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 <linux/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 EXPORT_SYMBOL(atm_dev_release_vccs); 256 257 static int adjust_tp(struct atm_trafprm *tp, unsigned char aal) 258 { 259 int max_sdu; 260 261 if (!tp->traffic_class) 262 return 0; 263 switch (aal) { 264 case ATM_AAL0: 265 max_sdu = ATM_CELL_SIZE-1; 266 break; 267 case ATM_AAL34: 268 max_sdu = ATM_MAX_AAL34_PDU; 269 break; 270 default: 271 pr_warning("AAL problems ... (%d)\n", aal); 272 /* fall through */ 273 case ATM_AAL5: 274 max_sdu = ATM_MAX_AAL5_PDU; 275 } 276 if (!tp->max_sdu) 277 tp->max_sdu = max_sdu; 278 else if (tp->max_sdu > max_sdu) 279 return -EINVAL; 280 if (!tp->max_cdv) 281 tp->max_cdv = ATM_MAX_CDV; 282 return 0; 283 } 284 285 static int check_ci(const struct atm_vcc *vcc, short vpi, int vci) 286 { 287 struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)]; 288 struct hlist_node *node; 289 struct sock *s; 290 struct atm_vcc *walk; 291 292 sk_for_each(s, node, head) { 293 walk = atm_sk(s); 294 if (walk->dev != vcc->dev) 295 continue; 296 if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi && 297 walk->vci == vci && ((walk->qos.txtp.traffic_class != 298 ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) || 299 (walk->qos.rxtp.traffic_class != ATM_NONE && 300 vcc->qos.rxtp.traffic_class != ATM_NONE))) 301 return -EADDRINUSE; 302 } 303 304 /* allow VCCs with same VPI/VCI iff they don't collide on 305 TX/RX (but we may refuse such sharing for other reasons, 306 e.g. if protocol requires to have both channels) */ 307 308 return 0; 309 } 310 311 static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci) 312 { 313 static short p; /* poor man's per-device cache */ 314 static int c; 315 short old_p; 316 int old_c; 317 int err; 318 319 if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) { 320 err = check_ci(vcc, *vpi, *vci); 321 return err; 322 } 323 /* last scan may have left values out of bounds for current device */ 324 if (*vpi != ATM_VPI_ANY) 325 p = *vpi; 326 else if (p >= 1 << vcc->dev->ci_range.vpi_bits) 327 p = 0; 328 if (*vci != ATM_VCI_ANY) 329 c = *vci; 330 else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits) 331 c = ATM_NOT_RSV_VCI; 332 old_p = p; 333 old_c = c; 334 do { 335 if (!check_ci(vcc, p, c)) { 336 *vpi = p; 337 *vci = c; 338 return 0; 339 } 340 if (*vci == ATM_VCI_ANY) { 341 c++; 342 if (c >= 1 << vcc->dev->ci_range.vci_bits) 343 c = ATM_NOT_RSV_VCI; 344 } 345 if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) && 346 *vpi == ATM_VPI_ANY) { 347 p++; 348 if (p >= 1 << vcc->dev->ci_range.vpi_bits) 349 p = 0; 350 } 351 } while (old_p != p || old_c != c); 352 return -EADDRINUSE; 353 } 354 355 static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi, 356 int vci) 357 { 358 struct sock *sk = sk_atm(vcc); 359 int error; 360 361 if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY && 362 vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC && 363 vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits)) 364 return -EINVAL; 365 if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE)) 366 return -EPERM; 367 error = -ENODEV; 368 if (!try_module_get(dev->ops->owner)) 369 return error; 370 vcc->dev = dev; 371 write_lock_irq(&vcc_sklist_lock); 372 if (test_bit(ATM_DF_REMOVED, &dev->flags) || 373 (error = find_ci(vcc, &vpi, &vci))) { 374 