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 static int ic_proto_used; /* Protocol used, if any */ 147 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 148 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 149 150 /* 151 * Private state. 152 */ 153 154 /* Name of user-selected boot device */ 155 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 156 157 /* Protocols supported by available interfaces */ 158 static int ic_proto_have_if __initdata; 159 160 /* MTU for boot device */ 161 static int ic_dev_mtu __initdata; 162 163 #ifdef IPCONFIG_DYNAMIC 164 static DEFINE_SPINLOCK(ic_recv_lock); 165 static volatile int ic_got_reply __initdata; /* Proto(s) that replied */ 166 #endif 167 #ifdef IPCONFIG_DHCP 168 static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */ 169 #endif 170 171 172 /* 173 * Network devices 174 */ 175 176 struct ic_device { 177 struct ic_device *next; 178 struct net_device *dev; 179 unsigned short flags; 180 short able; 181 __be32 xid; 182 }; 183 184 static struct ic_device *ic_first_dev __initdata; /* List of open device */ 185 static struct net_device *ic_dev __initdata; /* Selected device */ 186 187 static bool __init ic_is_init_dev(struct net_device *dev) 188 { 189 if (dev->flags & IFF_LOOPBACK) 190 return false; 191 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 192 (!(dev->flags & IFF_LOOPBACK) && 193 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 194 strncmp(dev->name, "dummy", 5)); 195 } 196 197 static int __init ic_open_devs(void) 198 { 199 struct ic_device *d, **last; 200 struct net_device *dev; 201 unsigned short oflags; 202 unsigned long start, next_msg; 203 204 last = &ic_first_dev; 205 rtnl_lock(); 206 207 /* bring loopback and DSA master network devices up first */ 208 for_each_netdev(&init_net, dev) { 209 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev)) 210 continue; 211 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) 212 pr_err("IP-Config: Failed to open %s\n", dev->name); 213 } 214 215 for_each_netdev(&init_net, dev) { 216 if (ic_is_init_dev(dev)) { 217 int able = 0; 218 if (dev->mtu >= 364) 219 able |= IC_BOOTP; 220 else 221 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n", 222 dev->name, dev->mtu); 223 if (!(dev->flags & IFF_NOARP)) 224 able |= IC_RARP; 225 able &= ic_proto_enabled; 226 if (ic_proto_enabled && !able) 227 continue; 228 oflags = dev->flags; 229 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 230 pr_err("IP-Config: Failed to open %s\n", 231 dev->name); 232 continue; 233 } 234 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 235 rtnl_unlock(); 236 return -ENOMEM; 237 } 238 d->dev = dev; 239 *last = d; 240 last = &d->next; 241 d->flags = oflags; 242 d->able = able; 243 if (able & IC_BOOTP) 244 get_random_bytes(&d->xid, sizeof(__be32)); 245 else 246 d->xid = 0; 247 ic_proto_have_if |= able; 248 pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n", 249 dev->name, able, d->xid); 250 } 251 } 252 253 /* no point in waiting if we could not bring up at least one device */ 254 if (!ic_first_dev) 255 goto have_carrier; 256 257 /* wait for a carrier on at least one device */ 258 start = jiffies; 259 next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12); 260 while (time_before(jiffies, start + 261 msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) { 262 int wait, elapsed; 263 264 for_each_netdev(&init_net, dev) 265 if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) 266 goto have_carrier; 267 268 msleep(1); 269 270 if (time_before(jiffies, next_msg)) 271 continue; 272 273 elapsed = jiffies_to_msecs(jiffies - start); 274 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000; 275 pr_info("Waiting up to %d more seconds for network.\n", wait); 276 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12); 277 } 278 have_carrier: 279 rtnl_unlock(); 280 281 *last = NULL; 282 283 if (!ic_first_dev) { 284 if (user_dev_name[0]) 285 pr_err("IP-Config: Device `%s' not found\n", 286 user_dev_name); 287 else 288 pr_err("IP-Config: No network devices available\n"); 289 return -ENODEV; 290 } 291 return 0; 292 } 293 294 static void __init ic_close_devs(void) 295 { 296 struct ic_device *d, *next; 297 struct net_device *dev; 298 299 rtnl_lock(); 300 next = ic_first_dev; 301 while ((d = next)) { 302 next = d->next; 303 dev = d->dev; 304 if (dev != ic_dev && !netdev_uses_dsa(dev)) { 305 pr_debug("IP-Config: Downing %s\n", dev->name); 306 dev_change_flags(dev, d->flags); 307 } 308 kfree(d); 309 } 310 rtnl_unlock(); 311 } 312 313 /* 314 * Interface to various network functions. 