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> |
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); | |
3100aa9d | 202 | if (!sock_flag(sk, SOCK_ZAPPED)) |
1da177e4 LT |
203 | llc_sap_remove_socket(llc->sap, sk); |
204 | release_sock(sk); | |
1da177e4 LT |
205 | if (llc->dev) |
206 | dev_put(llc->dev); | |
207 | sock_put(sk); | |
208 | llc_sk_free(sk); | |
209 | out: | |
210 | return 0; | |
211 | } | |
212 | ||
213 | /** | |
214 | * llc_ui_autoport - provide dynamically allocate SAP number | |
215 | * | |
216 | * Provide the caller with a dynamically allocated SAP number according | |
217 | * to the rules that are set in this function. Returns: 0, upon failure, | |
218 | * SAP number otherwise. | |
219 | */ | |
220 | static int llc_ui_autoport(void) | |
221 | { | |
222 | struct llc_sap *sap; | |
223 | int i, tries = 0; | |
224 | ||
225 | while (tries < LLC_SAP_DYN_TRIES) { | |
226 | for (i = llc_ui_sap_last_autoport; | |
227 | i < LLC_SAP_DYN_STOP; i += 2) { | |
228 | sap = llc_sap_find(i); | |
229 | if (!sap) { | |
230 | llc_ui_sap_last_autoport = i + 2; | |
231 | goto out; | |
232 | } | |
6e2144b7 | 233 | llc_sap_put(sap); |
1da177e4 LT |
234 | } |
235 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; | |
236 | tries++; | |
237 | } | |
238 | i = 0; | |
239 | out: | |
240 | return i; | |
241 | } | |
242 | ||
243 | /** | |
5a770c02 ACM |
244 | * llc_ui_autobind - automatically bind a socket to a sap |
245 | * @sock: socket to bind | |
246 | * @addr: address to connect to | |
247 | * | |
248 | * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't | |
249 | * specifically used llc_ui_bind to bind to an specific address/sap | |
1da177e4 | 250 | * |
1da177e4 LT |
251 | * Returns: 0 upon success, negative otherwise. |
252 | */ | |
253 | static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr) | |
254 | { | |
255 | struct sock *sk = sock->sk; | |
256 | struct llc_sock *llc = llc_sk(sk); | |
257 | struct llc_sap *sap; | |
258 | int rc = -EINVAL; | |
259 | ||
260 | if (!sock_flag(sk, SOCK_ZAPPED)) | |
261 | goto out; | |
262 | rc = -ENODEV; | |
abf9d537 OP |
263 | if (sk->sk_bound_dev_if) { |
264 | llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if); | |
265 | if (llc->dev && addr->sllc_arphrd != llc->dev->type) { | |
266 | dev_put(llc->dev); | |
267 | llc->dev = NULL; | |
268 | } | |
269 | } else | |
270 | llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd); | |
1da177e4 LT |
271 | if (!llc->dev) |
272 | goto out; | |
273 | rc = -EUSERS; | |
274 | llc->laddr.lsap = llc_ui_autoport(); | |
275 | if (!llc->laddr.lsap) | |
276 | goto out; | |
277 | rc = -EBUSY; /* some other network layer is using the sap */ | |
278 | sap = llc_sap_open(llc->laddr.lsap, NULL); | |
279 | if (!sap) | |
280 | goto out; | |
281 | memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN); | |
282 | memcpy(&llc->addr, addr, sizeof(llc->addr)); | |
283 | /* assign new connection to its SAP */ | |
284 | llc_sap_add_socket(sap, sk); | |
285 | sock_reset_flag(sk, SOCK_ZAPPED); | |
286 | rc = 0; | |
287 | out: | |
288 | return rc; | |
289 | } | |
290 | ||
291 | /** | |
292 | * llc_ui_bind - bind a socket to a specific address. | |
293 | * @sock: Socket to bind an address to. | |
294 | * @uaddr: Address the user wants the socket bound to. | |
295 | * @addrlen: Length of the uaddr structure. | |
296 | * | |
297 | * Bind a socket to a specific address. For llc a user is able to bind to | |
5a770c02 | 298 | * a specific sap only or mac + sap. |
1da177e4 LT |
299 | * If the user desires to bind to a specific mac + sap, it is possible to |
300 | * have multiple sap connections via multiple macs. | |
301 | * Bind and autobind for that matter must enforce the correct sap usage | |
302 | * otherwise all hell will break loose. | |
303 | * Returns: 0 upon success, negative otherwise. | |
304 | */ | |
305 | static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen) | |
306 | { | |
307 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; | |
308 | struct sock *sk = sock->sk; | |
309 | struct llc_sock *llc = llc_sk(sk); | |
310 | struct llc_sap *sap; | |
311 | int rc = -EINVAL; | |
312 | ||
0dc47877 | 313 | dprintk("%s: binding %02X\n", __func__, addr->sllc_sap); |
0908cf4d | 314 | |
315 | lock_sock(sk); | |
af426d32 | 316 | if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr))) |
1da177e4 LT |
317 | goto out; |
318 | rc = -EAFNOSUPPORT; | |
af426d32 | 319 | if (unlikely(addr->sllc_family != AF_LLC)) |
1da177e4 | 320 | goto out; |
cf309e3f | 321 | rc = -ENODEV; |
941666c2 | 322 | rcu_read_lock(); |
abf9d537 | 323 | if (sk->sk_bound_dev_if) { |
941666c2 | 324 | llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if); |
abf9d537 OP |
325 | if (llc->dev) { |
326 | if (!addr->sllc_arphrd) | |
327 | addr->sllc_arphrd = llc->dev->type; | |
