err.no 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(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, "%u.%u.%u.%u", 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 %u.%u.%u.%u\n",
 393                                 NIPQUAD(ic_myaddr));
 394                         return -1;
 395                 }
 396                 printk("IP-Config: Guessing netmask %u.%u.%u.%u\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->nd_net != &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,
 464                            sizeof(struct arphdr) +
 465                            (2 * dev->addr_len) +
 466                            (2 * 4)))
 467                 goto drop;
 468
 469         /* OK, it is all there and looks valid, process... */
 470         rarp = (struct arphdr *)skb_transport_header(skb);
 471         rarp_ptr = (unsigned char *) (rarp + 1);
 472
 473         /* One reply at a time, please. */
 474         spin_lock(&ic_recv_lock);
 475
 476         /* If we already have a reply, just drop the packet */
 477         if (ic_got_reply)
 478                 goto drop_unlock;
 479
 480         /* Find the ic_device that the packet arrived on */
 481         d = ic_first_dev;
 482         while (d && d->dev != dev)
 483                 d = d->next;
 484         if (!d)
 485                 goto drop_unlock;       /* should never happen */
 486
 487         /* Extract variable-width fields */
 488         sha = rarp_ptr;
 489         rarp_ptr += dev->addr_len;
 490         memcpy(&sip, rarp_ptr, 4);
 491         rarp_ptr += 4;
 492         tha = rarp_ptr;
 493         rarp_ptr += dev->addr_len;
 494         memcpy(&tip, rarp_ptr, 4);
 495
 496         /* Discard packets which are not meant for us. */
 497         if (memcmp(tha, dev->dev_addr, dev->addr_len))
 498                 goto drop_unlock;
 499
 500         /* Discard packets which are not from specified server. */
 501         if (ic_servaddr != NONE && ic_servaddr != sip)
 502                 goto drop_unlock;
 503
 504         /* We have a winner! */
 505         ic_dev = dev;
 506         if (ic_myaddr == NONE)
 507                 ic_myaddr = tip;
 508         ic_servaddr = sip;
 509         ic_got_reply = IC_RARP;
 510
 511 drop_unlock:
 512         /* Show's over.  Nothing to see here.  */
 513         spin_unlock(&ic_recv_lock);
 514
 515 drop:
 516         /* Throw the packet out. */
 517         kfree_skb(skb);
 518         return 0;
 519 }
 520
 521
 522 /*
 523  *  Send RARP request packet over a single interface.
 524  */
 525 static void __init ic_rarp_send_if(struct ic_device *d)
 526 {
 527         struct net_device *dev = d->dev;
 528         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
 529                  dev->dev_addr, dev->dev_addr);
 530 }
 531 #endif
 532
 533 /*
 534  *      DHCP/BOOTP support.
 535  */
 536
 537 #ifdef IPCONFIG_BOOTP
 538
 539 struct bootp_pkt {              /* BOOTP packet format */
 540         struct iphdr iph;       /* IP header */
 541         struct udphdr udph;     /* UDP header */
 542         u8 op;                  /* 1=request, 2=reply */
 543         u8 htype;               /* HW address type */
 544         u8 hlen;                /* HW address length */
 545         u8 hops;                /* Used only by gateways */
 546         __be32 xid;             /* Transaction ID */
 547         __be16 secs;            /* Seconds since we started */
 548         __be16 flags;           /* Just what it says */
 549         __be32 client_ip;               /* Client's IP address if known */
 550         __be32 your_ip;         /* Assigned IP address */
 551         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
 552         __be32 relay_ip;                /* IP address of BOOTP relay */
 553         u8 hw_addr[16];         /* Client's HW address */
 554         u8 serv_name[64];       /* Server host name */
 555         u8 boot_file[128];      /* Name of boot file */
 556         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
 557 };
 558
 559 /* packet ops */
 560 #define BOOTP_REQUEST   1
 561 #define BOOTP_REPLY     2
 562
 563 /* DHCP message types */
 564 #define DHCPDISCOVER    1
 565 #define DHCPOFFER       2
 566 #define DHCPREQUEST     3
 567 #define DHCPDECLINE     4
 568 #define DHCPACK         5
 569 #define DHCPNAK         6
 570 #define DHCPRELEASE     7
 571 #define DHCPINFORM      8
 572
 573 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 574
 575 static struct packet_type bootp_packet_type __initdata = {
 576         .type = __constant_htons(ETH_P_IP),
 577         .func = ic_bootp_recv,
 578 };
 579
 580
 581 /*
 582  *  Initialize DHCP/BOOTP extension fields in the request.
