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 * NTP servers in /proc/net/ipconfig/ntp_servers 33 * -- Chris Novakovic <chris@chrisn.me.uk>, April 2018 34 */ 35 36#include <linux/types.h> 37#include <linux/string.h> 38#include <linux/kernel.h> 39#include <linux/jiffies.h> 40#include <linux/random.h> 41#include <linux/init.h> 42#include <linux/utsname.h> 43#include <linux/in.h> 44#include <linux/if.h> 45#include <linux/inet.h> 46#include <linux/inetdevice.h> 47#include <linux/netdevice.h> 48#include <linux/if_arp.h> 49#include <linux/skbuff.h> 50#include <linux/ip.h> 51#include <linux/socket.h> 52#include <linux/route.h> 53#include <linux/udp.h> 54#include <linux/proc_fs.h> 55#include <linux/seq_file.h> 56#include <linux/major.h> 57#include <linux/root_dev.h> 58#include <linux/delay.h> 59#include <linux/nfs_fs.h> 60#include <linux/slab.h> 61#include <linux/export.h> 62#include <net/net_namespace.h> 63#include <net/arp.h> 64#include <net/ip.h> 65#include <net/ipconfig.h> 66#include <net/route.h> 67 68#include <linux/uaccess.h> 69#include <net/checksum.h> 70#include <asm/processor.h> 71 72#if defined(CONFIG_IP_PNP_DHCP) 73#define IPCONFIG_DHCP 74#endif 75#if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) 76#define IPCONFIG_BOOTP 77#endif 78#if defined(CONFIG_IP_PNP_RARP) 79#define IPCONFIG_RARP 80#endif 81#if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) 82#define IPCONFIG_DYNAMIC 83#endif 84 85/* Define the friendly delay before and after opening net devices */ 86#define CONF_POST_OPEN 10 /* After opening: 10 msecs */ 87 88/* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ 89#define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ 90#define CONF_SEND_RETRIES 6 /* Send six requests per open */ 91#define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ 92#define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ 93#define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ 94#define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ 95#define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers 96 - '3' from resolv.h */ 97#define CONF_NTP_SERVERS_MAX 3 /* Maximum number of NTP servers */ 98 99#define NONE cpu_to_be32(INADDR_NONE) 100#define ANY cpu_to_be32(INADDR_ANY) 101 102/* Wait for carrier timeout default in seconds */ 103static unsigned int carrier_timeout = 120; 104 105/* 106 * Public IP configuration 107 */ 108 109/* This is used by platforms which might be able to set the ipconfig 110 * variables using firmware environment vars. If this is set, it will 111 * ignore such firmware variables. 112 */ 113int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ 114 115static int ic_enable __initdata; /* IP config enabled? */ 116 117/* Protocol choice */ 118int ic_proto_enabled __initdata = 0 119#ifdef IPCONFIG_BOOTP 120 | IC_BOOTP 121#endif 122#ifdef CONFIG_IP_PNP_DHCP 123 | IC_USE_DHCP 124#endif 125#ifdef IPCONFIG_RARP 126 | IC_RARP 127#endif 128 ; 129 130static int ic_host_name_set __initdata; /* Host name set by us? */ 131 132__be32 ic_myaddr = NONE; /* My IP address */ 133static __be32 ic_netmask = NONE; /* Netmask for local subnet */ 134__be32 ic_gateway = NONE; /* Gateway IP address */ 135 136#ifdef IPCONFIG_DYNAMIC 137static __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */ 138#endif 139 140__be32 ic_servaddr = NONE; /* Boot server IP address */ 141 142__be32 root_server_addr = NONE; /* Address of NFS server */ 143u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 144 145/* vendor class identifier */ 146static char vendor_class_identifier[253] __initdata; 147 148#if defined(CONFIG_IP_PNP_DHCP) 149static char dhcp_client_identifier[253] __initdata; 150#endif 151 152/* Persistent data: */ 153 154#ifdef IPCONFIG_DYNAMIC 155static int ic_proto_used; /* Protocol used, if any */ 156#else 157#define ic_proto_used 0 158#endif 159static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 160static __be32 ic_ntp_servers[CONF_NTP_SERVERS_MAX]; /* NTP server IP addresses */ 161static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 162 163/* 164 * Private state. 165 */ 166 167/* Name of user-selected boot device */ 168static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 169 170/* Protocols supported by available interfaces */ 171static int ic_proto_have_if __initdata; 172 173/* MTU for boot device */ 174static int ic_dev_mtu __initdata; 175 176#ifdef IPCONFIG_DYNAMIC 177static DEFINE_SPINLOCK(ic_recv_lock); 178static volatile int ic_got_reply __initdata; /* Proto(s) that replied */ 179#endif 180#ifdef IPCONFIG_DHCP 181static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */ 182#endif 183 184 185/* 186 * Network devices 187 */ 188 189struct ic_device { 190 struct ic_device *next; 191 struct net_device *dev; 192 unsigned short flags; 193 short able; 194 __be32 xid; 195}; 196 197static struct ic_device *ic_first_dev __initdata; /* List of open device */ 198static struct ic_device *ic_dev __initdata; /* Selected device */ 199 200static bool __init ic_is_init_dev(struct net_device *dev) 201{ 202 if (dev->flags & IFF_LOOPBACK) 203 return false; 204 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 205 (!(dev->flags & IFF_LOOPBACK) && 206 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 207 strncmp(dev->name, "dummy", 5)); 208} 209 210static int __init ic_open_devs(void) 211{ 212 struct ic_device *d, **last; 213 struct net_device *dev; 214 unsigned short oflags; 215 unsigned long start, next_msg; 216 217 last = &ic_first_dev; 218 rtnl_lock(); 219 220 /* bring loopback device up first */ 221 for_each_netdev(&init_net, dev) { 222 if (!(dev->flags & IFF_LOOPBACK)) 223 continue; 224 if (dev_change_flags(dev, dev->flags | IFF_UP, NULL) < 0) 225 pr_err("IP-Config: Failed to open %s\n", dev->name); 226 } 227 228 for_each_netdev(&init_net, dev) { 229 if (ic_is_init_dev(dev)) { 230 int able = 0; 231 if (dev->mtu >= 364) 232 able |= IC_BOOTP; 233 else 234 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n", 235 dev->name, dev->mtu); 236 if (!