951fd874 | 328 | if (is_zero_ether_addr(addr->sllc_mac)) |
abf9d537 OP |
329 | memcpy(addr->sllc_mac, llc->dev->dev_addr, |
330 | IFHWADDRLEN); | |
331 | if (addr->sllc_arphrd != llc->dev->type || | |
951fd874 JP |
332 | !ether_addr_equal(addr->sllc_mac, |
333 | llc->dev->dev_addr)) { | |
abf9d537 | 334 | rc = -EINVAL; |
abf9d537 OP |
335 | llc->dev = NULL; |
336 | } | |
337 | } | |
338 | } else | |
941666c2 | 339 | llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd, |
abf9d537 | 340 | addr->sllc_mac); |
941666c2 ED |
341 | if (llc->dev) |
342 | dev_hold(llc->dev); | |
343 | rcu_read_unlock(); | |
cf309e3f JF |
344 | if (!llc->dev) |
345 | goto out; | |
1da177e4 LT |
346 | if (!addr->sllc_sap) { |
347 | rc = -EUSERS; | |
348 | addr->sllc_sap = llc_ui_autoport(); | |
349 | if (!addr->sllc_sap) | |
350 | goto out; | |
351 | } | |
352 | sap = llc_sap_find(addr->sllc_sap); | |
353 | if (!sap) { | |
354 | sap = llc_sap_open(addr->sllc_sap, NULL); | |
355 | rc = -EBUSY; /* some other network layer is using the sap */ | |
356 | if (!sap) | |
357 | goto out; | |
358 | } else { | |
359 | struct llc_addr laddr, daddr; | |
360 | struct sock *ask; | |
361 | ||
362 | memset(&laddr, 0, sizeof(laddr)); | |
363 | memset(&daddr, 0, sizeof(daddr)); | |
364 | /* | |
59c51591 | 365 | * FIXME: check if the address is multicast, |
1da177e4 LT |
366 | * only SOCK_DGRAM can do this. |
367 | */ | |
368 | memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
369 | laddr.lsap = addr->sllc_sap; | |
370 | rc = -EADDRINUSE; /* mac + sap clash. */ | |
371 | ask = llc_lookup_established(sap, &daddr, &laddr); | |
372 | if (ask) { | |
373 | sock_put(ask); | |
6e2144b7 | 374 | goto out_put; |
1da177e4 LT |
375 | } |
376 | } | |
377 | llc->laddr.lsap = addr->sllc_sap; | |
378 | memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
379 | memcpy(&llc->addr, addr, sizeof(llc->addr)); | |
380 | /* assign new connection to its SAP */ | |
381 | llc_sap_add_socket(sap, sk); | |
382 | sock_reset_flag(sk, SOCK_ZAPPED); | |
383 | rc = 0; | |
6e2144b7 ACM |
384 | out_put: |
385 | llc_sap_put(sap); | |
1da177e4 | 386 | out: |
0908cf4d | 387 | release_sock(sk); |
1da177e4 LT |
388 | return rc; |
389 | } | |
390 | ||
391 | /** | |
392 | * llc_ui_shutdown - shutdown a connect llc2 socket. | |
393 | * @sock: Socket to shutdown. | |
394 | * @how: What part of the socket to shutdown. | |
395 | * | |
396 | * Shutdown a connected llc2 socket. Currently this function only supports | |
397 | * shutting down both sends and receives (2), we could probably make this | |
398 | * function such that a user can shutdown only half the connection but not | |
399 | * right now. | |
400 | * Returns: 0 upon success, negative otherwise. | |
401 | */ | |
402 | static int llc_ui_shutdown(struct socket *sock, int how) | |
403 | { | |
404 | struct sock *sk = sock->sk; | |
405 | int rc = -ENOTCONN; | |
406 | ||
407 | lock_sock(sk); | |
af426d32 | 408 | if (unlikely(sk->sk_state != TCP_ESTABLISHED)) |
1da177e4 LT |
409 | goto out; |
410 | rc = -EINVAL; | |
411 | if (how != 2) | |
412 | goto out; | |
413 | rc = llc_send_disc(sk); | |
414 | if (!rc) | |
415 | rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); | |
416 | /* Wake up anyone sleeping in poll */ | |
417 | sk->sk_state_change(sk); | |
418 | out: | |
419 | release_sock(sk); | |
420 | return rc; | |
421 | } | |
422 | ||
423 | /** | |
424 | * llc_ui_connect - Connect to a remote llc2 mac + sap. | |
425 | * @sock: Socket which will be connected to the remote destination. | |
426 | * @uaddr: Remote and possibly the local address of the new connection. | |
427 | * @addrlen: Size of uaddr structure. | |
428 | * @flags: Operational flags specified by the user. | |
429 | * | |
430 | * Connect to a remote llc2 mac + sap. The caller must specify the | |
431 | * destination mac and address to connect to. If the user hasn't previously | |
432 | * called bind(2) with a smac the address of the first interface of the | |
433 | * specified arp type will be used. | |
434 | * This function will autobind if user did not previously call bind. | |
435 | * Returns: 0 upon success, negative otherwise. | |
436 | */ | |
437 | static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr, | |
438 | int addrlen, int flags) | |
439 | { | |
440 | struct sock *sk = sock->sk; | |
441 | struct llc_sock *llc = llc_sk(sk); | |
442 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; | |
1da177e4 LT |
443 | int rc = -EINVAL; |
444 | ||
445 | lock_sock(sk); | |
af426d32 | 446 | if (unlikely(addrlen != sizeof(*addr))) |
1da177e4 LT |
447 | goto out; |
448 | rc = -EAFNOSUPPORT; | |
af426d32 ACM |
449 | if (unlikely(addr->sllc_family != AF_LLC)) |
450 | goto out; | |
451 | if (unlikely(sk->sk_type != SOCK_STREAM)) | |
452 | goto out; | |