 583  */
 584
 585 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
 586
 587 #ifdef IPCONFIG_DHCP
 588
 589 static void __init
 590 ic_dhcp_init_options(u8 *options)
 591 {
 592         u8 mt = ((ic_servaddr == NONE)
 593                  ? DHCPDISCOVER : DHCPREQUEST);
 594         u8 *e = options;
 595         int len;
 596
 597 #ifdef IPCONFIG_DEBUG
 598         printk("DHCP: Sending message type %d\n", mt);
 599 #endif
 600
 601         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 602         e += 4;
 603
 604         *e++ = 53;              /* DHCP message type */
 605         *e++ = 1;
 606         *e++ = mt;
 607
 608         if (mt == DHCPREQUEST) {
 609                 *e++ = 54;      /* Server ID (IP address) */
 610                 *e++ = 4;
 611                 memcpy(e, &ic_servaddr, 4);
 612                 e += 4;
 613
 614                 *e++ = 50;      /* Requested IP address */
 615                 *e++ = 4;
 616                 memcpy(e, &ic_myaddr, 4);
 617                 e += 4;
 618         }
 619
 620         /* always? */
 621         {
 622                 static const u8 ic_req_params[] = {
 623                         1,      /* Subnet mask */
 624                         3,      /* Default gateway */
 625                         6,      /* DNS server */
 626                         12,     /* Host name */
 627                         15,     /* Domain name */
 628                         17,     /* Boot path */
 629                         40,     /* NIS domain name */
 630                 };
 631
 632                 *e++ = 55;      /* Parameter request list */
 633                 *e++ = sizeof(ic_req_params);
 634                 memcpy(e, ic_req_params, sizeof(ic_req_params));
 635                 e += sizeof(ic_req_params);
 636
 637                 if (*vendor_class_identifier) {
 638                         printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
 639                                vendor_class_identifier);
 640                         *e++ = 60;      /* Class-identifier */
 641                         len = strlen(vendor_class_identifier);
 642                         *e++ = len;
 643                         memcpy(e, vendor_class_identifier, len);
 644                         e += len;
 645                 }
 646         }
 647
 648         *e++ = 255;     /* End of the list */
 649 }
 650
 651 #endif /* IPCONFIG_DHCP */
 652
 653 static void __init ic_bootp_init_ext(u8 *e)
 654 {
 655         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 656         e += 4;
 657         *e++ = 1;               /* Subnet mask request */
 658         *e++ = 4;
 659         e += 4;
 660         *e++ = 3;               /* Default gateway request */
 661         *e++ = 4;
 662         e += 4;
 663         *e++ = 5;               /* Name server request */
 664         *e++ = 8;
 665         e += 8;
 666         *e++ = 12;              /* Host name request */
 667         *e++ = 32;
 668         e += 32;
 669         *e++ = 40;              /* NIS Domain name request */
 670         *e++ = 32;
 671         e += 32;
 672         *e++ = 17;              /* Boot path */
 673         *e++ = 40;
 674         e += 40;
 675
 676         *e++ = 57;              /* set extension buffer size for reply */
 677         *e++ = 2;
 678         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
 679         *e++ = 150;
 680
 681         *e++ = 255;             /* End of the list */
 682 }
 683
 684
 685 /*
 686  *  Initialize the DHCP/BOOTP mechanism.
 687  */
 688 static inline void ic_bootp_init(void)
 689 {
 690         int i;
 691
 692         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
 693                 ic_nameservers[i] = NONE;
 694
 695         dev_add_pack(&bootp_packet_type);
 696 }
 697
 698
 699 /*
 700  *  DHCP/BOOTP cleanup.
 701  */
 702 static inline void ic_bootp_cleanup(void)
 703 {
 704         dev_remove_pack(&bootp_packet_type);
 705 }
 706
 707
 708 /*
 709  *  Send DHCP/BOOTP request to single interface.
