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_PRE_OPEN 500 /* Before opening: 1/2 second */ 91 #define CONF_POST_OPEN 1 /* After opening: 1 second */ 92 93 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ 94 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ 95 #define CONF_SEND_RETRIES 6 /* Send six requests per open */ 96 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */ 97 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ 98 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ 99 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ 100 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ 101 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers 102 - '3' from resolv.h */ 103 104 #define NONE 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_device_match(struct net_device *dev) 192 { 193 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 194 (!(dev->flags & IFF_LOOPBACK) && 195 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 196 strncmp(dev->name, "dummy", 5))) 197 return true; 198 return false; 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; 206 207 last = &ic_first_dev; 208 rtnl_lock(); 209 210 /* bring loopback device up first */ 211 for_each_netdev(&init_net, dev) { 212 if (!(dev->flags & IFF_LOOPBACK)) 213 continue; 214 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) 215 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); 216 } 217 218 for_each_netdev(&init_net, dev) { 219 if (dev->flags & IFF_LOOPBACK) 220 continue; 221 if (ic_device_match(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 rtnl_unlock(); 256 257 *last = NULL; 258 259 if (!ic_first_dev) { 260 if (user_dev_name[0]) 261 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name); 262 else 263 printk(KERN_ERR "IP-Config: No network devices available.\n"); 264 return -ENODEV; 265 } 266 return 0; 267 } 268 269 static void __init ic_close_devs(void) 270 { 271 struct ic_device *d, *next; 272 struct net_device *dev; 273 274 rtnl_lock(); 275 next = ic_first_dev; 276 while ((d = next)) { 277 next = d->next; 278 dev = d->dev; 279 if (dev != ic_dev) { 280 DBG(("IP-Config: Downing %s\n", dev->name)); 281 dev_change_flags(dev, d->flags); 282 } 283 kfree(d); 284 } 285 rtnl_unlock(); 286 } 287 288 /* 289 * Interface to various network functions. 290 */ 291 292 static inline void 293 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 294 { 295 sin->sin_family = AF_INET; 296 sin->sin_addr.s_addr = addr; 297 sin->sin_port = port; 298 } 299 300 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg) 301 { 302 int res; 303 304 mm_segment_t oldfs = get_fs(); 305 set_fs(get_ds()); 306 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 307 set_fs(oldfs); 308 return res; 309 } 310 311 static int __init ic_dev_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 = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 318 set_fs(oldfs); 319 return res; 320 } 321 322 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 323 { 324 int res; 325 326 mm_segment_t oldfs = get_fs(); 327 set_fs(get_ds()); 328 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); 329 set_fs(oldfs); 330 return res; 331 } 332 333 /* 334 * Set up interface addresses and routes. 335 */ 336 337 static int __init ic_setup_if(void) 338 { 339 struct ifreq ir; 340 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 341 int err; 342 343 memset(&ir, 0, sizeof(ir)); 344 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); 345 set_sockaddr(sin, ic_myaddr, 0); 346 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) { 347 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err); 348 return -1; 349 } 350 set_sockaddr(sin, ic_netmask, 0); 351 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 352 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err); 353 return -1; 354 } 355 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 356 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 357 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err); 358 return -1; 359 } 360 /* Handle the case where we need non-standard MTU on the boot link (a network 361 * using jumbo frames, for instance). If we can't set the mtu, don't error 362 * out, we'll try to muddle along. 363 */ 364 if (ic_dev_mtu != 0) { 365 strcpy(ir.ifr_name, ic_dev->name); 366 ir.ifr_mtu = ic_dev_mtu; 367 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0) 368 printk(KERN_ERR "IP-Config: Unable to set interface mtu to %d (%d).