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) /* Inter-device timeout: 1 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 and DSA master network devices up first */ 213 for_each_netdev(&init_net, dev) { 214 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev)) 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 && !netdev_uses_dsa(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 skb = skb_share_check(skb, GFP_ATOMIC); 508 if (!skb) 509 return NET_RX_DROP; 510 511 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 512 goto drop; 513 514 /* Basic sanity checks can be done without the lock. */ 515 rarp = (struct arphdr *)skb_transport_header(skb); 516 517 /* If this test doesn't pass, it's not IP, or we should 518 * ignore it anyway. 519 */ 520 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 521 goto drop; 522 523 /* If it's not a RARP reply, delete it. */ 524 if (rarp->ar_op != htons(ARPOP_RREPLY)) 525 goto drop; 526 527 /* If it's not Ethernet, delete it. */ 528 if (rarp->ar_pro != htons(ETH_P_IP)) 529 goto drop; 530 531 if (!pskb_may_pull(skb, arp_hdr_len(dev))) 532 goto drop; 533 534 /* OK, it is all there and looks valid, process... */ 535 rarp = (struct arphdr *)skb_transport_header(skb); 536 rarp_ptr = (unsigned char *) (rarp + 1); 537 538 /* One reply at a time, please. */ 539 spin_lock(&ic_recv_lock); 540 541 /* If we already have a reply, just drop the packet */ 542 if (ic_got_reply) 543 goto drop_unlock; 544 545 /* Find the ic_device that the packet arrived on */ 546 d = ic_first_dev; 547 while (d && d->dev != dev) 548 d = d->next; 549 if (!d) 550 goto drop_unlock; /* should never happen */ 551 552 /* Extract variable-width fields */ 553 rarp_ptr += dev->addr_len; 554 memcpy(&sip, rarp_ptr, 4); 555 rarp_ptr += 4; 556 tha = rarp_ptr; 557 rarp_ptr += dev->addr_len; 558 memcpy(&tip, rarp_ptr, 4); 559 560 /* Discard packets which are not meant for us. */ 561 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 562 goto drop_unlock; 563 564 /* Discard packets which are not from specified server. */ 565 if (ic_servaddr != NONE && ic_servaddr != sip) 566 goto drop_unlock; 567 568 /* We have a winner! */ 569 ic_dev = dev; 570 if (ic_myaddr == NONE) 571 ic_myaddr = tip; 572 ic_servaddr = sip; 573 ic_addrservaddr = sip; 574 ic_got_reply = IC_RARP; 575 576 drop_unlock: 577 /* Show's over. Nothing to see here. */ 578 spin_unlock(&ic_recv_lock); 579 580 drop: 581 /* Throw the packet out. */ 582 kfree_skb(skb); 583 return 0; 584 } 585 586 587 /* 588 * Send RARP request packet over a single interface. 589 */ 590 static void __init ic_rarp_send_if(struct ic_device *d) 591 { 592 struct net_device *dev = d->dev; 593 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 594 dev->dev_addr, dev->dev_addr); 595 } 596 #endif 597 598 /* 599 * Predefine Nameservers 600 */ 601 static inline void __init ic_nameservers_predef(void) 602 { 603 int i; 604 605 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 606 ic_nameservers[i] = NONE; 607 } 608 609 /* 610 * DHCP/BOOTP support. 611 */ 612 613 #ifdef IPCONFIG_BOOTP 614 615 struct bootp_pkt { /* BOOTP packet format */ 616 struct iphdr iph; /* IP header */ 617 struct udphdr udph; /* UDP header */ 618 u8 op; /* 1=request, 2=reply */ 619 u8 htype; /* HW address type */ 620 u8 hlen; /* HW address length */ 621 u8 hops; /* Used only by gateways */ 622 __be32 xid; /* Transaction ID */ 623 __be16 secs; /* Seconds since we started */ 624 __be16 flags; /* Just what it says */ 625 __be32 client_ip; /* Client's IP address if known */ 626 __be32 your_ip; /* Assigned IP address */ 627 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 628 __be32 relay_ip; /* IP address of BOOTP relay */ 629 u8 hw_addr[16]; /* Client's HW address */ 630 u8 serv_name[64]; /* Server