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 * DHCP/BOOTP support. 587 */ 588 589 #ifdef IPCONFIG_BOOTP 590 591 struct bootp_pkt { /* BOOTP packet format */ 592 struct iphdr iph; /* IP header */ 593 struct udphdr udph; /* UDP header */ 594 u8 op; /* 1=request, 2=reply */ 595 u8 htype; /* HW address type */ 596 u8 hlen; /* HW address length */ 597 u8 hops; /* Used only by gateways */ 598 __be32 xid; /* Transaction ID */ 599 __be16 secs; /* Seconds since we started */ 600 __be16 flags; /* Just what it says */ 601 __be32 client_ip; /* Client's IP address if known */ 602 __be32 your_ip; /* Assigned IP address */ 603 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 604 __be32 relay_ip; /* IP address of BOOTP relay */ 605 u8 hw_addr[16]; /* Client's HW address */ 606 u8 serv_name[64]; /* Server host name */ 607 u8 boot_file[128]; /* Name of boot file */ 608 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 609 }; 610 611 /* packet ops */ 612 #define BOOTP_REQUEST 1 613 #define BOOTP_REPLY 2 614 615 /* DHCP message types */ 616 #define DHCPDISCOVER 1 617 #define DHCPOFFER 2 618 #define DHCPREQUEST 3 619 #define DHCPDECLINE 4 620 #define DHCPACK 5 621 #define DHCPNAK 6 622 #define DHCPRELEASE 7 623 #define DHCPINFORM 8 624 625 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 626 627 static struct packet_type bootp_packet_type __initdata = { 628 .type = cpu_to_be16(ETH_P_IP), 629 .func = ic_bootp_recv, 630 }; 631 632 633 /* 634 * Initialize DHCP/BOOTP extension fields in the request. 635 */ 636 637 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 638 639 #ifdef IPCONFIG_DHCP 640 641 static void __init 642 ic_dhcp_init_options(u8 *options) 643 { 644 u8 mt = ((ic_servaddr == NONE) 645 ? DHCPDISCOVER : DHCPREQUEST); 646 u8 *e = options; 647 int len; 648 649 #ifdef IPCONFIG_DEBUG 650 printk("DHCP: Sending message type %d\n", mt); 651 #endif 652 653 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 654 e += 4; 655 656 *e++ = 53; /* DHCP message type */ 657 *e++ = 1; 658 *e++ = mt; 659 660 if (mt == DHCPREQUEST) { 661 *e++ = 54; /* Server ID (IP address) */ 662 *e++ = 4; 663 memcpy(e, &ic_servaddr, 4); 664 e += 4; 665 666 *e++ = 50; /* Requested IP address */ 667 *e++ = 4; 668 memcpy(e, &ic_myaddr, 4); 669 e += 4; 670 } 671 672 /* always? */ 673 { 674 static const u8 ic_req_params[] = { 675 1, /* Subnet mask */ 676 3, /* Default gateway */ 677 6, /* DNS server */ 678 12, /* Host name */ 679 15, /* Domain name */ 680 17, /* Boot path */ 681 26, /* MTU */ 682 40, /* NIS domain name */ 683 }; 684 685 *e++ = 55; /* Parameter request list */ 686 *e++ = sizeof(ic_req_params); 687 memcpy(e, ic_req_params, sizeof(ic_req_params)); 688 e += sizeof(ic_req_params); 689 690 if (ic_host_name_set) { 691 *e++ = 12; /* host-name */ 692 len = strlen(utsname()->nodename); 693 *e++ = len; 694 memcpy(e, utsname()->nodename, len); 695 e += len; 696 } 697 if (*vendor_class_identifier) { 698 pr_info("DHCP: sending class identifier \"%s\"\n", 699 vendor_class_identifier); 700 *e++ = 60; /* Class-identifier */ 701 len = strlen(vendor_class_identifier); 702 *e++ = len; 703 memcpy(e, vendor_class_identifier, len); 704 e += len; 705 } 706 } 707 708 *e++ = 255; /* End of the list */ 709 } 710 711 #endif /* IPCONFIG_DHCP */ 712 713 static void __init ic_bootp_init_ext(u8 *e) 714 { 