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 __be32 ic_addrservaddr = NONE;  /* IP Address of the IP addresses'server */
 131
 132 __be32 ic_servaddr = NONE;      /* Boot server IP address */
 133
 134 __be32 root_server_addr = NONE; /* Address of NFS server */
 135 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
 136
 137 /* vendor class identifier */
 138 static char vendor_class_identifier[253] __initdata;
 139
 140 #if defined(CONFIG_IP_PNP_DHCP)
 141 static char dhcp_client_identifier[253] __initdata;
 142 #endif
 143
 144 /* Persistent data: */
 145
 146 #ifdef IPCONFIG_DYNAMIC
 147 static int ic_proto_used;                       /* Protocol used, if any */
 148 #else
 149 #define ic_proto_used 0
 150 #endif
 151 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
 152 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
 153
 154 /*
 155  * Private state.
 156  */
 157
 158 /* Name of user-selected boot device */
 159 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
 160
 161 /* Protocols supported by available interfaces */
 162 static int ic_proto_have_if __initdata;
 163
 164 /* MTU for boot device */
 165 static int ic_dev_mtu __initdata;
 166
 167 #ifdef IPCONFIG_DYNAMIC
 168 static DEFINE_SPINLOCK(ic_recv_lock);
 169 static volatile int ic_got_reply __initdata;    /* Proto(s) that replied */
 170 #endif
 171 #ifdef IPCONFIG_DHCP
 172 static int ic_dhcp_msgtype __initdata;  /* DHCP msg type received */
 173 #endif
 174
 175
 176 /*
 177  *      Network devices
 178  */
 179
 180 struct ic_device {
 181         struct ic_device *next;
 182         struct net_device *dev;
 183         unsigned short flags;
 184         short able;
 185         __be32 xid;
 186 };
 187
 188 static struct ic_device *ic_first_dev __initdata;       /* List of open device */
 189 static struct net_device *ic_dev __initdata;            /* Selected device */
 190
 191 static bool __init ic_is_init_dev(struct net_device *dev)
 192 {
 193         if (dev->flags & IFF_LOOPBACK)
 194                 return false;
 195         return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
 196             (!(dev->flags & IFF_LOOPBACK) &&
 197              (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
 198              strncmp(dev->name, "dummy", 5));
 199 }
 200
 201 static int __init ic_open_devs(void)
 202 {
 203         struct ic_device *d, **last;
 204         struct net_device *dev;
 205         unsigned short oflags;
 206         unsigned long start, next_msg;
 207
 208         last = &ic_first_dev;
 209         rtnl_lock();
 210
 211         /* bring loopback and DSA master network devices up first */
 212         for_each_netdev(&init_net, dev) {
 213                 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))
 214                         continue;
 215                 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
 216                         pr_err("IP-Config: Failed to open %s\n", dev->name);
 217         }
 218
 219         for_each_netdev(&init_net, dev) {
 220                 if (ic_is_init_dev(dev)) {
 221                         int able = 0;
 222                         if (dev->mtu >= 364)
 223                                 able |= IC_BOOTP;
 224                         else
 225                                 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n",
 226                                         dev->name, dev->mtu);
 227                         if (!(dev->flags & IFF_NOARP))
 228                                 able |= IC_RARP;
 229                         able &= ic_proto_enabled;
 230                         if (ic_proto_enabled && !able)
 231                                 continue;
 232                         oflags = dev->flags;
 233                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
 234                                 pr_err("IP-Config: Failed to open %s\n",
 235                                        dev->name);
 236                                 continue;
 237                         }
 238                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
 239                                 rtnl_unlock();
 240                                 return -ENOMEM;
 241                         }
 242                         d->dev = dev;
 243                         *last = d;
 244                         last = &d->next;
 245                         d->flags = oflags;
 246                         d->able = able;
 247                         if (able & IC_BOOTP)
 248                                 get_random_bytes(&d->xid, sizeof(__be32));
 249                         else
 250                                 d->xid = 0;
 251                         ic_proto_have_if |= able;
 252                         pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n",
 253                                  dev->name, able, d->xid);
 254                 }
 255         }
 256
 257         /* no point in waiting if we could not bring up at least one device */
 258         if (!ic_first_dev)
 259                 goto have_carrier;
 260
 261         /* wait for a carrier on at least one device */
 262         start = jiffies;
 263         next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
 264         while (time_before(jiffies, start +
 265                            msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) {
 266                 int wait, elapsed;
 267
 268                 for_each_netdev(&init_net, dev)
 269                         if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
 270                                 goto have_carrier;
 271
 272                 msleep(1);
 273
 274                 if (time_before(jiffies, next_msg))
 275                         continue;
 276
 277                 elapsed = jiffies_to_msecs(jiffies - start);
 278                 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
 279                 pr_info("Waiting up to %d more seconds for network.\n", wait);
 280                 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
 281         }
 282 have_carrier:
 283         rtnl_unlock();
 284
 285         *last = NULL;
 286
 287         if (!ic_first_dev) {
 288                 if (user_dev_name[0])
 289                         pr_err("IP-Config: Device `%s' not found\n",
 290                                user_dev_name);
 291                 else
 292                         pr_err("IP-Config: No network devices available\n");
 293                 return -ENODEV;
 294         }
 295         return 0;
 296 }
 297
 298 static void __init ic_close_devs(void)
 299 {
 300         struct ic_device *d, *next;
 301         struct net_device *dev;
 302
 303         rtnl_lock();
 304         next = ic_first_dev;
 305         while ((d = next)) {
 306                 next = d->next;
 307                 dev = d->dev;
 308                 if (dev != ic_dev && !netdev_uses_dsa(dev)) {
 309                         pr_debug("IP-Config: Downing %s\n", dev->name);
 310                         dev_change_flags(dev, d->flags);
 311                 }
 312                 kfree(d);
 313         }
 314         rtnl_unlock();
 315 }
 316
 317 /*
 318  *      Interface to various network functions.
