1 /* 2 * $Id: ipconfig.c,v 1.46 2002/02/01 22:01:04 davem Exp $ 3 * 4 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or 5 * user-supplied information to configure own IP address and routes. 6 * 7 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz> 8 * 9 * Derived from network configuration code in fs/nfs/nfsroot.c, 10 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me. 11 * 12 * BOOTP rewritten to construct and analyse packets itself instead 13 * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--; 14 * -- MJ, December 1998 15 * 16 * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic" 17 * initialization scheme. 18 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999 19 * 20 * DHCP support added. To users this looks like a whole separate 21 * protocol, but we know it's just a bag on the side of BOOTP. 22 * -- Chip Salzenberg <chip@valinux.com>, May 2000 23 * 24 * Ported DHCP support from 2.2.16 to 2.4.0-test4 25 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000 26 * 27 * Merged changes from 2.2.19 into 2.4.3 28 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001 29 * 30 * Multiple Nameservers in /proc/net/pnp 31 * -- Josef Siemes <jsiemes@web.de>, Aug 2002 32 */ 33 34 #include <linux/types.h> 35 #include <linux/string.h> 36 #include <linux/kernel.h> 37 #include <linux/jiffies.h> 38 #include <linux/random.h> 39 #include <linux/init.h> 40 #include <linux/utsname.h> 41 #include <linux/in.h> 42 #include <linux/if.h> 43 #include <linux/inet.h> 44 #include <linux/inetdevice.h> 45 #include <linux/netdevice.h> 46 #include <linux/if_arp.h> 47 #include <linux/skbuff.h> 48 #include <linux/ip.h> 49 #include <linux/socket.h> 50 #include <linux/route.h> 51 #include <linux/udp.h> 52 #include <linux/proc_fs.h> 53 #include <linux/seq_file.h> 54 #include <linux/major.h> 55 #include <linux/root_dev.h> 56 #include <linux/delay.h> 57 #include <linux/nfs_fs.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_PRE_OPEN 500 /* Before opening: 1/2 second */ 92 #define CONF_POST_OPEN 1 /* After opening: 1 second */ 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 __constant_htonl(INADDR_NONE) 106 #define ANY __constant_htonl(INADDR_ANY) 107 108 /* 109 * Public IP configuration 110 */ 111 112 /* This is used by platforms which might be able to set the ipconfig 113 * variables using firmware environment vars. If this is set, it will 114 * ignore such firmware variables. 115 */ 116 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ 117 118 static int ic_enable __initdata = 0; /* IP config enabled? */ 119 120 /* Protocol choice */ 121 int ic_proto_enabled __initdata = 0 122 #ifdef IPCONFIG_BOOTP 123 | IC_BOOTP 124 #endif 125 #ifdef CONFIG_IP_PNP_DHCP 126 | IC_USE_DHCP 127 #endif 128 #ifdef IPCONFIG_RARP 129 | IC_RARP 130 #endif 131 ; 132 133 static int ic_host_name_set __initdata = 0; /* Host name set by us? */ 134 135 __be32 ic_myaddr = NONE; /* My IP address */ 136 static __be32 ic_netmask = NONE; /* Netmask for local subnet */ 137 __be32 ic_gateway = NONE; /* Gateway IP address */ 138 139 __be32 ic_servaddr = NONE; /* Boot server IP address */ 140 141 __be32 root_server_addr = NONE; /* Address of NFS server */ 142 u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 143 144 /* vendor class identifier */ 145 static char vendor_class_identifier[253] __initdata; 146 147 /* Persistent data: */ 148 149 static int ic_proto_used; /* Protocol used, if any */ 150 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 151 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 152 153 /* 154 * Private state. 155 */ 156 157 /* Name of user-selected boot device */ 158 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 159 160 /* Protocols supported by available interfaces */ 161 static int ic_proto_have_if __initdata = 0; 162 163 #ifdef IPCONFIG_DYNAMIC 164 static DEFINE_SPINLOCK(ic_recv_lock); 165 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */ 166 #endif 167 #ifdef IPCONFIG_DHCP 168 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */ 169 #endif 170 171 172 /* 173 * Network devices 174 */ 175 176 struct ic_device { 177 struct ic_device *next; 178 struct net_device *dev; 179 unsigned short flags; 180 short able; 181 __be32 xid; 182 }; 183 184 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */ 185 static struct net_device *ic_dev __initdata = NULL; /* Selected device */ 186 187 static int __init ic_open_devs(void) 188 { 189 struct ic_device *d, **last; 190 struct net_device *dev; 191 unsigned short oflags; 192 193 last = &ic_first_dev; 194 rtnl_lock(); 195 196 /* bring loopback device up first */ 197 for_each_netdev(&init_net, dev) { 198 if (!(dev->flags & IFF_LOOPBACK)) 199 continue; 200 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) 201 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); 202 } 203 204 for_each_netdev(&init_net, dev) { 205 if (dev->flags & IFF_LOOPBACK) 206 continue; 207 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 208 (!