315 */ 316 317 static inline void 318 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 319 { 320 sin->sin_family = AF_INET; 321 sin->sin_addr.s_addr = addr; 322 sin->sin_port = port; 323 } 324 325 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg) 326 { 327 int res; 328 329 mm_segment_t oldfs = get_fs(); 330 set_fs(get_ds()); 331 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 332 set_fs(oldfs); 333 return res; 334 } 335 336 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 337 { 338 int res; 339 340 mm_segment_t oldfs = get_fs(); 341 set_fs(get_ds()); 342 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 343 set_fs(oldfs); 344 return res; 345 } 346 347 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 348 { 349 int res; 350 351 mm_segment_t oldfs = get_fs(); 352 set_fs(get_ds()); 353 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); 354 set_fs(oldfs); 355 return res; 356 } 357 358 /* 359 * Set up interface addresses and routes. 360 */ 361 362 static int __init ic_setup_if(void) 363 { 364 struct ifreq ir; 365 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 366 int err; 367 368 memset(&ir, 0, sizeof(ir)); 369 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); 370 set_sockaddr(sin, ic_myaddr, 0); 371 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) { 372 pr_err("IP-Config: Unable to set interface address (%d)\n", 373 err); 374 return -1; 375 } 376 set_sockaddr(sin, ic_netmask, 0); 377 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 378 pr_err("IP-Config: Unable to set interface netmask (%d)\n", 379 err); 380 return -1; 381 } 382 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 383 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 384 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n", 385 err); 386 return -1; 387 } 388 /* Handle the case where we need non-standard MTU on the boot link (a network 389 * using jumbo frames, for instance). If we can't set the mtu, don't error 390 * out, we'll try to muddle along. 391 */ 392 if (ic_dev_mtu != 0) { 393 strcpy(ir.ifr_name, ic_dev->name); 394 ir.ifr_mtu = ic_dev_mtu; 395 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0) 396 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", 397 ic_dev_mtu, err); 398 } 399 return 0; 400 } 401 402 static int __init ic_setup_routes(void) 403 { 404 /* No need to setup device routes, only the default route... */ 405 406 if (ic_gateway != NONE) { 407 struct rtentry rm; 408 int err; 409 410 memset(&rm, 0, sizeof(rm)); 411 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 412 pr_err("IP-Config: Gateway not on directly connected network\n"); 413 return -1; 414 } 415 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 416 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 417 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 418 rm.rt_flags = RTF_UP | RTF_GATEWAY; 419 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 420 pr_err("IP-Config: Cannot add default route (%d)\n", 421 err); 422 return -1; 423 } 424 } 425 426 return 0; 427 } 428 429 /* 430 * Fill in default values for all missing parameters. 431 */ 432 433 static int __init ic_defaults(void) 434 { 435 /* 436 * At this point we have no userspace running so need not 437 * claim locks on system_utsname 438 */ 439 440 if (!ic_host_name_set) 441 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 442 443 if (root_server_addr == NONE) 444 root_server_addr = ic_servaddr; 445 446 if (ic_netmask == NONE) { 447 if (IN_CLASSA(ntohl(ic_myaddr))) 448 ic_netmask = htonl(IN_CLASSA_NET); 449 else if (IN_CLASSB(ntohl(ic_myaddr))) 450 ic_netmask = htonl(IN_CLASSB_NET); 451 else if (IN_CLASSC(ntohl(ic_myaddr))) 452 ic_netmask = htonl(IN_CLASSC_NET); 453 else { 454 pr_err("IP-Config: Unable to guess netmask for address %pI4\n", 455 &ic_myaddr); 456 return -1; 457 } 458 pr_notice("IP-Config: Guessing netmask %pI4\n", 459 &ic_netmask); 460 } 461 462 return 0; 463 } 464 465 /* 466 * RARP support. 467 */ 468 469 #ifdef IPCONFIG_RARP 470 471 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 472 473 static struct packet_type rarp_packet_type __initdata = { 474 .type = cpu_to_be16(ETH_P_RARP), 475 .func = ic_rarp_recv, 476 }; 477 478 static inline void __init ic_rarp_init(void) 479 { 480 dev_add_pack(&rarp_packet_type); 481 } 482 483 static inline void __init ic_rarp_cleanup(void) 484 { 485 dev_remove_pack(&rarp_packet_type); 486 } 487 488 /* 489 * Process received RARP packet. 490 */ 491 static int __init 492 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 493 { 494 struct arphdr *rarp; 495 unsigned char *rarp_ptr; 496 __be32 sip, tip; 497 unsigned char *tha; /* t for "target" */ 498 struct ic_device *d; 499 500 if (!net_eq(dev_net(dev), &init_net)) 501 goto drop; 502 503 skb = skb_share_check(skb, GFP_ATOMIC); 504 if (!skb) 505 return NET_RX_DROP; 506 507 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 508 goto drop; 509 510 /* Basic sanity checks can be done without the lock. */ 511 rarp = (struct arphdr *)skb_transport_header(skb); 512 513 /* If this test doesn't pass, it's not IP, or we should 514 * ignore it anyway. 