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 <linux/nfs_fs.h> 58 #include <net/arp.h> 59 #include <net/ip.h> 60 #include <net/ipconfig.h> 61 62 #include <asm/uaccess.h> 63 #include <net/checksum.h> 64 #include <asm/processor.h> 65 66 /* Define this to allow debugging output */ 67 #undef IPCONFIG_DEBUG 68 69 #ifdef IPCONFIG_DEBUG 70 #define DBG(x) printk x 71 #else 72 #define DBG(x) do { } while(0) 73 #endif 74 75 #if defined(CONFIG_IP_PNP_DHCP) 76 #define IPCONFIG_DHCP 77 #endif 78 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) 79 #define IPCONFIG_BOOTP 80 #endif 81 #if defined(CONFIG_IP_PNP_RARP) 82 #define IPCONFIG_RARP 83 #endif 84 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) 85 #define IPCONFIG_DYNAMIC 86 #endif 87 88 /* Define the friendly delay before and after opening net devices */ 89 #define CONF_PRE_OPEN 500 /* Before opening: 1/2 second */ 90 #define CONF_POST_OPEN 1 /* After opening: 1 second */ 91 92 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ 93 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ 94 #define CONF_SEND_RETRIES 6 /* Send six requests per open */ 95 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */ 96 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ 97 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ 98 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ 99 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ 100 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers 101 - '3' from resolv.h */ 102 103 104 /* 105 * Public IP configuration 106 */ 107 108 /* This is used by platforms which might be able to set the ipconfig 109 * variables using firmware environment vars. If this is set, it will 110 * ignore such firmware variables. 111 */ 112 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ 113 114 static int ic_enable __initdata = 0; /* IP config enabled? */ 115 116 /* Protocol choice */ 117 int ic_proto_enabled __initdata = 0 118 #ifdef IPCONFIG_BOOTP 119 | IC_BOOTP 120 #endif 121 #ifdef CONFIG_IP_PNP_DHCP 122 | IC_USE_DHCP 123 #endif 124 #ifdef IPCONFIG_RARP 125 | IC_RARP 126 #endif 127 ; 128 129 static int ic_host_name_set __initdata = 0; /* Host name set by us? */ 130 131 u32 ic_myaddr = INADDR_NONE; /* My IP address */ 132 static u32 ic_netmask = INADDR_NONE; /* Netmask for local subnet */ 133 u32 ic_gateway = INADDR_NONE; /* Gateway IP address */ 134 135 u32 ic_servaddr = INADDR_NONE; /* Boot server IP address */ 136 137 u32 root_server_addr = INADDR_NONE; /* Address of NFS server */ 138 u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 139 140 /* Persistent data: */ 141 142 static int ic_proto_used; /* Protocol used, if any */ 143 static u32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 144 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 145 146 /* 147 * Private state. 148 */ 149 150 /* Name of user-selected boot device */ 151 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 152 153 /* Protocols supported by available interfaces */ 154 static int ic_proto_have_if __initdata = 0; 155 156 #ifdef IPCONFIG_DYNAMIC 157 static DEFINE_SPINLOCK(ic_recv_lock); 158 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */ 159 #endif 160 #ifdef IPCONFIG_DHCP 161 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */ 162 #endif 163 164 165 /* 166 * Network devices 167 */ 168 169 struct ic_device { 170 struct ic_device *next; 171 struct net_device *dev; 172 unsigned short flags; 173 short able; 174 u32 xid; 175 }; 176 177 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */ 178 static struct net_device *ic_dev __initdata = NULL; /* Selected device */ 179 180 static int __init ic_open_devs(void) 181 { 182 struct ic_device *d, **last; 183 struct net_device *dev; 184 unsigned short oflags; 185 186 last = &ic_first_dev; 187 rtnl_shlock(); 188 189 /* bring loopback device up first */ 190 if (dev_change_flags(&loopback_dev, loopback_dev.flags | IFF_UP) < 0) 191 printk(KERN_ERR "IP-Config: Failed to open %s\n", loopback_dev.name); 192 193 for (dev = dev_base; dev; dev = dev->next) { 194 if (dev == &loopback_dev) 195 continue; 196 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 197 (!