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 __be32 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 /* no point in waiting if we could not bring up at least one device */ 257 if (!ic_first_dev) 258 goto have_carrier; 259 260 /* wait for a carrier on at least one device */ 261 start = jiffies; 262 while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) { 263 for_each_netdev(&init_net, dev) 264 if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) 265 goto have_carrier; 266 267 msleep(1); 268 } 269 have_carrier: 270 rtnl_unlock(); 271 272 *last = NULL; 273 274 if (!ic_first_dev) { 275 if (user_dev_name[0]) 276 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name); 277 else 278 printk(KERN_ERR "IP-Config: No network devices available.\n"); 279 return -ENODEV; 280 } 281 return 0; 282 } 283 284 static void __init ic_close_devs(void) 285 { 286 struct ic_device *d, *next; 287 struct net_device *dev; 288 289 rtnl_lock(); 290 next = ic_first_dev; 291 while ((d = next)) { 292 next = d->next; 293 dev = d->dev; 294 if (dev != ic_dev) { 295 DBG(("IP-Config: Downing %s\n", dev->name)); 296 dev_change_flags(dev, d->flags); 297 } 298 kfree(d); 299 } 300 rtnl_unlock(); 301 } 302 303 /* 304 * Interface to various network functions. 305 */ 306 307 static inline void 308 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 309 { 310 sin->sin_family = AF_INET; 311 sin->sin_addr.s_addr = addr; 312 sin->sin_port = port; 313 } 314 315 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg) 316 { 317 int res; 318 319 mm_segment_t oldfs = get_fs(); 320 set_fs(get_ds()); 321 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 322 set_fs(oldfs); 323 return res; 324 } 325 326 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 327 { 328 int res; 329 330 mm_segment_t oldfs = get_fs(); 331 set_fs(get_ds()); 332 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 333 set_fs(oldfs); 334 return res; 335 } 336 337 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 338 { 339 int res; 340 341 mm_segment_t oldfs = get_fs(); 342 set_fs(get_ds()); 343 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); 344 set_fs(oldfs); 345 return res; 346 } 347 348 /* 349 * Set up interface addresses and routes. 350 */ 351 352 static int __init ic_setup_if(void) 353 { 354 struct ifreq ir; 355 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 356 int err; 357 358 memset(&ir, 0, sizeof(ir)); 359 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); 360 set_sockaddr(sin, ic_myaddr, 0); 361 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) { 362 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err); 363 return -1; 364 } 365 set_sockaddr(sin, ic_netmask, 0); 366 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 367 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err); 368 return -1; 369 } 370 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 371 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 372 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err); 373 return -1; 374 } 375 /* Handle the case where we need non-standard MTU on the boot link (a network 376 * using jumbo frames, for instance). If we can't set the mtu, don't error 377 * out, we'll try to muddle along. 378 */ 379 if (ic_dev_mtu != 0) { 380 strcpy(ir.ifr_name, ic_dev->name); 381 ir.ifr_mtu = ic_dev_mtu; 382 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0) 383 printk(KERN_ERR "IP-Config: Unable to set interface mtu to %d (%d).\n", 384 ic_dev_mtu, err); 385 } 386 return 0; 387 } 388 389 static int __init ic_setup_routes(void) 390 { 391 /* No need to setup device routes, only the default route... */ 392 393 if (ic_gateway != NONE) { 394 struct rtentry rm; 395 int err; 396 397 memset(&rm, 0, sizeof(rm)); 398 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 399 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n"); 400 return -1; 401 } 402 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 403 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 404 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 405 rm.rt_flags = RTF_UP | RTF_GATEWAY; 406 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 407 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err); 408 return -1; 409 } 410 } 411 412 return 0; 413 } 414 415 /* 416 * Fill in default values for all missing parameters. 