Linux 2.4.23 Networking: ipconfig.c Source File

00001 /* 00002 * $Id: ipconfig.c,v 1.43.2.1 2001/12/13 10:39:53 davem Exp $ 00003 * 00004 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or 00005 * user-supplied information to configure own IP address and routes. 00006 * 00007 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz> 00008 * 00009 * Derived from network configuration code in fs/nfs/nfsroot.c, 00010 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me. 00011 * 00012 * BOOTP rewritten to construct and analyse packets itself instead 00013 * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--; 00014 * -- MJ, December 1998 00015 * 00016 * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic" 00017 * initialization scheme. 00018 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999 00019 * 00020 * DHCP support added. To users this looks like a whole separate 00021 * protocol, but we know it's just a bag on the side of BOOTP. 00022 * -- Chip Salzenberg <chip@valinux.com>, May 2000 00023 * 00024 * Ported DHCP support from 2.2.16 to 2.4.0-test4 00025 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000 00026 * 00027 * Merged changes from 2.2.19 into 2.4.3 00028 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001 00029 * 00030 * Multipe Nameservers in /proc/net/pnp 00031 * -- Josef Siemes <jsiemes@web.de>, Aug 2002 00032 */ 00033 00034 #include <linux/config.h> 00035 #include <linux/types.h> 00036 #include <linux/string.h> 00037 #include <linux/kernel.h> 00038 #include <linux/sched.h> 00039 #include <linux/random.h> 00040 #include <linux/init.h> 00041 #include <linux/utsname.h> 00042 #include <linux/in.h> 00043 #include <linux/if.h> 00044 #include <linux/inet.h> 00045 #include <linux/netdevice.h> 00046 #include <linux/if_arp.h> 00047 #include <linux/skbuff.h> 00048 #include <linux/ip.h> 00049 #include <linux/socket.h> 00050 #include <linux/route.h> 00051 #include <linux/udp.h> 00052 #include <linux/proc_fs.h> 00053 #include <linux/major.h> 00054 #include <net/arp.h> 00055 #include <net/ip.h> 00056 #include <net/ipconfig.h> 00057 00058 #include <asm/uaccess.h> 00059 #include <asm/checksum.h> 00060 #include <asm/processor.h> 00061 00062 /* Define this to allow debugging output */ 00063 #undef IPCONFIG_DEBUG 00064 00065 #ifdef IPCONFIG_DEBUG 00066 #define DBG(x) printk x 00067 #else 00068 #define DBG(x) do { } while(0) 00069 #endif 00070 00071 #if defined(CONFIG_IP_PNP_DHCP) 00072 #define IPCONFIG_DHCP 00073 #endif 00074 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) 00075 #define IPCONFIG_BOOTP 00076 #endif 00077 #if defined(CONFIG_IP_PNP_RARP) 00078 #define IPCONFIG_RARP 00079 #endif 00080 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) 00081 #define IPCONFIG_DYNAMIC 00082 #endif 00083 00084 /* Define the friendly delay before and after opening net devices */ 00085 #define CONF_PRE_OPEN (HZ/2) /* Before opening: 1/2 second */ 00086 #define CONF_POST_OPEN (1*HZ) /* After opening: 1 second */ 00087 00088 /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ 00089 #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ 00090 #define CONF_SEND_RETRIES 6 /* Send six requests per open */ 00091 #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */ 00092 #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ 00093 #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ 00094 #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ 00095 #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ 00096 #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers 00097 - '3' from resolv.h */ 00098 00099 00100 /* 00101 * Public IP configuration 00102 */ 00103 00104 /* This is used by platforms which might be able to set the ipconfig 00105 * variables using firmware environment vars. If this is set, it will 00106 * ignore such firmware variables. 00107 */ 00108 int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ 00109 00110 int ic_enable __initdata = 0; /* IP config enabled? */ 00111 00112 /* Protocol choice */ 00113 int ic_proto_enabled __initdata = 0 00114 #ifdef IPCONFIG_BOOTP 00115 | IC_BOOTP 00116 #endif 00117 #ifdef CONFIG_IP_PNP_DHCP 00118 | IC_USE_DHCP 00119 #endif 00120 #ifdef IPCONFIG_RARP 00121 | IC_RARP 00122 #endif 00123 ; 00124 00125 int ic_host_name_set __initdata = 0; /* Host name set by us? */ 00126 00127 u32 ic_myaddr = INADDR_NONE; /* My IP address */ 00128 u32 ic_netmask = INADDR_NONE; /* Netmask for local subnet */ 00129 u32 ic_gateway = INADDR_NONE; /* Gateway IP address */ 00130 00131 u32 ic_servaddr = INADDR_NONE; /* Boot server IP address */ 00132 00133 u32 root_server_addr = INADDR_NONE; /* Address of NFS server */ 00134 u8 root_server_path[256] = { 0, }; /* Path to mount as root */ 00135 00136 /* Persistent data: */ 00137 00138 int ic_proto_used; /* Protocol used, if any */ 00139 u32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ 00140 u8 ic_domain[64]; /* DNS (not NIS) domain name */ 00141 00142 /* 00143 * Private state. 