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 */ 104 static 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 */ 114 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ 115 116 static int ic_enable __initdata; /* IP config enabled? */ 117 118 /* Protocol choice */ 119 int 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 ; 130 131 static int ic_host_name_set __initdata; /* Host name set by us? */ 132 133 __be32 ic_myaddr = NONE; /* My IP address */ 134 static __be32 ic_netmask = NONE; /* Netmask for local subnet */ 135 __be32 ic_gateway = NONE; /* Gateway IP address */ 136 137 #ifdef IPCONFIG_DYNAMIC 138 static __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 */ 144 u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 145 146 /* vendor class identifier */ 147 static char vendor_class_identifier[253] __initdata; 148 149 #if defined(CONFIG_IP_PNP_DHCP) 150 static char dhcp_client_identifier[253] __initdata; 151 #endif 152 153 /* Persistent data: */ 154 155 #ifdef IPCONFIG_DYNAMIC 156 static int ic_proto_used; /* Protocol used, if any */ 157 #else 158 #define ic_proto_used 0 159 #endif 160 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 161 static __be32 ic_ntp_servers[CONF_NTP_SERVERS_MAX]; /* NTP server IP addresses */ 162 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 163 164 /* 165 * Private state. 166 */ 167 168 /* Name of user-selected boot device */ 169 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 170 171 /* Protocols supported by available interfaces */ 172 static int ic_proto_have_if __initdata; 173 174 /* MTU for boot device */ 175 static int ic_dev_mtu __initdata; 176 177 #ifdef IPCONFIG_DYNAMIC 178 static DEFINE_SPINLOCK(ic_recv_lock); 179 static volatile int ic_got_reply __initdata; /* Proto(s) that replied */ 180 #endif 181 #ifdef IPCONFIG_DHCP 182 static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */ 183 #endif 184 185 186 /* 187 * Network devices 188 */ 189 190 struct ic_device { 191 struct ic_device *next; 192 struct net_device *dev; 193 unsigned short flags; 194 short able; 195 __be32 xid; 196 }; 197 198 static struct ic_device *ic_first_dev __initdata; /* List of open device */ 199 static struct ic_device *ic_dev __initdata; /* Selected device */ 200 201 static 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 } 210 211 static 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 } 292 have_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 } 307 308 static 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 */ 330 331 static inline void 332 set_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 */ 342 343 static 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 } 382 383 static 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 */ 413 414 static 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 453 454 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 455 456 static struct packet_type rarp_packet_type __initdata = { 457 .type = cpu_to_be16(ETH_P_RARP), 458 .func = ic_rarp_recv, 459 }; 460 461 static inline void __init ic_rarp_init(void) 462 { 463 dev_add_pack(&rarp_packet_type); 464 } 465 466 static inline void __init ic_rarp_cleanup(void) 467 { 468 dev_remove_pack(&rarp_packet_type); 469 } 470 471 /* 472 * Process received RARP packet. 