 319  */
 320
 321 static inline void
 322 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
 323 {
 324         sin->sin_family = AF_INET;
 325         sin->sin_addr.s_addr = addr;
 326         sin->sin_port = port;
 327 }
 328
 329 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
 330 {
 331         int res;
 332
 333         mm_segment_t oldfs = get_fs();
 334         set_fs(get_ds());
 335         res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
 336         set_fs(oldfs);
 337         return res;
 338 }
 339
 340 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
 341 {
 342         int res;
 343
 344         mm_segment_t oldfs = get_fs();
 345         set_fs(get_ds());
 346         res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
 347         set_fs(oldfs);
 348         return res;
 349 }
 350
 351 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
 352 {
 353         int res;
 354
 355         mm_segment_t oldfs = get_fs();
 356         set_fs(get_ds());
 357         res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
 358         set_fs(oldfs);
 359         return res;
 360 }
 361
 362 /*
 363  *      Set up interface addresses and routes.
 364  */
 365
 366 static int __init ic_setup_if(void)
 367 {
 368         struct ifreq ir;
 369         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
 370         int err;
 371
 372         memset(&ir, 0, sizeof(ir));
 373         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
 374         set_sockaddr(sin, ic_myaddr, 0);
 375         if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
 376                 pr_err("IP-Config: Unable to set interface address (%d)\n",
 377                        err);
 378                 return -1;
 379         }
 380         set_sockaddr(sin, ic_netmask, 0);
 381         if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
 382                 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
 383                        err);
 384                 return -1;
 385         }
 386         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
 387         if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
 388                 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
 389                        err);
 390                 return -1;
 391         }
 392         /* Handle the case where we need non-standard MTU on the boot link (a network
 393          * using jumbo frames, for instance).  If we can't set the mtu, don't error
 394          * out, we'll try to muddle along.
 395          */
 396         if (ic_dev_mtu != 0) {
 397                 strcpy(ir.ifr_name, ic_dev->name);
 398                 ir.ifr_mtu = ic_dev_mtu;
 399                 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
 400                         pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
 401                                ic_dev_mtu, err);
 402         }
 403         return 0;
 404 }
 405
 406 static int __init ic_setup_routes(void)
 407 {
 408         /* No need to setup device routes, only the default route... */
 409
 410         if (ic_gateway != NONE) {
 411                 struct rtentry rm;
 412                 int err;
 413
 414                 memset(&rm, 0, sizeof(rm));
 415                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
 416                         pr_err("IP-Config: Gateway not on directly connected network\n");
 417                         return -1;
 418                 }
 419                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
 420                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
 421                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
 422                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
 423                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
 424                         pr_err("IP-Config: Cannot add default route (%d)\n",
 425                                err);
 426                         return -1;
 427                 }
 428         }
 429
 430         return 0;
 431 }
 432
 433 /*
 434  *      Fill in default values for all missing parameters.
 435  */
 436
 437 static int __init ic_defaults(void)
 438 {
 439         /*
 440          *      At this point we have no userspace running so need not
 441          *      claim locks on system_utsname
 442          */
 443
 444         if (!ic_host_name_set)
 445                 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
 446
 447         if (root_server_addr == NONE)
 448                 root_server_addr = ic_servaddr;
 449
 450         if (ic_netmask == NONE) {
 451                 if (IN_CLASSA(ntohl(ic_myaddr)))
 452                         ic_netmask = htonl(IN_CLASSA_NET);
 453                 else if (IN_CLASSB(ntohl(ic_myaddr)))
 454                         ic_netmask = htonl(IN_CLASSB_NET);
 455                 else if (IN_CLASSC(ntohl(ic_myaddr)))
 456                         ic_netmask = htonl(IN_CLASSC_NET);
 457                 else {
 458                         pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
 459                                &ic_myaddr);
 460                         return -1;
 461                 }
 462                 pr_notice("IP-Config: Guessing netmask %pI4\n",
 463                           &ic_netmask);
 464         }
 465
 466         return 0;
 467 }
 468
 469 /*
 470  *      RARP support.
 471  */
 472
 473 #ifdef IPCONFIG_RARP
 474
 475 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 476
 477 static struct packet_type rarp_packet_type __initdata = {
 478         .type = cpu_to_be16(ETH_P_RARP),
 479         .func = ic_rarp_recv,
 480 };
 481
 482 static inline void __init ic_rarp_init(void)
 483 {
 484         dev_add_pack(&rarp_packet_type);
 485 }
 486
 487 static inline void __init ic_rarp_cleanup(void)
 488 {
 489         dev_remove_pack(&rarp_packet_type);
 490 }
 491
 492 /*
 493  *  Process received RARP packet.
 494  */
 495 static int __init
 496 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 497 {
 498         struct arphdr *rarp;
 499         unsigned char *rarp_ptr;
 500         __be32 sip, tip;
 501         unsigned char *tha;             /* t for "target" */
 502         struct ic_device *d;
 503
 504         if (!net_eq(dev_net(dev), &init_net))
 505                 goto drop;
 506
 507         skb = skb_share_check(skb, GFP_ATOMIC);
 508         if (!skb)
 509                 return NET_RX_DROP;
 510
 511         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
 512                 goto drop;
 513
 514         /* Basic sanity checks can be done without the lock.  */
 515         rarp = (struct arphdr *)skb_transport_header(skb);
 516
 517         /* If this test doesn't pass, it's not IP, or we should
 518          * ignore it anyway.
 519          */
 520         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
 521                 goto drop;
 522
 523         /* If it's not a RARP reply, delete it. */
 524         if (rarp->ar_op != htons(ARPOP_RREPLY))
 525                 goto drop;
 526
 527         /* If it's not Ethernet, delete it. */
 528         if (rarp->ar_pro != htons(ETH_P_IP))
 529                 goto drop;
 530
 531         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
 532                 goto drop;
 533
 534         /* OK, it is all there and looks valid, process... */
 535         rarp = (struct arphdr *)skb_transport_header(skb);
 536         rarp_ptr = (unsigned char *) (rarp + 1);
 537
 538         /* One reply at a time, please. */
 539         spin_lock(&ic_recv_lock);
 540
 541         /* If we already have a reply, just drop the packet */
 542         if (ic_got_reply)
 543                 goto drop_unlock;
 544
 545         /* Find the ic_device that the packet arrived on */
 546         d = ic_first_dev;
 547         while (d && d->dev != dev)
 548                 d = d->next;
 549         if (!d)
 550                 goto drop_unlock;       /* should never happen */
 551
 552         /* Extract variable-width fields */
 553         rarp_ptr += dev->addr_len;
 554         memcpy(&sip, rarp_ptr, 4);
 555         rarp_ptr += 4;
 556         tha = rarp_ptr;
 557         rarp_ptr += dev->addr_len;
 558         memcpy(&tip, rarp_ptr, 4);
 559
 560         /* Discard packets which are not meant for us. */
 561         if (memcmp(tha, dev->dev_addr, dev->addr_len))
 562                 goto drop_unlock;
 563
 564         /* Discard packets which are not from specified server. */
 565         if (ic_servaddr != NONE && ic_servaddr != sip)
 566                 goto drop_unlock;
 567
 568         /* We have a winner! */
 569         ic_dev = dev;
 570         if (ic_myaddr == NONE)
 571                 ic_myaddr = tip;
 572         ic_servaddr = sip;
 573         ic_addrservaddr = sip;
 574         ic_got_reply = IC_RARP;
 575
 576 drop_unlock:
 577         /* Show's over.  Nothing to see here.  */
 578         spin_unlock(&ic_recv_lock);
 579
 580 drop:
 581         /* Throw the packet out. */
 582         kfree_skb(skb);
 583         return 0;
 584 }
 585
 586
 587 /*
 588  *  Send RARP request packet over a single interface.
