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