kernel/linux/net/ipv4/ipconfig.c

   1 /*
   2  *  $Id: ipconfig.c,v 1.46 2002/02/01 22:01:04 davem Exp $
   3  *
   4  *  Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
   5  *  user-supplied information to configure own IP address and routes.
   6  *
   7  *  Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
   8  *
   9  *  Derived from network configuration code in fs/nfs/nfsroot.c,
  10  *  originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
  11  *
  12  *  BOOTP rewritten to construct and analyse packets itself instead
  13  *  of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
  14  *                                           -- MJ, December 1998
  15  *
  16  *  Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
  17  *  initialization scheme.
  18  *      - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
  19  *
  20  *  DHCP support added.  To users this looks like a whole separate
  21  *  protocol, but we know it's just a bag on the side of BOOTP.
  22  *              -- Chip Salzenberg <chip@valinux.com>, May 2000
  23  *
  24  *  Ported DHCP support from 2.2.16 to 2.4.0-test4
  25  *              -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
  26  *
  27  *  Merged changes from 2.2.19 into 2.4.3
  28  *              -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
  29  *
  30  *  Multiple Nameservers in /proc/net/pnp
  31  *              --  Josef Siemes <jsiemes@web.de>, Aug 2002
  32  */
  33
  34 #include <linux/config.h>
  35 #include <linux/types.h>
  36 #include <linux/string.h>
  37 #include <linux/kernel.h>
  38 #include <linux/jiffies.h>
  39 #include <linux/random.h>
  40 #include <linux/init.h>
  41 #include <linux/utsname.h>
  42 #include <linux/in.h>
  43 #include <linux/if.h>
  44 #include <linux/inet.h>
  45 #include <linux/netdevice.h>
  46 #include <linux/if_arp.h>
  47 #include <linux/skbuff.h>
  48 #include <linux/ip.h>
  49 #include <linux/socket.h>
  50 #include <linux/route.h>
  51 #include <linux/udp.h>
  52 #include <linux/proc_fs.h>
  53 #include <linux/seq_file.h>
  54 #include <linux/major.h>
  55 #include <linux/root_dev.h>
  56 #include <net/arp.h>
  57 #include <net/ip.h>
  58 #include <net/ipconfig.h>
  59
  60 #include <asm/uaccess.h>
  61 #include <net/checksum.h>
  62 #include <asm/processor.h>
  63
  64 /* Define this to allow debugging output */
  65 #undef IPCONFIG_DEBUG
  66
  67 #ifdef IPCONFIG_DEBUG
  68 #define DBG(x) printk x
  69 #else
  70 #define DBG(x) do { } while(0)
  71 #endif
  72
  73 #if defined(CONFIG_IP_PNP_DHCP)
  74 #define IPCONFIG_DHCP
  75 #endif
  76 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
  77 #define IPCONFIG_BOOTP
  78 #endif
  79 #if defined(CONFIG_IP_PNP_RARP)
  80 #define IPCONFIG_RARP
  81 #endif
  82 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
  83 #define IPCONFIG_DYNAMIC
  84 #endif
  85
  86 /* Define the friendly delay before and after opening net devices */
  87 #define CONF_PRE_OPEN           (HZ/2)  /* Before opening: 1/2 second */
  88 #define CONF_POST_OPEN          (1*HZ)  /* After opening: 1 second */
  89
  90 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
  91 #define CONF_OPEN_RETRIES       2       /* (Re)open devices twice */
  92 #define CONF_SEND_RETRIES       6       /* Send six requests per open */
  93 #define CONF_INTER_TIMEOUT      (HZ/2)  /* Inter-device timeout: 1/2 second */
  94 #define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
  95 #define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
  96 #define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
  97 #define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
  98 #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
  99                                            - '3' from resolv.h */
 100
 101
 102 /*
 103  * Public IP configuration
 104  */
 105
 106 /* This is used by platforms which might be able to set the ipconfig
 107  * variables using firmware environment vars.  If this is set, it will
 108  * ignore such firmware variables.
 109  */
 110 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
 111
 112 int ic_enable __initdata = 0;                   /* IP config enabled? */
 113
 114 /* Protocol choice */
 115 int ic_proto_enabled __initdata = 0
 116 #ifdef IPCONFIG_BOOTP
 117                         | IC_BOOTP
 118 #endif
 119 #ifdef CONFIG_IP_PNP_DHCP
 120                         | IC_USE_DHCP
 121 #endif
 122 #ifdef IPCONFIG_RARP
 123                         | IC_RARP
 124 #endif
 125                         ;
 126
 127 int ic_host_name_set __initdata = 0;            /* Host name set by us? */
 128
 129 u32 ic_myaddr = INADDR_NONE;            /* My IP address */
 130 u32 ic_netmask = INADDR_NONE;   /* Netmask for local subnet */
 131 u32 ic_gateway = INADDR_NONE;   /* Gateway IP address */
 132
 133 u32 ic_servaddr = INADDR_NONE;  /* Boot server IP address */
 134
 135 u32 root_server_addr = INADDR_NONE;     /* Address of NFS server */
 136 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
 137
 138 /* Persistent data: */
 139
 140 int ic_proto_used;                      /* Protocol used, if any */
 141 u32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
 142 u8 ic_domain[64];               /* DNS (not NIS) domain name */
 143
 144 /*
 145  * Private state.
