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 <linux/export.h>
  58#include <net/net_namespace.h>
  59#include <net/arp.h>
  60#include <net/ip.h>
  61#include <net/ipconfig.h>
  62#include <net/route.h>
  63
  64#include <asm/uaccess.h>
  65#include <net/checksum.h>
  66#include <asm/processor.h>
  67
  68/* Define this to allow debugging output */
  69#undef IPCONFIG_DEBUG
  70
  71#ifdef IPCONFIG_DEBUG
  72#define DBG(x) printk x
  73#else
  74#define DBG(x) do { } while(0)
  75#endif
  76
  77#if defined(CONFIG_IP_PNP_DHCP)
  78#define IPCONFIG_DHCP
  79#endif
  80#if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
  81#define IPCONFIG_BOOTP
  82#endif
  83#if defined(CONFIG_IP_PNP_RARP)
  84#define IPCONFIG_RARP
  85#endif
  86#if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
  87#define IPCONFIG_DYNAMIC
  88#endif
  89
  90/* Define the friendly delay before and after opening net devices */
  91#define CONF_POST_OPEN          10      /* After opening: 10 msecs */
  92#define CONF_CARRIER_TIMEOUT    120000  /* Wait for carrier timeout */
  93
  94/* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
  95#define CONF_OPEN_RETRIES       2       /* (Re)open devices twice */
  96#define CONF_SEND_RETRIES       6       /* Send six requests per open */
  97#define CONF_INTER_TIMEOUT      (HZ/2)  /* Inter-device timeout: 1/2 second */
  98#define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
  99#define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
 100#define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
 101#define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
 102#define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
 103                                           - '3' from resolv.h */
 104
 105#define NONE cpu_to_be32(INADDR_NONE)
 106#define ANY cpu_to_be32(INADDR_ANY)
 107
 108/*
 109 * Public IP configuration
 110 */
 111
 112/* This is used by platforms which might be able to set the ipconfig
 113 * variables using firmware environment vars.  If this is set, it will
 114 * ignore such firmware variables.
 115 */
 116int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
 117
 118static int ic_enable __initdata = 0;            /* IP config enabled? */
 119
 120/* Protocol choice */
 121int ic_proto_enabled __initdata = 0
 122#ifdef IPCONFIG_BOOTP
 123                        | IC_BOOTP
 124#endif
 125#ifdef CONFIG_IP_PNP_DHCP
 126                        | IC_USE_DHCP
 127#endif
 128#ifdef IPCONFIG_RARP
 129                        | IC_RARP
 130#endif
 131                        ;
 132
 133static int ic_host_name_set __initdata = 0;     /* Host name set by us? */
 134
 135__be32 ic_myaddr = NONE;                /* My IP address */
 136static __be32 ic_netmask = NONE;        /* Netmask for local subnet */
 137__be32 ic_gateway = NONE;       /* Gateway IP address */
 138
 139__be32 ic_servaddr = NONE;      /* Boot server IP address */
 140
 141__be32 root_server_addr = NONE; /* Address of NFS server */
 142u8 root_server_path[256] = { 0, };      /* Path to mount as root */
 143
 144__be32 ic_dev_xid;              /* Device under configuration */
 145
 146/* vendor class identifier */
 147static char vendor_class_identifier[253] __initdata;
 148
 149/* Persistent data: */
 150
 151static int ic_proto_used;                       /* Protocol used, if any */
 152static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
 153static u8 ic_domain[64];                /* DNS (not NIS) domain name */
 154
 155/*
 156 * Private state.
 157 */
 158
 159/* Name of user-selected boot device */
 160static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
 161
 162/* Protocols supported by available interfaces */
 163static int ic_proto_have_if __initdata = 0;
 164
 165/* MTU for boot device */
 166static int ic_dev_mtu __initdata = 0;
 167
 168#ifdef IPCONFIG_DYNAMIC
 169static DEFINE_SPINLOCK(ic_recv_lock);
 170static volatile int ic_got_reply __initdata = 0;    /* Proto(s) that replied */
 171#endif
 172#ifdef IPCONFIG_DHCP
 173static int ic_dhcp_msgtype __initdata = 0;      /* DHCP msg type received */
 174#endif
 175
 176
 177/*
 178 *      Network devices
 179 */
 180
 181struct ic_device {
 182        struct ic_device *next;
 183        struct net_device *dev;
 184        unsigned short flags;
 185        short able;
 186        __be32 xid;
 187};
 188
 189static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
 190static struct net_device *ic_dev __initdata = NULL;     /* Selected device */
 191
 192static bool __init ic_is_init_dev(struct net_device *dev)
 193{
 194        if (dev->flags & IFF_LOOPBACK)
 195                return false;
 196        return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
 197            (!(dev->flags & IFF_LOOPBACK) &&
 198             (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
 199             strncmp(dev->name, "dummy", 5));
 200}
 201
 202static int __init ic_open_devs(void)
 203{
 204        struct ic_device *d, **last;
 205        struct net_device *dev;
 206        unsigned short oflags;
 207        unsigned long start;
 208
 209        last = &ic_first_dev;
 210        rtnl_lock();
 211
 212        /* bring loopback device up first */
 213        for_each_netdev(&init_net, dev) {
 214                if (!(dev->flags & IFF_LOOPBACK))
 215                        continue;
 216                if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
 217                        pr_err("IP-Config: Failed to open %s\n", dev->name);
 218        }
 219
 220        for_each_netdev(&init_net, dev) {
 221                if (ic_is_init_dev(dev)) {
 222                        int able = 0;
 223                        if (dev->mtu >= 364)
 224                                able |= IC_BOOTP;
 225                        else
 226                                pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small",
 227                                        dev->name, dev->mtu);
 228                        if (!(dev->flags & IFF_NOARP))
 229                                able |= IC_RARP;
 230                        able &= ic_proto_enabled;
 231                        if (ic_proto_enabled && !able)
 232                                continue;
 233                        oflags = dev->flags;
 234                        if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
 235                                pr_err("IP-Config: Failed to open %s\n",
 236                                       dev->name);
 237                                continue;
 238                        }
 239                        if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
 240                                rtnl_unlock();
 241                                return -ENOMEM;
 242                        }
 243                        d->dev = dev;
 244                        *last = d;
 245                        last = &d->next;
 246                        d->flags = oflags;
 247                        d->able = able;
 248                        if (able & IC_BOOTP)
 249                                get_random_bytes(&d->xid, sizeof(__be32));
 250                        else
 251                                d->xid = 0;
 252                        ic_proto_have_if |= able;
 253                        DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
 254                                dev->name, able, d->xid));
 255                }
 256        }
 257
 258        /* no point in waiting if we could not bring up at least one device */
 259        if (!ic_first_dev)
 260                goto have_carrier;
 261
 262        /* wait for a carrier on at least one device */
 263        start = jiffies;
 264        while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) {
 265                for_each_netdev(&init_net, dev)
 266                        if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
 267                                goto have_carrier;
 268
 269                msleep(1);
 270        }
 271have_carrier:
 272        rtnl_unlock();
 273
 274        *last = NULL;
 275
 276        if (!ic_first_dev) {
 277                if (user_dev_name[0])
 278                        pr_err("IP-Config: Device `%s' not found\n",
 279                               user_dev_name);
 280                else
 281                        pr_err("IP-Config: No network devices available\n");
 282                return -ENODEV;
 283        }
 284        return 0;
 285}
 286
 287static void __init ic_close_devs(void)
 288{
 289        struct ic_device *d, *next;
 290        struct net_device *dev;
 291
 292        rtnl_lock();
 293        next = ic_first_dev;
 294        while ((d = next)) {
 295                next = d->next;
 296                dev = d->dev;
 297                if (dev != ic_dev) {
 298                        DBG(("IP-Config: Downing %s\n", dev->name));
 299                        dev_change_flags(dev, d->flags);
 300                }
 301                kfree(d);
 302        }
 303        rtnl_unlock();
 304}
 305
 306/*
 307 *      Interface to various network functions.
