]>
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 | |
c535f920 | 50 | #define dprintk(args...) do {} while (0) |
1da177e4 LT |
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 | ||
c7c9d210 | 101 | if (addr->sllc_test) |
1da177e4 | 102 | rc = LLC_PDU_LEN_U; |
c7c9d210 PS |
103 | else if (addr->sllc_xid) |
104 | /* We need to expand header to sizeof(struct llc_xid_info) | |
105 | * since llc_pdu_init_as_xid_cmd() sets 4,5,6 bytes of LLC header | |
106 | * as XID PDU. In llc_ui_sendmsg() we reserved header size and then | |
107 | * filled all other space with user data. If we won't reserve this | |
108 | * bytes, llc_pdu_init_as_xid_cmd() will overwrite user data | |
109 | */ | |
110 | rc = LLC_PDU_LEN_U_XID; | |
1da177e4 LT |
111 | else if (sk->sk_type == SOCK_STREAM) |
112 | rc = LLC_PDU_LEN_I; | |
113 | return rc; | |
114 | } | |
115 | ||
116 | /** | |
117 | * llc_ui_send_data - send data via reliable llc2 connection | |
118 | * @sk: Connection the socket is using. | |
119 | * @skb: Data the user wishes to send. | |
1da177e4 LT |
120 | * @noblock: can we block waiting for data? |
121 | * | |
122 | * Send data via reliable llc2 connection. | |
123 | * Returns 0 upon success, non-zero if action did not succeed. | |
fc8d5db1 EB |
124 | * |
125 | * This function always consumes a reference to the skb. | |
1da177e4 LT |
126 | */ |
127 | static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock) | |
128 | { | |
129 | struct llc_sock* llc = llc_sk(sk); | |
1da177e4 | 130 | |
d57b1869 | 131 | if (unlikely(llc_data_accept_state(llc->state) || |
451677c4 JF |
132 | llc->remote_busy_flag || |
133 | llc->p_flag)) { | |
54fb7f25 | 134 | long timeout = sock_sndtimeo(sk, noblock); |
fc8d5db1 | 135 | int rc; |
1da177e4 LT |
136 | |
137 | rc = llc_ui_wait_for_busy_core(sk, timeout); | |
fc8d5db1 EB |
138 | if (rc) { |
139 | kfree_skb(skb); | |
140 | return rc; | |
141 | } | |
1da177e4 | 142 | } |
fc8d5db1 | 143 | return llc_build_and_send_pkt(sk, skb); |
1da177e4 LT |
144 | } |
145 | ||
146 | static void llc_ui_sk_init(struct socket *sock, struct sock *sk) | |
147 | { | |
ee5850de | 148 | sock_graft(sk, sock); |
1da177e4 | 149 | sk->sk_type = sock->type; |
1da177e4 LT |
150 | sock->ops = &llc_ui_ops; |
151 | } | |
152 | ||
153 | static struct proto llc_proto = { | |
9c005e01 | 154 | .name = "LLC", |
1da177e4 LT |
155 | .owner = THIS_MODULE, |
156 | .obj_size = sizeof(struct llc_sock), | |
5f0d5a3a | 157 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
1da177e4 LT |
158 | }; |
159 | ||
160 | /** | |
161 | * llc_ui_create - alloc and init a new llc_ui socket | |
3f378b68 | 162 | * @net: network namespace (must be default network) |
1da177e4 LT |
163 | * @sock: Socket to initialize and attach allocated sk to. |
164 | * @protocol: Unused. | |
3f378b68 | 165 | * @kern: on behalf of kernel or userspace |
1da177e4 LT |
166 | * |
167 | * Allocate and initialize a new llc_ui socket, validate the user wants a | |
168 | * socket type we have available. | |
169 | * Returns 0 upon success, negative upon failure. | |
170 | */ | |
3f378b68 EP |
171 | static int llc_ui_create(struct net *net, struct socket *sock, int protocol, |
172 | int kern) | |
1da177e4 LT |
173 | { |
174 | struct sock *sk; | |
175 | int rc = -ESOCKTNOSUPPORT; | |
176 | ||
df008c91 | 177 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
3480c63b PM |
178 | return -EPERM; |
179 | ||
09ad9bc7 | 180 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
181 | return -EAFNOSUPPORT; |
182 | ||
af426d32 | 183 | if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) { |
1da177e4 | 184 | rc = -ENOMEM; |
11aa9c28 | 185 | sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto, kern); |
1da177e4 LT |
186 | if (sk) { |
187 | rc = 0; | |
188 | llc_ui_sk_init(sock, sk); | |
189 | } | |
190 | } | |
191 | return rc; | |
192 | } | |
193 | ||
194 | /** | |
195 | * llc_ui_release - shutdown socket | |
196 | * @sock: Socket to release. | |
197 | * | |
198 | * Shutdown and deallocate an existing socket. | |
199 | */ | |
200 | static int llc_ui_release(struct socket *sock) | |
201 | { | |
202 | struct sock *sk = sock->sk; | |
203 | struct llc_sock *llc; | |
204 | ||
af426d32 | 205 | if (unlikely(sk == NULL)) |
1da177e4 LT |
206 | goto out; |
207 | sock_hold(sk); | |
208 | lock_sock(sk); | |
209 | llc = llc_sk(sk); | |
0dc47877 | 210 | dprintk("%s: closing local(%02X) remote(%02X)\n", __func__, |
1da177e4 LT |
211 | llc->laddr.lsap, llc->daddr.lsap); |
212 | if (!llc_send_disc(sk)) | |
213 | llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); | |
3a04ce71 CW |
214 | if (!sock_flag(sk, SOCK_ZAPPED)) { |
215 | struct llc_sap *sap = llc->sap; | |
216 | ||
217 | /* Hold this for release_sock(), so that llc_backlog_rcv() | |
218 | * could still use it. | |
219 | */ | |
220 | llc_sap_hold(sap); | |
1da177e4 | 221 | llc_sap_remove_socket(llc->sap, sk); |
3a04ce71 CW |
222 | release_sock(sk); |
223 | llc_sap_put(sap); | |
224 | } else { | |
225 | release_sock(sk); | |
226 | } | |
d62607c3 | 227 | netdev_put(llc->dev, &llc->dev_tracker); |
1da177e4 LT |
228 | sock_put(sk); |
229 | llc_sk_free(sk); | |
230 | out: | |
231 | return 0; | |
232 | } | |
233 | ||
234 | /** | |
235 | * llc_ui_autoport - provide dynamically allocate SAP number | |
236 | * | |
237 | * Provide the caller with a dynamically allocated SAP number according | |
238 | * to the rules that are set in this function. Returns: 0, upon failure, | |
239 | * SAP number otherwise. | |
240 | */ | |
241 | static int llc_ui_autoport(void) | |