host name */ 631 u8 boot_file[128]; /* Name of boot file */ 632 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 633 }; 634 635 /* packet ops */ 636 #define BOOTP_REQUEST 1 637 #define BOOTP_REPLY 2 638 639 /* DHCP message types */ 640 #define DHCPDISCOVER 1 641 #define DHCPOFFER 2 642 #define DHCPREQUEST 3 643 #define DHCPDECLINE 4 644 #define DHCPACK 5 645 #define DHCPNAK 6 646 #define DHCPRELEASE 7 647 #define DHCPINFORM 8 648 649 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 650 651 static struct packet_type bootp_packet_type __initdata = { 652 .type = cpu_to_be16(ETH_P_IP), 653 .func = ic_bootp_recv, 654 }; 655 656 static __be32 ic_dev_xid; /* Device under configuration */ 657 658 /* 659 * Initialize DHCP/BOOTP extension fields in the request. 660 */ 661 662 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 663 664 #ifdef IPCONFIG_DHCP 665 666 static void __init 667 ic_dhcp_init_options(u8 *options) 668 { 669 u8 mt = ((ic_servaddr == NONE) 670 ? DHCPDISCOVER : DHCPREQUEST); 671 u8 *e = options; 672 int len; 673 674 #ifdef IPCONFIG_DEBUG 675 printk("DHCP: Sending message type %d\n", mt); 676 #endif 677 678 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 679 e += 4; 680 681 *e++ = 53; /* DHCP message type */ 682 *e++ = 1; 683 *e++ = mt; 684 685 if (mt == DHCPREQUEST) { 686 *e++ = 54; /* Server ID (IP address) */ 687 *e++ = 4; 688 memcpy(e, &ic_servaddr, 4); 689 e += 4; 690 691 *e++ = 50; /* Requested IP address */ 692 *e++ = 4; 693 memcpy(e, &ic_myaddr, 4); 694 e += 4; 695 } 696 697 /* always? */ 698 { 699 static const u8 ic_req_params[] = { 700 1, /* Subnet mask */ 701 3, /* Default gateway */ 702 6, /* DNS server */ 703 12, /* Host name */ 704 15, /* Domain name */ 705 17, /* Boot path */ 706 26, /* MTU */ 707 40, /* NIS domain name */ 708 }; 709 710 *e++ = 55; /* Parameter request list */ 711 *e++ = sizeof(ic_req_params); 712 memcpy(e, ic_req_params, sizeof(ic_req_params)); 713 e += sizeof(ic_req_params); 714 715 if (ic_host_name_set) { 716 *e++ = 12; /* host-name */ 717 len = strlen(utsname()->nodename); 718 *e++ = len; 719 memcpy(e, utsname()->nodename, len); 720 e += len; 721 } 722 if (*vendor_class_identifier) { 723 pr_info("DHCP: sending class identifier \"%s\"\n", 724 vendor_class_identifier); 725 *e++ = 60; /* Class-identifier */ 726 len = strlen(vendor_class_identifier); 727 *e++ = len; 728 memcpy(e, vendor_class_identifier, len); 729 e += len; 730 } 731 } 732 733 *e++ = 255; /* End of the list */ 734 } 735 736 #endif /* IPCONFIG_DHCP */ 737 738 static void __init ic_bootp_init_ext(u8 *e) 739 { 740 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 741 e += 4; 742 *e++ = 1; /* Subnet mask request */ 743 *e++ = 4; 744 e += 4; 745 *e++ = 3; /* Default gateway request */ 746 *e++ = 4; 747 e += 4; 748 *e++ = 5; /* Name server request */ 749 *e++ = 8; 750 e += 8; 751 *e++ = 12; /* Host name request */ 752 *e++ = 32; 753 e += 32; 754 *e++ = 40; /* NIS Domain name request */ 755 *e++ = 32; 756 e += 32; 757 *e++ = 17; /* Boot path */ 758 *e++ = 40; 759 e += 40; 760 761 *e++ = 57; /* set extension buffer size for reply */ 762 *e++ = 2; 763 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 764 *e++ = 150; 765 766 *e++ = 255; /* End of the list */ 767 } 768 769 770 /* 771 * Initialize the DHCP/BOOTP mechanism. 772 */ 773 static inline void __init ic_bootp_init(void) 774 { 775 ic_nameservers_predef(); 776 777 dev_add_pack(&bootp_packet_type); 778 } 779 780 781 /* 782 * DHCP/BOOTP cleanup. 783 */ 784 static inline void __init ic_bootp_cleanup(void) 785 { 786 dev_remove_pack(&bootp_packet_type); 787 } 788 789 790 /* 791 * Send DHCP/BOOTP request to single interface. 