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 #ifdef IPCONFIG_DYNAMIC 131 static __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */ 132 #endif 133 134 __be32 ic_servaddr = NONE; /* Boot server IP address */ 135 136 __be32 root_server_addr = NONE; /* Address of NFS server */ 137 u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 138 139 /* vendor class identifier */ 140 static char vendor_class_identifier[253] __initdata; 141 142 #if defined(CONFIG_IP_PNP_DHCP) 143 static char dhcp_client_identifier[253] __initdata; 144 #endif 145 146 /* Persistent data: */ 147 148 #ifdef IPCONFIG_DYNAMIC 149 static int ic_proto_used; /* Protocol used, if any */ 150 #else 151 #define ic_proto_used 0 152 #endif 153 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 154 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 155 156 /* 157 * Private state. 158 */ 159 160 /* Name of user-selected boot device */ 161 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 162 163 /* Protocols supported by available interfaces */ 164 static int ic_proto_have_if __initdata; 165 166 /* MTU for boot device */ 167 static int ic_dev_mtu __initdata; 168 169 #ifdef IPCONFIG_DYNAMIC 170 static DEFINE_SPINLOCK(ic_recv_lock); 171 static volatile int ic_got_reply __initdata; /* Proto(s) that replied */ 172 #endif 173 #ifdef IPCONFIG_DHCP 174 static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */ 175 #endif 176 177 178 /* 179 * Network devices 180 */ 181 182 struct ic_device { 183 struct ic_device *next; 184 struct net_device *dev; 185 unsigned short flags; 186 short able; 187 __be32 xid; 188 }; 189 190 static struct ic_device *ic_first_dev __initdata; /* List of open device */ 191 static struct net_device *ic_dev __initdata; /* Selected device */ 192 193 static bool __init ic_is_init_dev(struct net_device *dev) 194 { 195 if (dev->flags & IFF_LOOPBACK) 196 return false; 197 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 198 (!(dev->flags & IFF_LOOPBACK) && 199 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 200 strncmp(dev->name, "dummy", 5)); 201 } 202 203 static int __init ic_open_devs(void) 204 { 205 struct ic_device *d, **last; 206 struct net_device *dev; 207 unsigned short oflags; 208 unsigned long start, next_msg; 209 210 last = &ic_first_dev; 211 rtnl_lock(); 212 213 /* bring loopback and DSA master network devices up first */ 214 for_each_netdev(&init_net, dev) { 215 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev)) 216 continue; 217 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) 218 pr_err("IP-Config: Failed to open %s\n", dev->name); 219 } 220 221 for_each_netdev(&init_net, dev) { 222 if (ic_is_init_dev(dev)) { 223 int able = 0; 224 if (dev->mtu >= 364) 225 able |= IC_BOOTP; 226 else 227 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n", 228 dev->name, dev->mtu); 229 if (!(dev->flags & IFF_NOARP)) 230 able |= IC_RARP; 231 able &= ic_proto_enabled; 232 if (ic_proto_enabled && !able) 233 continue; 234 oflags = dev->flags; 235 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 236 pr_err("IP-Config: Failed to open %s\n", 237 dev->name); 238 continue; 239 } 240 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 241 rtnl_unlock(); 242 return -ENOMEM; 243 } 244 d->dev = dev; 245 *last = d; 246 last = &d->next; 247 d->flags = oflags; 248 d->able = able; 249 if (able & IC_BOOTP) 250 get_random_bytes(&d->xid, sizeof(__be32)); 251 else 252 d->xid = 0; 253 ic_proto_have_if |= able; 254 pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n", 255 dev->name, able, d->xid); 256 } 257 } 258 259 /* no point in waiting if we could not bring up at least one device */ 260 if (!ic_first_dev) 261 goto have_carrier; 262 263 /* wait for a carrier on at least one device */ 264 start = jiffies; 265 next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12); 266 while (time_before(jiffies, start + 267 msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) { 268 int wait, elapsed; 269 270 for_each_netdev(&init_net, dev) 271 if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) 272 goto have_carrier; 273 274 msleep(1); 275 276 if (time_before(jiffies, next_msg)) 277 continue; 278 279 elapsed = jiffies_to_msecs(jiffies - start); 280 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000; 281 pr_info("Waiting up to %d more seconds for network.\n", wait); 282 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12); 283 } 284 have_carrier: 285 rtnl_unlock(); 286 287 *last = NULL; 288 289 if (!ic_first_dev) { 290 if (user_dev_name[0]) 291 pr_err("IP-Config: Device `%s' not found\n", 292 user_dev_name); 293 else 294 pr_err("IP-Config: No network devices available\n"); 295 return -ENODEV; 296 } 297 return 0; 298 } 299 300 static void __init ic_close_devs(void) 301 { 302 struct ic_device *d, *next; 303 struct net_device *dev; 304 305 rtnl_lock(); 306 next = ic_first_dev; 307 while ((d = next)) { 308 next = d->next; 309 dev = d->dev; 310 if (dev != ic_dev && !netdev_uses_dsa(dev)) { 311 pr_debug("IP-Config: Downing %s\n", dev->name); 312 dev_change_flags(dev, d->flags); 313 } 314 kfree(d); 315 } 316 rtnl_unlock(); 317 } 318 319 /* 320 * Interface to various network functions. 