00144 */ 00145 00146 /* Name of user-selected boot device */ 00147 static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; 00148 00149 /* Protocols supported by available interfaces */ 00150 static int ic_proto_have_if __initdata = 0; 00151 00152 #ifdef IPCONFIG_DYNAMIC 00153 static spinlock_t ic_recv_lock = SPIN_LOCK_UNLOCKED; 00154 static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */ 00155 #endif 00156 #ifdef IPCONFIG_DHCP 00157 static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */ 00158 #endif 00159 00160 00161 /* 00162 * Network devices 00163 */ 00164 00165 struct ic_device { 00166 struct ic_device *next; 00167 struct net_device *dev; 00168 unsigned short flags; 00169 short able; 00170 u32 xid; 00171 }; 00172 00173 static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */ 00174 static struct net_device *ic_dev __initdata = NULL; /* Selected device */ 00175 00176 static int __init ic_open_devs(void) 00177 { 00178 struct ic_device *d, **last; 00179 struct net_device *dev; 00180 unsigned short oflags; 00181 00182 last = &ic_first_dev; 00183 rtnl_shlock(); 00184 for (dev = dev_base; dev; dev = dev->next) { 00185 if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : 00186 (!(dev->flags & IFF_LOOPBACK) && 00187 (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && 00188 strncmp(dev->name, "dummy", 5))) { 00189 int able = 0; 00190 if (dev->mtu >= 364) 00191 able |= IC_BOOTP; 00192 else 00193 printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu); 00194 if (!(dev->flags & IFF_NOARP)) 00195 able |= IC_RARP; 00196 able &= ic_proto_enabled; 00197 if (ic_proto_enabled && !able) 00198 continue; 00199 oflags = dev->flags; 00200 if (dev_change_flags(dev, oflags | IFF_UP) < 0) { 00201 printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); 00202 continue; 00203 } 00204 if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { 00205 rtnl_shunlock(); 00206 return -1; 00207 } 00208 d->dev = dev; 00209 *last = d; 00210 last = &d->next; 00211 d->flags = oflags; 00212 d->able = able; 00213 if (able & IC_BOOTP) 00214 get_random_bytes(&d->xid, sizeof(u32)); 00215 else 00216 d->xid = 0; 00217 ic_proto_have_if |= able; 00218 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", 00219 dev->name, able, d->xid)); 00220 } 00221 } 00222 rtnl_shunlock(); 00223 00224 *last = NULL; 00225 00226 if (!ic_first_dev) { 00227 if (user_dev_name[0]) 00228 printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name); 00229 else 00230 printk(KERN_ERR "IP-Config: No network devices available.\n"); 00231 return -1; 00232 } 00233 return 0; 00234 } 00235 00236 static void __init ic_close_devs(void) 00237 { 00238 struct ic_device *d, *next; 00239 struct net_device *dev; 00240 00241 rtnl_shlock(); 00242 next = ic_first_dev; 00243 while ((d = next)) { 00244 next = d->next; 00245 dev = d->dev; 00246 if (dev != ic_dev) { 00247 DBG(("IP-Config: Downing %s\n", dev->name)); 00248 dev_change_flags(dev, d->flags); 00249 } 00250 kfree(d); 00251 } 00252 rtnl_shunlock(); 00253 } 00254 00255 /* 00256 * Interface to various network functions. 00257 */ 00258 00259 static inline void 00260 set_sockaddr(struct sockaddr_in *sin, u32 addr, u16 port) 00261 { 00262 sin->sin_family = AF_INET; 00263 sin->sin_addr.s_addr = addr; 00264 sin->sin_port = port; 00265 } 00266 00267 static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) 00268 { 00269 int res; 00270 00271 mm_segment_t oldfs = get_fs(); 00272 set_fs(get_ds()); 00273 res = devinet_ioctl(cmd, arg); 00274 set_fs(oldfs); 00275 return res; 00276 } 00277 00278 static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) 00279 { 00280 int res; 00281 00282 mm_segment_t oldfs = get_fs(); 00283 set_fs(get_ds()); 00284 res = ip_rt_ioctl(cmd, arg); 00285 set_fs(oldfs); 00286 return res; 00287 } 00288 00289 /* 00290 * Set up interface addresses and routes. 00291 */ 00292 00293 static int __init ic_setup_if(void) 00294 { 00295 struct ifreq ir; 00296 struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; 00297 int err; 00298 00299 memset(&ir, 0, sizeof(ir)); 00300 strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); 00301 set_sockaddr(sin, ic_myaddr, 0); 00302 if ((err = ic_dev_ioctl(SIOCSIFADDR, &ir)) < 0) { 00303 printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err); 00304 return -1; 00305 } 00306 set_sockaddr(sin, ic_netmask, 0); 00307 if ((err = ic_dev_ioctl(SIOCSIFNETMASK, &ir)) < 0) { 00308 printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err); 00309 return -1; 00310 } 00311 set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); 00312 if ((err = ic_dev_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { 00313 printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err); 00314 return -1; 00315 } 00316 return 0; 00317 } 00318 00319 static int __init ic_setup_routes(void) 00320 { 00321 /* No need to setup device routes, only the default route... */ 00322 00323 if (ic_gateway != INADDR_NONE) { 00324 struct rtentry rm; 00325 int err; 00326 00327 memset(&rm, 0, sizeof(rm)); 00328 if ((ic_gateway ^ ic_myaddr) & ic_netmask) { 00329 printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n"); 00330 return -1; 00331 } 00332 set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); 00333 set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); 00334 set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); 00335 rm.rt_flags = RTF_UP | RTF_GATEWAY; 00336 if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { 00337 printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err); 00338 return -1; 00339 } 00340 } 00341 00342 return 0; 00343 } 00344 00345 /* 00346 * Fill in default values for all missing parameters. 