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/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 <net/arp.h> 58 #include <net/ip.h> 59 #include <net/ipconfig.h> 60 61 #include <asm/uaccess.h> 62 #include <net/checksum.h> 63 #include <asm/processor.h> 64 65 /* Define this to allow debugging output */ 66 #undef IPCONFIG_DEBUG 67 68 #ifdef IPCONFIG_DEBUG 69 #define DBG(x) printk x 70 #else 71 #define DBG(x) do { } while(0) 72 #endif 73 74 #if defined(CONFIG_IP_PNP_DHCP) 75 #define IPCONFIG_DHCP 76 #endif 77 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) 78 #define IPCONFIG_BOOTP 79 #endif 80 #if defined(CONFIG_IP_PNP_RARP) 81 #define IPCONFIG_RARP 82 #endif 83 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) 84 #define IPCONFIG_DYNAMIC 85 #endif 86 87 /* Define the friendly delay before and after opening net devices */ 88 #define CONF_PRE_OPEN 500 /* Before opening: 1/2 second */ 89 #define CONF_POST_OPEN 1 /* After opening: 1 second */ 90 91 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ 92 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ 93 #define CONF_SEND_RETRIES 6 /* Send six requests per open */ 94 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */ 95 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ 96 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ 97 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ 98 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ 99 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers 100 - '3' from resolv.h */ 101 102 103 /* 104 * Public IP configuration 105 */ 106 107 /* This is used by platforms which might be able to set the ipconfig 108 * variables using firmware environment vars. If this is set, it will 109 * ignore such firmware variables. 110 */ 111 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ 112 113 static int ic_enable __initdata = 0; /* IP config enabled? */ 114 115 /* Protocol choice */ 116 int ic_proto_enabled __initdata = 0 117 #ifdef IPCONFIG_BOOTP 118 | IC_BOOTP 119 #endif 120 #ifdef CONFIG_IP_PNP_DHCP 121 | IC_USE_DHCP 122 #endif 123 #ifdef IPCONFIG_RARP 124 | IC_RARP 125 #endif 126 ; 127 128 static int ic_host_name_set __initdata = 0; /* Host name set by us? */ 129 130 u32 ic_myaddr = INADDR_NONE; /* My IP address */ 131 static u32 ic_netmask = INADDR_NONE; /* Netmask for local subnet */ 132 u32 ic_gateway = INADDR_NONE; /* Gateway IP address */ 133 134 u32 ic_servaddr = INADDR_NONE; /* Boot server IP address */ 135 136 u32 root_server_addr = INADDR_NONE; /* Address of NFS server */ 137 u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 138 139 /* Persistent data: */ 140 141 static int ic_proto_used; /* Protocol used, if any */ 142 static u32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 143 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 144 145 /* 146 * Private state. 147 */ 148 149 /* Name of user-selected boot device */ 150 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 151 152 /* Protocols supported by available interfaces */ 153 static int ic_proto_have_if __initdata = 0; 154 155 #ifdef IPCONFIG_DYNAMIC 156 static DEFINE_SPINLOCK(ic_recv_lock); 157 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */ 158 #endif 159 #ifdef IPCONFIG_DHCP 160 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */ 161 #endif 162 163 164 /* 165 * Network devices 166 */ 167 168 struct ic_device { 169 struct ic_device *next; 170 struct net_device *dev; 171 unsigned short flags; 172 short able; 173 u32 xid; 174 }; 175 176 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */ 177 static struct net_device *ic_dev __initdata = NULL; /* Selected device */ 178 179 static int __init ic_open_devs(void) 180 { 181 struct ic_device *d, **last; 182 struct net_device *dev; 183 unsigned short oflags; 184 185 last = &ic_first_dev; 186 rtnl_shlock(); 187 188 /* bring loopback device up first */ 189 if (dev_change_flags(&loopback_dev, loopback_dev.flags | IFF_UP) < 0) 190 printk(KERN_ERR "IP-Config: Failed to open %s\n", loopback_dev.name); 191 192 for (dev = dev_base; dev; dev = dev->next) { 193 if (dev == &loopback_dev) 194 continue; 195 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 196 (!(dev->flags & IFF_LOOPBACK) && 197 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 198 strncmp(dev->name, "dummy", 5))) { 199 int able = 0; 200 if (dev->mtu >= 364) 201 able |= IC_BOOTP; 202 else 203 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu); 204 if (!