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 #if defined(CONFIG_IP_PNP_DHCP)
  69 #define IPCONFIG_DHCP
  70 #endif
  71 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
  72 #define IPCONFIG_BOOTP
  73 #endif
  74 #if defined(CONFIG_IP_PNP_RARP)
  75 #define IPCONFIG_RARP
  76 #endif
  77 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
  78 #define IPCONFIG_DYNAMIC
  79 #endif
  80
  81 /* Define the friendly delay before and after opening net devices */
  82 #define CONF_POST_OPEN          10      /* After opening: 10 msecs */
  83 #define CONF_CARRIER_TIMEOUT    120000  /* Wait for carrier timeout */
  84
  85 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
  86 #define CONF_OPEN_RETRIES       2       /* (Re)open devices twice */
  87 #define CONF_SEND_RETRIES       6       /* Send six requests per open */
  88 #define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
  89 #define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
  90 #define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
  91 #define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
  92 #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
  93                                            - '3' from resolv.h */
  94
  95 #define NONE cpu_to_be32(INADDR_NONE)
  96 #define ANY cpu_to_be32(INADDR_ANY)
  97
  98 /*
  99  * Public IP configuration
 100  */
 101
 102 /* This is used by platforms which might be able to set the ipconfig
 103  * variables using firmware environment vars.  If this is set, it will
 104  * ignore such firmware variables.
 105  */
 106 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
 107
 108 static int ic_enable __initdata;                /* IP config enabled? */
 109
 110 /* Protocol choice */
 111 int ic_proto_enabled __initdata = 0
 112 #ifdef IPCONFIG_BOOTP
 113                         | IC_BOOTP
 114 #endif
 115 #ifdef CONFIG_IP_PNP_DHCP
 116                         | IC_USE_DHCP
 117 #endif
 118 #ifdef IPCONFIG_RARP
 119                         | IC_RARP
 120 #endif
 121                         ;
 122
 123 static int ic_host_name_set __initdata; /* Host name set by us? */
 124
 125 __be32 ic_myaddr = NONE;                /* My IP address */
 126 static __be32 ic_netmask = NONE;        /* Netmask for local subnet */
 127 __be32 ic_gateway = NONE;       /* Gateway IP address */
 128
 129 #ifdef IPCONFIG_DYNAMIC
 130 static __be32 ic_addrservaddr = NONE;   /* IP Address of the IP addresses'server */
 131 #endif
 132
 133 __be32 ic_servaddr = NONE;      /* Boot server IP address */
 134
 135 __be32 root_server_addr = NONE; /* Address of NFS server */
 136 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
 137
 138 /* vendor class identifier */
 139 static char vendor_class_identifier[253] __initdata;
 140
 141 #if defined(CONFIG_IP_PNP_DHCP)
 142 static char dhcp_client_identifier[253] __initdata;
 143 #endif
 144
 145 /* Persistent data: */
 146
 147 #ifdef IPCONFIG_DYNAMIC
 148 static int ic_proto_used;                       /* Protocol used, if any */
 149 #else
 150 #define ic_proto_used 0
 151 #endif
 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 ic_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\n",
 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                         pr_debug("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 ((!ic_dev || dev != ic_dev->dev) && !netdev_uses_dsa(dev)) {
 310                         pr_debug("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->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->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                 pr_notice("IP-Config: Guessing netmask %pI4\n",
 464                           &ic_netmask);
 465         }
 466
 467         return 0;
 468 }
 469
 470 /*
 471  *      RARP support.
 472  */
 473
 474 #ifdef IPCONFIG_RARP
 475
 476 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 477
 478 static struct packet_type rarp_packet_type __initdata = {
 479         .type = cpu_to_be16(ETH_P_RARP),
 480         .func = ic_rarp_recv,
 481 };
 482
 483 static inline void __init ic_rarp_init(void)
 484 {
 485         dev_add_pack(&rarp_packet_type);
 486 }
 487
 488 static inline void __init ic_rarp_cleanup(void)
 489 {
 490         dev_remove_pack(&rarp_packet_type);
 491 }
 492
 493 /*
 494  *  Process received RARP packet.
 495  */
 496 static int __init
 497 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 498 {
 499         struct arphdr *rarp;
 500         unsigned char *rarp_ptr;
 501         __be32 sip, tip;
 502         unsigned char *tha;             /* t for "target" */
 503         struct ic_device *d;
 504
 505         if (!net_eq(dev_net(dev), &init_net))
 506                 goto drop;
 507
 508         skb = skb_share_check(skb, GFP_ATOMIC);
 509         if (!skb)
 510                 return NET_RX_DROP;
 511
 512         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
 513                 goto drop;
 514
 515         /* Basic sanity checks can be done without the lock.  */
 516         rarp = (struct arphdr *)skb_transport_header(skb);
 517
 518         /* If this test doesn't pass, it's not IP, or we should
 519          * ignore it anyway.
