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 <net/net_namespace.h> 57 #include <net/arp.h> 58 #include <net/ip.h> 59 #include <net/ipconfig.h> 60 #include <net/route.h> 61 62 #include <asm/uaccess.h> 63 #include <net/checksum.h> 64 #include <asm/processor.h> 65 66 /* Define this to allow debugging output */ 67 #undef IPCONFIG_DEBUG 68 69 #ifdef IPCONFIG_DEBUG 70 #define DBG(x) printk x 71 #else 72 #define DBG(x) do { } while(0) 73 #endif 74 75 #if defined(CONFIG_IP_PNP_DHCP) 76 #define IPCONFIG_DHCP 77 #endif 78 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) 79 #define IPCONFIG_BOOTP 80 #endif 81 #if defined(CONFIG_IP_PNP_RARP) 82 #define IPCONFIG_RARP 83 #endif 84 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) 85 #define IPCONFIG_DYNAMIC 86 #endif 87 88 /* Define the friendly delay before and after opening net devices */ 89 #define CONF_PRE_OPEN 500 /* Before opening: 1/2 second */ 90 #define CONF_POST_OPEN 1 /* After opening: 1 second */ 91 92 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ 93 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ 94 #define CONF_SEND_RETRIES 6 /* Send six requests per open */ 95 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */ 96 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ 97 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ 98 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ 99 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ 100 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers 101 - '3' from resolv.h */ 102 103 #define NONE cpu_to_be32(INADDR_NONE) 104 #define ANY cpu_to_be32(INADDR_ANY) 105 106 /* 107 * Public IP configuration 108 */ 109 110 /* This is used by platforms which might be able to set the ipconfig 111 * variables using firmware environment vars. If this is set, it will 112 * ignore such firmware variables. 113 */ 114 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ 115 116 static int ic_enable __initdata = 0; /* IP config enabled? */ 117 118 /* Protocol choice */ 119 int ic_proto_enabled __initdata = 0 120 #ifdef IPCONFIG_BOOTP 121 | IC_BOOTP 122 #endif 123 #ifdef CONFIG_IP_PNP_DHCP 124 | IC_USE_DHCP 125 #endif 126 #ifdef IPCONFIG_RARP 127 | IC_RARP 128 #endif 129 ; 130 131 static int ic_host_name_set __initdata = 0; /* Host name set by us? */ 132 133 __be32 ic_myaddr = NONE; /* My IP address */ 134 static __be32 ic_netmask = NONE; /* Netmask for local subnet */ 135 __be32 ic_gateway = NONE; /* Gateway IP address */ 136 137 __be32 ic_servaddr = NONE; /* Boot server IP address */ 138 139 __be32 root_server_addr = NONE; /* Address of NFS server */ 140 u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 141 142 /* vendor class identifier */ 143 static char vendor_class_identifier[253] __initdata; 144 145 /* Persistent data: */ 146 147 static int ic_proto_used; /* Protocol used, if any */ 148 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 149 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 150 151 /* 152 * Private state. 153 */ 154 155 /* Name of user-selected boot device */ 156 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 157 158 /* Protocols supported by available interfaces */ 159 static int ic_proto_have_if __initdata = 0; 160 161 #ifdef IPCONFIG_DYNAMIC 162 static DEFINE_SPINLOCK(ic_recv_lock); 163 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */ 164 #endif 165 #ifdef IPCONFIG_DHCP 166 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */ 167 #endif 168 169 170 /* 171 * Network devices 172 */ 173 174 struct ic_device { 175 struct ic_device *next; 176 struct net_device *dev; 177 unsigned short flags; 178 short able; 179 __be32 xid; 180 }; 181 182 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */ 183 static struct net_device *ic_dev __initdata = NULL; /* Selected device */ 184 185 static int __init ic_open_devs(void) 186 { 187 struct ic_device *d, **last; 188 struct net_device *dev; 189 unsigned short oflags; 190 191 last = &ic_first_dev; 192 rtnl_lock(); 193 194 /* bring loopback device up first */ 195 for_each_netdev(&init_net, dev) { 196 if (!(dev->flags & IFF_LOOPBACK)) 197 continue; 198 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) 199 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); 200 } 201 202 for_each_netdev(&init_net, dev) { 203 if (dev->flags & IFF_LOOPBACK) 204 continue; 205 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 206 (!(dev->flags & IFF_LOOPBACK) && 207 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 208 strncmp(dev->name, "dummy", 5))) { 209 int able = 0; 210 if (dev->mtu >= 364) 211 able |= IC_BOOTP; 212 else 213 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu); 214 if (!