kernel/net/ipv4/ipconfig.c

   1 /*
   2  *  Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
   3  *  user-supplied information to configure own IP address and routes.
   4  *
   5  *  Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
   6  *
   7  *  Derived from network configuration code in fs/nfs/nfsroot.c,
   8  *  originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
   9  *
  10  *  BOOTP rewritten to construct and analyse packets itself instead
  11  *  of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
  12  *                                           -- MJ, December 1998
  13  *
  14  *  Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
  15  *  initialization scheme.
  16  *      - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
  17  *
  18  *  DHCP support added.  To users this looks like a whole separate
  19  *  protocol, but we know it's just a bag on the side of BOOTP.
  20  *              -- Chip Salzenberg <chip@valinux.com>, May 2000
  21  *
  22  *  Ported DHCP support from 2.2.16 to 2.4.0-test4
  23  *              -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
  24  *
  25  *  Merged changes from 2.2.19 into 2.4.3
  26  *              -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
  27  *
  28  *  Multiple Nameservers in /proc/net/pnp
  29  *              --  Josef Siemes <jsiemes@web.de>, Aug 2002
  30  */
  31
  32 #include <linux/types.h>
  33 #include <linux/string.h>
  34 #include <linux/kernel.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/random.h>
  37 #include <linux/init.h>
  38 #include <linux/utsname.h>
  39 #include <linux/in.h>
  40 #include <linux/if.h>
  41 #include <linux/inet.h>
  42 #include <linux/inetdevice.h>
  43 #include <linux/netdevice.h>
  44 #include <linux/if_arp.h>
  45 #include <linux/skbuff.h>
  46 #include <linux/ip.h>
  47 #include <linux/socket.h>
  48 #include <linux/route.h>
  49 #include <linux/udp.h>
  50 #include <linux/proc_fs.h>
  51 #include <linux/seq_file.h>
  52 #include <linux/major.h>
  53 #include <linux/root_dev.h>
  54 #include <linux/delay.h>
  55 #include <linux/nfs_fs.h>
  56 #include <linux/slab.h>
  57 #include <linux/export.h>
  58 #include <net/net_namespace.h>
  59 #include <net/arp.h>
  60 #include <net/ip.h>
  61 #include <net/ipconfig.h>
  62 #include <net/route.h>
  63
  64 #include <asm/uaccess.h>
  65 #include <net/checksum.h>
  66 #include <asm/processor.h>
  67
  68 /* Define this to allow debugging output */
  69 #undef IPCONFIG_DEBUG
  70
  71 #ifdef IPCONFIG_DEBUG
  72 #define DBG(x) printk x
  73 #else
  74 #define DBG(x) do { } while(0)
  75 #endif
  76
  77 #if defined(CONFIG_IP_PNP_DHCP)
  78 #define IPCONFIG_DHCP
  79 #endif
  80 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
  81 #define IPCONFIG_BOOTP
  82 #endif
  83 #if defined(CONFIG_IP_PNP_RARP)
  84 #define IPCONFIG_RARP
  85 #endif
  86 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
  87 #define IPCONFIG_DYNAMIC
  88 #endif
  89
  90 /* Define the friendly delay before and after opening net devices */
  91 #define CONF_POST_OPEN          10      /* After opening: 10 msecs */
  92 #define CONF_CARRIER_TIMEOUT    120000  /* Wait for carrier timeout */
  93
  94 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
  95 #define CONF_OPEN_RETRIES       2       /* (Re)open devices twice */
  96 #define CONF_SEND_RETRIES       6       /* Send six requests per open */
  97 #define CONF_INTER_TIMEOUT      (HZ)    /* Inter-device timeout: 1 second */
  98 #define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
  99 #define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
 100 #define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
 101 #define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
 102 #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
 103                                            - '3' from resolv.h */
 104
 105 #define NONE cpu_to_be32(INADDR_NONE)
 106 #define ANY cpu_to_be32(INADDR_ANY)
 107
 108 /*
 109  * Public IP configuration
 110  */
 111
 112 /* This is used by platforms which might be able to set the ipconfig
 113  * variables using firmware environment vars.  If this is set, it will
 114  * ignore such firmware variables.
 115  */
 116 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
 117
 118 static int ic_enable __initdata;                /* IP config enabled? */
 119
 120 /* Protocol choice */
 121 int ic_proto_enabled __initdata = 0
 122 #ifdef IPCONFIG_BOOTP
 123                         | IC_BOOTP
 124 #endif
 125 #ifdef CONFIG_IP_PNP_DHCP
 126                         | IC_USE_DHCP
 127 #endif
 128 #ifdef IPCONFIG_RARP
 129                         | IC_RARP
 130 #endif
 131                         ;
 132
 133 static int ic_host_name_set __initdata; /* Host name set by us? */
 134
 135 __be32 ic_myaddr = NONE;                /* My IP address */
 136 static __be32 ic_netmask = NONE;        /* Netmask for local subnet */
 137 __be32 ic_gateway = NONE;       /* Gateway IP address */
 138
 139 __be32 ic_addrservaddr = NONE;  /* IP Address of the IP addresses'server */
 140
 141 __be32 ic_servaddr = NONE;      /* Boot server IP address */
 142
 143 __be32 root_server_addr = NONE; /* Address of NFS server */
 144 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
 145
 146 /* vendor class identifier */
 147 static char vendor_class_identifier[253] __initdata;
 148
 149 #if defined(CONFIG_IP_PNP_DHCP)
 150 static char dhcp_client_identifier[253] __initdata;
 151 #endif
 152
 153 /* Persistent data: */
 154
 155 static int ic_proto_used;                       /* Protocol used, if any */
 156 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
 157 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
 158
 159 /*
 160  * Private state.
