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 <linux/export.h> 58 #include <net/net_namespace.h> 59 #include <net/arp.h> 60 #include <net/ip.h> 61 #include <net/ipconfig.h> 62 #include <net/route.h> 63 64 #include <asm/uaccess.h> 65 #include <net/checksum.h> 66 #include <asm/processor.h> 67 68 /* Define this to allow debugging output */ 69 #undef IPCONFIG_DEBUG 70 71 #ifdef IPCONFIG_DEBUG 72 #define DBG(x) printk x 73 #else 74 #define DBG(x) do { } while(0) 75 #endif 76 77 #if defined(CONFIG_IP_PNP_DHCP) 78 #define IPCONFIG_DHCP 79 #endif 80 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) 81 #define IPCONFIG_BOOTP 82 #endif 83 #if defined(CONFIG_IP_PNP_RARP) 84 #define IPCONFIG_RARP 85 #endif 86 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) 87 #define IPCONFIG_DYNAMIC 88 #endif 89 90 /* Define the friendly delay before and after opening net devices */ 91 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */ 92 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */ 93 94 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ 95 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ 96 #define CONF_SEND_RETRIES 6 /* Send six requests per open */ 97 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */ 98 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ 99 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ 100 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ 101 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ 102 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers 103 - '3' from resolv.h */ 104 105 #define NONE cpu_to_be32(INADDR_NONE) 106 #define ANY cpu_to_be32(INADDR_ANY) 107 108 /* 109 * Public IP configuration 110 */ 111 112 /* This is used by platforms which might be able to set the ipconfig 113 * variables using firmware environment vars. If this is set, it will 114 * ignore such firmware variables. 115 */ 116 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ 117 118 static int ic_enable __initdata = 0; /* IP config enabled? */ 119 120 /* Protocol choice */ 121 int ic_proto_enabled __initdata = 0 122 #ifdef IPCONFIG_BOOTP 123 | IC_BOOTP 124 #endif 125 #ifdef CONFIG_IP_PNP_DHCP 126 | IC_USE_DHCP 127 #endif 128 #ifdef IPCONFIG_RARP 129 | IC_RARP 130 #endif 131 ; 132 133 static int ic_host_name_set __initdata = 0; /* Host name set by us? */ 134 135 __be32 ic_myaddr = NONE; /* My IP address */ 136 static __be32 ic_netmask = NONE; /* Netmask for local subnet */ 137 __be32 ic_gateway = NONE; /* Gateway IP address */ 138 139 __be32 ic_servaddr = NONE; /* Boot server IP address */ 140 141 __be32 root_server_addr = NONE; /* Address of NFS server */ 142 u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 143 144 u32 ic_dev_xid; /* Device under configuration */ 145 146 /* vendor class identifier */ 147 static char vendor_class_identifier[253] __initdata; 148 149 /* Persistent data: */ 150 151 static int ic_proto_used; /* Protocol used, if any */ 152 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 153 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 154 155 /* 156 * Private state. 157 */ 158 159 /* Name of user-selected boot device */ 160 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 161 162 /* Protocols supported by available interfaces */ 163 static int ic_proto_have_if __initdata = 0; 164 165 /* MTU for boot device */ 166 static int ic_dev_mtu __initdata = 0; 167 168 #ifdef IPCONFIG_DYNAMIC 169 static DEFINE_SPINLOCK(ic_recv_lock); 170 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */ 171 #endif 172 #ifdef IPCONFIG_DHCP 173 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */ 174 #endif 175 176 177 /* 178 * Network devices 179 */ 180 181 struct ic_device { 182 struct ic_device *next; 183 struct net_device *dev; 184 unsigned short flags; 185 short able; 186 __be32 xid; 187 }; 188 189 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */ 190 static struct net_device *ic_dev __initdata = NULL; /* Selected device */ 191 192 static bool __init ic_is_init_dev(struct net_device *dev) 193 { 194 if (dev->flags & IFF_LOOPBACK) 195 return false; 196 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 197 (!(dev->flags & IFF_LOOPBACK) && 198 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 199 strncmp(dev->name, "dummy", 5)); 200 } 201 202 static int __init ic_open_devs(void) 203 { 204 struct ic_device *d, **last; 205 struct net_device *dev; 206 unsigned short oflags; 207 unsigned long start; 208 209 last = &ic_first_dev; 210 rtnl_lock(); 211 212 /* bring loopback device up first */ 213 for_each_netdev(&init_net, dev) { 214 if (!(dev->flags & IFF_LOOPBACK)) 215 continue; 216 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) 217 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); 218 } 219 220 for_each_netdev(&init_net, dev) { 221 if (ic_is_init_dev(dev)) { 222 int able = 0; 223 if (dev->mtu >= 364) 224 able |= IC_BOOTP; 225 else 226 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu); 227 if (!