(dev->flags & IFF_LOOPBACK) && 198 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 199 strncmp(dev->name, "dummy", 5))) { 200 int able = 0; 201 if (dev->mtu >= 364) 202 able |= IC_BOOTP; 203 else 204 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu); 205 if (!(dev->flags & IFF_NOARP)) 206 able |= IC_RARP; 207 able &= ic_proto_enabled; 208 if (ic_proto_enabled && !able) 209 continue; 210 oflags = dev->flags; 211 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 212 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); 213 continue; 214 } 215 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 216 rtnl_shunlock(); 217 return -1; 218 } 219 d->dev = dev; 220 *last = d; 221 last = &d->next; 222 d->flags = oflags; 223 d->able = able; 224 if (able & IC_BOOTP) 225 get_random_bytes(&d->xid, sizeof(u32)); 226 else 227 d->xid = 0; 228 ic_proto_have_if |= able; 229 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", 230 dev->name, able, d->xid)); 231 } 232 } 233 rtnl_shunlock(); 234 235 *last = NULL; 236 237 if (!ic_first_dev) { 238 if (user_dev_name[0]) 239 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name); 240 else 241 printk(KERN_ERR "IP-Config: No network devices available.\n"); 242 return -1; 243 } 244 return 0; 245 } 246 247 static void __init ic_close_devs(void) 248 { 249 struct ic_device *d, *next; 250 struct net_device *dev; 251 252 rtnl_shlock(); 253 next = ic_first_dev; 254 while ((d = next)) { 255 next = d->next; 256 dev = d->dev; 257 if (dev != ic_dev) { 258 DBG(("IP-Config: Downing %s\n", dev->name)); 259 dev_change_flags(dev, d->flags); 260 } 261 kfree(d); 262 } 263 rtnl_shunlock(); 264 } 265 266 /* 267 * Interface to various network functions. 268 */ 269 270 static inline void 271 set_sockaddr(struct sockaddr_in *sin, u32 addr, u16 port) 272 { 273 sin->sin_family = AF_INET; 274 sin->sin_addr.s_addr = addr; 275 sin->sin_port = port; 276 } 277 278 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 279 { 280 int res; 281 282 mm_segment_t oldfs = get_fs(); 283 set_fs(get_ds()); 284 res = devinet_ioctl(cmd, (struct ifreq __user *) arg); 285 set_fs(oldfs); 286 return res; 287 } 288 289 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 290 { 291 int res; 292 293 mm_segment_t oldfs = get_fs(); 294 set_fs(get_ds()); 295 res = ip_rt_ioctl(cmd, (void __user *) arg); 296 set_fs(oldfs); 297 return res; 298 } 299 300 /* 301 * Set up interface addresses and routes. 302 */ 303 304 static int __init ic_setup_if(void) 305 { 306 struct ifreq ir; 307 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 308 int err; 309 310 memset(&ir, 0, sizeof(ir)); 311 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); 312 set_sockaddr(sin, ic_myaddr, 0); 313 if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) { 314 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err); 315 return -1; 316 } 317 set_sockaddr(sin, ic_netmask, 0); 318 if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 319 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err); 320 return -1; 321 } 322 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 323 if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 324 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err); 325 return -1; 326 } 327 return 0; 328 } 329 330 static int __init ic_setup_routes(void) 331 { 332 /* No need to setup device routes, only the default route... */ 333 334 if (ic_gateway != INADDR_NONE) { 335 struct rtentry rm; 336 int err; 337 338 memset(&rm, 0, sizeof(rm)); 339 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 340 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n"); 341 return -1; 342 } 343 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 344 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 345 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 346 rm.rt_flags = RTF_UP | RTF_GATEWAY; 347 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 348 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err); 349 return -1; 350 } 351 } 352 353 return 0; 354 } 355 356 /* 357 * Fill in default values for all missing parameters. 