1 // SPDX-License-Identifier: GPL-2.0-only 2 /* net/atm/common.c - ATM sockets (common part for PVC and SVC) */ 3 4 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ 7 8 #include <linux/module.h> 9 #include <linux/kmod.h> 10 #include <linux/net.h> /* struct socket, struct proto_ops */ 11 #include <linux/atm.h> /* ATM stuff */ 12 #include <linux/atmdev.h> 13 #include <linux/socket.h> /* SOL_SOCKET */ 14 #include <linux/errno.h> /* error codes */ 15 #include <linux/capability.h> 16 #include <linux/mm.h> 17 #include <linux/sched/signal.h> 18 #include <linux/time64.h> /* 64-bit time for seconds */ 19 #include <linux/skbuff.h> 20 #include <linux/bitops.h> 21 #include <linux/init.h> 22 #include <linux/slab.h> 23 #include <net/sock.h> /* struct sock */ 24 #include <linux/uaccess.h> 25 #include <linux/poll.h> 26 #include <linux/uio.h> 27 28 #include <linux/atomic.h> 29 30 #include "resources.h" /* atm_find_dev */ 31 #include "common.h" /* prototypes */ 32 #include "protocols.h" /* atm_init_<transport> */ 33 #include "addr.h" /* address registry */ 34 #include "signaling.h" /* for WAITING and sigd_attach */ 35 36 struct hlist_head vcc_hash[VCC_HTABLE_SIZE]; 37 EXPORT_SYMBOL(vcc_hash); 38 39 DEFINE_RWLOCK(vcc_sklist_lock); 40 EXPORT_SYMBOL(vcc_sklist_lock); 41 42 static ATOMIC_NOTIFIER_HEAD(atm_dev_notify_chain); 43 44 static void __vcc_insert_socket(struct sock *sk) 45 { 46 struct atm_vcc *vcc = atm_sk(sk); 47 struct hlist_head *head = &vcc_hash[vcc->vci & (VCC_HTABLE_SIZE - 1)]; 48 sk->sk_hash = vcc->vci & (VCC_HTABLE_SIZE - 1); 49 sk_add_node(sk, head); 50 } 51 52 void vcc_insert_socket(struct sock *sk) 53 { 54 write_lock_irq(&vcc_sklist_lock); 55 __vcc_insert_socket(sk); 56 write_unlock_irq(&vcc_sklist_lock); 57 } 58 EXPORT_SYMBOL(vcc_insert_socket); 59 60 static void vcc_remove_socket(struct sock *sk) 61 { 62 write_lock_irq(&vcc_sklist_lock); 63 sk_del_node_init(sk); 64 write_unlock_irq(&vcc_sklist_lock); 65 } 66 67 static bool vcc_tx_ready(struct atm_vcc *vcc, unsigned int size) 68 { 69 struct sock *sk = sk_atm(vcc); 70 71 if (sk_wmem_alloc_get(sk) && !atm_may_send(vcc, size)) { 72 pr_debug("Sorry: wmem_alloc = %d, size = %d, sndbuf = %d\n", 73 sk_wmem_alloc_get(sk), size, sk->sk_sndbuf); 74 return false; 75 } 76 return true; 77 } 78 79 static void vcc_sock_destruct(struct sock *sk) 80 { 81 if (atomic_read(&sk->sk_rmem_alloc)) 82 printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n", 83 __func__, atomic_read(&sk->sk_rmem_alloc)); 84 85 if (refcount_read(&sk->sk_wmem_alloc)) 86 printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n", 87 __func__, refcount_read(&sk->sk_wmem_alloc)); 88 } 89 90 static void vcc_def_wakeup(struct sock *sk) 91 { 92 struct socket_wq *wq; 93 94 rcu_read_lock(); 95 wq = rcu_dereference(sk->sk_wq); 96 if (skwq_has_sleeper(wq)) 97 wake_up(&wq->wait); 98 rcu_read_unlock(); 99 } 100 101 static inline int vcc_writable(struct sock *sk) 102 { 103 struct atm_vcc *vcc = atm_sk(sk); 104 105 return (vcc->qos.txtp.max_sdu + 106 refcount_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf; 107 } 108 109 static void vcc_write_space(struct sock *sk) 110 { 111 struct socket_wq *wq; 112 113 rcu_read_lock(); 114 115 if (vcc_writable(sk)) { 116 wq = rcu_dereference(sk->sk_wq); 117 if (skwq_has_sleeper(wq)) 118 wake_up_interruptible(&wq->wait); 119 120 sk_wake_async_rcu(sk, SOCK_WAKE_SPACE, POLL_OUT); 121 } 122 123 rcu_read_unlock(); 124 } 125 126 static void vcc_release_cb(struct sock *sk) 