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 33 #include <linux/types.h> 34 #include <linux/string.h> 35 #include <linux/kernel.h> 36 #include <linux/jiffies.h> 37 #include <linux/random.h> 38 #include <linux/init.h> 39 #include <linux/utsname.h> 40 #include <linux/in.h> 41 #include <linux/if.h> 42 #include <linux/inet.h> 43 #include <linux/inetdevice.h> 44 #include <linux/netdevice.h> 45 #include <linux/if_arp.h> 46 #include <linux/skbuff.h> 47 #include <linux/ip.h> 48 #include <linux/socket.h> 49 #include <linux/route.h> 50 #include <linux/udp.h> 51 #include <linux/proc_fs.h> 52 #include <linux/seq_file.h> 53 #include <linux/major.h> 54 #include <linux/root_dev.h> 55 #include <linux/delay.h> 56 #include <linux/nfs_fs.h> 57 #include <linux/slab.h> 58 #include <linux/export.h> 59 #include <net/net_namespace.h> 60 #include <net/arp.h> 61 #include <net/dsa.h> 62 #include <net/ip.h> 63 #include <net/ipconfig.h> 64 #include <net/route.h> 65 66 #include <linux/uaccess.h> 67 #include <net/checksum.h> 68 #include <asm/processor.h> 69 70 #if defined(CONFIG_IP_PNP_DHCP) 71 #define IPCONFIG_DHCP 72 #endif 73 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) 74 #define IPCONFIG_BOOTP 75 #endif 76 #if defined(CONFIG_IP_PNP_RARP) 77 #define IPCONFIG_RARP 78 #endif 79 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) 80 #define IPCONFIG_DYNAMIC 81 #endif 82 83 /* Define the friendly delay before and after opening net devices */ 84 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */ 85 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */ 86 87 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ 88 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ 89 #define CONF_SEND_RETRIES 6 /* Send six requests per open */ 90 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ 91 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ 92 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ 93 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ 94 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers 95 - '3' from resolv.h */ 96 97 #define NONE cpu_to_be32(INADDR_NONE) 98 #define ANY cpu_to_be32(INADDR_ANY) 99 100 /* 101 * Public IP configuration 102 */ 103 104 /* This is used by platforms which might be able to set the ipconfig 105 * variables using firmware environment vars. If this is set, it will 106 * ignore such firmware variables. 107 */ 108 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ 109 110 static int ic_enable __initdata; /* IP config enabled? */ 111 112 /* Protocol choice */ 113 int ic_proto_enabled __initdata = 0 114 #ifdef IPCONFIG_BOOTP 115 | IC_BOOTP 116 #endif 117 #ifdef CONFIG_IP_PNP_DHCP 118 | IC_USE_DHCP 119 #endif 120 #ifdef IPCONFIG_RARP 121 | IC_RARP 122 #endif 123 ; 124 125 static int ic_host_name_set __initdata; /* Host name set by us? */ 126 127 __be32 ic_myaddr = NONE; /* My IP address */ 128 static __be32 ic_netmask = NONE; /* Netmask for local subnet */ 129 __be32 ic_gateway = NONE; /* Gateway IP address */ 130 131 #ifdef IPCONFIG_DYNAMIC 132 static __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */ 133 #endif 134 135 __be32 ic_servaddr = NONE; /* Boot server IP address */ 136 137 __be32 root_server_addr = NONE; /* Address of NFS server */ 138 u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 139 140 /* vendor class identifier */ 141 static char vendor_class_identifier[253] __initdata; 142 143 #if defined(CONFIG_IP_PNP_DHCP) 144 static char dhcp_client_identifier[253] __initdata; 145 #endif 146 147 /* Persistent data: */ 148 149 #ifdef IPCONFIG_DYNAMIC 150 static int ic_proto_used; /* Protocol used, if any */ 151 #else 152 #define ic_proto_used 0 153 #endif 154 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 155 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 156 157 /* 158 * Private state. 159 */ 160 161 /* Name of user-selected boot device */ 162 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 163 164 /* Protocols supported by available interfaces */ 165 static int ic_proto_have_if __initdata; 166 167 /* MTU for boot device */ 168 static int ic_dev_mtu __initdata; 169 170 #ifdef IPCONFIG_DYNAMIC 171 static DEFINE_SPINLOCK(ic_recv_lock); 172 static volatile int ic_got_reply __initdata; /* Proto(s) that replied */ 173 #endif 174 #ifdef IPCONFIG_DHCP 175 static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */ 176 #endif 177 178 179 /* 180 * Network devices 181 */ 182 183 struct ic_device { 184 struct ic_device *next; 185 struct net_device *dev; 186 unsigned short flags; 187 short able; 188 __be32 xid; 189 }; 190 191 static struct ic_device *ic_first_dev __initdata; /* List of open device */ 192 static struct ic_device *ic_dev __initdata; /* Selected device */ 193 194 static bool __init ic_is_init_dev(struct net_device *dev) 195 { 196 if (dev->flags & IFF_LOOPBACK) 197 return false; 198 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 199 (!