zebra/ioctl.c

   1 /*
   2  * Common ioctl functions.
   3  * Copyright (C) 1997, 98 Kunihiro Ishiguro
   4  *
   5  * This file is part of GNU Zebra.
   6  *
   7  * GNU Zebra is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  * GNU Zebra is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
  19  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  20  * 02111-1307, USA.
  21  */
  22
  23 #include <zebra.h>
  24
  25 #include "linklist.h"
  26 #include "if.h"
  27 #include "prefix.h"
  28 #include "ioctl.h"
  29 #include "log.h"
  30 #include "privs.h"
  31
  32 #include "zebra/rib.h"
  33 #include "zebra/rt.h"
  34 #include "zebra/interface.h"
  35
  36 #ifdef HAVE_BSD_LINK_DETECT
  37 #include <net/if_media.h>
  38 #endif /* HAVE_BSD_LINK_DETECT*/
  39
  40 extern struct zebra_privs_t zserv_privs;
  41
  42 /* clear and set interface name string */
  43 void
  44 ifreq_set_name (struct ifreq *ifreq, struct interface *ifp)
  45 {
  46   strncpy (ifreq->ifr_name, ifp->name, IFNAMSIZ);
  47 }
  48
  49 /* call ioctl system call */
  50 int
  51 if_ioctl (u_long request, caddr_t buffer)
  52 {
  53   int sock;
  54   int ret;
  55   int err;
  56
  57   if (zserv_privs.change(ZPRIVS_RAISE))
  58     zlog (NULL, LOG_ERR, "Can't raise privileges");
  59   sock = socket (AF_INET, SOCK_DGRAM, 0);
  60   if (sock < 0)
  61     {
  62       int save_errno = errno;
  63       if (zserv_privs.change(ZPRIVS_LOWER))
  64         zlog (NULL, LOG_ERR, "Can't lower privileges");
  65       zlog_err("Cannot create UDP socket: %s", safe_strerror(save_errno));
  66       exit (1);
  67     }
  68   if ((ret = ioctl (sock, request, buffer)) < 0)
  69     err = errno;
  70   if (zserv_privs.change(ZPRIVS_LOWER))
  71     zlog (NULL, LOG_ERR, "Can't lower privileges");
  72   close (sock);
  73
  74   if (ret < 0)
  75     {
  76       errno = err;
  77       return ret;
  78     }
  79   return 0;
  80 }
  81
  82 #ifdef HAVE_IPV6
  83 static int
  84 if_ioctl_ipv6 (u_long request, caddr_t buffer)
  85 {
  86   int sock;
  87   int ret;
  88   int err;
  89
  90   if (zserv_privs.change(ZPRIVS_RAISE))
  91     zlog (NULL, LOG_ERR, "Can't raise privileges");
  92   sock = socket (AF_INET6, SOCK_DGRAM, 0);
  93   if (sock < 0)
  94     {
  95       int save_errno = errno;
  96       if (zserv_privs.change(ZPRIVS_LOWER))
  97         zlog (NULL, LOG_ERR, "Can't lower privileges");
  98       zlog_err("Cannot create IPv6 datagram socket: %s",
  99                safe_strerror(save_errno));
 100       exit (1);
 101     }
 102
 103   if ((ret = ioctl (sock, request, buffer)) < 0)
 104     err = errno;
 105   if (zserv_privs.change(ZPRIVS_LOWER))
 106     zlog (NULL, LOG_ERR, "Can't lower privileges");
 107   close (sock);
 108
 109   if (ret < 0)
 110     {
 111       errno = err;
 112       return ret;
 113     }
 114   return 0;
 115 }
 116 #endif /* HAVE_IPV6 */
 117
 118 /*
