Root/
1 | /* |
2 | * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or |
3 | * user-supplied information to configure own IP address and routes. |
4 | * |
5 | * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz> |
6 | * |
7 | * Derived from network configuration code in fs/nfs/nfsroot.c, |
8 | * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me. |
9 | * |
10 | * BOOTP rewritten to construct and analyse packets itself instead |
11 | * of misusing the IP layer. num_bugs_causing_wrong_arp_replies--; |
12 | * -- MJ, December 1998 |
13 | * |
14 | * Fixed ip_auto_config_setup calling at startup in the new "Linker Magic" |
15 | * initialization scheme. |
16 | * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999 |
17 | * |
18 | * DHCP support added. To users this looks like a whole separate |
19 | * protocol, but we know it's just a bag on the side of BOOTP. |
20 | * -- Chip Salzenberg <chip@valinux.com>, May 2000 |
21 | * |
22 | * Ported DHCP support from 2.2.16 to 2.4.0-test4 |
23 | * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000 |
24 | * |
25 | * Merged changes from 2.2.19 into 2.4.3 |
26 | * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001 |
27 | * |
28 | * Multiple Nameservers in /proc/net/pnp |
29 | * -- Josef Siemes <jsiemes@web.de>, Aug 2002 |
30 | */ |
31 | |
32 | #include <linux/types.h> |
33 | #include <linux/string.h> |
34 | #include <linux/kernel.h> |
35 | #include <linux/jiffies.h> |
36 | #include <linux/random.h> |
37 | #include <linux/init.h> |
38 | #include <linux/utsname.h> |
39 | #include <linux/in.h> |
40 | #include <linux/if.h> |
41 | #include <linux/inet.h> |
42 | #include <linux/inetdevice.h> |
43 | #include <linux/netdevice.h> |
44 | #include <linux/if_arp.h> |
45 | #include <linux/skbuff.h> |
46 | #include <linux/ip.h> |
47 | #include <linux/socket.h> |
48 | #include <linux/route.h> |
49 | #include <linux/udp.h> |
50 | #include <linux/proc_fs.h> |
51 | #include <linux/seq_file.h> |
52 | #include <linux/major.h> |
53 | #include <linux/root_dev.h> |
54 | #include <linux/delay.h> |
55 | #include <linux/nfs_fs.h> |
56 | #include <net/net_namespace.h> |
57 | #include <net/arp.h> |
58 | #include <net/ip.h> |
59 | #include <net/ipconfig.h> |
60 | #include <net/route.h> |
61 | |
62 | #include <asm/uaccess.h> |
63 | #include <net/checksum.h> |
64 | #include <asm/processor.h> |
65 | |
66 | /* Define this to allow debugging output */ |
67 | #undef IPCONFIG_DEBUG |
68 | |
69 | #ifdef IPCONFIG_DEBUG |
70 | #define DBG(x) printk x |
71 | #else |
72 | #define DBG(x) do { } while(0) |
73 | #endif |
74 | |
75 | #if defined(CONFIG_IP_PNP_DHCP) |
76 | #define IPCONFIG_DHCP |
77 | #endif |
78 | #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) |
79 | #define IPCONFIG_BOOTP |
80 | #endif |
81 | #if defined(CONFIG_IP_PNP_RARP) |
82 | #define IPCONFIG_RARP |
83 | #endif |
84 | #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) |
85 | #define IPCONFIG_DYNAMIC |
86 | #endif |
87 | |
88 | /* Define the friendly delay before and after opening net devices */ |
89 | #define CONF_PRE_OPEN 500 /* Before opening: 1/2 second */ |
90 | #define CONF_POST_OPEN 1 /* After opening: 1 second */ |
91 | |
92 | /* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ |
93 | #define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ |
94 | #define CONF_SEND_RETRIES 6 /* Send six requests per open */ |
95 | #define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */ |
96 | #define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ |
97 | #define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ |
98 | #define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ |
99 | #define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ |
100 | #define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers |
101 | - '3' from resolv.h */ |
102 | |
103 | #define NONE cpu_to_be32(INADDR_NONE) |
