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_INTER_TIMEOUT      (HZ)    /* Inter-device timeout: 1 second */
  89 #define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
  90 #define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
  91 #define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
  92 #define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
  93 #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
  94                                            - '3' from resolv.h */
  95
  96 #define NONE cpu_to_be32(INADDR_NONE)
  97 #define ANY cpu_to_be32(INADDR_ANY)
  98
  99 /*
 100  * Public IP configuration
 101  */
 102
 103 /* This is used by platforms which might be able to set the ipconfig
 104  * variables using firmware environment vars.  If this is set, it will
 105  * ignore such firmware variables.
 106  */
 107 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
 108
 109 static int ic_enable __initdata;                /* IP config enabled? */
 110
 111 /* Protocol choice */
 112 int ic_proto_enabled __initdata = 0
 113 #ifdef IPCONFIG_BOOTP
 114                         | IC_BOOTP
 115 #endif
 116 #ifdef CONFIG_IP_PNP_DHCP
 117                         | IC_USE_DHCP
 118 #endif
 119 #ifdef IPCONFIG_RARP
 120                         | IC_RARP
 121 #endif
 122                         ;
 123
 124 static int ic_host_name_set __initdata; /* Host name set by us? */
 125
 126 __be32 ic_myaddr = NONE;                /* My IP address */
 127 static __be32 ic_netmask = NONE;        /* Netmask for local subnet */
 128 __be32 ic_gateway = NONE;       /* Gateway IP address */
 129
 130 #ifdef IPCONFIG_DYNAMIC
 131 static __be32 ic_addrservaddr = NONE;   /* IP Address of the IP addresses'server */
 132 #endif
 133
 134 __be32 ic_servaddr = NONE;      /* Boot server IP address */
 135
 136 __be32 root_server_addr = NONE; /* Address of NFS server */
 137 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
 138
 139 /* vendor class identifier */
 140 static char vendor_class_identifier[253] __initdata;
 141
 142 #if defined(CONFIG_IP_PNP_DHCP)
 143 static char dhcp_client_identifier[253] __initdata;
 144 #endif
 145
 146 /* Persistent data: */
 147
 148 #ifdef IPCONFIG_DYNAMIC
 149 static int ic_proto_used;                       /* Protocol used, if any */
 150 #else
 151 #define ic_proto_used 0
 152 #endif
 153 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
 154 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
 155
 156 /*
 157  * Private state.
 158  */
 159
 160 /* Name of user-selected boot device */
 161 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
 162
 163 /* Protocols supported by available interfaces */
 164 static int ic_proto_have_if __initdata;
 165
 166 /* MTU for boot device */
 167 static int ic_dev_mtu __initdata;
 168
 169 #ifdef IPCONFIG_DYNAMIC
 170 static DEFINE_SPINLOCK(ic_recv_lock);
 171 static volatile int ic_got_reply __initdata;    /* Proto(s) that replied */
 172 #endif
 173 #ifdef IPCONFIG_DHCP
 174 static int ic_dhcp_msgtype __initdata;  /* DHCP msg type received */
 175 #endif
 176
 177
 178 /*
 179  *      Network devices
 180  */
 181
 182 struct ic_device {
 183         struct ic_device *next;
 184         struct net_device *dev;
 185         unsigned short flags;
 186         short able;
 187         __be32 xid;
 188 };
 189
 190 static struct ic_device *ic_first_dev __initdata;       /* List of open device */
 191 static struct net_device *ic_dev __initdata;            /* Selected device */
 192
 193 static bool __init ic_is_init_dev(struct net_device *dev)
 194 {
 195         if (dev->flags & IFF_LOOPBACK)
 196                 return false;
 197         return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
 198             (!(dev->flags & IFF_LOOPBACK) &&
 199              (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
 200              strncmp(dev->name, "dummy", 5));
 201 }
 202
 203 static int __init ic_open_devs(void)
 204 {
 205         struct ic_device *d, **last;
 206         struct net_device *dev;
 207         unsigned short oflags;
 208         unsigned long start, next_msg;
 209
 210         last = &ic_first_dev;
 211         rtnl_lock();
 212
 213         /* bring loopback and DSA master network devices up first */
 214         for_each_netdev(&init_net, dev) {
 215                 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))
 216                         continue;
 217                 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
 218                         pr_err("IP-Config: Failed to open %s\n", dev->name);
 219         }
 220
 221         for_each_netdev(&init_net, dev) {
 222                 if (ic_is_init_dev(dev)) {
 223                         int able = 0;
 224                         if (dev->mtu >= 364)
 225                                 able |= IC_BOOTP;
 226                         else
 227                                 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n",
 228                                         dev->name, dev->mtu);
 229                         if (!(dev->flags & IFF_NOARP))
 230                                 able |= IC_RARP;
 231                         able &= ic_proto_enabled;
 232                         if (ic_proto_enabled && !able)
 233                                 continue;
 234                         oflags = dev->flags;
 235                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
 236                                 pr_err("IP-Config: Failed to open %s\n",
 237                                        dev->name);
 238                                 continue;
 239                         }
 240                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
 241                                 rtnl_unlock();
 242                                 return -ENOMEM;
 243                         }
 244                         d->dev = dev;
 245                         *last = d;
 246                         last = &d->next;
 247                         d->flags = oflags;
 248                         d->able = able;
 249                         if (able & IC_BOOTP)
 250                                 get_random_bytes(&d->xid, sizeof(__be32));
 251                         else
 252                                 d->xid = 0;
 253                         ic_proto_have_if |= able;
 254                         pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n",
 255                                  dev->name, able, d->xid);
 256                 }
 257         }
 258
 259         /* no point in waiting if we could not bring up at least one device */
 260         if (!ic_first_dev)
 261                 goto have_carrier;
 262
 263         /* wait for a carrier on at least one device */
 264         start = jiffies;
 265         next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
 266         while (time_before(jiffies, start +
 267                            msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) {
 268                 int wait, elapsed;
 269
 270                 for_each_netdev(&init_net, dev)
 271                         if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
 272                                 goto have_carrier;
 273
 274                 msleep(1);
 275
 276                 if (time_before(jiffies, next_msg))
 277                         continue;
 278
 279                 elapsed = jiffies_to_msecs(jiffies - start);
 280                 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
 281                 pr_info("Waiting up to %d more seconds for network.\n", wait);
 282                 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
 283         }
 284 have_carrier:
 285         rtnl_unlock();
 286
 287         *last = NULL;
 288
 289         if (!ic_first_dev) {
 290                 if (user_dev_name[0])
 291                         pr_err("IP-Config: Device `%s' not found\n",
 292                                user_dev_name);
 293                 else
 294                         pr_err("IP-Config: No network devices available\n");
 295                 return -ENODEV;
 296         }
 297         return 0;
 298 }
 299
 300 static void __init ic_close_devs(void)
 301 {
 302         struct ic_device *d, *next;
 303         struct net_device *dev;
 304
 305         rtnl_lock();
 306         next = ic_first_dev;
 307         while ((d = next)) {
 308                 next = d->next;
 309                 dev = d->dev;
 310                 if (dev != ic_dev && !netdev_uses_dsa(dev)) {
 311                         pr_debug("IP-Config: Downing %s\n", dev->name);
 312                         dev_change_flags(dev, d->flags);
 313                 }
 314                 kfree(d);
 315         }
 316         rtnl_unlock();
 317 }
 318
 319 /*
 320  *      Interface to various network functions.