(dev->flags & IFF_NOARP)) 237 able |= IC_RARP; 238 able &= ic_proto_enabled; 239 if (ic_proto_enabled && !able) 240 continue; 241 oflags = dev->flags; 242 if (dev_change_flags(dev, oflags | IFF_UP, NULL) < 0) { 243 pr_err("IP-Config: Failed to open %s\n", 244 dev->name); 245 continue; 246 } 247 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 248 rtnl_unlock(); 249 return -ENOMEM; 250 } 251 d->dev = dev; 252 *last = d; 253 last = &d->next; 254 d->flags = oflags; 255 d->able = able; 256 if (able & IC_BOOTP) 257 get_random_bytes(&d->xid, sizeof(__be32)); 258 else 259 d->xid = 0; 260 ic_proto_have_if |= able; 261 pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n", 262 dev->name, able, d->xid); 263 } 264 } 265 /* Devices with a complex topology like SFP ethernet interfaces needs 266 * the rtnl_lock at init. The carrier wait-loop must therefore run 267 * without holding it. 268 */ 269 rtnl_unlock(); 270 271 /* no point in waiting if we could not bring up at least one device */ 272 if (!ic_first_dev) 273 goto have_carrier; 274 275 /* wait for a carrier on at least one device */ 276 start = jiffies; 277 next_msg = start + msecs_to_jiffies(20000); 278 while (time_before(jiffies, start + 279 msecs_to_jiffies(carrier_timeout * 1000))) { 280 int wait, elapsed; 281 282 rtnl_lock(); 283 for_each_netdev(&init_net, dev) 284 if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) { 285 rtnl_unlock(); 286 goto have_carrier; 287 } 288 rtnl_unlock(); 289 290 msleep(1); 291 292 if (time_before(jiffies, next_msg)) 293 continue; 294 295 elapsed = jiffies_to_msecs(jiffies - start); 296 wait = (carrier_timeout * 1000 - elapsed + 500) / 1000; 297 pr_info("Waiting up to %d more seconds for network.\n", wait); 298 next_msg = jiffies + msecs_to_jiffies(20000); 299 } 300have_carrier: 301 302 *last = NULL; 303 304 if (!ic_first_dev) { 305 if (user_dev_name[0]) 306 pr_err("IP-Config: Device `%s' not found\n", 307 user_dev_name); 308 else 309 pr_err("IP-Config: No network devices available\n"); 310 return -ENODEV; 311 } 312 return 0; 313} 314 315/* Close all network interfaces except the one we've autoconfigured, and its 316 * lowers, in case it's a stacked virtual interface. 317 */ 318static void __init ic_close_devs(void) 319{ 320 struct net_device *selected_dev = ic_dev ? ic_dev->dev : NULL; 321 struct ic_device *d, *next; 322 struct net_device *dev; 323 324 rtnl_lock(); 325 next = ic_first_dev; 326 while ((d = next)) { 327 bool bring_down = (d != ic_dev); 328 struct net_device *lower; 329 struct list_head *iter; 330 331 next = d->next; 332 dev = d->dev; 333 334 if (selected_dev) { 335 netdev_for_each_lower_dev(selected_dev, lower, iter) { 336 if (dev == lower) { 337 bring_down = false; 338 break; 339 } 340 } 341 } 342 if (bring_down) { 343 pr_debug("IP-Config: Downing %s\n", dev->name); 344 dev_change_flags(dev, d->flags, NULL); 345 } 346 kfree(d); 347 } 348 rtnl_unlock(); 349} 350 351/* 352 * Interface to various network functions. 353 */ 354 355static inline void 356set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 357{ 358 sin->sin_family = AF_INET; 359 sin->sin_addr.s_addr = addr; 360 sin->sin_port = port; 361} 362 363/* 364 * Set up interface addresses and routes. 365 */ 366 367static int __init ic_setup_if(void) 368{ 369 struct ifreq ir; 370 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 371 int err; 372 373 memset(&ir, 0, sizeof(ir)); 374 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name); 375 set_sockaddr(sin, ic_myaddr, 0); 376 if ((err = devinet_ioctl(&init_net, SIOCSIFADDR, &ir)) < 0) { 377 pr_err("IP-Config: Unable to set interface address (%d)\n", 378 err); 379 return -1; 380 } 381 set_sockaddr(sin, ic_netmask, 0); 382 if ((err = devinet_ioctl(&init_net, SIOCSIFNETMASK, &ir)) < 0) { 383 pr_err("IP-Config: Unable to set interface netmask (%d)\n", 384 err); 385 return -1; 386 } 387 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 388 if ((err = devinet_ioctl(&init_net, SIOCSIFBRDADDR, &ir)) < 0) { 389 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n", 390 err); 391 return -1; 392 } 393 /* Handle the case where we need non-standard MTU on the boot link (a network 394 * using jumbo frames, for instance). If we can't set the mtu, don't error 395 * out, we'll try to muddle along. 396 */ 397 if (ic_dev_mtu != 0) { 398 rtnl_lock(); 399 if ((err = dev_set_mtu(ic_dev->dev, ic_dev_mtu)) < 0) 400 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", 401 ic_dev_mtu, err); 402 rtnl_unlock(); 403 } 404 return 0; 405} 406 407static int __init ic_setup_routes(void) 408{ 409 /* No need to setup device routes, only the default route... */ 410 411 if (ic_gateway != NONE) { 412 struct rtentry rm; 413 int err; 414 415 memset(&rm, 0, sizeof(rm)); 416 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 417 pr_err("IP-Config: Gateway not on directly connected network\n"); 418 return -1; 419 } 420 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 421 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 422 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 423 rm.rt_flags = RTF_UP | RTF_GATEWAY; 424 if ((err = ip_rt_ioctl(&init_net, SIOCADDRT, &rm)) < 0) { 425 pr_err("IP-Config: Cannot add default route (%d)\n", 426 err); 427 return -1; 428 } 429 } 430 431 return 0; 432} 433 434/* 435 * Fill in default values for all missing parameters. 