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 <linux/slab.h> 57 #include <net/net_namespace.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_POST_OPEN 10 /* After opening: 10 msecs */ 91 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */ 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 cpu_to_be32(INADDR_NONE) 105 #define ANY cpu_to_be32(INADDR_ANY) 106 107 /* 108 * Public IP configuration 109 */ 110 111 /* This is used by platforms which might be able to set the ipconfig 112 * variables using firmware environment vars. If this is set, it will 113 * ignore such firmware variables. 114 */ 115 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ 116 117 static int ic_enable __initdata = 0; /* IP config enabled? */ 118 119 /* Protocol choice */ 120 int ic_proto_enabled __initdata = 0 121 #ifdef IPCONFIG_BOOTP 122 | IC_BOOTP 123 #endif 124 #ifdef CONFIG_IP_PNP_DHCP 125 | IC_USE_DHCP 126 #endif 127 #ifdef IPCONFIG_RARP 128 | IC_RARP 129 #endif 130 ; 131 132 static int ic_host_name_set __initdata = 0; /* Host name set by us? */ 133 134 __be32 ic_myaddr = NONE; /* My IP address */ 135 static __be32 ic_netmask = NONE; /* Netmask for local subnet */ 136 __be32 ic_gateway = NONE; /* Gateway IP address */ 137 138 __be32 ic_servaddr = NONE; /* Boot server IP address */ 139 140 __be32 root_server_addr = NONE; /* Address of NFS server */ 141 u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 142 143 u32 ic_dev_xid; /* Device under configuration */ 144 145 /* vendor class identifier */ 146 static char vendor_class_identifier[253] __initdata; 147 148 /* Persistent data: */ 149 150 static int ic_proto_used; /* Protocol used, if any */ 151 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 152 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 153 154 /* 155 * Private state. 156 */ 157 158 /* Name of user-selected boot device */ 159 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 160 161 /* Protocols supported by available interfaces */ 162 static int ic_proto_have_if __initdata = 0; 163 164 /* MTU for boot device */ 165 static int ic_dev_mtu __initdata = 0; 166 167 #ifdef IPCONFIG_DYNAMIC 168 static DEFINE_SPINLOCK(ic_recv_lock); 169 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */ 170 #endif 171 #ifdef IPCONFIG_DHCP 172 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */ 173 #endif 174 175 176 /* 177 * Network devices 178 */ 179 180 struct ic_device { 181 struct ic_device *next; 182 struct net_device *dev; 183 unsigned short flags; 184 short able; 185 __be32 xid; 186 }; 187 188 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */ 189 static struct net_device *ic_dev __initdata = NULL; /* Selected device */ 190 191 static bool __init ic_is_init_dev(struct net_device *dev) 192 { 193 if (dev->flags & IFF_LOOPBACK) 194 return false; 195 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 196 (!(dev->flags & IFF_LOOPBACK) && 197 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 198 strncmp(dev->name, "dummy", 5)); 199 } 200 201 static int __init ic_open_devs(void) 202 { 203 struct ic_device *d, **last; 204 struct net_device *dev; 205 unsigned short oflags; 206 unsigned long start; 207 208 last = &ic_first_dev; 209 rtnl_lock(); 210 211 /* bring loopback device up first */ 212 for_each_netdev(&init_net, dev) { 213 if (!(dev->flags & IFF_LOOPBACK)) 214 continue; 215 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) 216 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); 217 } 218 219 for_each_netdev(&init_net, dev) { 220 if (ic_is_init_dev(dev)) { 221 int able = 0; 222 if (dev->mtu >= 364) 223 able |= IC_BOOTP; 224 else 225 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu); 226 if (!(dev->flags & IFF_NOARP)) 227 able |= IC_RARP; 228 able &= ic_proto_enabled; 229 if (ic_proto_enabled && !able) 230 continue; 231 oflags = dev->flags; 232 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 233 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); 234 continue; 235 } 236 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 237 rtnl_unlock(); 238 return -ENOMEM; 239 } 240 d->dev = dev; 241 *last = d; 242 last = &d->next; 243 d->flags = oflags; 244 d->able = able; 245 if (able & IC_BOOTP) 246 get_random_bytes(&d->xid, sizeof(__be32)); 247 else 248 d->xid = 0; 249 ic_proto_have_if |= able; 250 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", 251 dev->name, able, d->xid)); 252 } 253 } 254 255 /* wait for a carrier on at least one device */ 256 start = jiffies; 257 while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) { 258 for_each_netdev(&init_net, dev) 259 if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) 260 goto have_carrier; 261 262 msleep(1); 263 } 264 have_carrier: 265 rtnl_unlock(); 266 267 *last = NULL; 268 269 if (!ic_first_dev) { 270 if (user_dev_name[0]) 271 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name); 272 else 273 printk(KERN_ERR "IP-Config: No network devices available.