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 #if defined(CONFIG_IP_PNP_DHCP) 69 #define IPCONFIG_DHCP 70 #endif 71 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) 72 #define IPCONFIG_BOOTP 73 #endif 74 #if defined(CONFIG_IP_PNP_RARP) 75 #define IPCONFIG_RARP 76 #endif 77 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) 78 #define IPCONFIG_DYNAMIC 79 #endif 80 81 /* Define the friendly delay before and after opening net devices */ 82 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */ 83 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */ 84 85 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ 86 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ 87 #define CONF_SEND_RETRIES 6 /* Send six requests per open */ 88 #define CONF_INTER_TIMEOUT (HZ) /* Inter-device timeout: 1 second */ 89 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ 90 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ 91 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ 92 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ 93 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers 94 - '3' from resolv.h */ 95 96 #define NONE cpu_to_be32(INADDR_NONE) 97 #define ANY cpu_to_be32(INADDR_ANY) 98 99 /* 100 * Public IP configuration 101 */ 102 103 /* This is used by platforms which might be able to set the ipconfig 104 * variables using firmware environment vars. If this is set, it will 105 * ignore such firmware variables. 106 */ 107 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ 108 109 static int ic_enable __initdata; /* IP config enabled? */ 110 111 /* Protocol choice */ 112 int ic_proto_enabled __initdata = 0 113 #ifdef IPCONFIG_BOOTP 114 | IC_BOOTP 115 #endif 116 #ifdef CONFIG_IP_PNP_DHCP 117 | IC_USE_DHCP 118 #endif 119 #ifdef IPCONFIG_RARP 120 | IC_RARP 121 #endif 122 ; 123 124 static int ic_host_name_set __initdata; /* Host name set by us? */ 125 126 __be32 ic_myaddr = NONE; /* My IP address */ 127 static __be32 ic_netmask = NONE; /* Netmask for local subnet */ 128 __be32 ic_gateway = NONE; /* Gateway IP address */ 129 130 __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */ 131 132 __be32 ic_servaddr = NONE; /* Boot server IP address */ 133 134 __be32 root_server_addr = NONE; /* Address of NFS server */ 135 u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 136 137 /* vendor class identifier */ 138 static char vendor_class_identifier[253] __initdata; 139 140 #if defined(CONFIG_IP_PNP_DHCP) 141 static char dhcp_client_identifier[253] __initdata; 142 #endif 143 144 /* Persistent data: */ 145 146 #ifdef IPCONFIG_DYNAMIC 147 static int ic_proto_used; /* Protocol used, if any */ 148 #else 149 #define ic_proto_used 0 150 #endif 151 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 152 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 153 154 /* 155 * Private state. 156 */ 157 158 /* Name of user-selected boot device */ 159 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 160 161 /* Protocols supported by available interfaces */ 162 static int ic_proto_have_if __initdata; 163 164 /* MTU for boot device */ 165 static int ic_dev_mtu __initdata; 166 167 #ifdef IPCONFIG_DYNAMIC 168 static DEFINE_SPINLOCK(ic_recv_lock); 169 static volatile int ic_got_reply __initdata; /* Proto(s) that replied */ 170 #endif 171 #ifdef IPCONFIG_DHCP 172 static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */ 173 #endif 174 175 176 /* 177 * Network devices 178 */ 179 180 struct ic_device { 181 struct ic_device *next; 182 struct net_device *dev; 183 unsigned short flags; 184 short able; 185 __be32 xid; 186 }; 187 188 static struct ic_device *ic_first_dev __initdata; /* List of open device */ 189 static struct net_device *ic_dev __initdata; /* Selected device */ 190 191 static bool __init ic_is_init_dev(struct net_device *dev) 192 { 193 if (dev->flags & IFF_LOOPBACK) 194 return false; 195 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 196 (!(dev->flags & IFF_LOOPBACK) && 197 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 198 strncmp(dev->name, "dummy", 5)); 199 } 200 201 static int __init ic_open_devs(void) 202 { 203 struct ic_device *d, **last; 204 struct net_device *dev; 205 unsigned short oflags; 206 unsigned long start, next_msg; 207 208 last = &ic_first_dev; 209 rtnl_lock(); 210 211 /* bring loopback and DSA master network devices up first */ 212 for_each_netdev(&init_net, dev) { 213 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev)) 214 continue; 215 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) 216 pr_err("IP-Config: Failed to open %s\n", dev->name); 217 } 218 219 for_each_netdev(&init_net, dev) { 220 if (ic_is_init_dev(dev)) { 221 int able = 0; 222 if (dev->mtu >= 364) 223 able |= IC_BOOTP; 224 else 225 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n", 226 dev->name, dev->mtu); 227 if (!