linux/net/ipv4/ipconfig.c
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   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 */
 115int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
 116
 117static int ic_enable __initdata = 0;            /* IP config enabled? */
 118
 119/* Protocol choice */
 120int 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
 132static int ic_host_name_set __initdata = 0;     /* Host name set by us? */
 133
 134__be32 ic_myaddr = NONE;                /* My IP address */
 135static __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 */
 141u8 root_server_path[256] = { 0, };      /* Path to mount as root */
 142
 143u32 ic_dev_xid;         /* Device under configuration */
 144
 145/* vendor class identifier */
 146static char vendor_class_identifier[253] __initdata;
 147
 148/* Persistent data: */
 149
 150static int ic_proto_used;                       /* Protocol used, if any */
 151static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
 152static u8 ic_domain[64];                /* DNS (not NIS) domain name */
 153
 154/*
 155 * Private state.
 156 */
 157
 158/* Name of user-selected boot device */
 159static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
 160
 161/* Protocols supported by available interfaces */
 162static int ic_proto_have_if __initdata = 0;
 163
 164/* MTU for boot device */
 165static int ic_dev_mtu __initdata = 0;
 166
 167#ifdef IPCONFIG_DYNAMIC
 168static DEFINE_SPINLOCK(ic_recv_lock);
 169static volatile int ic_got_reply __initdata = 0;    /* Proto(s) that replied */
 170#endif
 171#ifdef IPCONFIG_DHCP
 172static int ic_dhcp_msgtype __initdata = 0;      /* DHCP msg type received */
 173#endif
 174
 175
 176/*
 177 *      Network devices
 178 */
 179
 180struct ic_device {
 181        struct ic_device *next;
 182        struct net_device *dev;
 183        unsigned short flags;
 184        short able;
 185        __be32 xid;
 186};
 187
 188static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
 189static struct net_device *ic_dev __initdata = NULL;     /* Selected device */
 190
 191static 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
 201static 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
 269static 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
 292static inline void
 293set_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
 300static 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
 311static 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
 322static 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
 337static 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
 374static 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
 404static 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
 441static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 442
 443static struct packet_type rarp_packet_type __initdata = {
 444        .type = cpu_to_be16(ETH_P_RARP),
 445        .func = ic_rarp_recv,
 446};
 447
 448static inline void __init ic_rarp_init(void)
 449{
 450        dev_add_pack(&rarp_packet_type);
 451}
 452
 453static inline void __init ic_rarp_cleanup(void)
 454{
 455        dev_remove_pack(&rarp_packet_type);
 456}
 457
 458/*
 459 *  Process received RARP packet.
 460 */
 461static int __init
 462ic_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
 541drop_unlock:
 542        /* Show's over.  Nothing to see here.  */
 543        spin_unlock(&ic_recv_lock);
 544
 545drop:
 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 */
 555static 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
 569struct 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
 603static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 604
 605static 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
 615static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
 616
 617#ifdef IPCONFIG_DHCP
 618
 619static void __init
 620ic_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 (*vendor_class_identifier) {
 669                        printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
 670                               vendor_class_identifier);
 671                        *e++ = 60;      /* Class-identifier */
 672                        len = strlen(vendor_class_identifier);
 673                        *e++ = len;
 674                        memcpy(e, vendor_class_identifier, len);
 675                        e += len;
 676                }
 677        }
 678
 679        *e++ = 255;     /* End of the list */
 680}
 681
 682#endif /* IPCONFIG_DHCP */
 683
 684static void __init ic_bootp_init_ext(u8 *e)
 685{
 686        memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 687        e += 4;
 688        *e++ = 1;               /* Subnet mask request */
 689        *e++ = 4;
 690        e += 4;
 691        *e++ = 3;               /* Default gateway request */
 692        *e++ = 4;
 693        e += 4;
 694        *e++ = 5;               /* Name server request */
 695        *e++ = 8;
 696        e += 8;
 697        *e++ = 12;              /* Host name request */
 698        *e++ = 32;
 699        e += 32;
 700        *e++ = 40;              /* NIS Domain name request */
 701        *e++ = 32;
 702        e += 32;
 703        *e++ = 17;              /* Boot path */
 704        *e++ = 40;
 705        e += 40;
 706
 707        *e++ = 57;              /* set extension buffer size for reply */
 708        *e++ = 2;
 709        *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
 710        *e++ = 150;
 711
 712        *e++ = 255;             /* End of the list */
 713}
 714
 715
 716/*
 717 *  Initialize the DHCP/BOOTP mechanism.