(dev->flags & IFF_LOOPBACK) && 209 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 210 strncmp(dev->name, "dummy", 5))) { 211 int able = 0; 212 if (dev->mtu >= 364) 213 able |= IC_BOOTP; 214 else 215 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu); 216 if (!(dev->flags & IFF_NOARP)) 217 able |= IC_RARP; 218 able &= ic_proto_enabled; 219 if (ic_proto_enabled && !able) 220 continue; 221 oflags = dev->flags; 222 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 223 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); 224 continue; 225 } 226 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 227 rtnl_unlock(); 228 return -1; 229 } 230 d->dev = dev; 231 *last = d; 232 last = &d->next; 233 d->flags = oflags; 234 d->able = able; 235 if (able & IC_BOOTP) 236 get_random_bytes(&d->xid, sizeof(__be32)); 237 else 238 d->xid = 0; 239 ic_proto_have_if |= able; 240 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", 241 dev->name, able, d->xid)); 242 } 243 } 244 rtnl_unlock(); 245 246 *last = NULL; 247 248 if (!ic_first_dev) { 249 if (user_dev_name[0]) 250 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name); 251 else 252 printk(KERN_ERR "IP-Config: No network devices available.\n"); 253 return -1; 254 } 255 return 0; 256 } 257 258 static void __init ic_close_devs(void) 259 { 260 struct ic_device *d, *next; 261 struct net_device *dev; 262 263 rtnl_lock(); 264 next = ic_first_dev; 265 while ((d = next)) { 266 next = d->next; 267 dev = d->dev; 268 if (dev != ic_dev) { 269 DBG(("IP-Config: Downing %s\n", dev->name)); 270 dev_change_flags(dev, d->flags); 271 } 272 kfree(d); 273 } 274 rtnl_unlock(); 275 } 276 277 /* 278 * Interface to various network functions. 279 */ 280 281 static inline void 282 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 283 { 284 sin->sin_family = AF_INET; 285 sin->sin_addr.s_addr = addr; 286 sin->sin_port = port; 287 } 288 289 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 290 { 291 int res; 292 293 mm_segment_t oldfs = get_fs(); 294 set_fs(get_ds()); 295 res = devinet_ioctl(cmd, (struct ifreq __user *) arg); 296 set_fs(oldfs); 297 return res; 298 } 299 300 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 301 { 302 int res; 303 304 mm_segment_t oldfs = get_fs(); 305 set_fs(get_ds()); 306 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); 307 set_fs(oldfs); 308 return res; 309 } 310 311 /* 312 * Set up interface addresses and routes. 313 */ 314 315 static int __init ic_setup_if(void) 316 { 317 struct ifreq ir; 318 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 319 int err; 320 321 memset(&ir, 0, sizeof(ir)); 322 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); 323 set_sockaddr(sin, ic_myaddr, 0); 324 if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) { 325 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err); 326 return -1; 327 } 328 set_sockaddr(sin, ic_netmask, 0); 329 if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 330 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err); 331 return -1; 332 } 333 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 334 if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 335 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err); 336 return -1; 337 } 338 return 0; 339 } 340 341 static int __init ic_setup_routes(void) 342 { 343 /* No need to setup device routes, only the default route... */ 344 345 if (ic_gateway != NONE) { 346 struct rtentry rm; 347 int err; 348 349 memset(&rm, 0, sizeof(rm)); 350 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 351 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n"); 352 return -1; 353 } 354 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 355 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 356 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 357 rm.rt_flags = RTF_UP | RTF_GATEWAY; 358 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 359 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err); 360 return -1; 361 } 362 } 363 364 return 0; 365 } 366 367 /* 368 * Fill in default values for all missing parameters. 369 */ 370 371 static int __init ic_defaults(void) 372 { 373 /* 374 * At this point we have no userspace running so need not 375 * claim locks on system_utsname 376 */ 377 378 if (!ic_host_name_set) 379 sprintf(init_utsname()->nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr)); 380 381 if (root_server_addr == NONE) 382 root_server_addr = ic_servaddr; 383 384 if (ic_netmask == NONE) { 385 if (IN_CLASSA(ntohl(ic_myaddr))) 386 ic_netmask = htonl(IN_CLASSA_NET); 387 else if (IN_CLASSB(ntohl(ic_myaddr))) 388 ic_netmask = htonl(IN_CLASSB_NET); 389 else if (IN_CLASSC(ntohl(ic_myaddr))) 390 ic_netmask = htonl(IN_CLASSC_NET); 391 else { 392 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n", 393 NIPQUAD(ic_myaddr)); 394 return -1; 395 } 396 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask)); 397 } 398 399 return 0; 400 } 401 402 /* 403 * RARP support. 