(dev->flags & IFF_NOARP)) 228 able |= IC_RARP; 229 able &= ic_proto_enabled; 230 if (ic_proto_enabled && !able) 231 continue; 232 oflags = dev->flags; 233 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 234 pr_err("IP-Config: Failed to open %s\n", 235 dev->name); 236 continue; 237 } 238 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 239 rtnl_unlock(); 240 return -ENOMEM; 241 } 242 d->dev = dev; 243 *last = d; 244 last = &d->next; 245 d->flags = oflags; 246 d->able = able; 247 if (able & IC_BOOTP) 248 get_random_bytes(&d->xid, sizeof(__be32)); 249 else 250 d->xid = 0; 251 ic_proto_have_if |= able; 252 pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n", 253 dev->name, able, d->xid); 254 } 255 } 256 257 /* no point in waiting if we could not bring up at least one device */ 258 if (!ic_first_dev) 259 goto have_carrier; 260 261 /* wait for a carrier on at least one device */ 262 start = jiffies; 263 next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12); 264 while (time_before(jiffies, start + 265 msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) { 266 int wait, elapsed; 267 268 for_each_netdev(&init_net, dev) 269 if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) 270 goto have_carrier; 271 272 msleep(1); 273 274 if (time_before(jiffies, next_msg)) 275 continue; 276 277 elapsed = jiffies_to_msecs(jiffies - start); 278 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000; 279 pr_info("Waiting up to %d more seconds for network.\n", wait); 280 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12); 281 } 282 have_carrier: 283 rtnl_unlock(); 284 285 *last = NULL; 286 287 if (!ic_first_dev) { 288 if (user_dev_name[0]) 289 pr_err("IP-Config: Device `%s' not found\n", 290 user_dev_name); 291 else 292 pr_err("IP-Config: No network devices available\n"); 293 return -ENODEV; 294 } 295 return 0; 296 } 297 298 static void __init ic_close_devs(void) 299 { 300 struct ic_device *d, *next; 301 struct net_device *dev; 302 303 rtnl_lock(); 304 next = ic_first_dev; 305 while ((d = next)) { 306 next = d->next; 307 dev = d->dev; 308 if (dev != ic_dev && !netdev_uses_dsa(dev)) { 309 pr_debug("IP-Config: Downing %s\n", dev->name); 310 dev_change_flags(dev, d->flags); 311 } 312 kfree(d); 313 } 314 rtnl_unlock(); 315 } 316 317 /* 318 * Interface to various network functions. 319 */ 320 321 static inline void 322 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 323 { 324 sin->sin_family = AF_INET; 325 sin->sin_addr.s_addr = addr; 326 sin->sin_port = port; 327 } 328 329 static int __init ic_devinet_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 = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 336 set_fs(oldfs); 337 return res; 338 } 339 340 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 341 { 342 int res; 343 344 mm_segment_t oldfs = get_fs(); 345 set_fs(get_ds()); 346 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 347 set_fs(oldfs); 348 return res; 349 } 350 351 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 352 { 353 int res; 354 355 mm_segment_t oldfs = get_fs(); 356 set_fs(get_ds()); 357 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); 358 set_fs(oldfs); 359 return res; 360 } 361 362 /* 363 * Set up interface addresses and routes. 364 */ 365 366 static int __init ic_setup_if(void) 367 { 368 struct ifreq ir; 369 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 370 int err; 371 372 memset(&ir, 0, sizeof(ir)); 373 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); 374 set_sockaddr(sin, ic_myaddr, 0); 375 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) { 376 pr_err("IP-Config: Unable to set interface address (%d)\n", 377 err); 378 return -1; 379 } 380 set_sockaddr(sin, ic_netmask, 0); 381 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 382 pr_err("IP-Config: Unable to set interface netmask (%d)\n", 383 err); 384 return -1; 385 } 386 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 387 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 388 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n", 389 err); 390 return -1; 391 } 392 /* Handle the case where we need non-standard MTU on the boot link (a network 393 * using jumbo frames, for instance). If we can't set the mtu, don't error 394 * out, we'll try to muddle along. 