515 */ 516 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 517 goto drop; 518 519 /* If it's not a RARP reply, delete it. */ 520 if (rarp->ar_op != htons(ARPOP_RREPLY)) 521 goto drop; 522 523 /* If it's not Ethernet, delete it. */ 524 if (rarp->ar_pro != htons(ETH_P_IP)) 525 goto drop; 526 527 if (!pskb_may_pull(skb, arp_hdr_len(dev))) 528 goto drop; 529 530 /* OK, it is all there and looks valid, process... */ 531 rarp = (struct arphdr *)skb_transport_header(skb); 532 rarp_ptr = (unsigned char *) (rarp + 1); 533 534 /* One reply at a time, please. */ 535 spin_lock(&ic_recv_lock); 536 537 /* If we already have a reply, just drop the packet */ 538 if (ic_got_reply) 539 goto drop_unlock; 540 541 /* Find the ic_device that the packet arrived on */ 542 d = ic_first_dev; 543 while (d && d->dev != dev) 544 d = d->next; 545 if (!d) 546 goto drop_unlock; /* should never happen */ 547 548 /* Extract variable-width fields */ 549 rarp_ptr += dev->addr_len; 550 memcpy(&sip, rarp_ptr, 4); 551 rarp_ptr += 4; 552 tha = rarp_ptr; 553 rarp_ptr += dev->addr_len; 554 memcpy(&tip, rarp_ptr, 4); 555 556 /* Discard packets which are not meant for us. */ 557 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 558 goto drop_unlock; 559 560 /* Discard packets which are not from specified server. */ 561 if (ic_servaddr != NONE && ic_servaddr != sip) 562 goto drop_unlock; 563 564 /* We have a winner! */ 565 ic_dev = dev; 566 if (ic_myaddr == NONE) 567 ic_myaddr = tip; 568 ic_servaddr = sip; 569 ic_addrservaddr = sip; 570 ic_got_reply = IC_RARP; 571 572 drop_unlock: 573 /* Show's over. Nothing to see here. */ 574 spin_unlock(&ic_recv_lock); 575 576 drop: 577 /* Throw the packet out. */ 578 kfree_skb(skb); 579 return 0; 580 } 581 582 583 /* 584 * Send RARP request packet over a single interface. 585 */ 586 static void __init ic_rarp_send_if(struct ic_device *d) 587 { 588 struct net_device *dev = d->dev; 589 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 590 dev->dev_addr, dev->dev_addr); 591 } 592 #endif 593 594 /* 595 * Predefine Nameservers 596 */ 597 static inline void __init ic_nameservers_predef(void) 598 { 599 int i; 600 601 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 602 ic_nameservers[i] = NONE; 603 } 604 605 /* 606 * DHCP/BOOTP support. 607 */ 608 609 #ifdef IPCONFIG_BOOTP 610 611 struct bootp_pkt { /* BOOTP packet format */ 612 struct iphdr iph; /* IP header */ 613 struct udphdr udph; /* UDP header */ 614 u8 op; /* 1=request, 2=reply */ 615 u8 htype; /* HW address type */ 616 u8 hlen; /* HW address length */ 617 u8 hops; /* Used only by gateways */ 618 __be32 xid; /* Transaction ID */ 619 __be16 secs; /* Seconds since we started */ 620 __be16 flags; /* Just what it says */ 621 __be32 client_ip; /* Client's IP address if known */ 622 __be32 your_ip; /* Assigned IP address */ 623 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 624 __be32 relay_ip; /* IP address of BOOTP relay */ 625 u8 hw_addr[16]; /* Client's HW address */ 626 u8 serv_name[64]; /* Server host name */ 627 u8 boot_file[128]; /* Name of boot file */ 628 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 629 }; 630 631 /* packet ops */ 632 #define BOOTP_REQUEST 1 633 #define BOOTP_REPLY 2 634 635 /* DHCP message types */ 636 #define DHCPDISCOVER 1 637 #define DHCPOFFER 2 638 #define DHCPREQUEST 3 639 #define DHCPDECLINE 4 640 #define DHCPACK 5 641 #define DHCPNAK 6 642 #define DHCPRELEASE 7 643 #define DHCPINFORM 8 644 645 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 646 647 static struct packet_type bootp_packet_type __initdata = { 648 .type = cpu_to_be16(ETH_P_IP), 649 .func = ic_bootp_recv, 650 }; 651 652 static __be32 ic_dev_xid; /* Device under configuration */ 653 654 /* 655 * Initialize DHCP/BOOTP extension fields in the request. 656 */ 657 658 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 659 660 #ifdef IPCONFIG_DHCP 661 662 static void __init 663 ic_dhcp_init_options(u8 *options) 664 { 665 u8 mt = ((ic_servaddr == NONE) 666 ? DHCPDISCOVER : DHCPREQUEST); 667 u8 *e = options; 668 int len; 669 670 pr_debug("DHCP: Sending message type %d\n", mt); 671 672 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 673 e += 4; 674 675 *e++ = 53; /* DHCP message type */ 676 *e++ = 1; 677 *e++ = mt; 678 679 if (mt == DHCPREQUEST) { 680 *e++ = 54; /* Server ID (IP address) */ 681 *e++ = 4; 682 memcpy(e, &ic_servaddr, 4); 683 e += 4; 684 685 *e++ = 50; /* Requested IP address */ 686 *e++ = 4; 687 memcpy(e, &ic_myaddr, 4); 688 e += 4; 689 } 690 691 /* always? */ 692 { 693 static const u8 ic_req_params[] = { 694 1, /* Subnet mask */ 695 3, /* Default gateway */ 696 6, /* DNS server */ 697 12, /* Host name */ 698 15, /* Domain name */ 699 17, /* Boot path */ 700 26, /* MTU */ 701 40, /* NIS domain name */ 702 }; 703 704 *e++ = 55; /* Parameter request list */ 705 *e++ = sizeof(ic_req_params); 706 memcpy(e, ic_req_params, sizeof(ic_req_params)); 707 e += sizeof(ic_req_params); 708 709 if (ic_host_name_set) { 710 *e++ = 12; /* host-name */ 711 len = strlen(utsname()->nodename); 712 *e++ = len; 713 memcpy(e, utsname()->nodename, len); 714 e += len; 715 } 716 if (*vendor_class_identifier) { 717 pr_info("DHCP: sending class identifier \"%s\"\n", 718 