git.oblomov.eu Git - linux-2.6/blob - net/ipv4/ipconfig.c

   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 #define ANY __constant_htonl(INADDR_ANY)
 107
 108 /*
 109  * Public IP configuration
 110  */
 111
 112 /* This is used by platforms which might be able to set the ipconfig
 113  * variables using firmware environment vars.  If this is set, it will
 114  * ignore such firmware variables.
 115  */
 116 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
 117
 118 static int ic_enable __initdata = 0;            /* IP config enabled? */
 119
 120 /* Protocol choice */
 121 int ic_proto_enabled __initdata = 0
 122 #ifdef IPCONFIG_BOOTP
 123                         | IC_BOOTP
 124 #endif
 125 #ifdef CONFIG_IP_PNP_DHCP
 126                         | IC_USE_DHCP
 127 #endif
 128 #ifdef IPCONFIG_RARP
 129                         | IC_RARP
 130 #endif
 131                         ;
 132
 133 static int ic_host_name_set __initdata = 0;     /* Host name set by us? */
 134
 135 __be32 ic_myaddr = NONE;                /* My IP address */
 136 static __be32 ic_netmask = NONE;        /* Netmask for local subnet */
 137 __be32 ic_gateway = NONE;       /* Gateway IP address */
 138
 139 __be32 ic_servaddr = NONE;      /* Boot server IP address */
 140
 141 __be32 root_server_addr = NONE; /* Address of NFS server */
 142 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
 143
 144 /* vendor class identifier */
 145 static char vendor_class_identifier[253] __initdata;
 146
 147 /* Persistent data: */
 148
 149 static int ic_proto_used;                       /* Protocol used, if any */
 150 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
 151 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
 152
 153 /*
 154  * Private state.
 155  */
 156
 157 /* Name of user-selected boot device */
 158 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
 159
 160 /* Protocols supported by available interfaces */
 161 static int ic_proto_have_if __initdata = 0;
 162
 163 #ifdef IPCONFIG_DYNAMIC
 164 static DEFINE_SPINLOCK(ic_recv_lock);
 165 static volatile int ic_got_reply __initdata = 0;    /* Proto(s) that replied */
 166 #endif
 167 #ifdef IPCONFIG_DHCP
 168 static int ic_dhcp_msgtype __initdata = 0;      /* DHCP msg type received */
 169 #endif
 170
 171
 172 /*
 173  *      Network devices
 174  */
 175
 176 struct ic_device {
 177         struct ic_device *next;
 178         struct net_device *dev;
 179         unsigned short flags;
 180         short able;
 181         __be32 xid;
 182 };
 183
 184 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
 185 static struct net_device *ic_dev __initdata = NULL;     /* Selected device */
 186
 187 static int __init ic_open_devs(void)
 188 {
 189         struct ic_device *d, **last;
 190         struct net_device *dev;
 191         unsigned short oflags;
 192
 193         last = &ic_first_dev;
 194         rtnl_lock();
 195
 196         /* bring loopback device up first */
 197         for_each_netdev(&init_net, dev) {
 198                 if (!(dev->flags & IFF_LOOPBACK))
 199                         continue;
 200                 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
 201                         printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
 202         }
 203
 204         for_each_netdev(&init_net, dev) {
 205                 if (dev->flags & IFF_LOOPBACK)
 206                         continue;
 207                 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
 208                     (!(dev->flags & IFF_LOOPBACK) &&
 209                      (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
 210                      strncmp(dev->name, "dummy", 5))) {
 211                         int able = 0;
 212                         if (dev->mtu >= 364)
 213                                 able |= IC_BOOTP;
 214                         else
 215                                 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
 216                         if (!(dev->flags & IFF_NOARP))
 217                                 able |= IC_RARP;
 218                         able &= ic_proto_enabled;
 219                         if (ic_proto_enabled && !able)
 220                                 continue;
 221                         oflags = dev->flags;
 222                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
 223                                 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
 224                                 continue;
 225                         }
 226                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
 227                                 rtnl_unlock();
 228                                 return -1;
 229                         }
 230                         d->dev = dev;
 231                         *last = d;
 232                         last = &d->next;
 233                         d->flags = oflags;
 234                         d->able = able;
 235                         if (able & IC_BOOTP)
 236                                 get_random_bytes(&d->xid, sizeof(__be32));
 237                         else
 238                                 d->xid = 0;
 239                         ic_proto_have_if |= able;
 240                         DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
 241                                 dev->name, able, d->xid));
 242                 }
 243         }
 244         rtnl_unlock();
 245
 246         *last = NULL;
 247
 248         if (!ic_first_dev) {
 249                 if (user_dev_name[0])
 250                         printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
 251                 else
 252                         printk(KERN_ERR "IP-Config: No network devices available.\n");
 253                 return -1;
 254         }
 255         return 0;
 256 }
 257
 258 static void __init ic_close_devs(void)
 259 {
 260         struct ic_device *d, *next;
 261         struct net_device *dev;
 262
 263         rtnl_lock();
 264         next = ic_first_dev;
 265         while ((d = next)) {
 266                 next = d->next;
 267                 dev = d->dev;
 268                 if (dev != ic_dev) {
 269                         DBG(("IP-Config: Downing %s\n", dev->name));
 270                         dev_change_flags(dev, d->flags);
 271                 }
 272                 kfree(d);
 273         }
 274         rtnl_unlock();
 275 }
 276
 277 /*
 278  *      Interface to various network functions.