 119  * get interface metric
 120  *   -- if value is not avaliable set -1
 121  */
 122 void
 123 if_get_metric (struct interface *ifp)
 124 {
 125 #ifdef SIOCGIFMETRIC
 126   struct ifreq ifreq;
 127
 128   ifreq_set_name (&ifreq, ifp);
 129
 130   if (if_ioctl (SIOCGIFMETRIC, (caddr_t) &ifreq) < 0)
 131     return;
 132   ifp->metric = ifreq.ifr_metric;
 133   if (ifp->metric == 0)
 134     ifp->metric = 1;
 135 #else /* SIOCGIFMETRIC */
 136   ifp->metric = -1;
 137 #endif /* SIOCGIFMETRIC */
 138 }
 139
 140 /* get interface MTU */
 141 void
 142 if_get_mtu (struct interface *ifp)
 143 {
 144   struct ifreq ifreq;
 145
 146   ifreq_set_name (&ifreq, ifp);
 147
 148 #if defined(SIOCGIFMTU)
 149   if (if_ioctl (SIOCGIFMTU, (caddr_t) & ifreq) < 0)
 150     {
 151       zlog_info ("Can't lookup mtu by ioctl(SIOCGIFMTU)");
 152       ifp->mtu6 = ifp->mtu = -1;
 153       return;
 154     }
 155
 156 #ifdef SUNOS_5
 157   ifp->mtu6 = ifp->mtu = ifreq.ifr_metric;
 158 #else
 159   ifp->mtu6 = ifp->mtu = ifreq.ifr_mtu;
 160 #endif /* SUNOS_5 */
 161
 162   /* propogate */
 163   zebra_interface_up_update(ifp);
 164
 165 #else
 166   zlog (NULL, LOG_INFO, "Can't lookup mtu on this system");
 167   ifp->mtu6 = ifp->mtu = -1;
 168 #endif
 169 }
 170
 171 #ifdef HAVE_NETLINK
 172 /* Interface address setting via netlink interface. */
 173 int
 174 if_set_prefix (struct interface *ifp, struct connected *ifc)
 175 {
 176   return kernel_address_add_ipv4 (ifp, ifc);
 177 }
 178
 179 /* Interface address is removed using netlink interface. */
 180 int
 181 if_unset_prefix (struct interface *ifp, struct connected *ifc)
 182 {
 183   return kernel_address_delete_ipv4 (ifp, ifc);
 184 }
 185 #else /* ! HAVE_NETLINK */
 186 #ifdef HAVE_STRUCT_IFALIASREQ
 187 /* Set up interface's IP address, netmask (and broadcas? ).  *BSD may
 188    has ifaliasreq structure.  */
 189 int
 190 if_set_prefix (struct interface *ifp, struct connected *ifc)
 191 {
 192   int ret;
 193   struct ifaliasreq addreq;
 194   struct sockaddr_in addr;
 195   struct sockaddr_in mask;
 196   struct prefix_ipv4 *p;
 197
 198   p = (struct prefix_ipv4 *) ifc->address;
 199   rib_lookup_and_pushup (p);
 200
 201   memset (&addreq, 0, sizeof addreq);
 202   strncpy ((char *)&addreq.ifra_name, ifp->name, sizeof addreq.ifra_name);
 203
 204   memset (&addr, 0, sizeof (struct sockaddr_in));
 205   addr.sin_addr = p->prefix;
 206   addr.sin_family = p->family;
 207 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
 208   addr.sin_len = sizeof (struct sockaddr_in);
 209 #endif
 210   memcpy (&addreq.ifra_addr, &addr, sizeof (struct sockaddr_in));
 211
 212   memset (&mask, 0, sizeof (struct sockaddr_in));
 213   masklen2ip (p->prefixlen, &mask.sin_addr);
 214   mask.sin_family = p->family;
 215 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
 216   mask.sin_len = sizeof (struct sockaddr_in);
 217 #endif
