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/config.h> 35 #include <linux/types.h> 36 #include <linux/string.h> 37 #include <linux/kernel.h> 38 #include <linux/jiffies.h> 39 #include <linux/random.h> 40 #include <linux/init.h> 41 #include <linux/utsname.h> 42 #include <linux/in.h> 43 #include <linux/if.h> 44 #include <linux/inet.h> 45 #include <linux/inetdevice.h> 46 #include <linux/netdevice.h> 47 #include <linux/if_arp.h> 48 #include <linux/skbuff.h> 49 #include <linux/ip.h> 50 #include <linux/socket.h> 51 #include <linux/route.h> 52 #include <linux/udp.h> 53 #include <linux/proc_fs.h> 54 #include <linux/seq_file.h> 55 #include <linux/major.h> 56 #include <linux/root_dev.h> 57 #include <linux/delay.h> 58 #include <linux/nfs_fs.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 */ 104 105 106 /* 107 * Public IP configuration 108 */ 109 110 /* This is used by platforms which might be able to set the ipconfig 111 * variables using firmware environment vars. If this is set, it will 112 * ignore such firmware variables. 113 */ 114 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ 115 116 static int ic_enable __initdata = 0; /* IP config enabled? */ 117 118 /* Protocol choice */ 119 int ic_proto_enabled __initdata = 0 120 #ifdef IPCONFIG_BOOTP 121 | IC_BOOTP 122 #endif 123 #ifdef CONFIG_IP_PNP_DHCP 124 | IC_USE_DHCP 125 #endif 126 #ifdef IPCONFIG_RARP 127 | IC_RARP 128 #endif 129 ; 130 131 static int ic_host_name_set __initdata = 0; /* Host name set by us? */ 132 133 u32 ic_myaddr = INADDR_NONE; /* My IP address */ 134 static u32 ic_netmask = INADDR_NONE; /* Netmask for local subnet */ 135 u32 ic_gateway = INADDR_NONE; /* Gateway IP address */ 136 137 u32 ic_servaddr = INADDR_NONE; /* Boot server IP address */ 138 139 u32 root_server_addr = INADDR_NONE; /* Address of NFS server */ 140 u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 141 142 /* Persistent data: */ 143 144 static int ic_proto_used; /* Protocol used, if any */ 145 static u32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 146 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 147 148 /* 149 * Private state. 150 */ 151 152 /* Name of user-selected boot device */ 153 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 154 155 /* Protocols supported by available interfaces */ 156 static int ic_proto_have_if __initdata = 0; 157 158 #ifdef IPCONFIG_DYNAMIC 159 static DEFINE_SPINLOCK(ic_recv_lock); 160 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */ 161 #endif 162 #ifdef IPCONFIG_DHCP 163 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */ 164 #endif 165 166 167 /* 168 * Network devices 169 */ 170 171 struct ic_device { 172 struct ic_device *next; 173 struct net_device *dev; 174 unsigned short flags; 175 short able; 176 u32 xid; 177 }; 178 179 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */ 180 static struct net_device *ic_dev __initdata = NULL; /* Selected device */ 181 182 static int __init ic_open_devs(void) 183 { 184 struct ic_device *d, **last; 185 struct net_device *dev; 186 unsigned short oflags; 187 188 last = &ic_first_dev; 189 rtnl_lock(); 190 191 /* bring loopback device up first */ 192 if (dev_change_flags(&loopback_dev, loopback_dev.flags | IFF_UP) < 0) 193 printk(KERN_ERR "IP-Config: Failed to open %s\n", loopback_dev.name); 194 195 for (dev = dev_base; dev; dev = dev->next) { 196 if (dev == &loopback_dev) 197 continue; 198 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 199 (!(dev->flags & IFF_LOOPBACK) && 200 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 201 strncmp(dev->name, "dummy", 5))) { 202 int able = 0; 203 if (dev->mtu >= 364) 204 able |= IC_BOOTP; 205 else 206 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu); 207 if (!(dev->flags & IFF_NOARP)) 208 able |= IC_RARP; 209 able &= ic_proto_enabled; 210 if (ic_proto_enabled && !able) 211 continue; 212 oflags = dev->flags; 213 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 214 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); 215 continue; 216 } 217 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 218 rtnl_unlock(); 219 return -1; 220 } 221 d->dev = dev; 222 *last = d; 223 last = &d->next; 224 d->flags = oflags; 225 d->able = able; 226 if (able & IC_BOOTP) 227 get_random_bytes(&d->xid, sizeof(u32)); 228 else 229 d->xid = 0; 230 ic_proto_have_if |= able; 231 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", 232 dev->name, able, d->xid)); 233 } 234 } 235 rtnl_unlock(); 236 237 *last = NULL; 238 239 if (!ic_first_dev) { 240 if (user_dev_name[0]) 241 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name); 242 else 243 printk(KERN_ERR "IP-Config: No network devices available.