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   1 /*
   2  *  $Id: ipconfig.c,v 1.46 2002/02/01 22:01:04 davem Exp $
   3  *
   4  *  Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
   5  *  user-supplied information to configure own IP address and routes.
   6  *
   7  *  Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
   8  *
   9  *  Derived from network configuration code in fs/nfs/nfsroot.c,
  10  *  originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
  11  *
  12  *  BOOTP rewritten to construct and analyse packets itself instead
  13  *  of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
  14  *                                           -- MJ, December 1998
  15  *
  16  *  Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
  17  *  initialization scheme.
  18  *      - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
  19  *
  20  *  DHCP support added.  To users this looks like a whole separate
  21  *  protocol, but we know it's just a bag on the side of BOOTP.
  22  *              -- Chip Salzenberg <chip@valinux.com>, May 2000
  23  *
  24  *  Ported DHCP support from 2.2.16 to 2.4.0-test4
  25  *              -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
  26  *
  27  *  Merged changes from 2.2.19 into 2.4.3
  28  *              -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
  29  *
  30  *  Multiple Nameservers in /proc/net/pnp
  31  *              --  Josef Siemes <jsiemes@web.de>, Aug 2002
  32  */
  33
  34 #include <linux/types.h>
  35 #include <linux/string.h>
  36 #include <linux/kernel.h>
  37 #include <linux/jiffies.h>
  38 #include <linux/random.h>
  39 #include <linux/init.h>
  40 #include <linux/utsname.h>
  41 #include <linux/in.h>
  42 #include <linux/if.h>
  43 #include <linux/inet.h>
  44 #include <linux/inetdevice.h>
  45 #include <linux/netdevice.h>
  46 #include <linux/if_arp.h>
  47 #include <linux/skbuff.h>
  48 #include <linux/ip.h>
  49 #include <linux/socket.h>
  50 #include <linux/route.h>
  51 #include <linux/udp.h>
  52 #include <linux/proc_fs.h>
  53 #include <linux/seq_file.h>
  54 #include <linux/major.h>
  55 #include <linux/root_dev.h>
  56 #include <linux/delay.h>
  57 #include <linux/nfs_fs.h>
  58 #include <net/net_namespace.h>
  59 #include <net/arp.h>
  60 #include <net/ip.h>
  61 #include <net/ipconfig.h>
  62 #include <net/route.h>
  63
  64 #include <asm/uaccess.h>
  65 #include <net/checksum.h>
  66 #include <asm/processor.h>
  67
  68 /* Define this to allow debugging output */
  69 #undef IPCONFIG_DEBUG
  70
  71 #ifdef IPCONFIG_DEBUG
  72 #define DBG(x) printk x
  73 #else
  74 #define DBG(x) do { } while(0)
  75 #endif
  76
  77 #if defined(CONFIG_IP_PNP_DHCP)
  78 #define IPCONFIG_DHCP
  79 #endif
  80 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
  81 #define IPCONFIG_BOOTP
  82 #endif
  83 #if defined(CONFIG_IP_PNP_RARP)
  84 #define IPCONFIG_RARP
  85 #endif
  86 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
  87 #define IPCONFIG_DYNAMIC
  88 #endif
  89
  90 /* Define the friendly delay before and after opening net devices */
  91 #define CONF_PRE_OPEN           500     /* Before opening: 1/2 second */
  92 #define CONF_POST_OPEN          1       /* After opening: 1 second */
  93
  94 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
  95 #define CONF_OPEN_RETRIES       2       /* (Re)open devices twice */
  96 #define CONF_SEND_RETRIES       6       /* Send six requests per open */
  97 #define CONF_INTER_TIMEOUT      (HZ/2)  /* Inter-device timeout: 1/2 second */
  98 #define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
  99 #define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
 100 #define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
 101 #define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
 102 #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
 103                                            - '3' from resolv.h */
 104
 105 #define NONE __constant_htonl(INADDR_NONE)
 106
 107 /*
 108  * Public IP configuration
 109  */
 110
 111 /* This is used by platforms which might be able to set the ipconfig
 112  * variables using firmware environment vars.  If this is set, it will
 113  * ignore such firmware variables.