473 */ 474 static int __init 475 ic_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; 554 555 drop_unlock: 556 /* Show's over. Nothing to see here. */ 557 spin_unlock(&ic_recv_lock); 558 559 drop: 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 */ 569 static 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 */ 580 static 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 */ 589 static 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 602 603 struct 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 8 636 637 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 638 639 static 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 */ 647 648 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 649 650 #ifdef IPCONFIG_DHCP 651 652 static void __init 653 ic_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 */ 732 733 static 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 */ 770 static 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 */ 787 static 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 */ 796 static 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 if not already set. 874 */ 875 static 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 */ 890 static 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 ic_bootp_string(utsname()->nodename, ext+1, *ext, 923 __NEW_UTS_LEN); 924 ic_host_name_set = 1; 925 break; 926 case 15: /* Domain name (DNS) */ 927 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 928 break; 929 case 17: /* Root path */ 930 if (!root_server_path[0]) 931 ic_bootp_string(root_server_path, ext+1, *ext, 932 sizeof(root_server_path)); 933 break; 934 case 26: /* Interface MTU */ 935 memcpy(&mtu, ext+1, sizeof(mtu)); 936 ic_dev_mtu = ntohs(mtu); 937 break; 938 case 40: /* NIS Domain name (_not_ DNS) */ 939 ic_bootp_string(utsname()->domainname, ext+1, *ext, 940 __NEW_UTS_LEN); 941 break; 942 case 42: /* NTP servers */ 943 servers = *ext / 4; 944 if (servers > CONF_NTP_SERVERS_MAX) 945 servers = CONF_NTP_SERVERS_MAX; 946 for (i = 0; i < servers; i++) { 947 if (ic_ntp_servers[i] == NONE) 948 memcpy(&ic_ntp_servers[i], ext+1+4*i, 4); 949 } 950 break; 951 } 952 } 953 954 955 /* 956 * Receive BOOTP reply. 957 */ 958 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 959 { 960 struct bootp_pkt *b; 961 struct iphdr *h; 962 struct ic_device *d; 963 int len, ext_len; 964 965 if (!net_eq(dev_net(dev), &init_net)) 966 goto drop; 967 968 /* Perform verifications before taking the lock. */ 969 if (skb->pkt_type == PACKET_OTHERHOST) 970 goto drop; 971 972 skb = skb_share_check(skb, GFP_ATOMIC); 973 if (!skb) 974 return NET_RX_DROP; 975 976 if (!pskb_may_pull(skb, 977 sizeof(struct iphdr) + 978 sizeof(struct udphdr))) 979 goto drop; 980 981 b = (struct bootp_pkt *)skb_network_header(skb); 982 h = &b->iph; 983 984 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 985 goto drop; 986 987 /* Fragments are not supported */ 988 if (ip_is_fragment(h)) { 989 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); 990 goto drop; 991 } 992 993 if (skb->len < ntohs(h->tot_len)) 994 goto drop; 995 996 if (ip_fast_csum((char *) h, h->ihl)) 997 goto drop; 998 999 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 1000 goto drop; 1001 1002 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 1003 goto drop; 1004 1005 len = ntohs(b->udph.len) - sizeof(struct udphdr); 1006 ext_len = len - (sizeof(*b) - 1007 sizeof(struct iphdr) - 1008 sizeof(struct udphdr) - 1009 sizeof(b->exten)); 