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Commit | Line | Data |
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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> |
174cd4b1 IM |
29 | #include <linux/sched/signal.h> |
30 | ||
1da177e4 LT |
31 | #include <net/llc.h> |
32 | #include <net/llc_sap.h> | |
33 | #include <net/llc_pdu.h> | |
34 | #include <net/llc_conn.h> | |
c752f073 | 35 | #include <net/tcp_states.h> |
1da177e4 LT |
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; | |
90ddc4f0 | 41 | static const struct proto_ops llc_ui_ops; |
1da177e4 | 42 | |
5ff904d5 | 43 | static bool llc_ui_wait_for_conn(struct sock *sk, long timeout); |
54fb7f25 | 44 | static int llc_ui_wait_for_disc(struct sock *sk, long timeout); |
54fb7f25 | 45 | static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout); |
1da177e4 LT |
46 | |
47 | #if 0 | |
48 | #define dprintk(args...) printk(KERN_DEBUG args) | |
49 | #else | |
50 | #define dprintk(args...) | |
51 | #endif | |
52 | ||
e5cd6fe3 OP |
53 | /* Maybe we'll add some more in the future. */ |
54 | #define LLC_CMSG_PKTINFO 1 | |
55 | ||
56 | ||
1da177e4 LT |
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 | */ | |
2342c990 | 63 | static inline u16 llc_ui_next_link_no(int sap) |
1da177e4 LT |
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 | */ | |
3fbd418a | 74 | static inline __be16 llc_proto_type(u16 arphrd) |
1da177e4 | 75 | { |
211ed865 | 76 | return htons(ETH_P_802_2); |
1da177e4 LT |
77 | } |
78 | ||
79 | /** | |
80 | * llc_ui_addr_null - determines if a address structure is null | |
81 | * @addr: Address to test if null. | |
82 | */ | |
2342c990 | 83 | static inline u8 llc_ui_addr_null(struct sockaddr_llc *addr) |
1da177e4 LT |
84 | { |
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 | */ | |
2342c990 | 97 | static inline u8 llc_ui_header_len(struct sock *sk, struct sockaddr_llc *addr) |
1da177e4 LT |
98 | { |
99 | u8 rc = LLC_PDU_LEN_U; | |
100 | ||
101 | if (addr->sllc_test || addr->sllc_xid) | |
102 | rc = LLC_PDU_LEN_U; | |
103 | else if (sk->sk_type == SOCK_STREAM) | |
104 | rc = LLC_PDU_LEN_I; | |
105 | return rc; | |
106 | } | |
107 | ||
108 | /** | |
109 | * llc_ui_send_data - send data via reliable llc2 connection | |
110 | * @sk: Connection the socket is using. | |
111 | * @skb: Data the user wishes to send. | |
1da177e4 LT |
112 | * @noblock: can we block waiting for data? |
113 | * | |
114 | * Send data via reliable llc2 connection. | |
115 | * Returns 0 upon success, non-zero if action did not succeed. | |
116 | */ | |
117 | static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock) | |
118 | { | |
119 | struct llc_sock* llc = llc_sk(sk); | |
120 | int rc = 0; | |
121 | ||
d57b1869 | 122 | if (unlikely(llc_data_accept_state(llc->state) || |
451677c4 JF |
123 | llc->remote_busy_flag || |
124 | llc->p_flag)) { | |
54fb7f25 | 125 | long timeout = sock_sndtimeo(sk, noblock); |
1da177e4 LT |
126 | |
127 | rc = llc_ui_wait_for_busy_core(sk, timeout); | |
128 | } | |
249ff1c6 | 129 | if (unlikely(!rc)) |
1da177e4 LT |
130 | rc = llc_build_and_send_pkt(sk, skb); |
131 | return rc; | |
132 | } | |
133 | ||
134 | static void llc_ui_sk_init(struct socket *sock, struct sock *sk) | |
135 | { | |
ee5850de | 136 | sock_graft(sk, sock); |
1da177e4 | 137 | sk->sk_type = sock->type; |
1da177e4 LT |
138 | sock->ops = &llc_ui_ops; |
139 | } | |
140 | ||
141 | static struct proto llc_proto = { | |
9c005e01 | 142 | .name = "LLC", |
1da177e4 LT |
143 | .owner = THIS_MODULE, |
144 | .obj_size = sizeof(struct llc_sock), | |
5f0d5a3a | 145 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
1da177e4 LT |
146 | }; |
147 | ||
148 | /** | |
149 | * llc_ui_create - alloc and init a new llc_ui socket | |
3f378b68 | 150 | * @net: network namespace (must be default network) |
1da177e4 LT |
151 | * @sock: Socket to initialize and attach allocated sk to. |
152 | * @protocol: Unused. | |
3f378b68 | 153 | * @kern: on behalf of kernel or userspace |
1da177e4 LT |
154 | * |
155 | * Allocate and initialize a new llc_ui socket, validate the user wants a | |
156 | * socket type we have available. | |
157 | * Returns 0 upon success, negative upon failure. | |
158 | */ | |
3f378b68 EP |
159 | static int llc_ui_create(struct net *net, struct socket *sock, int protocol, |
160 | int kern) | |
1da177e4 LT |
161 | { |
162 | struct sock *sk; | |
163 | int rc = -ESOCKTNOSUPPORT; | |
164 | ||
df008c91 | 165 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
3480c63b PM |
166 | return -EPERM; |
167 | ||
09ad9bc7 | 168 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
169 | return -EAFNOSUPPORT; |
170 | ||
af426d32 | 171 | if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) { |
1da177e4 | 172 | rc = -ENOMEM; |
11aa9c28 | 173 | sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto, kern); |
1da177e4 LT |
174 | if (sk) { |
175 | rc = 0; | |
176 | llc_ui_sk_init(sock, sk); | |
177 | } | |
178 | } | |
179 | return rc; | |
180 | } | |
181 | ||
182 | /** | |
183 | * llc_ui_release - shutdown socket | |
184 | * @sock: Socket to release. | |
185 | * | |
186 | * Shutdown and deallocate an existing socket. | |
187 | */ | |
188 | static int llc_ui_release(struct socket *sock) | |
189 | { | |
190 | struct sock *sk = sock->sk; | |
191 | struct llc_sock *llc; | |
192 | ||
af426d32 | 193 | if (unlikely(sk == NULL)) |
1da177e4 LT |
194 | goto out; |
195 | sock_hold(sk); | |
196 | lock_sock(sk); | |
197 | llc = llc_sk(sk); | |
0dc47877 | 198 | dprintk("%s: closing local(%02X) remote(%02X)\n", __func__, |