242 | { | |
243 | struct llc_sap *sap; | |
244 | int i, tries = 0; | |
245 | ||
246 | while (tries < LLC_SAP_DYN_TRIES) { | |
247 | for (i = llc_ui_sap_last_autoport; | |
248 | i < LLC_SAP_DYN_STOP; i += 2) { | |
249 | sap = llc_sap_find(i); | |
250 | if (!sap) { | |
251 | llc_ui_sap_last_autoport = i + 2; | |
252 | goto out; | |
253 | } | |
6e2144b7 | 254 | llc_sap_put(sap); |
1da177e4 LT |
255 | } |
256 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; | |
257 | tries++; | |
258 | } | |
259 | i = 0; | |
260 | out: | |
261 | return i; | |
262 | } | |
263 | ||
264 | /** | |
5a770c02 ACM |
265 | * llc_ui_autobind - automatically bind a socket to a sap |
266 | * @sock: socket to bind | |
267 | * @addr: address to connect to | |
268 | * | |
269 | * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't | |
270 | * specifically used llc_ui_bind to bind to an specific address/sap | |
1da177e4 | 271 | * |
1da177e4 LT |
272 | * Returns: 0 upon success, negative otherwise. |
273 | */ | |
274 | static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr) | |
275 | { | |
276 | struct sock *sk = sock->sk; | |
277 | struct llc_sock *llc = llc_sk(sk); | |
2d327a79 | 278 | struct net_device *dev = NULL; |
1da177e4 LT |
279 | struct llc_sap *sap; |
280 | int rc = -EINVAL; | |
281 | ||
282 | if (!sock_flag(sk, SOCK_ZAPPED)) | |
283 | goto out; | |
a9b11101 ED |
284 | if (!addr->sllc_arphrd) |
285 | addr->sllc_arphrd = ARPHRD_ETHER; | |
286 | if (addr->sllc_arphrd != ARPHRD_ETHER) | |
287 | goto out; | |
1da177e4 | 288 | rc = -ENODEV; |
abf9d537 | 289 | if (sk->sk_bound_dev_if) { |
2d327a79 ED |
290 | dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if); |
291 | if (dev && addr->sllc_arphrd != dev->type) { | |
292 | dev_put(dev); | |
293 | dev = NULL; | |
abf9d537 OP |
294 | } |
295 | } else | |
2d327a79 ED |
296 | dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd); |
297 | if (!dev) | |
1da177e4 LT |
298 | goto out; |
299 | rc = -EUSERS; | |
300 | llc->laddr.lsap = llc_ui_autoport(); | |
301 | if (!llc->laddr.lsap) | |
302 | goto out; | |
303 | rc = -EBUSY; /* some other network layer is using the sap */ | |
304 | sap = llc_sap_open(llc->laddr.lsap, NULL); | |
305 | if (!sap) | |
306 | goto out; | |
2d327a79 ED |
307 | |
308 | /* Note: We do not expect errors from this point. */ | |
309 | llc->dev = dev; | |
310 | netdev_tracker_alloc(llc->dev, &llc->dev_tracker, GFP_KERNEL); | |
311 | dev = NULL; | |
312 | ||
1da177e4 LT |
313 | memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN); |
314 | memcpy(&llc->addr, addr, sizeof(llc->addr)); | |
315 | /* assign new connection to its SAP */ | |
316 | llc_sap_add_socket(sap, sk); | |
317 | sock_reset_flag(sk, SOCK_ZAPPED); | |
318 | rc = 0; | |
319 | out: | |
2d327a79 | 320 | dev_put(dev); |
1da177e4 LT |
321 | return rc; |
322 | } | |
323 | ||
324 | /** | |
325 | * llc_ui_bind - bind a socket to a specific address. | |
326 | * @sock: Socket to bind an address to. | |
327 | * @uaddr: Address the user wants the socket bound to. | |
328 | * @addrlen: Length of the uaddr structure. | |
329 | * | |
330 | * Bind a socket to a specific address. For llc a user is able to bind to | |
5a770c02 | 331 | * a specific sap only or mac + sap. |
1da177e4 LT |
332 | * If the user desires to bind to a specific mac + sap, it is possible to |
333 | * have multiple sap connections via multiple macs. | |
334 | * Bind and autobind for that matter must enforce the correct sap usage | |
335 | * otherwise all hell will break loose. | |
336 | * Returns: 0 upon success, negative otherwise. | |
337 | */ | |
338 | static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen) | |
339 | { | |
340 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; | |
341 | struct sock *sk = sock->sk; | |
342 | struct llc_sock *llc = llc_sk(sk); | |
2d327a79 | 343 | struct net_device *dev = NULL; |
1da177e4 LT |
344 | struct llc_sap *sap; |
345 | int rc = -EINVAL; | |
346 | ||
0908cf4d | 347 | lock_sock(sk); |
af426d32 | 348 | if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr))) |
1da177e4 LT |
349 | goto out; |
350 | rc = -EAFNOSUPPORT; | |
a9b11101 ED |
351 | if (!addr->sllc_arphrd) |
352 | addr->sllc_arphrd = ARPHRD_ETHER; | |
353 | if (unlikely(addr->sllc_family != AF_LLC || addr->sllc_arphrd != ARPHRD_ETHER)) | |
1da177e4 | 354 | goto out; |
c68e747d | 355 | dprintk("%s: binding %02X\n", __func__, addr->sllc_sap); |
cf309e3f | 356 | rc = -ENODEV; |
941666c2 | 357 | rcu_read_lock(); |
abf9d537 | 358 | if (sk->sk_bound_dev_if) { |
2d327a79 ED |
359 | dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if); |
360 | if (dev) { | |
951fd874 | 361 | if (is_zero_ether_addr(addr->sllc_mac)) |
2d327a79 | 362 | memcpy(addr->sllc_mac, dev->dev_addr, |
abf9d537 | 363 | IFHWADDRLEN); |
2d327a79 | 364 | if (addr->sllc_arphrd != dev->type || |
951fd874 | 365 | !ether_addr_equal(addr->sllc_mac, |
2d327a79 | 366 | dev->dev_addr)) { |
abf9d537 | 367 | rc = -EINVAL; |
2d327a79 | 368 | dev = NULL; |
abf9d537 OP |
369 | } |
370 | } | |
2d327a79 ED |
371 | } else { |
372 | dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd, | |
abf9d537 | 373 | addr->sllc_mac); |
2d327a79 ED |
374 | } |
375 | dev_hold(dev); | |
941666c2 | 376 | rcu_read_unlock(); |
2d327a79 | 377 | if (!dev) |
cf309e3f | 378 | goto out; |
2d327a79 | 379 | |
1da177e4 LT |
380 | if (!addr->sllc_sap) { |
381 | rc = -EUSERS; | |
382 | addr->sllc_sap = llc_ui_autoport(); | |
383 | if (!addr->sllc_sap) | |
384 | goto out; | |
385 | } | |
386 | sap = llc_sap_find(addr->sllc_sap); | |