(dev->flags & IFF_LOOPBACK) && 200 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 201 strncmp(dev->name, "dummy", 5)); 202 } 203 204 static int __init ic_open_devs(void) 205 { 206 struct ic_device *d, **last; 207 struct net_device *dev; 208 unsigned short oflags; 209 unsigned long start, next_msg; 210 211 last = &ic_first_dev; 212 rtnl_lock(); 213 214 /* bring loopback and DSA master network devices up first */ 215 for_each_netdev(&init_net, dev) { 216 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev)) 217 continue; 218 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) 219 pr_err("IP-Config: Failed to open %s\n", dev->name); 220 } 221 222 for_each_netdev(&init_net, dev) { 223 if (ic_is_init_dev(dev)) { 224 int able = 0; 225 if (dev->mtu >= 364) 226 able |= IC_BOOTP; 227 else 228 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n", 229 dev->name, dev->mtu); 230 if (!(dev->flags & IFF_NOARP)) 231 able |= IC_RARP; 232 able &= ic_proto_enabled; 233 if (ic_proto_enabled && !able) 234 continue; 235 oflags = dev->flags; 236 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 237 pr_err("IP-Config: Failed to open %s\n", 238 dev->name); 239 continue; 240 } 241 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 242 rtnl_unlock(); 243 return -ENOMEM; 244 } 245 d->dev = dev; 246 *last = d; 247 last = &d->next; 248 d->flags = oflags; 249 d->able = able; 250 if (able & IC_BOOTP) 251 get_random_bytes(&d->xid, sizeof(__be32)); 252 else 253 d->xid = 0; 254 ic_proto_have_if |= able; 255 pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n", 256 dev->name, able, d->xid); 257 } 258 } 259 260 /* no point in waiting if we could not bring up at least one device */ 261 if (!ic_first_dev) 262 goto have_carrier; 263 264 /* wait for a carrier on at least one device */ 265 start = jiffies; 266 next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12); 267 while (time_before(jiffies, start + 268 msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) { 269 int wait, elapsed; 270 271 for_each_netdev(&init_net, dev) 272 if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) 273 goto have_carrier; 274 275 msleep(1); 276 277 if (time_before(jiffies, next_msg)) 278 continue; 279 280 elapsed = jiffies_to_msecs(jiffies - start); 281 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000; 282 pr_info("Waiting up to %d more seconds for network.\n", wait); 283 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12); 284 } 285 have_carrier: 286 rtnl_unlock(); 287 288 *last = NULL; 289 290 if (!ic_first_dev) { 291 if (user_dev_name[0]) 292 pr_err("IP-Config: Device `%s' not found\n", 293 user_dev_name); 294 else 295 pr_err("IP-Config: No network devices available\n"); 296 return -ENODEV; 297 } 298 return 0; 299 } 300 301 static void __init ic_close_devs(void) 302 { 303 struct ic_device *d, *next; 304 struct net_device *dev; 305 306 rtnl_lock(); 307 next = ic_first_dev; 308 while ((d = next)) { 309 next = d->next; 310 dev = d->dev; 311 if (d != ic_dev && !netdev_uses_dsa(dev)) { 312 pr_debug("IP-Config: Downing %s\n", dev->name); 313 dev_change_flags(dev, d->flags); 314 } 315 kfree(d); 316 } 317 rtnl_unlock(); 318 } 319 320 /* 321 * Interface to various network functions. 322 */ 323 324 static inline void 325 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 326 { 327 sin->sin_family = AF_INET; 328 sin->sin_addr.s_addr = addr; 329 sin->sin_port = port; 330 } 331 332 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg) 333 { 334 int res; 335 336 mm_segment_t oldfs = get_fs(); 337 set_fs(get_ds()); 338 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 339 set_fs(oldfs); 340 return res; 341 } 342 343 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 344 { 345 int res; 346 347 mm_segment_t oldfs = get_fs(); 348 set_fs(get_ds()); 349 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 350 set_fs(oldfs); 351 return res; 352 } 353 354 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 355 { 356 int res; 357 358 mm_segment_t oldfs = get_fs(); 359 set_fs(get_ds()); 360 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); 361 set_fs(oldfs); 362 return res; 363 } 364 365 /* 366 * Set up interface addresses and routes. 367 */ 368 369 static int __init ic_setup_if(void) 370 { 371 struct ifreq ir; 372 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 373 int err; 374 375 memset(&ir, 0, sizeof(ir)); 376 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name); 377 set_sockaddr(sin, ic_myaddr, 0); 378 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) { 379 pr_err("IP-Config: Unable to set interface address (%d)\n", 380 err); 381 return -1; 382 } 383 set_sockaddr(sin, ic_netmask, 0); 384 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 385 pr_err("IP-Config: Unable to set interface netmask (%d)\n", 386 err); 387 return -1; 388 } 389 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 390 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 391 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n", 392 err); 393 return -1; 394 } 395 /* Handle the case where we need non-standard MTU on the boot link (a network 396 * using jumbo frames, for instance). If we can't set the mtu, don't error 397 * out, we'll try to muddle along. 