321 */ 322 323 static inline void 324 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 325 { 326 sin->sin_family = AF_INET; 327 sin->sin_addr.s_addr = addr; 328 sin->sin_port = port; 329 } 330 331 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg) 332 { 333 int res; 334 335 mm_segment_t oldfs = get_fs(); 336 set_fs(get_ds()); 337 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 338 set_fs(oldfs); 339 return res; 340 } 341 342 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 343 { 344 int res; 345 346 mm_segment_t oldfs = get_fs(); 347 set_fs(get_ds()); 348 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 349 set_fs(oldfs); 350 return res; 351 } 352 353 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 354 { 355 int res; 356 357 mm_segment_t oldfs = get_fs(); 358 set_fs(get_ds()); 359 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); 360 set_fs(oldfs); 361 return res; 362 } 363 364 /* 365 * Set up interface addresses and routes. 366 */ 367 368 static int __init ic_setup_if(void) 369 { 370 struct ifreq ir; 371 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 372 int err; 373 374 memset(&ir, 0, sizeof(ir)); 375 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); 376 set_sockaddr(sin, ic_myaddr, 0); 377 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) { 378 pr_err("IP-Config: Unable to set interface address (%d)\n", 379 err); 380 return -1; 381 } 382 set_sockaddr(sin, ic_netmask, 0); 383 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 384 pr_err("IP-Config: Unable to set interface netmask (%d)\n", 385 err); 386 return -1; 387 } 388 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 389 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 390 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n", 391 err); 392 return -1; 393 } 394 /* Handle the case where we need non-standard MTU on the boot link (a network 395 * using jumbo frames, for instance). If we can't set the mtu, don't error 396 * out, we'll try to muddle along. 397 */ 398 if (ic_dev_mtu != 0) { 399 strcpy(ir.ifr_name, ic_dev->name); 400 ir.ifr_mtu = ic_dev_mtu; 401 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0) 402 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", 403 ic_dev_mtu, err); 404 } 405 return 0; 406 } 407 408 static int __init ic_setup_routes(void) 409 { 410 /* No need to setup device routes, only the default route... */ 411 412 if (ic_gateway != NONE) { 413 struct rtentry rm; 414 int err; 415 416 memset(&rm, 0, sizeof(rm)); 417 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 418 pr_err("IP-Config: Gateway not on directly connected network\n"); 419 return -1; 420 } 421 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 422 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 423 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 424 rm.rt_flags = RTF_UP | RTF_GATEWAY; 425 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 426 pr_err("IP-Config: Cannot add default route (%d)\n", 427 err); 428 return -1; 429 } 430 } 431 432 return 0; 433 } 434 435 /* 436 * Fill in default values for all missing parameters. 437 */ 438 439 static int __init ic_defaults(void) 440 { 441 /* 442 * At this point we have no userspace running so need not 443 * claim locks on system_utsname 444 */ 445 446 if (!ic_host_name_set) 447 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 448 449 if (root_server_addr == NONE) 450 root_server_addr = ic_servaddr; 451 452 if (ic_netmask == NONE) { 453 if (IN_CLASSA(ntohl(ic_myaddr))) 454 ic_netmask = htonl(IN_CLASSA_NET); 455 else if (IN_CLASSB(ntohl(ic_myaddr))) 456 ic_netmask = htonl(IN_CLASSB_NET); 457 else if (IN_CLASSC(ntohl(ic_myaddr))) 458 ic_netmask = htonl(IN_CLASSC_NET); 459 else { 460 pr_err("IP-Config: Unable to guess netmask for address %pI4\n", 461 &ic_myaddr); 462 return -1; 463 } 464 pr_notice("IP-Config: Guessing netmask %pI4\n", 465 &ic_netmask); 466 } 467 468 return 0; 469 } 470 471 /* 472 * RARP support. 473 */ 474 475 #ifdef IPCONFIG_RARP 476 477 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 478 479 static struct packet_type rarp_packet_type __initdata = { 480 .type = cpu_to_be16(ETH_P_RARP), 481 .func = ic_rarp_recv, 482 }; 483 484 static inline void __init ic_rarp_init(void) 485 { 486 dev_add_pack(&rarp_packet_type); 487 } 488 489 static inline void __init ic_rarp_cleanup(void) 490 { 491 dev_remove_pack(&rarp_packet_type); 492 } 493 494 /* 495 * Process received RARP packet. 