 308 */
 309
 310static inline void
 311set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
 312{
 313        sin->sin_family = AF_INET;
 314        sin->sin_addr.s_addr = addr;
 315        sin->sin_port = port;
 316}
 317
 318static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
 319{
 320        int res;
 321
 322        mm_segment_t oldfs = get_fs();
 323        set_fs(get_ds());
 324        res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
 325        set_fs(oldfs);
 326        return res;
 327}
 328
 329static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
 330{
 331        int res;
 332
 333        mm_segment_t oldfs = get_fs();
 334        set_fs(get_ds());
 335        res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
 336        set_fs(oldfs);
 337        return res;
 338}
 339
 340static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
 341{
 342        int res;
 343
 344        mm_segment_t oldfs = get_fs();
 345        set_fs(get_ds());
 346        res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
 347        set_fs(oldfs);
 348        return res;
 349}
 350
 351/*
 352 *      Set up interface addresses and routes.
 353 */
 354
 355static int __init ic_setup_if(void)
 356{
 357        struct ifreq ir;
 358        struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
 359        int err;
 360
 361        memset(&ir, 0, sizeof(ir));
 362        strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
 363        set_sockaddr(sin, ic_myaddr, 0);
 364        if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
 365                pr_err("IP-Config: Unable to set interface address (%d)\n",
 366                       err);
 367                return -1;
 368        }
 369        set_sockaddr(sin, ic_netmask, 0);
 370        if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
 371                pr_err("IP-Config: Unable to set interface netmask (%d)\n",
 372                       err);
 373                return -1;
 374        }
 375        set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
 376        if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
 377                pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
 378                       err);
 379                return -1;
 380        }
 381        /* Handle the case where we need non-standard MTU on the boot link (a network
 382         * using jumbo frames, for instance).  If we can't set the mtu, don't error
 383         * out, we'll try to muddle along.
 384         */
 385        if (ic_dev_mtu != 0) {
 386                strcpy(ir.ifr_name, ic_dev->name);
 387                ir.ifr_mtu = ic_dev_mtu;
 388                if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
 389                        pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
 390                               ic_dev_mtu, err);
 391        }
 392        return 0;
 393}
 394
 395static int __init ic_setup_routes(void)
 396{
 397        /* No need to setup device routes, only the default route... */
 398
 399        if (ic_gateway != NONE) {
 400                struct rtentry rm;
 401                int err;
 402
 403                memset(&rm, 0, sizeof(rm));
 404                if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
 405                        pr_err("IP-Config: Gateway not on directly connected network\n");
 406                        return -1;
 407                }
 408                set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
 409                set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
 410                set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
 411                rm.rt_flags = RTF_UP | RTF_GATEWAY;
 412                if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
 413                        pr_err("IP-Config: Cannot add default route (%d)\n",
 414                               err);
 415                        return -1;
 416                }
 417        }
 418
 419        return 0;
 420}
 421
 422/*
 423 *      Fill in default values for all missing parameters.
 424 */
 425
 426static int __init ic_defaults(void)
 427{
 428        /*
 429         *      At this point we have no userspace running so need not
 430         *      claim locks on system_utsname
 431         */
 432
 433        if (!ic_host_name_set)
 434                sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
 435
 436        if (root_server_addr == NONE)
 437                root_server_addr = ic_servaddr;
 438
 439        if (ic_netmask == NONE) {
 440                if (IN_CLASSA(ntohl(ic_myaddr)))
 441                        ic_netmask = htonl(IN_CLASSA_NET);
 442                else if (IN_CLASSB(ntohl(ic_myaddr)))
 443                        ic_netmask = htonl(IN_CLASSB_NET);
 444                else if (IN_CLASSC(ntohl(ic_myaddr)))
 445                        ic_netmask = htonl(IN_CLASSC_NET);
 446                else {
 447                        pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
 448                               &ic_myaddr);
 449                        return -1;
 450                }
 451                printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
 452        }
 453
 454        return 0;
 455}
 456
 457/*
 458 *      RARP support.
 459 */
 460
 461#ifdef IPCONFIG_RARP
 462
 463static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 464
 465static struct packet_type rarp_packet_type __initdata = {
 466        .type = cpu_to_be16(ETH_P_RARP),
 467        .func = ic_rarp_recv,
 468};
 469
 470static inline void __init ic_rarp_init(void)
 471{
 472        dev_add_pack(&rarp_packet_type);
 473}
 474
 475static inline void __init ic_rarp_cleanup(void)
 476{
 477        dev_remove_pack(&rarp_packet_type);
 478}
 479
 480/*
 481 *  Process received RARP packet.
