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(&init_net, 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, NIPQUAD_FMT, 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 " NIPQUAD_FMT "\n", 393 NIPQUAD(ic_myaddr)); 394 return -1; 395 } 396 printk("IP-Config: Guessing netmask " NIPQUAD_FMT "\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_net(dev) != &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, arp_hdr_len(dev))) 464 goto drop; 465 466 /* OK, it is all there and looks valid, process... */ 467 rarp = (struct arphdr *)skb_transport_header(skb); 468 rarp_ptr = (unsigned char *) (rarp + 1); 469 470 /* One reply at a time, please. */ 471 spin_lock(&ic_recv_lock); 472 473 /* If we already have a reply, just drop the packet */ 474 if (ic_got_reply) 475 goto drop_unlock; 476 477 /* Find the ic_device that the packet arrived on */ 478 d = ic_first_dev; 479 while (d && d->dev != dev) 480 d = d->next; 481 if (!d) 482 goto drop_unlock; /* should never happen */ 483 484 /* Extract variable-width fields */ 485 sha = rarp_ptr; 486 rarp_ptr += dev->addr_len; 487 memcpy(&sip, rarp_ptr, 4); 488 rarp_ptr += 4; 489 tha = rarp_ptr; 490 rarp_ptr += dev->addr_len; 491 memcpy(&tip, rarp_ptr, 4); 492 493 /* Discard packets which are not meant for us. */ 494 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 495 goto drop_unlock; 496 497 /* Discard packets which are not from specified server. */ 498 if (ic_servaddr != NONE && ic_servaddr != sip) 499 goto drop_unlock; 500 501 /* We have a winner! */ 502 ic_dev = dev; 503 if (ic_myaddr == NONE) 504 ic_myaddr = tip; 505 ic_servaddr = sip; 506 ic_got_reply = IC_RARP; 507 508 drop_unlock: 509 /* Show's over. Nothing to see here. */ 510 spin_unlock(&ic_recv_lock); 511 512 drop: 513 /* Throw the packet out. */ 514 kfree_skb(skb); 515 return 0; 516 } 517 518 519 /* 520 * Send RARP request packet over a single interface. 521 */ 522 static void __init ic_rarp_send_if(struct ic_device *d) 523 { 524 struct net_device *dev = d->dev; 525 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 526 dev->dev_addr, dev->dev_addr); 527 } 528 #endif 529 530 /* 531 * DHCP/BOOTP support. 532 */ 533 534 #ifdef IPCONFIG_BOOTP 535 536 struct bootp_pkt { /* BOOTP packet format */ 537 struct iphdr iph; /* IP header */ 538 struct udphdr udph; /* UDP header */ 539 u8 op; /* 1=request, 2=reply */ 540 u8 htype; /* HW address type */ 541 u8 hlen; /* HW address length */ 542 u8 hops; /* Used only by gateways */ 543 __be32 xid; /* Transaction ID */ 544 __be16 secs; /* Seconds since we started */ 545 __be16 flags; /* Just what it says */ 546 __be32 client_ip; /* Client's IP address if known */ 547 __be32 your_ip; /* Assigned IP address */ 548 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 549 __be32 relay_ip; /* IP address of BOOTP relay */ 550 u8 hw_addr[16]; /* Client's HW address */ 551 u8 serv_name[64]; /* Server host name */ 552 u8 boot_file[128]; /* Name of boot file */ 553 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 554 }; 555 556 /* packet ops */ 557 #define BOOTP_REQUEST 1 558 #define BOOTP_REPLY 2 559 560 /* DHCP message types */ 561 #define DHCPDISCOVER 1 562 #define DHCPOFFER 2 563 #define DHCPREQUEST 3 564 #define DHCPDECLINE 4 565 #define DHCPACK 5 566 #define DHCPNAK 6 567 #define DHCPRELEASE 7 568 #define DHCPINFORM 8 569 570 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 571 572 static struct packet_type bootp_packet_type __initdata = { 573 .type = __constant_htons(ETH_P_IP), 574 .func = ic_bootp_recv, 575 }; 576 577 578 /* 579 * Initialize DHCP/BOOTP extension fields in the request. 