net/ipv4/ipconfig.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
   4  *  user-supplied information to configure own IP address and routes.
   5  *
   6  *  Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
   7  *
   8  *  Derived from network configuration code in fs/nfs/nfsroot.c,
   9  *  originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
  10  *
  11  *  BOOTP rewritten to construct and analyse packets itself instead
  12  *  of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
  13  *                                           -- MJ, December 1998
  14  *
  15  *  Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
  16  *  initialization scheme.
  17  *      - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
  18  *
  19  *  DHCP support added.  To users this looks like a whole separate
  20  *  protocol, but we know it's just a bag on the side of BOOTP.
  21  *              -- Chip Salzenberg <chip@valinux.com>, May 2000
  22  *
  23  *  Ported DHCP support from 2.2.16 to 2.4.0-test4
  24  *              -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
  25  *
  26  *  Merged changes from 2.2.19 into 2.4.3
  27  *              -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
  28  *
  29  *  Multiple Nameservers in /proc/net/pnp
  30  *              --  Josef Siemes <jsiemes@web.de>, Aug 2002
  31  */
  32
  33 #include <linux/types.h>
  34 #include <linux/string.h>
  35 #include <linux/kernel.h>
  36 #include <linux/jiffies.h>
  37 #include <linux/random.h>
  38 #include <linux/init.h>
  39 #include <linux/utsname.h>
  40 #include <linux/in.h>
  41 #include <linux/if.h>
  42 #include <linux/inet.h>
  43 #include <linux/inetdevice.h>
  44 #include <linux/netdevice.h>
  45 #include <linux/if_arp.h>
  46 #include <linux/skbuff.h>
  47 #include <linux/ip.h>
  48 #include <linux/socket.h>
  49 #include <linux/route.h>
  50 #include <linux/udp.h>
  51 #include <linux/proc_fs.h>
  52 #include <linux/seq_file.h>
  53 #include <linux/major.h>
  54 #include <linux/root_dev.h>
  55 #include <linux/delay.h>
  56 #include <linux/nfs_fs.h>
  57 #include <linux/slab.h>
  58 #include <linux/export.h>
  59 #include <net/net_namespace.h>
  60 #include <net/arp.h>
  61 #include <net/dsa.h>
  62 #include <net/ip.h>
  63 #include <net/ipconfig.h>
  64 #include <net/route.h>
  65
  66 #include <linux/uaccess.h>
  67 #include <net/checksum.h>
  68 #include <asm/processor.h>
  69
  70 #if defined(CONFIG_IP_PNP_DHCP)
  71 #define IPCONFIG_DHCP
  72 #endif
  73 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
  74 #define IPCONFIG_BOOTP
  75 #endif
  76 #if defined(CONFIG_IP_PNP_RARP)
  77 #define IPCONFIG_RARP
  78 #endif
  79 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
  80 #define IPCONFIG_DYNAMIC
  81 #endif
  82
  83 /* Define the friendly delay before and after opening net devices */
  84 #define CONF_POST_OPEN          10      /* After opening: 10 msecs */
  85 #define CONF_CARRIER_TIMEOUT    120000  /* Wait for carrier timeout */
  86
  87 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
  88 #define CONF_OPEN_RETRIES       2       /* (Re)open devices twice */
  89 #define CONF_SEND_RETRIES       6       /* Send six requests per open */
  90 #define CONF_BASE_TIMEOUT       (HZ*2)  /* Initial timeout: 2 seconds */
  91 #define CONF_TIMEOUT_RANDOM     (HZ)    /* Maximum amount of randomization */
  92 #define CONF_TIMEOUT_MULT       *7/4    /* Rate of timeout growth */
  93 #define CONF_TIMEOUT_MAX        (HZ*30) /* Maximum allowed timeout */
  94 #define CONF_NAMESERVERS_MAX   3       /* Maximum number of nameservers
  95                                            - '3' from resolv.h */
  96
  97 #define NONE cpu_to_be32(INADDR_NONE)
  98 #define ANY cpu_to_be32(INADDR_ANY)
  99
 100 /*
 101  * Public IP configuration
 102  */
 103
 104 /* This is used by platforms which might be able to set the ipconfig
 105  * variables using firmware environment vars.  If this is set, it will
 106  * ignore such firmware variables.
 107  */
 108 int ic_set_manually __initdata = 0;             /* IPconfig parameters set manually */
 109
 110 static int ic_enable __initdata;                /* IP config enabled? */
 111
 112 /* Protocol choice */
 113 int ic_proto_enabled __initdata = 0
 114 #ifdef IPCONFIG_BOOTP
 115                         | IC_BOOTP
 116 #endif
 117 #ifdef CONFIG_IP_PNP_DHCP
 118                         | IC_USE_DHCP
 119 #endif
 120 #ifdef IPCONFIG_RARP
 121                         | IC_RARP
 122 #endif
 123                         ;
 124
 125 static int ic_host_name_set __initdata; /* Host name set by us? */
 126
 127 __be32 ic_myaddr = NONE;                /* My IP address */
 128 static __be32 ic_netmask = NONE;        /* Netmask for local subnet */
 129 __be32 ic_gateway = NONE;       /* Gateway IP address */
 130
 131 #ifdef IPCONFIG_DYNAMIC
 132 static __be32 ic_addrservaddr = NONE;   /* IP Address of the IP addresses'server */
 133 #endif
 134
 135 __be32 ic_servaddr = NONE;      /* Boot server IP address */
 136
 137 __be32 root_server_addr = NONE; /* Address of NFS server */
 138 u8 root_server_path[256] = { 0, };      /* Path to mount as root */
 139
 140 /* vendor class identifier */
 141 static char vendor_class_identifier[253] __initdata;
 142
 143 #if defined(CONFIG_IP_PNP_DHCP)
 144 static char dhcp_client_identifier[253] __initdata;
 145 #endif
 146
 147 /* Persistent data: */
 148
 149 #ifdef IPCONFIG_DYNAMIC
 150 static int ic_proto_used;                       /* Protocol used, if any */
 151 #else
 152 #define ic_proto_used 0
 153 #endif
 154 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
 155 static u8 ic_domain[64];                /* DNS (not NIS) domain name */
 156
 157 /*
 158  * Private state.
