1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or 4 * user-supplied information to configure own IP address and routes. 5 * 6 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz> 7 * 8 * Derived from network configuration code in fs/nfs/nfsroot.c, 9 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me. 10 * 11 * BOOTP rewritten to construct and analyse packets itself instead 12 * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--; 13 * -- MJ, December 1998 14 * 15 * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic" 16 * initialization scheme. 17 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999 18 * 19 * DHCP support added. To users this looks like a whole separate 20 * protocol, but we know it's just a bag on the side of BOOTP. 21 * -- Chip Salzenberg <chip@valinux.com>, May 2000 22 * 23 * Ported DHCP support from 2.2.16 to 2.4.0-test4 24 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000 25 * 26 * Merged changes from 2.2.19 into 2.4.3 27 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001 28 * 29 * Multiple Nameservers in /proc/net/pnp 30 * -- Josef Siemes <jsiemes@web.de>, Aug 2002 31 */ 32 33 #include <linux/types.h> 34 #include <linux/string.h> 35 #include <linux/kernel.h> 36 #include <linux/jiffies.h> 37 #include <linux/random.h> 38 #include <linux/init.h> 39 #include <linux/utsname.h> 40 #include <linux/in.h> 41 #include <linux/if.h> 42 #include <linux/inet.h> 43 #include <linux/inetdevice.h> 44 #include <linux/netdevice.h> 45 #include <linux/if_arp.h> 46 #include <linux/skbuff.h> 47 #include <linux/ip.h> 48 #include <linux/socket.h> 49 #include <linux/route.h> 50 #include <linux/udp.h> 51 #include <linux/proc_fs.h> 52 #include <linux/seq_file.h> 53 #include <linux/major.h> 54 #include <linux/root_dev.h> 55 #include <linux/delay.h> 56 #include <linux/nfs_fs.h> 57 #include <linux/slab.h> 58 #include <linux/export.h> 59 #include <net/net_namespace.h> 60 #include <net/arp.h> 61 #include <net/dsa.h> 62 #include <net/ip.h> 63 #include <net/ipconfig.h> 64 #include <net/route.h> 65 66 #include <linux/uaccess.h> 67 #include <net/checksum.h> 68 #include <asm/processor.h> 69 70 #if defined(CONFIG_IP_PNP_DHCP) 71 #define IPCONFIG_DHCP 72 #endif 73 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) 74 #define IPCONFIG_BOOTP 75 #endif 76 #if defined(CONFIG_IP_PNP_RARP) 77 #define IPCONFIG_RARP 78 #endif 79 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) 80 #define IPCONFIG_DYNAMIC 81 #endif 82 83 /* Define the friendly delay before and after opening net devices */ 84 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */ 85 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */ 86 87 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ 88 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ 89 #define CONF_SEND_RETRIES 6 /* Send six requests per open */ 90 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ 91 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ 92 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ 93 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ 94 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers 95 - '3' from resolv.h */ 96 97 #define NONE cpu_to_be32(INADDR_NONE) 98 #define ANY cpu_to_be32(INADDR_ANY) 99 100 /* 101 * Public IP configuration 102 */ 103 104 /* This is used by platforms which might be able to set the ipconfig 105 * variables using firmware environment vars. If this is set, it will 106 * ignore such firmware variables. 107 */ 108 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ 109 110 static int ic_enable __initdata; /* IP config enabled? */ 111 112 /* Protocol choice */ 113 int ic_proto_enabled __initdata = 0 114 #ifdef IPCONFIG_BOOTP 115 | IC_BOOTP 116 #endif 117 #ifdef CONFIG_IP_PNP_DHCP 118 | IC_USE_DHCP 119 #endif 120 #ifdef IPCONFIG_RARP 121 | IC_RARP 122 #endif 123 ; 124 125 static int ic_host_name_set __initdata; /* Host name set by us? */ 126 127 __be32 ic_myaddr = NONE; /* My IP address */ 128 static __be32 ic_netmask = NONE; /* Netmask for local subnet */ 129 __be32 ic_gateway = NONE; /* Gateway IP address */ 130 131 #ifdef IPCONFIG_DYNAMIC 132 static __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */ 133 #endif 134 135 __be32 ic_servaddr = NONE; /* Boot server IP address */ 136 137 __be32 root_server_addr = NONE; /* Address of NFS server */ 138 u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 139 140 /* vendor class identifier */ 141 static char vendor_class_identifier[253] __initdata; 142 143 #if defined(CONFIG_IP_PNP_DHCP) 144 static char dhcp_client_identifier[253] __initdata; 145 #endif 146 147 /* Persistent data: */ 148 149 #ifdef IPCONFIG_DYNAMIC 150 static int ic_proto_used; /* Protocol used, if any */ 151 #else 152 #define ic_proto_used 0 153 #endif 154 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 155 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 156 157 /* 158 * Private state. 