496 */ 497 static int __init 498 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 499 { 500 struct arphdr *rarp; 501 unsigned char *rarp_ptr; 502 __be32 sip, tip; 503 unsigned char *tha; /* t for "target" */ 504 struct ic_device *d; 505 506 if (!net_eq(dev_net(dev), &init_net)) 507 goto drop; 508 509 skb = skb_share_check(skb, GFP_ATOMIC); 510 if (!skb) 511 return NET_RX_DROP; 512 513 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 514 goto drop; 515 516 /* Basic sanity checks can be done without the lock. */ 517 rarp = (struct arphdr *)skb_transport_header(skb); 518 519 /* If this test doesn't pass, it's not IP, or we should 520 * ignore it anyway. 521 */ 522 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 523 goto drop; 524 525 /* If it's not a RARP reply, delete it. */ 526 if (rarp->ar_op != htons(ARPOP_RREPLY)) 527 goto drop; 528 529 /* If it's not Ethernet, delete it. */ 530 if (rarp->ar_pro != htons(ETH_P_IP)) 531 goto drop; 532 533 if (!pskb_may_pull(skb, arp_hdr_len(dev))) 534 goto drop; 535 536 /* OK, it is all there and looks valid, process... */ 537 rarp = (struct arphdr *)skb_transport_header(skb); 538 rarp_ptr = (unsigned char *) (rarp + 1); 539 540 /* One reply at a time, please. */ 541 spin_lock(&ic_recv_lock); 542 543 /* If we already have a reply, just drop the packet */ 544 if (ic_got_reply) 545 goto drop_unlock; 546 547 /* Find the ic_device that the packet arrived on */ 548 d = ic_first_dev; 549 while (d && d->dev != dev) 550 d = d->next; 551 if (!d) 552 goto drop_unlock; /* should never happen */ 553 554 /* Extract variable-width fields */ 555 rarp_ptr += dev->addr_len; 556 memcpy(&sip, rarp_ptr, 4); 557 rarp_ptr += 4; 558 tha = rarp_ptr; 559 rarp_ptr += dev->addr_len; 560 memcpy(&tip, rarp_ptr, 4); 561 562 /* Discard packets which are not meant for us. */ 563 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 564 goto drop_unlock; 565 566 /* Discard packets which are not from specified server. */ 567 if (ic_servaddr != NONE && ic_servaddr != sip) 568 goto drop_unlock; 569 570 /* We have a winner! */ 571 ic_dev = dev; 572 if (ic_myaddr == NONE) 573 ic_myaddr = tip; 574 ic_servaddr = sip; 575 ic_addrservaddr = sip; 576 ic_got_reply = IC_RARP; 577 578 drop_unlock: 579 /* Show's over. Nothing to see here. */ 580 spin_unlock(&ic_recv_lock); 581 582 drop: 583 /* Throw the packet out. */ 584 kfree_skb(skb); 585 return 0; 586 } 587 588 589 /* 590 * Send RARP request packet over a single interface. 591 */ 592 static void __init ic_rarp_send_if(struct ic_device *d) 593 { 594 struct net_device *dev = d->dev; 595 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 596 dev->dev_addr, dev->dev_addr); 597 } 598 #endif 599 600 /* 601 * Predefine Nameservers 602 */ 603 static inline void __init ic_nameservers_predef(void) 604 { 605 int i; 606 607 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 608 ic_nameservers[i] = NONE; 609 } 610 611 /* 612 * DHCP/BOOTP support. 613 */ 614 615 #ifdef IPCONFIG_BOOTP 616 617 struct bootp_pkt { /* BOOTP packet format */ 618 struct iphdr iph; /* IP header */ 619 struct udphdr udph; /* UDP header */ 620 u8 op; /* 1=request, 2=reply */ 621 u8 htype; /* HW address type */ 622 u8 hlen; /* HW address length */ 623 u8 hops; /* Used only by gateways */ 624 __be32 xid; /* Transaction ID */ 625 __be16 secs; /* Seconds since we started */ 626 __be16 flags; /* Just what it says */ 627 __be32 client_ip; /* Client's IP address if known */ 628 __be32 your_ip; /* Assigned IP address */ 629 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 630 __be32 relay_ip; /* IP address of BOOTP relay */ 631 u8 hw_addr[16]; /* Client's HW address */ 632 u8 serv_name[64]; /* Server host name */ 633 u8 boot_file[128]; /* Name of boot file */ 634 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 635 }; 636 637 /* packet ops */ 638 #define BOOTP_REQUEST 1 639 #define BOOTP_REPLY 2 640 641 /* DHCP message types */ 642 #define DHCPDISCOVER 1 643 #define DHCPOFFER 2 644 #define DHCPREQUEST 3 645 #define DHCPDECLINE 4 646 #define DHCPACK 5 647 #define DHCPNAK 6 648 #define DHCPRELEASE 7 649 #define DHCPINFORM 8 650 651 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 652 653 static struct packet_type bootp_packet_type __initdata = { 654 .type = cpu_to_be16(ETH_P_IP), 655 .func = ic_bootp_recv, 656 }; 657 658 static __be32 ic_dev_xid; /* Device under configuration */ 659 660 /* 661 * Initialize DHCP/BOOTP extension fields in the request. 