453 | rc = -EALREADY; | |
454 | if (unlikely(sock->state == SS_CONNECTING)) | |
1da177e4 LT |
455 | goto out; |
456 | /* bind connection to sap if user hasn't done it. */ | |
457 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
458 | /* bind to sap with null dev, exclusive */ | |
459 | rc = llc_ui_autobind(sock, addr); | |
460 | if (rc) | |
461 | goto out; | |
1da177e4 | 462 | } |
5564af21 JF |
463 | llc->daddr.lsap = addr->sllc_sap; |
464 | memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
1da177e4 LT |
465 | sock->state = SS_CONNECTING; |
466 | sk->sk_state = TCP_SYN_SENT; | |
467 | llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap); | |
774ccb4f | 468 | rc = llc_establish_connection(sk, llc->dev->dev_addr, |
1da177e4 LT |
469 | addr->sllc_mac, addr->sllc_sap); |
470 | if (rc) { | |
0dc47877 | 471 | dprintk("%s: llc_ui_send_conn failed :-(\n", __func__); |
1da177e4 LT |
472 | sock->state = SS_UNCONNECTED; |
473 | sk->sk_state = TCP_CLOSE; | |
474 | goto out; | |
475 | } | |
b35bd110 ACM |
476 | |
477 | if (sk->sk_state == TCP_SYN_SENT) { | |
54fb7f25 | 478 | const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
b35bd110 ACM |
479 | |
480 | if (!timeo || !llc_ui_wait_for_conn(sk, timeo)) | |
481 | goto out; | |
482 | ||
483 | rc = sock_intr_errno(timeo); | |
484 | if (signal_pending(current)) | |
485 | goto out; | |
486 | } | |
487 | ||
488 | if (sk->sk_state == TCP_CLOSE) | |
489 | goto sock_error; | |
490 | ||
491 | sock->state = SS_CONNECTED; | |
492 | rc = 0; | |
1da177e4 LT |
493 | out: |
494 | release_sock(sk); | |
495 | return rc; | |
b35bd110 ACM |
496 | sock_error: |
497 | rc = sock_error(sk) ? : -ECONNABORTED; | |
498 | sock->state = SS_UNCONNECTED; | |
499 | goto out; | |
1da177e4 LT |
500 | } |
501 | ||
502 | /** | |
503 | * llc_ui_listen - allow a normal socket to accept incoming connections | |
504 | * @sock: Socket to allow incoming connections on. | |
505 | * @backlog: Number of connections to queue. | |
506 | * | |
507 | * Allow a normal socket to accept incoming connections. | |
508 | * Returns 0 upon success, negative otherwise. | |
509 | */ | |
510 | static int llc_ui_listen(struct socket *sock, int backlog) | |
511 | { | |
512 | struct sock *sk = sock->sk; | |
513 | int rc = -EINVAL; | |
514 | ||
515 | lock_sock(sk); | |
af426d32 | 516 | if (unlikely(sock->state != SS_UNCONNECTED)) |
1da177e4 LT |
517 | goto out; |
518 | rc = -EOPNOTSUPP; | |
af426d32 | 519 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
1da177e4 LT |
520 | goto out; |
521 | rc = -EAGAIN; | |
522 | if (sock_flag(sk, SOCK_ZAPPED)) | |
523 | goto out; | |
524 | rc = 0; | |
95c96174 | 525 | if (!(unsigned int)backlog) /* BSDism */ |
1da177e4 LT |
526 | backlog = 1; |
527 | sk->sk_max_ack_backlog = backlog; | |
528 | if (sk->sk_state != TCP_LISTEN) { | |
529 | sk->sk_ack_backlog = 0; | |
530 | sk->sk_state = TCP_LISTEN; | |
531 | } | |
532 | sk->sk_socket->flags |= __SO_ACCEPTCON; | |
533 | out: | |
534 | release_sock(sk); | |
535 | return rc; | |
536 | } | |
537 | ||
54fb7f25 | 538 | static int llc_ui_wait_for_disc(struct sock *sk, long timeout) |
1da177e4 | 539 | { |
d9dc8b0f | 540 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
b35bd110 | 541 | int rc = 0; |
1da177e4 | 542 | |
d9dc8b0f | 543 | add_wait_queue(sk_sleep(sk), &wait); |
54fb7f25 | 544 | while (1) { |
d9dc8b0f | 545 | if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE, &wait)) |
54fb7f25 | 546 | break; |
1da177e4 LT |
547 | rc = -ERESTARTSYS; |
548 | if (signal_pending(current)) | |
549 | break; | |
550 | rc = -EAGAIN; | |
551 | if (!timeout) | |
552 | break; | |
b35bd110 | 553 | rc = 0; |
1da177e4 | 554 | } |
d9dc8b0f | 555 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
556 | return rc; |
557 | } | |
558 | ||
5ff904d5 | 559 | static bool llc_ui_wait_for_conn(struct sock *sk, long timeout) |
1da177e4 | 560 | { |
d9dc8b0f | 561 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
1da177e4 | 562 | |
d9dc8b0f | 563 | add_wait_queue(sk_sleep(sk), &wait); |
54fb7f25 | 564 | while (1) { |
d9dc8b0f | 565 | if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT, &wait)) |
54fb7f25 | 566 | break; |
b35bd110 | 567 | if (signal_pending(current) || !timeout) |
1da177e4 LT |
568 | break; |
569 | } | |
d9dc8b0f | 570 | remove_wait_queue(sk_sleep(sk), &wait); |
b35bd110 | 571 | return timeout; |
1da177e4 LT |
572 | } |
573 | ||
afdbe357 | 574 | static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout) |
1da177e4 | 575 | { |
d9dc8b0f | 576 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
afdbe357 ACM |
577 | struct llc_sock *llc = llc_sk(sk); |
578 | int rc; | |
1da177e4 | 579 | |
d9dc8b0f | 580 | add_wait_queue(sk_sleep(sk), &wait); |
54fb7f25 | 581 | while (1) { |
afdbe357 | 582 | rc = 0; |
54fb7f25 ACM |