(dev->flags & IFF_NOARP)) 215 able |= IC_RARP; 216 able &= ic_proto_enabled; 217 if (ic_proto_enabled && !able) 218 continue; 219 oflags = dev->flags; 220 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 221 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); 222 continue; 223 } 224 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 225 rtnl_unlock(); 226 return -1; 227 } 228 d->dev = dev; 229 *last = d; 230 last = &d->next; 231 d->flags = oflags; 232 d->able = able; 233 if (able & IC_BOOTP) 234 get_random_bytes(&d->xid, sizeof(__be32)); 235 else 236 d->xid = 0; 237 ic_proto_have_if |= able; 238 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", 239 dev->name, able, d->xid)); 240 } 241 } 242 rtnl_unlock(); 243 244 *last = NULL; 245 246 if (!ic_first_dev) { 247 if (user_dev_name[0]) 248 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name); 249 else 250 printk(KERN_ERR "IP-Config: No network devices available.\n"); 251 return -1; 252 } 253 return 0; 254 } 255 256 static void __init ic_close_devs(void) 257 { 258 struct ic_device *d, *next; 259 struct net_device *dev; 260 261 rtnl_lock(); 262 next = ic_first_dev; 263 while ((d = next)) { 264 next = d->next; 265 dev = d->dev; 266 if (dev != ic_dev) { 267 DBG(("IP-Config: Downing %s\n", dev->name)); 268 dev_change_flags(dev, d->flags); 269 } 270 kfree(d); 271 } 272 rtnl_unlock(); 273 } 274 275 /* 276 * Interface to various network functions. 277 */ 278 279 static inline void 280 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 281 { 282 sin->sin_family = AF_INET; 283 sin->sin_addr.s_addr = addr; 284 sin->sin_port = port; 285 } 286 287 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 288 { 289 int res; 290 291 mm_segment_t oldfs = get_fs(); 292 set_fs(get_ds()); 293 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 294 set_fs(oldfs); 295 return res; 296 } 297 298 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 299 { 300 int res; 301 302 mm_segment_t oldfs = get_fs(); 303 set_fs(get_ds()); 304 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); 305 set_fs(oldfs); 306 return res; 307 } 308 309 /* 310 * Set up interface addresses and routes. 311 */ 312 313 static int __init ic_setup_if(void) 314 { 315 struct ifreq ir; 316 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 317 int err; 318 319 memset(&ir, 0, sizeof(ir)); 320 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); 321 set_sockaddr(sin, ic_myaddr, 0); 322 if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) { 323 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err); 324 return -1; 325 } 326 set_sockaddr(sin, ic_netmask, 0); 327 if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 328 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err); 329 return -1; 330 } 331 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 332 if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 333 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err); 334 return -1; 335 } 336 return 0; 337 } 338 339 static int __init ic_setup_routes(void) 340 { 341 /* No need to setup device routes, only the default route... */ 342 343 if (ic_gateway != NONE) { 344 struct rtentry rm; 345 int err; 346 347 memset(&rm, 0, sizeof(rm)); 348 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 349 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n"); 350 return -1; 351 } 352 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 353 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 354 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 355 rm.rt_flags = RTF_UP | RTF_GATEWAY; 356 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 357 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err); 358 return -1; 359 } 360 } 361 362 return 0; 363 } 364 365 /* 366 * Fill in default values for all missing parameters. 367 */ 368 369 static int __init ic_defaults(void) 370 { 371 /* 372 * At this point we have no userspace running so need not 373 * claim locks on system_utsname 374 */ 375 376 if (!ic_host_name_set) 377 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 378 379 if (root_server_addr == NONE) 380 root_server_addr = ic_servaddr; 381 382 if (ic_netmask == NONE) { 383 if (IN_CLASSA(ntohl(ic_myaddr))) 384 ic_netmask = htonl(IN_CLASSA_NET); 385 else if (IN_CLASSB(ntohl(ic_myaddr))) 386 ic_netmask = htonl(IN_CLASSB_NET); 387 else if (IN_CLASSC(ntohl(ic_myaddr))) 388 ic_netmask = htonl(IN_CLASSC_NET); 389 else { 390 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n", 391 &ic_myaddr); 392 return -1; 393 } 394 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask); 395 } 396 397 return 0; 398 } 399 400 /* 401 * RARP support. 