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
 107 /*
 108  * Public IP configuration
 109  */
 110
 111 /* This is used by platforms which might be able to set the ipconfig
 112  * variables using firmware environment vars.  If this is set, it will
 113  * ignore such firmware variables.
 114  */
 115 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
 116
 117 static int ic_enable __initdata = 0;            /* IP config enabled? */
 118
 119 /* Protocol choice */
 120 int ic_proto_enabled __initdata = 0
 121 #ifdef IPCONFIG_BOOTP
 122                         | IC_BOOTP
 123 #endif
 124 #ifdef CONFIG_IP_PNP_DHCP
 125                         | IC_USE_DHCP
 126 #endif
 127 #ifdef IPCONFIG_RARP
 128                         | IC_RARP
 129 #endif
 130                         ;
 131
 132 static int ic_host_name_set __initdata = 0;     /* Host name set by us? */
 133
 134 __be32 ic_myaddr = NONE;                /* My IP address */
 135 static __be32 ic_netmask = NONE;        /* Netmask for local subnet */
 136 __be32 ic_gateway = NONE;       /* Gateway IP address */
 137
 138 __be32 ic_servaddr = NONE;      /* Boot server IP address */
 139
 140 __be32 root_server_addr = NONE; /* Address of NFS server */
 141 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
 142
 143 /* vendor class identifier */
 144 static char vendor_class_identifier[253] __initdata;
 145
 146 /* Persistent data: */
 147
 148 static int ic_proto_used;                       /* Protocol used, if any */
 149 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
 150 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
 151
 152 /*
 153  * Private state.
 154  */
 155
 156 /* Name of user-selected boot device */
 157 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
 158
 159 /* Protocols supported by available interfaces */
 160 static int ic_proto_have_if __initdata = 0;
 161
 162 #ifdef IPCONFIG_DYNAMIC
 163 static DEFINE_SPINLOCK(ic_recv_lock);
 164 static volatile int ic_got_reply __initdata = 0;    /* Proto(s) that replied */
 165 #endif
 166 #ifdef IPCONFIG_DHCP
 167 static int ic_dhcp_msgtype __initdata = 0;      /* DHCP msg type received */
 168 #endif
 169
 170
 171 /*
 172  *      Network devices
 173  */
 174
 175 struct ic_device {
 176         struct ic_device *next;
 177         struct net_device *dev;
 178         unsigned short flags;
 179         short able;
 180         __be32 xid;
 181 };
 182
 183 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
 184 static struct net_device *ic_dev __initdata = NULL;     /* Selected device */
 185
 186 static int __init ic_open_devs(void)
 187 {
 188         struct ic_device *d, **last;
 189         struct net_device *dev;
 190         unsigned short oflags;
 191
 192         last = &ic_first_dev;
 193         rtnl_lock();
 194
 195         /* bring loopback device up first */
 196         for_each_netdev(&init_net, dev) {
 197                 if (!(dev->flags & IFF_LOOPBACK))
 198                         continue;
 199                 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
 200                         printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
 201         }
 202
 203         for_each_netdev(&init_net, dev) {
 204                 if (dev->flags & IFF_LOOPBACK)
 205                         continue;
 206                 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
 207                     (!(dev->flags & IFF_LOOPBACK) &&
 208                      (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
 209                      strncmp(dev->name, "dummy", 5))) {
 210                         int able = 0;
 211                         if (dev->mtu >= 364)
 212                                 able |= IC_BOOTP;
 213                         else
 214                                 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
 215                         if (!(dev->flags & IFF_NOARP))
 216                                 able |= IC_RARP;
 217                         able &= ic_proto_enabled;
 218                         if (ic_proto_enabled && !able)
 219                                 continue;
 220                         oflags = dev->flags;
 221                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
 222                                 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
 223                                 continue;
 224                         }
 225                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
 226                                 rtnl_unlock();
 227                                 return -1;
 228                         }
 229                         d->dev = dev;
 230                         *last = d;
 231                         last = &d->next;
 232                         d->flags = oflags;
 233                         d->able = able;
 234                         if (able & IC_BOOTP)
 235                                 get_random_bytes(&d->xid, sizeof(__be32));
 236                         else
 237                                 d->xid = 0;
 238                         ic_proto_have_if |= able;
 239                         DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
 240                                 dev->name, able, d->xid));
 241                 }
 242         }
 243         rtnl_unlock();
 244
 245         *last = NULL;
 246
 247         if (!ic_first_dev) {
 248                 if (user_dev_name[0])
 249                         printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
 250                 else
 251                         printk(KERN_ERR "IP-Config: No network devices available.\n");
 252                 return -1;
 253         }
 254         return 0;
 255 }
 256
 257 static void __init ic_close_devs(void)
 258 {
 259         struct ic_device *d, *next;
 260         struct net_device *dev;
 261
 262         rtnl_lock();
 263         next = ic_first_dev;
 264         while ((d = next)) {
 265                 next = d->next;
 266                 dev = d->dev;
 267                 if (dev != ic_dev) {
 268                         DBG(("IP-Config: Downing %s\n", dev->name));
 269                         dev_change_flags(dev, d->flags);
 270                 }
 271                 kfree(d);
 272         }
 273         rtnl_unlock();
 274 }
 275
 276 /*
 277  *      Interface to various network functions.
