1 /* 2 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or 3 * user-supplied information to configure own IP address and routes. 4 * 5 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz> 6 * 7 * Derived from network configuration code in fs/nfs/nfsroot.c, 8 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me. 9 * 10 * BOOTP rewritten to construct and analyse packets itself instead 11 * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--; 12 * -- MJ, December 1998 13 * 14 * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic" 15 * initialization scheme. 16 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999 17 * 18 * DHCP support added. To users this looks like a whole separate 19 * protocol, but we know it's just a bag on the side of BOOTP. 20 * -- Chip Salzenberg <chip@valinux.com>, May 2000 21 * 22 * Ported DHCP support from 2.2.16 to 2.4.0-test4 23 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000 24 * 25 * Merged changes from 2.2.19 into 2.4.3 26 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001 27 * 28 * Multiple Nameservers in /proc/net/pnp 29 * -- Josef Siemes <jsiemes@web.de>, Aug 2002 30 */ 31 32 #include <linux/types.h> 33 #include <linux/string.h> 34 #include <linux/kernel.h> 35 #include <linux/jiffies.h> 36 #include <linux/random.h> 37 #include <linux/init.h> 38 #include <linux/utsname.h> 39 #include <linux/in.h> 40 #include <linux/if.h> 41 #include <linux/inet.h> 42 #include <linux/inetdevice.h> 43 #include <linux/netdevice.h> 44 #include <linux/if_arp.h> 45 #include <linux/skbuff.h> 46 #include <linux/ip.h> 47 #include <linux/socket.h> 48 #include <linux/route.h> 49 #include <linux/udp.h> 50 #include <linux/proc_fs.h> 51 #include <linux/seq_file.h> 52 #include <linux/major.h> 53 #include <linux/root_dev.h> 54 #include <linux/delay.h> 55 #include <linux/nfs_fs.h> 56 #include <linux/slab.h> 57 #include <linux/export.h> 58 #include <net/net_namespace.h> 59 #include <net/arp.h> 60 #include <net/ip.h> 61 #include <net/ipconfig.h> 62 #include <net/route.h> 63 64 #include <asm/uaccess.h> 65 #include <net/checksum.h> 66 #include <asm/processor.h> 67 68 /* Define this to allow debugging output */ 69 #undef IPCONFIG_DEBUG 70 71 #ifdef IPCONFIG_DEBUG 72 #define DBG(x) printk x 73 #else 74 #define DBG(x) do { } while(0) 75 #endif 76 77 #if defined(CONFIG_IP_PNP_DHCP) 78 #define IPCONFIG_DHCP 79 #endif 80 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) 81 #define IPCONFIG_BOOTP 82 #endif 83 #if defined(CONFIG_IP_PNP_RARP) 84 #define IPCONFIG_RARP 85 #endif 86 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) 87 #define IPCONFIG_DYNAMIC 88 #endif 89 90 /* Define the friendly delay before and after opening net devices */ 91 #define CONF_POST_OPEN 10 /* After opening: 10 msecs */ 92 #define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */ 93 94 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ 95 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ 96 #define CONF_SEND_RETRIES 6 /* Send six requests per open */ 97 #define CONF_INTER_TIMEOUT (HZ) /* Inter-device timeout: 1 second */ 98 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ 99 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ 100 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ 101 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ 102 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers 103 - '3' from resolv.h */ 104 105 #define NONE cpu_to_be32(INADDR_NONE) 106 #define ANY cpu_to_be32(INADDR_ANY) 107 108 /* 109 * Public IP configuration 110 */ 111 112 /* This is used by platforms which might be able to set the ipconfig 113 * variables using firmware environment vars. If this is set, it will 114 * ignore such firmware variables. 115 */ 116 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ 117 118 static int ic_enable __initdata; /* IP config enabled? */ 119 120 /* Protocol choice */ 121 int ic_proto_enabled __initdata = 0 122 #ifdef IPCONFIG_BOOTP 123 | IC_BOOTP 124 #endif 125 #ifdef CONFIG_IP_PNP_DHCP 126 | IC_USE_DHCP 127 #endif 128 #ifdef IPCONFIG_RARP 129 | IC_RARP 130 #endif 131 ; 132 133 static int ic_host_name_set __initdata; /* Host name set by us? */ 134 135 __be32 ic_myaddr = NONE; /* My IP address */ 136 static __be32 ic_netmask = NONE; /* Netmask for local subnet */ 137 __be32 ic_gateway = NONE; /* Gateway IP address */ 138 139 __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */ 140 141 __be32 ic_servaddr = NONE; /* Boot server IP address */ 142 143 __be32 root_server_addr = NONE; /* Address of NFS server */ 144 u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 145 146 /* vendor class identifier */ 147 static char vendor_class_identifier[253] __initdata; 148 149 #if defined(CONFIG_IP_PNP_DHCP) 150 static char dhcp_client_identifier[253] __initdata; 151 #endif 152 153 /* Persistent data: */ 154 155 static int ic_proto_used; /* Protocol used, if any */ 156 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 157 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 158 159 /* 160 * Private state. 