580 */ 581 582 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 583 584 #ifdef IPCONFIG_DHCP 585 586 static void __init 587 ic_dhcp_init_options(u8 *options) 588 { 589 u8 mt = ((ic_servaddr == NONE) 590 ? DHCPDISCOVER : DHCPREQUEST); 591 u8 *e = options; 592 int len; 593 594 #ifdef IPCONFIG_DEBUG 595 printk("DHCP: Sending message type %d\n", mt); 596 #endif 597 598 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 599 e += 4; 600 601 *e++ = 53; /* DHCP message type */ 602 *e++ = 1; 603 *e++ = mt; 604 605 if (mt == DHCPREQUEST) { 606 *e++ = 54; /* Server ID (IP address) */ 607 *e++ = 4; 608 memcpy(e, &ic_servaddr, 4); 609 e += 4; 610 611 *e++ = 50; /* Requested IP address */ 612 *e++ = 4; 613 memcpy(e, &ic_myaddr, 4); 614 e += 4; 615 } 616 617 /* always? */ 618 { 619 static const u8 ic_req_params[] = { 620 1, /* Subnet mask */ 621 3, /* Default gateway */ 622 6, /* DNS server */ 623 12, /* Host name */ 624 15, /* Domain name */ 625 17, /* Boot path */ 626 40, /* NIS domain name */ 627 }; 628 629 *e++ = 55; /* Parameter request list */ 630 *e++ = sizeof(ic_req_params); 631 memcpy(e, ic_req_params, sizeof(ic_req_params)); 632 e += sizeof(ic_req_params); 633 634 if (*vendor_class_identifier) { 635 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n", 636 vendor_class_identifier); 637 *e++ = 60; /* Class-identifier */ 638 len = strlen(vendor_class_identifier); 639 *e++ = len; 640 memcpy(e, vendor_class_identifier, len); 641 e += len; 642 } 643 } 644 645 *e++ = 255; /* End of the list */ 646 } 647 648 #endif /* IPCONFIG_DHCP */ 649 650 static void __init ic_bootp_init_ext(u8 *e) 651 { 652 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 653 e += 4; 654 *e++ = 1; /* Subnet mask request */ 655 *e++ = 4; 656 e += 4; 657 *e++ = 3; /* Default gateway request */ 658 *e++ = 4; 659 e += 4; 660 *e++ = 5; /* Name server request */ 661 *e++ = 8; 662 e += 8; 663 *e++ = 12; /* Host name request */ 664 *e++ = 32; 665 e += 32; 666 *e++ = 40; /* NIS Domain name request */ 667 *e++ = 32; 668 e += 32; 669 *e++ = 17; /* Boot path */ 670 *e++ = 40; 671 e += 40; 672 673 *e++ = 57; /* set extension buffer size for reply */ 674 *e++ = 2; 675 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 676 *e++ = 150; 677 678 *e++ = 255; /* End of the list */ 679 } 680 681 682 /* 683 * Initialize the DHCP/BOOTP mechanism. 684 */ 685 static inline void ic_bootp_init(void) 686 { 687 int i; 688 689 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 690 ic_nameservers[i] = NONE; 691 692 dev_add_pack(&bootp_packet_type); 693 } 694 695 696 /* 697 * DHCP/BOOTP cleanup. 698 */ 699 static inline void ic_bootp_cleanup(void) 700 { 701 dev_remove_pack(&bootp_packet_type); 702 } 703 704 705 /* 706 * Send DHCP/BOOTP request to single interface. 707 */ 708 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 709 { 710 struct net_device *dev = d->dev; 711 struct sk_buff *skb; 712 struct bootp_pkt *b; 713 int hh_len = LL_RESERVED_SPACE(dev); 714 struct iphdr *h; 715 716 /* Allocate packet */ 717 skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL); 718 if (!skb) 719 return; 720 skb_reserve(skb, hh_len); 721 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 722 memset(b, 0, sizeof(struct bootp_pkt)); 723 724 /* Construct IP header */ 725 skb_reset_network_header(skb); 