104 | #define ANY cpu_to_be32(INADDR_ANY) |
105 | |
106 | /* |
107 | * Public IP configuration |
108 | */ |
109 | |
110 | /* This is used by platforms which might be able to set the ipconfig |
111 | * variables using firmware environment vars. If this is set, it will |
112 | * ignore such firmware variables. |
113 | */ |
114 | int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ |
115 | |
116 | static int ic_enable __initdata = 0; /* IP config enabled? */ |
117 | |
118 | /* Protocol choice */ |
119 | int ic_proto_enabled __initdata = 0 |
120 | #ifdef IPCONFIG_BOOTP |
121 | | IC_BOOTP |
122 | #endif |
123 | #ifdef CONFIG_IP_PNP_DHCP |
124 | | IC_USE_DHCP |
125 | #endif |
126 | #ifdef IPCONFIG_RARP |
127 | | IC_RARP |
128 | #endif |
129 | ; |
130 | |
131 | static int ic_host_name_set __initdata = 0; /* Host name set by us? */ |
132 | |
133 | __be32 ic_myaddr = NONE; /* My IP address */ |
134 | static __be32 ic_netmask = NONE; /* Netmask for local subnet */ |
135 | __be32 ic_gateway = NONE; /* Gateway IP address */ |
136 | |
137 | __be32 ic_servaddr = NONE; /* Boot server IP address */ |
138 | |
139 | __be32 root_server_addr = NONE; /* Address of NFS server */ |
140 | u8 root_server_path[256] = { 0, }; /* Path to mount as root */ |
141 | |
142 | u32 ic_dev_xid; /* Device under configuration */ |
143 | |
144 | /* vendor class identifier */ |
145 | static char vendor_class_identifier[253] __initdata; |
146 | |
147 | /* Persistent data: */ |
148 | |
149 | static int ic_proto_used; /* Protocol used, if any */ |
150 | static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ |
151 | static u8 ic_domain[64]; /* DNS (not NIS) domain name */ |
152 | |
153 | /* |
154 | * Private state. |
155 | */ |
156 | |
157 | /* Name of user-selected boot device */ |
158 | static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; |
159 | |
160 | /* Protocols supported by available interfaces */ |
161 | static int ic_proto_have_if __initdata = 0; |
162 | |
163 | /* MTU for boot device */ |
164 | static int ic_dev_mtu __initdata = 0; |
165 | |
166 | #ifdef IPCONFIG_DYNAMIC |
167 | static DEFINE_SPINLOCK(ic_recv_lock); |
168 | static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */ |
169 | #endif |
170 | #ifdef IPCONFIG_DHCP |
171 | static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */ |
172 | #endif |
173 | |
174 | |
175 | /* |
176 | * Network devices |
177 | */ |
178 | |
179 | struct ic_device { |
180 | struct ic_device *next; |
181 | struct net_device *dev; |
182 | unsigned short flags; |
183 | short able; |
184 | __be32 xid; |
185 | }; |
186 | |
187 | static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */ |
188 | static struct net_device *ic_dev __initdata = NULL; /* Selected device */ |
189 | |
190 | static int __init ic_open_devs(void) |
191 | { |
192 | struct ic_device *d, **last; |
193 | struct net_device *dev; |
194 | unsigned short oflags; |
195 | |
196 | last = &ic_first_dev; |
197 | rtnl_lock(); |
198 | |
199 | /* bring loopback device up first */ |
200 | for_each_netdev(&init_net, dev) { |
201 | if (!(dev->flags & IFF_LOOPBACK)) |
202 | continue; |
203 | if (dev_change_flags(dev, dev->flags | IFF_UP) < 0) |
204 | printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); |
205 | } |
206 | |
207 | for_each_netdev(&init_net, dev) { |
208 | if (dev->flags & IFF_LOOPBACK) |
209 | continue; |
210 | if (user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : |
211 | (!(dev->flags & IFF_LOOPBACK) && |
212 | (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && |
213 | strncmp(dev->name, "dummy", 5))) { |
214 | int able = 0; |
215 | if (dev->mtu >= 364) |
216 | able |= IC_BOOTP; |
217 | else |
218 | printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu); |
219 | if (!(dev->flags & IFF_NOARP)) |
220 | able |= IC_RARP; |
221 | able &= ic_proto_enabled; |
222 | if (ic_proto_enabled && !able) |
223 | continue; |