358 */ 359 360 static int __init ic_defaults(void) 361 { 362 /* 363 * At this point we have no userspace running so need not 364 * claim locks on system_utsname 365 */ 366 367 if (!ic_host_name_set) 368 sprintf(system_utsname.nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr)); 369 370 if (root_server_addr == INADDR_NONE) 371 root_server_addr = ic_servaddr; 372 373 if (ic_netmask == INADDR_NONE) { 374 if (IN_CLASSA(ntohl(ic_myaddr))) 375 ic_netmask = htonl(IN_CLASSA_NET); 376 else if (IN_CLASSB(ntohl(ic_myaddr))) 377 ic_netmask = htonl(IN_CLASSB_NET); 378 else if (IN_CLASSC(ntohl(ic_myaddr))) 379 ic_netmask = htonl(IN_CLASSC_NET); 380 else { 381 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n", 382 NIPQUAD(ic_myaddr)); 383 return -1; 384 } 385 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask)); 386 } 387 388 return 0; 389 } 390 391 /* 392 * RARP support. 393 */ 394 395 #ifdef IPCONFIG_RARP 396 397 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 398 399 static struct packet_type rarp_packet_type __initdata = { 400 .type = __constant_htons(ETH_P_RARP), 401 .func = ic_rarp_recv, 402 }; 403 404 static inline void ic_rarp_init(void) 405 { 406 dev_add_pack(&rarp_packet_type); 407 } 408 409 static inline void ic_rarp_cleanup(void) 410 { 411 dev_remove_pack(&rarp_packet_type); 412 } 413 414 /* 415 * Process received RARP packet. 416 */ 417 static int __init 418 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 419 { 420 struct arphdr *rarp; 421 unsigned char *rarp_ptr; 422 unsigned long sip, tip; 423 unsigned char *sha, *tha; /* s for "source", t for "target" */ 424 struct ic_device *d; 425 426 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 427 return NET_RX_DROP; 428 429 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 430 goto drop; 431 432 /* Basic sanity checks can be done without the lock. */ 433 rarp = (struct arphdr *)skb->h.raw; 434 435 /* If this test doesn't pass, it's not IP, or we should 436 * ignore it anyway. 437 */ 438 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 439 goto drop; 440 441 /* If it's not a RARP reply, delete it. */ 442 if (rarp->ar_op != htons(ARPOP_RREPLY)) 443 goto drop; 444 445 /* If it's not Ethernet, delete it. */ 446 if (rarp->ar_pro != htons(ETH_P_IP)) 447 goto drop; 448 449 if (!pskb_may_pull(skb, 450 sizeof(struct arphdr) + 451 (2 * dev->addr_len) + 452 (2 * 4))) 453 goto drop; 454 455 /* OK, it is all there and looks valid, process... */ 456 rarp = (struct arphdr *)skb->h.raw; 457 rarp_ptr = (unsigned char *) (rarp + 1); 458 459 /* One reply at a time, please. */ 460 spin_lock(&ic_recv_lock); 461 462 /* If we already have a reply, just drop the packet */ 463 if (ic_got_reply) 464 goto drop_unlock; 465 466 /* Find the ic_device that the packet arrived on */ 467 d = ic_first_dev; 468 while (d && d->dev != dev) 469 d = d->next; 470 if (!d) 471 goto drop_unlock; /* should never happen */ 472 473 /* Extract variable-width fields */ 474 sha = rarp_ptr; 475 rarp_ptr += dev->addr_len; 476 memcpy(&sip, rarp_ptr, 4); 477 rarp_ptr += 4; 478 tha = rarp_ptr; 479 rarp_ptr += dev->addr_len; 480 memcpy(&tip, rarp_ptr, 4); 481 482 /* Discard packets which are not meant for us. */ 483 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 484 goto drop_unlock; 485 486 /* Discard packets which are not from specified server. */ 487 if (ic_servaddr != INADDR_NONE && ic_servaddr != sip) 488 goto drop_unlock; 489 490 /* We have a winner! */ 491 ic_dev = dev; 492 if (ic_myaddr == INADDR_NONE) 493 ic_myaddr = tip; 494 ic_servaddr = sip; 495 ic_got_reply = IC_RARP; 496 497 drop_unlock: 498 /* Show's over. Nothing to see here. */ 499 spin_unlock(&ic_recv_lock); 500 501 drop: 502 /* Throw the packet out. */ 503 kfree_skb(skb); 504 return 0; 505 } 506 507 508 /* 509 * Send RARP request packet over a single interface. 