 482 */
 483static int __init
 484ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 485{
 486        struct arphdr *rarp;
 487        unsigned char *rarp_ptr;
 488        __be32 sip, tip;
 489        unsigned char *sha, *tha;               /* s for "source", t for "target" */
 490        struct ic_device *d;
 491
 492        if (!net_eq(dev_net(dev), &init_net))
 493                goto drop;
 494
 495        if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 496                return NET_RX_DROP;
 497
 498        if (!pskb_may_pull(skb, sizeof(struct arphdr)))
 499                goto drop;
 500
 501        /* Basic sanity checks can be done without the lock.  */
 502        rarp = (struct arphdr *)skb_transport_header(skb);
 503
 504        /* If this test doesn't pass, it's not IP, or we should
 505         * ignore it anyway.
 506         */
 507        if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
 508                goto drop;
 509
 510        /* If it's not a RARP reply, delete it. */
 511        if (rarp->ar_op != htons(ARPOP_RREPLY))
 512                goto drop;
 513
 514        /* If it's not Ethernet, delete it. */
 515        if (rarp->ar_pro != htons(ETH_P_IP))
 516                goto drop;
 517
 518        if (!pskb_may_pull(skb, arp_hdr_len(dev)))
 519                goto drop;
 520
 521        /* OK, it is all there and looks valid, process... */
 522        rarp = (struct arphdr *)skb_transport_header(skb);
 523        rarp_ptr = (unsigned char *) (rarp + 1);
 524
 525        /* One reply at a time, please. */
 526        spin_lock(&ic_recv_lock);
 527
 528        /* If we already have a reply, just drop the packet */
 529        if (ic_got_reply)
 530                goto drop_unlock;
 531
 532        /* Find the ic_device that the packet arrived on */
 533        d = ic_first_dev;
 534        while (d && d->dev != dev)
 535                d = d->next;
 536        if (!d)
 537                goto drop_unlock;       /* should never happen */
 538
 539        /* Extract variable-width fields */
 540        sha = rarp_ptr;
 541        rarp_ptr += dev->addr_len;
 542        memcpy(&sip, rarp_ptr, 4);
 543        rarp_ptr += 4;
 544        tha = rarp_ptr;
 545        rarp_ptr += dev->addr_len;
 546        memcpy(&tip, rarp_ptr, 4);
 547
 548        /* Discard packets which are not meant for us. */
 549        if (memcmp(tha, dev->dev_addr, dev->addr_len))
 550                goto drop_unlock;
 551
 552        /* Discard packets which are not from specified server. */
 553        if (ic_servaddr != NONE && ic_servaddr != sip)
 554                goto drop_unlock;
 555
 556        /* We have a winner! */
 557        ic_dev = dev;
 558        if (ic_myaddr == NONE)
 559                ic_myaddr = tip;
 560        ic_servaddr = sip;
 561        ic_got_reply = IC_RARP;
 562
 563drop_unlock:
 564        /* Show's over.  Nothing to see here.  */
 565        spin_unlock(&ic_recv_lock);
 566
 567drop:
 568        /* Throw the packet out. */
 569        kfree_skb(skb);
 570        return 0;
 571}
 572
 573
 574/*
 575 *  Send RARP request packet over a single interface.
 576 */
 577static void __init ic_rarp_send_if(struct ic_device *d)
 578{
 579        struct net_device *dev = d->dev;
 580        arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
 581                 dev->dev_addr, dev->dev_addr);
 582}
 583#endif
 584
 585/*
 586 *      DHCP/BOOTP support.
 587 */
 588
 589#ifdef IPCONFIG_BOOTP
 590
 591struct bootp_pkt {              /* BOOTP packet format */
 592        struct iphdr iph;       /* IP header */
 593        struct udphdr udph;     /* UDP header */
 594        u8 op;                  /* 1=request, 2=reply */
 595        u8 htype;               /* HW address type */
 596        u8 hlen;                /* HW address length */
 597        u8 hops;                /* Used only by gateways */
 598        __be32 xid;             /* Transaction ID */
 599        __be16 secs;            /* Seconds since we started */
 600        __be16 flags;           /* Just what it says */
 601        __be32 client_ip;               /* Client's IP address if known */
 602        __be32 your_ip;         /* Assigned IP address */
 603        __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
 604        __be32 relay_ip;                /* IP address of BOOTP relay */
 605        u8 hw_addr[16];         /* Client's HW address */
 606        u8 serv_name[64];       /* Server host name */
 607        u8 boot_file[128];      /* Name of boot file */
 608        u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
 609};
 610
 611/* packet ops */
 612#define BOOTP_REQUEST   1
 613#define BOOTP_REPLY     2
 614
 615/* DHCP message types */
 616#define DHCPDISCOVER    1
 617#define DHCPOFFER       2
 618#define DHCPREQUEST     3
 619#define DHCPDECLINE     4
 620#define DHCPACK         5
 621#define DHCPNAK         6
 622#define DHCPRELEASE     7
 623#define DHCPINFORM      8
 624
 625static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 626
 627static struct packet_type bootp_packet_type __initdata = {
 628        .type = cpu_to_be16(ETH_P_IP),
 629        .func = ic_bootp_recv,
 630};
 631
 632
 633/*
 634 *  Initialize DHCP/BOOTP extension fields in the request.
