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 (*vendor_class_identifier) { 669 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n", 670 vendor_class_identifier); 671 *e++ = 60; /* Class-identifier */ 672 len = strlen(vendor_class_identifier); 673 *e++ = len; 674 memcpy(e, vendor_class_identifier, len); 675 e += len; 676 } 677 } 678 679 *e++ = 255; /* End of the list */ 680 } 681 682 #endif /* IPCONFIG_DHCP */ 683 684 static void __init ic_bootp_init_ext(u8 *e) 685 { 686 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 687 e += 4; 688 *e++ = 1; /* Subnet mask request */ 689 *e++ = 4; 690 e += 4; 691 *e++ = 3; /* Default gateway request */ 692 *e++ = 4; 693 e += 4; 694 *e++ = 5; /* Name server request */ 695 *e++ = 8; 696 e += 8; 697 *e++ = 12; /* Host name request */ 698 *e++ = 32; 699 e += 32; 700 *e++ = 40; /* NIS Domain name request */ 701 *e++ = 32; 702 e += 32; 703 *e++ = 17; /* Boot path */ 704 *e++ = 40; 705 e += 40; 706 707 *e++ = 57; /* set extension buffer size for reply */ 708 *e++ = 2; 709 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 710 *e++ = 150; 711 712 *e++ = 255; /* End of the list */ 713 } 714 715 716 /* 717 * Initialize the DHCP/BOOTP mechanism. 718 */ 719 static inline void __init ic_bootp_init(void) 720 { 721 int i; 722 723 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 724 ic_nameservers[i] = NONE; 725 726 dev_add_pack(&bootp_packet_type); 727 } 728 729 730 /* 731 * DHCP/BOOTP cleanup. 732 */ 733 static inline void __init ic_bootp_cleanup(void) 734 { 735 dev_remove_pack(&bootp_packet_type); 736 } 737 738 739 /* 740 * Send DHCP/BOOTP request to single interface. 741 */ 742 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 743 { 744 struct net_device *dev = d->dev; 745 struct sk_buff *skb; 746 struct bootp_pkt *b; 747 struct iphdr *h; 748 749 /* Allocate packet */ 750 skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15, 751 GFP_KERNEL); 752 if (!skb) 753 return; 754 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 755 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 756 memset(b, 0, sizeof(struct bootp_pkt)); 757 758 /* Construct IP header */ 759 skb_reset_network_header(skb); 760 h = ip_hdr(skb); 761 h->version = 4; 762 h->ihl = 5; 763 h->tot_len = htons(sizeof(struct bootp_pkt)); 764 h->frag_off = htons(IP_DF); 765 h->ttl = 64; 766 h->protocol = IPPROTO_UDP; 767 h->daddr = htonl(INADDR_BROADCAST); 768 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 769 770 /* Construct UDP header */ 771 b->udph.source = htons(68); 772 b->udph.dest = htons(67); 773 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 774 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 775 776 /* Construct DHCP/BOOTP header */ 777 b->op = BOOTP_REQUEST; 778 if (dev->type < 256) /* check for false types */ 779 b->htype = dev->type; 780 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ 781 b->htype = ARPHRD_IEEE802; 782 else if (dev->type == ARPHRD_FDDI) 783 b->htype = ARPHRD_ETHER; 784 else { 785 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 786 b->htype = dev->type; /* can cause undefined behavior */ 787 } 788 789 /* server_ip and your_ip address are both already zero per RFC2131 */ 790 b->hlen = dev->addr_len; 791 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 792 b->secs = htons(jiffies_diff / HZ); 793 b->xid = d->xid; 794 795 /* add DHCP options or BOOTP extensions */ 796 #ifdef IPCONFIG_DHCP 797 if (ic_proto_enabled & IC_USE_DHCP) 798 ic_dhcp_init_options(b->exten); 799 else 800 #endif 801 ic_bootp_init_ext(b->exten); 802 803 /* Chain packet down the line... */ 804 skb->dev = dev; 805 skb->protocol = htons(ETH_P_IP); 806 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 807 dev->broadcast, dev->dev_addr, skb->len) < 0 || 808 dev_queue_xmit(skb) < 0) 809 printk("E"); 810 } 811 812 813 /* 814 * Copy BOOTP-supplied string if not already set. 815 */ 816 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 817 { 818 if (!len) 819 return 0; 820 if (len > max-1) 821 len = max-1; 822 memcpy(dest, src, len); 823 dest[len] = '\0'; 824 return 1; 825 } 826 827 828 /* 829 * Process BOOTP extensions. 830 */ 831 static void __init ic_do_bootp_ext(u8 *ext) 832 { 833 u8 servers; 834 int i; 835 u16 mtu; 836 837 #ifdef IPCONFIG_DEBUG 838 u8 *c; 839 840 printk("DHCP/BOOTP: Got extension %d:",*ext); 841 for (c=ext+2; c<ext+2+ext[1]; c++) 842 printk(" %02x", *c); 843 printk("\n"); 844 #endif 845 846 switch (*ext++) { 847 case 1: /* Subnet mask */ 848 if (ic_netmask == NONE) 849 memcpy(&ic_netmask, ext+1, 4); 850 break; 851 case 3: /* Default gateway */ 852 if (ic_gateway == NONE) 853 memcpy(&ic_gateway, ext+1, 4); 854 break; 855 case 6: /* DNS server */ 856 servers= *ext/4; 857 if (servers > CONF_NAMESERVERS_MAX) 858 servers = CONF_NAMESERVERS_MAX; 859 for (i = 0; i < servers; i++) { 860 if (ic_nameservers[i] == NONE) 861 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 862 } 863 break; 864 case 12: /* Host name */ 865 ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN); 866 ic_host_name_set = 1; 867 break; 868 case 15: /* Domain name (DNS) */ 869 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 870 break; 871 case 17: /* Root path */ 872 if (!root_server_path[0]) 873 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path)); 874 break; 875 case 26: /* Interface MTU */ 876 memcpy(&mtu, ext+1, sizeof(mtu)); 877 ic_dev_mtu = ntohs(mtu); 878 break; 879 case 40: /* NIS Domain name (_not_ DNS) */ 880 ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN); 881 break; 882 } 883 } 884 885 886 /* 887 * Receive BOOTP reply. 888 */ 889 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 890 { 891 struct bootp_pkt *b; 892 struct iphdr *h; 893 struct ic_device *d; 894 int len, ext_len; 895 896 if (!net_eq(dev_net(dev), &init_net)) 897 goto drop; 898 899 /* Perform verifications before taking the lock. */ 900 if (skb->pkt_type == PACKET_OTHERHOST) 901 goto drop; 902 903 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 904 return NET_RX_DROP; 905 906 if (!pskb_may_pull(skb, 907 sizeof(struct iphdr) + 908 sizeof(struct udphdr))) 909 goto drop; 910 911 b = (struct bootp_pkt *)skb_network_header(skb); 912 h = &b->iph; 913 914 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 915 goto drop; 916 917 /* Fragments are not supported */ 918 if (h->frag_off & htons(IP_OFFSET | IP_MF)) { 919 if (net_ratelimit()) 920 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " 921 "reply.