715 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 716 e += 4; 717 *e++ = 1; /* Subnet mask request */ 718 *e++ = 4; 719 e += 4; 720 *e++ = 3; /* Default gateway request */ 721 *e++ = 4; 722 e += 4; 723 *e++ = 5; /* Name server request */ 724 *e++ = 8; 725 e += 8; 726 *e++ = 12; /* Host name request */ 727 *e++ = 32; 728 e += 32; 729 *e++ = 40; /* NIS Domain name request */ 730 *e++ = 32; 731 e += 32; 732 *e++ = 17; /* Boot path */ 733 *e++ = 40; 734 e += 40; 735 736 *e++ = 57; /* set extension buffer size for reply */ 737 *e++ = 2; 738 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 739 *e++ = 150; 740 741 *e++ = 255; /* End of the list */ 742 } 743 744 745 /* 746 * Initialize the DHCP/BOOTP mechanism. 747 */ 748 static inline void __init ic_bootp_init(void) 749 { 750 int i; 751 752 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 753 ic_nameservers[i] = NONE; 754 755 dev_add_pack(&bootp_packet_type); 756 } 757 758 759 /* 760 * DHCP/BOOTP cleanup. 761 */ 762 static inline void __init ic_bootp_cleanup(void) 763 { 764 dev_remove_pack(&bootp_packet_type); 765 } 766 767 768 /* 769 * Send DHCP/BOOTP request to single interface. 770 */ 771 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 772 { 773 struct net_device *dev = d->dev; 774 struct sk_buff *skb; 775 struct bootp_pkt *b; 776 struct iphdr *h; 777 int hlen = LL_RESERVED_SPACE(dev); 778 int tlen = dev->needed_tailroom; 779 780 /* Allocate packet */ 781 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, 782 GFP_KERNEL); 783 if (!skb) 784 return; 785 skb_reserve(skb, hlen); 786 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 787 memset(b, 0, sizeof(struct bootp_pkt)); 788 789 /* Construct IP header */ 790 skb_reset_network_header(skb); 791 h = ip_hdr(skb); 792 h->version = 4; 793 h->ihl = 5; 794 h->tot_len = htons(sizeof(struct bootp_pkt)); 795 h->frag_off = htons(IP_DF); 796 h->ttl = 64; 797 h->protocol = IPPROTO_UDP; 798 h->daddr = htonl(INADDR_BROADCAST); 799 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 800 801 /* Construct UDP header */ 802 b->udph.source = htons(68); 803 b->udph.dest = htons(67); 804 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 805 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 806 807 /* Construct DHCP/BOOTP header */ 808 b->op = BOOTP_REQUEST; 809 if (dev->type < 256) /* check for false types */ 810 b->htype = dev->type; 811 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ 812 b->htype = ARPHRD_IEEE802; 813 else if (dev->type == ARPHRD_FDDI) 814 b->htype = ARPHRD_ETHER; 815 else { 816 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 817 b->htype = dev->type; /* can cause undefined behavior */ 818 } 819 820 /* server_ip and your_ip address are both already zero per RFC2131 */ 821 b->hlen = dev->addr_len; 822 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 823 b->secs = htons(jiffies_diff / HZ); 824 b->xid = d->xid; 825 826 /* add DHCP options or BOOTP extensions */ 827 #ifdef IPCONFIG_DHCP 828 if (ic_proto_enabled & IC_USE_DHCP) 829 ic_dhcp_init_options(b->exten); 830 else 831 #endif 832 ic_bootp_init_ext(b->exten); 833 834 /* Chain packet down the line... */ 835 skb->dev = dev; 836 skb->protocol = htons(ETH_P_IP); 837 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 838 dev->broadcast, dev->dev_addr, skb->len) < 0) { 839 kfree_skb(skb); 840 printk("E"); 841 return; 842 } 843 844 if (dev_queue_xmit(skb) < 0) 845 printk("E"); 846 } 847 848 849 /* 850 * Copy BOOTP-supplied string if not already set. 851 */ 852 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 853 { 854 if (!len) 855 return 0; 856 if (len > max-1) 857 len = max-1; 858 memcpy(dest, src, len); 859 dest[len] = '\0'; 860 return 1; 861 } 862 863 864 /* 865 * Process BOOTP extensions. 