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 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */ 89 90 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ 91 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ 92 #define CONF_SEND_RETRIES 6 /* Send six requests per open */ 93 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ 94 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ 95 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ 96 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ 97 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers 98 - '3' from resolv.h */ 99 #define CONF_NTP_SERVERS_MAX 3 /* Maximum number of NTP servers */ 100 101 #define NONE cpu_to_be32(INADDR_NONE) 102 #define ANY cpu_to_be32(INADDR_ANY) 103 104 /* 105 * Public IP configuration 106 */ 107 108 /* This is used by platforms which might be able to set the ipconfig 109 * variables using firmware environment vars. If this is set, it will 110 * ignore such firmware variables. 111 */ 112 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ 113 114 static int ic_enable __initdata; /* IP config enabled? */ 115 116 /* Protocol choice */ 117 int ic_proto_enabled __initdata = 0 118 #ifdef IPCONFIG_BOOTP 119 | IC_BOOTP 120 #endif 121 #ifdef CONFIG_IP_PNP_DHCP 122 | IC_USE_DHCP 123 #endif 124 #ifdef IPCONFIG_RARP 125 | IC_RARP 126 #endif 127 ; 128 129 static int ic_host_name_set __initdata; /* Host name set by us? */ 130 131 __be32 ic_myaddr = NONE; /* My IP address */ 132 static __be32 ic_netmask = NONE; /* Netmask for local subnet */ 133 __be32 ic_gateway = NONE; /* Gateway IP address */ 134 135 #ifdef IPCONFIG_DYNAMIC 136 static __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */ 137 #endif 138 139 __be32 ic_servaddr = NONE; /* Boot server IP address */ 140 141 __be32 root_server_addr = NONE; /* Address of NFS server */ 142 u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 143 144 /* vendor class identifier */ 145 static char vendor_class_identifier[253] __initdata; 146 147 #if defined(CONFIG_IP_PNP_DHCP) 148 static char dhcp_client_identifier[253] __initdata; 149 #endif 150 151 /* Persistent data: */ 152 153 #ifdef IPCONFIG_DYNAMIC 154 static int ic_proto_used; /* Protocol used, if any */ 155 #else 156 #define ic_proto_used 0 157 #endif 158 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 159 static __be32 ic_ntp_servers[CONF_NTP_SERVERS_MAX]; /* NTP server IP addresses */ 160 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 161 162 /* 163 * Private state. 164 */ 165 166 /* Name of user-selected boot device */ 167 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 168 169 /* Protocols supported by available interfaces */ 170 static int ic_proto_have_if __initdata; 171 172 /* MTU for boot device */ 173 static int ic_dev_mtu __initdata; 174 175 #ifdef IPCONFIG_DYNAMIC 176 static DEFINE_SPINLOCK(ic_recv_lock); 177 static volatile int ic_got_reply __initdata; /* Proto(s) that replied */ 178 #endif 179 #ifdef IPCONFIG_DHCP 180 static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */ 181 #endif 182 183 184 /* 185 * Network devices 186 */ 187 188 struct ic_device { 189 struct ic_device *next; 190 struct net_device *dev; 191 unsigned short flags; 192 short able; 193 __be32 xid; 194 }; 195 196 static struct ic_device *ic_first_dev __initdata; /* List of open device */ 197 static struct ic_device *ic_dev __initdata; /* Selected device */ 198 199 static bool __init ic_is_init_dev(struct net_device *dev) 200 { 201 if (dev->flags & IFF_LOOPBACK) 202 return false; 203 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 204 (!(dev->flags & IFF_LOOPBACK) && 205 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 206 strncmp(dev->name, "dummy", 5)); 207 } 208 209 static int __init ic_open_devs(void) 210 { 211 struct ic_device *d, **last; 212 struct net_device *dev; 213 unsigned short oflags; 214 unsigned long start, next_msg; 215 216 last = &ic_first_dev; 217 rtnl_lock(); 218 219 /* bring loopback and DSA master network devices up first */ 220 for_each_netdev(&init_net, dev) { 221 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev)) 222 continue; 223 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) 224 pr_err("IP-Config: Failed to open %s\n", dev->name); 225 } 226 227 for_each_netdev(&init_net, dev) { 228 if (ic_is_init_dev(dev)) { 229 int able = 0; 230 if (dev->mtu >= 364) 231 able |= IC_BOOTP; 232 else 233 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n", 234 dev->name, dev->mtu); 235 if (!(dev->flags & IFF_NOARP)) 236 able |= IC_RARP; 237 able &= ic_proto_enabled; 238 if (ic_proto_enabled && !able) 239 continue; 240 oflags = dev->flags; 241 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 242 pr_err("IP-Config: Failed to open %s\n", 243 dev->name); 244 continue; 245 } 246 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 247 rtnl_unlock(); 248 return -ENOMEM; 249 } 250 d->dev = dev; 251 *last = d; 252 last = &d->next; 253 d->flags = oflags; 254 d->able = able; 255 if (able & IC_BOOTP) 256 get_random_bytes(&d->xid, sizeof(__be32)); 257 else 258 d->xid = 0; 259 ic_proto_have_if |= able; 260 pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n", 261 dev->name, able, d->xid); 262 } 263 } 264 265 /* no point in waiting if we could not bring up at least one device */ 266 if (!ic_first_dev) 267 goto have_carrier; 268 269 /* wait for a carrier on at least one device */ 270 start = jiffies; 271 next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12); 272 while (time_before(jiffies, start + 273 msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) { 274 int wait, elapsed; 275 276 for_each_netdev(&init_net, dev) 277 if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) 278 goto have_carrier; 279 280 msleep(1); 281 282 if (time_before(jiffies, next_msg)) 283 continue; 284 285 elapsed = jiffies_to_msecs(jiffies - start); 286 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000; 287 pr_info("Waiting up to %d more seconds for network.