1 /* net/atm/common.c - ATM sockets (common part for PVC and SVC) */ 2 3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ 4 5 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ 6 7 #include <linux/module.h> 8 #include <linux/kmod.h> 9 #include <linux/net.h> /* struct socket, struct proto_ops */ 10 #include <linux/atm.h> /* ATM stuff */ 11 #include <linux/atmdev.h> 12 #include <linux/socket.h> /* SOL_SOCKET */ 13 #include <linux/errno.h> /* error codes */ 14 #include <linux/capability.h> 15 #include <linux/mm.h> 16 #include <linux/sched.h> 17 #include <linux/time.h> /* struct timeval */ 18 #include <linux/skbuff.h> 19 #include <linux/bitops.h> 20 #include <linux/init.h> 21 #include <linux/slab.h> 22 #include <net/sock.h> /* struct sock */ 23 #include <linux/uaccess.h> 24 #include <linux/poll.h> 25 26 #include <asm/atomic.h> 27 28 #include "resources.h" /* atm_find_dev */ 29 #include "common.h" /* prototypes */ 30 #include "protocols.h" /* atm_init_<transport> */ 31 #include "addr.h" /* address registry */ 32 #include "signaling.h" /* for WAITING and sigd_attach */ 33 34 struct hlist_head vcc_hash[VCC_HTABLE_SIZE]; 35 EXPORT_SYMBOL(vcc_hash); 36 37 DEFINE_RWLOCK(vcc_sklist_lock); 38 EXPORT_SYMBOL(vcc_sklist_lock); 39 40 static ATOMIC_NOTIFIER_HEAD(atm_dev_notify_chain); 41 42 static void __vcc_insert_socket(struct sock *sk) 43 { 44 struct atm_vcc *vcc = atm_sk(sk); 45 struct hlist_head *head = &vcc_hash[vcc->vci & (VCC_HTABLE_SIZE - 1)]; 46 sk->sk_hash = vcc->vci & (VCC_HTABLE_SIZE - 1); 47 sk_add_node(sk, head); 48 } 49 50 void vcc_insert_socket(struct sock *sk) 51 { 52 write_lock_irq(&vcc_sklist_lock); 53 __vcc_insert_socket(sk); 54 write_unlock_irq(&vcc_sklist_lock); 55 } 56 EXPORT_SYMBOL(vcc_insert_socket); 57 58 static void vcc_remove_socket(struct sock *sk) 59 { 60 write_lock_irq(&vcc_sklist_lock); 61 sk_del_node_init(sk); 62 write_unlock_irq(&vcc_sklist_lock); 63 } 64 65 static struct sk_buff *alloc_tx(struct atm_vcc *vcc, unsigned int size) 66 { 67 struct sk_buff *skb; 68 struct sock *sk = sk_atm(vcc); 69 70 if (sk_wmem_alloc_get(sk) && !atm_may_send(vcc, size)) { 71 pr_debug("Sorry: wmem_alloc = %d, size = %d, sndbuf = %d\n", 72 sk_wmem_alloc_get(sk), size, sk->sk_sndbuf); 73 return NULL; 74 } 75 while (!(skb = alloc_skb(size, GFP_KERNEL))) 76 schedule(); 77 pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize); 78 atomic_add(skb->truesize, &sk->sk_wmem_alloc); 79 return skb; 80 } 81 82 static void vcc_sock_destruct(struct sock *sk) 83 { 84 if (atomic_read(&sk->sk_rmem_alloc)) 85 printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n", 86 __func__, atomic_read(&sk->sk_rmem_alloc)); 87 88 if (atomic_read(&sk->sk_wmem_alloc)) 89 printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n", 90 __func__, atomic_read(&sk->sk_wmem_alloc)); 91 } 92 93 static void vcc_def_wakeup(struct sock *sk) 94 { 95 struct socket_wq *wq; 96 97 rcu_read_lock(); 98 wq = rcu_dereference(sk->sk_wq); 99 if (wq_has_sleeper(wq)) 100 wake_up(&wq->wait); 101 rcu_read_unlock(); 102 } 103 104 static inline int vcc_writable(struct sock *sk) 105 { 106 struct atm_vcc *vcc = atm_sk(sk); 107 108 return (vcc->qos.txtp.max_sdu + 109 atomic_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf; 110 } 111 112 static void vcc_write_space(struct sock *sk) 113 { 114 struct socket_wq *wq; 115 116 rcu_read_lock(); 117 118 if (vcc_writable(sk)) { 