 710  */
 711 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
 712 {
 713         struct net_device *dev = d->dev;
 714         struct sk_buff *skb;
 715         struct bootp_pkt *b;
 716         int hh_len = LL_RESERVED_SPACE(dev);
 717         struct iphdr *h;
 718
 719         /* Allocate packet */
 720         skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
 721         if (!skb)
 722                 return;
 723         skb_reserve(skb, hh_len);
 724         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
 725         memset(b, 0, sizeof(struct bootp_pkt));
 726
 727         /* Construct IP header */
 728         skb_reset_network_header(skb);
 729         h = ip_hdr(skb);
 730         h->version = 4;
 731         h->ihl = 5;
 732         h->tot_len = htons(sizeof(struct bootp_pkt));
 733         h->frag_off = htons(IP_DF);
 734         h->ttl = 64;
 735         h->protocol = IPPROTO_UDP;
 736         h->daddr = htonl(INADDR_BROADCAST);
 737         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
 738
 739         /* Construct UDP header */
 740         b->udph.source = htons(68);
 741         b->udph.dest = htons(67);
 742         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
 743         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
 744
 745         /* Construct DHCP/BOOTP header */
 746         b->op = BOOTP_REQUEST;
 747         if (dev->type < 256) /* check for false types */
 748                 b->htype = dev->type;
 749         else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
 750                 b->htype = ARPHRD_IEEE802;
 751         else if (dev->type == ARPHRD_FDDI)
 752                 b->htype = ARPHRD_ETHER;
 753         else {
 754                 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
 755                 b->htype = dev->type; /* can cause undefined behavior */
 756         }
 757
 758         /* server_ip and your_ip address are both already zero per RFC2131 */
 759         b->hlen = dev->addr_len;
 760         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
 761         b->secs = htons(jiffies_diff / HZ);
 762         b->xid = d->xid;
 763
 764         /* add DHCP options or BOOTP extensions */
 765 #ifdef IPCONFIG_DHCP
 766         if (ic_proto_enabled & IC_USE_DHCP)
 767                 ic_dhcp_init_options(b->exten);
 768         else
 769 #endif
 770                 ic_bootp_init_ext(b->exten);
 771
 772         /* Chain packet down the line... */
 773         skb->dev = dev;
 774         skb->protocol = htons(ETH_P_IP);
 775         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
 776                             dev->broadcast, dev->dev_addr, skb->len) < 0 ||
 777             dev_queue_xmit(skb) < 0)
 778                 printk("E");
 779 }
 780
 781
 782 /*
 783  *  Copy BOOTP-supplied string if not already set.
 784  */
 785 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
 786 {
 787         if (!len)
 788                 return 0;
 789         if (len > max-1)
 790                 len = max-1;
 791         memcpy(dest, src, len);
 792         dest[len] = '\0';
 793         return 1;
 794 }
 795
 796
 797 /*
 798  *  Process BOOTP extensions.
 799  */
 800 static void __init ic_do_bootp_ext(u8 *ext)
 801 {
 802        u8 servers;
 803        int i;
 804
 805 #ifdef IPCONFIG_DEBUG
 806         u8 *c;
 807
 808         printk("DHCP/BOOTP: Got extension %d:",*ext);
 809         for (c=ext+2; c<ext+2+ext[1]; c++)
 810                 printk(" %02x", *c);
 811         printk("\n");
 812 #endif
 813
 814         switch (*ext++) {
 815                 case 1:         /* Subnet mask */
 816                         if (ic_netmask == NONE)
 817                                 memcpy(&ic_netmask, ext+1, 4);
 818                         break;
 819                 case 3:         /* Default gateway */
 820                         if (ic_gateway == NONE)
 821                                 memcpy(&ic_gateway, ext+1, 4);
 822                         break;
 823                 case 6:         /* DNS server */
 824                         servers= *ext/4;
 825                         if (servers > CONF_NAMESERVERS_MAX)
 826                                 servers = CONF_NAMESERVERS_MAX;
 827                         for (i = 0; i < servers; i++) {
 828                                 if (ic_nameservers[i] == NONE)
 829                                         memcpy(&ic_nameservers[i], ext+1+4*i, 4);
 830                         }
 831                         break;
 832                 case 12:        /* Host name */
 833                         ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
 834                         ic_host_name_set = 1;
 835                         break;
 836                 case 15:        /* Domain name (DNS) */
 837                         ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
 838                         break;
 839                 case 17:        /* Root path */
 840                         if (!root_server_path[0])
 841                                 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
 842                         break;
 843                 case 40:        /* NIS Domain name (_not_ DNS) */
 844                         ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
 845                         break;
 846         }
 847 }
 848
 849
 850 /*
 851  *  Receive BOOTP reply.