417 */ 418 419 static int __init ic_defaults(void) 420 { 421 /* 422 * At this point we have no userspace running so need not 423 * claim locks on system_utsname 424 */ 425 426 if (!ic_host_name_set) 427 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 428 429 if (root_server_addr == NONE) 430 root_server_addr = ic_servaddr; 431 432 if (ic_netmask == NONE) { 433 if (IN_CLASSA(ntohl(ic_myaddr))) 434 ic_netmask = htonl(IN_CLASSA_NET); 435 else if (IN_CLASSB(ntohl(ic_myaddr))) 436 ic_netmask = htonl(IN_CLASSB_NET); 437 else if (IN_CLASSC(ntohl(ic_myaddr))) 438 ic_netmask = htonl(IN_CLASSC_NET); 439 else { 440 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n", 441 &ic_myaddr); 442 return -1; 443 } 444 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask); 445 } 446 447 return 0; 448 } 449 450 /* 451 * RARP support. 452 */ 453 454 #ifdef IPCONFIG_RARP 455 456 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 457 458 static struct packet_type rarp_packet_type __initdata = { 459 .type = cpu_to_be16(ETH_P_RARP), 460 .func = ic_rarp_recv, 461 }; 462 463 static inline void __init ic_rarp_init(void) 464 { 465 dev_add_pack(&rarp_packet_type); 466 } 467 468 static inline void __init ic_rarp_cleanup(void) 469 { 470 dev_remove_pack(&rarp_packet_type); 471 } 472 473 /* 474 * Process received RARP packet. 475 */ 476 static int __init 477 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 478 { 479 struct arphdr *rarp; 480 unsigned char *rarp_ptr; 481 __be32 sip, tip; 482 unsigned char *sha, *tha; /* s for "source", t for "target" */ 483 struct ic_device *d; 484 485 if (!net_eq(dev_net(dev), &init_net)) 486 goto drop; 487 488 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 489 return NET_RX_DROP; 490 491 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 492 goto drop; 493 494 /* Basic sanity checks can be done without the lock. */ 495 rarp = (struct arphdr *)skb_transport_header(skb); 496 497 /* If this test doesn't pass, it's not IP, or we should 498 * ignore it anyway. 499 */ 500 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 501 goto drop; 502 503 /* If it's not a RARP reply, delete it. */ 504 if (rarp->ar_op != htons(ARPOP_RREPLY)) 505 goto drop; 506 507 /* If it's not Ethernet, delete it. */ 508 if (rarp->ar_pro != htons(ETH_P_IP)) 509 goto drop; 510 511 if (!pskb_may_pull(skb, arp_hdr_len(dev))) 512 goto drop; 513 514 /* OK, it is all there and looks valid, process... */ 515 rarp = (struct arphdr *)skb_transport_header(skb); 516 rarp_ptr = (unsigned char *) (rarp + 1); 517 518 /* One reply at a time, please. */ 519 spin_lock(&ic_recv_lock); 520 521 /* If we already have a reply, just drop the packet */ 522 if (ic_got_reply) 523 goto drop_unlock; 524 525 /* Find the ic_device that the packet arrived on */ 526 d = ic_first_dev; 527 while (d && d->dev != dev) 528 d = d->next; 529 if (!d) 530 goto drop_unlock; /* should never happen */ 531 532 /* Extract variable-width fields */ 533 sha = rarp_ptr; 534 rarp_ptr += dev->addr_len; 535 memcpy(&sip, rarp_ptr, 4); 536 rarp_ptr += 4; 537 tha = rarp_ptr; 538 rarp_ptr += dev->addr_len; 539 memcpy(&tip, rarp_ptr, 4); 540 541 /* Discard packets which are not meant for us. */ 542 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 543 goto drop_unlock; 544 545 /* Discard packets which are not from specified server. */ 546 if (ic_servaddr != NONE && ic_servaddr != sip) 547 goto drop_unlock; 548 549 /* We have a winner! */ 550 ic_dev = dev; 551 if (ic_myaddr == NONE) 552 ic_myaddr = tip; 553 ic_servaddr = sip; 554 ic_got_reply = IC_RARP; 555 556 drop_unlock: 557 /* Show's over. Nothing to see here. */ 558 spin_unlock(&ic_recv_lock); 559 560 drop: 561 /* Throw the packet out. */ 562 kfree_skb(skb); 563 return 0; 564 } 565 566 567 /* 568 * Send RARP request packet over a single interface. 569 */ 570 static void __init ic_rarp_send_if(struct ic_device *d) 571 { 572 struct net_device *dev = d->dev; 573 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 574 dev->dev_addr, dev->dev_addr); 575 } 576 #endif 577 578 /* 579 * DHCP/BOOTP support. 