159 */ 160 161 /* Name of user-selected boot device */ 162 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 163 164 /* Protocols supported by available interfaces */ 165 static int ic_proto_have_if __initdata; 166 167 /* MTU for boot device */ 168 static int ic_dev_mtu __initdata; 169 170 #ifdef IPCONFIG_DYNAMIC 171 static DEFINE_SPINLOCK(ic_recv_lock); 172 static volatile int ic_got_reply __initdata; /* Proto(s) that replied */ 173 #endif 174 #ifdef IPCONFIG_DHCP 175 static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */ 176 #endif 177 178 179 /* 180 * Network devices 181 */ 182 183 struct ic_device { 184 struct ic_device *next; 185 struct net_device *dev; 186 unsigned short flags; 187 short able; 188 __be32 xid; 189 }; 190 191 static struct ic_device *ic_first_dev __initdata; /* List of open device */ 192 static struct ic_device *ic_dev __initdata; /* Selected device */ 193 194 static bool __init ic_is_init_dev(struct net_device *dev) 195 { 196 if (dev->flags & IFF_LOOPBACK) 197 return false; 198 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 199 (!(dev->flags & IFF_LOOPBACK) && 200 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 201 strncmp(dev->name, "dummy", 5)); 202 } 203 204 static int __init ic_open_devs(void) 205 { 206 struct ic_device *d, **last; 207 struct net_device *dev; 208 unsigned short oflags; 209 unsigned long start, next_msg; 210 211 last = &ic_first_dev; 212 rtnl_lock(); 213 214 /* bring loopback and DSA master network devices up first */ 215 for_each_netdev(&init_net, dev) { 216 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev)) 217 continue; 218 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) 219 pr_err("IP-Config: Failed to open %s\n", dev->name); 220 } 221 222 for_each_netdev(&init_net, dev) { 223 if (ic_is_init_dev(dev)) { 224 int able = 0; 225 if (dev->mtu >= 364) 226 able |= IC_BOOTP; 227 else 228 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n", 229 dev->name, dev->mtu); 230 if (!(dev->flags & IFF_NOARP)) 231 able |= IC_RARP; 232 able &= ic_proto_enabled; 233 if (ic_proto_enabled && !able) 234 continue; 235 oflags = dev->flags; 236 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 237 pr_err("IP-Config: Failed to open %s\n", 238 dev->name); 239 continue; 240 } 241 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 242 rtnl_unlock(); 243 return -ENOMEM; 244 } 245 d->dev = dev; 246 *last = d; 247 last = &d->next; 248 d->flags = oflags; 249 d->able = able; 250 if (able & IC_BOOTP) 251 get_random_bytes(&d->xid, sizeof(__be32)); 252 else 253 d->xid = 0; 254 ic_proto_have_if |= able; 255 pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n", 256 dev->name, able, d->xid); 257 } 258 } 259 260 /* no point in waiting if we could not bring up at least one device */ 261 if (!ic_first_dev) 262 goto have_carrier; 263 264 /* wait for a carrier on at least one device */ 265 start = jiffies; 266 next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12); 267 while (time_before(jiffies, start + 268 msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) { 269 int wait, elapsed; 270 271 for_each_netdev(&init_net, dev) 272 if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) 273 goto have_carrier; 274 275 msleep(1); 276 277 if (time_before(jiffies, next_msg)) 278 continue; 279 280 elapsed = jiffies_to_msecs(jiffies - start); 281 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000; 282 pr_info("Waiting up to %d more seconds for network.\n", wait); 283 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12); 284 } 285 have_carrier: 286 rtnl_unlock(); 287 288 *last = NULL; 289 290 if (!ic_first_dev) { 291 if (user_dev_name[0]) 292 pr_err("IP-Config: Device `%s' not found\n", 293 user_dev_name); 294 else 295 pr_err("IP-Config: No network devices available\n"); 296 return -ENODEV; 297 } 298 return 0; 299 } 300 301 static void __init ic_close_devs(void) 302 { 303 struct ic_device *d, *next; 304 struct net_device *dev; 305 306 rtnl_lock(); 307 next = ic_first_dev; 308 while ((d = next)) { 309 next = d->next; 310 dev = d->dev; 311 if (d != ic_dev && !netdev_uses_dsa(dev)) { 312 pr_debug("IP-Config: Downing %s\n", dev->name); 313 dev_change_flags(dev, d->flags); 314 } 315 kfree(d); 316 } 317 rtnl_unlock(); 318 } 319 320 /* 321 * Interface to various network functions. 322 */ 323 324 static inline void 325 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 326 { 327 sin->sin_family = AF_INET; 328 sin->sin_addr.s_addr = addr; 329 sin->sin_port = port; 330 } 331 332 /* 333 * Set up interface addresses and routes. 334 */ 335 336 static int __init ic_setup_if(void) 337 { 338 struct ifreq ir; 339 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 340 int err; 341 342 memset(&ir, 0, sizeof(ir)); 343 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name); 344 set_sockaddr(sin, ic_myaddr, 0); 345 if ((err = devinet_ioctl(&init_net, SIOCSIFADDR, &ir)) < 0) { 346 pr_err("IP-Config: Unable to set interface address (%d)\n", 347 err); 348 return -1; 349 } 350 set_sockaddr(sin, ic_netmask, 0); 351 if ((err = devinet_ioctl(&init_net, SIOCSIFNETMASK, &ir)) < 0) { 352 pr_err("IP-Config: Unable to set interface netmask (%d)\n", 353 err); 354 return -1; 355 } 356 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 357 if ((err = devinet_ioctl(&init_net, SIOCSIFBRDADDR, &ir)) < 0) { 358 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n", 359 err); 360 return -1; 361 } 362 /* Handle the case where we need non-standard MTU on the boot link (a network 363 * using jumbo frames, for instance). If we can't set the mtu, don't error 364 * out, we'll try to muddle along. 