224 | oflags = dev->flags; |
225 | if (dev_change_flags(dev, oflags | IFF_UP) < 0) { |
226 | printk(KERN_ERR "IP-Config: Failed to open %s\n", dev->name); |
227 | continue; |
228 | } |
229 | if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { |
230 | rtnl_unlock(); |
231 | return -1; |
232 | } |
233 | d->dev = dev; |
234 | *last = d; |
235 | last = &d->next; |
236 | d->flags = oflags; |
237 | d->able = able; |
238 | if (able & IC_BOOTP) |
239 | get_random_bytes(&d->xid, sizeof(__be32)); |
240 | else |
241 | d->xid = 0; |
242 | ic_proto_have_if |= able; |
243 | DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n", |
244 | dev->name, able, d->xid)); |
245 | } |
246 | } |
247 | rtnl_unlock(); |
248 | |
249 | *last = NULL; |
250 | |
251 | if (!ic_first_dev) { |
252 | if (user_dev_name[0]) |
253 | printk(KERN_ERR "IP-Config: Device `%s' not found.\n", user_dev_name); |
254 | else |
255 | printk(KERN_ERR "IP-Config: No network devices available.\n"); |
256 | return -1; |
257 | } |
258 | return 0; |
259 | } |
260 | |
261 | static void __init ic_close_devs(void) |
262 | { |
263 | struct ic_device *d, *next; |
264 | struct net_device *dev; |
265 | |
266 | rtnl_lock(); |
267 | next = ic_first_dev; |
268 | while ((d = next)) { |
269 | next = d->next; |
270 | dev = d->dev; |
271 | if (dev != ic_dev) { |
272 | DBG(("IP-Config: Downing %s\n", dev->name)); |
273 | dev_change_flags(dev, d->flags); |
274 | } |
275 | kfree(d); |
276 | } |
277 | rtnl_unlock(); |
278 | } |
279 | |
280 | /* |
281 | * Interface to various network functions. |
282 | */ |
283 | |
284 | static inline void |
285 | set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) |
286 | { |
287 | sin->sin_family = AF_INET; |
288 | sin->sin_addr.s_addr = addr; |
289 | sin->sin_port = port; |
290 | } |
291 | |
292 | static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg) |
293 | { |
294 | int res; |
295 | |
296 | mm_segment_t oldfs = get_fs(); |
297 | set_fs(get_ds()); |
298 | res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg); |
299 | set_fs(oldfs); |
300 | return res; |
301 | } |
302 | |
303 | static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg) |
304 | { |
305 | int res; |
306 | |
307 | mm_segment_t oldfs = get_fs(); |
308 | set_fs(get_ds()); |
309 | res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg); |
310 | set_fs(oldfs); |
311 | return res; |
312 | } |
313 | |
314 | static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg) |
315 | { |
316 | int res; |
317 | |
318 | mm_segment_t oldfs = get_fs(); |
319 | set_fs(get_ds()); |
320 | res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg); |
321 | set_fs(oldfs); |
322 | return res; |
323 | } |
324 | |
325 | /* |
326 | * Set up interface addresses and routes. |
327 | */ |
328 | |
329 | static int __init ic_setup_if(void) |
330 | { |
331 | struct ifreq ir; |
332 | struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; |
333 | int err; |
334 | |
335 | memset(&ir, 0, sizeof(ir)); |
336 | strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->name); |
337 | set_sockaddr(sin, ic_myaddr, 0); |
338 | if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) { |
339 | printk(KERN_ERR "IP-Config: Unable to set interface address (%d).\n", err); |
340 | return -1; |
341 | } |
342 | set_sockaddr(sin, ic_netmask, 0); |
343 | if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) { |
344 | printk(KERN_ERR "IP-Config: Unable to set interface netmask (%d).\n", err); |
345 | return -1; |
346 | } |
347 | set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); |
348 | if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) { |
349 | printk(KERN_ERR "IP-Config: Unable to set interface broadcast address (%d).\n", err); |
350 | return -1; |
351 | } |
352 | /* Handle the case where we need non-standard MTU on the boot link (a network |
353 | * using jumbo frames, for instance). If we can't set the mtu, don't error |
