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 = 0;            /* 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 = 0;     /* 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 __be32 ic_dev_xid;              /* Device under configuration */
 147
 148 /* vendor class identifier */
 149 static char vendor_class_identifier[253] __initdata;
 150
 151 /* Persistent data: */
 152
 153 static int ic_proto_used;                       /* Protocol used, if any */
 154 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
 155 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
 156
 157 /*
 158  * Private state.
 159  */
 160
 161 /* Name of user-selected boot device */
 162 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
 163
 164 /* Protocols supported by available interfaces */
 165 static int ic_proto_have_if __initdata = 0;
 166
 167 /* MTU for boot device */
 168 static int ic_dev_mtu __initdata = 0;
 169
 170 #ifdef IPCONFIG_DYNAMIC
 171 static DEFINE_SPINLOCK(ic_recv_lock);
 172 static volatile int ic_got_reply __initdata = 0;    /* Proto(s) that replied */
 173 #endif
 174 #ifdef IPCONFIG_DHCP
 175 static int ic_dhcp_msgtype __initdata = 0;      /* DHCP msg type received */
 176 #endif
 177
 178
 179 /*
 180  *      Network devices
 181  */
 182
 183 struct ic_device {
 184         struct ic_device *next;
 185         struct net_device *dev;
 186         unsigned short flags;
 187         short able;
 188         __be32 xid;
 189 };
 190
 191 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
 192 static struct net_device *ic_dev __initdata = NULL;     /* Selected device */
 193
 194 static bool __init ic_is_init_dev(struct net_device *dev)
 195 {
 196         if (dev->flags & IFF_LOOPBACK)
 197                 return false;
 198         return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
 199             (!(dev->flags & IFF_LOOPBACK) &&
 200              (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
 201              strncmp(dev->name, "dummy", 5));
 202 }
 203
 204 static int __init ic_open_devs(void)
 205 {
 206         struct ic_device *d, **last;
 207         struct net_device *dev;
 208         unsigned short oflags;
 209         unsigned long start;
 210
 211         last = &ic_first_dev;
 212         rtnl_lock();
 213
 214         /* bring loopback device up first */
 215         for_each_netdev(&init_net, dev) {
 216                 if (!(dev->flags & IFF_LOOPBACK))
 217                         continue;
 218                 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
 219                         pr_err("IP-Config: Failed to open %s\n", dev->name);
 220         }
 221
 222         for_each_netdev(&init_net, dev) {
 223                 if (ic_is_init_dev(dev)) {
 224                         int able = 0;
 225                         if (dev->mtu >= 364)
 226                                 able |= IC_BOOTP;
 227                         else
 228                                 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small",
 229                                         dev->name, dev->mtu);
 230                         if (!(dev->flags & IFF_NOARP))
 231                                 able |= IC_RARP;
 232                         able &= ic_proto_enabled;
 233                         if (ic_proto_enabled && !able)
 234                                 continue;
 235                         oflags = dev->flags;
 236                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
 237                                 pr_err("IP-Config: Failed to open %s\n",
 238                                        dev->name);
 239                                 continue;
 240                         }
 241                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
 242                                 rtnl_unlock();
 243                                 return -ENOMEM;
 244                         }
 245                         d->dev = dev;
 246                         *last = d;
 247                         last = &d->next;
 248                         d->flags = oflags;
 249                         d->able = able;
 250                         if (able & IC_BOOTP)
 251                                 get_random_bytes(&d->xid, sizeof(__be32));
 252                         else
 253                                 d->xid = 0;
 254                         ic_proto_have_if |= able;
 255                         DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
 256                                 dev->name, able, d->xid));
 257                 }
 258         }
 259
 260         /* no point in waiting if we could not bring up at least one device */
 261         if (!ic_first_dev)
 262                 goto have_carrier;
 263
 264         /* wait for a carrier on at least one device */
 265         start = jiffies;
 266         while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) {
 267                 for_each_netdev(&init_net, dev)
 268                         if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
 269                                 goto have_carrier;
 270
 271                 msleep(1);
 272         }
 273 have_carrier:
 274         rtnl_unlock();
 275
 276         *last = NULL;
 277
 278         if (!ic_first_dev) {
 279                 if (user_dev_name[0])
 280                         pr_err("IP-Config: Device `%s' not found\n",
 281                                user_dev_name);
 282                 else
 283                         pr_err("IP-Config: No network devices available\n");
 284                 return -ENODEV;
 285         }
 286         return 0;
 287 }
 288
 289 static void __init ic_close_devs(void)
 290 {
 291         struct ic_device *d, *next;
 292         struct net_device *dev;
 293
 294         rtnl_lock();
 295         next = ic_first_dev;
 296         while ((d = next)) {
 297                 next = d->next;
 298                 dev = d->dev;
 299                 if (dev != ic_dev) {
 300                         DBG(("IP-Config: Downing %s\n", dev->name));
 301                         dev_change_flags(dev, d->flags);
 302                 }
 303                 kfree(d);
 304         }
 305         rtnl_unlock();
 306 }
 307
 308 /*
 309  *      Interface to various network functions.
 310  */
 311
 312 static inline void
 313 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
 314 {
 315         sin->sin_family = AF_INET;
 316         sin->sin_addr.s_addr = addr;
 317         sin->sin_port = port;
 318 }
 319
 320 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
 321 {
 322         int res;
 323
 324         mm_segment_t oldfs = get_fs();
 325         set_fs(get_ds());
 326         res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
 327         set_fs(oldfs);
 328         return res;
 329 }
 330
 331 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
 332 {
 333         int res;
 334
 335         mm_segment_t oldfs = get_fs();
 336         set_fs(get_ds());
 337         res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
 338         set_fs(oldfs);
 339         return res;
 340 }
 341
 342 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
 343 {
 344         int res;
 345
 346         mm_segment_t oldfs = get_fs();
 347         set_fs(get_ds());
 348         res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
 349         set_fs(oldfs);
 350         return res;
 351 }
 352
 353 /*
 354  *      Set up interface addresses and routes.
