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 <net/net_namespace.h>
  57#include <net/arp.h>
  58#include <net/ip.h>
  59#include <net/ipconfig.h>
  60#include <net/route.h>
  61
  62#include <asm/uaccess.h>
  63#include <net/checksum.h>
  64#include <asm/processor.h>
  65
  66/* Define this to allow debugging output */
  67#undef IPCONFIG_DEBUG
  68
  69#ifdef IPCONFIG_DEBUG
  70#define DBG(x) printk x
  71#else
  72#define DBG(x) do { } while(0)
  73#endif
  74
  75#if defined(CONFIG_IP_PNP_DHCP)
  76#define IPCONFIG_DHCP
  77#endif
  78#if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
  79#define IPCONFIG_BOOTP
  80#endif
  81#if defined(CONFIG_IP_PNP_RARP)
  82#define IPCONFIG_RARP
  83#endif
  84#if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
  85#define IPCONFIG_DYNAMIC
  86#endif
  87
  88/* Define the friendly delay before and after opening net devices */
  89#define CONF_PRE_OPEN           500     /* Before opening: 1/2 second */
  90#define CONF_POST_OPEN          1       /* After opening: 1 second */
  91
  92/* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
  93#define CONF_OPEN_RETRIES       2       /* (Re)open devices twice */
  94#define CONF_SEND_RETRIES       6       /* Send six requests per open */
  95#define CONF_INTER_TIMEOUT      (HZ/2)  /* Inter-device timeout: 1/2 second */
  96#define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
  97#define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
  98#define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
  99#define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
 100#define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
 101                                           - '3' from resolv.h */
 102
 103#define NONE cpu_to_be32(INADDR_NONE)
 104#define ANY cpu_to_be32(INADDR_ANY)
 105
 106/*
 107 * Public IP configuration
 108 */
 109
 110/* This is used by platforms which might be able to set the ipconfig
 111 * variables using firmware environment vars.  If this is set, it will
 112 * ignore such firmware variables.
 113 */
 114int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
 115
 116static int ic_enable __initdata = 0;            /* IP config enabled? */
 117
 118/* Protocol choice */
 119int ic_proto_enabled __initdata = 0
 120#ifdef IPCONFIG_BOOTP
 121                        | IC_BOOTP
 122#endif
 123#ifdef CONFIG_IP_PNP_DHCP
 124                        | IC_USE_DHCP
 125#endif
 126#ifdef IPCONFIG_RARP
 127                        | IC_RARP
 128#endif
 129                        ;
 130
 131static int ic_host_name_set __initdata = 0;     /* Host name set by us? */
 132
 133__be32 ic_myaddr = NONE;                /* My IP address */
 134static __be32 ic_netmask = NONE;        /* Netmask for local subnet */
 135__be32 ic_gateway = NONE;       /* Gateway IP address */
 136
 137__be32 ic_servaddr = NONE;      /* Boot server IP address */
 138
 139__be32 root_server_addr = NONE; /* Address of NFS server */
 140u8 root_server_path[256] = { 0, };      /* Path to mount as root */
 141
 142u32 ic_dev_xid;         /* Device under configuration */
 143
 144/* vendor class identifier */
 145static char vendor_class_identifier[253] __initdata;
 146
 147/* Persistent data: */
 148
 149static int ic_proto_used;                       /* Protocol used, if any */
 150static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
 151static u8 ic_domain[64];                /* DNS (not NIS) domain name */
 152
 153/*
 154 * Private state.
 155 */
 156
 157/* Name of user-selected boot device */
 158static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
 159
 160/* Protocols supported by available interfaces */
 161static int ic_proto_have_if __initdata = 0;
 162
 163#ifdef IPCONFIG_DYNAMIC
 164static DEFINE_SPINLOCK(ic_recv_lock);
 165static volatile int ic_got_reply __initdata = 0;    /* Proto(s) that replied */
 166#endif
 167#ifdef IPCONFIG_DHCP
 168static int ic_dhcp_msgtype __initdata = 0;      /* DHCP msg type received */
 169#endif
 170
 171
 172/*
 173 *      Network devices
 174 */
 175
 176struct ic_device {
 177        struct ic_device *next;
 178        struct net_device *dev;
 179        unsigned short flags;
 180        short able;
 181        __be32 xid;
 182};
 183
 184static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
 185static struct net_device *ic_dev __initdata = NULL;     /* Selected device */
 186
 187static int __init ic_open_devs(void)
 188{
 189        struct ic_device *d, **last;
 190        struct net_device *dev;
 191        unsigned short oflags;
 192
 193        last = &ic_first_dev;
 194        rtnl_lock();
 195
 196        /* bring loopback device up first */
 197        for_each_netdev(&init_net, dev) {
 198                if (!(dev->flags & IFF_LOOPBACK))
 199                        continue;
 200                if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
 201                        printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
 202        }
 203
 204        for_each_netdev(&init_net, dev) {
 205                if (dev->flags & IFF_LOOPBACK)
 206                        continue;
 207                if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
 208                    (!(dev->flags & IFF_LOOPBACK) &&
 209                     (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
 210                     strncmp(dev->name, "dummy", 5))) {
 211                        int able = 0;
 212                        if (dev->mtu >= 364)
 213                                able |= IC_BOOTP;
 214                        else
 215                                printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
 216                        if (!(dev->flags & IFF_NOARP))
 217                                able |= IC_RARP;
 218                        able &= ic_proto_enabled;
 219                        if (ic_proto_enabled && !able)
 220                                continue;
 221                        oflags = dev->flags;
 222                        if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
 223                                printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
 224                                continue;
 225                        }
 226                        if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
 227                                rtnl_unlock();
 228                                return -1;
 229                        }
 230                        d->dev = dev;
 231                        *last = d;
 232                        last = &d->next;
 233                        d->flags = oflags;
 234                        d->able = able;
 235                        if (able & IC_BOOTP)
 236                                get_random_bytes(&d->xid, sizeof(__be32));
 237                        else
 238                                d->xid = 0;
 239                        ic_proto_have_if |= able;
 240                        DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
 241                                dev->name, able, d->xid));
 242                }
 243        }
 244        rtnl_unlock();
 245
 246        *last = NULL;
 247
 248        if (!ic_first_dev) {
 249                if (user_dev_name[0])
 250                        printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
 251                else
 252                        printk(KERN_ERR "IP-Config: No network devices available.\n");
 253                return -1;
 254        }
 255        return 0;
 256}
 257
 258static void __init ic_close_devs(void)
 259{
 260        struct ic_device *d, *next;
 261        struct net_device *dev;
 262
 263        rtnl_lock();
 264        next = ic_first_dev;
 265        while ((d = next)) {
 266                next = d->next;
 267                dev = d->dev;
 268                if (dev != ic_dev) {
 269                        DBG(("IP-Config: Downing %s\n", dev->name));
 270                        dev_change_flags(dev, d->flags);
 271                }
 272                kfree(d);
 273        }
 274        rtnl_unlock();
 275}
 276
 277/*
 278 *      Interface to various network functions.