\n"); 274 return -ENODEV; 275 } 276 return 0; 277 } 278 279 static void __init ic_close_devs(void) 280 { 281 struct ic_device *d, *next; 282 struct net_device *dev; 283 284 rtnl_lock(); 285 next = ic_first_dev; 286 while ((d = next)) { 287 next = d->next; 288 dev = d->dev; 289 if (dev != ic_dev) { 290 DBG(("IP-Config: Downing %s\n", dev->name)); 291 dev_change_flags(dev, d->flags); 292 } 293 kfree(d); 294 } 295 rtnl_unlock(); 296 } 297 298 /* 299 * Interface to various network functions. 300 */ 301 302 static inline void 303 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 304 { 305 sin->sin_family = AF_INET; 306 sin->sin_addr.s_addr = addr; 307 sin->sin_port = port; 308 } 309 310 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg) 311 { 312 int res; 313 314 mm_segment_t oldfs = get_fs(); 315 set_fs(get_ds()); 316 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 317 set_fs(oldfs); 318 return res; 319 } 320 321 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 322 { 323 int res; 324 325 mm_segment_t oldfs = get_fs(); 326 set_fs(get_ds()); 327 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 328 set_fs(oldfs); 329 return res; 330 } 331 332 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 333 { 334 int res; 335 336 mm_segment_t oldfs = get_fs(); 337 set_fs(get_ds()); 338 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); 339 set_fs(oldfs); 340 return res; 341 } 342 343 /* 344 * Set up interface addresses and routes. 345 */ 346 347 static int __init ic_setup_if(void) 348 { 349 struct ifreq ir; 350 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 351 int err; 352 353 memset(&ir, 0, sizeof(ir)); 354 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); 355 set_sockaddr(sin, ic_myaddr, 0); 356 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) { 357 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err); 358 return -1; 359 } 360 set_sockaddr(sin, ic_netmask, 0); 361 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 362 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err); 363 return -1; 364 } 365 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 366 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 367 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err); 368 return -1; 369 } 370 /* Handle the case where we need non-standard MTU on the boot link (a network 371 * using jumbo frames, for instance). If we can't set the mtu, don't error 372 * out, we'll try to muddle along. 373 */ 374 if (ic_dev_mtu != 0) { 375 strcpy(ir.ifr_name, ic_dev->name); 376 ir.ifr_mtu = ic_dev_mtu; 377 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0) 378 printk(KERN_ERR "IP-Config: Unable to set interface mtu to %d (%d).\n", 379 ic_dev_mtu, err); 380 } 381 return 0; 382 } 383 384 static int __init ic_setup_routes(void) 385 { 386 /* No need to setup device routes, only the default route... */ 387 388 if (ic_gateway != NONE) { 389 struct rtentry rm; 390 int err; 391 392 memset(&rm, 0, sizeof(rm)); 393 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 394 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n"); 395 return -1; 396 } 397 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 398 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 399 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 400 rm.rt_flags = RTF_UP | RTF_GATEWAY; 401 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 402 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err); 403 return -1; 404 } 405 } 406 407 return 0; 408 } 409 410 /* 411 * Fill in default values for all missing parameters. 412 */ 413 414 static int __init ic_defaults(void) 415 { 416 /* 417 * At this point we have no userspace running so need not 418 * claim locks on system_utsname 419 */ 420 421 if (!ic_host_name_set) 422 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 423 424 if (root_server_addr == NONE) 425 root_server_addr = ic_servaddr; 426 427 if (ic_netmask == NONE) { 428 if (IN_CLASSA(ntohl(ic_myaddr))) 429 ic_netmask = htonl(IN_CLASSA_NET); 430 else if (IN_CLASSB(ntohl(ic_myaddr))) 431 ic_netmask = htonl(IN_CLASSB_NET); 432 else if (IN_CLASSC(ntohl(ic_myaddr))) 433 ic_netmask = htonl(IN_CLASSC_NET); 434 else { 435 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n", 436 &ic_myaddr); 437 return -1; 438 } 439 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask); 440 } 441 442 return 0; 443 } 444 445 /* 446 * RARP support. 447 */ 448 449 #ifdef IPCONFIG_RARP 450 451 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 452 453 static struct packet_type rarp_packet_type __initdata = { 454 .type = cpu_to_be16(ETH_P_RARP), 455 .func = ic_rarp_recv, 456 }; 457 458 static inline void __init ic_rarp_init(void) 459 { 460 dev_add_pack(&rarp_packet_type); 461 } 462 463 static inline void __init ic_rarp_cleanup(void) 464 { 465 dev_remove_pack(&rarp_packet_type); 466 } 467 468 /* 469 * Process received RARP packet. 