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 + 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 void __init 680 ic_dhcp_init_options(u8 *options, struct ic_device *d) 681 { 682 static const u8 ic_req_params[] = { 683 1, /* Subnet mask */ 684 3, /* Default gateway */ 685 6, /* DNS server */ 686 12, /* Host name */ 687 15, /* Domain name */ 688 17, /* Boot path */ 689 26, /* MTU */ 690 40, /* NIS domain name */ 691 42, /* NTP servers */ 692 }; 693 u8 mt = (ic_servaddr == NONE) ? DHCPDISCOVER : DHCPREQUEST; 694 u8 *e = options; 695 int len; 696 697 pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name); 698 699 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 700 e += 4; 701 702 *e++ = 53; /* DHCP message type */ 703 *e++ = 1; 704 *e++ = mt; 705 706 if (mt == DHCPREQUEST) { 707 *e++ = 54; /* Server ID (IP address) */ 708 *e++ = 4; 709 memcpy(e, &ic_servaddr, 4); 710 e += 4; 711 712 *e++ = 50; /* Requested IP address */ 713 *e++ = 4; 714 memcpy(e, &ic_myaddr, 4); 715 e += 4; 716 } 717 718 *e++ = 55; /* Parameter request list */ 719 *e++ = sizeof(ic_req_params); 720 memcpy(e, ic_req_params, sizeof(ic_req_params)); 721 e += sizeof(ic_req_params); 722 723 if (ic_host_name_set) { 724 *e++ = 12; /* host-name */ 725 len = strlen(utsname()->nodename); 726 *e++ = len; 727 memcpy(e, utsname()->nodename, len); 728 e += len; 729 } 730 if (*vendor_class_identifier) { 731 pr_info("DHCP: sending class identifier \"%s\"\n", 732 vendor_class_identifier); 733 *e++ = 60; /* Class-identifier */ 734 len = strlen(vendor_class_identifier); 735 *e++ = len; 736 memcpy(e, vendor_class_identifier, len); 737 e += len; 738 } 739 len = strlen(dhcp_client_identifier + 1); 740 /* the minimum length of identifier is 2, include 1 byte type, 741 * and can not be larger than the length of options 742 */ 743 if (len >= 1 && len < 312 - (e - options) - 1) { 744 *e++ = 61; 745 *e++ = len + 1; 746 memcpy(e, dhcp_client_identifier, len + 1); 747 e += len + 1; 748 } 749 750 *e++ = 255; /* End of the list */ 751 } 752 753 #endif /* IPCONFIG_DHCP */ 754 755 static void __init ic_bootp_init_ext(u8 *e) 756 { 757 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 758 e += 4; 759 *e++ = 1; /* Subnet mask request */ 760 *e++ = 4; 761 e += 4; 762 *e++ = 3; /* Default gateway request */ 763 *e++ = 4; 764 e += 4; 765 #if CONF_NAMESERVERS_MAX > 0 766 *e++ = 6; /* (DNS) name server request */ 767 *e++ = 4 * CONF_NAMESERVERS_MAX; 768 e += 4 * CONF_NAMESERVERS_MAX; 769 #endif 770 *e++ = 12; /* Host name request */ 771 *e++ = 32; 772 e += 32; 773 *e++ = 40; /* NIS Domain name request */ 774 *e++ = 32; 775 e += 32; 776 *e++ = 17; /* Boot path */ 777 *e++ = 40; 778 e += 40; 779 780 *e++ = 57; /* set extension buffer size for reply */ 781 *e++ = 2; 782 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 783 *e++ = 150; 784 785 *e++ = 255; /* End of the list */ 786 } 787 788 789 /* 790 * Initialize the DHCP/BOOTP mechanism. 791 */ 792 static inline void __init ic_bootp_init(void) 793 { 794 /* Re-initialise all name servers and NTP servers to NONE, in case any 795 * were set via the "ip=" or "nfsaddrs=" kernel command line parameters: 796 * any IP addresses specified there will already have been decoded but 797 * are no longer needed 798 */ 799 ic_nameservers_predef(); 800 ic_ntp_servers_predef(); 801 802 dev_add_pack(&bootp_packet_type); 803 } 804 805 806 /* 807 * DHCP/BOOTP cleanup. 808 */ 809 static inline void __init ic_bootp_cleanup(void) 810 { 811 dev_remove_pack(&bootp_packet_type); 812 } 813 814 815 /* 816 * Send DHCP/BOOTP request to single interface. 