119 wq = rcu_dereference(sk->sk_wq); 120 if (wq_has_sleeper(wq)) 121 wake_up_interruptible(&wq->wait); 122 123 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 124 } 125 126 rcu_read_unlock(); 127 } 128 129 static struct proto vcc_proto = { 130 .name = "VCC", 131 .owner = THIS_MODULE, 132 .obj_size = sizeof(struct atm_vcc), 133 }; 134 135 int vcc_create(struct net *net, struct socket *sock, int protocol, int family) 136 { 137 struct sock *sk; 138 struct atm_vcc *vcc; 139 140 sock->sk = NULL; 141 if (sock->type == SOCK_STREAM) 142 return -EINVAL; 143 sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto); 144 if (!sk) 145 return -ENOMEM; 146 sock_init_data(sock, sk); 147 sk->sk_state_change = vcc_def_wakeup; 148 sk->sk_write_space = vcc_write_space; 149 150 vcc = atm_sk(sk); 151 vcc->dev = NULL; 152 memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc)); 153 memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc)); 154 vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */ 155 atomic_set(&sk->sk_wmem_alloc, 1); 156 atomic_set(&sk->sk_rmem_alloc, 0); 157 vcc->push = NULL; 158 vcc->pop = NULL; 159 vcc->push_oam = NULL; 160 vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */ 161 vcc->atm_options = vcc->aal_options = 0; 162 sk->sk_destruct = vcc_sock_destruct; 163 return 0; 164 } 165 166 static void vcc_destroy_socket(struct sock *sk) 167 { 168 struct atm_vcc *vcc = atm_sk(sk); 169 struct sk_buff *skb; 170 171 set_bit(ATM_VF_CLOSE, &vcc->flags); 172 clear_bit(ATM_VF_READY, &vcc->flags); 173 if (vcc->dev) { 174 if (vcc->dev->ops->close) 175 vcc->dev->ops->close(vcc); 176 if (vcc->push) 177 vcc->push(vcc, NULL); /* atmarpd has no push */ 178 179 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 180 atm_return(vcc, skb->truesize); 181 kfree_skb(skb); 182 } 183 184 module_put(vcc->dev->ops->owner); 185 atm_dev_put(vcc->dev); 186 } 187 188 vcc_remove_socket(sk); 189 } 190 191 int vcc_release(struct socket *sock) 192 { 193 struct sock *sk = sock->sk; 194 195 if (sk) { 196 lock_sock(sk); 197 vcc_destroy_socket(sock->sk); 198 release_sock(sk); 199 sock_put(sk); 200 } 201 202 return 0; 203 } 204 205 void vcc_release_async(struct atm_vcc *vcc, int reply) 206 { 207 struct sock *sk = sk_atm(vcc); 208 209 set_bit(ATM_VF_CLOSE, &vcc->flags); 210 sk->sk_shutdown |= RCV_SHUTDOWN; 211 sk->sk_err = -reply; 212 clear_bit(ATM_VF_WAITING, &vcc->flags); 213 sk->sk_state_change(sk); 214 } 215 EXPORT_SYMBOL(vcc_release_async); 216 217 void atm_dev_signal_change(struct atm_dev *dev, char signal) 218 { 219 pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n", 220 __func__, signal, dev, dev->number, dev->signal); 221 222 /* atm driver sending invalid signal */ 223 WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND); 224 225 if (dev->signal == signal) 226 return; /* no change */ 227 228 dev->signal = signal; 229 230 atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev); 231 } 232 EXPORT_SYMBOL(atm_dev_signal_change); 233 234 void atm_dev_release_vccs(struct atm_dev *dev) 235 { 236 int i; 237 238 write_lock_irq(&vcc_sklist_lock); 239 for (i = 0; i < VCC_HTABLE_SIZE; i++) { 240 struct hlist_head *head = &vcc_hash[i]; 241 struct hlist_node *node, *tmp; 242 struct sock *s; 243 struct atm_vcc *vcc; 244 245 sk_for_each_safe(s, node, tmp, head) { 246 vcc = atm_sk(s); 247 if (vcc->dev == dev) { 248 