470 */ 471 static int __init 472 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 473 { 474 struct arphdr *rarp; 475 unsigned char *rarp_ptr; 476 __be32 sip, tip; 477 unsigned char *sha, *tha; /* s for "source", t for "target" */ 478 struct ic_device *d; 479 480 if (!net_eq(dev_net(dev), &init_net)) 481 goto drop; 482 483 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 484 return NET_RX_DROP; 485 486 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 487 goto drop; 488 489 /* Basic sanity checks can be done without the lock. */ 490 rarp = (struct arphdr *)skb_transport_header(skb); 491 492 /* If this test doesn't pass, it's not IP, or we should 493 * ignore it anyway. 494 */ 495 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 496 goto drop; 497 498 /* If it's not a RARP reply, delete it. */ 499 if (rarp->ar_op != htons(ARPOP_RREPLY)) 500 goto drop; 501 502 /* If it's not Ethernet, delete it. */ 503 if (rarp->ar_pro != htons(ETH_P_IP)) 504 goto drop; 505 506 if (!pskb_may_pull(skb, arp_hdr_len(dev))) 507 goto drop; 508 509 /* OK, it is all there and looks valid, process... */ 510 rarp = (struct arphdr *)skb_transport_header(skb); 511 rarp_ptr = (unsigned char *) (rarp + 1); 512 513 /* One reply at a time, please. */ 514 spin_lock(&ic_recv_lock); 515 516 /* If we already have a reply, just drop the packet */ 517 if (ic_got_reply) 518 goto drop_unlock; 519 520 /* Find the ic_device that the packet arrived on */ 521 d = ic_first_dev; 522 while (d && d->dev != dev) 523 d = d->next; 524 if (!d) 525 goto drop_unlock; /* should never happen */ 526 527 /* Extract variable-width fields */ 528 sha = rarp_ptr; 529 rarp_ptr += dev->addr_len; 530 memcpy(&sip, rarp_ptr, 4); 531 rarp_ptr += 4; 532 tha = rarp_ptr; 533 rarp_ptr += dev->addr_len; 534 memcpy(&tip, rarp_ptr, 4); 535 536 /* Discard packets which are not meant for us. */ 537 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 538 goto drop_unlock; 539 540 /* Discard packets which are not from specified server. */ 541 if (ic_servaddr != NONE && ic_servaddr != sip) 542 goto drop_unlock; 543 544 /* We have a winner! */ 545 ic_dev = dev; 546 if (ic_myaddr == NONE) 547 ic_myaddr = tip; 548 ic_servaddr = sip; 549 ic_got_reply = IC_RARP; 550 551 drop_unlock: 552 /* Show's over. Nothing to see here. */ 553 spin_unlock(&ic_recv_lock); 554 555 drop: 556 /* Throw the packet out. */ 557 kfree_skb(skb); 558 return 0; 559 } 560 561 562 /* 563 * Send RARP request packet over a single interface. 564 */ 565 static void __init ic_rarp_send_if(struct ic_device *d) 566 { 567 struct net_device *dev = d->dev; 568 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 569 dev->dev_addr, dev->dev_addr); 570 } 571 #endif 572 573 /* 574 * DHCP/BOOTP support. 575 */ 576 577 #ifdef IPCONFIG_BOOTP 578 579 struct bootp_pkt { /* BOOTP packet format */ 580 struct iphdr iph; /* IP header */ 581 struct udphdr udph; /* UDP header */ 582 u8 op; /* 1=request, 2=reply */ 583 u8 htype; /* HW address type */ 584 u8 hlen; /* HW address length */ 585 u8 hops; /* Used only by gateways */ 586 __be32 xid; /* Transaction ID */ 587 __be16 secs; /* Seconds since we started */ 588 __be16 flags; /* Just what it says */ 589 __be32 client_ip; /* Client's IP address if known */ 590 __be32 your_ip; /* Assigned IP address */ 591 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 592 __be32 relay_ip; /* IP address of BOOTP relay */ 593 u8 hw_addr[16]; /* Client's HW address */ 594 u8 serv_name[64]; /* Server host name */ 595 u8 boot_file[128]; /* Name of boot file */ 596 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 597 }; 598 599 /* packet ops */ 600 #define BOOTP_REQUEST 1 601 #define BOOTP_REPLY 2 602 603 /* DHCP message types */ 604 #define DHCPDISCOVER 1 605 #define DHCPOFFER 2 606 #define DHCPREQUEST 3 607 #define DHCPDECLINE 4 608 #define DHCPACK 5 609 #define DHCPNAK 6 610 #define DHCPRELEASE 7 611 #define DHCPINFORM 8 612 613 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 614 615 static struct packet_type bootp_packet_type __initdata = { 616 .type = cpu_to_be16(ETH_P_IP), 617 .func = ic_bootp_recv, 618 }; 619 620 621 /* 622 * Initialize DHCP/BOOTP extension fields in the request. 