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   1 /*
   2  *  $Id: ipconfig.c,v 1.46 2002/02/01 22:01:04 davem Exp $
   3  *
   4  *  Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
   5  *  user-supplied information to configure own IP address and routes.
   6  *
   7  *  Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
   8  *
   9  *  Derived from network configuration code in fs/nfs/nfsroot.c,
  10  *  originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
  11  *
  12  *  BOOTP rewritten to construct and analyse packets itself instead
  13  *  of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
  14  *                                           -- MJ, December 1998
  15  *
  16  *  Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
  17  *  initialization scheme.
  18  *      - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
  19  *
  20  *  DHCP support added.  To users this looks like a whole separate
  21  *  protocol, but we know it's just a bag on the side of BOOTP.
  22  *              -- Chip Salzenberg <chip@valinux.com>, May 2000
  23  *
  24  *  Ported DHCP support from 2.2.16 to 2.4.0-test4
  25  *              -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
  26  *
  27  *  Merged changes from 2.2.19 into 2.4.3
  28  *              -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
  29  *
  30  *  Multiple Nameservers in /proc/net/pnp
  31  *              --  Josef Siemes <jsiemes@web.de>, Aug 2002
  32  */
  33
  34 #include <linux/types.h>
  35 #include <linux/string.h>
  36 #include <linux/kernel.h>
  37 #include <linux/jiffies.h>
  38 #include <linux/random.h>
  39 #include <linux/init.h>
  40 #include <linux/utsname.h>
  41 #include <linux/in.h>
  42 #include <linux/if.h>
  43 #include <linux/inet.h>
  44 #include <linux/inetdevice.h>
  45 #include <linux/netdevice.h>
  46 #include <linux/if_arp.h>
  47 #include <linux/skbuff.h>
  48 #include <linux/ip.h>
  49 #include <linux/socket.h>
  50 #include <linux/route.h>
  51 #include <linux/udp.h>
  52 #include <linux/proc_fs.h>
  53 #include <linux/seq_file.h>
  54 #include <linux/major.h>
  55 #include <linux/root_dev.h>
  56 #include <linux/delay.h>
  57 #include <linux/nfs_fs.h>
  58 #include <net/net_namespace.h>
  59 #include <net/arp.h>
  60 #include <net/ip.h>
  61 #include <net/ipconfig.h>
  62 #include <net/route.h>
  63
  64 #include <asm/uaccess.h>
  65 #include <net/checksum.h>
  66 #include <asm/processor.h>
  67
  68 /* Define this to allow debugging output */
  69 #undef IPCONFIG_DEBUG
  70
  71 #ifdef IPCONFIG_DEBUG
  72 #define DBG(x) printk x
  73 #else
  74 #define DBG(x) do { } while(0)
  75 #endif
  76
  77 #if defined(CONFIG_IP_PNP_DHCP)
  78 #define IPCONFIG_DHCP
  79 #endif
  80 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
  81 #define IPCONFIG_BOOTP
  82 #endif
  83 #if defined(CONFIG_IP_PNP_RARP)
  84 #define IPCONFIG_RARP
  85 #endif
  86 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
  87 #define IPCONFIG_DYNAMIC
  88 #endif
  89
  90 /* Define the friendly delay before and after opening net devices */
  91 #define CONF_PRE_OPEN           500     /* Before opening: 1/2 second */
  92 #define CONF_POST_OPEN          1       /* After opening: 1 second */
  93
  94 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
  95 #define CONF_OPEN_RETRIES       2       /* (Re)open devices twice */
  96 #define CONF_SEND_RETRIES       6       /* Send six requests per open */
  97 #define CONF_INTER_TIMEOUT      (HZ/2)  /* Inter-device timeout: 1/2 second */
  98 #define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
  99 #define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
 100 #define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
 101 #define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
 102 #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
 103                                            - '3' from resolv.h */
 104
 105 #define NONE __constant_htonl(INADDR_NONE)
 106
 107 /*
 108  * Public IP configuration
 109  */
 110
 111 /* This is used by platforms which might be able to set the ipconfig
 112  * variables using firmware environment vars.  If this is set, it will
 113  * ignore such firmware variables.
 114  */
 115 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
 116
 117 static int ic_enable __initdata = 0;            /* IP config enabled? */
 118
 119 /* Protocol choice */
 120 int ic_proto_enabled __initdata = 0
 121 #ifdef IPCONFIG_BOOTP
 122                         | IC_BOOTP
 123 #endif
 124 #ifdef CONFIG_IP_PNP_DHCP
 125                         | IC_USE_DHCP
 126 #endif
 127 #ifdef IPCONFIG_RARP
 128                         | IC_RARP
 129 #endif
 130                         ;
 131
 132 static int ic_host_name_set __initdata = 0;     /* Host name set by us? */
 133
 134 __be32 ic_myaddr = NONE;                /* My IP address */
 135 static __be32 ic_netmask = NONE;        /* Netmask for local subnet */
 136 __be32 ic_gateway = NONE;       /* Gateway IP address */
 137
 138 __be32 ic_servaddr = NONE;      /* Boot server IP address */
 139
 140 __be32 root_server_addr = NONE; /* Address of NFS server */
 141 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
 142
 143 static char vendor_class_identifier[253]; /* vendor class identifier */
 144
 145 /* Persistent data: */
 146
 147 static int ic_proto_used;                       /* Protocol used, if any */
 148 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
 149 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
 150
 151 /*
 152  * Private state.