866 */ 867 static void __init ic_do_bootp_ext(u8 *ext) 868 { 869 u8 servers; 870 int i; 871 __be16 mtu; 872 873 #ifdef IPCONFIG_DEBUG 874 u8 *c; 875 876 printk("DHCP/BOOTP: Got extension %d:",*ext); 877 for (c=ext+2; c<ext+2+ext[1]; c++) 878 printk(" %02x", *c); 879 printk("\n"); 880 #endif 881 882 switch (*ext++) { 883 case 1: /* Subnet mask */ 884 if (ic_netmask == NONE) 885 memcpy(&ic_netmask, ext+1, 4); 886 break; 887 case 3: /* Default gateway */ 888 if (ic_gateway == NONE) 889 memcpy(&ic_gateway, ext+1, 4); 890 break; 891 case 6: /* DNS server */ 892 servers= *ext/4; 893 if (servers > CONF_NAMESERVERS_MAX) 894 servers = CONF_NAMESERVERS_MAX; 895 for (i = 0; i < servers; i++) { 896 if (ic_nameservers[i] == NONE) 897 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 898 } 899 break; 900 case 12: /* Host name */ 901 ic_bootp_string(utsname()->nodename, ext+1, *ext, 902 __NEW_UTS_LEN); 903 ic_host_name_set = 1; 904 break; 905 case 15: /* Domain name (DNS) */ 906 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 907 break; 908 case 17: /* Root path */ 909 if (!root_server_path[0]) 910 ic_bootp_string(root_server_path, ext+1, *ext, 911 sizeof(root_server_path)); 912 break; 913 case 26: /* Interface MTU */ 914 memcpy(&mtu, ext+1, sizeof(mtu)); 915 ic_dev_mtu = ntohs(mtu); 916 break; 917 case 40: /* NIS Domain name (_not_ DNS) */ 918 ic_bootp_string(utsname()->domainname, ext+1, *ext, 919 __NEW_UTS_LEN); 920 break; 921 } 922 } 923 924 925 /* 926 * Receive BOOTP reply. 927 */ 928 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 929 { 930 struct bootp_pkt *b; 931 struct iphdr *h; 932 struct ic_device *d; 933 int len, ext_len; 934 935 if (!net_eq(dev_net(dev), &init_net)) 936 goto drop; 937 938 /* Perform verifications before taking the lock. */ 939 if (skb->pkt_type == PACKET_OTHERHOST) 940 goto drop; 941 942 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 943 return NET_RX_DROP; 944 945 if (!pskb_may_pull(skb, 946 sizeof(struct iphdr) + 947 sizeof(struct udphdr))) 948 goto drop; 949 950 b = (struct bootp_pkt *)skb_network_header(skb); 951 h = &b->iph; 952 953 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 954 goto drop; 955 956 /* Fragments are not supported */ 957 if (ip_is_fragment(h)) { 958 if (net_ratelimit()) 959 pr_err("DHCP/BOOTP: Ignoring fragmented reply\n"); 960 goto drop; 961 } 962 963 if (skb->len < ntohs(h->tot_len)) 964 goto drop; 965 966 if (ip_fast_csum((char *) h, h->ihl)) 967 goto drop; 968 969 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 970 goto drop; 971 972 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 973 goto drop; 974 975 len = ntohs(b->udph.len) - sizeof(struct udphdr); 976 ext_len = len - (sizeof(*b) - 977 sizeof(struct iphdr) - 978 sizeof(struct udphdr) - 979 sizeof(b->exten)); 980 if (ext_len < 0) 981 goto drop; 982 983 /* Ok the front looks good, make sure we can get at the