 278  */
 279
 280 static inline void
 281 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
 282 {
 283         sin->sin_family = AF_INET;
 284         sin->sin_addr.s_addr = addr;
 285         sin->sin_port = port;
 286 }
 287
 288 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
 289 {
 290         int res;
 291
 292         mm_segment_t oldfs = get_fs();
 293         set_fs(get_ds());
 294         res = devinet_ioctl(cmd, (struct ifreq __user *) arg);
 295         set_fs(oldfs);
 296         return res;
 297 }
 298
 299 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
 300 {
 301         int res;
 302
 303         mm_segment_t oldfs = get_fs();
 304         set_fs(get_ds());
 305         res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
 306         set_fs(oldfs);
 307         return res;
 308 }
 309
 310 /*
 311  *      Set up interface addresses and routes.
 312  */
 313
 314 static int __init ic_setup_if(void)
 315 {
 316         struct ifreq ir;
 317         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
 318         int err;
 319
 320         memset(&ir, 0, sizeof(ir));
 321         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
 322         set_sockaddr(sin, ic_myaddr, 0);
 323         if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
 324                 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
 325                 return -1;
 326         }
 327         set_sockaddr(sin, ic_netmask, 0);
 328         if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
 329                 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
 330                 return -1;
 331         }
 332         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
 333         if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
 334                 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
 335                 return -1;
 336         }
 337         return 0;
 338 }
 339
 340 static int __init ic_setup_routes(void)
 341 {
 342         /* No need to setup device routes, only the default route... */
 343
 344         if (ic_gateway != NONE) {
 345                 struct rtentry rm;
 346                 int err;
 347
 348                 memset(&rm, 0, sizeof(rm));
 349                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
 350                         printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
 351                         return -1;
 352                 }
 353                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
 354                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
 355                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
 356                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
 357                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
 358                         printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
 359                         return -1;
 360                 }
 361         }
 362
 363         return 0;
 364 }
 365
 366 /*
 367  *      Fill in default values for all missing parameters.
 368  */
 369
 370 static int __init ic_defaults(void)
 371 {
 372         /*
 373          *      At this point we have no userspace running so need not
 374          *      claim locks on system_utsname
 375          */
 376
 377         if (!ic_host_name_set)
 378                 sprintf(init_utsname()->nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr));
 379
 380         if (root_server_addr == NONE)
 381                 root_server_addr = ic_servaddr;
 382
 383         if (ic_netmask == NONE) {
 384                 if (IN_CLASSA(ntohl(ic_myaddr)))
 385                         ic_netmask = htonl(IN_CLASSA_NET);
 386                 else if (IN_CLASSB(ntohl(ic_myaddr)))
 387                         ic_netmask = htonl(IN_CLASSB_NET);
 388                 else if (IN_CLASSC(ntohl(ic_myaddr)))
 389                         ic_netmask = htonl(IN_CLASSC_NET);
 390                 else {
 391                         printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n",
 392                                 NIPQUAD(ic_myaddr));
 393                         return -1;
 394                 }
 395                 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask));
 396         }
 397
 398         return 0;
 399 }
 400
 401 /*
 402  *      RARP support.
 403  */
 404
 405 #ifdef IPCONFIG_RARP
 406
 407 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 408
 409 static struct packet_type rarp_packet_type __initdata = {
 410         .type = __constant_htons(ETH_P_RARP),
 411         .func = ic_rarp_recv,
 412 };
 413
 414 static inline void ic_rarp_init(void)
 415 {
 416         dev_add_pack(&rarp_packet_type);
 417 }
 418
 419 static inline void ic_rarp_cleanup(void)
 420 {
 421         dev_remove_pack(&rarp_packet_type);
 422 }
 423
 424 /*
 425  *  Process received RARP packet.
 426  */
 427 static int __init
 428 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 429 {
 430         struct arphdr *rarp;
 431         unsigned char *rarp_ptr;
 432         __be32 sip, tip;
 433         unsigned char *sha, *tha;               /* s for "source", t for "target" */
 434         struct ic_device *d;
 435
 436         if (dev->nd_net != &init_net)
 437                 goto drop;
 438
 439         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 440                 return NET_RX_DROP;
 441
 442         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
 443                 goto drop;
 444
 445         /* Basic sanity checks can be done without the lock.  */
 446         rarp = (struct arphdr *)skb_transport_header(skb);
 447
 448         /* If this test doesn't pass, it's not IP, or we should
 449          * ignore it anyway.
 450          */
 451         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
 452                 goto drop;
 453
 454         /* If it's not a RARP reply, delete it. */
 455         if (rarp->ar_op != htons(ARPOP_RREPLY))
 456                 goto drop;
 457
 458         /* If it's not Ethernet, delete it. */
 459         if (rarp->ar_pro != htons(ETH_P_IP))
 460                 goto drop;
 461
 462         if (!pskb_may_pull(skb,
 463                            sizeof(struct arphdr) +
 464                            (2 * dev->addr_len) +
 465                            (2 * 4)))
 466                 goto drop;
 467
 468         /* OK, it is all there and looks valid, process... */
 469         rarp = (struct arphdr *)skb_transport_header(skb);
 470         rarp_ptr = (unsigned char *) (rarp + 1);
 471
 472         /* One reply at a time, please. */
 473         spin_lock(&ic_recv_lock);
 474
 475         /* If we already have a reply, just drop the packet */
 476         if (ic_got_reply)
 477                 goto drop_unlock;
 478
 479         /* Find the ic_device that the packet arrived on */
 480         d = ic_first_dev;
 481         while (d && d->dev != dev)
 482                 d = d->next;
 483         if (!d)
 484                 goto drop_unlock;       /* should never happen */
 485
 486         /* Extract variable-width fields */
 487         sha = rarp_ptr;
 488         rarp_ptr += dev->addr_len;
 489         memcpy(&sip, rarp_ptr, 4);
 490         rarp_ptr += 4;
 491         tha = rarp_ptr;
 492         rarp_ptr += dev->addr_len;
 493         memcpy(&tip, rarp_ptr, 4);
 494
 495         /* Discard packets which are not meant for us. */
 496         if (memcmp(tha, dev->dev_addr, dev->addr_len))
 497                 goto drop_unlock;
 498
 499         /* Discard packets which are not from specified server. */
 500         if (ic_servaddr != NONE && ic_servaddr != sip)
 501                 goto drop_unlock;
 502
 503         /* We have a winner! */
 504         ic_dev = dev;
 505         if (ic_myaddr == NONE)
 506                 ic_myaddr = tip;
 507         ic_servaddr = sip;
 508         ic_got_reply = IC_RARP;
 509
 510 drop_unlock:
 511         /* Show's over.  Nothing to see here.  */
 512         spin_unlock(&ic_recv_lock);
 513
 514 drop:
 515         /* Throw the packet out. */
 516         kfree_skb(skb);
 517         return 0;
 518 }
 519
 520
 521 /*
 522  *  Send RARP request packet over a single interface.