\n", 369 ic_dev_mtu, err); 370 } 371 return 0; 372 } 373 374 static int __init ic_setup_routes(void) 375 { 376 /* No need to setup device routes, only the default route... */ 377 378 if (ic_gateway != NONE) { 379 struct rtentry rm; 380 int err; 381 382 memset(&rm, 0, sizeof(rm)); 383 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 384 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n"); 385 return -1; 386 } 387 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 388 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 389 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 390 rm.rt_flags = RTF_UP | RTF_GATEWAY; 391 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 392 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err); 393 return -1; 394 } 395 } 396 397 return 0; 398 } 399 400 /* 401 * Fill in default values for all missing parameters. 402 */ 403 404 static int __init ic_defaults(void) 405 { 406 /* 407 * At this point we have no userspace running so need not 408 * claim locks on system_utsname 409 */ 410 411 if (!ic_host_name_set) 412 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 413 414 if (root_server_addr == NONE) 415 root_server_addr = ic_servaddr; 416 417 if (ic_netmask == NONE) { 418 if (IN_CLASSA(ntohl(ic_myaddr))) 419 ic_netmask = htonl(IN_CLASSA_NET); 420 else if (IN_CLASSB(ntohl(ic_myaddr))) 421 ic_netmask = htonl(IN_CLASSB_NET); 422 else if (IN_CLASSC(ntohl(ic_myaddr))) 423 ic_netmask = htonl(IN_CLASSC_NET); 424 else { 425 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n", 426 &ic_myaddr); 427 return -1; 428 } 429 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask); 430 } 431 432 return 0; 433 } 434 435 /* 436 * RARP support. 437 */ 438 439 #ifdef IPCONFIG_RARP 440 441 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 442 443 static struct packet_type rarp_packet_type __initdata = { 444 .type = cpu_to_be16(ETH_P_RARP), 445 .func = ic_rarp_recv, 446 }; 447 448 static inline void __init ic_rarp_init(void) 449 { 450 dev_add_pack(&rarp_packet_type); 451 } 452 453 static inline void __init ic_rarp_cleanup(void) 454 { 455 dev_remove_pack(&rarp_packet_type); 456 } 457 458 /* 459 * Process received RARP packet. 460 */ 461 static int __init 462 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 463 { 464 struct arphdr *rarp; 465 unsigned char *rarp_ptr; 466 __be32 sip, tip; 467 unsigned char *sha, *tha; /* s for "source", t for "target" */ 468 struct ic_device *d; 469 470 if (!net_eq(dev_net(dev), &init_net)) 471 goto drop; 472 473 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 474 return NET_RX_DROP; 475 476 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 477 goto drop; 478 479 /* Basic sanity checks can be done without the lock. */ 480 rarp = (struct arphdr *)skb_transport_header(skb); 481 482 /* If this test doesn't pass, it's not IP, or we should 483 * ignore it anyway. 484 */ 485 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 486 goto drop; 487 488 /* If it's not a RARP reply, delete it. */ 489 if (rarp->ar_op != htons(ARPOP_RREPLY)) 490 goto drop; 491 492 /* If it's not Ethernet, delete it. */ 493 if (rarp->ar_pro != htons(ETH_P_IP)) 494 goto drop; 495 496 if (!pskb_may_pull(skb, arp_hdr_len(dev))) 497 goto drop; 498 499 /* OK, it is all there and looks valid, process... */ 500 rarp = (struct arphdr *)skb_transport_header(skb); 501 rarp_ptr = (unsigned char *) (rarp + 1); 502 503 /* One reply at a time, please. */ 504 spin_lock(&ic_recv_lock); 505 506 /* If we already have a reply, just drop the packet */ 507 if (ic_got_reply) 508 goto drop_unlock; 509 510 /* Find the ic_device that the packet arrived on */ 511 d = ic_first_dev; 512 while (d && d->dev != dev) 513 d = d->next; 514 if (!d) 515 goto drop_unlock; /* should never happen */ 516 517 /* Extract variable-width fields */ 518 sha = rarp_ptr; 519 rarp_ptr += dev->addr_len; 520 memcpy(&sip, rarp_ptr, 4); 521 rarp_ptr += 4; 522 tha = rarp_ptr; 523 rarp_ptr += dev->addr_len; 524 memcpy(&tip, rarp_ptr, 4); 525 526 /* Discard packets which are not meant for us. */ 527 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 528 goto drop_unlock; 529 530 /* Discard packets which are not from specified server. */ 531 if (ic_servaddr != NONE && ic_servaddr != sip) 532 goto drop_unlock; 533 534 /* We have a winner! */ 535 ic_dev = dev; 536 if (ic_myaddr == NONE) 537 ic_myaddr = tip; 538 ic_servaddr = sip; 539 ic_got_reply = IC_RARP; 540 541 drop_unlock: 542 /* Show's over. Nothing to see here. */ 543 spin_unlock(&ic_recv_lock); 544 545 drop: 546 /* Throw the packet out. */ 547 kfree_skb(skb); 548 return 0; 549 } 550 551 552 /* 553 * Send RARP request packet over a single interface. 