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 /* Devices with a complex topology like SFP ethernet interfaces needs 266 * the rtnl_lock at init. The carrier wait-loop must therefore run 267 * without holding it. 268 */ 269 rtnl_unlock(); 270 271 /* no point in waiting if we could not bring up at least one device */ 272 if (!ic_first_dev) 273 goto have_carrier; 274 275 /* wait for a carrier on at least one device */ 276 start = jiffies; 277 next_msg = start + msecs_to_jiffies(20000); 278 while (time_before(jiffies, start + 279 msecs_to_jiffies(carrier_timeout * 1000))) { 280 int wait, elapsed; 281 282 rtnl_lock(); 283 for_each_netdev(&init_net, dev) 284 if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) { 285 rtnl_unlock(); 286 goto have_carrier; 287 } 288 rtnl_unlock(); 289 290 msleep(1); 291 292 if (time_before(jiffies, next_msg)) 293 continue; 294 295 elapsed = jiffies_to_msecs(jiffies - start); 296 wait = (carrier_timeout * 1000 - elapsed + 500) / 1000; 297 pr_info("Waiting up to %d more seconds for network.\n", wait); 298 next_msg = jiffies + msecs_to_jiffies(20000); 299 } 300 have_carrier: 301 302 *last = NULL; 303 304 if (!ic_first_dev) { 305 if (user_dev_name[0]) 306 pr_err("IP-Config: Device `%s' not found\n", 307 user_dev_name); 308 else 309 pr_err("IP-Config: No network devices available\n"); 310 return -ENODEV; 311 } 312 return 0; 313 } 314 315 /* Close all network interfaces except the one we've autoconfigured, and its 316 * lowers, in case it's a stacked virtual interface. 317 */ 318 static void __init ic_close_devs(void) 319 { 320 struct net_device *selected_dev = ic_dev ? ic_dev->dev : NULL; 321 struct ic_device *d, *next; 322 struct net_device *dev; 323 324 rtnl_lock(); 325 next = ic_first_dev; 326 while ((d = next)) { 327 bool bring_down = (d != ic_dev); 328 struct net_device *lower; 329 struct list_head *iter; 330 331 next = d->next; 332 dev = d->dev; 333 334 if (selected_dev) { 335 netdev_for_each_lower_dev(selected_dev, lower, iter) { 336 if (dev == lower) { 337 bring_down = false; 338 break; 339 } 340 } 341 } 342 if (bring_down) { 343 pr_debug("IP-Config: Downing %s\n", dev->name); 344 dev_change_flags(dev, d->flags, NULL); 345 } 346 kfree(d); 347 } 348 rtnl_unlock(); 349 } 350 351 /* 352 * Interface to various network functions. 353 */ 354 355 static inline void 356 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 357 { 358 sin->sin_family = AF_INET; 359 sin->sin_addr.s_addr = addr; 360 sin->sin_port = port; 361 } 362 363 /* 364 * Set up interface addresses and routes. 365 */ 366 367 static int __init ic_setup_if(void) 368 { 369 struct ifreq ir; 370 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 371 int err; 372 373 memset(&ir, 0, sizeof(ir)); 374 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name); 375 set_sockaddr(sin, ic_myaddr, 0); 376 if ((err = devinet_ioctl(&init_net, SIOCSIFADDR, &ir)) < 0) { 377 pr_err("IP-Config: Unable to set interface address (%d)\n", 378 err); 379 return -1; 380 } 381 set_sockaddr(sin, ic_netmask, 0); 382 if ((err = devinet_ioctl(&init_net, SIOCSIFNETMASK, &ir)) < 0) { 383 pr_err("IP-Config: Unable to set interface netmask (%d)\n", 384 err); 385 return -1; 386 } 387 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 388 if ((err = devinet_ioctl(&init_net, SIOCSIFBRDADDR, &ir)) < 0) { 389 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n", 390 err); 391 return -1; 392 } 393 /* Handle the case where we need non-standard MTU on the boot link (a network 394 * using jumbo frames, for instance). If we can't set the mtu, don't error 395 * out, we'll try to muddle along. 396 */ 397 if (ic_dev_mtu != 0) { 398 rtnl_lock(); 399 if ((err = dev_set_mtu(ic_dev->dev, ic_dev_mtu)) < 0) 400 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", 401 ic_dev_mtu, err); 402 rtnl_unlock(); 403 } 404 return 0; 405 } 406 407 static int __init ic_setup_routes(void) 408 { 409 /* No need to setup device routes, only the default route... */ 410 411 if (ic_gateway != NONE) { 412 struct rtentry rm; 413 int err; 414 415 memset(&rm, 0, sizeof(rm)); 416 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 417 pr_err("IP-Config: Gateway not on directly connected network\n"); 418 return -1; 419 } 420 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 421 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 422 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 423 rm.rt_flags = RTF_UP | RTF_GATEWAY; 424 if ((err = ip_rt_ioctl(&init_net, SIOCADDRT, &rm)) < 0) { 425 pr_err("IP-Config: Cannot add default route (%d)\n", 426 err); 427 return -1; 428 } 429 } 430 431 return 0; 432 } 433 434 /* 435 * Fill in default values for all missing parameters. 