(dev->flags & IFF_NOARP)) 228 able |= IC_RARP; 229 able &= ic_proto_enabled; 230 if (ic_proto_enabled && !able) 231 continue; 232 oflags = dev->flags; 233 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 234 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); 235 continue; 236 } 237 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 238 rtnl_unlock(); 239 return -ENOMEM; 240 } 241 d->dev = dev; 242 *last = d; 243 last = &d->next; 244 d->flags = oflags; 245 d->able = able; 246 if (able & IC_BOOTP) 247 get_random_bytes(&d->xid, sizeof(__be32)); 248 else 249 d->xid = 0; 250 ic_proto_have_if |= able; 251 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", 252 dev->name, able, d->xid)); 253 } 254 } 255 256 /* wait for a carrier on at least one device */ 257 start = jiffies; 258 while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) { 259 for_each_netdev(&init_net, dev) 260 if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) 261 goto have_carrier; 262 263 msleep(1); 264 } 265 have_carrier: 266 rtnl_unlock(); 267 268 *last = NULL; 269 270 if (!ic_first_dev) { 271 if (user_dev_name[0]) 272 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name); 273 else 274 printk(KERN_ERR "IP-Config: No network devices available.\n"); 275 return -ENODEV; 276 } 277 return 0; 278 } 279 280 static void __init ic_close_devs(void) 281 { 282 struct ic_device *d, *next; 283 struct net_device *dev; 284 285 rtnl_lock(); 286 next = ic_first_dev; 287 while ((d = next)) { 288 next = d->next; 289 dev = d->dev; 290 if (dev != ic_dev) { 291 DBG(("IP-Config: Downing %s\n", dev->name)); 292 dev_change_flags(dev, d->flags); 293 } 294 kfree(d); 295 } 296 rtnl_unlock(); 297 } 298 299 /* 300 * Interface to various network functions. 301 */ 302 303 static inline void 304 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 305 { 306 sin->sin_family = AF_INET; 307 sin->sin_addr.s_addr = addr; 308 sin->sin_port = port; 309 } 310 311 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg) 312 { 313 int res; 314 315 mm_segment_t oldfs = get_fs(); 316 set_fs(get_ds()); 317 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 318 set_fs(oldfs); 319 return res; 320 } 321 322 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 323 { 324 int res; 325 326 mm_segment_t oldfs = get_fs(); 327 set_fs(get_ds()); 328 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 329 set_fs(oldfs); 330 return res; 331 } 332 333 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 334 { 335 int res; 336 337 mm_segment_t oldfs = get_fs(); 338 set_fs(get_ds()); 339 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); 340 set_fs(oldfs); 341 return res; 342 } 343 344 /* 345 * Set up interface addresses and routes. 346 */ 347 348 static int __init ic_setup_if(void) 349 { 350 struct ifreq ir; 351 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 352 int err; 353 354 memset(&ir, 0, sizeof(ir)); 355 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); 356 set_sockaddr(sin, ic_myaddr, 0); 357 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) { 358 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err); 359 return -1; 360 } 361 set_sockaddr(sin, ic_netmask, 0); 362 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 363 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err); 364 return -1; 365 } 366 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 367 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 368 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err); 369 return -1; 370 } 371 /* Handle the case where we need non-standard MTU on the boot link (a network 372 * using jumbo frames, for instance). If we can't set the mtu, don't error 373 * out, we'll try to muddle along. 374 */ 375 if (ic_dev_mtu != 0) { 376 strcpy(ir.ifr_name, ic_dev->name); 377 ir.ifr_mtu = ic_dev_mtu; 378 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0) 379 printk(KERN_ERR "IP-Config: Unable to set interface mtu to %d (%d).\n", 380 ic_dev_mtu, err); 381 } 382 return 0; 383 } 384 385 static int __init ic_setup_routes(void) 386 { 387 /* No need to setup device routes, only the default route... */ 388 389 if (ic_gateway != NONE) { 390 struct rtentry rm; 391 int err; 392 393 memset(&rm, 0, sizeof(rm)); 394 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 395 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n"); 396 return -1; 397 } 398 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 399 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 400 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 401 rm.rt_flags = RTF_UP | RTF_GATEWAY; 402 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 403 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err); 404 return -1; 405 } 406 } 407 408 return 0; 409 } 410 411 /* 412 * Fill in default values for all missing parameters. 