00347 */ 00348 00349 static int __init ic_defaults(void) 00350 { 00351 /* 00352 * At this point we have no userspace running so need not 00353 * claim locks on system_utsname 00354 */ 00355 00356 if (!ic_host_name_set) 00357 sprintf(system_utsname.nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr)); 00358 00359 if (root_server_addr == INADDR_NONE) 00360 root_server_addr = ic_servaddr; 00361 00362 if (ic_netmask == INADDR_NONE) { 00363 if (IN_CLASSA(ntohl(ic_myaddr))) 00364 ic_netmask = htonl(IN_CLASSA_NET); 00365 else if (IN_CLASSB(ntohl(ic_myaddr))) 00366 ic_netmask = htonl(IN_CLASSB_NET); 00367 else if (IN_CLASSC(ntohl(ic_myaddr))) 00368 ic_netmask = htonl(IN_CLASSC_NET); 00369 else { 00370 printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n", 00371 NIPQUAD(ic_myaddr)); 00372 return -1; 00373 } 00374 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask)); 00375 } 00376 00377 return 0; 00378 } 00379 00380 /* 00381 * RARP support. 00382 */ 00383 00384 #ifdef IPCONFIG_RARP 00385 00386 static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt); 00387 00388 static struct packet_type rarp_packet_type __initdata = { 00389 type: __constant_htons(ETH_P_RARP), 00390 func: ic_rarp_recv, 00391 }; 00392 00393 static inline void ic_rarp_init(void) 00394 { 00395 dev_add_pack(&rarp_packet_type); 00396 } 00397 00398 static inline void ic_rarp_cleanup(void) 00399 { 00400 dev_remove_pack(&rarp_packet_type); 00401 } 00402 00403 /* 00404 * Process received RARP packet. 00405 */ 00406 static int __init 00407 ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt) 00408 { 00409 struct arphdr *rarp = (struct arphdr *)skb->h.raw; 00410 unsigned char *rarp_ptr = (unsigned char *) (rarp + 1); 00411 unsigned long sip, tip; 00412 unsigned char *sha, *tha; /* s for "source", t for "target" */ 00413 struct ic_device *d; 00414 00415 /* One reply at a time, please. */ 00416 spin_lock(&ic_recv_lock); 00417 00418 /* If we already have a reply, just drop the packet */ 00419 if (ic_got_reply) 00420 goto drop; 00421 00422 /* Find the ic_device that the packet arrived on */ 00423 d = ic_first_dev; 00424 while (d && d->dev != dev) 00425 d = d->next; 00426 if (!d) 00427 goto drop; /* should never happen */ 00428 00429 /* If this test doesn't pass, it's not IP, or we should ignore it anyway */ 00430 if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) 00431 goto drop; 00432 00433 /* If it's not a RARP reply, delete it. */ 00434 if (rarp->ar_op != htons(ARPOP_RREPLY)) 00435 goto drop; 00436 00437 /* If it's not Ethernet, delete it. */ 00438 if (rarp->ar_pro != htons(ETH_P_IP)) 00439 goto drop; 00440 00441 /* Extract variable-width fields */ 00442 sha = rarp_ptr; 00443 rarp_ptr += dev->addr_len; 00444 memcpy(&sip, rarp_ptr, 4); 00445 rarp_ptr += 4; 00446 tha = rarp_ptr; 00447 rarp_ptr += dev->addr_len; 00448 memcpy(&tip, rarp_ptr, 4); 00449 00450 /* Discard packets which are not meant for us. */ 00451 if (memcmp(tha, dev->dev_addr, dev->addr_len)) 00452 goto drop; 00453 00454 /* Discard packets which are not from specified server. */ 00455 if (ic_servaddr != INADDR_NONE && ic_servaddr != sip) 00456 goto drop; 00457 00458 /* We have a winner! */ 00459 ic_dev = dev; 00460 if (ic_myaddr == INADDR_NONE) 00461 ic_myaddr = tip; 00462 ic_servaddr = sip; 00463 ic_got_reply = IC_RARP; 00464 00465 drop: 00466 /* Show's over. Nothing to see here. */ 00467 spin_unlock(&ic_recv_lock); 00468 00469 /* Throw the packet out. */ 00470 kfree_skb(skb); 00471 return 0; 00472 } 00473 00474 00475 /* 00476 * Send RARP request packet over a single interface. 00477 */ 00478 static void __init ic_rarp_send_if(struct ic_device *d) 00479 { 00480 struct net_device *dev = d->dev; 00481 arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, 00482 dev->dev_addr, dev->dev_addr); 00483 } 00484 #endif 00485 00486 /* 00487 * DHCP/BOOTP support. 