\n"); 244 return -1; 245 } 246 return 0; 247 } 248 249 static void __init ic_close_devs(void) 250 { 251 struct ic_device *d, *next; 252 struct net_device *dev; 253 254 rtnl_lock(); 255 next = ic_first_dev; 256 while ((d = next)) { 257 next = d->next; 258 dev = d->dev; 259 if (dev != ic_dev) { 260 DBG(("IP-Config: Downing %s\n", dev->name)); 261 dev_change_flags(dev, d->flags); 262 } 263 kfree(d); 264 } 265 rtnl_unlock(); 266 } 267 268 /* 269 * Interface to various network functions. 270 */ 271 272 static inline void 273 set_sockaddr(struct sockaddr_in *sin, u32 addr, u16 port) 274 { 275 sin->sin_family = AF_INET; 276 sin->sin_addr.s_addr = addr; 277 sin->sin_port = port; 278 } 279 280 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 281 { 282 int res; 283 284 mm_segment_t oldfs = get_fs(); 285 set_fs(get_ds()); 286 res = devinet_ioctl(cmd, (struct ifreq __user *) arg); 287 set_fs(oldfs); 288 return res; 289 } 290 291 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 292 { 293 int res; 294 295 mm_segment_t oldfs = get_fs(); 296 set_fs(get_ds()); 297 res = ip_rt_ioctl(cmd, (void __user *) arg); 298 set_fs(oldfs); 299 return res; 300 } 301 302 /* 303 * Set up interface addresses and routes. 304 */ 305 306 static int __init ic_setup_if(void) 307 { 308 struct ifreq ir; 309 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 310 int err; 311 312 memset(&ir, 0, sizeof(ir)); 313 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); 314 set_sockaddr(sin, ic_myaddr, 0); 315 if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) { 316 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err); 317 return -1; 318 } 319 set_sockaddr(sin, ic_netmask, 0); 320 if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 321 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err); 322 return -1; 323 } 324 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 325 if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 326 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err); 327 return -1; 328 } 329 return 0; 330 } 331 332 static int __init ic_setup_routes(void) 333 { 334 /* No need to setup device routes, only the default route... */ 335 336 if (ic_gateway != INADDR_NONE) { 337 struct rtentry rm; 338 int err; 339 340 memset(&rm, 0, sizeof(rm)); 341 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 342 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n"); 343 return -1; 344 } 345 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 346 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 347 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 348 rm.rt_flags = RTF_UP | RTF_GATEWAY; 349 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 350 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err); 351 return -1; 352 } 353 } 354 355 return 0; 356 } 357 358 /* 359 * Fill in default values for all missing parameters. 360 */ 361 362 static int __init ic_defaults(void) 363 { 364 /* 365 * At this point we have no userspace running so need not 366 * claim locks on system_utsname 367 */ 368 369 if (!ic_host_name_set) 370 sprintf(system_utsname.nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr)); 371 372 if (root_server_addr == INADDR_NONE) 373 root_server_addr = ic_servaddr; 374 375 if (ic_netmask == INADDR_NONE) { 376 if (IN_CLASSA(ntohl(ic_myaddr))) 377 ic_netmask = htonl(IN_CLASSA_NET); 378 else if (IN_CLASSB(ntohl(ic_myaddr))) 379 ic_netmask = htonl(IN_CLASSB_NET); 380 else if (IN_CLASSC(ntohl(ic_myaddr))) 381 ic_netmask = htonl(IN_CLASSC_NET); 382 else { 383 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n", 384 NIPQUAD(ic_myaddr)); 385 return -1; 386 } 387 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask)); 388 } 389 390 return 0; 391 } 392 393 /* 394 * RARP support. 395 */ 396 397 #ifdef IPCONFIG_RARP 398 399 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 400 401 static struct packet_type rarp_packet_type __initdata = { 402 .type = __constant_htons(ETH_P_RARP), 403 .func = ic_rarp_recv, 404 }; 405 406 static inline void ic_rarp_init(void) 407 { 408 dev_add_pack(&rarp_packet_type); 409 } 410 411 static inline void ic_rarp_cleanup(void) 412 { 413 dev_remove_pack(&rarp_packet_type); 414 } 415 416 /* 417 * Process received RARP packet. 418 */ 419 static int __init 420 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 421 { 422 struct arphdr *rarp; 423 unsigned char *rarp_ptr; 424 unsigned long sip, tip; 425 unsigned char *sha, *tha; /* s for "source", t for "target" */ 426 struct ic_device *d; 427 428 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 429 return NET_RX_DROP; 430 431 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 432 goto drop; 433 434 /* Basic sanity checks can be done without the lock. */ 435 rarp = (struct arphdr *)skb->h.raw; 436 437 /* If this test doesn't pass, it's not IP, or we should 438 * ignore it anyway. 