 321  */
 322
 323 static inline void
 324 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
 325 {
 326         sin->sin_family = AF_INET;
 327         sin->sin_addr.s_addr = addr;
 328         sin->sin_port = port;
 329 }
 330
 331 static int __init ic_devinet_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 = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
 338         set_fs(oldfs);
 339         return res;
 340 }
 341
 342 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
 343 {
 344         int res;
 345
 346         mm_segment_t oldfs = get_fs();
 347         set_fs(get_ds());
 348         res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
 349         set_fs(oldfs);
 350         return res;
 351 }
 352
 353 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
 354 {
 355         int res;
 356
 357         mm_segment_t oldfs = get_fs();
 358         set_fs(get_ds());
 359         res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
 360         set_fs(oldfs);
 361         return res;
 362 }
 363
 364 /*
 365  *      Set up interface addresses and routes.
 366  */
 367
 368 static int __init ic_setup_if(void)
 369 {
 370         struct ifreq ir;
 371         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
 372         int err;
 373
 374         memset(&ir, 0, sizeof(ir));
 375         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
 376         set_sockaddr(sin, ic_myaddr, 0);
 377         if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
 378                 pr_err("IP-Config: Unable to set interface address (%d)\n",
 379                        err);
 380                 return -1;
 381         }
 382         set_sockaddr(sin, ic_netmask, 0);
 383         if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
 384                 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
 385                        err);
 386                 return -1;
 387         }
 388         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
 389         if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
 390                 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
 391                        err);
 392                 return -1;
 393         }
 394         /* Handle the case where we need non-standard MTU on the boot link (a network
 395          * using jumbo frames, for instance).  If we can't set the mtu, don't error
 396          * out, we'll try to muddle along.
 397          */
 398         if (ic_dev_mtu != 0) {
 399                 strcpy(ir.ifr_name, ic_dev->name);
 400                 ir.ifr_mtu = ic_dev_mtu;
 401                 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
 402                         pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
 403                                ic_dev_mtu, err);
 404         }
 405         return 0;
 406 }
 407
 408 static int __init ic_setup_routes(void)
 409 {
 410         /* No need to setup device routes, only the default route... */
 411
 412         if (ic_gateway != NONE) {
 413                 struct rtentry rm;
 414                 int err;
 415
 416                 memset(&rm, 0, sizeof(rm));
 417                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
 418                         pr_err("IP-Config: Gateway not on directly connected network\n");
 419                         return -1;
 420                 }
 421                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
 422                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
 423                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
 424                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
 425                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
 426                         pr_err("IP-Config: Cannot add default route (%d)\n",
 427                                err);
 428                         return -1;
 429                 }
 430         }
 431
 432         return 0;
 433 }
 434
 435 /*
 436  *      Fill in default values for all missing parameters.
 437  */
 438
 439 static int __init ic_defaults(void)
 440 {
 441         /*
 442          *      At this point we have no userspace running so need not
 443          *      claim locks on system_utsname
 444          */
 445
 446         if (!ic_host_name_set)
 447                 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
 448
 449         if (root_server_addr == NONE)
 450                 root_server_addr = ic_servaddr;
 451
 452         if (ic_netmask == NONE) {
 453                 if (IN_CLASSA(ntohl(ic_myaddr)))
 454                         ic_netmask = htonl(IN_CLASSA_NET);
 455                 else if (IN_CLASSB(ntohl(ic_myaddr)))
 456                         ic_netmask = htonl(IN_CLASSB_NET);
 457                 else if (IN_CLASSC(ntohl(ic_myaddr)))
 458                         ic_netmask = htonl(IN_CLASSC_NET);
 459                 else {
 460                         pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
 461                                &ic_myaddr);
 462                         return -1;
 463                 }
 464                 pr_notice("IP-Config: Guessing netmask %pI4\n",
 465                           &ic_netmask);
 466         }
 467
 468         return 0;
 469 }
 470
 471 /*
 472  *      RARP support.
 473  */
 474
 475 #ifdef IPCONFIG_RARP
 476
 477 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 478
 479 static struct packet_type rarp_packet_type __initdata = {
 480         .type = cpu_to_be16(ETH_P_RARP),
 481         .func = ic_rarp_recv,
 482 };
 483
 484 static inline void __init ic_rarp_init(void)
 485 {
 486         dev_add_pack(&rarp_packet_type);
 487 }
 488
 489 static inline void __init ic_rarp_cleanup(void)
 490 {
 491         dev_remove_pack(&rarp_packet_type);
 492 }
 493
 494 /*
 495  *  Process received RARP packet.
 496  */
 497 static int __init
 498 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 499 {
 500         struct arphdr *rarp;
 501         unsigned char *rarp_ptr;
 502         __be32 sip, tip;
 503         unsigned char *tha;             /* t for "target" */
 504         struct ic_device *d;
 505
 506         if (!net_eq(dev_net(dev), &init_net))
 507                 goto drop;
 508
 509         skb = skb_share_check(skb, GFP_ATOMIC);
 510         if (!skb)
 511                 return NET_RX_DROP;
 512
 513         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
 514                 goto drop;
 515
 516         /* Basic sanity checks can be done without the lock.  */
 517         rarp = (struct arphdr *)skb_transport_header(skb);
 518
 519         /* If this test doesn't pass, it's not IP, or we should
 520          * ignore it anyway.