\n"); 922 goto drop; 923 } 924 925 if (skb->len < ntohs(h->tot_len)) 926 goto drop; 927 928 if (ip_fast_csum((char *) h, h->ihl)) 929 goto drop; 930 931 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 932 goto drop; 933 934 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 935 goto drop; 936 937 len = ntohs(b->udph.len) - sizeof(struct udphdr); 938 ext_len = len - (sizeof(*b) - 939 sizeof(struct iphdr) - 940 sizeof(struct udphdr) - 941 sizeof(b->exten)); 942 if (ext_len < 0) 943 goto drop; 944 945 /* Ok the front looks good, make sure we can get at the rest. */ 946 if (!pskb_may_pull(skb, skb->len)) 947 goto drop; 948 949 b = (struct bootp_pkt *)skb_network_header(skb); 950 h = &b->iph; 951 952 /* One reply at a time, please. */ 953 spin_lock(&ic_recv_lock); 954 955 /* If we already have a reply, just drop the packet */ 956 if (ic_got_reply) 957 goto drop_unlock; 958 959 /* Find the ic_device that the packet arrived on */ 960 d = ic_first_dev; 961 while (d && d->dev != dev) 962 d = d->next; 963 if (!d) 964 goto drop_unlock; /* should never happen */ 965 966 /* Is it a reply to our BOOTP request? */ 967 if (b->op != BOOTP_REPLY || 968 b->xid != d->xid) { 969 if (net_ratelimit()) 970 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " 971 "op[%x] xid[%x]\n", 972 b->op, b->xid); 973 goto drop_unlock; 974 } 975 976 /* Is it a reply for the device we are configuring? */ 977 if (b->xid != ic_dev_xid) { 978 if (net_ratelimit()) 979 printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet \n"); 980 goto drop_unlock; 981 } 982 983 /* Parse extensions */ 984 if (ext_len >= 4 && 985 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 986 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 987 u8 *ext; 988 989 #ifdef IPCONFIG_DHCP 990 if (ic_proto_enabled & IC_USE_DHCP) { 991 __be32 server_id = NONE; 992 int mt = 0; 993 994 ext = &b->exten[4]; 995 while (ext < end && *ext != 0xff) { 996 u8 *opt = ext++; 997 if (*opt == 0) /* Padding */ 998 continue; 999 ext += *ext + 1; 1000 if (ext >= end) 1001 break; 1002 switch (*opt) { 1003 case 53: /* Message type */ 1004 if (opt[1]) 1005 mt = opt[2]; 1006 break; 1007 case 54: /* Server ID (IP address) */ 1008 if (opt[1] >= 4) 1009 memcpy(&server_id, opt + 2, 4); 1010 break; 1011 } 1012 } 1013 1014 #ifdef IPCONFIG_DEBUG 1015 printk("DHCP: Got message type %d\n", mt); 1016 #endif 1017 1018 switch (mt) { 1019 case DHCPOFFER: 1020 /* While in the process of accepting one offer, 1021 * ignore all others. 1022 */ 1023 if (ic_myaddr != NONE) 1024 goto drop_unlock; 1025 1026 /* Let's accept that offer. */ 1027 ic_myaddr = b->your_ip; 1028 ic_servaddr = server_id; 1029 #ifdef IPCONFIG_DEBUG 1030 printk("DHCP: Offered address %pI4 by server %pI4\n", 1031 &ic_myaddr, &ic_servaddr); 1032 #endif 1033 /* The DHCP indicated server address takes 1034 * precedence over the bootp header one if 1035 * they are different. 1036 */ 1037 if ((server_id != NONE) && 1038 (b->server_ip != server_id)) 1039 b->server_ip = ic_servaddr; 1040 break; 1041 1042 case DHCPACK: 1043 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1044 goto drop_unlock; 1045 1046 /* Yeah! */ 1047 break; 1048 1049 default: 1050 /* Urque. Forget it*/ 1051 ic_myaddr = NONE; 1052 ic_servaddr = NONE; 1053 goto drop_unlock; 1054 } 1055 1056 ic_dhcp_msgtype = mt; 1057 1058 } 1059 #endif /* IPCONFIG_DHCP */ 1060 1061 ext = &b->exten[4]; 1062 while (ext < end && *ext != 0xff) { 1063 u8 *opt = ext++; 1064 if (*opt == 0) /* Padding */ 1065 continue; 1066 ext += *ext + 1; 1067 if (ext < end) 1068 ic_do_bootp_ext(opt); 1069 } 1070 } 1071 1072 /* We have a winner! */ 1073 ic_dev = dev; 1074 ic_myaddr = b->your_ip; 1075 ic_servaddr = b->server_ip; 1076 if (ic_gateway == NONE && b->relay_ip) 1077 ic_gateway = b->relay_ip; 1078 if (ic_nameservers[0] == NONE) 1079 ic_nameservers[0] = ic_servaddr; 1080 ic_got_reply = IC_BOOTP; 1081 1082 drop_unlock: 1083 /* Show's over. Nothing to see here. */ 1084 spin_unlock(&ic_recv_lock); 1085 1086 drop: 1087 /* Throw the packet out. */ 1088 kfree_skb(skb); 1089 1090 return 0; 1091 } 1092 1093 1094 #endif 1095 1096 1097 /* 1098 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1099 */ 1100 1101 #ifdef IPCONFIG_DYNAMIC 1102 1103 static int __init ic_dynamic(void) 1104 { 1105 int retries; 1106 struct ic_device *d; 1107 unsigned long start_jiffies, timeout, jiff; 1108 int do_bootp = ic_proto_have_if & IC_BOOTP; 1109 int do_rarp = ic_proto_have_if & IC_RARP; 1110 1111 /* 1112 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1113 * This routine gets only called when some pieces of information 1114 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1115 */ 1116 if (!ic_proto_enabled) { 1117 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1118 return -1; 1119 } 1120 1121 #ifdef IPCONFIG_BOOTP 1122 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1123 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); 1124 #endif 1125 #ifdef IPCONFIG_RARP 1126 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1127 printk(KERN_ERR "RARP: No suitable device found.\n"); 1128 #endif 1129 1130 if (!ic_proto_have_if) 1131 /* Error message already printed */ 1132 return -1; 1133 1134 /* 1135 * Setup protocols 1136 */ 1137 #ifdef IPCONFIG_BOOTP 1138 if (do_bootp) 1139 ic_bootp_init(); 1140 #endif 1141 #ifdef IPCONFIG_RARP 1142 if (do_rarp) 1143 ic_rarp_init(); 1144 #endif 1145 1146 /* 1147 * Send requests and wait, until we get an answer. This loop 1148 * seems to be a terrible waste of CPU time, but actually there is 1149 * only one process running at all, so we don't need to use any 1150 * scheduler functions. 1151 * [Actually we could now, but the nothing else running note still 1152 * applies.. - AC] 1153 */ 1154 printk(KERN_NOTICE "Sending %s%s%s requests .", 1155 do_bootp 1156 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1157 (do_bootp && do_rarp) ? " and " : "", 1158 do_rarp ? "RARP" : ""); 1159 1160 start_jiffies = jiffies; 1161 d = ic_first_dev; 1162 retries = CONF_SEND_RETRIES; 1163 get_random_bytes(&timeout, sizeof(timeout)); 1164 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); 1165 for (;;) { 1166 /* Track the device we are configuring */ 1167 ic_dev_xid = d->xid; 1168 1169 #ifdef IPCONFIG_BOOTP 1170 if (do_bootp && (d->able & IC_BOOTP)) 1171 ic_bootp_send_if(d, jiffies - start_jiffies); 1172 #endif 1173 #ifdef IPCONFIG_RARP 1174 if (do_rarp && (d->able & IC_RARP)) 1175 ic_rarp_send_if(d); 1176 #endif 1177 1178 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1179 while (time_before(jiffies, jiff) && !ic_got_reply) 1180 schedule_timeout_uninterruptible(1); 1181 #ifdef IPCONFIG_DHCP 1182 /* DHCP isn't done until we get a DHCPACK. */ 1183 if ((ic_got_reply & IC_BOOTP) && 1184 (ic_proto_enabled & IC_USE_DHCP) && 1185 ic_dhcp_msgtype != DHCPACK) { 1186 ic_got_reply = 0; 1187 printk(","); 1188 continue; 1189 } 1190 #endif /* IPCONFIG_DHCP */ 1191 1192 if (ic_got_reply) { 1193 printk(" OK\n"); 1194 break; 1195 } 1196 1197 if ((d = d->next)) 1198 continue; 1199 1200 if (! --retries) { 1201 printk(" timed out!