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/config.h>
  35 #include <linux/types.h>
  36 #include <linux/string.h>
  37 #include <linux/kernel.h>
  38 #include <linux/jiffies.h>
  39 #include <linux/random.h>
  40 #include <linux/init.h>
  41 #include <linux/utsname.h>
  42 #include <linux/in.h>
  43 #include <linux/if.h>
  44 #include <linux/inet.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 <net/arp.h>
  57 #include <net/ip.h>
  58 #include <net/ipconfig.h>
  59
  60 #include <asm/uaccess.h>
  61 #include <net/checksum.h>
  62 #include <asm/processor.h>
  63
  64 /* Define this to allow debugging output */
  65 #undef IPCONFIG_DEBUG
  66
  67 #ifdef IPCONFIG_DEBUG
  68 #define DBG(x) printk x
  69 #else
  70 #define DBG(x) do { } while(0)
  71 #endif
  72
  73 #if defined(CONFIG_IP_PNP_DHCP)
  74 #define IPCONFIG_DHCP
  75 #endif
  76 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
  77 #define IPCONFIG_BOOTP
  78 #endif
  79 #if defined(CONFIG_IP_PNP_RARP)
  80 #define IPCONFIG_RARP
  81 #endif
  82 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
  83 #define IPCONFIG_DYNAMIC
  84 #endif
  85
  86 /* Define the friendly delay before and after opening net devices */
  87 #define CONF_PRE_OPEN           (HZ/2)  /* Before opening: 1/2 second */
  88 #define CONF_POST_OPEN          (1*HZ)  /* After opening: 1 second */
  89
  90 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
  91 #define CONF_OPEN_RETRIES       2       /* (Re)open devices twice */
  92 #define CONF_SEND_RETRIES       6       /* Send six requests per open */
  93 #define CONF_INTER_TIMEOUT      (HZ/2)  /* Inter-device timeout: 1/2 second */
  94 #define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
  95 #define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
  96 #define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
  97 #define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
  98 #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
  99                                            - '3' from resolv.h */
 100
 101
 102 /*
 103  * Public IP configuration
 104  */
 105
 106 /* This is used by platforms which might be able to set the ipconfig
 107  * variables using firmware environment vars.  If this is set, it will
 108  * ignore such firmware variables.
 109  */
 110 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
 111
 112 int ic_enable __initdata = 0;                   /* IP config enabled? */
 113
 114 /* Protocol choice */
 115 int ic_proto_enabled __initdata = 0
 116 #ifdef IPCONFIG_BOOTP
 117                         | IC_BOOTP
 118 #endif
 119 #ifdef CONFIG_IP_PNP_DHCP
 120                         | IC_USE_DHCP
 121 #endif
 122 #ifdef IPCONFIG_RARP
 123                         | IC_RARP
 124 #endif
 125                         ;
 126
 127 int ic_host_name_set __initdata = 0;            /* Host name set by us? */
 128
 129 u32 ic_myaddr = INADDR_NONE;            /* My IP address */
 130 u32 ic_netmask = INADDR_NONE;   /* Netmask for local subnet */
 131 u32 ic_gateway = INADDR_NONE;   /* Gateway IP address */
 132
 133 u32 ic_servaddr = INADDR_NONE;  /* Boot server IP address */
 134
 135 u32 root_server_addr = INADDR_NONE;     /* Address of NFS server */
 136 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
 137
 138 /* Persistent data: */
 139
 140 int ic_proto_used;                      /* Protocol used, if any */
 141 u32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
 142 u8 ic_domain[64];               /* DNS (not NIS) domain name */
 143
 144 /*
 145  * Private state.
 146  */
 147
 148 /* Name of user-selected boot device */
 149 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
 150
 151 /* Protocols supported by available interfaces */
 152 static int ic_proto_have_if __initdata = 0;
 153
 154 #ifdef IPCONFIG_DYNAMIC
 155 static spinlock_t ic_recv_lock = SPIN_LOCK_UNLOCKED;
 156 static volatile int ic_got_reply __initdata = 0;    /* Proto(s) that replied */
 157 #endif
 158 #ifdef IPCONFIG_DHCP
 159 static int ic_dhcp_msgtype __initdata = 0;      /* DHCP msg type received */
 160 #endif
 161
 162
 163 /*
 164  *      Network devices
 165  */
 166
 167 struct ic_device {
 168         struct ic_device *next;
 169         struct net_device *dev;
 170         unsigned short flags;
 171         short able;
 172         u32 xid;
 173 };
 174
 175 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
 176 static struct net_device *ic_dev __initdata = NULL;     /* Selected device */
 177
 178 static int __init ic_open_devs(void)
 179 {
 180         struct ic_device *d, **last;
 181         struct net_device *dev;
 182         unsigned short oflags;
 183
 184         last = &ic_first_dev;
 185         rtnl_shlock();
 186         for (dev = dev_base; dev; dev = dev->next) {
 187                 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
 188                     (!(dev->flags & IFF_LOOPBACK) &&
 189                      (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
 190                      strncmp(dev->name, "dummy", 5))) {
 191                         int able = 0;
 192                         if (dev->mtu >= 364)
 193                                 able |= IC_BOOTP;
 194                         else
 195                                 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
 196                         if (!(dev->flags & IFF_NOARP))
 197                                 able |= IC_RARP;
 198                         able &= ic_proto_enabled;
 199                         if (ic_proto_enabled && !able)
 200                                 continue;
 201                         oflags = dev->flags;
 202                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
 203                                 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
 204                                 continue;
 205                         }
 206                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
 207                                 rtnl_shunlock();
 208                                 return -1;
 209                         }
 210                         d->dev = dev;
 211                         *last = d;
 212                         last = &d->next;
 213                         d->flags = oflags;
 214                         d->able = able;
 215                         if (able & IC_BOOTP)
 216                                 get_random_bytes(&d->xid, sizeof(u32));
 217                         else
 218                                 d->xid = 0;
 219                         ic_proto_have_if |= able;
 220                         DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
 221                                 dev->name, able, d->xid));
 222                 }
 223         }
 224         rtnl_shunlock();
 225
 226         *last = NULL;
 227
 228         if (!ic_first_dev) {
 229                 if (user_dev_name[0])
 230                         printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
 231                 else
 232                         printk(KERN_ERR "IP-Config: No network devices available.\n");
 233                 return -1;
 234         }
 235         return 0;
 236 }
 237
 238 static void __init ic_close_devs(void)
 239 {
 240         struct ic_device *d, *next;
 241         struct net_device *dev;
 242
 243         rtnl_shlock();
 244         next = ic_first_dev;
 245         while ((d = next)) {
 246                 next = d->next;
 247                 dev = d->dev;
 248                 if (dev != ic_dev) {
 249                         DBG(("IP-Config: Downing %s\n", dev->name));
 250                         dev_change_flags(dev, d->flags);
 251                 }
 252                 kfree(d);
 253         }
 254         rtnl_shunlock();
 255 }
 256
 257 /*
 258  *      Interface to various network functions.