 279  */
 280
 281 static inline void
 282 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
 283 {
 284         sin->sin_family = AF_INET;
 285         sin->sin_addr.s_addr = addr;
 286         sin->sin_port = port;
 287 }
 288
 289 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
 290 {
 291         int res;
 292
 293         mm_segment_t oldfs = get_fs();
 294         set_fs(get_ds());
 295         res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
 296         set_fs(oldfs);
 297         return res;
 298 }
 299
 300 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
 301 {
 302         int res;
 303
 304         mm_segment_t oldfs = get_fs();
 305         set_fs(get_ds());
 306         res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
 307         set_fs(oldfs);
 308         return res;
 309 }
 310
 311 /*
 312  *      Set up interface addresses and routes.
 313  */
 314
 315 static int __init ic_setup_if(void)
 316 {
 317         struct ifreq ir;
 318         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
 319         int err;
 320
 321         memset(&ir, 0, sizeof(ir));
 322         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
 323         set_sockaddr(sin, ic_myaddr, 0);
 324         if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
 325                 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
 326                 return -1;
 327         }
 328         set_sockaddr(sin, ic_netmask, 0);
 329         if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
 330                 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
 331                 return -1;
 332         }
 333         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
 334         if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
 335                 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
 336                 return -1;
 337         }
 338         return 0;
 339 }
 340
 341 static int __init ic_setup_routes(void)
 342 {
 343         /* No need to setup device routes, only the default route... */
 344
 345         if (ic_gateway != NONE) {
 346                 struct rtentry rm;
 347                 int err;
 348
 349                 memset(&rm, 0, sizeof(rm));
 350                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
 351                         printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
 352                         return -1;
 353                 }
 354                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
 355                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
 356                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
 357                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
 358                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
 359                         printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
 360                         return -1;
 361                 }
 362         }
 363
 364         return 0;
 365 }
 366
 367 /*
 368  *      Fill in default values for all missing parameters.
 369  */
 370
 371 static int __init ic_defaults(void)
 372 {
 373         /*
 374          *      At this point we have no userspace running so need not
 375          *      claim locks on system_utsname
 376          */
 377
 378         if (!ic_host_name_set)
 379                 sprintf(init_utsname()->nodename, NIPQUAD_FMT, NIPQUAD(ic_myaddr));
 380
 381         if (root_server_addr == NONE)
 382                 root_server_addr = ic_servaddr;
 383
 384         if (ic_netmask == NONE) {
 385                 if (IN_CLASSA(ntohl(ic_myaddr)))
 386                         ic_netmask = htonl(IN_CLASSA_NET);
 387                 else if (IN_CLASSB(ntohl(ic_myaddr)))
 388                         ic_netmask = htonl(IN_CLASSB_NET);
 389                 else if (IN_CLASSC(ntohl(ic_myaddr)))
 390                         ic_netmask = htonl(IN_CLASSC_NET);
 391                 else {
 392                         printk(KERN_ERR "IP-Config: Unable to guess netmask for address " NIPQUAD_FMT "\n",
 393                                 NIPQUAD(ic_myaddr));
 394                         return -1;
 395                 }
 396                 printk("IP-Config: Guessing netmask " NIPQUAD_FMT "\n", NIPQUAD(ic_netmask));
 397         }
 398
 399         return 0;
 400 }
 401
 402 /*
 403  *      RARP support.
 404  */
 405
 406 #ifdef IPCONFIG_RARP
 407
 408 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 409
 410 static struct packet_type rarp_packet_type __initdata = {
 411         .type = __constant_htons(ETH_P_RARP),
 412         .func = ic_rarp_recv,
 413 };
 414
 415 static inline void ic_rarp_init(void)
 416 {
 417         dev_add_pack(&rarp_packet_type);
 418 }
 419
 420 static inline void ic_rarp_cleanup(void)
 421 {
 422         dev_remove_pack(&rarp_packet_type);
 423 }
 424
 425 /*
 426  *  Process received RARP packet.
 427  */
 428 static int __init
 429 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 430 {
 431         struct arphdr *rarp;
 432         unsigned char *rarp_ptr;
 433         __be32 sip, tip;
 434         unsigned char *sha, *tha;               /* s for "source", t for "target" */
 435         struct ic_device *d;
 436
 437         if (dev_net(dev) != &init_net)
 438                 goto drop;
 439
 440         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 441                 return NET_RX_DROP;
 442
 443         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
 444                 goto drop;
 445
 446         /* Basic sanity checks can be done without the lock.  */
 447         rarp = (struct arphdr *)skb_transport_header(skb);
 448
 449         /* If this test doesn't pass, it's not IP, or we should
 450          * ignore it anyway.
 451          */
 452         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
 453                 goto drop;
 454
 455         /* If it's not a RARP reply, delete it. */
 456         if (rarp->ar_op != htons(ARPOP_RREPLY))
 457                 goto drop;
 458
 459         /* If it's not Ethernet, delete it. */
 460         if (rarp->ar_pro != htons(ETH_P_IP))
 461                 goto drop;
 462
 463         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
 464                 goto drop;
 465
 466         /* OK, it is all there and looks valid, process... */
 467         rarp = (struct arphdr *)skb_transport_header(skb);
 468         rarp_ptr = (unsigned char *) (rarp + 1);
 469
 470         /* One reply at a time, please. */
 471         spin_lock(&ic_recv_lock);
 472
 473         /* If we already have a reply, just drop the packet */
 474         if (ic_got_reply)
 475                 goto drop_unlock;
 476
 477         /* Find the ic_device that the packet arrived on */
 478         d = ic_first_dev;
 479         while (d && d->dev != dev)
 480                 d = d->next;
 481         if (!d)
 482                 goto drop_unlock;       /* should never happen */
 483
 484         /* Extract variable-width fields */
 485         sha = rarp_ptr;
 486         rarp_ptr += dev->addr_len;
 487         memcpy(&sip, rarp_ptr, 4);
 488         rarp_ptr += 4;
 489         tha = rarp_ptr;
 490         rarp_ptr += dev->addr_len;
 491         memcpy(&tip, rarp_ptr, 4);
 492
 493         /* Discard packets which are not meant for us. */
 494         if (memcmp(tha, dev->dev_addr, dev->addr_len))
 495                 goto drop_unlock;
 496
 497         /* Discard packets which are not from specified server. */
 498         if (ic_servaddr != NONE && ic_servaddr != sip)
 499                 goto drop_unlock;
 500
 501         /* We have a winner! */
 502         ic_dev = dev;
 503         if (ic_myaddr == NONE)
 504                 ic_myaddr = tip;
 505         ic_servaddr = sip;
 506         ic_got_reply = IC_RARP;
 507
 508 drop_unlock:
 509         /* Show's over.  Nothing to see here.  */
 510         spin_unlock(&ic_recv_lock);
 511
 512 drop:
 513         /* Throw the packet out. */
 514         kfree_skb(skb);
 515         return 0;
 516 }
 517
 518
 519 /*
 520  *  Send RARP request packet over a single interface.