792 */ 793 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 794 { 795 struct net_device *dev = d->dev; 796 struct sk_buff *skb; 797 struct bootp_pkt *b; 798 struct iphdr *h; 799 int hlen = LL_RESERVED_SPACE(dev); 800 int tlen = dev->needed_tailroom; 801 802 /* Allocate packet */ 803 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, 804 GFP_KERNEL); 805 if (!skb) 806 return; 807 skb_reserve(skb, hlen); 808 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 809 memset(b, 0, sizeof(struct bootp_pkt)); 810 811 /* Construct IP header */ 812 skb_reset_network_header(skb); 813 h = ip_hdr(skb); 814 h->version = 4; 815 h->ihl = 5; 816 h->tot_len = htons(sizeof(struct bootp_pkt)); 817 h->frag_off = htons(IP_DF); 818 h->ttl = 64; 819 h->protocol = IPPROTO_UDP; 820 h->daddr = htonl(INADDR_BROADCAST); 821 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 822 823 /* Construct UDP header */ 824 b->udph.source = htons(68); 825 b->udph.dest = htons(67); 826 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 827 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 828 829 /* Construct DHCP/BOOTP header */ 830 b->op = BOOTP_REQUEST; 831 if (dev->type < 256) /* check for false types */ 832 b->htype = dev->type; 833 else if (dev->type == ARPHRD_FDDI) 834 b->htype = ARPHRD_ETHER; 835 else { 836 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 837 b->htype = dev->type; /* can cause undefined behavior */ 838 } 839 840 /* server_ip and your_ip address are both already zero per RFC2131 */ 841 b->hlen = dev->addr_len; 842 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 843 b->secs = htons(jiffies_diff / HZ); 844 b->xid = d->xid; 845 846 /* add DHCP options or BOOTP extensions */ 847 #ifdef IPCONFIG_DHCP 848 if (ic_proto_enabled & IC_USE_DHCP) 849 ic_dhcp_init_options(b->exten); 850 else 851 #endif 852 ic_bootp_init_ext(b->exten); 853 854 /* Chain packet down the line... */ 855 skb->dev = dev; 856 skb->protocol = htons(ETH_P_IP); 857 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 858 dev->broadcast, dev->dev_addr, skb->len) < 0) { 859 kfree_skb(skb); 860 printk("E"); 861 return; 862 } 863 864 if (dev_queue_xmit(skb) < 0) 865 printk("E"); 866 } 867 868 869 /* 870 * Copy BOOTP-supplied string if not already set. 871 */ 872 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 873 { 874 if (!len) 875 return 0; 876 if (len > max-1) 877 len = max-1; 878 memcpy(dest, src, len); 879 dest[len] = '\0'; 880 return 1; 881 } 882 883 884 /* 885 * Process BOOTP extensions. 886 */ 887 static void __init ic_do_bootp_ext(u8 *ext) 888 { 889 u8 servers; 890 int i; 891 __be16 mtu; 892 893 #ifdef IPCONFIG_DEBUG 894 u8 *c; 895 896 printk("DHCP/BOOTP: Got extension %d:",*ext); 897 for (c=ext+2; c<ext+2+ext[1]; c++) 898 printk(" %02x", *c); 899 printk("\n"); 900 #endif 901 902 switch (*ext++) { 903 case 1: /* Subnet mask */ 904 if (ic_netmask == NONE) 905 memcpy(&ic_netmask, ext+1, 4); 906 break; 907 case 3: /* Default gateway */ 908 if (ic_gateway == NONE) 909 memcpy(&ic_gateway, ext+1, 4); 910 break; 911 case 6: /* DNS server */ 912 servers= *ext/4; 913 if (servers > CONF_NAMESERVERS_MAX) 914 servers = CONF_NAMESERVERS_MAX; 915 for (i = 0; i < servers; i++) { 916 if (ic_nameservers[i] == NONE) 917 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 918 } 919 break; 920 case 12: /* Host name */ 921 ic_bootp_string(utsname()->nodename, ext+1, *ext, 922 __NEW_UTS_LEN); 923 ic_host_name_set = 1; 924 break; 925 case 15: /* Domain name (DNS) */ 926 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 927 break; 928 case 17: /* Root path */ 929 if (!root_server_path[0]) 930 ic_bootp_string(root_server_path, ext+1, *ext, 931 sizeof(root_server_path)); 932 break; 933 case 26: /* Interface MTU */ 934 memcpy(&mtu, ext+1, sizeof(mtu)); 935 ic_dev_mtu = ntohs(mtu); 936 break; 937 case 40: /* NIS Domain name (_not_ DNS) */ 938 ic_bootp_string(utsname()->domainname, ext+1, *ext, 939 __NEW_UTS_LEN); 940 break; 941 } 942 } 943 944 945 /* 946 * Receive BOOTP reply. 