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