354 | * out, we'll try to muddle along. |
355 | */ |
356 | if (ic_dev_mtu != 0) { |
357 | strcpy(ir.ifr_name, ic_dev->name); |
358 | ir.ifr_mtu = ic_dev_mtu; |
359 | if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0) |
360 | printk(KERN_ERR "IP-Config: Unable to set interface mtu to %d (%d).\n", |
361 | ic_dev_mtu, err); |
362 | } |
363 | return 0; |
364 | } |
365 | |
366 | static int __init ic_setup_routes(void) |
367 | { |
368 | /* No need to setup device routes, only the default route... */ |
369 | |
370 | if (ic_gateway != NONE) { |
371 | struct rtentry rm; |
372 | int err; |
373 | |
374 | memset(&rm, 0, sizeof(rm)); |
375 | if ((ic_gateway ^ ic_myaddr) & ic_netmask) { |
376 | printk(KERN_ERR "IP-Config: Gateway not on directly connected network.\n"); |
377 | return -1; |
378 | } |
379 | set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); |
380 | set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); |
381 | set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); |
382 | rm.rt_flags = RTF_UP | RTF_GATEWAY; |
383 | if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) { |
384 | printk(KERN_ERR "IP-Config: Cannot add default route (%d).\n", err); |
385 | return -1; |
386 | } |
387 | } |
388 | |
389 | return 0; |
390 | } |
391 | |
392 | /* |
393 | * Fill in default values for all missing parameters. |
394 | */ |
395 | |
396 | static int __init ic_defaults(void) |
397 | { |
398 | /* |
399 | * At this point we have no userspace running so need not |
400 | * claim locks on system_utsname |
401 | */ |
402 | |
403 | if (!ic_host_name_set) |
404 | sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr); |
405 | |
406 | if (root_server_addr == NONE) |
407 | root_server_addr = ic_servaddr; |
408 | |
409 | if (ic_netmask == NONE) { |
410 | if (IN_CLASSA(ntohl(ic_myaddr))) |
411 | ic_netmask = htonl(IN_CLASSA_NET); |
412 | else if (IN_CLASSB(ntohl(ic_myaddr))) |
413 | ic_netmask = htonl(IN_CLASSB_NET); |
414 | else if (IN_CLASSC(ntohl(ic_myaddr))) |
415 | ic_netmask = htonl(IN_CLASSC_NET); |
416 | else { |
417 | printk(KERN_ERR "IP-Config: Unable to guess netmask for address %pI4\n", |
418 | &ic_myaddr); |
419 | return -1; |
420 | } |
421 | printk("IP-Config: Guessing netmask %pI4\n", &ic_netmask); |
422 | } |
423 | |
424 | return 0; |
425 | } |
426 | |
427 | /* |
428 | * RARP support. |
429 | */ |
430 | |
431 | #ifdef IPCONFIG_RARP |
432 | |
433 | static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); |
434 | |
435 | static struct packet_type rarp_packet_type __initdata = { |
436 | .type = cpu_to_be16(ETH_P_RARP), |
437 | .func = ic_rarp_recv, |
438 | }; |
439 | |
440 | static inline void __init ic_rarp_init(void) |
441 | { |
442 | dev_add_pack(&rarp_packet_type); |
443 | } |
444 | |
445 | static inline void __init ic_rarp_cleanup(void) |
446 | { |
447 | dev_remove_pack(&rarp_packet_type); |
448 | } |
449 | |
450 | /* |
451 | * Process received RARP packet. |
452 | */ |
453 | static int __init |
454 | ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
455 | { |
456 | struct arphdr *rarp; |
457 | unsigned char *rarp_ptr; |
458 | __be32 sip, tip; |
459 | unsigned char *sha, *tha; /* s for "source", t for "target" */ |
460 | struct ic_device *d; |
461 | |
462 | if (!net_eq(dev_net(dev), &init_net)) |
463 | goto drop; |
464 | |
465 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
466 | return NET_RX_DROP; |
467 | |
468 | if (!pskb_may_pull(skb, sizeof(struct arphdr))) |
469 | goto drop; |
470 | |
471 | /* Basic sanity checks can be done without the lock. */ |
472 | rarp = (struct arphdr *)skb_transport_header(skb); |
473 | |
474 | /* If this test doesn't pass, it's not IP, or we should |
475 | * ignore it anyway. |
476 | */ |
477 | if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd)) |
478 | goto drop; |
479 | |
480 | /* If it's not a RARP reply, delete it. */ |