rest. */ 984 if (!pskb_may_pull(skb, skb->len)) 985 goto drop; 986 987 b = (struct bootp_pkt *)skb_network_header(skb); 988 h = &b->iph; 989 990 /* One reply at a time, please. */ 991 spin_lock(&ic_recv_lock); 992 993 /* If we already have a reply, just drop the packet */ 994 if (ic_got_reply) 995 goto drop_unlock; 996 997 /* Find the ic_device that the packet arrived on */ 998 d = ic_first_dev; 999 while (d && d->dev != dev) 1000 d = d->next; 1001 if (!d) 1002 goto drop_unlock; /* should never happen */ 1003 1004 /* Is it a reply to our BOOTP request? */ 1005 if (b->op != BOOTP_REPLY || 1006 b->xid != d->xid) { 1007 if (net_ratelimit()) 1008 pr_err("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n", 1009 b->op, b->xid); 1010 goto drop_unlock; 1011 } 1012 1013 /* Is it a reply for the device we are configuring? */ 1014 if (b->xid != ic_dev_xid) { 1015 if (net_ratelimit()) 1016 pr_err("DHCP/BOOTP: Ignoring delayed packet\n"); 1017 goto drop_unlock; 1018 } 1019 1020 /* Parse extensions */ 1021 if (ext_len >= 4 && 1022 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1023 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1024 u8 *ext; 1025 1026 #ifdef IPCONFIG_DHCP 1027 if (ic_proto_enabled & IC_USE_DHCP) { 1028 __be32 server_id = NONE; 1029 int mt = 0; 1030 1031 ext = &b->exten[4]; 1032 while (ext < end && *ext != 0xff) { 1033 u8 *opt = ext++; 1034 if (*opt == 0) /* Padding */ 1035 continue; 1036 ext += *ext + 1; 1037 if (ext >= end) 1038 break; 1039 switch (*opt) { 1040 case 53: /* Message type */ 1041 if (opt[1]) 1042 mt = opt[2]; 1043 break; 1044 case 54: /* Server ID (IP address) */ 1045 if (opt[1] >= 4) 1046 memcpy(&server_id, opt + 2, 4); 1047 break; 1048 } 1049 } 1050 1051 #ifdef IPCONFIG_DEBUG 1052 printk("DHCP: Got message type %d\n", mt); 1053 #endif 1054 1055 switch (mt) { 1056 case DHCPOFFER: 1057 /* While in the process of accepting one offer, 1058 * ignore all others. 1059 */ 1060 if (ic_myaddr != NONE) 1061 goto drop_unlock; 1062 1063 /* Let's accept that offer. */ 1064 ic_myaddr = b->your_ip; 1065 ic_servaddr = server_id; 1066 #ifdef IPCONFIG_DEBUG 1067 printk("DHCP: Offered address %pI4 by server %pI4\n", 1068 &ic_myaddr, &ic_servaddr); 1069 #endif 1070 /* The DHCP indicated server address takes 1071 * precedence over the bootp header one if 1072 * they are different. 1073 */ 1074 if ((server_id != NONE) && 1075 (b->server_ip != server_id)) 1076 b->server_ip = ic_servaddr; 1077 break; 1078 1079 case DHCPACK: 1080 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1081 goto drop_unlock; 1082 1083 /* Yeah! */ 1084 break; 1085 1086 default: 1087 /* Urque. Forget it*/ 1088 ic_myaddr = NONE; 1089 ic_servaddr = NONE; 1090 goto drop_unlock; 1091 } 1092 1093 ic_dhcp_msgtype = mt; 1094 1095 } 1096 #endif /* IPCONFIG_DHCP */ 1097 1098 ext = &b->exten[4]; 1099 while (ext < end && *ext != 0xff) { 1100 u8 *opt = ext++; 1101 if (*opt == 0) /* Padding */ 1102 continue; 1103 ext += *ext + 1; 1104 if (ext < end) 1105 ic_do_bootp_ext(opt); 1106 } 1107 } 1108 1109 /* We have a winner! */ 1110 ic_dev = dev; 1111 ic_myaddr = b->your_ip; 1112 ic_servaddr = b->server_ip; 1113 if (ic_gateway == NONE && b->relay_ip) 1114 ic_gateway = b->relay_ip; 1115 if (ic_nameservers[0] == NONE) 1116 ic_nameservers[0] = ic_servaddr; 1117 ic_got_reply = IC_BOOTP; 1118 1119 