 259  */
 260
 261 static inline void
 262 set_sockaddr(struct sockaddr_in *sin, u32 addr, u16 port)
 263 {
 264         sin->sin_family = AF_INET;
 265         sin->sin_addr.s_addr = addr;
 266         sin->sin_port = port;
 267 }
 268
 269 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
 270 {
 271         int res;
 272
 273         mm_segment_t oldfs = get_fs();
 274         set_fs(get_ds());
 275         res = devinet_ioctl(cmd, arg);
 276         set_fs(oldfs);
 277         return res;
 278 }
 279
 280 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
 281 {
 282         int res;
 283
 284         mm_segment_t oldfs = get_fs();
 285         set_fs(get_ds());
 286         res = ip_rt_ioctl(cmd, arg);
 287         set_fs(oldfs);
 288         return res;
 289 }
 290
 291 /*
 292  *      Set up interface addresses and routes.
 293  */
 294
 295 static int __init ic_setup_if(void)
 296 {
 297         struct ifreq ir;
 298         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
 299         int err;
 300
 301         memset(&ir, 0, sizeof(ir));
 302         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
 303         set_sockaddr(sin, ic_myaddr, 0);
 304         if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
 305                 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
 306                 return -1;
 307         }
 308         set_sockaddr(sin, ic_netmask, 0);
 309         if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
 310                 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
 311                 return -1;
 312         }
 313         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
 314         if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
 315                 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
 316                 return -1;
 317         }
 318         return 0;
 319 }
 320
 321 static int __init ic_setup_routes(void)
 322 {
 323         /* No need to setup device routes, only the default route... */
 324
 325         if (ic_gateway != INADDR_NONE) {
 326                 struct rtentry rm;
 327                 int err;
 328
 329                 memset(&rm, 0, sizeof(rm));
 330                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
 331                         printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
 332                         return -1;
 333                 }
 334                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
 335                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
 336                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
 337                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
 338                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
 339                         printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
 340                         return -1;
 341                 }
 342         }
 343
 344         return 0;
 345 }
 346
 347 /*
 348  *      Fill in default values for all missing parameters.
 349  */
 350
 351 static int __init ic_defaults(void)
 352 {
 353         /*
 354          *      At this point we have no userspace running so need not
 355          *      claim locks on system_utsname
 356          */
 357
 358         if (!ic_host_name_set)
 359                 sprintf(system_utsname.nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr));
 360
 361         if (root_server_addr == INADDR_NONE)
 362                 root_server_addr = ic_servaddr;
 363
 364         if (ic_netmask == INADDR_NONE) {
 365                 if (IN_CLASSA(ntohl(ic_myaddr)))
 366                         ic_netmask = htonl(IN_CLASSA_NET);
 367                 else if (IN_CLASSB(ntohl(ic_myaddr)))
 368                         ic_netmask = htonl(IN_CLASSB_NET);
 369                 else if (IN_CLASSC(ntohl(ic_myaddr)))
 370                         ic_netmask = htonl(IN_CLASSC_NET);
 371                 else {
 372                         printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n",
 373                                 NIPQUAD(ic_myaddr));
 374                         return -1;
 375                 }
 376                 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask));
 377         }
 378
 379         return 0;
 380 }
 381
 382 /*
 383  *      RARP support.
 384  */
 385
 386 #ifdef IPCONFIG_RARP
 387
 388 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt);
 389
 390 static struct packet_type rarp_packet_type __initdata = {
 391         .type = __constant_htons(ETH_P_RARP),
 392         .func = ic_rarp_recv,
 393 };
 394
 395 static inline void ic_rarp_init(void)
 396 {
 397         dev_add_pack(&rarp_packet_type);
 398 }
 399
 400 static inline void ic_rarp_cleanup(void)
 401 {
 402         dev_remove_pack(&rarp_packet_type);
 403 }
 404
 405 /*
 406  *  Process received RARP packet.
 407  */
 408 static int __init
 409 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
 410 {
 411         struct arphdr *rarp;
 412         unsigned char *rarp_ptr;
 413         unsigned long sip, tip;
 414         unsigned char *sha, *tha;               /* s for "source", t for "target" */
 415         struct ic_device *d;
 416
 417         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 418                 return NET_RX_DROP;
 419
 420         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
 421                 goto drop;
 422
 423         /* Basic sanity checks can be done without the lock.  */
 424         rarp = (struct arphdr *)skb->h.raw;
 425
 426         /* If this test doesn't pass, it's not IP, or we should
 427          * ignore it anyway.