 589  */
 590 static void __init ic_rarp_send_if(struct ic_device *d)
 591 {
 592         struct net_device *dev = d->dev;
 593         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
 594                  dev->dev_addr, dev->dev_addr);
 595 }
 596 #endif
 597
 598 /*
 599  *  Predefine Nameservers
 600  */
 601 static inline void __init ic_nameservers_predef(void)
 602 {
 603         int i;
 604
 605         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
 606                 ic_nameservers[i] = NONE;
 607 }
 608
 609 /*
 610  *      DHCP/BOOTP support.
 611  */
 612
 613 #ifdef IPCONFIG_BOOTP
 614
 615 struct bootp_pkt {              /* BOOTP packet format */
 616         struct iphdr iph;       /* IP header */
 617         struct udphdr udph;     /* UDP header */
 618         u8 op;                  /* 1=request, 2=reply */
 619         u8 htype;               /* HW address type */
 620         u8 hlen;                /* HW address length */
 621         u8 hops;                /* Used only by gateways */
 622         __be32 xid;             /* Transaction ID */
 623         __be16 secs;            /* Seconds since we started */
 624         __be16 flags;           /* Just what it says */
 625         __be32 client_ip;               /* Client's IP address if known */
 626         __be32 your_ip;         /* Assigned IP address */
 627         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
 628         __be32 relay_ip;                /* IP address of BOOTP relay */
 629         u8 hw_addr[16];         /* Client's HW address */
 630         u8 serv_name[64];       /* Server host name */
 631         u8 boot_file[128];      /* Name of boot file */
 632         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
 633 };
 634
 635 /* packet ops */
 636 #define BOOTP_REQUEST   1
 637 #define BOOTP_REPLY     2
 638
 639 /* DHCP message types */
 640 #define DHCPDISCOVER    1
 641 #define DHCPOFFER       2
 642 #define DHCPREQUEST     3
 643 #define DHCPDECLINE     4
 644 #define DHCPACK         5
 645 #define DHCPNAK         6
 646 #define DHCPRELEASE     7
 647 #define DHCPINFORM      8
 648
 649 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 650
 651 static struct packet_type bootp_packet_type __initdata = {
 652         .type = cpu_to_be16(ETH_P_IP),
 653         .func = ic_bootp_recv,
 654 };
 655
 656 static __be32 ic_dev_xid;               /* Device under configuration */
 657
 658 /*
 659  *  Initialize DHCP/BOOTP extension fields in the request.
 660  */
 661
 662 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
 663
 664 #ifdef IPCONFIG_DHCP
 665
 666 static void __init
 667 ic_dhcp_init_options(u8 *options)
 668 {
 669         u8 mt = ((ic_servaddr == NONE)
 670                  ? DHCPDISCOVER : DHCPREQUEST);
 671         u8 *e = options;
 672         int len;
 673
 674         pr_debug("DHCP: Sending message type %d\n", mt);
 675
 676         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 677         e += 4;
 678
 679         *e++ = 53;              /* DHCP message type */
 680         *e++ = 1;
 681         *e++ = mt;
 682
 683         if (mt == DHCPREQUEST) {
 684                 *e++ = 54;      /* Server ID (IP address) */
 685                 *e++ = 4;
 686                 memcpy(e, &ic_servaddr, 4);
 687                 e += 4;
 688
 689                 *e++ = 50;      /* Requested IP address */
 690                 *e++ = 4;
 691                 memcpy(e, &ic_myaddr, 4);
 692                 e += 4;
 693         }
 694
 695         /* always? */
 696         {
 697                 static const u8 ic_req_params[] = {
 698                         1,      /* Subnet mask */
 699                         3,      /* Default gateway */
 700                         6,      /* DNS server */
 701                         12,     /* Host name */
 702                         15,     /* Domain name */
 703                         17,     /* Boot path */
 704                         26,     /* MTU */
 705                         40,     /* NIS domain name */
 706                 };
 707
 708                 *e++ = 55;      /* Parameter request list */
 709                 *e++ = sizeof(ic_req_params);
 710                 memcpy(e, ic_req_params, sizeof(ic_req_params));
 711                 e += sizeof(ic_req_params);
 712
 713                 if (ic_host_name_set) {
 714                         *e++ = 12;      /* host-name */
 715                         len = strlen(utsname()->nodename);
 716                         *e++ = len;
 717                         memcpy(e, utsname()->nodename, len);
 718                         e += len;
 719                 }
 720                 if (*vendor_class_identifier) {
 721                         pr_info("DHCP: sending class identifier \"%s\"\n",
 722                                 vendor_class_identifier);
 723                         *e++ = 60;      /* Class-identifier */
 724                         len = strlen(vendor_class_identifier);
 725                         *e++ = len;
 726                         memcpy(e, vendor_class_identifier, len);
 727                         e += len;
 728                 }
 729                 len = strlen(dhcp_client_identifier + 1);
 730                 /* the minimum length of identifier is 2, include 1 byte type,
 731                  * and can not be larger than the length of options
 732                  */
 733                 if (len >= 1 && len < 312 - (e - options) - 1) {
 734                         *e++ = 61;
 735                         *e++ = len + 1;
 736                         memcpy(e, dhcp_client_identifier, len + 1);
 737                         e += len + 1;
 738                 }
 739         }
 740
 741         *e++ = 255;     /* End of the list */
 742 }
 743
 744 #endif /* IPCONFIG_DHCP */
 745
 746 static void __init ic_bootp_init_ext(u8 *e)
 747 {
 748         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 749         e += 4;
 750         *e++ = 1;               /* Subnet mask request */
 751         *e++ = 4;
 752         e += 4;
 753         *e++ = 3;               /* Default gateway request */
 754         *e++ = 4;
 755         e += 4;
 756         *e++ = 5;               /* Name server request */
 757         *e++ = 8;
 758         e += 8;
 759         *e++ = 12;              /* Host name request */
 760         *e++ = 32;
 761         e += 32;
 762         *e++ = 40;              /* NIS Domain name request */
 763         *e++ = 32;
 764         e += 32;
 765         *e++ = 17;              /* Boot path */
 766         *e++ = 40;
 767         e += 40;
 768
 769         *e++ = 57;              /* set extension buffer size for reply */
 770         *e++ = 2;
 771         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
 772         *e++ = 150;
 773
 774         *e++ = 255;             /* End of the list */
 775 }
 776
 777
 778 /*
 779  *  Initialize the DHCP/BOOTP mechanism.