drop_unlock: 1120 /* Show's over. Nothing to see here. */ 1121 spin_unlock(&ic_recv_lock); 1122 1123 drop: 1124 /* Throw the packet out. */ 1125 kfree_skb(skb); 1126 1127 return 0; 1128 } 1129 1130 1131 #endif 1132 1133 1134 /* 1135 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1136 */ 1137 1138 #ifdef IPCONFIG_DYNAMIC 1139 1140 static int __init ic_dynamic(void) 1141 { 1142 int retries; 1143 struct ic_device *d; 1144 unsigned long start_jiffies, timeout, jiff; 1145 int do_bootp = ic_proto_have_if & IC_BOOTP; 1146 int do_rarp = ic_proto_have_if & IC_RARP; 1147 1148 /* 1149 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1150 * This routine gets only called when some pieces of information 1151 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1152 */ 1153 if (!ic_proto_enabled) { 1154 pr_err("IP-Config: Incomplete network configuration information\n"); 1155 return -1; 1156 } 1157 1158 #ifdef IPCONFIG_BOOTP 1159 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1160 pr_err("DHCP/BOOTP: No suitable device found\n"); 1161 #endif 1162 #ifdef IPCONFIG_RARP 1163 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1164 pr_err("RARP: No suitable device found\n"); 1165 #endif 1166 1167 if (!ic_proto_have_if) 1168 /* Error message already printed */ 1169 return -1; 1170 1171 /* 1172 * Setup protocols 1173 */ 1174 #ifdef IPCONFIG_BOOTP 1175 if (do_bootp) 1176 ic_bootp_init(); 1177 #endif 1178 #ifdef IPCONFIG_RARP 1179 if (do_rarp) 1180 ic_rarp_init(); 1181 #endif 1182 1183 /* 1184 * Send requests and wait, until we get an answer. This loop 1185 * seems to be a terrible waste of CPU time, but actually there is 1186 * only one process running at all, so we don't need to use any 1187 * scheduler functions. 1188 * [Actually we could now, but the nothing else running note still 1189 * applies.. - AC] 1190 */ 1191 pr_notice("Sending %s%s%s requests .", 1192 do_bootp 1193 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1194 (do_bootp && do_rarp) ? " and " : "", 1195 do_rarp ? "RARP" : ""); 1196 1197 start_jiffies = jiffies; 1198 d = ic_first_dev; 1199 retries = CONF_SEND_RETRIES; 1200 get_random_bytes(&timeout, sizeof(timeout)); 1201 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); 1202 for (;;) { 1203 /* Track the device we are configuring */ 1204 ic_dev_xid = d->xid; 1205 1206 #ifdef IPCONFIG_BOOTP 1207 if (do_bootp && (d->able & IC_BOOTP)) 1208 ic_bootp_send_if(d, jiffies - start_jiffies); 1209 #endif 1210 #ifdef IPCONFIG_RARP 1211 if (do_rarp && (d->able & IC_RARP)) 1212 ic_rarp_send_if(d); 1213 #endif 1214 1215 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1216 while (time_before(jiffies, jiff) && !ic_got_reply) 1217 schedule_timeout_uninterruptible(1); 1218 #ifdef IPCONFIG_DHCP 1219 /* DHCP isn't done until we get a DHCPACK. */ 1220 if ((ic_got_reply & IC_BOOTP) && 1221 (ic_proto_enabled & IC_USE_DHCP) && 1222 ic_dhcp_msgtype != DHCPACK) { 1223 ic_got_reply = 0; 1224 pr_cont(","); 1225 continue; 1226 } 1227 #endif /* IPCONFIG_DHCP */ 1228 1229 if (ic_got_reply) { 1230 pr_cont(" OK\n"); 1231 break; 1232 } 1233 1234 if ((d = d->next)) 1235 continue; 1236 1237 if (! --retries) { 1238 pr_cont(" timed out!