\n", wait); 288 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12); 289 } 290 have_carrier: 291 rtnl_unlock(); 292 293 *last = NULL; 294 295 if (!ic_first_dev) { 296 if (user_dev_name[0]) 297 pr_err("IP-Config: Device `%s' not found\n", 298 user_dev_name); 299 else 300 pr_err("IP-Config: No network devices available\n"); 301 return -ENODEV; 302 } 303 return 0; 304 } 305 306 static void __init ic_close_devs(void) 307 { 308 struct ic_device *d, *next; 309 struct net_device *dev; 310 311 rtnl_lock(); 312 next = ic_first_dev; 313 while ((d = next)) { 314 next = d->next; 315 dev = d->dev; 316 if (d != ic_dev && !netdev_uses_dsa(dev)) { 317 pr_debug("IP-Config: Downing %s\n", dev->name); 318 dev_change_flags(dev, d->flags); 319 } 320 kfree(d); 321 } 322 rtnl_unlock(); 323 } 324 325 /* 326 * Interface to various network functions. 327 */ 328 329 static inline void 330 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 331 { 332 sin->sin_family = AF_INET; 333 sin->sin_addr.s_addr = addr; 334 sin->sin_port = port; 335 } 336 337 /* 338 * Set up interface addresses and routes. 339 */ 340 341 static int __init ic_setup_if(void) 342 { 343 struct ifreq ir; 344 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 345 int err; 346 347 memset(&ir, 0, sizeof(ir)); 348 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name); 349 set_sockaddr(sin, ic_myaddr, 0); 350 if ((err = devinet_ioctl(&init_net, SIOCSIFADDR, &ir)) < 0) { 351 pr_err("IP-Config: Unable to set interface address (%d)\n", 352 err); 353 return -1; 354 } 355 set_sockaddr(sin, ic_netmask, 0); 356 if ((err = devinet_ioctl(&init_net, SIOCSIFNETMASK, &ir)) < 0) { 357 pr_err("IP-Config: Unable to set interface netmask (%d)\n", 358 err); 359 return -1; 360 } 361 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 362 if ((err = devinet_ioctl(&init_net, SIOCSIFBRDADDR, &ir)) < 0) { 363 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n", 364 err); 365 return -1; 366 } 367 /* Handle the case where we need non-standard MTU on the boot link (a network 368 * using jumbo frames, for instance). If we can't set the mtu, don't error 369 * out, we'll try to muddle along. 370 */ 371 if (ic_dev_mtu != 0) { 372 rtnl_lock(); 373 if ((err = dev_set_mtu(ic_dev->dev, ic_dev_mtu)) < 0) 374 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", 375 ic_dev_mtu, err); 376 rtnl_unlock(); 377 } 378 return 0; 379 } 380 381 static int __init ic_setup_routes(void) 382 { 383 /* No need to setup device routes, only the default route... */ 384 385 if (ic_gateway != NONE) { 386 struct rtentry rm; 387 int err; 388 389 memset(&rm, 0, sizeof(rm)); 390 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 391 pr_err("IP-Config: Gateway not on directly connected network\n"); 392 return -1; 393 } 394 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 395 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 396 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 397 rm.rt_flags = RTF_UP | RTF_GATEWAY; 398 if ((err = ip_rt_ioctl(&init_net, SIOCADDRT, &rm)) < 0) { 399 pr_err("IP-Config: Cannot add default route (%d)\n", 400 err); 401 return -1; 402 } 403 } 404 405 return 0; 406 } 407 408 /* 409 * Fill in default values for all missing parameters. 410 */ 411 412 static int __init ic_defaults(void) 413 { 414 /* 415 * At this point we have no userspace running so need not 416 * claim locks on system_utsname 417 */ 418 419 if (!ic_host_name_set) 420 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 421 422 if (root_server_addr == NONE) 423 root_server_addr = ic_servaddr; 424 425 if (ic_netmask == NONE) { 426 if (IN_CLASSA(ntohl(ic_myaddr))) 427 ic_netmask = htonl(IN_CLASSA_NET); 428 else if (IN_CLASSB(ntohl(ic_myaddr))) 429 ic_netmask = htonl(IN_CLASSB_NET); 430 else if (IN_CLASSC(ntohl(ic_myaddr))) 431 ic_netmask = htonl(IN_CLASSC_NET); 432 else { 433 pr_err("IP-Config: Unable to guess netmask for address %pI4\n", 434 &ic_myaddr); 435 return -1; 436 } 437 pr_notice("IP-Config: Guessing netmask %pI4\n", 438 &ic_netmask); 439 } 440 441 return 0; 442 } 443 444 /* 445 * RARP support. 446 */ 447 448 #ifdef IPCONFIG_RARP 449 450 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 451 452 static struct packet_type rarp_packet_type __initdata = { 453 .type = cpu_to_be16(ETH_P_RARP), 454 .func = ic_rarp_recv, 455 }; 456 457 static inline void __init ic_rarp_init(void) 458 { 459 dev_add_pack(&rarp_packet_type); 460 } 461 462 static inline void __init ic_rarp_cleanup(void) 463 { 464 dev_remove_pack(&rarp_packet_type); 465 } 466 467 /* 468 * Process received RARP packet. 469 */ 470 static int __init 471 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 472 { 473 struct arphdr *rarp; 474 unsigned char *rarp_ptr; 475 __be32 sip, tip; 476 unsigned char *tha; /* t for "target" */ 477 struct ic_device *d; 478 479 if (!net_eq(dev_net(dev), &init_net)) 480 goto drop; 481 482 skb = skb_share_check(skb, GFP_ATOMIC); 483 if (!skb) 484 return NET_RX_DROP; 485 486 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 487 goto drop; 488 489 /* Basic sanity checks can be done without the lock. */ 490 rarp = (struct arphdr *)skb_transport_header(skb); 491 492 /* If this test doesn't pass, it's not IP, or we should 493 * ignore it anyway. 