 780  */
 781 static inline void __init ic_bootp_init(void)
 782 {
 783         ic_nameservers_predef();
 784
 785         dev_add_pack(&bootp_packet_type);
 786 }
 787
 788
 789 /*
 790  *  DHCP/BOOTP cleanup.
 791  */
 792 static inline void __init ic_bootp_cleanup(void)
 793 {
 794         dev_remove_pack(&bootp_packet_type);
 795 }
 796
 797
 798 /*
 799  *  Send DHCP/BOOTP request to single interface.
 800  */
 801 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
 802 {
 803         struct net_device *dev = d->dev;
 804         struct sk_buff *skb;
 805         struct bootp_pkt *b;
 806         struct iphdr *h;
 807         int hlen = LL_RESERVED_SPACE(dev);
 808         int tlen = dev->needed_tailroom;
 809
 810         /* Allocate packet */
 811         skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
 812                         GFP_KERNEL);
 813         if (!skb)
 814                 return;
 815         skb_reserve(skb, hlen);
 816         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
 817         memset(b, 0, sizeof(struct bootp_pkt));
 818
 819         /* Construct IP header */
 820         skb_reset_network_header(skb);
 821         h = ip_hdr(skb);
 822         h->version = 4;
 823         h->ihl = 5;
 824         h->tot_len = htons(sizeof(struct bootp_pkt));
 825         h->frag_off = htons(IP_DF);
 826         h->ttl = 64;
 827         h->protocol = IPPROTO_UDP;
 828         h->daddr = htonl(INADDR_BROADCAST);
 829         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
 830
 831         /* Construct UDP header */
 832         b->udph.source = htons(68);
 833         b->udph.dest = htons(67);
 834         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
 835         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
 836
 837         /* Construct DHCP/BOOTP header */
 838         b->op = BOOTP_REQUEST;
 839         if (dev->type < 256) /* check for false types */
 840                 b->htype = dev->type;
 841         else if (dev->type == ARPHRD_FDDI)
 842                 b->htype = ARPHRD_ETHER;
 843         else {
 844                 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type,
 845                         dev->name);
 846                 b->htype = dev->type; /* can cause undefined behavior */
 847         }
 848
 849         /* server_ip and your_ip address are both already zero per RFC2131 */
 850         b->hlen = dev->addr_len;
 851         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
 852         b->secs = htons(jiffies_diff / HZ);
 853         b->xid = d->xid;
 854
 855         /* add DHCP options or BOOTP extensions */
 856 #ifdef IPCONFIG_DHCP
 857         if (ic_proto_enabled & IC_USE_DHCP)
 858                 ic_dhcp_init_options(b->exten);
 859         else
 860 #endif
 861                 ic_bootp_init_ext(b->exten);
 862
 863         /* Chain packet down the line... */
 864         skb->dev = dev;
 865         skb->protocol = htons(ETH_P_IP);
 866         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
 867                             dev->broadcast, dev->dev_addr, skb->len) < 0) {
 868                 kfree_skb(skb);
 869                 printk("E");
 870                 return;
 871         }
 872
 873         if (dev_queue_xmit(skb) < 0)
 874                 printk("E");
 875 }
 876
 877
 878 /*
 879  *  Copy BOOTP-supplied string if not already set.
 880  */
 881 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
 882 {
 883         if (!len)
 884                 return 0;
 885         if (len > max-1)
 886                 len = max-1;
 887         memcpy(dest, src, len);
 888         dest[len] = '\0';
 889         return 1;
 890 }
 891
 892
 893 /*
 894  *  Process BOOTP extensions.
 895  */
 896 static void __init ic_do_bootp_ext(u8 *ext)
 897 {
 898         u8 servers;
 899         int i;
 900         __be16 mtu;
 901
 902         u8 *c;
 903
 904         pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
 905         for (c=ext+2; c<ext+2+ext[1]; c++)
 906                 pr_debug(" %02x", *c);
 907         pr_debug("\n");
 908
 909         switch (*ext++) {
 910         case 1:         /* Subnet mask */
 911                 if (ic_netmask == NONE)
 912                         memcpy(&ic_netmask, ext+1, 4);
 913                 break;
 914         case 3:         /* Default gateway */
 915                 if (ic_gateway == NONE)
 916                         memcpy(&ic_gateway, ext+1, 4);
 917                 break;
 918         case 6:         /* DNS server */
 919                 servers= *ext/4;
 920                 if (servers > CONF_NAMESERVERS_MAX)
 921                         servers = CONF_NAMESERVERS_MAX;
 922                 for (i = 0; i < servers; i++) {
 923                         if (ic_nameservers[i] == NONE)
 924                                 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
 925                 }
 926                 break;
 927         case 12:        /* Host name */
 928                 ic_bootp_string(utsname()->nodename, ext+1, *ext,
 929                                 __NEW_UTS_LEN);
 930                 ic_host_name_set = 1;
 931                 break;
 932         case 15:        /* Domain name (DNS) */
 933                 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
 934                 break;
 935         case 17:        /* Root path */
 936                 if (!root_server_path[0])
 937                         ic_bootp_string(root_server_path, ext+1, *ext,
 938                                         sizeof(root_server_path));
 939                 break;
 940         case 26:        /* Interface MTU */
 941                 memcpy(&mtu, ext+1, sizeof(mtu));
 942                 ic_dev_mtu = ntohs(mtu);
 943                 break;
 944         case 40:        /* NIS Domain name (_not_ DNS) */
 945                 ic_bootp_string(utsname()->domainname, ext+1, *ext,
 946                                 __NEW_UTS_LEN);
 947                 break;
 948         }
 949 }
 950
 951
 952 /*
 953  *  Receive BOOTP reply.
