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 pr_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 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small", 227 dev->name, dev->mtu); 228 if (!(dev->flags & IFF_NOARP)) 229 able |= IC_RARP; 230 able &= ic_proto_enabled; 231 if (ic_proto_enabled && !able) 232 continue; 233 oflags = dev->flags; 234 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 235 pr_err("IP-Config: Failed to open %s\n", 236 dev->name); 237 continue; 238 } 239 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 240 rtnl_unlock(); 241 return -ENOMEM; 242 } 243 d->dev = dev; 244 *last = d; 245 last = &d->next; 246 d->flags = oflags; 247 d->able = able; 248 if (able & IC_BOOTP) 249 get_random_bytes(&d->xid, sizeof(__be32)); 250 else 251 d->xid = 0; 252 ic_proto_have_if |= able; 253 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", 254 dev->name, able, d->xid)); 255 } 256 } 257 258 /* no point in waiting if we could not bring up at least one device */ 259 if (!ic_first_dev) 260 goto have_carrier; 261 262 /* wait for a carrier on at least one device */ 263 start = jiffies; 264 while (jiffies - start < msecs_to_jiffies(CONF_CARRIER_TIMEOUT)) { 265 for_each_netdev(&init_net, dev) 266 if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) 267 goto have_carrier; 268 269 msleep(1); 270 } 271 have_carrier: 272 rtnl_unlock(); 273 274 *last = NULL; 275 276 if (!ic_first_dev) { 277 if (user_dev_name[0]) 278 pr_err("IP-Config: Device `%s' not found\n", 279 user_dev_name); 280 else 281 pr_err("IP-Config: No network devices available\n"); 282 return -ENODEV; 283 } 284 return 0; 285 } 286 287 static void __init ic_close_devs(void) 288 { 289 struct ic_device *d, *next; 290 struct net_device *dev; 291 292 rtnl_lock(); 293 next = ic_first_dev; 294 while ((d = next)) { 295 next = d->next; 296 dev = d->dev; 297 if (dev != ic_dev) { 298 DBG(("IP-Config: Downing %s\n", dev->name)); 299 dev_change_flags(dev, d->flags); 300 } 301 kfree(d); 302 } 303 rtnl_unlock(); 304 } 305 306 /* 307 * Interface to various network functions. 308 */ 309 310 static inline void 311 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 312 { 313 sin->sin_family = AF_INET; 314 sin->sin_addr.s_addr = addr; 315 sin->sin_port = port; 316 } 317 318 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg) 319 { 320 int res; 321 322 mm_segment_t oldfs = get_fs(); 323 set_fs(get_ds()); 324 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 325 set_fs(oldfs); 326 return res; 327 } 328 329 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 330 { 331 int res; 332 333 mm_segment_t oldfs = get_fs(); 334 set_fs(get_ds()); 335 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 336 set_fs(oldfs); 337 return res; 338 } 339 340 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 341 { 342 int res; 343 344 mm_segment_t oldfs = get_fs(); 345 set_fs(get_ds()); 346 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); 347 set_fs(oldfs); 348 return res; 349 } 350 351 /* 352 * Set up interface addresses and routes. 353 */ 354 355 static int __init ic_setup_if(void) 356 { 357 struct ifreq ir; 358 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 359 int err; 360 361 memset(&ir, 0, sizeof(ir)); 362 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); 363 set_sockaddr(sin, ic_myaddr, 0); 364 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) { 365 pr_err("IP-Config: Unable to set interface address (%d)\n", 366 err); 367 return -1; 368 } 369 set_sockaddr(sin, ic_netmask, 0); 370 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 371 pr_err("IP-Config: Unable to set interface netmask (%d)\n", 372 err); 373 return -1; 374 } 375 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 376 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 377 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n", 378 err); 379 return -1; 380 } 381 /* Handle the case where we need non-standard MTU on the boot link (a network 382 * using jumbo frames, for instance). If we can't set the mtu, don't error 383 * out, we'll try to muddle along. 