 355  */
 356
 357 static int __init ic_setup_if(void)
 358 {
 359         struct ifreq ir;
 360         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
 361         int err;
 362
 363         memset(&ir, 0, sizeof(ir));
 364         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
 365         set_sockaddr(sin, ic_myaddr, 0);
 366         if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
 367                 pr_err("IP-Config: Unable to set interface address (%d)\n",
 368                        err);
 369                 return -1;
 370         }
 371         set_sockaddr(sin, ic_netmask, 0);
 372         if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
 373                 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
 374                        err);
 375                 return -1;
 376         }
 377         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
 378         if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
 379                 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
 380                        err);
 381                 return -1;
 382         }
 383         /* Handle the case where we need non-standard MTU on the boot link (a network
 384          * using jumbo frames, for instance).  If we can't set the mtu, don't error
 385          * out, we'll try to muddle along.
 386          */
 387         if (ic_dev_mtu != 0) {
 388                 strcpy(ir.ifr_name, ic_dev->name);
 389                 ir.ifr_mtu = ic_dev_mtu;
 390                 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
 391                         pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
 392                                ic_dev_mtu, err);
 393         }
 394         return 0;
 395 }
 396
 397 static int __init ic_setup_routes(void)
 398 {
 399         /* No need to setup device routes, only the default route... */
 400
 401         if (ic_gateway != NONE) {
 402                 struct rtentry rm;
 403                 int err;
 404
 405                 memset(&rm, 0, sizeof(rm));
 406                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
 407                         pr_err("IP-Config: Gateway not on directly connected network\n");
 408                         return -1;
 409                 }
 410                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
 411                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
 412                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
 413                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
 414                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
 415                         pr_err("IP-Config: Cannot add default route (%d)\n",
 416                                err);
 417                         return -1;
 418                 }
 419         }
 420
 421         return 0;
 422 }
 423
 424 /*
 425  *      Fill in default values for all missing parameters.
 426  */
 427
 428 static int __init ic_defaults(void)
 429 {
 430         /*
 431          *      At this point we have no userspace running so need not
 432          *      claim locks on system_utsname
 433          */
 434
 435         if (!ic_host_name_set)
 436                 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
 437
 438         if (root_server_addr == NONE)
 439                 root_server_addr = ic_servaddr;
 440
 441         if (ic_netmask == NONE) {
 442                 if (IN_CLASSA(ntohl(ic_myaddr)))
 443                         ic_netmask = htonl(IN_CLASSA_NET);
 444                 else if (IN_CLASSB(ntohl(ic_myaddr)))
 445                         ic_netmask = htonl(IN_CLASSB_NET);
 446                 else if (IN_CLASSC(ntohl(ic_myaddr)))
 447                         ic_netmask = htonl(IN_CLASSC_NET);
 448                 else {
 449                         pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
 450                                &ic_myaddr);
 451                         return -1;
 452                 }
 453                 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
 454         }
 455
 456         return 0;
 457 }
 458
 459 /*
 460  *      RARP support.
 461  */
 462
 463 #ifdef IPCONFIG_RARP
 464
 465 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 466
 467 static struct packet_type rarp_packet_type __initdata = {
 468         .type = cpu_to_be16(ETH_P_RARP),
 469         .func = ic_rarp_recv,
 470 };
 471
 472 static inline void __init ic_rarp_init(void)
 473 {
 474         dev_add_pack(&rarp_packet_type);
 475 }
 476
 477 static inline void __init ic_rarp_cleanup(void)
 478 {
 479         dev_remove_pack(&rarp_packet_type);
 480 }
 481
 482 /*
 483  *  Process received RARP packet.
 484  */
 485 static int __init
 486 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 487 {
 488         struct arphdr *rarp;
 489         unsigned char *rarp_ptr;
 490         __be32 sip, tip;
 491         unsigned char *sha, *tha;               /* s for "source", t for "target" */
 492         struct ic_device *d;
 493
 494         if (!net_eq(dev_net(dev), &init_net))
 495                 goto drop;
 496
 497         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 498                 return NET_RX_DROP;
 499
 500         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
 501                 goto drop;
 502
 503         /* Basic sanity checks can be done without the lock.  */
 504         rarp = (struct arphdr *)skb_transport_header(skb);
 505
 506         /* If this test doesn't pass, it's not IP, or we should
 507          * ignore it anyway.
 508          */
 509         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
 510                 goto drop;
 511
 512         /* If it's not a RARP reply, delete it. */
 513         if (rarp->ar_op != htons(ARPOP_RREPLY))
 514                 goto drop;
 515
 516         /* If it's not Ethernet, delete it. */
 517         if (rarp->ar_pro != htons(ETH_P_IP))
 518                 goto drop;
 519
 520         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
 521                 goto drop;
 522
 523         /* OK, it is all there and looks valid, process... */
 524         rarp = (struct arphdr *)skb_transport_header(skb);
 525         rarp_ptr = (unsigned char *) (rarp + 1);
 526
 527         /* One reply at a time, please. */
 528         spin_lock(&ic_recv_lock);
 529
 530         /* If we already have a reply, just drop the packet */
 531         if (ic_got_reply)
 532                 goto drop_unlock;
 533
 534         /* Find the ic_device that the packet arrived on */
 535         d = ic_first_dev;
 536         while (d && d->dev != dev)
 537                 d = d->next;
 538         if (!d)
 539                 goto drop_unlock;       /* should never happen */
 540
 541         /* Extract variable-width fields */
 542         sha = rarp_ptr;
 543         rarp_ptr += dev->addr_len;
 544         memcpy(&sip, rarp_ptr, 4);
 545         rarp_ptr += 4;
 546         tha = rarp_ptr;
 547         rarp_ptr += dev->addr_len;
 548         memcpy(&tip, rarp_ptr, 4);
 549
 550         /* Discard packets which are not meant for us. */
 551         if (memcmp(tha, dev->dev_addr, dev->addr_len))
 552                 goto drop_unlock;
 553
 554         /* Discard packets which are not from specified server. */
 555         if (ic_servaddr != NONE && ic_servaddr != sip)
 556                 goto drop_unlock;
 557
 558         /* We have a winner! */
 559         ic_dev = dev;
 560         if (ic_myaddr == NONE)
 561                 ic_myaddr = tip;
 562         ic_servaddr = sip;
 563         ic_addrservaddr = sip;
 564         ic_got_reply = IC_RARP;
 565
 566 drop_unlock:
 567         /* Show's over.  Nothing to see here.  */
 568         spin_unlock(&ic_recv_lock);
 569
 570 drop:
 571         /* Throw the packet out. */
 572         kfree_skb(skb);
 573         return 0;
 574 }
 575
 576
 577 /*
 578  *  Send RARP request packet over a single interface.