398 */ 399 if (ic_dev_mtu != 0) { 400 strcpy(ir.ifr_name, ic_dev->dev->name); 401 ir.ifr_mtu = ic_dev_mtu; 402 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0) 403 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", 404 ic_dev_mtu, err); 405 } 406 return 0; 407 } 408 409 static int __init ic_setup_routes(void) 410 { 411 /* No need to setup device routes, only the default route... */ 412 413 if (ic_gateway != NONE) { 414 struct rtentry rm; 415 int err; 416 417 memset(&rm, 0, sizeof(rm)); 418 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 419 pr_err("IP-Config: Gateway not on directly connected network\n"); 420 return -1; 421 } 422 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 423 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 424 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 425 rm.rt_flags = RTF_UP | RTF_GATEWAY; 426 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 427 pr_err("IP-Config: Cannot add default route (%d)\n", 428 err); 429 return -1; 430 } 431 } 432 433 return 0; 434 } 435 436 /* 437 * Fill in default values for all missing parameters. 438 */ 439 440 static int __init ic_defaults(void) 441 { 442 /* 443 * At this point we have no userspace running so need not 444 * claim locks on system_utsname 445 */ 446 447 if (!ic_host_name_set) 448 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 449 450 if (root_server_addr == NONE) 451 root_server_addr = ic_servaddr; 452 453 if (ic_netmask == NONE) { 454 if (IN_CLASSA(ntohl(ic_myaddr))) 455 ic_netmask = htonl(IN_CLASSA_NET); 456 else if (IN_CLASSB(ntohl(ic_myaddr))) 457 ic_netmask = htonl(IN_CLASSB_NET); 458 else if (IN_CLASSC(ntohl(ic_myaddr))) 459 ic_netmask = htonl(IN_CLASSC_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 /* 613 * DHCP/BOOTP support. 614 */ 615 616 #ifdef IPCONFIG_BOOTP 617 618 struct bootp_pkt { /* BOOTP packet format */ 619 struct iphdr iph; /* IP header */ 620 struct udphdr udph; /* UDP header */ 621 u8 op; /* 1=request, 2=reply */ 622 u8 htype; /* HW address type */ 623 u8 hlen; /* HW address length */ 624 u8 hops; /* Used only by gateways */ 625 __be32 xid; /* Transaction ID */ 626 __be16 secs; /* Seconds since we started */ 627 __be16 flags; /* Just what it says */ 628 __be32 client_ip; /* Client's IP address if known */ 629 __be32 your_ip; /* Assigned IP address */ 630 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 631 __be32 relay_ip; /* IP address of BOOTP relay */ 632 u8 hw_addr[16]; /* Client's HW address */ 633 u8 serv_name[64]; /* Server host name */ 634 u8 boot_file[128]; /* Name of boot file */ 635 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 636 }; 637 638 /* packet ops */ 639 #define BOOTP_REQUEST 1 640 #define BOOTP_REPLY 2 641 642 /* DHCP message types */ 643 #define DHCPDISCOVER 1 644 #define DHCPOFFER 2 645 #define DHCPREQUEST 3 646 #define DHCPDECLINE 4 647 #define DHCPACK 5 648 #define DHCPNAK 6 649 #define DHCPRELEASE 7 650 #define DHCPINFORM 8 651 652 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 653 654 static struct packet_type bootp_packet_type __initdata = { 655 .type = cpu_to_be16(ETH_P_IP), 656 .func = ic_bootp_recv, 657 }; 658 659 /* 660 * Initialize DHCP/BOOTP extension fields in the request. 661 */ 662 663 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 664 665 #ifdef IPCONFIG_DHCP 666 667 static void __init 668 ic_dhcp_init_options(u8 *options, struct ic_device *d) 669 { 670 u8 mt = ((ic_servaddr == NONE) 671 ? DHCPDISCOVER : DHCPREQUEST); 672 u8 *e = options; 673 int len; 674 675 pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name); 676 677 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 678 e += 4; 679 680 *e++ = 53; /* DHCP message type */ 681 *e++ = 1; 682 *e++ = mt; 683 684 if (mt == DHCPREQUEST) { 685 *e++ = 54; /* Server ID (IP address) */ 686 *e++ = 4; 687 memcpy(e, &ic_servaddr, 4); 688 e += 4; 689 690 *e++ = 50; /* Requested IP address */ 691 *e++ = 4; 692 memcpy(e, &ic_myaddr, 4); 693 e += 4; 694 } 695 696 /* always? */ 697 { 698 static const u8 ic_req_params[] = { 699 1, /* Subnet mask */ 700 3, /* Default gateway */ 701 6, /* DNS server */ 702 12, /* Host name */ 703 15, /* Domain name */ 704 17, /* Boot path */ 705 26, /* MTU */ 706 40, /* NIS domain name */ 707 }; 708 709 *e++ = 55; /* Parameter request list */ 710 *e++ = sizeof(ic_req_params); 711 memcpy(e, ic_req_params, sizeof(ic_req_params)); 712 e += sizeof(ic_req_params); 713 714 if (ic_host_name_set) { 715 *e++ = 12; /* host-name */ 716 len = strlen(utsname()->nodename); 717 *e++ = len; 718 memcpy(e, utsname()->nodename, len); 719 e += len; 720 } 721 if (*vendor_class_identifier) { 722 pr_info("DHCP: sending class