817 */ 818 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 819 { 820 struct net_device *dev = d->dev; 821 struct sk_buff *skb; 822 struct bootp_pkt *b; 823 struct iphdr *h; 824 int hlen = LL_RESERVED_SPACE(dev); 825 int tlen = dev->needed_tailroom; 826 827 /* Allocate packet */ 828 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, 829 GFP_KERNEL); 830 if (!skb) 831 return; 832 skb_reserve(skb, hlen); 833 b = skb_put_zero(skb, sizeof(struct bootp_pkt)); 834 835 /* Construct IP header */ 836 skb_reset_network_header(skb); 837 h = ip_hdr(skb); 838 h->version = 4; 839 h->ihl = 5; 840 h->tot_len = htons(sizeof(struct bootp_pkt)); 841 h->frag_off = htons(IP_DF); 842 h->ttl = 64; 843 h->protocol = IPPROTO_UDP; 844 h->daddr = htonl(INADDR_BROADCAST); 845 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 846 847 /* Construct UDP header */ 848 b->udph.source = htons(68); 849 b->udph.dest = htons(67); 850 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 851 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 852 853 /* Construct DHCP/BOOTP header */ 854 b->op = BOOTP_REQUEST; 855 if (dev->type < 256) /* check for false types */ 856 b->htype = dev->type; 857 else if (dev->type == ARPHRD_FDDI) 858 b->htype = ARPHRD_ETHER; 859 else { 860 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type, 861 dev->name); 862 b->htype = dev->type; /* can cause undefined behavior */ 863 } 864 865 /* server_ip and your_ip address are both already zero per RFC2131 */ 866 b->hlen = dev->addr_len; 867 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 868 b->secs = htons(jiffies_diff / HZ); 869 b->xid = d->xid; 870 871 /* add DHCP options or BOOTP extensions */ 872 #ifdef IPCONFIG_DHCP 873 if (ic_proto_enabled & IC_USE_DHCP) 874 ic_dhcp_init_options(b->exten, d); 875 else 876 #endif 877 ic_bootp_init_ext(b->exten); 878 879 /* Chain packet down the line... */ 880 skb->dev = dev; 881 skb->protocol = htons(ETH_P_IP); 882 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 883 dev->broadcast, dev->dev_addr, skb->len) < 0) { 884 kfree_skb(skb); 885 printk("E"); 886 return; 887 } 888 889 if (dev_queue_xmit(skb) < 0) 890 printk("E"); 891 } 892 893 894 /* 895 * Copy BOOTP-supplied string 896 */ 897 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 898 { 899 if (!len) 900 return 0; 901 if (len > max-1) 902 len = max-1; 903 memcpy(dest, src, len); 904 dest[len] = '\0'; 905 return 1; 906 } 907 908 909 /* 910 * Process BOOTP extensions. 911 */ 912 static void __init ic_do_bootp_ext(u8 *ext) 913 { 914 u8 servers; 915 int i; 916 __be16 mtu; 917 918 u8 *c; 919 920 pr_debug("DHCP/BOOTP: Got extension %d:", *ext); 921 for (c=ext+2; c<ext+2+ext[1]; c++) 922 pr_debug(" %02x", *c); 923 pr_debug("\n"); 924 925 switch (*ext++) { 926 case 1: /* Subnet mask */ 927 if (ic_netmask == NONE) 928 memcpy(&ic_netmask, ext+1, 4); 929 break; 930 case 3: /* Default gateway */ 931 if (ic_gateway == NONE) 932 memcpy(&ic_gateway, ext+1, 4); 933 break; 934 case 6: /* DNS server */ 935 servers= *ext/4; 936 if (servers > CONF_NAMESERVERS_MAX) 937 servers = CONF_NAMESERVERS_MAX; 938 for (i = 0; i < servers; i++) { 939 if (ic_nameservers[i] == NONE || 940 ic_nameservers_fallback) 941 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 942 } 943 break; 944 case 12: /* Host name */ 945 if (!ic_host_name_set) { 946 ic_bootp_string(utsname()->nodename, ext+1, *ext, 947 __NEW_UTS_LEN); 948 ic_host_name_set = 1; 949 } 950 break; 951 case 15: /* Domain name (DNS) */ 952 if (!ic_domain[0]) 953 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 954 break; 955 case 17: /* Root path */ 956 if (!root_server_path[0]) 957 ic_bootp_string(root_server_path, ext+1, *ext, 958 sizeof(root_server_path)); 959 break; 960 case 26: /* Interface MTU */ 961 memcpy(&mtu, ext+1, sizeof(mtu)); 962 ic_dev_mtu = ntohs(mtu); 963 break; 964 case 40: /* NIS Domain name (_not_ DNS) */ 965 ic_bootp_string(utsname()->domainname, ext+1, *ext, 966 __NEW_UTS_LEN); 967 break; 968 case 42: /* NTP servers */ 969 servers = *ext / 4; 970 if (servers > CONF_NTP_SERVERS_MAX) 971 servers = CONF_NTP_SERVERS_MAX; 972 for (i = 0; i < servers; i++) { 973 if (ic_ntp_servers[i] == NONE) 974 memcpy(&ic_ntp_servers[i], ext+1+4*i, 4); 975 } 976 break; 977 } 978 } 979 980 981 /* 982 * Receive BOOTP reply. 