481 | if (rarp->ar_op != htons(ARPOP_RREPLY)) |
482 | goto drop; |
483 | |
484 | /* If it's not Ethernet, delete it. */ |
485 | if (rarp->ar_pro != htons(ETH_P_IP)) |
486 | goto drop; |
487 | |
488 | if (!pskb_may_pull(skb, arp_hdr_len(dev))) |
489 | goto drop; |
490 | |
491 | /* OK, it is all there and looks valid, process... */ |
492 | rarp = (struct arphdr *)skb_transport_header(skb); |
493 | rarp_ptr = (unsigned char *) (rarp + 1); |
494 | |
495 | /* One reply at a time, please. */ |
496 | spin_lock(&ic_recv_lock); |
497 | |
498 | /* If we already have a reply, just drop the packet */ |
499 | if (ic_got_reply) |
500 | goto drop_unlock; |
501 | |
502 | /* Find the ic_device that the packet arrived on */ |
503 | d = ic_first_dev; |
504 | while (d && d->dev != dev) |
505 | d = d->next; |
506 | if (!d) |
507 | goto drop_unlock; /* should never happen */ |
508 | |
509 | /* Extract variable-width fields */ |
510 | sha = rarp_ptr; |
511 | rarp_ptr += dev->addr_len; |
512 | memcpy(&sip, rarp_ptr, 4); |
513 | rarp_ptr += 4; |
514 | tha = rarp_ptr; |
515 | rarp_ptr += dev->addr_len; |
516 | memcpy(&tip, rarp_ptr, 4); |
517 | |
518 | /* Discard packets which are not meant for us. */ |
519 | if (memcmp(tha, dev->dev_addr, dev->addr_len)) |
520 | goto drop_unlock; |
521 | |
522 | /* Discard packets which are not from specified server. */ |
523 | if (ic_servaddr != NONE && ic_servaddr != sip) |
524 | goto drop_unlock; |
525 | |
526 | /* We have a winner! */ |
527 | ic_dev = dev; |
528 | if (ic_myaddr == NONE) |
529 | ic_myaddr = tip; |
530 | ic_servaddr = sip; |
531 | ic_got_reply = IC_RARP; |
532 | |
533 | drop_unlock: |
534 | /* Show's over. Nothing to see here. */ |
535 | spin_unlock(&ic_recv_lock); |
536 | |
537 | drop: |
538 | /* Throw the packet out. */ |
539 | kfree_skb(skb); |
540 | return 0; |
541 | } |
542 | |
543 | |
544 | /* |
545 | * Send RARP request packet over a single interface. |
546 | */ |
547 | static void __init ic_rarp_send_if(struct ic_device *d) |
548 | { |
549 | struct net_device *dev = d->dev; |
550 | arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL, |
551 | dev->dev_addr, dev->dev_addr); |
552 | } |
553 | #endif |
554 | |
555 | /* |
556 | * DHCP/BOOTP support. |
557 | */ |
558 | |
559 | #ifdef IPCONFIG_BOOTP |
560 | |
561 | struct bootp_pkt { /* BOOTP packet format */ |
562 | struct iphdr iph; /* IP header */ |
563 | struct udphdr udph; /* UDP header */ |
564 | u8 op; /* 1=request, 2=reply */ |
565 | u8 htype; /* HW address type */ |
566 | u8 hlen; /* HW address length */ |
567 | u8 hops; /* Used only by gateways */ |
568 | __be32 xid; /* Transaction ID */ |
569 | __be16 secs; /* Seconds since we started */ |
570 | __be16 flags; /* Just what it says */ |
571 | __be32 client_ip; /* Client's IP address if known */ |
572 | __be32 your_ip; /* Assigned IP address */ |
573 | __be32 server_ip; /* (Next, e.g. NFS) Server's IP address */ |
574 | __be32 relay_ip; /* IP address of BOOTP relay */ |
575 | u8 hw_addr[16]; /* Client's HW address */ |
576 | u8 serv_name[64]; /* Server host name */ |
577 | u8 boot_file[128]; /* Name of boot file */ |
578 | u8 exten[312]; /* DHCP options / BOOTP vendor extensions */ |
579 | }; |
580 | |
581 | /* packet ops */ |
582 | #define BOOTP_REQUEST 1 |
583 | #define BOOTP_REPLY 2 |
584 | |
585 | /* DHCP message types */ |
586 | #define DHCPDISCOVER 1 |
587 | #define DHCPOFFER 2 |
588 | #define DHCPREQUEST 3 |
589 | #define DHCPDECLINE 4 |
590 | #define DHCPACK 5 |
591 | #define DHCPNAK 6 |
592 | #define DHCPRELEASE 7 |
593 | #define DHCPINFORM 8 |
594 | |
595 | static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); |
596 | |
597 | static struct packet_type bootp_packet_type __initdata = { |
598 | .type = cpu_to_be16(ETH_P_IP), |
599 | .func = ic_bootp_recv, |
600 | }; |
601 | |
602 | |
603 | /* |
604 | * Initialize DHCP/BOOTP extension fields in the request. |
605 | */ |
606 | |
