LT |
197 | llc->laddr.lsap, llc->daddr.lsap); |
198 | if (!llc_send_disc(sk)) | |
199 | llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); | |
3100aa9d | 200 | if (!sock_flag(sk, SOCK_ZAPPED)) |
1da177e4 LT |
201 | llc_sap_remove_socket(llc->sap, sk); |
202 | release_sock(sk); | |
1da177e4 LT |
203 | if (llc->dev) |
204 | dev_put(llc->dev); | |
205 | sock_put(sk); | |
206 | llc_sk_free(sk); | |
207 | out: | |
208 | return 0; | |
209 | } | |
210 | ||
211 | /** | |
212 | * llc_ui_autoport - provide dynamically allocate SAP number | |
213 | * | |
214 | * Provide the caller with a dynamically allocated SAP number according | |
215 | * to the rules that are set in this function. Returns: 0, upon failure, | |
216 | * SAP number otherwise. | |
217 | */ | |
218 | static int llc_ui_autoport(void) | |
219 | { | |
220 | struct llc_sap *sap; | |
221 | int i, tries = 0; | |
222 | ||
223 | while (tries < LLC_SAP_DYN_TRIES) { | |
224 | for (i = llc_ui_sap_last_autoport; | |
225 | i < LLC_SAP_DYN_STOP; i += 2) { | |
226 | sap = llc_sap_find(i); | |
227 | if (!sap) { | |
228 | llc_ui_sap_last_autoport = i + 2; | |
229 | goto out; | |
230 | } | |
6e2144b7 | 231 | llc_sap_put(sap); |
1da177e4 LT |
232 | } |
233 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; | |
234 | tries++; | |
235 | } | |
236 | i = 0; | |
237 | out: | |
238 | return i; | |
239 | } | |
240 | ||
241 | /** | |
5a770c02 ACM |
242 | * llc_ui_autobind - automatically bind a socket to a sap |
243 | * @sock: socket to bind | |
244 | * @addr: address to connect to | |
245 | * | |
246 | * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't | |
247 | * specifically used llc_ui_bind to bind to an specific address/sap | |
1da177e4 | 248 | * |
1da177e4 LT |
249 | * Returns: 0 upon success, negative otherwise. |
250 | */ | |
251 | static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr) | |
252 | { | |
253 | struct sock *sk = sock->sk; | |
254 | struct llc_sock *llc = llc_sk(sk); | |
255 | struct llc_sap *sap; | |
256 | int rc = -EINVAL; | |
257 | ||
258 | if (!sock_flag(sk, SOCK_ZAPPED)) | |
259 | goto out; | |
260 | rc = -ENODEV; | |
abf9d537 OP |
261 | if (sk->sk_bound_dev_if) { |
262 | llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if); | |
263 | if (llc->dev && addr->sllc_arphrd != llc->dev->type) { | |
264 | dev_put(llc->dev); | |
265 | llc->dev = NULL; | |
266 | } | |
267 | } else | |
268 | llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd); | |
1da177e4 LT |
269 | if (!llc->dev) |
270 | goto out; | |
271 | rc = -EUSERS; | |
272 | llc->laddr.lsap = llc_ui_autoport(); | |
273 | if (!llc->laddr.lsap) | |
274 | goto out; | |
275 | rc = -EBUSY; /* some other network layer is using the sap */ | |
276 | sap = llc_sap_open(llc->laddr.lsap, NULL); | |
277 | if (!sap) | |
278 | goto out; | |
279 | memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN); | |
280 | memcpy(&llc->addr, addr, sizeof(llc->addr)); | |
281 | /* assign new connection to its SAP */ | |
282 | llc_sap_add_socket(sap, sk); | |
283 | sock_reset_flag(sk, SOCK_ZAPPED); | |
284 | rc = 0; | |
285 | out: | |
286 | return rc; | |
287 | } | |
288 | ||
289 | /** | |
290 | * llc_ui_bind - bind a socket to a specific address. | |
291 | * @sock: Socket to bind an address to. | |
292 | * @uaddr: Address the user wants the socket bound to. | |
293 | * @addrlen: Length of the uaddr structure. | |
294 | * | |
295 | * Bind a socket to a specific address. For llc a user is able to bind to | |
5a770c02 | 296 | * a specific sap only or mac + sap. |
1da177e4 LT |
297 | * If the user desires to bind to a specific mac + sap, it is possible to |
298 | * have multiple sap connections via multiple macs. | |
299 | * Bind and autobind for that matter must enforce the correct sap usage | |
300 | * otherwise all hell will break loose. | |
301 | * Returns: 0 upon success, negative otherwise. | |
302 | */ | |
303 | static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen) | |
304 | { | |
305 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; | |
306 | struct sock *sk = sock->sk; | |
307 | struct llc_sock *llc = llc_sk(sk); | |
308 | struct llc_sap *sap; | |
309 | int rc = -EINVAL; | |
310 | ||
0dc47877 | 311 | dprintk("%s: binding %02X\n", __func__, addr->sllc_sap); |
af426d32 | 312 | if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr))) |
1da177e4 LT |
313 | goto out; |
314 | rc = -EAFNOSUPPORT; | |
af426d32 | 315 | if (unlikely(addr->sllc_family != AF_LLC)) |
1da177e4 | 316 | goto out; |
cf309e3f | 317 | rc = -ENODEV; |
941666c2 | 318 | rcu_read_lock(); |
abf9d537 | 319 | if (sk->sk_bound_dev_if) { |
941666c2 | 320 | llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if); |
abf9d537 OP |
321 | if (llc->dev) { |
