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 u32 ic_dev_xid; /* Device under configuration */ 143 144 /* vendor class identifier */ 145 static char vendor_class_identifier[253] __initdata; 146 147 /* Persistent data: */ 148 149 static int ic_proto_used; /* Protocol used, if any */ 150 static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 151 static u8 ic_domain[64]; /* DNS (not NIS) domain name */ 152 153 /* 154 * Private state. 155 */ 156 157 /* Name of user-selected boot device */ 158 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 159 160 /* Protocols supported by available interfaces */ 161 static int ic_proto_have_if __initdata = 0; 162 163 /* MTU for boot device */ 164 static int ic_dev_mtu __initdata = 0; 165 166 #ifdef IPCONFIG_DYNAMIC 167 static DEFINE_SPINLOCK(ic_recv_lock); 168 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */ 169 #endif 170 #ifdef IPCONFIG_DHCP 171 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */ 172 #endif 173 174 175 /* 176 * Network devices 177 */ 178 179 struct ic_device { 180 struct ic_device *next; 181 struct net_device *dev; 182 unsigned short flags; 183 short able; 184 __be32 xid; 185 }; 186 187 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */ 188 static struct net_device *ic_dev __initdata = NULL; /* Selected device */ 189 190 static int __init ic_open_devs(void) 191 { 192 struct ic_device *d, **last; 193 struct net_device *dev; 194 unsigned short oflags; 195 196 last = &ic_first_dev; 197 rtnl_lock(); 198 199 /* bring loopback device up first */ 200 for_each_netdev(&init_net, dev) { 201 if (!(dev->flags & IFF_LOOPBACK)) 202 continue; 203 if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) 204 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); 205 } 206 207 for_each_netdev(&init_net, dev) { 208 if (dev->flags & IFF_LOOPBACK) 209 continue; 210 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 211 (!(dev->flags & IFF_LOOPBACK) && 212 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 213 strncmp(dev->name, "dummy", 5))) { 214 int able = 0; 215 if (dev->mtu >= 364) 216 able |= IC_BOOTP; 217 else 218 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu); 219 if (!(dev->flags & IFF_NOARP)) 220 able |= IC_RARP; 221 able &= ic_proto_enabled; 222 if (ic_proto_enabled && !able) 223 continue; 224 oflags = dev->flags; 225 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 226 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); 227 continue; 228 } 229 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 230 rtnl_unlock(); 231 return -1; 232 } 233 d->dev = dev; 234 *last = d; 235 last = &d->next; 236 d->flags = oflags; 237 d->able = able; 238 if (able & IC_BOOTP) 239 get_random_bytes(&d->xid, sizeof(__be32)); 240 else 241 d->xid = 0; 242 ic_proto_have_if |= able; 243 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", 244 dev->name, able, d->xid)); 245 } 246 } 247 rtnl_unlock(); 248 249 *last = NULL; 250 251 if (!ic_first_dev) { 252 if (user_dev_name[0]) 253 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name); 254 else 255 printk(KERN_ERR "IP-Config: No network devices available.\n"); 256 return -1; 257 } 258 return 0; 259 } 260 261 static void __init ic_close_devs(void) 262 { 263 struct ic_device *d, *next; 264 struct net_device *dev; 265 266 rtnl_lock(); 267 next = ic_first_dev; 268 while ((d = next)) { 269 next = d->next; 270 dev = d->dev; 271 if (dev != ic_dev) { 272 DBG(("IP-Config: Downing %s\n", dev->name)); 273 dev_change_flags(dev, d->flags); 274 } 275 kfree(d); 276 } 277 rtnl_unlock(); 278 } 279 280 /* 281 * Interface to various network functions. 282 */ 283 284 static inline void 285 set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) 286 { 287 sin->sin_family = AF_INET; 288 sin->sin_addr.s_addr = addr; 289 sin->sin_port = port; 290 } 291 292 static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg) 293 { 294 int res; 295 296 mm_segment_t oldfs = get_fs(); 297 set_fs(get_ds()); 298 res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 299 set_fs(oldfs); 300 return res; 301 } 302 303 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 304 { 305 int res; 306 307 mm_segment_t oldfs = get_fs(); 308 set_fs(get_ds()); 309 res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg); 310 set_fs(oldfs); 311 return res; 312 } 313 314 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 315 { 316 int res; 317 318 mm_segment_t oldfs = get_fs(); 319 set_fs(get_ds()); 320 res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); 321 set_fs(oldfs); 322 return res; 323 } 324 325 /* 326 * Set up interface addresses and routes. 