 523  */
 524 static void __init ic_rarp_send_if(struct ic_device *d)
 525 {
 526         struct net_device *dev = d->dev;
 527         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
 528                  dev->dev_addr, dev->dev_addr);
 529 }
 530 #endif
 531
 532 /*
 533  *      DHCP/BOOTP support.
 534  */
 535
 536 #ifdef IPCONFIG_BOOTP
 537
 538 struct bootp_pkt {              /* BOOTP packet format */
 539         struct iphdr iph;       /* IP header */
 540         struct udphdr udph;     /* UDP header */
 541         u8 op;                  /* 1=request, 2=reply */
 542         u8 htype;               /* HW address type */
 543         u8 hlen;                /* HW address length */
 544         u8 hops;                /* Used only by gateways */
 545         __be32 xid;             /* Transaction ID */
 546         __be16 secs;            /* Seconds since we started */
 547         __be16 flags;           /* Just what it says */
 548         __be32 client_ip;               /* Client's IP address if known */
 549         __be32 your_ip;         /* Assigned IP address */
 550         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
 551         __be32 relay_ip;                /* IP address of BOOTP relay */
 552         u8 hw_addr[16];         /* Client's HW address */
 553         u8 serv_name[64];       /* Server host name */
 554         u8 boot_file[128];      /* Name of boot file */
 555         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
 556 };
 557
 558 /* packet ops */
 559 #define BOOTP_REQUEST   1
 560 #define BOOTP_REPLY     2
 561
 562 /* DHCP message types */
 563 #define DHCPDISCOVER    1
 564 #define DHCPOFFER       2
 565 #define DHCPREQUEST     3
 566 #define DHCPDECLINE     4
 567 #define DHCPACK         5
 568 #define DHCPNAK         6
 569 #define DHCPRELEASE     7
 570 #define DHCPINFORM      8
 571
 572 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 573
 574 static struct packet_type bootp_packet_type __initdata = {
 575         .type = __constant_htons(ETH_P_IP),
 576         .func = ic_bootp_recv,
 577 };
 578
 579
 580 /*
 581  *  Initialize DHCP/BOOTP extension fields in the request.
 582  */
 583
 584 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
 585
 586 #ifdef IPCONFIG_DHCP
 587
 588 static void __init
 589 ic_dhcp_init_options(u8 *options)
 590 {
 591         u8 mt = ((ic_servaddr == NONE)
 592                  ? DHCPDISCOVER : DHCPREQUEST);
 593         u8 *e = options;
 594         int len;
 595
 596 #ifdef IPCONFIG_DEBUG
 597         printk("DHCP: Sending message type %d\n", mt);
 598 #endif
 599
 600         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 601         e += 4;
 602
 603         *e++ = 53;              /* DHCP message type */
 604         *e++ = 1;
 605         *e++ = mt;
 606
 607         if (mt == DHCPREQUEST) {
 608                 *e++ = 54;      /* Server ID (IP address) */
 609                 *e++ = 4;
 610                 memcpy(e, &ic_servaddr, 4);
 611                 e += 4;
 612
 613                 *e++ = 50;      /* Requested IP address */
 614                 *e++ = 4;
 615                 memcpy(e, &ic_myaddr, 4);
 616                 e += 4;
 617         }
 618
 619         /* always? */
 620         {
 621                 static const u8 ic_req_params[] = {
 622                         1,      /* Subnet mask */
 623                         3,      /* Default gateway */
 624                         6,      /* DNS server */
 625                         12,     /* Host name */
 626                         15,     /* Domain name */
 627                         17,     /* Boot path */
 628                         40,     /* NIS domain name */
 629                 };
 630
 631                 *e++ = 55;      /* Parameter request list */
 632                 *e++ = sizeof(ic_req_params);
 633                 memcpy(e, ic_req_params, sizeof(ic_req_params));
 634                 e += sizeof(ic_req_params);
 635
 636                 if (*vendor_class_identifier) {
 637                         printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
 638                                vendor_class_identifier);
 639                         *e++ = 60;      /* Class-identifier */
 640                         len = strlen(vendor_class_identifier);
 641                         *e++ = len;
 642                         memcpy(e, vendor_class_identifier, len);
 643                         e += len;
 644                 }
 645         }
 646
 647         *e++ = 255;     /* End of the list */
 648 }
 649
 650 #endif /* IPCONFIG_DHCP */
 651
 652 static void __init ic_bootp_init_ext(u8 *e)
 653 {
 654         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 655         e += 4;
 656         *e++ = 1;               /* Subnet mask request */
 657         *e++ = 4;
 658         e += 4;
 659         *e++ = 3;               /* Default gateway request */
 660         *e++ = 4;
 661         e += 4;
 662         *e++ = 5;               /* Name server request */
 663         *e++ = 8;
 664         e += 8;
 665         *e++ = 12;              /* Host name request */
 666         *e++ = 32;
 667         e += 32;
 668         *e++ = 40;              /* NIS Domain name request */
 669         *e++ = 32;
 670         e += 32;
 671         *e++ = 17;              /* Boot path */
 672         *e++ = 40;
 673         e += 40;
 674
 675         *e++ = 57;              /* set extension buffer size for reply */
 676         *e++ = 2;
 677         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
 678         *e++ = 150;
 679
 680         *e++ = 255;             /* End of the list */
 681 }
 682
 683
 684 /*
 685  *  Initialize the DHCP/BOOTP mechanism.