 428          */
 429         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
 430                 goto drop;
 431
 432         /* If it's not a RARP reply, delete it. */
 433         if (rarp->ar_op != htons(ARPOP_RREPLY))
 434                 goto drop;
 435
 436         /* If it's not Ethernet, delete it. */
 437         if (rarp->ar_pro != htons(ETH_P_IP))
 438                 goto drop;
 439
 440         if (!pskb_may_pull(skb,
 441                            sizeof(struct arphdr) +
 442                            (2 * dev->addr_len) +
 443                            (2 * 4)))
 444                 goto drop;
 445
 446         /* OK, it is all there and looks valid, process... */
 447         rarp = (struct arphdr *)skb->h.raw;
 448         rarp_ptr = (unsigned char *) (rarp + 1);
 449
 450         /* One reply at a time, please. */
 451         spin_lock(&ic_recv_lock);
 452
 453         /* If we already have a reply, just drop the packet */
 454         if (ic_got_reply)
 455                 goto drop_unlock;
 456
 457         /* Find the ic_device that the packet arrived on */
 458         d = ic_first_dev;
 459         while (d && d->dev != dev)
 460                 d = d->next;
 461         if (!d)
 462                 goto drop_unlock;       /* should never happen */
 463
 464         /* Extract variable-width fields */
 465         sha = rarp_ptr;
 466         rarp_ptr += dev->addr_len;
 467         memcpy(&sip, rarp_ptr, 4);
 468         rarp_ptr += 4;
 469         tha = rarp_ptr;
 470         rarp_ptr += dev->addr_len;
 471         memcpy(&tip, rarp_ptr, 4);
 472
 473         /* Discard packets which are not meant for us. */
 474         if (memcmp(tha, dev->dev_addr, dev->addr_len))
 475                 goto drop_unlock;
 476
 477         /* Discard packets which are not from specified server. */
 478         if (ic_servaddr != INADDR_NONE && ic_servaddr != sip)
 479                 goto drop_unlock;
 480
 481         /* We have a winner! */
 482         ic_dev = dev;
 483         if (ic_myaddr == INADDR_NONE)
 484                 ic_myaddr = tip;
 485         ic_servaddr = sip;
 486         ic_got_reply = IC_RARP;
 487
 488 drop_unlock:
 489         /* Show's over.  Nothing to see here.  */
 490         spin_unlock(&ic_recv_lock);
 491
 492 drop:
 493         /* Throw the packet out. */
 494         kfree_skb(skb);
 495         return 0;
 496 }
 497
 498
 499 /*
 500  *  Send RARP request packet over a single interface.
 501  */
 502 static void __init ic_rarp_send_if(struct ic_device *d)
 503 {
 504         struct net_device *dev = d->dev;
 505         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
 506                  dev->dev_addr, dev->dev_addr);
 507 }
 508 #endif
 509
 510 /*
 511  *      DHCP/BOOTP support.
 512  */
 513
 514 #ifdef IPCONFIG_BOOTP
 515
 516 struct bootp_pkt {              /* BOOTP packet format */
 517         struct iphdr iph;       /* IP header */
 518         struct udphdr udph;     /* UDP header */
 519         u8 op;                  /* 1=request, 2=reply */
 520         u8 htype;               /* HW address type */
 521         u8 hlen;                /* HW address length */
 522         u8 hops;                /* Used only by gateways */
 523         u32 xid;                /* Transaction ID */
 524         u16 secs;               /* Seconds since we started */
 525         u16 flags;              /* Just what it says */
 526         u32 client_ip;          /* Client's IP address if known */
 527         u32 your_ip;            /* Assigned IP address */
 528         u32 server_ip;          /* (Next, e.g. NFS) Server's IP address */
 529         u32 relay_ip;           /* IP address of BOOTP relay */
 530         u8 hw_addr[16];         /* Client's HW address */
 531         u8 serv_name[64];       /* Server host name */
 532         u8 boot_file[128];      /* Name of boot file */
 533         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
 534 };
 535
 536 /* packet ops */
 537 #define BOOTP_REQUEST   1
 538 #define BOOTP_REPLY     2
 539
 540 /* DHCP message types */
 541 #define DHCPDISCOVER    1
 542 #define DHCPOFFER       2
 543 #define DHCPREQUEST     3
 544 #define DHCPDECLINE     4
 545 #define DHCPACK         5
 546 #define DHCPNAK         6
 547 #define DHCPRELEASE     7
 548 #define DHCPINFORM      8
 549
 550 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt);
 551
 552 static struct packet_type bootp_packet_type __initdata = {
 553         .type = __constant_htons(ETH_P_IP),
 554         .func = ic_bootp_recv,
 555 };
 556
 557
 558 /*
 559  *  Initialize DHCP/BOOTP extension fields in the request.