 161  */
 162
 163 /* Name of user-selected boot device */
 164 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
 165
 166 /* Protocols supported by available interfaces */
 167 static int ic_proto_have_if __initdata;
 168
 169 /* MTU for boot device */
 170 static int ic_dev_mtu __initdata;
 171
 172 #ifdef IPCONFIG_DYNAMIC
 173 static DEFINE_SPINLOCK(ic_recv_lock);
 174 static volatile int ic_got_reply __initdata;    /* Proto(s) that replied */
 175 #endif
 176 #ifdef IPCONFIG_DHCP
 177 static int ic_dhcp_msgtype __initdata;  /* DHCP msg type received */
 178 #endif
 179
 180
 181 /*
 182  *      Network devices
 183  */
 184
 185 struct ic_device {
 186         struct ic_device *next;
 187         struct net_device *dev;
 188         unsigned short flags;
 189         short able;
 190         __be32 xid;
 191 };
 192
 193 static struct ic_device *ic_first_dev __initdata;       /* List of open device */
 194 static struct net_device *ic_dev __initdata;            /* Selected device */
 195
 196 static bool __init ic_is_init_dev(struct net_device *dev)
 197 {
 198         if (dev->flags & IFF_LOOPBACK)
 199                 return false;
 200         return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
 201             (!(dev->flags & IFF_LOOPBACK) &&
 202              (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
 203              strncmp(dev->name, "dummy", 5));
 204 }
 205
 206 static int __init ic_open_devs(void)
 207 {
 208         struct ic_device *d, **last;
 209         struct net_device *dev;
 210         unsigned short oflags;
 211         unsigned long start, next_msg;
 212
 213         last = &ic_first_dev;
 214         rtnl_lock();
 215
 216         /* bring loopback and DSA master network devices up first */
 217         for_each_netdev(&init_net, dev) {
 218                 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))
 219                         continue;
 220                 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
 221                         pr_err("IP-Config: Failed to open %s\n", dev->name);
 222         }
 223
 224         for_each_netdev(&init_net, dev) {
 225                 if (ic_is_init_dev(dev)) {
 226                         int able = 0;
 227                         if (dev->mtu >= 364)
 228                                 able |= IC_BOOTP;
 229                         else
 230                                 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small",
 231                                         dev->name, dev->mtu);
 232                         if (!(dev->flags & IFF_NOARP))
 233                                 able |= IC_RARP;
 234                         able &= ic_proto_enabled;
 235                         if (ic_proto_enabled && !able)
 236                                 continue;
 237                         oflags = dev->flags;
 238                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
 239                                 pr_err("IP-Config: Failed to open %s\n",
 240                                        dev->name);
 241                                 continue;
 242                         }
 243                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
 244                                 rtnl_unlock();
 245                                 return -ENOMEM;
 246                         }
 247                         d->dev = dev;
 248                         *last = d;
 249                         last = &d->next;
 250                         d->flags = oflags;
 251                         d->able = able;
 252                         if (able & IC_BOOTP)
 253                                 get_random_bytes(&d->xid, sizeof(__be32));
 254                         else
 255                                 d->xid = 0;
 256                         ic_proto_have_if |= able;
 257                         DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
 258                                 dev->name, able, d->xid));
 259                 }
 260         }
 261
 262         /* no point in waiting if we could not bring up at least one device */
 263         if (!ic_first_dev)
 264                 goto have_carrier;
 265
 266         /* wait for a carrier on at least one device */
 267         start = jiffies;
 268         next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
 269         while (time_before(jiffies, start +
 270                            msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) {
 271                 int wait, elapsed;
 272
 273                 for_each_netdev(&init_net, dev)
 274                         if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
 275                                 goto have_carrier;
 276
 277                 msleep(1);
 278
 279                 if (time_before(jiffies, next_msg))
 280                         continue;
 281
 282                 elapsed = jiffies_to_msecs(jiffies - start);
 283                 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
 284                 pr_info("Waiting up to %d more seconds for network.\n", wait);
 285                 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
 286         }
 287 have_carrier:
 288         rtnl_unlock();
 289
 290         *last = NULL;
 291
 292         if (!ic_first_dev) {
 293                 if (user_dev_name[0])
 294                         pr_err("IP-Config: Device `%s' not found\n",
 295                                user_dev_name);
 296                 else
 297                         pr_err("IP-Config: No network devices available\n");
 298                 return -ENODEV;
 299         }
 300         return 0;
 301 }
 302
 303 static void __init ic_close_devs(void)
 304 {
 305         struct ic_device *d, *next;
 306         struct net_device *dev;
 307
 308         rtnl_lock();
 309         next = ic_first_dev;
 310         while ((d = next)) {
 311                 next = d->next;
 312                 dev = d->dev;
 313                 if (dev != ic_dev && !netdev_uses_dsa(dev)) {
 314                         DBG(("IP-Config: Downing %s\n", dev->name));
 315                         dev_change_flags(dev, d->flags);
 316                 }
 317                 kfree(d);
 318         }
 319         rtnl_unlock();
 320 }
 321
 322 /*
 323  *      Interface to various network functions.
 324  */
 325
 326 static inline void
 327 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
 328 {
 329         sin->sin_family = AF_INET;
 330         sin->sin_addr.s_addr = addr;
 331         sin->sin_port = port;
 332 }
 333
 334 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
 335 {
 336         int res;
 337
 338         mm_segment_t oldfs = get_fs();
 339         set_fs(get_ds());
 340         res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
 341         set_fs(oldfs);
 342         return res;
 343 }
 344
 345 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
 346 {
 347         int res;
 348
 349         mm_segment_t oldfs = get_fs();
 350         set_fs(get_ds());
 351         res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
 352         set_fs(oldfs);
 353         return res;
 354 }
 355
 356 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
 357 {
 358         int res;
 359
 360         mm_segment_t oldfs = get_fs();
 361         set_fs(get_ds());
 362         res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
 363         set_fs(oldfs);
 364         return res;
 365 }
 366
 367 /*
 368  *      Set up interface addresses and routes.
 369  */
 370
 371 static int __init ic_setup_if(void)
 372 {
 373         struct ifreq ir;
 374         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
 375         int err;
 376
 377         memset(&ir, 0, sizeof(ir));
 378         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
 379         set_sockaddr(sin, ic_myaddr, 0);
 380         if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
 381                 pr_err("IP-Config: Unable to set interface address (%d)\n",
 382                        err);
 383                 return -1;
 384         }
 385         set_sockaddr(sin, ic_netmask, 0);
 386         if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
 387                 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
 388                        err);
 389                 return -1;
 390         }
 391         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
 392         if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
 393                 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
 394                        err);
 395                 return -1;
 396         }
 397         /* Handle the case where we need non-standard MTU on the boot link (a network
 398          * using jumbo frames, for instance).  If we can't set the mtu, don't error
 399          * out, we'll try to muddle along.
 400          */
 401         if (ic_dev_mtu != 0) {
 402                 strcpy(ir.ifr_name, ic_dev->name);
 403                 ir.ifr_mtu = ic_dev_mtu;
 404                 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
 405                         pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
 406                                ic_dev_mtu, err);
 407         }
 408         return 0;
 409 }
 410
 411 static int __init ic_setup_routes(void)
 412 {
 413         /* No need to setup device routes, only the default route... */
 414
 415         if (ic_gateway != NONE) {
 416                 struct rtentry rm;
 417                 int err;
 418
 419                 memset(&rm, 0, sizeof(rm));
 420                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
 421                         pr_err("IP-Config: Gateway not on directly connected network\n");
 422                         return -1;
 423                 }
 424                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
 425                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
 426                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
 427                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
 428                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
 429                         pr_err("IP-Config: Cannot add default route (%d)\n",
 430                                err);
 431                         return -1;
 432                 }
 433         }
 434
 435         return 0;
 436 }
 437
 438 /*
 439  *      Fill in default values for all missing parameters.