 218   memcpy (&addreq.ifra_mask, &mask, sizeof (struct sockaddr_in));
 219
 220   ret = if_ioctl (SIOCAIFADDR, (caddr_t) &addreq);
 221   if (ret < 0)
 222     return ret;
 223   return 0;
 224 }
 225
 226 /* Set up interface's IP address, netmask (and broadcas? ).  *BSD may
 227    has ifaliasreq structure.  */
 228 int
 229 if_unset_prefix (struct interface *ifp, struct connected *ifc)
 230 {
 231   int ret;
 232   struct ifaliasreq addreq;
 233   struct sockaddr_in addr;
 234   struct sockaddr_in mask;
 235   struct prefix_ipv4 *p;
 236
 237   p = (struct prefix_ipv4 *)ifc->address;
 238
 239   memset (&addreq, 0, sizeof addreq);
 240   strncpy ((char *)&addreq.ifra_name, ifp->name, sizeof addreq.ifra_name);
 241
 242   memset (&addr, 0, sizeof (struct sockaddr_in));
 243   addr.sin_addr = p->prefix;
 244   addr.sin_family = p->family;
 245 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
 246   addr.sin_len = sizeof (struct sockaddr_in);
 247 #endif
 248   memcpy (&addreq.ifra_addr, &addr, sizeof (struct sockaddr_in));
 249
 250   memset (&mask, 0, sizeof (struct sockaddr_in));
 251   masklen2ip (p->prefixlen, &mask.sin_addr);
 252   mask.sin_family = p->family;
 253 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
 254   mask.sin_len = sizeof (struct sockaddr_in);
 255 #endif
 256   memcpy (&addreq.ifra_mask, &mask, sizeof (struct sockaddr_in));
 257
 258   ret = if_ioctl (SIOCDIFADDR, (caddr_t) &addreq);
 259   if (ret < 0)
 260     return ret;
 261   return 0;
 262 }
 263 #else
 264 /* Set up interface's address, netmask (and broadcas? ).  Linux or
 265    Solaris uses ifname:number semantics to set IP address aliases. */
 266 int
 267 if_set_prefix (struct interface *ifp, struct connected *ifc)
 268 {
 269   int ret;
 270   struct ifreq ifreq;
 271   struct sockaddr_in addr;
 272   struct sockaddr_in broad;
 273   struct sockaddr_in mask;
 274   struct prefix_ipv4 ifaddr;
 275   struct prefix_ipv4 *p;
 276
 277   p = (struct prefix_ipv4 *) ifc->address;
 278
 279   ifaddr = *p;
 280
 281   ifreq_set_name (&ifreq, ifp);
 282
 283   addr.sin_addr = p->prefix;
 284   addr.sin_family = p->family;
 285   memcpy (&ifreq.ifr_addr, &addr, sizeof (struct sockaddr_in));
 286   ret = if_ioctl (SIOCSIFADDR, (caddr_t) &ifreq);
 287   if (ret < 0)
 288     return ret;
 289
 290   /* We need mask for make broadcast addr. */
 291   masklen2ip (p->prefixlen, &mask.sin_addr);
 292
 293   if (if_is_broadcast (ifp))
 294     {
 295       apply_mask_ipv4 (&ifaddr);
 296       addr.sin_addr = ifaddr.prefix;
 297
 298       broad.sin_addr.s_addr = (addr.sin_addr.s_addr | ~mask.sin_addr.s_addr);
 299       broad.sin_family = p->family;
 300
 301       memcpy (&ifreq.ifr_broadaddr, &broad, sizeof (struct sockaddr_in));
 302       ret = if_ioctl (SIOCSIFBRDADDR, (caddr_t) &ifreq);
 303       if (ret < 0)
 304         return ret;
 305     }
 306
 307   mask.sin_family = p->family;