494 */ 495 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 496 goto drop; 497 498 /* If it's not a RARP reply, delete it. */ 499 if (rarp->ar_op != htons(ARPOP_RREPLY)) 500 goto drop; 501 502 /* If it's not Ethernet, delete it. */ 503 if (rarp->ar_pro != htons(ETH_P_IP)) 504 goto drop; 505 506 if (!pskb_may_pull(skb, arp_hdr_len(dev))) 507 goto drop; 508 509 /* OK, it is all there and looks valid, process... */ 510 rarp = (struct arphdr *)skb_transport_header(skb); 511 rarp_ptr = (unsigned char *) (rarp + 1); 512 513 /* One reply at a time, please. */ 514 spin_lock(&ic_recv_lock); 515 516 /* If we already have a reply, just drop the packet */ 517 if (ic_got_reply) 518 goto drop_unlock; 519 520 /* Find the ic_device that the packet arrived on */ 521 d = ic_first_dev; 522 while (d && d->dev != dev) 523 d = d->next; 524 if (!d) 525 goto drop_unlock; /* should never happen */ 526 527 /* Extract variable-width fields */ 528 rarp_ptr += dev->addr_len; 529 memcpy(&sip, rarp_ptr, 4); 530 rarp_ptr += 4; 531 tha = rarp_ptr; 532 rarp_ptr += dev->addr_len; 533 memcpy(&tip, rarp_ptr, 4); 534 535 /* Discard packets which are not meant for us. */ 536 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 537 goto drop_unlock; 538 539 /* Discard packets which are not from specified server. */ 540 if (ic_servaddr != NONE && ic_servaddr != sip) 541 goto drop_unlock; 542 543 /* We have a winner! */ 544 ic_dev = d; 545 if (ic_myaddr == NONE) 546 ic_myaddr = tip; 547 ic_servaddr = sip; 548 ic_addrservaddr = sip; 549 ic_got_reply = IC_RARP; 550 551 drop_unlock: 552 /* Show's over. Nothing to see here. */ 553 spin_unlock(&ic_recv_lock); 554 555 drop: 556 /* Throw the packet out. */ 557 kfree_skb(skb); 558 return 0; 559 } 560 561 562 /* 563 * Send RARP request packet over a single interface. 564 */ 565 static void __init ic_rarp_send_if(struct ic_device *d) 566 { 567 struct net_device *dev = d->dev; 568 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 569 dev->dev_addr, dev->dev_addr); 570 } 571 #endif 572 573 /* 574 * Predefine Nameservers 575 */ 576 static inline void __init ic_nameservers_predef(void) 577 { 578 int i; 579 580 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 581 ic_nameservers[i] = NONE; 582 } 583 584 /* Predefine NTP servers */ 585 static inline void __init ic_ntp_servers_predef(void) 586 { 587 int i; 588 589 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) 590 ic_ntp_servers[i] = NONE; 591 } 592 593 /* 594 * DHCP/BOOTP support. 595 */ 596 597 #ifdef IPCONFIG_BOOTP 598 599 struct bootp_pkt { /* BOOTP packet format */ 600 struct iphdr iph; /* IP header */ 601 struct udphdr udph; /* UDP header */ 602 u8 op; /* 1=request, 2=reply */ 603 u8 htype; /* HW address type */ 604 u8 hlen; /* HW address length */ 605 u8 hops; /* Used only by gateways */ 606 __be32 xid; /* Transaction ID */ 607 __be16 secs; /* Seconds since we started */ 608 __be16 flags; /* Just what it says */ 609 __be32 client_ip; /* Client's IP address if known */ 610 __be32 your_ip; /* Assigned IP address */ 611 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 612 __be32 relay_ip; /* IP address of BOOTP relay */ 613 u8 hw_addr[16]; /* Client's HW address */ 614 u8 serv_name[64]; /* Server host name */ 615 u8 boot_file[128]; /* Name of boot file */ 616 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 617 }; 618 619 /* packet ops */ 620 #define BOOTP_REQUEST 1 621 #define BOOTP_REPLY 2 622 623 /* DHCP message types */ 624 #define DHCPDISCOVER 1 625 #define DHCPOFFER 2 626 #define DHCPREQUEST 3 627 #define DHCPDECLINE 4 628 #define DHCPACK 5 629 #define DHCPNAK 6 630 #define DHCPRELEASE 7 631 #define DHCPINFORM 8 632 633 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 634 635 static struct packet_type bootp_packet_type __initdata = { 636 .type = cpu_to_be16(ETH_P_IP), 637 .func = ic_bootp_recv, 638 }; 639 640 /* 641 * Initialize DHCP/BOOTP extension fields in the request. 642 */ 643 644 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 645 646 #ifdef IPCONFIG_DHCP 647 648 static void __init 649 ic_dhcp_init_options(u8 *options, struct ic_device *d) 650 { 651 u8 mt = ((ic_servaddr == NONE) 652 ? DHCPDISCOVER : DHCPREQUEST); 653 u8 *e = options; 654 int len; 655 656 pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name); 657 658 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 659 e += 4; 660 661 *e++ = 53; /* DHCP message type */ 662 *e++ = 1; 663 *e++ = mt; 664 665 if (mt == DHCPREQUEST) { 666 *e++ = 54; /* Server ID (IP address) */ 667 *e++ = 4; 668 memcpy(e, &ic_servaddr, 4); 669 e += 4; 670 671 *e++ = 50; /* Requested IP address */ 672 *e++ = 4; 673 memcpy(e, &ic_myaddr, 4); 674 e += 4; 675 } 676 677 /* always? */ 678 { 679 static const u8 ic_req_params[] = { 680 1, /* Subnet mask */ 681 3, /* Default gateway */ 682 6, /* DNS server */ 683 12, /* Host name */ 684 15, /* Domain name */ 685 17, /* Boot path */ 686 26, /* MTU */ 687 40, /* NIS domain name */ 688 42, /* NTP servers */ 689 }; 690 691 *e++ = 55; /* Parameter request list */ 692 *e++ = sizeof(ic_req_params); 693 memcpy(e, ic_req_params, sizeof(ic_req_params)); 694 e += sizeof(ic_req_params); 695 696 if (ic_host_name_set) { 697 *e++ = 12; /* host-name */ 698 len = strlen(utsname()->nodename); 699 *e++ = len; 700 memcpy(e, utsname()->nodename, len); 701 e += len; 702 } 703 if (*vendor_class_identifier) { 704 pr_info("DHCP: sending