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_obj(struct ic_device))) { 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 + secs_to_jiffies(20); 278 while (time_before(jiffies, start + 279 secs_to_jiffies(carrier_timeout))) { 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 + secs_to_jiffies(20); 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 /* DHCPACK can overwrite DNS if fallback was set upon first BOOTP reply */ 669 static int ic_nameservers_fallback __initdata; 670 671 /* 672 * Initialize DHCP/BOOTP extension fields in the request. 673 */ 674 675 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 676 677 #ifdef IPCONFIG_DHCP 678 679 static bool __init 680 ic_dhcp_add_option(u8 **options, const u8 *end, u8 type, const void *value, 681 int len) 682 { 683 u8 *e = *options; 684 685 /* leave room for the option header and the END marker */ 686 if (len > U8_MAX || end - e < len + 3) 687 return false; 688 689 *e++ = type; 690 *e++ = len; 691 memcpy(e, value, len); 692 *options = e + len; 693 694 return true; 695 } 696 697 static void __init 698 ic_dhcp_init_options(u8 *options, struct ic_device *d) 699 { 700 static const u8 ic_req_params[] = { 701 1, /* Subnet mask */ 702 3, /* Default gateway */ 703 6, /* DNS server */ 704 12, /* Host name */ 705 15, /* Domain name */ 706 17, /* Boot path */ 707 26, /* MTU */ 708 40, /* NIS domain name */ 709 42, /* NTP servers */ 710 }; 711 u8 mt = (ic_servaddr == NONE) ? DHCPDISCOVER : DHCPREQUEST; 712 u8 *end = options + sizeof(((struct bootp_pkt *)0)->exten); 713 u8 *e = options; 714 int len; 715 716 pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name); 717 718 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 719 e += 4; 720 721 *e++ = 53; /* DHCP message type */ 722 *e++ = 1; 723 *e++ = mt; 724 725 if (mt == DHCPREQUEST) { 726 *e++ = 54; /* Server ID (IP address) */ 727 *e++ = 4; 728 memcpy(e, &ic_servaddr, 4); 729 e += 4; 730 731 *e++ = 50; /* Requested IP address */ 732 *e++ = 4; 733 memcpy(e, &ic_myaddr, 4); 734 e += 4; 735 } 736 737 *e++ = 55; /* Parameter request list */ 738 *e++ = sizeof(ic_req_params); 739 memcpy(e, ic_req_params, sizeof(ic_req_params)); 740 e += sizeof(ic_req_params); 741 742 if (ic_host_name_set) { 743 len = strlen(utsname()->nodename); 744 ic_dhcp_add_option(&e, end, 12, utsname()->nodename, len); 745 } 746 if (*vendor_class_identifier) { 747 len = strlen(vendor_class_identifier); 748 if (ic_dhcp_add_option(&e, end, 60, vendor_class_identifier, len)) 749 pr_info("DHCP: sending class identifier \"%s\"\n", 750 vendor_class_identifier); 751 } 752 len = strlen(dhcp_client_identifier + 1); 753 /* the minimum length of identifier is 2, include 1 byte type */ 754 if (len >= 1) 755 ic_dhcp_add_option(&e, end, 61, dhcp_client_identifier, len + 1); 756 757 *e++ = 255; /* End of the list */ 758 } 759 760 #endif /* IPCONFIG_DHCP */ 761 762 static void __init ic_bootp_init_ext(u8 *e) 763 { 764 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 765 e += 4; 766 *e++ = 1; /* Subnet mask request */ 767 *e++ = 4; 768 e += 4; 769 *e++ = 3; /* Default gateway request */ 770 *e++ = 4; 771 e += 4; 772 #if CONF_NAMESERVERS_MAX > 0 773 *e++ = 6; /* (DNS) name server request */ 774 *e++ = 4 * CONF_NAMESERVERS_MAX; 775 e += 4 * CONF_NAMESERVERS_MAX; 776 #endif 777 *e++ = 12; /* Host name request */ 778 *e++ = 32; 779 e += 32; 780 *e++ = 40; /* NIS Domain name request */ 781 *e++ = 32; 782 e += 32; 783 *e++ = 17; /* Boot path */ 784 *e++ = 40; 785 e += 40; 786 787 *e++ = 57; /* set extension buffer size for reply */ 788 *e++ = 2; 789 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 790 *e++ = 150; 791 792 *e++ = 255; /* End of the list */ 793 } 794 795 796 /* 797 * Initialize the DHCP/BOOTP mechanism. 