(dev->flags & IFF_NOARP)) 205 able |= IC_RARP; 206 able &= ic_proto_enabled; 207 if (ic_proto_enabled && !able) 208 continue; 209 oflags = dev->flags; 210 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 211 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); 212 continue; 213 } 214 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 215 rtnl_shunlock(); 216 return -1; 217 } 218 d->dev = dev; 219 *last = d; 220 last = &d->next; 221 d->flags = oflags; 222 d->able = able; 223 if (able & IC_BOOTP) 224 get_random_bytes(&d->xid, sizeof(u32)); 225 else 226 d->xid = 0; 227 ic_proto_have_if |= able; 228 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", 229 dev->name, able, d->xid)); 230 } 231 } 232 rtnl_shunlock(); 233 234 *last = NULL; 235 236 if (!ic_first_dev) { 237 if (user_dev_name[0]) 238 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name); 239 else 240 printk(KERN_ERR "IP-Config: No network devices available.\n"); 241 return -1; 242 } 243 return 0; 244 } 245 246 static void __init ic_close_devs(void) 247 { 248 struct ic_device *d, *next; 249 struct net_device *dev; 250 251 rtnl_shlock(); 252 next = ic_first_dev; 253 while ((d = next)) { 254 next = d->next; 255 dev = d->dev; 256 if (dev != ic_dev) { 257 DBG(("IP-Config: Downing %s\n", dev->name)); 258 dev_change_flags(dev, d->flags); 259 } 260 kfree(d); 261 } 262 rtnl_shunlock(); 263 } 264 265 /* 266 * Interface to various network functions. 267 */ 268 269 static inline void 270 set_sockaddr(struct sockaddr_in *sin, u32 addr, u16 port) 271 { 272 sin->sin_family = AF_INET; 273 sin->sin_addr.s_addr = addr; 274 sin->sin_port = port; 275 } 276 277 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 278 { 279 int res; 280 281 mm_segment_t oldfs = get_fs(); 282 set_fs(get_ds()); 283 res = devinet_ioctl(cmd, (struct ifreq __user *) arg); 284 set_fs(oldfs); 285 return res; 286 } 287 288 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 289 { 290 int res; 291 292 mm_segment_t oldfs = get_fs(); 293 set_fs(get_ds()); 294 res = ip_rt_ioctl(cmd, (void __user *) arg); 295 set_fs(oldfs); 296 return res; 297 } 298 299 /* 300 * Set up interface addresses and routes. 301 */ 302 303 static int __init ic_setup_if(void) 304 { 305 struct ifreq ir; 306 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 307 int err; 308 309 memset(&ir, 0, sizeof(ir)); 310 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); 311 set_sockaddr(sin, ic_myaddr, 0); 312 if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) { 313 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err); 314 return -1; 315 } 316 set_sockaddr(sin, ic_netmask, 0); 317 if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 318 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err); 319 return -1; 320 } 321 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 322 if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 323 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err); 324 return -1; 325 } 326 return 0; 327 } 328 329 static int __init ic_setup_routes(void) 330 { 331 /* No need to setup device routes, only the default route... */ 332 333 if (ic_gateway != INADDR_NONE) { 334 struct rtentry rm; 335 int err; 336 337 memset(&rm, 0, sizeof(rm)); 338 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 339 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n"); 340 return -1; 341 } 342 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 343 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 344 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 345 rm.rt_flags = RTF_UP | RTF_GATEWAY; 346 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 347 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err); 348 return -1; 349 } 350 } 351 352 return 0; 353 } 354 355 /* 356 * Fill in default values for all missing parameters. 357 */ 358 359 static int __init ic_defaults(void) 360 { 361 /* 362 * At this point we have no userspace running so need not 363 * claim locks on system_utsname 364 */ 365 366 if (!ic_host_name_set) 367 sprintf(system_utsname.nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr)); 368 369 if (root_server_addr == INADDR_NONE) 370 root_server_addr = ic_servaddr; 371 372 if (ic_netmask == INADDR_NONE) { 373 if (IN_CLASSA(ntohl(ic_myaddr))) 374 ic_netmask = htonl(IN_CLASSA_NET); 375 else if (IN_CLASSB(ntohl(ic_myaddr))) 376 ic_netmask = htonl(IN_CLASSB_NET); 377 else if (IN_CLASSC(ntohl(ic_myaddr))) 378 ic_netmask = htonl(IN_CLASSC_NET); 379 else { 380 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n", 381 NIPQUAD(ic_myaddr)); 382 return -1; 383 } 384 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask)); 385 } 386 387 return 0; 388 } 389 390 /* 391 * RARP support. 392 */ 393 394 #ifdef IPCONFIG_RARP 395 396 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt); 397 398 static struct packet_type rarp_packet_type __initdata = { 399 .type = __constant_htons(ETH_P_RARP), 400 .func = ic_rarp_recv, 401 }; 402 403 static inline void ic_rarp_init(void) 404 { 405 dev_add_pack(&rarp_packet_type); 406 } 407 408 static inline void ic_rarp_cleanup(void) 409 { 410 dev_remove_pack(&rarp_packet_type); 411 } 412 413 /* 414 * Process received RARP packet. 