 114  */
 115 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
 116
 117 static int ic_enable __initdata = 0;            /* IP config enabled? */
 118
 119 /* Protocol choice */
 120 int ic_proto_enabled __initdata = 0
 121 #ifdef IPCONFIG_BOOTP
 122                         | IC_BOOTP
 123 #endif
 124 #ifdef CONFIG_IP_PNP_DHCP
 125                         | IC_USE_DHCP
 126 #endif
 127 #ifdef IPCONFIG_RARP
 128                         | IC_RARP
 129 #endif
 130                         ;
 131
 132 static int ic_host_name_set __initdata = 0;     /* Host name set by us? */
 133
 134 __be32 ic_myaddr = NONE;                /* My IP address */
 135 static __be32 ic_netmask = NONE;        /* Netmask for local subnet */
 136 __be32 ic_gateway = NONE;       /* Gateway IP address */
 137
 138 __be32 ic_servaddr = NONE;      /* Boot server IP address */
 139
 140 __be32 root_server_addr = NONE; /* Address of NFS server */
 141 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
 142
 143 /* 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(&init_net, 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, arp_hdr_len(dev)))
 463                 goto drop;
 464
 465         /* OK, it is all there and looks valid, process... */
 466         rarp = (struct arphdr *)skb_transport_header(skb);
 467         rarp_ptr = (unsigned char *) (rarp + 1);
 468
 469         /* One reply at a time, please. */
 470         spin_lock(&ic_recv_lock);
 471
 472         /* If we already have a reply, just drop the packet */
 473         if (ic_got_reply)
 474                 goto drop_unlock;
 475
 476         /* Find the ic_device that the packet arrived on */
 477         d = ic_first_dev;
 478         while (d && d->dev != dev)
 479                 d = d->next;
 480         if (!d)
 481                 goto drop_unlock;       /* should never happen */
 482
 483         /* Extract variable-width fields */
 484         sha = rarp_ptr;
 485         rarp_ptr += dev->addr_len;
 486         memcpy(&sip, rarp_ptr, 4);
 487         rarp_ptr += 4;
 488         tha = rarp_ptr;
 489         rarp_ptr += dev->addr_len;
 490         memcpy(&tip, rarp_ptr, 4);
 491
 492         /* Discard packets which are not meant for us. */
 493         if (memcmp(tha, dev->dev_addr, dev->addr_len))
 494                 goto drop_unlock;
 495
 496         /* Discard packets which are not from specified server. */
 497         if (ic_servaddr != NONE && ic_servaddr != sip)
 498                 goto drop_unlock;
 499
 500         /* We have a winner! */
 501         ic_dev = dev;
 502         if (ic_myaddr == NONE)
 503                 ic_myaddr = tip;
 504         ic_servaddr = sip;
 505         ic_got_reply = IC_RARP;
 506
 507 drop_unlock:
 508         /* Show's over.  Nothing to see here.  */
 509         spin_unlock(&ic_recv_lock);
 510
 511 drop:
 512         /* Throw the packet out. */
 513         kfree_skb(skb);
 514         return 0;
 515 }
 516
 517
 518 /*
 519  *  Send RARP request packet over a single interface.
 520  */
 521 static void __init ic_rarp_send_if(struct ic_device *d)
 522 {
 523         struct net_device *dev = d->dev;
 524         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
 525                  dev->dev_addr, dev->dev_addr);
 526 }
 527 #endif
 528
 529 /*
 530  *      DHCP/BOOTP support.
 531  */
 532
 533 #ifdef IPCONFIG_BOOTP
 534
 535 struct bootp_pkt {              /* BOOTP packet format */
 536         struct iphdr iph;       /* IP header */
 537         struct udphdr udph;     /* UDP header */
 538         u8 op;                  /* 1=request, 2=reply */
 539         u8 htype;               /* HW address type */
 540         u8 hlen;                /* HW address length */
 541         u8 hops;                /* Used only by gateways */
 542         __be32 xid;             /* Transaction ID */
 543         __be16 secs;            /* Seconds since we started */
 544         __be16 flags;           /* Just what it says */
 545         __be32 client_ip;               /* Client's IP address if known */
 546         __be32 your_ip;         /* Assigned IP address */
 547         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
 548         __be32 relay_ip;                /* IP address of BOOTP relay */
 549         u8 hw_addr[16];         /* Client's HW address */
 550         u8 serv_name[64];       /* Server host name */
 551         u8 boot_file[128];      /* Name of boot file */
 552         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
 553 };
 554
 555 /* packet ops */
 556 #define BOOTP_REQUEST   1
 557 #define BOOTP_REPLY     2
 558
 559 /* DHCP message types */
 560 #define DHCPDISCOVER    1
 561 #define DHCPOFFER       2
 562 #define DHCPREQUEST     3
 563 #define DHCPDECLINE     4
 564 #define DHCPACK         5
 565 #define DHCPNAK         6
 566 #define DHCPRELEASE     7
 567 #define DHCPINFORM      8
 568
 569 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 570
 571 static struct packet_type bootp_packet_type __initdata = {
 572         .type = __constant_htons(ETH_P_IP),
 573         .func = ic_bootp_recv,
 574 };
 575
 576
 577 /*
 578  *  Initialize DHCP/BOOTP extension fields in the request.
