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/arp.h> 59 #include <net/ip.h> 60 #include <net/ipconfig.h> 61 #include <net/route.h> 62 63 #include <asm/uaccess.h> 64 #include <net/checksum.h> 65 #include <asm/processor.h> 66 67 /* Define this to allow debugging output */ 68 #undef IPCONFIG_DEBUG 69 70 #ifdef IPCONFIG_DEBUG 71 #define DBG(x) printk x 72 #else 73 #define DBG(x) do { } while(0) 74 #endif 75 76 #if defined(CONFIG_IP_PNP_DHCP) 77 #define IPCONFIG_DHCP 78 #endif 79 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) 80 #define IPCONFIG_BOOTP 81 #endif 82 #if defined(CONFIG_IP_PNP_RARP) 83 #define IPCONFIG_RARP 84 #endif 85 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) 86 #define IPCONFIG_DYNAMIC 87 #endif 88 89 /* Define the friendly delay before and after opening net devices */ 90 #define CONF_PRE_OPEN 500 /* Before opening: 1/2 second */ 91 #define CONF_POST_OPEN 1 /* After opening: 1 second */ 92 93 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ 94 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ 95 #define CONF_SEND_RETRIES 6 /* Send six requests per open */ 96 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */ 97 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ 98 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ 99 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ 100 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ 101 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers 102 - '3' from resolv.h */ 103 104 105 /* 106 * Public IP configuration 107 */ 108 109 /* This is used by platforms which might be able to set the ipconfig 110 * variables using firmware environment vars. If this is set, it will 111 * ignore such firmware variables. 112 */ 113 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ 114 115 static int ic_enable __initdata = 0; /* IP config enabled? */ 116 117 /* Protocol choice */ 118 int ic_proto_enabled __initdata = 0 119 #ifdef IPCONFIG_BOOTP 120 | IC_BOOTP 121 #endif 122 #ifdef CONFIG_IP_PNP_DHCP 123 | IC_USE_DHCP 124 #endif 125 #ifdef IPCONFIG_RARP 126 | IC_RARP 127 #endif 128 ; 129 130 static int ic_host_name_set __initdata = 0; /* Host name set by us? */ 131 132 u32 ic_myaddr = INADDR_NONE; /* My IP address */ 133 static u32 ic_netmask = INADDR_NONE; /* Netmask for local subnet */ 134 u32 ic_gateway = INADDR_NONE; /* Gateway IP address */ 135 136 u32 ic_servaddr = INADDR_NONE; /* Boot server IP address */ 137 138 u32 root_server_addr = INADDR_NONE; /* Address of NFS server */ 139 u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 140 141 /* Persistent data: */ 142 143 static int ic_proto_used; /* Protocol used, if any */ 144 static u32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 145 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 146 147 /* 148 * Private state. 149 */ 150 151 /* Name of user-selected boot device */ 152 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 153 154 /* Protocols supported by available interfaces */ 155 static int ic_proto_have_if __initdata = 0; 156 157 #ifdef IPCONFIG_DYNAMIC 158 static DEFINE_SPINLOCK(ic_recv_lock); 159 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */ 160 #endif 161 #ifdef IPCONFIG_DHCP 162 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */ 163 #endif 164 165 166 /* 167 * Network devices 168 */ 169 170 struct ic_device { 171 struct ic_device *next; 172 struct net_device *dev; 173 unsigned short flags; 174 short able; 175 u32 xid; 176 }; 177 178 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */ 179 static struct net_device *ic_dev __initdata = NULL; /* Selected device */ 180 181 static int __init ic_open_devs(void) 182 { 183 struct ic_device *d, **last; 184 struct net_device *dev; 185 unsigned short oflags; 186 187 last = &ic_first_dev; 188 rtnl_lock(); 189 190 /* bring loopback device up first */ 191 if (dev_change_flags(&loopback_dev, loopback_dev.flags | IFF_UP) < 0) 192 printk(KERN_ERR "IP-Config: Failed to open %s\n", loopback_dev.name); 193 194 for (dev = dev_base; dev; dev = dev->next) { 195 if (dev == &loopback_dev) 196 continue; 197 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 198 (!(dev->flags & IFF_LOOPBACK) && 199 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 200 strncmp(dev->name, "dummy", 5))) { 201 int able = 0; 202 if (dev->mtu >= 364) 203 able |= IC_BOOTP; 204 else 205 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu); 206 if (!