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/ip.h> 65 #include <net/ipconfig.h> 66 #include <net/route.h> 67 68 #include <linux/uaccess.h> 69 #include <net/checksum.h> 70 #include <asm/processor.h> 71 72 #if defined(CONFIG_IP_PNP_DHCP) 73 #define IPCONFIG_DHCP 74 #endif 75 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) 76 #define IPCONFIG_BOOTP 77 #endif 78 #if defined(CONFIG_IP_PNP_RARP) 79 #define IPCONFIG_RARP 80 #endif 81 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) 82 #define IPCONFIG_DYNAMIC 83 #endif 84 85 /* Define the friendly delay before and after opening net devices */ 86 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */ 87 88 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ 89 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ 90 #define CONF_SEND_RETRIES 6 /* Send six requests per open */ 91 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ 92 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ 93 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ 94 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ 95 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers 96 - '3' from resolv.h */ 97 #define CONF_NTP_SERVERS_MAX 3 /* Maximum number of NTP servers */ 98 99 #define NONE cpu_to_be32(INADDR_NONE) 100 #define ANY cpu_to_be32(INADDR_ANY) 101 102 /* Wait for carrier timeout default in seconds */ 103 static unsigned int carrier_timeout = 120; 104 105 /* 106 * Public IP configuration 107 */ 108 109 /* This is used by platforms which might be able to set the ipconfig 110 * variables using firmware environment vars. If this is set, it will 111 * ignore such firmware variables. 112 */ 113 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ 114 115 static int ic_enable __initdata; /* IP config enabled? */ 116 117 /* Protocol choice */ 118 int ic_proto_enabled __initdata = 0 119 #ifdef IPCONFIG_BOOTP 120 | IC_BOOTP 121 #endif 122 #ifdef CONFIG_IP_PNP_DHCP 123 | IC_USE_DHCP 124 #endif 125 #ifdef IPCONFIG_RARP 126 | IC_RARP 127 #endif 128 ; 129 130 static int ic_host_name_set __initdata; /* Host name set by us? */ 131 132 __be32 ic_myaddr = NONE; /* My IP address */ 133 static __be32 ic_netmask = NONE; /* Netmask for local subnet */ 134 __be32 ic_gateway = NONE; /* Gateway IP address */ 135 136 #ifdef IPCONFIG_DYNAMIC 137 static __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */ 138 #endif 139 140 __be32 ic_servaddr = NONE; /* Boot server IP address */ 141 142 __be32 root_server_addr = NONE; /* Address of NFS server */ 143 u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 144 145 /* vendor class identifier */ 146 static char vendor_class_identifier[253] __initdata; 147 148 #if defined(CONFIG_IP_PNP_DHCP) 149 static char dhcp_client_identifier[253] __initdata; 150 #endif 151 152 /* Persistent data: */ 153 154 #ifdef IPCONFIG_DYNAMIC 155 static int ic_proto_used; /* Protocol used, if any */ 156 #else 157 #define ic_proto_used 0 158 #endif 159 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 160 static __be32 ic_ntp_servers[CONF_NTP_SERVERS_MAX]; /* NTP server IP addresses */ 161 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 162 163 /* 164 * Private state. 165 */ 166 167 /* Name of user-selected boot device */ 168 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 169 170 /* Protocols supported by available interfaces */ 171 static int ic_proto_have_if __initdata; 172 173 /* MTU for boot device */ 174 static int ic_dev_mtu __initdata; 175 176 #ifdef IPCONFIG_DYNAMIC 177 static DEFINE_SPINLOCK(ic_recv_lock); 178 static volatile int ic_got_reply __initdata; /* Proto(s) that replied */ 179 #endif 180 #ifdef IPCONFIG_DHCP 181 static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */ 182 #endif 183 184 185 /* 186 * Network devices 187 */ 188 189 struct ic_device { 190 struct ic_device *next; 191 struct net_device *dev; 192 unsigned short flags; 193 short able; 194 __be32 xid; 195 }; 196 197 static struct ic_device *ic_first_dev __initdata; /* List of open device */ 198 static struct ic_device *ic_dev __initdata; /* Selected device */ 199 200 static bool __init ic_is_init_dev(struct net_device *dev) 201 { 202 if (dev->flags & IFF_LOOPBACK) 203 return false; 204 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 205 (!(dev->flags & IFF_LOOPBACK) && 206 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 207 strncmp(dev->name, "dummy", 5)); 208 } 209 210 static int __init ic_open_devs(void) 211 { 212 struct ic_device *d, **last; 213 struct net_device *dev; 214 unsigned short oflags; 215 unsigned long start, next_msg; 216 217 last = &ic_first_dev; 218 rtnl_lock(); 219 220 /* bring loopback device up first */ 221 for_each_netdev(&init_net, dev) { 222 if (!(dev->flags & IFF_LOOPBACK)) 223 continue; 224 if (dev_change_flags(dev, dev->flags | IFF_UP, NULL) < 0) 225 pr_err("IP-Config: Failed to open %s\n", dev->name); 226 } 227 228 for_each_netdev(&init_net, dev) { 229 if (ic_is_init_dev(dev)) { 230 int able = 0; 231 if (dev->mtu >= 364) 232 able |= IC_BOOTP; 233 else 234 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n", 235 dev->name, dev->mtu); 236 if (!