00488 */ 00489 00490 #ifdef IPCONFIG_BOOTP 00491 00492 struct bootp_pkt { /* BOOTP packet format */ 00493 struct iphdr iph; /* IP header */ 00494 struct udphdr udph; /* UDP header */ 00495 u8 op; /* 1=request, 2=reply */ 00496 u8 htype; /* HW address type */ 00497 u8 hlen; /* HW address length */ 00498 u8 hops; /* Used only by gateways */ 00499 u32 xid; /* Transaction ID */ 00500 u16 secs; /* Seconds since we started */ 00501 u16 flags; /* Just what it says */ 00502 u32 client_ip; /* Client's IP address if known */ 00503 u32 your_ip; /* Assigned IP address */ 00504 u32 server_ip; /* (Next, e.g. NFS) Server's IP address */ 00505 u32 relay_ip; /* IP address of BOOTP relay */ 00506 u8 hw_addr[16]; /* Client's HW address */ 00507 u8 serv_name[64]; /* Server host name */ 00508 u8 boot_file[128]; /* Name of boot file */ 00509 u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ 00510 }; 00511 00512 /* packet ops */ 00513 #define BOOTP_REQUEST 1 00514 #define BOOTP_REPLY 2 00515 00516 /* DHCP message types */ 00517 #define DHCPDISCOVER 1 00518 #define DHCPOFFER 2 00519 #define DHCPREQUEST 3 00520 #define DHCPDECLINE 4 00521 #define DHCPACK 5 00522 #define DHCPNAK 6 00523 #define DHCPRELEASE 7 00524 #define DHCPINFORM 8 00525 00526 static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt); 00527 00528 static struct packet_type bootp_packet_type __initdata = { 00529 type: __constant_htons(ETH_P_IP), 00530 func: ic_bootp_recv, 00531 }; 00532 00533 00534 /* 00535 * Initialize DHCP/BOOTP extension fields in the request. 00536 */ 00537 00538 static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; 00539 00540 #ifdef IPCONFIG_DHCP 00541 00542 static void __init 00543 ic_dhcp_init_options(u8 *options) 00544 { 00545 u8 mt = ((ic_servaddr == INADDR_NONE) 00546 ? DHCPDISCOVER : DHCPREQUEST); 00547 u8 *e = options; 00548 00549 #ifdef IPCONFIG_DEBUG 00550 printk("DHCP: Sending message type %d\n", mt); 00551 #endif 00552 00553 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 00554 e += 4; 00555 00556 *e++ = 53; /* DHCP message type */ 00557 *e++ = 1; 00558 *e++ = mt; 00559 00560 if (mt == DHCPREQUEST) { 00561 *e++ = 54; /* Server ID (IP address) */ 00562 *e++ = 4; 00563 memcpy(e, &ic_servaddr, 4); 00564 e += 4; 00565 00566 *e++ = 50; /* Requested IP address */ 00567 *e++ = 4; 00568 memcpy(e, &ic_myaddr, 4); 00569 e += 4; 00570 } 00571 00572 /* always? */ 00573 { 00574 static const u8 ic_req_params[] = { 00575 1, /* Subnet mask */ 00576 3, /* Default gateway */ 00577 6, /* DNS server */ 00578 12, /* Host name */ 00579 15, /* Domain name */ 00580 17, /* Boot path */ 00581 40, /* NIS domain name */ 00582 }; 00583 00584 *e++ = 55; /* Parameter request list */ 00585 *e++ = sizeof(ic_req_params); 00586 memcpy(e, ic_req_params, sizeof(ic_req_params)); 00587 e += sizeof(ic_req_params); 00588 } 00589 00590 *e++ = 255; /* End of the list */ 00591 } 00592 00593 #endif /* IPCONFIG_DHCP */ 00594 00595 static void __init ic_bootp_init_ext(u8 *e) 00596 { 00597 memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ 00598 e += 4; 00599 *e++ = 1; /* Subnet mask request */ 00600 *e++ = 4; 00601 e += 4; 00602 *e++ = 3; /* Default gateway request */ 00603 *e++ = 4; 00604 e += 4; 00605 *e++ = 5; /* Name server reqeust */ 00606 *e++ = 8; 00607 e += 8; 00608 *e++ = 12; /* Host name request */ 00609 *e++ = 32; 00610 e += 32; 00611 *e++ = 40; /* NIS Domain name request */ 00612 *e++ = 32; 00613 e += 32; 00614 *e++ = 17; /* Boot path */ 00615 *e++ = 40; 00616 e += 40; 00617 00618 *e++ = 57; /* set extension buffer size for reply */ 00619 *e++ = 2; 00620 *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ 00621 *e++ = 150; 00622 00623 *e++ = 255; /* End of the list */ 00624 } 00625 00626 00627 /* 00628 * Initialize the DHCP/BOOTP mechanism. 00629 */ 00630 static inline void ic_bootp_init(void) 00631 { 00632 int i; 00633 00634 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) 00635 ic_nameservers[i] = INADDR_NONE; 00636 00637 dev_add_pack(&bootp_packet_type); 00638 } 00639 00640 00641 /* 00642 * DHCP/BOOTP cleanup. 00643 */ 00644 static inline void ic_bootp_cleanup(void) 00645 { 00646 dev_remove_pack(&bootp_packet_type); 00647 } 00648 00649 00650 /* 00651 * Send DHCP/BOOTP request to single interface. 00652 */ 00653 static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) 00654 { 00655 struct net_device *dev = d->dev; 00656 struct sk_buff *skb; 00657 struct bootp_pkt *b; 00658 int hh_len = (dev->hard_header_len + 15) & ~15; 00659 struct iphdr *h; 00660 00661 /* Allocate packet */ 00662 skb = alloc_skb(sizeof(struct bootp_pkt) + hh_len + 15, GFP_KERNEL); 00663 if (!skb) 00664 return; 00665 skb_reserve(skb, hh_len); 00666 b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); 00667 memset(b, 0, sizeof(struct bootp_pkt)); 00668 00669 /* Construct IP header */ 00670 skb->nh.iph = h = &b->iph; 00671 h->version = 4; 00672 h->ihl = 5; 00673 h->tot_len = htons(sizeof(struct bootp_pkt)); 00674 h->frag_off = htons(IP_DF); 00675 h->ttl = 64; 00676 h->protocol = IPPROTO_UDP; 00677 h->daddr = INADDR_BROADCAST; 00678 h->check = ip_fast_csum((unsigned char *) h, h->ihl); 00679 00680 /* Construct UDP header */ 00681 b->udph.source = htons(68); 00682 b->udph.dest = htons(67); 00683 b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); 00684 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ 00685 00686 /* Construct DHCP/BOOTP header */ 00687 b->op = BOOTP_REQUEST; 00688 if (dev->type < 256) /* check for false types */ 00689 b->htype = dev->type; 00690 else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ 00691 b->htype = ARPHRD_IEEE802; 00692 else { 00693 printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); 00694 b->htype = dev->type; /* can cause undefined behavior */ 00695 } 00696 