1da177e4 LT |
199 | llc->laddr.lsap, llc->daddr.lsap); |
200 | if (!llc_send_disc(sk)) | |
201 | llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); | |
3a04ce71 CW |
202 | if (!sock_flag(sk, SOCK_ZAPPED)) { |
203 | struct llc_sap *sap = llc->sap; | |
204 | ||
205 | /* Hold this for release_sock(), so that llc_backlog_rcv() | |
206 | * could still use it. | |
207 | */ | |
208 | llc_sap_hold(sap); | |
1da177e4 | 209 | llc_sap_remove_socket(llc->sap, sk); |
3a04ce71 CW |
210 | release_sock(sk); |
211 | llc_sap_put(sap); | |
212 | } else { | |
213 | release_sock(sk); | |
214 | } | |
1da177e4 LT |
215 | if (llc->dev) |
216 | dev_put(llc->dev); | |
217 | sock_put(sk); | |
218 | llc_sk_free(sk); | |
219 | out: | |
220 | return 0; | |
221 | } | |
222 | ||
223 | /** | |
224 | * llc_ui_autoport - provide dynamically allocate SAP number | |
225 | * | |
226 | * Provide the caller with a dynamically allocated SAP number according | |
227 | * to the rules that are set in this function. Returns: 0, upon failure, | |
228 | * SAP number otherwise. | |
229 | */ | |
230 | static int llc_ui_autoport(void) | |
231 | { | |
232 | struct llc_sap *sap; | |
233 | int i, tries = 0; | |
234 | ||
235 | while (tries < LLC_SAP_DYN_TRIES) { | |
236 | for (i = llc_ui_sap_last_autoport; | |
237 | i < LLC_SAP_DYN_STOP; i += 2) { | |
238 | sap = llc_sap_find(i); | |
239 | if (!sap) { | |
240 | llc_ui_sap_last_autoport = i + 2; | |
241 | goto out; | |
242 | } | |
6e2144b7 | 243 | llc_sap_put(sap); |
1da177e4 LT |
244 | } |
245 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; | |
246 | tries++; | |
247 | } | |
248 | i = 0; | |
249 | out: | |
250 | return i; | |
251 | } | |
252 | ||
253 | /** | |
5a770c02 ACM |
254 | * llc_ui_autobind - automatically bind a socket to a sap |
255 | * @sock: socket to bind | |
256 | * @addr: address to connect to | |
257 | * | |
258 | * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't | |
259 | * specifically used llc_ui_bind to bind to an specific address/sap | |
1da177e4 | 260 | * |
1da177e4 LT |
261 | * Returns: 0 upon success, negative otherwise. |
262 | */ | |
263 | static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr) | |
264 | { | |
265 | struct sock *sk = sock->sk; | |
266 | struct llc_sock *llc = llc_sk(sk); | |
267 | struct llc_sap *sap; | |
268 | int rc = -EINVAL; | |
269 | ||
270 | if (!sock_flag(sk, SOCK_ZAPPED)) | |
271 | goto out; | |
272 | rc = -ENODEV; | |
abf9d537 OP |
273 | if (sk->sk_bound_dev_if) { |
274 | llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if); | |
275 | if (llc->dev && addr->sllc_arphrd != llc->dev->type) { | |
276 | dev_put(llc->dev); | |
277 | llc->dev = NULL; | |
278 | } | |
279 | } else | |
280 | llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd); | |
1da177e4 LT |
281 | if (!llc->dev) |
282 | goto out; | |
283 | rc = -EUSERS; | |
284 | llc->laddr.lsap = llc_ui_autoport(); | |
285 | if (!llc->laddr.lsap) | |
286 | goto out; | |
287 | rc = -EBUSY; /* some other network layer is using the sap */ | |
288 | sap = llc_sap_open(llc->laddr.lsap, NULL); | |
289 | if (!sap) | |
290 | goto out; | |
291 | memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN); | |
292 | memcpy(&llc->addr, addr, sizeof(llc->addr)); | |
293 | /* assign new connection to its SAP */ | |
294 | llc_sap_add_socket(sap, sk); | |
295 | sock_reset_flag(sk, SOCK_ZAPPED); | |
296 | rc = 0; | |
297 | out: | |
298 | return rc; | |
299 | } | |
300 | ||
301 | /** | |
302 | * llc_ui_bind - bind a socket to a specific address. | |
303 | * @sock: Socket to bind an address to. | |
304 | * @uaddr: Address the user wants the socket bound to. | |
305 | * @addrlen: Length of the uaddr structure. | |
306 | * | |
307 | * Bind a socket to a specific address. For llc a user is able to bind to | |
5a770c02 | 308 | * a specific sap only or mac + sap. |
1da177e4 LT |
309 | * If the user desires to bind to a specific mac + sap, it is possible to |
310 | * have multiple sap connections via multiple macs. | |
311 | * Bind and autobind for that matter must enforce the correct sap usage | |
312 | * otherwise all hell will break loose. | |
313 | * Returns: 0 upon success, negative otherwise. | |
314 | */ | |
315 | static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen) | |
316 | { | |
317 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; | |
318 | struct sock *sk = sock->sk; | |
319 | struct llc_sock *llc = llc_sk(sk); | |
320 | struct llc_sap *sap; | |
321 | int rc = -EINVAL; | |
322 | ||
0908cf4d | 323 | lock_sock(sk); |
af426d32 | 324 | if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr))) |
1da177e4 LT |
325 | goto out; |
326 | rc = -EAFNOSUPPORT; | |
af426d32 | 327 | if (unlikely(addr->sllc_family != AF_LLC)) |
1da177e4 | 328 | goto out; |
c68e747d | 329 | dprintk("%s: binding %02X\n", __func__, addr->sllc_sap); |
cf309e3f | 330 | rc = -ENODEV; |
941666c2 | 331 | rcu_read_lock(); |
abf9d537 | 332 | if (sk->sk_bound_dev_if) { |
941666c2 | 333 | llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if); |
abf9d537 OP |
334 | if (llc->dev) { |
335 | if (!addr->sllc_arphrd) | |
336 | addr->sllc_arphrd = llc->dev->type; | |
951fd874 | 337 | if (is_zero_ether_addr(addr->sllc_mac)) |
abf9d537 OP |
338 | memcpy(addr->sllc_mac, llc->dev->dev_addr, |
339 | IFHWADDRLEN); | |
340 | if (addr->sllc_arphrd != llc->dev->type || | |
951fd874 JP |
341 | !ether_addr_equal(addr->sllc_mac, |
342 | llc->dev->dev_addr)) { | |
abf9d537 | 343 | rc = -EINVAL; |
abf9d537 OP |
