| 1 | /* net/atm/svc.c - ATM SVC sockets */ |
| 2 | |
| 3 | /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ |
| 4 | |
| 5 | |
| 6 | #include <linux/string.h> |
| 7 | #include <linux/net.h> /* struct socket, struct proto_ops */ |
| 8 | #include <linux/errno.h> /* error codes */ |
| 9 | #include <linux/kernel.h> /* printk */ |
| 10 | #include <linux/skbuff.h> |
| 11 | #include <linux/wait.h> |
| 12 | #include <linux/sched.h> /* jiffies and HZ */ |
| 13 | #include <linux/fcntl.h> /* O_NONBLOCK */ |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/atm.h> /* ATM stuff */ |
| 16 | #include <linux/atmsap.h> |
| 17 | #include <linux/atmsvc.h> |
| 18 | #include <linux/atmdev.h> |
| 19 | #include <linux/bitops.h> |
| 20 | #include <net/sock.h> /* for sock_no_* */ |
| 21 | #include <asm/uaccess.h> |
| 22 | |
| 23 | #include "resources.h" |
| 24 | #include "common.h" /* common for PVCs and SVCs */ |
| 25 | #include "signaling.h" |
| 26 | #include "addr.h" |
| 27 | |
| 28 | static int svc_create(struct net *net, struct socket *sock,int protocol); |
| 29 | |
| 30 | /* |
| 31 | * Note: since all this is still nicely synchronized with the signaling demon, |
| 32 | * there's no need to protect sleep loops with clis. If signaling is |
| 33 | * moved into the kernel, that would change. |
| 34 | */ |
| 35 | |
| 36 | |
| 37 | static int svc_shutdown(struct socket *sock,int how) |
| 38 | { |
| 39 | return 0; |
| 40 | } |
| 41 | |
| 42 | |
| 43 | static void svc_disconnect(struct atm_vcc *vcc) |
| 44 | { |
| 45 | DEFINE_WAIT(wait); |
| 46 | struct sk_buff *skb; |
| 47 | struct sock *sk = sk_atm(vcc); |
| 48 | |
| 49 | pr_debug("svc_disconnect %p\n",vcc); |
| 50 | if (test_bit(ATM_VF_REGIS,&vcc->flags)) { |
| 51 | prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); |
| 52 | sigd_enq(vcc,as_close,NULL,NULL,NULL); |
| 53 | while (!test_bit(ATM_VF_RELEASED,&vcc->flags) && sigd) { |
| 54 | schedule(); |
| 55 | prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); |
| 56 | } |
| 57 | finish_wait(sk->sk_sleep, &wait); |
| 58 | } |
| 59 | /* beware - socket is still in use by atmsigd until the last |
| 60 | as_indicate has been answered */ |
| 61 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
| 62 | atm_return(vcc, skb->truesize); |
| 63 | pr_debug("LISTEN REL\n"); |
| 64 | sigd_enq2(NULL,as_reject,vcc,NULL,NULL,&vcc->qos,0); |
| 65 | dev_kfree_skb(skb); |
| 66 | } |
| 67 | clear_bit(ATM_VF_REGIS, &vcc->flags); |
| 68 | /* ... may retry later */ |
| 69 | } |
| 70 | |
| 71 | |
| 72 | static int svc_release(struct socket *sock) |
| 73 | { |
| 74 | struct sock *sk = sock->sk; |
| 75 | struct atm_vcc *vcc; |
| 76 | |
| 77 | if (sk) { |
| 78 | vcc = ATM_SD(sock); |
| 79 | pr_debug("svc_release %p\n", vcc); |
| 80 | clear_bit(ATM_VF_READY, &vcc->flags); |
| 81 | /* VCC pointer is used as a reference, so we must not free it |
| 82 | (thereby subjecting it to re-use) before all pending connections |
| 83 | are closed */ |
| 84 | svc_disconnect(vcc); |
| 85 | vcc_release(sock); |