395 */ 396 if (ic_dev_mtu != 0) { 397 strcpy(ir.ifr_name, ic_dev->name); 398 ir.ifr_mtu = ic_dev_mtu; 399 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0) 400 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", 401 ic_dev_mtu, err); 402 } 403 return 0; 404 } 405 406 static int __init ic_setup_routes(void) 407 { 408 /* No need to setup device routes, only the default route... */ 409 410 if (ic_gateway != NONE) { 411 struct rtentry rm; 412 int err; 413 414 memset(&rm, 0, sizeof(rm)); 415 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 416 pr_err("IP-Config: Gateway not on directly connected network\n"); 417 return -1; 418 } 419 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 420 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 421 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 422 rm.rt_flags = RTF_UP | RTF_GATEWAY; 423 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 424 pr_err("IP-Config: Cannot add default route (%d)\n", 425 err); 426 return -1; 427 } 428 } 429 430 return 0; 431 } 432 433 /* 434 * Fill in default values for all missing parameters. 435 */ 436 437 static int __init ic_defaults(void) 438 { 439 /* 440 * At this point we have no userspace running so need not 441 * claim locks on system_utsname 442 */ 443 444 if (!ic_host_name_set) 445 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 446 447 if (root_server_addr == NONE) 448 root_server_addr = ic_servaddr; 449 450 if (ic_netmask == NONE) { 451 if (IN_CLASSA(ntohl(ic_myaddr))) 452 ic_netmask = htonl(IN_CLASSA_NET); 453 else if (IN_CLASSB(ntohl(ic_myaddr))) 454 ic_netmask = htonl(IN_CLASSB_NET); 455 else if (IN_CLASSC(ntohl(ic_myaddr))) 456 ic_netmask = htonl(IN_CLASSC_NET); 457 else { 458 pr_err("IP-Config: Unable to guess netmask for address %pI4\n", 459 &ic_myaddr); 460 return -1; 461 } 462 pr_notice("IP-Config: Guessing netmask %pI4\n", 463 &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 pr_debug("DHCP: Sending message type %d\n", mt); 675 676 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 677 e += 4; 678 679 *e++ = 53; /* DHCP message type */ 680 *e++ = 1; 681 *e++ = mt; 682 683 if (mt == DHCPREQUEST) { 684 *e++ = 54; /* Server ID (IP address) */ 685 *e++ = 4; 686 memcpy(e, &ic_servaddr, 4); 687 e += 4; 688 689 *e++ = 50; /* Requested IP address */ 690 *e++ = 4; 691 memcpy(e, &ic_myaddr, 4); 692 e += 4; 693 } 694 695 /* always? */ 696 { 697 static const u8 ic_req_params[] = { 698 1, /* Subnet mask */ 699 3, /* Default gateway */ 700 6, /* DNS server */ 701 12, /* Host name */ 702 15, /* Domain name */ 703 17, /* Boot path */ 704 26, /* MTU */ 705 40, /* NIS domain name */ 706 }; 707 708 *e++ = 55; /* Parameter request list */ 709 *e++ = sizeof(ic_req_params); 710 memcpy(e, ic_req_params, sizeof(ic_req_params)); 711 e += sizeof(ic_req_params); 712 713 if (ic_host_name_set) { 714 *e++ = 12; /* host-name */ 715 len = strlen(utsname()->nodename); 716 *e++ = len; 717 memcpy(e, utsname()->nodename, len); 718 e += len; 719 } 720 if (*vendor_class_identifier) { 721 pr_info("DHCP: sending class identifier \"%s\"\n", 722 vendor_class_identifier); 723 *e++ = 60; /* Class-identifier */ 724 len = strlen(vendor_class_identifier); 725 *e++ = len; 726 memcpy(e, vendor_class_identifier, len); 727 e += len; 728 } 729 len = strlen(dhcp_client_identifier + 1); 730 /* the minimum length of identifier is 2, include 1 byte type, 731 * and can not be larger than the length of options 732 */ 733 if (len >= 1 && len < 312 - (e - options) - 1) { 734 *e++ = 61; 735 *e++ = len + 1; 736 memcpy(e, dhcp_client_identifier, len + 1); 737 e += len + 1; 738 } 739 } 740 741 *e++ = 255; /* End of the list */ 742 } 743 744 #endif /* IPCONFIG_DHCP */ 745 746 static void __init ic_bootp_init_ext(u8 *e) 747 { 748 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 749 e += 4; 750 *e++ = 1; /* Subnet mask request */ 751 *e++ = 4; 752 e += 4; 753 *e++ = 3; /* Default gateway request */ 754 *e++ = 4; 755 e += 4; 756 *e++ = 5; /* Name server request */ 757 *e++ = 8; 758 e += 8; 759 *e++ = 12; /* Host name request */ 760 *e++ = 32; 761 e += 32; 762 *e++ = 40; /* NIS Domain name request */ 763 *e++ = 32; 764 e += 32; 765 *e++ = 17; /* Boot path */ 766 *e++ = 40; 767 e += 40; 768 769 *e++ = 57; /* set extension buffer size for reply */ 770 *e++ = 2; 771 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 772 *e++ = 150; 773 774 *e++ = 255; /* End of the list */ 775 } 776 777 778 /* 779 * Initialize the DHCP/BOOTP mechanism. 780 */ 781 static inline void __init ic_bootp_init(void) 782 { 783 ic_nameservers_predef(); 784 785 dev_add_pack(&bootp_packet_type); 786 } 787 788 789 /* 790 * DHCP/BOOTP cleanup. 791 */ 792 static inline void __init ic_bootp_cleanup(void) 793 { 794 dev_remove_pack(&bootp_packet_type); 795 } 796 797 798 /* 799 * Send DHCP/BOOTP request to single interface. 