127 { 128 struct atm_vcc *vcc = atm_sk(sk); 129 130 if (vcc->release_cb) 131 vcc->release_cb(vcc); 132 } 133 134 static struct proto vcc_proto = { 135 .name = "VCC", 136 .owner = THIS_MODULE, 137 .obj_size = sizeof(struct atm_vcc), 138 .release_cb = vcc_release_cb, 139 }; 140 141 int vcc_create(struct net *net, struct socket *sock, int protocol, int family, int kern) 142 { 143 struct sock *sk; 144 struct atm_vcc *vcc; 145 146 sock->sk = NULL; 147 if (sock->type == SOCK_STREAM) 148 return -EINVAL; 149 sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto, kern); 150 if (!sk) 151 return -ENOMEM; 152 sock_init_data(sock, sk); 153 sk->sk_state_change = vcc_def_wakeup; 154 sk->sk_write_space = vcc_write_space; 155 156 vcc = atm_sk(sk); 157 vcc->dev = NULL; 158 memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc)); 159 memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc)); 160 vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */ 161 refcount_set(&sk->sk_wmem_alloc, SK_WMEM_ALLOC_BIAS); 162 atomic_set(&sk->sk_rmem_alloc, 0); 163 vcc->push = NULL; 164 vcc->pop = NULL; 165 vcc->owner = NULL; 166 vcc->push_oam = NULL; 167 vcc->release_cb = NULL; 168 vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */ 169 vcc->atm_options = vcc->aal_options = 0; 170 sk->sk_destruct = vcc_sock_destruct; 171 return 0; 172 } 173 174 static void vcc_destroy_socket(struct sock *sk) 175 { 176 struct atm_vcc *vcc = atm_sk(sk); 177 struct sk_buff *skb; 178 179 set_bit(ATM_VF_CLOSE, &vcc->flags); 180 clear_bit(ATM_VF_READY, &vcc->flags); 181 if (vcc->dev && vcc->dev->ops->close) 182 vcc->dev->ops->close(vcc); 183 if (vcc->push) 184 vcc->push(vcc, NULL); /* atmarpd has no push */ 185 module_put(vcc->owner); 186 187 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { 188 atm_return(vcc, skb->truesize); 189 kfree_skb(skb); 190 } 191 192 if (vcc->dev && vcc->dev->ops->owner) { 193 module_put(vcc->dev->ops->owner); 194 atm_dev_put(vcc->dev); 195 } 196 197 vcc_remove_socket(sk); 198 } 199 200 int vcc_release(struct socket *sock) 201 { 202 struct sock *sk = sock->sk; 203 204 if (sk) { 205 lock_sock(sk); 206 vcc_destroy_socket(sock->sk); 207 release_sock(sk); 208 sock_put(sk); 209 } 210 211 return 0; 212 } 213 214 void vcc_release_async(struct atm_vcc *vcc, int reply) 215 { 216 struct sock *sk = sk_atm(vcc); 217 218 set_bit(ATM_VF_CLOSE, &vcc->flags); 219 sk->sk_shutdown |= RCV_SHUTDOWN; 220 sk->sk_err = -reply; 221 clear_bit(ATM_VF_WAITING, &vcc->flags); 222 sk->sk_state_change(sk); 223 } 224 EXPORT_SYMBOL(vcc_release_async); 225 226 void vcc_process_recv_queue(struct atm_vcc *vcc) 227 { 228 struct sk_buff_head queue, *rq; 229 struct sk_buff *skb, *tmp; 230 unsigned long flags; 231 232 __skb_queue_head_init(&queue); 233 rq = &sk_atm(vcc)->sk_receive_queue; 234 235 spin_lock_irqsave(&rq->lock, flags); 236 skb_queue_splice_init(rq, &queue); 237 spin_unlock_irqrestore(&rq->lock, flags); 238 239 skb_queue_walk_safe(&queue, skb, tmp) { 240 __skb_unlink(skb, &queue); 241 vcc->push(vcc, skb); 242 } 243 } 244 EXPORT_SYMBOL(vcc_process_recv_queue); 245 246 void atm_dev_signal_change(struct atm_dev *dev, char signal) 247 { 248 pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n", 249 __func__, signal, dev, dev->number, dev->signal); 250 251 /* atm driver sending invalid signal */ 252 WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND); 253 254 if (dev->signal == signal) 255 return; /* no change */ 256 257 dev->signal = signal; 