kernel/net/ipv4/ipconfig.c

   1 /*
   2  *  Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
   3  *  user-supplied information to configure own IP address and routes.
   4  *
   5  *  Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
   6  *
   7  *  Derived from network configuration code in fs/nfs/nfsroot.c,
   8  *  originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
   9  *
  10  *  BOOTP rewritten to construct and analyse packets itself instead
  11  *  of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
  12  *                                           -- MJ, December 1998
  13  *
  14  *  Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
  15  *  initialization scheme.
  16  *      - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
  17  *
  18  *  DHCP support added.  To users this looks like a whole separate
  19  *  protocol, but we know it's just a bag on the side of BOOTP.
  20  *              -- Chip Salzenberg <chip@valinux.com>, May 2000
  21  *
  22  *  Ported DHCP support from 2.2.16 to 2.4.0-test4
  23  *              -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
  24  *
  25  *  Merged changes from 2.2.19 into 2.4.3
  26  *              -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
  27  *
  28  *  Multiple Nameservers in /proc/net/pnp
  29  *              --  Josef Siemes <jsiemes@web.de>, Aug 2002
  30  */
  31
  32 #include <linux/types.h>
  33 #include <linux/string.h>
  34 #include <linux/kernel.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/random.h>
  37 #include <linux/init.h>
  38 #include <linux/utsname.h>
  39 #include <linux/in.h>
  40 #include <linux/if.h>
  41 #include <linux/inet.h>
  42 #include <linux/inetdevice.h>
  43 #include <linux/netdevice.h>
  44 #include <linux/if_arp.h>
  45 #include <linux/skbuff.h>
  46 #include <linux/ip.h>
  47 #include <linux/socket.h>
  48 #include <linux/route.h>
  49 #include <linux/udp.h>
  50 #include <linux/proc_fs.h>
  51 #include <linux/seq_file.h>
  52 #include <linux/major.h>
  53 #include <linux/root_dev.h>
  54 #include <linux/delay.h>
  55 #include <linux/nfs_fs.h>
  56 #include <linux/slab.h>
  57 #include <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  */
 116 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
 117
 118 static int ic_enable __initdata;                /* IP config enabled? */
 119
 120 /* Protocol choice */
 121 int 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
 133 static int ic_host_name_set __initdata; /* Host name set by us? */
 134
 135 __be32 ic_myaddr = NONE;                /* My IP address */
 136 static __be32 ic_netmask = NONE;        /* Netmask for local subnet */
 137 __be32 ic_gateway = NONE;       /* Gateway IP address */
 138
 139 __be32 ic_addrservaddr = NONE;  /* IP Address of the IP addresses'server */
 140
 141 __be32 ic_servaddr = NONE;      /* Boot server IP address */
 142
 143 __be32 root_server_addr = NONE; /* Address of NFS server */
 144 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
 145
 146 /* vendor class identifier */
 147 static char vendor_class_identifier[253] __initdata;
 148
 149 /* Persistent data: */
 150
 151 static int ic_proto_used;                       /* Protocol used, if any */
 152 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
 153 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
 154
 155 /*
 156  * Private state.
 157  */
 158
 159 /* Name of user-selected boot device */
 160 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
 161
 162 /* Protocols supported by available interfaces */
 163 static int ic_proto_have_if __initdata;
 164
 165 /* MTU for boot device */
 166 static int ic_dev_mtu __initdata;
 167
 168 #ifdef IPCONFIG_DYNAMIC
 169 static DEFINE_SPINLOCK(ic_recv_lock);
 170 static volatile int ic_got_reply __initdata;    /* Proto(s) that replied */
 171 #endif
 172 #ifdef IPCONFIG_DHCP
 173 static int ic_dhcp_msgtype __initdata;  /* DHCP msg type received */
 174 #endif
 175
 176
 177 /*
 178  *      Network devices
 179  */
 180
 181 struct ic_device {
 182         struct ic_device *next;
 183         struct net_device *dev;
 184         unsigned short flags;
 185         short able;
 186         __be32 xid;
 187 };
 188
 189 static struct ic_device *ic_first_dev __initdata;       /* List of open device */
 190 static struct net_device *ic_dev __initdata;            /* Selected device */
 191
 192 static 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
 202 static 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, next_msg;
 208
 209         last = &ic_first_dev;
 210         rtnl_lock();
 211
 212         /* bring loopback and DSA master network devices up first */
 213         for_each_netdev(&init_net, dev) {
 214                 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))
 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         next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
 265         while (time_before(jiffies, start +
 266                            msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) {
 267                 int wait, elapsed;
 268
 269                 for_each_netdev(&init_net, dev)
 270                         if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
 271                                 goto have_carrier;
 272
 273                 msleep(1);
 274
 275                 if (time_before(jiffies, next_msg))
 276                         continue;
 277
 278                 elapsed = jiffies_to_msecs(jiffies - start);
 279                 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
 280                 pr_info("Waiting up to %d more seconds for network.\n", wait);
 281                 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
 282         }
 283 have_carrier:
 284         rtnl_unlock();
 285
 286         *last = NULL;
 287
 288         if (!ic_first_dev) {
 289                 if (user_dev_name[0])
 290                         pr_err("IP-Config: Device `%s' not found\n",
 291                                user_dev_name);
 292                 else
 293                         pr_err("IP-Config: No network devices available\n");
 294                 return -ENODEV;
 295         }
 296         return 0;
 297 }
 298
 299 static void __init ic_close_devs(void)
 300 {
 301         struct ic_device *d, *next;
 302         struct net_device *dev;
 303
 304         rtnl_lock();
 305         next = ic_first_dev;
 306         while ((d = next)) {
 307                 next = d->next;
 308                 dev = d->dev;
 309                 if (dev != ic_dev && !netdev_uses_dsa(dev)) {
 310                         DBG(("IP-Config: Downing %s\n", dev->name));
 311                         dev_change_flags(dev, d->flags);
 312                 }
 313                 kfree(d);
 314         }
 315         rtnl_unlock();
 316 }
 317
 318 /*
 319  *      Interface to various network functions.