 852  */
 853 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 854 {
 855         struct bootp_pkt *b;
 856         struct iphdr *h;
 857         struct ic_device *d;
 858         int len, ext_len;
 859
 860         if (dev->nd_net != &init_net)
 861                 goto drop;
 862
 863         /* Perform verifications before taking the lock.  */
 864         if (skb->pkt_type == PACKET_OTHERHOST)
 865                 goto drop;
 866
 867         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 868                 return NET_RX_DROP;
 869
 870         if (!pskb_may_pull(skb,
 871                            sizeof(struct iphdr) +
 872                            sizeof(struct udphdr)))
 873                 goto drop;
 874
 875         b = (struct bootp_pkt *)skb_network_header(skb);
 876         h = &b->iph;
 877
 878         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
 879                 goto drop;
 880
 881         /* Fragments are not supported */
 882         if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
 883                 if (net_ratelimit())
 884                         printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
 885                                "reply.\n");
 886                 goto drop;
 887         }
 888
 889         if (skb->len < ntohs(h->tot_len))
 890                 goto drop;
 891
 892         if (ip_fast_csum((char *) h, h->ihl))
 893                 goto drop;
 894
 895         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
 896                 goto drop;
 897
 898         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
 899                 goto drop;
 900
 901         len = ntohs(b->udph.len) - sizeof(struct udphdr);
 902         ext_len = len - (sizeof(*b) -
 903                          sizeof(struct iphdr) -
 904                          sizeof(struct udphdr) -
 905                          sizeof(b->exten));
 906         if (ext_len < 0)
 907                 goto drop;
 908
 909         /* Ok the front looks good, make sure we can get at the rest.  */
 910         if (!pskb_may_pull(skb, skb->len))
 911                 goto drop;
 912
 913         b = (struct bootp_pkt *)skb_network_header(skb);
 914         h = &b->iph;
 915
 916         /* One reply at a time, please. */
 917         spin_lock(&ic_recv_lock);
 918
 919         /* If we already have a reply, just drop the packet */
 920         if (ic_got_reply)
 921                 goto drop_unlock;
 922
 923         /* Find the ic_device that the packet arrived on */
 924         d = ic_first_dev;
 925         while (d && d->dev != dev)
 926                 d = d->next;
 927         if (!d)
 928                 goto drop_unlock;  /* should never happen */
 929
 930         /* Is it a reply to our BOOTP request? */
 931         if (b->op != BOOTP_REPLY ||
 932             b->xid != d->xid) {
 933                 if (net_ratelimit())
 934                         printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
 935                                "op[%x] xid[%x]\n",
 936                                b->op, b->xid);
 937                 goto drop_unlock;
 938         }
 939
 940         /* Parse extensions */
 941         if (ext_len >= 4 &&
 942             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
 943                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
 944                 u8 *ext;
 945
 946 #ifdef IPCONFIG_DHCP
 947                 if (ic_proto_enabled & IC_USE_DHCP) {
 948                         __be32 server_id = NONE;
 949                         int mt = 0;
 950
 951                         ext = &b->exten[4];
 952                         while (ext < end && *ext != 0xff) {
 953                                 u8 *opt = ext++;
 954                                 if (*opt == 0)  /* Padding */
 955                                         continue;
 956                                 ext += *ext + 1;
 957                                 if (ext >= end)
 958                                         break;
 959                                 switch (*opt) {
 960                                 case 53:        /* Message type */
 961                                         if (opt[1])
 962                                                 mt = opt[2];
 963                                         break;
 964                                 case 54:        /* Server ID (IP address) */
 965                                         if (opt[1] >= 4)
 966                                                 memcpy(&server_id, opt + 2, 4);
 967                                         break;
 968                                 }
 969                         }
 970
 971 #ifdef IPCONFIG_DEBUG
 972                         printk("DHCP: Got message type %d\n", mt);
 973 #endif
 974
 975                         switch (mt) {
 976                         case DHCPOFFER:
 977                                 /* While in the process of accepting one offer,
 978                                  * ignore all others.
 979                                  */
 980                                 if (ic_myaddr != NONE)
 981                                         goto drop_unlock;
 982
 983                                 /* Let's accept that offer. */
 984                                 ic_myaddr = b->your_ip;
 985                                 ic_servaddr = server_id;
 986 #ifdef IPCONFIG_DEBUG
 987                                 printk("DHCP: Offered address %u.%u.%u.%u",
 988                                        NIPQUAD(ic_myaddr));
 989                                 printk(" by server %u.%u.%u.%u\n",
 990                                        NIPQUAD(ic_servaddr));
 991 #endif
 992                                 /* The DHCP indicated server address takes
 993                                  * precedence over the bootp header one if
 994                                  * they are different.