726 h = ip_hdr(skb); 727 h->version = 4; 728 h->ihl = 5; 729 h->tot_len = htons(sizeof(struct bootp_pkt)); 730 h->frag_off = htons(IP_DF); 731 h->ttl = 64; 732 h->protocol = IPPROTO_UDP; 733 h->daddr = htonl(INADDR_BROADCAST); 734 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 735 736 /* Construct UDP header */ 737 b->udph.source = htons(68); 738 b->udph.dest = htons(67); 739 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 740 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 741 742 /* Construct DHCP/BOOTP header */ 743 b->op = BOOTP_REQUEST; 744 if (dev->type < 256) /* check for false types */ 745 b->htype = dev->type; 746 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ 747 b->htype = ARPHRD_IEEE802; 748 else if (dev->type == ARPHRD_FDDI) 749 b->htype = ARPHRD_ETHER; 750 else { 751 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 752 b->htype = dev->type; /* can cause undefined behavior */ 753 } 754 755 /* server_ip and your_ip address are both already zero per RFC2131 */ 756 b->hlen = dev->addr_len; 757 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 758 b->secs = htons(jiffies_diff / HZ); 759 b->xid = d->xid; 760 761 /* add DHCP options or BOOTP extensions */ 762 #ifdef IPCONFIG_DHCP 763 if (ic_proto_enabled & IC_USE_DHCP) 764 ic_dhcp_init_options(b->exten); 765 else 766 #endif 767 ic_bootp_init_ext(b->exten); 768 769 /* Chain packet down the line... */ 770 skb->dev = dev; 771 skb->protocol = htons(ETH_P_IP); 772 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 773 dev->broadcast, dev->dev_addr, skb->len) < 0 || 774 dev_queue_xmit(skb) < 0) 775 printk("E"); 776 } 777 778 779 /* 780 * Copy BOOTP-supplied string if not already set. 781 */ 782 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 783 { 784 if (!len) 785 return 0; 786 if (len > max-1) 787 len = max-1; 788 memcpy(dest, src, len); 789 dest[len] = '\0'; 790 return 1; 791 } 792 793 794 /* 795 * Process BOOTP extensions. 796 */ 797 static void __init ic_do_bootp_ext(u8 *ext) 798 { 799 u8 servers; 800 int i; 801 802 #ifdef IPCONFIG_DEBUG 803 u8 *c; 804 805 printk("DHCP/BOOTP: Got extension %d:",*ext); 806 for (c=ext+2; c<ext+2+ext[1]; c++) 807 printk(" %02x", *c); 808 printk("\n"); 809 #endif 810 811 switch (*ext++) { 812 case 1: /* Subnet mask */ 813 if (ic_netmask == NONE) 814 memcpy(&ic_netmask, ext+1, 4); 815 break; 816 case 3: /* Default gateway */ 817 if (ic_gateway == NONE) 818 memcpy(&ic_gateway, ext+1, 4); 819 break; 820 case 6: /* DNS server */ 821 servers= *ext/4; 822 if (servers > CONF_NAMESERVERS_MAX) 823 servers = CONF_NAMESERVERS_MAX; 824 for (i = 0; i < servers; i++) { 825 if (ic_nameservers[i] == NONE) 826 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 827 } 828 break; 829 case 12: /* Host name */ 830 ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN); 831 ic_host_name_set = 1; 832 break; 833 case 15: /* Domain name (DNS) */ 834 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 835 break; 836 case 17: /* Root path */ 837 if (!root_server_path[0]) 838 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path)); 839 break; 840 case 40: /* NIS Domain name (_not_ DNS) */ 841 ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN); 842 break; 843 } 844 } 845 846 847 /* 848 * Receive BOOTP reply. 