583 | if (sk_wait_event(sk, &timeout, |
584 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
afdbe357 | 585 | (!llc_data_accept_state(llc->state) && |
451677c4 | 586 | !llc->remote_busy_flag && |
d9dc8b0f | 587 | !llc->p_flag), &wait)) |
1da177e4 | 588 | break; |
1da177e4 LT |
589 | rc = -ERESTARTSYS; |
590 | if (signal_pending(current)) | |
591 | break; | |
592 | rc = -EAGAIN; | |
593 | if (!timeout) | |
594 | break; | |
595 | } | |
d9dc8b0f | 596 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
597 | return rc; |
598 | } | |
599 | ||
2928c19e | 600 | static int llc_wait_data(struct sock *sk, long timeo) |
1da177e4 | 601 | { |
1da177e4 LT |
602 | int rc; |
603 | ||
54fb7f25 | 604 | while (1) { |
afdbe357 ACM |
605 | /* |
606 | * POSIX 1003.1g mandates this order. | |
607 | */ | |
c1cbe4b7 BL |
608 | rc = sock_error(sk); |
609 | if (rc) | |
afdbe357 | 610 | break; |
1da177e4 | 611 | rc = 0; |
afdbe357 | 612 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
1da177e4 | 613 | break; |
afdbe357 ACM |
614 | rc = -EAGAIN; |
615 | if (!timeo) | |
616 | break; | |
617 | rc = sock_intr_errno(timeo); | |
1da177e4 LT |
618 | if (signal_pending(current)) |
619 | break; | |
afdbe357 | 620 | rc = 0; |
dfbafc99 | 621 | if (sk_wait_data(sk, &timeo, NULL)) |
1da177e4 LT |
622 | break; |
623 | } | |
1da177e4 LT |
624 | return rc; |
625 | } | |
626 | ||
e5cd6fe3 OP |
627 | static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb) |
628 | { | |
629 | struct llc_sock *llc = llc_sk(skb->sk); | |
630 | ||
631 | if (llc->cmsg_flags & LLC_CMSG_PKTINFO) { | |
632 | struct llc_pktinfo info; | |
633 | ||
b8670c09 | 634 | memset(&info, 0, sizeof(info)); |
e5cd6fe3 OP |
635 | info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex; |
636 | llc_pdu_decode_dsap(skb, &info.lpi_sap); | |
637 | llc_pdu_decode_da(skb, info.lpi_mac); | |
638 | put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info); | |
639 | } | |
640 | } | |
641 | ||
1da177e4 LT |
642 | /** |
643 | * llc_ui_accept - accept a new incoming connection. | |
644 | * @sock: Socket which connections arrive on. | |
645 | * @newsock: Socket to move incoming connection to. | |
646 | * @flags: User specified operational flags. | |
cdfbabfb | 647 | * @kern: If the socket is kernel internal |
1da177e4 LT |
648 | * |
649 | * Accept a new incoming connection. | |
650 | * Returns 0 upon success, negative otherwise. | |
651 | */ | |
cdfbabfb DH |
652 | static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags, |
653 | bool kern) | |
1da177e4 LT |
654 | { |
655 | struct sock *sk = sock->sk, *newsk; | |
656 | struct llc_sock *llc, *newllc; | |
657 | struct sk_buff *skb; | |
658 | int rc = -EOPNOTSUPP; | |
659 | ||
0dc47877 | 660 | dprintk("%s: accepting on %02X\n", __func__, |
d57b1869 | 661 | llc_sk(sk)->laddr.lsap); |
1da177e4 | 662 | lock_sock(sk); |
af426d32 | 663 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
1da177e4 LT |
664 | goto out; |
665 | rc = -EINVAL; | |
af426d32 ACM |
666 | if (unlikely(sock->state != SS_UNCONNECTED || |
667 | sk->sk_state != TCP_LISTEN)) | |
1da177e4 LT |
668 | goto out; |
669 | /* wait for a connection to arrive. */ | |
b35bd110 | 670 | if (skb_queue_empty(&sk->sk_receive_queue)) { |
afdbe357 | 671 | rc = llc_wait_data(sk, sk->sk_rcvtimeo); |
b35bd110 ACM |
672 | if (rc) |
673 | goto out; | |
674 | } | |
0dc47877 | 675 | dprintk("%s: got a new connection on %02X\n", __func__, |
d57b1869 | 676 | llc_sk(sk)->laddr.lsap); |
1da177e4 LT |
677 | skb = skb_dequeue(&sk->sk_receive_queue); |
678 | rc = -EINVAL; | |
679 | if (!skb->sk) | |
680 | goto frees; | |
681 | rc = 0; | |
682 | newsk = skb->sk; | |
683 | /* attach connection to a new socket. */ | |
684 | llc_ui_sk_init(newsock, newsk); | |
685 | sock_reset_flag(newsk, SOCK_ZAPPED); | |
686 | newsk->sk_state = TCP_ESTABLISHED; | |
687 | newsock->state = SS_CONNECTED; | |
688 | llc = llc_sk(sk); | |
689 | newllc = llc_sk(newsk); | |
690 | memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr)); | |
691 | newllc->link = llc_ui_next_link_no(newllc->laddr.lsap); | |
692 | ||
693 | /* put original socket back into a clean listen state. */ | |
694 | sk->sk_state = TCP_LISTEN; | |
695 | sk->sk_ack_backlog--; | |
0dc47877 | 696 | dprintk("%s: ok success on %02X, client on %02X\n", __func__, |
1da177e4 LT |
697 | llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap); |
698 | frees: | |
699 | kfree_skb(skb); | |
700 | out: | |
701 | release_sock(sk); | |
702 | return rc; | |
703 | } | |
704 | ||
705 | /** | |
706 | * llc_ui_recvmsg - copy received data to the socket user. | |
707 | * @sock: Socket to copy data from. | |
708 | * @msg: Various user space related information. | |
8420e1b5 | 709 | * @len: Size of user buffer. |
1da177e4 LT |
710 | * @flags: User specified flags. |
711 | * | |
