1 /* 2 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or 3 * user-supplied information to configure own IP address and routes. 4 * 5 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz> 6 * 7 * Derived from network configuration code in fs/nfs/nfsroot.c, 8 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me. 9 * 10 * BOOTP rewritten to construct and analyse packets itself instead 11 * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--; 12 * -- MJ, December 1998 13 * 14 * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic" 15 * initialization scheme. 16 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999 17 * 18 * DHCP support added. To users this looks like a whole separate 19 * protocol, but we know it's just a bag on the side of BOOTP. 20 * -- Chip Salzenberg <chip@valinux.com>, May 2000 21 * 22 * Ported DHCP support from 2.2.16 to 2.4.0-test4 23 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000 24 * 25 * Merged changes from 2.2.19 into 2.4.3 26 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001 27 * 28 * Multiple Nameservers in /proc/net/pnp 29 * -- Josef Siemes <jsiemes@web.de>, Aug 2002 30 */ 31 32 #include <linux/types.h> 33 #include <linux/string.h> 34 #include <linux/kernel.h> 35 #include <linux/jiffies.h> 36 #include <linux/random.h> 37 #include <linux/init.h> 38 #include <linux/utsname.h> 39 #include <linux/in.h> 40 #include <linux/if.h> 41 #include <linux/inet.h> 42 #include <linux/inetdevice.h> 43 #include <linux/netdevice.h> 44 #include <linux/if_arp.h> 45 #include <linux/skbuff.h> 46 #include <linux/ip.h> 47 #include <linux/socket.h> 48 #include <linux/route.h> 49 #include <linux/udp.h> 50 #include <linux/proc_fs.h> 51 #include <linux/seq_file.h> 52 #include <linux/major.h> 53 #include <linux/root_dev.h> 54 #include <linux/delay.h> 55 #include <linux/nfs_fs.h> 56 #include <linux/slab.h> 57 #include <linux/export.h> 58 #include <net/net_namespace.h> 59 #include <net/arp.h> 60 #include <net/dsa.h> 61 #include <net/ip.h> 62 #include <net/ipconfig.h> 63 #include <net/route.h> 64 65 #include <linux/uaccess.h> 66 #include <net/checksum.h> 67 #include <asm/processor.h> 68 69 #if defined(CONFIG_IP_PNP_DHCP) 70 #define IPCONFIG_DHCP 71 #endif 72 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) 73 #define IPCONFIG_BOOTP 74 #endif 75 #if defined(CONFIG_IP_PNP_RARP) 76 #define IPCONFIG_RARP 77 #endif 78 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) 79 #define IPCONFIG_DYNAMIC 80 #endif 81 82 /* Define the friendly delay before and after opening net devices */ 83 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */ 84 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */ 85 86 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ 87 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ 88 #define CONF_SEND_RETRIES 6 /* Send six requests per open */ 89 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ 90 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ 91 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ 92 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ 93 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers 94 - '3' from resolv.h */ 95 96 #define NONE cpu_to_be32(INADDR_NONE) 97 #define ANY cpu_to_be32(INADDR_ANY) 98 99 /* 100 * Public IP configuration 101 */ 102 103 /* This is used by platforms which might be able to set the ipconfig 104 * variables using firmware environment vars. If this is set, it will 105 * ignore such firmware variables. 106 */ 107 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ 108 109 static int ic_enable __initdata; /* IP config enabled? */ 110 111 /* Protocol choice */ 112 int ic_proto_enabled __initdata = 0 113 #ifdef IPCONFIG_BOOTP 114 | IC_BOOTP 115 #endif 116 #ifdef CONFIG_IP_PNP_DHCP 117 | IC_USE_DHCP 118 #endif 119 #ifdef IPCONFIG_RARP 120 | IC_RARP 121 #endif 122 ; 123 124 static int ic_host_name_set __initdata; /* Host name set by us? */ 125 126 __be32 ic_myaddr = NONE; /* My IP address */ 127 static __be32 ic_netmask = NONE; /* Netmask for local subnet */ 128 __be32 ic_gateway = NONE; /* Gateway IP address */ 129 130 #ifdef IPCONFIG_DYNAMIC 131 static __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */ 132 #endif 133 134 __be32 ic_servaddr = NONE; /* Boot server IP address */ 135 136 __be32 root_server_addr = NONE; /* Address of NFS server */ 137 u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 138 139 /* vendor class identifier */ 140 static char vendor_class_identifier[253] __initdata; 141 142 #if defined(CONFIG_IP_PNP_DHCP) 143 static char dhcp_client_identifier[253] __initdata; 144 #endif 145 146 /* Persistent data: */ 147 148 #ifdef IPCONFIG_DYNAMIC 149 static int ic_proto_used; /* Protocol used, if any */ 150 #else 151 #define ic_proto_used 0 152 #endif 153 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 154 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 155 156 /* 157 * Private state. 158 */ 159 160 /* Name of user-selected boot device */ 161 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 162 163 /* Protocols supported by available interfaces */ 164 static int ic_proto_have_if __initdata; 165 166 /* MTU for boot device */ 167 static int ic_dev_mtu __initdata; 168 169 #ifdef IPCONFIG_DYNAMIC 170 static DEFINE_SPINLOCK(ic_recv_lock); 171 static volatile int ic_got_reply __initdata; /* Proto(s) that replied */ 172 #endif 173 #ifdef IPCONFIG_DHCP 174 static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */ 175 #endif 176 177 178 /* 179 * Network devices 180 */ 181 182 struct ic_device { 183 struct ic_device *next; 184 struct net_device *dev; 185 unsigned short flags; 186 short able; 187 __be32 xid; 188 }; 189 190 static struct ic_device *ic_first_dev __initdata; /* List of open device */ 191 static struct ic_device *ic_dev __initdata; /* Selected device */ 192 193 static bool __init ic_is_init_dev(struct net_device *dev) 194 { 195 if (dev->flags & IFF_LOOPBACK) 196 return false; 197 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 198 (!