798 */ 799 static inline void __init ic_bootp_init(void) 800 { 801 /* Re-initialise all name servers and NTP servers to NONE, in case any 802 * were set via the "ip=" or "nfsaddrs=" kernel command line parameters: 803 * any IP addresses specified there will already have been decoded but 804 * are no longer needed 805 */ 806 ic_nameservers_predef(); 807 ic_ntp_servers_predef(); 808 809 dev_add_pack(&bootp_packet_type); 810 } 811 812 813 /* 814 * DHCP/BOOTP cleanup. 815 */ 816 static inline void __init ic_bootp_cleanup(void) 817 { 818 dev_remove_pack(&bootp_packet_type); 819 } 820 821 822 /* 823 * Send DHCP/BOOTP request to single interface. 824 */ 825 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 826 { 827 struct net_device *dev = d->dev; 828 struct sk_buff *skb; 829 struct bootp_pkt *b; 830 struct iphdr *h; 831 int hlen = LL_RESERVED_SPACE(dev); 832 int tlen = dev->needed_tailroom; 833 834 /* Allocate packet */ 835 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, 836 GFP_KERNEL); 837 if (!skb) 838 return; 839 skb_reserve(skb, hlen); 840 b = skb_put_zero(skb, sizeof(struct bootp_pkt)); 841 842 /* Construct IP header */ 843 skb_reset_network_header(skb); 844 h = ip_hdr(skb); 845 h->version = 4; 846 h->ihl = 5; 847 h->tot_len = htons(sizeof(struct bootp_pkt)); 848 h->frag_off = htons(IP_DF); 849 h->ttl = 64; 850 h->protocol = IPPROTO_UDP; 851 h->daddr = htonl(INADDR_BROADCAST); 852 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 853 854 /* Construct UDP header */ 855 b->udph.source = htons(68); 856 b->udph.dest = htons(67); 857 udp_set_len_short(&b->udph, sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 858 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 859 860 /* Construct DHCP/BOOTP header */ 861 b->op = BOOTP_REQUEST; 862 if (dev->type < 256) /* check for false types */ 863 b->htype = dev->type; 864 else if (dev->type == ARPHRD_FDDI) 865 b->htype = ARPHRD_ETHER; 866 else { 867 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type, 868 dev->name); 869 b->htype = dev->type; /* can cause undefined behavior */ 870 } 871 872 /* server_ip and your_ip address are both already zero per RFC2131 */ 873 b->hlen = dev->addr_len; 874 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 875 b->secs = htons(jiffies_diff / HZ); 876 b->xid = d->xid; 877 878 /* add DHCP options or BOOTP extensions */ 879 #ifdef IPCONFIG_DHCP 880 if (ic_proto_enabled & IC_USE_DHCP) 881 ic_dhcp_init_options(b->exten, d); 882 else 883 #endif 884 ic_bootp_init_ext(b->exten); 885 886 /* Chain packet down the line... */ 887 skb->dev = dev; 888 skb->protocol = htons(ETH_P_IP); 889 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 890 dev->broadcast, dev->dev_addr, skb->len) < 0) { 891 kfree_skb(skb); 892 printk("E"); 893 return; 894 } 895 896 if (dev_queue_xmit(skb) < 0) 897 printk("E"); 898 } 899 900 901 /* 902 * Copy BOOTP-supplied string 903 */ 904 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 905 { 906 if (!len) 907 return 0; 908 if (len > max-1) 909 len = max-1; 910 memcpy(dest, src, len); 911 dest[len] = '\0'; 912 return 1; 913 } 914 915 916 /* 917 * Process BOOTP extensions. 918 */ 919 static void __init ic_do_bootp_ext(u8 *ext) 920 { 921 u8 servers; 922 int i; 923 __be16 mtu; 924 925 u8 *c; 926 927 pr_debug("DHCP/BOOTP: Got extension %d:", *ext); 928 for (c=ext+2; c<ext+2+ext[1]; c++) 929 pr_debug(" %02x", *c); 930 pr_debug("\n"); 931 932 switch (*ext++) { 933 case 1: /* Subnet mask */ 934 if (ic_netmask == NONE) 935 memcpy(&ic_netmask, ext+1, 4); 936 break; 937 case 3: /* Default gateway */ 938 if (ic_gateway == NONE) 939 memcpy(&ic_gateway, ext+1, 4); 940 break; 941 case 6: /* DNS server */ 942 servers= *ext/4; 943 if (servers > CONF_NAMESERVERS_MAX) 944 servers = CONF_NAMESERVERS_MAX; 945 for (i = 0; i < servers; i++) { 946 if (ic_nameservers[i] == NONE || 947 ic_nameservers_fallback) 948 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 949 } 950 