 320  */
 321
 322 static inline void
 323 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
 324 {
 325         sin->sin_family = AF_INET;
 326         sin->sin_addr.s_addr = addr;
 327         sin->sin_port = port;
 328 }
 329
 330 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
 331 {
 332         int res;
 333
 334         mm_segment_t oldfs = get_fs();
 335         set_fs(get_ds());
 336         res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
 337         set_fs(oldfs);
 338         return res;
 339 }
 340
 341 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
 342 {
 343         int res;
 344
 345         mm_segment_t oldfs = get_fs();
 346         set_fs(get_ds());
 347         res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
 348         set_fs(oldfs);
 349         return res;
 350 }
 351
 352 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
 353 {
 354         int res;
 355
 356         mm_segment_t oldfs = get_fs();
 357         set_fs(get_ds());
 358         res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
 359         set_fs(oldfs);
 360         return res;
 361 }
 362
 363 /*
 364  *      Set up interface addresses and routes.
 365  */
 366
 367 static int __init ic_setup_if(void)
 368 {
 369         struct ifreq ir;
 370         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
 371         int err;
 372
 373         memset(&ir, 0, sizeof(ir));
 374         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
 375         set_sockaddr(sin, ic_myaddr, 0);
 376         if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
 377                 pr_err("IP-Config: Unable to set interface address (%d)\n",
 378                        err);
 379                 return -1;
 380         }
 381         set_sockaddr(sin, ic_netmask, 0);
 382         if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
 383                 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
 384                        err);
 385                 return -1;
 386         }
 387         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
 388         if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
 389                 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
 390                        err);
 391                 return -1;
 392         }
 393         /* Handle the case where we need non-standard MTU on the boot link (a network
 394          * using jumbo frames, for instance).  If we can't set the mtu, don't error
 395          * out, we'll try to muddle along.
 396          */
 397         if (ic_dev_mtu != 0) {
 398                 strcpy(ir.ifr_name, ic_dev->name);
 399                 ir.ifr_mtu = ic_dev_mtu;
 400                 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
 401                         pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
 402                                ic_dev_mtu, err);
 403         }
 404         return 0;
 405 }
 406
 407 static int __init ic_setup_routes(void)
 408 {
 409         /* No need to setup device routes, only the default route... */
 410
 411         if (ic_gateway != NONE) {
 412                 struct rtentry rm;
 413                 int err;
 414
 415                 memset(&rm, 0, sizeof(rm));
 416                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
 417                         pr_err("IP-Config: Gateway not on directly connected network\n");
 418                         return -1;
 419                 }
 420                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
 421                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
 422                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
 423                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
 424                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
 425                         pr_err("IP-Config: Cannot add default route (%d)\n",
 426                                err);
 427                         return -1;
 428                 }
 429         }
 430
 431         return 0;
 432 }
 433
 434 /*
 435  *      Fill in default values for all missing parameters.
 436  */
 437
 438 static int __init ic_defaults(void)
 439 {
 440         /*
 441          *      At this point we have no userspace running so need not
 442          *      claim locks on system_utsname
 443          */
 444
 445         if (!ic_host_name_set)
 446                 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
 447
 448         if (root_server_addr == NONE)
 449                 root_server_addr = ic_servaddr;
 450
 451         if (ic_netmask == NONE) {
 452                 if (IN_CLASSA(ntohl(ic_myaddr)))
 453                         ic_netmask = htonl(IN_CLASSA_NET);
 454                 else if (IN_CLASSB(ntohl(ic_myaddr)))
 455                         ic_netmask = htonl(IN_CLASSB_NET);
 456                 else if (IN_CLASSC(ntohl(ic_myaddr)))
 457                         ic_netmask = htonl(IN_CLASSC_NET);
 458                 else {
 459                         pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
 460                                &ic_myaddr);
 461                         return -1;
 462                 }
 463                 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
 464         }
 465
 466         return 0;
 467 }
 468
 469 /*
 470  *      RARP support.
 471  */
 472
 473 #ifdef IPCONFIG_RARP
 474
 475 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 476
 477 static struct packet_type rarp_packet_type __initdata = {
 478         .type = cpu_to_be16(ETH_P_RARP),
 479         .func = ic_rarp_recv,
 480 };
 481
 482 static inline void __init ic_rarp_init(void)
 483 {
 484         dev_add_pack(&rarp_packet_type);
 485 }
 486
 487 static inline void __init ic_rarp_cleanup(void)
 488 {
 489         dev_remove_pack(&rarp_packet_type);
 490 }
 491
 492 /*
 493  *  Process received RARP packet.
 494  */
 495 static int __init
 496 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 497 {
 498         struct arphdr *rarp;
 499         unsigned char *rarp_ptr;
 500         __be32 sip, tip;
 501         unsigned char *tha;             /* t for "target" */
 502         struct ic_device *d;
 503
 504         if (!net_eq(dev_net(dev), &init_net))
 505                 goto drop;
 506
 507         skb = skb_share_check(skb, GFP_ATOMIC);
 508         if (!skb)
 509                 return NET_RX_DROP;
 510
 511         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
 512                 goto drop;
 513
 514         /* Basic sanity checks can be done without the lock.  */
 515         rarp = (struct arphdr *)skb_transport_header(skb);
 516
 517         /* If this test doesn't pass, it's not IP, or we should
 518          * ignore it anyway.