 520          */
 521         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
 522                 goto drop;
 523
 524         /* If it's not a RARP reply, delete it. */
 525         if (rarp->ar_op != htons(ARPOP_RREPLY))
 526                 goto drop;
 527
 528         /* If it's not Ethernet, delete it. */
 529         if (rarp->ar_pro != htons(ETH_P_IP))
 530                 goto drop;
 531
 532         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
 533                 goto drop;
 534
 535         /* OK, it is all there and looks valid, process... */
 536         rarp = (struct arphdr *)skb_transport_header(skb);
 537         rarp_ptr = (unsigned char *) (rarp + 1);
 538
 539         /* One reply at a time, please. */
 540         spin_lock(&ic_recv_lock);
 541
 542         /* If we already have a reply, just drop the packet */
 543         if (ic_got_reply)
 544                 goto drop_unlock;
 545
 546         /* Find the ic_device that the packet arrived on */
 547         d = ic_first_dev;
 548         while (d && d->dev != dev)
 549                 d = d->next;
 550         if (!d)
 551                 goto drop_unlock;       /* should never happen */
 552
 553         /* Extract variable-width fields */
 554         rarp_ptr += dev->addr_len;
 555         memcpy(&sip, rarp_ptr, 4);
 556         rarp_ptr += 4;
 557         tha = rarp_ptr;
 558         rarp_ptr += dev->addr_len;
 559         memcpy(&tip, rarp_ptr, 4);
 560
 561         /* Discard packets which are not meant for us. */
 562         if (memcmp(tha, dev->dev_addr, dev->addr_len))
 563                 goto drop_unlock;
 564
 565         /* Discard packets which are not from specified server. */
 566         if (ic_servaddr != NONE && ic_servaddr != sip)
 567                 goto drop_unlock;
 568
 569         /* We have a winner! */
 570         ic_dev = d;
 571         if (ic_myaddr == NONE)
 572                 ic_myaddr = tip;
 573         ic_servaddr = sip;
 574         ic_addrservaddr = sip;
 575         ic_got_reply = IC_RARP;
 576
 577 drop_unlock:
 578         /* Show's over.  Nothing to see here.  */
 579         spin_unlock(&ic_recv_lock);
 580
 581 drop:
 582         /* Throw the packet out. */
 583         kfree_skb(skb);
 584         return 0;
 585 }
 586
 587
 588 /*
 589  *  Send RARP request packet over a single interface.
 590  */
 591 static void __init ic_rarp_send_if(struct ic_device *d)
 592 {
 593         struct net_device *dev = d->dev;
 594         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
 595                  dev->dev_addr, dev->dev_addr);
 596 }
 597 #endif
 598
 599 /*
 600  *  Predefine Nameservers
 601  */
 602 static inline void __init ic_nameservers_predef(void)
 603 {
 604         int i;
 605
 606         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
 607                 ic_nameservers[i] = NONE;
 608 }
 609
 610 /*
 611  *      DHCP/BOOTP support.
 612  */
 613
 614 #ifdef IPCONFIG_BOOTP
 615
 616 struct bootp_pkt {              /* BOOTP packet format */
 617         struct iphdr iph;       /* IP header */
 618         struct udphdr udph;     /* UDP header */
 619         u8 op;                  /* 1=request, 2=reply */
 620         u8 htype;               /* HW address type */
 621         u8 hlen;                /* HW address length */
 622         u8 hops;                /* Used only by gateways */
 623         __be32 xid;             /* Transaction ID */
 624         __be16 secs;            /* Seconds since we started */
 625         __be16 flags;           /* Just what it says */
 626         __be32 client_ip;               /* Client's IP address if known */
 627         __be32 your_ip;         /* Assigned IP address */
 628         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
 629         __be32 relay_ip;                /* IP address of BOOTP relay */
 630         u8 hw_addr[16];         /* Client's HW address */
 631         u8 serv_name[64];       /* Server host name */
 632         u8 boot_file[128];      /* Name of boot file */
 633         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
 634 };
 635
 636 /* packet ops */
 637 #define BOOTP_REQUEST   1
 638 #define BOOTP_REPLY     2
 639
 640 /* DHCP message types */
 641 #define DHCPDISCOVER    1
 642 #define DHCPOFFER       2
 643 #define DHCPREQUEST     3
 644 #define DHCPDECLINE     4
 645 #define DHCPACK         5
 646 #define DHCPNAK         6
 647 #define DHCPRELEASE     7
 648 #define DHCPINFORM      8
 649
 650 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 651
 652 static struct packet_type bootp_packet_type __initdata = {
 653         .type = cpu_to_be16(ETH_P_IP),
 654         .func = ic_bootp_recv,
 655 };
 656
 657 /*
 658  *  Initialize DHCP/BOOTP extension fields in the request.