554 */ 555 static void __init ic_rarp_send_if(struct ic_device *d) 556 { 557 struct net_device *dev = d->dev; 558 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 559 dev->dev_addr, dev->dev_addr); 560 } 561 #endif 562 563 /* 564 * DHCP/BOOTP support. 565 */ 566 567 #ifdef IPCONFIG_BOOTP 568 569 struct bootp_pkt { /* BOOTP packet format */ 570 struct iphdr iph; /* IP header */ 571 struct udphdr udph; /* UDP header */ 572 u8 op; /* 1=request, 2=reply */ 573 u8 htype; /* HW address type */ 574 u8 hlen; /* HW address length */ 575 u8 hops; /* Used only by gateways */ 576 __be32 xid; /* Transaction ID */ 577 __be16 secs; /* Seconds since we started */ 578 __be16 flags; /* Just what it says */ 579 __be32 client_ip; /* Client's IP address if known */ 580 __be32 your_ip; /* Assigned IP address */ 581 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 582 __be32 relay_ip; /* IP address of BOOTP relay */ 583 u8 hw_addr[16]; /* Client's HW address */ 584 u8 serv_name[64]; /* Server host name */ 585 u8 boot_file[128]; /* Name of boot file */ 586 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 587 }; 588 589 /* packet ops */ 590 #define BOOTP_REQUEST 1 591 #define BOOTP_REPLY 2 592 593 /* DHCP message types */ 594 #define DHCPDISCOVER 1 595 #define DHCPOFFER 2 596 #define DHCPREQUEST 3 597 #define DHCPDECLINE 4 598 #define DHCPACK 5 599 #define DHCPNAK 6 600 #define DHCPRELEASE 7 601 #define DHCPINFORM 8 602 603 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 604 605 static struct packet_type bootp_packet_type __initdata = { 606 .type = cpu_to_be16(ETH_P_IP), 607 .func = ic_bootp_recv, 608 }; 609 610 611 /* 612 * Initialize DHCP/BOOTP extension fields in the request. 613 */ 614 615 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 616 617 #ifdef IPCONFIG_DHCP 618 619 static void __init 620 ic_dhcp_init_options(u8 *options) 621 { 622 u8 mt = ((ic_servaddr == NONE) 623 ? DHCPDISCOVER : DHCPREQUEST); 624 u8 *e = options; 625 int len; 626 627 #ifdef IPCONFIG_DEBUG 628 printk("DHCP: Sending message type %d\n", mt); 629 #endif 630 631 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 632 e += 4; 633 634 *e++ = 53; /* DHCP message type */ 635 *e++ = 1; 636 *e++ = mt; 637 638 if (mt == DHCPREQUEST) { 639 *e++ = 54; /* Server ID (IP address) */ 640 *e++ = 4; 641 memcpy(e, &ic_servaddr, 4); 642 e += 4; 643 644 *e++ = 50; /* Requested IP address */ 645 *e++ = 4; 646 memcpy(e, &ic_myaddr, 4); 647 e += 4; 648 } 649 650 /* always? */ 651 { 652 static const u8 ic_req_params[] = { 653 1, /* Subnet mask */ 654 3, /* Default gateway */ 655 6, /* DNS server */ 656 12, /* Host name */ 657 15, /* Domain name */ 658 17, /* Boot path */ 659 26, /* MTU */ 660 40, /* NIS domain name */ 661 }; 662 663 *e++ = 55; /* Parameter request list */ 664 *e++ = sizeof(ic_req_params); 665 memcpy(e, ic_req_params, sizeof(ic_req_params)); 666 e += sizeof(ic_req_params); 667 668 if (ic_host_name_set) { 669 *e++ = 12; /* host-name */ 670 len = strlen(utsname()->nodename); 671 *e++ = len; 672 memcpy(e, utsname()->nodename, len); 673 e += len; 674 } 675 if (*vendor_class_identifier) { 676 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n", 677 vendor_class_identifier); 678 *e++ = 60; /* Class-identifier */ 679 len = strlen(vendor_class_identifier); 680 *e++ = len; 681 memcpy(e, vendor_class_identifier, len); 682 e += len; 683 } 684 } 685 686 *e++ = 255; /* End of the list */ 687 } 688 689 #endif /* IPCONFIG_DHCP */ 690 691 static void __init ic_bootp_init_ext(u8 *e) 692 { 693 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 694 e += 4; 695 *e++ = 1; /* Subnet mask request */ 696 *e++ = 4; 697 e += 4; 698 *e++ = 3; /* Default gateway request */ 699 *e++ = 4; 700 e += 4; 701 *e++ = 5; /* Name server request */ 702 *e++ = 8; 703 e += 8; 704 *e++ = 12; /* Host name request */ 705 *e++ = 32; 706 e += 32; 707 *e++ = 40; /* NIS Domain name request */ 708 *e++ = 32; 709 e += 32; 710 *e++ = 17; /* Boot path */ 711 *e++ = 40; 712 e += 40; 713 714 *e++ = 57; /* set extension buffer size for reply */ 715 *e++ = 2; 716 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 717 *e++ = 150; 718 719 *e++ = 255; /* End of the list */ 720 } 721 722 723 /* 724 * Initialize the DHCP/BOOTP mechanism. 