365 */ 366 if (ic_dev_mtu != 0) { 367 rtnl_lock(); 368 if ((err = dev_set_mtu(ic_dev->dev, ic_dev_mtu)) < 0) 369 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", 370 ic_dev_mtu, err); 371 rtnl_unlock(); 372 } 373 return 0; 374 } 375 376 static int __init ic_setup_routes(void) 377 { 378 /* No need to setup device routes, only the default route... */ 379 380 if (ic_gateway != NONE) { 381 struct rtentry rm; 382 int err; 383 384 memset(&rm, 0, sizeof(rm)); 385 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 386 pr_err("IP-Config: Gateway not on directly connected network\n"); 387 return -1; 388 } 389 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 390 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 391 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 392 rm.rt_flags = RTF_UP | RTF_GATEWAY; 393 if ((err = ip_rt_ioctl(&init_net, SIOCADDRT, &rm)) < 0) { 394 pr_err("IP-Config: Cannot add default route (%d)\n", 395 err); 396 return -1; 397 } 398 } 399 400 return 0; 401 } 402 403 /* 404 * Fill in default values for all missing parameters. 405 */ 406 407 static int __init ic_defaults(void) 408 { 409 /* 410 * At this point we have no userspace running so need not 411 * claim locks on system_utsname 412 */ 413 414 if (!ic_host_name_set) 415 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 416 417 if (root_server_addr == NONE) 418 root_server_addr = ic_servaddr; 419 420 if (ic_netmask == NONE) { 421 if (IN_CLASSA(ntohl(ic_myaddr))) 422 ic_netmask = htonl(IN_CLASSA_NET); 423 else if (IN_CLASSB(ntohl(ic_myaddr))) 424 ic_netmask = htonl(IN_CLASSB_NET); 425 else if (IN_CLASSC(ntohl(ic_myaddr))) 426 ic_netmask = htonl(IN_CLASSC_NET); 427 else { 428 pr_err("IP-Config: Unable to guess netmask for address %pI4\n", 429 &ic_myaddr); 430 return -1; 431 } 432 pr_notice("IP-Config: Guessing netmask %pI4\n", 433 &ic_netmask); 434 } 435 436 return 0; 437 } 438 439 /* 440 * RARP support. 441 */ 442 443 #ifdef IPCONFIG_RARP 444 445 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 446 447 static struct packet_type rarp_packet_type __initdata = { 448 .type = cpu_to_be16(ETH_P_RARP), 449 .func = ic_rarp_recv, 450 }; 451 452 static inline void __init ic_rarp_init(void) 453 { 454 dev_add_pack(&rarp_packet_type); 455 } 456 457 static inline void __init ic_rarp_cleanup(void) 458 { 459 dev_remove_pack(&rarp_packet_type); 460 } 461 462 /* 463 * Process received RARP packet. 464 */ 465 static int __init 466 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 467 { 468 struct arphdr *rarp; 469 unsigned char *rarp_ptr; 470 __be32 sip, tip; 471 unsigned char *tha; /* t for "target" */ 472 struct ic_device *d; 473 474 if (!net_eq(dev_net(dev), &init_net)) 475 goto drop; 476 477 skb = skb_share_check(skb, GFP_ATOMIC); 478 if (!skb) 479 return NET_RX_DROP; 480 481 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 482 goto drop; 483 484 /* Basic sanity checks can be done without the lock. */ 485 rarp = (struct arphdr *)skb_transport_header(skb); 486 487 /* If this test doesn't pass, it's not IP, or we should 488 * ignore it anyway. 489 */ 490 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 491 goto drop; 492 493 /* If it's not a RARP reply, delete it. */ 494 if (rarp->ar_op != htons(ARPOP_RREPLY)) 495 goto drop; 496 497 /* If it's not Ethernet, delete it. */ 498 if (rarp->ar_pro != htons(ETH_P_IP)) 499 goto drop; 500 501 if (!pskb_may_pull(skb, arp_hdr_len(dev))) 502 goto drop; 503 504 /* OK, it is all there and looks valid, process... */ 505 rarp = (struct arphdr *)skb_transport_header(skb); 506 rarp_ptr = (unsigned char *) (rarp + 1); 507 508 /* One reply at a time, please. */ 509 spin_lock(&ic_recv_lock); 510 511 /* If we already have a reply, just drop the packet */ 512 if (ic_got_reply) 513 goto drop_unlock; 514 515 /* Find the ic_device that the packet arrived on */ 516 d = ic_first_dev; 517 while (d && d->dev != dev) 518 d = d->next; 519 if (!d) 520 goto drop_unlock; /* should never happen */ 521 522 /* Extract variable-width fields */ 523 rarp_ptr += dev->addr_len; 524 memcpy(&sip, rarp_ptr, 4); 525 rarp_ptr += 4; 526 tha = rarp_ptr; 527 rarp_ptr += dev->addr_len; 528 memcpy(&tip, rarp_ptr, 4); 529 530 /* Discard packets which are not meant for us. */ 531 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 532 goto drop_unlock; 533 534 /* Discard packets which are not from specified server. */ 535 if (ic_servaddr != NONE && ic_servaddr != sip) 536 goto drop_unlock; 537 538 /* We have a winner! */ 539 ic_dev = d; 540 if (ic_myaddr == NONE) 541 ic_myaddr = tip; 542 ic_servaddr = sip; 543 ic_addrservaddr = sip; 544 ic_got_reply = IC_RARP; 545 546 drop_unlock: 547 /* Show's over. Nothing to see here. */ 548 spin_unlock(&ic_recv_lock); 549 550 drop: 551 /* Throw the packet out. */ 552 kfree_skb(skb); 553 return 0; 554 } 555 556 557 /* 558 * Send RARP request packet over a single interface. 559 */ 560 static void __init ic_rarp_send_if(struct ic_device *d) 561 { 562 struct net_device *dev = d->dev; 563 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 564 dev->dev_addr, dev->dev_addr); 565 } 566 #endif 567 568 /* 569 * Predefine Nameservers 570 */ 571 static inline void __init ic_nameservers_predef(void) 572 { 573 int i; 574 575 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 576 ic_nameservers[i] = NONE; 577 } 578 579 /* 580 * DHCP/BOOTP support. 