 718 */
 719static inline void __init ic_bootp_init(void)
 720{
 721        int i;
 722
 723        for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
 724                ic_nameservers[i] = NONE;
 725
 726        dev_add_pack(&bootp_packet_type);
 727}
 728
 729
 730/*
 731 *  DHCP/BOOTP cleanup.
 732 */
 733static inline void __init ic_bootp_cleanup(void)
 734{
 735        dev_remove_pack(&bootp_packet_type);
 736}
 737
 738
 739/*
 740 *  Send DHCP/BOOTP request to single interface.
 741 */
 742static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
 743{
 744        struct net_device *dev = d->dev;
 745        struct sk_buff *skb;
 746        struct bootp_pkt *b;
 747        struct iphdr *h;
 748
 749        /* Allocate packet */
 750        skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15,
 751                        GFP_KERNEL);
 752        if (!skb)
 753                return;
 754        skb_reserve(skb, LL_RESERVED_SPACE(dev));
 755        b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
 756        memset(b, 0, sizeof(struct bootp_pkt));
 757
 758        /* Construct IP header */
 759        skb_reset_network_header(skb);
 760        h = ip_hdr(skb);
 761        h->version = 4;
 762        h->ihl = 5;
 763        h->tot_len = htons(sizeof(struct bootp_pkt));
 764        h->frag_off = htons(IP_DF);
 765        h->ttl = 64;
 766        h->protocol = IPPROTO_UDP;
 767        h->daddr = htonl(INADDR_BROADCAST);
 768        h->check = ip_fast_csum((unsigned char *) h, h->ihl);
 769
 770        /* Construct UDP header */
 771        b->udph.source = htons(68);
 772        b->udph.dest = htons(67);
 773        b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
 774        /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
 775
 776        /* Construct DHCP/BOOTP header */
 777        b->op = BOOTP_REQUEST;
 778        if (dev->type < 256) /* check for false types */
 779                b->htype = dev->type;
 780        else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
 781                b->htype = ARPHRD_IEEE802;
 782        else if (dev->type == ARPHRD_FDDI)
 783                b->htype = ARPHRD_ETHER;
 784        else {
 785                printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
 786                b->htype = dev->type; /* can cause undefined behavior */
 787        }
 788
 789        /* server_ip and your_ip address are both already zero per RFC2131 */
 790        b->hlen = dev->addr_len;
 791        memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
 792        b->secs = htons(jiffies_diff / HZ);
 793        b->xid = d->xid;
 794
 795        /* add DHCP options or BOOTP extensions */
 796#ifdef IPCONFIG_DHCP
 797        if (ic_proto_enabled & IC_USE_DHCP)
 798                ic_dhcp_init_options(b->exten);
 799        else
 800#endif
 801                ic_bootp_init_ext(b->exten);
 802
 803        /* Chain packet down the line... */
 804        skb->dev = dev;
 805        skb->protocol = htons(ETH_P_IP);
 806        if (dev_hard_header(skb, dev, ntohs(skb->protocol),
 807                            dev->broadcast, dev->dev_addr, skb->len) < 0 ||
 808            dev_queue_xmit(skb) < 0)
 809                printk("E");
 810}
 811
 812
 813/*
 814 *  Copy BOOTP-supplied string if not already set.
 815 */
 816static int __init ic_bootp_string(char *dest, char *src, int len, int max)
 817{
 818        if (!len)
 819                return 0;
 820        if (len > max-1)
 821                len = max-1;
 822        memcpy(dest, src, len);
 823        dest[len] = '\0';
 824        return 1;
 825}
 826
 827
 828/*
 829 *  Process BOOTP extensions.