 146  */
 147
 148 /* Name of user-selected boot device */
 149 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
 150
 151 /* Protocols supported by available interfaces */
 152 static int ic_proto_have_if __initdata = 0;
 153
 154 #ifdef IPCONFIG_DYNAMIC
 155 static spinlock_t ic_recv_lock = SPIN_LOCK_UNLOCKED;
 156 static volatile int ic_got_reply __initdata = 0;    /* Proto(s) that replied */
 157 #endif
 158 #ifdef IPCONFIG_DHCP
 159 static int ic_dhcp_msgtype __initdata = 0;      /* DHCP msg type received */
 160 #endif
 161
 162
 163 /*
 164  *      Network devices
 165  */
 166
 167 struct ic_device {
 168         struct ic_device *next;
 169         struct net_device *dev;
 170         unsigned short flags;
 171         short able;
 172         u32 xid;
 173 };
 174
 175 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
 176 static struct net_device *ic_dev __initdata = NULL;     /* Selected device */
 177
 178 static int __init ic_open_devs(void)
 179 {
 180         struct ic_device *d, **last;
 181         struct net_device *dev;
 182         unsigned short oflags;
 183
 184         last = &ic_first_dev;
 185         rtnl_shlock();
 186
 187         /* bring loopback device up first */
 188         if (dev_change_flags(&loopback_dev, loopback_dev.flags | IFF_UP) < 0)
 189                 printk(KERN_ERR "IP-Config: Failed to open %s\n", loopback_dev.name);
 190
 191         for (dev = dev_base; dev; dev = dev->next) {
 192                 if (dev == &loopback_dev)
 193                         continue;
 194                 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
 195                     (!(dev->flags & IFF_LOOPBACK) &&
 196                      (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
 197                      strncmp(dev->name, "dummy", 5))) {
 198                         int able = 0;
 199                         if (dev->mtu >= 364)
 200                                 able |= IC_BOOTP;
 201                         else
 202                                 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
 203                         if (!(dev->flags & IFF_NOARP))
 204                                 able |= IC_RARP;
 205                         able &= ic_proto_enabled;
 206                         if (ic_proto_enabled && !able)
 207                                 continue;
 208                         oflags = dev->flags;
 209                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
 210                                 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
 211                                 continue;
 212                         }
 213                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
 214                                 rtnl_shunlock();
 215                                 return -1;
 216                         }
 217                         d->dev = dev;
 218                         *last = d;
 219                         last = &d->next;
 220                         d->flags = oflags;
 221                         d->able = able;
 222                         if (able & IC_BOOTP)
 223                                 get_random_bytes(&d->xid, sizeof(u32));
 224                         else
 225                                 d->xid = 0;
 226                         ic_proto_have_if |= able;
 227                         DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
 228                                 dev->name, able, d->xid));
 229                 }
 230         }
 231         rtnl_shunlock();
 232
 233         *last = NULL;
 234
 235         if (!ic_first_dev) {
 236                 if (user_dev_name[0])
 237                         printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
 238                 else
 239                         printk(KERN_ERR "IP-Config: No network devices available.\n");
 240                 return -1;
 241         }
 242         return 0;
 243 }
 244
 245 static void __init ic_close_devs(void)
 246 {
 247         struct ic_device *d, *next;
 248         struct net_device *dev;
 249
 250         rtnl_shlock();
 251         next = ic_first_dev;
 252         while ((d = next)) {
 253                 next = d->next;
 254                 dev = d->dev;
 255                 if (dev != ic_dev) {
 256                         DBG(("IP-Config: Downing %s\n", dev->name));
 257                         dev_change_flags(dev, d->flags);
 258                 }
 259                 kfree(d);
 260         }
 261         rtnl_shunlock();
 262 }
 263
 264 /*
 265  *      Interface to various network functions.
 266  */
 267
 268 static inline void
 269 set_sockaddr(struct sockaddr_in *sin, u32 addr, u16 port)
 270 {
 271         sin->sin_family = AF_INET;
 272         sin->sin_addr.s_addr = addr;
 273         sin->sin_port = port;
 274 }
 275
 276 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
 277 {
 278         int res;
 279
 280         mm_segment_t oldfs = get_fs();
 281         set_fs(get_ds());
 282         res = devinet_ioctl(cmd, (struct ifreq __user *) arg);
 283         set_fs(oldfs);
 284         return res;
 285 }
 286
 287 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
 288 {
 289         int res;
 290
 291         mm_segment_t oldfs = get_fs();
 292         set_fs(get_ds());
 293         res = ip_rt_ioctl(cmd, (void __user *) arg);
 294         set_fs(oldfs);
 295         return res;
 296 }
 297
 298 /*
 299  *      Set up interface addresses and routes.
 300  */
 301
 302 static int __init ic_setup_if(void)
 303 {
 304         struct ifreq ir;
 305         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
 306         int err;
 307
 308         memset(&ir, 0, sizeof(ir));
 309         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
 310         set_sockaddr(sin, ic_myaddr, 0);
 311         if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
 312                 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
 313                 return -1;
 314         }
 315         set_sockaddr(sin, ic_netmask, 0);
 316         if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
 317                 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
 318                 return -1;
 319         }
 320         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
 321         if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
 322                 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
 323                 return -1;
 324         }
 325         return 0;
 326 }
 327
 328 static int __init ic_setup_routes(void)
 329 {
 330         /* No need to setup device routes, only the default route... */
 331
 332         if (ic_gateway != INADDR_NONE) {
 333                 struct rtentry rm;
 334                 int err;
 335
 336                 memset(&rm, 0, sizeof(rm));
 337                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
 338                         printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
 339                         return -1;
 340                 }
 341                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
 342                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
 343                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
 344                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
 345                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
 346                         printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
 347                         return -1;
 348                 }
 349         }
 350
 351         return 0;
 352 }
 353
 354 /*
 355  *      Fill in default values for all missing parameters.
 356  */
 357
 358 static int __init ic_defaults(void)
 359 {
 360         /*
 361          *      At this point we have no userspace running so need not
 362          *      claim locks on system_utsname
 363          */
 364
 365         if (!ic_host_name_set)
 366                 sprintf(system_utsname.nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr));
 367
 368         if (root_server_addr == INADDR_NONE)
 369                 root_server_addr = ic_servaddr;
 370
 371         if (ic_netmask == INADDR_NONE) {
 372                 if (IN_CLASSA(ntohl(ic_myaddr)))
 373                         ic_netmask = htonl(IN_CLASSA_NET);
 374                 else if (IN_CLASSB(ntohl(ic_myaddr)))
 375                         ic_netmask = htonl(IN_CLASSB_NET);
 376                 else if (IN_CLASSC(ntohl(ic_myaddr)))
 377                         ic_netmask = htonl(IN_CLASSC_NET);
 378                 else {
 379                         printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n",
 380                                 NIPQUAD(ic_myaddr));
 381                         return -1;
 382                 }
 383                 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask));
 384         }
 385
 386         return 0;
 387 }
 388
 389 /*
 390  *      RARP support.