 159  */
 160
 161 /* Name of user-selected boot device */
 162 static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
 163
 164 /* Protocols supported by available interfaces */
 165 static int ic_proto_have_if __initdata;
 166
 167 /* MTU for boot device */
 168 static int ic_dev_mtu __initdata;
 169
 170 #ifdef IPCONFIG_DYNAMIC
 171 static DEFINE_SPINLOCK(ic_recv_lock);
 172 static volatile int ic_got_reply __initdata;    /* Proto(s) that replied */
 173 #endif
 174 #ifdef IPCONFIG_DHCP
 175 static int ic_dhcp_msgtype __initdata;  /* DHCP msg type received */
 176 #endif
 177
 178
 179 /*
 180  *      Network devices
 181  */
 182
 183 struct ic_device {
 184         struct ic_device *next;
 185         struct net_device *dev;
 186         unsigned short flags;
 187         short able;
 188         __be32 xid;
 189 };
 190
 191 static struct ic_device *ic_first_dev __initdata;       /* List of open device */
 192 static struct ic_device *ic_dev __initdata;             /* Selected device */
 193
 194 static bool __init ic_is_init_dev(struct net_device *dev)
 195 {
 196         if (dev->flags & IFF_LOOPBACK)
 197                 return false;
 198         return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
 199             (!(dev->flags & IFF_LOOPBACK) &&
 200              (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
 201              strncmp(dev->name, "dummy", 5));
 202 }
 203
 204 static int __init ic_open_devs(void)
 205 {
 206         struct ic_device *d, **last;
 207         struct net_device *dev;
 208         unsigned short oflags;
 209         unsigned long start, next_msg;
 210
 211         last = &ic_first_dev;
 212         rtnl_lock();
 213
 214         /* bring loopback and DSA master network devices up first */
 215         for_each_netdev(&init_net, dev) {
 216                 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))
 217                         continue;
 218                 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
 219                         pr_err("IP-Config: Failed to open %s\n", dev->name);
 220         }
 221
 222         for_each_netdev(&init_net, dev) {
 223                 if (ic_is_init_dev(dev)) {
 224                         int able = 0;
 225                         if (dev->mtu >= 364)
 226                                 able |= IC_BOOTP;
 227                         else
 228                                 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n",
 229                                         dev->name, dev->mtu);
 230                         if (!(dev->flags & IFF_NOARP))
 231                                 able |= IC_RARP;
 232                         able &= ic_proto_enabled;
 233                         if (ic_proto_enabled && !able)
 234                                 continue;
 235                         oflags = dev->flags;
 236                         if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
 237                                 pr_err("IP-Config: Failed to open %s\n",
 238                                        dev->name);
 239                                 continue;
 240                         }
 241                         if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
 242                                 rtnl_unlock();
 243                                 return -ENOMEM;
 244                         }
 245                         d->dev = dev;
 246                         *last = d;
 247                         last = &d->next;
 248                         d->flags = oflags;
 249                         d->able = able;
 250                         if (able & IC_BOOTP)
 251                                 get_random_bytes(&d->xid, sizeof(__be32));
 252                         else
 253                                 d->xid = 0;
 254                         ic_proto_have_if |= able;
 255                         pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n",
 256                                  dev->name, able, d->xid);
 257                 }
 258         }
 259
 260         /* no point in waiting if we could not bring up at least one device */
 261         if (!ic_first_dev)
 262                 goto have_carrier;
 263
 264         /* wait for a carrier on at least one device */
 265         start = jiffies;
 266         next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
 267         while (time_before(jiffies, start +
 268                            msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) {
 269                 int wait, elapsed;
 270
 271                 for_each_netdev(&init_net, dev)
 272                         if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
 273                                 goto have_carrier;
 274
 275                 msleep(1);
 276
 277                 if (time_before(jiffies, next_msg))
 278                         continue;
 279
 280                 elapsed = jiffies_to_msecs(jiffies - start);
 281                 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
 282                 pr_info("Waiting up to %d more seconds for network.\n", wait);
 283                 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
 284         }
 285 have_carrier:
 286         rtnl_unlock();
 287
 288         *last = NULL;
 289
 290         if (!ic_first_dev) {
 291                 if (user_dev_name[0])
 292                         pr_err("IP-Config: Device `%s' not found\n",
 293                                user_dev_name);
 294                 else
 295                         pr_err("IP-Config: No network devices available\n");
 296                 return -ENODEV;
 297         }
 298         return 0;
 299 }
 300
 301 static void __init ic_close_devs(void)
 302 {
 303         struct ic_device *d, *next;
 304         struct net_device *dev;
 305
 306         rtnl_lock();
 307         next = ic_first_dev;
 308         while ((d = next)) {
 309                 next = d->next;
 310                 dev = d->dev;
 311                 if (d != ic_dev && !netdev_uses_dsa(dev)) {
 312                         pr_debug("IP-Config: Downing %s\n", dev->name);
 313                         dev_change_flags(dev, d->flags);
 314                 }
 315                 kfree(d);
 316         }
 317         rtnl_unlock();
 318 }
 319
 320 /*
 321  *      Interface to various network functions.
 322  */
 323
 324 static inline void
 325 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
 326 {
 327         sin->sin_family = AF_INET;
 328         sin->sin_addr.s_addr = addr;
 329         sin->sin_port = port;
 330 }
 331
 332 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
 333 {
 334         int res;
 335
 336         mm_segment_t oldfs = get_fs();
 337         set_fs(get_ds());
 338         res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
 339         set_fs(oldfs);
 340         return res;
 341 }
 342
 343 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
 344 {
 345         int res;
 346
 347         mm_segment_t oldfs = get_fs();
 348         set_fs(get_ds());
 349         res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
 350         set_fs(oldfs);
 351         return res;
 352 }
 353
 354 /*
 355  *      Set up interface addresses and routes.
 356  */
 357
 358 static int __init ic_setup_if(void)
 359 {
 360         struct ifreq ir;
 361         struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
 362         int err;
 363
 364         memset(&ir, 0, sizeof(ir));
 365         strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name);
 366         set_sockaddr(sin, ic_myaddr, 0);
 367         if ((err = devinet_ioctl(&init_net, SIOCSIFADDR, &ir)) < 0) {
 368                 pr_err("IP-Config: Unable to set interface address (%d)\n",
 369                        err);
 370                 return -1;
 371         }
 372         set_sockaddr(sin, ic_netmask, 0);
 373         if ((err = devinet_ioctl(&init_net, SIOCSIFNETMASK, &ir)) < 0) {
 374                 pr_err("IP-Config: Unable to set interface netmask (%d)\n",
 375                        err);
 376                 return -1;
 377         }
 378         set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
 379         if ((err = devinet_ioctl(&init_net, SIOCSIFBRDADDR, &ir)) < 0) {
 380                 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
 381                        err);
 382                 return -1;
 383         }
 384         /* Handle the case where we need non-standard MTU on the boot link (a network
 385          * using jumbo frames, for instance).  If we can't set the mtu, don't error
 386          * out, we'll try to muddle along.
 387          */
 388         if (ic_dev_mtu != 0) {
 389                 strcpy(ir.ifr_name, ic_dev->dev->name);
 390                 ir.ifr_mtu = ic_dev_mtu;
 391                 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
 392                         pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
 393                                ic_dev_mtu, err);
 394         }
 395         return 0;
 396 }
 397
 398 static int __init ic_setup_routes(void)
 399 {
 400         /* No need to setup device routes, only the default route... */
 401
 402         if (ic_gateway != NONE) {
 403                 struct rtentry rm;
 404                 int err;
 405
 406                 memset(&rm, 0, sizeof(rm));
 407                 if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
 408                         pr_err("IP-Config: Gateway not on directly connected network\n");
 409                         return -1;
 410                 }
 411                 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
 412                 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
 413                 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
 414                 rm.rt_flags = RTF_UP | RTF_GATEWAY;
 415                 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
 416                         pr_err("IP-Config: Cannot add default route (%d)\n",
 417                                err);
 418                         return -1;
 419                 }
 420         }
 421
 422         return 0;
 423 }
 424
 425 /*
 426  *      Fill in default values for all missing parameters.