(dev->flags & IFF_NOARP)) 207 able |= IC_RARP; 208 able &= ic_proto_enabled; 209 if (ic_proto_enabled && !able) 210 continue; 211 oflags = dev->flags; 212 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 213 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); 214 continue; 215 } 216 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 217 rtnl_unlock(); 218 return -1; 219 } 220 d->dev = dev; 221 *last = d; 222 last = &d->next; 223 d->flags = oflags; 224 d->able = able; 225 if (able & IC_BOOTP) 226 get_random_bytes(&d->xid, sizeof(u32)); 227 else 228 d->xid = 0; 229 ic_proto_have_if |= able; 230 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", 231 dev->name, able, d->xid)); 232 } 233 } 234 rtnl_unlock(); 235 236 *last = NULL; 237 238 if (!ic_first_dev) { 239 if (user_dev_name[0]) 240 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name); 241 else 242 printk(KERN_ERR "IP-Config: No network devices available.\n"); 243 return -1; 244 } 245 return 0; 246 } 247 248 static void __init ic_close_devs(void) 249 { 250 struct ic_device *d, *next; 251 struct net_device *dev; 252 253 rtnl_lock(); 254 next = ic_first_dev; 255 while ((d = next)) { 256 next = d->next; 257 dev = d->dev; 258 if (dev != ic_dev) { 259 DBG(("IP-Config: Downing %s\n", dev->name)); 260 dev_change_flags(dev, d->flags); 261 } 262 kfree(d); 263 } 264 rtnl_unlock(); 265 } 266 267 /* 268 * Interface to various network functions. 269 */ 270 271 static inline void 272 set_sockaddr(struct sockaddr_in *sin, u32 addr, u16 port) 273 { 274 sin->sin_family = AF_INET; 275 sin->sin_addr.s_addr = addr; 276 sin->sin_port = port; 277 } 278 279 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 280 { 281 int res; 282 283 mm_segment_t oldfs = get_fs(); 284 set_fs(get_ds()); 285 res = devinet_ioctl(cmd, (struct ifreq __user *) arg); 286 set_fs(oldfs); 287 return res; 288 } 289 290 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 291 { 292 int res; 293 294 mm_segment_t oldfs = get_fs(); 295 set_fs(get_ds()); 296 res = ip_rt_ioctl(cmd, (void __user *) arg); 297 set_fs(oldfs); 298 return res; 299 } 300 301 /* 302 * Set up interface addresses and routes. 303 */ 304 305 static int __init ic_setup_if(void) 306 { 307 struct ifreq ir; 308 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 309 int err; 310 311 memset(&ir, 0, sizeof(ir)); 312 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); 313 set_sockaddr(sin, ic_myaddr, 0); 314 if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) { 315 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err); 316 return -1; 317 } 318 set_sockaddr(sin, ic_netmask, 0); 319 if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 320 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err); 321 return -1; 322 } 323 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 324 if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 325 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err); 326 return -1; 327 } 328 return 0; 329 } 330 331 static int __init ic_setup_routes(void) 332 { 333 /* No need to setup device routes, only the default route... */ 334 335 if (ic_gateway != INADDR_NONE) { 336 struct rtentry rm; 337 int err; 338 339 memset(&rm, 0, sizeof(rm)); 340 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 341 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n"); 342 return -1; 343 } 344 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 345 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 346 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 347 rm.rt_flags = RTF_UP | RTF_GATEWAY; 348 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 349 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err); 350 return -1; 351 } 352 } 353 354 return 0; 355 } 356 357 /* 358 * Fill in default values for all missing parameters. 359 */ 360 361 static int __init ic_defaults(void) 362 { 363 /* 364 * At this point we have no userspace running so need not 365 * claim locks on system_utsname 366 */ 367 368 if (!ic_host_name_set) 369 sprintf(system_utsname.nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr)); 370 371 if (root_server_addr == INADDR_NONE) 372 root_server_addr = ic_servaddr; 373 374 if (ic_netmask == INADDR_NONE) { 375 if (IN_CLASSA(ntohl(ic_myaddr))) 376 ic_netmask = htonl(IN_CLASSA_NET); 377 else if (IN_CLASSB(ntohl(ic_myaddr))) 378 ic_netmask = htonl(IN_CLASSB_NET); 379 else if (IN_CLASSC(ntohl(ic_myaddr))) 380 ic_netmask = htonl(IN_CLASSC_NET); 381 else { 382 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n", 383 NIPQUAD(ic_myaddr)); 384 return -1; 385 } 386 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask)); 387 } 388 389 return 0; 390 } 391 392 /* 393 * RARP support. 