bsd/kern/netboot.c

   1 /*
   2  * Copyright (c) 2001-2002 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25
  26 /*
  27  * History:
  28  * 14 December, 2001    Dieter Siegmund (dieter@apple.com)
  29  * - created
  30  */
  31 #include <sys/param.h>
  32 #include <sys/systm.h>
  33 #include <sys/kernel.h>
  34 #include <sys/conf.h>
  35 #include <sys/ioctl.h>
  36 #include <sys/proc.h>
  37 #include <sys/mount.h>
  38 #include <sys/mbuf.h>
  39 #include <sys/filedesc.h>
  40 #include <sys/vnode.h>
  41 #include <sys/malloc.h>
  42 #include <sys/socket.h>
  43 #include <sys/socketvar.h>
  44 #include <sys/reboot.h>
  45 #include <net/if.h>
  46 #include <net/if_dl.h>
  47 #include <net/if_types.h>
  48 #include <net/route.h>
  49 #include <netinet/in.h>
  50 #include <netinet/if_ether.h>
  51 #include <netinet/dhcp_options.h>
  52 #include <kern/kalloc.h>
  53 #include <pexpert/pexpert.h>
  54
  55 //#include <libkern/libkern.h>
  56 extern struct filedesc  filedesc0;
  57
  58 extern int      strncmp(const char *,const char *, size_t);
  59 extern unsigned long strtoul(const char *, char **, int);
  60 extern char *   strchr(const char *str, int ch);
  61
  62 extern int      nfs_mountroot(void);    /* nfs_vfsops.c */
  63 extern int (*mountroot)(void);
  64
  65 extern unsigned char    rootdevice[];
  66
  67 static int                      S_netboot = 0;
  68 static struct netboot_info *    S_netboot_info_p;
  69
  70 void *
  71 IOBSDRegistryEntryForDeviceTree(const char * path);
  72
  73 void
  74 IOBSDRegistryEntryRelease(void * entry);
  75
  76 const void *
  77 IOBSDRegistryEntryGetData(void * entry, const char * property_name,
  78                           int * packet_length);
  79
  80 extern int vndevice_root_image(const char * path, char devname[],
  81                                dev_t * dev_p);
  82 extern int di_root_image(const char *path, char devname[], dev_t *dev_p);
  83
  84 #define BOOTP_RESPONSE  "bootp-response"
  85 #define BSDP_RESPONSE   "bsdp-response"
  86 #define DHCP_RESPONSE   "dhcp-response"
  87
  88 extern int
  89 bootp(struct ifnet * ifp, struct in_addr * iaddr_p, int max_retry,
  90       struct in_addr * netmask_p, struct in_addr * router_p,
  91       struct proc * procp);
  92
  93
  94 /* forward declarations */
  95 int     inet_aton(char * cp, struct in_addr * pin);
  96
  97 boolean_t       netboot_iaddr(struct in_addr * iaddr_p);
  98 boolean_t       netboot_rootpath(struct in_addr * server_ip,
  99                                  char * name, int name_len,
 100                                  char * path, int path_len);
 101 int     netboot_setup(struct proc * p);
 102 int     netboot_mountroot(void);
 103 int     netboot_root(void);
 104
 105
 106
 107 #define IP_FORMAT       "%d.%d.%d.%d"
 108 #define IP_CH(ip)       ((u_char *)ip)
 109 #define IP_LIST(ip)     IP_CH(ip)[0],IP_CH(ip)[1],IP_CH(ip)[2],IP_CH(ip)[3]
 110
 111 #define kNetBootRootPathPrefixNFS       "nfs:"
 112 #define kNetBootRootPathPrefixHTTP      "http:"
 113
 114 typedef enum {
 115     kNetBootImageTypeUnknown = 0,
 116     kNetBootImageTypeNFS = 1,
 117     kNetBootImageTypeHTTP = 2,
 118 } NetBootImageType;
 119
 120 struct netboot_info {
 121     struct in_addr      client_ip;
 122     struct in_addr      server_ip;
 123     char *              server_name;
 124     int                 server_name_length;
 125     char *              mount_point;
 126     int                 mount_point_length;
 127     char *              image_path;
 128     int                 image_path_length;
 129     NetBootImageType    image_type;
 130     boolean_t           use_hdix;
 131 };
 132
 133 int
 134 inet_aton(char * cp, struct in_addr * pin)
 135 {
 136     u_char * b = (char *)pin;
 137     int    i;
 138     char * p;
 139
 140     for (p = cp, i = 0; i < 4; i++) {
 141         u_long l = strtoul(p, 0, 0);
 142         if (l > 255)
 143             return (FALSE);
 144         b[i] = l;
 145         p = strchr(p, '.');
 146         if (i < 3 && p == NULL)
 147             return (FALSE);
 148         p++;
 149     }
 150     return (TRUE);
 151 }
 152
 153 /*
 154  * Function: parse_booter_path
 155  * Purpose:
 156  *   Parse a string of the form:
 157  *        "<IP>:<host>:<mount>[:<image_path>]"
 158  *   into the given ip address, host, mount point, and optionally, image_path.