580 */ 581 582 #ifdef IPCONFIG_BOOTP 583 584 struct bootp_pkt { /* BOOTP packet format */ 585 struct iphdr iph; /* IP header */ 586 struct udphdr udph; /* UDP header */ 587 u8 op; /* 1=request, 2=reply */ 588 u8 htype; /* HW address type */ 589 u8 hlen; /* HW address length */ 590 u8 hops; /* Used only by gateways */ 591 __be32 xid; /* Transaction ID */ 592 __be16 secs; /* Seconds since we started */ 593 __be16 flags; /* Just what it says */ 594 __be32 client_ip; /* Client's IP address if known */ 595 __be32 your_ip; /* Assigned IP address */ 596 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 597 __be32 relay_ip; /* IP address of BOOTP relay */ 598 u8 hw_addr[16]; /* Client's HW address */ 599 u8 serv_name[64]; /* Server host name */ 600 u8 boot_file[128]; /* Name of boot file */ 601 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 602 }; 603 604 /* packet ops */ 605 #define BOOTP_REQUEST 1 606 #define BOOTP_REPLY 2 607 608 /* DHCP message types */ 609 #define DHCPDISCOVER 1 610 #define DHCPOFFER 2 611 #define DHCPREQUEST 3 612 #define DHCPDECLINE 4 613 #define DHCPACK 5 614 #define DHCPNAK 6 615 #define DHCPRELEASE 7 616 #define DHCPINFORM 8 617 618 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 619 620 static struct packet_type bootp_packet_type __initdata = { 621 .type = cpu_to_be16(ETH_P_IP), 622 .func = ic_bootp_recv, 623 }; 624 625 626 /* 627 * Initialize DHCP/BOOTP extension fields in the request. 628 */ 629 630 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 631 632 #ifdef IPCONFIG_DHCP 633 634 static void __init 635 ic_dhcp_init_options(u8 *options) 636 { 637 u8 mt = ((ic_servaddr == NONE) 638 ? DHCPDISCOVER : DHCPREQUEST); 639 u8 *e = options; 640 int len; 641 642 #ifdef IPCONFIG_DEBUG 643 printk("DHCP: Sending message type %d\n", mt); 644 #endif 645 646 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 647 e += 4; 648 649 *e++ = 53; /* DHCP message type */ 650 *e++ = 1; 651 *e++ = mt; 652 653 if (mt == DHCPREQUEST) { 654 *e++ = 54; /* Server ID (IP address) */ 655 *e++ = 4; 656 memcpy(e, &ic_servaddr, 4); 657 e += 4; 658 659 *e++ = 50; /* Requested IP address */ 660 *e++ = 4; 661 memcpy(e, &ic_myaddr, 4); 662 e += 4; 663 } 664 665 /* always? */ 666 { 667 static const u8 ic_req_params[] = { 668 1, /* Subnet mask */ 669 3, /* Default gateway */ 670 6, /* DNS server */ 671 12, /* Host name */ 672 15, /* Domain name */ 673 17, /* Boot path */ 674 26, /* MTU */ 675 40, /* NIS domain name */ 676 }; 677 678 *e++ = 55; /* Parameter request list */ 679 *e++ = sizeof(ic_req_params); 680 memcpy(e, ic_req_params, sizeof(ic_req_params)); 681 e += sizeof(ic_req_params); 682 683 if (ic_host_name_set) { 684 *e++ = 12; /* host-name */ 685 len = strlen(utsname()->nodename); 686 *e++ = len; 687 memcpy(e, utsname()->nodename, len); 688 e += len; 689 } 690 if (*vendor_class_identifier) { 691 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n", 692 vendor_class_identifier); 693 *e++ = 60; /* Class-identifier */ 694 len = strlen(vendor_class_identifier); 695 *e++ = len; 696 memcpy(e, vendor_class_identifier, len); 697 e += len; 698 } 699 } 700 701 *e++ = 255; /* End of the list */ 702 } 703 704 #endif /* IPCONFIG_DHCP */ 705 706 static void __init ic_bootp_init_ext(u8 *e) 707 { 708 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 709 e += 4; 710 *e++ = 1; /* Subnet mask request */ 711 *e++ = 4; 712 e += 4; 713 *e++ = 3; /* Default gateway request */ 714 *e++ = 4; 715 e += 4; 716 *e++ = 5; /* Name server request */ 717 *e++ = 8; 718 e += 8; 719 *e++ = 12; /* Host name request */ 720 *e++ = 32; 721 e += 32; 722 *e++ = 40; /* NIS Domain name request */ 723 *e++ = 32; 724 e += 32; 725 *e++ = 17; /* Boot path */ 726 *e++ = 40; 727 e += 40; 728 729 *e++ = 57; /* set extension buffer size for reply */ 730 *e++ = 2; 731 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 732 *e++ = 150; 733 734 *e++ = 255; /* End of the list */ 735 } 736 737 738 /* 739 * Initialize the DHCP/BOOTP mechanism. 740 */ 741 static inline void __init ic_bootp_init(void) 742 { 743 int i; 744 745 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 746 ic_nameservers[i] = NONE; 747 748 dev_add_pack(&bootp_packet_type); 749 } 750 751 752 /* 753 * DHCP/BOOTP cleanup. 754 */ 755 static inline void __init ic_bootp_cleanup(void) 756 { 757 dev_remove_pack(&bootp_packet_type); 758 } 759 760 761 /* 762 * Send DHCP/BOOTP request to single interface. 