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 #define NONE __constant_htonl(INADDR_NONE) 105 106 /* 107 * Public IP configuration 108 */ 109 110 /* This is used by platforms which might be able to set the ipconfig 111 * variables using firmware environment vars. If this is set, it will 112 * ignore such firmware variables. 113 */ 114 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ 115 116 static int ic_enable __initdata = 0; /* IP config enabled? */ 117 118 /* Protocol choice */ 119 int ic_proto_enabled __initdata = 0 120 #ifdef IPCONFIG_BOOTP 121 | IC_BOOTP 122 #endif 123 #ifdef CONFIG_IP_PNP_DHCP 124 | IC_USE_DHCP 125 #endif 126 #ifdef IPCONFIG_RARP 127 | IC_RARP 128 #endif 129 ; 130 131 static int ic_host_name_set __initdata = 0; /* Host name set by us? */ 132 133 __be32 ic_myaddr = NONE; /* My IP address */ 134 static __be32 ic_netmask = NONE; /* Netmask for local subnet */ 135 __be32 ic_gateway = NONE; /* Gateway IP address */ 136 137 __be32 ic_servaddr = NONE; /* Boot server IP address */ 138 139 __be32 root_server_addr = NONE; /* Address of NFS server */ 140 u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 141 142 /* Persistent data: */ 143 144 static int ic_proto_used; /* Protocol used, if any */ 145 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 146 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 147 148 /* 149 * Private state. 150 */ 151 152 /* Name of user-selected boot device */ 153 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 154 155 /* Protocols supported by available interfaces */ 156 static int ic_proto_have_if __initdata = 0; 157 158 #ifdef IPCONFIG_DYNAMIC 159 static DEFINE_SPINLOCK(ic_recv_lock); 160 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */ 161 #endif 162 #ifdef IPCONFIG_DHCP 163 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */ 164 #endif 165 166 167 /* 168 * Network devices 169 */ 170 171 struct ic_device { 172 struct ic_device *next; 173 struct net_device *dev; 174 unsigned short flags; 175 short able; 176 __be32 xid; 177 }; 178 179 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */ 180 static struct net_device *ic_dev __initdata = NULL; /* Selected device */ 181 182 static int __init ic_open_devs(void) 183 { 184 struct ic_device *d, **last; 185 struct net_device *dev; 186 unsigned short oflags; 187 188 last = &ic_first_dev; 189 rtnl_lock(); 190 191 /* bring loopback device up first */ 192 if (dev_change_flags(&loopback_dev, loopback_dev.flags | IFF_UP) < 0) 193 printk(KERN_ERR "IP-Config: Failed to open %s\n", loopback_dev.name); 194 195 for_each_netdev(dev) { 196 if (dev == &loopback_dev) 197 continue; 198 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 199 (!(dev->flags & IFF_LOOPBACK) && 200 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 201 strncmp(dev->name, "dummy", 5))) { 202 int able = 0; 203 if (dev->mtu >= 364) 204 able |= IC_BOOTP; 205 else 206 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu); 207 if (!(dev->flags & IFF_NOARP)) 208 able |= IC_RARP; 209 able &= ic_proto_enabled; 210 if (ic_proto_enabled && !able) 211 continue; 212 oflags = dev->flags; 213 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 214 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); 215 continue; 216 } 217 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 218 rtnl_unlock(); 219 return -1; 220 } 221 d->dev = dev; 222 *last = d; 223 last = &d->next; 224 d->flags = oflags; 225 d->able = able; 226 if (able & IC_BOOTP) 227 get_random_bytes(&d->xid, sizeof(__be32)); 228 else 229 d->xid = 0; 230 ic_proto_have_if |= able; 231 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", 232 dev->name, able, d->xid)); 233 } 234 } 235 rtnl_unlock(); 236 237 *last = NULL; 238 239 if (!ic_first_dev) { 240 if (user_dev_name[0]) 241 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name); 242 else 243 printk(KERN_ERR "IP-Config: No network devices available.\n"); 244 return -1; 245 } 246 return 0; 247 } 248 249 static void __init ic_close_devs(void) 250 { 251 struct ic_device *d, *next; 252 struct net_device *dev; 253 254 rtnl_lock(); 255 next = ic_first_dev; 256 while ((d = next)) { 257 next = d->next; 258 dev = d->dev; 259 if (dev != ic_dev) { 260 DBG(("IP-Config: Downing %s\n", dev->name)); 261 dev_change_flags(dev, d->flags); 262 } 263 kfree(d); 264 } 265 rtnl_unlock(); 266 } 267 268 /* 269 * Interface to various network functions. 