b->hlen = dev->addr_len; 00697 b->your_ip = INADDR_NONE; 00698 b->server_ip = INADDR_NONE; 00699 memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); 00700 b->secs = htons(jiffies_diff / HZ); 00701 b->xid = d->xid; 00702 00703 /* add DHCP options or BOOTP extensions */ 00704 #ifdef IPCONFIG_DHCP 00705 if (ic_proto_enabled & IC_USE_DHCP) 00706 ic_dhcp_init_options(b->exten); 00707 else 00708 #endif 00709 ic_bootp_init_ext(b->exten); 00710 00711 /* Chain packet down the line... */ 00712 skb->dev = dev; 00713 skb->protocol = htons(ETH_P_IP); 00714 if ((dev->hard_header && 00715 dev->hard_header(skb, dev, ntohs(skb->protocol), dev->broadcast, dev->dev_addr, skb->len) < 0) || 00716 dev_queue_xmit(skb) < 0) 00717 printk("E"); 00718 } 00719 00720 00721 /* 00722 * Copy BOOTP-supplied string if not already set. 00723 */ 00724 static int __init ic_bootp_string(char *dest, char *src, int len, int max) 00725 { 00726 if (!len) 00727 return 0; 00728 if (len > max-1) 00729 len = max-1; 00730 memcpy(dest, src, len); 00731 dest[len] = '\0'; 00732 return 1; 00733 } 00734 00735 00736 /* 00737 * Process BOOTP extensions. 00738 */ 00739 static void __init ic_do_bootp_ext(u8 *ext) 00740 { 00741 u8 servers; 00742 int i; 00743 00744 #ifdef IPCONFIG_DEBUG 00745 u8 *c; 00746 00747 printk("DHCP/BOOTP: Got extension %d:",*ext); 00748 for(c=ext+2; c<ext+2+ext[1]; c++) 00749 printk(" %02x", *c); 00750 printk("\n"); 00751 #endif 00752 00753 switch (*ext++) { 00754 case 1: /* Subnet mask */ 00755 if (ic_netmask == INADDR_NONE) 00756 memcpy(&ic_netmask, ext+1, 4); 00757 break; 00758 case 3: /* Default gateway */ 00759 if (ic_gateway == INADDR_NONE) 00760 memcpy(&ic_gateway, ext+1, 4); 00761 break; 00762 case 6: /* DNS server */ 00763 servers= *ext/4; 00764 if (servers > CONF_NAMESERVERS_MAX) 00765 servers = CONF_NAMESERVERS_MAX; 00766 for (i = 0; i < servers; i++) { 00767 if (ic_nameservers[i] == INADDR_NONE) 00768 memcpy(&ic_nameservers[i], ext+1+4*i, 4); 00769 } 00770 break; 00771 case 12: /* Host name */ 00772 ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN); 00773 ic_host_name_set = 1; 00774 break; 00775 case 15: /* Domain name (DNS) */ 00776 ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); 00777 break; 00778 case 17: /* Root path */ 00779 if (!root_server_path[0]) 00780 ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path)); 00781 break; 00782 case 40: /* NIS Domain name (_not_ DNS) */ 00783 ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN); 00784 break; 00785 } 00786 } 00787 00788 00789 /* 00790 * Receive BOOTP reply. 00791 */ 00792 static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt) 00793 { 00794 struct bootp_pkt *b = (struct bootp_pkt *) skb->nh.iph; 00795 struct iphdr *h = &b->iph; 00796 struct ic_device *d; 00797 int len; 00798 00799 /* One reply at a time, please. */ 00800 spin_lock(&ic_recv_lock); 00801 00802 /* If we already have a reply, just drop the packet */ 00803 if (ic_got_reply) 00804 goto drop; 00805 00806 /* Find the ic_device that the packet arrived on */ 00807 d = ic_first_dev; 00808 while (d && d->dev != dev) 00809 d = d->next; 00810 if (!d) 00811 goto drop; /* should never happen */ 00812 00813 /* Check whether it's a BOOTP packet */ 00814 if (skb->pkt_type == PACKET_OTHERHOST || 00815 skb->len < sizeof(struct udphdr) + sizeof(struct iphdr) || 00816 h->ihl != 5 || 00817 h->version != 4 || 00818 ip_fast_csum((char *) h, h->ihl) != 0 || 00819 skb->len < ntohs(h->tot_len) || 00820 h->protocol != IPPROTO_UDP || 00821 b->udph.source != htons(67) || 00822 b->udph.dest != htons(68) || 00823 ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) 00824 goto drop; 00825 00826 /* Fragments are not supported */ 00827 if (h->frag_off & htons(IP_OFFSET | IP_MF)) { 00828 printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented reply.\n"); 00829 goto drop; 00830 } 00831 00832 /* Is it a reply to our BOOTP request? */ 00833 len = ntohs(b->udph.len) - sizeof(struct udphdr); 00834 if (len < 300 || /* See RFC 951:2.1 */ 00835 b->op != BOOTP_REPLY || 00836 b->xid != d->xid) { 00837 printk("?"); 00838 goto drop; 00839 } 00840 00841 /* Parse extensions */ 00842 if (!memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ 00843 u8 *end = (u8 *) b + ntohs(b->iph.tot_len); 00844 u8 *ext; 00845 00846 #ifdef IPCONFIG_DHCP 00847 if (ic_proto_enabled & IC_USE_DHCP) { 00848 u32 server_id = INADDR_NONE; 00849 int mt = 0; 00850 00851 ext = &b->exten[4]; 00852 while (ext < end && *ext != 0xff) { 00853 u8 *opt = ext++; 00854 if (*opt == 0) /* Padding */ 00855 continue; 00856 ext += *ext + 1; 00857 if (ext >= end) 00858 break; 00859 switch (*opt) { 00860 case 53: /* Message type */ 00861 if (opt[1]) 00862 mt = opt[2]; 00863 break; 00864 case 54: /* Server ID (IP address) */ 00865 if (opt[1] >= 4) 00866 memcpy(&server_id, opt + 2, 4); 00867 break; 00868 }; 00869 } 00870 00871 #ifdef IPCONFIG_DEBUG 00872 printk("DHCP: Got message type %d\n", mt); 00873 #endif 00874 00875 switch (mt) { 00876 case DHCPOFFER: 00877 /* While in the process of accepting one offer, 00878 * ignore all others. 