break; 951 case 12: /* Host name */ 952 if (!ic_host_name_set) { 953 ic_bootp_string(utsname()->nodename, ext+1, *ext, 954 __NEW_UTS_LEN); 955 ic_host_name_set = 1; 956 } 957 break; 958 case 15: /* Domain name (DNS) */ 959 if (!ic_domain[0]) 960 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 961 break; 962 case 17: /* Root path */ 963 if (!root_server_path[0]) 964 ic_bootp_string(root_server_path, ext+1, *ext, 965 sizeof(root_server_path)); 966 break; 967 case 26: /* Interface MTU */ 968 memcpy(&mtu, ext+1, sizeof(mtu)); 969 ic_dev_mtu = ntohs(mtu); 970 break; 971 case 40: /* NIS Domain name (_not_ DNS) */ 972 ic_bootp_string(utsname()->domainname, ext+1, *ext, 973 __NEW_UTS_LEN); 974 break; 975 case 42: /* NTP servers */ 976 servers = *ext / 4; 977 if (servers > CONF_NTP_SERVERS_MAX) 978 servers = CONF_NTP_SERVERS_MAX; 979 for (i = 0; i < servers; i++) { 980 if (ic_ntp_servers[i] == NONE) 981 memcpy(&ic_ntp_servers[i], ext+1+4*i, 4); 982 } 983 break; 984 } 985 } 986 987 988 /* 989 * Receive BOOTP reply. 990 */ 991 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 992 { 993 struct bootp_pkt *b; 994 struct iphdr *h; 995 struct ic_device *d; 996 int len, ext_len; 997 998 if (!net_eq(dev_net(dev), &init_net)) 999 goto drop; 1000 1001 /* Perform verifications before taking the lock. */ 1002 if (skb->pkt_type == PACKET_OTHERHOST) 1003 goto drop; 1004 1005 skb = skb_share_check(skb, GFP_ATOMIC); 1006 if (!skb) 1007 return NET_RX_DROP; 1008 1009 if (!pskb_may_pull(skb, 1010 sizeof(struct iphdr) + 1011 sizeof(struct udphdr))) 1012 goto drop; 1013 1014 b = (struct bootp_pkt *)skb_network_header(skb); 1015 h = &b->iph; 1016 1017 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 1018 goto drop; 1019 1020 /* Fragments are not supported */ 1021 if (ip_is_fragment(h)) { 1022 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); 1023 goto drop; 1024 } 1025 1026 if (skb->len < ntohs(h->tot_len)) 1027 goto drop; 1028 1029 if (ip_fast_csum((char *) h, h->ihl)) 1030 goto drop; 1031 1032 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 1033 goto drop; 1034 1035 if (ntohs(h->tot_len) < udp_get_len_short(&b->udph) + sizeof(struct iphdr)) 1036 goto drop; 1037 1038 len = udp_get_len_short(&b->udph) - sizeof(struct udphdr); 1039 ext_len = len - (sizeof(*b) - 1040 sizeof(struct iphdr) - 1041 sizeof(struct udphdr) - 1042 sizeof(b->exten)); 1043 if (ext_len < 0) 1044 goto drop; 1045 1046 /* Ok the front looks good, make sure we can get at the rest. */ 1047 if (!pskb_may_pull(skb, skb->len)) 1048 goto drop; 1049 1050 b = (struct bootp_pkt *)skb_network_header(skb); 1051 h = &b->iph; 1052 1053 /* One reply at a time, please. */ 1054 spin_lock(&ic_recv_lock); 1055 1056 /* If we already have a reply, just drop the packet */ 1057 if (ic_got_reply) 1058 goto drop_unlock; 1059 1060 /* Find the ic_device that the packet arrived on */ 1061 d = ic_first_dev; 1062 while (d && d->dev != dev) 1063 d = d->next; 1064 if (!d) 1065 goto drop_unlock; /* should never happen */ 1066 1067 /* Is it a reply to our BOOTP request? */ 1068 if (b->op != BOOTP_REPLY || 1069 b->xid != d->xid) { 1070 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n", 1071 d->dev->name, b->op, b->xid); 1072 goto drop_unlock; 1073 } 1074 1075 /* Parse extensions */ 1076 if (ext_len >= 4 && 1077 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1078 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1079 u8 *ext; 1080 1081 #ifdef IPCONFIG_DHCP 1082 if (ic_proto_enabled & IC_USE_DHCP) { 1083 __be32 server_id = NONE; 1084 int mt = 0; 1085 1086 ext = &b->exten[4]; 1087 while (ext < end && *ext != 0xff) { 1088 u8 *opt = ext++; 1089 if (*opt == 0) /* Padding */ 1090 continue; 1091 ext += *ext + 1; 1092 if (ext >= end) 1093 break; 1094 switch (*opt) { 1095 case 53: /* Message type */ 1096 if (opt[1]) 1097 mt = opt[2]; 1098 break; 1099 case 54: /* Server ID (IP address) */ 1100 if (opt[1] >= 4) 1101 memcpy(&server_id, opt + 2, 4); 1102 break; 1103 } 1104 } 1105 1106 pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name); 1107 1108 switch (mt) { 1109 case DHCPOFFER: 1110 /* While in the process of accepting one offer, 1111 * ignore all others. 