404 */ 405 406 #ifdef IPCONFIG_RARP 407 408 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 409 410 static struct packet_type rarp_packet_type __initdata = { 411 .type = __constant_htons(ETH_P_RARP), 412 .func = ic_rarp_recv, 413 }; 414 415 static inline void ic_rarp_init(void) 416 { 417 dev_add_pack(&rarp_packet_type); 418 } 419 420 static inline void ic_rarp_cleanup(void) 421 { 422 dev_remove_pack(&rarp_packet_type); 423 } 424 425 /* 426 * Process received RARP packet. 427 */ 428 static int __init 429 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 430 { 431 struct arphdr *rarp; 432 unsigned char *rarp_ptr; 433 __be32 sip, tip; 434 unsigned char *sha, *tha; /* s for "source", t for "target" */ 435 struct ic_device *d; 436 437 if (dev->nd_net != &init_net) 438 goto drop; 439 440 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 441 return NET_RX_DROP; 442 443 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 444 goto drop; 445 446 /* Basic sanity checks can be done without the lock. */ 447 rarp = (struct arphdr *)skb_transport_header(skb); 448 449 /* If this test doesn't pass, it's not IP, or we should 450 * ignore it anyway. 451 */ 452 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 453 goto drop; 454 455 /* If it's not a RARP reply, delete it. */ 456 if (rarp->ar_op != htons(ARPOP_RREPLY)) 457 goto drop; 458 459 /* If it's not Ethernet, delete it. */ 460 if (rarp->ar_pro != htons(ETH_P_IP)) 461 goto drop; 462 463 if (!pskb_may_pull(skb, 464 sizeof(struct arphdr) + 465 (2 * dev->addr_len) + 466 (2 * 4))) 467 goto drop; 468 469 /* OK, it is all there and looks valid, process... */ 470 rarp = (struct arphdr *)skb_transport_header(skb); 471 rarp_ptr = (unsigned char *) (rarp + 1); 472 473 /* One reply at a time, please. */ 474 spin_lock(&ic_recv_lock); 475 476 /* If we already have a reply, just drop the packet */ 477 if (ic_got_reply) 478 goto drop_unlock; 479 480 /* Find the ic_device that the packet arrived on */ 481 d = ic_first_dev; 482 while (d && d->dev != dev) 483 d = d->next; 484 if (!d) 485 goto drop_unlock; /* should never happen */ 486 487 /* Extract variable-width fields */ 488 sha = rarp_ptr; 489 rarp_ptr += dev->addr_len; 490 memcpy(&sip, rarp_ptr, 4); 491 rarp_ptr += 4; 492 tha = rarp_ptr; 493 rarp_ptr += dev->addr_len; 494 memcpy(&tip, rarp_ptr, 4); 495 496 /* Discard packets which are not meant for us. */ 497 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 498 goto drop_unlock; 499 500 /* Discard packets which are not from specified server. */ 501 if (ic_servaddr != NONE && ic_servaddr != sip) 502 goto drop_unlock; 503 504 /* We have a winner! */ 505 ic_dev = dev; 506 if (ic_myaddr == NONE) 507 ic_myaddr = tip; 508 ic_servaddr = sip; 509 ic_got_reply = IC_RARP; 510 511 drop_unlock: 512 /* Show's over. Nothing to see here. */ 513 spin_unlock(&ic_recv_lock); 514 515 drop: 516 /* Throw the packet out. */ 517 kfree_skb(skb); 518 return 0; 519 } 520 521 522 /* 523 * Send RARP request packet over a single interface. 524 */ 525 static void __init ic_rarp_send_if(struct ic_device *d) 526 { 527 struct net_device *dev = d->dev; 528 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 529 dev->dev_addr, dev->dev_addr); 530 } 531 #endif 532 533 /* 534 * DHCP/BOOTP support. 535 */ 536 537 #ifdef IPCONFIG_BOOTP 538 539 struct bootp_pkt { /* BOOTP packet format */ 540 struct iphdr iph; /* IP header */ 541 struct udphdr udph; /* UDP header */ 542 u8 op; /* 1=request, 2=reply */ 543 u8 htype; /* HW address type */ 544 u8 hlen; /* HW address length */ 545 u8 hops; /* Used only by gateways */ 546 __be32 xid; /* Transaction ID */ 547 __be16 secs; /* Seconds since we started */ 548 __be16 flags; /* Just what it says */ 549 __be32 client_ip; /* Client's IP address if known */ 550 __be32 your_ip; /* Assigned IP address */ 551 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 552 __be32 relay_ip; /* IP address of BOOTP relay */ 553 u8 hw_addr[16]; /* Client's HW address */ 554 u8 serv_name[64]; /* Server host name */ 555 u8 boot_file[128]; /* Name of boot file */ 556 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 557 }; 558 559 /* packet ops */ 560 #define BOOTP_REQUEST 1 561 #define BOOTP_REPLY 2 562 563 /* DHCP message types */ 564 #define DHCPDISCOVER 1 565 #define DHCPOFFER 2 566 #define DHCPREQUEST 3 567 #define DHCPDECLINE 4 568 #define DHCPACK 5 569 #define DHCPNAK 6 570 #define DHCPRELEASE 7 571 #define DHCPINFORM 8 572 573 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 574 575 static struct packet_type bootp_packet_type __initdata = { 576 .type = __constant_htons(ETH_P_IP), 577 .func = ic_bootp_recv, 578 }; 579 580 581 /* 582 * Initialize DHCP/BOOTP extension fields in the request. 