 440  */
 441
 442 static int __init ic_defaults(void)
 443 {
 444         /*
 445          *      At this point we have no userspace running so need not
 446          *      claim locks on system_utsname
 447          */
 448
 449         if (!ic_host_name_set)
 450                 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
 451
 452         if (root_server_addr == NONE)
 453                 root_server_addr = ic_servaddr;
 454
 455         if (ic_netmask == NONE) {
 456                 if (IN_CLASSA(ntohl(ic_myaddr)))
 457                         ic_netmask = htonl(IN_CLASSA_NET);
 458                 else if (IN_CLASSB(ntohl(ic_myaddr)))
 459                         ic_netmask = htonl(IN_CLASSB_NET);
 460                 else if (IN_CLASSC(ntohl(ic_myaddr)))
 461                         ic_netmask = htonl(IN_CLASSC_NET);
 462                 else {
 463                         pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
 464                                &ic_myaddr);
 465                         return -1;
 466                 }
 467                 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask);
 468         }
 469
 470         return 0;
 471 }
 472
 473 /*
 474  *      RARP support.
 475  */
 476
 477 #ifdef IPCONFIG_RARP
 478
 479 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 480
 481 static struct packet_type rarp_packet_type __initdata = {
 482         .type = cpu_to_be16(ETH_P_RARP),
 483         .func = ic_rarp_recv,
 484 };
 485
 486 static inline void __init ic_rarp_init(void)
 487 {
 488         dev_add_pack(&rarp_packet_type);
 489 }
 490
 491 static inline void __init ic_rarp_cleanup(void)
 492 {
 493         dev_remove_pack(&rarp_packet_type);
 494 }
 495
 496 /*
 497  *  Process received RARP packet.
 498  */
 499 static int __init
 500 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 501 {
 502         struct arphdr *rarp;
 503         unsigned char *rarp_ptr;
 504         __be32 sip, tip;
 505         unsigned char *tha;             /* t for "target" */
 506         struct ic_device *d;
 507
 508         if (!net_eq(dev_net(dev), &init_net))
 509                 goto drop;
 510
 511         skb = skb_share_check(skb, GFP_ATOMIC);
 512         if (!skb)
 513                 return NET_RX_DROP;
 514
 515         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
 516                 goto drop;
 517
 518         /* Basic sanity checks can be done without the lock.  */
 519         rarp = (struct arphdr *)skb_transport_header(skb);
 520
 521         /* If this test doesn't pass, it's not IP, or we should
 522          * ignore it anyway.
 523          */
 524         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
 525                 goto drop;
 526
 527         /* If it's not a RARP reply, delete it. */
 528         if (rarp->ar_op != htons(ARPOP_RREPLY))
 529                 goto drop;
 530
 531         /* If it's not Ethernet, delete it. */
 532         if (rarp->ar_pro != htons(ETH_P_IP))
 533                 goto drop;
 534
 535         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
 536                 goto drop;
 537
 538         /* OK, it is all there and looks valid, process... */
 539         rarp = (struct arphdr *)skb_transport_header(skb);
 540         rarp_ptr = (unsigned char *) (rarp + 1);
 541
 542         /* One reply at a time, please. */
 543         spin_lock(&ic_recv_lock);
 544
 545         /* If we already have a reply, just drop the packet */
 546         if (ic_got_reply)
 547                 goto drop_unlock;
 548
 549         /* Find the ic_device that the packet arrived on */
 550         d = ic_first_dev;
 551         while (d && d->dev != dev)
 552                 d = d->next;
 553         if (!d)
 554                 goto drop_unlock;       /* should never happen */
 555
 556         /* Extract variable-width fields */
 557         rarp_ptr += dev->addr_len;
 558         memcpy(&sip, rarp_ptr, 4);
 559         rarp_ptr += 4;
 560         tha = rarp_ptr;
 561         rarp_ptr += dev->addr_len;
 562         memcpy(&tip, rarp_ptr, 4);
 563
 564         /* Discard packets which are not meant for us. */
 565         if (memcmp(tha, dev->dev_addr, dev->addr_len))
 566                 goto drop_unlock;
 567
 568         /* Discard packets which are not from specified server. */
 569         if (ic_servaddr != NONE && ic_servaddr != sip)
 570                 goto drop_unlock;
 571
 572         /* We have a winner! */
 573         ic_dev = dev;
 574         if (ic_myaddr == NONE)
 575                 ic_myaddr = tip;
 576         ic_servaddr = sip;
 577         ic_addrservaddr = sip;
 578         ic_got_reply = IC_RARP;
 579
 580 drop_unlock:
 581         /* Show's over.  Nothing to see here.  */
 582         spin_unlock(&ic_recv_lock);
 583
 584 drop:
 585         /* Throw the packet out. */
 586         kfree_skb(skb);
 587         return 0;
 588 }
 589
 590
 591 /*
 592  *  Send RARP request packet over a single interface.
 593  */
 594 static void __init ic_rarp_send_if(struct ic_device *d)
 595 {
 596         struct net_device *dev = d->dev;
 597         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
 598                  dev->dev_addr, dev->dev_addr);
 599 }
 600 #endif
 601
 602 /*
 603  *  Predefine Nameservers
 604  */
 605 static inline void __init ic_nameservers_predef(void)
 606 {
 607         int i;
 608
 609         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
 610                 ic_nameservers[i] = NONE;
 611 }
 612
 613 /*
 614  *      DHCP/BOOTP support.
 615  */
 616
 617 #ifdef IPCONFIG_BOOTP
 618
 619 struct bootp_pkt {              /* BOOTP packet format */
 620         struct iphdr iph;       /* IP header */
 621         struct udphdr udph;     /* UDP header */
 622         u8 op;                  /* 1=request, 2=reply */
 623         u8 htype;               /* HW address type */
 624         u8 hlen;                /* HW address length */
 625         u8 hops;                /* Used only by gateways */
 626         __be32 xid;             /* Transaction ID */
 627         __be16 secs;            /* Seconds since we started */
 628         __be16 flags;           /* Just what it says */
 629         __be32 client_ip;               /* Client's IP address if known */
 630         __be32 your_ip;         /* Assigned IP address */
 631         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
 632         __be32 relay_ip;                /* IP address of BOOTP relay */
 633         u8 hw_addr[16];         /* Client's HW address */
 634         u8 serv_name[64];       /* Server host name */
 635         u8 boot_file[128];      /* Name of boot file */
 636         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
 637 };
 638
 639 /* packet ops */
 640 #define BOOTP_REQUEST   1
 641 #define BOOTP_REPLY     2
 642
 643 /* DHCP message types */
 644 #define DHCPDISCOVER    1
 645 #define DHCPOFFER       2
 646 #define DHCPREQUEST     3
 647 #define DHCPDECLINE     4
 648 #define DHCPACK         5
 649 #define DHCPNAK         6
 650 #define DHCPRELEASE     7
 651 #define DHCPINFORM      8
 652
 653 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 654
 655 static struct packet_type bootp_packet_type __initdata = {
 656         .type = cpu_to_be16(ETH_P_IP),
 657         .func = ic_bootp_recv,
 658 };
 659
 660 static __be32 ic_dev_xid;               /* Device under configuration */
 661
 662 /*
 663  *  Initialize DHCP/BOOTP extension fields in the request.