413 */ 414 415 static int __init ic_defaults(void) 416 { 417 /* 418 * At this point we have no userspace running so need not 419 * claim locks on system_utsname 420 */ 421 422 if (!ic_host_name_set) 423 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 424 425 if (root_server_addr == NONE) 426 root_server_addr = ic_servaddr; 427 428 if (ic_netmask == NONE) { 429 if (IN_CLASSA(ntohl(ic_myaddr))) 430 ic_netmask = htonl(IN_CLASSA_NET); 431 else if (IN_CLASSB(ntohl(ic_myaddr))) 432 ic_netmask = htonl(IN_CLASSB_NET); 433 else if (IN_CLASSC(ntohl(ic_myaddr))) 434 ic_netmask = htonl(IN_CLASSC_NET); 435 else { 436 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n", 437 &ic_myaddr); 438 return -1; 439 } 440 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask); 441 } 442 443 return 0; 444 } 445 446 /* 447 * RARP support. 448 */ 449 450 #ifdef IPCONFIG_RARP 451 452 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 453 454 static struct packet_type rarp_packet_type __initdata = { 455 .type = cpu_to_be16(ETH_P_RARP), 456 .func = ic_rarp_recv, 457 }; 458 459 static inline void __init ic_rarp_init(void) 460 { 461 dev_add_pack(&rarp_packet_type); 462 } 463 464 static inline void __init ic_rarp_cleanup(void) 465 { 466 dev_remove_pack(&rarp_packet_type); 467 } 468 469 /* 470 * Process received RARP packet. 471 */ 472 static int __init 473 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 474 { 475 struct arphdr *rarp; 476 unsigned char *rarp_ptr; 477 __be32 sip, tip; 478 unsigned char *sha, *tha; /* s for "source", t for "target" */ 479 struct ic_device *d; 480 481 if (!net_eq(dev_net(dev), &init_net)) 482 goto drop; 483 484 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 485 return NET_RX_DROP; 486 487 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 488 goto drop; 489 490 /* Basic sanity checks can be done without the lock. */ 491 rarp = (struct arphdr *)skb_transport_header(skb); 492 493 /* If this test doesn't pass, it's not IP, or we should 494 * ignore it anyway. 495 */ 496 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 497 goto drop; 498 499 /* If it's not a RARP reply, delete it. */ 500 if (rarp->ar_op != htons(ARPOP_RREPLY)) 501 goto drop; 502 503 /* If it's not Ethernet, delete it. */ 504 if (rarp->ar_pro != htons(ETH_P_IP)) 505 goto drop; 506 507 if (!pskb_may_pull(skb, arp_hdr_len(dev))) 508 goto drop; 509 510 /* OK, it is all there and looks valid, process... */ 511 rarp = (struct arphdr *)skb_transport_header(skb); 512 rarp_ptr = (unsigned char *) (rarp + 1); 513 514 /* One reply at a time, please. */ 515 spin_lock(&ic_recv_lock); 516 517 /* If we already have a reply, just drop the packet */ 518 if (ic_got_reply) 519 goto drop_unlock; 520 521 /* Find the ic_device that the packet arrived on */ 522 d = ic_first_dev; 523 while (d && d->dev != dev) 524 d = d->next; 525 if (!d) 526 goto drop_unlock; /* should never happen */ 527 528 /* Extract variable-width fields */ 529 sha = rarp_ptr; 530 rarp_ptr += dev->addr_len; 531 memcpy(&sip, rarp_ptr, 4); 532 rarp_ptr += 4; 533 tha = rarp_ptr; 534 rarp_ptr += dev->addr_len; 535 memcpy(&tip, rarp_ptr, 4); 536 537 /* Discard packets which are not meant for us. */ 538 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 539 goto drop_unlock; 540 541 /* Discard packets which are not from specified server. */ 542 if (ic_servaddr != NONE && ic_servaddr != sip) 543 goto drop_unlock; 544 545 /* We have a winner! */ 546 ic_dev = dev; 547 if (ic_myaddr == NONE) 548 ic_myaddr = tip; 549 ic_servaddr = sip; 550 ic_got_reply = IC_RARP; 551 552 drop_unlock: 553 /* Show's over. Nothing to see here. */ 554 spin_unlock(&ic_recv_lock); 555 556 drop: 557 /* Throw the packet out. */ 558 kfree_skb(skb); 559 return 0; 560 } 561 562 563 /* 564 * Send RARP request packet over a single interface. 565 */ 566 static void __init ic_rarp_send_if(struct ic_device *d) 567 { 568 struct net_device *dev = d->dev; 569 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 570 dev->dev_addr, dev->dev_addr); 571 } 572 #endif 573 574 /* 575 * DHCP/BOOTP support. 576 */ 577 578 #ifdef IPCONFIG_BOOTP 579 580 struct bootp_pkt { /* BOOTP packet format */ 581 struct iphdr iph; /* IP header */ 582 struct udphdr udph; /* UDP header */ 583 u8 op; /* 1=request, 2=reply */ 584 u8 htype; /* HW address type */ 585 u8 hlen; /* HW address length */ 586 u8 hops; /* Used only by gateways */ 587 __be32 xid; /* Transaction ID */ 588 __be16 secs; /* Seconds since we started */ 589 __be16 flags; /* Just what it says */ 590 __be32 client_ip; /* Client's IP address if known */ 591 __be32 your_ip; /* Assigned IP address */ 592 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 593 __be32 relay_ip; /* IP address of BOOTP relay */ 594 u8 hw_addr[16]; /* Client's HW address */ 595 u8 serv_name[64]; /* Server host name */ 596 u8 boot_file[128]; /* Name of boot file */ 597 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 598 }; 599 600 /* packet ops */ 601 #define BOOTP_REQUEST 1 602 #define BOOTP_REPLY 2 603 604 /* DHCP message types */ 605 #define DHCPDISCOVER 1 606 #define DHCPOFFER 2 607 #define DHCPREQUEST 3 608 #define DHCPDECLINE 4 609 #define DHCPACK 5 610 #define DHCPNAK 6 611 #define DHCPRELEASE 7 612 #define DHCPINFORM 8 613 614 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 615 616 static struct packet_type bootp_packet_type __initdata = { 617 .type = cpu_to_be16(ETH_P_IP), 618 .func = ic_bootp_recv, 619 }; 620 621 622 /* 623 * Initialize DHCP/BOOTP extension fields in the request. 