712 | * Copy received data to the socket user. | |
713 | * Returns non-negative upon success, negative otherwise. | |
714 | */ | |
1b784140 YX |
715 | static int llc_ui_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, |
716 | int flags) | |
1da177e4 | 717 | { |
342dfc30 | 718 | DECLARE_SOCKADDR(struct sockaddr_llc *, uaddr, msg->msg_name); |
8420e1b5 ACM |
719 | const int nonblock = flags & MSG_DONTWAIT; |
720 | struct sk_buff *skb = NULL; | |
721 | struct sock *sk = sock->sk; | |
722 | struct llc_sock *llc = llc_sk(sk); | |
56ac11cf | 723 | unsigned long cpu_flags; |
1da177e4 | 724 | size_t copied = 0; |
8420e1b5 | 725 | u32 peek_seq = 0; |
4d231b76 | 726 | u32 *seq, skb_len; |
8420e1b5 ACM |
727 | unsigned long used; |
728 | int target; /* Read at least this many bytes */ | |
729 | long timeo; | |
1da177e4 | 730 | |
1da177e4 | 731 | lock_sock(sk); |
8420e1b5 | 732 | copied = -ENOTCONN; |
29efcd26 | 733 | if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN)) |
1da177e4 | 734 | goto out; |
8420e1b5 ACM |
735 | |
736 | timeo = sock_rcvtimeo(sk, nonblock); | |
737 | ||
738 | seq = &llc->copied_seq; | |
739 | if (flags & MSG_PEEK) { | |
740 | peek_seq = llc->copied_seq; | |
741 | seq = &peek_seq; | |
d57b1869 | 742 | } |
8420e1b5 ACM |
743 | |
744 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
745 | copied = 0; | |
746 | ||
747 | do { | |
748 | u32 offset; | |
749 | ||
750 | /* | |
751 | * We need to check signals first, to get correct SIGURG | |
752 | * handling. FIXME: Need to check this doesn't impact 1003.1g | |
753 | * and move it down to the bottom of the loop | |
754 | */ | |
755 | if (signal_pending(current)) { | |
756 | if (copied) | |
757 | break; | |
758 | copied = timeo ? sock_intr_errno(timeo) : -EAGAIN; | |
759 | break; | |
760 | } | |
761 | ||
762 | /* Next get a buffer. */ | |
763 | ||
764 | skb = skb_peek(&sk->sk_receive_queue); | |
765 | if (skb) { | |
766 | offset = *seq; | |
767 | goto found_ok_skb; | |
768 | } | |
769 | /* Well, if we have backlog, try to process it now yet. */ | |
770 | ||
771 | if (copied >= target && !sk->sk_backlog.tail) | |
772 | break; | |
773 | ||
774 | if (copied) { | |
775 | if (sk->sk_err || | |
776 | sk->sk_state == TCP_CLOSE || | |
777 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
778 | !timeo || | |
779 | (flags & MSG_PEEK)) | |
780 | break; | |
781 | } else { | |
782 | if (sock_flag(sk, SOCK_DONE)) | |
783 | break; | |
784 | ||
785 | if (sk->sk_err) { | |
786 | copied = sock_error(sk); | |
787 | break; | |
788 | } | |
789 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
790 | break; | |
791 | ||
29efcd26 | 792 | if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) { |
8420e1b5 ACM |
793 | if (!sock_flag(sk, SOCK_DONE)) { |
794 | /* | |
795 | * This occurs when user tries to read | |
796 | * from never connected socket. | |
797 | */ | |
798 | copied = -ENOTCONN; | |
799 | break; | |
800 | } | |
801 | break; | |
802 | } | |
803 | if (!timeo) { | |
804 | copied = -EAGAIN; | |
805 | break; | |
806 | } | |
807 | } | |
808 | ||
809 | if (copied >= target) { /* Do not sleep, just process backlog. */ | |
810 | release_sock(sk); | |
811 | lock_sock(sk); | |
812 | } else | |
dfbafc99 | 813 | sk_wait_data(sk, &timeo, NULL); |
8420e1b5 ACM |
814 | |
815 | if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) { | |
e87cc472 JP |
816 | net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n", |
817 | current->comm, | |
818 | task_pid_nr(current)); | |
8420e1b5 ACM |
819 | peek_seq = llc->copied_seq; |
820 | } | |
821 | continue; | |
822 | found_ok_skb: | |
4d231b76 | 823 | skb_len = skb->len; |
8420e1b5 ACM |
824 | /* Ok so how much can we use? */ |
825 | used = skb->len - offset; | |
826 | if (len < used) | |
827 | used = len; | |
828 | ||
829 | if (!(flags & MSG_TRUNC)) { | |
51f3d02b | 830 | int rc = skb_copy_datagram_msg(skb, offset, msg, used); |
8420e1b5 ACM |
831 | if (rc) { |
832 | /* Exception. Bailout! */ | |
833 | if (!copied) | |
834 | copied = -EFAULT; | |
835 | break; | |
836 | } | |
837 | } | |
838 | ||
839 | *seq += used; | |
840 | copied += used; | |
841 | len -= used; | |
842 | ||
9cef310f AJ |
843 | /* For non stream protcols we get one packet per recvmsg call */ |
844 | if (sk->sk_type != SOCK_STREAM) | |
845 | goto copy_uaddr; | |
846 | ||
8420e1b5 | 847 | if (!(flags & MSG_PEEK)) { |
56ac11cf | 848 | spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags); |
7bced397 | 849 | sk_eat_skb(sk, skb); |
56ac11cf | 850 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags); |
8420e1b5 ACM |
851 | *seq = 0; |
852 | } | |
30a584d9 | 853 | |
30a584d9 | 854 | /* Partial read */ |
4d231b76 | 855 | if (used + offset < skb_len) |
30a584d9 | 856 | continue; |
8420e1b5 ACM |
857 | } while (len > 0); |
858 | ||
1da177e4 LT |