vendor_class_identifier); 719 *e++ = 60; /* Class-identifier */ 720 len = strlen(vendor_class_identifier); 721 *e++ = len; 722 memcpy(e, vendor_class_identifier, len); 723 e += len; 724 } 725 len = strlen(dhcp_client_identifier + 1); 726 /* the minimum length of identifier is 2, include 1 byte type, 727 * and can not be larger than the length of options 728 */ 729 if (len >= 1 && len < 312 - (e - options) - 1) { 730 *e++ = 61; 731 *e++ = len + 1; 732 memcpy(e, dhcp_client_identifier, len + 1); 733 e += len + 1; 734 } 735 } 736 737 *e++ = 255; /* End of the list */ 738 } 739 740 #endif /* IPCONFIG_DHCP */ 741 742 static void __init ic_bootp_init_ext(u8 *e) 743 { 744 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 745 e += 4; 746 *e++ = 1; /* Subnet mask request */ 747 *e++ = 4; 748 e += 4; 749 *e++ = 3; /* Default gateway request */ 750 *e++ = 4; 751 e += 4; 752 *e++ = 5; /* Name server request */ 753 *e++ = 8; 754 e += 8; 755 *e++ = 12; /* Host name request */ 756 *e++ = 32; 757 e += 32; 758 *e++ = 40; /* NIS Domain name request */ 759 *e++ = 32; 760 e += 32; 761 *e++ = 17; /* Boot path */ 762 *e++ = 40; 763 e += 40; 764 765 *e++ = 57; /* set extension buffer size for reply */ 766 *e++ = 2; 767 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 768 *e++ = 150; 769 770 *e++ = 255; /* End of the list */ 771 } 772 773 774 /* 775 * Initialize the DHCP/BOOTP mechanism. 776 */ 777 static inline void __init ic_bootp_init(void) 778 { 779 ic_nameservers_predef(); 780 781 dev_add_pack(&bootp_packet_type); 782 } 783 784 785 /* 786 * DHCP/BOOTP cleanup. 787 */ 788 static inline void __init ic_bootp_cleanup(void) 789 { 790 dev_remove_pack(&bootp_packet_type); 791 } 792 793 794 /* 795 * Send DHCP/BOOTP request to single interface. 796 */ 797 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 798 { 799 struct net_device *dev = d->dev; 800 struct sk_buff *skb; 801 struct bootp_pkt *b; 802 struct iphdr *h; 803 int hlen = LL_RESERVED_SPACE(dev); 804 int tlen = dev->needed_tailroom; 805 806 /* Allocate packet */ 807 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, 808 GFP_KERNEL); 809 if (!skb) 810 return; 811 skb_reserve(skb, hlen); 812 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 813 memset(b, 0, sizeof(struct bootp_pkt)); 814 815 /* Construct IP header */ 816 skb_reset_network_header(skb); 817 h = ip_hdr(skb); 818 h->version = 4; 819 h->ihl = 5; 820 h->tot_len = htons(sizeof(struct bootp_pkt)); 821 h->frag_off = htons(IP_DF); 822 h->ttl = 64; 823 h->protocol = IPPROTO_UDP; 824 h->daddr = htonl(INADDR_BROADCAST); 825 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 826 827 /* Construct UDP header */ 828 b->udph.source = htons(68); 829 b->udph.dest = htons(67); 830 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 831 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 832 833 /* Construct DHCP/BOOTP header */ 834 b->op = BOOTP_REQUEST; 835 if (dev->type < 256) /* check for false types */ 836 b->htype = dev->type; 837 else if (dev->type == ARPHRD_FDDI) 838 b->htype = ARPHRD_ETHER; 839 else { 840 pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type, 841 dev->name); 842 b->htype = dev->type; /* can cause undefined behavior */ 843 } 844 845 /* server_ip and your_ip address are both already zero per RFC2131 */ 846 b->hlen = dev->addr_len; 847 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 848 b->secs = htons(jiffies_diff / HZ); 849 b->xid = d->xid; 850 851 /* add DHCP options or BOOTP extensions */ 852 #ifdef IPCONFIG_DHCP 853 if (ic_proto_enabled & IC_USE_DHCP) 854 ic_dhcp_init_options(b->exten); 855 else 856 #endif 857 ic_bootp_init_ext(b->exten); 858 859 /* Chain packet down the line... */ 860 skb->dev = dev; 861 skb->protocol = htons(ETH_P_IP); 862 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 863 dev->broadcast, dev->dev_addr, skb->len) < 0) { 864 kfree_skb(skb); 865 printk("E"); 866 return; 867 } 868 869 if (dev_queue_xmit(skb) < 0) 870 printk("E"); 871 } 872 873 874 /* 875 * Copy BOOTP-supplied string if not already set. 876 */ 877 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 878 { 879 if (!len) 880 return 0; 881 if (len > max-1) 882 len = max-1; 883 memcpy(dest, src, len); 884 dest[len] = '\0'; 885 return 1; 886 } 887 888 889 /* 890 * Process BOOTP extensions. 