Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
| 23 | #include <linux/config.h> |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/rtnetlink.h> |
| 27 | #include <linux/init.h> |
| 28 | #include <net/llc.h> |
| 29 | #include <net/llc_sap.h> |
| 30 | #include <net/llc_pdu.h> |
| 31 | #include <net/llc_conn.h> |
Arnaldo Carvalho de Melo | c752f07 | 2005-08-09 20:08:28 -0700 | [diff] [blame] | 32 | #include <net/tcp_states.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | /* remember: uninitialized global data is zeroed because its in .bss */ |
| 35 | static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START; |
| 36 | static u16 llc_ui_sap_link_no_max[256]; |
| 37 | static struct sockaddr_llc llc_ui_addrnull; |
| 38 | static struct proto_ops llc_ui_ops; |
| 39 | |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 40 | static int llc_ui_wait_for_conn(struct sock *sk, long timeout); |
| 41 | static int llc_ui_wait_for_disc(struct sock *sk, long timeout); |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 42 | static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
| 44 | #if 0 |
| 45 | #define dprintk(args...) printk(KERN_DEBUG args) |
| 46 | #else |
| 47 | #define dprintk(args...) |
| 48 | #endif |
| 49 | |
| 50 | /** |
| 51 | * llc_ui_next_link_no - return the next unused link number for a sap |
| 52 | * @sap: Address of sap to get link number from. |
| 53 | * |
| 54 | * Return the next unused link number for a given sap. |
| 55 | */ |
| 56 | static __inline__ u16 llc_ui_next_link_no(int sap) |
| 57 | { |
| 58 | return llc_ui_sap_link_no_max[sap]++; |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * llc_proto_type - return eth protocol for ARP header type |
| 63 | * @arphrd: ARP header type. |
| 64 | * |
| 65 | * Given an ARP header type return the corresponding ethernet protocol. |
| 66 | */ |
| 67 | static __inline__ u16 llc_proto_type(u16 arphrd) |
| 68 | { |
| 69 | return arphrd == ARPHRD_IEEE802_TR ? |
| 70 | htons(ETH_P_TR_802_2) : htons(ETH_P_802_2); |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * llc_ui_addr_null - determines if a address structure is null |
| 75 | * @addr: Address to test if null. |
| 76 | */ |
| 77 | static __inline__ u8 llc_ui_addr_null(struct sockaddr_llc *addr) |
| 78 | { |
| 79 | return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr)); |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * llc_ui_header_len - return length of llc header based on operation |
| 84 | * @sk: Socket which contains a valid llc socket type. |
| 85 | * @addr: Complete sockaddr_llc structure received from the user. |
| 86 | * |
| 87 | * Provide the length of the llc header depending on what kind of |
| 88 | * operation the user would like to perform and the type of socket. |
| 89 | * Returns the correct llc header length. |
| 90 | */ |
| 91 | static __inline__ u8 llc_ui_header_len(struct sock *sk, |
| 92 | struct sockaddr_llc *addr) |
| 93 | { |
| 94 | u8 rc = LLC_PDU_LEN_U; |
| 95 | |
| 96 | if (addr->sllc_test || addr->sllc_xid) |
| 97 | rc = LLC_PDU_LEN_U; |
| 98 | else if (sk->sk_type == SOCK_STREAM) |
| 99 | rc = LLC_PDU_LEN_I; |
| 100 | return rc; |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * llc_ui_send_data - send data via reliable llc2 connection |
| 105 | * @sk: Connection the socket is using. |
| 106 | * @skb: Data the user wishes to send. |
| 107 | * @addr: Source and destination fields provided by the user. |
| 108 | * @noblock: can we block waiting for data? |
| 109 | * |
| 110 | * Send data via reliable llc2 connection. |
| 111 | * Returns 0 upon success, non-zero if action did not succeed. |
| 112 | */ |
| 113 | static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock) |
| 114 | { |
| 115 | struct llc_sock* llc = llc_sk(sk); |
| 116 | int rc = 0; |
| 117 | |
Arnaldo Carvalho de Melo | 249ff1c | 2005-09-22 04:32:10 -0300 | [diff] [blame] | 118 | if (unlikely(llc_data_accept_state(llc->state) || llc->p_flag)) { |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 119 | long timeout = sock_sndtimeo(sk, noblock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
| 121 | rc = llc_ui_wait_for_busy_core(sk, timeout); |
| 122 | } |
Arnaldo Carvalho de Melo | 249ff1c | 2005-09-22 04:32:10 -0300 | [diff] [blame] | 123 | if (unlikely(!rc)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | rc = llc_build_and_send_pkt(sk, skb); |
| 125 | return rc; |
| 126 | } |
| 127 | |
| 128 | static void llc_ui_sk_init(struct socket *sock, struct sock *sk) |
| 129 | { |
| 130 | sk->sk_type = sock->type; |
| 131 | sk->sk_sleep = &sock->wait; |
| 132 | sk->sk_socket = sock; |
| 133 | sock->sk = sk; |
| 134 | sock->ops = &llc_ui_ops; |
| 135 | } |
| 136 | |
| 137 | static struct proto llc_proto = { |
| 138 | .name = "DDP", |
| 139 | .owner = THIS_MODULE, |
| 140 | .obj_size = sizeof(struct llc_sock), |
| 141 | }; |
| 142 | |
| 143 | /** |
| 144 | * llc_ui_create - alloc and init a new llc_ui socket |
| 145 | * @sock: Socket to initialize and attach allocated sk to. |
| 146 | * @protocol: Unused. |
| 147 | * |
| 148 | * Allocate and initialize a new llc_ui socket, validate the user wants a |
| 149 | * socket type we have available. |
| 150 | * Returns 0 upon success, negative upon failure. |
| 151 | */ |