 279 */
 280
 281static inline void
 282set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
 283{
 284        sin->sin_family = AF_INET;
 285        sin->sin_addr.s_addr = addr;
 286        sin->sin_port = port;
 287}
 288
 289static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
 290{
 291        int res;
 292
 293        mm_segment_t oldfs = get_fs();
 294        set_fs(get_ds());
 295        res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
 296        set_fs(oldfs);
 297        return res;
 298}
 299
 300static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
 301{
 302        int res;
 303
 304        mm_segment_t oldfs = get_fs();
 305        set_fs(get_ds());
 306        res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
 307        set_fs(oldfs);
 308        return res;
 309}
 310
 311/*
 312 *      Set up interface addresses and routes.
 313 */
 314
 315static int __init ic_setup_if(void)
 316{
 317        struct ifreq ir;
 318        struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
 319        int err;
 320
 321        memset(&ir, 0, sizeof(ir));
 322        strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
 323        set_sockaddr(sin, ic_myaddr, 0);
 324        if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
 325                printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
 326                return -1;
 327        }
 328        set_sockaddr(sin, ic_netmask, 0);
 329        if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
 330                printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
 331                return -1;
 332        }
 333        set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
 334        if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
 335                printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
 336                return -1;
 337        }
 338        return 0;
 339}
 340
 341static int __init ic_setup_routes(void)
 342{
 343        /* No need to setup device routes, only the default route... */
 344
 345        if (ic_gateway != NONE) {
 346                struct rtentry rm;
 347                int err;
 348
 349                memset(&rm, 0, sizeof(rm));
 350                if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
 351                        printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
 352                        return -1;
 353                }
 354                set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
 355                set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
 356                set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
 357                rm.rt_flags = RTF_UP | RTF_GATEWAY;
 358                if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
 359                        printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
 360                        return -1;
 361                }
 362        }
 363
 364        return 0;
 365}
 366
 367/*
 368 *      Fill in default values for all missing parameters.
 369 */
 370
 371static int __init ic_defaults(void)
 372{
 373        /*
 374         *      At this point we have no userspace running so need not
 375         *      claim locks on system_utsname
 376         */
 377
 378        if (!ic_host_name_set)
 379                sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
 380
 381        if (root_server_addr == NONE)
 382                root_server_addr = ic_servaddr;
 383
 384        if (ic_netmask == NONE) {
 385                if (IN_CLASSA(ntohl(ic_myaddr)))
 386                        ic_netmask = htonl(IN_CLASSA_NET);
 387                else if (IN_CLASSB(ntohl(ic_myaddr)))
 388                        ic_netmask = htonl(IN_CLASSB_NET);
 389                else if (IN_CLASSC(ntohl(ic_myaddr)))
 390                        ic_netmask = htonl(IN_CLASSC_NET);
 391                else {
 392                        printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n",
 393                                &ic_myaddr);
 394                        return -1;
 395                }
 396                printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
 397        }
 398
 399        return 0;
 400}
 401
 402/*
 403 *      RARP support.
 404 */
 405
 406#ifdef IPCONFIG_RARP
 407
 408static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 409
 410static struct packet_type rarp_packet_type __initdata = {
 411        .type = cpu_to_be16(ETH_P_RARP),
 412        .func = ic_rarp_recv,
 413};
 414
 415static inline void __init ic_rarp_init(void)
 416{
 417        dev_add_pack(&rarp_packet_type);
 418}
 419
 420static inline void __init ic_rarp_cleanup(void)
 421{
 422        dev_remove_pack(&rarp_packet_type);
 423}
 424
 425/*
 426 *  Process received RARP packet.
 427 */
 428static int __init
 429ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 430{
 431        struct arphdr *rarp;
 432        unsigned char *rarp_ptr;
 433        __be32 sip, tip;
 434        unsigned char *sha, *tha;               /* s for "source", t for "target" */
 435        struct ic_device *d;
 436
 437        if (!net_eq(dev_net(dev), &init_net))
 438                goto drop;
 439
 440        if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 441                return NET_RX_DROP;
 442
 443        if (!pskb_may_pull(skb, sizeof(struct arphdr)))
 444                goto drop;
 445
 446        /* Basic sanity checks can be done without the lock.  */
 447        rarp = (struct arphdr *)skb_transport_header(skb);
 448
 449        /* If this test doesn't pass, it's not IP, or we should
 450         * ignore it anyway.