607 | static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 }; |
608 | |
609 | #ifdef IPCONFIG_DHCP |
610 | |
611 | static void __init |
612 | ic_dhcp_init_options(u8 *options) |
613 | { |
614 | u8 mt = ((ic_servaddr == NONE) |
615 | ? DHCPDISCOVER : DHCPREQUEST); |
616 | u8 *e = options; |
617 | int len; |
618 | |
619 | #ifdef IPCONFIG_DEBUG |
620 | printk("DHCP: Sending message type %d\n", mt); |
621 | #endif |
622 | |
623 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ |
624 | e += 4; |
625 | |
626 | *e++ = 53; /* DHCP message type */ |
627 | *e++ = 1; |
628 | *e++ = mt; |
629 | |
630 | if (mt == DHCPREQUEST) { |
631 | *e++ = 54; /* Server ID (IP address) */ |
632 | *e++ = 4; |
633 | memcpy(e, &ic_servaddr, 4); |
634 | e += 4; |
635 | |
636 | *e++ = 50; /* Requested IP address */ |
637 | *e++ = 4; |
638 | memcpy(e, &ic_myaddr, 4); |
639 | e += 4; |
640 | } |
641 | |
642 | /* always? */ |
643 | { |
644 | static const u8 ic_req_params[] = { |
645 | 1, /* Subnet mask */ |
646 | 3, /* Default gateway */ |
647 | 6, /* DNS server */ |
648 | 12, /* Host name */ |
649 | 15, /* Domain name */ |
650 | 17, /* Boot path */ |
651 | 26, /* MTU */ |
652 | 40, /* NIS domain name */ |
653 | }; |
654 | |
655 | *e++ = 55; /* Parameter request list */ |
656 | *e++ = sizeof(ic_req_params); |
657 | memcpy(e, ic_req_params, sizeof(ic_req_params)); |
658 | e += sizeof(ic_req_params); |
659 | |
660 | if (*vendor_class_identifier) { |
661 | printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n", |
662 | vendor_class_identifier); |
663 | *e++ = 60; /* Class-identifier */ |
664 | len = strlen(vendor_class_identifier); |
665 | *e++ = len; |
666 | memcpy(e, vendor_class_identifier, len); |
667 | e += len; |
668 | } |
669 | } |
670 | |
671 | *e++ = 255; /* End of the list */ |
672 | } |
673 | |
674 | #endif /* IPCONFIG_DHCP */ |
675 | |
676 | static void __init ic_bootp_init_ext(u8 *e) |
677 | { |
678 | memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */ |
679 | e += 4; |
680 | *e++ = 1; /* Subnet mask request */ |
681 | *e++ = 4; |
682 | e += 4; |
683 | *e++ = 3; /* Default gateway request */ |
684 | *e++ = 4; |
685 | e += 4; |
686 | *e++ = 5; /* Name server request */ |
687 | *e++ = 8; |
688 | e += 8; |
689 | *e++ = 12; /* Host name request */ |
690 | *e++ = 32; |
691 | e += 32; |
692 | *e++ = 40; /* NIS Domain name request */ |
693 | *e++ = 32; |
694 | e += 32; |
695 | *e++ = 17; /* Boot path */ |
696 | *e++ = 40; |
697 | e += 40; |
698 | |
699 | *e++ = 57; /* set extension buffer size for reply */ |
700 | *e++ = 2; |
701 | *e++ = 1; /* 128+236+8+20+14, see dhcpd sources */ |
702 | *e++ = 150; |
703 | |
704 | *e++ = 255; /* End of the list */ |
705 | } |
706 | |
707 | |
708 | /* |
709 | * Initialize the DHCP/BOOTP mechanism. |
710 | */ |
711 | static inline void __init ic_bootp_init(void) |
712 | { |
713 | int i; |
714 | |
715 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) |
716 | ic_nameservers[i] = NONE; |
717 | |
718 | dev_add_pack(&bootp_packet_type); |
719 | } |
720 | |
721 | |
722 | /* |
723 | * DHCP/BOOTP cleanup. |
724 | */ |
725 | static inline void __init ic_bootp_cleanup(void) |
726 | { |
727 | dev_remove_pack(&bootp_packet_type); |
728 | } |
729 | |
730 | |
731 | /* |
732 | * Send DHCP/BOOTP request to single interface. |
733 | */ |
734 | static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff) |
735 | { |
736 | struct net_device *dev = d->dev; |
737 | struct sk_buff *skb; |
738 | struct bootp_pkt *b; |
739 | struct iphdr *h; |
740 | |
741 | /* Allocate packet */ |
742 | skb = alloc_skb(sizeof(struct bootp_pkt) + LL_ALLOCATED_SPACE(dev) + 15, |
743 | GFP_KERNEL); |
744 | if (!skb) |
745 | return; |
746 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
747 | b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt)); |
748 | memset(b, 0, sizeof(struct bootp_pkt)); |
749 | |
750 | /* Construct IP header */ |