623 */ 624 625 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 626 627 #ifdef IPCONFIG_DHCP 628 629 static void __init 630 ic_dhcp_init_options(u8 *options) 631 { 632 u8 mt = ((ic_servaddr == NONE) 633 ? DHCPDISCOVER : DHCPREQUEST); 634 u8 *e = options; 635 int len; 636 637 #ifdef IPCONFIG_DEBUG 638 printk("DHCP: Sending message type %d\n", mt); 639 #endif 640 641 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 642 e += 4; 643 644 *e++ = 53; /* DHCP message type */ 645 *e++ = 1; 646 *e++ = mt; 647 648 if (mt == DHCPREQUEST) { 649 *e++ = 54; /* Server ID (IP address) */ 650 *e++ = 4; 651 memcpy(e, &ic_servaddr, 4); 652 e += 4; 653 654 *e++ = 50; /* Requested IP address */ 655 *e++ = 4; 656 memcpy(e, &ic_myaddr, 4); 657 e += 4; 658 } 659 660 /* always? */ 661 { 662 static const u8 ic_req_params[] = { 663 1, /* Subnet mask */ 664 3, /* Default gateway */ 665 6, /* DNS server */ 666 12, /* Host name */ 667 15, /* Domain name */ 668 17, /* Boot path */ 669 26, /* MTU */ 670 40, /* NIS domain name */ 671 }; 672 673 *e++ = 55; /* Parameter request list */ 674 *e++ = sizeof(ic_req_params); 675 memcpy(e, ic_req_params, sizeof(ic_req_params)); 676 e += sizeof(ic_req_params); 677 678 if (ic_host_name_set) { 679 *e++ = 12; /* host-name */ 680 len = strlen(utsname()->nodename); 681 *e++ = len; 682 memcpy(e, utsname()->nodename, len); 683 e += len; 684 } 685 if (*vendor_class_identifier) { 686 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n", 687 vendor_class_identifier); 688 *e++ = 60; /* Class-identifier */ 689 len = strlen(vendor_class_identifier); 690 *e++ = len; 691 memcpy(e, vendor_class_identifier, len); 692 e += len; 693 } 694 } 695 696 *e++ = 255; /* End of the list */ 697 } 698 699 #endif /* IPCONFIG_DHCP */ 700 701 static void __init ic_bootp_init_ext(u8 *e) 702 { 703 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 704 e += 4; 705 *e++ = 1; /* Subnet mask request */ 706 *e++ = 4; 707 e += 4; 708 *e++ = 3; /* Default gateway request */ 709 *e++ = 4; 710 e += 4; 711 *e++ = 5; /* Name server request */ 712 *e++ = 8; 713 e += 8; 714 *e++ = 12; /* Host name request */ 715 *e++ = 32; 716 e += 32; 717 *e++ = 40; /* NIS Domain name request */ 718 *e++ = 32; 719 e += 32; 720 *e++ = 17; /* Boot path */ 721 *e++ = 40; 722 e += 40; 723 724 *e++ = 57; /* set extension buffer size for reply */ 725 *e++ = 2; 726 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 727 *e++ = 150; 728 729 *e++ = 255; /* End of the list */ 730 } 731 732 733 /* 734 * Initialize the DHCP/BOOTP mechanism. 735 */ 736 static inline void __init ic_bootp_init(void) 737 { 738 int i; 739 740 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 741 ic_nameservers[i] = NONE; 742 743 dev_add_pack(&bootp_packet_type); 744 } 745 746 747 /* 748 * DHCP/BOOTP cleanup. 749 */ 750 static inline void __init ic_bootp_cleanup(void) 751 { 752 dev_remove_pack(&bootp_packet_type); 753 } 754 755 756 /* 757 * Send DHCP/BOOTP request to single interface. 758 */ 759 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 760 { 761 struct net_device *dev = d->dev; 762 struct sk_buff *skb; 763 struct bootp_pkt *b; 764 struct iphdr *h; 765 766 /* Allocate packet */ 767 skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15, 768 GFP_KERNEL); 769 if (!skb) 770 return; 771 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 772 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 773 memset(b, 0, sizeof(struct bootp_pkt)); 774 775 /* Construct IP header */ 776 skb_reset_network_header(skb); 777 h = ip_hdr(skb); 778 h->version = 4; 779 h->ihl = 5; 780 h->tot_len = htons(sizeof(struct bootp_pkt)); 781 h->frag_off = htons(IP_DF); 782 h->ttl = 64; 783 h->protocol = IPPROTO_UDP; 784 h->daddr = htonl(INADDR_BROADCAST); 785 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 786 787 /* Construct UDP header */ 788 b->udph.source = htons(68); 789 b->udph.dest = htons(67); 790 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 791 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 792 793 /* Construct DHCP/BOOTP header */ 794 b->op = BOOTP_REQUEST; 795 if (dev->type < 256) /* check for false types */ 796 b->htype = dev->type; 797 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ 798 b->htype = ARPHRD_IEEE802; 799 else if (dev->type == ARPHRD_FDDI) 800 b->htype = ARPHRD_ETHER; 801 else { 802 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 803 b->htype = dev->type; /* can cause undefined behavior */ 804 } 805 806 /* server_ip and your_ip address are both already zero per RFC2131 */ 807 b->hlen = dev->addr_len; 808 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 809 b->secs = htons(jiffies_diff / HZ); 810 b->xid = d->xid; 811 812 /* add DHCP options or BOOTP extensions */ 813 #ifdef IPCONFIG_DHCP 814 if (ic_proto_enabled & IC_USE_DHCP) 815 ic_dhcp_init_options(b->exten); 816 else 817 #endif 818 ic_bootp_init_ext(b->exten); 819 820 /* Chain packet down the line... */ 821 skb->dev = dev; 822 skb->protocol = htons(ETH_P_IP); 823 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 824 dev->broadcast, dev->dev_addr, skb->len) < 0 || 825 dev_queue_xmit(skb) < 0) 826 printk("E"); 827 } 828 829 830 /* 831 * Copy BOOTP-supplied string if not already set. 832 */ 833 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 834 { 835 if (!len) 836 return 0; 837 if (len > max-1) 838 len = max-1; 839 memcpy(dest, src, len); 840 dest[len] = '\0'; 841 return 1; 842 } 843 844 845 /* 846 * Process BOOTP extensions. 