725 */ 726 static inline void __init ic_bootp_init(void) 727 { 728 int i; 729 730 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 731 ic_nameservers[i] = NONE; 732 733 dev_add_pack(&bootp_packet_type); 734 } 735 736 737 /* 738 * DHCP/BOOTP cleanup. 739 */ 740 static inline void __init ic_bootp_cleanup(void) 741 { 742 dev_remove_pack(&bootp_packet_type); 743 } 744 745 746 /* 747 * Send DHCP/BOOTP request to single interface. 748 */ 749 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 750 { 751 struct net_device *dev = d->dev; 752 struct sk_buff *skb; 753 struct bootp_pkt *b; 754 struct iphdr *h; 755 756 /* Allocate packet */ 757 skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15, 758 GFP_KERNEL); 759 if (!skb) 760 return; 761 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 762 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 763 memset(b, 0, sizeof(struct bootp_pkt)); 764 765 /* Construct IP header */ 766 skb_reset_network_header(skb); 767 h = ip_hdr(skb); 768 h->version = 4; 769 h->ihl = 5; 770 h->tot_len = htons(sizeof(struct bootp_pkt)); 771 h->frag_off = htons(IP_DF); 772 h->ttl = 64; 773 h->protocol = IPPROTO_UDP; 774 h->daddr = htonl(INADDR_BROADCAST); 775 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 776 777 /* Construct UDP header */ 778 b->udph.source = htons(68); 779 b->udph.dest = htons(67); 780 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 781 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 782 783 /* Construct DHCP/BOOTP header */ 784 b->op = BOOTP_REQUEST; 785 if (dev->type < 256) /* check for false types */ 786 b->htype = dev->type; 787 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ 788 b->htype = ARPHRD_IEEE802; 789 else if (dev->type == ARPHRD_FDDI) 790 b->htype = ARPHRD_ETHER; 791 else { 792 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 793 b->htype = dev->type; /* can cause undefined behavior */ 794 } 795 796 /* server_ip and your_ip address are both already zero per RFC2131 */ 797 b->hlen = dev->addr_len; 798 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 799 b->secs = htons(jiffies_diff / HZ); 800 b->xid = d->xid; 801 802 /* add DHCP options or BOOTP extensions */ 803 #ifdef IPCONFIG_DHCP 804 if (ic_proto_enabled & IC_USE_DHCP) 805 ic_dhcp_init_options(b->exten); 806 else 807 #endif 808 ic_bootp_init_ext(b->exten); 809 810 /* Chain packet down the line... */ 811 skb->dev = dev; 812 skb->protocol = htons(ETH_P_IP); 813 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 814 dev->broadcast, dev->dev_addr, skb->len) < 0 || 815 dev_queue_xmit(skb) < 0) 816 printk("E"); 817 } 818 819 820 /* 821 * Copy BOOTP-supplied string if not already set. 822 */ 823 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 824 { 825 if (!len) 826 return 0; 827 if (len > max-1) 828 len = max-1; 829 memcpy(dest, src, len); 830 dest[len] = '\0'; 831 return 1; 832 } 833 834 835 /* 836 * Process BOOTP extensions. 837 */ 838 static void __init ic_do_bootp_ext(u8 *ext) 839 { 840 u8 servers; 841 int i; 842 u16 mtu; 843 844 #ifdef IPCONFIG_DEBUG 845 u8 *c; 846 847 printk("DHCP/BOOTP: Got extension %d:",*ext); 848 for (c=ext+2; c<ext+2+ext[1]; c++) 849 printk(" %02x", *c); 850 printk("\n"); 851 #endif 852 853 switch (*ext++) { 854 case 1: /* Subnet mask */ 855 if (ic_netmask == NONE) 856 memcpy(&ic_netmask, ext+1, 4); 857 break; 858 case 3: /* Default gateway */ 859 if (ic_gateway == NONE) 860 memcpy(&ic_gateway, ext+1, 4); 861 break; 862 case 6: /* DNS server */ 863 servers= *ext/4; 864 if (servers > CONF_NAMESERVERS_MAX) 865 servers = CONF_NAMESERVERS_MAX; 866 for (i = 0; i < servers; i++) { 867 if (ic_nameservers[i] == NONE) 868 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 869 } 870 break; 871 case 12: /* Host name */ 872 ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN); 873 ic_host_name_set = 1; 874 break; 875 case 15: /* Domain name (DNS) */ 876 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 877 break; 878 case 17: /* Root path */ 879 if (!root_server_path[0]) 880 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path)); 881 break; 882 case 26: /* Interface MTU */ 883 memcpy(&mtu, ext+1, sizeof(mtu)); 884 ic_dev_mtu = ntohs(mtu); 885 break; 886 case 40: /* NIS Domain name (_not_ DNS) */ 887 ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN); 888 break; 889 } 890 } 891 892 893 /* 894 * Receive BOOTP reply. 