1010 if (ext_len < 0) 1011 goto drop; 1012 1013 /* Ok the front looks good, make sure we can get at the rest. */ 1014 if (!pskb_may_pull(skb, skb->len)) 1015 goto drop; 1016 1017 b = (struct bootp_pkt *)skb_network_header(skb); 1018 h = &b->iph; 1019 1020 /* One reply at a time, please. */ 1021 spin_lock(&ic_recv_lock); 1022 1023 /* If we already have a reply, just drop the packet */ 1024 if (ic_got_reply) 1025 goto drop_unlock; 1026 1027 /* Find the ic_device that the packet arrived on */ 1028 d = ic_first_dev; 1029 while (d && d->dev != dev) 1030 d = d->next; 1031 if (!d) 1032 goto drop_unlock; /* should never happen */ 1033 1034 /* Is it a reply to our BOOTP request? */ 1035 if (b->op != BOOTP_REPLY || 1036 b->xid != d->xid) { 1037 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n", 1038 d->dev->name, b->op, b->xid); 1039 goto drop_unlock; 1040 } 1041 1042 /* Parse extensions */ 1043 if (ext_len >= 4 && 1044 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1045 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1046 u8 *ext; 1047 1048 #ifdef IPCONFIG_DHCP 1049 if (ic_proto_enabled & IC_USE_DHCP) { 1050 __be32 server_id = NONE; 1051 int mt = 0; 1052 1053 ext = &b->exten[4]; 1054 while (ext < end && *ext != 0xff) { 1055 u8 *opt = ext++; 1056 if (*opt == 0) /* Padding */ 1057 continue; 1058 ext += *ext + 1; 1059 if (ext >= end) 1060 break; 1061 switch (*opt) { 1062 case 53: /* Message type */ 1063 if (opt[1]) 1064 mt = opt[2]; 1065 break; 1066 case 54: /* Server ID (IP address) */ 1067 if (opt[1] >= 4) 1068 memcpy(&server_id, opt + 2, 4); 1069 break; 1070 } 1071 } 1072 1073 pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name); 1074 1075 switch (mt) { 1076 case DHCPOFFER: 1077 /* While in the process of accepting one offer, 1078 * ignore all others. 1079 */ 1080 if (ic_myaddr != NONE) 1081 goto drop_unlock; 1082 1083 /* Let's accept that offer. */ 1084 ic_myaddr = b->your_ip; 1085 ic_servaddr = server_id; 1086 pr_debug("DHCP: Offered address %pI4 by server %pI4\n", 1087 &ic_myaddr, &b->iph.saddr); 1088 /* The DHCP indicated server address takes 1089 * precedence over the bootp header one if 1090 * they are different. 1091 */ 1092 if ((server_id != NONE) && 1093 (b->server_ip != server_id)) 1094 b->server_ip = ic_servaddr; 1095 break; 1096 1097 case DHCPACK: 1098 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1099 goto drop_unlock; 1100 1101 /* Yeah! */ 1102 break; 1103 1104 default: 1105 /* Urque. Forget it*/ 1106 ic_myaddr = NONE; 1107 ic_servaddr = NONE; 1108 goto drop_unlock; 1109 } 1110 1111 ic_dhcp_msgtype = mt; 1112 1113 } 1114 #endif /* IPCONFIG_DHCP */ 1115 1116 ext = &b->exten[4]; 1117 while (ext < end && *ext != 0xff) { 1118 u8 *opt = ext++; 1119 if (*opt == 0) /* Padding */ 1120 continue; 1121 ext += *ext + 1; 1122 if (ext < end) 1123 ic_do_bootp_ext(opt); 1124 } 1125 } 1126 1127 /* We have a winner! */ 1128 ic_dev = d; 1129 ic_myaddr = b->your_ip; 1130 ic_servaddr = b->server_ip; 1131 ic_addrservaddr = b->iph.saddr; 1132 if (ic_gateway == NONE && b->relay_ip) 1133 ic_gateway = b->relay_ip; 1134 if (ic_nameservers[0] == NONE) 1135 ic_nameservers[0] = ic_servaddr; 1136 ic_got_reply = IC_BOOTP; 1137 1138 drop_unlock: 1139 /* Show's over. Nothing to see here. */ 1140 spin_unlock(&ic_recv_lock); 1141 1142 drop: 1143 /* Throw the packet out. */ 1144 kfree_skb(skb); 1145 1146 return 0; 1147 } 1148 1149 1150 #endif 1151 1152 1153 /* 1154 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1155 */ 1156 1157 #ifdef IPCONFIG_DYNAMIC 1158 1159 static int __init ic_dynamic(void) 1160 { 1161 int retries; 1162 struct ic_device *d; 1163 unsigned long start_jiffies, timeout, jiff; 1164 int do_bootp = ic_proto_have_if & IC_BOOTP; 1165 int do_rarp = ic_proto_have_if & IC_RARP; 1166 1167 /* 1168 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1169 * This routine gets only called when some pieces of information 1170 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1171 */ 1172 if (!ic_proto_enabled) { 1173 pr_err("IP-Config: Incomplete network configuration information\n"); 1174 return -1; 1175 } 1176 1177 #ifdef IPCONFIG_BOOTP 1178 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1179 pr_err("DHCP/BOOTP: No suitable device found\n"); 1180 #endif 1181 #ifdef IPCONFIG_RARP 1182 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1183 pr_err("RARP: No suitable device found\n"); 1184 #endif 1185 1186 if (!ic_proto_have_if) 1187 /* Error message already printed */ 1188 return -1; 1189 1190 /* 1191 * Setup protocols 1192 */ 1193 #ifdef IPCONFIG_BOOTP 1194 if (do_bootp) 1195 ic_bootp_init(); 1196 #endif 1197 #ifdef IPCONFIG_RARP 1198 if (do_rarp) 1199 ic_rarp_init(); 1200 #endif 1201 1202 /* 1203 * Send requests and wait, until we get an answer. This loop 1204 * seems to be a terrible waste of CPU time, but actually there is 1205 * only one process running at all, so we don't need to use any 1206 * scheduler functions. 1207 * [Actually we could now, but the nothing else running note still 1208 * applies.. - AC] 1209 */ 1210 pr_notice("Sending %s%s%s requests .", 1211 do_bootp 1212 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1213 (do_bootp && do_rarp) ? " and " : "", 1214 do_rarp ? "RARP" : ""); 1215 1216 start_jiffies = jiffies; 1217 d = ic_first_dev; 1218 retries = CONF_SEND_RETRIES; 1219 get_random_bytes(&timeout, sizeof(timeout)); 1220 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); 1221 for (;;) { 1222 #ifdef IPCONFIG_BOOTP 1223 if (do_bootp && (d->able & IC_BOOTP)) 1224 ic_bootp_send_if(d, jiffies - start_jiffies); 1225 #endif 1226 #ifdef IPCONFIG_RARP 1227 if (do_rarp && (d->able & IC_RARP)) 1228 ic_rarp_send_if(d); 1229 #endif 1230 1231 if (!d->next) { 1232 jiff = jiffies + timeout; 1233 while (time_before(jiffies, jiff) && !ic_got_reply) 1234 schedule_timeout_uninterruptible(1); 1235 } 1236 #ifdef IPCONFIG_DHCP 1237 /* DHCP isn't done until we get a DHCPACK. */ 1238 if ((ic_got_reply & IC_BOOTP) && 1239 (ic_proto_enabled & IC_USE_DHCP) && 1240 ic_dhcp_msgtype != DHCPACK) { 1241 ic_got_reply = 0; 1242 /* continue on device that got the reply */ 1243 d = ic_dev; 1244 pr_cont(","); 1245 continue; 1246 } 1247 #endif /* IPCONFIG_DHCP */ 1248 1249 if (ic_got_reply) { 1250 pr_cont(" OK\n"); 1251 break; 1252 } 1253 1254 if ((d = d->next)) 1255 continue; 1256 1257 if (! --retries) { 1258 pr_cont(" timed out!