identifier \"%s\"\n", 723 vendor_class_identifier); 724 *e++ = 60; /* Class-identifier */ 725 len = strlen(vendor_class_identifier); 726 *e++ = len; 727 memcpy(e, vendor_class_identifier, len); 728 e += len; 729 } 730 len = strlen(dhcp_client_identifier + 1); 731 /* the minimum length of identifier is 2, include 1 byte type, 732 * and can not be larger than the length of options 733 */ 734 if (len >= 1 && len < 312 - (e - options) - 1) { 735 *e++ = 61; 736 *e++ = len + 1; 737 memcpy(e, dhcp_client_identifier, len + 1); 738 e += len + 1; 739 } 740 } 741 742 *e++ = 255; /* End of the list */ 743 } 744 745 #endif /* IPCONFIG_DHCP */ 746 747 static void __init ic_bootp_init_ext(u8 *e) 748 { 749 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 750 e += 4; 751 *e++ = 1; /* Subnet mask request */ 752 *e++ = 4; 753 e += 4; 754 *e++ = 3; /* Default gateway request */ 755 *e++ = 4; 756 e += 4; 757 *e++ = 5; /* Name server request */ 758 *e++ = 8; 759 e += 8; 760 *e++ = 12; /* Host name request */ 761 *e++ = 32; 762 e += 32; 763 *e++ = 40; /* NIS Domain name request */ 764 *e++ = 32; 765 e += 32; 766 *e++ = 17; /* Boot path */ 767 *e++ = 40; 768 e += 40; 769 770 *e++ = 57; /* set extension buffer size for reply */ 771 *e++ = 2; 772 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 773 *e++ = 150; 774 775 *e++ = 255; /* End of the list */ 776 } 777 778 779 /* 780 * Initialize the DHCP/BOOTP mechanism. 781 */ 782 static inline void __init ic_bootp_init(void) 783 { 784 ic_nameservers_predef(); 785 786 dev_add_pack(&bootp_packet_type); 787 } 788 789 790 /* 791 * DHCP/BOOTP cleanup. 792 */ 793 static inline void __init ic_bootp_cleanup(void) 794 { 795 dev_remove_pack(&bootp_packet_type); 796 } 797 798 799 /* 800 * Send DHCP/BOOTP request to single interface. 801 */ 802 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 803 { 804 struct net_device *dev = d->dev; 805 struct sk_buff *skb; 806 struct bootp_pkt *b; 807 struct iphdr *h; 808 int hlen = LL_RESERVED_SPACE(dev); 809 int tlen = dev->needed_tailroom; 810 811 /* Allocate packet */ 812 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, 813 GFP_KERNEL); 814 if (!skb) 815 return; 816 skb_reserve(skb, hlen); 817 b = skb_put_zero(skb, sizeof(struct bootp_pkt)); 818 819 /* Construct IP header */ 820 skb_reset_network_header(skb); 821 h = ip_hdr(skb); 822 h->version = 4; 823 h->ihl = 5; 824 h->tot_len = htons(sizeof(struct bootp_pkt)); 825 h->frag_off = htons(IP_DF); 826 h->ttl = 64; 827 h->protocol = IPPROTO_UDP; 828 h->daddr = htonl(INADDR_BROADCAST); 829 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 830 831 /* Construct UDP header */ 832 b->udph.source = htons(68); 833 b->udph.dest = htons(67); 834 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 835 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 836 837 /* Construct DHCP/BOOTP header */ 838 b->op = BOOTP_REQUEST; 839 if (dev->type < 256) /* check for false types */ 840 b->htype = dev->type; 841 else if (dev->type == ARPHRD_FDDI) 842 b->htype = ARPHRD_ETHER; 843 else { 844 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type, 845 dev->name); 846 b->htype = dev->type; /* can cause undefined behavior */ 847 } 848 849 /* server_ip and your_ip address are both already zero per RFC2131 */ 850 b->hlen = dev->addr_len; 851 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 852 b->secs = htons(jiffies_diff / HZ); 853 b->xid = d->xid; 854 855 /* add DHCP options or BOOTP extensions */ 856 #ifdef IPCONFIG_DHCP 857 if (ic_proto_enabled & IC_USE_DHCP) 858 ic_dhcp_init_options(b->exten, d); 859 else 860 #endif 861 ic_bootp_init_ext(b->exten); 862 863 /* Chain packet down the line... */ 864 skb->dev = dev; 865 skb->protocol = htons(ETH_P_IP); 866 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 867 dev->broadcast, dev->dev_addr, skb->len) < 0) { 868 kfree_skb(skb); 869 printk("E"); 870 return; 871 } 872 873 if (dev_queue_xmit(skb) < 0) 874 printk("E"); 875 } 876 877 878 /* 879 * Copy BOOTP-supplied string if not already set. 880 */ 881 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 882 { 883 if (!len) 884 return 0; 885 if (len > max-1) 886 len = max-1; 887 memcpy(dest, src, len); 888 dest[len] = '\0'; 889 return 1; 890 } 891 892 893 /* 894 * Process BOOTP extensions. 