class identifier \"%s\"\n", 705 vendor_class_identifier); 706 *e++ = 60; /* Class-identifier */ 707 len = strlen(vendor_class_identifier); 708 *e++ = len; 709 memcpy(e, vendor_class_identifier, len); 710 e += len; 711 } 712 len = strlen(dhcp_client_identifier + 1); 713 /* the minimum length of identifier is 2, include 1 byte type, 714 * and can not be larger than the length of options 715 */ 716 if (len >= 1 && len < 312 - (e - options) - 1) { 717 *e++ = 61; 718 *e++ = len + 1; 719 memcpy(e, dhcp_client_identifier, len + 1); 720 e += len + 1; 721 } 722 } 723 724 *e++ = 255; /* End of the list */ 725 } 726 727 #endif /* IPCONFIG_DHCP */ 728 729 static void __init ic_bootp_init_ext(u8 *e) 730 { 731 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 732 e += 4; 733 *e++ = 1; /* Subnet mask request */ 734 *e++ = 4; 735 e += 4; 736 *e++ = 3; /* Default gateway request */ 737 *e++ = 4; 738 e += 4; 739 #if CONF_NAMESERVERS_MAX > 0 740 *e++ = 6; /* (DNS) name server request */ 741 *e++ = 4 * CONF_NAMESERVERS_MAX; 742 e += 4 * CONF_NAMESERVERS_MAX; 743 #endif 744 *e++ = 12; /* Host name request */ 745 *e++ = 32; 746 e += 32; 747 *e++ = 40; /* NIS Domain name request */ 748 *e++ = 32; 749 e += 32; 750 *e++ = 17; /* Boot path */ 751 *e++ = 40; 752 e += 40; 753 754 *e++ = 57; /* set extension buffer size for reply */ 755 *e++ = 2; 756 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 757 *e++ = 150; 758 759 *e++ = 255; /* End of the list */ 760 } 761 762 763 /* 764 * Initialize the DHCP/BOOTP mechanism. 765 */ 766 static inline void __init ic_bootp_init(void) 767 { 768 /* Re-initialise all name servers and NTP servers to NONE, in case any 769 * were set via the "ip=" or "nfsaddrs=" kernel command line parameters: 770 * any IP addresses specified there will already have been decoded but 771 * are no longer needed 772 */ 773 ic_nameservers_predef(); 774 ic_ntp_servers_predef(); 775 776 dev_add_pack(&bootp_packet_type); 777 } 778 779 780 /* 781 * DHCP/BOOTP cleanup. 782 */ 783 static inline void __init ic_bootp_cleanup(void) 784 { 785 dev_remove_pack(&bootp_packet_type); 786 } 787 788 789 /* 790 * Send DHCP/BOOTP request to single interface. 791 */ 792 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 793 { 794 struct net_device *dev = d->dev; 795 struct sk_buff *skb; 796 struct bootp_pkt *b; 797 struct iphdr *h; 798 int hlen = LL_RESERVED_SPACE(dev); 799 int tlen = dev->needed_tailroom; 800 801 /* Allocate packet */ 802 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, 803 GFP_KERNEL); 804 if (!skb) 805 return; 806 skb_reserve(skb, hlen); 807 b = skb_put_zero(skb, sizeof(struct bootp_pkt)); 808 809 /* Construct IP header */ 810 skb_reset_network_header(skb); 811 h = ip_hdr(skb); 812 h->version = 4; 813 h->ihl = 5; 814 h->tot_len = htons(sizeof(struct bootp_pkt)); 815 h->frag_off = htons(IP_DF); 816 h->ttl = 64; 817 h->protocol = IPPROTO_UDP; 818 h->daddr = htonl(INADDR_BROADCAST); 819 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 820 821 /* Construct UDP header */ 822 b->udph.source = htons(68); 823 b->udph.dest = htons(67); 824 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 825 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 826 827 /* Construct DHCP/BOOTP header */ 828 b->op = BOOTP_REQUEST; 829 if (dev->type < 256) /* check for false types */ 830 b->htype = dev->type; 831 else if (dev->type == ARPHRD_FDDI) 832 b->htype = ARPHRD_ETHER; 833 else { 834 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type, 835 dev->name); 836 b->htype = dev->type; /* can cause undefined behavior */ 837 } 838 839 /* server_ip and your_ip address are both already zero per RFC2131 */ 840 b->hlen = dev->addr_len; 841 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 842 b->secs = htons(jiffies_diff / HZ); 843 b->xid = d->xid; 844 845 /* add DHCP options or BOOTP extensions */ 846 #ifdef IPCONFIG_DHCP 847 if (ic_proto_enabled & IC_USE_DHCP) 848 ic_dhcp_init_options(b->exten, d); 849 else 850 #endif 851 ic_bootp_init_ext(b->exten); 852 853 /* Chain packet down the line... */ 854 skb->dev = dev; 855 skb->protocol = htons(ETH_P_IP); 856 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 857 dev->broadcast, dev->dev_addr, skb->len) < 0) { 858 kfree_skb(skb); 859 printk("E"); 860 return; 861 } 862 863 if (dev_queue_xmit(skb) < 0) 864 printk("E"); 865 } 866 867 868 /* 869 * Copy BOOTP-supplied string if not already set. 870 */ 871 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 872 { 873 if (!len) 874 return 0; 875 if (len > max-1) 876 len = max-1; 877 memcpy(dest, src, len); 878 dest[len] = '\0'; 879 return 1; 880 } 881 882 883 /* 884 * Process BOOTP extensions. 885 */ 886 static void __init ic_do_bootp_ext(u8 *ext) 887 { 888 u8 servers; 889 int i; 890 __be16 mtu; 891 892 u8 *c; 893 894 pr_debug("DHCP/BOOTP: Got extension %d:", *ext); 895 for (c=ext+2; c<ext+2+ext[1]; c++) 896 pr_debug(" %02x", *c); 897 pr_debug("\n"); 898 899 switch (*ext++) { 900 case 1: /* Subnet mask */ 901 if (ic_netmask == NONE) 902 memcpy(&ic_netmask, ext+1, 4); 903 break; 904 case 3: /* Default gateway */ 905 if (ic_gateway == NONE) 906 memcpy(&ic_gateway, ext+1, 4); 907 break; 908 case 6: /* DNS server */ 909 servers= *ext/4; 910 if (servers > CONF_NAMESERVERS_MAX) 911 servers = CONF_NAMESERVERS_MAX; 912 for (i = 0; i < servers; i++) { 913 if (ic_nameservers[i] == NONE) 914 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 915 } 916 break; 917 case 12: /* Host name */ 918 ic_bootp_string(utsname()->nodename, ext+1, *ext, 919 __NEW_UTS_LEN); 920 