270 */ 271 272 static inline void 273 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 274 { 275 sin->sin_family = AF_INET; 276 sin->sin_addr.s_addr = addr; 277 sin->sin_port = port; 278 } 279 280 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 281 { 282 int res; 283 284 mm_segment_t oldfs = get_fs(); 285 set_fs(get_ds()); 286 res = devinet_ioctl(cmd, (struct ifreq __user *) arg); 287 set_fs(oldfs); 288 return res; 289 } 290 291 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 292 { 293 int res; 294 295 mm_segment_t oldfs = get_fs(); 296 set_fs(get_ds()); 297 res = ip_rt_ioctl(cmd, (void __user *) arg); 298 set_fs(oldfs); 299 return res; 300 } 301 302 /* 303 * Set up interface addresses and routes. 304 */ 305 306 static int __init ic_setup_if(void) 307 { 308 struct ifreq ir; 309 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 310 int err; 311 312 memset(&ir, 0, sizeof(ir)); 313 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); 314 set_sockaddr(sin, ic_myaddr, 0); 315 if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) { 316 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err); 317 return -1; 318 } 319 set_sockaddr(sin, ic_netmask, 0); 320 if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 321 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err); 322 return -1; 323 } 324 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 325 if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 326 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err); 327 return -1; 328 } 329 return 0; 330 } 331 332 static int __init ic_setup_routes(void) 333 { 334 /* No need to setup device routes, only the default route... */ 335 336 if (ic_gateway != NONE) { 337 struct rtentry rm; 338 int err; 339 340 memset(&rm, 0, sizeof(rm)); 341 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 342 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n"); 343 return -1; 344 } 345 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 346 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 347 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 348 rm.rt_flags = RTF_UP | RTF_GATEWAY; 349 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 350 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err); 351 return -1; 352 } 353 } 354 355 return 0; 356 } 357 358 /* 359 * Fill in default values for all missing parameters. 360 */ 361 362 static int __init ic_defaults(void) 363 { 364 /* 365 * At this point we have no userspace running so need not 366 * claim locks on system_utsname 367 */ 368 369 if (!ic_host_name_set) 370 sprintf(init_utsname()->nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr)); 371 372 if (root_server_addr == NONE) 373 root_server_addr = ic_servaddr; 374 375 if (ic_netmask == NONE) { 376 if (IN_CLASSA(ntohl(ic_myaddr))) 377 ic_netmask = htonl(IN_CLASSA_NET); 378 else if (IN_CLASSB(ntohl(ic_myaddr))) 379 ic_netmask = htonl(IN_CLASSB_NET); 380 else if (IN_CLASSC(ntohl(ic_myaddr))) 381 ic_netmask = htonl(IN_CLASSC_NET); 382 else { 383 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n", 384 NIPQUAD(ic_myaddr)); 385 return -1; 386 } 387 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask)); 388 } 389 390 return 0; 391 } 392 393 /* 394 * RARP support. 395 */ 396 397 #ifdef IPCONFIG_RARP 398 399 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 400 401 static struct packet_type rarp_packet_type __initdata = { 402 .type = __constant_htons(ETH_P_RARP), 403 .func = ic_rarp_recv, 404 }; 405 406 static inline void ic_rarp_init(void) 407 { 408 dev_add_pack(&rarp_packet_type); 409 } 410 411 static inline void ic_rarp_cleanup(void) 412 { 413 dev_remove_pack(&rarp_packet_type); 414 } 415 416 /* 417 * Process received RARP packet. 418 */ 419 static int __init 420 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 421 { 422 struct arphdr *rarp; 423 unsigned char *rarp_ptr; 424 __be32 sip, tip; 425 unsigned char *sha, *tha; /* s for "source", t for "target" */ 426 struct ic_device *d; 427 428 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 429 return NET_RX_DROP; 430 431 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 432 goto drop; 433 434 /* Basic sanity checks can be done without the lock. */ 435 rarp = (struct arphdr *)skb_transport_header(skb); 436 437 /* If this test doesn't pass, it's not IP, or we should 438 * ignore it anyway. 