 153  */
 154
 155 /* Name of user-selected boot device */
 156 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
 157
 158 /* Protocols supported by available interfaces */
 159 static int ic_proto_have_if __initdata = 0;
 160
 161 #ifdef IPCONFIG_DYNAMIC
 162 static DEFINE_SPINLOCK(ic_recv_lock);
 163 static volatile int ic_got_reply __initdata = 0;    /* Proto(s) that replied */
 164 #endif
 165 #ifdef IPCONFIG_DHCP
 166 static int ic_dhcp_msgtype __initdata = 0;      /* DHCP msg type received */
 167 #endif
 168
 169
 170 /*
 171  *      Network devices
 172  */
 173
 174 struct ic_device {
 175         struct ic_device *next;
 176         struct net_device *dev;
 177         unsigned short flags;
 178         short able;
 179         __be32 xid;
 180 };
 181
 182 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
 183 static struct net_device *ic_dev __initdata = NULL;     /* Selected device */
 184
 185 static int __init ic_open_devs(void)
 186 {
 187         struct ic_device *d, **last;
 188         struct net_device *dev;
 189         unsigned short oflags;
 190
 191         last = &ic_first_dev;
 192         rtnl_lock();
 193
 194         /* bring loopback device up first */
 195         for_each_netdev(&init_net, dev) {
 196                 if (!(dev->flags & IFF_LOOPBACK))
 197                         continue;
 198                 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
 199                         printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
 200         }
 201
 202         for_each_netdev(&init_net, dev) {
 203                 if (dev->flags & IFF_LOOPBACK)
 204                         continue;
 205                 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
 206                     (!(dev->flags & IFF_LOOPBACK) &&
 207                      (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
 208                      strncmp(dev->name, "dummy", 5))) {
 209                         int able = 0;
 210                         if (dev->mtu >= 364)
 211                                 able |= IC_BOOTP;
 212                         else
 213                                 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
 214                         if (!(dev->flags & IFF_NOARP))
 215                                 able |= IC_RARP;
 216                         able &= ic_proto_enabled;
 217                         if (ic_proto_enabled && !able)
 218                                 continue;
 219                         oflags = dev->flags;
 220                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
 221                                 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
 222                                 continue;
 223                         }
 224                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
 225                                 rtnl_unlock();
 226                                 return -1;
 227                         }
 228                         d->dev = dev;
 229                         *last = d;
 230                         last = &d->next;
 231                         d->flags = oflags;
 232                         d->able = able;
 233                         if (able & IC_BOOTP)
 234                                 get_random_bytes(&d->xid, sizeof(__be32));
 235                         else
 236                                 d->xid = 0;
 237                         ic_proto_have_if |= able;
 238                         DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
 239                                 dev->name, able, d->xid));
 240                 }
 241         }
 242         rtnl_unlock();
 243
 244         *last = NULL;
 245
 246         if (!ic_first_dev) {
 247                 if (user_dev_name[0])
 248                         printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
 249                 else
 250                         printk(KERN_ERR "IP-Config: No network devices available.\n");
 251                 return -1;
 252         }
 253         return 0;
 254 }
 255
 256 static void __init ic_close_devs(void)
 257 {
 258         struct ic_device *d, *next;
 259         struct net_device *dev;
 260
 261         rtnl_lock();
 262         next = ic_first_dev;
 263         while ((d = next)) {
 264                 next = d->next;
 265                 dev = d->dev;
 266                 if (dev != ic_dev) {
 267                         DBG(("IP-Config: Downing %s\n", dev->name));
 268                         dev_change_flags(dev, d->flags);
 269                 }
 270                 kfree(d);
 271         }
 272         rtnl_unlock();
 273 }
 274
 275 /*
 276  *      Interface to various network functions.
 277  */
 278
 279 static inline void
 280 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
 281 {
 282         sin->sin_family = AF_INET;
 283         sin->sin_addr.s_addr = addr;
 284         sin->sin_port = port;
 285 }
 286
 287 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
 288 {
 289         int res;
 290
 291         mm_segment_t oldfs = get_fs();
 292         set_fs(get_ds());
 293         res = devinet_ioctl(cmd, (struct ifreq __user *) arg);
 294         set_fs(oldfs);
 295         return res;
 296 }
 297
 298 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
 299 {
 300         int res;
 301
 302         mm_segment_t oldfs = get_fs();
 303         set_fs(get_ds());
 304         res = ip_rt_ioctl(cmd, (void __user *) arg);
 305         set_fs(oldfs);
 306         return res;
 307 }
 308
 309 /*
 310  *      Set up interface addresses and routes.
 311  */
 312
 313 static int __init ic_setup_if(void)
 314 {
 315         struct ifreq ir;
 316         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
 317         int err;
 318
 319         memset(&ir, 0, sizeof(ir));
 320         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
 321         set_sockaddr(sin, ic_myaddr, 0);
 322         if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
 323                 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
 324                 return -1;
 325         }
 326         set_sockaddr(sin, ic_netmask, 0);
 327         if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
 328                 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
 329                 return -1;
 330         }
 331         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
 332         if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
 333                 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
 334                 return -1;
 335         }
 336         return 0;
 337 }
 338
 339 static int __init ic_setup_routes(void)
 340 {
 341         /* No need to setup device routes, only the default route... */
 342
 343         if (ic_gateway != NONE) {
 344                 struct rtentry rm;
 345                 int err;
 346
 347                 memset(&rm, 0, sizeof(rm));
 348                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
 349                         printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
 350                         return -1;
 351                 }
 352                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
 353                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
 354                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
 355                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
 356                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
 357                         printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
 358                         return -1;
 359                 }
 360         }
 361
 362         return 0;
 363 }
 364
 365 /*
 366  *      Fill in default values for all missing parameters.
 367  */
 368
 369 static int __init ic_defaults(void)
 370 {
 371         /*
 372          *      At this point we have no userspace running so need not
 373          *      claim locks on system_utsname
 374          */
 375
 376         if (!ic_host_name_set)
 377                 sprintf(init_utsname()->nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr));
 378
 379         if (root_server_addr == NONE)
 380                 root_server_addr = ic_servaddr;
 381
 382         if (ic_netmask == NONE) {
 383                 if (IN_CLASSA(ntohl(ic_myaddr)))
 384                         ic_netmask = htonl(IN_CLASSA_NET);
 385                 else if (IN_CLASSB(ntohl(ic_myaddr)))
 386                         ic_netmask = htonl(IN_CLASSB_NET);
 387                 else if (IN_CLASSC(ntohl(ic_myaddr)))
 388                         ic_netmask = htonl(IN_CLASSC_NET);
 389                 else {
 390                         printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n",
 391                                 NIPQUAD(ic_myaddr));
 392                         return -1;
 393                 }
 394                 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask));
 395         }
 396
 397         return 0;
 398 }
 399
 400 /*
 401  *      RARP support.