436 */ 437 438static int __init ic_defaults(void) 439{ 440 /* 441 * At this point we have no userspace running so need not 442 * claim locks on system_utsname 443 */ 444 445 if (!ic_host_name_set) 446 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 447 448 if (root_server_addr == NONE) 449 root_server_addr = ic_servaddr; 450 451 if (ic_netmask == NONE) { 452 if (IN_CLASSA(ntohl(ic_myaddr))) 453 ic_netmask = htonl(IN_CLASSA_NET); 454 else if (IN_CLASSB(ntohl(ic_myaddr))) 455 ic_netmask = htonl(IN_CLASSB_NET); 456 else if (IN_CLASSC(ntohl(ic_myaddr))) 457 ic_netmask = htonl(IN_CLASSC_NET); 458 else if (IN_CLASSE(ntohl(ic_myaddr))) 459 ic_netmask = htonl(IN_CLASSE_NET); 460 else { 461 pr_err("IP-Config: Unable to guess netmask for address %pI4\n", 462 &ic_myaddr); 463 return -1; 464 } 465 pr_notice("IP-Config: Guessing netmask %pI4\n", 466 &ic_netmask); 467 } 468 469 return 0; 470} 471 472/* 473 * RARP support. 474 */ 475 476#ifdef IPCONFIG_RARP 477 478static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 479 480static struct packet_type rarp_packet_type __initdata = { 481 .type = cpu_to_be16(ETH_P_RARP), 482 .func = ic_rarp_recv, 483}; 484 485static inline void __init ic_rarp_init(void) 486{ 487 dev_add_pack(&rarp_packet_type); 488} 489 490static inline void __init ic_rarp_cleanup(void) 491{ 492 dev_remove_pack(&rarp_packet_type); 493} 494 495/* 496 * Process received RARP packet. 497 */ 498static int __init 499ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 500{ 501 struct arphdr *rarp; 502 unsigned char *rarp_ptr; 503 __be32 sip, tip; 504 unsigned char *tha; /* t for "target" */ 505 struct ic_device *d; 506 507 if (!net_eq(dev_net(dev), &init_net)) 508 goto drop; 509 510 skb = skb_share_check(skb, GFP_ATOMIC); 511 if (!skb) 512 return NET_RX_DROP; 513 514 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 515 goto drop; 516 517 /* Basic sanity checks can be done without the lock. */ 518 rarp = (struct arphdr *)skb_transport_header(skb); 519 520 /* If this test doesn't pass, it's not IP, or we should 521 * ignore it anyway. 522 */ 523 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 524 goto drop; 525 526 /* If it's not a RARP reply, delete it. */ 527 if (rarp->ar_op != htons(ARPOP_RREPLY)) 528 goto drop; 529 530 /* If it's not Ethernet, delete it. */ 531 if (rarp->ar_pro != htons(ETH_P_IP)) 532 goto drop; 533 534 if (!pskb_may_pull(skb, arp_hdr_len(dev))) 535 goto drop; 536 537 /* OK, it is all there and looks valid, process... */ 538 rarp = (struct arphdr *)skb_transport_header(skb); 539 rarp_ptr = (unsigned char *) (rarp + 1); 540 541 /* One reply at a time, please. */ 542 spin_lock(&ic_recv_lock); 543 544 /* If we already have a reply, just drop the packet */ 545 if (ic_got_reply) 546 goto drop_unlock; 547 548 /* Find the ic_device that the packet arrived on */ 549 d = ic_first_dev; 550 while (d && d->dev != dev) 551 d = d->next; 552 if (!d) 553 goto drop_unlock; /* should never happen */ 554 555 /* Extract variable-width fields */ 556 rarp_ptr += dev->addr_len; 557 memcpy(&sip, rarp_ptr, 4); 558 rarp_ptr += 4; 559 tha = rarp_ptr; 560 rarp_ptr += dev->addr_len; 561 memcpy(&tip, rarp_ptr, 4); 562 563 /* Discard packets which are not meant for us. */ 564 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 565 goto drop_unlock; 566 567 /* Discard packets which are not from specified server. */ 568 if (ic_servaddr != NONE && ic_servaddr != sip) 569 goto drop_unlock; 570 571 /* We have a winner! */ 572 ic_dev = d; 573 if (ic_myaddr == NONE) 574 ic_myaddr = tip; 575 ic_servaddr = sip; 576 ic_addrservaddr = sip; 577 ic_got_reply = IC_RARP; 578 579drop_unlock: 580 /* Show's over. Nothing to see here. */ 581 spin_unlock(&ic_recv_lock); 582 583drop: 584 /* Throw the packet out. */ 585 kfree_skb(skb); 586 return 0; 587} 588 589 590/* 591 * Send RARP request packet over a single interface. 592 */ 593static void __init ic_rarp_send_if(struct ic_device *d) 594{ 595 struct net_device *dev = d->dev; 596 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 597 dev->dev_addr, dev->dev_addr); 598} 599#endif 600 601/* 602 * Predefine Nameservers 603 */ 604static inline void __init ic_nameservers_predef(void) 605{ 606 int i; 607 608 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 609 ic_nameservers[i] = NONE; 610} 611 612/* Predefine NTP servers */ 613static inline void __init ic_ntp_servers_predef(void) 614{ 615 int i; 616 617 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) 618 ic_ntp_servers[i] = NONE; 619} 620 621/* 622 * DHCP/BOOTP support. 623 */ 624 625#ifdef IPCONFIG_BOOTP 626 627struct bootp_pkt { /* BOOTP packet format */ 628 struct iphdr iph; /* IP header */ 629 struct udphdr udph; /* UDP header */ 630 u8 op; /* 1=request, 2=reply */ 631 u8 htype; /* HW address type */ 632 u8 hlen; /* HW address length */ 633 u8 hops; /* Used only by gateways */ 634 __be32 xid; /* Transaction ID */ 635 __be16 secs; /* Seconds since we started */ 636 __be16 flags; /* Just what it says */ 637 __be32 client_ip; /* Client's IP address if known */ 638 __be32 your_ip; /* Assigned IP address */ 639 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 640 __be32 relay_ip; /* IP address of BOOTP relay */ 641 u8 hw_addr[16]; /* Client's HW address */ 642 u8 serv_name[64]; /* Server host name */ 643 u8 boot_file[128]; /* Name of boot file */ 644 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 645}; 646 647/* packet ops */ 648#define BOOTP_REQUEST 1 649#define BOOTP_REPLY 2 650 651/* DHCP message types */ 652#define DHCPDISCOVER 1 653#define DHCPOFFER 2 654#define DHCPREQUEST 3 655#define DHCPDECLINE 4 656#define DHCPACK 5 657#define DHCPNAK 6 658#define DHCPRELEASE 7 659#define DHCPINFORM 8 660 661static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 662 663static struct packet_type bootp_packet_type __initdata = { 664 .type = cpu_to_be16(ETH_P_IP), 665 .func = ic_bootp_recv, 666}; 667 668/* DHCPACK can overwrite DNS if fallback was set upon first BOOTP reply */ 669static int ic_nameservers_fallback __initdata; 670 671/* 672 * Initialize DHCP/BOOTP extension fields in the request. 