 308 #ifdef SUNOS_5
 309   memcpy (&mask, &ifreq.ifr_addr, sizeof (mask));
 310 #else
 311   memcpy (&ifreq.ifr_netmask, &mask, sizeof (struct sockaddr_in));
 312 #endif /* SUNOS5 */
 313   ret = if_ioctl (SIOCSIFNETMASK, (caddr_t) &ifreq);
 314   if (ret < 0)
 315     return ret;
 316
 317   return 0;
 318 }
 319
 320 /* Set up interface's address, netmask (and broadcas? ).  Linux or
 321    Solaris uses ifname:number semantics to set IP address aliases. */
 322 int
 323 if_unset_prefix (struct interface *ifp, struct connected *ifc)
 324 {
 325   int ret;
 326   struct ifreq ifreq;
 327   struct sockaddr_in addr;
 328   struct prefix_ipv4 *p;
 329
 330   p = (struct prefix_ipv4 *) ifc->address;
 331
 332   ifreq_set_name (&ifreq, ifp);
 333
 334   memset (&addr, 0, sizeof (struct sockaddr_in));
 335   addr.sin_family = p->family;
 336   memcpy (&ifreq.ifr_addr, &addr, sizeof (struct sockaddr_in));
 337   ret = if_ioctl (SIOCSIFADDR, (caddr_t) &ifreq);
 338   if (ret < 0)
 339     return ret;
 340
 341   return 0;
 342 }
 343 #endif /* HAVE_STRUCT_IFALIASREQ */
 344 #endif /* HAVE_NETLINK */
 345
 346 /* get interface flags */
 347 void
 348 if_get_flags (struct interface *ifp)
 349 {
 350   int ret;
 351   struct ifreq ifreq;
 352 #ifdef HAVE_BSD_LINK_DETECT
 353   struct ifmediareq ifmr;
 354 #endif /* HAVE_BSD_LINK_DETECT */
 355
 356   ifreq_set_name (&ifreq, ifp);
 357
 358   ret = if_ioctl (SIOCGIFFLAGS, (caddr_t) &ifreq);
 359   if (ret < 0)
 360     {
 361       zlog_err("if_ioctl(SIOCGIFFLAGS) failed: %s", safe_strerror(errno));
 362       return;
 363     }
 364 #ifdef HAVE_BSD_LINK_DETECT /* Detect BSD link-state at start-up */
 365
 366   /* Per-default, IFF_RUNNING is held high, unless link-detect says
 367    * otherwise - we abuse IFF_RUNNING inside zebra as a link-state flag,
 368    * following practice on Linux and Solaris kernels
 369    */
 370   SET_FLAG(ifreq.ifr_flags, IFF_RUNNING);
 371
 372   if (CHECK_FLAG (ifp->status, ZEBRA_INTERFACE_LINKDETECTION))
 373     {
 374       (void) memset(&ifmr, 0, sizeof(ifmr));
 375       strncpy (&ifmr.ifm_name, ifp->name, IFNAMSIZ);
 376
 377       /* Seems not all interfaces implement this ioctl */
 378       if (if_ioctl(SIOCGIFMEDIA, (caddr_t) &ifmr) < 0)
 379         zlog_err("if_ioctl(SIOCGIFMEDIA) failed: %s", safe_strerror(errno));
 380       else if (ifmr.ifm_status & IFM_AVALID) /* Link state is valid */
 381         {
 382           if (ifmr.ifm_status & IFM_ACTIVE)
 383             SET_FLAG(ifreq.ifr_flags, IFF_RUNNING);
 384           else
 385             UNSET_FLAG(ifreq.ifr_flags, IFF_RUNNING);
 386         }
 387   }
 388 #endif /* HAVE_BSD_LINK_DETECT */
 389
 390   if_flags_update (ifp, (ifreq.ifr_flags & 0x0000ffff));
 391 }
 392
 393 /* Set interface flags */
 394 int
 395 if_set_flags (struct interface *ifp, uint64_t flags)
 396 {
 397   int ret;
 398   struct ifreq ifreq;
 399