 686  */
 687 static inline void ic_bootp_init(void)
 688 {
 689         int i;
 690
 691         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
 692                 ic_nameservers[i] = NONE;
 693
 694         dev_add_pack(&bootp_packet_type);
 695 }
 696
 697
 698 /*
 699  *  DHCP/BOOTP cleanup.
 700  */
 701 static inline void ic_bootp_cleanup(void)
 702 {
 703         dev_remove_pack(&bootp_packet_type);
 704 }
 705
 706
 707 /*
 708  *  Send DHCP/BOOTP request to single interface.
 709  */
 710 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
 711 {
 712         struct net_device *dev = d->dev;
 713         struct sk_buff *skb;
 714         struct bootp_pkt *b;
 715         int hh_len = LL_RESERVED_SPACE(dev);
 716         struct iphdr *h;
 717
 718         /* Allocate packet */
 719         skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
 720         if (!skb)
 721                 return;
 722         skb_reserve(skb, hh_len);
 723         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
 724         memset(b, 0, sizeof(struct bootp_pkt));
 725
 726         /* Construct IP header */
 727         skb_reset_network_header(skb);
 728         h = ip_hdr(skb);
 729         h->version = 4;
 730         h->ihl = 5;
 731         h->tot_len = htons(sizeof(struct bootp_pkt));
 732         h->frag_off = htons(IP_DF);
 733         h->ttl = 64;
 734         h->protocol = IPPROTO_UDP;
 735         h->daddr = htonl(INADDR_BROADCAST);
 736         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
 737
 738         /* Construct UDP header */
 739         b->udph.source = htons(68);
 740         b->udph.dest = htons(67);
 741         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
 742         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
 743
 744         /* Construct DHCP/BOOTP header */
 745         b->op = BOOTP_REQUEST;
 746         if (dev->type < 256) /* check for false types */
 747                 b->htype = dev->type;
 748         else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
 749                 b->htype = ARPHRD_IEEE802;
 750         else if (dev->type == ARPHRD_FDDI)
 751                 b->htype = ARPHRD_ETHER;
 752         else {
 753                 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
 754                 b->htype = dev->type; /* can cause undefined behavior */
 755         }
 756         b->hlen = dev->addr_len;
 757         b->your_ip = NONE;
 758         b->server_ip = NONE;
 759         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
 760         b->secs = htons(jiffies_diff / HZ);
 761         b->xid = d->xid;
 762
 763         /* add DHCP options or BOOTP extensions */
 764 #ifdef IPCONFIG_DHCP
 765         if (ic_proto_enabled & IC_USE_DHCP)
 766                 ic_dhcp_init_options(b->exten);
 767         else
 768 #endif
 769                 ic_bootp_init_ext(b->exten);
 770
 771         /* Chain packet down the line... */
 772         skb->dev = dev;
 773         skb->protocol = htons(ETH_P_IP);
 774         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
 775                             dev->broadcast, dev->dev_addr, skb->len) < 0 ||
 776             dev_queue_xmit(skb) < 0)
 777                 printk("E");
 778 }
 779
 780
 781 /*
 782  *  Copy BOOTP-supplied string if not already set.
 783  */
 784 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
 785 {
 786         if (!len)
 787                 return 0;
 788         if (len > max-1)
 789                 len = max-1;
 790         memcpy(dest, src, len);
 791         dest[len] = '\0';
 792         return 1;
 793 }
 794
 795
 796 /*
 797  *  Process BOOTP extensions.
 798  */
 799 static void __init ic_do_bootp_ext(u8 *ext)
 800 {
 801        u8 servers;
 802        int i;
 803
 804 #ifdef IPCONFIG_DEBUG
 805         u8 *c;
 806
 807         printk("DHCP/BOOTP: Got extension %d:",*ext);
 808         for (c=ext+2; c<ext+2+ext[1]; c++)
 809                 printk(" %02x", *c);
 810         printk("\n");
 811 #endif
 812
 813         switch (*ext++) {
 814                 case 1:         /* Subnet mask */
 815                         if (ic_netmask == NONE)
 816                                 memcpy(&ic_netmask, ext+1, 4);
 817                         break;
 818                 case 3:         /* Default gateway */
 819                         if (ic_gateway == NONE)
 820                                 memcpy(&ic_gateway, ext+1, 4);
 821                         break;
 822                 case 6:         /* DNS server */
 823                         servers= *ext/4;
 824                         if (servers > CONF_NAMESERVERS_MAX)
 825                                 servers = CONF_NAMESERVERS_MAX;
 826                         for (i = 0; i < servers; i++) {
 827                                 if (ic_nameservers[i] == NONE)
 828                                         memcpy(&ic_nameservers[i], ext+1+4*i, 4);
 829                         }
 830                         break;
 831                 case 12:        /* Host name */
 832                         ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
 833                         ic_host_name_set = 1;
 834                         break;
 835                 case 15:        /* Domain name (DNS) */
 836                         ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
 837                         break;
 838                 case 17:        /* Root path */
 839                         if (!root_server_path[0])
 840                                 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
 841                         break;
 842                 case 40:        /* NIS Domain name (_not_ DNS) */
 843                         ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
 844                         break;
 845         }
 846 }
 847
 848
 849 /*
 850  *  Receive BOOTP reply.