415 */ 416 static int __init 417 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt) 418 { 419 struct arphdr *rarp; 420 unsigned char *rarp_ptr; 421 unsigned long sip, tip; 422 unsigned char *sha, *tha; /* s for "source", t for "target" */ 423 struct ic_device *d; 424 425 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 426 return NET_RX_DROP; 427 428 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 429 goto drop; 430 431 /* Basic sanity checks can be done without the lock. */ 432 rarp = (struct arphdr *)skb->h.raw; 433 434 /* If this test doesn't pass, it's not IP, or we should 435 * ignore it anyway. 436 */ 437 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 438 goto drop; 439 440 /* If it's not a RARP reply, delete it. */ 441 if (rarp->ar_op != htons(ARPOP_RREPLY)) 442 goto drop; 443 444 /* If it's not Ethernet, delete it. */ 445 if (rarp->ar_pro != htons(ETH_P_IP)) 446 goto drop; 447 448 if (!pskb_may_pull(skb, 449 sizeof(struct arphdr) + 450 (2 * dev->addr_len) + 451 (2 * 4))) 452 goto drop; 453 454 /* OK, it is all there and looks valid, process... */ 455 rarp = (struct arphdr *)skb->h.raw; 456 rarp_ptr = (unsigned char *) (rarp + 1); 457 458 /* One reply at a time, please. */ 459 spin_lock(&ic_recv_lock); 460 461 /* If we already have a reply, just drop the packet */ 462 if (ic_got_reply) 463 goto drop_unlock; 464 465 /* Find the ic_device that the packet arrived on */ 466 d = ic_first_dev; 467 while (d && d->dev != dev) 468 d = d->next; 469 if (!d) 470 goto drop_unlock; /* should never happen */ 471 472 /* Extract variable-width fields */ 473 sha = rarp_ptr; 474 rarp_ptr += dev->addr_len; 475 memcpy(&sip, rarp_ptr, 4); 476 rarp_ptr += 4; 477 tha = rarp_ptr; 478 rarp_ptr += dev->addr_len; 479 memcpy(&tip, rarp_ptr, 4); 480 481 /* Discard packets which are not meant for us. */ 482 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 483 goto drop_unlock; 484 485 /* Discard packets which are not from specified server. */ 486 if (ic_servaddr != INADDR_NONE && ic_servaddr != sip) 487 goto drop_unlock; 488 489 /* We have a winner! */ 490 ic_dev = dev; 491 if (ic_myaddr == INADDR_NONE) 492 ic_myaddr = tip; 493 ic_servaddr = sip; 494 ic_got_reply = IC_RARP; 495 496 drop_unlock: 497 /* Show's over. Nothing to see here. */ 498 spin_unlock(&ic_recv_lock); 499 500 drop: 501 /* Throw the packet out. */ 502 kfree_skb(skb); 503 return 0; 504 } 505 506 507 /* 508 * Send RARP request packet over a single interface. 509 */ 510 static void __init ic_rarp_send_if(struct ic_device *d) 511 { 512 struct net_device *dev = d->dev; 513 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 514 dev->dev_addr, dev->dev_addr); 515 } 516 #endif 517 518 /* 519 * DHCP/BOOTP support. 520 */ 521 522 #ifdef IPCONFIG_BOOTP 523 524 struct bootp_pkt { /* BOOTP packet format */ 525 struct iphdr iph; /* IP header */ 526 struct udphdr udph; /* UDP header */ 527 u8 op; /* 1=request, 2=reply */ 528 u8 htype; /* HW address type */ 529 u8 hlen; /* HW address length */ 530 u8 hops; /* Used only by gateways */ 531 u32 xid; /* Transaction ID */ 532 u16 secs; /* Seconds since we started */ 533 u16 flags; /* Just what it says */ 534 u32 client_ip; /* Client's IP address if known */ 535 u32 your_ip; /* Assigned IP address */ 536 u32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 537 u32 relay_ip; /* IP address of BOOTP relay */ 538 u8 hw_addr[16]; /* Client's HW address */ 539 u8 serv_name[64]; /* Server host name */ 540 u8 boot_file[128]; /* Name of boot file */ 541 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 542 }; 543 544 /* packet ops */ 545 #define BOOTP_REQUEST 1 546 #define BOOTP_REPLY 2 547 548 /* DHCP message types */ 549 #define DHCPDISCOVER 1 550 #define DHCPOFFER 2 551 #define DHCPREQUEST 3 552 #define DHCPDECLINE 4 553 #define DHCPACK 5 554 #define DHCPNAK 6 555 #define DHCPRELEASE 7 556 #define DHCPINFORM 8 557 558 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt); 559 560 static struct packet_type bootp_packet_type __initdata = { 561 .type = __constant_htons(ETH_P_IP), 562 .func = ic_bootp_recv, 563 }; 564 565 566 /* 567 * Initialize DHCP/BOOTP extension fields in the request. 