344 | llc->dev = NULL; |
345 | } | |
346 | } | |
347 | } else | |
941666c2 | 348 | llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd, |
abf9d537 | 349 | addr->sllc_mac); |
941666c2 ED |
350 | if (llc->dev) |
351 | dev_hold(llc->dev); | |
352 | rcu_read_unlock(); | |
cf309e3f JF |
353 | if (!llc->dev) |
354 | goto out; | |
1da177e4 LT |
355 | if (!addr->sllc_sap) { |
356 | rc = -EUSERS; | |
357 | addr->sllc_sap = llc_ui_autoport(); | |
358 | if (!addr->sllc_sap) | |
359 | goto out; | |
360 | } | |
361 | sap = llc_sap_find(addr->sllc_sap); | |
362 | if (!sap) { | |
363 | sap = llc_sap_open(addr->sllc_sap, NULL); | |
364 | rc = -EBUSY; /* some other network layer is using the sap */ | |
365 | if (!sap) | |
366 | goto out; | |
367 | } else { | |
368 | struct llc_addr laddr, daddr; | |
369 | struct sock *ask; | |
370 | ||
371 | memset(&laddr, 0, sizeof(laddr)); | |
372 | memset(&daddr, 0, sizeof(daddr)); | |
373 | /* | |
59c51591 | 374 | * FIXME: check if the address is multicast, |
1da177e4 LT |
375 | * only SOCK_DGRAM can do this. |
376 | */ | |
377 | memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
378 | laddr.lsap = addr->sllc_sap; | |
379 | rc = -EADDRINUSE; /* mac + sap clash. */ | |
380 | ask = llc_lookup_established(sap, &daddr, &laddr); | |
381 | if (ask) { | |
382 | sock_put(ask); | |
6e2144b7 | 383 | goto out_put; |
1da177e4 LT |
384 | } |
385 | } | |
386 | llc->laddr.lsap = addr->sllc_sap; | |
387 | memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
388 | memcpy(&llc->addr, addr, sizeof(llc->addr)); | |
389 | /* assign new connection to its SAP */ | |
390 | llc_sap_add_socket(sap, sk); | |
391 | sock_reset_flag(sk, SOCK_ZAPPED); | |
392 | rc = 0; | |
6e2144b7 ACM |
393 | out_put: |
394 | llc_sap_put(sap); | |
1da177e4 | 395 | out: |
0908cf4d | 396 | release_sock(sk); |
1da177e4 LT |
397 | return rc; |
398 | } | |
399 | ||
400 | /** | |
401 | * llc_ui_shutdown - shutdown a connect llc2 socket. | |
402 | * @sock: Socket to shutdown. | |
403 | * @how: What part of the socket to shutdown. | |
404 | * | |
405 | * Shutdown a connected llc2 socket. Currently this function only supports | |
406 | * shutting down both sends and receives (2), we could probably make this | |
407 | * function such that a user can shutdown only half the connection but not | |
408 | * right now. | |
409 | * Returns: 0 upon success, negative otherwise. | |
410 | */ | |
411 | static int llc_ui_shutdown(struct socket *sock, int how) | |
412 | { | |
413 | struct sock *sk = sock->sk; | |
414 | int rc = -ENOTCONN; | |
415 | ||
416 | lock_sock(sk); | |
af426d32 | 417 | if (unlikely(sk->sk_state != TCP_ESTABLISHED)) |
1da177e4 LT |
418 | goto out; |
419 | rc = -EINVAL; | |
420 | if (how != 2) | |
421 | goto out; | |
422 | rc = llc_send_disc(sk); | |
423 | if (!rc) | |
424 | rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); | |
425 | /* Wake up anyone sleeping in poll */ | |
426 | sk->sk_state_change(sk); | |
427 | out: | |
428 | release_sock(sk); | |
429 | return rc; | |
430 | } | |
431 | ||
432 | /** | |
433 | * llc_ui_connect - Connect to a remote llc2 mac + sap. | |
434 | * @sock: Socket which will be connected to the remote destination. | |
435 | * @uaddr: Remote and possibly the local address of the new connection. | |
436 | * @addrlen: Size of uaddr structure. | |
437 | * @flags: Operational flags specified by the user. | |
438 | * | |
439 | * Connect to a remote llc2 mac + sap. The caller must specify the | |
440 | * destination mac and address to connect to. If the user hasn't previously | |
441 | * called bind(2) with a smac the address of the first interface of the | |
442 | * specified arp type will be used. | |
443 | * This function will autobind if user did not previously call bind. | |
444 | * Returns: 0 upon success, negative otherwise. | |
445 | */ | |
446 | static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr, | |
447 | int addrlen, int flags) | |
448 | { | |
449 | struct sock *sk = sock->sk; | |
450 | struct llc_sock *llc = llc_sk(sk); | |
451 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; | |
1da177e4 LT |
452 | int rc = -EINVAL; |
453 | ||
454 | lock_sock(sk); | |
af426d32 | 455 | if (unlikely(addrlen != sizeof(*addr))) |
1da177e4 LT |
456 | goto out; |
457 | rc = -EAFNOSUPPORT; | |
af426d32 ACM |
458 | if (unlikely(addr->sllc_family != AF_LLC)) |
459 | goto out; | |
460 | if (unlikely(sk->sk_type != SOCK_STREAM)) | |
461 | goto out; | |
462 | rc = -EALREADY; | |
463 | if (unlikely(sock->state == SS_CONNECTING)) | |
1da177e4 LT |
464 | goto out; |
465 | /* bind connection to sap if user hasn't done it. */ | |
466 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
467 | /* bind to sap with null dev, exclusive */ | |
468 | rc = llc_ui_autobind(sock, addr); | |
469 | if (rc) | |
470 | goto out; | |
1da177e4 | 471 | } |
5564af21 JF |
472 | llc->daddr.lsap = addr->sllc_sap; |
473 | memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
1da177e4 LT |
474 | sock->state = SS_CONNECTING; |
475 | sk->sk_state = TCP_SYN_SENT; | |
476 | llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap); | |
774ccb4f | 477 | rc = llc_establish_connection(sk, llc->dev->dev_addr, |
1da177e4 LT |
478 | addr->sllc_mac, addr->sllc_sap); |
479 | if (rc) { | |
0dc47877 | 480 | dprintk("%s: llc_ui_send_conn failed :-(\n", __func__); |
1da177e4 LT |
481 | sock->state = SS_UNCONNECTED; |
482 | sk->sk_state = TCP_CLOSE; | |
483 | goto out; | |
484 | } | |
b35bd110 ACM |
485 | |
486 | if (sk->sk_state == TCP_SYN_SENT) { | |