763 */ 764 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 765 { 766 struct net_device *dev = d->dev; 767 struct sk_buff *skb; 768 struct bootp_pkt *b; 769 struct iphdr *h; 770 int hlen = LL_RESERVED_SPACE(dev); 771 int tlen = dev->needed_tailroom; 772 773 /* Allocate packet */ 774 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, 775 GFP_KERNEL); 776 if (!skb) 777 return; 778 skb_reserve(skb, hlen); 779 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 780 memset(b, 0, sizeof(struct bootp_pkt)); 781 782 /* Construct IP header */ 783 skb_reset_network_header(skb); 784 h = ip_hdr(skb); 785 h->version = 4; 786 h->ihl = 5; 787 h->tot_len = htons(sizeof(struct bootp_pkt)); 788 h->frag_off = htons(IP_DF); 789 h->ttl = 64; 790 h->protocol = IPPROTO_UDP; 791 h->daddr = htonl(INADDR_BROADCAST); 792 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 793 794 /* Construct UDP header */ 795 b->udph.source = htons(68); 796 b->udph.dest = htons(67); 797 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 798 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 799 800 /* Construct DHCP/BOOTP header */ 801 b->op = BOOTP_REQUEST; 802 if (dev->type < 256) /* check for false types */ 803 b->htype = dev->type; 804 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ 805 b->htype = ARPHRD_IEEE802; 806 else if (dev->type == ARPHRD_FDDI) 807 b->htype = ARPHRD_ETHER; 808 else { 809 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 810 b->htype = dev->type; /* can cause undefined behavior */ 811 } 812 813 /* server_ip and your_ip address are both already zero per RFC2131 */ 814 b->hlen = dev->addr_len; 815 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 816 b->secs = htons(jiffies_diff / HZ); 817 b->xid = d->xid; 818 819 /* add DHCP options or BOOTP extensions */ 820 #ifdef IPCONFIG_DHCP 821 if (ic_proto_enabled & IC_USE_DHCP) 822 ic_dhcp_init_options(b->exten); 823 else 824 #endif 825 ic_bootp_init_ext(b->exten); 826 827 /* Chain packet down the line... */ 828 skb->dev = dev; 829 skb->protocol = htons(ETH_P_IP); 830 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 831 dev->broadcast, dev->dev_addr, skb->len) < 0) { 832 kfree_skb(skb); 833 printk("E"); 834 return; 835 } 836 837 if (dev_queue_xmit(skb) < 0) 838 printk("E"); 839 } 840 841 842 /* 843 * Copy BOOTP-supplied string if not already set. 844 */ 845 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 846 { 847 if (!len) 848 return 0; 849 if (len > max-1) 850 len = max-1; 851 memcpy(dest, src, len); 852 dest[len] = '\0'; 853 return 1; 854 } 855 856 857 /* 858 * Process BOOTP extensions. 859 */ 860 static void __init ic_do_bootp_ext(u8 *ext) 861 { 862 u8 servers; 863 int i; 864 __be16 mtu; 865 866 #ifdef IPCONFIG_DEBUG 867 u8 *c; 868 869 printk("DHCP/BOOTP: Got extension %d:",*ext); 870 for (c=ext+2; c<ext+2+ext[1]; c++) 871 printk(" %02x", *c); 872 printk("\n"); 873 #endif 874 875 switch (*ext++) { 876 case 1: /* Subnet mask */ 877 if (ic_netmask == NONE) 878 memcpy(&ic_netmask, ext+1, 4); 879 break; 880 case 3: /* Default gateway */ 881 if (ic_gateway == NONE) 882 memcpy(&ic_gateway, ext+1, 4); 883 break; 884 case 6: /* DNS server */ 885 servers= *ext/4; 886 if (servers > CONF_NAMESERVERS_MAX) 887 servers = CONF_NAMESERVERS_MAX; 888 for (i = 0; i < servers; i++) { 889 if (ic_nameservers[i] == NONE) 890 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 891 } 892 break; 893 case 12: /* Host name */ 894 ic_bootp_string(utsname()->nodename, ext+1, *ext, 895 __NEW_UTS_LEN); 896 ic_host_name_set = 1; 897 break; 898 case 15: /* Domain name (DNS) */ 899 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 900 break; 901 case 17: /* Root path */ 902 if (!root_server_path[0]) 903 ic_bootp_string(root_server_path, ext+1, *ext, 904 sizeof(root_server_path)); 905 break; 906 case 26: /* Interface MTU */ 907 memcpy(&mtu, ext+1, sizeof(mtu)); 908 ic_dev_mtu = ntohs(mtu); 909 break; 910 case 40: /* NIS Domain name (_not_ DNS) */ 911 ic_bootp_string(utsname()->domainname, ext+1, *ext, 912 __NEW_UTS_LEN); 913 break; 914 } 915 } 916 917 918 /* 919 * Receive BOOTP reply. 920 */ 921 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 922 { 923 struct bootp_pkt *b; 924 struct iphdr *h; 925 struct ic_device *d; 926 int len, ext_len; 927 928 if (!net_eq(dev_net(dev), &init_net)) 929 goto drop; 930 931 /* Perform verifications before taking the lock. */ 932 if (skb->pkt_type == PACKET_OTHERHOST) 933 goto drop; 934 935 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 936 return NET_RX_DROP; 937 938 if (!pskb_may_pull(skb, 939 sizeof(struct iphdr) + 940 sizeof(struct udphdr))) 941 goto drop; 942 943 b = (struct bootp_pkt *)skb_network_header(skb); 944 h = &b->iph; 945 946 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 947 goto drop; 948 949 /* Fragments are not supported */ 950 if (ip_is_fragment(h)) { 951 if (net_ratelimit()) 952 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " 953 "reply.