327 */ 328 329 static int __init ic_setup_if(void) 330 { 331 struct ifreq ir; 332 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 333 int err; 334 335 memset(&ir, 0, sizeof(ir)); 336 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); 337 set_sockaddr(sin, ic_myaddr, 0); 338 if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) { 339 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err); 340 return -1; 341 } 342 set_sockaddr(sin, ic_netmask, 0); 343 if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 344 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err); 345 return -1; 346 } 347 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 348 if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 349 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err); 350 return -1; 351 } 352 /* Handle the case where we need non-standard MTU on the boot link (a network 353 * using jumbo frames, for instance). If we can't set the mtu, don't error 354 * out, we'll try to muddle along. 355 */ 356 if (ic_dev_mtu != 0) { 357 strcpy(ir.ifr_name, ic_dev->name); 358 ir.ifr_mtu = ic_dev_mtu; 359 if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0) 360 printk(KERN_ERR "IP-Config: Unable to set interface mtu to %d (%d).\n", 361 ic_dev_mtu, err); 362 } 363 return 0; 364 } 365 366 static int __init ic_setup_routes(void) 367 { 368 /* No need to setup device routes, only the default route... */ 369 370 if (ic_gateway != NONE) { 371 struct rtentry rm; 372 int err; 373 374 memset(&rm, 0, sizeof(rm)); 375 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 376 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n"); 377 return -1; 378 } 379 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 380 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 381 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 382 rm.rt_flags = RTF_UP | RTF_GATEWAY; 383 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 384 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err); 385 return -1; 386 } 387 } 388 389 return 0; 390 } 391 392 /* 393 * Fill in default values for all missing parameters. 394 */ 395 396 static int __init ic_defaults(void) 397 { 398 /* 399 * At this point we have no userspace running so need not 400 * claim locks on system_utsname 401 */ 402 403 if (!ic_host_name_set) 404 sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); 405 406 if (root_server_addr == NONE) 407 root_server_addr = ic_servaddr; 408 409 if (ic_netmask == NONE) { 410 if (IN_CLASSA(ntohl(ic_myaddr))) 411 ic_netmask = htonl(IN_CLASSA_NET); 412 else if (IN_CLASSB(ntohl(ic_myaddr))) 413 ic_netmask = htonl(IN_CLASSB_NET); 414 else if (IN_CLASSC(ntohl(ic_myaddr))) 415 ic_netmask = htonl(IN_CLASSC_NET); 416 else { 417 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n", 418 &ic_myaddr); 419 return -1; 420 } 421 printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask); 422 } 423 424 return 0; 425 } 426 427 /* 428 * RARP support. 429 */ 430 431 #ifdef IPCONFIG_RARP 432 433 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 434 435 static struct packet_type rarp_packet_type __initdata = { 436 .type = cpu_to_be16(ETH_P_RARP), 437 .func = ic_rarp_recv, 438 }; 439 440 static inline void __init ic_rarp_init(void) 441 { 442 dev_add_pack(&rarp_packet_type); 443 } 444 445 static inline void __init ic_rarp_cleanup(void) 446 { 447 dev_remove_pack(&rarp_packet_type); 448 } 449 450 /* 451 * Process received RARP packet. 452 */ 453 static int __init 454 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 455 { 456 struct arphdr *rarp; 457 unsigned char *rarp_ptr; 458 __be32 sip, tip; 459 unsigned char *sha, *tha; /* s for "source", t for "target" */ 460 struct ic_device *d; 461 462 if (!net_eq(dev_net(dev), &init_net)) 463 goto drop; 464 465 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 466 return NET_RX_DROP; 467 468 if (!pskb_may_pull(skb, sizeof(struct arphdr))) 469 goto drop; 470 471 /* Basic sanity checks can be done without the lock. */ 472 rarp = (struct arphdr *)skb_transport_header(skb); 473 474 /* If this test doesn't pass, it's not IP, or we should 475 * ignore it anyway. 