54fb7f25 | 487 | const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
b35bd110 ACM |
488 | |
489 | if (!timeo || !llc_ui_wait_for_conn(sk, timeo)) | |
490 | goto out; | |
491 | ||
492 | rc = sock_intr_errno(timeo); | |
493 | if (signal_pending(current)) | |
494 | goto out; | |
495 | } | |
496 | ||
497 | if (sk->sk_state == TCP_CLOSE) | |
498 | goto sock_error; | |
499 | ||
500 | sock->state = SS_CONNECTED; | |
501 | rc = 0; | |
1da177e4 LT |
502 | out: |
503 | release_sock(sk); | |
504 | return rc; | |
b35bd110 ACM |
505 | sock_error: |
506 | rc = sock_error(sk) ? : -ECONNABORTED; | |
507 | sock->state = SS_UNCONNECTED; | |
508 | goto out; | |
1da177e4 LT |
509 | } |
510 | ||
511 | /** | |
512 | * llc_ui_listen - allow a normal socket to accept incoming connections | |
513 | * @sock: Socket to allow incoming connections on. | |
514 | * @backlog: Number of connections to queue. | |
515 | * | |
516 | * Allow a normal socket to accept incoming connections. | |
517 | * Returns 0 upon success, negative otherwise. | |
518 | */ | |
519 | static int llc_ui_listen(struct socket *sock, int backlog) | |
520 | { | |
521 | struct sock *sk = sock->sk; | |
522 | int rc = -EINVAL; | |
523 | ||
524 | lock_sock(sk); | |
af426d32 | 525 | if (unlikely(sock->state != SS_UNCONNECTED)) |
1da177e4 LT |
526 | goto out; |
527 | rc = -EOPNOTSUPP; | |
af426d32 | 528 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
1da177e4 LT |
529 | goto out; |
530 | rc = -EAGAIN; | |
531 | if (sock_flag(sk, SOCK_ZAPPED)) | |
532 | goto out; | |
533 | rc = 0; | |
95c96174 | 534 | if (!(unsigned int)backlog) /* BSDism */ |
1da177e4 LT |
535 | backlog = 1; |
536 | sk->sk_max_ack_backlog = backlog; | |
537 | if (sk->sk_state != TCP_LISTEN) { | |
538 | sk->sk_ack_backlog = 0; | |
539 | sk->sk_state = TCP_LISTEN; | |
540 | } | |
541 | sk->sk_socket->flags |= __SO_ACCEPTCON; | |
542 | out: | |
543 | release_sock(sk); | |
544 | return rc; | |
545 | } | |
546 | ||
54fb7f25 | 547 | static int llc_ui_wait_for_disc(struct sock *sk, long timeout) |
1da177e4 | 548 | { |
d9dc8b0f | 549 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
b35bd110 | 550 | int rc = 0; |
1da177e4 | 551 | |
d9dc8b0f | 552 | add_wait_queue(sk_sleep(sk), &wait); |
54fb7f25 | 553 | while (1) { |
d9dc8b0f | 554 | if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE, &wait)) |
54fb7f25 | 555 | break; |
1da177e4 LT |
556 | rc = -ERESTARTSYS; |
557 | if (signal_pending(current)) | |
558 | break; | |
559 | rc = -EAGAIN; | |
560 | if (!timeout) | |
561 | break; | |
b35bd110 | 562 | rc = 0; |
1da177e4 | 563 | } |
d9dc8b0f | 564 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
565 | return rc; |
566 | } | |
567 | ||
5ff904d5 | 568 | static bool llc_ui_wait_for_conn(struct sock *sk, long timeout) |
1da177e4 | 569 | { |
d9dc8b0f | 570 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
1da177e4 | 571 | |
d9dc8b0f | 572 | add_wait_queue(sk_sleep(sk), &wait); |
54fb7f25 | 573 | while (1) { |
d9dc8b0f | 574 | if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT, &wait)) |
54fb7f25 | 575 | break; |
b35bd110 | 576 | if (signal_pending(current) || !timeout) |
1da177e4 LT |
577 | break; |
578 | } | |
d9dc8b0f | 579 | remove_wait_queue(sk_sleep(sk), &wait); |
b35bd110 | 580 | return timeout; |
1da177e4 LT |
581 | } |
582 | ||
afdbe357 | 583 | static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout) |
1da177e4 | 584 | { |
d9dc8b0f | 585 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
afdbe357 ACM |
586 | struct llc_sock *llc = llc_sk(sk); |
587 | int rc; | |
1da177e4 | 588 | |
d9dc8b0f | 589 | add_wait_queue(sk_sleep(sk), &wait); |
54fb7f25 | 590 | while (1) { |
afdbe357 | 591 | rc = 0; |
54fb7f25 ACM |
592 | if (sk_wait_event(sk, &timeout, |
593 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
afdbe357 | 594 | (!llc_data_accept_state(llc->state) && |
451677c4 | 595 | !llc->remote_busy_flag && |
d9dc8b0f | 596 | !llc->p_flag), &wait)) |
1da177e4 | 597 | break; |
1da177e4 LT |
598 | rc = -ERESTARTSYS; |
599 | if (signal_pending(current)) | |
600 | break; | |
601 | rc = -EAGAIN; | |
602 | if (!timeout) | |
603 | break; | |
604 | } | |
d9dc8b0f | 605 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
606 | return rc; |
607 | } | |
608 | ||
2928c19e | 609 | static int llc_wait_data(struct sock *sk, long timeo) |
1da177e4 | 610 | { |
1da177e4 LT |
611 | int rc; |
612 | ||
54fb7f25 | 613 | while (1) { |
afdbe357 ACM |
614 | /* |
615 | * POSIX 1003.1g mandates this order. | |
616 | */ | |
c1cbe4b7 BL |
617 | rc = sock_error(sk); |
618 | if (rc) | |
afdbe357 | 619 | break; |
1da177e4 | 620 | rc = 0; |
afdbe357 | 621 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
1da177e4 | 622 | break; |
afdbe357 ACM |
623 | rc = -EAGAIN; |
624 | if (!timeo) | |
625 | break; | |
626 | rc = sock_intr_errno(timeo); | |
1da177e4 LT |
627 | if (signal_pending(current)) |
628 | break; | |
afdbe357 | 629 | rc = 0; |
dfbafc99 | 630 | if (sk_wait_data(sk, &timeo, NULL)) |
1da177e4 LT |
631 | break; |
632 | } | |
1da177e4 LT |
633 | return rc; |
634 | } | |
635 | ||
e5cd6fe3 OP |
636 | static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb) |
637 | { | |
638 | struct llc_sock *llc = llc_sk(skb->sk); | |
639 | ||
640 | if (llc->cmsg_flags & LLC_CMSG_PKTINFO) { | |
641 | struct llc_pktinfo info; | |
642 | ||
b8670c09 | 643 | memset(&info, 0, sizeof(info)); |
e5cd6fe3 OP |
644 | info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex; |
645 | llc_pdu_decode_dsap(skb, &info.lpi_sap); | |