510 */ 511 static void __init ic_rarp_send_if(struct ic_device *d) 512 { 513 struct net_device *dev = d->dev; 514 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 515 dev->dev_addr, dev->dev_addr); 516 } 517 #endif 518 519 /* 520 * DHCP/BOOTP support. 521 */ 522 523 #ifdef IPCONFIG_BOOTP 524 525 struct bootp_pkt { /* BOOTP packet format */ 526 struct iphdr iph; /* IP header */ 527 struct udphdr udph; /* UDP header */ 528 u8 op; /* 1=request, 2=reply */ 529 u8 htype; /* HW address type */ 530 u8 hlen; /* HW address length */ 531 u8 hops; /* Used only by gateways */ 532 u32 xid; /* Transaction ID */ 533 u16 secs; /* Seconds since we started */ 534 u16 flags; /* Just what it says */ 535 u32 client_ip; /* Client's IP address if known */ 536 u32 your_ip; /* Assigned IP address */ 537 u32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 538 u32 relay_ip; /* IP address of BOOTP relay */ 539 u8 hw_addr[16]; /* Client's HW address */ 540 u8 serv_name[64]; /* Server host name */ 541 u8 boot_file[128]; /* Name of boot file */ 542 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 543 }; 544 545 /* packet ops */ 546 #define BOOTP_REQUEST 1 547 #define BOOTP_REPLY 2 548 549 /* DHCP message types */ 550 #define DHCPDISCOVER 1 551 #define DHCPOFFER 2 552 #define DHCPREQUEST 3 553 #define DHCPDECLINE 4 554 #define DHCPACK 5 555 #define DHCPNAK 6 556 #define DHCPRELEASE 7 557 #define DHCPINFORM 8 558 559 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 560 561 static struct packet_type bootp_packet_type __initdata = { 562 .type = __constant_htons(ETH_P_IP), 563 .func = ic_bootp_recv, 564 }; 565 566 567 /* 568 * Initialize DHCP/BOOTP extension fields in the request. 569 */ 570 571 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 572 573 #ifdef IPCONFIG_DHCP 574 575 static void __init 576 ic_dhcp_init_options(u8 *options) 577 { 578 u8 mt = ((ic_servaddr == INADDR_NONE) 579 ? DHCPDISCOVER : DHCPREQUEST); 580 u8 *e = options; 581 582 #ifdef IPCONFIG_DEBUG 583 printk("DHCP: Sending message type %d\n", mt); 584 #endif 585 586 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 587 e += 4; 588 589 *e++ = 53; /* DHCP message type */ 590 *e++ = 1; 591 *e++ = mt; 592 593 if (mt == DHCPREQUEST) { 594 *e++ = 54; /* Server ID (IP address) */ 595 *e++ = 4; 596 memcpy(e, &ic_servaddr, 4); 597 e += 4; 598 599 *e++ = 50; /* Requested IP address */ 600 *e++ = 4; 601 memcpy(e, &ic_myaddr, 4); 602 e += 4; 603 } 604 605 /* always? */ 606 { 607 static const u8 ic_req_params[] = { 608 1, /* Subnet mask */ 609 3, /* Default gateway */ 610 6, /* DNS server */ 611 12, /* Host name */ 612 15, /* Domain name */ 613 17, /* Boot path */ 614 40, /* NIS domain name */ 615 }; 616 617 *e++ = 55; /* Parameter request list */ 618 *e++ = sizeof(ic_req_params); 619 memcpy(e, ic_req_params, sizeof(ic_req_params)); 620 e += sizeof(ic_req_params); 621 } 622 623 *e++ = 255; /* End of the list */ 624 } 625 626 #endif /* IPCONFIG_DHCP */ 627 628 static void __init ic_bootp_init_ext(u8 *e) 629 { 630 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 631 e += 4; 632 *e++ = 1; /* Subnet mask request */ 633 *e++ = 4; 634 e += 4; 635 *e++ = 3; /* Default gateway request */ 636 *e++ = 4; 637 e += 4; 638 *e++ = 5; /* Name server request */ 639 *e++ = 8; 640 e += 8; 641 *e++ = 12; /* Host name request */ 642 *e++ = 32; 643 e += 32; 644 *e++ = 40; /* NIS Domain name request */ 645 *e++ = 32; 646 e += 32; 647 *e++ = 17; /* Boot path */ 648 *e++ = 40; 649 e += 40; 650 651 *e++ = 57; /* set extension buffer size for reply */ 652 *e++ = 2; 653 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 654 *e++ = 150; 655 656 *e++ = 255; /* End of the list */ 657 } 658 659 660 /* 661 * Initialize the DHCP/BOOTP mechanism. 