 427  */
 428
 429 static int __init ic_defaults(void)
 430 {
 431         /*
 432          *      At this point we have no userspace running so need not
 433          *      claim locks on system_utsname
 434          */
 435
 436         if (!ic_host_name_set)
 437                 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);
 438
 439         if (root_server_addr == NONE)
 440                 root_server_addr = ic_servaddr;
 441
 442         if (ic_netmask == NONE) {
 443                 if (IN_CLASSA(ntohl(ic_myaddr)))
 444                         ic_netmask = htonl(IN_CLASSA_NET);
 445                 else if (IN_CLASSB(ntohl(ic_myaddr)))
 446                         ic_netmask = htonl(IN_CLASSB_NET);
 447                 else if (IN_CLASSC(ntohl(ic_myaddr)))
 448                         ic_netmask = htonl(IN_CLASSC_NET);
 449                 else {
 450                         pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
 451                                &ic_myaddr);
 452                         return -1;
 453                 }
 454                 pr_notice("IP-Config: Guessing netmask %pI4\n",
 455                           &ic_netmask);
 456         }
 457
 458         return 0;
 459 }
 460
 461 /*
 462  *      RARP support.
 463  */
 464
 465 #ifdef IPCONFIG_RARP
 466
 467 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 468
 469 static struct packet_type rarp_packet_type __initdata = {
 470         .type = cpu_to_be16(ETH_P_RARP),
 471         .func = ic_rarp_recv,
 472 };
 473
 474 static inline void __init ic_rarp_init(void)
 475 {
 476         dev_add_pack(&rarp_packet_type);
 477 }
 478
 479 static inline void __init ic_rarp_cleanup(void)
 480 {
 481         dev_remove_pack(&rarp_packet_type);
 482 }
 483
 484 /*
 485  *  Process received RARP packet.
 486  */
 487 static int __init
 488 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 489 {
 490         struct arphdr *rarp;
 491         unsigned char *rarp_ptr;
 492         __be32 sip, tip;
 493         unsigned char *tha;             /* t for "target" */
 494         struct ic_device *d;
 495
 496         if (!net_eq(dev_net(dev), &init_net))
 497                 goto drop;
 498
 499         skb = skb_share_check(skb, GFP_ATOMIC);
 500         if (!skb)
 501                 return NET_RX_DROP;
 502
 503         if (!pskb_may_pull(skb, sizeof(struct arphdr)))
 504                 goto drop;
 505
 506         /* Basic sanity checks can be done without the lock.  */
 507         rarp = (struct arphdr *)skb_transport_header(skb);
 508
 509         /* If this test doesn't pass, it's not IP, or we should
 510          * ignore it anyway.
 511          */
 512         if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
 513                 goto drop;
 514
 515         /* If it's not a RARP reply, delete it. */
 516         if (rarp->ar_op != htons(ARPOP_RREPLY))
 517                 goto drop;
 518
 519         /* If it's not Ethernet, delete it. */
 520         if (rarp->ar_pro != htons(ETH_P_IP))
 521                 goto drop;
 522
 523         if (!pskb_may_pull(skb, arp_hdr_len(dev)))
 524                 goto drop;
 525
 526         /* OK, it is all there and looks valid, process... */
 527         rarp = (struct arphdr *)skb_transport_header(skb);
 528         rarp_ptr = (unsigned char *) (rarp + 1);
 529
 530         /* One reply at a time, please. */
 531         spin_lock(&ic_recv_lock);
 532
 533         /* If we already have a reply, just drop the packet */
 534         if (ic_got_reply)
 535                 goto drop_unlock;
 536
 537         /* Find the ic_device that the packet arrived on */
 538         d = ic_first_dev;
 539         while (d && d->dev != dev)
 540                 d = d->next;
 541         if (!d)
 542                 goto drop_unlock;       /* should never happen */
 543
 544         /* Extract variable-width fields */
 545         rarp_ptr += dev->addr_len;
 546         memcpy(&sip, rarp_ptr, 4);
 547         rarp_ptr += 4;
 548         tha = rarp_ptr;
 549         rarp_ptr += dev->addr_len;
 550         memcpy(&tip, rarp_ptr, 4);
 551
 552         /* Discard packets which are not meant for us. */
 553         if (memcmp(tha, dev->dev_addr, dev->addr_len))
 554                 goto drop_unlock;
 555
 556         /* Discard packets which are not from specified server. */
 557         if (ic_servaddr != NONE && ic_servaddr != sip)
 558                 goto drop_unlock;
 559
 560         /* We have a winner! */
 561         ic_dev = d;
 562         if (ic_myaddr == NONE)
 563                 ic_myaddr = tip;
 564         ic_servaddr = sip;
 565         ic_addrservaddr = sip;
 566         ic_got_reply = IC_RARP;
 567
 568 drop_unlock:
 569         /* Show's over.  Nothing to see here.  */
 570         spin_unlock(&ic_recv_lock);
 571
 572 drop:
 573         /* Throw the packet out. */
 574         kfree_skb(skb);
 575         return 0;
 576 }
 577
 578
 579 /*
 580  *  Send RARP request packet over a single interface.
 581  */
 582 static void __init ic_rarp_send_if(struct ic_device *d)
 583 {
 584         struct net_device *dev = d->dev;
 585         arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
 586                  dev->dev_addr, dev->dev_addr);
 587 }
 588 #endif
 589
 590 /*
 591  *  Predefine Nameservers
 592  */
 593 static inline void __init ic_nameservers_predef(void)
 594 {
 595         int i;
 596
 597         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
 598                 ic_nameservers[i] = NONE;
 599 }
 600
 601 /*
 602  *      DHCP/BOOTP support.
 603  */
 604
 605 #ifdef IPCONFIG_BOOTP
 606
 607 struct bootp_pkt {              /* BOOTP packet format */
 608         struct iphdr iph;       /* IP header */
 609         struct udphdr udph;     /* UDP header */
 610         u8 op;                  /* 1=request, 2=reply */
 611         u8 htype;               /* HW address type */
 612         u8 hlen;                /* HW address length */
 613         u8 hops;                /* Used only by gateways */
 614         __be32 xid;             /* Transaction ID */
 615         __be16 secs;            /* Seconds since we started */
 616         __be16 flags;           /* Just what it says */
 617         __be32 client_ip;               /* Client's IP address if known */
 618         __be32 your_ip;         /* Assigned IP address */
 619         __be32 server_ip;               /* (Next, e.g. NFS) Server's IP address */
 620         __be32 relay_ip;                /* IP address of BOOTP relay */
 621         u8 hw_addr[16];         /* Client's HW address */
 622         u8 serv_name[64];       /* Server host name */
 623         u8 boot_file[128];      /* Name of boot file */
 624         u8 exten[312];          /* DHCP options / BOOTP vendor extensions */
 625 };
 626
 627 /* packet ops */
 628 #define BOOTP_REQUEST   1
 629 #define BOOTP_REPLY     2
 630
 631 /* DHCP message types */
 632 #define DHCPDISCOVER    1
 633 #define DHCPOFFER       2
 634 #define DHCPREQUEST     3
 635 #define DHCPDECLINE     4
 636 #define DHCPACK         5
 637 #define DHCPNAK         6
 638 #define DHCPRELEASE     7
 639 #define DHCPINFORM      8
 640
 641 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);
 642
 643 static struct packet_type bootp_packet_type __initdata = {
 644         .type = cpu_to_be16(ETH_P_IP),
 645         .func = ic_bootp_recv,
 646 };
 647
 648 /*
 649  *  Initialize DHCP/BOOTP extension fields in the request.