| 86 | } |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | |
| 91 | static int svc_bind(struct socket *sock,struct sockaddr *sockaddr, |
| 92 | int sockaddr_len) |
| 93 | { |
| 94 | DEFINE_WAIT(wait); |
| 95 | struct sock *sk = sock->sk; |
| 96 | struct sockaddr_atmsvc *addr; |
| 97 | struct atm_vcc *vcc; |
| 98 | int error; |
| 99 | |
| 100 | if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) |
| 101 | return -EINVAL; |
| 102 | lock_sock(sk); |
| 103 | if (sock->state == SS_CONNECTED) { |
| 104 | error = -EISCONN; |
| 105 | goto out; |
| 106 | } |
| 107 | if (sock->state != SS_UNCONNECTED) { |
| 108 | error = -EINVAL; |
| 109 | goto out; |
| 110 | } |
| 111 | vcc = ATM_SD(sock); |
| 112 | addr = (struct sockaddr_atmsvc *) sockaddr; |
| 113 | if (addr->sas_family != AF_ATMSVC) { |
| 114 | error = -EAFNOSUPPORT; |
| 115 | goto out; |
| 116 | } |
| 117 | clear_bit(ATM_VF_BOUND,&vcc->flags); |
| 118 | /* failing rebind will kill old binding */ |
| 119 | /* @@@ check memory (de)allocation on rebind */ |
| 120 | if (!test_bit(ATM_VF_HASQOS,&vcc->flags)) { |
| 121 | error = -EBADFD; |
| 122 | goto out; |
| 123 | } |
| 124 | vcc->local = *addr; |
| 125 | set_bit(ATM_VF_WAITING, &vcc->flags); |
| 126 | prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); |
| 127 | sigd_enq(vcc,as_bind,NULL,NULL,&vcc->local); |
| 128 | while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) { |
| 129 | schedule(); |
| 130 | prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); |
| 131 | } |
| 132 | finish_wait(sk->sk_sleep, &wait); |
| 133 | clear_bit(ATM_VF_REGIS,&vcc->flags); /* doesn't count */ |
| 134 | if (!sigd) { |
| 135 | error = -EUNATCH; |
| 136 | goto out; |
| 137 | } |
| 138 | if (!sk->sk_err) |
| 139 | set_bit(ATM_VF_BOUND,&vcc->flags); |
| 140 | error = -sk->sk_err; |
| 141 | out: |
| 142 | release_sock(sk); |
| 143 | return error; |
| 144 | } |
| 145 | |
| 146 | |
| 147 | static int svc_connect(struct socket *sock,struct sockaddr *sockaddr, |
| 148 | int sockaddr_len,int flags) |
| 149 | { |
| 150 | DEFINE_WAIT(wait); |
| 151 | struct sock *sk = sock->sk; |
| 152 | struct sockaddr_atmsvc *addr; |
| 153 | struct atm_vcc *vcc = ATM_SD(sock); |
| 154 | int error; |
| 155 | |
| 156 | pr_debug("svc_connect %p\n",vcc); |
| 157 | lock_sock(sk); |
| 158 | if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) { |
| 159 | error = -EINVAL; |
| 160 | goto out; |
| 161 | } |
| 162 | |
| 163 | switch (sock->state) { |
| 164 | default: |
| 165 | error = -EINVAL; |
| 166 | goto out; |
| 167 | case SS_CONNECTED: |
| 168 | error = -EISCONN; |
| 169 | goto out; |
| 170 | case SS_CONNECTING: |
| 171 | if (test_bit(ATM_VF_WAITING, &vcc->flags)) { |
| 172 | error = -EALREADY; |
| 173 | goto out; |
| 174 | } |
| 175 | sock->state = SS_UNCONNECTED; |
| 176 | if (sk->sk_err) { |
| 177 | error = -sk->sk_err; |
| 178 | goto out; |
| 179 | } |
| 180 | break; |
| 181 | case SS_UNCONNECTED: |
| 182 | addr = (struct sockaddr_atmsvc *) sockaddr; |
| 183 | if (addr->sas_family != AF_ATMSVC) { |
| 184 | error = -EAFNOSUPPORT; |
| 185 | goto out; |