(dev->flags & IFF_NOARP)) 237 able |= IC_RARP; 238 able &= ic_proto_enabled; 239 if (ic_proto_enabled && !able) 240 continue; 241 oflags = dev->flags; 242 if (dev_change_flags(dev, oflags | IFF_UP, NULL) < 0) { 243 pr_err("IP-Config: Failed to open %s\n", 244 dev->name); 245 continue; 246 } 247 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 248 rtnl_unlock(); 249 return -ENOMEM; 250 } 251 d->dev = dev; 252 *last = d; 253 last = &d->next; 254 d->flags = oflags; 255 d->able = able; 256 if (able & IC_BOOTP) 257 get_random_bytes(&d->xid, sizeof(__be32)); 258 else 259 d->xid = 0; 260 ic_proto_have_if |= able; 261 pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n", 262 dev->name, able, d->xid); 263 } 264 } 265 266 /* no point in waiting if we could not bring up at least one device */ 267 if (!ic_first_dev) 268 goto have_carrier; 269 270 /* wait for a carrier on at least one device */ 271 start = jiffies; 272 next_msg = start + msecs_to_jiffies(20000); 273 while (time_before(jiffies, start + 274 msecs_to_jiffies(carrier_timeout * 1000))) { 275 int wait, elapsed; 276 277 for_each_netdev(&init_net, dev) 278 if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) 279 goto have_carrier; 280 281 msleep(1); 282 283 if (time_before(jiffies, next_msg)) 284 continue; 285 286 elapsed = jiffies_to_msecs(jiffies - start); 287 wait = (carrier_timeout * 1000 - elapsed + 500) / 1000; 288 pr_info("Waiting up to %d more seconds for network.\n", wait); 289 next_msg = jiffies + msecs_to_jiffies(20000); 290 } 291 have_carrier: 292 rtnl_unlock(); 293 294 *last = NULL; 295 296 if (!ic_first_dev) { 297 if (user_dev_name[0]) 298 pr_err("IP-Config: Device `%s' not found\n", 299 user_dev_name); 300 else 301 pr_err("IP-Config: No network devices available\n"); 302 return -ENODEV; 303 } 304 return 0; 305 } 306 307 /* Close all network interfaces except the one we've autoconfigured, and its 308 * lowers, in case it's a stacked virtual interface. 309 */ 310 static void __init ic_close_devs(void) 311 { 312 struct net_device *selected_dev = ic_dev ? ic_dev->dev : NULL; 313 struct ic_device *d, *next; 314 struct net_device *dev; 315 316 rtnl_lock(); 317 next = ic_first_dev; 318 while ((d = next)) { 319 bool bring_down = (d != ic_dev); 320 struct net_device *lower; 321 struct list_head *iter; 322 323 next = d->next; 324 dev = d->dev; 325 326 if (selected_dev) { 327 netdev_for_each_lower_dev(selected_dev, lower, iter) { 328 if (dev == lower) { 329 bring_down = false; 330 break; 331 } 332 } 333 } 334 if (bring_down) { 335 pr_debug("IP-Config: Downing %s\n", dev->name); 336 dev_change_flags(dev, d->flags, NULL); 337 } 338 kfree(d); 339 } 340 rtnl_unlock(); 341 } 342 343 /* 344 * Interface to various network functions. 345 */ 346 347 static inline void 348 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 349 { 350 sin->sin_family = AF_INET; 351 sin->sin_addr.s_addr = addr; 352 sin->sin_port = port; 353 } 354 355 /* 356 * Set up interface addresses and routes. 357 */ 358 359 static int __init ic_setup_if(void) 360 { 361 struct ifreq ir; 362 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 363 int err; 364 365 memset(&ir, 0, sizeof(ir)); 366 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name); 367 set_sockaddr(sin, ic_myaddr, 0); 368 if ((err = devinet_ioctl(&init_net, SIOCSIFADDR, &ir)) < 0) { 369 pr_err("IP-Config: Unable to set interface address (%d)\n", 370 err); 371 return -1; 372 } 373 set_sockaddr(sin, ic_netmask, 0); 374 if ((err = devinet_ioctl(&init_net, SIOCSIFNETMASK, &ir)) < 0) { 375 pr_err("IP-Config: Unable to set interface netmask (%d)\n", 376 err); 377 return -1; 378 } 379 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 380 if ((err = devinet_ioctl(&init_net, SIOCSIFBRDADDR, &ir)) < 0) { 381 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n", 382 err); 383 return -1; 384 } 385 /* Handle the case where we need non-standard MTU on the boot link (a network 386 * using jumbo frames, for instance). If we can't set the mtu, don't error 387 * out, we'll try to muddle along. 388 */ 389 if (ic_dev_mtu != 0) { 390 rtnl_lock(); 391 if ((err = dev_set_mtu(ic_dev->dev, ic_dev_mtu)) < 0) 392 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", 393 ic_dev_mtu, err); 394 rtnl_unlock(); 395 } 396 return 0; 397 } 398 399 static int __init ic_setup_routes(void) 400 { 401 /* No need to setup device routes, only the default route... */ 402 403 if (ic_gateway != NONE) { 404 struct rtentry rm; 405 int err; 406 407 memset(&rm, 0, sizeof(rm)); 408 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 409 pr_err("IP-Config: Gateway not on directly connected network\n"); 410 return -1; 411 } 412 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 413 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 414 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 415 rm.rt_flags = RTF_UP | RTF_GATEWAY; 416 if ((err = ip_rt_ioctl(&init_net, SIOCADDRT, &rm)) < 0) { 417 pr_err("IP-Config: Cannot add default route (%d)\n", 418 err); 419 return -1; 420 } 421 } 422 423 return 0; 424 } 425 426 /* 427 * Fill in default values for all missing parameters. 428 */ 429 430 static int __init ic_defaults(void) 431 { 432 /* 433 * At this point we have no userspace running so need not 434 * claim locks on system_utsname 435 */ 436 437 if (!ic_host_name_set) 438 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 439 440 if (root_server_addr == NONE) 441 root_server_addr = ic_servaddr; 442 443 if (ic_netmask == NONE) { 444 if (IN_CLASSA(ntohl(ic_myaddr))) 445 ic_netmask = htonl(IN_CLASSA_NET); 446 else if (IN_CLASSB(ntohl(ic_myaddr))) 447 ic_netmask = htonl(IN_CLASSB_NET); 448 else if (IN_CLASSC(ntohl(ic_myaddr))) 449 ic_netmask = htonl(IN_CLASSC_NET); 450 else if (IN_CLASSE(ntohl(ic_myaddr))) 451 ic_netmask = htonl(IN_CLASSE_NET); 452 else { 453 pr_err("IP-Config: Unable to guess netmask for address %pI4\n", 454 &ic_myaddr); 455 return -1; 456 } 457 pr_notice("IP-Config: Guessing netmask %pI4\n", 458 &ic_netmask); 459 } 460 461 return 0; 462 } 463 464 /* 465 * RARP support. 466 */ 467 468 #ifdef IPCONFIG_RARP 469 470 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 471 472 static struct packet_type rarp_packet_type __initdata = { 473 .type = cpu_to_be16(ETH_P_RARP), 474 .func = ic_rarp_recv, 475 }; 476 477 static inline void __init ic_rarp_init(void) 478 { 479 dev_add_pack(&rarp_packet_type); 480 } 481 482 static inline void __init ic_rarp_cleanup(void) 483 { 484 dev_remove_pack(&rarp_packet_type); 485 } 486 487 /* 488 * Process received RARP packet. 