402 */ 403 404 #ifdef IPCONFIG_RARP 405 406 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 407 408 static struct packet_type rarp_packet_type __initdata = { 409 .type = cpu_to_be16(ETH_P_RARP), 410 .func = ic_rarp_recv, 411 }; 412 413 static inline void __init ic_rarp_init(void) 414 { 415 dev_add_pack(&rarp_packet_type); 416 } 417 418 static inline void __init ic_rarp_cleanup(void) 419 { 420 dev_remove_pack(&rarp_packet_type); 421 } 422 423 /* 424 * Process received RARP packet. 425 */ 426 static int __init 427 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 428 { 429 struct arphdr *rarp; 430 unsigned char *rarp_ptr; 431 __be32 sip, tip; 432 unsigned char *sha, *tha; /* s for "source", t for "target" */ 433 struct ic_device *d; 434 435 if (!net_eq(dev_net(dev), &init_net)) 436 goto drop; 437 438 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 439 return NET_RX_DROP; 440 441 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 442 goto drop; 443 444 /* Basic sanity checks can be done without the lock. */ 445 rarp = (struct arphdr *)skb_transport_header(skb); 446 447 /* If this test doesn't pass, it's not IP, or we should 448 * ignore it anyway. 449 */ 450 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 451 goto drop; 452 453 /* If it's not a RARP reply, delete it. */ 454 if (rarp->ar_op != htons(ARPOP_RREPLY)) 455 goto drop; 456 457 /* If it's not Ethernet, delete it. */ 458 if (rarp->ar_pro != htons(ETH_P_IP)) 459 goto drop; 460 461 if (!pskb_may_pull(skb, arp_hdr_len(dev))) 462 goto drop; 463 464 /* OK, it is all there and looks valid, process... */ 465 rarp = (struct arphdr *)skb_transport_header(skb); 466 rarp_ptr = (unsigned char *) (rarp + 1); 467 468 /* One reply at a time, please. */ 469 spin_lock(&ic_recv_lock); 470 471 /* If we already have a reply, just drop the packet */ 472 if (ic_got_reply) 473 goto drop_unlock; 474 475 /* Find the ic_device that the packet arrived on */ 476 d = ic_first_dev; 477 while (d && d->dev != dev) 478 d = d->next; 479 if (!d) 480 goto drop_unlock; /* should never happen */ 481 482 /* Extract variable-width fields */ 483 sha = rarp_ptr; 484 rarp_ptr += dev->addr_len; 485 memcpy(&sip, rarp_ptr, 4); 486 rarp_ptr += 4; 487 tha = rarp_ptr; 488 rarp_ptr += dev->addr_len; 489 memcpy(&tip, rarp_ptr, 4); 490 491 /* Discard packets which are not meant for us. */ 492 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 493 goto drop_unlock; 494 495 /* Discard packets which are not from specified server. */ 496 if (ic_servaddr != NONE && ic_servaddr != sip) 497 goto drop_unlock; 498 499 /* We have a winner! */ 500 ic_dev = dev; 501 if (ic_myaddr == NONE) 502 ic_myaddr = tip; 503 ic_servaddr = sip; 504 ic_got_reply = IC_RARP; 505 506 drop_unlock: 507 /* Show's over. Nothing to see here. */ 508 spin_unlock(&ic_recv_lock); 509 510 drop: 511 /* Throw the packet out. */ 512 kfree_skb(skb); 513 return 0; 514 } 515 516 517 /* 518 * Send RARP request packet over a single interface. 519 */ 520 static void __init ic_rarp_send_if(struct ic_device *d) 521 { 522 struct net_device *dev = d->dev; 523 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 524 dev->dev_addr, dev->dev_addr); 525 } 526 #endif 527 528 /* 529 * DHCP/BOOTP support. 530 */ 531 532 #ifdef IPCONFIG_BOOTP 533 534 struct bootp_pkt { /* BOOTP packet format */ 535 struct iphdr iph; /* IP header */ 536 struct udphdr udph; /* UDP header */ 537 u8 op; /* 1=request, 2=reply */ 538 u8 htype; /* HW address type */ 539 u8 hlen; /* HW address length */ 540 u8 hops; /* Used only by gateways */ 541 __be32 xid; /* Transaction ID */ 542 __be16 secs; /* Seconds since we started */ 543 __be16 flags; /* Just what it says */ 544 __be32 client_ip; /* Client's IP address if known */ 545 __be32 your_ip; /* Assigned IP address */ 546 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 547 __be32 relay_ip; /* IP address of BOOTP relay */ 548 u8 hw_addr[16]; /* Client's HW address */ 549 u8 serv_name[64]; /* Server host name */ 550 u8 boot_file[128]; /* Name of boot file */ 551 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 552 }; 553 554 /* packet ops */ 555 #define BOOTP_REQUEST 1 556 #define BOOTP_REPLY 2 557 558 /* DHCP message types */ 559 #define DHCPDISCOVER 1 560 #define DHCPOFFER 2 561 #define DHCPREQUEST 3 562 #define DHCPDECLINE 4 563 #define DHCPACK 5 564 #define DHCPNAK 6 565 #define DHCPRELEASE 7 566 #define DHCPINFORM 8 567 568 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 569 570 static struct packet_type bootp_packet_type __initdata = { 571 .type = cpu_to_be16(ETH_P_IP), 572 .func = ic_bootp_recv, 573 }; 574 575 576 /* 577 * Initialize DHCP/BOOTP extension fields in the request. 