00879 */ 00880 if (ic_myaddr != INADDR_NONE) 00881 goto drop; 00882 00883 /* Let's accept that offer. */ 00884 ic_myaddr = b->your_ip; 00885 ic_servaddr = server_id; 00886 #ifdef IPCONFIG_DEBUG 00887 printk("DHCP: Offered address %u.%u.%u.%u", 00888 NIPQUAD(ic_myaddr)); 00889 printk(" by server %u.%u.%u.%u\n", 00890 NIPQUAD(ic_servaddr)); 00891 #endif 00892 /* The DHCP indicated server address takes 00893 * precedence over the bootp header one if 00894 * they are different. 00895 */ 00896 if ((server_id != INADDR_NONE) && 00897 (b->server_ip != server_id)) 00898 b->server_ip = ic_servaddr; 00899 break; 00900 00901 case DHCPACK: 00902 /* Yeah! */ 00903 break; 00904 00905 default: 00906 /* Urque. Forget it*/ 00907 ic_myaddr = INADDR_NONE; 00908 ic_servaddr = INADDR_NONE; 00909 goto drop; 00910 }; 00911 00912 ic_dhcp_msgtype = mt; 00913 00914 } 00915 #endif /* IPCONFIG_DHCP */ 00916 00917 ext = &b->exten[4]; 00918 while (ext < end && *ext != 0xff) { 00919 u8 *opt = ext++; 00920 if (*opt == 0) /* Padding */ 00921 continue; 00922 ext += *ext + 1; 00923 if (ext < end) 00924 ic_do_bootp_ext(opt); 00925 } 00926 } 00927 00928 /* We have a winner! */ 00929 ic_dev = dev; 00930 ic_myaddr = b->your_ip; 00931 ic_servaddr = b->server_ip; 00932 if (ic_gateway == INADDR_NONE && b->relay_ip) 00933 ic_gateway = b->relay_ip; 00934 if (ic_nameservers[0] == INADDR_NONE) 00935 ic_nameservers[0] = ic_servaddr; 00936 ic_got_reply = IC_BOOTP; 00937 00938 drop: 00939 /* Show's over. Nothing to see here. */ 00940 spin_unlock(&ic_recv_lock); 00941 00942 /* Throw the packet out. */ 00943 kfree_skb(skb); 00944 00945 return 0; 00946 } 00947 00948 00949 #endif 00950 00951 00952 /* 00953 * Dynamic IP configuration -- DHCP, BOOTP, RARP. 00954 */ 00955 00956 #ifdef IPCONFIG_DYNAMIC 00957 00958 static int __init ic_dynamic(void) 00959 { 00960 int retries; 00961 struct ic_device *d; 00962 unsigned long start_jiffies, timeout, jiff; 00963 int do_bootp = ic_proto_have_if & IC_BOOTP; 00964 int do_rarp = ic_proto_have_if & IC_RARP; 00965 00966 /* 00967 * If none of DHCP/BOOTP/RARP was selected, return with an error. 00968 * This routine gets only called when some pieces of information 00969 * are missing, and without DHCP/BOOTP/RARP we are unable to get it. 00970 */ 00971 if (!ic_proto_enabled) { 00972 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 00973 return -1; 00974 } 00975 00976 #ifdef IPCONFIG_BOOTP 00977 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) 00978 printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); 00979 #endif 00980 #ifdef IPCONFIG_RARP 00981 if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) 00982 printk(KERN_ERR "RARP: No suitable device found.\n"); 00983 #endif 00984 00985 if (!ic_proto_have_if) 00986 /* Error message already printed */ 00987 return -1; 00988 00989 /* 00990 * Setup protocols 00991 */ 00992 #ifdef IPCONFIG_BOOTP 00993 if (do_bootp) 00994 ic_bootp_init(); 00995 #endif 00996 #ifdef IPCONFIG_RARP 00997 if (do_rarp) 00998 ic_rarp_init(); 00999 #endif 01000 01001 /* 01002 * Send requests and wait, until we get an answer. This loop 01003 * seems to be a terrible waste of CPU time, but actually there is 01004 * only one process running at all, so we don't need to use any 01005 * scheduler functions. 01006 * [Actually we could now, but the nothing else running note still 01007 * applies.. - AC] 01008 */ 01009 printk(KERN_NOTICE "Sending %s%s%s requests .", 01010 do_bootp 01011 ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", 01012 (do_bootp && do_rarp) ? " and " : "", 01013 do_rarp ? "RARP" : ""); 01014 01015 start_jiffies = jiffies; 01016 d = ic_first_dev; 01017 retries = CONF_SEND_RETRIES; 01018 get_random_bytes(&timeout, sizeof(timeout)); 01019 timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); 01020 for(;;) { 01021 #ifdef IPCONFIG_BOOTP 01022 if (do_bootp && (d->able & IC_BOOTP)) 01023 ic_bootp_send_if(d, jiffies - start_jiffies); 01024 #endif 01025 #ifdef IPCONFIG_RARP 01026 if (do_rarp && (d->able & IC_RARP)) 01027 ic_rarp_send_if(d); 01028 #endif 01029 01030 jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); 01031 while (time_before(jiffies, jiff) && !ic_got_reply) { 01032 barrier(); 01033 cpu_relax(); 01034 } 01035 #ifdef IPCONFIG_DHCP 01036 /* DHCP isn't done until we get a DHCPACK. */ 01037 if ((ic_got_reply & IC_BOOTP) 01038 && (ic_proto_enabled & IC_USE_DHCP) 01039 && ic_dhcp_msgtype != DHCPACK) 01040 { 01041 ic_got_reply = 0; 01042 printk(","); 01043 continue; 01044 } 01045 #endif /* IPCONFIG_DHCP */ 01046 01047 if (ic_got_reply) { 01048 printk(" OK\n"); 01049 break; 01050 } 01051 01052 if ((d = d->next)) 01053 continue; 01054 01055 if (! --retries) { 01056 printk(" timed out!\n"); 01057 break; 01058 } 01059 01060 d = ic_first_dev; 01061 01062 timeout = timeout CONF_TIMEOUT_MULT; 01063 if (timeout > CONF_TIMEOUT_MAX) 01064 timeout = CONF_TIMEOUT_MAX; 01065 01066 printk("."); 01067 } 01068 01069 #ifdef IPCONFIG_BOOTP 01070 if (do_bootp) 01071 ic_bootp_cleanup(); 01072 #endif 01073 #ifdef IPCONFIG_RARP 01074 if (do_rarp) 01075 ic_rarp_cleanup(); 01076 #endif 01077 01078 if (!ic_got_reply) 01079 return -1; 01080 01081 printk("IP-Config: Got %s answer from %u.