983 */ 984 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 985 { 986 struct bootp_pkt *b; 987 struct iphdr *h; 988 struct ic_device *d; 989 int len, ext_len; 990 991 if (!net_eq(dev_net(dev), &init_net)) 992 goto drop; 993 994 /* Perform verifications before taking the lock. */ 995 if (skb->pkt_type == PACKET_OTHERHOST) 996 goto drop; 997 998 skb = skb_share_check(skb, GFP_ATOMIC); 999 if (!skb) 1000 return NET_RX_DROP; 1001 1002 if (!pskb_may_pull(skb, 1003 sizeof(struct iphdr) + 1004 sizeof(struct udphdr))) 1005 goto drop; 1006 1007 b = (struct bootp_pkt *)skb_network_header(skb); 1008 h = &b->iph; 1009 1010 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 1011 goto drop; 1012 1013 /* Fragments are not supported */ 1014 if (ip_is_fragment(h)) { 1015 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); 1016 goto drop; 1017 } 1018 1019 if (skb->len < ntohs(h->tot_len)) 1020 goto drop; 1021 1022 if (ip_fast_csum((char *) h, h->ihl)) 1023 goto drop; 1024 1025 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 1026 goto drop; 1027 1028 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 1029 goto drop; 1030 1031 len = ntohs(b->udph.len) - sizeof(struct udphdr); 1032 ext_len = len - (sizeof(*b) - 1033 sizeof(struct iphdr) - 1034 sizeof(struct udphdr) - 1035 sizeof(b->exten)); 1036 if (ext_len < 0) 1037 goto drop; 1038 1039 /* Ok the front looks good, make sure we can get at the rest. */ 1040 if (!pskb_may_pull(skb, skb->len)) 1041 goto drop; 1042 1043 b = (struct bootp_pkt *)skb_network_header(skb); 1044 h = &b->iph; 1045 1046 /* One reply at a time, please. */ 1047 spin_lock(&ic_recv_lock); 1048 1049 /* If we already have a reply, just drop the packet */ 1050 if (ic_got_reply) 1051 goto drop_unlock; 1052 1053 /* Find the ic_device that the packet arrived on */ 1054 d = ic_first_dev; 1055 while (d && d->dev != dev) 1056 d = d->next; 1057 if (!d) 1058 goto drop_unlock; /* should never happen */ 1059 1060 /* Is it a reply to our BOOTP request? */ 1061 if (b->op != BOOTP_REPLY || 1062 b->xid != d->xid) { 1063 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n", 1064 d->dev->name, b->op, b->xid); 1065 goto drop_unlock; 1066 } 1067 1068 /* Parse extensions */ 1069 if (ext_len >= 4 && 1070 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1071 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1072 u8 *ext; 1073 1074 #ifdef IPCONFIG_DHCP 1075 if (ic_proto_enabled & IC_USE_DHCP) { 1076 __be32 server_id = NONE; 1077 int mt = 0; 1078 1079 ext = &b->exten[4]; 1080 while (ext < end && *ext != 0xff) { 1081 u8 *opt = ext++; 1082 if (*opt == 0) /* Padding */ 1083 continue; 1084 ext += *ext + 1; 1085 if (ext >= end) 1086 break; 1087 switch (*opt) { 1088 case 53: /* Message type */ 1089 if (opt[1]) 1090 mt = opt[2]; 1091 break; 1092 case 54: /* Server ID (IP address) */ 1093 if (opt[1] >= 4) 1094 memcpy(&server_id, opt + 2, 4); 1095 break; 1096 } 1097 } 1098 1099 pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name); 1100 1101 switch (mt) { 1102 case DHCPOFFER: 1103 /* While in the process of accepting one offer, 1104 * ignore all others. 1105 */ 1106 if (ic_myaddr != NONE) 1107 goto drop_unlock; 1108 1109 /* Let's accept that offer. */ 1110 ic_myaddr = b->your_ip; 1111 ic_servaddr = server_id; 1112 pr_debug("DHCP: Offered address %pI4 by server %pI4\n", 1113 &ic_myaddr, &b->iph.saddr); 1114 /* The DHCP indicated server address takes 1115 * precedence over the bootp header one if 1116 * they are different. 