 664  */
 665
 666 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
 667
 668 #ifdef IPCONFIG_DHCP
 669
 670 static void __init
 671 ic_dhcp_init_options(u8 *options)
 672 {
 673         u8 mt = ((ic_servaddr == NONE)
 674                  ? DHCPDISCOVER : DHCPREQUEST);
 675         u8 *e = options;
 676         int len;
 677
 678 #ifdef IPCONFIG_DEBUG
 679         printk("DHCP: Sending message type %d\n", mt);
 680 #endif
 681
 682         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 683         e += 4;
 684
 685         *e++ = 53;              /* DHCP message type */
 686         *e++ = 1;
 687         *e++ = mt;
 688
 689         if (mt == DHCPREQUEST) {
 690                 *e++ = 54;      /* Server ID (IP address) */
 691                 *e++ = 4;
 692                 memcpy(e, &ic_servaddr, 4);
 693                 e += 4;
 694
 695                 *e++ = 50;      /* Requested IP address */
 696                 *e++ = 4;
 697                 memcpy(e, &ic_myaddr, 4);
 698                 e += 4;
 699         }
 700
 701         /* always? */
 702         {
 703                 static const u8 ic_req_params[] = {
 704                         1,      /* Subnet mask */
 705                         3,      /* Default gateway */
 706                         6,      /* DNS server */
 707                         12,     /* Host name */
 708                         15,     /* Domain name */
 709                         17,     /* Boot path */
 710                         26,     /* MTU */
 711                         40,     /* NIS domain name */
 712                 };
 713
 714                 *e++ = 55;      /* Parameter request list */
 715                 *e++ = sizeof(ic_req_params);
 716                 memcpy(e, ic_req_params, sizeof(ic_req_params));
 717                 e += sizeof(ic_req_params);
 718
 719                 if (ic_host_name_set) {
 720                         *e++ = 12;      /* host-name */
 721                         len = strlen(utsname()->nodename);
 722                         *e++ = len;
 723                         memcpy(e, utsname()->nodename, len);
 724                         e += len;
 725                 }
 726                 if (*vendor_class_identifier) {
 727                         pr_info("DHCP: sending class identifier \"%s\"\n",
 728                                 vendor_class_identifier);
 729                         *e++ = 60;      /* Class-identifier */
 730                         len = strlen(vendor_class_identifier);
 731                         *e++ = len;
 732                         memcpy(e, vendor_class_identifier, len);
 733                         e += len;
 734                 }
 735                 len = strlen(dhcp_client_identifier + 1);
 736                 /* the minimum length of identifier is 2, include 1 byte type,
 737                  * and can not be larger than the length of options
 738                  */
 739                 if (len >= 1 && len < 312 - (e - options) - 1) {
 740                         *e++ = 61;
 741                         *e++ = len + 1;
 742                         memcpy(e, dhcp_client_identifier, len + 1);
 743                         e += len + 1;
 744                 }
 745         }
 746
 747         *e++ = 255;     /* End of the list */
 748 }
 749
 750 #endif /* IPCONFIG_DHCP */
 751
 752 static void __init ic_bootp_init_ext(u8 *e)
 753 {
 754         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 755         e += 4;
 756         *e++ = 1;               /* Subnet mask request */
 757         *e++ = 4;
 758         e += 4;
 759         *e++ = 3;               /* Default gateway request */
 760         *e++ = 4;
 761         e += 4;
 762         *e++ = 5;               /* Name server request */
 763         *e++ = 8;
 764         e += 8;
 765         *e++ = 12;              /* Host name request */
 766         *e++ = 32;
 767         e += 32;
 768         *e++ = 40;              /* NIS Domain name request */
 769         *e++ = 32;
 770         e += 32;
 771         *e++ = 17;              /* Boot path */
 772         *e++ = 40;
 773         e += 40;
 774
 775         *e++ = 57;              /* set extension buffer size for reply */
 776         *e++ = 2;
 777         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
 778         *e++ = 150;
 779
 780         *e++ = 255;             /* End of the list */
 781 }
 782
 783
 784 /*
 785  *  Initialize the DHCP/BOOTP mechanism.
 786  */
 787 static inline void __init ic_bootp_init(void)
 788 {
 789         ic_nameservers_predef();
 790
 791         dev_add_pack(&bootp_packet_type);
 792 }
 793
 794
 795 /*
 796  *  DHCP/BOOTP cleanup.
 797  */
 798 static inline void __init ic_bootp_cleanup(void)
 799 {
 800         dev_remove_pack(&bootp_packet_type);
 801 }
 802
 803
 804 /*
 805  *  Send DHCP/BOOTP request to single interface.
 806  */
 807 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
 808 {
 809         struct net_device *dev = d->dev;
 810         struct sk_buff *skb;
 811         struct bootp_pkt *b;
 812         struct iphdr *h;
 813         int hlen = LL_RESERVED_SPACE(dev);
 814         int tlen = dev->needed_tailroom;
 815
 816         /* Allocate packet */
 817         skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
 818                         GFP_KERNEL);
 819         if (!skb)
 820                 return;
 821         skb_reserve(skb, hlen);
 822         b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
 823         memset(b, 0, sizeof(struct bootp_pkt));
 824
 825         /* Construct IP header */
 826         skb_reset_network_header(skb);
 827         h = ip_hdr(skb);
 828         h->version = 4;
 829         h->ihl = 5;
 830         h->tot_len = htons(sizeof(struct bootp_pkt));
 831         h->frag_off = htons(IP_DF);
 832         h->ttl = 64;
 833         h->protocol = IPPROTO_UDP;
 834         h->daddr = htonl(INADDR_BROADCAST);
 835         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
 836
 837         /* Construct UDP header */
 838         b->udph.source = htons(68);
 839         b->udph.dest = htons(67);
 840         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
 841         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
 842
 843         /* Construct DHCP/BOOTP header */
 844         b->op = BOOTP_REQUEST;
 845         if (dev->type < 256) /* check for false types */
 846                 b->htype = dev->type;
 847         else if (dev->type == ARPHRD_FDDI)
 848                 b->htype = ARPHRD_ETHER;
 849         else {
 850                 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name);
 851                 b->htype = dev->type; /* can cause undefined behavior */
 852         }
 853
 854         /* server_ip and your_ip address are both already zero per RFC2131 */
 855         b->hlen = dev->addr_len;
 856         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
 857         b->secs = htons(jiffies_diff / HZ);
 858         b->xid = d->xid;
 859
 860         /* add DHCP options or BOOTP extensions */
 861 #ifdef IPCONFIG_DHCP
 862         if (ic_proto_enabled & IC_USE_DHCP)
 863                 ic_dhcp_init_options(b->exten);
 864         else
 865 #endif
 866                 ic_bootp_init_ext(b->exten);
 867
 868         /* Chain packet down the line... */
 869         skb->dev = dev;
 870         skb->protocol = htons(ETH_P_IP);
 871         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
 872                             dev->broadcast, dev->dev_addr, skb->len) < 0) {
 873                 kfree_skb(skb);
 874                 printk("E");
 875                 return;
 876         }
 877
 878         if (dev_queue_xmit(skb) < 0)
 879                 printk("E");
 880 }
 881
 882
 883 /*
 884  *  Copy BOOTP-supplied string if not already set.