394 */ 395 396 #ifdef IPCONFIG_RARP 397 398 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 399 400 static struct packet_type rarp_packet_type __initdata = { 401 .type = __constant_htons(ETH_P_RARP), 402 .func = ic_rarp_recv, 403 }; 404 405 static inline void ic_rarp_init(void) 406 { 407 dev_add_pack(&rarp_packet_type); 408 } 409 410 static inline void ic_rarp_cleanup(void) 411 { 412 dev_remove_pack(&rarp_packet_type); 413 } 414 415 /* 416 * Process received RARP packet. 417 */ 418 static int __init 419 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 420 { 421 struct arphdr *rarp; 422 unsigned char *rarp_ptr; 423 unsigned long sip, tip; 424 unsigned char *sha, *tha; /* s for "source", t for "target" */ 425 struct ic_device *d; 426 427 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 428 return NET_RX_DROP; 429 430 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 431 goto drop; 432 433 /* Basic sanity checks can be done without the lock. */ 434 rarp = (struct arphdr *)skb->h.raw; 435 436 /* If this test doesn't pass, it's not IP, or we should 437 * ignore it anyway. 438 */ 439 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 440 goto drop; 441 442 /* If it's not a RARP reply, delete it. */ 443 if (rarp->ar_op != htons(ARPOP_RREPLY)) 444 goto drop; 445 446 /* If it's not Ethernet, delete it. */ 447 if (rarp->ar_pro != htons(ETH_P_IP)) 448 goto drop; 449 450 if (!pskb_may_pull(skb, 451 sizeof(struct arphdr) + 452 (2 * dev->addr_len) + 453 (2 * 4))) 454 goto drop; 455 456 /* OK, it is all there and looks valid, process... */ 457 rarp = (struct arphdr *)skb->h.raw; 458 rarp_ptr = (unsigned char *) (rarp + 1); 459 460 /* One reply at a time, please. */ 461 spin_lock(&ic_recv_lock); 462 463 /* If we already have a reply, just drop the packet */ 464 if (ic_got_reply) 465 goto drop_unlock; 466 467 /* Find the ic_device that the packet arrived on */ 468 d = ic_first_dev; 469 while (d && d->dev != dev) 470 d = d->next; 471 if (!d) 472 goto drop_unlock; /* should never happen */ 473 474 /* Extract variable-width fields */ 475 sha = rarp_ptr; 476 rarp_ptr += dev->addr_len; 477 memcpy(&sip, rarp_ptr, 4); 478 rarp_ptr += 4; 479 tha = rarp_ptr; 480 rarp_ptr += dev->addr_len; 481 memcpy(&tip, rarp_ptr, 4); 482 483 /* Discard packets which are not meant for us. */ 484 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 485 goto drop_unlock; 486 487 /* Discard packets which are not from specified server. */ 488 if (ic_servaddr != INADDR_NONE && ic_servaddr != sip) 489 goto drop_unlock; 490 491 /* We have a winner! */ 492 ic_dev = dev; 493 if (ic_myaddr == INADDR_NONE) 494 ic_myaddr = tip; 495 ic_servaddr = sip; 496 ic_got_reply = IC_RARP; 497 498 drop_unlock: 499 /* Show's over. Nothing to see here. */ 500 spin_unlock(&ic_recv_lock); 501 502 drop: 503 /* Throw the packet out. */ 504 kfree_skb(skb); 505 return 0; 506 } 507 508 509 /* 510 * Send RARP request packet over a single interface. 511 */ 512 static void __init ic_rarp_send_if(struct ic_device *d) 513 { 514 struct net_device *dev = d->dev; 515 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 516 dev->dev_addr, dev->dev_addr); 517 } 518 #endif 519 520 /* 521 * DHCP/BOOTP support. 522 */ 523 524 #ifdef IPCONFIG_BOOTP 525 526 struct bootp_pkt { /* BOOTP packet format */ 527 struct iphdr iph; /* IP header */ 528 struct udphdr udph; /* UDP header */ 529 u8 op; /* 1=request, 2=reply */ 530 u8 htype; /* HW address type */ 531 u8 hlen; /* HW address length */ 532 u8 hops; /* Used only by gateways */ 533 u32 xid; /* Transaction ID */ 534 u16 secs; /* Seconds since we started */ 535 u16 flags; /* Just what it says */ 536 u32 client_ip; /* Client's IP address if known */ 537 u32 your_ip; /* Assigned IP address */ 538 u32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 539 u32 relay_ip; /* IP address of BOOTP relay */ 540 u8 hw_addr[16]; /* Client's HW address */ 541 u8 serv_name[64]; /* Server host name */ 542 u8 boot_file[128]; /* Name of boot file */ 543 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 544 }; 545 546 /* packet ops */ 547 #define BOOTP_REQUEST 1 548 #define BOOTP_REPLY 2 549 550 /* DHCP message types */ 551 #define DHCPDISCOVER 1 552 #define DHCPOFFER 2 553 #define DHCPREQUEST 3 554 #define DHCPDECLINE 4 555 #define DHCPACK 5 556 #define DHCPNAK 6 557 #define DHCPRELEASE 7 558 #define DHCPINFORM 8 559 560 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 561 562 static struct packet_type bootp_packet_type __initdata = { 563 .type = __constant_htons(ETH_P_IP), 564 .func = ic_bootp_recv, 565 }; 566 567 568 /* 569 * Initialize DHCP/BOOTP extension fields in the request. 