 159  *
 160  * Note:
 161  *   The passed in string is modified i.e. ':' is replaced by '\0'.
 162  * Example:
 163  *   "17.202.16.17:seaport:/release/.images/Image9/CurrentHera"
 164  */
 165 static __inline__ boolean_t
 166 parse_booter_path(char * path, struct in_addr * iaddr_p, char * * host,
 167                   char * * mount_dir, char * * image_path)
 168 {
 169     char *      start;
 170     char *      colon;
 171
 172     /* IP address */
 173     start = path;
 174     colon = strchr(start, ':');
 175     if (colon == NULL) {
 176         return (FALSE);
 177     }
 178     *colon = '\0';
 179     if (inet_aton(start, iaddr_p) != 1) {
 180         return (FALSE);
 181     }
 182
 183     /* host */
 184     start = colon + 1;
 185     colon = strchr(start, ':');
 186     if (colon == NULL) {
 187         return (FALSE);
 188     }
 189     *colon = '\0';
 190     *host = start;
 191
 192     /* mount */
 193     start = colon + 1;
 194     colon = strchr(start, ':');
 195     *mount_dir = start;
 196     if (colon == NULL) {
 197         *image_path = NULL;
 198     }
 199     else {
 200         /* image path */
 201         *colon = '\0';
 202         start = colon + 1;
 203         *image_path = start;
 204     }
 205     return (TRUE);
 206 }
 207
 208 /*
 209  * Function: find_colon
 210  * Purpose:
 211  *   Find the next unescaped instance of the colon character.
 212  *   If a colon is escaped (preceded by a backslash '\' character),
 213  *   shift the string over by one character to overwrite the backslash.
 214  */
 215 static __inline__ char *
 216 find_colon(char * str)
 217 {
 218     char * start = str;
 219     char * colon;
 220
 221     while ((colon = strchr(start, ':')) != NULL) {
 222         char * dst;
 223         char * src;
 224
 225         if (colon == start) {
 226             break;
 227         }
 228         if (colon[-1] != '\\')
 229             break;
 230         for (dst = colon - 1, src = colon; *dst != '\0'; dst++, src++) {
 231             *dst = *src;
 232         }
 233         start = colon;
 234     }
 235     return (colon);
 236 }
 237
 238 /*
 239  * Function: parse_netboot_path
 240  * Purpose:
 241  *   Parse a string of the form:
 242  *        "nfs:<IP>:<mount>[:<image_path>]"
 243  *   into the given ip address, host, mount point, and optionally, image_path.