662 */ 663 664 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 665 666 #ifdef IPCONFIG_DHCP 667 668 static void __init 669 ic_dhcp_init_options(u8 *options) 670 { 671 u8 mt = ((ic_servaddr == NONE) 672 ? DHCPDISCOVER : DHCPREQUEST); 673 u8 *e = options; 674 int len; 675 676 pr_debug("DHCP: Sending message type %d\n", mt); 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 len = strlen(dhcp_client_identifier + 1); 732 /* the minimum length of identifier is 2, include 1 byte type, 733 * and can not be larger than the length of options 734 */ 735 if (len >= 1 && len < 312 - (e - options) - 1) { 736 *e++ = 61; 737 *e++ = len + 1; 738 memcpy(e, dhcp_client_identifier, len + 1); 739 e += len + 1; 740 } 741 } 742 743 *e++ = 255; /* End of the list */ 744 } 745 746 #endif /* IPCONFIG_DHCP */ 747 748 static void __init ic_bootp_init_ext(u8 *e) 749 { 750 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 751 e += 4; 752 *e++ = 1; /* Subnet mask request */ 753 *e++ = 4; 754 e += 4; 755 *e++ = 3; /* Default gateway request */ 756 *e++ = 4; 757 e += 4; 758 *e++ = 5; /* Name server request */ 759 *e++ = 8; 760 e += 8; 761 *e++ = 12; /* Host name request */ 762 *e++ = 32; 763 e += 32; 764 *e++ = 40; /* NIS Domain name request */ 765 *e++ = 32; 766 e += 32; 767 *e++ = 17; /* Boot path */ 768 *e++ = 40; 769 e += 40; 770 771 *e++ = 57; /* set extension buffer size for reply */ 772 *e++ = 2; 773 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 774 *e++ = 150; 775 776 *e++ = 255; /* End of the list */ 777 } 778 779 780 /* 781 * Initialize the DHCP/BOOTP mechanism. 782 */ 783 static inline void __init ic_bootp_init(void) 784 { 785 ic_nameservers_predef(); 786 787 dev_add_pack(&bootp_packet_type); 788 } 789 790 791 /* 792 * DHCP/BOOTP cleanup. 793 */ 794 static inline void __init ic_bootp_cleanup(void) 795 { 796 dev_remove_pack(&bootp_packet_type); 797 } 798 799 800 /* 801 * Send DHCP/BOOTP request to single interface. 802 */ 803 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 804 { 805 struct net_device *dev = d->dev; 806 struct sk_buff *skb; 807 struct bootp_pkt *b; 808 struct iphdr *h; 809 int hlen = LL_RESERVED_SPACE(dev); 810 int tlen = dev->needed_tailroom; 811 812 /* Allocate packet */ 813 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, 814 GFP_KERNEL); 815 if (!skb) 816 return; 817 skb_reserve(skb, hlen); 818 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 819 memset(b, 0, sizeof(struct bootp_pkt)); 820 821 /* Construct IP header */ 822 skb_reset_network_header(skb); 823 h = ip_hdr(skb); 824 h->version = 4; 825 h->ihl = 5; 826 h->tot_len = htons(sizeof(struct bootp_pkt)); 827 h->frag_off = htons(IP_DF); 828 h->ttl = 64; 829 h->protocol = IPPROTO_UDP; 830 h->daddr = htonl(INADDR_BROADCAST); 831 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 832 833 /* Construct UDP header */ 834 b->udph.source = htons(68); 835 b->udph.dest = htons(67); 836 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 837 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 838 839 /* Construct DHCP/BOOTP header */ 840 b->op = BOOTP_REQUEST; 841 if (dev->type < 256) /* check for false types */ 842 b->htype = dev->type; 843 else if (dev->type == ARPHRD_FDDI) 844 b->htype = ARPHRD_ETHER; 845 else { 846 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type, 847 dev->name); 848 b->htype = dev->type; /* can cause undefined behavior */ 849 } 850 851 /* server_ip and your_ip address are both already zero per RFC2131 */ 852 b->hlen = dev->addr_len; 853 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 854 b->secs = htons(jiffies_diff / HZ); 855 b->xid = d->xid; 856 857 /* add DHCP options or BOOTP extensions */ 858 #ifdef IPCONFIG_DHCP 859 if (ic_proto_enabled & IC_USE_DHCP) 860 ic_dhcp_init_options(b->exten); 861 else 862 #endif 863 ic_bootp_init_ext(b->exten); 864 865 /* Chain packet down the line... */ 866 skb->dev = dev; 867 skb->protocol = htons(ETH_P_IP); 868 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 869 dev->broadcast, dev->dev_addr, skb->len) < 0) { 870 kfree_skb(skb); 871 printk("E"); 872 return; 873 } 874 875 if (dev_queue_xmit(skb) < 0) 876 printk("E"); 877 } 878 879 880 /* 881 * Copy BOOTP-supplied string if not already set. 882 */ 883 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 884 { 885 if (!len) 886 return 0; 887 if (len > max-1) 888 len = max-1; 889 memcpy(dest, src, len); 890 dest[len] = '\0'; 891 return 1; 892 } 893 894 895 /* 896 * Process BOOTP extensions. 897 */ 898 static void __init ic_do_bootp_ext(u8 *ext) 899 { 900 u8 servers; 901 int i; 902 __be16 mtu; 903 904 u8 *c; 905 906 pr_debug("DHCP/BOOTP: Got extension %d:", *ext); 907 for (c=ext+2; c<ext+2+ext[1]; c++) 908 pr_debug(" %02x", *c); 909 pr_debug("\n"); 910 911 switch (*ext++) { 912 case 1: /* Subnet mask */ 913 if (ic_netmask == NONE) 914 memcpy(&ic_netmask, ext+1, 4); 915 break; 916 case 3: /* Default gateway */ 917 if (ic_gateway == NONE) 918 memcpy(&ic_gateway, ext+1, 4); 919 break; 920 case 6: /* DNS server */ 921 servers= *ext/4; 922 if (servers > CONF_NAMESERVERS_MAX) 923 servers = CONF_NAMESERVERS_MAX; 924 for (i = 0; i < servers; i++) { 925 if (ic_nameservers[i] == NONE) 926 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 927 } 928 break; 929 case 12: /* Host name */ 930 ic_bootp_string(utsname()->nodename, ext+1, *ext, 931 __NEW_UTS_LEN); 932 ic_host_name_set = 1; 933 break; 934 case 15: /* Domain name (DNS) */ 935 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 936 break; 937 case 17: /* Root path */ 938 if (!root_server_path[0]) 939 ic_bootp_string(root_server_path, ext+1, *ext, 940 sizeof(root_server_path)); 941 break; 942 case 26: /* Interface MTU */ 943 memcpy(&mtu, ext+1, sizeof(mtu)); 944 ic_dev_mtu = ntohs(mtu); 945 break; 946 case 40: /* NIS Domain name (_not_ DNS) */ 947 ic_bootp_string(utsname()->domainname, ext+1, *ext, 948 __NEW_UTS_LEN); 949 break; 950 } 951 } 952 953 954 /* 955 * Receive BOOTP reply. 