 451         */
 452        if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
 453                goto drop;
 454
 455        /* If it's not a RARP reply, delete it. */
 456        if (rarp->ar_op != htons(ARPOP_RREPLY))
 457                goto drop;
 458
 459        /* If it's not Ethernet, delete it. */
 460        if (rarp->ar_pro != htons(ETH_P_IP))
 461                goto drop;
 462
 463        if (!pskb_may_pull(skb, arp_hdr_len(dev)))
 464                goto drop;
 465
 466        /* OK, it is all there and looks valid, process... */
 467        rarp = (struct arphdr *)skb_transport_header(skb);
 468        rarp_ptr = (unsigned char *) (rarp + 1);
 469
 470        /* One reply at a time, please. */
 471        spin_lock(&ic_recv_lock);
 472
 473        /* If we already have a reply, just drop the packet */
 474        if (ic_got_reply)
 475                goto drop_unlock;
 476
 477        /* Find the ic_device that the packet arrived on */
 478        d = ic_first_dev;
 479        while (d && d->dev != dev)
 480                d = d->next;
 481        if (!d)
 482                goto drop_unlock;       /* should never happen */
 483
 484        /* Extract variable-width fields */
 485        sha = rarp_ptr;
 486        rarp_ptr += dev->addr_len;
 487        memcpy(&sip, rarp_ptr, 4);
 488        rarp_ptr += 4;
 489        tha = rarp_ptr;
 490        rarp_ptr += dev->addr_len;
 491        memcpy(&tip, rarp_ptr, 4);
 492
 493        /* Discard packets which are not meant for us. */
 494        if (memcmp(tha, dev->dev_addr, dev->addr_len))
 495                goto drop_unlock;
 496
 497        /* Discard packets which are not from specified server. */
 498        if (ic_servaddr != NONE && ic_servaddr != sip)
 499                goto drop_unlock;
 500
 501        /* We have a winner! */
 502        ic_dev = dev;
 503        if (ic_myaddr == NONE)
 504                ic_myaddr = tip;
 505        ic_servaddr = sip;
 506        ic_got_reply = IC_RARP;
 507
 508drop_unlock:
 509        /* Show's over.  Nothing to see here.  */
 510        spin_unlock(&ic_recv_lock);
 511
 512drop:
 513        /* Throw the packet out. */
 514        kfree_skb(skb);
 515        return 0;
 516}
 517
 518
 519/*
 520 *  Send RARP request packet over a single interface.
 521 */
 522static void __init ic_rarp_send_if(struct ic_device *d)
 523{
 524        struct net_device *dev = d->dev;
 525        arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
 526                 dev->dev_addr, dev->dev_addr);
 527}
 528#endif
 529
 530/*
 531 *      DHCP/BOOTP support.
 532 */
 533
 534#ifdef IPCONFIG_BOOTP
 535
 536struct bootp_pkt {              /* BOOTP packet format */
 537        struct iphdr iph;       /* IP header */
 538        struct udphdr udph;     /* UDP header */
 539        u8 op;                  /* 1=request, 2=reply */
 540        u8 htype;               /* HW address type */
 541        u8 hlen;                /* HW address length */
 542        u8 hops;                /* Used only by gateways */
 543        __be32 xid;             /* Transaction ID */
 544        __be16 secs;            /* Seconds since we started */
 545        __be16 flags;           /* Just what it says */
 546        __be32 client_ip;               /* Client's IP address if known */
 547        __be32 your_ip;         /* Assigned IP address */
 548        __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
 549        __be32 relay_ip;                /* IP address of BOOTP relay */
 550        u8 hw_addr[16];         /* Client's HW address */
 551        u8 serv_name[64];       /* Server host name */
 552        u8 boot_file[128];      /* Name of boot file */
 553        u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
 554};
 555
 556/* packet ops */
 557#define BOOTP_REQUEST   1
 558#define BOOTP_REPLY     2
 559
 560/* DHCP message types */
 561#define DHCPDISCOVER    1
 562#define DHCPOFFER       2
 563#define DHCPREQUEST     3
 564#define DHCPDECLINE     4
 565#define DHCPACK         5
 566#define DHCPNAK         6
 567#define DHCPRELEASE     7
 568#define DHCPINFORM      8
 569
 570static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 571
 572static struct packet_type bootp_packet_type __initdata = {
 573        .type = cpu_to_be16(ETH_P_IP),
 574        .func = ic_bootp_recv,
 575};
 576
 577
 578/*
 579 *  Initialize DHCP/BOOTP extension fields in the request.
 580 */
 581
 582static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
 583
 584#ifdef IPCONFIG_DHCP
 585
 586static void __init
 587ic_dhcp_init_options(u8 *options)
 588{
 589        u8 mt = ((ic_servaddr == NONE)
 590                 ? DHCPDISCOVER : DHCPREQUEST);
 591        u8 *e = options;
 592        int len;
 593
 594#ifdef IPCONFIG_DEBUG
 595        printk("DHCP: Sending message type %d\n", mt);
 596#endif
 597
 598        memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 599        e += 4;
 600
 601        *e++ = 53;              /* DHCP message type */
 602        *e++ = 1;
 603        *e++ = mt;
 604
 605        if (mt == DHCPREQUEST) {
 606                *e++ = 54;      /* Server ID (IP address) */
 607                *e++ = 4;
 608                memcpy(e, &ic_servaddr, 4);
 609                e += 4;
 610
 611                *e++ = 50;      /* Requested IP address */
 612                *e++ = 4;
 613                memcpy(e, &ic_myaddr, 4);
 614                e += 4;
 615        }
 616
 617        /* always? */
 618        {
 619                static const u8 ic_req_params[] = {
 620                        1,      /* Subnet mask */
 621                        3,      /* Default gateway */
 622                        6,      /* DNS server */
 623                        12,     /* Host name */
 624                        15,     /* Domain name */
 625                        17,     /* Boot path */
 626                        40,     /* NIS domain name */
 627                };
 628
 629                *e++ = 55;      /* Parameter request list */
 630                *e++ = sizeof(ic_req_params);
 631                memcpy(e, ic_req_params, sizeof(ic_req_params));
 632                e += sizeof(ic_req_params);
 633
 634                if (*vendor_class_identifier) {
 635                        printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
 636                               vendor_class_identifier);
 637                        *e++ = 60;      /* Class-identifier */
 638                        len = strlen(vendor_class_identifier);
 639                        *e++ = len;
 640                        memcpy(e, vendor_class_identifier, len);
 641                        e += len;
 642                }
 643        }
 644
 645        *e++ = 255;     /* End of the list */
 646}
 647
 648#endif /* IPCONFIG_DHCP */
 649
 650static void __init ic_bootp_init_ext(u8 *e)
 651{
 652        memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 653        e += 4;
 654        *e++ = 1;               /* Subnet mask request */
 655        *e++ = 4;
 656        e += 4;
 657        *e++ = 3;               /* Default gateway request */
 658        *e++ = 4;
 659        e += 4;
 660        *e++ = 5;               /* Name server request */
 661        *e++ = 8;
 662        e += 8;
 663        *e++ = 12;              /* Host name request */
 664        *e++ = 32;
 665        e += 32;
 666        *e++ = 40;              /* NIS Domain name request */
 667        *e++ = 32;
 668        e += 32;
 669        *e++ = 17;              /* Boot path */
 670        *e++ = 40;
 671        e += 40;
 672
 673        *e++ = 57;              /* set extension buffer size for reply */
 674        *e++ = 2;
 675        *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
 676        *e++ = 150;
 677
 678        *e++ = 255;             /* End of the list */
 679}
 680
 681
 682/*
 683 *  Initialize the DHCP/BOOTP mechanism.