 830 */
 831static void __init ic_do_bootp_ext(u8 *ext)
 832{
 833       u8 servers;
 834       int i;
 835        u16 mtu;
 836
 837#ifdef IPCONFIG_DEBUG
 838        u8 *c;
 839
 840        printk("DHCP/BOOTP: Got extension %d:",*ext);
 841        for (c=ext+2; c<ext+2+ext[1]; c++)
 842                printk(" %02x", *c);
 843        printk("\n");
 844#endif
 845
 846        switch (*ext++) {
 847                case 1:         /* Subnet mask */
 848                        if (ic_netmask == NONE)
 849                                memcpy(&ic_netmask, ext+1, 4);
 850                        break;
 851                case 3:         /* Default gateway */
 852                        if (ic_gateway == NONE)
 853                                memcpy(&ic_gateway, ext+1, 4);
 854                        break;
 855                case 6:         /* DNS server */
 856                        servers= *ext/4;
 857                        if (servers > CONF_NAMESERVERS_MAX)
 858                                servers = CONF_NAMESERVERS_MAX;
 859                        for (i = 0; i < servers; i++) {
 860                                if (ic_nameservers[i] == NONE)
 861                                        memcpy(&ic_nameservers[i], ext+1+4*i, 4);
 862                        }
 863                        break;
 864                case 12:        /* Host name */
 865                        ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
 866                        ic_host_name_set = 1;
 867                        break;
 868                case 15:        /* Domain name (DNS) */
 869                        ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
 870                        break;
 871                case 17:        /* Root path */
 872                        if (!root_server_path[0])
 873                                ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
 874                        break;
 875                case 26:        /* Interface MTU */
 876                        memcpy(&mtu, ext+1, sizeof(mtu));
 877                        ic_dev_mtu = ntohs(mtu);
 878                        break;
 879                case 40:        /* NIS Domain name (_not_ DNS) */
 880                        ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
 881                        break;
 882        }
 883}
 884
 885
 886/*
 887 *  Receive BOOTP reply.
 888 */
 889static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 890{
 891        struct bootp_pkt *b;
 892        struct iphdr *h;
 893        struct ic_device *d;
 894        int len, ext_len;
 895
 896        if (!net_eq(dev_net(dev), &init_net))
 897                goto drop;
 898
 899        /* Perform verifications before taking the lock.  */
 900        if (skb->pkt_type == PACKET_OTHERHOST)
 901                goto drop;
 902
 903        if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 904                return NET_RX_DROP;
 905
 906        if (!pskb_may_pull(skb,
 907                           sizeof(struct iphdr) +
 908                           sizeof(struct udphdr)))
 909                goto drop;
 910
 911        b = (struct bootp_pkt *)skb_network_header(skb);
 912        h = &b->iph;
 913
 914        if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
 915                goto drop;
 916
 917        /* Fragments are not supported */
 918        if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
 919                if (net_ratelimit())
 920                        printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
 921                               "reply.\n");
 922                goto drop;
 923        }
 924
 925        if (skb->len < ntohs(h->tot_len))
 926                goto drop;
 927
 928        if (ip_fast_csum((char *) h, h->ihl))
 929                goto drop;
 930
 931        if (b->udph.source != htons(67) || b->udph.dest != htons(68))
 932                goto drop;
 933
 934        if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
 935                goto drop;
 936
 937        len = ntohs(b->udph.len) - sizeof(struct udphdr);
 938        ext_len = len - (sizeof(*b) -
 939                         sizeof(struct iphdr) -
 940                         sizeof(struct udphdr) -
 941                         sizeof(b->exten));
 942        if (ext_len < 0)
 943                goto drop;
 944
 945        /* Ok the front looks good, make sure we can get at the rest.  */
 946        if (!pskb_may_pull(skb, skb->len))
 947                goto drop;
 948
 949        b = (struct bootp_pkt *)skb_network_header(skb);
 950        h = &b->iph;
 951
 952        /* One reply at a time, please. */
 953        spin_lock(&ic_recv_lock);
 954
 955        /* If we already have a reply, just drop the packet */
 956        if (ic_got_reply)
 957                goto drop_unlock;
 958
 959        /* Find the ic_device that the packet arrived on */
 960        d = ic_first_dev;
 961        while (d && d->dev != dev)
 962                d = d->next;
 963        if (!d)
 964                goto drop_unlock;  /* should never happen */
 965
 966        /* Is it a reply to our BOOTP request? */
 967        if (b->op != BOOTP_REPLY ||
 968            b->xid != d->xid) {
 969                if (net_ratelimit())
 970                        printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
 971                               "op[%x] xid[%x]\n",
 972                               b->op, b->xid);