849 */ 850 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 851 { 852 struct bootp_pkt *b; 853 struct iphdr *h; 854 struct ic_device *d; 855 int len, ext_len; 856 857 if (dev_net(dev) != &init_net) 858 goto drop; 859 860 /* Perform verifications before taking the lock. */ 861 if (skb->pkt_type == PACKET_OTHERHOST) 862 goto drop; 863 864 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 865 return NET_RX_DROP; 866 867 if (!pskb_may_pull(skb, 868 sizeof(struct iphdr) + 869 sizeof(struct udphdr))) 870 goto drop; 871 872 b = (struct bootp_pkt *)skb_network_header(skb); 873 h = &b->iph; 874 875 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 876 goto drop; 877 878 /* Fragments are not supported */ 879 if (h->frag_off & htons(IP_OFFSET | IP_MF)) { 880 if (net_ratelimit()) 881 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " 882 "reply.\n"); 883 goto drop; 884 } 885 886 if (skb->len < ntohs(h->tot_len)) 887 goto drop; 888 889 if (ip_fast_csum((char *) h, h->ihl)) 890 goto drop; 891 892 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 893 goto drop; 894 895 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 896 goto drop; 897 898 len = ntohs(b->udph.len) - sizeof(struct udphdr); 899 ext_len = len - (sizeof(*b) - 900 sizeof(struct iphdr) - 901 sizeof(struct udphdr) - 902 sizeof(b->exten)); 903 if (ext_len < 0) 904 goto drop; 905 906 /* Ok the front looks good, make sure we can get at the rest. */ 907 if (!pskb_may_pull(skb, skb->len)) 908 goto drop; 909 910 b = (struct bootp_pkt *)skb_network_header(skb); 911 h = &b->iph; 912 913 /* One reply at a time, please. */ 914 spin_lock(&ic_recv_lock); 915 916 /* If we already have a reply, just drop the packet */ 917 if (ic_got_reply) 918 goto drop_unlock; 919 920 /* Find the ic_device that the packet arrived on */ 921 d = ic_first_dev; 922 while (d && d->dev != dev) 923 d = d->next; 924 if (!d) 925 goto drop_unlock; /* should never happen */ 926 927 /* Is it a reply to our BOOTP request? */ 928 if (b->op != BOOTP_REPLY || 929 b->xid != d->xid) { 930 if (net_ratelimit()) 931 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " 932 "op[%x] xid[%x]\n", 933 b->op, b->xid); 934 goto drop_unlock; 935 } 936 937 /* Parse extensions */ 938 if (ext_len >= 4 && 939 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 940 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 941 u8 *ext; 942 943 #ifdef IPCONFIG_DHCP 944 if (ic_proto_enabled & IC_USE_DHCP) { 945 __be32 server_id = NONE; 946 int mt = 0; 947 948 ext = &b->exten[4]; 949 while (ext < end && *ext != 0xff) { 950 u8 *opt = ext++; 951 if (*opt == 0) /* Padding */ 952 continue; 953 ext += *ext + 1; 954 if (ext >= end) 955 break; 956 switch (*opt) { 957 case 53: /* Message type */ 958 if (opt[1]) 959 mt = opt[2]; 960 break; 961 case 54: /* Server ID (IP address) */ 962 if (opt[1] >= 4) 963 memcpy(&server_id, opt + 2, 4); 964 break; 965 } 966 } 967 968 #ifdef IPCONFIG_DEBUG 969 printk("DHCP: Got message type %d\n", mt); 970 #endif 971 972 switch (mt) { 973 case DHCPOFFER: 974 /* While in the process of accepting one offer, 975 * ignore all others. 976 */ 977 if (ic_myaddr != NONE) 978 goto drop_unlock; 979 980 /* Let's accept that offer. */ 981 ic_myaddr = b->your_ip; 982 ic_servaddr = server_id; 983 #ifdef IPCONFIG_DEBUG 984 printk("DHCP: Offered address " NIPQUAD_FMT, 985 NIPQUAD(ic_myaddr)); 986 printk(" by server " NIPQUAD_FMT "\n", 987 NIPQUAD(ic_servaddr)); 988 #endif 989 /* The DHCP indicated server address takes 990 * precedence over the bootp header one if 991 * they are different. 