891 */ 892 static void __init ic_do_bootp_ext(u8 *ext) 893 { 894 u8 servers; 895 int i; 896 __be16 mtu; 897 898 u8 *c; 899 900 pr_debug("DHCP/BOOTP: Got extension %d:", *ext); 901 for (c=ext+2; c<ext+2+ext[1]; c++) 902 pr_debug(" %02x", *c); 903 pr_debug("\n"); 904 905 switch (*ext++) { 906 case 1: /* Subnet mask */ 907 if (ic_netmask == NONE) 908 memcpy(&ic_netmask, ext+1, 4); 909 break; 910 case 3: /* Default gateway */ 911 if (ic_gateway == NONE) 912 memcpy(&ic_gateway, ext+1, 4); 913 break; 914 case 6: /* DNS server */ 915 servers= *ext/4; 916 if (servers > CONF_NAMESERVERS_MAX) 917 servers = CONF_NAMESERVERS_MAX; 918 for (i = 0; i < servers; i++) { 919 if (ic_nameservers[i] == NONE) 920 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 921 } 922 break; 923 case 12: /* Host name */ 924 ic_bootp_string(utsname()->nodename, ext+1, *ext, 925 __NEW_UTS_LEN); 926 ic_host_name_set = 1; 927 break; 928 case 15: /* Domain name (DNS) */ 929 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 930 break; 931 case 17: /* Root path */ 932 if (!root_server_path[0]) 933 ic_bootp_string(root_server_path, ext+1, *ext, 934 sizeof(root_server_path)); 935 break; 936 case 26: /* Interface MTU */ 937 memcpy(&mtu, ext+1, sizeof(mtu)); 938 ic_dev_mtu = ntohs(mtu); 939 break; 940 case 40: /* NIS Domain name (_not_ DNS) */ 941 ic_bootp_string(utsname()->domainname, ext+1, *ext, 942 __NEW_UTS_LEN); 943 break; 944 } 945 } 946 947 948 /* 949 * Receive BOOTP reply. 950 */ 951 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 952 { 953 struct bootp_pkt *b; 954 struct iphdr *h; 955 struct ic_device *d; 956 int len, ext_len; 957 958 if (!net_eq(dev_net(dev), &init_net)) 959 goto drop; 960 961 /* Perform verifications before taking the lock. */ 962 if (skb->pkt_type == PACKET_OTHERHOST) 963 goto drop; 964 965 skb = skb_share_check(skb, GFP_ATOMIC); 966 if (!skb) 967 return NET_RX_DROP; 968 969 if (!pskb_may_pull(skb, 970 sizeof(struct iphdr) + 971 sizeof(struct udphdr))) 972 goto drop; 973 974 b = (struct bootp_pkt *)skb_network_header(skb); 975 h = &b->iph; 976 977 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 978 goto drop; 979 980 /* Fragments are not supported */ 981 if (ip_is_fragment(h)) { 982 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); 983 goto drop; 984 } 985 986 if (skb->len < ntohs(h->tot_len)) 987 goto drop; 988 989 if (ip_fast_csum((char *) h, h->ihl)) 990 goto drop; 991 992 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 993 goto drop; 994 995 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 996 goto drop; 997 998 len = ntohs(b->udph.len) - sizeof(struct udphdr); 999 ext_len = len - (sizeof(*b) - 1000 sizeof(struct iphdr) - 1001 sizeof(struct udphdr) - 1002 sizeof(b->exten)); 1003 if (ext_len < 0) 1004 goto drop; 1005 1006 /* Ok the front looks good, make sure we can get at the rest. */ 1007 if (!pskb_may_pull(skb, skb->len)) 1008 goto drop; 1009 1010 b = (struct bootp_pkt *)skb_network_header(skb); 1011 h = &b->iph; 1012 1013 /* One reply at a time, please. */ 1014 spin_lock(&ic_recv_lock); 1015 1016 /* If we already have a reply, just drop the packet */ 1017 if (ic_got_reply) 1018 goto drop_unlock; 1019 1020 /* Find the ic_device that the packet arrived on */ 1021 d = ic_first_dev; 1022 while (d && d->dev != dev) 1023 d = d->next; 1024 if (!d) 1025 goto drop_unlock; /* should never happen */ 1026 1027 /* Is it a reply to our BOOTP request? */ 1028 if (b->op != BOOTP_REPLY || 1029 b->xid != d->xid) { 1030 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n", 1031 b->op, b->xid); 1032 goto drop_unlock; 1033 } 1034 1035 /* Is it a reply for the device we are configuring? */ 1036 if (b->xid != ic_dev_xid) { 1037 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n"); 1038 goto drop_unlock; 1039 } 1040 1041 /* Parse extensions */ 1042 if (ext_len >= 4 && 1043 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1044 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1045 u8 *ext; 1046 1047 #ifdef IPCONFIG_DHCP 1048 if (ic_proto_enabled & IC_USE_DHCP) { 1049 __be32 server_id = NONE; 1050 int mt = 0; 1051 1052 ext = &b->exten[4]; 1053 while (ext < end && *ext != 0xff) { 1054 u8 *opt = ext++; 1055 if (*opt == 0) /* Padding */ 1056 continue; 1057 ext += *ext + 1; 1058 if (ext >= end) 1059 break; 1060 switch (*opt) { 1061 case 53: /* Message type */ 1062 if (opt[1]) 1063 mt = opt[2]; 1064 break; 1065 case 54: /* Server ID (IP address) */ 1066 if (opt[1] >= 4) 1067 memcpy(&server_id, opt + 2, 4); 1068 break; 1069 } 1070 } 1071 1072 pr_debug("DHCP: Got message type %d\n", mt); 1073 1074 switch (mt) { 1075 case DHCPOFFER: 1076 /* While in the process of accepting one offer, 1077 * ignore all others. 1078 */ 1079 if (ic_myaddr != NONE) 1080 goto drop_unlock; 1081 1082 /* Let's accept that offer. */ 1083 ic_myaddr = b->your_ip; 1084 ic_servaddr = server_id; 1085 pr_debug("DHCP: Offered address %pI4 by server %pI4\n", 1086 &ic_myaddr, &b->iph.saddr); 1087 /* The DHCP indicated server address takes 1088 * precedence over the bootp header one if 1089 * they are different. 