1 /* 2 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or 3 * user-supplied information to configure own IP address and routes. 4 * 5 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz> 6 * 7 * Derived from network configuration code in fs/nfs/nfsroot.c, 8 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me. 9 * 10 * BOOTP rewritten to construct and analyse packets itself instead 11 * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--; 12 * -- MJ, December 1998 13 * 14 * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic" 15 * initialization scheme. 16 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999 17 * 18 * DHCP support added. To users this looks like a whole separate 19 * protocol, but we know it's just a bag on the side of BOOTP. 20 * -- Chip Salzenberg <chip@valinux.com>, May 2000 21 * 22 * Ported DHCP support from 2.2.16 to 2.4.0-test4 23 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000 24 * 25 * Merged changes from 2.2.19 into 2.4.3 26 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001 27 * 28 * Multiple Nameservers in /proc/net/pnp 29 * -- Josef Siemes <jsiemes@web.de>, Aug 2002 30 */ 31 32 #include <linux/types.h> 33 #include <linux/string.h> 34 #include <linux/kernel.h> 35 #include <linux/jiffies.h> 36 #include <linux/random.h> 37 #include <linux/init.h> 38 #include <linux/utsname.h> 39 #include <linux/in.h> 40 #include <linux/if.h> 41 #include <linux/inet.h> 42 #include <linux/inetdevice.h> 43 #include <linux/netdevice.h> 44 #include <linux/if_arp.h> 45 #include <linux/skbuff.h> 46 #include <linux/ip.h> 47 #include <linux/socket.h> 48 #include <linux/route.h> 49 #include <linux/udp.h> 50 #include <linux/proc_fs.h> 51 #include <linux/seq_file.h> 52 #include <linux/major.h> 53 #include <linux/root_dev.h> 54 #include <linux/delay.h> 55 #include <linux/nfs_fs.h> 56 #include <net/net_namespace.h> 57 #include <net/arp.h> 58 #include <net/ip.h> 59 #include <net/ipconfig.h> 60 #include <net/route.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 #define NONE cpu_to_be32(INADDR_NONE) 104 #define ANY cpu_to_be32(INADDR_ANY) 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 u32 ic_dev_xid; /* Device under configuration */ 143 144 /* vendor class identifier */ 145 static char vendor_class_identifier[253] __initdata; 146 147 /* Persistent data: */ 148 149 static int ic_proto_used; /* Protocol used, if any */ 150 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 151 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 152 153 /* 154 * Private state. 155 */ 156 157 /* Name of user-selected boot device */ 158 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 159 160 /* Protocols supported by available interfaces */ 161 static int ic_proto_have_if __initdata = 0; 162 163 #ifdef IPCONFIG_DYNAMIC 164 static DEFINE_SPINLOCK(ic_recv_lock); 165 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */ 166 #endif 167 #ifdef IPCONFIG_DHCP 168 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */ 169 #endif 170 171 172 /* 173 * Network devices 174 */ 175 176 struct ic_device { 177 struct ic_device *next; 178 struct net_device *dev; 179 unsigned short flags; 180 short able; 181 __be32 xid; 182 }; 183 184 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */ 185 static struct net_device *ic_dev __initdata = NULL; /* Selected device */ 186 187 static int __init ic_open_devs(void) 188 { 189 struct ic_device *d, **last; 190 struct net_device *dev; 191 unsigned short oflags; 192 193 last = &ic_first_dev; 194 rtnl_lock(); 195 196 /* bring loopback device up first */ 197 for_each_netdev(&init_net, dev) { 198 if (!(dev->flags & IFF_LOOPBACK)) 199 continue; 200 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) 201 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); 202 } 203 204 for_each_netdev(&init_net, dev) { 205 if (dev->flags & IFF_LOOPBACK) 206 continue; 207 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 208 (!(dev->flags & IFF_LOOPBACK) && 209 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 210 strncmp(dev->name, "dummy", 5))) { 211 int able = 0; 212 if (dev->mtu >= 364) 213 able |= IC_BOOTP; 214 else 215 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu); 216 if (!(dev->flags & IFF_NOARP)) 217 able |= IC_RARP; 218 able &= ic_proto_enabled; 219 if (ic_proto_enabled && !able) 220 continue; 221 oflags = dev->flags; 222 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 223 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); 224 continue; 225 } 226 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 227 rtnl_unlock(); 228 return -1; 229 } 230 d->dev = dev; 231 *last = d; 232 last = &d->next; 233 d->flags = oflags; 234 d->able = able; 235 if (able & IC_BOOTP) 236 get_random_bytes(&d->xid, sizeof(__be32)); 237 else 238 d->xid = 0; 239 ic_proto_have_if |= able; 240 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", 241 dev->name, able, d->xid)); 242 } 243 } 244 rtnl_unlock(); 245 246 *last = NULL; 247 248 if (!ic_first_dev) { 249 if (user_dev_name[0]) 250 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name); 251 else 252 printk(KERN_ERR "IP-Config: No network devices available.