439 */ 440 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 441 goto drop; 442 443 /* If it's not a RARP reply, delete it. */ 444 if (rarp->ar_op != htons(ARPOP_RREPLY)) 445 goto drop; 446 447 /* If it's not Ethernet, delete it. */ 448 if (rarp->ar_pro != htons(ETH_P_IP)) 449 goto drop; 450 451 if (!pskb_may_pull(skb, 452 sizeof(struct arphdr) + 453 (2 * dev->addr_len) + 454 (2 * 4))) 455 goto drop; 456 457 /* OK, it is all there and looks valid, process... */ 458 rarp = (struct arphdr *)skb_transport_header(skb); 459 rarp_ptr = (unsigned char *) (rarp + 1); 460 461 /* One reply at a time, please. */ 462 spin_lock(&ic_recv_lock); 463 464 /* If we already have a reply, just drop the packet */ 465 if (ic_got_reply) 466 goto drop_unlock; 467 468 /* Find the ic_device that the packet arrived on */ 469 d = ic_first_dev; 470 while (d && d->dev != dev) 471 d = d->next; 472 if (!d) 473 goto drop_unlock; /* should never happen */ 474 475 /* Extract variable-width fields */ 476 sha = rarp_ptr; 477 rarp_ptr += dev->addr_len; 478 memcpy(&sip, rarp_ptr, 4); 479 rarp_ptr += 4; 480 tha = rarp_ptr; 481 rarp_ptr += dev->addr_len; 482 memcpy(&tip, rarp_ptr, 4); 483 484 /* Discard packets which are not meant for us. */ 485 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 486 goto drop_unlock; 487 488 /* Discard packets which are not from specified server. */ 489 if (ic_servaddr != NONE && ic_servaddr != sip) 490 goto drop_unlock; 491 492 /* We have a winner! */ 493 ic_dev = dev; 494 if (ic_myaddr == NONE) 495 ic_myaddr = tip; 496 ic_servaddr = sip; 497 ic_got_reply = IC_RARP; 498 499 drop_unlock: 500 /* Show's over. Nothing to see here. */ 501 spin_unlock(&ic_recv_lock); 502 503 drop: 504 /* Throw the packet out. */ 505 kfree_skb(skb); 506 return 0; 507 } 508 509 510 /* 511 * Send RARP request packet over a single interface. 512 */ 513 static void __init ic_rarp_send_if(struct ic_device *d) 514 { 515 struct net_device *dev = d->dev; 516 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 517 dev->dev_addr, dev->dev_addr); 518 } 519 #endif 520 521 /* 522 * DHCP/BOOTP support. 523 */ 524 525 #ifdef IPCONFIG_BOOTP 526 527 struct bootp_pkt { /* BOOTP packet format */ 528 struct iphdr iph; /* IP header */ 529 struct udphdr udph; /* UDP header */ 530 u8 op; /* 1=request, 2=reply */ 531 u8 htype; /* HW address type */ 532 u8 hlen; /* HW address length */ 533 u8 hops; /* Used only by gateways */ 534 __be32 xid; /* Transaction ID */ 535 __be16 secs; /* Seconds since we started */ 536 __be16 flags; /* Just what it says */ 537 __be32 client_ip; /* Client's IP address if known */ 538 __be32 your_ip; /* Assigned IP address */ 539 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 540 __be32 relay_ip; /* IP address of BOOTP relay */ 541 u8 hw_addr[16]; /* Client's HW address */ 542 u8 serv_name[64]; /* Server host name */ 543 u8 boot_file[128]; /* Name of boot file */ 544 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 545 }; 546 547 /* packet ops */ 548 #define BOOTP_REQUEST 1 549 #define BOOTP_REPLY 2 550 551 /* DHCP message types */ 552 #define DHCPDISCOVER 1 553 #define DHCPOFFER 2 554 #define DHCPREQUEST 3 555 #define DHCPDECLINE 4 556 #define DHCPACK 5 557 #define DHCPNAK 6 558 #define DHCPRELEASE 7 559 #define DHCPINFORM 8 560 561 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 562 563 static struct packet_type bootp_packet_type __initdata = { 564 .type = __constant_htons(ETH_P_IP), 565 .func = ic_bootp_recv, 566 }; 567 568 569 /* 570 * Initialize DHCP/BOOTP extension fields in the request. 571 */ 572 573 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 574 575 #ifdef IPCONFIG_DHCP 576 577 static void __init 578 ic_dhcp_init_options(u8 *options) 579 { 580 u8 mt = ((ic_servaddr == NONE) 581 ? DHCPDISCOVER : DHCPREQUEST); 582 u8 *e = options; 583 584 #ifdef IPCONFIG_DEBUG 585 printk("DHCP: Sending message type %d\n", mt); 586 #endif 587 588 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 589 e += 4; 590 591 *e++ = 53; /* DHCP message type */ 592 *e++ = 1; 593 *e++ = mt; 594 595 if (mt == DHCPREQUEST) { 596 *e++ = 54; /* Server ID (IP address) */ 597 *e++ = 4; 598 memcpy(e, &ic_servaddr, 4); 599 e += 4; 600 601 *e++ = 50; /* Requested IP address */ 602 *e++ = 4; 603 memcpy(e, &ic_myaddr, 4); 604 e += 4; 605 } 606 607 /* always? */ 608 { 609 static const u8 ic_req_params[] = { 610 1, /* Subnet mask */ 611 3, /* Default gateway */ 612 6, /* DNS server */ 613 12, /* Host name */ 614 15, /* Domain name */ 615 17, /* Boot path */ 616 40, /* NIS domain name */ 617 }; 618 619 *e++ = 55; /* Parameter request list */ 620 *e++ = sizeof(ic_req_params); 621 memcpy(e, ic_req_params, sizeof(ic_req_params)); 622 e += sizeof(ic_req_params); 623 } 624 625 *e++ = 