 579  */
 580
 581 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
 582
 583 #ifdef IPCONFIG_DHCP
 584
 585 static void __init
 586 ic_dhcp_init_options(u8 *options)
 587 {
 588         u8 mt = ((ic_servaddr == NONE)
 589                  ? DHCPDISCOVER : DHCPREQUEST);
 590         u8 *e = options;
 591         int len;
 592
 593 #ifdef IPCONFIG_DEBUG
 594         printk("DHCP: Sending message type %d\n", mt);
 595 #endif
 596
 597         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 598         e += 4;
 599
 600         *e++ = 53;              /* DHCP message type */
 601         *e++ = 1;
 602         *e++ = mt;
 603
 604         if (mt == DHCPREQUEST) {
 605                 *e++ = 54;      /* Server ID (IP address) */
 606                 *e++ = 4;
 607                 memcpy(e, &ic_servaddr, 4);
 608                 e += 4;
 609
 610                 *e++ = 50;      /* Requested IP address */
 611                 *e++ = 4;
 612                 memcpy(e, &ic_myaddr, 4);
 613                 e += 4;
 614         }
 615
 616         /* always? */
 617         {
 618                 static const u8 ic_req_params[] = {
 619                         1,      /* Subnet mask */
 620                         3,      /* Default gateway */
 621                         6,      /* DNS server */
 622                         12,     /* Host name */
 623                         15,     /* Domain name */
 624                         17,     /* Boot path */
 625                         40,     /* NIS domain name */
 626                 };
 627
 628                 *e++ = 55;      /* Parameter request list */
 629                 *e++ = sizeof(ic_req_params);
 630                 memcpy(e, ic_req_params, sizeof(ic_req_params));
 631                 e += sizeof(ic_req_params);
 632
 633                 if (*vendor_class_identifier) {
 634                         printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
 635                                vendor_class_identifier);
 636                         *e++ = 60;      /* Class-identifier */
 637                         len = strlen(vendor_class_identifier);
 638                         *e++ = len;
 639                         memcpy(e, vendor_class_identifier, len);
 640                         e += len;
 641                 }
 642         }
 643
 644         *e++ = 255;     /* End of the list */
 645 }
 646
 647 #endif /* IPCONFIG_DHCP */
 648
 649 static void __init ic_bootp_init_ext(u8 *e)
 650 {
 651         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 652         e += 4;
 653         *e++ = 1;               /* Subnet mask request */
 654         *e++ = 4;
 655         e += 4;
 656         *e++ = 3;               /* Default gateway request */
 657         *e++ = 4;
 658         e += 4;
 659         *e++ = 5;               /* Name server request */
 660         *e++ = 8;
 661         e += 8;
 662         *e++ = 12;              /* Host name request */
 663         *e++ = 32;
 664         e += 32;
 665         *e++ = 40;              /* NIS Domain name request */
 666         *e++ = 32;
 667         e += 32;
 668         *e++ = 17;              /* Boot path */
 669         *e++ = 40;
 670         e += 40;
 671
 672         *e++ = 57;              /* set extension buffer size for reply */
 673         *e++ = 2;
 674         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
 675         *e++ = 150;
 676
 677         *e++ = 255;             /* End of the list */
 678 }
 679
 680
 681 /*
 682  *  Initialize the DHCP/BOOTP mechanism.
 683  */
 684 static inline void ic_bootp_init(void)
 685 {
 686         int i;
 687
 688         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
 689                 ic_nameservers[i] = NONE;
 690
 691         dev_add_pack(&bootp_packet_type);
 692 }
 693
 694
 695 /*
 696  *  DHCP/BOOTP cleanup.
 697  */
 698 static inline void ic_bootp_cleanup(void)
 699 {
 700         dev_remove_pack(&bootp_packet_type);
 701 }
 702
 703
 704 /*
 705  *  Send DHCP/BOOTP request to single interface.
 706  */
 707 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
 708 {
 709         struct net_device *dev = d->dev;
 710         struct sk_buff *skb;
 711         struct bootp_pkt *b;
 712         int hh_len = LL_RESERVED_SPACE(dev);
 713         struct iphdr *h;
 714
 715         /* Allocate packet */
 716         skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
 717         if (!skb)
 718                 return;
 719         skb_reserve(skb, hh_len);
 720         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
 721         memset(b, 0, sizeof(struct bootp_pkt));
 722
 723         /* Construct IP header */
 724         skb_reset_network_header(skb);
 725         h = ip_hdr(skb);
 726         h->version = 4;
 727         h->ihl = 5;
 728         h->tot_len = htons(sizeof(struct bootp_pkt));
 729         h->frag_off = htons(IP_DF);
 730         h->ttl = 64;
 731         h->protocol = IPPROTO_UDP;
 732         h->daddr = htonl(INADDR_BROADCAST);
 733         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
 734
 735         /* Construct UDP header */
 736         b->udph.source = htons(68);
 737         b->udph.dest = htons(67);
 738         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
 739         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
 740
 741         /* Construct DHCP/BOOTP header */
 742         b->op = BOOTP_REQUEST;
 743         if (dev->type < 256) /* check for false types */
 744                 b->htype = dev->type;
 745         else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
 746                 b->htype = ARPHRD_IEEE802;
 747         else if (dev->type == ARPHRD_FDDI)
 748                 b->htype = ARPHRD_ETHER;
 749         else {
 750                 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
 751                 b->htype = dev->type; /* can cause undefined behavior */
 752         }
 753
 754         /* server_ip and your_ip address are both already zero per RFC2131 */
 755         b->hlen = dev->addr_len;
 756         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
 757         b->secs = htons(jiffies_diff / HZ);
 758         b->xid = d->xid;
 759
 760         /* add DHCP options or BOOTP extensions */
 761 #ifdef IPCONFIG_DHCP
 762         if (ic_proto_enabled & IC_USE_DHCP)
 763                 ic_dhcp_init_options(b->exten);
 764         else
 765 #endif
 766                 ic_bootp_init_ext(b->exten);
 767
 768         /* Chain packet down the line... */
 769         skb->dev = dev;
 770         skb->protocol = htons(ETH_P_IP);
 771         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
 772                             dev->broadcast, dev->dev_addr, skb->len) < 0 ||
 773             dev_queue_xmit(skb) < 0)
 774                 printk("E");
 775 }
 776
 777
 778 /*
 779  *  Copy BOOTP-supplied string if not already set.
