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