581 */ 582 583 #ifdef IPCONFIG_BOOTP 584 585 struct bootp_pkt { /* BOOTP packet format */ 586 struct iphdr iph; /* IP header */ 587 struct udphdr udph; /* UDP header */ 588 u8 op; /* 1=request, 2=reply */ 589 u8 htype; /* HW address type */ 590 u8 hlen; /* HW address length */ 591 u8 hops; /* Used only by gateways */ 592 __be32 xid; /* Transaction ID */ 593 __be16 secs; /* Seconds since we started */ 594 __be16 flags; /* Just what it says */ 595 __be32 client_ip; /* Client's IP address if known */ 596 __be32 your_ip; /* Assigned IP address */ 597 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 598 __be32 relay_ip; /* IP address of BOOTP relay */ 599 u8 hw_addr[16]; /* Client's HW address */ 600 u8 serv_name[64]; /* Server host name */ 601 u8 boot_file[128]; /* Name of boot file */ 602 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 603 }; 604 605 /* packet ops */ 606 #define BOOTP_REQUEST 1 607 #define BOOTP_REPLY 2 608 609 /* DHCP message types */ 610 #define DHCPDISCOVER 1 611 #define DHCPOFFER 2 612 #define DHCPREQUEST 3 613 #define DHCPDECLINE 4 614 #define DHCPACK 5 615 #define DHCPNAK 6 616 #define DHCPRELEASE 7 617 #define DHCPINFORM 8 618 619 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 620 621 static struct packet_type bootp_packet_type __initdata = { 622 .type = cpu_to_be16(ETH_P_IP), 623 .func = ic_bootp_recv, 624 }; 625 626 /* 627 * Initialize DHCP/BOOTP extension fields in the request. 628 */ 629 630 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 631 632 #ifdef IPCONFIG_DHCP 633 634 static void __init 635 ic_dhcp_init_options(u8 *options, struct ic_device *d) 636 { 637 u8 mt = ((ic_servaddr == NONE) 638 ? DHCPDISCOVER : DHCPREQUEST); 639 u8 *e = options; 640 int len; 641 642 pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name); 643 644 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 645 e += 4; 646 647 *e++ = 53; /* DHCP message type */ 648 *e++ = 1; 649 *e++ = mt; 650 651 if (mt == DHCPREQUEST) { 652 *e++ = 54; /* Server ID (IP address) */ 653 *e++ = 4; 654 memcpy(e, &ic_servaddr, 4); 655 e += 4; 656 657 *e++ = 50; /* Requested IP address */ 658 *e++ = 4; 659 memcpy(e, &ic_myaddr, 4); 660 e += 4; 661 } 662 663 /* always? */ 664 { 665 static const u8 ic_req_params[] = { 666 1, /* Subnet mask */ 667 3, /* Default gateway */ 668 6, /* DNS server */ 669 12, /* Host name */ 670 15, /* Domain name */ 671 17, /* Boot path */ 672 26, /* MTU */ 673 40, /* NIS domain name */ 674 }; 675 676 *e++ = 55; /* Parameter request list */ 677 *e++ = sizeof(ic_req_params); 678 memcpy(e, ic_req_params, sizeof(ic_req_params)); 679 e += sizeof(ic_req_params); 680 681 if (ic_host_name_set) { 682 *e++ = 12; /* host-name */ 683 len = strlen(utsname()->nodename); 684 *e++ = len; 685 memcpy(e, utsname()->nodename, len); 686 e += len; 687 } 688 if (*vendor_class_identifier) { 689 pr_info("DHCP: sending class identifier \"%s\"\n", 690 vendor_class_identifier); 691 *e++ = 60; /* Class-identifier */ 692 len = strlen(vendor_class_identifier); 693 *e++ = len; 694 memcpy(e, vendor_class_identifier, len); 695 e += len; 696 } 697 len = strlen(dhcp_client_identifier + 1); 698 /* the minimum length of identifier is 2, include 1 byte type, 699 * and can not be larger than the length of options 700 */ 701 if (len >= 1 && len < 312 - (e - options) - 1) { 702 *e++ = 61; 703 *e++ = len + 1; 704 memcpy(e, dhcp_client_identifier, len + 1); 705 e += len + 1; 706 } 707 } 708 709 *e++ = 255; /* End of the list */ 710 } 711 712 #endif /* IPCONFIG_DHCP */ 713 714 static void __init ic_bootp_init_ext(u8 *e) 715 { 716 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 717 e += 4; 718 *e++ = 1; /* Subnet mask request */ 719 *e++ = 4; 720 e += 4; 721 *e++ = 3; /* Default gateway request */ 722 *e++ = 4; 723 e += 4; 724 *e++ = 5; /* Name server request */ 725 *e++ = 8; 726 e += 8; 727 *e++ = 12; /* Host name request */ 728 *e++ = 32; 729 e += 32; 730 *e++ = 40; /* NIS Domain name request */ 731 *e++ = 32; 732 e += 32; 733 *e++ = 17; /* Boot path */ 734 *e++ = 40; 735 e += 40; 736 737 *e++ = 57; /* set extension buffer size for reply */ 738 *e++ = 2; 739 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 740 *e++ = 150; 741 742 *e++ = 255; /* End of the list */ 743 } 744 745 746 /* 747 * Initialize the DHCP/BOOTP mechanism. 748 */ 749 static inline void __init ic_bootp_init(void) 750 { 751 ic_nameservers_predef(); 752 753 dev_add_pack(&bootp_packet_type); 754 } 755 756 757 /* 758 * DHCP/BOOTP cleanup. 759 */ 760 static inline void __init ic_bootp_cleanup(void) 761 { 762 dev_remove_pack(&bootp_packet_type); 763 } 764 765 766 /* 767 * Send DHCP/BOOTP request to single interface. 768 */ 769 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 770 { 771 struct net_device *dev = d->dev; 772 struct sk_buff *skb; 773 struct bootp_pkt *b; 774 struct iphdr *h; 775 int hlen = LL_RESERVED_SPACE(dev); 776 int tlen = dev->needed_tailroom; 777 778 /* Allocate packet */ 779 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, 780 GFP_KERNEL); 781 if (!skb) 782 return; 783 skb_reserve(skb, hlen); 784 b = skb_put_zero(skb, sizeof(struct bootp_pkt)); 785 786 /* Construct IP header */ 787 skb_reset_network_header(skb); 788 h = ip_hdr(skb); 789 h->version = 4; 790 h->ihl = 5; 791 h->tot_len = htons(sizeof(struct bootp_pkt)); 792 h->frag_off = htons(IP_DF); 793 h->ttl = 64; 794 h->protocol = IPPROTO_UDP; 795 h->daddr = htonl(INADDR_BROADCAST); 796 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 797 798 /* Construct UDP header */ 799 b->udph.source = htons(68); 800 b->udph.dest = htons(67); 801 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 802 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 803 804 /* Construct DHCP/BOOTP header */ 805 b->op = BOOTP_REQUEST; 806 if (dev->type < 256) /* check for