751 | skb_reset_network_header(skb); |
752 | h = ip_hdr(skb); |
753 | h->version = 4; |
754 | h->ihl = 5; |
755 | h->tot_len = htons(sizeof(struct bootp_pkt)); |
756 | h->frag_off = htons(IP_DF); |
757 | h->ttl = 64; |
758 | h->protocol = IPPROTO_UDP; |
759 | h->daddr = htonl(INADDR_BROADCAST); |
760 | h->check = ip_fast_csum((unsigned char *) h, h->ihl); |
761 | |
762 | /* Construct UDP header */ |
763 | b->udph.source = htons(68); |
764 | b->udph.dest = htons(67); |
765 | b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr)); |
766 | /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */ |
767 | |
768 | /* Construct DHCP/BOOTP header */ |
769 | b->op = BOOTP_REQUEST; |
770 | if (dev->type < 256) /* check for false types */ |
771 | b->htype = dev->type; |
772 | else if (dev->type == ARPHRD_IEEE802_TR) /* fix for token ring */ |
773 | b->htype = ARPHRD_IEEE802; |
774 | else if (dev->type == ARPHRD_FDDI) |
775 | b->htype = ARPHRD_ETHER; |
776 | else { |
777 | printk("Unknown ARP type 0x%04x for device %s\n", dev->type, dev->name); |
778 | b->htype = dev->type; /* can cause undefined behavior */ |
779 | } |
780 | |
781 | /* server_ip and your_ip address are both already zero per RFC2131 */ |
782 | b->hlen = dev->addr_len; |
783 | memcpy(b->hw_addr, dev->dev_addr, dev->addr_len); |
784 | b->secs = htons(jiffies_diff / HZ); |
785 | b->xid = d->xid; |
786 | |
787 | /* add DHCP options or BOOTP extensions */ |
788 | #ifdef IPCONFIG_DHCP |
789 | if (ic_proto_enabled & IC_USE_DHCP) |
790 | ic_dhcp_init_options(b->exten); |
791 | else |
792 | #endif |
793 | ic_bootp_init_ext(b->exten); |
794 | |
795 | /* Chain packet down the line... */ |
796 | skb->dev = dev; |
797 | skb->protocol = htons(ETH_P_IP); |
798 | if (dev_hard_header(skb, dev, ntohs(skb->protocol), |
799 | dev->broadcast, dev->dev_addr, skb->len) < 0 || |
800 | dev_queue_xmit(skb) < 0) |
801 | printk("E"); |
802 | } |
803 | |
804 | |
805 | /* |
806 | * Copy BOOTP-supplied string if not already set. |
807 | */ |
808 | static int __init ic_bootp_string(char *dest, char *src, int len, int max) |
809 | { |
810 | if (!len) |
811 | return 0; |
812 | if (len > max-1) |
813 | len = max-1; |
814 | memcpy(dest, src, len); |
815 | dest[len] = '\0'; |
816 | return 1; |
817 | } |
818 | |
819 | |
820 | /* |
821 | * Process BOOTP extensions. |
822 | */ |
823 | static void __init ic_do_bootp_ext(u8 *ext) |
824 | { |
825 | u8 servers; |
826 | int i; |
827 | u16 mtu; |
828 | |
829 | #ifdef IPCONFIG_DEBUG |
830 | u8 *c; |
831 | |
832 | printk("DHCP/BOOTP: Got extension %d:",*ext); |
833 | for (c=ext+2; c<ext+2+ext[1]; c++) |
834 | printk(" %02x", *c); |
835 | printk("\n"); |
836 | #endif |
837 | |
838 | switch (*ext++) { |
839 | case 1: /* Subnet mask */ |
840 | if (ic_netmask == NONE) |
841 | memcpy(&ic_netmask, ext+1, 4); |
842 | break; |
843 | case 3: /* Default gateway */ |
844 | if (ic_gateway == NONE) |
845 | memcpy(&ic_gateway, ext+1, 4); |
846 | break; |
847 | case 6: /* DNS server */ |
848 | servers= *ext/4; |
849 | if (servers > CONF_NAMESERVERS_MAX) |
850 | servers = CONF_NAMESERVERS_MAX; |
851 | for (i = 0; i < servers; i++) { |
852 | if (ic_nameservers[i] == NONE) |
853 | memcpy(&ic_nameservers[i], ext+1+4*i, 4); |
854 | } |
855 | break; |
856 | case 12: /* Host name */ |
857 | ic_bootp_string(utsname()->nodename, ext+1, *ext, __NEW_UTS_LEN); |
858 | ic_host_name_set = 1; |
859 | break; |
860 | case 15: /* Domain name (DNS) */ |
861 | ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain)); |
862 | break; |
863 | case 17: /* Root path */ |
864 | if (!root_server_path[0]) |
865 | ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path)); |
866 | break; |
867 | case 26: /* Interface MTU */ |
868 | memcpy(&mtu, ext+1, sizeof(mtu)); |
869 | ic_dev_mtu = ntohs(mtu); |
870 | break; |
871 | case 40: /* NIS Domain name (_not_ DNS) */ |