 650  */
 651
 652 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
 653
 654 #ifdef IPCONFIG_DHCP
 655
 656 static void __init
 657 ic_dhcp_init_options(u8 *options, struct ic_device *d)
 658 {
 659         u8 mt = ((ic_servaddr == NONE)
 660                  ? DHCPDISCOVER : DHCPREQUEST);
 661         u8 *e = options;
 662         int len;
 663
 664         pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name);
 665
 666         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 667         e += 4;
 668
 669         *e++ = 53;              /* DHCP message type */
 670         *e++ = 1;
 671         *e++ = mt;
 672
 673         if (mt == DHCPREQUEST) {
 674                 *e++ = 54;      /* Server ID (IP address) */
 675                 *e++ = 4;
 676                 memcpy(e, &ic_servaddr, 4);
 677                 e += 4;
 678
 679                 *e++ = 50;      /* Requested IP address */
 680                 *e++ = 4;
 681                 memcpy(e, &ic_myaddr, 4);
 682                 e += 4;
 683         }
 684
 685         /* always? */
 686         {
 687                 static const u8 ic_req_params[] = {
 688                         1,      /* Subnet mask */
 689                         3,      /* Default gateway */
 690                         6,      /* DNS server */
 691                         12,     /* Host name */
 692                         15,     /* Domain name */
 693                         17,     /* Boot path */
 694                         26,     /* MTU */
 695                         40,     /* NIS domain name */
 696                 };
 697
 698                 *e++ = 55;      /* Parameter request list */
 699                 *e++ = sizeof(ic_req_params);
 700                 memcpy(e, ic_req_params, sizeof(ic_req_params));
 701                 e += sizeof(ic_req_params);
 702
 703                 if (ic_host_name_set) {
 704                         *e++ = 12;      /* host-name */
 705                         len = strlen(utsname()->nodename);
 706                         *e++ = len;
 707                         memcpy(e, utsname()->nodename, len);
 708                         e += len;
 709                 }
 710                 if (*vendor_class_identifier) {
 711                         pr_info("DHCP: sending class identifier \"%s\"\n",
 712                                 vendor_class_identifier);
 713                         *e++ = 60;      /* Class-identifier */
 714                         len = strlen(vendor_class_identifier);
 715                         *e++ = len;
 716                         memcpy(e, vendor_class_identifier, len);
 717                         e += len;
 718                 }
 719                 len = strlen(dhcp_client_identifier + 1);
 720                 /* the minimum length of identifier is 2, include 1 byte type,
 721                  * and can not be larger than the length of options
 722                  */
 723                 if (len >= 1 && len < 312 - (e - options) - 1) {
 724                         *e++ = 61;
 725                         *e++ = len + 1;
 726                         memcpy(e, dhcp_client_identifier, len + 1);
 727                         e += len + 1;
 728                 }
 729         }
 730
 731         *e++ = 255;     /* End of the list */
 732 }
 733
 734 #endif /* IPCONFIG_DHCP */
 735
 736 static void __init ic_bootp_init_ext(u8 *e)
 737 {
 738         memcpy(e, ic_bootp_cookie, 4);  /* RFC1048 Magic Cookie */
 739         e += 4;
 740         *e++ = 1;               /* Subnet mask request */
 741         *e++ = 4;
 742         e += 4;
 743         *e++ = 3;               /* Default gateway request */
 744         *e++ = 4;
 745         e += 4;
 746         *e++ = 5;               /* Name server request */
 747         *e++ = 8;
 748         e += 8;
 749         *e++ = 12;              /* Host name request */
 750         *e++ = 32;
 751         e += 32;
 752         *e++ = 40;              /* NIS Domain name request */
 753         *e++ = 32;
 754         e += 32;
 755         *e++ = 17;              /* Boot path */
 756         *e++ = 40;
 757         e += 40;
 758
 759         *e++ = 57;              /* set extension buffer size for reply */
 760         *e++ = 2;
 761         *e++ = 1;               /* 128+236+8+20+14, see dhcpd sources */
 762         *e++ = 150;
 763
 764         *e++ = 255;             /* End of the list */
 765 }
 766
 767
 768 /*
 769  *  Initialize the DHCP/BOOTP mechanism.
 770  */
 771 static inline void __init ic_bootp_init(void)
 772 {
 773         ic_nameservers_predef();
 774
 775         dev_add_pack(&bootp_packet_type);
 776 }
 777
 778
 779 /*
 780  *  DHCP/BOOTP cleanup.
 781  */
 782 static inline void __init ic_bootp_cleanup(void)
 783 {
 784         dev_remove_pack(&bootp_packet_type);
 785 }
 786
 787
 788 /*
 789  *  Send DHCP/BOOTP request to single interface.
 790  */
 791 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
 792 {
 793         struct net_device *dev = d->dev;
 794         struct sk_buff *skb;
 795         struct bootp_pkt *b;
 796         struct iphdr *h;
 797         int hlen = LL_RESERVED_SPACE(dev);
 798         int tlen = dev->needed_tailroom;
 799
 800         /* Allocate packet */
 801         skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
 802                         GFP_KERNEL);
 803         if (!skb)
 804                 return;
 805         skb_reserve(skb, hlen);
 806         b = skb_put_zero(skb, sizeof(struct bootp_pkt));
 807
 808         /* Construct IP header */
 809         skb_reset_network_header(skb);
 810         h = ip_hdr(skb);
 811         h->version = 4;
 812         h->ihl = 5;
 813         h->tot_len = htons(sizeof(struct bootp_pkt));
 814         h->frag_off = htons(IP_DF);
 815         h->ttl = 64;
 816         h->protocol = IPPROTO_UDP;
 817         h->daddr = htonl(INADDR_BROADCAST);
 818         h->check = ip_fast_csum((unsigned char *) h, h->ihl);
 819
 820         /* Construct UDP header */
 821         b->udph.source = htons(68);
 822         b->udph.dest = htons(67);
 823         b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
 824         /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
 825
 826         /* Construct DHCP/BOOTP header */
 827         b->op = BOOTP_REQUEST;
 828         if (dev->type < 256) /* check for false types */
 829                 b->htype = dev->type;
 830         else if (dev->type == ARPHRD_FDDI)
 831                 b->htype = ARPHRD_ETHER;
 832         else {
 833                 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type,
 834                         dev->name);
 835                 b->htype = dev->type; /* can cause undefined behavior */
 836         }
 837
 838         /* server_ip and your_ip address are both already zero per RFC2131 */
 839         b->hlen = dev->addr_len;
 840         memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
 841         b->secs = htons(jiffies_diff / HZ);
 842         b->xid = d->xid;
 843
 844         /* add DHCP options or BOOTP extensions */
 845 #ifdef IPCONFIG_DHCP
 846         if (ic_proto_enabled & IC_USE_DHCP)
 847                 ic_dhcp_init_options(b->exten, d);
 848         else
 849 #endif
 850                 ic_bootp_init_ext(b->exten);
 851
 852         /* Chain packet down the line... */
 853         skb->dev = dev;
 854         skb->protocol = htons(ETH_P_IP);
 855         if (dev_hard_header(skb, dev, ntohs(skb->protocol),
 856                             dev->broadcast, dev->dev_addr, skb->len) < 0) {
 857                 kfree_skb(skb);
 858                 printk("E");
 859                 return;
 860         }
 861
 862         if (dev_queue_xmit(skb) < 0)
 863                 printk("E");
 864 }
 865
 866
 867 /*
 868  *  Copy BOOTP-supplied string if not already set.