570 */ 571 572 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 573 574 #ifdef IPCONFIG_DHCP 575 576 static void __init 577 ic_dhcp_init_options(u8 *options) 578 { 579 u8 mt = ((ic_servaddr == INADDR_NONE) 580 ? DHCPDISCOVER : DHCPREQUEST); 581 u8 *e = options; 582 583 #ifdef IPCONFIG_DEBUG 584 printk("DHCP: Sending message type %d\n", mt); 585 #endif 586 587 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 588 e += 4; 589 590 *e++ = 53; /* DHCP message type */ 591 *e++ = 1; 592 *e++ = mt; 593 594 if (mt == DHCPREQUEST) { 595 *e++ = 54; /* Server ID (IP address) */ 596 *e++ = 4; 597 memcpy(e, &ic_servaddr, 4); 598 e += 4; 599 600 *e++ = 50; /* Requested IP address */ 601 *e++ = 4; 602 memcpy(e, &ic_myaddr, 4); 603 e += 4; 604 } 605 606 /* always? */ 607 { 608 static const u8 ic_req_params[] = { 609 1, /* Subnet mask */ 610 3, /* Default gateway */ 611 6, /* DNS server */ 612 12, /* Host name */ 613 15, /* Domain name */ 614 17, /* Boot path */ 615 40, /* NIS domain name */ 616 }; 617 618 *e++ = 55; /* Parameter request list */ 619 *e++ = sizeof(ic_req_params); 620 memcpy(e, ic_req_params, sizeof(ic_req_params)); 621 e += sizeof(ic_req_params); 622 } 623 624 *e++ = 255; /* End of the list */ 625 } 626 627 #endif /* IPCONFIG_DHCP */ 628 629 static void __init ic_bootp_init_ext(u8 *e) 630 { 631 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 632 e += 4; 633 *e++ = 1; /* Subnet mask request */ 634 *e++ = 4; 635 e += 4; 636 *e++ = 3; /* Default gateway request */ 637 *e++ = 4; 638 e += 4; 639 *e++ = 5; /* Name server request */ 640 *e++ = 8; 641 e += 8; 642 *e++ = 12; /* Host name request */ 643 *e++ = 32; 644 e += 32; 645 *e++ = 40; /* NIS Domain name request */ 646 *e++ = 32; 647 e += 32; 648 *e++ = 17; /* Boot path */ 649 *e++ = 40; 650 e += 40; 651 652 *e++ = 57; /* set extension buffer size for reply */ 653 *e++ = 2; 654 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 655 *e++ = 150; 656 657 *e++ = 255; /* End of the list */ 658 } 659 660 661 /* 662 * Initialize the DHCP/BOOTP mechanism. 663 */ 664 static inline void ic_bootp_init(void) 665 { 666 int i; 667 668 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 669 ic_nameservers[i] = INADDR_NONE; 670 671 dev_add_pack(&bootp_packet_type); 672 } 673 674 675 /* 676 * DHCP/BOOTP cleanup. 677 */ 678 static inline void ic_bootp_cleanup(void) 679 { 680 dev_remove_pack(&bootp_packet_type); 681 } 682 683 684 /* 685 * Send DHCP/BOOTP request to single interface. 686 */ 687 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 688 { 689 struct net_device *dev = d->dev; 690 struct sk_buff *skb; 691 struct bootp_pkt *b; 692 int hh_len = LL_RESERVED_SPACE(dev); 693 struct iphdr *h; 694 695 /* Allocate packet */ 696 skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL); 697 if (!skb) 698 return; 699 skb_reserve(skb, hh_len); 700 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 701 memset(b, 0, sizeof(struct bootp_pkt)); 702 703 /* Construct IP header */ 704 skb->nh.iph = h = &b->iph; 705 h->version = 4; 706 h->ihl = 5; 707 h->tot_len = htons(sizeof(struct bootp_pkt)); 708 h->frag_off = htons(IP_DF); 709 h->ttl = 64; 710 h->protocol = IPPROTO_UDP; 711 h->daddr = INADDR_BROADCAST; 712 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 713 714 /* Construct UDP header */ 715 b->udph.source = htons(68); 716 b->udph.dest = htons(67); 717 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 718 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 719 720 /* Construct DHCP/BOOTP header */ 721 b->op = BOOTP_REQUEST; 722 if (dev->type < 256) /* check for false types */ 723 b->htype = dev->type; 724 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ 725 b->htype = ARPHRD_IEEE802; 726 else if (dev->type == ARPHRD_FDDI) 727 b->htype = ARPHRD_ETHER; 728 else { 729 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 730 b->htype = dev->type; /* can cause undefined behavior */ 731 } 732 b->hlen = dev->addr_len; 733 b->your_ip = INADDR_NONE; 734 b->server_ip = INADDR_NONE; 735 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 736 b->secs = htons(jiffies_diff / HZ); 737 b->xid = d->xid; 738 739 /* add DHCP options or BOOTP extensions */ 740 #ifdef IPCONFIG_DHCP 741 if (ic_proto_enabled & IC_USE_DHCP) 742 ic_dhcp_init_options(b->exten); 743 else 744 #endif 745 ic_bootp_init_ext(b->exten); 746 747 /* Chain packet down the line... */ 748 skb->dev = dev; 749 skb->protocol = htons(ETH_P_IP); 750 if ((dev->hard_header && 751 dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) || 752 dev_queue_xmit(skb) < 0) 753 printk("E"); 754 } 755 756 757 /* 758 * Copy BOOTP-supplied string if not already set. 759 */ 760 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 761 { 762 if (!len) 763 return 0; 764 if (len > max-1) 765 len = max-1; 766 memcpy(dest, src, len); 767 dest[len] = '\0'; 768 return 1; 769 } 770 771 772 /* 773 * Process BOOTP extensions. 