drivers/staging/lustre/lustre/libcfs/linux/linux-tcpip.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36 #define DEBUG_SUBSYSTEM S_LNET
  37
  38 #include "../../../include/linux/libcfs/libcfs.h"
  39
  40 #include <linux/if.h>
  41 #include <linux/in.h>
  42 #include <linux/file.h>
  43 /* For sys_open & sys_close */
  44 #include <linux/syscalls.h>
  45
  46 int
  47 libcfs_sock_ioctl(int cmd, unsigned long arg)
  48 {
  49         mm_segment_t    oldmm = get_fs();
  50         struct socket  *sock;
  51         int             rc;
  52         struct file    *sock_filp;
  53
  54         rc = sock_create (PF_INET, SOCK_STREAM, 0, &sock);
  55         if (rc != 0) {
  56                 CERROR ("Can't create socket: %d\n", rc);
  57                 return rc;
  58         }
  59
  60         sock_filp = sock_alloc_file(sock, 0, NULL);
  61         if (IS_ERR(sock_filp)) {
  62                 sock_release(sock);
  63                 rc = PTR_ERR(sock_filp);
  64                 goto out;
  65         }
  66
  67         set_fs(KERNEL_DS);
  68         if (sock_filp->f_op->unlocked_ioctl)
  69                 rc = sock_filp->f_op->unlocked_ioctl(sock_filp, cmd, arg);
  70         set_fs(oldmm);
  71
  72         fput(sock_filp);
  73 out:
  74         return rc;
  75 }
  76
  77 int
  78 libcfs_ipif_query (char *name, int *up, __u32 *ip, __u32 *mask)
  79 {
  80         struct ifreq   ifr;
  81         int         nob;
  82         int         rc;
  83         __u32     val;
  84
  85         nob = strnlen(name, IFNAMSIZ);
  86         if (nob == IFNAMSIZ) {
  87                 CERROR("Interface name %s too long\n", name);
  88                 return -EINVAL;
  89         }
  90
  91         CLASSERT (sizeof(ifr.ifr_name) >= IFNAMSIZ);
  92
  93         strcpy(ifr.ifr_name, name);
  94         rc = libcfs_sock_ioctl(SIOCGIFFLAGS, (unsigned long)&ifr);
  95
  96         if (rc != 0) {
  97                 CERROR("Can't get flags for interface %s\n", name);
  98                 return rc;
  99         }
 100
 101         if ((ifr.ifr_flags & IFF_UP) == 0) {
 102                 CDEBUG(D_NET, "Interface %s down\n", name);
 103                 *up = 0;
 104                 *ip = *mask = 0;
 105                 return 0;
 106         }
 107
 108         *up = 1;
 109
 110         strcpy(ifr.ifr_name, name);
 111         ifr.ifr_addr.sa_family = AF_INET;
 112         rc = libcfs_sock_ioctl(SIOCGIFADDR, (unsigned long)&ifr);
 113
 114         if (rc != 0) {
 115                 CERROR("Can't get IP address for interface %s\n", name);
 116                 return rc;
 117         }
 118
 119         val = ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr;
 120         *ip = ntohl(val);
 121
 122         strcpy(ifr.ifr_name, name);
 123         ifr.ifr_addr.sa_family = AF_INET;
 124         rc = libcfs_sock_ioctl(SIOCGIFNETMASK, (unsigned long)&ifr);
 125
 126         if (rc != 0) {
 127                 CERROR("Can't get netmask for interface %s\n", name);
 128                 return rc;
 129         }
 130
 131         val = ((struct sockaddr_in *)&ifr.ifr_netmask)->sin_addr.s_addr;
 132         *mask = ntohl(val);
 133
 134         return 0;
 135 }
 136
 137 EXPORT_SYMBOL(libcfs_ipif_query);
 138
 139 int
 140 libcfs_ipif_enumerate (char ***namesp)
 141 {
 142         /* Allocate and fill in 'names', returning # interfaces/error */
 143         char       **names;
 144         int          toobig;
 145         int          nalloc;
 146         int          nfound;
 147         struct ifreq   *ifr;
 148         struct ifconf   ifc;
 149         int          rc;
 150         int          nob;
 151         int          i;
 152
 153
 154         nalloc = 16;    /* first guess at max interfaces */
 155         toobig = 0;
 156         for (;;) {
 157                 if (nalloc * sizeof(*ifr) > PAGE_CACHE_SIZE) {
 158                         toobig = 1;
 159                         nalloc = PAGE_CACHE_SIZE/sizeof(*ifr);
 160                         CWARN("Too many interfaces: only enumerating first %d\n",
 161                               nalloc);
 162                 }
 163
 164                 LIBCFS_ALLOC(ifr, nalloc * sizeof(*ifr));