 684 */
 685static inline void __init ic_bootp_init(void)
 686{
 687        int i;
 688
 689        for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
 690                ic_nameservers[i] = NONE;
 691
 692        dev_add_pack(&bootp_packet_type);
 693}
 694
 695
 696/*
 697 *  DHCP/BOOTP cleanup.
 698 */
 699static inline void __init ic_bootp_cleanup(void)
 700{
 701        dev_remove_pack(&bootp_packet_type);
 702}
 703
 704
 705/*
 706 *  Send DHCP/BOOTP request to single interface.
 707 */
 708static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
 709{
 710        struct net_device *dev = d->dev;
 711        struct sk_buff *skb;
 712        struct bootp_pkt *b;
 713        struct iphdr *h;
 714
 715        /* Allocate packet */
 716        skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15,
 717                        GFP_KERNEL);
 718        if (!skb)
 719                return;
 720        skb_reserve(skb, LL_RESERVED_SPACE(dev));
 721        b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
 722        memset(b, 0, sizeof(struct bootp_pkt));
 723
 724        /* Construct IP header */
 725        skb_reset_network_header(skb);
 726        h = ip_hdr(skb);
 727        h->version = 4;
 728        h->ihl = 5;
 729        h->tot_len = htons(sizeof(struct bootp_pkt));
 730        h->frag_off = htons(IP_DF);
 731        h->ttl = 64;
 732        h->protocol = IPPROTO_UDP;
 733        h->daddr = htonl(INADDR_BROADCAST);
 734        h->check = ip_fast_csum((unsigned char *) h, h->ihl);
 735
 736        /* Construct UDP header */
 737        b->udph.source = htons(68);
 738        b->udph.dest = htons(67);
 739        b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
 740        /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
 741
 742        /* Construct DHCP/BOOTP header */
 743        b->op = BOOTP_REQUEST;
 744        if (dev->type < 256) /* check for false types */
 745                b->htype = dev->type;
 746        else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */
 747                b->htype = ARPHRD_IEEE802;
 748        else if (dev->type == ARPHRD_FDDI)
 749                b->htype = ARPHRD_ETHER;
 750        else {
 751                printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
 752                b->htype = dev->type; /* can cause undefined behavior */
 753        }
 754
 755        /* server_ip and your_ip address are both already zero per RFC2131 */
 756        b->hlen = dev->addr_len;
 757        memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
 758        b->secs = htons(jiffies_diff / HZ);
 759        b->xid = d->xid;
 760
 761        /* add DHCP options or BOOTP extensions */
 762#ifdef IPCONFIG_DHCP
 763        if (ic_proto_enabled & IC_USE_DHCP)
 764                ic_dhcp_init_options(b->exten);
 765        else
 766#endif
 767                ic_bootp_init_ext(b->exten);
 768
 769        /* Chain packet down the line... */
 770        skb->dev = dev;
 771        skb->protocol = htons(ETH_P_IP);
 772        if (dev_hard_header(skb, dev, ntohs(skb->protocol),
 773                            dev->broadcast, dev->dev_addr, skb->len) < 0 ||
 774            dev_queue_xmit(skb) < 0)
 775                printk("E");
 776}
 777
 778
 779/*
 780 *  Copy BOOTP-supplied string if not already set.
 781 */
 782static int __init ic_bootp_string(char *dest, char *src, int len, int max)
 783{
 784        if (!len)
 785                return 0;
 786        if (len > max-1)
 787                len = max-1;
 788        memcpy(dest, src, len);
 789        dest[len] = '\0';
 790        return 1;
 791}
 792
 793
 794/*
 795 *  Process BOOTP extensions.