| 152 | static int llc_ui_create(struct socket *sock, int protocol) |
| 153 | { |
| 154 | struct sock *sk; |
| 155 | int rc = -ESOCKTNOSUPPORT; |
| 156 | |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 157 | if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | rc = -ENOMEM; |
| 159 | sk = llc_sk_alloc(PF_LLC, GFP_KERNEL, &llc_proto); |
| 160 | if (sk) { |
| 161 | rc = 0; |
| 162 | llc_ui_sk_init(sock, sk); |
| 163 | } |
| 164 | } |
| 165 | return rc; |
| 166 | } |
| 167 | |
| 168 | /** |
| 169 | * llc_ui_release - shutdown socket |
| 170 | * @sock: Socket to release. |
| 171 | * |
| 172 | * Shutdown and deallocate an existing socket. |
| 173 | */ |
| 174 | static int llc_ui_release(struct socket *sock) |
| 175 | { |
| 176 | struct sock *sk = sock->sk; |
| 177 | struct llc_sock *llc; |
| 178 | |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 179 | if (unlikely(sk == NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | goto out; |
| 181 | sock_hold(sk); |
| 182 | lock_sock(sk); |
| 183 | llc = llc_sk(sk); |
| 184 | dprintk("%s: closing local(%02X) remote(%02X)\n", __FUNCTION__, |
| 185 | llc->laddr.lsap, llc->daddr.lsap); |
| 186 | if (!llc_send_disc(sk)) |
| 187 | llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); |
| 188 | if (!sock_flag(sk, SOCK_ZAPPED)) |
| 189 | llc_sap_remove_socket(llc->sap, sk); |
| 190 | release_sock(sk); |
| 191 | if (llc->sap && hlist_empty(&llc->sap->sk_list.list)) { |
| 192 | llc_release_sockets(llc->sap); |
| 193 | llc_sap_close(llc->sap); |
| 194 | } |
| 195 | if (llc->dev) |
| 196 | dev_put(llc->dev); |
| 197 | sock_put(sk); |
| 198 | llc_sk_free(sk); |
| 199 | out: |
| 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * llc_ui_autoport - provide dynamically allocate SAP number |
| 205 | * |
| 206 | * Provide the caller with a dynamically allocated SAP number according |
| 207 | * to the rules that are set in this function. Returns: 0, upon failure, |
| 208 | * SAP number otherwise. |
| 209 | */ |
| 210 | static int llc_ui_autoport(void) |
| 211 | { |
| 212 | struct llc_sap *sap; |
| 213 | int i, tries = 0; |
| 214 | |
| 215 | while (tries < LLC_SAP_DYN_TRIES) { |
| 216 | for (i = llc_ui_sap_last_autoport; |
| 217 | i < LLC_SAP_DYN_STOP; i += 2) { |
| 218 | sap = llc_sap_find(i); |
| 219 | if (!sap) { |
| 220 | llc_ui_sap_last_autoport = i + 2; |
| 221 | goto out; |
| 222 | } |
| 223 | } |
| 224 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; |
| 225 | tries++; |
| 226 | } |
| 227 | i = 0; |
| 228 | out: |
| 229 | return i; |
| 230 | } |
| 231 | |
| 232 | /** |
Arnaldo Carvalho de Melo | 5a770c0 | 2005-09-22 03:56:26 -0300 | [diff] [blame] | 233 | * llc_ui_autobind - automatically bind a socket to a sap |
| 234 | * @sock: socket to bind |
| 235 | * @addr: address to connect to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | * |
Arnaldo Carvalho de Melo | 5a770c0 | 2005-09-22 03:56:26 -0300 | [diff] [blame] | 237 | * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't |
| 238 | * specifically used llc_ui_bind to bind to an specific address/sap |
| 239 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | * Returns: 0 upon success, negative otherwise. |
| 241 | */ |
| 242 | static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr) |
| 243 | { |
| 244 | struct sock *sk = sock->sk; |
| 245 | struct llc_sock *llc = llc_sk(sk); |
| 246 | struct llc_sap *sap; |
| 247 | int rc = -EINVAL; |
| 248 | |
| 249 | if (!sock_flag(sk, SOCK_ZAPPED)) |
| 250 | goto out; |
| 251 | rc = -ENODEV; |
| 252 | llc->dev = dev_getfirstbyhwtype(addr->sllc_arphrd); |
| 253 | if (!llc->dev) |
| 254 | goto out; |
| 255 | rc = -EUSERS; |
| 256 | llc->laddr.lsap = llc_ui_autoport(); |
| 257 | if (!llc->laddr.lsap) |
| 258 | goto out; |
| 259 | rc = -EBUSY; /* some other network layer is using the sap */ |
| 260 | sap = llc_sap_open(llc->laddr.lsap, NULL); |
| 261 | if (!sap) |
| 262 | goto out; |
| 263 | memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN); |
| 264 | memcpy(&llc->addr, addr, sizeof(llc->addr)); |
| 265 | /* assign new connection to its SAP */ |
| 266 | llc_sap_add_socket(sap, sk); |
| 267 | sock_reset_flag(sk, SOCK_ZAPPED); |
| 268 | rc = 0; |
| 269 | out: |
| 270 | return rc; |
| 271 | } |
| 272 | |
| 273 | /** |
| 274 | * llc_ui_bind - bind a socket to a specific address. |
| 275 | * @sock: Socket to bind an address to. |
| 276 | * @uaddr: Address the user wants the socket bound to. |
| 277 | * @addrlen: Length of the uaddr structure. |
| 278 | * |
| 279 | * Bind a socket to a specific address. For llc a user is able to bind to |
Arnaldo Carvalho de Melo | 5a770c0 | 2005-09-22 03:56:26 -0300 | [diff] [blame] | 280 | * a specific sap only or mac + sap. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | * If the user desires to bind to a specific mac + sap, it is possible to |
| 282 | * have multiple sap connections via multiple macs. |
| 283 | * Bind and autobind for that matter must enforce the correct sap usage |
| 284 | * otherwise all hell will break loose. |
| 285 | * Returns: 0 upon success, negative otherwise. |
| 286 | */ |
| 287 | static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen) |
| 288 | { |
| 289 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; |
| 290 | struct sock *sk = sock->sk; |