673 */ 674 675static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 676 677#ifdef IPCONFIG_DHCP 678 679static void __init 680ic_dhcp_init_options(u8 *options, struct ic_device *d) 681{ 682 u8 mt = ((ic_servaddr == NONE) 683 ? DHCPDISCOVER : DHCPREQUEST); 684 u8 *e = options; 685 int len; 686 687 pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name); 688 689 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 690 e += 4; 691 692 *e++ = 53; /* DHCP message type */ 693 *e++ = 1; 694 *e++ = mt; 695 696 if (mt == DHCPREQUEST) { 697 *e++ = 54; /* Server ID (IP address) */ 698 *e++ = 4; 699 memcpy(e, &ic_servaddr, 4); 700 e += 4; 701 702 *e++ = 50; /* Requested IP address */ 703 *e++ = 4; 704 memcpy(e, &ic_myaddr, 4); 705 e += 4; 706 } 707 708 /* always? */ 709 { 710 static const u8 ic_req_params[] = { 711 1, /* Subnet mask */ 712 3, /* Default gateway */ 713 6, /* DNS server */ 714 12, /* Host name */ 715 15, /* Domain name */ 716 17, /* Boot path */ 717 26, /* MTU */ 718 40, /* NIS domain name */ 719 42, /* NTP servers */ 720 }; 721 722 *e++ = 55; /* Parameter request list */ 723 *e++ = sizeof(ic_req_params); 724 memcpy(e, ic_req_params, sizeof(ic_req_params)); 725 e += sizeof(ic_req_params); 726 727 if (ic_host_name_set) { 728 *e++ = 12; /* host-name */ 729 len = strlen(utsname()->nodename); 730 *e++ = len; 731 memcpy(e, utsname()->nodename, len); 732 e += len; 733 } 734 if (*vendor_class_identifier) { 735 pr_info("DHCP: sending class identifier \"%s\"\n", 736 vendor_class_identifier); 737 *e++ = 60; /* Class-identifier */ 738 len = strlen(vendor_class_identifier); 739 *e++ = len; 740 memcpy(e, vendor_class_identifier, len); 741 e += len; 742 } 743 len = strlen(dhcp_client_identifier + 1); 744 /* the minimum length of identifier is 2, include 1 byte type, 745 * and can not be larger than the length of options 746 */ 747 if (len >= 1 && len < 312 - (e - options) - 1) { 748 *e++ = 61; 749 *e++ = len + 1; 750 memcpy(e, dhcp_client_identifier, len + 1); 751 e += len + 1; 752 } 753 } 754 755 *e++ = 255; /* End of the list */ 756} 757 758#endif /* IPCONFIG_DHCP */ 759 760static void __init ic_bootp_init_ext(u8 *e) 761{ 762 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 763 e += 4; 764 *e++ = 1; /* Subnet mask request */ 765 *e++ = 4; 766 e += 4; 767 *e++ = 3; /* Default gateway request */ 768 *e++ = 4; 769 e += 4; 770#if CONF_NAMESERVERS_MAX > 0 771 *e++ = 6; /* (DNS) name server request */ 772 *e++ = 4 * CONF_NAMESERVERS_MAX; 773 e += 4 * CONF_NAMESERVERS_MAX; 774#endif 775 *e++ = 12; /* Host name request */ 776 *e++ = 32; 777 e += 32; 778 *e++ = 40; /* NIS Domain name request */ 779 *e++ = 32; 780 e += 32; 781 *e++ = 17; /* Boot path */ 782 *e++ = 40; 783 e += 40; 784 785 *e++ = 57; /* set extension buffer size for reply */ 786 *e++ = 2; 787 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 788 *e++ = 150; 789 790 *e++ = 255; /* End of the list */ 791} 792 793 794/* 795 * Initialize the DHCP/BOOTP mechanism. 796 */ 797static inline void __init ic_bootp_init(void) 798{ 799 /* Re-initialise all name servers and NTP servers to NONE, in case any 800 * were set via the "ip=" or "nfsaddrs=" kernel command line parameters: 801 * any IP addresses specified there will already have been decoded but 802 * are no longer needed 803 */ 804 ic_nameservers_predef(); 805 ic_ntp_servers_predef(); 806 807 dev_add_pack(&bootp_packet_type); 808} 809 810 811/* 812 * DHCP/BOOTP cleanup. 813 */ 814static inline void __init ic_bootp_cleanup(void) 815{ 816 dev_remove_pack(&bootp_packet_type); 817} 818 819 820/* 821 * Send DHCP/BOOTP request to single interface. 822 */ 823static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 824{ 825 struct net_device *dev = d->dev; 826 struct sk_buff *skb; 827 struct bootp_pkt *b; 828 struct iphdr *h; 829 int hlen = LL_RESERVED_SPACE(dev); 830 int tlen = dev->needed_tailroom; 831 832 /* Allocate packet */ 833 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, 834 GFP_KERNEL); 835 if (!skb) 836 return; 837 skb_reserve(skb, hlen); 838 b = skb_put_zero(skb, sizeof(struct bootp_pkt)); 839 840 /* Construct IP header */ 841 skb_reset_network_header(skb); 842 h = ip_hdr(skb); 843 h->version = 4; 844 h->ihl = 5; 845 h->tot_len = htons(sizeof(struct bootp_pkt)); 846 h->frag_off = htons(IP_DF); 847 h->ttl = 64; 848 h->protocol = IPPROTO_UDP; 849 h->daddr = htonl(INADDR_BROADCAST); 850 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 851 852 /* Construct UDP header */ 853 b->udph.source = htons(68); 854 b->udph.dest = htons(67); 855 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 856 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 857 858 /* Construct DHCP/BOOTP header */ 859 b->op = BOOTP_REQUEST; 860 if (dev->type < 256) /* check for false types */ 861 b->htype = dev->type; 862 else if (dev->type == ARPHRD_FDDI) 863 b->htype = ARPHRD_ETHER; 864 else { 865 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type, 866 dev->name); 867 b->htype = dev->type; /* can cause undefined behavior */ 868 } 869 870 /* server_ip and your_ip address are both already zero per RFC2131 */ 871 b->hlen = dev->addr_len; 872 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 873 b->secs = htons(jiffies_diff / HZ); 874 b->xid = d->xid; 875 876 /* add DHCP options or BOOTP extensions */ 877#ifdef IPCONFIG_DHCP 878 if (ic_proto_enabled & IC_USE_DHCP) 879 ic_dhcp_init_options(b->exten, d); 880 else 881#endif 882 ic_bootp_init_ext(b->exten); 883 884 /* Chain packet down the line... */ 885 skb->dev = dev; 886 skb->protocol = htons(ETH_P_IP); 887 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 888 dev->broadcast, dev->dev_addr, skb->len) < 0) { 889 kfree_skb(skb); 890 printk("E"); 891 return; 892 } 893 894 if (dev_queue_xmit(skb) < 0) 895 printk("E"); 896} 897 898 899/* 900 * Copy BOOTP-supplied string 901 */ 902static int __init ic_bootp_string(char *dest, char *src, int len, int max) 903{ 904 if (!len) 905 return 0; 906 if (len > max-1) 907 len = max-1; 908 memcpy(dest, src, len); 909 dest[len] = '\0'; 910 return 1; 911} 912 913 914/* 915 * Process BOOTP extensions. 