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