| 291 | struct llc_sock *llc = llc_sk(sk); |
| 292 | struct llc_sap *sap; |
| 293 | int rc = -EINVAL; |
| 294 | |
| 295 | dprintk("%s: binding %02X\n", __FUNCTION__, addr->sllc_sap); |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 296 | if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | goto out; |
| 298 | rc = -EAFNOSUPPORT; |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 299 | if (unlikely(addr->sllc_family != AF_LLC)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | goto out; |
| 301 | if (!addr->sllc_sap) { |
| 302 | rc = -EUSERS; |
| 303 | addr->sllc_sap = llc_ui_autoport(); |
| 304 | if (!addr->sllc_sap) |
| 305 | goto out; |
| 306 | } |
| 307 | sap = llc_sap_find(addr->sllc_sap); |
| 308 | if (!sap) { |
| 309 | sap = llc_sap_open(addr->sllc_sap, NULL); |
| 310 | rc = -EBUSY; /* some other network layer is using the sap */ |
| 311 | if (!sap) |
| 312 | goto out; |
| 313 | } else { |
| 314 | struct llc_addr laddr, daddr; |
| 315 | struct sock *ask; |
| 316 | |
| 317 | memset(&laddr, 0, sizeof(laddr)); |
| 318 | memset(&daddr, 0, sizeof(daddr)); |
| 319 | /* |
| 320 | * FIXME: check if the the address is multicast, |
| 321 | * only SOCK_DGRAM can do this. |
| 322 | */ |
| 323 | memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN); |
| 324 | laddr.lsap = addr->sllc_sap; |
| 325 | rc = -EADDRINUSE; /* mac + sap clash. */ |
| 326 | ask = llc_lookup_established(sap, &daddr, &laddr); |
| 327 | if (ask) { |
| 328 | sock_put(ask); |
| 329 | goto out; |
| 330 | } |
| 331 | } |
| 332 | llc->laddr.lsap = addr->sllc_sap; |
| 333 | memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN); |
| 334 | memcpy(&llc->addr, addr, sizeof(llc->addr)); |
| 335 | /* assign new connection to its SAP */ |
| 336 | llc_sap_add_socket(sap, sk); |
| 337 | sock_reset_flag(sk, SOCK_ZAPPED); |
| 338 | rc = 0; |
| 339 | out: |
| 340 | return rc; |
| 341 | } |
| 342 | |
| 343 | /** |
| 344 | * llc_ui_shutdown - shutdown a connect llc2 socket. |
| 345 | * @sock: Socket to shutdown. |
| 346 | * @how: What part of the socket to shutdown. |
| 347 | * |
| 348 | * Shutdown a connected llc2 socket. Currently this function only supports |
| 349 | * shutting down both sends and receives (2), we could probably make this |
| 350 | * function such that a user can shutdown only half the connection but not |
| 351 | * right now. |
| 352 | * Returns: 0 upon success, negative otherwise. |
| 353 | */ |
| 354 | static int llc_ui_shutdown(struct socket *sock, int how) |
| 355 | { |
| 356 | struct sock *sk = sock->sk; |
| 357 | int rc = -ENOTCONN; |
| 358 | |
| 359 | lock_sock(sk); |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 360 | if (unlikely(sk->sk_state != TCP_ESTABLISHED)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | goto out; |
| 362 | rc = -EINVAL; |
| 363 | if (how != 2) |
| 364 | goto out; |
| 365 | rc = llc_send_disc(sk); |
| 366 | if (!rc) |
| 367 | rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo); |
| 368 | /* Wake up anyone sleeping in poll */ |
| 369 | sk->sk_state_change(sk); |
| 370 | out: |
| 371 | release_sock(sk); |
| 372 | return rc; |
| 373 | } |
| 374 | |
| 375 | /** |
| 376 | * llc_ui_connect - Connect to a remote llc2 mac + sap. |
| 377 | * @sock: Socket which will be connected to the remote destination. |
| 378 | * @uaddr: Remote and possibly the local address of the new connection. |
| 379 | * @addrlen: Size of uaddr structure. |
| 380 | * @flags: Operational flags specified by the user. |
| 381 | * |
| 382 | * Connect to a remote llc2 mac + sap. The caller must specify the |
| 383 | * destination mac and address to connect to. If the user hasn't previously |
| 384 | * called bind(2) with a smac the address of the first interface of the |
| 385 | * specified arp type will be used. |
| 386 | * This function will autobind if user did not previously call bind. |
| 387 | * Returns: 0 upon success, negative otherwise. |
| 388 | */ |
| 389 | static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr, |
| 390 | int addrlen, int flags) |
| 391 | { |
| 392 | struct sock *sk = sock->sk; |
| 393 | struct llc_sock *llc = llc_sk(sk); |
| 394 | struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | int rc = -EINVAL; |
| 396 | |
| 397 | lock_sock(sk); |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 398 | if (unlikely(addrlen != sizeof(*addr))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | goto out; |
| 400 | rc = -EAFNOSUPPORT; |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 401 | if (unlikely(addr->sllc_family != AF_LLC)) |
| 402 | goto out; |
| 403 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
| 404 | goto out; |
| 405 | rc = -EALREADY; |
| 406 | if (unlikely(sock->state == SS_CONNECTING)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | goto out; |
| 408 | /* bind connection to sap if user hasn't done it. */ |
| 409 | if (sock_flag(sk, SOCK_ZAPPED)) { |
| 410 | /* bind to sap with null dev, exclusive */ |
| 411 | rc = llc_ui_autobind(sock, addr); |
| 412 | if (rc) |
| 413 | goto out; |
| 414 | llc->daddr.lsap = addr->sllc_sap; |
| 415 | memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN); |
| 416 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | sock->state = SS_CONNECTING; |