387 | if (!sap) { | |
388 | sap = llc_sap_open(addr->sllc_sap, NULL); | |
389 | rc = -EBUSY; /* some other network layer is using the sap */ | |
390 | if (!sap) | |
391 | goto out; | |
392 | } else { | |
393 | struct llc_addr laddr, daddr; | |
394 | struct sock *ask; | |
395 | ||
396 | memset(&laddr, 0, sizeof(laddr)); | |
397 | memset(&daddr, 0, sizeof(daddr)); | |
398 | /* | |
59c51591 | 399 | * FIXME: check if the address is multicast, |
1da177e4 LT |
400 | * only SOCK_DGRAM can do this. |
401 | */ | |
402 | memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
403 | laddr.lsap = addr->sllc_sap; | |
404 | rc = -EADDRINUSE; /* mac + sap clash. */ | |
97b1d320 | 405 | ask = llc_lookup_established(sap, &daddr, &laddr, &init_net); |
1da177e4 LT |
406 | if (ask) { |
407 | sock_put(ask); | |
6e2144b7 | 408 | goto out_put; |
1da177e4 LT |
409 | } |
410 | } | |
2d327a79 ED |
411 | |
412 | /* Note: We do not expect errors from this point. */ | |
413 | llc->dev = dev; | |
414 | netdev_tracker_alloc(llc->dev, &llc->dev_tracker, GFP_KERNEL); | |
415 | dev = NULL; | |
416 | ||
1da177e4 LT |
417 | llc->laddr.lsap = addr->sllc_sap; |
418 | memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
419 | memcpy(&llc->addr, addr, sizeof(llc->addr)); | |
420 | /* assign new connection to its SAP */ | |
421 | llc_sap_add_socket(sap, sk); | |
422 | sock_reset_flag(sk, SOCK_ZAPPED); | |
423 | rc = 0; | |
6e2144b7 ACM |
424 | out_put: |
425 | llc_sap_put(sap); | |
1da177e4 | 426 | out: |
2d327a79 | 427 | dev_put(dev); |
0908cf4d | 428 | release_sock(sk); |
1da177e4 LT |
429 | return rc; |
430 | } | |
431 | ||
432 | /** | |
433 | * llc_ui_shutdown - shutdown a connect llc2 socket. | |
434 | * @sock: Socket to shutdown. | |
435 | * @how: What part of the socket to shutdown. | |
436 | * | |
437 | * Shutdown a connected llc2 socket. Currently this function only supports | |
438 | * shutting down both sends and receives (2), we could probably make this | |
439 | * function such that a user can shutdown only half the connection but not | |
440 | * right now. | |
441 | * Returns: 0 upon success, negative otherwise. | |
442 | */ | |
443 | static int llc_ui_shutdown(struct socket *sock, int how) | |
444 | { | |
445 | struct sock *sk = sock->sk; | |
446 | int rc = -ENOTCONN; | |
447 | ||
448 | lock_sock(sk); | |
af426d32 | 449 | if (unlikely(sk->sk_state != TCP_ESTABLISHED)) |
1da177e4 LT |
450 | goto out; |
451 | rc = -EINVAL; | |
452 | if (how != 2) | |
453 | goto out; | |
454 | rc = llc_send_disc(sk); | |
455 | if (!rc) | |
456 | rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); | |
457 | /* Wake up anyone sleeping in poll */ | |
458 | sk->sk_state_change(sk); | |
459 | out: | |
460 | release_sock(sk); | |
461 | return rc; | |
462 | } | |
463 | ||
464 | /** | |
465 | * llc_ui_connect - Connect to a remote llc2 mac + sap. | |
466 | * @sock: Socket which will be connected to the remote destination. | |
467 | * @uaddr: Remote and possibly the local address of the new connection. | |
468 | * @addrlen: Size of uaddr structure. | |
469 | * @flags: Operational flags specified by the user. | |
470 | * | |
471 | * Connect to a remote llc2 mac + sap. The caller must specify the | |
472 | * destination mac and address to connect to. If the user hasn't previously | |
473 | * called bind(2) with a smac the address of the first interface of the | |
474 | * specified arp type will be used. | |
475 | * This function will autobind if user did not previously call bind. | |
476 | * Returns: 0 upon success, negative otherwise. | |
477 | */ | |
478 | static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr, | |
479 | int addrlen, int flags) | |
480 | { | |
481 | struct sock *sk = sock->sk; | |
482 | struct llc_sock *llc = llc_sk(sk); | |
483 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; | |
1da177e4 LT |
484 | int rc = -EINVAL; |
485 | ||
486 | lock_sock(sk); | |
af426d32 | 487 | if (unlikely(addrlen != sizeof(*addr))) |
1da177e4 LT |
488 | goto out; |
489 | rc = -EAFNOSUPPORT; | |
af426d32 ACM |
490 | if (unlikely(addr->sllc_family != AF_LLC)) |
491 | goto out; | |
492 | if (unlikely(sk->sk_type != SOCK_STREAM)) | |
493 | goto out; | |
494 | rc = -EALREADY; | |
495 | if (unlikely(sock->state == SS_CONNECTING)) | |
1da177e4 LT |
496 | goto out; |
497 | /* bind connection to sap if user hasn't done it. */ | |
498 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
499 | /* bind to sap with null dev, exclusive */ | |
500 | rc = llc_ui_autobind(sock, addr); | |
501 | if (rc) | |
502 | goto out; | |
1da177e4 | 503 | } |
5564af21 JF |
504 | llc->daddr.lsap = addr->sllc_sap; |
505 | memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN); | |
1da177e4 LT |
506 | sock->state = SS_CONNECTING; |
507 | sk->sk_state = TCP_SYN_SENT; | |
508 | llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap); | |
774ccb4f | 509 | rc = llc_establish_connection(sk, llc->dev->dev_addr, |
1da177e4 LT |
510 | addr->sllc_mac, addr->sllc_sap); |
511 | if (rc) { | |
0dc47877 | 512 | dprintk("%s: llc_ui_send_conn failed :-(\n", __func__); |
1da177e4 LT |
513 | sock->state = SS_UNCONNECTED; |
514 | sk->sk_state = TCP_CLOSE; | |
515 | goto out; | |
516 | } | |
b35bd110 ACM |
517 | |
518 | if (sk->sk_state == TCP_SYN_SENT) { | |
54fb7f25 | 519 | const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
b35bd110 ACM |
520 | |
521 | if (!timeo || !llc_ui_wait_for_conn(sk, timeo)) | |
522 | goto out; | |
523 | ||
524 | rc = sock_intr_errno(timeo); | |
525 | if (signal_pending(current)) | |