\n"); 1202 break; 1203 } 1204 1205 d = ic_first_dev; 1206 1207 timeout = timeout CONF_TIMEOUT_MULT; 1208 if (timeout > CONF_TIMEOUT_MAX) 1209 timeout = CONF_TIMEOUT_MAX; 1210 1211 printk("."); 1212 } 1213 1214 #ifdef IPCONFIG_BOOTP 1215 if (do_bootp) 1216 ic_bootp_cleanup(); 1217 #endif 1218 #ifdef IPCONFIG_RARP 1219 if (do_rarp) 1220 ic_rarp_cleanup(); 1221 #endif 1222 1223 if (!ic_got_reply) { 1224 ic_myaddr = NONE; 1225 return -1; 1226 } 1227 1228 printk("IP-Config: Got %s answer from %pI4, ", 1229 ((ic_got_reply & IC_RARP) ? "RARP" 1230 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1231 &ic_servaddr); 1232 printk("my address is %pI4\n", &ic_myaddr); 1233 1234 return 0; 1235 } 1236 1237 #endif /* IPCONFIG_DYNAMIC */ 1238 1239 #ifdef CONFIG_PROC_FS 1240 1241 static int pnp_seq_show(struct seq_file *seq, void *v) 1242 { 1243 int i; 1244 1245 if (ic_proto_used & IC_PROTO) 1246 seq_printf(seq, "#PROTO: %s\n", 1247 (ic_proto_used & IC_RARP) ? "RARP" 1248 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1249 else 1250 seq_puts(seq, "#MANUAL\n"); 1251 1252 if (ic_domain[0]) 1253 seq_printf(seq, 1254 "domain %s\n", ic_domain); 1255 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1256 if (ic_nameservers[i] != NONE) 1257 seq_printf(seq, "nameserver %pI4\n", 1258 &ic_nameservers[i]); 1259 } 1260 if (ic_servaddr != NONE) 1261 seq_printf(seq, "bootserver %pI4\n", 1262 &ic_servaddr); 1263 return 0; 1264 } 1265 1266 static int pnp_seq_open(struct inode *indoe, struct file *file) 1267 { 1268 return single_open(file, pnp_seq_show, NULL); 1269 } 1270 1271 static const struct file_operations pnp_seq_fops = { 1272 .owner = THIS_MODULE, 1273 .open = pnp_seq_open, 1274 .read = seq_read, 1275 .llseek = seq_lseek, 1276 .release = single_release, 1277 }; 1278 #endif /* CONFIG_PROC_FS */ 1279 1280 /* 1281 * Extract IP address from the parameter string if needed. Note that we 1282 * need to have root_server_addr set _before_ IPConfig gets called as it 1283 * can override it. 1284 */ 1285 __be32 __init root_nfs_parse_addr(char *name) 1286 { 1287 __be32 addr; 1288 int octets = 0; 1289 char *cp, *cq; 1290 1291 cp = cq = name; 1292 while (octets < 4) { 1293 while (*cp >= '0' && *cp <= '9') 1294 cp++; 1295 if (cp == cq || cp - cq > 3) 1296 break; 1297 if (*cp == '.' || octets == 3) 1298 octets++; 1299 if (octets < 4) 1300 cp++; 1301 cq = cp; 1302 } 1303 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1304 if (*cp == ':') 1305 *cp++ = '\0'; 1306 addr = in_aton(name); 1307 memmove(name, cp, strlen(cp) + 1); 1308 } else 1309 addr = NONE; 1310 1311 return addr; 1312 } 1313 1314 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1315 1316 static int __init wait_for_devices(void) 1317 { 1318 int i; 1319 1320 msleep(CONF_PRE_OPEN); 1321 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1322 struct net_device *dev; 1323 int found = 0; 1324 1325 rtnl_lock(); 1326 for_each_netdev(&init_net, dev) { 1327 if (ic_device_match(dev)) { 1328 found = 1; 1329 break; 1330 } 1331 } 1332 rtnl_unlock(); 1333 if (found) 1334 return 0; 1335 ssleep(1); 1336 } 1337 return -ENODEV; 1338 } 1339 1340 /* 1341 * IP Autoconfig dispatcher. 1342 */ 1343 1344 static int __init ip_auto_config(void) 1345 { 1346 __be32 addr; 1347 #ifdef IPCONFIG_DYNAMIC 1348 int retries = CONF_OPEN_RETRIES; 1349 #endif 1350 int err; 1351 1352 #ifdef CONFIG_PROC_FS 1353 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops); 1354 #endif /* CONFIG_PROC_FS */ 1355 1356 if (!ic_enable) 1357 return 0; 1358 1359 DBG(("IP-Config: Entered.