 521          */
 522         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
 523                 goto drop;
 524
 525         /* If it's not a RARP reply, delete it. */
 526         if (rarp->ar_op != htons(ARPOP_RREPLY))
 527                 goto drop;
 528
 529         /* If it's not Ethernet, delete it. */
 530         if (rarp->ar_pro != htons(ETH_P_IP))
 531                 goto drop;
 532
 533         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
 534                 goto drop;
 535
 536         /* OK, it is all there and looks valid, process... */
 537         rarp = (struct arphdr *)skb_transport_header(skb);
 538         rarp_ptr = (unsigned char *) (rarp + 1);
 539
 540         /* One reply at a time, please. */
 541         spin_lock(&ic_recv_lock);
 542
 543         /* If we already have a reply, just drop the packet */
 544         if (ic_got_reply)
 545                 goto drop_unlock;
 546
 547         /* Find the ic_device that the packet arrived on */
 548         d = ic_first_dev;
 549         while (d && d->dev != dev)
 550                 d = d->next;
 551         if (!d)
 552                 goto drop_unlock;       /* should never happen */
 553
 554         /* Extract variable-width fields */
 555         rarp_ptr += dev->addr_len;
 556         memcpy(&sip, rarp_ptr, 4);
 557         rarp_ptr += 4;
 558         tha = rarp_ptr;
 559         rarp_ptr += dev->addr_len;
 560         memcpy(&tip, rarp_ptr, 4);
 561
 562         /* Discard packets which are not meant for us. */
 563         if (memcmp(tha, dev->dev_addr, dev->addr_len))
 564                 goto drop_unlock;
 565
 566         /* Discard packets which are not from specified server. */
 567         if (ic_servaddr != NONE && ic_servaddr != sip)
 568                 goto drop_unlock;
 569
 570         /* We have a winner! */
 571         ic_dev = dev;
 572         if (ic_myaddr == NONE)
 573                 ic_myaddr = tip;
 574         ic_servaddr = sip;
 575         ic_addrservaddr = sip;
 576         ic_got_reply = IC_RARP;
 577
 578 drop_unlock:
 579         /* Show's over.  Nothing to see here.  */
 580         spin_unlock(&ic_recv_lock);
 581
 582 drop:
 583         /* Throw the packet out. */
 584         kfree_skb(skb);
 585         return 0;
 586 }
 587
 588
 589 /*
 590  *  Send RARP request packet over a single interface.
 591  */
 592 static void __init ic_rarp_send_if(struct ic_device *d)
 593 {
 594         struct net_device *dev = d->dev;
 595         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
 596                  dev->dev_addr, dev->dev_addr);
 597 }
 598 #endif
 599
 600 /*
 601  *  Predefine Nameservers
 602  */
 603 static inline void __init ic_nameservers_predef(void)
 604 {
 605         int i;
 606
 607         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
 608                 ic_nameservers[i] = NONE;
 609 }
 610
 611 /*
 612  *      DHCP/BOOTP support.
 613  */
 614
 615 #ifdef IPCONFIG_BOOTP
 616
 617 struct bootp_pkt {              /* BOOTP packet format */
 618         struct iphdr iph;       /* IP header */
 619         struct udphdr udph;     /* UDP header */
 620         u8 op;                  /* 1=request, 2=reply */
 621         u8 htype;               /* HW address type */
 622         u8 hlen;                /* HW address length */
 623         u8 hops;                /* Used only by gateways */
 624         __be32 xid;             /* Transaction ID */
 625         __be16 secs;            /* Seconds since we started */
 626         __be16 flags;           /* Just what it says */
 627         __be32 client_ip;               /* Client's IP address if known */
 628         __be32 your_ip;         /* Assigned IP address */
 629         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
 630         __be32 relay_ip;                /* IP address of BOOTP relay */
 631         u8 hw_addr[16];         /* Client's HW address */
 632         u8 serv_name[64];       /* Server host name */
 633         u8 boot_file[128];      /* Name of boot file */
 634         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
 635 };
 636
 637 /* packet ops */
 638 #define BOOTP_REQUEST   1
 639 #define BOOTP_REPLY     2
 640
 641 /* DHCP message types */
 642 #define DHCPDISCOVER    1
 643 #define DHCPOFFER       2
 644 #define DHCPREQUEST     3
 645 #define DHCPDECLINE     4
 646 #define DHCPACK         5
 647 #define DHCPNAK         6
 648 #define DHCPRELEASE     7
 649 #define DHCPINFORM      8
 650
 651 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 652
 653 static struct packet_type bootp_packet_type __initdata = {
 654         .type = cpu_to_be16(ETH_P_IP),
 655         .func = ic_bootp_recv,
 656 };
 657
 658 static __be32 ic_dev_xid;               /* Device under configuration */
 659
 660 /*
 661  *  Initialize DHCP/BOOTP extension fields in the request.