\n"); 1259 break; 1260 } 1261 1262 d = ic_first_dev; 1263 1264 timeout = timeout CONF_TIMEOUT_MULT; 1265 if (timeout > CONF_TIMEOUT_MAX) 1266 timeout = CONF_TIMEOUT_MAX; 1267 1268 pr_cont("."); 1269 } 1270 1271 #ifdef IPCONFIG_BOOTP 1272 if (do_bootp) 1273 ic_bootp_cleanup(); 1274 #endif 1275 #ifdef IPCONFIG_RARP 1276 if (do_rarp) 1277 ic_rarp_cleanup(); 1278 #endif 1279 1280 if (!ic_got_reply) { 1281 ic_myaddr = NONE; 1282 return -1; 1283 } 1284 1285 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n", 1286 ((ic_got_reply & IC_RARP) ? "RARP" 1287 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1288 &ic_addrservaddr, &ic_myaddr); 1289 1290 return 0; 1291 } 1292 1293 #endif /* IPCONFIG_DYNAMIC */ 1294 1295 #ifdef CONFIG_PROC_FS 1296 /* proc_dir_entry for /proc/net/ipconfig */ 1297 static struct proc_dir_entry *ipconfig_dir; 1298 1299 /* Name servers: */ 1300 static int pnp_seq_show(struct seq_file *seq, void *v) 1301 { 1302 int i; 1303 1304 if (ic_proto_used & IC_PROTO) 1305 seq_printf(seq, "#PROTO: %s\n", 1306 (ic_proto_used & IC_RARP) ? "RARP" 1307 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1308 else 1309 seq_puts(seq, "#MANUAL\n"); 1310 1311 if (ic_domain[0]) 1312 seq_printf(seq, 1313 "domain %s\n", ic_domain); 1314 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1315 if (ic_nameservers[i] != NONE) 1316 seq_printf(seq, "nameserver %pI4\n", 1317 &ic_nameservers[i]); 1318 } 1319 if (ic_servaddr != NONE) 1320 seq_printf(seq, "bootserver %pI4\n", 1321 &ic_servaddr); 1322 return 0; 1323 } 1324 1325 /* Create the /proc/net/ipconfig directory */ 1326 static int __init ipconfig_proc_net_init(void) 1327 { 1328 ipconfig_dir = proc_net_mkdir(&init_net, "ipconfig", init_net.proc_net); 1329 if (!ipconfig_dir) 1330 return -ENOMEM; 1331 1332 return 0; 1333 } 1334 1335 /* Create a new file under /proc/net/ipconfig */ 1336 static int ipconfig_proc_net_create(const char *name, 1337 const struct proc_ops *proc_ops) 1338 { 1339 char *pname; 1340 struct proc_dir_entry *p; 1341 1342 if (!ipconfig_dir) 1343 return -ENOMEM; 1344 1345 pname = kasprintf(GFP_KERNEL, "%s%s", "ipconfig/", name); 1346 if (!pname) 1347 return -ENOMEM; 1348 1349 p = proc_create(pname, 0444, init_net.proc_net, proc_ops); 1350 kfree(pname); 1351 if (!p) 1352 return -ENOMEM; 1353 1354 return 0; 1355 } 1356 1357 /* Write NTP server IP addresses to /proc/net/ipconfig/ntp_servers */ 1358 static int ntp_servers_show(struct seq_file *seq, void *v) 1359 { 1360 int i; 1361 1362 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) { 1363 if (ic_ntp_servers[i] != NONE) 1364 seq_printf(seq, "%pI4\n", &ic_ntp_servers[i]); 1365 } 1366 return 0; 1367 } 1368 DEFINE_PROC_SHOW_ATTRIBUTE(ntp_servers); 1369 #endif /* CONFIG_PROC_FS */ 1370 1371 /* 1372 * Extract IP address from the parameter string if needed. Note that we 1373 * need to have root_server_addr set _before_ IPConfig gets called as it 1374 * can override it. 1375 */ 1376 __be32 __init root_nfs_parse_addr(char *name) 1377 { 1378 __be32 addr; 1379 int octets = 0; 1380 char *cp, *cq; 1381 1382 cp = cq = name; 1383 while (octets < 4) { 1384 while (*cp >= '0' && *cp <= '9') 1385 cp++; 1386 if (cp == cq || cp - cq > 3) 1387 break; 1388 if (*cp == '.' || octets == 3) 1389 octets++; 1390 if (octets < 4) 1391 cp++; 1392 cq = cp; 1393 } 1394 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1395 if (*cp == ':') 1396 *cp++ = '\0'; 1397 addr = in_aton(name); 1398 memmove(name, cp, strlen(cp) + 1); 1399 } else 1400 addr = NONE; 1401 1402 return addr; 1403 } 1404 1405 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1406 1407 static int __init wait_for_devices(void) 1408 { 1409 int i; 1410 1411 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1412 struct net_device *dev; 1413 int found = 0; 1414 1415 /* make sure deferred device probes are finished */ 1416 wait_for_device_probe(); 1417 1418 rtnl_lock(); 1419 for_each_netdev(&init_net, dev) { 1420 if (ic_is_init_dev(dev)) { 1421 found = 1; 1422 break; 1423 } 1424 } 1425 rtnl_unlock(); 1426 if (found) 1427 return 0; 1428 ssleep(1); 1429 } 1430 return -ENODEV; 1431 } 1432 1433 /* 1434 * IP Autoconfig dispatcher. 