Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 | /*
* $Id: ipconfig.c,v 1.20.2.1 1999/06/28 11:33:27 davem Exp $
*
* Automatic Configuration of IP -- use BOOTP or RARP or user-supplied
* information to configure own IP address and routes.
*
* Copyright (C) 1996--1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
*
* Derived from network configuration code in fs/nfs/nfsroot.c,
* originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
*
* BOOTP rewritten to construct and analyse packets itself instead
* of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
* -- MJ, December 1998
*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/random.h>
#include <linux/init.h>
#include <linux/utsname.h>
#include <linux/in.h>
#include <linux/if.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/socket.h>
#include <linux/route.h>
#include <linux/udp.h>
#include <net/arp.h>
#include <net/ip.h>
#include <net/ipconfig.h>
#include <asm/segment.h>
#include <asm/uaccess.h>
#include <asm/checksum.h>
/* Define this to allow debugging output */
#undef IPCONFIG_DEBUG
#ifdef IPCONFIG_DEBUG
#define DBG(x) printk x
#else
#define DBG(x) do { } while(0)
#endif
/* Define the timeout for waiting for a RARP/BOOTP reply */
#define CONF_BASE_TIMEOUT (HZ*5) /* Initial timeout: 5 seconds */
#define CONF_RETRIES 10 /* 10 retries */
#define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
#define CONF_TIMEOUT_MULT *5/4 /* Rate of timeout growth */
#define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
/* IP configuration */
static char user_dev_name[IFNAMSIZ] __initdata = { 0, };/* Name of user-selected boot device */
u32 ic_myaddr __initdata = INADDR_NONE; /* My IP address */
u32 ic_servaddr __initdata = INADDR_NONE; /* Server IP address */
u32 ic_gateway __initdata = INADDR_NONE; /* Gateway IP address */
u32 ic_netmask __initdata = INADDR_NONE; /* Netmask for local subnet */
int ic_enable __initdata = 1; /* Automatic IP configuration enabled */
int ic_host_name_set __initdata = 0; /* Host name configured manually */
int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
u32 root_server_addr __initdata = INADDR_NONE; /* Address of boot server */
u8 root_server_path[256] __initdata = { 0, }; /* Path to mount as root */
#if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_RARP)
#define CONFIG_IP_PNP_DYNAMIC
static int ic_proto_enabled __initdata = 0 /* Protocols enabled */
#ifdef CONFIG_IP_PNP_BOOTP
| IC_BOOTP
#endif
#ifdef CONFIG_IP_PNP_RARP
| IC_RARP
#endif
;
static int ic_got_reply __initdata = 0; /* Protocol(s) we got reply from */
#else
static int ic_proto_enabled __initdata = 0;
#endif
static int ic_proto_have_if __initdata = 0;
/*
* Network devices
*/
struct ic_device {
struct ic_device *next;
struct device *dev;
unsigned short flags;
int able;
};
static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
static struct device *ic_dev __initdata = NULL; /* Selected device */
static int __init ic_open_devs(void)
{
struct ic_device *d, **last;
struct device *dev;
unsigned short oflags;
last = &ic_first_dev;
for (dev = dev_base; dev; dev = dev->next)
if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
(!(dev->flags & IFF_LOOPBACK) &&
(dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
strncmp(dev->name, "dummy", 5))) {
int able = 0;
if (dev->mtu >= 364)
able |= IC_BOOTP;
else
printk(KERN_WARNING "BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
if (!(dev->flags & IFF_NOARP))
able |= IC_RARP;
able &= ic_proto_enabled;
if (ic_proto_enabled && !able)
continue;
oflags = dev->flags;
if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name);
continue;
}
if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL)))
return -1;
d->dev = dev;
*last = d;
last = &d->next;
d->flags = oflags;
d->able = able;
ic_proto_have_if |= able;
DBG(("IP-Config: Opened %s (able=%d)\n", dev->name, able));
}
*last = NULL;
if (!ic_first_dev) {
if (user_dev_name[0])
printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name);
else
printk(KERN_ERR "IP-Config: No network devices available.\n");
return -1;
}
return 0;
}
static void __init ic_close_devs(void)
{
struct ic_device *d, *next;
struct device *dev;
next = ic_first_dev;
while ((d = next)) {
next = d->next;
dev = d->dev;
if (dev != ic_dev) {
DBG(("IP-Config: Downing %s\n", dev->name));
dev_change_flags(dev, d->flags);
}
kfree_s(d, sizeof(struct ic_device));
}
}
/*
* Interface to various network functions.