 662  */
 663
 664 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
 665
 666 #ifdef IPCONFIG_DHCP
 667
 668 static void __init
 669 ic_dhcp_init_options(u8 *options)
 670 {
 671         u8 mt = ((ic_servaddr == NONE)
 672                  ? DHCPDISCOVER : DHCPREQUEST);
 673         u8 *e = options;
 674         int len;
 675
 676         pr_debug("DHCP: Sending message type %d\n", mt);
 677
 678         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 679         e += 4;
 680
 681         *e++ = 53;              /* DHCP message type */
 682         *e++ = 1;
 683         *e++ = mt;
 684
 685         if (mt == DHCPREQUEST) {
 686                 *e++ = 54;      /* Server ID (IP address) */
 687                 *e++ = 4;
 688                 memcpy(e, &ic_servaddr, 4);
 689                 e += 4;
 690
 691                 *e++ = 50;      /* Requested IP address */
 692                 *e++ = 4;
 693                 memcpy(e, &ic_myaddr, 4);
 694                 e += 4;
 695         }
 696
 697         /* always? */
 698         {
 699                 static const u8 ic_req_params[] = {
 700                         1,      /* Subnet mask */
 701                         3,      /* Default gateway */
 702                         6,      /* DNS server */
 703                         12,     /* Host name */
 704                         15,     /* Domain name */
 705                         17,     /* Boot path */
 706                         26,     /* MTU */
 707                         40,     /* NIS domain name */
 708                 };
 709
 710                 *e++ = 55;      /* Parameter request list */
 711                 *e++ = sizeof(ic_req_params);
 712                 memcpy(e, ic_req_params, sizeof(ic_req_params));
 713                 e += sizeof(ic_req_params);
 714
 715                 if (ic_host_name_set) {
 716                         *e++ = 12;      /* host-name */
 717                         len = strlen(utsname()->nodename);
 718                         *e++ = len;
 719                         memcpy(e, utsname()->nodename, len);
 720                         e += len;
 721                 }
 722                 if (*vendor_class_identifier) {
 723                         pr_info("DHCP: sending class identifier \"%s\"\n",
 724                                 vendor_class_identifier);
 725                         *e++ = 60;      /* Class-identifier */
 726                         len = strlen(vendor_class_identifier);
 727                         *e++ = len;
 728                         memcpy(e, vendor_class_identifier, len);
 729                         e += len;
 730                 }
 731                 len = strlen(dhcp_client_identifier + 1);
 732                 /* the minimum length of identifier is 2, include 1 byte type,
 733                  * and can not be larger than the length of options
 734                  */
 735                 if (len >= 1 && len < 312 - (e - options) - 1) {
 736                         *e++ = 61;
 737                         *e++ = len + 1;
 738                         memcpy(e, dhcp_client_identifier, len + 1);
 739                         e += len + 1;
 740                 }
 741         }
 742
 743         *e++ = 255;     /* End of the list */
 744 }
 745
 746 #endif /* IPCONFIG_DHCP */
 747
 748 static void __init ic_bootp_init_ext(u8 *e)
 749 {
 750         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 751         e += 4;
 752         *e++ = 1;               /* Subnet mask request */
 753         *e++ = 4;
 754         e += 4;
 755         *e++ = 3;               /* Default gateway request */
 756         *e++ = 4;
 757         e += 4;
 758         *e++ = 5;               /* Name server request */
 759         *e++ = 8;
 760         e += 8;
 761         *e++ = 12;              /* Host name request */
 762         *e++ = 32;
 763         e += 32;
 764         *e++ = 40;              /* NIS Domain name request */
 765         *e++ = 32;
 766         e += 32;
 767         *e++ = 17;              /* Boot path */
 768         *e++ = 40;
 769         e += 40;
 770
 771         *e++ = 57;              /* set extension buffer size for reply */
 772         *e++ = 2;
 773         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
 774         *e++ = 150;
 775
 776         *e++ = 255;             /* End of the list */
 777 }
 778
 779
 780 /*
 781  *  Initialize the DHCP/BOOTP mechanism.
 782  */
 783 static inline void __init ic_bootp_init(void)
 784 {
 785         ic_nameservers_predef();
 786
 787         dev_add_pack(&bootp_packet_type);
 788 }
 789
 790
 791 /*
 792  *  DHCP/BOOTP cleanup.
 793  */
 794 static inline void __init ic_bootp_cleanup(void)
 795 {
 796         dev_remove_pack(&bootp_packet_type);
 797 }
 798
 799
 800 /*
 801  *  Send DHCP/BOOTP request to single interface.
 802  */
 803 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
 804 {
 805         struct net_device *dev = d->dev;
 806         struct sk_buff *skb;
 807         struct bootp_pkt *b;
 808         struct iphdr *h;
 809         int hlen = LL_RESERVED_SPACE(dev);
 810         int tlen = dev->needed_tailroom;
 811
 812         /* Allocate packet */
 813         skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
 814                         GFP_KERNEL);
 815         if (!skb)
 816                 return;
 817         skb_reserve(skb, hlen);
 818         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
 819         memset(b, 0, sizeof(struct bootp_pkt));
 820
 821         /* Construct IP header */
 822         skb_reset_network_header(skb);
 823         h = ip_hdr(skb);
 824         h->version = 4;
 825         h->ihl = 5;
 826         h->tot_len = htons(sizeof(struct bootp_pkt));
 827         h->frag_off = htons(IP_DF);
 828         h->ttl = 64;
 829         h->protocol = IPPROTO_UDP;
 830         h->daddr = htonl(INADDR_BROADCAST);
 831         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
 832
 833         /* Construct UDP header */
 834         b->udph.source = htons(68);
 835         b->udph.dest = htons(67);
 836         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
 837         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
 838
 839         /* Construct DHCP/BOOTP header */
 840         b->op = BOOTP_REQUEST;
 841         if (dev->type < 256) /* check for false types */
 842                 b->htype = dev->type;
 843         else if (dev->type == ARPHRD_FDDI)
 844                 b->htype = ARPHRD_ETHER;
 845         else {
 846                 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type,
 847                         dev->name);
 848                 b->htype = dev->type; /* can cause undefined behavior */
 849         }
 850
 851         /* server_ip and your_ip address are both already zero per RFC2131 */
 852         b->hlen = dev->addr_len;
 853         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
 854         b->secs = htons(jiffies_diff / HZ);
 855         b->xid = d->xid;
 856
 857         /* add DHCP options or BOOTP extensions */
 858 #ifdef IPCONFIG_DHCP
 859         if (ic_proto_enabled & IC_USE_DHCP)
 860                 ic_dhcp_init_options(b->exten);
 861         else
 862 #endif
 863                 ic_bootp_init_ext(b->exten);
 864
 865         /* Chain packet down the line... */
 866         skb->dev = dev;
 867         skb->protocol = htons(ETH_P_IP);
 868         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
 869                             dev->broadcast, dev->dev_addr, skb->len) < 0) {
 870                 kfree_skb(skb);
 871                 printk("E");
 872                 return;
 873         }
 874
 875         if (dev_queue_xmit(skb) < 0)
 876                 printk("E");
 877 }
 878
 879
 880 /*
 881  *  Copy BOOTP-supplied string if not already set.
 882  */
 883 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
 884 {
 885         if (!len)
 886                 return 0;
 887         if (len > max-1)
 888                 len = max-1;
 889         memcpy(dest, src, len);
 890         dest[len] = '\0';
 891         return 1;
 892 }
 893
 894
 895 /*
 896  *  Process BOOTP extensions.