476 */ 477 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 478 goto drop; 479 480 /* If it's not a RARP reply, delete it. */ 481 if (rarp->ar_op != htons(ARPOP_RREPLY)) 482 goto drop; 483 484 /* If it's not Ethernet, delete it. */ 485 if (rarp->ar_pro != htons(ETH_P_IP)) 486 goto drop; 487 488 if (!pskb_may_pull(skb, arp_hdr_len(dev))) 489 goto drop; 490 491 /* OK, it is all there and looks valid, process... */ 492 rarp = (struct arphdr *)skb_transport_header(skb); 493 rarp_ptr = (unsigned char *) (rarp + 1); 494 495 /* One reply at a time, please. */ 496 spin_lock(&ic_recv_lock); 497 498 /* If we already have a reply, just drop the packet */ 499 if (ic_got_reply) 500 goto drop_unlock; 501 502 /* Find the ic_device that the packet arrived on */ 503 d = ic_first_dev; 504 while (d && d->dev != dev) 505 d = d->next; 506 if (!d) 507 goto drop_unlock; /* should never happen */ 508 509 /* Extract variable-width fields */ 510 sha = rarp_ptr; 511 rarp_ptr += dev->addr_len; 512 memcpy(&sip, rarp_ptr, 4); 513 rarp_ptr += 4; 514 tha = rarp_ptr; 515 rarp_ptr += dev->addr_len; 516 memcpy(&tip, rarp_ptr, 4); 517 518 /* Discard packets which are not meant for us. */ 519 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 520 goto drop_unlock; 521 522 /* Discard packets which are not from specified server. */ 523 if (ic_servaddr != NONE && ic_servaddr != sip) 524 goto drop_unlock; 525 526 /* We have a winner! */ 527 ic_dev = dev; 528 if (ic_myaddr == NONE) 529 ic_myaddr = tip; 530 ic_servaddr = sip; 531 ic_got_reply = IC_RARP; 532 533 drop_unlock: 534 /* Show's over. Nothing to see here. */ 535 spin_unlock(&ic_recv_lock); 536 537 drop: 538 /* Throw the packet out. */ 539 kfree_skb(skb); 540 return 0; 541 } 542 543 544 /* 545 * Send RARP request packet over a single interface. 546 */ 547 static void __init ic_rarp_send_if(struct ic_device *d) 548 { 549 struct net_device *dev = d->dev; 550 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 551 dev->dev_addr, dev->dev_addr); 552 } 553 #endif 554 555 /* 556 * DHCP/BOOTP support. 557 */ 558 559 #ifdef IPCONFIG_BOOTP 560 561 struct bootp_pkt { /* BOOTP packet format */ 562 struct iphdr iph; /* IP header */ 563 struct udphdr udph; /* UDP header */ 564 u8 op; /* 1=request, 2=reply */ 565 u8 htype; /* HW address type */ 566 u8 hlen; /* HW address length */ 567 u8 hops; /* Used only by gateways */ 568 __be32 xid; /* Transaction ID */ 569 __be16 secs; /* Seconds since we started */ 570 __be16 flags; /* Just what it says */ 571 __be32 client_ip; /* Client's IP address if known */ 572 __be32 your_ip; /* Assigned IP address */ 573 __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 574 __be32 relay_ip; /* IP address of BOOTP relay */ 575 u8 hw_addr[16]; /* Client's HW address */ 576 u8 serv_name[64]; /* Server host name */ 577 u8 boot_file[128]; /* Name of boot file */ 578 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 579 }; 580 581 /* packet ops */ 582 #define BOOTP_REQUEST 1 583 #define BOOTP_REPLY 2 584 585 /* DHCP message types */ 586 #define DHCPDISCOVER 1 587 #define DHCPOFFER 2 588 #define DHCPREQUEST 3 589 #define DHCPDECLINE 4 590 #define DHCPACK 5 591 #define DHCPNAK 6 592 #define DHCPRELEASE 7 593 #define DHCPINFORM 8 594 595 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); 596 597 static struct packet_type bootp_packet_type __initdata = { 598 .type = cpu_to_be16(ETH_P_IP), 599 .func = ic_bootp_recv, 600 }; 601 602 603 /* 604 * Initialize DHCP/BOOTP extension fields in the request. 605 */ 606 607 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 608 609 #ifdef IPCONFIG_DHCP 610 611 static void __init 612 ic_dhcp_init_options(u8 *options) 613 { 614 u8 mt = ((ic_servaddr == NONE) 615 ? DHCPDISCOVER : DHCPREQUEST); 616 u8 *e = options; 617 int len; 618 619 #ifdef IPCONFIG_DEBUG 620 printk("DHCP: Sending message type %d\n", mt); 621 #endif 622 623 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 624 e += 4; 625 626 *e++ = 53; /* DHCP message type */ 627 *e++ = 1; 628 *e++ = mt; 629 630 if (mt == DHCPREQUEST) { 631 *e++ = 54; /* Server ID (IP address) */ 632 *e++ = 4; 633 memcpy(e, &ic_servaddr, 4); 634 e += 4; 635 636 *e++ = 50; /* Requested IP address */ 637 *e++ = 4; 638 memcpy(e, &ic_myaddr, 4); 639 e += 4; 640 } 641 642 /* always? */ 643 { 644 static const u8 ic_req_params[] = { 645 1, /* Subnet mask */ 646 3, /* Default gateway */ 647 6, /* DNS server */ 648 12, /* Host name */ 649 15, /* Domain name */ 650 17, /* Boot path */ 651 26, /* MTU */ 652 40, /* NIS domain name */ 653 }; 654 655 *e++ = 55; /* Parameter request list */ 656 *e++ = sizeof(ic_req_params); 657 memcpy(e, ic_req_params, sizeof(ic_req_params)); 658 e += sizeof(ic_req_params); 659 660 if (*vendor_class_identifier) { 661 printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n", 662 vendor_class_identifier); 663 *e++ = 60; /* Class-identifier */ 664 len = strlen(vendor_class_identifier); 665 *e++ = len; 666 memcpy(e, vendor_class_identifier, len); 667 e += len; 668 } 669 } 670 671 *e++ = 255; /* End of the list */ 672 } 673 674 #endif /* IPCONFIG_DHCP */ 675 676 static void __init ic_bootp_init_ext(u8 *e) 677 { 678 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 679 e += 4; 680 *e++ = 1; /* Subnet mask request */ 681 *e++ = 4; 682 e += 4; 683 *e++ = 3; /* Default gateway request */ 684 *e++ = 4; 685 e += 4; 686 *e++ = 5; /* Name server request */ 687 *e++ = 8; 688 e += 8; 689 *e++ = 12; /* Host name request */ 690 *e++ = 32; 691 e += 32; 692 *e++ = 40; /* NIS Domain name request */ 693 *e++ = 32; 694 e += 32; 695 *e++ = 17; /* Boot path */ 696 *e++ = 40; 697 e += 40; 698 699 *e++ = 57; /* set extension buffer size for reply */ 700 *e++ = 2; 701 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 702 *e++ = 150; 703 704 *e++ = 255; /* End of the list */ 705 } 706 707 708 /* 709 * Initialize the DHCP/BOOTP mechanism. 710 */ 711 static inline void __init ic_bootp_init(void) 712 { 713 int i; 714 715 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 716 ic_nameservers[i] = NONE; 717 718 dev_add_pack(&bootp_packet_type); 719 } 720 721 722 /* 723 * DHCP/BOOTP cleanup. 724 */ 725 static inline void __init ic_bootp_cleanup(void) 726 { 727 dev_remove_pack(&bootp_packet_type); 728 } 729 730 731 /* 732 * Send DHCP/BOOTP request to single interface. 733 */ 734 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 735 { 736 struct net_device *dev = d->dev; 737 struct sk_buff *skb; 738 struct bootp_pkt *b; 739 struct iphdr *h; 740 741 /* Allocate packet */ 742 skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15, 743 GFP_KERNEL); 744 if (!skb) 745 return; 746 skb_reserve(skb, LL_RESERVED_SPACE(dev)); 747 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 748 memset(b, 0, sizeof(struct bootp_pkt)); 749 750 /* Construct IP header */ 751 skb_reset_network_header(skb); 752 h = ip_hdr(skb); 753 h->version = 4; 754 h->ihl = 5; 755 h->tot_len = htons(sizeof(struct bootp_pkt)); 756 h->frag_off = htons(IP_DF); 757 h->ttl = 64; 758 h->protocol = IPPROTO_UDP; 759 h->daddr = htonl(INADDR_BROADCAST); 760 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 761 762 /* Construct UDP header */ 763 b->udph.source = htons(68); 764 b->udph.dest = htons(67); 765 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 766 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 767 768 /* Construct DHCP/BOOTP header */ 769 b->op = BOOTP_REQUEST; 770 if (dev->type < 256) /* check for false types */ 771 b->htype = dev->type; 772 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ 773 b->htype = ARPHRD_IEEE802; 774 else if (dev->type == ARPHRD_FDDI) 775 b->htype = ARPHRD_ETHER; 776 else { 777 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 778 b->htype = dev->type; /* can cause undefined behavior */ 779 } 780 781 /* server_ip and your_ip address are both already zero per RFC2131 */ 782 b->hlen = dev->addr_len; 783 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 784 b->secs = htons(jiffies_diff / HZ); 785 b->xid = d->xid; 786 787 /* add DHCP options or BOOTP extensions */ 788 #ifdef IPCONFIG_DHCP 789 if (ic_proto_enabled & IC_USE_DHCP) 790 ic_dhcp_init_options(b->exten); 791 else 792 #endif 793 ic_bootp_init_ext(b->exten); 794 795 /* Chain packet down the line... */ 796 skb->dev = dev; 797 skb->protocol = htons(ETH_P_IP); 798 if (dev_hard_header(skb, dev, ntohs(skb->protocol), 799 dev->broadcast, dev->dev_addr, skb->len) < 0 || 800 dev_queue_xmit(skb) < 0) 801 printk("E"); 802 } 803 804 805 /* 806 * Copy BOOTP-supplied string if not already set. 807 */ 808 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 809 { 810 if (!len) 811 return 0; 812 if (len > max-1) 813 len = max-1; 814 memcpy(dest, src, len); 815 dest[len] = '\0'; 816 return 1; 817 } 818 819 820 /* 821 * Process BOOTP extensions. 822 */ 823 static void __init ic_do_bootp_ext(u8 *ext) 824 { 825 u8 servers; 826 int i; 827 u16 mtu; 828 829 #ifdef IPCONFIG_DEBUG 830 u8 *c; 831 832 printk("DHCP/BOOTP: Got extension %d:",*ext); 833 for (c=ext+2; c<ext+2+ext[1]; c++) 834 printk(" %02x", *c); 835 printk("\n"); 836 #endif 837 838 switch (*ext++) { 839 case 1: /* Subnet mask */ 840 if (ic_netmask == NONE) 841 memcpy(&ic_netmask, ext+1, 4); 842 break; 843 case 3: /* Default gateway */ 844 if (ic_gateway == NONE) 845 memcpy(&ic_gateway, ext+1, 4); 846 break; 847 case 6: /* DNS server */ 848 servers= *ext/4; 849 if (servers > CONF_NAMESERVERS_MAX) 850 servers = CONF_NAMESERVERS_MAX; 851 for (i = 0; i < servers; i++) { 852 if (ic_nameservers[i] == NONE) 853 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 854 } 855 break; 856 case 12: /* Host name */ 857 ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN); 858 ic_host_name_set = 1; 859 break; 860 case 15: /* Domain name (DNS) */ 861 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 862 break; 863 case 17: /* Root path */ 864 if (!root_server_path[0]) 865 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path)); 866 break; 867 case 26: /* Interface MTU */ 868 memcpy(&mtu, ext+1, sizeof(mtu)); 869 ic_dev_mtu = ntohs(mtu); 870 break; 871 case 40: /* NIS Domain name (_not_ DNS) */ 872 ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN); 873 break; 874 } 875 } 876 877 878 /* 879 * Receive BOOTP reply. 