947 */ 948 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 949 { 950 struct bootp_pkt *b; 951 struct iphdr *h; 952 struct ic_device *d; 953 int len, ext_len; 954 955 if (!net_eq(dev_net(dev), &init_net)) 956 goto drop; 957 958 /* Perform verifications before taking the lock. */ 959 if (skb->pkt_type == PACKET_OTHERHOST) 960 goto drop; 961 962 skb = skb_share_check(skb, GFP_ATOMIC); 963 if (!skb) 964 return NET_RX_DROP; 965 966 if (!pskb_may_pull(skb, 967 sizeof(struct iphdr) + 968 sizeof(struct udphdr))) 969 goto drop; 970 971 b = (struct bootp_pkt *)skb_network_header(skb); 972 h = &b->iph; 973 974 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 975 goto drop; 976 977 /* Fragments are not supported */ 978 if (ip_is_fragment(h)) { 979 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); 980 goto drop; 981 } 982 983 if (skb->len < ntohs(h->tot_len)) 984 goto drop; 985 986 if (ip_fast_csum((char *) h, h->ihl)) 987 goto drop; 988 989 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 990 goto drop; 991 992 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 993 goto drop; 994 995 len = ntohs(b->udph.len) - sizeof(struct udphdr); 996 ext_len = len - (sizeof(*b) - 997 sizeof(struct iphdr) - 998 sizeof(struct udphdr) - 999 sizeof(b->exten)); 1000 if (ext_len < 0) 1001 goto drop; 1002 1003 /* Ok the front looks good, make sure we can get at the rest. */ 1004 if (!pskb_may_pull(skb, skb->len)) 1005 goto drop; 1006 1007 b = (struct bootp_pkt *)skb_network_header(skb); 1008 h = &b->iph; 1009 1010 /* One reply at a time, please. */ 1011 spin_lock(&ic_recv_lock); 1012 1013 /* If we already have a reply, just drop the packet */ 1014 if (ic_got_reply) 1015 goto drop_unlock; 1016 1017 /* Find the ic_device that the packet arrived on */ 1018 d = ic_first_dev; 1019 while (d && d->dev != dev) 1020 d = d->next; 1021 if (!d) 1022 goto drop_unlock; /* should never happen */ 1023 1024 /* Is it a reply to our BOOTP request? */ 1025 if (b->op != BOOTP_REPLY || 1026 b->xid != d->xid) { 1027 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n", 1028 b->op, b->xid); 1029 goto drop_unlock; 1030 } 1031 1032 /* Is it a reply for the device we are configuring? */ 1033 if (b->xid != ic_dev_xid) { 1034 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n"); 1035 goto drop_unlock; 1036 } 1037 1038 /* Parse extensions */ 1039 if (ext_len >= 4 && 1040 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1041 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1042 u8 *ext; 1043 1044 #ifdef IPCONFIG_DHCP 1045 if (ic_proto_enabled & IC_USE_DHCP) { 1046 __be32 server_id = NONE; 1047 int mt = 0; 1048 1049 ext = &b->exten[4]; 1050 while (ext < end && *ext != 0xff) { 1051 u8 *opt = ext++; 1052 if (*opt == 0) /* Padding */ 1053 continue; 1054 ext += *ext + 1; 1055 if (ext >= end) 1056 break; 1057 switch (*opt) { 1058 case 53: /* Message type */ 1059 if (opt[1]) 1060 mt = opt[2]; 1061 break; 1062 case 54: /* Server ID (IP address) */ 1063 if (opt[1] >= 4) 1064 memcpy(&server_id, opt + 2, 4); 1065 break; 1066 } 1067 } 1068 1069 #ifdef IPCONFIG_DEBUG 1070 printk("DHCP: Got message type %d\n", mt); 1071 #endif 1072 1073 switch (mt) { 1074 case DHCPOFFER: 1075 /* While in the process of accepting one offer, 1076 * ignore all others. 1077 */ 1078 if (ic_myaddr != NONE) 1079 goto drop_unlock; 1080 1081 /* Let's accept that offer. */ 1082 ic_myaddr = b->your_ip; 1083 ic_servaddr = server_id; 1084 #ifdef IPCONFIG_DEBUG 1085 printk("DHCP: Offered address %pI4 by server %pI4\n", 1086 &ic_myaddr, &b->iph.saddr); 1087 #endif 1088 /* The DHCP indicated server address takes 1089 * precedence over the bootp header one if 1090 * they are different. 