(dev->flags & IFF_LOOPBACK) && 199 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 200 strncmp(dev->name, "dummy", 5)); 201 } 202 203 static int __init ic_open_devs(void) 204 { 205 struct ic_device *d, **last; 206 struct net_device *dev; 207 unsigned short oflags; 208 unsigned long start, next_msg; 209 210 last = &ic_first_dev; 211 rtnl_lock(); 212 213 /* bring loopback and DSA master network devices up first */ 214 for_each_netdev(&init_net, dev) { 215 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev)) 216 continue; 217 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) 218 pr_err("IP-Config: Failed to open %s\n", dev->name); 219 } 220 221 for_each_netdev(&init_net, dev) { 222 if (ic_is_init_dev(dev)) { 223 int able = 0; 224 if (dev->mtu >= 364) 225 able |= IC_BOOTP; 226 else 227 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n", 228 dev->name, dev->mtu); 229 if (!(dev->flags & IFF_NOARP)) 230 able |= IC_RARP; 231 able &= ic_proto_enabled; 232 if (ic_proto_enabled && !able) 233 continue; 234 oflags = dev->flags; 235 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 236 pr_err("IP-Config: Failed to open %s\n", 237 dev->name); 238 continue; 239 } 240 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 241 rtnl_unlock(); 242 return -ENOMEM; 243 } 244 d->dev = dev; 245 *last = d; 246 last = &d->next; 247 d->flags = oflags; 248 d->able = able; 249 if (able & IC_BOOTP) 250 get_random_bytes(&d->xid, sizeof(__be32)); 251 else 252 d->xid = 0; 253 ic_proto_have_if |= able; 254 pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n", 255 dev->name, able, d->xid); 256 } 257 } 258 259 /* no point in waiting if we could not bring up at least one device */ 260 if (!ic_first_dev) 261 goto have_carrier; 262 263 /* wait for a carrier on at least one device */ 264 start = jiffies; 265 next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12); 266 while (time_before(jiffies, start + 267 msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) { 268 int wait, elapsed; 269 270 for_each_netdev(&init_net, dev) 271 if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) 272 goto have_carrier; 273 274 msleep(1); 275 276 if (time_before(jiffies, next_msg)) 277 continue; 278 279 elapsed = jiffies_to_msecs(jiffies - start); 280 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000; 281 pr_info("Waiting up to %d more seconds for network.\n", wait); 282 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12); 283 } 284 have_carrier: 285 rtnl_unlock(); 286 287 *last = NULL; 288 289 if (!ic_first_dev) { 290 if (user_dev_name[0]) 291 pr_err("IP-Config: Device `%s' not found\n", 292 user_dev_name); 293 else 294 pr_err("IP-Config: No network devices available\n"); 295 return -ENODEV; 296 } 297 return 0; 298 } 299 300 static void __init ic_close_devs(void) 301 { 302 struct ic_device *d, *next; 303 struct net_device *dev; 304 305 rtnl_lock(); 306 next = ic_first_dev; 307 while ((d = next)) { 308 next = d->next; 309 dev = d->dev; 310 if (d != ic_dev && !netdev_uses_dsa(dev)) { 311 pr_debug("IP-Config: Downing %s\n", dev->name); 312 dev_change_flags(dev, d->flags); 313 } 314 kfree(d); 315 } 316 rtnl_unlock(); 317 } 318 319 /* 320 * Interface to various network functions. 321 */ 322 323 static inline void 324 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 325 { 326 sin->sin_family = AF_INET; 327 sin->sin_addr.s_addr = addr; 328 sin->sin_port = port; 329 } 330 331 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg) 332 { 333 int res; 334 335 mm_segment_t oldfs = get_fs(); 336 set_fs(get_ds()); 337 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 338 set_fs(oldfs); 339 return res; 340 } 341 342 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 343 { 344 int res; 345 346 mm_segment_t oldfs = get_fs(); 347 set_fs(get_ds()); 348 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 349 set_fs(oldfs); 350 return res; 351 } 352 353 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 354 { 355 int res; 356 357 mm_segment_t oldfs = get_fs(); 358 set_fs(get_ds()); 359 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); 360 set_fs(oldfs); 361 return res; 362 } 363 364 /* 365 * Set up interface addresses and routes. 366 */ 367 368 static int __init ic_setup_if(void) 369 { 370 struct ifreq ir; 371 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 372 int err; 373 374 memset(&ir, 0, sizeof(ir)); 375 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name); 376 set_sockaddr(sin, ic_myaddr, 0); 377 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) { 378 pr_err("IP-Config: Unable to set interface address (%d)\n", 379 err); 380 return -1; 381 } 382 set_sockaddr(sin, ic_netmask, 0); 383 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 384 pr_err("IP-Config: Unable to set interface netmask (%d)\n", 385 err); 386 return -1; 387 } 388 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 389 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 390 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n", 391 err); 392 return -1; 393 } 394 /* Handle the case where we need non-standard MTU on the boot link (a network 395 * using jumbo frames, for instance). If we can't set the mtu, don't error 396 * out, we'll try to muddle along. 