\n"); 253 return -1; 254 } 255 return 0; 256 } 257 258 static void __init ic_close_devs(void) 259 { 260 struct ic_device *d, *next; 261 struct net_device *dev; 262 263 rtnl_lock(); 264 next = ic_first_dev; 265 while ((d = next)) { 266 next = d->next; 267 dev = d->dev; 268 if (dev != ic_dev) { 269 DBG(("IP-Config: Downing %s\n", dev->name)); 270 dev_change_flags(dev, d->flags); 271 } 272 kfree(d); 273 } 274 rtnl_unlock(); 275 } 276 277 /* 278 * Interface to various network functions. 279 */ 280 281 static inline void 282 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 283 { 284 sin->sin_family = AF_INET; 285 sin->sin_addr.s_addr = addr; 286 sin->sin_port = port; 287 } 288 289 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 290 { 291 int res; 292 293 mm_segment_t oldfs = get_fs(); 294 set_fs(get_ds()); 295 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 296 set_fs(oldfs); 297 return res; 298 } 299 300 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 301 { 302 int res; 303 304 mm_segment_t oldfs = get_fs(); 305 set_fs(get_ds()); 306 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); 307 set_fs(oldfs); 308 return res; 309 } 310 311 /* 312 * Set up interface addresses and routes. 313 */ 314 315 static int __init ic_setup_if(void) 316 { 317 struct ifreq ir; 318 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 319 int err; 320 321 memset(&ir, 0, sizeof(ir)); 322 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); 323 set_sockaddr(sin, ic_myaddr, 0); 324 if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) { 325 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err); 326 return -1; 327 } 328 set_sockaddr(sin, ic_netmask, 0); 329 if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 330 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err); 331 return -1; 332 } 333 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 334 if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 335 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err); 336 return -1; 337 } 338 return 0; 339 } 340 341 static int __init ic_setup_routes(void) 342 { 343 /* No need to setup device routes, only the default route... */ 344 345 if (ic_gateway != NONE) { 346 struct rtentry rm; 347 int err; 348 349 memset(&rm, 0, sizeof(rm)); 350 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 351 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n"); 352 return -1; 353 } 354 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 355 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 356 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 357 rm.rt_flags = RTF_UP | RTF_GATEWAY; 358 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 359 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err); 360 return -1; 361 } 362 } 363 364 return 0; 365 } 366 367 /* 368 * Fill in default values for all missing parameters. 369 */ 370 371 static int __init ic_defaults(void) 372 { 373 /* 374 * At this point we have no userspace running so need not 375 * claim locks on system_utsname 376 */ 377 378 if (!ic_host_name_set) 379 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 380 381 if (root_server_addr == NONE) 382 root_server_addr = ic_servaddr; 383 384 if (ic_netmask == NONE) { 385 if (IN_CLASSA(ntohl(ic_myaddr))) 386 ic_netmask = htonl(IN_CLASSA_NET); 387 else if (IN_CLASSB(ntohl(ic_myaddr))) 388 ic_netmask = htonl(IN_CLASSB_NET); 389 else if (IN_CLASSC(ntohl(ic_myaddr))) 390 ic_netmask = htonl(IN_CLASSC_NET); 391 else { 392 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n", 393 &ic_myaddr); 394 return -1; 395 } 396 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask); 397 } 398 399 return 0; 400 } 401 402 /* 403 * RARP support. 404 */ 405 406 #ifdef IPCONFIG_RARP 407 408 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 409 410 static struct packet_type rarp_packet_type __initdata = { 411 .type = cpu_to_be16(ETH_P_RARP), 412 .func = ic_rarp_recv, 413 }; 414 415 static inline void __init ic_rarp_init(void) 416 { 417 dev_add_pack(&rarp_packet_type); 418 } 419 420 static inline void __init ic_rarp_cleanup(void) 421 { 422 dev_remove_pack(&rarp_packet_type); 423 } 424 425 /* 426 * Process received RARP packet. 