 402  */
 403
 404 #ifdef IPCONFIG_RARP
 405
 406 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 407
 408 static struct packet_type rarp_packet_type __initdata = {
 409         .type = __constant_htons(ETH_P_RARP),
 410         .func = ic_rarp_recv,
 411 };
 412
 413 static inline void ic_rarp_init(void)
 414 {
 415         dev_add_pack(&rarp_packet_type);
 416 }
 417
 418 static inline void ic_rarp_cleanup(void)
 419 {
 420         dev_remove_pack(&rarp_packet_type);
 421 }
 422
 423 /*
 424  *  Process received RARP packet.
 425  */
 426 static int __init
 427 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 428 {
 429         struct arphdr *rarp;
 430         unsigned char *rarp_ptr;
 431         __be32 sip, tip;
 432         unsigned char *sha, *tha;               /* s for "source", t for "target" */
 433         struct ic_device *d;
 434
 435         if (dev->nd_net != &init_net)
 436                 goto drop;
 437
 438         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 439                 return NET_RX_DROP;
 440
 441         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
 442                 goto drop;
 443
 444         /* Basic sanity checks can be done without the lock.  */
 445         rarp = (struct arphdr *)skb_transport_header(skb);
 446
 447         /* If this test doesn't pass, it's not IP, or we should
 448          * ignore it anyway.
 449          */
 450         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
 451                 goto drop;
 452
 453         /* If it's not a RARP reply, delete it. */
 454         if (rarp->ar_op != htons(ARPOP_RREPLY))
 455                 goto drop;
 456
 457         /* If it's not Ethernet, delete it. */
 458         if (rarp->ar_pro != htons(ETH_P_IP))
 459                 goto drop;
 460
 461         if (!pskb_may_pull(skb,
 462                            sizeof(struct arphdr) +
 463                            (2 * dev->addr_len) +
 464                            (2 * 4)))
 465                 goto drop;
 466
 467         /* OK, it is all there and looks valid, process... */
 468         rarp = (struct arphdr *)skb_transport_header(skb);
 469         rarp_ptr = (unsigned char *) (rarp + 1);
 470
 471         /* One reply at a time, please. */
 472         spin_lock(&ic_recv_lock);
 473
 474         /* If we already have a reply, just drop the packet */
 475         if (ic_got_reply)
 476                 goto drop_unlock;
 477
 478         /* Find the ic_device that the packet arrived on */
 479         d = ic_first_dev;
 480         while (d && d->dev != dev)
 481                 d = d->next;
 482         if (!d)
 483                 goto drop_unlock;       /* should never happen */
 484
 485         /* Extract variable-width fields */
 486         sha = rarp_ptr;
 487         rarp_ptr += dev->addr_len;
 488         memcpy(&sip, rarp_ptr, 4);
 489         rarp_ptr += 4;
 490         tha = rarp_ptr;
 491         rarp_ptr += dev->addr_len;
 492         memcpy(&tip, rarp_ptr, 4);
 493
 494         /* Discard packets which are not meant for us. */
 495         if (memcmp(tha, dev->dev_addr, dev->addr_len))
 496                 goto drop_unlock;
 497
 498         /* Discard packets which are not from specified server. */
 499         if (ic_servaddr != NONE && ic_servaddr != sip)
 500                 goto drop_unlock;
 501
 502         /* We have a winner! */
 503         ic_dev = dev;
 504         if (ic_myaddr == NONE)
 505                 ic_myaddr = tip;
 506         ic_servaddr = sip;
 507         ic_got_reply = IC_RARP;
 508
 509 drop_unlock:
 510         /* Show's over.  Nothing to see here.  */
 511         spin_unlock(&ic_recv_lock);
 512
 513 drop:
 514         /* Throw the packet out. */
 515         kfree_skb(skb);
 516         return 0;
 517 }
 518
 519
 520 /*
 521  *  Send RARP request packet over a single interface.
 522  */
 523 static void __init ic_rarp_send_if(struct ic_device *d)
 524 {
 525         struct net_device *dev = d->dev;
 526         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
 527                  dev->dev_addr, dev->dev_addr);
 528 }
 529 #endif
 530
 531 /*
 532  *      DHCP/BOOTP support.
 533  */
 534
 535 #ifdef IPCONFIG_BOOTP
 536
 537 struct bootp_pkt {              /* BOOTP packet format */
 538         struct iphdr iph;       /* IP header */
 539         struct udphdr udph;     /* UDP header */
 540         u8 op;                  /* 1=request, 2=reply */
 541         u8 htype;               /* HW address type */
 542         u8 hlen;                /* HW address length */
 543         u8 hops;                /* Used only by gateways */
 544         __be32 xid;             /* Transaction ID */
 545         __be16 secs;            /* Seconds since we started */
 546         __be16 flags;           /* Just what it says */
 547         __be32 client_ip;               /* Client's IP address if known */
 548         __be32 your_ip;         /* Assigned IP address */
 549         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
 550         __be32 relay_ip;                /* IP address of BOOTP relay */
 551         u8 hw_addr[16];         /* Client's HW address */
 552         u8 serv_name[64];       /* Server host name */
 553         u8 boot_file[128];      /* Name of boot file */
 554         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
 555 };
 556
 557 /* packet ops */
 558 #define BOOTP_REQUEST   1
 559 #define BOOTP_REPLY     2
 560
 561 /* DHCP message types */
 562 #define DHCPDISCOVER    1
 563 #define DHCPOFFER       2
 564 #define DHCPREQUEST     3
 565 #define DHCPDECLINE     4
 566 #define DHCPACK         5
 567 #define DHCPNAK         6
 568 #define DHCPRELEASE     7
 569 #define DHCPINFORM      8
 570
 571 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 572
 573 static struct packet_type bootp_packet_type __initdata = {
 574         .type = __constant_htons(ETH_P_IP),
 575         .func = ic_bootp_recv,
 576 };
 577
 578
 579 /*
 580  *  Initialize DHCP/BOOTP extension fields in the request.