 897  */
 898 static void __init ic_do_bootp_ext(u8 *ext)
 899 {
 900         u8 servers;
 901         int i;
 902         __be16 mtu;
 903
 904         u8 *c;
 905
 906         pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
 907         for (c=ext+2; c<ext+2+ext[1]; c++)
 908                 pr_debug(" %02x", *c);
 909         pr_debug("\n");
 910
 911         switch (*ext++) {
 912         case 1:         /* Subnet mask */
 913                 if (ic_netmask == NONE)
 914                         memcpy(&ic_netmask, ext+1, 4);
 915                 break;
 916         case 3:         /* Default gateway */
 917                 if (ic_gateway == NONE)
 918                         memcpy(&ic_gateway, ext+1, 4);
 919                 break;
 920         case 6:         /* DNS server */
 921                 servers= *ext/4;
 922                 if (servers > CONF_NAMESERVERS_MAX)
 923                         servers = CONF_NAMESERVERS_MAX;
 924                 for (i = 0; i < servers; i++) {
 925                         if (ic_nameservers[i] == NONE)
 926                                 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
 927                 }
 928                 break;
 929         case 12:        /* Host name */
 930                 ic_bootp_string(utsname()->nodename, ext+1, *ext,
 931                                 __NEW_UTS_LEN);
 932                 ic_host_name_set = 1;
 933                 break;
 934         case 15:        /* Domain name (DNS) */
 935                 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
 936                 break;
 937         case 17:        /* Root path */
 938                 if (!root_server_path[0])
 939                         ic_bootp_string(root_server_path, ext+1, *ext,
 940                                         sizeof(root_server_path));
 941                 break;
 942         case 26:        /* Interface MTU */
 943                 memcpy(&mtu, ext+1, sizeof(mtu));
 944                 ic_dev_mtu = ntohs(mtu);
 945                 break;
 946         case 40:        /* NIS Domain name (_not_ DNS) */
 947                 ic_bootp_string(utsname()->domainname, ext+1, *ext,
 948                                 __NEW_UTS_LEN);
 949                 break;
 950         }
 951 }
 952
 953
 954 /*
 955  *  Receive BOOTP reply.
 956  */
 957 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 958 {
 959         struct bootp_pkt *b;
 960         struct iphdr *h;
 961         struct ic_device *d;
 962         int len, ext_len;
 963
 964         if (!net_eq(dev_net(dev), &init_net))
 965                 goto drop;
 966
 967         /* Perform verifications before taking the lock.  */
 968         if (skb->pkt_type == PACKET_OTHERHOST)
 969                 goto drop;
 970
 971         skb = skb_share_check(skb, GFP_ATOMIC);
 972         if (!skb)
 973                 return NET_RX_DROP;
 974
 975         if (!pskb_may_pull(skb,
 976                            sizeof(struct iphdr) +
 977                            sizeof(struct udphdr)))
 978                 goto drop;
 979
 980         b = (struct bootp_pkt *)skb_network_header(skb);
 981         h = &b->iph;
 982
 983         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
 984                 goto drop;
 985
 986         /* Fragments are not supported */
 987         if (ip_is_fragment(h)) {
 988                 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
 989                 goto drop;
 990         }
 991
 992         if (skb->len < ntohs(h->tot_len))
 993                 goto drop;
 994
 995         if (ip_fast_csum((char *) h, h->ihl))
 996                 goto drop;
 997
 998         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
 999                 goto drop;
1000
1001         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
1002                 goto drop;
1003
1004         len = ntohs(b->udph.len) - sizeof(struct udphdr);
1005         ext_len = len - (sizeof(*b) -
1006                          sizeof(struct iphdr) -
1007                          sizeof(struct udphdr) -
1008                          sizeof(b->exten));
1009         if (ext_len < 0)
1010                 goto drop;
1011
1012         /* Ok the front looks good, make sure we can get at the rest.  */
1013         if (!pskb_may_pull(skb, skb->len))
1014                 goto drop;
1015
1016         b = (struct bootp_pkt *)skb_network_header(skb);
1017         h = &b->iph;
1018
1019         /* One reply at a time, please. */
1020         spin_lock(&ic_recv_lock);
1021
1022         /* If we already have a reply, just drop the packet */
1023         if (ic_got_reply)
1024                 goto drop_unlock;
1025
1026         /* Find the ic_device that the packet arrived on */
1027         d = ic_first_dev;
1028         while (d && d->dev != dev)
1029                 d = d->next;
1030         if (!d)
1031                 goto drop_unlock;  /* should never happen */
1032
1033         /* Is it a reply to our BOOTP request? */
1034         if (b->op != BOOTP_REPLY ||
1035             b->xid != d->xid) {
1036                 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1037                                     b->op, b->xid);
1038                 goto drop_unlock;
1039         }
1040
1041         /* Is it a reply for the device we are configuring? */
1042         if (b->xid != ic_dev_xid) {
1043                 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1044                 goto drop_unlock;
1045         }
1046
1047         /* Parse extensions */
1048         if (ext_len >= 4 &&
1049             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1050                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1051                 u8 *ext;
1052
1053 #ifdef IPCONFIG_DHCP
1054                 if (ic_proto_enabled & IC_USE_DHCP) {
1055                         __be32 server_id = NONE;
1056                         int mt = 0;
1057
1058                         ext = &b->exten[4];
1059                         while (ext < end && *ext != 0xff) {
1060                                 u8 *opt = ext++;
1061                                 if (*opt == 0)  /* Padding */
1062                                         continue;
1063                                 ext += *ext + 1;
1064                                 if (ext >= end)
1065                                         break;
1066                                 switch (*opt) {
1067                                 case 53:        /* Message type */
1068                                         if (opt[1])
1069                                                 mt = opt[2];
1070                                         break;
1071                                 case 54:        /* Server ID (IP address) */
1072                                         if (opt[1] >= 4)
1073                                                 memcpy(&server_id, opt + 2, 4);
1074                                         break;
1075                                 }
1076                         }
1077
1078                         pr_debug("DHCP: Got message type %d\n", mt);
1079
1080                         switch (mt) {
1081                         case DHCPOFFER:
1082                                 /* While in the process of accepting one offer,
1083                                  * ignore all others.
1084                                  */
1085                                 if (ic_myaddr != NONE)
1086                                         goto drop_unlock;
1087
1088                                 /* Let's accept that offer. */
1089                                 ic_myaddr = b->your_ip;
1090                                 ic_servaddr = server_id;
1091                                 pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
1092                                          &ic_myaddr, &b->iph.saddr);
1093                                 /* The DHCP indicated server address takes
1094                                  * precedence over the bootp header one if
1095                                  * they are different.