1112 */ 1113 if (ic_myaddr != NONE) 1114 goto drop_unlock; 1115 1116 /* Let's accept that offer. */ 1117 ic_myaddr = b->your_ip; 1118 ic_servaddr = server_id; 1119 pr_debug("DHCP: Offered address %pI4 by server %pI4\n", 1120 &ic_myaddr, &b->iph.saddr); 1121 /* The DHCP indicated server address takes 1122 * precedence over the bootp header one if 1123 * they are different. 1124 */ 1125 if ((server_id != NONE) && 1126 (b->server_ip != server_id)) 1127 b->server_ip = ic_servaddr; 1128 break; 1129 1130 case DHCPACK: 1131 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1132 goto drop_unlock; 1133 1134 /* Yeah! */ 1135 break; 1136 1137 default: 1138 /* Urque. Forget it*/ 1139 ic_myaddr = NONE; 1140 ic_servaddr = NONE; 1141 goto drop_unlock; 1142 } 1143 1144 ic_dhcp_msgtype = mt; 1145 1146 } 1147 #endif /* IPCONFIG_DHCP */ 1148 1149 ext = &b->exten[4]; 1150 while (ext < end && *ext != 0xff) { 1151 u8 *opt = ext++; 1152 if (*opt == 0) /* Padding */ 1153 continue; 1154 ext += *ext + 1; 1155 if (ext < end) 1156 ic_do_bootp_ext(opt); 1157 } 1158 } 1159 1160 /* We have a winner! */ 1161 ic_dev = d; 1162 ic_myaddr = b->your_ip; 1163 ic_servaddr = b->server_ip; 1164 ic_addrservaddr = b->iph.saddr; 1165 if (ic_gateway == NONE && b->relay_ip) 1166 ic_gateway = b->relay_ip; 1167 if (ic_nameservers[0] == NONE) { 1168 ic_nameservers[0] = ic_servaddr; 1169 ic_nameservers_fallback = 1; 1170 } 1171 ic_got_reply = IC_BOOTP; 1172 1173 drop_unlock: 1174 /* Show's over. Nothing to see here. */ 1175 spin_unlock(&ic_recv_lock); 1176 1177 drop: 1178 /* Throw the packet out. */ 1179 kfree_skb(skb); 1180 1181 return 0; 1182 } 1183 1184 1185 #endif 1186 1187 1188 /* 1189 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1190 */ 1191 1192 #ifdef IPCONFIG_DYNAMIC 1193 1194 static int __init ic_dynamic(void) 1195 { 1196 int retries; 1197 struct ic_device *d; 1198 unsigned long start_jiffies, timeout, jiff; 1199 int do_bootp = ic_proto_have_if & IC_BOOTP; 1200 int do_rarp = ic_proto_have_if & IC_RARP; 1201 1202 /* 1203 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1204 * This routine gets only called when some pieces of information 1205 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1206 */ 1207 if (!ic_proto_enabled) { 1208 pr_err("IP-Config: Incomplete network configuration information\n"); 1209 return -1; 1210 } 1211 1212 #ifdef IPCONFIG_BOOTP 1213 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1214 pr_err("DHCP/BOOTP: No suitable device found\n"); 1215 #endif 1216 #ifdef IPCONFIG_RARP 1217 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1218 pr_err("RARP: No suitable device found\n"); 1219 #endif 1220 1221 if (!ic_proto_have_if) 1222 /* Error message already printed */ 1223 return -1; 1224 1225 /* 1226 * Setup protocols 1227 */ 1228 #ifdef IPCONFIG_BOOTP 1229 if (do_bootp) 1230 ic_bootp_init(); 1231 #endif 1232 #ifdef IPCONFIG_RARP 1233 if (do_rarp) 1234 ic_rarp_init(); 1235 #endif 1236 1237 /* 1238 * Send requests and wait, until we get an answer. This loop 1239 * seems to be a terrible waste of CPU time, but actually there is 1240 * only one process running at all, so we don't need to use any 1241 * scheduler functions. 