\n"); 1239 break; 1240 } 1241 1242 d = ic_first_dev; 1243 1244 timeout = timeout CONF_TIMEOUT_MULT; 1245 if (timeout > CONF_TIMEOUT_MAX) 1246 timeout = CONF_TIMEOUT_MAX; 1247 1248 pr_cont("."); 1249 } 1250 1251 #ifdef IPCONFIG_BOOTP 1252 if (do_bootp) 1253 ic_bootp_cleanup(); 1254 #endif 1255 #ifdef IPCONFIG_RARP 1256 if (do_rarp) 1257 ic_rarp_cleanup(); 1258 #endif 1259 1260 if (!ic_got_reply) { 1261 ic_myaddr = NONE; 1262 return -1; 1263 } 1264 1265 printk("IP-Config: Got %s answer from %pI4, ", 1266 ((ic_got_reply & IC_RARP) ? "RARP" 1267 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1268 &ic_servaddr); 1269 pr_cont("my address is %pI4\n", &ic_myaddr); 1270 1271 return 0; 1272 } 1273 1274 #endif /* IPCONFIG_DYNAMIC */ 1275 1276 #ifdef CONFIG_PROC_FS 1277 1278 static int pnp_seq_show(struct seq_file *seq, void *v) 1279 { 1280 int i; 1281 1282 if (ic_proto_used & IC_PROTO) 1283 seq_printf(seq, "#PROTO: %s\n", 1284 (ic_proto_used & IC_RARP) ? "RARP" 1285 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1286 else 1287 seq_puts(seq, "#MANUAL\n"); 1288 1289 if (ic_domain[0]) 1290 seq_printf(seq, 1291 "domain %s\n", ic_domain); 1292 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1293 if (ic_nameservers[i] != NONE) 1294 seq_printf(seq, "nameserver %pI4\n", 1295 &ic_nameservers[i]); 1296 } 1297 if (ic_servaddr != NONE) 1298 seq_printf(seq, "bootserver %pI4\n", 1299 &ic_servaddr); 1300 return 0; 1301 } 1302 1303 static int pnp_seq_open(struct inode *indoe, struct file *file) 1304 { 1305 return single_open(file, pnp_seq_show, NULL); 1306 } 1307 1308 static const struct file_operations pnp_seq_fops = { 1309 .owner = THIS_MODULE, 1310 .open = pnp_seq_open, 1311 .read = seq_read, 1312 .llseek = seq_lseek, 1313 .release = single_release, 1314 }; 1315 #endif /* CONFIG_PROC_FS */ 1316 1317 /* 1318 * Extract IP address from the parameter string if needed. Note that we 1319 * need to have root_server_addr set _before_ IPConfig gets called as it 1320 * can override it. 1321 */ 1322 __be32 __init root_nfs_parse_addr(char *name) 1323 { 1324 __be32 addr; 1325 int octets = 0; 1326 char *cp, *cq; 1327 1328 cp = cq = name; 1329 while (octets < 4) { 1330 while (*cp >= '0' && *cp <= '9') 1331 cp++; 1332 if (cp == cq || cp - cq > 3) 1333 break; 1334 if (*cp == '.' || octets == 3) 1335 octets++; 1336 if (octets < 4) 1337 cp++; 1338 cq = cp; 1339 } 1340 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1341 if (*cp == ':') 1342 *cp++ = '\0'; 1343 addr = in_aton(name); 1344 memmove(name, cp, strlen(cp) + 1); 1345 } else 1346 addr = NONE; 1347 1348 return addr; 1349 } 1350 1351 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1352 1353 static int __init wait_for_devices(void) 1354 { 1355 int i; 1356 1357 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1358 struct net_device *dev; 1359 int found = 0; 1360 1361 rtnl_lock(); 1362 for_each_netdev(&init_net, dev) { 1363 if (ic_is_init_dev(dev)) { 1364 found = 1; 1365 break; 1366 } 1367 } 1368 rtnl_unlock(); 1369 if (found) 1370 return 0; 1371 ssleep(1); 1372 } 1373 return -ENODEV; 1374 } 1375 1376 /* 1377 * IP Autoconfig dispatcher. 1378 */ 1379 1380 static int __init ip_auto_config(void) 1381 { 1382 __be32 addr; 1383 #ifdef IPCONFIG_DYNAMIC 1384 int retries = CONF_OPEN_RETRIES; 1385 #endif 1386 int err; 1387 1388 #ifdef CONFIG_PROC_FS 1389 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops); 1390 #endif /* CONFIG_PROC_FS */ 1391 1392 if (!ic_enable) 1393 return 0; 1394 1395 DBG(("IP-Config: Entered.