847 */ 848 static void __init ic_do_bootp_ext(u8 *ext) 849 { 850 u8 servers; 851 int i; 852 u16 mtu; 853 854 #ifdef IPCONFIG_DEBUG 855 u8 *c; 856 857 printk("DHCP/BOOTP: Got extension %d:",*ext); 858 for (c=ext+2; c<ext+2+ext[1]; c++) 859 printk(" %02x", *c); 860 printk("\n"); 861 #endif 862 863 switch (*ext++) { 864 case 1: /* Subnet mask */ 865 if (ic_netmask == NONE) 866 memcpy(&ic_netmask, ext+1, 4); 867 break; 868 case 3: /* Default gateway */ 869 if (ic_gateway == NONE) 870 memcpy(&ic_gateway, ext+1, 4); 871 break; 872 case 6: /* DNS server */ 873 servers= *ext/4; 874 if (servers > CONF_NAMESERVERS_MAX) 875 servers = CONF_NAMESERVERS_MAX; 876 for (i = 0; i < servers; i++) { 877 if (ic_nameservers[i] == NONE) 878 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 879 } 880 break; 881 case 12: /* Host name */ 882 ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN); 883 ic_host_name_set = 1; 884 break; 885 case 15: /* Domain name (DNS) */ 886 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 887 break; 888 case 17: /* Root path */ 889 if (!root_server_path[0]) 890 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path)); 891 break; 892 case 26: /* Interface MTU */ 893 memcpy(&mtu, ext+1, sizeof(mtu)); 894 ic_dev_mtu = ntohs(mtu); 895 break; 896 case 40: /* NIS Domain name (_not_ DNS) */ 897 ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN); 898 break; 899 } 900 } 901 902 903 /* 904 * Receive BOOTP reply. 905 */ 906 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 907 { 908 struct bootp_pkt *b; 909 struct iphdr *h; 910 struct ic_device *d; 911 int len, ext_len; 912 913 if (!net_eq(dev_net(dev), &init_net)) 914 goto drop; 915 916 /* Perform verifications before taking the lock. */ 917 if (skb->pkt_type == PACKET_OTHERHOST) 918 goto drop; 919 920 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 921 return NET_RX_DROP; 922 923 if (!pskb_may_pull(skb, 924 sizeof(struct iphdr) + 925 sizeof(struct udphdr))) 926 goto drop; 927 928 b = (struct bootp_pkt *)skb_network_header(skb); 929 h = &b->iph; 930 931 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 932 goto drop; 933 934 /* Fragments are not supported */ 935 if (h->frag_off & htons(IP_OFFSET | IP_MF)) { 936 if (net_ratelimit()) 937 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " 938 "reply.\n"); 939 goto drop; 940 } 941 942 if (skb->len < ntohs(h->tot_len)) 943 goto drop; 944 945 if (ip_fast_csum((char *) h, h->ihl)) 946 goto drop; 947 948 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 949 goto drop; 950 951 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 952 goto drop; 953 954 len = ntohs(b->udph.len) - sizeof(struct udphdr); 955 ext_len = len - (sizeof(*b) - 956 sizeof(struct iphdr) - 957 sizeof(struct udphdr) - 958 sizeof(b->exten)); 959 if (ext_len < 0) 960 goto drop; 961 962 /* Ok the front looks good, make sure we can get at the rest. */ 963 if (!pskb_may_pull(skb, skb->len)) 964 goto drop; 965 966 b = (struct bootp_pkt *)skb_network_header(skb); 967 h = &b->iph; 968 969 /* One reply at a time, please. */ 970 spin_lock(&ic_recv_lock); 971 972 /* If we already have a reply, just drop the packet */ 973 if (ic_got_reply) 974 goto drop_unlock; 975 976 /* Find the ic_device that the packet arrived on */ 977 d = ic_first_dev; 978 while (d && d->dev != dev) 979 d = d->next; 980 if (!d) 981 goto drop_unlock; /* should never happen */ 982 983 /* Is it a reply to our BOOTP request? */ 984 if (b->op != BOOTP_REPLY || 985 b->xid != d->xid) { 986 if (net_ratelimit()) 987 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " 988 "op[%x] xid[%x]\n", 989 b->op, b->xid); 990 goto drop_unlock; 991 } 992 993 /* Is it a reply for the device we are configuring? */ 994 if (b->xid != ic_dev_xid) { 995 if (net_ratelimit()) 996 printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet\n"); 997 goto drop_unlock; 998 } 999 1000 /* Parse extensions */ 1001 if (ext_len >= 4 && 1002 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1003 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1004 u8 *ext; 1005 1006 #ifdef IPCONFIG_DHCP 1007 if (ic_proto_enabled & IC_USE_DHCP) { 1008 __be32 server_id = NONE; 1009 int mt = 0; 1010 1011 ext = &b->exten[4]; 1012 while (ext < end && *ext != 0xff) { 1013 u8 *opt = ext++; 1014 if (*opt == 0) /* Padding */ 1015 continue; 1016 ext += *ext + 1; 1017 if (ext >= end) 1018 break; 1019 switch (*opt) { 1020 case 53: /* Message type */ 1021 if (opt[1]) 1022 mt = opt[2]; 1023 break; 1024 case 54: /* Server ID (IP address) */ 1025 if (opt[1] >= 4) 1026 memcpy(&server_id, opt + 2, 4); 1027 break; 1028 } 1029 } 1030 1031 #ifdef IPCONFIG_DEBUG 1032 printk("DHCP: Got message type %d\n", mt); 1033 #endif 1034 1035 switch (mt) { 1036 case DHCPOFFER: 1037 /* While in the process of accepting one offer, 1038 * ignore all others. 