526 | goto out; | |
527 | } | |
528 | ||
529 | if (sk->sk_state == TCP_CLOSE) | |
530 | goto sock_error; | |
531 | ||
532 | sock->state = SS_CONNECTED; | |
533 | rc = 0; | |
1da177e4 LT |
534 | out: |
535 | release_sock(sk); | |
536 | return rc; | |
b35bd110 ACM |
537 | sock_error: |
538 | rc = sock_error(sk) ? : -ECONNABORTED; | |
539 | sock->state = SS_UNCONNECTED; | |
540 | goto out; | |
1da177e4 LT |
541 | } |
542 | ||
543 | /** | |
544 | * llc_ui_listen - allow a normal socket to accept incoming connections | |
545 | * @sock: Socket to allow incoming connections on. | |
546 | * @backlog: Number of connections to queue. | |
547 | * | |
548 | * Allow a normal socket to accept incoming connections. | |
549 | * Returns 0 upon success, negative otherwise. | |
550 | */ | |
551 | static int llc_ui_listen(struct socket *sock, int backlog) | |
552 | { | |
553 | struct sock *sk = sock->sk; | |
554 | int rc = -EINVAL; | |
555 | ||
556 | lock_sock(sk); | |
af426d32 | 557 | if (unlikely(sock->state != SS_UNCONNECTED)) |
1da177e4 LT |
558 | goto out; |
559 | rc = -EOPNOTSUPP; | |
af426d32 | 560 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
1da177e4 LT |
561 | goto out; |
562 | rc = -EAGAIN; | |
563 | if (sock_flag(sk, SOCK_ZAPPED)) | |
564 | goto out; | |
565 | rc = 0; | |
95c96174 | 566 | if (!(unsigned int)backlog) /* BSDism */ |
1da177e4 LT |
567 | backlog = 1; |
568 | sk->sk_max_ack_backlog = backlog; | |
569 | if (sk->sk_state != TCP_LISTEN) { | |
570 | sk->sk_ack_backlog = 0; | |
571 | sk->sk_state = TCP_LISTEN; | |
572 | } | |
573 | sk->sk_socket->flags |= __SO_ACCEPTCON; | |
574 | out: | |
575 | release_sock(sk); | |
576 | return rc; | |
577 | } | |
578 | ||
54fb7f25 | 579 | static int llc_ui_wait_for_disc(struct sock *sk, long timeout) |
1da177e4 | 580 | { |
d9dc8b0f | 581 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
b35bd110 | 582 | int rc = 0; |
1da177e4 | 583 | |
d9dc8b0f | 584 | add_wait_queue(sk_sleep(sk), &wait); |
54fb7f25 | 585 | while (1) { |
d0ac89f6 ED |
586 | if (sk_wait_event(sk, &timeout, |
587 | READ_ONCE(sk->sk_state) == TCP_CLOSE, &wait)) | |
54fb7f25 | 588 | break; |
1da177e4 LT |
589 | rc = -ERESTARTSYS; |
590 | if (signal_pending(current)) | |
591 | break; | |
592 | rc = -EAGAIN; | |
593 | if (!timeout) | |
594 | break; | |
b35bd110 | 595 | rc = 0; |
1da177e4 | 596 | } |
d9dc8b0f | 597 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
598 | return rc; |
599 | } | |
600 | ||
5ff904d5 | 601 | static bool llc_ui_wait_for_conn(struct sock *sk, long timeout) |
1da177e4 | 602 | { |
d9dc8b0f | 603 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
1da177e4 | 604 | |
d9dc8b0f | 605 | add_wait_queue(sk_sleep(sk), &wait); |
54fb7f25 | 606 | while (1) { |
d0ac89f6 ED |
607 | if (sk_wait_event(sk, &timeout, |
608 | READ_ONCE(sk->sk_state) != TCP_SYN_SENT, &wait)) | |
54fb7f25 | 609 | break; |
b35bd110 | 610 | if (signal_pending(current) || !timeout) |
1da177e4 LT |
611 | break; |
612 | } | |
d9dc8b0f | 613 | remove_wait_queue(sk_sleep(sk), &wait); |
b35bd110 | 614 | return timeout; |
1da177e4 LT |
615 | } |
616 | ||
afdbe357 | 617 | static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout) |
1da177e4 | 618 | { |
d9dc8b0f | 619 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
afdbe357 ACM |
620 | struct llc_sock *llc = llc_sk(sk); |
621 | int rc; | |
1da177e4 | 622 | |
d9dc8b0f | 623 | add_wait_queue(sk_sleep(sk), &wait); |
54fb7f25 | 624 | while (1) { |
afdbe357 | 625 | rc = 0; |
54fb7f25 | 626 | if (sk_wait_event(sk, &timeout, |
d0ac89f6 | 627 | (READ_ONCE(sk->sk_shutdown) & RCV_SHUTDOWN) || |
afdbe357 | 628 | (!llc_data_accept_state(llc->state) && |
451677c4 | 629 | !llc->remote_busy_flag && |
d9dc8b0f | 630 | !llc->p_flag), &wait)) |
1da177e4 | 631 | break; |
1da177e4 LT |
632 | rc = -ERESTARTSYS; |
633 | if (signal_pending(current)) | |
634 | break; | |
635 | rc = -EAGAIN; | |
636 | if (!timeout) | |
637 | break; | |
638 | } | |
d9dc8b0f | 639 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
640 | return rc; |
641 | } | |
642 | ||
2928c19e | 643 | static int llc_wait_data(struct sock *sk, long timeo) |
1da177e4 | 644 | { |
1da177e4 LT |
645 | int rc; |
646 | ||
54fb7f25 | 647 | while (1) { |
afdbe357 ACM |
648 | /* |
649 | * POSIX 1003.1g mandates this order. | |
650 | */ | |
c1cbe4b7 BL |
651 | rc = sock_error(sk); |
652 | if (rc) | |
afdbe357 | 653 | break; |
1da177e4 | 654 | rc = 0; |
afdbe357 | 655 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
1da177e4 | 656 | break; |
afdbe357 ACM |
657 | rc = -EAGAIN; |
658 | if (!timeo) | |
659 | break; | |
660 | rc = sock_intr_errno(timeo); | |
1da177e4 LT |
661 | if (signal_pending(current)) |
662 | break; | |
afdbe357 | 663 | rc = 0; |
dfbafc99 | 664 | if (sk_wait_data(sk, &timeo, NULL)) |
1da177e4 LT |
665 | break; |
666 | } | |
1da177e4 LT |
667 | return rc; |
668 | } | |
669 | ||
e5cd6fe3 OP |
670 | static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb) |
671 | { | |
672 | struct llc_sock *llc = llc_sk(skb->sk); | |
673 | ||
674 | if (llc->cmsg_flags & LLC_CMSG_PKTINFO) { | |
675 | struct llc_pktinfo info; | |
676 | ||
b8670c09 | 677 | memset(&info, 0, sizeof(info)); |
e5cd6fe3 OP |
678 | info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex; |
679 | llc_pdu_decode_dsap(skb, &info.lpi_sap); | |
680 | llc_pdu_decode_da(skb, info.lpi_mac); | |
681 | put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info); | |
682 | } | |
683 | } | |
684 | ||
1da177e4 LT |
685 | /** |