 780  */
 781 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
 782 {
 783         if (!len)
 784                 return 0;
 785         if (len > max-1)
 786                 len = max-1;
 787         memcpy(dest, src, len);
 788         dest[len] = '\0';
 789         return 1;
 790 }
 791
 792
 793 /*
 794  *  Process BOOTP extensions.
 795  */
 796 static void __init ic_do_bootp_ext(u8 *ext)
 797 {
 798        u8 servers;
 799        int i;
 800
 801 #ifdef IPCONFIG_DEBUG
 802         u8 *c;
 803
 804         printk("DHCP/BOOTP: Got extension %d:",*ext);
 805         for (c=ext+2; c<ext+2+ext[1]; c++)
 806                 printk(" %02x", *c);
 807         printk("\n");
 808 #endif
 809
 810         switch (*ext++) {
 811                 case 1:         /* Subnet mask */
 812                         if (ic_netmask == NONE)
 813                                 memcpy(&ic_netmask, ext+1, 4);
 814                         break;
 815                 case 3:         /* Default gateway */
 816                         if (ic_gateway == NONE)
 817                                 memcpy(&ic_gateway, ext+1, 4);
 818                         break;
 819                 case 6:         /* DNS server */
 820                         servers= *ext/4;
 821                         if (servers > CONF_NAMESERVERS_MAX)
 822                                 servers = CONF_NAMESERVERS_MAX;
 823                         for (i = 0; i < servers; i++) {
 824                                 if (ic_nameservers[i] == NONE)
 825                                         memcpy(&ic_nameservers[i], ext+1+4*i, 4);
 826                         }
 827                         break;
 828                 case 12:        /* Host name */
 829                         ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
 830                         ic_host_name_set = 1;
 831                         break;
 832                 case 15:        /* Domain name (DNS) */
 833                         ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
 834                         break;
 835                 case 17:        /* Root path */
 836                         if (!root_server_path[0])
 837                                 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
 838                         break;
 839                 case 40:        /* NIS Domain name (_not_ DNS) */
 840                         ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
 841                         break;
 842         }
 843 }
 844
 845
 846 /*
 847  *  Receive BOOTP reply.
 848  */
 849 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 850 {
 851         struct bootp_pkt *b;
 852         struct iphdr *h;
 853         struct ic_device *d;
 854         int len, ext_len;
 855
 856         if (dev->nd_net != &init_net)
 857                 goto drop;
 858
 859         /* Perform verifications before taking the lock.  */
 860         if (skb->pkt_type == PACKET_OTHERHOST)
 861                 goto drop;
 862
 863         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 864                 return NET_RX_DROP;
 865
 866         if (!pskb_may_pull(skb,
 867                            sizeof(struct iphdr) +
 868                            sizeof(struct udphdr)))
 869                 goto drop;
 870
 871         b = (struct bootp_pkt *)skb_network_header(skb);
 872         h = &b->iph;
 873
 874         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
 875                 goto drop;
 876
 877         /* Fragments are not supported */
 878         if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
 879                 if (net_ratelimit())
 880                         printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
 881                                "reply.\n");
 882                 goto drop;
 883         }
 884
 885         if (skb->len < ntohs(h->tot_len))
 886                 goto drop;
 887
 888         if (ip_fast_csum((char *) h, h->ihl))
 889                 goto drop;
 890
 891         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
 892                 goto drop;
 893
 894         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
 895                 goto drop;
 896
 897         len = ntohs(b->udph.len) - sizeof(struct udphdr);
 898         ext_len = len - (sizeof(*b) -
 899                          sizeof(struct iphdr) -
 900                          sizeof(struct udphdr) -
 901                          sizeof(b->exten));
 902         if (ext_len < 0)
 903                 goto drop;
 904
 905         /* Ok the front looks good, make sure we can get at the rest.  */
 906         if (!pskb_may_pull(skb, skb->len))
 907                 goto drop;
 908
 909         b = (struct bootp_pkt *)skb_network_header(skb);
 910         h = &b->iph;
 911
 912         /* One reply at a time, please. */
 913         spin_lock(&ic_recv_lock);
 914
 915         /* If we already have a reply, just drop the packet */
 916         if (ic_got_reply)
 917                 goto drop_unlock;
 918
 919         /* Find the ic_device that the packet arrived on */
 920         d = ic_first_dev;
 921         while (d && d->dev != dev)
 922                 d = d->next;
 923         if (!d)
 924                 goto drop_unlock;  /* should never happen */
 925
 926         /* Is it a reply to our BOOTP request? */
 927         if (b->op != BOOTP_REPLY ||
 928             b->xid != d->xid) {
 929                 if (net_ratelimit())
 930                         printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
 931                                "op[%x] xid[%x]\n",
 932                                b->op, b->xid);
 933                 goto drop_unlock;
 934         }
 935
 936         /* Parse extensions */
 937         if (ext_len >= 4 &&
 938             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
 939                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
 940                 u8 *ext;
 941
 942 #ifdef IPCONFIG_DHCP
 943                 if (ic_proto_enabled & IC_USE_DHCP) {
 944                         __be32 server_id = NONE;
 945                         int mt = 0;
 946
 947                         ext = &b->exten[4];
