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 ic_first_dev = NULL; 351 ic_dev = NULL; 352 } 353 354 /* 355 * Interface to various network functions. 356 */ 357 358 static inline void 359 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 360 { 361 sin->sin_family = AF_INET; 362 sin->sin_addr.s_addr = addr; 363 sin->sin_port = port; 364 } 365 366 /* 367 * Set up interface addresses and routes. 368 */ 369 370 static int __init ic_setup_if(void) 371 { 372 struct ifreq ir; 373 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 374 int err; 375 376 memset(&ir, 0, sizeof(ir)); 377 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name); 378 set_sockaddr(sin, ic_myaddr, 0); 379 if ((err = devinet_ioctl(&init_net, SIOCSIFADDR, &ir)) < 0) { 380 pr_err("IP-Config: Unable to set interface address (%d)\n", 381 err); 382 return -1; 383 } 384 set_sockaddr(sin, ic_netmask, 0); 385 if ((err = devinet_ioctl(&init_net, SIOCSIFNETMASK, &ir)) < 0) { 386 pr_err("IP-Config: Unable to set interface netmask (%d)\n", 387 err); 388 return -1; 389 } 390 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 391 if ((err = devinet_ioctl(&init_net, SIOCSIFBRDADDR, &ir)) < 0) { 392 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n", 393 err); 394 return -1; 395 } 396 /* Handle the case where we need non-standard MTU on the boot link (a network 397 * using jumbo frames, for instance). If we can't set the mtu, don't error 398 * out, we'll try to muddle along. 399 */ 400 if (ic_dev_mtu != 0) { 401 rtnl_lock(); 402 if ((err = dev_set_mtu(ic_dev->dev, ic_dev_mtu)) < 0) 403 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", 404 ic_dev_mtu, err); 405 rtnl_unlock(); 406 } 407 return 0; 408 } 409 410 static int __init ic_setup_routes(void) 411 { 412 /* No need to setup device routes, only the default route... */ 413 414 if (ic_gateway != NONE) { 415 struct rtentry rm; 416 int err; 417 418 memset(&rm, 0, sizeof(rm)); 419 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 420 pr_err("IP-Config: Gateway not on directly connected network\n"); 421 return -1; 422 } 423 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 424 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 425 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 426 rm.rt_flags = RTF_UP | RTF_GATEWAY; 427 if ((err = ip_rt_ioctl(&init_net, SIOCADDRT, &rm)) < 0) { 428 pr_err("IP-Config: Cannot add default route (%d)\n", 429 err); 430 return -1; 431 } 432 } 433 434 return 0; 435 } 436 437 /* 438 * Fill in default values for all missing parameters. 439 */ 440 441 static int __init ic_defaults(void) 442 { 443 /* 444 * At this point we have no userspace running so need not 445 * claim locks on system_utsname 446 */ 447 448 if (!ic_host_name_set) 449 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 450 451 if (root_server_addr == NONE) 452 root_server_addr = ic_servaddr; 453 454 if (ic_netmask == NONE) { 455 if (IN_CLASSA(ntohl(ic_myaddr))) 456 ic_netmask = htonl(IN_CLASSA_NET); 457 else if (IN_CLASSB(ntohl(ic_myaddr))) 458 ic_netmask = htonl(IN_CLASSB_NET); 459 else if (IN_CLASSC(ntohl(ic_myaddr))) 460 ic_netmask = htonl(IN_CLASSC_NET); 461 else if (IN_CLASSE(ntohl(ic_myaddr))) 462 ic_netmask = htonl(IN_CLASSE_NET); 463 else { 464 pr_err("IP-Config: Unable to guess netmask for address %pI4\n", 465 &ic_myaddr); 466 return -1; 467 } 468 pr_notice("IP-Config: Guessing netmask %pI4\n", 469 &ic_netmask); 470 } 471 472 return 0; 473 } 474 475 /* 476 * RARP support. 477 */ 478 479 #ifdef IPCONFIG_RARP 480 481 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 482 483 static struct packet_type rarp_packet_type __initdata = { 484 .type = cpu_to_be16(ETH_P_RARP), 485 .func = ic_rarp_recv, 486 }; 487 488 static inline void __init ic_rarp_init(void) 489 { 490 dev_add_pack(&rarp_packet_type); 491 } 492 493 static inline void __init ic_rarp_cleanup(void) 494 { 495 dev_remove_pack(&rarp_packet_type); 496 } 497 498 /* 499 * Process received RARP packet. 500 */ 501 static int __init 502 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 503 { 504 struct arphdr *rarp; 505 unsigned char *rarp_ptr; 506 __be32 sip, tip; 507 unsigned char *tha; /* t for "target" */ 508 struct ic_device *d; 509 510 if (!net_eq(dev_net(dev), &init_net)) 511 goto drop; 512 513 skb = skb_share_check(skb, GFP_ATOMIC); 514 if (!skb) 515 return NET_RX_DROP; 516 517 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 518 goto drop; 519 520 /* Basic sanity checks can be done without the lock. */ 521 rarp = (struct arphdr *)skb_transport_header(skb); 522 523 /* If this test doesn't pass, it's not IP, or we should 524 * ignore it anyway. 