 391  */
 392
 393 #ifdef IPCONFIG_RARP
 394
 395 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt);
 396
 397 static struct packet_type rarp_packet_type __initdata = {
 398         .type = __constant_htons(ETH_P_RARP),
 399         .func = ic_rarp_recv,
 400 };
 401
 402 static inline void ic_rarp_init(void)
 403 {
 404         dev_add_pack(&rarp_packet_type);
 405 }
 406
 407 static inline void ic_rarp_cleanup(void)
 408 {
 409         dev_remove_pack(&rarp_packet_type);
 410 }
 411
 412 /*
 413  *  Process received RARP packet.
 414  */
 415 static int __init
 416 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
 417 {
 418         struct arphdr *rarp;
 419         unsigned char *rarp_ptr;
 420         unsigned long sip, tip;
 421         unsigned char *sha, *tha;               /* s for "source", t for "target" */
 422         struct ic_device *d;
 423
 424         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 425                 return NET_RX_DROP;
 426
 427         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
 428                 goto drop;
 429
 430         /* Basic sanity checks can be done without the lock.  */
 431         rarp = (struct arphdr *)skb->h.raw;
 432
 433         /* If this test doesn't pass, it's not IP, or we should
 434          * ignore it anyway.
 435          */
 436         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
 437                 goto drop;
 438
 439         /* If it's not a RARP reply, delete it. */
 440         if (rarp->ar_op != htons(ARPOP_RREPLY))
 441                 goto drop;
 442
 443         /* If it's not Ethernet, delete it. */
 444         if (rarp->ar_pro != htons(ETH_P_IP))
 445                 goto drop;
 446
 447         if (!pskb_may_pull(skb,
 448                            sizeof(struct arphdr) +
 449                            (2 * dev->addr_len) +
 450                            (2 * 4)))
 451                 goto drop;
 452
 453         /* OK, it is all there and looks valid, process... */
 454         rarp = (struct arphdr *)skb->h.raw;
 455         rarp_ptr = (unsigned char *) (rarp + 1);
 456
 457         /* One reply at a time, please. */
 458         spin_lock(&ic_recv_lock);
 459
 460         /* If we already have a reply, just drop the packet */
 461         if (ic_got_reply)
 462                 goto drop_unlock;
 463
 464         /* Find the ic_device that the packet arrived on */
 465         d = ic_first_dev;
 466         while (d && d->dev != dev)
 467                 d = d->next;
 468         if (!d)
 469                 goto drop_unlock;       /* should never happen */
 470
 471         /* Extract variable-width fields */
 472         sha = rarp_ptr;
 473         rarp_ptr += dev->addr_len;
 474         memcpy(&sip, rarp_ptr, 4);
 475         rarp_ptr += 4;
 476         tha = rarp_ptr;
 477         rarp_ptr += dev->addr_len;
 478         memcpy(&tip, rarp_ptr, 4);
 479
 480         /* Discard packets which are not meant for us. */
 481         if (memcmp(tha, dev->dev_addr, dev->addr_len))
 482                 goto drop_unlock;
 483
 484         /* Discard packets which are not from specified server. */
 485         if (ic_servaddr != INADDR_NONE && ic_servaddr != sip)
 486                 goto drop_unlock;
 487
 488         /* We have a winner! */
 489         ic_dev = dev;
 490         if (ic_myaddr == INADDR_NONE)
 491                 ic_myaddr = tip;
 492         ic_servaddr = sip;
 493         ic_got_reply = IC_RARP;
 494
 495 drop_unlock:
 496         /* Show's over.  Nothing to see here.  */
 497         spin_unlock(&ic_recv_lock);
 498
 499 drop:
 500         /* Throw the packet out. */
 501         kfree_skb(skb);
 502         return 0;
 503 }
 504
 505
 506 /*
 507  *  Send RARP request packet over a single interface.
 508  */
 509 static void __init ic_rarp_send_if(struct ic_device *d)
 510 {
 511         struct net_device *dev = d->dev;
 512         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
 513                  dev->dev_addr, dev->dev_addr);
 514 }
 515 #endif
 516
 517 /*
 518  *      DHCP/BOOTP support.
 519  */
 520
 521 #ifdef IPCONFIG_BOOTP
 522
 523 struct bootp_pkt {              /* BOOTP packet format */
 524         struct iphdr iph;       /* IP header */
 525         struct udphdr udph;     /* UDP header */
 526         u8 op;                  /* 1=request, 2=reply */
 527         u8 htype;               /* HW address type */
 528         u8 hlen;                /* HW address length */
 529         u8 hops;                /* Used only by gateways */
 530         u32 xid;                /* Transaction ID */
 531         u16 secs;               /* Seconds since we started */
 532         u16 flags;              /* Just what it says */
 533         u32 client_ip;          /* Client's IP address if known */
 534         u32 your_ip;            /* Assigned IP address */
 535         u32 server_ip;          /* (Next, e.g. NFS) Server's IP address */
 536         u32 relay_ip;           /* IP address of BOOTP relay */
 537         u8 hw_addr[16];         /* Client's HW address */
 538         u8 serv_name[64];       /* Server host name */
 539         u8 boot_file[128];      /* Name of boot file */
 540         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
 541 };
 542
 543 /* packet ops */
 544 #define BOOTP_REQUEST   1
 545 #define BOOTP_REPLY     2
 546
 547 /* DHCP message types */
 548 #define DHCPDISCOVER    1
 549 #define DHCPOFFER       2
 550 #define DHCPREQUEST     3
 551 #define DHCPDECLINE     4
 552 #define DHCPACK         5
 553 #define DHCPNAK         6
 554 #define DHCPRELEASE     7
 555 #define DHCPINFORM      8
 556
 557 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt);
 558
 559 static struct packet_type bootp_packet_type __initdata = {
 560         .type = __constant_htons(ETH_P_IP),
 561         .func = ic_bootp_recv,
 562 };
 563
 564
 565 /*
 566  *  Initialize DHCP/BOOTP extension fields in the request.