 635 */
 636
 637static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
 638
 639#ifdef IPCONFIG_DHCP
 640
 641static void __init
 642ic_dhcp_init_options(u8 *options)
 643{
 644        u8 mt = ((ic_servaddr == NONE)
 645                 ? DHCPDISCOVER : DHCPREQUEST);
 646        u8 *e = options;
 647        int len;
 648
 649#ifdef IPCONFIG_DEBUG
 650        printk("DHCP: Sending message type %d\n", mt);
 651#endif
 652
 653        memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 654        e += 4;
 655
 656        *e++ = 53;              /* DHCP message type */
 657        *e++ = 1;
 658        *e++ = mt;
 659
 660        if (mt == DHCPREQUEST) {
 661                *e++ = 54;      /* Server ID (IP address) */
 662                *e++ = 4;
 663                memcpy(e, &ic_servaddr, 4);
 664                e += 4;
 665
 666                *e++ = 50;      /* Requested IP address */
 667                *e++ = 4;
 668                memcpy(e, &ic_myaddr, 4);
 669                e += 4;
 670        }
 671
 672        /* always? */
 673        {
 674                static const u8 ic_req_params[] = {
 675                        1,      /* Subnet mask */
 676                        3,      /* Default gateway */
 677                        6,      /* DNS server */
 678                        12,     /* Host name */
 679                        15,     /* Domain name */
 680                        17,     /* Boot path */
 681                        26,     /* MTU */
 682                        40,     /* NIS domain name */
 683                };
 684
 685                *e++ = 55;      /* Parameter request list */
 686                *e++ = sizeof(ic_req_params);
 687                memcpy(e, ic_req_params, sizeof(ic_req_params));
 688                e += sizeof(ic_req_params);
 689
 690                if (ic_host_name_set) {
 691                        *e++ = 12;      /* host-name */
 692                        len = strlen(utsname()->nodename);
 693                        *e++ = len;
 694                        memcpy(e, utsname()->nodename, len);
 695                        e += len;
 696                }
 697                if (*vendor_class_identifier) {
 698                        pr_info("DHCP: sending class identifier \"%s\"\n",
 699                                vendor_class_identifier);
 700                        *e++ = 60;      /* Class-identifier */
 701                        len = strlen(vendor_class_identifier);
 702                        *e++ = len;
 703                        memcpy(e, vendor_class_identifier, len);
 704                        e += len;
 705                }
 706        }
 707
 708        *e++ = 255;     /* End of the list */
 709}
 710
 711#endif /* IPCONFIG_DHCP */
 712
 713static void __init ic_bootp_init_ext(u8 *e)
 714{
 715        memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 716        e += 4;
 717        *e++ = 1;               /* Subnet mask request */
 718        *e++ = 4;
 719        e += 4;
 720        *e++ = 3;               /* Default gateway request */
 721        *e++ = 4;
 722        e += 4;
 723        *e++ = 5;               /* Name server request */
 724        *e++ = 8;
 725        e += 8;
 726        *e++ = 12;              /* Host name request */
 727        *e++ = 32;
 728        e += 32;
 729        *e++ = 40;              /* NIS Domain name request */
 730        *e++ = 32;
 731        e += 32;
 732        *e++ = 17;              /* Boot path */
 733        *e++ = 40;
 734        e += 40;
 735
 736        *e++ = 57;              /* set extension buffer size for reply */
 737        *e++ = 2;
 738        *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
 739        *e++ = 150;
 740
 741        *e++ = 255;             /* End of the list */
 742}
 743
 744
 745/*
 746 *  Initialize the DHCP/BOOTP mechanism.
 747 */
 748static inline void __init ic_bootp_init(void)
 749{
 750        int i;
 751
 752        for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
 753                ic_nameservers[i] = NONE;
 754
 755        dev_add_pack(&bootp_packet_type);
 756}
 757
 758
 759/*
 760 *  DHCP/BOOTP cleanup.
 761 */
 762static inline void __init ic_bootp_cleanup(void)
 763{
 764        dev_remove_pack(&bootp_packet_type);
 765}
 766
 767
 768/*
 769 *  Send DHCP/BOOTP request to single interface.
 770 */
 771static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
 772{
 773        struct net_device *dev = d->dev;
 774        struct sk_buff *skb;
 775        struct bootp_pkt *b;
 776        struct iphdr *h;
 777        int hlen = LL_RESERVED_SPACE(dev);
 778        int tlen = dev->needed_tailroom;
 779
 780        /* Allocate packet */
 781        skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
 782                        GFP_KERNEL);
 783        if (!skb)
 784                return;
 785        skb_reserve(skb, hlen);
 786        b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
 787        memset(b, 0, sizeof(struct bootp_pkt));
 788
 789        /* Construct IP header */
 790        skb_reset_network_header(skb);
 791        h = ip_hdr(skb);
 792        h->version = 4;
 793        h->ihl = 5;
 794        h->tot_len = htons(sizeof(struct bootp_pkt));
 795        h->frag_off = htons(IP_DF);
 796        h->ttl = 64;
 797        h->protocol = IPPROTO_UDP;
 798        h->daddr = htonl(INADDR_BROADCAST);
 799        h->check = ip_fast_csum((unsigned char *) h, h->ihl);
 800
 801        /* Construct UDP header */
 802        b->udph.source = htons(68);
 803        b->udph.dest = htons(67);
 804        b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
 805        /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
 806
 807        /* Construct DHCP/BOOTP header */
 808        b->op = BOOTP_REQUEST;
 809        if (dev->type < 256) /* check for false types */
 810                b->htype = dev->type;
 811        else if (dev->type == ARPHRD_FDDI)
 812                b->htype = ARPHRD_ETHER;
 813        else {
 814                printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
 815                b->htype = dev->type; /* can cause undefined behavior */
 816        }
 817
 818        /* server_ip and your_ip address are both already zero per RFC2131 */
 819        b->hlen = dev->addr_len;
 820        memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
 821        b->secs = htons(jiffies_diff / HZ);
 822        b->xid = d->xid;
 823
 824        /* add DHCP options or BOOTP extensions */
 825#ifdef IPCONFIG_DHCP
 826        if (ic_proto_enabled & IC_USE_DHCP)
 827                ic_dhcp_init_options(b->exten);
 828        else
 829#endif
 830                ic_bootp_init_ext(b->exten);
 831
 832        /* Chain packet down the line... */
 833        skb->dev = dev;
 834        skb->protocol = htons(ETH_P_IP);
 835        if (dev_hard_header(skb, dev, ntohs(skb->protocol),
 836                            dev->broadcast, dev->dev_addr, skb->len) < 0) {
 837                kfree_skb(skb);
 838                printk("E");
 839                return;
 840        }
 841
 842        if (dev_queue_xmit(skb) < 0)
 843                printk("E");
 844}
 845
 846
 847/*
 848 *  Copy BOOTP-supplied string if not already set.
 849 */
 850static int __init ic_bootp_string(char *dest, char *src, int len, int max)
 851{
 852        if (!len)
 853                return 0;
 854        if (len > max-1)
 855                len = max-1;
 856        memcpy(dest, src, len);
 857        dest[len] = '\0';
 858        return 1;
 859}
 860
 861
 862/*
 863 *  Process BOOTP extensions.