 851  */
 852 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 853 {
 854         struct bootp_pkt *b;
 855         struct iphdr *h;
 856         struct ic_device *d;
 857         int len, ext_len;
 858
 859         if (dev->nd_net != &init_net)
 860                 goto drop;
 861
 862         /* Perform verifications before taking the lock.  */
 863         if (skb->pkt_type == PACKET_OTHERHOST)
 864                 goto drop;
 865
 866         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 867                 return NET_RX_DROP;
 868
 869         if (!pskb_may_pull(skb,
 870                            sizeof(struct iphdr) +
 871                            sizeof(struct udphdr)))
 872                 goto drop;
 873
 874         b = (struct bootp_pkt *)skb_network_header(skb);
 875         h = &b->iph;
 876
 877         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
 878                 goto drop;
 879
 880         /* Fragments are not supported */
 881         if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
 882                 if (net_ratelimit())
 883                         printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
 884                                "reply.\n");
 885                 goto drop;
 886         }
 887
 888         if (skb->len < ntohs(h->tot_len))
 889                 goto drop;
 890
 891         if (ip_fast_csum((char *) h, h->ihl))
 892                 goto drop;
 893
 894         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
 895                 goto drop;
 896
 897         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
 898                 goto drop;
 899
 900         len = ntohs(b->udph.len) - sizeof(struct udphdr);
 901         ext_len = len - (sizeof(*b) -
 902                          sizeof(struct iphdr) -
 903                          sizeof(struct udphdr) -
 904                          sizeof(b->exten));
 905         if (ext_len < 0)
 906                 goto drop;
 907
 908         /* Ok the front looks good, make sure we can get at the rest.  */
 909         if (!pskb_may_pull(skb, skb->len))
 910                 goto drop;
 911
 912         b = (struct bootp_pkt *)skb_network_header(skb);
 913         h = &b->iph;
 914
 915         /* One reply at a time, please. */
 916         spin_lock(&ic_recv_lock);
 917
 918         /* If we already have a reply, just drop the packet */
 919         if (ic_got_reply)
 920                 goto drop_unlock;
 921
 922         /* Find the ic_device that the packet arrived on */
 923         d = ic_first_dev;
 924         while (d && d->dev != dev)
 925                 d = d->next;
 926         if (!d)
 927                 goto drop_unlock;  /* should never happen */
 928
 929         /* Is it a reply to our BOOTP request? */
 930         if (b->op != BOOTP_REPLY ||
 931             b->xid != d->xid) {
 932                 if (net_ratelimit())
 933                         printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
 934                                "op[%x] xid[%x]\n",
 935                                b->op, b->xid);
 936                 goto drop_unlock;
 937         }
 938
 939         /* Parse extensions */
 940         if (ext_len >= 4 &&
 941             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
 942                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
 943                 u8 *ext;
 944
 945 #ifdef IPCONFIG_DHCP
 946                 if (ic_proto_enabled & IC_USE_DHCP) {
 947                         __be32 server_id = NONE;
 948                         int mt = 0;
 949
 950                         ext = &b->exten[4];
 951                         while (ext < end && *ext != 0xff) {
 952                                 u8 *opt = ext++;
 953                                 if (*opt == 0)  /* Padding */
 954                                         continue;
 955                                 ext += *ext + 1;
 956                                 if (ext >= end)
 957                                         break;
 958                                 switch (*opt) {
 959                                 case 53:        /* Message type */
 960                                         if (opt[1])
 961                                                 mt = opt[2];
 962                                         break;
 963                                 case 54:        /* Server ID (IP address) */
 964                                         if (opt[1] >= 4)
 965                                                 memcpy(&server_id, opt + 2, 4);
 966                                         break;
 967                                 }
 968                         }
 969
 970 #ifdef IPCONFIG_DEBUG
 971                         printk("DHCP: Got message type %d\n", mt);
 972 #endif
 973
 974                         switch (mt) {
 975                         case DHCPOFFER:
 976                                 /* While in the process of accepting one offer,
 977                                  * ignore all others.
 978                                  */
 979                                 if (ic_myaddr != NONE)
 980                                         goto drop_unlock;
 981
 982                                 /* Let's accept that offer. */
 983                                 ic_myaddr = b->your_ip;
 984                                 ic_servaddr = server_id;
 985 #ifdef IPCONFIG_DEBUG
 986                                 printk("DHCP: Offered address %u.%u.%u.%u",
 987                                        NIPQUAD(ic_myaddr));
 988                                 printk(" by server %u.%u.%u.%u\n",
 989                                        NIPQUAD(ic_servaddr));
 990 #endif
 991                                 /* The DHCP indicated server address takes
 992                                  * precedence over the bootp header one if
 993                                  * they are different.