800 */ 801 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 802 { 803 struct net_device *dev = d->dev; 804 struct sk_buff *skb; 805 struct bootp_pkt *b; 806 struct iphdr *h; 807 int hlen = LL_RESERVED_SPACE(dev); 808 int tlen = dev->needed_tailroom; 809 810 /* Allocate packet */ 811 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, 812 GFP_KERNEL); 813 if (!skb) 814 return; 815 skb_reserve(skb, hlen); 816 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 817 memset(b, 0, sizeof(struct bootp_pkt)); 818 819 /* Construct IP header */ 820 skb_reset_network_header(skb); 821 h = ip_hdr(skb); 822 h->version = 4; 823 h->ihl = 5; 824 h->tot_len = htons(sizeof(struct bootp_pkt)); 825 h->frag_off = htons(IP_DF); 826 h->ttl = 64; 827 h->protocol = IPPROTO_UDP; 828 h->daddr = htonl(INADDR_BROADCAST); 829 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 830 831 /* Construct UDP header */ 832 b->udph.source = htons(68); 833 b->udph.dest = htons(67); 834 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 835 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 836 837 /* Construct DHCP/BOOTP header */ 838 b->op = BOOTP_REQUEST; 839 if (dev->type < 256) /* check for false types */ 840 b->htype = dev->type; 841 else if (dev->type == ARPHRD_FDDI) 842 b->htype = ARPHRD_ETHER; 843 else { 844 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type, 845 dev->name); 846 b->htype = dev->type; /* can cause undefined behavior */ 847 } 848 849 /* server_ip and your_ip address are both already zero per RFC2131 */ 850 b->hlen = dev->addr_len; 851 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 852 b->secs = htons(jiffies_diff / HZ); 853 b->xid = d->xid; 854 855 /* add DHCP options or BOOTP extensions */ 856 #ifdef IPCONFIG_DHCP 857 if (ic_proto_enabled & IC_USE_DHCP) 858 ic_dhcp_init_options(b->exten); 859 else 860 #endif 861 ic_bootp_init_ext(b->exten); 862 863 /* Chain packet down the line... */ 864 skb->dev = dev; 865 skb->protocol = htons(ETH_P_IP); 866 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 867 dev->broadcast, dev->dev_addr, skb->len) < 0) { 868 kfree_skb(skb); 869 printk("E"); 870 return; 871 } 872 873 if (dev_queue_xmit(skb) < 0) 874 printk("E"); 875 } 876 877 878 /* 879 * Copy BOOTP-supplied string if not already set. 880 */ 881 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 882 { 883 if (!len) 884 return 0; 885 if (len > max-1) 886 len = max-1; 887 memcpy(dest, src, len); 888 dest[len] = '\0'; 889 return 1; 890 } 891 892 893 /* 894 * Process BOOTP extensions. 895 */ 896 static void __init ic_do_bootp_ext(u8 *ext) 897 { 898 u8 servers; 899 int i; 900 __be16 mtu; 901 902 u8 *c; 903 904 pr_debug("DHCP/BOOTP: Got extension %d:", *ext); 905 for (c=ext+2; c<ext+2+ext[1]; c++) 906 pr_debug(" %02x", *c); 907 pr_debug("\n"); 908 909 switch (*ext++) { 910 case 1: /* Subnet mask */ 911 if (ic_netmask == NONE) 912 memcpy(&ic_netmask, ext+1, 4); 913 break; 914 case 3: /* Default gateway */ 915 if (ic_gateway == NONE) 916 memcpy(&ic_gateway, ext+1, 4); 917 break; 918 case 6: /* DNS server */ 919 servers= *ext/4; 920 if (servers > CONF_NAMESERVERS_MAX) 921 servers = CONF_NAMESERVERS_MAX; 922 for (i = 0; i < servers; i++) { 923 if (ic_nameservers[i] == NONE) 924 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 925 } 926 break; 927 case 12: /* Host name */ 928 ic_bootp_string(utsname()->nodename, ext+1, *ext, 929 __NEW_UTS_LEN); 930 ic_host_name_set = 1; 931 break; 932 case 15: /* Domain name (DNS) */ 933 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 934 break; 935 case 17: /* Root path */ 936 if (!root_server_path[0]) 937 ic_bootp_string(root_server_path, ext+1, *ext, 938 sizeof(root_server_path)); 939 break; 940 case 26: /* Interface MTU */ 941 memcpy(&mtu, ext+1, sizeof(mtu)); 942 ic_dev_mtu = ntohs(mtu); 943 break; 944 case 40: /* NIS Domain name (_not_ DNS) */ 945 ic_bootp_string(utsname()->domainname, ext+1, *ext, 946 __NEW_UTS_LEN); 947 break; 948 } 949 } 950 951 952 /* 953 * Receive BOOTP reply. 