 244  * Notes:
 245  * - the passed in string is modified i.e. ':' is replaced by '\0'
 246  * - literal colons must be escaped with a backslash
 247  *
 248  * Examples:
 249  * nfs:17.202.42.112:/Library/NetBoot/NetBootSP0:Jaguar/Jaguar.dmg
 250  * nfs:17.202.42.112:/Volumes/Foo\:/Library/NetBoot/NetBootSP0:Jaguar/Jaguar.dmg
 251  */
 252 static __inline__ boolean_t
 253 parse_netboot_path(char * path, struct in_addr * iaddr_p, char * * host,
 254                    char * * mount_dir, char * * image_path)
 255 {
 256     char *      start;
 257     char *      colon;
 258
 259     if (strncmp(path, kNetBootRootPathPrefixNFS,
 260                 strlen(kNetBootRootPathPrefixNFS)) != 0) {
 261         return (FALSE);
 262     }
 263
 264     /* IP address */
 265     start = path + strlen(kNetBootRootPathPrefixNFS);
 266     colon = strchr(start, ':');
 267     if (colon == NULL) {
 268         return (FALSE);
 269     }
 270     *colon = '\0';
 271     if (inet_aton(start, iaddr_p) != 1) {
 272         return (FALSE);
 273     }
 274
 275     /* mount point */
 276     start = colon + 1;
 277     colon = find_colon(start);
 278     *mount_dir = start;
 279     if (colon == NULL) {
 280         *image_path = NULL;
 281     }
 282     else {
 283         /* image path */
 284         *colon = '\0';
 285         start = colon + 1;
 286         (void)find_colon(start);
 287         *image_path = start;
 288     }
 289     *host = inet_ntoa(*iaddr_p);
 290     return (TRUE);
 291 }
 292
 293 static boolean_t
 294 parse_image_path(char * path, struct in_addr * iaddr_p, char * * host,
 295                  char * * mount_dir, char * * image_path)
 296 {
 297     if (path[0] >= '0' && path[0] <= '9') {
 298         return (parse_booter_path(path, iaddr_p, host, mount_dir,
 299                                   image_path));
 300     }
 301     return (parse_netboot_path(path, iaddr_p, host, mount_dir,
 302                                image_path));
 303 }
 304
 305 static boolean_t
 306 get_root_path(char * root_path)
 307 {
 308     void *              entry;
 309     boolean_t           found = FALSE;
 310     const void *        pkt;
 311     int                 pkt_len;
 312
 313     entry = IOBSDRegistryEntryForDeviceTree("/chosen");
 314     if (entry == NULL) {
 315         return (FALSE);
 316     }
 317     pkt = IOBSDRegistryEntryGetData(entry, BSDP_RESPONSE, &pkt_len);
 318     if (pkt != NULL && pkt_len >= (int)sizeof(struct dhcp)) {
 319         printf("netboot: retrieving root path from BSDP response\n");
 320     }
 321     else {
 322         pkt = IOBSDRegistryEntryGetData(entry, BOOTP_RESPONSE,
 323                                         &pkt_len);
 324         if (pkt != NULL && pkt_len >= (int)sizeof(struct dhcp)) {
 325             printf("netboot: retrieving root path from BOOTP response\n");
 326         }
 327     }
 328     if (pkt != NULL) {
 329         int                     len;
 330         dhcpol_t                options;
 331         char *                  path;
 332         struct dhcp *           reply;
 333
 334         reply = (struct dhcp *)pkt;
 335         (void)dhcpol_parse_packet(&options, reply, pkt_len, NULL);
 336
 337         path = (char *)dhcpol_find(&options,
 338                                    dhcptag_root_path_e, &len, NULL);
 339         if (path) {
 340             bcopy(path, root_path, len);
 341             root_path[len] = '\0';
 342             found = TRUE;
 343         }
 344     }
 345     IOBSDRegistryEntryRelease(entry);
 346     return (found);
 347
 348 }
 349
 350 static struct netboot_info *
 351 netboot_info_init(struct in_addr iaddr)
 352 {
 353     struct netboot_info *       info;
 354     char *                      root_path = NULL;
 355     boolean_t                   use_hdix = TRUE;
 356     char *                      vndevice = NULL;
 357
 358     MALLOC_ZONE(vndevice, caddr_t, MAXPATHLEN, M_NAMEI, M_WAITOK);
 359     if (PE_parse_boot_arg("vndevice", vndevice) == TRUE) {
 360         use_hdix = FALSE;
 361     }
 362     FREE_ZONE(vndevice, MAXPATHLEN, M_NAMEI);
 363
 364     info = (struct netboot_info *)kalloc(sizeof(*info));
 365     bzero(info, sizeof(*info));