161 */ 162 163 /* Name of user-selected boot device */ 164 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 165 166 /* Protocols supported by available interfaces */ 167 static int ic_proto_have_if __initdata; 168 169 /* MTU for boot device */ 170 static int ic_dev_mtu __initdata; 171 172 #ifdef IPCONFIG_DYNAMIC 173 static DEFINE_SPINLOCK(ic_recv_lock); 174 static volatile int ic_got_reply __initdata; /* Proto(s) that replied */ 175 #endif 176 #ifdef IPCONFIG_DHCP 177 static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */ 178 #endif 179 180 181 /* 182 * Network devices 183 */ 184 185 struct ic_device { 186 struct ic_device *next; 187 struct net_device *dev; 188 unsigned short flags; 189 short able; 190 __be32 xid; 191 }; 192 193 static struct ic_device *ic_first_dev __initdata; /* List of open device */ 194 static struct net_device *ic_dev __initdata; /* Selected device */ 195 196 static bool __init ic_is_init_dev(struct net_device *dev) 197 { 198 if (dev->flags & IFF_LOOPBACK) 199 return false; 200 return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 201 (!(dev->flags & IFF_LOOPBACK) && 202 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 203 strncmp(dev->name, "dummy", 5)); 204 } 205 206 static int __init ic_open_devs(void) 207 { 208 struct ic_device *d, **last; 209 struct net_device *dev; 210 unsigned short oflags; 211 unsigned long start, next_msg; 212 213 last = &ic_first_dev; 214 rtnl_lock(); 215 216 /* bring loopback and DSA master network devices up first */ 217 for_each_netdev(&init_net, dev) { 218 if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev)) 219 continue; 220 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) 221 pr_err("IP-Config: Failed to open %s\n", dev->name); 222 } 223 224 for_each_netdev(&init_net, dev) { 225 if (ic_is_init_dev(dev)) { 226 int able = 0; 227 if (dev->mtu >= 364) 228 able |= IC_BOOTP; 229 else 230 pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small", 231 dev->name, dev->mtu); 232 if (!(dev->flags & IFF_NOARP)) 233 able |= IC_RARP; 234 able &= ic_proto_enabled; 235 if (ic_proto_enabled && !able) 236 continue; 237 oflags = dev->flags; 238 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 239 pr_err("IP-Config: Failed to open %s\n", 240 dev->name); 241 continue; 242 } 243 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 244 rtnl_unlock(); 245 return -ENOMEM; 246 } 247 d->dev = dev; 248 *last = d; 249 last = &d->next; 250 d->flags = oflags; 251 d->able = able; 252 if (able & IC_BOOTP) 253 get_random_bytes(&d->xid, sizeof(__be32)); 254 else 255 d->xid = 0; 256 ic_proto_have_if |= able; 257 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", 258 dev->name, able, d->xid)); 259 } 260 } 261 262 /* no point in waiting if we could not bring up at least one device */ 263 if (!ic_first_dev) 264 goto have_carrier; 265 266 /* wait for a carrier on at least one device */ 267 start = jiffies; 268 next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12); 269 while (time_before(jiffies, start + 270 msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) { 271 int wait, elapsed; 272 273 for_each_netdev(&init_net, dev) 274 if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) 275 goto have_carrier; 276 277 msleep(1); 278 279 if (time_before(jiffies, next_msg)) 280 continue; 281 282 elapsed = jiffies_to_msecs(jiffies - start); 283 wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000; 284 pr_info("Waiting up to %d more seconds for network.\n", wait); 285 next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12); 286 } 287 have_carrier: 288 rtnl_unlock(); 289 290 *last = NULL; 291 292 if (!ic_first_dev) { 293 if (user_dev_name[0]) 294 pr_err("IP-Config: Device `%s' not found\n", 295 user_dev_name); 296 else 297 pr_err("IP-Config: No network devices available\n"); 298 return -ENODEV; 299 } 300 return 0; 301 } 302 303 static void __init ic_close_devs(void) 304 { 305 struct ic_device *d, *next; 306 struct net_device *dev; 307 308 rtnl_lock(); 309 next = ic_first_dev; 310 while ((d = next)) { 311 next = d->next; 312 dev = d->dev; 313 if (dev != ic_dev && !netdev_uses_dsa(dev)) { 314 DBG(("IP-Config: Downing %s\n", dev->name)); 315 dev_change_flags(dev, d->flags); 316 } 317 kfree(d); 318 } 319 rtnl_unlock(); 320 } 321 322 /* 323 * Interface to various network functions. 324 */ 325 326 static inline void 327 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 328 { 329 sin->sin_family = AF_INET; 330 sin->sin_addr.s_addr = addr; 331 sin->sin_port = port; 332 } 333 334 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg) 335 { 336 int res; 337 338 mm_segment_t oldfs = get_fs(); 339 set_fs(get_ds()); 340 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 341 set_fs(oldfs); 342 return res; 343 } 344 345 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 346 { 347 int res; 348 349 mm_segment_t oldfs = get_fs(); 350 set_fs(get_ds()); 351 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 352 set_fs(oldfs); 353 return res; 354 } 355 356 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 357 { 358 int res; 359 360 mm_segment_t oldfs = get_fs(); 361 set_fs(get_ds()); 362 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); 363 set_fs(oldfs); 364 return res; 365 } 366 367 /* 368 * Set up interface addresses and routes. 369 */ 370 371 static int __init ic_setup_if(void) 372 { 373 struct ifreq ir; 374 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 375 int err; 376 377 memset(&ir, 0, sizeof(ir)); 378 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); 379 set_sockaddr(sin, ic_myaddr, 0); 380 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) { 381 pr_err("IP-Config: Unable to set interface address (%d)\n", 382 err); 383 return -1; 384 } 385 set_sockaddr(sin, ic_netmask, 0); 386 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 387 pr_err("IP-Config: Unable to set interface netmask (%d)\n", 388 err); 389 return -1; 390 } 391 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 392 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 393 pr_err("IP-Config: Unable to set interface broadcast address (%d)\n", 394 err); 395 return -1; 396 } 397 /* Handle the case where we need non-standard MTU on the boot link (a network 398 * using jumbo frames, for instance). If we can't set the mtu, don't error 399 * out, we'll try to muddle along. 