255; /* End of the list */ 626 } 627 628 #endif /* IPCONFIG_DHCP */ 629 630 static void __init ic_bootp_init_ext(u8 *e) 631 { 632 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 633 e += 4; 634 *e++ = 1; /* Subnet mask request */ 635 *e++ = 4; 636 e += 4; 637 *e++ = 3; /* Default gateway request */ 638 *e++ = 4; 639 e += 4; 640 *e++ = 5; /* Name server request */ 641 *e++ = 8; 642 e += 8; 643 *e++ = 12; /* Host name request */ 644 *e++ = 32; 645 e += 32; 646 *e++ = 40; /* NIS Domain name request */ 647 *e++ = 32; 648 e += 32; 649 *e++ = 17; /* Boot path */ 650 *e++ = 40; 651 e += 40; 652 653 *e++ = 57; /* set extension buffer size for reply */ 654 *e++ = 2; 655 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 656 *e++ = 150; 657 658 *e++ = 255; /* End of the list */ 659 } 660 661 662 /* 663 * Initialize the DHCP/BOOTP mechanism. 664 */ 665 static inline void ic_bootp_init(void) 666 { 667 int i; 668 669 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 670 ic_nameservers[i] = NONE; 671 672 dev_add_pack(&bootp_packet_type); 673 } 674 675 676 /* 677 * DHCP/BOOTP cleanup. 678 */ 679 static inline void ic_bootp_cleanup(void) 680 { 681 dev_remove_pack(&bootp_packet_type); 682 } 683 684 685 /* 686 * Send DHCP/BOOTP request to single interface. 687 */ 688 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 689 { 690 struct net_device *dev = d->dev; 691 struct sk_buff *skb; 692 struct bootp_pkt *b; 693 int hh_len = LL_RESERVED_SPACE(dev); 694 struct iphdr *h; 695 696 /* Allocate packet */ 697 skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL); 698 if (!skb) 699 return; 700 skb_reserve(skb, hh_len); 701 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 702 memset(b, 0, sizeof(struct bootp_pkt)); 703 704 /* Construct IP header */ 705 skb_reset_network_header(skb); 706 h = ip_hdr(skb); 707 h->version = 4; 708 h->ihl = 5; 709 h->tot_len = htons(sizeof(struct bootp_pkt)); 710 h->frag_off = htons(IP_DF); 711 h->ttl = 64; 712 h->protocol = IPPROTO_UDP; 713 h->daddr = htonl(INADDR_BROADCAST); 714 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 715 716 /* Construct UDP header */ 717 b->udph.source = htons(68); 718 b->udph.dest = htons(67); 719 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 720 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 721 722 /* Construct DHCP/BOOTP header */ 723 b->op = BOOTP_REQUEST; 724 if (dev->type < 256) /* check for false types */ 725 b->htype = dev->type; 726 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ 727 b->htype = ARPHRD_IEEE802; 728 else if (dev->type == ARPHRD_FDDI) 729 b->htype = ARPHRD_ETHER; 730 else { 731 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 732 b->htype = dev->type; /* can cause undefined behavior */ 733 } 734 b->hlen = dev->addr_len; 735 b->your_ip = NONE; 736 b->server_ip = NONE; 737 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 738 b->secs = htons(jiffies_diff / HZ); 739 b->xid = d->xid; 740 741 /* add DHCP options or BOOTP extensions */ 742 #ifdef IPCONFIG_DHCP 743 if (ic_proto_enabled & IC_USE_DHCP) 744 ic_dhcp_init_options(b->exten); 745 else 746 #endif 747 ic_bootp_init_ext(b->exten); 748 749 /* Chain packet down the line... */ 750 skb->dev = dev; 751 skb->protocol = htons(ETH_P_IP); 752 if ((dev->hard_header && 753 dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) || 754 dev_queue_xmit(skb) < 0) 755 printk("E"); 756 } 757 758 759 /* 760 * Copy BOOTP-supplied string if not already set. 761 */ 762 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 763 { 764 if (!len) 765 return 0; 766 if (len > max-1) 767 len = max-1; 768 memcpy(dest, src, len); 769 dest[len] = '\0'; 770 return 1; 771 } 772 773 774 /* 775 * Process BOOTP extensions. 776 */ 777 static void __init ic_do_bootp_ext(u8 *ext) 778 { 779 u8 servers; 780 int i; 781 782 #ifdef IPCONFIG_DEBUG 783 u8 *c; 784 785 printk("DHCP/BOOTP: Got extension %d:",*ext); 786 for (c=ext+2; c<ext+2+ext[1]; c++) 787 printk(" %02x", *c); 788 printk("\n"); 789 #endif 790 791 switch (*ext++) { 792 case 1: /* Subnet mask */ 793 if (ic_netmask == NONE) 794 memcpy(&ic_netmask, ext+1, 4); 795 break; 796 case 3: /* Default gateway */ 797 if (ic_gateway == NONE) 798 memcpy(&ic_gateway, ext+1, 4); 799 break; 800 case 6: /* DNS server */ 801 servers= *ext/4; 802 if (servers > CONF_NAMESERVERS_MAX) 803 servers = CONF_NAMESERVERS_MAX; 804 for (i = 0; i < servers; i++) { 805 if (ic_nameservers[i] == NONE) 806 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 807 } 808 break; 809 case 12: /* Host name */ 810 ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN); 811 ic_host_name_set = 1; 812 break; 813 case 15: /* Domain name (DNS) */ 814 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 815 break; 816 case 17: /* Root path */ 817 if (!root_server_path[0]) 818 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path)); 819 break; 820 case 40: /* NIS Domain name (_not_ DNS) */ 821 ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN); 822 break; 823 } 824 } 825 826 827 /* 828 * Receive BOOTP reply. 