 948                         while (ext < end && *ext != 0xff) {
 949                                 u8 *opt = ext++;
 950                                 if (*opt == 0)  /* Padding */
 951                                         continue;
 952                                 ext += *ext + 1;
 953                                 if (ext >= end)
 954                                         break;
 955                                 switch (*opt) {
 956                                 case 53:        /* Message type */
 957                                         if (opt[1])
 958                                                 mt = opt[2];
 959                                         break;
 960                                 case 54:        /* Server ID (IP address) */
 961                                         if (opt[1] >= 4)
 962                                                 memcpy(&server_id, opt + 2, 4);
 963                                         break;
 964                                 }
 965                         }
 966
 967 #ifdef IPCONFIG_DEBUG
 968                         printk("DHCP: Got message type %d\n", mt);
 969 #endif
 970
 971                         switch (mt) {
 972                         case DHCPOFFER:
 973                                 /* While in the process of accepting one offer,
 974                                  * ignore all others.
 975                                  */
 976                                 if (ic_myaddr != NONE)
 977                                         goto drop_unlock;
 978
 979                                 /* Let's accept that offer. */
 980                                 ic_myaddr = b->your_ip;
 981                                 ic_servaddr = server_id;
 982 #ifdef IPCONFIG_DEBUG
 983                                 printk("DHCP: Offered address %u.%u.%u.%u",
 984                                        NIPQUAD(ic_myaddr));
 985                                 printk(" by server %u.%u.%u.%u\n",
 986                                        NIPQUAD(ic_servaddr));
 987 #endif
 988                                 /* The DHCP indicated server address takes
 989                                  * precedence over the bootp header one if
 990                                  * they are different.
 991                                  */
 992                                 if ((server_id != NONE) &&
 993                                     (b->server_ip != server_id))
 994                                         b->server_ip = ic_servaddr;
 995                                 break;
 996
 997                         case DHCPACK:
 998                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
 999                                         goto drop_unlock;
1000
1001                                 /* Yeah! */
1002                                 break;
1003
1004                         default:
1005                                 /* Urque.  Forget it*/
1006                                 ic_myaddr = NONE;
1007                                 ic_servaddr = NONE;
1008                                 goto drop_unlock;
1009                         }
1010
1011                         ic_dhcp_msgtype = mt;
1012
1013                 }
1014 #endif /* IPCONFIG_DHCP */
1015
1016                 ext = &b->exten[4];
1017                 while (ext < end && *ext != 0xff) {
1018                         u8 *opt = ext++;
1019                         if (*opt == 0)  /* Padding */
1020                                 continue;
1021                         ext += *ext + 1;
1022                         if (ext < end)
1023                                 ic_do_bootp_ext(opt);
1024                 }
1025         }
1026
1027         /* We have a winner! */
1028         ic_dev = dev;
1029         ic_myaddr = b->your_ip;
1030         ic_servaddr = b->server_ip;
1031         if (ic_gateway == NONE && b->relay_ip)
1032                 ic_gateway = b->relay_ip;
1033         if (ic_nameservers[0] == NONE)
1034                 ic_nameservers[0] = ic_servaddr;
1035         ic_got_reply = IC_BOOTP;
1036
1037 drop_unlock:
1038         /* Show's over.  Nothing to see here.  */
1039         spin_unlock(&ic_recv_lock);
1040
1041 drop:
1042         /* Throw the packet out. */
1043         kfree_skb(skb);
1044
1045         return 0;
1046 }
1047
1048
1049 #endif
1050
1051
1052 /*
1053  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1054  */
1055
1056 #ifdef IPCONFIG_DYNAMIC
1057
1058 static int __init ic_dynamic(void)
1059 {
1060         int retries;
1061         struct ic_device *d;
1062         unsigned long start_jiffies, timeout, jiff;
1063         int do_bootp = ic_proto_have_if & IC_BOOTP;
1064         int do_rarp = ic_proto_have_if & IC_RARP;
1065
1066         /*
1067          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1068          * This routine gets only called when some pieces of information
1069          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1070          */
1071         if (!ic_proto_enabled) {
1072                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1073                 return -1;
1074         }
1075
1076 #ifdef IPCONFIG_BOOTP
1077         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1078                 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1079 #endif
1080 #ifdef IPCONFIG_RARP
1081         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1082                 printk(KERN_ERR "RARP: No suitable device found.\n");
1083 #endif
1084
1085         if (!ic_proto_have_if)
1086                 /* Error message already printed */
1087                 return -1;
1088
1089         /*
1090          * Setup protocols
1091          */
1092 #ifdef IPCONFIG_BOOTP
1093         if (do_bootp)
1094                 ic_bootp_init();
1095 #endif
1096 #ifdef IPCONFIG_RARP
1097         if (do_rarp)
1098                 ic_rarp_init();
1099 #endif
1100
1101         /*
1102          * Send requests and wait, until we get an answer. This loop
1103          * seems to be a terrible waste of CPU time, but actually there is
1104          * only one process running at all, so we don't need to use any
1105          * scheduler functions.