 869  */
 870 static int __init ic_bootp_string(char *dest, char *src, int len, int max)
 871 {
 872         if (!len)
 873                 return 0;
 874         if (len > max-1)
 875                 len = max-1;
 876         memcpy(dest, src, len);
 877         dest[len] = '\0';
 878         return 1;
 879 }
 880
 881
 882 /*
 883  *  Process BOOTP extensions.
 884  */
 885 static void __init ic_do_bootp_ext(u8 *ext)
 886 {
 887         u8 servers;
 888         int i;
 889         __be16 mtu;
 890
 891         u8 *c;
 892
 893         pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
 894         for (c=ext+2; c<ext+2+ext[1]; c++)
 895                 pr_debug(" %02x", *c);
 896         pr_debug("\n");
 897
 898         switch (*ext++) {
 899         case 1:         /* Subnet mask */
 900                 if (ic_netmask == NONE)
 901                         memcpy(&ic_netmask, ext+1, 4);
 902                 break;
 903         case 3:         /* Default gateway */
 904                 if (ic_gateway == NONE)
 905                         memcpy(&ic_gateway, ext+1, 4);
 906                 break;
 907         case 6:         /* DNS server */
 908                 servers= *ext/4;
 909                 if (servers > CONF_NAMESERVERS_MAX)
 910                         servers = CONF_NAMESERVERS_MAX;
 911                 for (i = 0; i < servers; i++) {
 912                         if (ic_nameservers[i] == NONE)
 913                                 memcpy(&ic_nameservers[i], ext+1+4*i, 4);
 914                 }
 915                 break;
 916         case 12:        /* Host name */
 917                 ic_bootp_string(utsname()->nodename, ext+1, *ext,
 918                                 __NEW_UTS_LEN);
 919                 ic_host_name_set = 1;
 920                 break;
 921         case 15:        /* Domain name (DNS) */
 922                 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
 923                 break;
 924         case 17:        /* Root path */
 925                 if (!root_server_path[0])
 926                         ic_bootp_string(root_server_path, ext+1, *ext,
 927                                         sizeof(root_server_path));
 928                 break;
 929         case 26:        /* Interface MTU */
 930                 memcpy(&mtu, ext+1, sizeof(mtu));
 931                 ic_dev_mtu = ntohs(mtu);
 932                 break;
 933         case 40:        /* NIS Domain name (_not_ DNS) */
 934                 ic_bootp_string(utsname()->domainname, ext+1, *ext,
 935                                 __NEW_UTS_LEN);
 936                 break;
 937         }
 938 }
 939
 940
 941 /*
 942  *  Receive BOOTP reply.
 943  */
 944 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
 945 {
 946         struct bootp_pkt *b;
 947         struct iphdr *h;
 948         struct ic_device *d;
 949         int len, ext_len;
 950
 951         if (!net_eq(dev_net(dev), &init_net))
 952                 goto drop;
 953
 954         /* Perform verifications before taking the lock.  */
 955         if (skb->pkt_type == PACKET_OTHERHOST)
 956                 goto drop;
 957
 958         skb = skb_share_check(skb, GFP_ATOMIC);
 959         if (!skb)
 960                 return NET_RX_DROP;
 961
 962         if (!pskb_may_pull(skb,
 963                            sizeof(struct iphdr) +
 964                            sizeof(struct udphdr)))
 965                 goto drop;
 966
 967         b = (struct bootp_pkt *)skb_network_header(skb);
 968         h = &b->iph;
 969
 970         if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
 971                 goto drop;
 972
 973         /* Fragments are not supported */
 974         if (ip_is_fragment(h)) {
 975                 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
 976                 goto drop;
 977         }
 978
 979         if (skb->len < ntohs(h->tot_len))
 980                 goto drop;
 981
 982         if (ip_fast_csum((char *) h, h->ihl))
 983                 goto drop;
 984
 985         if (b->udph.source != htons(67) || b->udph.dest != htons(68))
 986                 goto drop;
 987
 988         if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
 989                 goto drop;
 990
 991         len = ntohs(b->udph.len) - sizeof(struct udphdr);
 992         ext_len = len - (sizeof(*b) -
 993                          sizeof(struct iphdr) -
 994                          sizeof(struct udphdr) -
 995                          sizeof(b->exten));
 996         if (ext_len < 0)
 997                 goto drop;
 998
 999         /* Ok the front looks good, make sure we can get at the rest.  */
1000         if (!pskb_may_pull(skb, skb->len))
1001                 goto drop;
1002
1003         b = (struct bootp_pkt *)skb_network_header(skb);
1004         h = &b->iph;
1005
1006         /* One reply at a time, please. */
1007         spin_lock(&ic_recv_lock);
1008
1009         /* If we already have a reply, just drop the packet */
1010         if (ic_got_reply)
1011                 goto drop_unlock;
1012
1013         /* Find the ic_device that the packet arrived on */
1014         d = ic_first_dev;
1015         while (d && d->dev != dev)
1016                 d = d->next;
1017         if (!d)
1018                 goto drop_unlock;  /* should never happen */
1019
1020         /* Is it a reply to our BOOTP request? */
1021         if (b->op != BOOTP_REPLY ||
1022             b->xid != d->xid) {
1023                 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n",
1024                                     d->dev->name, b->op, b->xid);
1025                 goto drop_unlock;
1026         }
1027
1028         /* Parse extensions */
1029         if (ext_len >= 4 &&
1030             !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
1031                 u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
1032                 u8 *ext;
1033
1034 #ifdef IPCONFIG_DHCP
1035                 if (ic_proto_enabled & IC_USE_DHCP) {
1036                         __be32 server_id = NONE;
1037                         int mt = 0;
1038
1039                         ext = &b->exten[4];
1040                         while (ext < end && *ext != 0xff) {
1041                                 u8 *opt = ext++;
1042                                 if (*opt == 0)  /* Padding */
1043                                         continue;
1044                                 ext += *ext + 1;
1045                                 if (ext >= end)
1046                                         break;
1047                                 switch (*opt) {
1048                                 case 53:        /* Message type */
1049                                         if (opt[1])
1050                                                 mt = opt[2];
1051                                         break;
1052                                 case 54:        /* Server ID (IP address) */
1053                                         if (opt[1] >= 4)
1054                                                 memcpy(&server_id, opt + 2, 4);
1055                                         break;
1056                                 }
1057                         }
1058
1059                         pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name);
1060
1061                         switch (mt) {
1062                         case DHCPOFFER:
1063                                 /* While in the process of accepting one offer,
1064                                  * ignore all others.