322 | if (!addr->sllc_arphrd) | |
323 | addr->sllc_arphrd = llc->dev->type; | |
324 | if (llc_mac_null(addr->sllc_mac)) | |
325 | memcpy(addr->sllc_mac, llc->dev->dev_addr, | |
326 | IFHWADDRLEN); | |
327 | if (addr->sllc_arphrd != llc->dev->type || | |
328 | !llc_mac_match(addr->sllc_mac, | |
329 | llc->dev->dev_addr)) { | |
330 | rc = -EINVAL; | |
abf9d537 OP |
331 | llc->dev = NULL; |
332 | } | |
333 | } | |
334 | } else | |
941666c2 | 335 | llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd, |
abf9d537 | 336 | addr->sllc_mac); |
941666c2 ED |
337 | if (llc->dev) |
338 | dev_hold(llc->dev); | |
339 | rcu_read_unlock(); | |
cf309e3f JF |
340 | if (!llc->dev) |
341 | goto out; | |
1da177e4 LT |
342 | if (!addr->sllc_sap) { |
343 | rc = -EUSERS; | |
344 | addr->sllc_sap = llc_ui_autoport(); | |
345 | if (!addr->sllc_sap) | |
346 | goto out; | |
347 | } | |
348 | sap = llc_sap_find(addr->sllc_sap); | |
349 | if (!sap) { | |
350 | sap = llc_sap_open(addr->sllc_sap, NULL); | |
351 | rc = -EBUSY; /* some other network layer is using the sap */ | |
352 | if (!sap) | |
353 | goto out; | |
354 | } else { | |
355 | struct llc_addr laddr, daddr; | |
356 | struct sock *ask; | |
357 | ||
358 | memset(&laddr, 0, sizeof(laddr)); | |
359 | memset(&daddr, 0, sizeof(daddr)); | |
360 | /* | |
59c51591 | 361 | * FIXME: check if the address is multicast, |
1da177e4 LT |
362 | * only SOCK_DGRAM can do this. |
363 | */ | |
364 | memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
365 | laddr.lsap = addr->sllc_sap; | |
366 | rc = -EADDRINUSE; /* mac + sap clash. */ | |
367 | ask = llc_lookup_established(sap, &daddr, &laddr); | |
368 | if (ask) { | |
369 | sock_put(ask); | |
6e2144b7 | 370 | goto out_put; |
1da177e4 LT |
371 | } |
372 | } | |
373 | llc->laddr.lsap = addr->sllc_sap; | |
374 | memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
375 | memcpy(&llc->addr, addr, sizeof(llc->addr)); | |
376 | /* assign new connection to its SAP */ | |
377 | llc_sap_add_socket(sap, sk); | |
378 | sock_reset_flag(sk, SOCK_ZAPPED); | |
379 | rc = 0; | |
6e2144b7 ACM |
380 | out_put: |
381 | llc_sap_put(sap); | |
1da177e4 LT |
382 | out: |
383 | return rc; | |
384 | } | |
385 | ||
386 | /** | |
387 | * llc_ui_shutdown - shutdown a connect llc2 socket. | |
388 | * @sock: Socket to shutdown. | |
389 | * @how: What part of the socket to shutdown. | |
390 | * | |
391 | * Shutdown a connected llc2 socket. Currently this function only supports | |
392 | * shutting down both sends and receives (2), we could probably make this | |
393 | * function such that a user can shutdown only half the connection but not | |
394 | * right now. | |
395 | * Returns: 0 upon success, negative otherwise. | |
396 | */ | |
397 | static int llc_ui_shutdown(struct socket *sock, int how) | |
398 | { | |
399 | struct sock *sk = sock->sk; | |
400 | int rc = -ENOTCONN; | |
401 | ||
402 | lock_sock(sk); | |
af426d32 | 403 | if (unlikely(sk->sk_state != TCP_ESTABLISHED)) |
1da177e4 LT |
404 | goto out; |
405 | rc = -EINVAL; | |
406 | if (how != 2) | |
407 | goto out; | |
408 | rc = llc_send_disc(sk); | |
409 | if (!rc) | |
410 | rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); | |
411 | /* Wake up anyone sleeping in poll */ | |
412 | sk->sk_state_change(sk); | |
413 | out: | |
414 | release_sock(sk); | |
415 | return rc; | |
416 | } | |
417 | ||
418 | /** | |
419 | * llc_ui_connect - Connect to a remote llc2 mac + sap. | |
420 | * @sock: Socket which will be connected to the remote destination. | |
421 | * @uaddr: Remote and possibly the local address of the new connection. | |
422 | * @addrlen: Size of uaddr structure. | |
423 | * @flags: Operational flags specified by the user. | |
424 | * | |
425 | * Connect to a remote llc2 mac + sap. The caller must specify the | |
426 | * destination mac and address to connect to. If the user hasn't previously | |
427 | * called bind(2) with a smac the address of the first interface of the | |
428 | * specified arp type will be used. | |
429 | * This function will autobind if user did not previously call bind. | |
430 | * Returns: 0 upon success, negative otherwise. | |
431 | */ | |
432 | static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr, | |
433 | int addrlen, int flags) | |
434 | { | |
435 | struct sock *sk = sock->sk; | |
436 | struct llc_sock *llc = llc_sk(sk); | |
437 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; | |
1da177e4 LT |
438 | int rc = -EINVAL; |
439 | ||
440 | lock_sock(sk); | |
af426d32 | 441 | if (unlikely(addrlen != sizeof(*addr))) |
1da177e4 LT |
442 | goto out; |
443 | rc = -EAFNOSUPPORT; | |
af426d32 ACM |
444 | if (unlikely(addr->sllc_family != AF_LLC)) |
445 | goto out; | |
446 | if (unlikely(sk->sk_type != SOCK_STREAM)) | |
447 | goto out; | |