956 */ 957 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 958 { 959 struct bootp_pkt *b; 960 struct iphdr *h; 961 struct ic_device *d; 962 int len, ext_len; 963 964 if (!net_eq(dev_net(dev), &init_net)) 965 goto drop; 966 967 /* Perform verifications before taking the lock. */ 968 if (skb->pkt_type == PACKET_OTHERHOST) 969 goto drop; 970 971 skb = skb_share_check(skb, GFP_ATOMIC); 972 if (!skb) 973 return NET_RX_DROP; 974 975 if (!pskb_may_pull(skb, 976 sizeof(struct iphdr) + 977 sizeof(struct udphdr))) 978 goto drop; 979 980 b = (struct bootp_pkt *)skb_network_header(skb); 981 h = &b->iph; 982 983 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 984 goto drop; 985 986 /* Fragments are not supported */ 987 if (ip_is_fragment(h)) { 988 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); 989 goto drop; 990 } 991 992 if (skb->len < ntohs(h->tot_len)) 993 goto drop; 994 995 if (ip_fast_csum((char *) h, h->ihl)) 996 goto drop; 997 998 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 999 goto drop; 1000 1001 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 1002 goto drop; 1003 1004 len = ntohs(b->udph.len) - sizeof(struct udphdr); 1005 ext_len = len - (sizeof(*b) - 1006 sizeof(struct iphdr) - 1007 sizeof(struct udphdr) - 1008 sizeof(b->exten)); 1009 if (ext_len < 0) 1010 goto drop; 1011 1012 /* Ok the front looks good, make sure we can get at the rest. */ 1013 if (!pskb_may_pull(skb, skb->len)) 1014 goto drop; 1015 1016 b = (struct bootp_pkt *)skb_network_header(skb); 1017 h = &b->iph; 1018 1019 /* One reply at a time, please. */ 1020 spin_lock(&ic_recv_lock); 1021 1022 /* If we already have a reply, just drop the packet */ 1023 if (ic_got_reply) 1024 goto drop_unlock; 1025 1026 /* Find the ic_device that the packet arrived on */ 1027 d = ic_first_dev; 1028 while (d && d->dev != dev) 1029 d = d->next; 1030 if (!d) 1031 goto drop_unlock; /* should never happen */ 1032 1033 /* Is it a reply to our BOOTP request? */ 1034 if (b->op != BOOTP_REPLY || 1035 b->xid != d->xid) { 1036 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n", 1037 b->op, b->xid); 1038 goto drop_unlock; 1039 } 1040 1041 /* Is it a reply for the device we are configuring? */ 1042 if (b->xid != ic_dev_xid) { 1043 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n"); 1044 goto drop_unlock; 1045 } 1046 1047 /* Parse extensions */ 1048 if (ext_len >= 4 && 1049 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1050 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1051 u8 *ext; 1052 1053 #ifdef IPCONFIG_DHCP 1054 if (ic_proto_enabled & IC_USE_DHCP) { 1055 __be32 server_id = NONE; 1056 int mt = 0; 1057 1058 ext = &b->exten[4]; 1059 while (ext < end && *ext != 0xff) { 1060 u8 *opt = ext++; 1061 if (*opt == 0) /* Padding */ 1062 continue; 1063 ext += *ext + 1; 1064 if (ext >= end) 1065 break; 1066 switch (*opt) { 1067 case 53: /* Message type */ 1068 if (opt[1]) 1069 mt = opt[2]; 1070 break; 1071 case 54: /* Server ID (IP address) */ 1072 if (opt[1] >= 4) 1073 memcpy(&server_id, opt + 2, 4); 1074 break; 1075 } 1076 } 1077 1078 pr_debug("DHCP: Got message type %d\n", mt); 1079 1080 switch (mt) { 1081 case DHCPOFFER: 1082 /* While in the process of accepting one offer, 1083 * ignore all others. 1084 */ 1085 if (ic_myaddr != NONE) 1086 goto drop_unlock; 1087 1088 /* Let's accept that offer. */ 1089 ic_myaddr = b->your_ip; 1090 ic_servaddr = server_id; 1091 pr_debug("DHCP: Offered address %pI4 by server %pI4\n", 1092 &ic_myaddr, &b->iph.saddr); 1093 /* The DHCP indicated server address takes 1094 * precedence over the bootp header one if 1095 * they are different. 1096 */ 1097 if ((server_id != NONE) && 1098 (b->server_ip != server_id)) 1099 b->server_ip = ic_servaddr; 1100 break; 1101 1102 case DHCPACK: 1103 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1104 goto drop_unlock; 1105 1106 /* Yeah! */ 1107 break; 1108 1109 default: 1110 /* Urque. Forget it*/ 1111 ic_myaddr = NONE; 1112 ic_servaddr = NONE; 1113 goto drop_unlock; 1114 } 1115 1116 ic_dhcp_msgtype = mt; 1117 1118 } 1119 #endif /* IPCONFIG_DHCP */ 1120 1121 ext = &b->exten[4]; 1122 while (ext < end && *ext != 0xff) { 1123 u8 *opt = ext++; 1124 if (*opt == 0) /* Padding */ 1125 continue; 1126 ext += *ext + 1; 1127 if (ext < end) 1128 ic_do_bootp_ext(opt); 1129 } 1130 } 1131 1132 /* We have a winner! */ 1133 ic_dev = dev; 1134 ic_myaddr = b->your_ip; 1135 ic_servaddr = b->server_ip; 1136 ic_addrservaddr = b->iph.saddr; 1137 if (ic_gateway == NONE && b->relay_ip) 1138 ic_gateway = b->relay_ip; 1139 if (ic_nameservers[0] == NONE) 1140 ic_nameservers[0] = ic_servaddr; 1141 ic_got_reply = IC_BOOTP; 1142 1143 drop_unlock: 1144 /* Show's over. Nothing to see here. */ 1145 spin_unlock(&ic_recv_lock); 1146 1147 drop: 1148 /* Throw the packet out. */ 1149 kfree_skb(skb); 1150 1151 return 0; 1152 } 1153 1154 1155 #endif 1156 1157 1158 /* 1159 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1160 */ 1161 1162 #ifdef IPCONFIG_DYNAMIC 1163 1164 static int __init ic_dynamic(void) 1165 { 1166 int retries; 1167 struct ic_device *d; 1168 unsigned long start_jiffies, timeout, jiff; 1169 int do_bootp = ic_proto_have_if & IC_BOOTP; 1170 int do_rarp = ic_proto_have_if & IC_RARP; 1171 1172 /* 1173 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1174 * This routine gets only called when some pieces of information 1175 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1176 */ 1177 if (!ic_proto_enabled) { 1178 pr_err("IP-Config: Incomplete network configuration information\n"); 1179 return -1; 1180 } 1181 1182 #ifdef IPCONFIG_BOOTP 1183 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1184 pr_err("DHCP/BOOTP: No suitable device found\n"); 1185 #endif 1186 #ifdef IPCONFIG_RARP 1187 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1188 pr_err("RARP: No suitable device found\n"); 1189 #endif 1190 1191 if (!ic_proto_have_if) 1192 /* Error message already printed */ 1193 return -1; 1194 1195 /* 1196 * Setup protocols 1197 */ 1198 #ifdef IPCONFIG_BOOTP 1199 if (do_bootp) 1200 ic_bootp_init(); 1201 #endif 1202 #ifdef IPCONFIG_RARP 1203 if (do_rarp) 1204 ic_rarp_init(); 1205 #endif 1206 1207 /* 1208 * Send requests and wait, until we get an answer. This loop 1209 * seems to be a terrible waste of CPU time, but actually there is 1210 * only one process running at all, so we don't need to use any 1211 * scheduler functions. 1212 * [Actually we could now, but the nothing else running note still 1213 * applies.. - AC] 1214 */ 1215 pr_notice("Sending %s%s%s requests .", 1216 do_bootp 1217 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1218 (do_bootp && do_rarp) ? " and " : "", 1219 do_rarp ? "RARP" : ""); 1220 1221 start_jiffies = jiffies; 1222 d = ic_first_dev; 1223 retries = CONF_SEND_RETRIES; 1224 get_random_bytes(&timeout, sizeof(timeout)); 1225 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); 1226 for (;;) { 1227 #ifdef IPCONFIG_BOOTP 1228 /* Track the device we are configuring */ 1229 ic_dev_xid = d->xid; 1230 1231 if (do_bootp && (d->able & IC_BOOTP)) 1232 ic_bootp_send_if(d, jiffies - start_jiffies); 1233 #endif 1234 #ifdef IPCONFIG_RARP 1235 if (do_rarp && (d->able & IC_RARP)) 1236 ic_rarp_send_if(d); 1237 #endif 1238 1239 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1240 while (time_before(jiffies, jiff) && !ic_got_reply) 1241 schedule_timeout_uninterruptible(1); 1242 #ifdef IPCONFIG_DHCP 1243 /* DHCP isn't done until we get a DHCPACK. */ 1244 if ((ic_got_reply & IC_BOOTP) && 1245 (ic_proto_enabled & IC_USE_DHCP) && 1246 ic_dhcp_msgtype != DHCPACK) { 1247 ic_got_reply = 0; 1248 pr_cont(","); 1249 continue; 1250 } 1251 #endif /* IPCONFIG_DHCP */ 1252 1253 if (ic_got_reply) { 1254 pr_cont(" OK\n"); 1255 break; 1256 } 1257 1258 if ((d = d->next)) 1259 continue; 1260 1261 if (! --retries) { 1262 pr_cont(" timed out!\n"); 1263 break; 1264 } 1265 1266 d = ic_first_dev; 1267 1268 timeout = timeout CONF_TIMEOUT_MULT; 1269 if (timeout > CONF_TIMEOUT_MAX) 1270 timeout = CONF_TIMEOUT_MAX; 1271 1272 pr_cont("."); 1273 } 1274 1275 #ifdef IPCONFIG_BOOTP 1276 if (do_bootp) 1277 ic_bootp_cleanup(); 1278 #endif 1279 #ifdef IPCONFIG_RARP 1280 if (do_rarp) 1281 ic_rarp_cleanup(); 1282 #endif 1283 1284 if (!ic_got_reply) { 1285 ic_myaddr = NONE; 1286 return -1; 1287 } 1288 1289 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n", 1290 ((ic_got_reply & IC_RARP) ? "RARP" 1291 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1292 &ic_addrservaddr, &ic_myaddr); 1293 1294 return 0; 1295 } 1296 1297 #endif /* IPCONFIG_DYNAMIC */ 1298 1299 #ifdef CONFIG_PROC_FS 1300 1301 static int pnp_seq_show(struct seq_file *seq, void *v) 1302 { 1303 int i; 1304 1305 if (ic_proto_used & IC_PROTO) 1306 seq_printf(seq, "#PROTO: %s\n", 1307 (ic_proto_used & IC_RARP) ? "RARP" 1308 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1309 else 1310 seq_puts(seq, "#MANUAL\n"); 1311 1312 if (ic_domain[0]) 1313 seq_printf(seq, 1314 "domain %s\n", ic_domain); 1315 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1316 if (ic_nameservers[i] != NONE) 1317 seq_printf(seq, "nameserver %pI4\n", 1318 &ic_nameservers[i]); 1319 } 1320 if (ic_servaddr != NONE) 1321 seq_printf(seq, "bootserver %pI4\n", 1322 &ic_servaddr); 1323 return 0; 1324 } 1325 1326 static int pnp_seq_open(struct inode *indoe, struct file *file) 1327 { 1328 return