774 */ 775 static void __init ic_do_bootp_ext(u8 *ext) 776 { 777 u8 servers; 778 int i; 779 780 #ifdef IPCONFIG_DEBUG 781 u8 *c; 782 783 printk("DHCP/BOOTP: Got extension %d:",*ext); 784 for(c=ext+2; c<ext+2+ext[1]; c++) 785 printk(" %02x", *c); 786 printk("\n"); 787 #endif 788 789 switch (*ext++) { 790 case 1: /* Subnet mask */ 791 if (ic_netmask == INADDR_NONE) 792 memcpy(&ic_netmask, ext+1, 4); 793 break; 794 case 3: /* Default gateway */ 795 if (ic_gateway == INADDR_NONE) 796 memcpy(&ic_gateway, ext+1, 4); 797 break; 798 case 6: /* DNS server */ 799 servers= *ext/4; 800 if (servers > CONF_NAMESERVERS_MAX) 801 servers = CONF_NAMESERVERS_MAX; 802 for (i = 0; i < servers; i++) { 803 if (ic_nameservers[i] == INADDR_NONE) 804 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 805 } 806 break; 807 case 12: /* Host name */ 808 ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN); 809 ic_host_name_set = 1; 810 break; 811 case 15: /* Domain name (DNS) */ 812 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 813 break; 814 case 17: /* Root path */ 815 if (!root_server_path[0]) 816 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path)); 817 break; 818 case 40: /* NIS Domain name (_not_ DNS) */ 819 ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN); 820 break; 821 } 822 } 823 824 825 /* 826 * Receive BOOTP reply. 827 */ 828 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 829 { 830 struct bootp_pkt *b; 831 struct iphdr *h; 832 struct ic_device *d; 833 int len, ext_len; 834 835 /* Perform verifications before taking the lock. */ 836 if (skb->pkt_type == PACKET_OTHERHOST) 837 goto drop; 838 839 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 840 return NET_RX_DROP; 841 842 if (!pskb_may_pull(skb, 843 sizeof(struct iphdr) + 844 sizeof(struct udphdr))) 845 goto drop; 846 847 b = (struct bootp_pkt *) skb->nh.iph; 848 h = &b->iph; 849 850 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 851 goto drop; 852 853 /* Fragments are not supported */ 854 if (h->frag_off & htons(IP_OFFSET | IP_MF)) { 855 if (net_ratelimit()) 856 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " 857 "reply.\n"); 858 goto drop; 859 } 860 861 if (skb->len < ntohs(h->tot_len)) 862 goto drop; 863 864 if (ip_fast_csum((char *) h, h->ihl)) 865 goto drop; 866 867 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 868 goto drop; 869 870 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 871 goto drop; 872 873 len = ntohs(b->udph.len) - sizeof(struct udphdr); 874 ext_len = len - (sizeof(*b) - 875 sizeof(struct iphdr) - 876 sizeof(struct udphdr) - 877 sizeof(b->exten)); 878 if (ext_len < 0) 879 goto drop; 880 881 /* Ok the front looks good, make sure we can get at the rest. */ 882 if (!pskb_may_pull(skb, skb->len)) 883 goto drop; 884 885 b = (struct bootp_pkt *) skb->nh.iph; 886 h = &b->iph; 887 888 /* One reply at a time, please. */ 889 spin_lock(&ic_recv_lock); 890 891 /* If we already have a reply, just drop the packet */ 892 if (ic_got_reply) 893 goto drop_unlock; 894 895 /* Find the ic_device that the packet arrived on */ 896 d = ic_first_dev; 897 while (d && d->dev != dev) 898 d = d->next; 899 if (!d) 900 goto drop_unlock; /* should never happen */ 901 902 /* Is it a reply to our BOOTP request? */ 903 if (b->op != BOOTP_REPLY || 904 b->xid != d->xid) { 905 if (net_ratelimit()) 906 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " 907 "op[%x] xid[%x]\n", 908 b->op, b->xid); 909 goto drop_unlock; 910 } 911 912 /* Parse extensions */ 913 if (ext_len >= 4 && 914 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 915 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 916 u8 *ext; 917 918 #ifdef IPCONFIG_DHCP 919 if (ic_proto_enabled & IC_USE_DHCP) { 920 u32 server_id = INADDR_NONE; 921 int mt = 0; 922 923 ext = &b->exten[4]; 924 while (ext < end && *ext != 0xff) { 925 u8 *opt = ext++; 926 if (*opt == 0) /* Padding */ 927 continue; 928 ext += *ext + 1; 929 if (ext >= end) 930 break; 931 switch (*opt) { 932 case 53: /* Message type */ 933 if (opt[1]) 934 mt = opt[2]; 935 break; 936 case 54: /* Server ID (IP address) */ 937 if (opt[1] >= 4) 938 memcpy(&server_id, opt + 2, 4); 939 break; 940 }; 941 } 942 943 #ifdef IPCONFIG_DEBUG 944 printk("DHCP: Got message type %d\n", mt); 945 #endif 946 947 switch (mt) { 948 case DHCPOFFER: 949 /* While in the process of accepting one offer, 950 * ignore all others. 