false types */ 807 b->htype = dev->type; 808 else if (dev->type == ARPHRD_FDDI) 809 b->htype = ARPHRD_ETHER; 810 else { 811 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type, 812 dev->name); 813 b->htype = dev->type; /* can cause undefined behavior */ 814 } 815 816 /* server_ip and your_ip address are both already zero per RFC2131 */ 817 b->hlen = dev->addr_len; 818 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 819 b->secs = htons(jiffies_diff / HZ); 820 b->xid = d->xid; 821 822 /* add DHCP options or BOOTP extensions */ 823 #ifdef IPCONFIG_DHCP 824 if (ic_proto_enabled & IC_USE_DHCP) 825 ic_dhcp_init_options(b->exten, d); 826 else 827 #endif 828 ic_bootp_init_ext(b->exten); 829 830 /* Chain packet down the line... */ 831 skb->dev = dev; 832 skb->protocol = htons(ETH_P_IP); 833 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 834 dev->broadcast, dev->dev_addr, skb->len) < 0) { 835 kfree_skb(skb); 836 printk("E"); 837 return; 838 } 839 840 if (dev_queue_xmit(skb) < 0) 841 printk("E"); 842 } 843 844 845 /* 846 * Copy BOOTP-supplied string if not already set. 847 */ 848 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 849 { 850 if (!len) 851 return 0; 852 if (len > max-1) 853 len = max-1; 854 memcpy(dest, src, len); 855 dest[len] = '\0'; 856 return 1; 857 } 858 859 860 /* 861 * Process BOOTP extensions. 862 */ 863 static void __init ic_do_bootp_ext(u8 *ext) 864 { 865 u8 servers; 866 int i; 867 __be16 mtu; 868 869 u8 *c; 870 871 pr_debug("DHCP/BOOTP: Got extension %d:", *ext); 872 for (c=ext+2; c<ext+2+ext[1]; c++) 873 pr_debug(" %02x", *c); 874 pr_debug("\n"); 875 876 switch (*ext++) { 877 case 1: /* Subnet mask */ 878 if (ic_netmask == NONE) 879 memcpy(&ic_netmask, ext+1, 4); 880 break; 881 case 3: /* Default gateway */ 882 if (ic_gateway == NONE) 883 memcpy(&ic_gateway, ext+1, 4); 884 break; 885 case 6: /* DNS server */ 886 servers= *ext/4; 887 if (servers > CONF_NAMESERVERS_MAX) 888 servers = CONF_NAMESERVERS_MAX; 889 for (i = 0; i < servers; i++) { 890 if (ic_nameservers[i] == NONE) 891 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 892 } 893 break; 894 case 12: /* Host name */ 895 ic_bootp_string(utsname()->nodename, ext+1, *ext, 896 __NEW_UTS_LEN); 897 ic_host_name_set = 1; 898 break; 899 case 15: /* Domain name (DNS) */ 900 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 901 break; 902 case 17: /* Root path */ 903 if (!root_server_path[0]) 904 ic_bootp_string(root_server_path, ext+1, *ext, 905 sizeof(root_server_path)); 906 break; 907 case 26: /* Interface MTU */ 908 memcpy(&mtu, ext+1, sizeof(mtu)); 909 ic_dev_mtu = ntohs(mtu); 910 break; 911 case 40: /* NIS Domain name (_not_ DNS) */ 912 ic_bootp_string(utsname()->domainname, ext+1, *ext, 913 __NEW_UTS_LEN); 914 break; 915 } 916 } 917 918 919 /* 920 * Receive BOOTP reply. 921 */ 922 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 923 { 924 struct bootp_pkt *b; 925 struct iphdr *h; 926 struct ic_device *d; 927 int len, ext_len; 928 929 if (!net_eq(dev_net(dev), &init_net)) 930 goto drop; 931 932 /* Perform verifications before taking the lock. */ 933 if (skb->pkt_type == PACKET_OTHERHOST) 934 goto drop; 935 936 skb = skb_share_check(skb, GFP_ATOMIC); 937 if (!skb) 938 return NET_RX_DROP; 939 940 if (!pskb_may_pull(skb, 941 sizeof(struct iphdr) + 942 sizeof(struct udphdr))) 943 goto drop; 944 945 b = (struct bootp_pkt *)skb_network_header(skb); 946 h = &b->iph; 947 948 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 949 goto drop; 950 951 /* Fragments are not supported */ 952 if (ip_is_fragment(h)) { 953 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); 954 goto drop; 955 } 956 957 if (skb->len < ntohs(h->tot_len)) 958 goto drop; 959 960 if (ip_fast_csum((char *) h, h->ihl)) 961 goto drop; 962 963 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 964 goto drop; 965 966 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 967 goto drop; 968 969 len = ntohs(b->udph.len) - sizeof(struct udphdr); 970 ext_len = len - (sizeof(*b) - 971 sizeof(struct iphdr) - 972 sizeof(struct udphdr) - 973 sizeof(b->exten)); 974 if (ext_len < 0) 975 goto drop; 976 977 /* Ok the front looks good, make sure we can get at the rest. */ 978 if (!pskb_may_pull(skb, skb->len)) 979 goto drop; 980 981 b = (struct bootp_pkt *)skb_network_header(skb); 982 h = &b->iph; 983 984 /* One reply at a time, please. */ 985 spin_lock(&ic_recv_lock); 986 987 /* If we already have a reply, just drop the packet */ 988 if (ic_got_reply) 989 goto drop_unlock; 990 991 /* Find the ic_device that the packet arrived on */ 992 d = ic_first_dev; 993 while (d && d->dev != dev) 994 d = d->next; 995 if (!d) 996 goto drop_unlock; /* should never happen */ 997 998 /* Is it a reply to our BOOTP request? */ 999 if (b->op != BOOTP_REPLY || 1000 b->xid != d->xid) { 1001 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n", 1002 d->dev->name, b->op, b->xid); 1003 goto drop_unlock; 1004 } 1005 1006 /* Parse extensions */ 1007 if (ext_len >= 4 && 1008 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1009 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1010 u8 *ext; 1011 1012 #ifdef IPCONFIG_DHCP 1013 if (ic_proto_enabled & IC_USE_DHCP) { 1014 __be32 server_id = NONE; 1015 int mt = 0; 1016 1017 ext = &b->exten[4]; 1018 while (ext < end && *ext != 0xff) { 1019 u8 *opt = ext++; 1020 if (*opt == 0) /* Padding */ 1021 continue; 1022 ext += *ext + 1; 1023 if (ext >= end) 1024 break; 1025 switch (*opt) { 1026 case 53: /* Message type */ 1027 if (opt[1]) 1028 mt = opt[2]; 1029 break; 1030 case 54: /* Server ID (IP address) */ 1031 if (opt[1] >= 4) 1032 memcpy(&server_id, opt + 2, 4); 1033 break; 1034 } 1035 } 1036 1037 pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name); 1038 1039 switch (mt) { 1040 case DHCPOFFER: 1041 /* While in the process of accepting one offer, 1042 * ignore all others. 