 581  */
 582
 583 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
 584
 585 #ifdef IPCONFIG_DHCP
 586
 587 static void __init
 588 ic_dhcp_init_options(u8 *options)
 589 {
 590         u8 mt = ((ic_servaddr == NONE)
 591                  ? DHCPDISCOVER : DHCPREQUEST);
 592         u8 *e = options;
 593         int len;
 594
 595 #ifdef IPCONFIG_DEBUG
 596         printk("DHCP: Sending message type %d\n", mt);
 597 #endif
 598
 599         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 600         e += 4;
 601
 602         *e++ = 53;              /* DHCP message type */
 603         *e++ = 1;
 604         *e++ = mt;
 605
 606         if (mt == DHCPREQUEST) {
 607                 *e++ = 54;      /* Server ID (IP address) */
 608                 *e++ = 4;
 609                 memcpy(e, &ic_servaddr, 4);
 610                 e += 4;
 611
 612                 *e++ = 50;      /* Requested IP address */
 613                 *e++ = 4;
 614                 memcpy(e, &ic_myaddr, 4);
 615                 e += 4;
 616         }
 617
 618         /* always? */
 619         {
 620                 static const u8 ic_req_params[] = {
 621                         1,      /* Subnet mask */
 622                         3,      /* Default gateway */
 623                         6,      /* DNS server */
 624                         12,     /* Host name */
 625                         15,     /* Domain name */
 626                         17,     /* Boot path */
 627                         40,     /* NIS domain name */
 628                 };
 629
 630                 *e++ = 55;      /* Parameter request list */
 631                 *e++ = sizeof(ic_req_params);
 632                 memcpy(e, ic_req_params, sizeof(ic_req_params));
 633                 e += sizeof(ic_req_params);
 634
 635                 if (*vendor_class_identifier) {
 636                         printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
 637                                vendor_class_identifier);
 638                         *e++ = 60;      /* Class-identifier */
 639                         len = strlen(vendor_class_identifier);
 640                         *e++ = len;
 641                         memcpy(e, vendor_class_identifier, len);
 642                         e += len;
 643                 }
 644         }
 645
 646         *e++ = 255;     /* End of the list */
 647 }
 648
 649 #endif /* IPCONFIG_DHCP */
 650
 651 static void __init ic_bootp_init_ext(u8 *e)
 652 {
 653         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 654         e += 4;
 655         *e++ = 1;               /* Subnet mask request */
 656         *e++ = 4;
 657         e += 4;
 658         *e++ = 3;               /* Default gateway request */
 659         *e++ = 4;
 660         e += 4;
 661         *e++ = 5;               /* Name server request */
 662         *e++ = 8;
 663         e += 8;
 664         *e++ = 12;              /* Host name request */
 665         *e++ = 32;
 666         e += 32;
 667         *e++ = 40;              /* NIS Domain name request */
 668         *e++ = 32;
 669         e += 32;
 670         *e++ = 17;              /* Boot path */
 671         *e++ = 40;
 672         e += 40;
 673
 674         *e++ = 57;              /* set extension buffer size for reply */
 675         *e++ = 2;
 676         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
 677         *e++ = 150;
 678
 679         *e++ = 255;             /* End of the list */
 680 }
 681
 682
 683 /*
 684  *  Initialize the DHCP/BOOTP mechanism.
 685  */
 686 static inline void ic_bootp_init(void)
 687 {
 688         int i;
 689
 690         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
 691                 ic_nameservers[i] = NONE;
 692
 693         dev_add_pack(&bootp_packet_type);
 694 }
 695
 696
 697 /*
 698  *  DHCP/BOOTP cleanup.
 699  */
 700 static inline void ic_bootp_cleanup(void)
 701 {
 702         dev_remove_pack(&bootp_packet_type);
 703 }
 704
 705
 706 /*
 707  *  Send DHCP/BOOTP request to single interface.
 708  */
 709 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
 710 {
 711         struct net_device *dev = d->dev;
 712         struct sk_buff *skb;
 713         struct bootp_pkt *b;
 714         int hh_len = LL_RESERVED_SPACE(dev);
 715         struct iphdr *h;
 716
 717         /* Allocate packet */
 718         skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
 719         if (!skb)
 720                 return;
 721         skb_reserve(skb, hh_len);
 722         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
 723         memset(b, 0, sizeof(struct bootp_pkt));
 724
 725         /* Construct IP header */
 726         skb_reset_network_header(skb);
 727         h = ip_hdr(skb);
 728         h->version = 4;
 729         h->ihl = 5;
 730         h->tot_len = htons(sizeof(struct bootp_pkt));
 731         h->frag_off = htons(IP_DF);
 732         h->ttl = 64;
 733         h->protocol = IPPROTO_UDP;
 734         h->daddr = htonl(INADDR_BROADCAST);
 735         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
 736
 737         /* Construct UDP header */
 738         b->udph.source = htons(68);
 739         b->udph.dest = htons(67);
 740         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
 741         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
 742
 743         /* Construct DHCP/BOOTP header */
 744         b->op = BOOTP_REQUEST;
 745         if (dev->type < 256) /* check for false types */
 746                 b->htype = dev->type;
 747         else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
 748                 b->htype = ARPHRD_IEEE802;
 749         else if (dev->type == ARPHRD_FDDI)
 750                 b->htype = ARPHRD_ETHER;
 751         else {
 752                 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
 753                 b->htype = dev->type; /* can cause undefined behavior */
 754         }
 755         b->hlen = dev->addr_len;
 756         b->your_ip = NONE;
 757         b->server_ip = NONE;
 758         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
 759         b->secs = htons(jiffies_diff / HZ);
 760         b->xid = d->xid;
 761
 762         /* add DHCP options or BOOTP extensions */
 763 #ifdef IPCONFIG_DHCP
 764         if (ic_proto_enabled & IC_USE_DHCP)
 765                 ic_dhcp_init_options(b->exten);
 766         else
 767 #endif
 768                 ic_bootp_init_ext(b->exten);
 769
 770         /* Chain packet down the line... */
 771         skb->dev = dev;
 772         skb->protocol = htons(ETH_P_IP);
 773         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
 774                             dev->broadcast, dev->dev_addr, skb->len) < 0 ||
 775             dev_queue_xmit(skb) < 0)
 776                 printk("E");
 777 }
 778
 779
 780 /*
 781  *  Copy BOOTP-supplied string if not already set.