 579  */
 580 static void __init ic_rarp_send_if(struct ic_device *d)
 581 {
 582         struct net_device *dev = d->dev;
 583         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
 584                  dev->dev_addr, dev->dev_addr);
 585 }
 586 #endif
 587
 588 /*
 589  *  Predefine Nameservers
 590  */
 591 static inline void __init ic_nameservers_predef(void)
 592 {
 593         int i;
 594
 595         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
 596                 ic_nameservers[i] = NONE;
 597 }
 598
 599 /*
 600  *      DHCP/BOOTP support.
 601  */
 602
 603 #ifdef IPCONFIG_BOOTP
 604
 605 struct bootp_pkt {              /* BOOTP packet format */
 606         struct iphdr iph;       /* IP header */
 607         struct udphdr udph;     /* UDP header */
 608         u8 op;                  /* 1=request, 2=reply */
 609         u8 htype;               /* HW address type */
 610         u8 hlen;                /* HW address length */
 611         u8 hops;                /* Used only by gateways */
 612         __be32 xid;             /* Transaction ID */
 613         __be16 secs;            /* Seconds since we started */
 614         __be16 flags;           /* Just what it says */
 615         __be32 client_ip;               /* Client's IP address if known */
 616         __be32 your_ip;         /* Assigned IP address */
 617         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
 618         __be32 relay_ip;                /* IP address of BOOTP relay */
 619         u8 hw_addr[16];         /* Client's HW address */
 620         u8 serv_name[64];       /* Server host name */
 621         u8 boot_file[128];      /* Name of boot file */
 622         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
 623 };
 624
 625 /* packet ops */
 626 #define BOOTP_REQUEST   1
 627 #define BOOTP_REPLY     2
 628
 629 /* DHCP message types */
 630 #define DHCPDISCOVER    1
 631 #define DHCPOFFER       2
 632 #define DHCPREQUEST     3
 633 #define DHCPDECLINE     4
 634 #define DHCPACK         5
 635 #define DHCPNAK         6
 636 #define DHCPRELEASE     7
 637 #define DHCPINFORM      8
 638
 639 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 640
 641 static struct packet_type bootp_packet_type __initdata = {
 642         .type = cpu_to_be16(ETH_P_IP),
 643         .func = ic_bootp_recv,
 644 };
 645
 646
 647 /*
 648  *  Initialize DHCP/BOOTP extension fields in the request.
 649  */
 650
 651 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
 652
 653 #ifdef IPCONFIG_DHCP
 654
 655 static void __init
 656 ic_dhcp_init_options(u8 *options)
 657 {
 658         u8 mt = ((ic_servaddr == NONE)
 659                  ? DHCPDISCOVER : DHCPREQUEST);
 660         u8 *e = options;
 661         int len;
 662
 663 #ifdef IPCONFIG_DEBUG
 664         printk("DHCP: Sending message type %d\n", mt);
 665 #endif
 666
 667         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 668         e += 4;
 669
 670         *e++ = 53;              /* DHCP message type */
 671         *e++ = 1;
 672         *e++ = mt;
 673
 674         if (mt == DHCPREQUEST) {
 675                 *e++ = 54;      /* Server ID (IP address) */
 676                 *e++ = 4;
 677                 memcpy(e, &ic_servaddr, 4);
 678                 e += 4;
 679
 680                 *e++ = 50;      /* Requested IP address */
 681                 *e++ = 4;
 682                 memcpy(e, &ic_myaddr, 4);
 683                 e += 4;
 684         }
 685
 686         /* always? */
 687         {
 688                 static const u8 ic_req_params[] = {
 689                         1,      /* Subnet mask */
 690                         3,      /* Default gateway */
 691                         6,      /* DNS server */
 692                         12,     /* Host name */
 693                         15,     /* Domain name */
 694                         17,     /* Boot path */
 695                         26,     /* MTU */
 696                         40,     /* NIS domain name */
 697                 };
 698
 699                 *e++ = 55;      /* Parameter request list */
 700                 *e++ = sizeof(ic_req_params);
 701                 memcpy(e, ic_req_params, sizeof(ic_req_params));
 702                 e += sizeof(ic_req_params);
 703
 704                 if (ic_host_name_set) {
 705                         *e++ = 12;      /* host-name */
 706                         len = strlen(utsname()->nodename);
 707                         *e++ = len;
 708                         memcpy(e, utsname()->nodename, len);
 709                         e += len;
 710                 }
 711                 if (*vendor_class_identifier) {
 712                         pr_info("DHCP: sending class identifier \"%s\"\n",
 713                                 vendor_class_identifier);
 714                         *e++ = 60;      /* Class-identifier */
 715                         len = strlen(vendor_class_identifier);
 716                         *e++ = len;
 717                         memcpy(e, vendor_class_identifier, len);
 718                         e += len;
 719                 }
 720         }
 721
 722         *e++ = 255;     /* End of the list */
 723 }
 724
 725 #endif /* IPCONFIG_DHCP */
 726
 727 static void __init ic_bootp_init_ext(u8 *e)
 728 {
 729         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 730         e += 4;
 731         *e++ = 1;               /* Subnet mask request */
 732         *e++ = 4;
 733         e += 4;
 734         *e++ = 3;               /* Default gateway request */
 735         *e++ = 4;
 736         e += 4;
 737         *e++ = 5;               /* Name server request */
 738         *e++ = 8;
 739         e += 8;
 740         *e++ = 12;              /* Host name request */
 741         *e++ = 32;
 742         e += 32;
 743         *e++ = 40;              /* NIS Domain name request */
 744         *e++ = 32;
 745         e += 32;
 746         *e++ = 17;              /* Boot path */
 747         *e++ = 40;
 748         e += 40;
 749
 750         *e++ = 57;              /* set extension buffer size for reply */
 751         *e++ = 2;
 752         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
 753         *e++ = 150;
 754
 755         *e++ = 255;             /* End of the list */
 756 }
 757
 758
 759 /*
 760  *  Initialize the DHCP/BOOTP mechanism.