662 */ 663 static inline void ic_bootp_init(void) 664 { 665 int i; 666 667 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 668 ic_nameservers[i] = INADDR_NONE; 669 670 dev_add_pack(&bootp_packet_type); 671 } 672 673 674 /* 675 * DHCP/BOOTP cleanup. 676 */ 677 static inline void ic_bootp_cleanup(void) 678 { 679 dev_remove_pack(&bootp_packet_type); 680 } 681 682 683 /* 684 * Send DHCP/BOOTP request to single interface. 685 */ 686 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 687 { 688 struct net_device *dev = d->dev; 689 struct sk_buff *skb; 690 struct bootp_pkt *b; 691 int hh_len = LL_RESERVED_SPACE(dev); 692 struct iphdr *h; 693 694 /* Allocate packet */ 695 skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL); 696 if (!skb) 697 return; 698 skb_reserve(skb, hh_len); 699 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 700 memset(b, 0, sizeof(struct bootp_pkt)); 701 702 /* Construct IP header */ 703 skb->nh.iph = h = &b->iph; 704 h->version = 4; 705 h->ihl = 5; 706 h->tot_len = htons(sizeof(struct bootp_pkt)); 707 h->frag_off = htons(IP_DF); 708 h->ttl = 64; 709 h->protocol = IPPROTO_UDP; 710 h->daddr = INADDR_BROADCAST; 711 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 712 713 /* Construct UDP header */ 714 b->udph.source = htons(68); 715 b->udph.dest = htons(67); 716 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 717 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 718 719 /* Construct DHCP/BOOTP header */ 720 b->op = BOOTP_REQUEST; 721 if (dev->type < 256) /* check for false types */ 722 b->htype = dev->type; 723 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ 724 b->htype = ARPHRD_IEEE802; 725 else if (dev->type == ARPHRD_FDDI) 726 b->htype = ARPHRD_ETHER; 727 else { 728 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 729 b->htype = dev->type; /* can cause undefined behavior */ 730 } 731 b->hlen = dev->addr_len; 732 b->your_ip = INADDR_NONE; 733 b->server_ip = INADDR_NONE; 734 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 735 b->secs = htons(jiffies_diff / HZ); 736 b->xid = d->xid; 737 738 /* add DHCP options or BOOTP extensions */ 739 #ifdef IPCONFIG_DHCP 740 if (ic_proto_enabled & IC_USE_DHCP) 741 ic_dhcp_init_options(b->exten); 742 else 743 #endif 744 ic_bootp_init_ext(b->exten); 745 746 /* Chain packet down the line... */ 747 skb->dev = dev; 748 skb->protocol = htons(ETH_P_IP); 749 if ((dev->hard_header && 750 dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) || 751 dev_queue_xmit(skb) < 0) 752 printk("E"); 753 } 754 755 756 /* 757 * Copy BOOTP-supplied string if not already set. 758 */ 759 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 760 { 761 if (!len) 762 return 0; 763 if (len > max-1) 764 len = max-1; 765 memcpy(dest, src, len); 766 dest[len] = '\0'; 767 return 1; 768 } 769 770 771 /* 772 * Process BOOTP extensions. 773 */ 774 static void __init ic_do_bootp_ext(u8 *ext) 775 { 776 u8 servers; 777 int i; 778 779 #ifdef IPCONFIG_DEBUG 780 u8 *c; 781 782 printk("DHCP/BOOTP: Got extension %d:",*ext); 783 for(c=ext+2; c<ext+2+ext[1]; c++) 784 printk(" %02x", *c); 785 printk("\n"); 786 #endif 787 788 switch (*ext++) { 789 case 1: /* Subnet mask */ 790 if (ic_netmask == INADDR_NONE) 791 memcpy(&ic_netmask, ext+1, 4); 792 break; 793 case 3: /* Default gateway */ 794 if (ic_gateway == INADDR_NONE) 795 memcpy(&ic_gateway, ext+1, 4); 796 break; 797 case 6: /* DNS server */ 798 servers= *ext/4; 799 if (servers > CONF_NAMESERVERS_MAX) 800 servers = CONF_NAMESERVERS_MAX; 801 for (i = 0; i < servers; i++) { 802 if (ic_nameservers[i] == INADDR_NONE) 803 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 804 } 805 break; 806 case 12: /* Host name */ 807 ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN); 808 ic_host_name_set = 1; 809 break; 810 case 15: /* Domain name (DNS) */ 811 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 812 break; 813 case 17: /* Root path */ 814 if (!root_server_path[0]) 815 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path)); 816 break; 817 case 40: /* NIS Domain name (_not_ DNS) */ 818 ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN); 819 break; 820 } 821 } 822 823 824 /* 825 * Receive BOOTP reply. 