400 */ 401 if (ic_dev_mtu != 0) { 402 strcpy(ir.ifr_name, ic_dev->name); 403 ir.ifr_mtu = ic_dev_mtu; 404 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0) 405 pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", 406 ic_dev_mtu, err); 407 } 408 return 0; 409 } 410 411 static int __init ic_setup_routes(void) 412 { 413 /* No need to setup device routes, only the default route... */ 414 415 if (ic_gateway != NONE) { 416 struct rtentry rm; 417 int err; 418 419 memset(&rm, 0, sizeof(rm)); 420 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 421 pr_err("IP-Config: Gateway not on directly connected network\n"); 422 return -1; 423 } 424 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 425 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 426 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 427 rm.rt_flags = RTF_UP | RTF_GATEWAY; 428 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 429 pr_err("IP-Config: Cannot add default route (%d)\n", 430 err); 431 return -1; 432 } 433 } 434 435 return 0; 436 } 437 438 /* 439 * Fill in default values for all missing parameters. 440 */ 441 442 static int __init ic_defaults(void) 443 { 444 /* 445 * At this point we have no userspace running so need not 446 * claim locks on system_utsname 447 */ 448 449 if (!ic_host_name_set) 450 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 451 452 if (root_server_addr == NONE) 453 root_server_addr = ic_servaddr; 454 455 if (ic_netmask == NONE) { 456 if (IN_CLASSA(ntohl(ic_myaddr))) 457 ic_netmask = htonl(IN_CLASSA_NET); 458 else if (IN_CLASSB(ntohl(ic_myaddr))) 459 ic_netmask = htonl(IN_CLASSB_NET); 460 else if (IN_CLASSC(ntohl(ic_myaddr))) 461 ic_netmask = htonl(IN_CLASSC_NET); 462 else { 463 pr_err("IP-Config: Unable to guess netmask for address %pI4\n", 464 &ic_myaddr); 465 return -1; 466 } 467 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask); 468 } 469 470 return 0; 471 } 472 473 /* 474 * RARP support. 475 */ 476 477 #ifdef IPCONFIG_RARP 478 479 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 480 481 static struct packet_type rarp_packet_type __initdata = { 482 .type = cpu_to_be16(ETH_P_RARP), 483 .func = ic_rarp_recv, 484 }; 485 486 static inline void __init ic_rarp_init(void) 487 { 488 dev_add_pack(&rarp_packet_type); 489 } 490 491 static inline void __init ic_rarp_cleanup(void) 492 { 493 dev_remove_pack(&rarp_packet_type); 494 } 495 496 /* 497 * Process received RARP packet. 498 */ 499 static int __init 500 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 501 { 502 struct arphdr *rarp; 503 unsigned char *rarp_ptr; 504 __be32 sip, tip; 505 unsigned char *tha; /* t for "target" */ 506 struct ic_device *d; 507 508 if (!net_eq(dev_net(dev), &init_net)) 509 goto drop; 510 511 skb = skb_share_check(skb, GFP_ATOMIC); 512 if (!skb) 513 return NET_RX_DROP; 514 515 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 516 goto drop; 517 518 /* Basic sanity checks can be done without the lock. */ 519 rarp = (struct arphdr *)skb_transport_header(skb); 520 521 /* If this test doesn't pass, it's not IP, or we should 522 * ignore it anyway. 523 */ 524 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 525 goto drop; 526 527 /* If it's not a RARP reply, delete it. */ 528 if (rarp->ar_op != htons(ARPOP_RREPLY)) 529 goto drop; 530 531 /* If it's not Ethernet, delete it. */ 532 if (rarp->ar_pro != htons(ETH_P_IP)) 533 goto drop; 534 535 if (!pskb_may_pull(skb, arp_hdr_len(dev))) 536 goto drop; 537 538 /* OK, it is all there and looks valid, process... */ 539 rarp = (struct arphdr *)skb_transport_header(skb); 540 rarp_ptr = (unsigned char *) (rarp + 1); 541 542 /* One reply at a time, please. */ 543 spin_lock(&ic_recv_lock); 544 545 /* If we already have a reply, just drop the packet */ 546 if (ic_got_reply) 547 goto drop_unlock; 548 549 /* Find the ic_device that the packet arrived on */ 550 d = ic_first_dev; 551 while (d && d->dev != dev) 552 d = d->next; 553 if (!d) 554 goto drop_unlock; /* should never happen */ 555 556 /* Extract variable-width fields */ 557 rarp_ptr += dev->addr_len; 558 memcpy(&sip, rarp_ptr, 4); 559 rarp_ptr += 4; 560 tha = rarp_ptr; 561 rarp_ptr += dev->addr_len; 562 memcpy(&tip, rarp_ptr, 4); 563 564 /* Discard packets which are not meant for us. */ 565 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 566 goto drop_unlock; 567 568 /* Discard packets which are not from specified server. */ 569 if (ic_servaddr != NONE && ic_servaddr != sip) 570 goto drop_unlock; 571 572 /* We have a winner! */ 573 ic_dev = dev; 574 if (ic_myaddr == NONE) 575 ic_myaddr = tip; 576 ic_servaddr = sip; 577 ic_addrservaddr = sip; 578 ic_got_reply = IC_RARP; 579 580 drop_unlock: 581 /* Show's over. Nothing to see here. */ 582 spin_unlock(&ic_recv_lock); 583 584 drop: 585 /* Throw the packet out. */ 586 kfree_skb(skb); 587 return 0; 588 } 589 590 591 /* 592 * Send RARP request packet over a single interface. 593 */ 594 static void __init ic_rarp_send_if(struct ic_device *d) 595 { 596 struct net_device *dev = d->dev; 597 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 598 dev->dev_addr, dev->dev_addr); 599 } 600 #endif 601 602 /* 603 * Predefine Nameservers 604 */ 605 static inline void __init ic_nameservers_predef(void) 606 { 607 int i; 608 609 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 610 ic_nameservers[i] = NONE; 611 } 612 613 /* 614 * DHCP/BOOTP support. 