448 | rc = -EALREADY; | |
449 | if (unlikely(sock->state == SS_CONNECTING)) | |
1da177e4 LT |
450 | goto out; |
451 | /* bind connection to sap if user hasn't done it. */ | |
452 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
453 | /* bind to sap with null dev, exclusive */ | |
454 | rc = llc_ui_autobind(sock, addr); | |
455 | if (rc) | |
456 | goto out; | |
1da177e4 | 457 | } |
5564af21 JF |
458 | llc->daddr.lsap = addr->sllc_sap; |
459 | memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
1da177e4 LT |
460 | sock->state = SS_CONNECTING; |
461 | sk->sk_state = TCP_SYN_SENT; | |
462 | llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap); | |
774ccb4f | 463 | rc = llc_establish_connection(sk, llc->dev->dev_addr, |
1da177e4 LT |
464 | addr->sllc_mac, addr->sllc_sap); |
465 | if (rc) { | |
0dc47877 | 466 | dprintk("%s: llc_ui_send_conn failed :-(\n", __func__); |
1da177e4 LT |
467 | sock->state = SS_UNCONNECTED; |
468 | sk->sk_state = TCP_CLOSE; | |
469 | goto out; | |
470 | } | |
b35bd110 ACM |
471 | |
472 | if (sk->sk_state == TCP_SYN_SENT) { | |
54fb7f25 | 473 | const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
b35bd110 ACM |
474 | |
475 | if (!timeo || !llc_ui_wait_for_conn(sk, timeo)) | |
476 | goto out; | |
477 | ||
478 | rc = sock_intr_errno(timeo); | |
479 | if (signal_pending(current)) | |
480 | goto out; | |
481 | } | |
482 | ||
483 | if (sk->sk_state == TCP_CLOSE) | |
484 | goto sock_error; | |
485 | ||
486 | sock->state = SS_CONNECTED; | |
487 | rc = 0; | |
1da177e4 LT |
488 | out: |
489 | release_sock(sk); | |
490 | return rc; | |
b35bd110 ACM |
491 | sock_error: |
492 | rc = sock_error(sk) ? : -ECONNABORTED; | |
493 | sock->state = SS_UNCONNECTED; | |
494 | goto out; | |
1da177e4 LT |
495 | } |
496 | ||
497 | /** | |
498 | * llc_ui_listen - allow a normal socket to accept incoming connections | |
499 | * @sock: Socket to allow incoming connections on. | |
500 | * @backlog: Number of connections to queue. | |
501 | * | |
502 | * Allow a normal socket to accept incoming connections. | |
503 | * Returns 0 upon success, negative otherwise. | |
504 | */ | |
505 | static int llc_ui_listen(struct socket *sock, int backlog) | |
506 | { | |
507 | struct sock *sk = sock->sk; | |
508 | int rc = -EINVAL; | |
509 | ||
510 | lock_sock(sk); | |
af426d32 | 511 | if (unlikely(sock->state != SS_UNCONNECTED)) |
1da177e4 LT |
512 | goto out; |
513 | rc = -EOPNOTSUPP; | |
af426d32 | 514 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
1da177e4 LT |
515 | goto out; |
516 | rc = -EAGAIN; | |
517 | if (sock_flag(sk, SOCK_ZAPPED)) | |
518 | goto out; | |
519 | rc = 0; | |
95c96174 | 520 | if (!(unsigned int)backlog) /* BSDism */ |
1da177e4 LT |
521 | backlog = 1; |
522 | sk->sk_max_ack_backlog = backlog; | |
523 | if (sk->sk_state != TCP_LISTEN) { | |
524 | sk->sk_ack_backlog = 0; | |
525 | sk->sk_state = TCP_LISTEN; | |
526 | } | |
527 | sk->sk_socket->flags |= __SO_ACCEPTCON; | |
528 | out: | |
529 | release_sock(sk); | |
530 | return rc; | |
531 | } | |
532 | ||
54fb7f25 | 533 | static int llc_ui_wait_for_disc(struct sock *sk, long timeout) |
1da177e4 | 534 | { |
b35bd110 ACM |
535 | DEFINE_WAIT(wait); |
536 | int rc = 0; | |
1da177e4 | 537 | |
54fb7f25 | 538 | while (1) { |
aa395145 | 539 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
54fb7f25 ACM |
540 | if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE)) |
541 | break; | |
1da177e4 LT |
542 | rc = -ERESTARTSYS; |
543 | if (signal_pending(current)) | |
544 | break; | |
545 | rc = -EAGAIN; | |
546 | if (!timeout) | |
547 | break; | |
b35bd110 | 548 | rc = 0; |
1da177e4 | 549 | } |
aa395145 | 550 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
551 | return rc; |
552 | } | |
553 | ||
54fb7f25 | 554 | static int llc_ui_wait_for_conn(struct sock *sk, long timeout) |
1da177e4 | 555 | { |
b35bd110 | 556 | DEFINE_WAIT(wait); |
1da177e4 | 557 | |
54fb7f25 | 558 | while (1) { |
aa395145 | 559 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
54fb7f25 ACM |
560 | if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT)) |
561 | break; | |
b35bd110 | 562 | if (signal_pending(current) || !timeout) |
1da177e4 LT |
563 | break; |
564 | } | |
aa395145 | 565 | finish_wait(sk_sleep(sk), &wait); |
b35bd110 | 566 | return timeout; |
1da177e4 LT |
567 | } |
568 | ||
afdbe357 | 569 | static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout) |
1da177e4 | 570 | { |
b35bd110 | 571 | DEFINE_WAIT(wait); |
afdbe357 ACM |
572 | struct llc_sock *llc = llc_sk(sk); |
573 | int rc; | |
1da177e4 | 574 | |
54fb7f25 | 575 | while (1) { |
aa395145 | 576 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
afdbe357 | 577 | rc = 0; |
54fb7f25 ACM |
578 | if (sk_wait_event(sk, &timeout, |