583 */ 584 585 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 586 587 #ifdef IPCONFIG_DHCP 588 589 static void __init 590 ic_dhcp_init_options(u8 *options) 591 { 592 u8 mt = ((ic_servaddr == NONE) 593 ? DHCPDISCOVER : DHCPREQUEST); 594 u8 *e = options; 595 int len; 596 597 #ifdef IPCONFIG_DEBUG 598 printk("DHCP: Sending message type %d\n", mt); 599 #endif 600 601 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 602 e += 4; 603 604 *e++ = 53; /* DHCP message type */ 605 *e++ = 1; 606 *e++ = mt; 607 608 if (mt == DHCPREQUEST) { 609 *e++ = 54; /* Server ID (IP address) */ 610 *e++ = 4; 611 memcpy(e, &ic_servaddr, 4); 612 e += 4; 613 614 *e++ = 50; /* Requested IP address */ 615 *e++ = 4; 616 memcpy(e, &ic_myaddr, 4); 617 e += 4; 618 } 619 620 /* always? */ 621 { 622 static const u8 ic_req_params[] = { 623 1, /* Subnet mask */ 624 3, /* Default gateway */ 625 6, /* DNS server */ 626 12, /* Host name */ 627 15, /* Domain name */ 628 17, /* Boot path */ 629 40, /* NIS domain name */ 630 }; 631 632 *e++ = 55; /* Parameter request list */ 633 *e++ = sizeof(ic_req_params); 634 memcpy(e, ic_req_params, sizeof(ic_req_params)); 635 e += sizeof(ic_req_params); 636 637 if (*vendor_class_identifier) { 638 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n", 639 vendor_class_identifier); 640 *e++ = 60; /* Class-identifier */ 641 len = strlen(vendor_class_identifier); 642 *e++ = len; 643 memcpy(e, vendor_class_identifier, len); 644 e += len; 645 } 646 } 647 648 *e++ = 255; /* End of the list */ 649 } 650 651 #endif /* IPCONFIG_DHCP */ 652 653 static void __init ic_bootp_init_ext(u8 *e) 654 { 655 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 656 e += 4; 657 *e++ = 1; /* Subnet mask request */ 658 *e++ = 4; 659 e += 4; 660 *e++ = 3; /* Default gateway request */ 661 *e++ = 4; 662 e += 4; 663 *e++ = 5; /* Name server request */ 664 *e++ = 8; 665 e += 8; 666 *e++ = 12; /* Host name request */ 667 *e++ = 32; 668 e += 32; 669 *e++ = 40; /* NIS Domain name request */ 670 *e++ = 32; 671 e += 32; 672 *e++ = 17; /* Boot path */ 673 *e++ = 40; 674 e += 40; 675 676 *e++ = 57; /* set extension buffer size for reply */ 677 *e++ = 2; 678 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 679 *e++ = 150; 680 681 *e++ = 255; /* End of the list */ 682 } 683 684 685 /* 686 * Initialize the DHCP/BOOTP mechanism. 687 */ 688 static inline void ic_bootp_init(void) 689 { 690 int i; 691 692 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 693 ic_nameservers[i] = NONE; 694 695 dev_add_pack(&bootp_packet_type); 696 } 697 698 699 /* 700 * DHCP/BOOTP cleanup. 701 */ 702 static inline void ic_bootp_cleanup(void) 703 { 704 dev_remove_pack(&bootp_packet_type); 705 } 706 707 708 /* 709 * Send DHCP/BOOTP request to single interface. 710 */ 711 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 712 { 713 struct net_device *dev = d->dev; 714 struct sk_buff *skb; 715 struct bootp_pkt *b; 716 int hh_len = LL_RESERVED_SPACE(dev); 717 struct iphdr *h; 718 719 /* Allocate packet */ 720 skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL); 721 if (!skb) 722 return; 723 skb_reserve(skb, hh_len); 724 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 725 memset(b, 0, sizeof(struct bootp_pkt)); 726 727 /* Construct IP header */ 728 skb_reset_network_header(skb); 729 h = ip_hdr(skb); 730 h->version = 4; 731 h->ihl = 5; 732 h->tot_len = htons(sizeof(struct bootp_pkt)); 733 h->frag_off = htons(IP_DF); 734 h->ttl = 64; 735 h->protocol = IPPROTO_UDP; 736 h->daddr = htonl(INADDR_BROADCAST); 737 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 738 739 /* Construct UDP header */ 740 b->udph.source = htons(68); 741 b->udph.dest = htons(67); 742 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 743 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 744 745 /* Construct DHCP/BOOTP header */ 746 b->op = BOOTP_REQUEST; 747 if (dev->type < 256) /* check for false types */ 748 b->htype = dev->type; 749 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ 750 b->htype = ARPHRD_IEEE802; 751 else if (dev->type == ARPHRD_FDDI) 752 b->htype = ARPHRD_ETHER; 753 else { 754 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 755 b->htype = dev->type; /* can cause undefined behavior */ 756 } 757 758 /* server_ip and your_ip address are both already zero per RFC2131 */ 759 b->hlen = dev->addr_len; 760 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 761 b->secs = htons(jiffies_diff / HZ); 762 b->xid = d->xid; 763 764 /* add DHCP options or BOOTP extensions */ 765 #ifdef IPCONFIG_DHCP 766 if (ic_proto_enabled & IC_USE_DHCP) 767 ic_dhcp_init_options(b->exten); 768 else 769 #endif 770 ic_bootp_init_ext(b->exten); 771 772 /* Chain packet down the line... */ 773 skb->dev = dev; 774 skb->protocol = htons(ETH_P_IP); 775 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 776 dev->broadcast, dev->dev_addr, skb->len) < 0 || 777 dev_queue_xmit(skb) < 0) 778 printk("E"); 779 } 780 781 782 /* 783 * Copy BOOTP-supplied string if not already set. 784 */ 785 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 786 { 787 if (!len) 788 return 0; 789 if (len > max-1) 790 len = max-1; 791 memcpy(dest, src, len); 792 dest[len] = '\0'; 793 return 1; 794 } 795 796 797 /* 798 * Process BOOTP extensions. 