 521  */
 522 static void __init ic_rarp_send_if(struct ic_device *d)
 523 {
 524         struct net_device *dev = d->dev;
 525         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
 526                  dev->dev_addr, dev->dev_addr);
 527 }
 528 #endif
 529
 530 /*
 531  *      DHCP/BOOTP support.
 532  */
 533
 534 #ifdef IPCONFIG_BOOTP
 535
 536 struct bootp_pkt {              /* BOOTP packet format */
 537         struct iphdr iph;       /* IP header */
 538         struct udphdr udph;     /* UDP header */
 539         u8 op;                  /* 1=request, 2=reply */
 540         u8 htype;               /* HW address type */
 541         u8 hlen;                /* HW address length */
 542         u8 hops;                /* Used only by gateways */
 543         __be32 xid;             /* Transaction ID */
 544         __be16 secs;            /* Seconds since we started */
 545         __be16 flags;           /* Just what it says */
 546         __be32 client_ip;               /* Client's IP address if known */
 547         __be32 your_ip;         /* Assigned IP address */
 548         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
 549         __be32 relay_ip;                /* IP address of BOOTP relay */
 550         u8 hw_addr[16];         /* Client's HW address */
 551         u8 serv_name[64];       /* Server host name */
 552         u8 boot_file[128];      /* Name of boot file */
 553         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
 554 };
 555
 556 /* packet ops */
 557 #define BOOTP_REQUEST   1
 558 #define BOOTP_REPLY     2
 559
 560 /* DHCP message types */
 561 #define DHCPDISCOVER    1
 562 #define DHCPOFFER       2
 563 #define DHCPREQUEST     3
 564 #define DHCPDECLINE     4
 565 #define DHCPACK         5
 566 #define DHCPNAK         6
 567 #define DHCPRELEASE     7
 568 #define DHCPINFORM      8
 569
 570 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 571
 572 static struct packet_type bootp_packet_type __initdata = {
 573         .type = __constant_htons(ETH_P_IP),
 574         .func = ic_bootp_recv,
 575 };
 576
 577
 578 /*
 579  *  Initialize DHCP/BOOTP extension fields in the request.
 580  */
 581
 582 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
 583
 584 #ifdef IPCONFIG_DHCP
 585
 586 static void __init
 587 ic_dhcp_init_options(u8 *options)
 588 {
 589         u8 mt = ((ic_servaddr == NONE)
 590                  ? DHCPDISCOVER : DHCPREQUEST);
 591         u8 *e = options;
 592         int len;
 593
 594 #ifdef IPCONFIG_DEBUG
 595         printk("DHCP: Sending message type %d\n", mt);
 596 #endif
 597
 598         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 599         e += 4;
 600
 601         *e++ = 53;              /* DHCP message type */
 602         *e++ = 1;
 603         *e++ = mt;
 604
 605         if (mt == DHCPREQUEST) {
 606                 *e++ = 54;      /* Server ID (IP address) */
 607                 *e++ = 4;
 608                 memcpy(e, &ic_servaddr, 4);
 609                 e += 4;
 610
 611                 *e++ = 50;      /* Requested IP address */
 612                 *e++ = 4;
 613                 memcpy(e, &ic_myaddr, 4);
 614                 e += 4;
 615         }
 616
 617         /* always? */
 618         {
 619                 static const u8 ic_req_params[] = {
 620                         1,      /* Subnet mask */
 621                         3,      /* Default gateway */
 622                         6,      /* DNS server */
 623                         12,     /* Host name */
 624                         15,     /* Domain name */
 625                         17,     /* Boot path */
 626                         40,     /* NIS domain name */
 627                 };
 628
 629                 *e++ = 55;      /* Parameter request list */
 630                 *e++ = sizeof(ic_req_params);
 631                 memcpy(e, ic_req_params, sizeof(ic_req_params));
 632                 e += sizeof(ic_req_params);
 633
 634                 if (*vendor_class_identifier) {
 635                         printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
 636                                vendor_class_identifier);
 637                         *e++ = 60;      /* Class-identifier */
 638                         len = strlen(vendor_class_identifier);
 639                         *e++ = len;
 640                         memcpy(e, vendor_class_identifier, len);
 641                         e += len;
 642                 }
 643         }
 644
 645         *e++ = 255;     /* End of the list */
 646 }
 647
 648 #endif /* IPCONFIG_DHCP */
 649
 650 static void __init ic_bootp_init_ext(u8 *e)
 651 {
 652         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 653         e += 4;
 654         *e++ = 1;               /* Subnet mask request */
 655         *e++ = 4;
 656         e += 4;
 657         *e++ = 3;               /* Default gateway request */
 658         *e++ = 4;
 659         e += 4;
 660         *e++ = 5;               /* Name server request */
 661         *e++ = 8;
 662         e += 8;
 663         *e++ = 12;              /* Host name request */
 664         *e++ = 32;
 665         e += 32;
 666         *e++ = 40;              /* NIS Domain name request */
 667         *e++ = 32;
 668         e += 32;
 669         *e++ = 17;              /* Boot path */
 670         *e++ = 40;
 671         e += 40;
 672
 673         *e++ = 57;              /* set extension buffer size for reply */
 674         *e++ = 2;
 675         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
 676         *e++ = 150;
 677
 678         *e++ = 255;             /* End of the list */
 679 }
 680
 681
 682 /*
 683  *  Initialize the DHCP/BOOTP mechanism.
