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

   1 /*
   2  *  Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
   3  *  user-supplied information to configure own IP address and routes.
   4  *
   5  *  Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
   6  *
   7  *  Derived from network configuration code in fs/nfs/nfsroot.c,
   8  *  originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
   9  *
  10  *  BOOTP rewritten to construct and analyse packets itself instead
  11  *  of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
  12  *                                           -- MJ, December 1998
  13  *
  14  *  Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
  15  *  initialization scheme.
  16  *      - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
  17  *
  18  *  DHCP support added.  To users this looks like a whole separate
  19  *  protocol, but we know it's just a bag on the side of BOOTP.
  20  *              -- Chip Salzenberg <chip@valinux.com>, May 2000
  21  *
  22  *  Ported DHCP support from 2.2.16 to 2.4.0-test4
  23  *              -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
  24  *
  25  *  Merged changes from 2.2.19 into 2.4.3
  26  *              -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
  27  *
  28  *  Multiple Nameservers in /proc/net/pnp
  29  *              --  Josef Siemes <jsiemes@web.de>, Aug 2002
  30  */
  31
  32 #include <linux/types.h>
  33 #include <linux/string.h>
  34 #include <linux/kernel.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/random.h>
  37 #include <linux/init.h>
  38 #include <linux/utsname.h>
  39 #include <linux/in.h>
  40 #include <linux/if.h>
  41 #include <linux/inet.h>
  42 #include <linux/inetdevice.h>
  43 #include <linux/netdevice.h>
  44 #include <linux/if_arp.h>
  45 #include <linux/skbuff.h>
  46 #include <linux/ip.h>
  47 #include <linux/socket.h>
  48 #include <linux/route.h>
  49 #include <linux/udp.h>
  50 #include <linux/proc_fs.h>
  51 #include <linux/seq_file.h>
  52 #include <linux/major.h>
  53 #include <linux/root_dev.h>
  54 #include <linux/delay.h>
  55 #include <linux/nfs_fs.h>
  56 #include <net/net_namespace.h>
  57 #include <net/arp.h>
  58 #include <net/ip.h>
  59 #include <net/ipconfig.h>
  60 #include <net/route.h>
  61
  62 #include <asm/uaccess.h>
  63 #include <net/checksum.h>
  64 #include <asm/processor.h>
  65
  66 /* Define this to allow debugging output */
  67 #undef IPCONFIG_DEBUG
  68
  69 #ifdef IPCONFIG_DEBUG
  70 #define DBG(x) printk x
  71 #else
  72 #define DBG(x) do { } while(0)
  73 #endif
  74
  75 #if defined(CONFIG_IP_PNP_DHCP)
  76 #define IPCONFIG_DHCP
  77 #endif
  78 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
  79 #define IPCONFIG_BOOTP
  80 #endif
  81 #if defined(CONFIG_IP_PNP_RARP)
  82 #define IPCONFIG_RARP
  83 #endif
  84 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
  85 #define IPCONFIG_DYNAMIC
  86 #endif
  87
  88 /* Define the friendly delay before and after opening net devices */
  89 #define CONF_PRE_OPEN           500     /* Before opening: 1/2 second */
  90 #define CONF_POST_OPEN          1       /* After opening: 1 second */
  91
  92 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
  93 #define CONF_OPEN_RETRIES       2       /* (Re)open devices twice */
  94 #define CONF_SEND_RETRIES       6       /* Send six requests per open */
  95 #define CONF_INTER_TIMEOUT      (HZ/2)  /* Inter-device timeout: 1/2 second */
  96 #define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
  97 #define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
  98 #define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
  99 #define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
 100 #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
 101                                            - '3' from resolv.h */
 102
 103 #define NONE cpu_to_be32(INADDR_NONE)
 104 #define ANY cpu_to_be32(INADDR_ANY)
 105
 106 /*
 107  * Public IP configuration
 108  */
 109
 110 /* This is used by platforms which might be able to set the ipconfig
 111  * variables using firmware environment vars.  If this is set, it will
 112  * ignore such firmware variables.
 113  */
 114 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
 115
 116 static int ic_enable __initdata = 0;            /* IP config enabled? */
 117
 118 /* Protocol choice */
 119 int ic_proto_enabled __initdata = 0
 120 #ifdef IPCONFIG_BOOTP
 121                         | IC_BOOTP
 122 #endif
 123 #ifdef CONFIG_IP_PNP_DHCP
 124                         | IC_USE_DHCP
 125 #endif
 126 #ifdef IPCONFIG_RARP
 127                         | IC_RARP
 128 #endif
 129                         ;
 130
 131 static int ic_host_name_set __initdata = 0;     /* Host name set by us? */
 132
 133 __be32 ic_myaddr = NONE;                /* My IP address */
 134 static __be32 ic_netmask = NONE;        /* Netmask for local subnet */
 135 __be32 ic_gateway = NONE;       /* Gateway IP address */
 136
 137 __be32 ic_servaddr = NONE;      /* Boot server IP address */
 138
 139 __be32 root_server_addr = NONE; /* Address of NFS server */
 140 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
 141
 142 u32 ic_dev_xid;         /* Device under configuration */
 143
 144 /* vendor class identifier */
 145 static char vendor_class_identifier[253] __initdata;
 146
 147 /* Persistent data: */
 148
 149 static int ic_proto_used;                       /* Protocol used, if any */
 150 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
 151 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
 152
 153 /*
 154  * Private state.