859 | out: |
860 | release_sock(sk); | |
8420e1b5 ACM |
861 | return copied; |
862 | copy_uaddr: | |
863 | if (uaddr != NULL && skb != NULL) { | |
864 | memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr)); | |
865 | msg->msg_namelen = sizeof(*uaddr); | |
866 | } | |
e5cd6fe3 OP |
867 | if (llc_sk(sk)->cmsg_flags) |
868 | llc_cmsg_rcv(msg, skb); | |
9cef310f AJ |
869 | |
870 | if (!(flags & MSG_PEEK)) { | |
7bced397 DW |
871 | spin_lock_irqsave(&sk->sk_receive_queue.lock, cpu_flags); |
872 | sk_eat_skb(sk, skb); | |
873 | spin_unlock_irqrestore(&sk->sk_receive_queue.lock, cpu_flags); | |
874 | *seq = 0; | |
9cef310f AJ |
875 | } |
876 | ||
8420e1b5 | 877 | goto out; |
1da177e4 LT |
878 | } |
879 | ||
880 | /** | |
881 | * llc_ui_sendmsg - Transmit data provided by the socket user. | |
882 | * @sock: Socket to transmit data from. | |
883 | * @msg: Various user related information. | |
884 | * @len: Length of data to transmit. | |
885 | * | |
886 | * Transmit data provided by the socket user. | |
887 | * Returns non-negative upon success, negative otherwise. | |
888 | */ | |
1b784140 | 889 | static int llc_ui_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
1da177e4 LT |
890 | { |
891 | struct sock *sk = sock->sk; | |
892 | struct llc_sock *llc = llc_sk(sk); | |
342dfc30 | 893 | DECLARE_SOCKADDR(struct sockaddr_llc *, addr, msg->msg_name); |
1da177e4 LT |
894 | int flags = msg->msg_flags; |
895 | int noblock = flags & MSG_DONTWAIT; | |
1da177e4 LT |
896 | struct sk_buff *skb; |
897 | size_t size = 0; | |
898 | int rc = -EINVAL, copied = 0, hdrlen; | |
899 | ||
0dc47877 | 900 | dprintk("%s: sending from %02X to %02X\n", __func__, |
1da177e4 LT |
901 | llc->laddr.lsap, llc->daddr.lsap); |
902 | lock_sock(sk); | |
903 | if (addr) { | |
904 | if (msg->msg_namelen < sizeof(*addr)) | |
905 | goto release; | |
906 | } else { | |
907 | if (llc_ui_addr_null(&llc->addr)) | |
908 | goto release; | |
909 | addr = &llc->addr; | |
910 | } | |
911 | /* must bind connection to sap if user hasn't done it. */ | |
912 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
913 | /* bind to sap with null dev, exclusive. */ | |
914 | rc = llc_ui_autobind(sock, addr); | |
915 | if (rc) | |
916 | goto release; | |
917 | } | |
774ccb4f | 918 | hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr); |
1da177e4 | 919 | size = hdrlen + len; |
774ccb4f ACM |
920 | if (size > llc->dev->mtu) |
921 | size = llc->dev->mtu; | |
1da177e4 LT |
922 | copied = size - hdrlen; |
923 | release_sock(sk); | |
924 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
925 | lock_sock(sk); | |
926 | if (!skb) | |
927 | goto release; | |
774ccb4f | 928 | skb->dev = llc->dev; |
1da177e4 | 929 | skb->protocol = llc_proto_type(addr->sllc_arphrd); |
d57b1869 | 930 | skb_reserve(skb, hdrlen); |
6ce8e9ce | 931 | rc = memcpy_from_msg(skb_put(skb, copied), msg, copied); |
1da177e4 LT |
932 | if (rc) |
933 | goto out; | |
934 | if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) { | |
935 | llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac, | |
936 | addr->sllc_sap); | |
937 | goto out; | |
938 | } | |
939 | if (addr->sllc_test) { | |
940 | llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac, | |
941 | addr->sllc_sap); | |
942 | goto out; | |
943 | } | |
944 | if (addr->sllc_xid) { | |
945 | llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac, | |
946 | addr->sllc_sap); | |
947 | goto out; | |
948 | } | |
949 | rc = -ENOPROTOOPT; | |
950 | if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua)) | |
951 | goto out; | |
952 | rc = llc_ui_send_data(sk, skb, noblock); | |
1da177e4 | 953 | out: |
249ff1c6 | 954 | if (rc) { |
1da177e4 LT |
955 | kfree_skb(skb); |
956 | release: | |
1da177e4 | 957 | dprintk("%s: failed sending from %02X to %02X: %d\n", |
0dc47877 | 958 | __func__, llc->laddr.lsap, llc->daddr.lsap, rc); |
249ff1c6 | 959 | } |
1da177e4 LT |
960 | release_sock(sk); |
961 | return rc ? : copied; | |
962 | } | |
963 | ||
964 | /** | |
965 | * llc_ui_getname - return the address info of a socket | |
966 | * @sock: Socket to get address of. | |
967 | * @uaddr: Address structure to return information. | |
968 | * @uaddrlen: Length of address structure. | |
969 | * @peer: Does user want local or remote address information. | |
970 | * | |
971 | * Return the address information of a socket. | |
972 | */ | |
973 | static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr, | |
974 | int *uaddrlen, int peer) | |
975 | { | |
976 | struct sockaddr_llc sllc; | |
977 | struct sock *sk = sock->sk; | |
978 | struct llc_sock *llc = llc_sk(sk); | |
3592aaeb | 979 | int rc = -EBADF; |
1da177e4 | 980 | |
28e9fc59 | 981 | memset(&sllc, 0, sizeof(sllc)); |
1da177e4 LT |
982 | lock_sock(sk); |
983 | if (sock_flag(sk, SOCK_ZAPPED)) | |