\n")); 1360 #ifdef IPCONFIG_DYNAMIC 1361 try_try_again: 1362 #endif 1363 /* Wait for devices to appear */ 1364 err = wait_for_devices(); 1365 if (err) 1366 return err; 1367 1368 /* Setup all network devices */ 1369 err = ic_open_devs(); 1370 if (err) 1371 return err; 1372 1373 /* Give drivers a chance to settle */ 1374 ssleep(CONF_POST_OPEN); 1375 1376 /* 1377 * If the config information is insufficient (e.g., our IP address or 1378 * IP address of the boot server is missing or we have multiple network 1379 * interfaces and no default was set), use BOOTP or RARP to get the 1380 * missing values. 1381 */ 1382 if (ic_myaddr == NONE || 1383 #ifdef CONFIG_ROOT_NFS 1384 (root_server_addr == NONE && 1385 ic_servaddr == NONE && 1386 ROOT_DEV == Root_NFS) || 1387 #endif 1388 ic_first_dev->next) { 1389 #ifdef IPCONFIG_DYNAMIC 1390 if (ic_dynamic() < 0) { 1391 ic_close_devs(); 1392 1393 /* 1394 * I don't know why, but sometimes the 1395 * eepro100 driver (at least) gets upset and 1396 * doesn't work the first time it's opened. 1397 * But then if you close it and reopen it, it 1398 * works just fine. So we need to try that at 1399 * least once before giving up. 1400 * 1401 * Also, if the root will be NFS-mounted, we 1402 * have nowhere to go if DHCP fails. So we 1403 * just have to keep trying forever. 1404 * 1405 * -- Chip 1406 */ 1407 #ifdef CONFIG_ROOT_NFS 1408 if (ROOT_DEV == Root_NFS) { 1409 printk(KERN_ERR 1410 "IP-Config: Retrying forever (NFS root)...\n"); 1411 goto try_try_again; 1412 } 1413 #endif 1414 1415 if (--retries) { 1416 printk(KERN_ERR 1417 "IP-Config: Reopening network devices...\n"); 1418 goto try_try_again; 1419 } 1420 1421 /* Oh, well. At least we tried. */ 1422 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); 1423 return -1; 1424 } 1425 #else /* !DYNAMIC */ 1426 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1427 ic_close_devs(); 1428 return -1; 1429 #endif /* IPCONFIG_DYNAMIC */ 1430 } else { 1431 /* Device selected manually or only one device -> use it */ 1432 ic_dev = ic_first_dev->dev; 1433 } 1434 1435 addr = root_nfs_parse_addr(root_server_path); 1436 if (root_server_addr == NONE) 1437 root_server_addr = addr; 1438 1439 /* 1440 * Use defaults whereever applicable. 1441 */ 1442 if (ic_defaults() < 0) 1443 return -1; 1444 1445 /* 1446 * Close all network devices except the device we've 1447 * autoconfigured and set up routes. 1448 */ 1449 ic_close_devs(); 1450 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1451 return -1; 1452 1453 /* 1454 * Record which protocol was actually used. 1455 */ 1456 #ifdef IPCONFIG_DYNAMIC 1457 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1458 #endif 1459 1460 #ifndef IPCONFIG_SILENT 1461 /* 1462 * Clue in the operator. 1463 */ 1464 printk("IP-Config: Complete:"); 1465 printk("\n device=%s", ic_dev->name); 1466 printk(", addr=%pI4", &ic_myaddr); 1467 printk(", mask=%pI4", &ic_netmask); 1468 printk(", gw=%pI4", &ic_gateway); 1469 printk(",\n host=%s, domain=%s, nis-domain=%s", 1470 utsname()->nodename, ic_domain, utsname()->domainname); 1471 printk(",\n bootserver=%pI4", &ic_servaddr); 1472 printk(", rootserver=%pI4", &root_server_addr); 1473 printk(", rootpath=%s", root_server_path); 1474 if (ic_dev_mtu) 1475 printk(", mtu=%d", ic_dev_mtu); 1476 printk("\n"); 1477 #endif /* !SILENT */ 1478 1479 return 0; 1480 } 1481 1482 late_initcall(ip_auto_config); 1483 1484 1485 /* 1486 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1487 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. 