1090 */ 1091 if ((server_id != NONE) && 1092 (b->server_ip != server_id)) 1093 b->server_ip = ic_servaddr; 1094 break; 1095 1096 case DHCPACK: 1097 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1098 goto drop_unlock; 1099 1100 /* Yeah! */ 1101 break; 1102 1103 default: 1104 /* Urque. Forget it*/ 1105 ic_myaddr = NONE; 1106 ic_servaddr = NONE; 1107 goto drop_unlock; 1108 } 1109 1110 ic_dhcp_msgtype = mt; 1111 1112 } 1113 #endif /* IPCONFIG_DHCP */ 1114 1115 ext = &b->exten[4]; 1116 while (ext < end && *ext != 0xff) { 1117 u8 *opt = ext++; 1118 if (*opt == 0) /* Padding */ 1119 continue; 1120 ext += *ext + 1; 1121 if (ext < end) 1122 ic_do_bootp_ext(opt); 1123 } 1124 } 1125 1126 /* We have a winner! */ 1127 ic_dev = dev; 1128 ic_myaddr = b->your_ip; 1129 ic_servaddr = b->server_ip; 1130 ic_addrservaddr = b->iph.saddr; 1131 if (ic_gateway == NONE && b->relay_ip) 1132 ic_gateway = b->relay_ip; 1133 if (ic_nameservers[0] == NONE) 1134 ic_nameservers[0] = ic_servaddr; 1135 ic_got_reply = IC_BOOTP; 1136 1137 drop_unlock: 1138 /* Show's over. Nothing to see here. */ 1139 spin_unlock(&ic_recv_lock); 1140 1141 drop: 1142 /* Throw the packet out. */ 1143 kfree_skb(skb); 1144 1145 return 0; 1146 } 1147 1148 1149 #endif 1150 1151 1152 /* 1153 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1154 */ 1155 1156 #ifdef IPCONFIG_DYNAMIC 1157 1158 static int __init ic_dynamic(void) 1159 { 1160 int retries; 1161 struct ic_device *d; 1162 unsigned long start_jiffies, timeout, jiff; 1163 int do_bootp = ic_proto_have_if & IC_BOOTP; 1164 int do_rarp = ic_proto_have_if & IC_RARP; 1165 1166 /* 1167 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1168 * This routine gets only called when some pieces of information 1169 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1170 */ 1171 if (!ic_proto_enabled) { 1172 pr_err("IP-Config: Incomplete network configuration information\n"); 1173 return -1; 1174 } 1175 1176 #ifdef IPCONFIG_BOOTP 1177 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1178 pr_err("DHCP/BOOTP: No suitable device found\n"); 1179 #endif 1180 #ifdef IPCONFIG_RARP 1181 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1182 pr_err("RARP: No suitable device found\n"); 1183 #endif 1184 1185 if (!ic_proto_have_if) 1186 /* Error message already printed */ 1187 return -1; 1188 1189 /* 1190 * Setup protocols 1191 */ 1192 #ifdef IPCONFIG_BOOTP 1193 if (do_bootp) 1194 ic_bootp_init(); 1195 #endif 1196 #ifdef IPCONFIG_RARP 1197 if (do_rarp) 1198 ic_rarp_init(); 1199 #endif 1200 1201 /* 1202 * Send requests and wait, until we get an answer. This loop 1203 * seems to be a terrible waste of CPU time, but actually there is 1204 * only one process running at all, so we don't need to use any 1205 * scheduler functions. 1206 * [Actually we could now, but the nothing else running note still 1207 * applies.. - AC] 1208 */ 1209 pr_notice("Sending %s%s%s requests .", 1210 do_bootp 1211 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1212 (do_bootp && do_rarp) ? " and " : "", 1213 do_rarp ? "RARP" : ""); 1214 1215 start_jiffies = jiffies; 1216 d = ic_first_dev; 1217 retries = CONF_SEND_RETRIES; 1218 get_random_bytes(&timeout, sizeof(timeout)); 1219 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); 1220 for (;;) { 1221 #ifdef IPCONFIG_BOOTP 1222 /* Track the device we are configuring */ 1223 ic_dev_xid = d->xid; 1224 1225 if (do_bootp && (d->able & IC_BOOTP)) 1226 ic_bootp_send_if(d, jiffies - start_jiffies); 1227 #endif 1228 #ifdef IPCONFIG_RARP 1229 if (do_rarp && (d->able & IC_RARP)) 1230 ic_rarp_send_if(d); 1231 #endif 1232 1233 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1234 while (time_before(jiffies, jiff) && !ic_got_reply) 1235 schedule_timeout_uninterruptible(1); 1236 #ifdef IPCONFIG_DHCP 1237 /* DHCP isn't done until we get a DHCPACK. */ 1238 if ((ic_got_reply & IC_BOOTP) && 1239 (ic_proto_enabled & IC_USE_DHCP) && 1240 ic_dhcp_msgtype != DHCPACK) { 1241 ic_got_reply = 0; 1242 pr_cont(","); 1243 continue; 1244 } 1245 #endif /* IPCONFIG_DHCP */ 1246 1247 if (ic_got_reply) { 1248 pr_cont(" OK\n"); 1249 break; 1250 } 1251 1252 if ((d = d->next)) 1253 continue; 1254 1255 if (! --retries) { 1256 pr_cont(" timed out!\n"); 1257 break; 1258 } 1259 1260 d = ic_first_dev; 1261 1262 timeout = timeout CONF_TIMEOUT_MULT; 1263 if (timeout > CONF_TIMEOUT_MAX) 1264 timeout = CONF_TIMEOUT_MAX; 1265 1266 pr_cont("."); 1267 } 1268 1269 #ifdef IPCONFIG_BOOTP 1270 if (do_bootp) 1271 ic_bootp_cleanup(); 1272 #endif 1273 #ifdef IPCONFIG_RARP 1274 if (do_rarp) 1275 ic_rarp_cleanup(); 1276 #endif 1277 1278 if (!ic_got_reply) { 1279 ic_myaddr = NONE; 1280 return -1; 1281 } 1282 1283 pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n", 1284 ((ic_got_reply & IC_RARP) ? "RARP" 1285 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1286 &ic_addrservaddr, &ic_myaddr); 1287 1288 return 0; 1289 } 1290 1291 #endif /* IPCONFIG_DYNAMIC */ 1292 1293 #ifdef CONFIG_PROC_FS 1294 1295 static int pnp_seq_show(struct seq_file *seq, void *v) 1296 { 1297 int i; 1298 1299 if (ic_proto_used & IC_PROTO) 1300 seq_printf(seq, "#PROTO: %s\n", 1301 (ic_proto_used & IC_RARP) ? "RARP" 1302 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1303 else 1304 seq_puts(seq, "#MANUAL\n"); 1305 1306 if (ic_domain[0]) 1307 seq_printf(seq, 1308 "domain %s\n", ic_domain); 1309 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1310 if (ic_nameservers[i] != NONE) 1311 seq_printf(seq, "nameserver %pI4\n", 1312 &ic_nameservers[i]); 1313 } 1314 if (ic_servaddr != NONE) 1315 seq_printf(seq, "bootserver %pI4\n", 1316 &ic_servaddr); 1317 return 0; 1318 } 1319 1320 static int pnp_seq_open(struct inode *indoe, struct file *file) 1321 { 1322 return single_open(file, pnp_seq_show, NULL); 1323 } 1324 1325 static const struct file_operations pnp_seq_fops = { 1326 .owner = THIS_MODULE, 1327 .open = pnp_seq_open, 1328 .read = seq_read, 1329 .llseek = seq_lseek, 1330 .release = single_release, 1331 }; 1332 #endif /* CONFIG_PROC_FS */ 1333 1334 /* 1335 * Extract IP address from the parameter string if needed. Note that we 1336 * need to have root_server_addr set _before_ IPConfig gets called as it 1337 * can override it. 1338 */ 1339 __be32 __init root_nfs_parse_addr(char *name) 1340 { 1341 __be32 addr; 1342 int octets = 0; 1343 char *cp, *cq; 1344 1345 cp = cq = name; 1346 while (octets < 4) { 1347 while (*cp >= '0' && *cp <= '9') 1348 cp++; 1349 if (cp == cq || cp - cq > 3) 1350 break; 1351 if (*cp == '.' || octets == 3) 1352 octets++; 1353 if (octets < 4) 1354 cp++; 1355 cq = cp; 1356 } 1357 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1358 if (*cp == ':') 1359 *cp++ = '\0'; 1360 addr = in_aton(name); 1361 memmove(name, cp, strlen(cp) + 1); 1362 } else 1363 addr = NONE; 1364 1365 return addr; 1366 } 1367 1368 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1369 1370 static int __init wait_for_devices(void) 1371 { 1372 int i; 1373 1374 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1375 struct net_device *dev; 1376 int found = 0; 1377 1378 rtnl_lock(); 1379 for_each_netdev(&init_net, dev) { 1380 if (ic_is_init_dev(dev)) { 1381 found = 1; 1382 break; 1383 } 1384 } 1385 rtnl_unlock(); 1386 if (found) 1387 return 0; 1388 ssleep(1); 1389 } 1390 return -ENODEV; 1391 } 1392 1393 /* 1394 * IP Autoconfig dispatcher. 1395 */ 1396 1397 static int __init ip_auto_config(void) 1398 { 1399 __be32 addr; 1400 #ifdef IPCONFIG_DYNAMIC 1401 int retries = CONF_OPEN_RETRIES; 1402 #endif 1403 int err; 1404 unsigned int i; 1405 1406 #ifdef CONFIG_PROC_FS 1407 proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops); 1408 #endif /* CONFIG_PROC_FS */ 1409 1410 if (!ic_enable) 1411 return 0; 1412 1413 pr_debug("IP-Config: Entered.\n"); 1414 #ifdef IPCONFIG_DYNAMIC 1415 try_try_again: 1416 #endif 1417 /* Wait for devices to appear */ 1418 err = wait_for_devices(); 1419 if (err) 1420 return err; 1421 1422 /* Setup all network devices */ 1423 err = ic_open_devs(); 1424 if (err) 1425 return err; 1426 1427 /* Give drivers a chance to settle */ 1428 msleep(CONF_POST_OPEN); 1429 1430 /* 1431 * If the config information is insufficient (e.g., our IP address or 1432 * IP address of the boot server is missing or we have multiple network 1433 * interfaces and no default was set), use BOOTP or RARP to get the 1434 * missing values. 1435 */ 1436 if (ic_myaddr == NONE || 1437 #ifdef CONFIG_ROOT_NFS 1438 (root_server_addr == NONE && 1439 ic_servaddr == NONE && 1440 ROOT_DEV == Root_NFS) || 1441 #endif 1442 ic_first_dev->next) { 1443 #ifdef IPCONFIG_DYNAMIC 1444 if (ic_dynamic() < 0) { 1445 ic_close_devs(); 1446 1447 /* 1448 * I don't know why, but sometimes the 1449 * eepro100 driver (at least) gets upset and 1450 * doesn't work the first time it's opened. 1451 * But then if you close it and reopen it, it 1452 * works just fine. So we need to try that at 1453 * least once before giving up. 1454 * 1455 * Also, if the root will be NFS-mounted, we 1456 * have nowhere to go if DHCP fails. So we 1457 * just have to keep trying forever. 1458 * 1459 * -- Chip 1460 */ 1461 #ifdef CONFIG_ROOT_NFS 1462 if (ROOT_DEV == Root_NFS) { 1463 pr_err("IP-Config: Retrying forever (NFS root)...\n"); 1464 goto try_try_again; 1465 } 1466 #endif 1467 1468 if (--retries) { 1469 pr_err("IP-Config: Reopening network devices...\n"); 1470 goto try_try_again; 1471 } 1472 1473 /* Oh, well. At least we tried. */ 1474 pr_err("IP-Config: Auto-configuration of network failed\n"); 1475 return -1; 1476 } 1477 #else /* !DYNAMIC */ 1478 pr_err("IP-Config: Incomplete network configuration information\n"); 1479 ic_close_devs(); 1480 return -1; 1481 #endif /* IPCONFIG_DYNAMIC */ 1482 } else { 1483 /* Device selected manually or only one device -> use it */ 1484 ic_dev = ic_first_dev->dev; 1485 } 1486 1487 addr = root_nfs_parse_addr(root_server_path); 1488 if (root_server_addr == NONE) 1489 root_server_addr = addr; 1490 1491 /* 1492 * Use defaults wherever applicable. 1493 */ 1494 if (ic_defaults() < 0) 1495 return -1; 1496 1497 /* 1498 * Close all network devices except the device we've 1499 * autoconfigured and set up routes. 1500 */ 1501 ic_close_devs(); 1502 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1503 return -1; 1504 1505 /* 1506 * Record which protocol was actually used. 1507 */ 1508 #ifdef IPCONFIG_DYNAMIC 1509 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1510 #endif 1511 1512 #ifndef IPCONFIG_SILENT 1513 /* 1514 * Clue in the operator. 