 761  */
 762 static inline void __init ic_bootp_init(void)
 763 {
 764         ic_nameservers_predef();
 765
 766         dev_add_pack(&bootp_packet_type);
 767 }
 768
 769
 770 /*
 771  *  DHCP/BOOTP cleanup.
 772  */
 773 static inline void __init ic_bootp_cleanup(void)
 774 {
 775         dev_remove_pack(&bootp_packet_type);
 776 }
 777
 778
 779 /*
 780  *  Send DHCP/BOOTP request to single interface.
 781  */
 782 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
 783 {
 784         struct net_device *dev = d->dev;
 785         struct sk_buff *skb;
 786         struct bootp_pkt *b;
 787         struct iphdr *h;
 788         int hlen = LL_RESERVED_SPACE(dev);
 789         int tlen = dev->needed_tailroom;
 790
 791         /* Allocate packet */
 792         skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
 793                         GFP_KERNEL);
 794         if (!skb)
 795                 return;
 796         skb_reserve(skb, hlen);
 797         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
 798         memset(b, 0, sizeof(struct bootp_pkt));
 799
 800         /* Construct IP header */
 801         skb_reset_network_header(skb);
 802         h = ip_hdr(skb);
 803         h->version = 4;
 804         h->ihl = 5;
 805         h->tot_len = htons(sizeof(struct bootp_pkt));
 806         h->frag_off = htons(IP_DF);
 807         h->ttl = 64;
 808         h->protocol = IPPROTO_UDP;
 809         h->daddr = htonl(INADDR_BROADCAST);
 810         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
 811
 812         /* Construct UDP header */
 813         b->udph.source = htons(68);
 814         b->udph.dest = htons(67);
 815         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
 816         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
 817
 818         /* Construct DHCP/BOOTP header */
 819         b->op = BOOTP_REQUEST;
 820         if (dev->type < 256) /* check for false types */
 821                 b->htype = dev->type;
 822         else if (dev->type == ARPHRD_FDDI)
 823                 b->htype = ARPHRD_ETHER;
 824         else {
 825                 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
 826                 b->htype = dev->type; /* can cause undefined behavior */
 827         }
 828
 829         /* server_ip and your_ip address are both already zero per RFC2131 */
 830         b->hlen = dev->addr_len;
 831         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
 832         b->secs = htons(jiffies_diff / HZ);
 833         b->xid = d->xid;
 834
 835         /* add DHCP options or BOOTP extensions */
 836 #ifdef IPCONFIG_DHCP
 837         if (ic_proto_enabled & IC_USE_DHCP)
 838                 ic_dhcp_init_options(b->exten);
 839         else
 840 #endif
 841                 ic_bootp_init_ext(b->exten);
 842
 843         /* Chain packet down the line... */
 844         skb->dev = dev;
 845         skb->protocol = htons(ETH_P_IP);
 846         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
 847                             dev->broadcast, dev->dev_addr, skb->len) < 0) {
 848                 kfree_skb(skb);
 849                 printk("E");
 850                 return;
 851         }
 852
 853         if (dev_queue_xmit(skb) < 0)
 854                 printk("E");
 855 }
 856
 857
 858 /*
 859  *  Copy BOOTP-supplied string if not already set.
 860  */
 861 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
 862 {
 863         if (!len)
 864                 return 0;
 865         if (len > max-1)
 866                 len = max-1;
 867         memcpy(dest, src, len);
 868         dest[len] = '\0';
 869         return 1;
 870 }
 871
 872
 873 /*
 874  *  Process BOOTP extensions.
 875  */
 876 static void __init ic_do_bootp_ext(u8 *ext)
 877 {
 878         u8 servers;
 879         int i;
 880         __be16 mtu;
 881
 882 #ifdef IPCONFIG_DEBUG
 883         u8 *c;
 884
 885         printk("DHCP/BOOTP: Got extension %d:",*ext);
 886         for (c=ext+2; c<ext+2+ext[1]; c++)
 887                 printk(" %02x", *c);
 888         printk("\n");
 889 #endif
 890
 891         switch (*ext++) {
 892         case 1:         /* Subnet mask */
 893                 if (ic_netmask == NONE)
 894                         memcpy(&ic_netmask, ext+1, 4);
 895                 break;
 896         case 3:         /* Default gateway */
 897                 if (ic_gateway == NONE)
 898                         memcpy(&ic_gateway, ext+1, 4);
 899                 break;
 900         case 6:         /* DNS server */
 901                 servers= *ext/4;
 902                 if (servers > CONF_NAMESERVERS_MAX)
 903                         servers = CONF_NAMESERVERS_MAX;
 904                 for (i = 0; i < servers; i++) {
 905                         if (ic_nameservers[i] == NONE)
 906                                 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
 907                 }
 908                 break;
 909         case 12:        /* Host name */
 910                 ic_bootp_string(utsname()->nodename, ext+1, *ext,
 911                                 __NEW_UTS_LEN);
 912                 ic_host_name_set = 1;
 913                 break;
 914         case 15:        /* Domain name (DNS) */
 915                 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
 916                 break;
 917         case 17:        /* Root path */
 918                 if (!root_server_path[0])
 919                         ic_bootp_string(root_server_path, ext+1, *ext,
 920                                         sizeof(root_server_path));
 921                 break;
 922         case 26:        /* Interface MTU */
 923                 memcpy(&mtu, ext+1, sizeof(mtu));
 924                 ic_dev_mtu = ntohs(mtu);
 925                 break;
 926         case 40:        /* NIS Domain name (_not_ DNS) */
 927                 ic_bootp_string(utsname()->domainname, ext+1, *ext,
 928                                 __NEW_UTS_LEN);
 929                 break;
 930         }
 931 }
 932
 933
 934 /*
 935  *  Receive BOOTP reply.