1039 */ 1040 if (ic_myaddr != NONE) 1041 goto drop_unlock; 1042 1043 /* Let's accept that offer. */ 1044 ic_myaddr = b->your_ip; 1045 ic_servaddr = server_id; 1046 #ifdef IPCONFIG_DEBUG 1047 printk("DHCP: Offered address %pI4 by server %pI4\n", 1048 &ic_myaddr, &ic_servaddr); 1049 #endif 1050 /* The DHCP indicated server address takes 1051 * precedence over the bootp header one if 1052 * they are different. 1053 */ 1054 if ((server_id != NONE) && 1055 (b->server_ip != server_id)) 1056 b->server_ip = ic_servaddr; 1057 break; 1058 1059 case DHCPACK: 1060 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1061 goto drop_unlock; 1062 1063 /* Yeah! */ 1064 break; 1065 1066 default: 1067 /* Urque. Forget it*/ 1068 ic_myaddr = NONE; 1069 ic_servaddr = NONE; 1070 goto drop_unlock; 1071 } 1072 1073 ic_dhcp_msgtype = mt; 1074 1075 } 1076 #endif /* IPCONFIG_DHCP */ 1077 1078 ext = &b->exten[4]; 1079 while (ext < end && *ext != 0xff) { 1080 u8 *opt = ext++; 1081 if (*opt == 0) /* Padding */ 1082 continue; 1083 ext += *ext + 1; 1084 if (ext < end) 1085 ic_do_bootp_ext(opt); 1086 } 1087 } 1088 1089 /* We have a winner! */ 1090 ic_dev = dev; 1091 ic_myaddr = b->your_ip; 1092 ic_servaddr = b->server_ip; 1093 if (ic_gateway == NONE && b->relay_ip) 1094 ic_gateway = b->relay_ip; 1095 if (ic_nameservers[0] == NONE) 1096 ic_nameservers[0] = ic_servaddr; 1097 ic_got_reply = IC_BOOTP; 1098 1099 drop_unlock: 1100 /* Show's over. Nothing to see here. */ 1101 spin_unlock(&ic_recv_lock); 1102 1103 drop: 1104 /* Throw the packet out. */ 1105 kfree_skb(skb); 1106 1107 return 0; 1108 } 1109 1110 1111 #endif 1112 1113 1114 /* 1115 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1116 */ 1117 1118 #ifdef IPCONFIG_DYNAMIC 1119 1120 static int __init ic_dynamic(void) 1121 { 1122 int retries; 1123 struct ic_device *d; 1124 unsigned long start_jiffies, timeout, jiff; 1125 int do_bootp = ic_proto_have_if & IC_BOOTP; 1126 int do_rarp = ic_proto_have_if & IC_RARP; 1127 1128 /* 1129 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1130 * This routine gets only called when some pieces of information 1131 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1132 */ 1133 if (!ic_proto_enabled) { 1134 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1135 return -1; 1136 } 1137 1138 #ifdef IPCONFIG_BOOTP 1139 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1140 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); 1141 #endif 1142 #ifdef IPCONFIG_RARP 1143 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1144 printk(KERN_ERR "RARP: No suitable device found.\n"); 1145 #endif 1146 1147 if (!ic_proto_have_if) 1148 /* Error message already printed */ 1149 return -1; 1150 1151 /* 1152 * Setup protocols 1153 */ 1154 #ifdef IPCONFIG_BOOTP 1155 if (do_bootp) 1156 ic_bootp_init(); 1157 #endif 1158 #ifdef IPCONFIG_RARP 1159 if (do_rarp) 1160 ic_rarp_init(); 1161 #endif 1162 1163 /* 1164 * Send requests and wait, until we get an answer. This loop 1165 * seems to be a terrible waste of CPU time, but actually there is 1166 * only one process running at all, so we don't need to use any 1167 * scheduler functions. 1168 * [Actually we could now, but the nothing else running note still 1169 * applies.. - AC] 1170 */ 1171 printk(KERN_NOTICE "Sending %s%s%s requests .", 1172 do_bootp 1173 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1174 (do_bootp && do_rarp) ? " and " : "", 1175 do_rarp ? "RARP" : ""); 1176 1177 start_jiffies = jiffies; 1178 d = ic_first_dev; 1179 retries = CONF_SEND_RETRIES; 1180 get_random_bytes(&timeout, sizeof(timeout)); 1181 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); 1182 for (;;) { 1183 /* Track the device we are configuring */ 1184 ic_dev_xid = d->xid; 1185 1186 #ifdef IPCONFIG_BOOTP 1187 if (do_bootp && (d->able & IC_BOOTP)) 1188 ic_bootp_send_if(d, jiffies - start_jiffies); 1189 #endif 1190 #ifdef IPCONFIG_RARP 1191 if (do_rarp && (d->able & IC_RARP)) 1192 ic_rarp_send_if(d); 1193 #endif 1194 1195 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1196 while (time_before(jiffies, jiff) && !ic_got_reply) 1197 schedule_timeout_uninterruptible(1); 1198 #ifdef IPCONFIG_DHCP 1199 /* DHCP isn't done until we get a DHCPACK. */ 1200 if ((ic_got_reply & IC_BOOTP) && 1201 (ic_proto_enabled & IC_USE_DHCP) && 1202 ic_dhcp_msgtype != DHCPACK) { 1203 ic_got_reply = 0; 1204 printk(KERN_CONT ","); 1205 continue; 1206 } 1207 #endif /* IPCONFIG_DHCP */ 1208 1209 if (ic_got_reply) { 1210 printk(KERN_CONT " OK\n"); 1211 break; 1212 } 1213 1214 if ((d = d->next)) 1215 continue; 1216 1217 if (! --retries) { 1218 printk(KERN_CONT " timed out!