%u.%u.%u, ", 01082 ((ic_got_reply & IC_RARP) ? "RARP" 01083 : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), 01084 NIPQUAD(ic_servaddr)); 01085 printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr)); 01086 01087 return 0; 01088 } 01089 01090 #endif /* IPCONFIG_DYNAMIC */ 01091 01092 #ifdef CONFIG_PROC_FS 01093 01094 static int pnp_get_info(char *buffer, char **start, 01095 off_t offset, int length) 01096 { 01097 int len; 01098 int i; 01099 01100 if (ic_proto_used & IC_PROTO) 01101 sprintf(buffer, "#PROTO: %s\n", 01102 (ic_proto_used & IC_RARP) ? "RARP" 01103 : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); 01104 else 01105 strcpy(buffer, "#MANUAL\n"); 01106 len = strlen(buffer); 01107 01108 if (ic_domain[0]) 01109 len += sprintf(buffer + len, 01110 "domain %s\n", ic_domain); 01111 for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { 01112 if (ic_nameservers[i] != INADDR_NONE) 01113 len += sprintf(buffer + len, 01114 "nameserver %u.%u.%u.%u\n", 01115 NIPQUAD(ic_nameservers[i])); 01116 } 01117 if (ic_servaddr != INADDR_NONE) 01118 len += sprintf(buffer + len, 01119 "bootserver %u.%u.%u.%u\n", 01120 NIPQUAD(ic_servaddr)); 01121 01122 if (offset > len) 01123 offset = len; 01124 *start = buffer + offset; 01125 01126 if (offset + length > len) 01127 length = len - offset; 01128 return length; 01129 } 01130 01131 #endif /* CONFIG_PROC_FS */ 01132 01133 /* 01134 * Extract IP address from the parameter string if needed. Note that we 01135 * need to have root_server_addr set _before_ IPConfig gets called as it 01136 * can override it. 01137 */ 01138 u32 __init root_nfs_parse_addr(char *name) 01139 { 01140 u32 addr; 01141 int octets = 0; 01142 char *cp, *cq; 01143 01144 cp = cq = name; 01145 while (octets < 4) { 01146 while (*cp >= '0' && *cp <= '9') 01147 cp++; 01148 if (cp == cq || cp - cq > 3) 01149 break; 01150 if (*cp == '.' || octets == 3) 01151 octets++; 01152 if (octets < 4) 01153 cp++; 01154 cq = cp; 01155 } 01156 if (octets == 4 && (*cp == ':' || *cp == '\0')) { 01157 if (*cp == ':') 01158 *cp++ = '\0'; 01159 addr = in_aton(name); 01160 strcpy(name, cp); 01161 } else 01162 addr = INADDR_NONE; 01163 01164 return addr; 01165 } 01166 01167 /* 01168 * IP Autoconfig dispatcher. 01169 */ 01170 01171 static int __init ip_auto_config(void) 01172 { 01173 unsigned long jiff; 01174 u32 addr; 01175 01176 #ifdef CONFIG_PROC_FS 01177 proc_net_create("pnp", 0, pnp_get_info); 01178 #endif /* CONFIG_PROC_FS */ 01179 01180 if (!ic_enable) 01181 return 0; 01182 01183 DBG(("IP-Config: Entered.\n")); 01184 01185 #ifdef IPCONFIG_DYNAMIC 01186 try_try_again: 01187 #endif 01188 /* Give hardware a chance to settle */ 01189 jiff = jiffies + CONF_PRE_OPEN; 01190 while (time_before(jiffies, jiff)) 01191 ; 01192 01193 /* Setup all network devices */ 01194 if (ic_open_devs() < 0) 01195 return -1; 01196 01197 /* Give drivers a chance to settle */ 01198 jiff = jiffies + CONF_POST_OPEN; 01199 while (time_before(jiffies, jiff)) 01200 ; 01201 01202 /* 01203 * If the config information is insufficient (e.g., our IP address or 01204 * IP address of the boot server is missing or we have multiple network 01205 * interfaces and no default was set), use BOOTP or RARP to get the 01206 * missing values. 01207 */ 01208 if (ic_myaddr == INADDR_NONE || 01209 #ifdef CONFIG_ROOT_NFS 01210 (MAJOR(ROOT_DEV) == UNNAMED_MAJOR 01211 && root_server_addr == INADDR_NONE 01212 && ic_servaddr == INADDR_NONE) || 01213 #endif 01214 ic_first_dev->next) { 01215 #ifdef IPCONFIG_DYNAMIC 01216 01217 int retries = CONF_OPEN_RETRIES; 01218 01219 if (ic_dynamic() < 0) { 01220 ic_close_devs(); 01221 01222 /* 01223 * I don't know why, but sometimes the 01224 * eepro100 driver (at least) gets upset and 01225 * doesn't work the first time it's opened. 01226 * But then if you close it and reopen it, it 01227 * works just fine. So we need to try that at 01228 * least once before giving up. 01229 * 01230 * Also, if the root will be NFS-mounted, we 01231 * have nowhere to go if DHCP fails. So we 01232 * just have to keep trying forever. 01233 * 01234 * -- Chip 01235 */ 01236 #ifdef CONFIG_ROOT_NFS 01237 if (ROOT_DEV == MKDEV(NFS_MAJOR, NFS_MINOR)) { 01238 printk(KERN_ERR 01239 "IP-Config: Retrying forever (NFS root)...\n"); 01240 goto try_try_again; 01241 } 01242 #endif 01243 01244 if (--retries) { 01245 printk(KERN_ERR 01246 "IP-Config: Reopening network devices...\n"); 01247 goto try_try_again; 01248 } 01249 01250 /* Oh, well. At least we tried. */ 01251 printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); 01252 return -1; 01253 } 01254 #else /* !DYNAMIC */ 01255 printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); 01256 ic_close_devs(); 01257 return -1; 01258 #endif /* IPCONFIG_DYNAMIC */ 01259 } else { 01260 /* Device selected manually or only one device -> use it */ 01261 ic_dev = ic_first_dev->dev; 01262 } 01263 01264 addr = root_nfs_parse_addr(root_server_path); 01265 if (root_server_addr == INADDR_NONE) 01266 root_server_addr = addr; 01267 01268 /* 01269 * Use defaults whereever applicable. 