single_open(file, pnp_seq_show, NULL); 1329 } 1330 1331 static const struct file_operations pnp_seq_fops = { 1332 .owner = THIS_MODULE, 1333 .open = pnp_seq_open, 1334 .read = seq_read, 1335 .llseek = seq_lseek, 1336 .release = single_release, 1337 }; 1338 #endif /* CONFIG_PROC_FS */ 1339 1340 /* 1341 * Extract IP address from the parameter string if needed. Note that we 1342 * need to have root_server_addr set _before_ IPConfig gets called as it 1343 * can override it. 1344 */ 1345 __be32 __init root_nfs_parse_addr(char *name) 1346 { 1347 __be32 addr; 1348 int octets = 0; 1349 char *cp, *cq; 1350 1351 cp = cq = name; 1352 while (octets < 4) { 1353 while (*cp >= '0' && *cp <= '9') 1354 cp++; 1355 if (cp == cq || cp - cq > 3) 1356 break; 1357 if (*cp == '.' || octets == 3) 1358 octets++; 1359 if (octets < 4) 1360 cp++; 1361 cq = cp; 1362 } 1363 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1364 if (*cp == ':') 1365 *cp++ = '\0'; 1366 addr = in_aton(name); 1367 memmove(name, cp, strlen(cp) + 1); 1368 } else 1369 addr = NONE; 1370 1371 return addr; 1372 } 1373 1374 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1375 1376 static int __init wait_for_devices(void) 1377 { 1378 int i; 1379 1380 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1381 struct net_device *dev; 1382 int found = 0; 1383 1384 rtnl_lock(); 1385 for_each_netdev(&init_net, dev) { 1386 if (ic_is_init_dev(dev)) { 1387 found = 1; 1388 break; 1389 } 1390 } 1391 rtnl_unlock(); 1392 if (found) 1393 return 0; 1394 ssleep(1); 1395 } 1396 return -ENODEV; 1397 } 1398 1399 /* 1400 * IP Autoconfig dispatcher. 1401 */ 1402 1403 static int __init ip_auto_config(void) 1404 { 1405 __be32 addr; 1406 #ifdef IPCONFIG_DYNAMIC 1407 int retries = CONF_OPEN_RETRIES; 1408 #endif 1409 int err; 1410 unsigned int i; 1411 1412 #ifdef CONFIG_PROC_FS 1413 proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops); 1414 #endif /* CONFIG_PROC_FS */ 1415 1416 if (!ic_enable) 1417 return 0; 1418 1419 pr_debug("IP-Config: Entered.\n"); 1420 #ifdef IPCONFIG_DYNAMIC 1421 try_try_again: 1422 #endif 1423 /* Wait for devices to appear */ 1424 err = wait_for_devices(); 1425 if (err) 1426 return err; 1427 1428 /* Setup all network devices */ 1429 err = ic_open_devs(); 1430 if (err) 1431 return err; 1432 1433 /* Give drivers a chance to settle */ 1434 msleep(CONF_POST_OPEN); 1435 1436 /* 1437 * If the config information is insufficient (e.g., our IP address or 1438 * IP address of the boot server is missing or we have multiple network 1439 * interfaces and no default was set), use BOOTP or RARP to get the 1440 * missing values. 1441 */ 1442 if (ic_myaddr == NONE || 1443 #ifdef CONFIG_ROOT_NFS 1444 (root_server_addr == NONE && 1445 ic_servaddr == NONE && 1446 ROOT_DEV == Root_NFS) || 1447 #endif 1448 ic_first_dev->next) { 1449 #ifdef IPCONFIG_DYNAMIC 1450 if (ic_dynamic() < 0) { 1451 ic_close_devs(); 1452 1453 /* 1454 * I don't know why, but sometimes the 1455 * eepro100 driver (at least) gets upset and 1456 * doesn't work the first time it's opened. 1457 * But then if you close it and reopen it, it 1458 * works just fine. So we need to try that at 1459 * least once before giving up. 1460 * 1461 * Also, if the root will be NFS-mounted, we 1462 * have nowhere to go if DHCP fails. So we 1463 * just have to keep trying forever. 1464 * 1465 * -- Chip 1466 */ 1467 #ifdef CONFIG_ROOT_NFS 1468 if (ROOT_DEV == Root_NFS) { 1469 pr_err("IP-Config: Retrying forever (NFS root)...\n"); 1470 goto try_try_again; 1471 } 1472 #endif 1473 1474 if (--retries) { 1475 pr_err("IP-Config: Reopening network devices...\n"); 1476 goto try_try_again; 1477 } 1478 1479 /* Oh, well. At least we tried. */ 1480 pr_err("IP-Config: Auto-configuration of network failed\n"); 1481 return -1; 1482 } 1483 #else /* !DYNAMIC */ 1484 pr_err("IP-Config: Incomplete network configuration information\n"); 1485 ic_close_devs(); 1486 return -1; 1487 #endif /* IPCONFIG_DYNAMIC */ 1488 } else { 1489 /* Device selected manually or only one device -> use it */ 1490 ic_dev = ic_first_dev->dev; 1491 } 1492 1493 addr = root_nfs_parse_addr(root_server_path); 1494 if (root_server_addr == NONE) 1495 root_server_addr = addr; 1496 1497 /* 1498 * Use defaults wherever applicable. 1499 */ 1500 if (ic_defaults() < 0) 1501 return -1; 1502 1503 /* 1504 * Close all network devices except the device we've 1505 * autoconfigured and set up routes. 1506 */ 1507 ic_close_devs(); 1508 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1509 return -1; 1510 1511 /* 1512 * Record which protocol was actually used. 1513 */ 1514 #ifdef IPCONFIG_DYNAMIC 1515 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1516 #endif 1517 1518 #ifndef IPCONFIG_SILENT 1519 /* 1520 * Clue in the operator. 