1117 */ 1118 if ((server_id != NONE) && 1119 (b->server_ip != server_id)) 1120 b->server_ip = ic_servaddr; 1121 break; 1122 1123 case DHCPACK: 1124 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1125 goto drop_unlock; 1126 1127 /* Yeah! */ 1128 break; 1129 1130 default: 1131 /* Urque. Forget it*/ 1132 ic_myaddr = NONE; 1133 ic_servaddr = NONE; 1134 goto drop_unlock; 1135 } 1136 1137 ic_dhcp_msgtype = mt; 1138 1139 } 1140 #endif /* IPCONFIG_DHCP */ 1141 1142 ext = &b->exten[4]; 1143 while (ext < end && *ext != 0xff) { 1144 u8 *opt = ext++; 1145 if (*opt == 0) /* Padding */ 1146 continue; 1147 ext += *ext + 1; 1148 if (ext < end) 1149 ic_do_bootp_ext(opt); 1150 } 1151 } 1152 1153 /* We have a winner! */ 1154 ic_dev = d; 1155 ic_myaddr = b->your_ip; 1156 ic_servaddr = b->server_ip; 1157 ic_addrservaddr = b->iph.saddr; 1158 if (ic_gateway == NONE && b->relay_ip) 1159 ic_gateway = b->relay_ip; 1160 if (ic_nameservers[0] == NONE) { 1161 ic_nameservers[0] = ic_servaddr; 1162 ic_nameservers_fallback = 1; 1163 } 1164 ic_got_reply = IC_BOOTP; 1165 1166 drop_unlock: 1167 /* Show's over. Nothing to see here. */ 1168 spin_unlock(&ic_recv_lock); 1169 1170 drop: 1171 /* Throw the packet out. */ 1172 kfree_skb(skb); 1173 1174 return 0; 1175 } 1176 1177 1178 #endif 1179 1180 1181 /* 1182 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1183 */ 1184 1185 #ifdef IPCONFIG_DYNAMIC 1186 1187 static int __init ic_dynamic(void) 1188 { 1189 int retries; 1190 struct ic_device *d; 1191 unsigned long start_jiffies, timeout, jiff; 1192 int do_bootp = ic_proto_have_if & IC_BOOTP; 1193 int do_rarp = ic_proto_have_if & IC_RARP; 1194 1195 /* 1196 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1197 * This routine gets only called when some pieces of information 1198 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1199 */ 1200 if (!ic_proto_enabled) { 1201 pr_err("IP-Config: Incomplete network configuration information\n"); 1202 return -1; 1203 } 1204 1205 #ifdef IPCONFIG_BOOTP 1206 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1207 pr_err("DHCP/BOOTP: No suitable device found\n"); 1208 #endif 1209 #ifdef IPCONFIG_RARP 1210 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1211 pr_err("RARP: No suitable device found\n"); 1212 #endif 1213 1214 if (!ic_proto_have_if) 1215 /* Error message already printed */ 1216 return -1; 1217 1218 /* 1219 * Setup protocols 1220 */ 1221 #ifdef IPCONFIG_BOOTP 1222 if (do_bootp) 1223 ic_bootp_init(); 1224 #endif 1225 #ifdef IPCONFIG_RARP 1226 if (do_rarp) 1227 ic_rarp_init(); 1228 #endif 1229 1230 /* 1231 * Send requests and wait, until we get an answer. This loop 1232 * seems to be a terrible waste of CPU time, but actually there is 1233 * only one process running at all, so we don't need to use any 1234 * scheduler functions. 1235 * [Actually we could now, but the nothing else running note still 1236 * applies.. - AC] 1237 */ 1238 pr_notice("Sending %s%s%s requests .", 1239 do_bootp 1240 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1241 (do_bootp && do_rarp) ? " and " : "", 1242 do_rarp ? "RARP" : ""); 1243 1244 start_jiffies = jiffies; 1245 d = ic_first_dev; 1246 retries = CONF_SEND_RETRIES; 1247 get_random_bytes(&timeout, sizeof(timeout)); 1248 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); 1249 for (;;) { 1250 #ifdef IPCONFIG_BOOTP 1251 if (do_bootp && (d->able & IC_BOOTP)) 1252 ic_bootp_send_if(d, jiffies - start_jiffies); 1253 #endif 1254 #ifdef IPCONFIG_RARP 1255 if (do_rarp && (d->able & IC_RARP)) 1256 ic_rarp_send_if(d); 1257 #endif 1258 1259 if (!d->next) { 1260 jiff = jiffies + timeout; 1261 while (time_before(jiffies, jiff) && !ic_got_reply) 1262 schedule_timeout_uninterruptible(1); 1263 } 1264 #ifdef IPCONFIG_DHCP 1265 /* DHCP isn't done until we get a DHCPACK. */ 1266 if ((ic_got_reply & IC_BOOTP) && 1267 (ic_proto_enabled & IC_USE_DHCP) && 1268 ic_dhcp_msgtype != DHCPACK) { 1269 ic_got_reply = 0; 1270 /* continue on device that got the reply */ 1271 d = ic_dev; 1272 pr_cont(","); 1273 continue; 1274 } 1275 #endif /* IPCONFIG_DHCP */ 1276 1277 if (ic_got_reply) { 1278 pr_cont(" OK\n"); 1279 break; 1280 } 1281 1282 if ((d = d->next)) 1283 continue; 1284 1285 if (! --retries) { 1286 pr_cont(" timed out!\n"); 1287 break; 1288 } 1289 1290 d = ic_first_dev; 1291 1292 timeout = timeout CONF_TIMEOUT_MULT; 1293 if (timeout > CONF_TIMEOUT_MAX) 1294 timeout = CONF_TIMEOUT_MAX; 1295 1296 pr_cont("."); 1297 } 1298 1299 #ifdef IPCONFIG_BOOTP 1300 if (do_bootp) 1301 ic_bootp_cleanup(); 1302 #endif 1303 #ifdef IPCONFIG_RARP 1304 if (do_rarp) 1305 ic_rarp_cleanup(); 1306 #endif 1307 1308 if (!ic_got_reply) { 1309 ic_myaddr = NONE; 1310 return -1; 1311 } 1312 1313 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n", 1314 ((ic_got_reply & IC_RARP) ? "RARP" 1315 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1316 &ic_addrservaddr, &ic_myaddr); 1317 1318 return 0; 1319 } 1320 1321 #endif /* IPCONFIG_DYNAMIC */ 1322 1323 #ifdef CONFIG_PROC_FS 1324 /* proc_dir_entry for /proc/net/ipconfig */ 1325 static struct proc_dir_entry *ipconfig_dir; 1326 1327 /* Name servers: */ 1328 static int pnp_seq_show(struct seq_file *seq, void *v) 1329 { 1330 int i; 1331 1332 if (ic_proto_used & IC_PROTO) 1333 seq_printf(seq, "#PROTO: %s\n", 1334 (ic_proto_used & IC_RARP) ? "RARP" 1335 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1336 else 1337 seq_puts(seq, "#MANUAL\n"); 1338 1339 if (ic_domain[0]) 1340 seq_printf(seq, 1341 "domain %s\n", ic_domain); 1342 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1343 if (ic_nameservers[i] != NONE) 1344 seq_printf(seq, "nameserver %pI4\n", 1345 &ic_nameservers[i]); 1346 } 1347 if (ic_servaddr != NONE) 1348 seq_printf(seq, "bootserver %pI4\n", 1349 &ic_servaddr); 1350 return 0; 1351 } 1352 1353 /* Create the /proc/net/ipconfig directory */ 1354 static int __init ipconfig_proc_net_init(void) 1355 { 1356 ipconfig_dir = proc_net_mkdir(&init_net, "ipconfig", init_net.proc_net); 1357 if (!ipconfig_dir) 1358 return -ENOMEM; 1359 1360 return 0; 1361 } 1362 1363 /* Create a new file under /proc/net/ipconfig */ 1364 static int ipconfig_proc_net_create(const char *name, 1365 const struct proc_ops *proc_ops) 1366 { 1367 char *pname; 1368 struct proc_dir_entry *p; 1369 1370 if (!ipconfig_dir) 1371 return -ENOMEM; 1372 1373 pname = kasprintf(GFP_KERNEL, "%s%s", "ipconfig/", name); 1374 if (!pname) 1375 return -ENOMEM; 1376 1377 p = proc_create(pname, 0444, init_net.proc_net, proc_ops); 1378 kfree(pname); 1379 if (!p) 1380 return -ENOMEM; 1381 1382 return 0; 1383 } 1384 1385 /* Write NTP server IP addresses to /proc/net/ipconfig/ntp_servers */ 1386 static int ntp_servers_show(struct seq_file *seq, void *v) 1387 { 1388 int i; 1389 1390 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) { 1391 if (ic_ntp_servers[i] != NONE) 1392 seq_printf(seq, "%pI4\n", &ic_ntp_servers[i]); 1393 } 1394 return 0; 1395 } 1396 DEFINE_PROC_SHOW_ATTRIBUTE(ntp_servers); 1397 #endif /* CONFIG_PROC_FS */ 1398 1399 /* 1400 * Extract IP address from the parameter string if needed. Note that we 1401 * need to have root_server_addr set _before_ IPConfig gets called as it 1402 * can override it. 1403 */ 1404 __be32 __init root_nfs_parse_addr(char *name) 1405 { 1406 __be32 addr; 1407 int octets = 0; 1408 char *cp, *cq; 1409 1410 cp = cq = name; 1411 while (octets < 4) { 1412 while (*cp >= '0' && *cp <= '9') 1413 cp++; 1414 if (cp == cq || cp - cq > 3) 1415 break; 1416 if (*cp == '.' || octets == 3) 1417 octets++; 1418 if (octets < 4) 1419 cp++; 1420 cq = cp; 1421 } 1422 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1423 if (*cp == ':') 1424 *cp++ = '\0'; 1425 addr = in_aton(name); 1426 memmove(name, cp, strlen(cp) + 1); 1427 } else 1428 addr = NONE; 1429 1430 return addr; 1431 } 1432 1433 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1434 1435 static int __init wait_for_devices(void) 1436 { 1437 int i; 1438 bool try_init_devs = true; 1439 1440 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1441 struct net_device *dev; 1442 int found = 0; 1443 1444 /* make sure deferred device probes are finished */ 1445 wait_for_device_probe(); 1446 1447 rtnl_lock(); 1448 for_each_netdev(&init_net, dev) { 1449 if (ic_is_init_dev(dev)) { 1450 found = 1; 1451 break; 1452 } 1453 } 1454 rtnl_unlock(); 1455 if (found) 1456 return 0; 1457 if (try_init_devs && 1458 (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) { 1459 try_init_devs = false; 1460 wait_for_init_devices_probe(); 1461 } 1462 ssleep(1); 1463 } 1464 return -ENODEV; 1465 } 1466 1467 /* 1468 * IP Autoconfig dispatcher. 1469 */ 1470 1471 static int __init ip_auto_config(void) 1472 { 1473 __be32 addr; 1474 #ifdef IPCONFIG_DYNAMIC 1475 int retries = CONF_OPEN_RETRIES; 1476 #endif 1477 int err; 1478 unsigned int i, count; 1479 1480 /* Initialise all name servers and NTP servers to NONE (but only if the 1481 * "ip=" or "nfsaddrs=" kernel command line parameters weren't decoded, 1482 * otherwise we'll overwrite the IP addresses specified there) 1483 */ 1484 if (ic_set_manually == 0) { 1485 ic_nameservers_predef(); 1486 ic_ntp_servers_predef(); 1487 } 1488 1489 #ifdef CONFIG_PROC_FS 1490 proc_create_single("pnp", 0444, init_net.proc_net, pnp_seq_show); 1491 1492 if (ipconfig_proc_net_init() == 0) 1493 ipconfig_proc_net_create("ntp_servers", &ntp_servers_proc_ops); 1494 #endif /* CONFIG_PROC_FS */ 1495 1496 if (!ic_enable) 1497 return 0; 1498 1499 pr_debug("IP-Config: Entered.\n"); 1500 #ifdef IPCONFIG_DYNAMIC 1501 try_try_again: 1502 #endif 1503 /* Wait for devices to appear */ 1504 err = wait_for_devices(); 1505 if (err) 1506 return err; 1507 1508 /* Setup all network devices */ 1509 err = ic_open_devs(); 1510 if (err) 1511 return err; 1512 1513 /* Give drivers a chance to settle */ 1514 msleep(CONF_POST_OPEN); 1515 1516 /* 1517 * If the config information is insufficient (e.g., our IP address or 1518 * IP address of the boot server is missing or we have multiple network 1519 * interfaces and no default was set), use BOOTP or RARP to get the 1520 * missing values. 1521 */ 1522 if (ic_myaddr == NONE || 1523 #if defined(CONFIG_ROOT_NFS) || defined(CONFIG_CIFS_ROOT) 1524 (root_server_addr == NONE && 1525 ic_servaddr == NONE && 1526 (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) || 1527 #endif 1528 ic_first_dev->next) { 1529 #ifdef IPCONFIG_DYNAMIC 1530 if (ic_dynamic() < 0) { 1531 ic_close_devs(); 1532 1533 /* 1534 * I don't know why, but sometimes the 1535 * eepro100 driver (at least) gets upset and 1536 * doesn't work the first time it's opened. 1537 * But then if you close it and reopen it, it 1538 * works just fine. So we need to try that at 1539 * least once before giving up. 1540 * 1541 * Also, if the root will be NFS-mounted, we 1542 * have nowhere to go if DHCP fails. So we 1543 * just have to keep trying forever. 1544 * 1545 * -- Chip 1546 */ 1547 #ifdef CONFIG_ROOT_NFS 1548 if (ROOT_DEV == Root_NFS) { 1549 pr_err("IP-Config: Retrying forever (NFS root)...\n"); 1550 goto try_try_again; 1551 } 1552 #endif 1553 #ifdef CONFIG_CIFS_ROOT 1554 if (ROOT_DEV == Root_CIFS) { 1555 pr_err("IP-Config: Retrying forever (CIFS root)...