984 | goto out; | |
985 | *uaddrlen = sizeof(sllc); | |
1da177e4 LT |
986 | if (peer) { |
987 | rc = -ENOTCONN; | |
988 | if (sk->sk_state != TCP_ESTABLISHED) | |
989 | goto out; | |
990 | if(llc->dev) | |
991 | sllc.sllc_arphrd = llc->dev->type; | |
992 | sllc.sllc_sap = llc->daddr.lsap; | |
993 | memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN); | |
994 | } else { | |
995 | rc = -EINVAL; | |
996 | if (!llc->sap) | |
997 | goto out; | |
998 | sllc.sllc_sap = llc->sap->laddr.lsap; | |
999 | ||
1000 | if (llc->dev) { | |
1001 | sllc.sllc_arphrd = llc->dev->type; | |
a186d2ae | 1002 | memcpy(&sllc.sllc_mac, llc->dev->dev_addr, |
1da177e4 LT |
1003 | IFHWADDRLEN); |
1004 | } | |
1005 | } | |
1006 | rc = 0; | |
1007 | sllc.sllc_family = AF_LLC; | |
1008 | memcpy(uaddr, &sllc, sizeof(sllc)); | |
1009 | out: | |
1010 | release_sock(sk); | |
1011 | return rc; | |
1012 | } | |
1013 | ||
1014 | /** | |
1015 | * llc_ui_ioctl - io controls for PF_LLC | |
1016 | * @sock: Socket to get/set info | |
1017 | * @cmd: command | |
1018 | * @arg: optional argument for cmd | |
1019 | * | |
1020 | * get/set info on llc sockets | |
1021 | */ | |
1022 | static int llc_ui_ioctl(struct socket *sock, unsigned int cmd, | |
1023 | unsigned long arg) | |
1024 | { | |
b5e5fa5e | 1025 | return -ENOIOCTLCMD; |
1da177e4 LT |
1026 | } |
1027 | ||
1028 | /** | |
1029 | * llc_ui_setsockopt - set various connection specific parameters. | |
1030 | * @sock: Socket to set options on. | |
1031 | * @level: Socket level user is requesting operations on. | |
1032 | * @optname: Operation name. | |
2c53040f | 1033 | * @optval: User provided operation data. |
1da177e4 LT |
1034 | * @optlen: Length of optval. |
1035 | * | |
1036 | * Set various connection specific parameters. | |
1037 | */ | |
1038 | static int llc_ui_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1039 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
1040 | { |
1041 | struct sock *sk = sock->sk; | |
1042 | struct llc_sock *llc = llc_sk(sk); | |
339db11b DC |
1043 | unsigned int opt; |
1044 | int rc = -EINVAL; | |
1da177e4 LT |
1045 | |
1046 | lock_sock(sk); | |
af426d32 | 1047 | if (unlikely(level != SOL_LLC || optlen != sizeof(int))) |
1da177e4 LT |
1048 | goto out; |
1049 | rc = get_user(opt, (int __user *)optval); | |
1050 | if (rc) | |
1051 | goto out; | |
1052 | rc = -EINVAL; | |
1053 | switch (optname) { | |
1054 | case LLC_OPT_RETRY: | |
1055 | if (opt > LLC_OPT_MAX_RETRY) | |
1056 | goto out; | |
1057 | llc->n2 = opt; | |
1058 | break; | |
1059 | case LLC_OPT_SIZE: | |
1060 | if (opt > LLC_OPT_MAX_SIZE) | |
1061 | goto out; | |
1062 | llc->n1 = opt; | |
1063 | break; | |
1064 | case LLC_OPT_ACK_TMR_EXP: | |
1065 | if (opt > LLC_OPT_MAX_ACK_TMR_EXP) | |
1066 | goto out; | |
590232a7 | 1067 | llc->ack_timer.expire = opt * HZ; |
1da177e4 LT |
1068 | break; |
1069 | case LLC_OPT_P_TMR_EXP: | |
1070 | if (opt > LLC_OPT_MAX_P_TMR_EXP) | |
1071 | goto out; | |
590232a7 | 1072 | llc->pf_cycle_timer.expire = opt * HZ; |
1da177e4 LT |
1073 | break; |
1074 | case LLC_OPT_REJ_TMR_EXP: | |
1075 | if (opt > LLC_OPT_MAX_REJ_TMR_EXP) | |
1076 | goto out; | |
590232a7 | 1077 | llc->rej_sent_timer.expire = opt * HZ; |
1da177e4 LT |
1078 | break; |
1079 | case LLC_OPT_BUSY_TMR_EXP: | |
1080 | if (opt > LLC_OPT_MAX_BUSY_TMR_EXP) | |
1081 | goto out; | |
590232a7 | 1082 | llc->busy_state_timer.expire = opt * HZ; |
1da177e4 LT |
1083 | break; |
1084 | case LLC_OPT_TX_WIN: | |
1085 | if (opt > LLC_OPT_MAX_WIN) | |
1086 | goto out; | |
1087 | llc->k = opt; | |
1088 | break; | |
1089 | case LLC_OPT_RX_WIN: | |
1090 | if (opt > LLC_OPT_MAX_WIN) | |
1091 | goto out; | |
1092 | llc->rw = opt; | |
1093 | break; | |
e5cd6fe3 OP |
1094 | case LLC_OPT_PKTINFO: |
1095 | if (opt) | |
1096 | llc->cmsg_flags |= LLC_CMSG_PKTINFO; | |
1097 | else | |
1098 | llc->cmsg_flags &= ~LLC_CMSG_PKTINFO; | |
1099 | break; | |
1da177e4 LT |
1100 | default: |
1101 | rc = -ENOPROTOOPT; | |
1102 | goto out; | |
1103 | } | |
1104 | rc = 0; | |
1105 | out: | |
1106 | release_sock(sk); | |
1107 | return rc; | |
1108 | } | |
1109 | ||
1110 | /** | |
1111 | * llc_ui_getsockopt - get connection specific socket info | |
1112 | * @sock: Socket to get information from. | |
1113 | * @level: Socket level user is requesting operations on. | |
1114 | * @optname: Operation name. | |
1115 | * @optval: Variable to return operation data in. | |
1116 | * @optlen: Length of optval. | |
1117 | * | |
1118 | * Get connection specific socket information. | |
1119 | */ | |
1120 | static int llc_ui_getsockopt(struct socket *sock, int level, int optname, | |
1121 | char __user *optval, int __user *optlen) | |
1122 | { | |
1123 | struct sock *sk = sock->sk; | |
1124 | struct llc_sock *llc = llc_sk(sk); | |
1125 | int val = 0, len = 0, rc = -EINVAL; | |
