Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * $Id: ipconfig.c,v 1.46 2002/02/01 22:01:04 davem Exp $ |
| 3 | * |
| 4 | * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or |
| 5 | * user-supplied information to configure own IP address and routes. |
| 6 | * |
| 7 | * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz> |
| 8 | * |
| 9 | * Derived from network configuration code in fs/nfs/nfsroot.c, |
| 10 | * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me. |
| 11 | * |
| 12 | * BOOTP rewritten to construct and analyse packets itself instead |
| 13 | * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--; |
| 14 | * -- MJ, December 1998 |
| 15 | * |
| 16 | * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic" |
| 17 | * initialization scheme. |
| 18 | * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999 |
| 19 | * |
| 20 | * DHCP support added. To users this looks like a whole separate |
| 21 | * protocol, but we know it's just a bag on the side of BOOTP. |
| 22 | * -- Chip Salzenberg <chip@valinux.com>, May 2000 |
| 23 | * |
| 24 | * Ported DHCP support from 2.2.16 to 2.4.0-test4 |
| 25 | * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000 |
| 26 | * |
| 27 | * Merged changes from 2.2.19 into 2.4.3 |
| 28 | * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001 |
| 29 | * |
| 30 | * Multiple Nameservers in /proc/net/pnp |
| 31 | * -- Josef Siemes <jsiemes@web.de>, Aug 2002 |
| 32 | */ |
| 33 | |
| 34 | #include <linux/config.h> |
| 35 | #include <linux/types.h> |
| 36 | #include <linux/string.h> |
| 37 | #include <linux/kernel.h> |
| 38 | #include <linux/jiffies.h> |
| 39 | #include <linux/random.h> |
| 40 | #include <linux/init.h> |
| 41 | #include <linux/utsname.h> |
| 42 | #include <linux/in.h> |
| 43 | #include <linux/if.h> |
| 44 | #include <linux/inet.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 45 | #include <linux/inetdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include <linux/netdevice.h> |
| 47 | #include <linux/if_arp.h> |
| 48 | #include <linux/skbuff.h> |
| 49 | #include <linux/ip.h> |
| 50 | #include <linux/socket.h> |
| 51 | #include <linux/route.h> |
| 52 | #include <linux/udp.h> |
| 53 | #include <linux/proc_fs.h> |
| 54 | #include <linux/seq_file.h> |
| 55 | #include <linux/major.h> |
| 56 | #include <linux/root_dev.h> |
| 57 | #include <linux/delay.h> |
Adrian Bunk | 43d6066 | 2005-09-05 18:05:52 -0700 | [diff] [blame] | 58 | #include <linux/nfs_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | #include <net/arp.h> |
| 60 | #include <net/ip.h> |
| 61 | #include <net/ipconfig.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 62 | #include <net/route.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
| 64 | #include <asm/uaccess.h> |
| 65 | #include <net/checksum.h> |
| 66 | #include <asm/processor.h> |
| 67 | |
| 68 | /* Define this to allow debugging output */ |
| 69 | #undef IPCONFIG_DEBUG |
| 70 | |
| 71 | #ifdef IPCONFIG_DEBUG |
| 72 | #define DBG(x) printk x |
| 73 | #else |
| 74 | #define DBG(x) do { } while(0) |
| 75 | #endif |
| 76 | |
| 77 | #if defined(CONFIG_IP_PNP_DHCP) |
| 78 | #define IPCONFIG_DHCP |
| 79 | #endif |
| 80 | #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) |
| 81 | #define IPCONFIG_BOOTP |
| 82 | #endif |
| 83 | #if defined(CONFIG_IP_PNP_RARP) |
| 84 | #define IPCONFIG_RARP |
| 85 | #endif |
| 86 | #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) |
| 87 | #define IPCONFIG_DYNAMIC |
| 88 | #endif |
| 89 | |
| 90 | /* Define the friendly delay before and after opening net devices */ |
| 91 | #define CONF_PRE_OPEN 500 /* Before opening: 1/2 second */ |
| 92 | #define CONF_POST_OPEN 1 /* After opening: 1 second */ |
| 93 | |
| 94 | /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ |
| 95 | #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ |
| 96 | #define CONF_SEND_RETRIES 6 /* Send six requests per open */ |
| 97 | #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */ |
| 98 | #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ |
| 99 | #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ |
| 100 | #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ |
| 101 | #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ |
| 102 | #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers |
| 103 | - '3' from resolv.h */ |
| 104 | |
| 105 | |
| 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 | u32 ic_myaddr = INADDR_NONE; /* My IP address */ |
| 134 | static u32 ic_netmask = INADDR_NONE; /* Netmask for local subnet */ |
| 135 | u32 ic_gateway = INADDR_NONE; /* Gateway IP address */ |
| 136 | |
| 137 | u32 ic_servaddr = INADDR_NONE; /* Boot server IP address */ |
| 138 | |
| 139 | u32 root_server_addr = INADDR_NONE; /* Address of NFS server */ |
| 140 | u8 root_server_path[256] = { 0, }; /* Path to mount as root */ |
| 141 | |
| 142 | /* Persistent data: */ |
| 143 | |
| 144 | static int ic_proto_used; /* Protocol used, if any */ |
| 145 | static u32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ |
| 146 | static u8 ic_domain[64]; /* DNS (not NIS) domain name */ |
| 147 | |
| 148 | /* |
| 149 | * Private state. |
| 150 | */ |
| 151 | |
| 152 | /* Name of user-selected boot device */ |
| 153 | static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; |
| 154 | |
| 155 | /* Protocols supported by available interfaces */ |
| 156 | static int ic_proto_have_if __initdata = 0; |
| 157 | |
| 158 | #ifdef IPCONFIG_DYNAMIC |
| 159 | static DEFINE_SPINLOCK(ic_recv_lock); |
| 160 | static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */ |
| 161 | #endif |
| 162 | #ifdef IPCONFIG_DHCP |
| 163 | static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */ |
| 164 | #endif |
| 165 | |
| 166 | |
| 167 | /* |
| 168 | * Network devices |
| 169 | */ |
| 170 | |
| 171 | struct ic_device { |
| 172 | struct ic_device *next; |
| 173 | struct net_device *dev; |
| 174 | unsigned short flags; |
| 175 | short able; |
| 176 | u32 xid; |
| 177 | }; |
| 178 | |
| 179 | static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */ |
| 180 | static struct net_device *ic_dev __initdata = NULL; /* Selected device */ |