 864 */
 865static void __init ic_do_bootp_ext(u8 *ext)
 866{
 867        u8 servers;
 868        int i;
 869        __be16 mtu;
 870
 871#ifdef IPCONFIG_DEBUG
 872        u8 *c;
 873
 874        printk("DHCP/BOOTP: Got extension %d:",*ext);
 875        for (c=ext+2; c<ext+2+ext[1]; c++)
 876                printk(" %02x", *c);
 877        printk("\n");
 878#endif
 879
 880        switch (*ext++) {
 881        case 1:         /* Subnet mask */
 882                if (ic_netmask == NONE)
 883                        memcpy(&ic_netmask, ext+1, 4);
 884                break;
 885        case 3:         /* Default gateway */
 886                if (ic_gateway == NONE)
 887                        memcpy(&ic_gateway, ext+1, 4);
 888                break;
 889        case 6:         /* DNS server */
 890                servers= *ext/4;
 891                if (servers > CONF_NAMESERVERS_MAX)
 892                        servers = CONF_NAMESERVERS_MAX;
 893                for (i = 0; i < servers; i++) {
 894                        if (ic_nameservers[i] == NONE)
 895                                memcpy(&ic_nameservers[i], ext+1+4*i, 4);
 896                }
 897                break;
 898        case 12:        /* Host name */
 899                ic_bootp_string(utsname()->nodename, ext+1, *ext,
 900                                __NEW_UTS_LEN);
 901                ic_host_name_set = 1;
 902                break;
 903        case 15:        /* Domain name (DNS) */
 904                ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
 905                break;
 906        case 17:        /* Root path */
 907                if (!root_server_path[0])
 908                        ic_bootp_string(root_server_path, ext+1, *ext,
 909                                        sizeof(root_server_path));
 910                break;
 911        case 26:        /* Interface MTU */
 912                memcpy(&mtu, ext+1, sizeof(mtu));
 913                ic_dev_mtu = ntohs(mtu);
 914                break;
 915        case 40:        /* NIS Domain name (_not_ DNS) */
 916                ic_bootp_string(utsname()->domainname, ext+1, *ext,
 917                                __NEW_UTS_LEN);
 918                break;
 919        }
 920}
 921
 922
 923/*
 924 *  Receive BOOTP reply.
 925 */
 926static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 927{
 928        struct bootp_pkt *b;
 929        struct iphdr *h;
 930        struct ic_device *d;
 931        int len, ext_len;
 932
 933        if (!net_eq(dev_net(dev), &init_net))
 934                goto drop;
 935
 936        /* Perform verifications before taking the lock.  */
 937        if (skb->pkt_type == PACKET_OTHERHOST)
 938                goto drop;
 939
 940        if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 941                return NET_RX_DROP;
 942
 943        if (!pskb_may_pull(skb,
 944                           sizeof(struct iphdr) +
 945                           sizeof(struct udphdr)))
 946                goto drop;
 947
 948        b = (struct bootp_pkt *)skb_network_header(skb);
 949        h = &b->iph;
 950
 951        if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
 952                goto drop;
 953
 954        /* Fragments are not supported */
 955        if (ip_is_fragment(h)) {
 956                net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
 957                goto drop;
 958        }
 959
 960        if (skb->len < ntohs(h->tot_len))
 961                goto drop;
 962
 963        if (ip_fast_csum((char *) h, h->ihl))
 964                goto drop;
 965
 966        if (b->udph.source != htons(67) || b->udph.dest != htons(68))
 967                goto drop;
 968
 969        if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
 970                goto drop;
 971
 972        len = ntohs(b->udph.len) - sizeof(struct udphdr);
 973        ext_len = len - (sizeof(*b) -
 974                         sizeof(struct iphdr) -
 975                         sizeof(struct udphdr) -
 976                         sizeof(b->exten));
 977        if (ext_len < 0)
 978                goto drop;
 979
 980        /* Ok the front looks good, make sure we can get at the rest.  */
 981        if (!pskb_may_pull(skb, skb->len))
 982                goto drop;
 983
 984        b = (struct bootp_pkt *)skb_network_header(skb);
 985        h = &b->iph;
 986
 987        /* One reply at a time, please. */
 988        spin_lock(&ic_recv_lock);
 989
 990        /* If we already have a reply, just drop the packet */
 991        if (ic_got_reply)
 992                goto drop_unlock;
 993
 994        /* Find the ic_device that the packet arrived on */
 995        d = ic_first_dev;
 996        while (d && d->dev != dev)
 997                d = d->next;
 998        if (!d)
 999                goto drop_unlock;  /* should never happen */
1000
1001        /* Is it a reply to our BOOTP request? */
1002        if (b->op != BOOTP_REPLY ||
1003            b->xid != d->xid) {
1004                net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1005                                    b->op, b->xid);
1006                goto drop_unlock;
1007        }
1008
1009        /* Is it a reply for the device we are configuring? */
1010        if (b->xid != ic_dev_xid) {
1011                net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1012                goto drop_unlock;
1013        }
1014
1015        /* Parse extensions */
1016        if (ext_len >= 4 &&
1017            !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1018                u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1019                u8 *ext;
1020
1021#ifdef IPCONFIG_DHCP
1022                if (ic_proto_enabled & IC_USE_DHCP) {
1023                        __be32 server_id = NONE;
1024                        int mt = 0;
1025
1026                        ext = &b->exten[4];
1027                        while (ext < end && *ext != 0xff) {
1028                                u8 *opt = ext++;
1029                                if (*opt == 0)  /* Padding */
1030                                        continue;
1031                                ext += *ext + 1;
1032                                if (ext >= end)
1033                                        break;
1034                                switch (*opt) {
1035                                case 53:        /* Message type */
1036                                        if (opt[1])
1037                                                mt = opt[2];
1038                                        break;
1039                                case 54:        /* Server ID (IP address) */
1040                                        if (opt[1] >= 4)
1041                                                memcpy(&server_id, opt + 2, 4);
1042                                        break;
1043                                }
1044                        }
1045
1046#ifdef IPCONFIG_DEBUG
1047                        printk("DHCP: Got message type %d\n", mt);
1048#endif
1049
1050                        switch (mt) {
1051                        case DHCPOFFER:
1052                                /* While in the process of accepting one offer,
1053                                 * ignore all others.