615 */ 616 617 #ifdef IPCONFIG_BOOTP 618 619 struct bootp_pkt { /* BOOTP packet format */ 620 struct iphdr iph; /* IP header */ 621 struct udphdr udph; /* UDP header */ 622 u8 op; /* 1=request, 2=reply */ 623 u8 htype; /* HW address type */ 624 u8 hlen; /* HW address length */ 625 u8 hops; /* Used only by gateways */ 626 __be32 xid; /* Transaction ID */ 627 __be16 secs; /* Seconds since we started */ 628 __be16 flags; /* Just what it says */ 629 __be32 client_ip; /* Client's IP address if known */ 630 __be32 your_ip; /* Assigned IP address */ 631 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 632 __be32 relay_ip; /* IP address of BOOTP relay */ 633 u8 hw_addr[16]; /* Client's HW address */ 634 u8 serv_name[64]; /* Server host name */ 635 u8 boot_file[128]; /* Name of boot file */ 636 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 637 }; 638 639 /* packet ops */ 640 #define BOOTP_REQUEST 1 641 #define BOOTP_REPLY 2 642 643 /* DHCP message types */ 644 #define DHCPDISCOVER 1 645 #define DHCPOFFER 2 646 #define DHCPREQUEST 3 647 #define DHCPDECLINE 4 648 #define DHCPACK 5 649 #define DHCPNAK 6 650 #define DHCPRELEASE 7 651 #define DHCPINFORM 8 652 653 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 654 655 static struct packet_type bootp_packet_type __initdata = { 656 .type = cpu_to_be16(ETH_P_IP), 657 .func = ic_bootp_recv, 658 }; 659 660 static __be32 ic_dev_xid; /* Device under configuration */ 661 662 /* 663 * Initialize DHCP/BOOTP extension fields in the request. 664 */ 665 666 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 667 668 #ifdef IPCONFIG_DHCP 669 670 static void __init 671 ic_dhcp_init_options(u8 *options) 672 { 673 u8 mt = ((ic_servaddr == NONE) 674 ? DHCPDISCOVER : DHCPREQUEST); 675 u8 *e = options; 676 int len; 677 678 #ifdef IPCONFIG_DEBUG 679 printk("DHCP: Sending message type %d\n", mt); 680 #endif 681 682 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 683 e += 4; 684 685 *e++ = 53; /* DHCP message type */ 686 *e++ = 1; 687 *e++ = mt; 688 689 if (mt == DHCPREQUEST) { 690 *e++ = 54; /* Server ID (IP address) */ 691 *e++ = 4; 692 memcpy(e, &ic_servaddr, 4); 693 e += 4; 694 695 *e++ = 50; /* Requested IP address */ 696 *e++ = 4; 697 memcpy(e, &ic_myaddr, 4); 698 e += 4; 699 } 700 701 /* always? */ 702 { 703 static const u8 ic_req_params[] = { 704 1, /* Subnet mask */ 705 3, /* Default gateway */ 706 6, /* DNS server */ 707 12, /* Host name */ 708 15, /* Domain name */ 709 17, /* Boot path */ 710 26, /* MTU */ 711 40, /* NIS domain name */ 712 }; 713 714 *e++ = 55; /* Parameter request list */ 715 *e++ = sizeof(ic_req_params); 716 memcpy(e, ic_req_params, sizeof(ic_req_params)); 717 e += sizeof(ic_req_params); 718 719 if (ic_host_name_set) { 720 *e++ = 12; /* host-name */ 721 len = strlen(utsname()->nodename); 722 *e++ = len; 723 memcpy(e, utsname()->nodename, len); 724 e += len; 725 } 726 if (*vendor_class_identifier) { 727 pr_info("DHCP: sending class identifier \"%s\"\n", 728 vendor_class_identifier); 729 *e++ = 60; /* Class-identifier */ 730 len = strlen(vendor_class_identifier); 731 *e++ = len; 732 memcpy(e, vendor_class_identifier, len); 733 e += len; 734 } 735 len = strlen(dhcp_client_identifier + 1); 736 /* the minimum length of identifier is 2, include 1 byte type, 737 * and can not be larger than the length of options 738 */ 739 if (len >= 1 && len < 312 - (e - options) - 1) { 740 *e++ = 61; 741 *e++ = len + 1; 742 memcpy(e, dhcp_client_identifier, len + 1); 743 e += len + 1; 744 } 745 } 746 747 *e++ = 255; /* End of the list */ 748 } 749 750 #endif /* IPCONFIG_DHCP */ 751 752 static void __init ic_bootp_init_ext(u8 *e) 753 { 754 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 755 e += 4; 756 *e++ = 1; /* Subnet mask request */ 757 *e++ = 4; 758 e += 4; 759 *e++ = 3; /* Default gateway request */ 760 *e++ = 4; 761 e += 4; 762 *e++ = 5; /* Name server request */ 763 *e++ = 8; 764 e += 8; 765 *e++ = 12; /* Host name request */ 766 *e++ = 32; 767 e += 32; 768 *e++ = 40; /* NIS Domain name request */ 769 *e++ = 32; 770 e += 32; 771 *e++ = 17; /* Boot path */ 772 *e++ = 40; 773 e += 40; 774 775 *e++ = 57; /* set extension buffer size for reply */ 776 *e++ = 2; 777 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 778 *e++ = 150; 779 780 *e++ = 255; /* End of the list */ 781 } 782 783 784 /* 785 * Initialize the DHCP/BOOTP mechanism. 786 */ 787 static inline void __init ic_bootp_init(void) 788 { 789 ic_nameservers_predef(); 790 791 dev_add_pack(&bootp_packet_type); 792 } 793 794 795 /* 796 * DHCP/BOOTP cleanup. 797 */ 798 static inline void __init ic_bootp_cleanup(void) 799 { 800 dev_remove_pack(&bootp_packet_type); 801 } 802 803 804 /* 805 * Send DHCP/BOOTP request to single interface. 806 */ 807 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 808 { 809 struct net_device *dev = d->dev; 810 struct sk_buff *skb; 811 struct bootp_pkt *b; 812 struct iphdr *h; 813 int hlen = LL_RESERVED_SPACE(dev); 814 int tlen = dev->needed_tailroom; 815 816 /* Allocate packet */ 817 skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15, 818 GFP_KERNEL); 819 if (!skb) 820 return; 821 skb_reserve(skb, hlen); 822 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 823 memset(b, 0, sizeof(struct bootp_pkt)); 824 825 /* Construct IP header */ 826 skb_reset_network_header(skb); 827 h = ip_hdr(skb); 828 h->version = 4; 829 h->ihl = 5; 830 h->tot_len = htons(sizeof(struct bootp_pkt)); 831 h->frag_off = htons(IP_DF); 832 h->ttl = 64; 833 h->protocol = IPPROTO_UDP; 834 h->daddr = htonl(INADDR_BROADCAST); 835 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 