439 */ 440 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 441 goto drop; 442 443 /* If it's not a RARP reply, delete it. */ 444 if (rarp->ar_op != htons(ARPOP_RREPLY)) 445 goto drop; 446 447 /* If it's not Ethernet, delete it. */ 448 if (rarp->ar_pro != htons(ETH_P_IP)) 449 goto drop; 450 451 if (!pskb_may_pull(skb, 452 sizeof(struct arphdr) + 453 (2 * dev->addr_len) + 454 (2 * 4))) 455 goto drop; 456 457 /* OK, it is all there and looks valid, process... */ 458 rarp = (struct arphdr *)skb->h.raw; 459 rarp_ptr = (unsigned char *) (rarp + 1); 460 461 /* One reply at a time, please. */ 462 spin_lock(&ic_recv_lock); 463 464 /* If we already have a reply, just drop the packet */ 465 if (ic_got_reply) 466 goto drop_unlock; 467 468 /* Find the ic_device that the packet arrived on */ 469 d = ic_first_dev; 470 while (d && d->dev != dev) 471 d = d->next; 472 if (!d) 473 goto drop_unlock; /* should never happen */ 474 475 /* Extract variable-width fields */ 476 sha = rarp_ptr; 477 rarp_ptr += dev->addr_len; 478 memcpy(&sip, rarp_ptr, 4); 479 rarp_ptr += 4; 480 tha = rarp_ptr; 481 rarp_ptr += dev->addr_len; 482 memcpy(&tip, rarp_ptr, 4); 483 484 /* Discard packets which are not meant for us. */ 485 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 486 goto drop_unlock; 487 488 /* Discard packets which are not from specified server. */ 489 if (ic_servaddr != INADDR_NONE && ic_servaddr != sip) 490 goto drop_unlock; 491 492 /* We have a winner! */ 493 ic_dev = dev; 494 if (ic_myaddr == INADDR_NONE) 495 ic_myaddr = tip; 496 ic_servaddr = sip; 497 ic_got_reply = IC_RARP; 498 499 drop_unlock: 500 /* Show's over. Nothing to see here. */ 501 spin_unlock(&ic_recv_lock); 502 503 drop: 504 /* Throw the packet out. */ 505 kfree_skb(skb); 506 return 0; 507 } 508 509 510 /* 511 * Send RARP request packet over a single interface. 512 */ 513 static void __init ic_rarp_send_if(struct ic_device *d) 514 { 515 struct net_device *dev = d->dev; 516 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 517 dev->dev_addr, dev->dev_addr); 518 } 519 #endif 520 521 /* 522 * DHCP/BOOTP support. 523 */ 524 525 #ifdef IPCONFIG_BOOTP 526 527 struct bootp_pkt { /* BOOTP packet format */ 528 struct iphdr iph; /* IP header */ 529 struct udphdr udph; /* UDP header */ 530 u8 op; /* 1=request, 2=reply */ 531 u8 htype; /* HW address type */ 532 u8 hlen; /* HW address length */ 533 u8 hops; /* Used only by gateways */ 534 u32 xid; /* Transaction ID */ 535 u16 secs; /* Seconds since we started */ 536 u16 flags; /* Just what it says */ 537 u32 client_ip; /* Client's IP address if known */ 538 u32 your_ip; /* Assigned IP address */ 539 u32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 540 u32 relay_ip; /* IP address of BOOTP relay */ 541 u8 hw_addr[16]; /* Client's HW address */ 542 u8 serv_name[64]; /* Server host name */ 543 u8 boot_file[128]; /* Name of boot file */ 544 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 545 }; 546 547 /* packet ops */ 548 #define BOOTP_REQUEST 1 549 #define BOOTP_REPLY 2 550 551 /* DHCP message types */ 552 #define DHCPDISCOVER 1 553 #define DHCPOFFER 2 554 #define DHCPREQUEST 3 555 #define DHCPDECLINE 4 556 #define DHCPACK 5 557 #define DHCPNAK 6 558 #define DHCPRELEASE 7 559 #define DHCPINFORM 8 560 561 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 562 563 static struct packet_type bootp_packet_type __initdata = { 564 .type = __constant_htons(ETH_P_IP), 565 .func = ic_bootp_recv, 566 }; 567 568 569 /* 570 * Initialize DHCP/BOOTP extension fields in the request. 571 */ 572 573 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 574 575 #ifdef IPCONFIG_DHCP 576 577 static void __init 578 ic_dhcp_init_options(u8 *options) 579 { 580 u8 mt = ((ic_servaddr == INADDR_NONE) 581 ? DHCPDISCOVER : DHCPREQUEST); 582 u8 *e = options; 583 584 #ifdef IPCONFIG_DEBUG 585 printk("DHCP: Sending message type %d\n", mt); 586 #endif 587 588 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 589 e += 4; 590 591 *e++ = 53; /* DHCP message type */ 592 *e++ = 1; 593 *e++ = mt; 594 595 if (mt == DHCPREQUEST) { 596 *e++ = 54; /* Server ID (IP address) */ 597 *e++ = 4; 598 memcpy(e, &ic_servaddr, 4); 599 e += 4; 600 601 *e++ = 50; /* Requested IP address */ 602 *e++ = 4; 603 memcpy(e, &ic_myaddr, 4); 604 e += 4; 605 } 606 607 /* always? */ 