646 | llc_pdu_decode_da(skb, info.lpi_mac); | |
647 | put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info); | |
648 | } | |
649 | } | |
650 | ||
1da177e4 LT |
651 | /** |
652 | * llc_ui_accept - accept a new incoming connection. | |
653 | * @sock: Socket which connections arrive on. | |
654 | * @newsock: Socket to move incoming connection to. | |
655 | * @flags: User specified operational flags. | |
cdfbabfb | 656 | * @kern: If the socket is kernel internal |
1da177e4 LT |
657 | * |
658 | * Accept a new incoming connection. | |
659 | * Returns 0 upon success, negative otherwise. | |
660 | */ | |
cdfbabfb DH |
661 | static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags, |
662 | bool kern) | |
1da177e4 LT |
663 | { |
664 | struct sock *sk = sock->sk, *newsk; | |
665 | struct llc_sock *llc, *newllc; | |
666 | struct sk_buff *skb; | |
667 | int rc = -EOPNOTSUPP; | |
668 | ||
0dc47877 | 669 | dprintk("%s: accepting on %02X\n", __func__, |
d57b1869 | 670 | llc_sk(sk)->laddr.lsap); |
1da177e4 | 671 | lock_sock(sk); |
af426d32 | 672 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
1da177e4 LT |
673 | goto out; |
674 | rc = -EINVAL; | |
af426d32 ACM |
675 | if (unlikely(sock->state != SS_UNCONNECTED || |
676 | sk->sk_state != TCP_LISTEN)) | |
1da177e4 LT |
677 | goto out; |
678 | /* wait for a connection to arrive. */ | |
b35bd110 | 679 | if (skb_queue_empty(&sk->sk_receive_queue)) { |
afdbe357 | 680 | rc = llc_wait_data(sk, sk->sk_rcvtimeo); |
b35bd110 ACM |
681 | if (rc) |
682 | goto out; | |
683 | } | |
0dc47877 | 684 | dprintk("%s: got a new connection on %02X\n", __func__, |
d57b1869 | 685 | llc_sk(sk)->laddr.lsap); |
1da177e4 LT |
686 | skb = skb_dequeue(&sk->sk_receive_queue); |
687 | rc = -EINVAL; | |
688 | if (!skb->sk) | |
689 | goto frees; | |
690 | rc = 0; | |
691 | newsk = skb->sk; | |
692 | /* attach connection to a new socket. */ | |
693 | llc_ui_sk_init(newsock, newsk); | |
694 | sock_reset_flag(newsk, SOCK_ZAPPED); | |
695 | newsk->sk_state = TCP_ESTABLISHED; | |
696 | newsock->state = SS_CONNECTED; | |
697 | llc = llc_sk(sk); | |
698 | newllc = llc_sk(newsk); | |
699 | memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr)); | |
700 | newllc->link = llc_ui_next_link_no(newllc->laddr.lsap); | |
701 | ||
702 | /* put original socket back into a clean listen state. */ | |
703 | sk->sk_state = TCP_LISTEN; | |
704 | sk->sk_ack_backlog--; | |
0dc47877 | 705 | dprintk("%s: ok success on %02X, client on %02X\n", __func__, |
1da177e4 LT |
706 | llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap); |
707 | frees: | |
708 | kfree_skb(skb); | |
709 | out: | |
710 | release_sock(sk); | |
711 | return rc; | |
712 | } | |
713 | ||
714 | /** | |
715 | * llc_ui_recvmsg - copy received data to the socket user. | |
716 | * @sock: Socket to copy data from. | |
717 | * @msg: Various user space related information. | |
8420e1b5 | 718 | * @len: Size of user buffer. |
1da177e4 LT |
719 | * @flags: User specified flags. |
720 | * | |
721 | * Copy received data to the socket user. | |
722 | * Returns non-negative upon success, negative otherwise. | |
723 | */ | |
1b784140 YX |
724 | static int llc_ui_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, |
725 | int flags) | |
1da177e4 | 726 | { |
342dfc30 | 727 | DECLARE_SOCKADDR(struct sockaddr_llc *, uaddr, msg->msg_name); |
8420e1b5 ACM |
728 | const int nonblock = flags & MSG_DONTWAIT; |
729 | struct sk_buff *skb = NULL; | |
730 | struct sock *sk = sock->sk; | |
731 | struct llc_sock *llc = llc_sk(sk); | |
1da177e4 | 732 | size_t copied = 0; |
8420e1b5 | 733 | u32 peek_seq = 0; |
4d231b76 | 734 | u32 *seq, skb_len; |
8420e1b5 ACM |
735 | unsigned long used; |
736 | int target; /* Read at least this many bytes */ | |
737 | long timeo; | |
1da177e4 | 738 | |
1da177e4 | 739 | lock_sock(sk); |
8420e1b5 | 740 | copied = -ENOTCONN; |
29efcd26 | 741 | if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN)) |
1da177e4 | 742 | goto out; |
8420e1b5 ACM |
743 | |
744 | timeo = sock_rcvtimeo(sk, nonblock); | |
745 | ||
746 | seq = &llc->copied_seq; | |
747 | if (flags & MSG_PEEK) { | |
748 | peek_seq = llc->copied_seq; | |
749 | seq = &peek_seq; | |
d57b1869 | 750 | } |
8420e1b5 ACM |
751 | |
752 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
753 | copied = 0; | |
754 | ||
755 | do { | |
756 | u32 offset; | |
757 | ||
758 | /* | |
759 | * We need to check signals first, to get correct SIGURG | |
760 | * handling. FIXME: Need to check this doesn't impact 1003.1g | |
761 | * and move it down to the bottom of the loop | |
762 | */ | |
763 | if (signal_pending(current)) { | |
764 | if (copied) | |
765 | break; | |
766 | copied = timeo ? sock_intr_errno(timeo) : -EAGAIN; | |
767 | break; | |
768 | } | |
769 | ||
770 | /* Next get a buffer. */ | |
771 | ||
772 | skb = skb_peek(&sk->sk_receive_queue); | |
773 | if (skb) { | |
774 | offset = *seq; | |
775 | goto found_ok_skb; | |
776 | } | |
777 | /* Well, if we have backlog, try to process it now yet. */ | |
778 | ||
779 | if (copied >= target && !sk->sk_backlog.tail) | |
780 | break; | |
781 | ||
782 | if (copied) { | |
783 | if (sk->sk_err || | |
784 | sk->sk_state == TCP_CLOSE || | |
785 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
786 | !timeo || | |
787 | (flags & MSG_PEEK)) | |
788 | break; | |
789 | } else { | |
790 | if (sock_flag(sk, SOCK_DONE)) | |
791 | break; | |
792 | ||
793 | if (sk->sk_err) { | |
794 | copied = sock_error(sk); | |
795 | break; | |
796 | } | |
797 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