397 */ 398 if (ic_dev_mtu != 0) { 399 strcpy(ir.ifr_name, ic_dev->dev->name); 400 ir.ifr_mtu = ic_dev_mtu; 401 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0) 402 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", 403 ic_dev_mtu, err); 404 } 405 return 0; 406 } 407 408 static int __init ic_setup_routes(void) 409 { 410 /* No need to setup device routes, only the default route... */ 411 412 if (ic_gateway != NONE) { 413 struct rtentry rm; 414 int err; 415 416 memset(&rm, 0, sizeof(rm)); 417 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 418 pr_err("IP-Config: Gateway not on directly connected network\n"); 419 return -1; 420 } 421 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 422 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 423 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 424 rm.rt_flags = RTF_UP | RTF_GATEWAY; 425 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 426 pr_err("IP-Config: Cannot add default route (%d)\n", 427 err); 428 return -1; 429 } 430 } 431 432 return 0; 433 } 434 435 /* 436 * Fill in default values for all missing parameters. 437 */ 438 439 static int __init ic_defaults(void) 440 { 441 /* 442 * At this point we have no userspace running so need not 443 * claim locks on system_utsname 444 */ 445 446 if (!ic_host_name_set) 447 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 448 449 if (root_server_addr == NONE) 450 root_server_addr = ic_servaddr; 451 452 if (ic_netmask == NONE) { 453 if (IN_CLASSA(ntohl(ic_myaddr))) 454 ic_netmask = htonl(IN_CLASSA_NET); 455 else if (IN_CLASSB(ntohl(ic_myaddr))) 456 ic_netmask = htonl(IN_CLASSB_NET); 457 else if (IN_CLASSC(ntohl(ic_myaddr))) 458 ic_netmask = htonl(IN_CLASSC_NET); 459 else { 460 pr_err("IP-Config: Unable to guess netmask for address %pI4\n", 461 &ic_myaddr); 462 return -1; 463 } 464 pr_notice("IP-Config: Guessing netmask %pI4\n", 465 &ic_netmask); 466 } 467 468 return 0; 469 } 470 471 /* 472 * RARP support. 473 */ 474 475 #ifdef IPCONFIG_RARP 476 477 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 478 479 static struct packet_type rarp_packet_type __initdata = { 480 .type = cpu_to_be16(ETH_P_RARP), 481 .func = ic_rarp_recv, 482 }; 483 484 static inline void __init ic_rarp_init(void) 485 { 486 dev_add_pack(&rarp_packet_type); 487 } 488 489 static inline void __init ic_rarp_cleanup(void) 490 { 491 dev_remove_pack(&rarp_packet_type); 492 } 493 494 /* 495 * Process received RARP packet. 496 */ 497 static int __init 498 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 499 { 500 struct arphdr *rarp; 501 unsigned char *rarp_ptr; 502 __be32 sip, tip; 503 unsigned char *tha; /* t for "target" */ 504 struct ic_device *d; 505 506 if (!net_eq(dev_net(dev), &init_net)) 507 goto drop; 508 509 skb = skb_share_check(skb, GFP_ATOMIC); 510 if (!skb) 511 return NET_RX_DROP; 512 513 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 514 goto drop; 515 516 /* Basic sanity checks can be done without the lock. */ 517 rarp = (struct arphdr *)skb_transport_header(skb); 518 519 /* If this test doesn't pass, it's not IP, or we should 520 * ignore it anyway. 521 */ 522 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 523 goto drop; 524 525 /* If it's not a RARP reply, delete it. */ 526 if (rarp->ar_op != htons(ARPOP_RREPLY)) 527 goto drop; 528 529 /* If it's not Ethernet, delete it. */ 530 if (rarp->ar_pro != htons(ETH_P_IP)) 531 goto drop; 532 533 if (!pskb_may_pull(skb, arp_hdr_len(dev))) 534 goto drop; 535 536 /* OK, it is all there and looks valid, process... */ 537 rarp = (struct arphdr *)skb_transport_header(skb); 538 rarp_ptr = (unsigned char *) (rarp + 1); 539 540 /* One reply at a time, please. */ 541 spin_lock(&ic_recv_lock); 542 543 /* If we already have a reply, just drop the packet */ 544 if (ic_got_reply) 545 goto drop_unlock; 546 547 /* Find the ic_device that the packet arrived on */ 548 d = ic_first_dev; 549 while (d && d->dev != dev) 550 d = d->next; 551 if (!d) 552 goto drop_unlock; /* should never happen */ 553 554 /* Extract variable-width fields */ 555 rarp_ptr += dev->addr_len; 556 memcpy(&sip, rarp_ptr, 4); 557 rarp_ptr += 4; 558 tha = rarp_ptr; 559 rarp_ptr += dev->addr_len; 560 memcpy(&tip, rarp_ptr, 4); 561 562 /* Discard packets which are not meant for us. */ 563 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 564 goto drop_unlock; 565 566 /* Discard packets which are not from specified server. */ 567 if (ic_servaddr != NONE && ic_servaddr != sip) 568 goto drop_unlock; 569 570 /* We have a winner! */ 571 ic_dev = d; 572 if (ic_myaddr == NONE) 573 ic_myaddr = tip; 574 ic_servaddr = sip; 575 ic_addrservaddr = sip; 576 ic_got_reply = IC_RARP; 577 578 drop_unlock: 579 /* Show's over. Nothing to see here. */ 580 spin_unlock(&ic_recv_lock); 581 582 drop: 583 /* Throw the packet out. */ 584 kfree_skb(skb); 585 return 0; 586 } 587 588 589 /* 590 * Send RARP request packet over a single interface. 591 */ 592 static void __init ic_rarp_send_if(struct ic_device *d) 593 { 594 struct net_device *dev = d->dev; 595 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 596 dev->dev_addr, dev->dev_addr); 597 } 598 #endif 599 600 /* 601 * Predefine Nameservers 602 */ 603 static inline void __init ic_nameservers_predef(void) 604 { 605 int i; 606 607 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 608 ic_nameservers[i] = NONE; 609 } 610 611 /* 612 * DHCP/BOOTP support. 