vcc_release_async(vcc, -EPIPE); 249 sk_del_node_init(s); 250 } 251 } 252 } 253 write_unlock_irq(&vcc_sklist_lock); 254 } 255 256 static int adjust_tp(struct atm_trafprm *tp, unsigned char aal) 257 { 258 int max_sdu; 259 260 if (!tp->traffic_class) 261 return 0; 262 switch (aal) { 263 case ATM_AAL0: 264 max_sdu = ATM_CELL_SIZE-1; 265 break; 266 case ATM_AAL34: 267 max_sdu = ATM_MAX_AAL34_PDU; 268 break; 269 default: 270 pr_warning("AAL problems ... (%d)\n", aal); 271 /* fall through */ 272 case ATM_AAL5: 273 max_sdu = ATM_MAX_AAL5_PDU; 274 } 275 if (!tp->max_sdu) 276 tp->max_sdu = max_sdu; 277 else if (tp->max_sdu > max_sdu) 278 return -EINVAL; 279 if (!tp->max_cdv) 280 tp->max_cdv = ATM_MAX_CDV; 281 return 0; 282 } 283 284 static int check_ci(const struct atm_vcc *vcc, short vpi, int vci) 285 { 286 struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)]; 287 struct hlist_node *node; 288 struct sock *s; 289 struct atm_vcc *walk; 290 291 sk_for_each(s, node, head) { 292 walk = atm_sk(s); 293 if (walk->dev != vcc->dev) 294 continue; 295 if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi && 296 walk->vci == vci && ((walk->qos.txtp.traffic_class != 297 ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) || 298 (walk->qos.rxtp.traffic_class != ATM_NONE && 299 vcc->qos.rxtp.traffic_class != ATM_NONE))) 300 return -EADDRINUSE; 301 } 302 303 /* allow VCCs with same VPI/VCI iff they don't collide on 304 TX/RX (but we may refuse such sharing for other reasons, 305 e.g. if protocol requires to have both channels) */ 306 307 return 0; 308 } 309 310 static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci) 311 { 312 static short p; /* poor man's per-device cache */ 313 static int c; 314 short old_p; 315 int old_c; 316 int err; 317 318 if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) { 319 err = check_ci(vcc, *vpi, *vci); 320 return err; 321 } 322 /* last scan may have left values out of bounds for current device */ 323 if (*vpi != ATM_VPI_ANY) 324 p = *vpi; 325 else if (p >= 1 << vcc->dev->ci_range.vpi_bits) 326 p = 0; 327 if (*vci != ATM_VCI_ANY) 328 c = *vci; 329 else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits) 330 c = ATM_NOT_RSV_VCI; 331 old_p = p; 332 old_c = c; 333 do { 334 if (!check_ci(vcc, p, c)) { 335 *vpi = p; 336 *vci = c; 337 return 0; 338 } 339 if (*vci == ATM_VCI_ANY) { 340 c++; 341 if (c >= 1 << vcc->dev->ci_range.vci_bits) 342 c = ATM_NOT_RSV_VCI; 343 } 344 if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) && 345 *vpi == ATM_VPI_ANY) { 346 p++; 347 if (p >= 1 << vcc->dev->ci_range.vpi_bits) 348 p = 0; 349 } 350 } while (old_p != p || old_c != c); 351 return -EADDRINUSE; 352 } 353 354 static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi, 355 int vci) 356 { 357 struct sock *sk = sk_atm(vcc); 358 int error; 359 360 if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY && 361 vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC && 362 vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits)) 363 return -EINVAL; 364 if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE)) 365 return -EPERM; 366 error = -ENODEV; 367 if (!try_module_get(dev->ops->owner)) 368 return error; 369 vcc->dev = dev; 370 write_lock_irq(&vcc_sklist_lock); 371 if (test_bit(ATM_DF_REMOVED, &dev->flags) || 372 (error = find_ci(vcc, &vpi, &vci))) { 373 write_unlock_irq(&vcc_sklist_lock); 374 goto