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