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