525 */ 526 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 527 goto drop; 528 529 /* If it's not a RARP reply, delete it. */ 530 if (rarp->ar_op != htons(ARPOP_RREPLY)) 531 goto drop; 532 533 /* If it's not Ethernet, delete it. */ 534 if (rarp->ar_pro != htons(ETH_P_IP)) 535 goto drop; 536 537 if (!pskb_may_pull(skb, arp_hdr_len(dev))) 538 goto drop; 539 540 /* OK, it is all there and looks valid, process... */ 541 rarp = (struct arphdr *)skb_transport_header(skb); 542 rarp_ptr = (unsigned char *) (rarp + 1); 543 544 /* One reply at a time, please. */ 545 spin_lock(&ic_recv_lock); 546 547 /* If we already have a reply, just drop the packet */ 548 if (ic_got_reply) 549 goto drop_unlock; 550 551 /* Find the ic_device that the packet arrived on */ 552 d = ic_first_dev; 553 while (d && d->dev != dev) 554 d = d->next; 555 if (!d) 556 goto drop_unlock; /* should never happen */ 557 558 /* Extract variable-width fields */ 559 rarp_ptr += dev->addr_len; 560 memcpy(&sip, rarp_ptr, 4); 561 rarp_ptr += 4; 562 tha = rarp_ptr; 563 rarp_ptr += dev->addr_len; 564 memcpy(&tip, rarp_ptr, 4); 565 566 /* Discard packets which are not meant for us. */ 567 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 568 goto drop_unlock; 569 570 /* Discard packets which are not from specified server. */ 571 if (ic_servaddr != NONE && ic_servaddr != sip) 572 goto drop_unlock; 573 574 /* We have a winner! */ 575 ic_dev = d; 576 if (ic_myaddr == NONE) 577 ic_myaddr = tip; 578 ic_servaddr = sip; 579 ic_addrservaddr = sip; 580 ic_got_reply = IC_RARP; 581 582 drop_unlock: 583 /* Show's over. Nothing to see here. */ 584 spin_unlock(&ic_recv_lock); 585 586 drop: 587 /* Throw the packet out. */ 588 kfree_skb(skb); 589 return 0; 590 } 591 592 593 /* 594 * Send RARP request packet over a single interface. 595 */ 596 static void __init ic_rarp_send_if(struct ic_device *d) 597 { 598 struct net_device *dev = d->dev; 599 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 600 dev->dev_addr, dev->dev_addr); 601 } 602 #endif 603 604 /* 605 * Predefine Nameservers 606 */ 607 static inline void __init ic_nameservers_predef(void) 608 { 609 int i; 610 611 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 612 ic_nameservers[i] = NONE; 613 } 614 615 /* Predefine NTP servers */ 616 static inline void __init ic_ntp_servers_predef(void) 617 { 618 int i; 619 620 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) 621 ic_ntp_servers[i] = NONE; 622 } 623 624 /* 625 * DHCP/BOOTP support. 626 */ 627 628 #ifdef IPCONFIG_BOOTP 629 630 struct bootp_pkt { /* BOOTP packet format */ 631 struct iphdr iph; /* IP header */ 632 struct udphdr udph; /* UDP header */ 633 u8 op; /* 1=request, 2=reply */ 634 u8 htype; /* HW address type */ 635 u8 hlen; /* HW address length */ 636 u8 hops; /* Used only by gateways */ 637 __be32 xid; /* Transaction ID */ 638 __be16 secs; /* Seconds since we started */ 639 __be16 flags; /* Just what it says */ 640 __be32 client_ip; /* Client's IP address if known */ 641 __be32 your_ip; /* Assigned IP address */ 642 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 643 __be32 relay_ip; /* IP address of BOOTP relay */ 644 u8 hw_addr[16]; /* Client's HW address */ 645 u8 serv_name[64]; /* Server host name */ 646 u8 boot_file[128]; /* Name of boot file */ 647 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 648 }; 649 650 /* packet ops */ 651 #define BOOTP_REQUEST 1 652 #define BOOTP_REPLY 2 653 654 /* DHCP message types */ 655 #define DHCPDISCOVER 1 656 #define DHCPOFFER 2 657 #define DHCPREQUEST 3 658 #define DHCPDECLINE 4 659 #define DHCPACK 5 660 #define DHCPNAK 6 661 #define DHCPRELEASE 7 662 #define DHCPINFORM 8 663 664 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 665 666 static struct packet_type bootp_packet_type __initdata = { 667 .type = cpu_to_be16(ETH_P_IP), 668 .func = ic_bootp_recv, 669 }; 670 671 /* DHCPACK can overwrite DNS if fallback was set upon first BOOTP reply */ 672 static int ic_nameservers_fallback __initdata; 673 674 /* 675 * Initialize DHCP/BOOTP extension fields in the request. 676 */ 677 678 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 679 680 #ifdef IPCONFIG_DHCP 681 682 static bool __init 683 ic_dhcp_add_option(u8 **options, const u8 *end, u8 type, const void *value, 684 int len) 685 { 686 u8 *e = *options; 687 688 /* leave room for the option header and the END marker */ 689 if (len > U8_MAX || end - e < len + 3) 690 return false; 691 692 *e++ = type; 693 *e++ = len; 694 memcpy(e, value, len); 695 *options = e + len; 696 697 return true; 698 } 699 700 static void __init 701 ic_dhcp_init_options(u8 *options, struct ic_device *d) 702 { 703 static const u8 ic_req_params[] = { 704 1, /* Subnet mask */ 705 3, /* Default gateway */ 706 6, /* DNS server */ 707 12, /* Host name */ 708 15, /* Domain name */ 709 17, /* Boot path */ 710 26, /* MTU */ 711 40, /* NIS domain name */ 712 42, /* NTP servers */ 713 }; 714 u8 mt = (ic_servaddr == NONE) ? DHCPDISCOVER : DHCPREQUEST; 715 u8 *end = options + sizeof(((struct bootp_pkt *)0)->exten); 716 u8 *e = options; 717 int len; 718 719 pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name); 720 721 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 722 e += 4; 723 724 *e++ = 53; /* DHCP message type */ 725 *e++ = 1; 726 *e++ = mt; 727 728 if (mt == DHCPREQUEST) { 729 *e++ = 54; /* Server ID (IP address) */ 730 *e++ = 4; 731 memcpy(e, &ic_servaddr, 4); 732 e += 4; 733 734 *e++ = 50; /* Requested IP address */ 735 *e++ = 4; 736 memcpy(e, &ic_myaddr, 4); 737 e += 4; 738 } 739 740 *e++ = 55; /* Parameter request list */ 741 *e++ = sizeof(ic_req_params); 742 memcpy(e, ic_req_params, sizeof(ic_req_params)); 743 e += sizeof(ic_req_params); 744 745 if (ic_host_name_set) { 746 len = strlen(utsname()->nodename); 747 ic_dhcp_add_option(&e, end, 12, utsname()->nodename, len); 748 } 749 if (*vendor_class_identifier) { 750 len = strlen(vendor_class_identifier); 751 if (ic_dhcp_add_option(&e, end, 60, vendor_class_identifier, len)) 752 pr_info("DHCP: sending class identifier \"%s\"\n", 753 vendor_class_identifier); 754 } 755 len = strlen(dhcp_client_identifier + 1); 756 /* the minimum length of identifier is 2, include 1 byte type */ 757 if (len >= 1) 758 ic_dhcp_add_option(&e, end, 61, dhcp_client_identifier, len + 1); 759 760 *e++ = 255; /* End of the list */ 761 } 762 763 #endif /* IPCONFIG_DHCP */ 764 765 static void __init ic_bootp_init_ext(u8 *e) 766 { 767 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 768 e += 4; 769 *e++ = 1; /* Subnet mask request */ 770 *e++ = 4; 771 e += 4; 772 *e++ = 3; /* Default gateway request */ 773 *e++ = 4; 774 e += 4; 775 #if CONF_NAMESERVERS_MAX > 0 776 *e++ = 6; /* (DNS) name server request */ 777 *e++ = 4 * CONF_NAMESERVERS_MAX; 778 e += 4 * CONF_NAMESERVERS_MAX; 779 #endif 780 *e++ = 12; /* Host name request */ 781 *e++ = 32; 782 e += 32; 783 *e++ = 40; /* NIS Domain name request */ 784 *e++ = 32; 785 e += 32; 786 *e++ = 17; /* Boot path */ 787 *e++ = 40; 788 e += 40; 789 790 *e++ = 57; /* set extension buffer size for reply */ 791 *e++ = 2; 792 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 793 *e++ = 150; 794 795 *e++ = 255; /* End of the list */ 796 } 797 798 799 /* 800 * Initialize the DHCP/BOOTP mechanism. 801 */ 802 static inline void __init ic_bootp_init(void) 803 { 804 /* Re-initialise all name servers and NTP servers to NONE, in case any 805 * were set via the "ip=" or "nfsaddrs=" kernel command line parameters: 806 * any IP addresses specified there will already have been decoded but 807 * are no longer needed 808 */ 809 ic_nameservers_predef(); 810 ic_ntp_servers_predef(); 811 812 dev_add_pack(&bootp_packet_type); 813 } 814 815 816 /* 817 * DHCP/BOOTP cleanup. 818 */ 819 static inline void __init ic_bootp_cleanup(void) 820 { 821 dev_remove_pack(&bootp_packet_type); 822 } 823 824 825 /* 826 * Send DHCP/BOOTP request to single interface. 827 */ 828 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 829 { 830 struct net_device *dev = d->dev; 831 struct sk_buff *skb; 832 struct bootp_pkt *b; 833 struct iphdr *h; 834 int hlen = LL_RESERVED_SPACE(dev); 835 int tlen = dev->needed_tailroom; 836 837 /* Allocate packet */ 838 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, 839 GFP_KERNEL); 840 if (!skb) 841 return; 842 skb_reserve(skb, hlen); 843 b = skb_put_zero(skb, sizeof(struct bootp_pkt)); 844 845 /* Construct IP header */ 846 skb_reset_network_header(skb); 847 h = ip_hdr(skb); 848 h->version = 4; 849 h->ihl = 5; 850 h->tot_len = htons(sizeof(struct bootp_pkt)); 851 h->frag_off = htons(IP_DF); 852 h->ttl = 64; 853 h->protocol = IPPROTO_UDP; 854 h->daddr = htonl(INADDR_BROADCAST); 855 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 856 857 /* Construct UDP header */ 858 b->udph.source = htons(68); 859 b->udph.dest = htons(67); 860 udp_set_len_short(&b->udph, sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 861 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 862 863 /* Construct DHCP/BOOTP header */ 864 b->op = BOOTP_REQUEST; 865 if (dev->type < 256) /* check for false types */ 866 b->htype = dev->type; 867 else if (dev->type == ARPHRD_FDDI) 868 b->htype = ARPHRD_ETHER; 869 else { 870 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type, 871 dev->name); 872 b->htype = dev->type; /* can cause undefined behavior */ 873 } 874 875 /* server_ip and your_ip address are both already zero per RFC2131 */ 876 b->hlen = dev->addr_len; 877 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 878 b->secs = htons(jiffies_diff / HZ); 879 b->xid = d->xid; 880 881 /* add DHCP options or BOOTP extensions */ 882 #ifdef IPCONFIG_DHCP 883 if (ic_proto_enabled & IC_USE_DHCP) 884 ic_dhcp_init_options(b->exten, d); 885 else 886 #endif 887 ic_bootp_init_ext(b->exten); 888 889 /* Chain packet down the line... */ 890 skb->dev = dev; 891 skb->protocol = htons(ETH_P_IP); 892 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 893 dev->broadcast, dev->dev_addr, skb->len) < 0) { 894 kfree_skb(skb); 895 printk("E"); 896 return; 897 } 898 899 if (dev_queue_xmit(skb) < 0) 900 printk("E"); 901 } 902 903 904 /* 905 * Copy BOOTP-supplied string 906 */ 907 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 908 { 909 if (!len) 910 return 0; 911 if (len > max-1) 912 len = max-1; 913 memcpy(dest, src, len); 914 dest[len] = '\0'; 915 return 1; 916 } 917 918 919 /* 920 * Process BOOTP extensions. 