829 */ 830 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 831 { 832 struct bootp_pkt *b; 833 struct iphdr *h; 834 struct ic_device *d; 835 int len, ext_len; 836 837 /* Perform verifications before taking the lock. */ 838 if (skb->pkt_type == PACKET_OTHERHOST) 839 goto drop; 840 841 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 842 return NET_RX_DROP; 843 844 if (!pskb_may_pull(skb, 845 sizeof(struct iphdr) + 846 sizeof(struct udphdr))) 847 goto drop; 848 849 b = (struct bootp_pkt *)skb_network_header(skb); 850 h = &b->iph; 851 852 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 853 goto drop; 854 855 /* Fragments are not supported */ 856 if (h->frag_off & htons(IP_OFFSET | IP_MF)) { 857 if (net_ratelimit()) 858 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " 859 "reply.\n"); 860 goto drop; 861 } 862 863 if (skb->len < ntohs(h->tot_len)) 864 goto drop; 865 866 if (ip_fast_csum((char *) h, h->ihl)) 867 goto drop; 868 869 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 870 goto drop; 871 872 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 873 goto drop; 874 875 len = ntohs(b->udph.len) - sizeof(struct udphdr); 876 ext_len = len - (sizeof(*b) - 877 sizeof(struct iphdr) - 878 sizeof(struct udphdr) - 879 sizeof(b->exten)); 880 if (ext_len < 0) 881 goto drop; 882 883 /* Ok the front looks good, make sure we can get at the rest. */ 884 if (!pskb_may_pull(skb, skb->len)) 885 goto drop; 886 887 b = (struct bootp_pkt *)skb_network_header(skb); 888 h = &b->iph; 889 890 /* One reply at a time, please. */ 891 spin_lock(&ic_recv_lock); 892 893 /* If we already have a reply, just drop the packet */ 894 if (ic_got_reply) 895 goto drop_unlock; 896 897 /* Find the ic_device that the packet arrived on */ 898 d = ic_first_dev; 899 while (d && d->dev != dev) 900 d = d->next; 901 if (!d) 902 goto drop_unlock; /* should never happen */ 903 904 /* Is it a reply to our BOOTP request? */ 905 if (b->op != BOOTP_REPLY || 906 b->xid != d->xid) { 907 if (net_ratelimit()) 908 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " 909 "op[%x] xid[%x]\n", 910 b->op, b->xid); 911 goto drop_unlock; 912 } 913 914 /* Parse extensions */ 915 if (ext_len >= 4 && 916 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 917 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 918 u8 *ext; 919 920 #ifdef IPCONFIG_DHCP 921 if (ic_proto_enabled & IC_USE_DHCP) { 922 __be32 server_id = NONE; 923 int mt = 0; 924 925 ext = &b->exten[4]; 926 while (ext < end && *ext != 0xff) { 927 u8 *opt = ext++; 928 if (*opt == 0) /* Padding */ 929 continue; 930 ext += *ext + 1; 931 if (ext >= end) 932 break; 933 switch (*opt) { 934 case 53: /* Message type */ 935 if (opt[1]) 936 mt = opt[2]; 937 break; 938 case 54: /* Server ID (IP address) */ 939 if (opt[1] >= 4) 940 memcpy(&server_id, opt + 2, 4); 941 break; 942 } 943 } 944 945 #ifdef IPCONFIG_DEBUG 946 printk("DHCP: Got message type %d\n", mt); 947 #endif 948 949 switch (mt) { 950 case DHCPOFFER: 951 /* While in the process of accepting one offer, 952 * ignore all others. 953 */ 954 if (ic_myaddr != NONE) 955 goto drop_unlock; 956 957 /* Let's accept that offer. */ 958 ic_myaddr = b->your_ip; 959 ic_servaddr = server_id; 960 #ifdef IPCONFIG_DEBUG 961 printk("DHCP: Offered address %u.%u.%u.%u", 962 NIPQUAD(ic_myaddr)); 963 printk(" by server %u.%u.%u.%u\n", 964 NIPQUAD(ic_servaddr)); 965 #endif 966 /* The DHCP indicated server address takes 967 * precedence over the bootp header one if 968 * they are different. 