 954  */
 955 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 956 {
 957         struct bootp_pkt *b;
 958         struct iphdr *h;
 959         struct ic_device *d;
 960         int len, ext_len;
 961
 962         if (!net_eq(dev_net(dev), &init_net))
 963                 goto drop;
 964
 965         /* Perform verifications before taking the lock.  */
 966         if (skb->pkt_type == PACKET_OTHERHOST)
 967                 goto drop;
 968
 969         skb = skb_share_check(skb, GFP_ATOMIC);
 970         if (!skb)
 971                 return NET_RX_DROP;
 972
 973         if (!pskb_may_pull(skb,
 974                            sizeof(struct iphdr) +
 975                            sizeof(struct udphdr)))
 976                 goto drop;
 977
 978         b = (struct bootp_pkt *)skb_network_header(skb);
 979         h = &b->iph;
 980
 981         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
 982                 goto drop;
 983
 984         /* Fragments are not supported */
 985         if (ip_is_fragment(h)) {
 986                 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
 987                 goto drop;
 988         }
 989
 990         if (skb->len < ntohs(h->tot_len))
 991                 goto drop;
 992
 993         if (ip_fast_csum((char *) h, h->ihl))
 994                 goto drop;
 995
 996         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
 997                 goto drop;
 998
 999         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
1000                 goto drop;
1001
1002         len = ntohs(b->udph.len) - sizeof(struct udphdr);
1003         ext_len = len - (sizeof(*b) -
1004                          sizeof(struct iphdr) -
1005                          sizeof(struct udphdr) -
1006                          sizeof(b->exten));
1007         if (ext_len < 0)
1008                 goto drop;
1009
1010         /* Ok the front looks good, make sure we can get at the rest.  */
1011         if (!pskb_may_pull(skb, skb->len))
1012                 goto drop;
1013
1014         b = (struct bootp_pkt *)skb_network_header(skb);
1015         h = &b->iph;
1016
1017         /* One reply at a time, please. */
1018         spin_lock(&ic_recv_lock);
1019
1020         /* If we already have a reply, just drop the packet */
1021         if (ic_got_reply)
1022                 goto drop_unlock;
1023
1024         /* Find the ic_device that the packet arrived on */
1025         d = ic_first_dev;
1026         while (d && d->dev != dev)
1027                 d = d->next;
1028         if (!d)
1029                 goto drop_unlock;  /* should never happen */
1030
1031         /* Is it a reply to our BOOTP request? */
1032         if (b->op != BOOTP_REPLY ||
1033             b->xid != d->xid) {
1034                 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1035                                     b->op, b->xid);
1036                 goto drop_unlock;
1037         }
1038
1039         /* Is it a reply for the device we are configuring? */
1040         if (b->xid != ic_dev_xid) {
1041                 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1042                 goto drop_unlock;
1043         }
1044
1045         /* Parse extensions */
1046         if (ext_len >= 4 &&
1047             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1048                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1049                 u8 *ext;
1050
1051 #ifdef IPCONFIG_DHCP
1052                 if (ic_proto_enabled & IC_USE_DHCP) {
1053                         __be32 server_id = NONE;
1054                         int mt = 0;
1055
1056                         ext = &b->exten[4];
1057                         while (ext < end && *ext != 0xff) {
1058                                 u8 *opt = ext++;
1059                                 if (*opt == 0)  /* Padding */
1060                                         continue;
1061                                 ext += *ext + 1;
1062                                 if (ext >= end)
1063                                         break;
1064                                 switch (*opt) {
1065                                 case 53:        /* Message type */
1066                                         if (opt[1])
1067                                                 mt = opt[2];
1068                                         break;
1069                                 case 54:        /* Server ID (IP address) */
1070                                         if (opt[1] >= 4)
1071                                                 memcpy(&server_id, opt + 2, 4);
1072                                         break;
1073                                 }
1074                         }
1075
1076                         pr_debug("DHCP: Got message type %d\n", mt);
1077
1078                         switch (mt) {
1079                         case DHCPOFFER:
1080                                 /* While in the process of accepting one offer,
1081                                  * ignore all others.
1082                                  */
1083                                 if (ic_myaddr != NONE)
1084                                         goto drop_unlock;
1085
1086                                 /* Let's accept that offer. */
1087                                 ic_myaddr = b->your_ip;
1088                                 ic_servaddr = server_id;
1089                                 pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
1090                                          &ic_myaddr, &b->iph.saddr);
1091                                 /* The DHCP indicated server address takes
1092                                  * precedence over the bootp header one if
1093                                  * they are different.