fail_module_put; 375 } 376 vcc->vpi = vpi; 377 vcc->vci = vci; 378 __vcc_insert_socket(sk); 379 write_unlock_irq(&vcc_sklist_lock); 380 switch (vcc->qos.aal) { 381 case ATM_AAL0: 382 error = atm_init_aal0(vcc); 383 vcc->stats = &dev->stats.aal0; 384 break; 385 case ATM_AAL34: 386 error = atm_init_aal34(vcc); 387 vcc->stats = &dev->stats.aal34; 388 break; 389 case ATM_NO_AAL: 390 /* ATM_AAL5 is also used in the "0 for default" case */ 391 vcc->qos.aal = ATM_AAL5; 392 /* fall through */ 393 case ATM_AAL5: 394 error = atm_init_aal5(vcc); 395 vcc->stats = &dev->stats.aal5; 396 break; 397 default: 398 error = -EPROTOTYPE; 399 } 400 if (!error) 401 error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal); 402 if (!error) 403 error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal); 404 if (error) 405 goto fail; 406 pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal); 407 pr_debug(" TX: %d, PCR %d..%d, SDU %d\n", 408 vcc->qos.txtp.traffic_class, 409 vcc->qos.txtp.min_pcr, 410 vcc->qos.txtp.max_pcr, 411 vcc->qos.txtp.max_sdu); 412 pr_debug(" RX: %d, PCR %d..%d, SDU %d\n", 413 vcc->qos.rxtp.traffic_class, 414 vcc->qos.rxtp.min_pcr, 415 vcc->qos.rxtp.max_pcr, 416 vcc->qos.rxtp.max_sdu); 417 418 if (dev->ops->open) { 419 error = dev->ops->open(vcc); 420 if (error) 421 goto fail; 422 } 423 return 0; 424 425 fail: 426 vcc_remove_socket(sk); 427 fail_module_put: 428 module_put(dev->ops->owner); 429 /* ensure we get dev module ref count correct */ 430 vcc->dev = NULL; 431 return error; 432 } 433 434 int vcc_connect(struct socket *sock, int itf, short vpi, int vci) 435 { 436 struct atm_dev *dev; 437 struct atm_vcc *vcc = ATM_SD(sock); 438 int error; 439 440 pr_debug("(vpi %d, vci %d)\n", vpi, vci); 441 if (sock->state == SS_CONNECTED) 442 return -EISCONN; 443 if (sock->state != SS_UNCONNECTED) 444 return -EINVAL; 445 if (!(vpi || vci)) 446 return -EINVAL; 447 448 if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC) 449 clear_bit(ATM_VF_PARTIAL, &vcc->flags); 450 else 451 if (test_bit(ATM_VF_PARTIAL, &vcc->flags)) 452 return -EINVAL; 453 pr_debug("(TX: cl %d,bw %d-%d,sdu %d; " 454 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n", 455 vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr, 456 vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu, 457 vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr, 458 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu, 459 vcc->qos.aal == ATM_AAL5 ? "" : 460 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ", 461 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal); 462 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) 463 return -EBADFD; 464 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS || 465 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) 466 return -EINVAL; 467 if (likely(itf != ATM_ITF_ANY)) { 468 dev = try_then_request_module(atm_dev_lookup(itf), 469 "atm-device-%d", itf); 470 } else { 471 dev = NULL; 472 mutex_lock(&atm_dev_mutex); 473 if (!list_empty(&atm_devs)) { 474 dev = list_entry(atm_devs.next, 475 struct atm_dev, dev_list); 476 atm_dev_hold(dev); 477 } 478 mutex_unlock(&atm_dev_mutex); 479 } 480 if (!dev) 481 return -ENODEV; 482 error = __vcc_connect(vcc, dev, vpi, vci); 483 if (error) { 484 atm_dev_put(dev); 485 return error; 486 } 487 if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC) 488 set_bit(ATM_VF_PARTIAL, &vcc->flags); 