| 186 | } |
| 187 | if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) { |
| 188 | error = -EBADFD; |
| 189 | goto out; |
| 190 | } |
| 191 | if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS || |
| 192 | vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) { |
| 193 | error = -EINVAL; |
| 194 | goto out; |
| 195 | } |
| 196 | if (!vcc->qos.txtp.traffic_class && |
| 197 | !vcc->qos.rxtp.traffic_class) { |
| 198 | error = -EINVAL; |
| 199 | goto out; |
| 200 | } |
| 201 | vcc->remote = *addr; |
| 202 | set_bit(ATM_VF_WAITING, &vcc->flags); |
| 203 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
| 204 | sigd_enq(vcc,as_connect,NULL,NULL,&vcc->remote); |
| 205 | if (flags & O_NONBLOCK) { |
| 206 | finish_wait(sk->sk_sleep, &wait); |
| 207 | sock->state = SS_CONNECTING; |
| 208 | error = -EINPROGRESS; |
| 209 | goto out; |
| 210 | } |
| 211 | error = 0; |
| 212 | while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) { |
| 213 | schedule(); |
| 214 | if (!signal_pending(current)) { |
| 215 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
| 216 | continue; |
| 217 | } |
| 218 | pr_debug("*ABORT*\n"); |
| 219 | /* |
| 220 | * This is tricky: |
| 221 | * Kernel ---close--> Demon |
| 222 | * Kernel <--close--- Demon |
| 223 | * or |
| 224 | * Kernel ---close--> Demon |
| 225 | * Kernel <--error--- Demon |
| 226 | * or |
| 227 | * Kernel ---close--> Demon |
| 228 | * Kernel <--okay---- Demon |
| 229 | * Kernel <--close--- Demon |
| 230 | */ |
| 231 | sigd_enq(vcc,as_close,NULL,NULL,NULL); |
| 232 | while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) { |
| 233 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
| 234 | schedule(); |
| 235 | } |
| 236 | if (!sk->sk_err) |
| 237 | while (!test_bit(ATM_VF_RELEASED,&vcc->flags) |
| 238 | && sigd) { |
| 239 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
| 240 | schedule(); |
| 241 | } |
| 242 | clear_bit(ATM_VF_REGIS,&vcc->flags); |
| 243 | clear_bit(ATM_VF_RELEASED,&vcc->flags); |
| 244 | clear_bit(ATM_VF_CLOSE,&vcc->flags); |
| 245 | /* we're gone now but may connect later */ |
| 246 | error = -EINTR; |
| 247 | break; |
| 248 | } |
| 249 | finish_wait(sk->sk_sleep, &wait); |
| 250 | if (error) |
| 251 | goto out; |
| 252 | if (!sigd) { |
| 253 | error = -EUNATCH; |
| 254 | goto out; |
| 255 | } |
| 256 | if (sk->sk_err) { |
| 257 | error = -sk->sk_err; |
| 258 | goto out; |
| 259 | } |
| 260 | } |
| 261 | /* |
| 262 | * Not supported yet |
| 263 | * |
| 264 | * #ifndef CONFIG_SINGLE_SIGITF |
| 265 | */ |
| 266 | vcc->qos.txtp.max_pcr = SELECT_TOP_PCR(vcc->qos.txtp); |
| 267 | vcc->qos.txtp.pcr = 0; |
| 268 | vcc->qos.txtp.min_pcr = 0; |
| 269 | /* |
| 270 | * #endif |
| 271 | */ |
| 272 | if (!(error = vcc_connect(sock, vcc->itf, vcc->vpi, vcc->vci))) |
| 273 | sock->state = SS_CONNECTED; |
| 274 | else |
| 275 | (void) svc_disconnect(vcc); |
| 276 | out: |
| 277 | release_sock(sk); |
| 278 | return error; |
| 279 | } |
| 280 | |
| 281 | |
| 282 | static int svc_listen(struct socket *sock,int backlog) |
| 283 | { |