 560  */
 561
 562 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
 563
 564 #ifdef IPCONFIG_DHCP
 565
 566 static void __init
 567 ic_dhcp_init_options(u8 *options)
 568 {
 569         u8 mt = ((ic_servaddr == INADDR_NONE)
 570                  ? DHCPDISCOVER : DHCPREQUEST);
 571         u8 *e = options;
 572
 573 #ifdef IPCONFIG_DEBUG
 574         printk("DHCP: Sending message type %d\n", mt);
 575 #endif
 576
 577         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 578         e += 4;
 579
 580         *e++ = 53;              /* DHCP message type */
 581         *e++ = 1;
 582         *e++ = mt;
 583
 584         if (mt == DHCPREQUEST) {
 585                 *e++ = 54;      /* Server ID (IP address) */
 586                 *e++ = 4;
 587                 memcpy(e, &ic_servaddr, 4);
 588                 e += 4;
 589
 590                 *e++ = 50;      /* Requested IP address */
 591                 *e++ = 4;
 592                 memcpy(e, &ic_myaddr, 4);
 593                 e += 4;
 594         }
 595
 596         /* always? */
 597         {
 598                 static const u8 ic_req_params[] = {
 599                         1,      /* Subnet mask */
 600                         3,      /* Default gateway */
 601                         6,      /* DNS server */
 602                         12,     /* Host name */
 603                         15,     /* Domain name */
 604                         17,     /* Boot path */
 605                         40,     /* NIS domain name */
 606                 };
 607
 608                 *e++ = 55;      /* Parameter request list */
 609                 *e++ = sizeof(ic_req_params);
 610                 memcpy(e, ic_req_params, sizeof(ic_req_params));
 611                 e += sizeof(ic_req_params);
 612         }
 613
 614         *e++ = 255;     /* End of the list */
 615 }
 616
 617 #endif /* IPCONFIG_DHCP */
 618
 619 static void __init ic_bootp_init_ext(u8 *e)
 620 {
 621         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 622         e += 4;
 623         *e++ = 1;               /* Subnet mask request */
 624         *e++ = 4;
 625         e += 4;
 626         *e++ = 3;               /* Default gateway request */
 627         *e++ = 4;
 628         e += 4;
 629         *e++ = 5;               /* Name server request */
 630         *e++ = 8;
 631         e += 8;
 632         *e++ = 12;              /* Host name request */
 633         *e++ = 32;
 634         e += 32;
 635         *e++ = 40;              /* NIS Domain name request */
 636         *e++ = 32;
 637         e += 32;
 638         *e++ = 17;              /* Boot path */
 639         *e++ = 40;
 640         e += 40;
 641
 642         *e++ = 57;              /* set extension buffer size for reply */
 643         *e++ = 2;
 644         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
 645         *e++ = 150;
 646
 647         *e++ = 255;             /* End of the list */
 648 }
 649
 650
 651 /*
 652  *  Initialize the DHCP/BOOTP mechanism.
 653  */
 654 static inline void ic_bootp_init(void)
 655 {
 656         int i;
 657
 658         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
 659                 ic_nameservers[i] = INADDR_NONE;
 660
 661         dev_add_pack(&bootp_packet_type);
 662 }
 663
 664
 665 /*
 666  *  DHCP/BOOTP cleanup.
 667  */
 668 static inline void ic_bootp_cleanup(void)
 669 {
 670         dev_remove_pack(&bootp_packet_type);
 671 }
 672
 673
 674 /*
 675  *  Send DHCP/BOOTP request to single interface.
 676  */
 677 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
 678 {
 679         struct net_device *dev = d->dev;
 680         struct sk_buff *skb;
 681         struct bootp_pkt *b;
 682         int hh_len = LL_RESERVED_SPACE(dev);
 683         struct iphdr *h;
 684
 685         /* Allocate packet */
 686         skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
 687         if (!skb)
 688                 return;
 689         skb_reserve(skb, hh_len);
 690         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
 691         memset(b, 0, sizeof(struct bootp_pkt));
 692
 693         /* Construct IP header */
 694         skb->nh.iph = h = &b->iph;
 695         h->version = 4;
 696         h->ihl = 5;
 697         h->tot_len = htons(sizeof(struct bootp_pkt));
 698         h->frag_off = htons(IP_DF);
 699         h->ttl = 64;
 700         h->protocol = IPPROTO_UDP;
 701         h->daddr = INADDR_BROADCAST;
 702         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
 703
 704         /* Construct UDP header */
 705         b->udph.source = htons(68);
 706         b->udph.dest = htons(67);
 707         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
 708         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
 709
 710         /* Construct DHCP/BOOTP header */
 711         b->op = BOOTP_REQUEST;
 712         if (dev->type < 256) /* check for false types */
 713                 b->htype = dev->type;
 714         else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
 715                 b->htype = ARPHRD_IEEE802;
 716         else {
 717                 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
 718                 b->htype = dev->type; /* can cause undefined behavior */
 719         }
 720         b->hlen = dev->addr_len;
 721         b->your_ip = INADDR_NONE;
 722         b->server_ip = INADDR_NONE;
 723         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
 724         b->secs = htons(jiffies_diff / HZ);
 725         b->xid = d->xid;
 726
 727         /* add DHCP options or BOOTP extensions */
 728 #ifdef IPCONFIG_DHCP
 729         if (ic_proto_enabled & IC_USE_DHCP)
 730                 ic_dhcp_init_options(b->exten);
 731         else
 732 #endif
 733                 ic_bootp_init_ext(b->exten);
 734
 735         /* Chain packet down the line... */
 736         skb->dev = dev;
 737         skb->protocol = htons(ETH_P_IP);
 738         if ((dev->hard_header &&
 739              dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) ||
 740             dev_queue_xmit(skb) < 0)
 741                 printk("E");
 742 }
 743
 744
 745 /*
 746  *  Copy BOOTP-supplied string if not already set.
 747  */
 748 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
 749 {
 750         if (!len)
 751                 return 0;
 752         if (len > max-1)
 753                 len = max-1;
 754         memcpy(dest, src, len);
 755         dest[len] = '\0';
 756         return 1;
 757 }
 758
 759
 760 /*
 761  *  Process BOOTP extensions.