613 */ 614 615 #ifdef IPCONFIG_BOOTP 616 617 struct bootp_pkt { /* BOOTP packet format */ 618 struct iphdr iph; /* IP header */ 619 struct udphdr udph; /* UDP header */ 620 u8 op; /* 1=request, 2=reply */ 621 u8 htype; /* HW address type */ 622 u8 hlen; /* HW address length */ 623 u8 hops; /* Used only by gateways */ 624 __be32 xid; /* Transaction ID */ 625 __be16 secs; /* Seconds since we started */ 626 __be16 flags; /* Just what it says */ 627 __be32 client_ip; /* Client's IP address if known */ 628 __be32 your_ip; /* Assigned IP address */ 629 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 630 __be32 relay_ip; /* IP address of BOOTP relay */ 631 u8 hw_addr[16]; /* Client's HW address */ 632 u8 serv_name[64]; /* Server host name */ 633 u8 boot_file[128]; /* Name of boot file */ 634 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 635 }; 636 637 /* packet ops */ 638 #define BOOTP_REQUEST 1 639 #define BOOTP_REPLY 2 640 641 /* DHCP message types */ 642 #define DHCPDISCOVER 1 643 #define DHCPOFFER 2 644 #define DHCPREQUEST 3 645 #define DHCPDECLINE 4 646 #define DHCPACK 5 647 #define DHCPNAK 6 648 #define DHCPRELEASE 7 649 #define DHCPINFORM 8 650 651 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 652 653 static struct packet_type bootp_packet_type __initdata = { 654 .type = cpu_to_be16(ETH_P_IP), 655 .func = ic_bootp_recv, 656 }; 657 658 /* 659 * Initialize DHCP/BOOTP extension fields in the request. 660 */ 661 662 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 663 664 #ifdef IPCONFIG_DHCP 665 666 static void __init 667 ic_dhcp_init_options(u8 *options, struct ic_device *d) 668 { 669 u8 mt = ((ic_servaddr == NONE) 670 ? DHCPDISCOVER : DHCPREQUEST); 671 u8 *e = options; 672 int len; 673 674 pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name); 675 676 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 677 e += 4; 678 679 *e++ = 53; /* DHCP message type */ 680 *e++ = 1; 681 *e++ = mt; 682 683 if (mt == DHCPREQUEST) { 684 *e++ = 54; /* Server ID (IP address) */ 685 *e++ = 4; 686 memcpy(e, &ic_servaddr, 4); 687 e += 4; 688 689 *e++ = 50; /* Requested IP address */ 690 *e++ = 4; 691 memcpy(e, &ic_myaddr, 4); 692 e += 4; 693 } 694 695 /* always? */ 696 { 697 static const u8 ic_req_params[] = { 698 1, /* Subnet mask */ 699 3, /* Default gateway */ 700 6, /* DNS server */ 701 12, /* Host name */ 702 15, /* Domain name */ 703 17, /* Boot path */ 704 26, /* MTU */ 705 40, /* NIS domain name */ 706 }; 707 708 *e++ = 55; /* Parameter request list */ 709 *e++ = sizeof(ic_req_params); 710 memcpy(e, ic_req_params, sizeof(ic_req_params)); 711 e += sizeof(ic_req_params); 712 713 if (ic_host_name_set) { 714 *e++ = 12; /* host-name */ 715 len = strlen(utsname()->nodename); 716 *e++ = len; 717 memcpy(e, utsname()->nodename, len); 718 e += len; 719 } 720 if (*vendor_class_identifier) { 721 pr_info("DHCP: sending class identifier \"%s\"\n", 722 vendor_class_identifier); 723 *e++ = 60; /* Class-identifier */ 724 len = strlen(vendor_class_identifier); 725 *e++ = len; 726 memcpy(e, vendor_class_identifier, len); 727 e += len; 728 } 729 len = strlen(dhcp_client_identifier + 1); 730 /* the minimum length of identifier is 2, include 1 byte type, 731 * and can not be larger than the length of options 732 */ 733 if (len >= 1 && len < 312 - (e - options) - 1) { 734 *e++ = 61; 735 *e++ = len + 1; 736 memcpy(e, dhcp_client_identifier, len + 1); 737 e += len + 1; 738 } 739 } 740 741 *e++ = 255; /* End of the list */ 742 } 743 744 #endif /* IPCONFIG_DHCP */ 745 746 static void __init ic_bootp_init_ext(u8 *e) 747 { 748 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 749 e += 4; 750 *e++ = 1; /* Subnet mask request */ 751 *e++ = 4; 752 e += 4; 753 *e++ = 3; /* Default gateway request */ 754 *e++ = 4; 755 e += 4; 756 *e++ = 5; /* Name server request */ 757 *e++ = 8; 758 e += 8; 759 *e++ = 12; /* Host name request */ 760 *e++ = 32; 761 e += 32; 762 *e++ = 40; /* NIS Domain name request */ 763 *e++ = 32; 764 e += 32; 765 *e++ = 17; /* Boot path */ 766 *e++ = 40; 767 e += 40; 768 769 *e++ = 57; /* set extension buffer size for reply */ 770 *e++ = 2; 771 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 772 *e++ = 150; 773 774 *e++ = 255; /* End of the list */ 775 } 776 777 778 /* 779 * Initialize the DHCP/BOOTP mechanism. 780 */ 781 static inline void __init ic_bootp_init(void) 782 { 783 ic_nameservers_predef(); 784 785 dev_add_pack(&bootp_packet_type); 786 } 787 788 789 /* 790 * DHCP/BOOTP cleanup. 791 */ 792 static inline void __init ic_bootp_cleanup(void) 793 { 794 dev_remove_pack(&bootp_packet_type); 795 } 796 797 798 /* 799 * Send DHCP/BOOTP request to single interface. 