1065                                  */
1066                                 if (ic_myaddr != NONE)
1067                                         goto drop_unlock;
1068
1069                                 /* Let's accept that offer. */
1070                                 ic_myaddr = b->your_ip;
1071                                 ic_servaddr = server_id;
1072                                 pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
1073                                          &ic_myaddr, &b->iph.saddr);
1074                                 /* The DHCP indicated server address takes
1075                                  * precedence over the bootp header one if
1076                                  * they are different.
1077                                  */
1078                                 if ((server_id != NONE) &&
1079                                     (b->server_ip != server_id))
1080                                         b->server_ip = ic_servaddr;
1081                                 break;
1082
1083                         case DHCPACK:
1084                                 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
1085                                         goto drop_unlock;
1086
1087                                 /* Yeah! */
1088                                 break;
1089
1090                         default:
1091                                 /* Urque.  Forget it*/
1092                                 ic_myaddr = NONE;
1093                                 ic_servaddr = NONE;
1094                                 goto drop_unlock;
1095                         }
1096
1097                         ic_dhcp_msgtype = mt;
1098
1099                 }
1100 #endif /* IPCONFIG_DHCP */
1101
1102                 ext = &b->exten[4];
1103                 while (ext < end && *ext != 0xff) {
1104                         u8 *opt = ext++;
1105                         if (*opt == 0)  /* Padding */
1106                                 continue;
1107                         ext += *ext + 1;
1108                         if (ext < end)
1109                                 ic_do_bootp_ext(opt);
1110                 }
1111         }
1112
1113         /* We have a winner! */
1114         ic_dev = d;
1115         ic_myaddr = b->your_ip;
1116         ic_servaddr = b->server_ip;
1117         ic_addrservaddr = b->iph.saddr;
1118         if (ic_gateway == NONE && b->relay_ip)
1119                 ic_gateway = b->relay_ip;
1120         if (ic_nameservers[0] == NONE)
1121                 ic_nameservers[0] = ic_servaddr;
1122         ic_got_reply = IC_BOOTP;
1123
1124 drop_unlock:
1125         /* Show's over.  Nothing to see here.  */
1126         spin_unlock(&ic_recv_lock);
1127
1128 drop:
1129         /* Throw the packet out. */
1130         kfree_skb(skb);
1131
1132         return 0;
1133 }
1134
1135
1136 #endif
1137
1138
1139 /*
1140  *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
1141  */
1142
1143 #ifdef IPCONFIG_DYNAMIC
1144
1145 static int __init ic_dynamic(void)
1146 {
1147         int retries;
1148         struct ic_device *d;
1149         unsigned long start_jiffies, timeout, jiff;
1150         int do_bootp = ic_proto_have_if & IC_BOOTP;
1151         int do_rarp = ic_proto_have_if & IC_RARP;
1152
1153         /*
1154          * If none of DHCP/BOOTP/RARP was selected, return with an error.
1155          * This routine gets only called when some pieces of information
1156          * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1157          */
1158         if (!ic_proto_enabled) {
1159                 pr_err("IP-Config: Incomplete network configuration information\n");
1160                 return -1;
1161         }
1162
1163 #ifdef IPCONFIG_BOOTP
1164         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
1165                 pr_err("DHCP/BOOTP: No suitable device found\n");
1166 #endif
1167 #ifdef IPCONFIG_RARP
1168         if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
1169                 pr_err("RARP: No suitable device found\n");
1170 #endif
1171
1172         if (!ic_proto_have_if)
1173                 /* Error message already printed */
1174                 return -1;
1175
1176         /*
1177          * Setup protocols
1178          */
1179 #ifdef IPCONFIG_BOOTP
1180         if (do_bootp)
1181                 ic_bootp_init();
1182 #endif
1183 #ifdef IPCONFIG_RARP
1184         if (do_rarp)
1185                 ic_rarp_init();
1186 #endif
1187
1188         /*
1189          * Send requests and wait, until we get an answer. This loop
1190          * seems to be a terrible waste of CPU time, but actually there is
1191          * only one process running at all, so we don't need to use any
1192          * scheduler functions.
1193          * [Actually we could now, but the nothing else running note still
1194          *  applies.. - AC]
1195          */
1196         pr_notice("Sending %s%s%s requests .",
1197                   do_bootp
1198                   ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
1199                   (do_bootp && do_rarp) ? " and " : "",
1200                   do_rarp ? "RARP" : "");
1201
1202         start_jiffies = jiffies;
1203         d = ic_first_dev;
1204         retries = CONF_SEND_RETRIES;
1205         get_random_bytes(&timeout, sizeof(timeout));
1206         timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
1207         for (;;) {
1208 #ifdef IPCONFIG_BOOTP
1209                 if (do_bootp && (d->able & IC_BOOTP))
1210                         ic_bootp_send_if(d, jiffies - start_jiffies);
1211 #endif
1212 #ifdef IPCONFIG_RARP
1213                 if (do_rarp && (d->able & IC_RARP))
1214                         ic_rarp_send_if(d);
1215 #endif
1216
1217                 if (!d->next) {
1218                         jiff = jiffies + timeout;
1219                         while (time_before(jiffies, jiff) && !ic_got_reply)
1220                                 schedule_timeout_uninterruptible(1);
1221                 }
1222 #ifdef IPCONFIG_DHCP
1223                 /* DHCP isn't done until we get a DHCPACK. */
1224                 if ((ic_got_reply & IC_BOOTP) &&
1225                     (ic_proto_enabled & IC_USE_DHCP) &&
1226                     ic_dhcp_msgtype != DHCPACK) {
1227                         ic_got_reply = 0;
1228                         /* continue on device that got the reply */
1229                         d = ic_dev;
1230                         pr_cont(",");
1231                         continue;
1232                 }
1233 #endif /* IPCONFIG_DHCP */
1234
1235                 if (ic_got_reply) {
1236                         pr_cont(" OK\n");
1237                         break;
1238                 }
1239
1240                 if ((d = d->next))
1241                         continue;
1242
1243                 if (! --retries) {
1244                         pr_cont(" timed out!\n");
1245                         break;
1246                 }
1247
1248                 d = ic_first_dev;
1249
1250                 timeout = timeout CONF_TIMEOUT_MULT;
1251                 if (timeout > CONF_TIMEOUT_MAX)
1252                         timeout = CONF_TIMEOUT_MAX;
1253
1254                 pr_cont(".");
1255         }
1256
1257 #ifdef IPCONFIG_BOOTP
1258         if (do_bootp)
1259                 ic_bootp_cleanup();
1260 #endif
1261 #ifdef IPCONFIG_RARP
1262         if (do_rarp)
1263                 ic_rarp_cleanup();
1264 #endif
1265
1266         if (!ic_got_reply) {
1267                 ic_myaddr = NONE;
1268                 return -1;
1269         }
1270
1271         pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
1272                 ((ic_got_reply & IC_RARP) ? "RARP"
1273                 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
1274                 &ic_addrservaddr, &ic_myaddr);
1275
1276         return 0;
1277 }
1278
1279 #endif /* IPCONFIG_DYNAMIC */
1280
1281 #ifdef CONFIG_PROC_FS
1282
1283 static int pnp_seq_show(struct seq_file *seq, void *v)
1284 {
1285         int i;
1286
1287         if (ic_proto_used & IC_PROTO)
1288                 seq_printf(seq, "#PROTO: %s\n",
1289                            (ic_proto_used & IC_RARP) ? "RARP"
1290                            : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
1291         else
1292                 seq_puts(seq, "#MANUAL\n");
1293
1294         if (ic_domain[0])
1295                 seq_printf(seq,
1296                            "domain %s\n", ic_domain);
1297         for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
1298                 if (ic_nameservers[i] != NONE)
1299                         seq_printf(seq, "nameserver %pI4\n",
1300                                    &ic_nameservers[i]);
1301         }
1302         if (ic_servaddr != NONE)
1303                 seq_printf(seq, "bootserver %pI4\n",
1304                            &ic_servaddr);
1305         return 0;
1306 }
1307
1308 static int pnp_seq_open(struct inode *indoe, struct file *file)
1309 {
1310         return single_open(file, pnp_seq_show, NULL);
1311 }
1312
1313 static const struct file_operations pnp_seq_fops = {
1314         .open           = pnp_seq_open,
1315         .read           = seq_read,
1316         .llseek         = seq_lseek,
1317         .release        = single_release,
1318 };
1319 #endif /* CONFIG_PROC_FS */
1320
1321 /*
1322  *  Extract IP address from the parameter string if needed. Note that we
1323  *  need to have root_server_addr set _before_ IPConfig gets called as it
1324  *  can override it.