1096                                  */
1097                                 if ((server_id != NONE) &&
1098                                     (b->server_ip != server_id))
1099                                         b->server_ip = ic_servaddr;
1100                                 break;
1101
1102                         case DHCPACK:
1103                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1104                                         goto drop_unlock;
1105
1106                                 /* Yeah! */
1107                                 break;
1108
1109                         default:
1110                                 /* Urque.  Forget it*/
1111                                 ic_myaddr = NONE;
1112                                 ic_servaddr = NONE;
1113                                 goto drop_unlock;
1114                         }
1115
1116                         ic_dhcp_msgtype = mt;
1117
1118                 }
1119 #endif /* IPCONFIG_DHCP */
1120
1121                 ext = &b->exten[4];
1122                 while (ext < end && *ext != 0xff) {
1123                         u8 *opt = ext++;
1124                         if (*opt == 0)  /* Padding */
1125                                 continue;
1126                         ext += *ext + 1;
1127                         if (ext < end)
1128                                 ic_do_bootp_ext(opt);
1129                 }
1130         }
1131
1132         /* We have a winner! */
1133         ic_dev = dev;
1134         ic_myaddr = b->your_ip;
1135         ic_servaddr = b->server_ip;
1136         ic_addrservaddr = b->iph.saddr;
1137         if (ic_gateway == NONE && b->relay_ip)
1138                 ic_gateway = b->relay_ip;
1139         if (ic_nameservers[0] == NONE)
1140                 ic_nameservers[0] = ic_servaddr;
1141         ic_got_reply = IC_BOOTP;
1142
1143 drop_unlock:
1144         /* Show's over.  Nothing to see here.  */
1145         spin_unlock(&ic_recv_lock);
1146
1147 drop:
1148         /* Throw the packet out. */
1149         kfree_skb(skb);
1150
1151         return 0;
1152 }
1153
1154
1155 #endif
1156
1157
1158 /*
1159  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1160  */
1161
1162 #ifdef IPCONFIG_DYNAMIC
1163
1164 static int __init ic_dynamic(void)
1165 {
1166         int retries;
1167         struct ic_device *d;
1168         unsigned long start_jiffies, timeout, jiff;
1169         int do_bootp = ic_proto_have_if & IC_BOOTP;
1170         int do_rarp = ic_proto_have_if & IC_RARP;
1171
1172         /*
1173          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1174          * This routine gets only called when some pieces of information
1175          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1176          */
1177         if (!ic_proto_enabled) {
1178                 pr_err("IP-Config: Incomplete network configuration information\n");
1179                 return -1;
1180         }
1181
1182 #ifdef IPCONFIG_BOOTP
1183         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1184                 pr_err("DHCP/BOOTP: No suitable device found\n");
1185 #endif
1186 #ifdef IPCONFIG_RARP
1187         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1188                 pr_err("RARP: No suitable device found\n");
1189 #endif
1190
1191         if (!ic_proto_have_if)
1192                 /* Error message already printed */
1193                 return -1;
1194
1195         /*
1196          * Setup protocols
1197          */
1198 #ifdef IPCONFIG_BOOTP
1199         if (do_bootp)
1200                 ic_bootp_init();
1201 #endif
1202 #ifdef IPCONFIG_RARP
1203         if (do_rarp)
1204                 ic_rarp_init();
1205 #endif
1206
1207         /*
1208          * Send requests and wait, until we get an answer. This loop
1209          * seems to be a terrible waste of CPU time, but actually there is
1210          * only one process running at all, so we don't need to use any
1211          * scheduler functions.
1212          * [Actually we could now, but the nothing else running note still
1213          *  applies.. - AC]
1214          */
1215         pr_notice("Sending %s%s%s requests .",
1216                   do_bootp
1217                   ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1218                   (do_bootp && do_rarp) ? " and " : "",
1219                   do_rarp ? "RARP" : "");
1220
1221         start_jiffies = jiffies;
1222         d = ic_first_dev;
1223         retries = CONF_SEND_RETRIES;
1224         get_random_bytes(&timeout, sizeof(timeout));
1225         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1226         for (;;) {
1227 #ifdef IPCONFIG_BOOTP
1228                 /* Track the device we are configuring */
1229                 ic_dev_xid = d->xid;
1230
1231                 if (do_bootp && (d->able & IC_BOOTP))
1232                         ic_bootp_send_if(d, jiffies - start_jiffies);
1233 #endif
1234 #ifdef IPCONFIG_RARP
1235                 if (do_rarp && (d->able & IC_RARP))
1236                         ic_rarp_send_if(d);
1237 #endif
1238
1239                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1240                 while (time_before(jiffies, jiff) && !ic_got_reply)
1241                         schedule_timeout_uninterruptible(1);
1242 #ifdef IPCONFIG_DHCP
1243                 /* DHCP isn't done until we get a DHCPACK. */
1244                 if ((ic_got_reply & IC_BOOTP) &&
1245                     (ic_proto_enabled & IC_USE_DHCP) &&
1246                     ic_dhcp_msgtype != DHCPACK) {
1247                         ic_got_reply = 0;
1248                         pr_cont(",");
1249                         continue;
1250                 }
1251 #endif /* IPCONFIG_DHCP */
1252
1253                 if (ic_got_reply) {
1254                         pr_cont(" OK\n");
1255                         break;
1256                 }
1257
1258                 if ((d = d->next))
1259                         continue;
1260
1261                 if (! --retries) {
1262                         pr_cont(" timed out!\n");
1263                         break;
1264                 }
1265
1266                 d = ic_first_dev;
1267
1268                 timeout = timeout CONF_TIMEOUT_MULT;
1269                 if (timeout > CONF_TIMEOUT_MAX)
1270                         timeout = CONF_TIMEOUT_MAX;
1271
1272                 pr_cont(".");
1273         }
1274
1275 #ifdef IPCONFIG_BOOTP
1276         if (do_bootp)
1277                 ic_bootp_cleanup();
1278 #endif
1279 #ifdef IPCONFIG_RARP
1280         if (do_rarp)
1281                 ic_rarp_cleanup();
1282 #endif
1283
1284         if (!ic_got_reply) {
1285                 ic_myaddr = NONE;
1286                 return -1;
1287         }
1288
1289         pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
1290                 ((ic_got_reply & IC_RARP) ? "RARP"
1291                 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1292                 &ic_addrservaddr, &ic_myaddr);
1293
1294         return 0;
1295 }
1296
1297 #endif /* IPCONFIG_DYNAMIC */
1298
1299 #ifdef CONFIG_PROC_FS
1300
1301 static int pnp_seq_show(struct seq_file *seq, void *v)
1302 {
1303         int i;
1304
1305         if (ic_proto_used & IC_PROTO)
1306                 seq_printf(seq, "#PROTO: %s\n",
1307                            (ic_proto_used & IC_RARP) ? "RARP"
1308                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1309         else
1310                 seq_puts(seq, "#MANUAL\n");
1311
1312         if (ic_domain[0])
1313                 seq_printf(seq,
1314                            "domain %s\n", ic_domain);
1315         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1316                 if (ic_nameservers[i] != NONE)
1317                         seq_printf(seq, "nameserver %pI4\n",
1318                                    &ic_nameservers[i]);
1319         }
1320         if (ic_servaddr != NONE)
1321                 seq_printf(seq, "bootserver %pI4\n",
1322                            &ic_servaddr);
1323         return 0;
1324 }
1325
1326 static int pnp_seq_open(struct inode *indoe, struct file *file)
1327 {
1328         return single_open(file, pnp_seq_show, NULL);
1329 }
1330
1331 static const struct file_operations pnp_seq_fops = {
1332         .owner          = THIS_MODULE,
1333         .open           = pnp_seq_open,
1334         .read           = seq_read,
1335         .llseek         = seq_lseek,
1336         .release        = single_release,
1337 };
1338 #endif /* CONFIG_PROC_FS */
1339
1340 /*
1341  *  Extract IP address from the parameter string if needed. Note that we
1342  *  need to have root_server_addr set _before_ IPConfig gets called as it
1343  *  can override it.
