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 <linux/slab.h>
  57 #include <net/net_namespace.h>
  58 #include <net/arp.h>
  59 #include <net/ip.h>
  60 #include <net/ipconfig.h>
  61 #include <net/route.h>
  62
  63 #include <asm/uaccess.h>
  64 #include <net/checksum.h>
  65 #include <asm/processor.h>
  66
  67 /* Define this to allow debugging output */
  68 #undef IPCONFIG_DEBUG
  69
  70 #ifdef IPCONFIG_DEBUG
  71 #define DBG(x) printk x
  72 #else
  73 #define DBG(x) do { } while(0)
  74 #endif
  75
  76 #if defined(CONFIG_IP_PNP_DHCP)
  77 #define IPCONFIG_DHCP
  78 #endif
  79 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
  80 #define IPCONFIG_BOOTP
  81 #endif
  82 #if defined(CONFIG_IP_PNP_RARP)
  83 #define IPCONFIG_RARP
  84 #endif
  85 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
  86 #define IPCONFIG_DYNAMIC
  87 #endif
  88
  89 /* Define the friendly delay before and after opening net devices */
  90 #define CONF_PRE_OPEN           500     /* Before opening: 1/2 second */
  91 #define CONF_POST_OPEN          1       /* After opening: 1 second */
  92
  93 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
  94 #define CONF_OPEN_RETRIES       2       /* (Re)open devices twice */
  95 #define CONF_SEND_RETRIES       6       /* Send six requests per open */
  96 #define CONF_INTER_TIMEOUT      (HZ/2)  /* Inter-device timeout: 1/2 second */
  97 #define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
  98 #define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
  99 #define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
 100 #define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
 101 #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
 102                                            - '3' from resolv.h */
 103
 104 #define NONE cpu_to_be32(INADDR_NONE)
 105 #define ANY cpu_to_be32(INADDR_ANY)
 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 u32 ic_dev_xid;         /* Device under configuration */
 144
 145 /* vendor class identifier */
 146 static char vendor_class_identifier[253] __initdata;
 147
 148 /* Persistent data: */
 149
 150 static int ic_proto_used;                       /* Protocol used, if any */
 151 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
 152 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
 153
 154 /*
 155  * Private state.
 156  */
 157
 158 /* Name of user-selected boot device */
 159 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
 160
 161 /* Protocols supported by available interfaces */
 162 static int ic_proto_have_if __initdata = 0;
 163
 164 /* MTU for boot device */
 165 static int ic_dev_mtu __initdata = 0;
 166
 167 #ifdef IPCONFIG_DYNAMIC
 168 static DEFINE_SPINLOCK(ic_recv_lock);
 169 static volatile int ic_got_reply __initdata = 0;    /* Proto(s) that replied */
 170 #endif
 171 #ifdef IPCONFIG_DHCP
 172 static int ic_dhcp_msgtype __initdata = 0;      /* DHCP msg type received */
 173 #endif
 174
 175
 176 /*
 177  *      Network devices
 178  */
 179
 180 struct ic_device {
 181         struct ic_device *next;
 182         struct net_device *dev;
 183         unsigned short flags;
 184         short able;
 185         __be32 xid;
 186 };
 187
 188 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
 189 static struct net_device *ic_dev __initdata = NULL;     /* Selected device */
 190
 191 static bool __init ic_device_match(struct net_device *dev)
 192 {
 193         if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
 194             (!(dev->flags & IFF_LOOPBACK) &&
 195              (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
 196              strncmp(dev->name, "dummy", 5)))
 197                 return true;
 198         return false;
 199 }
 200
 201 static int __init ic_open_devs(void)
 202 {
 203         struct ic_device *d, **last;
 204         struct net_device *dev;
 205         unsigned short oflags;
 206
 207         last = &ic_first_dev;
 208         rtnl_lock();
 209
 210         /* bring loopback device up first */
 211         for_each_netdev(&init_net, dev) {
 212                 if (!(dev->flags & IFF_LOOPBACK))
 213                         continue;
 214                 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
 215                         printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
 216         }
 217
 218         for_each_netdev(&init_net, dev) {
 219                 if (dev->flags & IFF_LOOPBACK)
 220                         continue;
 221                 if (ic_device_match(dev)) {
 222                         int able = 0;
 223                         if (dev->mtu >= 364)
 224                                 able |= IC_BOOTP;
 225                         else
 226                                 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
 227                         if (!(dev->flags & IFF_NOARP))
 228                                 able |= IC_RARP;
 229                         able &= ic_proto_enabled;
 230                         if (ic_proto_enabled && !able)
 231                                 continue;
 232                         oflags = dev->flags;
 233                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
 234                                 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
 235                                 continue;
 236                         }
 237                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
 238                                 rtnl_unlock();
 239                                 return -ENOMEM;
 240                         }
 241                         d->dev = dev;
 242                         *last = d;
 243                         last = &d->next;
 244                         d->flags = oflags;
 245                         d->able = able;
 246                         if (able & IC_BOOTP)
 247                                 get_random_bytes(&d->xid, sizeof(__be32));
 248                         else
 249                                 d->xid = 0;
 250                         ic_proto_have_if |= able;
 251                         DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
 252                                 dev->name, able, d->xid));
 253                 }
 254         }
 255         rtnl_unlock();
 256
 257         *last = NULL;
 258
 259         if (!ic_first_dev) {
 260                 if (user_dev_name[0])
 261                         printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
 262                 else
 263                         printk(KERN_ERR "IP-Config: No network devices available.\n");
 264                 return -ENODEV;
 265         }
 266         return 0;
 267 }
 268
 269 static void __init ic_close_devs(void)
 270 {
 271         struct ic_device *d, *next;
 272         struct net_device *dev;
 273
 274         rtnl_lock();
 275         next = ic_first_dev;
 276         while ((d = next)) {
 277                 next = d->next;
 278                 dev = d->dev;
 279                 if (dev != ic_dev) {
 280                         DBG(("IP-Config: Downing %s\n", dev->name));
 281                         dev_change_flags(dev, d->flags);
 282                 }
 283                 kfree(d);
 284         }
 285         rtnl_unlock();
 286 }
 287
 288 /*
 289  *      Interface to various network functions.