578 */ 579 580 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 581 582 #ifdef IPCONFIG_DHCP 583 584 static void __init 585 ic_dhcp_init_options(u8 *options) 586 { 587 u8 mt = ((ic_servaddr == NONE) 588 ? DHCPDISCOVER : DHCPREQUEST); 589 u8 *e = options; 590 int len; 591 592 #ifdef IPCONFIG_DEBUG 593 printk("DHCP: Sending message type %d\n", mt); 594 #endif 595 596 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 597 e += 4; 598 599 *e++ = 53; /* DHCP message type */ 600 *e++ = 1; 601 *e++ = mt; 602 603 if (mt == DHCPREQUEST) { 604 *e++ = 54; /* Server ID (IP address) */ 605 *e++ = 4; 606 memcpy(e, &ic_servaddr, 4); 607 e += 4; 608 609 *e++ = 50; /* Requested IP address */ 610 *e++ = 4; 611 memcpy(e, &ic_myaddr, 4); 612 e += 4; 613 } 614 615 /* always? */ 616 { 617 static const u8 ic_req_params[] = { 618 1, /* Subnet mask */ 619 3, /* Default gateway */ 620 6, /* DNS server */ 621 12, /* Host name */ 622 15, /* Domain name */ 623 17, /* Boot path */ 624 40, /* NIS domain name */ 625 }; 626 627 *e++ = 55; /* Parameter request list */ 628 *e++ = sizeof(ic_req_params); 629 memcpy(e, ic_req_params, sizeof(ic_req_params)); 630 e += sizeof(ic_req_params); 631 632 if (*vendor_class_identifier) { 633 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n", 634 vendor_class_identifier); 635 *e++ = 60; /* Class-identifier */ 636 len = strlen(vendor_class_identifier); 637 *e++ = len; 638 memcpy(e, vendor_class_identifier, len); 639 e += len; 640 } 641 } 642 643 *e++ = 255; /* End of the list */ 644 } 645 646 #endif /* IPCONFIG_DHCP */ 647 648 static void __init ic_bootp_init_ext(u8 *e) 649 { 650 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 651 e += 4; 652 *e++ = 1; /* Subnet mask request */ 653 *e++ = 4; 654 e += 4; 655 *e++ = 3; /* Default gateway request */ 656 *e++ = 4; 657 e += 4; 658 *e++ = 5; /* Name server request */ 659 *e++ = 8; 660 e += 8; 661 *e++ = 12; /* Host name request */ 662 *e++ = 32; 663 e += 32; 664 *e++ = 40; /* NIS Domain name request */ 665 *e++ = 32; 666 e += 32; 667 *e++ = 17; /* Boot path */ 668 *e++ = 40; 669 e += 40; 670 671 *e++ = 57; /* set extension buffer size for reply */ 672 *e++ = 2; 673 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 674 *e++ = 150; 675 676 *e++ = 255; /* End of the list */ 677 } 678 679 680 /* 681 * Initialize the DHCP/BOOTP mechanism. 682 */ 683 static inline void __init ic_bootp_init(void) 684 { 685 int i; 686 687 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 688 ic_nameservers[i] = NONE; 689 690 dev_add_pack(&bootp_packet_type); 691 } 692 693 694 /* 695 * DHCP/BOOTP cleanup. 696 */ 697 static inline void __init ic_bootp_cleanup(void) 698 { 699 dev_remove_pack(&bootp_packet_type); 700 } 701 702 703 /* 704 * Send DHCP/BOOTP request to single interface. 705 */ 706 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 707 { 708 struct net_device *dev = d->dev; 709 struct sk_buff *skb; 710 struct bootp_pkt *b; 711 struct iphdr *h; 712 713 /* Allocate packet */ 714 skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15, 715 GFP_KERNEL); 716 if (!skb) 717 return; 718 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 719 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 720 memset(b, 0, sizeof(struct bootp_pkt)); 721 722 /* Construct IP header */ 723 skb_reset_network_header(skb); 724 h = ip_hdr(skb); 725 h->version = 4; 726 h->ihl = 5; 727 h->tot_len = htons(sizeof(struct bootp_pkt)); 728 h->frag_off = htons(IP_DF); 729 h->ttl = 64; 730 h->protocol = IPPROTO_UDP; 731 h->daddr = htonl(INADDR_BROADCAST); 732 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 733 734 /* Construct UDP header */ 735 b->udph.source = htons(68); 736 b->udph.dest = htons(67); 737 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 738 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 739 740 /* Construct DHCP/BOOTP header */ 741 b->op = BOOTP_REQUEST; 742 if (dev->type < 256) /* check for false types */ 743 b->htype = dev->type; 744 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ 745 b->htype = ARPHRD_IEEE802; 746 else if (dev->type == ARPHRD_FDDI) 747 b->htype = ARPHRD_ETHER; 748 else { 749 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 750 b->htype = dev->type; /* can cause undefined behavior */ 751 } 752 753 /* server_ip and your_ip address are both already zero per RFC2131 */ 754 b->hlen = dev->addr_len; 755 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 756 b->secs = htons(jiffies_diff / HZ); 757 b->xid = d->xid; 758 759 /* add DHCP options or BOOTP extensions */ 760 #ifdef IPCONFIG_DHCP 761 if (ic_proto_enabled & IC_USE_DHCP) 762 ic_dhcp_init_options(b->exten); 763 else 764 #endif 765 ic_bootp_init_ext(b->exten); 766 767 /* Chain packet down the line... */ 768 skb->dev = dev; 769 skb->protocol = htons(ETH_P_IP); 770 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 771 dev->broadcast, dev->dev_addr, skb->len) < 0 || 772 dev_queue_xmit(skb) < 0) 773 printk("E"); 774 } 775 776 777 /* 778 * Copy BOOTP-supplied string if not already set. 779 */ 780 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 781 { 782 if (!len) 783 return 0; 784 if (len > max-1) 785 len = max-1; 786 memcpy(dest, src, len); 787 dest[len] = '\0'; 788 return 1; 789 } 790 791 792 /* 793 * Process BOOTP extensions. 