\n"); 1219 break; 1220 } 1221 1222 d = ic_first_dev; 1223 1224 timeout = timeout CONF_TIMEOUT_MULT; 1225 if (timeout > CONF_TIMEOUT_MAX) 1226 timeout = CONF_TIMEOUT_MAX; 1227 1228 printk(KERN_CONT "."); 1229 } 1230 1231 #ifdef IPCONFIG_BOOTP 1232 if (do_bootp) 1233 ic_bootp_cleanup(); 1234 #endif 1235 #ifdef IPCONFIG_RARP 1236 if (do_rarp) 1237 ic_rarp_cleanup(); 1238 #endif 1239 1240 if (!ic_got_reply) { 1241 ic_myaddr = NONE; 1242 return -1; 1243 } 1244 1245 printk("IP-Config: Got %s answer from %pI4, ", 1246 ((ic_got_reply & IC_RARP) ? "RARP" 1247 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1248 &ic_servaddr); 1249 printk(KERN_CONT "my address is %pI4\n", &ic_myaddr); 1250 1251 return 0; 1252 } 1253 1254 #endif /* IPCONFIG_DYNAMIC */ 1255 1256 #ifdef CONFIG_PROC_FS 1257 1258 static int pnp_seq_show(struct seq_file *seq, void *v) 1259 { 1260 int i; 1261 1262 if (ic_proto_used & IC_PROTO) 1263 seq_printf(seq, "#PROTO: %s\n", 1264 (ic_proto_used & IC_RARP) ? "RARP" 1265 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1266 else 1267 seq_puts(seq, "#MANUAL\n"); 1268 1269 if (ic_domain[0]) 1270 seq_printf(seq, 1271 "domain %s\n", ic_domain); 1272 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1273 if (ic_nameservers[i] != NONE) 1274 seq_printf(seq, "nameserver %pI4\n", 1275 &ic_nameservers[i]); 1276 } 1277 if (ic_servaddr != NONE) 1278 seq_printf(seq, "bootserver %pI4\n", 1279 &ic_servaddr); 1280 return 0; 1281 } 1282 1283 static int pnp_seq_open(struct inode *indoe, struct file *file) 1284 { 1285 return single_open(file, pnp_seq_show, NULL); 1286 } 1287 1288 static const struct file_operations pnp_seq_fops = { 1289 .owner = THIS_MODULE, 1290 .open = pnp_seq_open, 1291 .read = seq_read, 1292 .llseek = seq_lseek, 1293 .release = single_release, 1294 }; 1295 #endif /* CONFIG_PROC_FS */ 1296 1297 /* 1298 * Extract IP address from the parameter string if needed. Note that we 1299 * need to have root_server_addr set _before_ IPConfig gets called as it 1300 * can override it. 1301 */ 1302 __be32 __init root_nfs_parse_addr(char *name) 1303 { 1304 __be32 addr; 1305 int octets = 0; 1306 char *cp, *cq; 1307 1308 cp = cq = name; 1309 while (octets < 4) { 1310 while (*cp >= '0' && *cp <= '9') 1311 cp++; 1312 if (cp == cq || cp - cq > 3) 1313 break; 1314 if (*cp == '.' || octets == 3) 1315 octets++; 1316 if (octets < 4) 1317 cp++; 1318 cq = cp; 1319 } 1320 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1321 if (*cp == ':') 1322 *cp++ = '\0'; 1323 addr = in_aton(name); 1324 memmove(name, cp, strlen(cp) + 1); 1325 } else 1326 addr = NONE; 1327 1328 return addr; 1329 } 1330 1331 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1332 1333 static int __init wait_for_devices(void) 1334 { 1335 int i; 1336 1337 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1338 struct net_device *dev; 1339 int found = 0; 1340 1341 rtnl_lock(); 1342 for_each_netdev(&init_net, dev) { 1343 if (ic_is_init_dev(dev)) { 1344 found = 1; 1345 break; 1346 } 1347 } 1348 rtnl_unlock(); 1349 if (found) 1350 return 0; 1351 ssleep(1); 1352 } 1353 return -ENODEV; 1354 } 1355 1356 /* 1357 * IP Autoconfig dispatcher. 1358 */ 1359 1360 static int __init ip_auto_config(void) 1361 { 1362 __be32 addr; 1363 #ifdef IPCONFIG_DYNAMIC 1364 int retries = CONF_OPEN_RETRIES; 1365 #endif 1366 int err; 1367 1368 #ifdef CONFIG_PROC_FS 1369 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops); 1370 #endif /* CONFIG_PROC_FS */ 1371 1372 if (!ic_enable) 1373 return 0; 1374 1375 DBG(("IP-Config: Entered.\n")); 1376 #ifdef IPCONFIG_DYNAMIC 1377 try_try_again: 1378 #endif 1379 /* Wait for devices to appear */ 1380 err = wait_for_devices(); 1381 if (err) 1382 return err; 1383 1384 /* Setup all network devices */ 1385 err = ic_open_devs(); 1386 if (err) 1387 return err; 1388 1389 /* Give drivers a chance to settle */ 1390 msleep(CONF_POST_OPEN); 1391 1392 /* 1393 * If the config information is insufficient (e.g., our IP address or 1394 * IP address of the boot server is missing or we have multiple network 1395 * interfaces and no default was set), use BOOTP or RARP to get the 1396 * missing values. 1397 */ 1398 if (ic_myaddr == NONE || 1399 #ifdef CONFIG_ROOT_NFS 1400 (root_server_addr == NONE && 1401 ic_servaddr == NONE && 1402 ROOT_DEV == Root_NFS) || 1403 #endif 1404 ic_first_dev->next) { 1405 #ifdef IPCONFIG_DYNAMIC 1406 if (ic_dynamic() < 0) { 1407 ic_close_devs(); 1408 1409 /* 1410 * I don't know why, but sometimes the 1411 * eepro100 driver (at least) gets upset and 1412 * doesn't work the first time it's opened. 1413 * But then if you close it and reopen it, it 1414 * works just fine. So we need to try that at 1415 * least once before giving up. 1416 * 1417 * Also, if the root will be NFS-mounted, we 1418 * have nowhere to go if DHCP fails. So we 1419 * just have to keep trying forever. 1420 * 1421 * -- Chip 1422 */ 1423 #ifdef CONFIG_ROOT_NFS 1424 if (ROOT_DEV == Root_NFS) { 1425 printk(KERN_ERR 1426 "IP-Config: Retrying forever (NFS root)...\n"); 1427 goto try_try_again; 1428 } 1429 #endif 1430 1431 if (--retries) { 1432 printk(KERN_ERR 1433 "IP-Config: Reopening network devices...