1325  */
1326 __be32 __init root_nfs_parse_addr(char *name)
1327 {
1328         __be32 addr;
1329         int octets = 0;
1330         char *cp, *cq;
1331
1332         cp = cq = name;
1333         while (octets < 4) {
1334                 while (*cp >= '0' && *cp <= '9')
1335                         cp++;
1336                 if (cp == cq || cp - cq > 3)
1337                         break;
1338                 if (*cp == '.' || octets == 3)
1339                         octets++;
1340                 if (octets < 4)
1341                         cp++;
1342                 cq = cp;
1343         }
1344         if (octets == 4 && (*cp == ':' || *cp == '\0')) {
1345                 if (*cp == ':')
1346                         *cp++ = '\0';
1347                 addr = in_aton(name);
1348                 memmove(name, cp, strlen(cp) + 1);
1349         } else
1350                 addr = NONE;
1351
1352         return addr;
1353 }
1354
1355 #define DEVICE_WAIT_MAX         12 /* 12 seconds */
1356
1357 static int __init wait_for_devices(void)
1358 {
1359         int i;
1360
1361         for (i = 0; i < DEVICE_WAIT_MAX; i++) {
1362                 struct net_device *dev;
1363                 int found = 0;
1364
1365                 rtnl_lock();
1366                 for_each_netdev(&init_net, dev) {
1367                         if (ic_is_init_dev(dev)) {
1368                                 found = 1;
1369                                 break;
1370                         }
1371                 }
1372                 rtnl_unlock();
1373                 if (found)
1374                         return 0;
1375                 ssleep(1);
1376         }
1377         return -ENODEV;
1378 }
1379
1380 /*
1381  *      IP Autoconfig dispatcher.
1382  */
1383
1384 static int __init ip_auto_config(void)
1385 {
1386         __be32 addr;
1387 #ifdef IPCONFIG_DYNAMIC
1388         int retries = CONF_OPEN_RETRIES;
1389 #endif
1390         int err;
1391         unsigned int i;
1392
1393 #ifdef CONFIG_PROC_FS
1394         proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
1395 #endif /* CONFIG_PROC_FS */
1396
1397         if (!ic_enable)
1398                 return 0;
1399
1400         pr_debug("IP-Config: Entered.\n");
1401 #ifdef IPCONFIG_DYNAMIC
1402  try_try_again:
1403 #endif
1404         /* Wait for devices to appear */
1405         err = wait_for_devices();
1406         if (err)
1407                 return err;
1408
1409         /* Setup all network devices */
1410         err = ic_open_devs();
1411         if (err)
1412                 return err;
1413
1414         /* Give drivers a chance to settle */
1415         msleep(CONF_POST_OPEN);
1416
1417         /*
1418          * If the config information is insufficient (e.g., our IP address or
1419          * IP address of the boot server is missing or we have multiple network
1420          * interfaces and no default was set), use BOOTP or RARP to get the
1421          * missing values.
1422          */
1423         if (ic_myaddr == NONE ||
1424 #ifdef CONFIG_ROOT_NFS
1425             (root_server_addr == NONE &&
1426              ic_servaddr == NONE &&
1427              ROOT_DEV == Root_NFS) ||
1428 #endif
1429             ic_first_dev->next) {
1430 #ifdef IPCONFIG_DYNAMIC
1431                 if (ic_dynamic() < 0) {
1432                         ic_close_devs();
1433
1434                         /*
1435                          * I don't know why, but sometimes the
1436                          * eepro100 driver (at least) gets upset and
1437                          * doesn't work the first time it's opened.
1438                          * But then if you close it and reopen it, it
1439                          * works just fine.  So we need to try that at
1440                          * least once before giving up.
1441                          *
1442                          * Also, if the root will be NFS-mounted, we
1443                          * have nowhere to go if DHCP fails.  So we
1444                          * just have to keep trying forever.
1445                          *
1446                          *                              -- Chip
1447                          */
1448 #ifdef CONFIG_ROOT_NFS
1449                         if (ROOT_DEV ==  Root_NFS) {
1450                                 pr_err("IP-Config: Retrying forever (NFS root)...\n");
1451                                 goto try_try_again;
1452                         }
1453 #endif
1454
1455                         if (--retries) {
1456                                 pr_err("IP-Config: Reopening network devices...\n");
1457                                 goto try_try_again;
1458                         }
1459
1460                         /* Oh, well.  At least we tried. */
1461                         pr_err("IP-Config: Auto-configuration of network failed\n");
1462                         return -1;
1463                 }
1464 #else /* !DYNAMIC */
1465                 pr_err("IP-Config: Incomplete network configuration information\n");
1466                 ic_close_devs();
1467                 return -1;
1468 #endif /* IPCONFIG_DYNAMIC */
1469         } else {
1470                 /* Device selected manually or only one device -> use it */
1471                 ic_dev = ic_first_dev;
1472         }
1473
1474         addr = root_nfs_parse_addr(root_server_path);
1475         if (root_server_addr == NONE)
1476                 root_server_addr = addr;
1477
1478         /*
1479          * Use defaults wherever applicable.
1480          */
1481         if (ic_defaults() < 0)
1482                 return -1;
1483
1484         /*
1485          * Record which protocol was actually used.
1486          */
1487 #ifdef IPCONFIG_DYNAMIC
1488         ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
1489 #endif
1490
1491 #ifndef IPCONFIG_SILENT
1492         /*
1493          * Clue in the operator.