\n"); 954 goto drop; 955 } 956 957 if (skb->len < ntohs(h->tot_len)) 958 goto drop; 959 960 if (ip_fast_csum((char *) h, h->ihl)) 961 goto drop; 962 963 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 964 goto drop; 965 966 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 967 goto drop; 968 969 len = ntohs(b->udph.len) - sizeof(struct udphdr); 970 ext_len = len - (sizeof(*b) - 971 sizeof(struct iphdr) - 972 sizeof(struct udphdr) - 973 sizeof(b->exten)); 974 if (ext_len < 0) 975 goto drop; 976 977 /* Ok the front looks good, make sure we can get at the rest. */ 978 if (!pskb_may_pull(skb, skb->len)) 979 goto drop; 980 981 b = (struct bootp_pkt *)skb_network_header(skb); 982 h = &b->iph; 983 984 /* One reply at a time, please. */ 985 spin_lock(&ic_recv_lock); 986 987 /* If we already have a reply, just drop the packet */ 988 if (ic_got_reply) 989 goto drop_unlock; 990 991 /* Find the ic_device that the packet arrived on */ 992 d = ic_first_dev; 993 while (d && d->dev != dev) 994 d = d->next; 995 if (!d) 996 goto drop_unlock; /* should never happen */ 997 998 /* Is it a reply to our BOOTP request? */ 999 if (b->op != BOOTP_REPLY || 1000 b->xid != d->xid) { 1001 if (net_ratelimit()) 1002 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " 1003 "op[%x] xid[%x]\n", 1004 b->op, b->xid); 1005 goto drop_unlock; 1006 } 1007 1008 /* Is it a reply for the device we are configuring? */ 1009 if (b->xid != ic_dev_xid) { 1010 if (net_ratelimit()) 1011 printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet\n"); 1012 goto drop_unlock; 1013 } 1014 1015 /* Parse extensions */ 1016 if (ext_len >= 4 && 1017 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1018 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1019 u8 *ext; 1020 1021 #ifdef IPCONFIG_DHCP 1022 if (ic_proto_enabled & IC_USE_DHCP) { 1023 __be32 server_id = NONE; 1024 int mt = 0; 1025 1026 ext = &b->exten[4]; 1027 while (ext < end && *ext != 0xff) { 1028 u8 *opt = ext++; 1029 if (*opt == 0) /* Padding */ 1030 continue; 1031 ext += *ext + 1; 1032 if (ext >= end) 1033 break; 1034 switch (*opt) { 1035 case 53: /* Message type */ 1036 if (opt[1]) 1037 mt = opt[2]; 1038 break; 1039 case 54: /* Server ID (IP address) */ 1040 if (opt[1] >= 4) 1041 memcpy(&server_id, opt + 2, 4); 1042 break; 1043 } 1044 } 1045 1046 #ifdef IPCONFIG_DEBUG 1047 printk("DHCP: Got message type %d\n", mt); 1048 #endif 1049 1050 switch (mt) { 1051 case DHCPOFFER: 1052 /* While in the process of accepting one offer, 1053 * ignore all others. 1054 */ 1055 if (ic_myaddr != NONE) 1056 goto drop_unlock; 1057 1058 /* Let's accept that offer. */ 1059 ic_myaddr = b->your_ip; 1060 ic_servaddr = server_id; 1061 #ifdef IPCONFIG_DEBUG 1062 printk("DHCP: Offered address %pI4 by server %pI4\n", 1063 &ic_myaddr, &ic_servaddr); 1064 #endif 1065 /* The DHCP indicated server address takes 1066 * precedence over the bootp header one if 1067 * they are different. 1068 */ 1069 if ((server_id != NONE) && 1070 (b->server_ip != server_id)) 1071 b->server_ip = ic_servaddr; 1072 break; 1073 1074 case DHCPACK: 1075 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1076 goto drop_unlock; 1077 1078 /* Yeah! */ 1079 break; 1080 1081 default: 1082 /* Urque. Forget it*/ 1083 ic_myaddr = NONE; 1084 ic_servaddr = NONE; 1085 goto drop_unlock; 1086 } 1087 1088 ic_dhcp_msgtype = mt; 1089 1090 } 1091 #endif /* IPCONFIG_DHCP */ 1092 1093 ext = &b->exten[4]; 1094 while (ext < end && *ext != 0xff) { 1095 u8 *opt = ext++; 1096 if (*opt == 0) /* Padding */ 1097 continue; 1098 ext += *ext + 1; 1099 if (ext < end) 1100 ic_do_bootp_ext(opt); 1101 } 1102 } 1103 1104 /* We have a winner! */ 1105 ic_dev = dev; 1106 ic_myaddr = b->your_ip; 1107 ic_servaddr = b->server_ip; 1108 if (ic_gateway == NONE && b->relay_ip) 1109 ic_gateway = b->relay_ip; 1110 if (ic_nameservers[0] == NONE) 1111 ic_nameservers[0] = ic_servaddr; 1112 ic_got_reply = IC_BOOTP; 1113 1114 drop_unlock: 1115 /* Show's over. Nothing to see here. */ 1116 spin_unlock(&ic_recv_lock); 1117 1118 drop: 1119 /* Throw the packet out. */ 1120 kfree_skb(skb); 1121 1122 return 0; 1123 } 1124 1125 1126 #endif 1127 1128 1129 /* 1130 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1131 */ 1132 1133 #ifdef IPCONFIG_DYNAMIC 