436 */ 437 438 static int __init ic_defaults(void) 439 { 440 /* 441 * At this point we have no userspace running so need not 442 * claim locks on system_utsname 443 */ 444 445 if (!ic_host_name_set) 446 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 447 448 if (root_server_addr == NONE) 449 root_server_addr = ic_servaddr; 450 451 if (ic_netmask == NONE) { 452 if (IN_CLASSA(ntohl(ic_myaddr))) 453 ic_netmask = htonl(IN_CLASSA_NET); 454 else if (IN_CLASSB(ntohl(ic_myaddr))) 455 ic_netmask = htonl(IN_CLASSB_NET); 456 else if (IN_CLASSC(ntohl(ic_myaddr))) 457 ic_netmask = htonl(IN_CLASSC_NET); 458 else if (IN_CLASSE(ntohl(ic_myaddr))) 459 ic_netmask = htonl(IN_CLASSE_NET); 460 else { 461 pr_err("IP-Config: Unable to guess netmask for address %pI4\n", 462 &ic_myaddr); 463 return -1; 464 } 465 pr_notice("IP-Config: Guessing netmask %pI4\n", 466 &ic_netmask); 467 } 468 469 return 0; 470 } 471 472 /* 473 * RARP support. 474 */ 475 476 #ifdef IPCONFIG_RARP 477 478 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 479 480 static struct packet_type rarp_packet_type __initdata = { 481 .type = cpu_to_be16(ETH_P_RARP), 482 .func = ic_rarp_recv, 483 }; 484 485 static inline void __init ic_rarp_init(void) 486 { 487 dev_add_pack(&rarp_packet_type); 488 } 489 490 static inline void __init ic_rarp_cleanup(void) 491 { 492 dev_remove_pack(&rarp_packet_type); 493 } 494 495 /* 496 * Process received RARP packet. 497 */ 498 static int __init 499 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 500 { 501 struct arphdr *rarp; 502 unsigned char *rarp_ptr; 503 __be32 sip, tip; 504 unsigned char *tha; /* t for "target" */ 505 struct ic_device *d; 506 507 if (!net_eq(dev_net(dev), &init_net)) 508 goto drop; 509 510 skb = skb_share_check(skb, GFP_ATOMIC); 511 if (!skb) 512 return NET_RX_DROP; 513 514 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 515 goto drop; 516 517 /* Basic sanity checks can be done without the lock. */ 518 rarp = (struct arphdr *)skb_transport_header(skb); 519 520 /* If this test doesn't pass, it's not IP, or we should 521 * ignore it anyway. 522 */ 523 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 524 goto drop; 525 526 /* If it's not a RARP reply, delete it. */ 527 if (rarp->ar_op != htons(ARPOP_RREPLY)) 528 goto drop; 529 530 /* If it's not Ethernet, delete it. */ 531 if (rarp->ar_pro != htons(ETH_P_IP)) 532 goto drop; 533 534 if (!pskb_may_pull(skb, arp_hdr_len(dev))) 535 goto drop; 536 537 /* OK, it is all there and looks valid, process... */ 538 rarp = (struct arphdr *)skb_transport_header(skb); 539 rarp_ptr = (unsigned char *) (rarp + 1); 540 541 /* One reply at a time, please. */ 542 spin_lock(&ic_recv_lock); 543 544 /* If we already have a reply, just drop the packet */ 545 if (ic_got_reply) 546 goto drop_unlock; 547 548 /* Find the ic_device that the packet arrived on */ 549 d = ic_first_dev; 550 while (d && d->dev != dev) 551 d = d->next; 552 if (!d) 553 goto drop_unlock; /* should never happen */ 554 555 /* Extract variable-width fields */ 556 rarp_ptr += dev->addr_len; 557 memcpy(&sip, rarp_ptr, 4); 558 rarp_ptr += 4; 559 tha = rarp_ptr; 560 rarp_ptr += dev->addr_len; 561 memcpy(&tip, rarp_ptr, 4); 562 563 /* Discard packets which are not meant for us. */ 564 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 565 goto drop_unlock; 566 567 /* Discard packets which are not from specified server. */ 568 if (ic_servaddr != NONE && ic_servaddr != sip) 569 goto drop_unlock; 570 571 /* We have a winner! */ 572 ic_dev = d; 573 if (ic_myaddr == NONE) 574 ic_myaddr = tip; 575 ic_servaddr = sip; 576 ic_addrservaddr = sip; 577 ic_got_reply = IC_RARP; 578 579 drop_unlock: 580 /* Show's over. Nothing to see here. */ 581 spin_unlock(&ic_recv_lock); 582 583 drop: 584 /* Throw the packet out. */ 585 kfree_skb(skb); 586 return 0; 587 } 588 589 590 /* 591 * Send RARP request packet over a single interface. 592 */ 593 static void __init ic_rarp_send_if(struct ic_device *d) 594 { 595 struct net_device *dev = d->dev; 596 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 597 dev->dev_addr, dev->dev_addr); 598 } 599 #endif 600 601 /* 602 * Predefine Nameservers 603 */ 604 static inline void __init ic_nameservers_predef(void) 605 { 606 int i; 607 608 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 609 ic_nameservers[i] = NONE; 610 } 611 612 /* Predefine NTP servers */ 613 static inline void __init ic_ntp_servers_predef(void) 614 { 615 int i; 616 617 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) 618 ic_ntp_servers[i] = NONE; 619 } 620 621 /* 622 * DHCP/BOOTP support. 623 */ 624 625 #ifdef IPCONFIG_BOOTP 626 627 struct bootp_pkt { /* BOOTP packet format */ 628 struct iphdr iph; /* IP header */ 629 struct udphdr udph; /* UDP header */ 630 u8 op; /* 1=request, 2=reply */ 631 u8 htype; /* HW address type */ 632 u8 hlen; /* HW address length */ 633 u8 hops; /* Used only by gateways */ 634 __be32 xid; /* Transaction ID */ 635 __be16 secs; /* Seconds since we started */ 636 __be16 flags; /* Just what it says */ 637 __be32 client_ip; /* Client's IP address if known */ 638 __be32 your_ip; /* Assigned IP address */ 639 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 640 __be32 relay_ip; /* IP address of BOOTP relay */ 641 u8 hw_addr[16]; /* Client's HW address */ 642 u8 serv_name[64]; /* Server host name */ 643 u8 boot_file[128]; /* Name of boot file */ 644 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 645 }; 646 647 /* packet ops */ 648 #define BOOTP_REQUEST 1 649 #define BOOTP_REPLY 2 650 651 /* DHCP message types */ 652 #define DHCPDISCOVER 1 653 #define DHCPOFFER 2 654 #define DHCPREQUEST 3 655 #define DHCPDECLINE 4 656 #define DHCPACK 5 657 #define DHCPNAK 6 658 #define DHCPRELEASE 7 659 #define DHCPINFORM 8 660 661 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 662 663 static struct packet_type bootp_packet_type __initdata = { 664 .type = cpu_to_be16(ETH_P_IP), 665 .func = ic_bootp_recv, 666 }; 667 668 /* 669 * Initialize DHCP/BOOTP extension fields in the request. 