1242 * [Actually we could now, but the nothing else running note still 1243 * applies.. - AC] 1244 */ 1245 pr_notice("Sending %s%s%s requests .", 1246 do_bootp 1247 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1248 (do_bootp && do_rarp) ? " and " : "", 1249 do_rarp ? "RARP" : ""); 1250 1251 start_jiffies = jiffies; 1252 d = ic_first_dev; 1253 retries = CONF_SEND_RETRIES; 1254 get_random_bytes(&timeout, sizeof(timeout)); 1255 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); 1256 for (;;) { 1257 #ifdef IPCONFIG_BOOTP 1258 if (do_bootp && (d->able & IC_BOOTP)) 1259 ic_bootp_send_if(d, jiffies - start_jiffies); 1260 #endif 1261 #ifdef IPCONFIG_RARP 1262 if (do_rarp && (d->able & IC_RARP)) 1263 ic_rarp_send_if(d); 1264 #endif 1265 1266 if (!d->next) { 1267 jiff = jiffies + timeout; 1268 while (time_before(jiffies, jiff) && !ic_got_reply) 1269 schedule_timeout_uninterruptible(1); 1270 } 1271 #ifdef IPCONFIG_DHCP 1272 /* DHCP isn't done until we get a DHCPACK. */ 1273 if ((ic_got_reply & IC_BOOTP) && 1274 (ic_proto_enabled & IC_USE_DHCP) && 1275 ic_dhcp_msgtype != DHCPACK) { 1276 ic_got_reply = 0; 1277 /* continue on device that got the reply */ 1278 d = ic_dev; 1279 pr_cont(","); 1280 continue; 1281 } 1282 #endif /* IPCONFIG_DHCP */ 1283 1284 if (ic_got_reply) { 1285 pr_cont(" OK\n"); 1286 break; 1287 } 1288 1289 if ((d = d->next)) 1290 continue; 1291 1292 if (! --retries) { 1293 pr_cont(" timed out!\n"); 1294 break; 1295 } 1296 1297 d = ic_first_dev; 1298 1299 timeout = timeout CONF_TIMEOUT_MULT; 1300 if (timeout > CONF_TIMEOUT_MAX) 1301 timeout = CONF_TIMEOUT_MAX; 1302 1303 pr_cont("."); 1304 } 1305 1306 #ifdef IPCONFIG_BOOTP 1307 if (do_bootp) 1308 ic_bootp_cleanup(); 1309 #endif 1310 #ifdef IPCONFIG_RARP 1311 if (do_rarp) 1312 ic_rarp_cleanup(); 1313 #endif 1314 1315 if (!ic_got_reply) { 1316 ic_myaddr = NONE; 1317 return -1; 1318 } 1319 1320 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n", 1321 ((ic_got_reply & IC_RARP) ? "RARP" 1322 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1323 &ic_addrservaddr, &ic_myaddr); 1324 1325 return 0; 1326 } 1327 1328 #endif /* IPCONFIG_DYNAMIC */ 1329 1330 #ifdef CONFIG_PROC_FS 1331 /* proc_dir_entry for /proc/net/ipconfig */ 1332 static struct proc_dir_entry *ipconfig_dir; 1333 1334 /* Name servers: */ 1335 static int pnp_seq_show(struct seq_file *seq, void *v) 1336 { 1337 int i; 1338 1339 if (ic_proto_used & IC_PROTO) 1340 seq_printf(seq, "#PROTO: %s\n", 1341 (ic_proto_used & IC_RARP) ? "RARP" 1342 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1343 else 1344 seq_puts(seq, "#MANUAL\n"); 1345 1346 if (ic_domain[0]) 1347 seq_printf(seq, 1348 "domain %s\n", ic_domain); 1349 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1350 if (ic_nameservers[i] != NONE) 1351 seq_printf(seq, "nameserver %pI4\n", 1352 &ic_nameservers[i]); 1353 } 1354 if (ic_servaddr != NONE) 1355 seq_printf(seq, "bootserver %pI4\n", 1356 &ic_servaddr); 1357 return 0; 1358 } 1359 1360 /* Create the /proc/net/ipconfig directory */ 1361 static int __init ipconfig_proc_net_init(void) 1362 { 1363 ipconfig_dir = proc_net_mkdir(&init_net, "ipconfig", init_net.proc_net); 1364 if (!ipconfig_dir) 1365 return -ENOMEM; 1366 1367 return 0; 1368 } 1369 1370 /* Create a new file under /proc/net/ipconfig */ 1371 static int ipconfig_proc_net_create(const char *name, 1372 const struct proc_ops *proc_ops) 1373 { 1374 char *pname; 1375 struct proc_dir_entry *p; 1376 1377 if (!ipconfig_dir) 1378 return -ENOMEM; 1379 1380 pname = kasprintf(GFP_KERNEL, "%s%s", "ipconfig/", name); 1381 if (!pname) 1382 return -ENOMEM; 1383 1384 p = proc_create(pname, 0444, init_net.proc_net, proc_ops); 1385 kfree(pname); 1386 if (!p) 1387 return -ENOMEM; 1388 1389 return 0; 1390 } 1391 1392 /* Write NTP server IP addresses to /proc/net/ipconfig/ntp_servers */ 1393 static int ntp_servers_show(struct seq_file *seq, void *v) 1394 { 1395 int i; 1396 1397 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) { 1398 if (ic_ntp_servers[i] != NONE) 1399 seq_printf(seq, "%pI4\n", &ic_ntp_servers[i]); 1400 } 1401 return 0; 1402 } 1403 DEFINE_PROC_SHOW_ATTRIBUTE(ntp_servers); 1404 #endif /* CONFIG_PROC_FS */ 1405 1406 /* 1407 * Extract IP address from the parameter string if needed. Note that we 1408 * need to have root_server_addr set _before_ IPConfig gets called as it 1409 * can override it. 1410 */ 1411 __be32 __init root_nfs_parse_addr(char *name) 1412 { 1413 __be32 addr; 1414 int octets = 0; 1415 char *cp, *cq; 1416 1417 cp = cq = name; 1418 while (octets < 4) { 1419 while (*cp >= '0' && *cp <= '9') 1420 cp++; 1421 if (cp == cq || cp - cq > 3) 1422 break; 1423 if (*cp == '.' || octets == 3) 1424 octets++; 1425 if (octets < 4) 1426 cp++; 1427 cq = cp; 1428 } 1429 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1430 if (*cp == ':') 1431 *cp++ = '\0'; 1432 addr = in_aton(name); 1433 memmove(name, cp, strlen(cp) + 1); 1434 } else 1435 addr = NONE; 1436 1437 return addr; 1438 } 1439 1440 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1441 1442 static int __init wait_for_devices(void) 1443 { 1444 int i; 1445 bool try_init_devs = true; 1446 1447 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1448 struct net_device *dev; 1449 int found = 0; 1450 1451 /* make sure deferred device probes are finished */ 1452 wait_for_device_probe(); 1453 1454 rtnl_lock(); 1455 for_each_netdev(&init_net, dev) { 1456 if (ic_is_init_dev(dev)) { 1457 found = 1; 1458 break; 1459 } 1460 } 1461 rtnl_unlock(); 1462 if (found) 1463 return 0; 1464 if (try_init_devs && 1465 (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) { 1466 try_init_devs = false; 1467 wait_for_init_devices_probe(); 1468 } 1469 ssleep(1); 1470 } 1471 return -ENODEV; 1472 } 1473 1474 /* 1475 * IP Autoconfig dispatcher. 1476 */ 1477 1478 static int __init ip_auto_config(void) 1479 { 1480 __be32 addr; 1481 #ifdef IPCONFIG_DYNAMIC 1482 int retries = CONF_OPEN_RETRIES; 1483 #endif 1484 int err; 1485 unsigned int i, count; 1486 1487 /* Initialise all name servers and NTP servers to NONE (but only if the 1488 * "ip=" or "nfsaddrs=" kernel command line parameters weren't decoded, 1489 * otherwise we'll overwrite the IP addresses specified there) 1490 */ 1491 if (ic_set_manually == 0) { 1492 ic_nameservers_predef(); 1493 ic_ntp_servers_predef(); 1494 } 1495 1496 #ifdef CONFIG_PROC_FS 1497 proc_create_single("pnp", 0444, init_net.proc_net, pnp_seq_show); 1498 1499 if (ipconfig_proc_net_init() == 0) 1500 ipconfig_proc_net_create("ntp_servers", &ntp_servers_proc_ops); 1501 #endif /* CONFIG_PROC_FS */ 1502 1503 if (!ic_enable) 1504 return 0; 1505 1506 pr_debug("IP-Config: Entered.\n"); 1507 #ifdef IPCONFIG_DYNAMIC 1508 try_try_again: 1509 #endif 1510 /* Wait for devices to appear */ 1511 err = wait_for_devices(); 1512 if (err) 1513 return err; 1514 1515 /* Setup all network devices */ 1516 err = ic_open_devs(); 1517 if (err) 1518 return err; 1519 1520 /* Give drivers a chance to settle */ 1521 msleep(CONF_POST_OPEN); 1522 1523 /* 1524 * If the config information is insufficient (e.g., our IP address or 1525 * IP address of the boot server is missing or we have multiple network 1526 * interfaces and no default was set), use BOOTP or RARP to get the 1527 * missing values. 1528 */ 1529 if (ic_myaddr == NONE || 1530 #if defined(CONFIG_ROOT_NFS) || defined(CONFIG_CIFS_ROOT) 1531 (root_server_addr == NONE && 1532 ic_servaddr == NONE && 1533 (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) || 1534 #endif 1535 ic_first_dev->next) { 1536 #ifdef IPCONFIG_DYNAMIC 1537 if (ic_dynamic() < 0) { 1538 ic_close_devs(); 1539 1540 /* 1541 * I don't know why, but sometimes the 1542 * eepro100 driver (at least) gets upset and 1543 * doesn't work the first time it's opened. 1544 * But then if you close it and reopen it, it 1545 * works just fine. So we need to try that at 1546 * least once before giving up. 1547 * 1548 * Also, if the root will be NFS-mounted, we 1549 * have nowhere to go if DHCP fails. So we 1550 * just have to keep trying forever. 