969 */ 970 if ((server_id != NONE) && 971 (b->server_ip != server_id)) 972 b->server_ip = ic_servaddr; 973 break; 974 975 case DHCPACK: 976 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 977 goto drop_unlock; 978 979 /* Yeah! */ 980 break; 981 982 default: 983 /* Urque. Forget it*/ 984 ic_myaddr = NONE; 985 ic_servaddr = NONE; 986 goto drop_unlock; 987 } 988 989 ic_dhcp_msgtype = mt; 990 991 } 992 #endif /* IPCONFIG_DHCP */ 993 994 ext = &b->exten[4]; 995 while (ext < end && *ext != 0xff) { 996 u8 *opt = ext++; 997 if (*opt == 0) /* Padding */ 998 continue; 999 ext += *ext + 1; 1000 if (ext < end) 1001 ic_do_bootp_ext(opt); 1002 } 1003 } 1004 1005 /* We have a winner! */ 1006 ic_dev = dev; 1007 ic_myaddr = b->your_ip; 1008 ic_servaddr = b->server_ip; 1009 if (ic_gateway == NONE && b->relay_ip) 1010 ic_gateway = b->relay_ip; 1011 if (ic_nameservers[0] == NONE) 1012 ic_nameservers[0] = ic_servaddr; 1013 ic_got_reply = IC_BOOTP; 1014 1015 drop_unlock: 1016 /* Show's over. Nothing to see here. */ 1017 spin_unlock(&ic_recv_lock); 1018 1019 drop: 1020 /* Throw the packet out. */ 1021 kfree_skb(skb); 1022 1023 return 0; 1024 } 1025 1026 1027 #endif 1028 1029 1030 /* 1031 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1032 */ 1033 1034 #ifdef IPCONFIG_DYNAMIC 1035 1036 static int __init ic_dynamic(void) 1037 { 1038 int retries; 1039 struct ic_device *d; 1040 unsigned long start_jiffies, timeout, jiff; 1041 int do_bootp = ic_proto_have_if & IC_BOOTP; 1042 int do_rarp = ic_proto_have_if & IC_RARP; 1043 1044 /* 1045 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1046 * This routine gets only called when some pieces of information 1047 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1048 */ 1049 if (!ic_proto_enabled) { 1050 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1051 return -1; 1052 } 1053 1054 #ifdef IPCONFIG_BOOTP 1055 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1056 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); 1057 #endif 1058 #ifdef IPCONFIG_RARP 1059 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1060 printk(KERN_ERR "RARP: No suitable device found.\n"); 1061 #endif 1062 1063 if (!ic_proto_have_if) 1064 /* Error message already printed */ 1065 return -1; 1066 1067 /* 1068 * Setup protocols 1069 */ 1070 #ifdef IPCONFIG_BOOTP 1071 if (do_bootp) 1072 ic_bootp_init(); 1073 #endif 1074 #ifdef IPCONFIG_RARP 1075 if (do_rarp) 1076 ic_rarp_init(); 1077 #endif 1078 1079 /* 1080 * Send requests and wait, until we get an answer. This loop 1081 * seems to be a terrible waste of CPU time, but actually there is 1082 * only one process running at all, so we don't need to use any 1083 * scheduler functions. 1084 * [Actually we could now, but the nothing else running note still 1085 * applies.. - AC] 1086 */ 1087 printk(KERN_NOTICE "Sending %s%s%s requests .", 1088 do_bootp 1089 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1090 (do_bootp && do_rarp) ? " and " : "", 1091 do_rarp ? "RARP" : ""); 1092 1093 start_jiffies = jiffies; 1094 d = ic_first_dev; 1095 retries = CONF_SEND_RETRIES; 1096 get_random_bytes(&timeout, sizeof(timeout)); 1097 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); 1098 for (;;) { 1099 #ifdef IPCONFIG_BOOTP 1100 if (do_bootp && (d->able & IC_BOOTP)) 1101 ic_bootp_send_if(d, jiffies - start_jiffies); 1102 #endif 1103 #ifdef IPCONFIG_RARP 1104 if (do_rarp && (d->able & IC_RARP)) 1105 ic_rarp_send_if(d); 1106 #endif 1107 1108 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1109 while (time_before(jiffies, jiff) && !ic_got_reply) 1110 schedule_timeout_uninterruptible(1); 1111 #ifdef IPCONFIG_DHCP 1112 /* DHCP isn't done until we get a DHCPACK. */ 1113 if ((ic_got_reply & IC_BOOTP) 1114 && (ic_proto_enabled & IC_USE_DHCP) 1115 && ic_dhcp_msgtype != DHCPACK) 1116 { 1117 ic_got_reply = 0; 1118 printk(","); 1119 continue; 1120 } 1121 #endif /* IPCONFIG_DHCP */ 1122 1123 if (ic_got_reply) { 1124 printk(" OK\n"); 1125 break; 1126 } 1127 1128 if ((d = d->next)) 1129 continue; 1130 1131 if (! --retries) { 1132 printk(" timed out!\n"); 1133 break; 1134 } 1135 1136 d = ic_first_dev; 1137 1138 timeout = timeout CONF_TIMEOUT_MULT; 1139 if (timeout > CONF_TIMEOUT_MAX) 1140 timeout = CONF_TIMEOUT_MAX; 1141 1142 printk("."); 1143 } 1144 1145 #ifdef IPCONFIG_BOOTP 1146 if (do_bootp) 1147 ic_bootp_cleanup(); 1148 #endif 1149 #ifdef IPCONFIG_RARP 1150 if (do_rarp) 1151 ic_rarp_cleanup(); 1152 #endif 1153 1154 if (!ic_got_reply) { 1155 ic_myaddr = NONE; 1156 return -1; 1157 } 1158 1159 printk("IP-Config: Got %s answer from %u.%u.%u.