686 | * llc_ui_accept - accept a new incoming connection. | |
687 | * @sock: Socket which connections arrive on. | |
688 | * @newsock: Socket to move incoming connection to. | |
689 | * @flags: User specified operational flags. | |
cdfbabfb | 690 | * @kern: If the socket is kernel internal |
1da177e4 LT |
691 | * |
692 | * Accept a new incoming connection. | |
693 | * Returns 0 upon success, negative otherwise. | |
694 | */ | |
cdfbabfb DH |
695 | static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags, |
696 | bool kern) | |
1da177e4 LT |
697 | { |
698 | struct sock *sk = sock->sk, *newsk; | |
699 | struct llc_sock *llc, *newllc; | |
700 | struct sk_buff *skb; | |
701 | int rc = -EOPNOTSUPP; | |
702 | ||
0dc47877 | 703 | dprintk("%s: accepting on %02X\n", __func__, |
d57b1869 | 704 | llc_sk(sk)->laddr.lsap); |
1da177e4 | 705 | lock_sock(sk); |
af426d32 | 706 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
1da177e4 LT |
707 | goto out; |
708 | rc = -EINVAL; | |
af426d32 ACM |
709 | if (unlikely(sock->state != SS_UNCONNECTED || |
710 | sk->sk_state != TCP_LISTEN)) | |
1da177e4 LT |
711 | goto out; |
712 | /* wait for a connection to arrive. */ | |
b35bd110 | 713 | if (skb_queue_empty(&sk->sk_receive_queue)) { |
afdbe357 | 714 | rc = llc_wait_data(sk, sk->sk_rcvtimeo); |
b35bd110 ACM |
715 | if (rc) |
716 | goto out; | |
717 | } | |
0dc47877 | 718 | dprintk("%s: got a new connection on %02X\n", __func__, |
d57b1869 | 719 | llc_sk(sk)->laddr.lsap); |
1da177e4 LT |
720 | skb = skb_dequeue(&sk->sk_receive_queue); |
721 | rc = -EINVAL; | |
722 | if (!skb->sk) | |
723 | goto frees; | |
724 | rc = 0; | |
725 | newsk = skb->sk; | |
726 | /* attach connection to a new socket. */ | |
727 | llc_ui_sk_init(newsock, newsk); | |
728 | sock_reset_flag(newsk, SOCK_ZAPPED); | |
729 | newsk->sk_state = TCP_ESTABLISHED; | |
730 | newsock->state = SS_CONNECTED; | |
731 | llc = llc_sk(sk); | |
732 | newllc = llc_sk(newsk); | |
733 | memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr)); | |
734 | newllc->link = llc_ui_next_link_no(newllc->laddr.lsap); | |
735 | ||
736 | /* put original socket back into a clean listen state. */ | |
737 | sk->sk_state = TCP_LISTEN; | |
7976a11b | 738 | sk_acceptq_removed(sk); |
0dc47877 | 739 | dprintk("%s: ok success on %02X, client on %02X\n", __func__, |
1da177e4 LT |
740 | llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap); |
741 | frees: | |
742 | kfree_skb(skb); | |
743 | out: | |
744 | release_sock(sk); | |
745 | return rc; | |
746 | } | |
747 | ||
748 | /** | |
749 | * llc_ui_recvmsg - copy received data to the socket user. | |
750 | * @sock: Socket to copy data from. | |
751 | * @msg: Various user space related information. | |
8420e1b5 | 752 | * @len: Size of user buffer. |
1da177e4 LT |
753 | * @flags: User specified flags. |
754 | * | |
755 | * Copy received data to the socket user. | |
756 | * Returns non-negative upon success, negative otherwise. | |
757 | */ | |
1b784140 YX |
758 | static int llc_ui_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, |
759 | int flags) | |
1da177e4 | 760 | { |
342dfc30 | 761 | DECLARE_SOCKADDR(struct sockaddr_llc *, uaddr, msg->msg_name); |
8420e1b5 ACM |
762 | const int nonblock = flags & MSG_DONTWAIT; |
763 | struct sk_buff *skb = NULL; | |
764 | struct sock *sk = sock->sk; | |
765 | struct llc_sock *llc = llc_sk(sk); | |
1da177e4 | 766 | size_t copied = 0; |
8420e1b5 | 767 | u32 peek_seq = 0; |
4d231b76 | 768 | u32 *seq, skb_len; |
8420e1b5 ACM |
769 | unsigned long used; |
770 | int target; /* Read at least this many bytes */ | |
771 | long timeo; | |
1da177e4 | 772 | |
1da177e4 | 773 | lock_sock(sk); |
8420e1b5 | 774 | copied = -ENOTCONN; |
29efcd26 | 775 | if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN)) |
1da177e4 | 776 | goto out; |
8420e1b5 ACM |
777 | |
778 | timeo = sock_rcvtimeo(sk, nonblock); | |
779 | ||
780 | seq = &llc->copied_seq; | |
781 | if (flags & MSG_PEEK) { | |
782 | peek_seq = llc->copied_seq; | |
783 | seq = &peek_seq; | |
d57b1869 | 784 | } |
8420e1b5 ACM |
785 | |
786 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); | |
787 | copied = 0; | |
788 | ||
789 | do { | |
790 | u32 offset; | |
791 | ||
792 | /* | |
793 | * We need to check signals first, to get correct SIGURG | |
794 | * handling. FIXME: Need to check this doesn't impact 1003.1g | |
795 | * and move it down to the bottom of the loop | |
796 | */ | |
797 | if (signal_pending(current)) { | |
798 | if (copied) | |
799 | break; | |
800 | copied = timeo ? sock_intr_errno(timeo) : -EAGAIN; | |
801 | break; | |
802 | } | |
803 | ||
804 | /* Next get a buffer. */ | |
805 | ||
806 | skb = skb_peek(&sk->sk_receive_queue); | |
807 | if (skb) { | |
808 | offset = *seq; | |
809 | goto found_ok_skb; | |
810 | } | |
811 | /* Well, if we have backlog, try to process it now yet. */ | |
812 | ||
9ed498c6 | 813 | if (copied >= target && !READ_ONCE(sk->sk_backlog.tail)) |
8420e1b5 ACM |
814 | break; |
815 | ||
816 | if (copied) { | |
817 | if (sk->sk_err || | |
818 | sk->sk_state == TCP_CLOSE || | |
819 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
820 | !timeo || | |
821 | (flags & MSG_PEEK)) | |
822 | break; | |
823 | } else { | |
824 | if (sock_flag(sk, SOCK_DONE)) | |
825 | break; | |
826 | ||
827 | if (sk->sk_err) { | |
828 | copied = sock_error(sk); | |
829 | break; | |
830 | } | |
831 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
832 | break; | |
833 | ||
29efcd26 | 834 | if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) { |
8420e1b5 ACM |
835 | if (!sock_flag(sk, SOCK_DONE)) { |