1551 * 1552 * -- Chip 1553 */ 1554 #ifdef CONFIG_ROOT_NFS 1555 if (ROOT_DEV == Root_NFS) { 1556 pr_err("IP-Config: Retrying forever (NFS root)...\n"); 1557 goto try_try_again; 1558 } 1559 #endif 1560 #ifdef CONFIG_CIFS_ROOT 1561 if (ROOT_DEV == Root_CIFS) { 1562 pr_err("IP-Config: Retrying forever (CIFS root)...\n"); 1563 goto try_try_again; 1564 } 1565 #endif 1566 1567 if (--retries) { 1568 pr_err("IP-Config: Reopening network devices...\n"); 1569 goto try_try_again; 1570 } 1571 1572 /* Oh, well. At least we tried. */ 1573 pr_err("IP-Config: Auto-configuration of network failed\n"); 1574 return -1; 1575 } 1576 #else /* !DYNAMIC */ 1577 pr_err("IP-Config: Incomplete network configuration information\n"); 1578 ic_close_devs(); 1579 return -1; 1580 #endif /* IPCONFIG_DYNAMIC */ 1581 } else { 1582 /* Device selected manually or only one device -> use it */ 1583 ic_dev = ic_first_dev; 1584 } 1585 1586 addr = root_nfs_parse_addr(root_server_path); 1587 if (root_server_addr == NONE) 1588 root_server_addr = addr; 1589 1590 /* 1591 * Use defaults wherever applicable. 1592 */ 1593 if (ic_defaults() < 0) 1594 return -1; 1595 1596 /* 1597 * Record which protocol was actually used. 1598 */ 1599 #ifdef IPCONFIG_DYNAMIC 1600 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1601 #endif 1602 1603 #ifndef IPCONFIG_SILENT 1604 /* 1605 * Clue in the operator. 1606 */ 1607 pr_info("IP-Config: Complete:\n"); 1608 1609 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", 1610 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr, 1611 &ic_myaddr, &ic_netmask, &ic_gateway); 1612 pr_info(" host=%s, domain=%s, nis-domain=%s\n", 1613 utsname()->nodename, ic_domain, utsname()->domainname); 1614 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", 1615 &ic_servaddr, &root_server_addr, root_server_path); 1616 if (ic_dev_mtu) 1617 pr_cont(", mtu=%d", ic_dev_mtu); 1618 /* Name servers (if any): */ 1619 for (i = 0, count = 0; i < CONF_NAMESERVERS_MAX; i++) { 1620 if (ic_nameservers[i] != NONE) { 1621 if (i == 0) 1622 pr_info(" nameserver%u=%pI4", 1623 i, &ic_nameservers[i]); 1624 else 1625 pr_cont(", nameserver%u=%pI4", 1626 i, &ic_nameservers[i]); 1627 1628 count++; 1629 } 1630 if ((i + 1 == CONF_NAMESERVERS_MAX) && count > 0) 1631 pr_cont("\n"); 1632 } 1633 /* NTP servers (if any): */ 1634 for (i = 0, count = 0; i < CONF_NTP_SERVERS_MAX; i++) { 1635 if (ic_ntp_servers[i] != NONE) { 1636 if (i == 0) 1637 pr_info(" ntpserver%u=%pI4", 1638 i, &ic_ntp_servers[i]); 1639 else 1640 pr_cont(", ntpserver%u=%pI4", 1641 i, &ic_ntp_servers[i]); 1642 1643 count++; 1644 } 1645 if ((i + 1 == CONF_NTP_SERVERS_MAX) && count > 0) 1646 pr_cont("\n"); 1647 } 1648 #endif /* !SILENT */ 1649 1650 /* 1651 * Close all network devices except the device we've 1652 * autoconfigured and set up routes. 1653 */ 1654 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1655 err = -1; 1656 else 1657 err = 0; 1658 1659 ic_close_devs(); 1660 1661 return err; 1662 } 1663 1664 late_initcall(ip_auto_config); 1665 1666 1667 /* 1668 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1669 * command line parameter. See Documentation/admin-guide/nfs/nfsroot.rst. 1670 */ 1671 static int __init ic_proto_name(char *name) 1672 { 1673 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1674 return 1; 1675 } 1676 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1677 return 0; 1678 } 1679 #ifdef CONFIG_IP_PNP_DHCP 1680 else if (!strncmp(name, "dhcp", 4)) { 1681 char *client_id; 1682 1683 ic_proto_enabled &= ~IC_RARP; 1684 client_id = strstr(name, "dhcp,"); 1685 if (client_id) { 1686 char *v; 1687 1688 client_id = client_id + 5; 1689 v = strchr(client_id, ','); 1690 if (!v) 1691 return 1; 1692 *v = 0; 1693 if (kstrtou8(client_id, 0, dhcp_client_identifier)) 1694 pr_debug("DHCP: Invalid client identifier type\n"); 1695 strscpy(dhcp_client_identifier + 1, v + 1, 