608 { 609 static const u8 ic_req_params[] = { 610 1, /* Subnet mask */ 611 3, /* Default gateway */ 612 6, /* DNS server */ 613 12, /* Host name */ 614 15, /* Domain name */ 615 17, /* Boot path */ 616 40, /* NIS domain name */ 617 }; 618 619 *e++ = 55; /* Parameter request list */ 620 *e++ = sizeof(ic_req_params); 621 memcpy(e, ic_req_params, sizeof(ic_req_params)); 622 e += sizeof(ic_req_params); 623 } 624 625 *e++ = 255; /* End of the list */ 626 } 627 628 #endif /* IPCONFIG_DHCP */ 629 630 static void __init ic_bootp_init_ext(u8 *e) 631 { 632 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 633 e += 4; 634 *e++ = 1; /* Subnet mask request */ 635 *e++ = 4; 636 e += 4; 637 *e++ = 3; /* Default gateway request */ 638 *e++ = 4; 639 e += 4; 640 *e++ = 5; /* Name server request */ 641 *e++ = 8; 642 e += 8; 643 *e++ = 12; /* Host name request */ 644 *e++ = 32; 645 e += 32; 646 *e++ = 40; /* NIS Domain name request */ 647 *e++ = 32; 648 e += 32; 649 *e++ = 17; /* Boot path */ 650 *e++ = 40; 651 e += 40; 652 653 *e++ = 57; /* set extension buffer size for reply */ 654 *e++ = 2; 655 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 656 *e++ = 150; 657 658 *e++ = 255; /* End of the list */ 659 } 660 661 662 /* 663 * Initialize the DHCP/BOOTP mechanism. 664 */ 665 static inline void ic_bootp_init(void) 666 { 667 int i; 668 669 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 670 ic_nameservers[i] = INADDR_NONE; 671 672 dev_add_pack(&bootp_packet_type); 673 } 674 675 676 /* 677 * DHCP/BOOTP cleanup. 678 */ 679 static inline void ic_bootp_cleanup(void) 680 { 681 dev_remove_pack(&bootp_packet_type); 682 } 683 684 685 /* 686 * Send DHCP/BOOTP request to single interface. 687 */ 688 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 689 { 690 struct net_device *dev = d->dev; 691 struct sk_buff *skb; 692 struct bootp_pkt *b; 693 int hh_len = LL_RESERVED_SPACE(dev); 694 struct iphdr *h; 695 696 /* Allocate packet */ 697 skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL); 698 if (!skb) 699 return; 700 skb_reserve(skb, hh_len); 701 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 702 memset(b, 0, sizeof(struct bootp_pkt)); 703 704 /* Construct IP header */ 705 skb->nh.iph = h = &b->iph; 706 h->version = 4; 707 h->ihl = 5; 708 h->tot_len = htons(sizeof(struct bootp_pkt)); 709 h->frag_off = htons(IP_DF); 710 h->ttl = 64; 711 h->protocol = IPPROTO_UDP; 712 h->daddr = INADDR_BROADCAST; 713 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 714 715 /* Construct UDP header */ 716 b->udph.source = htons(68); 717 b->udph.dest = htons(67); 718 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 719 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 720 721 /* Construct DHCP/BOOTP header */ 722 b->op = BOOTP_REQUEST; 723 if (dev->type < 256) /* check for false types */ 724 b->htype = dev->type; 725 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ 726 b->htype = ARPHRD_IEEE802; 727 else if (dev->type == ARPHRD_FDDI) 728 b->htype = ARPHRD_ETHER; 729 else { 730 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 731 b->htype = dev->type; /* can cause undefined behavior */ 732 } 733 b->hlen = dev->addr_len; 734 b->your_ip = INADDR_NONE; 735 b->server_ip = INADDR_NONE; 736 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 737 b->secs = htons(jiffies_diff / HZ); 738 b->xid = d->xid; 739 740 /* add DHCP options or BOOTP extensions */ 741 #ifdef IPCONFIG_DHCP 742 if (ic_proto_enabled & IC_USE_DHCP) 743 ic_dhcp_init_options(b->exten); 744 else 745 #endif 746 ic_bootp_init_ext(b->exten); 747 748 /* Chain packet down the line... */ 749 skb->dev = dev; 750 skb->protocol = htons(ETH_P_IP); 751 if ((dev->hard_header && 752 dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) || 753 dev_queue_xmit(skb) < 0) 754 printk("E"); 755 } 756 757 758 /* 759 * Copy BOOTP-supplied string if not already set. 760 */ 761 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 762 { 763 if (!len) 764 return 0; 765 if (len > max-1) 766 len = max-1; 767 memcpy(dest, src, len); 768 dest[len] = '\0'; 769 return 1; 770 } 771 772 773 /* 774 * Process BOOTP extensions. 