1094                                  */
1095                                 if ((server_id != NONE) &&
1096                                     (b->server_ip != server_id))
1097                                         b->server_ip = ic_servaddr;
1098                                 break;
1099
1100                         case DHCPACK:
1101                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1102                                         goto drop_unlock;
1103
1104                                 /* Yeah! */
1105                                 break;
1106
1107                         default:
1108                                 /* Urque.  Forget it*/
1109                                 ic_myaddr = NONE;
1110                                 ic_servaddr = NONE;
1111                                 goto drop_unlock;
1112                         }
1113
1114                         ic_dhcp_msgtype = mt;
1115
1116                 }
1117 #endif /* IPCONFIG_DHCP */
1118
1119                 ext = &b->exten[4];
1120                 while (ext < end && *ext != 0xff) {
1121                         u8 *opt = ext++;
1122                         if (*opt == 0)  /* Padding */
1123                                 continue;
1124                         ext += *ext + 1;
1125                         if (ext < end)
1126                                 ic_do_bootp_ext(opt);
1127                 }
1128         }
1129
1130         /* We have a winner! */
1131         ic_dev = dev;
1132         ic_myaddr = b->your_ip;
1133         ic_servaddr = b->server_ip;
1134         ic_addrservaddr = b->iph.saddr;
1135         if (ic_gateway == NONE && b->relay_ip)
1136                 ic_gateway = b->relay_ip;
1137         if (ic_nameservers[0] == NONE)
1138                 ic_nameservers[0] = ic_servaddr;
1139         ic_got_reply = IC_BOOTP;
1140
1141 drop_unlock:
1142         /* Show's over.  Nothing to see here.  */
1143         spin_unlock(&ic_recv_lock);
1144
1145 drop:
1146         /* Throw the packet out. */
1147         kfree_skb(skb);
1148
1149         return 0;
1150 }
1151
1152
1153 #endif
1154
1155
1156 /*
1157  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1158  */
1159
1160 #ifdef IPCONFIG_DYNAMIC
1161
1162 static int __init ic_dynamic(void)
1163 {
1164         int retries;
1165         struct ic_device *d;
1166         unsigned long start_jiffies, timeout, jiff;
1167         int do_bootp = ic_proto_have_if & IC_BOOTP;
1168         int do_rarp = ic_proto_have_if & IC_RARP;
1169
1170         /*
1171          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1172          * This routine gets only called when some pieces of information
1173          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1174          */
1175         if (!ic_proto_enabled) {
1176                 pr_err("IP-Config: Incomplete network configuration information\n");
1177                 return -1;
1178         }
1179
1180 #ifdef IPCONFIG_BOOTP
1181         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1182                 pr_err("DHCP/BOOTP: No suitable device found\n");
1183 #endif
1184 #ifdef IPCONFIG_RARP
1185         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1186                 pr_err("RARP: No suitable device found\n");
1187 #endif
1188
1189         if (!ic_proto_have_if)
1190                 /* Error message already printed */
1191                 return -1;
1192
1193         /*
1194          * Setup protocols
1195          */
1196 #ifdef IPCONFIG_BOOTP
1197         if (do_bootp)
1198                 ic_bootp_init();
1199 #endif
1200 #ifdef IPCONFIG_RARP
1201         if (do_rarp)
1202                 ic_rarp_init();
1203 #endif
1204
1205         /*
1206          * Send requests and wait, until we get an answer. This loop
1207          * seems to be a terrible waste of CPU time, but actually there is
1208          * only one process running at all, so we don't need to use any
1209          * scheduler functions.
1210          * [Actually we could now, but the nothing else running note still
1211          *  applies.. - AC]
1212          */
1213         pr_notice("Sending %s%s%s requests .",
1214                   do_bootp
1215                   ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1216                   (do_bootp && do_rarp) ? " and " : "",
1217                   do_rarp ? "RARP" : "");
1218
1219         start_jiffies = jiffies;
1220         d = ic_first_dev;
1221         retries = CONF_SEND_RETRIES;
1222         get_random_bytes(&timeout, sizeof(timeout));
1223         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1224         for (;;) {
1225 #ifdef IPCONFIG_BOOTP
1226                 /* Track the device we are configuring */
1227                 ic_dev_xid = d->xid;
1228
1229                 if (do_bootp && (d->able & IC_BOOTP))
1230                         ic_bootp_send_if(d, jiffies - start_jiffies);
1231 #endif
1232 #ifdef IPCONFIG_RARP
1233                 if (do_rarp && (d->able & IC_RARP))
1234                         ic_rarp_send_if(d);
1235 #endif
1236
1237                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1238                 while (time_before(jiffies, jiff) && !ic_got_reply)
1239                         schedule_timeout_uninterruptible(1);
1240 #ifdef IPCONFIG_DHCP
1241                 /* DHCP isn't done until we get a DHCPACK. */
1242                 if ((ic_got_reply & IC_BOOTP) &&
1243                     (ic_proto_enabled & IC_USE_DHCP) &&
1244                     ic_dhcp_msgtype != DHCPACK) {
1245                         ic_got_reply = 0;
1246                         pr_cont(",");
1247                         continue;
1248                 }
1249 #endif /* IPCONFIG_DHCP */
1250
1251                 if (ic_got_reply) {
1252                         pr_cont(" OK\n");
1253                         break;
1254                 }
1255
1256                 if ((d = d->next))
1257                         continue;
1258
1259                 if (! --retries) {
1260                         pr_cont(" timed out!\n");
1261                         break;
1262                 }
1263
1264                 d = ic_first_dev;
1265
1266                 timeout = timeout CONF_TIMEOUT_MULT;
1267                 if (timeout > CONF_TIMEOUT_MAX)
1268                         timeout = CONF_TIMEOUT_MAX;
1269
1270                 pr_cont(".");
1271         }
1272
1273 #ifdef IPCONFIG_BOOTP
1274         if (do_bootp)
1275                 ic_bootp_cleanup();
1276 #endif
1277 #ifdef IPCONFIG_RARP
1278         if (do_rarp)
1279                 ic_rarp_cleanup();
1280 #endif
1281
1282         if (!ic_got_reply) {
1283                 ic_myaddr = NONE;
1284                 return -1;
1285         }
1286
1287         pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
1288                 ((ic_got_reply & IC_RARP) ? "RARP"
1289                 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1290                 &ic_addrservaddr, &ic_myaddr);
1291
1292         return 0;
1293 }
1294
1295 #endif /* IPCONFIG_DYNAMIC */
1296
1297 #ifdef CONFIG_PROC_FS
1298
1299 static int pnp_seq_show(struct seq_file *seq, void *v)
1300 {
1301         int i;
1302
1303         if (ic_proto_used & IC_PROTO)
1304                 seq_printf(seq, "#PROTO: %s\n",
1305                            (ic_proto_used & IC_RARP) ? "RARP"
1306                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1307         else
1308                 seq_puts(seq, "#MANUAL\n");
1309
1310         if (ic_domain[0])
1311                 seq_printf(seq,
1312                            "domain %s\n", ic_domain);
1313         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1314                 if (ic_nameservers[i] != NONE)
1315                         seq_printf(seq, "nameserver %pI4\n",
1316                                    &ic_nameservers[i]);
1317         }
1318         if (ic_servaddr != NONE)
1319                 seq_printf(seq, "bootserver %pI4\n",
1320                            &ic_servaddr);
1321         return 0;
1322 }
1323
1324 static int pnp_seq_open(struct inode *indoe, struct file *file)
1325 {
1326         return single_open(file, pnp_seq_show, NULL);
1327 }
1328
1329 static const struct file_operations pnp_seq_fops = {
1330         .owner          = THIS_MODULE,
1331         .open           = pnp_seq_open,
1332         .read           = seq_read,
1333         .llseek         = seq_lseek,
1334         .release        = single_release,
1335 };
1336 #endif /* CONFIG_PROC_FS */
1337
1338 /*
1339  *  Extract IP address from the parameter string if needed. Note that we
1340  *  need to have root_server_addr set _before_ IPConfig gets called as it
1341  *  can override it.