*/
static inline void
set_sockaddr(struct sockaddr_in *sin, u32 addr, u16 port)
{
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = addr;
sin->sin_port = port;
}
static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
{
int res;
mm_segment_t oldfs = get_fs();
set_fs(get_ds());
res = devinet_ioctl(cmd, arg);
set_fs(oldfs);
return res;
}
static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
{
int res;
mm_segment_t oldfs = get_fs();
set_fs(get_ds());
res = ip_rt_ioctl(cmd, arg);
set_fs(oldfs);
return res;
}
/*
* Set up interface addresses and routes.
*/
static int __init ic_setup_if(void)
{
struct ifreq ir;
struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
int err;
memset(&ir, 0, sizeof(ir));
strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name);
set_sockaddr(sin, ic_myaddr, 0);
if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) {
printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err);
return -1;
}
set_sockaddr(sin, ic_netmask, 0);
if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err);
return -1;
}
set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err);
return -1;
}
return 0;
}
static int __init ic_setup_routes(void)
{
/* No need to setup device routes, only the default route... */
if (ic_gateway != INADDR_NONE) {
struct rtentry rm;
int err;
memset(&rm, 0, sizeof(rm));
if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n");
return -1;
}
set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
rm.rt_flags = RTF_UP | RTF_GATEWAY;
if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err);
return -1;
}
}
return 0;
}
/*
* Fill in default values for all missing parameters.
*/
static int __init ic_defaults(void)
{
/*
* At this point we have no userspace running so need not
* claim locks on system_utsname
*/
if (!ic_host_name_set)
strcpy(system_utsname.nodename, in_ntoa(ic_myaddr));
if (root_server_addr == INADDR_NONE)
root_server_addr = ic_servaddr;
if (ic_netmask == INADDR_NONE) {
if (IN_CLASSA(ntohl(ic_myaddr)))
ic_netmask = htonl(IN_CLASSA_NET);
else if (IN_CLASSB(ntohl(ic_myaddr)))
ic_netmask = htonl(IN_CLASSB_NET);
else if (IN_CLASSC(ntohl(ic_myaddr)))
ic_netmask = htonl(IN_CLASSC_NET);
else {
printk(KERN_ERR "IP-Config: Unable to guess netmask for address %08x\n", ic_myaddr);
return -1;
}
printk("IP-Config: Guessing netmask %s\n", in_ntoa(ic_netmask));
}
return 0;
}
/*
* RARP support.
*/
#ifdef CONFIG_IP_PNP_RARP
static int ic_rarp_recv(struct sk_buff *skb, struct device *dev, struct packet_type *pt);
static struct packet_type rarp_packet_type __initdata = {
__constant_htons(ETH_P_RARP),
NULL, /* Listen to all devices */
ic_rarp_recv,
NULL,
NULL
};
static inline void ic_rarp_init(void)
{
dev_add_pack(&rarp_packet_type);
}
static inline void ic_rarp_cleanup(void)
{
dev_remove_pack(&rarp_packet_type);
}
/*
* Process received RARP packet.