775 */ 776 static void __init ic_do_bootp_ext(u8 *ext) 777 { 778 u8 servers; 779 int i; 780 781 #ifdef IPCONFIG_DEBUG 782 u8 *c; 783 784 printk("DHCP/BOOTP: Got extension %d:",*ext); 785 for(c=ext+2; c<ext+2+ext[1]; c++) 786 printk(" %02x", *c); 787 printk("\n"); 788 #endif 789 790 switch (*ext++) { 791 case 1: /* Subnet mask */ 792 if (ic_netmask == INADDR_NONE) 793 memcpy(&ic_netmask, ext+1, 4); 794 break; 795 case 3: /* Default gateway */ 796 if (ic_gateway == INADDR_NONE) 797 memcpy(&ic_gateway, ext+1, 4); 798 break; 799 case 6: /* DNS server */ 800 servers= *ext/4; 801 if (servers > CONF_NAMESERVERS_MAX) 802 servers = CONF_NAMESERVERS_MAX; 803 for (i = 0; i < servers; i++) { 804 if (ic_nameservers[i] == INADDR_NONE) 805 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 806 } 807 break; 808 case 12: /* Host name */ 809 ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN); 810 ic_host_name_set = 1; 811 break; 812 case 15: /* Domain name (DNS) */ 813 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 814 break; 815 case 17: /* Root path */ 816 if (!root_server_path[0]) 817 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path)); 818 break; 819 case 40: /* NIS Domain name (_not_ DNS) */ 820 ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN); 821 break; 822 } 823 } 824 825 826 /* 827 * Receive BOOTP reply. 828 */ 829 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 830 { 831 struct bootp_pkt *b; 832 struct iphdr *h; 833 struct ic_device *d; 834 int len, ext_len; 835 836 /* Perform verifications before taking the lock. */ 837 if (skb->pkt_type == PACKET_OTHERHOST) 838 goto drop; 839 840 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 841 return NET_RX_DROP; 842 843 if (!pskb_may_pull(skb, 844 sizeof(struct iphdr) + 845 sizeof(struct udphdr))) 846 goto drop; 847 848 b = (struct bootp_pkt *) skb->nh.iph; 849 h = &b->iph; 850 851 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 852 goto drop; 853 854 /* Fragments are not supported */ 855 if (h->frag_off & htons(IP_OFFSET | IP_MF)) { 856 if (net_ratelimit()) 857 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " 858 "reply.\n"); 859 goto drop; 860 } 861 862 if (skb->len < ntohs(h->tot_len)) 863 goto drop; 864 865 if (ip_fast_csum((char *) h, h->ihl)) 866 goto drop; 867 868 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 869 goto drop; 870 871 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 872 goto drop; 873 874 len = ntohs(b->udph.len) - sizeof(struct udphdr); 875 ext_len = len - (sizeof(*b) - 876 sizeof(struct iphdr) - 877 sizeof(struct udphdr) - 878 sizeof(b->exten)); 879 if (ext_len < 0) 880 goto drop; 881 882 /* Ok the front looks good, make sure we can get at the rest. */ 883 if (!pskb_may_pull(skb, skb->len)) 884 goto drop; 885 886 b = (struct bootp_pkt *) skb->nh.iph; 887 h = &b->iph; 888 889 /* One reply at a time, please. */ 890 spin_lock(&ic_recv_lock); 891 892 /* If we already have a reply, just drop the packet */ 893 if (ic_got_reply) 894 goto drop_unlock; 895 896 /* Find the ic_device that the packet arrived on */ 897 d = ic_first_dev; 898 while (d && d->dev != dev) 899 d = d->next; 900 if (!d) 901 goto drop_unlock; /* should never happen */ 902 903 /* Is it a reply to our BOOTP request? */ 904 if (b->op != BOOTP_REPLY || 905 b->xid != d->xid) { 906 if (net_ratelimit()) 907 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " 908 "op[%x] xid[%x]\n", 909 b->op, b->xid); 910 goto drop_unlock; 911 } 912 913 /* Parse extensions */ 914 if (ext_len >= 4 && 915 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 916 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 917 u8 *ext; 918 919 #ifdef IPCONFIG_DHCP 920 if (ic_proto_enabled & IC_USE_DHCP) { 921 u32 server_id = INADDR_NONE; 922 int mt = 0; 923 924 ext = &b->exten[4]; 925 while (ext < end && *ext != 0xff) { 926 u8 *opt = ext++; 927 if (*opt == 0) /* Padding */ 928 continue; 929 ext += *ext + 1; 930 if (ext >= end) 931 break; 932 switch (*opt) { 933 case 53: /* Message type */ 934 if (opt[1]) 935 mt = opt[2]; 936 break; 937 case 54: /* Server ID (IP address) */ 938 if (opt[1] >= 4) 939 memcpy(&server_id, opt + 2, 4); 940 break; 941 }; 942 } 943 944 #ifdef IPCONFIG_DEBUG 945 printk("DHCP: Got message type %d\n", mt); 946 #endif 947 948 switch (mt) { 949 case DHCPOFFER: 950 /* While in the process of accepting one offer, 951 * ignore all others. 952 */ 953 if (ic_myaddr != INADDR_NONE) 954 goto drop_unlock; 955 956 /* Let's accept that offer. */ 957 ic_myaddr = b->your_ip; 958 ic_servaddr = server_id; 959 #ifdef IPCONFIG_DEBUG 960 printk("DHCP: Offered address %u.%u.%u.%u", 961 NIPQUAD(ic_myaddr)); 962 printk(" by server %u.%u.%u.%u\n", 963 NIPQUAD(ic_servaddr)); 964 #endif 965 /* The DHCP indicated server address takes 966 * precedence over the bootp header one if 967 * they are different. 