1106          * [Actually we could now, but the nothing else running note still
1107          *  applies.. - AC]
1108          */
1109         printk(KERN_NOTICE "Sending %s%s%s requests .",
1110                do_bootp
1111                 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1112                (do_bootp && do_rarp) ? " and " : "",
1113                do_rarp ? "RARP" : "");
1114
1115         start_jiffies = jiffies;
1116         d = ic_first_dev;
1117         retries = CONF_SEND_RETRIES;
1118         get_random_bytes(&timeout, sizeof(timeout));
1119         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1120         for (;;) {
1121 #ifdef IPCONFIG_BOOTP
1122                 if (do_bootp && (d->able & IC_BOOTP))
1123                         ic_bootp_send_if(d, jiffies - start_jiffies);
1124 #endif
1125 #ifdef IPCONFIG_RARP
1126                 if (do_rarp && (d->able & IC_RARP))
1127                         ic_rarp_send_if(d);
1128 #endif
1129
1130                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1131                 while (time_before(jiffies, jiff) && !ic_got_reply)
1132                         schedule_timeout_uninterruptible(1);
1133 #ifdef IPCONFIG_DHCP
1134                 /* DHCP isn't done until we get a DHCPACK. */
1135                 if ((ic_got_reply & IC_BOOTP)
1136                     && (ic_proto_enabled & IC_USE_DHCP)
1137                     && ic_dhcp_msgtype != DHCPACK)
1138                 {
1139                         ic_got_reply = 0;
1140                         printk(",");
1141                         continue;
1142                 }
1143 #endif /* IPCONFIG_DHCP */
1144
1145                 if (ic_got_reply) {
1146                         printk(" OK\n");
1147                         break;
1148                 }
1149
1150                 if ((d = d->next))
1151                         continue;
1152
1153                 if (! --retries) {
1154                         printk(" timed out!\n");
1155                         break;
1156                 }
1157
1158                 d = ic_first_dev;
1159
1160                 timeout = timeout CONF_TIMEOUT_MULT;
1161                 if (timeout > CONF_TIMEOUT_MAX)
1162                         timeout = CONF_TIMEOUT_MAX;
1163
1164                 printk(".");
1165         }
1166
1167 #ifdef IPCONFIG_BOOTP
1168         if (do_bootp)
1169                 ic_bootp_cleanup();
1170 #endif
1171 #ifdef IPCONFIG_RARP
1172         if (do_rarp)
1173                 ic_rarp_cleanup();
1174 #endif
1175
1176         if (!ic_got_reply) {
1177                 ic_myaddr = NONE;
1178                 return -1;
1179         }
1180
1181         printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
1182                 ((ic_got_reply & IC_RARP) ? "RARP"
1183                  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1184                 NIPQUAD(ic_servaddr));
1185         printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
1186
1187         return 0;
1188 }
1189
1190 #endif /* IPCONFIG_DYNAMIC */
1191
1192 #ifdef CONFIG_PROC_FS
1193
1194 static int pnp_seq_show(struct seq_file *seq, void *v)
1195 {
1196         int i;
1197
1198         if (ic_proto_used & IC_PROTO)
1199                 seq_printf(seq, "#PROTO: %s\n",
1200                            (ic_proto_used & IC_RARP) ? "RARP"
1201                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1202         else
1203                 seq_puts(seq, "#MANUAL\n");
1204
1205         if (ic_domain[0])
1206                 seq_printf(seq,
1207                            "domain %s\n", ic_domain);
1208         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1209                 if (ic_nameservers[i] != NONE)
1210                         seq_printf(seq,
1211                                    "nameserver %u.%u.%u.%u\n",
1212                                    NIPQUAD(ic_nameservers[i]));
1213         }
1214         if (ic_servaddr != NONE)
1215                 seq_printf(seq,
1216                            "bootserver %u.%u.%u.%u\n",
1217                            NIPQUAD(ic_servaddr));
1218         return 0;
1219 }
1220
1221 static int pnp_seq_open(struct inode *indoe, struct file *file)
1222 {
1223         return single_open(file, pnp_seq_show, NULL);
1224 }
1225
1226 static const struct file_operations pnp_seq_fops = {
1227         .owner          = THIS_MODULE,
1228         .open           = pnp_seq_open,
1229         .read           = seq_read,
1230         .llseek         = seq_lseek,
1231         .release        = single_release,
1232 };
1233 #endif /* CONFIG_PROC_FS */
1234
1235 /*
1236  *  Extract IP address from the parameter string if needed. Note that we
1237  *  need to have root_server_addr set _before_ IPConfig gets called as it
1238  *  can override it.