895 */ 896 static void __init ic_do_bootp_ext(u8 *ext) 897 { 898 u8 servers; 899 int i; 900 __be16 mtu; 901 902 u8 *c; 903 904 pr_debug("DHCP/BOOTP: Got extension %d:", *ext); 905 for (c=ext+2; c<ext+2+ext[1]; c++) 906 pr_debug(" %02x", *c); 907 pr_debug("\n"); 908 909 switch (*ext++) { 910 case 1: /* Subnet mask */ 911 if (ic_netmask == NONE) 912 memcpy(&ic_netmask, ext+1, 4); 913 break; 914 case 3: /* Default gateway */ 915 if (ic_gateway == NONE) 916 memcpy(&ic_gateway, ext+1, 4); 917 break; 918 case 6: /* DNS server */ 919 servers= *ext/4; 920 if (servers > CONF_NAMESERVERS_MAX) 921 servers = CONF_NAMESERVERS_MAX; 922 for (i = 0; i < servers; i++) { 923 if (ic_nameservers[i] == NONE) 924 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 925 } 926 break; 927 case 12: /* Host name */ 928 ic_bootp_string(utsname()->nodename, ext+1, *ext, 929 __NEW_UTS_LEN); 930 ic_host_name_set = 1; 931 break; 932 case 15: /* Domain name (DNS) */ 933 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 934 break; 935 case 17: /* Root path */ 936 if (!root_server_path[0]) 937 ic_bootp_string(root_server_path, ext+1, *ext, 938 sizeof(root_server_path)); 939 break; 940 case 26: /* Interface MTU */ 941 memcpy(&mtu, ext+1, sizeof(mtu)); 942 ic_dev_mtu = ntohs(mtu); 943 break; 944 case 40: /* NIS Domain name (_not_ DNS) */ 945 ic_bootp_string(utsname()->domainname, ext+1, *ext, 946 __NEW_UTS_LEN); 947 break; 948 } 949 } 950 951 952 /* 953 * Receive BOOTP reply. 954 */ 955 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 956 { 957 struct bootp_pkt *b; 958 struct iphdr *h; 959 struct ic_device *d; 960 int len, ext_len; 961 962 if (!net_eq(dev_net(dev), &init_net)) 963 goto drop; 964 965 /* Perform verifications before taking the lock. */ 966 if (skb->pkt_type == PACKET_OTHERHOST) 967 goto drop; 968 969 skb = skb_share_check(skb, GFP_ATOMIC); 970 if (!skb) 971 return NET_RX_DROP; 972 973 if (!pskb_may_pull(skb, 974 sizeof(struct iphdr) + 975 sizeof(struct udphdr))) 976 goto drop; 977 978 b = (struct bootp_pkt *)skb_network_header(skb); 979 h = &b->iph; 980 981 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 982 goto drop; 983 984 /* Fragments are not supported */ 985 if (ip_is_fragment(h)) { 986 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); 987 goto drop; 988 } 989 990 if (skb->len < ntohs(h->tot_len)) 991 goto drop; 992 993 if (ip_fast_csum((char *) h, h->ihl)) 994 goto drop; 995 996 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 997 goto drop; 998 999 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 1000 goto drop; 1001 1002 len = ntohs(b->udph.len) - sizeof(struct udphdr); 1003 ext_len = len - (sizeof(*b) - 1004 sizeof(struct iphdr) - 1005 sizeof(struct udphdr) - 1006 sizeof(b->exten)); 1007 if (ext_len < 0) 1008 goto drop; 1009 1010 /* Ok the front looks good, make sure we can get at the rest. */ 1011 if (!pskb_may_pull(skb, skb->len)) 1012 goto drop; 1013 1014 b = (struct bootp_pkt *)skb_network_header(skb); 1015 h = &b->iph; 1016 1017 /* One reply at a time, please. */ 1018 spin_lock(&ic_recv_lock); 1019 1020 /* If we already have a reply, just drop the packet */ 1021 if (ic_got_reply) 1022 goto drop_unlock; 1023 1024 /* Find the ic_device that the packet arrived on */ 1025 d = ic_first_dev; 1026 while (d && d->dev != dev) 1027 d = d->next; 1028 if (!d) 1029 goto drop_unlock; /* should never happen */ 1030 1031 /* Is it a reply to our BOOTP request? */ 1032 if (b->op != BOOTP_REPLY || 1033 b->xid != d->xid) { 1034 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n", 1035 d->dev->name, b->op, b->xid); 1036 goto drop_unlock; 1037 } 1038 1039 /* Parse extensions */ 1040 if (ext_len >= 4 && 1041 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1042 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1043 u8 *ext; 1044 1045 #ifdef IPCONFIG_DHCP 1046 if (ic_proto_enabled & IC_USE_DHCP) { 1047 __be32 server_id = NONE; 1048 int mt = 0; 1049 1050 ext = &b->exten[4]; 1051 while (ext < end && *ext != 0xff) { 1052 u8 *opt = ext++; 1053 if (*opt == 0) /* Padding */ 1054 continue; 1055 ext += *ext + 1; 1056 if (ext >= end) 1057 break; 1058 switch (*opt) { 1059 case 53: /* Message type */ 1060 if (opt[1]) 1061 mt = opt[2]; 1062 break; 1063 case 54: /* Server ID (IP address) */ 1064 if (opt[1] >= 4) 1065 memcpy(&server_id, opt + 2, 4); 1066 break; 1067 } 1068 } 1069 1070 pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name); 1071 1072 switch (mt) { 1073 case DHCPOFFER: 1074 /* While in the process of accepting one offer, 1075 * ignore all others. 1076 */ 1077 if (ic_myaddr != NONE) 1078 goto drop_unlock; 1079 1080 /* Let's accept that offer. */ 1081 ic_myaddr = b->your_ip; 1082 ic_servaddr = server_id; 1083 pr_debug("DHCP: Offered address %pI4 by server %pI4\n", 1084 &ic_myaddr, &b->iph.saddr); 1085 /* The DHCP indicated server address takes 1086 * precedence over the bootp header one if 1087 * they are different. 