 366     info->client_ip = iaddr;
 367     info->image_type = kNetBootImageTypeUnknown;
 368     info->use_hdix = use_hdix;
 369
 370     /* check for a booter-specified path then a NetBoot path */
 371     MALLOC_ZONE(root_path, caddr_t, MAXPATHLEN, M_NAMEI, M_WAITOK);
 372     if (PE_parse_boot_arg("rp", root_path) == TRUE
 373         || PE_parse_boot_arg("rootpath", root_path) == TRUE
 374         || get_root_path(root_path) == TRUE) {
 375         char * server_name = NULL;
 376         char * mount_point = NULL;
 377         char * image_path = NULL;
 378         struct in_addr  server_ip;
 379
 380         if (parse_image_path(root_path, &server_ip, &server_name,
 381                              &mount_point, &image_path)) {
 382             info->image_type = kNetBootImageTypeNFS;
 383             info->server_ip = server_ip;
 384             info->server_name_length = strlen(server_name) + 1;
 385             info->server_name = (char *)kalloc(info->server_name_length);
 386             info->mount_point_length = strlen(mount_point) + 1;
 387             info->mount_point = (char *)kalloc(info->mount_point_length);
 388             strcpy(info->server_name, server_name);
 389             strcpy(info->mount_point, mount_point);
 390
 391             printf("Server %s Mount %s",
 392                    server_name, info->mount_point);
 393             if (image_path != NULL) {
 394                 boolean_t       needs_slash = FALSE;
 395
 396                 info->image_path_length = strlen(image_path) + 1;
 397                 if (image_path[0] != '/') {
 398                     needs_slash = TRUE;
 399                     info->image_path_length++;
 400                 }
 401                 info->image_path = (char *)kalloc(info->image_path_length);
 402                 if (needs_slash) {
 403                     info->image_path[0] = '/';
 404                     strcpy(info->image_path + 1, image_path);
 405                 }
 406                 else {
 407                     strcpy(info->image_path, image_path);
 408                 }
 409                 printf(" Image %s", info->image_path);
 410             }
 411             printf("\n");
 412         }
 413         else if (strncmp(root_path, kNetBootRootPathPrefixHTTP,
 414                          strlen(kNetBootRootPathPrefixHTTP)) == 0) {
 415             /* only HDIX supports HTTP */
 416             info->image_type = kNetBootImageTypeHTTP;
 417             info->use_hdix = TRUE;
 418             info->image_path_length = strlen(root_path) + 1;
 419             info->image_path = (char *)kalloc(info->image_path_length);
 420             strcpy(info->image_path, root_path);
 421         }
 422         else {
 423             printf("netboot: root path uses unrecognized format\n");
 424         }
 425     }
 426     FREE_ZONE(root_path, MAXPATHLEN, M_NAMEI);
 427     return (info);
 428 }
 429
 430 static void
 431 netboot_info_free(struct netboot_info * * info_p)
 432 {
 433     struct netboot_info * info = *info_p;
 434
 435     if (info) {
 436         if (info->mount_point) {
 437             kfree((vm_offset_t)info->mount_point, info->mount_point_length);
 438         }
 439         if (info->server_name) {
 440             kfree((vm_offset_t)info->server_name, info->server_name_length);
 441         }
 442         if (info->image_path) {
 443             kfree((vm_offset_t)info->image_path, info->image_path_length);
 444         }
 445         kfree((vm_offset_t)info, sizeof(*info));
 446     }
 447     *info_p = NULL;
 448     return;
 449 }
 450
 451 boolean_t
 452 netboot_iaddr(struct in_addr * iaddr_p)
 453 {
 454     if (S_netboot_info_p == NULL)
 455         return (FALSE);
 456
 457     *iaddr_p = S_netboot_info_p->client_ip;
 458     return (TRUE);
 459 }
 460
 461 boolean_t
 462 netboot_rootpath(struct in_addr * server_ip,
 463                  char * name, int name_len,
 464                  char * path, int path_len)
 465 {
 466     if (S_netboot_info_p == NULL)
 467         return (FALSE);
 468
 469     name[0] = '\0';
 470     path[0] = '\0';
 471
 472     if (S_netboot_info_p->mount_point_length == 0) {
 473         return (FALSE);