1488 */ 1489 static int __init ic_proto_name(char *name) 1490 { 1491 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1492 return 1; 1493 } 1494 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1495 return 0; 1496 } 1497 #ifdef CONFIG_IP_PNP_DHCP 1498 else if (!strcmp(name, "dhcp")) { 1499 ic_proto_enabled &= ~IC_RARP; 1500 return 1; 1501 } 1502 #endif 1503 #ifdef CONFIG_IP_PNP_BOOTP 1504 else if (!strcmp(name, "bootp")) { 1505 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1506 return 1; 1507 } 1508 #endif 1509 #ifdef CONFIG_IP_PNP_RARP 1510 else if (!strcmp(name, "rarp")) { 1511 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1512 return 1; 1513 } 1514 #endif 1515 #ifdef IPCONFIG_DYNAMIC 1516 else if (!strcmp(name, "both")) { 1517 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1518 return 1; 1519 } 1520 #endif 1521 return 0; 1522 } 1523 1524 static int __init ip_auto_config_setup(char *addrs) 1525 { 1526 char *cp, *ip, *dp; 1527 int num = 0; 1528 1529 ic_set_manually = 1; 1530 ic_enable = 1; 1531 1532 /* 1533 * If any dhcp, bootp etc options are set, leave autoconfig on 1534 * and skip the below static IP processing. 1535 */ 1536 if (ic_proto_name(addrs)) 1537 return 1; 1538 1539 /* If no static IP is given, turn off autoconfig and bail. */ 1540 if (*addrs == 0 || 1541 strcmp(addrs, "off") == 0 || 1542 strcmp(addrs, "none") == 0) { 1543 ic_enable = 0; 1544 return 1; 1545 } 1546 1547 /* Parse string for static IP assignment. */ 1548 ip = addrs; 1549 while (ip && *ip) { 1550 if ((cp = strchr(ip, ':'))) 1551 *cp++ = '\0'; 1552 if (strlen(ip) > 0) { 1553 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); 1554 switch (num) { 1555 case 0: 1556 if ((ic_myaddr = in_aton(ip)) == ANY) 1557 ic_myaddr = NONE; 1558 break; 1559 case 1: 1560 if ((ic_servaddr = in_aton(ip)) == ANY) 1561 ic_servaddr = NONE; 1562 break; 1563 case 2: 1564 if ((ic_gateway = in_aton(ip)) == ANY) 1565 ic_gateway = NONE; 1566 break; 1567 case 3: 1568 if ((ic_netmask = in_aton(ip)) == ANY) 1569 ic_netmask = NONE; 1570 break; 1571 case 4: 1572 if ((dp = strchr(ip, '.'))) { 1573 *dp++ = '\0'; 1574 strlcpy(utsname()->domainname, dp, 1575 sizeof(utsname()->domainname)); 1576 } 1577 strlcpy(utsname()->nodename, ip, 1578 sizeof(utsname()->nodename)); 1579 ic_host_name_set = 1; 1580 break; 1581 case 5: 1582 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1583 break; 1584 case 6: 1585 if (ic_proto_name(ip) == 0 && 1586 ic_myaddr == NONE) { 1587 ic_enable = 0; 1588 } 1589 break; 1590 } 1591 } 1592 ip = cp; 1593 num++; 1594 } 1595 1596 return 1; 1597 } 1598 1599 static int __init nfsaddrs_config_setup(char *addrs) 1600 { 1601 return ip_auto_config_setup(addrs); 1602 } 1603 1604 static int __init vendor_class_identifier_setup(char *addrs) 1605 { 1606 if (strlcpy(vendor_class_identifier, addrs, 1607 sizeof(vendor_class_identifier)) 1608 >= sizeof(vendor_class_identifier)) 1609 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"", 1610 vendor_class_identifier); 1611 return 1; 1612 } 1613 1614 __setup("ip=", ip_auto_config_setup); 1615 __setup("nfsaddrs=", nfsaddrs_config_setup); 1616 __setup("dhcpclass=", vendor_class_identifier_setup); 1617