880 */ 881 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) 882 { 883 struct bootp_pkt *b; 884 struct iphdr *h; 885 struct ic_device *d; 886 int len, ext_len; 887 888 if (!net_eq(dev_net(dev), &init_net)) 889 goto drop; 890 891 /* Perform verifications before taking the lock. */ 892 if (skb->pkt_type == PACKET_OTHERHOST) 893 goto drop; 894 895 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 896 return NET_RX_DROP; 897 898 if (!pskb_may_pull(skb, 899 sizeof(struct iphdr) + 900 sizeof(struct udphdr))) 901 goto drop; 902 903 b = (struct bootp_pkt *)skb_network_header(skb); 904 h = &b->iph; 905 906 if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) 907 goto drop; 908 909 /* Fragments are not supported */ 910 if (h->frag_off & htons(IP_OFFSET | IP_MF)) { 911 if (net_ratelimit()) 912 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " 913 "reply.\n"); 914 goto drop; 915 } 916 917 if (skb->len < ntohs(h->tot_len)) 918 goto drop; 919 920 if (ip_fast_csum((char *) h, h->ihl)) 921 goto drop; 922 923 if (b->udph.source != htons(67) || b->udph.dest != htons(68)) 924 goto drop; 925 926 if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 927 goto drop; 928 929 len = ntohs(b->udph.len) - sizeof(struct udphdr); 930 ext_len = len - (sizeof(*b) - 931 sizeof(struct iphdr) - 932 sizeof(struct udphdr) - 933 sizeof(b->exten)); 934 if (ext_len < 0) 935 goto drop; 936 937 /* Ok the front looks good, make sure we can get at the rest. */ 938 if (!pskb_may_pull(skb, skb->len)) 939 goto drop; 940 941 b = (struct bootp_pkt *)skb_network_header(skb); 942 h = &b->iph; 943 944 /* One reply at a time, please. */ 945 spin_lock(&ic_recv_lock); 946 947 /* If we already have a reply, just drop the packet */ 948 if (ic_got_reply) 949 goto drop_unlock; 950 951 /* Find the ic_device that the packet arrived on */ 952 d = ic_first_dev; 953 while (d && d->dev != dev) 954 d = d->next; 955 if (!d) 956 goto drop_unlock; /* should never happen */ 957 958 /* Is it a reply to our BOOTP request? */ 959 if (b->op != BOOTP_REPLY || 960 b->xid != d->xid) { 961 if (net_ratelimit()) 962 printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " 963 "op[%x] xid[%x]\n", 964 b->op, b->xid); 965 goto drop_unlock; 966 } 967 968 /* Is it a reply for the device we are configuring? */ 969 if (b->xid != ic_dev_xid) { 970 if (net_ratelimit()) 971 printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet \n"); 972 goto drop_unlock; 973 } 974 975 /* Parse extensions */ 976 if (ext_len >= 4 && 977 !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 978 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 979 u8 *ext; 980 981 #ifdef IPCONFIG_DHCP 982 if (ic_proto_enabled & IC_USE_DHCP) { 983 __be32 server_id = NONE; 984 int mt = 0; 985 986 ext = &b->exten[4]; 987 while (ext < end && *ext != 0xff) { 988 u8 *opt = ext++; 989 if (*opt == 0) /* Padding */ 990 continue; 991 ext += *ext + 1; 992 if (ext >= end) 993 break; 994 switch (*opt) { 995 case 53: /* Message type */ 996 if (opt[1]) 997 mt = opt[2]; 998 break; 999 case 54: /* Server ID (IP address) */ 1000 if (opt[1] >= 4) 1001 memcpy(&server_id, opt + 2, 4); 1002 break; 1003 } 1004 } 1005 1006 #ifdef IPCONFIG_DEBUG 1007 printk("DHCP: Got message type %d\n", mt); 1008 #endif 1009 1010 switch (mt) { 1011 case DHCPOFFER: 1012 /* While in the process of accepting one offer, 1013 * ignore all others. 1014 */ 1015 if (ic_myaddr != NONE) 1016 goto drop_unlock; 1017 1018 /* Let's accept that offer. */ 1019 ic_myaddr = b->your_ip; 1020 ic_servaddr = server_id; 1021 #ifdef IPCONFIG_DEBUG 1022 printk("DHCP: Offered address %pI4 by server %pI4\n", 1023 &ic_myaddr, &ic_servaddr); 1024 #endif 1025 /* The DHCP indicated server address takes 1026 * precedence over the bootp header one if 1027 * they are different. 