 659  */
 660
 661 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
 662
 663 #ifdef IPCONFIG_DHCP
 664
 665 static void __init
 666 ic_dhcp_init_options(u8 *options, struct ic_device *d)
 667 {
 668         u8 mt = ((ic_servaddr == NONE)
 669                  ? DHCPDISCOVER : DHCPREQUEST);
 670         u8 *e = options;
 671         int len;
 672
 673         pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name);
 674
 675         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 676         e += 4;
 677
 678         *e++ = 53;              /* DHCP message type */
 679         *e++ = 1;
 680         *e++ = mt;
 681
 682         if (mt == DHCPREQUEST) {
 683                 *e++ = 54;      /* Server ID (IP address) */
 684                 *e++ = 4;
 685                 memcpy(e, &ic_servaddr, 4);
 686                 e += 4;
 687
 688                 *e++ = 50;      /* Requested IP address */
 689                 *e++ = 4;
 690                 memcpy(e, &ic_myaddr, 4);
 691                 e += 4;
 692         }
 693
 694         /* always? */
 695         {
 696                 static const u8 ic_req_params[] = {
 697                         1,      /* Subnet mask */
 698                         3,      /* Default gateway */
 699                         6,      /* DNS server */
 700                         12,     /* Host name */
 701                         15,     /* Domain name */
 702                         17,     /* Boot path */
 703                         26,     /* MTU */
 704                         40,     /* NIS domain name */
 705                 };
 706
 707                 *e++ = 55;      /* Parameter request list */
 708                 *e++ = sizeof(ic_req_params);
 709                 memcpy(e, ic_req_params, sizeof(ic_req_params));
 710                 e += sizeof(ic_req_params);
 711
 712                 if (ic_host_name_set) {
 713                         *e++ = 12;      /* host-name */
 714                         len = strlen(utsname()->nodename);
 715                         *e++ = len;
 716                         memcpy(e, utsname()->nodename, len);
 717                         e += len;
 718                 }
 719                 if (*vendor_class_identifier) {
 720                         pr_info("DHCP: sending class identifier \"%s\"\n",
 721                                 vendor_class_identifier);
 722                         *e++ = 60;      /* Class-identifier */
 723                         len = strlen(vendor_class_identifier);
 724                         *e++ = len;
 725                         memcpy(e, vendor_class_identifier, len);
 726                         e += len;
 727                 }
 728                 len = strlen(dhcp_client_identifier + 1);
 729                 /* the minimum length of identifier is 2, include 1 byte type,
 730                  * and can not be larger than the length of options
 731                  */
 732                 if (len >= 1 && len < 312 - (e - options) - 1) {
 733                         *e++ = 61;
 734                         *e++ = len + 1;
 735                         memcpy(e, dhcp_client_identifier, len + 1);
 736                         e += len + 1;
 737                 }
 738         }
 739
 740         *e++ = 255;     /* End of the list */
 741 }
 742
 743 #endif /* IPCONFIG_DHCP */
 744
 745 static void __init ic_bootp_init_ext(u8 *e)
 746 {
 747         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 748         e += 4;
 749         *e++ = 1;               /* Subnet mask request */
 750         *e++ = 4;
 751         e += 4;
 752         *e++ = 3;               /* Default gateway request */
 753         *e++ = 4;
 754         e += 4;
 755         *e++ = 5;               /* Name server request */
 756         *e++ = 8;
 757         e += 8;
 758         *e++ = 12;              /* Host name request */
 759         *e++ = 32;
 760         e += 32;
 761         *e++ = 40;              /* NIS Domain name request */
 762         *e++ = 32;
 763         e += 32;
 764         *e++ = 17;              /* Boot path */
 765         *e++ = 40;
 766         e += 40;
 767
 768         *e++ = 57;              /* set extension buffer size for reply */
 769         *e++ = 2;
 770         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
 771         *e++ = 150;
 772
 773         *e++ = 255;             /* End of the list */
 774 }
 775
 776
 777 /*
 778  *  Initialize the DHCP/BOOTP mechanism.
 779  */
 780 static inline void __init ic_bootp_init(void)
 781 {
 782         ic_nameservers_predef();
 783
 784         dev_add_pack(&bootp_packet_type);
 785 }
 786
 787
 788 /*
 789  *  DHCP/BOOTP cleanup.
 790  */
 791 static inline void __init ic_bootp_cleanup(void)
 792 {
 793         dev_remove_pack(&bootp_packet_type);
 794 }
 795
 796
 797 /*
 798  *  Send DHCP/BOOTP request to single interface.
 799  */
 800 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
 801 {
 802         struct net_device *dev = d->dev;
 803         struct sk_buff *skb;
 804         struct bootp_pkt *b;
 805         struct iphdr *h;
 806         int hlen = LL_RESERVED_SPACE(dev);
 807         int tlen = dev->needed_tailroom;
 808
 809         /* Allocate packet */
 810         skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
 811                         GFP_KERNEL);
 812         if (!skb)
 813                 return;
 814         skb_reserve(skb, hlen);
 815         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
 816         memset(b, 0, sizeof(struct bootp_pkt));
 817
 818         /* Construct IP header */
 819         skb_reset_network_header(skb);
 820         h = ip_hdr(skb);
 821         h->version = 4;
 822         h->ihl = 5;
 823         h->tot_len = htons(sizeof(struct bootp_pkt));
 824         h->frag_off = htons(IP_DF);
 825         h->ttl = 64;
 826         h->protocol = IPPROTO_UDP;
 827         h->daddr = htonl(INADDR_BROADCAST);
 828         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
 829
 830         /* Construct UDP header */
 831         b->udph.source = htons(68);
 832         b->udph.dest = htons(67);
 833         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
 834         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
 835
 836         /* Construct DHCP/BOOTP header */
 837         b->op = BOOTP_REQUEST;
 838         if (dev->type < 256) /* check for false types */
 839                 b->htype = dev->type;
 840         else if (dev->type == ARPHRD_FDDI)
 841                 b->htype = ARPHRD_ETHER;
 842         else {
 843                 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type,
 844                         dev->name);
 845                 b->htype = dev->type; /* can cause undefined behavior */
 846         }
 847
 848         /* server_ip and your_ip address are both already zero per RFC2131 */
 849         b->hlen = dev->addr_len;
 850         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
 851         b->secs = htons(jiffies_diff / HZ);
 852         b->xid = d->xid;
 853
 854         /* add DHCP options or BOOTP extensions */
 855 #ifdef IPCONFIG_DHCP
 856         if (ic_proto_enabled & IC_USE_DHCP)
 857                 ic_dhcp_init_options(b->exten, d);
 858         else
 859 #endif
 860                 ic_bootp_init_ext(b->exten);
 861
 862         /* Chain packet down the line... */
 863         skb->dev = dev;
 864         skb->protocol = htons(ETH_P_IP);
 865         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
 866                             dev->broadcast, dev->dev_addr, skb->len) < 0) {
 867                 kfree_skb(skb);
 868                 printk("E");
 869                 return;
 870         }
 871
 872         if (dev_queue_xmit(skb) < 0)
 873                 printk("E");
 874 }
 875
 876
 877 /*
 878  *  Copy BOOTP-supplied string if not already set.