 995                                  */
 996                                 if ((server_id != NONE) &&
 997                                     (b->server_ip != server_id))
 998                                         b->server_ip = ic_servaddr;
 999                                 break;
1000
1001                         case DHCPACK:
1002                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1003                                         goto drop_unlock;
1004
1005                                 /* Yeah! */
1006                                 break;
1007
1008                         default:
1009                                 /* Urque.  Forget it*/
1010                                 ic_myaddr = NONE;
1011                                 ic_servaddr = NONE;
1012                                 goto drop_unlock;
1013                         }
1014
1015                         ic_dhcp_msgtype = mt;
1016
1017                 }
1018 #endif /* IPCONFIG_DHCP */
1019
1020                 ext = &b->exten[4];
1021                 while (ext < end && *ext != 0xff) {
1022                         u8 *opt = ext++;
1023                         if (*opt == 0)  /* Padding */
1024                                 continue;
1025                         ext += *ext + 1;
1026                         if (ext < end)
1027                                 ic_do_bootp_ext(opt);
1028                 }
1029         }
1030
1031         /* We have a winner! */
1032         ic_dev = dev;
1033         ic_myaddr = b->your_ip;
1034         ic_servaddr = b->server_ip;
1035         if (ic_gateway == NONE && b->relay_ip)
1036                 ic_gateway = b->relay_ip;
1037         if (ic_nameservers[0] == NONE)
1038                 ic_nameservers[0] = ic_servaddr;
1039         ic_got_reply = IC_BOOTP;
1040
1041 drop_unlock:
1042         /* Show's over.  Nothing to see here.  */
1043         spin_unlock(&ic_recv_lock);
1044
1045 drop:
1046         /* Throw the packet out. */
1047         kfree_skb(skb);
1048
1049         return 0;
1050 }
1051
1052
1053 #endif
1054
1055
1056 /*
1057  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1058  */
1059
1060 #ifdef IPCONFIG_DYNAMIC
1061
1062 static int __init ic_dynamic(void)
1063 {
1064         int retries;
1065         struct ic_device *d;
1066         unsigned long start_jiffies, timeout, jiff;
1067         int do_bootp = ic_proto_have_if & IC_BOOTP;
1068         int do_rarp = ic_proto_have_if & IC_RARP;
1069
1070         /*
1071          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1072          * This routine gets only called when some pieces of information
1073          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1074          */
1075         if (!ic_proto_enabled) {
1076                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1077                 return -1;
1078         }
1079
1080 #ifdef IPCONFIG_BOOTP
1081         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1082                 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1083 #endif
1084 #ifdef IPCONFIG_RARP
1085         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1086                 printk(KERN_ERR "RARP: No suitable device found.\n");
1087 #endif
1088
1089         if (!ic_proto_have_if)
1090                 /* Error message already printed */
1091                 return -1;
1092
1093         /*
1094          * Setup protocols
1095          */
1096 #ifdef IPCONFIG_BOOTP
1097         if (do_bootp)
1098                 ic_bootp_init();
1099 #endif
1100 #ifdef IPCONFIG_RARP
1101         if (do_rarp)
1102                 ic_rarp_init();
1103 #endif
1104
1105         /*
1106          * Send requests and wait, until we get an answer. This loop
1107          * seems to be a terrible waste of CPU time, but actually there is
1108          * only one process running at all, so we don't need to use any
1109          * scheduler functions.