951 */ 952 if (ic_myaddr != INADDR_NONE) 953 goto drop_unlock; 954 955 /* Let's accept that offer. */ 956 ic_myaddr = b->your_ip; 957 ic_servaddr = server_id; 958 #ifdef IPCONFIG_DEBUG 959 printk("DHCP: Offered address %u.%u.%u.%u", 960 NIPQUAD(ic_myaddr)); 961 printk(" by server %u.%u.%u.%u\n", 962 NIPQUAD(ic_servaddr)); 963 #endif 964 /* The DHCP indicated server address takes 965 * precedence over the bootp header one if 966 * they are different. 967 */ 968 if ((server_id != INADDR_NONE) && 969 (b->server_ip != server_id)) 970 b->server_ip = ic_servaddr; 971 break; 972 973 case DHCPACK: 974 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 975 goto drop_unlock; 976 977 /* Yeah! */ 978 break; 979 980 default: 981 /* Urque. Forget it*/ 982 ic_myaddr = INADDR_NONE; 983 ic_servaddr = INADDR_NONE; 984 goto drop_unlock; 985 }; 986 987 ic_dhcp_msgtype = mt; 988 989 } 990 #endif /* IPCONFIG_DHCP */ 991 992 ext = &b->exten[4]; 993 while (ext < end && *ext != 0xff) { 994 u8 *opt = ext++; 995 if (*opt == 0) /* Padding */ 996 continue; 997 ext += *ext + 1; 998 if (ext < end) 999 ic_do_bootp_ext(opt); 1000 } 1001 } 1002 1003 /* We have a winner! */ 1004 ic_dev = dev; 1005 ic_myaddr = b->your_ip; 1006 ic_servaddr = b->server_ip; 1007 if (ic_gateway == INADDR_NONE && b->relay_ip) 1008 ic_gateway = b->relay_ip; 1009 if (ic_nameservers[0] == INADDR_NONE) 1010 ic_nameservers[0] = ic_servaddr; 1011 ic_got_reply = IC_BOOTP; 1012 1013 drop_unlock: 1014 /* Show's over. Nothing to see here. */ 1015 spin_unlock(&ic_recv_lock); 1016 1017 drop: 1018 /* Throw the packet out. */ 1019 kfree_skb(skb); 1020 1021 return 0; 1022 } 1023 1024 1025 #endif 1026 1027 1028 /* 1029 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1030 */ 1031 1032 #ifdef IPCONFIG_DYNAMIC 1033 1034 static int __init ic_dynamic(void) 1035 { 1036 int retries; 1037 struct ic_device *d; 1038 unsigned long start_jiffies, timeout, jiff; 1039 int do_bootp = ic_proto_have_if & IC_BOOTP; 1040 int do_rarp = ic_proto_have_if & IC_RARP; 1041 1042 /* 1043 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1044 * This routine gets only called when some pieces of information 1045 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1046 */ 1047 if (!ic_proto_enabled) { 1048 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1049 return -1; 1050 } 1051 1052 #ifdef IPCONFIG_BOOTP 1053 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1054 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); 1055 #endif 1056 #ifdef IPCONFIG_RARP 1057 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1058 printk(KERN_ERR "RARP: No suitable device found.\n"); 1059 #endif 1060 1061 if (!ic_proto_have_if) 1062 /* Error message already printed */ 1063 return -1; 1064 1065 /* 1066 * Setup protocols 1067 */ 1068 #ifdef IPCONFIG_BOOTP 1069 if (do_bootp) 1070 ic_bootp_init(); 1071 #endif 1072 #ifdef IPCONFIG_RARP 1073 if (do_rarp) 1074 ic_rarp_init(); 1075 #endif 1076 1077 /* 1078 * Send requests and wait, until we get an answer. This loop 1079 * seems to be a terrible waste of CPU time, but actually there is 1080 * only one process running at all, so we don't need to use any 1081 * scheduler functions. 1082 * [Actually we could now, but the nothing else running note still 1083 * applies.. - AC] 1084 */ 1085 printk(KERN_NOTICE "Sending %s%s%s requests .", 1086 do_bootp 1087 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1088 (do_bootp && do_rarp) ? " and " : "", 1089 do_rarp ? "RARP" : ""); 1090 1091 start_jiffies = jiffies; 1092 d = ic_first_dev; 1093 retries = CONF_SEND_RETRIES; 1094 get_random_bytes(&timeout, sizeof(timeout)); 1095 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); 1096 for(;;) { 1097 #ifdef IPCONFIG_BOOTP 1098 if (do_bootp && (d->able & IC_BOOTP)) 1099 ic_bootp_send_if(d, jiffies - start_jiffies); 1100 #endif 1101 #ifdef IPCONFIG_RARP 1102 if (do_rarp && (d->able & IC_RARP)) 1103 ic_rarp_send_if(d); 1104 #endif 1105 1106 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1107 while (time_before(jiffies, jiff) && !ic_got_reply) 1108 schedule_timeout_uninterruptible(1); 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 ic_myaddr = INADDR_NONE; 1154 return -1; 1155 } 1156 1157 printk("IP-Config: Got %s answer from %u.%u.%u.