| 181 | |
| 182 | static int __init ic_open_devs(void) |
| 183 | { |
| 184 | struct ic_device *d, **last; |
| 185 | struct net_device *dev; |
| 186 | unsigned short oflags; |
| 187 | |
| 188 | last = &ic_first_dev; |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 189 | rtnl_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | |
| 191 | /* bring loopback device up first */ |
| 192 | if (dev_change_flags(&loopback_dev, loopback_dev.flags | IFF_UP) < 0) |
| 193 | printk(KERN_ERR "IP-Config: Failed to open %s\n", loopback_dev.name); |
| 194 | |
| 195 | for (dev = dev_base; dev; dev = dev->next) { |
| 196 | if (dev == &loopback_dev) |
| 197 | continue; |
| 198 | if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : |
| 199 | (!(dev->flags & IFF_LOOPBACK) && |
| 200 | (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && |
| 201 | strncmp(dev->name, "dummy", 5))) { |
| 202 | int able = 0; |
| 203 | if (dev->mtu >= 364) |
| 204 | able |= IC_BOOTP; |
| 205 | else |
| 206 | printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu); |
| 207 | if (!(dev->flags & IFF_NOARP)) |
| 208 | able |= IC_RARP; |
| 209 | able &= ic_proto_enabled; |
| 210 | if (ic_proto_enabled && !able) |
| 211 | continue; |
| 212 | oflags = dev->flags; |
| 213 | if (dev_change_flags(dev, oflags | IFF_UP) < 0) { |
| 214 | printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); |
| 215 | continue; |
| 216 | } |
| 217 | if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 218 | rtnl_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | return -1; |
| 220 | } |
| 221 | d->dev = dev; |
| 222 | *last = d; |
| 223 | last = &d->next; |
| 224 | d->flags = oflags; |
| 225 | d->able = able; |
| 226 | if (able & IC_BOOTP) |
| 227 | get_random_bytes(&d->xid, sizeof(u32)); |
| 228 | else |
| 229 | d->xid = 0; |
| 230 | ic_proto_have_if |= able; |
| 231 | DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", |
| 232 | dev->name, able, d->xid)); |
| 233 | } |
| 234 | } |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 235 | rtnl_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | |
| 237 | *last = NULL; |
| 238 | |
| 239 | if (!ic_first_dev) { |
| 240 | if (user_dev_name[0]) |
| 241 | printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name); |
| 242 | else |
| 243 | printk(KERN_ERR "IP-Config: No network devices available.\n"); |
| 244 | return -1; |
| 245 | } |
| 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | static void __init ic_close_devs(void) |
| 250 | { |
| 251 | struct ic_device *d, *next; |
| 252 | struct net_device *dev; |
| 253 | |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 254 | rtnl_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | next = ic_first_dev; |
| 256 | while ((d = next)) { |
| 257 | next = d->next; |
| 258 | dev = d->dev; |
| 259 | if (dev != ic_dev) { |
| 260 | DBG(("IP-Config: Downing %s\n", dev->name)); |
| 261 | dev_change_flags(dev, d->flags); |
| 262 | } |
| 263 | kfree(d); |
| 264 | } |
Stephen Hemminger | 6756ae4 | 2006-03-20 22:23:58 -0800 | [diff] [blame] | 265 | rtnl_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | } |
| 267 | |
| 268 | /* |
| 269 | * Interface to various network functions. |
| 270 | */ |
| 271 | |
| 272 | static inline void |
| 273 | set_sockaddr(struct sockaddr_in *sin, u32 addr, u16 port) |
| 274 | { |
| 275 | sin->sin_family = AF_INET; |
| 276 | sin->sin_addr.s_addr = addr; |
| 277 | sin->sin_port = port; |
| 278 | } |
| 279 | |
| 280 | static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) |
| 281 | { |
| 282 | int res; |
| 283 | |
| 284 | mm_segment_t oldfs = get_fs(); |
| 285 | set_fs(get_ds()); |
| 286 | res = devinet_ioctl(cmd, (struct ifreq __user *) arg); |
| 287 | set_fs(oldfs); |
| 288 | return res; |
| 289 | } |
| 290 | |
| 291 | static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) |
| 292 | { |
| 293 | int res; |
| 294 | |
| 295 | mm_segment_t oldfs = get_fs(); |
| 296 | set_fs(get_ds()); |
| 297 | res = ip_rt_ioctl(cmd, (void __user *) arg); |
| 298 | set_fs(oldfs); |
| 299 | return res; |
| 300 | } |
| 301 | |
| 302 | /* |
| 303 | * Set up interface addresses and routes. |
| 304 | */ |
| 305 | |
| 306 | static int __init ic_setup_if(void) |
| 307 | { |
| 308 | struct ifreq ir; |
| 309 | struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; |
| 310 | int err; |
| 311 | |
| 312 | memset(&ir, 0, sizeof(ir)); |
| 313 | strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); |
| 314 | set_sockaddr(sin, ic_myaddr, 0); |
| 315 | if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) { |
| 316 | printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err); |
| 317 | return -1; |
| 318 | } |
| 319 | set_sockaddr(sin, ic_netmask, 0); |
| 320 | if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) { |
| 321 | printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err); |
| 322 | return -1; |
| 323 | } |
| 324 | set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); |
| 325 | if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { |
| 326 | printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err); |
| 327 | return -1; |
| 328 | } |
| 329 | return 0; |
| 330 | } |
| 331 | |
| 332 | static int __init ic_setup_routes(void) |
| 333 | { |
| 334 | /* No need to setup device routes, only the default route... */ |
| 335 | |
| 336 | if (ic_gateway != INADDR_NONE) { |
| 337 | struct rtentry rm; |
| 338 | int err; |
| 339 | |
| 340 | memset(&rm, 0, sizeof(rm)); |
| 341 | if ((ic_gateway ^ ic_myaddr) & ic_netmask) { |
| 342 | printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n"); |
| 343 | return -1; |
| 344 | } |
| 345 | set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); |
| 346 | set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); |
| 347 | set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); |
| 348 | rm.rt_flags = RTF_UP | RTF_GATEWAY; |
| 349 | if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { |
| 350 | printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err); |
| 351 | return -1; |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | return 0; |
| 356 | } |
| 357 | |
| 358 | /* |