579 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
afdbe357 | 580 | (!llc_data_accept_state(llc->state) && |
451677c4 | 581 | !llc->remote_busy_flag && |
afdbe357 | 582 | !llc->p_flag))) |
1da177e4 | 583 | break; |
1da177e4 LT |
584 | rc = -ERESTARTSYS; |
585 | if (signal_pending(current)) | |
586 | break; | |
587 | rc = -EAGAIN; | |
588 | if (!timeout) | |
589 | break; | |
590 | } | |
aa395145 | 591 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
592 | return rc; |
593 | } | |
594 | ||
2928c19e | 595 | static int llc_wait_data(struct sock *sk, long timeo) |
1da177e4 | 596 | { |
1da177e4 LT |
597 | int rc; |
598 | ||
54fb7f25 | 599 | while (1) { |
afdbe357 ACM |
600 | /* |
601 | * POSIX 1003.1g mandates this order. | |
602 | */ | |
c1cbe4b7 BL |
603 | rc = sock_error(sk); |
604 | if (rc) | |
afdbe357 | 605 | break; |
1da177e4 | 606 | rc = 0; |
afdbe357 | 607 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
1da177e4 | 608 | break; |
afdbe357 ACM |
609 | rc = -EAGAIN; |
610 | if (!timeo) | |
611 | break; | |
612 | rc = sock_intr_errno(timeo); | |
1da177e4 LT |
613 | if (signal_pending(current)) |
614 | break; | |
afdbe357 ACM |
615 | rc = 0; |
616 | if (sk_wait_data(sk, &timeo)) | |
1da177e4 LT |
617 | break; |
618 | } | |
1da177e4 LT |
619 | return rc; |
620 | } | |
621 | ||
e5cd6fe3 OP |
622 | static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb) |
623 | { | |
624 | struct llc_sock *llc = llc_sk(skb->sk); | |
625 | ||
626 | if (llc->cmsg_flags & LLC_CMSG_PKTINFO) { | |
627 | struct llc_pktinfo info; | |
628 | ||
629 | info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex; | |
630 | llc_pdu_decode_dsap(skb, &info.lpi_sap); | |
631 | llc_pdu_decode_da(skb, info.lpi_mac); | |
632 | put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info); | |
633 | } | |
634 | } | |
635 | ||
1da177e4 LT |
636 | /** |
637 | * llc_ui_accept - accept a new incoming connection. | |
638 | * @sock: Socket which connections arrive on. | |
639 | * @newsock: Socket to move incoming connection to. | |
640 | * @flags: User specified operational flags. | |
641 | * | |
642 | * Accept a new incoming connection. | |
643 | * Returns 0 upon success, negative otherwise. | |
644 | */ | |
645 | static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags) | |
646 | { | |
647 | struct sock *sk = sock->sk, *newsk; | |
648 | struct llc_sock *llc, *newllc; | |
649 | struct sk_buff *skb; | |
650 | int rc = -EOPNOTSUPP; | |
651 | ||
0dc47877 | 652 | dprintk("%s: accepting on %02X\n", __func__, |
d57b1869 | 653 | llc_sk(sk)->laddr.lsap); |
1da177e4 | 654 | lock_sock(sk); |
af426d32 | 655 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
1da177e4 LT |
656 | goto out; |
657 | rc = -EINVAL; | |
af426d32 ACM |
658 | if (unlikely(sock->state != SS_UNCONNECTED || |
659 | sk->sk_state != TCP_LISTEN)) | |
1da177e4 LT |
660 | goto out; |
661 | /* wait for a connection to arrive. */ | |
b35bd110 | 662 | if (skb_queue_empty(&sk->sk_receive_queue)) { |
afdbe357 | 663 | rc = llc_wait_data(sk, sk->sk_rcvtimeo); |
b35bd110 ACM |
664 | if (rc) |
665 | goto out; | |
666 | } | |
0dc47877 | 667 | dprintk("%s: got a new connection on %02X\n", __func__, |
d57b1869 | 668 | llc_sk(sk)->laddr.lsap); |
1da177e4 LT |
669 | skb = skb_dequeue(&sk->sk_receive_queue); |
670 | rc = -EINVAL; | |
671 | if (!skb->sk) | |
672 | goto frees; | |
673 | rc = 0; | |
674 | newsk = skb->sk; | |
675 | /* attach connection to a new socket. */ | |
676 | llc_ui_sk_init(newsock, newsk); | |
677 | sock_reset_flag(newsk, SOCK_ZAPPED); | |
678 | newsk->sk_state = TCP_ESTABLISHED; | |
679 | newsock->state = SS_CONNECTED; | |
680 | llc = llc_sk(sk); | |
681 | newllc = llc_sk(newsk); | |
682 | memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr)); | |
683 | newllc->link = llc_ui_next_link_no(newllc->laddr.lsap); | |
684 | ||
685 | /* put original socket back into a clean listen state. */ | |
686 | sk->sk_state = TCP_LISTEN; | |
687 | sk->sk_ack_backlog--; | |
0dc47877 | 688 | dprintk("%s: ok success on %02X, client on %02X\n", __func__, |
1da177e4 LT |
689 | llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap); |
690 | frees: | |
691 | kfree_skb(skb); | |
692 | out: | |
693 | release_sock(sk); | |
694 | return rc; | |
695 | } | |
696 | ||
697 | /** | |
698 | * llc_ui_recvmsg - copy received data to the socket user. | |
699 | * @sock: Socket to copy data from. | |
700 | * @msg: Various user space related information. | |
8420e1b5 | 701 | * @len: Size of user buffer. |
1da177e4 LT |
702 | * @flags: User specified flags. |
703 | * | |
704 | * Copy received data to the socket user. | |
705 | * Returns non-negative upon success, negative otherwise. | |
706 | */ | |
707 | static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock, | |