384 */ 385 if (ic_dev_mtu != 0) { 386 strcpy(ir.ifr_name, ic_dev->name); 387 ir.ifr_mtu = ic_dev_mtu; 388 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0) 389 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", 390 ic_dev_mtu, err); 391 } 392 return 0; 393 } 394 395 static int __init ic_setup_routes(void) 396 { 397 /* No need to setup device routes, only the default route... */ 398 399 if (ic_gateway != NONE) { 400 struct rtentry rm; 401 int err; 402 403 memset(&rm, 0, sizeof(rm)); 404 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 405 pr_err("IP-Config: Gateway not on directly connected network\n"); 406 return -1; 407 } 408 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 409 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 410 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 411 rm.rt_flags = RTF_UP | RTF_GATEWAY; 412 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 413 pr_err("IP-Config: Cannot add default route (%d)\n", 414 err); 415 return -1; 416 } 417 } 418 419 return 0; 420 } 421 422 /* 423 * Fill in default values for all missing parameters. 424 */ 425 426 static int __init ic_defaults(void) 427 { 428 /* 429 * At this point we have no userspace running so need not 430 * claim locks on system_utsname 431 */ 432 433 if (!ic_host_name_set) 434 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 435 436 if (root_server_addr == NONE) 437 root_server_addr = ic_servaddr; 438 439 if (ic_netmask == NONE) { 440 if (IN_CLASSA(ntohl(ic_myaddr))) 441 ic_netmask = htonl(IN_CLASSA_NET); 442 else if (IN_CLASSB(ntohl(ic_myaddr))) 443 ic_netmask = htonl(IN_CLASSB_NET); 444 else if (IN_CLASSC(ntohl(ic_myaddr))) 445 ic_netmask = htonl(IN_CLASSC_NET); 446 else { 447 pr_err("IP-Config: Unable to guess netmask for address %pI4\n", 448 &ic_myaddr); 449 return -1; 450 } 451 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask); 452 } 453 454 return 0; 455 } 456 457 /* 458 * RARP support. 459 */ 460 461 #ifdef IPCONFIG_RARP 462 463 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 464 465 static struct packet_type rarp_packet_type __initdata = { 466 .type = cpu_to_be16(ETH_P_RARP), 467 .func = ic_rarp_recv, 468 }; 469 470 static inline void __init ic_rarp_init(void) 471 { 472 dev_add_pack(&rarp_packet_type); 473 } 474 475 static inline void __init ic_rarp_cleanup(void) 476 { 477 dev_remove_pack(&rarp_packet_type); 478 } 479 480 /* 481 * Process received RARP packet. 482 */ 483 static int __init 484 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 485 { 486 struct arphdr *rarp; 487 unsigned char *rarp_ptr; 488 __be32 sip, tip; 489 unsigned char *sha, *tha; /* s for "source", t for "target" */ 490 struct ic_device *d; 491 492 if (!net_eq(dev_net(dev), &init_net)) 493 goto drop; 494 495 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 496 return NET_RX_DROP; 497 498 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 499 goto drop; 500 501 /* Basic sanity checks can be done without the lock. */ 502 rarp = (struct arphdr *)skb_transport_header(skb); 503 504 /* If this test doesn't pass, it's not IP, or we should 505 * ignore it anyway. 