 973                goto drop_unlock;
 974        }
 975
 976        /* Is it a reply for the device we are configuring? */
 977        if (b->xid != ic_dev_xid) {
 978                if (net_ratelimit())
 979                        printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet\n");
 980                goto drop_unlock;
 981        }
 982
 983        /* Parse extensions */
 984        if (ext_len >= 4 &&
 985            !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
 986                u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
 987                u8 *ext;
 988
 989#ifdef IPCONFIG_DHCP
 990                if (ic_proto_enabled & IC_USE_DHCP) {
 991                        __be32 server_id = NONE;
 992                        int mt = 0;
 993
 994                        ext = &b->exten[4];
 995                        while (ext < end && *ext != 0xff) {
 996                                u8 *opt = ext++;
 997                                if (*opt == 0)  /* Padding */
 998                                        continue;
 999                                ext += *ext + 1;
1000                                if (ext >= end)
1001                                        break;
1002                                switch (*opt) {
1003                                case 53:        /* Message type */
1004                                        if (opt[1])
1005                                                mt = opt[2];
1006                                        break;
1007                                case 54:        /* Server ID (IP address) */
1008                                        if (opt[1] >= 4)
1009                                                memcpy(&server_id, opt + 2, 4);
1010                                        break;
1011                                }
1012                        }
1013
1014#ifdef IPCONFIG_DEBUG
1015                        printk("DHCP: Got message type %d\n", mt);
1016#endif
1017
1018                        switch (mt) {
1019                        case DHCPOFFER:
1020                                /* While in the process of accepting one offer,
1021                                 * ignore all others.
1022                                 */
1023                                if (ic_myaddr != NONE)
1024                                        goto drop_unlock;
1025
1026                                /* Let's accept that offer. */
1027                                ic_myaddr = b->your_ip;
1028                                ic_servaddr = server_id;
1029#ifdef IPCONFIG_DEBUG
1030                                printk("DHCP: Offered address %pI4 by server %pI4\n",
1031                                       &ic_myaddr, &ic_servaddr);
1032#endif
1033                                /* The DHCP indicated server address takes
1034                                 * precedence over the bootp header one if
1035                                 * they are different.
1036                                 */
1037                                if ((server_id != NONE) &&
1038                                    (b->server_ip != server_id))
1039                                        b->server_ip = ic_servaddr;
1040                                break;
1041
1042                        case DHCPACK:
1043                                if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1044                                        goto drop_unlock;
1045
1046                                /* Yeah! */
1047                                break;
1048
1049                        default:
1050                                /* Urque.  Forget it*/
1051                                ic_myaddr = NONE;
1052                                ic_servaddr = NONE;
1053                                goto drop_unlock;
1054                        }
1055
1056                        ic_dhcp_msgtype = mt;
1057
1058                }
1059#endif /* IPCONFIG_DHCP */
1060
1061                ext = &b->exten[4];
1062                while (ext < end && *ext != 0xff) {
1063                        u8 *opt = ext++;
1064                        if (*opt == 0)  /* Padding */
1065                                continue;
1066                        ext += *ext + 1;
1067                        if (ext < end)
1068                                ic_do_bootp_ext(opt);
1069                }
1070        }
1071
1072        /* We have a winner! */
1073        ic_dev = dev;
1074        ic_myaddr = b->your_ip;
1075        ic_servaddr = b->server_ip;
1076        if (ic_gateway == NONE && b->relay_ip)
1077                ic_gateway = b->relay_ip;
1078        if (ic_nameservers[0] == NONE)
1079                ic_nameservers[0] = ic_servaddr;
1080        ic_got_reply = IC_BOOTP;
1081
1082drop_unlock:
1083        /* Show's over.  Nothing to see here.  */
1084        spin_unlock(&ic_recv_lock);
1085
1086drop:
1087        /* Throw the packet out. */
1088        kfree_skb(skb);
1089
1090        return 0;
1091}
1092
1093
1094#endif
1095
1096
1097/*
1098 *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1099 */
1100
1101#ifdef IPCONFIG_DYNAMIC
1102
1103static int __init ic_dynamic(void)
1104{
1105        int retries;
1106        struct ic_device *d;
1107        unsigned long start_jiffies, timeout, jiff;
1108        int do_bootp = ic_proto_have_if & IC_BOOTP;
1109        int do_rarp = ic_proto_have_if & IC_RARP;
1110
1111        /*
1112         * If none of DHCP/BOOTP/RARP was selected, return with an error.