670 */ 671 672 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 673 674 #ifdef IPCONFIG_DHCP 675 676 static void __init 677 ic_dhcp_init_options(u8 *options, struct ic_device *d) 678 { 679 u8 mt = ((ic_servaddr == NONE) 680 ? DHCPDISCOVER : DHCPREQUEST); 681 u8 *e = options; 682 int len; 683 684 pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name); 685 686 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 687 e += 4; 688 689 *e++ = 53; /* DHCP message type */ 690 *e++ = 1; 691 *e++ = mt; 692 693 if (mt == DHCPREQUEST) { 694 *e++ = 54; /* Server ID (IP address) */ 695 *e++ = 4; 696 memcpy(e, &ic_servaddr, 4); 697 e += 4; 698 699 *e++ = 50; /* Requested IP address */ 700 *e++ = 4; 701 memcpy(e, &ic_myaddr, 4); 702 e += 4; 703 } 704 705 /* always? */ 706 { 707 static const u8 ic_req_params[] = { 708 1, /* Subnet mask */ 709 3, /* Default gateway */ 710 6, /* DNS server */ 711 12, /* Host name */ 712 15, /* Domain name */ 713 17, /* Boot path */ 714 26, /* MTU */ 715 40, /* NIS domain name */ 716 42, /* NTP servers */ 717 }; 718 719 *e++ = 55; /* Parameter request list */ 720 *e++ = sizeof(ic_req_params); 721 memcpy(e, ic_req_params, sizeof(ic_req_params)); 722 e += sizeof(ic_req_params); 723 724 if (ic_host_name_set) { 725 *e++ = 12; /* host-name */ 726 len = strlen(utsname()->nodename); 727 *e++ = len; 728 memcpy(e, utsname()->nodename, len); 729 e += len; 730 } 731 if (*vendor_class_identifier) { 732 pr_info("DHCP: sending class identifier \"%s\"\n", 733 vendor_class_identifier); 734 *e++ = 60; /* Class-identifier */ 735 len = strlen(vendor_class_identifier); 736 *e++ = len; 737 memcpy(e, vendor_class_identifier, len); 738 e += len; 739 } 740 len = strlen(dhcp_client_identifier + 1); 741 /* the minimum length of identifier is 2, include 1 byte type, 742 * and can not be larger than the length of options 743 */ 744 if (len >= 1 && len < 312 - (e - options) - 1) { 745 *e++ = 61; 746 *e++ = len + 1; 747 memcpy(e, dhcp_client_identifier, len + 1); 748 e += len + 1; 749 } 750 } 751 752 *e++ = 255; /* End of the list */ 753 } 754 755 #endif /* IPCONFIG_DHCP */ 756 757 static void __init ic_bootp_init_ext(u8 *e) 758 { 759 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 760 e += 4; 761 *e++ = 1; /* Subnet mask request */ 762 *e++ = 4; 763 e += 4; 764 *e++ = 3; /* Default gateway request */ 765 *e++ = 4; 766 e += 4; 767 #if CONF_NAMESERVERS_MAX > 0 768 *e++ = 6; /* (DNS) name server request */ 769 *e++ = 4 * CONF_NAMESERVERS_MAX; 770 e += 4 * CONF_NAMESERVERS_MAX; 771 #endif 772 *e++ = 12; /* Host name request */ 773 *e++ = 32; 774 e += 32; 775 *e++ = 40; /* NIS Domain name request */ 776 *e++ = 32; 777 e += 32; 778 *e++ = 17; /* Boot path */ 779 *e++ = 40; 780 e += 40; 781 782 *e++ = 57; /* set extension buffer size for reply */ 783 *e++ = 2; 784 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 785 *e++ = 150; 786 787 *e++ = 255; /* End of the list */ 788 } 789 790 791 /* 792 * Initialize the DHCP/BOOTP mechanism. 793 */ 794 static inline void __init ic_bootp_init(void) 795 { 796 /* Re-initialise all name servers and NTP servers to NONE, in case any 797 * were set via the "ip=" or "nfsaddrs=" kernel command line parameters: 798 * any IP addresses specified there will already have been decoded but 799 * are no longer needed 800 */ 801 ic_nameservers_predef(); 802 ic_ntp_servers_predef(); 803 804 dev_add_pack(&bootp_packet_type); 805 } 806 807 808 /* 809 * DHCP/BOOTP cleanup. 810 */ 811 static inline void __init ic_bootp_cleanup(void) 812 { 813 dev_remove_pack(&bootp_packet_type); 814 } 815 816 817 /* 818 * Send DHCP/BOOTP request to single interface. 819 */ 820 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 821 { 822 struct net_device *dev = d->dev; 823 struct sk_buff *skb; 824 struct bootp_pkt *b; 825 struct iphdr *h; 826 int hlen = LL_RESERVED_SPACE(dev); 827 int tlen = dev->needed_tailroom; 828 829 /* Allocate packet */ 830 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, 831 GFP_KERNEL); 832 if (!skb) 833 return; 834 skb_reserve(skb, hlen); 835 b = skb_put_zero(skb, sizeof(struct bootp_pkt)); 836 837 /* Construct IP header */ 838 skb_reset_network_header(skb); 839 h = ip_hdr(skb); 840 h->version = 4; 841 h->ihl = 5; 842 h->tot_len = htons(sizeof(struct bootp_pkt)); 843 h->frag_off = htons(IP_DF); 844 h->ttl = 64; 845 h->protocol = IPPROTO_UDP; 846 h->daddr = htonl(INADDR_BROADCAST); 847 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 848 849 /* Construct UDP header */ 850 