506 */ 507 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 508 goto drop; 509 510 /* If it's not a RARP reply, delete it. */ 511 if (rarp->ar_op != htons(ARPOP_RREPLY)) 512 goto drop; 513 514 /* If it's not Ethernet, delete it. */ 515 if (rarp->ar_pro != htons(ETH_P_IP)) 516 goto drop; 517 518 if (!pskb_may_pull(skb, arp_hdr_len(dev))) 519 goto drop; 520 521 /* OK, it is all there and looks valid, process... */ 522 rarp = (struct arphdr *)skb_transport_header(skb); 523 rarp_ptr = (unsigned char *) (rarp + 1); 524 525 /* One reply at a time, please. */ 526 spin_lock(&ic_recv_lock); 527 528 /* If we already have a reply, just drop the packet */ 529 if (ic_got_reply) 530 goto drop_unlock; 531 532 /* Find the ic_device that the packet arrived on */ 533 d = ic_first_dev; 534 while (d && d->dev != dev) 535 d = d->next; 536 if (!d) 537 goto drop_unlock; /* should never happen */ 538 539 /* Extract variable-width fields */ 540 sha = rarp_ptr; 541 rarp_ptr += dev->addr_len; 542 memcpy(&sip, rarp_ptr, 4); 543 rarp_ptr += 4; 544 tha = rarp_ptr; 545 rarp_ptr += dev->addr_len; 546 memcpy(&tip, rarp_ptr, 4); 547 548 /* Discard packets which are not meant for us. */ 549 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 550 goto drop_unlock; 551 552 /* Discard packets which are not from specified server. */ 553 if (ic_servaddr != NONE && ic_servaddr != sip) 554 goto drop_unlock; 555 556 /* We have a winner! */ 557 ic_dev = dev; 558 if (ic_myaddr == NONE) 559 ic_myaddr = tip; 560 ic_servaddr = sip; 561 ic_got_reply = IC_RARP; 562 563 drop_unlock: 564 /* Show's over. Nothing to see here. */ 565 spin_unlock(&ic_recv_lock); 566 567 drop: 568 /* Throw the packet out. */ 569 kfree_skb(skb); 570 return 0; 571 } 572 573 574 /* 575 * Send RARP request packet over a single interface. 576 */ 577 static void __init ic_rarp_send_if(struct ic_device *d) 578 { 579 struct net_device *dev = d->dev; 580 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 581 dev->dev_addr, dev->dev_addr); 582 } 583 #endif 584 585 /* 586 * DHCP/BOOTP support. 587 */ 588 589 #ifdef IPCONFIG_BOOTP 590 591 struct bootp_pkt { /* BOOTP packet format */ 592 struct iphdr iph; /* IP header */ 593 struct udphdr udph; /* UDP header */ 594 u8 op; /* 1=request, 2=reply */ 595 u8 htype; /* HW address type */ 596 u8 hlen; /* HW address length */ 597 u8 hops; /* Used only by gateways */ 598 __be32 xid; /* Transaction ID */ 599 __be16 secs; /* Seconds since we started */ 600 __be16 flags; /* Just what it says */ 601 __be32 client_ip; /* Client's IP address if known */ 602 __be32 your_ip; /* Assigned IP address */ 603 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 604 __be32 relay_ip; /* IP address of BOOTP relay */ 605 u8 hw_addr[16]; /* Client's HW address */ 606 u8 serv_name[64]; /* Server host name */ 607 u8 boot_file[128]; /* Name of boot file */ 608 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 609 }; 610 611 /* packet ops */ 612 #define BOOTP_REQUEST 1 613 #define BOOTP_REPLY 2 614 615 /* DHCP message types */ 616 #define DHCPDISCOVER 1 617 #define DHCPOFFER 2 618 #define DHCPREQUEST 3 619 #define DHCPDECLINE 4 620 #define DHCPACK 5 621 #define DHCPNAK 6 622 #define DHCPRELEASE 7 623 #define DHCPINFORM 8 624 625 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 626 627 static struct packet_type bootp_packet_type __initdata = { 628 .type = cpu_to_be16(ETH_P_IP), 629 .func = ic_bootp_recv, 630 }; 631 632 633 /* 634 * Initialize DHCP/BOOTP extension fields in the request. 