1113         * This routine gets only called when some pieces of information
1114         * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1115         */
1116        if (!ic_proto_enabled) {
1117                printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1118                return -1;
1119        }
1120
1121#ifdef IPCONFIG_BOOTP
1122        if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1123                printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1124#endif
1125#ifdef IPCONFIG_RARP
1126        if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1127                printk(KERN_ERR "RARP: No suitable device found.\n");
1128#endif
1129
1130        if (!ic_proto_have_if)
1131                /* Error message already printed */
1132                return -1;
1133
1134        /*
1135         * Setup protocols
1136         */
1137#ifdef IPCONFIG_BOOTP
1138        if (do_bootp)
1139                ic_bootp_init();
1140#endif
1141#ifdef IPCONFIG_RARP
1142        if (do_rarp)
1143                ic_rarp_init();
1144#endif
1145
1146        /*
1147         * Send requests and wait, until we get an answer. This loop
1148         * seems to be a terrible waste of CPU time, but actually there is
1149         * only one process running at all, so we don't need to use any
1150         * scheduler functions.
1151         * [Actually we could now, but the nothing else running note still
1152         *  applies.. - AC]
1153         */
1154        printk(KERN_NOTICE "Sending %s%s%s requests .",
1155               do_bootp
1156                ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1157               (do_bootp && do_rarp) ? " and " : "",
1158               do_rarp ? "RARP" : "");
1159
1160        start_jiffies = jiffies;
1161        d = ic_first_dev;
1162        retries = CONF_SEND_RETRIES;
1163        get_random_bytes(&timeout, sizeof(timeout));
1164        timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1165        for (;;) {
1166                /* Track the device we are configuring */
1167                ic_dev_xid = d->xid;
1168
1169#ifdef IPCONFIG_BOOTP
1170                if (do_bootp && (d->able & IC_BOOTP))
1171                        ic_bootp_send_if(d, jiffies - start_jiffies);
1172#endif
1173#ifdef IPCONFIG_RARP
1174                if (do_rarp && (d->able & IC_RARP))
1175                        ic_rarp_send_if(d);
1176#endif
1177
1178                jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1179                while (time_before(jiffies, jiff) && !ic_got_reply)
1180                        schedule_timeout_uninterruptible(1);
1181#ifdef IPCONFIG_DHCP
1182                /* DHCP isn't done until we get a DHCPACK. */
1183                if ((ic_got_reply & IC_BOOTP) &&
1184                    (ic_proto_enabled & IC_USE_DHCP) &&
1185                    ic_dhcp_msgtype != DHCPACK) {
1186                        ic_got_reply = 0;
1187                        printk(",");
1188                        continue;
1189                }
1190#endif /* IPCONFIG_DHCP */
1191
1192                if (ic_got_reply) {
1193                        printk(" OK\n");
1194                        break;
1195                }
1196
1197                if ((d = d->next))
1198                        continue;
1199
1200                if (! --retries) {
1201                        printk(" timed out!\n");
1202                        break;
1203                }
1204
1205                d = ic_first_dev;
1206
1207                timeout = timeout CONF_TIMEOUT_MULT;
1208                if (timeout > CONF_TIMEOUT_MAX)
1209                        timeout = CONF_TIMEOUT_MAX;
1210
1211                printk(".");
1212        }
1213
1214#ifdef IPCONFIG_BOOTP
1215        if (do_bootp)
1216                ic_bootp_cleanup();
1217#endif
1218#ifdef IPCONFIG_RARP
1219        if (do_rarp)
1220                ic_rarp_cleanup();
1221#endif
1222
1223        if (!ic_got_reply) {
1224                ic_myaddr = NONE;
1225                return -1;
1226        }
1227
1228        printk("IP-Config: Got %s answer from %pI4, ",
1229                ((ic_got_reply & IC_RARP) ? "RARP"
1230                 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1231                &ic_servaddr);
1232        printk("my address is %pI4\n", &ic_myaddr);
1233
1234        return 0;
1235}
1236
1237#endif /* IPCONFIG_DYNAMIC */
1238
1239#ifdef CONFIG_PROC_FS
1240
1241static int pnp_seq_show(struct seq_file *seq, void *v)