 782  */
 783 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
 784 {
 785         if (!len)
 786                 return 0;
 787         if (len > max-1)
 788                 len = max-1;
 789         memcpy(dest, src, len);
 790         dest[len] = '\0';
 791         return 1;
 792 }
 793
 794
 795 /*
 796  *  Process BOOTP extensions.
 797  */
 798 static void __init ic_do_bootp_ext(u8 *ext)
 799 {
 800        u8 servers;
 801        int i;
 802
 803 #ifdef IPCONFIG_DEBUG
 804         u8 *c;
 805
 806         printk("DHCP/BOOTP: Got extension %d:",*ext);
 807         for (c=ext+2; c<ext+2+ext[1]; c++)
 808                 printk(" %02x", *c);
 809         printk("\n");
 810 #endif
 811
 812         switch (*ext++) {
 813                 case 1:         /* Subnet mask */
 814                         if (ic_netmask == NONE)
 815                                 memcpy(&ic_netmask, ext+1, 4);
 816                         break;
 817                 case 3:         /* Default gateway */
 818                         if (ic_gateway == NONE)
 819                                 memcpy(&ic_gateway, ext+1, 4);
 820                         break;
 821                 case 6:         /* DNS server */
 822                         servers= *ext/4;
 823                         if (servers > CONF_NAMESERVERS_MAX)
 824                                 servers = CONF_NAMESERVERS_MAX;
 825                         for (i = 0; i < servers; i++) {
 826                                 if (ic_nameservers[i] == NONE)
 827                                         memcpy(&ic_nameservers[i], ext+1+4*i, 4);
 828                         }
 829                         break;
 830                 case 12:        /* Host name */
 831                         ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
 832                         ic_host_name_set = 1;
 833                         break;
 834                 case 15:        /* Domain name (DNS) */
 835                         ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
 836                         break;
 837                 case 17:        /* Root path */
 838                         if (!root_server_path[0])
 839                                 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
 840                         break;
 841                 case 40:        /* NIS Domain name (_not_ DNS) */
 842                         ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
 843                         break;
 844         }
 845 }
 846
 847
 848 /*
 849  *  Receive BOOTP reply.
 850  */
 851 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 852 {
 853         struct bootp_pkt *b;
 854         struct iphdr *h;
 855         struct ic_device *d;
 856         int len, ext_len;
 857
 858         if (dev->nd_net != &init_net)
 859                 goto drop;
 860
 861         /* Perform verifications before taking the lock.  */
 862         if (skb->pkt_type == PACKET_OTHERHOST)
 863                 goto drop;
 864
 865         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 866                 return NET_RX_DROP;
 867
 868         if (!pskb_may_pull(skb,
 869                            sizeof(struct iphdr) +
 870                            sizeof(struct udphdr)))
 871                 goto drop;
 872
 873         b = (struct bootp_pkt *)skb_network_header(skb);
 874         h = &b->iph;
 875
 876         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
 877                 goto drop;
 878
 879         /* Fragments are not supported */
 880         if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
 881                 if (net_ratelimit())
 882                         printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
 883                                "reply.\n");
 884                 goto drop;
 885         }
 886
 887         if (skb->len < ntohs(h->tot_len))
 888                 goto drop;
 889
 890         if (ip_fast_csum((char *) h, h->ihl))
 891                 goto drop;
 892
 893         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
 894                 goto drop;
 895
 896         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
 897                 goto drop;
 898
 899         len = ntohs(b->udph.len) - sizeof(struct udphdr);
 900         ext_len = len - (sizeof(*b) -
 901                          sizeof(struct iphdr) -
 902                          sizeof(struct udphdr) -
 903                          sizeof(b->exten));
 904         if (ext_len < 0)
 905                 goto drop;
 906
 907         /* Ok the front looks good, make sure we can get at the rest.  */
 908         if (!pskb_may_pull(skb, skb->len))
 909                 goto drop;
 910
 911         b = (struct bootp_pkt *)skb_network_header(skb);
 912         h = &b->iph;
 913
 914         /* One reply at a time, please. */
 915         spin_lock(&ic_recv_lock);
 916
 917         /* If we already have a reply, just drop the packet */
 918         if (ic_got_reply)
 919                 goto drop_unlock;
 920
 921         /* Find the ic_device that the packet arrived on */
 922         d = ic_first_dev;
 923         while (d && d->dev != dev)
 924                 d = d->next;
 925         if (!d)
 926                 goto drop_unlock;  /* should never happen */
 927
 928         /* Is it a reply to our BOOTP request? */
 929         if (b->op != BOOTP_REPLY ||
 930             b->xid != d->xid) {
 931                 if (net_ratelimit())
 932                         printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
 933                                "op[%x] xid[%x]\n",
 934                                b->op, b->xid);
 935                 goto drop_unlock;
 936         }
 937
 938         /* Parse extensions */
 939         if (ext_len >= 4 &&
 940             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
 941                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
 942                 u8 *ext;
 943
 944 #ifdef IPCONFIG_DHCP
 945                 if (ic_proto_enabled & IC_USE_DHCP) {
 946                         __be32 server_id = NONE;
 947                         int mt = 0;
 948
 949                         ext = &b->exten[4];
 950                         while (ext < end && *ext != 0xff) {
 951                                 u8 *opt = ext++;
 952                                 if (*opt == 0)  /* Padding */
 953                                         continue;
 954                                 ext += *ext + 1;
 955                                 if (ext >= end)
 956                                         break;
 957                                 switch (*opt) {
 958                                 case 53:        /* Message type */
 959                                         if (opt[1])
 960                                                 mt = opt[2];
 961                                         break;
 962                                 case 54:        /* Server ID (IP address) */
 963                                         if (opt[1] >= 4)
 964                                                 memcpy(&server_id, opt + 2, 4);
 965                                         break;
 966                                 }
 967                         }
 968
 969 #ifdef IPCONFIG_DEBUG
 970                         printk("DHCP: Got message type %d\n", mt);
 971 #endif
 972
 973                         switch (mt) {
 974                         case DHCPOFFER:
 975                                 /* While in the process of accepting one offer,
 976                                  * ignore all others.