954 */ 955 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 956 { 957 struct bootp_pkt *b; 958 struct iphdr *h; 959 struct ic_device *d; 960 int len, ext_len; 961 962 if (!net_eq(dev_net(dev), &init_net)) 963 goto drop; 964 965 /* Perform verifications before taking the lock. */ 966 if (skb->pkt_type == PACKET_OTHERHOST) 967 goto drop; 968 969 skb = skb_share_check(skb, GFP_ATOMIC); 970 if (!skb) 971 return NET_RX_DROP; 972 973 if (!pskb_may_pull(skb, 974 sizeof(struct iphdr) + 975 sizeof(struct udphdr))) 976 goto drop; 977 978 b = (struct bootp_pkt *)skb_network_header(skb); 979 h = &b->iph; 980 981 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 982 goto drop; 983 984 /* Fragments are not supported */ 985 if (ip_is_fragment(h)) { 986 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); 987 goto drop; 988 } 989 990 if (skb->len < ntohs(h->tot_len)) 991 goto drop; 992 993 if (ip_fast_csum((char *) h, h->ihl)) 994 goto drop; 995 996 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 997 goto drop; 998 999 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 1000 goto drop; 1001 1002 len = ntohs(b->udph.len) - sizeof(struct udphdr); 1003 ext_len = len - (sizeof(*b) - 1004 sizeof(struct iphdr) - 1005 sizeof(struct udphdr) - 1006 sizeof(b->exten)); 1007 if (ext_len < 0) 1008 goto drop; 1009 1010 /* Ok the front looks good, make sure we can get at the rest. */ 1011 if (!pskb_may_pull(skb, skb->len)) 1012 goto drop; 1013 1014 b = (struct bootp_pkt *)skb_network_header(skb); 1015 h = &b->iph; 1016 1017 /* One reply at a time, please. */ 1018 spin_lock(&ic_recv_lock); 1019 1020 /* If we already have a reply, just drop the packet */ 1021 if (ic_got_reply) 1022 goto drop_unlock; 1023 1024 /* Find the ic_device that the packet arrived on */ 1025 d = ic_first_dev; 1026 while (d && d->dev != dev) 1027 d = d->next; 1028 if (!d) 1029 goto drop_unlock; /* should never happen */ 1030 1031 /* Is it a reply to our BOOTP request? */ 1032 if (b->op != BOOTP_REPLY || 1033 b->xid != d->xid) { 1034 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n", 1035 b->op, b->xid); 1036 goto drop_unlock; 1037 } 1038 1039 /* Is it a reply for the device we are configuring? */ 1040 if (b->xid != ic_dev_xid) { 1041 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n"); 1042 goto drop_unlock; 1043 } 1044 1045 /* Parse extensions */ 1046 if (ext_len >= 4 && 1047 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1048 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1049 u8 *ext; 1050 1051 #ifdef IPCONFIG_DHCP 1052 if (ic_proto_enabled & IC_USE_DHCP) { 1053 __be32 server_id = NONE; 1054 int mt = 0; 1055 1056 ext = &b->exten[4]; 1057 while (ext < end && *ext != 0xff) { 1058 u8 *opt = ext++; 1059 if (*opt == 0) /* Padding */ 1060 continue; 1061 ext += *ext + 1; 1062 if (ext >= end) 1063 break; 1064 switch (*opt) { 1065 case 53: /* Message type */ 1066 if (opt[1]) 1067 mt = opt[2]; 1068 break; 1069 case 54: /* Server ID (IP address) */ 1070 if (opt[1] >= 4) 1071 memcpy(&server_id, opt + 2, 4); 1072 break; 1073 } 1074 } 1075 1076 pr_debug("DHCP: Got message type %d\n", mt); 1077 1078 switch (mt) { 1079 case DHCPOFFER: 1080 /* While in the process of accepting one offer, 1081 * ignore all others. 1082 */ 1083 if (ic_myaddr != NONE) 1084 goto drop_unlock; 1085 1086 /* Let's accept that offer. */ 1087 ic_myaddr = b->your_ip; 1088 ic_servaddr = server_id; 1089 pr_debug("DHCP: Offered address %pI4 by server %pI4\n", 1090 &ic_myaddr, &b->iph.saddr); 1091 /* The DHCP indicated server address takes 1092 * precedence over the bootp header one if 1093 * they are different. 1094 */ 1095 if ((server_id != NONE) && 1096 (b->server_ip != server_id)) 1097 b->server_ip = ic_servaddr; 1098 break; 1099 1100 case DHCPACK: 1101 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1102 goto drop_unlock; 1103 1104 /* Yeah! */ 1105 break; 1106 1107 default: 1108 /* Urque. Forget it*/ 1109 ic_myaddr = NONE; 1110 ic_servaddr = NONE; 1111 goto drop_unlock; 1112 } 1113 1114 ic_dhcp_msgtype = mt; 1115 1116 } 1117 #endif /* IPCONFIG_DHCP */ 1118 1119 ext = &b->exten[4]; 1120 while (ext < end && *ext != 0xff) { 1121 u8 *opt = ext++; 1122 if (*opt == 0) /* Padding */ 1123 continue; 1124 ext += *ext + 1; 1125 if (ext < end) 1126 ic_do_bootp_ext(opt); 1127 } 1128 } 1129 1130 /* We have a winner! */ 1131 ic_dev = dev; 1132 ic_myaddr = b->your_ip; 1133 ic_servaddr = b->server_ip; 1134 ic_addrservaddr = b->iph.saddr; 1135 if (ic_gateway == NONE && b->relay_ip) 1136 ic_gateway = b->relay_ip; 1137 if (ic_nameservers[0] == NONE) 1138 ic_nameservers[0] = ic_servaddr; 1139 ic_got_reply = IC_BOOTP; 1140 1141 drop_unlock: 1142 /* Show's over. Nothing to see here. */ 1143 spin_unlock(&ic_recv_lock); 1144 1145 drop: 1146 /* Throw the packet out. */ 1147 kfree_skb(skb); 1148 1149 return 0; 1150 } 1151 1152 1153 #endif 1154 1155 1156 /* 1157 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1158 */ 1159 1160 #ifdef IPCONFIG_DYNAMIC 1161 1162 static int __init ic_dynamic(void) 1163 { 1164 int retries; 1165 struct ic_device *d; 1166 unsigned long start_jiffies, timeout, jiff; 1167 int do_bootp = ic_proto_have_if & IC_BOOTP; 1168 int do_rarp = ic_proto_have_if & IC_RARP; 1169 