794 */ 795 static void __init ic_do_bootp_ext(u8 *ext) 796 { 797 u8 servers; 798 int i; 799 800 #ifdef IPCONFIG_DEBUG 801 u8 *c; 802 803 printk("DHCP/BOOTP: Got extension %d:",*ext); 804 for (c=ext+2; c<ext+2+ext[1]; c++) 805 printk(" %02x", *c); 806 printk("\n"); 807 #endif 808 809 switch (*ext++) { 810 case 1: /* Subnet mask */ 811 if (ic_netmask == NONE) 812 memcpy(&ic_netmask, ext+1, 4); 813 break; 814 case 3: /* Default gateway */ 815 if (ic_gateway == NONE) 816 memcpy(&ic_gateway, ext+1, 4); 817 break; 818 case 6: /* DNS server */ 819 servers= *ext/4; 820 if (servers > CONF_NAMESERVERS_MAX) 821 servers = CONF_NAMESERVERS_MAX; 822 for (i = 0; i < servers; i++) { 823 if (ic_nameservers[i] == NONE) 824 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 825 } 826 break; 827 case 12: /* Host name */ 828 ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN); 829 ic_host_name_set = 1; 830 break; 831 case 15: /* Domain name (DNS) */ 832 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 833 break; 834 case 17: /* Root path */ 835 if (!root_server_path[0]) 836 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path)); 837 break; 838 case 40: /* NIS Domain name (_not_ DNS) */ 839 ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN); 840 break; 841 } 842 } 843 844 845 /* 846 * Receive BOOTP reply. 847 */ 848 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 849 { 850 struct bootp_pkt *b; 851 struct iphdr *h; 852 struct ic_device *d; 853 int len, ext_len; 854 855 if (!net_eq(dev_net(dev), &init_net)) 856 goto drop; 857 858 /* Perform verifications before taking the lock. */ 859 if (skb->pkt_type == PACKET_OTHERHOST) 860 goto drop; 861 862 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 863 return NET_RX_DROP; 864 865 if (!pskb_may_pull(skb, 866 sizeof(struct iphdr) + 867 sizeof(struct udphdr))) 868 goto drop; 869 870 b = (struct bootp_pkt *)skb_network_header(skb); 871 h = &b->iph; 872 873 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 874 goto drop; 875 876 /* Fragments are not supported */ 877 if (h->frag_off & htons(IP_OFFSET | IP_MF)) { 878 if (net_ratelimit()) 879 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " 880 "reply.\n"); 881 goto drop; 882 } 883 884 if (skb->len < ntohs(h->tot_len)) 885 goto drop; 886 887 if (ip_fast_csum((char *) h, h->ihl)) 888 goto drop; 889 890 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 891 goto drop; 892 893 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 894 goto drop; 895 896 len = ntohs(b->udph.len) - sizeof(struct udphdr); 897 ext_len = len - (sizeof(*b) - 898 sizeof(struct iphdr) - 899 sizeof(struct udphdr) - 900 sizeof(b->exten)); 901 if (ext_len < 0) 902 goto drop; 903 904 /* Ok the front looks good, make sure we can get at the rest. */ 905 if (!pskb_may_pull(skb, skb->len)) 906 goto drop; 907 908 b = (struct bootp_pkt *)skb_network_header(skb); 909 h = &b->iph; 910 911 /* One reply at a time, please. */ 912 spin_lock(&ic_recv_lock); 913 914 /* If we already have a reply, just drop the packet */ 915 if (ic_got_reply) 916 goto drop_unlock; 917 918 /* Find the ic_device that the packet arrived on */ 919 d = ic_first_dev; 920 while (d && d->dev != dev) 921 d = d->next; 922 if (!d) 923 goto drop_unlock; /* should never happen */ 924 925 /* Is it a reply to our BOOTP request? */ 926 if (b->op != BOOTP_REPLY || 927 b->xid != d->xid) { 928 if (net_ratelimit()) 929 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " 930 "op[%x] xid[%x]\n", 931 b->op, b->xid); 932 goto drop_unlock; 933 } 934 935 /* Parse extensions */ 936 if (ext_len >= 4 && 937 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 938 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 939 u8 *ext; 940 941 #ifdef IPCONFIG_DHCP 942 if (ic_proto_enabled & IC_USE_DHCP) { 943 __be32 server_id = NONE; 944 int mt = 0; 945 946 ext = &b->exten[4]; 947 while (ext < end && *ext != 0xff) { 948 u8 *opt = ext++; 949 if (*opt == 0) /* Padding */ 950 continue; 951 ext += *ext + 1; 952 if (ext >= end) 953 break; 954 switch (*opt) { 955 case 53: /* Message type */ 956 if (opt[1]) 957 mt = opt[2]; 958 break; 959 case 54: /* Server ID (IP address) */ 960 if (opt[1] >= 4) 961 memcpy(&server_id, opt + 2, 4); 962 break; 963 } 964 } 965 966 #ifdef IPCONFIG_DEBUG 967 printk("DHCP: Got message type %d\n", mt); 968 #endif 969 970 switch (mt) { 971 case DHCPOFFER: 972 /* While in the process of accepting one offer, 973 * ignore all others. 