836 | /* | |
837 | * This occurs when user tries to read | |
838 | * from never connected socket. | |
839 | */ | |
840 | copied = -ENOTCONN; | |
841 | break; | |
842 | } | |
843 | break; | |
844 | } | |
845 | if (!timeo) { | |
846 | copied = -EAGAIN; | |
847 | break; | |
848 | } | |
849 | } | |
850 | ||
851 | if (copied >= target) { /* Do not sleep, just process backlog. */ | |
852 | release_sock(sk); | |
853 | lock_sock(sk); | |
854 | } else | |
dfbafc99 | 855 | sk_wait_data(sk, &timeo, NULL); |
8420e1b5 ACM |
856 | |
857 | if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) { | |
e87cc472 JP |
858 | net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n", |
859 | current->comm, | |
860 | task_pid_nr(current)); | |
8420e1b5 ACM |
861 | peek_seq = llc->copied_seq; |
862 | } | |
863 | continue; | |
864 | found_ok_skb: | |
4d231b76 | 865 | skb_len = skb->len; |
8420e1b5 ACM |
866 | /* Ok so how much can we use? */ |
867 | used = skb->len - offset; | |
868 | if (len < used) | |
869 | used = len; | |
870 | ||
871 | if (!(flags & MSG_TRUNC)) { | |
51f3d02b | 872 | int rc = skb_copy_datagram_msg(skb, offset, msg, used); |
8420e1b5 ACM |
873 | if (rc) { |
874 | /* Exception. Bailout! */ | |
875 | if (!copied) | |
876 | copied = -EFAULT; | |
877 | break; | |
878 | } | |
879 | } | |
880 | ||
881 | *seq += used; | |
882 | copied += used; | |
883 | len -= used; | |
884 | ||
9cef310f AJ |
885 | /* For non stream protcols we get one packet per recvmsg call */ |
886 | if (sk->sk_type != SOCK_STREAM) | |
887 | goto copy_uaddr; | |
888 | ||
8420e1b5 | 889 | if (!(flags & MSG_PEEK)) { |
604d415e ED |
890 | skb_unlink(skb, &sk->sk_receive_queue); |
891 | kfree_skb(skb); | |
8420e1b5 ACM |
892 | *seq = 0; |
893 | } | |
30a584d9 | 894 | |
30a584d9 | 895 | /* Partial read */ |
4d231b76 | 896 | if (used + offset < skb_len) |
30a584d9 | 897 | continue; |
8420e1b5 ACM |
898 | } while (len > 0); |
899 | ||
1da177e4 LT |
900 | out: |
901 | release_sock(sk); | |
8420e1b5 ACM |
902 | return copied; |
903 | copy_uaddr: | |
904 | if (uaddr != NULL && skb != NULL) { | |
905 | memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr)); | |
906 | msg->msg_namelen = sizeof(*uaddr); | |
907 | } | |
e5cd6fe3 OP |
908 | if (llc_sk(sk)->cmsg_flags) |
909 | llc_cmsg_rcv(msg, skb); | |
9cef310f AJ |
910 | |
911 | if (!(flags & MSG_PEEK)) { | |
604d415e ED |
912 | skb_unlink(skb, &sk->sk_receive_queue); |
913 | kfree_skb(skb); | |
7bced397 | 914 | *seq = 0; |
9cef310f AJ |
915 | } |
916 | ||
8420e1b5 | 917 | goto out; |
1da177e4 LT |
918 | } |
919 | ||
920 | /** | |
921 | * llc_ui_sendmsg - Transmit data provided by the socket user. | |
922 | * @sock: Socket to transmit data from. | |
923 | * @msg: Various user related information. | |
924 | * @len: Length of data to transmit. | |
925 | * | |
926 | * Transmit data provided by the socket user. | |
927 | * Returns non-negative upon success, negative otherwise. | |
928 | */ | |
1b784140 | 929 | static int llc_ui_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
1da177e4 LT |
930 | { |
931 | struct sock *sk = sock->sk; | |
932 | struct llc_sock *llc = llc_sk(sk); | |
342dfc30 | 933 | DECLARE_SOCKADDR(struct sockaddr_llc *, addr, msg->msg_name); |
1da177e4 LT |
934 | int flags = msg->msg_flags; |
935 | int noblock = flags & MSG_DONTWAIT; | |
fc8d5db1 | 936 | struct sk_buff *skb = NULL; |
1da177e4 LT |
937 | size_t size = 0; |
938 | int rc = -EINVAL, copied = 0, hdrlen; | |
939 | ||
0dc47877 | 940 | dprintk("%s: sending from %02X to %02X\n", __func__, |
1da177e4 LT |
941 | llc->laddr.lsap, llc->daddr.lsap); |
942 | lock_sock(sk); | |
943 | if (addr) { | |
944 | if (msg->msg_namelen < sizeof(*addr)) | |
fc8d5db1 | 945 | goto out; |
1da177e4 LT |
946 | } else { |
947 | if (llc_ui_addr_null(&llc->addr)) | |
fc8d5db1 | 948 | goto out; |
1da177e4 LT |
949 | addr = &llc->addr; |
950 | } | |
951 | /* must bind connection to sap if user hasn't done it. */ | |
952 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
953 | /* bind to sap with null dev, exclusive. */ | |
954 | rc = llc_ui_autobind(sock, addr); | |
955 | if (rc) | |
fc8d5db1 | 956 | goto out; |
1da177e4 | 957 | } |
774ccb4f | 958 | hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr); |
1da177e4 | 959 | size = hdrlen + len; |
774ccb4f ACM |
960 | if (size > llc->dev->mtu) |
961 | size = llc->dev->mtu; | |
1da177e4 | 962 | copied = size - hdrlen; |
2c5d5b13 ED |
963 | rc = -EINVAL; |
964 | if (copied < 0) | |
fc8d5db1 | 965 | goto out; |
1da177e4 LT |
966 | release_sock(sk); |
967 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
968 | lock_sock(sk); | |
969 | if (!skb) | |
fc8d5db1 | 970 | goto out; |
774ccb4f | 971 | skb->dev = llc->dev; |
1da177e4 | 972 | skb->protocol = llc_proto_type(addr->sllc_arphrd); |
d57b1869 | 973 | skb_reserve(skb, hdrlen); |
6ce8e9ce | 974 | rc = memcpy_from_msg(skb_put(skb, copied), msg, copied); |
1da177e4 LT |
975 | if (rc) |
976 | goto out; | |
977 | if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) { | |
978 | llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac, | |
979 | addr->sllc_sap); | |
fc8d5db1 | 980 | skb = NULL; |
1da177e4 LT |
981 | goto out; |
982 | } | |
983 | if (addr->sllc_test) { | |
984 | llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac, | |
985 | addr->sllc_sap); | |
fc8d5db1 | 986 | skb = NULL; |
1da177e4 LT |
987 | goto out; |
988 | } | |
989 | if (addr->sllc_xid) { | |
990 | llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac, | |
991 | addr->sllc_sap); | |