| 359 | * Fill in default values for all missing parameters. |
| 360 | */ |
| 361 | |
| 362 | static int __init ic_defaults(void) |
| 363 | { |
| 364 | /* |
| 365 | * At this point we have no userspace running so need not |
| 366 | * claim locks on system_utsname |
| 367 | */ |
| 368 | |
| 369 | if (!ic_host_name_set) |
| 370 | sprintf(system_utsname.nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr)); |
| 371 | |
| 372 | if (root_server_addr == INADDR_NONE) |
| 373 | root_server_addr = ic_servaddr; |
| 374 | |
| 375 | if (ic_netmask == INADDR_NONE) { |
| 376 | if (IN_CLASSA(ntohl(ic_myaddr))) |
| 377 | ic_netmask = htonl(IN_CLASSA_NET); |
| 378 | else if (IN_CLASSB(ntohl(ic_myaddr))) |
| 379 | ic_netmask = htonl(IN_CLASSB_NET); |
| 380 | else if (IN_CLASSC(ntohl(ic_myaddr))) |
| 381 | ic_netmask = htonl(IN_CLASSC_NET); |
| 382 | else { |
| 383 | printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n", |
| 384 | NIPQUAD(ic_myaddr)); |
| 385 | return -1; |
| 386 | } |
| 387 | printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask)); |
| 388 | } |
| 389 | |
| 390 | return 0; |
| 391 | } |
| 392 | |
| 393 | /* |
| 394 | * RARP support. |
| 395 | */ |
| 396 | |
| 397 | #ifdef IPCONFIG_RARP |
| 398 | |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 399 | static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | |
| 401 | static struct packet_type rarp_packet_type __initdata = { |
| 402 | .type = __constant_htons(ETH_P_RARP), |
| 403 | .func = ic_rarp_recv, |
| 404 | }; |
| 405 | |
| 406 | static inline void ic_rarp_init(void) |
| 407 | { |
| 408 | dev_add_pack(&rarp_packet_type); |
| 409 | } |
| 410 | |
| 411 | static inline void ic_rarp_cleanup(void) |
| 412 | { |
| 413 | dev_remove_pack(&rarp_packet_type); |
| 414 | } |
| 415 | |
| 416 | /* |
| 417 | * Process received RARP packet. |
| 418 | */ |
| 419 | static int __init |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 420 | ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | { |
| 422 | struct arphdr *rarp; |
| 423 | unsigned char *rarp_ptr; |
| 424 | unsigned long sip, tip; |
| 425 | unsigned char *sha, *tha; /* s for "source", t for "target" */ |
| 426 | struct ic_device *d; |
| 427 | |
| 428 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
| 429 | return NET_RX_DROP; |
| 430 | |
| 431 | if (!pskb_may_pull(skb, sizeof(struct arphdr))) |
| 432 | goto drop; |
| 433 | |
| 434 | /* Basic sanity checks can be done without the lock. */ |
| 435 | rarp = (struct arphdr *)skb->h.raw; |
| 436 | |
| 437 | /* If this test doesn't pass, it's not IP, or we should |
| 438 | * ignore it anyway. |
| 439 | */ |
| 440 | if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) |
| 441 | goto drop; |
| 442 | |
| 443 | /* If it's not a RARP reply, delete it. */ |
| 444 | if (rarp->ar_op != htons(ARPOP_RREPLY)) |
| 445 | goto drop; |
| 446 | |
| 447 | /* If it's not Ethernet, delete it. */ |
| 448 | if (rarp->ar_pro != htons(ETH_P_IP)) |
| 449 | goto drop; |
| 450 | |
| 451 | if (!pskb_may_pull(skb, |
| 452 | sizeof(struct arphdr) + |
| 453 | (2 * dev->addr_len) + |
| 454 | (2 * 4))) |
| 455 | goto drop; |
| 456 | |
| 457 | /* OK, it is all there and looks valid, process... */ |
| 458 | rarp = (struct arphdr *)skb->h.raw; |
| 459 | rarp_ptr = (unsigned char *) (rarp + 1); |
| 460 | |
| 461 | /* One reply at a time, please. */ |
| 462 | spin_lock(&ic_recv_lock); |
| 463 | |
| 464 | /* If we already have a reply, just drop the packet */ |
| 465 | if (ic_got_reply) |
| 466 | goto drop_unlock; |
| 467 | |
| 468 | /* Find the ic_device that the packet arrived on */ |
| 469 | d = ic_first_dev; |
| 470 | while (d && d->dev != dev) |
| 471 | d = d->next; |
| 472 | if (!d) |
| 473 | goto drop_unlock; /* should never happen */ |
| 474 | |
| 475 | /* Extract variable-width fields */ |
| 476 | sha = rarp_ptr; |
| 477 | rarp_ptr += dev->addr_len; |
| 478 | memcpy(&sip, rarp_ptr, 4); |
| 479 | rarp_ptr += 4; |
| 480 | tha = rarp_ptr; |
| 481 | rarp_ptr += dev->addr_len; |
| 482 | memcpy(&tip, rarp_ptr, 4); |
| 483 | |
| 484 | /* Discard packets which are not meant for us. */ |
| 485 | if (memcmp(tha, dev->dev_addr, dev->addr_len)) |
| 486 | goto drop_unlock; |
| 487 | |
| 488 | /* Discard packets which are not from specified server. */ |
| 489 | if (ic_servaddr != INADDR_NONE && ic_servaddr != sip) |
| 490 | goto drop_unlock; |
| 491 | |
| 492 | /* We have a winner! */ |
| 493 | ic_dev = dev; |
| 494 | if (ic_myaddr == INADDR_NONE) |
| 495 | ic_myaddr = tip; |
| 496 | ic_servaddr = sip; |
| 497 | ic_got_reply = IC_RARP; |
| 498 | |
| 499 | drop_unlock: |
| 500 | /* Show's over. Nothing to see here. */ |
| 501 | spin_unlock(&ic_recv_lock); |
| 502 | |
| 503 | drop: |
| 504 | /* Throw the packet out. */ |
| 505 | kfree_skb(skb); |
| 506 | return 0; |
| 507 | } |
| 508 | |
| 509 | |
| 510 | /* |
| 511 | * Send RARP request packet over a single interface. |
| 512 | */ |
| 513 | static void __init ic_rarp_send_if(struct ic_device *d) |
| 514 | { |
| 515 | struct net_device *dev = d->dev; |
| 516 | arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, |
| 517 | dev->dev_addr, dev->dev_addr); |
| 518 | } |
| 519 | #endif |
| 520 | |
| 521 | /* |
| 522 | * DHCP/BOOTP support. |
| 523 | */ |
| 524 | |
| 525 | #ifdef IPCONFIG_BOOTP |
| 526 | |
| 527 | struct bootp_pkt { /* BOOTP packet format */ |
| 528 | struct iphdr iph; /* IP header */ |
| 529 | struct udphdr udph; /* UDP header */ |
| 530 | u8 op; /* 1=request, 2=reply */ |
| 531 | u8 htype; /* HW address type */ |
| 532 | u8 hlen; /* HW address length */ |
| 533 | u8 hops; /* Used only by gateways */ |
| 534 | u32 xid; /* Transaction ID */ |
| 535 | u16 secs; /* Seconds since we started */ |
| 536 | u16 flags; /* Just what it says */ |
| 537 | u32 client_ip; /* Client's IP address if known */ |
| 538 | u32 your_ip; /* Assigned IP address */ |
| 539 | u32 server_ip; /* (Next, e.g. NFS) Server's IP address */ |
| 540 | u32 relay_ip; /* IP address of BOOTP relay */ |
| 541 | u8 hw_addr[16]; /* Client's HW address */ |
| 542 | u8 serv_name[64]; /* Server host name */ |
| 543 | u8 boot_file[128]; /* Name of boot file */ |
| 544 | u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ |
| 545 | }; |
| 546 | |
| 547 | /* packet ops */ |
| 548 | #define BOOTP_REQUEST 1 |
| 549 | #define BOOTP_REPLY 2 |
| 550 | |
| 551 | /* DHCP message types */ |
| 552 | #define DHCPDISCOVER 1 |
| 553 | #define DHCPOFFER 2 |
| 554 | #define DHCPREQUEST 3 |
| 555 | #define DHCPDECLINE 4 |
| 556 | #define DHCPACK 5 |
| 557 | #define DHCPNAK 6 |
| 558 | #define DHCPRELEASE 7 |
| 559 | #define DHCPINFORM 8 |
| 560 | |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 561 | static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | |
| 563 | static struct packet_type bootp_packet_type __initdata = { |
| 564 | .type = __constant_htons(ETH_P_IP), |
| 565 | .func = ic_bootp_recv, |
| 566 | }; |
| 567 | |
| 568 | |
| 569 | /* |
| 570 | * Initialize DHCP/BOOTP extension fields in the request. |
| 571 | */ |
| 572 | |
| 573 | static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; |
| 574 | |
| 575 | #ifdef IPCONFIG_DHCP |
| 576 | |
| 577 | static void __init |
| 578 | ic_dhcp_init_options(u8 *options) |
| 579 | { |
| 580 | u8 mt = ((ic_servaddr == INADDR_NONE) |
| 581 | ? DHCPDISCOVER : DHCPREQUEST); |
| 582 | u8 *e = options; |
| 583 | |
| 584 | #ifdef IPCONFIG_DEBUG |
| 585 | printk("DHCP: Sending message type %d\n", mt); |
| 586 | #endif |
| 587 | |
| 588 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ |
| 589 | e += 4; |
| 590 | |
| 591 | *e++ = 53; /* DHCP message type */ |
| 592 | *e++ = 1; |
| 593 | *e++ = mt; |
| 594 | |
| 595 | if (mt == DHCPREQUEST) { |
| 596 | *e++ = 54; /* Server ID (IP address) */ |
| 597 | *e++ = 4; |
| 598 | memcpy(e, &ic_servaddr, 4); |
| 599 | e += 4; |
| 600 | |
| 601 | *e++ = 50; /* Requested IP address */ |
| 602 | *e++ = 4; |
| 603 | memcpy(e, &ic_myaddr, 4); |
| 604 | e += 4; |
| 605 | } |
| 606 | |
| 607 | /* always? */ |
| 608 | { |
| 609 | static const u8 ic_req_params[] = { |
| 610 | 1, /* Subnet mask */ |
| 611 | 3, /* Default gateway */ |
| 612 | 6, /* DNS server */ |
| 613 | 12, /* Host name */ |
| 614 | 15, /* Domain name */ |
| 615 | 17, /* Boot path */ |
| 616 | 40, /* NIS domain name */ |
| 617 | }; |
| 618 | |
| 619 | *e++ = 55; /* Parameter request list */ |
| 620 | *e++ = sizeof(ic_req_params); |
| 621 | memcpy(e, ic_req_params, sizeof(ic_req_params)); |
| 622 | e += sizeof(ic_req_params); |
| 623 | } |
| 624 | |
| 625 | *e++ = 255; /* End of the list */ |
| 626 | } |
| 627 | |
| 628 | #endif /* IPCONFIG_DHCP */ |
| 629 | |
| 630 | static void __init ic_bootp_init_ext(u8 *e) |
| 631 | { |
| 632 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ |
| 633 | e += 4; |
| 634 | *e++ = 1; /* Subnet mask request */ |
| 635 | *e++ = 4; |
| 636 | e += 4; |
| 637 | *e++ = 3; /* Default gateway request */ |
| 638 | *e++ = 4; |
| 639 | e += 4; |
| 640 | *e++ = 5; /* Name server request */ |
| 641 | *e++ = 8; |
| 642 | e += 8; |
| 643 | *e++ = 12; /* Host name request */ |
| 644 | *e++ = 32; |
| 645 | e += 32; |
| 646 | *e++ = 40; /* NIS Domain name request */ |
| 647 | *e++ = 32; |
| 648 | e += 32; |
| 649 | *e++ = 17; /* Boot path */ |
| 650 | *e++ = 40; |
| 651 | e += 40; |
| 652 | |
| 653 | *e++ = 57; /* set extension buffer size for reply */ |
| 654 | *e++ = 2; |
| 655 | *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ |
| 656 | *e++ = 150; |
| 657 | |
| 658 | *e++ = 255; /* End of the list */ |
| 659 | } |
| 660 | |
| 661 | |
| 662 | /* |
| 663 | * Initialize the DHCP/BOOTP mechanism. |
| 664 | */ |
| 665 | static inline void ic_bootp_init(void) |
| 666 | { |
| 667 | int i; |
| 668 | |
| 669 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) |
| 670 | ic_nameservers[i] = INADDR_NONE; |
| 671 | |
| 672 | dev_add_pack(&bootp_packet_type); |
| 673 | } |
| 674 | |
| 675 | |
| 676 | /* |
| 677 | * DHCP/BOOTP cleanup. |
| 678 | */ |
| 679 | static inline void ic_bootp_cleanup(void) |
| 680 | { |
| 681 | dev_remove_pack(&bootp_packet_type); |
| 682 | } |
| 683 | |
| 684 | |
| 685 | /* |
| 686 | * Send DHCP/BOOTP request to single interface. |
| 687 | */ |
| 688 | static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) |
| 689 | { |
| 690 | struct net_device *dev = d->dev; |
| 691 | struct sk_buff *skb; |
| 692 | struct bootp_pkt *b; |
| 693 | int hh_len = LL_RESERVED_SPACE(dev); |
| 694 | struct iphdr *h; |
| 695 | |
| 696 | /* Allocate packet */ |
| 697 | skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL); |
| 698 | if (!skb) |
| 699 | return; |
| 700 | skb_reserve(skb, hh_len); |
| 701 | b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); |
| 702 | memset(b, 0, sizeof(struct bootp_pkt)); |
| 703 | |
| 704 | /* Construct IP header */ |
| 705 | skb->nh.iph = h = &b->iph; |
| 706 | h->version = 4; |
| 707 | h->ihl = 5; |
| 708 | h->tot_len = htons(sizeof(struct bootp_pkt)); |
| 709 | h->frag_off = htons(IP_DF); |
| 710 | h->ttl = 64; |
| 711 | h->protocol = IPPROTO_UDP; |
| 712 | h->daddr = INADDR_BROADCAST; |
| 713 | h->check = ip_fast_csum((unsigned char *) h, h->ihl); |
| 714 | |
| 715 | /* Construct UDP header */ |
| 716 | b->udph.source = htons(68); |
| 717 | b->udph.dest = htons(67); |
| 718 | b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); |
| 719 | /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ |
| 720 | |
| 721 | /* Construct DHCP/BOOTP header */ |
| 722 | b->op = BOOTP_REQUEST; |
| 723 | if (dev->type < 256) /* check for false types */ |
| 724 | b->htype = dev->type; |
| 725 | else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ |
| 726 | b->htype = ARPHRD_IEEE802; |
| 727 | else if (dev->type == ARPHRD_FDDI) |
| 728 | b->htype = ARPHRD_ETHER; |
| 729 | else { |
| 730 | printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); |
| 731 | b->htype = dev->type; /* can cause undefined behavior */ |
| 732 | } |
| 733 | b->hlen = dev->addr_len; |
| 734 | b->your_ip = INADDR_NONE; |
| 735 | b->server_ip = INADDR_NONE; |
| 736 | memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); |
| 737 | b->secs = htons(jiffies_diff / HZ); |
| 738 | b->xid = d->xid; |
| 739 | |
| 740 | /* add DHCP options or BOOTP extensions */ |
| 741 | #ifdef IPCONFIG_DHCP |
| 742 | if (ic_proto_enabled & IC_USE_DHCP) |
| 743 | ic_dhcp_init_options(b->exten); |