1344  */
1345 __be32 __init root_nfs_parse_addr(char *name)
1346 {
1347         __be32 addr;
1348         int octets = 0;
1349         char *cp, *cq;
1350
1351         cp = cq = name;
1352         while (octets < 4) {
1353                 while (*cp >= '0' && *cp <= '9')
1354                         cp++;
1355                 if (cp == cq || cp - cq > 3)
1356                         break;
1357                 if (*cp == '.' || octets == 3)
1358                         octets++;
1359                 if (octets < 4)
1360                         cp++;
1361                 cq = cp;
1362         }
1363         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1364                 if (*cp == ':')
1365                         *cp++ = '\0';
1366                 addr = in_aton(name);
1367                 memmove(name, cp, strlen(cp) + 1);
1368         } else
1369                 addr = NONE;
1370
1371         return addr;
1372 }
1373
1374 #define DEVICE_WAIT_MAX         12 /* 12 seconds */
1375
1376 static int __init wait_for_devices(void)
1377 {
1378         int i;
1379
1380         for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1381                 struct net_device *dev;
1382                 int found = 0;
1383
1384                 rtnl_lock();
1385                 for_each_netdev(&init_net, dev) {
1386                         if (ic_is_init_dev(dev)) {
1387                                 found = 1;
1388                                 break;
1389                         }
1390                 }
1391                 rtnl_unlock();
1392                 if (found)
1393                         return 0;
1394                 ssleep(1);
1395         }
1396         return -ENODEV;
1397 }
1398
1399 /*
1400  *      IP Autoconfig dispatcher.
1401  */
1402
1403 static int __init ip_auto_config(void)
1404 {
1405         __be32 addr;
1406 #ifdef IPCONFIG_DYNAMIC
1407         int retries = CONF_OPEN_RETRIES;
1408 #endif
1409         int err;
1410         unsigned int i;
1411
1412 #ifdef CONFIG_PROC_FS
1413         proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1414 #endif /* CONFIG_PROC_FS */
1415
1416         if (!ic_enable)
1417                 return 0;
1418
1419         pr_debug("IP-Config: Entered.\n");
1420 #ifdef IPCONFIG_DYNAMIC
1421  try_try_again:
1422 #endif
1423         /* Wait for devices to appear */
1424         err = wait_for_devices();
1425         if (err)
1426                 return err;
1427
1428         /* Setup all network devices */
1429         err = ic_open_devs();
1430         if (err)
1431                 return err;
1432
1433         /* Give drivers a chance to settle */
1434         msleep(CONF_POST_OPEN);
1435
1436         /*
1437          * If the config information is insufficient (e.g., our IP address or
1438          * IP address of the boot server is missing or we have multiple network
1439          * interfaces and no default was set), use BOOTP or RARP to get the
1440          * missing values.
1441          */
1442         if (ic_myaddr == NONE ||
1443 #ifdef CONFIG_ROOT_NFS
1444             (root_server_addr == NONE &&
1445              ic_servaddr == NONE &&
1446              ROOT_DEV == Root_NFS) ||
1447 #endif
1448             ic_first_dev->next) {
1449 #ifdef IPCONFIG_DYNAMIC
1450                 if (ic_dynamic() < 0) {
1451                         ic_close_devs();
1452
1453                         /*
1454                          * I don't know why, but sometimes the
1455                          * eepro100 driver (at least) gets upset and
1456                          * doesn't work the first time it's opened.
1457                          * But then if you close it and reopen it, it
1458                          * works just fine.  So we need to try that at
1459                          * least once before giving up.
1460                          *
1461                          * Also, if the root will be NFS-mounted, we
1462                          * have nowhere to go if DHCP fails.  So we
1463                          * just have to keep trying forever.
1464                          *
1465                          *                              -- Chip
1466                          */
1467 #ifdef CONFIG_ROOT_NFS
1468                         if (ROOT_DEV ==  Root_NFS) {
1469                                 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1470                                 goto try_try_again;
1471                         }
1472 #endif
1473
1474                         if (--retries) {
1475                                 pr_err("IP-Config: Reopening network devices...\n");
1476                                 goto try_try_again;
1477                         }
1478
1479                         /* Oh, well.  At least we tried. */
1480                         pr_err("IP-Config: Auto-configuration of network failed\n");
1481                         return -1;
1482                 }
1483 #else /* !DYNAMIC */
1484                 pr_err("IP-Config: Incomplete network configuration information\n");
1485                 ic_close_devs();
1486                 return -1;
1487 #endif /* IPCONFIG_DYNAMIC */
1488         } else {
1489                 /* Device selected manually or only one device -> use it */
1490                 ic_dev = ic_first_dev->dev;
1491         }
1492
1493         addr = root_nfs_parse_addr(root_server_path);
1494         if (root_server_addr == NONE)
1495                 root_server_addr = addr;
1496
1497         /*
1498          * Use defaults wherever applicable.
1499          */
1500         if (ic_defaults() < 0)
1501                 return -1;
1502
1503         /*
1504          * Close all network devices except the device we've
1505          * autoconfigured and set up routes.
1506          */
1507         ic_close_devs();
1508         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1509                 return -1;
1510
1511         /*
1512          * Record which protocol was actually used.
1513          */
1514 #ifdef IPCONFIG_DYNAMIC
1515         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1516 #endif
1517
1518 #ifndef IPCONFIG_SILENT
1519         /*
1520          * Clue in the operator.