b->udph.source = htons(68); 851 b->udph.dest = htons(67); 852 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 853 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 854 855 /* Construct DHCP/BOOTP header */ 856 b->op = BOOTP_REQUEST; 857 if (dev->type < 256) /* check for false types */ 858 b->htype = dev->type; 859 else if (dev->type == ARPHRD_FDDI) 860 b->htype = ARPHRD_ETHER; 861 else { 862 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type, 863 dev->name); 864 b->htype = dev->type; /* can cause undefined behavior */ 865 } 866 867 /* server_ip and your_ip address are both already zero per RFC2131 */ 868 b->hlen = dev->addr_len; 869 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 870 b->secs = htons(jiffies_diff / HZ); 871 b->xid = d->xid; 872 873 /* add DHCP options or BOOTP extensions */ 874 #ifdef IPCONFIG_DHCP 875 if (ic_proto_enabled & IC_USE_DHCP) 876 ic_dhcp_init_options(b->exten, d); 877 else 878 #endif 879 ic_bootp_init_ext(b->exten); 880 881 /* Chain packet down the line... */ 882 skb->dev = dev; 883 skb->protocol = htons(ETH_P_IP); 884 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 885 dev->broadcast, dev->dev_addr, skb->len) < 0) { 886 kfree_skb(skb); 887 printk("E"); 888 return; 889 } 890 891 if (dev_queue_xmit(skb) < 0) 892 printk("E"); 893 } 894 895 896 /* 897 * Copy BOOTP-supplied string 898 */ 899 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 900 { 901 if (!len) 902 return 0; 903 if (len > max-1) 904 len = max-1; 905 memcpy(dest, src, len); 906 dest[len] = '\0'; 907 return 1; 908 } 909 910 911 /* 912 * Process BOOTP extensions. 913 */ 914 static void __init ic_do_bootp_ext(u8 *ext) 915 { 916 u8 servers; 917 int i; 918 __be16 mtu; 919 920 u8 *c; 921 922 pr_debug("DHCP/BOOTP: Got extension %d:", *ext); 923 for (c=ext+2; c<ext+2+ext[1]; c++) 924 pr_debug(" %02x", *c); 925 pr_debug("\n"); 926 927 switch (*ext++) { 928 case 1: /* Subnet mask */ 929 if (ic_netmask == NONE) 930 memcpy(&ic_netmask, ext+1, 4); 931 break; 932 case 3: /* Default gateway */ 933 if (ic_gateway == NONE) 934 memcpy(&ic_gateway, ext+1, 4); 935 break; 936 case 6: /* DNS server */ 937 servers= *ext/4; 938 if (servers > CONF_NAMESERVERS_MAX) 939 servers = CONF_NAMESERVERS_MAX; 940 for (i = 0; i < servers; i++) { 941 if (ic_nameservers[i] == NONE) 942 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 943 } 944 break; 945 case 12: /* Host name */ 946 if (!ic_host_name_set) { 947 ic_bootp_string(utsname()->nodename, ext+1, *ext, 948 __NEW_UTS_LEN); 949 ic_host_name_set = 1; 950 } 951 break; 952 case 15: /* Domain name (DNS) */ 953 if (!ic_domain[0]) 954 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 955 break; 956 case 17: /* Root path */ 957 if (!root_server_path[0]) 958 ic_bootp_string(root_server_path, ext+1, *ext, 959 sizeof(root_server_path)); 960 break; 961 case 26: /* Interface MTU */ 962 memcpy(&mtu, ext+1, sizeof(mtu)); 963 ic_dev_mtu = ntohs(mtu); 964 break; 965 case 40: /* NIS Domain name (_not_ DNS) */ 966 ic_bootp_string(utsname()->domainname, ext+1, *ext, 967 __NEW_UTS_LEN); 968 break; 969 case 42: /* NTP servers */ 970 servers = *ext / 4; 971 if (servers > CONF_NTP_SERVERS_MAX) 972 servers = CONF_NTP_SERVERS_MAX; 973 for (i = 0; i < servers; i++) { 974 if (ic_ntp_servers[i] == NONE) 975 memcpy(&ic_ntp_servers[i], ext+1+4*i, 4); 976 } 977 break; 978 } 979 } 980 981 982 /* 983 * Receive BOOTP reply. 984 */ 985 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 986 { 987 struct bootp_pkt *b; 988 struct iphdr *h; 989 struct ic_device *d; 990 int len, ext_len; 991 992 if (!net_eq(dev_net(dev), &init_net)) 993 goto drop; 994 995 /* Perform verifications before taking the lock. */ 996 if (skb->pkt_type == PACKET_OTHERHOST) 997 goto drop; 998 999 skb = skb_share_check(skb, GFP_ATOMIC); 1000 if (!skb) 1001 return NET_RX_DROP; 1002 1003 if (!pskb_may_pull(skb, 1004 sizeof(struct iphdr) + 1005 sizeof(struct udphdr))) 1006 goto drop; 1007 1008 b = (struct bootp_pkt *)skb_network_header(skb); 1009 h = &b->iph; 1010 1011 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 1012 goto drop; 1013 1014 /* Fragments are not supported */ 1015 if (ip_is_fragment(h)) { 1016 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); 1017 goto drop; 1018 } 1019 1020 if (skb->len < ntohs(h->tot_len)) 1021 goto drop; 1022 1023 if (ip_fast_csum((char *) h, h->ihl)) 1024 goto drop; 1025 1026 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 1027 goto drop; 1028 1029 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 1030 goto drop; 1031 1032 len = ntohs(b->udph.len) - sizeof(struct udphdr); 1033 ext_len = len - (sizeof(*b) - 1034 sizeof(struct iphdr) - 1035 sizeof(struct udphdr) - 1036 sizeof(b->exten)); 1037 if (ext_len < 0) 1038 goto drop; 1039 1040 /* Ok the front looks good, make sure we can get at the rest. */ 1041 if (!pskb_may_pull(skb, skb->len)) 1042 goto drop; 1043 1044 b = (struct bootp_pkt *)skb_network_header(skb); 1045 h = &b->iph; 1046 1047 /* One reply at a time, please. */ 1048 spin_lock(&ic_recv_lock); 1049 1050 /* If we already have a