| 744 | else |
| 745 | #endif |
| 746 | ic_bootp_init_ext(b->exten); |
| 747 | |
| 748 | /* Chain packet down the line... */ |
| 749 | skb->dev = dev; |
| 750 | skb->protocol = htons(ETH_P_IP); |
| 751 | if ((dev->hard_header && |
| 752 | dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) || |
| 753 | dev_queue_xmit(skb) < 0) |
| 754 | printk("E"); |
| 755 | } |
| 756 | |
| 757 | |
| 758 | /* |
| 759 | * Copy BOOTP-supplied string if not already set. |
| 760 | */ |
| 761 | static int __init ic_bootp_string(char *dest, char *src, int len, int max) |
| 762 | { |
| 763 | if (!len) |
| 764 | return 0; |
| 765 | if (len > max-1) |
| 766 | len = max-1; |
| 767 | memcpy(dest, src, len); |
| 768 | dest[len] = '\0'; |
| 769 | return 1; |
| 770 | } |
| 771 | |
| 772 | |
| 773 | /* |
| 774 | * Process BOOTP extensions. |
| 775 | */ |
| 776 | static void __init ic_do_bootp_ext(u8 *ext) |
| 777 | { |
| 778 | u8 servers; |
| 779 | int i; |
| 780 | |
| 781 | #ifdef IPCONFIG_DEBUG |
| 782 | u8 *c; |
| 783 | |
| 784 | printk("DHCP/BOOTP: Got extension %d:",*ext); |
| 785 | for(c=ext+2; c<ext+2+ext[1]; c++) |
| 786 | printk(" %02x", *c); |
| 787 | printk("\n"); |
| 788 | #endif |
| 789 | |
| 790 | switch (*ext++) { |
| 791 | case 1: /* Subnet mask */ |
| 792 | if (ic_netmask == INADDR_NONE) |
| 793 | memcpy(&ic_netmask, ext+1, 4); |
| 794 | break; |
| 795 | case 3: /* Default gateway */ |
| 796 | if (ic_gateway == INADDR_NONE) |
| 797 | memcpy(&ic_gateway, ext+1, 4); |
| 798 | break; |
| 799 | case 6: /* DNS server */ |
| 800 | servers= *ext/4; |
| 801 | if (servers > CONF_NAMESERVERS_MAX) |
| 802 | servers = CONF_NAMESERVERS_MAX; |
| 803 | for (i = 0; i < servers; i++) { |
| 804 | if (ic_nameservers[i] == INADDR_NONE) |
| 805 | memcpy(&ic_nameservers[i], ext+1+4*i, 4); |
| 806 | } |
| 807 | break; |
| 808 | case 12: /* Host name */ |
| 809 | ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN); |
| 810 | ic_host_name_set = 1; |
| 811 | break; |
| 812 | case 15: /* Domain name (DNS) */ |
| 813 | ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); |
| 814 | break; |
| 815 | case 17: /* Root path */ |
| 816 | if (!root_server_path[0]) |
| 817 | ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path)); |
| 818 | break; |
| 819 | case 40: /* NIS Domain name (_not_ DNS) */ |
| 820 | ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN); |
| 821 | break; |
| 822 | } |
| 823 | } |
| 824 | |
| 825 | |
| 826 | /* |
| 827 | * Receive BOOTP reply. |
| 828 | */ |
David S. Miller | f2ccd8f | 2005-08-09 19:34:12 -0700 | [diff] [blame] | 829 | static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | { |
| 831 | struct bootp_pkt *b; |
| 832 | struct iphdr *h; |
| 833 | struct ic_device *d; |
| 834 | int len, ext_len; |
| 835 | |
| 836 | /* Perform verifications before taking the lock. */ |
| 837 | if (skb->pkt_type == PACKET_OTHERHOST) |
| 838 | goto drop; |
| 839 | |
| 840 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
| 841 | return NET_RX_DROP; |
| 842 | |
| 843 | if (!pskb_may_pull(skb, |
| 844 | sizeof(struct iphdr) + |
| 845 | sizeof(struct udphdr))) |
| 846 | goto drop; |
| 847 | |
| 848 | b = (struct bootp_pkt *) skb->nh.iph; |
| 849 | h = &b->iph; |
| 850 | |
| 851 | if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) |
| 852 | goto drop; |
| 853 | |
| 854 | /* Fragments are not supported */ |
| 855 | if (h->frag_off & htons(IP_OFFSET | IP_MF)) { |
| 856 | if (net_ratelimit()) |
| 857 | printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " |
| 858 | "reply.\n"); |
| 859 | goto drop; |
| 860 | } |
| 861 | |
| 862 | if (skb->len < ntohs(h->tot_len)) |
| 863 | goto drop; |
| 864 | |
| 865 | if (ip_fast_csum((char *) h, h->ihl)) |
| 866 | goto drop; |
| 867 | |
| 868 | if (b->udph.source != htons(67) || b->udph.dest != htons(68)) |
| 869 | goto drop; |
| 870 | |
| 871 | if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) |
| 872 | goto drop; |
| 873 | |
| 874 | len = ntohs(b->udph.len) - sizeof(struct udphdr); |
| 875 | ext_len = len - (sizeof(*b) - |
| 876 | sizeof(struct iphdr) - |
| 877 | sizeof(struct udphdr) - |
| 878 | sizeof(b->exten)); |
| 879 | if (ext_len < 0) |
| 880 | goto drop; |
| 881 | |
| 882 | /* Ok the front looks good, make sure we can get at the rest. */ |
| 883 | if (!pskb_may_pull(skb, skb->len)) |
| 884 | goto drop; |
| 885 | |
| 886 | b = (struct bootp_pkt *) skb->nh.iph; |
| 887 | h = &b->iph; |
| 888 | |
| 889 | /* One reply at a time, please. */ |
| 890 | spin_lock(&ic_recv_lock); |
| 891 | |
| 892 | /* If we already have a reply, just drop the packet */ |
| 893 | if (ic_got_reply) |
| 894 | goto drop_unlock; |
| 895 | |
| 896 | /* Find the ic_device that the packet arrived on */ |
| 897 | d = ic_first_dev; |
| 898 | while (d && d->dev != dev) |
| 899 | d = d->next; |
| 900 | if (!d) |
| 901 | goto drop_unlock; /* should never happen */ |
| 902 | |
| 903 | /* Is it a reply to our BOOTP request? */ |
| 904 | if (b->op != BOOTP_REPLY || |
| 905 | b->xid != d->xid) { |
| 906 | if (net_ratelimit()) |
| 907 | printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " |
| 908 | "op[%x] xid[%x]\n", |
| 909 | b->op, b->xid); |
| 910 | goto drop_unlock; |
| 911 | } |
| 912 | |
| 913 | /* Parse extensions */ |
| 914 | if (ext_len >= 4 && |
| 915 | !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ |
| 916 | u8 *end = (u8 *) b + ntohs(b->iph.tot_len); |
| 917 | u8 *ext; |
| 918 | |
| 919 | #ifdef IPCONFIG_DHCP |
| 920 | if (ic_proto_enabled & IC_USE_DHCP) { |
| 921 | u32 server_id = INADDR_NONE; |
| 922 | int mt = 0; |
| 923 | |
| 924 | ext = &b->exten[4]; |
| 925 | while (ext < end && *ext != 0xff) { |
| 926 | u8 *opt = ext++; |
| 927 | if (*opt == 0) /* Padding */ |
| 928 | continue; |
| 929 | ext += *ext + 1; |
| 930 | if (ext >= end) |
| 931 | break; |
| 932 | switch (*opt) { |
| 933 | case 53: /* Message type */ |
| 934 | if (opt[1]) |
| 935 | mt = opt[2]; |
| 936 | break; |
| 937 | case 54: /* Server ID (IP address) */ |
| 938 | if (opt[1] >= 4) |
| 939 | memcpy(&server_id, opt + 2, 4); |
| 940 | break; |
| 941 | }; |
| 942 | } |
| 943 | |
| 944 | #ifdef IPCONFIG_DEBUG |
| 945 | printk("DHCP: Got message type %d\n", mt); |