1126 | ||
1127 | lock_sock(sk); | |
af426d32 | 1128 | if (unlikely(level != SOL_LLC)) |
1da177e4 LT |
1129 | goto out; |
1130 | rc = get_user(len, optlen); | |
1131 | if (rc) | |
1132 | goto out; | |
1133 | rc = -EINVAL; | |
1134 | if (len != sizeof(int)) | |
1135 | goto out; | |
1136 | switch (optname) { | |
1137 | case LLC_OPT_RETRY: | |
590232a7 | 1138 | val = llc->n2; break; |
1da177e4 | 1139 | case LLC_OPT_SIZE: |
590232a7 | 1140 | val = llc->n1; break; |
1da177e4 | 1141 | case LLC_OPT_ACK_TMR_EXP: |
590232a7 | 1142 | val = llc->ack_timer.expire / HZ; break; |
1da177e4 | 1143 | case LLC_OPT_P_TMR_EXP: |
590232a7 | 1144 | val = llc->pf_cycle_timer.expire / HZ; break; |
1da177e4 | 1145 | case LLC_OPT_REJ_TMR_EXP: |
590232a7 | 1146 | val = llc->rej_sent_timer.expire / HZ; break; |
1da177e4 | 1147 | case LLC_OPT_BUSY_TMR_EXP: |
590232a7 | 1148 | val = llc->busy_state_timer.expire / HZ; break; |
1da177e4 LT |
1149 | case LLC_OPT_TX_WIN: |
1150 | val = llc->k; break; | |
1151 | case LLC_OPT_RX_WIN: | |
1152 | val = llc->rw; break; | |
e5cd6fe3 OP |
1153 | case LLC_OPT_PKTINFO: |
1154 | val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0; | |
1155 | break; | |
1da177e4 LT |
1156 | default: |
1157 | rc = -ENOPROTOOPT; | |
1158 | goto out; | |
1159 | } | |
1160 | rc = 0; | |
1161 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) | |
1162 | rc = -EFAULT; | |
1163 | out: | |
1164 | release_sock(sk); | |
1165 | return rc; | |
1166 | } | |
1167 | ||
ec1b4cf7 | 1168 | static const struct net_proto_family llc_ui_family_ops = { |
1da177e4 LT |
1169 | .family = PF_LLC, |
1170 | .create = llc_ui_create, | |
1171 | .owner = THIS_MODULE, | |
1172 | }; | |
1173 | ||
90ddc4f0 | 1174 | static const struct proto_ops llc_ui_ops = { |
1da177e4 LT |
1175 | .family = PF_LLC, |
1176 | .owner = THIS_MODULE, | |
1177 | .release = llc_ui_release, | |
1178 | .bind = llc_ui_bind, | |
1179 | .connect = llc_ui_connect, | |
1180 | .socketpair = sock_no_socketpair, | |
1181 | .accept = llc_ui_accept, | |
1182 | .getname = llc_ui_getname, | |
1183 | .poll = datagram_poll, | |
1184 | .ioctl = llc_ui_ioctl, | |
1185 | .listen = llc_ui_listen, | |
1186 | .shutdown = llc_ui_shutdown, | |
1187 | .setsockopt = llc_ui_setsockopt, | |
1188 | .getsockopt = llc_ui_getsockopt, | |
1189 | .sendmsg = llc_ui_sendmsg, | |
1190 | .recvmsg = llc_ui_recvmsg, | |
1191 | .mmap = sock_no_mmap, | |
1192 | .sendpage = sock_no_sendpage, | |
1193 | }; | |
1194 | ||
01af4a0e | 1195 | static const char llc_proc_err_msg[] __initconst = |
d57b1869 | 1196 | KERN_CRIT "LLC: Unable to register the proc_fs entries\n"; |
01af4a0e | 1197 | static const char llc_sysctl_err_msg[] __initconst = |
d57b1869 | 1198 | KERN_CRIT "LLC: Unable to register the sysctl entries\n"; |
01af4a0e | 1199 | static const char llc_sock_err_msg[] __initconst = |
d57b1869 | 1200 | KERN_CRIT "LLC: Unable to register the network family\n"; |
590232a7 | 1201 | |
1da177e4 LT |
1202 | static int __init llc2_init(void) |
1203 | { | |
1204 | int rc = proto_register(&llc_proto, 0); | |
1205 | ||
1206 | if (rc != 0) | |
1207 | goto out; | |
1208 | ||
1209 | llc_build_offset_table(); | |
1210 | llc_station_init(); | |
1211 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; | |
1212 | rc = llc_proc_init(); | |
590232a7 ACM |
1213 | if (rc != 0) { |
1214 | printk(llc_proc_err_msg); | |
f4f8720f | 1215 | goto out_station; |
590232a7 ACM |
1216 | } |
1217 | rc = llc_sysctl_init(); | |
1218 | if (rc) { | |
1219 | printk(llc_sysctl_err_msg); | |
1220 | goto out_proc; | |
1221 | } | |
1222 | rc = sock_register(&llc_ui_family_ops); | |
1223 | if (rc) { | |
1224 | printk(llc_sock_err_msg); | |
1225 | goto out_sysctl; | |
1226 | } | |
1da177e4 LT |
1227 | llc_add_pack(LLC_DEST_SAP, llc_sap_handler); |
1228 | llc_add_pack(LLC_DEST_CONN, llc_conn_handler); | |
1229 | out: | |
1230 | return rc; | |
590232a7 ACM |
1231 | out_sysctl: |
1232 | llc_sysctl_exit(); | |
1233 | out_proc: | |
1234 | llc_proc_exit(); | |
f4f8720f BH |
1235 | out_station: |
1236 | llc_station_exit(); | |
1da177e4 LT |
1237 | proto_unregister(&llc_proto); |
1238 | goto out; | |
1239 | } | |
1240 | ||
1241 | static void __exit llc2_exit(void) | |
1242 | { | |
1243 | llc_station_exit(); | |
1244 | llc_remove_pack(LLC_DEST_SAP); | |
1245 | llc_remove_pack(LLC_DEST_CONN); | |
1246 | sock_unregister(PF_LLC); | |
1247 | llc_proc_exit(); | |
590232a7 | 1248 | llc_sysctl_exit(); |
1da177e4 LT |
1249 | proto_unregister(&llc_proto); |
1250 | } | |
1251 | ||
1252 | module_init(llc2_init); | |
1253 | module_exit(llc2_exit); | |
1254 | ||
1255 | MODULE_LICENSE("GPL"); | |
1256 | MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003"); | |
1257 | MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support"); | |
1258 | MODULE_ALIAS_NETPROTO(PF_LLC); |