916 */ 917static void __init ic_do_bootp_ext(u8 *ext) 918{ 919 u8 servers; 920 int i; 921 __be16 mtu; 922 923 u8 *c; 924 925 pr_debug("DHCP/BOOTP: Got extension %d:", *ext); 926 for (c=ext+2; c<ext+2+ext[1]; c++) 927 pr_debug(" %02x", *c); 928 pr_debug("\n"); 929 930 switch (*ext++) { 931 case 1: /* Subnet mask */ 932 if (ic_netmask == NONE) 933 memcpy(&ic_netmask, ext+1, 4); 934 break; 935 case 3: /* Default gateway */ 936 if (ic_gateway == NONE) 937 memcpy(&ic_gateway, ext+1, 4); 938 break; 939 case 6: /* DNS server */ 940 servers= *ext/4; 941 if (servers > CONF_NAMESERVERS_MAX) 942 servers = CONF_NAMESERVERS_MAX; 943 for (i = 0; i < servers; i++) { 944 if (ic_nameservers[i] == NONE || 945 ic_nameservers_fallback) 946 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 947 } 948 break; 949 case 12: /* Host name */ 950 if (!ic_host_name_set) { 951 ic_bootp_string(utsname()->nodename, ext+1, *ext, 952 __NEW_UTS_LEN); 953 ic_host_name_set = 1; 954 } 955 break; 956 case 15: /* Domain name (DNS) */ 957 if (!ic_domain[0]) 958 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 959 break; 960 case 17: /* Root path */ 961 if (!root_server_path[0]) 962 ic_bootp_string(root_server_path, ext+1, *ext, 963 sizeof(root_server_path)); 964 break; 965 case 26: /* Interface MTU */ 966 memcpy(&mtu, ext+1, sizeof(mtu)); 967 ic_dev_mtu = ntohs(mtu); 968 break; 969 case 40: /* NIS Domain name (_not_ DNS) */ 970 ic_bootp_string(utsname()->domainname, ext+1, *ext, 971 __NEW_UTS_LEN); 972 break; 973 case 42: /* NTP servers */ 974 servers = *ext / 4; 975 if (servers > CONF_NTP_SERVERS_MAX) 976 servers = CONF_NTP_SERVERS_MAX; 977 for (i = 0; i < servers; i++) { 978 if (ic_ntp_servers[i] == NONE) 979 memcpy(&ic_ntp_servers[i], ext+1+4*i, 4); 980 } 981 break; 982 } 983} 984 985 986/* 987 * Receive BOOTP reply. 988 */ 989static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 990{ 991 struct bootp_pkt *b; 992 struct iphdr *h; 993 struct ic_device *d; 994 int len, ext_len; 995 996 if (!net_eq(dev_net(dev), &init_net)) 997 goto drop; 998 999 /* Perform verifications before taking the lock. */ 1000 if (skb->pkt_type == PACKET_OTHERHOST) 1001 goto drop; 1002 1003 skb = skb_share_check(skb, GFP_ATOMIC); 1004 if (!skb) 1005 return NET_RX_DROP; 1006 1007 if (!pskb_may_pull(skb, 1008 sizeof(struct iphdr) + 1009 sizeof(struct udphdr))) 1010 goto drop; 1011 1012 b = (struct bootp_pkt *)skb_network_header(skb); 1013 h = &b->iph; 1014 1015 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 1016 goto drop; 1017 1018 /* Fragments are not supported */ 1019 if (ip_is_fragment(h)) { 1020 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); 1021 goto drop; 1022 } 1023 1024 if (skb->len < ntohs(h->tot_len)) 1025 goto drop; 1026 1027 if (ip_fast_csum((char *) h, h->ihl)) 1028 goto drop; 1029 1030 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 1031 goto drop; 1032 1033 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 1034 goto drop; 1035 1036 len = ntohs(b->udph.len) - sizeof(struct udphdr); 1037 ext_len = len - (sizeof(*b) - 1038 sizeof(struct iphdr) - 1039 sizeof(struct udphdr) - 1040 sizeof(b->exten)); 1041 if (ext_len < 0) 1042 goto drop; 1043 1044 /* Ok the front looks good, make sure we can get at the rest. */ 1045 if (!pskb_may_pull(skb, skb->len)) 1046 goto drop; 1047 1048 b = (struct bootp_pkt *)skb_network_header(skb); 1049 h = &b->iph; 1050 1051 /* One reply at a time, please. */ 1052 spin_lock(&ic_recv_lock); 1053 1054 /* If we already have a reply, just drop the packet */ 1055 if (ic_got_reply) 1056 goto drop_unlock; 1057 1058 /* Find the ic_device that the packet arrived on */ 1059 d = ic_first_dev; 1060 while (d && d->dev != dev) 1061 d = d->next; 1062 if (!d) 1063 goto drop_unlock; /* should never happen */ 1064 1065 /* Is it a reply to our BOOTP request? */ 1066 if (b->op != BOOTP_REPLY || 1067 b->xid != d->xid) { 1068 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n", 1069 d->dev->name, b->op, b->xid); 1070 goto drop_unlock; 1071 } 1072 1073 /* Parse extensions */ 1074 if (ext_len >= 4 && 1075 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1076 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1077 u8 *ext; 1078 1079#ifdef IPCONFIG_DHCP 1080 if (ic_proto_enabled & IC_USE_DHCP) { 1081 __be32 server_id = NONE; 1082 int mt = 0; 1083 1084 ext = &b->exten[4]; 1085 while (ext < end && *ext != 0xff) { 1086 u8 *opt = ext++; 1087 if (*opt == 0) /* Padding */ 1088 continue; 1089 ext += *ext + 1; 1090 if (ext >= end) 1091 break; 1092 switch (*opt) { 1093 case 53: /* Message type */ 1094 if (opt[1]) 1095 mt = opt[2]; 1096 break; 1097 case 54: /* Server ID (IP address) */ 1098 if (opt[1] >= 4) 1099 memcpy(&server_id, opt + 2, 4); 1100 break; 1101 } 1102 } 1103 1104 pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name); 1105 1106 switch (mt) { 1107 case DHCPOFFER: 1108 /* While in the process of accepting one offer, 1109 * ignore all others. 1110 */ 1111 if (ic_myaddr != NONE) 1112 goto drop_unlock; 1113 1114 /* Let's accept that offer. */ 1115 ic_myaddr = b->your_ip; 1116 ic_servaddr = server_id; 1117 pr_debug("DHCP: Offered address %pI4 by server %pI4\n", 1118 &ic_myaddr, &b->iph.saddr); 1119 /* The DHCP indicated server address takes 1120 * precedence over the bootp header one if 1121 * they are different. 