 936  */
 937 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 938 {
 939         struct bootp_pkt *b;
 940         struct iphdr *h;
 941         struct ic_device *d;
 942         int len, ext_len;
 943
 944         if (!net_eq(dev_net(dev), &init_net))
 945                 goto drop;
 946
 947         /* Perform verifications before taking the lock.  */
 948         if (skb->pkt_type == PACKET_OTHERHOST)
 949                 goto drop;
 950
 951         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 952                 return NET_RX_DROP;
 953
 954         if (!pskb_may_pull(skb,
 955                            sizeof(struct iphdr) +
 956                            sizeof(struct udphdr)))
 957                 goto drop;
 958
 959         b = (struct bootp_pkt *)skb_network_header(skb);
 960         h = &b->iph;
 961
 962         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
 963                 goto drop;
 964
 965         /* Fragments are not supported */
 966         if (ip_is_fragment(h)) {
 967                 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
 968                 goto drop;
 969         }
 970
 971         if (skb->len < ntohs(h->tot_len))
 972                 goto drop;
 973
 974         if (ip_fast_csum((char *) h, h->ihl))
 975                 goto drop;
 976
 977         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
 978                 goto drop;
 979
 980         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
 981                 goto drop;
 982
 983         len = ntohs(b->udph.len) - sizeof(struct udphdr);
 984         ext_len = len - (sizeof(*b) -
 985                          sizeof(struct iphdr) -
 986                          sizeof(struct udphdr) -
 987                          sizeof(b->exten));
 988         if (ext_len < 0)
 989                 goto drop;
 990
 991         /* Ok the front looks good, make sure we can get at the rest.  */
 992         if (!pskb_may_pull(skb, skb->len))
 993                 goto drop;
 994
 995         b = (struct bootp_pkt *)skb_network_header(skb);
 996         h = &b->iph;
 997
 998         /* One reply at a time, please. */
 999         spin_lock(&ic_recv_lock);
1000
1001         /* If we already have a reply, just drop the packet */
1002         if (ic_got_reply)
1003                 goto drop_unlock;
1004
1005         /* Find the ic_device that the packet arrived on */
1006         d = ic_first_dev;
1007         while (d && d->dev != dev)
1008                 d = d->next;
1009         if (!d)
1010                 goto drop_unlock;  /* should never happen */
1011
1012         /* Is it a reply to our BOOTP request? */
1013         if (b->op != BOOTP_REPLY ||
1014             b->xid != d->xid) {
1015                 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1016                                     b->op, b->xid);
1017                 goto drop_unlock;
1018         }
1019
1020         /* Is it a reply for the device we are configuring? */
1021         if (b->xid != ic_dev_xid) {
1022                 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1023                 goto drop_unlock;
1024         }
1025
1026         /* Parse extensions */
1027         if (ext_len >= 4 &&
1028             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1029                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1030                 u8 *ext;
1031
1032 #ifdef IPCONFIG_DHCP
1033                 if (ic_proto_enabled & IC_USE_DHCP) {
1034                         __be32 server_id = NONE;
1035                         int mt = 0;
1036
1037                         ext = &b->exten[4];
1038                         while (ext < end && *ext != 0xff) {
1039                                 u8 *opt = ext++;
1040                                 if (*opt == 0)  /* Padding */
1041                                         continue;
1042                                 ext += *ext + 1;
1043                                 if (ext >= end)
1044                                         break;
1045                                 switch (*opt) {
1046                                 case 53:        /* Message type */
1047                                         if (opt[1])
1048                                                 mt = opt[2];
1049                                         break;
1050                                 case 54:        /* Server ID (IP address) */
1051                                         if (opt[1] >= 4)
1052                                                 memcpy(&server_id, opt + 2, 4);
1053                                         break;
1054                                 }
1055                         }
1056
1057 #ifdef IPCONFIG_DEBUG
1058                         printk("DHCP: Got message type %d\n", mt);
1059 #endif
1060
1061                         switch (mt) {
1062                         case DHCPOFFER:
1063                                 /* While in the process of accepting one offer,
1064                                  * ignore all others.
1065                                  */
1066                                 if (ic_myaddr != NONE)
1067                                         goto drop_unlock;
1068
1069                                 /* Let's accept that offer. */
1070                                 ic_myaddr = b->your_ip;
1071                                 ic_servaddr = server_id;
1072 #ifdef IPCONFIG_DEBUG
1073                                 printk("DHCP: Offered address %pI4 by server %pI4\n",
1074                                        &ic_myaddr, &b->iph.saddr);
1075 #endif
1076                                 /* The DHCP indicated server address takes
1077                                  * precedence over the bootp header one if
1078                                  * they are different.