1134 1135 static int __init ic_dynamic(void) 1136 { 1137 int retries; 1138 struct ic_device *d; 1139 unsigned long start_jiffies, timeout, jiff; 1140 int do_bootp = ic_proto_have_if & IC_BOOTP; 1141 int do_rarp = ic_proto_have_if & IC_RARP; 1142 1143 /* 1144 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1145 * This routine gets only called when some pieces of information 1146 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1147 */ 1148 if (!ic_proto_enabled) { 1149 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1150 return -1; 1151 } 1152 1153 #ifdef IPCONFIG_BOOTP 1154 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1155 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); 1156 #endif 1157 #ifdef IPCONFIG_RARP 1158 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1159 printk(KERN_ERR "RARP: No suitable device found.\n"); 1160 #endif 1161 1162 if (!ic_proto_have_if) 1163 /* Error message already printed */ 1164 return -1; 1165 1166 /* 1167 * Setup protocols 1168 */ 1169 #ifdef IPCONFIG_BOOTP 1170 if (do_bootp) 1171 ic_bootp_init(); 1172 #endif 1173 #ifdef IPCONFIG_RARP 1174 if (do_rarp) 1175 ic_rarp_init(); 1176 #endif 1177 1178 /* 1179 * Send requests and wait, until we get an answer. This loop 1180 * seems to be a terrible waste of CPU time, but actually there is 1181 * only one process running at all, so we don't need to use any 1182 * scheduler functions. 1183 * [Actually we could now, but the nothing else running note still 1184 * applies.. - AC] 1185 */ 1186 printk(KERN_NOTICE "Sending %s%s%s requests .", 1187 do_bootp 1188 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1189 (do_bootp && do_rarp) ? " and " : "", 1190 do_rarp ? "RARP" : ""); 1191 1192 start_jiffies = jiffies; 1193 d = ic_first_dev; 1194 retries = CONF_SEND_RETRIES; 1195 get_random_bytes(&timeout, sizeof(timeout)); 1196 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); 1197 for (;;) { 1198 /* Track the device we are configuring */ 1199 ic_dev_xid = d->xid; 1200 1201 #ifdef IPCONFIG_BOOTP 1202 if (do_bootp && (d->able & IC_BOOTP)) 1203 ic_bootp_send_if(d, jiffies - start_jiffies); 1204 #endif 1205 #ifdef IPCONFIG_RARP 1206 if (do_rarp && (d->able & IC_RARP)) 1207 ic_rarp_send_if(d); 1208 #endif 1209 1210 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1211 while (time_before(jiffies, jiff) && !ic_got_reply) 1212 schedule_timeout_uninterruptible(1); 1213 #ifdef IPCONFIG_DHCP 1214 /* DHCP isn't done until we get a DHCPACK. */ 1215 if ((ic_got_reply & IC_BOOTP) && 1216 (ic_proto_enabled & IC_USE_DHCP) && 1217 ic_dhcp_msgtype != DHCPACK) { 1218 ic_got_reply = 0; 1219 printk(KERN_CONT ","); 1220 continue; 1221 } 1222 #endif /* IPCONFIG_DHCP */ 1223 1224 if (ic_got_reply) { 1225 printk(KERN_CONT " OK\n"); 1226 break; 1227 } 1228 1229 if ((d = d->next)) 1230 continue; 1231 1232 if (! --retries) { 1233 printk(KERN_CONT " timed out!\n"); 1234 break; 1235 } 1236 1237 d = ic_first_dev; 1238 1239 timeout = timeout CONF_TIMEOUT_MULT; 1240 if (timeout > CONF_TIMEOUT_MAX) 1241 timeout = CONF_TIMEOUT_MAX; 1242 1243 printk(KERN_CONT "."); 1244 } 1245 1246 #ifdef IPCONFIG_BOOTP 1247 if (do_bootp) 1248 ic_bootp_cleanup(); 1249 #endif 1250 #ifdef IPCONFIG_RARP 1251 if (do_rarp) 1252 ic_rarp_cleanup(); 1253 #endif 1254 1255 if (!ic_got_reply) { 1256 ic_myaddr = NONE; 1257 return -1; 1258 } 1259 1260 printk("IP-Config: Got %s answer from %pI4, ", 1261 ((ic_got_reply & IC_RARP) ? "RARP" 1262 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1263 &ic_servaddr); 1264 printk(KERN_CONT "my address is %pI4\n", &ic_myaddr); 1265 1266 return 0; 1267 } 1268 1269 #endif /* IPCONFIG_DYNAMIC */ 1270 1271 #ifdef CONFIG_PROC_FS 1272 1273 static int pnp_seq_show(struct seq_file *seq, void *v) 1274 { 1275 int i; 1276 1277 if (ic_proto_used & IC_PROTO) 1278 seq_printf(seq, "#PROTO: %s\n", 1279 (ic_proto_used & IC_RARP) ? "RARP" 1280 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1281 else 1282 seq_puts(seq, "#MANUAL\n"); 1283 1284 if (ic_domain[0]) 1285 seq_printf(seq, 1286 "domain %s\n", ic_domain); 1287 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1288 if (ic_nameservers[i] != NONE) 1289 seq_printf(seq, "nameserver %pI4\n", 1290 &ic_nameservers[i]); 1291 } 1292 if (ic_servaddr != NONE) 1293 seq_printf(seq, "bootserver %pI4\n", 1294 &ic_servaddr); 1295 return 0; 1296 } 1297 1298 static int pnp_seq_open(struct inode *indoe, struct