258 259 atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev); 260 } 261 EXPORT_SYMBOL(atm_dev_signal_change); 262 263 void atm_dev_release_vccs(struct atm_dev *dev) 264 { 265 int i; 266 267 write_lock_irq(&vcc_sklist_lock); 268 for (i = 0; i < VCC_HTABLE_SIZE; i++) { 269 struct hlist_head *head = &vcc_hash[i]; 270 struct hlist_node *tmp; 271 struct sock *s; 272 struct atm_vcc *vcc; 273 274 sk_for_each_safe(s, tmp, head) { 275 vcc = atm_sk(s); 276 if (vcc->dev == dev) { 277 vcc_release_async(vcc, -EPIPE); 278 sk_del_node_init(s); 279 } 280 } 281 } 282 write_unlock_irq(&vcc_sklist_lock); 283 } 284 EXPORT_SYMBOL(atm_dev_release_vccs); 285 286 static int adjust_tp(struct atm_trafprm *tp, unsigned char aal) 287 { 288 int max_sdu; 289 290 if (!tp->traffic_class) 291 return 0; 292 switch (aal) { 293 case ATM_AAL0: 294 max_sdu = ATM_CELL_SIZE-1; 295 break; 296 case ATM_AAL34: 297 max_sdu = ATM_MAX_AAL34_PDU; 298 break; 299 default: 300 pr_warn("AAL problems ... (%d)\n", aal); 301 fallthrough; 302 case ATM_AAL5: 303 max_sdu = ATM_MAX_AAL5_PDU; 304 } 305 if (!tp->max_sdu) 306 tp->max_sdu = max_sdu; 307 else if (tp->max_sdu > max_sdu) 308 return -EINVAL; 309 if (!tp->max_cdv) 310 tp->max_cdv = ATM_MAX_CDV; 311 return 0; 312 } 313 314 static int check_ci(const struct atm_vcc *vcc, short vpi, int vci) 315 { 316 struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)]; 317 struct sock *s; 318 struct atm_vcc *walk; 319 320 sk_for_each(s, head) { 321 walk = atm_sk(s); 322 if (walk->dev != vcc->dev) 323 continue; 324 if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi && 325 walk->vci == vci && ((walk->qos.txtp.traffic_class != 326 ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) || 327 (walk->qos.rxtp.traffic_class != ATM_NONE && 328 vcc->qos.rxtp.traffic_class != ATM_NONE))) 329 return -EADDRINUSE; 330 } 331 332 /* allow VCCs with same VPI/VCI iff they don't collide on 333 TX/RX (but we may refuse such sharing for other reasons, 334 e.g. if protocol requires to have both channels) */ 335 336 return 0; 337 } 338 339 static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci) 340 { 341 static short p; /* poor man's per-device cache */ 342 static int c; 343 short old_p; 344 int old_c; 345 int err; 346 347 if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) { 348 err = check_ci(vcc, *vpi, *vci); 349 return err; 350 } 351 /* last scan may have left values out of bounds for current device */ 352 if (*vpi != ATM_VPI_ANY) 353 p = *vpi; 354 else if (p >= 1 << vcc->dev->ci_range.vpi_bits) 355 p = 0; 356 if (*vci != ATM_VCI_ANY) 357 c = *vci; 358 else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits) 359 c = ATM_NOT_RSV_VCI; 360 old_p = p; 361 old_c = c; 362 do { 363 if (!check_ci(vcc, p, c)) { 364 *vpi = p; 365 *vci = c; 366 return 0; 367 } 368 if (*vci == ATM_VCI_ANY) { 369 c++; 370 if (c >= 1 << vcc->dev->ci_range.vci_bits) 371 c = ATM_NOT_RSV_VCI; 372 } 373 if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) && 374 *vpi == ATM_VPI_ANY) { 375 p++; 376 if (p >= 1 << vcc->dev->ci_range.vpi_bits) 377 p = 0; 378 } 379 } while (old_p != p || old_c != c); 380 return -EADDRINUSE; 381 } 382 383 static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi, 384 int vci) 385 { 386 struct sock *sk = sk_atm(vcc); 387 int error; 388 389 if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY && 390 vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC && 391 vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits)) 