 519          */
 520         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
 521                 goto drop;
 522
 523         /* If it's not a RARP reply, delete it. */
 524         if (rarp->ar_op != htons(ARPOP_RREPLY))
 525                 goto drop;
 526
 527         /* If it's not Ethernet, delete it. */
 528         if (rarp->ar_pro != htons(ETH_P_IP))
 529                 goto drop;
 530
 531         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
 532                 goto drop;
 533
 534         /* OK, it is all there and looks valid, process... */
 535         rarp = (struct arphdr *)skb_transport_header(skb);
 536         rarp_ptr = (unsigned char *) (rarp + 1);
 537
 538         /* One reply at a time, please. */
 539         spin_lock(&ic_recv_lock);
 540
 541         /* If we already have a reply, just drop the packet */
 542         if (ic_got_reply)
 543                 goto drop_unlock;
 544
 545         /* Find the ic_device that the packet arrived on */
 546         d = ic_first_dev;
 547         while (d && d->dev != dev)
 548                 d = d->next;
 549         if (!d)
 550                 goto drop_unlock;       /* should never happen */
 551
 552         /* Extract variable-width fields */
 553         rarp_ptr += dev->addr_len;
 554         memcpy(&sip, rarp_ptr, 4);
 555         rarp_ptr += 4;
 556         tha = rarp_ptr;
 557         rarp_ptr += dev->addr_len;
 558         memcpy(&tip, rarp_ptr, 4);
 559
 560         /* Discard packets which are not meant for us. */
 561         if (memcmp(tha, dev->dev_addr, dev->addr_len))
 562                 goto drop_unlock;
 563
 564         /* Discard packets which are not from specified server. */
 565         if (ic_servaddr != NONE && ic_servaddr != sip)
 566                 goto drop_unlock;
 567
 568         /* We have a winner! */
 569         ic_dev = dev;
 570         if (ic_myaddr == NONE)
 571                 ic_myaddr = tip;
 572         ic_servaddr = sip;
 573         ic_addrservaddr = sip;
 574         ic_got_reply = IC_RARP;
 575
 576 drop_unlock:
 577         /* Show's over.  Nothing to see here.  */
 578         spin_unlock(&ic_recv_lock);
 579
 580 drop:
 581         /* Throw the packet out. */
 582         kfree_skb(skb);
 583         return 0;
 584 }
 585
 586
 587 /*
 588  *  Send RARP request packet over a single interface.
 589  */
 590 static void __init ic_rarp_send_if(struct ic_device *d)
 591 {
 592         struct net_device *dev = d->dev;
 593         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
 594                  dev->dev_addr, dev->dev_addr);
 595 }
 596 #endif
 597
 598 /*
 599  *  Predefine Nameservers
 600  */
 601 static inline void __init ic_nameservers_predef(void)
 602 {
 603         int i;
 604
 605         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
 606                 ic_nameservers[i] = NONE;
 607 }
 608
 609 /*
 610  *      DHCP/BOOTP support.
 611  */
 612
 613 #ifdef IPCONFIG_BOOTP
 614
 615 struct bootp_pkt {              /* BOOTP packet format */
 616         struct iphdr iph;       /* IP header */
 617         struct udphdr udph;     /* UDP header */
 618         u8 op;                  /* 1=request, 2=reply */
 619         u8 htype;               /* HW address type */
 620         u8 hlen;                /* HW address length */
 621         u8 hops;                /* Used only by gateways */
 622         __be32 xid;             /* Transaction ID */
 623         __be16 secs;            /* Seconds since we started */
 624         __be16 flags;           /* Just what it says */
 625         __be32 client_ip;               /* Client's IP address if known */
 626         __be32 your_ip;         /* Assigned IP address */
 627         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
 628         __be32 relay_ip;                /* IP address of BOOTP relay */
 629         u8 hw_addr[16];         /* Client's HW address */
 630         u8 serv_name[64];       /* Server host name */
 631         u8 boot_file[128];      /* Name of boot file */
 632         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
 633 };
 634
 635 /* packet ops */
 636 #define BOOTP_REQUEST   1
 637 #define BOOTP_REPLY     2
 638
 639 /* DHCP message types */
 640 #define DHCPDISCOVER    1
 641 #define DHCPOFFER       2
 642 #define DHCPREQUEST     3
 643 #define DHCPDECLINE     4
 644 #define DHCPACK         5
 645 #define DHCPNAK         6
 646 #define DHCPRELEASE     7
 647 #define DHCPINFORM      8
 648
 649 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 650
 651 static struct packet_type bootp_packet_type __initdata = {
 652         .type = cpu_to_be16(ETH_P_IP),
 653         .func = ic_bootp_recv,
 654 };
 655
 656 static __be32 ic_dev_xid;               /* Device under configuration */
 657
 658 /*
 659  *  Initialize DHCP/BOOTP extension fields in the request.
 660  */
 661
 662 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
 663
 664 #ifdef IPCONFIG_DHCP
 665
 666 static void __init
 667 ic_dhcp_init_options(u8 *options)
 668 {
 669         u8 mt = ((ic_servaddr == NONE)
 670                  ? DHCPDISCOVER : DHCPREQUEST);
 671         u8 *e = options;
 672         int len;
 673
 674 #ifdef IPCONFIG_DEBUG
 675         printk("DHCP: Sending message type %d\n", mt);
 676 #endif
 677
 678         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 679         e += 4;
 680
 681         *e++ = 53;              /* DHCP message type */
 682         *e++ = 1;
 683         *e++ = mt;
 684
 685         if (mt == DHCPREQUEST) {
 686                 *e++ = 54;      /* Server ID (IP address) */
 687                 *e++ = 4;
 688                 memcpy(e, &ic_servaddr, 4);
 689                 e += 4;
 690
 691                 *e++ = 50;      /* Requested IP address */
 692                 *e++ = 4;
 693                 memcpy(e, &ic_myaddr, 4);
 694                 e += 4;
 695         }
 696
 697         /* always? */
 698         {
 699                 static const u8 ic_req_params[] = {
 700                         1,      /* Subnet mask */
 701                         3,      /* Default gateway */
 702                         6,      /* DNS server */
 703                         12,     /* Host name */
 704                         15,     /* Domain name */
 705                         17,     /* Boot path */
 706                         26,     /* MTU */
 707                         40,     /* NIS domain name */
 708                 };
 709
 710                 *e++ = 55;      /* Parameter request list */
 711                 *e++ = sizeof(ic_req_params);
 712                 memcpy(e, ic_req_params, sizeof(ic_req_params));
 713                 e += sizeof(ic_req_params);
 714
 715                 if (ic_host_name_set) {
 716                         *e++ = 12;      /* host-name */
 717                         len = strlen(utsname()->nodename);
 718                         *e++ = len;
 719                         memcpy(e, utsname()->nodename, len);
 720                         e += len;
 721                 }
 722                 if (*vendor_class_identifier) {
 723                         pr_info("DHCP: sending class identifier \"%s\"\n",
 724                                 vendor_class_identifier);
 725                         *e++ = 60;      /* Class-identifier */
 726                         len = strlen(vendor_class_identifier);
 727                         *e++ = len;
 728                         memcpy(e, vendor_class_identifier, len);
 729                         e += len;
 730                 }
 731         }
 732
 733         *e++ = 255;     /* End of the list */
 734 }
 735
 736 #endif /* IPCONFIG_DHCP */
 737
 738 static void __init ic_bootp_init_ext(u8 *e)
 739 {
 740         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 741         e += 4;
 742         *e++ = 1;               /* Subnet mask request */
 743         *e++ = 4;
 744         e += 4;
 745         *e++ = 3;               /* Default gateway request */
 746         *e++ = 4;
 747         e += 4;
 748         *e++ = 5;               /* Name server request */
 749         *e++ = 8;
 750         e += 8;
 751         *e++ = 12;              /* Host name request */
 752         *e++ = 32;
 753         e += 32;
 754         *e++ = 40;              /* NIS Domain name request */
 755         *e++ = 32;
 756         e += 32;
 757         *e++ = 17;              /* Boot path */
 758         *e++ = 40;
 759         e += 40;
 760
 761         *e++ = 57;              /* set extension buffer size for reply */
 762         *e++ = 2;
 763         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
 764         *e++ = 150;
 765
 766         *e++ = 255;             /* End of the list */
 767 }
 768
 769
 770 /*
 771  *  Initialize the DHCP/BOOTP mechanism.