 885  */
 886 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
 887 {
 888         if (!len)
 889                 return 0;
 890         if (len > max-1)
 891                 len = max-1;
 892         memcpy(dest, src, len);
 893         dest[len] = '\0';
 894         return 1;
 895 }
 896
 897
 898 /*
 899  *  Process BOOTP extensions.
 900  */
 901 static void __init ic_do_bootp_ext(u8 *ext)
 902 {
 903         u8 servers;
 904         int i;
 905         __be16 mtu;
 906
 907 #ifdef IPCONFIG_DEBUG
 908         u8 *c;
 909
 910         printk("DHCP/BOOTP: Got extension %d:",*ext);
 911         for (c=ext+2; c<ext+2+ext[1]; c++)
 912                 printk(" %02x", *c);
 913         printk("\n");
 914 #endif
 915
 916         switch (*ext++) {
 917         case 1:         /* Subnet mask */
 918                 if (ic_netmask == NONE)
 919                         memcpy(&ic_netmask, ext+1, 4);
 920                 break;
 921         case 3:         /* Default gateway */
 922                 if (ic_gateway == NONE)
 923                         memcpy(&ic_gateway, ext+1, 4);
 924                 break;
 925         case 6:         /* DNS server */
 926                 servers= *ext/4;
 927                 if (servers > CONF_NAMESERVERS_MAX)
 928                         servers = CONF_NAMESERVERS_MAX;
 929                 for (i = 0; i < servers; i++) {
 930                         if (ic_nameservers[i] == NONE)
 931                                 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
 932                 }
 933                 break;
 934         case 12:        /* Host name */
 935                 ic_bootp_string(utsname()->nodename, ext+1, *ext,
 936                                 __NEW_UTS_LEN);
 937                 ic_host_name_set = 1;
 938                 break;
 939         case 15:        /* Domain name (DNS) */
 940                 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
 941                 break;
 942         case 17:        /* Root path */
 943                 if (!root_server_path[0])
 944                         ic_bootp_string(root_server_path, ext+1, *ext,
 945                                         sizeof(root_server_path));
 946                 break;
 947         case 26:        /* Interface MTU */
 948                 memcpy(&mtu, ext+1, sizeof(mtu));
 949                 ic_dev_mtu = ntohs(mtu);
 950                 break;
 951         case 40:        /* NIS Domain name (_not_ DNS) */
 952                 ic_bootp_string(utsname()->domainname, ext+1, *ext,
 953                                 __NEW_UTS_LEN);
 954                 break;
 955         }
 956 }
 957
 958
 959 /*
 960  *  Receive BOOTP reply.
 961  */
 962 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 963 {
 964         struct bootp_pkt *b;
 965         struct iphdr *h;
 966         struct ic_device *d;
 967         int len, ext_len;
 968
 969         if (!net_eq(dev_net(dev), &init_net))
 970                 goto drop;
 971
 972         /* Perform verifications before taking the lock.  */
 973         if (skb->pkt_type == PACKET_OTHERHOST)
 974                 goto drop;
 975
 976         skb = skb_share_check(skb, GFP_ATOMIC);
 977         if (!skb)
 978                 return NET_RX_DROP;
 979
 980         if (!pskb_may_pull(skb,
 981                            sizeof(struct iphdr) +
 982                            sizeof(struct udphdr)))
 983                 goto drop;
 984
 985         b = (struct bootp_pkt *)skb_network_header(skb);
 986         h = &b->iph;
 987
 988         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
 989                 goto drop;
 990
 991         /* Fragments are not supported */
 992         if (ip_is_fragment(h)) {
 993                 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
 994                 goto drop;
 995         }
 996
 997         if (skb->len < ntohs(h->tot_len))
 998                 goto drop;
 999
1000         if (ip_fast_csum((char *) h, h->ihl))
1001                 goto drop;
1002
1003         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
1004                 goto drop;
1005
1006         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
1007                 goto drop;
1008
1009         len = ntohs(b->udph.len) - sizeof(struct udphdr);
1010         ext_len = len - (sizeof(*b) -
1011                          sizeof(struct iphdr) -
1012                          sizeof(struct udphdr) -
1013                          sizeof(b->exten));
1014         if (ext_len < 0)
1015                 goto drop;
1016
1017         /* Ok the front looks good, make sure we can get at the rest.  */
1018         if (!pskb_may_pull(skb, skb->len))
1019                 goto drop;
1020
1021         b = (struct bootp_pkt *)skb_network_header(skb);
1022         h = &b->iph;
1023
1024         /* One reply at a time, please. */
1025         spin_lock(&ic_recv_lock);
1026
1027         /* If we already have a reply, just drop the packet */
1028         if (ic_got_reply)
1029                 goto drop_unlock;
1030
1031         /* Find the ic_device that the packet arrived on */
1032         d = ic_first_dev;
1033         while (d && d->dev != dev)
1034                 d = d->next;
1035         if (!d)
1036                 goto drop_unlock;  /* should never happen */
1037
1038         /* Is it a reply to our BOOTP request? */
1039         if (b->op != BOOTP_REPLY ||
1040             b->xid != d->xid) {
1041                 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n",
1042                                     b->op, b->xid);
1043                 goto drop_unlock;
1044         }
1045
1046         /* Is it a reply for the device we are configuring? */
1047         if (b->xid != ic_dev_xid) {
1048                 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n");
1049                 goto drop_unlock;
1050         }
1051
1052         /* Parse extensions */
1053         if (ext_len >= 4 &&
1054             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1055                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1056                 u8 *ext;
1057
1058 #ifdef IPCONFIG_DHCP
1059                 if (ic_proto_enabled & IC_USE_DHCP) {
1060                         __be32 server_id = NONE;
1061                         int mt = 0;
1062
1063                         ext = &b->exten[4];
1064                         while (ext < end && *ext != 0xff) {
1065                                 u8 *opt = ext++;
1066                                 if (*opt == 0)  /* Padding */
1067                                         continue;
1068                                 ext += *ext + 1;
1069                                 if (ext >= end)
1070                                         break;
1071                                 switch (*opt) {
1072                                 case 53:        /* Message type */
1073                                         if (opt[1])
1074                                                 mt = opt[2];
1075                                         break;
1076                                 case 54:        /* Server ID (IP address) */
1077                                         if (opt[1] >= 4)
1078                                                 memcpy(&server_id, opt + 2, 4);
1079                                         break;
1080                                 }
1081                         }
1082
1083 #ifdef IPCONFIG_DEBUG
1084                         printk("DHCP: Got message type %d\n", mt);
1085 #endif
1086
1087                         switch (mt) {
1088                         case DHCPOFFER:
1089                                 /* While in the process of accepting one offer,
1090                                  * ignore all others.