1028 */ 1029 if ((server_id != NONE) && 1030 (b->server_ip != server_id)) 1031 b->server_ip = ic_servaddr; 1032 break; 1033 1034 case DHCPACK: 1035 if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) 1036 goto drop_unlock; 1037 1038 /* Yeah! */ 1039 break; 1040 1041 default: 1042 /* Urque. Forget it*/ 1043 ic_myaddr = NONE; 1044 ic_servaddr = NONE; 1045 goto drop_unlock; 1046 } 1047 1048 ic_dhcp_msgtype = mt; 1049 1050 } 1051 #endif /* IPCONFIG_DHCP */ 1052 1053 ext = &b->exten[4]; 1054 while (ext < end && *ext != 0xff) { 1055 u8 *opt = ext++; 1056 if (*opt == 0) /* Padding */ 1057 continue; 1058 ext += *ext + 1; 1059 if (ext < end) 1060 ic_do_bootp_ext(opt); 1061 } 1062 } 1063 1064 /* We have a winner! */ 1065 ic_dev = dev; 1066 ic_myaddr = b->your_ip; 1067 ic_servaddr = b->server_ip; 1068 if (ic_gateway == NONE && b->relay_ip) 1069 ic_gateway = b->relay_ip; 1070 if (ic_nameservers[0] == NONE) 1071 ic_nameservers[0] = ic_servaddr; 1072 ic_got_reply = IC_BOOTP; 1073 1074 drop_unlock: 1075 /* Show's over. Nothing to see here. */ 1076 spin_unlock(&ic_recv_lock); 1077 1078 drop: 1079 /* Throw the packet out. */ 1080 kfree_skb(skb); 1081 1082 return 0; 1083 } 1084 1085 1086 #endif 1087 1088 1089 /* 1090 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 1091 */ 1092 1093 #ifdef IPCONFIG_DYNAMIC 1094 1095 static int __init ic_dynamic(void) 1096 { 1097 int retries; 1098 struct ic_device *d; 1099 unsigned long start_jiffies, timeout, jiff; 1100 int do_bootp = ic_proto_have_if & IC_BOOTP; 1101 int do_rarp = ic_proto_have_if & IC_RARP; 1102 1103 /* 1104 * If none of DHCP/BOOTP/RARP was selected, return with an error. 1105 * This routine gets only called when some pieces of information 1106 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 1107 */ 1108 if (!ic_proto_enabled) { 1109 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1110 return -1; 1111 } 1112 1113 #ifdef IPCONFIG_BOOTP 1114 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 1115 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); 1116 #endif 1117 #ifdef IPCONFIG_RARP 1118 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 1119 printk(KERN_ERR "RARP: No suitable device found.\n"); 1120 #endif 1121 1122 if (!ic_proto_have_if) 1123 /* Error message already printed */ 1124 return -1; 1125 1126 /* 1127 * Setup protocols 1128 */ 1129 #ifdef IPCONFIG_BOOTP 1130 if (do_bootp) 1131 ic_bootp_init(); 1132 #endif 1133 #ifdef IPCONFIG_RARP 1134 if (do_rarp) 1135 ic_rarp_init(); 1136 #endif 1137 1138 /* 1139 * Send requests and wait, until we get an answer. This loop 1140 * seems to be a terrible waste of CPU time, but actually there is 1141 * only one process running at all, so we don't need to use any 1142 * scheduler functions. 1143 * [Actually we could now, but the nothing else running note still 1144 * applies.. - AC] 1145 */ 1146 printk(KERN_NOTICE "Sending %s%s%s requests .", 1147 do_bootp 1148 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 1149 (do_bootp && do_rarp) ? " and " : "", 1150 do_rarp ? "RARP" : ""); 1151 1152 start_jiffies = jiffies; 1153 d = ic_first_dev; 1154 retries = CONF_SEND_RETRIES; 1155 get_random_bytes(&timeout, sizeof(timeout)); 1156 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); 1157 for (;;) { 1158 /* Track the device we are configuring */ 1159 ic_dev_xid = d->xid; 1160 1161 #ifdef IPCONFIG_BOOTP 1162 if (do_bootp && (d->able & IC_BOOTP)) 1163 ic_bootp_send_if(d, jiffies - start_jiffies); 1164 #endif 1165 #ifdef IPCONFIG_RARP 1166 if (do_rarp && (d->able & IC_RARP)) 1167 ic_rarp_send_if(d); 1168 #endif 1169 1170 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 1171 while (time_before(jiffies, jiff) && !ic_got_reply) 1172 schedule_timeout_uninterruptible(1); 1173 #ifdef IPCONFIG_DHCP 1174 /* DHCP isn't done until we get a DHCPACK. */ 1175 if ((ic_got_reply & IC_BOOTP) && 1176 (ic_proto_enabled & IC_USE_DHCP) && 1177 ic_dhcp_msgtype != DHCPACK) { 1178 ic_got_reply = 0; 1179 printk(","); 1180 continue; 1181 } 1182 #endif /* IPCONFIG_DHCP */ 1183 1184 if (ic_got_reply) { 1185 printk(" OK\n"); 1186 break; 1187 } 1188 1189 if ((d = d->next)) 1190 continue; 1191 1192 if (! --retries) { 1193 printk(" timed out!