624 */ 625 626 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 627 628 #ifdef IPCONFIG_DHCP 629 630 static void __init 631 ic_dhcp_init_options(u8 *options) 632 { 633 u8 mt = ((ic_servaddr == NONE) 634 ? DHCPDISCOVER : DHCPREQUEST); 635 u8 *e = options; 636 int len; 637 638 #ifdef IPCONFIG_DEBUG 639 printk("DHCP: Sending message type %d\n", mt); 640 #endif 641 642 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 643 e += 4; 644 645 *e++ = 53; /* DHCP message type */ 646 *e++ = 1; 647 *e++ = mt; 648 649 if (mt == DHCPREQUEST) { 650 *e++ = 54; /* Server ID (IP address) */ 651 *e++ = 4; 652 memcpy(e, &ic_servaddr, 4); 653 e += 4; 654 655 *e++ = 50; /* Requested IP address */ 656 *e++ = 4; 657 memcpy(e, &ic_myaddr, 4); 658 e += 4; 659 } 660 661 /* always? */ 662 { 663 static const u8 ic_req_params[] = { 664 1, /* Subnet mask */ 665 3, /* Default gateway */ 666 6, /* DNS server */ 667 12, /* Host name */ 668 15, /* Domain name */ 669 17, /* Boot path */ 670 26, /* MTU */ 671 40, /* NIS domain name */ 672 }; 673 674 *e++ = 55; /* Parameter request list */ 675 *e++ = sizeof(ic_req_params); 676 memcpy(e, ic_req_params, sizeof(ic_req_params)); 677 e += sizeof(ic_req_params); 678 679 if (ic_host_name_set) { 680 *e++ = 12; /* host-name */ 681 len = strlen(utsname()->nodename); 682 *e++ = len; 683 memcpy(e, utsname()->nodename, len); 684 e += len; 685 } 686 if (*vendor_class_identifier) { 687 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n", 688 vendor_class_identifier); 689 *e++ = 60; /* Class-identifier */ 690 len = strlen(vendor_class_identifier); 691 *e++ = len; 692 memcpy(e, vendor_class_identifier, len); 693 e += len; 694 } 695 } 696 697 *e++ = 255; /* End of the list */ 698 } 699 700 #endif /* IPCONFIG_DHCP */ 701 702 static void __init ic_bootp_init_ext(u8 *e) 703 { 704 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 705 e += 4; 706 *e++ = 1; /* Subnet mask request */ 707 *e++ = 4; 708 e += 4; 709 *e++ = 3; /* Default gateway request */ 710 *e++ = 4; 711 e += 4; 712 *e++ = 5; /* Name server request */ 713 *e++ = 8; 714 e += 8; 715 *e++ = 12; /* Host name request */ 716 *e++ = 32; 717 e += 32; 718 *e++ = 40; /* NIS Domain name request */ 719 *e++ = 32; 720 e += 32; 721 *e++ = 17; /* Boot path */ 722 *e++ = 40; 723 e += 40; 724 725 *e++ = 57; /* set extension buffer size for reply */ 726 *e++ = 2; 727 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 728 *e++ = 150; 729 730 *e++ = 255; /* End of the list */ 731 } 732 733 734 /* 735 * Initialize the DHCP/BOOTP mechanism. 736 */ 737 static inline void __init ic_bootp_init(void) 738 { 739 int i; 740 741 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 742 ic_nameservers[i] = NONE; 743 744 dev_add_pack(&bootp_packet_type); 745 } 746 747 748 /* 749 * DHCP/BOOTP cleanup. 750 */ 751 static inline void __init ic_bootp_cleanup(void) 752 { 753 dev_remove_pack(&bootp_packet_type); 754 } 755 756 757 /* 758 * Send DHCP/BOOTP request to single interface. 759 */ 760 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 761 { 762 struct net_device *dev = d->dev; 763 struct sk_buff *skb; 764 struct bootp_pkt *b; 765 struct iphdr *h; 766 int hlen = LL_RESERVED_SPACE(dev); 767 int tlen = dev->needed_tailroom; 768 769 /* Allocate packet */ 770 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, 771 GFP_KERNEL); 772 if (!skb) 773 return; 774 skb_reserve(skb, hlen); 775 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 776 memset(b, 0, sizeof(struct bootp_pkt)); 777 778 /* Construct IP header */ 779 skb_reset_network_header(skb); 780 h = ip_hdr(skb); 781 h->version = 4; 782 h->ihl = 5; 783 h->tot_len = htons(sizeof(struct bootp_pkt)); 784 h->frag_off = htons(IP_DF); 785 h->ttl = 64; 786 h->protocol = IPPROTO_UDP; 787 h->daddr = htonl(INADDR_BROADCAST); 788 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 789 790 /* Construct UDP header */ 791 b->udph.source = htons(68); 792 b->udph.dest = htons(67); 793 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 794 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 795 796 /* Construct DHCP/BOOTP header */ 797 b->op = BOOTP_REQUEST; 798 if (dev->type < 256) /* check for false types */ 799 b->htype = dev->type; 800 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ 801 b->htype = ARPHRD_IEEE802; 802 else if (dev->type == ARPHRD_FDDI) 803 b->htype = ARPHRD_ETHER; 804 else { 805 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 806 b->htype = dev->type; /* can cause undefined behavior */ 807 } 808 809 /* server_ip and your_ip address are both already zero per RFC2131 */ 810 b->hlen = dev->addr_len; 811 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 812 b->secs = htons(jiffies_diff / HZ); 813 b->xid = d->xid; 814 815 /* add DHCP options or BOOTP extensions */ 816 #ifdef IPCONFIG_DHCP 817 if (ic_proto_enabled & IC_USE_DHCP) 818 ic_dhcp_init_options(b->exten); 819 else 820 #endif 821 ic_bootp_init_ext(b->exten); 822 823 /* Chain packet down the line... */ 824 skb->dev = dev; 825 skb->protocol = htons(ETH_P_IP); 826 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 827 dev->broadcast, dev->dev_addr, skb->len) < 0) { 828 kfree_skb(skb); 829 printk("E"); 830 return; 831 } 832 833 if (dev_queue_xmit(skb) < 0) 834 printk("E"); 835 } 836 837 838 /* 839 * Copy BOOTP-supplied string if not already set. 840 */ 841 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 842 { 843 if (!len) 844 return 0; 845 if (len > max-1) 846 len = max-1; 847 memcpy(dest, src, len); 848 dest[len] = '\0'; 849 return 1; 850 } 851 852 853 /* 854 * Process BOOTP extensions. 