 155  */
 156
 157 /* Name of user-selected boot device */
 158 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
 159
 160 /* Protocols supported by available interfaces */
 161 static int ic_proto_have_if __initdata = 0;
 162
 163 #ifdef IPCONFIG_DYNAMIC
 164 static DEFINE_SPINLOCK(ic_recv_lock);
 165 static volatile int ic_got_reply __initdata = 0;    /* Proto(s) that replied */
 166 #endif
 167 #ifdef IPCONFIG_DHCP
 168 static int ic_dhcp_msgtype __initdata = 0;      /* DHCP msg type received */
 169 #endif
 170
 171
 172 /*
 173  *      Network devices
 174  */
 175
 176 struct ic_device {
 177         struct ic_device *next;
 178         struct net_device *dev;
 179         unsigned short flags;
 180         short able;
 181         __be32 xid;
 182 };
 183
 184 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
 185 static struct net_device *ic_dev __initdata = NULL;     /* Selected device */
 186
 187 static int __init ic_open_devs(void)
 188 {
 189         struct ic_device *d, **last;
 190         struct net_device *dev;
 191         unsigned short oflags;
 192
 193         last = &ic_first_dev;
 194         rtnl_lock();
 195
 196         /* bring loopback device up first */
 197         for_each_netdev(&init_net, dev) {
 198                 if (!(dev->flags & IFF_LOOPBACK))
 199                         continue;
 200                 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
 201                         printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
 202         }
 203
 204         for_each_netdev(&init_net, dev) {
 205                 if (dev->flags & IFF_LOOPBACK)
 206                         continue;
 207                 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
 208                     (!(dev->flags & IFF_LOOPBACK) &&
 209                      (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
 210                      strncmp(dev->name, "dummy", 5))) {
 211                         int able = 0;
 212                         if (dev->mtu >= 364)
 213                                 able |= IC_BOOTP;
 214                         else
 215                                 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
 216                         if (!(dev->flags & IFF_NOARP))
 217                                 able |= IC_RARP;
 218                         able &= ic_proto_enabled;
 219                         if (ic_proto_enabled && !able)
 220                                 continue;
 221                         oflags = dev->flags;
 222                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
 223                                 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
 224                                 continue;
 225                         }
 226                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
 227                                 rtnl_unlock();
 228                                 return -1;
 229                         }
 230                         d->dev = dev;
 231                         *last = d;
 232                         last = &d->next;
 233                         d->flags = oflags;
 234                         d->able = able;
 235                         if (able & IC_BOOTP)
 236                                 get_random_bytes(&d->xid, sizeof(__be32));
 237                         else
 238                                 d->xid = 0;
 239                         ic_proto_have_if |= able;
 240                         DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
 241                                 dev->name, able, d->xid));
 242                 }
 243         }
 244         rtnl_unlock();
 245
 246         *last = NULL;
 247
 248         if (!ic_first_dev) {
 249                 if (user_dev_name[0])
 250                         printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
 251                 else
 252                         printk(KERN_ERR "IP-Config: No network devices available.\n");
 253                 return -1;
 254         }
 255         return 0;
 256 }
 257
 258 static void __init ic_close_devs(void)
 259 {
 260         struct ic_device *d, *next;
 261         struct net_device *dev;
 262
 263         rtnl_lock();
 264         next = ic_first_dev;
 265         while ((d = next)) {
 266                 next = d->next;
 267                 dev = d->dev;
 268                 if (dev != ic_dev) {
 269                         DBG(("IP-Config: Downing %s\n", dev->name));
 270                         dev_change_flags(dev, d->flags);
 271                 }
 272                 kfree(d);
 273         }
 274         rtnl_unlock();
 275 }
 276
 277 /*
 278  *      Interface to various network functions.
 279  */
 280
 281 static inline void
 282 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
 283 {
 284         sin->sin_family = AF_INET;
 285         sin->sin_addr.s_addr = addr;
 286         sin->sin_port = port;
 287 }
 288
 289 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
 290 {
 291         int res;
 292
 293         mm_segment_t oldfs = get_fs();
 294         set_fs(get_ds());
 295         res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
 296         set_fs(oldfs);
 297         return res;
 298 }
 299
 300 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
 301 {
 302         int res;
 303
 304         mm_segment_t oldfs = get_fs();
 305         set_fs(get_ds());
 306         res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
 307         set_fs(oldfs);
 308         return res;
 309 }
 310
 311 /*
 312  *      Set up interface addresses and routes.
 313  */
 314
 315 static int __init ic_setup_if(void)
 316 {
 317         struct ifreq ir;
 318         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
 319         int err;
 320
 321         memset(&ir, 0, sizeof(ir));
 322         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
 323         set_sockaddr(sin, ic_myaddr, 0);
 324         if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
 325                 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
 326                 return -1;
 327         }
 328         set_sockaddr(sin, ic_netmask, 0);
 329         if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
 330                 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
 331                 return -1;
 332         }
 333         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
 334         if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
 335                 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
 336                 return -1;
 337         }
 338         return 0;
 339 }
 340
 341 static int __init ic_setup_routes(void)
 342 {
 343         /* No need to setup device routes, only the default route... */
 344
 345         if (ic_gateway != NONE) {
 346                 struct rtentry rm;
 347                 int err;
 348
 349                 memset(&rm, 0, sizeof(rm));
 350                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
 351                         printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
 352                         return -1;
 353                 }
 354                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
 355                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
 356                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
 357                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
 358                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
 359                         printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
 360                         return -1;
 361                 }
 362         }
 363
 364         return 0;
 365 }
 366
 367 /*
 368  *      Fill in default values for all missing parameters.
 369  */
 370
 371 static int __init ic_defaults(void)
 372 {
 373         /*
 374          *      At this point we have no userspace running so need not
 375          *      claim locks on system_utsname
 376          */
 377
 378         if (!ic_host_name_set)
 379                 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
 380
 381         if (root_server_addr == NONE)
 382                 root_server_addr = ic_servaddr;
 383
 384         if (ic_netmask == NONE) {
 385                 if (IN_CLASSA(ntohl(ic_myaddr)))
 386                         ic_netmask = htonl(IN_CLASSA_NET);
 387                 else if (IN_CLASSB(ntohl(ic_myaddr)))
 388                         ic_netmask = htonl(IN_CLASSB_NET);
 389                 else if (IN_CLASSC(ntohl(ic_myaddr)))
 390                         ic_netmask = htonl(IN_CLASSC_NET);
 391                 else {
 392                         printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n",
 393                                 &ic_myaddr);
 394                         return -1;
 395                 }
 396                 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
 397         }
 398
 399         return 0;
 400 }
 401
 402 /*
 403  *      RARP support.