\n"); 1194 break; 1195 } 1196 1197 d = ic_first_dev; 1198 1199 timeout = timeout CONF_TIMEOUT_MULT; 1200 if (timeout > CONF_TIMEOUT_MAX) 1201 timeout = CONF_TIMEOUT_MAX; 1202 1203 printk("."); 1204 } 1205 1206 #ifdef IPCONFIG_BOOTP 1207 if (do_bootp) 1208 ic_bootp_cleanup(); 1209 #endif 1210 #ifdef IPCONFIG_RARP 1211 if (do_rarp) 1212 ic_rarp_cleanup(); 1213 #endif 1214 1215 if (!ic_got_reply) { 1216 ic_myaddr = NONE; 1217 return -1; 1218 } 1219 1220 printk("IP-Config: Got %s answer from %pI4, ", 1221 ((ic_got_reply & IC_RARP) ? "RARP" 1222 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 1223 &ic_servaddr); 1224 printk("my address is %pI4\n", &ic_myaddr); 1225 1226 return 0; 1227 } 1228 1229 #endif /* IPCONFIG_DYNAMIC */ 1230 1231 #ifdef CONFIG_PROC_FS 1232 1233 static int pnp_seq_show(struct seq_file *seq, void *v) 1234 { 1235 int i; 1236 1237 if (ic_proto_used & IC_PROTO) 1238 seq_printf(seq, "#PROTO: %s\n", 1239 (ic_proto_used & IC_RARP) ? "RARP" 1240 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 1241 else 1242 seq_puts(seq, "#MANUAL\n"); 1243 1244 if (ic_domain[0]) 1245 seq_printf(seq, 1246 "domain %s\n", ic_domain); 1247 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 1248 if (ic_nameservers[i] != NONE) 1249 seq_printf(seq, "nameserver %pI4\n", 1250 &ic_nameservers[i]); 1251 } 1252 if (ic_servaddr != NONE) 1253 seq_printf(seq, "bootserver %pI4\n", 1254 &ic_servaddr); 1255 return 0; 1256 } 1257 1258 static int pnp_seq_open(struct inode *indoe, struct file *file) 1259 { 1260 return single_open(file, pnp_seq_show, NULL); 1261 } 1262 1263 static const struct file_operations pnp_seq_fops = { 1264 .owner = THIS_MODULE, 1265 .open = pnp_seq_open, 1266 .read = seq_read, 1267 .llseek = seq_lseek, 1268 .release = single_release, 1269 }; 1270 #endif /* CONFIG_PROC_FS */ 1271 1272 /* 1273 * Extract IP address from the parameter string if needed. Note that we 1274 * need to have root_server_addr set _before_ IPConfig gets called as it 1275 * can override it. 1276 */ 1277 __be32 __init root_nfs_parse_addr(char *name) 1278 { 1279 __be32 addr; 1280 int octets = 0; 1281 char *cp, *cq; 1282 1283 cp = cq = name; 1284 while (octets < 4) { 1285 while (*cp >= '0' && *cp <= '9') 1286 cp++; 1287 if (cp == cq || cp - cq > 3) 1288 break; 1289 if (*cp == '.' || octets == 3) 1290 octets++; 1291 if (octets < 4) 1292 cp++; 1293 cq = cp; 1294 } 1295 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 1296 if (*cp == ':') 1297 *cp++ = '\0'; 1298 addr = in_aton(name); 1299 memmove(name, cp, strlen(cp) + 1); 1300 } else 1301 addr = NONE; 1302 1303 return addr; 1304 } 1305 1306 /* 1307 * IP Autoconfig dispatcher. 1308 */ 1309 1310 static int __init ip_auto_config(void) 1311 { 1312 __be32 addr; 1313 #ifdef IPCONFIG_DYNAMIC 1314 int retries = CONF_OPEN_RETRIES; 1315 #endif 1316 1317 #ifdef CONFIG_PROC_FS 1318 proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops); 1319 #endif /* CONFIG_PROC_FS */ 1320 1321 if (!ic_enable) 1322 return 0; 1323 1324 DBG(("IP-Config: Entered.\n")); 1325 #ifdef IPCONFIG_DYNAMIC 1326 try_try_again: 1327 #endif 1328 /* Give hardware a chance to settle */ 1329 msleep(CONF_PRE_OPEN); 1330 1331 /* Setup all network devices */ 1332 if (ic_open_devs() < 0) 1333 return -1; 1334 1335 /* Give drivers a chance to settle */ 1336 ssleep(CONF_POST_OPEN); 1337 1338 /* 1339 * If the config information is insufficient (e.g., our IP address or 1340 * IP address of the boot server is missing or we have multiple network 1341 * interfaces and no default was set), use BOOTP or RARP to get the 1342 * missing values. 1343 */ 1344 if (ic_myaddr == NONE || 1345 #ifdef CONFIG_ROOT_NFS 1346 (root_server_addr == NONE && 1347 ic_servaddr == NONE && 1348 ROOT_DEV == Root_NFS) || 1349 #endif 1350 ic_first_dev->next) { 1351 #ifdef IPCONFIG_DYNAMIC 1352 if (ic_dynamic() < 0) { 1353 ic_close_devs(); 1354 1355 /* 1356 * I don't know why, but sometimes the 1357 * eepro100 driver (at least) gets upset and 1358 * doesn't work the first time it's opened. 1359 * But then if you close it and reopen it, it 1360 * works just fine. So we need to try that at 1361 * least once before giving up. 1362 * 1363 * Also, if the root will be NFS-mounted, we 1364 * have nowhere to go if DHCP fails. So we 1365 * just have to keep trying forever. 1366 * 1367 * -- Chip 1368 */ 1369 #ifdef CONFIG_ROOT_NFS 1370 if (ROOT_DEV == Root_NFS) { 1371 printk(KERN_ERR 1372 "IP-Config: Retrying forever (NFS root)...\n"); 1373 goto try_try_again; 1374 } 1375 #endif 1376 1377 if (--retries) { 1378 printk(KERN_ERR 1379 "IP-Config: Reopening network devices...\n"); 1380 goto try_try_again; 1381 } 1382 1383 /* Oh, well. At least we tried. */ 1384 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); 1385 return -1; 1386 } 1387 #else /* !DYNAMIC */ 1388 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 1389 ic_close_devs(); 1390 return -1; 1391 #endif /* IPCONFIG_DYNAMIC */ 1392 } else { 1393 /* Device selected manually or only one device -> use it */ 1394 ic_dev = ic_first_dev->dev; 1395 } 1396 1397 addr = root_nfs_parse_addr(root_server_path); 1398 if (root_server_addr == NONE) 1399 root_server_addr = addr; 1400 1401 /* 1402 * Use defaults whereever applicable. 