568 */ 569 570 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 571 572 #ifdef IPCONFIG_DHCP 573 574 static void __init 575 ic_dhcp_init_options(u8 *options) 576 { 577 u8 mt = ((ic_servaddr == INADDR_NONE) 578 ? DHCPDISCOVER : DHCPREQUEST); 579 u8 *e = options; 580 581 #ifdef IPCONFIG_DEBUG 582 printk("DHCP: Sending message type %d\n", mt); 583 #endif 584 585 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 586 e += 4; 587 588 *e++ = 53; /* DHCP message type */ 589 *e++ = 1; 590 *e++ = mt; 591 592 if (mt == DHCPREQUEST) { 593 *e++ = 54; /* Server ID (IP address) */ 594 *e++ = 4; 595 memcpy(e, &ic_servaddr, 4); 596 e += 4; 597 598 *e++ = 50; /* Requested IP address */ 599 *e++ = 4; 600 memcpy(e, &ic_myaddr, 4); 601 e += 4; 602 } 603 604 /* always? */ 605 { 606 static const u8 ic_req_params[] = { 607 1, /* Subnet mask */ 608 3, /* Default gateway */ 609 6, /* DNS server */ 610 12, /* Host name */ 611 15, /* Domain name */ 612 17, /* Boot path */ 613 40, /* NIS domain name */ 614 }; 615 616 *e++ = 55; /* Parameter request list */ 617 *e++ = sizeof(ic_req_params); 618 memcpy(e, ic_req_params, sizeof(ic_req_params)); 619 e += sizeof(ic_req_params); 620 } 621 622 *e++ = 255; /* End of the list */ 623 } 624 625 #endif /* IPCONFIG_DHCP */ 626 627 static void __init ic_bootp_init_ext(u8 *e) 628 { 629 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 630 e += 4; 631 *e++ = 1; /* Subnet mask request */ 632 *e++ = 4; 633 e += 4; 634 *e++ = 3; /* Default gateway request */ 635 *e++ = 4; 636 e += 4; 637 *e++ = 5; /* Name server request */ 638 *e++ = 8; 639 e += 8; 640 *e++ = 12; /* Host name request */ 641 *e++ = 32; 642 e += 32; 643 *e++ = 40; /* NIS Domain name request */ 644 *e++ = 32; 645 e += 32; 646 *e++ = 17; /* Boot path */ 647 *e++ = 40; 648 e += 40; 649 650 *e++ = 57; /* set extension buffer size for reply */ 651 *e++ = 2; 652 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 653 *e++ = 150; 654 655 *e++ = 255; /* End of the list */ 656 } 657 658 659 /* 660 * Initialize the DHCP/BOOTP mechanism. 661 */ 662 static inline void ic_bootp_init(void) 663 { 664 int i; 665 666 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 667 ic_nameservers[i] = INADDR_NONE; 668 669 dev_add_pack(&bootp_packet_type); 670 } 671 672 673 /* 674 * DHCP/BOOTP cleanup. 675 */ 676 static inline void ic_bootp_cleanup(void) 677 { 678 dev_remove_pack(&bootp_packet_type); 679 } 680 681 682 /* 683 * Send DHCP/BOOTP request to single interface. 684 */ 685 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 686 { 687 struct net_device *dev = d->dev; 688 struct sk_buff *skb; 689 struct bootp_pkt *b; 690 int hh_len = LL_RESERVED_SPACE(dev); 691 struct iphdr *h; 692 693 /* Allocate packet */ 694 skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL); 695 if (!skb) 696 return; 697 skb_reserve(skb, hh_len); 698 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 699 memset(b, 0, sizeof(struct bootp_pkt)); 700 701 /* Construct IP header */ 702 skb->nh.iph = h = &b->iph; 703 h->version = 4; 704 h->ihl = 5; 705 h->tot_len = htons(sizeof(struct bootp_pkt)); 706 h->frag_off = htons(IP_DF); 707 h->ttl = 64; 708 h->protocol = IPPROTO_UDP; 709 h->daddr = INADDR_BROADCAST; 710 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 711 712 /* Construct UDP header */ 713 b->udph.source = htons(68); 714 b->udph.dest = htons(67); 715 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 716 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 717 718 /* Construct DHCP/BOOTP header */ 719 b->op = BOOTP_REQUEST; 720 if (dev->type < 256) /* check for false types */ 721 b->htype = dev->type; 722 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ 723 b->htype = ARPHRD_IEEE802; 724 else if (dev->type == ARPHRD_FDDI) 725 b->htype = ARPHRD_ETHER; 726 else { 727 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 728 b->htype = dev->type; /* can cause undefined behavior */ 729 } 730 b->hlen = dev->addr_len; 731 b->your_ip = INADDR_NONE; 732 b->server_ip = INADDR_NONE; 733 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 734 b->secs = htons(jiffies_diff / HZ); 735 b->xid = d->xid; 736 737 /* add DHCP options or BOOTP extensions */ 738 #ifdef IPCONFIG_DHCP 739 if (ic_proto_enabled & IC_USE_DHCP) 740 ic_dhcp_init_options(b->exten); 741 else 742 #endif 743 ic_bootp_init_ext(b->exten); 744 745 /* Chain packet down the line... */ 746 skb->dev = dev; 747 skb->protocol = htons(ETH_P_IP); 748 if ((dev->hard_header && 749 dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) || 750 dev_queue_xmit(skb) < 0) 751 printk("E"); 752 } 753 754 755 /* 756 * Copy BOOTP-supplied string if not already set. 757 */ 758 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 759 { 760 if (!len) 761 return 0; 762 if (len > max-1) 763 len = max-1; 764 memcpy(dest, src, len); 765 dest[len] = '\0'; 766 return 1; 767 } 768 769 770 /* 771 * Process BOOTP extensions. 