\n"); 1556 goto try_try_again; 1557 } 1558 #endif 1559 1560 if (--retries) { 1561 pr_err("IP-Config: Reopening network devices...\n"); 1562 goto try_try_again; 1563 } 1564 1565 /* Oh, well. At least we tried. */ 1566 pr_err("IP-Config: Auto-configuration of network failed\n"); 1567 return -1; 1568 } 1569 #else /* !DYNAMIC */ 1570 pr_err("IP-Config: Incomplete network configuration information\n"); 1571 ic_close_devs(); 1572 return -1; 1573 #endif /* IPCONFIG_DYNAMIC */ 1574 } else { 1575 /* Device selected manually or only one device -> use it */ 1576 ic_dev = ic_first_dev; 1577 } 1578 1579 addr = root_nfs_parse_addr(root_server_path); 1580 if (root_server_addr == NONE) 1581 root_server_addr = addr; 1582 1583 /* 1584 * Use defaults wherever applicable. 1585 */ 1586 if (ic_defaults() < 0) 1587 return -1; 1588 1589 /* 1590 * Record which protocol was actually used. 1591 */ 1592 #ifdef IPCONFIG_DYNAMIC 1593 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1594 #endif 1595 1596 #ifndef IPCONFIG_SILENT 1597 /* 1598 * Clue in the operator. 1599 */ 1600 pr_info("IP-Config: Complete:\n"); 1601 1602 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", 1603 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr, 1604 &ic_myaddr, &ic_netmask, &ic_gateway); 1605 pr_info(" host=%s, domain=%s, nis-domain=%s\n", 1606 utsname()->nodename, ic_domain, utsname()->domainname); 1607 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", 1608 &ic_servaddr, &root_server_addr, root_server_path); 1609 if (ic_dev_mtu) 1610 pr_cont(", mtu=%d", ic_dev_mtu); 1611 /* Name servers (if any): */ 1612 for (i = 0, count = 0; i < CONF_NAMESERVERS_MAX; i++) { 1613 if (ic_nameservers[i] != NONE) { 1614 if (i == 0) 1615 pr_info(" nameserver%u=%pI4", 1616 i, &ic_nameservers[i]); 1617 else 1618 pr_cont(", nameserver%u=%pI4", 1619 i, &ic_nameservers[i]); 1620 1621 count++; 1622 } 1623 if ((i + 1 == CONF_NAMESERVERS_MAX) && count > 0) 1624 pr_cont("\n"); 1625 } 1626 /* NTP servers (if any): */ 1627 for (i = 0, count = 0; i < CONF_NTP_SERVERS_MAX; i++) { 1628 if (ic_ntp_servers[i] != NONE) { 1629 if (i == 0) 1630 pr_info(" ntpserver%u=%pI4", 1631 i, &ic_ntp_servers[i]); 1632 else 1633 pr_cont(", ntpserver%u=%pI4", 1634 i, &ic_ntp_servers[i]); 1635 1636 count++; 1637 } 1638 if ((i + 1 == CONF_NTP_SERVERS_MAX) && count > 0) 1639 pr_cont("\n"); 1640 } 1641 #endif /* !SILENT */ 1642 1643 /* 1644 * Close all network devices except the device we've 1645 * autoconfigured and set up routes. 1646 */ 1647 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1648 err = -1; 1649 else 1650 err = 0; 1651 1652 ic_close_devs(); 1653 1654 return err; 1655 } 1656 1657 late_initcall(ip_auto_config); 1658 1659 1660 /* 1661 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1662 * command line parameter. See Documentation/admin-guide/nfs/nfsroot.rst. 1663 */ 1664 static int __init ic_proto_name(char *name) 1665 { 1666 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1667 return 1; 1668 } 1669 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1670 return 0; 1671 } 1672 #ifdef CONFIG_IP_PNP_DHCP 1673 else if (!strncmp(name, "dhcp", 4)) { 1674 char *client_id; 1675 1676 ic_proto_enabled &= ~IC_RARP; 1677 client_id = strstr(name, "dhcp,"); 1678 if (client_id) { 1679 char *v; 1680 1681 client_id = client_id + 5; 1682 v = strchr(client_id, ','); 1683 if (!v) 1684 return 1; 1685 *v = 0; 1686 if (kstrtou8(client_id, 0, dhcp_client_identifier)) 1687 pr_debug("DHCP: Invalid client identifier type\n"); 1688 strscpy(dhcp_client_identifier + 1, v + 1, 1689 sizeof(dhcp_client_identifier) - 1); 1690 *v = ','; 1691 } 1692 return 1; 1693 } 1694 #endif 1695 #ifdef