489 if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags)) 490 sock->state = SS_CONNECTED; 491 return 0; 492 } 493 494 int vcc_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 495 size_t size, int flags) 496 { 497 struct sock *sk = sock->sk; 498 struct atm_vcc *vcc; 499 struct sk_buff *skb; 500 int copied, error = -EINVAL; 501 502 if (sock->state != SS_CONNECTED) 503 return -ENOTCONN; 504 if (flags & ~MSG_DONTWAIT) /* only handle MSG_DONTWAIT */ 505 return -EOPNOTSUPP; 506 vcc = ATM_SD(sock); 507 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 508 test_bit(ATM_VF_CLOSE, &vcc->flags) || 509 !test_bit(ATM_VF_READY, &vcc->flags)) 510 return 0; 511 512 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error); 513 if (!skb) 514 return error; 515 516 copied = skb->len; 517 if (copied > size) { 518 copied = size; 519 msg->msg_flags |= MSG_TRUNC; 520 } 521 522 error = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 523 if (error) 524 return error; 525 sock_recv_ts_and_drops(msg, sk, skb); 526 pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc), skb->truesize); 527 atm_return(vcc, skb->truesize); 528 skb_free_datagram(sk, skb); 529 return copied; 530 } 531 532 int vcc_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 533 size_t total_len) 534 { 535 struct sock *sk = sock->sk; 536 DEFINE_WAIT(wait); 537 struct atm_vcc *vcc; 538 struct sk_buff *skb; 539 int eff, error; 540 const void __user *buff; 541 int size; 542 543 lock_sock(sk); 544 if (sock->state != SS_CONNECTED) { 545 error = -ENOTCONN; 546 goto out; 547 } 548 if (m->msg_name) { 549 error = -EISCONN; 550 goto out; 551 } 552 if (m->msg_iovlen != 1) { 553 error = -ENOSYS; /* fix this later @@@ */ 554 goto out; 555 } 556 buff = m->msg_iov->iov_base; 557 size = m->msg_iov->iov_len; 558 vcc = ATM_SD(sock); 559 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 560 test_bit(ATM_VF_CLOSE, &vcc->flags) || 561 !test_bit(ATM_VF_READY, &vcc->flags)) { 562 error = -EPIPE; 563 send_sig(SIGPIPE, current, 0); 564 goto out; 565 } 566 if (!size) { 567 error = 0; 568 goto out; 569 } 570 if (size < 0 || size > vcc->qos.txtp.max_sdu) { 571 error = -EMSGSIZE; 572 goto out; 573 } 574 575 eff = (size+3) & ~3; /* align to word boundary */ 576 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 577 error = 0; 578 while (!(skb = alloc_tx(vcc, eff))) { 579 if (m->msg_flags & MSG_DONTWAIT) { 580 error = -EAGAIN; 581 break; 582 } 583 schedule(); 584 if (signal_pending(current)) { 585 error = -ERESTARTSYS; 586 break; 587 } 588 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 589 test_bit(ATM_VF_CLOSE, &vcc->flags) || 590 !test_bit(ATM_VF_READY, &vcc->flags)) { 591 error = -EPIPE; 592 send_sig(SIGPIPE, current, 0); 593 break; 594 } 595 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 596 } 597 finish_wait(sk_sleep(sk), &wait); 598 if (error) 599 goto out; 600 skb->dev = NULL; /* for paths shared with net_device interfaces */ 601 ATM_SKB(skb)->atm_options = vcc->atm_options; 602 if (copy_from_user(skb_put(skb, size), buff, size)) { 603 kfree_skb(skb); 604 error = -EFAULT; 605 goto out; 606 } 607 if (eff != size) 608 memset(skb->data + size, 0, eff-size); 609 error = vcc->dev->ops->send(vcc, skb); 610 error = error ? error : size; 611 out: 612 release_sock(sk); 613 return error; 614 } 615 616 unsigned int vcc_poll(struct file *file, struct