836 837 /* Construct UDP header */ 838 b->udph.source = htons(68); 839 b->udph.dest = htons(67); 840 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 841 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 842 843 /* Construct DHCP/BOOTP header */ 844 b->op = BOOTP_REQUEST; 845 if (dev->type < 256) /* check for false types */ 846 b->htype = dev->type; 847 else if (dev->type == ARPHRD_FDDI) 848 b->htype = ARPHRD_ETHER; 849 else { 850 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 851 b->htype = dev->type; /* can cause undefined behavior */ 852 } 853 854 /* server_ip and your_ip address are both already zero per RFC2131 */ 855 b->hlen = dev->addr_len; 856 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 857 b->secs = htons(jiffies_diff / HZ); 858 b->xid = d->xid; 859 860 /* add DHCP options or BOOTP extensions */ 861 #ifdef IPCONFIG_DHCP 862 if (ic_proto_enabled & IC_USE_DHCP) 863 ic_dhcp_init_options(b->exten); 864 else 865 #endif 866 ic_bootp_init_ext(b->exten); 867 868 /* Chain packet down the line... */ 869 skb->dev = dev; 870 skb->protocol = htons(ETH_P_IP); 871 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 872 dev->broadcast, dev->dev_addr, skb->len) < 0) { 873 kfree_skb(skb); 874 printk("E"); 875 return; 876 } 877 878 if (dev_queue_xmit(skb) < 0) 879 printk("E"); 880 } 881 882 883 /* 884 * Copy BOOTP-supplied string if not already set. 885 */ 886 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 887 { 888 if (!len) 889 return 0; 890 if (len > max-1) 891 len = max-1; 892 memcpy(dest, src, len); 893 dest[len] = '\0'; 894 return 1; 895 } 896 897 898 /* 899 * Process BOOTP extensions. 900 */ 901 static void __init ic_do_bootp_ext(u8 *ext) 902 { 903 u8 servers; 904 int i; 905 __be16 mtu; 906 907 #ifdef IPCONFIG_DEBUG 908 u8 *c; 909 910 printk("DHCP/BOOTP: Got extension %d:",*ext); 911 for (c=ext+2; c<ext+2+ext[1]; c++) 912 printk(" %02x", *c); 913 printk("\n"); 914 #endif 915 916 switch (*ext++) { 917 case 1: /* Subnet mask */ 918 if (ic_netmask == NONE) 919 memcpy(&ic_netmask, ext+1, 4); 920 break; 921 case 3: /* Default gateway */ 922 if (ic_gateway == NONE) 923 memcpy(&ic_gateway, ext+1, 4); 924 break; 925 case 6: /* DNS server */ 926 servers= *ext/4; 927 if (servers > CONF_NAMESERVERS_MAX) 928 servers = CONF_NAMESERVERS_MAX; 929 for (i = 0; i < servers; i++) { 930 if (ic_nameservers[i] == NONE) 931 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 932 } 933 break; 934 case 12: /* Host name */ 935 ic_bootp_string(utsname()->nodename, ext+1, *ext, 936 __NEW_UTS_LEN); 937 ic_host_name_set = 1; 938 break; 939 case 15: /* Domain name (DNS) */ 940 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 941 break; 942 case 17: /* Root path */ 943 if (!root_server_path[0]) 944 ic_bootp_string(root_server_path, ext+1, *ext, 945 sizeof(root_server_path)); 946 break; 947 case 26: /* Interface MTU */ 948 memcpy(&mtu, ext+1, sizeof(mtu)); 949 ic_dev_mtu = ntohs(mtu); 950 break; 951 case 40: /* NIS Domain name (_not_ DNS) */ 952 ic_bootp_string(utsname()->domainname, ext+1, *ext, 953 __NEW_UTS_LEN); 954 break; 955 } 956 } 957 958 959 /* 960 * Receive BOOTP reply. 961 */ 962 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 963 { 964 struct bootp_pkt *b; 965 struct iphdr *h; 966 struct ic_device *d; 967 int len, ext_len; 968 969 if (!net_eq(dev_net(dev), &init_net)) 970 goto drop; 971 972 /* Perform verifications before taking the lock. */ 973 if (skb->pkt_type == PACKET_OTHERHOST) 974 goto drop; 975 976 skb = skb_share_check(skb, GFP_ATOMIC); 977 if (!skb) 978 return NET_RX_DROP; 979 980 if (!pskb_may_pull(skb, 981 sizeof(struct iphdr) + 982 sizeof(struct udphdr))) 983 goto drop; 984 985 b = (struct bootp_pkt *)skb_network_header(skb); 986 h = &b->iph; 987 988 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 989 goto drop; 990 991 /* Fragments are not supported */ 992 if (ip_is_fragment(h)) { 993 net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n"); 994 goto drop; 995 } 996 997 if (skb->len < ntohs(h->tot_len)) 998 goto drop; 999 1000 if (ip_fast_csum((char *) h, h->ihl)) 1001 goto drop; 1002 1003 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 1004 goto drop; 1005 1006 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 1007 goto drop; 1008 1009 len = ntohs(b->udph.len) - sizeof(struct udphdr); 1010 ext_len = len - (sizeof(*b) - 1011 sizeof(struct iphdr) - 1012 sizeof(struct udphdr) - 1013 sizeof(b->exten)); 1014 if (ext_len < 0) 1015 goto drop; 1016 1017 /* Ok the front looks good, make sure we can get at the rest. */ 1018 if (!pskb_may_pull(skb, skb->len)) 1019 goto drop; 1020 1021 b = (struct bootp_pkt *)skb_network_header(skb); 1022 h = &b->iph; 1023 1024 /* One reply at a time, please. */ 1025 spin_lock(&ic_recv_lock); 1026 1027 /* If we already have a reply, just drop the packet */ 1028 if (ic_got_reply) 1029 goto drop_unlock; 1030 1031 /* Find the ic_device that the packet arrived on */ 1032 d = ic_first_dev; 1033 while (d && d->dev != dev) 1034 d = d->next; 1035 if (!d) 1036 goto drop_unlock; /* should never happen */ 1037 1038 /* Is it a reply to our BOOTP request? */ 1039 if (b->op != BOOTP_REPLY || 1040 b->xid != d->xid) { 1041 net_err_ratelimited("DHCP/BOOTP: Reply not for us, op[%x] xid[%x]\n", 1042 b->op, b->xid); 1043 goto drop_unlock; 1044 } 1045 1046 /* Is it a reply for the device we are configuring? */ 1047 if (b->xid != ic_dev_xid) { 1048 net_err_ratelimited("DHCP/BOOTP: Ignoring delayed packet\n"); 1049 goto drop_unlock; 1050 } 1051 1052 /* Parse extensions */ 1053 if (ext_len >= 4 && 1054 