reply, just drop the packet */ 1051 if (ic_got_reply) 1052 goto drop_unlock; 1053 1054 /* Find the ic_device that the packet arrived on */ 1055 d = ic_first_dev; 1056 while (d && d->dev != dev) 1057 d = d->next; 1058 if (!d) 1059 goto drop_unlock; /* should never happen */ 1060 1061 /* Is it a reply to our BOOTP request? */ 1062 if (b->op != BOOTP_REPLY || 1063 b->xid != d->xid) { 1064 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n", 1065 d->dev->name, b->op, b->xid); 1066 goto drop_unlock; 1067 } 1068 1069 /* Parse extensions */ 1070 if (ext_len >= 4 && 1071 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1072 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1073 u8 *ext; 1074 1075 #ifdef IPCONFIG_DHCP 1076 if (ic_proto_enabled & IC_USE_DHCP) { 1077 __be32 server_id = NONE; 1078 int mt = 0; 1079 1080 ext = &b->exten[4]; 1081 while (ext < end && *ext != 0xff) { 1082 u8 *opt = ext++; 1083 if (*opt == 0) /* Padding */ 1084 continue; 1085 ext += *ext + 1; 1086 if (ext >= end) 1087 break; 1088 switch (*opt) { 1089 case 53: /* Message type */ 1090 if (opt[1]) 1091 mt = opt[2]; 1092 break; 1093 case 54: /* Server ID (IP address) */ 1094 if (opt[1] >= 4) 1095 memcpy(&server_id, opt + 2, 4); 1096 break; 1097 } 1098 } 1099 1100 pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name); 1101 1102 switch (mt) { 1103 case DHCPOFFER: 1104 /* While in the process of accepting one offer, 1105 * ignore all others. 1106 */ 1107 if (ic_myaddr != NONE) 1108 goto drop_unlock; 1109 1110 /* Let's accept that offer. */ 1111 ic_myaddr = b->your_ip; 1112 ic_servaddr = server_id; 1113 pr_debug("DHCP: Offered address %pI4 by server %pI4\n", 1114 &ic_myaddr, &b->iph.saddr); 1115 /* The DHCP indicated server address takes 1116 * precedence over the bootp header one if 1117 * they are different. 1118 */ 1119 if ((server_id != NONE) && 1120 (b->server_ip != server_id)) 1121 b->server_ip = ic_servaddr; 1122 break; 1123 1124 case DHCPACK: 1125 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1126 goto drop_unlock; 1127 1128 /* Yeah! */ 1129 break; 1130 1131 default: 1132 /* Urque. Forget it*/ 1133 ic_myaddr = NONE; 1134 ic_servaddr = NONE; 1135 goto drop_unlock; 1136 } 1137 1138 ic_dhcp_msgtype = mt; 1139 1140 } 1141 #endif /* IPCONFIG_DHCP */ 1142 1143 ext = &b->exten[4]; 1144 while (ext < end && *ext != 0xff) { 1145 u8 *opt = ext++; 1146 if (*opt == 0) /* Padding */ 1147 continue; 1148 ext += *ext + 1; 1149 if (ext < end) 1150 ic_do_bootp_ext(opt); 1151 } 1152 } 1153 1154 /* We have a winner! */ 1155 ic_dev = d; 1156 ic_myaddr = b->your_ip; 1157 ic_servaddr = b->server_ip; 1158 ic_addrservaddr = b->iph.saddr; 1159 if (ic_gateway == NONE && b->relay_ip) 1160 ic_gateway = b->relay_ip; 1161 if (ic_nameservers[0] == NONE) 1162 ic_nameservers[0] = ic_servaddr; 1163 ic_got_reply = IC_BOOTP; 1164 1165 drop_unlock: 1166 /* Show's over. Nothing to see here. */ 1167 spin_unlock(&ic_recv_lock); 1168 1169 drop: 1170 /* Throw the packet out. */ 1171 kfree_skb(skb); 1172 1173 return 0; 1174 } 1175 1176 1177 #endif 1178 1179 1180 /* 1181 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1182 */ 1183 1184 #ifdef IPCONFIG_DYNAMIC 1185 1186 static int __init ic_dynamic(void) 1187 { 1188 int retries; 1189 struct ic_device *d; 1190 unsigned long start_jiffies, timeout, jiff; 1191 int do_bootp = ic_proto_have_if & IC_BOOTP; 1192 int do_rarp = ic_proto_have_if & IC_RARP; 1193 1194 /* 1195 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1196 * This routine gets only called when some pieces of information 1197 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1198 */ 1199 if (!ic_proto_enabled) { 1200 pr_err("IP-Config: Incomplete network configuration information\n"); 1201 return -1; 1202 } 1203 1204 #ifdef IPCONFIG_BOOTP 1205 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1206 pr_err("DHCP/BOOTP: No suitable device found\n"); 1207 #endif 1208 #ifdef IPCONFIG_RARP 1209 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1210 pr_err("RARP: No suitable device found\n"); 1211 #endif 1212 1213 if (!ic_proto_have_if) 1214 /* Error message already printed */ 1215 return -1; 1216 1217 /* 1218 * Setup protocols 1219 */ 1220 #ifdef IPCONFIG_BOOTP 1221 if (do_bootp) 1222 ic_bootp_init(); 1223 #endif 1224 #ifdef IPCONFIG_RARP 1225 if (do_rarp) 1226 ic_rarp_init(); 1227 #endif 1228 1229 /* 1230 * Send requests and wait, until we get an answer. This loop 1231 * seems to be a terrible waste of CPU time, but actually there is 1232 * only one process running at all, so we don't need to use any 1233 * scheduler functions. 