 762  */
 763 static void __init ic_do_bootp_ext(u8 *ext)
 764 {
 765        u8 servers;
 766        int i;
 767
 768 #ifdef IPCONFIG_DEBUG
 769         u8 *c;
 770
 771         printk("DHCP/BOOTP: Got extension %d:",*ext);
 772         for(c=ext+2; c<ext+2+ext[1]; c++)
 773                 printk(" %02x", *c);
 774         printk("\n");
 775 #endif
 776
 777         switch (*ext++) {
 778                 case 1:         /* Subnet mask */
 779                         if (ic_netmask == INADDR_NONE)
 780                                 memcpy(&ic_netmask, ext+1, 4);
 781                         break;
 782                 case 3:         /* Default gateway */
 783                         if (ic_gateway == INADDR_NONE)
 784                                 memcpy(&ic_gateway, ext+1, 4);
 785                         break;
 786                 case 6:         /* DNS server */
 787                         servers= *ext/4;
 788                         if (servers > CONF_NAMESERVERS_MAX)
 789                                 servers = CONF_NAMESERVERS_MAX;
 790                         for (i = 0; i < servers; i++) {
 791                                 if (ic_nameservers[i] == INADDR_NONE)
 792                                         memcpy(&ic_nameservers[i], ext+1+4*i, 4);
 793                         }
 794                         break;
 795                 case 12:        /* Host name */
 796                         ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN);
 797                         ic_host_name_set = 1;
 798                         break;
 799                 case 15:        /* Domain name (DNS) */
 800                         ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
 801                         break;
 802                 case 17:        /* Root path */
 803                         if (!root_server_path[0])
 804                                 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
 805                         break;
 806                 case 40:        /* NIS Domain name (_not_ DNS) */
 807                         ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN);
 808                         break;
 809         }
 810 }
 811
 812
 813 /*
 814  *  Receive BOOTP reply.
 815  */
 816 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
 817 {
 818         struct bootp_pkt *b;
 819         struct iphdr *h;
 820         struct ic_device *d;
 821         int len;
 822
 823         /* Perform verifications before taking the lock.  */
 824         if (skb->pkt_type == PACKET_OTHERHOST)
 825                 goto drop;
 826
 827         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 828                 return NET_RX_DROP;
 829
 830         if (!pskb_may_pull(skb,
 831                            sizeof(struct iphdr) +
 832                            sizeof(struct udphdr)))
 833                 goto drop;
 834
 835         b = (struct bootp_pkt *) skb->nh.iph;
 836         h = &b->iph;
 837
 838         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
 839                 goto drop;
 840
 841         /* Fragments are not supported */
 842         if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
 843                 if (net_ratelimit())
 844                         printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
 845                                "reply.\n");
 846                 goto drop;
 847         }
 848
 849         if (skb->len < ntohs(h->tot_len))
 850                 goto drop;
 851
 852         if (ip_fast_csum((char *) h, h->ihl))
 853                 goto drop;
 854
 855         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
 856                 goto drop;
 857
 858         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
 859                 goto drop;
 860
 861         len = ntohs(b->udph.len) - sizeof(struct udphdr);
 862         if (len < 300)
 863                 goto drop;
 864
 865         /* Ok the front looks good, make sure we can get at the rest.  */
 866         if (!pskb_may_pull(skb, skb->len))
 867                 goto drop;
 868
 869         b = (struct bootp_pkt *) skb->nh.iph;
 870         h = &b->iph;
 871
 872         /* One reply at a time, please. */
 873         spin_lock(&ic_recv_lock);
 874
 875         /* If we already have a reply, just drop the packet */
 876         if (ic_got_reply)
 877                 goto drop_unlock;
 878
 879         /* Find the ic_device that the packet arrived on */
 880         d = ic_first_dev;
 881         while (d && d->dev != dev)
 882                 d = d->next;
 883         if (!d)
 884                 goto drop_unlock;  /* should never happen */
 885
 886         /* Is it a reply to our BOOTP request? */
 887         if (b->op != BOOTP_REPLY ||
 888             b->xid != d->xid) {
 889                 if (net_ratelimit())
 890                         printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
 891                                "op[%x] xid[%x]\n",
 892                                b->op, b->xid);
 893                 goto drop_unlock;
 894         }
 895
 896         /* Parse extensions */
 897         if (!memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
 898                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
 899                 u8 *ext;
 900
 901 #ifdef IPCONFIG_DHCP
 902                 if (ic_proto_enabled & IC_USE_DHCP) {
 903                         u32 server_id = INADDR_NONE;
 904                         int mt = 0;
 905
 906                         ext = &b->exten[4];
 907                         while (ext < end && *ext != 0xff) {
 908                                 u8 *opt = ext++;
 909                                 if (*opt == 0)  /* Padding */
 910                                         continue;
 911                                 ext += *ext + 1;
 912                                 if (ext >= end)
 913                                         break;
 914                                 switch (*opt) {
 915                                 case 53:        /* Message type */
 916                                         if (opt[1])
 917                                                 mt = opt[2];
 918                                         break;
 919                                 case 54:        /* Server ID (IP address) */
 920                                         if (opt[1] >= 4)
 921                                                 memcpy(&server_id, opt + 2, 4);
 922                                         break;
 923                                 };
 924                         }
 925
 926 #ifdef IPCONFIG_DEBUG
 927                         printk("DHCP: Got message type %d\n", mt);
 928 #endif
 929
 930                         switch (mt) {
 931                         case DHCPOFFER:
 932                                 /* While in the process of accepting one offer,
 933                                  * ignore all others.
 934                                  */
 935                                 if (ic_myaddr != INADDR_NONE)
 936                                         goto drop_unlock;
 937
 938                                 /* Let's accept that offer. */
 939                                 ic_myaddr = b->your_ip;
 940                                 ic_servaddr = server_id;
 941 #ifdef IPCONFIG_DEBUG
 942                                 printk("DHCP: Offered address %u.%u.%u.%u",
 943                                        NIPQUAD(ic_myaddr));
 944                                 printk(" by server %u.%u.%u.%u\n",
 945                                        NIPQUAD(ic_servaddr));
 946 #endif
 947                                 /* The DHCP indicated server address takes
 948                                  * precedence over the bootp header one if
 949                                  * they are different.