 567  */
 568
 569 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
 570
 571 #ifdef IPCONFIG_DHCP
 572
 573 static void __init
 574 ic_dhcp_init_options(u8 *options)
 575 {
 576         u8 mt = ((ic_servaddr == INADDR_NONE)
 577                  ? DHCPDISCOVER : DHCPREQUEST);
 578         u8 *e = options;
 579
 580 #ifdef IPCONFIG_DEBUG
 581         printk("DHCP: Sending message type %d\n", mt);
 582 #endif
 583
 584         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 585         e += 4;
 586
 587         *e++ = 53;              /* DHCP message type */
 588         *e++ = 1;
 589         *e++ = mt;
 590
 591         if (mt == DHCPREQUEST) {
 592                 *e++ = 54;      /* Server ID (IP address) */
 593                 *e++ = 4;
 594                 memcpy(e, &ic_servaddr, 4);
 595                 e += 4;
 596
 597                 *e++ = 50;      /* Requested IP address */
 598                 *e++ = 4;
 599                 memcpy(e, &ic_myaddr, 4);
 600                 e += 4;
 601         }
 602
 603         /* always? */
 604         {
 605                 static const u8 ic_req_params[] = {
 606                         1,      /* Subnet mask */
 607                         3,      /* Default gateway */
 608                         6,      /* DNS server */
 609                         12,     /* Host name */
 610                         15,     /* Domain name */
 611                         17,     /* Boot path */
 612                         40,     /* NIS domain name */
 613                 };
 614
 615                 *e++ = 55;      /* Parameter request list */
 616                 *e++ = sizeof(ic_req_params);
 617                 memcpy(e, ic_req_params, sizeof(ic_req_params));
 618                 e += sizeof(ic_req_params);
 619         }
 620
 621         *e++ = 255;     /* End of the list */
 622 }
 623
 624 #endif /* IPCONFIG_DHCP */
 625
 626 static void __init ic_bootp_init_ext(u8 *e)
 627 {
 628         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 629         e += 4;
 630         *e++ = 1;               /* Subnet mask request */
 631         *e++ = 4;
 632         e += 4;
 633         *e++ = 3;               /* Default gateway request */
 634         *e++ = 4;
 635         e += 4;
 636         *e++ = 5;               /* Name server request */
 637         *e++ = 8;
 638         e += 8;
 639         *e++ = 12;              /* Host name request */
 640         *e++ = 32;
 641         e += 32;
 642         *e++ = 40;              /* NIS Domain name request */
 643         *e++ = 32;
 644         e += 32;
 645         *e++ = 17;              /* Boot path */
 646         *e++ = 40;
 647         e += 40;
 648
 649         *e++ = 57;              /* set extension buffer size for reply */
 650         *e++ = 2;
 651         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
 652         *e++ = 150;
 653
 654         *e++ = 255;             /* End of the list */
 655 }
 656
 657
 658 /*
 659  *  Initialize the DHCP/BOOTP mechanism.
 660  */
 661 static inline void ic_bootp_init(void)
 662 {
 663         int i;
 664
 665         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
 666                 ic_nameservers[i] = INADDR_NONE;
 667
 668         dev_add_pack(&bootp_packet_type);
 669 }
 670
 671
 672 /*
 673  *  DHCP/BOOTP cleanup.
 674  */
 675 static inline void ic_bootp_cleanup(void)
 676 {
 677         dev_remove_pack(&bootp_packet_type);
 678 }
 679
 680
 681 /*
 682  *  Send DHCP/BOOTP request to single interface.
 683  */
 684 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
 685 {
 686         struct net_device *dev = d->dev;
 687         struct sk_buff *skb;
 688         struct bootp_pkt *b;
 689         int hh_len = LL_RESERVED_SPACE(dev);
 690         struct iphdr *h;
 691
 692         /* Allocate packet */
 693         skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
 694         if (!skb)
 695                 return;
 696         skb_reserve(skb, hh_len);
 697         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
 698         memset(b, 0, sizeof(struct bootp_pkt));
 699
 700         /* Construct IP header */
 701         skb->nh.iph = h = &b->iph;
 702         h->version = 4;
 703         h->ihl = 5;
 704         h->tot_len = htons(sizeof(struct bootp_pkt));
 705         h->frag_off = htons(IP_DF);
 706         h->ttl = 64;
 707         h->protocol = IPPROTO_UDP;
 708         h->daddr = INADDR_BROADCAST;
 709         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
 710
 711         /* Construct UDP header */
 712         b->udph.source = htons(68);
 713         b->udph.dest = htons(67);
 714         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
 715         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
 716
 717         /* Construct DHCP/BOOTP header */
 718         b->op = BOOTP_REQUEST;
 719         if (dev->type < 256) /* check for false types */
 720                 b->htype = dev->type;
 721         else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
 722                 b->htype = ARPHRD_IEEE802;
 723         else {
 724                 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
 725                 b->htype = dev->type; /* can cause undefined behavior */
 726         }
 727         b->hlen = dev->addr_len;
 728         b->your_ip = INADDR_NONE;
 729         b->server_ip = INADDR_NONE;
 730         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
 731         b->secs = htons(jiffies_diff / HZ);
 732         b->xid = d->xid;
 733
 734         /* add DHCP options or BOOTP extensions */
 735 #ifdef IPCONFIG_DHCP
 736         if (ic_proto_enabled & IC_USE_DHCP)
 737                 ic_dhcp_init_options(b->exten);
 738         else
 739 #endif
 740                 ic_bootp_init_ext(b->exten);
 741
 742         /* Chain packet down the line... */
 743         skb->dev = dev;
 744         skb->protocol = htons(ETH_P_IP);
 745         if ((dev->hard_header &&
 746              dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) ||
 747             dev_queue_xmit(skb) < 0)
 748                 printk("E");
 749 }
 750
 751
 752 /*
 753  *  Copy BOOTP-supplied string if not already set.