write_unlock_irq(&vcc_sklist_lock); 375 goto fail_module_put; 376 } 377 vcc->vpi = vpi; 378 vcc->vci = vci; 379 __vcc_insert_socket(sk); 380 write_unlock_irq(&vcc_sklist_lock); 381 switch (vcc->qos.aal) { 382 case ATM_AAL0: 383 error = atm_init_aal0(vcc); 384 vcc->stats = &dev->stats.aal0; 385 break; 386 case ATM_AAL34: 387 error = atm_init_aal34(vcc); 388 vcc->stats = &dev->stats.aal34; 389 break; 390 case ATM_NO_AAL: 391 /* ATM_AAL5 is also used in the "0 for default" case */ 392 vcc->qos.aal = ATM_AAL5; 393 /* fall through */ 394 case ATM_AAL5: 395 error = atm_init_aal5(vcc); 396 vcc->stats = &dev->stats.aal5; 397 break; 398 default: 399 error = -EPROTOTYPE; 400 } 401 if (!error) 402 error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal); 403 if (!error) 404 error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal); 405 if (error) 406 goto fail; 407 pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal); 408 pr_debug(" TX: %d, PCR %d..%d, SDU %d\n", 409 vcc->qos.txtp.traffic_class, 410 vcc->qos.txtp.min_pcr, 411 vcc->qos.txtp.max_pcr, 412 vcc->qos.txtp.max_sdu); 413 pr_debug(" RX: %d, PCR %d..%d, SDU %d\n", 414 vcc->qos.rxtp.traffic_class, 415 vcc->qos.rxtp.min_pcr, 416 vcc->qos.rxtp.max_pcr, 417 vcc->qos.rxtp.max_sdu); 418 419 if (dev->ops->open) { 420 error = dev->ops->open(vcc); 421 if (error) 422 goto fail; 423 } 424 return 0; 425 426 fail: 427 vcc_remove_socket(sk); 428 fail_module_put: 429 module_put(dev->ops->owner); 430 /* ensure we get dev module ref count correct */ 431 vcc->dev = NULL; 432 return error; 433 } 434 435 int vcc_connect(struct socket *sock, int itf, short vpi, int vci) 436 { 437 struct atm_dev *dev; 438 struct atm_vcc *vcc = ATM_SD(sock); 439 int error; 440 441 pr_debug("(vpi %d, vci %d)\n", vpi, vci); 442 if (sock->state == SS_CONNECTED) 443 return -EISCONN; 444 if (sock->state != SS_UNCONNECTED) 445 return -EINVAL; 446 if (!(vpi || vci)) 447 return -EINVAL; 448 449 if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC) 450 clear_bit(ATM_VF_PARTIAL, &vcc->flags); 451 else 452 if (test_bit(ATM_VF_PARTIAL, &vcc->flags)) 453 return -EINVAL; 454 pr_debug("(TX: cl %d,bw %d-%d,sdu %d; " 455 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n", 456 vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr, 457 vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu, 458 vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr, 459 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu, 460 vcc->qos.aal == ATM_AAL5 ? "" : 461 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ", 462 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal); 463 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) 464 return -EBADFD; 465 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS || 466 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) 467 return -EINVAL; 468 if (likely(itf != ATM_ITF_ANY)) { 469 dev = try_then_request_module(atm_dev_lookup(itf), 470 "atm-device-%d", itf); 471 } else { 472 dev = NULL; 473 mutex_lock(&atm_dev_mutex); 474 if (!list_empty(&atm_devs)) { 475 dev = list_entry(atm_devs.next, 476 struct atm_dev, dev_list); 477 atm_dev_hold(dev); 478 } 479 mutex_unlock(&atm_dev_mutex); 480 } 481 if (!dev) 482 return -ENODEV; 483 error = __vcc_connect(vcc, dev, vpi, vci); 484 if (error) { 485 atm_dev_put(dev); 486 return error; 487 } 488 if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC) 