772 */ 773 static void __init ic_do_bootp_ext(u8 *ext) 774 { 775 u8 servers; 776 int i; 777 778 #ifdef IPCONFIG_DEBUG 779 u8 *c; 780 781 printk("DHCP/BOOTP: Got extension %d:",*ext); 782 for(c=ext+2; c<ext+2+ext[1]; c++) 783 printk(" %02x", *c); 784 printk("\n"); 785 #endif 786 787 switch (*ext++) { 788 case 1: /* Subnet mask */ 789 if (ic_netmask == INADDR_NONE) 790 memcpy(&ic_netmask, ext+1, 4); 791 break; 792 case 3: /* Default gateway */ 793 if (ic_gateway == INADDR_NONE) 794 memcpy(&ic_gateway, ext+1, 4); 795 break; 796 case 6: /* DNS server */ 797 servers= *ext/4; 798 if (servers > CONF_NAMESERVERS_MAX) 799 servers = CONF_NAMESERVERS_MAX; 800 for (i = 0; i < servers; i++) { 801 if (ic_nameservers[i] == INADDR_NONE) 802 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 803 } 804 break; 805 case 12: /* Host name */ 806 ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN); 807 ic_host_name_set = 1; 808 break; 809 case 15: /* Domain name (DNS) */ 810 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 811 break; 812 case 17: /* Root path */ 813 if (!root_server_path[0]) 814 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path)); 815 break; 816 case 40: /* NIS Domain name (_not_ DNS) */ 817 ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN); 818 break; 819 } 820 } 821 822 823 /* 824 * Receive BOOTP reply. 825 */ 826 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt) 827 { 828 struct bootp_pkt *b; 829 struct iphdr *h; 830 struct ic_device *d; 831 int len, ext_len; 832 833 /* Perform verifications before taking the lock. */ 834 if (skb->pkt_type == PACKET_OTHERHOST) 835 goto drop; 836 837 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 838 return NET_RX_DROP; 839 840 if (!pskb_may_pull(skb, 841 sizeof(struct iphdr) + 842 sizeof(struct udphdr))) 843 goto drop; 844 845 b = (struct bootp_pkt *) skb->nh.iph; 846 h = &b->iph; 847 848 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 849 goto drop; 850 851 /* Fragments are not supported */ 852 if (h->frag_off & htons(IP_OFFSET | IP_MF)) { 853 if (net_ratelimit()) 854 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " 855 "reply.\n"); 856 goto drop; 857 } 858 859 if (skb->len < ntohs(h->tot_len)) 860 goto drop; 861 862 if (ip_fast_csum((char *) h, h->ihl)) 863 goto drop; 864 865 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 866 goto drop; 867 868 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 869 goto drop; 870 871 len = ntohs(b->udph.len) - sizeof(struct udphdr); 872 ext_len = len - (sizeof(*b) - 873 sizeof(struct iphdr) - 874 sizeof(struct udphdr) - 875 sizeof(b->exten)); 876 if (ext_len < 0) 877 goto drop; 878 879 /* Ok the front looks good, make sure we can get at the rest. */ 880 if (!pskb_may_pull(skb, skb->len)) 881 goto drop; 882 883 b = (struct bootp_pkt *) skb->nh.iph; 884 h = &b->iph; 885 886 /* One reply at a time, please. */ 887 spin_lock(&ic_recv_lock); 888 889 /* If we already have a reply, just drop the packet */ 890 if (ic_got_reply) 891 goto drop_unlock; 892 893 /* Find the ic_device that the packet arrived on */ 894 d = ic_first_dev; 895 while (d && d->dev != dev) 896 d = d->next; 897 if (!d) 898 goto drop_unlock; /* should never happen */ 899 900 /* Is it a reply to our BOOTP request? */ 901 if (b->op != BOOTP_REPLY || 902 b->xid != d->xid) { 903 if (net_ratelimit()) 904 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " 905 "op[%x] xid[%x]\n", 906 b->op, b->xid); 907 goto drop_unlock; 908 } 909 910 /* Parse extensions */ 911 if (ext_len >= 4 && 912 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 913 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 914 u8 *ext; 915 916 #ifdef IPCONFIG_DHCP 917 if (ic_proto_enabled & IC_USE_DHCP) { 918 u32 server_id = INADDR_NONE; 919 int mt = 0; 920 921 ext = &b->exten[4]; 922 while (ext < end && *ext != 0xff) { 923 u8 *opt = ext++; 924 if (*opt == 0) /* Padding */ 925 continue; 926 ext += *ext + 1; 927 if (ext >= end) 928 break; 929 switch (*opt) { 930 case 53: /* Message type */ 931 if (opt[1]) 932 mt = opt[2]; 933 break; 934 case 54: /* Server ID (IP address) */ 935 if (opt[1] >= 4) 936 memcpy(&server_id, opt + 2, 4); 937 break; 938 }; 939 } 940 941 #ifdef IPCONFIG_DEBUG 942 printk("DHCP: Got message type %d\n", mt); 943 #endif 944 945 switch (mt) { 946 case DHCPOFFER: 947 /* While in the process of accepting one offer, 948 * ignore all others. 949 */ 950 if (ic_myaddr != INADDR_NONE) 951 goto drop_unlock; 952 953 /* Let's accept that offer. */ 954 ic_myaddr = b->your_ip; 955 ic_servaddr = server_id; 956 #ifdef IPCONFIG_DEBUG 957 printk("DHCP: Offered address %u.%u.%u.%u", 958 NIPQUAD(ic_myaddr)); 959 printk(" by server %u.%u.%u.%u\n", 960 NIPQUAD(ic_servaddr)); 961 #endif 962 /* The DHCP indicated server address takes 963 * precedence over the bootp header one if 964 * they are different. 