921 */ 922 static void __init ic_do_bootp_ext(u8 *ext) 923 { 924 u8 servers; 925 int i; 926 __be16 mtu; 927 928 u8 *c; 929 930 pr_debug("DHCP/BOOTP: Got extension %d:", *ext); 931 for (c=ext+2; c<ext+2+ext[1]; c++) 932 pr_debug(" %02x", *c); 933 pr_debug("\n"); 934 935 switch (*ext++) { 936 case 1: /* Subnet mask */ 937 if (ic_netmask == NONE) 938 memcpy(&ic_netmask, ext+1, 4); 939 break; 940 case 3: /* Default gateway */ 941 if (ic_gateway == NONE) 942 memcpy(&ic_gateway, ext+1, 4); 943 break; 944 case 6: /* DNS server */ 945 servers= *ext/4; 946 if (servers > CONF_NAMESERVERS_MAX) 947 servers = CONF_NAMESERVERS_MAX; 948 for (i = 0; i < servers; i++) { 949 if (ic_nameservers[i] == NONE || 950 ic_nameservers_fallback) 951 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 952 } 953 break; 954 case 12: /* Host name */ 955 if (!ic_host_name_set) { 956 ic_bootp_string(utsname()->nodename, ext+1, *ext, 957 __NEW_UTS_LEN); 958 ic_host_name_set = 1; 959 } 960 break; 961 case 15: /* Domain name (DNS) */ 962 if (!ic_domain[0]) 963 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 964 break; 965 case 17: /* Root path */ 966 if (!root_server_path[0]) 967 ic_bootp_string(root_server_path, ext+1, *ext, 968 sizeof(root_server_path)); 969 break; 970 case 26: /* Interface MTU */ 971 memcpy(&mtu, ext+1, sizeof(mtu)); 972 ic_dev_mtu = ntohs(mtu); 973 break; 974 case 40: /* NIS Domain name (_not_ DNS) */ 975 ic_bootp_string(utsname()->domainname, ext+1, *ext, 976 __NEW_UTS_LEN); 977 break; 978 case 42: /* NTP servers */ 979 servers = *ext / 4; 980 if (servers > CONF_NTP_SERVERS_MAX) 981 servers = CONF_NTP_SERVERS_MAX; 982 for (i = 0; i < servers; i++) { 983 if (ic_ntp_servers[i] == NONE) 984 memcpy(&ic_ntp_servers[i], ext+1+4*i, 4); 985 } 986 break; 987 } 988 } 989 990 991 /* 992 * Receive BOOTP reply. 993 */ 994 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 995 { 996 struct bootp_pkt *b; 997 struct iphdr *h; 998 struct ic_device *d; 999 int len, ext_len; 1000 1001 if (!net_eq(dev_net(dev), &init_net)) 1002 goto drop; 1003 1004 /* Perform verifications before taking the lock. */ 1005 if (skb->pkt_type == PACKET_OTHERHOST) 1006 goto drop; 1007 1008 skb = skb_share_check(skb, GFP_ATOMIC); 1009 if (!skb) 1010 return NET_RX_DROP; 1011 1012 if (!pskb_may_pull(skb, 1013 sizeof(struct iphdr) + 1014 sizeof(struct udphdr))) 1015 goto drop; 1016 1017 b = (struct bootp_pkt *)skb_network_header(skb); 1018 h = &b->iph; 1019 1020 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 1021 goto drop; 1022 1023 /* Fragments are not supported */ 1024 if (ip_is_fragment(h)) { 1025 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); 1026 goto drop; 1027 } 1028 1029 if (skb->len < ntohs(h->tot_len)) 1030 goto drop; 1031 1032 if (ip_fast_csum((char *) h, h->ihl)) 1033 goto drop; 1034 1035 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 1036 goto drop; 1037 1038 if (ntohs(h->tot_len) < udp_get_len_short(&b->udph) + sizeof(struct iphdr)) 1039 goto drop; 1040 1041 len = udp_get_len_short(&b->udph) - sizeof(struct udphdr); 1042 ext_len = len - (sizeof(*b) - 1043 sizeof(struct iphdr) - 1044 sizeof(struct udphdr) - 1045 sizeof(b->exten)); 1046 if (ext_len < 0) 1047 goto drop; 1048 1049 /* Ok the front looks good, make sure we can get at the rest. */ 1050 if (!pskb_may_pull(skb, skb->len)) 1051 goto drop; 1052 1053 b = (struct bootp_pkt *)skb_network_header(skb); 1054 h = &b->iph; 1055 1056 /* One reply at a time, please. */ 1057 spin_lock(&ic_recv_lock); 1058 1059 /* If we already have a reply, just drop the packet */ 1060 if (ic_got_reply) 1061 goto drop_unlock; 1062 1063 /* Find the ic_device that the packet arrived on */ 1064 d = ic_first_dev; 1065 while (d && d->dev != dev) 1066 d = d->next; 1067 if (!d) 1068 goto drop_unlock; /* should never happen */ 1069 1070 /* Is it a reply to our BOOTP request? */ 1071 if (b->op != BOOTP_REPLY || 1072 b->xid != d->xid) { 1073 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n", 1074 d->dev->name, b->op, b->xid); 1075 goto drop_unlock; 1076 } 1077 1078 /* Parse extensions */ 1079 if (ext_len >= 4 && 1080 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1081 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1082 u8 *ext; 1083 1084 #ifdef IPCONFIG_DHCP 1085 if (ic_proto_enabled & IC_USE_DHCP) { 1086 __be32 server_id = NONE; 1087 int mt = 0; 1088 1089 ext = &b->exten[4]; 1090 while (ext < end && *ext != 0xff) { 1091 u8 *opt = ext++; 1092 if (*opt == 0) /* Padding */ 1093 continue; 1094 ext += *ext + 1; 1095 if (ext >= end) 1096 break; 1097 switch (*opt) { 1098 case 53: /* Message type */ 1099 if (opt[1]) 1100 mt = opt[2]; 1101 break; 1102 case 54: /* Server ID (IP address) */ 1103 if (opt[1] >= 4) 1104 memcpy(&server_id, opt + 2, 4); 1105 break; 1106 } 1107 } 1108 1109 pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name); 1110 1111 switch (mt) { 1112 case DHCPOFFER: 1113 /* While in the process of accepting one offer, 1114 * ignore all others. 