%u, ", 1160 ((ic_got_reply & IC_RARP) ? "RARP" 1161 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1162 NIPQUAD(ic_servaddr)); 1163 printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr)); 1164 1165 return 0; 1166 } 1167 1168 #endif /* IPCONFIG_DYNAMIC */ 1169 1170 #ifdef CONFIG_PROC_FS 1171 1172 static int pnp_seq_show(struct seq_file *seq, void *v) 1173 { 1174 int i; 1175 1176 if (ic_proto_used & IC_PROTO) 1177 seq_printf(seq, "#PROTO: %s\n", 1178 (ic_proto_used & IC_RARP) ? "RARP" 1179 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1180 else 1181 seq_puts(seq, "#MANUAL\n"); 1182 1183 if (ic_domain[0]) 1184 seq_printf(seq, 1185 "domain %s\n", ic_domain); 1186 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1187 if (ic_nameservers[i] != NONE) 1188 seq_printf(seq, 1189 "nameserver %u.%u.%u.%u\n", 1190 NIPQUAD(ic_nameservers[i])); 1191 } 1192 if (ic_servaddr != NONE) 1193 seq_printf(seq, 1194 "bootserver %u.%u.%u.%u\n", 1195 NIPQUAD(ic_servaddr)); 1196 return 0; 1197 } 1198 1199 static int pnp_seq_open(struct inode *indoe, struct file *file) 1200 { 1201 return single_open(file, pnp_seq_show, NULL); 1202 } 1203 1204 static const struct file_operations pnp_seq_fops = { 1205 .owner = THIS_MODULE, 1206 .open = pnp_seq_open, 1207 .read = seq_read, 1208 .llseek = seq_lseek, 1209 .release = single_release, 1210 }; 1211 #endif /* CONFIG_PROC_FS */ 1212 1213 /* 1214 * Extract IP address from the parameter string if needed. Note that we 1215 * need to have root_server_addr set _before_ IPConfig gets called as it 1216 * can override it. 1217 */ 1218 __be32 __init root_nfs_parse_addr(char *name) 1219 { 1220 __be32 addr; 1221 int octets = 0; 1222 char *cp, *cq; 1223 1224 cp = cq = name; 1225 while (octets < 4) { 1226 while (*cp >= '0' && *cp <= '9') 1227 cp++; 1228 if (cp == cq || cp - cq > 3) 1229 break; 1230 if (*cp == '.' || octets == 3) 1231 octets++; 1232 if (octets < 4) 1233 cp++; 1234 cq = cp; 1235 } 1236 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1237 if (*cp == ':') 1238 *cp++ = '\0'; 1239 addr = in_aton(name); 1240 memmove(name, cp, strlen(cp) + 1); 1241 } else 1242 addr = NONE; 1243 1244 return addr; 1245 } 1246 1247 /* 1248 * IP Autoconfig dispatcher. 1249 */ 1250 1251 static int __init ip_auto_config(void) 1252 { 1253 __be32 addr; 1254 1255 #ifdef CONFIG_PROC_FS 1256 proc_net_fops_create("pnp", S_IRUGO, &pnp_seq_fops); 1257 #endif /* CONFIG_PROC_FS */ 1258 1259 if (!ic_enable) 1260 return 0; 1261 1262 DBG(("IP-Config: Entered.\n")); 1263 #ifdef IPCONFIG_DYNAMIC 1264 try_try_again: 1265 #endif 1266 /* Give hardware a chance to settle */ 1267 msleep(CONF_PRE_OPEN); 1268 1269 /* Setup all network devices */ 1270 if (ic_open_devs() < 0) 1271 return -1; 1272 1273 /* Give drivers a chance to settle */ 1274 ssleep(CONF_POST_OPEN); 1275 1276 /* 1277 * If the config information is insufficient (e.g., our IP address or 1278 * IP address of the boot server is missing or we have multiple network 1279 * interfaces and no default was set), use BOOTP or RARP to get the 1280 * missing values. 1281 */ 1282 if (ic_myaddr == NONE || 1283 #ifdef CONFIG_ROOT_NFS 1284 (MAJOR(ROOT_DEV) == UNNAMED_MAJOR 1285 && root_server_addr == NONE 1286 && ic_servaddr == NONE) || 1287 #endif 1288 ic_first_dev->next) { 1289 #ifdef IPCONFIG_DYNAMIC 1290 1291 int retries = CONF_OPEN_RETRIES; 1292 1293 if (ic_dynamic() < 0) { 1294 ic_close_devs(); 1295 1296 /* 1297 * I don't know why, but sometimes the 1298 * eepro100 driver (at least) gets upset and 1299 * doesn't work the first time it's opened. 1300 * But then if you close it and reopen it, it 1301 * works just fine. So we need to try that at 1302 * least once before giving up. 1303 * 1304 * Also, if the root will be NFS-mounted, we 1305 * have nowhere to go if DHCP fails. So we 1306 * just have to keep trying forever. 1307 * 1308 * -- Chip 1309 */ 1310 #ifdef CONFIG_ROOT_NFS 1311 if (ROOT_DEV == Root_NFS) { 1312 printk(KERN_ERR 1313 "IP-Config: Retrying forever (NFS root)...\n"); 1314 goto try_try_again; 1315 } 1316 #endif 1317 1318 if (--retries) { 1319 printk(KERN_ERR 1320 "IP-Config: Reopening network devices...\n"); 1321 goto try_try_again; 1322 } 1323 1324 /* Oh, well. At least we tried. */ 1325 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); 1326 return -1; 1327 } 1328 #else /* !DYNAMIC */ 1329 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1330 ic_close_devs(); 1331 return -1; 1332 #endif /* IPCONFIG_DYNAMIC */ 1333 } else { 1334 /* Device selected manually or only one device -> use it */ 1335 ic_dev = ic_first_dev->dev; 1336 } 1337 1338 addr = root_nfs_parse_addr(root_server_path); 1339 if (root_server_addr == NONE) 1340 root_server_addr = addr; 1341 1342 /* 1343 * Use defaults whereever applicable. 1344 */ 1345 if (ic_defaults() < 0) 1346 return -1; 1347 1348 /* 1349 * Close all network devices except the device we've 1350 * autoconfigured and set up routes. 