1521          */
1522         pr_info("IP-Config: Complete:\n");
1523
1524         pr_info("     device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1525                 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr,
1526                 &ic_myaddr, &ic_netmask, &ic_gateway);
1527         pr_info("     host=%s, domain=%s, nis-domain=%s\n",
1528                 utsname()->nodename, ic_domain, utsname()->domainname);
1529         pr_info("     bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1530                 &ic_servaddr, &root_server_addr, root_server_path);
1531         if (ic_dev_mtu)
1532                 pr_cont(", mtu=%d", ic_dev_mtu);
1533         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1534                 if (ic_nameservers[i] != NONE) {
1535                         pr_cont("     nameserver%u=%pI4",
1536                                 i, &ic_nameservers[i]);
1537                         break;
1538                 }
1539         for (i++; i < CONF_NAMESERVERS_MAX; i++)
1540                 if (ic_nameservers[i] != NONE)
1541                         pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1542         pr_cont("\n");
1543 #endif /* !SILENT */
1544
1545         return 0;
1546 }
1547
1548 late_initcall(ip_auto_config);
1549
1550
1551 /*
1552  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1553  *  command line parameter.  See Documentation/filesystems/nfs/nfsroot.txt.
1554  */
1555 static int __init ic_proto_name(char *name)
1556 {
1557         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1558                 return 1;
1559         }
1560         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1561                 return 0;
1562         }
1563 #ifdef CONFIG_IP_PNP_DHCP
1564         else if (!strncmp(name, "dhcp", 4)) {
1565                 char *client_id;
1566
1567                 ic_proto_enabled &= ~IC_RARP;
1568                 client_id = strstr(name, "dhcp,");
1569                 if (client_id) {
1570                         char *v;
1571
1572                         client_id = client_id + 5;
1573                         v = strchr(client_id, ',');
1574                         if (!v)
1575                                 return 1;
1576                         *v = 0;
1577                         if (kstrtou8(client_id, 0, dhcp_client_identifier))
1578                                 pr_debug("DHCP: Invalid client identifier type\n");
1579                         strncpy(dhcp_client_identifier + 1, v + 1, 251);
1580                         *v = ',';
1581                 }
1582                 return 1;
1583         }
1584 #endif
1585 #ifdef CONFIG_IP_PNP_BOOTP
1586         else if (!strcmp(name, "bootp")) {
1587                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1588                 return 1;
1589         }
1590 #endif
1591 #ifdef CONFIG_IP_PNP_RARP
1592         else if (!strcmp(name, "rarp")) {
1593                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1594                 return 1;
1595         }
1596 #endif
1597 #ifdef IPCONFIG_DYNAMIC
1598         else if (!strcmp(name, "both")) {
1599                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1600                 return 1;
1601         }
1602 #endif
1603         return 0;
1604 }
1605
1606 static int __init ip_auto_config_setup(char *addrs)
1607 {
1608         char *cp, *ip, *dp;
1609         int num = 0;
1610
1611         ic_set_manually = 1;
1612         ic_enable = 1;
1613
1614         /*
1615          * If any dhcp, bootp etc options are set, leave autoconfig on
1616          * and skip the below static IP processing.
1617          */
1618         if (ic_proto_name(addrs))
1619                 return 1;
1620
1621         /* If no static IP is given, turn off autoconfig and bail.  */
1622         if (*addrs == 0 ||
1623             strcmp(addrs, "off") == 0 ||
1624             strcmp(addrs, "none") == 0) {
1625                 ic_enable = 0;
1626                 return 1;
1627         }
1628
1629         ic_nameservers_predef();
1630
1631         /* Parse string for static IP assignment.  */
1632         ip = addrs;
1633         while (ip && *ip) {
1634                 if ((cp = strchr(ip, ':')))
1635                         *cp++ = '\0';
1636                 if (strlen(ip) > 0) {
1637                         pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip);
1638                         switch (num) {
1639                         case 0:
1640                                 if ((ic_myaddr = in_aton(ip)) == ANY)
1641                                         ic_myaddr = NONE;
1642                                 break;
1643                         case 1:
1644                                 if ((ic_servaddr = in_aton(ip)) == ANY)
1645                                         ic_servaddr = NONE;
1646                                 break;
1647                         case 2:
1648                                 if ((ic_gateway = in_aton(ip)) == ANY)
1649                                         ic_gateway = NONE;
1650                                 break;
1651                         case 3:
1652                                 if ((ic_netmask = in_aton(ip)) == ANY)
1653                                         ic_netmask = NONE;
1654                                 break;
1655                         case 4:
1656                                 if ((dp = strchr(ip, '.'))) {
1657                                         *dp++ = '\0';
1658                                         strlcpy(utsname()->domainname, dp,
1659                                                 sizeof(utsname()->domainname));
1660                                 }
1661                                 strlcpy(utsname()->nodename, ip,
1662                                         sizeof(utsname()->nodename));
1663                                 ic_host_name_set = 1;
1664                                 break;
1665                         case 5:
1666                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1667                                 break;
1668                         case 6:
1669                                 if (ic_proto_name(ip) == 0 &&
1670                                     ic_myaddr == NONE) {
1671                                         ic_enable = 0;
1672                                 }
1673                                 break;
1674                         case 7:
1675                                 if (CONF_NAMESERVERS_MAX >= 1) {
1676                                         ic_nameservers[0] = in_aton(ip);
1677                                         if (ic_nameservers[0] == ANY)
1678                                                 ic_nameservers[0] = NONE;
1679                                 }
1680                                 break;
1681                         case 8:
1682                                 if (CONF_NAMESERVERS_MAX >= 2) {
1683                                         ic_nameservers[1] = in_aton(ip);
1684                                         if (ic_nameservers[1] == ANY)
1685                                                 ic_nameservers[1] = NONE;
1686                                 }
1687                                 break;
1688                         }
1689                 }
1690                 ip = cp;
1691                 num++;
1692         }
1693
1694         return 1;
1695 }
1696 __setup("ip=", ip_auto_config_setup);
1697
1698 static int __init nfsaddrs_config_setup(char *addrs)
1699 {
1700         return ip_auto_config_setup(addrs);
1701 }
1702 __setup("nfsaddrs=", nfsaddrs_config_setup);
1703
1704 static int __init vendor_class_identifier_setup(char *addrs)
1705 {
1706         if (strlcpy(vendor_class_identifier, addrs,
1707                     sizeof(vendor_class_identifier))
1708             >= sizeof(vendor_class_identifier))
1709                 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
1710                         vendor_class_identifier);
1711         return 1;
1712 }
1713 __setup("dhcpclass=", vendor_class_identifier_setup);