1115 */ 1116 if (ic_myaddr != NONE) 1117 goto drop_unlock; 1118 1119 /* Let's accept that offer. */ 1120 ic_myaddr = b->your_ip; 1121 ic_servaddr = server_id; 1122 pr_debug("DHCP: Offered address %pI4 by server %pI4\n", 1123 &ic_myaddr, &b->iph.saddr); 1124 /* The DHCP indicated server address takes 1125 * precedence over the bootp header one if 1126 * they are different. 1127 */ 1128 if ((server_id != NONE) && 1129 (b->server_ip != server_id)) 1130 b->server_ip = ic_servaddr; 1131 break; 1132 1133 case DHCPACK: 1134 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1135 goto drop_unlock; 1136 1137 /* Yeah! */ 1138 break; 1139 1140 default: 1141 /* Urque. Forget it*/ 1142 ic_myaddr = NONE; 1143 ic_servaddr = NONE; 1144 goto drop_unlock; 1145 } 1146 1147 ic_dhcp_msgtype = mt; 1148 1149 } 1150 #endif /* IPCONFIG_DHCP */ 1151 1152 ext = &b->exten[4]; 1153 while (ext < end && *ext != 0xff) { 1154 u8 *opt = ext++; 1155 if (*opt == 0) /* Padding */ 1156 continue; 1157 ext += *ext + 1; 1158 if (ext < end) 1159 ic_do_bootp_ext(opt); 1160 } 1161 } 1162 1163 /* We have a winner! */ 1164 ic_dev = d; 1165 ic_myaddr = b->your_ip; 1166 ic_servaddr = b->server_ip; 1167 ic_addrservaddr = b->iph.saddr; 1168 if (ic_gateway == NONE && b->relay_ip) 1169 ic_gateway = b->relay_ip; 1170 if (ic_nameservers[0] == NONE) { 1171 ic_nameservers[0] = ic_servaddr; 1172 ic_nameservers_fallback = 1; 1173 } 1174 ic_got_reply = IC_BOOTP; 1175 1176 drop_unlock: 1177 /* Show's over. Nothing to see here. */ 1178 spin_unlock(&ic_recv_lock); 1179 1180 drop: 1181 /* Throw the packet out. */ 1182 kfree_skb(skb); 1183 1184 return 0; 1185 } 1186 1187 1188 #endif 1189 1190 1191 /* 1192 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1193 */ 1194 1195 #ifdef IPCONFIG_DYNAMIC 1196 1197 static int __init ic_dynamic(void) 1198 { 1199 int retries; 1200 struct ic_device *d; 1201 unsigned long start_jiffies, timeout, jiff; 1202 int do_bootp = ic_proto_have_if & IC_BOOTP; 1203 int do_rarp = ic_proto_have_if & IC_RARP; 1204 1205 /* 1206 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1207 * This routine gets only called when some pieces of information 1208 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1209 */ 1210 if (!ic_proto_enabled) { 1211 pr_err("IP-Config: Incomplete network configuration information\n"); 1212 return -1; 1213 } 1214 1215 #ifdef IPCONFIG_BOOTP 1216 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1217 pr_err("DHCP/BOOTP: No suitable device found\n"); 1218 #endif 1219 #ifdef IPCONFIG_RARP 1220 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1221 pr_err("RARP: No suitable device found\n"); 1222 #endif 1223 1224 if (!ic_proto_have_if) 1225 /* Error message already printed */ 1226 return -1; 1227 1228 /* 1229 * Setup protocols 1230 */ 1231 #ifdef IPCONFIG_BOOTP 1232 if (do_bootp) 1233 ic_bootp_init(); 1234 #endif 1235 #ifdef IPCONFIG_RARP 1236 if (do_rarp) 1237 ic_rarp_init(); 1238 #endif 1239 1240 /* 1241 * Send requests and wait, until we get an answer. This loop 1242 * seems to be a terrible waste of CPU time, but actually there is 1243 * only one process running at all, so we don't need to use any 1244 * scheduler functions. 1245 * [Actually we could now, but the nothing else running note still 1246 * applies.. - AC] 1247 */ 1248 pr_notice("Sending %s%s%s requests .", 1249 do_bootp 1250 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1251 (do_bootp && do_rarp) ? " and " : "", 1252 do_rarp ? "RARP" : ""); 1253 1254 start_jiffies = jiffies; 1255 d = ic_first_dev; 1256 retries = CONF_SEND_RETRIES; 1257 get_random_bytes(&timeout, sizeof(timeout)); 1258 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); 1259 for (;;) { 1260 #ifdef IPCONFIG_BOOTP 1261 if (do_bootp && (d->able & IC_BOOTP)) 1262 ic_bootp_send_if(d, jiffies - start_jiffies); 1263 #endif 1264 #ifdef IPCONFIG_RARP 1265 if (do_rarp && (d->able & IC_RARP)) 1266 ic_rarp_send_if(d); 1267 #endif 1268 1269 if (!d->next) { 1270 jiff = jiffies + timeout; 1271 while (time_before(jiffies, jiff) && !ic_got_reply) 1272 schedule_timeout_uninterruptible(1); 1273 } 1274 #ifdef IPCONFIG_DHCP 1275 /* DHCP isn't done until we get a DHCPACK. */ 1276 if ((ic_got_reply & IC_BOOTP) && 1277 (ic_proto_enabled & IC_USE_DHCP) && 1278 ic_dhcp_msgtype != DHCPACK) { 1279 ic_got_reply = 0; 1280 /* continue on device that got the reply */ 1281 d = ic_dev; 1282 pr_cont(","); 1283 continue; 1284 } 1285 #endif /* IPCONFIG_DHCP */ 1286 1287 if (ic_got_reply) { 1288 pr_cont(" OK\n"); 1289 break; 1290 } 1291 1292 if ((d = d->next)) 1293 continue; 1294 1295 if (! --retries) { 1296 pr_cont(" timed out!