800 */ 801 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 802 { 803 struct net_device *dev = d->dev; 804 struct sk_buff *skb; 805 struct bootp_pkt *b; 806 struct iphdr *h; 807 int hlen = LL_RESERVED_SPACE(dev); 808 int tlen = dev->needed_tailroom; 809 810 /* Allocate packet */ 811 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, 812 GFP_KERNEL); 813 if (!skb) 814 return; 815 skb_reserve(skb, hlen); 816 b = skb_put_zero(skb, sizeof(struct bootp_pkt)); 817 818 /* Construct IP header */ 819 skb_reset_network_header(skb); 820 h = ip_hdr(skb); 821 h->version = 4; 822 h->ihl = 5; 823 h->tot_len = htons(sizeof(struct bootp_pkt)); 824 h->frag_off = htons(IP_DF); 825 h->ttl = 64; 826 h->protocol = IPPROTO_UDP; 827 h->daddr = htonl(INADDR_BROADCAST); 828 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 829 830 /* Construct UDP header */ 831 b->udph.source = htons(68); 832 b->udph.dest = htons(67); 833 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 834 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 835 836 /* Construct DHCP/BOOTP header */ 837 b->op = BOOTP_REQUEST; 838 if (dev->type < 256) /* check for false types */ 839 b->htype = dev->type; 840 else if (dev->type == ARPHRD_FDDI) 841 b->htype = ARPHRD_ETHER; 842 else { 843 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type, 844 dev->name); 845 b->htype = dev->type; /* can cause undefined behavior */ 846 } 847 848 /* server_ip and your_ip address are both already zero per RFC2131 */ 849 b->hlen = dev->addr_len; 850 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 851 b->secs = htons(jiffies_diff / HZ); 852 b->xid = d->xid; 853 854 /* add DHCP options or BOOTP extensions */ 855 #ifdef IPCONFIG_DHCP 856 if (ic_proto_enabled & IC_USE_DHCP) 857 ic_dhcp_init_options(b->exten, d); 858 else 859 #endif 860 ic_bootp_init_ext(b->exten); 861 862 /* Chain packet down the line... */ 863 skb->dev = dev; 864 skb->protocol = htons(ETH_P_IP); 865 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 866 dev->broadcast, dev->dev_addr, skb->len) < 0) { 867 kfree_skb(skb); 868 printk("E"); 869 return; 870 } 871 872 if (dev_queue_xmit(skb) < 0) 873 printk("E"); 874 } 875 876 877 /* 878 * Copy BOOTP-supplied string if not already set. 879 */ 880 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 881 { 882 if (!len) 883 return 0; 884 if (len > max-1) 885 len = max-1; 886 memcpy(dest, src, len); 887 dest[len] = '\0'; 888 return 1; 889 } 890 891 892 /* 893 * Process BOOTP extensions. 894 */ 895 static void __init ic_do_bootp_ext(u8 *ext) 896 { 897 u8 servers; 898 int i; 899 __be16 mtu; 900 901 u8 *c; 902 903 pr_debug("DHCP/BOOTP: Got extension %d:", *ext); 904 for (c=ext+2; c<ext+2+ext[1]; c++) 905 pr_debug(" %02x", *c); 906 pr_debug("\n"); 907 908 switch (*ext++) { 909 case 1: /* Subnet mask */ 910 if (ic_netmask == NONE) 911 memcpy(&ic_netmask, ext+1, 4); 912 break; 913 case 3: /* Default gateway */ 914 if (ic_gateway == NONE) 915 memcpy(&ic_gateway, ext+1, 4); 916 break; 917 case 6: /* DNS server */ 918 servers= *ext/4; 919 if (servers > CONF_NAMESERVERS_MAX) 920 servers = CONF_NAMESERVERS_MAX; 921 for (i = 0; i < servers; i++) { 922 if (ic_nameservers[i] == NONE) 923 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 924 } 925 break; 926 case 12: /* Host name */ 927 ic_bootp_string(utsname()->nodename, ext+1, *ext, 928 __NEW_UTS_LEN); 929 ic_host_name_set = 1; 930 break; 931 case 15: /* Domain name (DNS) */ 932 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 933 break; 934 case 17: /* Root path */ 935 if (!root_server_path[0]) 936 ic_bootp_string(root_server_path, ext+1, *ext, 937 sizeof(root_server_path)); 938 break; 939 case 26: /* Interface MTU */ 940 memcpy(&mtu, ext+1, sizeof(mtu)); 941 ic_dev_mtu = ntohs(mtu); 942 break; 943 case 40: /* NIS Domain name (_not_ DNS) */ 944 ic_bootp_string(utsname()->domainname, ext+1, *ext, 945 __NEW_UTS_LEN); 946 break; 947 } 948 } 949 950 951 /* 952 * Receive BOOTP reply. 953 */ 954 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 955 { 956 struct bootp_pkt *b; 957 struct iphdr *h; 958 struct ic_device *d; 959 int len, ext_len; 960 961 if (!net_eq(dev_net(dev), &init_net)) 962 goto drop; 963 964 /* Perform verifications before taking the lock. */ 965 if (skb->pkt_type == PACKET_OTHERHOST) 966 goto drop; 967 968 skb = skb_share_check(skb, GFP_ATOMIC); 969 if (!skb) 970 return NET_RX_DROP; 971 972 if (!pskb_may_pull(skb, 973 sizeof(struct iphdr) + 974 sizeof(struct udphdr))) 975 goto drop; 976 977 b = (struct bootp_pkt *)skb_network_header(skb); 978 h = &b->iph; 979 980 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 981 goto drop; 982 983 /* Fragments are not supported */ 984 if (ip_is_fragment(h)) { 985 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); 986 goto drop; 987 } 988 989 if (skb->len < ntohs(h->tot_len)) 990 goto drop; 991 992 if (ip_fast_csum((char *) h, h->ihl)) 993 goto drop; 994 995 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 996 goto drop; 997 998 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 999 goto drop; 1000 1001 len = ntohs(b->udph.len) - sizeof(struct udphdr); 1002 ext_len = len - (sizeof(*b) - 1003 sizeof(struct iphdr) - 1004 sizeof(struct udphdr) - 1005 sizeof(b->exten)); 1006 if (ext_len < 0) 1007 goto drop; 1008 1009 /* Ok the front looks good, make sure we can get at the rest. */ 1010 if (!pskb_may_pull(skb, skb->len)) 1011 goto drop; 1012 1013 b = (struct bootp_pkt *)skb_network_header(skb); 1014 h = &b->iph; 1015 1016 /* One reply at a time, please. */ 1017 spin_lock(&ic_recv_lock); 1018 1019 /* If we already have a reply, just drop the packet */ 1020 if (ic_got_reply) 1021 goto drop_unlock; 1022 1023 /* Find the ic_device that the packet arrived on */ 1024 d = ic_first_dev; 1025 while (d && d->dev != dev) 1026 d = d->next; 1027 if (!d) 1028 goto drop_unlock; /* should never happen */ 1029 1030 /* Is it a reply to our BOOTP request? */ 1031 if (b->op != BOOTP_REPLY || 1032 b->xid != d->xid) { 1033 net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n", 1034 d->dev->name, b->op, b->xid); 1035 goto drop_unlock; 1036 } 1037 1038 /* Parse extensions */ 1039 if (ext_len >= 4 && 1040 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1041 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1042 u8 *ext; 1043 1044 #ifdef IPCONFIG_DHCP 1045 if (ic_proto_enabled & IC_USE_DHCP) { 1046 __be32 server_id = NONE; 1047 int mt = 0; 1048 1049 ext = &b->exten[4]; 1050 while (ext < end && *ext != 0xff) { 1051 u8 *opt = ext++; 1052 if (*opt == 0) /* Padding */ 1053 continue; 1054 ext += *ext + 1; 1055 if (ext >= end) 1056 break; 1057 switch (*opt) { 1058 case 53: /* Message type */ 1059 if (opt[1]) 1060 mt = opt[2]; 1061 break; 1062 case 54: /* Server ID (IP address) */ 1063 if (opt[1] >= 4) 1064 memcpy(&server_id, opt + 2, 4); 1065 break; 1066 } 1067 } 1068 1069 pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name); 1070 1071 switch (mt) { 1072 case DHCPOFFER: 1073 /* While in the process of accepting one offer, 1074 * ignore all others. 