| 418 | sk->sk_state = TCP_SYN_SENT; |
| 419 | llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap); |
Arnaldo Carvalho de Melo | 774ccb4 | 2005-09-22 03:53:35 -0300 | [diff] [blame] | 420 | rc = llc_establish_connection(sk, llc->dev->dev_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | addr->sllc_mac, addr->sllc_sap); |
| 422 | if (rc) { |
| 423 | dprintk("%s: llc_ui_send_conn failed :-(\n", __FUNCTION__); |
| 424 | sock->state = SS_UNCONNECTED; |
| 425 | sk->sk_state = TCP_CLOSE; |
| 426 | goto out; |
| 427 | } |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 428 | |
| 429 | if (sk->sk_state == TCP_SYN_SENT) { |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 430 | const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 431 | |
| 432 | if (!timeo || !llc_ui_wait_for_conn(sk, timeo)) |
| 433 | goto out; |
| 434 | |
| 435 | rc = sock_intr_errno(timeo); |
| 436 | if (signal_pending(current)) |
| 437 | goto out; |
| 438 | } |
| 439 | |
| 440 | if (sk->sk_state == TCP_CLOSE) |
| 441 | goto sock_error; |
| 442 | |
| 443 | sock->state = SS_CONNECTED; |
| 444 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | out: |
| 446 | release_sock(sk); |
| 447 | return rc; |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 448 | sock_error: |
| 449 | rc = sock_error(sk) ? : -ECONNABORTED; |
| 450 | sock->state = SS_UNCONNECTED; |
| 451 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | } |
| 453 | |
| 454 | /** |
| 455 | * llc_ui_listen - allow a normal socket to accept incoming connections |
| 456 | * @sock: Socket to allow incoming connections on. |
| 457 | * @backlog: Number of connections to queue. |
| 458 | * |
| 459 | * Allow a normal socket to accept incoming connections. |
| 460 | * Returns 0 upon success, negative otherwise. |
| 461 | */ |
| 462 | static int llc_ui_listen(struct socket *sock, int backlog) |
| 463 | { |
| 464 | struct sock *sk = sock->sk; |
| 465 | int rc = -EINVAL; |
| 466 | |
| 467 | lock_sock(sk); |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 468 | if (unlikely(sock->state != SS_UNCONNECTED)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | goto out; |
| 470 | rc = -EOPNOTSUPP; |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 471 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | goto out; |
| 473 | rc = -EAGAIN; |
| 474 | if (sock_flag(sk, SOCK_ZAPPED)) |
| 475 | goto out; |
| 476 | rc = 0; |
| 477 | if (!(unsigned)backlog) /* BSDism */ |
| 478 | backlog = 1; |
| 479 | sk->sk_max_ack_backlog = backlog; |
| 480 | if (sk->sk_state != TCP_LISTEN) { |
| 481 | sk->sk_ack_backlog = 0; |
| 482 | sk->sk_state = TCP_LISTEN; |
| 483 | } |
| 484 | sk->sk_socket->flags |= __SO_ACCEPTCON; |
| 485 | out: |
| 486 | release_sock(sk); |
| 487 | return rc; |
| 488 | } |
| 489 | |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 490 | static int llc_ui_wait_for_disc(struct sock *sk, long timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | { |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 492 | DEFINE_WAIT(wait); |
| 493 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 495 | while (1) { |
| 496 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
| 497 | if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE)) |
| 498 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | rc = -ERESTARTSYS; |
| 500 | if (signal_pending(current)) |
| 501 | break; |
| 502 | rc = -EAGAIN; |
| 503 | if (!timeout) |
| 504 | break; |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 505 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | } |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 507 | finish_wait(sk->sk_sleep, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | return rc; |
| 509 | } |
| 510 | |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 511 | static int llc_ui_wait_for_conn(struct sock *sk, long timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | { |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 513 | DEFINE_WAIT(wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 515 | while (1) { |
| 516 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
| 517 | if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT)) |
| 518 | break; |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 519 | if (signal_pending(current) || !timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | } |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 522 | finish_wait(sk->sk_sleep, &wait); |
| 523 | return timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | } |
| 525 | |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 526 | static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | { |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 528 | DEFINE_WAIT(wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | struct llc_sock *llc = llc_sk(sk); |
| 530 | int rc; |
| 531 | |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 532 | while (1) { |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 533 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | rc = 0; |
Arnaldo Carvalho de Melo | 54fb7f2 | 2005-09-22 04:26:14 -0300 | [diff] [blame] | 535 | if (sk_wait_event(sk, &timeout, |
| 536 | (sk->sk_shutdown & RCV_SHUTDOWN) || |
| 537 | (!llc_data_accept_state(llc->state) && |