socket *sock, poll_table *wait) 617 { 618 struct sock *sk = sock->sk; 619 struct atm_vcc *vcc; 620 unsigned int mask; 621 622 sock_poll_wait(file, sk_sleep(sk), wait); 623 mask = 0; 624 625 vcc = ATM_SD(sock); 626 627 /* exceptional events */ 628 if (sk->sk_err) 629 mask = POLLERR; 630 631 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 632 test_bit(ATM_VF_CLOSE, &vcc->flags)) 633 mask |= POLLHUP; 634 635 /* readable? */ 636 if (!skb_queue_empty(&sk->sk_receive_queue)) 637 mask |= POLLIN | POLLRDNORM; 638 639 /* writable? */ 640 if (sock->state == SS_CONNECTING && 641 test_bit(ATM_VF_WAITING, &vcc->flags)) 642 return mask; 643 644 if (vcc->qos.txtp.traffic_class != ATM_NONE && 645 vcc_writable(sk)) 646 mask |= POLLOUT | POLLWRNORM | POLLWRBAND; 647 648 return mask; 649 } 650 651 static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos) 652 { 653 int error; 654 655 /* 656 * Don't let the QoS change the already connected AAL type nor the 657 * traffic class. 658 */ 659 if (qos->aal != vcc->qos.aal || 660 qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class || 661 qos->txtp.traffic_class != vcc->qos.txtp.traffic_class) 662 return -EINVAL; 663 error = adjust_tp(&qos->txtp, qos->aal); 664 if (!error) 665 error = adjust_tp(&qos->rxtp, qos->aal); 666 if (error) 667 return error; 668 if (!vcc->dev->ops->change_qos) 669 return -EOPNOTSUPP; 670 if (sk_atm(vcc)->sk_family == AF_ATMPVC) 671 return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET); 672 return svc_change_qos(vcc, qos); 673 } 674 675 static int check_tp(const struct atm_trafprm *tp) 676 { 677 /* @@@ Should be merged with adjust_tp */ 678 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS) 679 return 0; 680 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr && 681 !tp->max_pcr) 682 return -EINVAL; 683 if (tp->min_pcr == ATM_MAX_PCR) 684 return -EINVAL; 685 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR && 686 tp->min_pcr > tp->max_pcr) 687 return -EINVAL; 688 /* 689 * We allow pcr to be outside [min_pcr,max_pcr], because later 690 * adjustment may still push it in the valid range. 691 */ 692 return 0; 693 } 694 695 static int check_qos(const struct atm_qos *qos) 696 { 697 int error; 698 699 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class) 700 return -EINVAL; 701 if (qos->txtp.traffic_class != qos->rxtp.traffic_class && 702 qos->txtp.traffic_class && qos->rxtp.traffic_class && 703 qos->txtp.traffic_class != ATM_ANYCLASS && 704 qos->rxtp.traffic_class != ATM_ANYCLASS) 705 return -EINVAL; 706 error = check_tp(&qos->txtp); 707 if (error) 708 return error; 709 return check_tp(&qos->rxtp); 710 } 711 712 int vcc_setsockopt(struct socket *sock, int level, int optname, 713 char __user *optval, unsigned int optlen) 714 { 715 struct atm_vcc *vcc; 716 unsigned long value; 717 int error; 718 719 if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname)) 720 return -EINVAL; 721 722 vcc = ATM_SD(sock); 723 switch (optname) { 724 case SO_ATMQOS: 725 { 726 struct atm_qos qos; 727 728 if (copy_from_user(&qos, optval, sizeof(qos))) 729 return -EFAULT; 730 error = check_qos(&qos); 731 if (error) 732 return error; 733 if (sock->state == SS_CONNECTED) 734 return atm_change_qos(vcc, &qos); 735 if (sock->state != SS_UNCONNECTED) 736 return -EBADFD; 737 vcc->qos = qos; 738 set_bit(ATM_VF_HASQOS, &vcc->flags); 739 return 0; 740 } 741 case