8420e1b5 | 708 | struct msghdr *msg, size_t len, int flags) |
1da177e4 | 709 | { |
1da177e4 | 710 | struct sockaddr_llc *uaddr = (struct sockaddr_llc *)msg->msg_name; |
8420e1b5 ACM |
711 | const int nonblock = flags & MSG_DONTWAIT; |
712 | struct sk_buff *skb = NULL; | |
713 | struct sock *sk = sock->sk; | |
714 | struct llc_sock *llc = llc_sk(sk); | |
56ac11cf | 715 | unsigned long cpu_flags; |
1da177e4 | 716 | size_t copied = 0; |
8420e1b5 ACM |
717 | u32 peek_seq = 0; |
718 | u32 *seq; | |
719 | unsigned long used; | |
720 | int target; /* Read at least this many bytes */ | |
721 | long timeo; | |
1da177e4 | 722 | |
c77a4b9c MK |
723 | msg->msg_namelen = 0; |
724 | ||
1da177e4 | 725 | lock_sock(sk); |
8420e1b5 | 726 | copied = -ENOTCONN; |
29efcd26 | 727 | if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN)) |
1da177e4 | 728 | goto out; |
8420e1b5 ACM |
729 | |
730 | timeo = sock_rcvtimeo(sk, nonblock); | |
731 | ||
732 | seq = &llc->copied_seq; | |
733 | if (flags & MSG_PEEK) { | |
734 | peek_seq = llc->copied_seq; | |
735 | seq = &peek_seq; | |
d57b1869 | 736 | } |
8420e1b5 ACM |
737 | |
738 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
739 | copied = 0; | |
740 | ||
741 | do { | |
742 | u32 offset; | |
743 | ||
744 | /* | |
745 | * We need to check signals first, to get correct SIGURG | |
746 | * handling. FIXME: Need to check this doesn't impact 1003.1g | |
747 | * and move it down to the bottom of the loop | |
748 | */ | |
749 | if (signal_pending(current)) { | |
750 | if (copied) | |
751 | break; | |
752 | copied = timeo ? sock_intr_errno(timeo) : -EAGAIN; | |
753 | break; | |
754 | } | |
755 | ||
756 | /* Next get a buffer. */ | |
757 | ||
758 | skb = skb_peek(&sk->sk_receive_queue); | |
759 | if (skb) { | |
760 | offset = *seq; | |
761 | goto found_ok_skb; | |
762 | } | |
763 | /* Well, if we have backlog, try to process it now yet. */ | |
764 | ||
765 | if (copied >= target && !sk->sk_backlog.tail) | |
766 | break; | |
767 | ||
768 | if (copied) { | |
769 | if (sk->sk_err || | |
770 | sk->sk_state == TCP_CLOSE || | |
771 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
772 | !timeo || | |
773 | (flags & MSG_PEEK)) | |
774 | break; | |
775 | } else { | |
776 | if (sock_flag(sk, SOCK_DONE)) | |
777 | break; | |
778 | ||
779 | if (sk->sk_err) { | |
780 | copied = sock_error(sk); | |
781 | break; | |
782 | } | |
783 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
784 | break; | |
785 | ||
29efcd26 | 786 | if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) { |
8420e1b5 ACM |
787 | if (!sock_flag(sk, SOCK_DONE)) { |
788 | /* | |
789 | * This occurs when user tries to read | |
790 | * from never connected socket. | |
791 | */ | |
792 | copied = -ENOTCONN; | |
793 | break; | |
794 | } | |
795 | break; | |
796 | } | |
797 | if (!timeo) { | |
798 | copied = -EAGAIN; | |
799 | break; | |
800 | } | |
801 | } | |
802 | ||
803 | if (copied >= target) { /* Do not sleep, just process backlog. */ | |
804 | release_sock(sk); | |
805 | lock_sock(sk); | |
806 | } else | |
807 | sk_wait_data(sk, &timeo); | |
808 | ||
809 | if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) { | |
e87cc472 JP |
810 | net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n", |
811 | current->comm, | |
812 | task_pid_nr(current)); | |
8420e1b5 ACM |
813 | peek_seq = llc->copied_seq; |
814 | } | |
815 | continue; | |
816 | found_ok_skb: | |
817 | /* Ok so how much can we use? */ | |
818 | used = skb->len - offset; | |
819 | if (len < used) | |
820 | used = len; | |
821 | ||
822 | if (!(flags & MSG_TRUNC)) { | |
823 | int rc = skb_copy_datagram_iovec(skb, offset, | |
824 | msg->msg_iov, used); | |
825 | if (rc) { | |
826 | /* Exception. Bailout! */ | |
827 | if (!copied) | |
828 | copied = -EFAULT; | |
829 | break; | |
830 | } | |
831 | } | |
832 | ||
833 | *seq += used; | |
834 | copied += used; | |
835 | len -= used; | |
836 | ||
9cef310f AJ |
837 | /* For non stream protcols we get one packet per recvmsg call */ |
838 | if (sk->sk_type != SOCK_STREAM) | |
839 | goto copy_uaddr; | |
840 | ||
8420e1b5 | 841 | if (!(flags & MSG_PEEK)) { |
56ac11cf | 842 | spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags); |
dc6b9b78 | 843 | sk_eat_skb(sk, skb, false); |
56ac11cf | 844 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags); |
8420e1b5 ACM |
845 | *seq = 0; |
846 | } | |
30a584d9 | 847 | |
30a584d9 SH |
848 | /* Partial read */ |
849 | if (used + offset < skb->len) | |
850 | continue; | |
8420e1b5 ACM |
851 | } while (len > 0); |
852 | ||
1da177e4 LT |
853 | out: |
854 | release_sock(sk); | |
8420e1b5 ACM |
855 | return copied; |
856 | copy_uaddr: | |
857 | if (uaddr != NULL && skb != NULL) { | |