799 */ 800 static void __init ic_do_bootp_ext(u8 *ext) 801 { 802 u8 servers; 803 int i; 804 805 #ifdef IPCONFIG_DEBUG 806 u8 *c; 807 808 printk("DHCP/BOOTP: Got extension %d:",*ext); 809 for (c=ext+2; c<ext+2+ext[1]; c++) 810 printk(" %02x", *c); 811 printk("\n"); 812 #endif 813 814 switch (*ext++) { 815 case 1: /* Subnet mask */ 816 if (ic_netmask == NONE) 817 memcpy(&ic_netmask, ext+1, 4); 818 break; 819 case 3: /* Default gateway */ 820 if (ic_gateway == NONE) 821 memcpy(&ic_gateway, ext+1, 4); 822 break; 823 case 6: /* DNS server */ 824 servers= *ext/4; 825 if (servers > CONF_NAMESERVERS_MAX) 826 servers = CONF_NAMESERVERS_MAX; 827 for (i = 0; i < servers; i++) { 828 if (ic_nameservers[i] == NONE) 829 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 830 } 831 break; 832 case 12: /* Host name */ 833 ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN); 834 ic_host_name_set = 1; 835 break; 836 case 15: /* Domain name (DNS) */ 837 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 838 break; 839 case 17: /* Root path */ 840 if (!root_server_path[0]) 841 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path)); 842 break; 843 case 40: /* NIS Domain name (_not_ DNS) */ 844 ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN); 845 break; 846 } 847 } 848 849 850 /* 851 * Receive BOOTP reply. 852 */ 853 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 854 { 855 struct bootp_pkt *b; 856 struct iphdr *h; 857 struct ic_device *d; 858 int len, ext_len; 859 860 if (dev->nd_net != &init_net) 861 goto drop; 862 863 /* Perform verifications before taking the lock. */ 864 if (skb->pkt_type == PACKET_OTHERHOST) 865 goto drop; 866 867 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 868 return NET_RX_DROP; 869 870 if (!pskb_may_pull(skb, 871 sizeof(struct iphdr) + 872 sizeof(struct udphdr))) 873 goto drop; 874 875 b = (struct bootp_pkt *)skb_network_header(skb); 876 h = &b->iph; 877 878 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 879 goto drop; 880 881 /* Fragments are not supported */ 882 if (h->frag_off & htons(IP_OFFSET | IP_MF)) { 883 if (net_ratelimit()) 884 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " 885 "reply.\n"); 886 goto drop; 887 } 888 889 if (skb->len < ntohs(h->tot_len)) 890 goto drop; 891 892 if (ip_fast_csum((char *) h, h->ihl)) 893 goto drop; 894 895 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 896 goto drop; 897 898 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 899 goto drop; 900 901 len = ntohs(b->udph.len) - sizeof(struct udphdr); 902 ext_len = len - (sizeof(*b) - 903 sizeof(struct iphdr) - 904 sizeof(struct udphdr) - 905 sizeof(b->exten)); 906 if (ext_len < 0) 907 goto drop; 908 909 /* Ok the front looks good, make sure we can get at the rest. */ 910 if (!pskb_may_pull(skb, skb->len)) 911 goto drop; 912 913 b = (struct bootp_pkt *)skb_network_header(skb); 914 h = &b->iph; 915 916 /* One reply at a time, please. */ 917 spin_lock(&ic_recv_lock); 918 919 /* If we already have a reply, just drop the packet */ 920 if (ic_got_reply) 921 goto drop_unlock; 922 923 /* Find the ic_device that the packet arrived on */ 924 d = ic_first_dev; 925 while (d && d->dev != dev) 926 d = d->next; 927 if (!d) 928 goto drop_unlock; /* should never happen */ 929 930 /* Is it a reply to our BOOTP request? */ 931 if (b->op != BOOTP_REPLY || 932 b->xid != d->xid) { 933 if (net_ratelimit()) 934 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " 935 "op[%x] xid[%x]\n", 936 b->op, b->xid); 937 goto drop_unlock; 938 } 939 940 /* Parse extensions */ 941 if (ext_len >= 4 && 942 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 943 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 944 u8 *ext; 945 946 #ifdef IPCONFIG_DHCP 947 if (ic_proto_enabled & IC_USE_DHCP) { 948 __be32 server_id = NONE; 949 int mt = 0; 950 951 ext = &b->exten[4]; 952 while (ext < end && *ext != 0xff) { 953 u8 *opt = ext++; 954 if (*opt == 0) /* Padding */ 955 continue; 956 ext += *ext + 1; 957 if (ext >= end) 958 break; 959 switch (*opt) { 960 case 53: /* Message type */ 961 if (opt[1]) 962 mt = opt[2]; 963 break; 964 case 54: /* Server ID (IP address) */ 965 if (opt[1] >= 4) 966 memcpy(&server_id, opt + 2, 4); 967 break; 968 } 969 } 970 971 #ifdef IPCONFIG_DEBUG 972 printk("DHCP: Got message type %d\n", mt); 973 #endif 974 975 switch (mt) { 976 case DHCPOFFER: 977 /* While in the process of accepting one offer, 978 * ignore all others. 