 994                                  */
 995                                 if ((server_id != NONE) &&
 996                                     (b->server_ip != server_id))
 997                                         b->server_ip = ic_servaddr;
 998                                 break;
 999
1000                         case DHCPACK:
1001                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1002                                         goto drop_unlock;
1003
1004                                 /* Yeah! */
1005                                 break;
1006
1007                         default:
1008                                 /* Urque.  Forget it*/
1009                                 ic_myaddr = NONE;
1010                                 ic_servaddr = NONE;
1011                                 goto drop_unlock;
1012                         }
1013
1014                         ic_dhcp_msgtype = mt;
1015
1016                 }
1017 #endif /* IPCONFIG_DHCP */
1018
1019                 ext = &b->exten[4];
1020                 while (ext < end && *ext != 0xff) {
1021                         u8 *opt = ext++;
1022                         if (*opt == 0)  /* Padding */
1023                                 continue;
1024                         ext += *ext + 1;
1025                         if (ext < end)
1026                                 ic_do_bootp_ext(opt);
1027                 }
1028         }
1029
1030         /* We have a winner! */
1031         ic_dev = dev;
1032         ic_myaddr = b->your_ip;
1033         ic_servaddr = b->server_ip;
1034         if (ic_gateway == NONE && b->relay_ip)
1035                 ic_gateway = b->relay_ip;
1036         if (ic_nameservers[0] == NONE)
1037                 ic_nameservers[0] = ic_servaddr;
1038         ic_got_reply = IC_BOOTP;
1039
1040 drop_unlock:
1041         /* Show's over.  Nothing to see here.  */
1042         spin_unlock(&ic_recv_lock);
1043
1044 drop:
1045         /* Throw the packet out. */
1046         kfree_skb(skb);
1047
1048         return 0;
1049 }
1050
1051
1052 #endif
1053
1054
1055 /*
1056  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1057  */
1058
1059 #ifdef IPCONFIG_DYNAMIC
1060
1061 static int __init ic_dynamic(void)
1062 {
1063         int retries;
1064         struct ic_device *d;
1065         unsigned long start_jiffies, timeout, jiff;
1066         int do_bootp = ic_proto_have_if & IC_BOOTP;
1067         int do_rarp = ic_proto_have_if & IC_RARP;
1068
1069         /*
1070          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1071          * This routine gets only called when some pieces of information
1072          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1073          */
1074         if (!ic_proto_enabled) {
1075                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1076                 return -1;
1077         }
1078
1079 #ifdef IPCONFIG_BOOTP
1080         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1081                 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1082 #endif
1083 #ifdef IPCONFIG_RARP
1084         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1085                 printk(KERN_ERR "RARP: No suitable device found.\n");
1086 #endif
1087
1088         if (!ic_proto_have_if)
1089                 /* Error message already printed */
1090                 return -1;
1091
1092         /*
1093          * Setup protocols
1094          */
1095 #ifdef IPCONFIG_BOOTP
1096         if (do_bootp)
1097                 ic_bootp_init();
1098 #endif
1099 #ifdef IPCONFIG_RARP
1100         if (do_rarp)
1101                 ic_rarp_init();
1102 #endif
1103
1104         /*
1105          * Send requests and wait, until we get an answer. This loop
1106          * seems to be a terrible waste of CPU time, but actually there is
1107          * only one process running at all, so we don't need to use any
1108          * scheduler functions.
1109          * [Actually we could now, but the nothing else running note still
1110          *  applies.. - AC]
1111          */
1112         printk(KERN_NOTICE "Sending %s%s%s requests .",
1113                do_bootp
1114                 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1115                (do_bootp && do_rarp) ? " and " : "",
1116                do_rarp ? "RARP" : "");
1117
1118         start_jiffies = jiffies;
1119         d = ic_first_dev;
1120         retries = CONF_SEND_RETRIES;
1121         get_random_bytes(&timeout, sizeof(timeout));
1122         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1123         for (;;) {
1124 #ifdef IPCONFIG_BOOTP
1125                 if (do_bootp && (d->able & IC_BOOTP))
1126                         ic_bootp_send_if(d, jiffies - start_jiffies);
1127 #endif
1128 #ifdef IPCONFIG_RARP
1129                 if (do_rarp && (d->able & IC_RARP))
1130                         ic_rarp_send_if(d);
1131 #endif
1132
1133                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1134                 while (time_before(jiffies, jiff) && !ic_got_reply)
1135                         schedule_timeout_uninterruptible(1);
1136 #ifdef IPCONFIG_DHCP
1137                 /* DHCP isn't done until we get a DHCPACK. */
1138                 if ((ic_got_reply & IC_BOOTP)
1139                     && (ic_proto_enabled & IC_USE_DHCP)
1140                     && ic_dhcp_msgtype != DHCPACK)
1141                 {
1142                         ic_got_reply = 0;
1143                         printk(",");
1144                         continue;
1145                 }
1146 #endif /* IPCONFIG_DHCP */
1147
1148                 if (ic_got_reply) {
1149                         printk(" OK\n");
1150                         break;
1151                 }
1152
1153                 if ((d = d->next))
1154                         continue;
1155
1156                 if (! --retries) {
1157                         printk(" timed out!\n");
1158                         break;
1159                 }
1160
1161                 d = ic_first_dev;
1162
1163                 timeout = timeout CONF_TIMEOUT_MULT;
1164                 if (timeout > CONF_TIMEOUT_MAX)
1165                         timeout = CONF_TIMEOUT_MAX;
1166
1167                 printk(".");
1168         }
1169
1170 #ifdef IPCONFIG_BOOTP
1171         if (do_bootp)
1172                 ic_bootp_cleanup();
1173 #endif
1174 #ifdef IPCONFIG_RARP
1175         if (do_rarp)
1176                 ic_rarp_cleanup();
1177 #endif
1178
1179         if (!ic_got_reply) {
1180                 ic_myaddr = NONE;
1181                 return -1;
1182         }
1183
1184         printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
1185                 ((ic_got_reply & IC_RARP) ? "RARP"