 772  */
 773 static inline void __init ic_bootp_init(void)
 774 {
 775         ic_nameservers_predef();
 776
 777         dev_add_pack(&bootp_packet_type);
 778 }
 779
 780
 781 /*
 782  *  DHCP/BOOTP cleanup.
 783  */
 784 static inline void __init ic_bootp_cleanup(void)
 785 {
 786         dev_remove_pack(&bootp_packet_type);
 787 }
 788
 789
 790 /*
 791  *  Send DHCP/BOOTP request to single interface.
 792  */
 793 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
 794 {
 795         struct net_device *dev = d->dev;
 796         struct sk_buff *skb;
 797         struct bootp_pkt *b;
 798         struct iphdr *h;
 799         int hlen = LL_RESERVED_SPACE(dev);
 800         int tlen = dev->needed_tailroom;
 801
 802         /* Allocate packet */
 803         skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
 804                         GFP_KERNEL);
 805         if (!skb)
 806                 return;
 807         skb_reserve(skb, hlen);
 808         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
 809         memset(b, 0, sizeof(struct bootp_pkt));
 810
 811         /* Construct IP header */
 812         skb_reset_network_header(skb);
 813         h = ip_hdr(skb);
 814         h->version = 4;
 815         h->ihl = 5;
 816         h->tot_len = htons(sizeof(struct bootp_pkt));
 817         h->frag_off = htons(IP_DF);
 818         h->ttl = 64;
 819         h->protocol = IPPROTO_UDP;
 820         h->daddr = htonl(INADDR_BROADCAST);
 821         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
 822
 823         /* Construct UDP header */
 824         b->udph.source = htons(68);
 825         b->udph.dest = htons(67);
 826         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
 827         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
 828
 829         /* Construct DHCP/BOOTP header */
 830         b->op = BOOTP_REQUEST;
 831         if (dev->type < 256) /* check for false types */
 832                 b->htype = dev->type;
 833         else if (dev->type == ARPHRD_FDDI)
 834                 b->htype = ARPHRD_ETHER;
 835         else {
 836                 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
 837                 b->htype = dev->type; /* can cause undefined behavior */
 838         }
 839
 840         /* server_ip and your_ip address are both already zero per RFC2131 */
 841         b->hlen = dev->addr_len;
 842         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
 843         b->secs = htons(jiffies_diff / HZ);
 844         b->xid = d->xid;
 845
 846         /* add DHCP options or BOOTP extensions */
 847 #ifdef IPCONFIG_DHCP
 848         if (ic_proto_enabled & IC_USE_DHCP)
 849                 ic_dhcp_init_options(b->exten);
 850         else
 851 #endif
 852                 ic_bootp_init_ext(b->exten);
 853
 854         /* Chain packet down the line... */
 855         skb->dev = dev;
 856         skb->protocol = htons(ETH_P_IP);
 857         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
 858                             dev->broadcast, dev->dev_addr, skb->len) < 0) {
 859                 kfree_skb(skb);
 860                 printk("E");
 861                 return;
 862         }
 863
 864         if (dev_queue_xmit(skb) < 0)
 865                 printk("E");
 866 }
 867
 868
 869 /*
 870  *  Copy BOOTP-supplied string if not already set.
 871  */
 872 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
 873 {
 874         if (!len)
 875                 return 0;
 876         if (len > max-1)
 877                 len = max-1;
 878         memcpy(dest, src, len);
 879         dest[len] = '\0';
 880         return 1;
 881 }
 882
 883
 884 /*
 885  *  Process BOOTP extensions.
 886  */
 887 static void __init ic_do_bootp_ext(u8 *ext)
 888 {
 889         u8 servers;
 890         int i;
 891         __be16 mtu;
 892
 893 #ifdef IPCONFIG_DEBUG
 894         u8 *c;
 895
 896         printk("DHCP/BOOTP: Got extension %d:",*ext);
 897         for (c=ext+2; c<ext+2+ext[1]; c++)
 898                 printk(" %02x", *c);
 899         printk("\n");
 900 #endif
 901
 902         switch (*ext++) {
 903         case 1:         /* Subnet mask */
 904                 if (ic_netmask == NONE)
 905                         memcpy(&ic_netmask, ext+1, 4);
 906                 break;
 907         case 3:         /* Default gateway */
 908                 if (ic_gateway == NONE)
 909                         memcpy(&ic_gateway, ext+1, 4);
 910                 break;
 911         case 6:         /* DNS server */
 912                 servers= *ext/4;
 913                 if (servers > CONF_NAMESERVERS_MAX)
 914                         servers = CONF_NAMESERVERS_MAX;
 915                 for (i = 0; i < servers; i++) {
 916                         if (ic_nameservers[i] == NONE)
 917                                 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
 918                 }
 919                 break;
 920         case 12:        /* Host name */
 921                 ic_bootp_string(utsname()->nodename, ext+1, *ext,
 922                                 __NEW_UTS_LEN);
 923                 ic_host_name_set = 1;
 924                 break;
 925         case 15:        /* Domain name (DNS) */
 926                 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
 927                 break;
 928         case 17:        /* Root path */
 929                 if (!root_server_path[0])
 930                         ic_bootp_string(root_server_path, ext+1, *ext,
 931                                         sizeof(root_server_path));
 932                 break;
 933         case 26:        /* Interface MTU */
 934                 memcpy(&mtu, ext+1, sizeof(mtu));
 935                 ic_dev_mtu = ntohs(mtu);
 936                 break;
 937         case 40:        /* NIS Domain name (_not_ DNS) */
 938                 ic_bootp_string(utsname()->domainname, ext+1, *ext,
 939                                 __NEW_UTS_LEN);
 940                 break;
 941         }
 942 }
 943
 944
 945 /*
 946  *  Receive BOOTP reply.