1075 */ 1076 if (ic_myaddr != NONE) 1077 goto drop_unlock; 1078 1079 /* Let's accept that offer. */ 1080 ic_myaddr = b->your_ip; 1081 ic_servaddr = server_id; 1082 pr_debug("DHCP: Offered address %pI4 by server %pI4\n", 1083 &ic_myaddr, &b->iph.saddr); 1084 /* The DHCP indicated server address takes 1085 * precedence over the bootp header one if 1086 * they are different. 1087 */ 1088 if ((server_id != NONE) && 1089 (b->server_ip != server_id)) 1090 b->server_ip = ic_servaddr; 1091 break; 1092 1093 case DHCPACK: 1094 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1095 goto drop_unlock; 1096 1097 /* Yeah! */ 1098 break; 1099 1100 default: 1101 /* Urque. Forget it*/ 1102 ic_myaddr = NONE; 1103 ic_servaddr = NONE; 1104 goto drop_unlock; 1105 } 1106 1107 ic_dhcp_msgtype = mt; 1108 1109 } 1110 #endif /* IPCONFIG_DHCP */ 1111 1112 ext = &b->exten[4]; 1113 while (ext < end && *ext != 0xff) { 1114 u8 *opt = ext++; 1115 if (*opt == 0) /* Padding */ 1116 continue; 1117 ext += *ext + 1; 1118 if (ext < end) 1119 ic_do_bootp_ext(opt); 1120 } 1121 } 1122 1123 /* We have a winner! */ 1124 ic_dev = d; 1125 ic_myaddr = b->your_ip; 1126 ic_servaddr = b->server_ip; 1127 ic_addrservaddr = b->iph.saddr; 1128 if (ic_gateway == NONE && b->relay_ip) 1129 ic_gateway = b->relay_ip; 1130 if (ic_nameservers[0] == NONE) 1131 ic_nameservers[0] = ic_servaddr; 1132 ic_got_reply = IC_BOOTP; 1133 1134 drop_unlock: 1135 /* Show's over. Nothing to see here. */ 1136 spin_unlock(&ic_recv_lock); 1137 1138 drop: 1139 /* Throw the packet out. */ 1140 kfree_skb(skb); 1141 1142 return 0; 1143 } 1144 1145 1146 #endif 1147 1148 1149 /* 1150 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1151 */ 1152 1153 #ifdef IPCONFIG_DYNAMIC 1154 1155 static int __init ic_dynamic(void) 1156 { 1157 int retries; 1158 struct ic_device *d; 1159 unsigned long start_jiffies, timeout, jiff; 1160 int do_bootp = ic_proto_have_if & IC_BOOTP; 1161 int do_rarp = ic_proto_have_if & IC_RARP; 1162 1163 /* 1164 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1165 * This routine gets only called when some pieces of information 1166 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1167 */ 1168 if (!ic_proto_enabled) { 1169 pr_err("IP-Config: Incomplete network configuration information\n"); 1170 return -1; 1171 } 1172 1173 #ifdef IPCONFIG_BOOTP 1174 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1175 pr_err("DHCP/BOOTP: No suitable device found\n"); 1176 #endif 1177 #ifdef IPCONFIG_RARP 1178 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1179 pr_err("RARP: No suitable device found\n"); 1180 #endif 1181 1182 if (!ic_proto_have_if) 1183 /* Error message already printed */ 1184 return -1; 1185 1186 /* 1187 * Setup protocols 1188 */ 1189 #ifdef IPCONFIG_BOOTP 1190 if (do_bootp) 1191 ic_bootp_init(); 1192 #endif 1193 #ifdef IPCONFIG_RARP 1194 if (do_rarp) 1195 ic_rarp_init(); 1196 #endif 1197 1198 /* 1199 * Send requests and wait, until we get an answer. This loop 1200 * seems to be a terrible waste of CPU time, but actually there is 1201 * only one process running at all, so we don't need to use any 1202 * scheduler functions. 1203 * [Actually we could now, but the nothing else running note still 1204 * applies.. - AC] 1205 */ 1206 pr_notice("Sending %s%s%s requests .", 1207 do_bootp 1208 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1209 (do_bootp && do_rarp) ? " and " : "", 1210 do_rarp ? "RARP" : ""); 1211 1212 start_jiffies = jiffies; 1213 d = ic_first_dev; 1214 retries = CONF_SEND_RETRIES; 1215 get_random_bytes(&timeout, sizeof(timeout)); 1216 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); 1217 for (;;) { 1218 #ifdef IPCONFIG_BOOTP 1219 if (do_bootp && (d->able & IC_BOOTP)) 1220 ic_bootp_send_if(d, jiffies - start_jiffies); 1221 #endif 1222 #ifdef IPCONFIG_RARP 1223 if (do_rarp && (d->able & IC_RARP)) 1224 ic_rarp_send_if(d); 1225 #endif 1226 1227 if (!d->next) { 1228 jiff = jiffies + timeout; 1229 while (time_before(jiffies, jiff) && !ic_got_reply) 1230 schedule_timeout_uninterruptible(1); 1231 } 1232 #ifdef IPCONFIG_DHCP 1233 /* DHCP isn't done until we get a DHCPACK. */ 1234 if ((ic_got_reply & IC_BOOTP) && 1235 (ic_proto_enabled & IC_USE_DHCP) && 1236 ic_dhcp_msgtype != DHCPACK) { 1237 ic_got_reply = 0; 1238 /* continue on device that got the reply */ 1239 d = ic_dev; 1240 pr_cont(","); 1241 continue; 1242 } 1243 #endif /* IPCONFIG_DHCP */ 1244 1245 if (ic_got_reply) { 1246 pr_cont(" OK\n"); 1247 break; 1248 } 1249 1250 if ((d = d->next)) 1251 continue; 1252 1253 if (! --retries) { 1254 pr_cont(" timed out!