858 | memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr)); | |
859 | msg->msg_namelen = sizeof(*uaddr); | |
860 | } | |
e5cd6fe3 OP |
861 | if (llc_sk(sk)->cmsg_flags) |
862 | llc_cmsg_rcv(msg, skb); | |
9cef310f AJ |
863 | |
864 | if (!(flags & MSG_PEEK)) { | |
56ac11cf | 865 | spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags); |
dc6b9b78 | 866 | sk_eat_skb(sk, skb, false); |
56ac11cf | 867 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags); |
9cef310f AJ |
868 | *seq = 0; |
869 | } | |
870 | ||
8420e1b5 | 871 | goto out; |
1da177e4 LT |
872 | } |
873 | ||
874 | /** | |
875 | * llc_ui_sendmsg - Transmit data provided by the socket user. | |
876 | * @sock: Socket to transmit data from. | |
877 | * @msg: Various user related information. | |
878 | * @len: Length of data to transmit. | |
879 | * | |
880 | * Transmit data provided by the socket user. | |
881 | * Returns non-negative upon success, negative otherwise. | |
882 | */ | |
883 | static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock, | |
884 | struct msghdr *msg, size_t len) | |
885 | { | |
886 | struct sock *sk = sock->sk; | |
887 | struct llc_sock *llc = llc_sk(sk); | |
888 | struct sockaddr_llc *addr = (struct sockaddr_llc *)msg->msg_name; | |
889 | int flags = msg->msg_flags; | |
890 | int noblock = flags & MSG_DONTWAIT; | |
1da177e4 LT |
891 | struct sk_buff *skb; |
892 | size_t size = 0; | |
893 | int rc = -EINVAL, copied = 0, hdrlen; | |
894 | ||
0dc47877 | 895 | dprintk("%s: sending from %02X to %02X\n", __func__, |
1da177e4 LT |
896 | llc->laddr.lsap, llc->daddr.lsap); |
897 | lock_sock(sk); | |
898 | if (addr) { | |
899 | if (msg->msg_namelen < sizeof(*addr)) | |
900 | goto release; | |
901 | } else { | |
902 | if (llc_ui_addr_null(&llc->addr)) | |
903 | goto release; | |
904 | addr = &llc->addr; | |
905 | } | |
906 | /* must bind connection to sap if user hasn't done it. */ | |
907 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
908 | /* bind to sap with null dev, exclusive. */ | |
909 | rc = llc_ui_autobind(sock, addr); | |
910 | if (rc) | |
911 | goto release; | |
912 | } | |
774ccb4f | 913 | hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr); |
1da177e4 | 914 | size = hdrlen + len; |
774ccb4f ACM |
915 | if (size > llc->dev->mtu) |
916 | size = llc->dev->mtu; | |
1da177e4 LT |
917 | copied = size - hdrlen; |
918 | release_sock(sk); | |
919 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
920 | lock_sock(sk); | |
921 | if (!skb) | |
922 | goto release; | |
774ccb4f | 923 | skb->dev = llc->dev; |
1da177e4 | 924 | skb->protocol = llc_proto_type(addr->sllc_arphrd); |
d57b1869 | 925 | skb_reserve(skb, hdrlen); |
1da177e4 LT |
926 | rc = memcpy_fromiovec(skb_put(skb, copied), msg->msg_iov, copied); |
927 | if (rc) | |
928 | goto out; | |
929 | if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) { | |
930 | llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac, | |
931 | addr->sllc_sap); | |
932 | goto out; | |
933 | } | |
934 | if (addr->sllc_test) { | |
935 | llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac, | |
936 | addr->sllc_sap); | |
937 | goto out; | |
938 | } | |
939 | if (addr->sllc_xid) { | |
940 | llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac, | |
941 | addr->sllc_sap); | |
942 | goto out; | |
943 | } | |
944 | rc = -ENOPROTOOPT; | |
945 | if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua)) | |
946 | goto out; | |
947 | rc = llc_ui_send_data(sk, skb, noblock); | |
1da177e4 | 948 | out: |
249ff1c6 | 949 | if (rc) { |
1da177e4 LT |
950 | kfree_skb(skb); |
951 | release: | |
1da177e4 | 952 | dprintk("%s: failed sending from %02X to %02X: %d\n", |
0dc47877 | 953 | __func__, llc->laddr.lsap, llc->daddr.lsap, rc); |
249ff1c6 | 954 | } |
1da177e4 LT |
955 | release_sock(sk); |
956 | return rc ? : copied; | |
957 | } | |
958 | ||
959 | /** | |
960 | * llc_ui_getname - return the address info of a socket | |
961 | * @sock: Socket to get address of. | |
962 | * @uaddr: Address structure to return information. | |
963 | * @uaddrlen: Length of address structure. | |
964 | * @peer: Does user want local or remote address information. | |
965 | * | |
966 | * Return the address information of a socket. | |
967 | */ | |
968 | static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr, | |
969 | int *uaddrlen, int peer) | |
970 | { | |
971 | struct sockaddr_llc sllc; | |
972 | struct sock *sk = sock->sk; | |
973 | struct llc_sock *llc = llc_sk(sk); | |
3592aaeb | 974 | int rc = -EBADF; |
1da177e4 | 975 | |
28e9fc59 | 976 | memset(&sllc, 0, sizeof(sllc)); |
1da177e4 LT |
977 | lock_sock(sk); |
978 | if (sock_flag(sk, SOCK_ZAPPED)) | |
979 | goto out; | |
980 | *uaddrlen = sizeof(sllc); | |
1da177e4 LT |
981 | if (peer) { |
982 | rc = -ENOTCONN; | |