 947  */
 948 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 949 {
 950         struct bootp_pkt *b;
 951         struct iphdr *h;
 952         struct ic_device *d;
 953         int len, ext_len;
 954
 955         if (!net_eq(dev_net(dev), &init_net))
 956                 goto drop;
 957
 958         /* Perform verifications before taking the lock.  */
 959         if (skb->pkt_type == PACKET_OTHERHOST)
 960                 goto drop;
 961
 962         skb = skb_share_check(skb, GFP_ATOMIC);
 963         if (!skb)
 964                 return NET_RX_DROP;
 965
 966         if (!pskb_may_pull(skb,
 967                            sizeof(struct iphdr) +
 968                            sizeof(struct udphdr)))
 969                 goto drop;
 970
 971         b = (struct bootp_pkt *)skb_network_header(skb);
 972         h = &b->iph;
 973
 974         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
 975                 goto drop;
 976
 977         /* Fragments are not supported */
 978         if (ip_is_fragment(h)) {
 979                 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
 980                 goto drop;
 981         }
 982
 983         if (skb->len < ntohs(h->tot_len))
 984                 goto drop;
 985
 986         if (ip_fast_csum((char *) h, h->ihl))
 987                 goto drop;
 988
 989         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
 990                 goto drop;
 991
 992         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
 993                 goto drop;
 994
 995         len = ntohs(b->udph.len) - sizeof(struct udphdr);
 996         ext_len = len - (sizeof(*b) -
 997                          sizeof(struct iphdr) -
 998                          sizeof(struct udphdr) -
 999                          sizeof(b->exten));
1000         if (ext_len < 0)
1001                 goto drop;
1002
1003         /* Ok the front looks good, make sure we can get at the rest.  */
1004         if (!pskb_may_pull(skb, skb->len))
1005                 goto drop;
1006
1007         b = (struct bootp_pkt *)skb_network_header(skb);
1008         h = &b->iph;
1009
1010         /* One reply at a time, please. */
1011         spin_lock(&ic_recv_lock);
1012
1013         /* If we already have a reply, just drop the packet */
1014         if (ic_got_reply)
1015                 goto drop_unlock;
1016
1017         /* Find the ic_device that the packet arrived on */
1018         d = ic_first_dev;
1019         while (d && d->dev != dev)
1020                 d = d->next;
1021         if (!d)
1022                 goto drop_unlock;  /* should never happen */
1023
1024         /* Is it a reply to our BOOTP request? */
1025         if (b->op != BOOTP_REPLY ||
1026             b->xid != d->xid) {
1027                 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1028                                     b->op, b->xid);
1029                 goto drop_unlock;
1030         }
1031
1032         /* Is it a reply for the device we are configuring? */
1033         if (b->xid != ic_dev_xid) {
1034                 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1035                 goto drop_unlock;
1036         }
1037
1038         /* Parse extensions */
1039         if (ext_len >= 4 &&
1040             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1041                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1042                 u8 *ext;
1043
1044 #ifdef IPCONFIG_DHCP
1045                 if (ic_proto_enabled & IC_USE_DHCP) {
1046                         __be32 server_id = NONE;
1047                         int mt = 0;
1048
1049                         ext = &b->exten[4];
1050                         while (ext < end && *ext != 0xff) {
1051                                 u8 *opt = ext++;
1052                                 if (*opt == 0)  /* Padding */
1053                                         continue;
1054                                 ext += *ext + 1;
1055                                 if (ext >= end)
1056                                         break;
1057                                 switch (*opt) {
1058                                 case 53:        /* Message type */
1059                                         if (opt[1])
1060                                                 mt = opt[2];
1061                                         break;
1062                                 case 54:        /* Server ID (IP address) */
1063                                         if (opt[1] >= 4)
1064                                                 memcpy(&server_id, opt + 2, 4);
1065                                         break;
1066                                 }
1067                         }
1068
1069 #ifdef IPCONFIG_DEBUG
1070                         printk("DHCP: Got message type %d\n", mt);
1071 #endif
1072
1073                         switch (mt) {
1074                         case DHCPOFFER:
1075                                 /* While in the process of accepting one offer,
1076                                  * ignore all others.
1077                                  */
1078                                 if (ic_myaddr != NONE)
1079                                         goto drop_unlock;
1080
1081                                 /* Let's accept that offer. */
1082                                 ic_myaddr = b->your_ip;
1083                                 ic_servaddr = server_id;
1084 #ifdef IPCONFIG_DEBUG
1085                                 printk("DHCP: Offered address %pI4 by server %pI4\n",
1086                                        &ic_myaddr, &b->iph.saddr);
1087 #endif
1088                                 /* The DHCP indicated server address takes
1089                                  * precedence over the bootp header one if
1090                                  * they are different.