\n"); 1297 break; 1298 } 1299 1300 d = ic_first_dev; 1301 1302 timeout = timeout CONF_TIMEOUT_MULT; 1303 if (timeout > CONF_TIMEOUT_MAX) 1304 timeout = CONF_TIMEOUT_MAX; 1305 1306 pr_cont("."); 1307 } 1308 1309 #ifdef IPCONFIG_BOOTP 1310 if (do_bootp) 1311 ic_bootp_cleanup(); 1312 #endif 1313 #ifdef IPCONFIG_RARP 1314 if (do_rarp) 1315 ic_rarp_cleanup(); 1316 #endif 1317 1318 if (!ic_got_reply) { 1319 ic_myaddr = NONE; 1320 return -1; 1321 } 1322 1323 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n", 1324 ((ic_got_reply & IC_RARP) ? "RARP" 1325 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1326 &ic_addrservaddr, &ic_myaddr); 1327 1328 return 0; 1329 } 1330 1331 #endif /* IPCONFIG_DYNAMIC */ 1332 1333 #ifdef CONFIG_PROC_FS 1334 /* proc_dir_entry for /proc/net/ipconfig */ 1335 static struct proc_dir_entry *ipconfig_dir; 1336 1337 /* Name servers: */ 1338 static int pnp_seq_show(struct seq_file *seq, void *v) 1339 { 1340 int i; 1341 1342 if (ic_proto_used & IC_PROTO) 1343 seq_printf(seq, "#PROTO: %s\n", 1344 (ic_proto_used & IC_RARP) ? "RARP" 1345 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1346 else 1347 seq_puts(seq, "#MANUAL\n"); 1348 1349 if (ic_domain[0]) 1350 seq_printf(seq, 1351 "domain %s\n", ic_domain); 1352 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1353 if (ic_nameservers[i] != NONE) 1354 seq_printf(seq, "nameserver %pI4\n", 1355 &ic_nameservers[i]); 1356 } 1357 if (ic_servaddr != NONE) 1358 seq_printf(seq, "bootserver %pI4\n", 1359 &ic_servaddr); 1360 return 0; 1361 } 1362 1363 /* Create the /proc/net/ipconfig directory */ 1364 static int __init ipconfig_proc_net_init(void) 1365 { 1366 ipconfig_dir = proc_net_mkdir(&init_net, "ipconfig", init_net.proc_net); 1367 if (!ipconfig_dir) 1368 return -ENOMEM; 1369 1370 return 0; 1371 } 1372 1373 /* Create a new file under /proc/net/ipconfig */ 1374 static int ipconfig_proc_net_create(const char *name, 1375 const struct proc_ops *proc_ops) 1376 { 1377 char *pname; 1378 struct proc_dir_entry *p; 1379 1380 if (!ipconfig_dir) 1381 return -ENOMEM; 1382 1383 pname = kasprintf(GFP_KERNEL, "%s%s", "ipconfig/", name); 1384 if (!pname) 1385 return -ENOMEM; 1386 1387 p = proc_create(pname, 0444, init_net.proc_net, proc_ops); 1388 kfree(pname); 1389 if (!p) 1390 return -ENOMEM; 1391 1392 return 0; 1393 } 1394 1395 /* Write NTP server IP addresses to /proc/net/ipconfig/ntp_servers */ 1396 static int ntp_servers_show(struct seq_file *seq, void *v) 1397 { 1398 int i; 1399 1400 for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) { 1401 if (ic_ntp_servers[i] != NONE) 1402 seq_printf(seq, "%pI4\n", &ic_ntp_servers[i]); 1403 } 1404 return 0; 1405 } 1406 DEFINE_PROC_SHOW_ATTRIBUTE(ntp_servers); 1407 #endif /* CONFIG_PROC_FS */ 1408 1409 /* 1410 * Extract IP address from the parameter string if needed. Note that we 1411 * need to have root_server_addr set _before_ IPConfig gets called as it 1412 * can override it. 1413 */ 1414 __be32 __init root_nfs_parse_addr(char *name) 1415 { 1416 __be32 addr; 1417 int octets = 0; 1418 char *cp, *cq; 1419 1420 cp = cq = name; 1421 while (octets < 4) { 1422 while (*cp >= '0' && *cp <= '9') 1423 cp++; 1424 if (cp == cq || cp - cq > 3) 1425 break; 1426 if (*cp == '.' || octets == 3) 1427 octets++; 1428 if (octets < 4) 1429 cp++; 1430 cq = cp; 1431 } 1432 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1433 if (*cp == ':') 1434 *cp++ = '\0'; 1435 addr = in_aton(name); 1436 memmove(name, cp, strlen(cp) + 1); 1437 } else 1438 addr = NONE; 1439 1440 return addr; 1441 } 1442 1443 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1444 1445 static int __init wait_for_devices(void) 1446 { 1447 int i; 1448 bool try_init_devs = true; 1449 1450 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1451 struct net_device *dev; 1452 int found = 0; 1453 1454 /* make sure deferred device probes are finished */ 1455 wait_for_device_probe(); 1456 1457 rtnl_lock(); 1458 for_each_netdev(&init_net, dev) { 1459 if (ic_is_init_dev(dev)) { 1460 found = 1; 1461 break; 1462 } 1463 } 1464 rtnl_unlock(); 1465 if (found) 1466 return 0; 1467 if (try_init_devs && 1468 (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) { 1469 try_init_devs = false; 1470 wait_for_init_devices_probe(); 1471 } 1472 ssleep(1); 1473 } 1474 return -ENODEV; 1475 } 1476 1477 /* 1478 * IP Autoconfig dispatcher. 