\n"); 1255 break; 1256 } 1257 1258 d = ic_first_dev; 1259 1260 timeout = timeout CONF_TIMEOUT_MULT; 1261 if (timeout > CONF_TIMEOUT_MAX) 1262 timeout = CONF_TIMEOUT_MAX; 1263 1264 pr_cont("."); 1265 } 1266 1267 #ifdef IPCONFIG_BOOTP 1268 if (do_bootp) 1269 ic_bootp_cleanup(); 1270 #endif 1271 #ifdef IPCONFIG_RARP 1272 if (do_rarp) 1273 ic_rarp_cleanup(); 1274 #endif 1275 1276 if (!ic_got_reply) { 1277 ic_myaddr = NONE; 1278 return -1; 1279 } 1280 1281 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n", 1282 ((ic_got_reply & IC_RARP) ? "RARP" 1283 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1284 &ic_addrservaddr, &ic_myaddr); 1285 1286 return 0; 1287 } 1288 1289 #endif /* IPCONFIG_DYNAMIC */ 1290 1291 #ifdef CONFIG_PROC_FS 1292 1293 static int pnp_seq_show(struct seq_file *seq, void *v) 1294 { 1295 int i; 1296 1297 if (ic_proto_used & IC_PROTO) 1298 seq_printf(seq, "#PROTO: %s\n", 1299 (ic_proto_used & IC_RARP) ? "RARP" 1300 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1301 else 1302 seq_puts(seq, "#MANUAL\n"); 1303 1304 if (ic_domain[0]) 1305 seq_printf(seq, 1306 "domain %s\n", ic_domain); 1307 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1308 if (ic_nameservers[i] != NONE) 1309 seq_printf(seq, "nameserver %pI4\n", 1310 &ic_nameservers[i]); 1311 } 1312 if (ic_servaddr != NONE) 1313 seq_printf(seq, "bootserver %pI4\n", 1314 &ic_servaddr); 1315 return 0; 1316 } 1317 1318 static int pnp_seq_open(struct inode *indoe, struct file *file) 1319 { 1320 return single_open(file, pnp_seq_show, NULL); 1321 } 1322 1323 static const struct file_operations pnp_seq_fops = { 1324 .owner = THIS_MODULE, 1325 .open = pnp_seq_open, 1326 .read = seq_read, 1327 .llseek = seq_lseek, 1328 .release = single_release, 1329 }; 1330 #endif /* CONFIG_PROC_FS */ 1331 1332 /* 1333 * Extract IP address from the parameter string if needed. Note that we 1334 * need to have root_server_addr set _before_ IPConfig gets called as it 1335 * can override it. 1336 */ 1337 __be32 __init root_nfs_parse_addr(char *name) 1338 { 1339 __be32 addr; 1340 int octets = 0; 1341 char *cp, *cq; 1342 1343 cp = cq = name; 1344 while (octets < 4) { 1345 while (*cp >= '0' && *cp <= '9') 1346 cp++; 1347 if (cp == cq || cp - cq > 3) 1348 break; 1349 if (*cp == '.' || octets == 3) 1350 octets++; 1351 if (octets < 4) 1352 cp++; 1353 cq = cp; 1354 } 1355 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1356 if (*cp == ':') 1357 *cp++ = '\0'; 1358 addr = in_aton(name); 1359 memmove(name, cp, strlen(cp) + 1); 1360 } else 1361 addr = NONE; 1362 1363 return addr; 1364 } 1365 1366 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1367 1368 static int __init wait_for_devices(void) 1369 { 1370 int i; 1371 1372 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1373 struct net_device *dev; 1374 int found = 0; 1375 1376 rtnl_lock(); 1377 for_each_netdev(&init_net, dev) { 1378 if (ic_is_init_dev(dev)) { 1379 found = 1; 1380 break; 1381 } 1382 } 1383 rtnl_unlock(); 1384 if (found) 1385 return 0; 1386 ssleep(1); 1387 } 1388 return -ENODEV; 1389 } 1390 1391 /* 1392 * IP Autoconfig dispatcher. 1393 */ 1394 1395 static int __init ip_auto_config(void) 1396 { 1397 __be32 addr; 1398 #ifdef IPCONFIG_DYNAMIC 1399 int retries = CONF_OPEN_RETRIES; 1400 #endif 1401 int err; 1402 unsigned int i; 1403 1404 #ifdef CONFIG_PROC_FS 1405 proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops); 1406 #endif /* CONFIG_PROC_FS */ 1407 1408 if (!ic_enable) 1409 return 0; 1410 1411 pr_debug("IP-Config: Entered.\n"); 1412 #ifdef IPCONFIG_DYNAMIC 1413 try_try_again: 1414 #endif 1415 /* Wait for devices to appear */ 1416 err = wait_for_devices(); 1417 if (err) 1418 return err; 1419 1420 /* Setup all network devices */ 1421 err = ic_open_devs(); 1422 if (err) 1423 return err; 1424 1425 /* Give drivers a chance to settle */ 1426 msleep(CONF_POST_OPEN); 1427 1428 /* 1429 * If the config information is insufficient (e.g., our IP address or 1430 * IP address of the boot server is missing or we have multiple network 1431 * interfaces and no default was set), use BOOTP or RARP to get the 1432 * missing values. 1433 */ 1434 if (ic_myaddr == NONE || 1435 #ifdef CONFIG_ROOT_NFS 1436 (root_server_addr == NONE && 1437 ic_servaddr == NONE && 1438 ROOT_DEV == Root_NFS) || 1439 #endif 1440 ic_first_dev->next) { 1441 #ifdef IPCONFIG_DYNAMIC 1442 if (ic_dynamic() < 0) { 1443 ic_close_devs(); 1444 1445 /* 1446 * I don't know why, but sometimes the 1447 * eepro100 driver (at least) gets upset and 1448 * doesn't work the first time it's opened. 1449 * But then if you close it and reopen it, it 1450 * works just fine. So we need to try that at 1451 * least once before giving up. 1452 * 1453 * Also, if the root will be NFS-mounted, we 1454 * have nowhere to go if DHCP fails. So we 1455 * just have to keep trying forever. 1456 * 1457 * -- Chip 1458 */ 1459 #ifdef CONFIG_ROOT_NFS 1460 if (ROOT_DEV == Root_NFS) { 1461 pr_err("IP-Config: Retrying forever (NFS root)...\n"); 1462 goto try_try_again; 1463 } 1464 #endif 1465 1466 if (--retries) { 1467 pr_err("IP-Config: Reopening network devices...\n"); 1468 goto try_try_again; 1469 } 1470 1471 /* Oh, well. At least we tried. */ 1472 pr_err("IP-Config: Auto-configuration of network failed\n"); 1473 return -1; 1474 } 1475 #else /* !DYNAMIC */ 1476 pr_err("IP-Config: Incomplete network configuration information\n"); 1477 ic_close_devs(); 1478 return -1; 1479 #endif /* IPCONFIG_DYNAMIC */ 1480 } else { 1481 /* Device selected manually or only one device -> use it */ 1482 ic_dev = ic_first_dev; 1483 } 1484 1485 addr = root_nfs_parse_addr(root_server_path); 1486 if (root_server_addr == NONE) 1487 root_server_addr = addr; 1488 1489 /* 1490 * Use defaults wherever applicable. 