\n")); 1396 #ifdef IPCONFIG_DYNAMIC 1397 try_try_again: 1398 #endif 1399 /* Wait for devices to appear */ 1400 err = wait_for_devices(); 1401 if (err) 1402 return err; 1403 1404 /* Setup all network devices */ 1405 err = ic_open_devs(); 1406 if (err) 1407 return err; 1408 1409 /* Give drivers a chance to settle */ 1410 msleep(CONF_POST_OPEN); 1411 1412 /* 1413 * If the config information is insufficient (e.g., our IP address or 1414 * IP address of the boot server is missing or we have multiple network 1415 * interfaces and no default was set), use BOOTP or RARP to get the 1416 * missing values. 1417 */ 1418 if (ic_myaddr == NONE || 1419 #ifdef CONFIG_ROOT_NFS 1420 (root_server_addr == NONE && 1421 ic_servaddr == NONE && 1422 ROOT_DEV == Root_NFS) || 1423 #endif 1424 ic_first_dev->next) { 1425 #ifdef IPCONFIG_DYNAMIC 1426 if (ic_dynamic() < 0) { 1427 ic_close_devs(); 1428 1429 /* 1430 * I don't know why, but sometimes the 1431 * eepro100 driver (at least) gets upset and 1432 * doesn't work the first time it's opened. 1433 * But then if you close it and reopen it, it 1434 * works just fine. So we need to try that at 1435 * least once before giving up. 1436 * 1437 * Also, if the root will be NFS-mounted, we 1438 * have nowhere to go if DHCP fails. So we 1439 * just have to keep trying forever. 1440 * 1441 * -- Chip 1442 */ 1443 #ifdef CONFIG_ROOT_NFS 1444 if (ROOT_DEV == Root_NFS) { 1445 pr_err("IP-Config: Retrying forever (NFS root)...\n"); 1446 goto try_try_again; 1447 } 1448 #endif 1449 1450 if (--retries) { 1451 pr_err("IP-Config: Reopening network devices...\n"); 1452 goto try_try_again; 1453 } 1454 1455 /* Oh, well. At least we tried. */ 1456 pr_err("IP-Config: Auto-configuration of network failed\n"); 1457 return -1; 1458 } 1459 #else /* !DYNAMIC */ 1460 pr_err("IP-Config: Incomplete network configuration information\n"); 1461 ic_close_devs(); 1462 return -1; 1463 #endif /* IPCONFIG_DYNAMIC */ 1464 } else { 1465 /* Device selected manually or only one device -> use it */ 1466 ic_dev = ic_first_dev->dev; 1467 } 1468 1469 addr = root_nfs_parse_addr(root_server_path); 1470 if (root_server_addr == NONE) 1471 root_server_addr = addr; 1472 1473 /* 1474 * Use defaults wherever applicable. 1475 */ 1476 if (ic_defaults() < 0) 1477 return -1; 1478 1479 /* 1480 * Close all network devices except the device we've 1481 * autoconfigured and set up routes. 1482 */ 1483 ic_close_devs(); 1484 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1485 return -1; 1486 1487 /* 1488 * Record which protocol was actually used. 1489 */ 1490 #ifdef IPCONFIG_DYNAMIC 1491 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1492 #endif 1493 1494 #ifndef IPCONFIG_SILENT 1495 /* 1496 * Clue in the operator. 1497 */ 1498 pr_info("IP-Config: Complete:\n"); 1499 pr_info(" device=%s, addr=%pI4, mask=%pI4, gw=%pI4\n", 1500 ic_dev->name, &ic_myaddr, &ic_netmask, &ic_gateway); 1501 pr_info(" host=%s, domain=%s, nis-domain=%s\n", 1502 utsname()->nodename, ic_domain, utsname()->domainname); 1503 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", 1504 &ic_servaddr, &root_server_addr, root_server_path); 1505 if (ic_dev_mtu) 1506 pr_cont(", mtu=%d", ic_dev_mtu); 1507 pr_cont("\n"); 1508 #endif /* !SILENT */ 1509 1510 return 0; 1511 } 1512 1513 late_initcall(ip_auto_config); 1514 1515 1516 /* 1517 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1518 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. 