| 946 | #endif |
| 947 | |
| 948 | switch (mt) { |
| 949 | case DHCPOFFER: |
| 950 | /* While in the process of accepting one offer, |
| 951 | * ignore all others. |
| 952 | */ |
| 953 | if (ic_myaddr != INADDR_NONE) |
| 954 | goto drop_unlock; |
| 955 | |
| 956 | /* Let's accept that offer. */ |
| 957 | ic_myaddr = b->your_ip; |
| 958 | ic_servaddr = server_id; |
| 959 | #ifdef IPCONFIG_DEBUG |
| 960 | printk("DHCP: Offered address %u.%u.%u.%u", |
| 961 | NIPQUAD(ic_myaddr)); |
| 962 | printk(" by server %u.%u.%u.%u\n", |
| 963 | NIPQUAD(ic_servaddr)); |
| 964 | #endif |
| 965 | /* The DHCP indicated server address takes |
| 966 | * precedence over the bootp header one if |
| 967 | * they are different. |
| 968 | */ |
| 969 | if ((server_id != INADDR_NONE) && |
| 970 | (b->server_ip != server_id)) |
| 971 | b->server_ip = ic_servaddr; |
| 972 | break; |
| 973 | |
| 974 | case DHCPACK: |
| 975 | if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) |
| 976 | goto drop_unlock; |
| 977 | |
| 978 | /* Yeah! */ |
| 979 | break; |
| 980 | |
| 981 | default: |
| 982 | /* Urque. Forget it*/ |
| 983 | ic_myaddr = INADDR_NONE; |
| 984 | ic_servaddr = INADDR_NONE; |
| 985 | goto drop_unlock; |
| 986 | }; |
| 987 | |
| 988 | ic_dhcp_msgtype = mt; |
| 989 | |
| 990 | } |
| 991 | #endif /* IPCONFIG_DHCP */ |
| 992 | |
| 993 | ext = &b->exten[4]; |
| 994 | while (ext < end && *ext != 0xff) { |
| 995 | u8 *opt = ext++; |
| 996 | if (*opt == 0) /* Padding */ |
| 997 | continue; |
| 998 | ext += *ext + 1; |
| 999 | if (ext < end) |
| 1000 | ic_do_bootp_ext(opt); |
| 1001 | } |
| 1002 | } |
| 1003 | |
| 1004 | /* We have a winner! */ |
| 1005 | ic_dev = dev; |
| 1006 | ic_myaddr = b->your_ip; |
| 1007 | ic_servaddr = b->server_ip; |
| 1008 | if (ic_gateway == INADDR_NONE && b->relay_ip) |
| 1009 | ic_gateway = b->relay_ip; |
| 1010 | if (ic_nameservers[0] == INADDR_NONE) |
| 1011 | ic_nameservers[0] = ic_servaddr; |
| 1012 | ic_got_reply = IC_BOOTP; |
| 1013 | |
| 1014 | drop_unlock: |
| 1015 | /* Show's over. Nothing to see here. */ |
| 1016 | spin_unlock(&ic_recv_lock); |
| 1017 | |
| 1018 | drop: |
| 1019 | /* Throw the packet out. */ |
| 1020 | kfree_skb(skb); |
| 1021 | |
| 1022 | return 0; |
| 1023 | } |
| 1024 | |
| 1025 | |
| 1026 | #endif |
| 1027 | |
| 1028 | |
| 1029 | /* |
| 1030 | * Dynamic IP configuration -- DHCP, BOOTP, RARP. |
| 1031 | */ |
| 1032 | |
| 1033 | #ifdef IPCONFIG_DYNAMIC |
| 1034 | |
| 1035 | static int __init ic_dynamic(void) |
| 1036 | { |
| 1037 | int retries; |
| 1038 | struct ic_device *d; |
| 1039 | unsigned long start_jiffies, timeout, jiff; |
| 1040 | int do_bootp = ic_proto_have_if & IC_BOOTP; |
| 1041 | int do_rarp = ic_proto_have_if & IC_RARP; |
| 1042 | |
| 1043 | /* |
| 1044 | * If none of DHCP/BOOTP/RARP was selected, return with an error. |
| 1045 | * This routine gets only called when some pieces of information |
| 1046 | * are missing, and without DHCP/BOOTP/RARP we are unable to get it. |
| 1047 | */ |
| 1048 | if (!ic_proto_enabled) { |
| 1049 | printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); |
| 1050 | return -1; |
| 1051 | } |
| 1052 | |
| 1053 | #ifdef IPCONFIG_BOOTP |
| 1054 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) |
| 1055 | printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); |
| 1056 | #endif |
| 1057 | #ifdef IPCONFIG_RARP |
| 1058 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) |
| 1059 | printk(KERN_ERR "RARP: No suitable device found.\n"); |
| 1060 | #endif |
| 1061 | |
| 1062 | if (!ic_proto_have_if) |
| 1063 | /* Error message already printed */ |
| 1064 | return -1; |
| 1065 | |
| 1066 | /* |
| 1067 | * Setup protocols |
| 1068 | */ |
| 1069 | #ifdef IPCONFIG_BOOTP |
| 1070 | if (do_bootp) |
| 1071 | ic_bootp_init(); |
| 1072 | #endif |
| 1073 | #ifdef IPCONFIG_RARP |
| 1074 | if (do_rarp) |
| 1075 | ic_rarp_init(); |
| 1076 | #endif |
| 1077 | |
| 1078 | /* |
| 1079 | * Send requests and wait, until we get an answer. This loop |
| 1080 | * seems to be a terrible waste of CPU time, but actually there is |
| 1081 | * only one process running at all, so we don't need to use any |
| 1082 | * scheduler functions. |
| 1083 | * [Actually we could now, but the nothing else running note still |
| 1084 | * applies.. - AC] |
| 1085 | */ |
| 1086 | printk(KERN_NOTICE "Sending %s%s%s requests .", |
| 1087 | do_bootp |
| 1088 | ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", |
| 1089 | (do_bootp && do_rarp) ? " and " : "", |
| 1090 | do_rarp ? "RARP" : ""); |
| 1091 | |
| 1092 | start_jiffies = jiffies; |
| 1093 | d = ic_first_dev; |
| 1094 | retries = CONF_SEND_RETRIES; |
| 1095 | get_random_bytes(&timeout, sizeof(timeout)); |
| 1096 | timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); |
| 1097 | for(;;) { |
| 1098 | #ifdef IPCONFIG_BOOTP |
| 1099 | if (do_bootp && (d->able & IC_BOOTP)) |
| 1100 | ic_bootp_send_if(d, jiffies - start_jiffies); |
| 1101 | #endif |
| 1102 | #ifdef IPCONFIG_RARP |
| 1103 | if (do_rarp && (d->able & IC_RARP)) |
| 1104 | ic_rarp_send_if(d); |
| 1105 | #endif |
| 1106 | |
| 1107 | jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); |
Nishanth Aravamudan | 121caf5 | 2005-09-12 14:15:34 -0700 | [diff] [blame] | 1108 | while (time_before(jiffies, jiff) && !ic_got_reply) |
| 1109 | schedule_timeout_uninterruptible(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | #ifdef IPCONFIG_DHCP |
| 1111 | /* DHCP isn't done until we get a DHCPACK. */ |
| 1112 | if ((ic_got_reply & IC_BOOTP) |
| 1113 | && (ic_proto_enabled & IC_USE_DHCP) |
| 1114 | && ic_dhcp_msgtype != DHCPACK) |
| 1115 | { |
| 1116 | ic_got_reply = 0; |
| 1117 | printk(","); |
| 1118 | continue; |
| 1119 | } |
| 1120 | #endif /* IPCONFIG_DHCP */ |
| 1121 | |
| 1122 | if (ic_got_reply) { |
| 1123 | printk(" OK\n"); |
| 1124 | break; |
| 1125 | } |
| 1126 | |
| 1127 | if ((d = d->next)) |
| 1128 | continue; |
| 1129 | |
| 1130 | if (! --retries) { |
| 1131 | printk(" timed out!\n"); |
| 1132 | break; |
| 1133 | } |
| 1134 | |
| 1135 | d = ic_first_dev; |
| 1136 | |
| 1137 | timeout = timeout CONF_TIMEOUT_MULT; |
| 1138 | if (timeout > CONF_TIMEOUT_MAX) |