 977                                  */
 978                                 if (ic_myaddr != NONE)
 979                                         goto drop_unlock;
 980
 981                                 /* Let's accept that offer. */
 982                                 ic_myaddr = b->your_ip;
 983                                 ic_servaddr = server_id;
 984 #ifdef IPCONFIG_DEBUG
 985                                 printk("DHCP: Offered address %u.%u.%u.%u",
 986                                        NIPQUAD(ic_myaddr));
 987                                 printk(" by server %u.%u.%u.%u\n",
 988                                        NIPQUAD(ic_servaddr));
 989 #endif
 990                                 /* The DHCP indicated server address takes
 991                                  * precedence over the bootp header one if
 992                                  * they are different.
 993                                  */
 994                                 if ((server_id != NONE) &&
 995                                     (b->server_ip != server_id))
 996                                         b->server_ip = ic_servaddr;
 997                                 break;
 998
 999                         case DHCPACK:
1000                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1001                                         goto drop_unlock;
1002
1003                                 /* Yeah! */
1004                                 break;
1005
1006                         default:
1007                                 /* Urque.  Forget it*/
1008                                 ic_myaddr = NONE;
1009                                 ic_servaddr = NONE;
1010                                 goto drop_unlock;
1011                         }
1012
1013                         ic_dhcp_msgtype = mt;
1014
1015                 }
1016 #endif /* IPCONFIG_DHCP */
1017
1018                 ext = &b->exten[4];
1019                 while (ext < end && *ext != 0xff) {
1020                         u8 *opt = ext++;
1021                         if (*opt == 0)  /* Padding */
1022                                 continue;
1023                         ext += *ext + 1;
1024                         if (ext < end)
1025                                 ic_do_bootp_ext(opt);
1026                 }
1027         }
1028
1029         /* We have a winner! */
1030         ic_dev = dev;
1031         ic_myaddr = b->your_ip;
1032         ic_servaddr = b->server_ip;
1033         if (ic_gateway == NONE && b->relay_ip)
1034                 ic_gateway = b->relay_ip;
1035         if (ic_nameservers[0] == NONE)
1036                 ic_nameservers[0] = ic_servaddr;
1037         ic_got_reply = IC_BOOTP;
1038
1039 drop_unlock:
1040         /* Show's over.  Nothing to see here.  */
1041         spin_unlock(&ic_recv_lock);
1042
1043 drop:
1044         /* Throw the packet out. */
1045         kfree_skb(skb);
1046
1047         return 0;
1048 }
1049
1050
1051 #endif
1052
1053
1054 /*
1055  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1056  */
1057
1058 #ifdef IPCONFIG_DYNAMIC
1059
1060 static int __init ic_dynamic(void)
1061 {
1062         int retries;
1063         struct ic_device *d;
1064         unsigned long start_jiffies, timeout, jiff;
1065         int do_bootp = ic_proto_have_if & IC_BOOTP;
1066         int do_rarp = ic_proto_have_if & IC_RARP;
1067
1068         /*
1069          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1070          * This routine gets only called when some pieces of information
1071          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1072          */
1073         if (!ic_proto_enabled) {
1074                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1075                 return -1;
1076         }
1077
1078 #ifdef IPCONFIG_BOOTP
1079         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1080                 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1081 #endif
1082 #ifdef IPCONFIG_RARP
1083         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1084                 printk(KERN_ERR "RARP: No suitable device found.\n");
1085 #endif
1086
1087         if (!ic_proto_have_if)
1088                 /* Error message already printed */
1089                 return -1;
1090
1091         /*
1092          * Setup protocols
1093          */
1094 #ifdef IPCONFIG_BOOTP
1095         if (do_bootp)
1096                 ic_bootp_init();
1097 #endif
1098 #ifdef IPCONFIG_RARP
1099         if (do_rarp)
1100                 ic_rarp_init();
1101 #endif
1102
1103         /*
1104          * Send requests and wait, until we get an answer. This loop
1105          * seems to be a terrible waste of CPU time, but actually there is
1106          * only one process running at all, so we don't need to use any
1107          * scheduler functions.