1696 sizeof(dhcp_client_identifier) - 1); 1697 *v = ','; 1698 } 1699 return 1; 1700 } 1701 #endif 1702 #ifdef CONFIG_IP_PNP_BOOTP 1703 else if (!strcmp(name, "bootp")) { 1704 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1705 return 1; 1706 } 1707 #endif 1708 #ifdef CONFIG_IP_PNP_RARP 1709 else if (!strcmp(name, "rarp")) { 1710 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1711 return 1; 1712 } 1713 #endif 1714 #ifdef IPCONFIG_DYNAMIC 1715 else if (!strcmp(name, "both")) { 1716 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1717 return 1; 1718 } 1719 #endif 1720 return 0; 1721 } 1722 1723 static int __init ip_auto_config_setup(char *addrs) 1724 { 1725 char *cp, *ip, *dp; 1726 int num = 0; 1727 1728 ic_set_manually = 1; 1729 ic_enable = 1; 1730 1731 /* 1732 * If any dhcp, bootp etc options are set, leave autoconfig on 1733 * and skip the below static IP processing. 1734 */ 1735 if (ic_proto_name(addrs)) 1736 return 1; 1737 1738 /* If no static IP is given, turn off autoconfig and bail. */ 1739 if (*addrs == 0 || 1740 strcmp(addrs, "off") == 0 || 1741 strcmp(addrs, "none") == 0) { 1742 ic_enable = 0; 1743 return 1; 1744 } 1745 1746 /* Initialise all name servers and NTP servers to NONE */ 1747 ic_nameservers_predef(); 1748 ic_ntp_servers_predef(); 1749 1750 /* Parse string for static IP assignment. */ 1751 ip = addrs; 1752 while (ip && *ip) { 1753 if ((cp = strchr(ip, ':'))) 1754 *cp++ = '\0'; 1755 if (strlen(ip) > 0) { 1756 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip); 1757 switch (num) { 1758 case 0: 1759 if ((ic_myaddr = in_aton(ip)) == ANY) 1760 ic_myaddr = NONE; 1761 break; 1762 case 1: 1763 if ((ic_servaddr = in_aton(ip)) == ANY) 1764 ic_servaddr = NONE; 1765 break; 1766 case 2: 1767 if ((ic_gateway = in_aton(ip)) == ANY) 1768 ic_gateway = NONE; 1769 break; 1770 case 3: 1771 if ((ic_netmask = in_aton(ip)) == ANY) 1772 ic_netmask = NONE; 1773 break; 1774 case 4: 1775 if ((dp = strchr(ip, '.'))) { 1776 *dp++ = '\0'; 1777 strscpy(utsname()->domainname, dp, 1778 sizeof(utsname()->domainname)); 1779 } 1780 strscpy(utsname()->nodename, ip, 1781 sizeof(utsname()->nodename)); 1782 ic_host_name_set = 1; 1783 break; 1784 case 5: 1785 strscpy(user_dev_name, ip, sizeof(user_dev_name)); 1786 break; 1787 case 6: 1788 if (ic_proto_name(ip) == 0 && 1789 ic_myaddr == NONE) { 1790 ic_enable = 0; 1791 } 1792 break; 1793 case 7: 1794 if (CONF_NAMESERVERS_MAX >= 1) { 1795 ic_nameservers[0] = in_aton(ip); 1796 if (ic_nameservers[0] == ANY) 1797 ic_nameservers[0] = NONE; 1798 } 1799 break; 1800 case 8: 1801 if (CONF_NAMESERVERS_MAX >= 2) { 1802 ic_nameservers[1] = in_aton(ip); 1803 if (ic_nameservers[1] == ANY) 1804 ic_nameservers[1] = NONE; 1805 } 1806 break; 1807 case 9: 1808 if (CONF_NTP_SERVERS_MAX >= 1) { 1809 ic_ntp_servers[0] = in_aton(ip); 1810 if (ic_ntp_servers[0] == ANY) 1811 ic_ntp_servers[0] = NONE; 1812 } 1813 break; 1814 } 1815 } 1816 ip = cp; 1817 num++; 1818 } 1819 1820 return 1; 1821 } 1822 __setup("ip=", ip_auto_config_setup); 1823 1824 static int __init nfsaddrs_config_setup(char *addrs) 1825 { 1826 return ip_auto_config_setup(addrs); 1827 } 1828 __setup("nfsaddrs=", nfsaddrs_config_setup); 1829 1830 static int __init vendor_class_identifier_setup(char *addrs) 1831 { 1832 if (strscpy(vendor_class_identifier, addrs, 1833 sizeof(vendor_class_identifier)) 1834 >= sizeof(vendor_class_identifier)) 1835 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n", 1836 vendor_class_identifier); 1837 return 1; 1838 } 1839 __setup("dhcpclass=", vendor_class_identifier_setup); 1840 1841 static int __init set_carrier_timeout(char *str) 1842 { 1843 ssize_t ret; 1844 1845 if (!str) 1846 return 0; 1847 1848 ret = kstrtouint(str, 0, &carrier_timeout); 1849 if (ret) 1850 return 0; 1851 1852 return 1; 1853 } 1854 __setup("carrier_timeout=", set_carrier_timeout); 1855