489 */ 490 static int __init 491 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 492 { 493 struct arphdr *rarp; 494 unsigned char *rarp_ptr; 495 __be32 sip, tip; 496 unsigned char *tha; /* t for "target" */ 497 struct ic_device *d; 498 499 if (!net_eq(dev_net(dev), &init_net)) 500 goto drop; 501 502 skb = skb_share_check(skb, GFP_ATOMIC); 503 if (!skb) 504 return NET_RX_DROP; 505 506 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 507 goto drop; 508 509 /* Basic sanity checks can be done without the lock. */ 510 rarp = (struct arphdr *)skb_transport_header(skb); 511 512 /* If this test doesn't pass, it's not IP, or we should 513 * ignore it anyway. 514 */ 515 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 516 goto drop; 517 518 /* If it's not a RARP reply, delete it. */ 519 if (rarp->ar_op != htons(ARPOP_RREPLY)) 520 goto drop; 521 522 /* If it's not Ethernet, delete it. */ 523 if (rarp->ar_pro != htons(ETH_P_IP)) 524 goto drop; 525 526 if (!pskb_may_pull(skb, arp_hdr_len(dev))) 527 goto drop; 528 529 /* OK, it is all there and looks valid, process... */ 530 rarp = (struct arphdr *)skb_transport_header(skb); 531 rarp_ptr = (unsigned char *) (rarp + 1); 532 533 /* One reply at a time, please. */ 534 spin_lock(&ic_recv_lock); 535 536 /* If we already have a reply, just drop the packet */ 537 if (ic_got_reply) 538 goto drop_unlock; 539 540 /* Find the ic_device that the packet arrived on */ 541 d = ic_first_dev; 542 while (d && d->dev != dev) 543 d = d->next; 544 if (!d) 545 goto drop_unlock; /* should never happen */ 546 547 /* Extract variable-width fields */ 548 rarp_ptr += dev->addr_len; 549 memcpy(&sip, rarp_ptr, 4); 550 rarp_ptr += 4; 551 tha = rarp_ptr; 552 rarp_ptr += dev->addr_len; 553 memcpy(&tip, rarp_ptr, 4); 554 555 /* Discard packets which are not meant for us. */ 556 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 557 goto drop_unlock; 558 559 /* Discard packets which are not from specified server. */ 560 if (ic_servaddr != NONE && ic_servaddr != sip) 561 goto drop_unlock; 562 563 /* We have a winner! */ 564 ic_dev = d; 565 if (ic_myaddr == NONE) 566 ic_myaddr = tip; 567 ic_servaddr = sip; 568 ic_addrservaddr = sip; 569 ic_got_reply = IC_RARP; 570 571 drop_unlock: 572 /* Show's over. Nothing to see here. */ 573 spin_unlock(&ic_recv_lock); 574 575 drop: 576 /* Throw the packet out. */ 577 kfree_skb(skb); 578 return 0; 579 } 580 581 582 /* 583 * Send RARP request packet over a single interface. 584 */ 585 static void __init ic_rarp_send_if(struct ic_device *d) 586 { 587 struct net_device *dev = d->dev; 588 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 589 dev->dev_addr, dev->dev_addr); 590 } 591 #endif 592 593 /* 594 * Predefine Nameservers 595 */ 596 static inline void __init ic_nameservers_predef(void) 597 { 598 int i; 599 600 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 601 ic_nameservers[i] = NONE; 602 } 603 604 /* Predefine NTP servers */ 605 static inline void __init ic_ntp_servers_predef(void) 606 { 607 int i; 608 609 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) 610 ic_ntp_servers[i] = NONE; 611 } 612 613 /* 614 * DHCP/BOOTP support. 615 */ 616 617 #ifdef IPCONFIG_BOOTP 618 619 struct bootp_pkt { /* BOOTP packet format */ 620 struct iphdr iph; /* IP header */ 621 struct udphdr udph; /* UDP header */ 622 u8 op; /* 1=request, 2=reply */ 623 u8 htype; /* HW address type */ 624 u8 hlen; /* HW address length */ 625 u8 hops; /* Used only by gateways */ 626 __be32 xid; /* Transaction ID */ 627 __be16 secs; /* Seconds since we started */ 628 __be16 flags; /* Just what it says */ 629 __be32 client_ip; /* Client's IP address if known */ 630 __be32 your_ip; /* Assigned IP address */ 631 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 632 __be32 relay_ip; /* IP address of BOOTP relay */ 633 u8 hw_addr[16]; /* Client's HW address */ 634 u8 serv_name[64]; /* Server host name */ 635 u8 boot_file[128]; /* Name of boot file */ 636 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 637 }; 638 639 /* packet ops */ 640 #define BOOTP_REQUEST 1 641 #define BOOTP_REPLY 2 642 643 /* DHCP message types */ 644 #define DHCPDISCOVER 1 645 #define DHCPOFFER 2 646 #define DHCPREQUEST 3 647 #define DHCPDECLINE 4 648 #define DHCPACK 5 649 #define DHCPNAK 6 650 #define DHCPRELEASE 7 651 #define DHCPINFORM 8 652 653 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 654 655 static struct packet_type bootp_packet_type __initdata = { 656 .type = cpu_to_be16(ETH_P_IP), 657 .func = ic_bootp_recv, 658 }; 659 660 /* 661 * Initialize DHCP/BOOTP extension fields in the request. 662 */ 663 664 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 665 666 #ifdef IPCONFIG_DHCP 667 668 static void __init 669 ic_dhcp_init_options(u8 *options, struct ic_device *d) 670 { 671 u8 mt = ((ic_servaddr == NONE) 672 ? DHCPDISCOVER : DHCPREQUEST); 673 u8 *e = options; 674 int len; 675 676 pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name); 677 678 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 679 e += 4; 680 681 *e++ = 53; /* DHCP message type */ 682 *e++ = 1; 683 *e++ = mt; 684 685 if (mt == DHCPREQUEST) { 686 *e++ = 54; /* Server ID (IP address) */ 687 *e++ = 4; 688 memcpy(e, &ic_servaddr, 4); 689 e += 4; 690 691 *e++ = 50; /* Requested IP address */ 692 *e++ = 4; 693 memcpy(e, &ic_myaddr, 4); 694 e += 4; 695 } 696 697 /* always? */ 698 { 699 static const u8 ic_req_params[] = { 700 1, /* Subnet mask */ 701 3, /* Default gateway */ 702 6, /* DNS server */ 703 12, /* Host name */ 704 