1234 * [Actually we could now, but the nothing else running note still 1235 * applies.. - AC] 1236 */ 1237 pr_notice("Sending %s%s%s requests .", 1238 do_bootp 1239 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1240 (do_bootp && do_rarp) ? " and " : "", 1241 do_rarp ? "RARP" : ""); 1242 1243 start_jiffies = jiffies; 1244 d = ic_first_dev; 1245 retries = CONF_SEND_RETRIES; 1246 get_random_bytes(&timeout, sizeof(timeout)); 1247 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); 1248 for (;;) { 1249 #ifdef IPCONFIG_BOOTP 1250 if (do_bootp && (d->able & IC_BOOTP)) 1251 ic_bootp_send_if(d, jiffies - start_jiffies); 1252 #endif 1253 #ifdef IPCONFIG_RARP 1254 if (do_rarp && (d->able & IC_RARP)) 1255 ic_rarp_send_if(d); 1256 #endif 1257 1258 if (!d->next) { 1259 jiff = jiffies + timeout; 1260 while (time_before(jiffies, jiff) && !ic_got_reply) 1261 schedule_timeout_uninterruptible(1); 1262 } 1263 #ifdef IPCONFIG_DHCP 1264 /* DHCP isn't done until we get a DHCPACK. */ 1265 if ((ic_got_reply & IC_BOOTP) && 1266 (ic_proto_enabled & IC_USE_DHCP) && 1267 ic_dhcp_msgtype != DHCPACK) { 1268 ic_got_reply = 0; 1269 /* continue on device that got the reply */ 1270 d = ic_dev; 1271 pr_cont(","); 1272 continue; 1273 } 1274 #endif /* IPCONFIG_DHCP */ 1275 1276 if (ic_got_reply) { 1277 pr_cont(" OK\n"); 1278 break; 1279 } 1280 1281 if ((d = d->next)) 1282 continue; 1283 1284 if (! --retries) { 1285 pr_cont(" timed out!\n"); 1286 break; 1287 } 1288 1289 d = ic_first_dev; 1290 1291 timeout = timeout CONF_TIMEOUT_MULT; 1292 if (timeout > CONF_TIMEOUT_MAX) 1293 timeout = CONF_TIMEOUT_MAX; 1294 1295 pr_cont("."); 1296 } 1297 1298 #ifdef IPCONFIG_BOOTP 1299 if (do_bootp) 1300 ic_bootp_cleanup(); 1301 #endif 1302 #ifdef IPCONFIG_RARP 1303 if (do_rarp) 1304 ic_rarp_cleanup(); 1305 #endif 1306 1307 if (!ic_got_reply) { 1308 ic_myaddr = NONE; 1309 return -1; 1310 } 1311 1312 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n", 1313 ((ic_got_reply & IC_RARP) ? "RARP" 1314 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1315 &ic_addrservaddr, &ic_myaddr); 1316 1317 return 0; 1318 } 1319 1320 #endif /* IPCONFIG_DYNAMIC */ 1321 1322 #ifdef CONFIG_PROC_FS 1323 /* proc_dir_entry for /proc/net/ipconfig */ 1324 static struct proc_dir_entry *ipconfig_dir; 1325 1326 /* Name servers: */ 1327 static int pnp_seq_show(struct seq_file *seq, void *v) 1328 { 1329 int i; 1330 1331 if (ic_proto_used & IC_PROTO) 1332 seq_printf(seq, "#PROTO: %s\n", 1333 (ic_proto_used & IC_RARP) ? "RARP" 1334 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1335 else 1336 seq_puts(seq, "#MANUAL\n"); 1337 1338 if (ic_domain[0]) 1339 seq_printf(seq, 1340 "domain %s\n", ic_domain); 1341 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1342 if (ic_nameservers[i] != NONE) 1343 seq_printf(seq, "nameserver %pI4\n", 1344 &ic_nameservers[i]); 1345 } 1346 if (ic_servaddr != NONE) 1347 seq_printf(seq, "bootserver %pI4\n", 1348 &ic_servaddr); 1349 return 0; 1350 } 1351 1352 /* Create the /proc/net/ipconfig directory */ 1353 static int __init ipconfig_proc_net_init(void) 1354 { 1355 ipconfig_dir = proc_net_mkdir(&init_net, "ipconfig", init_net.proc_net); 1356 if (!ipconfig_dir) 1357 return -ENOMEM; 1358 1359 return 0; 1360 } 1361 1362 /* Create a new file under /proc/net/ipconfig */ 1363 static int ipconfig_proc_net_create(const char *name, 1364 const struct proc_ops *proc_ops) 1365 { 1366 char *pname; 1367 struct proc_dir_entry *p; 1368 1369 if (!ipconfig_dir) 1370 return -ENOMEM; 1371 1372 pname = kasprintf(GFP_KERNEL, "%s%s", "ipconfig/", name); 1373 if (!pname) 1374 return -ENOMEM; 1375 1376 p = proc_create(pname, 0444, init_net.proc_net, proc_ops); 1377 kfree(pname); 1378 if (!p) 1379 return -ENOMEM; 1380 1381 return 0; 1382 } 1383 1384 /* Write NTP server IP addresses to /proc/net/ipconfig/ntp_servers */ 1385 static int ntp_servers_show(struct seq_file *seq, void *v) 1386 { 1387 int i; 1388 1389 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) { 1390 if (ic_ntp_servers[i] != NONE) 1391 seq_printf(seq, "%pI4\n", &ic_ntp_servers[i]); 1392 } 1393 return 0; 1394 } 1395 DEFINE_PROC_SHOW_ATTRIBUTE(ntp_servers); 1396 #endif /* CONFIG_PROC_FS */ 1397 1398 /* 1399 * Extract IP address from the parameter string if needed. Note that we 1400 * need to have root_server_addr set _before_ IPConfig gets called as it 1401 * can override it. 1402 */ 1403 __be32 __init root_nfs_parse_addr(char *name) 1404 { 1405 __be32 addr; 1406 int octets = 0; 1407 char *cp, *cq; 1408 1409 cp = cq = name; 1410 while (octets < 4) { 1411 while (*cp >= '0' && *cp <= '9') 1412 cp++; 1413 if (cp == cq || cp - cq > 3) 1414 break; 1415 if (*cp == '.' || octets == 3) 1416 octets++; 1417 if (octets < 4) 1418 cp++; 1419 cq = cp; 1420 } 1421 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1422 if (*cp == ':') 1423 *cp++ = '\0'; 1424 addr = in_aton(name); 1425 memmove(name, cp, strlen(cp) + 1); 1426 } else 1427 addr = NONE; 1428 1429 return addr; 1430 } 1431 1432 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1433 1434 static int __init wait_for_devices(void) 1435 { 1436 int i; 1437 bool try_init_devs = true; 1438 1439 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1440 struct net_device *dev; 1441 int found = 0; 1442 1443 /* make sure deferred device probes are finished */ 1444 wait_for_device_probe(); 1445 1446 rtnl_lock(); 1447 for_each_netdev(&init_net, dev) { 1448 if (ic_is_init_dev(dev)) { 1449 found = 1; 1450 break; 1451 } 1452 } 1453 rtnl_unlock(); 1454 if (found) 1455 return 0; 1456 if (try_init_devs && 1457 (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) { 1458 try_init_devs = false; 1459 wait_for_init_devices_probe(); 1460 } 1461 ssleep(1); 1462 } 1463 return -ENODEV; 1464 } 1465 1466 /* 1467 * IP Autoconfig dispatcher. 