1091                                  */
1092                                 if ((server_id != NONE) &&
1093                                     (b->server_ip != server_id))
1094                                         b->server_ip = ic_servaddr;
1095                                 break;
1096
1097                         case DHCPACK:
1098                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1099                                         goto drop_unlock;
1100
1101                                 /* Yeah! */
1102                                 break;
1103
1104                         default:
1105                                 /* Urque.  Forget it*/
1106                                 ic_myaddr = NONE;
1107                                 ic_servaddr = NONE;
1108                                 goto drop_unlock;
1109                         }
1110
1111                         ic_dhcp_msgtype = mt;
1112
1113                 }
1114 #endif /* IPCONFIG_DHCP */
1115
1116                 ext = &b->exten[4];
1117                 while (ext < end && *ext != 0xff) {
1118                         u8 *opt = ext++;
1119                         if (*opt == 0)  /* Padding */
1120                                 continue;
1121                         ext += *ext + 1;
1122                         if (ext < end)
1123                                 ic_do_bootp_ext(opt);
1124                 }
1125         }
1126
1127         /* We have a winner! */
1128         ic_dev = dev;
1129         ic_myaddr = b->your_ip;
1130         ic_servaddr = b->server_ip;
1131         ic_addrservaddr = b->iph.saddr;
1132         if (ic_gateway == NONE && b->relay_ip)
1133                 ic_gateway = b->relay_ip;
1134         if (ic_nameservers[0] == NONE)
1135                 ic_nameservers[0] = ic_servaddr;
1136         ic_got_reply = IC_BOOTP;
1137
1138 drop_unlock:
1139         /* Show's over.  Nothing to see here.  */
1140         spin_unlock(&ic_recv_lock);
1141
1142 drop:
1143         /* Throw the packet out. */
1144         kfree_skb(skb);
1145
1146         return 0;
1147 }
1148
1149
1150 #endif
1151
1152
1153 /*
1154  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1155  */
1156
1157 #ifdef IPCONFIG_DYNAMIC
1158
1159 static int __init ic_dynamic(void)
1160 {
1161         int retries;
1162         struct ic_device *d;
1163         unsigned long start_jiffies, timeout, jiff;
1164         int do_bootp = ic_proto_have_if & IC_BOOTP;
1165         int do_rarp = ic_proto_have_if & IC_RARP;
1166
1167         /*
1168          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1169          * This routine gets only called when some pieces of information
1170          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1171          */
1172         if (!ic_proto_enabled) {
1173                 pr_err("IP-Config: Incomplete network configuration information\n");
1174                 return -1;
1175         }
1176
1177 #ifdef IPCONFIG_BOOTP
1178         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1179                 pr_err("DHCP/BOOTP: No suitable device found\n");
1180 #endif
1181 #ifdef IPCONFIG_RARP
1182         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1183                 pr_err("RARP: No suitable device found\n");
1184 #endif
1185
1186         if (!ic_proto_have_if)
1187                 /* Error message already printed */
1188                 return -1;
1189
1190         /*
1191          * Setup protocols
1192          */
1193 #ifdef IPCONFIG_BOOTP
1194         if (do_bootp)
1195                 ic_bootp_init();
1196 #endif
1197 #ifdef IPCONFIG_RARP
1198         if (do_rarp)
1199                 ic_rarp_init();
1200 #endif
1201
1202         /*
1203          * Send requests and wait, until we get an answer. This loop
1204          * seems to be a terrible waste of CPU time, but actually there is
1205          * only one process running at all, so we don't need to use any
1206          * scheduler functions.
1207          * [Actually we could now, but the nothing else running note still
1208          *  applies.. - AC]
1209          */
1210         pr_notice("Sending %s%s%s requests .",
1211                   do_bootp
1212                   ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1213                   (do_bootp && do_rarp) ? " and " : "",
1214                   do_rarp ? "RARP" : "");
1215
1216         start_jiffies = jiffies;
1217         d = ic_first_dev;
1218         retries = CONF_SEND_RETRIES;
1219         get_random_bytes(&timeout, sizeof(timeout));
1220         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1221         for (;;) {
1222 #ifdef IPCONFIG_BOOTP
1223                 /* Track the device we are configuring */
1224                 ic_dev_xid = d->xid;
1225
1226                 if (do_bootp && (d->able & IC_BOOTP))
1227                         ic_bootp_send_if(d, jiffies - start_jiffies);
1228 #endif
1229 #ifdef IPCONFIG_RARP
1230                 if (do_rarp && (d->able & IC_RARP))
1231                         ic_rarp_send_if(d);
1232 #endif
1233
1234                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1235                 while (time_before(jiffies, jiff) && !ic_got_reply)
1236                         schedule_timeout_uninterruptible(1);
1237 #ifdef IPCONFIG_DHCP
1238                 /* DHCP isn't done until we get a DHCPACK. */
1239                 if ((ic_got_reply & IC_BOOTP) &&
1240                     (ic_proto_enabled & IC_USE_DHCP) &&
1241                     ic_dhcp_msgtype != DHCPACK) {
1242                         ic_got_reply = 0;
1243                         pr_cont(",");
1244                         continue;
1245                 }
1246 #endif /* IPCONFIG_DHCP */
1247
1248                 if (ic_got_reply) {
1249                         pr_cont(" OK\n");
1250                         break;
1251                 }
1252
1253                 if ((d = d->next))
1254                         continue;
1255
1256                 if (! --retries) {
1257                         pr_cont(" timed out!\n");
1258                         break;
1259                 }
1260
1261                 d = ic_first_dev;
1262
1263                 timeout = timeout CONF_TIMEOUT_MULT;
1264                 if (timeout > CONF_TIMEOUT_MAX)
1265                         timeout = CONF_TIMEOUT_MAX;
1266
1267                 pr_cont(".");
1268         }
1269
1270 #ifdef IPCONFIG_BOOTP
1271         if (do_bootp)
1272                 ic_bootp_cleanup();
1273 #endif
1274 #ifdef IPCONFIG_RARP
1275         if (do_rarp)
1276                 ic_rarp_cleanup();
1277 #endif
1278
1279         if (!ic_got_reply) {
1280                 ic_myaddr = NONE;
1281                 return -1;
1282         }
1283
1284         printk("IP-Config: Got %s answer from %pI4, ",
1285                 ((ic_got_reply & IC_RARP) ? "RARP"
1286                  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1287                &ic_addrservaddr);
1288         pr_cont("my address is %pI4\n", &ic_myaddr);
1289
1290         return 0;
1291 }
1292
1293 #endif /* IPCONFIG_DYNAMIC */
1294
1295 #ifdef CONFIG_PROC_FS
1296
1297 static int pnp_seq_show(struct seq_file *seq, void *v)
1298 {
1299         int i;
1300
1301         if (ic_proto_used & IC_PROTO)
1302                 seq_printf(seq, "#PROTO: %s\n",
1303                            (ic_proto_used & IC_RARP) ? "RARP"
1304                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1305         else
1306                 seq_puts(seq, "#MANUAL\n");
1307
1308         if (ic_domain[0])
1309                 seq_printf(seq,
1310                            "domain %s\n", ic_domain);
1311         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1312                 if (ic_nameservers[i] != NONE)
1313                         seq_printf(seq, "nameserver %pI4\n",
1314                                    &ic_nameservers[i]);
1315         }
1316         if (ic_servaddr != NONE)
1317                 seq_printf(seq, "bootserver %pI4\n",
1318                            &ic_servaddr);
1319         return 0;
1320 }
1321
1322 static int pnp_seq_open(struct inode *indoe, struct file *file)
1323 {
1324         return single_open(file, pnp_seq_show, NULL);
1325 }
1326
1327 static const struct file_operations pnp_seq_fops = {
1328         .owner          = THIS_MODULE,
1329         .open           = pnp_seq_open,
1330         .read           = seq_read,
1331         .llseek         = seq_lseek,
1332         .release        = single_release,
1333 };
1334 #endif /* CONFIG_PROC_FS */
1335
1336 /*
1337  *  Extract IP address from the parameter string if needed. Note that we
1338  *  need to have root_server_addr set _before_ IPConfig gets called as it
1339  *  can override it.