1122 */ 1123 if ((server_id != NONE) && 1124 (b->server_ip != server_id)) 1125 b->server_ip = ic_servaddr; 1126 break; 1127 1128 case DHCPACK: 1129 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1130 goto drop_unlock; 1131 1132 /* Yeah! */ 1133 break; 1134 1135 default: 1136 /* Urque. Forget it*/ 1137 ic_myaddr = NONE; 1138 ic_servaddr = NONE; 1139 goto drop_unlock; 1140 } 1141 1142 ic_dhcp_msgtype = mt; 1143 1144 } 1145#endif /* IPCONFIG_DHCP */ 1146 1147 ext = &b->exten[4]; 1148 while (ext < end && *ext != 0xff) { 1149 u8 *opt = ext++; 1150 if (*opt == 0) /* Padding */ 1151 continue; 1152 ext += *ext + 1; 1153 if (ext < end) 1154 ic_do_bootp_ext(opt); 1155 } 1156 } 1157 1158 /* We have a winner! */ 1159 ic_dev = d; 1160 ic_myaddr = b->your_ip; 1161 ic_servaddr = b->server_ip; 1162 ic_addrservaddr = b->iph.saddr; 1163 if (ic_gateway == NONE && b->relay_ip) 1164 ic_gateway = b->relay_ip; 1165 if (ic_nameservers[0] == NONE) { 1166 ic_nameservers[0] = ic_servaddr; 1167 ic_nameservers_fallback = 1; 1168 } 1169 ic_got_reply = IC_BOOTP; 1170 1171drop_unlock: 1172 /* Show's over. Nothing to see here. */ 1173 spin_unlock(&ic_recv_lock); 1174 1175drop: 1176 /* Throw the packet out. */ 1177 kfree_skb(skb); 1178 1179 return 0; 1180} 1181 1182 1183#endif 1184 1185 1186/* 1187 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1188 */ 1189 1190#ifdef IPCONFIG_DYNAMIC 1191 1192static int __init ic_dynamic(void) 1193{ 1194 int retries; 1195 struct ic_device *d; 1196 unsigned long start_jiffies, timeout, jiff; 1197 int do_bootp = ic_proto_have_if & IC_BOOTP; 1198 int do_rarp = ic_proto_have_if & IC_RARP; 1199 1200 /* 1201 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1202 * This routine gets only called when some pieces of information 1203 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1204 */ 1205 if (!ic_proto_enabled) { 1206 pr_err("IP-Config: Incomplete network configuration information\n"); 1207 return -1; 1208 } 1209 1210#ifdef IPCONFIG_BOOTP 1211 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1212 pr_err("DHCP/BOOTP: No suitable device found\n"); 1213#endif 1214#ifdef IPCONFIG_RARP 1215 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1216 pr_err("RARP: No suitable device found\n"); 1217#endif 1218 1219 if (!ic_proto_have_if) 1220 /* Error message already printed */ 1221 return -1; 1222 1223 /* 1224 * Setup protocols 1225 */ 1226#ifdef IPCONFIG_BOOTP 1227 if (do_bootp) 1228 ic_bootp_init(); 1229#endif 1230#ifdef IPCONFIG_RARP 1231 if (do_rarp) 1232 ic_rarp_init(); 1233#endif 1234 1235 /* 1236 * Send requests and wait, until we get an answer. This loop 1237 * seems to be a terrible waste of CPU time, but actually there is 1238 * only one process running at all, so we don't need to use any 1239 * scheduler functions. 1240 * [Actually we could now, but the nothing else running note still 1241 * applies.. - AC] 1242 */ 1243 pr_notice("Sending %s%s%s requests .", 1244 do_bootp 1245 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1246 (do_bootp && do_rarp) ? " and " : "", 1247 do_rarp ? "RARP" : ""); 1248 1249 start_jiffies = jiffies; 1250 d = ic_first_dev; 1251 retries = CONF_SEND_RETRIES; 1252 get_random_bytes(&timeout, sizeof(timeout)); 1253 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); 1254 for (;;) { 1255#ifdef IPCONFIG_BOOTP 1256 if (do_bootp && (d->able & IC_BOOTP)) 1257 ic_bootp_send_if(d, jiffies - start_jiffies); 1258#endif 1259#ifdef IPCONFIG_RARP 1260 if (do_rarp && (d->able & IC_RARP)) 1261 ic_rarp_send_if(d); 1262#endif 1263 1264 if (!d->next) { 1265 jiff = jiffies + timeout; 1266 while (time_before(jiffies, jiff) && !ic_got_reply) 1267 schedule_timeout_uninterruptible(1); 1268 } 1269#ifdef IPCONFIG_DHCP 1270 /* DHCP isn't done until we get a DHCPACK. */ 1271 if ((ic_got_reply & IC_BOOTP) && 1272 (ic_proto_enabled & IC_USE_DHCP) && 1273 ic_dhcp_msgtype != DHCPACK) { 1274 ic_got_reply = 0; 1275 /* continue on device that got the reply */ 1276 d = ic_dev; 1277 pr_cont(","); 1278 continue; 1279 } 1280#endif /* IPCONFIG_DHCP */ 1281 1282 if (ic_got_reply) { 1283 pr_cont(" OK\n"); 1284 break; 1285 } 1286 1287 if ((d = d->next)) 1288 continue; 1289 1290 if (! --retries) { 1291 pr_cont(" timed out!\n"); 1292 break; 1293 } 1294 1295 d = ic_first_dev; 1296 1297 timeout = timeout CONF_TIMEOUT_MULT; 1298 if (timeout > CONF_TIMEOUT_MAX) 1299 timeout = CONF_TIMEOUT_MAX; 1300 1301 pr_cont("."); 1302 } 1303 1304#ifdef IPCONFIG_BOOTP 1305 if (do_bootp) 1306 ic_bootp_cleanup(); 1307#endif 1308#ifdef IPCONFIG_RARP 1309 if (do_rarp) 1310 ic_rarp_cleanup(); 1311#endif 1312 1313 if (!ic_got_reply) { 1314 ic_myaddr = NONE; 1315 return -1; 1316 } 1317 1318 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n", 1319 ((ic_got_reply & IC_RARP) ? "RARP" 1320 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1321 &ic_addrservaddr, &ic_myaddr); 1322 1323 return 0; 1324} 1325 1326#endif /* IPCONFIG_DYNAMIC */ 1327 1328#ifdef CONFIG_PROC_FS 1329/* proc_dir_entry for /proc/net/ipconfig */ 1330static struct proc_dir_entry *ipconfig_dir; 1331 1332/* Name servers: */ 1333static int pnp_seq_show(struct seq_file *seq, void *v) 1334{ 1335 int i; 1336 1337 if (ic_proto_used & IC_PROTO) 1338 seq_printf(seq, "#PROTO: %s\n", 1339 (ic_proto_used & IC_RARP) ? "RARP" 1340 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1341 else 1342 seq_puts(seq, "#MANUAL\n"); 1343 1344 if (ic_domain[0]) 1345 seq_printf(seq, 1346 "domain %s\n", ic_domain); 1347 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1348 if (ic_nameservers[i] != NONE) 1349 seq_printf(seq, "nameserver %pI4\n", 1350 &ic_nameservers[i]); 1351 } 1352 if (ic_servaddr != NONE) 1353 seq_printf(seq, "bootserver %pI4\n", 1354 &ic_servaddr); 1355 return 0; 1356} 1357 1358/* Create the /proc/net/ipconfig directory */ 1359static int __init ipconfig_proc_net_init(void) 1360{ 1361 ipconfig_dir = proc_net_mkdir(&init_net, "ipconfig", init_net.proc_net); 1362 if (!ipconfig_dir) 1363 return -ENOMEM; 1364 1365 return 0; 1366} 1367 1368/* Create a new file under /proc/net/ipconfig */ 1369static int ipconfig_proc_net_create(const char *name, 1370 const struct proc_ops *proc_ops) 1371{ 1372 char *pname; 1373 struct proc_dir_entry *p; 1374 1375 if (!ipconfig_dir) 1376 return -ENOMEM; 1377 1378 pname = kasprintf(GFP_KERNEL, "%s%s", "ipconfig/", name); 1379 if (!pname) 1380 return -ENOMEM; 1381 1382 p = proc_create(pname, 0444, init_net.proc_net, proc_ops); 1383 kfree(pname); 1384 if (!p) 1385 return -ENOMEM; 1386 1387 return 0; 1388} 1389 1390/* Write NTP server IP addresses to /proc/net/ipconfig/ntp_servers */ 1391static int ntp_servers_show(struct seq_file *seq, void *v) 1392{ 1393 int i; 1394 1395 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) { 1396 if (ic_ntp_servers[i] != NONE) 1397 seq_printf(seq, "%pI4\n", &ic_ntp_servers[i]); 1398 } 1399 return 0; 1400} 1401DEFINE_PROC_SHOW_ATTRIBUTE(ntp_servers); 1402#endif /* CONFIG_PROC_FS */ 1403 1404/* 1405 * Extract IP address from the parameter string if needed. Note that we 1406 * need to have root_server_addr set _before_ IPConfig gets called as it 1407 * can override it. 1408 */ 1409__be32 __init root_nfs_parse_addr(char *name) 1410{ 1411 __be32 addr; 1412 int octets = 0; 1413 char *cp, *cq; 1414 1415 cp = cq = name; 1416 while (octets < 4) { 1417 while (*cp >= '0' && *cp <= '9') 1418 cp++; 1419 if (cp == cq || cp - cq > 3) 1420 break; 1421 if (*cp == '.' || octets == 3) 1422 octets++; 1423 if (octets < 4) 1424 cp++; 1425 cq = cp; 1426 } 1427 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1428 if (*cp == ':') 1429 *cp++ = '\0'; 1430 addr = in_aton(name); 1431 memmove(name, cp, strlen(cp) + 1); 1432 } else 1433 addr = NONE; 1434 1435 return addr; 1436} 1437 1438#define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1439 1440static int __init wait_for_devices(void) 1441{ 1442 int i; 1443 bool try_init_devs = true; 1444 1445 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1446 struct net_device *dev; 1447 int found = 0; 1448 1449 /* make sure deferred device probes are finished */ 1450 wait_for_device_probe(); 1451 1452 rtnl_lock(); 1453 for_each_netdev(&init_net, dev) { 1454 if (ic_is_init_dev(dev)) { 1455 found = 1; 1456 break; 1457 } 1458 } 1459 rtnl_unlock(); 1460 if (found) 1461 return 0; 1462 if (try_init_devs && 1463 (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) { 1464 try_init_devs = false; 1465 wait_for_init_devices_probe(); 1466 } 1467 ssleep(1); 1468 } 1469 return -ENODEV; 1470} 1471 1472/* 1473 * IP Autoconfig dispatcher. 1474 */ 1475 1476static int __init ip_auto_config(void) 1477{ 1478 __be32 addr; 1479#ifdef IPCONFIG_DYNAMIC 1480 int retries = CONF_OPEN_RETRIES; 1481#endif 1482 int err; 1483 unsigned int i, count; 1484 1485 /* Initialise all name servers and NTP servers to NONE (but only if the 1486 * "ip=" or "nfsaddrs=" kernel command line parameters weren't decoded, 1487 * otherwise we'll overwrite the IP addresses specified there) 1488 */ 1489 if (ic_set_manually == 0) { 1490 ic_nameservers_predef(); 1491 ic_ntp_servers_predef(); 1492 } 1493 1494#ifdef CONFIG_PROC_FS 1495 proc_create_single("pnp", 0444, init_net.proc_net, pnp_seq_show); 1496 1497 if (ipconfig_proc_net_init() == 0) 1498 ipconfig_proc_net_create("ntp_servers", &ntp_servers_proc_ops); 1499#endif /* CONFIG_PROC_FS */ 1500 1501 if (!ic_enable) 1502 return 0; 1503 1504 pr_debug("IP-Config: Entered.\n"); 1505#ifdef IPCONFIG_DYNAMIC 1506 try_try_again: 1507#endif 1508 /* Wait for devices to appear */ 1509 err = wait_for_devices(); 1510 if (err) 1511 return err; 1512 1513 /* Setup all network devices */ 1514 err = ic_open_devs(); 1515 if (err) 1516 return err; 1517 1518 /* Give drivers a chance to settle */ 1519 msleep(CONF_POST_OPEN); 1520 1521 /* 1522 * If the config information is insufficient (e.g., our IP address or 1523 * IP address of the boot server is missing or we have multiple network 1524 * interfaces and no default was set), use BOOTP or RARP to get the 1525 * missing values. 1526 */ 1527 if (ic_myaddr == NONE || 1528#if defined(CONFIG_ROOT_NFS) || defined(CONFIG_CIFS_ROOT) 1529 (root_server_addr == NONE && 1530 ic_servaddr == NONE && 1531 (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) || 1532#endif 1533 ic_first_dev->next) { 1534#ifdef IPCONFIG_DYNAMIC 1535 if (ic_dynamic() < 0) { 1536 ic_close_devs(); 1537 1538 /* 1539 * I don't know why, but sometimes the 1540 * eepro100 driver (at least) gets upset and 1541 * doesn't work the first time it's opened. 1542 * But then if you close it and reopen it, it 1543 * works just fine. So we need to try that at 1544 * least once before giving up. 1545 * 1546 * Also, if the root will be NFS-mounted, we 1547 * have nowhere to go if DHCP fails. So we 1548 * just have to keep trying forever. 1549 * 1550 * -- Chip 1551 */ 1552#ifdef CONFIG_ROOT_NFS 1553 if (ROOT_DEV == Root_NFS) { 1554 pr_err("IP-Config: Retrying forever (NFS root)...\n"); 1555 goto try_try_again; 1556 } 1557#endif 1558#ifdef CONFIG_CIFS_ROOT 1559 if (ROOT_DEV == Root_CIFS) { 1560 pr_err("IP-Config: Retrying forever (CIFS root)...\n"); 1561 goto try_try_again; 1562 } 1563#endif 1564 1565 if (--retries) { 1566 pr_err("IP-Config: Reopening network devices...\n"); 1567 goto try_try_again; 1568 } 1569 1570 /* Oh, well. At least we tried. */ 1571 pr_err("IP-Config: Auto-configuration of network failed\n"); 1572 return -1; 1573 } 1574#else /* !DYNAMIC */ 1575 pr_err("IP-Config: Incomplete network configuration information\n"); 1576 ic_close_devs(); 1577 return -1; 1578#endif /* IPCONFIG_DYNAMIC */ 1579 } else { 1580 /* Device selected manually or only one device -> use it */ 1581 ic_dev = ic_first_dev; 1582 } 1583 1584 addr = root_nfs_parse_addr(root_server_path); 1585 if (root_server_addr == NONE) 1586 root_server_addr = addr; 1587 1588 /* 1589 * Use defaults wherever applicable. 1590 */ 1591 if (ic_defaults() < 0) 1592 return -1; 1593 1594 /* 1595 * Record which protocol was actually used. 1596 */ 1597#ifdef IPCONFIG_DYNAMIC 1598 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1599#endif 1600 1601#ifndef IPCONFIG_SILENT 1602 /* 1603 * Clue in the operator. 