fc8d5db1 | 992 | skb = NULL; |
1da177e4 LT |
993 | goto out; |
994 | } | |
995 | rc = -ENOPROTOOPT; | |
996 | if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua)) | |
997 | goto out; | |
998 | rc = llc_ui_send_data(sk, skb, noblock); | |
fc8d5db1 | 999 | skb = NULL; |
1da177e4 | 1000 | out: |
fc8d5db1 EB |
1001 | kfree_skb(skb); |
1002 | if (rc) | |
1da177e4 | 1003 | dprintk("%s: failed sending from %02X to %02X: %d\n", |
0dc47877 | 1004 | __func__, llc->laddr.lsap, llc->daddr.lsap, rc); |
1da177e4 LT |
1005 | release_sock(sk); |
1006 | return rc ? : copied; | |
1007 | } | |
1008 | ||
1009 | /** | |
1010 | * llc_ui_getname - return the address info of a socket | |
1011 | * @sock: Socket to get address of. | |
1012 | * @uaddr: Address structure to return information. | |
1da177e4 LT |
1013 | * @peer: Does user want local or remote address information. |
1014 | * | |
1015 | * Return the address information of a socket. | |
1016 | */ | |
1017 | static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr, | |
9b2c45d4 | 1018 | int peer) |
1da177e4 LT |
1019 | { |
1020 | struct sockaddr_llc sllc; | |
1021 | struct sock *sk = sock->sk; | |
1022 | struct llc_sock *llc = llc_sk(sk); | |
3592aaeb | 1023 | int rc = -EBADF; |
1da177e4 | 1024 | |
28e9fc59 | 1025 | memset(&sllc, 0, sizeof(sllc)); |
1da177e4 LT |
1026 | lock_sock(sk); |
1027 | if (sock_flag(sk, SOCK_ZAPPED)) | |
1028 | goto out; | |
1da177e4 LT |
1029 | if (peer) { |
1030 | rc = -ENOTCONN; | |
1031 | if (sk->sk_state != TCP_ESTABLISHED) | |
1032 | goto out; | |
1033 | if(llc->dev) | |
1034 | sllc.sllc_arphrd = llc->dev->type; | |
1035 | sllc.sllc_sap = llc->daddr.lsap; | |
1036 | memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN); | |
1037 | } else { | |
1038 | rc = -EINVAL; | |
1039 | if (!llc->sap) | |
1040 | goto out; | |
1041 | sllc.sllc_sap = llc->sap->laddr.lsap; | |
1042 | ||
1043 | if (llc->dev) { | |
1044 | sllc.sllc_arphrd = llc->dev->type; | |
a186d2ae | 1045 | memcpy(&sllc.sllc_mac, llc->dev->dev_addr, |
1da177e4 LT |
1046 | IFHWADDRLEN); |
1047 | } | |
1048 | } | |
1da177e4 LT |
1049 | sllc.sllc_family = AF_LLC; |
1050 | memcpy(uaddr, &sllc, sizeof(sllc)); | |
9b2c45d4 | 1051 | rc = sizeof(sllc); |
1da177e4 LT |
1052 | out: |
1053 | release_sock(sk); | |
1054 | return rc; | |
1055 | } | |
1056 | ||
1057 | /** | |
1058 | * llc_ui_ioctl - io controls for PF_LLC | |
1059 | * @sock: Socket to get/set info | |
1060 | * @cmd: command | |
1061 | * @arg: optional argument for cmd | |
1062 | * | |
1063 | * get/set info on llc sockets | |
1064 | */ | |
1065 | static int llc_ui_ioctl(struct socket *sock, unsigned int cmd, | |
1066 | unsigned long arg) | |
1067 | { | |
b5e5fa5e | 1068 | return -ENOIOCTLCMD; |
1da177e4 LT |
1069 | } |
1070 | ||
1071 | /** | |
1072 | * llc_ui_setsockopt - set various connection specific parameters. | |
1073 | * @sock: Socket to set options on. | |
1074 | * @level: Socket level user is requesting operations on. | |
1075 | * @optname: Operation name. | |
2c53040f | 1076 | * @optval: User provided operation data. |
1da177e4 LT |
1077 | * @optlen: Length of optval. |
1078 | * | |
1079 | * Set various connection specific parameters. | |
1080 | */ | |
1081 | static int llc_ui_setsockopt(struct socket *sock, int level, int optname, | |
a7b75c5a | 1082 | sockptr_t optval, unsigned int optlen) |
1da177e4 LT |
1083 | { |
1084 | struct sock *sk = sock->sk; | |
1085 | struct llc_sock *llc = llc_sk(sk); | |
339db11b DC |
1086 | unsigned int opt; |
1087 | int rc = -EINVAL; | |
1da177e4 LT |
1088 | |
1089 | lock_sock(sk); | |
af426d32 | 1090 | if (unlikely(level != SOL_LLC || optlen != sizeof(int))) |
1da177e4 | 1091 | goto out; |
a7b75c5a | 1092 | rc = copy_from_sockptr(&opt, optval, sizeof(opt)); |
1da177e4 LT |
1093 | if (rc) |
1094 | goto out; | |
1095 | rc = -EINVAL; | |
1096 | switch (optname) { | |
1097 | case LLC_OPT_RETRY: | |
1098 | if (opt > LLC_OPT_MAX_RETRY) | |
1099 | goto out; | |
1100 | llc->n2 = opt; | |
1101 | break; | |
1102 | case LLC_OPT_SIZE: | |
1103 | if (opt > LLC_OPT_MAX_SIZE) | |
1104 | goto out; | |
1105 | llc->n1 = opt; | |
1106 | break; | |
1107 | case LLC_OPT_ACK_TMR_EXP: | |
1108 | if (opt > LLC_OPT_MAX_ACK_TMR_EXP) | |
1109 | goto out; | |
590232a7 | 1110 | llc->ack_timer.expire = opt * HZ; |
1da177e4 LT |
1111 | break; |
1112 | case LLC_OPT_P_TMR_EXP: | |
1113 | if (opt > LLC_OPT_MAX_P_TMR_EXP) | |
1114 | goto out; | |
590232a7 | 1115 | llc->pf_cycle_timer.expire = opt * HZ; |
1da177e4 LT |
1116 | break; |
1117 | case LLC_OPT_REJ_TMR_EXP: | |
1118 | if (opt > LLC_OPT_MAX_REJ_TMR_EXP) | |
1119 | goto out; | |
590232a7 | 1120 | llc->rej_sent_timer.expire = opt * HZ; |
1da177e4 LT |
1121 | break; |
1122 | case LLC_OPT_BUSY_TMR_EXP: | |
1123 | if (opt > LLC_OPT_MAX_BUSY_TMR_EXP) | |
1124 | goto out; | |
590232a7 | 1125 | llc->busy_state_timer.expire = opt * HZ; |
1da177e4 LT |
1126 | break; |
1127 | case LLC_OPT_TX_WIN: | |
1128 | if (opt > LLC_OPT_MAX_WIN) | |
1129 | goto out; | |
1130 | llc->k = opt; | |
1131 | break; | |
1132 | case LLC_OPT_RX_WIN: | |
1133 | if (opt > LLC_OPT_MAX_WIN) | |
1134 | goto out; | |
1135 | llc->rw = opt; | |
1136 | break; | |
e5cd6fe3 OP |
1137 | case LLC_OPT_PKTINFO: |
1138 | if (opt) | |
1139 | llc->cmsg_flags |= LLC_CMSG_PKTINFO; | |
1140 | else | |
1141 | llc->cmsg_flags &= ~LLC_CMSG_PKTINFO; | |
1142 | break; | |
1da177e4 LT |
1143 | default: |
1144 | rc = -ENOPROTOOPT; | |
1145 | goto out; | |
1146 | } | |
1147 | rc = 0; | |
1148 | out: | |
1149 | release_sock(sk); | |
1150 | return rc; | |