1054                                 */
1055                                if (ic_myaddr != NONE)
1056                                        goto drop_unlock;
1057
1058                                /* Let's accept that offer. */
1059                                ic_myaddr = b->your_ip;
1060                                ic_servaddr = server_id;
1061#ifdef IPCONFIG_DEBUG
1062                                printk("DHCP: Offered address %pI4 by server %pI4\n",
1063                                       &ic_myaddr, &ic_servaddr);
1064#endif
1065                                /* The DHCP indicated server address takes
1066                                 * precedence over the bootp header one if
1067                                 * they are different.
1068                                 */
1069                                if ((server_id != NONE) &&
1070                                    (b->server_ip != server_id))
1071                                        b->server_ip = ic_servaddr;
1072                                break;
1073
1074                        case DHCPACK:
1075                                if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1076                                        goto drop_unlock;
1077
1078                                /* Yeah! */
1079                                break;
1080
1081                        default:
1082                                /* Urque.  Forget it*/
1083                                ic_myaddr = NONE;
1084                                ic_servaddr = NONE;
1085                                goto drop_unlock;
1086                        }
1087
1088                        ic_dhcp_msgtype = mt;
1089
1090                }
1091#endif /* IPCONFIG_DHCP */
1092
1093                ext = &b->exten[4];
1094                while (ext < end && *ext != 0xff) {
1095                        u8 *opt = ext++;
1096                        if (*opt == 0)  /* Padding */
1097                                continue;
1098                        ext += *ext + 1;
1099                        if (ext < end)
1100                                ic_do_bootp_ext(opt);
1101                }
1102        }
1103
1104        /* We have a winner! */
1105        ic_dev = dev;
1106        ic_myaddr = b->your_ip;
1107        ic_servaddr = b->server_ip;
1108        if (ic_gateway == NONE && b->relay_ip)
1109                ic_gateway = b->relay_ip;
1110        if (ic_nameservers[0] == NONE)
1111                ic_nameservers[0] = ic_servaddr;
1112        ic_got_reply = IC_BOOTP;
1113
1114drop_unlock:
1115        /* Show's over.  Nothing to see here.  */
1116        spin_unlock(&ic_recv_lock);
1117
1118drop:
1119        /* Throw the packet out. */
1120        kfree_skb(skb);
1121
1122        return 0;
1123}
1124
1125
1126#endif
1127
1128
1129/*
1130 *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1131 */
1132
1133#ifdef IPCONFIG_DYNAMIC
1134
1135static int __init ic_dynamic(void)
1136{
1137        int retries;
1138        struct ic_device *d;
1139        unsigned long start_jiffies, timeout, jiff;
1140        int do_bootp = ic_proto_have_if & IC_BOOTP;
1141        int do_rarp = ic_proto_have_if & IC_RARP;
1142
1143        /*
1144         * If none of DHCP/BOOTP/RARP was selected, return with an error.
1145         * This routine gets only called when some pieces of information
1146         * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1147         */
1148        if (!ic_proto_enabled) {
1149                pr_err("IP-Config: Incomplete network configuration information\n");
1150                return -1;
1151        }
1152
1153#ifdef IPCONFIG_BOOTP
1154        if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1155                pr_err("DHCP/BOOTP: No suitable device found\n");
1156#endif
1157#ifdef IPCONFIG_RARP
1158        if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1159                pr_err("RARP: No suitable device found\n");
1160#endif
1161
1162        if (!ic_proto_have_if)
1163                /* Error message already printed */
1164                return -1;
1165
1166        /*
1167         * Setup protocols
1168         */
1169#ifdef IPCONFIG_BOOTP
1170        if (do_bootp)
1171                ic_bootp_init();
1172#endif
1173#ifdef IPCONFIG_RARP
1174        if (do_rarp)
1175                ic_rarp_init();
1176#endif
1177
1178        /*
1179         * Send requests and wait, until we get an answer. This loop
1180         * seems to be a terrible waste of CPU time, but actually there is
1181         * only one process running at all, so we don't need to use any
1182         * scheduler functions.
1183         * [Actually we could now, but the nothing else running note still
1184         *  applies.. - AC]
1185         */
1186        pr_notice("Sending %s%s%s requests .",
1187                  do_bootp
1188                  ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1189                  (do_bootp && do_rarp) ? " and " : "",
1190                  do_rarp ? "RARP" : "");
1191
1192        start_jiffies = jiffies;
1193        d = ic_first_dev;
1194        retries = CONF_SEND_RETRIES;
1195        get_random_bytes(&timeout, sizeof(timeout));
1196        timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1197        for (;;) {
1198                /* Track the device we are configuring */
1199                ic_dev_xid = d->xid;
1200
1201#ifdef IPCONFIG_BOOTP
1202                if (do_bootp && (d->able & IC_BOOTP))
1203                        ic_bootp_send_if(d, jiffies - start_jiffies);
1204#endif
1205#ifdef IPCONFIG_RARP
1206                if (do_rarp && (d->able & IC_RARP))
1207                        ic_rarp_send_if(d);
1208#endif
1209
1210                jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1211                while (time_before(jiffies, jiff) && !ic_got_reply)
1212                        schedule_timeout_uninterruptible(1);
1213#ifdef IPCONFIG_DHCP
1214                /* DHCP isn't done until we get a DHCPACK. */
1215                if ((ic_got_reply & IC_BOOTP) &&
1216                    (ic_proto_enabled & IC_USE_DHCP) &&
1217                    ic_dhcp_msgtype != DHCPACK) {
1218                        ic_got_reply = 0;
1219                        pr_cont(",");
1220                        continue;
1221                }
1222#endif /* IPCONFIG_DHCP */
1223
1224                if (ic_got_reply) {
1225                        pr_cont(" OK\n");
1226                        break;
1227                }
1228
1229                if ((d = d->next))
1230                        continue;
1231
1232                if (! --retries) {