1043 */ 1044 if (ic_myaddr != NONE) 1045 goto drop_unlock; 1046 1047 /* Let's accept that offer. */ 1048 ic_myaddr = b->your_ip; 1049 ic_servaddr = server_id; 1050 pr_debug("DHCP: Offered address %pI4 by server %pI4\n", 1051 &ic_myaddr, &b->iph.saddr); 1052 /* The DHCP indicated server address takes 1053 * precedence over the bootp header one if 1054 * they are different. 1055 */ 1056 if ((server_id != NONE) && 1057 (b->server_ip != server_id)) 1058 b->server_ip = ic_servaddr; 1059 break; 1060 1061 case DHCPACK: 1062 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1063 goto drop_unlock; 1064 1065 /* Yeah! */ 1066 break; 1067 1068 default: 1069 /* Urque. Forget it*/ 1070 ic_myaddr = NONE; 1071 ic_servaddr = NONE; 1072 goto drop_unlock; 1073 } 1074 1075 ic_dhcp_msgtype = mt; 1076 1077 } 1078 #endif /* IPCONFIG_DHCP */ 1079 1080 ext = &b->exten[4]; 1081 while (ext < end && *ext != 0xff) { 1082 u8 *opt = ext++; 1083 if (*opt == 0) /* Padding */ 1084 continue; 1085 ext += *ext + 1; 1086 if (ext < end) 1087 ic_do_bootp_ext(opt); 1088 } 1089 } 1090 1091 /* We have a winner! */ 1092 ic_dev = d; 1093 ic_myaddr = b->your_ip; 1094 ic_servaddr = b->server_ip; 1095 ic_addrservaddr = b->iph.saddr; 1096 if (ic_gateway == NONE && b->relay_ip) 1097 ic_gateway = b->relay_ip; 1098 if (ic_nameservers[0] == NONE) 1099 ic_nameservers[0] = ic_servaddr; 1100 ic_got_reply = IC_BOOTP; 1101 1102 drop_unlock: 1103 /* Show's over. Nothing to see here. */ 1104 spin_unlock(&ic_recv_lock); 1105 1106 drop: 1107 /* Throw the packet out. */ 1108 kfree_skb(skb); 1109 1110 return 0; 1111 } 1112 1113 1114 #endif 1115 1116 1117 /* 1118 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1119 */ 1120 1121 #ifdef IPCONFIG_DYNAMIC 1122 1123 static int __init ic_dynamic(void) 1124 { 1125 int retries; 1126 struct ic_device *d; 1127 unsigned long start_jiffies, timeout, jiff; 1128 int do_bootp = ic_proto_have_if & IC_BOOTP; 1129 int do_rarp = ic_proto_have_if & IC_RARP; 1130 1131 /* 1132 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1133 * This routine gets only called when some pieces of information 1134 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1135 */ 1136 if (!ic_proto_enabled) { 1137 pr_err("IP-Config: Incomplete network configuration information\n"); 1138 return -1; 1139 } 1140 1141 #ifdef IPCONFIG_BOOTP 1142 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1143 pr_err("DHCP/BOOTP: No suitable device found\n"); 1144 #endif 1145 #ifdef IPCONFIG_RARP 1146 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1147 pr_err("RARP: No suitable device found\n"); 1148 #endif 1149 1150 if (!ic_proto_have_if) 1151 /* Error message already printed */ 1152 return -1; 1153 1154 /* 1155 * Setup protocols 1156 */ 1157 #ifdef IPCONFIG_BOOTP 1158 if (do_bootp) 1159 ic_bootp_init(); 1160 #endif 1161 #ifdef IPCONFIG_RARP 1162 if (do_rarp) 1163 ic_rarp_init(); 1164 #endif 1165 1166 /* 1167 * Send requests and wait, until we get an answer. This loop 1168 * seems to be a terrible waste of CPU time, but actually there is 1169 * only one process running at all, so we don't need to use any 1170 * scheduler functions. 1171 * [Actually we could now, but the nothing else running note still 1172 * applies.. - AC] 1173 */ 1174 pr_notice("Sending %s%s%s requests .", 1175 do_bootp 1176 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1177 (do_bootp && do_rarp) ? " and " : "", 1178 do_rarp ? "RARP" : ""); 1179 1180 start_jiffies = jiffies; 1181 d = ic_first_dev; 1182 retries = CONF_SEND_RETRIES; 1183 get_random_bytes(&timeout, sizeof(timeout)); 1184 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); 1185 for (;;) { 1186 #ifdef IPCONFIG_BOOTP 1187 if (do_bootp && (d->able & IC_BOOTP)) 1188 ic_bootp_send_if(d, jiffies - start_jiffies); 1189 #endif 1190 #ifdef IPCONFIG_RARP 1191 if (do_rarp && (d->able & IC_RARP)) 1192 ic_rarp_send_if(d); 1193 #endif 1194 1195 if (!d->next) { 1196 jiff = jiffies + timeout; 1197 while (time_before(jiffies, jiff) && !ic_got_reply) 1198 schedule_timeout_uninterruptible(1); 1199 } 1200 #ifdef IPCONFIG_DHCP 1201 /* DHCP isn't done until we get a DHCPACK. */ 1202 if ((ic_got_reply & IC_BOOTP) && 1203 (ic_proto_enabled & IC_USE_DHCP) && 1204 ic_dhcp_msgtype != DHCPACK) { 1205 ic_got_reply = 0; 1206 /* continue on device that got the reply */ 1207 d = ic_dev; 1208 pr_cont(","); 1209 continue; 1210 } 1211 #endif /* IPCONFIG_DHCP */ 1212 1213 if (ic_got_reply) { 1214 pr_cont(" OK\n"); 1215 break; 1216 } 1217 1218 if ((d = d->next)) 1219 continue; 1220 1221 if (! --retries) { 1222 pr_cont(" timed out!