 879  */
 880 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
 881 {
 882         if (!len)
 883                 return 0;
 884         if (len > max-1)
 885                 len = max-1;
 886         memcpy(dest, src, len);
 887         dest[len] = '\0';
 888         return 1;
 889 }
 890
 891
 892 /*
 893  *  Process BOOTP extensions.
 894  */
 895 static void __init ic_do_bootp_ext(u8 *ext)
 896 {
 897         u8 servers;
 898         int i;
 899         __be16 mtu;
 900
 901         u8 *c;
 902
 903         pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
 904         for (c=ext+2; c<ext+2+ext[1]; c++)
 905                 pr_debug(" %02x", *c);
 906         pr_debug("\n");
 907
 908         switch (*ext++) {
 909         case 1:         /* Subnet mask */
 910                 if (ic_netmask == NONE)
 911                         memcpy(&ic_netmask, ext+1, 4);
 912                 break;
 913         case 3:         /* Default gateway */
 914                 if (ic_gateway == NONE)
 915                         memcpy(&ic_gateway, ext+1, 4);
 916                 break;
 917         case 6:         /* DNS server */
 918                 servers= *ext/4;
 919                 if (servers > CONF_NAMESERVERS_MAX)
 920                         servers = CONF_NAMESERVERS_MAX;
 921                 for (i = 0; i < servers; i++) {
 922                         if (ic_nameservers[i] == NONE)
 923                                 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
 924                 }
 925                 break;
 926         case 12:        /* Host name */
 927                 ic_bootp_string(utsname()->nodename, ext+1, *ext,
 928                                 __NEW_UTS_LEN);
 929                 ic_host_name_set = 1;
 930                 break;
 931         case 15:        /* Domain name (DNS) */
 932                 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
 933                 break;
 934         case 17:        /* Root path */
 935                 if (!root_server_path[0])
 936                         ic_bootp_string(root_server_path, ext+1, *ext,
 937                                         sizeof(root_server_path));
 938                 break;
 939         case 26:        /* Interface MTU */
 940                 memcpy(&mtu, ext+1, sizeof(mtu));
 941                 ic_dev_mtu = ntohs(mtu);
 942                 break;
 943         case 40:        /* NIS Domain name (_not_ DNS) */
 944                 ic_bootp_string(utsname()->domainname, ext+1, *ext,
 945                                 __NEW_UTS_LEN);
 946                 break;
 947         }
 948 }
 949
 950
 951 /*
 952  *  Receive BOOTP reply.
 953  */
 954 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 955 {
 956         struct bootp_pkt *b;
 957         struct iphdr *h;
 958         struct ic_device *d;
 959         int len, ext_len;
 960
 961         if (!net_eq(dev_net(dev), &init_net))
 962                 goto drop;
 963
 964         /* Perform verifications before taking the lock.  */
 965         if (skb->pkt_type == PACKET_OTHERHOST)
 966                 goto drop;
 967
 968         skb = skb_share_check(skb, GFP_ATOMIC);
 969         if (!skb)
 970                 return NET_RX_DROP;
 971
 972         if (!pskb_may_pull(skb,
 973                            sizeof(struct iphdr) +
 974                            sizeof(struct udphdr)))
 975                 goto drop;
 976
 977         b = (struct bootp_pkt *)skb_network_header(skb);
 978         h = &b->iph;
 979
 980         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
 981                 goto drop;
 982
 983         /* Fragments are not supported */
 984         if (ip_is_fragment(h)) {
 985                 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
 986                 goto drop;
 987         }
 988
 989         if (skb->len < ntohs(h->tot_len))
 990                 goto drop;
 991
 992         if (ip_fast_csum((char *) h, h->ihl))
 993                 goto drop;
 994
 995         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
 996                 goto drop;
 997
 998         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
 999                 goto drop;
1000
1001         len = ntohs(b->udph.len) - sizeof(struct udphdr);
1002         ext_len = len - (sizeof(*b) -
1003                          sizeof(struct iphdr) -
1004                          sizeof(struct udphdr) -
1005                          sizeof(b->exten));
1006         if (ext_len < 0)
1007                 goto drop;
1008
1009         /* Ok the front looks good, make sure we can get at the rest.  */
1010         if (!pskb_may_pull(skb, skb->len))
1011                 goto drop;
1012
1013         b = (struct bootp_pkt *)skb_network_header(skb);
1014         h = &b->iph;
1015
1016         /* One reply at a time, please. */
1017         spin_lock(&ic_recv_lock);
1018
1019         /* If we already have a reply, just drop the packet */
1020         if (ic_got_reply)
1021                 goto drop_unlock;
1022
1023         /* Find the ic_device that the packet arrived on */
1024         d = ic_first_dev;
1025         while (d && d->dev != dev)
1026                 d = d->next;
1027         if (!d)
1028                 goto drop_unlock;  /* should never happen */
1029
1030         /* Is it a reply to our BOOTP request? */
1031         if (b->op != BOOTP_REPLY ||
1032             b->xid != d->xid) {
1033                 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n",
1034                                     d->dev->name, b->op, b->xid);
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                         pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name);
1070
1071                         switch (mt) {
1072                         case DHCPOFFER:
1073                                 /* While in the process of accepting one offer,
1074                                  * ignore all others.