1233                        pr_cont(" timed out!\n");
1234                        break;
1235                }
1236
1237                d = ic_first_dev;
1238
1239                timeout = timeout CONF_TIMEOUT_MULT;
1240                if (timeout > CONF_TIMEOUT_MAX)
1241                        timeout = CONF_TIMEOUT_MAX;
1242
1243                pr_cont(".");
1244        }
1245
1246#ifdef IPCONFIG_BOOTP
1247        if (do_bootp)
1248                ic_bootp_cleanup();
1249#endif
1250#ifdef IPCONFIG_RARP
1251        if (do_rarp)
1252                ic_rarp_cleanup();
1253#endif
1254
1255        if (!ic_got_reply) {
1256                ic_myaddr = NONE;
1257                return -1;
1258        }
1259
1260        printk("IP-Config: Got %s answer from %pI4, ",
1261                ((ic_got_reply & IC_RARP) ? "RARP"
1262                 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1263               &ic_servaddr);
1264        pr_cont("my address is %pI4\n", &ic_myaddr);
1265
1266        return 0;
1267}
1268
1269#endif /* IPCONFIG_DYNAMIC */
1270
1271#ifdef CONFIG_PROC_FS
1272
1273static int pnp_seq_show(struct seq_file *seq, void *v)
1274{
1275        int i;
1276
1277        if (ic_proto_used & IC_PROTO)
1278                seq_printf(seq, "#PROTO: %s\n",
1279                           (ic_proto_used & IC_RARP) ? "RARP"
1280                           : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1281        else
1282                seq_puts(seq, "#MANUAL\n");
1283
1284        if (ic_domain[0])
1285                seq_printf(seq,
1286                           "domain %s\n", ic_domain);
1287        for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1288                if (ic_nameservers[i] != NONE)
1289                        seq_printf(seq, "nameserver %pI4\n",
1290                                   &ic_nameservers[i]);
1291        }
1292        if (ic_servaddr != NONE)
1293                seq_printf(seq, "bootserver %pI4\n",
1294                           &ic_servaddr);
1295        return 0;
1296}
1297
1298static int pnp_seq_open(struct inode *indoe, struct file *file)
1299{
1300        return single_open(file, pnp_seq_show, NULL);
1301}
1302
1303static const struct file_operations pnp_seq_fops = {
1304        .owner          = THIS_MODULE,
1305        .open           = pnp_seq_open,
1306        .read           = seq_read,
1307        .llseek         = seq_lseek,
1308        .release        = single_release,
1309};
1310#endif /* CONFIG_PROC_FS */
1311
1312/*
1313 *  Extract IP address from the parameter string if needed. Note that we
1314 *  need to have root_server_addr set _before_ IPConfig gets called as it
1315 *  can override it.
1316 */
1317__be32 __init root_nfs_parse_addr(char *name)
1318{
1319        __be32 addr;
1320        int octets = 0;
1321        char *cp, *cq;
1322
1323        cp = cq = name;
1324        while (octets < 4) {
1325                while (*cp >= '0' && *cp <= '9')
1326                        cp++;
1327                if (cp == cq || cp - cq > 3)
1328                        break;
1329                if (*cp == '.' || octets == 3)
1330                        octets++;
1331                if (octets < 4)
1332                        cp++;
1333                cq = cp;
1334        }
1335        if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1336                if (*cp == ':')
1337                        *cp++ = '\0';
1338                addr = in_aton(name);
1339                memmove(name, cp, strlen(cp) + 1);
1340        } else
1341                addr = NONE;
1342
1343        return addr;
1344}
1345
1346#define DEVICE_WAIT_MAX         12 /* 12 seconds */
1347
1348static int __init wait_for_devices(void)
1349{
1350        int i;
1351
1352        for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1353                struct net_device *dev;
1354                int found = 0;
1355
1356                rtnl_lock();
1357                for_each_netdev(&init_net, dev) {
1358                        if (ic_is_init_dev(dev)) {
1359                                found = 1;
1360                                break;
1361                        }
1362                }
1363                rtnl_unlock();
1364                if (found)
1365                        return 0;
1366                ssleep(1);
1367        }
1368        return -ENODEV;
1369}
1370
1371/*
1372 *      IP Autoconfig dispatcher.
1373 */
1374
1375static int __init ip_auto_config(void)
1376{
1377        __be32 addr;
1378#ifdef IPCONFIG_DYNAMIC
1379        int retries = CONF_OPEN_RETRIES;
1380#endif
1381        int err;
1382
1383#ifdef CONFIG_PROC_FS
1384        proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops);
1385#endif /* CONFIG_PROC_FS */
1386
1387        if (!ic_enable)
1388                return 0;
1389
1390        DBG(("IP-Config: Entered.\n"));
1391#ifdef IPCONFIG_DYNAMIC
1392 try_try_again:
1393#endif
1394        /* Wait for devices to appear */
1395        err = wait_for_devices();
1396        if (err)
1397                return err;
1398
1399        /* Setup all network devices */
1400        err = ic_open_devs();
1401        if (err)
1402                return err;
1403
1404        /* Give drivers a chance to settle */
1405        msleep(CONF_POST_OPEN);
1406
1407        /*
1408         * If the config information is insufficient (e.g., our IP address or
1409         * IP address of the boot server is missing or we have multiple network
1410         * interfaces and no default was set), use BOOTP or RARP to get the
1411         * missing values.
1412         */
1413        if (ic_myaddr == NONE ||
1414#ifdef CONFIG_ROOT_NFS
1415            (root_server_addr == NONE &&
1416             ic_servaddr == NONE &&
1417             ROOT_DEV == Root_NFS) ||
1418#endif
1419            ic_first_dev->next) {
1420#ifdef IPCONFIG_DYNAMIC
1421                if (ic_dynamic() < 0) {
1422                        ic_close_devs();
1423
1424                        /*
1425                         * I don't know why, but sometimes the
1426                         * eepro100 driver (at least) gets upset and
1427                         * doesn't work the first time it's opened.
1428                         * But then if you close it and reopen it, it
1429                         * works just fine.  So we need to try that at
1430                         * least once before giving up.
1431                         *
1432                         * Also, if the root will be NFS-mounted, we
1433                         * have nowhere to go if DHCP fails.  So we
1434                         * just have to keep trying forever.