 290  */
 291
 292 static inline void
 293 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
 294 {
 295         sin->sin_family = AF_INET;
 296         sin->sin_addr.s_addr = addr;
 297         sin->sin_port = port;
 298 }
 299
 300 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
 301 {
 302         int res;
 303
 304         mm_segment_t oldfs = get_fs();
 305         set_fs(get_ds());
 306         res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
 307         set_fs(oldfs);
 308         return res;
 309 }
 310
 311 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
 312 {
 313         int res;
 314
 315         mm_segment_t oldfs = get_fs();
 316         set_fs(get_ds());
 317         res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
 318         set_fs(oldfs);
 319         return res;
 320 }
 321
 322 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
 323 {
 324         int res;
 325
 326         mm_segment_t oldfs = get_fs();
 327         set_fs(get_ds());
 328         res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
 329         set_fs(oldfs);
 330         return res;
 331 }
 332
 333 /*
 334  *      Set up interface addresses and routes.
 335  */
 336
 337 static int __init ic_setup_if(void)
 338 {
 339         struct ifreq ir;
 340         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
 341         int err;
 342
 343         memset(&ir, 0, sizeof(ir));
 344         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
 345         set_sockaddr(sin, ic_myaddr, 0);
 346         if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
 347                 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
 348                 return -1;
 349         }
 350         set_sockaddr(sin, ic_netmask, 0);
 351         if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
 352                 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
 353                 return -1;
 354         }
 355         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
 356         if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
 357                 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
 358                 return -1;
 359         }
 360         /* Handle the case where we need non-standard MTU on the boot link (a network
 361          * using jumbo frames, for instance).  If we can't set the mtu, don't error
 362          * out, we'll try to muddle along.
 363          */
 364         if (ic_dev_mtu != 0) {
 365                 strcpy(ir.ifr_name, ic_dev->name);
 366                 ir.ifr_mtu = ic_dev_mtu;
 367                 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
 368                         printk(KERN_ERR "IP-Config: Unable to set interface mtu to %d (%d).\n",
 369                                          ic_dev_mtu, err);
 370         }
 371         return 0;
 372 }
 373
 374 static int __init ic_setup_routes(void)
 375 {
 376         /* No need to setup device routes, only the default route... */
 377
 378         if (ic_gateway != NONE) {
 379                 struct rtentry rm;
 380                 int err;
 381
 382                 memset(&rm, 0, sizeof(rm));
 383                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
 384                         printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
 385                         return -1;
 386                 }
 387                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
 388                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
 389                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
 390                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
 391                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
 392                         printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
 393                         return -1;
 394                 }
 395         }
 396
 397         return 0;
 398 }
 399
 400 /*
 401  *      Fill in default values for all missing parameters.
 402  */
 403
 404 static int __init ic_defaults(void)
 405 {
 406         /*
 407          *      At this point we have no userspace running so need not
 408          *      claim locks on system_utsname
 409          */
 410
 411         if (!ic_host_name_set)
 412                 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
 413
 414         if (root_server_addr == NONE)
 415                 root_server_addr = ic_servaddr;
 416
 417         if (ic_netmask == NONE) {
 418                 if (IN_CLASSA(ntohl(ic_myaddr)))
 419                         ic_netmask = htonl(IN_CLASSA_NET);
 420                 else if (IN_CLASSB(ntohl(ic_myaddr)))
 421                         ic_netmask = htonl(IN_CLASSB_NET);
 422                 else if (IN_CLASSC(ntohl(ic_myaddr)))
 423                         ic_netmask = htonl(IN_CLASSC_NET);
 424                 else {
 425                         printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n",
 426                                 &ic_myaddr);
 427                         return -1;
 428                 }
 429                 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
 430         }
 431
 432         return 0;
 433 }
 434
 435 /*
 436  *      RARP support.
 437  */
 438
 439 #ifdef IPCONFIG_RARP
 440
 441 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 442
 443 static struct packet_type rarp_packet_type __initdata = {
 444         .type = cpu_to_be16(ETH_P_RARP),
 445         .func = ic_rarp_recv,
 446 };
 447
 448 static inline void __init ic_rarp_init(void)
 449 {
 450         dev_add_pack(&rarp_packet_type);
 451 }
 452
 453 static inline void __init ic_rarp_cleanup(void)
 454 {
 455         dev_remove_pack(&rarp_packet_type);
 456 }
 457
 458 /*
 459  *  Process received RARP packet.
 460  */
 461 static int __init
 462 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 463 {
 464         struct arphdr *rarp;
 465         unsigned char *rarp_ptr;
 466         __be32 sip, tip;
 467         unsigned char *sha, *tha;               /* s for "source", t for "target" */
 468         struct ic_device *d;
 469
 470         if (!net_eq(dev_net(dev), &init_net))
 471                 goto drop;
 472
 473         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 474                 return NET_RX_DROP;
 475
 476         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
 477                 goto drop;
 478
 479         /* Basic sanity checks can be done without the lock.  */
 480         rarp = (struct arphdr *)skb_transport_header(skb);
 481
 482         /* If this test doesn't pass, it's not IP, or we should
 483          * ignore it anyway.