| 1139 | timeout = CONF_TIMEOUT_MAX; |
| 1140 | |
| 1141 | printk("."); |
| 1142 | } |
| 1143 | |
| 1144 | #ifdef IPCONFIG_BOOTP |
| 1145 | if (do_bootp) |
| 1146 | ic_bootp_cleanup(); |
| 1147 | #endif |
| 1148 | #ifdef IPCONFIG_RARP |
| 1149 | if (do_rarp) |
| 1150 | ic_rarp_cleanup(); |
| 1151 | #endif |
| 1152 | |
Maxime Bizon | 7a1af5d | 2005-06-28 13:21:12 -0700 | [diff] [blame] | 1153 | if (!ic_got_reply) { |
| 1154 | ic_myaddr = INADDR_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | return -1; |
Maxime Bizon | 7a1af5d | 2005-06-28 13:21:12 -0700 | [diff] [blame] | 1156 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | |
| 1158 | printk("IP-Config: Got %s answer from %u.%u.%u.%u, ", |
| 1159 | ((ic_got_reply & IC_RARP) ? "RARP" |
| 1160 | : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), |
| 1161 | NIPQUAD(ic_servaddr)); |
| 1162 | printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr)); |
| 1163 | |
| 1164 | return 0; |
| 1165 | } |
| 1166 | |
| 1167 | #endif /* IPCONFIG_DYNAMIC */ |
| 1168 | |
| 1169 | #ifdef CONFIG_PROC_FS |
| 1170 | |
| 1171 | static int pnp_seq_show(struct seq_file *seq, void *v) |
| 1172 | { |
| 1173 | int i; |
| 1174 | |
| 1175 | if (ic_proto_used & IC_PROTO) |
| 1176 | seq_printf(seq, "#PROTO: %s\n", |
| 1177 | (ic_proto_used & IC_RARP) ? "RARP" |
| 1178 | : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); |
| 1179 | else |
| 1180 | seq_puts(seq, "#MANUAL\n"); |
| 1181 | |
| 1182 | if (ic_domain[0]) |
| 1183 | seq_printf(seq, |
| 1184 | "domain %s\n", ic_domain); |
| 1185 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { |
| 1186 | if (ic_nameservers[i] != INADDR_NONE) |
| 1187 | seq_printf(seq, |
| 1188 | "nameserver %u.%u.%u.%u\n", |
| 1189 | NIPQUAD(ic_nameservers[i])); |
| 1190 | } |
| 1191 | if (ic_servaddr != INADDR_NONE) |
| 1192 | seq_printf(seq, |
| 1193 | "bootserver %u.%u.%u.%u\n", |
| 1194 | NIPQUAD(ic_servaddr)); |
| 1195 | return 0; |
| 1196 | } |
| 1197 | |
| 1198 | static int pnp_seq_open(struct inode *indoe, struct file *file) |
| 1199 | { |
| 1200 | return single_open(file, pnp_seq_show, NULL); |
| 1201 | } |
| 1202 | |
| 1203 | static struct file_operations pnp_seq_fops = { |
| 1204 | .owner = THIS_MODULE, |
| 1205 | .open = pnp_seq_open, |
| 1206 | .read = seq_read, |
| 1207 | .llseek = seq_lseek, |
| 1208 | .release = single_release, |
| 1209 | }; |
| 1210 | #endif /* CONFIG_PROC_FS */ |
| 1211 | |
| 1212 | /* |
| 1213 | * Extract IP address from the parameter string if needed. Note that we |
| 1214 | * need to have root_server_addr set _before_ IPConfig gets called as it |
| 1215 | * can override it. |
| 1216 | */ |
| 1217 | u32 __init root_nfs_parse_addr(char *name) |
| 1218 | { |
| 1219 | u32 addr; |
| 1220 | int octets = 0; |
| 1221 | char *cp, *cq; |
| 1222 | |
| 1223 | cp = cq = name; |
| 1224 | while (octets < 4) { |
| 1225 | while (*cp >= '0' && *cp <= '9') |
| 1226 | cp++; |
| 1227 | if (cp == cq || cp - cq > 3) |
| 1228 | break; |
| 1229 | if (*cp == '.' || octets == 3) |
| 1230 | octets++; |
| 1231 | if (octets < 4) |
| 1232 | cp++; |
| 1233 | cq = cp; |
| 1234 | } |
| 1235 | if (octets == 4 && (*cp == ':' || *cp == '\0')) { |
| 1236 | if (*cp == ':') |
| 1237 | *cp++ = '\0'; |
| 1238 | addr = in_aton(name); |
| 1239 | memmove(name, cp, strlen(cp) + 1); |
| 1240 | } else |
| 1241 | addr = INADDR_NONE; |
| 1242 | |
| 1243 | return addr; |
| 1244 | } |
| 1245 | |
| 1246 | /* |
| 1247 | * IP Autoconfig dispatcher. |
| 1248 | */ |
| 1249 | |
| 1250 | static int __init ip_auto_config(void) |
| 1251 | { |
| 1252 | u32 addr; |
| 1253 | |
| 1254 | #ifdef CONFIG_PROC_FS |
| 1255 | proc_net_fops_create("pnp", S_IRUGO, &pnp_seq_fops); |
| 1256 | #endif /* CONFIG_PROC_FS */ |
| 1257 | |
| 1258 | if (!ic_enable) |
| 1259 | return 0; |
| 1260 | |
| 1261 | DBG(("IP-Config: Entered.\n")); |
| 1262 | #ifdef IPCONFIG_DYNAMIC |
| 1263 | try_try_again: |
| 1264 | #endif |
| 1265 | /* Give hardware a chance to settle */ |
| 1266 | msleep(CONF_PRE_OPEN); |
| 1267 | |
| 1268 | /* Setup all network devices */ |
| 1269 | if (ic_open_devs() < 0) |
| 1270 | return -1; |
| 1271 | |
| 1272 | /* Give drivers a chance to settle */ |
| 1273 | ssleep(CONF_POST_OPEN); |
| 1274 | |
| 1275 | /* |
| 1276 | * If the config information is insufficient (e.g., our IP address or |
| 1277 | * IP address of the boot server is missing or we have multiple network |
| 1278 | * interfaces and no default was set), use BOOTP or RARP to get the |
| 1279 | * missing values. |
| 1280 | */ |
| 1281 | if (ic_myaddr == INADDR_NONE || |
| 1282 | #ifdef CONFIG_ROOT_NFS |
| 1283 | (MAJOR(ROOT_DEV) == UNNAMED_MAJOR |
| 1284 | && root_server_addr == INADDR_NONE |
| 1285 | && ic_servaddr == INADDR_NONE) || |
| 1286 | #endif |
| 1287 | ic_first_dev->next) { |
| 1288 | #ifdef IPCONFIG_DYNAMIC |
| 1289 | |
| 1290 | int retries = CONF_OPEN_RETRIES; |
| 1291 | |
| 1292 | if (ic_dynamic() < 0) { |
| 1293 | ic_close_devs(); |
| 1294 | |
| 1295 | /* |
| 1296 | * I don't know why, but sometimes the |
| 1297 | * eepro100 driver (at least) gets upset and |
| 1298 | * doesn't work the first time it's opened. |
| 1299 | * But then if you close it and reopen it, it |
| 1300 | * works just fine. So we need to try that at |
| 1301 | * least once before giving up. |
| 1302 | * |
| 1303 | * Also, if the root will be NFS-mounted, we |
| 1304 | * have nowhere to go if DHCP fails. So we |
| 1305 | * just have to keep trying forever. |
| 1306 | * |
| 1307 | * -- Chip |
| 1308 | */ |
| 1309 | #ifdef CONFIG_ROOT_NFS |
| 1310 | if (ROOT_DEV == Root_NFS) { |
| 1311 | printk(KERN_ERR |
| 1312 | "IP-Config: Retrying forever (NFS root)...\n"); |
| 1313 | goto try_try_again; |
| 1314 | } |
| 1315 | #endif |
| 1316 | |
| 1317 | if (--retries) { |
| 1318 | printk(KERN_ERR |
| 1319 | "IP-Config: Reopening network devices...\n"); |
| 1320 | goto try_try_again; |
| 1321 | } |
| 1322 | |
| 1323 | /* Oh, well. At least we tried. */ |
| 1324 | printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); |
| 1325 | return -1; |
| 1326 | } |
| 1327 | #else /* !DYNAMIC */ |
| 1328 | printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); |