| 284 | DEFINE_WAIT(wait); |
| 285 | struct sock *sk = sock->sk; |
| 286 | struct atm_vcc *vcc = ATM_SD(sock); |
| 287 | int error; |
| 288 | |
| 289 | pr_debug("svc_listen %p\n",vcc); |
| 290 | lock_sock(sk); |
| 291 | /* let server handle listen on unbound sockets */ |
| 292 | if (test_bit(ATM_VF_SESSION,&vcc->flags)) { |
| 293 | error = -EINVAL; |
| 294 | goto out; |
| 295 | } |
| 296 | vcc_insert_socket(sk); |
| 297 | set_bit(ATM_VF_WAITING, &vcc->flags); |
| 298 | prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); |
| 299 | sigd_enq(vcc,as_listen,NULL,NULL,&vcc->local); |
| 300 | while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) { |
| 301 | schedule(); |
| 302 | prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); |
| 303 | } |
| 304 | finish_wait(sk->sk_sleep, &wait); |
| 305 | if (!sigd) { |
| 306 | error = -EUNATCH; |
| 307 | goto out; |
| 308 | } |
| 309 | set_bit(ATM_VF_LISTEN,&vcc->flags); |
| 310 | sk->sk_max_ack_backlog = backlog > 0 ? backlog : ATM_BACKLOG_DEFAULT; |
| 311 | error = -sk->sk_err; |
| 312 | out: |
| 313 | release_sock(sk); |
| 314 | return error; |
| 315 | } |
| 316 | |
| 317 | |
| 318 | static int svc_accept(struct socket *sock,struct socket *newsock,int flags) |
| 319 | { |
| 320 | struct sock *sk = sock->sk; |
| 321 | struct sk_buff *skb; |
| 322 | struct atmsvc_msg *msg; |
| 323 | struct atm_vcc *old_vcc = ATM_SD(sock); |
| 324 | struct atm_vcc *new_vcc; |
| 325 | int error; |
| 326 | |
| 327 | lock_sock(sk); |
| 328 | |
| 329 | error = svc_create(sock_net(sk), newsock,0); |
| 330 | if (error) |
| 331 | goto out; |
| 332 | |
| 333 | new_vcc = ATM_SD(newsock); |
| 334 | |
| 335 | pr_debug("svc_accept %p -> %p\n",old_vcc,new_vcc); |
| 336 | while (1) { |
| 337 | DEFINE_WAIT(wait); |
| 338 | |
| 339 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
| 340 | while (!(skb = skb_dequeue(&sk->sk_receive_queue)) && |
| 341 | sigd) { |
| 342 | if (test_bit(ATM_VF_RELEASED,&old_vcc->flags)) break; |
| 343 | if (test_bit(ATM_VF_CLOSE,&old_vcc->flags)) { |
| 344 | error = -sk->sk_err; |
| 345 | break; |
| 346 | } |
| 347 | if (flags & O_NONBLOCK) { |
| 348 | error = -EAGAIN; |
| 349 | break; |
| 350 | } |
| 351 | release_sock(sk); |
| 352 | schedule(); |
| 353 | lock_sock(sk); |
| 354 | if (signal_pending(current)) { |
| 355 | error = -ERESTARTSYS; |
| 356 | break; |
| 357 | } |
| 358 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
| 359 | } |
| 360 | finish_wait(sk->sk_sleep, &wait); |
| 361 | if (error) |
| 362 | goto out; |
| 363 | if (!skb) { |
| 364 | error = -EUNATCH; |
| 365 | goto out; |
| 366 | } |
| 367 | msg = (struct atmsvc_msg *) skb->data; |
| 368 | new_vcc->qos = msg->qos; |
| 369 | set_bit(ATM_VF_HASQOS,&new_vcc->flags); |
| 370 | new_vcc->remote = msg->svc; |
| 371 | new_vcc->local = msg->local; |
| 372 | new_vcc->sap = msg->sap; |
| 373 | error = vcc_connect(newsock, msg->pvc.sap_addr.itf, |
| 374 | msg->pvc.sap_addr.vpi, msg->pvc.sap_addr.vci); |
| 375 | dev_kfree_skb(skb); |
| 376 | sk->sk_ack_backlog--; |
| 377 | if (error) { |