1342  */
1343 __be32 __init root_nfs_parse_addr(char *name)
1344 {
1345         __be32 addr;
1346         int octets = 0;
1347         char *cp, *cq;
1348
1349         cp = cq = name;
1350         while (octets < 4) {
1351                 while (*cp >= '0' && *cp <= '9')
1352                         cp++;
1353                 if (cp == cq || cp - cq > 3)
1354                         break;
1355                 if (*cp == '.' || octets == 3)
1356                         octets++;
1357                 if (octets < 4)
1358                         cp++;
1359                 cq = cp;
1360         }
1361         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1362                 if (*cp == ':')
1363                         *cp++ = '\0';
1364                 addr = in_aton(name);
1365                 memmove(name, cp, strlen(cp) + 1);
1366         } else
1367                 addr = NONE;
1368
1369         return addr;
1370 }
1371
1372 #define DEVICE_WAIT_MAX         12 /* 12 seconds */
1373
1374 static int __init wait_for_devices(void)
1375 {
1376         int i;
1377
1378         for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1379                 struct net_device *dev;
1380                 int found = 0;
1381
1382                 rtnl_lock();
1383                 for_each_netdev(&init_net, dev) {
1384                         if (ic_is_init_dev(dev)) {
1385                                 found = 1;
1386                                 break;
1387                         }
1388                 }
1389                 rtnl_unlock();
1390                 if (found)
1391                         return 0;
1392                 ssleep(1);
1393         }
1394         return -ENODEV;
1395 }
1396
1397 /*
1398  *      IP Autoconfig dispatcher.
1399  */
1400
1401 static int __init ip_auto_config(void)
1402 {
1403         __be32 addr;
1404 #ifdef IPCONFIG_DYNAMIC
1405         int retries = CONF_OPEN_RETRIES;
1406 #endif
1407         int err;
1408         unsigned int i;
1409
1410 #ifdef CONFIG_PROC_FS
1411         proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1412 #endif /* CONFIG_PROC_FS */
1413
1414         if (!ic_enable)
1415                 return 0;
1416
1417         pr_debug("IP-Config: Entered.\n");
1418 #ifdef IPCONFIG_DYNAMIC
1419  try_try_again:
1420 #endif
1421         /* Wait for devices to appear */
1422         err = wait_for_devices();
1423         if (err)
1424                 return err;
1425
1426         /* Setup all network devices */
1427         err = ic_open_devs();
1428         if (err)
1429                 return err;
1430
1431         /* Give drivers a chance to settle */
1432         msleep(CONF_POST_OPEN);
1433
1434         /*
1435          * If the config information is insufficient (e.g., our IP address or
1436          * IP address of the boot server is missing or we have multiple network
1437          * interfaces and no default was set), use BOOTP or RARP to get the
1438          * missing values.
1439          */
1440         if (ic_myaddr == NONE ||
1441 #ifdef CONFIG_ROOT_NFS
1442             (root_server_addr == NONE &&
1443              ic_servaddr == NONE &&
1444              ROOT_DEV == Root_NFS) ||
1445 #endif
1446             ic_first_dev->next) {
1447 #ifdef IPCONFIG_DYNAMIC
1448                 if (ic_dynamic() < 0) {
1449                         ic_close_devs();
1450
1451                         /*
1452                          * I don't know why, but sometimes the
1453                          * eepro100 driver (at least) gets upset and
1454                          * doesn't work the first time it's opened.
1455                          * But then if you close it and reopen it, it
1456                          * works just fine.  So we need to try that at
1457                          * least once before giving up.
1458                          *
1459                          * Also, if the root will be NFS-mounted, we
1460                          * have nowhere to go if DHCP fails.  So we
1461                          * just have to keep trying forever.
1462                          *
1463                          *                              -- Chip
1464                          */
1465 #ifdef CONFIG_ROOT_NFS
1466                         if (ROOT_DEV ==  Root_NFS) {
1467                                 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1468                                 goto try_try_again;
1469                         }
1470 #endif
1471
1472                         if (--retries) {
1473                                 pr_err("IP-Config: Reopening network devices...\n");
1474                                 goto try_try_again;
1475                         }
1476
1477                         /* Oh, well.  At least we tried. */
1478                         pr_err("IP-Config: Auto-configuration of network failed\n");
1479                         return -1;
1480                 }
1481 #else /* !DYNAMIC */
1482                 pr_err("IP-Config: Incomplete network configuration information\n");
1483                 ic_close_devs();
1484                 return -1;
1485 #endif /* IPCONFIG_DYNAMIC */
1486         } else {
1487                 /* Device selected manually or only one device -> use it */
1488                 ic_dev = ic_first_dev->dev;
1489         }
1490
1491         addr = root_nfs_parse_addr(root_server_path);
1492         if (root_server_addr == NONE)
1493                 root_server_addr = addr;
1494
1495         /*
1496          * Use defaults wherever applicable.
1497          */
1498         if (ic_defaults() < 0)
1499                 return -1;
1500
1501         /*
1502          * Close all network devices except the device we've
1503          * autoconfigured and set up routes.
1504          */
1505         ic_close_devs();
1506         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1507                 return -1;
1508
1509         /*
1510          * Record which protocol was actually used.
1511          */
1512 #ifdef IPCONFIG_DYNAMIC
1513         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1514 #endif
1515
1516 #ifndef IPCONFIG_SILENT
1517         /*
1518          * Clue in the operator.