 404  */
 405
 406 #ifdef IPCONFIG_RARP
 407
 408 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 409
 410 static struct packet_type rarp_packet_type __initdata = {
 411         .type = cpu_to_be16(ETH_P_RARP),
 412         .func = ic_rarp_recv,
 413 };
 414
 415 static inline void __init ic_rarp_init(void)
 416 {
 417         dev_add_pack(&rarp_packet_type);
 418 }
 419
 420 static inline void __init ic_rarp_cleanup(void)
 421 {
 422         dev_remove_pack(&rarp_packet_type);
 423 }
 424
 425 /*
 426  *  Process received RARP packet.
 427  */
 428 static int __init
 429 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 430 {
 431         struct arphdr *rarp;
 432         unsigned char *rarp_ptr;
 433         __be32 sip, tip;
 434         unsigned char *sha, *tha;               /* s for "source", t for "target" */
 435         struct ic_device *d;
 436
 437         if (!net_eq(dev_net(dev), &init_net))
 438                 goto drop;
 439
 440         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 441                 return NET_RX_DROP;
 442
 443         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
 444                 goto drop;
 445
 446         /* Basic sanity checks can be done without the lock.  */
 447         rarp = (struct arphdr *)skb_transport_header(skb);
 448
 449         /* If this test doesn't pass, it's not IP, or we should
 450          * ignore it anyway.
 451          */
 452         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
 453                 goto drop;
 454
 455         /* If it's not a RARP reply, delete it. */
 456         if (rarp->ar_op != htons(ARPOP_RREPLY))
 457                 goto drop;
 458
 459         /* If it's not Ethernet, delete it. */
 460         if (rarp->ar_pro != htons(ETH_P_IP))
 461                 goto drop;
 462
 463         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
 464                 goto drop;
 465
 466         /* OK, it is all there and looks valid, process... */
 467         rarp = (struct arphdr *)skb_transport_header(skb);
 468         rarp_ptr = (unsigned char *) (rarp + 1);
 469
 470         /* One reply at a time, please. */
 471         spin_lock(&ic_recv_lock);
 472
 473         /* If we already have a reply, just drop the packet */
 474         if (ic_got_reply)
 475                 goto drop_unlock;
 476
 477         /* Find the ic_device that the packet arrived on */
 478         d = ic_first_dev;
 479         while (d && d->dev != dev)
 480                 d = d->next;
 481         if (!d)
 482                 goto drop_unlock;       /* should never happen */
 483
 484         /* Extract variable-width fields */
 485         sha = rarp_ptr;
 486         rarp_ptr += dev->addr_len;
 487         memcpy(&sip, rarp_ptr, 4);
 488         rarp_ptr += 4;
 489         tha = rarp_ptr;
 490         rarp_ptr += dev->addr_len;
 491         memcpy(&tip, rarp_ptr, 4);
 492
 493         /* Discard packets which are not meant for us. */
 494         if (memcmp(tha, dev->dev_addr, dev->addr_len))
 495                 goto drop_unlock;
 496
 497         /* Discard packets which are not from specified server. */
 498         if (ic_servaddr != NONE && ic_servaddr != sip)
 499                 goto drop_unlock;
 500
 501         /* We have a winner! */
 502         ic_dev = dev;
 503         if (ic_myaddr == NONE)
 504                 ic_myaddr = tip;
 505         ic_servaddr = sip;
 506         ic_got_reply = IC_RARP;
 507
 508 drop_unlock:
 509         /* Show's over.  Nothing to see here.  */
 510         spin_unlock(&ic_recv_lock);
 511
 512 drop:
 513         /* Throw the packet out. */
 514         kfree_skb(skb);
 515         return 0;
 516 }
 517
 518
 519 /*
 520  *  Send RARP request packet over a single interface.
 521  */
 522 static void __init ic_rarp_send_if(struct ic_device *d)
 523 {
 524         struct net_device *dev = d->dev;
 525         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
 526                  dev->dev_addr, dev->dev_addr);
 527 }
 528 #endif
 529
 530 /*
 531  *      DHCP/BOOTP support.
 532  */
 533
 534 #ifdef IPCONFIG_BOOTP
 535
 536 struct bootp_pkt {              /* BOOTP packet format */
 537         struct iphdr iph;       /* IP header */
 538         struct udphdr udph;     /* UDP header */
 539         u8 op;                  /* 1=request, 2=reply */
 540         u8 htype;               /* HW address type */
 541         u8 hlen;                /* HW address length */
 542         u8 hops;                /* Used only by gateways */
 543         __be32 xid;             /* Transaction ID */
 544         __be16 secs;            /* Seconds since we started */
 545         __be16 flags;           /* Just what it says */
 546         __be32 client_ip;               /* Client's IP address if known */
 547         __be32 your_ip;         /* Assigned IP address */
 548         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
 549         __be32 relay_ip;                /* IP address of BOOTP relay */
 550         u8 hw_addr[16];         /* Client's HW address */
 551         u8 serv_name[64];       /* Server host name */
 552         u8 boot_file[128];      /* Name of boot file */
 553         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
 554 };
 555
 556 /* packet ops */
 557 #define BOOTP_REQUEST   1
 558 #define BOOTP_REPLY     2
 559
 560 /* DHCP message types */
 561 #define DHCPDISCOVER    1
 562 #define DHCPOFFER       2
 563 #define DHCPREQUEST     3
 564 #define DHCPDECLINE     4
 565 #define DHCPACK         5
 566 #define DHCPNAK         6
 567 #define DHCPRELEASE     7
 568 #define DHCPINFORM      8
 569
 570 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 571
 572 static struct packet_type bootp_packet_type __initdata = {
 573         .type = cpu_to_be16(ETH_P_IP),
 574         .func = ic_bootp_recv,
 575 };
 576
 577
 578 /*
 579  *  Initialize DHCP/BOOTP extension fields in the request.