1435 */ 1436 1437 static int __init ip_auto_config(void) 1438 { 1439 __be32 addr; 1440 #ifdef IPCONFIG_DYNAMIC 1441 int retries = CONF_OPEN_RETRIES; 1442 #endif 1443 int err; 1444 unsigned int i; 1445 1446 /* Initialise all name servers and NTP servers to NONE (but only if the 1447 * "ip=" or "nfsaddrs=" kernel command line parameters weren't decoded, 1448 * otherwise we'll overwrite the IP addresses specified there) 1449 */ 1450 if (ic_set_manually == 0) { 1451 ic_nameservers_predef(); 1452 ic_ntp_servers_predef(); 1453 } 1454 1455 #ifdef CONFIG_PROC_FS 1456 proc_create_single("pnp", 0444, init_net.proc_net, pnp_seq_show); 1457 1458 if (ipconfig_proc_net_init() == 0) 1459 ipconfig_proc_net_create("ntp_servers", &ntp_servers_proc_ops); 1460 #endif /* CONFIG_PROC_FS */ 1461 1462 if (!ic_enable) 1463 return 0; 1464 1465 pr_debug("IP-Config: Entered.\n"); 1466 #ifdef IPCONFIG_DYNAMIC 1467 try_try_again: 1468 #endif 1469 /* Wait for devices to appear */ 1470 err = wait_for_devices(); 1471 if (err) 1472 return err; 1473 1474 /* Setup all network devices */ 1475 err = ic_open_devs(); 1476 if (err) 1477 return err; 1478 1479 /* Give drivers a chance to settle */ 1480 msleep(CONF_POST_OPEN); 1481 1482 /* 1483 * If the config information is insufficient (e.g., our IP address or 1484 * IP address of the boot server is missing or we have multiple network 1485 * interfaces and no default was set), use BOOTP or RARP to get the 1486 * missing values. 1487 */ 1488 if (ic_myaddr == NONE || 1489 #if defined(CONFIG_ROOT_NFS) || defined(CONFIG_CIFS_ROOT) 1490 (root_server_addr == NONE && 1491 ic_servaddr == NONE && 1492 (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) || 1493 #endif 1494 ic_first_dev->next) { 1495 #ifdef IPCONFIG_DYNAMIC 1496 if (ic_dynamic() < 0) { 1497 ic_close_devs(); 1498 1499 /* 1500 * I don't know why, but sometimes the 1501 * eepro100 driver (at least) gets upset and 1502 * doesn't work the first time it's opened. 1503 * But then if you close it and reopen it, it 1504 * works just fine. So we need to try that at 1505 * least once before giving up. 1506 * 1507 * Also, if the root will be NFS-mounted, we 1508 * have nowhere to go if DHCP fails. So we 1509 * just have to keep trying forever. 1510 * 1511 * -- Chip 1512 */ 1513 #ifdef CONFIG_ROOT_NFS 1514 if (ROOT_DEV == Root_NFS) { 1515 pr_err("IP-Config: Retrying forever (NFS root)...\n"); 1516 goto try_try_again; 1517 } 1518 #endif 1519 #ifdef CONFIG_CIFS_ROOT 1520 if (ROOT_DEV == Root_CIFS) { 1521 pr_err("IP-Config: Retrying forever (CIFS root)...\n"); 1522 goto try_try_again; 1523 } 1524 #endif 1525 1526 if (--retries) { 1527 pr_err("IP-Config: Reopening network devices...\n"); 1528 goto try_try_again; 1529 } 1530 1531 /* Oh, well. At least we tried. */ 1532 pr_err("IP-Config: Auto-configuration of network failed\n"); 1533 return -1; 1534 } 1535 #else /* !DYNAMIC */ 1536 pr_err("IP-Config: Incomplete network configuration information\n"); 1537 ic_close_devs(); 1538 return -1; 1539 #endif /* IPCONFIG_DYNAMIC */ 1540 } else { 1541 /* Device selected manually or only one device -> use it */ 1542 ic_dev = ic_first_dev; 1543 } 1544 1545 addr = root_nfs_parse_addr(root_server_path); 1546 if (root_server_addr == NONE) 1547 root_server_addr = addr; 1548 1549 /* 1550 * Use defaults wherever applicable. 