ic_host_name_set = 1; 921 break; 922 case 15: /* Domain name (DNS) */ 923 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 924 break; 925 case 17: /* Root path */ 926 if (!root_server_path[0]) 927 ic_bootp_string(root_server_path, ext+1, *ext, 928 sizeof(root_server_path)); 929 break; 930 case 26: /* Interface MTU */ 931 memcpy(&mtu, ext+1, sizeof(mtu)); 932 ic_dev_mtu = ntohs(mtu); 933 break; 934 case 40: /* NIS Domain name (_not_ DNS) */ 935 ic_bootp_string(utsname()->domainname, ext+1, *ext, 936 __NEW_UTS_LEN); 937 break; 938 case 42: /* NTP servers */ 939 servers = *ext / 4; 940 if (servers > CONF_NTP_SERVERS_MAX) 941 servers = CONF_NTP_SERVERS_MAX; 942 for (i = 0; i < servers; i++) { 943 if (ic_ntp_servers[i] == NONE) 944 memcpy(&ic_ntp_servers[i], ext+1+4*i, 4); 945 } 946 break; 947 } 948 } 949 950 951 /* 952 * Receive BOOTP reply. 953 */ 954 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 955 { 956 struct bootp_pkt *b; 957 struct iphdr *h; 958 struct ic_device *d; 959 int len, ext_len; 960 961 if (!net_eq(dev_net(dev), &init_net)) 962 goto drop; 963 964 /* Perform verifications before taking the lock. */ 965 if (skb->pkt_type == PACKET_OTHERHOST) 966 goto drop; 967 968 skb = skb_share_check(skb, GFP_ATOMIC); 969 if (!skb) 970 return NET_RX_DROP; 971 972 if (!pskb_may_pull(skb, 973 sizeof(struct iphdr) + 974 sizeof(struct udphdr))) 975 goto drop; 976 977 b = (struct bootp_pkt *)skb_network_header(skb); 978 h = &b->iph; 979 980 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 981 goto drop; 982 983 /* Fragments are not supported */ 984 if (ip_is_fragment(h)) { 985 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); 986 goto drop; 987 } 988 989 if (skb->len < ntohs(h->tot_len)) 990 goto drop; 991 992 if (ip_fast_csum((char *) h, h->ihl)) 993 goto drop; 994 995 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 996 goto drop; 997 998 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 999 goto drop; 1000 1001 len = ntohs(b->udph.len) - sizeof(struct udphdr); 1002 ext_len = len - (sizeof(*b) - 1003 sizeof(struct iphdr) - 1004 sizeof(struct udphdr) - 1005 sizeof(b->exten)); 1006 if (ext_len < 0) 1007 goto drop; 1008 1009 /* Ok the front looks good, make sure we can get at the rest. */ 1010 if (!pskb_may_pull(skb, skb->len)) 1011 goto drop; 1012 1013 b = (struct bootp_pkt *)skb_network_header(skb); 1014 h = &b->iph; 1015 1016 /* One reply at a time, please. */ 1017 spin_lock(&ic_recv_lock); 1018 1019 /* If we already have a reply, just drop the packet */ 1020 if (ic_got_reply) 1021 goto drop_unlock; 1022 1023 /* Find the ic_device that the packet arrived on */ 1024 d = ic_first_dev; 1025 while (d && d->dev != dev) 1026 d = d->next; 1027 if (!d) 1028 goto drop_unlock; /* should never happen */ 1029 1030 /* Is it a reply to our BOOTP request? */ 1031 if (b->op != BOOTP_REPLY || 1032 b->xid != d->xid) { 1033 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n", 1034 d->dev->name, b->op, b->xid); 1035 goto drop_unlock; 1036 } 1037 1038 /* Parse extensions */ 1039 if (ext_len >= 4 && 1040 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1041 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1042 u8 *ext; 1043 1044 #ifdef IPCONFIG_DHCP 1045 if (ic_proto_enabled & IC_USE_DHCP) { 1046 __be32 server_id = NONE; 1047 int mt = 0; 1048 1049 ext = &b->exten[4]; 1050 while (ext < end && *ext != 0xff) { 1051 u8 *opt = ext++; 1052 if (*opt == 0) /* Padding */ 1053 continue; 1054 ext += *ext + 1; 1055 if (ext >= end) 1056 break; 1057 switch (*opt) { 1058 case 53: /* Message type */ 1059 if (opt[1]) 1060 mt = opt[2]; 1061 break; 1062 case 54: /* Server ID (IP address) */ 1063 if (opt[1] >= 4) 1064 memcpy(&server_id, opt + 2, 4); 1065 break; 1066 } 1067 } 1068 1069 pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name); 1070 1071 switch (mt) { 1072 case DHCPOFFER: 1073 /* While in the process of accepting one offer, 1074 * ignore all others. 1075 */ 1076 if (ic_myaddr != NONE) 1077 goto drop_unlock; 1078 1079 /* Let's accept that offer. */ 1080 ic_myaddr = b->your_ip; 1081 ic_servaddr = server_id; 1082 pr_debug("DHCP: Offered address %pI4 by server %pI4\n", 1083 &ic_myaddr, &b->iph.saddr); 1084 /* The DHCP indicated server address takes 1085 * precedence over the bootp header one if 1086 * they are different. 1087 */ 1088 if ((server_id != NONE) && 1089 (b->server_ip != server_id)) 1090 b->server_ip = ic_servaddr; 1091 break; 1092 1093 case DHCPACK: 1094 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1095 goto drop_unlock; 1096 1097 /* Yeah! */ 1098 break; 1099 1100 default: 1101 /* Urque. Forget it*/ 1102 ic_myaddr = NONE; 1103 ic_servaddr = NONE; 1104 goto drop_unlock; 1105 } 1106 1107 ic_dhcp_msgtype = mt; 1108 1109 } 1110 #endif /* IPCONFIG_DHCP */ 1111 1112 ext = &b->exten[4]; 1113 while (ext < end && *ext != 0xff) { 1114 u8 *opt = ext++; 1115 if (*opt == 0) /* Padding */ 1116 continue; 1117 ext += *ext + 1; 1118 if (ext < end) 1119 ic_do_bootp_ext(opt); 1120 } 1121 } 1122 1123 /* We have a winner! */ 1124 ic_dev = d; 1125 ic_myaddr = b->your_ip; 1126 ic_servaddr = b->server_ip; 1127 ic_addrservaddr = b->iph.saddr; 1128 if (ic_gateway == NONE && b->relay_ip) 1129 ic_gateway = b->relay_ip; 1130 if (ic_nameservers[0] == NONE) 1131 ic_nameservers[0] = ic_servaddr; 1132 ic_got_reply = IC_BOOTP; 1133 1134 drop_unlock: 1135 /* Show's over. Nothing to see here. */ 1136 spin_unlock(&ic_recv_lock); 1137 1138 drop: 1139 /* Throw the packet out. */ 1140 kfree_skb(skb); 1141 1142 return 0; 1143 } 1144 1145 1146 #endif 1147 1148 