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