*/
static int __init
ic_rarp_recv(struct sk_buff *skb, struct device *dev, struct packet_type *pt)
{
struct arphdr *rarp = (struct arphdr *)skb->h.raw;
unsigned char *rarp_ptr = (unsigned char *) (rarp + 1);
unsigned long sip, tip;
unsigned char *sha, *tha; /* s for "source", t for "target" */
/* If we already have a reply, just drop the packet */
if (ic_got_reply)
goto drop;
/* If this test doesn't pass, it's not IP, or we should ignore it anyway */
if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
goto drop;
/* If it's not a RARP reply, delete it. */
if (rarp->ar_op != htons(ARPOP_RREPLY))
goto drop;
/* If it's not Ethernet, delete it. */
if (rarp->ar_pro != htons(ETH_P_IP))
goto drop;
/* Extract variable-width fields */
sha = rarp_ptr;
rarp_ptr += dev->addr_len;
memcpy(&sip, rarp_ptr, 4);
rarp_ptr += 4;
tha = rarp_ptr;
rarp_ptr += dev->addr_len;
memcpy(&tip, rarp_ptr, 4);
/* Discard packets which are not meant for us. */
if (memcmp(tha, dev->dev_addr, dev->addr_len))
goto drop;
/* Discard packets which are not from specified server. */
if (ic_servaddr != INADDR_NONE && ic_servaddr != sip)
goto drop;
/* Victory! The packet is what we were looking for! */
if (!ic_got_reply) {
ic_got_reply = IC_RARP;
ic_dev = dev;
if (ic_myaddr == INADDR_NONE)
ic_myaddr = tip;
ic_servaddr = sip;
}
/* And throw the packet out... */
drop:
kfree_skb(skb);
return 0;
}
/*
* Send RARP request packet over all devices which allow RARP.
*/
static void __init ic_rarp_send(void)
{
struct ic_device *d;
for (d=ic_first_dev; d; d=d->next)
if (d->able & IC_RARP) {
struct device *dev = d->dev;
arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
dev->dev_addr, dev->dev_addr);
}
}
#endif
/*
* BOOTP support.
*/
#ifdef CONFIG_IP_PNP_BOOTP
struct bootp_pkt { /* BOOTP packet format */
struct iphdr iph; /* IP header */
struct udphdr udph; /* UDP header */
u8 op; /* 1=request, 2=reply */
u8 htype; /* HW address type */
u8 hlen; /* HW address length */
u8 hops; /* Used only by gateways */
u32 xid; /* Transaction ID */
u16 secs; /* Seconds since we started */
u16 flags; /* Just what it says */
u32 client_ip; /* Client's IP address if known */
u32 your_ip; /* Assigned IP address */
u32 server_ip; /* Server's IP address */
u32 relay_ip; /* IP address of BOOTP relay */
u8 hw_addr[16]; /* Client's HW address */
u8 serv_name[64]; /* Server host name */
u8 boot_file[128]; /* Name of boot file */
u8 vendor_area[128]; /* Area for extensions */
};
#define BOOTP_REQUEST 1
#define BOOTP_REPLY 2
static u32 ic_bootp_xid;
static int ic_bootp_recv(struct sk_buff *skb, struct device *dev, struct packet_type *pt);
static struct packet_type bootp_packet_type __initdata = {
__constant_htons(ETH_P_IP),
NULL, /* Listen to all devices */
ic_bootp_recv,
NULL,
NULL
};
/*
* Initialize BOOTP extension fields in the request.
*/
static void __init ic_bootp_init_ext(u8 *e)
{
*e++ = 99; /* RFC1048 Magic Cookie */
*e++ = 130;
*e++ = 83;
*e++ = 99;
*e++ = 1; /* Subnet mask request */
*e++ = 4;
e += 4;
*e++ = 3; /* Default gateway request */
*e++ = 4;
e += 4;
*e++ = 12; /* Host name request */
*e++ = 32;
e += 32;
*e++ = 40; /* NIS Domain name request */
*e++ = 32;
e += 32;
*e++ = 17; /* Boot path */
*e++ = 32;
e += 32;
*e = 255; /* End of the list */
}
/*
* Initialize the BOOTP mechanism.
*/
static inline void ic_bootp_init(void)
{
get_random_bytes(&ic_bootp_xid, sizeof(u32));
DBG(("BOOTP: XID=%08x\n", ic_bootp_xid));
dev_add_pack(&bootp_packet_type);
}
/*
* BOOTP cleanup.
*/
static inline void ic_bootp_cleanup(void)
{
dev_remove_pack(&bootp_packet_type);
}
/*
* Send BOOTP request to single interface.