1088 */ 1089 if ((server_id != NONE) && 1090 (b->server_ip != server_id)) 1091 b->server_ip = ic_servaddr; 1092 break; 1093 1094 case DHCPACK: 1095 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1096 goto drop_unlock; 1097 1098 /* Yeah! */ 1099 break; 1100 1101 default: 1102 /* Urque. Forget it*/ 1103 ic_myaddr = NONE; 1104 ic_servaddr = NONE; 1105 goto drop_unlock; 1106 } 1107 1108 ic_dhcp_msgtype = mt; 1109 1110 } 1111 #endif /* IPCONFIG_DHCP */ 1112 1113 ext = &b->exten[4]; 1114 while (ext < end && *ext != 0xff) { 1115 u8 *opt = ext++; 1116 if (*opt == 0) /* Padding */ 1117 continue; 1118 ext += *ext + 1; 1119 if (ext < end) 1120 ic_do_bootp_ext(opt); 1121 } 1122 } 1123 1124 /* We have a winner! */ 1125 ic_dev = d; 1126 ic_myaddr = b->your_ip; 1127 ic_servaddr = b->server_ip; 1128 ic_addrservaddr = b->iph.saddr; 1129 if (ic_gateway == NONE && b->relay_ip) 1130 ic_gateway = b->relay_ip; 1131 if (ic_nameservers[0] == NONE) 1132 ic_nameservers[0] = ic_servaddr; 1133 ic_got_reply = IC_BOOTP; 1134 1135 drop_unlock: 1136 /* Show's over. Nothing to see here. */ 1137 spin_unlock(&ic_recv_lock); 1138 1139 drop: 1140 /* Throw the packet out. */ 1141 kfree_skb(skb); 1142 1143 return 0; 1144 } 1145 1146 1147 #endif 1148 1149 1150 /* 1151 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1152 */ 1153 1154 #ifdef IPCONFIG_DYNAMIC 1155 1156 static int __init ic_dynamic(void) 1157 { 1158 int retries; 1159 struct ic_device *d; 1160 unsigned long start_jiffies, timeout, jiff; 1161 int do_bootp = ic_proto_have_if & IC_BOOTP; 1162 int do_rarp = ic_proto_have_if & IC_RARP; 1163 1164 /* 1165 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1166 * This routine gets only called when some pieces of information 1167 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1168 */ 1169 if (!ic_proto_enabled) { 1170 pr_err("IP-Config: Incomplete network configuration information\n"); 1171 return -1; 1172 } 1173 1174 #ifdef IPCONFIG_BOOTP 1175 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1176 pr_err("DHCP/BOOTP: No suitable device found\n"); 1177 #endif 1178 #ifdef IPCONFIG_RARP 1179 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1180 pr_err("RARP: No suitable device found\n"); 1181 #endif 1182 1183 if (!ic_proto_have_if) 1184 /* Error message already printed */ 1185 return -1; 1186 1187 /* 1188 * Setup protocols 1189 */ 1190 #ifdef IPCONFIG_BOOTP 1191 if (do_bootp) 1192 ic_bootp_init(); 1193 #endif 1194 #ifdef IPCONFIG_RARP 1195 if (do_rarp) 1196 ic_rarp_init(); 1197 #endif 1198 1199 /* 1200 * Send requests and wait, until we get an answer. This loop 1201 * seems to be a terrible waste of CPU time, but actually there is 1202 * only one process running at all, so we don't need to use any 1203 * scheduler functions. 1204 * [Actually we could now, but the nothing else running note still 1205 * applies.. - AC] 1206 */ 1207 pr_notice("Sending %s%s%s requests .", 1208 do_bootp 1209 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1210 (do_bootp && do_rarp) ? " and " : "", 1211 do_rarp ? "RARP" : ""); 1212 1213 start_jiffies = jiffies; 1214 d = ic_first_dev; 1215 retries = CONF_SEND_RETRIES; 1216 get_random_bytes(&timeout, sizeof(timeout)); 1217 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); 1218 for (;;) { 1219 #ifdef IPCONFIG_BOOTP 1220 if (do_bootp && (d->able & IC_BOOTP)) 1221 ic_bootp_send_if(d, jiffies - start_jiffies); 1222 #endif 1223 #ifdef IPCONFIG_RARP 1224 if (do_rarp && (d->able & IC_RARP)) 1225 ic_rarp_send_if(d); 1226 #endif 1227 1228 if (!d->next) { 1229 jiff = jiffies + timeout; 1230 while (time_before(jiffies, jiff) && !ic_got_reply) 1231 schedule_timeout_uninterruptible(1); 1232 } 1233 #ifdef IPCONFIG_DHCP 1234 /* DHCP isn't done until we get a DHCPACK. */ 1235 if ((ic_got_reply & IC_BOOTP) && 1236 (ic_proto_enabled & IC_USE_DHCP) && 1237 ic_dhcp_msgtype != DHCPACK) { 1238 ic_got_reply = 0; 1239 /* continue on device that got the reply */ 1240 d = ic_dev; 1241 pr_cont(","); 1242 continue; 1243 } 1244 #endif /* IPCONFIG_DHCP */ 1245 1246 if (ic_got_reply) { 1247 pr_cont(" OK\n"); 1248 break; 1249 } 1250 1251 if ((d = d->next)) 1252 continue; 1253 1254 if (! --retries) { 1255 pr_cont(" timed out!\n"); 1256 break; 1257 } 1258 1259 d = ic_first_dev; 1260 1261 timeout = timeout CONF_TIMEOUT_MULT; 1262 if (timeout > CONF_TIMEOUT_MAX) 1263 timeout = CONF_TIMEOUT_MAX; 1264 1265 pr_cont("."); 1266 } 1267 1268 #ifdef IPCONFIG_BOOTP 1269 if (do_bootp) 1270 ic_bootp_cleanup(); 1271 #endif 1272 #ifdef IPCONFIG_RARP 1273 if (do_rarp) 1274 ic_rarp_cleanup(); 1275 #endif 1276 1277 if (!ic_got_reply) { 1278 ic_myaddr = NONE; 1279 return -1; 1280 } 1281 1282 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n", 1283 ((ic_got_reply & IC_RARP) ? "RARP" 1284 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1285 &ic_addrservaddr, &ic_myaddr); 1286 1287 return 0; 1288 } 1289 1290 #endif /* IPCONFIG_DYNAMIC */ 1291 1292 #ifdef CONFIG_PROC_FS 1293 1294 static int pnp_seq_show(struct seq_file *seq, void *v) 1295 { 1296 int i; 1297 1298 if (ic_proto_used & IC_PROTO) 1299 seq_printf(seq, "#PROTO: %s\n", 1300 (ic_proto_used & IC_RARP) ? "RARP" 1301 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1302 else 1303 seq_puts(seq, "#MANUAL\n"); 1304 1305 if (ic_domain[0]) 1306 seq_printf(seq, 1307 "domain %s\n", ic_domain); 1308 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1309 if (ic_nameservers[i] != NONE) 1310 seq_printf(seq, "nameserver %pI4\n", 1311 &ic_nameservers[i]); 1312 } 1313 if (ic_servaddr != NONE) 1314 seq_printf(seq, "bootserver %pI4\n", 1315 &ic_servaddr); 1316 return 0; 1317 } 1318 1319 static int