855 */ 856 static void __init ic_do_bootp_ext(u8 *ext) 857 { 858 u8 servers; 859 int i; 860 u16 mtu; 861 862 #ifdef IPCONFIG_DEBUG 863 u8 *c; 864 865 printk("DHCP/BOOTP: Got extension %d:",*ext); 866 for (c=ext+2; c<ext+2+ext[1]; c++) 867 printk(" %02x", *c); 868 printk("\n"); 869 #endif 870 871 switch (*ext++) { 872 case 1: /* Subnet mask */ 873 if (ic_netmask == NONE) 874 memcpy(&ic_netmask, ext+1, 4); 875 break; 876 case 3: /* Default gateway */ 877 if (ic_gateway == NONE) 878 memcpy(&ic_gateway, ext+1, 4); 879 break; 880 case 6: /* DNS server */ 881 servers= *ext/4; 882 if (servers > CONF_NAMESERVERS_MAX) 883 servers = CONF_NAMESERVERS_MAX; 884 for (i = 0; i < servers; i++) { 885 if (ic_nameservers[i] == NONE) 886 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 887 } 888 break; 889 case 12: /* Host name */ 890 ic_bootp_string(utsname()->nodename, ext+1, *ext, 891 __NEW_UTS_LEN); 892 ic_host_name_set = 1; 893 break; 894 case 15: /* Domain name (DNS) */ 895 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 896 break; 897 case 17: /* Root path */ 898 if (!root_server_path[0]) 899 ic_bootp_string(root_server_path, ext+1, *ext, 900 sizeof(root_server_path)); 901 break; 902 case 26: /* Interface MTU */ 903 memcpy(&mtu, ext+1, sizeof(mtu)); 904 ic_dev_mtu = ntohs(mtu); 905 break; 906 case 40: /* NIS Domain name (_not_ DNS) */ 907 ic_bootp_string(utsname()->domainname, ext+1, *ext, 908 __NEW_UTS_LEN); 909 break; 910 } 911 } 912 913 914 /* 915 * Receive BOOTP reply. 916 */ 917 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 918 { 919 struct bootp_pkt *b; 920 struct iphdr *h; 921 struct ic_device *d; 922 int len, ext_len; 923 924 if (!net_eq(dev_net(dev), &init_net)) 925 goto drop; 926 927 /* Perform verifications before taking the lock. */ 928 if (skb->pkt_type == PACKET_OTHERHOST) 929 goto drop; 930 931 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 932 return NET_RX_DROP; 933 934 if (!pskb_may_pull(skb, 935 sizeof(struct iphdr) + 936 sizeof(struct udphdr))) 937 goto drop; 938 939 b = (struct bootp_pkt *)skb_network_header(skb); 940 h = &b->iph; 941 942 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 943 goto drop; 944 945 /* Fragments are not supported */ 946 if (ip_is_fragment(h)) { 947 if (net_ratelimit()) 948 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " 949 "reply.\n"); 950 goto drop; 951 } 952 953 if (skb->len < ntohs(h->tot_len)) 954 goto drop; 955 956 if (ip_fast_csum((char *) h, h->ihl)) 957 goto drop; 958 959 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 960 goto drop; 961 962 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 963 goto drop; 964 965 len = ntohs(b->udph.len) - sizeof(struct udphdr); 966 ext_len = len - (sizeof(*b) - 967 sizeof(struct iphdr) - 968 sizeof(struct udphdr) - 969 sizeof(b->exten)); 970 if (ext_len < 0) 971 goto drop; 972 973 /* Ok the front looks good, make sure we can get at the rest. */ 974 if (!pskb_may_pull(skb, skb->len)) 975 goto drop; 976 977 b = (struct bootp_pkt *)skb_network_header(skb); 978 h = &b->iph; 979 980 /* One reply at a time, please. */ 981 spin_lock(&ic_recv_lock); 982 983 /* If we already have a reply, just drop the packet */ 984 if (ic_got_reply) 985 goto drop_unlock; 986 987 /* Find the ic_device that the packet arrived on */ 988 d = ic_first_dev; 989 while (d && d->dev != dev) 990 d = d->next; 991 if (!d) 992 goto drop_unlock; /* should never happen */ 993 994 /* Is it a reply to our BOOTP request? */ 995 if (b->op != BOOTP_REPLY || 996 b->xid != d->xid) { 997 if (net_ratelimit()) 998 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " 999 "op[%x] xid[%x]\n", 1000 b->op, b->xid); 1001 goto drop_unlock; 1002 } 1003 1004 /* Is it a reply for the device we are configuring? */ 1005 if (b->xid != ic_dev_xid) { 1006 if (net_ratelimit()) 1007 printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet\n"); 1008 goto drop_unlock; 1009 } 1010 1011 /* Parse extensions */ 1012 if (ext_len >= 4 && 1013 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1014 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1015 u8 *ext; 1016 1017 #ifdef IPCONFIG_DHCP 1018 if (ic_proto_enabled & IC_USE_DHCP) { 1019 __be32 server_id = NONE; 1020 int mt = 0; 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 break; 1030 switch (*opt) { 1031 case 53: /* Message type */ 1032 if (opt[1]) 1033 mt = opt[2]; 1034 break; 1035 case 54: /* Server ID (IP address) */ 1036 if (opt[1] >= 4) 1037 memcpy(&server_id, opt + 2, 4); 1038 break; 1039 } 1040 } 1041 1042 #ifdef IPCONFIG_DEBUG 1043 printk("DHCP: Got message type %d\n", mt); 1044 #endif 1045 1046 switch (mt) { 1047 case DHCPOFFER: 1048 /* While in the process of accepting one offer, 1049 * ignore all others. 