1110          * [Actually we could now, but the nothing else running note still
1111          *  applies.. - AC]
1112          */
1113         printk(KERN_NOTICE "Sending %s%s%s requests .",
1114                do_bootp
1115                 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1116                (do_bootp && do_rarp) ? " and " : "",
1117                do_rarp ? "RARP" : "");
1118
1119         start_jiffies = jiffies;
1120         d = ic_first_dev;
1121         retries = CONF_SEND_RETRIES;
1122         get_random_bytes(&timeout, sizeof(timeout));
1123         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1124         for (;;) {
1125 #ifdef IPCONFIG_BOOTP
1126                 if (do_bootp && (d->able & IC_BOOTP))
1127                         ic_bootp_send_if(d, jiffies - start_jiffies);
1128 #endif
1129 #ifdef IPCONFIG_RARP
1130                 if (do_rarp && (d->able & IC_RARP))
1131                         ic_rarp_send_if(d);
1132 #endif
1133
1134                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1135                 while (time_before(jiffies, jiff) && !ic_got_reply)
1136                         schedule_timeout_uninterruptible(1);
1137 #ifdef IPCONFIG_DHCP
1138                 /* DHCP isn't done until we get a DHCPACK. */
1139                 if ((ic_got_reply & IC_BOOTP)
1140                     && (ic_proto_enabled & IC_USE_DHCP)
1141                     && ic_dhcp_msgtype != DHCPACK)
1142                 {
1143                         ic_got_reply = 0;
1144                         printk(",");
1145                         continue;
1146                 }
1147 #endif /* IPCONFIG_DHCP */
1148
1149                 if (ic_got_reply) {
1150                         printk(" OK\n");
1151                         break;
1152                 }
1153
1154                 if ((d = d->next))
1155                         continue;
1156
1157                 if (! --retries) {
1158                         printk(" timed out!\n");
1159                         break;
1160                 }
1161
1162                 d = ic_first_dev;
1163
1164                 timeout = timeout CONF_TIMEOUT_MULT;
1165                 if (timeout > CONF_TIMEOUT_MAX)
1166                         timeout = CONF_TIMEOUT_MAX;
1167
1168                 printk(".");
1169         }
1170
1171 #ifdef IPCONFIG_BOOTP
1172         if (do_bootp)
1173                 ic_bootp_cleanup();
1174 #endif
1175 #ifdef IPCONFIG_RARP
1176         if (do_rarp)
1177                 ic_rarp_cleanup();
1178 #endif
1179
1180         if (!ic_got_reply) {
1181                 ic_myaddr = NONE;
1182                 return -1;
1183         }
1184
1185         printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
1186                 ((ic_got_reply & IC_RARP) ? "RARP"
1187                  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1188                 NIPQUAD(ic_servaddr));
1189         printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
1190
1191         return 0;
1192 }
1193
1194 #endif /* IPCONFIG_DYNAMIC */
1195
1196 #ifdef CONFIG_PROC_FS
1197
1198 static int pnp_seq_show(struct seq_file *seq, void *v)
1199 {
1200         int i;
1201
1202         if (ic_proto_used & IC_PROTO)
1203                 seq_printf(seq, "#PROTO: %s\n",
1204                            (ic_proto_used & IC_RARP) ? "RARP"
1205                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1206         else
1207                 seq_puts(seq, "#MANUAL\n");
1208
1209         if (ic_domain[0])
1210                 seq_printf(seq,
1211                            "domain %s\n", ic_domain);
1212         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1213                 if (ic_nameservers[i] != NONE)
1214                         seq_printf(seq,
1215                                    "nameserver %u.%u.%u.%u\n",
1216                                    NIPQUAD(ic_nameservers[i]));
1217         }
1218         if (ic_servaddr != NONE)
1219                 seq_printf(seq,
1220                            "bootserver %u.%u.%u.%u\n",
1221                            NIPQUAD(ic_servaddr));
1222         return 0;
1223 }
1224
1225 static int pnp_seq_open(struct inode *indoe, struct file *file)
1226 {
1227         return single_open(file, pnp_seq_show, NULL);
1228 }
1229
1230 static const struct file_operations pnp_seq_fops = {
1231         .owner          = THIS_MODULE,
1232         .open           = pnp_seq_open,
1233         .read           = seq_read,
1234         .llseek         = seq_lseek,
1235         .release        = single_release,
1236 };
1237 #endif /* CONFIG_PROC_FS */
1238
1239 /*
1240  *  Extract IP address from the parameter string if needed. Note that we
1241  *  need to have root_server_addr set _before_ IPConfig gets called as it
1242  *  can override it.
1243  */
1244 __be32 __init root_nfs_parse_addr(char *name)
1245 {
1246         __be32 addr;
1247         int octets = 0;
1248         char *cp, *cq;
1249
1250         cp = cq = name;
1251         while (octets < 4) {
1252                 while (*cp >= '0' && *cp <= '9')
1253                         cp++;
1254                 if (cp == cq || cp - cq > 3)
1255                         break;
1256                 if (*cp == '.' || octets == 3)
1257                         octets++;
1258                 if (octets < 4)
1259                         cp++;
1260                 cq = cp;
1261         }
1262         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1263                 if (*cp == ':')
1264                         *cp++ = '\0';
1265                 addr = in_aton(name);
1266                 memmove(name, cp, strlen(cp) + 1);
1267         } else
1268                 addr = NONE;
1269
1270         return addr;
1271 }
1272
1273 /*
1274  *      IP Autoconfig dispatcher.