 474     }
 475     if (path_len < S_netboot_info_p->mount_point_length) {
 476         printf("netboot: path too small %d < %d\n",
 477                path_len, S_netboot_info_p->mount_point_length);
 478         return (FALSE);
 479     }
 480     strcpy(path, S_netboot_info_p->mount_point);
 481     strncpy(name, S_netboot_info_p->server_name, name_len);
 482     *server_ip = S_netboot_info_p->server_ip;
 483     return (TRUE);
 484 }
 485
 486
 487 static boolean_t
 488 get_ip_parameters(struct in_addr * iaddr_p, struct in_addr * netmask_p,
 489                    struct in_addr * router_p)
 490 {
 491     void *              entry;
 492     const void *        pkt;
 493     int                 pkt_len;
 494
 495
 496     entry = IOBSDRegistryEntryForDeviceTree("/chosen");
 497     if (entry == NULL) {
 498         return (FALSE);
 499     }
 500     pkt = IOBSDRegistryEntryGetData(entry, DHCP_RESPONSE, &pkt_len);
 501     if (pkt != NULL && pkt_len >= (int)sizeof(struct dhcp)) {
 502         printf("netboot: retrieving IP information from DHCP response\n");
 503     }
 504     else {
 505         pkt = IOBSDRegistryEntryGetData(entry, BOOTP_RESPONSE, &pkt_len);
 506         if (pkt != NULL && pkt_len >= (int)sizeof(struct dhcp)) {
 507             printf("netboot: retrieving IP information from BOOTP response\n");
 508         }
 509     }
 510     if (pkt != NULL) {
 511         struct in_addr *        ip;
 512         int                     len;
 513         dhcpol_t                options;
 514         struct dhcp *           reply;
 515
 516         reply = (struct dhcp *)pkt;
 517         (void)dhcpol_parse_packet(&options, reply, pkt_len, NULL);
 518         *iaddr_p = reply->dp_yiaddr;
 519         ip = (struct in_addr *)
 520             dhcpol_find(&options,
 521                         dhcptag_subnet_mask_e, &len, NULL);
 522         if (ip) {
 523             *netmask_p = *ip;
 524         }
 525         ip = (struct in_addr *)
 526             dhcpol_find(&options, dhcptag_router_e, &len, NULL);
 527         if (ip) {
 528             *router_p = *ip;
 529         }
 530     }
 531     IOBSDRegistryEntryRelease(entry);
 532     return (pkt != NULL);
 533 }
 534
 535 static int
 536 inet_aifaddr(struct socket * so, char * name, const struct in_addr * addr,
 537              const struct in_addr * mask,
 538              const struct in_addr * broadcast)
 539 {
 540     struct sockaddr     blank_sin;
 541     struct ifaliasreq   ifra;
 542
 543     bzero(&blank_sin, sizeof(blank_sin));
 544     blank_sin.sa_len = sizeof(blank_sin);
 545     blank_sin.sa_family = AF_INET;
 546
 547     bzero(&ifra, sizeof(ifra));
 548     strncpy(ifra.ifra_name, name, sizeof(ifra.ifra_name));
 549     if (addr) {
 550         ifra.ifra_addr = blank_sin;
 551         ((struct sockaddr_in *)&ifra.ifra_addr)->sin_addr = *addr;
 552     }
 553     if (mask) {
 554         ifra.ifra_mask = blank_sin;
 555         ((struct sockaddr_in *)&ifra.ifra_mask)->sin_addr = *mask;
 556     }
 557     if (broadcast) {
 558         ifra.ifra_broadaddr = blank_sin;
 559         ((struct sockaddr_in *)&ifra.ifra_broadaddr)->sin_addr = *broadcast;
 560     }
 561     return (ifioctl(so, SIOCAIFADDR, (caddr_t)&ifra, current_proc()));
 562 }
 563
 564 static int
 565 route_cmd(int cmd, struct in_addr d, struct in_addr g,
 566           struct in_addr m, u_long more_flags)
 567 {
 568     struct sockaddr_in          dst;
 569     u_long                      flags = RTF_UP | RTF_STATIC;
 570     struct sockaddr_in          gw;
 571     struct sockaddr_in          mask;
 572
 573     flags |= more_flags;
 574
 575     /* destination */
 576     bzero((caddr_t)&dst, sizeof(dst));
 577     dst.sin_len = sizeof(dst);
 578     dst.sin_family = AF_INET;
 579     dst.sin_addr = d;
 580
 581     /* gateway */
 582     bzero((caddr_t)&gw, sizeof(gw));
 583     gw.sin_len = sizeof(gw);
 584     gw.sin_family = AF_INET;
 585     gw.sin_addr = g;
 586
 587     /* mask */
 588     bzero(&mask, sizeof(mask));
 589     mask.sin_len = sizeof(mask);
 590     mask.sin_family = AF_INET;
 591     mask.sin_addr = m;
 592
 593     return (rtrequest(cmd, (struct sockaddr *)&dst, (struct sockaddr *)&gw,