1050 */ 1051 if (ic_myaddr != NONE) 1052 goto drop_unlock; 1053 1054 /* Let's accept that offer. */ 1055 ic_myaddr = b->your_ip; 1056 ic_servaddr = server_id; 1057 #ifdef IPCONFIG_DEBUG 1058 printk("DHCP: Offered address %pI4 by server %pI4\n", 1059 &ic_myaddr, &ic_servaddr); 1060 #endif 1061 /* The DHCP indicated server address takes 1062 * precedence over the bootp header one if 1063 * they are different. 1064 */ 1065 if ((server_id != NONE) && 1066 (b->server_ip != server_id)) 1067 b->server_ip = ic_servaddr; 1068 break; 1069 1070 case DHCPACK: 1071 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1072 goto drop_unlock; 1073 1074 /* Yeah! */ 1075 break; 1076 1077 default: 1078 /* Urque. Forget it*/ 1079 ic_myaddr = NONE; 1080 ic_servaddr = NONE; 1081 goto drop_unlock; 1082 } 1083 1084 ic_dhcp_msgtype = mt; 1085 1086 } 1087 #endif /* IPCONFIG_DHCP */ 1088 1089 ext = &b->exten[4]; 1090 while (ext < end && *ext != 0xff) { 1091 u8 *opt = ext++; 1092 if (*opt == 0) /* Padding */ 1093 continue; 1094 ext += *ext + 1; 1095 if (ext < end) 1096 ic_do_bootp_ext(opt); 1097 } 1098 } 1099 1100 /* We have a winner! */ 1101 ic_dev = dev; 1102 ic_myaddr = b->your_ip; 1103 ic_servaddr = b->server_ip; 1104 if (ic_gateway == NONE && b->relay_ip) 1105 ic_gateway = b->relay_ip; 1106 if (ic_nameservers[0] == NONE) 1107 ic_nameservers[0] = ic_servaddr; 1108 ic_got_reply = IC_BOOTP; 1109 1110 drop_unlock: 1111 /* Show's over. Nothing to see here. */ 1112 spin_unlock(&ic_recv_lock); 1113 1114 drop: 1115 /* Throw the packet out. */ 1116 kfree_skb(skb); 1117 1118 return 0; 1119 } 1120 1121 1122 #endif 1123 1124 1125 /* 1126 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1127 */ 1128 1129 #ifdef IPCONFIG_DYNAMIC 1130 1131 static int __init ic_dynamic(void) 1132 { 1133 int retries; 1134 struct ic_device *d; 1135 unsigned long start_jiffies, timeout, jiff; 1136 int do_bootp = ic_proto_have_if & IC_BOOTP; 1137 int do_rarp = ic_proto_have_if & IC_RARP; 1138 1139 /* 1140 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1141 * This routine gets only called when some pieces of information 1142 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1143 */ 1144 if (!ic_proto_enabled) { 1145 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1146 return -1; 1147 } 1148 1149 #ifdef IPCONFIG_BOOTP 1150 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1151 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); 1152 #endif 1153 #ifdef IPCONFIG_RARP 1154 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1155 printk(KERN_ERR "RARP: No suitable device found.\n"); 1156 #endif 1157 1158 if (!ic_proto_have_if) 1159 /* Error message already printed */ 1160 return -1; 1161 1162 /* 1163 * Setup protocols 1164 */ 1165 #ifdef IPCONFIG_BOOTP 1166 if (do_bootp) 1167 ic_bootp_init(); 1168 #endif 1169 #ifdef IPCONFIG_RARP 1170 if (do_rarp) 1171 ic_rarp_init(); 1172 #endif 1173 1174 /* 1175 * Send requests and wait, until we get an answer. This loop 1176 * seems to be a terrible waste of CPU time, but actually there is 1177 * only one process running at all, so we don't need to use any 1178 * scheduler functions. 1179 * [Actually we could now, but the nothing else running note still 1180 * applies.. - AC] 1181 */ 1182 printk(KERN_NOTICE "Sending %s%s%s requests .", 1183 do_bootp 1184 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1185 (do_bootp && do_rarp) ? " and " : "", 1186 do_rarp ? "RARP" : ""); 1187 1188 start_jiffies = jiffies; 1189 d = ic_first_dev; 1190 retries = CONF_SEND_RETRIES; 1191 get_random_bytes(&timeout, sizeof(timeout)); 1192 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); 1193 for (;;) { 1194 /* Track the device we are configuring */ 1195 ic_dev_xid = d->xid; 1196 1197 #ifdef IPCONFIG_BOOTP 1198 if (do_bootp && (d->able & IC_BOOTP)) 1199 ic_bootp_send_if(d, jiffies - start_jiffies); 1200 #endif 1201 #ifdef IPCONFIG_RARP 1202 if (do_rarp && (d->able & IC_RARP)) 1203 ic_rarp_send_if(d); 1204 #endif 1205 1206 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1207 while (time_before(jiffies, jiff) && !ic_got_reply) 1208 schedule_timeout_uninterruptible(1); 1209 #ifdef IPCONFIG_DHCP 1210 /* DHCP isn't done until we get a DHCPACK. */ 1211 if ((ic_got_reply & IC_BOOTP) && 1212 (ic_proto_enabled & IC_USE_DHCP) && 1213 ic_dhcp_msgtype != DHCPACK) { 1214 ic_got_reply = 0; 1215 printk(KERN_CONT ","); 1216 continue; 1217 } 1218 #endif /* IPCONFIG_DHCP */ 1219 1220 if (ic_got_reply) { 1221 printk(KERN_CONT " OK\n"); 1222 break; 1223 } 1224 1225 if ((d = d->next)) 1226 continue; 1227 1228 if (! --retries) { 1229 printk(KERN_CONT " timed out!