1075                                  */
1076                                 if (ic_myaddr != NONE)
1077                                         goto drop_unlock;
1078
1079                                 /* Let's accept that offer. */
1080                                 ic_myaddr = b->your_ip;
1081                                 ic_servaddr = server_id;
1082                                 pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
1083                                          &ic_myaddr, &b->iph.saddr);
1084                                 /* The DHCP indicated server address takes
1085                                  * precedence over the bootp header one if
1086                                  * they are different.
1087                                  */
1088                                 if ((server_id != NONE) &&
1089                                     (b->server_ip != server_id))
1090                                         b->server_ip = ic_servaddr;
1091                                 break;
1092
1093                         case DHCPACK:
1094                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1095                                         goto drop_unlock;
1096
1097                                 /* Yeah! */
1098                                 break;
1099
1100                         default:
1101                                 /* Urque.  Forget it*/
1102                                 ic_myaddr = NONE;
1103                                 ic_servaddr = NONE;
1104                                 goto drop_unlock;
1105                         }
1106
1107                         ic_dhcp_msgtype = mt;
1108
1109                 }
1110 #endif /* IPCONFIG_DHCP */
1111
1112                 ext = &b->exten[4];
1113                 while (ext < end && *ext != 0xff) {
1114                         u8 *opt = ext++;
1115                         if (*opt == 0)  /* Padding */
1116                                 continue;
1117                         ext += *ext + 1;
1118                         if (ext < end)
1119                                 ic_do_bootp_ext(opt);
1120                 }
1121         }
1122
1123         /* We have a winner! */
1124         ic_dev = d;
1125         ic_myaddr = b->your_ip;
1126         ic_servaddr = b->server_ip;
1127         ic_addrservaddr = b->iph.saddr;
1128         if (ic_gateway == NONE && b->relay_ip)
1129                 ic_gateway = b->relay_ip;
1130         if (ic_nameservers[0] == NONE)
1131                 ic_nameservers[0] = ic_servaddr;
1132         ic_got_reply = IC_BOOTP;
1133
1134 drop_unlock:
1135         /* Show's over.  Nothing to see here.  */
1136         spin_unlock(&ic_recv_lock);
1137
1138 drop:
1139         /* Throw the packet out. */
1140         kfree_skb(skb);
1141
1142         return 0;
1143 }
1144
1145
1146 #endif
1147
1148
1149 /*
1150  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1151  */
1152
1153 #ifdef IPCONFIG_DYNAMIC
1154
1155 static int __init ic_dynamic(void)
1156 {
1157         int retries;
1158         struct ic_device *d;
1159         unsigned long start_jiffies, timeout, jiff;
1160         int do_bootp = ic_proto_have_if & IC_BOOTP;
1161         int do_rarp = ic_proto_have_if & IC_RARP;
1162
1163         /*
1164          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1165          * This routine gets only called when some pieces of information
1166          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1167          */
1168         if (!ic_proto_enabled) {
1169                 pr_err("IP-Config: Incomplete network configuration information\n");
1170                 return -1;
1171         }
1172
1173 #ifdef IPCONFIG_BOOTP
1174         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1175                 pr_err("DHCP/BOOTP: No suitable device found\n");
1176 #endif
1177 #ifdef IPCONFIG_RARP
1178         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1179                 pr_err("RARP: No suitable device found\n");
1180 #endif
1181
1182         if (!ic_proto_have_if)
1183                 /* Error message already printed */
1184                 return -1;
1185
1186         /*
1187          * Setup protocols
1188          */
1189 #ifdef IPCONFIG_BOOTP
1190         if (do_bootp)
1191                 ic_bootp_init();
1192 #endif
1193 #ifdef IPCONFIG_RARP
1194         if (do_rarp)
1195                 ic_rarp_init();
1196 #endif
1197
1198         /*
1199          * Send requests and wait, until we get an answer. This loop
1200          * seems to be a terrible waste of CPU time, but actually there is
1201          * only one process running at all, so we don't need to use any
1202          * scheduler functions.