 950                                  */
 951                                 if ((server_id != INADDR_NONE) &&
 952                                     (b->server_ip != server_id))
 953                                         b->server_ip = ic_servaddr;
 954                                 break;
 955
 956                         case DHCPACK:
 957                                 /* Yeah! */
 958                                 break;
 959
 960                         default:
 961                                 /* Urque.  Forget it*/
 962                                 ic_myaddr = INADDR_NONE;
 963                                 ic_servaddr = INADDR_NONE;
 964                                 goto drop_unlock;
 965                         };
 966
 967                         ic_dhcp_msgtype = mt;
 968
 969                 }
 970 #endif /* IPCONFIG_DHCP */
 971
 972                 ext = &b->exten[4];
 973                 while (ext < end && *ext != 0xff) {
 974                         u8 *opt = ext++;
 975                         if (*opt == 0)  /* Padding */
 976                                 continue;
 977                         ext += *ext + 1;
 978                         if (ext < end)
 979                                 ic_do_bootp_ext(opt);
 980                 }
 981         }
 982
 983         /* We have a winner! */
 984         ic_dev = dev;
 985         ic_myaddr = b->your_ip;
 986         ic_servaddr = b->server_ip;
 987         if (ic_gateway == INADDR_NONE && b->relay_ip)
 988                 ic_gateway = b->relay_ip;
 989         if (ic_nameservers[0] == INADDR_NONE)
 990                 ic_nameservers[0] = ic_servaddr;
 991         ic_got_reply = IC_BOOTP;
 992
 993 drop_unlock:
 994         /* Show's over.  Nothing to see here.  */
 995         spin_unlock(&ic_recv_lock);
 996
 997 drop:
 998         /* Throw the packet out. */
 999         kfree_skb(skb);
1000
1001         return 0;
1002 }
1003
1004
1005 #endif
1006
1007
1008 /*
1009  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1010  */
1011
1012 #ifdef IPCONFIG_DYNAMIC
1013
1014 static int __init ic_dynamic(void)
1015 {
1016         int retries;
1017         struct ic_device *d;
1018         unsigned long start_jiffies, timeout, jiff;
1019         int do_bootp = ic_proto_have_if & IC_BOOTP;
1020         int do_rarp = ic_proto_have_if & IC_RARP;
1021
1022         /*
1023          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1024          * This routine gets only called when some pieces of information
1025          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1026          */
1027         if (!ic_proto_enabled) {
1028                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1029                 return -1;
1030         }
1031
1032 #ifdef IPCONFIG_BOOTP
1033         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1034                 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1035 #endif
1036 #ifdef IPCONFIG_RARP
1037         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1038                 printk(KERN_ERR "RARP: No suitable device found.\n");
1039 #endif
1040
1041         if (!ic_proto_have_if)
1042                 /* Error message already printed */
1043                 return -1;
1044
1045         /*
1046          * Setup protocols
1047          */
1048 #ifdef IPCONFIG_BOOTP
1049         if (do_bootp)
1050                 ic_bootp_init();
1051 #endif
1052 #ifdef IPCONFIG_RARP
1053         if (do_rarp)
1054                 ic_rarp_init();
1055 #endif
1056
1057         /*
1058          * Send requests and wait, until we get an answer. This loop
1059          * seems to be a terrible waste of CPU time, but actually there is
1060          * only one process running at all, so we don't need to use any
1061          * scheduler functions.
1062          * [Actually we could now, but the nothing else running note still
1063          *  applies.. - AC]
1064          */
1065         printk(KERN_NOTICE "Sending %s%s%s requests .",
1066                do_bootp
1067                 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1068                (do_bootp && do_rarp) ? " and " : "",
1069                do_rarp ? "RARP" : "");
1070
1071         start_jiffies = jiffies;
1072         d = ic_first_dev;
1073         retries = CONF_SEND_RETRIES;
1074         get_random_bytes(&timeout, sizeof(timeout));
1075         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1076         for(;;) {
1077 #ifdef IPCONFIG_BOOTP
1078                 if (do_bootp && (d->able & IC_BOOTP))
1079                         ic_bootp_send_if(d, jiffies - start_jiffies);
1080 #endif
1081 #ifdef IPCONFIG_RARP
1082                 if (do_rarp && (d->able & IC_RARP))
1083                         ic_rarp_send_if(d);
1084 #endif
1085
1086                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1087                 while (time_before(jiffies, jiff) && !ic_got_reply) {
1088                         barrier();
1089                         cpu_relax();
1090                 }
1091 #ifdef IPCONFIG_DHCP
1092                 /* DHCP isn't done until we get a DHCPACK. */
1093                 if ((ic_got_reply & IC_BOOTP)
1094                     && (ic_proto_enabled & IC_USE_DHCP)
1095                     && ic_dhcp_msgtype != DHCPACK)
1096                 {
1097                         ic_got_reply = 0;
1098                         printk(",");
1099                         continue;
1100                 }
1101 #endif /* IPCONFIG_DHCP */
1102
1103                 if (ic_got_reply) {
1104                         printk(" OK\n");
1105                         break;
1106                 }
1107
1108                 if ((d = d->next))
1109                         continue;
1110
1111                 if (! --retries) {
1112                         printk(" timed out!\n");
1113                         break;
1114                 }
1115
1116                 d = ic_first_dev;
1117
1118                 timeout = timeout CONF_TIMEOUT_MULT;
1119                 if (timeout > CONF_TIMEOUT_MAX)
1120                         timeout = CONF_TIMEOUT_MAX;
1121
1122                 printk(".");
1123         }
1124
1125 #ifdef IPCONFIG_BOOTP
1126         if (do_bootp)
1127                 ic_bootp_cleanup();
1128 #endif
1129 #ifdef IPCONFIG_RARP
1130         if (do_rarp)
1131                 ic_rarp_cleanup();
1132 #endif
1133
1134         if (!ic_got_reply)
1135                 return -1;
1136
1137         printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
1138                 ((ic_got_reply & IC_RARP) ? "RARP"
1139                  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1140                 NIPQUAD(ic_servaddr));
1141         printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