| 538 | !llc->p_flag))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | break; |
| 540 | rc = -ERESTARTSYS; |
| 541 | if (signal_pending(current)) |
| 542 | break; |
| 543 | rc = -EAGAIN; |
| 544 | if (!timeout) |
| 545 | break; |
| 546 | } |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 547 | finish_wait(sk->sk_sleep, &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | return rc; |
| 549 | } |
| 550 | |
Arnaldo Carvalho de Melo | afdbe35 | 2005-09-22 04:37:07 -0300 | [diff] [blame^] | 551 | int llc_wait_data(struct sock *sk, long timeo) |
| 552 | { |
| 553 | int rc; |
| 554 | |
| 555 | while (1) { |
| 556 | /* |
| 557 | * POSIX 1003.1g mandates this order. |
| 558 | */ |
| 559 | if (sk->sk_err) { |
| 560 | rc = sock_error(sk); |
| 561 | break; |
| 562 | } |
| 563 | rc = 0; |
| 564 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
| 565 | break; |
| 566 | rc = -EAGAIN; |
| 567 | if (!timeo) |
| 568 | break; |
| 569 | rc = sock_intr_errno(timeo); |
| 570 | if (signal_pending(current)) |
| 571 | break; |
| 572 | rc = 0; |
| 573 | if (sk_wait_data(sk, &timeo)) |
| 574 | break; |
| 575 | } |
| 576 | return rc; |
| 577 | } |
| 578 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | /** |
| 580 | * llc_ui_accept - accept a new incoming connection. |
| 581 | * @sock: Socket which connections arrive on. |
| 582 | * @newsock: Socket to move incoming connection to. |
| 583 | * @flags: User specified operational flags. |
| 584 | * |
| 585 | * Accept a new incoming connection. |
| 586 | * Returns 0 upon success, negative otherwise. |
| 587 | */ |
| 588 | static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags) |
| 589 | { |
| 590 | struct sock *sk = sock->sk, *newsk; |
| 591 | struct llc_sock *llc, *newllc; |
| 592 | struct sk_buff *skb; |
| 593 | int rc = -EOPNOTSUPP; |
| 594 | |
| 595 | dprintk("%s: accepting on %02X\n", __FUNCTION__, |
| 596 | llc_sk(sk)->laddr.lsap); |
| 597 | lock_sock(sk); |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 598 | if (unlikely(sk->sk_type != SOCK_STREAM)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | goto out; |
| 600 | rc = -EINVAL; |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 601 | if (unlikely(sock->state != SS_UNCONNECTED || |
| 602 | sk->sk_state != TCP_LISTEN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | goto out; |
| 604 | /* wait for a connection to arrive. */ |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 605 | if (skb_queue_empty(&sk->sk_receive_queue)) { |
Arnaldo Carvalho de Melo | afdbe35 | 2005-09-22 04:37:07 -0300 | [diff] [blame^] | 606 | rc = llc_wait_data(sk, sk->sk_rcvtimeo); |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 607 | if (rc) |
| 608 | goto out; |
| 609 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | dprintk("%s: got a new connection on %02X\n", __FUNCTION__, |
| 611 | llc_sk(sk)->laddr.lsap); |
| 612 | skb = skb_dequeue(&sk->sk_receive_queue); |
| 613 | rc = -EINVAL; |
| 614 | if (!skb->sk) |
| 615 | goto frees; |
| 616 | rc = 0; |
| 617 | newsk = skb->sk; |
| 618 | /* attach connection to a new socket. */ |
| 619 | llc_ui_sk_init(newsock, newsk); |
| 620 | sock_reset_flag(newsk, SOCK_ZAPPED); |
| 621 | newsk->sk_state = TCP_ESTABLISHED; |
| 622 | newsock->state = SS_CONNECTED; |
| 623 | llc = llc_sk(sk); |
| 624 | newllc = llc_sk(newsk); |
| 625 | memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr)); |
| 626 | newllc->link = llc_ui_next_link_no(newllc->laddr.lsap); |
| 627 | |
| 628 | /* put original socket back into a clean listen state. */ |
| 629 | sk->sk_state = TCP_LISTEN; |
| 630 | sk->sk_ack_backlog--; |
| 631 | skb->sk = NULL; |
| 632 | dprintk("%s: ok success on %02X, client on %02X\n", __FUNCTION__, |
| 633 | llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap); |
| 634 | frees: |
| 635 | kfree_skb(skb); |
| 636 | out: |
| 637 | release_sock(sk); |
| 638 | return rc; |
| 639 | } |
| 640 | |
| 641 | /** |
| 642 | * llc_ui_recvmsg - copy received data to the socket user. |
| 643 | * @sock: Socket to copy data from. |
| 644 | * @msg: Various user space related information. |
| 645 | * @size: Size of user buffer. |
| 646 | * @flags: User specified flags. |
| 647 | * |
| 648 | * Copy received data to the socket user. |
| 649 | * Returns non-negative upon success, negative otherwise. |
| 650 | */ |
| 651 | static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 652 | struct msghdr *msg, size_t size, int flags) |
| 653 | { |
| 654 | struct sock *sk = sock->sk; |
| 655 | struct sockaddr_llc *uaddr = (struct sockaddr_llc *)msg->msg_name; |
| 656 | struct sk_buff *skb; |
| 657 | size_t copied = 0; |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 658 | int rc = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | int noblock = flags & MSG_DONTWAIT; |
| 660 | |
| 661 | dprintk("%s: receiving in %02X from %02X\n", __FUNCTION__, |
| 662 | llc_sk(sk)->laddr.lsap, llc_sk(sk)->daddr.lsap); |
| 663 | lock_sock(sk); |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 664 | if (skb_queue_empty(&sk->sk_receive_queue)) { |
Arnaldo Carvalho de Melo | afdbe35 | 2005-09-22 04:37:07 -0300 | [diff] [blame^] | 665 | rc = llc_wait_data(sk, sock_rcvtimeo(sk, noblock)); |
Arnaldo Carvalho de Melo | b35bd11 | 2005-09-22 04:22:39 -0300 | [diff] [blame] | 666 | if (rc) |