| 378 | sigd_enq2(NULL,as_reject,old_vcc,NULL,NULL, |
| 379 | &old_vcc->qos,error); |
| 380 | error = error == -EAGAIN ? -EBUSY : error; |
| 381 | goto out; |
| 382 | } |
| 383 | /* wait should be short, so we ignore the non-blocking flag */ |
| 384 | set_bit(ATM_VF_WAITING, &new_vcc->flags); |
| 385 | prepare_to_wait(sk_atm(new_vcc)->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); |
| 386 | sigd_enq(new_vcc,as_accept,old_vcc,NULL,NULL); |
| 387 | while (test_bit(ATM_VF_WAITING, &new_vcc->flags) && sigd) { |
| 388 | release_sock(sk); |
| 389 | schedule(); |
| 390 | lock_sock(sk); |
| 391 | prepare_to_wait(sk_atm(new_vcc)->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); |
| 392 | } |
| 393 | finish_wait(sk_atm(new_vcc)->sk_sleep, &wait); |
| 394 | if (!sigd) { |
| 395 | error = -EUNATCH; |
| 396 | goto out; |
| 397 | } |
| 398 | if (!sk_atm(new_vcc)->sk_err) |
| 399 | break; |
| 400 | if (sk_atm(new_vcc)->sk_err != ERESTARTSYS) { |
| 401 | error = -sk_atm(new_vcc)->sk_err; |
| 402 | goto out; |
| 403 | } |
| 404 | } |
| 405 | newsock->state = SS_CONNECTED; |
| 406 | out: |
| 407 | release_sock(sk); |
| 408 | return error; |
| 409 | } |
| 410 | |
| 411 | |
| 412 | static int svc_getname(struct socket *sock,struct sockaddr *sockaddr, |
| 413 | int *sockaddr_len,int peer) |
| 414 | { |
| 415 | struct sockaddr_atmsvc *addr; |
| 416 | |
| 417 | *sockaddr_len = sizeof(struct sockaddr_atmsvc); |
| 418 | addr = (struct sockaddr_atmsvc *) sockaddr; |
| 419 | memcpy(addr,peer ? &ATM_SD(sock)->remote : &ATM_SD(sock)->local, |
| 420 | sizeof(struct sockaddr_atmsvc)); |
| 421 | return 0; |
| 422 | } |
| 423 | |
| 424 | |
| 425 | int svc_change_qos(struct atm_vcc *vcc,struct atm_qos *qos) |
| 426 | { |
| 427 | struct sock *sk = sk_atm(vcc); |
| 428 | DEFINE_WAIT(wait); |
| 429 | |
| 430 | set_bit(ATM_VF_WAITING, &vcc->flags); |
| 431 | prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); |
| 432 | sigd_enq2(vcc,as_modify,NULL,NULL,&vcc->local,qos,0); |
| 433 | while (test_bit(ATM_VF_WAITING, &vcc->flags) && |
| 434 | !test_bit(ATM_VF_RELEASED, &vcc->flags) && sigd) { |
| 435 | schedule(); |
| 436 | prepare_to_wait(sk->sk_sleep, &wait, TASK_UNINTERRUPTIBLE); |
| 437 | } |
| 438 | finish_wait(sk->sk_sleep, &wait); |
| 439 | if (!sigd) return -EUNATCH; |
| 440 | return -sk->sk_err; |
| 441 | } |
| 442 | |
| 443 | |
| 444 | static int svc_setsockopt(struct socket *sock, int level, int optname, |
| 445 | char __user *optval, int optlen) |
| 446 | { |
| 447 | struct sock *sk = sock->sk; |
| 448 | struct atm_vcc *vcc = ATM_SD(sock); |
| 449 | int value, error = 0; |
| 450 | |
| 451 | lock_sock(sk); |
| 452 | switch (optname) { |
| 453 | case SO_ATMSAP: |
| 454 | if (level != SOL_ATM || optlen != sizeof(struct atm_sap)) { |
| 455 | error = -EINVAL; |
| 456 | goto out; |
| 457 | } |
| 458 | if (copy_from_user(&vcc->sap, optval, optlen)) { |
| 459 | error = -EFAULT; |
| 460 | goto out; |
| 461 | } |
| 462 | set_bit(ATM_VF_HASSAP, &vcc->flags); |
| 463 | break; |
| 464 | case SO_MULTIPOINT: |