1351 */ 1352 ic_close_devs(); 1353 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1354 return -1; 1355 1356 /* 1357 * Record which protocol was actually used. 1358 */ 1359 #ifdef IPCONFIG_DYNAMIC 1360 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1361 #endif 1362 1363 #ifndef IPCONFIG_SILENT 1364 /* 1365 * Clue in the operator. 1366 */ 1367 printk("IP-Config: Complete:"); 1368 printk("\n device=%s", ic_dev->name); 1369 printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr)); 1370 printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask)); 1371 printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway)); 1372 printk(",\n host=%s, domain=%s, nis-domain=%s", 1373 utsname()->nodename, ic_domain, utsname()->domainname); 1374 printk(",\n bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr)); 1375 printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr)); 1376 printk(", rootpath=%s", root_server_path); 1377 printk("\n"); 1378 #endif /* !SILENT */ 1379 1380 return 0; 1381 } 1382 1383 late_initcall(ip_auto_config); 1384 1385 1386 /* 1387 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1388 * command line parameter. It consists of option fields separated by colons in 1389 * the following order: 1390 * 1391 * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO> 1392 * 1393 * Any of the fields can be empty which means to use a default value: 1394 * <client-ip> - address given by BOOTP or RARP 1395 * <server-ip> - address of host returning BOOTP or RARP packet 1396 * <gw-ip> - none, or the address returned by BOOTP 1397 * <netmask> - automatically determined from <client-ip>, or the 1398 * one returned by BOOTP 1399 * <host name> - <client-ip> in ASCII notation, or the name returned 1400 * by BOOTP 1401 * <device> - use all available devices 1402 * <PROTO>: 1403 * off|none - don't do autoconfig at all (DEFAULT) 1404 * on|any - use any configured protocol 1405 * dhcp|bootp|rarp - use only the specified protocol 1406 * both - use both BOOTP and RARP (not DHCP) 1407 */ 1408 static int __init ic_proto_name(char *name) 1409 { 1410 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1411 return 1; 1412 } 1413 #ifdef CONFIG_IP_PNP_DHCP 1414 else if (!strcmp(name, "dhcp")) { 1415 ic_proto_enabled &= ~IC_RARP; 1416 return 1; 1417 } 1418 #endif 1419 #ifdef CONFIG_IP_PNP_BOOTP 1420 else if (!strcmp(name, "bootp")) { 1421 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1422 return 1; 1423 } 1424 #endif 1425 #ifdef CONFIG_IP_PNP_RARP 1426 else if (!strcmp(name, "rarp")) { 1427 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1428 return 1; 1429 } 1430 #endif 1431 #ifdef IPCONFIG_DYNAMIC 1432 else if (!strcmp(name, "both")) { 1433 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1434 return 1; 1435 } 1436 #endif 1437 return 0; 1438 } 1439 1440 static int __init ip_auto_config_setup(char *addrs) 1441 { 1442 char *cp, *ip, *dp; 1443 int num = 0; 1444 1445 ic_set_manually = 1; 1446 1447 ic_enable = (*addrs && 1448 (strcmp(addrs, "off") != 0) && 1449 (strcmp(addrs, "none") != 0)); 1450 if (!ic_enable) 1451 return 1; 1452 1453 if (ic_proto_name(addrs)) 1454 return 1; 1455 1456 /* Parse the whole string */ 1457 ip = addrs; 1458 while (ip && *ip) { 1459 if ((cp = strchr(ip, ':'))) 1460 *cp++ = '\0'; 1461 if (strlen(ip) > 0) { 1462 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); 1463 switch (num) { 1464 case 0: 1465 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY) 1466 ic_myaddr = NONE; 1467 break; 1468 case 1: 1469 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY) 1470 ic_servaddr = NONE; 1471 break; 1472 case 2: 1473 if ((ic_gateway = in_aton(ip)) == INADDR_ANY) 1474 ic_gateway = NONE; 1475 break; 1476 case 3: 1477 if ((ic_netmask = in_aton(ip)) == INADDR_ANY) 1478 ic_netmask = NONE; 1479 break; 1480 case 4: 1481 if ((dp = strchr(ip, '.'))) { 1482 *dp++ = '\0'; 1483 strlcpy(utsname()->domainname, dp, 1484 sizeof(utsname()->domainname)); 1485 } 1486 strlcpy(utsname()->nodename, ip, 1487 sizeof(utsname()->nodename)); 1488 ic_host_name_set = 1; 1489 break; 1490 case 5: 1491 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1492 break; 1493 case 6: 1494 ic_proto_name(ip); 1495 break; 1496 } 1497 } 1498 ip = cp; 1499 num++; 1500 } 1501 1502 return 1; 1503 } 1504 1505 static int __init nfsaddrs_config_setup(char *addrs) 1506 { 1507 return ip_auto_config_setup(addrs); 1508 } 1509 1510 __setup("ip=", ip_auto_config_setup); 1511 __setup("nfsaddrs=", nfsaddrs_config_setup); 1512