1239  */
1240 __be32 __init root_nfs_parse_addr(char *name)
1241 {
1242         __be32 addr;
1243         int octets = 0;
1244         char *cp, *cq;
1245
1246         cp = cq = name;
1247         while (octets < 4) {
1248                 while (*cp >= '0' && *cp <= '9')
1249                         cp++;
1250                 if (cp == cq || cp - cq > 3)
1251                         break;
1252                 if (*cp == '.' || octets == 3)
1253                         octets++;
1254                 if (octets < 4)
1255                         cp++;
1256                 cq = cp;
1257         }
1258         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1259                 if (*cp == ':')
1260                         *cp++ = '\0';
1261                 addr = in_aton(name);
1262                 memmove(name, cp, strlen(cp) + 1);
1263         } else
1264                 addr = NONE;
1265
1266         return addr;
1267 }
1268
1269 /*
1270  *      IP Autoconfig dispatcher.
1271  */
1272
1273 static int __init ip_auto_config(void)
1274 {
1275         __be32 addr;
1276
1277 #ifdef CONFIG_PROC_FS
1278         proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1279 #endif /* CONFIG_PROC_FS */
1280
1281         if (!ic_enable)
1282                 return 0;
1283
1284         DBG(("IP-Config: Entered.\n"));
1285 #ifdef IPCONFIG_DYNAMIC
1286  try_try_again:
1287 #endif
1288         /* Give hardware a chance to settle */
1289         msleep(CONF_PRE_OPEN);
1290
1291         /* Setup all network devices */
1292         if (ic_open_devs() < 0)
1293                 return -1;
1294
1295         /* Give drivers a chance to settle */
1296         ssleep(CONF_POST_OPEN);
1297
1298         /*
1299          * If the config information is insufficient (e.g., our IP address or
1300          * IP address of the boot server is missing or we have multiple network
1301          * interfaces and no default was set), use BOOTP or RARP to get the
1302          * missing values.
1303          */
1304         if (ic_myaddr == NONE ||
1305 #ifdef CONFIG_ROOT_NFS
1306             (root_server_addr == NONE
1307              && ic_servaddr == NONE
1308              && ROOT_DEV == Root_NFS) ||
1309 #endif
1310             ic_first_dev->next) {
1311 #ifdef IPCONFIG_DYNAMIC
1312
1313                 int retries = CONF_OPEN_RETRIES;
1314
1315                 if (ic_dynamic() < 0) {
1316                         ic_close_devs();
1317
1318                         /*
1319                          * I don't know why, but sometimes the
1320                          * eepro100 driver (at least) gets upset and
1321                          * doesn't work the first time it's opened.
1322                          * But then if you close it and reopen it, it
1323                          * works just fine.  So we need to try that at
1324                          * least once before giving up.
1325                          *
1326                          * Also, if the root will be NFS-mounted, we
1327                          * have nowhere to go if DHCP fails.  So we
1328                          * just have to keep trying forever.
1329                          *
1330                          *                              -- Chip
1331                          */
1332 #ifdef CONFIG_ROOT_NFS
1333                         if (ROOT_DEV ==  Root_NFS) {
1334                                 printk(KERN_ERR
1335                                         "IP-Config: Retrying forever (NFS root)...\n");
1336                                 goto try_try_again;
1337                         }
1338 #endif
1339
1340                         if (--retries) {
1341                                 printk(KERN_ERR
1342                                        "IP-Config: Reopening network devices...\n");
1343                                 goto try_try_again;
1344                         }
1345
1346                         /* Oh, well.  At least we tried. */
1347                         printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1348                         return -1;
1349                 }
1350 #else /* !DYNAMIC */
1351                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1352                 ic_close_devs();
1353                 return -1;
1354 #endif /* IPCONFIG_DYNAMIC */
1355         } else {
1356                 /* Device selected manually or only one device -> use it */
1357                 ic_dev = ic_first_dev->dev;
1358         }
1359
1360         addr = root_nfs_parse_addr(root_server_path);
1361         if (root_server_addr == NONE)
1362                 root_server_addr = addr;
1363
1364         /*
1365          * Use defaults whereever applicable.
1366          */
1367         if (ic_defaults() < 0)
1368                 return -1;
1369
1370         /*
1371          * Close all network devices except the device we've
1372          * autoconfigured and set up routes.