CONFIG_IP_PNP_BOOTP 1696 else if (!strcmp(name, "bootp")) { 1697 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1698 return 1; 1699 } 1700 #endif 1701 #ifdef CONFIG_IP_PNP_RARP 1702 else if (!strcmp(name, "rarp")) { 1703 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1704 return 1; 1705 } 1706 #endif 1707 #ifdef IPCONFIG_DYNAMIC 1708 else if (!strcmp(name, "both")) { 1709 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1710 return 1; 1711 } 1712 #endif 1713 return 0; 1714 } 1715 1716 static int __init ip_auto_config_setup(char *addrs) 1717 { 1718 char *cp, *ip, *dp; 1719 int num = 0; 1720 1721 ic_set_manually = 1; 1722 ic_enable = 1; 1723 1724 /* 1725 * If any dhcp, bootp etc options are set, leave autoconfig on 1726 * and skip the below static IP processing. 1727 */ 1728 if (ic_proto_name(addrs)) 1729 return 1; 1730 1731 /* If no static IP is given, turn off autoconfig and bail. */ 1732 if (*addrs == 0 || 1733 strcmp(addrs, "off") == 0 || 1734 strcmp(addrs, "none") == 0) { 1735 ic_enable = 0; 1736 return 1; 1737 } 1738 1739 /* Initialise all name servers and NTP servers to NONE */ 1740 ic_nameservers_predef(); 1741 ic_ntp_servers_predef(); 1742 1743 /* Parse string for static IP assignment. */ 1744 ip = addrs; 1745 while (ip && *ip) { 1746 if ((cp = strchr(ip, ':'))) 1747 *cp++ = '\0'; 1748 if (strlen(ip) > 0) { 1749 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip); 1750 switch (num) { 1751 case 0: 1752 if ((ic_myaddr = in_aton(ip)) == ANY) 1753 ic_myaddr = NONE; 1754 break; 1755 case 1: 1756 if ((ic_servaddr = in_aton(ip)) == ANY) 1757 ic_servaddr = NONE; 1758 break; 1759 case 2: 1760 if ((ic_gateway = in_aton(ip)) == ANY) 1761 ic_gateway = NONE; 1762 break; 1763 case 3: 1764 if ((ic_netmask = in_aton(ip)) == ANY) 1765 ic_netmask = NONE; 1766 break; 1767 case 4: 1768 if ((dp = strchr(ip, '.'))) { 1769 *dp++ = '\0'; 1770 strscpy(utsname()->domainname, dp, 1771 sizeof(utsname()->domainname)); 1772 } 1773 strscpy(utsname()->nodename, ip, 1774 sizeof(utsname()->nodename)); 1775 ic_host_name_set = 1; 1776 break; 1777 case 5: 1778 strscpy(user_dev_name, ip, sizeof(user_dev_name)); 1779 break; 1780 case 6: 1781 if (ic_proto_name(ip) == 0 && 1782 ic_myaddr == NONE) { 1783 ic_enable = 0; 1784 } 1785 break; 1786 case 7: 1787 if (CONF_NAMESERVERS_MAX >= 1) { 1788 ic_nameservers[0] = in_aton(ip); 1789 if (ic_nameservers[0] == ANY) 1790 ic_nameservers[0] = NONE; 1791 } 1792 break; 1793 case 8: 1794 if (CONF_NAMESERVERS_MAX >= 2) { 1795 ic_nameservers[1] = in_aton(ip); 1796 if (ic_nameservers[1] == ANY) 1797 ic_nameservers[1] = NONE; 1798 } 1799 break; 1800 case 9: 1801 if (CONF_NTP_SERVERS_MAX >= 1) { 1802 ic_ntp_servers[0] = in_aton(ip); 1803 if (ic_ntp_servers[0] == ANY) 1804 ic_ntp_servers[0] = NONE; 1805 } 1806 break; 1807 } 1808 } 1809 ip = cp; 1810 num++; 1811 } 1812 1813 return 1; 1814 } 1815 __setup("ip=", ip_auto_config_setup); 1816 1817 static int __init nfsaddrs_config_setup(char *addrs) 1818 { 1819 return ip_auto_config_setup(addrs); 1820 } 1821 __setup("nfsaddrs=", nfsaddrs_config_setup); 1822 1823 static int __init vendor_class_identifier_setup(char *addrs) 1824 { 1825 if (strscpy(vendor_class_identifier, addrs, 1826 sizeof(vendor_class_identifier)) 1827 >= sizeof(vendor_class_identifier)) 1828 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n", 1829 vendor_class_identifier); 1830 return 1; 1831 } 1832 __setup("dhcpclass=", vendor_class_identifier_setup); 1833 1834 static int __init set_carrier_timeout(char *str) 1835 { 1836 ssize_t ret; 1837 1838 if (!str) 1839 return 0; 1840 1841 ret = kstrtouint(str, 0, &carrier_timeout); 1842 if (ret) 1843 return 0; 1844 1845 return 1; 1846 } 1847 __setup("carrier_timeout=", set_carrier_timeout); 1848