 684  */
 685 static inline void ic_bootp_init(void)
 686 {
 687         int i;
 688
 689         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
 690                 ic_nameservers[i] = NONE;
 691
 692         dev_add_pack(&bootp_packet_type);
 693 }
 694
 695
 696 /*
 697  *  DHCP/BOOTP cleanup.
 698  */
 699 static inline void ic_bootp_cleanup(void)
 700 {
 701         dev_remove_pack(&bootp_packet_type);
 702 }
 703
 704
 705 /*
 706  *  Send DHCP/BOOTP request to single interface.
 707  */
 708 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
 709 {
 710         struct net_device *dev = d->dev;
 711         struct sk_buff *skb;
 712         struct bootp_pkt *b;
 713         int hh_len = LL_RESERVED_SPACE(dev);
 714         struct iphdr *h;
 715
 716         /* Allocate packet */
 717         skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
 718         if (!skb)
 719                 return;
 720         skb_reserve(skb, hh_len);
 721         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
 722         memset(b, 0, sizeof(struct bootp_pkt));
 723
 724         /* Construct IP header */
 725         skb_reset_network_header(skb);
 726         h = ip_hdr(skb);
 727         h->version = 4;
 728         h->ihl = 5;
 729         h->tot_len = htons(sizeof(struct bootp_pkt));
 730         h->frag_off = htons(IP_DF);
 731         h->ttl = 64;
 732         h->protocol = IPPROTO_UDP;
 733         h->daddr = htonl(INADDR_BROADCAST);
 734         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
 735
 736         /* Construct UDP header */
 737         b->udph.source = htons(68);
 738         b->udph.dest = htons(67);
 739         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
 740         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
 741
 742         /* Construct DHCP/BOOTP header */
 743         b->op = BOOTP_REQUEST;
 744         if (dev->type < 256) /* check for false types */
 745                 b->htype = dev->type;
 746         else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
 747                 b->htype = ARPHRD_IEEE802;
 748         else if (dev->type == ARPHRD_FDDI)
 749                 b->htype = ARPHRD_ETHER;
 750         else {
 751                 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
 752                 b->htype = dev->type; /* can cause undefined behavior */
 753         }
 754
 755         /* server_ip and your_ip address are both already zero per RFC2131 */
 756         b->hlen = dev->addr_len;
 757         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
 758         b->secs = htons(jiffies_diff / HZ);
 759         b->xid = d->xid;
 760
 761         /* add DHCP options or BOOTP extensions */
 762 #ifdef IPCONFIG_DHCP
 763         if (ic_proto_enabled & IC_USE_DHCP)
 764                 ic_dhcp_init_options(b->exten);
 765         else
 766 #endif
 767                 ic_bootp_init_ext(b->exten);
 768
 769         /* Chain packet down the line... */
 770         skb->dev = dev;
 771         skb->protocol = htons(ETH_P_IP);
 772         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
 773                             dev->broadcast, dev->dev_addr, skb->len) < 0 ||
 774             dev_queue_xmit(skb) < 0)
 775                 printk("E");
 776 }
 777
 778
 779 /*
 780  *  Copy BOOTP-supplied string if not already set.
 781  */
 782 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
 783 {
 784         if (!len)
 785                 return 0;
 786         if (len > max-1)
 787                 len = max-1;
 788         memcpy(dest, src, len);
 789         dest[len] = '\0';
 790         return 1;
 791 }
 792
 793
 794 /*
 795  *  Process BOOTP extensions.
 796  */
 797 static void __init ic_do_bootp_ext(u8 *ext)
 798 {
 799        u8 servers;
 800        int i;
 801
 802 #ifdef IPCONFIG_DEBUG
 803         u8 *c;
 804
 805         printk("DHCP/BOOTP: Got extension %d:",*ext);
 806         for (c=ext+2; c<ext+2+ext[1]; c++)
 807                 printk(" %02x", *c);
 808         printk("\n");
 809 #endif
 810
 811         switch (*ext++) {
 812                 case 1:         /* Subnet mask */
 813                         if (ic_netmask == NONE)
 814                                 memcpy(&ic_netmask, ext+1, 4);
 815                         break;
 816                 case 3:         /* Default gateway */
 817                         if (ic_gateway == NONE)
 818                                 memcpy(&ic_gateway, ext+1, 4);
 819                         break;
 820                 case 6:         /* DNS server */
 821                         servers= *ext/4;
 822                         if (servers > CONF_NAMESERVERS_MAX)
 823                                 servers = CONF_NAMESERVERS_MAX;
 824                         for (i = 0; i < servers; i++) {
 825                                 if (ic_nameservers[i] == NONE)
 826                                         memcpy(&ic_nameservers[i], ext+1+4*i, 4);
 827                         }
 828                         break;
 829                 case 12:        /* Host name */
 830                         ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
 831                         ic_host_name_set = 1;
 832                         break;
 833                 case 15:        /* Domain name (DNS) */
 834                         ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
 835                         break;
 836                 case 17:        /* Root path */
 837                         if (!root_server_path[0])
 838                                 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
 839                         break;
 840                 case 40:        /* NIS Domain name (_not_ DNS) */
 841                         ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
 842                         break;
 843         }
 844 }
 845
 846
 847 /*
 848  *  Receive BOOTP reply.