file *file) 1299 { 1300 return single_open(file, pnp_seq_show, NULL); 1301 } 1302 1303 static const struct file_operations pnp_seq_fops = { 1304 .owner = THIS_MODULE, 1305 .open = pnp_seq_open, 1306 .read = seq_read, 1307 .llseek = seq_lseek, 1308 .release = single_release, 1309 }; 1310 #endif /* CONFIG_PROC_FS */ 1311 1312 /* 1313 * Extract IP address from the parameter string if needed. Note that we 1314 * need to have root_server_addr set _before_ IPConfig gets called as it 1315 * can override it. 1316 */ 1317 __be32 __init root_nfs_parse_addr(char *name) 1318 { 1319 __be32 addr; 1320 int octets = 0; 1321 char *cp, *cq; 1322 1323 cp = cq = name; 1324 while (octets < 4) { 1325 while (*cp >= '0' && *cp <= '9') 1326 cp++; 1327 if (cp == cq || cp - cq > 3) 1328 break; 1329 if (*cp == '.' || octets == 3) 1330 octets++; 1331 if (octets < 4) 1332 cp++; 1333 cq = cp; 1334 } 1335 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1336 if (*cp == ':') 1337 *cp++ = '\0'; 1338 addr = in_aton(name); 1339 memmove(name, cp, strlen(cp) + 1); 1340 } else 1341 addr = NONE; 1342 1343 return addr; 1344 } 1345 1346 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1347 1348 static int __init wait_for_devices(void) 1349 { 1350 int i; 1351 1352 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1353 struct net_device *dev; 1354 int found = 0; 1355 1356 rtnl_lock(); 1357 for_each_netdev(&init_net, dev) { 1358 if (ic_is_init_dev(dev)) { 1359 found = 1; 1360 break; 1361 } 1362 } 1363 rtnl_unlock(); 1364 if (found) 1365 return 0; 1366 ssleep(1); 1367 } 1368 return -ENODEV; 1369 } 1370 1371 /* 1372 * IP Autoconfig dispatcher. 1373 */ 1374 1375 static int __init ip_auto_config(void) 1376 { 1377 __be32 addr; 1378 #ifdef IPCONFIG_DYNAMIC 1379 int retries = CONF_OPEN_RETRIES; 1380 #endif 1381 int err; 1382 1383 #ifdef CONFIG_PROC_FS 1384 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops); 1385 #endif /* CONFIG_PROC_FS */ 1386 1387 if (!ic_enable) 1388 return 0; 1389 1390 DBG(("IP-Config: Entered.\n")); 1391 #ifdef IPCONFIG_DYNAMIC 1392 try_try_again: 1393 #endif 1394 /* Wait for devices to appear */ 1395 err = wait_for_devices(); 1396 if (err) 1397 return err; 1398 1399 /* Setup all network devices */ 1400 err = ic_open_devs(); 1401 if (err) 1402 return err; 1403 1404 /* Give drivers a chance to settle */ 1405 msleep(CONF_POST_OPEN); 1406 1407 /* 1408 * If the config information is insufficient (e.g., our IP address or 1409 * IP address of the boot server is missing or we have multiple network 1410 * interfaces and no default was set), use BOOTP or RARP to get the 1411 * missing values. 1412 */ 1413 if (ic_myaddr == NONE || 1414 #ifdef CONFIG_ROOT_NFS 1415 (root_server_addr == NONE && 1416 ic_servaddr == NONE && 1417 ROOT_DEV == Root_NFS) || 1418 #endif 1419 ic_first_dev->next) { 1420 #ifdef IPCONFIG_DYNAMIC 1421 if (ic_dynamic() < 0) { 1422 ic_close_devs(); 1423 1424 /* 1425 * I don't know why, but sometimes the 1426 * eepro100 driver (at least) gets upset and 1427 * doesn't work the first time it's opened. 1428 * But then if you close it and reopen it, it 1429 * works just fine. So we need to try that at 1430 * least once before giving up. 1431 * 1432 * Also, if the root will be NFS-mounted, we 1433 * have nowhere to go if DHCP fails. So we 1434 * just have to keep trying forever. 1435 * 1436 * -- Chip 1437 */ 1438 #ifdef CONFIG_ROOT_NFS 1439 if (ROOT_DEV == Root_NFS) { 1440 printk(KERN_ERR 1441 "IP-Config: Retrying forever (NFS root)...\n"); 1442 goto try_try_again; 1443 } 1444 #endif 1445 1446 if (--retries) { 1447 printk(KERN_ERR 1448 "IP-Config: Reopening network devices...\n"); 1449 goto try_try_again; 1450 } 1451 1452 /* Oh, well. At least we tried. */ 1453 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); 1454 return -1; 1455 } 1456 #else /* !DYNAMIC */ 1457 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1458 ic_close_devs(); 1459 return -1; 1460 #endif /* IPCONFIG_DYNAMIC */ 1461 } else { 1462 /* Device selected manually or only one device -> use it */ 1463 ic_dev = ic_first_dev->dev; 1464 } 1465 1466 addr = root_nfs_parse_addr(root_server_path); 1467 if (root_server_addr == NONE) 1468 root_server_addr = addr; 1469 1470 /* 1471 * Use defaults wherever applicable. 1472 */ 1473 if (ic_defaults() < 0) 1474 return -1; 1475 1476 /* 1477 * Close all network devices except the device we've 1478 * autoconfigured and set up routes. 