\n"); 1434 goto try_try_again; 1435 } 1436 1437 /* Oh, well. At least we tried. */ 1438 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); 1439 return -1; 1440 } 1441 #else /* !DYNAMIC */ 1442 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1443 ic_close_devs(); 1444 return -1; 1445 #endif /* IPCONFIG_DYNAMIC */ 1446 } else { 1447 /* Device selected manually or only one device -> use it */ 1448 ic_dev = ic_first_dev->dev; 1449 } 1450 1451 addr = root_nfs_parse_addr(root_server_path); 1452 if (root_server_addr == NONE) 1453 root_server_addr = addr; 1454 1455 /* 1456 * Use defaults wherever applicable. 1457 */ 1458 if (ic_defaults() < 0) 1459 return -1; 1460 1461 /* 1462 * Close all network devices except the device we've 1463 * autoconfigured and set up routes. 1464 */ 1465 ic_close_devs(); 1466 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1467 return -1; 1468 1469 /* 1470 * Record which protocol was actually used. 1471 */ 1472 #ifdef IPCONFIG_DYNAMIC 1473 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1474 #endif 1475 1476 #ifndef IPCONFIG_SILENT 1477 /* 1478 * Clue in the operator. 1479 */ 1480 printk("IP-Config: Complete:\n"); 1481 printk(" device=%s", ic_dev->name); 1482 printk(KERN_CONT ", addr=%pI4", &ic_myaddr); 1483 printk(KERN_CONT ", mask=%pI4", &ic_netmask); 1484 printk(KERN_CONT ", gw=%pI4", &ic_gateway); 1485 printk(KERN_CONT ",\n host=%s, domain=%s, nis-domain=%s", 1486 utsname()->nodename, ic_domain, utsname()->domainname); 1487 printk(KERN_CONT ",\n bootserver=%pI4", &ic_servaddr); 1488 printk(KERN_CONT ", rootserver=%pI4", &root_server_addr); 1489 printk(KERN_CONT ", rootpath=%s", root_server_path); 1490 if (ic_dev_mtu) 1491 printk(KERN_CONT ", mtu=%d", ic_dev_mtu); 1492 printk(KERN_CONT "\n"); 1493 #endif /* !SILENT */ 1494 1495 return 0; 1496 } 1497 1498 late_initcall(ip_auto_config); 1499 1500 1501 /* 1502 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1503 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. 1504 */ 1505 static int __init ic_proto_name(char *name) 1506 { 1507 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1508 return 1; 1509 } 1510 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1511 return 0; 1512 } 1513 #ifdef CONFIG_IP_PNP_DHCP 1514 else if (!strcmp(name, "dhcp")) { 1515 ic_proto_enabled &= ~IC_RARP; 1516 return 1; 1517 } 1518 #endif 1519 #ifdef CONFIG_IP_PNP_BOOTP 1520 else if (!strcmp(name, "bootp")) { 1521 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1522 return 1; 1523 } 1524 #endif 1525 #ifdef CONFIG_IP_PNP_RARP 1526 else if (!strcmp(name, "rarp")) { 1527 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1528 return 1; 1529 } 1530 #endif 1531 #ifdef IPCONFIG_DYNAMIC 1532 else if (!strcmp(name, "both")) { 1533 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1534 return 1; 1535 } 1536 #endif 1537 return 0; 1538 } 1539 1540 static int __init ip_auto_config_setup(char *addrs) 1541 { 1542 char *cp, *ip, *dp; 1543 int num = 0; 1544 1545 ic_set_manually = 1; 1546 ic_enable = 1; 1547 1548 /* 1549 * If any dhcp, bootp etc options are set, leave autoconfig on 1550 * and skip the below static IP processing. 1551 */ 1552 if (ic_proto_name(addrs)) 1553 return 1; 1554 1555 /* If no static IP is given, turn off autoconfig and bail. */ 1556 if (*addrs == 0 || 1557 strcmp(addrs, "off") == 0 || 1558 strcmp(addrs, "none") == 0) { 1559 ic_enable = 0; 1560 return 1; 1561 } 1562 1563 /* Parse string for static IP assignment. */ 1564 ip = addrs; 1565 while (ip && *ip) { 1566 if ((cp = strchr(ip, ':'))) 1567 *cp++ = '\0'; 1568 if (strlen(ip) > 0) { 1569 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); 1570 switch (num) { 1571 case 0: 1572 if ((ic_myaddr = in_aton(ip)) == ANY) 1573 ic_myaddr = NONE; 1574 break; 1575 case 1: 1576 if ((ic_servaddr = in_aton(ip)) == ANY) 1577 ic_servaddr = NONE; 1578 break; 1579 case 2: 1580 if ((ic_gateway = in_aton(ip)) == ANY) 1581 ic_gateway = NONE; 1582 break; 1583 case 3: 1584 if ((ic_netmask = in_aton(ip)) == ANY) 1585 ic_netmask = NONE; 1586 break; 1587 case 4: 1588 if ((dp = strchr(ip, '.'))) { 1589 *dp++ = '\0'; 1590 strlcpy(utsname()->domainname, dp, 1591 sizeof(utsname()->domainname)); 1592 } 1593 strlcpy(utsname()->nodename, ip, 1594 sizeof(utsname()->nodename)); 1595 ic_host_name_set = 1; 1596 break; 1597 case 5: 1598 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1599 break; 1600 case 6: 1601 if (ic_proto_name(ip) == 0 && 1602 ic_myaddr == NONE) { 1603 ic_enable = 0; 1604 } 1605 break; 1606 } 1607 } 1608 ip = cp; 1609 num++; 1610 } 1611 1612 return 1; 1613 } 1614 1615 static int __init nfsaddrs_config_setup(char *addrs) 1616 { 1617 return ip_auto_config_setup(addrs); 1618 } 1619 1620 static int __init vendor_class_identifier_setup(char *addrs) 1621 { 1622 if (strlcpy(vendor_class_identifier, addrs, 1623 sizeof(vendor_class_identifier)) 1624 >= sizeof(vendor_class_identifier)) 1625 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"", 1626 vendor_class_identifier); 1627 return 1; 1628 } 1629 1630 __setup("ip=", ip_auto_config_setup); 1631 __setup("nfsaddrs=", nfsaddrs_config_setup); 1632 __setup("dhcpclass=", vendor_class_identifier_setup); 1633