 754  */
 755 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
 756 {
 757         if (!len)
 758                 return 0;
 759         if (len > max-1)
 760                 len = max-1;
 761         memcpy(dest, src, len);
 762         dest[len] = '\0';
 763         return 1;
 764 }
 765
 766
 767 /*
 768  *  Process BOOTP extensions.
 769  */
 770 static void __init ic_do_bootp_ext(u8 *ext)
 771 {
 772        u8 servers;
 773        int i;
 774
 775 #ifdef IPCONFIG_DEBUG
 776         u8 *c;
 777
 778         printk("DHCP/BOOTP: Got extension %d:",*ext);
 779         for(c=ext+2; c<ext+2+ext[1]; c++)
 780                 printk(" %02x", *c);
 781         printk("\n");
 782 #endif
 783
 784         switch (*ext++) {
 785                 case 1:         /* Subnet mask */
 786                         if (ic_netmask == INADDR_NONE)
 787                                 memcpy(&ic_netmask, ext+1, 4);
 788                         break;
 789                 case 3:         /* Default gateway */
 790                         if (ic_gateway == INADDR_NONE)
 791                                 memcpy(&ic_gateway, ext+1, 4);
 792                         break;
 793                 case 6:         /* DNS server */
 794                         servers= *ext/4;
 795                         if (servers > CONF_NAMESERVERS_MAX)
 796                                 servers = CONF_NAMESERVERS_MAX;
 797                         for (i = 0; i < servers; i++) {
 798                                 if (ic_nameservers[i] == INADDR_NONE)
 799                                         memcpy(&ic_nameservers[i], ext+1+4*i, 4);
 800                         }
 801                         break;
 802                 case 12:        /* Host name */
 803                         ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN);
 804                         ic_host_name_set = 1;
 805                         break;
 806                 case 15:        /* Domain name (DNS) */
 807                         ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
 808                         break;
 809                 case 17:        /* Root path */
 810                         if (!root_server_path[0])
 811                                 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
 812                         break;
 813                 case 40:        /* NIS Domain name (_not_ DNS) */
 814                         ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN);
 815                         break;
 816         }
 817 }
 818
 819
 820 /*
 821  *  Receive BOOTP reply.
 822  */
 823 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
 824 {
 825         struct bootp_pkt *b;
 826         struct iphdr *h;
 827         struct ic_device *d;
 828         int len, ext_len;
 829
 830         /* Perform verifications before taking the lock.  */
 831         if (skb->pkt_type == PACKET_OTHERHOST)
 832                 goto drop;
 833
 834         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 835                 return NET_RX_DROP;
 836
 837         if (!pskb_may_pull(skb,
 838                            sizeof(struct iphdr) +
 839                            sizeof(struct udphdr)))
 840                 goto drop;
 841
 842         b = (struct bootp_pkt *) skb->nh.iph;
 843         h = &b->iph;
 844
 845         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
 846                 goto drop;
 847
 848         /* Fragments are not supported */
 849         if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
 850                 if (net_ratelimit())
 851                         printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
 852                                "reply.\n");
 853                 goto drop;
 854         }
 855
 856         if (skb->len < ntohs(h->tot_len))
 857                 goto drop;
 858
 859         if (ip_fast_csum((char *) h, h->ihl))
 860                 goto drop;
 861
 862         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
 863                 goto drop;
 864
 865         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
 866                 goto drop;
 867
 868         len = ntohs(b->udph.len) - sizeof(struct udphdr);
 869         ext_len = len - (sizeof(*b) -
 870                          sizeof(struct iphdr) -
 871                          sizeof(struct udphdr) -
 872                          sizeof(b->exten));
 873         if (ext_len < 0)
 874                 goto drop;
 875
 876         /* Ok the front looks good, make sure we can get at the rest.  */
 877         if (!pskb_may_pull(skb, skb->len))
 878                 goto drop;
 879
 880         b = (struct bootp_pkt *) skb->nh.iph;
 881         h = &b->iph;
 882
 883         /* One reply at a time, please. */
 884         spin_lock(&ic_recv_lock);
 885
 886         /* If we already have a reply, just drop the packet */
 887         if (ic_got_reply)
 888                 goto drop_unlock;
 889
 890         /* Find the ic_device that the packet arrived on */
 891         d = ic_first_dev;
 892         while (d && d->dev != dev)
 893                 d = d->next;
 894         if (!d)
 895                 goto drop_unlock;  /* should never happen */
 896
 897         /* Is it a reply to our BOOTP request? */
 898         if (b->op != BOOTP_REPLY ||
 899             b->xid != d->xid) {
 900                 if (net_ratelimit())
 901                         printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
 902                                "op[%x] xid[%x]\n",
 903                                b->op, b->xid);
 904                 goto drop_unlock;
 905         }
 906
 907         /* Parse extensions */
 908         if (ext_len >= 4 &&
 909             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
 910                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
 911                 u8 *ext;
 912
 913 #ifdef IPCONFIG_DHCP
 914                 if (ic_proto_enabled & IC_USE_DHCP) {
 915                         u32 server_id = INADDR_NONE;
 916                         int mt = 0;
 917
 918                         ext = &b->exten[4];
 919                         while (ext < end && *ext != 0xff) {
 920                                 u8 *opt = ext++;
 921                                 if (*opt == 0)  /* Padding */
 922                                         continue;
 923                                 ext += *ext + 1;
 924                                 if (ext >= end)
 925                                         break;
 926                                 switch (*opt) {
 927                                 case 53:        /* Message type */
 928                                         if (opt[1])
 929                                                 mt = opt[2];
 930                                         break;
 931                                 case 54:        /* Server ID (IP address) */
 932                                         if (opt[1] >= 4)
 933                                                 memcpy(&server_id, opt + 2, 4);
 934                                         break;
 935                                 };
 936                         }
 937
 938 #ifdef IPCONFIG_DEBUG
 939                         printk("DHCP: Got message type %d\n", mt);
 940 #endif
 941
 942                         switch (mt) {
 943                         case DHCPOFFER:
 944                                 /* While in the process of accepting one offer,
 945                                  * ignore all others.