| 667 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | } |
| 669 | skb = skb_dequeue(&sk->sk_receive_queue); |
| 670 | if (!skb) /* shutdown */ |
| 671 | goto out; |
| 672 | copied = skb->len; |
| 673 | if (copied > size) |
| 674 | copied = size; |
| 675 | rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
| 676 | if (rc) |
| 677 | goto dgram_free; |
| 678 | if (skb->len > copied) { |
| 679 | skb_pull(skb, copied); |
| 680 | skb_queue_head(&sk->sk_receive_queue, skb); |
| 681 | } |
| 682 | if (uaddr) |
| 683 | memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr)); |
| 684 | msg->msg_namelen = sizeof(*uaddr); |
David S. Miller | 8728b83 | 2005-08-09 19:25:21 -0700 | [diff] [blame] | 685 | if (!skb->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | dgram_free: |
| 687 | kfree_skb(skb); |
| 688 | } |
| 689 | out: |
| 690 | release_sock(sk); |
| 691 | return rc ? : copied; |
| 692 | } |
| 693 | |
| 694 | /** |
| 695 | * llc_ui_sendmsg - Transmit data provided by the socket user. |
| 696 | * @sock: Socket to transmit data from. |
| 697 | * @msg: Various user related information. |
| 698 | * @len: Length of data to transmit. |
| 699 | * |
| 700 | * Transmit data provided by the socket user. |
| 701 | * Returns non-negative upon success, negative otherwise. |
| 702 | */ |
| 703 | static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock, |
| 704 | struct msghdr *msg, size_t len) |
| 705 | { |
| 706 | struct sock *sk = sock->sk; |
| 707 | struct llc_sock *llc = llc_sk(sk); |
| 708 | struct sockaddr_llc *addr = (struct sockaddr_llc *)msg->msg_name; |
| 709 | int flags = msg->msg_flags; |
| 710 | int noblock = flags & MSG_DONTWAIT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | struct sk_buff *skb; |
| 712 | size_t size = 0; |
| 713 | int rc = -EINVAL, copied = 0, hdrlen; |
| 714 | |
| 715 | dprintk("%s: sending from %02X to %02X\n", __FUNCTION__, |
| 716 | llc->laddr.lsap, llc->daddr.lsap); |
| 717 | lock_sock(sk); |
| 718 | if (addr) { |
| 719 | if (msg->msg_namelen < sizeof(*addr)) |
| 720 | goto release; |
| 721 | } else { |
| 722 | if (llc_ui_addr_null(&llc->addr)) |
| 723 | goto release; |
| 724 | addr = &llc->addr; |
| 725 | } |
| 726 | /* must bind connection to sap if user hasn't done it. */ |
| 727 | if (sock_flag(sk, SOCK_ZAPPED)) { |
| 728 | /* bind to sap with null dev, exclusive. */ |
| 729 | rc = llc_ui_autobind(sock, addr); |
| 730 | if (rc) |
| 731 | goto release; |
| 732 | } |
Arnaldo Carvalho de Melo | 774ccb4 | 2005-09-22 03:53:35 -0300 | [diff] [blame] | 733 | hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | size = hdrlen + len; |
Arnaldo Carvalho de Melo | 774ccb4 | 2005-09-22 03:53:35 -0300 | [diff] [blame] | 735 | if (size > llc->dev->mtu) |
| 736 | size = llc->dev->mtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | copied = size - hdrlen; |
| 738 | release_sock(sk); |
| 739 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); |
| 740 | lock_sock(sk); |
| 741 | if (!skb) |
| 742 | goto release; |
| 743 | skb->sk = sk; |
Arnaldo Carvalho de Melo | 774ccb4 | 2005-09-22 03:53:35 -0300 | [diff] [blame] | 744 | skb->dev = llc->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | skb->protocol = llc_proto_type(addr->sllc_arphrd); |
| 746 | skb_reserve(skb, hdrlen); |
| 747 | rc = memcpy_fromiovec(skb_put(skb, copied), msg->msg_iov, copied); |
| 748 | if (rc) |
| 749 | goto out; |
| 750 | if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) { |
| 751 | llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac, |
| 752 | addr->sllc_sap); |
| 753 | goto out; |
| 754 | } |
| 755 | if (addr->sllc_test) { |
| 756 | llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac, |
| 757 | addr->sllc_sap); |
| 758 | goto out; |
| 759 | } |
| 760 | if (addr->sllc_xid) { |
| 761 | llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac, |
| 762 | addr->sllc_sap); |
| 763 | goto out; |
| 764 | } |
| 765 | rc = -ENOPROTOOPT; |
| 766 | if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua)) |
| 767 | goto out; |
| 768 | rc = llc_ui_send_data(sk, skb, noblock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | out: |
Arnaldo Carvalho de Melo | 249ff1c | 2005-09-22 04:32:10 -0300 | [diff] [blame] | 770 | if (rc) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | kfree_skb(skb); |
| 772 | release: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | dprintk("%s: failed sending from %02X to %02X: %d\n", |
| 774 | __FUNCTION__, llc->laddr.lsap, llc->daddr.lsap, rc); |
Arnaldo Carvalho de Melo | 249ff1c | 2005-09-22 04:32:10 -0300 | [diff] [blame] | 775 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | release_sock(sk); |
| 777 | return rc ? : copied; |
| 778 | } |
| 779 | |
| 780 | /** |
| 781 | * llc_ui_getname - return the address info of a socket |
| 782 | * @sock: Socket to get address of. |
| 783 | * @uaddr: Address structure to return information. |
| 784 | * @uaddrlen: Length of address structure. |
| 785 | * @peer: Does user want local or remote address information. |
| 786 | * |
| 787 | * Return the address information of a socket. |
| 788 | */ |
| 789 | static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr, |
| 790 | int *uaddrlen, int peer) |
| 791 | { |