1091                                  */
1092                                 if (ic_myaddr != NONE)
1093                                         goto drop_unlock;
1094
1095                                 /* Let's accept that offer. */
1096                                 ic_myaddr = b->your_ip;
1097                                 ic_servaddr = server_id;
1098 #ifdef IPCONFIG_DEBUG
1099                                 printk("DHCP: Offered address %pI4 by server %pI4\n",
1100                                        &ic_myaddr, &b->iph.saddr);
1101 #endif
1102                                 /* The DHCP indicated server address takes
1103                                  * precedence over the bootp header one if
1104                                  * they are different.
1105                                  */
1106                                 if ((server_id != NONE) &&
1107                                     (b->server_ip != server_id))
1108                                         b->server_ip = ic_servaddr;
1109                                 break;
1110
1111                         case DHCPACK:
1112                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1113                                         goto drop_unlock;
1114
1115                                 /* Yeah! */
1116                                 break;
1117
1118                         default:
1119                                 /* Urque.  Forget it*/
1120                                 ic_myaddr = NONE;
1121                                 ic_servaddr = NONE;
1122                                 goto drop_unlock;
1123                         }
1124
1125                         ic_dhcp_msgtype = mt;
1126
1127                 }
1128 #endif /* IPCONFIG_DHCP */
1129
1130                 ext = &b->exten[4];
1131                 while (ext < end && *ext != 0xff) {
1132                         u8 *opt = ext++;
1133                         if (*opt == 0)  /* Padding */
1134                                 continue;
1135                         ext += *ext + 1;
1136                         if (ext < end)
1137                                 ic_do_bootp_ext(opt);
1138                 }
1139         }
1140
1141         /* We have a winner! */
1142         ic_dev = dev;
1143         ic_myaddr = b->your_ip;
1144         ic_servaddr = b->server_ip;
1145         ic_addrservaddr = b->iph.saddr;
1146         if (ic_gateway == NONE && b->relay_ip)
1147                 ic_gateway = b->relay_ip;
1148         if (ic_nameservers[0] == NONE)
1149                 ic_nameservers[0] = ic_servaddr;
1150         ic_got_reply = IC_BOOTP;
1151
1152 drop_unlock:
1153         /* Show's over.  Nothing to see here.  */
1154         spin_unlock(&ic_recv_lock);
1155
1156 drop:
1157         /* Throw the packet out. */
1158         kfree_skb(skb);
1159
1160         return 0;
1161 }
1162
1163
1164 #endif
1165
1166
1167 /*
1168  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1169  */
1170
1171 #ifdef IPCONFIG_DYNAMIC
1172
1173 static int __init ic_dynamic(void)
1174 {
1175         int retries;
1176         struct ic_device *d;
1177         unsigned long start_jiffies, timeout, jiff;
1178         int do_bootp = ic_proto_have_if & IC_BOOTP;
1179         int do_rarp = ic_proto_have_if & IC_RARP;
1180
1181         /*
1182          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1183          * This routine gets only called when some pieces of information
1184          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1185          */
1186         if (!ic_proto_enabled) {
1187                 pr_err("IP-Config: Incomplete network configuration information\n");
1188                 return -1;
1189         }
1190
1191 #ifdef IPCONFIG_BOOTP
1192         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1193                 pr_err("DHCP/BOOTP: No suitable device found\n");
1194 #endif
1195 #ifdef IPCONFIG_RARP
1196         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1197                 pr_err("RARP: No suitable device found\n");
1198 #endif
1199
1200         if (!ic_proto_have_if)
1201                 /* Error message already printed */
1202                 return -1;
1203
1204         /*
1205          * Setup protocols
1206          */
1207 #ifdef IPCONFIG_BOOTP
1208         if (do_bootp)
1209                 ic_bootp_init();
1210 #endif
1211 #ifdef IPCONFIG_RARP
1212         if (do_rarp)
1213                 ic_rarp_init();
1214 #endif
1215
1216         /*
1217          * Send requests and wait, until we get an answer. This loop
1218          * seems to be a terrible waste of CPU time, but actually there is
1219          * only one process running at all, so we don't need to use any
1220          * scheduler functions.
1221          * [Actually we could now, but the nothing else running note still
1222          *  applies.. - AC]
1223          */
1224         pr_notice("Sending %s%s%s requests .",
1225                   do_bootp
1226                   ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1227                   (do_bootp && do_rarp) ? " and " : "",
1228                   do_rarp ? "RARP" : "");
1229
1230         start_jiffies = jiffies;
1231         d = ic_first_dev;
1232         retries = CONF_SEND_RETRIES;
1233         get_random_bytes(&timeout, sizeof(timeout));
1234         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1235         for (;;) {
1236 #ifdef IPCONFIG_BOOTP
1237                 /* Track the device we are configuring */
1238                 ic_dev_xid = d->xid;
1239
1240                 if (do_bootp && (d->able & IC_BOOTP))
1241                         ic_bootp_send_if(d, jiffies - start_jiffies);
1242 #endif
1243 #ifdef IPCONFIG_RARP
1244                 if (do_rarp && (d->able & IC_RARP))
1245                         ic_rarp_send_if(d);
1246 #endif
1247
1248                 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
1249                 while (time_before(jiffies, jiff) && !ic_got_reply)
1250                         schedule_timeout_uninterruptible(1);
1251 #ifdef IPCONFIG_DHCP
1252                 /* DHCP isn't done until we get a DHCPACK. */
1253                 if ((ic_got_reply & IC_BOOTP) &&
1254                     (ic_proto_enabled & IC_USE_DHCP) &&
1255                     ic_dhcp_msgtype != DHCPACK) {
1256                         ic_got_reply = 0;
1257                         pr_cont(",");
1258                         continue;
1259                 }
1260 #endif /* IPCONFIG_DHCP */
1261
1262                 if (ic_got_reply) {
1263                         pr_cont(" OK\n");
1264                         break;
1265                 }
1266
1267                 if ((d = d->next))
1268                         continue;
1269
1270                 if (! --retries) {
1271                         pr_cont(" timed out!\n");
1272                         break;
1273                 }
1274
1275                 d = ic_first_dev;
1276
1277                 timeout = timeout CONF_TIMEOUT_MULT;
1278                 if (timeout > CONF_TIMEOUT_MAX)
1279                         timeout = CONF_TIMEOUT_MAX;
1280
1281                 pr_cont(".");
1282         }
1283
1284 #ifdef IPCONFIG_BOOTP
1285         if (do_bootp)
1286                 ic_bootp_cleanup();
1287 #endif
1288 #ifdef IPCONFIG_RARP
1289         if (do_rarp)
1290                 ic_rarp_cleanup();
1291 #endif
1292
1293         if (!ic_got_reply) {
1294                 ic_myaddr = NONE;
1295                 return -1;
1296         }
1297
1298         printk("IP-Config: Got %s answer from %pI4, ",
1299                 ((ic_got_reply & IC_RARP) ? "RARP"
1300                  : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1301                &ic_addrservaddr);
1302         pr_cont("my address is %pI4\n", &ic_myaddr);
1303
1304         return 0;
1305 }
1306
1307 #endif /* IPCONFIG_DYNAMIC */
1308
1309 #ifdef CONFIG_PROC_FS
1310
1311 static int pnp_seq_show(struct seq_file *seq, void *v)
1312 {
1313         int i;
1314
1315         if (ic_proto_used & IC_PROTO)
1316                 seq_printf(seq, "#PROTO: %s\n",
1317                            (ic_proto_used & IC_RARP) ? "RARP"
1318                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1319         else
1320                 seq_puts(seq, "#MANUAL\n");
1321
1322         if (ic_domain[0])
1323                 seq_printf(seq,
1324                            "domain %s\n", ic_domain);
1325         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1326                 if (ic_nameservers[i] != NONE)
1327                         seq_printf(seq, "nameserver %pI4\n",
1328                                    &ic_nameservers[i]);
1329         }
1330         if (ic_servaddr != NONE)
1331                 seq_printf(seq, "bootserver %pI4\n",
1332                            &ic_servaddr);
1333         return 0;
1334 }
1335
1336 static int pnp_seq_open(struct inode *indoe, struct file *file)
1337 {
1338         return single_open(file, pnp_seq_show, NULL);
1339 }
1340
1341 static const struct file_operations pnp_seq_fops = {
1342         .owner          = THIS_MODULE,
1343         .open           = pnp_seq_open,
1344         .read           = seq_read,
1345         .llseek         = seq_lseek,
1346         .release        = single_release,
1347 };
1348 #endif /* CONFIG_PROC_FS */
1349
1350 /*
1351  *  Extract IP address from the parameter string if needed. Note that we
1352  *  need to have root_server_addr set _before_ IPConfig gets called as it
1353  *  can override it.