 165                 if (ifr == NULL) {
 166                         CERROR ("ENOMEM enumerating up to %d interfaces\n", nalloc);
 167                         rc = -ENOMEM;
 168                         goto out0;
 169                 }
 170
 171                 ifc.ifc_buf = (char *)ifr;
 172                 ifc.ifc_len = nalloc * sizeof(*ifr);
 173
 174                 rc = libcfs_sock_ioctl(SIOCGIFCONF, (unsigned long)&ifc);
 175
 176                 if (rc < 0) {
 177                         CERROR ("Error %d enumerating interfaces\n", rc);
 178                         goto out1;
 179                 }
 180
 181                 LASSERT (rc == 0);
 182
 183                 nfound = ifc.ifc_len/sizeof(*ifr);
 184                 LASSERT (nfound <= nalloc);
 185
 186                 if (nfound < nalloc || toobig)
 187                         break;
 188
 189                 LIBCFS_FREE(ifr, nalloc * sizeof(*ifr));
 190                 nalloc *= 2;
 191         }
 192
 193         if (nfound == 0)
 194                 goto out1;
 195
 196         LIBCFS_ALLOC(names, nfound * sizeof(*names));
 197         if (names == NULL) {
 198                 rc = -ENOMEM;
 199                 goto out1;
 200         }
 201
 202         for (i = 0; i < nfound; i++) {
 203
 204                 nob = strnlen (ifr[i].ifr_name, IFNAMSIZ);
 205                 if (nob == IFNAMSIZ) {
 206                         /* no space for terminating NULL */
 207                         CERROR("interface name %.*s too long (%d max)\n",
 208                                nob, ifr[i].ifr_name, IFNAMSIZ);
 209                         rc = -ENAMETOOLONG;
 210                         goto out2;
 211                 }
 212
 213                 LIBCFS_ALLOC(names[i], IFNAMSIZ);
 214                 if (names[i] == NULL) {
 215                         rc = -ENOMEM;
 216                         goto out2;
 217                 }
 218
 219                 memcpy(names[i], ifr[i].ifr_name, nob);
 220                 names[i][nob] = 0;
 221         }
 222
 223         *namesp = names;
 224         rc = nfound;
 225
 226  out2:
 227         if (rc < 0)
 228                 libcfs_ipif_free_enumeration(names, nfound);
 229  out1:
 230         LIBCFS_FREE(ifr, nalloc * sizeof(*ifr));
 231  out0:
 232         return rc;
 233 }
 234
 235 EXPORT_SYMBOL(libcfs_ipif_enumerate);
 236
 237 void
 238 libcfs_ipif_free_enumeration (char **names, int n)
 239 {
 240         int      i;
 241
 242         LASSERT (n > 0);
 243
 244         for (i = 0; i < n && names[i] != NULL; i++)
 245                 LIBCFS_FREE(names[i], IFNAMSIZ);
 246
 247         LIBCFS_FREE(names, n * sizeof(*names));
 248 }
 249
 250 EXPORT_SYMBOL(libcfs_ipif_free_enumeration);
 251
 252 int
 253 libcfs_sock_write (struct socket *sock, void *buffer, int nob, int timeout)
 254 {
 255         int         rc;
 256         long       ticks = timeout * HZ;
 257         unsigned long  then;
 258         struct timeval tv;
 259
 260         LASSERT (nob > 0);
 261         /* Caller may pass a zero timeout if she thinks the socket buffer is
 262          * empty enough to take the whole message immediately */
 263
 264         for (;;) {
 265                 struct kvec  iov = {
 266                         .iov_base = buffer,
 267                         .iov_len  = nob
 268                 };
 269                 struct msghdr msg = {
 270                         .msg_flags      = (timeout == 0) ? MSG_DONTWAIT : 0
 271                 };
 272
 273                 if (timeout != 0) {
 274                         /* Set send timeout to remaining time */
 275                         tv = (struct timeval) {
 276                                 .tv_sec = ticks / HZ,
 277                                 .tv_usec = ((ticks % HZ) * 1000000) / HZ
 278                         };
 279                         rc = kernel_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO,
 280                                              (char *)&tv, sizeof(tv));
 281                         if (rc != 0) {
 282                                 CERROR("Can't set socket send timeout "
