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