489 set_bit(ATM_VF_PARTIAL, &vcc->flags); 490 if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags)) 491 sock->state = SS_CONNECTED; 492 return 0; 493 } 494 495 int vcc_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, 496 size_t size, int flags) 497 { 498 struct sock *sk = sock->sk; 499 struct atm_vcc *vcc; 500 struct sk_buff *skb; 501 int copied, error = -EINVAL; 502 503 if (sock->state != SS_CONNECTED) 504 return -ENOTCONN; 505 if (flags & ~MSG_DONTWAIT) /* only handle MSG_DONTWAIT */ 506 return -EOPNOTSUPP; 507 vcc = ATM_SD(sock); 508 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 509 test_bit(ATM_VF_CLOSE, &vcc->flags) || 510 !test_bit(ATM_VF_READY, &vcc->flags)) 511 return 0; 512 513 skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error); 514 if (!skb) 515 return error; 516 517 copied = skb->len; 518 if (copied > size) { 519 copied = size; 520 msg->msg_flags |= MSG_TRUNC; 521 } 522 523 error = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 524 if (error) 525 return error; 526 sock_recv_ts_and_drops(msg, sk, skb); 527 pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc), skb->truesize); 528 atm_return(vcc, skb->truesize); 529 skb_free_datagram(sk, skb); 530 return copied; 531 } 532 533 int vcc_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 534 size_t total_len) 535 { 536 struct sock *sk = sock->sk; 537 DEFINE_WAIT(wait); 538 struct atm_vcc *vcc; 539 struct sk_buff *skb; 540 int eff, error; 541 const void __user *buff; 542 int size; 543 544 lock_sock(sk); 545 if (sock->state != SS_CONNECTED) { 546 error = -ENOTCONN; 547 goto out; 548 } 549 if (m->msg_name) { 550 error = -EISCONN; 551 goto out; 552 } 553 if (m->msg_iovlen != 1) { 554 error = -ENOSYS; /* fix this later @@@ */ 555 goto out; 556 } 557 buff = m->msg_iov->iov_base; 558 size = m->msg_iov->iov_len; 559 vcc = ATM_SD(sock); 560 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 561 test_bit(ATM_VF_CLOSE, &vcc->flags) || 562 !test_bit(ATM_VF_READY, &vcc->flags)) { 563 error = -EPIPE; 564 send_sig(SIGPIPE, current, 0); 565 goto out; 566 } 567 if (!size) { 568 error = 0; 569 goto out; 570 } 571 if (size < 0 || size > vcc->qos.txtp.max_sdu) { 572 error = -EMSGSIZE; 573 goto out; 574 } 575 576 eff = (size+3) & ~3; /* align to word boundary */ 577 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 578 error = 0; 579 while (!(skb = alloc_tx(vcc, eff))) { 580 if (m->msg_flags & MSG_DONTWAIT) { 581 error = -EAGAIN; 582 break; 583 } 584 schedule(); 585 if (signal_pending(current)) { 586 error = -ERESTARTSYS; 587 break; 588 } 589 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 590 test_bit(ATM_VF_CLOSE, &vcc->flags) || 591 !test_bit(ATM_VF_READY, &vcc->flags)) { 592 error = -EPIPE; 593 send_sig(SIGPIPE, current, 0); 594 break; 595 } 596 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 597 } 598 finish_wait(sk_sleep(sk), &wait); 599 if (error) 600 goto out; 601 skb->dev = NULL; /* for paths shared with net_device interfaces */ 602 ATM_SKB(skb)->atm_options = vcc->atm_options; 603 if (copy_from_user(skb_put(skb, size), buff, size)) { 604 kfree_skb(skb); 605 error = -EFAULT; 606 goto out; 607 } 608 if (eff != size) 609 memset(skb->data + size, 0, eff-size); 610 error = vcc->dev->ops->send(vcc, skb); 611 error = error ? error : size; 612 out: 613 release_sock(sk); 614 return error; 615 } 616 617 unsigned int vcc_poll(struct