1242{
1243        int i;
1244
1245        if (ic_proto_used & IC_PROTO)
1246                seq_printf(seq, "#PROTO: %s\n",
1247                           (ic_proto_used & IC_RARP) ? "RARP"
1248                           : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1249        else
1250                seq_puts(seq, "#MANUAL\n");
1251
1252        if (ic_domain[0])
1253                seq_printf(seq,
1254                           "domain %s\n", ic_domain);
1255        for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1256                if (ic_nameservers[i] != NONE)
1257                        seq_printf(seq, "nameserver %pI4\n",
1258                                   &ic_nameservers[i]);
1259        }
1260        if (ic_servaddr != NONE)
1261                seq_printf(seq, "bootserver %pI4\n",
1262                           &ic_servaddr);
1263        return 0;
1264}
1265
1266static int pnp_seq_open(struct inode *indoe, struct file *file)
1267{
1268        return single_open(file, pnp_seq_show, NULL);
1269}
1270
1271static const struct file_operations pnp_seq_fops = {
1272        .owner          = THIS_MODULE,
1273        .open           = pnp_seq_open,
1274        .read           = seq_read,
1275        .llseek         = seq_lseek,
1276        .release        = single_release,
1277};
1278#endif /* CONFIG_PROC_FS */
1279
1280/*
1281 *  Extract IP address from the parameter string if needed. Note that we
1282 *  need to have root_server_addr set _before_ IPConfig gets called as it
1283 *  can override it.
1284 */
1285__be32 __init root_nfs_parse_addr(char *name)
1286{
1287        __be32 addr;
1288        int octets = 0;
1289        char *cp, *cq;
1290
1291        cp = cq = name;
1292        while (octets < 4) {
1293                while (*cp >= '0' && *cp <= '9')
1294                        cp++;
1295                if (cp == cq || cp - cq > 3)
1296                        break;
1297                if (*cp == '.' || octets == 3)
1298                        octets++;
1299                if (octets < 4)
1300                        cp++;
1301                cq = cp;
1302        }
1303        if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1304                if (*cp == ':')
1305                        *cp++ = '\0';
1306                addr = in_aton(name);
1307                memmove(name, cp, strlen(cp) + 1);
1308        } else
1309                addr = NONE;
1310
1311        return addr;
1312}
1313
1314#define DEVICE_WAIT_MAX         12 /* 12 seconds */
1315
1316static int __init wait_for_devices(void)
1317{
1318        int i;
1319
1320        msleep(CONF_PRE_OPEN);
1321        for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1322                struct net_device *dev;
1323                int found = 0;
1324
1325                rtnl_lock();
1326                for_each_netdev(&init_net, dev) {
1327                        if (ic_device_match(dev)) {
1328                                found = 1;
1329                                break;
1330                        }
1331                }
1332                rtnl_unlock();
1333                if (found)
1334                        return 0;
1335                ssleep(1);
1336        }
1337        return -ENODEV;
1338}
1339
1340/*
1341 *      IP Autoconfig dispatcher.
1342 */
1343
1344static int __init ip_auto_config(void)
1345{
1346        __be32 addr;
1347#ifdef IPCONFIG_DYNAMIC
1348        int retries = CONF_OPEN_RETRIES;
1349#endif
1350        int err;
1351
1352#ifdef CONFIG_PROC_FS
1353        proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1354#endif /* CONFIG_PROC_FS */
1355
1356        if (!ic_enable)
1357                return 0;
1358
1359        DBG(("IP-Config: Entered.\n"));
1360#ifdef IPCONFIG_DYNAMIC
1361 try_try_again:
1362#endif
1363        /* Wait for devices to appear */
1364        err = wait_for_devices();
1365        if (err)
1366                return err;
1367
1368        /* Setup all network devices */
1369        err = ic_open_devs();
1370        if (err)
1371                return err;
1372
1373        /* Give drivers a chance to settle */
1374        ssleep(CONF_POST_OPEN);
1375
1376        /*
1377         * If the config information is insufficient (e.g., our IP address or
1378         * IP address of the boot server is missing or we have multiple network
1379         * interfaces and no default was set), use BOOTP or RARP to get the
1380         * missing values.