974 */ 975 if (ic_myaddr != NONE) 976 goto drop_unlock; 977 978 /* Let's accept that offer. */ 979 ic_myaddr = b->your_ip; 980 ic_servaddr = server_id; 981 #ifdef IPCONFIG_DEBUG 982 printk("DHCP: Offered address %pI4 by server %pI4\n", 983 &ic_myaddr, &ic_servaddr); 984 #endif 985 /* The DHCP indicated server address takes 986 * precedence over the bootp header one if 987 * they are different. 988 */ 989 if ((server_id != NONE) && 990 (b->server_ip != server_id)) 991 b->server_ip = ic_servaddr; 992 break; 993 994 case DHCPACK: 995 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 996 goto drop_unlock; 997 998 /* Yeah! */ 999 break; 1000 1001 default: 1002 /* Urque. Forget it*/ 1003 ic_myaddr = NONE; 1004 ic_servaddr = NONE; 1005 goto drop_unlock; 1006 } 1007 1008 ic_dhcp_msgtype = mt; 1009 1010 } 1011 #endif /* IPCONFIG_DHCP */ 1012 1013 ext = &b->exten[4]; 1014 while (ext < end && *ext != 0xff) { 1015 u8 *opt = ext++; 1016 if (*opt == 0) /* Padding */ 1017 continue; 1018 ext += *ext + 1; 1019 if (ext < end) 1020 ic_do_bootp_ext(opt); 1021 } 1022 } 1023 1024 /* We have a winner! */ 1025 ic_dev = dev; 1026 ic_myaddr = b->your_ip; 1027 ic_servaddr = b->server_ip; 1028 if (ic_gateway == NONE && b->relay_ip) 1029 ic_gateway = b->relay_ip; 1030 if (ic_nameservers[0] == NONE) 1031 ic_nameservers[0] = ic_servaddr; 1032 ic_got_reply = IC_BOOTP; 1033 1034 drop_unlock: 1035 /* Show's over. Nothing to see here. */ 1036 spin_unlock(&ic_recv_lock); 1037 1038 drop: 1039 /* Throw the packet out. */ 1040 kfree_skb(skb); 1041 1042 return 0; 1043 } 1044 1045 1046 #endif 1047 1048 1049 /* 1050 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1051 */ 1052 1053 #ifdef IPCONFIG_DYNAMIC 1054 1055 static int __init ic_dynamic(void) 1056 { 1057 int retries; 1058 struct ic_device *d; 1059 unsigned long start_jiffies, timeout, jiff; 1060 int do_bootp = ic_proto_have_if & IC_BOOTP; 1061 int do_rarp = ic_proto_have_if & IC_RARP; 1062 1063 /* 1064 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1065 * This routine gets only called when some pieces of information 1066 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1067 */ 1068 if (!ic_proto_enabled) { 1069 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1070 return -1; 1071 } 1072 1073 #ifdef IPCONFIG_BOOTP 1074 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1075 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); 1076 #endif 1077 #ifdef IPCONFIG_RARP 1078 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1079 printk(KERN_ERR "RARP: No suitable device found.\n"); 1080 #endif 1081 1082 if (!ic_proto_have_if) 1083 /* Error message already printed */ 1084 return -1; 1085 1086 /* 1087 * Setup protocols 1088 */ 1089 #ifdef IPCONFIG_BOOTP 1090 if (do_bootp) 1091 ic_bootp_init(); 1092 #endif 1093 #ifdef IPCONFIG_RARP 1094 if (do_rarp) 1095 ic_rarp_init(); 1096 #endif 1097 1098 /* 1099 * Send requests and wait, until we get an answer. This loop 1100 * seems to be a terrible waste of CPU time, but actually there is 1101 * only one process running at all, so we don't need to use any 1102 * scheduler functions. 1103 * [Actually we could now, but the nothing else running note still 1104 * applies.. - AC] 1105 */ 1106 printk(KERN_NOTICE "Sending %s%s%s requests .", 1107 do_bootp 1108 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1109 (do_bootp && do_rarp) ? " and " : "", 1110 do_rarp ? "RARP" : ""); 1111 1112 start_jiffies = jiffies; 1113 d = ic_first_dev; 1114 retries = CONF_SEND_RETRIES; 1115 get_random_bytes(&timeout, sizeof(timeout)); 1116 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); 1117 for (;;) { 1118 #ifdef IPCONFIG_BOOTP 1119 if (do_bootp && (d->able & IC_BOOTP)) 1120 ic_bootp_send_if(d, jiffies - start_jiffies); 1121 #endif 1122 #ifdef IPCONFIG_RARP 1123 if (do_rarp && (d->able & IC_RARP)) 1124 ic_rarp_send_if(d); 1125 #endif 1126 1127 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1128 while (time_before(jiffies, jiff) && !ic_got_reply) 1129 schedule_timeout_uninterruptible(1); 1130 #ifdef IPCONFIG_DHCP 1131 /* DHCP isn't done until we get a DHCPACK. */ 1132 if ((ic_got_reply & IC_BOOTP) 1133 && (ic_proto_enabled & IC_USE_DHCP) 1134 && ic_dhcp_msgtype != DHCPACK) 1135 { 1136 ic_got_reply = 0; 1137 printk(","); 1138 continue; 1139 } 1140 #endif /* IPCONFIG_DHCP */ 1141 1142 if (ic_got_reply) { 1143 printk(" OK\n"); 1144 break; 1145 } 1146 1147 if ((d = d->next)) 1148 continue; 1149 1150 if (! --retries) { 1151 printk(" timed out!