 484          */
 485         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
 486                 goto drop;
 487
 488         /* If it's not a RARP reply, delete it. */
 489         if (rarp->ar_op != htons(ARPOP_RREPLY))
 490                 goto drop;
 491
 492         /* If it's not Ethernet, delete it. */
 493         if (rarp->ar_pro != htons(ETH_P_IP))
 494                 goto drop;
 495
 496         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
 497                 goto drop;
 498
 499         /* OK, it is all there and looks valid, process... */
 500         rarp = (struct arphdr *)skb_transport_header(skb);
 501         rarp_ptr = (unsigned char *) (rarp + 1);
 502
 503         /* One reply at a time, please. */
 504         spin_lock(&ic_recv_lock);
 505
 506         /* If we already have a reply, just drop the packet */
 507         if (ic_got_reply)
 508                 goto drop_unlock;
 509
 510         /* Find the ic_device that the packet arrived on */
 511         d = ic_first_dev;
 512         while (d && d->dev != dev)
 513                 d = d->next;
 514         if (!d)
 515                 goto drop_unlock;       /* should never happen */
 516
 517         /* Extract variable-width fields */
 518         sha = rarp_ptr;
 519         rarp_ptr += dev->addr_len;
 520         memcpy(&sip, rarp_ptr, 4);
 521         rarp_ptr += 4;
 522         tha = rarp_ptr;
 523         rarp_ptr += dev->addr_len;
 524         memcpy(&tip, rarp_ptr, 4);
 525
 526         /* Discard packets which are not meant for us. */
 527         if (memcmp(tha, dev->dev_addr, dev->addr_len))
 528                 goto drop_unlock;
 529
 530         /* Discard packets which are not from specified server. */
 531         if (ic_servaddr != NONE && ic_servaddr != sip)
 532                 goto drop_unlock;
 533
 534         /* We have a winner! */
 535         ic_dev = dev;
 536         if (ic_myaddr == NONE)
 537                 ic_myaddr = tip;
 538         ic_servaddr = sip;
 539         ic_got_reply = IC_RARP;
 540
 541 drop_unlock:
 542         /* Show's over.  Nothing to see here.  */
 543         spin_unlock(&ic_recv_lock);
 544
 545 drop:
 546         /* Throw the packet out. */
 547         kfree_skb(skb);
 548         return 0;
 549 }
 550
 551
 552 /*
 553  *  Send RARP request packet over a single interface.
 554  */
 555 static void __init ic_rarp_send_if(struct ic_device *d)
 556 {
 557         struct net_device *dev = d->dev;
 558         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
 559                  dev->dev_addr, dev->dev_addr);
 560 }
 561 #endif
 562
 563 /*
 564  *      DHCP/BOOTP support.
 565  */
 566
 567 #ifdef IPCONFIG_BOOTP
 568
 569 struct bootp_pkt {              /* BOOTP packet format */
 570         struct iphdr iph;       /* IP header */
 571         struct udphdr udph;     /* UDP header */
 572         u8 op;                  /* 1=request, 2=reply */
 573         u8 htype;               /* HW address type */
 574         u8 hlen;                /* HW address length */
 575         u8 hops;                /* Used only by gateways */
 576         __be32 xid;             /* Transaction ID */
 577         __be16 secs;            /* Seconds since we started */
 578         __be16 flags;           /* Just what it says */
 579         __be32 client_ip;               /* Client's IP address if known */
 580         __be32 your_ip;         /* Assigned IP address */
 581         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
 582         __be32 relay_ip;                /* IP address of BOOTP relay */
 583         u8 hw_addr[16];         /* Client's HW address */
 584         u8 serv_name[64];       /* Server host name */
 585         u8 boot_file[128];      /* Name of boot file */
 586         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
 587 };
 588
 589 /* packet ops */
 590 #define BOOTP_REQUEST   1
 591 #define BOOTP_REPLY     2
 592
 593 /* DHCP message types */
 594 #define DHCPDISCOVER    1
 595 #define DHCPOFFER       2
 596 #define DHCPREQUEST     3
 597 #define DHCPDECLINE     4
 598 #define DHCPACK         5
 599 #define DHCPNAK         6
 600 #define DHCPRELEASE     7
 601 #define DHCPINFORM      8
 602
 603 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 604
 605 static struct packet_type bootp_packet_type __initdata = {
 606         .type = cpu_to_be16(ETH_P_IP),
 607         .func = ic_bootp_recv,
 608 };
 609
 610
 611 /*
 612  *  Initialize DHCP/BOOTP extension fields in the request.
 613  */
 614
 615 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
 616
 617 #ifdef IPCONFIG_DHCP
 618
 619 static void __init
 620 ic_dhcp_init_options(u8 *options)
 621 {
 622         u8 mt = ((ic_servaddr == NONE)
 623                  ? DHCPDISCOVER : DHCPREQUEST);
 624         u8 *e = options;
 625         int len;
 626
 627 #ifdef IPCONFIG_DEBUG
 628         printk("DHCP: Sending message type %d\n", mt);
 629 #endif
 630
 631         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 632         e += 4;
 633
 634         *e++ = 53;              /* DHCP message type */
 635         *e++ = 1;
 636         *e++ = mt;
 637
 638         if (mt == DHCPREQUEST) {
 639                 *e++ = 54;      /* Server ID (IP address) */
 640                 *e++ = 4;
 641                 memcpy(e, &ic_servaddr, 4);
 642                 e += 4;
 643
 644                 *e++ = 50;      /* Requested IP address */
 645                 *e++ = 4;
 646                 memcpy(e, &ic_myaddr, 4);
 647                 e += 4;
 648         }
 649
 650         /* always? */
 651         {
 652                 static const u8 ic_req_params[] = {
 653                         1,      /* Subnet mask */
 654                         3,      /* Default gateway */
 655                         6,      /* DNS server */
 656                         12,     /* Host name */
 657                         15,     /* Domain name */
 658                         17,     /* Boot path */
 659                         26,     /* MTU */
 660                         40,     /* NIS domain name */
 661                 };
 662
 663                 *e++ = 55;      /* Parameter request list */
 664                 *e++ = sizeof(ic_req_params);
 665                 memcpy(e, ic_req_params, sizeof(ic_req_params));
 666                 e += sizeof(ic_req_params);
 667
 668                 if (ic_host_name_set) {
 669                         *e++ = 12;      /* host-name */
 670                         len = strlen(utsname()->nodename);
 671                         *e++ = len;
 672                         memcpy(e, utsname()->nodename, len);
 673                         e += len;
 674                 }
 675                 if (*vendor_class_identifier) {
 676                         printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
 677                                vendor_class_identifier);
 678                         *e++ = 60;      /* Class-identifier */
 679                         len = strlen(vendor_class_identifier);
 680                         *e++ = len;
 681                         memcpy(e, vendor_class_identifier, len);
 682                         e += len;
 683                 }
 684         }
 685
 686         *e++ = 255;     /* End of the list */
 687 }
 688
 689 #endif /* IPCONFIG_DHCP */
 690
 691 static void __init ic_bootp_init_ext(u8 *e)
 692 {
 693         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 694         e += 4;
 695         *e++ = 1;               /* Subnet mask request */
 696         *e++ = 4;
 697         e += 4;
 698         *e++ = 3;               /* Default gateway request */
 699         *e++ = 4;
 700         e += 4;
 701         *e++ = 5;               /* Name server request */
 702         *e++ = 8;
 703         e += 8;
 704         *e++ = 12;              /* Host name request */
 705         *e++ = 32;
 706         e += 32;
 707         *e++ = 40;              /* NIS Domain name request */
 708         *e++ = 32;
 709         e += 32;
 710         *e++ = 17;              /* Boot path */
 711         *e++ = 40;
 712         e += 40;
 713
 714         *e++ = 57;              /* set extension buffer size for reply */
 715         *e++ = 2;
 716         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
 717         *e++ = 150;
 718
 719         *e++ = 255;             /* End of the list */
 720 }
 721
 722
 723 /*
 724  *  Initialize the DHCP/BOOTP mechanism.