1275  */
1276
1277 static int __init ip_auto_config(void)
1278 {
1279         __be32 addr;
1280
1281 #ifdef CONFIG_PROC_FS
1282         proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1283 #endif /* CONFIG_PROC_FS */
1284
1285         if (!ic_enable)
1286                 return 0;
1287
1288         DBG(("IP-Config: Entered.\n"));
1289 #ifdef IPCONFIG_DYNAMIC
1290  try_try_again:
1291 #endif
1292         /* Give hardware a chance to settle */
1293         msleep(CONF_PRE_OPEN);
1294
1295         /* Setup all network devices */
1296         if (ic_open_devs() < 0)
1297                 return -1;
1298
1299         /* Give drivers a chance to settle */
1300         ssleep(CONF_POST_OPEN);
1301
1302         /*
1303          * If the config information is insufficient (e.g., our IP address or
1304          * IP address of the boot server is missing or we have multiple network
1305          * interfaces and no default was set), use BOOTP or RARP to get the
1306          * missing values.
1307          */
1308         if (ic_myaddr == NONE ||
1309 #ifdef CONFIG_ROOT_NFS
1310             (root_server_addr == NONE
1311              && ic_servaddr == NONE
1312              && ROOT_DEV == Root_NFS) ||
1313 #endif
1314             ic_first_dev->next) {
1315 #ifdef IPCONFIG_DYNAMIC
1316
1317                 int retries = CONF_OPEN_RETRIES;
1318
1319                 if (ic_dynamic() < 0) {
1320                         ic_close_devs();
1321
1322                         /*
1323                          * I don't know why, but sometimes the
1324                          * eepro100 driver (at least) gets upset and
1325                          * doesn't work the first time it's opened.
1326                          * But then if you close it and reopen it, it
1327                          * works just fine.  So we need to try that at
1328                          * least once before giving up.
1329                          *
1330                          * Also, if the root will be NFS-mounted, we
1331                          * have nowhere to go if DHCP fails.  So we
1332                          * just have to keep trying forever.
1333                          *
1334                          *                              -- Chip
1335                          */
1336 #ifdef CONFIG_ROOT_NFS
1337                         if (ROOT_DEV ==  Root_NFS) {
1338                                 printk(KERN_ERR
1339                                         "IP-Config: Retrying forever (NFS root)...\n");
1340                                 goto try_try_again;
1341                         }
1342 #endif
1343
1344                         if (--retries) {
1345                                 printk(KERN_ERR
1346                                        "IP-Config: Reopening network devices...\n");
1347                                 goto try_try_again;
1348                         }
1349
1350                         /* Oh, well.  At least we tried. */
1351                         printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1352                         return -1;
1353                 }
1354 #else /* !DYNAMIC */
1355                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1356                 ic_close_devs();
1357                 return -1;
1358 #endif /* IPCONFIG_DYNAMIC */
1359         } else {
1360                 /* Device selected manually or only one device -> use it */
1361                 ic_dev = ic_first_dev->dev;
1362         }
1363
1364         addr = root_nfs_parse_addr(root_server_path);
1365         if (root_server_addr == NONE)
1366                 root_server_addr = addr;
1367
1368         /*
1369          * Use defaults whereever applicable.
1370          */
1371         if (ic_defaults() < 0)
1372                 return -1;
1373
1374         /*
1375          * Close all network devices except the device we've
1376          * autoconfigured and set up routes.
1377          */
1378         ic_close_devs();
1379         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1380                 return -1;
1381
1382         /*
1383          * Record which protocol was actually used.
1384          */
1385 #ifdef IPCONFIG_DYNAMIC
1386         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1387 #endif
1388
1389 #ifndef IPCONFIG_SILENT
1390         /*
1391          * Clue in the operator.
1392          */
1393         printk("IP-Config: Complete:");
1394         printk("\n     device=%s", ic_dev->name);
1395         printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
1396         printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
1397         printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
1398         printk(",\n     host=%s, domain=%s, nis-domain=%s",
1399                utsname()->nodename, ic_domain, utsname()->domainname);
1400         printk(",\n     bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
1401         printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
1402         printk(", rootpath=%s", root_server_path);
1403         printk("\n");
1404 #endif /* !SILENT */
1405
1406         return 0;
1407 }
1408
1409 late_initcall(ip_auto_config);
1410
1411
1412 /*
1413  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1414  *  command line parameter.  See Documentation/filesystems/nfsroot.txt.