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 1055 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 1056 u8 *ext; 1057 1058 #ifdef IPCONFIG_DHCP 1059 if (ic_proto_enabled & IC_USE_DHCP) { 1060 __be32 server_id = NONE; 1061 int mt = 0; 1062 1063 ext = &b->exten[4]; 1064 while (ext < end && *ext != 0xff) { 1065 u8 *opt = ext++; 1066 if (*opt == 0) /* Padding */ 1067 continue; 1068 ext += *ext + 1; 1069 if (ext >= end) 1070 break; 1071 switch (*opt) { 1072 case 53: /* Message type */ 1073 if (opt[1]) 1074 mt = opt[2]; 1075 break; 1076 case 54: /* Server ID (IP address) */ 1077 if (opt[1] >= 4) 1078 memcpy(&server_id, opt + 2, 4); 1079 break; 1080 } 1081 } 1082 1083 #ifdef IPCONFIG_DEBUG 1084 printk("DHCP: Got message type %d\n", mt); 1085 #endif 1086 1087 switch (mt) { 1088 case DHCPOFFER: 1089 /* While in the process of accepting one offer, 1090 * ignore all others. 1091 */ 1092 if (ic_myaddr != NONE) 1093 goto drop_unlock; 1094 1095 /* Let's accept that offer. */ 1096 ic_myaddr = b->your_ip; 1097 ic_servaddr = server_id; 1098 #ifdef IPCONFIG_DEBUG 1099 printk("DHCP: Offered address %pI4 by server %pI4\n", 1100 &ic_myaddr, &b->iph.saddr); 1101 #endif 1102 /* The DHCP indicated server address takes 1103 * precedence over the bootp header one if 1104 * they are different. 1105 */ 1106 if ((server_id != NONE) && 1107 (b->server_ip != server_id)) 1108 b->server_ip = ic_servaddr; 1109 break; 1110 1111 case DHCPACK: 1112 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1113 goto drop_unlock; 1114 1115 /* Yeah! */ 1116 break; 1117 1118 default: 1119 /* Urque. Forget it*/ 1120 ic_myaddr = NONE; 1121 ic_servaddr = NONE; 1122 goto drop_unlock; 1123 } 1124 1125 ic_dhcp_msgtype = mt; 1126 1127 } 1128 #endif /* IPCONFIG_DHCP */ 1129 1130 ext = &b->exten[4]; 1131 while (ext < end && *ext != 0xff) { 1132 u8 *opt = ext++; 1133 if (*opt == 0) /* Padding */ 1134 continue; 1135 ext += *ext + 1; 1136 if (ext < end) 1137 ic_do_bootp_ext(opt); 1138 } 1139 } 1140 1141 /* We have a winner! */ 1142 ic_dev = dev; 1143 ic_myaddr = b->your_ip; 1144 ic_servaddr = b->server_ip; 1145 ic_addrservaddr = b->iph.saddr; 1146 if (ic_gateway == NONE && b->relay_ip) 1147 ic_gateway = b->relay_ip; 1148 if (ic_nameservers[0] == NONE) 1149 ic_nameservers[0] = ic_servaddr; 1150 ic_got_reply = IC_BOOTP; 1151 1152 drop_unlock: 1153 /* Show's over. Nothing to see here. */ 1154 spin_unlock(&ic_recv_lock); 1155 1156 drop: 1157 /* Throw the packet out. */ 1158 kfree_skb(skb); 1159 1160 return 0; 1161 } 1162 1163 1164 #endif 1165 1166 1167 /* 1168 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1169 */ 1170 1171 #ifdef IPCONFIG_DYNAMIC 1172 1173 static int __init ic_dynamic(void) 1174 { 1175 int retries; 1176 struct ic_device *d; 1177 unsigned long start_jiffies, timeout, jiff; 1178 int do_bootp = ic_proto_have_if & IC_BOOTP; 1179 int do_rarp = ic_proto_have_if & IC_RARP; 1180 1181 /* 1182 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1183 * This routine gets only called when some pieces of information 1184 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1185 */ 1186 if (!ic_proto_enabled) { 1187 pr_err("IP-Config: Incomplete network configuration information\n"); 1188 return -1; 1189 } 1190 1191 #ifdef IPCONFIG_BOOTP 1192 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1193 pr_err("DHCP/BOOTP: No suitable device found\n"); 1194 #endif 1195 #ifdef IPCONFIG_RARP 1196 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1197 pr_err("RARP: No suitable device found\n"); 1198 #endif 1199 1200 if (!ic_proto_have_if) 1201 /* Error message already printed */ 1202 return -1; 1203 1204 /* 1205 * Setup protocols 1206 */ 1207 #ifdef IPCONFIG_BOOTP 1208 if (do_bootp) 1209 ic_bootp_init(); 1210 #endif 1211 #ifdef IPCONFIG_RARP 1212 if (do_rarp) 1213 ic_rarp_init(); 1214 #endif 1215 1216 /* 1217 * Send requests and wait, until we get an answer. This loop 1218 * seems to be a terrible waste of CPU time, but actually there is 1219 * only one process running at all, so we don't need to use any 1220 * scheduler functions. 1221 * [Actually we could now, but the nothing else running note still 1222 * applies.. - AC] 1223 */ 1224 pr_notice("Sending %s%s%s requests .", 1225 do_bootp 1226 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1227 (do_bootp && do_rarp) ? " and " : "", 1228 do_rarp ? "RARP" : ""); 1229 1230 start_jiffies = jiffies; 1231 d = ic_first_dev; 1232 retries = CONF_SEND_RETRIES; 1233 get_random_bytes(&timeout, sizeof(timeout)); 1234 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM); 1235 for (;;) { 1236 #ifdef IPCONFIG_BOOTP 1237 /* Track the device we are configuring */ 1238 ic_dev_xid = d->xid; 1239 1240 if (do_bootp && (d->able & IC_BOOTP)) 1241 ic_bootp_send_if(d, jiffies - start_jiffies); 1242 #endif 1243 #ifdef IPCONFIG_RARP 1244 if (do_rarp && (d->able & IC_RARP)) 1245 ic_rarp_send_if(d); 1246 #endif 1247 1248 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1249 while (time_before(jiffies, jiff) && !ic_got_reply) 1250 schedule_timeout_uninterruptible(1); 1251 #ifdef IPCONFIG_DHCP 1252 /* DHCP isn't done until we get a DHCPACK. */ 1253 if ((ic_got_reply & IC_BOOTP) && 1254 (ic_proto_enabled & IC_USE_DHCP) && 1255 ic_dhcp_msgtype != DHCPACK) { 1256 ic_got_reply = 0; 1257 pr_cont(","); 1258 continue; 1259 } 1260 #endif /* IPCONFIG_DHCP */ 1261 1262 if (ic_got_reply) { 1263 pr_cont(" OK\n"); 1264 break; 1265 } 1266 1267 if ((d = d->next)) 1268 continue; 1269 1270 if (! --retries) { 1271 pr_cont(" timed out!