 580  */
 581
 582 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
 583
 584 #ifdef IPCONFIG_DHCP
 585
 586 static void __init
 587 ic_dhcp_init_options(u8 *options)
 588 {
 589         u8 mt = ((ic_servaddr == NONE)
 590                  ? DHCPDISCOVER : DHCPREQUEST);
 591         u8 *e = options;
 592         int len;
 593
 594 #ifdef IPCONFIG_DEBUG
 595         printk("DHCP: Sending message type %d\n", mt);
 596 #endif
 597
 598         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 599         e += 4;
 600
 601         *e++ = 53;              /* DHCP message type */
 602         *e++ = 1;
 603         *e++ = mt;
 604
 605         if (mt == DHCPREQUEST) {
 606                 *e++ = 54;      /* Server ID (IP address) */
 607                 *e++ = 4;
 608                 memcpy(e, &ic_servaddr, 4);
 609                 e += 4;
 610
 611                 *e++ = 50;      /* Requested IP address */
 612                 *e++ = 4;
 613                 memcpy(e, &ic_myaddr, 4);
 614                 e += 4;
 615         }
 616
 617         /* always? */
 618         {
 619                 static const u8 ic_req_params[] = {
 620                         1,      /* Subnet mask */
 621                         3,      /* Default gateway */
 622                         6,      /* DNS server */
 623                         12,     /* Host name */
 624                         15,     /* Domain name */
 625                         17,     /* Boot path */
 626                         40,     /* NIS domain name */
 627                 };
 628
 629                 *e++ = 55;      /* Parameter request list */
 630                 *e++ = sizeof(ic_req_params);
 631                 memcpy(e, ic_req_params, sizeof(ic_req_params));
 632                 e += sizeof(ic_req_params);
 633
 634                 if (*vendor_class_identifier) {
 635                         printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
 636                                vendor_class_identifier);
 637                         *e++ = 60;      /* Class-identifier */
 638                         len = strlen(vendor_class_identifier);
 639                         *e++ = len;
 640                         memcpy(e, vendor_class_identifier, len);
 641                         e += len;
 642                 }
 643         }
 644
 645         *e++ = 255;     /* End of the list */
 646 }
 647
 648 #endif /* IPCONFIG_DHCP */
 649
 650 static void __init ic_bootp_init_ext(u8 *e)
 651 {
 652         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 653         e += 4;
 654         *e++ = 1;               /* Subnet mask request */
 655         *e++ = 4;
 656         e += 4;
 657         *e++ = 3;               /* Default gateway request */
 658         *e++ = 4;
 659         e += 4;
 660         *e++ = 5;               /* Name server request */
 661         *e++ = 8;
 662         e += 8;
 663         *e++ = 12;              /* Host name request */
 664         *e++ = 32;
 665         e += 32;
 666         *e++ = 40;              /* NIS Domain name request */
 667         *e++ = 32;
 668         e += 32;
 669         *e++ = 17;              /* Boot path */
 670         *e++ = 40;
 671         e += 40;
 672
 673         *e++ = 57;              /* set extension buffer size for reply */
 674         *e++ = 2;
 675         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
 676         *e++ = 150;
 677
 678         *e++ = 255;             /* End of the list */
 679 }
 680
 681
 682 /*
 683  *  Initialize the DHCP/BOOTP mechanism.
 684  */
 685 static inline void __init ic_bootp_init(void)
 686 {
 687         int i;
 688
 689         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
 690                 ic_nameservers[i] = NONE;
 691
 692         dev_add_pack(&bootp_packet_type);
 693 }
 694
 695
 696 /*
 697  *  DHCP/BOOTP cleanup.
 698  */
 699 static inline void __init ic_bootp_cleanup(void)
 700 {
 701         dev_remove_pack(&bootp_packet_type);
 702 }
 703
 704
 705 /*
 706  *  Send DHCP/BOOTP request to single interface.
 707  */
 708 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
 709 {
 710         struct net_device *dev = d->dev;
 711         struct sk_buff *skb;
 712         struct bootp_pkt *b;
 713         struct iphdr *h;
 714
 715         /* Allocate packet */
 716         skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15,
 717                         GFP_KERNEL);
 718         if (!skb)
 719                 return;
 720         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 721         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
 722         memset(b, 0, sizeof(struct bootp_pkt));
 723
 724         /* Construct IP header */
 725         skb_reset_network_header(skb);
 726         h = ip_hdr(skb);
 727         h->version = 4;
 728         h->ihl = 5;
 729         h->tot_len = htons(sizeof(struct bootp_pkt));
 730         h->frag_off = htons(IP_DF);
 731         h->ttl = 64;
 732         h->protocol = IPPROTO_UDP;
 733         h->daddr = htonl(INADDR_BROADCAST);
 734         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
 735
 736         /* Construct UDP header */
 737         b->udph.source = htons(68);
 738         b->udph.dest = htons(67);
 739         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
 740         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
 741
 742         /* Construct DHCP/BOOTP header */
 743         b->op = BOOTP_REQUEST;
 744         if (dev->type < 256) /* check for false types */
 745                 b->htype = dev->type;
 746         else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
 747                 b->htype = ARPHRD_IEEE802;
 748         else if (dev->type == ARPHRD_FDDI)
 749                 b->htype = ARPHRD_ETHER;
 750         else {
 751                 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
 752                 b->htype = dev->type; /* can cause undefined behavior */
 753         }
 754
 755         /* server_ip and your_ip address are both already zero per RFC2131 */
 756         b->hlen = dev->addr_len;
 757         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
 758         b->secs = htons(jiffies_diff / HZ);
 759         b->xid = d->xid;
 760
 761         /* add DHCP options or BOOTP extensions */
 762 #ifdef IPCONFIG_DHCP
 763         if (ic_proto_enabled & IC_USE_DHCP)
 764                 ic_dhcp_init_options(b->exten);
 765         else
 766 #endif
 767                 ic_bootp_init_ext(b->exten);
 768
 769         /* Chain packet down the line... */
 770         skb->dev = dev;
 771         skb->protocol = htons(ETH_P_IP);
 772         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
 773                             dev->broadcast, dev->dev_addr, skb->len) < 0 ||
 774             dev_queue_xmit(skb) < 0)
 775                 printk("E");
 776 }
 777
 778
 779 /*
 780  *  Copy BOOTP-supplied string if not already set.
 781  */
 782 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
 783 {
 784         if (!len)
 785                 return 0;
 786         if (len > max-1)
 787                 len = max-1;
 788         memcpy(dest, src, len);
 789         dest[len] = '\0';
 790         return 1;
 791 }
 792
 793
 794 /*
 795  *  Process BOOTP extensions.