\n"); 1223 break; 1224 } 1225 1226 d = ic_first_dev; 1227 1228 timeout = timeout CONF_TIMEOUT_MULT; 1229 if (timeout > CONF_TIMEOUT_MAX) 1230 timeout = CONF_TIMEOUT_MAX; 1231 1232 pr_cont("."); 1233 } 1234 1235 #ifdef IPCONFIG_BOOTP 1236 if (do_bootp) 1237 ic_bootp_cleanup(); 1238 #endif 1239 #ifdef IPCONFIG_RARP 1240 if (do_rarp) 1241 ic_rarp_cleanup(); 1242 #endif 1243 1244 if (!ic_got_reply) { 1245 ic_myaddr = NONE; 1246 return -1; 1247 } 1248 1249 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n", 1250 ((ic_got_reply & IC_RARP) ? "RARP" 1251 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1252 &ic_addrservaddr, &ic_myaddr); 1253 1254 return 0; 1255 } 1256 1257 #endif /* IPCONFIG_DYNAMIC */ 1258 1259 #ifdef CONFIG_PROC_FS 1260 1261 static int pnp_seq_show(struct seq_file *seq, void *v) 1262 { 1263 int i; 1264 1265 if (ic_proto_used & IC_PROTO) 1266 seq_printf(seq, "#PROTO: %s\n", 1267 (ic_proto_used & IC_RARP) ? "RARP" 1268 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1269 else 1270 seq_puts(seq, "#MANUAL\n"); 1271 1272 if (ic_domain[0]) 1273 seq_printf(seq, 1274 "domain %s\n", ic_domain); 1275 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1276 if (ic_nameservers[i] != NONE) 1277 seq_printf(seq, "nameserver %pI4\n", 1278 &ic_nameservers[i]); 1279 } 1280 if (ic_servaddr != NONE) 1281 seq_printf(seq, "bootserver %pI4\n", 1282 &ic_servaddr); 1283 return 0; 1284 } 1285 1286 static int pnp_seq_open(struct inode *indoe, struct file *file) 1287 { 1288 return single_open(file, pnp_seq_show, NULL); 1289 } 1290 1291 static const struct file_operations pnp_seq_fops = { 1292 .open = pnp_seq_open, 1293 .read = seq_read, 1294 .llseek = seq_lseek, 1295 .release = single_release, 1296 }; 1297 #endif /* CONFIG_PROC_FS */ 1298 1299 /* 1300 * Extract IP address from the parameter string if needed. Note that we 1301 * need to have root_server_addr set _before_ IPConfig gets called as it 1302 * can override it. 1303 */ 1304 __be32 __init root_nfs_parse_addr(char *name) 1305 { 1306 __be32 addr; 1307 int octets = 0; 1308 char *cp, *cq; 1309 1310 cp = cq = name; 1311 while (octets < 4) { 1312 while (*cp >= '0' && *cp <= '9') 1313 cp++; 1314 if (cp == cq || cp - cq > 3) 1315 break; 1316 if (*cp == '.' || octets == 3) 1317 octets++; 1318 if (octets < 4) 1319 cp++; 1320 cq = cp; 1321 } 1322 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1323 if (*cp == ':') 1324 *cp++ = '\0'; 1325 addr = in_aton(name); 1326 memmove(name, cp, strlen(cp) + 1); 1327 } else 1328 addr = NONE; 1329 1330 return addr; 1331 } 1332 1333 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1334 1335 static int __init wait_for_devices(void) 1336 { 1337 int i; 1338 1339 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1340 struct net_device *dev; 1341 int found = 0; 1342 1343 rtnl_lock(); 1344 for_each_netdev(&init_net, dev) { 1345 if (ic_is_init_dev(dev)) { 1346 found = 1; 1347 break; 1348 } 1349 } 1350 rtnl_unlock(); 1351 if (found) 1352 return 0; 1353 ssleep(1); 1354 } 1355 return -ENODEV; 1356 } 1357 1358 /* 1359 * IP Autoconfig dispatcher. 1360 */ 1361 1362 static int __init ip_auto_config(void) 1363 { 1364 __be32 addr; 1365 #ifdef IPCONFIG_DYNAMIC 1366 int retries = CONF_OPEN_RETRIES; 1367 #endif 1368 int err; 1369 unsigned int i; 1370 1371 #ifdef CONFIG_PROC_FS 1372 proc_create("pnp", 0444, init_net.proc_net, &pnp_seq_fops); 1373 #endif /* CONFIG_PROC_FS */ 1374 1375 if (!ic_enable) 1376 return 0; 1377 1378 pr_debug("IP-Config: Entered.\n"); 1379 #ifdef IPCONFIG_DYNAMIC 1380 try_try_again: 1381 #endif 1382 /* Wait for devices to appear */ 1383 err = wait_for_devices(); 1384 if (err) 1385 return err; 1386 1387 /* Setup all network devices */ 1388 err = ic_open_devs(); 1389 if (err) 1390 return err; 1391 1392 /* Give drivers a chance to settle */ 1393 msleep(CONF_POST_OPEN); 1394 1395 /* 1396 * If the config information is insufficient (e.g., our IP address or 1397 * IP address of the boot server is missing or we have multiple network 1398 * interfaces and no default was set), use BOOTP or RARP to get the 1399 * missing values. 1400 */ 1401 if (ic_myaddr == NONE || 1402 #ifdef CONFIG_ROOT_NFS 1403 (root_server_addr == NONE && 1404 ic_servaddr == NONE && 1405 ROOT_DEV == Root_NFS) || 1406 #endif 1407 ic_first_dev->next) { 1408 #ifdef IPCONFIG_DYNAMIC 1409 if (ic_dynamic() < 0) { 1410 ic_close_devs(); 1411 1412 /* 1413 * I don't know why, but sometimes the 1414 * eepro100 driver (at least) gets upset and 1415 * doesn't work the first time it's opened. 1416 * But then if you close it and reopen it, it 1417 * works just fine. So we need to try that at 1418 * least once before giving up. 1419 * 1420 * Also, if the root will be NFS-mounted, we 1421 * have nowhere to go if DHCP fails. So we 1422 * just have to keep trying forever. 1423 * 1424 * -- Chip 1425 */ 1426 #ifdef CONFIG_ROOT_NFS 1427 if (ROOT_DEV == Root_NFS) { 1428 pr_err("IP-Config: Retrying forever (NFS root)...\n"); 1429 goto try_try_again; 1430 } 1431 #endif 1432 1433 if (--retries) { 1434 pr_err("IP-Config: Reopening network devices...\n"); 1435 goto try_try_again; 1436 } 1437 1438 /* Oh, well. At least we tried. */ 1439 pr_err("IP-Config: Auto-configuration of network failed\n"); 1440 return -1; 1441 } 1442 #else /* !DYNAMIC */ 1443 pr_err("IP-Config: Incomplete network configuration information\n"); 1444 ic_close_devs(); 1445 return -1; 1446 #endif /* IPCONFIG_DYNAMIC */ 1447 } else { 1448 /* Device selected manually or only one device -> use it */ 1449 ic_dev = ic_first_dev; 1450 } 1451 1452 addr = root_nfs_parse_addr(root_server_path); 1453 if (root_server_addr == NONE) 1454 root_server_addr = addr; 1455 1456 /* 1457 * Use defaults wherever applicable. 1458 */ 1459 if (ic_defaults() < 0) 1460 return -1; 1461 1462 /* 1463 * Record which protocol was actually used. 1464 */ 1465 #ifdef IPCONFIG_DYNAMIC 1466 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1467 #endif 1468 1469 #ifndef IPCONFIG_SILENT 1470 /* 1471 * Clue in the operator. 