\n"); 1272 break; 1273 } 1274 1275 d = ic_first_dev; 1276 1277 timeout = timeout CONF_TIMEOUT_MULT; 1278 if (timeout > CONF_TIMEOUT_MAX) 1279 timeout = CONF_TIMEOUT_MAX; 1280 1281 pr_cont("."); 1282 } 1283 1284 #ifdef IPCONFIG_BOOTP 1285 if (do_bootp) 1286 ic_bootp_cleanup(); 1287 #endif 1288 #ifdef IPCONFIG_RARP 1289 if (do_rarp) 1290 ic_rarp_cleanup(); 1291 #endif 1292 1293 if (!ic_got_reply) { 1294 ic_myaddr = NONE; 1295 return -1; 1296 } 1297 1298 printk("IP-Config: Got %s answer from %pI4, ", 1299 ((ic_got_reply & IC_RARP) ? "RARP" 1300 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1301 &ic_addrservaddr); 1302 pr_cont("my address is %pI4\n", &ic_myaddr); 1303 1304 return 0; 1305 } 1306 1307 #endif /* IPCONFIG_DYNAMIC */ 1308 1309 #ifdef CONFIG_PROC_FS 1310 1311 static int pnp_seq_show(struct seq_file *seq, void *v) 1312 { 1313 int i; 1314 1315 if (ic_proto_used & IC_PROTO) 1316 seq_printf(seq, "#PROTO: %s\n", 1317 (ic_proto_used & IC_RARP) ? "RARP" 1318 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1319 else 1320 seq_puts(seq, "#MANUAL\n"); 1321 1322 if (ic_domain[0]) 1323 seq_printf(seq, 1324 "domain %s\n", ic_domain); 1325 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1326 if (ic_nameservers[i] != NONE) 1327 seq_printf(seq, "nameserver %pI4\n", 1328 &ic_nameservers[i]); 1329 } 1330 if (ic_servaddr != NONE) 1331 seq_printf(seq, "bootserver %pI4\n", 1332 &ic_servaddr); 1333 return 0; 1334 } 1335 1336 static int pnp_seq_open(struct inode *indoe, struct file *file) 1337 { 1338 return single_open(file, pnp_seq_show, NULL); 1339 } 1340 1341 static const struct file_operations pnp_seq_fops = { 1342 .owner = THIS_MODULE, 1343 .open = pnp_seq_open, 1344 .read = seq_read, 1345 .llseek = seq_lseek, 1346 .release = single_release, 1347 }; 1348 #endif /* CONFIG_PROC_FS */ 1349 1350 /* 1351 * Extract IP address from the parameter string if needed. Note that we 1352 * need to have root_server_addr set _before_ IPConfig gets called as it 1353 * can override it. 1354 */ 1355 __be32 __init root_nfs_parse_addr(char *name) 1356 { 1357 __be32 addr; 1358 int octets = 0; 1359 char *cp, *cq; 1360 1361 cp = cq = name; 1362 while (octets < 4) { 1363 while (*cp >= '0' && *cp <= '9') 1364 cp++; 1365 if (cp == cq || cp - cq > 3) 1366 break; 1367 if (*cp == '.' || octets == 3) 1368 octets++; 1369 if (octets < 4) 1370 cp++; 1371 cq = cp; 1372 } 1373 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1374 if (*cp == ':') 1375 *cp++ = '\0'; 1376 addr = in_aton(name); 1377 memmove(name, cp, strlen(cp) + 1); 1378 } else 1379 addr = NONE; 1380 1381 return addr; 1382 } 1383 1384 #define DEVICE_WAIT_MAX 12 /* 12 seconds */ 1385 1386 static int __init wait_for_devices(void) 1387 { 1388 int i; 1389 1390 for (i = 0; i < DEVICE_WAIT_MAX; i++) { 1391 struct net_device *dev; 1392 int found = 0; 1393 1394 rtnl_lock(); 1395 for_each_netdev(&init_net, dev) { 1396 if (ic_is_init_dev(dev)) { 1397 found = 1; 1398 break; 1399 } 1400 } 1401 rtnl_unlock(); 1402 if (found) 1403 return 0; 1404 ssleep(1); 1405 } 1406 return -ENODEV; 1407 } 1408 1409 /* 1410 * IP Autoconfig dispatcher. 1411 */ 1412 1413 static int __init ip_auto_config(void) 1414 { 1415 __be32 addr; 1416 #ifdef IPCONFIG_DYNAMIC 1417 int retries = CONF_OPEN_RETRIES; 1418 #endif 1419 int err; 1420 unsigned int i; 1421 1422 #ifdef CONFIG_PROC_FS 1423 proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops); 1424 #endif /* CONFIG_PROC_FS */ 1425 1426 if (!ic_enable) 1427 return 0; 1428 1429 DBG(("IP-Config: Entered.\n")); 1430 #ifdef IPCONFIG_DYNAMIC 1431 try_try_again: 1432 #endif 1433 /* Wait for devices to appear */ 1434 err = wait_for_devices(); 1435 if (err) 1436 return err; 1437 1438 /* Setup all network devices */ 1439 err = ic_open_devs(); 1440 if (err) 1441 return err; 1442 1443 /* Give drivers a chance to settle */ 1444 msleep(CONF_POST_OPEN); 1445 1446 /* 1447 * If the config information is insufficient (e.g., our IP address or 1448 * IP address of the boot server is missing or we have multiple network 1449 * interfaces and no default was set), use BOOTP or RARP to get the 1450 * missing values. 1451 */ 1452 if (ic_myaddr == NONE || 1453 #ifdef CONFIG_ROOT_NFS 1454 (root_server_addr == NONE && 1455 ic_servaddr == NONE && 1456 ROOT_DEV == Root_NFS) || 1457 #endif 1458 ic_first_dev->next) { 1459 #ifdef IPCONFIG_DYNAMIC 1460 if (ic_dynamic() < 0) { 1461 ic_close_devs(); 1462 1463 /* 1464 * I don't know why, but sometimes the 1465 * eepro100 driver (at least) gets upset and 1466 * doesn't work the first time it's opened. 1467 * But then if you close it and reopen it, it 1468 * works just fine. So we need to try that at 1469 * least once before giving up. 1470 * 1471 * Also, if the root will be NFS-mounted, we 1472 * have nowhere to go if DHCP fails. So we 1473 * just have to keep trying forever. 1474 * 1475 * -- Chip 1476 */ 1477 #ifdef CONFIG_ROOT_NFS 1478 if (ROOT_DEV == Root_NFS) { 1479 pr_err("IP-Config: Retrying forever (NFS root)...\n"); 1480 goto try_try_again; 1481 } 1482 #endif 1483 1484 if (--retries) { 1485 pr_err("IP-Config: Reopening network devices...\n"); 1486 goto try_try_again; 1487 } 1488 1489 /* Oh, well. At least we tried. */ 1490 pr_err("IP-Config: Auto-configuration of network failed\n"); 1491 return -1; 1492 } 1493 #else /* !DYNAMIC */ 1494 pr_err("IP-Config: Incomplete network configuration information\n"); 1495 ic_close_devs(); 1496 return -1; 1497 #endif /* IPCONFIG_DYNAMIC */ 1498 } else { 1499 /* Device selected manually or only one device -> use it */ 1500 ic_dev = ic_first_dev->dev; 1501 } 1502 1503 addr = root_nfs_parse_addr(root_server_path); 1504 if (root_server_addr == NONE) 1505 root_server_addr = addr; 1506 1507 /* 1508 * Use defaults wherever applicable. 