427 */ 428 static int __init 429 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 430 { 431 struct arphdr *rarp; 432 unsigned char *rarp_ptr; 433 __be32 sip, tip; 434 unsigned char *sha, *tha; /* s for "source", t for "target" */ 435 struct ic_device *d; 436 437 if (!net_eq(dev_net(dev), &init_net)) 438 goto drop; 439 440 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 441 return NET_RX_DROP; 442 443 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 444 goto drop; 445 446 /* Basic sanity checks can be done without the lock. */ 447 rarp = (struct arphdr *)skb_transport_header(skb); 448 449 /* If this test doesn't pass, it's not IP, or we should 450 * ignore it anyway. 451 */ 452 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 453 goto drop; 454 455 /* If it's not a RARP reply, delete it. */ 456 if (rarp->ar_op != htons(ARPOP_RREPLY)) 457 goto drop; 458 459 /* If it's not Ethernet, delete it. */ 460 if (rarp->ar_pro != htons(ETH_P_IP)) 461 goto drop; 462 463 if (!pskb_may_pull(skb, arp_hdr_len(dev))) 464 goto drop; 465 466 /* OK, it is all there and looks valid, process... */ 467 rarp = (struct arphdr *)skb_transport_header(skb); 468 rarp_ptr = (unsigned char *) (rarp + 1); 469 470 /* One reply at a time, please. */ 471 spin_lock(&ic_recv_lock); 472 473 /* If we already have a reply, just drop the packet */ 474 if (ic_got_reply) 475 goto drop_unlock; 476 477 /* Find the ic_device that the packet arrived on */ 478 d = ic_first_dev; 479 while (d && d->dev != dev) 480 d = d->next; 481 if (!d) 482 goto drop_unlock; /* should never happen */ 483 484 /* Extract variable-width fields */ 485 sha = rarp_ptr; 486 rarp_ptr += dev->addr_len; 487 memcpy(&sip, rarp_ptr, 4); 488 rarp_ptr += 4; 489 tha = rarp_ptr; 490 rarp_ptr += dev->addr_len; 491 memcpy(&tip, rarp_ptr, 4); 492 493 /* Discard packets which are not meant for us. */ 494 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 495 goto drop_unlock; 496 497 /* Discard packets which are not from specified server. */ 498 if (ic_servaddr != NONE && ic_servaddr != sip) 499 goto drop_unlock; 500 501 /* We have a winner! */ 502 ic_dev = dev; 503 if (ic_myaddr == NONE) 504 ic_myaddr = tip; 505 ic_servaddr = sip; 506 ic_got_reply = IC_RARP; 507 508 drop_unlock: 509 /* Show's over. Nothing to see here. */ 510 spin_unlock(&ic_recv_lock); 511 512 drop: 513 /* Throw the packet out. */ 514 kfree_skb(skb); 515 return 0; 516 } 517 518 519 /* 520 * Send RARP request packet over a single interface. 521 */ 522 static void __init ic_rarp_send_if(struct ic_device *d) 523 { 524 struct net_device *dev = d->dev; 525 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 526 dev->dev_addr, dev->dev_addr); 527 } 528 #endif 529 530 /* 531 * DHCP/BOOTP support. 532 */ 533 534 #ifdef IPCONFIG_BOOTP 535 536 struct bootp_pkt { /* BOOTP packet format */ 537 struct iphdr iph; /* IP header */ 538 struct udphdr udph; /* UDP header */ 539 u8 op; /* 1=request, 2=reply */ 540 u8 htype; /* HW address type */ 541 u8 hlen; /* HW address length */ 542 u8 hops; /* Used only by gateways */ 543 __be32 xid; /* Transaction ID */ 544 __be16 secs; /* Seconds since we started */ 545 __be16 flags; /* Just what it says */ 546 __be32 client_ip; /* Client's IP address if known */ 547 __be32 your_ip; /* Assigned IP address */ 548 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 549 __be32 relay_ip; /* IP address of BOOTP relay */ 550 u8 hw_addr[16]; /* Client's HW address */ 551 u8 serv_name[64]; /* Server host name */ 552 u8 boot_file[128]; /* Name of boot file */ 553 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 554 }; 555 556 /* packet ops */ 557 #define BOOTP_REQUEST 1 558 #define BOOTP_REPLY 2 559 560 /* DHCP message types */ 561 #define DHCPDISCOVER 1 562 #define DHCPOFFER 2 563 #define DHCPREQUEST 3 564 #define DHCPDECLINE 4 565 #define DHCPACK 5 566 #define DHCPNAK 6 567 #define DHCPRELEASE 7 568 #define DHCPINFORM 8 569 570 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 571 572 static struct packet_type bootp_packet_type __initdata = { 573 .type = cpu_to_be16(ETH_P_IP), 574 .func = ic_bootp_recv, 575 }; 576 577 578 /* 579 * Initialize DHCP/BOOTP extension fields in the request. 