968 */ 969 if ((server_id != INADDR_NONE) && 970 (b->server_ip != server_id)) 971 b->server_ip = ic_servaddr; 972 break; 973 974 case DHCPACK: 975 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 976 goto drop_unlock; 977 978 /* Yeah! */ 979 break; 980 981 default: 982 /* Urque. Forget it*/ 983 ic_myaddr = INADDR_NONE; 984 ic_servaddr = INADDR_NONE; 985 goto drop_unlock; 986 }; 987 988 ic_dhcp_msgtype = mt; 989 990 } 991 #endif /* IPCONFIG_DHCP */ 992 993 ext = &b->exten[4]; 994 while (ext < end && *ext != 0xff) { 995 u8 *opt = ext++; 996 if (*opt == 0) /* Padding */ 997 continue; 998 ext += *ext + 1; 999 if (ext < end) 1000 ic_do_bootp_ext(opt); 1001 } 1002 } 1003 1004 /* We have a winner! */ 1005 ic_dev = dev; 1006 ic_myaddr = b->your_ip; 1007 ic_servaddr = b->server_ip; 1008 if (ic_gateway == INADDR_NONE && b->relay_ip) 1009 ic_gateway = b->relay_ip; 1010 if (ic_nameservers[0] == INADDR_NONE) 1011 ic_nameservers[0] = ic_servaddr; 1012 ic_got_reply = IC_BOOTP; 1013 1014 drop_unlock: 1015 /* Show's over. Nothing to see here. */ 1016 spin_unlock(&ic_recv_lock); 1017 1018 drop: 1019 /* Throw the packet out. */ 1020 kfree_skb(skb); 1021 1022 return 0; 1023 } 1024 1025 1026 #endif 1027 1028 1029 /* 1030 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1031 */ 1032 1033 #ifdef IPCONFIG_DYNAMIC 1034 1035 static int __init ic_dynamic(void) 1036 { 1037 int retries; 1038 struct ic_device *d; 1039 unsigned long start_jiffies, timeout, jiff; 1040 int do_bootp = ic_proto_have_if & IC_BOOTP; 1041 int do_rarp = ic_proto_have_if & IC_RARP; 1042 1043 /* 1044 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1045 * This routine gets only called when some pieces of information 1046 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1047 */ 1048 if (!ic_proto_enabled) { 1049 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1050 return -1; 1051 } 1052 1053 #ifdef IPCONFIG_BOOTP 1054 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1055 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); 1056 #endif 1057 #ifdef IPCONFIG_RARP 1058 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1059 printk(KERN_ERR "RARP: No suitable device found.\n"); 1060 #endif 1061 1062 if (!ic_proto_have_if) 1063 /* Error message already printed */ 1064 return -1; 1065 1066 /* 1067 * Setup protocols 1068 */ 1069 #ifdef IPCONFIG_BOOTP 1070 if (do_bootp) 1071 ic_bootp_init(); 1072 #endif 1073 #ifdef IPCONFIG_RARP 1074 if (do_rarp) 1075 ic_rarp_init(); 1076 #endif 1077 1078 /* 1079 * Send requests and wait, until we get an answer. This loop 1080 * seems to be a terrible waste of CPU time, but actually there is 1081 * only one process running at all, so we don't need to use any 1082 * scheduler functions. 1083 * [Actually we could now, but the nothing else running note still 1084 * applies.. - AC] 1085 */ 1086 printk(KERN_NOTICE "Sending %s%s%s requests .", 1087 do_bootp 1088 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1089 (do_bootp && do_rarp) ? " and " : "", 1090 do_rarp ? "RARP" : ""); 1091 1092 start_jiffies = jiffies; 1093 d = ic_first_dev; 1094 retries = CONF_SEND_RETRIES; 1095 get_random_bytes(&timeout, sizeof(timeout)); 1096 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); 1097 for(;;) { 1098 #ifdef IPCONFIG_BOOTP 1099 if (do_bootp && (d->able & IC_BOOTP)) 1100 ic_bootp_send_if(d, jiffies - start_jiffies); 1101 #endif 1102 #ifdef IPCONFIG_RARP 1103 if (do_rarp && (d->able & IC_RARP)) 1104 ic_rarp_send_if(d); 1105 #endif 1106 1107 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1108 while (time_before(jiffies, jiff) && !ic_got_reply) 1109 schedule_timeout_uninterruptible(1); 1110 #ifdef IPCONFIG_DHCP 1111 /* DHCP isn't done until we get a DHCPACK. */ 1112 if ((ic_got_reply & IC_BOOTP) 1113 && (ic_proto_enabled & IC_USE_DHCP) 1114 && ic_dhcp_msgtype != DHCPACK) 1115 { 1116 ic_got_reply = 0; 1117 printk(","); 1118 continue; 1119 } 1120 #endif /* IPCONFIG_DHCP */ 1121 1122 if (ic_got_reply) { 1123 printk(" OK\n"); 1124 break; 1125 } 1126 1127 if ((d = d->next)) 1128 continue; 1129 1130 if (! --retries) { 1131 printk(" timed out!\n"); 1132 break; 1133 } 1134 1135 d = ic_first_dev; 1136 1137 timeout = timeout CONF_TIMEOUT_MULT; 1138 if (timeout > CONF_TIMEOUT_MAX) 1139 timeout = CONF_TIMEOUT_MAX; 1140 1141 printk("."); 1142 } 1143 1144 #ifdef IPCONFIG_BOOTP 1145 if (do_bootp) 1146 ic_bootp_cleanup(); 1147 #endif 1148 #ifdef IPCONFIG_RARP 1149 if (do_rarp) 1150 ic_rarp_cleanup(); 1151 #endif 1152 1153 if (!ic_got_reply) { 1154 ic_myaddr = INADDR_NONE; 1155 return -1; 1156 } 1157 1158 printk("IP-Config: Got %s answer from %u.%u.%u.