1170 /* 1171 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1172 * This routine gets only called when some pieces of information 1173 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1174 */ 1175 if (!ic_proto_enabled) { 1176 pr_err("IP-Config: Incomplete network configuration information\n"); 1177 return -1; 1178 } 1179 1180 #ifdef IPCONFIG_BOOTP 1181 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1182 pr_err("DHCP/BOOTP: No suitable device found\n"); 1183 #endif 1184 #ifdef IPCONFIG_RARP 1185 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1186 pr_err("RARP: No suitable device found\n"); 1187 #endif 1188 1189 if (!ic_proto_have_if) 1190 /* Error message already printed */ 1191 return -1; 1192 1193 /* 1194 * Setup protocols 1195 */ 1196 #ifdef IPCONFIG_BOOTP 1197 if (do_bootp) 1198 ic_bootp_init(); 1199 #endif 1200 #ifdef IPCONFIG_RARP 1201 if (do_rarp) 1202 ic_rarp_init(); 1203 #endif 1204 1205 /* 1206 * Send requests and wait, until we get an answer. This loop 1207 * seems to be a terrible waste of CPU time, but actually there is 1208 * only one process running at all, so we don't need to use any 1209 * scheduler functions. 1210 * [Actually we could now, but the nothing else running note still 1211 * applies.. - AC] 1212 */ 1213 pr_notice("Sending %s%s%s requests .", 1214 do_bootp 1215 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1216 (do_bootp && do_rarp) ? " and " : "", 1217 do_rarp ? "RARP" : ""); 1218 1219 start_jiffies = jiffies; 1220 d = ic_first_dev; 1221 retries = CONF_SEND_RETRIES; 1222 get_random_bytes(&timeout, sizeof(timeout)); 1223 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); 1224 for (;;) { 1225 #ifdef IPCONFIG_BOOTP 1226 /* Track the device we are configuring */ 1227 ic_dev_xid = d->xid; 1228 1229 if (do_bootp && (d->able & IC_BOOTP)) 1230 ic_bootp_send_if(d, jiffies - start_jiffies); 1231 #endif 1232 #ifdef IPCONFIG_RARP 1233 if (do_rarp && (d->able & IC_RARP)) 1234 ic_rarp_send_if(d); 1235 #endif 1236 1237 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1238 while (time_before(jiffies, jiff) && !ic_got_reply) 1239 schedule_timeout_uninterruptible(1); 1240 #ifdef IPCONFIG_DHCP 1241 /* DHCP isn't done until we get a DHCPACK. */ 1242 if ((ic_got_reply & IC_BOOTP) && 1243 (ic_proto_enabled & IC_USE_DHCP) && 1244 ic_dhcp_msgtype != DHCPACK) { 1245 ic_got_reply = 0; 1246 pr_cont(","); 1247 continue; 1248 } 1249 #endif /* IPCONFIG_DHCP */ 1250 1251 if (ic_got_reply) { 1252 pr_cont(" OK\n"); 1253 break; 1254 } 1255 1256 if ((d = d->next)) 1257 continue; 1258 1259 if (! --retries) { 1260 pr_cont(" timed out!\n"); 1261 break; 1262 } 1263 1264 d = ic_first_dev; 1265 1266 timeout = timeout CONF_TIMEOUT_MULT; 1267 if (timeout > CONF_TIMEOUT_MAX) 1268 timeout = CONF_TIMEOUT_MAX; 1269 1270 pr_cont("."); 1271 } 1272 1273 #ifdef IPCONFIG_BOOTP 1274 if (do_bootp) 1275 ic_bootp_cleanup(); 1276 #endif 1277 #ifdef IPCONFIG_RARP 1278 if (do_rarp) 1279 ic_rarp_cleanup(); 1280 #endif 1281 1282 if (!ic_got_reply) { 1283 ic_myaddr = NONE; 1284 return -1; 1285 } 1286 1287 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n", 1288 ((ic_got_reply & IC_RARP) ? "RARP" 1289 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1290 &ic_addrservaddr, &ic_myaddr); 1291 1292 return 0; 1293 } 1294 1295 #endif /* IPCONFIG_DYNAMIC */ 1296 1297 #ifdef CONFIG_PROC_FS 1298 1299 static int pnp_seq_show(struct seq_file *seq, void *v) 1300 { 1301 int i; 1302 1303 if (ic_proto_used & IC_PROTO) 1304 seq_printf(seq, "#PROTO: %s\n", 1305 (ic_proto_used & IC_RARP) ? "RARP" 1306 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1307 else 1308 seq_puts(seq, "#MANUAL\n"); 1309 1310 if (ic_domain[0]) 1311 seq_printf(seq, 1312 "domain %s\n", ic_domain); 1313 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1314 if (ic_nameservers[i] != NONE) 1315 seq_printf(seq, "nameserver %pI4\n", 1316 &ic_nameservers[i]); 1317 } 1318 if (ic_servaddr != NONE) 1319 seq_printf(seq, "bootserver %pI4\n", 1320 &ic_servaddr); 1321 return 0; 1322 } 1323 1324 static int pnp_seq_open(struct inode *indoe, struct file *file) 1325 { 1326 return single_open(file, pnp_seq_show, NULL); 1327 } 1328 1329 static const struct file_operations pnp_seq_fops = { 1330 .owner = THIS_MODULE, 1331 .open = pnp_seq_open, 1332 .read = seq_read, 1333 .llseek = seq_lseek, 1334 .release = single_release, 1335 }; 1336 #endif /* CONFIG_PROC_FS */ 1337 1338 /* 1339 * Extract IP address from the parameter string if needed. Note that we 1340 * need to have root_server_addr set _before_ IPConfig gets called as it 1341 * can override it. 1342 */ 1343 __be32 __init root_nfs_parse_addr(char *name) 1344 { 1345 __be32 addr; 1346 int octets = 0; 1347 char *cp, *cq; 1348 1349 cp = cq = name; 1350 while (octets < 4) { 1351 while (*cp >= '0' && *cp <= '9') 1352 cp++; 1353 if (cp == cq || cp - cq > 3) 1354 break; 1355 if (*cp == '.' || octets == 3) 1356 octets++; 1357 if (octets < 4) 1358 cp++; 1359 cq = cp; 1360 } 1361 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1362 if (*cp == ':') 1363 *cp++ = '\0'; 1364 addr = in_aton(name); 1365 memmove(name, cp, strlen(cp) + 1); 1366 } else 1367 addr = NONE; 1368 1369 return addr; 1370 } 1371 1372 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1373 1374 static int __init wait_for_devices(void) 1375 { 1376 int i; 1377 1378 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1379 struct net_device *dev; 1380 int found = 0; 1381 1382 rtnl_lock(); 1383 for_each_netdev(&init_net, dev) { 1384 if (ic_is_init_dev(dev)) { 1385 found = 1; 1386 break; 1387 } 1388 } 1389 rtnl_unlock(); 1390 if (found) 1391 return 0; 1392 ssleep(1); 1393 } 1394 return -ENODEV; 1395 } 1396 1397 /* 1398 * IP Autoconfig dispatcher. 1399 */ 1400 1401 static int __init ip_auto_config(void) 1402 { 1403 __be32 addr; 1404 #ifdef IPCONFIG_DYNAMIC 1405 int retries = CONF_OPEN_RETRIES; 1406 #endif 1407 int err; 1408 unsigned int i; 1409 1410 #ifdef CONFIG_PROC_FS 1411 proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops); 1412 #endif /* CONFIG_PROC_FS */ 1413 1414 if (!ic_enable) 1415 return 0; 1416 1417 pr_debug("IP-Config: Entered.\n"); 1418 #ifdef IPCONFIG_DYNAMIC 1419 try_try_again: 1420 #endif 1421 /* Wait for devices to appear */ 1422 err = wait_for_devices(); 1423 if (err) 1424 return err; 1425 1426 /* Setup all network devices */ 1427 err = ic_open_devs(); 1428 if (err) 1429 return err; 1430 1431 /* Give drivers a chance to settle */ 1432 msleep(CONF_POST_OPEN); 1433 1434 /* 1435 * If the config information is insufficient (e.g., our IP address or 1436 * IP address of the boot server is missing or we have multiple network 1437 * interfaces and no default was set), use BOOTP or RARP to get the 1438 * missing values. 1439 */ 1440 if (ic_myaddr == NONE || 1441 #ifdef CONFIG_ROOT_NFS 1442 (root_server_addr == NONE && 1443 ic_servaddr == NONE && 1444 ROOT_DEV == Root_NFS) || 1445 #endif 1446 ic_first_dev->next) { 1447 #ifdef IPCONFIG_DYNAMIC 1448 if (ic_dynamic() < 0) { 1449 ic_close_devs(); 1450 1451 /* 1452 * I don't know why, but sometimes the 1453 * eepro100 driver (at least) gets upset and 1454 * doesn't work the first time it's opened. 1455 * But then if you close it and reopen it, it 1456 * works just fine. So we need to try that at 1457 * least once before giving up. 1458 * 1459 * Also, if the root will be NFS-mounted, we 1460 * have nowhere to go if DHCP fails. So we 1461 * just have to keep trying forever. 1462 * 1463 * -- Chip 1464 */ 1465 #ifdef CONFIG_ROOT_NFS 1466 if (ROOT_DEV == Root_NFS) { 1467 pr_err("IP-Config: Retrying forever (NFS root)...\n"); 1468 goto try_try_again; 1469 } 1470 #endif 1471 1472 if (--retries) { 1473 pr_err("IP-Config: Reopening network devices...\n"); 1474 goto try_try_again; 1475 } 1476 1477 /* Oh, well. At least we tried. */ 1478 pr_err("IP-Config: Auto-configuration of network failed\n"); 1479 return -1; 1480 } 1481 #else /* !DYNAMIC */ 1482 pr_err("IP-Config: Incomplete network configuration information\n"); 1483 ic_close_devs(); 1484 return -1; 1485 #endif /* IPCONFIG_DYNAMIC */ 1486 } else { 1487 /* Device selected manually or only one device -> use it */ 1488 ic_dev = ic_first_dev->dev; 1489 } 1490 1491 addr = root_nfs_parse_addr(root_server_path); 1492 if (root_server_addr == NONE) 1493 root_server_addr = addr; 1494 1495 /* 1496 * Use defaults wherever applicable. 1497 */ 1498 if (ic_defaults() < 0) 1499 return -1; 1500 1501 /* 1502 * Close all network devices except the device we've 1503 * autoconfigured and set up routes. 1504 */ 1505 ic_close_devs(); 1506 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1507 return -1; 1508 1509 /* 1510 * Record which protocol was actually used. 1511 */ 1512 #ifdef IPCONFIG_DYNAMIC 1513 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1514 #endif 1515 1516 #ifndef IPCONFIG_SILENT 1517 /* 1518 * Clue in the operator. 