1472 */ 1473 pr_info("IP-Config: Complete:\n"); 1474 1475 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", 1476 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr, 1477 &ic_myaddr, &ic_netmask, &ic_gateway); 1478 pr_info(" host=%s, domain=%s, nis-domain=%s\n", 1479 utsname()->nodename, ic_domain, utsname()->domainname); 1480 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", 1481 &ic_servaddr, &root_server_addr, root_server_path); 1482 if (ic_dev_mtu) 1483 pr_cont(", mtu=%d", ic_dev_mtu); 1484 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 1485 if (ic_nameservers[i] != NONE) { 1486 pr_cont(" nameserver%u=%pI4", 1487 i, &ic_nameservers[i]); 1488 break; 1489 } 1490 for (i++; i < CONF_NAMESERVERS_MAX; i++) 1491 if (ic_nameservers[i] != NONE) 1492 pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]); 1493 pr_cont("\n"); 1494 #endif /* !SILENT */ 1495 1496 /* 1497 * Close all network devices except the device we've 1498 * autoconfigured and set up routes. 1499 */ 1500 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1501 err = -1; 1502 else 1503 err = 0; 1504 1505 ic_close_devs(); 1506 1507 return err; 1508 } 1509 1510 late_initcall(ip_auto_config); 1511 1512 1513 /* 1514 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1515 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. 1516 */ 1517 static int __init ic_proto_name(char *name) 1518 { 1519 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1520 return 1; 1521 } 1522 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1523 return 0; 1524 } 1525 #ifdef CONFIG_IP_PNP_DHCP 1526 else if (!strncmp(name, "dhcp", 4)) { 1527 char *client_id; 1528 1529 ic_proto_enabled &= ~IC_RARP; 1530 client_id = strstr(name, "dhcp,"); 1531 if (client_id) { 1532 char *v; 1533 1534 client_id = client_id + 5; 1535 v = strchr(client_id, ','); 1536 if (!v) 1537 return 1; 1538 *v = 0; 1539 if (kstrtou8(client_id, 0, dhcp_client_identifier)) 1540 pr_debug("DHCP: Invalid client identifier type\n"); 1541 strncpy(dhcp_client_identifier + 1, v + 1, 251); 1542 *v = ','; 1543 } 1544 return 1; 1545 } 1546 #endif 1547 #ifdef CONFIG_IP_PNP_BOOTP 1548 else if (!strcmp(name, "bootp")) { 1549 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1550 return 1; 1551 } 1552 #endif 1553 #ifdef CONFIG_IP_PNP_RARP 1554 else if (!strcmp(name, "rarp")) { 1555 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1556 return 1; 1557 } 1558 #endif 1559 #ifdef IPCONFIG_DYNAMIC 1560 else if (!strcmp(name, "both")) { 1561 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1562 return 1; 1563 } 1564 #endif 1565 return 0; 1566 } 1567 1568 static int __init ip_auto_config_setup(char *addrs) 1569 { 1570 char *cp, *ip, *dp; 1571 int num = 0; 1572 1573 ic_set_manually = 1; 1574 ic_enable = 1; 1575 1576 /* 1577 * If any dhcp, bootp etc options are set, leave autoconfig on 1578 * and skip the below static IP processing. 1579 */ 1580 if (ic_proto_name(addrs)) 1581 return 1; 1582 1583 /* If no static IP is given, turn off autoconfig and bail. */ 1584 if (*addrs == 0 || 1585 strcmp(addrs, "off") == 0 || 1586 strcmp(addrs, "none") == 0) { 1587 ic_enable = 0; 1588 return 1; 1589 } 1590 1591 ic_nameservers_predef(); 1592 1593 /* Parse string for static IP assignment. */ 1594 ip = addrs; 1595 while (ip && *ip) { 1596 if ((cp = strchr(ip, ':'))) 1597 *cp++ = '\0'; 1598 if (strlen(ip) > 0) { 1599 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip); 1600 switch (num) { 1601 case 0: 1602 if ((ic_myaddr = in_aton(ip)) == ANY) 1603 ic_myaddr = NONE; 1604 break; 1605 case 1: 1606 if ((ic_servaddr = in_aton(ip)) == ANY) 1607 ic_servaddr = NONE; 1608 break; 1609 case 2: 1610 if ((ic_gateway = in_aton(ip)) == ANY) 1611 ic_gateway = NONE; 1612 break; 1613 case 3: 1614 if ((ic_netmask = in_aton(ip)) == ANY) 1615 ic_netmask = NONE; 1616 break; 1617 case 4: 1618 if ((dp = strchr(ip, '.'))) { 1619 *dp++ = '\0'; 1620 strlcpy(utsname()->domainname, dp, 1621 sizeof(utsname()->domainname)); 1622 } 1623 strlcpy(utsname()->nodename, ip, 1624 sizeof(utsname()->nodename)); 1625 ic_host_name_set = 1; 1626 break; 1627 case 5: 1628 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1629 break; 1630 case 6: 1631 if (ic_proto_name(ip) == 0 && 1632 ic_myaddr == NONE) { 1633 ic_enable = 0; 1634 } 1635 break; 1636 case 7: 1637 if (CONF_NAMESERVERS_MAX >= 1) { 1638 ic_nameservers[0] = in_aton(ip); 1639 if (ic_nameservers[0] == ANY) 1640 ic_nameservers[0] = NONE; 1641 } 1642 break; 1643 case 8: 1644 if (CONF_NAMESERVERS_MAX >= 2) { 1645 ic_nameservers[1] = in_aton(ip); 1646 if (ic_nameservers[1] == ANY) 1647 ic_nameservers[1] = NONE; 1648 } 1649 break; 1650 } 1651 } 1652 ip = cp; 1653 num++; 1654 } 1655 1656 return 1; 1657 } 1658 __setup("ip=", ip_auto_config_setup); 1659 1660 static int __init nfsaddrs_config_setup(char *addrs) 1661 { 1662 return ip_auto_config_setup(addrs); 1663 } 1664 __setup("nfsaddrs=", nfsaddrs_config_setup); 1665 1666 static int __init vendor_class_identifier_setup(char *addrs) 1667 { 1668 if (strlcpy(vendor_class_identifier, addrs, 1669 sizeof(vendor_class_identifier)) 1670 >= sizeof(vendor_class_identifier)) 1671 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n", 1672 vendor_class_identifier); 1673 return 1; 1674 } 1675 __setup("dhcpclass=", vendor_class_identifier_setup); 1676