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