*/
static void __init ic_bootp_send_if(struct ic_device *d, u32 jiffies)
{
struct device *dev = d->dev;
struct sk_buff *skb;
struct bootp_pkt *b;
int hh_len = (dev->hard_header_len + 15) & ~15;
struct iphdr *h;
/* Allocate packet */
skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL);
if (!skb)
return;
skb_reserve(skb, hh_len);
b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
memset(b, 0, sizeof(struct bootp_pkt));
/* Construct IP header */
skb->nh.iph = h = &b->iph;
h->version = 4;
h->ihl = 5;
h->tot_len = htons(sizeof(struct bootp_pkt));
h->frag_off = htons(IP_DF);
h->ttl = 64;
h->protocol = IPPROTO_UDP;
h->daddr = INADDR_BROADCAST;
h->check = ip_fast_csum((unsigned char *) h, h->ihl);
/* Construct UDP header */
b->udph.source = htons(68);
b->udph.dest = htons(67);
b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
/* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
/* Construct BOOTP header */
b->op = BOOTP_REQUEST;
b->htype = dev->type;
b->hlen = dev->addr_len;
memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
b->secs = htons(jiffies / HZ);
b->xid = ic_bootp_xid;
ic_bootp_init_ext(b->vendor_area);
/* Chain packet down the line... */
skb->dev = dev;
skb->protocol = __constant_htons(ETH_P_IP);
if ((dev->hard_header &&
dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) ||
dev_queue_xmit(skb) < 0)
printk("E");
}
/*
* Send BOOTP requests to all interfaces.
*/
static void __init ic_bootp_send(u32 jiffies)
{
struct ic_device *d;
for(d=ic_first_dev; d; d=d->next)
if (d->able & IC_BOOTP)
ic_bootp_send_if(d, jiffies);
}
/*
* Copy BOOTP-supplied string if not already set.
*/
static int __init ic_bootp_string(char *dest, char *src, int len, int max)
{
if (!len)
return 0;
if (len > max-1)
len = max-1;
strncpy(dest, src, len);
dest[len] = '\0';
return 1;
}
/*
* Process BOOTP extension.
*/
static void __init ic_do_bootp_ext(u8 *ext)
{
#ifdef IPCONFIG_DEBUG
u8 *c;
printk("BOOTP: Got extension %02x",*ext);
for(c=ext+2; c<ext+2+ext[1]; c++)
printk(" %02x", *c);
printk("\n");
#endif
switch (*ext++) {
case 1: /* Subnet mask */
if (ic_netmask == INADDR_NONE)
memcpy(&ic_netmask, ext+1, 4);
break;
case 3: /* Default gateway */
if (ic_gateway == INADDR_NONE)
memcpy(&ic_gateway, ext+1, 4);
break;
case 12: /* Host name */
ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN);
ic_host_name_set = 1;
break;
case 40: /* NIS Domain name */
ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN);
break;
case 17: /* Root path */
if (!root_server_path[0])
ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
break;
}
}
/*
* Receive BOOTP reply.
*/
static int __init ic_bootp_recv(struct sk_buff *skb, struct device *dev, struct packet_type *pt)
{
struct bootp_pkt *b = (struct bootp_pkt *) skb->nh.iph;
struct iphdr *h = &b->iph;
int len;
/* If we already have a reply, just drop the packet */
if (ic_got_reply)
goto drop;
/* Check whether it's a BOOTP packet */
if (skb->pkt_type == PACKET_OTHERHOST ||
skb->len < sizeof(struct udphdr) + sizeof(struct iphdr) ||
h->ihl != 5 ||
h->version != 4 ||
ip_fast_csum((char *) h, h->ihl) != 0 ||
skb->len < ntohs(h->tot_len) ||
h->protocol != IPPROTO_UDP ||
b->udph.source != htons(67) ||
b->udph.dest != htons(68) ||
ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
goto drop;
/* Fragments are not supported */
if (h->frag_off & htons(IP_OFFSET|IP_MF)) {
printk(KERN_ERR "BOOTP: Ignoring fragmented reply.\n");
goto drop;
}
/* Is it a reply to our BOOTP request? */
len = ntohs(b->udph.len) - sizeof(struct udphdr);
if (len < 300 || /* See RFC 951:2.1 */
b->op != BOOTP_REPLY ||
b->xid != ic_bootp_xid) {
printk("?");
goto drop;
}
/* Extract basic fields */
ic_myaddr = b->your_ip;
ic_servaddr = b->server_ip;
ic_got_reply = IC_BOOTP;
ic_dev = dev;
/* Parse extensions */
if (b->vendor_area[0] == 99 && /* Check magic cookie */
b->vendor_area[1] == 130 &&
b->vendor_area[2] == 83 &&
b->vendor_area[3] == 99) {
u8 *ext = &b->vendor_area[4];
u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
while (ext < end && *ext != 0xff) {
if (*ext == 0) /* Padding */
ext++;
else {
u8 *opt = ext;
ext += ext[1] + 2;
if (ext <= end)
ic_do_bootp_ext(opt);
}
}
}
if (ic_gateway == INADDR_NONE && b->relay_ip)
ic_gateway = b->relay_ip;
drop:
kfree_skb(skb);
return 0;
}
#endif
/*
* Dynamic IP configuration -- BOOTP and RARP.