1079                                  */
1080                                 if ((server_id != NONE) &&
1081                                     (b->server_ip != server_id))
1082                                         b->server_ip = ic_servaddr;
1083                                 break;
1084
1085                         case DHCPACK:
1086                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1087                                         goto drop_unlock;
1088
1089                                 /* Yeah! */
1090                                 break;
1091
1092                         default:
1093                                 /* Urque.  Forget it*/
1094                                 ic_myaddr = NONE;
1095                                 ic_servaddr = NONE;
1096                                 goto drop_unlock;
1097                         }
1098
1099                         ic_dhcp_msgtype = mt;
1100
1101                 }
1102 #endif /* IPCONFIG_DHCP */
1103
1104                 ext = &b->exten[4];
1105                 while (ext < end && *ext != 0xff) {
1106                         u8 *opt = ext++;
1107                         if (*opt == 0)  /* Padding */
1108                                 continue;
1109                         ext += *ext + 1;
1110                         if (ext < end)
1111                                 ic_do_bootp_ext(opt);
1112                 }
1113         }
1114
1115         /* We have a winner! */
1116         ic_dev = dev;
1117         ic_myaddr = b->your_ip;
1118         ic_servaddr = b->server_ip;
1119         ic_addrservaddr = b->iph.saddr;
1120         if (ic_gateway == NONE && b->relay_ip)
1121                 ic_gateway = b->relay_ip;
1122         if (ic_nameservers[0] == NONE)
1123                 ic_nameservers[0] = ic_servaddr;
1124         ic_got_reply = IC_BOOTP;
1125
1126 drop_unlock:
1127         /* Show's over.  Nothing to see here.  */
1128         spin_unlock(&ic_recv_lock);
1129
1130 drop:
1131         /* Throw the packet out. */
1132         kfree_skb(skb);
1133
1134         return 0;
1135 }
1136
1137
1138 #endif
1139
1140
1141 /*
1142  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1143  */
1144
1145 #ifdef IPCONFIG_DYNAMIC
1146
1147 static int __init ic_dynamic(void)
1148 {
1149         int retries;
1150         struct ic_device *d;
1151         unsigned long start_jiffies, timeout, jiff;
1152         int do_bootp = ic_proto_have_if & IC_BOOTP;
1153         int do_rarp = ic_proto_have_if & IC_RARP;
1154
1155         /*
1156          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1157          * This routine gets only called when some pieces of information
1158          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1159          */
1160         if (!ic_proto_enabled) {
1161                 pr_err("IP-Config: Incomplete network configuration information\n");
1162                 return -1;
1163         }
1164
1165 #ifdef IPCONFIG_BOOTP
1166         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1167                 pr_err("DHCP/BOOTP: No suitable device found\n");
1168 #endif
1169 #ifdef IPCONFIG_RARP
1170         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1171                 pr_err("RARP: No suitable device found\n");
1172 #endif
1173
1174         if (!ic_proto_have_if)
1175                 /* Error message already printed */
1176                 return -1;
1177
1178         /*
1179          * Setup protocols
1180          */
1181 #ifdef IPCONFIG_BOOTP
1182         if (do_bootp)
1183                 ic_bootp_init();
1184 #endif
1185 #ifdef IPCONFIG_RARP
1186         if (do_rarp)
1187                 ic_rarp_init();
1188 #endif
1189
1190         /*
1191          * Send requests and wait, until we get an answer. This loop
1192          * seems to be a terrible waste of CPU time, but actually there is
1193          * only one process running at all, so we don't need to use any
1194          * scheduler functions.
1195          * [Actually we could now, but the nothing else running note still
1196          *  applies.. - AC]
1197          */
1198         pr_notice("Sending %s%s%s requests .",
1199                   do_bootp
1200                   ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1201                   (do_bootp && do_rarp) ? " and " : "",
1202                   do_rarp ? "RARP" : "");
1203
1204         start_jiffies = jiffies;
1205         d = ic_first_dev;
1206         retries = CONF_SEND_RETRIES;
1207         get_random_bytes(&timeout, sizeof(timeout));
1208         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1209         for (;;) {
1210                 /* Track the device we are configuring */
1211                 ic_dev_xid = d->xid;
1212
1213 #ifdef IPCONFIG_BOOTP
1214                 if (do_bootp && (d->able & IC_BOOTP))
1215                         ic_bootp_send_if(d, jiffies - start_jiffies);
1216 #endif
1217 #ifdef IPCONFIG_RARP
1218                 if (do_rarp && (d->able & IC_RARP))
1219                         ic_rarp_send_if(d);
1220 #endif
1221
1222                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1223                 while (time_before(jiffies, jiff) && !ic_got_reply)
1224                         schedule_timeout_uninterruptible(1);
1225 #ifdef IPCONFIG_DHCP
1226                 /* DHCP isn't done until we get a DHCPACK. */
1227                 if ((ic_got_reply & IC_BOOTP) &&
1228                     (ic_proto_enabled & IC_USE_DHCP) &&
1229                     ic_dhcp_msgtype != DHCPACK) {
1230                         ic_got_reply = 0;
1231                         pr_cont(",");
1232                         continue;
1233                 }
1234 #endif /* IPCONFIG_DHCP */
1235
1236                 if (ic_got_reply) {
1237                         pr_cont(" OK\n");
1238                         break;
1239                 }
1240
1241                 if ((d = d->next))
1242                         continue;
1243
1244                 if (! --retries) {
1245                         pr_cont(" timed out!\n");
1246                         break;
1247                 }
1248
1249                 d = ic_first_dev;
1250
1251                 timeout = timeout CONF_TIMEOUT_MULT;
1252                 if (timeout > CONF_TIMEOUT_MAX)
1253                         timeout = CONF_TIMEOUT_MAX;
1254
1255                 pr_cont(".");
1256         }
1257
1258 #ifdef IPCONFIG_BOOTP
1259         if (do_bootp)
1260                 ic_bootp_cleanup();
1261 #endif
1262 #ifdef IPCONFIG_RARP
1263         if (do_rarp)
1264                 ic_rarp_cleanup();
1265 #endif
1266
1267         if (!ic_got_reply) {
1268                 ic_myaddr = NONE;
1269                 return -1;
1270         }
1271
1272         printk("IP-Config: Got %s answer from %pI4, ",
1273                 ((ic_got_reply & IC_RARP) ? "RARP"
1274                  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1275                &ic_addrservaddr);
1276         pr_cont("my address is %pI4\n", &ic_myaddr);
1277
1278         return 0;
1279 }
1280
1281 #endif /* IPCONFIG_DYNAMIC */
1282
1283 #ifdef CONFIG_PROC_FS
1284
1285 static int pnp_seq_show(struct seq_file *seq, void *v)
1286 {
1287         int i;
1288
1289         if (ic_proto_used & IC_PROTO)
1290                 seq_printf(seq, "#PROTO: %s\n",
1291                            (ic_proto_used & IC_RARP) ? "RARP"
1292                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1293         else
1294                 seq_puts(seq, "#MANUAL\n");
1295
1296         if (ic_domain[0])
1297                 seq_printf(seq,
1298                            "domain %s\n", ic_domain);
1299         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1300                 if (ic_nameservers[i] != NONE)
1301                         seq_printf(seq, "nameserver %pI4\n",
1302                                    &ic_nameservers[i]);
1303         }
1304         if (ic_servaddr != NONE)
1305                 seq_printf(seq, "bootserver %pI4\n",
1306                            &ic_servaddr);
1307         return 0;
1308 }
1309
1310 static int pnp_seq_open(struct inode *indoe, struct file *file)
1311 {
1312         return single_open(file, pnp_seq_show, NULL);
1313 }
1314
1315 static const struct file_operations pnp_seq_fops = {
1316         .owner          = THIS_MODULE,
1317         .open           = pnp_seq_open,
1318         .read           = seq_read,
1319         .llseek         = seq_lseek,
1320         .release        = single_release,
1321 };
1322 #endif /* CONFIG_PROC_FS */
1323
1324 /*
1325  *  Extract IP address from the parameter string if needed. Note that we
1326  *  need to have root_server_addr set _before_ IPConfig gets called as it
1327  *  can override it.