 725  */
 726 static inline void __init ic_bootp_init(void)
 727 {
 728         int i;
 729
 730         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
 731                 ic_nameservers[i] = NONE;
 732
 733         dev_add_pack(&bootp_packet_type);
 734 }
 735
 736
 737 /*
 738  *  DHCP/BOOTP cleanup.
 739  */
 740 static inline void __init ic_bootp_cleanup(void)
 741 {
 742         dev_remove_pack(&bootp_packet_type);
 743 }
 744
 745
 746 /*
 747  *  Send DHCP/BOOTP request to single interface.
 748  */
 749 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
 750 {
 751         struct net_device *dev = d->dev;
 752         struct sk_buff *skb;
 753         struct bootp_pkt *b;
 754         struct iphdr *h;
 755
 756         /* Allocate packet */
 757         skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15,
 758                         GFP_KERNEL);
 759         if (!skb)
 760                 return;
 761         skb_reserve(skb, LL_RESERVED_SPACE(dev));
 762         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
 763         memset(b, 0, sizeof(struct bootp_pkt));
 764
 765         /* Construct IP header */
 766         skb_reset_network_header(skb);
 767         h = ip_hdr(skb);
 768         h->version = 4;
 769         h->ihl = 5;
 770         h->tot_len = htons(sizeof(struct bootp_pkt));
 771         h->frag_off = htons(IP_DF);
 772         h->ttl = 64;
 773         h->protocol = IPPROTO_UDP;
 774         h->daddr = htonl(INADDR_BROADCAST);
 775         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
 776
 777         /* Construct UDP header */
 778         b->udph.source = htons(68);
 779         b->udph.dest = htons(67);
 780         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
 781         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
 782
 783         /* Construct DHCP/BOOTP header */
 784         b->op = BOOTP_REQUEST;
 785         if (dev->type < 256) /* check for false types */
 786                 b->htype = dev->type;
 787         else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
 788                 b->htype = ARPHRD_IEEE802;
 789         else if (dev->type == ARPHRD_FDDI)
 790                 b->htype = ARPHRD_ETHER;
 791         else {
 792                 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
 793                 b->htype = dev->type; /* can cause undefined behavior */
 794         }
 795
 796         /* server_ip and your_ip address are both already zero per RFC2131 */
 797         b->hlen = dev->addr_len;
 798         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
 799         b->secs = htons(jiffies_diff / HZ);
 800         b->xid = d->xid;
 801
 802         /* add DHCP options or BOOTP extensions */
 803 #ifdef IPCONFIG_DHCP
 804         if (ic_proto_enabled & IC_USE_DHCP)
 805                 ic_dhcp_init_options(b->exten);
 806         else
 807 #endif
 808                 ic_bootp_init_ext(b->exten);
 809
 810         /* Chain packet down the line... */
 811         skb->dev = dev;
 812         skb->protocol = htons(ETH_P_IP);
 813         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
 814                             dev->broadcast, dev->dev_addr, skb->len) < 0 ||
 815             dev_queue_xmit(skb) < 0)
 816                 printk("E");
 817 }
 818
 819
 820 /*
 821  *  Copy BOOTP-supplied string if not already set.
 822  */
 823 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
 824 {
 825         if (!len)
 826                 return 0;
 827         if (len > max-1)
 828                 len = max-1;
 829         memcpy(dest, src, len);
 830         dest[len] = '\0';
 831         return 1;
 832 }
 833
 834
 835 /*
 836  *  Process BOOTP extensions.
 837  */
 838 static void __init ic_do_bootp_ext(u8 *ext)
 839 {
 840        u8 servers;
 841        int i;
 842         u16 mtu;
 843
 844 #ifdef IPCONFIG_DEBUG
 845         u8 *c;
 846
 847         printk("DHCP/BOOTP: Got extension %d:",*ext);
 848         for (c=ext+2; c<ext+2+ext[1]; c++)
 849                 printk(" %02x", *c);
 850         printk("\n");
 851 #endif
 852
 853         switch (*ext++) {
 854                 case 1:         /* Subnet mask */
 855                         if (ic_netmask == NONE)
 856                                 memcpy(&ic_netmask, ext+1, 4);
 857                         break;
 858                 case 3:         /* Default gateway */
 859                         if (ic_gateway == NONE)
 860                                 memcpy(&ic_gateway, ext+1, 4);
 861                         break;
 862                 case 6:         /* DNS server */
 863                         servers= *ext/4;
 864                         if (servers > CONF_NAMESERVERS_MAX)
 865                                 servers = CONF_NAMESERVERS_MAX;
 866                         for (i = 0; i < servers; i++) {
 867                                 if (ic_nameservers[i] == NONE)
 868                                         memcpy(&ic_nameservers[i], ext+1+4*i, 4);
 869                         }
 870                         break;
 871                 case 12:        /* Host name */
 872                         ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
 873                         ic_host_name_set = 1;
 874                         break;
 875                 case 15:        /* Domain name (DNS) */
 876                         ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
 877                         break;
 878                 case 17:        /* Root path */
 879                         if (!root_server_path[0])
 880                                 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
 881                         break;
 882                 case 26:        /* Interface MTU */
 883                         memcpy(&mtu, ext+1, sizeof(mtu));
 884                         ic_dev_mtu = ntohs(mtu);
 885                         break;
 886                 case 40:        /* NIS Domain name (_not_ DNS) */
 887                         ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
 888                         break;
 889         }
 890 }
 891
 892
 893 /*
 894  *  Receive BOOTP reply.