 796 */
 797static void __init ic_do_bootp_ext(u8 *ext)
 798{
 799       u8 servers;
 800       int i;
 801
 802#ifdef IPCONFIG_DEBUG
 803        u8 *c;
 804
 805        printk("DHCP/BOOTP: Got extension %d:",*ext);
 806        for (c=ext+2; c<ext+2+ext[1]; c++)
 807                printk(" %02x", *c);
 808        printk("\n");
 809#endif
 810
 811        switch (*ext++) {
 812                case 1:         /* Subnet mask */
 813                        if (ic_netmask == NONE)
 814                                memcpy(&ic_netmask, ext+1, 4);
 815                        break;
 816                case 3:         /* Default gateway */
 817                        if (ic_gateway == NONE)
 818                                memcpy(&ic_gateway, ext+1, 4);
 819                        break;
 820                case 6:         /* DNS server */
 821                        servers= *ext/4;
 822                        if (servers > CONF_NAMESERVERS_MAX)
 823                                servers = CONF_NAMESERVERS_MAX;
 824                        for (i = 0; i < servers; i++) {
 825                                if (ic_nameservers[i] == NONE)
 826                                        memcpy(&ic_nameservers[i], ext+1+4*i, 4);
 827                        }
 828                        break;
 829                case 12:        /* Host name */
 830                        ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN);
 831                        ic_host_name_set = 1;
 832                        break;
 833                case 15:        /* Domain name (DNS) */
 834                        ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
 835                        break;
 836                case 17:        /* Root path */
 837                        if (!root_server_path[0])
 838                                ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
 839                        break;
 840                case 40:        /* NIS Domain name (_not_ DNS) */
 841                        ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN);
 842                        break;
 843        }
 844}
 845
 846
 847/*
 848 *  Receive BOOTP reply.
 849 */
 850static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 851{
 852        struct bootp_pkt *b;
 853        struct iphdr *h;
 854        struct ic_device *d;
 855        int len, ext_len;
 856
 857        if (!net_eq(dev_net(dev), &init_net))
 858                goto drop;
 859
 860        /* Perform verifications before taking the lock.  */
 861        if (skb->pkt_type == PACKET_OTHERHOST)
 862                goto drop;
 863
 864        if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 865                return NET_RX_DROP;
 866
 867        if (!pskb_may_pull(skb,
 868                           sizeof(struct iphdr) +
 869                           sizeof(struct udphdr)))
 870                goto drop;
 871
 872        b = (struct bootp_pkt *)skb_network_header(skb);
 873        h = &b->iph;
 874
 875        if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
 876                goto drop;
 877
 878        /* Fragments are not supported */
 879        if (h->frag_off & htons(IP_OFFSET | IP_MF)) {
 880                if (net_ratelimit())
 881                        printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented "
 882                               "reply.\n");
 883                goto drop;
 884        }
 885
 886        if (skb->len < ntohs(h->tot_len))
 887                goto drop;
 888
 889        if (ip_fast_csum((char *) h, h->ihl))
 890                goto drop;
 891
 892        if (b->udph.source != htons(67) || b->udph.dest != htons(68))
 893                goto drop;
 894
 895        if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
 896                goto drop;
 897
 898        len = ntohs(b->udph.len) - sizeof(struct udphdr);
 899        ext_len = len - (sizeof(*b) -
 900                         sizeof(struct iphdr) -
 901                         sizeof(struct udphdr) -
 902                         sizeof(b->exten));
 903        if (ext_len < 0)
 904                goto drop;
 905
 906        /* Ok the front looks good, make sure we can get at the rest.  */
 907        if (!pskb_may_pull(skb, skb->len))
 908                goto drop;
 909
 910        b = (struct bootp_pkt *)skb_network_header(skb);
 911        h = &b->iph;
 912
 913        /* One reply at a time, please. */
 914        spin_lock(&ic_recv_lock);
 915
 916        /* If we already have a reply, just drop the packet */
 917        if (ic_got_reply)
 918                goto drop_unlock;
 919
 920        /* Find the ic_device that the packet arrived on */
 921        d = ic_first_dev;
 922        while (d && d->dev != dev)
 923                d = d->next;
 924        if (!d)
 925                goto drop_unlock;  /* should never happen */
 926
 927        /* Is it a reply to our BOOTP request? */
 928        if (b->op != BOOTP_REPLY ||
 929            b->xid != d->xid) {
 930                if (net_ratelimit())
 931                        printk(KERN_ERR "DHCP/BOOTP: Reply not for us, "
 932                               "op[%x] xid[%x]\n",
 933                               b->op, b->xid);
 934                goto drop_unlock;
 935        }
 936
 937        /* Is it a reply for the device we are configuring? */
 938        if (b->xid != ic_dev_xid) {
 939                if (net_ratelimit())
 940                        printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet \n");
 941                goto drop_unlock;
 942        }
 943
 944        /* Parse extensions */
 945        if (ext_len >= 4 &&
 946            !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
 947                u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
 948                u8 *ext;
 949
 950#ifdef IPCONFIG_DHCP
 951                if (ic_proto_enabled & IC_USE_DHCP) {
 952                        __be32 server_id = NONE;
 953                        int mt = 0;
 954
 955                        ext = &b->exten[4];
 956                        while (ext < end && *ext != 0xff) {
 957                                u8 *opt = ext++;
 958                                if (*opt == 0)  /* Padding */
 959                                        continue;
 960                                ext += *ext + 1;
 961                                if (ext >= end)
 962                                        break;
 963                                switch (*opt) {
 964                                case 53:        /* Message type */
 965                                        if (opt[1])
 966                                                mt = opt[2];
 967                                        break;
 968                                case 54:        /* Server ID (IP address) */
 969                                        if (opt[1] >= 4)
 970                                                memcpy(&server_id, opt + 2, 4);
 971                                        break;
 972                                }
 973                        }
 974
 975#ifdef IPCONFIG_DEBUG
 976                        printk("DHCP: Got message type %d\n", mt);
 977#endif
 978
 979                        switch (mt) {
 980                        case DHCPOFFER:
 981                                /* While in the process of accepting one offer,
 982                                 * ignore all others.
 983                                 */
 984                                if (ic_myaddr != NONE)
 985                                        goto drop_unlock;
 986
 987                                /* Let's accept that offer. */
 988                                ic_myaddr = b->your_ip;
 989                                ic_servaddr = server_id;
 990#ifdef IPCONFIG_DEBUG
 991                                printk("DHCP: Offered address %pI4 by server %pI4\n",
 992                                       &ic_myaddr, &ic_servaddr);
 993#endif
 994                                /* The DHCP indicated server address takes
 995                                 * precedence over the bootp header one if
 996                                 * they are different.