| 465 | if (level != SOL_ATM || optlen != sizeof(int)) { |
| 466 | error = -EINVAL; |
| 467 | goto out; |
| 468 | } |
| 469 | if (get_user(value, (int __user *) optval)) { |
| 470 | error = -EFAULT; |
| 471 | goto out; |
| 472 | } |
| 473 | if (value == 1) { |
| 474 | set_bit(ATM_VF_SESSION, &vcc->flags); |
| 475 | } else if (value == 0) { |
| 476 | clear_bit(ATM_VF_SESSION, &vcc->flags); |
| 477 | } else { |
| 478 | error = -EINVAL; |
| 479 | } |
| 480 | break; |
| 481 | default: |
| 482 | error = vcc_setsockopt(sock, level, optname, |
| 483 | optval, optlen); |
| 484 | } |
| 485 | |
| 486 | out: |
| 487 | release_sock(sk); |
| 488 | return error; |
| 489 | } |
| 490 | |
| 491 | |
| 492 | static int svc_getsockopt(struct socket *sock,int level,int optname, |
| 493 | char __user *optval,int __user *optlen) |
| 494 | { |
| 495 | struct sock *sk = sock->sk; |
| 496 | int error = 0, len; |
| 497 | |
| 498 | lock_sock(sk); |
| 499 | if (!__SO_LEVEL_MATCH(optname, level) || optname != SO_ATMSAP) { |
| 500 | error = vcc_getsockopt(sock, level, optname, optval, optlen); |
| 501 | goto out; |
| 502 | } |
| 503 | if (get_user(len, optlen)) { |
| 504 | error = -EFAULT; |
| 505 | goto out; |
| 506 | } |
| 507 | if (len != sizeof(struct atm_sap)) { |
| 508 | error = -EINVAL; |
| 509 | goto out; |
| 510 | } |
| 511 | if (copy_to_user(optval, &ATM_SD(sock)->sap, sizeof(struct atm_sap))) { |
| 512 | error = -EFAULT; |
| 513 | goto out; |
| 514 | } |
| 515 | out: |
| 516 | release_sock(sk); |
| 517 | return error; |
| 518 | } |
| 519 | |
| 520 | |
| 521 | static int svc_addparty(struct socket *sock, struct sockaddr *sockaddr, |
| 522 | int sockaddr_len, int flags) |
| 523 | { |
| 524 | DEFINE_WAIT(wait); |
| 525 | struct sock *sk = sock->sk; |
| 526 | struct atm_vcc *vcc = ATM_SD(sock); |
| 527 | int error; |
| 528 | |
| 529 | lock_sock(sk); |
| 530 | set_bit(ATM_VF_WAITING, &vcc->flags); |
| 531 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
| 532 | sigd_enq(vcc, as_addparty, NULL, NULL, |
| 533 | (struct sockaddr_atmsvc *) sockaddr); |
| 534 | if (flags & O_NONBLOCK) { |
| 535 | finish_wait(sk->sk_sleep, &wait); |
| 536 | error = -EINPROGRESS; |
| 537 | goto out; |
| 538 | } |
| 539 | pr_debug("svc_addparty added wait queue\n"); |
| 540 | while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) { |
| 541 | schedule(); |
| 542 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
| 543 | } |
| 544 | finish_wait(sk->sk_sleep, &wait); |
| 545 | error = xchg(&sk->sk_err_soft, 0); |
| 546 | out: |
| 547 | release_sock(sk); |
| 548 | return error; |
| 549 | } |
| 550 | |
| 551 | |
| 552 | static int svc_dropparty(struct socket *sock, int ep_ref) |
| 553 | { |
| 554 | DEFINE_WAIT(wait); |
| 555 | struct sock *sk = sock->sk; |
| 556 | struct atm_vcc *vcc = ATM_SD(sock); |
| 557 | int error; |
| 558 | |
| 559 | lock_sock(sk); |
| 560 | set_bit(ATM_VF_WAITING, &vcc->flags); |
| 561 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
| 562 | sigd_enq2(vcc, as_dropparty, NULL, NULL, NULL, NULL, ep_ref); |