| 1329 | ic_close_devs(); |
| 1330 | return -1; |
| 1331 | #endif /* IPCONFIG_DYNAMIC */ |
| 1332 | } else { |
| 1333 | /* Device selected manually or only one device -> use it */ |
| 1334 | ic_dev = ic_first_dev->dev; |
| 1335 | } |
| 1336 | |
| 1337 | addr = root_nfs_parse_addr(root_server_path); |
| 1338 | if (root_server_addr == INADDR_NONE) |
| 1339 | root_server_addr = addr; |
| 1340 | |
| 1341 | /* |
| 1342 | * Use defaults whereever applicable. |
| 1343 | */ |
| 1344 | if (ic_defaults() < 0) |
| 1345 | return -1; |
| 1346 | |
| 1347 | /* |
| 1348 | * Close all network devices except the device we've |
| 1349 | * autoconfigured and set up routes. |
| 1350 | */ |
| 1351 | ic_close_devs(); |
| 1352 | if (ic_setup_if() < 0 || ic_setup_routes() < 0) |
| 1353 | return -1; |
| 1354 | |
| 1355 | /* |
| 1356 | * Record which protocol was actually used. |
| 1357 | */ |
| 1358 | #ifdef IPCONFIG_DYNAMIC |
| 1359 | ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); |
| 1360 | #endif |
| 1361 | |
| 1362 | #ifndef IPCONFIG_SILENT |
| 1363 | /* |
| 1364 | * Clue in the operator. |
| 1365 | */ |
| 1366 | printk("IP-Config: Complete:"); |
| 1367 | printk("\n device=%s", ic_dev->name); |
| 1368 | printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr)); |
| 1369 | printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask)); |
| 1370 | printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway)); |
| 1371 | printk(",\n host=%s, domain=%s, nis-domain=%s", |
| 1372 | system_utsname.nodename, ic_domain, system_utsname.domainname); |
| 1373 | printk(",\n bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr)); |
| 1374 | printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr)); |
| 1375 | printk(", rootpath=%s", root_server_path); |
| 1376 | printk("\n"); |
| 1377 | #endif /* !SILENT */ |
| 1378 | |
| 1379 | return 0; |
| 1380 | } |
| 1381 | |
| 1382 | late_initcall(ip_auto_config); |
| 1383 | |
| 1384 | |
| 1385 | /* |
| 1386 | * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel |
| 1387 | * command line parameter. It consists of option fields separated by colons in |
| 1388 | * the following order: |
| 1389 | * |
| 1390 | * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO> |
| 1391 | * |
| 1392 | * Any of the fields can be empty which means to use a default value: |
| 1393 | * <client-ip> - address given by BOOTP or RARP |
| 1394 | * <server-ip> - address of host returning BOOTP or RARP packet |
| 1395 | * <gw-ip> - none, or the address returned by BOOTP |
| 1396 | * <netmask> - automatically determined from <client-ip>, or the |
| 1397 | * one returned by BOOTP |
| 1398 | * <host name> - <client-ip> in ASCII notation, or the name returned |
| 1399 | * by BOOTP |
| 1400 | * <device> - use all available devices |
| 1401 | * <PROTO>: |
| 1402 | * off|none - don't do autoconfig at all (DEFAULT) |
| 1403 | * on|any - use any configured protocol |
| 1404 | * dhcp|bootp|rarp - use only the specified protocol |
| 1405 | * both - use both BOOTP and RARP (not DHCP) |
| 1406 | */ |
| 1407 | static int __init ic_proto_name(char *name) |
| 1408 | { |
| 1409 | if (!strcmp(name, "on") || !strcmp(name, "any")) { |
| 1410 | return 1; |
| 1411 | } |
| 1412 | #ifdef CONFIG_IP_PNP_DHCP |
| 1413 | else if (!strcmp(name, "dhcp")) { |
| 1414 | ic_proto_enabled &= ~IC_RARP; |
| 1415 | return 1; |
| 1416 | } |
| 1417 | #endif |
| 1418 | #ifdef CONFIG_IP_PNP_BOOTP |
| 1419 | else if (!strcmp(name, "bootp")) { |
| 1420 | ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); |
| 1421 | return 1; |
| 1422 | } |
| 1423 | #endif |
| 1424 | #ifdef CONFIG_IP_PNP_RARP |
| 1425 | else if (!strcmp(name, "rarp")) { |
| 1426 | ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); |
| 1427 | return 1; |
| 1428 | } |
| 1429 | #endif |
| 1430 | #ifdef IPCONFIG_DYNAMIC |
| 1431 | else if (!strcmp(name, "both")) { |
| 1432 | ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ |
| 1433 | return 1; |
| 1434 | } |
| 1435 | #endif |
| 1436 | return 0; |
| 1437 | } |
| 1438 | |
| 1439 | static int __init ip_auto_config_setup(char *addrs) |
| 1440 | { |
| 1441 | char *cp, *ip, *dp; |
| 1442 | int num = 0; |
| 1443 | |
| 1444 | ic_set_manually = 1; |
| 1445 | |
| 1446 | ic_enable = (*addrs && |
| 1447 | (strcmp(addrs, "off") != 0) && |
| 1448 | (strcmp(addrs, "none") != 0)); |
| 1449 | if (!ic_enable) |
| 1450 | return 1; |
| 1451 | |
| 1452 | if (ic_proto_name(addrs)) |
| 1453 | return 1; |
| 1454 | |
| 1455 | /* Parse the whole string */ |
| 1456 | ip = addrs; |
| 1457 | while (ip && *ip) { |
| 1458 | if ((cp = strchr(ip, ':'))) |
| 1459 | *cp++ = '\0'; |
| 1460 | if (strlen(ip) > 0) { |
| 1461 | DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); |
| 1462 | switch (num) { |
| 1463 | case 0: |
| 1464 | if ((ic_myaddr = in_aton(ip)) == INADDR_ANY) |
| 1465 | ic_myaddr = INADDR_NONE; |
| 1466 | break; |
| 1467 | case 1: |
| 1468 | if ((ic_servaddr = in_aton(ip)) == INADDR_ANY) |
| 1469 | ic_servaddr = INADDR_NONE; |
| 1470 | break; |
| 1471 | case 2: |
| 1472 | if ((ic_gateway = in_aton(ip)) == INADDR_ANY) |
| 1473 | ic_gateway = INADDR_NONE; |
| 1474 | break; |
| 1475 | case 3: |
| 1476 | if ((ic_netmask = in_aton(ip)) == INADDR_ANY) |
| 1477 | ic_netmask = INADDR_NONE; |
| 1478 | break; |
| 1479 | case 4: |
| 1480 | if ((dp = strchr(ip, '.'))) { |
| 1481 | *dp++ = '\0'; |
| 1482 | strlcpy(system_utsname.domainname, dp, |
| 1483 | sizeof(system_utsname.domainname)); |
| 1484 | } |
| 1485 | strlcpy(system_utsname.nodename, ip, |
| 1486 | sizeof(system_utsname.nodename)); |
| 1487 | ic_host_name_set = 1; |
| 1488 | break; |
| 1489 | case 5: |
| 1490 | strlcpy(user_dev_name, ip, sizeof(user_dev_name)); |
| 1491 | break; |
| 1492 | case 6: |
| 1493 | ic_proto_name(ip); |
| 1494 | break; |
| 1495 | } |
| 1496 | } |
| 1497 | ip = cp; |
| 1498 | num++; |
| 1499 | } |
| 1500 | |
| 1501 | return 1; |
| 1502 | } |
| 1503 | |
| 1504 | static int __init nfsaddrs_config_setup(char *addrs) |
| 1505 | { |
| 1506 | return ip_auto_config_setup(addrs); |
| 1507 | } |
| 1508 | |
| 1509 | __setup("ip=", ip_auto_config_setup); |
| 1510 | __setup("nfsaddrs=", nfsaddrs_config_setup); |