 946                                  */
 947                                 if (ic_myaddr != INADDR_NONE)
 948                                         goto drop_unlock;
 949
 950                                 /* Let's accept that offer. */
 951                                 ic_myaddr = b->your_ip;
 952                                 ic_servaddr = server_id;
 953 #ifdef IPCONFIG_DEBUG
 954                                 printk("DHCP: Offered address %u.%u.%u.%u",
 955                                        NIPQUAD(ic_myaddr));
 956                                 printk(" by server %u.%u.%u.%u\n",
 957                                        NIPQUAD(ic_servaddr));
 958 #endif
 959                                 /* The DHCP indicated server address takes
 960                                  * precedence over the bootp header one if
 961                                  * they are different.
 962                                  */
 963                                 if ((server_id != INADDR_NONE) &&
 964                                     (b->server_ip != server_id))
 965                                         b->server_ip = ic_servaddr;
 966                                 break;
 967
 968                         case DHCPACK:
 969                                 /* Yeah! */
 970                                 break;
 971
 972                         default:
 973                                 /* Urque.  Forget it*/
 974                                 ic_myaddr = INADDR_NONE;
 975                                 ic_servaddr = INADDR_NONE;
 976                                 goto drop_unlock;
 977                         };
 978
 979                         ic_dhcp_msgtype = mt;
 980
 981                 }
 982 #endif /* IPCONFIG_DHCP */
 983
 984                 ext = &b->exten[4];
 985                 while (ext < end && *ext != 0xff) {
 986                         u8 *opt = ext++;
 987                         if (*opt == 0)  /* Padding */
 988                                 continue;
 989                         ext += *ext + 1;
 990                         if (ext < end)
 991                                 ic_do_bootp_ext(opt);
 992                 }
 993         }
 994
 995         /* We have a winner! */
 996         ic_dev = dev;
 997         ic_myaddr = b->your_ip;
 998         ic_servaddr = b->server_ip;
 999         if (ic_gateway == INADDR_NONE && b->relay_ip)
1000                 ic_gateway = b->relay_ip;
1001         if (ic_nameservers[0] == INADDR_NONE)
1002                 ic_nameservers[0] = ic_servaddr;
1003         ic_got_reply = IC_BOOTP;
1004
1005 drop_unlock:
1006         /* Show's over.  Nothing to see here.  */
1007         spin_unlock(&ic_recv_lock);
1008
1009 drop:
1010         /* Throw the packet out. */
1011         kfree_skb(skb);
1012
1013         return 0;
1014 }
1015
1016
1017 #endif
1018
1019
1020 /*
1021  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1022  */
1023
1024 #ifdef IPCONFIG_DYNAMIC
1025
1026 static int __init ic_dynamic(void)
1027 {
1028         int retries;
1029         struct ic_device *d;
1030         unsigned long start_jiffies, timeout, jiff;
1031         int do_bootp = ic_proto_have_if & IC_BOOTP;
1032         int do_rarp = ic_proto_have_if & IC_RARP;
1033
1034         /*
1035          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1036          * This routine gets only called when some pieces of information
1037          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1038          */
1039         if (!ic_proto_enabled) {
1040                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1041                 return -1;
1042         }
1043
1044 #ifdef IPCONFIG_BOOTP
1045         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1046                 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1047 #endif
1048 #ifdef IPCONFIG_RARP
1049         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1050                 printk(KERN_ERR "RARP: No suitable device found.\n");
1051 #endif
1052
1053         if (!ic_proto_have_if)
1054                 /* Error message already printed */
1055                 return -1;
1056
1057         /*
1058          * Setup protocols
1059          */
1060 #ifdef IPCONFIG_BOOTP
1061         if (do_bootp)
1062                 ic_bootp_init();
1063 #endif
1064 #ifdef IPCONFIG_RARP
1065         if (do_rarp)
1066                 ic_rarp_init();
1067 #endif
1068
1069         /*
1070          * Send requests and wait, until we get an answer. This loop
1071          * seems to be a terrible waste of CPU time, but actually there is
1072          * only one process running at all, so we don't need to use any
1073          * scheduler functions.
1074          * [Actually we could now, but the nothing else running note still
1075          *  applies.. - AC]
1076          */
1077         printk(KERN_NOTICE "Sending %s%s%s requests .",
1078                do_bootp
1079                 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1080                (do_bootp && do_rarp) ? " and " : "",
1081                do_rarp ? "RARP" : "");
1082
1083         start_jiffies = jiffies;
1084         d = ic_first_dev;
1085         retries = CONF_SEND_RETRIES;
1086         get_random_bytes(&timeout, sizeof(timeout));
1087         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1088         for(;;) {
1089 #ifdef IPCONFIG_BOOTP
1090                 if (do_bootp && (d->able & IC_BOOTP))
1091                         ic_bootp_send_if(d, jiffies - start_jiffies);
1092 #endif
1093 #ifdef IPCONFIG_RARP
1094                 if (do_rarp && (d->able & IC_RARP))
1095                         ic_rarp_send_if(d);
1096 #endif
1097
1098                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1099                 while (time_before(jiffies, jiff) && !ic_got_reply) {
1100                         barrier();
1101                         cpu_relax();
1102                 }
1103 #ifdef IPCONFIG_DHCP
1104                 /* DHCP isn't done until we get a DHCPACK. */
1105                 if ((ic_got_reply & IC_BOOTP)
1106                     && (ic_proto_enabled & IC_USE_DHCP)
1107                     && ic_dhcp_msgtype != DHCPACK)
1108                 {
1109                         ic_got_reply = 0;
1110                         printk(",");
1111                         continue;
1112                 }
1113 #endif /* IPCONFIG_DHCP */
1114