1521 */ 1522 pr_info("IP-Config: Complete:\n"); 1523 1524 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", 1525 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr, 1526 &ic_myaddr, &ic_netmask, &ic_gateway); 1527 pr_info(" host=%s, domain=%s, nis-domain=%s\n", 1528 utsname()->nodename, ic_domain, utsname()->domainname); 1529 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", 1530 &ic_servaddr, &root_server_addr, root_server_path); 1531 if (ic_dev_mtu) 1532 pr_cont(", mtu=%d", ic_dev_mtu); 1533 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 1534 if (ic_nameservers[i] != NONE) { 1535 pr_cont(" nameserver%u=%pI4", 1536 i, &ic_nameservers[i]); 1537 break; 1538 } 1539 for (i++; i < CONF_NAMESERVERS_MAX; i++) 1540 if (ic_nameservers[i] != NONE) 1541 pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]); 1542 pr_cont("\n"); 1543 #endif /* !SILENT */ 1544 1545 return 0; 1546 } 1547 1548 late_initcall(ip_auto_config); 1549 1550 1551 /* 1552 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1553 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. 1554 */ 1555 static int __init ic_proto_name(char *name) 1556 { 1557 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1558 return 1; 1559 } 1560 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1561 return 0; 1562 } 1563 #ifdef CONFIG_IP_PNP_DHCP 1564 else if (!strncmp(name, "dhcp", 4)) { 1565 char *client_id; 1566 1567 ic_proto_enabled &= ~IC_RARP; 1568 client_id = strstr(name, "dhcp,"); 1569 if (client_id) { 1570 char *v; 1571 1572 client_id = client_id + 5; 1573 v = strchr(client_id, ','); 1574 if (!v) 1575 return 1; 1576 *v = 0; 1577 if (kstrtou8(client_id, 0, dhcp_client_identifier)) 1578 pr_debug("DHCP: Invalid client identifier type\n"); 1579 strncpy(dhcp_client_identifier + 1, v + 1, 251); 1580 *v = ','; 1581 } 1582 return 1; 1583 } 1584 #endif 1585 #ifdef CONFIG_IP_PNP_BOOTP 1586 else if (!strcmp(name, "bootp")) { 1587 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1588 return 1; 1589 } 1590 #endif 1591 #ifdef CONFIG_IP_PNP_RARP 1592 else if (!strcmp(name, "rarp")) { 1593 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1594 return 1; 1595 } 1596 #endif 1597 #ifdef IPCONFIG_DYNAMIC 1598 else if (!strcmp(name, "both")) { 1599 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1600 return 1; 1601 } 1602 #endif 1603 return 0; 1604 } 1605 1606 static int __init ip_auto_config_setup(char *addrs) 1607 { 1608 char *cp, *ip, *dp; 1609 int num = 0; 1610 1611 ic_set_manually = 1; 1612 ic_enable = 1; 1613 1614 /* 1615 * If any dhcp, bootp etc options are set, leave autoconfig on 1616 * and skip the below static IP processing. 1617 */ 1618 if (ic_proto_name(addrs)) 1619 return 1; 1620 1621 /* If no static IP is given, turn off autoconfig and bail. */ 1622 if (*addrs == 0 || 1623 strcmp(addrs, "off") == 0 || 1624 strcmp(addrs, "none") == 0) { 1625 ic_enable = 0; 1626 return 1; 1627 } 1628 1629 ic_nameservers_predef(); 1630 1631 /* Parse string for static IP assignment. */ 1632 ip = addrs; 1633 while (ip && *ip) { 1634 if ((cp = strchr(ip, ':'))) 1635 *cp++ = '\0'; 1636 if (strlen(ip) > 0) { 1637 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip); 1638 switch (num) { 1639 case 0: 1640 if ((ic_myaddr = in_aton(ip)) == ANY) 1641 ic_myaddr = NONE; 1642 break; 1643 case 1: 1644 if ((ic_servaddr = in_aton(ip)) == ANY) 1645 ic_servaddr = NONE; 1646 break; 1647 case 2: 1648 if ((ic_gateway = in_aton(ip)) == ANY) 1649 ic_gateway = NONE; 1650 break; 1651 case 3: 1652 if ((ic_netmask = in_aton(ip)) == ANY) 1653 ic_netmask = NONE; 1654 break; 1655 case 4: 1656 if ((dp = strchr(ip, '.'))) { 1657 *dp++ = '\0'; 1658 strlcpy(utsname()->domainname, dp, 1659 sizeof(utsname()->domainname)); 1660 } 1661 strlcpy(utsname()->nodename, ip, 1662 sizeof(utsname()->nodename)); 1663 ic_host_name_set = 1; 1664 break; 1665 case 5: 1666 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1667 break; 1668 case 6: 1669 if (ic_proto_name(ip) == 0 && 1670 ic_myaddr == NONE) { 1671 ic_enable = 0; 1672 } 1673 break; 1674 case 7: 1675 if (CONF_NAMESERVERS_MAX >= 1) { 1676 ic_nameservers[0] = in_aton(ip); 1677 if (ic_nameservers[0] == ANY) 1678 ic_nameservers[0] = NONE; 1679 } 1680 break; 1681 case 8: 1682 if (CONF_NAMESERVERS_MAX >= 2) { 1683 ic_nameservers[1] = in_aton(ip); 1684 if (ic_nameservers[1] == ANY) 1685 ic_nameservers[1] = NONE; 1686 } 1687 break; 1688 } 1689 } 1690 ip = cp; 1691 num++; 1692 } 1693 1694 return 1; 1695 } 1696 __setup("ip=", ip_auto_config_setup); 1697 1698 static int __init nfsaddrs_config_setup(char *addrs) 1699 { 1700 return ip_auto_config_setup(addrs); 1701 } 1702 __setup("nfsaddrs=", nfsaddrs_config_setup); 1703 1704 static int __init vendor_class_identifier_setup(char *addrs) 1705 { 1706 if (strlcpy(vendor_class_identifier, addrs, 1707 sizeof(vendor_class_identifier)) 1708 >= sizeof(vendor_class_identifier)) 1709 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n", 1710 vendor_class_identifier); 1711 return 1; 1712 } 1713 __setup("dhcpclass=", vendor_class_identifier_setup); 1714