 594                       (struct sockaddr *)&mask, flags, NULL));
 595 }
 596
 597 static int
 598 default_route_add(struct in_addr router, boolean_t proxy_arp)
 599 {
 600     u_long                      flags = 0;
 601     struct in_addr              zeroes = { 0 };
 602
 603     if (proxy_arp == FALSE) {
 604         flags |= RTF_GATEWAY;
 605     }
 606     return (route_cmd(RTM_ADD, zeroes, router, zeroes, flags));
 607 }
 608
 609 static int
 610 host_route_delete(struct in_addr host)
 611 {
 612     struct in_addr              zeroes = { 0 };
 613
 614     return (route_cmd(RTM_DELETE, host, zeroes, zeroes, RTF_HOST));
 615 }
 616
 617 static struct ifnet *
 618 find_interface(void)
 619 {
 620     struct ifnet *              ifp = NULL;
 621
 622     if (rootdevice[0]) {
 623         ifp = ifunit(rootdevice);
 624     }
 625     if (ifp == NULL) {
 626         TAILQ_FOREACH(ifp, &ifnet, if_link)
 627             if ((ifp->if_flags &
 628                  (IFF_LOOPBACK|IFF_POINTOPOINT)) == 0)
 629                 break;
 630     }
 631     return (ifp);
 632 }
 633
 634 int
 635 netboot_mountroot(void)
 636 {
 637     int                         error = 0;
 638     struct in_addr              iaddr = { 0 };
 639     struct ifreq                ifr;
 640     struct ifnet *              ifp;
 641     struct in_addr              netmask = { 0 };
 642     struct proc *               procp = current_proc();
 643     struct in_addr              router = { 0 };
 644     struct socket *             so = NULL;
 645     unsigned int                try;
 646
 647     bzero(&ifr, sizeof(ifr));
 648
 649     thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
 650
 651     /* find the interface */
 652     ifp = find_interface();
 653     if (ifp == NULL) {
 654         printf("netboot: no suitable interface\n");
 655         error = ENXIO;
 656         goto failed;
 657     }
 658     sprintf(ifr.ifr_name, "%s%d", ifp->if_name, ifp->if_unit);
 659     printf("netboot: using network interface '%s'\n", ifr.ifr_name);
 660
 661     /* bring it up */
 662     if ((error = socreate(AF_INET, &so, SOCK_DGRAM, 0)) != 0) {
 663         printf("netboot: socreate, error=%d\n", error);
 664         goto failed;
 665     }
 666     ifr.ifr_flags = ifp->if_flags | IFF_UP;
 667     error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)&ifr, procp);
 668     if (error) {
 669         printf("netboot: SIFFLAGS, error=%d\n", error);
 670         goto failed;
 671     }
 672
 673     /* grab information from the registry */
 674     if (get_ip_parameters(&iaddr, &netmask, &router) == FALSE) {
 675         /* use BOOTP to retrieve IP address, netmask and router */
 676         error = bootp(ifp, &iaddr, 32, &netmask, &router, procp);
 677         if (error) {
 678             printf("netboot: BOOTP failed %d\n", error);
 679             goto failed;
 680         }
 681     }
 682     printf("netboot: IP address " IP_FORMAT, IP_LIST(&iaddr));
 683     if (netmask.s_addr) {
 684         printf(" netmask " IP_FORMAT, IP_LIST(&netmask));
 685     }
 686     if (router.s_addr) {
 687         printf(" router " IP_FORMAT, IP_LIST(&router));
 688     }
 689     printf("\n");
 690     error = inet_aifaddr(so, ifr.ifr_name, &iaddr, &netmask, NULL);
 691     if (error) {
 692         printf("netboot: inet_aifaddr failed, %d\n", error);
 693         goto failed;
 694     }
 695     if (router.s_addr == 0) {
 696         /* enable proxy arp if we don't have a router */
 697         router.s_addr = iaddr.s_addr;
 698     }
 699     printf("netboot: adding default route " IP_FORMAT "\n",
 700            IP_LIST(&router));
 701     error = default_route_add(router, router.s_addr == iaddr.s_addr);
 702     if (error) {
 703         printf("netboot: default_route_add failed %d\n", error);
 704     }
 705
 706     soclose(so);
 707     thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
 708
 709     S_netboot_info_p = netboot_info_init(iaddr);
 710     switch (S_netboot_info_p->image_type) {
 711     default:
 712     case kNetBootImageTypeNFS:
 713         for (try = 1; TRUE; try++) {
 714             error = nfs_mountroot();