*/
#ifdef CONFIG_IP_PNP_DYNAMIC
static int __init ic_dynamic(void)
{
int retries;
unsigned long timeout, jiff;
unsigned long start_jiffies;
int do_rarp = ic_proto_have_if & IC_RARP;
int do_bootp = ic_proto_have_if & IC_BOOTP;
/*
* If neither BOOTP nor RARP was selected, return with an error. This
* routine gets only called when some pieces of information are mis-
* sing, and without BOOTP and RARP we are not able to get that in-
* formation.
*/
if (!ic_proto_enabled) {
printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
return -1;
}
#ifdef CONFIG_IP_PNP_BOOTP
if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
printk(KERN_ERR "BOOTP: No suitable device found.\n");
#endif
#ifdef CONFIG_IP_PNP_RARP
if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
printk(KERN_ERR "RARP: No suitable device found.\n");
#endif
if (!ic_proto_have_if)
/* Error message already printed */
return -1;
/*
* Setup RARP and BOOTP protocols
*/
#ifdef CONFIG_IP_PNP_RARP
if (do_rarp)
ic_rarp_init();
#endif
#ifdef CONFIG_IP_PNP_BOOTP
if (do_bootp)
ic_bootp_init();
#endif
/*
* Send requests and wait, until we get an answer. This loop
* seems to be a terrible waste of CPU time, but actually there is
* only one process running at all, so we don't need to use any
* scheduler functions.
* [Actually we could now, but the nothing else running note still
* applies.. - AC]
*/
printk(KERN_NOTICE "Sending %s%s%s requests...",
do_bootp ? "BOOTP" : "",
do_bootp && do_rarp ? " and " : "",
do_rarp ? "RARP" : "");
start_jiffies = jiffies;
retries = CONF_RETRIES;
get_random_bytes(&timeout, sizeof(timeout));
timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
for(;;) {
#ifdef CONFIG_IP_PNP_BOOTP
if (do_bootp)
ic_bootp_send(jiffies - start_jiffies);
#endif
#ifdef CONFIG_IP_PNP_RARP
if (do_rarp)
ic_rarp_send();
#endif
printk(".");
jiff = jiffies + timeout;
while (jiffies < jiff && !ic_got_reply)
;
if (ic_got_reply) {
printk(" OK\n");
break;
}
if (! --retries) {
printk(" timed out!\n");
break;
}
timeout = timeout CONF_TIMEOUT_MULT;
if (timeout > CONF_TIMEOUT_MAX)
timeout = CONF_TIMEOUT_MAX;
}
#ifdef CONFIG_IP_PNP_RARP
if (do_rarp)
ic_rarp_cleanup();
#endif
#ifdef CONFIG_IP_PNP_BOOTP
if (do_bootp)
ic_bootp_cleanup();
#endif
if (!ic_got_reply)
return -1;
printk("IP-Config: Got %s answer from %s, ",
(ic_got_reply & IC_BOOTP) ? "BOOTP" : "RARP",
in_ntoa(ic_servaddr));
printk("my address is %s\n", in_ntoa(ic_myaddr));
return 0;
}
#endif
/*
* IP Autoconfig dispatcher.
*/
int __init ip_auto_config(void)
{
if (!ic_enable)
return 0;
DBG(("IP-Config: Entered.\n"));
/* Setup all network devices */
if (ic_open_devs() < 0)
return -1;
/*
* If the config information is insufficient (e.g., our IP address or
* IP address of the boot server is missing or we have multiple network
* interfaces and no default was set), use BOOTP or RARP to get the
* missing values.