 283                                        "%ld.%06d: %d\n",
 284                                        (long)tv.tv_sec, (int)tv.tv_usec, rc);
 285                                 return rc;
 286                         }
 287                 }
 288
 289                 then = jiffies;
 290                 rc = kernel_sendmsg(sock, &msg, &iov, 1, nob);
 291                 ticks -= jiffies - then;
 292
 293                 if (rc == nob)
 294                         return 0;
 295
 296                 if (rc < 0)
 297                         return rc;
 298
 299                 if (rc == 0) {
 300                         CERROR ("Unexpected zero rc\n");
 301                         return (-ECONNABORTED);
 302                 }
 303
 304                 if (ticks <= 0)
 305                         return -EAGAIN;
 306
 307                 buffer = ((char *)buffer) + rc;
 308                 nob -= rc;
 309         }
 310
 311         return (0);
 312 }
 313 EXPORT_SYMBOL(libcfs_sock_write);
 314
 315 int
 316 libcfs_sock_read (struct socket *sock, void *buffer, int nob, int timeout)
 317 {
 318         int         rc;
 319         long       ticks = timeout * HZ;
 320         unsigned long  then;
 321         struct timeval tv;
 322
 323         LASSERT (nob > 0);
 324         LASSERT (ticks > 0);
 325
 326         for (;;) {
 327                 struct kvec  iov = {
 328                         .iov_base = buffer,
 329                         .iov_len  = nob
 330                 };
 331                 struct msghdr msg = {
 332                         .msg_flags      = 0
 333                 };
 334
 335                 /* Set receive timeout to remaining time */
 336                 tv = (struct timeval) {
 337                         .tv_sec = ticks / HZ,
 338                         .tv_usec = ((ticks % HZ) * 1000000) / HZ
 339                 };
 340                 rc = kernel_setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO,
 341                                      (char *)&tv, sizeof(tv));
 342                 if (rc != 0) {
 343                         CERROR("Can't set socket recv timeout %ld.%06d: %d\n",
 344                                (long)tv.tv_sec, (int)tv.tv_usec, rc);
 345                         return rc;
 346                 }
 347
 348                 then = jiffies;
 349                 rc = kernel_recvmsg(sock, &msg, &iov, 1, nob, 0);
 350                 ticks -= jiffies - then;
 351
 352                 if (rc < 0)
 353                         return rc;
 354
 355                 if (rc == 0)
 356                         return -ECONNRESET;
 357
 358                 buffer = ((char *)buffer) + rc;
 359                 nob -= rc;
 360
 361                 if (nob == 0)
 362                         return 0;
 363
 364                 if (ticks <= 0)
 365                         return -ETIMEDOUT;
 366         }
 367 }
 368
 369 EXPORT_SYMBOL(libcfs_sock_read);
 370
 371 static int
 372 libcfs_sock_create (struct socket **sockp, int *fatal,
 373                     __u32 local_ip, int local_port)
 374 {
 375         struct sockaddr_in  locaddr;
 376         struct socket      *sock;
 377         int              rc;
 378         int              option;
 379
 380         /* All errors are fatal except bind failure if the port is in use */
 381         *fatal = 1;
 382
 383         rc = sock_create (PF_INET, SOCK_STREAM, 0, &sock);
 384         *sockp = sock;
 385         if (rc != 0) {
 386                 CERROR ("Can't create socket: %d\n", rc);
 387                 return (rc);
 388         }
 389
 390         option = 1;
 391         rc = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 392                              (char *)&option, sizeof (option));
 393         if (rc != 0) {
 394                 CERROR("Can't set SO_REUSEADDR for socket: %d\n", rc);
 395                 goto failed;
 396         }
 397
 398         if (local_ip != 0 || local_port != 0) {
 399                 memset(&locaddr, 0, sizeof(locaddr));
 400                 locaddr.sin_family = AF_INET;
 401                 locaddr.sin_port = htons(local_port);
 402                 locaddr.sin_addr.s_addr = (local_ip == 0) ?