15, /* Domain name */ 705 17, /* Boot path */ 706 26, /* MTU */ 707 40, /* NIS domain name */ 708 42, /* NTP servers */ 709 }; 710 711 *e++ = 55; /* Parameter request list */ 712 *e++ = sizeof(ic_req_params); 713 memcpy(e, ic_req_params, sizeof(ic_req_params)); 714 e += sizeof(ic_req_params); 715 716 if (ic_host_name_set) { 717 *e++ = 12; /* host-name */ 718 len = strlen(utsname()->nodename); 719 *e++ = len; 720 memcpy(e, utsname()->nodename, len); 721 e += len; 722 } 723 if (*vendor_class_identifier) { 724 pr_info("DHCP: sending class identifier \"%s\"\n", 725 vendor_class_identifier); 726 *e++ = 60; /* Class-identifier */ 727 len = strlen(vendor_class_identifier); 728 *e++ = len; 729 memcpy(e, vendor_class_identifier, len); 730 e += len; 731 } 732 len = strlen(dhcp_client_identifier + 1); 733 /* the minimum length of identifier is 2, include 1 byte type, 734 * and can not be larger than the length of options 735 */ 736 if (len >= 1 && len < 312 - (e - options) - 1) { 737 *e++ = 61; 738 *e++ = len + 1; 739 memcpy(e, dhcp_client_identifier, len + 1); 740 e += len + 1; 741 } 742 } 743 744 *e++ = 255; /* End of the list */ 745 } 746 747 #endif /* IPCONFIG_DHCP */ 748 749 static void __init ic_bootp_init_ext(u8 *e) 750 { 751 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 752 e += 4; 753 *e++ = 1; /* Subnet mask request */ 754 *e++ = 4; 755 e += 4; 756 *e++ = 3; /* Default gateway request */ 757 *e++ = 4; 758 e += 4; 759 #if CONF_NAMESERVERS_MAX > 0 760 *e++ = 6; /* (DNS) name server request */ 761 *e++ = 4 * CONF_NAMESERVERS_MAX; 762 e += 4 * CONF_NAMESERVERS_MAX; 763 #endif 764 *e++ = 12; /* Host name request */ 765 *e++ = 32; 766 e += 32; 767 *e++ = 40; /* NIS Domain name request */ 768 *e++ = 32; 769 e += 32; 770 *e++ = 17; /* Boot path */ 771 *e++ = 40; 772 e += 40; 773 774 *e++ = 57; /* set extension buffer size for reply */ 775 *e++ = 2; 776 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 777 *e++ = 150; 778 779 *e++ = 255; /* End of the list */ 780 } 781 782 783 /* 784 * Initialize the DHCP/BOOTP mechanism. 785 */ 786 static inline void __init ic_bootp_init(void) 787 { 788 /* Re-initialise all name servers and NTP servers to NONE, in case any 789 * were set via the "ip=" or "nfsaddrs=" kernel command line parameters: 790 * any IP addresses specified there will already have been decoded but 791 * are no longer needed 792 */ 793 ic_nameservers_predef(); 794 ic_ntp_servers_predef(); 795 796 dev_add_pack(&bootp_packet_type); 797 } 798 799 800 /* 801 * DHCP/BOOTP cleanup. 802 */ 803 static inline void __init ic_bootp_cleanup(void) 804 { 805 dev_remove_pack(&bootp_packet_type); 806 } 807 808 809 /* 810 * Send DHCP/BOOTP request to single interface. 811 */ 812 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 813 { 814 struct net_device *dev = d->dev; 815 struct sk_buff *skb; 816 struct bootp_pkt *b; 817 struct iphdr *h; 818 int hlen = LL_RESERVED_SPACE(dev); 819 int tlen = dev->needed_tailroom; 820 821 /* Allocate packet */ 822 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, 823 GFP_KERNEL); 824 if (!skb) 825 return; 826 skb_reserve(skb, hlen); 827 b = skb_put_zero(skb, sizeof(struct bootp_pkt)); 828 829 /* Construct IP header */ 830 skb_reset_network_header(skb); 831 h = ip_hdr(skb); 832 h->version = 4; 833 h->ihl = 5; 834 h->tot_len = htons(sizeof(struct bootp_pkt)); 835 h->frag_off = htons(IP_DF); 836 h->ttl = 64; 837 h->protocol = IPPROTO_UDP; 838 h->daddr = htonl(INADDR_BROADCAST); 839 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 840 841 /* Construct UDP header */ 842 b->udph.source = htons(68); 843 b->udph.dest = htons(67); 844 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 845 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 846 847 /* Construct DHCP/BOOTP header */ 848 b->op = BOOTP_REQUEST; 849 if (dev->type < 256) /* check for false types */ 850 b->htype = dev->type; 851 else if (dev->type == ARPHRD_FDDI) 852 b->htype = ARPHRD_ETHER; 853 else { 854 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type, 855 dev->name); 856 b->htype = dev->type; /* can cause undefined behavior */ 857 } 858 859 /* server_ip and your_ip address are both already zero per RFC2131 */ 860 b->hlen = dev->addr_len; 861 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 862 b->secs = htons(jiffies_diff / HZ); 863 b->xid = d->xid; 864 865 /* add DHCP options or BOOTP extensions */ 866 #ifdef IPCONFIG_DHCP 867 if (ic_proto_enabled & IC_USE_DHCP) 868 ic_dhcp_init_options(b->exten, d); 869 else 870 #endif 871 ic_bootp_init_ext(b->exten); 872 873 /* Chain packet down the line... */ 874 skb->dev = dev; 875 skb->protocol = htons(ETH_P_IP); 876 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 877 dev->broadcast, dev->dev_addr, skb->len) < 0) { 878 kfree_skb(skb); 879 printk("E"); 880 return; 881 } 882 883 if (dev_queue_xmit(skb) < 0) 884 printk("E"); 885 } 886 887 888 /* 889 * Copy BOOTP-supplied string if not already set. 890 */ 891 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 892 { 893 if (!len) 894 return 0; 895 if (len > max-1) 896 len = max-1; 897 memcpy(dest, src, len); 898 dest[len] = '\0'; 899 return 1; 900 } 901 902 903 /* 904 * Process BOOTP extensions. 