file *file, struct socket *sock, poll_table *wait) 618 { 619 struct sock *sk = sock->sk; 620 struct atm_vcc *vcc; 621 unsigned int mask; 622 623 sock_poll_wait(file, sk_sleep(sk), wait); 624 mask = 0; 625 626 vcc = ATM_SD(sock); 627 628 /* exceptional events */ 629 if (sk->sk_err) 630 mask = POLLERR; 631 632 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 633 test_bit(ATM_VF_CLOSE, &vcc->flags)) 634 mask |= POLLHUP; 635 636 /* readable? */ 637 if (!skb_queue_empty(&sk->sk_receive_queue)) 638 mask |= POLLIN | POLLRDNORM; 639 640 /* writable? */ 641 if (sock->state == SS_CONNECTING && 642 test_bit(ATM_VF_WAITING, &vcc->flags)) 643 return mask; 644 645 if (vcc->qos.txtp.traffic_class != ATM_NONE && 646 vcc_writable(sk)) 647 mask |= POLLOUT | POLLWRNORM | POLLWRBAND; 648 649 return mask; 650 } 651 652 static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos) 653 { 654 int error; 655 656 /* 657 * Don't let the QoS change the already connected AAL type nor the 658 * traffic class. 659 */ 660 if (qos->aal != vcc->qos.aal || 661 qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class || 662 qos->txtp.traffic_class != vcc->qos.txtp.traffic_class) 663 return -EINVAL; 664 error = adjust_tp(&qos->txtp, qos->aal); 665 if (!error) 666 error = adjust_tp(&qos->rxtp, qos->aal); 667 if (error) 668 return error; 669 if (!vcc->dev->ops->change_qos) 670 return -EOPNOTSUPP; 671 if (sk_atm(vcc)->sk_family == AF_ATMPVC) 672 return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET); 673 return svc_change_qos(vcc, qos); 674 } 675 676 static int check_tp(const struct atm_trafprm *tp) 677 { 678 /* @@@ Should be merged with adjust_tp */ 679 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS) 680 return 0; 681 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr && 682 !tp->max_pcr) 683 return -EINVAL; 684 if (tp->min_pcr == ATM_MAX_PCR) 685 return -EINVAL; 686 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR && 687 tp->min_pcr > tp->max_pcr) 688 return -EINVAL; 689 /* 690 * We allow pcr to be outside [min_pcr,max_pcr], because later 691 * adjustment may still push it in the valid range. 692 */ 693 return 0; 694 } 695 696 static int check_qos(const struct atm_qos *qos) 697 { 698 int error; 699 700 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class) 701 return -EINVAL; 702 if (qos->txtp.traffic_class != qos->rxtp.traffic_class && 703 qos->txtp.traffic_class && qos->rxtp.traffic_class && 704 qos->txtp.traffic_class != ATM_ANYCLASS && 705 qos->rxtp.traffic_class != ATM_ANYCLASS) 706 return -EINVAL; 707 error = check_tp(&qos->txtp); 708 if (error) 709 return error; 710 return check_tp(&qos->rxtp); 711 } 712 713 int vcc_setsockopt(struct socket *sock, int level, int optname, 714 char __user *optval, unsigned int optlen) 715 { 716 struct atm_vcc *vcc; 717 unsigned long value; 718 int error; 719 720 if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname)) 721 return -EINVAL; 722 723 vcc = ATM_SD(sock); 724 switch (optname) { 725 case SO_ATMQOS: 726 { 727 struct atm_qos qos; 728 729 if (copy_from_user(&qos, optval, sizeof(qos))) 730 return -EFAULT; 731 error = check_qos(&qos); 732 if (error) 733 return error; 734 if (sock->state == SS_CONNECTED) 735 return atm_change_qos(vcc, &qos); 736 if (sock->state != SS_UNCONNECTED) 737 return -EBADFD; 738 vcc->qos = qos; 739 set_bit(ATM_VF_HASQOS, &vcc->flags); 740 return 0; 741 } 742 case SO_SETCLP: 743 if (get_user(value, (unsigned long __user *)optval)) 744 return -EFAULT; 745 if (value) 746 vcc->atm_options |= ATM_ATMOPT_CLP; 747 else 748 vcc->atm_options &= ~ATM_ATMOPT_CLP; 749 return 0; 750 default: 751 if (level == SOL_SOCKET) 752 return -EINVAL; 753 break; 754 } 755 if (!vcc->dev || !vcc->dev->ops->setsockopt) 756 return -EINVAL; 757 return vcc->dev->ops->setsockopt(vcc, level, optname, optval, optlen); 758 } 759 760 int vcc_getsockopt(struct socket *sock, int level, int optname, 761 char __user *optval, int __user *optlen) 762 { 763 struct atm_vcc *vcc; 764 int len; 765 766 if (get_user(len, optlen)) 767 return -EFAULT; 768 if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname)) 769 return -EINVAL; 770 771 vcc = ATM_SD(sock); 772 switch (optname) { 773 case SO_ATMQOS: 774 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) 775 return -EINVAL; 776 return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos)) 777 ? -EFAULT : 0; 778 case SO_SETCLP: 779 return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0, 780 (unsigned long __user *)optval) ? -EFAULT : 0; 781 case SO_ATMPVC: 782 { 783 struct sockaddr_atmpvc pvc; 784 785 if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags)) 786 return -ENOTCONN; 787 pvc.sap_family = AF_ATMPVC; 788 pvc.sap_addr.itf = vcc->dev->number; 789 pvc.sap_addr.vpi = vcc->vpi; 790 pvc.sap_addr.vci = vcc->vci; 791 return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0; 792 } 793 default: 794 if (level == SOL_SOCKET) 795 return -EINVAL; 796 break; 797 } 798 if (!vcc->dev || !vcc->dev->ops->getsockopt) 799 return -EINVAL; 800 return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len); 801 } 802 803 int register_atmdevice_notifier(struct notifier_block *nb) 804 { 805 return atomic_notifier_chain_register(&atm_dev_notify_chain, nb); 806 } 807 EXPORT_SYMBOL_GPL(register_atmdevice_notifier); 808 809 void unregister_atmdevice_notifier(struct notifier_block *nb) 810 { 811 atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb); 812 } 813 EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier); 814 815 static int __init atm_init(void) 816 { 817 int error; 818 819 error = proto_register(&vcc_proto, 0); 820 if (error < 0) 821 goto out; 822 error = atmpvc_init(); 823 if (error < 0) { 824 pr_err("atmpvc_init() failed with %d\n", error); 825 goto out_unregister_vcc_proto; 826 } 827 error = atmsvc_init(); 828 if (error < 0) { 829 pr_err("atmsvc_init() failed with %d\n", error); 830 goto out_atmpvc_exit; 831 } 832 error = atm_proc_init(); 833 if (error < 0) { 834 pr_err("atm_proc_init() failed with %d\n", error); 835 goto out_atmsvc_exit; 836 } 837 error = atm_sysfs_init(); 838 if (error < 0) { 839 pr_err("atm_sysfs_init() failed with %d\n", error); 840 goto out_atmproc_exit; 841 } 842 out: 843 return error; 844 out_atmproc_exit: 845 atm_proc_exit(); 846 out_atmsvc_exit: 847 atmsvc_exit(); 848 out_atmpvc_exit: 849 atmsvc_exit(); 850 out_unregister_vcc_proto: 851 proto_unregister(&vcc_proto); 852 goto out; 853 } 854 855 static void __exit atm_exit(void) 856 { 857 atm_proc_exit(); 858 atm_sysfs_exit(); 859 atmsvc_exit(); 860 atmpvc_exit(); 861 proto_unregister(&vcc_proto); 862 } 863 864 subsys_initcall(atm_init); 865 866 module_exit(atm_exit); 867 868 MODULE_LICENSE("GPL"); 869 MODULE_ALIAS_NETPROTO(PF_ATMPVC); 870 MODULE_ALIAS_NETPROTO(PF_ATMSVC); 871