1519 */ 1520 pr_info("IP-Config: Complete:\n"); 1521 1522 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", 1523 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr, 1524 &ic_myaddr, &ic_netmask, &ic_gateway); 1525 pr_info(" host=%s, domain=%s, nis-domain=%s\n", 1526 utsname()->nodename, ic_domain, utsname()->domainname); 1527 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", 1528 &ic_servaddr, &root_server_addr, root_server_path); 1529 if (ic_dev_mtu) 1530 pr_cont(", mtu=%d", ic_dev_mtu); 1531 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 1532 if (ic_nameservers[i] != NONE) { 1533 pr_cont(" nameserver%u=%pI4", 1534 i, &ic_nameservers[i]); 1535 break; 1536 } 1537 for (i++; i < CONF_NAMESERVERS_MAX; i++) 1538 if (ic_nameservers[i] != NONE) 1539 pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]); 1540 pr_cont("\n"); 1541 #endif /* !SILENT */ 1542 1543 return 0; 1544 } 1545 1546 late_initcall(ip_auto_config); 1547 1548 1549 /* 1550 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1551 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. 1552 */ 1553 static int __init ic_proto_name(char *name) 1554 { 1555 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1556 return 1; 1557 } 1558 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1559 return 0; 1560 } 1561 #ifdef CONFIG_IP_PNP_DHCP 1562 else if (!strncmp(name, "dhcp", 4)) { 1563 char *client_id; 1564 1565 ic_proto_enabled &= ~IC_RARP; 1566 client_id = strstr(name, "dhcp,"); 1567 if (client_id) { 1568 char *v; 1569 1570 client_id = client_id + 5; 1571 v = strchr(client_id, ','); 1572 if (!v) 1573 return 1; 1574 *v = 0; 1575 if (kstrtou8(client_id, 0, dhcp_client_identifier)) 1576 pr_debug("DHCP: Invalid client identifier type\n"); 1577 strncpy(dhcp_client_identifier + 1, v + 1, 251); 1578 *v = ','; 1579 } 1580 return 1; 1581 } 1582 #endif 1583 #ifdef CONFIG_IP_PNP_BOOTP 1584 else if (!strcmp(name, "bootp")) { 1585 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1586 return 1; 1587 } 1588 #endif 1589 #ifdef CONFIG_IP_PNP_RARP 1590 else if (!strcmp(name, "rarp")) { 1591 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1592 return 1; 1593 } 1594 #endif 1595 #ifdef IPCONFIG_DYNAMIC 1596 else if (!strcmp(name, "both")) { 1597 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1598 return 1; 1599 } 1600 #endif 1601 return 0; 1602 } 1603 1604 static int __init ip_auto_config_setup(char *addrs) 1605 { 1606 char *cp, *ip, *dp; 1607 int num = 0; 1608 1609 ic_set_manually = 1; 1610 ic_enable = 1; 1611 1612 /* 1613 * If any dhcp, bootp etc options are set, leave autoconfig on 1614 * and skip the below static IP processing. 1615 */ 1616 if (ic_proto_name(addrs)) 1617 return 1; 1618 1619 /* If no static IP is given, turn off autoconfig and bail. */ 1620 if (*addrs == 0 || 1621 strcmp(addrs, "off") == 0 || 1622 strcmp(addrs, "none") == 0) { 1623 ic_enable = 0; 1624 return 1; 1625 } 1626 1627 ic_nameservers_predef(); 1628 1629 /* Parse string for static IP assignment. */ 1630 ip = addrs; 1631 while (ip && *ip) { 1632 if ((cp = strchr(ip, ':'))) 1633 *cp++ = '\0'; 1634 if (strlen(ip) > 0) { 1635 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip); 1636 switch (num) { 1637 case 0: 1638 if ((ic_myaddr = in_aton(ip)) == ANY) 1639 ic_myaddr = NONE; 1640 break; 1641 case 1: 1642 if ((ic_servaddr = in_aton(ip)) == ANY) 1643 ic_servaddr = NONE; 1644 break; 1645 case 2: 1646 if ((ic_gateway = in_aton(ip)) == ANY) 1647 ic_gateway = NONE; 1648 break; 1649 case 3: 1650 if ((ic_netmask = in_aton(ip)) == ANY) 1651 ic_netmask = NONE; 1652 break; 1653 case 4: 1654 if ((dp = strchr(ip, '.'))) { 1655 *dp++ = '\0'; 1656 strlcpy(utsname()->domainname, dp, 1657 sizeof(utsname()->domainname)); 1658 } 1659 strlcpy(utsname()->nodename, ip, 1660 sizeof(utsname()->nodename)); 1661 ic_host_name_set = 1; 1662 break; 1663 case 5: 1664 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1665 break; 1666 case 6: 1667 if (ic_proto_name(ip) == 0 && 1668 ic_myaddr == NONE) { 1669 ic_enable = 0; 1670 } 1671 break; 1672 case 7: 1673 if (CONF_NAMESERVERS_MAX >= 1) { 1674 ic_nameservers[0] = in_aton(ip); 1675 if (ic_nameservers[0] == ANY) 1676 ic_nameservers[0] = NONE; 1677 } 1678 break; 1679 case 8: 1680 if (CONF_NAMESERVERS_MAX >= 2) { 1681 ic_nameservers[1] = in_aton(ip); 1682 if (ic_nameservers[1] == ANY) 1683 ic_nameservers[1] = NONE; 1684 } 1685 break; 1686 } 1687 } 1688 ip = cp; 1689 num++; 1690 } 1691 1692 return 1; 1693 } 1694 __setup("ip=", ip_auto_config_setup); 1695 1696 static int __init nfsaddrs_config_setup(char *addrs) 1697 { 1698 return ip_auto_config_setup(addrs); 1699 } 1700 __setup("nfsaddrs=", nfsaddrs_config_setup); 1701 1702 static int __init vendor_class_identifier_setup(char *addrs) 1703 { 1704 if (strlcpy(vendor_class_identifier, addrs, 1705 sizeof(vendor_class_identifier)) 1706 >= sizeof(vendor_class_identifier)) 1707 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n", 1708 vendor_class_identifier); 1709 return 1; 1710 } 1711 __setup("dhcpclass=", vendor_class_identifier_setup); 1712