635 */ 636 637 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 638 639 #ifdef IPCONFIG_DHCP 640 641 static void __init 642 ic_dhcp_init_options(u8 *options) 643 { 644 u8 mt = ((ic_servaddr == NONE) 645 ? DHCPDISCOVER : DHCPREQUEST); 646 u8 *e = options; 647 int len; 648 649 #ifdef IPCONFIG_DEBUG 650 printk("DHCP: Sending message type %d\n", mt); 651 #endif 652 653 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 654 e += 4; 655 656 *e++ = 53; /* DHCP message type */ 657 *e++ = 1; 658 *e++ = mt; 659 660 if (mt == DHCPREQUEST) { 661 *e++ = 54; /* Server ID (IP address) */ 662 *e++ = 4; 663 memcpy(e, &ic_servaddr, 4); 664 e += 4; 665 666 *e++ = 50; /* Requested IP address */ 667 *e++ = 4; 668 memcpy(e, &ic_myaddr, 4); 669 e += 4; 670 } 671 672 /* always? */ 673 { 674 static const u8 ic_req_params[] = { 675 1, /* Subnet mask */ 676 3, /* Default gateway */ 677 6, /* DNS server */ 678 12, /* Host name */ 679 15, /* Domain name */ 680 17, /* Boot path */ 681 26, /* MTU */ 682 40, /* NIS domain name */ 683 }; 684 685 *e++ = 55; /* Parameter request list */ 686 *e++ = sizeof(ic_req_params); 687 memcpy(e, ic_req_params, sizeof(ic_req_params)); 688 e += sizeof(ic_req_params); 689 690 if (ic_host_name_set) { 691 *e++ = 12; /* host-name */ 692 len = strlen(utsname()->nodename); 693 *e++ = len; 694 memcpy(e, utsname()->nodename, len); 695 e += len; 696 } 697 if (*vendor_class_identifier) { 698 pr_info("DHCP: sending class identifier \"%s\"\n", 699 vendor_class_identifier); 700 *e++ = 60; /* Class-identifier */ 701 len = strlen(vendor_class_identifier); 702 *e++ = len; 703 memcpy(e, vendor_class_identifier, len); 704 e += len; 705 } 706 } 707 708 *e++ = 255; /* End of the list */ 709 } 710 711 #endif /* IPCONFIG_DHCP */ 712 713 static void __init ic_bootp_init_ext(u8 *e) 714 { 715 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 716 e += 4; 717 *e++ = 1; /* Subnet mask request */ 718 *e++ = 4; 719 e += 4; 720 *e++ = 3; /* Default gateway request */ 721 *e++ = 4; 722 e += 4; 723 *e++ = 5; /* Name server request */ 724 *e++ = 8; 725 e += 8; 726 *e++ = 12; /* Host name request */ 727 *e++ = 32; 728 e += 32; 729 *e++ = 40; /* NIS Domain name request */ 730 *e++ = 32; 731 e += 32; 732 *e++ = 17; /* Boot path */ 733 *e++ = 40; 734 e += 40; 735 736 *e++ = 57; /* set extension buffer size for reply */ 737 *e++ = 2; 738 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 739 *e++ = 150; 740 741 *e++ = 255; /* End of the list */ 742 } 743 744 745 /* 746 * Initialize the DHCP/BOOTP mechanism. 747 */ 748 static inline void __init ic_bootp_init(void) 749 { 750 int i; 751 752 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 753 ic_nameservers[i] = NONE; 754 755 dev_add_pack(&bootp_packet_type); 756 } 757 758 759 /* 760 * DHCP/BOOTP cleanup. 761 */ 762 static inline void __init ic_bootp_cleanup(void) 763 { 764 dev_remove_pack(&bootp_packet_type); 765 } 766 767 768 /* 769 * Send DHCP/BOOTP request to single interface. 770 */ 771 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 772 { 773 struct net_device *dev = d->dev; 774 struct sk_buff *skb; 775 struct bootp_pkt *b; 776 struct iphdr *h; 777 int hlen = LL_RESERVED_SPACE(dev); 778 int tlen = dev->needed_tailroom; 779 780 /* Allocate packet */ 781 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, 782 GFP_KERNEL); 783 if (!skb) 784 return; 785 skb_reserve(skb, hlen); 786 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 787 memset(b, 0, sizeof(struct bootp_pkt)); 788 789 /* Construct IP header */ 790 skb_reset_network_header(skb); 791 h = ip_hdr(skb); 792 h->version = 4; 793 h->ihl = 5; 794 h->tot_len = htons(sizeof(struct bootp_pkt)); 795 h->frag_off = htons(IP_DF); 796 h->ttl = 64; 797 h->protocol = IPPROTO_UDP; 798 h->daddr = htonl(INADDR_BROADCAST); 799 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 800 801 /* Construct UDP header */ 802 b->udph.source = htons(68); 803 b->udph.dest = htons(67); 804 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 805 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 806 807 /* Construct DHCP/BOOTP header */ 808 b->op = BOOTP_REQUEST; 809 if (dev->type < 256) /* check for false types */ 810 b->htype = dev->type; 811 else if (dev->type == ARPHRD_FDDI) 812 b->htype = ARPHRD_ETHER; 813 else { 814 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 815 b->htype = dev->type; /* can cause undefined behavior */ 816 } 817 818 /* server_ip and your_ip address are both already zero per RFC2131 */ 819 b->hlen = dev->addr_len; 820 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 821 b->secs = htons(jiffies_diff / HZ); 822 b->xid = d->xid; 823 824 /* add DHCP options or BOOTP extensions */ 825 #ifdef IPCONFIG_DHCP 826 if (ic_proto_enabled & IC_USE_DHCP) 827 ic_dhcp_init_options(b->exten); 828 else 829 #endif 830 ic_bootp_init_ext(b->exten); 831 832 /* Chain packet down the line... */ 833 skb->dev = dev; 834 skb->protocol = htons(ETH_P_IP); 835 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 836 dev->broadcast, dev->dev_addr, skb->len) < 0) { 837 kfree_skb(skb); 838 printk("E"); 839 return; 840 } 841 842 if (dev_queue_xmit(skb) < 0) 843 printk("E"); 844 } 845 846 847 /* 848 * Copy BOOTP-supplied string if not already set. 849 */ 850 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 851 { 852 if (!len) 853 return 0; 854 if (len > max-1) 855 len = max-1; 856 memcpy(dest, src, len); 857 dest[len] = '\0'; 858 return 1; 859 } 860 861 862 /* 863 * Process BOOTP extensions. 864 */ 865 static void __init ic_do_bootp_ext(u8 *ext) 866 { 867 u8 servers; 868 int i; 869 __be16 mtu; 870 871 #ifdef IPCONFIG_DEBUG 872 u8 *c; 873 874 printk("DHCP/BOOTP: Got extension %d:",*ext); 875 for (c=ext+2; c<ext+2+ext[1]; c++) 876 printk(" %02x", *c); 877 printk("\n"); 878 #endif 879 880 switch (*ext++) { 881 case 1: /* Subnet mask */ 882 if (ic_netmask == NONE) 883 memcpy(&ic_netmask, ext+1, 4); 884 break; 885 case 3: /* Default gateway */ 886 if (ic_gateway == NONE) 887 memcpy(&ic_gateway, ext+1, 4); 888 break; 889 case 6: /* DNS server */ 890 servers= *ext/4; 891 if (servers > CONF_NAMESERVERS_MAX) 892 servers = CONF_NAMESERVERS_MAX; 893 for (i = 0; i < servers; i++) { 894 if (ic_nameservers[i] == NONE) 895 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 896 } 897 break; 898 case 12: /* Host name */ 899 ic_bootp_string(utsname()->nodename, ext+1, *ext, 900 __NEW_UTS_LEN); 901 ic_host_name_set = 1; 902 break; 903 case 15: /* Domain name (DNS) */ 904 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 905 break; 906 case 17: /* Root path */ 907 if (!root_server_path[0]) 908 ic_bootp_string(root_server_path, ext+1, *ext, 909 sizeof(root_server_path)); 910 break; 911 case 26: /* Interface MTU */ 912 memcpy(&mtu, ext+1, sizeof(mtu)); 913 ic_dev_mtu = ntohs(mtu); 914 break; 915 case 40: /* NIS Domain name (_not_ DNS) */ 916 ic_bootp_string(utsname()->domainname, ext+1, *ext, 917 __NEW_UTS_LEN); 918 break; 919 } 920 } 921 922 923 /* 924 * Receive BOOTP reply. 925 */ 926 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 927 { 928 struct bootp_pkt *b; 929 struct iphdr *h; 930 struct ic_device *d; 931 int len, ext_len; 932 933 if (!net_eq(dev_net(dev), &init_net)) 934 goto drop; 935 936 /* Perform verifications before taking the lock. */ 937 if (skb->pkt_type == PACKET_OTHERHOST) 938 goto drop; 939 940 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 941 return NET_RX_DROP; 942 943 if (!pskb_may_pull(skb, 944 sizeof(struct iphdr) + 945 sizeof(struct udphdr))) 946 goto drop; 947 948 b = (struct bootp_pkt *)skb_network_header(skb); 949 h = &b->iph; 950 951 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 952 goto drop; 953 954 /* Fragments are not supported */ 955 if (ip_is_fragment(h)) { 956 