1551 */ 1552 if (ic_defaults() < 0) 1553 return -1; 1554 1555 /* 1556 * Record which protocol was actually used. 1557 */ 1558 #ifdef IPCONFIG_DYNAMIC 1559 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1560 #endif 1561 1562 #ifndef IPCONFIG_SILENT 1563 /* 1564 * Clue in the operator. 1565 */ 1566 pr_info("IP-Config: Complete:\n"); 1567 1568 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", 1569 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr, 1570 &ic_myaddr, &ic_netmask, &ic_gateway); 1571 pr_info(" host=%s, domain=%s, nis-domain=%s\n", 1572 utsname()->nodename, ic_domain, utsname()->domainname); 1573 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", 1574 &ic_servaddr, &root_server_addr, root_server_path); 1575 if (ic_dev_mtu) 1576 pr_cont(", mtu=%d", ic_dev_mtu); 1577 /* Name servers (if any): */ 1578 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1579 if (ic_nameservers[i] != NONE) { 1580 if (i == 0) 1581 pr_info(" nameserver%u=%pI4", 1582 i, &ic_nameservers[i]); 1583 else 1584 pr_cont(", nameserver%u=%pI4", 1585 i, &ic_nameservers[i]); 1586 } 1587 if (i + 1 == CONF_NAMESERVERS_MAX) 1588 pr_cont("\n"); 1589 } 1590 /* NTP servers (if any): */ 1591 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) { 1592 if (ic_ntp_servers[i] != NONE) { 1593 if (i == 0) 1594 pr_info(" ntpserver%u=%pI4", 1595 i, &ic_ntp_servers[i]); 1596 else 1597 pr_cont(", ntpserver%u=%pI4", 1598 i, &ic_ntp_servers[i]); 1599 } 1600 if (i + 1 == CONF_NTP_SERVERS_MAX) 1601 pr_cont("\n"); 1602 } 1603 #endif /* !SILENT */ 1604 1605 /* 1606 * Close all network devices except the device we've 1607 * autoconfigured and set up routes. 1608 */ 1609 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1610 err = -1; 1611 else 1612 err = 0; 1613 1614 ic_close_devs(); 1615 1616 return err; 1617 } 1618 1619 late_initcall(ip_auto_config); 1620 1621 1622 /* 1623 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1624 * command line parameter. See Documentation/admin-guide/nfs/nfsroot.rst. 1625 */ 1626 static int __init ic_proto_name(char *name) 1627 { 1628 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1629 return 1; 1630 } 1631 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1632 return 0; 1633 } 1634 #ifdef CONFIG_IP_PNP_DHCP 1635 else if (!strncmp(name, "dhcp", 4)) { 1636 char *client_id; 1637 1638 ic_proto_enabled &= ~IC_RARP; 1639 client_id = strstr(name, "dhcp,"); 1640 if (client_id) { 1641 char *v; 1642 1643 client_id = client_id + 5; 1644 v = strchr(client_id, ','); 1645 if (!v) 1646 return 1; 1647 *v = 0; 1648 if (kstrtou8(client_id, 0, dhcp_client_identifier)) 1649 pr_debug("DHCP: Invalid client identifier type\n"); 1650 strncpy(dhcp_client_identifier + 1, v + 1, 251); 1651 *v = ','; 1652 } 1653 return 1; 1654 } 1655 #endif 1656 #ifdef CONFIG_IP_PNP_BOOTP 1657 else if (!strcmp(name, "bootp")) { 1658 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1659 return 1; 1660 } 1661 #endif 1662 #ifdef CONFIG_IP_PNP_RARP 1663 else if (!strcmp(name, "rarp")) { 1664 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1665 return 1; 1666 } 1667 #endif 1668 #ifdef IPCONFIG_DYNAMIC 1669 else if (!strcmp(name, "both")) { 1670 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1671 return 1; 1672 } 1673 #endif 1674 return 0; 1675 } 1676 1677 static int __init ip_auto_config_setup(char *addrs) 1678 { 1679 char *cp, *ip, *dp; 1680 int num = 0; 1681 1682 ic_set_manually = 1; 1683 ic_enable = 1; 1684 1685 /* 1686 * If any dhcp, bootp etc options are set, leave autoconfig on 1687 * and skip the below static IP processing. 