 400   memset (&ifreq, 0, sizeof(struct ifreq));
 401   ifreq_set_name (&ifreq, ifp);
 402
 403   ifreq.ifr_flags = ifp->flags;
 404   ifreq.ifr_flags |= flags;
 405
 406   ret = if_ioctl (SIOCSIFFLAGS, (caddr_t) &ifreq);
 407
 408   if (ret < 0)
 409     {
 410       zlog_info ("can't set interface flags");
 411       return ret;
 412     }
 413   return 0;
 414 }
 415
 416 /* Unset interface's flag. */
 417 int
 418 if_unset_flags (struct interface *ifp, uint64_t flags)
 419 {
 420   int ret;
 421   struct ifreq ifreq;
 422
 423   memset (&ifreq, 0, sizeof(struct ifreq));
 424   ifreq_set_name (&ifreq, ifp);
 425
 426   ifreq.ifr_flags = ifp->flags;
 427   ifreq.ifr_flags &= ~flags;
 428
 429   ret = if_ioctl (SIOCSIFFLAGS, (caddr_t) &ifreq);
 430
 431   if (ret < 0)
 432     {
 433       zlog_info ("can't unset interface flags");
 434       return ret;
 435     }
 436   return 0;
 437 }
 438
 439 #ifdef HAVE_IPV6
 440
 441 #ifdef LINUX_IPV6
 442 #ifndef _LINUX_IN6_H
 443 /* linux/include/net/ipv6.h */
 444 struct in6_ifreq
 445 {
 446   struct in6_addr ifr6_addr;
 447   u_int32_t ifr6_prefixlen;
 448   int ifr6_ifindex;
 449 };
 450 #endif /* _LINUX_IN6_H */
 451
 452 /* Interface's address add/delete functions. */
 453 int
 454 if_prefix_add_ipv6 (struct interface *ifp, struct connected *ifc)
 455 {
 456   int ret;
 457   struct prefix_ipv6 *p;
 458   struct in6_ifreq ifreq;
 459
 460   p = (struct prefix_ipv6 *) ifc->address;
 461
 462   memset (&ifreq, 0, sizeof (struct in6_ifreq));
 463
 464   memcpy (&ifreq.ifr6_addr, &p->prefix, sizeof (struct in6_addr));
 465   ifreq.ifr6_ifindex = ifp->ifindex;
 466   ifreq.ifr6_prefixlen = p->prefixlen;
 467
 468   ret = if_ioctl_ipv6 (SIOCSIFADDR, (caddr_t) &ifreq);
 469
 470   return ret;
 471 }
 472
 473 int
 474 if_prefix_delete_ipv6 (struct interface *ifp, struct connected *ifc)
 475 {
 476   int ret;
 477   struct prefix_ipv6 *p;
 478   struct in6_ifreq ifreq;
 479
 480   p = (struct prefix_ipv6 *) ifc->address;
 481
 482   memset (&ifreq, 0, sizeof (struct in6_ifreq));
 483
 484   memcpy (&ifreq.ifr6_addr, &p->prefix, sizeof (struct in6_addr));
 485   ifreq.ifr6_ifindex = ifp->ifindex;
 486   ifreq.ifr6_prefixlen = p->prefixlen;
 487
 488   ret = if_ioctl_ipv6 (SIOCDIFADDR, (caddr_t) &ifreq);
 489
 490   return ret;
 491 }
 492 #else /* LINUX_IPV6 */
 493 #ifdef HAVE_STRUCT_IN6_ALIASREQ
 494 #ifndef ND6_INFINITE_LIFETIME
 495 #define ND6_INFINITE_LIFETIME 0xffffffffL
 496 #endif /* ND6_INFINITE_LIFETIME */
 497 int
 498 if_prefix_add_ipv6 (struct interface *ifp, struct connected *ifc)
 499 {
 500   int ret;
 501   struct in6_aliasreq addreq;
 502   struct sockaddr_in6 addr;
 503   struct sockaddr_in6 mask;
 504   struct prefix_ipv6 *p;
 505
 506   p = (struct prefix_ipv6 * ) ifc->address;
 507
 508   memset (&addreq, 0, sizeof addreq);
 509   strncpy ((char *)&addreq.ifra_name, ifp->name, sizeof addreq.ifra_name);
 510