1149 /* 1150 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1151 */ 1152 1153 #ifdef IPCONFIG_DYNAMIC 1154 1155 static int __init ic_dynamic(void) 1156 { 1157 int retries; 1158 struct ic_device *d; 1159 unsigned long start_jiffies, timeout, jiff; 1160 int do_bootp = ic_proto_have_if & IC_BOOTP; 1161 int do_rarp = ic_proto_have_if & IC_RARP; 1162 1163 /* 1164 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1165 * This routine gets only called when some pieces of information 1166 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1167 */ 1168 if (!ic_proto_enabled) { 1169 pr_err("IP-Config: Incomplete network configuration information\n"); 1170 return -1; 1171 } 1172 1173 #ifdef IPCONFIG_BOOTP 1174 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1175 pr_err("DHCP/BOOTP: No suitable device found\n"); 1176 #endif 1177 #ifdef IPCONFIG_RARP 1178 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1179 pr_err("RARP: No suitable device found\n"); 1180 #endif 1181 1182 if (!ic_proto_have_if) 1183 /* Error message already printed */ 1184 return -1; 1185 1186 /* 1187 * Setup protocols 1188 */ 1189 #ifdef IPCONFIG_BOOTP 1190 if (do_bootp) 1191 ic_bootp_init(); 1192 #endif 1193 #ifdef IPCONFIG_RARP 1194 if (do_rarp) 1195 ic_rarp_init(); 1196 #endif 1197 1198 /* 1199 * Send requests and wait, until we get an answer. This loop 1200 * seems to be a terrible waste of CPU time, but actually there is 1201 * only one process running at all, so we don't need to use any 1202 * scheduler functions. 1203 * [Actually we could now, but the nothing else running note still 1204 * applies.. - AC] 1205 */ 1206 pr_notice("Sending %s%s%s requests .", 1207 do_bootp 1208 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1209 (do_bootp && do_rarp) ? " and " : "", 1210 do_rarp ? "RARP" : ""); 1211 1212 start_jiffies = jiffies; 1213 d = ic_first_dev; 1214 retries = CONF_SEND_RETRIES; 1215 get_random_bytes(&timeout, sizeof(timeout)); 1216 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); 1217 for (;;) { 1218 #ifdef IPCONFIG_BOOTP 1219 if (do_bootp && (d->able & IC_BOOTP)) 1220 ic_bootp_send_if(d, jiffies - start_jiffies); 1221 #endif 1222 #ifdef IPCONFIG_RARP 1223 if (do_rarp && (d->able & IC_RARP)) 1224 ic_rarp_send_if(d); 1225 #endif 1226 1227 if (!d->next) { 1228 jiff = jiffies + timeout; 1229 while (time_before(jiffies, jiff) && !ic_got_reply) 1230 schedule_timeout_uninterruptible(1); 1231 } 1232 #ifdef IPCONFIG_DHCP 1233 /* DHCP isn't done until we get a DHCPACK. */ 1234 if ((ic_got_reply & IC_BOOTP) && 1235 (ic_proto_enabled & IC_USE_DHCP) && 1236 ic_dhcp_msgtype != DHCPACK) { 1237 ic_got_reply = 0; 1238 /* continue on device that got the reply */ 1239 d = ic_dev; 1240 pr_cont(","); 1241 continue; 1242 } 1243 #endif /* IPCONFIG_DHCP */ 1244 1245 if (ic_got_reply) { 1246 pr_cont(" OK\n"); 1247 break; 1248 } 1249 1250 if ((d = d->next)) 1251 continue; 1252 1253 if (! --retries) { 1254 pr_cont(" timed out!\n"); 1255 break; 1256 } 1257 1258 d = ic_first_dev; 1259 1260 timeout = timeout CONF_TIMEOUT_MULT; 1261 if (timeout > CONF_TIMEOUT_MAX) 1262 timeout = CONF_TIMEOUT_MAX; 1263 1264 pr_cont("."); 1265 } 1266 1267 #ifdef IPCONFIG_BOOTP 1268 if (do_bootp) 1269 ic_bootp_cleanup(); 1270 #endif 1271 #ifdef IPCONFIG_RARP 1272 if (do_rarp) 1273 ic_rarp_cleanup(); 1274 #endif 1275 1276 if (!ic_got_reply) { 1277 ic_myaddr = NONE; 1278 return -1; 1279 } 1280 1281 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n", 1282 ((ic_got_reply & IC_RARP) ? "RARP" 1283 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1284 &ic_addrservaddr, &ic_myaddr); 1285 1286 return 0; 1287 } 1288 1289 #endif /* IPCONFIG_DYNAMIC */ 1290 1291 #ifdef CONFIG_PROC_FS 1292 /* proc_dir_entry for /proc/net/ipconfig */ 1293 static struct proc_dir_entry *ipconfig_dir; 1294 1295 /* Name servers: */ 1296 static int pnp_seq_show(struct seq_file *seq, void *v) 1297 { 1298 int i; 1299 1300 if (ic_proto_used & IC_PROTO) 1301 seq_printf(seq, "#PROTO: %s\n", 1302 (ic_proto_used & IC_RARP) ? "RARP" 1303 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1304 else 1305 seq_puts(seq, "#MANUAL\n"); 1306 1307 if (ic_domain[0]) 1308 seq_printf(seq, 1309 "domain %s\n", ic_domain); 1310 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1311 if (ic_nameservers[i] != NONE) 1312 seq_printf(seq, "nameserver %pI4\n", 1313 &ic_nameservers[i]); 1314 } 1315 if (ic_servaddr != NONE) 1316 seq_printf(seq, "bootserver %pI4\n", 1317 &ic_servaddr); 1318 return 0; 1319 } 1320 1321 /* Create the /proc/net/ipconfig directory */ 1322 static int __init ipconfig_proc_net_init(void) 1323 { 1324 ipconfig_dir = proc_net_mkdir(&init_net, "ipconfig", init_net.proc_net); 1325 if (!ipconfig_dir) 1326 return -ENOMEM; 1327 1328 return 0; 1329 } 1330 1331 /* Create a new file under /proc/net/ipconfig */ 1332 static int ipconfig_proc_net_create(const char *name, 1333 const struct file_operations *fops) 1334 { 1335 char *pname; 1336 struct proc_dir_entry *p; 1337 1338 if (!ipconfig_dir) 1339 return -ENOMEM; 1340 1341 pname = kasprintf(GFP_KERNEL, "%s%s", "ipconfig/", name); 1342 if (!pname) 1343 return -ENOMEM; 1344 1345 p = proc_create(pname, 0444, init_net.proc_net, fops); 1346 kfree(pname); 1347 if (!p) 1348 return -ENOMEM; 1349 1350 return 0; 1351 } 1352 1353 /* Write NTP server IP addresses to /proc/net/ipconfig/ntp_servers */ 1354 static int ntp_servers_seq_show(struct seq_file *seq, void *v) 1355 { 1356 int i; 1357 1358 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) { 1359 if (ic_ntp_servers[i] != NONE) 1360 