1203          * [Actually we could now, but the nothing else running note still
1204          *  applies.. - AC]
1205          */
1206         pr_notice("Sending %s%s%s requests .",
1207                   do_bootp
1208                   ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1209                   (do_bootp && do_rarp) ? " and " : "",
1210                   do_rarp ? "RARP" : "");
1211
1212         start_jiffies = jiffies;
1213         d = ic_first_dev;
1214         retries = CONF_SEND_RETRIES;
1215         get_random_bytes(&timeout, sizeof(timeout));
1216         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1217         for (;;) {
1218 #ifdef IPCONFIG_BOOTP
1219                 if (do_bootp && (d->able & IC_BOOTP))
1220                         ic_bootp_send_if(d, jiffies - start_jiffies);
1221 #endif
1222 #ifdef IPCONFIG_RARP
1223                 if (do_rarp && (d->able & IC_RARP))
1224                         ic_rarp_send_if(d);
1225 #endif
1226
1227                 if (!d->next) {
1228                         jiff = jiffies + timeout;
1229                         while (time_before(jiffies, jiff) && !ic_got_reply)
1230                                 schedule_timeout_uninterruptible(1);
1231                 }
1232 #ifdef IPCONFIG_DHCP
1233                 /* DHCP isn't done until we get a DHCPACK. */
1234                 if ((ic_got_reply & IC_BOOTP) &&
1235                     (ic_proto_enabled & IC_USE_DHCP) &&
1236                     ic_dhcp_msgtype != DHCPACK) {
1237                         ic_got_reply = 0;
1238                         /* continue on device that got the reply */
1239                         d = ic_dev;
1240                         pr_cont(",");
1241                         continue;
1242                 }
1243 #endif /* IPCONFIG_DHCP */
1244
1245                 if (ic_got_reply) {
1246                         pr_cont(" OK\n");
1247                         break;
1248                 }
1249
1250                 if ((d = d->next))
1251                         continue;
1252
1253                 if (! --retries) {
1254                         pr_cont(" timed out!\n");
1255                         break;
1256                 }
1257
1258                 d = ic_first_dev;
1259
1260                 timeout = timeout CONF_TIMEOUT_MULT;
1261                 if (timeout > CONF_TIMEOUT_MAX)
1262                         timeout = CONF_TIMEOUT_MAX;
1263
1264                 pr_cont(".");
1265         }
1266
1267 #ifdef IPCONFIG_BOOTP
1268         if (do_bootp)
1269                 ic_bootp_cleanup();
1270 #endif
1271 #ifdef IPCONFIG_RARP
1272         if (do_rarp)
1273                 ic_rarp_cleanup();
1274 #endif
1275
1276         if (!ic_got_reply) {
1277                 ic_myaddr = NONE;
1278                 return -1;
1279         }
1280
1281         pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
1282                 ((ic_got_reply & IC_RARP) ? "RARP"
1283                 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1284                 &ic_addrservaddr, &ic_myaddr);
1285
1286         return 0;
1287 }
1288
1289 #endif /* IPCONFIG_DYNAMIC */
1290
1291 #ifdef CONFIG_PROC_FS
1292
1293 static int pnp_seq_show(struct seq_file *seq, void *v)
1294 {
1295         int i;
1296
1297         if (ic_proto_used & IC_PROTO)
1298                 seq_printf(seq, "#PROTO: %s\n",
1299                            (ic_proto_used & IC_RARP) ? "RARP"
1300                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1301         else
1302                 seq_puts(seq, "#MANUAL\n");
1303
1304         if (ic_domain[0])
1305                 seq_printf(seq,
1306                            "domain %s\n", ic_domain);
1307         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1308                 if (ic_nameservers[i] != NONE)
1309                         seq_printf(seq, "nameserver %pI4\n",
1310                                    &ic_nameservers[i]);
1311         }
1312         if (ic_servaddr != NONE)
1313                 seq_printf(seq, "bootserver %pI4\n",
1314                            &ic_servaddr);
1315         return 0;
1316 }
1317
1318 static int pnp_seq_open(struct inode *indoe, struct file *file)
1319 {
1320         return single_open(file, pnp_seq_show, NULL);
1321 }
1322
1323 static const struct file_operations pnp_seq_fops = {
1324         .owner          = THIS_MODULE,
1325         .open           = pnp_seq_open,
1326         .read           = seq_read,
1327         .llseek         = seq_lseek,
1328         .release        = single_release,
1329 };
1330 #endif /* CONFIG_PROC_FS */
1331
1332 /*
1333  *  Extract IP address from the parameter string if needed. Note that we
1334  *  need to have root_server_addr set _before_ IPConfig gets called as it
1335  *  can override it.
1336  */
1337 __be32 __init root_nfs_parse_addr(char *name)
1338 {
1339         __be32 addr;
1340         int octets = 0;
1341         char *cp, *cq;
1342
1343         cp = cq = name;
1344         while (octets < 4) {
1345                 while (*cp >= '0' && *cp <= '9')
1346                         cp++;
1347                 if (cp == cq || cp - cq > 3)
1348                         break;
1349                 if (*cp == '.' || octets == 3)
1350                         octets++;
1351                 if (octets < 4)
1352                         cp++;
1353                 cq = cp;
1354         }
1355         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1356                 if (*cp == ':')
1357                         *cp++ = '\0';
1358                 addr = in_aton(name);
1359                 memmove(name, cp, strlen(cp) + 1);
1360         } else
1361                 addr = NONE;
1362
1363         return addr;
1364 }
1365
1366 #define DEVICE_WAIT_MAX         12 /* 12 seconds */
1367
1368 static int __init wait_for_devices(void)
1369 {
1370         int i;
1371
1372         for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1373                 struct net_device *dev;
1374                 int found = 0;
1375
1376                 rtnl_lock();
1377                 for_each_netdev(&init_net, dev) {
1378                         if (ic_is_init_dev(dev)) {
1379                                 found = 1;
1380                                 break;
1381                         }
1382                 }
1383                 rtnl_unlock();
1384                 if (found)
1385                         return 0;
1386                 ssleep(1);
1387         }
1388         return -ENODEV;
1389 }
1390
1391 /*
1392  *      IP Autoconfig dispatcher.