1468 */ 1469 1470 static int __init ip_auto_config(void) 1471 { 1472 __be32 addr; 1473 #ifdef IPCONFIG_DYNAMIC 1474 int retries = CONF_OPEN_RETRIES; 1475 #endif 1476 int err; 1477 unsigned int i, count; 1478 1479 /* Initialise all name servers and NTP servers to NONE (but only if the 1480 * "ip=" or "nfsaddrs=" kernel command line parameters weren't decoded, 1481 * otherwise we'll overwrite the IP addresses specified there) 1482 */ 1483 if (ic_set_manually == 0) { 1484 ic_nameservers_predef(); 1485 ic_ntp_servers_predef(); 1486 } 1487 1488 #ifdef CONFIG_PROC_FS 1489 proc_create_single("pnp", 0444, init_net.proc_net, pnp_seq_show); 1490 1491 if (ipconfig_proc_net_init() == 0) 1492 ipconfig_proc_net_create("ntp_servers", &ntp_servers_proc_ops); 1493 #endif /* CONFIG_PROC_FS */ 1494 1495 if (!ic_enable) 1496 return 0; 1497 1498 pr_debug("IP-Config: Entered.\n"); 1499 #ifdef IPCONFIG_DYNAMIC 1500 try_try_again: 1501 #endif 1502 /* Wait for devices to appear */ 1503 err = wait_for_devices(); 1504 if (err) 1505 return err; 1506 1507 /* Setup all network devices */ 1508 err = ic_open_devs(); 1509 if (err) 1510 return err; 1511 1512 /* Give drivers a chance to settle */ 1513 msleep(CONF_POST_OPEN); 1514 1515 /* 1516 * If the config information is insufficient (e.g., our IP address or 1517 * IP address of the boot server is missing or we have multiple network 1518 * interfaces and no default was set), use BOOTP or RARP to get the 1519 * missing values. 1520 */ 1521 if (ic_myaddr == NONE || 1522 #if defined(CONFIG_ROOT_NFS) || defined(CONFIG_CIFS_ROOT) 1523 (root_server_addr == NONE && 1524 ic_servaddr == NONE && 1525 (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) || 1526 #endif 1527 ic_first_dev->next) { 1528 #ifdef IPCONFIG_DYNAMIC 1529 if (ic_dynamic() < 0) { 1530 ic_close_devs(); 1531 1532 /* 1533 * I don't know why, but sometimes the 1534 * eepro100 driver (at least) gets upset and 1535 * doesn't work the first time it's opened. 1536 * But then if you close it and reopen it, it 1537 * works just fine. So we need to try that at 1538 * least once before giving up. 1539 * 1540 * Also, if the root will be NFS-mounted, we 1541 * have nowhere to go if DHCP fails. So we 1542 * just have to keep trying forever. 1543 * 1544 * -- Chip 1545 */ 1546 #ifdef CONFIG_ROOT_NFS 1547 if (ROOT_DEV == Root_NFS) { 1548 pr_err("IP-Config: Retrying forever (NFS root)...\n"); 1549 goto try_try_again; 1550 } 1551 #endif 1552 #ifdef CONFIG_CIFS_ROOT 1553 if (ROOT_DEV == Root_CIFS) { 1554 pr_err("IP-Config: Retrying forever (CIFS root)...\n"); 1555 goto try_try_again; 1556 } 1557 #endif 1558 1559 if (--retries) { 1560 pr_err("IP-Config: Reopening network devices...\n"); 1561 goto try_try_again; 1562 } 1563 1564 /* Oh, well. At least we tried. */ 1565 pr_err("IP-Config: Auto-configuration of network failed\n"); 1566 return -1; 1567 } 1568 #else /* !DYNAMIC */ 1569 pr_err("IP-Config: Incomplete network configuration information\n"); 1570 ic_close_devs(); 1571 return -1; 1572 #endif /* IPCONFIG_DYNAMIC */ 1573 } else { 1574 /* Device selected manually or only one device -> use it */ 1575 ic_dev = ic_first_dev; 1576 } 1577 1578 addr = root_nfs_parse_addr(root_server_path); 1579 if (root_server_addr == NONE) 1580 root_server_addr = addr; 1581 1582 /* 1583 * Use defaults wherever applicable. 1584 */ 1585 if (ic_defaults() < 0) 1586 return -1; 1587 1588 /* 1589 * Record which protocol was actually used. 1590 */ 1591 #ifdef IPCONFIG_DYNAMIC 1592 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1593 #endif 1594 1595 #ifndef IPCONFIG_SILENT 1596 /* 1597 * Clue in the operator. 1598 */ 1599 pr_info("IP-Config: Complete:\n"); 1600 1601 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", 1602 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr, 1603 &ic_myaddr, &ic_netmask, &ic_gateway); 1604 pr_info(" host=%s, domain=%s, nis-domain=%s\n", 1605 utsname()->nodename, ic_domain, utsname()->domainname); 1606 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", 1607 &ic_servaddr, &root_server_addr, root_server_path); 1608 if (ic_dev_mtu) 1609 pr_cont(", mtu=%d", ic_dev_mtu); 1610 /* Name servers (if any): */ 1611 for (i = 0, count = 0; i < CONF_NAMESERVERS_MAX; i++) { 1612 if (ic_nameservers[i] != NONE) { 1613 if (i == 0) 1614 pr_info(" nameserver%u=%pI4", 1615 i, &ic_nameservers[i]); 1616 else 1617 pr_cont(", nameserver%u=%pI4", 1618 i, &ic_nameservers[i]); 1619 1620 count++; 1621 } 1622 if ((i + 1 == CONF_NAMESERVERS_MAX) && count > 0) 1623 pr_cont("\n"); 1624 } 1625 /* NTP servers (if any): */ 1626 for (i = 0, count = 0; i < CONF_NTP_SERVERS_MAX; i++) { 1627 if (ic_ntp_servers[i] != NONE) { 1628 if (i == 0) 1629 pr_info(" ntpserver%u=%pI4", 1630 i, &ic_ntp_servers[i]); 1631 else 1632 pr_cont(", ntpserver%u=%pI4", 1633 i, &ic_ntp_servers[i]); 1634 1635 count++; 1636 } 1637 if ((i + 1 == CONF_NTP_SERVERS_MAX) && count > 0) 1638 pr_cont("\n"); 1639 } 1640 #endif /* !SILENT */ 1641 1642 /* 1643 * Close all network devices except the device we've 1644 * autoconfigured and set up routes. 