1091 */ 1092 if ((server_id != NONE) && 1093 (b->server_ip != server_id)) 1094 b->server_ip = ic_servaddr; 1095 break; 1096 1097 case DHCPACK: 1098 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1099 goto drop_unlock; 1100 1101 /* Yeah! */ 1102 break; 1103 1104 default: 1105 /* Urque. Forget it*/ 1106 ic_myaddr = NONE; 1107 ic_servaddr = NONE; 1108 goto drop_unlock; 1109 } 1110 1111 ic_dhcp_msgtype = mt; 1112 1113 } 1114 #endif /* IPCONFIG_DHCP */ 1115 1116 ext = &b->exten[4]; 1117 while (ext < end && *ext != 0xff) { 1118 u8 *opt = ext++; 1119 if (*opt == 0) /* Padding */ 1120 continue; 1121 ext += *ext + 1; 1122 if (ext < end) 1123 ic_do_bootp_ext(opt); 1124 } 1125 } 1126 1127 /* We have a winner! */ 1128 ic_dev = dev; 1129 ic_myaddr = b->your_ip; 1130 ic_servaddr = b->server_ip; 1131 ic_addrservaddr = b->iph.saddr; 1132 if (ic_gateway == NONE && b->relay_ip) 1133 ic_gateway = b->relay_ip; 1134 if (ic_nameservers[0] == NONE) 1135 ic_nameservers[0] = ic_servaddr; 1136 ic_got_reply = IC_BOOTP; 1137 1138 drop_unlock: 1139 /* Show's over. Nothing to see here. */ 1140 spin_unlock(&ic_recv_lock); 1141 1142 drop: 1143 /* Throw the packet out. */ 1144 kfree_skb(skb); 1145 1146 return 0; 1147 } 1148 1149 1150 #endif 1151 1152 1153 /* 1154 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1155 */ 1156 1157 #ifdef IPCONFIG_DYNAMIC 1158 1159 static int __init ic_dynamic(void) 1160 { 1161 int retries; 1162 struct ic_device *d; 1163 unsigned long start_jiffies, timeout, jiff; 1164 int do_bootp = ic_proto_have_if & IC_BOOTP; 1165 int do_rarp = ic_proto_have_if & IC_RARP; 1166 1167 /* 1168 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1169 * This routine gets only called when some pieces of information 1170 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1171 */ 1172 if (!ic_proto_enabled) { 1173 pr_err("IP-Config: Incomplete network configuration information\n"); 1174 return -1; 1175 } 1176 1177 #ifdef IPCONFIG_BOOTP 1178 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1179 pr_err("DHCP/BOOTP: No suitable device found\n"); 1180 #endif 1181 #ifdef IPCONFIG_RARP 1182 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1183 pr_err("RARP: No suitable device found\n"); 1184 #endif 1185 1186 if (!ic_proto_have_if) 1187 /* Error message already printed */ 1188 return -1; 1189 1190 /* 1191 * Setup protocols 1192 */ 1193 #ifdef IPCONFIG_BOOTP 1194 if (do_bootp) 1195 ic_bootp_init(); 1196 #endif 1197 #ifdef IPCONFIG_RARP 1198 if (do_rarp) 1199 ic_rarp_init(); 1200 #endif 1201 1202 /* 1203 * Send requests and wait, until we get an answer. This loop 1204 * seems to be a terrible waste of CPU time, but actually there is 1205 * only one process running at all, so we don't need to use any 1206 * scheduler functions. 1207 * [Actually we could now, but the nothing else running note still 1208 * applies.. - AC] 1209 */ 1210 pr_notice("Sending %s%s%s requests .", 1211 do_bootp 1212 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1213 (do_bootp && do_rarp) ? " and " : "", 1214 do_rarp ? "RARP" : ""); 1215 1216 start_jiffies = jiffies; 1217 d = ic_first_dev; 1218 retries = CONF_SEND_RETRIES; 1219 get_random_bytes(&timeout, sizeof(timeout)); 1220 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); 1221 for (;;) { 1222 #ifdef IPCONFIG_BOOTP 1223 /* Track the device we are configuring */ 1224 ic_dev_xid = d->xid; 1225 1226 if (do_bootp && (d->able & IC_BOOTP)) 1227 ic_bootp_send_if(d, jiffies - start_jiffies); 1228 #endif 1229 #ifdef IPCONFIG_RARP 1230 if (do_rarp && (d->able & IC_RARP)) 1231 ic_rarp_send_if(d); 1232 #endif 1233 1234 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1235 while (time_before(jiffies, jiff) && !ic_got_reply) 1236 schedule_timeout_uninterruptible(1); 1237 #ifdef IPCONFIG_DHCP 1238 /* DHCP isn't done until we get a DHCPACK. */ 1239 if ((ic_got_reply & IC_BOOTP) && 1240 (ic_proto_enabled & IC_USE_DHCP) && 1241 ic_dhcp_msgtype != DHCPACK) { 1242 ic_got_reply = 0; 1243 pr_cont(","); 1244 continue; 1245 } 1246 #endif /* IPCONFIG_DHCP */ 1247 1248 if (ic_got_reply) { 1249 pr_cont(" OK\n"); 1250 break; 1251 } 1252 1253 if ((d = d->next)) 1254 continue; 1255 1256 if (! --retries) { 1257 pr_cont(" timed out!