 849  */
 850 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 851 {
 852         struct bootp_pkt *b;
 853         struct iphdr *h;
 854         struct ic_device *d;
 855         int len, ext_len;
 856
 857         if (dev_net(dev) != &init_net)
 858                 goto drop;
 859
 860         /* Perform verifications before taking the lock.  */
 861         if (skb->pkt_type == PACKET_OTHERHOST)
 862                 goto drop;
 863
 864         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 865                 return NET_RX_DROP;
 866
 867         if (!pskb_may_pull(skb,
 868                            sizeof(struct iphdr) +
 869                            sizeof(struct udphdr)))
 870                 goto drop;
 871
 872         b = (struct bootp_pkt *)skb_network_header(skb);
 873         h = &b->iph;
 874
 875         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
 876                 goto drop;
 877
 878         /* Fragments are not supported */
 879         if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
 880                 if (net_ratelimit())
 881                         printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
 882                                "reply.\n");
 883                 goto drop;
 884         }
 885
 886         if (skb->len < ntohs(h->tot_len))
 887                 goto drop;
 888
 889         if (ip_fast_csum((char *) h, h->ihl))
 890                 goto drop;
 891
 892         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
 893                 goto drop;
 894
 895         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
 896                 goto drop;
 897
 898         len = ntohs(b->udph.len) - sizeof(struct udphdr);
 899         ext_len = len - (sizeof(*b) -
 900                          sizeof(struct iphdr) -
 901                          sizeof(struct udphdr) -
 902                          sizeof(b->exten));
 903         if (ext_len < 0)
 904                 goto drop;
 905
 906         /* Ok the front looks good, make sure we can get at the rest.  */
 907         if (!pskb_may_pull(skb, skb->len))
 908                 goto drop;
 909
 910         b = (struct bootp_pkt *)skb_network_header(skb);
 911         h = &b->iph;
 912
 913         /* One reply at a time, please. */
 914         spin_lock(&ic_recv_lock);
 915
 916         /* If we already have a reply, just drop the packet */
 917         if (ic_got_reply)
 918                 goto drop_unlock;
 919
 920         /* Find the ic_device that the packet arrived on */
 921         d = ic_first_dev;
 922         while (d && d->dev != dev)
 923                 d = d->next;
 924         if (!d)
 925                 goto drop_unlock;  /* should never happen */
 926
 927         /* Is it a reply to our BOOTP request? */
 928         if (b->op != BOOTP_REPLY ||
 929             b->xid != d->xid) {
 930                 if (net_ratelimit())
 931                         printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
 932                                "op[%x] xid[%x]\n",
 933                                b->op, b->xid);
 934                 goto drop_unlock;
 935         }
 936
 937         /* Parse extensions */
 938         if (ext_len >= 4 &&
 939             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
 940                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
 941                 u8 *ext;
 942
 943 #ifdef IPCONFIG_DHCP
 944                 if (ic_proto_enabled & IC_USE_DHCP) {
 945                         __be32 server_id = NONE;
 946                         int mt = 0;
 947
 948                         ext = &b->exten[4];
 949                         while (ext < end && *ext != 0xff) {
 950                                 u8 *opt = ext++;
 951                                 if (*opt == 0)  /* Padding */
 952                                         continue;
 953                                 ext += *ext + 1;
 954                                 if (ext >= end)
 955                                         break;
 956                                 switch (*opt) {
 957                                 case 53:        /* Message type */
 958                                         if (opt[1])
 959                                                 mt = opt[2];
 960                                         break;
 961                                 case 54:        /* Server ID (IP address) */
 962                                         if (opt[1] >= 4)
 963                                                 memcpy(&server_id, opt + 2, 4);
 964                                         break;
 965                                 }
 966                         }
 967
 968 #ifdef IPCONFIG_DEBUG
 969                         printk("DHCP: Got message type %d\n", mt);
 970 #endif
 971
 972                         switch (mt) {
 973                         case DHCPOFFER:
 974                                 /* While in the process of accepting one offer,
 975                                  * ignore all others.
 976                                  */
 977                                 if (ic_myaddr != NONE)
 978                                         goto drop_unlock;
 979
 980                                 /* Let's accept that offer. */
 981                                 ic_myaddr = b->your_ip;
 982                                 ic_servaddr = server_id;
 983 #ifdef IPCONFIG_DEBUG
 984                                 printk("DHCP: Offered address " NIPQUAD_FMT,
 985                                        NIPQUAD(ic_myaddr));
 986                                 printk(" by server " NIPQUAD_FMT "\n",
 987                                        NIPQUAD(ic_servaddr));
 988 #endif
 989                                 /* The DHCP indicated server address takes
 990                                  * precedence over the bootp header one if
 991                                  * they are different.