979 */ 980 if (ic_myaddr != NONE) 981 goto drop_unlock; 982 983 /* Let's accept that offer. */ 984 ic_myaddr = b->your_ip; 985 ic_servaddr = server_id; 986 #ifdef IPCONFIG_DEBUG 987 printk("DHCP: Offered address %u.%u.%u.%u", 988 NIPQUAD(ic_myaddr)); 989 printk(" by server %u.%u.%u.%u\n", 990 NIPQUAD(ic_servaddr)); 991 #endif 992 /* The DHCP indicated server address takes 993 * precedence over the bootp header one if 994 * they are different. 995 */ 996 if ((server_id != NONE) && 997 (b->server_ip != server_id)) 998 b->server_ip = ic_servaddr; 999 break; 1000 1001 case DHCPACK: 1002 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1003 goto drop_unlock; 1004 1005 /* Yeah! */ 1006 break; 1007 1008 default: 1009 /* Urque. Forget it*/ 1010 ic_myaddr = NONE; 1011 ic_servaddr = NONE; 1012 goto drop_unlock; 1013 } 1014 1015 ic_dhcp_msgtype = mt; 1016 1017 } 1018 #endif /* IPCONFIG_DHCP */ 1019 1020 ext = &b->exten[4]; 1021 while (ext < end && *ext != 0xff) { 1022 u8 *opt = ext++; 1023 if (*opt == 0) /* Padding */ 1024 continue; 1025 ext += *ext + 1; 1026 if (ext < end) 1027 ic_do_bootp_ext(opt); 1028 } 1029 } 1030 1031 /* We have a winner! */ 1032 ic_dev = dev; 1033 ic_myaddr = b->your_ip; 1034 ic_servaddr = b->server_ip; 1035 if (ic_gateway == NONE && b->relay_ip) 1036 ic_gateway = b->relay_ip; 1037 if (ic_nameservers[0] == NONE) 1038 ic_nameservers[0] = ic_servaddr; 1039 ic_got_reply = IC_BOOTP; 1040 1041 drop_unlock: 1042 /* Show's over. Nothing to see here. */ 1043 spin_unlock(&ic_recv_lock); 1044 1045 drop: 1046 /* Throw the packet out. */ 1047 kfree_skb(skb); 1048 1049 return 0; 1050 } 1051 1052 1053 #endif 1054 1055 1056 /* 1057 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1058 */ 1059 1060 #ifdef IPCONFIG_DYNAMIC 1061 1062 static int __init ic_dynamic(void) 1063 { 1064 int retries; 1065 struct ic_device *d; 1066 unsigned long start_jiffies, timeout, jiff; 1067 int do_bootp = ic_proto_have_if & IC_BOOTP; 1068 int do_rarp = ic_proto_have_if & IC_RARP; 1069 1070 /* 1071 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1072 * This routine gets only called when some pieces of information 1073 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1074 */ 1075 if (!ic_proto_enabled) { 1076 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1077 return -1; 1078 } 1079 1080 #ifdef IPCONFIG_BOOTP 1081 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1082 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); 1083 #endif 1084 #ifdef IPCONFIG_RARP 1085 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1086 printk(KERN_ERR "RARP: No suitable device found.\n"); 1087 #endif 1088 1089 if (!ic_proto_have_if) 1090 /* Error message already printed */ 1091 return -1; 1092 1093 /* 1094 * Setup protocols 1095 */ 1096 #ifdef IPCONFIG_BOOTP 1097 if (do_bootp) 1098 ic_bootp_init(); 1099 #endif 1100 #ifdef IPCONFIG_RARP 1101 if (do_rarp) 1102 ic_rarp_init(); 1103 #endif 1104 1105 /* 1106 * Send requests and wait, until we get an answer. This loop 1107 * seems to be a terrible waste of CPU time, but actually there is 1108 * only one process running at all, so we don't need to use any 1109 * scheduler functions. 1110 * [Actually we could now, but the nothing else running note still 1111 * applies.. - AC] 1112 */ 1113 printk(KERN_NOTICE "Sending %s%s%s requests .", 1114 do_bootp 1115 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1116 (do_bootp && do_rarp) ? " and " : "", 1117 do_rarp ? "RARP" : ""); 1118 1119 start_jiffies = jiffies; 1120 d = ic_first_dev; 1121 retries = CONF_SEND_RETRIES; 1122 get_random_bytes(&timeout, sizeof(timeout)); 1123 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); 1124 for (;;) { 1125 #ifdef IPCONFIG_BOOTP 1126 if (do_bootp && (d->able & IC_BOOTP)) 1127 ic_bootp_send_if(d, jiffies - start_jiffies); 1128 #endif 1129 #ifdef IPCONFIG_RARP 1130 if (do_rarp && (d->able & IC_RARP)) 1131 ic_rarp_send_if(d); 1132 #endif 1133 1134 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1135 while (time_before(jiffies, jiff) && !ic_got_reply) 1136 schedule_timeout_uninterruptible(1); 1137 #ifdef IPCONFIG_DHCP 1138 /* DHCP isn't done until we get a DHCPACK. */ 1139 if ((ic_got_reply & IC_BOOTP) 1140 && (ic_proto_enabled & IC_USE_DHCP) 1141 && ic_dhcp_msgtype != DHCPACK) 1142 { 1143 ic_got_reply = 0; 1144 printk(","); 1145 continue; 1146 } 1147 #endif /* IPCONFIG_DHCP */ 1148 1149 if (ic_got_reply) { 1150 printk(" OK\n"); 1151 break; 1152 } 1153 1154 if ((d = d->next)) 1155 continue; 1156 1157 if (! --retries) { 1158 printk(" timed out!