1108          * [Actually we could now, but the nothing else running note still
1109          *  applies.. - AC]
1110          */
1111         printk(KERN_NOTICE "Sending %s%s%s requests .",
1112                do_bootp
1113                 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1114                (do_bootp && do_rarp) ? " and " : "",
1115                do_rarp ? "RARP" : "");
1116
1117         start_jiffies = jiffies;
1118         d = ic_first_dev;
1119         retries = CONF_SEND_RETRIES;
1120         get_random_bytes(&timeout, sizeof(timeout));
1121         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1122         for (;;) {
1123 #ifdef IPCONFIG_BOOTP
1124                 if (do_bootp && (d->able & IC_BOOTP))
1125                         ic_bootp_send_if(d, jiffies - start_jiffies);
1126 #endif
1127 #ifdef IPCONFIG_RARP
1128                 if (do_rarp && (d->able & IC_RARP))
1129                         ic_rarp_send_if(d);
1130 #endif
1131
1132                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1133                 while (time_before(jiffies, jiff) && !ic_got_reply)
1134                         schedule_timeout_uninterruptible(1);
1135 #ifdef IPCONFIG_DHCP
1136                 /* DHCP isn't done until we get a DHCPACK. */
1137                 if ((ic_got_reply & IC_BOOTP)
1138                     && (ic_proto_enabled & IC_USE_DHCP)
1139                     && ic_dhcp_msgtype != DHCPACK)
1140                 {
1141                         ic_got_reply = 0;
1142                         printk(",");
1143                         continue;
1144                 }
1145 #endif /* IPCONFIG_DHCP */
1146
1147                 if (ic_got_reply) {
1148                         printk(" OK\n");
1149                         break;
1150                 }
1151
1152                 if ((d = d->next))
1153                         continue;
1154
1155                 if (! --retries) {
1156                         printk(" timed out!\n");
1157                         break;
1158                 }
1159
1160                 d = ic_first_dev;
1161
1162                 timeout = timeout CONF_TIMEOUT_MULT;
1163                 if (timeout > CONF_TIMEOUT_MAX)
1164                         timeout = CONF_TIMEOUT_MAX;
1165
1166                 printk(".");
1167         }
1168
1169 #ifdef IPCONFIG_BOOTP
1170         if (do_bootp)
1171                 ic_bootp_cleanup();
1172 #endif
1173 #ifdef IPCONFIG_RARP
1174         if (do_rarp)
1175                 ic_rarp_cleanup();
1176 #endif
1177
1178         if (!ic_got_reply) {
1179                 ic_myaddr = NONE;
1180                 return -1;
1181         }
1182
1183         printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
1184                 ((ic_got_reply & IC_RARP) ? "RARP"
1185                  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1186                 NIPQUAD(ic_servaddr));
1187         printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
1188
1189         return 0;
1190 }
1191
1192 #endif /* IPCONFIG_DYNAMIC */
1193
1194 #ifdef CONFIG_PROC_FS
1195
1196 static int pnp_seq_show(struct seq_file *seq, void *v)
1197 {
1198         int i;
1199
1200         if (ic_proto_used & IC_PROTO)
1201                 seq_printf(seq, "#PROTO: %s\n",
1202                            (ic_proto_used & IC_RARP) ? "RARP"
1203                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1204         else
1205                 seq_puts(seq, "#MANUAL\n");
1206
1207         if (ic_domain[0])
1208                 seq_printf(seq,
1209                            "domain %s\n", ic_domain);
1210         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1211                 if (ic_nameservers[i] != NONE)
1212                         seq_printf(seq,
1213                                    "nameserver %u.%u.%u.%u\n",
1214                                    NIPQUAD(ic_nameservers[i]));
1215         }
1216         if (ic_servaddr != NONE)
1217                 seq_printf(seq,
1218                            "bootserver %u.%u.%u.%u\n",
1219                            NIPQUAD(ic_servaddr));
1220         return 0;
1221 }
1222
1223 static int pnp_seq_open(struct inode *indoe, struct file *file)
1224 {
1225         return single_open(file, pnp_seq_show, NULL);
1226 }
1227
1228 static const struct file_operations pnp_seq_fops = {
1229         .owner          = THIS_MODULE,
1230         .open           = pnp_seq_open,
1231         .read           = seq_read,
1232         .llseek         = seq_lseek,
1233         .release        = single_release,
1234 };
1235 #endif /* CONFIG_PROC_FS */
1236
1237 /*
1238  *  Extract IP address from the parameter string if needed. Note that we
1239  *  need to have root_server_addr set _before_ IPConfig gets called as it
1240  *  can override it.
1241  */
1242 __be32 __init root_nfs_parse_addr(char *name)
1243 {
1244         __be32 addr;
1245         int octets = 0;
1246         char *cp, *cq;
1247
1248         cp = cq = name;
1249         while (octets < 4) {
1250                 while (*cp >= '0' && *cp <= '9')
1251                         cp++;
1252                 if (cp == cq || cp - cq > 3)
1253                         break;
1254                 if (*cp == '.' || octets == 3)
1255                         octets++;
1256                 if (octets < 4)
1257                         cp++;
1258                 cq = cp;
1259         }
1260         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1261                 if (*cp == ':')
1262                         *cp++ = '\0';
1263                 addr = in_aton(name);
1264                 memmove(name, cp, strlen(cp) + 1);
1265         } else
1266                 addr = NONE;
1267
1268         return addr;
1269 }
1270
1271 /*
1272  *      IP Autoconfig dispatcher.
1273  */
1274
1275 static int __init ip_auto_config(void)
1276 {
1277         __be32 addr;
1278
1279 #ifdef CONFIG_PROC_FS
1280         proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1281 #endif /* CONFIG_PROC_FS */
1282
1283         if (!ic_enable)
1284                 return 0;
1285
1286         DBG(("IP-Config: Entered.\n"));
1287 #ifdef IPCONFIG_DYNAMIC
1288  try_try_again:
1289 #endif
1290         /* Give hardware a chance to settle */
1291         msleep(CONF_PRE_OPEN);
1292
1293         /* Setup all network devices */
1294         if (ic_open_devs() < 0)
1295                 return -1;
1296
1297         /* Give drivers a chance to settle */
1298         ssleep(CONF_POST_OPEN);
1299
1300         /*
1301          * If the config information is insufficient (e.g., our IP address or
1302          * IP address of the boot server is missing or we have multiple network
1303          * interfaces and no default was set), use BOOTP or RARP to get the
1304          * missing values.
1305          */
1306         if (ic_myaddr == NONE ||
1307 #ifdef CONFIG_ROOT_NFS
1308             (root_server_addr == NONE
1309              && ic_servaddr == NONE
1310              && ROOT_DEV == Root_NFS) ||
1311 #endif
1312             ic_first_dev->next) {
1313 #ifdef IPCONFIG_DYNAMIC
1314
1315                 int retries = CONF_OPEN_RETRIES;
1316
1317                 if (ic_dynamic() < 0) {
1318                         ic_close_devs();
1319
1320                         /*
1321                          * I don't know why, but sometimes the
1322                          * eepro100 driver (at least) gets upset and
1323                          * doesn't work the first time it's opened.
1324                          * But then if you close it and reopen it, it
1325                          * works just fine.  So we need to try that at
1326                          * least once before giving up.
1327                          *
1328                          * Also, if the root will be NFS-mounted, we
1329                          * have nowhere to go if DHCP fails.  So we
1330                          * just have to keep trying forever.