1186                  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1187                 NIPQUAD(ic_servaddr));
1188         printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
1189
1190         return 0;
1191 }
1192
1193 #endif /* IPCONFIG_DYNAMIC */
1194
1195 #ifdef CONFIG_PROC_FS
1196
1197 static int pnp_seq_show(struct seq_file *seq, void *v)
1198 {
1199         int i;
1200
1201         if (ic_proto_used & IC_PROTO)
1202                 seq_printf(seq, "#PROTO: %s\n",
1203                            (ic_proto_used & IC_RARP) ? "RARP"
1204                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1205         else
1206                 seq_puts(seq, "#MANUAL\n");
1207
1208         if (ic_domain[0])
1209                 seq_printf(seq,
1210                            "domain %s\n", ic_domain);
1211         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1212                 if (ic_nameservers[i] != NONE)
1213                         seq_printf(seq,
1214                                    "nameserver %u.%u.%u.%u\n",
1215                                    NIPQUAD(ic_nameservers[i]));
1216         }
1217         if (ic_servaddr != NONE)
1218                 seq_printf(seq,
1219                            "bootserver %u.%u.%u.%u\n",
1220                            NIPQUAD(ic_servaddr));
1221         return 0;
1222 }
1223
1224 static int pnp_seq_open(struct inode *indoe, struct file *file)
1225 {
1226         return single_open(file, pnp_seq_show, NULL);
1227 }
1228
1229 static const struct file_operations pnp_seq_fops = {
1230         .owner          = THIS_MODULE,
1231         .open           = pnp_seq_open,
1232         .read           = seq_read,
1233         .llseek         = seq_lseek,
1234         .release        = single_release,
1235 };
1236 #endif /* CONFIG_PROC_FS */
1237
1238 /*
1239  *  Extract IP address from the parameter string if needed. Note that we
1240  *  need to have root_server_addr set _before_ IPConfig gets called as it
1241  *  can override it.
1242  */
1243 __be32 __init root_nfs_parse_addr(char *name)
1244 {
1245         __be32 addr;
1246         int octets = 0;
1247         char *cp, *cq;
1248
1249         cp = cq = name;
1250         while (octets < 4) {
1251                 while (*cp >= '0' && *cp <= '9')
1252                         cp++;
1253                 if (cp == cq || cp - cq > 3)
1254                         break;
1255                 if (*cp == '.' || octets == 3)
1256                         octets++;
1257                 if (octets < 4)
1258                         cp++;
1259                 cq = cp;
1260         }
1261         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1262                 if (*cp == ':')
1263                         *cp++ = '\0';
1264                 addr = in_aton(name);
1265                 memmove(name, cp, strlen(cp) + 1);
1266         } else
1267                 addr = NONE;
1268
1269         return addr;
1270 }
1271
1272 /*
1273  *      IP Autoconfig dispatcher.
1274  */
1275
1276 static int __init ip_auto_config(void)
1277 {
1278         __be32 addr;
1279
1280 #ifdef CONFIG_PROC_FS
1281         proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1282 #endif /* CONFIG_PROC_FS */
1283
1284         if (!ic_enable)
1285                 return 0;
1286
1287         DBG(("IP-Config: Entered.\n"));
1288 #ifdef IPCONFIG_DYNAMIC
1289  try_try_again:
1290 #endif
1291         /* Give hardware a chance to settle */
1292         msleep(CONF_PRE_OPEN);
1293
1294         /* Setup all network devices */
1295         if (ic_open_devs() < 0)
1296                 return -1;
1297
1298         /* Give drivers a chance to settle */
1299         ssleep(CONF_POST_OPEN);
1300
1301         /*
1302          * If the config information is insufficient (e.g., our IP address or
1303          * IP address of the boot server is missing or we have multiple network
1304          * interfaces and no default was set), use BOOTP or RARP to get the
1305          * missing values.
1306          */
1307         if (ic_myaddr == NONE ||
1308 #ifdef CONFIG_ROOT_NFS
1309             (root_server_addr == NONE
1310              && ic_servaddr == NONE
1311              && ROOT_DEV == Root_NFS) ||
1312 #endif
1313             ic_first_dev->next) {
1314 #ifdef IPCONFIG_DYNAMIC
1315
1316                 int retries = CONF_OPEN_RETRIES;
1317
1318                 if (ic_dynamic() < 0) {
1319                         ic_close_devs();
1320
1321                         /*
1322                          * I don't know why, but sometimes the
1323                          * eepro100 driver (at least) gets upset and
1324                          * doesn't work the first time it's opened.
1325                          * But then if you close it and reopen it, it
1326                          * works just fine.  So we need to try that at
1327                          * least once before giving up.
1328                          *
1329                          * Also, if the root will be NFS-mounted, we
1330                          * have nowhere to go if DHCP fails.  So we
1331                          * just have to keep trying forever.
1332                          *
1333                          *                              -- Chip
1334                          */
1335 #ifdef CONFIG_ROOT_NFS
1336                         if (ROOT_DEV ==  Root_NFS) {
1337                                 printk(KERN_ERR
1338                                         "IP-Config: Retrying forever (NFS root)...\n");
1339                                 goto try_try_again;
1340                         }
1341 #endif
1342
1343                         if (--retries) {
1344                                 printk(KERN_ERR
1345                                        "IP-Config: Reopening network devices...\n");
1346                                 goto try_try_again;
1347                         }
1348
1349                         /* Oh, well.  At least we tried. */
1350                         printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1351                         return -1;
1352                 }
1353 #else /* !DYNAMIC */
1354                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1355                 ic_close_devs();
1356                 return -1;
1357 #endif /* IPCONFIG_DYNAMIC */
1358         } else {
1359                 /* Device selected manually or only one device -> use it */
1360                 ic_dev = ic_first_dev->dev;
1361         }
1362
1363         addr = root_nfs_parse_addr(root_server_path);
1364         if (root_server_addr == NONE)
1365                 root_server_addr = addr;
1366
1367         /*
1368          * Use defaults whereever applicable.