905 */ 906 static void __init ic_do_bootp_ext(u8 *ext) 907 { 908 u8 servers; 909 int i; 910 __be16 mtu; 911 912 u8 *c; 913 914 pr_debug("DHCP/BOOTP: Got extension %d:", *ext); 915 for (c=ext+2; c<ext+2+ext[1]; c++) 916 pr_debug(" %02x", *c); 917 pr_debug("\n"); 918 919 switch (*ext++) { 920 case 1: /* Subnet mask */ 921 if (ic_netmask == NONE) 922 memcpy(&ic_netmask, ext+1, 4); 923 break; 924 case 3: /* Default gateway */ 925 if (ic_gateway == NONE) 926 memcpy(&ic_gateway, ext+1, 4); 927 break; 928 case 6: /* DNS server */ 929 servers= *ext/4; 930 if (servers > CONF_NAMESERVERS_MAX) 931 servers = CONF_NAMESERVERS_MAX; 932 for (i = 0; i < servers; i++) { 933 if (ic_nameservers[i] == NONE) 934 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 935 } 936 break; 937 case 12: /* Host name */ 938 ic_bootp_string(utsname()->nodename, ext+1, *ext, 939 __NEW_UTS_LEN); 940 ic_host_name_set = 1; 941 break; 942 case 15: /* Domain name (DNS) */ 943 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 944 break; 945 case 17: /* Root path */ 946 if (!root_server_path[0]) 947 ic_bootp_string(root_server_path, ext+1, *ext, 948 sizeof(root_server_path)); 949 break; 950 case 26: /* Interface MTU */ 951 memcpy(&mtu, ext+1, sizeof(mtu)); 952 ic_dev_mtu = ntohs(mtu); 953 break; 954 case 40: /* NIS Domain name (_not_ DNS) */ 955 ic_bootp_string(utsname()->domainname, ext+1, *ext, 956 __NEW_UTS_LEN); 957 break; 958 case 42: /* NTP servers */ 959 servers = *ext / 4; 960 if (servers > CONF_NTP_SERVERS_MAX) 961 servers = CONF_NTP_SERVERS_MAX; 962 for (i = 0; i < servers; i++) { 963 if (ic_ntp_servers[i] == NONE) 964 memcpy(&ic_ntp_servers[i], ext+1+4*i, 4); 965 } 966 break; 967 } 968 } 969 970 971 /* 972 * Receive BOOTP reply. 973 */ 974 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 975 { 976 struct bootp_pkt *b; 977 struct iphdr *h; 978 struct ic_device *d; 979 int len, ext_len; 980 981 if (!net_eq(dev_net(dev), &init_net)) 982 goto drop; 983 984 /* Perform verifications before taking the lock. */ 985 if (skb->pkt_type == PACKET_OTHERHOST) 986 goto drop; 987 988 skb = skb_share_check(skb, GFP_ATOMIC); 989 if (!skb) 990 return NET_RX_DROP; 991 992 if (!pskb_may_pull(skb, 993 sizeof(struct iphdr) + 994 sizeof(struct udphdr))) 995 goto drop; 996 997 b = (struct bootp_pkt *)skb_network_header(skb); 998 h = &b->iph; 999 1000 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 1001 goto drop; 1002 1003 /* Fragments are not supported */ 1004 if (ip_is_fragment(h)) { 1005 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); 1006 goto drop; 1007 } 1008 1009 if (skb->len < ntohs(h->tot_len)) 1010 goto drop; 1011 1012 if (ip_fast_csum((char *) h, h->ihl)) 1013 goto drop; 1014 1015 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 1016 goto drop; 1017 1018 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 1019 goto drop; 1020 1021 len = ntohs(b->udph.len) - sizeof(struct udphdr); 1022 ext_len = len - (sizeof(*b) - 1023 sizeof(struct iphdr) - 1024 sizeof(struct udphdr) - 1025 sizeof(b->exten)); 1026 if (ext_len < 0) 1027 goto drop; 1028 1029 /* Ok the front looks good, make sure we can get at the rest. */ 1030 if (!pskb_may_pull(skb, skb->len)) 1031 goto drop; 1032 1033 b = (struct bootp_pkt *)skb_network_header(skb); 1034 h = &b->iph; 1035 1036 /* One reply at a time, please. */ 1037 spin_lock(&ic_recv_lock); 1038 1039 /* If we already have a reply, just drop the packet */ 1040 if (ic_got_reply) 1041 goto drop_unlock; 1042 1043 /* Find the ic_device that the packet arrived on */ 1044 d = ic_first_dev; 1045 while (d && d->dev != dev) 1046 d = d->next; 1047 if (!d) 1048 goto drop_unlock; /* should never happen */ 1049 1050 /* Is it a reply to our BOOTP request? */ 1051 if (b->op != BOOTP_REPLY || 1052 b->xid != d->xid) { 1053 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n", 1054 d->dev->name, b->op, b->xid); 1055 goto drop_unlock; 1056 } 1057 1058 /* Parse extensions */ 1059 if (ext_len >= 4 && 1060 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1061 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1062 u8 *ext; 1063 1064 #ifdef IPCONFIG_DHCP 1065 if (ic_proto_enabled & IC_USE_DHCP) { 1066 __be32 server_id = NONE; 1067 int mt = 0; 1068 1069 ext = &b->exten[4]; 1070 while (ext < end && *ext != 0xff) { 1071 u8 *opt = ext++; 1072 if (*opt == 0) /* Padding */ 1073 continue; 1074 ext += *ext + 1; 1075 if (ext >= end) 1076 break; 1077 switch (*opt) { 1078 case 53: /* Message type */ 1079 if (opt[1]) 1080 mt = opt[2]; 1081 break; 1082 case 54: /* Server ID (IP address) */ 1083 if (opt[1] >= 4) 1084 memcpy(&server_id, opt + 2, 4); 1085 break; 1086 } 1087 } 1088 1089 pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name); 1090 1091 switch (mt) { 1092 case DHCPOFFER: 1093 /* While in the process of accepting one offer, 1094 * ignore all others. 1095 */ 1096 if (ic_myaddr != NONE) 1097 goto drop_unlock; 1098 1099 /* Let's accept that offer. */ 1100 ic_myaddr = b->your_ip; 1101 ic_servaddr = server_id; 1102 pr_debug("DHCP: Offered address %pI4 by server %pI4\n", 1103 &ic_myaddr, &b->iph.saddr); 1104 /* The DHCP indicated server address takes 1105 * precedence over the bootp header one if 1106 * they are different. 1107 */ 1108 if ((server_id != NONE) && 1109 (b->server_ip != server_id)) 1110 b->server_ip = ic_servaddr; 1111 break; 1112 1113 case DHCPACK: 1114 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1115 goto drop_unlock; 1116 1117 /* Yeah! */ 1118 break; 1119 1120 default: 1121 /* Urque. Forget it*/ 1122 ic_myaddr = NONE; 1123 ic_servaddr = NONE; 1124 goto drop_unlock; 1125 } 1126 1127 ic_dhcp_msgtype = mt; 1128 1129 } 1130 #endif /* IPCONFIG_DHCP */ 1131 1132 ext = &b->exten[4]; 1133 while (ext < end && *ext != 0xff) { 1134 u8 *opt = ext++; 1135 if (*opt == 0) /* Padding */ 1136 continue; 1137 ext += *ext + 1; 1138 if (ext < end) 1139 ic_do_bootp_ext(opt); 1140 } 1141 } 1142 1143 /* We have a winner! */ 1144 ic_dev = d; 1145 ic_myaddr = b->your_ip; 1146 ic_servaddr = b->server_ip; 1147 ic_addrservaddr = b->iph.saddr; 1148 if (ic_gateway == NONE && b->relay_ip) 1149 ic_gateway = b->relay_ip; 1150 if (ic_nameservers[0] == NONE) 1151 ic_nameservers[0] = ic_servaddr; 1152 ic_got_reply = IC_BOOTP; 1153 1154 drop_unlock: 1155 /* Show's over. Nothing to