1479 */ 1480 ic_close_devs(); 1481 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1482 return -1; 1483 1484 /* 1485 * Record which protocol was actually used. 1486 */ 1487 #ifdef IPCONFIG_DYNAMIC 1488 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1489 #endif 1490 1491 #ifndef IPCONFIG_SILENT 1492 /* 1493 * Clue in the operator. 1494 */ 1495 printk("IP-Config: Complete:\n"); 1496 printk(" device=%s", ic_dev->name); 1497 printk(KERN_CONT ", addr=%pI4", &ic_myaddr); 1498 printk(KERN_CONT ", mask=%pI4", &ic_netmask); 1499 printk(KERN_CONT ", gw=%pI4", &ic_gateway); 1500 printk(KERN_CONT ",\n host=%s, domain=%s, nis-domain=%s", 1501 utsname()->nodename, ic_domain, utsname()->domainname); 1502 printk(KERN_CONT ",\n bootserver=%pI4", &ic_servaddr); 1503 printk(KERN_CONT ", rootserver=%pI4", &root_server_addr); 1504 printk(KERN_CONT ", rootpath=%s", root_server_path); 1505 if (ic_dev_mtu) 1506 printk(KERN_CONT ", mtu=%d", ic_dev_mtu); 1507 printk(KERN_CONT "\n"); 1508 #endif /* !SILENT */ 1509 1510 return 0; 1511 } 1512 1513 late_initcall(ip_auto_config); 1514 1515 1516 /* 1517 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1518 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. 1519 */ 1520 static int __init ic_proto_name(char *name) 1521 { 1522 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1523 return 1; 1524 } 1525 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1526 return 0; 1527 } 1528 #ifdef CONFIG_IP_PNP_DHCP 1529 else if (!strcmp(name, "dhcp")) { 1530 ic_proto_enabled &= ~IC_RARP; 1531 return 1; 1532 } 1533 #endif 1534 #ifdef CONFIG_IP_PNP_BOOTP 1535 else if (!strcmp(name, "bootp")) { 1536 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1537 return 1; 1538 } 1539 #endif 1540 #ifdef CONFIG_IP_PNP_RARP 1541 else if (!strcmp(name, "rarp")) { 1542 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1543 return 1; 1544 } 1545 #endif 1546 #ifdef IPCONFIG_DYNAMIC 1547 else if (!strcmp(name, "both")) { 1548 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1549 return 1; 1550 } 1551 #endif 1552 return 0; 1553 } 1554 1555 static int __init ip_auto_config_setup(char *addrs) 1556 { 1557 char *cp, *ip, *dp; 1558 int num = 0; 1559 1560 ic_set_manually = 1; 1561 ic_enable = 1; 1562 1563 /* 1564 * If any dhcp, bootp etc options are set, leave autoconfig on 1565 * and skip the below static IP processing. 1566 */ 1567 if (ic_proto_name(addrs)) 1568 return 1; 1569 1570 /* If no static IP is given, turn off autoconfig and bail. */ 1571 if (*addrs == 0 || 1572 strcmp(addrs, "off") == 0 || 1573 strcmp(addrs, "none") == 0) { 1574 ic_enable = 0; 1575 return 1; 1576 } 1577 1578 /* Parse string for static IP assignment. */ 1579 ip = addrs; 1580 while (ip && *ip) { 1581 if ((cp = strchr(ip, ':'))) 1582 *cp++ = '\0'; 1583 if (strlen(ip) > 0) { 1584 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); 1585 switch (num) { 1586 case 0: 1587 if ((ic_myaddr = in_aton(ip)) == ANY) 1588 ic_myaddr = NONE; 1589 break; 1590 case 1: 1591 if ((ic_servaddr = in_aton(ip)) == ANY) 1592 ic_servaddr = NONE; 1593 break; 1594 case 2: 1595 if ((ic_gateway = in_aton(ip)) == ANY) 1596 ic_gateway = NONE; 1597 break; 1598 case 3: 1599 if ((ic_netmask = in_aton(ip)) == ANY) 1600 ic_netmask = NONE; 1601 break; 1602 case 4: 1603 if ((dp = strchr(ip, '.'))) { 1604 *dp++ = '\0'; 1605 strlcpy(utsname()->domainname, dp, 1606 sizeof(utsname()->domainname)); 1607 } 1608 strlcpy(utsname()->nodename, ip, 1609 sizeof(utsname()->nodename)); 1610 ic_host_name_set = 1; 1611 break; 1612 case 5: 1613 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1614 break; 1615 case 6: 1616 if (ic_proto_name(ip) == 0 && 1617 ic_myaddr == NONE) { 1618 ic_enable = 0; 1619 } 1620 break; 1621 } 1622 } 1623 ip = cp; 1624 num++; 1625 } 1626 1627 return 1; 1628 } 1629 1630 static int __init nfsaddrs_config_setup(char *addrs) 1631 { 1632 return ip_auto_config_setup(addrs); 1633 } 1634 1635 static int __init vendor_class_identifier_setup(char *addrs) 1636 { 1637 if (strlcpy(vendor_class_identifier, addrs, 1638 sizeof(vendor_class_identifier)) 1639 >= sizeof(vendor_class_identifier)) 1640 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"", 1641 vendor_class_identifier); 1642 return 1; 1643 } 1644 1645 __setup("ip=", ip_auto_config_setup); 1646 __setup("nfsaddrs=", nfsaddrs_config_setup); 1647 __setup("dhcpclass=", vendor_class_identifier_setup); 1648