895 */ 896 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 897 { 898 struct bootp_pkt *b; 899 struct iphdr *h; 900 struct ic_device *d; 901 int len, ext_len; 902 903 if (!net_eq(dev_net(dev), &init_net)) 904 goto drop; 905 906 /* Perform verifications before taking the lock. */ 907 if (skb->pkt_type == PACKET_OTHERHOST) 908 goto drop; 909 910 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 911 return NET_RX_DROP; 912 913 if (!pskb_may_pull(skb, 914 sizeof(struct iphdr) + 915 sizeof(struct udphdr))) 916 goto drop; 917 918 b = (struct bootp_pkt *)skb_network_header(skb); 919 h = &b->iph; 920 921 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 922 goto drop; 923 924 /* Fragments are not supported */ 925 if (h->frag_off & htons(IP_OFFSET | IP_MF)) { 926 if (net_ratelimit()) 927 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " 928 "reply.\n"); 929 goto drop; 930 } 931 932 if (skb->len < ntohs(h->tot_len)) 933 goto drop; 934 935 if (ip_fast_csum((char *) h, h->ihl)) 936 goto drop; 937 938 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 939 goto drop; 940 941 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 942 goto drop; 943 944 len = ntohs(b->udph.len) - sizeof(struct udphdr); 945 ext_len = len - (sizeof(*b) - 946 sizeof(struct iphdr) - 947 sizeof(struct udphdr) - 948 sizeof(b->exten)); 949 if (ext_len < 0) 950 goto drop; 951 952 /* Ok the front looks good, make sure we can get at the rest. */ 953 if (!pskb_may_pull(skb, skb->len)) 954 goto drop; 955 956 b = (struct bootp_pkt *)skb_network_header(skb); 957 h = &b->iph; 958 959 /* One reply at a time, please. */ 960 spin_lock(&ic_recv_lock); 961 962 /* If we already have a reply, just drop the packet */ 963 if (ic_got_reply) 964 goto drop_unlock; 965 966 /* Find the ic_device that the packet arrived on */ 967 d = ic_first_dev; 968 while (d && d->dev != dev) 969 d = d->next; 970 if (!d) 971 goto drop_unlock; /* should never happen */ 972 973 /* Is it a reply to our BOOTP request? */ 974 if (b->op != BOOTP_REPLY || 975 b->xid != d->xid) { 976 if (net_ratelimit()) 977 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " 978 "op[%x] xid[%x]\n", 979 b->op, b->xid); 980 goto drop_unlock; 981 } 982 983 /* Is it a reply for the device we are configuring? */ 984 if (b->xid != ic_dev_xid) { 985 if (net_ratelimit()) 986 printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet\n"); 987 goto drop_unlock; 988 } 989 990 /* Parse extensions */ 991 if (ext_len >= 4 && 992 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 993 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 994 u8 *ext; 995 996 #ifdef IPCONFIG_DHCP 997 if (ic_proto_enabled & IC_USE_DHCP) { 998 __be32 server_id = NONE; 999 int mt = 0; 1000 1001 ext = &b->exten[4]; 1002 while (ext < end && *ext != 0xff) { 1003 u8 *opt = ext++; 1004 if (*opt == 0) /* Padding */ 1005 continue; 1006 ext += *ext + 1; 1007 if (ext >= end) 1008 break; 1009 switch (*opt) { 1010 case 53: /* Message type */ 1011 if (opt[1]) 1012 mt = opt[2]; 1013 break; 1014 case 54: /* Server ID (IP address) */ 1015 if (opt[1] >= 4) 1016 memcpy(&server_id, opt + 2, 4); 1017 break; 1018 } 1019 } 1020 1021 #ifdef IPCONFIG_DEBUG 1022 printk("DHCP: Got message type %d\n", mt); 1023 #endif 1024 1025 switch (mt) { 1026 case DHCPOFFER: 1027 /* While in the process of accepting one offer, 1028 * ignore all others. 1029 */ 1030 if (ic_myaddr != NONE) 1031 goto drop_unlock; 1032 1033 /* Let's accept that offer. */ 1034 ic_myaddr = b->your_ip; 1035 ic_servaddr = server_id; 1036 #ifdef IPCONFIG_DEBUG 1037 printk("DHCP: Offered address %pI4 by server %pI4\n", 1038 &ic_myaddr, &ic_servaddr); 1039 #endif 1040 /* The DHCP indicated server address takes 1041 * precedence over the bootp header one if 1042 * they are different. 1043 */ 1044 if ((server_id != NONE) && 1045 (b->server_ip != server_id)) 1046 b->server_ip = ic_servaddr; 1047 break; 1048 1049 case DHCPACK: 1050 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1051 goto drop_unlock; 1052 1053 /* Yeah! */ 1054 break; 1055 1056 default: 1057 /* Urque. Forget it*/ 1058 ic_myaddr = NONE; 1059 ic_servaddr = NONE; 1060 goto drop_unlock; 1061 } 1062 1063 ic_dhcp_msgtype = mt; 1064 1065 } 1066 #endif /* IPCONFIG_DHCP */ 1067 1068 ext = &b->exten[4]; 1069 while (ext < end && *ext != 0xff) { 1070 u8 *opt = ext++; 1071 if (*opt == 0) /* Padding */ 1072 continue; 1073 ext += *ext + 1; 1074 if (ext < end) 1075 ic_do_bootp_ext(opt); 1076 } 1077 } 1078 1079 /* We have a winner! */ 1080 ic_dev = dev; 1081 ic_myaddr = b->your_ip; 1082 ic_servaddr = b->server_ip; 1083 if (ic_gateway == NONE && b->relay_ip) 1084 ic_gateway = b->relay_ip; 1085 if (ic_nameservers[0] == NONE) 1086 