992 */ 993 if ((server_id != NONE) && 994 (b->server_ip != server_id)) 995 b->server_ip = ic_servaddr; 996 break; 997 998 case DHCPACK: 999 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1000 goto drop_unlock; 1001 1002 /* Yeah! */ 1003 break; 1004 1005 default: 1006 /* Urque. Forget it*/ 1007 ic_myaddr = NONE; 1008 ic_servaddr = NONE; 1009 goto drop_unlock; 1010 } 1011 1012 ic_dhcp_msgtype = mt; 1013 1014 } 1015 #endif /* IPCONFIG_DHCP */ 1016 1017 ext = &b->exten[4]; 1018 while (ext < end && *ext != 0xff) { 1019 u8 *opt = ext++; 1020 if (*opt == 0) /* Padding */ 1021 continue; 1022 ext += *ext + 1; 1023 if (ext < end) 1024 ic_do_bootp_ext(opt); 1025 } 1026 } 1027 1028 /* We have a winner! */ 1029 ic_dev = dev; 1030 ic_myaddr = b->your_ip; 1031 ic_servaddr = b->server_ip; 1032 if (ic_gateway == NONE && b->relay_ip) 1033 ic_gateway = b->relay_ip; 1034 if (ic_nameservers[0] == NONE) 1035 ic_nameservers[0] = ic_servaddr; 1036 ic_got_reply = IC_BOOTP; 1037 1038 drop_unlock: 1039 /* Show's over. Nothing to see here. */ 1040 spin_unlock(&ic_recv_lock); 1041 1042 drop: 1043 /* Throw the packet out. */ 1044 kfree_skb(skb); 1045 1046 return 0; 1047 } 1048 1049 1050 #endif 1051 1052 1053 /* 1054 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1055 */ 1056 1057 #ifdef IPCONFIG_DYNAMIC 1058 1059 static int __init ic_dynamic(void) 1060 { 1061 int retries; 1062 struct ic_device *d; 1063 unsigned long start_jiffies, timeout, jiff; 1064 int do_bootp = ic_proto_have_if & IC_BOOTP; 1065 int do_rarp = ic_proto_have_if & IC_RARP; 1066 1067 /* 1068 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1069 * This routine gets only called when some pieces of information 1070 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1071 */ 1072 if (!ic_proto_enabled) { 1073 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1074 return -1; 1075 } 1076 1077 #ifdef IPCONFIG_BOOTP 1078 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1079 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); 1080 #endif 1081 #ifdef IPCONFIG_RARP 1082 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1083 printk(KERN_ERR "RARP: No suitable device found.\n"); 1084 #endif 1085 1086 if (!ic_proto_have_if) 1087 /* Error message already printed */ 1088 return -1; 1089 1090 /* 1091 * Setup protocols 1092 */ 1093 #ifdef IPCONFIG_BOOTP 1094 if (do_bootp) 1095 ic_bootp_init(); 1096 #endif 1097 #ifdef IPCONFIG_RARP 1098 if (do_rarp) 1099 ic_rarp_init(); 1100 #endif 1101 1102 /* 1103 * Send requests and wait, until we get an answer. This loop 1104 * seems to be a terrible waste of CPU time, but actually there is 1105 * only one process running at all, so we don't need to use any 1106 * scheduler functions. 1107 * [Actually we could now, but the nothing else running note still 1108 * applies.. - AC] 1109 */ 1110 printk(KERN_NOTICE "Sending %s%s%s requests .", 1111 do_bootp 1112 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1113 (do_bootp && do_rarp) ? " and " : "", 1114 do_rarp ? "RARP" : ""); 1115 1116 start_jiffies = jiffies; 1117 d = ic_first_dev; 1118 retries = CONF_SEND_RETRIES; 1119 get_random_bytes(&timeout, sizeof(timeout)); 1120 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); 1121 for (;;) { 1122 #ifdef IPCONFIG_BOOTP 1123 if (do_bootp && (d->able & IC_BOOTP)) 1124 ic_bootp_send_if(d, jiffies - start_jiffies); 1125 #endif 1126 #ifdef IPCONFIG_RARP 1127 if (do_rarp && (d->able & IC_RARP)) 1128 ic_rarp_send_if(d); 1129 #endif 1130 1131 