1354  */
1355 __be32 __init root_nfs_parse_addr(char *name)
1356 {
1357         __be32 addr;
1358         int octets = 0;
1359         char *cp, *cq;
1360
1361         cp = cq = name;
1362         while (octets < 4) {
1363                 while (*cp >= '0' && *cp <= '9')
1364                         cp++;
1365                 if (cp == cq || cp - cq > 3)
1366                         break;
1367                 if (*cp == '.' || octets == 3)
1368                         octets++;
1369                 if (octets < 4)
1370                         cp++;
1371                 cq = cp;
1372         }
1373         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1374                 if (*cp == ':')
1375                         *cp++ = '\0';
1376                 addr = in_aton(name);
1377                 memmove(name, cp, strlen(cp) + 1);
1378         } else
1379                 addr = NONE;
1380
1381         return addr;
1382 }
1383
1384 #define DEVICE_WAIT_MAX         12 /* 12 seconds */
1385
1386 static int __init wait_for_devices(void)
1387 {
1388         int i;
1389
1390         for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1391                 struct net_device *dev;
1392                 int found = 0;
1393
1394                 rtnl_lock();
1395                 for_each_netdev(&init_net, dev) {
1396                         if (ic_is_init_dev(dev)) {
1397                                 found = 1;
1398                                 break;
1399                         }
1400                 }
1401                 rtnl_unlock();
1402                 if (found)
1403                         return 0;
1404                 ssleep(1);
1405         }
1406         return -ENODEV;
1407 }
1408
1409 /*
1410  *      IP Autoconfig dispatcher.
1411  */
1412
1413 static int __init ip_auto_config(void)
1414 {
1415         __be32 addr;
1416 #ifdef IPCONFIG_DYNAMIC
1417         int retries = CONF_OPEN_RETRIES;
1418 #endif
1419         int err;
1420         unsigned int i;
1421
1422 #ifdef CONFIG_PROC_FS
1423         proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1424 #endif /* CONFIG_PROC_FS */
1425
1426         if (!ic_enable)
1427                 return 0;
1428
1429         DBG(("IP-Config: Entered.\n"));
1430 #ifdef IPCONFIG_DYNAMIC
1431  try_try_again:
1432 #endif
1433         /* Wait for devices to appear */
1434         err = wait_for_devices();
1435         if (err)
1436                 return err;
1437
1438         /* Setup all network devices */
1439         err = ic_open_devs();
1440         if (err)
1441                 return err;
1442
1443         /* Give drivers a chance to settle */
1444         msleep(CONF_POST_OPEN);
1445
1446         /*
1447          * If the config information is insufficient (e.g., our IP address or
1448          * IP address of the boot server is missing or we have multiple network
1449          * interfaces and no default was set), use BOOTP or RARP to get the
1450          * missing values.
1451          */
1452         if (ic_myaddr == NONE ||
1453 #ifdef CONFIG_ROOT_NFS
1454             (root_server_addr == NONE &&
1455              ic_servaddr == NONE &&
1456              ROOT_DEV == Root_NFS) ||
1457 #endif
1458             ic_first_dev->next) {
1459 #ifdef IPCONFIG_DYNAMIC
1460                 if (ic_dynamic() < 0) {
1461                         ic_close_devs();
1462
1463                         /*
1464                          * I don't know why, but sometimes the
1465                          * eepro100 driver (at least) gets upset and
1466                          * doesn't work the first time it's opened.
1467                          * But then if you close it and reopen it, it
1468                          * works just fine.  So we need to try that at
1469                          * least once before giving up.
1470                          *
1471                          * Also, if the root will be NFS-mounted, we
1472                          * have nowhere to go if DHCP fails.  So we
1473                          * just have to keep trying forever.
1474                          *
1475                          *                              -- Chip
1476                          */
1477 #ifdef CONFIG_ROOT_NFS
1478                         if (ROOT_DEV ==  Root_NFS) {
1479                                 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1480                                 goto try_try_again;
1481                         }
1482 #endif
1483
1484                         if (--retries) {
1485                                 pr_err("IP-Config: Reopening network devices...\n");
1486                                 goto try_try_again;
1487                         }
1488
1489                         /* Oh, well.  At least we tried. */
1490                         pr_err("IP-Config: Auto-configuration of network failed\n");
1491                         return -1;
1492                 }
1493 #else /* !DYNAMIC */
1494                 pr_err("IP-Config: Incomplete network configuration information\n");
1495                 ic_close_devs();
1496                 return -1;
1497 #endif /* IPCONFIG_DYNAMIC */
1498         } else {
1499                 /* Device selected manually or only one device -> use it */
1500                 ic_dev = ic_first_dev->dev;
1501         }
1502
1503         addr = root_nfs_parse_addr(root_server_path);
1504         if (root_server_addr == NONE)
1505                 root_server_addr = addr;
1506
1507         /*
1508          * Use defaults wherever applicable.
1509          */
1510         if (ic_defaults() < 0)
1511                 return -1;
1512
1513         /*
1514          * Close all network devices except the device we've
1515          * autoconfigured and set up routes.