1142
1143         return 0;
1144 }
1145
1146 #endif /* IPCONFIG_DYNAMIC */
1147
1148 #ifdef CONFIG_PROC_FS
1149
1150 static int pnp_seq_show(struct seq_file *seq, void *v)
1151 {
1152         int i;
1153
1154         if (ic_proto_used & IC_PROTO)
1155                 seq_printf(seq, "#PROTO: %s\n",
1156                            (ic_proto_used & IC_RARP) ? "RARP"
1157                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1158         else
1159                 seq_puts(seq, "#MANUAL\n");
1160
1161         if (ic_domain[0])
1162                 seq_printf(seq,
1163                            "domain %s\n", ic_domain);
1164         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1165                 if (ic_nameservers[i] != INADDR_NONE)
1166                         seq_printf(seq,
1167                                    "nameserver %u.%u.%u.%u\n",
1168                                    NIPQUAD(ic_nameservers[i]));
1169         }
1170         if (ic_servaddr != INADDR_NONE)
1171                 seq_printf(seq,
1172                            "bootserver %u.%u.%u.%u\n",
1173                            NIPQUAD(ic_servaddr));
1174         return 0;
1175 }
1176
1177 static int pnp_seq_open(struct inode *indoe, struct file *file)
1178 {
1179         return single_open(file, pnp_seq_show, NULL);
1180 }
1181
1182 static struct file_operations pnp_seq_fops = {
1183         .owner          = THIS_MODULE,
1184         .open           = pnp_seq_open,
1185         .read           = seq_read,
1186         .llseek         = seq_lseek,
1187         .release        = single_release,
1188 };
1189 #endif /* CONFIG_PROC_FS */
1190
1191 /*
1192  *  Extract IP address from the parameter string if needed. Note that we
1193  *  need to have root_server_addr set _before_ IPConfig gets called as it
1194  *  can override it.
1195  */
1196 u32 __init root_nfs_parse_addr(char *name)
1197 {
1198         u32 addr;
1199         int octets = 0;
1200         char *cp, *cq;
1201
1202         cp = cq = name;
1203         while (octets < 4) {
1204                 while (*cp >= '0' && *cp <= '9')
1205                         cp++;
1206                 if (cp == cq || cp - cq > 3)
1207                         break;
1208                 if (*cp == '.' || octets == 3)
1209                         octets++;
1210                 if (octets < 4)
1211                         cp++;
1212                 cq = cp;
1213         }
1214         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1215                 if (*cp == ':')
1216                         *cp++ = '\0';
1217                 addr = in_aton(name);
1218                 strcpy(name, cp);
1219         } else
1220                 addr = INADDR_NONE;
1221
1222         return addr;
1223 }
1224
1225 /*
1226  *      IP Autoconfig dispatcher.
1227  */
1228
1229 static int __init ip_auto_config(void)
1230 {
1231         unsigned long jiff;
1232         u32 addr;
1233
1234 #ifdef CONFIG_PROC_FS
1235         proc_net_fops_create("pnp", S_IRUGO, &pnp_seq_fops);
1236 #endif /* CONFIG_PROC_FS */
1237
1238         if (!ic_enable)
1239                 return 0;
1240
1241         DBG(("IP-Config: Entered.\n"));
1242 #ifdef IPCONFIG_DYNAMIC
1243  try_try_again:
1244 #endif
1245         /* Give hardware a chance to settle */
1246         jiff = jiffies + CONF_PRE_OPEN;
1247         while (time_before(jiffies, jiff))
1248                 cpu_relax();
1249
1250         /* Setup all network devices */
1251         if (ic_open_devs() < 0)
1252                 return -1;
1253
1254         /* Give drivers a chance to settle */
1255         jiff = jiffies + CONF_POST_OPEN;
1256         while (time_before(jiffies, jiff))
1257                 cpu_relax();
1258
1259         /*
1260          * If the config information is insufficient (e.g., our IP address or
1261          * IP address of the boot server is missing or we have multiple network
1262          * interfaces and no default was set), use BOOTP or RARP to get the
1263          * missing values.
1264          */
1265         if (ic_myaddr == INADDR_NONE ||
1266 #ifdef CONFIG_ROOT_NFS
1267             (MAJOR(ROOT_DEV) == UNNAMED_MAJOR
1268              && root_server_addr == INADDR_NONE
1269              && ic_servaddr == INADDR_NONE) ||
1270 #endif
1271             ic_first_dev->next) {
1272 #ifdef IPCONFIG_DYNAMIC
1273
1274                 int retries = CONF_OPEN_RETRIES;
1275
1276                 if (ic_dynamic() < 0) {
1277                         ic_close_devs();
1278
1279                         /*
1280                          * I don't know why, but sometimes the
1281                          * eepro100 driver (at least) gets upset and
1282                          * doesn't work the first time it's opened.
1283                          * But then if you close it and reopen it, it
1284                          * works just fine.  So we need to try that at
1285                          * least once before giving up.
1286                          *
1287                          * Also, if the root will be NFS-mounted, we
1288                          * have nowhere to go if DHCP fails.  So we
1289                          * just have to keep trying forever.
1290                          *
1291                          *                              -- Chip
1292                          */
1293 #ifdef CONFIG_ROOT_NFS
1294                         if (ROOT_DEV ==  Root_NFS) {
1295                                 printk(KERN_ERR
1296                                         "IP-Config: Retrying forever (NFS root)...\n");
1297                                 goto try_try_again;
1298                         }
1299 #endif
1300
1301                         if (--retries) {
1302                                 printk(KERN_ERR
1303                                        "IP-Config: Reopening network devices...\n");
1304                                 goto try_try_again;
1305                         }
1306
1307                         /* Oh, well.  At least we tried. */
1308                         printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1309                         return -1;
1310                 }
1311 #else /* !DYNAMIC */
1312                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1313                 ic_close_devs();
1314                 return -1;
1315 #endif /* IPCONFIG_DYNAMIC */
1316         } else {
1317                 /* Device selected manually or only one device -> use it */
1318                 ic_dev = ic_first_dev->dev;
1319         }
1320
1321         addr = root_nfs_parse_addr(root_server_path);
1322         if (root_server_addr == INADDR_NONE)
1323                 root_server_addr = addr;
1324
1325         /*
1326          * Use defaults whereever applicable.