1115                 if (ic_got_reply) {
1116                         printk(" OK\n");
1117                         break;
1118                 }
1119
1120                 if ((d = d->next))
1121                         continue;
1122
1123                 if (! --retries) {
1124                         printk(" timed out!\n");
1125                         break;
1126                 }
1127
1128                 d = ic_first_dev;
1129
1130                 timeout = timeout CONF_TIMEOUT_MULT;
1131                 if (timeout > CONF_TIMEOUT_MAX)
1132                         timeout = CONF_TIMEOUT_MAX;
1133
1134                 printk(".");
1135         }
1136
1137 #ifdef IPCONFIG_BOOTP
1138         if (do_bootp)
1139                 ic_bootp_cleanup();
1140 #endif
1141 #ifdef IPCONFIG_RARP
1142         if (do_rarp)
1143                 ic_rarp_cleanup();
1144 #endif
1145
1146         if (!ic_got_reply)
1147                 return -1;
1148
1149         printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
1150                 ((ic_got_reply & IC_RARP) ? "RARP"
1151                  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1152                 NIPQUAD(ic_servaddr));
1153         printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
1154
1155         return 0;
1156 }
1157
1158 #endif /* IPCONFIG_DYNAMIC */
1159
1160 #ifdef CONFIG_PROC_FS
1161
1162 static int pnp_seq_show(struct seq_file *seq, void *v)
1163 {
1164         int i;
1165
1166         if (ic_proto_used & IC_PROTO)
1167                 seq_printf(seq, "#PROTO: %s\n",
1168                            (ic_proto_used & IC_RARP) ? "RARP"
1169                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1170         else
1171                 seq_puts(seq, "#MANUAL\n");
1172
1173         if (ic_domain[0])
1174                 seq_printf(seq,
1175                            "domain %s\n", ic_domain);
1176         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1177                 if (ic_nameservers[i] != INADDR_NONE)
1178                         seq_printf(seq,
1179                                    "nameserver %u.%u.%u.%u\n",
1180                                    NIPQUAD(ic_nameservers[i]));
1181         }
1182         if (ic_servaddr != INADDR_NONE)
1183                 seq_printf(seq,
1184                            "bootserver %u.%u.%u.%u\n",
1185                            NIPQUAD(ic_servaddr));
1186         return 0;
1187 }
1188
1189 static int pnp_seq_open(struct inode *indoe, struct file *file)
1190 {
1191         return single_open(file, pnp_seq_show, NULL);
1192 }
1193
1194 static struct file_operations pnp_seq_fops = {
1195         .owner          = THIS_MODULE,
1196         .open           = pnp_seq_open,
1197         .read           = seq_read,
1198         .llseek         = seq_lseek,
1199         .release        = single_release,
1200 };
1201 #endif /* CONFIG_PROC_FS */
1202
1203 /*
1204  *  Extract IP address from the parameter string if needed. Note that we
1205  *  need to have root_server_addr set _before_ IPConfig gets called as it
1206  *  can override it.
1207  */
1208 u32 __init root_nfs_parse_addr(char *name)
1209 {
1210         u32 addr;
1211         int octets = 0;
1212         char *cp, *cq;
1213
1214         cp = cq = name;
1215         while (octets < 4) {
1216                 while (*cp >= '0' && *cp <= '9')
1217                         cp++;
1218                 if (cp == cq || cp - cq > 3)
1219                         break;
1220                 if (*cp == '.' || octets == 3)
1221                         octets++;
1222                 if (octets < 4)
1223                         cp++;
1224                 cq = cp;
1225         }
1226         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1227                 if (*cp == ':')
1228                         *cp++ = '\0';
1229                 addr = in_aton(name);
1230                 strcpy(name, cp);
1231         } else
1232                 addr = INADDR_NONE;
1233
1234         return addr;
1235 }
1236
1237 /*
1238  *      IP Autoconfig dispatcher.
1239  */
1240
1241 static int __init ip_auto_config(void)
1242 {
1243         unsigned long jiff;
1244         u32 addr;
1245
1246 #ifdef CONFIG_PROC_FS
1247         proc_net_fops_create("pnp", S_IRUGO, &pnp_seq_fops);
1248 #endif /* CONFIG_PROC_FS */
1249
1250         if (!ic_enable)
1251                 return 0;
1252
1253         DBG(("IP-Config: Entered.\n"));
1254 #ifdef IPCONFIG_DYNAMIC
1255  try_try_again:
1256 #endif
1257         /* Give hardware a chance to settle */
1258         jiff = jiffies + CONF_PRE_OPEN;
1259         while (time_before(jiffies, jiff))
1260                 cpu_relax();
1261
1262         /* Setup all network devices */
1263         if (ic_open_devs() < 0)
1264                 return -1;
1265
1266         /* Give drivers a chance to settle */
1267         jiff = jiffies + CONF_POST_OPEN;
1268         while (time_before(jiffies, jiff))
1269                 cpu_relax();
1270
1271         /*
1272          * If the config information is insufficient (e.g., our IP address or
1273          * IP address of the boot server is missing or we have multiple network
1274          * interfaces and no default was set), use BOOTP or RARP to get the
1275          * missing values.
1276          */
1277         if (ic_myaddr == INADDR_NONE ||
1278 #ifdef CONFIG_ROOT_NFS
1279             (MAJOR(ROOT_DEV) == UNNAMED_MAJOR
1280              && root_server_addr == INADDR_NONE
1281              && ic_servaddr == INADDR_NONE) ||
1282 #endif
1283             ic_first_dev->next) {
1284 #ifdef IPCONFIG_DYNAMIC
1285
1286                 int retries = CONF_OPEN_RETRIES;
1287
1288                 if (ic_dynamic() < 0) {
1289                         ic_close_devs();
1290
1291                         /*
1292                          * I don't know why, but sometimes the
1293                          * eepro100 driver (at least) gets upset and
1294                          * doesn't work the first time it's opened.
1295                          * But then if you close it and reopen it, it
1296                          * works just fine.  So we need to try that at
1297                          * least once before giving up.
1298                          *
1299                          * Also, if the root will be NFS-mounted, we
1300                          * have nowhere to go if DHCP fails.  So we
1301                          * just have to keep trying forever.