 992                                  */
 993                                 if ((server_id != NONE) &&
 994                                     (b->server_ip != server_id))
 995                                         b->server_ip = ic_servaddr;
 996                                 break;
 997
 998                         case DHCPACK:
 999                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1000                                         goto drop_unlock;
1001
1002                                 /* Yeah! */
1003                                 break;
1004
1005                         default:
1006                                 /* Urque.  Forget it*/
1007                                 ic_myaddr = NONE;
1008                                 ic_servaddr = NONE;
1009                                 goto drop_unlock;
1010                         }
1011
1012                         ic_dhcp_msgtype = mt;
1013
1014                 }
1015 #endif /* IPCONFIG_DHCP */
1016
1017                 ext = &b->exten[4];
1018                 while (ext < end && *ext != 0xff) {
1019                         u8 *opt = ext++;
1020                         if (*opt == 0)  /* Padding */
1021                                 continue;
1022                         ext += *ext + 1;
1023                         if (ext < end)
1024                                 ic_do_bootp_ext(opt);
1025                 }
1026         }
1027
1028         /* We have a winner! */
1029         ic_dev = dev;
1030         ic_myaddr = b->your_ip;
1031         ic_servaddr = b->server_ip;
1032         if (ic_gateway == NONE && b->relay_ip)
1033                 ic_gateway = b->relay_ip;
1034         if (ic_nameservers[0] == NONE)
1035                 ic_nameservers[0] = ic_servaddr;
1036         ic_got_reply = IC_BOOTP;
1037
1038 drop_unlock:
1039         /* Show's over.  Nothing to see here.  */
1040         spin_unlock(&ic_recv_lock);
1041
1042 drop:
1043         /* Throw the packet out. */
1044         kfree_skb(skb);
1045
1046         return 0;
1047 }
1048
1049
1050 #endif
1051
1052
1053 /*
1054  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1055  */
1056
1057 #ifdef IPCONFIG_DYNAMIC
1058
1059 static int __init ic_dynamic(void)
1060 {
1061         int retries;
1062         struct ic_device *d;
1063         unsigned long start_jiffies, timeout, jiff;
1064         int do_bootp = ic_proto_have_if & IC_BOOTP;
1065         int do_rarp = ic_proto_have_if & IC_RARP;
1066
1067         /*
1068          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1069          * This routine gets only called when some pieces of information
1070          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1071          */
1072         if (!ic_proto_enabled) {
1073                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1074                 return -1;
1075         }
1076
1077 #ifdef IPCONFIG_BOOTP
1078         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1079                 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1080 #endif
1081 #ifdef IPCONFIG_RARP
1082         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1083                 printk(KERN_ERR "RARP: No suitable device found.\n");
1084 #endif
1085
1086         if (!ic_proto_have_if)
1087                 /* Error message already printed */
1088                 return -1;
1089
1090         /*
1091          * Setup protocols
1092          */
1093 #ifdef IPCONFIG_BOOTP
1094         if (do_bootp)
1095                 ic_bootp_init();
1096 #endif
1097 #ifdef IPCONFIG_RARP
1098         if (do_rarp)
1099                 ic_rarp_init();
1100 #endif
1101
1102         /*
1103          * Send requests and wait, until we get an answer. This loop
1104          * seems to be a terrible waste of CPU time, but actually there is
1105          * only one process running at all, so we don't need to use any
1106          * scheduler functions.
1107          * [Actually we could now, but the nothing else running note still
1108          *  applies.. - AC]
1109          */
1110         printk(KERN_NOTICE "Sending %s%s%s requests .",
1111                do_bootp
1112                 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1113                (do_bootp && do_rarp) ? " and " : "",
1114                do_rarp ? "RARP" : "");
1115
1116         start_jiffies = jiffies;
1117         d = ic_first_dev;
1118         retries = CONF_SEND_RETRIES;
1119         get_random_bytes(&timeout, sizeof(timeout));
1120         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1121         for (;;) {
1122 #ifdef IPCONFIG_BOOTP
1123                 if (do_bootp && (d->able & IC_BOOTP))
1124                         ic_bootp_send_if(d, jiffies - start_jiffies);
1125 #endif
1126 #ifdef IPCONFIG_RARP
1127                 if (do_rarp && (d->able & IC_RARP))
1128                         ic_rarp_send_if(d);
1129 #endif
1130
1131                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1132                 while (time_before(jiffies, jiff) && !ic_got_reply)
1133                         schedule_timeout_uninterruptible(1);
1134 #ifdef IPCONFIG_DHCP
1135                 /* DHCP isn't done until we get a DHCPACK. */
1136                 if ((ic_got_reply & IC_BOOTP)
1137                     && (ic_proto_enabled & IC_USE_DHCP)
1138                     && ic_dhcp_msgtype != DHCPACK)
1139                 {
1140                         ic_got_reply = 0;
1141                         printk(",");
1142                         continue;
1143                 }
1144 #endif /* IPCONFIG_DHCP */
1145
1146                 if (ic_got_reply) {
1147                         printk(" OK\n");
1148                         break;
1149                 }
1150
1151                 if ((d = d->next))
1152                         continue;
1153
1154                 if (! --retries) {
1155                         printk(" timed out!\n");
1156                         break;
1157                 }
1158
1159                 d = ic_first_dev;
1160
1161                 timeout = timeout CONF_TIMEOUT_MULT;
1162                 if (timeout > CONF_TIMEOUT_MAX)
1163                         timeout = CONF_TIMEOUT_MAX;
1164
1165                 printk(".");
1166         }
1167
1168 #ifdef IPCONFIG_BOOTP
1169         if (do_bootp)
1170                 ic_bootp_cleanup();
1171 #endif
1172 #ifdef IPCONFIG_RARP
1173         if (do_rarp)
1174                 ic_rarp_cleanup();
1175 #endif
1176
1177         if (!ic_got_reply) {
1178                 ic_myaddr = NONE;
1179                 return -1;
1180         }
1181
1182         printk("IP-Config: Got %s answer from " NIPQUAD_FMT ", ",
1183                 ((ic_got_reply & IC_RARP) ? "RARP"
1184                  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1185                 NIPQUAD(ic_servaddr));
1186         printk("my address is " NIPQUAD_FMT "\n", NIPQUAD(ic_myaddr));
1187
1188         return 0;
1189 }
1190
1191 #endif /* IPCONFIG_DYNAMIC */
1192
1193 #ifdef CONFIG_PROC_FS
1194
1195 static int pnp_seq_show(struct seq_file *seq, void *v)
1196 {
1197         int i;
1198
1199         if (ic_proto_used & IC_PROTO)
1200                 seq_printf(seq, "#PROTO: %s\n",
1201                            (ic_proto_used & IC_RARP) ? "RARP"
1202                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1203         else
1204                 seq_puts(seq, "#MANUAL\n");
1205
1206         if (ic_domain[0])
1207                 seq_printf(seq,
1208                            "domain %s\n", ic_domain);
1209         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1210                 if (ic_nameservers[i] != NONE)
1211                         seq_printf(seq,
1212                                    "nameserver " NIPQUAD_FMT "\n",
1213                                    NIPQUAD(ic_nameservers[i]));
1214         }
1215         if (ic_servaddr != NONE)
1216                 seq_printf(seq,
1217                            "bootserver " NIPQUAD_FMT "\n",
1218                            NIPQUAD(ic_servaddr));
1219         return 0;
1220 }
1221
1222 static int pnp_seq_open(struct inode *indoe, struct file *file)
1223 {
1224         return single_open(file, pnp_seq_show, NULL);
1225 }
1226
1227 static const struct file_operations pnp_seq_fops = {
1228         .owner          = THIS_MODULE,
1229         .open           = pnp_seq_open,
1230         .read           = seq_read,
1231         .llseek         = seq_lseek,
1232         .release        = single_release,
1233 };
1234 #endif /* CONFIG_PROC_FS */
1235
1236 /*
1237  *  Extract IP address from the parameter string if needed. Note that we
1238  *  need to have root_server_addr set _before_ IPConfig gets called as it
1239  *  can override it.