see here. */ 1156 spin_unlock(&ic_recv_lock); 1157 1158 drop: 1159 /* Throw the packet out. */ 1160 kfree_skb(skb); 1161 1162 return 0; 1163 } 1164 1165 1166 #endif 1167 1168 1169 /* 1170 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1171 */ 1172 1173 #ifdef IPCONFIG_DYNAMIC 1174 1175 static int __init ic_dynamic(void) 1176 { 1177 int retries; 1178 struct ic_device *d; 1179 unsigned long start_jiffies, timeout, jiff; 1180 int do_bootp = ic_proto_have_if & IC_BOOTP; 1181 int do_rarp = ic_proto_have_if & IC_RARP; 1182 1183 /* 1184 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1185 * This routine gets only called when some pieces of information 1186 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1187 */ 1188 if (!ic_proto_enabled) { 1189 pr_err("IP-Config: Incomplete network configuration information\n"); 1190 return -1; 1191 } 1192 1193 #ifdef IPCONFIG_BOOTP 1194 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1195 pr_err("DHCP/BOOTP: No suitable device found\n"); 1196 #endif 1197 #ifdef IPCONFIG_RARP 1198 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1199 pr_err("RARP: No suitable device found\n"); 1200 #endif 1201 1202 if (!ic_proto_have_if) 1203 /* Error message already printed */ 1204 return -1; 1205 1206 /* 1207 * Setup protocols 1208 */ 1209 #ifdef IPCONFIG_BOOTP 1210 if (do_bootp) 1211 ic_bootp_init(); 1212 #endif 1213 #ifdef IPCONFIG_RARP 1214 if (do_rarp) 1215 ic_rarp_init(); 1216 #endif 1217 1218 /* 1219 * Send requests and wait, until we get an answer. This loop 1220 * seems to be a terrible waste of CPU time, but actually there is 1221 * only one process running at all, so we don't need to use any 1222 * scheduler functions. 1223 * [Actually we could now, but the nothing else running note still 1224 * applies.. - AC] 1225 */ 1226 pr_notice("Sending %s%s%s requests .", 1227 do_bootp 1228 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1229 (do_bootp && do_rarp) ? " and " : "", 1230 do_rarp ? "RARP" : ""); 1231 1232 start_jiffies = jiffies; 1233 d = ic_first_dev; 1234 retries = CONF_SEND_RETRIES; 1235 get_random_bytes(&timeout, sizeof(timeout)); 1236 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); 1237 for (;;) { 1238 #ifdef IPCONFIG_BOOTP 1239 if (do_bootp && (d->able & IC_BOOTP)) 1240 ic_bootp_send_if(d, jiffies - start_jiffies); 1241 #endif 1242 #ifdef IPCONFIG_RARP 1243 if (do_rarp && (d->able & IC_RARP)) 1244 ic_rarp_send_if(d); 1245 #endif 1246 1247 if (!d->next) { 1248 jiff = jiffies + timeout; 1249 while (time_before(jiffies, jiff) && !ic_got_reply) 1250 schedule_timeout_uninterruptible(1); 1251 } 1252 #ifdef IPCONFIG_DHCP 1253 /* DHCP isn't done until we get a DHCPACK. */ 1254 if ((ic_got_reply & IC_BOOTP) && 1255 (ic_proto_enabled & IC_USE_DHCP) && 1256 ic_dhcp_msgtype != DHCPACK) { 1257 ic_got_reply = 0; 1258 /* continue on device that got the reply */ 1259 d = ic_dev; 1260 pr_cont(","); 1261 continue; 1262 } 1263 #endif /* IPCONFIG_DHCP */ 1264 1265 if (ic_got_reply) { 1266 pr_cont(" OK\n"); 1267 break; 1268 } 1269 1270 if ((d = d->next)) 1271 continue; 1272 1273 if (! --retries) { 1274 pr_cont(" timed out!\n"); 1275 break; 1276 } 1277 1278 d = ic_first_dev; 1279 1280 timeout = timeout CONF_TIMEOUT_MULT; 1281 if (timeout > CONF_TIMEOUT_MAX) 1282 timeout = CONF_TIMEOUT_MAX; 1283 1284 pr_cont("."); 1285 } 1286 1287 #ifdef IPCONFIG_BOOTP 1288 if (do_bootp) 1289 ic_bootp_cleanup(); 1290 #endif 1291 #ifdef IPCONFIG_RARP 1292 if (do_rarp) 1293 ic_rarp_cleanup(); 1294 #endif 1295 1296 if (!ic_got_reply) { 1297 ic_myaddr = NONE; 1298 return -1; 1299 } 1300 1301 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n", 1302 ((ic_got_reply & IC_RARP) ? "RARP" 1303 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1304 &ic_addrservaddr, &ic_myaddr); 1305 1306 return 0; 1307 } 1308 1309 #endif /* IPCONFIG_DYNAMIC */ 1310 1311 #ifdef CONFIG_PROC_FS 1312 /* proc_dir_entry for /proc/net/ipconfig */ 1313 static struct proc_dir_entry *ipconfig_dir; 1314 1315 /* Name servers: */ 1316 static int pnp_seq_show(struct seq_file *seq, void *v) 1317 { 1318 int i; 1319 1320 if (ic_proto_used & IC_PROTO) 1321 seq_printf(seq, "#PROTO: %s\n", 1322 (ic_proto_used & IC_RARP) ? "RARP" 1323 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1324 else 1325 seq_puts(seq, "#MANUAL\n"); 1326 1327 if (ic_domain[0]) 1328 seq_printf(seq, 1329 "domain %s\n", ic_domain); 1330 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1331 if (ic_nameservers[i] != NONE) 1332 seq_printf(seq, "nameserver %pI4\n", 1333 &ic_nameservers[i]); 1334 } 1335 if (ic_servaddr != NONE) 1336 seq_printf(seq, "bootserver %pI4\n", 1337 &ic_servaddr); 1338 return 0; 1339 } 1340 1341 /* Create the /proc/net/ipconfig directory */ 1342 static int __init ipconfig_proc_net_init(void) 1343 { 1344 ipconfig_dir = proc_net_mkdir(&init_net, "ipconfig", init_net.proc_net); 1345 if (!ipconfig_dir) 1346 return -ENOMEM; 1347 1348 return 0; 1349 } 1350 1351 /* Create a new file under /proc/net/ipconfig */ 1352 static int ipconfig_proc_net_create(const char *name, 1353 const struct proc_ops *proc_ops) 1354 { 1355 char *pname; 1356 struct proc_dir_entry *p; 1357 1358 if (!ipconfig_dir) 1359 return -ENOMEM; 1360 1361 pname = kasprintf(GFP_KERNEL, "%s%s", "ipconfig/", name); 1362 if (!pname) 1363 return -ENOMEM; 1364 1365 p = proc_create(pname, 0444, init_net.proc_net, proc_ops); 1366 kfree(pname); 1367 if (!p) 1368 return -ENOMEM; 1369 1370 return 0; 1371 } 1372 1373 /* Write NTP server IP addresses to /proc/net/ipconfig/ntp_servers */ 1374 static int ntp_servers_show(struct seq_file *seq, void *v) 1375 { 1376 int i; 1377 1378 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) { 1379 if (ic_ntp_servers[i] != NONE) 1380 seq_printf(seq, "%pI4\n", &ic_ntp_servers[i]); 