580 */ 581 582 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 583 584 #ifdef IPCONFIG_DHCP 585 586 static void __init 587 ic_dhcp_init_options(u8 *options) 588 { 589 u8 mt = ((ic_servaddr == NONE) 590 ? DHCPDISCOVER : DHCPREQUEST); 591 u8 *e = options; 592 int len; 593 594 #ifdef IPCONFIG_DEBUG 595 printk("DHCP: Sending message type %d\n", mt); 596 #endif 597 598 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 599 e += 4; 600 601 *e++ = 53; /* DHCP message type */ 602 *e++ = 1; 603 *e++ = mt; 604 605 if (mt == DHCPREQUEST) { 606 *e++ = 54; /* Server ID (IP address) */ 607 *e++ = 4; 608 memcpy(e, &ic_servaddr, 4); 609 e += 4; 610 611 *e++ = 50; /* Requested IP address */ 612 *e++ = 4; 613 memcpy(e, &ic_myaddr, 4); 614 e += 4; 615 } 616 617 /* always? */ 618 { 619 static const u8 ic_req_params[] = { 620 1, /* Subnet mask */ 621 3, /* Default gateway */ 622 6, /* DNS server */ 623 12, /* Host name */ 624 15, /* Domain name */ 625 17, /* Boot path */ 626 40, /* NIS domain name */ 627 }; 628 629 *e++ = 55; /* Parameter request list */ 630 *e++ = sizeof(ic_req_params); 631 memcpy(e, ic_req_params, sizeof(ic_req_params)); 632 e += sizeof(ic_req_params); 633 634 if (*vendor_class_identifier) { 635 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n", 636 vendor_class_identifier); 637 *e++ = 60; /* Class-identifier */ 638 len = strlen(vendor_class_identifier); 639 *e++ = len; 640 memcpy(e, vendor_class_identifier, len); 641 e += len; 642 } 643 } 644 645 *e++ = 255; /* End of the list */ 646 } 647 648 #endif /* IPCONFIG_DHCP */ 649 650 static void __init ic_bootp_init_ext(u8 *e) 651 { 652 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 653 e += 4; 654 *e++ = 1; /* Subnet mask request */ 655 *e++ = 4; 656 e += 4; 657 *e++ = 3; /* Default gateway request */ 658 *e++ = 4; 659 e += 4; 660 *e++ = 5; /* Name server request */ 661 *e++ = 8; 662 e += 8; 663 *e++ = 12; /* Host name request */ 664 *e++ = 32; 665 e += 32; 666 *e++ = 40; /* NIS Domain name request */ 667 *e++ = 32; 668 e += 32; 669 *e++ = 17; /* Boot path */ 670 *e++ = 40; 671 e += 40; 672 673 *e++ = 57; /* set extension buffer size for reply */ 674 *e++ = 2; 675 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 676 *e++ = 150; 677 678 *e++ = 255; /* End of the list */ 679 } 680 681 682 /* 683 * Initialize the DHCP/BOOTP mechanism. 684 */ 685 static inline void __init ic_bootp_init(void) 686 { 687 int i; 688 689 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 690 ic_nameservers[i] = NONE; 691 692 dev_add_pack(&bootp_packet_type); 693 } 694 695 696 /* 697 * DHCP/BOOTP cleanup. 698 */ 699 static inline void __init ic_bootp_cleanup(void) 700 { 701 dev_remove_pack(&bootp_packet_type); 702 } 703 704 705 /* 706 * Send DHCP/BOOTP request to single interface. 707 */ 708 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 709 { 710 struct net_device *dev = d->dev; 711 struct sk_buff *skb; 712 struct bootp_pkt *b; 713 struct iphdr *h; 714 715 /* Allocate packet */ 716 skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15, 717 GFP_KERNEL); 718 if (!skb) 719 return; 720 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 721 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 722 memset(b, 0, sizeof(struct bootp_pkt)); 723 724 /* Construct IP header */ 725 skb_reset_network_header(skb); 726 h = ip_hdr(skb); 727 h->version = 4; 728 h->ihl = 5; 729 h->tot_len = htons(sizeof(struct bootp_pkt)); 730 h->frag_off = htons(IP_DF); 731 h->ttl = 64; 732 h->protocol = IPPROTO_UDP; 733 h->daddr = htonl(INADDR_BROADCAST); 734 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 735 736 /* Construct UDP header */ 737 b->udph.source = htons(68); 738 b->udph.dest = htons(67); 739 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 740 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 741 742 /* Construct DHCP/BOOTP header */ 743 b->op = BOOTP_REQUEST; 744 if (dev->type < 256) /* check for false types */ 745 b->htype = dev->type; 746 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ 747 b->htype = ARPHRD_IEEE802; 748 else if (dev->type == ARPHRD_FDDI) 749 b->htype = ARPHRD_ETHER; 750 else { 751 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 752 b->htype = dev->type; /* can cause undefined behavior */ 753 } 754 755 /* server_ip and your_ip address are both already zero per RFC2131 */ 756 b->hlen = dev->addr_len; 757 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 758 b->secs = htons(jiffies_diff / HZ); 759 b->xid = d->xid; 760 761 /* add DHCP options or BOOTP extensions */ 762 #ifdef IPCONFIG_DHCP 763 if (ic_proto_enabled & IC_USE_DHCP) 764 ic_dhcp_init_options(b->exten); 765 else 766 #endif 767 ic_bootp_init_ext(b->exten); 768 769 /* Chain packet down the line... */ 770 skb->dev = dev; 771 skb->protocol = htons(ETH_P_IP); 772 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 773 dev->broadcast, dev->dev_addr, skb->len) < 0 || 774 dev_queue_xmit(skb) < 0) 775 printk("E"); 776 } 777 778 779 /* 780 * Copy BOOTP-supplied string if not already set. 781 */ 782 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 783 { 784 if (!len) 785 return 0; 786 if (len > max-1) 787 len = max-1; 788 memcpy(dest, src, len); 789 dest[len] = '\0'; 790 return 1; 791 } 792 793 794 /* 795 * Process BOOTP extensions. 