01270 */ 01271 if (ic_defaults() < 0) 01272 return -1; 01273 01274 /* 01275 * Close all network devices except the device we've 01276 * autoconfigured and set up routes. 01277 */ 01278 ic_close_devs(); 01279 if (ic_setup_if() < 0 || ic_setup_routes() < 0) 01280 return -1; 01281 01282 /* 01283 * Record which protocol was actually used. 01284 */ 01285 #ifdef IPCONFIG_DYNAMIC 01286 ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); 01287 #endif 01288 01289 #ifndef IPCONFIG_SILENT 01290 /* 01291 * Clue in the operator. 01292 */ 01293 printk("IP-Config: Complete:"); 01294 printk("\n device=%s", ic_dev->name); 01295 printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr)); 01296 printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask)); 01297 printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway)); 01298 printk(",\n host=%s, domain=%s, nis-domain=%s", 01299 system_utsname.nodename, ic_domain, system_utsname.domainname); 01300 printk(",\n bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr)); 01301 printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr)); 01302 printk(", rootpath=%s", root_server_path); 01303 printk("\n"); 01304 #endif /* !SILENT */ 01305 01306 return 0; 01307 } 01308 01309 module_init(ip_auto_config); 01310 01311 01312 /* 01313 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel 01314 * command line parameter. It consists of option fields separated by colons in 01315 * the following order: 01316 * 01317 * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO> 01318 * 01319 * Any of the fields can be empty which means to use a default value: 01320 * <client-ip> - address given by BOOTP or RARP 01321 * <server-ip> - address of host returning BOOTP or RARP packet 01322 * <gw-ip> - none, or the address returned by BOOTP 01323 * <netmask> - automatically determined from <client-ip>, or the 01324 * one returned by BOOTP 01325 * <host name> - <client-ip> in ASCII notation, or the name returned 01326 * by BOOTP 01327 * <device> - use all available devices 01328 * <PROTO>: 01329 * off|none - don't do autoconfig at all (DEFAULT) 01330 * on|any - use any configured protocol 01331 * dhcp|bootp|rarp - use only the specified protocol 01332 * both - use both BOOTP and RARP (not DHCP) 01333 */ 01334 static int __init ic_proto_name(char *name) 01335 { 01336 if (!strcmp(name, "on") || !strcmp(name, "any")) { 01337 return 1; 01338 } 01339 #ifdef CONFIG_IP_PNP_DHCP 01340 else if (!strcmp(name, "dhcp")) { 01341 ic_proto_enabled &= ~IC_RARP; 01342 return 1; 01343 } 01344 #endif 01345 #ifdef CONFIG_IP_PNP_BOOTP 01346 else if (!strcmp(name, "bootp")) { 01347 ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); 01348 return 1; 01349 } 01350 #endif 01351 #ifdef CONFIG_IP_PNP_RARP 01352 else if (!strcmp(name, "rarp")) { 01353 ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); 01354 return 1; 01355 } 01356 #endif 01357 #ifdef IPCONFIG_DYNAMIC 01358 else if (!strcmp(name, "both")) { 01359 ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ 01360 return 1; 01361 } 01362 #endif 01363 return 0; 01364 } 01365 01366 static int __init ip_auto_config_setup(char *addrs) 01367 { 01368 char *cp, *ip, *dp; 01369 int num = 0; 01370 01371 ic_set_manually = 1; 01372 01373 ic_enable = (*addrs && 01374 (strcmp(addrs, "off") != 0) && 01375 (strcmp(addrs, "none") != 0)); 01376 if (!ic_enable) 01377 return 1; 01378 01379 if (ic_proto_name(addrs)) 01380 return 1; 01381 01382 /* Parse the whole string */ 01383 ip = addrs; 01384 while (ip && *ip) { 01385 if ((cp = strchr(ip, ':'))) 01386 *cp++ = '\0'; 01387 if (strlen(ip) > 0) { 01388 DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); 01389 switch (num) { 01390 case 0: 01391 if ((ic_myaddr = in_aton(ip)) == INADDR_ANY) 01392 ic_myaddr = INADDR_NONE; 01393 break; 01394 case 1: 01395 if ((ic_servaddr = in_aton(ip)) == INADDR_ANY) 01396 ic_servaddr = INADDR_NONE; 01397 break; 01398 case 2: 01399 if ((ic_gateway = in_aton(ip)) == INADDR_ANY) 01400 ic_gateway = INADDR_NONE; 01401 break; 01402 case 3: 01403 if ((ic_netmask = in_aton(ip)) == INADDR_ANY) 01404 ic_netmask = INADDR_NONE; 01405 break; 01406 case 4: 01407 if ((dp = strchr(ip, '.'))) { 01408 *dp++ = '\0'; 01409 strncpy(system_utsname.domainname, dp, __NEW_UTS_LEN); 01410 system_utsname.domainname[__NEW_UTS_LEN] = '\0'; 01411 } 01412 strncpy(system_utsname.nodename, ip, __NEW_UTS_LEN); 01413 system_utsname.nodename[__NEW_UTS_LEN] = '\0'; 01414 ic_host_name_set = 1; 01415 break; 01416 case 5: 01417 strncpy(user_dev_name, ip, IFNAMSIZ); 01418 user_dev_name[IFNAMSIZ-1] = '\0'; 01419 break; 01420 case 6: 01421 ic_proto_name(ip); 01422 break; 01423 } 01424 } 01425 ip = cp; 01426 num++; 01427 } 01428 01429 return 1; 01430 } 01431 01432 static int __init nfsaddrs_config_setup(char *addrs) 01433 { 01434 return ip_auto_config_setup(addrs); 01435 } 01436 01437 __setup("ip=", ip_auto_config_setup); 01438 __setup("nfsaddrs=", nfsaddrs_config_setup);