1381         */
1382        if (ic_myaddr == NONE ||
1383#ifdef CONFIG_ROOT_NFS
1384            (root_server_addr == NONE &&
1385             ic_servaddr == NONE &&
1386             ROOT_DEV == Root_NFS) ||
1387#endif
1388            ic_first_dev->next) {
1389#ifdef IPCONFIG_DYNAMIC
1390                if (ic_dynamic() < 0) {
1391                        ic_close_devs();
1392
1393                        /*
1394                         * I don't know why, but sometimes the
1395                         * eepro100 driver (at least) gets upset and
1396                         * doesn't work the first time it's opened.
1397                         * But then if you close it and reopen it, it
1398                         * works just fine.  So we need to try that at
1399                         * least once before giving up.
1400                         *
1401                         * Also, if the root will be NFS-mounted, we
1402                         * have nowhere to go if DHCP fails.  So we
1403                         * just have to keep trying forever.
1404                         *
1405                         *                              -- Chip
1406                         */
1407#ifdef CONFIG_ROOT_NFS
1408                        if (ROOT_DEV ==  Root_NFS) {
1409                                printk(KERN_ERR
1410                                        "IP-Config: Retrying forever (NFS root)...\n");
1411                                goto try_try_again;
1412                        }
1413#endif
1414
1415                        if (--retries) {
1416                                printk(KERN_ERR
1417                                       "IP-Config: Reopening network devices...\n");
1418                                goto try_try_again;
1419                        }
1420
1421                        /* Oh, well.  At least we tried. */
1422                        printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1423                        return -1;
1424                }
1425#else /* !DYNAMIC */
1426                printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1427                ic_close_devs();
1428                return -1;
1429#endif /* IPCONFIG_DYNAMIC */
1430        } else {
1431                /* Device selected manually or only one device -> use it */
1432                ic_dev = ic_first_dev->dev;
1433        }
1434
1435        addr = root_nfs_parse_addr(root_server_path);
1436        if (root_server_addr == NONE)
1437                root_server_addr = addr;
1438
1439        /*
1440         * Use defaults whereever applicable.
1441         */
1442        if (ic_defaults() < 0)
1443                return -1;
1444
1445        /*
1446         * Close all network devices except the device we've
1447         * autoconfigured and set up routes.
1448         */
1449        ic_close_devs();
1450        if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1451                return -1;
1452
1453        /*
1454         * Record which protocol was actually used.
1455         */
1456#ifdef IPCONFIG_DYNAMIC
1457        ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1458#endif
1459
1460#ifndef IPCONFIG_SILENT
1461        /*
1462         * Clue in the operator.
1463         */
1464        printk("IP-Config: Complete:");
1465        printk("\n     device=%s", ic_dev->name);
1466        printk(", addr=%pI4", &ic_myaddr);
1467        printk(", mask=%pI4", &ic_netmask);
1468        printk(", gw=%pI4", &ic_gateway);
1469        printk(",\n     host=%s, domain=%s, nis-domain=%s",
1470               utsname()->nodename, ic_domain, utsname()->domainname);
1471        printk(",\n     bootserver=%pI4", &ic_servaddr);
1472        printk(", rootserver=%pI4", &root_server_addr);
1473        printk(", rootpath=%s", root_server_path);
1474        if (ic_dev_mtu)
1475                printk(", mtu=%d", ic_dev_mtu);
1476        printk("\n");
1477#endif /* !SILENT */
1478
1479        return 0;
1480}
1481
1482late_initcall(ip_auto_config);
1483
1484
1485/*
1486 *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1487 *  command line parameter.  See Documentation/filesystems/nfs/nfsroot.txt.