1435                         *
1436                         *                              -- Chip
1437                         */
1438#ifdef CONFIG_ROOT_NFS
1439                        if (ROOT_DEV ==  Root_NFS) {
1440                                pr_err("IP-Config: Retrying forever (NFS root)...\n");
1441                                goto try_try_again;
1442                        }
1443#endif
1444
1445                        if (--retries) {
1446                                pr_err("IP-Config: Reopening network devices...\n");
1447                                goto try_try_again;
1448                        }
1449
1450                        /* Oh, well.  At least we tried. */
1451                        pr_err("IP-Config: Auto-configuration of network failed\n");
1452                        return -1;
1453                }
1454#else /* !DYNAMIC */
1455                pr_err("IP-Config: Incomplete network configuration information\n");
1456                ic_close_devs();
1457                return -1;
1458#endif /* IPCONFIG_DYNAMIC */
1459        } else {
1460                /* Device selected manually or only one device -> use it */
1461                ic_dev = ic_first_dev->dev;
1462        }
1463
1464        addr = root_nfs_parse_addr(root_server_path);
1465        if (root_server_addr == NONE)
1466                root_server_addr = addr;
1467
1468        /*
1469         * Use defaults wherever applicable.
1470         */
1471        if (ic_defaults() < 0)
1472                return -1;
1473
1474        /*
1475         * Close all network devices except the device we've
1476         * autoconfigured and set up routes.
1477         */
1478        ic_close_devs();
1479        if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1480                return -1;
1481
1482        /*
1483         * Record which protocol was actually used.
1484         */
1485#ifdef IPCONFIG_DYNAMIC
1486        ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1487#endif
1488
1489#ifndef IPCONFIG_SILENT
1490        /*
1491         * Clue in the operator.
1492         */
1493        pr_info("IP-Config: Complete:\n");
1494        pr_info("     device=%s, addr=%pI4, mask=%pI4, gw=%pI4\n",
1495                ic_dev->name, &ic_myaddr, &ic_netmask, &ic_gateway);
1496        pr_info("     host=%s, domain=%s, nis-domain=%s\n",
1497                utsname()->nodename, ic_domain, utsname()->domainname);
1498        pr_info("     bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1499                &ic_servaddr, &root_server_addr, root_server_path);
1500        if (ic_dev_mtu)
1501                pr_cont(", mtu=%d", ic_dev_mtu);
1502        pr_cont("\n");
1503#endif /* !SILENT */
1504
1505        return 0;
1506}
1507
1508late_initcall(ip_auto_config);
1509
1510
1511/*
1512 *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1513 *  command line parameter.  See Documentation/filesystems/nfs/nfsroot.txt.
1514 */
1515static int __init ic_proto_name(char *name)
1516{
1517        if (!strcmp(name, "on") || !strcmp(name, "any")) {
1518                return 1;
1519        }
1520        if (!strcmp(name, "off") || !strcmp(name, "none")) {
1521                return 0;
1522        }
1523#ifdef CONFIG_IP_PNP_DHCP
1524        else if (!strcmp(name, "dhcp")) {
1525                ic_proto_enabled &= ~IC_RARP;
1526                return 1;
1527        }
1528#endif
1529#ifdef CONFIG_IP_PNP_BOOTP
1530        else if (!strcmp(name, "bootp")) {
1531                ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1532                return 1;
1533        }
1534#endif
1535#ifdef CONFIG_IP_PNP_RARP
1536        else if (!strcmp(name, "rarp")) {
1537                ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1538                return 1;
1539        }
1540#endif
1541#ifdef IPCONFIG_DYNAMIC
1542        else if (!strcmp(name, "both")) {
1543                ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1544                return 1;
1545        }
1546#endif
1547        return 0;
1548}
1549
1550static int __init ip_auto_config_setup(char *addrs)
1551{
1552        char *cp, *ip, *dp;
1553        int num = 0;
1554
1555        ic_set_manually = 1;
1556        ic_enable = 1;
1557
1558        /*
1559         * If any dhcp, bootp etc options are set, leave autoconfig on
1560         * and skip the below static IP processing.
1561         */
1562        if (ic_proto_name(addrs))
1563                return 1;
1564
1565        /* If no static IP is given, turn off autoconfig and bail.  */
1566        if (*addrs == 0 ||
1567            strcmp(addrs, "off") == 0 ||
1568            strcmp(addrs, "none") == 0) {
1569                ic_enable = 0;
1570                return 1;
1571        }
1572
1573        /* Parse string for static IP assignment.  */
1574        ip = addrs;
1575        while (ip && *ip) {
1576                if ((cp = strchr(ip, ':')))
1577                        *cp++ = '\0';
1578                if (strlen(ip) > 0) {
1579                        DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1580                        switch (num) {
1581                        case 0:
1582                                if ((ic_myaddr = in_aton(ip)) == ANY)
1583                                        ic_myaddr = NONE;
1584                                break;
1585                        case 1:
1586                                if ((ic_servaddr = in_aton(ip)) == ANY)
1587                                        ic_servaddr = NONE;
1588                                break;
1589                        case 2:
1590                                if ((ic_gateway = in_aton(ip)) == ANY)
1591                                        ic_gateway = NONE;
1592                                break;
1593                        case 3:
1594                                if ((ic_netmask = in_aton(ip)) == ANY)
1595                                        ic_netmask = NONE;
1596                                break;
1597                        case 4:
1598                                if ((dp = strchr(ip, '.'))) {
1599                                        *dp++ = '\0';
1600                                        strlcpy(utsname()->domainname, dp,
1601                                                sizeof(utsname()->domainname));
1602                                }
1603                                strlcpy(utsname()->nodename, ip,
1604                                        sizeof(utsname()->nodename));
1605                                ic_host_name_set = 1;
1606                                break;
1607                        case 5:
1608                                strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1609                                break;
1610                        case 6:
1611                                if (ic_proto_name(ip) == 0 &&
1612                                    ic_myaddr == NONE) {
1613                                        ic_enable = 0;
1614                                }
1615                                break;
1616                        }
1617                }
1618                ip = cp;
1619                num++;
1620        }
1621
1622        return 1;
1623}
1624__setup("ip=", ip_auto_config_setup);
1625
1626static int __init nfsaddrs_config_setup(char *addrs)
1627{
1628        return ip_auto_config_setup(addrs);
1629}
1630__setup("nfsaddrs=", nfsaddrs_config_setup);
1631
1632static int __init vendor_class_identifier_setup(char *addrs)
1633{
1634        if (strlcpy(vendor_class_identifier, addrs,
1635                    sizeof(vendor_class_identifier))
1636            >= sizeof(vendor_class_identifier))
1637                pr_warn("DHCP: vendorclass too long, truncated to \"%s\"",
1638                        vendor_class_identifier);
1639        return 1;
1640}
1641__setup("dhcpclass=", vendor_class_identifier_setup);
1642
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