SO_SETCLP: 742 if (get_user(value, (unsigned long __user *)optval)) 743 return -EFAULT; 744 if (value) 745 vcc->atm_options |= ATM_ATMOPT_CLP; 746 else 747 vcc->atm_options &= ~ATM_ATMOPT_CLP; 748 return 0; 749 default: 750 if (level == SOL_SOCKET) 751 return -EINVAL; 752 break; 753 } 754 if (!vcc->dev || !vcc->dev->ops->setsockopt) 755 return -EINVAL; 756 return vcc->dev->ops->setsockopt(vcc, level, optname, optval, optlen); 757 } 758 759 int vcc_getsockopt(struct socket *sock, int level, int optname, 760 char __user *optval, int __user *optlen) 761 { 762 struct atm_vcc *vcc; 763 int len; 764 765 if (get_user(len, optlen)) 766 return -EFAULT; 767 if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname)) 768 return -EINVAL; 769 770 vcc = ATM_SD(sock); 771 switch (optname) { 772 case SO_ATMQOS: 773 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) 774 return -EINVAL; 775 return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos)) 776 ? -EFAULT : 0; 777 case SO_SETCLP: 778 return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0, 779 (unsigned long __user *)optval) ? -EFAULT : 0; 780 case SO_ATMPVC: 781 { 782 struct sockaddr_atmpvc pvc; 783 784 if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags)) 785 return -ENOTCONN; 786 pvc.sap_family = AF_ATMPVC; 787 pvc.sap_addr.itf = vcc->dev->number; 788 pvc.sap_addr.vpi = vcc->vpi; 789 pvc.sap_addr.vci = vcc->vci; 790 return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0; 791 } 792 default: 793 if (level == SOL_SOCKET) 794 return -EINVAL; 795 break; 796 } 797 if (!vcc->dev || !vcc->dev->ops->getsockopt) 798 return -EINVAL; 799 return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len); 800 } 801 802 int register_atmdevice_notifier(struct notifier_block *nb) 803 { 804 return atomic_notifier_chain_register(&atm_dev_notify_chain, nb); 805 } 806 EXPORT_SYMBOL_GPL(register_atmdevice_notifier); 807 808 void unregister_atmdevice_notifier(struct notifier_block *nb) 809 { 810 atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb); 811 } 812 EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier); 813 814 static int __init atm_init(void) 815 { 816 int error; 817 818 error = proto_register(&vcc_proto, 0); 819 if (error < 0) 820 goto out; 821 error = atmpvc_init(); 822 if (error < 0) { 823 pr_err("atmpvc_init() failed with %d\n", error); 824 goto out_unregister_vcc_proto; 825 } 826 error = atmsvc_init(); 827 if (error < 0) { 828 pr_err("atmsvc_init() failed with %d\n", error); 829 goto out_atmpvc_exit; 830 } 831 error = atm_proc_init(); 832 if (error < 0) { 833 pr_err("atm_proc_init() failed with %d\n", error); 834 goto out_atmsvc_exit; 835 } 836 error = atm_sysfs_init(); 837 if (error < 0) { 838 pr_err("atm_sysfs_init() failed with %d\n", error); 839 goto out_atmproc_exit; 840 } 841 out: 842 return error; 843 out_atmproc_exit: 844 atm_proc_exit(); 845 out_atmsvc_exit: 846 atmsvc_exit(); 847 out_atmpvc_exit: 848 atmsvc_exit(); 849 out_unregister_vcc_proto: 850 proto_unregister(&vcc_proto); 851 goto out; 852 } 853 854 static void __exit atm_exit(void) 855 { 856 atm_proc_exit(); 857 atm_sysfs_exit(); 858 atmsvc_exit(); 859 atmpvc_exit(); 860 proto_unregister(&vcc_proto); 861 } 862 863 subsys_initcall(atm_init); 864 865 module_exit(atm_exit); 866 867 MODULE_LICENSE("GPL"); 868 MODULE_ALIAS_NETPROTO(PF_ATMPVC); 869 MODULE_ALIAS_NETPROTO(PF_ATMSVC); 870