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); 957 goto drop; 958 } 959 960 if (skb->len < ntohs(h->tot_len)) 961 goto drop; 962 963 if (ip_fast_csum((char *) h, h->ihl)) 964 goto drop; 965 966 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 967 goto drop; 968 969 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 970 goto drop; 971 972 len = ntohs(b->udph.len) - sizeof(struct udphdr); 973 ext_len = len - (sizeof(*b) - 974 sizeof(struct iphdr) - 975 sizeof(struct udphdr) - 976 sizeof(b->exten)); 977 if (ext_len < 0) 978 goto drop; 979 980 /* Ok the front looks good, make sure we can get at the rest. */ 981 if (!pskb_may_pull(skb, skb->len)) 982 goto drop; 983 984 b = (struct bootp_pkt *)skb_network_header(skb); 985 h = &b->iph; 986 987 /* One reply at a time, please. */ 988 spin_lock(&ic_recv_lock); 989 990 /* If we already have a reply, just drop the packet */ 991 if (ic_got_reply) 992 goto drop_unlock; 993 994 /* Find the ic_device that the packet arrived on */ 995 d = ic_first_dev; 996 while (d && d->dev != dev) 997 d = d->next; 998 if (!d) 999 goto drop_unlock; /* should never happen */ 1000 1001 /* Is it a reply to our BOOTP request? */ 1002 if (b->op != BOOTP_REPLY || 1003 b->xid != d->xid) { 1004 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n", 1005 b->op, b->xid); 1006 goto drop_unlock; 1007 } 1008 1009 /* Is it a reply for the device we are configuring? */ 1010 if (b->xid != ic_dev_xid) { 1011 net_err_ratelimited("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 pr_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 pr_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 pr_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 pr_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 int) 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 pr_cont(","); 1220 continue; 1221 } 1222 #endif /* IPCONFIG_DHCP */ 1223 1224 if (ic_got_reply) { 1225 pr_cont(" OK\n"); 1226 break; 1227 } 1228 1229 if ((d = d->next)) 1230 continue; 1231 1232 if (! --retries) { 1233 pr_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 pr_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 pr_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 pr_err("IP-Config: Retrying forever (NFS root)...\n"); 1441 goto try_try_again; 1442 } 1443 #endif 1444 1445 if (--retries) { 1446 pr_err("IP-Config: Reopening network devices...\n"); 1447 goto try_try_again; 1448 } 1449 1450 /* Oh, well. At least we tried. */ 1451 pr_err("IP-Config: Auto-configuration of network failed\n"); 1452 return -1; 1453 } 1454 #else /* !DYNAMIC */ 1455 pr_err("IP-Config: Incomplete network configuration information\n"); 1456 ic_close_devs(); 1457 return -1; 1458 #endif /* IPCONFIG_DYNAMIC */ 1459 } else { 1460 /* Device selected manually or only one device -> use it */ 1461 ic_dev = ic_first_dev->dev; 1462 } 1463 1464 addr = root_nfs_parse_addr(root_server_path); 1465 if (root_server_addr == NONE) 1466 root_server_addr = addr; 1467 1468 /* 1469 * Use defaults wherever applicable. 1470 */ 1471 if (ic_defaults() < 0) 1472 return -1; 1473 1474 /* 1475 * Close all network devices except the device we've 1476 * autoconfigured and set up routes. 1477 */ 1478 ic_close_devs(); 1479 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1480 return -1; 1481 1482 /* 1483 * Record which protocol was actually used. 1484 */ 1485 #ifdef IPCONFIG_DYNAMIC 1486 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1487 #endif 1488 1489 #ifndef IPCONFIG_SILENT 1490 /* 1491 * Clue in the operator. 