\n"); 1159 break; 1160 } 1161 1162 d = ic_first_dev; 1163 1164 timeout = timeout CONF_TIMEOUT_MULT; 1165 if (timeout > CONF_TIMEOUT_MAX) 1166 timeout = CONF_TIMEOUT_MAX; 1167 1168 printk("."); 1169 } 1170 1171 #ifdef IPCONFIG_BOOTP 1172 if (do_bootp) 1173 ic_bootp_cleanup(); 1174 #endif 1175 #ifdef IPCONFIG_RARP 1176 if (do_rarp) 1177 ic_rarp_cleanup(); 1178 #endif 1179 1180 if (!ic_got_reply) { 1181 ic_myaddr = NONE; 1182 return -1; 1183 } 1184 1185 printk("IP-Config: Got %s answer from %u.%u.%u.%u, ", 1186 ((ic_got_reply & IC_RARP) ? "RARP" 1187 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1188 NIPQUAD(ic_servaddr)); 1189 printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr)); 1190 1191 return 0; 1192 } 1193 1194 #endif /* IPCONFIG_DYNAMIC */ 1195 1196 #ifdef CONFIG_PROC_FS 1197 1198 static int pnp_seq_show(struct seq_file *seq, void *v) 1199 { 1200 int i; 1201 1202 if (ic_proto_used & IC_PROTO) 1203 seq_printf(seq, "#PROTO: %s\n", 1204 (ic_proto_used & IC_RARP) ? "RARP" 1205 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1206 else 1207 seq_puts(seq, "#MANUAL\n"); 1208 1209 if (ic_domain[0]) 1210 seq_printf(seq, 1211 "domain %s\n", ic_domain); 1212 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1213 if (ic_nameservers[i] != NONE) 1214 seq_printf(seq, 1215 "nameserver %u.%u.%u.%u\n", 1216 NIPQUAD(ic_nameservers[i])); 1217 } 1218 if (ic_servaddr != NONE) 1219 seq_printf(seq, 1220 "bootserver %u.%u.%u.%u\n", 1221 NIPQUAD(ic_servaddr)); 1222 return 0; 1223 } 1224 1225 static int pnp_seq_open(struct inode *indoe, struct file *file) 1226 { 1227 return single_open(file, pnp_seq_show, NULL); 1228 } 1229 1230 static const struct file_operations pnp_seq_fops = { 1231 .owner = THIS_MODULE, 1232 .open = pnp_seq_open, 1233 .read = seq_read, 1234 .llseek = seq_lseek, 1235 .release = single_release, 1236 }; 1237 #endif /* CONFIG_PROC_FS */ 1238 1239 /* 1240 * Extract IP address from the parameter string if needed. Note that we 1241 * need to have root_server_addr set _before_ IPConfig gets called as it 1242 * can override it. 1243 */ 1244 __be32 __init root_nfs_parse_addr(char *name) 1245 { 1246 __be32 addr; 1247 int octets = 0; 1248 char *cp, *cq; 1249 1250 cp = cq = name; 1251 while (octets < 4) { 1252 while (*cp >= '0' && *cp <= '9') 1253 cp++; 1254 if (cp == cq || cp - cq > 3) 1255 break; 1256 if (*cp == '.' || octets == 3) 1257 octets++; 1258 if (octets < 4) 1259 cp++; 1260 cq = cp; 1261 } 1262 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1263 if (*cp == ':') 1264 *cp++ = '\0'; 1265 addr = in_aton(name); 1266 memmove(name, cp, strlen(cp) + 1); 1267 } else 1268 addr = NONE; 1269 1270 return addr; 1271 } 1272 1273 /* 1274 * IP Autoconfig dispatcher. 1275 */ 1276 1277 static int __init ip_auto_config(void) 1278 { 1279 __be32 addr; 1280 1281 #ifdef CONFIG_PROC_FS 1282 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops); 1283 #endif /* CONFIG_PROC_FS */ 1284 1285 if (!ic_enable) 1286 return 0; 1287 1288 DBG(("IP-Config: Entered.\n")); 1289 #ifdef IPCONFIG_DYNAMIC 1290 try_try_again: 1291 #endif 1292 /* Give hardware a chance to settle */ 1293 msleep(CONF_PRE_OPEN); 1294 1295 /* Setup all network devices */ 1296 if (ic_open_devs() < 0) 1297 return -1; 1298 1299 /* Give drivers a chance to settle */ 1300 ssleep(CONF_POST_OPEN); 1301 1302 /* 1303 * If the config information is insufficient (e.g., our IP address or 1304 * IP address of the boot server is missing or we have multiple network 1305 * interfaces and no default was set), use BOOTP or RARP to get the 1306 * missing values. 1307 */ 1308 if (ic_myaddr == NONE || 1309 #ifdef CONFIG_ROOT_NFS 1310 (root_server_addr == NONE 1311 && ic_servaddr == NONE 1312 && ROOT_DEV == Root_NFS) || 1313 #endif 1314 ic_first_dev->next) { 1315 #ifdef IPCONFIG_DYNAMIC 1316 1317 int retries = CONF_OPEN_RETRIES; 1318 1319 if (ic_dynamic() < 0) { 1320 ic_close_devs(); 1321 1322 /* 1323 * I don't know why, but sometimes the 1324 * eepro100 driver (at least) gets upset and 1325 * doesn't work the first time it's opened. 1326 * But then if you close it and reopen it, it 1327 * works just fine. So we need to try that at 1328 * least once before giving up. 1329 * 1330 * Also, if the root will be NFS-mounted, we 1331 * have nowhere to go if DHCP fails. So we 1332 * just have to keep trying forever. 1333 * 1334 * -- Chip 1335 */ 1336 #ifdef CONFIG_ROOT_NFS 1337 if (ROOT_DEV == Root_NFS) { 1338 printk(KERN_ERR 1339 "IP-Config: Retrying forever (NFS root)...\n"); 1340 goto try_try_again; 1341 } 1342 #endif 1343 1344 if (--retries) { 1345 printk(KERN_ERR 1346 "IP-Config: Reopening network devices...\n"); 1347 goto try_try_again; 1348 } 1349 1350 /* Oh, well. At least we tried. */ 1351 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); 1352 return -1; 1353 } 1354 #else /* !DYNAMIC */ 1355 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1356 ic_close_devs(); 1357 return -1; 1358 #endif /* IPCONFIG_DYNAMIC */ 1359 } else { 1360 /* Device selected manually or only one device -> use it */ 1361 ic_dev = ic_first_dev->dev; 1362 } 1363 1364 addr = root_nfs_parse_addr(root_server_path); 1365 if (root_server_addr == NONE) 1366 root_server_addr = addr; 1367 1368 /* 1369 * Use defaults whereever applicable. 