1381 } 1382 return 0; 1383 } 1384 DEFINE_PROC_SHOW_ATTRIBUTE(ntp_servers); 1385 #endif /* CONFIG_PROC_FS */ 1386 1387 /* 1388 * Extract IP address from the parameter string if needed. Note that we 1389 * need to have root_server_addr set _before_ IPConfig gets called as it 1390 * can override it. 1391 */ 1392 __be32 __init root_nfs_parse_addr(char *name) 1393 { 1394 __be32 addr; 1395 int octets = 0; 1396 char *cp, *cq; 1397 1398 cp = cq = name; 1399 while (octets < 4) { 1400 while (*cp >= '0' && *cp <= '9') 1401 cp++; 1402 if (cp == cq || cp - cq > 3) 1403 break; 1404 if (*cp == '.' || octets == 3) 1405 octets++; 1406 if (octets < 4) 1407 cp++; 1408 cq = cp; 1409 } 1410 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1411 if (*cp == ':') 1412 *cp++ = '\0'; 1413 addr = in_aton(name); 1414 memmove(name, cp, strlen(cp) + 1); 1415 } else 1416 addr = NONE; 1417 1418 return addr; 1419 } 1420 1421 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1422 1423 static int __init wait_for_devices(void) 1424 { 1425 int i; 1426 1427 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1428 struct net_device *dev; 1429 int found = 0; 1430 1431 /* make sure deferred device probes are finished */ 1432 wait_for_device_probe(); 1433 1434 rtnl_lock(); 1435 for_each_netdev(&init_net, dev) { 1436 if (ic_is_init_dev(dev)) { 1437 found = 1; 1438 break; 1439 } 1440 } 1441 rtnl_unlock(); 1442 if (found) 1443 return 0; 1444 ssleep(1); 1445 } 1446 return -ENODEV; 1447 } 1448 1449 /* 1450 * IP Autoconfig dispatcher. 1451 */ 1452 1453 static int __init ip_auto_config(void) 1454 { 1455 __be32 addr; 1456 #ifdef IPCONFIG_DYNAMIC 1457 int retries = CONF_OPEN_RETRIES; 1458 #endif 1459 int err; 1460 unsigned int i, count; 1461 1462 /* Initialise all name servers and NTP servers to NONE (but only if the 1463 * "ip=" or "nfsaddrs=" kernel command line parameters weren't decoded, 1464 * otherwise we'll overwrite the IP addresses specified there) 1465 */ 1466 if (ic_set_manually == 0) { 1467 ic_nameservers_predef(); 1468 ic_ntp_servers_predef(); 1469 } 1470 1471 #ifdef CONFIG_PROC_FS 1472 proc_create_single("pnp", 0444, init_net.proc_net, pnp_seq_show); 1473 1474 if (ipconfig_proc_net_init() == 0) 1475 ipconfig_proc_net_create("ntp_servers", &ntp_servers_proc_ops); 1476 #endif /* CONFIG_PROC_FS */ 1477 1478 if (!ic_enable) 1479 return 0; 1480 1481 pr_debug("IP-Config: Entered.\n"); 1482 #ifdef IPCONFIG_DYNAMIC 1483 try_try_again: 1484 #endif 1485 /* Wait for devices to appear */ 1486 err = wait_for_devices(); 1487 if (err) 1488 return err; 1489 1490 /* Setup all network devices */ 1491 err = ic_open_devs(); 1492 if (err) 1493 return err; 1494 1495 /* Give drivers a chance to settle */ 1496 msleep(CONF_POST_OPEN); 1497 1498 /* 1499 * If the config information is insufficient (e.g., our IP address or 1500 * IP address of the boot server is missing or we have multiple network 1501 * interfaces and no default was set), use BOOTP or RARP to get the 1502 * missing values. 1503 */ 1504 if (ic_myaddr == NONE || 1505 #if defined(CONFIG_ROOT_NFS) || defined(CONFIG_CIFS_ROOT) 1506 (root_server_addr == NONE && 1507 ic_servaddr == NONE && 1508 (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) || 1509 #endif 1510 ic_first_dev->next) { 1511 #ifdef IPCONFIG_DYNAMIC 1512 if (ic_dynamic() < 0) { 1513 ic_close_devs(); 1514 1515 /* 1516 * I don't know why, but sometimes the 1517 * eepro100 driver (at least) gets upset and 1518 * doesn't work the first time it's opened. 1519 * But then if you close it and reopen it, it 1520 * works just fine. So we need to try that at 1521 * least once before giving up. 1522 * 1523 * Also, if the root will be NFS-mounted, we 1524 * have nowhere to go if DHCP fails. So we 1525 * just have to keep trying forever. 1526 * 1527 * -- Chip 1528 */ 1529 #ifdef CONFIG_ROOT_NFS 1530 if (ROOT_DEV == Root_NFS) { 1531 pr_err("IP-Config: Retrying forever (NFS root)...\n"); 1532 goto try_try_again; 1533 } 1534 #endif 1535 #ifdef CONFIG_CIFS_ROOT 1536 if (ROOT_DEV == Root_CIFS) { 1537 pr_err("IP-Config: Retrying forever (CIFS root)...\n"); 1538 goto try_try_again; 1539 } 1540 #endif 1541 1542 if (--retries) { 1543 pr_err("IP-Config: Reopening network devices...\n"); 1544 goto try_try_again; 1545 } 1546 1547 /* Oh, well. At least we tried. */ 1548 pr_err("IP-Config: Auto-configuration of network failed\n"); 1549 return -1; 1550 } 1551 #else /* !DYNAMIC */ 1552 pr_err("IP-Config: Incomplete network configuration information\n"); 1553 ic_close_devs(); 1554 return -1; 1555 #endif /* IPCONFIG_DYNAMIC */ 1556 } else { 1557 /* Device selected manually or only one device -> use it */ 1558 ic_dev = ic_first_dev; 1559 } 1560 1561 addr = root_nfs_parse_addr(root_server_path); 1562 if (root_server_addr == NONE) 1563 root_server_addr = addr; 1564 1565 /* 1566 * Use defaults wherever applicable. 1567 */ 1568 if (ic_defaults() < 0) 1569 return -1; 1570 1571 /* 1572 * Record which protocol was actually used. 1573 */ 1574 #ifdef IPCONFIG_DYNAMIC 1575 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1576 #endif 1577 1578 #ifndef IPCONFIG_SILENT 1579 /* 1580 * Clue in the operator. 