1328  */
1329 __be32 __init root_nfs_parse_addr(char *name)
1330 {
1331         __be32 addr;
1332         int octets = 0;
1333         char *cp, *cq;
1334
1335         cp = cq = name;
1336         while (octets < 4) {
1337                 while (*cp >= '0' && *cp <= '9')
1338                         cp++;
1339                 if (cp == cq || cp - cq > 3)
1340                         break;
1341                 if (*cp == '.' || octets == 3)
1342                         octets++;
1343                 if (octets < 4)
1344                         cp++;
1345                 cq = cp;
1346         }
1347         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1348                 if (*cp == ':')
1349                         *cp++ = '\0';
1350                 addr = in_aton(name);
1351                 memmove(name, cp, strlen(cp) + 1);
1352         } else
1353                 addr = NONE;
1354
1355         return addr;
1356 }
1357
1358 #define DEVICE_WAIT_MAX         12 /* 12 seconds */
1359
1360 static int __init wait_for_devices(void)
1361 {
1362         int i;
1363
1364         for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1365                 struct net_device *dev;
1366                 int found = 0;
1367
1368                 rtnl_lock();
1369                 for_each_netdev(&init_net, dev) {
1370                         if (ic_is_init_dev(dev)) {
1371                                 found = 1;
1372                                 break;
1373                         }
1374                 }
1375                 rtnl_unlock();
1376                 if (found)
1377                         return 0;
1378                 ssleep(1);
1379         }
1380         return -ENODEV;
1381 }
1382
1383 /*
1384  *      IP Autoconfig dispatcher.
1385  */
1386
1387 static int __init ip_auto_config(void)
1388 {
1389         __be32 addr;
1390 #ifdef IPCONFIG_DYNAMIC
1391         int retries = CONF_OPEN_RETRIES;
1392 #endif
1393         int err;
1394         unsigned int i;
1395
1396 #ifdef CONFIG_PROC_FS
1397         proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1398 #endif /* CONFIG_PROC_FS */
1399
1400         if (!ic_enable)
1401                 return 0;
1402
1403         DBG(("IP-Config: Entered.\n"));
1404 #ifdef IPCONFIG_DYNAMIC
1405  try_try_again:
1406 #endif
1407         /* Wait for devices to appear */
1408         err = wait_for_devices();
1409         if (err)
1410                 return err;
1411
1412         /* Setup all network devices */
1413         err = ic_open_devs();
1414         if (err)
1415                 return err;
1416
1417         /* Give drivers a chance to settle */
1418         msleep(CONF_POST_OPEN);
1419
1420         /*
1421          * If the config information is insufficient (e.g., our IP address or
1422          * IP address of the boot server is missing or we have multiple network
1423          * interfaces and no default was set), use BOOTP or RARP to get the
1424          * missing values.
1425          */
1426         if (ic_myaddr == NONE ||
1427 #ifdef CONFIG_ROOT_NFS
1428             (root_server_addr == NONE &&
1429              ic_servaddr == NONE &&
1430              ROOT_DEV == Root_NFS) ||
1431 #endif
1432             ic_first_dev->next) {
1433 #ifdef IPCONFIG_DYNAMIC
1434                 if (ic_dynamic() < 0) {
1435                         ic_close_devs();
1436
1437                         /*
1438                          * I don't know why, but sometimes the
1439                          * eepro100 driver (at least) gets upset and
1440                          * doesn't work the first time it's opened.
1441                          * But then if you close it and reopen it, it
1442                          * works just fine.  So we need to try that at
1443                          * least once before giving up.
1444                          *
1445                          * Also, if the root will be NFS-mounted, we
1446                          * have nowhere to go if DHCP fails.  So we
1447                          * just have to keep trying forever.
1448                          *
1449                          *                              -- Chip
1450                          */
1451 #ifdef CONFIG_ROOT_NFS
1452                         if (ROOT_DEV ==  Root_NFS) {
1453                                 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1454                                 goto try_try_again;
1455                         }
1456 #endif
1457
1458                         if (--retries) {
1459                                 pr_err("IP-Config: Reopening network devices...\n");
1460                                 goto try_try_again;
1461                         }
1462
1463                         /* Oh, well.  At least we tried. */
1464                         pr_err("IP-Config: Auto-configuration of network failed\n");
1465                         return -1;
1466                 }
1467 #else /* !DYNAMIC */
1468                 pr_err("IP-Config: Incomplete network configuration information\n");
1469                 ic_close_devs();
1470                 return -1;
1471 #endif /* IPCONFIG_DYNAMIC */
1472         } else {
1473                 /* Device selected manually or only one device -> use it */
1474                 ic_dev = ic_first_dev->dev;
1475         }
1476
1477         addr = root_nfs_parse_addr(root_server_path);
1478         if (root_server_addr == NONE)
1479                 root_server_addr = addr;
1480
1481         /*
1482          * Use defaults wherever applicable.