392 return -EINVAL; 393 if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE)) 394 return -EPERM; 395 error = -ENODEV; 396 if (!try_module_get(dev->ops->owner)) 397 return error; 398 vcc->dev = dev; 399 write_lock_irq(&vcc_sklist_lock); 400 if (test_bit(ATM_DF_REMOVED, &dev->flags) || 401 (error = find_ci(vcc, &vpi, &vci))) { 402 write_unlock_irq(&vcc_sklist_lock); 403 goto fail_module_put; 404 } 405 vcc->vpi = vpi; 406 vcc->vci = vci; 407 __vcc_insert_socket(sk); 408 write_unlock_irq(&vcc_sklist_lock); 409 switch (vcc->qos.aal) { 410 case ATM_AAL0: 411 error = atm_init_aal0(vcc); 412 vcc->stats = &dev->stats.aal0; 413 break; 414 case ATM_AAL34: 415 error = atm_init_aal34(vcc); 416 vcc->stats = &dev->stats.aal34; 417 break; 418 case ATM_NO_AAL: 419 /* ATM_AAL5 is also used in the "0 for default" case */ 420 vcc->qos.aal = ATM_AAL5; 421 fallthrough; 422 case ATM_AAL5: 423 error = atm_init_aal5(vcc); 424 vcc->stats = &dev->stats.aal5; 425 break; 426 default: 427 error = -EPROTOTYPE; 428 } 429 if (!error) 430 error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal); 431 if (!error) 432 error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal); 433 if (error) 434 goto fail; 435 pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal); 436 pr_debug(" TX: %d, PCR %d..%d, SDU %d\n", 437 vcc->qos.txtp.traffic_class, 438 vcc->qos.txtp.min_pcr, 439 vcc->qos.txtp.max_pcr, 440 vcc->qos.txtp.max_sdu); 441 pr_debug(" RX: %d, PCR %d..%d, SDU %d\n", 442 vcc->qos.rxtp.traffic_class, 443 vcc->qos.rxtp.min_pcr, 444 vcc->qos.rxtp.max_pcr, 445 vcc->qos.rxtp.max_sdu); 446 447 if (dev->ops->open) { 448 error = dev->ops->open(vcc); 449 if (error) 450 goto fail; 451 } 452 return 0; 453 454 fail: 455 vcc_remove_socket(sk); 456 fail_module_put: 457 module_put(dev->ops->owner); 458 /* ensure we get dev module ref count correct */ 459 vcc->dev = NULL; 460 return error; 461 } 462 463 int vcc_connect(struct socket *sock, int itf, short vpi, int vci) 464 { 465 struct atm_dev *dev; 466 struct atm_vcc *vcc = ATM_SD(sock); 467 int error; 468 469 pr_debug("(vpi %d, vci %d)\n", vpi, vci); 470 if (sock->state == SS_CONNECTED) 471 return -EISCONN; 472 if (sock->state != SS_UNCONNECTED) 473 return -EINVAL; 474 if (!(vpi || vci)) 475 return -EINVAL; 476 477 if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC) 478 clear_bit(ATM_VF_PARTIAL, &vcc->flags); 479 else 480 if (test_bit(ATM_VF_PARTIAL, &vcc->flags)) 481 return -EINVAL; 482 pr_debug("(TX: cl %d,bw %d-%d,sdu %d; " 483 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n", 484 vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr, 485 vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu, 486 vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr, 487 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu, 488 vcc->qos.aal == ATM_AAL5 ? "" : 489 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ", 490 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal); 491 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) 492 return -EBADFD; 493 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS || 494 vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) 495 return -EINVAL; 496 if (likely(itf != ATM_ITF_ANY)) { 497 dev = try_then_request_module(atm_dev_lookup(itf), 498 "atm-device-%d", itf); 499 } else { 500 dev = NULL; 501 mutex_lock(&atm_dev_mutex); 502 if (!list_empty(&atm_devs)) { 503 dev = list_entry(atm_devs.next, 504 struct atm_dev, dev_list); 