 997                                 */
 998                                if ((server_id != NONE) &&
 999                                    (b->server_ip != server_id))
1000                                        b->server_ip = ic_servaddr;
1001                                break;
1002
1003                        case DHCPACK:
1004                                if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1005                                        goto drop_unlock;
1006
1007                                /* Yeah! */
1008                                break;
1009
1010                        default:
1011                                /* Urque.  Forget it*/
1012                                ic_myaddr = NONE;
1013                                ic_servaddr = NONE;
1014                                goto drop_unlock;
1015                        }
1016
1017                        ic_dhcp_msgtype = mt;
1018
1019                }
1020#endif /* IPCONFIG_DHCP */
1021
1022                ext = &b->exten[4];
1023                while (ext < end && *ext != 0xff) {
1024                        u8 *opt = ext++;
1025                        if (*opt == 0)  /* Padding */
1026                                continue;
1027                        ext += *ext + 1;
1028                        if (ext < end)
1029                                ic_do_bootp_ext(opt);
1030                }
1031        }
1032
1033        /* We have a winner! */
1034        ic_dev = dev;
1035        ic_myaddr = b->your_ip;
1036        ic_servaddr = b->server_ip;
1037        if (ic_gateway == NONE && b->relay_ip)
1038                ic_gateway = b->relay_ip;
1039        if (ic_nameservers[0] == NONE)
1040                ic_nameservers[0] = ic_servaddr;
1041        ic_got_reply = IC_BOOTP;
1042
1043drop_unlock:
1044        /* Show's over.  Nothing to see here.  */
1045        spin_unlock(&ic_recv_lock);
1046
1047drop:
1048        /* Throw the packet out. */
1049        kfree_skb(skb);
1050
1051        return 0;
1052}
1053
1054
1055#endif
1056
1057
1058/*
1059 *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1060 */
1061
1062#ifdef IPCONFIG_DYNAMIC
1063
1064static int __init ic_dynamic(void)
1065{
1066        int retries;
1067        struct ic_device *d;
1068        unsigned long start_jiffies, timeout, jiff;
1069        int do_bootp = ic_proto_have_if & IC_BOOTP;
1070        int do_rarp = ic_proto_have_if & IC_RARP;
1071
1072        /*
1073         * If none of DHCP/BOOTP/RARP was selected, return with an error.
1074         * This routine gets only called when some pieces of information
1075         * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1076         */
1077        if (!ic_proto_enabled) {
1078                printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1079                return -1;
1080        }
1081
1082#ifdef IPCONFIG_BOOTP
1083        if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1084                printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
1085#endif
1086#ifdef IPCONFIG_RARP
1087        if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1088                printk(KERN_ERR "RARP: No suitable device found.\n");
1089#endif
1090
1091        if (!ic_proto_have_if)
1092                /* Error message already printed */
1093                return -1;
1094
1095        /*
1096         * Setup protocols
1097         */
1098#ifdef IPCONFIG_BOOTP
1099        if (do_bootp)
1100                ic_bootp_init();
1101#endif
1102#ifdef IPCONFIG_RARP
1103        if (do_rarp)
1104                ic_rarp_init();
1105#endif
1106
1107        /*
1108         * Send requests and wait, until we get an answer. This loop
1109         * seems to be a terrible waste of CPU time, but actually there is
1110         * only one process running at all, so we don't need to use any
1111         * scheduler functions.
1112         * [Actually we could now, but the nothing else running note still
1113         *  applies.. - AC]
1114         */
1115        printk(KERN_NOTICE "Sending %s%s%s requests .",
1116               do_bootp
1117                ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1118               (do_bootp && do_rarp) ? " and " : "",
1119               do_rarp ? "RARP" : "");
1120
1121        start_jiffies = jiffies;
1122        d = ic_first_dev;
1123        retries = CONF_SEND_RETRIES;
1124        get_random_bytes(&timeout, sizeof(timeout));
1125        timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
1126        for (;;) {
1127                /* Track the device we are configuring */
1128                ic_dev_xid = d->xid;
1129
1130#ifdef IPCONFIG_BOOTP
1131                if (do_bootp && (d->able & IC_BOOTP))
1132                        ic_bootp_send_if(d, jiffies - start_jiffies);
1133#endif
1134#ifdef IPCONFIG_RARP
1135                if (do_rarp && (d->able & IC_RARP))
1136                        ic_rarp_send_if(d);
1137#endif
1138
1139                jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1140                while (time_before(jiffies, jiff) && !ic_got_reply)
1141                        schedule_timeout_uninterruptible(1);
1142#ifdef IPCONFIG_DHCP
1143                /* DHCP isn't done until we get a DHCPACK. */
1144                if ((ic_got_reply & IC_BOOTP)
1145                    && (ic_proto_enabled & IC_USE_DHCP)
1146                    && ic_dhcp_msgtype != DHCPACK)
1147                {
1148                        ic_got_reply = 0;
1149                        printk(",");
1150                        continue;
1151                }
1152#endif /* IPCONFIG_DHCP */
1153
1154                if (ic_got_reply) {
1155                        printk(" OK\n");
1156                        break;
1157                }
1158
1159                if ((d = d->next))
1160                        continue;
1161
1162                if (! --retries) {
1163                        printk(" timed out!\n");
1164                        break;
1165                }
1166
1167                d = ic_first_dev;
1168
1169                timeout = timeout CONF_TIMEOUT_MULT;
1170                if (timeout > CONF_TIMEOUT_MAX)
1171                        timeout = CONF_TIMEOUT_MAX;
1172
1173                printk(".");
1174        }
1175
1176#ifdef IPCONFIG_BOOTP
1177        if (do_bootp)
1178                ic_bootp_cleanup();
1179#endif
1180#ifdef IPCONFIG_RARP
1181        if (do_rarp)
1182                ic_rarp_cleanup();
1183#endif
1184
1185        if (!ic_got_reply) {
1186                ic_myaddr = NONE;
1187                return -1;
1188        }
1189