 796  */
 797 static void __init ic_do_bootp_ext(u8 *ext)
 798 {
 799        u8 servers;
 800        int i;
 801
 802 #ifdef IPCONFIG_DEBUG
 803         u8 *c;
 804
 805         printk("DHCP/BOOTP: Got extension %d:",*ext);
 806         for (c=ext+2; c<ext+2+ext[1]; c++)
 807                 printk(" %02x", *c);
 808         printk("\n");
 809 #endif
 810
 811         switch (*ext++) {
 812                 case 1:         /* Subnet mask */
 813                         if (ic_netmask == NONE)
 814                                 memcpy(&ic_netmask, ext+1, 4);
 815                         break;
 816                 case 3:         /* Default gateway */
 817                         if (ic_gateway == NONE)
 818                                 memcpy(&ic_gateway, ext+1, 4);
 819                         break;
 820                 case 6:         /* DNS server */
 821                         servers= *ext/4;
 822                         if (servers > CONF_NAMESERVERS_MAX)
 823                                 servers = CONF_NAMESERVERS_MAX;
 824                         for (i = 0; i < servers; i++) {
 825                                 if (ic_nameservers[i] == NONE)
 826                                         memcpy(&ic_nameservers[i], ext+1+4*i, 4);
 827                         }
 828                         break;
 829                 case 12:        /* Host name */
 830                         ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
 831                         ic_host_name_set = 1;
 832                         break;
 833                 case 15:        /* Domain name (DNS) */
 834                         ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
 835                         break;
 836                 case 17:        /* Root path */
 837                         if (!root_server_path[0])
 838                                 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
 839                         break;
 840                 case 40:        /* NIS Domain name (_not_ DNS) */
 841                         ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
 842                         break;
 843         }
 844 }
 845
 846
 847 /*
 848  *  Receive BOOTP reply.
 849  */
 850 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 851 {
 852         struct bootp_pkt *b;
 853         struct iphdr *h;
 854         struct ic_device *d;
 855         int len, ext_len;
 856
 857         if (!net_eq(dev_net(dev), &init_net))
 858                 goto drop;
 859
 860         /* Perform verifications before taking the lock.  */
 861         if (skb->pkt_type == PACKET_OTHERHOST)
 862                 goto drop;
 863
 864         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 865                 return NET_RX_DROP;
 866
 867         if (!pskb_may_pull(skb,
 868                            sizeof(struct iphdr) +
 869                            sizeof(struct udphdr)))
 870                 goto drop;
 871
 872         b = (struct bootp_pkt *)skb_network_header(skb);
 873         h = &b->iph;
 874
 875         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
 876                 goto drop;
 877
 878         /* Fragments are not supported */
 879         if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
 880                 if (net_ratelimit())
 881                         printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
 882                                "reply.\n");
 883                 goto drop;
 884         }
 885
 886         if (skb->len < ntohs(h->tot_len))
 887                 goto drop;
 888
 889         if (ip_fast_csum((char *) h, h->ihl))
 890                 goto drop;
 891
 892         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
 893                 goto drop;
 894
 895         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
 896                 goto drop;
 897
 898         len = ntohs(b->udph.len) - sizeof(struct udphdr);
 899         ext_len = len - (sizeof(*b) -
 900                          sizeof(struct iphdr) -
 901                          sizeof(struct udphdr) -
 902                          sizeof(b->exten));
 903         if (ext_len < 0)
 904                 goto drop;
 905
 906         /* Ok the front looks good, make sure we can get at the rest.  */
 907         if (!pskb_may_pull(skb, skb->len))
 908                 goto drop;
 909
 910         b = (struct bootp_pkt *)skb_network_header(skb);
 911         h = &b->iph;
 912
 913         /* One reply at a time, please. */
 914         spin_lock(&ic_recv_lock);
 915
 916         /* If we already have a reply, just drop the packet */
 917         if (ic_got_reply)
 918                 goto drop_unlock;
 919
 920         /* Find the ic_device that the packet arrived on */
 921         d = ic_first_dev;
 922         while (d && d->dev != dev)
 923                 d = d->next;
 924         if (!d)
 925                 goto drop_unlock;  /* should never happen */
 926
 927         /* Is it a reply to our BOOTP request? */
 928         if (b->op != BOOTP_REPLY ||
 929             b->xid != d->xid) {
 930                 if (net_ratelimit())
 931                         printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
 932                                "op[%x] xid[%x]\n",
 933                                b->op, b->xid);
 934                 goto drop_unlock;
 935         }
 936
 937         /* Is it a reply for the device we are configuring? */
 938         if (b->xid != ic_dev_xid) {
 939                 if (net_ratelimit())
 940                         printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet \n");
 941                 goto drop_unlock;
 942         }
 943
 944         /* Parse extensions */
 945         if (ext_len >= 4 &&
 946             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
 947                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
 948                 u8 *ext;
 949
 950 #ifdef IPCONFIG_DHCP
 951                 if (ic_proto_enabled & IC_USE_DHCP) {
 952                         __be32 server_id = NONE;
 953                         int mt = 0;
 954
 955                         ext = &b->exten[4];
 956                         while (ext < end && *ext != 0xff) {
 957                                 u8 *opt = ext++;
 958                                 if (*opt == 0)  /* Padding */
 959                                         continue;
 960                                 ext += *ext + 1;
 961                                 if (ext >= end)
 962                                         break;
 963                                 switch (*opt) {
 964                                 case 53:        /* Message type */
 965                                         if (opt[1])
 966                                                 mt = opt[2];
 967                                         break;
 968                                 case 54:        /* Server ID (IP address) */
 969                                         if (opt[1] >= 4)
 970                                                 memcpy(&server_id, opt + 2, 4);
 971                                         break;
 972                                 }
 973                         }
 974
 975 #ifdef IPCONFIG_DEBUG
 976                         printk("DHCP: Got message type %d\n", mt);
 977 #endif
 978
 979                         switch (mt) {
 980                         case DHCPOFFER:
 981                                 /* While in the process of accepting one offer,
 982                                  * ignore all others.