1581 */ 1582 pr_info("IP-Config: Complete:\n"); 1583 1584 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", 1585 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr, 1586 &ic_myaddr, &ic_netmask, &ic_gateway); 1587 pr_info(" host=%s, domain=%s, nis-domain=%s\n", 1588 utsname()->nodename, ic_domain, utsname()->domainname); 1589 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", 1590 &ic_servaddr, &root_server_addr, root_server_path); 1591 if (ic_dev_mtu) 1592 pr_cont(", mtu=%d", ic_dev_mtu); 1593 /* Name servers (if any): */ 1594 for (i = 0, count = 0; i < CONF_NAMESERVERS_MAX; i++) { 1595 if (ic_nameservers[i] != NONE) { 1596 if (i == 0) 1597 pr_info(" nameserver%u=%pI4", 1598 i, &ic_nameservers[i]); 1599 else 1600 pr_cont(", nameserver%u=%pI4", 1601 i, &ic_nameservers[i]); 1602 1603 count++; 1604 } 1605 if ((i + 1 == CONF_NAMESERVERS_MAX) && count > 0) 1606 pr_cont("\n"); 1607 } 1608 /* NTP servers (if any): */ 1609 for (i = 0, count = 0; i < CONF_NTP_SERVERS_MAX; i++) { 1610 if (ic_ntp_servers[i] != NONE) { 1611 if (i == 0) 1612 pr_info(" ntpserver%u=%pI4", 1613 i, &ic_ntp_servers[i]); 1614 else 1615 pr_cont(", ntpserver%u=%pI4", 1616 i, &ic_ntp_servers[i]); 1617 1618 count++; 1619 } 1620 if ((i + 1 == CONF_NTP_SERVERS_MAX) && count > 0) 1621 pr_cont("\n"); 1622 } 1623 #endif /* !SILENT */ 1624 1625 /* 1626 * Close all network devices except the device we've 1627 * autoconfigured and set up routes. 1628 */ 1629 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1630 err = -1; 1631 else 1632 err = 0; 1633 1634 ic_close_devs(); 1635 1636 return err; 1637 } 1638 1639 late_initcall(ip_auto_config); 1640 1641 1642 /* 1643 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1644 * command line parameter. See Documentation/admin-guide/nfs/nfsroot.rst. 1645 */ 1646 static int __init ic_proto_name(char *name) 1647 { 1648 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1649 return 1; 1650 } 1651 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1652 return 0; 1653 } 1654 #ifdef CONFIG_IP_PNP_DHCP 1655 else if (!strncmp(name, "dhcp", 4)) { 1656 char *client_id; 1657 1658 ic_proto_enabled &= ~IC_RARP; 1659 client_id = strstr(name, "dhcp,"); 1660 if (client_id) { 1661 char *v; 1662 1663 client_id = client_id + 5; 1664 v = strchr(client_id, ','); 1665 if (!v) 1666 return 1; 1667 *v = 0; 1668 if (kstrtou8(client_id, 0, dhcp_client_identifier)) 1669 pr_debug("DHCP: Invalid client identifier type\n"); 1670 strncpy(dhcp_client_identifier + 1, v + 1, 251); 1671 *v = ','; 1672 } 1673 return 1; 1674 } 1675 #endif 1676 #ifdef CONFIG_IP_PNP_BOOTP 1677 else if (!strcmp(name, "bootp")) { 1678 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1679 return 1; 1680 } 1681 #endif 1682 #ifdef CONFIG_IP_PNP_RARP 1683 else if (!strcmp(name, "rarp")) { 1684 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1685 return 1; 1686 } 1687 #endif 1688 #ifdef IPCONFIG_DYNAMIC 1689 else if (!strcmp(name, "both")) { 1690 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1691 return 1; 1692 } 1693 #endif 1694 return 0; 1695 } 1696 1697 static int __init ip_auto_config_setup(char *addrs) 1698 { 1699 char *cp, *ip, *dp; 1700 int num = 0; 1701 1702 ic_set_manually = 1; 1703 ic_enable = 1; 1704 1705 /* 1706 * If any dhcp, bootp etc options are set, leave autoconfig on 1707 * and skip the below static IP processing. 1708 */ 1709 if (ic_proto_name(addrs)) 1710 return 1; 1711 1712 /* If no static IP is given, turn off autoconfig and bail. */ 1713 if (*addrs == 0 || 1714 strcmp(addrs, "off") == 0 || 1715 strcmp(addrs, "none") == 0) { 1716 ic_enable = 0; 1717 return 1; 1718 } 1719 1720 /* Initialise all name servers and NTP servers to NONE */ 1721 ic_nameservers_predef(); 1722 ic_ntp_servers_predef(); 1723 1724 /* Parse string for static IP assignment. */ 1725 ip = addrs; 1726 while (ip && *ip) { 1727 if ((cp = strchr(ip, ':'))) 1728 *cp++ = '\0'; 1729 if (strlen(ip) > 0) { 1730 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip); 1731 switch (num) { 1732 case 0: 1733 if ((ic_myaddr = in_aton(ip)) == ANY) 1734 ic_myaddr = NONE; 1735 break; 1736 case 1: 1737 if ((ic_servaddr = in_aton(ip)) == ANY) 1738 ic_servaddr = NONE; 1739 break; 1740 case 2: 1741 if ((ic_gateway = in_aton(ip)) == ANY) 1742 ic_gateway = NONE; 1743 break; 1744 case 3: 1745 if ((ic_netmask = in_aton(ip)) == ANY) 1746 ic_netmask = NONE; 1747 break; 1748 case 4: 1749 if ((dp = strchr(ip, '.'))) { 1750 *dp++ = '\0'; 1751 strlcpy(utsname()->domainname, dp, 1752 sizeof(utsname()->domainname)); 1753 } 1754 strlcpy(utsname()->nodename, ip, 1755 sizeof(utsname()->nodename)); 1756 ic_host_name_set = 1; 1757 break; 1758 case 5: 1759 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1760 break; 1761 case 6: 1762 if (ic_proto_name(ip) == 0 && 1763 ic_myaddr == NONE) { 1764 ic_enable = 0; 1765 } 1766 break; 1767 case 7: 1768 if (CONF_NAMESERVERS_MAX >= 1) { 1769 ic_nameservers[0] = in_aton(ip); 1770 if (ic_nameservers[0] == ANY) 1771 ic_nameservers[0] = NONE; 1772 } 1773 break; 1774 case 8: 1775 if (CONF_NAMESERVERS_MAX >= 2) { 1776 ic_nameservers[1] = in_aton(ip); 1777 if (ic_nameservers[1] == ANY) 1778 ic_nameservers[1] = NONE; 1779 } 1780 break; 1781 case 9: 1782 if (CONF_NTP_SERVERS_MAX >= 1) { 1783 ic_ntp_servers[0] = in_aton(ip); 1784 if (ic_ntp_servers[0] == ANY) 1785 ic_ntp_servers[0] = NONE; 1786 } 1787 break; 1788 } 1789 } 1790 ip = cp; 1791 num++; 1792 } 1793 1794 return 1; 1795 } 1796 __setup("ip=", ip_auto_config_setup); 1797 1798 static int __init nfsaddrs_config_setup(char *addrs) 1799 { 1800 return ip_auto_config_setup(addrs); 1801 } 1802 __setup("nfsaddrs=", nfsaddrs_config_setup); 1803 1804 static int __init vendor_class_identifier_setup(char *addrs) 1805 { 1806 if (strlcpy(vendor_class_identifier, addrs, 1807 sizeof(vendor_class_identifier)) 1808 >= sizeof(vendor_class_identifier)) 1809 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n", 1810 vendor_class_identifier); 1811 return 1; 1812 } 1813 __setup("dhcpclass=", vendor_class_identifier_setup); 1814 1815 static int __init set_carrier_timeout(char *str) 1816 { 1817 ssize_t ret; 1818 1819 if (!str) 1820 return 0; 1821 1822 ret = kstrtouint(str, 0, &carrier_timeout); 1823 if (ret) 1824 return 0; 1825 1826 return 1; 1827 } 1828 __setup("carrier_timeout=", set_carrier_timeout); 1829