1645 */ 1646 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1647 err = -1; 1648 else 1649 err = 0; 1650 1651 ic_close_devs(); 1652 1653 return err; 1654 } 1655 1656 late_initcall(ip_auto_config); 1657 1658 1659 /* 1660 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1661 * command line parameter. See Documentation/admin-guide/nfs/nfsroot.rst. 1662 */ 1663 static int __init ic_proto_name(char *name) 1664 { 1665 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1666 return 1; 1667 } 1668 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1669 return 0; 1670 } 1671 #ifdef CONFIG_IP_PNP_DHCP 1672 else if (!strncmp(name, "dhcp", 4)) { 1673 char *client_id; 1674 1675 ic_proto_enabled &= ~IC_RARP; 1676 client_id = strstr(name, "dhcp,"); 1677 if (client_id) { 1678 char *v; 1679 1680 client_id = client_id + 5; 1681 v = strchr(client_id, ','); 1682 if (!v) 1683 return 1; 1684 *v = 0; 1685 if (kstrtou8(client_id, 0, dhcp_client_identifier)) 1686 pr_debug("DHCP: Invalid client identifier type\n"); 1687 strncpy(dhcp_client_identifier + 1, v + 1, 251); 1688 *v = ','; 1689 } 1690 return 1; 1691 } 1692 #endif 1693 #ifdef CONFIG_IP_PNP_BOOTP 1694 else if (!strcmp(name, "bootp")) { 1695 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1696 return 1; 1697 } 1698 #endif 1699 #ifdef CONFIG_IP_PNP_RARP 1700 else if (!strcmp(name, "rarp")) { 1701 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1702 return 1; 1703 } 1704 #endif 1705 #ifdef IPCONFIG_DYNAMIC 1706 else if (!strcmp(name, "both")) { 1707 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1708 return 1; 1709 } 1710 #endif 1711 return 0; 1712 } 1713 1714 static int __init ip_auto_config_setup(char *addrs) 1715 { 1716 char *cp, *ip, *dp; 1717 int num = 0; 1718 1719 ic_set_manually = 1; 1720 ic_enable = 1; 1721 1722 /* 1723 * If any dhcp, bootp etc options are set, leave autoconfig on 1724 * and skip the below static IP processing. 1725 */ 1726 if (ic_proto_name(addrs)) 1727 return 1; 1728 1729 /* If no static IP is given, turn off autoconfig and bail. */ 1730 if (*addrs == 0 || 1731 strcmp(addrs, "off") == 0 || 1732 strcmp(addrs, "none") == 0) { 1733 ic_enable = 0; 1734 return 1; 1735 } 1736 1737 /* Initialise all name servers and NTP servers to NONE */ 1738 ic_nameservers_predef(); 1739 ic_ntp_servers_predef(); 1740 1741 /* Parse string for static IP assignment. */ 1742 ip = addrs; 1743 while (ip && *ip) { 1744 if ((cp = strchr(ip, ':'))) 1745 *cp++ = '\0'; 1746 if (strlen(ip) > 0) { 1747 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip); 1748 switch (num) { 1749 case 0: 1750 if ((ic_myaddr = in_aton(ip)) == ANY) 1751 ic_myaddr = NONE; 1752 break; 1753 case 1: 1754 if ((ic_servaddr = in_aton(ip)) == ANY) 1755 ic_servaddr = NONE; 1756 break; 1757 case 2: 1758 if ((ic_gateway = in_aton(ip)) == ANY) 1759 ic_gateway = NONE; 1760 break; 1761 case 3: 1762 if ((ic_netmask = in_aton(ip)) == ANY) 1763 ic_netmask = NONE; 1764 break; 1765 case 4: 1766 if ((dp = strchr(ip, '.'))) { 1767 *dp++ = '\0'; 1768 strscpy(utsname()->domainname, dp, 1769 sizeof(utsname()->domainname)); 1770 } 1771 strscpy(utsname()->nodename, ip, 1772 sizeof(utsname()->nodename)); 1773 ic_host_name_set = 1; 1774 break; 1775 case 5: 1776 strscpy(user_dev_name, ip, sizeof(user_dev_name)); 1777 break; 1778 case 6: 1779 if (ic_proto_name(ip) == 0 && 1780 ic_myaddr == NONE) { 1781 ic_enable = 0; 1782 } 1783 break; 1784 case 7: 1785 if (CONF_NAMESERVERS_MAX >= 1) { 1786 ic_nameservers[0] = in_aton(ip); 1787 if (ic_nameservers[0] == ANY) 1788 ic_nameservers[0] = NONE; 1789 } 1790 break; 1791 case 8: 1792 if (CONF_NAMESERVERS_MAX >= 2) { 1793 ic_nameservers[1] = in_aton(ip); 1794 if (ic_nameservers[1] == ANY) 1795 ic_nameservers[1] = NONE; 1796 } 1797 break; 1798 case 9: 1799 if (CONF_NTP_SERVERS_MAX >= 1) { 1800 ic_ntp_servers[0] = in_aton(ip); 1801 if (ic_ntp_servers[0] == ANY) 1802 ic_ntp_servers[0] = NONE; 1803 } 1804 break; 1805 } 1806 } 1807 ip = cp; 1808 num++; 1809 } 1810 1811 return 1; 1812 } 1813 __setup("ip=", ip_auto_config_setup); 1814 1815 static int __init nfsaddrs_config_setup(char *addrs) 1816 { 1817 return ip_auto_config_setup(addrs); 1818 } 1819 __setup("nfsaddrs=", nfsaddrs_config_setup); 1820 1821 static int __init vendor_class_identifier_setup(char *addrs) 1822 { 1823 if (strscpy(vendor_class_identifier, addrs, 1824 sizeof(vendor_class_identifier)) 1825 >= sizeof(vendor_class_identifier)) 1826 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n", 1827 vendor_class_identifier); 1828 return 1; 1829 } 1830 __setup("dhcpclass=", vendor_class_identifier_setup); 1831 1832 static int __init set_carrier_timeout(char *str) 1833 { 1834 ssize_t ret; 1835 1836 if (!str) 1837 return 0; 1838 1839 ret = kstrtouint(str, 0, &carrier_timeout); 1840 if (ret) 1841 return 0; 1842 1843 return 1; 1844 } 1845 __setup("carrier_timeout=", set_carrier_timeout); 1846