ic_nameservers[0] = ic_servaddr; 1087 ic_got_reply = IC_BOOTP; 1088 1089 drop_unlock: 1090 /* Show's over. Nothing to see here. */ 1091 spin_unlock(&ic_recv_lock); 1092 1093 drop: 1094 /* Throw the packet out. */ 1095 kfree_skb(skb); 1096 1097 return 0; 1098 } 1099 1100 1101 #endif 1102 1103 1104 /* 1105 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1106 */ 1107 1108 #ifdef IPCONFIG_DYNAMIC 1109 1110 static int __init ic_dynamic(void) 1111 { 1112 int retries; 1113 struct ic_device *d; 1114 unsigned long start_jiffies, timeout, jiff; 1115 int do_bootp = ic_proto_have_if & IC_BOOTP; 1116 int do_rarp = ic_proto_have_if & IC_RARP; 1117 1118 /* 1119 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1120 * This routine gets only called when some pieces of information 1121 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1122 */ 1123 if (!ic_proto_enabled) { 1124 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1125 return -1; 1126 } 1127 1128 #ifdef IPCONFIG_BOOTP 1129 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1130 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); 1131 #endif 1132 #ifdef IPCONFIG_RARP 1133 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1134 printk(KERN_ERR "RARP: No suitable device found.\n"); 1135 #endif 1136 1137 if (!ic_proto_have_if) 1138 /* Error message already printed */ 1139 return -1; 1140 1141 /* 1142 * Setup protocols 1143 */ 1144 #ifdef IPCONFIG_BOOTP 1145 if (do_bootp) 1146 ic_bootp_init(); 1147 #endif 1148 #ifdef IPCONFIG_RARP 1149 if (do_rarp) 1150 ic_rarp_init(); 1151 #endif 1152 1153 /* 1154 * Send requests and wait, until we get an answer. This loop 1155 * seems to be a terrible waste of CPU time, but actually there is 1156 * only one process running at all, so we don't need to use any 1157 * scheduler functions. 1158 * [Actually we could now, but the nothing else running note still 1159 * applies.. - AC] 1160 */ 1161 printk(KERN_NOTICE "Sending %s%s%s requests .", 1162 do_bootp 1163 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1164 (do_bootp && do_rarp) ? " and " : "", 1165 do_rarp ? "RARP" : ""); 1166 1167 start_jiffies = jiffies; 1168 d = ic_first_dev; 1169 retries = CONF_SEND_RETRIES; 1170 get_random_bytes(&timeout, sizeof(timeout)); 1171 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); 1172 for (;;) { 1173 /* Track the device we are configuring */ 1174 ic_dev_xid = d->xid; 1175 1176 #ifdef IPCONFIG_BOOTP 1177 if (do_bootp && (d->able & IC_BOOTP)) 1178 ic_bootp_send_if(d, jiffies - start_jiffies); 1179 #endif 1180 #ifdef IPCONFIG_RARP 1181 if (do_rarp && (d->able & IC_RARP)) 1182 ic_rarp_send_if(d); 1183 #endif 1184 1185 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1186 while (time_before(jiffies, jiff) && !ic_got_reply) 1187 schedule_timeout_uninterruptible(1); 1188 #ifdef IPCONFIG_DHCP 1189 /* DHCP isn't done until we get a DHCPACK. */ 1190 if ((ic_got_reply & IC_BOOTP) && 1191 (ic_proto_enabled & IC_USE_DHCP) && 1192 ic_dhcp_msgtype != DHCPACK) { 1193 ic_got_reply = 0; 1194 printk(","); 1195 continue; 1196 } 1197 #endif /* IPCONFIG_DHCP */ 1198 1199 if (ic_got_reply) { 1200 printk(" OK\n"); 1201 break; 1202 } 1203 1204 if ((d = d->next)) 1205 continue; 1206 1207 if (! --retries) { 1208 printk(" timed out!\n"); 1209 break; 1210 } 1211 1212 d = ic_first_dev; 1213 1214 timeout = timeout CONF_TIMEOUT_MULT; 1215 if (timeout > CONF_TIMEOUT_MAX) 1216 timeout = CONF_TIMEOUT_MAX; 1217 1218 printk("."); 1219 } 1220 1221 #ifdef IPCONFIG_BOOTP 1222 if (do_bootp) 1223 ic_bootp_cleanup(); 1224 #endif 1225 #ifdef IPCONFIG_RARP 1226 if (do_rarp) 1227 ic_rarp_cleanup(); 1228 #endif 1229 1230 if (!ic_got_reply) { 1231 ic_myaddr = NONE; 1232 return -1; 1233 } 1234 1235 printk("IP-Config: Got %s answer from %pI4, ", 1236 ((ic_got_reply & IC_RARP) ? "RARP" 1237 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1238 &ic_servaddr); 1239 printk("my address is %pI4\n", &ic_myaddr); 1240 1241 return 0; 1242 } 1243 1244 #endif /* IPCONFIG_DYNAMIC */ 1245 1246 #ifdef CONFIG_PROC_FS 1247 1248 static int pnp_seq_show(struct seq_file *seq, void *v) 1249 { 1250 int i; 1251 1252 if (ic_proto_used & IC_PROTO) 1253 seq_printf(seq, "#PROTO: %s\n", 1254 (ic_proto_used & IC_RARP) ? "RARP" 1255 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1256 else 1257 seq_puts(seq, "#MANUAL\n"); 1258 1259 if (ic_domain[0]) 1260 seq_printf(seq, 1261 "domain %s\n", ic_domain); 1262 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1263 if (ic_nameservers[i] != NONE) 1264 