1519 */ 1520 static int __init ic_proto_name(char *name) 1521 { 1522 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1523 return 1; 1524 } 1525 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1526 return 0; 1527 } 1528 #ifdef CONFIG_IP_PNP_DHCP 1529 else if (!strcmp(name, "dhcp")) { 1530 ic_proto_enabled &= ~IC_RARP; 1531 return 1; 1532 } 1533 #endif 1534 #ifdef CONFIG_IP_PNP_BOOTP 1535 else if (!strcmp(name, "bootp")) { 1536 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1537 return 1; 1538 } 1539 #endif 1540 #ifdef CONFIG_IP_PNP_RARP 1541 else if (!strcmp(name, "rarp")) { 1542 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1543 return 1; 1544 } 1545 #endif 1546 #ifdef IPCONFIG_DYNAMIC 1547 else if (!strcmp(name, "both")) { 1548 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1549 return 1; 1550 } 1551 #endif 1552 return 0; 1553 } 1554 1555 static int __init ip_auto_config_setup(char *addrs) 1556 { 1557 char *cp, *ip, *dp; 1558 int num = 0; 1559 1560 ic_set_manually = 1; 1561 ic_enable = 1; 1562 1563 /* 1564 * If any dhcp, bootp etc options are set, leave autoconfig on 1565 * and skip the below static IP processing. 1566 */ 1567 if (ic_proto_name(addrs)) 1568 return 1; 1569 1570 /* If no static IP is given, turn off autoconfig and bail. */ 1571 if (*addrs == 0 || 1572 strcmp(addrs, "off") == 0 || 1573 strcmp(addrs, "none") == 0) { 1574 ic_enable = 0; 1575 return 1; 1576 } 1577 1578 /* Parse string for static IP assignment. */ 1579 ip = addrs; 1580 while (ip && *ip) { 1581 if ((cp = strchr(ip, ':'))) 1582 *cp++ = '\0'; 1583 if (strlen(ip) > 0) { 1584 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); 1585 switch (num) { 1586 case 0: 1587 if ((ic_myaddr = in_aton(ip)) == ANY) 1588 ic_myaddr = NONE; 1589 break; 1590 case 1: 1591 if ((ic_servaddr = in_aton(ip)) == ANY) 1592 ic_servaddr = NONE; 1593 break; 1594 case 2: 1595 if ((ic_gateway = in_aton(ip)) == ANY) 1596 ic_gateway = NONE; 1597 break; 1598 case 3: 1599 if ((ic_netmask = in_aton(ip)) == ANY) 1600 ic_netmask = NONE; 1601 break; 1602 case 4: 1603 if ((dp = strchr(ip, '.'))) { 1604 *dp++ = '\0'; 1605 strlcpy(utsname()->domainname, dp, 1606 sizeof(utsname()->domainname)); 1607 } 1608 strlcpy(utsname()->nodename, ip, 1609 sizeof(utsname()->nodename)); 1610 ic_host_name_set = 1; 1611 break; 1612 case 5: 1613 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1614 break; 1615 case 6: 1616 if (ic_proto_name(ip) == 0 && 1617 ic_myaddr == NONE) { 1618 ic_enable = 0; 1619 } 1620 break; 1621 } 1622 } 1623 ip = cp; 1624 num++; 1625 } 1626 1627 return 1; 1628 } 1629 1630 static int __init nfsaddrs_config_setup(char *addrs) 1631 { 1632 return ip_auto_config_setup(addrs); 1633 } 1634 1635 static int __init vendor_class_identifier_setup(char *addrs) 1636 { 1637 if (strlcpy(vendor_class_identifier, addrs, 1638 sizeof(vendor_class_identifier)) 1639 >= sizeof(vendor_class_identifier)) 1640 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"", 1641 vendor_class_identifier); 1642 return 1; 1643 } 1644 1645 __setup("ip=", ip_auto_config_setup); 1646 __setup("nfsaddrs=", nfsaddrs_config_setup); 1647 __setup("dhcpclass=", vendor_class_identifier_setup); 1648