 895  */
 896 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 897 {
 898         struct bootp_pkt *b;
 899         struct iphdr *h;
 900         struct ic_device *d;
 901         int len, ext_len;
 902
 903         if (!net_eq(dev_net(dev), &init_net))
 904                 goto drop;
 905
 906         /* Perform verifications before taking the lock.  */
 907         if (skb->pkt_type == PACKET_OTHERHOST)
 908                 goto drop;
 909
 910         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 911                 return NET_RX_DROP;
 912
 913         if (!pskb_may_pull(skb,
 914                            sizeof(struct iphdr) +
 915                            sizeof(struct udphdr)))
 916                 goto drop;
 917
 918         b = (struct bootp_pkt *)skb_network_header(skb);
 919         h = &b->iph;
 920
 921         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
 922                 goto drop;
 923
 924         /* Fragments are not supported */
 925         if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
 926                 if (net_ratelimit())
 927                         printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
 928                                "reply.\n");
 929                 goto drop;
 930         }
 931
 932         if (skb->len < ntohs(h->tot_len))
 933                 goto drop;
 934
 935         if (ip_fast_csum((char *) h, h->ihl))
 936                 goto drop;
 937
 938         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
 939                 goto drop;
 940
 941         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
 942                 goto drop;
 943
 944         len = ntohs(b->udph.len) - sizeof(struct udphdr);
 945         ext_len = len - (sizeof(*b) -
 946                          sizeof(struct iphdr) -
 947                          sizeof(struct udphdr) -
 948                          sizeof(b->exten));
 949         if (ext_len < 0)
 950                 goto drop;
 951
 952         /* Ok the front looks good, make sure we can get at the rest.  */
 953         if (!pskb_may_pull(skb, skb->len))
 954                 goto drop;
 955
 956         b = (struct bootp_pkt *)skb_network_header(skb);
 957         h = &b->iph;
 958
 959         /* One reply at a time, please. */
 960         spin_lock(&ic_recv_lock);
 961
 962         /* If we already have a reply, just drop the packet */
 963         if (ic_got_reply)
 964                 goto drop_unlock;
 965
 966         /* Find the ic_device that the packet arrived on */
 967         d = ic_first_dev;
 968         while (d && d->dev != dev)
 969                 d = d->next;
 970         if (!d)
 971                 goto drop_unlock;  /* should never happen */
 972
 973         /* Is it a reply to our BOOTP request? */
 974         if (b->op != BOOTP_REPLY ||
 975             b->xid != d->xid) {
 976                 if (net_ratelimit())
 977                         printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
 978                                "op[%x] xid[%x]\n",
 979                                b->op, b->xid);
 980                 goto drop_unlock;
 981         }
 982
 983         /* Is it a reply for the device we are configuring? */
 984         if (b->xid != ic_dev_xid) {
 985                 if (net_ratelimit())
 986                         printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet\n");
 987                 goto drop_unlock;
 988         }
 989
 990         /* Parse extensions */
 991         if (ext_len >= 4 &&
 992             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
 993                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
 994                 u8 *ext;
 995
 996 #ifdef IPCONFIG_DHCP
 997                 if (ic_proto_enabled & IC_USE_DHCP) {
 998                         __be32 server_id = NONE;
 999                         int mt = 0;
1000
1001                         ext = &b->exten[4];
1002                         while (ext < end && *ext != 0xff) {
1003                                 u8 *opt = ext++;
1004                                 if (*opt == 0)  /* Padding */
1005                                         continue;
1006                                 ext += *ext + 1;
1007                                 if (ext >= end)
1008                                         break;
1009                                 switch (*opt) {
1010                                 case 53:        /* Message type */
1011                                         if (opt[1])
1012                                                 mt = opt[2];
1013                                         break;
1014                                 case 54:        /* Server ID (IP address) */
1015                                         if (opt[1] >= 4)
1016                                                 memcpy(&server_id, opt + 2, 4);
1017                                         break;
1018                                 }
1019                         }
1020
1021 #ifdef IPCONFIG_DEBUG
1022                         printk("DHCP: Got message type %d\n", mt);
1023 #endif
1024
1025                         switch (mt) {
1026                         case DHCPOFFER:
1027                                 /* While in the process of accepting one offer,
1028                                  * ignore all others.
1029                                  */
1030                                 if (ic_myaddr != NONE)
1031                                         goto drop_unlock;
1032
1033                                 /* Let's accept that offer. */
1034                                 ic_myaddr = b->your_ip;
1035                                 ic_servaddr = server_id;
1036 #ifdef IPCONFIG_DEBUG
1037                                 printk("DHCP: Offered address %pI4 by server %pI4\n",
1038                                        &ic_myaddr, &ic_servaddr);
1039 #endif
1040                                 /* The DHCP indicated server address takes
1041                                  * precedence over the bootp header one if
1042                                  * they are different.