 983                                  */
 984                                 if (ic_myaddr != NONE)
 985                                         goto drop_unlock;
 986
 987                                 /* Let's accept that offer. */
 988                                 ic_myaddr = b->your_ip;
 989                                 ic_servaddr = server_id;
 990 #ifdef IPCONFIG_DEBUG
 991                                 printk("DHCP: Offered address %pI4 by server %pI4\n",
 992                                        &ic_myaddr, &ic_servaddr);
 993 #endif
 994                                 /* The DHCP indicated server address takes
 995                                  * precedence over the bootp header one if
 996                                  * they are different.
 997                                  */
 998                                 if ((server_id != NONE) &&
 999                                     (b->server_ip != server_id))
1000                                         b->server_ip = ic_servaddr;
1001                                 break;
1002
1003                         case DHCPACK:
1004                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1005                                         goto drop_unlock;
1006
1007                                 /* Yeah! */
1008                                 break;
1009
1010                         default:
1011                                 /* Urque.  Forget it*/
1012                                 ic_myaddr = NONE;
1013                                 ic_servaddr = NONE;
1014                                 goto drop_unlock;
1015                         }
1016
1017                         ic_dhcp_msgtype = mt;
1018
1019                 }
1020 #endif /* IPCONFIG_DHCP */
1021
1022                 ext = &b->exten[4];
1023                 while (ext < end && *ext != 0xff) {
1024                         u8 *opt = ext++;
1025                         if (*opt == 0)  /* Padding */
1026                                 continue;
1027                         ext += *ext + 1;
1028                         if (ext < end)
1029                                 ic_do_bootp_ext(opt);
1030                 }
1031         }
1032
1033         /* We have a winner! */
1034         ic_dev = dev;
1035         ic_myaddr = b->your_ip;
1036         ic_servaddr = b->server_ip;
1037         if (ic_gateway == NONE && b->relay_ip)
1038                 ic_gateway = b->relay_ip;
1039         if (ic_nameservers[0] == NONE)
1040                 ic_nameservers[0] = ic_servaddr;
1041         ic_got_reply = IC_BOOTP;
1042
1043 drop_unlock:
1044         /* Show's over.  Nothing to see here.  */
1045         spin_unlock(&ic_recv_lock);
1046
1047 drop:
1048         /* Throw the packet out. */
1049         kfree_skb(skb);
1050
1051         return 0;
1052 }
1053
1054
1055 #endif
1056
1057
1058 /*
1059  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1060  */
1061
1062 #ifdef IPCONFIG_DYNAMIC
1063
1064 static int __init ic_dynamic(void)
1065 {
1066         int retries;
1067         struct ic_device *d;
1068         unsigned long start_jiffies, timeout, jiff;
1069         int do_bootp = ic_proto_have_if & IC_BOOTP;
1070         int do_rarp = ic_proto_have_if & IC_RARP;
1071
1072         /*
1073          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1074          * This routine gets only called when some pieces of information
1075          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1076          */
1077         if (!ic_proto_enabled) {
1078                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1079                 return -1;
1080         }
1081
1082 #ifdef IPCONFIG_BOOTP
1083         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1084                 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1085 #endif
1086 #ifdef IPCONFIG_RARP
1087         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1088                 printk(KERN_ERR "RARP: No suitable device found.\n");
1089 #endif
1090
1091         if (!ic_proto_have_if)
1092                 /* Error message already printed */
1093                 return -1;
1094
1095         /*
1096          * Setup protocols
1097          */
1098 #ifdef IPCONFIG_BOOTP
1099         if (do_bootp)
1100                 ic_bootp_init();
1101 #endif
1102 #ifdef IPCONFIG_RARP
1103         if (do_rarp)
1104                 ic_rarp_init();
1105 #endif
1106
1107         /*
1108          * Send requests and wait, until we get an answer. This loop
1109          * seems to be a terrible waste of CPU time, but actually there is
1110          * only one process running at all, so we don't need to use any
1111          * scheduler functions.
1112          * [Actually we could now, but the nothing else running note still
1113          *  applies.. - AC]
1114          */
1115         printk(KERN_NOTICE "Sending %s%s%s requests .",
1116                do_bootp
1117                 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1118                (do_bootp && do_rarp) ? " and " : "",
1119                do_rarp ? "RARP" : "");
1120
1121         start_jiffies = jiffies;
1122         d = ic_first_dev;
1123         retries = CONF_SEND_RETRIES;
1124         get_random_bytes(&timeout, sizeof(timeout));
1125         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1126         for (;;) {
1127                 /* Track the device we are configuring */
1128                 ic_dev_xid = d->xid;
1129
1130 #ifdef IPCONFIG_BOOTP
1131                 if (do_bootp && (d->able & IC_BOOTP))
1132                         ic_bootp_send_if(d, jiffies - start_jiffies);
1133 #endif
1134 #ifdef IPCONFIG_RARP
1135                 if (do_rarp && (d->able & IC_RARP))
1136                         ic_rarp_send_if(d);
1137 #endif
1138
1139                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1140                 while (time_before(jiffies, jiff) && !ic_got_reply)
1141                         schedule_timeout_uninterruptible(1);
1142 #ifdef IPCONFIG_DHCP
1143                 /* DHCP isn't done until we get a DHCPACK. */
1144                 if ((ic_got_reply & IC_BOOTP)
1145                     && (ic_proto_enabled & IC_USE_DHCP)
1146                     && ic_dhcp_msgtype != DHCPACK)
1147                 {
1148                         ic_got_reply = 0;
1149                         printk(",");
1150                         continue;
1151                 }
1152 #endif /* IPCONFIG_DHCP */
1153
1154                 if (ic_got_reply) {
1155                         printk(" OK\n");
1156                         break;
1157                 }
1158
1159                 if ((d = d->next))
1160                         continue;
1161
1162                 if (! --retries) {
1163                         printk(" timed out!\n");
1164                         break;
1165                 }
1166
1167                 d = ic_first_dev;
1168
1169                 timeout = timeout CONF_TIMEOUT_MULT;
1170                 if (timeout > CONF_TIMEOUT_MAX)
1171                         timeout = CONF_TIMEOUT_MAX;
1172
1173                 printk(".");