1393  */
1394
1395 static int __init ip_auto_config(void)
1396 {
1397         __be32 addr;
1398 #ifdef IPCONFIG_DYNAMIC
1399         int retries = CONF_OPEN_RETRIES;
1400 #endif
1401         int err;
1402         unsigned int i;
1403
1404 #ifdef CONFIG_PROC_FS
1405         proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1406 #endif /* CONFIG_PROC_FS */
1407
1408         if (!ic_enable)
1409                 return 0;
1410
1411         pr_debug("IP-Config: Entered.\n");
1412 #ifdef IPCONFIG_DYNAMIC
1413  try_try_again:
1414 #endif
1415         /* Wait for devices to appear */
1416         err = wait_for_devices();
1417         if (err)
1418                 return err;
1419
1420         /* Setup all network devices */
1421         err = ic_open_devs();
1422         if (err)
1423                 return err;
1424
1425         /* Give drivers a chance to settle */
1426         msleep(CONF_POST_OPEN);
1427
1428         /*
1429          * If the config information is insufficient (e.g., our IP address or
1430          * IP address of the boot server is missing or we have multiple network
1431          * interfaces and no default was set), use BOOTP or RARP to get the
1432          * missing values.
1433          */
1434         if (ic_myaddr == NONE ||
1435 #ifdef CONFIG_ROOT_NFS
1436             (root_server_addr == NONE &&
1437              ic_servaddr == NONE &&
1438              ROOT_DEV == Root_NFS) ||
1439 #endif
1440             ic_first_dev->next) {
1441 #ifdef IPCONFIG_DYNAMIC
1442                 if (ic_dynamic() < 0) {
1443                         ic_close_devs();
1444
1445                         /*
1446                          * I don't know why, but sometimes the
1447                          * eepro100 driver (at least) gets upset and
1448                          * doesn't work the first time it's opened.
1449                          * But then if you close it and reopen it, it
1450                          * works just fine.  So we need to try that at
1451                          * least once before giving up.
1452                          *
1453                          * Also, if the root will be NFS-mounted, we
1454                          * have nowhere to go if DHCP fails.  So we
1455                          * just have to keep trying forever.
1456                          *
1457                          *                              -- Chip
1458                          */
1459 #ifdef CONFIG_ROOT_NFS
1460                         if (ROOT_DEV ==  Root_NFS) {
1461                                 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1462                                 goto try_try_again;
1463                         }
1464 #endif
1465
1466                         if (--retries) {
1467                                 pr_err("IP-Config: Reopening network devices...\n");
1468                                 goto try_try_again;
1469                         }
1470
1471                         /* Oh, well.  At least we tried. */
1472                         pr_err("IP-Config: Auto-configuration of network failed\n");
1473                         return -1;
1474                 }
1475 #else /* !DYNAMIC */
1476                 pr_err("IP-Config: Incomplete network configuration information\n");
1477                 ic_close_devs();
1478                 return -1;
1479 #endif /* IPCONFIG_DYNAMIC */
1480         } else {
1481                 /* Device selected manually or only one device -> use it */
1482                 ic_dev = ic_first_dev;
1483         }
1484
1485         addr = root_nfs_parse_addr(root_server_path);
1486         if (root_server_addr == NONE)
1487                 root_server_addr = addr;
1488
1489         /*
1490          * Use defaults wherever applicable.
1491          */
1492         if (ic_defaults() < 0)
1493                 return -1;
1494
1495         /*
1496          * Record which protocol was actually used.
1497          */
1498 #ifdef IPCONFIG_DYNAMIC
1499         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1500 #endif
1501
1502 #ifndef IPCONFIG_SILENT
1503         /*
1504          * Clue in the operator.
1505          */
1506         pr_info("IP-Config: Complete:\n");
1507
1508         pr_info("     device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1509                 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr,
1510                 &ic_myaddr, &ic_netmask, &ic_gateway);
1511         pr_info("     host=%s, domain=%s, nis-domain=%s\n",
1512                 utsname()->nodename, ic_domain, utsname()->domainname);
1513         pr_info("     bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1514                 &ic_servaddr, &root_server_addr, root_server_path);
1515         if (ic_dev_mtu)
1516                 pr_cont(", mtu=%d", ic_dev_mtu);
1517         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1518                 if (ic_nameservers[i] != NONE) {
1519                         pr_cont("     nameserver%u=%pI4",
1520                                 i, &ic_nameservers[i]);
1521                         break;
1522                 }
1523         for (i++; i < CONF_NAMESERVERS_MAX; i++)
1524                 if (ic_nameservers[i] != NONE)
1525                         pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1526         pr_cont("\n");
1527 #endif /* !SILENT */
1528
1529         /*
1530          * Close all network devices except the device we've
1531          * autoconfigured and set up routes.
1532          */
1533         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1534                 err = -1;
1535         else
1536                 err = 0;
1537
1538         ic_close_devs();
1539
1540         return err;
1541 }
1542
1543 late_initcall(ip_auto_config);
1544
1545
1546 /*
1547  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1548  *  command line parameter.  See Documentation/filesystems/nfs/nfsroot.txt.