\n"); 1152 break; 1153 } 1154 1155 d = ic_first_dev; 1156 1157 timeout = timeout CONF_TIMEOUT_MULT; 1158 if (timeout > CONF_TIMEOUT_MAX) 1159 timeout = CONF_TIMEOUT_MAX; 1160 1161 printk("."); 1162 } 1163 1164 #ifdef IPCONFIG_BOOTP 1165 if (do_bootp) 1166 ic_bootp_cleanup(); 1167 #endif 1168 #ifdef IPCONFIG_RARP 1169 if (do_rarp) 1170 ic_rarp_cleanup(); 1171 #endif 1172 1173 if (!ic_got_reply) { 1174 ic_myaddr = NONE; 1175 return -1; 1176 } 1177 1178 printk("IP-Config: Got %s answer from %pI4, ", 1179 ((ic_got_reply & IC_RARP) ? "RARP" 1180 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1181 &ic_servaddr); 1182 printk("my address is %pI4\n", &ic_myaddr); 1183 1184 return 0; 1185 } 1186 1187 #endif /* IPCONFIG_DYNAMIC */ 1188 1189 #ifdef CONFIG_PROC_FS 1190 1191 static int pnp_seq_show(struct seq_file *seq, void *v) 1192 { 1193 int i; 1194 1195 if (ic_proto_used & IC_PROTO) 1196 seq_printf(seq, "#PROTO: %s\n", 1197 (ic_proto_used & IC_RARP) ? "RARP" 1198 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1199 else 1200 seq_puts(seq, "#MANUAL\n"); 1201 1202 if (ic_domain[0]) 1203 seq_printf(seq, 1204 "domain %s\n", ic_domain); 1205 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1206 if (ic_nameservers[i] != NONE) 1207 seq_printf(seq, "nameserver %pI4\n", 1208 &ic_nameservers[i]); 1209 } 1210 if (ic_servaddr != NONE) 1211 seq_printf(seq, "bootserver %pI4\n", 1212 &ic_servaddr); 1213 return 0; 1214 } 1215 1216 static int pnp_seq_open(struct inode *indoe, struct file *file) 1217 { 1218 return single_open(file, pnp_seq_show, NULL); 1219 } 1220 1221 static const struct file_operations pnp_seq_fops = { 1222 .owner = THIS_MODULE, 1223 .open = pnp_seq_open, 1224 .read = seq_read, 1225 .llseek = seq_lseek, 1226 .release = single_release, 1227 }; 1228 #endif /* CONFIG_PROC_FS */ 1229 1230 /* 1231 * Extract IP address from the parameter string if needed. Note that we 1232 * need to have root_server_addr set _before_ IPConfig gets called as it 1233 * can override it. 1234 */ 1235 __be32 __init root_nfs_parse_addr(char *name) 1236 { 1237 __be32 addr; 1238 int octets = 0; 1239 char *cp, *cq; 1240 1241 cp = cq = name; 1242 while (octets < 4) { 1243 while (*cp >= '0' && *cp <= '9') 1244 cp++; 1245 if (cp == cq || cp - cq > 3) 1246 break; 1247 if (*cp == '.' || octets == 3) 1248 octets++; 1249 if (octets < 4) 1250 cp++; 1251 cq = cp; 1252 } 1253 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1254 if (*cp == ':') 1255 *cp++ = '\0'; 1256 addr = in_aton(name); 1257 memmove(name, cp, strlen(cp) + 1); 1258 } else 1259 addr = NONE; 1260 1261 return addr; 1262 } 1263 1264 /* 1265 * IP Autoconfig dispatcher. 1266 */ 1267 1268 static int __init ip_auto_config(void) 1269 { 1270 __be32 addr; 1271 #ifdef IPCONFIG_DYNAMIC 1272 int retries = CONF_OPEN_RETRIES; 1273 #endif 1274 1275 #ifdef CONFIG_PROC_FS 1276 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops); 1277 #endif /* CONFIG_PROC_FS */ 1278 1279 if (!ic_enable) 1280 return 0; 1281 1282 DBG(("IP-Config: Entered.\n")); 1283 #ifdef IPCONFIG_DYNAMIC 1284 try_try_again: 1285 #endif 1286 /* Give hardware a chance to settle */ 1287 msleep(CONF_PRE_OPEN); 1288 1289 /* Setup all network devices */ 1290 if (ic_open_devs() < 0) 1291 return -1; 1292 1293 /* Give drivers a chance to settle */ 1294 ssleep(CONF_POST_OPEN); 1295 1296 /* 1297 * If the config information is insufficient (e.g., our IP address or 1298 * IP address of the boot server is missing or we have multiple network 1299 * interfaces and no default was set), use BOOTP or RARP to get the 1300 * missing values. 1301 */ 1302 if (ic_myaddr == NONE || 1303 #ifdef CONFIG_ROOT_NFS 1304 (root_server_addr == NONE 1305 && ic_servaddr == NONE 1306 && ROOT_DEV == Root_NFS) || 1307 #endif 1308 ic_first_dev->next) { 1309 #ifdef IPCONFIG_DYNAMIC 1310 if (ic_dynamic() < 0) { 1311 ic_close_devs(); 1312 1313 /* 1314 * I don't know why, but sometimes the 1315 * eepro100 driver (at least) gets upset and 1316 * doesn't work the first time it's opened. 1317 * But then if you close it and reopen it, it 1318 * works just fine. So we need to try that at 1319 * least once before giving up. 1320 * 1321 * Also, if the root will be NFS-mounted, we 1322 * have nowhere to go if DHCP fails. So we 1323 * just have to keep trying forever. 1324 * 1325 * -- Chip 1326 */ 1327 #ifdef CONFIG_ROOT_NFS 1328 if (ROOT_DEV == Root_NFS) { 1329 printk(KERN_ERR 1330 "IP-Config: Retrying forever (NFS root)...\n"); 1331 goto try_try_again; 1332 } 1333 #endif 1334 1335 if (--retries) { 1336 printk(KERN_ERR 1337 "IP-Config: Reopening network devices...\n"); 1338 goto try_try_again; 1339 } 1340 1341 /* Oh, well. At least we tried. */ 1342 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); 1343 return -1; 1344 } 1345 #else /* !DYNAMIC */ 1346 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1347 ic_close_devs(); 1348 return -1; 1349 #endif /* IPCONFIG_DYNAMIC */ 1350 } else { 1351 /* Device selected manually or only one device -> use it */ 1352 ic_dev = ic_first_dev->dev; 1353 } 1354 1355 addr = root_nfs_parse_addr(root_server_path); 1356 if (root_server_addr == NONE) 1357 root_server_addr = addr; 1358 1359 /* 1360 * Use defaults whereever applicable. 