1043                                  */
1044                                 if ((server_id != NONE) &&
1045                                     (b->server_ip != server_id))
1046                                         b->server_ip = ic_servaddr;
1047                                 break;
1048
1049                         case DHCPACK:
1050                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1051                                         goto drop_unlock;
1052
1053                                 /* Yeah! */
1054                                 break;
1055
1056                         default:
1057                                 /* Urque.  Forget it*/
1058                                 ic_myaddr = NONE;
1059                                 ic_servaddr = NONE;
1060                                 goto drop_unlock;
1061                         }
1062
1063                         ic_dhcp_msgtype = mt;
1064
1065                 }
1066 #endif /* IPCONFIG_DHCP */
1067
1068                 ext = &b->exten[4];
1069                 while (ext < end && *ext != 0xff) {
1070                         u8 *opt = ext++;
1071                         if (*opt == 0)  /* Padding */
1072                                 continue;
1073                         ext += *ext + 1;
1074                         if (ext < end)
1075                                 ic_do_bootp_ext(opt);
1076                 }
1077         }
1078
1079         /* We have a winner! */
1080         ic_dev = dev;
1081         ic_myaddr = b->your_ip;
1082         ic_servaddr = b->server_ip;
1083         if (ic_gateway == NONE && b->relay_ip)
1084                 ic_gateway = b->relay_ip;
1085         if (ic_nameservers[0] == NONE)
1086                 ic_nameservers[0] = ic_servaddr;
1087         ic_got_reply = IC_BOOTP;
1088
1089 drop_unlock:
1090         /* Show's over.  Nothing to see here.  */
1091         spin_unlock(&ic_recv_lock);
1092
1093 drop:
1094         /* Throw the packet out. */
1095         kfree_skb(skb);
1096
1097         return 0;
1098 }
1099
1100
1101 #endif
1102
1103
1104 /*
1105  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1106  */
1107
1108 #ifdef IPCONFIG_DYNAMIC
1109
1110 static int __init ic_dynamic(void)
1111 {
1112         int retries;
1113         struct ic_device *d;
1114         unsigned long start_jiffies, timeout, jiff;
1115         int do_bootp = ic_proto_have_if & IC_BOOTP;
1116         int do_rarp = ic_proto_have_if & IC_RARP;
1117
1118         /*
1119          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1120          * This routine gets only called when some pieces of information
1121          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1122          */
1123         if (!ic_proto_enabled) {
1124                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1125                 return -1;
1126         }
1127
1128 #ifdef IPCONFIG_BOOTP
1129         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1130                 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1131 #endif
1132 #ifdef IPCONFIG_RARP
1133         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1134                 printk(KERN_ERR "RARP: No suitable device found.\n");
1135 #endif
1136
1137         if (!ic_proto_have_if)
1138                 /* Error message already printed */
1139                 return -1;
1140
1141         /*
1142          * Setup protocols
1143          */
1144 #ifdef IPCONFIG_BOOTP
1145         if (do_bootp)
1146                 ic_bootp_init();
1147 #endif
1148 #ifdef IPCONFIG_RARP
1149         if (do_rarp)
1150                 ic_rarp_init();
1151 #endif
1152
1153         /*
1154          * Send requests and wait, until we get an answer. This loop
1155          * seems to be a terrible waste of CPU time, but actually there is
1156          * only one process running at all, so we don't need to use any
1157          * scheduler functions.
1158          * [Actually we could now, but the nothing else running note still
1159          *  applies.. - AC]
1160          */
1161         printk(KERN_NOTICE "Sending %s%s%s requests .",
1162                do_bootp
1163                 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1164                (do_bootp && do_rarp) ? " and " : "",
1165                do_rarp ? "RARP" : "");
1166
1167         start_jiffies = jiffies;
1168         d = ic_first_dev;
1169         retries = CONF_SEND_RETRIES;
1170         get_random_bytes(&timeout, sizeof(timeout));
1171         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1172         for (;;) {
1173                 /* Track the device we are configuring */
1174                 ic_dev_xid = d->xid;
1175
1176 #ifdef IPCONFIG_BOOTP
1177                 if (do_bootp && (d->able & IC_BOOTP))
1178                         ic_bootp_send_if(d, jiffies - start_jiffies);
1179 #endif
1180 #ifdef IPCONFIG_RARP
1181                 if (do_rarp && (d->able & IC_RARP))
1182                         ic_rarp_send_if(d);
1183 #endif
1184
1185                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1186                 while (time_before(jiffies, jiff) && !ic_got_reply)
1187                         schedule_timeout_uninterruptible(1);
1188 #ifdef IPCONFIG_DHCP
1189                 /* DHCP isn't done until we get a DHCPACK. */
1190                 if ((ic_got_reply & IC_BOOTP) &&
1191                     (ic_proto_enabled & IC_USE_DHCP) &&
1192                     ic_dhcp_msgtype != DHCPACK) {
1193                         ic_got_reply = 0;
1194                         printk(",");
1195                         continue;
1196                 }
1197 #endif /* IPCONFIG_DHCP */
1198
1199                 if (ic_got_reply) {
1200                         printk(" OK\n");
1201                         break;
1202                 }
1203
1204                 if ((d = d->next))
1205                         continue;
1206
1207                 if (! --retries) {
1208                         printk(" timed out!\n");
1209                         break;
1210                 }
1211
1212                 d = ic_first_dev;
1213
1214                 timeout = timeout CONF_TIMEOUT_MULT;
1215                 if (timeout > CONF_TIMEOUT_MAX)
1216                         timeout = CONF_TIMEOUT_MAX;
1217
1218                 printk(".");
1219         }
1220
1221 #ifdef IPCONFIG_BOOTP
1222         if (do_bootp)
1223                 ic_bootp_cleanup();
1224 #endif
1225 #ifdef IPCONFIG_RARP
1226         if (do_rarp)
1227                 ic_rarp_cleanup();
1228 #endif
1229
1230         if (!ic_got_reply) {
1231                 ic_myaddr = NONE;
1232                 return -1;
1233         }
1234
1235         printk("IP-Config: Got %s answer from %pI4, ",
1236                 ((ic_got_reply & IC_RARP) ? "RARP"
1237                  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1238                 &ic_servaddr);
1239         printk("my address is %pI4\n", &ic_myaddr);
1240
1241         return 0;
1242 }
1243
1244 #endif /* IPCONFIG_DYNAMIC */
1245
1246 #ifdef CONFIG_PROC_FS
1247
1248 static int pnp_seq_show(struct seq_file *seq, void *v)
1249 {
1250         int i;
1251
1252         if (ic_proto_used & IC_PROTO)
1253                 seq_printf(seq, "#PROTO: %s\n",
1254                            (ic_proto_used & IC_RARP) ? "RARP"
1255                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1256         else
1257                 seq_puts(seq, "#MANUAL\n");
1258
1259         if (ic_domain[0])
1260                 seq_printf(seq,
1261                            "domain %s\n", ic_domain);
1262         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1263                 if (ic_nameservers[i] != NONE)
1264                         seq_printf(seq, "nameserver %pI4\n",
1265                                    &ic_nameservers[i]);
1266         }
1267         if (ic_servaddr != NONE)
1268                 seq_printf(seq, "bootserver %pI4\n",
1269                            &ic_servaddr);
1270         return 0;
1271 }
1272
1273 static int pnp_seq_open(struct inode *indoe, struct file *file)
1274 {
1275         return single_open(file, pnp_seq_show, NULL);
1276 }
1277
1278 static const struct file_operations pnp_seq_fops = {
1279         .owner          = THIS_MODULE,
1280         .open           = pnp_seq_open,
1281         .read           = seq_read,
1282         .llseek         = seq_lseek,
1283         .release        = single_release,
1284 };
1285 #endif /* CONFIG_PROC_FS */
1286
1287 /*
1288  *  Extract IP address from the parameter string if needed. Note that we
1289  *  need to have root_server_addr set _before_ IPConfig gets called as it
1290  *  can override it.