 403                                           INADDR_ANY : htonl(local_ip);
 404
 405                 rc = sock->ops->bind(sock, (struct sockaddr *)&locaddr,
 406                                      sizeof(locaddr));
 407                 if (rc == -EADDRINUSE) {
 408                         CDEBUG(D_NET, "Port %d already in use\n", local_port);
 409                         *fatal = 0;
 410                         goto failed;
 411                 }
 412                 if (rc != 0) {
 413                         CERROR("Error trying to bind to port %d: %d\n",
 414                                local_port, rc);
 415                         goto failed;
 416                 }
 417         }
 418
 419         return 0;
 420
 421  failed:
 422         sock_release(sock);
 423         return rc;
 424 }
 425
 426 int
 427 libcfs_sock_setbuf (struct socket *sock, int txbufsize, int rxbufsize)
 428 {
 429         int              option;
 430         int              rc;
 431
 432         if (txbufsize != 0) {
 433                 option = txbufsize;
 434                 rc = kernel_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
 435                                      (char *)&option, sizeof (option));
 436                 if (rc != 0) {
 437                         CERROR ("Can't set send buffer %d: %d\n",
 438                                 option, rc);
 439                         return (rc);
 440                 }
 441         }
 442
 443         if (rxbufsize != 0) {
 444                 option = rxbufsize;
 445                 rc = kernel_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
 446                                       (char *)&option, sizeof (option));
 447                 if (rc != 0) {
 448                         CERROR ("Can't set receive buffer %d: %d\n",
 449                                 option, rc);
 450                         return (rc);
 451                 }
 452         }
 453
 454         return 0;
 455 }
 456
 457 EXPORT_SYMBOL(libcfs_sock_setbuf);
 458
 459 int
 460 libcfs_sock_getaddr (struct socket *sock, int remote, __u32 *ip, int *port)
 461 {
 462         struct sockaddr_in sin;
 463         int             len = sizeof (sin);
 464         int             rc;
 465
 466         rc = sock->ops->getname (sock, (struct sockaddr *)&sin, &len,
 467                                  remote ? 2 : 0);
 468         if (rc != 0) {
 469                 CERROR ("Error %d getting sock %s IP/port\n",
 470                         rc, remote ? "peer" : "local");
 471                 return rc;
 472         }
 473
 474         if (ip != NULL)
 475                 *ip = ntohl (sin.sin_addr.s_addr);
 476
 477         if (port != NULL)
 478                 *port = ntohs (sin.sin_port);
 479
 480         return 0;
 481 }
 482
 483 EXPORT_SYMBOL(libcfs_sock_getaddr);
 484
 485 int
 486 libcfs_sock_getbuf (struct socket *sock, int *txbufsize, int *rxbufsize)
 487 {
 488
 489         if (txbufsize != NULL) {
 490                 *txbufsize = sock->sk->sk_sndbuf;
 491         }
 492
 493         if (rxbufsize != NULL) {
 494                 *rxbufsize = sock->sk->sk_rcvbuf;
 495         }
 496
 497         return 0;
 498 }
 499
 500 EXPORT_SYMBOL(libcfs_sock_getbuf);
 501
 502 int
 503 libcfs_sock_listen (struct socket **sockp,
 504                     __u32 local_ip, int local_port, int backlog)
 505 {
 506         int      fatal;
 507         int      rc;
 508
 509         rc = libcfs_sock_create(sockp, &fatal, local_ip, local_port);
 510         if (rc != 0) {
 511                 if (!fatal)
 512                         CERROR("Can't create socket: port %d already in use\n",