1240  */
1241 __be32 __init root_nfs_parse_addr(char *name)
1242 {
1243         __be32 addr;
1244         int octets = 0;
1245         char *cp, *cq;
1246
1247         cp = cq = name;
1248         while (octets < 4) {
1249                 while (*cp >= '0' && *cp <= '9')
1250                         cp++;
1251                 if (cp == cq || cp - cq > 3)
1252                         break;
1253                 if (*cp == '.' || octets == 3)
1254                         octets++;
1255                 if (octets < 4)
1256                         cp++;
1257                 cq = cp;
1258         }
1259         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1260                 if (*cp == ':')
1261                         *cp++ = '\0';
1262                 addr = in_aton(name);
1263                 memmove(name, cp, strlen(cp) + 1);
1264         } else
1265                 addr = NONE;
1266
1267         return addr;
1268 }
1269
1270 /*
1271  *      IP Autoconfig dispatcher.
1272  */
1273
1274 static int __init ip_auto_config(void)
1275 {
1276         __be32 addr;
1277
1278 #ifdef CONFIG_PROC_FS
1279         proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1280 #endif /* CONFIG_PROC_FS */
1281
1282         if (!ic_enable)
1283                 return 0;
1284
1285         DBG(("IP-Config: Entered.\n"));
1286 #ifdef IPCONFIG_DYNAMIC
1287  try_try_again:
1288 #endif
1289         /* Give hardware a chance to settle */
1290         msleep(CONF_PRE_OPEN);
1291
1292         /* Setup all network devices */
1293         if (ic_open_devs() < 0)
1294                 return -1;
1295
1296         /* Give drivers a chance to settle */
1297         ssleep(CONF_POST_OPEN);
1298
1299         /*
1300          * If the config information is insufficient (e.g., our IP address or
1301          * IP address of the boot server is missing or we have multiple network
1302          * interfaces and no default was set), use BOOTP or RARP to get the
1303          * missing values.
1304          */
1305         if (ic_myaddr == NONE ||
1306 #ifdef CONFIG_ROOT_NFS
1307             (root_server_addr == NONE
1308              && ic_servaddr == NONE
1309              && ROOT_DEV == Root_NFS) ||
1310 #endif
1311             ic_first_dev->next) {
1312 #ifdef IPCONFIG_DYNAMIC
1313
1314                 int retries = CONF_OPEN_RETRIES;
1315
1316                 if (ic_dynamic() < 0) {
1317                         ic_close_devs();
1318
1319                         /*
1320                          * I don't know why, but sometimes the
1321                          * eepro100 driver (at least) gets upset and
1322                          * doesn't work the first time it's opened.
1323                          * But then if you close it and reopen it, it
1324                          * works just fine.  So we need to try that at
1325                          * least once before giving up.
1326                          *
1327                          * Also, if the root will be NFS-mounted, we
1328                          * have nowhere to go if DHCP fails.  So we
1329                          * just have to keep trying forever.
1330                          *
1331                          *                              -- Chip
1332                          */
1333 #ifdef CONFIG_ROOT_NFS
1334                         if (ROOT_DEV ==  Root_NFS) {
1335                                 printk(KERN_ERR
1336                                         "IP-Config: Retrying forever (NFS root)...\n");
1337                                 goto try_try_again;
1338                         }
1339 #endif
1340
1341                         if (--retries) {
1342                                 printk(KERN_ERR
1343                                        "IP-Config: Reopening network devices...\n");
1344                                 goto try_try_again;
1345                         }
1346
1347                         /* Oh, well.  At least we tried. */
1348                         printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1349                         return -1;
1350                 }
1351 #else /* !DYNAMIC */
1352                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1353                 ic_close_devs();
1354                 return -1;
1355 #endif /* IPCONFIG_DYNAMIC */
1356         } else {
1357                 /* Device selected manually or only one device -> use it */
1358                 ic_dev = ic_first_dev->dev;
1359         }
1360
1361         addr = root_nfs_parse_addr(root_server_path);
1362         if (root_server_addr == NONE)
1363                 root_server_addr = addr;
1364
1365         /*
1366          * Use defaults whereever applicable.