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1132 while (time_before(jiffies, jiff) && !ic_got_reply) 1133 schedule_timeout_uninterruptible(1); 1134 #ifdef IPCONFIG_DHCP 1135 /* DHCP isn't done until we get a DHCPACK. */ 1136 if ((ic_got_reply & IC_BOOTP) 1137 && (ic_proto_enabled & IC_USE_DHCP) 1138 && ic_dhcp_msgtype != DHCPACK) 1139 { 1140 ic_got_reply = 0; 1141 printk(","); 1142 continue; 1143 } 1144 #endif /* IPCONFIG_DHCP */ 1145 1146 if (ic_got_reply) { 1147 printk(" OK\n"); 1148 break; 1149 } 1150 1151 if ((d = d->next)) 1152 continue; 1153 1154 if (! --retries) { 1155 printk(" timed out!\n"); 1156 break; 1157 } 1158 1159 d = ic_first_dev; 1160 1161 timeout = timeout CONF_TIMEOUT_MULT; 1162 if (timeout > CONF_TIMEOUT_MAX) 1163 timeout = CONF_TIMEOUT_MAX; 1164 1165 printk("."); 1166 } 1167 1168 #ifdef IPCONFIG_BOOTP 1169 if (do_bootp) 1170 ic_bootp_cleanup(); 1171 #endif 1172 #ifdef IPCONFIG_RARP 1173 if (do_rarp) 1174 ic_rarp_cleanup(); 1175 #endif 1176 1177 if (!ic_got_reply) { 1178 ic_myaddr = NONE; 1179 return -1; 1180 } 1181 1182 printk("IP-Config: Got %s answer from " NIPQUAD_FMT ", ", 1183 ((ic_got_reply & IC_RARP) ? "RARP" 1184 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1185 NIPQUAD(ic_servaddr)); 1186 printk("my address is " NIPQUAD_FMT "\n", NIPQUAD(ic_myaddr)); 1187 1188 return 0; 1189 } 1190 1191 #endif /* IPCONFIG_DYNAMIC */ 1192 1193 #ifdef CONFIG_PROC_FS 1194 1195 static int pnp_seq_show(struct seq_file *seq, void *v) 1196 { 1197 int i; 1198 1199 if (ic_proto_used & IC_PROTO) 1200 seq_printf(seq, "#PROTO: %s\n", 1201 (ic_proto_used & IC_RARP) ? "RARP" 1202 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1203 else 1204 seq_puts(seq, "#MANUAL\n"); 1205 1206 if (ic_domain[0]) 1207 seq_printf(seq, 1208 "domain %s\n", ic_domain); 1209 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1210 if (ic_nameservers[i] != NONE) 1211 seq_printf(seq, 1212 "nameserver " NIPQUAD_FMT "\n", 1213 NIPQUAD(ic_nameservers[i])); 1214 } 1215 if (ic_servaddr != NONE) 1216 seq_printf(seq, 1217 "bootserver " NIPQUAD_FMT "\n", 1218 NIPQUAD(ic_servaddr)); 1219 return 0; 1220 } 1221 1222 static int pnp_seq_open(struct inode *indoe, struct file *file) 1223 { 1224 return single_open(file, pnp_seq_show, NULL); 1225 } 1226 1227 static const struct file_operations pnp_seq_fops = { 1228 .owner = THIS_MODULE, 1229 .open = pnp_seq_open, 1230 .read = seq_read, 1231 .llseek = seq_lseek, 1232 .release = single_release, 1233 }; 1234 #endif /* CONFIG_PROC_FS */ 1235 1236 /* 1237 * Extract IP address from the parameter string if needed. Note that we 1238 * need to have root_server_addr set _before_ IPConfig gets called as it 1239 * can override it. 1240 */ 1241 __be32 __init root_nfs_parse_addr(char *name) 1242 { 1243 __be32 addr; 1244 int octets = 0; 1245 char *cp, *cq; 1246 1247 cp = cq = name; 1248 while (octets < 4) { 1249 while (*cp >= '0' && *cp <= '9') 1250 cp++; 1251 if (cp == cq || cp - cq > 3) 1252 break; 1253 if (*cp == '.' || octets == 3) 1254 octets++; 1255 if (octets < 4) 1256 cp++; 1257 cq = cp; 1258 } 1259 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1260 if (*cp == ':') 1261 *cp++ = '\0'; 1262 addr = in_aton(name); 1263 memmove(name, cp, strlen(cp) + 1); 1264 } else 1265 addr = NONE; 1266 1267 return addr; 1268 } 1269 1270 /* 1271 * IP Autoconfig dispatcher. 