1190        printk("IP-Config: Got %s answer from %pI4, ",
1191                ((ic_got_reply & IC_RARP) ? "RARP"
1192                 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1193                &ic_servaddr);
1194        printk("my address is %pI4\n", &ic_myaddr);
1195
1196        return 0;
1197}
1198
1199#endif /* IPCONFIG_DYNAMIC */
1200
1201#ifdef CONFIG_PROC_FS
1202
1203static int pnp_seq_show(struct seq_file *seq, void *v)
1204{
1205        int i;
1206
1207        if (ic_proto_used & IC_PROTO)
1208                seq_printf(seq, "#PROTO: %s\n",
1209                           (ic_proto_used & IC_RARP) ? "RARP"
1210                           : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1211        else
1212                seq_puts(seq, "#MANUAL\n");
1213
1214        if (ic_domain[0])
1215                seq_printf(seq,
1216                           "domain %s\n", ic_domain);
1217        for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1218                if (ic_nameservers[i] != NONE)
1219                        seq_printf(seq, "nameserver %pI4\n",
1220                                   &ic_nameservers[i]);
1221        }
1222        if (ic_servaddr != NONE)
1223                seq_printf(seq, "bootserver %pI4\n",
1224                           &ic_servaddr);
1225        return 0;
1226}
1227
1228static int pnp_seq_open(struct inode *indoe, struct file *file)
1229{
1230        return single_open(file, pnp_seq_show, NULL);
1231}
1232
1233static const struct file_operations pnp_seq_fops = {
1234        .owner          = THIS_MODULE,
1235        .open           = pnp_seq_open,
1236        .read           = seq_read,
1237        .llseek         = seq_lseek,
1238        .release        = single_release,
1239};
1240#endif /* CONFIG_PROC_FS */
1241
1242/*
1243 *  Extract IP address from the parameter string if needed. Note that we
1244 *  need to have root_server_addr set _before_ IPConfig gets called as it
1245 *  can override it.
1246 */
1247__be32 __init root_nfs_parse_addr(char *name)
1248{
1249        __be32 addr;
1250        int octets = 0;
1251        char *cp, *cq;
1252
1253        cp = cq = name;
1254        while (octets < 4) {
1255                while (*cp >= '0' && *cp <= '9')
1256                        cp++;
1257                if (cp == cq || cp - cq > 3)
1258                        break;
1259                if (*cp == '.' || octets == 3)
1260                        octets++;
1261                if (octets < 4)
1262                        cp++;
1263                cq = cp;
1264        }
1265        if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1266                if (*cp == ':')
1267                        *cp++ = '\0';
1268                addr = in_aton(name);
1269                memmove(name, cp, strlen(cp) + 1);
1270        } else
1271                addr = NONE;
1272
1273        return addr;
1274}
1275
1276/*
1277 *      IP Autoconfig dispatcher.
1278 */
1279
1280static int __init ip_auto_config(void)
1281{
1282        __be32 addr;
1283#ifdef IPCONFIG_DYNAMIC
1284        int retries = CONF_OPEN_RETRIES;
1285#endif
1286
1287#ifdef CONFIG_PROC_FS
1288        proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1289#endif /* CONFIG_PROC_FS */
1290
1291        if (!ic_enable)
1292                return 0;
1293
1294        DBG(("IP-Config: Entered.\n"));
1295#ifdef IPCONFIG_DYNAMIC
1296 try_try_again:
1297#endif
1298        /* Give hardware a chance to settle */
1299        msleep(CONF_PRE_OPEN);
1300
1301        /* Setup all network devices */
1302        if (ic_open_devs() < 0)
1303                return -1;
1304
1305        /* Give drivers a chance to settle */
1306        ssleep(CONF_POST_OPEN);
1307
1308        /*
1309         * If the config information is insufficient (e.g., our IP address or
1310         * IP address of the boot server is missing or we have multiple network
1311         * interfaces and no default was set), use BOOTP or RARP to get the
1312         * missing values.
1313         */
1314        if (ic_myaddr == NONE ||
1315#ifdef CONFIG_ROOT_NFS
1316            (root_server_addr == NONE
1317             && ic_servaddr == NONE
1318             && ROOT_DEV == Root_NFS) ||
1319#endif
1320            ic_first_dev->next) {
1321#ifdef IPCONFIG_DYNAMIC
1322                if (ic_dynamic() < 0) {
1323                        ic_close_devs();
1324
1325                        /*
1326                         * I don't know why, but sometimes the
1327                         * eepro100 driver (at least) gets upset and
1328                         * doesn't work the first time it's opened.
1329                         * But then if you close it and reopen it, it
1330                         * works just fine.  So we need to try that at
1331                         * least once before giving up.
1332                         *
1333                         * Also, if the root will be NFS-mounted, we
1334                         * have nowhere to go if DHCP fails.  So we
1335                         * just have to keep trying forever.
1336                         *
1337                         *                              -- Chip
1338                         */
1339#ifdef CONFIG_ROOT_NFS
1340                        if (ROOT_DEV ==  Root_NFS) {
1341                                printk(KERN_ERR
1342                                        "IP-Config: Retrying forever (NFS root)...\n");
1343                                goto try_try_again;
1344                        }
1345#endif
1346
1347                        if (--retries) {
1348                                printk(KERN_ERR
1349                                       "IP-Config: Reopening network devices...\n");
1350                                goto try_try_again;
1351                        }
1352
1353                        /* Oh, well.  At least we tried. */
1354                        printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
1355                        return -1;
1356                }
1357#else /* !DYNAMIC */
1358                printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
1359                ic_close_devs();
1360                return -1;
1361#endif /* IPCONFIG_DYNAMIC */
1362        } else {
1363                /* Device selected manually or only one device -> use it */
1364                ic_dev = ic_first_dev->dev;
1365        }
1366
1367        addr = root_nfs_parse_addr(root_server_path);
1368        if (root_server_addr == NONE)
1369                root_server_addr = addr;
1370
1371        /*
1372         * Use defaults whereever applicable.