1361 */ 1362 if (ic_defaults() < 0) 1363 return -1; 1364 1365 /* 1366 * Close all network devices except the device we've 1367 * autoconfigured and set up routes. 1368 */ 1369 ic_close_devs(); 1370 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1371 return -1; 1372 1373 /* 1374 * Record which protocol was actually used. 1375 */ 1376 #ifdef IPCONFIG_DYNAMIC 1377 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1378 #endif 1379 1380 #ifndef IPCONFIG_SILENT 1381 /* 1382 * Clue in the operator. 1383 */ 1384 printk("IP-Config: Complete:"); 1385 printk("\n device=%s", ic_dev->name); 1386 printk(", addr=%pI4", &ic_myaddr); 1387 printk(", mask=%pI4", &ic_netmask); 1388 printk(", gw=%pI4", &ic_gateway); 1389 printk(",\n host=%s, domain=%s, nis-domain=%s", 1390 utsname()->nodename, ic_domain, utsname()->domainname); 1391 printk(",\n bootserver=%pI4", &ic_servaddr); 1392 printk(", rootserver=%pI4", &root_server_addr); 1393 printk(", rootpath=%s", root_server_path); 1394 printk("\n"); 1395 #endif /* !SILENT */ 1396 1397 return 0; 1398 } 1399 1400 late_initcall(ip_auto_config); 1401 1402 1403 /* 1404 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1405 * command line parameter. See Documentation/filesystems/nfsroot.txt. 1406 */ 1407 static int __init ic_proto_name(char *name) 1408 { 1409 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1410 return 1; 1411 } 1412 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1413 return 0; 1414 } 1415 #ifdef CONFIG_IP_PNP_DHCP 1416 else if (!strcmp(name, "dhcp")) { 1417 ic_proto_enabled &= ~IC_RARP; 1418 return 1; 1419 } 1420 #endif 1421 #ifdef CONFIG_IP_PNP_BOOTP 1422 else if (!strcmp(name, "bootp")) { 1423 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1424 return 1; 1425 } 1426 #endif 1427 #ifdef CONFIG_IP_PNP_RARP 1428 else if (!strcmp(name, "rarp")) { 1429 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1430 return 1; 1431 } 1432 #endif 1433 #ifdef IPCONFIG_DYNAMIC 1434 else if (!strcmp(name, "both")) { 1435 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1436 return 1; 1437 } 1438 #endif 1439 return 0; 1440 } 1441 1442 static int __init ip_auto_config_setup(char *addrs) 1443 { 1444 char *cp, *ip, *dp; 1445 int num = 0; 1446 1447 ic_set_manually = 1; 1448 ic_enable = 1; 1449 1450 /* 1451 * If any dhcp, bootp etc options are set, leave autoconfig on 1452 * and skip the below static IP processing. 1453 */ 1454 if (ic_proto_name(addrs)) 1455 return 1; 1456 1457 /* If no static IP is given, turn off autoconfig and bail. */ 1458 if (*addrs == 0 || 1459 strcmp(addrs, "off") == 0 || 1460 strcmp(addrs, "none") == 0) { 1461 ic_enable = 0; 1462 return 1; 1463 } 1464 1465 /* Parse string for static IP assignment. */ 1466 ip = addrs; 1467 while (ip && *ip) { 1468 if ((cp = strchr(ip, ':'))) 1469 *cp++ = '\0'; 1470 if (strlen(ip) > 0) { 1471 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); 1472 switch (num) { 1473 case 0: 1474 if ((ic_myaddr = in_aton(ip)) == ANY) 1475 ic_myaddr = NONE; 1476 break; 1477 case 1: 1478 if ((ic_servaddr = in_aton(ip)) == ANY) 1479 ic_servaddr = NONE; 1480 break; 1481 case 2: 1482 if ((ic_gateway = in_aton(ip)) == ANY) 1483 ic_gateway = NONE; 1484 break; 1485 case 3: 1486 if ((ic_netmask = in_aton(ip)) == ANY) 1487 ic_netmask = NONE; 1488 break; 1489 case 4: 1490 if ((dp = strchr(ip, '.'))) { 1491 *dp++ = '\0'; 1492 strlcpy(utsname()->domainname, dp, 1493 sizeof(utsname()->domainname)); 1494 } 1495 strlcpy(utsname()->nodename, ip, 1496 sizeof(utsname()->nodename)); 1497 ic_host_name_set = 1; 1498 break; 1499 case 5: 1500 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1501 break; 1502 case 6: 1503 if (ic_proto_name(ip) == 0 && 1504 ic_myaddr == NONE) { 1505 ic_enable = 0; 1506 } 1507 break; 1508 } 1509 } 1510 ip = cp; 1511 num++; 1512 } 1513 1514 return 1; 1515 } 1516 1517 static int __init nfsaddrs_config_setup(char *addrs) 1518 { 1519 return ip_auto_config_setup(addrs); 1520 } 1521 1522 static int __init vendor_class_identifier_setup(char *addrs) 1523 { 1524 if (strlcpy(vendor_class_identifier, addrs, 1525 sizeof(vendor_class_identifier)) 1526 >= sizeof(vendor_class_identifier)) 1527 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"", 1528 vendor_class_identifier); 1529 return 1; 1530 } 1531 1532 __setup("ip=", ip_auto_config_setup); 1533 __setup("nfsaddrs=", nfsaddrs_config_setup); 1534 __setup("dhcpclass=", vendor_class_identifier_setup); 1535