796 */ 797 static void __init ic_do_bootp_ext(u8 *ext) 798 { 799 u8 servers; 800 int i; 801 802 #ifdef IPCONFIG_DEBUG 803 u8 *c; 804 805 printk("DHCP/BOOTP: Got extension %d:",*ext); 806 for (c=ext+2; c<ext+2+ext[1]; c++) 807 printk(" %02x", *c); 808 printk("\n"); 809 #endif 810 811 switch (*ext++) { 812 case 1: /* Subnet mask */ 813 if (ic_netmask == NONE) 814 memcpy(&ic_netmask, ext+1, 4); 815 break; 816 case 3: /* Default gateway */ 817 if (ic_gateway == NONE) 818 memcpy(&ic_gateway, ext+1, 4); 819 break; 820 case 6: /* DNS server */ 821 servers= *ext/4; 822 if (servers > CONF_NAMESERVERS_MAX) 823 servers = CONF_NAMESERVERS_MAX; 824 for (i = 0; i < servers; i++) { 825 if (ic_nameservers[i] == NONE) 826 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 827 } 828 break; 829 case 12: /* Host name */ 830 ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN); 831 ic_host_name_set = 1; 832 break; 833 case 15: /* Domain name (DNS) */ 834 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 835 break; 836 case 17: /* Root path */ 837 if (!root_server_path[0]) 838 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path)); 839 break; 840 case 40: /* NIS Domain name (_not_ DNS) */ 841 ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN); 842 break; 843 } 844 } 845 846 847 /* 848 * Receive BOOTP reply. 849 */ 850 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 851 { 852 struct bootp_pkt *b; 853 struct iphdr *h; 854 struct ic_device *d; 855 int len, ext_len; 856 857 if (!net_eq(dev_net(dev), &init_net)) 858 goto drop; 859 860 /* Perform verifications before taking the lock. */ 861 if (skb->pkt_type == PACKET_OTHERHOST) 862 goto drop; 863 864 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 865 return NET_RX_DROP; 866 867 if (!pskb_may_pull(skb, 868 sizeof(struct iphdr) + 869 sizeof(struct udphdr))) 870 goto drop; 871 872 b = (struct bootp_pkt *)skb_network_header(skb); 873 h = &b->iph; 874 875 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 876 goto drop; 877 878 /* Fragments are not supported */ 879 if (h->frag_off & htons(IP_OFFSET | IP_MF)) { 880 if (net_ratelimit()) 881 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " 882 "reply.\n"); 883 goto drop; 884 } 885 886 if (skb->len < ntohs(h->tot_len)) 887 goto drop; 888 889 if (ip_fast_csum((char *) h, h->ihl)) 890 goto drop; 891 892 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 893 goto drop; 894 895 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 896 goto drop; 897 898 len = ntohs(b->udph.len) - sizeof(struct udphdr); 899 ext_len = len - (sizeof(*b) - 900 sizeof(struct iphdr) - 901 sizeof(struct udphdr) - 902 sizeof(b->exten)); 903 if (ext_len < 0) 904 goto drop; 905 906 /* Ok the front looks good, make sure we can get at the rest. */ 907 if (!pskb_may_pull(skb, skb->len)) 908 goto drop; 909 910 b = (struct bootp_pkt *)skb_network_header(skb); 911 h = &b->iph; 912 913 /* One reply at a time, please. */ 914 spin_lock(&ic_recv_lock); 915 916 /* If we already have a reply, just drop the packet */ 917 if (ic_got_reply) 918 goto drop_unlock; 919 920 /* Find the ic_device that the packet arrived on */ 921 d = ic_first_dev; 922 while (d && d->dev != dev) 923 d = d->next; 924 if (!d) 925 goto drop_unlock; /* should never happen */ 926 927 /* Is it a reply to our BOOTP request? */ 928 if (b->op != BOOTP_REPLY || 929 b->xid != d->xid) { 930 if (net_ratelimit()) 931 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " 932 "op[%x] xid[%x]\n", 933 b->op, b->xid); 934 goto drop_unlock; 935 } 936 937 /* Is it a reply for the device we are configuring? */ 938 if (b->xid != ic_dev_xid) { 939 if (net_ratelimit()) 940 printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet \n"); 941 goto drop_unlock; 942 } 943 944 /* Parse extensions */ 945 if (ext_len >= 4 && 946 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 947 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 948 u8 *ext; 949 950 #ifdef IPCONFIG_DHCP 951 if (ic_proto_enabled & IC_USE_DHCP) { 952 __be32 server_id = NONE; 953 int mt = 0; 954 955 ext = &b->exten[4]; 956 while (ext < end && *ext != 0xff) { 957 u8 *opt = ext++; 958 if (*opt == 0) /* Padding */ 959 continue; 960 ext += *ext + 1; 961 if (ext >= end) 962 break; 963 switch (*opt) { 964 case 53: /* Message type */ 965 if (opt[1]) 966 mt = opt[2]; 967 break; 968 case 54: /* Server ID (IP address) */ 969 if (opt[1] >= 4) 970 memcpy(&server_id, opt + 2, 4); 971 break; 972 } 973 } 974 975 #ifdef IPCONFIG_DEBUG 976 printk("DHCP: Got message type %d\n", mt); 977 #endif 978 979 switch (mt) { 980 case DHCPOFFER: 981 /* While in the process of accepting one offer, 982 * ignore all others. 