1516          */
1517         ic_close_devs();
1518         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1519                 return -1;
1520
1521         /*
1522          * Record which protocol was actually used.
1523          */
1524 #ifdef IPCONFIG_DYNAMIC
1525         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1526 #endif
1527
1528 #ifndef IPCONFIG_SILENT
1529         /*
1530          * Clue in the operator.
1531          */
1532         pr_info("IP-Config: Complete:\n");
1533
1534         pr_info("     device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1535                 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr,
1536                 &ic_myaddr, &ic_netmask, &ic_gateway);
1537         pr_info("     host=%s, domain=%s, nis-domain=%s\n",
1538                 utsname()->nodename, ic_domain, utsname()->domainname);
1539         pr_info("     bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1540                 &ic_servaddr, &root_server_addr, root_server_path);
1541         if (ic_dev_mtu)
1542                 pr_cont(", mtu=%d", ic_dev_mtu);
1543         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1544                 if (ic_nameservers[i] != NONE) {
1545                         pr_info("     nameserver%u=%pI4",
1546                                 i, &ic_nameservers[i]);
1547                         break;
1548                 }
1549         for (i++; i < CONF_NAMESERVERS_MAX; i++)
1550                 if (ic_nameservers[i] != NONE)
1551                         pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1552         pr_cont("\n");
1553 #endif /* !SILENT */
1554
1555         return 0;
1556 }
1557
1558 late_initcall(ip_auto_config);
1559
1560
1561 /*
1562  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1563  *  command line parameter.  See Documentation/filesystems/nfs/nfsroot.txt.
1564  */
1565 static int __init ic_proto_name(char *name)
1566 {
1567         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1568                 return 1;
1569         }
1570         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1571                 return 0;
1572         }
1573 #ifdef CONFIG_IP_PNP_DHCP
1574         else if (!strncmp(name, "dhcp", 4)) {
1575                 char *client_id;
1576
1577                 ic_proto_enabled &= ~IC_RARP;
1578                 client_id = strstr(name, "dhcp,");
1579                 if (client_id) {
1580                         char *v;
1581
1582                         client_id = client_id + 5;
1583                         v = strchr(client_id, ',');
1584                         if (!v)
1585                                 return 1;
1586                         *v = 0;
1587                         if (kstrtou8(client_id, 0, dhcp_client_identifier))
1588                                 DBG("DHCP: Invalid client identifier type\n");
1589                         strncpy(dhcp_client_identifier + 1, v + 1, 251);
1590                         *v = ',';
1591                 }
1592                 return 1;
1593         }
1594 #endif
1595 #ifdef CONFIG_IP_PNP_BOOTP
1596         else if (!strcmp(name, "bootp")) {
1597                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1598                 return 1;
1599         }
1600 #endif
1601 #ifdef CONFIG_IP_PNP_RARP
1602         else if (!strcmp(name, "rarp")) {
1603                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1604                 return 1;
1605         }
1606 #endif
1607 #ifdef IPCONFIG_DYNAMIC
1608         else if (!strcmp(name, "both")) {
1609                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1610                 return 1;
1611         }
1612 #endif
1613         return 0;
1614 }
1615
1616 static int __init ip_auto_config_setup(char *addrs)
1617 {
1618         char *cp, *ip, *dp;
1619         int num = 0;
1620
1621         ic_set_manually = 1;
1622         ic_enable = 1;
1623
1624         /*
1625          * If any dhcp, bootp etc options are set, leave autoconfig on
1626          * and skip the below static IP processing.
1627          */
1628         if (ic_proto_name(addrs))
1629                 return 1;
1630
1631         /* If no static IP is given, turn off autoconfig and bail.  */
1632         if (*addrs == 0 ||
1633             strcmp(addrs, "off") == 0 ||
1634             strcmp(addrs, "none") == 0) {
1635                 ic_enable = 0;
1636                 return 1;
1637         }
1638
1639         ic_nameservers_predef();
1640
1641         /* Parse string for static IP assignment.  */
1642         ip = addrs;
1643         while (ip && *ip) {
1644                 if ((cp = strchr(ip, ':')))
1645                         *cp++ = '\0';
1646                 if (strlen(ip) > 0) {
1647                         DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
1648                         switch (num) {
1649                         case 0:
1650                                 if ((ic_myaddr = in_aton(ip)) == ANY)
1651                                         ic_myaddr = NONE;
1652                                 break;
1653                         case 1:
1654                                 if ((ic_servaddr = in_aton(ip)) == ANY)
1655                                         ic_servaddr = NONE;
1656                                 break;
1657                         case 2:
1658                                 if ((ic_gateway = in_aton(ip)) == ANY)
1659                                         ic_gateway = NONE;
1660                                 break;
1661                         case 3:
1662                                 if ((ic_netmask = in_aton(ip)) == ANY)
1663                                         ic_netmask = NONE;
1664                                 break;
1665                         case 4:
1666                                 if ((dp = strchr(ip, '.'))) {
1667                                         *dp++ = '\0';
1668                                         strlcpy(utsname()->domainname, dp,
1669                                                 sizeof(utsname()->domainname));
1670                                 }
1671                                 strlcpy(utsname()->nodename, ip,
1672                                         sizeof(utsname()->nodename));
1673                                 ic_host_name_set = 1;
1674                                 break;
1675                         case 5:
1676                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1677                                 break;
1678                         case 6:
1679                                 if (ic_proto_name(ip) == 0 &&
1680                                     ic_myaddr == NONE) {
1681                                         ic_enable = 0;
1682                                 }
1683                                 break;
1684                         case 7:
1685                                 if (CONF_NAMESERVERS_MAX >= 1) {
1686                                         ic_nameservers[0] = in_aton(ip);
1687                                         if (ic_nameservers[0] == ANY)
1688                                                 ic_nameservers[0] = NONE;
1689                                 }
1690                                 break;
1691                         case 8:
1692                                 if (CONF_NAMESERVERS_MAX >= 2) {
1693                                         ic_nameservers[1] = in_aton(ip);
1694                                         if (ic_nameservers[1] == ANY)
1695                                                 ic_nameservers[1] = NONE;
1696                                 }
1697                                 break;
1698                         }
1699                 }
1700                 ip = cp;
1701                 num++;
1702         }
1703
1704         return 1;
1705 }
1706 __setup("ip=", ip_auto_config_setup);
1707
1708 static int __init nfsaddrs_config_setup(char *addrs)
1709 {
1710         return ip_auto_config_setup(addrs);
1711 }
1712 __setup("nfsaddrs=", nfsaddrs_config_setup);
1713
1714 static int __init vendor_class_identifier_setup(char *addrs)
1715 {
1716         if (strlcpy(vendor_class_identifier, addrs,
1717                     sizeof(vendor_class_identifier))
1718             >= sizeof(vendor_class_identifier))
1719                 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"",
1720                         vendor_class_identifier);
1721         return 1;
1722 }
1723 __setup("dhcpclass=", vendor_class_identifier_setup);