| 792 | struct sockaddr_llc sllc; |
| 793 | struct sock *sk = sock->sk; |
| 794 | struct llc_sock *llc = llc_sk(sk); |
| 795 | int rc = 0; |
| 796 | |
| 797 | lock_sock(sk); |
| 798 | if (sock_flag(sk, SOCK_ZAPPED)) |
| 799 | goto out; |
| 800 | *uaddrlen = sizeof(sllc); |
| 801 | memset(uaddr, 0, *uaddrlen); |
| 802 | if (peer) { |
| 803 | rc = -ENOTCONN; |
| 804 | if (sk->sk_state != TCP_ESTABLISHED) |
| 805 | goto out; |
| 806 | if(llc->dev) |
| 807 | sllc.sllc_arphrd = llc->dev->type; |
| 808 | sllc.sllc_sap = llc->daddr.lsap; |
| 809 | memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN); |
| 810 | } else { |
| 811 | rc = -EINVAL; |
| 812 | if (!llc->sap) |
| 813 | goto out; |
| 814 | sllc.sllc_sap = llc->sap->laddr.lsap; |
| 815 | |
| 816 | if (llc->dev) { |
| 817 | sllc.sllc_arphrd = llc->dev->type; |
| 818 | memcpy(&sllc.sllc_mac, &llc->dev->dev_addr, |
| 819 | IFHWADDRLEN); |
| 820 | } |
| 821 | } |
| 822 | rc = 0; |
| 823 | sllc.sllc_family = AF_LLC; |
| 824 | memcpy(uaddr, &sllc, sizeof(sllc)); |
| 825 | out: |
| 826 | release_sock(sk); |
| 827 | return rc; |
| 828 | } |
| 829 | |
| 830 | /** |
| 831 | * llc_ui_ioctl - io controls for PF_LLC |
| 832 | * @sock: Socket to get/set info |
| 833 | * @cmd: command |
| 834 | * @arg: optional argument for cmd |
| 835 | * |
| 836 | * get/set info on llc sockets |
| 837 | */ |
| 838 | static int llc_ui_ioctl(struct socket *sock, unsigned int cmd, |
| 839 | unsigned long arg) |
| 840 | { |
| 841 | return dev_ioctl(cmd, (void __user *)arg); |
| 842 | } |
| 843 | |
| 844 | /** |
| 845 | * llc_ui_setsockopt - set various connection specific parameters. |
| 846 | * @sock: Socket to set options on. |
| 847 | * @level: Socket level user is requesting operations on. |
| 848 | * @optname: Operation name. |
| 849 | * @optval User provided operation data. |
| 850 | * @optlen: Length of optval. |
| 851 | * |
| 852 | * Set various connection specific parameters. |
| 853 | */ |
| 854 | static int llc_ui_setsockopt(struct socket *sock, int level, int optname, |
| 855 | char __user *optval, int optlen) |
| 856 | { |
| 857 | struct sock *sk = sock->sk; |
| 858 | struct llc_sock *llc = llc_sk(sk); |
| 859 | int rc = -EINVAL, opt; |
| 860 | |
| 861 | lock_sock(sk); |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 862 | if (unlikely(level != SOL_LLC || optlen != sizeof(int))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | goto out; |
| 864 | rc = get_user(opt, (int __user *)optval); |
| 865 | if (rc) |
| 866 | goto out; |
| 867 | rc = -EINVAL; |
| 868 | switch (optname) { |
| 869 | case LLC_OPT_RETRY: |
| 870 | if (opt > LLC_OPT_MAX_RETRY) |
| 871 | goto out; |
| 872 | llc->n2 = opt; |
| 873 | break; |
| 874 | case LLC_OPT_SIZE: |
| 875 | if (opt > LLC_OPT_MAX_SIZE) |
| 876 | goto out; |
| 877 | llc->n1 = opt; |
| 878 | break; |
| 879 | case LLC_OPT_ACK_TMR_EXP: |
| 880 | if (opt > LLC_OPT_MAX_ACK_TMR_EXP) |
| 881 | goto out; |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 882 | llc->ack_timer.expire = opt * HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | break; |
| 884 | case LLC_OPT_P_TMR_EXP: |
| 885 | if (opt > LLC_OPT_MAX_P_TMR_EXP) |
| 886 | goto out; |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 887 | llc->pf_cycle_timer.expire = opt * HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | break; |
| 889 | case LLC_OPT_REJ_TMR_EXP: |
| 890 | if (opt > LLC_OPT_MAX_REJ_TMR_EXP) |
| 891 | goto out; |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 892 | llc->rej_sent_timer.expire = opt * HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | break; |
| 894 | case LLC_OPT_BUSY_TMR_EXP: |
| 895 | if (opt > LLC_OPT_MAX_BUSY_TMR_EXP) |
| 896 | goto out; |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 897 | llc->busy_state_timer.expire = opt * HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | break; |
| 899 | case LLC_OPT_TX_WIN: |
| 900 | if (opt > LLC_OPT_MAX_WIN) |
| 901 | goto out; |
| 902 | llc->k = opt; |
| 903 | break; |
| 904 | case LLC_OPT_RX_WIN: |
| 905 | if (opt > LLC_OPT_MAX_WIN) |
| 906 | goto out; |
| 907 | llc->rw = opt; |
| 908 | break; |
| 909 | default: |
| 910 | rc = -ENOPROTOOPT; |
| 911 | goto out; |
| 912 | } |
| 913 | rc = 0; |
| 914 | out: |
| 915 | release_sock(sk); |
| 916 | return rc; |
| 917 | } |
| 918 | |
| 919 | /** |
| 920 | * llc_ui_getsockopt - get connection specific socket info |
| 921 | * @sock: Socket to get information from. |
| 922 | * @level: Socket level user is requesting operations on. |
| 923 | * @optname: Operation name. |
| 924 | * @optval: Variable to return operation data in. |
| 925 | * @optlen: Length of optval. |
| 926 | * |
| 927 | * Get connection specific socket information. |
| 928 | */ |
| 929 | static int llc_ui_getsockopt(struct socket *sock, int level, int optname, |
| 930 | char __user *optval, int __user *optlen) |
| 931 | { |
| 932 | struct sock *sk = sock->sk; |
| 933 | struct llc_sock *llc = llc_sk(sk); |
| 934 | int val = 0, len = 0, rc = -EINVAL; |
| 935 | |
| 936 | lock_sock(sk); |
Arnaldo Carvalho de Melo | af426d3 | 2005-09-22 03:59:22 -0300 | [diff] [blame] | 937 | if (unlikely(level != SOL_LLC)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | goto out; |
| 939 | rc = get_user(len, optlen); |
| 940 | if (rc) |