1483          */
1484         if (ic_defaults() < 0)
1485                 return -1;
1486
1487         /*
1488          * Close all network devices except the device we've
1489          * autoconfigured and set up routes.
1490          */
1491         ic_close_devs();
1492         if (ic_setup_if() < 0 || ic_setup_routes() < 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->name, ic_dev->addr_len, ic_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_info("     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\n", i, &ic_nameservers[i]);
1526 #endif /* !SILENT */
1527
1528         return 0;
1529 }
1530
1531 late_initcall(ip_auto_config);
1532
1533
1534 /*
1535  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1536  *  command line parameter.  See Documentation/filesystems/nfs/nfsroot.txt.
1537  */
1538 static int __init ic_proto_name(char *name)
1539 {
1540         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1541                 return 1;
1542         }
1543         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1544                 return 0;
1545         }
1546 #ifdef CONFIG_IP_PNP_DHCP
1547         else if (!strcmp(name, "dhcp")) {
1548                 ic_proto_enabled &= ~IC_RARP;
1549                 return 1;
1550         }
1551 #endif
1552 #ifdef CONFIG_IP_PNP_BOOTP
1553         else if (!strcmp(name, "bootp")) {
1554                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1555                 return 1;
1556         }
1557 #endif
1558 #ifdef CONFIG_IP_PNP_RARP
1559         else if (!strcmp(name, "rarp")) {
1560                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1561                 return 1;
1562         }
1563 #endif
1564 #ifdef IPCONFIG_DYNAMIC
1565         else if (!strcmp(name, "both")) {
1566                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1567                 return 1;
1568         }
1569 #endif
1570         return 0;
1571 }
1572
1573 static int __init ip_auto_config_setup(char *addrs)
1574 {
1575         char *cp, *ip, *dp;
1576         int num = 0;
1577
1578         ic_set_manually = 1;
1579         ic_enable = 1;
1580
1581         /*
1582          * If any dhcp, bootp etc options are set, leave autoconfig on
1583          * and skip the below static IP processing.
1584          */
1585         if (ic_proto_name(addrs))
1586                 return 1;
1587
1588         /* If no static IP is given, turn off autoconfig and bail.  */
1589         if (*addrs == 0 ||
1590             strcmp(addrs, "off") == 0 ||
1591             strcmp(addrs, "none") == 0) {
1592                 ic_enable = 0;
1593                 return 1;
1594         }
1595
1596         ic_nameservers_predef();
1597
1598         /* Parse string for static IP assignment.  */
1599         ip = addrs;
1600         while (ip && *ip) {
1601                 if ((cp = strchr(ip, ':')))
1602                         *cp++ = '\0';
1603                 if (strlen(ip) > 0) {
1604                         DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1605                         switch (num) {
1606                         case 0:
1607                                 if ((ic_myaddr = in_aton(ip)) == ANY)
1608                                         ic_myaddr = NONE;
1609                                 break;
1610                         case 1:
1611                                 if ((ic_servaddr = in_aton(ip)) == ANY)
1612                                         ic_servaddr = NONE;
1613                                 break;
1614                         case 2:
1615                                 if ((ic_gateway = in_aton(ip)) == ANY)
1616                                         ic_gateway = NONE;
1617                                 break;
1618                         case 3:
1619                                 if ((ic_netmask = in_aton(ip)) == ANY)
1620                                         ic_netmask = NONE;
1621                                 break;
1622                         case 4:
1623                                 if ((dp = strchr(ip, '.'))) {
1624                                         *dp++ = '\0';
1625                                         strlcpy(utsname()->domainname, dp,
1626                                                 sizeof(utsname()->domainname));
1627                                 }
1628                                 strlcpy(utsname()->nodename, ip,
1629                                         sizeof(utsname()->nodename));
1630                                 ic_host_name_set = 1;
1631                                 break;
1632                         case 5:
1633                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1634                                 break;
1635                         case 6:
1636                                 if (ic_proto_name(ip) == 0 &&
1637                                     ic_myaddr == NONE) {
1638                                         ic_enable = 0;
1639                                 }
1640                                 break;
1641                         case 7:
1642                                 if (CONF_NAMESERVERS_MAX >= 1) {
1643                                         ic_nameservers[0] = in_aton(ip);
1644                                         if (ic_nameservers[0] == ANY)
1645                                                 ic_nameservers[0] = NONE;
1646                                 }
1647                                 break;
1648                         case 8:
1649                                 if (CONF_NAMESERVERS_MAX >= 2) {
1650                                         ic_nameservers[1] = in_aton(ip);
1651                                         if (ic_nameservers[1] == ANY)
1652                                                 ic_nameservers[1] = NONE;
1653                                 }
1654                                 break;
1655                         }
1656                 }
1657                 ip = cp;
1658                 num++;
1659         }
1660
1661         return 1;
1662 }
1663 __setup("ip=", ip_auto_config_setup);
1664
1665 static int __init nfsaddrs_config_setup(char *addrs)
1666 {
1667         return ip_auto_config_setup(addrs);
1668 }
1669 __setup("nfsaddrs=", nfsaddrs_config_setup);
1670
1671 static int __init vendor_class_identifier_setup(char *addrs)
1672 {
1673         if (strlcpy(vendor_class_identifier, addrs,
1674                     sizeof(vendor_class_identifier))
1675             >= sizeof(vendor_class_identifier))
1676                 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"",
1677                         vendor_class_identifier);
1678         return 1;
1679 }
1680 __setup("dhcpclass=", vendor_class_identifier_setup);