505 atm_dev_hold(dev); 506 } 507 mutex_unlock(&atm_dev_mutex); 508 } 509 if (!dev) 510 return -ENODEV; 511 error = __vcc_connect(vcc, dev, vpi, vci); 512 if (error) { 513 atm_dev_put(dev); 514 return error; 515 } 516 if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC) 517 set_bit(ATM_VF_PARTIAL, &vcc->flags); 518 if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags)) 519 sock->state = SS_CONNECTED; 520 return 0; 521 } 522 523 int vcc_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, 524 int flags) 525 { 526 struct sock *sk = sock->sk; 527 struct atm_vcc *vcc; 528 struct sk_buff *skb; 529 int copied, error = -EINVAL; 530 531 if (sock->state != SS_CONNECTED) 532 return -ENOTCONN; 533 534 /* only handle MSG_DONTWAIT and MSG_PEEK */ 535 if (flags & ~(MSG_DONTWAIT | MSG_PEEK)) 536 return -EOPNOTSUPP; 537 538 vcc = ATM_SD(sock); 539 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 540 test_bit(ATM_VF_CLOSE, &vcc->flags) || 541 !test_bit(ATM_VF_READY, &vcc->flags)) 542 return 0; 543 544 skb = skb_recv_datagram(sk, flags, &error); 545 if (!skb) 546 return error; 547 548 copied = skb->len; 549 if (copied > size) { 550 copied = size; 551 msg->msg_flags |= MSG_TRUNC; 552 } 553 554 error = skb_copy_datagram_msg(skb, 0, msg, copied); 555 if (error) 556 return error; 557 sock_recv_cmsgs(msg, sk, skb); 558 559 if (!(flags & MSG_PEEK)) { 560 pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc), 561 skb->truesize); 562 atm_return(vcc, skb->truesize); 563 } 564 565 skb_free_datagram(sk, skb); 566 return copied; 567 } 568 569 int vcc_sendmsg(struct socket *sock, struct msghdr *m, size_t size) 570 { 571 struct sock *sk = sock->sk; 572 DEFINE_WAIT(wait); 573 struct atm_vcc *vcc; 574 struct sk_buff *skb; 575 int eff, error; 576 577 lock_sock(sk); 578 if (sock->state != SS_CONNECTED) { 579 error = -ENOTCONN; 580 goto out; 581 } 582 if (m->msg_name) { 583 error = -EISCONN; 584 goto out; 585 } 586 vcc = ATM_SD(sock); 587 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 588 test_bit(ATM_VF_CLOSE, &vcc->flags) || 589 !test_bit(ATM_VF_READY, &vcc->flags)) { 590 error = -EPIPE; 591 send_sig(SIGPIPE, current, 0); 592 goto out; 593 } 594 if (!size) { 595 error = 0; 596 goto out; 597 } 598 if (size > vcc->qos.txtp.max_sdu) { 599 error = -EMSGSIZE; 600 goto out; 601 } 602 603 eff = (size+3) & ~3; /* align to word boundary */ 604 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 605 error = 0; 606 while (!vcc_tx_ready(vcc, eff)) { 607 if (m->msg_flags & MSG_DONTWAIT) { 608 error = -EAGAIN; 609 break; 610 } 611 schedule(); 612 if (signal_pending(current)) { 613 error = -ERESTARTSYS; 614 break; 615 } 616 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 617 test_bit(ATM_VF_CLOSE, &vcc->flags) || 618 !test_bit(ATM_VF_READY, &vcc->flags)) { 619 error = -EPIPE; 620 send_sig(SIGPIPE, current, 0); 621 break; 622 } 623 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 624 } 625 finish_wait(sk_sleep(sk), &wait); 626 if (error) 627 goto out; 628 629 skb = alloc_skb(eff, GFP_KERNEL); 630 if (!skb) { 631 error = -ENOMEM; 632 goto out; 633 } 634 pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize); 635 atm_account_tx(vcc, skb); 636 637 skb->dev = NULL; /* for paths shared with net_device interfaces */ 638 if (!copy_from_iter_full(skb_put(skb, size), size, &m->msg_iter)) { 639 error = -EFAULT; 640 goto free_skb; 641 } 642 if (eff != size) 643 memset(skb->data + size, 0, eff-size); 644 645 if (vcc->dev->ops->pre_send) { 646 error = vcc->dev->ops->pre_send(vcc, skb); 647 if (error) 648 goto free_skb; 649 } 650 651 error = vcc->dev->ops->send(vcc, skb); 652 error = error ? error : size; 653 out: 654 release_sock(sk); 655 return error; 656 free_skb: 657 atm_return_tx(vcc, skb); 658 kfree_skb(skb); 659 goto out; 660 } 661 662 __poll_t vcc_poll(struct file *file, struct socket *sock, poll_table *wait) 663 { 664 struct sock *sk = sock->sk; 665 struct atm_vcc *vcc; 666 __poll_t mask; 667 668 sock_poll_wait(file, sock, wait); 669 mask = 0; 670 671 vcc = ATM_SD(sock); 672 673 /* exceptional events */ 674 if (sk->sk_err) 675 mask = EPOLLERR; 676 677 if (test_bit(ATM_VF_RELEASED, &vcc->flags) || 678 test_bit(ATM_VF_CLOSE, &vcc->flags)) 679 mask |= EPOLLHUP; 680 681 /* readable? */ 682 if (!skb_queue_empty_lockless(&sk->sk_receive_queue)) 683 mask |= EPOLLIN | EPOLLRDNORM; 684 685 /* writable? */ 686 if (sock->state == SS_CONNECTING && 687 test_bit(ATM_VF_WAITING, &vcc->flags)) 688 return mask; 689 690 if (vcc->qos.txtp.traffic_class != ATM_NONE && 691 vcc_writable(sk)) 692 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; 693 694 return mask; 695 } 696 697 static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos) 698 { 699 int error; 700 701 /* 702 * Don't let the QoS change the already connected AAL type nor the 703 * traffic class. 704 */ 705 if (qos->aal != vcc->qos.aal || 706 qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class || 707 qos->txtp.traffic_class != vcc->qos.txtp.traffic_class) 708 return -EINVAL; 709 error = adjust_tp(&qos->txtp, qos->aal); 710 if (!error) 711 error = adjust_tp(&qos->rxtp, qos->aal); 712 if (error) 713 return error; 714 if (!vcc->dev->ops->change_qos) 715 return -EOPNOTSUPP; 716 if (sk_atm(vcc)->sk_family == AF_ATMPVC) 717 return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET); 718 return svc_change_qos(vcc, qos); 719 } 720 721 static int check_tp(const struct atm_trafprm *tp) 722 { 723 /* @@@ Should be merged with adjust_tp */ 724 if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS) 725 return 0; 726 if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr && 727 !tp->max_pcr) 728 return -EINVAL; 729 if (tp->min_pcr == ATM_MAX_PCR) 730 return -EINVAL; 731 if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR && 732 tp->min_pcr > tp->max_pcr) 733 return -EINVAL; 734 /* 735 * We allow pcr to be outside [min_pcr,max_pcr], because later 736 * adjustment may still push it in the valid range. 737 */ 738 return 0; 739 } 740 741 static int check_qos(const struct atm_qos *qos) 742 { 743 int error; 744 745 if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class) 746 return -EINVAL; 747 if (qos->txtp.traffic_class != qos->rxtp.traffic_class && 748 qos->txtp.traffic_class && qos->rxtp.traffic_class && 749 qos->txtp.traffic_class != ATM_ANYCLASS && 750 qos->rxtp.traffic_class != ATM_ANYCLASS) 751 return -EINVAL; 752 error = check_tp(&qos->txtp); 753 if (error) 754 return error; 755 return check_tp(&qos->rxtp); 756 } 757 758 int vcc_setsockopt(struct socket *sock, int level, int optname, 759 sockptr_t optval, unsigned int optlen) 760 { 761 struct atm_vcc *vcc; 762 unsigned long value; 763 int error; 764 765 if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname)) 766 return -EINVAL; 767 768 vcc = ATM_SD(sock); 769 switch (optname) { 770 case SO_ATMQOS: 771 { 772 struct atm_qos qos; 773 774 if (copy_from_sockptr(&qos, optval, sizeof(qos))) 775 return -EFAULT; 