%u, ", 1159 ((ic_got_reply & IC_RARP) ? "RARP" 1160 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1161 NIPQUAD(ic_servaddr)); 1162 printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr)); 1163 1164 return 0; 1165 } 1166 1167 #endif /* IPCONFIG_DYNAMIC */ 1168 1169 #ifdef CONFIG_PROC_FS 1170 1171 static int pnp_seq_show(struct seq_file *seq, void *v) 1172 { 1173 int i; 1174 1175 if (ic_proto_used & IC_PROTO) 1176 seq_printf(seq, "#PROTO: %s\n", 1177 (ic_proto_used & IC_RARP) ? "RARP" 1178 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1179 else 1180 seq_puts(seq, "#MANUAL\n"); 1181 1182 if (ic_domain[0]) 1183 seq_printf(seq, 1184 "domain %s\n", ic_domain); 1185 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1186 if (ic_nameservers[i] != INADDR_NONE) 1187 seq_printf(seq, 1188 "nameserver %u.%u.%u.%u\n", 1189 NIPQUAD(ic_nameservers[i])); 1190 } 1191 if (ic_servaddr != INADDR_NONE) 1192 seq_printf(seq, 1193 "bootserver %u.%u.%u.%u\n", 1194 NIPQUAD(ic_servaddr)); 1195 return 0; 1196 } 1197 1198 static int pnp_seq_open(struct inode *indoe, struct file *file) 1199 { 1200 return single_open(file, pnp_seq_show, NULL); 1201 } 1202 1203 static struct file_operations pnp_seq_fops = { 1204 .owner = THIS_MODULE, 1205 .open = pnp_seq_open, 1206 .read = seq_read, 1207 .llseek = seq_lseek, 1208 .release = single_release, 1209 }; 1210 #endif /* CONFIG_PROC_FS */ 1211 1212 /* 1213 * Extract IP address from the parameter string if needed. Note that we 1214 * need to have root_server_addr set _before_ IPConfig gets called as it 1215 * can override it. 1216 */ 1217 u32 __init root_nfs_parse_addr(char *name) 1218 { 1219 u32 addr; 1220 int octets = 0; 1221 char *cp, *cq; 1222 1223 cp = cq = name; 1224 while (octets < 4) { 1225 while (*cp >= '0' && *cp <= '9') 1226 cp++; 1227 if (cp == cq || cp - cq > 3) 1228 break; 1229 if (*cp == '.' || octets == 3) 1230 octets++; 1231 if (octets < 4) 1232 cp++; 1233 cq = cp; 1234 } 1235 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1236 if (*cp == ':') 1237 *cp++ = '\0'; 1238 addr = in_aton(name); 1239 memmove(name, cp, strlen(cp) + 1); 1240 } else 1241 addr = INADDR_NONE; 1242 1243 return addr; 1244 } 1245 1246 /* 1247 * IP Autoconfig dispatcher. 1248 */ 1249 1250 static int __init ip_auto_config(void) 1251 { 1252 u32 addr; 1253 1254 #ifdef CONFIG_PROC_FS 1255 proc_net_fops_create("pnp", S_IRUGO, &pnp_seq_fops); 1256 #endif /* CONFIG_PROC_FS */ 1257 1258 if (!ic_enable) 1259 return 0; 1260 1261 DBG(("IP-Config: Entered.\n")); 1262 #ifdef IPCONFIG_DYNAMIC 1263 try_try_again: 1264 #endif 1265 /* Give hardware a chance to settle */ 1266 msleep(CONF_PRE_OPEN); 1267 1268 /* Setup all network devices */ 1269 if (ic_open_devs() < 0) 1270 return -1; 1271 1272 /* Give drivers a chance to settle */ 1273 ssleep(CONF_POST_OPEN); 1274 1275 /* 1276 * If the config information is insufficient (e.g., our IP address or 1277 * IP address of the boot server is missing or we have multiple network 1278 * interfaces and no default was set), use BOOTP or RARP to get the 1279 * missing values. 1280 */ 1281 if (ic_myaddr == INADDR_NONE || 1282 #ifdef CONFIG_ROOT_NFS 1283 (MAJOR(ROOT_DEV) == UNNAMED_MAJOR 1284 && root_server_addr == INADDR_NONE 1285 && ic_servaddr == INADDR_NONE) || 1286 #endif 1287 ic_first_dev->next) { 1288 #ifdef IPCONFIG_DYNAMIC 1289 1290 int retries = CONF_OPEN_RETRIES; 1291 1292 if (ic_dynamic() < 0) { 1293 ic_close_devs(); 1294 1295 /* 1296 * I don't know why, but sometimes the 1297 * eepro100 driver (at least) gets upset and 1298 * doesn't work the first time it's opened. 1299 * But then if you close it and reopen it, it 1300 * works just fine. So we need to try that at 1301 * least once before giving up. 1302 * 1303 * Also, if the root will be NFS-mounted, we 1304 * have nowhere to go if DHCP fails. So we 1305 * just have to keep trying forever. 1306 * 1307 * -- Chip 1308 */ 1309 #ifdef CONFIG_ROOT_NFS 1310 if (ROOT_DEV == Root_NFS) { 1311 printk(KERN_ERR 1312 "IP-Config: Retrying forever (NFS root)...\n"); 1313 goto try_try_again; 1314 } 1315 #endif 1316 1317 if (--retries) { 1318 printk(KERN_ERR 1319 "IP-Config: Reopening network devices...\n"); 1320 goto try_try_again; 1321 } 1322 1323 /* Oh, well. At least we tried. */ 1324 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); 1325 return -1; 1326 } 1327 #else /* !DYNAMIC */ 1328 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1329 ic_close_devs(); 1330 return -1; 1331 #endif /* IPCONFIG_DYNAMIC */ 1332 } else { 1333 /* Device selected manually or only one device -> use it */ 1334 ic_dev = ic_first_dev->dev; 1335 } 1336 1337 addr = root_nfs_parse_addr(root_server_path); 1338 if (root_server_addr == INADDR_NONE) 1339 root_server_addr = addr; 1340 1341 /* 1342 * Use defaults whereever applicable. 1343 */ 1344 if (ic_defaults() < 0) 1345 return -1; 1346 1347 /* 1348 * Close all network devices except the device we've 1349 * autoconfigured and set up routes. 