1491 */ 1492 if (ic_defaults() < 0) 1493 return -1; 1494 1495 /* 1496 * Record which protocol was actually used. 1497 */ 1498 #ifdef IPCONFIG_DYNAMIC 1499 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1500 #endif 1501 1502 #ifndef IPCONFIG_SILENT 1503 /* 1504 * Clue in the operator. 1505 */ 1506 pr_info("IP-Config: Complete:\n"); 1507 1508 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", 1509 ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr, 1510 &ic_myaddr, &ic_netmask, &ic_gateway); 1511 pr_info(" host=%s, domain=%s, nis-domain=%s\n", 1512 utsname()->nodename, ic_domain, utsname()->domainname); 1513 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", 1514 &ic_servaddr, &root_server_addr, root_server_path); 1515 if (ic_dev_mtu) 1516 pr_cont(", mtu=%d", ic_dev_mtu); 1517 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 1518 if (ic_nameservers[i] != NONE) { 1519 pr_cont(" nameserver%u=%pI4", 1520 i, &ic_nameservers[i]); 1521 break; 1522 } 1523 for (i++; i < CONF_NAMESERVERS_MAX; i++) 1524 if (ic_nameservers[i] != NONE) 1525 pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]); 1526 pr_cont("\n"); 1527 #endif /* !SILENT */ 1528 1529 /* 1530 * Close all network devices except the device we've 1531 * autoconfigured and set up routes. 1532 */ 1533 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1534 err = -1; 1535 else 1536 err = 0; 1537 1538 ic_close_devs(); 1539 1540 return err; 1541 } 1542 1543 late_initcall(ip_auto_config); 1544 1545 1546 /* 1547 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1548 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. 1549 */ 1550 static int __init ic_proto_name(char *name) 1551 { 1552 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1553 return 1; 1554 } 1555 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1556 return 0; 1557 } 1558 #ifdef CONFIG_IP_PNP_DHCP 1559 else if (!strncmp(name, "dhcp", 4)) { 1560 char *client_id; 1561 1562 ic_proto_enabled &= ~IC_RARP; 1563 client_id = strstr(name, "dhcp,"); 1564 if (client_id) { 1565 char *v; 1566 1567 client_id = client_id + 5; 1568 v = strchr(client_id, ','); 1569 if (!v) 1570 return 1; 1571 *v = 0; 1572 if (kstrtou8(client_id, 0, dhcp_client_identifier)) 1573 pr_debug("DHCP: Invalid client identifier type\n"); 1574 strncpy(dhcp_client_identifier + 1, v + 1, 251); 1575 *v = ','; 1576 } 1577 return 1; 1578 } 1579 #endif 1580 #ifdef CONFIG_IP_PNP_BOOTP 1581 else if (!strcmp(name, "bootp")) { 1582 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1583 return 1; 1584 } 1585 #endif 1586 #ifdef CONFIG_IP_PNP_RARP 1587 else if (!strcmp(name, "rarp")) { 1588 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1589 return 1; 1590 } 1591 #endif 1592 #ifdef IPCONFIG_DYNAMIC 1593 else if (!strcmp(name, "both")) { 1594 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1595 return 1; 1596 } 1597 #endif 1598 return 0; 1599 } 1600 1601 static int __init ip_auto_config_setup(char *addrs) 1602 { 1603 char *cp, *ip, *dp; 1604 int num = 0; 1605 1606 ic_set_manually = 1; 1607 ic_enable = 1; 1608 1609 /* 1610 * If any dhcp, bootp etc options are set, leave autoconfig on 1611 * and skip the below static IP processing. 1612 */ 1613 if (ic_proto_name(addrs)) 1614 return 1; 1615 1616 /* If no static IP is given, turn off autoconfig and bail. */ 1617 if (*addrs == 0 || 1618 strcmp(addrs, "off") == 0 || 1619 strcmp(addrs, "none") == 0) { 1620 ic_enable = 0; 1621 return 1; 1622 } 1623 1624 ic_nameservers_predef(); 1625 1626 /* Parse string for static IP assignment. */ 1627 ip = addrs; 1628 while (ip && *ip) { 1629 if ((cp = strchr(ip, ':'))) 1630 *cp++ = '\0'; 1631 if (strlen(ip) > 0) { 1632 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip); 1633 switch (num) { 1634 case 0: 1635 if ((ic_myaddr = in_aton(ip)) == ANY) 1636 ic_myaddr = NONE; 1637 break; 1638 case 1: 1639 if ((ic_servaddr = in_aton(ip)) == ANY) 1640 ic_servaddr = NONE; 1641 break; 1642 case 2: 1643 if ((ic_gateway = in_aton(ip)) == ANY) 1644 ic_gateway = NONE; 1645 break; 1646 case 3: 1647 if ((ic_netmask = in_aton(ip)) == ANY) 1648 ic_netmask = NONE; 1649 break; 1650 case 4: 1651 if ((dp = strchr(ip, '.'))) { 1652 *dp++ = '\0'; 1653 strlcpy(utsname()->domainname, dp, 1654 sizeof(utsname()->domainname)); 1655 } 1656 strlcpy(utsname()->nodename, ip, 1657 sizeof(utsname()->nodename)); 1658 ic_host_name_set = 1; 1659 break; 1660 case 5: 1661 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1662 break; 1663 case 6: 1664 if (ic_proto_name(ip) == 0 && 1665 ic_myaddr == NONE) { 1666 ic_enable = 0; 1667 } 1668 break; 1669 case 7: 1670 if (CONF_NAMESERVERS_MAX >= 1) { 1671 ic_nameservers[0] = in_aton(ip); 1672 if (ic_nameservers[0] == ANY) 1673 ic_nameservers[0] = NONE; 1674 } 1675 break; 1676 case 8: 1677 if (CONF_NAMESERVERS_MAX >= 2) { 1678 ic_nameservers[1] = in_aton(ip); 1679 if (ic_nameservers[1] == ANY) 1680 ic_nameservers[1] = NONE; 1681 } 1682 break; 1683 } 1684 } 1685 ip = cp; 1686 num++; 1687 } 1688 1689 return 1; 1690 } 1691 __setup("ip=", ip_auto_config_setup); 1692 1693 static int __init nfsaddrs_config_setup(char *addrs) 1694 { 1695 return ip_auto_config_setup(addrs); 1696 } 1697 __setup("nfsaddrs=", nfsaddrs_config_setup); 1698 1699 static int __init vendor_class_identifier_setup(char *addrs) 1700 { 1701 if (strlcpy(vendor_class_identifier, addrs, 1702 sizeof(vendor_class_identifier)) 1703 >= sizeof(vendor_class_identifier)) 1704 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n", 1705 vendor_class_identifier); 1706 return 1; 1707 } 1708 __setup("dhcpclass=", vendor_class_identifier_setup); 1709