1492 */ 1493 pr_info("IP-Config: Complete:\n"); 1494 pr_info(" device=%s, addr=%pI4, mask=%pI4, gw=%pI4\n", 1495 ic_dev->name, &ic_myaddr, &ic_netmask, &ic_gateway); 1496 pr_info(" host=%s, domain=%s, nis-domain=%s\n", 1497 utsname()->nodename, ic_domain, utsname()->domainname); 1498 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", 1499 &ic_servaddr, &root_server_addr, root_server_path); 1500 if (ic_dev_mtu) 1501 pr_cont(", mtu=%d", ic_dev_mtu); 1502 pr_cont("\n"); 1503 #endif /* !SILENT */ 1504 1505 return 0; 1506 } 1507 1508 late_initcall(ip_auto_config); 1509 1510 1511 /* 1512 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1513 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. 1514 */ 1515 static int __init ic_proto_name(char *name) 1516 { 1517 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1518 return 1; 1519 } 1520 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1521 return 0; 1522 } 1523 #ifdef CONFIG_IP_PNP_DHCP 1524 else if (!strcmp(name, "dhcp")) { 1525 ic_proto_enabled &= ~IC_RARP; 1526 return 1; 1527 } 1528 #endif 1529 #ifdef CONFIG_IP_PNP_BOOTP 1530 else if (!strcmp(name, "bootp")) { 1531 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1532 return 1; 1533 } 1534 #endif 1535 #ifdef CONFIG_IP_PNP_RARP 1536 else if (!strcmp(name, "rarp")) { 1537 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1538 return 1; 1539 } 1540 #endif 1541 #ifdef IPCONFIG_DYNAMIC 1542 else if (!strcmp(name, "both")) { 1543 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1544 return 1; 1545 } 1546 #endif 1547 return 0; 1548 } 1549 1550 static int __init ip_auto_config_setup(char *addrs) 1551 { 1552 char *cp, *ip, *dp; 1553 int num = 0; 1554 1555 ic_set_manually = 1; 1556 ic_enable = 1; 1557 1558 /* 1559 * If any dhcp, bootp etc options are set, leave autoconfig on 1560 * and skip the below static IP processing. 1561 */ 1562 if (ic_proto_name(addrs)) 1563 return 1; 1564 1565 /* If no static IP is given, turn off autoconfig and bail. */ 1566 if (*addrs == 0 || 1567 strcmp(addrs, "off") == 0 || 1568 strcmp(addrs, "none") == 0) { 1569 ic_enable = 0; 1570 return 1; 1571 } 1572 1573 /* Parse string for static IP assignment. */ 1574 ip = addrs; 1575 while (ip && *ip) { 1576 if ((cp = strchr(ip, ':'))) 1577 *cp++ = '\0'; 1578 if (strlen(ip) > 0) { 1579 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); 1580 switch (num) { 1581 case 0: 1582 if ((ic_myaddr = in_aton(ip)) == ANY) 1583 ic_myaddr = NONE; 1584 break; 1585 case 1: 1586 if ((ic_servaddr = in_aton(ip)) == ANY) 1587 ic_servaddr = NONE; 1588 break; 1589 case 2: 1590 if ((ic_gateway = in_aton(ip)) == ANY) 1591 ic_gateway = NONE; 1592 break; 1593 case 3: 1594 if ((ic_netmask = in_aton(ip)) == ANY) 1595 ic_netmask = NONE; 1596 break; 1597 case 4: 1598 if ((dp = strchr(ip, '.'))) { 1599 *dp++ = '\0'; 1600 strlcpy(utsname()->domainname, dp, 1601 sizeof(utsname()->domainname)); 1602 } 1603 strlcpy(utsname()->nodename, ip, 1604 sizeof(utsname()->nodename)); 1605 ic_host_name_set = 1; 1606 break; 1607 case 5: 1608 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1609 break; 1610 case 6: 1611 if (ic_proto_name(ip) == 0 && 1612 ic_myaddr == NONE) { 1613 ic_enable = 0; 1614 } 1615 break; 1616 } 1617 } 1618 ip = cp; 1619 num++; 1620 } 1621 1622 return 1; 1623 } 1624 __setup("ip=", ip_auto_config_setup); 1625 1626 static int __init nfsaddrs_config_setup(char *addrs) 1627 { 1628 return ip_auto_config_setup(addrs); 1629 } 1630 __setup("nfsaddrs=", nfsaddrs_config_setup); 1631 1632 static int __init vendor_class_identifier_setup(char *addrs) 1633 { 1634 if (strlcpy(vendor_class_identifier, addrs, 1635 sizeof(vendor_class_identifier)) 1636 >= sizeof(vendor_class_identifier)) 1637 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"", 1638 vendor_class_identifier); 1639 return 1; 1640 } 1641 __setup("dhcpclass=", vendor_class_identifier_setup); 1642