pnp_seq_open(struct inode *indoe, struct file *file) 1320 { 1321 return single_open(file, pnp_seq_show, NULL); 1322 } 1323 1324 static const struct file_operations pnp_seq_fops = { 1325 .owner = THIS_MODULE, 1326 .open = pnp_seq_open, 1327 .read = seq_read, 1328 .llseek = seq_lseek, 1329 .release = single_release, 1330 }; 1331 #endif /* CONFIG_PROC_FS */ 1332 1333 /* 1334 * Extract IP address from the parameter string if needed. Note that we 1335 * need to have root_server_addr set _before_ IPConfig gets called as it 1336 * can override it. 1337 */ 1338 __be32 __init root_nfs_parse_addr(char *name) 1339 { 1340 __be32 addr; 1341 int octets = 0; 1342 char *cp, *cq; 1343 1344 cp = cq = name; 1345 while (octets < 4) { 1346 while (*cp >= '0' && *cp <= '9') 1347 cp++; 1348 if (cp == cq || cp - cq > 3) 1349 break; 1350 if (*cp == '.' || octets == 3) 1351 octets++; 1352 if (octets < 4) 1353 cp++; 1354 cq = cp; 1355 } 1356 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1357 if (*cp == ':') 1358 *cp++ = '\0'; 1359 addr = in_aton(name); 1360 memmove(name, cp, strlen(cp) + 1); 1361 } else 1362 addr = NONE; 1363 1364 return addr; 1365 } 1366 1367 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1368 1369 static int __init wait_for_devices(void) 1370 { 1371 int i; 1372 1373 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1374 struct net_device *dev; 1375 int found = 0; 1376 1377 rtnl_lock(); 1378 for_each_netdev(&init_net, dev) { 1379 if (ic_is_init_dev(dev)) { 1380 found = 1; 1381 break; 1382 } 1383 } 1384 rtnl_unlock(); 1385 if (found) 1386 return 0; 1387 ssleep(1); 1388 } 1389 return -ENODEV; 1390 } 1391 1392 /* 1393 * IP Autoconfig dispatcher. 1394 */ 1395 1396 static int __init ip_auto_config(void) 1397 { 1398 __be32 addr; 1399 #ifdef IPCONFIG_DYNAMIC 1400 int retries = CONF_OPEN_RETRIES; 1401 #endif 1402 int err; 1403 unsigned int i; 1404 1405 #ifdef CONFIG_PROC_FS 1406 proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops); 1407 #endif /* CONFIG_PROC_FS */ 1408 1409 if (!ic_enable) 1410 return 0; 1411 1412 pr_debug("IP-Config: Entered.\n"); 1413 #ifdef IPCONFIG_DYNAMIC 1414 try_try_again: 1415 #endif 1416 /* Wait for devices to appear */ 1417 err = wait_for_devices(); 1418 if (err) 1419 return err; 1420 1421 /* Setup all network devices */ 1422 err = ic_open_devs(); 1423 if (err) 1424 return err; 1425 1426 /* Give drivers a chance to settle */ 1427 msleep(CONF_POST_OPEN); 1428 1429 /* 1430 * If the config information is insufficient (e.g., our IP address or 1431 * IP address of the boot server is missing or we have multiple network 1432 * interfaces and no default was set), use BOOTP or RARP to get the 1433 * missing values. 1434 */ 1435 if (ic_myaddr == NONE || 1436 #ifdef CONFIG_ROOT_NFS 1437 (root_server_addr == NONE && 1438 ic_servaddr == NONE && 1439 ROOT_DEV == Root_NFS) || 1440 #endif 1441 ic_first_dev->next) { 1442 #ifdef IPCONFIG_DYNAMIC 1443 if (ic_dynamic() < 0) { 1444 ic_close_devs(); 1445 1446 /* 1447 * I don't know why, but sometimes the 1448 * eepro100 driver (at least) gets upset and 1449 * doesn't work the first time it's opened. 1450 * But then if you close it and reopen it, it 1451 * works just fine. So we need to try that at 1452 * least once before giving up. 1453 * 1454 * Also, if the root will be NFS-mounted, we 1455 * have nowhere to go if DHCP fails. So we 1456 * just have to keep trying forever. 1457 * 1458 * -- Chip 1459 */ 1460 #ifdef CONFIG_ROOT_NFS 1461 if (ROOT_DEV == Root_NFS) { 1462 pr_err("IP-Config: Retrying forever (NFS root)...\n"); 1463 goto try_try_again; 1464 } 1465 #endif 1466 1467 if (--retries) { 1468 pr_err("IP-Config: Reopening network devices...\n"); 1469 goto try_try_again; 1470 } 1471 1472 /* Oh, well. At least we tried. */ 1473 pr_err("IP-Config: Auto-configuration of network failed\n"); 1474 return -1; 1475 } 1476 #else /* !DYNAMIC */ 1477 pr_err("IP-Config: Incomplete network configuration information\n"); 1478 ic_close_devs(); 1479 return -1; 1480 #endif /* IPCONFIG_DYNAMIC */ 1481 } else { 1482 /* Device selected manually or only one device -> use it */ 1483 ic_dev = ic_first_dev; 1484 } 1485 1486 addr = root_nfs_parse_addr(root_server_path); 1487 if (root_server_addr == NONE) 1488 root_server_addr = addr; 1489 1490 /* 1491 * Use defaults wherever applicable. 1492 */ 1493 if (ic_defaults() < 0) 1494 return -1; 1495 1496 /* 1497 * Record which protocol was actually used. 1498 */ 1499 #ifdef IPCONFIG_DYNAMIC 1500 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1501 #endif 1502 1503 #ifndef IPCONFIG_SILENT 1504 /* 1505 * Clue in the operator. 