\n"); 1230 break; 1231 } 1232 1233 d = ic_first_dev; 1234 1235 timeout = timeout CONF_TIMEOUT_MULT; 1236 if (timeout > CONF_TIMEOUT_MAX) 1237 timeout = CONF_TIMEOUT_MAX; 1238 1239 printk(KERN_CONT "."); 1240 } 1241 1242 #ifdef IPCONFIG_BOOTP 1243 if (do_bootp) 1244 ic_bootp_cleanup(); 1245 #endif 1246 #ifdef IPCONFIG_RARP 1247 if (do_rarp) 1248 ic_rarp_cleanup(); 1249 #endif 1250 1251 if (!ic_got_reply) { 1252 ic_myaddr = NONE; 1253 return -1; 1254 } 1255 1256 printk("IP-Config: Got %s answer from %pI4, ", 1257 ((ic_got_reply & IC_RARP) ? "RARP" 1258 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1259 &ic_servaddr); 1260 printk(KERN_CONT "my address is %pI4\n", &ic_myaddr); 1261 1262 return 0; 1263 } 1264 1265 #endif /* IPCONFIG_DYNAMIC */ 1266 1267 #ifdef CONFIG_PROC_FS 1268 1269 static int pnp_seq_show(struct seq_file *seq, void *v) 1270 { 1271 int i; 1272 1273 if (ic_proto_used & IC_PROTO) 1274 seq_printf(seq, "#PROTO: %s\n", 1275 (ic_proto_used & IC_RARP) ? "RARP" 1276 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1277 else 1278 seq_puts(seq, "#MANUAL\n"); 1279 1280 if (ic_domain[0]) 1281 seq_printf(seq, 1282 "domain %s\n", ic_domain); 1283 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1284 if (ic_nameservers[i] != NONE) 1285 seq_printf(seq, "nameserver %pI4\n", 1286 &ic_nameservers[i]); 1287 } 1288 if (ic_servaddr != NONE) 1289 seq_printf(seq, "bootserver %pI4\n", 1290 &ic_servaddr); 1291 return 0; 1292 } 1293 1294 static int pnp_seq_open(struct inode *indoe, struct file *file) 1295 { 1296 return single_open(file, pnp_seq_show, NULL); 1297 } 1298 1299 static const struct file_operations pnp_seq_fops = { 1300 .owner = THIS_MODULE, 1301 .open = pnp_seq_open, 1302 .read = seq_read, 1303 .llseek = seq_lseek, 1304 .release = single_release, 1305 }; 1306 #endif /* CONFIG_PROC_FS */ 1307 1308 /* 1309 * Extract IP address from the parameter string if needed. Note that we 1310 * need to have root_server_addr set _before_ IPConfig gets called as it 1311 * can override it. 1312 */ 1313 __be32 __init root_nfs_parse_addr(char *name) 1314 { 1315 __be32 addr; 1316 int octets = 0; 1317 char *cp, *cq; 1318 1319 cp = cq = name; 1320 while (octets < 4) { 1321 while (*cp >= '0' && *cp <= '9') 1322 cp++; 1323 if (cp == cq || cp - cq > 3) 1324 break; 1325 if (*cp == '.' || octets == 3) 1326 octets++; 1327 if (octets < 4) 1328 cp++; 1329 cq = cp; 1330 } 1331 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1332 if (*cp == ':') 1333 *cp++ = '\0'; 1334 addr = in_aton(name); 1335 memmove(name, cp, strlen(cp) + 1); 1336 } else 1337 addr = NONE; 1338 1339 return addr; 1340 } 1341 1342 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1343 1344 static int __init wait_for_devices(void) 1345 { 1346 int i; 1347 1348 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1349 struct net_device *dev; 1350 int found = 0; 1351 1352 rtnl_lock(); 1353 for_each_netdev(&init_net, dev) { 1354 if (ic_is_init_dev(dev)) { 1355 found = 1; 1356 break; 1357 } 1358 } 1359 rtnl_unlock(); 1360 if (found) 1361 return 0; 1362 ssleep(1); 1363 } 1364 return -ENODEV; 1365 } 1366 1367 /* 1368 * IP Autoconfig dispatcher. 1369 */ 1370 1371 static int __init ip_auto_config(void) 1372 { 1373 __be32 addr; 1374 #ifdef IPCONFIG_DYNAMIC 1375 int retries = CONF_OPEN_RETRIES; 1376 #endif 1377 int err; 1378 1379 #ifdef CONFIG_PROC_FS 1380 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops); 1381 #endif /* CONFIG_PROC_FS */ 1382 1383 if (!ic_enable) 1384 return 0; 1385 1386 DBG(("IP-Config: Entered.\n")); 1387 #ifdef IPCONFIG_DYNAMIC 1388 try_try_again: 1389 #endif 1390 /* Wait for devices to appear */ 1391 err = wait_for_devices(); 1392 if (err) 1393 return err; 1394 1395 /* Setup all network devices */ 1396 err = ic_open_devs(); 1397 if (err) 1398 return err; 1399 1400 /* Give drivers a chance to settle */ 1401 msleep(CONF_POST_OPEN); 1402 1403 /* 1404 * If the config information is insufficient (e.g., our IP address or 1405 * IP address of the boot server is missing or we have multiple network 1406 * interfaces and no default was set), use BOOTP or RARP to get the 1407 * missing values. 1408 */ 1409 if (ic_myaddr == NONE || 1410 #ifdef CONFIG_ROOT_NFS 1411 (root_server_addr == NONE && 1412 ic_servaddr == NONE && 1413 ROOT_DEV == Root_NFS) || 1414 #endif 1415 ic_first_dev->next) { 1416 #ifdef IPCONFIG_DYNAMIC 1417 if (ic_dynamic() < 0) { 1418 ic_close_devs(); 1419 1420 /* 1421 * I don't know why, but sometimes the 1422 * eepro100 driver (at least) gets upset and 1423 * doesn't work the first time it's opened. 1424 * But then if you close it and reopen it, it 1425 * works just fine. So we need to try that at 1426 * least once before giving up. 1427 * 1428 * Also, if the root will be NFS-mounted, we 1429 * have nowhere to go if DHCP fails. So we 1430 * just have to keep trying forever. 1431 * 1432 * -- Chip 1433 */ 1434 #ifdef CONFIG_ROOT_NFS 1435 if (ROOT_DEV == Root_NFS) { 1436 printk(KERN_ERR 1437 "IP-Config: Retrying forever (NFS root)...\n"); 1438 goto try_try_again; 1439 } 1440 #endif 1441 1442 if (--retries) { 1443 printk(KERN_ERR 1444 "IP-Config: Reopening network devices...