1302                          *
1303                          *                              -- Chip
1304                          */
1305 #ifdef CONFIG_ROOT_NFS
1306                         if (ROOT_DEV ==  Root_NFS) {
1307                                 printk(KERN_ERR
1308                                         "IP-Config: Retrying forever (NFS root)...\n");
1309                                 goto try_try_again;
1310                         }
1311 #endif
1312
1313                         if (--retries) {
1314                                 printk(KERN_ERR
1315                                        "IP-Config: Reopening network devices...\n");
1316                                 goto try_try_again;
1317                         }
1318
1319                         /* Oh, well.  At least we tried. */
1320                         printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1321                         return -1;
1322                 }
1323 #else /* !DYNAMIC */
1324                 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1325                 ic_close_devs();
1326                 return -1;
1327 #endif /* IPCONFIG_DYNAMIC */
1328         } else {
1329                 /* Device selected manually or only one device -> use it */
1330                 ic_dev = ic_first_dev->dev;
1331         }
1332
1333         addr = root_nfs_parse_addr(root_server_path);
1334         if (root_server_addr == INADDR_NONE)
1335                 root_server_addr = addr;
1336
1337         /*
1338          * Use defaults whereever applicable.
1339          */
1340         if (ic_defaults() < 0)
1341                 return -1;
1342
1343         /*
1344          * Close all network devices except the device we've
1345          * autoconfigured and set up routes.
1346          */
1347         ic_close_devs();
1348         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1349                 return -1;
1350
1351         /*
1352          * Record which protocol was actually used.
1353          */
1354 #ifdef IPCONFIG_DYNAMIC
1355         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1356 #endif
1357
1358 #ifndef IPCONFIG_SILENT
1359         /*
1360          * Clue in the operator.
1361          */
1362         printk("IP-Config: Complete:");
1363         printk("\n      device=%s", ic_dev->name);
1364         printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
1365         printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
1366         printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
1367         printk(",\n     host=%s, domain=%s, nis-domain=%s",
1368                system_utsname.nodename, ic_domain, system_utsname.domainname);
1369         printk(",\n     bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
1370         printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
1371         printk(", rootpath=%s", root_server_path);
1372         printk("\n");
1373 #endif /* !SILENT */
1374
1375         return 0;
1376 }
1377
1378 late_initcall(ip_auto_config);
1379
1380
1381 /*
1382  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1383  *  command line parameter. It consists of option fields separated by colons in
1384  *  the following order:
1385  *
1386  *  <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO>
1387  *
1388  *  Any of the fields can be empty which means to use a default value:
1389  *      <client-ip>     - address given by BOOTP or RARP
1390  *      <server-ip>     - address of host returning BOOTP or RARP packet
1391  *      <gw-ip>         - none, or the address returned by BOOTP
1392  *      <netmask>       - automatically determined from <client-ip>, or the
1393  *                        one returned by BOOTP
1394  *      <host name>     - <client-ip> in ASCII notation, or the name returned
1395  *                        by BOOTP
1396  *      <device>        - use all available devices
1397  *      <PROTO>:
1398  *         off|none         - don't do autoconfig at all (DEFAULT)
1399  *         on|any           - use any configured protocol
1400  *         dhcp|bootp|rarp  - use only the specified protocol
1401  *         both             - use both BOOTP and RARP (not DHCP)
1402  */
1403 static int __init ic_proto_name(char *name)
1404 {
1405         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1406                 return 1;
1407         }
1408 #ifdef CONFIG_IP_PNP_DHCP
1409         else if (!strcmp(name, "dhcp")) {
1410                 ic_proto_enabled &= ~IC_RARP;
1411                 return 1;
1412         }
1413 #endif
1414 #ifdef CONFIG_IP_PNP_BOOTP
1415         else if (!strcmp(name, "bootp")) {
1416                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1417                 return 1;
1418         }
1419 #endif
1420 #ifdef CONFIG_IP_PNP_RARP
1421         else if (!strcmp(name, "rarp")) {
1422                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1423                 return 1;
1424         }
1425 #endif
1426 #ifdef IPCONFIG_DYNAMIC
1427         else if (!strcmp(name, "both")) {
1428                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1429                 return 1;
1430         }
1431 #endif
1432         return 0;
1433 }
1434
1435 static int __init ip_auto_config_setup(char *addrs)
1436 {
1437         char *cp, *ip, *dp;
1438         int num = 0;
1439
1440         ic_set_manually = 1;
1441
1442         ic_enable = (*addrs &&
1443                 (strcmp(addrs, "off") != 0) &&
1444                 (strcmp(addrs, "none") != 0));
1445         if (!ic_enable)
1446                 return 1;
1447
1448         if (ic_proto_name(addrs))
1449                 return 1;
1450
1451         /* Parse the whole string */
1452         ip = addrs;
1453         while (ip && *ip) {
1454                 if ((cp = strchr(ip, ':')))
1455                         *cp++ = '\0';
1456                 if (strlen(ip) > 0) {
1457                         DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1458                         switch (num) {
1459                         case 0:
1460                                 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY)
1461                                         ic_myaddr = INADDR_NONE;
1462                                 break;
1463                         case 1:
1464                                 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
1465                                         ic_servaddr = INADDR_NONE;
1466                                 break;
1467                         case 2:
1468                                 if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
1469                                         ic_gateway = INADDR_NONE;
1470                                 break;
1471                         case 3:
1472                                 if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
1473                                         ic_netmask = INADDR_NONE;
1474                                 break;
1475                         case 4:
1476                                 if ((dp = strchr(ip, '.'))) {
1477                                         *dp++ = '\0';
1478                                         strlcpy(system_utsname.domainname, dp,
1479                                                 sizeof(system_utsname.domainname));
1480                                 }
1481                                 strlcpy(system_utsname.nodename, ip,
1482                                         sizeof(system_utsname.nodename));
1483                                 ic_host_name_set = 1;
1484                                 break;
1485                         case 5:
1486                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1487                                 break;
1488                         case 6:
1489                                 ic_proto_name(ip);
1490                                 break;
1491                         }
1492                 }
1493                 ip = cp;
1494                 num++;
1495         }
1496
1497         return 1;
1498 }
1499
1500 static int __init nfsaddrs_config_setup(char *addrs)
1501 {
1502         return ip_auto_config_setup(addrs);
1503 }
1504
1505 __setup("ip=", ip_auto_config_setup);
1506 __setup("nfsaddrs=", nfsaddrs_config_setup);