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