983 */ 984 if (ic_myaddr != NONE) 985 goto drop_unlock; 986 987 /* Let's accept that offer. */ 988 ic_myaddr = b->your_ip; 989 ic_servaddr = server_id; 990 #ifdef IPCONFIG_DEBUG 991 printk("DHCP: Offered address %pI4 by server %pI4\n", 992 &ic_myaddr, &ic_servaddr); 993 #endif 994 /* The DHCP indicated server address takes 995 * precedence over the bootp header one if 996 * they are different. 997 */ 998 if ((server_id != NONE) && 999 (b->server_ip != server_id)) 1000 b->server_ip = ic_servaddr; 1001 break; 1002 1003 case DHCPACK: 1004 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1005 goto drop_unlock; 1006 1007 /* Yeah! */ 1008 break; 1009 1010 default: 1011 /* Urque. Forget it*/ 1012 ic_myaddr = NONE; 1013 ic_servaddr = NONE; 1014 goto drop_unlock; 1015 } 1016 1017 ic_dhcp_msgtype = mt; 1018 1019 } 1020 #endif /* IPCONFIG_DHCP */ 1021 1022 ext = &b->exten[4]; 1023 while (ext < end && *ext != 0xff) { 1024 u8 *opt = ext++; 1025 if (*opt == 0) /* Padding */ 1026 continue; 1027 ext += *ext + 1; 1028 if (ext < end) 1029 ic_do_bootp_ext(opt); 1030 } 1031 } 1032 1033 /* We have a winner! */ 1034 ic_dev = dev; 1035 ic_myaddr = b->your_ip; 1036 ic_servaddr = b->server_ip; 1037 if (ic_gateway == NONE && b->relay_ip) 1038 ic_gateway = b->relay_ip; 1039 if (ic_nameservers[0] == NONE) 1040 ic_nameservers[0] = ic_servaddr; 1041 ic_got_reply = IC_BOOTP; 1042 1043 drop_unlock: 1044 /* Show's over. Nothing to see here. */ 1045 spin_unlock(&ic_recv_lock); 1046 1047 drop: 1048 /* Throw the packet out. */ 1049 kfree_skb(skb); 1050 1051 return 0; 1052 } 1053 1054 1055 #endif 1056 1057 1058 /* 1059 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1060 */ 1061 1062 #ifdef IPCONFIG_DYNAMIC 1063 1064 static int __init ic_dynamic(void) 1065 { 1066 int retries; 1067 struct ic_device *d; 1068 unsigned long start_jiffies, timeout, jiff; 1069 int do_bootp = ic_proto_have_if & IC_BOOTP; 1070 int do_rarp = ic_proto_have_if & IC_RARP; 1071 1072 /* 1073 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1074 * This routine gets only called when some pieces of information 1075 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1076 */ 1077 if (!ic_proto_enabled) { 1078 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1079 return -1; 1080 } 1081 1082 #ifdef IPCONFIG_BOOTP 1083 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1084 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); 1085 #endif 1086 #ifdef IPCONFIG_RARP 1087 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1088 printk(KERN_ERR "RARP: No suitable device found.\n"); 1089 #endif 1090 1091 if (!ic_proto_have_if) 1092 /* Error message already printed */ 1093 return -1; 1094 1095 /* 1096 * Setup protocols 1097 */ 1098 #ifdef IPCONFIG_BOOTP 1099 if (do_bootp) 1100 ic_bootp_init(); 1101 #endif 1102 #ifdef IPCONFIG_RARP 1103 if (do_rarp) 1104 ic_rarp_init(); 1105 #endif 1106 1107 /* 1108 * Send requests and wait, until we get an answer. This loop 1109 * seems to be a terrible waste of CPU time, but actually there is 1110 * only one process running at all, so we don't need to use any 1111 * scheduler functions. 1112 * [Actually we could now, but the nothing else running note still 1113 * applies.. - AC] 1114 */ 1115 printk(KERN_NOTICE "Sending %s%s%s requests .", 1116 do_bootp 1117 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1118 (do_bootp && do_rarp) ? " and " : "", 1119 do_rarp ? "RARP" : ""); 1120 1121 start_jiffies = jiffies; 1122 d = ic_first_dev; 1123 retries = CONF_SEND_RETRIES; 1124 get_random_bytes(&timeout, sizeof(timeout)); 1125 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); 1126 for (;;) { 1127 /* Track the device we are configuring */ 1128 ic_dev_xid = d->xid; 1129 1130 #ifdef IPCONFIG_BOOTP 1131 if (do_bootp && (d->able & IC_BOOTP)) 1132 ic_bootp_send_if(d, jiffies - start_jiffies); 1133 #endif 1134 #ifdef IPCONFIG_RARP 1135 if (do_rarp && (d->able & IC_RARP)) 1136 ic_rarp_send_if(d); 1137 #endif 1138 1139 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1140 while (time_before(jiffies, jiff) && !ic_got_reply) 1141 schedule_timeout_uninterruptible(1); 1142 #ifdef IPCONFIG_DHCP 1143 /* DHCP isn't done until we get a DHCPACK. */ 1144 if ((ic_got_reply & IC_BOOTP) 1145 && (ic_proto_enabled & IC_USE_DHCP) 1146 && ic_dhcp_msgtype != DHCPACK) 1147 { 1148 ic_got_reply = 0; 1149 printk(","); 1150 continue; 1151 } 1152 #endif /* IPCONFIG_DHCP */ 1153 1154 if (ic_got_reply) { 1155 printk(" OK\n"); 1156 break; 1157 } 1158 1159 if ((d = d->next)) 1160 continue; 1161 1162 if (! --retries) { 1163 printk(" timed out!