seq_printf(seq, "nameserver %pI4\n", 1265 &ic_nameservers[i]); 1266 } 1267 if (ic_servaddr != NONE) 1268 seq_printf(seq, "bootserver %pI4\n", 1269 &ic_servaddr); 1270 return 0; 1271 } 1272 1273 static int pnp_seq_open(struct inode *indoe, struct file *file) 1274 { 1275 return single_open(file, pnp_seq_show, NULL); 1276 } 1277 1278 static const struct file_operations pnp_seq_fops = { 1279 .owner = THIS_MODULE, 1280 .open = pnp_seq_open, 1281 .read = seq_read, 1282 .llseek = seq_lseek, 1283 .release = single_release, 1284 }; 1285 #endif /* CONFIG_PROC_FS */ 1286 1287 /* 1288 * Extract IP address from the parameter string if needed. Note that we 1289 * need to have root_server_addr set _before_ IPConfig gets called as it 1290 * can override it. 1291 */ 1292 __be32 __init root_nfs_parse_addr(char *name) 1293 { 1294 __be32 addr; 1295 int octets = 0; 1296 char *cp, *cq; 1297 1298 cp = cq = name; 1299 while (octets < 4) { 1300 while (*cp >= '0' && *cp <= '9') 1301 cp++; 1302 if (cp == cq || cp - cq > 3) 1303 break; 1304 if (*cp == '.' || octets == 3) 1305 octets++; 1306 if (octets < 4) 1307 cp++; 1308 cq = cp; 1309 } 1310 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1311 if (*cp == ':') 1312 *cp++ = '\0'; 1313 addr = in_aton(name); 1314 memmove(name, cp, strlen(cp) + 1); 1315 } else 1316 addr = NONE; 1317 1318 return addr; 1319 } 1320 1321 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1322 1323 static int __init wait_for_devices(void) 1324 { 1325 int i; 1326 1327 msleep(CONF_PRE_OPEN); 1328 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1329 struct net_device *dev; 1330 int found = 0; 1331 1332 rtnl_lock(); 1333 for_each_netdev(&init_net, dev) { 1334 if (ic_device_match(dev)) { 1335 found = 1; 1336 break; 1337 } 1338 } 1339 rtnl_unlock(); 1340 if (found) 1341 return 0; 1342 ssleep(1); 1343 } 1344 return -ENODEV; 1345 } 1346 1347 /* 1348 * IP Autoconfig dispatcher. 1349 */ 1350 1351 static int __init ip_auto_config(void) 1352 { 1353 __be32 addr; 1354 #ifdef IPCONFIG_DYNAMIC 1355 int retries = CONF_OPEN_RETRIES; 1356 #endif 1357 int err; 1358 1359 #ifdef CONFIG_PROC_FS 1360 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops); 1361 #endif /* CONFIG_PROC_FS */ 1362 1363 if (!ic_enable) 1364 return 0; 1365 1366 DBG(("IP-Config: Entered.\n")); 1367 #ifdef IPCONFIG_DYNAMIC 1368 try_try_again: 1369 #endif 1370 /* Wait for devices to appear */ 1371 err = wait_for_devices(); 1372 if (err) 1373 return err; 1374 1375 /* Setup all network devices */ 1376 err = ic_open_devs(); 1377 if (err) 1378 return err; 1379 1380 /* Give drivers a chance to settle */ 1381 ssleep(CONF_POST_OPEN); 1382 1383 /* 1384 * If the config information is insufficient (e.g., our IP address or 1385 * IP address of the boot server is missing or we have multiple network 1386 * interfaces and no default was set), use BOOTP or RARP to get the 1387 * missing values. 1388 */ 1389 if (ic_myaddr == NONE || 1390 #ifdef CONFIG_ROOT_NFS 1391 (root_server_addr == NONE && 1392 ic_servaddr == NONE && 1393 ROOT_DEV == Root_NFS) || 1394 #endif 1395 ic_first_dev->next) { 1396 #ifdef IPCONFIG_DYNAMIC 1397 if (ic_dynamic() < 0) { 1398 ic_close_devs(); 1399 1400 /* 1401 * I don't know why, but sometimes the 1402 * eepro100 driver (at least) gets upset and 1403 * doesn't work the first time it's opened. 1404 * But then if you close it and reopen it, it 1405 * works just fine. So we need to try that at 1406 * least once before giving up. 1407 * 1408 * Also, if the root will be NFS-mounted, we 1409 * have nowhere to go if DHCP fails. So we 1410 * just have to keep trying forever. 1411 * 1412 * -- Chip 1413 */ 1414 #ifdef CONFIG_ROOT_NFS 1415 if (ROOT_DEV == Root_NFS) { 1416 printk(KERN_ERR 1417 "IP-Config: Retrying forever (NFS root)...\n"); 1418 goto try_try_again; 1419 } 1420 #endif 1421 1422 if (--retries) { 1423 printk(KERN_ERR 1424 "IP-Config: Reopening network devices...\n"); 1425 goto try_try_again; 1426 } 1427 1428 /* Oh, well. At least we tried. */ 1429 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); 1430 return -1; 1431 } 1432 #else /* !DYNAMIC */ 1433 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1434 ic_close_devs(); 1435 return -1; 1436 #endif /* IPCONFIG_DYNAMIC */ 1437 } else { 1438 /* Device selected manually or only one device -> use it */ 1439 ic_dev = ic_first_dev->dev; 1440 } 1441 1442 addr = root_nfs_parse_addr(root_server_path); 1443 if (root_server_addr == NONE) 1444 root_server_addr = addr; 1445 1446 /* 1447 * Use defaults whereever applicable. 