%u, ", 1158 ((ic_got_reply & IC_RARP) ? "RARP" 1159 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1160 NIPQUAD(ic_servaddr)); 1161 printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr)); 1162 1163 return 0; 1164 } 1165 1166 #endif /* IPCONFIG_DYNAMIC */ 1167 1168 #ifdef CONFIG_PROC_FS 1169 1170 static int pnp_seq_show(struct seq_file *seq, void *v) 1171 { 1172 int i; 1173 1174 if (ic_proto_used & IC_PROTO) 1175 seq_printf(seq, "#PROTO: %s\n", 1176 (ic_proto_used & IC_RARP) ? "RARP" 1177 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1178 else 1179 seq_puts(seq, "#MANUAL\n"); 1180 1181 if (ic_domain[0]) 1182 seq_printf(seq, 1183 "domain %s\n", ic_domain); 1184 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1185 if (ic_nameservers[i] != INADDR_NONE) 1186 seq_printf(seq, 1187 "nameserver %u.%u.%u.%u\n", 1188 NIPQUAD(ic_nameservers[i])); 1189 } 1190 if (ic_servaddr != INADDR_NONE) 1191 seq_printf(seq, 1192 "bootserver %u.%u.%u.%u\n", 1193 NIPQUAD(ic_servaddr)); 1194 return 0; 1195 } 1196 1197 static int pnp_seq_open(struct inode *indoe, struct file *file) 1198 { 1199 return single_open(file, pnp_seq_show, NULL); 1200 } 1201 1202 static struct file_operations pnp_seq_fops = { 1203 .owner = THIS_MODULE, 1204 .open = pnp_seq_open, 1205 .read = seq_read, 1206 .llseek = seq_lseek, 1207 .release = single_release, 1208 }; 1209 #endif /* CONFIG_PROC_FS */ 1210 1211 /* 1212 * Extract IP address from the parameter string if needed. Note that we 1213 * need to have root_server_addr set _before_ IPConfig gets called as it 1214 * can override it. 1215 */ 1216 u32 __init root_nfs_parse_addr(char *name) 1217 { 1218 u32 addr; 1219 int octets = 0; 1220 char *cp, *cq; 1221 1222 cp = cq = name; 1223 while (octets < 4) { 1224 while (*cp >= '0' && *cp <= '9') 1225 cp++; 1226 if (cp == cq || cp - cq > 3) 1227 break; 1228 if (*cp == '.' || octets == 3) 1229 octets++; 1230 if (octets < 4) 1231 cp++; 1232 cq = cp; 1233 } 1234 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1235 if (*cp == ':') 1236 *cp++ = '\0'; 1237 addr = in_aton(name); 1238 memmove(name, cp, strlen(cp) + 1); 1239 } else 1240 addr = INADDR_NONE; 1241 1242 return addr; 1243 } 1244 1245 /* 1246 * IP Autoconfig dispatcher. 1247 */ 1248 1249 static int __init ip_auto_config(void) 1250 { 1251 u32 addr; 1252 1253 #ifdef CONFIG_PROC_FS 1254 proc_net_fops_create("pnp", S_IRUGO, &pnp_seq_fops); 1255 #endif /* CONFIG_PROC_FS */ 1256 1257 if (!ic_enable) 1258 return 0; 1259 1260 DBG(("IP-Config: Entered.\n")); 1261 #ifdef IPCONFIG_DYNAMIC 1262 try_try_again: 1263 #endif 1264 /* Give hardware a chance to settle */ 1265 msleep(CONF_PRE_OPEN); 1266 1267 /* Setup all network devices */ 1268 if (ic_open_devs() < 0) 1269 return -1; 1270 1271 /* Give drivers a chance to settle */ 1272 ssleep(CONF_POST_OPEN); 1273 1274 /* 1275 * If the config information is insufficient (e.g., our IP address or 1276 * IP address of the boot server is missing or we have multiple network 1277 * interfaces and no default was set), use BOOTP or RARP to get the 1278 * missing values. 1279 */ 1280 if (ic_myaddr == INADDR_NONE || 1281 #ifdef CONFIG_ROOT_NFS 1282 (MAJOR(ROOT_DEV) == UNNAMED_MAJOR 1283 && root_server_addr == INADDR_NONE 1284 && ic_servaddr == INADDR_NONE) || 1285 #endif 1286 ic_first_dev->next) { 1287 #ifdef IPCONFIG_DYNAMIC 1288 1289 int retries = CONF_OPEN_RETRIES; 1290 1291 if (ic_dynamic() < 0) { 1292 ic_close_devs(); 1293 1294 /* 1295 * I don't know why, but sometimes the 1296 * eepro100 driver (at least) gets upset and 1297 * doesn't work the first time it's opened. 1298 * But then if you close it and reopen it, it 1299 * works just fine. So we need to try that at 1300 * least once before giving up. 1301 * 1302 * Also, if the root will be NFS-mounted, we 1303 * have nowhere to go if DHCP fails. So we 1304 * just have to keep trying forever. 1305 * 1306 * -- Chip 1307 */ 1308 #ifdef CONFIG_ROOT_NFS 1309 if (ROOT_DEV == Root_NFS) { 1310 printk(KERN_ERR 1311 "IP-Config: Retrying forever (NFS root)...\n"); 1312 goto try_try_again; 1313 } 1314 #endif 1315 1316 if (--retries) { 1317 printk(KERN_ERR 1318 "IP-Config: Reopening network devices...\n"); 1319 goto try_try_again; 1320 } 1321 1322 /* Oh, well. At least we tried. */ 1323 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); 1324 return -1; 1325 } 1326 #else /* !DYNAMIC */ 1327 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1328 ic_close_devs(); 1329 return -1; 1330 #endif /* IPCONFIG_DYNAMIC */ 1331 } else { 1332 /* Device selected manually or only one device -> use it */ 1333 ic_dev = ic_first_dev->dev; 1334 } 1335 1336 addr = root_nfs_parse_addr(root_server_path); 1337 if (root_server_addr == INADDR_NONE) 1338 root_server_addr = addr; 1339 1340 /* 1341 * Use defaults whereever applicable. 1342 */ 1343 if (ic_defaults() < 0) 1344 return -1; 1345 1346 /* 1347 * Close all network devices except the device we've 1348 * autoconfigured and set up routes. 