983 | if (sk->sk_state != TCP_ESTABLISHED) | |
984 | goto out; | |
985 | if(llc->dev) | |
986 | sllc.sllc_arphrd = llc->dev->type; | |
987 | sllc.sllc_sap = llc->daddr.lsap; | |
988 | memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN); | |
989 | } else { | |
990 | rc = -EINVAL; | |
991 | if (!llc->sap) | |
992 | goto out; | |
993 | sllc.sllc_sap = llc->sap->laddr.lsap; | |
994 | ||
995 | if (llc->dev) { | |
996 | sllc.sllc_arphrd = llc->dev->type; | |
a186d2ae | 997 | memcpy(&sllc.sllc_mac, llc->dev->dev_addr, |
1da177e4 LT |
998 | IFHWADDRLEN); |
999 | } | |
1000 | } | |
1001 | rc = 0; | |
1002 | sllc.sllc_family = AF_LLC; | |
1003 | memcpy(uaddr, &sllc, sizeof(sllc)); | |
1004 | out: | |
1005 | release_sock(sk); | |
1006 | return rc; | |
1007 | } | |
1008 | ||
1009 | /** | |
1010 | * llc_ui_ioctl - io controls for PF_LLC | |
1011 | * @sock: Socket to get/set info | |
1012 | * @cmd: command | |
1013 | * @arg: optional argument for cmd | |
1014 | * | |
1015 | * get/set info on llc sockets | |
1016 | */ | |
1017 | static int llc_ui_ioctl(struct socket *sock, unsigned int cmd, | |
1018 | unsigned long arg) | |
1019 | { | |
b5e5fa5e | 1020 | return -ENOIOCTLCMD; |
1da177e4 LT |
1021 | } |
1022 | ||
1023 | /** | |
1024 | * llc_ui_setsockopt - set various connection specific parameters. | |
1025 | * @sock: Socket to set options on. | |
1026 | * @level: Socket level user is requesting operations on. | |
1027 | * @optname: Operation name. | |
2c53040f | 1028 | * @optval: User provided operation data. |
1da177e4 LT |
1029 | * @optlen: Length of optval. |
1030 | * | |
1031 | * Set various connection specific parameters. | |
1032 | */ | |
1033 | static int llc_ui_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1034 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
1035 | { |
1036 | struct sock *sk = sock->sk; | |
1037 | struct llc_sock *llc = llc_sk(sk); | |
339db11b DC |
1038 | unsigned int opt; |
1039 | int rc = -EINVAL; | |
1da177e4 LT |
1040 | |
1041 | lock_sock(sk); | |
af426d32 | 1042 | if (unlikely(level != SOL_LLC || optlen != sizeof(int))) |
1da177e4 LT |
1043 | goto out; |
1044 | rc = get_user(opt, (int __user *)optval); | |
1045 | if (rc) | |
1046 | goto out; | |
1047 | rc = -EINVAL; | |
1048 | switch (optname) { | |
1049 | case LLC_OPT_RETRY: | |
1050 | if (opt > LLC_OPT_MAX_RETRY) | |
1051 | goto out; | |
1052 | llc->n2 = opt; | |
1053 | break; | |
1054 | case LLC_OPT_SIZE: | |
1055 | if (opt > LLC_OPT_MAX_SIZE) | |
1056 | goto out; | |
1057 | llc->n1 = opt; | |
1058 | break; | |
1059 | case LLC_OPT_ACK_TMR_EXP: | |
1060 | if (opt > LLC_OPT_MAX_ACK_TMR_EXP) | |
1061 | goto out; | |
590232a7 | 1062 | llc->ack_timer.expire = opt * HZ; |
1da177e4 LT |
1063 | break; |
1064 | case LLC_OPT_P_TMR_EXP: | |
1065 | if (opt > LLC_OPT_MAX_P_TMR_EXP) | |
1066 | goto out; | |
590232a7 | 1067 | llc->pf_cycle_timer.expire = opt * HZ; |
1da177e4 LT |
1068 | break; |
1069 | case LLC_OPT_REJ_TMR_EXP: | |
1070 | if (opt > LLC_OPT_MAX_REJ_TMR_EXP) | |
1071 | goto out; | |
590232a7 | 1072 | llc->rej_sent_timer.expire = opt * HZ; |
1da177e4 LT |
1073 | break; |
1074 | case LLC_OPT_BUSY_TMR_EXP: | |
1075 | if (opt > LLC_OPT_MAX_BUSY_TMR_EXP) | |
1076 | goto out; | |
590232a7 | 1077 | llc->busy_state_timer.expire = opt * HZ; |
1da177e4 LT |
1078 | break; |
1079 | case LLC_OPT_TX_WIN: | |
1080 | if (opt > LLC_OPT_MAX_WIN) | |
1081 | goto out; | |
1082 | llc->k = opt; | |
1083 | break; | |
1084 | case LLC_OPT_RX_WIN: | |
1085 | if (opt > LLC_OPT_MAX_WIN) | |
1086 | goto out; | |
1087 | llc->rw = opt; | |
1088 | break; | |
e5cd6fe3 OP |
1089 | case LLC_OPT_PKTINFO: |
1090 | if (opt) | |
1091 | llc->cmsg_flags |= LLC_CMSG_PKTINFO; | |
1092 | else | |
1093 | llc->cmsg_flags &= ~LLC_CMSG_PKTINFO; | |
1094 | break; | |
1da177e4 LT |
1095 | default: |
1096 | rc = -ENOPROTOOPT; | |
1097 | goto out; | |
1098 | } | |
1099 | rc = 0; | |
1100 | out: | |
1101 | release_sock(sk); | |
1102 | return rc; | |
1103 | } | |
1104 | ||
1105 | /** | |
1106 | * llc_ui_getsockopt - get connection specific socket info | |
1107 | * @sock: Socket to get information from. | |
1108 | * @level: Socket level user is requesting operations on. | |
1109 | * @optname: Operation name. | |
1110 | * @optval: Variable to return operation data in. | |
1111 | * @optlen: Length of optval. | |
1112 | * | |
1113 | * Get connection specific socket information. | |
1114 | */ | |
1115 | static int llc_ui_getsockopt(struct socket *sock, int level, int optname, | |
1116 | char __user *optval, int __user *optlen) | |
1117 | { | |
1118 | struct sock *sk = sock->sk; | |
1119 | struct llc_sock *llc = llc_sk(sk); | |
1120 | int val = 0, len = 0, rc = -EINVAL; | |
1121 | ||
1122 | lock_sock(sk); | |