1291  */
1292 __be32 __init root_nfs_parse_addr(char *name)
1293 {
1294         __be32 addr;
1295         int octets = 0;
1296         char *cp, *cq;
1297
1298         cp = cq = name;
1299         while (octets < 4) {
1300                 while (*cp >= '0' && *cp <= '9')
1301                         cp++;
1302                 if (cp == cq || cp - cq > 3)
1303                         break;
1304                 if (*cp == '.' || octets == 3)
1305                         octets++;
1306                 if (octets < 4)
1307                         cp++;
1308                 cq = cp;
1309         }
1310         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1311                 if (*cp == ':')
1312                         *cp++ = '\0';
1313                 addr = in_aton(name);
1314                 memmove(name, cp, strlen(cp) + 1);
1315         } else
1316                 addr = NONE;
1317
1318         return addr;
1319 }
1320
1321 #define DEVICE_WAIT_MAX         12 /* 12 seconds */
1322
1323 static int __init wait_for_devices(void)
1324 {
1325         int i;
1326
1327         msleep(CONF_PRE_OPEN);
1328         for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1329                 struct net_device *dev;
1330                 int found = 0;
1331
1332                 rtnl_lock();
1333                 for_each_netdev(&init_net, dev) {
1334                         if (ic_device_match(dev)) {
1335                                 found = 1;
1336                                 break;
1337                         }
1338                 }
1339                 rtnl_unlock();
1340                 if (found)
1341                         return 0;
1342                 ssleep(1);
1343         }
1344         return -ENODEV;
1345 }
1346
1347 /*
1348  *      IP Autoconfig dispatcher.
1349  */
1350
1351 static int __init ip_auto_config(void)
1352 {
1353         __be32 addr;
1354 #ifdef IPCONFIG_DYNAMIC
1355         int retries = CONF_OPEN_RETRIES;
1356 #endif
1357         int err;
1358
1359 #ifdef CONFIG_PROC_FS
1360         proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1361 #endif /* CONFIG_PROC_FS */
1362
1363         if (!ic_enable)
1364                 return 0;
1365
1366         DBG(("IP-Config: Entered.\n"));
1367 #ifdef IPCONFIG_DYNAMIC
1368  try_try_again:
1369 #endif
1370         /* Wait for devices to appear */
1371         err = wait_for_devices();
1372         if (err)
1373                 return err;
1374
1375         /* Setup all network devices */
1376         err = ic_open_devs();
1377         if (err)
1378                 return err;
1379
1380         /* Give drivers a chance to settle */
1381         ssleep(CONF_POST_OPEN);
1382
1383         /*
1384          * If the config information is insufficient (e.g., our IP address or
1385          * IP address of the boot server is missing or we have multiple network
1386          * interfaces and no default was set), use BOOTP or RARP to get the
1387          * missing values.
1388          */
1389         if (ic_myaddr == NONE ||
1390 #ifdef CONFIG_ROOT_NFS
1391             (root_server_addr == NONE &&
1392              ic_servaddr == NONE &&
1393              ROOT_DEV == Root_NFS) ||
1394 #endif
1395             ic_first_dev->next) {
1396 #ifdef IPCONFIG_DYNAMIC
1397                 if (ic_dynamic() < 0) {
1398                         ic_close_devs();
1399
1400                         /*
1401                          * I don't know why, but sometimes the
1402                          * eepro100 driver (at least) gets upset and
1403                          * doesn't work the first time it's opened.
1404                          * But then if you close it and reopen it, it
1405                          * works just fine.  So we need to try that at
1406                          * least once before giving up.
1407                          *
1408                          * Also, if the root will be NFS-mounted, we
1409                          * have nowhere to go if DHCP fails.  So we
1410                          * just have to keep trying forever.
1411                          *
1412                          *                              -- Chip
1413                          */
1414 #ifdef CONFIG_ROOT_NFS
1415                         if (ROOT_DEV ==  Root_NFS) {
1416                                 printk(KERN_ERR
1417                                         "IP-Config: Retrying forever (NFS root)...\n");
1418                                 goto try_try_again;
1419                         }
1420 #endif
1421
1422                         if (--retries) {
1423                                 printk(KERN_ERR
1424                                        "IP-Config: Reopening network devices...\n");
1425                                 goto try_try_again;
1426                         }
1427
1428                         /* Oh, well.  At least we tried. */
1429                         printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1430                         return -1;
1431                 }
1432 #else /* !DYNAMIC */
1433                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1434                 ic_close_devs();
1435                 return -1;
1436 #endif /* IPCONFIG_DYNAMIC */
1437         } else {
1438                 /* Device selected manually or only one device -> use it */
1439                 ic_dev = ic_first_dev->dev;
1440         }
1441
1442         addr = root_nfs_parse_addr(root_server_path);
1443         if (root_server_addr == NONE)
1444                 root_server_addr = addr;
1445
1446         /*
1447          * Use defaults whereever applicable.