1479 */ 1480 1481 static int __init ip_auto_config(void) 1482 { 1483 __be32 addr; 1484 #ifdef IPCONFIG_DYNAMIC 1485 int retries = CONF_OPEN_RETRIES; 1486 #endif 1487 int err; 1488 unsigned int i, count; 1489 1490 /* Initialise all name servers and NTP servers to NONE (but only if the 1491 * "ip=" or "nfsaddrs=" kernel command line parameters weren't decoded, 1492 * otherwise we'll overwrite the IP addresses specified there) 1493 */ 1494 if (ic_set_manually == 0) { 1495 ic_nameservers_predef(); 1496 ic_ntp_servers_predef(); 1497 } 1498 1499 #ifdef CONFIG_PROC_FS 1500 proc_create_single("pnp", 0444, init_net.proc_net, pnp_seq_show); 1501 1502 if (ipconfig_proc_net_init() == 0) 1503 ipconfig_proc_net_create("ntp_servers", &ntp_servers_proc_ops); 1504 #endif /* CONFIG_PROC_FS */ 1505 1506 if (!ic_enable) 1507 return 0; 1508 1509 pr_debug("IP-Config: Entered.\n"); 1510 #ifdef IPCONFIG_DYNAMIC 1511 try_try_again: 1512 #endif 1513 /* Wait for devices to appear */ 1514 err = wait_for_devices(); 1515 if (err) 1516 return err; 1517 1518 /* Setup all network devices */ 1519 err = ic_open_devs(); 1520 if (err) 1521 return err; 1522 1523 /* Give drivers a chance to settle */ 1524 msleep(CONF_POST_OPEN); 1525 1526 /* 1527 * If the config information is insufficient (e.g., our IP address or 1528 * IP address of the boot server is missing or we have multiple network 1529 * interfaces and no default was set), use BOOTP or RARP to get the 1530 * missing values. 1531 */ 1532 if (ic_myaddr == NONE || 1533 #if defined(CONFIG_ROOT_NFS) || defined(CONFIG_CIFS_ROOT) 1534 (root_server_addr == NONE && 1535 ic_servaddr == NONE && 1536 (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) || 1537 #endif 1538 ic_first_dev->next) { 1539 #ifdef IPCONFIG_DYNAMIC 1540 if (ic_dynamic() < 0) { 1541 ic_close_devs(); 1542 1543 /* 1544 * I don't know why, but sometimes the 1545 * eepro100 driver (at least) gets upset and 1546 * doesn't work the first time it's opened. 1547 * But then if you close it and reopen it, it 1548 * works just fine. So we need to try that at 1549 * least once before giving up. 1550 * 1551 * Also, if the root will be NFS-mounted, we 1552 * have nowhere to go if DHCP fails. So we 1553 * just have to keep trying forever. 1554 * 1555 * -- Chip 1556 */ 1557 #ifdef CONFIG_ROOT_NFS 1558 if (ROOT_DEV == Root_NFS) { 1559 pr_err("IP-Config: Retrying forever (NFS root)...\n"); 1560 goto try_try_again; 1561 } 1562 #endif 1563 #ifdef CONFIG_CIFS_ROOT 1564 if (ROOT_DEV == Root_CIFS) { 1565 pr_err("IP-Config: Retrying forever (CIFS root)...\n"); 1566 goto try_try_again; 1567 } 1568 #endif 1569 1570 if (--retries) { 1571 pr_err("IP-Config: Reopening network devices...\n"); 1572 goto try_try_again; 1573 } 1574 1575 /* Oh, well. At least we tried. */ 1576 pr_err("IP-Config: Auto-configuration of network failed\n"); 1577 return -1; 1578 } 1579 #else /* !DYNAMIC */ 1580 pr_err("IP-Config: Incomplete network configuration information\n"); 1581 ic_close_devs(); 1582 return -1; 1583 #endif /* IPCONFIG_DYNAMIC */ 1584 } else { 1585 /* Device selected manually or only one device -> use it */ 1586 ic_dev = ic_first_dev; 1587 } 1588 1589 addr = root_nfs_parse_addr(root_server_path); 1590 if (root_server_addr == NONE) 1591 root_server_addr = addr; 1592 1593 /* 1594 * Use defaults wherever applicable. 1595 */ 1596 if (ic_defaults() < 0) 1597 return -1; 1598 1599 /* 1600 * Record which protocol was actually used. 1601 */ 1602 #ifdef IPCONFIG_DYNAMIC 1603 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1604 #endif 1605 1606 #ifndef IPCONFIG_SILENT 1607 /* 1608 * Clue in the operator. 1609 */ 1610 pr_info("IP-Config: Complete:\n"); 1611 1612 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", 1613 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr, 1614 &ic_myaddr, &ic_netmask, &ic_gateway); 1615 pr_info(" host=%s, domain=%s, nis-domain=%s\n", 1616 utsname()->nodename, ic_domain, utsname()->domainname); 1617 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", 1618 &ic_servaddr, &root_server_addr, root_server_path); 1619 if (ic_dev_mtu) 1620 pr_cont(", mtu=%d", ic_dev_mtu); 1621 /* Name servers (if any): */ 1622 for (i = 0, count = 0; i < CONF_NAMESERVERS_MAX; i++) { 1623 if (ic_nameservers[i] != NONE) { 1624 if (i == 0) 1625 pr_info(" nameserver%u=%pI4", 1626 i, &ic_nameservers[i]); 1627 else 1628 pr_cont(", nameserver%u=%pI4", 1629 i, &ic_nameservers[i]); 1630 1631 count++; 1632 } 1633 if ((i + 1 == CONF_NAMESERVERS_MAX) && count > 0) 1634 pr_cont("\n"); 1635 } 1636 /* NTP servers (if any): */ 1637 for (i = 0, count = 0; i < CONF_NTP_SERVERS_MAX; i++) { 1638 if (ic_ntp_servers[i] != NONE) { 1639 if (i == 0) 1640 pr_info(" ntpserver%u=%pI4", 1641 i, &ic_ntp_servers[i]); 1642 else 1643 pr_cont(", ntpserver%u=%pI4", 1644 i, &ic_ntp_servers[i]); 1645 1646 count++; 1647 } 1648 if ((i + 1 == CONF_NTP_SERVERS_MAX) && count > 0) 1649 pr_cont("\n"); 1650 } 1651 #endif /* !SILENT */ 1652 1653 /* 1654 * Close all network devices except the device we've 1655 * autoconfigured and set up routes. 