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