| 563 | while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) { |
| 564 | schedule(); |
| 565 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
| 566 | } |
| 567 | finish_wait(sk->sk_sleep, &wait); |
| 568 | if (!sigd) { |
| 569 | error = -EUNATCH; |
| 570 | goto out; |
| 571 | } |
| 572 | error = xchg(&sk->sk_err_soft, 0); |
| 573 | out: |
| 574 | release_sock(sk); |
| 575 | return error; |
| 576 | } |
| 577 | |
| 578 | |
| 579 | static int svc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| 580 | { |
| 581 | int error, ep_ref; |
| 582 | struct sockaddr_atmsvc sa; |
| 583 | struct atm_vcc *vcc = ATM_SD(sock); |
| 584 | |
| 585 | switch (cmd) { |
| 586 | case ATM_ADDPARTY: |
| 587 | if (!test_bit(ATM_VF_SESSION, &vcc->flags)) |
| 588 | return -EINVAL; |
| 589 | if (copy_from_user(&sa, (void __user *) arg, sizeof(sa))) |
| 590 | return -EFAULT; |
| 591 | error = svc_addparty(sock, (struct sockaddr *) &sa, sizeof(sa), 0); |
| 592 | break; |
| 593 | case ATM_DROPPARTY: |
| 594 | if (!test_bit(ATM_VF_SESSION, &vcc->flags)) |
| 595 | return -EINVAL; |
| 596 | if (copy_from_user(&ep_ref, (void __user *) arg, sizeof(int))) |
| 597 | return -EFAULT; |
| 598 | error = svc_dropparty(sock, ep_ref); |
| 599 | break; |
| 600 | default: |
| 601 | error = vcc_ioctl(sock, cmd, arg); |
| 602 | } |
| 603 | |
| 604 | return error; |
| 605 | } |
| 606 | |
| 607 | static const struct proto_ops svc_proto_ops = { |
| 608 | .family = PF_ATMSVC, |
| 609 | .owner = THIS_MODULE, |
| 610 | |
| 611 | .release = svc_release, |
| 612 | .bind = svc_bind, |
| 613 | .connect = svc_connect, |
| 614 | .socketpair = sock_no_socketpair, |
| 615 | .accept = svc_accept, |
| 616 | .getname = svc_getname, |
| 617 | .poll = vcc_poll, |
| 618 | .ioctl = svc_ioctl, |
| 619 | .listen = svc_listen, |
| 620 | .shutdown = svc_shutdown, |
| 621 | .setsockopt = svc_setsockopt, |
| 622 | .getsockopt = svc_getsockopt, |
| 623 | .sendmsg = vcc_sendmsg, |
| 624 | .recvmsg = vcc_recvmsg, |
| 625 | .mmap = sock_no_mmap, |
| 626 | .sendpage = sock_no_sendpage, |
| 627 | }; |
| 628 | |
| 629 | |
| 630 | static int svc_create(struct net *net, struct socket *sock,int protocol) |
| 631 | { |
| 632 | int error; |
| 633 | |
| 634 | if (net != &init_net) |
| 635 | return -EAFNOSUPPORT; |
| 636 | |
| 637 | sock->ops = &svc_proto_ops; |
| 638 | error = vcc_create(net, sock, protocol, AF_ATMSVC); |
| 639 | if (error) return error; |
| 640 | ATM_SD(sock)->local.sas_family = AF_ATMSVC; |
| 641 | ATM_SD(sock)->remote.sas_family = AF_ATMSVC; |
| 642 | return 0; |
| 643 | } |
| 644 | |
| 645 | |
| 646 | static struct net_proto_family svc_family_ops = { |
| 647 | .family = PF_ATMSVC, |
| 648 | .create = svc_create, |
| 649 | .owner = THIS_MODULE, |
| 650 | }; |
| 651 | |
| 652 | |
| 653 | /* |
| 654 | * Initialize the ATM SVC protocol family |
| 655 | */ |
| 656 | |
| 657 | int __init atmsvc_init(void) |
| 658 | { |
| 659 | return sock_register(&svc_family_ops); |
| 660 | } |
| 661 | |
| 662 | void atmsvc_exit(void) |
| 663 | { |
| 664 | sock_unregister(PF_ATMSVC); |
| 665 | } |