1367          */
1368         if (ic_defaults() < 0)
1369                 return -1;
1370
1371         /*
1372          * Close all network devices except the device we've
1373          * autoconfigured and set up routes.
1374          */
1375         ic_close_devs();
1376         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1377                 return -1;
1378
1379         /*
1380          * Record which protocol was actually used.
1381          */
1382 #ifdef IPCONFIG_DYNAMIC
1383         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1384 #endif
1385
1386 #ifndef IPCONFIG_SILENT
1387         /*
1388          * Clue in the operator.
1389          */
1390         printk("IP-Config: Complete:");
1391         printk("\n     device=%s", ic_dev->name);
1392         printk(", addr=" NIPQUAD_FMT, NIPQUAD(ic_myaddr));
1393         printk(", mask=" NIPQUAD_FMT, NIPQUAD(ic_netmask));
1394         printk(", gw=" NIPQUAD_FMT, NIPQUAD(ic_gateway));
1395         printk(",\n     host=%s, domain=%s, nis-domain=%s",
1396                utsname()->nodename, ic_domain, utsname()->domainname);
1397         printk(",\n     bootserver=" NIPQUAD_FMT, NIPQUAD(ic_servaddr));
1398         printk(", rootserver=" NIPQUAD_FMT, NIPQUAD(root_server_addr));
1399         printk(", rootpath=%s", root_server_path);
1400         printk("\n");
1401 #endif /* !SILENT */
1402
1403         return 0;
1404 }
1405
1406 late_initcall(ip_auto_config);
1407
1408
1409 /*
1410  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1411  *  command line parameter.  See Documentation/filesystems/nfsroot.txt.
1412  */
1413 static int __init ic_proto_name(char *name)
1414 {
1415         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1416                 return 1;
1417         }
1418         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1419                 return 0;
1420         }
1421 #ifdef CONFIG_IP_PNP_DHCP
1422         else if (!strcmp(name, "dhcp")) {
1423                 ic_proto_enabled &= ~IC_RARP;
1424                 return 1;
1425         }
1426 #endif
1427 #ifdef CONFIG_IP_PNP_BOOTP
1428         else if (!strcmp(name, "bootp")) {
1429                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1430                 return 1;
1431         }
1432 #endif
1433 #ifdef CONFIG_IP_PNP_RARP
1434         else if (!strcmp(name, "rarp")) {
1435                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1436                 return 1;
1437         }
1438 #endif
1439 #ifdef IPCONFIG_DYNAMIC
1440         else if (!strcmp(name, "both")) {
1441                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1442                 return 1;
1443         }
1444 #endif
1445         return 0;
1446 }
1447
1448 static int __init ip_auto_config_setup(char *addrs)
1449 {
1450         char *cp, *ip, *dp;
1451         int num = 0;
1452
1453         ic_set_manually = 1;
1454         ic_enable = 1;
1455
1456         /*
1457          * If any dhcp, bootp etc options are set, leave autoconfig on
1458          * and skip the below static IP processing.
1459          */
1460         if (ic_proto_name(addrs))
1461                 return 1;
1462
1463         /* If no static IP is given, turn off autoconfig and bail.  */
1464         if (*addrs == 0 ||
1465             strcmp(addrs, "off") == 0 ||
1466             strcmp(addrs, "none") == 0) {
1467                 ic_enable = 0;
1468                 return 1;
1469         }
1470
1471         /* Parse string for static IP assignment.  */
1472         ip = addrs;
1473         while (ip && *ip) {
1474                 if ((cp = strchr(ip, ':')))
1475                         *cp++ = '\0';
1476                 if (strlen(ip) > 0) {
1477                         DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1478                         switch (num) {
1479                         case 0:
1480                                 if ((ic_myaddr = in_aton(ip)) == ANY)
1481                                         ic_myaddr = NONE;
1482                                 break;
1483                         case 1:
1484                                 if ((ic_servaddr = in_aton(ip)) == ANY)
1485                                         ic_servaddr = NONE;
1486                                 break;
1487                         case 2:
1488                                 if ((ic_gateway = in_aton(ip)) == ANY)
1489                                         ic_gateway = NONE;
1490                                 break;
1491                         case 3:
1492                                 if ((ic_netmask = in_aton(ip)) == ANY)
1493                                         ic_netmask = NONE;
1494                                 break;
1495                         case 4:
1496                                 if ((dp = strchr(ip, '.'))) {
1497                                         *dp++ = '\0';
1498                                         strlcpy(utsname()->domainname, dp,
1499                                                 sizeof(utsname()->domainname));
1500                                 }
1501                                 strlcpy(utsname()->nodename, ip,
1502                                         sizeof(utsname()->nodename));
1503                                 ic_host_name_set = 1;
1504                                 break;
1505                         case 5:
1506                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1507                                 break;
1508                         case 6:
1509                                 if (ic_proto_name(ip) == 0 &&
1510                                     ic_myaddr == NONE) {
1511                                         ic_enable = 0;
1512                                 }
1513                                 break;
1514                         }
1515                 }
1516                 ip = cp;
1517                 num++;
1518         }
1519
1520         return 1;
1521 }
1522
1523 static int __init nfsaddrs_config_setup(char *addrs)
1524 {
1525         return ip_auto_config_setup(addrs);
1526 }
1527
1528 static int __init vendor_class_identifier_setup(char *addrs)
1529 {
1530         if (strlcpy(vendor_class_identifier, addrs,
1531                     sizeof(vendor_class_identifier))
1532             >= sizeof(vendor_class_identifier))
1533                 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1534                        vendor_class_identifier);
1535         return 1;
1536 }
1537
1538 __setup("ip=", ip_auto_config_setup);
1539 __setup("nfsaddrs=", nfsaddrs_config_setup);
1540 __setup("dhcpclass=", vendor_class_identifier_setup);