\n"); 1445 goto try_try_again; 1446 } 1447 1448 /* Oh, well. At least we tried. */ 1449 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); 1450 return -1; 1451 } 1452 #else /* !DYNAMIC */ 1453 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1454 ic_close_devs(); 1455 return -1; 1456 #endif /* IPCONFIG_DYNAMIC */ 1457 } else { 1458 /* Device selected manually or only one device -> use it */ 1459 ic_dev = ic_first_dev->dev; 1460 } 1461 1462 addr = root_nfs_parse_addr(root_server_path); 1463 if (root_server_addr == NONE) 1464 root_server_addr = addr; 1465 1466 /* 1467 * Use defaults wherever applicable. 1468 */ 1469 if (ic_defaults() < 0) 1470 return -1; 1471 1472 /* 1473 * Close all network devices except the device we've 1474 * autoconfigured and set up routes. 1475 */ 1476 ic_close_devs(); 1477 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1478 return -1; 1479 1480 /* 1481 * Record which protocol was actually used. 1482 */ 1483 #ifdef IPCONFIG_DYNAMIC 1484 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1485 #endif 1486 1487 #ifndef IPCONFIG_SILENT 1488 /* 1489 * Clue in the operator. 1490 */ 1491 printk("IP-Config: Complete:\n"); 1492 printk(" device=%s", ic_dev->name); 1493 printk(KERN_CONT ", addr=%pI4", &ic_myaddr); 1494 printk(KERN_CONT ", mask=%pI4", &ic_netmask); 1495 printk(KERN_CONT ", gw=%pI4", &ic_gateway); 1496 printk(KERN_CONT ",\n host=%s, domain=%s, nis-domain=%s", 1497 utsname()->nodename, ic_domain, utsname()->domainname); 1498 printk(KERN_CONT ",\n bootserver=%pI4", &ic_servaddr); 1499 printk(KERN_CONT ", rootserver=%pI4", &root_server_addr); 1500 printk(KERN_CONT ", rootpath=%s", root_server_path); 1501 if (ic_dev_mtu) 1502 printk(KERN_CONT ", mtu=%d", ic_dev_mtu); 1503 printk(KERN_CONT "\n"); 1504 #endif /* !SILENT */ 1505 1506 return 0; 1507 } 1508 1509 late_initcall(ip_auto_config); 1510 1511 1512 /* 1513 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1514 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. 1515 */ 1516 static int __init ic_proto_name(char *name) 1517 { 1518 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1519 return 1; 1520 } 1521 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1522 return 0; 1523 } 1524 #ifdef CONFIG_IP_PNP_DHCP 1525 else if (!strcmp(name, "dhcp")) { 1526 ic_proto_enabled &= ~IC_RARP; 1527 return 1; 1528 } 1529 #endif 1530 #ifdef CONFIG_IP_PNP_BOOTP 1531 else if (!strcmp(name, "bootp")) { 1532 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1533 return 1; 1534 } 1535 #endif 1536 #ifdef CONFIG_IP_PNP_RARP 1537 else if (!strcmp(name, "rarp")) { 1538 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1539 return 1; 1540 } 1541 #endif 1542 #ifdef IPCONFIG_DYNAMIC 1543 else if (!strcmp(name, "both")) { 1544 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1545 return 1; 1546 } 1547 #endif 1548 return 0; 1549 } 1550 1551 static int __init ip_auto_config_setup(char *addrs) 1552 { 1553 char *cp, *ip, *dp; 1554 int num = 0; 1555 1556 ic_set_manually = 1; 1557 ic_enable = 1; 1558 1559 /* 1560 * If any dhcp, bootp etc options are set, leave autoconfig on 1561 * and skip the below static IP processing. 1562 */ 1563 if (ic_proto_name(addrs)) 1564 return 1; 1565 1566 /* If no static IP is given, turn off autoconfig and bail. */ 1567 if (*addrs == 0 || 1568 strcmp(addrs, "off") == 0 || 1569 strcmp(addrs, "none") == 0) { 1570 ic_enable = 0; 1571 return 1; 1572 } 1573 1574 /* Parse string for static IP assignment. */ 1575 ip = addrs; 1576 while (ip && *ip) { 1577 if ((cp = strchr(ip, ':'))) 1578 *cp++ = '\0'; 1579 if (strlen(ip) > 0) { 1580 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); 1581 switch (num) { 1582 case 0: 1583 if ((ic_myaddr = in_aton(ip)) == ANY) 1584 ic_myaddr = NONE; 1585 break; 1586 case 1: 1587 if ((ic_servaddr = in_aton(ip)) == ANY) 1588 ic_servaddr = NONE; 1589 break; 1590 case 2: 1591 if ((ic_gateway = in_aton(ip)) == ANY) 1592 ic_gateway = NONE; 1593 break; 1594 case 3: 1595 if ((ic_netmask = in_aton(ip)) == ANY) 1596 ic_netmask = NONE; 1597 break; 1598 case 4: 1599 if ((dp = strchr(ip, '.'))) { 1600 *dp++ = '\0'; 1601 strlcpy(utsname()->domainname, dp, 1602 sizeof(utsname()->domainname)); 1603 } 1604 strlcpy(utsname()->nodename, ip, 1605 sizeof(utsname()->nodename)); 1606 ic_host_name_set = 1; 1607 break; 1608 case 5: 1609 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1610 break; 1611 case 6: 1612 if (ic_proto_name(ip) == 0 && 1613 ic_myaddr == NONE) { 1614 ic_enable = 0; 1615 } 1616 break; 1617 } 1618 } 1619 ip = cp; 1620 num++; 1621 } 1622 1623 return 1; 1624 } 1625 1626 static int __init nfsaddrs_config_setup(char *addrs) 1627 { 1628 return ip_auto_config_setup(addrs); 1629 } 1630 1631 static int __init vendor_class_identifier_setup(char *addrs) 1632 { 1633 if (strlcpy(vendor_class_identifier, addrs, 1634 sizeof(vendor_class_identifier)) 1635 >= sizeof(vendor_class_identifier)) 1636 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"", 1637 vendor_class_identifier); 1638 return 1; 1639 } 1640 1641 __setup("ip=", ip_auto_config_setup); 1642 __setup("nfsaddrs=", nfsaddrs_config_setup); 1643 __setup("dhcpclass=", vendor_class_identifier_setup); 1644