1448 */ 1449 if (ic_defaults() < 0) 1450 return -1; 1451 1452 /* 1453 * Close all network devices except the device we've 1454 * autoconfigured and set up routes. 1455 */ 1456 ic_close_devs(); 1457 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1458 return -1; 1459 1460 /* 1461 * Record which protocol was actually used. 1462 */ 1463 #ifdef IPCONFIG_DYNAMIC 1464 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1465 #endif 1466 1467 #ifndef IPCONFIG_SILENT 1468 /* 1469 * Clue in the operator. 1470 */ 1471 printk("IP-Config: Complete:"); 1472 printk("\n device=%s", ic_dev->name); 1473 printk(", addr=%pI4", &ic_myaddr); 1474 printk(", mask=%pI4", &ic_netmask); 1475 printk(", gw=%pI4", &ic_gateway); 1476 printk(",\n host=%s, domain=%s, nis-domain=%s", 1477 utsname()->nodename, ic_domain, utsname()->domainname); 1478 printk(",\n bootserver=%pI4", &ic_servaddr); 1479 printk(", rootserver=%pI4", &root_server_addr); 1480 printk(", rootpath=%s", root_server_path); 1481 if (ic_dev_mtu) 1482 printk(", mtu=%d", ic_dev_mtu); 1483 printk("\n"); 1484 #endif /* !SILENT */ 1485 1486 return 0; 1487 } 1488 1489 late_initcall(ip_auto_config); 1490 1491 1492 /* 1493 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1494 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. 1495 */ 1496 static int __init ic_proto_name(char *name) 1497 { 1498 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1499 return 1; 1500 } 1501 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1502 return 0; 1503 } 1504 #ifdef CONFIG_IP_PNP_DHCP 1505 else if (!strcmp(name, "dhcp")) { 1506 ic_proto_enabled &= ~IC_RARP; 1507 return 1; 1508 } 1509 #endif 1510 #ifdef CONFIG_IP_PNP_BOOTP 1511 else if (!strcmp(name, "bootp")) { 1512 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1513 return 1; 1514 } 1515 #endif 1516 #ifdef CONFIG_IP_PNP_RARP 1517 else if (!strcmp(name, "rarp")) { 1518 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1519 return 1; 1520 } 1521 #endif 1522 #ifdef IPCONFIG_DYNAMIC 1523 else if (!strcmp(name, "both")) { 1524 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1525 return 1; 1526 } 1527 #endif 1528 return 0; 1529 } 1530 1531 static int __init ip_auto_config_setup(char *addrs) 1532 { 1533 char *cp, *ip, *dp; 1534 int num = 0; 1535 1536 ic_set_manually = 1; 1537 ic_enable = 1; 1538 1539 /* 1540 * If any dhcp, bootp etc options are set, leave autoconfig on 1541 * and skip the below static IP processing. 1542 */ 1543 if (ic_proto_name(addrs)) 1544 return 1; 1545 1546 /* If no static IP is given, turn off autoconfig and bail. */ 1547 if (*addrs == 0 || 1548 strcmp(addrs, "off") == 0 || 1549 strcmp(addrs, "none") == 0) { 1550 ic_enable = 0; 1551 return 1; 1552 } 1553 1554 /* Parse string for static IP assignment. */ 1555 ip = addrs; 1556 while (ip && *ip) { 1557 if ((cp = strchr(ip, ':'))) 1558 *cp++ = '\0'; 1559 if (strlen(ip) > 0) { 1560 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); 1561 switch (num) { 1562 case 0: 1563 if ((ic_myaddr = in_aton(ip)) == ANY) 1564 ic_myaddr = NONE; 1565 break; 1566 case 1: 1567 if ((ic_servaddr = in_aton(ip)) == ANY) 1568 ic_servaddr = NONE; 1569 break; 1570 case 2: 1571 if ((ic_gateway = in_aton(ip)) == ANY) 1572 ic_gateway = NONE; 1573 break; 1574 case 3: 1575 if ((ic_netmask = in_aton(ip)) == ANY) 1576 ic_netmask = NONE; 1577 break; 1578 case 4: 1579 if ((dp = strchr(ip, '.'))) { 1580 *dp++ = '\0'; 1581 strlcpy(utsname()->domainname, dp, 1582 sizeof(utsname()->domainname)); 1583 } 1584 strlcpy(utsname()->nodename, ip, 1585 sizeof(utsname()->nodename)); 1586 ic_host_name_set = 1; 1587 break; 1588 case 5: 1589 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1590 break; 1591 case 6: 1592 if (ic_proto_name(ip) == 0 && 1593 ic_myaddr == NONE) { 1594 ic_enable = 0; 1595 } 1596 break; 1597 } 1598 } 1599 ip = cp; 1600 num++; 1601 } 1602 1603 return 1; 1604 } 1605 1606 static int __init nfsaddrs_config_setup(char *addrs) 1607 { 1608 return ip_auto_config_setup(addrs); 1609 } 1610 1611 static int __init vendor_class_identifier_setup(char *addrs) 1612 { 1613 if (strlcpy(vendor_class_identifier, addrs, 1614 sizeof(vendor_class_identifier)) 1615 >= sizeof(vendor_class_identifier)) 1616 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"", 1617 vendor_class_identifier); 1618 return 1; 1619 } 1620 1621 __setup("ip=", ip_auto_config_setup); 1622 __setup("nfsaddrs=", nfsaddrs_config_setup); 1623 __setup("dhcpclass=", vendor_class_identifier_setup); 1624