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