1519          */
1520         pr_info("IP-Config: Complete:\n");
1521
1522         pr_info("     device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1523                 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr,
1524                 &ic_myaddr, &ic_netmask, &ic_gateway);
1525         pr_info("     host=%s, domain=%s, nis-domain=%s\n",
1526                 utsname()->nodename, ic_domain, utsname()->domainname);
1527         pr_info("     bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1528                 &ic_servaddr, &root_server_addr, root_server_path);
1529         if (ic_dev_mtu)
1530                 pr_cont(", mtu=%d", ic_dev_mtu);
1531         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1532                 if (ic_nameservers[i] != NONE) {
1533                         pr_cont("     nameserver%u=%pI4",
1534                                 i, &ic_nameservers[i]);
1535                         break;
1536                 }
1537         for (i++; i < CONF_NAMESERVERS_MAX; i++)
1538                 if (ic_nameservers[i] != NONE)
1539                         pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1540         pr_cont("\n");
1541 #endif /* !SILENT */
1542
1543         return 0;
1544 }
1545
1546 late_initcall(ip_auto_config);
1547
1548
1549 /*
1550  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1551  *  command line parameter.  See Documentation/filesystems/nfs/nfsroot.txt.
1552  */
1553 static int __init ic_proto_name(char *name)
1554 {
1555         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1556                 return 1;
1557         }
1558         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1559                 return 0;
1560         }
1561 #ifdef CONFIG_IP_PNP_DHCP
1562         else if (!strncmp(name, "dhcp", 4)) {
1563                 char *client_id;
1564
1565                 ic_proto_enabled &= ~IC_RARP;
1566                 client_id = strstr(name, "dhcp,");
1567                 if (client_id) {
1568                         char *v;
1569
1570                         client_id = client_id + 5;
1571                         v = strchr(client_id, ',');
1572                         if (!v)
1573                                 return 1;
1574                         *v = 0;
1575                         if (kstrtou8(client_id, 0, dhcp_client_identifier))
1576                                 pr_debug("DHCP: Invalid client identifier type\n");
1577                         strncpy(dhcp_client_identifier + 1, v + 1, 251);
1578                         *v = ',';
1579                 }
1580                 return 1;
1581         }
1582 #endif
1583 #ifdef CONFIG_IP_PNP_BOOTP
1584         else if (!strcmp(name, "bootp")) {
1585                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1586                 return 1;
1587         }
1588 #endif
1589 #ifdef CONFIG_IP_PNP_RARP
1590         else if (!strcmp(name, "rarp")) {
1591                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1592                 return 1;
1593         }
1594 #endif
1595 #ifdef IPCONFIG_DYNAMIC
1596         else if (!strcmp(name, "both")) {
1597                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1598                 return 1;
1599         }
1600 #endif
1601         return 0;
1602 }
1603
1604 static int __init ip_auto_config_setup(char *addrs)
1605 {
1606         char *cp, *ip, *dp;
1607         int num = 0;
1608
1609         ic_set_manually = 1;
1610         ic_enable = 1;
1611
1612         /*
1613          * If any dhcp, bootp etc options are set, leave autoconfig on
1614          * and skip the below static IP processing.
1615          */
1616         if (ic_proto_name(addrs))
1617                 return 1;
1618
1619         /* If no static IP is given, turn off autoconfig and bail.  */
1620         if (*addrs == 0 ||
1621             strcmp(addrs, "off") == 0 ||
1622             strcmp(addrs, "none") == 0) {
1623                 ic_enable = 0;
1624                 return 1;
1625         }
1626
1627         ic_nameservers_predef();
1628
1629         /* Parse string for static IP assignment.  */
1630         ip = addrs;
1631         while (ip && *ip) {
1632                 if ((cp = strchr(ip, ':')))
1633                         *cp++ = '\0';
1634                 if (strlen(ip) > 0) {
1635                         pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip);
1636                         switch (num) {
1637                         case 0:
1638                                 if ((ic_myaddr = in_aton(ip)) == ANY)
1639                                         ic_myaddr = NONE;
1640                                 break;
1641                         case 1:
1642                                 if ((ic_servaddr = in_aton(ip)) == ANY)
1643                                         ic_servaddr = NONE;
1644                                 break;
1645                         case 2:
1646                                 if ((ic_gateway = in_aton(ip)) == ANY)
1647                                         ic_gateway = NONE;
1648                                 break;
1649                         case 3:
1650                                 if ((ic_netmask = in_aton(ip)) == ANY)
1651                                         ic_netmask = NONE;
1652                                 break;
1653                         case 4:
1654                                 if ((dp = strchr(ip, '.'))) {
1655                                         *dp++ = '\0';
1656                                         strlcpy(utsname()->domainname, dp,
1657                                                 sizeof(utsname()->domainname));
1658                                 }
1659                                 strlcpy(utsname()->nodename, ip,
1660                                         sizeof(utsname()->nodename));
1661                                 ic_host_name_set = 1;
1662                                 break;
1663                         case 5:
1664                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1665                                 break;
1666                         case 6:
1667                                 if (ic_proto_name(ip) == 0 &&
1668                                     ic_myaddr == NONE) {
1669                                         ic_enable = 0;
1670                                 }
1671                                 break;
1672                         case 7:
1673                                 if (CONF_NAMESERVERS_MAX >= 1) {
1674                                         ic_nameservers[0] = in_aton(ip);
1675                                         if (ic_nameservers[0] == ANY)
1676                                                 ic_nameservers[0] = NONE;
1677                                 }
1678                                 break;
1679                         case 8:
1680                                 if (CONF_NAMESERVERS_MAX >= 2) {
1681                                         ic_nameservers[1] = in_aton(ip);
1682                                         if (ic_nameservers[1] == ANY)
1683                                                 ic_nameservers[1] = NONE;
1684                                 }
1685                                 break;
1686                         }
1687                 }
1688                 ip = cp;
1689                 num++;
1690         }
1691
1692         return 1;
1693 }
1694 __setup("ip=", ip_auto_config_setup);
1695
1696 static int __init nfsaddrs_config_setup(char *addrs)
1697 {
1698         return ip_auto_config_setup(addrs);
1699 }
1700 __setup("nfsaddrs=", nfsaddrs_config_setup);
1701
1702 static int __init vendor_class_identifier_setup(char *addrs)
1703 {
1704         if (strlcpy(vendor_class_identifier, addrs,
1705                     sizeof(vendor_class_identifier))
1706             >= sizeof(vendor_class_identifier))
1707                 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
1708                         vendor_class_identifier);
1709         return 1;
1710 }
1711 __setup("dhcpclass=", vendor_class_identifier_setup);