826 */ 827 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 828 { 829 struct bootp_pkt *b; 830 struct iphdr *h; 831 struct ic_device *d; 832 int len, ext_len; 833 834 /* Perform verifications before taking the lock. */ 835 if (skb->pkt_type == PACKET_OTHERHOST) 836 goto drop; 837 838 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 839 return NET_RX_DROP; 840 841 if (!pskb_may_pull(skb, 842 sizeof(struct iphdr) + 843 sizeof(struct udphdr))) 844 goto drop; 845 846 b = (struct bootp_pkt *) skb->nh.iph; 847 h = &b->iph; 848 849 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 850 goto drop; 851 852 /* Fragments are not supported */ 853 if (h->frag_off & htons(IP_OFFSET | IP_MF)) { 854 if (net_ratelimit()) 855 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " 856 "reply.\n"); 857 goto drop; 858 } 859 860 if (skb->len < ntohs(h->tot_len)) 861 goto drop; 862 863 if (ip_fast_csum((char *) h, h->ihl)) 864 goto drop; 865 866 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 867 goto drop; 868 869 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 870 goto drop; 871 872 len = ntohs(b->udph.len) - sizeof(struct udphdr); 873 ext_len = len - (sizeof(*b) - 874 sizeof(struct iphdr) - 875 sizeof(struct udphdr) - 876 sizeof(b->exten)); 877 if (ext_len < 0) 878 goto drop; 879 880 /* Ok the front looks good, make sure we can get at the rest. */ 881 if (!pskb_may_pull(skb, skb->len)) 882 goto drop; 883 884 b = (struct bootp_pkt *) skb->nh.iph; 885 h = &b->iph; 886 887 /* One reply at a time, please. */ 888 spin_lock(&ic_recv_lock); 889 890 /* If we already have a reply, just drop the packet */ 891 if (ic_got_reply) 892 goto drop_unlock; 893 894 /* Find the ic_device that the packet arrived on */ 895 d = ic_first_dev; 896 while (d && d->dev != dev) 897 d = d->next; 898 if (!d) 899 goto drop_unlock; /* should never happen */ 900 901 /* Is it a reply to our BOOTP request? */ 902 if (b->op != BOOTP_REPLY || 903 b->xid != d->xid) { 904 if (net_ratelimit()) 905 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " 906 "op[%x] xid[%x]\n", 907 b->op, b->xid); 908 goto drop_unlock; 909 } 910 911 /* Parse extensions */ 912 if (ext_len >= 4 && 913 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 914 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 915 u8 *ext; 916 917 #ifdef IPCONFIG_DHCP 918 if (ic_proto_enabled & IC_USE_DHCP) { 919 u32 server_id = INADDR_NONE; 920 int mt = 0; 921 922 ext = &b->exten[4]; 923 while (ext < end && *ext != 0xff) { 924 u8 *opt = ext++; 925 if (*opt == 0) /* Padding */ 926 continue; 927 ext += *ext + 1; 928 if (ext >= end) 929 break; 930 switch (*opt) { 931 case 53: /* Message type */ 932 if (opt[1]) 933 mt = opt[2]; 934 break; 935 case 54: /* Server ID (IP address) */ 936 if (opt[1] >= 4) 937 memcpy(&server_id, opt + 2, 4); 938 break; 939 }; 940 } 941 942 #ifdef IPCONFIG_DEBUG 943 printk("DHCP: Got message type %d\n", mt); 944 #endif 945 946 switch (mt) { 947 case DHCPOFFER: 948 /* While in the process of accepting one offer, 949 * ignore all others. 950 */ 951 if (ic_myaddr != INADDR_NONE) 952 goto drop_unlock; 953 954 /* Let's accept that offer. */ 955 ic_myaddr = b->your_ip; 956 ic_servaddr = server_id; 957 #ifdef IPCONFIG_DEBUG 958 printk("DHCP: Offered address %u.%u.%u.%u", 959 NIPQUAD(ic_myaddr)); 960 printk(" by server %u.%u.%u.