1448          */
1449         if (ic_defaults() < 0)
1450                 return -1;
1451
1452         /*
1453          * Close all network devices except the device we've
1454          * autoconfigured and set up routes.
1455          */
1456         ic_close_devs();
1457         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1458                 return -1;
1459
1460         /*
1461          * Record which protocol was actually used.
1462          */
1463 #ifdef IPCONFIG_DYNAMIC
1464         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1465 #endif
1466
1467 #ifndef IPCONFIG_SILENT
1468         /*
1469          * Clue in the operator.
1470          */
1471         printk("IP-Config: Complete:");
1472         printk("\n     device=%s", ic_dev->name);
1473         printk(", addr=%pI4", &ic_myaddr);
1474         printk(", mask=%pI4", &ic_netmask);
1475         printk(", gw=%pI4", &ic_gateway);
1476         printk(",\n     host=%s, domain=%s, nis-domain=%s",
1477                utsname()->nodename, ic_domain, utsname()->domainname);
1478         printk(",\n     bootserver=%pI4", &ic_servaddr);
1479         printk(", rootserver=%pI4", &root_server_addr);
1480         printk(", rootpath=%s", root_server_path);
1481         if (ic_dev_mtu)
1482                 printk(", mtu=%d", ic_dev_mtu);
1483         printk("\n");
1484 #endif /* !SILENT */
1485
1486         return 0;
1487 }
1488
1489 late_initcall(ip_auto_config);
1490
1491
1492 /*
1493  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1494  *  command line parameter.  See Documentation/filesystems/nfs/nfsroot.txt.
1495  */
1496 static int __init ic_proto_name(char *name)
1497 {
1498         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1499                 return 1;
1500         }
1501         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1502                 return 0;
1503         }
1504 #ifdef CONFIG_IP_PNP_DHCP
1505         else if (!strcmp(name, "dhcp")) {
1506                 ic_proto_enabled &= ~IC_RARP;
1507                 return 1;
1508         }
1509 #endif
1510 #ifdef CONFIG_IP_PNP_BOOTP
1511         else if (!strcmp(name, "bootp")) {
1512                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1513                 return 1;
1514         }
1515 #endif
1516 #ifdef CONFIG_IP_PNP_RARP
1517         else if (!strcmp(name, "rarp")) {
1518                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1519                 return 1;
1520         }
1521 #endif
1522 #ifdef IPCONFIG_DYNAMIC
1523         else if (!strcmp(name, "both")) {
1524                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1525                 return 1;
1526         }
1527 #endif
1528         return 0;
1529 }
1530
1531 static int __init ip_auto_config_setup(char *addrs)
1532 {
1533         char *cp, *ip, *dp;
1534         int num = 0;
1535
1536         ic_set_manually = 1;
1537         ic_enable = 1;
1538
1539         /*
1540          * If any dhcp, bootp etc options are set, leave autoconfig on
1541          * and skip the below static IP processing.
1542          */
1543         if (ic_proto_name(addrs))
1544                 return 1;
1545
1546         /* If no static IP is given, turn off autoconfig and bail.  */
1547         if (*addrs == 0 ||
1548             strcmp(addrs, "off") == 0 ||
1549             strcmp(addrs, "none") == 0) {
1550                 ic_enable = 0;
1551                 return 1;
1552         }
1553
1554         /* Parse string for static IP assignment.  */
1555         ip = addrs;
1556         while (ip && *ip) {
1557                 if ((cp = strchr(ip, ':')))
1558                         *cp++ = '\0';
1559                 if (strlen(ip) > 0) {
1560                         DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1561                         switch (num) {
1562                         case 0:
1563                                 if ((ic_myaddr = in_aton(ip)) == ANY)
1564                                         ic_myaddr = NONE;
1565                                 break;
1566                         case 1:
1567                                 if ((ic_servaddr = in_aton(ip)) == ANY)
1568                                         ic_servaddr = NONE;
1569                                 break;
1570                         case 2:
1571                                 if ((ic_gateway = in_aton(ip)) == ANY)
1572                                         ic_gateway = NONE;
1573                                 break;
1574                         case 3:
1575                                 if ((ic_netmask = in_aton(ip)) == ANY)
1576                                         ic_netmask = NONE;
1577                                 break;
1578                         case 4:
1579                                 if ((dp = strchr(ip, '.'))) {
1580                                         *dp++ = '\0';
1581                                         strlcpy(utsname()->domainname, dp,
1582                                                 sizeof(utsname()->domainname));
1583                                 }
1584                                 strlcpy(utsname()->nodename, ip,
1585                                         sizeof(utsname()->nodename));
1586                                 ic_host_name_set = 1;
1587                                 break;
1588                         case 5:
1589                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1590                                 break;
1591                         case 6:
1592                                 if (ic_proto_name(ip) == 0 &&
1593                                     ic_myaddr == NONE) {
1594                                         ic_enable = 0;
1595                                 }
1596                                 break;
1597                         }
1598                 }
1599                 ip = cp;
1600                 num++;
1601         }
1602
1603         return 1;
1604 }
1605
1606 static int __init nfsaddrs_config_setup(char *addrs)
1607 {
1608         return ip_auto_config_setup(addrs);
1609 }
1610
1611 static int __init vendor_class_identifier_setup(char *addrs)
1612 {
1613         if (strlcpy(vendor_class_identifier, addrs,
1614                     sizeof(vendor_class_identifier))
1615             >= sizeof(vendor_class_identifier))
1616                 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1617                        vendor_class_identifier);
1618         return 1;
1619 }
1620
1621 __setup("ip=", ip_auto_config_setup);
1622 __setup("nfsaddrs=", nfsaddrs_config_setup);
1623 __setup("dhcpclass=", vendor_class_identifier_setup);