seq_printf(seq, "%pI4\n", &ic_ntp_servers[i]); 1361 } 1362 return 0; 1363 } 1364 1365 static int ntp_servers_seq_open(struct inode *inode, struct file *file) 1366 { 1367 return single_open(file, ntp_servers_seq_show, NULL); 1368 } 1369 1370 static const struct file_operations ntp_servers_seq_fops = { 1371 .open = ntp_servers_seq_open, 1372 .read = seq_read, 1373 .llseek = seq_lseek, 1374 .release = single_release, 1375 }; 1376 #endif /* CONFIG_PROC_FS */ 1377 1378 /* 1379 * Extract IP address from the parameter string if needed. Note that we 1380 * need to have root_server_addr set _before_ IPConfig gets called as it 1381 * can override it. 1382 */ 1383 __be32 __init root_nfs_parse_addr(char *name) 1384 { 1385 __be32 addr; 1386 int octets = 0; 1387 char *cp, *cq; 1388 1389 cp = cq = name; 1390 while (octets < 4) { 1391 while (*cp >= '0' && *cp <= '9') 1392 cp++; 1393 if (cp == cq || cp - cq > 3) 1394 break; 1395 if (*cp == '.' || octets == 3) 1396 octets++; 1397 if (octets < 4) 1398 cp++; 1399 cq = cp; 1400 } 1401 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1402 if (*cp == ':') 1403 *cp++ = '\0'; 1404 addr = in_aton(name); 1405 memmove(name, cp, strlen(cp) + 1); 1406 } else 1407 addr = NONE; 1408 1409 return addr; 1410 } 1411 1412 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1413 1414 static int __init wait_for_devices(void) 1415 { 1416 int i; 1417 1418 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1419 struct net_device *dev; 1420 int found = 0; 1421 1422 rtnl_lock(); 1423 for_each_netdev(&init_net, dev) { 1424 if (ic_is_init_dev(dev)) { 1425 found = 1; 1426 break; 1427 } 1428 } 1429 rtnl_unlock(); 1430 if (found) 1431 return 0; 1432 ssleep(1); 1433 } 1434 return -ENODEV; 1435 } 1436 1437 /* 1438 * IP Autoconfig dispatcher. 1439 */ 1440 1441 static int __init ip_auto_config(void) 1442 { 1443 __be32 addr; 1444 #ifdef IPCONFIG_DYNAMIC 1445 int retries = CONF_OPEN_RETRIES; 1446 #endif 1447 int err; 1448 unsigned int i; 1449 1450 /* Initialise all name servers and NTP servers to NONE (but only if the 1451 * "ip=" or "nfsaddrs=" kernel command line parameters weren't decoded, 1452 * otherwise we'll overwrite the IP addresses specified there) 1453 */ 1454 if (ic_set_manually == 0) { 1455 ic_nameservers_predef(); 1456 ic_ntp_servers_predef(); 1457 } 1458 1459 #ifdef CONFIG_PROC_FS 1460 proc_create_single("pnp", 0444, init_net.proc_net, pnp_seq_show); 1461 1462 if (ipconfig_proc_net_init() == 0) 1463 ipconfig_proc_net_create("ntp_servers", &ntp_servers_seq_fops); 1464 #endif /* CONFIG_PROC_FS */ 1465 1466 if (!ic_enable) 1467 return 0; 1468 1469 pr_debug("IP-Config: Entered.\n"); 1470 #ifdef IPCONFIG_DYNAMIC 1471 try_try_again: 1472 #endif 1473 /* Wait for devices to appear */ 1474 err = wait_for_devices(); 1475 if (err) 1476 return err; 1477 1478 /* Setup all network devices */ 1479 err = ic_open_devs(); 1480 if (err) 1481 return err; 1482 1483 /* Give drivers a chance to settle */ 1484 msleep(CONF_POST_OPEN); 1485 1486 /* 1487 * If the config information is insufficient (e.g., our IP address or 1488 * IP address of the boot server is missing or we have multiple network 1489 * interfaces and no default was set), use BOOTP or RARP to get the 1490 * missing values. 1491 */ 1492 if (ic_myaddr == NONE || 1493 #ifdef CONFIG_ROOT_NFS 1494 (root_server_addr == NONE && 1495 ic_servaddr == NONE && 1496 ROOT_DEV == Root_NFS) || 1497 #endif 1498 ic_first_dev->next) { 1499 #ifdef IPCONFIG_DYNAMIC 1500 if (ic_dynamic() < 0) { 1501 ic_close_devs(); 1502 1503 /* 1504 * I don't know why, but sometimes the 1505 * eepro100 driver (at least) gets upset and 1506 * doesn't work the first time it's opened. 1507 * But then if you close it and reopen it, it 1508 * works just fine. So we need to try that at 1509 * least once before giving up. 1510 * 1511 * Also, if the root will be NFS-mounted, we 1512 * have nowhere to go if DHCP fails. So we 1513 * just have to keep trying forever. 1514 * 1515 * -- Chip 1516 */ 1517 #ifdef CONFIG_ROOT_NFS 1518 if (ROOT_DEV == Root_NFS) { 1519 pr_err("IP-Config: Retrying forever (NFS root)...\n"); 1520 goto try_try_again; 1521 } 1522 #endif 1523 1524 if (--retries) { 1525 pr_err("IP-Config: Reopening network devices...\n"); 1526 goto try_try_again; 1527 } 1528 1529 /* Oh, well. At least we tried. */ 1530 pr_err("IP-Config: Auto-configuration of network failed\n"); 1531 return -1; 1532 } 1533 #else /* !DYNAMIC */ 1534 pr_err("IP-Config: Incomplete network configuration information\n"); 1535 ic_close_devs(); 1536 return -1; 1537 #endif /* IPCONFIG_DYNAMIC */ 1538 } else { 1539 /* Device selected manually or only one device -> use it */ 1540 ic_dev = ic_first_dev; 1541 } 1542 1543 addr = root_nfs_parse_addr(root_server_path); 1544 if (root_server_addr == NONE) 1545 root_server_addr = addr; 1546 1547 /* 1548 * Use defaults wherever applicable. 1549 */ 1550 if (ic_defaults() < 0) 1551 return -1; 1552 1553 /* 1554 * Record which protocol was actually used. 1555 */ 1556 #ifdef IPCONFIG_DYNAMIC 1557 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1558 #endif 1559 1560 #ifndef IPCONFIG_SILENT 1561 /* 1562 * Clue in the operator. 