1373          */
1374         ic_close_devs();
1375         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1376                 return -1;
1377
1378         /*
1379          * Record which protocol was actually used.
1380          */
1381 #ifdef IPCONFIG_DYNAMIC
1382         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1383 #endif
1384
1385 #ifndef IPCONFIG_SILENT
1386         /*
1387          * Clue in the operator.
1388          */
1389         printk("IP-Config: Complete:");
1390         printk("\n     device=%s", ic_dev->name);
1391         printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
1392         printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
1393         printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
1394         printk(",\n     host=%s, domain=%s, nis-domain=%s",
1395                utsname()->nodename, ic_domain, utsname()->domainname);
1396         printk(",\n     bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
1397         printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
1398         printk(", rootpath=%s", root_server_path);
1399         printk("\n");
1400 #endif /* !SILENT */
1401
1402         return 0;
1403 }
1404
1405 late_initcall(ip_auto_config);
1406
1407
1408 /*
1409  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1410  *  command line parameter.  See Documentation/nfsroot.txt.
1411  */
1412 static int __init ic_proto_name(char *name)
1413 {
1414         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1415                 return 1;
1416         }
1417         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1418                 return 0;
1419         }
1420 #ifdef CONFIG_IP_PNP_DHCP
1421         else if (!strcmp(name, "dhcp")) {
1422                 ic_proto_enabled &= ~IC_RARP;
1423                 return 1;
1424         }
1425 #endif
1426 #ifdef CONFIG_IP_PNP_BOOTP
1427         else if (!strcmp(name, "bootp")) {
1428                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1429                 return 1;
1430         }
1431 #endif
1432 #ifdef CONFIG_IP_PNP_RARP
1433         else if (!strcmp(name, "rarp")) {
1434                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1435                 return 1;
1436         }
1437 #endif
1438 #ifdef IPCONFIG_DYNAMIC
1439         else if (!strcmp(name, "both")) {
1440                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1441                 return 1;
1442         }
1443 #endif
1444         return 0;
1445 }
1446
1447 static int __init ip_auto_config_setup(char *addrs)
1448 {
1449         char *cp, *ip, *dp;
1450         int num = 0;
1451
1452         ic_set_manually = 1;
1453         ic_enable = 1;
1454
1455         /*
1456          * If any dhcp, bootp etc options are set, leave autoconfig on
1457          * and skip the below static IP processing.
1458          */
1459         if (ic_proto_name(addrs))
1460                 return 1;
1461
1462         /* If no static IP is given, turn off autoconfig and bail.  */
1463         if (*addrs == 0 ||
1464             strcmp(addrs, "off") == 0 ||
1465             strcmp(addrs, "none") == 0) {
1466                 ic_enable = 0;
1467                 return 1;
1468         }
1469
1470         /* Parse string for static IP assignment.  */
1471         ip = addrs;
1472         while (ip && *ip) {
1473                 if ((cp = strchr(ip, ':')))
1474                         *cp++ = '\0';
1475                 if (strlen(ip) > 0) {
1476                         DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1477                         switch (num) {
1478                         case 0:
1479                                 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY)
1480                                         ic_myaddr = NONE;
1481                                 break;
1482                         case 1:
1483                                 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
1484                                         ic_servaddr = NONE;
1485                                 break;
1486                         case 2:
1487                                 if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
1488                                         ic_gateway = NONE;
1489                                 break;
1490                         case 3:
1491                                 if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
1492                                         ic_netmask = NONE;
1493                                 break;
1494                         case 4:
1495                                 if ((dp = strchr(ip, '.'))) {
1496                                         *dp++ = '\0';
1497                                         strlcpy(utsname()->domainname, dp,
1498                                                 sizeof(utsname()->domainname));
1499                                 }
1500                                 strlcpy(utsname()->nodename, ip,
1501                                         sizeof(utsname()->nodename));
1502                                 ic_host_name_set = 1;
1503                                 break;
1504                         case 5:
1505                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1506                                 break;
1507                         case 6:
1508                                 if (ic_proto_name(ip) == 0 &&
1509                                     ic_myaddr == NONE) {
1510                                         ic_enable = 0;
1511                                 }
1512                                 break;
1513                         }
1514                 }
1515                 ip = cp;
1516                 num++;
1517         }
1518
1519         return 1;
1520 }
1521
1522 static int __init nfsaddrs_config_setup(char *addrs)
1523 {
1524         return ip_auto_config_setup(addrs);
1525 }
1526
1527 static int __init vendor_class_identifier_setup(char *addrs)
1528 {
1529         if (strlcpy(vendor_class_identifier, addrs,
1530                     sizeof(vendor_class_identifier))
1531             >= sizeof(vendor_class_identifier))
1532                 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1533                        vendor_class_identifier);
1534         return 1;
1535 }
1536
1537 __setup("ip=", ip_auto_config_setup);
1538 __setup("nfsaddrs=", nfsaddrs_config_setup);
1539 __setup("dhcpclass=", vendor_class_identifier_setup);