af426d32 | 1123 | if (unlikely(level != SOL_LLC)) |
1da177e4 LT |
1124 | goto out; |
1125 | rc = get_user(len, optlen); | |
1126 | if (rc) | |
1127 | goto out; | |
1128 | rc = -EINVAL; | |
1129 | if (len != sizeof(int)) | |
1130 | goto out; | |
1131 | switch (optname) { | |
1132 | case LLC_OPT_RETRY: | |
590232a7 | 1133 | val = llc->n2; break; |
1da177e4 | 1134 | case LLC_OPT_SIZE: |
590232a7 | 1135 | val = llc->n1; break; |
1da177e4 | 1136 | case LLC_OPT_ACK_TMR_EXP: |
590232a7 | 1137 | val = llc->ack_timer.expire / HZ; break; |
1da177e4 | 1138 | case LLC_OPT_P_TMR_EXP: |
590232a7 | 1139 | val = llc->pf_cycle_timer.expire / HZ; break; |
1da177e4 | 1140 | case LLC_OPT_REJ_TMR_EXP: |
590232a7 | 1141 | val = llc->rej_sent_timer.expire / HZ; break; |
1da177e4 | 1142 | case LLC_OPT_BUSY_TMR_EXP: |
590232a7 | 1143 | val = llc->busy_state_timer.expire / HZ; break; |
1da177e4 LT |
1144 | case LLC_OPT_TX_WIN: |
1145 | val = llc->k; break; | |
1146 | case LLC_OPT_RX_WIN: | |
1147 | val = llc->rw; break; | |
e5cd6fe3 OP |
1148 | case LLC_OPT_PKTINFO: |
1149 | val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0; | |
1150 | break; | |
1da177e4 LT |
1151 | default: |
1152 | rc = -ENOPROTOOPT; | |
1153 | goto out; | |
1154 | } | |
1155 | rc = 0; | |
1156 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) | |
1157 | rc = -EFAULT; | |
1158 | out: | |
1159 | release_sock(sk); | |
1160 | return rc; | |
1161 | } | |
1162 | ||
ec1b4cf7 | 1163 | static const struct net_proto_family llc_ui_family_ops = { |
1da177e4 LT |
1164 | .family = PF_LLC, |
1165 | .create = llc_ui_create, | |
1166 | .owner = THIS_MODULE, | |
1167 | }; | |
1168 | ||
90ddc4f0 | 1169 | static const struct proto_ops llc_ui_ops = { |
1da177e4 LT |
1170 | .family = PF_LLC, |
1171 | .owner = THIS_MODULE, | |
1172 | .release = llc_ui_release, | |
1173 | .bind = llc_ui_bind, | |
1174 | .connect = llc_ui_connect, | |
1175 | .socketpair = sock_no_socketpair, | |
1176 | .accept = llc_ui_accept, | |
1177 | .getname = llc_ui_getname, | |
1178 | .poll = datagram_poll, | |
1179 | .ioctl = llc_ui_ioctl, | |
1180 | .listen = llc_ui_listen, | |
1181 | .shutdown = llc_ui_shutdown, | |
1182 | .setsockopt = llc_ui_setsockopt, | |
1183 | .getsockopt = llc_ui_getsockopt, | |
1184 | .sendmsg = llc_ui_sendmsg, | |
1185 | .recvmsg = llc_ui_recvmsg, | |
1186 | .mmap = sock_no_mmap, | |
1187 | .sendpage = sock_no_sendpage, | |
1188 | }; | |
1189 | ||
01af4a0e | 1190 | static const char llc_proc_err_msg[] __initconst = |
d57b1869 | 1191 | KERN_CRIT "LLC: Unable to register the proc_fs entries\n"; |
01af4a0e | 1192 | static const char llc_sysctl_err_msg[] __initconst = |
d57b1869 | 1193 | KERN_CRIT "LLC: Unable to register the sysctl entries\n"; |
01af4a0e | 1194 | static const char llc_sock_err_msg[] __initconst = |
d57b1869 | 1195 | KERN_CRIT "LLC: Unable to register the network family\n"; |
590232a7 | 1196 | |
1da177e4 LT |
1197 | static int __init llc2_init(void) |
1198 | { | |
1199 | int rc = proto_register(&llc_proto, 0); | |
1200 | ||
1201 | if (rc != 0) | |
1202 | goto out; | |
1203 | ||
1204 | llc_build_offset_table(); | |
1205 | llc_station_init(); | |
1206 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; | |
1207 | rc = llc_proc_init(); | |
590232a7 ACM |
1208 | if (rc != 0) { |
1209 | printk(llc_proc_err_msg); | |
f4f8720f | 1210 | goto out_station; |
590232a7 ACM |
1211 | } |
1212 | rc = llc_sysctl_init(); | |
1213 | if (rc) { | |
1214 | printk(llc_sysctl_err_msg); | |
1215 | goto out_proc; | |
1216 | } | |
1217 | rc = sock_register(&llc_ui_family_ops); | |
1218 | if (rc) { | |
1219 | printk(llc_sock_err_msg); | |
1220 | goto out_sysctl; | |
1221 | } | |
1da177e4 LT |
1222 | llc_add_pack(LLC_DEST_SAP, llc_sap_handler); |
1223 | llc_add_pack(LLC_DEST_CONN, llc_conn_handler); | |
1224 | out: | |
1225 | return rc; | |
590232a7 ACM |
1226 | out_sysctl: |
1227 | llc_sysctl_exit(); | |
1228 | out_proc: | |
1229 | llc_proc_exit(); | |
f4f8720f BH |
1230 | out_station: |
1231 | llc_station_exit(); | |
1da177e4 LT |
1232 | proto_unregister(&llc_proto); |
1233 | goto out; | |
1234 | } | |
1235 | ||
1236 | static void __exit llc2_exit(void) | |
1237 | { | |
1238 | llc_station_exit(); | |
1239 | llc_remove_pack(LLC_DEST_SAP); | |
1240 | llc_remove_pack(LLC_DEST_CONN); | |
1241 | sock_unregister(PF_LLC); | |
1242 | llc_proc_exit(); | |
590232a7 | 1243 | llc_sysctl_exit(); |
1da177e4 LT |
1244 | proto_unregister(&llc_proto); |
1245 | } | |
1246 | ||
1247 | module_init(llc2_init); | |
1248 | module_exit(llc2_exit); | |
1249 | ||
1250 | MODULE_LICENSE("GPL"); | |
1251 | MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003"); | |
1252 | MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support"); | |
1253 | MODULE_ALIAS_NETPROTO(PF_LLC); |