net/atm/common.c

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