*/
if (ic_myaddr == INADDR_NONE ||
#ifdef CONFIG_ROOT_NFS
(root_server_addr == INADDR_NONE && ic_servaddr == INADDR_NONE) ||
#endif
ic_first_dev->next) {
#ifdef CONFIG_IP_PNP_DYNAMIC
if (ic_dynamic() < 0) {
printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
ic_close_devs();
return -1;
}
#else
printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
ic_close_devs();
return -1;
#endif
} else {
ic_dev = ic_first_dev->dev; /* Device selected manually or only one device -> use it */
}
/*
* Use defaults whereever applicable.
*/
if (ic_defaults() < 0)
return -1;
/*
* Close all network devices except the device we've
* autoconfigured and set up routes.
*/
ic_close_devs();
if (ic_setup_if() < 0 || ic_setup_routes() < 0)
return -1;
DBG(("IP-Config: device=%s, local=%08x, server=%08x, boot=%08x, gw=%08x, mask=%08x\n",
ic_dev->name, ic_myaddr, ic_servaddr, root_server_addr, ic_gateway, ic_netmask));
DBG(("IP-Config: host=%s, domain=%s, path=`%s'\n", system_utsname.nodename,
system_utsname.domainname, root_server_path));
return 0;
}
/*
* Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
* command line parameter. It consists of option fields separated by colons in
* the following order:
*
* <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<bootp|rarp>
*
* Any of the fields can be empty which means to use a default value:
* <client-ip> - address given by BOOTP or RARP
* <server-ip> - address of host returning BOOTP or RARP packet
* <gw-ip> - none, or the address returned by BOOTP
* <netmask> - automatically determined from <client-ip>, or the
* one returned by BOOTP
* <host name> - <client-ip> in ASCII notation, or the name returned
* by BOOTP
* <device> - use all available devices
* <bootp|rarp|both|off> - use both protocols to determine my own address
*/
static int __init ic_proto_name(char *name)
{
if (!strcmp(name, "off")) {
ic_proto_enabled = 0;
return 1;
}
#ifdef CONFIG_IP_PNP_BOOTP
else if (!strcmp(name, "bootp")) {
ic_proto_enabled &= ~IC_RARP;
return 1;
}
#endif
#ifdef CONFIG_IP_PNP_RARP
else if (!strcmp(name, "rarp")) {
ic_proto_enabled &= ~IC_BOOTP;
return 1;
}
#endif
#ifdef CONFIG_IP_PNP_DYNAMIC
else if (!strcmp(name, "both")) {
return 1;
}
#endif
return 0;
}
void __init ip_auto_config_setup(char *addrs, int *ints)
{
char *cp, *ip, *dp;
int num = 0;
ic_set_manually = 1;
if (!strcmp(addrs, "off")) {
ic_enable = 0;
return;
}
if (ic_proto_name(addrs))
return;
/* Parse the whole string */
ip = addrs;
while (ip && *ip) {
if ((cp = strchr(ip, ':')))
*cp++ = '\0';
if (strlen(ip) > 0) {
DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip));
switch (num) {
case 0:
if ((ic_myaddr = in_aton(ip)) == INADDR_ANY)
ic_myaddr = INADDR_NONE;
break;
case 1:
if ((ic_servaddr = in_aton(ip)) == INADDR_ANY)
ic_servaddr = INADDR_NONE;
break;
case 2:
if ((ic_gateway = in_aton(ip)) == INADDR_ANY)
ic_gateway = INADDR_NONE;
break;
case 3:
if ((ic_netmask = in_aton(ip)) == INADDR_ANY)
ic_netmask = INADDR_NONE;
break;
case 4:
if ((dp = strchr(ip, '.'))) {
*dp++ = '\0';
strncpy(system_utsname.domainname, dp, __NEW_UTS_LEN);
system_utsname.domainname[__NEW_UTS_LEN] = '\0';
}
strncpy(system_utsname.nodename, ip, __NEW_UTS_LEN);
system_utsname.nodename[__NEW_UTS_LEN] = '\0';
ic_host_name_set = 1;
break;
case 5:
strncpy(user_dev_name, ip, IFNAMSIZ);
user_dev_name[IFNAMSIZ-1] = '\0';
break;
case 6:
ic_proto_name(ip);
break;
}
}
ip = cp;
num++;
}
}
|