798 | break; | |
799 | ||
29efcd26 | 800 | if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) { |
8420e1b5 ACM |
801 | if (!sock_flag(sk, SOCK_DONE)) { |
802 | /* | |
803 | * This occurs when user tries to read | |
804 | * from never connected socket. | |
805 | */ | |
806 | copied = -ENOTCONN; | |
807 | break; | |
808 | } | |
809 | break; | |
810 | } | |
811 | if (!timeo) { | |
812 | copied = -EAGAIN; | |
813 | break; | |
814 | } | |
815 | } | |
816 | ||
817 | if (copied >= target) { /* Do not sleep, just process backlog. */ | |
818 | release_sock(sk); | |
819 | lock_sock(sk); | |
820 | } else | |
dfbafc99 | 821 | sk_wait_data(sk, &timeo, NULL); |
8420e1b5 ACM |
822 | |
823 | if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) { | |
e87cc472 JP |
824 | net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n", |
825 | current->comm, | |
826 | task_pid_nr(current)); | |
8420e1b5 ACM |
827 | peek_seq = llc->copied_seq; |
828 | } | |
829 | continue; | |
830 | found_ok_skb: | |
4d231b76 | 831 | skb_len = skb->len; |
8420e1b5 ACM |
832 | /* Ok so how much can we use? */ |
833 | used = skb->len - offset; | |
834 | if (len < used) | |
835 | used = len; | |
836 | ||
837 | if (!(flags & MSG_TRUNC)) { | |
51f3d02b | 838 | int rc = skb_copy_datagram_msg(skb, offset, msg, used); |
8420e1b5 ACM |
839 | if (rc) { |
840 | /* Exception. Bailout! */ | |
841 | if (!copied) | |
842 | copied = -EFAULT; | |
843 | break; | |
844 | } | |
845 | } | |
846 | ||
847 | *seq += used; | |
848 | copied += used; | |
849 | len -= used; | |
850 | ||
9cef310f AJ |
851 | /* For non stream protcols we get one packet per recvmsg call */ |
852 | if (sk->sk_type != SOCK_STREAM) | |
853 | goto copy_uaddr; | |
854 | ||
8420e1b5 | 855 | if (!(flags & MSG_PEEK)) { |
604d415e ED |
856 | skb_unlink(skb, &sk->sk_receive_queue); |
857 | kfree_skb(skb); | |
8420e1b5 ACM |
858 | *seq = 0; |
859 | } | |
30a584d9 | 860 | |
30a584d9 | 861 | /* Partial read */ |
4d231b76 | 862 | if (used + offset < skb_len) |
30a584d9 | 863 | continue; |
8420e1b5 ACM |
864 | } while (len > 0); |
865 | ||
1da177e4 LT |
866 | out: |
867 | release_sock(sk); | |
8420e1b5 ACM |
868 | return copied; |
869 | copy_uaddr: | |
870 | if (uaddr != NULL && skb != NULL) { | |
871 | memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr)); | |
872 | msg->msg_namelen = sizeof(*uaddr); | |
873 | } | |
e5cd6fe3 OP |
874 | if (llc_sk(sk)->cmsg_flags) |
875 | llc_cmsg_rcv(msg, skb); | |
9cef310f AJ |
876 | |
877 | if (!(flags & MSG_PEEK)) { | |
604d415e ED |
878 | skb_unlink(skb, &sk->sk_receive_queue); |
879 | kfree_skb(skb); | |
7bced397 | 880 | *seq = 0; |
9cef310f AJ |
881 | } |
882 | ||
8420e1b5 | 883 | goto out; |
1da177e4 LT |
884 | } |
885 | ||
886 | /** | |
887 | * llc_ui_sendmsg - Transmit data provided by the socket user. | |
888 | * @sock: Socket to transmit data from. | |
889 | * @msg: Various user related information. | |
890 | * @len: Length of data to transmit. | |
891 | * | |
892 | * Transmit data provided by the socket user. | |
893 | * Returns non-negative upon success, negative otherwise. | |
894 | */ | |
1b784140 | 895 | static int llc_ui_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
1da177e4 LT |
896 | { |
897 | struct sock *sk = sock->sk; | |
898 | struct llc_sock *llc = llc_sk(sk); | |
342dfc30 | 899 | DECLARE_SOCKADDR(struct sockaddr_llc *, addr, msg->msg_name); |
1da177e4 LT |
900 | int flags = msg->msg_flags; |
901 | int noblock = flags & MSG_DONTWAIT; | |
1da177e4 LT |
902 | struct sk_buff *skb; |
903 | size_t size = 0; | |
904 | int rc = -EINVAL, copied = 0, hdrlen; | |
905 | ||
0dc47877 | 906 | dprintk("%s: sending from %02X to %02X\n", __func__, |
1da177e4 LT |
907 | llc->laddr.lsap, llc->daddr.lsap); |
908 | lock_sock(sk); | |
909 | if (addr) { | |
910 | if (msg->msg_namelen < sizeof(*addr)) | |
911 | goto release; | |
912 | } else { | |
913 | if (llc_ui_addr_null(&llc->addr)) | |
914 | goto release; | |
915 | addr = &llc->addr; | |
916 | } | |
917 | /* must bind connection to sap if user hasn't done it. */ | |
918 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
919 | /* bind to sap with null dev, exclusive. */ | |
920 | rc = llc_ui_autobind(sock, addr); | |
921 | if (rc) | |
922 | goto release; | |
923 | } | |
774ccb4f | 924 | hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr); |
1da177e4 | 925 | size = hdrlen + len; |
774ccb4f ACM |
926 | if (size > llc->dev->mtu) |
927 | size = llc->dev->mtu; | |
1da177e4 | 928 | copied = size - hdrlen; |
2c5d5b13 ED |
929 | rc = -EINVAL; |
930 | if (copied < 0) | |
931 | goto release; | |
1da177e4 LT |
932 | release_sock(sk); |
933 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
934 | lock_sock(sk); | |
935 | if (!skb) | |
936 | goto release; | |
774ccb4f | 937 | skb->dev = llc->dev; |
1da177e4 | 938 | skb->protocol = llc_proto_type(addr->sllc_arphrd); |
d57b1869 | 939 | skb_reserve(skb, hdrlen); |
6ce8e9ce | 940 | rc = memcpy_from_msg(skb_put(skb, copied), msg, copied); |
1da177e4 LT |
941 | if (rc) |
942 | goto out; | |
943 | if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) { | |
944 | llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac, | |
945 | addr->sllc_sap); | |
946 | goto out; | |
947 | } | |
948 | if (addr->sllc_test) { | |
949 | llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac, | |
950 | addr->sllc_sap); | |
951 | goto out; | |
952 | } | |
953 | if (addr->sllc_xid) { | |
954 | llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac, | |