1549  */
1550 static int __init ic_proto_name(char *name)
1551 {
1552         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1553                 return 1;
1554         }
1555         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1556                 return 0;
1557         }
1558 #ifdef CONFIG_IP_PNP_DHCP
1559         else if (!strncmp(name, "dhcp", 4)) {
1560                 char *client_id;
1561
1562                 ic_proto_enabled &= ~IC_RARP;
1563                 client_id = strstr(name, "dhcp,");
1564                 if (client_id) {
1565                         char *v;
1566
1567                         client_id = client_id + 5;
1568                         v = strchr(client_id, ',');
1569                         if (!v)
1570                                 return 1;
1571                         *v = 0;
1572                         if (kstrtou8(client_id, 0, dhcp_client_identifier))
1573                                 pr_debug("DHCP: Invalid client identifier type\n");
1574                         strncpy(dhcp_client_identifier + 1, v + 1, 251);
1575                         *v = ',';
1576                 }
1577                 return 1;
1578         }
1579 #endif
1580 #ifdef CONFIG_IP_PNP_BOOTP
1581         else if (!strcmp(name, "bootp")) {
1582                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1583                 return 1;
1584         }
1585 #endif
1586 #ifdef CONFIG_IP_PNP_RARP
1587         else if (!strcmp(name, "rarp")) {
1588                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1589                 return 1;
1590         }
1591 #endif
1592 #ifdef IPCONFIG_DYNAMIC
1593         else if (!strcmp(name, "both")) {
1594                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1595                 return 1;
1596         }
1597 #endif
1598         return 0;
1599 }
1600
1601 static int __init ip_auto_config_setup(char *addrs)
1602 {
1603         char *cp, *ip, *dp;
1604         int num = 0;
1605
1606         ic_set_manually = 1;
1607         ic_enable = 1;
1608
1609         /*
1610          * If any dhcp, bootp etc options are set, leave autoconfig on
1611          * and skip the below static IP processing.
1612          */
1613         if (ic_proto_name(addrs))
1614                 return 1;
1615
1616         /* If no static IP is given, turn off autoconfig and bail.  */
1617         if (*addrs == 0 ||
1618             strcmp(addrs, "off") == 0 ||
1619             strcmp(addrs, "none") == 0) {
1620                 ic_enable = 0;
1621                 return 1;
1622         }
1623
1624         ic_nameservers_predef();
1625
1626         /* Parse string for static IP assignment.  */
1627         ip = addrs;
1628         while (ip && *ip) {
1629                 if ((cp = strchr(ip, ':')))
1630                         *cp++ = '\0';
1631                 if (strlen(ip) > 0) {
1632                         pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip);
1633                         switch (num) {
1634                         case 0:
1635                                 if ((ic_myaddr = in_aton(ip)) == ANY)
1636                                         ic_myaddr = NONE;
1637                                 break;
1638                         case 1:
1639                                 if ((ic_servaddr = in_aton(ip)) == ANY)
1640                                         ic_servaddr = NONE;
1641                                 break;
1642                         case 2:
1643                                 if ((ic_gateway = in_aton(ip)) == ANY)
1644                                         ic_gateway = NONE;
1645                                 break;
1646                         case 3:
1647                                 if ((ic_netmask = in_aton(ip)) == ANY)
1648                                         ic_netmask = NONE;
1649                                 break;
1650                         case 4:
1651                                 if ((dp = strchr(ip, '.'))) {
1652                                         *dp++ = '\0';
1653                                         strlcpy(utsname()->domainname, dp,
1654                                                 sizeof(utsname()->domainname));
1655                                 }
1656                                 strlcpy(utsname()->nodename, ip,
1657                                         sizeof(utsname()->nodename));
1658                                 ic_host_name_set = 1;
1659                                 break;
1660                         case 5:
1661                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1662                                 break;
1663                         case 6:
1664                                 if (ic_proto_name(ip) == 0 &&
1665                                     ic_myaddr == NONE) {
1666                                         ic_enable = 0;
1667                                 }
1668                                 break;
1669                         case 7:
1670                                 if (CONF_NAMESERVERS_MAX >= 1) {
1671                                         ic_nameservers[0] = in_aton(ip);
1672                                         if (ic_nameservers[0] == ANY)
1673                                                 ic_nameservers[0] = NONE;
1674                                 }
1675                                 break;
1676                         case 8:
1677                                 if (CONF_NAMESERVERS_MAX >= 2) {
1678                                         ic_nameservers[1] = in_aton(ip);
1679                                         if (ic_nameservers[1] == ANY)
1680                                                 ic_nameservers[1] = NONE;
1681                                 }
1682                                 break;
1683                         }
1684                 }
1685                 ip = cp;
1686                 num++;
1687         }
1688
1689         return 1;
1690 }
1691 __setup("ip=", ip_auto_config_setup);
1692
1693 static int __init nfsaddrs_config_setup(char *addrs)
1694 {
1695         return ip_auto_config_setup(addrs);
1696 }
1697 __setup("nfsaddrs=", nfsaddrs_config_setup);
1698
1699 static int __init vendor_class_identifier_setup(char *addrs)
1700 {
1701         if (strlcpy(vendor_class_identifier, addrs,
1702                     sizeof(vendor_class_identifier))
1703             >= sizeof(vendor_class_identifier))
1704                 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
1705                         vendor_class_identifier);
1706         return 1;
1707 }
1708 __setup("dhcpclass=", vendor_class_identifier_setup);