1373         */
1374        if (ic_defaults() < 0)
1375                return -1;
1376
1377        /*
1378         * Close all network devices except the device we've
1379         * autoconfigured and set up routes.
1380         */
1381        ic_close_devs();
1382        if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1383                return -1;
1384
1385        /*
1386         * Record which protocol was actually used.
1387         */
1388#ifdef IPCONFIG_DYNAMIC
1389        ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1390#endif
1391
1392#ifndef IPCONFIG_SILENT
1393        /*
1394         * Clue in the operator.
1395         */
1396        printk("IP-Config: Complete:");
1397        printk("\n     device=%s", ic_dev->name);
1398        printk(", addr=%pI4", &ic_myaddr);
1399        printk(", mask=%pI4", &ic_netmask);
1400        printk(", gw=%pI4", &ic_gateway);
1401        printk(",\n     host=%s, domain=%s, nis-domain=%s",
1402               utsname()->nodename, ic_domain, utsname()->domainname);
1403        printk(",\n     bootserver=%pI4", &ic_servaddr);
1404        printk(", rootserver=%pI4", &root_server_addr);
1405        printk(", rootpath=%s", root_server_path);
1406        printk("\n");
1407#endif /* !SILENT */
1408
1409        return 0;
1410}
1411
1412late_initcall(ip_auto_config);
1413
1414
1415/*
1416 *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1417 *  command line parameter.  See Documentation/filesystems/nfsroot.txt.
1418 */
1419static int __init ic_proto_name(char *name)
1420{
1421        if (!strcmp(name, "on") || !strcmp(name, "any")) {
1422                return 1;
1423        }
1424        if (!strcmp(name, "off") || !strcmp(name, "none")) {
1425                return 0;
1426        }
1427#ifdef CONFIG_IP_PNP_DHCP
1428        else if (!strcmp(name, "dhcp")) {
1429                ic_proto_enabled &= ~IC_RARP;
1430                return 1;
1431        }
1432#endif
1433#ifdef CONFIG_IP_PNP_BOOTP
1434        else if (!strcmp(name, "bootp")) {
1435                ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1436                return 1;
1437        }
1438#endif
1439#ifdef CONFIG_IP_PNP_RARP
1440        else if (!strcmp(name, "rarp")) {
1441                ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1442                return 1;
1443        }
1444#endif
1445#ifdef IPCONFIG_DYNAMIC
1446        else if (!strcmp(name, "both")) {
1447                ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1448                return 1;
1449        }
1450#endif
1451        return 0;
1452}
1453
1454static int __init ip_auto_config_setup(char *addrs)
1455{
1456        char *cp, *ip, *dp;
1457        int num = 0;
1458
1459        ic_set_manually = 1;
1460        ic_enable = 1;
1461
1462        /*
1463         * If any dhcp, bootp etc options are set, leave autoconfig on
1464         * and skip the below static IP processing.
1465         */
1466        if (ic_proto_name(addrs))
1467                return 1;
1468
1469        /* If no static IP is given, turn off autoconfig and bail.  */
1470        if (*addrs == 0 ||
1471            strcmp(addrs, "off") == 0 ||
1472            strcmp(addrs, "none") == 0) {
1473                ic_enable = 0;
1474                return 1;
1475        }
1476
1477        /* Parse string for static IP assignment.  */
1478        ip = addrs;
1479        while (ip && *ip) {
1480                if ((cp = strchr(ip, ':')))
1481                        *cp++ = '\0';
1482                if (strlen(ip) > 0) {
1483                        DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1484                        switch (num) {
1485                        case 0:
1486                                if ((ic_myaddr = in_aton(ip)) == ANY)
1487                                        ic_myaddr = NONE;
1488                                break;
1489                        case 1:
1490                                if ((ic_servaddr = in_aton(ip)) == ANY)
1491                                        ic_servaddr = NONE;
1492                                break;
1493                        case 2:
1494                                if ((ic_gateway = in_aton(ip)) == ANY)
1495                                        ic_gateway = NONE;
1496                                break;
1497                        case 3:
1498                                if ((ic_netmask = in_aton(ip)) == ANY)
1499                                        ic_netmask = NONE;
1500                                break;
1501                        case 4:
1502                                if ((dp = strchr(ip, '.'))) {
1503                                        *dp++ = '\0';
1504                                        strlcpy(utsname()->domainname, dp,
1505                                                sizeof(utsname()->domainname));
1506                                }
1507                                strlcpy(utsname()->nodename, ip,
1508                                        sizeof(utsname()->nodename));
1509                                ic_host_name_set = 1;
1510                                break;
1511                        case 5:
1512                                strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1513                                break;
1514                        case 6:
1515                                if (ic_proto_name(ip) == 0 &&
1516                                    ic_myaddr == NONE) {
1517                                        ic_enable = 0;
1518                                }
1519                                break;
1520                        }
1521                }
1522                ip = cp;
1523                num++;
1524        }
1525
1526        return 1;
1527}
1528
1529static int __init nfsaddrs_config_setup(char *addrs)
1530{
1531        return ip_auto_config_setup(addrs);
1532}
1533
1534static int __init vendor_class_identifier_setup(char *addrs)
1535{
1536        if (strlcpy(vendor_class_identifier, addrs,
1537                    sizeof(vendor_class_identifier))
1538            >= sizeof(vendor_class_identifier))
1539                printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"",
1540                       vendor_class_identifier);
1541        return 1;
1542}
1543
1544__setup("ip=", ip_auto_config_setup);
1545__setup("nfsaddrs=", nfsaddrs_config_setup);
1546__setup("dhcpclass=", vendor_class_identifier_setup);
1547