1349 */ 1350 ic_close_devs(); 1351 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1352 return -1; 1353 1354 /* 1355 * Record which protocol was actually used. 1356 */ 1357 #ifdef IPCONFIG_DYNAMIC 1358 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1359 #endif 1360 1361 #ifndef IPCONFIG_SILENT 1362 /* 1363 * Clue in the operator. 1364 */ 1365 printk("IP-Config: Complete:"); 1366 printk("\n device=%s", ic_dev->name); 1367 printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr)); 1368 printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask)); 1369 printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway)); 1370 printk(",\n host=%s, domain=%s, nis-domain=%s", 1371 system_utsname.nodename, ic_domain, system_utsname.domainname); 1372 printk(",\n bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr)); 1373 printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr)); 1374 printk(", rootpath=%s", root_server_path); 1375 printk("\n"); 1376 #endif /* !SILENT */ 1377 1378 return 0; 1379 } 1380 1381 late_initcall(ip_auto_config); 1382 1383 1384 /* 1385 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1386 * command line parameter. It consists of option fields separated by colons in 1387 * the following order: 1388 * 1389 * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO> 1390 * 1391 * Any of the fields can be empty which means to use a default value: 1392 * <client-ip> - address given by BOOTP or RARP 1393 * <server-ip> - address of host returning BOOTP or RARP packet 1394 * <gw-ip> - none, or the address returned by BOOTP 1395 * <netmask> - automatically determined from <client-ip>, or the 1396 * one returned by BOOTP 1397 * <host name> - <client-ip> in ASCII notation, or the name returned 1398 * by BOOTP 1399 * <device> - use all available devices 1400 * <PROTO>: 1401 * off|none - don't do autoconfig at all (DEFAULT) 1402 * on|any - use any configured protocol 1403 * dhcp|bootp|rarp - use only the specified protocol 1404 * both - use both BOOTP and RARP (not DHCP) 1405 */ 1406 static int __init ic_proto_name(char *name) 1407 { 1408 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1409 return 1; 1410 } 1411 #ifdef CONFIG_IP_PNP_DHCP 1412 else if (!strcmp(name, "dhcp")) { 1413 ic_proto_enabled &= ~IC_RARP; 1414 return 1; 1415 } 1416 #endif 1417 #ifdef CONFIG_IP_PNP_BOOTP 1418 else if (!strcmp(name, "bootp")) { 1419 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1420 return 1; 1421 } 1422 #endif 1423 #ifdef CONFIG_IP_PNP_RARP 1424 else if (!strcmp(name, "rarp")) { 1425 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1426 return 1; 1427 } 1428 #endif 1429 #ifdef IPCONFIG_DYNAMIC 1430 else if (!strcmp(name, "both")) { 1431 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1432 return 1; 1433 } 1434 #endif 1435 return 0; 1436 } 1437 1438 static int __init ip_auto_config_setup(char *addrs) 1439 { 1440 char *cp, *ip, *dp; 1441 int num = 0; 1442 1443 ic_set_manually = 1; 1444 1445 ic_enable = (*addrs && 1446 (strcmp(addrs, "off") != 0) && 1447 (strcmp(addrs, "none") != 0)); 1448 if (!ic_enable) 1449 return 1; 1450 1451 if (ic_proto_name(addrs)) 1452 return 1; 1453 1454 /* Parse the whole string */ 1455 ip = addrs; 1456 while (ip && *ip) { 1457 if ((cp = strchr(ip, ':'))) 1458 *cp++ = '\0'; 1459 if (strlen(ip) > 0) { 1460 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); 1461 switch (num) { 1462 case 0: 1463 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY) 1464 ic_myaddr = INADDR_NONE; 1465 break; 1466 case 1: 1467 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY) 1468 ic_servaddr = INADDR_NONE; 1469 break; 1470 case 2: 1471 if ((ic_gateway = in_aton(ip)) == INADDR_ANY) 1472 ic_gateway = INADDR_NONE; 1473 break; 1474 case 3: 1475 if ((ic_netmask = in_aton(ip)) == INADDR_ANY) 1476 ic_netmask = INADDR_NONE; 1477 break; 1478 case 4: 1479 if ((dp = strchr(ip, '.'))) { 1480 *dp++ = '\0'; 1481 strlcpy(system_utsname.domainname, dp, 1482 sizeof(system_utsname.domainname)); 1483 } 1484 strlcpy(system_utsname.nodename, ip, 1485 sizeof(system_utsname.nodename)); 1486 ic_host_name_set = 1; 1487 break; 1488 case 5: 1489 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1490 break; 1491 case 6: 1492 ic_proto_name(ip); 1493 break; 1494 } 1495 } 1496 ip = cp; 1497 num++; 1498 } 1499 1500 return 1; 1501 } 1502 1503 static int __init nfsaddrs_config_setup(char *addrs) 1504 { 1505 return ip_auto_config_setup(addrs); 1506 } 1507 1508 __setup("ip=", ip_auto_config_setup); 1509 __setup("nfsaddrs=", nfsaddrs_config_setup); 1510