1350 */ 1351 ic_close_devs(); 1352 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1353 return -1; 1354 1355 /* 1356 * Record which protocol was actually used. 1357 */ 1358 #ifdef IPCONFIG_DYNAMIC 1359 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1360 #endif 1361 1362 #ifndef IPCONFIG_SILENT 1363 /* 1364 * Clue in the operator. 1365 */ 1366 printk("IP-Config: Complete:"); 1367 printk("\n device=%s", ic_dev->name); 1368 printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr)); 1369 printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask)); 1370 printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway)); 1371 printk(",\n host=%s, domain=%s, nis-domain=%s", 1372 system_utsname.nodename, ic_domain, system_utsname.domainname); 1373 printk(",\n bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr)); 1374 printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr)); 1375 printk(", rootpath=%s", root_server_path); 1376 printk("\n"); 1377 #endif /* !SILENT */ 1378 1379 return 0; 1380 } 1381 1382 late_initcall(ip_auto_config); 1383 1384 1385 /* 1386 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1387 * command line parameter. It consists of option fields separated by colons in 1388 * the following order: 1389 * 1390 * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO> 1391 * 1392 * Any of the fields can be empty which means to use a default value: 1393 * <client-ip> - address given by BOOTP or RARP 1394 * <server-ip> - address of host returning BOOTP or RARP packet 1395 * <gw-ip> - none, or the address returned by BOOTP 1396 * <netmask> - automatically determined from <client-ip>, or the 1397 * one returned by BOOTP 1398 * <host name> - <client-ip> in ASCII notation, or the name returned 1399 * by BOOTP 1400 * <device> - use all available devices 1401 * <PROTO>: 1402 * off|none - don't do autoconfig at all (DEFAULT) 1403 * on|any - use any configured protocol 1404 * dhcp|bootp|rarp - use only the specified protocol 1405 * both - use both BOOTP and RARP (not DHCP) 1406 */ 1407 static int __init ic_proto_name(char *name) 1408 { 1409 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1410 return 1; 1411 } 1412 #ifdef CONFIG_IP_PNP_DHCP 1413 else if (!strcmp(name, "dhcp")) { 1414 ic_proto_enabled &= ~IC_RARP; 1415 return 1; 1416 } 1417 #endif 1418 #ifdef CONFIG_IP_PNP_BOOTP 1419 else if (!strcmp(name, "bootp")) { 1420 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1421 return 1; 1422 } 1423 #endif 1424 #ifdef CONFIG_IP_PNP_RARP 1425 else if (!strcmp(name, "rarp")) { 1426 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1427 return 1; 1428 } 1429 #endif 1430 #ifdef IPCONFIG_DYNAMIC 1431 else if (!strcmp(name, "both")) { 1432 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1433 return 1; 1434 } 1435 #endif 1436 return 0; 1437 } 1438 1439 static int __init ip_auto_config_setup(char *addrs) 1440 { 1441 char *cp, *ip, *dp; 1442 int num = 0; 1443 1444 ic_set_manually = 1; 1445 1446 ic_enable = (*addrs && 1447 (strcmp(addrs, "off") != 0) && 1448 (strcmp(addrs, "none") != 0)); 1449 if (!ic_enable) 1450 return 1; 1451 1452 if (ic_proto_name(addrs)) 1453 return 1; 1454 1455 /* Parse the whole string */ 1456 ip = addrs; 1457 while (ip && *ip) { 1458 if ((cp = strchr(ip, ':'))) 1459 *cp++ = '\0'; 1460 if (strlen(ip) > 0) { 1461 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); 1462 switch (num) { 1463 case 0: 1464 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY) 1465 ic_myaddr = INADDR_NONE; 1466 break; 1467 case 1: 1468 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY) 1469 ic_servaddr = INADDR_NONE; 1470 break; 1471 case 2: 1472 if ((ic_gateway = in_aton(ip)) == INADDR_ANY) 1473 ic_gateway = INADDR_NONE; 1474 break; 1475 case 3: 1476 if ((ic_netmask = in_aton(ip)) == INADDR_ANY) 1477 ic_netmask = INADDR_NONE; 1478 break; 1479 case 4: 1480 if ((dp = strchr(ip, '.'))) { 1481 *dp++ = '\0'; 1482 strlcpy(system_utsname.domainname, dp, 1483 sizeof(system_utsname.domainname)); 1484 } 1485 strlcpy(system_utsname.nodename, ip, 1486 sizeof(system_utsname.nodename)); 1487 ic_host_name_set = 1; 1488 break; 1489 case 5: 1490 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1491 break; 1492 case 6: 1493 ic_proto_name(ip); 1494 break; 1495 } 1496 } 1497 ip = cp; 1498 num++; 1499 } 1500 1501 return 1; 1502 } 1503 1504 static int __init nfsaddrs_config_setup(char *addrs) 1505 { 1506 return ip_auto_config_setup(addrs); 1507 } 1508 1509 __setup("ip=", ip_auto_config_setup); 1510 __setup("nfsaddrs=", nfsaddrs_config_setup); 1511