1151 | } | |
1152 | ||
1153 | /** | |
1154 | * llc_ui_getsockopt - get connection specific socket info | |
1155 | * @sock: Socket to get information from. | |
1156 | * @level: Socket level user is requesting operations on. | |
1157 | * @optname: Operation name. | |
1158 | * @optval: Variable to return operation data in. | |
1159 | * @optlen: Length of optval. | |
1160 | * | |
1161 | * Get connection specific socket information. | |
1162 | */ | |
1163 | static int llc_ui_getsockopt(struct socket *sock, int level, int optname, | |
1164 | char __user *optval, int __user *optlen) | |
1165 | { | |
1166 | struct sock *sk = sock->sk; | |
1167 | struct llc_sock *llc = llc_sk(sk); | |
1168 | int val = 0, len = 0, rc = -EINVAL; | |
1169 | ||
1170 | lock_sock(sk); | |
af426d32 | 1171 | if (unlikely(level != SOL_LLC)) |
1da177e4 LT |
1172 | goto out; |
1173 | rc = get_user(len, optlen); | |
1174 | if (rc) | |
1175 | goto out; | |
1176 | rc = -EINVAL; | |
1177 | if (len != sizeof(int)) | |
1178 | goto out; | |
1179 | switch (optname) { | |
1180 | case LLC_OPT_RETRY: | |
590232a7 | 1181 | val = llc->n2; break; |
1da177e4 | 1182 | case LLC_OPT_SIZE: |
590232a7 | 1183 | val = llc->n1; break; |
1da177e4 | 1184 | case LLC_OPT_ACK_TMR_EXP: |
590232a7 | 1185 | val = llc->ack_timer.expire / HZ; break; |
1da177e4 | 1186 | case LLC_OPT_P_TMR_EXP: |
590232a7 | 1187 | val = llc->pf_cycle_timer.expire / HZ; break; |
1da177e4 | 1188 | case LLC_OPT_REJ_TMR_EXP: |
590232a7 | 1189 | val = llc->rej_sent_timer.expire / HZ; break; |
1da177e4 | 1190 | case LLC_OPT_BUSY_TMR_EXP: |
590232a7 | 1191 | val = llc->busy_state_timer.expire / HZ; break; |
1da177e4 LT |
1192 | case LLC_OPT_TX_WIN: |
1193 | val = llc->k; break; | |
1194 | case LLC_OPT_RX_WIN: | |
1195 | val = llc->rw; break; | |
e5cd6fe3 OP |
1196 | case LLC_OPT_PKTINFO: |
1197 | val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0; | |
1198 | break; | |
1da177e4 LT |
1199 | default: |
1200 | rc = -ENOPROTOOPT; | |
1201 | goto out; | |
1202 | } | |
1203 | rc = 0; | |
1204 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) | |
1205 | rc = -EFAULT; | |
1206 | out: | |
1207 | release_sock(sk); | |
1208 | return rc; | |
1209 | } | |
1210 | ||
ec1b4cf7 | 1211 | static const struct net_proto_family llc_ui_family_ops = { |
1da177e4 LT |
1212 | .family = PF_LLC, |
1213 | .create = llc_ui_create, | |
1214 | .owner = THIS_MODULE, | |
1215 | }; | |
1216 | ||
90ddc4f0 | 1217 | static const struct proto_ops llc_ui_ops = { |
1da177e4 LT |
1218 | .family = PF_LLC, |
1219 | .owner = THIS_MODULE, | |
1220 | .release = llc_ui_release, | |
1221 | .bind = llc_ui_bind, | |
1222 | .connect = llc_ui_connect, | |
1223 | .socketpair = sock_no_socketpair, | |
1224 | .accept = llc_ui_accept, | |
1225 | .getname = llc_ui_getname, | |
a11e1d43 | 1226 | .poll = datagram_poll, |
1da177e4 LT |
1227 | .ioctl = llc_ui_ioctl, |
1228 | .listen = llc_ui_listen, | |
1229 | .shutdown = llc_ui_shutdown, | |
1230 | .setsockopt = llc_ui_setsockopt, | |
1231 | .getsockopt = llc_ui_getsockopt, | |
1232 | .sendmsg = llc_ui_sendmsg, | |
1233 | .recvmsg = llc_ui_recvmsg, | |
1234 | .mmap = sock_no_mmap, | |
1da177e4 LT |
1235 | }; |
1236 | ||
01af4a0e | 1237 | static const char llc_proc_err_msg[] __initconst = |
d57b1869 | 1238 | KERN_CRIT "LLC: Unable to register the proc_fs entries\n"; |
01af4a0e | 1239 | static const char llc_sysctl_err_msg[] __initconst = |
d57b1869 | 1240 | KERN_CRIT "LLC: Unable to register the sysctl entries\n"; |
01af4a0e | 1241 | static const char llc_sock_err_msg[] __initconst = |
d57b1869 | 1242 | KERN_CRIT "LLC: Unable to register the network family\n"; |
590232a7 | 1243 | |
1da177e4 LT |
1244 | static int __init llc2_init(void) |
1245 | { | |
1246 | int rc = proto_register(&llc_proto, 0); | |
1247 | ||
1248 | if (rc != 0) | |
1249 | goto out; | |
1250 | ||
1251 | llc_build_offset_table(); | |
1252 | llc_station_init(); | |
1253 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; | |
1254 | rc = llc_proc_init(); | |
590232a7 ACM |
1255 | if (rc != 0) { |
1256 | printk(llc_proc_err_msg); | |
f4f8720f | 1257 | goto out_station; |
590232a7 ACM |
1258 | } |
1259 | rc = llc_sysctl_init(); | |
1260 | if (rc) { | |
1261 | printk(llc_sysctl_err_msg); | |
1262 | goto out_proc; | |
1263 | } | |
1264 | rc = sock_register(&llc_ui_family_ops); | |
1265 | if (rc) { | |
1266 | printk(llc_sock_err_msg); | |
1267 | goto out_sysctl; | |
1268 | } | |
1da177e4 LT |
1269 | llc_add_pack(LLC_DEST_SAP, llc_sap_handler); |
1270 | llc_add_pack(LLC_DEST_CONN, llc_conn_handler); | |
1271 | out: | |
1272 | return rc; | |
590232a7 ACM |
1273 | out_sysctl: |
1274 | llc_sysctl_exit(); | |
1275 | out_proc: | |
1276 | llc_proc_exit(); | |
f4f8720f BH |
1277 | out_station: |
1278 | llc_station_exit(); | |
1da177e4 LT |
1279 | proto_unregister(&llc_proto); |
1280 | goto out; | |
1281 | } | |
1282 | ||
1283 | static void __exit llc2_exit(void) | |
1284 | { | |
1285 | llc_station_exit(); | |
1286 | llc_remove_pack(LLC_DEST_SAP); | |
1287 | llc_remove_pack(LLC_DEST_CONN); | |
1288 | sock_unregister(PF_LLC); | |
1289 | llc_proc_exit(); | |
590232a7 | 1290 | llc_sysctl_exit(); |
1da177e4 LT |
1291 | proto_unregister(&llc_proto); |
1292 | } | |
1293 | ||
1294 | module_init(llc2_init); | |
1295 | module_exit(llc2_exit); | |
1296 | ||
1297 | MODULE_LICENSE("GPL"); | |
1298 | MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003"); | |
1299 | MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support"); | |
1300 | MODULE_ALIAS_NETPROTO(PF_LLC); |