1174         }
1175
1176 #ifdef IPCONFIG_BOOTP
1177         if (do_bootp)
1178                 ic_bootp_cleanup();
1179 #endif
1180 #ifdef IPCONFIG_RARP
1181         if (do_rarp)
1182                 ic_rarp_cleanup();
1183 #endif
1184
1185         if (!ic_got_reply) {
1186                 ic_myaddr = NONE;
1187                 return -1;
1188         }
1189
1190         printk("IP-Config: Got %s answer from %pI4, ",
1191                 ((ic_got_reply & IC_RARP) ? "RARP"
1192                  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1193                 &ic_servaddr);
1194         printk("my address is %pI4\n", &ic_myaddr);
1195
1196         return 0;
1197 }
1198
1199 #endif /* IPCONFIG_DYNAMIC */
1200
1201 #ifdef CONFIG_PROC_FS
1202
1203 static int pnp_seq_show(struct seq_file *seq, void *v)
1204 {
1205         int i;
1206
1207         if (ic_proto_used & IC_PROTO)
1208                 seq_printf(seq, "#PROTO: %s\n",
1209                            (ic_proto_used & IC_RARP) ? "RARP"
1210                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1211         else
1212                 seq_puts(seq, "#MANUAL\n");
1213
1214         if (ic_domain[0])
1215                 seq_printf(seq,
1216                            "domain %s\n", ic_domain);
1217         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1218                 if (ic_nameservers[i] != NONE)
1219                         seq_printf(seq, "nameserver %pI4\n",
1220                                    &ic_nameservers[i]);
1221         }
1222         if (ic_servaddr != NONE)
1223                 seq_printf(seq, "bootserver %pI4\n",
1224                            &ic_servaddr);
1225         return 0;
1226 }
1227
1228 static int pnp_seq_open(struct inode *indoe, struct file *file)
1229 {
1230         return single_open(file, pnp_seq_show, NULL);
1231 }
1232
1233 static const struct file_operations pnp_seq_fops = {
1234         .owner          = THIS_MODULE,
1235         .open           = pnp_seq_open,
1236         .read           = seq_read,
1237         .llseek         = seq_lseek,
1238         .release        = single_release,
1239 };
1240 #endif /* CONFIG_PROC_FS */
1241
1242 /*
1243  *  Extract IP address from the parameter string if needed. Note that we
1244  *  need to have root_server_addr set _before_ IPConfig gets called as it
1245  *  can override it.
1246  */
1247 __be32 __init root_nfs_parse_addr(char *name)
1248 {
1249         __be32 addr;
1250         int octets = 0;
1251         char *cp, *cq;
1252
1253         cp = cq = name;
1254         while (octets < 4) {
1255                 while (*cp >= '0' && *cp <= '9')
1256                         cp++;
1257                 if (cp == cq || cp - cq > 3)
1258                         break;
1259                 if (*cp == '.' || octets == 3)
1260                         octets++;
1261                 if (octets < 4)
1262                         cp++;
1263                 cq = cp;
1264         }
1265         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1266                 if (*cp == ':')
1267                         *cp++ = '\0';
1268                 addr = in_aton(name);
1269                 memmove(name, cp, strlen(cp) + 1);
1270         } else
1271                 addr = NONE;
1272
1273         return addr;
1274 }
1275
1276 /*
1277  *      IP Autoconfig dispatcher.
1278  */
1279
1280 static int __init ip_auto_config(void)
1281 {
1282         __be32 addr;
1283 #ifdef IPCONFIG_DYNAMIC
1284         int retries = CONF_OPEN_RETRIES;
1285 #endif
1286
1287 #ifdef CONFIG_PROC_FS
1288         proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1289 #endif /* CONFIG_PROC_FS */
1290
1291         if (!ic_enable)
1292                 return 0;
1293
1294         DBG(("IP-Config: Entered.\n"));
1295 #ifdef IPCONFIG_DYNAMIC
1296  try_try_again:
1297 #endif
1298         /* Give hardware a chance to settle */
1299         msleep(CONF_PRE_OPEN);
1300
1301         /* Setup all network devices */
1302         if (ic_open_devs() < 0)
1303                 return -1;
1304
1305         /* Give drivers a chance to settle */
1306         ssleep(CONF_POST_OPEN);
1307
1308         /*
1309          * If the config information is insufficient (e.g., our IP address or
1310          * IP address of the boot server is missing or we have multiple network
1311          * interfaces and no default was set), use BOOTP or RARP to get the
1312          * missing values.
1313          */
1314         if (ic_myaddr == NONE ||
1315 #ifdef CONFIG_ROOT_NFS
1316             (root_server_addr == NONE
1317              && ic_servaddr == NONE
1318              && ROOT_DEV == Root_NFS) ||
1319 #endif
1320             ic_first_dev->next) {
1321 #ifdef IPCONFIG_DYNAMIC
1322                 if (ic_dynamic() < 0) {
1323                         ic_close_devs();
1324
1325                         /*
1326                          * I don't know why, but sometimes the
1327                          * eepro100 driver (at least) gets upset and
1328                          * doesn't work the first time it's opened.
1329                          * But then if you close it and reopen it, it
1330                          * works just fine.  So we need to try that at
1331                          * least once before giving up.
1332                          *
1333                          * Also, if the root will be NFS-mounted, we
1334                          * have nowhere to go if DHCP fails.  So we
1335                          * just have to keep trying forever.
1336                          *
1337                          *                              -- Chip
1338                          */
1339 #ifdef CONFIG_ROOT_NFS
1340                         if (ROOT_DEV ==  Root_NFS) {
1341                                 printk(KERN_ERR
1342                                         "IP-Config: Retrying forever (NFS root)...\n");
1343                                 goto try_try_again;
1344                         }
1345 #endif
1346
1347                         if (--retries) {
1348                                 printk(KERN_ERR
1349                                        "IP-Config: Reopening network devices...\n");
1350                                 goto try_try_again;
1351                         }
1352
1353                         /* Oh, well.  At least we tried. */
1354                         printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1355                         return -1;
1356                 }
1357 #else /* !DYNAMIC */
1358                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1359                 ic_close_devs();
1360                 return -1;
1361 #endif /* IPCONFIG_DYNAMIC */
1362         } else {
1363                 /* Device selected manually or only one device -> use it */
1364                 ic_dev = ic_first_dev->dev;
1365         }
1366
1367         addr = root_nfs_parse_addr(root_server_path);
1368         if (root_server_addr == NONE)
1369                 root_server_addr = addr;
1370
1371         /*
1372          * Use defaults whereever applicable.