1506 */ 1507 pr_info("IP-Config: Complete:\n"); 1508 1509 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", 1510 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr, 1511 &ic_myaddr, &ic_netmask, &ic_gateway); 1512 pr_info(" host=%s, domain=%s, nis-domain=%s\n", 1513 utsname()->nodename, ic_domain, utsname()->domainname); 1514 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", 1515 &ic_servaddr, &root_server_addr, root_server_path); 1516 if (ic_dev_mtu) 1517 pr_cont(", mtu=%d", ic_dev_mtu); 1518 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 1519 if (ic_nameservers[i] != NONE) { 1520 pr_cont(" nameserver%u=%pI4", 1521 i, &ic_nameservers[i]); 1522 break; 1523 } 1524 for (i++; i < CONF_NAMESERVERS_MAX; i++) 1525 if (ic_nameservers[i] != NONE) 1526 pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]); 1527 pr_cont("\n"); 1528 #endif /* !SILENT */ 1529 1530 /* 1531 * Close all network devices except the device we've 1532 * autoconfigured and set up routes. 1533 */ 1534 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1535 err = -1; 1536 else 1537 err = 0; 1538 1539 ic_close_devs(); 1540 1541 return err; 1542 } 1543 1544 late_initcall(ip_auto_config); 1545 1546 1547 /* 1548 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1549 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. 1550 */ 1551 static int __init ic_proto_name(char *name) 1552 { 1553 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1554 return 1; 1555 } 1556 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1557 return 0; 1558 } 1559 #ifdef CONFIG_IP_PNP_DHCP 1560 else if (!strncmp(name, "dhcp", 4)) { 1561 char *client_id; 1562 1563 ic_proto_enabled &= ~IC_RARP; 1564 client_id = strstr(name, "dhcp,"); 1565 if (client_id) { 1566 char *v; 1567 1568 client_id = client_id + 5; 1569 v = strchr(client_id, ','); 1570 if (!v) 1571 return 1; 1572 *v = 0; 1573 if (kstrtou8(client_id, 0, dhcp_client_identifier)) 1574 pr_debug("DHCP: Invalid client identifier type\n"); 1575 strncpy(dhcp_client_identifier + 1, v + 1, 251); 1576 *v = ','; 1577 } 1578 return 1; 1579 } 1580 #endif 1581 #ifdef CONFIG_IP_PNP_BOOTP 1582 else if (!strcmp(name, "bootp")) { 1583 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1584 return 1; 1585 } 1586 #endif 1587 #ifdef CONFIG_IP_PNP_RARP 1588 else if (!strcmp(name, "rarp")) { 1589 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1590 return 1; 1591 } 1592 #endif 1593 #ifdef IPCONFIG_DYNAMIC 1594 else if (!strcmp(name, "both")) { 1595 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1596 return 1; 1597 } 1598 #endif 1599 return 0; 1600 } 1601 1602 static int __init ip_auto_config_setup(char *addrs) 1603 { 1604 char *cp, *ip, *dp; 1605 int num = 0; 1606 1607 ic_set_manually = 1; 1608 ic_enable = 1; 1609 1610 /* 1611 * If any dhcp, bootp etc options are set, leave autoconfig on 1612 * and skip the below static IP processing. 1613 */ 1614 if (ic_proto_name(addrs)) 1615 return 1; 1616 1617 /* If no static IP is given, turn off autoconfig and bail. */ 1618 if (*addrs == 0 || 1619 strcmp(addrs, "off") == 0 || 1620 strcmp(addrs, "none") == 0) { 1621 ic_enable = 0; 1622 return 1; 1623 } 1624 1625 ic_nameservers_predef(); 1626 1627 /* Parse string for static IP assignment. */ 1628 ip = addrs; 1629 while (ip && *ip) { 1630 if ((cp = strchr(ip, ':'))) 1631 *cp++ = '\0'; 1632 if (strlen(ip) > 0) { 1633 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip); 1634 switch (num) { 1635 case 0: 1636 if ((ic_myaddr = in_aton(ip)) == ANY) 1637 ic_myaddr = NONE; 1638 break; 1639 case 1: 1640 if ((ic_servaddr = in_aton(ip)) == ANY) 1641 ic_servaddr = NONE; 1642 break; 1643 case 2: 1644 if ((ic_gateway = in_aton(ip)) == ANY) 1645 ic_gateway = NONE; 1646 break; 1647 case 3: 1648 if ((ic_netmask = in_aton(ip)) == ANY) 1649 ic_netmask = NONE; 1650 break; 1651 case 4: 1652 if ((dp = strchr(ip, '.'))) { 1653 *dp++ = '\0'; 1654 strlcpy(utsname()->domainname, dp, 1655 sizeof(utsname()->domainname)); 1656 } 1657 strlcpy(utsname()->nodename, ip, 1658 sizeof(utsname()->nodename)); 1659 ic_host_name_set = 1; 1660 break; 1661 case 5: 1662 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1663 break; 1664 case 6: 1665 if (ic_proto_name(ip) == 0 && 1666 ic_myaddr == NONE) { 1667 ic_enable = 0; 1668 } 1669 break; 1670 case 7: 1671 if (CONF_NAMESERVERS_MAX >= 1) { 1672 ic_nameservers[0] = in_aton(ip); 1673 if (ic_nameservers[0] == ANY) 1674 ic_nameservers[0] = NONE; 1675 } 1676 break; 1677 case 8: 1678 if (CONF_NAMESERVERS_MAX >= 2) { 1679 ic_nameservers[1] = in_aton(ip); 1680 if (ic_nameservers[1] == ANY) 1681 ic_nameservers[1] = NONE; 1682 } 1683 break; 1684 } 1685 } 1686 ip = cp; 1687 num++; 1688 } 1689 1690 return 1; 1691 } 1692 __setup("ip=", ip_auto_config_setup); 1693 1694 static int __init nfsaddrs_config_setup(char *addrs) 1695 { 1696 return ip_auto_config_setup(addrs); 1697 } 1698 __setup("nfsaddrs=", nfsaddrs_config_setup); 1699 1700 static int __init vendor_class_identifier_setup(char *addrs) 1701 { 1702 if (strlcpy(vendor_class_identifier, addrs, 1703 sizeof(vendor_class_identifier)) 1704 >= sizeof(vendor_class_identifier)) 1705 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n", 1706 vendor_class_identifier); 1707 return 1; 1708 } 1709 __setup("dhcpclass=", vendor_class_identifier_setup); 1710