955 | addr->sllc_sap); | |
956 | goto out; | |
957 | } | |
958 | rc = -ENOPROTOOPT; | |
959 | if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua)) | |
960 | goto out; | |
961 | rc = llc_ui_send_data(sk, skb, noblock); | |
1da177e4 | 962 | out: |
249ff1c6 | 963 | if (rc) { |
1da177e4 LT |
964 | kfree_skb(skb); |
965 | release: | |
1da177e4 | 966 | dprintk("%s: failed sending from %02X to %02X: %d\n", |
0dc47877 | 967 | __func__, llc->laddr.lsap, llc->daddr.lsap, rc); |
249ff1c6 | 968 | } |
1da177e4 LT |
969 | release_sock(sk); |
970 | return rc ? : copied; | |
971 | } | |
972 | ||
973 | /** | |
974 | * llc_ui_getname - return the address info of a socket | |
975 | * @sock: Socket to get address of. | |
976 | * @uaddr: Address structure to return information. | |
977 | * @uaddrlen: Length of address structure. | |
978 | * @peer: Does user want local or remote address information. | |
979 | * | |
980 | * Return the address information of a socket. | |
981 | */ | |
982 | static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr, | |
9b2c45d4 | 983 | int peer) |
1da177e4 LT |
984 | { |
985 | struct sockaddr_llc sllc; | |
986 | struct sock *sk = sock->sk; | |
987 | struct llc_sock *llc = llc_sk(sk); | |
3592aaeb | 988 | int rc = -EBADF; |
1da177e4 | 989 | |
28e9fc59 | 990 | memset(&sllc, 0, sizeof(sllc)); |
1da177e4 LT |
991 | lock_sock(sk); |
992 | if (sock_flag(sk, SOCK_ZAPPED)) | |
993 | goto out; | |
1da177e4 LT |
994 | if (peer) { |
995 | rc = -ENOTCONN; | |
996 | if (sk->sk_state != TCP_ESTABLISHED) | |
997 | goto out; | |
998 | if(llc->dev) | |
999 | sllc.sllc_arphrd = llc->dev->type; | |
1000 | sllc.sllc_sap = llc->daddr.lsap; | |
1001 | memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN); | |
1002 | } else { | |
1003 | rc = -EINVAL; | |
1004 | if (!llc->sap) | |
1005 | goto out; | |
1006 | sllc.sllc_sap = llc->sap->laddr.lsap; | |
1007 | ||
1008 | if (llc->dev) { | |
1009 | sllc.sllc_arphrd = llc->dev->type; | |
a186d2ae | 1010 | memcpy(&sllc.sllc_mac, llc->dev->dev_addr, |
1da177e4 LT |
1011 | IFHWADDRLEN); |
1012 | } | |
1013 | } | |
1da177e4 LT |
1014 | sllc.sllc_family = AF_LLC; |
1015 | memcpy(uaddr, &sllc, sizeof(sllc)); | |
9b2c45d4 | 1016 | rc = sizeof(sllc); |
1da177e4 LT |
1017 | out: |
1018 | release_sock(sk); | |
1019 | return rc; | |
1020 | } | |
1021 | ||
1022 | /** | |
1023 | * llc_ui_ioctl - io controls for PF_LLC | |
1024 | * @sock: Socket to get/set info | |
1025 | * @cmd: command | |
1026 | * @arg: optional argument for cmd | |
1027 | * | |
1028 | * get/set info on llc sockets | |
1029 | */ | |
1030 | static int llc_ui_ioctl(struct socket *sock, unsigned int cmd, | |
1031 | unsigned long arg) | |
1032 | { | |
b5e5fa5e | 1033 | return -ENOIOCTLCMD; |
1da177e4 LT |
1034 | } |
1035 | ||
1036 | /** | |
1037 | * llc_ui_setsockopt - set various connection specific parameters. | |
1038 | * @sock: Socket to set options on. | |
1039 | * @level: Socket level user is requesting operations on. | |
1040 | * @optname: Operation name. | |
2c53040f | 1041 | * @optval: User provided operation data. |
1da177e4 LT |
1042 | * @optlen: Length of optval. |
1043 | * | |
1044 | * Set various connection specific parameters. | |
1045 | */ | |
1046 | static int llc_ui_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1047 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
1048 | { |
1049 | struct sock *sk = sock->sk; | |
1050 | struct llc_sock *llc = llc_sk(sk); | |
339db11b DC |
1051 | unsigned int opt; |
1052 | int rc = -EINVAL; | |
1da177e4 LT |
1053 | |
1054 | lock_sock(sk); | |
af426d32 | 1055 | if (unlikely(level != SOL_LLC || optlen != sizeof(int))) |
1da177e4 LT |
1056 | goto out; |
1057 | rc = get_user(opt, (int __user *)optval); | |
1058 | if (rc) | |
1059 | goto out; | |
1060 | rc = -EINVAL; | |
1061 | switch (optname) { | |
1062 | case LLC_OPT_RETRY: | |
1063 | if (opt > LLC_OPT_MAX_RETRY) | |
1064 | goto out; | |
1065 | llc->n2 = opt; | |
1066 | break; | |
1067 | case LLC_OPT_SIZE: | |
1068 | if (opt > LLC_OPT_MAX_SIZE) | |
1069 | goto out; | |
1070 | llc->n1 = opt; | |
1071 | break; | |
1072 | case LLC_OPT_ACK_TMR_EXP: | |
1073 | if (opt > LLC_OPT_MAX_ACK_TMR_EXP) | |
1074 | goto out; | |
590232a7 | 1075 | llc->ack_timer.expire = opt * HZ; |
1da177e4 LT |
1076 | break; |
1077 | case LLC_OPT_P_TMR_EXP: | |
1078 | if (opt > LLC_OPT_MAX_P_TMR_EXP) | |
1079 | goto out; | |
590232a7 | 1080 | llc->pf_cycle_timer.expire = opt * HZ; |
1da177e4 LT |
1081 | break; |
1082 | case LLC_OPT_REJ_TMR_EXP: | |
1083 | if (opt > LLC_OPT_MAX_REJ_TMR_EXP) | |
1084 | goto out; | |
590232a7 | 1085 | llc->rej_sent_timer.expire = opt * HZ; |
1da177e4 LT |
1086 | break; |
1087 | case LLC_OPT_BUSY_TMR_EXP: | |
1088 | if (opt > LLC_OPT_MAX_BUSY_TMR_EXP) | |
1089 | goto out; | |
590232a7 | 1090 | llc->busy_state_timer.expire = opt * HZ; |
1da177e4 LT |
1091 | break; |
1092 | case LLC_OPT_TX_WIN: | |
1093 | if (opt > LLC_OPT_MAX_WIN) | |
1094 | goto out; | |
1095 | llc->k = opt; | |
1096 | break; | |
1097 | case LLC_OPT_RX_WIN: | |
1098 | if (opt > LLC_OPT_MAX_WIN) | |
1099 | goto out; | |
1100 | llc->rw = opt; | |
1101 | break; | |
e5cd6fe3 OP |
1102 | case LLC_OPT_PKTINFO: |
1103 | if (opt) | |
1104 | llc->cmsg_flags |= LLC_CMSG_PKTINFO; | |
1105 | else | |
1106 | llc->cmsg_flags &= ~LLC_CMSG_PKTINFO; | |
1107 | break; | |
1da177e4 LT |
1108 | default: |
1109 | rc = -ENOPROTOOPT; | |
1110 | goto out; | |
1111 | } | |
1112 | rc = 0; | |
1113 | out: | |
1114 | release_sock(sk); | |
1115 | return rc; | |
1116 | } | |
1117 | ||
1118 | /** | |