%u\n", 961 NIPQUAD(ic_servaddr)); 962 #endif 963 /* The DHCP indicated server address takes 964 * precedence over the bootp header one if 965 * they are different. 966 */ 967 if ((server_id != INADDR_NONE) && 968 (b->server_ip != server_id)) 969 b->server_ip = ic_servaddr; 970 break; 971 972 case DHCPACK: 973 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 974 goto drop_unlock; 975 976 /* Yeah! */ 977 break; 978 979 default: 980 /* Urque. Forget it*/ 981 ic_myaddr = INADDR_NONE; 982 ic_servaddr = INADDR_NONE; 983 goto drop_unlock; 984 }; 985 986 ic_dhcp_msgtype = mt; 987 988 } 989 #endif /* IPCONFIG_DHCP */ 990 991 ext = &b->exten[4]; 992 while (ext < end && *ext != 0xff) { 993 u8 *opt = ext++; 994 if (*opt == 0) /* Padding */ 995 continue; 996 ext += *ext + 1; 997 if (ext < end) 998 ic_do_bootp_ext(opt); 999 } 1000 } 1001 1002 /* We have a winner! */ 1003 ic_dev = dev; 1004 ic_myaddr = b->your_ip; 1005 ic_servaddr = b->server_ip; 1006 if (ic_gateway == INADDR_NONE && b->relay_ip) 1007 ic_gateway = b->relay_ip; 1008 if (ic_nameservers[0] == INADDR_NONE) 1009 ic_nameservers[0] = ic_servaddr; 1010 ic_got_reply = IC_BOOTP; 1011 1012 drop_unlock: 1013 /* Show's over. Nothing to see here. */ 1014 spin_unlock(&ic_recv_lock); 1015 1016 drop: 1017 /* Throw the packet out. */ 1018 kfree_skb(skb); 1019 1020 return 0; 1021 } 1022 1023 1024 #endif 1025 1026 1027 /* 1028 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1029 */ 1030 1031 #ifdef IPCONFIG_DYNAMIC 1032 1033 static int __init ic_dynamic(void) 1034 { 1035 int retries; 1036 struct ic_device *d; 1037 unsigned long start_jiffies, timeout, jiff; 1038 int do_bootp = ic_proto_have_if & IC_BOOTP; 1039 int do_rarp = ic_proto_have_if & IC_RARP; 1040 1041 /* 1042 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1043 * This routine gets only called when some pieces of information 1044 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1045 */ 1046 if (!ic_proto_enabled) { 1047 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1048 return -1; 1049 } 1050 1051 #ifdef IPCONFIG_BOOTP 1052 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1053 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); 1054 #endif 1055 #ifdef IPCONFIG_RARP 1056 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1057 printk(KERN_ERR "RARP: No suitable device found.\n"); 1058 #endif 1059 1060 if (!ic_proto_have_if) 1061 /* Error message already printed */ 1062 return -1; 1063 1064 /* 1065 * Setup protocols 1066 */ 1067 #ifdef IPCONFIG_BOOTP 1068 if (do_bootp) 1069 ic_bootp_init(); 1070 #endif 1071 #ifdef IPCONFIG_RARP 1072 if (do_rarp) 1073 ic_rarp_init(); 1074 #endif 1075 1076 /* 1077 * Send requests and wait, until we get an answer. This loop 1078 * seems to be a terrible waste of CPU time, but actually there is 1079 * only one process running at all, so we don't need to use any 1080 * scheduler functions. 1081 * [Actually we could now, but the nothing else running note still 1082 * applies.. - AC] 1083 */ 1084 printk(KERN_NOTICE "Sending %s%s%s requests .", 1085 do_bootp 1086 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1087 (do_bootp && do_rarp) ? " and " : "", 1088 do_rarp ? "RARP" : ""); 1089 1090 start_jiffies = jiffies; 1091 d = ic_first_dev; 1092 retries = CONF_SEND_RETRIES; 1093 get_random_bytes(&timeout, sizeof(timeout)); 1094 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); 1095 for(;;) { 1096 #ifdef IPCONFIG_BOOTP 1097 if (do_bootp && (d->able & IC_BOOTP)) 1098 ic_bootp_send_if(d, jiffies - start_jiffies); 1099 #endif 1100 #ifdef IPCONFIG_RARP 1101 if (do_rarp && (d->able & IC_RARP)) 1102 ic_rarp_send_if(d); 1103 #endif 1104 1105 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1106 while (time_before(jiffies, jiff) && !ic_got_reply) { 1107 set_current_state(TASK_UNINTERRUPTIBLE); 1108 schedule_timeout(1); 1109 } 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