1515 */ 1516 pr_info("IP-Config: Complete:\n"); 1517 1518 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", 1519 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr, 1520 &ic_myaddr, &ic_netmask, &ic_gateway); 1521 pr_info(" host=%s, domain=%s, nis-domain=%s\n", 1522 utsname()->nodename, ic_domain, utsname()->domainname); 1523 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", 1524 &ic_servaddr, &root_server_addr, root_server_path); 1525 if (ic_dev_mtu) 1526 pr_cont(", mtu=%d", ic_dev_mtu); 1527 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 1528 if (ic_nameservers[i] != NONE) { 1529 pr_cont(" nameserver%u=%pI4", 1530 i, &ic_nameservers[i]); 1531 break; 1532 } 1533 for (i++; i < CONF_NAMESERVERS_MAX; i++) 1534 if (ic_nameservers[i] != NONE) 1535 pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]); 1536 pr_cont("\n"); 1537 #endif /* !SILENT */ 1538 1539 return 0; 1540 } 1541 1542 late_initcall(ip_auto_config); 1543 1544 1545 /* 1546 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1547 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. 1548 */ 1549 static int __init ic_proto_name(char *name) 1550 { 1551 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1552 return 1; 1553 } 1554 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1555 return 0; 1556 } 1557 #ifdef CONFIG_IP_PNP_DHCP 1558 else if (!strncmp(name, "dhcp", 4)) { 1559 char *client_id; 1560 1561 ic_proto_enabled &= ~IC_RARP; 1562 client_id = strstr(name, "dhcp,"); 1563 if (client_id) { 1564 char *v; 1565 1566 client_id = client_id + 5; 1567 v = strchr(client_id, ','); 1568 if (!v) 1569 return 1; 1570 *v = 0; 1571 if (kstrtou8(client_id, 0, dhcp_client_identifier)) 1572 pr_debug("DHCP: Invalid client identifier type\n"); 1573 strncpy(dhcp_client_identifier + 1, v + 1, 251); 1574 *v = ','; 1575 } 1576 return 1; 1577 } 1578 #endif 1579 #ifdef CONFIG_IP_PNP_BOOTP 1580 else if (!strcmp(name, "bootp")) { 1581 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1582 return 1; 1583 } 1584 #endif 1585 #ifdef CONFIG_IP_PNP_RARP 1586 else if (!strcmp(name, "rarp")) { 1587 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1588 return 1; 1589 } 1590 #endif 1591 #ifdef IPCONFIG_DYNAMIC 1592 else if (!strcmp(name, "both")) { 1593 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1594 return 1; 1595 } 1596 #endif 1597 return 0; 1598 } 1599 1600 static int __init ip_auto_config_setup(char *addrs) 1601 { 1602 char *cp, *ip, *dp; 1603 int num = 0; 1604 1605 ic_set_manually = 1; 1606 ic_enable = 1; 1607 1608 /* 1609 * If any dhcp, bootp etc options are set, leave autoconfig on 1610 * and skip the below static IP processing. 1611 */ 1612 if (ic_proto_name(addrs)) 1613 return 1; 1614 1615 /* If no static IP is given, turn off autoconfig and bail. */ 1616 if (*addrs == 0 || 1617 strcmp(addrs, "off") == 0 || 1618 strcmp(addrs, "none") == 0) { 1619 ic_enable = 0; 1620 return 1; 1621 } 1622 1623 ic_nameservers_predef(); 1624 1625 /* Parse string for static IP assignment. */ 1626 ip = addrs; 1627 while (ip && *ip) { 1628 if ((cp = strchr(ip, ':'))) 1629 *cp++ = '\0'; 1630 if (strlen(ip) > 0) { 1631 pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip); 1632 switch (num) { 1633 case 0: 1634 if ((ic_myaddr = in_aton(ip)) == ANY) 1635 ic_myaddr = NONE; 1636 break; 1637 case 1: 1638 if ((ic_servaddr = in_aton(ip)) == ANY) 1639 ic_servaddr = NONE; 1640 break; 1641 case 2: 1642 if ((ic_gateway = in_aton(ip)) == ANY) 1643 ic_gateway = NONE; 1644 break; 1645 case 3: 1646 if ((ic_netmask = in_aton(ip)) == ANY) 1647 ic_netmask = NONE; 1648 break; 1649 case 4: 1650 if ((dp = strchr(ip, '.'))) { 1651 *dp++ = '\0'; 1652 strlcpy(utsname()->domainname, dp, 1653 sizeof(utsname()->domainname)); 1654 } 1655 strlcpy(utsname()->nodename, ip, 1656 sizeof(utsname()->nodename)); 1657 ic_host_name_set = 1; 1658 break; 1659 case 5: 1660 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1661 break; 1662 case 6: 1663 if (ic_proto_name(ip) == 0 && 1664 ic_myaddr == NONE) { 1665 ic_enable = 0; 1666 } 1667 break; 1668 case 7: 1669 if (CONF_NAMESERVERS_MAX >= 1) { 1670 ic_nameservers[0] = in_aton(ip); 1671 if (ic_nameservers[0] == ANY) 1672 ic_nameservers[0] = NONE; 1673 } 1674 break; 1675 case 8: 1676 if (CONF_NAMESERVERS_MAX >= 2) { 1677 ic_nameservers[1] = in_aton(ip); 1678 if (ic_nameservers[1] == ANY) 1679 ic_nameservers[1] = NONE; 1680 } 1681 break; 1682 } 1683 } 1684 ip = cp; 1685 num++; 1686 } 1687 1688 return 1; 1689 } 1690 __setup("ip=", ip_auto_config_setup); 1691 1692 static int __init nfsaddrs_config_setup(char *addrs) 1693 { 1694 return ip_auto_config_setup(addrs); 1695 } 1696 __setup("nfsaddrs=", nfsaddrs_config_setup); 1697 1698 static int __init vendor_class_identifier_setup(char *addrs) 1699 { 1700 if (strlcpy(vendor_class_identifier, addrs, 1701 sizeof(vendor_class_identifier)) 1702 >= sizeof(vendor_class_identifier)) 1703 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n", 1704 vendor_class_identifier); 1705 return 1; 1706 } 1707 __setup("dhcpclass=", vendor_class_identifier_setup); 1708