1119 | * llc_ui_getsockopt - get connection specific socket info | |
1120 | * @sock: Socket to get information from. | |
1121 | * @level: Socket level user is requesting operations on. | |
1122 | * @optname: Operation name. | |
1123 | * @optval: Variable to return operation data in. | |
1124 | * @optlen: Length of optval. | |
1125 | * | |
1126 | * Get connection specific socket information. | |
1127 | */ | |
1128 | static int llc_ui_getsockopt(struct socket *sock, int level, int optname, | |
1129 | char __user *optval, int __user *optlen) | |
1130 | { | |
1131 | struct sock *sk = sock->sk; | |
1132 | struct llc_sock *llc = llc_sk(sk); | |
1133 | int val = 0, len = 0, rc = -EINVAL; | |
1134 | ||
1135 | lock_sock(sk); | |
af426d32 | 1136 | if (unlikely(level != SOL_LLC)) |
1da177e4 LT |
1137 | goto out; |
1138 | rc = get_user(len, optlen); | |
1139 | if (rc) | |
1140 | goto out; | |
1141 | rc = -EINVAL; | |
1142 | if (len != sizeof(int)) | |
1143 | goto out; | |
1144 | switch (optname) { | |
1145 | case LLC_OPT_RETRY: | |
590232a7 | 1146 | val = llc->n2; break; |
1da177e4 | 1147 | case LLC_OPT_SIZE: |
590232a7 | 1148 | val = llc->n1; break; |
1da177e4 | 1149 | case LLC_OPT_ACK_TMR_EXP: |
590232a7 | 1150 | val = llc->ack_timer.expire / HZ; break; |
1da177e4 | 1151 | case LLC_OPT_P_TMR_EXP: |
590232a7 | 1152 | val = llc->pf_cycle_timer.expire / HZ; break; |
1da177e4 | 1153 | case LLC_OPT_REJ_TMR_EXP: |
590232a7 | 1154 | val = llc->rej_sent_timer.expire / HZ; break; |
1da177e4 | 1155 | case LLC_OPT_BUSY_TMR_EXP: |
590232a7 | 1156 | val = llc->busy_state_timer.expire / HZ; break; |
1da177e4 LT |
1157 | case LLC_OPT_TX_WIN: |
1158 | val = llc->k; break; | |
1159 | case LLC_OPT_RX_WIN: | |
1160 | val = llc->rw; break; | |
e5cd6fe3 OP |
1161 | case LLC_OPT_PKTINFO: |
1162 | val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0; | |
1163 | break; | |
1da177e4 LT |
1164 | default: |
1165 | rc = -ENOPROTOOPT; | |
1166 | goto out; | |
1167 | } | |
1168 | rc = 0; | |
1169 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) | |
1170 | rc = -EFAULT; | |
1171 | out: | |
1172 | release_sock(sk); | |
1173 | return rc; | |
1174 | } | |
1175 | ||
ec1b4cf7 | 1176 | static const struct net_proto_family llc_ui_family_ops = { |
1da177e4 LT |
1177 | .family = PF_LLC, |
1178 | .create = llc_ui_create, | |
1179 | .owner = THIS_MODULE, | |
1180 | }; | |
1181 | ||
90ddc4f0 | 1182 | static const struct proto_ops llc_ui_ops = { |
1da177e4 LT |
1183 | .family = PF_LLC, |
1184 | .owner = THIS_MODULE, | |
1185 | .release = llc_ui_release, | |
1186 | .bind = llc_ui_bind, | |
1187 | .connect = llc_ui_connect, | |
1188 | .socketpair = sock_no_socketpair, | |
1189 | .accept = llc_ui_accept, | |
1190 | .getname = llc_ui_getname, | |
a11e1d43 | 1191 | .poll = datagram_poll, |
1da177e4 LT |
1192 | .ioctl = llc_ui_ioctl, |
1193 | .listen = llc_ui_listen, | |
1194 | .shutdown = llc_ui_shutdown, | |
1195 | .setsockopt = llc_ui_setsockopt, | |
1196 | .getsockopt = llc_ui_getsockopt, | |
1197 | .sendmsg = llc_ui_sendmsg, | |
1198 | .recvmsg = llc_ui_recvmsg, | |
1199 | .mmap = sock_no_mmap, | |
1200 | .sendpage = sock_no_sendpage, | |
1201 | }; | |
1202 | ||
01af4a0e | 1203 | static const char llc_proc_err_msg[] __initconst = |
d57b1869 | 1204 | KERN_CRIT "LLC: Unable to register the proc_fs entries\n"; |
01af4a0e | 1205 | static const char llc_sysctl_err_msg[] __initconst = |
d57b1869 | 1206 | KERN_CRIT "LLC: Unable to register the sysctl entries\n"; |
01af4a0e | 1207 | static const char llc_sock_err_msg[] __initconst = |
d57b1869 | 1208 | KERN_CRIT "LLC: Unable to register the network family\n"; |
590232a7 | 1209 | |
1da177e4 LT |
1210 | static int __init llc2_init(void) |
1211 | { | |
1212 | int rc = proto_register(&llc_proto, 0); | |
1213 | ||
1214 | if (rc != 0) | |
1215 | goto out; | |
1216 | ||
1217 | llc_build_offset_table(); | |
1218 | llc_station_init(); | |
1219 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; | |
1220 | rc = llc_proc_init(); | |
590232a7 ACM |
1221 | if (rc != 0) { |
1222 | printk(llc_proc_err_msg); | |
f4f8720f | 1223 | goto out_station; |
590232a7 ACM |
1224 | } |
1225 | rc = llc_sysctl_init(); | |
1226 | if (rc) { | |
1227 | printk(llc_sysctl_err_msg); | |
1228 | goto out_proc; | |
1229 | } | |
1230 | rc = sock_register(&llc_ui_family_ops); | |
1231 | if (rc) { | |
1232 | printk(llc_sock_err_msg); | |
1233 | goto out_sysctl; | |
1234 | } | |
1da177e4 LT |
1235 | llc_add_pack(LLC_DEST_SAP, llc_sap_handler); |
1236 | llc_add_pack(LLC_DEST_CONN, llc_conn_handler); | |
1237 | out: | |
1238 | return rc; | |
590232a7 ACM |
1239 | out_sysctl: |
1240 | llc_sysctl_exit(); | |
1241 | out_proc: | |
1242 | llc_proc_exit(); | |
f4f8720f BH |
1243 | out_station: |
1244 | llc_station_exit(); | |
1da177e4 LT |
1245 | proto_unregister(&llc_proto); |
1246 | goto out; | |
1247 | } | |
1248 | ||
1249 | static void __exit llc2_exit(void) | |
1250 | { | |
1251 | llc_station_exit(); | |
1252 | llc_remove_pack(LLC_DEST_SAP); | |
1253 | llc_remove_pack(LLC_DEST_CONN); | |
1254 | sock_unregister(PF_LLC); | |
1255 | llc_proc_exit(); | |
590232a7 | 1256 | llc_sysctl_exit(); |
1da177e4 LT |
1257 | proto_unregister(&llc_proto); |
1258 | } | |
1259 | ||
1260 | module_init(llc2_init); | |
1261 | module_exit(llc2_exit); | |
1262 | ||
1263 | MODULE_LICENSE("GPL"); | |
1264 | MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003"); | |
1265 | MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support"); | |
1266 | MODULE_ALIAS_NETPROTO(PF_LLC); |