\n"); 1258 break; 1259 } 1260 1261 d = ic_first_dev; 1262 1263 timeout = timeout CONF_TIMEOUT_MULT; 1264 if (timeout > CONF_TIMEOUT_MAX) 1265 timeout = CONF_TIMEOUT_MAX; 1266 1267 pr_cont("."); 1268 } 1269 1270 #ifdef IPCONFIG_BOOTP 1271 if (do_bootp) 1272 ic_bootp_cleanup(); 1273 #endif 1274 #ifdef IPCONFIG_RARP 1275 if (do_rarp) 1276 ic_rarp_cleanup(); 1277 #endif 1278 1279 if (!ic_got_reply) { 1280 ic_myaddr = NONE; 1281 return -1; 1282 } 1283 1284 printk("IP-Config: Got %s answer from %pI4, ", 1285 ((ic_got_reply & IC_RARP) ? "RARP" 1286 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1287 &ic_addrservaddr); 1288 pr_cont("my address is %pI4\n", &ic_myaddr); 1289 1290 return 0; 1291 } 1292 1293 #endif /* IPCONFIG_DYNAMIC */ 1294 1295 #ifdef CONFIG_PROC_FS 1296 1297 static int pnp_seq_show(struct seq_file *seq, void *v) 1298 { 1299 int i; 1300 1301 if (ic_proto_used & IC_PROTO) 1302 seq_printf(seq, "#PROTO: %s\n", 1303 (ic_proto_used & IC_RARP) ? "RARP" 1304 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1305 else 1306 seq_puts(seq, "#MANUAL\n"); 1307 1308 if (ic_domain[0]) 1309 seq_printf(seq, 1310 "domain %s\n", ic_domain); 1311 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1312 if (ic_nameservers[i] != NONE) 1313 seq_printf(seq, "nameserver %pI4\n", 1314 &ic_nameservers[i]); 1315 } 1316 if (ic_servaddr != NONE) 1317 seq_printf(seq, "bootserver %pI4\n", 1318 &ic_servaddr); 1319 return 0; 1320 } 1321 1322 static int pnp_seq_open(struct inode *indoe, struct file *file) 1323 { 1324 return single_open(file, pnp_seq_show, NULL); 1325 } 1326 1327 static const struct file_operations pnp_seq_fops = { 1328 .owner = THIS_MODULE, 1329 .open = pnp_seq_open, 1330 .read = seq_read, 1331 .llseek = seq_lseek, 1332 .release = single_release, 1333 }; 1334 #endif /* CONFIG_PROC_FS */ 1335 1336 /* 1337 * Extract IP address from the parameter string if needed. Note that we 1338 * need to have root_server_addr set _before_ IPConfig gets called as it 1339 * can override it. 1340 */ 1341 __be32 __init root_nfs_parse_addr(char *name) 1342 { 1343 __be32 addr; 1344 int octets = 0; 1345 char *cp, *cq; 1346 1347 cp = cq = name; 1348 while (octets < 4) { 1349 while (*cp >= '0' && *cp <= '9') 1350 cp++; 1351 if (cp == cq || cp - cq > 3) 1352 break; 1353 if (*cp == '.' || octets == 3) 1354 octets++; 1355 if (octets < 4) 1356 cp++; 1357 cq = cp; 1358 } 1359 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1360 if (*cp == ':') 1361 *cp++ = '\0'; 1362 addr = in_aton(name); 1363 memmove(name, cp, strlen(cp) + 1); 1364 } else 1365 addr = NONE; 1366 1367 return addr; 1368 } 1369 1370 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1371 1372 static int __init wait_for_devices(void) 1373 { 1374 int i; 1375 1376 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1377 struct net_device *dev; 1378 int found = 0; 1379 1380 rtnl_lock(); 1381 for_each_netdev(&init_net, dev) { 1382 if (ic_is_init_dev(dev)) { 1383 found = 1; 1384 break; 1385 } 1386 } 1387 rtnl_unlock(); 1388 if (found) 1389 return 0; 1390 ssleep(1); 1391 } 1392 return -ENODEV; 1393 } 1394 1395 /* 1396 * IP Autoconfig dispatcher. 1397 */ 1398 1399 static int __init ip_auto_config(void) 1400 { 1401 __be32 addr; 1402 #ifdef IPCONFIG_DYNAMIC 1403 int retries = CONF_OPEN_RETRIES; 1404 #endif 1405 int err; 1406 unsigned int i; 1407 1408 #ifdef CONFIG_PROC_FS 1409 proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops); 1410 #endif /* CONFIG_PROC_FS */ 1411 1412 if (!ic_enable) 1413 return 0; 1414 1415 DBG(("IP-Config: Entered.