1331                          *
1332                          *                              -- Chip
1333                          */
1334 #ifdef CONFIG_ROOT_NFS
1335                         if (ROOT_DEV ==  Root_NFS) {
1336                                 printk(KERN_ERR
1337                                         "IP-Config: Retrying forever (NFS root)...\n");
1338                                 goto try_try_again;
1339                         }
1340 #endif
1341
1342                         if (--retries) {
1343                                 printk(KERN_ERR
1344                                        "IP-Config: Reopening network devices...\n");
1345                                 goto try_try_again;
1346                         }
1347
1348                         /* Oh, well.  At least we tried. */
1349                         printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1350                         return -1;
1351                 }
1352 #else /* !DYNAMIC */
1353                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1354                 ic_close_devs();
1355                 return -1;
1356 #endif /* IPCONFIG_DYNAMIC */
1357         } else {
1358                 /* Device selected manually or only one device -> use it */
1359                 ic_dev = ic_first_dev->dev;
1360         }
1361
1362         addr = root_nfs_parse_addr(root_server_path);
1363         if (root_server_addr == NONE)
1364                 root_server_addr = addr;
1365
1366         /*
1367          * Use defaults whereever applicable.
1368          */
1369         if (ic_defaults() < 0)
1370                 return -1;
1371
1372         /*
1373          * Close all network devices except the device we've
1374          * autoconfigured and set up routes.
1375          */
1376         ic_close_devs();
1377         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1378                 return -1;
1379
1380         /*
1381          * Record which protocol was actually used.
1382          */
1383 #ifdef IPCONFIG_DYNAMIC
1384         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1385 #endif
1386
1387 #ifndef IPCONFIG_SILENT
1388         /*
1389          * Clue in the operator.
1390          */
1391         printk("IP-Config: Complete:");
1392         printk("\n      device=%s", ic_dev->name);
1393         printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
1394         printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
1395         printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
1396         printk(",\n     host=%s, domain=%s, nis-domain=%s",
1397                utsname()->nodename, ic_domain, utsname()->domainname);
1398         printk(",\n     bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
1399         printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
1400         printk(", rootpath=%s", root_server_path);
1401         printk("\n");
1402 #endif /* !SILENT */
1403
1404         return 0;
1405 }
1406
1407 late_initcall(ip_auto_config);
1408
1409
1410 /*
1411  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1412  *  command line parameter.  See Documentation/nfsroot.txt.
1413  */
1414 static int __init ic_proto_name(char *name)
1415 {
1416         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1417                 return 1;
1418         }
1419         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1420                 return 0;
1421         }
1422 #ifdef CONFIG_IP_PNP_DHCP
1423         else if (!strcmp(name, "dhcp")) {
1424                 ic_proto_enabled &= ~IC_RARP;
1425                 return 1;
1426         }
1427 #endif
1428 #ifdef CONFIG_IP_PNP_BOOTP
1429         else if (!strcmp(name, "bootp")) {
1430                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1431                 return 1;
1432         }
1433 #endif
1434 #ifdef CONFIG_IP_PNP_RARP
1435         else if (!strcmp(name, "rarp")) {
1436                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1437                 return 1;
1438         }
1439 #endif
1440 #ifdef IPCONFIG_DYNAMIC
1441         else if (!strcmp(name, "both")) {
1442                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1443                 return 1;
1444         }
1445 #endif
1446         return 0;
1447 }
1448
1449 static int __init ip_auto_config_setup(char *addrs)
1450 {
1451         char *cp, *ip, *dp;
1452         int num = 0;
1453
1454         ic_set_manually = 1;
1455         ic_enable = 1;
1456
1457         /*
1458          * If any dhcp, bootp etc options are set, leave autoconfig on
1459          * and skip the below static IP processing.
1460          */
1461         if (ic_proto_name(addrs))
1462                 return 1;
1463
1464         /* If no static IP is given, turn off autoconfig and bail.  */
1465         if (*addrs == 0 ||
1466             strcmp(addrs, "off") == 0 ||
1467             strcmp(addrs, "none") == 0) {
1468                 ic_enable = 0;
1469                 return 1;
1470         }
1471
1472         /* Parse string for static IP assignment.  */
1473         ip = addrs;
1474         while (ip && *ip) {
1475                 if ((cp = strchr(ip, ':')))
1476                         *cp++ = '\0';
1477                 if (strlen(ip) > 0) {
1478                         DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1479                         switch (num) {
1480                         case 0:
1481                                 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY)
1482                                         ic_myaddr = NONE;
1483                                 break;
1484                         case 1:
1485                                 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
1486                                         ic_servaddr = NONE;
1487                                 break;
1488                         case 2:
1489                                 if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
1490                                         ic_gateway = NONE;
1491                                 break;
1492                         case 3:
1493                                 if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
1494                                         ic_netmask = NONE;
1495                                 break;
1496                         case 4:
1497                                 if ((dp = strchr(ip, '.'))) {
1498                                         *dp++ = '\0';
1499                                         strlcpy(utsname()->domainname, dp,
1500                                                 sizeof(utsname()->domainname));
1501                                 }
1502                                 strlcpy(utsname()->nodename, ip,
1503                                         sizeof(utsname()->nodename));
1504                                 ic_host_name_set = 1;
1505                                 break;
1506                         case 5:
1507                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1508                                 break;
1509                         case 6:
1510                                 if (ic_proto_name(ip) == 0 &&
1511                                     ic_myaddr == NONE) {
1512                                         ic_enable = 0;
1513                                 }
1514                                 break;
1515                         }
1516                 }
1517                 ip = cp;
1518                 num++;
1519         }
1520
1521         return 1;
1522 }
1523
1524 static int __init nfsaddrs_config_setup(char *addrs)
1525 {
1526         return ip_auto_config_setup(addrs);
1527 }
1528
1529 static int __init vendor_class_identifier_setup(char *addrs)
1530 {
1531         if (strlcpy(vendor_class_identifier, addrs,
1532                     sizeof(vendor_class_identifier))
1533             >= sizeof(vendor_class_identifier))
1534                 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1535                        vendor_class_identifier);
1536         return 1;
1537 }
1538
1539 __setup("ip=", ip_auto_config_setup);
1540 __setup("nfsaddrs=", nfsaddrs_config_setup);
1541 __setup("dhcpclass=", vendor_class_identifier_setup);