1340  */
1341 __be32 __init root_nfs_parse_addr(char *name)
1342 {
1343         __be32 addr;
1344         int octets = 0;
1345         char *cp, *cq;
1346
1347         cp = cq = name;
1348         while (octets < 4) {
1349                 while (*cp >= '0' && *cp <= '9')
1350                         cp++;
1351                 if (cp == cq || cp - cq > 3)
1352                         break;
1353                 if (*cp == '.' || octets == 3)
1354                         octets++;
1355                 if (octets < 4)
1356                         cp++;
1357                 cq = cp;
1358         }
1359         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1360                 if (*cp == ':')
1361                         *cp++ = '\0';
1362                 addr = in_aton(name);
1363                 memmove(name, cp, strlen(cp) + 1);
1364         } else
1365                 addr = NONE;
1366
1367         return addr;
1368 }
1369
1370 #define DEVICE_WAIT_MAX         12 /* 12 seconds */
1371
1372 static int __init wait_for_devices(void)
1373 {
1374         int i;
1375
1376         for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1377                 struct net_device *dev;
1378                 int found = 0;
1379
1380                 rtnl_lock();
1381                 for_each_netdev(&init_net, dev) {
1382                         if (ic_is_init_dev(dev)) {
1383                                 found = 1;
1384                                 break;
1385                         }
1386                 }
1387                 rtnl_unlock();
1388                 if (found)
1389                         return 0;
1390                 ssleep(1);
1391         }
1392         return -ENODEV;
1393 }
1394
1395 /*
1396  *      IP Autoconfig dispatcher.
1397  */
1398
1399 static int __init ip_auto_config(void)
1400 {
1401         __be32 addr;
1402 #ifdef IPCONFIG_DYNAMIC
1403         int retries = CONF_OPEN_RETRIES;
1404 #endif
1405         int err;
1406         unsigned int i;
1407
1408 #ifdef CONFIG_PROC_FS
1409         proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1410 #endif /* CONFIG_PROC_FS */
1411
1412         if (!ic_enable)
1413                 return 0;
1414
1415         DBG(("IP-Config: Entered.\n"));
1416 #ifdef IPCONFIG_DYNAMIC
1417  try_try_again:
1418 #endif
1419         /* Wait for devices to appear */
1420         err = wait_for_devices();
1421         if (err)
1422                 return err;
1423
1424         /* Setup all network devices */
1425         err = ic_open_devs();
1426         if (err)
1427                 return err;
1428
1429         /* Give drivers a chance to settle */
1430         msleep(CONF_POST_OPEN);
1431
1432         /*
1433          * If the config information is insufficient (e.g., our IP address or
1434          * IP address of the boot server is missing or we have multiple network
1435          * interfaces and no default was set), use BOOTP or RARP to get the
1436          * missing values.
1437          */
1438         if (ic_myaddr == NONE ||
1439 #ifdef CONFIG_ROOT_NFS
1440             (root_server_addr == NONE &&
1441              ic_servaddr == NONE &&
1442              ROOT_DEV == Root_NFS) ||
1443 #endif
1444             ic_first_dev->next) {
1445 #ifdef IPCONFIG_DYNAMIC
1446                 if (ic_dynamic() < 0) {
1447                         ic_close_devs();
1448
1449                         /*
1450                          * I don't know why, but sometimes the
1451                          * eepro100 driver (at least) gets upset and
1452                          * doesn't work the first time it's opened.
1453                          * But then if you close it and reopen it, it
1454                          * works just fine.  So we need to try that at
1455                          * least once before giving up.
1456                          *
1457                          * Also, if the root will be NFS-mounted, we
1458                          * have nowhere to go if DHCP fails.  So we
1459                          * just have to keep trying forever.
1460                          *
1461                          *                              -- Chip
1462                          */
1463 #ifdef CONFIG_ROOT_NFS
1464                         if (ROOT_DEV ==  Root_NFS) {
1465                                 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1466                                 goto try_try_again;
1467                         }
1468 #endif
1469
1470                         if (--retries) {
1471                                 pr_err("IP-Config: Reopening network devices...\n");
1472                                 goto try_try_again;
1473                         }
1474
1475                         /* Oh, well.  At least we tried. */
1476                         pr_err("IP-Config: Auto-configuration of network failed\n");
1477                         return -1;
1478                 }
1479 #else /* !DYNAMIC */
1480                 pr_err("IP-Config: Incomplete network configuration information\n");
1481                 ic_close_devs();
1482                 return -1;
1483 #endif /* IPCONFIG_DYNAMIC */
1484         } else {
1485                 /* Device selected manually or only one device -> use it */
1486                 ic_dev = ic_first_dev->dev;
1487         }
1488
1489         addr = root_nfs_parse_addr(root_server_path);
1490         if (root_server_addr == NONE)
1491                 root_server_addr = addr;
1492
1493         /*
1494          * Use defaults wherever applicable.
1495          */
1496         if (ic_defaults() < 0)
1497                 return -1;
1498
1499         /*
1500          * Close all network devices except the device we've
1501          * autoconfigured and set up routes.
1502          */
1503         ic_close_devs();
1504         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1505                 return -1;
1506
1507         /*
1508          * Record which protocol was actually used.