1604 */ 1605 pr_info("IP-Config: Complete:\n"); 1606 1607 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", 1608 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr, 1609 &ic_myaddr, &ic_netmask, &ic_gateway); 1610 pr_info(" host=%s, domain=%s, nis-domain=%s\n", 1611 utsname()->nodename, ic_domain, utsname()->domainname); 1612 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", 1613 &ic_servaddr, &root_server_addr, root_server_path); 1614 if (ic_dev_mtu) 1615 pr_cont(", mtu=%d", ic_dev_mtu); 1616 /* Name servers (if any): */ 1617 for (i = 0, count = 0; i < CONF_NAMESERVERS_MAX; i++) { 1618 if (ic_nameservers[i] != NONE) { 1619 if (i == 0) 1620 pr_info(" nameserver%u=%pI4", 1621 i, &ic_nameservers[i]); 1622 else 1623 pr_cont(", nameserver%u=%pI4", 1624 i, &ic_nameservers[i]); 1625 1626 count++; 1627 } 1628 if ((i + 1 == CONF_NAMESERVERS_MAX) && count > 0) 1629 pr_cont("\n"); 1630 } 1631 /* NTP servers (if any): */ 1632 for (i = 0, count = 0; i < CONF_NTP_SERVERS_MAX; i++) { 1633 if (ic_ntp_servers[i] != NONE) { 1634 if (i == 0) 1635 pr_info(" ntpserver%u=%pI4", 1636 i, &ic_ntp_servers[i]); 1637 else 1638 pr_cont(", ntpserver%u=%pI4", 1639 i, &ic_ntp_servers[i]); 1640 1641 count++; 1642 } 1643 if ((i + 1 == CONF_NTP_SERVERS_MAX) && count > 0) 1644 pr_cont("\n"); 1645 } 1646#endif /* !SILENT */ 1647 1648 /* 1649 * Close all network devices except the device we've 1650 * autoconfigured and set up routes. 1651 */ 1652 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1653 err = -1; 1654 else 1655 err = 0; 1656 1657 ic_close_devs(); 1658 1659 return err; 1660} 1661 1662late_initcall(ip_auto_config); 1663 1664 1665/* 1666 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1667 * command line parameter. See Documentation/admin-guide/nfs/nfsroot.rst. 1668 */ 1669static int __init ic_proto_name(char *name) 1670{ 1671 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1672 return 1; 1673 } 1674 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1675 return 0; 1676 } 1677#ifdef CONFIG_IP_PNP_DHCP 1678 else if (!strncmp(name, "dhcp", 4)) { 1679 char *client_id; 1680 1681 ic_proto_enabled &= ~IC_RARP; 1682 client_id = strstr(name, "dhcp,"); 1683 if (client_id) { 1684 char *v; 1685 1686 client_id = client_id + 5; 1687 v = strchr(client_id, ','); 1688 if (!v) 1689 return 1; 1690 *v = 0; 1691 if (kstrtou8(client_id, 0, dhcp_client_identifier)) 1692 pr_debug("DHCP: Invalid client identifier type\n"); 1693 strncpy(dhcp_client_identifier + 1, v + 1, 251); 1694 *v = ','; 1695 } 1696 return 1; 1697 } 1698#endif 1699#ifdef CONFIG_IP_PNP_BOOTP 1700 else if (!strcmp(name, "bootp")) { 1701 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1702 return 1; 1703 } 1704#endif 1705#ifdef CONFIG_IP_PNP_RARP 1706 else if (!strcmp(name, "rarp")) { 1707 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1708 return 1; 1709 } 1710#endif 1711#ifdef IPCONFIG_DYNAMIC 1712 else if (!strcmp(name, "both")) { 1713 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1714 return 1; 1715 } 1716#endif 1717 return 0; 1718} 1719 1720static int __init ip_auto_config_setup(char *addrs) 1721{ 1722 char *cp, *ip, *dp; 1723 int num = 0; 1724 1725 ic_set_manually = 1; 1726 ic_enable = 1; 1727 1728 /* 1729 * If any dhcp, bootp etc options are set, leave autoconfig on 1730 * and skip the below static IP processing. 1731 */ 1732 if (ic_proto_name(addrs)) 1733 return 1; 1734 1735 /* If no static IP is given, turn off autoconfig and bail. */ 1736 if (*addrs == 0 || 1737 strcmp(addrs, "off") == 0 || 1738 strcmp(addrs, "none") == 0) { 1739 ic_enable = 0; 1740 return 1; 1741 } 1742 1743 /* Initialise all name servers and NTP servers to NONE */ 1744 ic_nameservers_predef(); 1745 ic_ntp_servers_predef(); 1746 1747 /* Parse string for static IP assignment. */ 1748 ip = addrs; 1749 while (ip && *ip) { 1750 if ((cp = strchr(ip, ':'))) 1751 *cp++ = '\0'; 1752 if (strlen(ip) > 0) { 1753 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip); 1754 switch (num) { 1755 case 0: 1756 if ((ic_myaddr = in_aton(ip)) == ANY) 1757 ic_myaddr = NONE; 1758 break; 1759 case 1: 1760 if ((ic_servaddr = in_aton(ip)) == ANY) 1761 ic_servaddr = NONE; 1762 break; 1763 case 2: 1764 if ((ic_gateway = in_aton(ip)) == ANY) 1765 ic_gateway = NONE; 1766 break; 1767 case 3: 1768 if ((ic_netmask = in_aton(ip)) == ANY) 1769 ic_netmask = NONE; 1770 break; 1771 case 4: 1772 if ((dp = strchr(ip, '.'))) { 1773 *dp++ = '\0'; 1774 strscpy(utsname()->domainname, dp, 1775 sizeof(utsname()->domainname)); 1776 } 1777 strscpy(utsname()->nodename, ip, 1778 sizeof(utsname()->nodename)); 1779 ic_host_name_set = 1; 1780 break; 1781 case 5: 1782 strscpy(user_dev_name, ip, sizeof(user_dev_name)); 1783 break; 1784 case 6: 1785 if (ic_proto_name(ip) == 0 && 1786 ic_myaddr == NONE) { 1787 ic_enable = 0; 1788 } 1789 break; 1790 case 7: 1791 if (CONF_NAMESERVERS_MAX >= 1) { 1792 ic_nameservers[0] = in_aton(ip); 1793 if (ic_nameservers[0] == ANY) 1794 ic_nameservers[0] = NONE; 1795 } 1796 break; 1797 case 8: 1798 if (CONF_NAMESERVERS_MAX >= 2) { 1799 ic_nameservers[1] = in_aton(ip); 1800 if (ic_nameservers[1] == ANY) 1801 ic_nameservers[1] = NONE; 1802 } 1803 break; 1804 case 9: 1805 if (CONF_NTP_SERVERS_MAX >= 1) { 1806 ic_ntp_servers[0] = in_aton(ip); 1807 if (ic_ntp_servers[0] == ANY) 1808 ic_ntp_servers[0] = NONE; 1809 } 1810 break; 1811 } 1812 } 1813 ip = cp; 1814 num++; 1815 } 1816 1817 return 1; 1818} 1819__setup("ip=", ip_auto_config_setup); 1820 1821static int __init nfsaddrs_config_setup(char *addrs) 1822{ 1823 return ip_auto_config_setup(addrs); 1824} 1825__setup("nfsaddrs=", nfsaddrs_config_setup); 1826 1827static int __init vendor_class_identifier_setup(char *addrs) 1828{ 1829 if (strscpy(vendor_class_identifier, addrs, 1830 sizeof(vendor_class_identifier)) 1831 >= sizeof(vendor_class_identifier)) 1832 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n", 1833 vendor_class_identifier); 1834 return 1; 1835} 1836__setup("dhcpclass=", vendor_class_identifier_setup); 1837 1838static int __init set_carrier_timeout(char *str) 1839{ 1840 ssize_t ret; 1841 1842 if (!str) 1843 return 0; 1844 1845 ret = kstrtouint(str, 0, &carrier_timeout); 1846 if (ret) 1847 return 0; 1848 1849 return 1; 1850} 1851__setup("carrier_timeout=", set_carrier_timeout); 1852