1373          */
1374         if (ic_defaults() < 0)
1375                 return -1;
1376
1377         /*
1378          * Close all network devices except the device we've
1379          * autoconfigured and set up routes.
1380          */
1381         ic_close_devs();
1382         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1383                 return -1;
1384
1385         /*
1386          * Record which protocol was actually used.
1387          */
1388 #ifdef IPCONFIG_DYNAMIC
1389         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1390 #endif
1391
1392 #ifndef IPCONFIG_SILENT
1393         /*
1394          * Clue in the operator.
1395          */
1396         printk("IP-Config: Complete:");
1397         printk("\n     device=%s", ic_dev->name);
1398         printk(", addr=%pI4", &ic_myaddr);
1399         printk(", mask=%pI4", &ic_netmask);
1400         printk(", gw=%pI4", &ic_gateway);
1401         printk(",\n     host=%s, domain=%s, nis-domain=%s",
1402                utsname()->nodename, ic_domain, utsname()->domainname);
1403         printk(",\n     bootserver=%pI4", &ic_servaddr);
1404         printk(", rootserver=%pI4", &root_server_addr);
1405         printk(", rootpath=%s", root_server_path);
1406         printk("\n");
1407 #endif /* !SILENT */
1408
1409         return 0;
1410 }
1411
1412 late_initcall(ip_auto_config);
1413
1414
1415 /*
1416  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1417  *  command line parameter.  See Documentation/filesystems/nfsroot.txt.
1418  */
1419 static int __init ic_proto_name(char *name)
1420 {
1421         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1422                 return 1;
1423         }
1424         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1425                 return 0;
1426         }
1427 #ifdef CONFIG_IP_PNP_DHCP
1428         else if (!strcmp(name, "dhcp")) {
1429                 ic_proto_enabled &= ~IC_RARP;
1430                 return 1;
1431         }
1432 #endif
1433 #ifdef CONFIG_IP_PNP_BOOTP
1434         else if (!strcmp(name, "bootp")) {
1435                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1436                 return 1;
1437         }
1438 #endif
1439 #ifdef CONFIG_IP_PNP_RARP
1440         else if (!strcmp(name, "rarp")) {
1441                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1442                 return 1;
1443         }
1444 #endif
1445 #ifdef IPCONFIG_DYNAMIC
1446         else if (!strcmp(name, "both")) {
1447                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1448                 return 1;
1449         }
1450 #endif
1451         return 0;
1452 }
1453
1454 static int __init ip_auto_config_setup(char *addrs)
1455 {
1456         char *cp, *ip, *dp;
1457         int num = 0;
1458
1459         ic_set_manually = 1;
1460         ic_enable = 1;
1461
1462         /*
1463          * If any dhcp, bootp etc options are set, leave autoconfig on
1464          * and skip the below static IP processing.
1465          */
1466         if (ic_proto_name(addrs))
1467                 return 1;
1468
1469         /* If no static IP is given, turn off autoconfig and bail.  */
1470         if (*addrs == 0 ||
1471             strcmp(addrs, "off") == 0 ||
1472             strcmp(addrs, "none") == 0) {
1473                 ic_enable = 0;
1474                 return 1;
1475         }
1476
1477         /* Parse string for static IP assignment.  */
1478         ip = addrs;
1479         while (ip && *ip) {
1480                 if ((cp = strchr(ip, ':')))
1481                         *cp++ = '\0';
1482                 if (strlen(ip) > 0) {
1483                         DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1484                         switch (num) {
1485                         case 0:
1486                                 if ((ic_myaddr = in_aton(ip)) == ANY)
1487                                         ic_myaddr = NONE;
1488                                 break;
1489                         case 1:
1490                                 if ((ic_servaddr = in_aton(ip)) == ANY)
1491                                         ic_servaddr = NONE;
1492                                 break;
1493                         case 2:
1494                                 if ((ic_gateway = in_aton(ip)) == ANY)
1495                                         ic_gateway = NONE;
1496                                 break;
1497                         case 3:
1498                                 if ((ic_netmask = in_aton(ip)) == ANY)
1499                                         ic_netmask = NONE;
1500                                 break;
1501                         case 4:
1502                                 if ((dp = strchr(ip, '.'))) {
1503                                         *dp++ = '\0';
1504                                         strlcpy(utsname()->domainname, dp,
1505                                                 sizeof(utsname()->domainname));
1506                                 }
1507                                 strlcpy(utsname()->nodename, ip,
1508                                         sizeof(utsname()->nodename));
1509                                 ic_host_name_set = 1;
1510                                 break;
1511                         case 5:
1512                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1513                                 break;
1514                         case 6:
1515                                 if (ic_proto_name(ip) == 0 &&
1516                                     ic_myaddr == NONE) {
1517                                         ic_enable = 0;
1518                                 }
1519                                 break;
1520                         }
1521                 }
1522                 ip = cp;
1523                 num++;
1524         }
1525
1526         return 1;
1527 }
1528
1529 static int __init nfsaddrs_config_setup(char *addrs)
1530 {
1531         return ip_auto_config_setup(addrs);
1532 }
1533
1534 static int __init vendor_class_identifier_setup(char *addrs)
1535 {
1536         if (strlcpy(vendor_class_identifier, addrs,
1537                     sizeof(vendor_class_identifier))
1538             >= sizeof(vendor_class_identifier))
1539                 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1540                        vendor_class_identifier);
1541         return 1;
1542 }
1543
1544 __setup("ip=", ip_auto_config_setup);
1545 __setup("nfsaddrs=", nfsaddrs_config_setup);
1546 __setup("dhcpclass=", vendor_class_identifier_setup);