776 error = check_qos(&qos); 777 if (error) 778 return error; 779 if (sock->state == SS_CONNECTED) 780 return atm_change_qos(vcc, &qos); 781 if (sock->state != SS_UNCONNECTED) 782 return -EBADFD; 783 vcc->qos = qos; 784 set_bit(ATM_VF_HASQOS, &vcc->flags); 785 return 0; 786 } 787 case SO_SETCLP: 788 if (copy_from_sockptr(&value, optval, sizeof(value))) 789 return -EFAULT; 790 if (value) 791 vcc->atm_options |= ATM_ATMOPT_CLP; 792 else 793 vcc->atm_options &= ~ATM_ATMOPT_CLP; 794 return 0; 795 default: 796 return -EINVAL; 797 } 798 } 799 800 int vcc_getsockopt(struct socket *sock, int level, int optname, 801 sockopt_t *opt) 802 { 803 struct atm_vcc *vcc; 804 int val; 805 int len; 806 807 len = opt->optlen; 808 if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname)) 809 return -EINVAL; 810 811 vcc = ATM_SD(sock); 812 switch (optname) { 813 case SO_ATMQOS: 814 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) 815 return -EINVAL; 816 return copy_to_iter(&vcc->qos, sizeof(vcc->qos), 817 &opt->iter_out) != sizeof(vcc->qos) 818 ? -EFAULT : 0; 819 case SO_SETCLP: 820 val = vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0; 821 return copy_to_iter(&val, sizeof(val), &opt->iter_out) != 822 sizeof(val) ? -EFAULT : 0; 823 case SO_ATMPVC: 824 { 825 struct sockaddr_atmpvc pvc; 826 827 if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags)) 828 return -ENOTCONN; 829 memset(&pvc, 0, sizeof(pvc)); 830 pvc.sap_family = AF_ATMPVC; 831 pvc.sap_addr.itf = vcc->dev->number; 832 pvc.sap_addr.vpi = vcc->vpi; 833 pvc.sap_addr.vci = vcc->vci; 834 return copy_to_iter(&pvc, sizeof(pvc), &opt->iter_out) != 835 sizeof(pvc) ? -EFAULT : 0; 836 } 837 default: 838 return -EINVAL; 839 } 840 } 841 842 int register_atmdevice_notifier(struct notifier_block *nb) 843 { 844 return atomic_notifier_chain_register(&atm_dev_notify_chain, nb); 845 } 846 EXPORT_SYMBOL_GPL(register_atmdevice_notifier); 847 848 void unregister_atmdevice_notifier(struct notifier_block *nb) 849 { 850 atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb); 851 } 852 EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier); 853 854 static int __init atm_init(void) 855 { 856 int error; 857 858 error = proto_register(&vcc_proto, 0); 859 if (error < 0) 860 goto out; 861 error = atmpvc_init(); 862 if (error < 0) { 863 pr_err("atmpvc_init() failed with %d\n", error); 864 goto out_unregister_vcc_proto; 865 } 866 error = atmsvc_init(); 867 if (error < 0) { 868 pr_err("atmsvc_init() failed with %d\n", error); 869 goto out_atmpvc_exit; 870 } 871 error = atm_proc_init(); 872 if (error < 0) { 873 pr_err("atm_proc_init() failed with %d\n", error); 874 goto out_atmsvc_exit; 875 } 876 error = atm_sysfs_init(); 877 if (error < 0) { 878 pr_err("atm_sysfs_init() failed with %d\n", error); 879 goto out_atmproc_exit; 880 } 881 out: 882 return error; 883 out_atmproc_exit: 884 atm_proc_exit(); 885 out_atmsvc_exit: 886 atmsvc_exit(); 887 out_atmpvc_exit: 888 atmpvc_exit(); 889 out_unregister_vcc_proto: 890 proto_unregister(&vcc_proto); 891 goto out; 892 } 893 894 static void __exit atm_exit(void) 895 { 896 atm_proc_exit(); 897 atm_sysfs_exit(); 898 atmsvc_exit(); 899 atmpvc_exit(); 900 proto_unregister(&vcc_proto); 901 } 902 903 subsys_initcall(atm_init); 904 905 module_exit(atm_exit); 906 907 MODULE_DESCRIPTION("Asynchronous Transfer Mode (ATM) networking core"); 908 MODULE_LICENSE("GPL"); 909 MODULE_ALIAS_NETPROTO(PF_ATMPVC); 910 MODULE_ALIAS_NETPROTO(PF_ATMSVC); 911