1415  */
1416 static int __init ic_proto_name(char *name)
1417 {
1418         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1419                 return 1;
1420         }
1421         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1422                 return 0;
1423         }
1424 #ifdef CONFIG_IP_PNP_DHCP
1425         else if (!strcmp(name, "dhcp")) {
1426                 ic_proto_enabled &= ~IC_RARP;
1427                 return 1;
1428         }
1429 #endif
1430 #ifdef CONFIG_IP_PNP_BOOTP
1431         else if (!strcmp(name, "bootp")) {
1432                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1433                 return 1;
1434         }
1435 #endif
1436 #ifdef CONFIG_IP_PNP_RARP
1437         else if (!strcmp(name, "rarp")) {
1438                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1439                 return 1;
1440         }
1441 #endif
1442 #ifdef IPCONFIG_DYNAMIC
1443         else if (!strcmp(name, "both")) {
1444                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1445                 return 1;
1446         }
1447 #endif
1448         return 0;
1449 }
1450
1451 static int __init ip_auto_config_setup(char *addrs)
1452 {
1453         char *cp, *ip, *dp;
1454         int num = 0;
1455
1456         ic_set_manually = 1;
1457         ic_enable = 1;
1458
1459         /*
1460          * If any dhcp, bootp etc options are set, leave autoconfig on
1461          * and skip the below static IP processing.
1462          */
1463         if (ic_proto_name(addrs))
1464                 return 1;
1465
1466         /* If no static IP is given, turn off autoconfig and bail.  */
1467         if (*addrs == 0 ||
1468             strcmp(addrs, "off") == 0 ||
1469             strcmp(addrs, "none") == 0) {
1470                 ic_enable = 0;
1471                 return 1;
1472         }
1473
1474         /* Parse string for static IP assignment.  */
1475         ip = addrs;
1476         while (ip && *ip) {
1477                 if ((cp = strchr(ip, ':')))
1478                         *cp++ = '\0';
1479                 if (strlen(ip) > 0) {
1480                         DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1481                         switch (num) {
1482                         case 0:
1483                                 if ((ic_myaddr = in_aton(ip)) == ANY)
1484                                         ic_myaddr = NONE;
1485                                 break;
1486                         case 1:
1487                                 if ((ic_servaddr = in_aton(ip)) == ANY)
1488                                         ic_servaddr = NONE;
1489                                 break;
1490                         case 2:
1491                                 if ((ic_gateway = in_aton(ip)) == ANY)
1492                                         ic_gateway = NONE;
1493                                 break;
1494                         case 3:
1495                                 if ((ic_netmask = in_aton(ip)) == ANY)
1496                                         ic_netmask = NONE;
1497                                 break;
1498                         case 4:
1499                                 if ((dp = strchr(ip, '.'))) {
1500                                         *dp++ = '\0';
1501                                         strlcpy(utsname()->domainname, dp,
1502                                                 sizeof(utsname()->domainname));
1503                                 }
1504                                 strlcpy(utsname()->nodename, ip,
1505                                         sizeof(utsname()->nodename));
1506                                 ic_host_name_set = 1;
1507                                 break;
1508                         case 5:
1509                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1510                                 break;
1511                         case 6:
1512                                 if (ic_proto_name(ip) == 0 &&
1513                                     ic_myaddr == NONE) {
1514                                         ic_enable = 0;
1515                                 }
1516                                 break;
1517                         }
1518                 }
1519                 ip = cp;
1520                 num++;
1521         }
1522
1523         return 1;
1524 }
1525
1526 static int __init nfsaddrs_config_setup(char *addrs)
1527 {
1528         return ip_auto_config_setup(addrs);
1529 }
1530
1531 static int __init vendor_class_identifier_setup(char *addrs)
1532 {
1533         if (strlcpy(vendor_class_identifier, addrs,
1534                     sizeof(vendor_class_identifier))
1535             >= sizeof(vendor_class_identifier))
1536                 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1537                        vendor_class_identifier);
1538         return 1;
1539 }
1540
1541 __setup("ip=", ip_auto_config_setup);
1542 __setup("nfsaddrs=", nfsaddrs_config_setup);
1543 __setup("dhcpclass=", vendor_class_identifier_setup);