1327          */
1328         if (ic_defaults() < 0)
1329                 return -1;
1330
1331         /*
1332          * Close all network devices except the device we've
1333          * autoconfigured and set up routes.
1334          */
1335         ic_close_devs();
1336         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1337                 return -1;
1338
1339         /*
1340          * Record which protocol was actually used.
1341          */
1342 #ifdef IPCONFIG_DYNAMIC
1343         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1344 #endif
1345
1346 #ifndef IPCONFIG_SILENT
1347         /*
1348          * Clue in the operator.
1349          */
1350         printk("IP-Config: Complete:");
1351         printk("\n      device=%s", ic_dev->name);
1352         printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
1353         printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
1354         printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
1355         printk(",\n     host=%s, domain=%s, nis-domain=%s",
1356                system_utsname.nodename, ic_domain, system_utsname.domainname);
1357         printk(",\n     bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
1358         printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
1359         printk(", rootpath=%s", root_server_path);
1360         printk("\n");
1361 #endif /* !SILENT */
1362
1363         return 0;
1364 }
1365
1366 late_initcall(ip_auto_config);
1367
1368
1369 /*
1370  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1371  *  command line parameter. It consists of option fields separated by colons in
1372  *  the following order:
1373  *
1374  *  <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO>
1375  *
1376  *  Any of the fields can be empty which means to use a default value:
1377  *      <client-ip>     - address given by BOOTP or RARP
1378  *      <server-ip>     - address of host returning BOOTP or RARP packet
1379  *      <gw-ip>         - none, or the address returned by BOOTP
1380  *      <netmask>       - automatically determined from <client-ip>, or the
1381  *                        one returned by BOOTP
1382  *      <host name>     - <client-ip> in ASCII notation, or the name returned
1383  *                        by BOOTP
1384  *      <device>        - use all available devices
1385  *      <PROTO>:
1386  *         off|none         - don't do autoconfig at all (DEFAULT)
1387  *         on|any           - use any configured protocol
1388  *         dhcp|bootp|rarp  - use only the specified protocol
1389  *         both             - use both BOOTP and RARP (not DHCP)
1390  */
1391 static int __init ic_proto_name(char *name)
1392 {
1393         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1394                 return 1;
1395         }
1396 #ifdef CONFIG_IP_PNP_DHCP
1397         else if (!strcmp(name, "dhcp")) {
1398                 ic_proto_enabled &= ~IC_RARP;
1399                 return 1;
1400         }
1401 #endif
1402 #ifdef CONFIG_IP_PNP_BOOTP
1403         else if (!strcmp(name, "bootp")) {
1404                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1405                 return 1;
1406         }
1407 #endif
1408 #ifdef CONFIG_IP_PNP_RARP
1409         else if (!strcmp(name, "rarp")) {
1410                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1411                 return 1;
1412         }
1413 #endif
1414 #ifdef IPCONFIG_DYNAMIC
1415         else if (!strcmp(name, "both")) {
1416                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1417                 return 1;
1418         }
1419 #endif
1420         return 0;
1421 }
1422
1423 static int __init ip_auto_config_setup(char *addrs)
1424 {
1425         char *cp, *ip, *dp;
1426         int num = 0;
1427
1428         ic_set_manually = 1;
1429
1430         ic_enable = (*addrs &&
1431                 (strcmp(addrs, "off") != 0) &&
1432                 (strcmp(addrs, "none") != 0));
1433         if (!ic_enable)
1434                 return 1;
1435
1436         if (ic_proto_name(addrs))
1437                 return 1;
1438
1439         /* Parse the whole string */
1440         ip = addrs;
1441         while (ip && *ip) {
1442                 if ((cp = strchr(ip, ':')))
1443                         *cp++ = '\0';
1444                 if (strlen(ip) > 0) {
1445                         DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1446                         switch (num) {
1447                         case 0:
1448                                 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY)
1449                                         ic_myaddr = INADDR_NONE;
1450                                 break;
1451                         case 1:
1452                                 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
1453                                         ic_servaddr = INADDR_NONE;
1454                                 break;
1455                         case 2:
1456                                 if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
1457                                         ic_gateway = INADDR_NONE;
1458                                 break;
1459                         case 3:
1460                                 if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
1461                                         ic_netmask = INADDR_NONE;
1462                                 break;
1463                         case 4:
1464                                 if ((dp = strchr(ip, '.'))) {
1465                                         *dp++ = '\0';
1466                                         strlcpy(system_utsname.domainname, dp,
1467                                                 sizeof(system_utsname.domainname));
1468                                 }
1469                                 strlcpy(system_utsname.nodename, ip,
1470                                         sizeof(system_utsname.nodename));
1471                                 ic_host_name_set = 1;
1472                                 break;
1473                         case 5:
1474                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1475                                 break;
1476                         case 6:
1477                                 ic_proto_name(ip);
1478                                 break;
1479                         }
1480                 }
1481                 ip = cp;
1482                 num++;
1483         }
1484
1485         return 1;
1486 }
1487
1488 static int __init nfsaddrs_config_setup(char *addrs)
1489 {
1490         return ip_auto_config_setup(addrs);
1491 }
1492
1493 __setup("ip=", ip_auto_config_setup);
1494 __setup("nfsaddrs=", nfsaddrs_config_setup);