1656 */ 1657 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1658 err = -1; 1659 else 1660 err = 0; 1661 1662 ic_close_devs(); 1663 1664 return err; 1665 } 1666 1667 late_initcall(ip_auto_config); 1668 1669 1670 /* 1671 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1672 * command line parameter. See Documentation/admin-guide/nfs/nfsroot.rst. 1673 */ 1674 static int __init ic_proto_name(char *name) 1675 { 1676 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1677 return 1; 1678 } 1679 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1680 return 0; 1681 } 1682 #ifdef CONFIG_IP_PNP_DHCP 1683 else if (!strncmp(name, "dhcp", 4)) { 1684 char *client_id; 1685 1686 ic_proto_enabled &= ~IC_RARP; 1687 client_id = strstr(name, "dhcp,"); 1688 if (client_id) { 1689 char *v; 1690 1691 client_id = client_id + 5; 1692 v = strchr(client_id, ','); 1693 if (!v) 1694 return 1; 1695 *v = 0; 1696 if (kstrtou8(client_id, 0, dhcp_client_identifier)) 1697 pr_debug("DHCP: Invalid client identifier type\n"); 1698 strscpy(dhcp_client_identifier + 1, v + 1, 1699 sizeof(dhcp_client_identifier) - 1); 1700 *v = ','; 1701 } 1702 return 1; 1703 } 1704 #endif 1705 #ifdef CONFIG_IP_PNP_BOOTP 1706 else if (!strcmp(name, "bootp")) { 1707 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1708 return 1; 1709 } 1710 #endif 1711 #ifdef CONFIG_IP_PNP_RARP 1712 else if (!strcmp(name, "rarp")) { 1713 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1714 return 1; 1715 } 1716 #endif 1717 #ifdef IPCONFIG_DYNAMIC 1718 else if (!strcmp(name, "both")) { 1719 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1720 return 1; 1721 } 1722 #endif 1723 return 0; 1724 } 1725 1726 static int __init ip_auto_config_setup(char *addrs) 1727 { 1728 char *cp, *ip, *dp; 1729 int num = 0; 1730 1731 ic_set_manually = 1; 1732 ic_enable = 1; 1733 1734 /* 1735 * If any dhcp, bootp etc options are set, leave autoconfig on 1736 * and skip the below static IP processing. 1737 */ 1738 if (ic_proto_name(addrs)) 1739 return 1; 1740 1741 /* If no static IP is given, turn off autoconfig and bail. */ 1742 if (*addrs == 0 || 1743 strcmp(addrs, "off") == 0 || 1744 strcmp(addrs, "none") == 0) { 1745 ic_enable = 0; 1746 return 1; 1747 } 1748 1749 /* Initialise all name servers and NTP servers to NONE */ 1750 ic_nameservers_predef(); 1751 ic_ntp_servers_predef(); 1752 1753 /* Parse string for static IP assignment. */ 1754 ip = addrs; 1755 while (ip && *ip) { 1756 if ((cp = strchr(ip, ':'))) 1757 *cp++ = '\0'; 1758 if (strlen(ip) > 0) { 1759 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip); 1760 switch (num) { 1761 case 0: 1762 if ((ic_myaddr = in_aton(ip)) == ANY) 1763 ic_myaddr = NONE; 1764 break; 1765 case 1: 1766 if ((ic_servaddr = in_aton(ip)) == ANY) 1767 ic_servaddr = NONE; 1768 break; 1769 case 2: 1770 if ((ic_gateway = in_aton(ip)) == ANY) 1771 ic_gateway = NONE; 1772 break; 1773 case 3: 1774 if ((ic_netmask = in_aton(ip)) == ANY) 1775 ic_netmask = NONE; 1776 break; 1777 case 4: 1778 if ((dp = strchr(ip, '.'))) { 1779 *dp++ = '\0'; 1780 strscpy(utsname()->domainname, dp, 1781 sizeof(utsname()->domainname)); 1782 } 1783 strscpy(utsname()->nodename, ip, 1784 sizeof(utsname()->nodename)); 1785 ic_host_name_set = 1; 1786 break; 1787 case 5: 1788 strscpy(user_dev_name, ip, sizeof(user_dev_name)); 1789 break; 1790 case 6: 1791 if (ic_proto_name(ip) == 0 && 1792 ic_myaddr == NONE) { 1793 ic_enable = 0; 1794 } 1795 break; 1796 case 7: 1797 if (CONF_NAMESERVERS_MAX >= 1) { 1798 ic_nameservers[0] = in_aton(ip); 1799 if (ic_nameservers[0] == ANY) 1800 ic_nameservers[0] = NONE; 1801 } 1802 break; 1803 case 8: 1804 if (CONF_NAMESERVERS_MAX >= 2) { 1805 ic_nameservers[1] = in_aton(ip); 1806 if (ic_nameservers[1] == ANY) 1807 ic_nameservers[1] = NONE; 1808 } 1809 break; 1810 case 9: 1811 if (CONF_NTP_SERVERS_MAX >= 1) { 1812 ic_ntp_servers[0] = in_aton(ip); 1813 if (ic_ntp_servers[0] == ANY) 1814 ic_ntp_servers[0] = NONE; 1815 } 1816 break; 1817 } 1818 } 1819 ip = cp; 1820 num++; 1821 } 1822 1823 return 1; 1824 } 1825 __setup("ip=", ip_auto_config_setup); 1826 1827 static int __init nfsaddrs_config_setup(char *addrs) 1828 { 1829 return ip_auto_config_setup(addrs); 1830 } 1831 __setup("nfsaddrs=", nfsaddrs_config_setup); 1832 1833 static int __init vendor_class_identifier_setup(char *addrs) 1834 { 1835 if (strscpy(vendor_class_identifier, addrs, 1836 sizeof(vendor_class_identifier)) 1837 >= sizeof(vendor_class_identifier)) 1838 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n", 1839 vendor_class_identifier); 1840 return 1; 1841 } 1842 __setup("dhcpclass=", vendor_class_identifier_setup); 1843 1844 static int __init set_carrier_timeout(char *str) 1845 { 1846 ssize_t ret; 1847 1848 if (!str) 1849 return 0; 1850 1851 ret = kstrtouint(str, 0, &carrier_timeout); 1852 if (ret) 1853 return 0; 1854 1855 return 1; 1856 } 1857 __setup("carrier_timeout=", set_carrier_timeout); 1858