 513                                local_port);
 514                 return rc;
 515         }
 516
 517         rc = (*sockp)->ops->listen(*sockp, backlog);
 518         if (rc == 0)
 519                 return 0;
 520
 521         CERROR("Can't set listen backlog %d: %d\n", backlog, rc);
 522         sock_release(*sockp);
 523         return rc;
 524 }
 525
 526 EXPORT_SYMBOL(libcfs_sock_listen);
 527
 528 int
 529 libcfs_sock_accept (struct socket **newsockp, struct socket *sock)
 530 {
 531         wait_queue_t   wait;
 532         struct socket *newsock;
 533         int         rc;
 534
 535         init_waitqueue_entry(&wait, current);
 536
 537         /* XXX this should add a ref to sock->ops->owner, if
 538          * TCP could be a module */
 539         rc = sock_create_lite(PF_PACKET, sock->type, IPPROTO_TCP, &newsock);
 540         if (rc) {
 541                 CERROR("Can't allocate socket\n");
 542                 return rc;
 543         }
 544
 545         newsock->ops = sock->ops;
 546
 547         set_current_state(TASK_INTERRUPTIBLE);
 548         add_wait_queue(cfs_sk_sleep(sock->sk), &wait);
 549
 550         rc = sock->ops->accept(sock, newsock, O_NONBLOCK);
 551         if (rc == -EAGAIN) {
 552                 /* Nothing ready, so wait for activity */
 553                 schedule();
 554                 rc = sock->ops->accept(sock, newsock, O_NONBLOCK);
 555         }
 556
 557         remove_wait_queue(cfs_sk_sleep(sock->sk), &wait);
 558         set_current_state(TASK_RUNNING);
 559
 560         if (rc != 0)
 561                 goto failed;
 562
 563         *newsockp = newsock;
 564         return 0;
 565
 566  failed:
 567         sock_release(newsock);
 568         return rc;
 569 }
 570
 571 EXPORT_SYMBOL(libcfs_sock_accept);
 572
 573 void
 574 libcfs_sock_abort_accept (struct socket *sock)
 575 {
 576         wake_up_all(cfs_sk_sleep(sock->sk));
 577 }
 578
 579 EXPORT_SYMBOL(libcfs_sock_abort_accept);
 580
 581 int
 582 libcfs_sock_connect (struct socket **sockp, int *fatal,
 583                      __u32 local_ip, int local_port,
 584                      __u32 peer_ip, int peer_port)
 585 {
 586         struct sockaddr_in  srvaddr;
 587         int              rc;
 588
 589         rc = libcfs_sock_create(sockp, fatal, local_ip, local_port);
 590         if (rc != 0)
 591                 return rc;
 592
 593         memset (&srvaddr, 0, sizeof (srvaddr));
 594         srvaddr.sin_family = AF_INET;
 595         srvaddr.sin_port = htons(peer_port);
 596         srvaddr.sin_addr.s_addr = htonl(peer_ip);
 597
 598         rc = (*sockp)->ops->connect(*sockp,
 599                                     (struct sockaddr *)&srvaddr, sizeof(srvaddr),
 600                                     0);
 601         if (rc == 0)
 602                 return 0;
 603
 604         /* EADDRNOTAVAIL probably means we're already connected to the same
 605          * peer/port on the same local port on a differently typed
 606          * connection.  Let our caller retry with a different local
 607          * port... */
 608         *fatal = !(rc == -EADDRNOTAVAIL);
 609
 610         CDEBUG_LIMIT(*fatal ? D_NETERROR : D_NET,
 611                "Error %d connecting %pI4h/%d -> %pI4h/%d\n", rc,
 612                &local_ip, local_port, &peer_ip, peer_port);
 613
 614         sock_release(*sockp);
 615         return rc;
 616 }
 617
 618 EXPORT_SYMBOL(libcfs_sock_connect);
 619
 620 void
 621 libcfs_sock_release (struct socket *sock)
 622 {
 623         sock_release(sock);
 624 }
 625
 626 EXPORT_SYMBOL(libcfs_sock_release);