1509          */
1510 #ifdef IPCONFIG_DYNAMIC
1511         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1512 #endif
1513
1514 #ifndef IPCONFIG_SILENT
1515         /*
1516          * Clue in the operator.
1517          */
1518         pr_info("IP-Config: Complete:\n");
1519
1520         pr_info("     device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1521                 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr,
1522                 &ic_myaddr, &ic_netmask, &ic_gateway);
1523         pr_info("     host=%s, domain=%s, nis-domain=%s\n",
1524                 utsname()->nodename, ic_domain, utsname()->domainname);
1525         pr_info("     bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1526                 &ic_servaddr, &root_server_addr, root_server_path);
1527         if (ic_dev_mtu)
1528                 pr_cont(", mtu=%d", ic_dev_mtu);
1529         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1530                 if (ic_nameservers[i] != NONE) {
1531                         pr_info("     nameserver%u=%pI4",
1532                                 i, &ic_nameservers[i]);
1533                         break;
1534                 }
1535         for (i++; i < CONF_NAMESERVERS_MAX; i++)
1536                 if (ic_nameservers[i] != NONE)
1537                         pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1538         pr_cont("\n");
1539 #endif /* !SILENT */
1540
1541         return 0;
1542 }
1543
1544 late_initcall(ip_auto_config);
1545
1546
1547 /*
1548  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1549  *  command line parameter.  See Documentation/filesystems/nfs/nfsroot.txt.
1550  */
1551 static int __init ic_proto_name(char *name)
1552 {
1553         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1554                 return 1;
1555         }
1556         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1557                 return 0;
1558         }
1559 #ifdef CONFIG_IP_PNP_DHCP
1560         else if (!strcmp(name, "dhcp")) {
1561                 ic_proto_enabled &= ~IC_RARP;
1562                 return 1;
1563         }
1564 #endif
1565 #ifdef CONFIG_IP_PNP_BOOTP
1566         else if (!strcmp(name, "bootp")) {
1567                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1568                 return 1;
1569         }
1570 #endif
1571 #ifdef CONFIG_IP_PNP_RARP
1572         else if (!strcmp(name, "rarp")) {
1573                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1574                 return 1;
1575         }
1576 #endif
1577 #ifdef IPCONFIG_DYNAMIC
1578         else if (!strcmp(name, "both")) {
1579                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1580                 return 1;
1581         }
1582 #endif
1583         return 0;
1584 }
1585
1586 static int __init ip_auto_config_setup(char *addrs)
1587 {
1588         char *cp, *ip, *dp;
1589         int num = 0;
1590
1591         ic_set_manually = 1;
1592         ic_enable = 1;
1593
1594         /*
1595          * If any dhcp, bootp etc options are set, leave autoconfig on
1596          * and skip the below static IP processing.
1597          */
1598         if (ic_proto_name(addrs))
1599                 return 1;
1600
1601         /* If no static IP is given, turn off autoconfig and bail.  */
1602         if (*addrs == 0 ||
1603             strcmp(addrs, "off") == 0 ||
1604             strcmp(addrs, "none") == 0) {
1605                 ic_enable = 0;
1606                 return 1;
1607         }
1608
1609         ic_nameservers_predef();
1610
1611         /* Parse string for static IP assignment.  */
1612         ip = addrs;
1613         while (ip && *ip) {
1614                 if ((cp = strchr(ip, ':')))
1615                         *cp++ = '\0';
1616                 if (strlen(ip) > 0) {
1617                         DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1618                         switch (num) {
1619                         case 0:
1620                                 if ((ic_myaddr = in_aton(ip)) == ANY)
1621                                         ic_myaddr = NONE;
1622                                 break;
1623                         case 1:
1624                                 if ((ic_servaddr = in_aton(ip)) == ANY)
1625                                         ic_servaddr = NONE;
1626                                 break;
1627                         case 2:
1628                                 if ((ic_gateway = in_aton(ip)) == ANY)
1629                                         ic_gateway = NONE;
1630                                 break;
1631                         case 3:
1632                                 if ((ic_netmask = in_aton(ip)) == ANY)
1633                                         ic_netmask = NONE;
1634                                 break;
1635                         case 4:
1636                                 if ((dp = strchr(ip, '.'))) {
1637                                         *dp++ = '\0';
1638                                         strlcpy(utsname()->domainname, dp,
1639                                                 sizeof(utsname()->domainname));
1640                                 }
1641                                 strlcpy(utsname()->nodename, ip,
1642                                         sizeof(utsname()->nodename));
1643                                 ic_host_name_set = 1;
1644                                 break;
1645                         case 5:
1646                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1647                                 break;
1648                         case 6:
1649                                 if (ic_proto_name(ip) == 0 &&
1650                                     ic_myaddr == NONE) {
1651                                         ic_enable = 0;
1652                                 }
1653                                 break;
1654                         case 7:
1655                                 if (CONF_NAMESERVERS_MAX >= 1) {
1656                                         ic_nameservers[0] = in_aton(ip);
1657                                         if (ic_nameservers[0] == ANY)
1658                                                 ic_nameservers[0] = NONE;
1659                                 }
1660                                 break;
1661                         case 8:
1662                                 if (CONF_NAMESERVERS_MAX >= 2) {
1663                                         ic_nameservers[1] = in_aton(ip);
1664                                         if (ic_nameservers[1] == ANY)
1665                                                 ic_nameservers[1] = NONE;
1666                                 }
1667                                 break;
1668                         }
1669                 }
1670                 ip = cp;
1671                 num++;
1672         }
1673
1674         return 1;
1675 }
1676 __setup("ip=", ip_auto_config_setup);
1677
1678 static int __init nfsaddrs_config_setup(char *addrs)
1679 {
1680         return ip_auto_config_setup(addrs);
1681 }
1682 __setup("nfsaddrs=", nfsaddrs_config_setup);
1683
1684 static int __init vendor_class_identifier_setup(char *addrs)
1685 {
1686         if (strlcpy(vendor_class_identifier, addrs,
1687                     sizeof(vendor_class_identifier))
1688             >= sizeof(vendor_class_identifier))
1689                 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"",
1690                         vendor_class_identifier);
1691         return 1;
1692 }
1693 __setup("dhcpclass=", vendor_class_identifier_setup);