965 */ 966 if ((server_id != INADDR_NONE) && 967 (b->server_ip != server_id)) 968 b->server_ip = ic_servaddr; 969 break; 970 971 case DHCPACK: 972 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 973 goto drop_unlock; 974 975 /* Yeah! */ 976 break; 977 978 default: 979 /* Urque. Forget it*/ 980 ic_myaddr = INADDR_NONE; 981 ic_servaddr = INADDR_NONE; 982 goto drop_unlock; 983 }; 984 985 ic_dhcp_msgtype = mt; 986 987 } 988 #endif /* IPCONFIG_DHCP */ 989 990 ext = &b->exten[4]; 991 while (ext < end && *ext != 0xff) { 992 u8 *opt = ext++; 993 if (*opt == 0) /* Padding */ 994 continue; 995 ext += *ext + 1; 996 if (ext < end) 997 ic_do_bootp_ext(opt); 998 } 999 } 1000 1001 /* We have a winner! */ 1002 ic_dev = dev; 1003 ic_myaddr = b->your_ip; 1004 ic_servaddr = b->server_ip; 1005 if (ic_gateway == INADDR_NONE && b->relay_ip) 1006 ic_gateway = b->relay_ip; 1007 if (ic_nameservers[0] == INADDR_NONE) 1008 ic_nameservers[0] = ic_servaddr; 1009 ic_got_reply = IC_BOOTP; 1010 1011 drop_unlock: 1012 /* Show's over. Nothing to see here. */ 1013 spin_unlock(&ic_recv_lock); 1014 1015 drop: 1016 /* Throw the packet out. */ 1017 kfree_skb(skb); 1018 1019 return 0; 1020 } 1021 1022 1023 #endif 1024 1025 1026 /* 1027 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1028 */ 1029 1030 #ifdef IPCONFIG_DYNAMIC 1031 1032 static int __init ic_dynamic(void) 1033 { 1034 int retries; 1035 struct ic_device *d; 1036 unsigned long start_jiffies, timeout, jiff; 1037 int do_bootp = ic_proto_have_if & IC_BOOTP; 1038 int do_rarp = ic_proto_have_if & IC_RARP; 1039 1040 /* 1041 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1042 * This routine gets only called when some pieces of information 1043 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1044 */ 1045 if (!ic_proto_enabled) { 1046 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1047 return -1; 1048 } 1049 1050 #ifdef IPCONFIG_BOOTP 1051 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1052 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); 1053 #endif 1054 #ifdef IPCONFIG_RARP 1055 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1056 printk(KERN_ERR "RARP: No suitable device found.\n"); 1057 #endif 1058 1059 if (!ic_proto_have_if) 1060 /* Error message already printed */ 1061 return -1; 1062 1063 /* 1064 * Setup protocols 1065 */ 1066 #ifdef IPCONFIG_BOOTP 1067 if (do_bootp) 1068 ic_bootp_init(); 1069 #endif 1070 #ifdef IPCONFIG_RARP 1071 if (do_rarp) 1072 ic_rarp_init(); 1073 #endif 1074 1075 /* 1076 * Send requests and wait, until we get an answer. This loop 1077 * seems to be a terrible waste of CPU time, but actually there is 1078 * only one process running at all, so we don't need to use any 1079 * scheduler functions. 1080 * [Actually we could now, but the nothing else running note still 1081 * applies.. - AC] 1082 */ 1083 printk(KERN_NOTICE "Sending %s%s%s requests .", 1084 do_bootp 1085 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1086 (do_bootp && do_rarp) ? " and " : "", 1087 do_rarp ? "RARP" : ""); 1088 1089 start_jiffies = jiffies; 1090 d = ic_first_dev; 1091 retries = CONF_SEND_RETRIES; 1092 get_random_bytes(&timeout, sizeof(timeout)); 1093 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); 1094 for(;;) { 1095 #ifdef IPCONFIG_BOOTP 1096 if (do_bootp && (d->able & IC_BOOTP)) 1097 ic_bootp_send_if(d, jiffies - start_jiffies); 1098 #endif 1099 #ifdef IPCONFIG_RARP 1100 if (do_rarp && (d->able & IC_RARP)) 1101 ic_rarp_send_if(d); 1102 #endif 1103 1104 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1105 while (time_before(jiffies, jiff) && !ic_got_reply) { 1106 set_current_state(TASK_UNINTERRUPTIBLE); 1107 schedule_timeout(1); 1108 } 1109 #ifdef IPCONFIG_DHCP 1110 /* DHCP isn't done until we get a DHCPACK. */ 1111 if ((ic_got_reply & IC_BOOTP) 1112 && (ic_proto_enabled & IC_USE_DHCP) 1113 && ic_dhcp_msgtype != DHCPACK) 1114 { 1115 ic_got_reply = 0; 1116 printk(","); 1117 continue; 1118 } 1119 #endif /* IPCONFIG_DHCP */ 1120 1121 if (ic_got_reply) { 1122 printk(" OK\n"); 1123 break; 1124 } 1125 1126 if ((d = d->next)) 1127 continue; 1128 1129 if (! --retries) { 1130 printk(" timed out!\n"); 1131 break; 1132 } 1133 1134 d = ic_first_dev; 1135 1136 timeout = timeout CONF_TIMEOUT_MULT; 1137 if (timeout > CONF_TIMEOUT_MAX) 1138 timeout = CONF_TIMEOUT_MAX; 1139 1140 printk("."); 1141 } 1142 1143 #ifdef IPCONFIG_BOOTP 1144 if (do_bootp) 1145 ic_bootp_cleanup(); 1146 #endif 1147 #ifdef IPCONFIG_RARP 1148 if (do_rarp) 1149 ic_rarp_cleanup(); 1150 #endif 1151 1152 if (!ic_got_reply) 1153 return -1; 1154 1155 printk("IP-Config: Got %s answer from %u.%u.%u.