| 941 | goto out; |
| 942 | rc = -EINVAL; |
| 943 | if (len != sizeof(int)) |
| 944 | goto out; |
| 945 | switch (optname) { |
| 946 | case LLC_OPT_RETRY: |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 947 | val = llc->n2; break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | case LLC_OPT_SIZE: |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 949 | val = llc->n1; break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | case LLC_OPT_ACK_TMR_EXP: |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 951 | val = llc->ack_timer.expire / HZ; break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | case LLC_OPT_P_TMR_EXP: |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 953 | val = llc->pf_cycle_timer.expire / HZ; break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | case LLC_OPT_REJ_TMR_EXP: |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 955 | val = llc->rej_sent_timer.expire / HZ; break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | case LLC_OPT_BUSY_TMR_EXP: |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 957 | val = llc->busy_state_timer.expire / HZ; break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | case LLC_OPT_TX_WIN: |
| 959 | val = llc->k; break; |
| 960 | case LLC_OPT_RX_WIN: |
| 961 | val = llc->rw; break; |
| 962 | default: |
| 963 | rc = -ENOPROTOOPT; |
| 964 | goto out; |
| 965 | } |
| 966 | rc = 0; |
| 967 | if (put_user(len, optlen) || copy_to_user(optval, &val, len)) |
| 968 | rc = -EFAULT; |
| 969 | out: |
| 970 | release_sock(sk); |
| 971 | return rc; |
| 972 | } |
| 973 | |
| 974 | static struct net_proto_family llc_ui_family_ops = { |
| 975 | .family = PF_LLC, |
| 976 | .create = llc_ui_create, |
| 977 | .owner = THIS_MODULE, |
| 978 | }; |
| 979 | |
| 980 | static struct proto_ops llc_ui_ops = { |
| 981 | .family = PF_LLC, |
| 982 | .owner = THIS_MODULE, |
| 983 | .release = llc_ui_release, |
| 984 | .bind = llc_ui_bind, |
| 985 | .connect = llc_ui_connect, |
| 986 | .socketpair = sock_no_socketpair, |
| 987 | .accept = llc_ui_accept, |
| 988 | .getname = llc_ui_getname, |
| 989 | .poll = datagram_poll, |
| 990 | .ioctl = llc_ui_ioctl, |
| 991 | .listen = llc_ui_listen, |
| 992 | .shutdown = llc_ui_shutdown, |
| 993 | .setsockopt = llc_ui_setsockopt, |
| 994 | .getsockopt = llc_ui_getsockopt, |
| 995 | .sendmsg = llc_ui_sendmsg, |
| 996 | .recvmsg = llc_ui_recvmsg, |
| 997 | .mmap = sock_no_mmap, |
| 998 | .sendpage = sock_no_sendpage, |
| 999 | }; |
| 1000 | |
| 1001 | extern void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb); |
| 1002 | extern void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb); |
| 1003 | |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1004 | static char llc_proc_err_msg[] __initdata = |
| 1005 | KERN_CRIT "LLC: Unable to register the proc_fs entries\n"; |
| 1006 | static char llc_sysctl_err_msg[] __initdata = |
| 1007 | KERN_CRIT "LLC: Unable to register the sysctl entries\n"; |
| 1008 | static char llc_sock_err_msg[] __initdata = |
| 1009 | KERN_CRIT "LLC: Unable to register the network family\n"; |
| 1010 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | static int __init llc2_init(void) |
| 1012 | { |
| 1013 | int rc = proto_register(&llc_proto, 0); |
| 1014 | |
| 1015 | if (rc != 0) |
| 1016 | goto out; |
| 1017 | |
| 1018 | llc_build_offset_table(); |
| 1019 | llc_station_init(); |
| 1020 | llc_ui_sap_last_autoport = LLC_SAP_DYN_START; |
| 1021 | rc = llc_proc_init(); |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1022 | if (rc != 0) { |
| 1023 | printk(llc_proc_err_msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | goto out_unregister_llc_proto; |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1025 | } |
| 1026 | rc = llc_sysctl_init(); |
| 1027 | if (rc) { |
| 1028 | printk(llc_sysctl_err_msg); |
| 1029 | goto out_proc; |
| 1030 | } |
| 1031 | rc = sock_register(&llc_ui_family_ops); |
| 1032 | if (rc) { |
| 1033 | printk(llc_sock_err_msg); |
| 1034 | goto out_sysctl; |
| 1035 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | llc_add_pack(LLC_DEST_SAP, llc_sap_handler); |
| 1037 | llc_add_pack(LLC_DEST_CONN, llc_conn_handler); |
| 1038 | out: |
| 1039 | return rc; |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1040 | out_sysctl: |
| 1041 | llc_sysctl_exit(); |
| 1042 | out_proc: |
| 1043 | llc_proc_exit(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | out_unregister_llc_proto: |
| 1045 | proto_unregister(&llc_proto); |
| 1046 | goto out; |
| 1047 | } |
| 1048 | |
| 1049 | static void __exit llc2_exit(void) |
| 1050 | { |
| 1051 | llc_station_exit(); |
| 1052 | llc_remove_pack(LLC_DEST_SAP); |
| 1053 | llc_remove_pack(LLC_DEST_CONN); |
| 1054 | sock_unregister(PF_LLC); |
| 1055 | llc_proc_exit(); |
Arnaldo Carvalho de Melo | 590232a | 2005-09-22 04:30:44 -0300 | [diff] [blame] | 1056 | llc_sysctl_exit(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | proto_unregister(&llc_proto); |
| 1058 | } |
| 1059 | |
| 1060 | module_init(llc2_init); |
| 1061 | module_exit(llc2_exit); |
| 1062 | |
| 1063 | MODULE_LICENSE("GPL"); |
| 1064 | MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003"); |
| 1065 | MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support"); |
| 1066 | MODULE_ALIAS_NETPROTO(PF_LLC); |