 715             if (error == 0) {
 716                 break;
 717             }
 718             printf("netboot: nfs_mountroot() attempt %u failed; "
 719                    "clearing ARP entry and trying again\n", try);
 720             /*
 721              * error is either EHOSTDOWN or EHOSTUNREACH, which likely means
 722              * that the port we're plugged into has spanning tree enabled,
 723              * and either the router or the server can't answer our ARP
 724              * requests.  Clear the incomplete ARP entry by removing the
 725              * appropriate route, depending on the error code:
 726              *     EHOSTDOWN            NFS server's route
 727              *     EHOSTUNREACH         router's route
 728              */
 729             switch (error) {
 730             default:
 731                 /* NOT REACHED */
 732             case EHOSTDOWN:
 733                 /* remove the server's arp entry */
 734                 error = host_route_delete(S_netboot_info_p->server_ip);
 735                 if (error) {
 736                     printf("netboot: host_route_delete(" IP_FORMAT
 737                            ") failed %d\n",
 738                            IP_LIST(&S_netboot_info_p->server_ip), error);
 739                 }
 740                 break;
 741             case EHOSTUNREACH:
 742                 error = host_route_delete(router);
 743                 if (error) {
 744                     printf("netboot: host_route_delete(" IP_FORMAT
 745                            ") failed %d\n", IP_LIST(&router), error);
 746                 }
 747                 break;
 748             }
 749         }
 750         break;
 751     case kNetBootImageTypeHTTP:
 752         error = netboot_setup(procp);
 753         break;
 754     }
 755     if (error == 0) {
 756         S_netboot = 1;
 757     }
 758     else {
 759         S_netboot = 0;
 760     }
 761     return (error);
 762 failed:
 763     if (so != NULL) {
 764         soclose(so);
 765     }
 766     thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
 767     return (error);
 768 }
 769
 770 int
 771 netboot_setup(struct proc * p)
 772 {
 773     dev_t       dev;
 774     int         error = 0;
 775
 776     if (S_netboot_info_p == NULL
 777         || S_netboot_info_p->image_path == NULL) {
 778         goto done;
 779     }
 780     if (S_netboot_info_p->use_hdix) {
 781         printf("netboot_setup: calling di_root_image\n");
 782         error = di_root_image(S_netboot_info_p->image_path,
 783                               rootdevice, &dev);
 784         if (error) {
 785             printf("netboot_setup: di_root_image: failed %d\n", error);
 786             goto done;
 787         }
 788     }
 789     else {
 790         printf("netboot_setup: calling vndevice_root_image\n");
 791         error = vndevice_root_image(S_netboot_info_p->image_path,
 792                                     rootdevice, &dev);
 793         if (error) {
 794             printf("netboot_setup: vndevice_root_image: failed %d\n", error);
 795             goto done;
 796         }
 797     }
 798     rootdev = dev;
 799     mountroot = NULL;
 800     printf("netboot: root device 0x%x\n", rootdev);
 801     error = vfs_mountroot();
 802     if (error == 0 && rootvnode != NULL) {
 803         struct vnode *tvp;
 804         struct vnode *newdp;
 805
 806         /* Get the vnode for '/'.  Set fdp->fd_fd.fd_cdir to reference it. */
 807         if (VFS_ROOT(mountlist.cqh_last, &newdp))
 808                 panic("netboot_setup: cannot find root vnode");
 809         VREF(newdp);
 810         tvp = rootvnode;
 811         vrele(tvp);
 812         filedesc0.fd_cdir = newdp;
 813         rootvnode = newdp;
 814         simple_lock(&mountlist_slock);
 815         CIRCLEQ_REMOVE(&mountlist, CIRCLEQ_FIRST(&mountlist), mnt_list);
 816         simple_unlock(&mountlist_slock);
 817         VOP_UNLOCK(rootvnode, 0, p);
 818         mountlist.cqh_first->mnt_flag |= MNT_ROOTFS;
 819     }
 820  done:
 821     netboot_info_free(&S_netboot_info_p);
 822     return (error);
 823 }
 824
 825 int
 826 netboot_root(void)
 827 {
 828     return (S_netboot);
 829 }