1509 */ 1510 if (ic_defaults() < 0) 1511 return -1; 1512 1513 /* 1514 * Close all network devices except the device we've 1515 * autoconfigured and set up routes. 1516 */ 1517 ic_close_devs(); 1518 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1519 return -1; 1520 1521 /* 1522 * Record which protocol was actually used. 1523 */ 1524 #ifdef IPCONFIG_DYNAMIC 1525 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1526 #endif 1527 1528 #ifndef IPCONFIG_SILENT 1529 /* 1530 * Clue in the operator. 1531 */ 1532 pr_info("IP-Config: Complete:\n"); 1533 1534 pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n", 1535 ic_dev->name, ic_dev->addr_len, ic_dev->dev_addr, 1536 &ic_myaddr, &ic_netmask, &ic_gateway); 1537 pr_info(" host=%s, domain=%s, nis-domain=%s\n", 1538 utsname()->nodename, ic_domain, utsname()->domainname); 1539 pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s", 1540 &ic_servaddr, &root_server_addr, root_server_path); 1541 if (ic_dev_mtu) 1542 pr_cont(", mtu=%d", ic_dev_mtu); 1543 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 1544 if (ic_nameservers[i] != NONE) { 1545 pr_info(" nameserver%u=%pI4", 1546 i, &ic_nameservers[i]); 1547 break; 1548 } 1549 for (i++; i < CONF_NAMESERVERS_MAX; i++) 1550 if (ic_nameservers[i] != NONE) 1551 pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]); 1552 pr_cont("\n"); 1553 #endif /* !SILENT */ 1554 1555 return 0; 1556 } 1557 1558 late_initcall(ip_auto_config); 1559 1560 1561 /* 1562 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1563 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. 1564 */ 1565 static int __init ic_proto_name(char *name) 1566 { 1567 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1568 return 1; 1569 } 1570 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1571 return 0; 1572 } 1573 #ifdef CONFIG_IP_PNP_DHCP 1574 else if (!strncmp(name, "dhcp", 4)) { 1575 char *client_id; 1576 1577 ic_proto_enabled &= ~IC_RARP; 1578 client_id = strstr(name, "dhcp,"); 1579 if (client_id) { 1580 char *v; 1581 1582 client_id = client_id + 5; 1583 v = strchr(client_id, ','); 1584 if (!v) 1585 return 1; 1586 *v = 0; 1587 if (kstrtou8(client_id, 0, dhcp_client_identifier)) 1588 DBG("DHCP: Invalid client identifier type\n"); 1589 strncpy(dhcp_client_identifier + 1, v + 1, 251); 1590 *v = ','; 1591 } 1592 return 1; 1593 } 1594 #endif 1595 #ifdef CONFIG_IP_PNP_BOOTP 1596 else if (!strcmp(name, "bootp")) { 1597 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1598 return 1; 1599 } 1600 #endif 1601 #ifdef CONFIG_IP_PNP_RARP 1602 else if (!strcmp(name, "rarp")) { 1603 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1604 return 1; 1605 } 1606 #endif 1607 #ifdef IPCONFIG_DYNAMIC 1608 else if (!strcmp(name, "both")) { 1609 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1610 return 1; 1611 } 1612 #endif 1613 return 0; 1614 } 1615 1616 static int __init ip_auto_config_setup(char *addrs) 1617 { 1618 char *cp, *ip, *dp; 1619 int num = 0; 1620 1621 ic_set_manually = 1; 1622 ic_enable = 1; 1623 1624 /* 1625 * If any dhcp, bootp etc options are set, leave autoconfig on 1626 * and skip the below static IP processing. 1627 */ 1628 if (ic_proto_name(addrs)) 1629 return 1; 1630 1631 /* If no static IP is given, turn off autoconfig and bail. */ 1632 if (*addrs == 0 || 1633 strcmp(addrs, "off") == 0 || 1634 strcmp(addrs, "none") == 0) { 1635 ic_enable = 0; 1636 return 1; 1637 } 1638 1639 ic_nameservers_predef(); 1640 1641 /* Parse string for static IP assignment. */ 1642 ip = addrs; 1643 while (ip && *ip) { 1644 if ((cp = strchr(ip, ':'))) 1645 *cp++ = '\0'; 1646 if (strlen(ip) > 0) { 1647 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); 1648 switch (num) { 1649 case 0: 1650 if ((ic_myaddr = in_aton(ip)) == ANY) 1651 ic_myaddr = NONE; 1652 break; 1653 case 1: 1654 if ((ic_servaddr = in_aton(ip)) == ANY) 1655 ic_servaddr = NONE; 1656 break; 1657 case 2: 1658 if ((ic_gateway = in_aton(ip)) == ANY) 1659 ic_gateway = NONE; 1660 break; 1661 case 3: 1662 if ((ic_netmask = in_aton(ip)) == ANY) 1663 ic_netmask = NONE; 1664 break; 1665 case 4: 1666 if ((dp = strchr(ip, '.'))) { 1667 *dp++ = '\0'; 1668 strlcpy(utsname()->domainname, dp, 1669 sizeof(utsname()->domainname)); 1670 } 1671 strlcpy(utsname()->nodename, ip, 1672 sizeof(utsname()->nodename)); 1673 ic_host_name_set = 1; 1674 break; 1675 case 5: 1676 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1677 break; 1678 case 6: 1679 if (ic_proto_name(ip) == 0 && 1680 ic_myaddr == NONE) { 1681 ic_enable = 0; 1682 } 1683 break; 1684 case 7: 1685 if (CONF_NAMESERVERS_MAX >= 1) { 1686 ic_nameservers[0] = in_aton(ip); 1687 if (ic_nameservers[0] == ANY) 1688 ic_nameservers[0] = NONE; 1689 } 1690 break; 1691 case 8: 1692 if (CONF_NAMESERVERS_MAX >= 2) { 1693 ic_nameservers[1] = in_aton(ip); 1694 if (ic_nameservers[1] == ANY) 1695 ic_nameservers[1] = NONE; 1696 } 1697 break; 1698 } 1699 } 1700 ip = cp; 1701 num++; 1702 } 1703 1704 return 1; 1705 } 1706 __setup("ip=", ip_auto_config_setup); 1707 1708 static int __init nfsaddrs_config_setup(char *addrs) 1709 { 1710 return ip_auto_config_setup(addrs); 1711 } 1712 __setup("nfsaddrs=", nfsaddrs_config_setup); 1713 1714 static int __init vendor_class_identifier_setup(char *addrs) 1715 { 1716 if (strlcpy(vendor_class_identifier, addrs, 1717 sizeof(vendor_class_identifier)) 1718 >= sizeof(vendor_class_identifier)) 1719 pr_warn("DHCP: vendorclass too long, truncated to \"%s\"", 1720 vendor_class_identifier); 1721 return 1; 1722 } 1723 __setup("dhcpclass=", vendor_class_identifier_setup); 1724