\n"); 1164 break; 1165 } 1166 1167 d = ic_first_dev; 1168 1169 timeout = timeout CONF_TIMEOUT_MULT; 1170 if (timeout > CONF_TIMEOUT_MAX) 1171 timeout = CONF_TIMEOUT_MAX; 1172 1173 printk("."); 1174 } 1175 1176 #ifdef IPCONFIG_BOOTP 1177 if (do_bootp) 1178 ic_bootp_cleanup(); 1179 #endif 1180 #ifdef IPCONFIG_RARP 1181 if (do_rarp) 1182 ic_rarp_cleanup(); 1183 #endif 1184 1185 if (!ic_got_reply) { 1186 ic_myaddr = NONE; 1187 return -1; 1188 } 1189 1190 printk("IP-Config: Got %s answer from %pI4, ", 1191 ((ic_got_reply & IC_RARP) ? "RARP" 1192 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1193 &ic_servaddr); 1194 printk("my address is %pI4\n", &ic_myaddr); 1195 1196 return 0; 1197 } 1198 1199 #endif /* IPCONFIG_DYNAMIC */ 1200 1201 #ifdef CONFIG_PROC_FS 1202 1203 static int pnp_seq_show(struct seq_file *seq, void *v) 1204 { 1205 int i; 1206 1207 if (ic_proto_used & IC_PROTO) 1208 seq_printf(seq, "#PROTO: %s\n", 1209 (ic_proto_used & IC_RARP) ? "RARP" 1210 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1211 else 1212 seq_puts(seq, "#MANUAL\n"); 1213 1214 if (ic_domain[0]) 1215 seq_printf(seq, 1216 "domain %s\n", ic_domain); 1217 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1218 if (ic_nameservers[i] != NONE) 1219 seq_printf(seq, "nameserver %pI4\n", 1220 &ic_nameservers[i]); 1221 } 1222 if (ic_servaddr != NONE) 1223 seq_printf(seq, "bootserver %pI4\n", 1224 &ic_servaddr); 1225 return 0; 1226 } 1227 1228 static int pnp_seq_open(struct inode *indoe, struct file *file) 1229 { 1230 return single_open(file, pnp_seq_show, NULL); 1231 } 1232 1233 static const struct file_operations pnp_seq_fops = { 1234 .owner = THIS_MODULE, 1235 .open = pnp_seq_open, 1236 .read = seq_read, 1237 .llseek = seq_lseek, 1238 .release = single_release, 1239 }; 1240 #endif /* CONFIG_PROC_FS */ 1241 1242 /* 1243 * Extract IP address from the parameter string if needed. Note that we 1244 * need to have root_server_addr set _before_ IPConfig gets called as it 1245 * can override it. 1246 */ 1247 __be32 __init root_nfs_parse_addr(char *name) 1248 { 1249 __be32 addr; 1250 int octets = 0; 1251 char *cp, *cq; 1252 1253 cp = cq = name; 1254 while (octets < 4) { 1255 while (*cp >= '0' && *cp <= '9') 1256 cp++; 1257 if (cp == cq || cp - cq > 3) 1258 break; 1259 if (*cp == '.' || octets == 3) 1260 octets++; 1261 if (octets < 4) 1262 cp++; 1263 cq = cp; 1264 } 1265 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1266 if (*cp == ':') 1267 *cp++ = '\0'; 1268 addr = in_aton(name); 1269 memmove(name, cp, strlen(cp) + 1); 1270 } else 1271 addr = NONE; 1272 1273 return addr; 1274 } 1275 1276 /* 1277 * IP Autoconfig dispatcher. 1278 */ 1279 1280 static int __init ip_auto_config(void) 1281 { 1282 __be32 addr; 1283 #ifdef IPCONFIG_DYNAMIC 1284 int retries = CONF_OPEN_RETRIES; 1285 #endif 1286 1287 #ifdef CONFIG_PROC_FS 1288 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops); 1289 #endif /* CONFIG_PROC_FS */ 1290 1291 if (!ic_enable) 1292 return 0; 1293 1294 DBG(("IP-Config: Entered.\n")); 1295 #ifdef IPCONFIG_DYNAMIC 1296 try_try_again: 1297 #endif 1298 /* Give hardware a chance to settle */ 1299 msleep(CONF_PRE_OPEN); 1300 1301 /* Setup all network devices */ 1302 if (ic_open_devs() < 0) 1303 return -1; 1304 1305 /* Give drivers a chance to settle */ 1306 ssleep(CONF_POST_OPEN); 1307 1308 /* 1309 * If the config information is insufficient (e.g., our IP address or 1310 * IP address of the boot server is missing or we have multiple network 1311 * interfaces and no default was set), use BOOTP or RARP to get the 1312 * missing values. 1313 */ 1314 if (ic_myaddr == NONE || 1315 #ifdef CONFIG_ROOT_NFS 1316 (root_server_addr == NONE 1317 && ic_servaddr == NONE 1318 && ROOT_DEV == Root_NFS) || 1319 #endif 1320 ic_first_dev->next) { 1321 #ifdef IPCONFIG_DYNAMIC 1322 if (ic_dynamic() < 0) { 1323 ic_close_devs(); 1324 1325 /* 1326 * I don't know why, but sometimes the 1327 * eepro100 driver (at least) gets upset and 1328 * doesn't work the first time it's opened. 1329 * But then if you close it and reopen it, it 1330 * works just fine. So we need to try that at 1331 * least once before giving up. 1332 * 1333 * Also, if the root will be NFS-mounted, we 1334 * have nowhere to go if DHCP fails. So we 1335 * just have to keep trying forever. 1336 * 1337 * -- Chip 1338 */ 1339 #ifdef CONFIG_ROOT_NFS 1340 if (ROOT_DEV == Root_NFS) { 1341 printk(KERN_ERR 1342 "IP-Config: Retrying forever (NFS root)...\n"); 1343 goto try_try_again; 1344 } 1345 #endif 1346 1347 if (--retries) { 1348 printk(KERN_ERR 1349 "IP-Config: Reopening network devices...\n"); 1350 goto try_try_again; 1351 } 1352 1353 /* Oh, well. At least we tried. */ 1354 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); 1355 return -1; 1356 } 1357 #else /* !DYNAMIC */ 1358 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1359 ic_close_devs(); 1360 return -1; 1361 #endif /* IPCONFIG_DYNAMIC */ 1362 } else { 1363 /* Device selected manually or only one device -> use it */ 1364 ic_dev = ic_first_dev->dev; 1365 } 1366 1367 addr = root_nfs_parse_addr(root_server_path); 1368 if (root_server_addr == NONE) 1369 root_server_addr = addr; 1370 1371 /* 1372 * Use defaults whereever applicable. 