 511   memset (&addr, 0, sizeof (struct sockaddr_in6));
 512   addr.sin6_addr = p->prefix;
 513   addr.sin6_family = p->family;
 514 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
 515   addr.sin6_len = sizeof (struct sockaddr_in6);
 516 #endif
 517   memcpy (&addreq.ifra_addr, &addr, sizeof (struct sockaddr_in6));
 518
 519   memset (&mask, 0, sizeof (struct sockaddr_in6));
 520   masklen2ip6 (p->prefixlen, &mask.sin6_addr);
 521   mask.sin6_family = p->family;
 522 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
 523   mask.sin6_len = sizeof (struct sockaddr_in6);
 524 #endif
 525   memcpy (&addreq.ifra_prefixmask, &mask, sizeof (struct sockaddr_in6));
 526
 527   addreq.ifra_lifetime.ia6t_vltime = 0xffffffff;
 528   addreq.ifra_lifetime.ia6t_pltime = 0xffffffff;
 529
 530 #ifdef HAVE_STRUCT_IF6_ALIASREQ_IFRA_LIFETIME
 531   addreq.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
 532   addreq.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
 533 #endif
 534
 535   ret = if_ioctl_ipv6 (SIOCAIFADDR_IN6, (caddr_t) &addreq);
 536   if (ret < 0)
 537     return ret;
 538   return 0;
 539 }
 540
 541 int
 542 if_prefix_delete_ipv6 (struct interface *ifp, struct connected *ifc)
 543 {
 544   int ret;
 545   struct in6_aliasreq addreq;
 546   struct sockaddr_in6 addr;
 547   struct sockaddr_in6 mask;
 548   struct prefix_ipv6 *p;
 549
 550   p = (struct prefix_ipv6 *) ifc->address;
 551
 552   memset (&addreq, 0, sizeof addreq);
 553   strncpy ((char *)&addreq.ifra_name, ifp->name, sizeof addreq.ifra_name);
 554
 555   memset (&addr, 0, sizeof (struct sockaddr_in6));
 556   addr.sin6_addr = p->prefix;
 557   addr.sin6_family = p->family;
 558 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
 559   addr.sin6_len = sizeof (struct sockaddr_in6);
 560 #endif
 561   memcpy (&addreq.ifra_addr, &addr, sizeof (struct sockaddr_in6));
 562
 563   memset (&mask, 0, sizeof (struct sockaddr_in6));
 564   masklen2ip6 (p->prefixlen, &mask.sin6_addr);
 565   mask.sin6_family = p->family;
 566 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
 567   mask.sin6_len = sizeof (struct sockaddr_in6);
 568 #endif
 569   memcpy (&addreq.ifra_prefixmask, &mask, sizeof (struct sockaddr_in6));
 570
 571 #ifdef HAVE_STRUCT_IF6_ALIASREQ_IFRA_LIFETIME
 572   addreq.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
 573   addreq.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
 574 #endif
 575
 576   ret = if_ioctl_ipv6 (SIOCDIFADDR_IN6, (caddr_t) &addreq);
 577   if (ret < 0)
 578     return ret;
 579   return 0;
 580 }
 581 #else
 582 int
 583 if_prefix_add_ipv6 (struct interface *ifp, struct connected *ifc)
 584 {
 585   return 0;
 586 }
 587
 588 int
 589 if_prefix_delete_ipv6 (struct interface *ifp, struct connected *ifc)
 590 {
 591   return 0;
 592 }
 593 #endif /* HAVE_STRUCT_IN6_ALIASREQ */
 594
 595 #endif /* LINUX_IPV6 */
 596
 597 #endif /* HAVE_IPV6 */