\n")); 1416 #ifdef IPCONFIG_DYNAMIC 1417 try_try_again: 1418 #endif 1419 /* Wait for devices to appear */ 1420 err = wait_for_devices(); 1421 if (err) 1422 return err; 1423 1424 /* Setup all network devices */ 1425 err = ic_open_devs(); 1426 if (err) 1427 return err; 1428 1429 /* Give drivers a chance to settle */ 1430 msleep(CONF_POST_OPEN); 1431 1432 /* 1433 * If the config information is insufficient (e.g., our IP address or 1434 * IP address of the boot server is missing or we have multiple network 1435 * interfaces and no default was set), use BOOTP or RARP to get the 1436 * missing values. 1437 */ 1438 if (ic_myaddr == NONE || 1439 #ifdef CONFIG_ROOT_NFS 1440 (root_server_addr == NONE && 1441 ic_servaddr == NONE && 1442 ROOT_DEV == Root_NFS) || 1443 #endif 1444 ic_first_dev->next) { 1445 #ifdef IPCONFIG_DYNAMIC 1446 if (ic_dynamic() < 0) { 1447 ic_close_devs(); 1448 1449 /* 1450 * I don't know why, but sometimes the 1451 * eepro100 driver (at least) gets upset and 1452 * doesn't work the first time it's opened. 1453 * But then if you close it and reopen it, it 1454 * works just fine. So we need to try that at 1455 * least once before giving up. 1456 * 1457 * Also, if the root will be NFS-mounted, we 1458 * have nowhere to go if DHCP fails. So we 1459 * just have to keep trying forever. 1460 * 1461 * -- Chip 1462 */ 1463 #ifdef CONFIG_ROOT_NFS 1464 if (ROOT_DEV == Root_NFS) { 1465 pr_err("IP-Config: Retrying forever (NFS root)...\n"); 1466 goto try_try_again; 1467 } 1468 #endif 1469 1470 if (--retries) { 1471 pr_err("IP-Config: Reopening network devices...\n"); 1472 goto try_try_again; 1473 } 1474 1475 /* Oh, well. At least we tried. */ 1476 pr_err("IP-Config: Auto-configuration of network failed\n"); 1477 return -1; 1478 } 1479 #else /* !DYNAMIC */ 1480 pr_err("IP-Config: Incomplete network configuration information\n"); 1481 ic_close_devs(); 1482 return -1; 1483 #endif /* IPCONFIG_DYNAMIC */ 1484 } else { 1485 /* Device selected manually or only one device -> use it */ 1486 ic_dev = ic_first_dev->dev; 1487 } 1488 1489 addr = root_nfs_parse_addr(root_server_path); 1490 if (root_server_addr == NONE) 1491 root_server_addr = addr; 1492 1493 /* 1494 * Use defaults wherever applicable. 1495 */ 1496 if (ic_defaults() < 0) 1497 return -1; 1498 1499 /* 1500 * Close all network devices except the device we've 1501 * autoconfigured and set up routes. 1502 */ 1503 ic_close_devs(); 1504 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1505 return -1; 1506 1507 /* 1508 * Record which protocol was actually used. 1509 */ 1510 #ifdef IPCONFIG_DYNAMIC 1511 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1512 #endif 1513 1514 #ifndef IPCONFIG_SILENT 1515 /* 1516 * Clue in the operator. 1517 */ 1518 pr_info("IP-Config: Complete:\n"); 1519 1520 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", 1521 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr, 1522 &ic_myaddr, &ic_netmask, &ic_gateway); 1523 pr_info(" host=%s, domain=%s, nis-domain=%s\n", 1524 utsname()->nodename, ic_domain, utsname()->domainname); 1525 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", 1526 &ic_servaddr, &root_server_addr, root_server_path); 1527 if (ic_dev_mtu) 1528 pr_cont(", mtu=%d", ic_dev_mtu); 1529 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 1530 if (ic_nameservers[i] != NONE) { 1531 pr_info(" nameserver%u=%pI4", 1532 i, &ic_nameservers[i]); 1533 break; 1534 } 1535 for (i++; i < CONF_NAMESERVERS_MAX; i++) 1536 if (ic_nameservers[i] != NONE) 1537 pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]); 1538 pr_cont("\n"); 1539 #endif /* !SILENT */ 1540 1541 return 0; 1542 } 1543 1544 late_initcall(ip_auto_config); 1545 1546 1547 /* 1548 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1549 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. 