1272 */ 1273 1274 static int __init ip_auto_config(void) 1275 { 1276 __be32 addr; 1277 1278 #ifdef CONFIG_PROC_FS 1279 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops); 1280 #endif /* CONFIG_PROC_FS */ 1281 1282 if (!ic_enable) 1283 return 0; 1284 1285 DBG(("IP-Config: Entered.\n")); 1286 #ifdef IPCONFIG_DYNAMIC 1287 try_try_again: 1288 #endif 1289 /* Give hardware a chance to settle */ 1290 msleep(CONF_PRE_OPEN); 1291 1292 /* Setup all network devices */ 1293 if (ic_open_devs() < 0) 1294 return -1; 1295 1296 /* Give drivers a chance to settle */ 1297 ssleep(CONF_POST_OPEN); 1298 1299 /* 1300 * If the config information is insufficient (e.g., our IP address or 1301 * IP address of the boot server is missing or we have multiple network 1302 * interfaces and no default was set), use BOOTP or RARP to get the 1303 * missing values. 1304 */ 1305 if (ic_myaddr == NONE || 1306 #ifdef CONFIG_ROOT_NFS 1307 (root_server_addr == NONE 1308 && ic_servaddr == NONE 1309 && ROOT_DEV == Root_NFS) || 1310 #endif 1311 ic_first_dev->next) { 1312 #ifdef IPCONFIG_DYNAMIC 1313 1314 int retries = CONF_OPEN_RETRIES; 1315 1316 if (ic_dynamic() < 0) { 1317 ic_close_devs(); 1318 1319 /* 1320 * I don't know why, but sometimes the 1321 * eepro100 driver (at least) gets upset and 1322 * doesn't work the first time it's opened. 1323 * But then if you close it and reopen it, it 1324 * works just fine. So we need to try that at 1325 * least once before giving up. 1326 * 1327 * Also, if the root will be NFS-mounted, we 1328 * have nowhere to go if DHCP fails. So we 1329 * just have to keep trying forever. 1330 * 1331 * -- Chip 1332 */ 1333 #ifdef CONFIG_ROOT_NFS 1334 if (ROOT_DEV == Root_NFS) { 1335 printk(KERN_ERR 1336 "IP-Config: Retrying forever (NFS root)...\n"); 1337 goto try_try_again; 1338 } 1339 #endif 1340 1341 if (--retries) { 1342 printk(KERN_ERR 1343 "IP-Config: Reopening network devices...\n"); 1344 goto try_try_again; 1345 } 1346 1347 /* Oh, well. At least we tried. */ 1348 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); 1349 return -1; 1350 } 1351 #else /* !DYNAMIC */ 1352 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1353 ic_close_devs(); 1354 return -1; 1355 #endif /* IPCONFIG_DYNAMIC */ 1356 } else { 1357 /* Device selected manually or only one device -> use it */ 1358 ic_dev = ic_first_dev->dev; 1359 } 1360 1361 addr = root_nfs_parse_addr(root_server_path); 1362 if (root_server_addr == NONE) 1363 root_server_addr = addr; 1364 1365 /* 1366 * Use defaults whereever applicable. 1367 */ 1368 if (ic_defaults() < 0) 1369 return -1; 1370 1371 /* 1372 * Close all network devices except the device we've 1373 * autoconfigured and set up routes. 1374 */ 1375 ic_close_devs(); 1376 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1377 return -1; 1378 1379 /* 1380 * Record which protocol was actually used. 1381 */ 1382 #ifdef IPCONFIG_DYNAMIC 1383 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1384 #endif 1385 1386 #ifndef IPCONFIG_SILENT 1387 /* 1388 * Clue in the operator. 1389 */ 1390 printk("IP-Config: Complete:"); 1391 printk("\n device=%s", ic_dev->name); 1392 printk(", addr=" NIPQUAD_FMT, NIPQUAD(ic_myaddr)); 1393 printk(", mask=" NIPQUAD_FMT, NIPQUAD(ic_netmask)); 1394 printk(", gw=" NIPQUAD_FMT, NIPQUAD(ic_gateway)); 1395 printk(",\n host=%s, domain=%s, nis-domain=%s", 1396 utsname()->nodename, ic_domain, utsname()->domainname); 1397 printk(",\n bootserver=" NIPQUAD_FMT, NIPQUAD(ic_servaddr)); 1398 printk(", rootserver=" NIPQUAD_FMT, NIPQUAD(root_server_addr)); 1399 printk(", rootpath=%s", root_server_path); 