1373 */ 1374 if (ic_defaults() < 0) 1375 return -1; 1376 1377 /* 1378 * Close all network devices except the device we've 1379 * autoconfigured and set up routes. 1380 */ 1381 ic_close_devs(); 1382 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1383 return -1; 1384 1385 /* 1386 * Record which protocol was actually used. 1387 */ 1388 #ifdef IPCONFIG_DYNAMIC 1389 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1390 #endif 1391 1392 #ifndef IPCONFIG_SILENT 1393 /* 1394 * Clue in the operator. 1395 */ 1396 printk("IP-Config: Complete:"); 1397 printk("\n device=%s", ic_dev->name); 1398 printk(", addr=%pI4", &ic_myaddr); 1399 printk(", mask=%pI4", &ic_netmask); 1400 printk(", gw=%pI4", &ic_gateway); 1401 printk(",\n host=%s, domain=%s, nis-domain=%s", 1402 utsname()->nodename, ic_domain, utsname()->domainname); 1403 printk(",\n bootserver=%pI4", &ic_servaddr); 1404 printk(", rootserver=%pI4", &root_server_addr); 1405 printk(", rootpath=%s", root_server_path); 1406 printk("\n"); 1407 #endif /* !SILENT */ 1408 1409 return 0; 1410 } 1411 1412 late_initcall(ip_auto_config); 1413 1414 1415 /* 1416 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1417 * command line parameter. See Documentation/filesystems/nfsroot.txt. 1418 */ 1419 static int __init ic_proto_name(char *name) 1420 { 1421 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1422 return 1; 1423 } 1424 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1425 return 0; 1426 } 1427 #ifdef CONFIG_IP_PNP_DHCP 1428 else if (!strcmp(name, "dhcp")) { 1429 ic_proto_enabled &= ~IC_RARP; 1430 return 1; 1431 } 1432 #endif 1433 #ifdef CONFIG_IP_PNP_BOOTP 1434 else if (!strcmp(name, "bootp")) { 1435 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1436 return 1; 1437 } 1438 #endif 1439 #ifdef CONFIG_IP_PNP_RARP 1440 else if (!strcmp(name, "rarp")) { 1441 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1442 return 1; 1443 } 1444 #endif 1445 #ifdef IPCONFIG_DYNAMIC 1446 else if (!strcmp(name, "both")) { 1447 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1448 return 1; 1449 } 1450 #endif 1451 return 0; 1452 } 1453 1454 static int __init ip_auto_config_setup(char *addrs) 1455 { 1456 char *cp, *ip, *dp; 1457 int num = 0; 1458 1459 ic_set_manually = 1; 1460 ic_enable = 1; 1461 1462 /* 1463 * If any dhcp, bootp etc options are set, leave autoconfig on 1464 * and skip the below static IP processing. 1465 */ 1466 if (ic_proto_name(addrs)) 1467 return 1; 1468 1469 /* If no static IP is given, turn off autoconfig and bail. */ 1470 if (*addrs == 0 || 1471 strcmp(addrs, "off") == 0 || 1472 strcmp(addrs, "none") == 0) { 1473 ic_enable = 0; 1474 return 1; 1475 } 1476 1477 /* Parse string for static IP assignment. */ 1478 ip = addrs; 1479 while (ip && *ip) { 1480 if ((cp = strchr(ip, ':'))) 1481 *cp++ = '\0'; 1482 if (strlen(ip) > 0) { 1483 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); 1484 switch (num) { 1485 case 0: 1486 if ((ic_myaddr = in_aton(ip)) == ANY) 1487 ic_myaddr = NONE; 1488 break; 1489 case 1: 1490 if ((ic_servaddr = in_aton(ip)) == ANY) 1491 ic_servaddr = NONE; 1492 break; 1493 case 2: 1494 if ((ic_gateway = in_aton(ip)) == ANY) 1495 ic_gateway = NONE; 1496 break; 1497 case 3: 1498 if ((ic_netmask = in_aton(ip)) == ANY) 1499 ic_netmask = NONE; 1500 break; 1501 case 4: 1502 if ((dp = strchr(ip, '.'))) { 1503 *dp++ = '\0'; 1504 strlcpy(utsname()->domainname, dp, 1505 sizeof(utsname()->domainname)); 1506 } 1507 strlcpy(utsname()->nodename, ip, 1508 sizeof(utsname()->nodename)); 1509 ic_host_name_set = 1; 1510 break; 1511 case 5: 1512 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1513 break; 1514 case 6: 1515 if (ic_proto_name(ip) == 0 && 1516 ic_myaddr == NONE) { 1517 ic_enable = 0; 1518 } 1519 break; 1520 } 1521 } 1522 ip = cp; 1523 num++; 1524 } 1525 1526 return 1; 1527 } 1528 1529 static int __init nfsaddrs_config_setup(char *addrs) 1530 { 1531 return ip_auto_config_setup(addrs); 1532 } 1533 1534 static int __init vendor_class_identifier_setup(char *addrs) 1535 { 1536 if (strlcpy(vendor_class_identifier, addrs, 1537 sizeof(vendor_class_identifier)) 1538 >= sizeof(vendor_class_identifier)) 1539 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"", 1540 vendor_class_identifier); 1541 return 1; 1542 } 1543 1544 __setup("ip=", ip_auto_config_setup); 1545 __setup("nfsaddrs=", nfsaddrs_config_setup); 1546 __setup("dhcpclass=", vendor_class_identifier_setup); 1547