1488 */
1489static int __init ic_proto_name(char *name)
1490{
1491        if (!strcmp(name, "on") || !strcmp(name, "any")) {
1492                return 1;
1493        }
1494        if (!strcmp(name, "off") || !strcmp(name, "none")) {
1495                return 0;
1496        }
1497#ifdef CONFIG_IP_PNP_DHCP
1498        else if (!strcmp(name, "dhcp")) {
1499                ic_proto_enabled &= ~IC_RARP;
1500                return 1;
1501        }
1502#endif
1503#ifdef CONFIG_IP_PNP_BOOTP
1504        else if (!strcmp(name, "bootp")) {
1505                ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1506                return 1;
1507        }
1508#endif
1509#ifdef CONFIG_IP_PNP_RARP
1510        else if (!strcmp(name, "rarp")) {
1511                ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1512                return 1;
1513        }
1514#endif
1515#ifdef IPCONFIG_DYNAMIC
1516        else if (!strcmp(name, "both")) {
1517                ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1518                return 1;
1519        }
1520#endif
1521        return 0;
1522}
1523
1524static int __init ip_auto_config_setup(char *addrs)
1525{
1526        char *cp, *ip, *dp;
1527        int num = 0;
1528
1529        ic_set_manually = 1;
1530        ic_enable = 1;
1531
1532        /*
1533         * If any dhcp, bootp etc options are set, leave autoconfig on
1534         * and skip the below static IP processing.
1535         */
1536        if (ic_proto_name(addrs))
1537                return 1;
1538
1539        /* If no static IP is given, turn off autoconfig and bail.  */
1540        if (*addrs == 0 ||
1541            strcmp(addrs, "off") == 0 ||
1542            strcmp(addrs, "none") == 0) {
1543                ic_enable = 0;
1544                return 1;
1545        }
1546
1547        /* Parse string for static IP assignment.  */
1548        ip = addrs;
1549        while (ip && *ip) {
1550                if ((cp = strchr(ip, ':')))
1551                        *cp++ = '\0';
1552                if (strlen(ip) > 0) {
1553                        DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1554                        switch (num) {
1555                        case 0:
1556                                if ((ic_myaddr = in_aton(ip)) == ANY)
1557                                        ic_myaddr = NONE;
1558                                break;
1559                        case 1:
1560                                if ((ic_servaddr = in_aton(ip)) == ANY)
1561                                        ic_servaddr = NONE;
1562                                break;
1563                        case 2:
1564                                if ((ic_gateway = in_aton(ip)) == ANY)
1565                                        ic_gateway = NONE;
1566                                break;
1567                        case 3:
1568                                if ((ic_netmask = in_aton(ip)) == ANY)
1569                                        ic_netmask = NONE;
1570                                break;
1571                        case 4:
1572                                if ((dp = strchr(ip, '.'))) {
1573                                        *dp++ = '\0';
1574                                        strlcpy(utsname()->domainname, dp,
1575                                                sizeof(utsname()->domainname));
1576                                }
1577                                strlcpy(utsname()->nodename, ip,
1578                                        sizeof(utsname()->nodename));
1579                                ic_host_name_set = 1;
1580                                break;
1581                        case 5:
1582                                strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1583                                break;
1584                        case 6:
1585                                if (ic_proto_name(ip) == 0 &&
1586                                    ic_myaddr == NONE) {
1587                                        ic_enable = 0;
1588                                }
1589                                break;
1590                        }
1591                }
1592                ip = cp;
1593                num++;
1594        }
1595
1596        return 1;
1597}
1598
1599static int __init nfsaddrs_config_setup(char *addrs)
1600{
1601        return ip_auto_config_setup(addrs);
1602}
1603
1604static int __init vendor_class_identifier_setup(char *addrs)
1605{
1606        if (strlcpy(vendor_class_identifier, addrs,
1607                    sizeof(vendor_class_identifier))
1608            >= sizeof(vendor_class_identifier))
1609                printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1610                       vendor_class_identifier);
1611        return 1;
1612}
1613
1614__setup("ip=", ip_auto_config_setup);
1615__setup("nfsaddrs=", nfsaddrs_config_setup);
1616__setup("dhcpclass=", vendor_class_identifier_setup);
1617