1403 */ 1404 if (ic_defaults() < 0) 1405 return -1; 1406 1407 /* 1408 * Close all network devices except the device we've 1409 * autoconfigured and set up routes. 1410 */ 1411 ic_close_devs(); 1412 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 1413 return -1; 1414 1415 /* 1416 * Record which protocol was actually used. 1417 */ 1418 #ifdef IPCONFIG_DYNAMIC 1419 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 1420 #endif 1421 1422 #ifndef IPCONFIG_SILENT 1423 /* 1424 * Clue in the operator. 1425 */ 1426 printk("IP-Config: Complete:"); 1427 printk("\n device=%s", ic_dev->name); 1428 printk(", addr=%pI4", &ic_myaddr); 1429 printk(", mask=%pI4", &ic_netmask); 1430 printk(", gw=%pI4", &ic_gateway); 1431 printk(",\n host=%s, domain=%s, nis-domain=%s", 1432 utsname()->nodename, ic_domain, utsname()->domainname); 1433 printk(",\n bootserver=%pI4", &ic_servaddr); 1434 printk(", rootserver=%pI4", &root_server_addr); 1435 printk(", rootpath=%s", root_server_path); 1436 if (ic_dev_mtu) 1437 printk(", mtu=%d", ic_dev_mtu); 1438 printk("\n"); 1439 #endif /* !SILENT */ 1440 1441 return 0; 1442 } 1443 1444 late_initcall(ip_auto_config); 1445 1446 1447 /* 1448 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 1449 * command line parameter. See Documentation/filesystems/nfs/nfsroot.txt. 1450 */ 1451 static int __init ic_proto_name(char *name) 1452 { 1453 if (!strcmp(name, "on") || !strcmp(name, "any")) { 1454 return 1; 1455 } 1456 if (!strcmp(name, "off") || !strcmp(name, "none")) { 1457 return 0; 1458 } 1459 #ifdef CONFIG_IP_PNP_DHCP 1460 else if (!strcmp(name, "dhcp")) { 1461 ic_proto_enabled &= ~IC_RARP; 1462 return 1; 1463 } 1464 #endif 1465 #ifdef CONFIG_IP_PNP_BOOTP 1466 else if (!strcmp(name, "bootp")) { 1467 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 1468 return 1; 1469 } 1470 #endif 1471 #ifdef CONFIG_IP_PNP_RARP 1472 else if (!strcmp(name, "rarp")) { 1473 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 1474 return 1; 1475 } 1476 #endif 1477 #ifdef IPCONFIG_DYNAMIC 1478 else if (!strcmp(name, "both")) { 1479 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 1480 return 1; 1481 } 1482 #endif 1483 return 0; 1484 } 1485 1486 static int __init ip_auto_config_setup(char *addrs) 1487 { 1488 char *cp, *ip, *dp; 1489 int num = 0; 1490 1491 ic_set_manually = 1; 1492 ic_enable = 1; 1493 1494 /* 1495 * If any dhcp, bootp etc options are set, leave autoconfig on 1496 * and skip the below static IP processing. 1497 */ 1498 if (ic_proto_name(addrs)) 1499 return 1; 1500 1501 /* If no static IP is given, turn off autoconfig and bail. */ 1502 if (*addrs == 0 || 1503 strcmp(addrs, "off") == 0 || 1504 strcmp(addrs, "none") == 0) { 1505 ic_enable = 0; 1506 return 1; 1507 } 1508 1509 /* Parse string for static IP assignment. */ 1510 ip = addrs; 1511 while (ip && *ip) { 1512 if ((cp = strchr(ip, ':'))) 1513 *cp++ = '\0'; 1514 if (strlen(ip) > 0) { 1515 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); 1516 switch (num) { 1517 case 0: 1518 if ((ic_myaddr = in_aton(ip)) == ANY) 1519 ic_myaddr = NONE; 1520 break; 1521 case 1: 1522 if ((ic_servaddr = in_aton(ip)) == ANY) 1523 ic_servaddr = NONE; 1524 break; 1525 case 2: 1526 if ((ic_gateway = in_aton(ip)) == ANY) 1527 ic_gateway = NONE; 1528 break; 1529 case 3: 1530 if ((ic_netmask = in_aton(ip)) == ANY) 1531 ic_netmask = NONE; 1532 break; 1533 case 4: 1534 if ((dp = strchr(ip, '.'))) { 1535 *dp++ = '\0'; 1536 strlcpy(utsname()->domainname, dp, 1537 sizeof(utsname()->domainname)); 1538 } 1539 strlcpy(utsname()->nodename, ip, 1540 sizeof(utsname()->nodename)); 1541 ic_host_name_set = 1; 1542 break; 1543 case 5: 1544 strlcpy(user_dev_name, ip, sizeof(user_dev_name)); 1545 break; 1546 case 6: 1547 if (ic_proto_name(ip) == 0 && 1548 ic_myaddr == NONE) { 1549 ic_enable = 0; 1550 } 1551 break; 1552 } 1553 } 1554 ip = cp; 1555 num++; 1556 } 1557 1558 return 1; 1559 } 1560 1561 static int __init nfsaddrs_config_setup(char *addrs) 1562 { 1563 return ip_auto_config_setup(addrs); 1564 } 1565 1566 static int __init vendor_class_identifier_setup(char *addrs) 1567 { 1568 if (strlcpy(vendor_class_identifier, addrs, 1569 sizeof(vendor_class_identifier)) 1570 >= sizeof(vendor_class_identifier)) 1571 printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"", 1572 vendor_class_identifier); 1573 return 1; 1574 } 1575 1576 __setup("ip=", ip_auto_config_setup); 1577 __setup("nfsaddrs=", nfsaddrs_config_setup); 1578 __setup("dhcpclass=", vendor_class_identifier_setup); 1579