1400 printk("\n"); 1401 #endif /* !SILENT */ 1402 1403 return 0; 1404 } 1405 1406 late_initcall(ip_auto_config); 1407 1408 1409 /* 1410 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1411 * command line parameter. See Documentation/filesystems/nfsroot.txt. 1412 */ 1413 static int __init ic_proto_name(char *name) 1414 { 1415 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1416 return 1; 1417 } 1418 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1419 return 0; 1420 } 1421 #ifdef CONFIG_IP_PNP_DHCP 1422 else if (!strcmp(name, "dhcp")) { 1423 ic_proto_enabled &= ~IC_RARP; 1424 return 1; 1425 } 1426 #endif 1427 #ifdef CONFIG_IP_PNP_BOOTP 1428 else if (!strcmp(name, "bootp")) { 1429 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1430 return 1; 1431 } 1432 #endif 1433 #ifdef CONFIG_IP_PNP_RARP 1434 else if (!strcmp(name, "rarp")) { 1435 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1436 return 1; 1437 } 1438 #endif 1439 #ifdef IPCONFIG_DYNAMIC 1440 else if (!strcmp(name, "both")) { 1441 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1442 return 1; 1443 } 1444 #endif 1445 return 0; 1446 } 1447 1448 static int __init ip_auto_config_setup(char *addrs) 1449 { 1450 char *cp, *ip, *dp; 1451 int num = 0; 1452 1453 ic_set_manually = 1; 1454 ic_enable = 1; 1455 1456 /* 1457 * If any dhcp, bootp etc options are set, leave autoconfig on 1458 * and skip the below static IP processing. 1459 */ 1460 if (ic_proto_name(addrs)) 1461 return 1; 1462 1463 /* If no static IP is given, turn off autoconfig and bail. */ 1464 if (*addrs == 0 || 1465 strcmp(addrs, "off") == 0 || 1466 strcmp(addrs, "none") == 0) { 1467 ic_enable = 0; 1468 return 1; 1469 } 1470 1471 /* Parse string for static IP assignment. */ 1472 ip = addrs; 1473 while (ip && *ip) { 1474 if ((cp = strchr(ip, ':'))) 1475 *cp++ = '\0'; 1476 if (strlen(ip) > 0) { 1477 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); 1478 switch (num) { 1479 case 0: 1480 if ((ic_myaddr = in_aton(ip)) == ANY) 1481 ic_myaddr = NONE; 1482 break; 1483 case 1: 1484 if ((ic_servaddr = in_aton(ip)) == ANY) 1485 ic_servaddr = NONE; 1486 break; 1487 case 2: 1488 if ((ic_gateway = in_aton(ip)) == ANY) 1489 ic_gateway = NONE; 1490 break; 1491 case 3: 1492 if ((ic_netmask = in_aton(ip)) == ANY) 1493 ic_netmask = NONE; 1494 break; 1495 case 4: 1496 if ((dp = strchr(ip, '.'))) { 1497 *dp++ = '\0'; 1498 strlcpy(utsname()->domainname, dp, 1499 sizeof(utsname()->domainname)); 1500 } 1501 strlcpy(utsname()->nodename, ip, 1502 sizeof(utsname()->nodename)); 1503 ic_host_name_set = 1; 1504 break; 1505 case 5: 1506 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1507 break; 1508 case 6: 1509 if (ic_proto_name(ip) == 0 && 1510 ic_myaddr == NONE) { 1511 ic_enable = 0; 1512 } 1513 break; 1514 } 1515 } 1516 ip = cp; 1517 num++; 1518 } 1519 1520 return 1; 1521 } 1522 1523 static int __init nfsaddrs_config_setup(char *addrs) 1524 { 1525 return ip_auto_config_setup(addrs); 1526 } 1527 1528 static int __init vendor_class_identifier_setup(char *addrs) 1529 { 1530 if (strlcpy(vendor_class_identifier, addrs, 1531 sizeof(vendor_class_identifier)) 1532 >= sizeof(vendor_class_identifier)) 1533 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"", 1534 vendor_class_identifier); 1535 return 1; 1536 } 1537 1538 __setup("ip=", ip_auto_config_setup); 1539 __setup("nfsaddrs=", nfsaddrs_config_setup); 1540 __setup("dhcpclass=", vendor_class_identifier_setup); 1541