1688 */ 1689 if (ic_proto_name(addrs)) 1690 return 1; 1691 1692 /* If no static IP is given, turn off autoconfig and bail. */ 1693 if (*addrs == 0 || 1694 strcmp(addrs, "off") == 0 || 1695 strcmp(addrs, "none") == 0) { 1696 ic_enable = 0; 1697 return 1; 1698 } 1699 1700 /* Initialise all name servers and NTP servers to NONE */ 1701 ic_nameservers_predef(); 1702 ic_ntp_servers_predef(); 1703 1704 /* Parse string for static IP assignment. */ 1705 ip = addrs; 1706 while (ip && *ip) { 1707 if ((cp = strchr(ip, ':'))) 1708 *cp++ = '\0'; 1709 if (strlen(ip) > 0) { 1710 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip); 1711 switch (num) { 1712 case 0: 1713 if ((ic_myaddr = in_aton(ip)) == ANY) 1714 ic_myaddr = NONE; 1715 break; 1716 case 1: 1717 if ((ic_servaddr = in_aton(ip)) == ANY) 1718 ic_servaddr = NONE; 1719 break; 1720 case 2: 1721 if ((ic_gateway = in_aton(ip)) == ANY) 1722 ic_gateway = NONE; 1723 break; 1724 case 3: 1725 if ((ic_netmask = in_aton(ip)) == ANY) 1726 ic_netmask = NONE; 1727 break; 1728 case 4: 1729 if ((dp = strchr(ip, '.'))) { 1730 *dp++ = '\0'; 1731 strlcpy(utsname()->domainname, dp, 1732 sizeof(utsname()->domainname)); 1733 } 1734 strlcpy(utsname()->nodename, ip, 1735 sizeof(utsname()->nodename)); 1736 ic_host_name_set = 1; 1737 break; 1738 case 5: 1739 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1740 break; 1741 case 6: 1742 if (ic_proto_name(ip) == 0 && 1743 ic_myaddr == NONE) { 1744 ic_enable = 0; 1745 } 1746 break; 1747 case 7: 1748 if (CONF_NAMESERVERS_MAX >= 1) { 1749 ic_nameservers[0] = in_aton(ip); 1750 if (ic_nameservers[0] == ANY) 1751 ic_nameservers[0] = NONE; 1752 } 1753 break; 1754 case 8: 1755 if (CONF_NAMESERVERS_MAX >= 2) { 1756 ic_nameservers[1] = in_aton(ip); 1757 if (ic_nameservers[1] == ANY) 1758 ic_nameservers[1] = NONE; 1759 } 1760 break; 1761 case 9: 1762 if (CONF_NTP_SERVERS_MAX >= 1) { 1763 ic_ntp_servers[0] = in_aton(ip); 1764 if (ic_ntp_servers[0] == ANY) 1765 ic_ntp_servers[0] = NONE; 1766 } 1767 break; 1768 } 1769 } 1770 ip = cp; 1771 num++; 1772 } 1773 1774 return 1; 1775 } 1776 __setup("ip=", ip_auto_config_setup); 1777 1778 static int __init nfsaddrs_config_setup(char *addrs) 1779 { 1780 return ip_auto_config_setup(addrs); 1781 } 1782 __setup("nfsaddrs=", nfsaddrs_config_setup); 1783 1784 static int __init vendor_class_identifier_setup(char *addrs) 1785 { 1786 if (strlcpy(vendor_class_identifier, addrs, 1787 sizeof(vendor_class_identifier)) 1788 >= sizeof(vendor_class_identifier)) 1789 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n", 1790 vendor_class_identifier); 1791 return 1; 1792 } 1793 __setup("dhcpclass=", vendor_class_identifier_setup); 1794 1795 static int __init set_carrier_timeout(char *str) 1796 { 1797 ssize_t ret; 1798 1799 if (!str) 1800 return 0; 1801 1802 ret = kstrtouint(str, 0, &carrier_timeout); 1803 if (ret) 1804 return 0; 1805 1806 return 1; 1807 } 1808 __setup("carrier_timeout=", set_carrier_timeout); 1809