%u, ", 1156 ((ic_got_reply & IC_RARP) ? "RARP" 1157 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1158 NIPQUAD(ic_servaddr)); 1159 printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr)); 1160 1161 return 0; 1162 } 1163 1164 #endif /* IPCONFIG_DYNAMIC */ 1165 1166 #ifdef CONFIG_PROC_FS 1167 1168 static int pnp_seq_show(struct seq_file *seq, void *v) 1169 { 1170 int i; 1171 1172 if (ic_proto_used & IC_PROTO) 1173 seq_printf(seq, "#PROTO: %s\n", 1174 (ic_proto_used & IC_RARP) ? "RARP" 1175 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1176 else 1177 seq_puts(seq, "#MANUAL\n"); 1178 1179 if (ic_domain[0]) 1180 seq_printf(seq, 1181 "domain %s\n", ic_domain); 1182 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1183 if (ic_nameservers[i] != INADDR_NONE) 1184 seq_printf(seq, 1185 "nameserver %u.%u.%u.%u\n", 1186 NIPQUAD(ic_nameservers[i])); 1187 } 1188 if (ic_servaddr != INADDR_NONE) 1189 seq_printf(seq, 1190 "bootserver %u.%u.%u.%u\n", 1191 NIPQUAD(ic_servaddr)); 1192 return 0; 1193 } 1194 1195 static int pnp_seq_open(struct inode *indoe, struct file *file) 1196 { 1197 return single_open(file, pnp_seq_show, NULL); 1198 } 1199 1200 static struct file_operations pnp_seq_fops = { 1201 .owner = THIS_MODULE, 1202 .open = pnp_seq_open, 1203 .read = seq_read, 1204 .llseek = seq_lseek, 1205 .release = single_release, 1206 }; 1207 #endif /* CONFIG_PROC_FS */ 1208 1209 /* 1210 * Extract IP address from the parameter string if needed. Note that we 1211 * need to have root_server_addr set _before_ IPConfig gets called as it 1212 * can override it. 1213 */ 1214 u32 __init root_nfs_parse_addr(char *name) 1215 { 1216 u32 addr; 1217 int octets = 0; 1218 char *cp, *cq; 1219 1220 cp = cq = name; 1221 while (octets < 4) { 1222 while (*cp >= '0' && *cp <= '9') 1223 cp++; 1224 if (cp == cq || cp - cq > 3) 1225 break; 1226 if (*cp == '.' || octets == 3) 1227 octets++; 1228 if (octets < 4) 1229 cp++; 1230 cq = cp; 1231 } 1232 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1233 if (*cp == ':') 1234 *cp++ = '\0'; 1235 addr = in_aton(name); 1236 memmove(name, cp, strlen(cp) + 1); 1237 } else 1238 addr = INADDR_NONE; 1239 1240 return addr; 1241 } 1242 1243 /* 1244 * IP Autoconfig dispatcher. 1245 */ 1246 1247 static int __init ip_auto_config(void) 1248 { 1249 u32 addr; 1250 1251 #ifdef CONFIG_PROC_FS 1252 proc_net_fops_create("pnp", S_IRUGO, &pnp_seq_fops); 1253 #endif /* CONFIG_PROC_FS */ 1254 1255 if (!ic_enable) 1256 return 0; 1257 1258 DBG(("IP-Config: Entered.\n")); 1259 #ifdef IPCONFIG_DYNAMIC 1260 try_try_again: 1261 #endif 1262 /* Give hardware a chance to settle */ 1263 msleep(CONF_PRE_OPEN); 1264 1265 /* Setup all network devices */ 1266 if (ic_open_devs() < 0) 1267 return -1; 1268 1269 /* Give drivers a chance to settle */ 1270 ssleep(CONF_POST_OPEN); 1271 1272 /* 1273 * If the config information is insufficient (e.g., our IP address or 1274 * IP address of the boot server is missing or we have multiple network 1275 * interfaces and no default was set), use BOOTP or RARP to get the 1276 * missing values. 1277 */ 1278 if (ic_myaddr == INADDR_NONE || 1279 #ifdef CONFIG_ROOT_NFS 1280 (MAJOR(ROOT_DEV) == UNNAMED_MAJOR 1281 && root_server_addr == INADDR_NONE 1282 && ic_servaddr == INADDR_NONE) || 1283 #endif 1284 ic_first_dev->next) { 1285 #ifdef IPCONFIG_DYNAMIC 1286 1287 int retries = CONF_OPEN_RETRIES; 1288 1289 if (ic_dynamic() < 0) { 1290 ic_close_devs(); 1291 1292 /* 1293 * I don't know why, but sometimes the 1294 * eepro100 driver (at least) gets upset and 1295 * doesn't work the first time it's opened. 1296 * But then if you close it and reopen it, it 1297 * works just fine. So we need to try that at 1298 * least once before giving up. 1299 * 1300 * Also, if the root will be NFS-mounted, we 1301 * have nowhere to go if DHCP fails. So we 1302 * just have to keep trying forever. 1303 * 1304 * -- Chip 1305 */ 1306 #ifdef CONFIG_ROOT_NFS 1307 if (ROOT_DEV == Root_NFS) { 1308 printk(KERN_ERR 1309 "IP-Config: Retrying forever (NFS root)...\n"); 1310 goto try_try_again; 1311 } 1312 #endif 1313 1314 if (--retries) { 1315 printk(KERN_ERR 1316 "IP-Config: Reopening network devices...\n"); 1317 goto try_try_again; 1318 } 1319 1320 /* Oh, well. At least we tried. */ 1321 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); 1322 return -1; 1323 } 1324 #else /* !DYNAMIC */ 1325 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1326 ic_close_devs(); 1327 return -1; 1328 #endif /* IPCONFIG_DYNAMIC */ 1329 } else { 1330 /* Device selected manually or only one device -> use it */ 1331 ic_dev = ic_first_dev->dev; 1332 } 1333 1334 addr = root_nfs_parse_addr(root_server_path); 1335 if (root_server_addr == INADDR_NONE) 1336 root_server_addr = addr; 1337 1338 /* 1339 * Use defaults whereever applicable. 