1494          */
1495         pr_info("IP-Config: Complete:\n");
1496
1497         pr_info("     device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
1498                 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr,
1499                 &ic_myaddr, &ic_netmask, &ic_gateway);
1500         pr_info("     host=%s, domain=%s, nis-domain=%s\n",
1501                 utsname()->nodename, ic_domain, utsname()->domainname);
1502         pr_info("     bootserver=%pI4, rootserver=%pI4, rootpath=%s",
1503                 &ic_servaddr, &root_server_addr, root_server_path);
1504         if (ic_dev_mtu)
1505                 pr_cont(", mtu=%d", ic_dev_mtu);
1506         for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
1507                 if (ic_nameservers[i] != NONE) {
1508                         pr_cont("     nameserver%u=%pI4",
1509                                 i, &ic_nameservers[i]);
1510                         break;
1511                 }
1512         for (i++; i < CONF_NAMESERVERS_MAX; i++)
1513                 if (ic_nameservers[i] != NONE)
1514                         pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
1515         pr_cont("\n");
1516 #endif /* !SILENT */
1517
1518         /*
1519          * Close all network devices except the device we've
1520          * autoconfigured and set up routes.
1521          */
1522         if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1523                 err = -1;
1524         else
1525                 err = 0;
1526
1527         ic_close_devs();
1528
1529         return err;
1530 }
1531
1532 late_initcall(ip_auto_config);
1533
1534
1535 /*
1536  *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1537  *  command line parameter.  See Documentation/filesystems/nfs/nfsroot.txt.
1538  */
1539 static int __init ic_proto_name(char *name)
1540 {
1541         if (!strcmp(name, "on") || !strcmp(name, "any")) {
1542                 return 1;
1543         }
1544         if (!strcmp(name, "off") || !strcmp(name, "none")) {
1545                 return 0;
1546         }
1547 #ifdef CONFIG_IP_PNP_DHCP
1548         else if (!strncmp(name, "dhcp", 4)) {
1549                 char *client_id;
1550
1551                 ic_proto_enabled &= ~IC_RARP;
1552                 client_id = strstr(name, "dhcp,");
1553                 if (client_id) {
1554                         char *v;
1555
1556                         client_id = client_id + 5;
1557                         v = strchr(client_id, ',');
1558                         if (!v)
1559                                 return 1;
1560                         *v = 0;
1561                         if (kstrtou8(client_id, 0, dhcp_client_identifier))
1562                                 pr_debug("DHCP: Invalid client identifier type\n");
1563                         strncpy(dhcp_client_identifier + 1, v + 1, 251);
1564                         *v = ',';
1565                 }
1566                 return 1;
1567         }
1568 #endif
1569 #ifdef CONFIG_IP_PNP_BOOTP
1570         else if (!strcmp(name, "bootp")) {
1571                 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
1572                 return 1;
1573         }
1574 #endif
1575 #ifdef CONFIG_IP_PNP_RARP
1576         else if (!strcmp(name, "rarp")) {
1577                 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
1578                 return 1;
1579         }
1580 #endif
1581 #ifdef IPCONFIG_DYNAMIC
1582         else if (!strcmp(name, "both")) {
1583                 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
1584                 return 1;
1585         }
1586 #endif
1587         return 0;
1588 }
1589
1590 static int __init ip_auto_config_setup(char *addrs)
1591 {
1592         char *cp, *ip, *dp;
1593         int num = 0;
1594
1595         ic_set_manually = 1;
1596         ic_enable = 1;
1597
1598         /*
1599          * If any dhcp, bootp etc options are set, leave autoconfig on
1600          * and skip the below static IP processing.
1601          */
1602         if (ic_proto_name(addrs))
1603                 return 1;
1604
1605         /* If no static IP is given, turn off autoconfig and bail.  */
1606         if (*addrs == 0 ||
1607             strcmp(addrs, "off") == 0 ||
1608             strcmp(addrs, "none") == 0) {
1609                 ic_enable = 0;
1610                 return 1;
1611         }
1612
1613         ic_nameservers_predef();
1614
1615         /* Parse string for static IP assignment.  */
1616         ip = addrs;
1617         while (ip && *ip) {
1618                 if ((cp = strchr(ip, ':')))
1619                         *cp++ = '\0';
1620                 if (strlen(ip) > 0) {
1621                         pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip);
1622                         switch (num) {
1623                         case 0:
1624                                 if ((ic_myaddr = in_aton(ip)) == ANY)
1625                                         ic_myaddr = NONE;
1626                                 break;
1627                         case 1:
1628                                 if ((ic_servaddr = in_aton(ip)) == ANY)
1629                                         ic_servaddr = NONE;
1630                                 break;
1631                         case 2:
1632                                 if ((ic_gateway = in_aton(ip)) == ANY)
1633                                         ic_gateway = NONE;
1634                                 break;
1635                         case 3:
1636                                 if ((ic_netmask = in_aton(ip)) == ANY)
1637                                         ic_netmask = NONE;
1638                                 break;
1639                         case 4:
1640                                 if ((dp = strchr(ip, '.'))) {
1641                                         *dp++ = '\0';
1642                                         strlcpy(utsname()->domainname, dp,
1643                                                 sizeof(utsname()->domainname));
1644                                 }
1645                                 strlcpy(utsname()->nodename, ip,
1646                                         sizeof(utsname()->nodename));
1647                                 ic_host_name_set = 1;
1648                                 break;
1649                         case 5:
1650                                 strlcpy(user_dev_name, ip, sizeof(user_dev_name));
1651                                 break;
1652                         case 6:
1653                                 if (ic_proto_name(ip) == 0 &&
1654                                     ic_myaddr == NONE) {
1655                                         ic_enable = 0;
1656                                 }
1657                                 break;
1658                         case 7:
1659                                 if (CONF_NAMESERVERS_MAX >= 1) {
1660                                         ic_nameservers[0] = in_aton(ip);
1661                                         if (ic_nameservers[0] == ANY)
1662                                                 ic_nameservers[0] = NONE;
1663                                 }
1664                                 break;
1665                         case 8:
1666                                 if (CONF_NAMESERVERS_MAX >= 2) {
1667                                         ic_nameservers[1] = in_aton(ip);
1668                                         if (ic_nameservers[1] == ANY)
1669                                                 ic_nameservers[1] = NONE;
1670                                 }
1671                                 break;
1672                         }
1673                 }
1674                 ip = cp;
1675                 num++;
1676         }
1677
1678         return 1;
1679 }
1680 __setup("ip=", ip_auto_config_setup);
1681
1682 static int __init nfsaddrs_config_setup(char *addrs)
1683 {
1684         return ip_auto_config_setup(addrs);
1685 }
1686 __setup("nfsaddrs=", nfsaddrs_config_setup);
1687
1688 static int __init vendor_class_identifier_setup(char *addrs)
1689 {
1690         if (strlcpy(vendor_class_identifier, addrs,
1691                     sizeof(vendor_class_identifier))
1692             >= sizeof(vendor_class_identifier))
1693                 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
1694                         vendor_class_identifier);
1695         return 1;
1696 }
1697 __setup("dhcpclass=", vendor_class_identifier_setup);