1550 */ 1551 static int __init ic_proto_name(char *name) 1552 { 1553 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1554 return 1; 1555 } 1556 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1557 return 0; 1558 } 1559 #ifdef CONFIG_IP_PNP_DHCP 1560 else if (!strcmp(name, "dhcp")) { 1561 ic_proto_enabled &= ~IC_RARP; 1562 return 1; 1563 } 1564 #endif 1565 #ifdef CONFIG_IP_PNP_BOOTP 1566 else if (!strcmp(name, "bootp")) { 1567 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1568 return 1; 1569 } 1570 #endif 1571 #ifdef CONFIG_IP_PNP_RARP 1572 else if (!strcmp(name, "rarp")) { 1573 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1574 return 1; 1575 } 1576 #endif 1577 #ifdef IPCONFIG_DYNAMIC 1578 else if (!strcmp(name, "both")) { 1579 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1580 return 1; 1581 } 1582 #endif 1583 return 0; 1584 } 1585 1586 static int __init ip_auto_config_setup(char *addrs) 1587 { 1588 char *cp, *ip, *dp; 1589 int num = 0; 1590 1591 ic_set_manually = 1; 1592 ic_enable = 1; 1593 1594 /* 1595 * If any dhcp, bootp etc options are set, leave autoconfig on 1596 * and skip the below static IP processing. 1597 */ 1598 if (ic_proto_name(addrs)) 1599 return 1; 1600 1601 /* If no static IP is given, turn off autoconfig and bail. */ 1602 if (*addrs == 0 || 1603 strcmp(addrs, "off") == 0 || 1604 strcmp(addrs, "none") == 0) { 1605 ic_enable = 0; 1606 return 1; 1607 } 1608 1609 ic_nameservers_predef(); 1610 1611 /* Parse string for static IP assignment. */ 1612 ip = addrs; 1613 while (ip && *ip) { 1614 if ((cp = strchr(ip, ':'))) 1615 *cp++ = '\0'; 1616 if (strlen(ip) > 0) { 1617 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); 1618 switch (num) { 1619 case 0: 1620 if ((ic_myaddr = in_aton(ip)) == ANY) 1621 ic_myaddr = NONE; 1622 break; 1623 case 1: 1624 if ((ic_servaddr = in_aton(ip)) == ANY) 1625 ic_servaddr = NONE; 1626 break; 1627 case 2: 1628 if ((ic_gateway = in_aton(ip)) == ANY) 1629 ic_gateway = NONE; 1630 break; 1631 case 3: 1632 if ((ic_netmask = in_aton(ip)) == ANY) 1633 ic_netmask = NONE; 1634 break; 1635 case 4: 1636 if ((dp = strchr(ip, '.'))) { 1637 *dp++ = '\0'; 1638 strlcpy(utsname()->domainname, dp, 1639 sizeof(utsname()->domainname)); 1640 } 1641 strlcpy(utsname()->nodename, ip, 1642 sizeof(utsname()->nodename)); 1643 ic_host_name_set = 1; 1644 break; 1645 case 5: 1646 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1647 break; 1648 case 6: 1649 if (ic_proto_name(ip) == 0 && 1650 ic_myaddr == NONE) { 1651 ic_enable = 0; 1652 } 1653 break; 1654 case 7: 1655 if (CONF_NAMESERVERS_MAX >= 1) { 1656 ic_nameservers[0] = in_aton(ip); 1657 if (ic_nameservers[0] == ANY) 1658 ic_nameservers[0] = NONE; 1659 } 1660 break; 1661 case 8: 1662 if (CONF_NAMESERVERS_MAX >= 2) { 1663 ic_nameservers[1] = in_aton(ip); 1664 if (ic_nameservers[1] == ANY) 1665 ic_nameservers[1] = NONE; 1666 } 1667 break; 1668 } 1669 } 1670 ip = cp; 1671 num++; 1672 } 1673 1674 return 1; 1675 } 1676 __setup("ip=", ip_auto_config_setup); 1677 1678 static int __init nfsaddrs_config_setup(char *addrs) 1679 { 1680 return ip_auto_config_setup(addrs); 1681 } 1682 __setup("nfsaddrs=", nfsaddrs_config_setup); 1683 1684 static int __init vendor_class_identifier_setup(char *addrs) 1685 { 1686 if (strlcpy(vendor_class_identifier, addrs, 1687 sizeof(vendor_class_identifier)) 1688 >= sizeof(vendor_class_identifier)) 1689 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"", 1690 vendor_class_identifier); 1691 return 1; 1692 } 1693 __setup("dhcpclass=", vendor_class_identifier_setup); 1694