1369          */
1370         if (ic_defaults() < 0)
1371                 return -1;
1372
1373         /*
1374          * Close all network devices except the device we've
1375          * autoconfigured and set up routes.
1376          */
1377         ic_close_devs();
1378         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1379                 return -1;
1380
1381         /*
1382          * Record which protocol was actually used.
1383          */
1384 #ifdef IPCONFIG_DYNAMIC
1385         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1386 #endif
1387
1388 #ifndef IPCONFIG_SILENT
1389         /*
1390          * Clue in the operator.
1391          */
1392         printk("IP-Config: Complete:");
1393         printk("\n     device=%s", ic_dev->name);
1394         printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
1395         printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
1396         printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
1397         printk(",\n     host=%s, domain=%s, nis-domain=%s",
1398                utsname()->nodename, ic_domain, utsname()->domainname);
1399         printk(",\n     bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
1400         printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
1401         printk(", rootpath=%s", root_server_path);
1402         printk("\n");
1403 #endif /* !SILENT */
1404
1405         return 0;
1406 }
1407
1408 late_initcall(ip_auto_config);
1409
1410
1411 /*
1412  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1413  *  command line parameter.  See Documentation/nfsroot.txt.
1414  */
1415 static int __init ic_proto_name(char *name)
1416 {
1417         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1418                 return 1;
1419         }
1420         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1421                 return 0;
1422         }
1423 #ifdef CONFIG_IP_PNP_DHCP
1424         else if (!strcmp(name, "dhcp")) {
1425                 ic_proto_enabled &= ~IC_RARP;
1426                 return 1;
1427         }
1428 #endif
1429 #ifdef CONFIG_IP_PNP_BOOTP
1430         else if (!strcmp(name, "bootp")) {
1431                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1432                 return 1;
1433         }
1434 #endif
1435 #ifdef CONFIG_IP_PNP_RARP
1436         else if (!strcmp(name, "rarp")) {
1437                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1438                 return 1;
1439         }
1440 #endif
1441 #ifdef IPCONFIG_DYNAMIC
1442         else if (!strcmp(name, "both")) {
1443                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1444                 return 1;
1445         }
1446 #endif
1447         return 0;
1448 }
1449
1450 static int __init ip_auto_config_setup(char *addrs)
1451 {
1452         char *cp, *ip, *dp;
1453         int num = 0;
1454
1455         ic_set_manually = 1;
1456         ic_enable = 1;
1457
1458         /*
1459          * If any dhcp, bootp etc options are set, leave autoconfig on
1460          * and skip the below static IP processing.
1461          */
1462         if (ic_proto_name(addrs))
1463                 return 1;
1464
1465         /* If no static IP is given, turn off autoconfig and bail.  */
1466         if (*addrs == 0 ||
1467             strcmp(addrs, "off") == 0 ||
1468             strcmp(addrs, "none") == 0) {
1469                 ic_enable = 0;
1470                 return 1;
1471         }
1472
1473         /* Parse string for static IP assignment.  */
1474         ip = addrs;
1475         while (ip && *ip) {
1476                 if ((cp = strchr(ip, ':')))
1477                         *cp++ = '\0';
1478                 if (strlen(ip) > 0) {
1479                         DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1480                         switch (num) {
1481                         case 0:
1482                                 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY)
1483                                         ic_myaddr = NONE;
1484                                 break;
1485                         case 1:
1486                                 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
1487                                         ic_servaddr = NONE;
1488                                 break;
1489                         case 2:
1490                                 if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
1491                                         ic_gateway = NONE;
1492                                 break;
1493                         case 3:
1494                                 if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
1495                                         ic_netmask = NONE;
1496                                 break;
1497                         case 4:
1498                                 if ((dp = strchr(ip, '.'))) {
1499                                         *dp++ = '\0';
1500                                         strlcpy(utsname()->domainname, dp,
1501                                                 sizeof(utsname()->domainname));
1502                                 }
1503                                 strlcpy(utsname()->nodename, ip,
1504                                         sizeof(utsname()->nodename));
1505                                 ic_host_name_set = 1;
1506                                 break;
1507                         case 5:
1508                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1509                                 break;
1510                         case 6:
1511                                 if (ic_proto_name(ip) == 0 &&
1512                                     ic_myaddr == NONE) {
1513                                         ic_enable = 0;
1514                                 }
1515                                 break;
1516                         }
1517                 }
1518                 ip = cp;
1519                 num++;
1520         }
1521
1522         return 1;
1523 }
1524
1525 static int __init nfsaddrs_config_setup(char *addrs)
1526 {
1527         return ip_auto_config_setup(addrs);
1528 }
1529
1530 static int __init vendor_class_identifier_setup(char *addrs)
1531 {
1532         if (strlcpy(vendor_class_identifier, addrs,
1533                     sizeof(vendor_class_identifier))
1534             >= sizeof(vendor_class_identifier))
1535                 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1536                        vendor_class_identifier);
1537         return 1;
1538 }
1539
1540 __setup("ip=", ip_auto_config_setup);
1541 __setup("nfsaddrs=", nfsaddrs_config_setup);
1542 __setup("dhcpclass=", vendor_class_identifier_setup);