1340 */ 1341 if (ic_defaults() < 0) 1342 return -1; 1343 1344 /* 1345 * Close all network devices except the device we've 1346 * autoconfigured and set up routes. 1347 */ 1348 ic_close_devs(); 1349 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1350 return -1; 1351 1352 /* 1353 * Record which protocol was actually used. 1354 */ 1355 #ifdef IPCONFIG_DYNAMIC 1356 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1357 #endif 1358 1359 #ifndef IPCONFIG_SILENT 1360 /* 1361 * Clue in the operator. 1362 */ 1363 printk("IP-Config: Complete:"); 1364 printk("\n device=%s", ic_dev->name); 1365 printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr)); 1366 printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask)); 1367 printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway)); 1368 printk(",\n host=%s, domain=%s, nis-domain=%s", 1369 system_utsname.nodename, ic_domain, system_utsname.domainname); 1370 printk(",\n bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr)); 1371 printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr)); 1372 printk(", rootpath=%s", root_server_path); 1373 printk("\n"); 1374 #endif /* !SILENT */ 1375 1376 return 0; 1377 } 1378 1379 late_initcall(ip_auto_config); 1380 1381 1382 /* 1383 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1384 * command line parameter. It consists of option fields separated by colons in 1385 * the following order: 1386 * 1387 * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO> 1388 * 1389 * Any of the fields can be empty which means to use a default value: 1390 * <client-ip> - address given by BOOTP or RARP 1391 * <server-ip> - address of host returning BOOTP or RARP packet 1392 * <gw-ip> - none, or the address returned by BOOTP 1393 * <netmask> - automatically determined from <client-ip>, or the 1394 * one returned by BOOTP 1395 * <host name> - <client-ip> in ASCII notation, or the name returned 1396 * by BOOTP 1397 * <device> - use all available devices 1398 * <PROTO>: 1399 * off|none - don't do autoconfig at all (DEFAULT) 1400 * on|any - use any configured protocol 1401 * dhcp|bootp|rarp - use only the specified protocol 1402 * both - use both BOOTP and RARP (not DHCP) 1403 */ 1404 static int __init ic_proto_name(char *name) 1405 { 1406 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1407 return 1; 1408 } 1409 #ifdef CONFIG_IP_PNP_DHCP 1410 else if (!strcmp(name, "dhcp")) { 1411 ic_proto_enabled &= ~IC_RARP; 1412 return 1; 1413 } 1414 #endif 1415 #ifdef CONFIG_IP_PNP_BOOTP 1416 else if (!strcmp(name, "bootp")) { 1417 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1418 return 1; 1419 } 1420 #endif 1421 #ifdef CONFIG_IP_PNP_RARP 1422 else if (!strcmp(name, "rarp")) { 1423 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1424 return 1; 1425 } 1426 #endif 1427 #ifdef IPCONFIG_DYNAMIC 1428 else if (!strcmp(name, "both")) { 1429 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1430 return 1; 1431 } 1432 #endif 1433 return 0; 1434 } 1435 1436 static int __init ip_auto_config_setup(char *addrs) 1437 { 1438 char *cp, *ip, *dp; 1439 int num = 0; 1440 1441 ic_set_manually = 1; 1442 1443 ic_enable = (*addrs && 1444 (strcmp(addrs, "off") != 0) && 1445 (strcmp(addrs, "none") != 0)); 1446 if (!ic_enable) 1447 return 1; 1448 1449 if (ic_proto_name(addrs)) 1450 return 1; 1451 1452 /* Parse the whole string */ 1453 ip = addrs; 1454 while (ip && *ip) { 1455 if ((cp = strchr(ip, ':'))) 1456 *cp++ = '\0'; 1457 if (strlen(ip) > 0) { 1458 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); 1459 switch (num) { 1460 case 0: 1461 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY) 1462 ic_myaddr = INADDR_NONE; 1463 break; 1464 case 1: 1465 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY) 1466 ic_servaddr = INADDR_NONE; 1467 break; 1468 case 2: 1469 if ((ic_gateway = in_aton(ip)) == INADDR_ANY) 1470 ic_gateway = INADDR_NONE; 1471 break; 1472 case 3: 1473 if ((ic_netmask = in_aton(ip)) == INADDR_ANY) 1474 ic_netmask = INADDR_NONE; 1475 break; 1476 case 4: 1477 if ((dp = strchr(ip, '.'))) { 1478 *dp++ = '\0'; 1479 strlcpy(system_utsname.domainname, dp, 1480 sizeof(system_utsname.domainname)); 1481 } 1482 strlcpy(system_utsname.nodename, ip, 1483 sizeof(system_utsname.nodename)); 1484 ic_host_name_set = 1; 1485 break; 1486 case 5: 1487 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1488 break; 1489 case 6: 1490 ic_proto_name(ip); 1491 break; 1492 } 1493 } 1494 ip = cp; 1495 num++; 1496 } 1497 1498 return 1; 1499 } 1500 1501 static int __init nfsaddrs_config_setup(char *addrs) 1502 { 1503 return ip_auto_config_setup(addrs); 1504 } 1505 1506 __setup("ip=", ip_auto_config_setup); 1507 __setup("nfsaddrs=", nfsaddrs_config_setup); 1508