1370 */ 1371 if (ic_defaults() < 0) 1372 return -1; 1373 1374 /* 1375 * Close all network devices except the device we've 1376 * autoconfigured and set up routes. 1377 */ 1378 ic_close_devs(); 1379 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1380 return -1; 1381 1382 /* 1383 * Record which protocol was actually used. 1384 */ 1385 #ifdef IPCONFIG_DYNAMIC 1386 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1387 #endif 1388 1389 #ifndef IPCONFIG_SILENT 1390 /* 1391 * Clue in the operator. 1392 */ 1393 printk("IP-Config: Complete:"); 1394 printk("\n device=%s", ic_dev->name); 1395 printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr)); 1396 printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask)); 1397 printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway)); 1398 printk(",\n host=%s, domain=%s, nis-domain=%s", 1399 utsname()->nodename, ic_domain, utsname()->domainname); 1400 printk(",\n bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr)); 1401 printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr)); 1402 printk(", rootpath=%s", root_server_path); 1403 printk("\n"); 1404 #endif /* !SILENT */ 1405 1406 return 0; 1407 } 1408 1409 late_initcall(ip_auto_config); 1410 1411 1412 /* 1413 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1414 * command line parameter. See Documentation/nfsroot.txt. 1415 */ 1416 static int __init ic_proto_name(char *name) 1417 { 1418 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1419 return 1; 1420 } 1421 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1422 return 0; 1423 } 1424 #ifdef CONFIG_IP_PNP_DHCP 1425 else if (!strcmp(name, "dhcp")) { 1426 ic_proto_enabled &= ~IC_RARP; 1427 return 1; 1428 } 1429 #endif 1430 #ifdef CONFIG_IP_PNP_BOOTP 1431 else if (!strcmp(name, "bootp")) { 1432 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1433 return 1; 1434 } 1435 #endif 1436 #ifdef CONFIG_IP_PNP_RARP 1437 else if (!strcmp(name, "rarp")) { 1438 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1439 return 1; 1440 } 1441 #endif 1442 #ifdef IPCONFIG_DYNAMIC 1443 else if (!strcmp(name, "both")) { 1444 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1445 return 1; 1446 } 1447 #endif 1448 return 0; 1449 } 1450 1451 static int __init ip_auto_config_setup(char *addrs) 1452 { 1453 char *cp, *ip, *dp; 1454 int num = 0; 1455 1456 ic_set_manually = 1; 1457 ic_enable = 1; 1458 1459 /* 1460 * If any dhcp, bootp etc options are set, leave autoconfig on 1461 * and skip the below static IP processing. 1462 */ 1463 if (ic_proto_name(addrs)) 1464 return 1; 1465 1466 /* If no static IP is given, turn off autoconfig and bail. */ 1467 if (*addrs == 0 || 1468 strcmp(addrs, "off") == 0 || 1469 strcmp(addrs, "none") == 0) { 1470 ic_enable = 0; 1471 return 1; 1472 } 1473 1474 /* Parse string for static IP assignment. */ 1475 ip = addrs; 1476 while (ip && *ip) { 1477 if ((cp = strchr(ip, ':'))) 1478 *cp++ = '\0'; 1479 if (strlen(ip) > 0) { 1480 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); 1481 switch (num) { 1482 case 0: 1483 if ((ic_myaddr = in_aton(ip)) == ANY) 1484 ic_myaddr = NONE; 1485 break; 1486 case 1: 1487 if ((ic_servaddr = in_aton(ip)) == ANY) 1488 ic_servaddr = NONE; 1489 break; 1490 case 2: 1491 if ((ic_gateway = in_aton(ip)) == ANY) 1492 ic_gateway = NONE; 1493 break; 1494 case 3: 1495 if ((ic_netmask = in_aton(ip)) == ANY) 1496 ic_netmask = NONE; 1497 break; 1498 case 4: 1499 if ((dp = strchr(ip, '.'))) { 1500 *dp++ = '\0'; 1501 strlcpy(utsname()->domainname, dp, 1502 sizeof(utsname()->domainname)); 1503 } 1504 strlcpy(utsname()->nodename, ip, 1505 sizeof(utsname()->nodename)); 1506 ic_host_name_set = 1; 1507 break; 1508 case 5: 1509 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1510 break; 1511 case 6: 1512 if (ic_proto_name(ip) == 0 && 1513 ic_myaddr == NONE) { 1514 ic_enable = 0; 1515 } 1516 break; 1517 } 1518 } 1519 ip = cp; 1520 num++; 1521 } 1522 1523 return 1; 1524 } 1525 1526 static int __init nfsaddrs_config_setup(char *addrs) 1527 { 1528 return ip_auto_config_setup(addrs); 1529 } 1530 1531 static int __init vendor_class_identifier_setup(char *addrs) 1532 { 1533 if (strlcpy(vendor_class_identifier, addrs, 1534 sizeof(vendor_class_identifier)) 1535 >= sizeof(vendor_class_identifier)) 1536 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"", 1537 vendor_class_identifier); 1538 return 1; 1539 } 1540 1541 __setup("ip=", ip_auto_config_setup); 1542 __setup("nfsaddrs=", nfsaddrs_config_setup); 1543 __setup("dhcpclass=", vendor_class_identifier_setup); 1544