1563 */ 1564 pr_info("IP-Config: Complete:\n"); 1565 1566 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", 1567 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr, 1568 &ic_myaddr, &ic_netmask, &ic_gateway); 1569 pr_info(" host=%s, domain=%s, nis-domain=%s\n", 1570 utsname()->nodename, ic_domain, utsname()->domainname); 1571 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", 1572 &ic_servaddr, &root_server_addr, root_server_path); 1573 if (ic_dev_mtu) 1574 pr_cont(", mtu=%d", ic_dev_mtu); 1575 /* Name servers (if any): */ 1576 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1577 if (ic_nameservers[i] != NONE) { 1578 if (i == 0) 1579 pr_info(" nameserver%u=%pI4", 1580 i, &ic_nameservers[i]); 1581 else 1582 pr_cont(", nameserver%u=%pI4", 1583 i, &ic_nameservers[i]); 1584 } 1585 if (i + 1 == CONF_NAMESERVERS_MAX) 1586 pr_cont("\n"); 1587 } 1588 /* NTP servers (if any): */ 1589 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) { 1590 if (ic_ntp_servers[i] != NONE) { 1591 if (i == 0) 1592 pr_info(" ntpserver%u=%pI4", 1593 i, &ic_ntp_servers[i]); 1594 else 1595 pr_cont(", ntpserver%u=%pI4", 1596 i, &ic_ntp_servers[i]); 1597 } 1598 if (i + 1 == CONF_NTP_SERVERS_MAX) 1599 pr_cont("\n"); 1600 } 1601 #endif /* !SILENT */ 1602 1603 /* 1604 * Close all network devices except the device we've 1605 * autoconfigured and set up routes. 1606 */ 1607 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1608 err = -1; 1609 else 1610 err = 0; 1611 1612 ic_close_devs(); 1613 1614 return err; 1615 } 1616 1617 late_initcall(ip_auto_config); 1618 1619 1620 /* 1621 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1622 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. 1623 */ 1624 static int __init ic_proto_name(char *name) 1625 { 1626 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1627 return 1; 1628 } 1629 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1630 return 0; 1631 } 1632 #ifdef CONFIG_IP_PNP_DHCP 1633 else if (!strncmp(name, "dhcp", 4)) { 1634 char *client_id; 1635 1636 ic_proto_enabled &= ~IC_RARP; 1637 client_id = strstr(name, "dhcp,"); 1638 if (client_id) { 1639 char *v; 1640 1641 client_id = client_id + 5; 1642 v = strchr(client_id, ','); 1643 if (!v) 1644 return 1; 1645 *v = 0; 1646 if (kstrtou8(client_id, 0, dhcp_client_identifier)) 1647 pr_debug("DHCP: Invalid client identifier type\n"); 1648 strncpy(dhcp_client_identifier + 1, v + 1, 251); 1649 *v = ','; 1650 } 1651 return 1; 1652 } 1653 #endif 1654 #ifdef CONFIG_IP_PNP_BOOTP 1655 else if (!strcmp(name, "bootp")) { 1656 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1657 return 1; 1658 } 1659 #endif 1660 #ifdef CONFIG_IP_PNP_RARP 1661 else if (!strcmp(name, "rarp")) { 1662 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1663 return 1; 1664 } 1665 #endif 1666 #ifdef IPCONFIG_DYNAMIC 1667 else if (!strcmp(name, "both")) { 1668 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1669 return 1; 1670 } 1671 #endif 1672 return 0; 1673 } 1674 1675 static int __init ip_auto_config_setup(char *addrs) 1676 { 1677 char *cp, *ip, *dp; 1678 int num = 0; 1679 1680 ic_set_manually = 1; 1681 ic_enable = 1; 1682 1683 /* 1684 * If any dhcp, bootp etc options are set, leave autoconfig on 1685 * and skip the below static IP processing. 1686 */ 1687 if (ic_proto_name(addrs)) 1688 return 1; 1689 1690 /* If no static IP is given, turn off autoconfig and bail. */ 1691 if (*addrs == 0 || 1692 strcmp(addrs, "off") == 0 || 1693 strcmp(addrs, "none") == 0) { 1694 ic_enable = 0; 1695 return 1; 1696 } 1697 1698 /* Initialise all name servers and NTP servers to NONE */ 1699 ic_nameservers_predef(); 1700 ic_ntp_servers_predef(); 1701 1702 /* Parse string for static IP assignment. */ 1703 ip = addrs; 1704 while (ip && *ip) { 1705 if ((cp = strchr(ip, ':'))) 1706 *cp++ = '\0'; 1707 if (strlen(ip) > 0) { 1708 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip); 1709 switch (num) { 1710 case 0: 1711 if ((ic_myaddr = in_aton(ip)) == ANY) 1712 ic_myaddr = NONE; 1713 break; 1714 case 1: 1715 if ((ic_servaddr = in_aton(ip)) == ANY) 1716 ic_servaddr = NONE; 1717 break; 1718 case 2: 1719 if ((ic_gateway = in_aton(ip)) == ANY) 1720 ic_gateway = NONE; 1721 break; 1722 case 3: 1723 if ((ic_netmask = in_aton(ip)) == ANY) 1724 ic_netmask = NONE; 1725 break; 1726 case 4: 1727 if ((dp = strchr(ip, '.'))) { 1728 *dp++ = '\0'; 1729 strlcpy(utsname()->domainname, dp, 1730 sizeof(utsname()->domainname)); 1731 } 1732 strlcpy(utsname()->nodename, ip, 1733 sizeof(utsname()->nodename)); 1734 ic_host_name_set = 1; 1735 break; 1736 case 5: 1737 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1738 break; 1739 case 6: 1740 if (ic_proto_name(ip) == 0 && 1741 ic_myaddr == NONE) { 1742 ic_enable = 0; 1743 } 1744 break; 1745 case 7: 1746 if (CONF_NAMESERVERS_MAX >= 1) { 1747 ic_nameservers[0] = in_aton(ip); 1748 if (ic_nameservers[0] == ANY) 1749 ic_nameservers[0] = NONE; 1750 } 1751 break; 1752 case 8: 1753 if (CONF_NAMESERVERS_MAX >= 2) { 1754 ic_nameservers[1] = in_aton(ip); 1755 if (ic_nameservers[1] == ANY) 1756 ic_nameservers[1] = NONE; 1757 } 1758 break; 1759 case 9: 1760 if (CONF_NTP_SERVERS_MAX >= 1) { 1761 ic_ntp_servers[0] = in_aton(ip); 1762 if (ic_ntp_servers[0] == ANY) 1763 ic_ntp_servers[0] = NONE; 1764 } 1765 break; 1766 } 1767 } 1768 ip = cp; 1769 num++; 1770 } 1771 1772 return 1; 1773 } 1774 __setup("ip=", ip_auto_config_setup); 1775 1776 static int __init nfsaddrs_config_setup(char *addrs) 1777 { 1778 return ip_auto_config_setup(addrs); 1779 } 1780 __setup("nfsaddrs=", nfsaddrs_config_setup); 1781 1782 static int __init vendor_class_identifier_setup(char *addrs) 1783 { 1784 if (strlcpy(vendor_class_identifier, addrs, 1785 sizeof(vendor_class_identifier)) 1786 >= sizeof(vendor_class_identifier)) 1787 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n", 1788 vendor_class_identifier); 1789 return 1; 1790 } 1791 __setup("dhcpclass=", vendor_class_identifier_setup); 1792