872 | ic_bootp_string(utsname()->domainname, ext+1, *ext, __NEW_UTS_LEN); |
873 | break; |
874 | } |
875 | } |
876 | |
877 | |
878 | /* |
879 | * Receive BOOTP reply. |
880 | */ |
881 | static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
882 | { |
883 | struct bootp_pkt *b; |
884 | struct iphdr *h; |
885 | struct ic_device *d; |
886 | int len, ext_len; |
887 | |
888 | if (!net_eq(dev_net(dev), &init_net)) |
889 | goto drop; |
890 | |
891 | /* Perform verifications before taking the lock. */ |
892 | if (skb->pkt_type == PACKET_OTHERHOST) |
893 | goto drop; |
894 | |
895 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) |
896 | return NET_RX_DROP; |
897 | |
898 | if (!pskb_may_pull(skb, |
899 | sizeof(struct iphdr) + |
900 | sizeof(struct udphdr))) |
901 | goto drop; |
902 | |
903 | b = (struct bootp_pkt *)skb_network_header(skb); |
904 | h = &b->iph; |
905 | |
906 | if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP) |
907 | goto drop; |
908 | |
909 | /* Fragments are not supported */ |
910 | if (h->frag_off & htons(IP_OFFSET | IP_MF)) { |
911 | if (net_ratelimit()) |
912 | printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented " |
913 | "reply.\n"); |
914 | goto drop; |
915 | } |
916 | |
917 | if (skb->len < ntohs(h->tot_len)) |
918 | goto drop; |
919 | |
920 | if (ip_fast_csum((char *) h, h->ihl)) |
921 | goto drop; |
922 | |
923 | if (b->udph.source != htons(67) || b->udph.dest != htons(68)) |
924 | goto drop; |
925 | |
926 | if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr)) |
927 | goto drop; |
928 | |
929 | len = ntohs(b->udph.len) - sizeof(struct udphdr); |
930 | ext_len = len - (sizeof(*b) - |
931 | sizeof(struct iphdr) - |
932 | sizeof(struct udphdr) - |
933 | sizeof(b->exten)); |
934 | if (ext_len < 0) |
935 | goto drop; |
936 | |
937 | /* Ok the front looks good, make sure we can get at the rest. */ |
938 | if (!pskb_may_pull(skb, skb->len)) |
939 | goto drop; |
940 | |
941 | b = (struct bootp_pkt *)skb_network_header(skb); |
942 | h = &b->iph; |
943 | |
944 | /* One reply at a time, please. */ |
945 | spin_lock(&ic_recv_lock); |
946 | |
947 | /* If we already have a reply, just drop the packet */ |
948 | if (ic_got_reply) |
949 | goto drop_unlock; |
950 | |
951 | /* Find the ic_device that the packet arrived on */ |
952 | d = ic_first_dev; |
953 | while (d && d->dev != dev) |
954 | d = d->next; |
955 | if (!d) |
956 | goto drop_unlock; /* should never happen */ |
957 | |
958 | /* Is it a reply to our BOOTP request? */ |
959 | if (b->op != BOOTP_REPLY || |
960 | b->xid != d->xid) { |
961 | if (net_ratelimit()) |
962 | printk(KERN_ERR "DHCP/BOOTP: Reply not for us, " |
963 | "op[%x] xid[%x]\n", |
964 | b->op, b->xid); |
965 | goto drop_unlock; |
966 | } |
967 | |
968 | /* Is it a reply for the device we are configuring? */ |
969 | if (b->xid != ic_dev_xid) { |
970 | if (net_ratelimit()) |
971 | printk(KERN_ERR "DHCP/BOOTP: Ignoring delayed packet \n"); |
972 | goto drop_unlock; |
973 | } |
974 | |
975 | /* Parse extensions */ |
976 | if (ext_len >= 4 && |
977 | !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */ |
978 | u8 *end = (u8 *) b + ntohs(b->iph.tot_len); |
979 | u8 *ext; |
980 | |
981 | #ifdef IPCONFIG_DHCP |
982 | if (ic_proto_enabled & IC_USE_DHCP) { |
983 | __be32 server_id = NONE; |
984 | int mt = 0; |
985 | |
986 | ext = &b->exten[4]; |
987 | while (ext < end && *ext != 0xff) { |
988 | u8 *opt = ext++; |
989 | if (*opt == 0) /* Padding */ |
990 | continue; |
991 | ext += *ext + 1; |
992 | if (ext >= end) |
993 | break; |
994 | switch (*opt) { |
995 | case 53: /* Message type */ |
996 | if (opt[1]) |
997 | mt = opt[2]; |
998 | break; |
999 | case 54: /* Server ID (IP address) */ |
1000 | if (opt[1] >= 4) |
1001 | memcpy(&server_id, opt + 2, 4); |
1002 | break; |
1003 | } |
1004 | } |
1005 | |
1006 | #ifdef IPCONFIG_DEBUG |
1007 | printk("DHCP: Got message type %d\n", mt); |
1008 | #endif |
1009 | |
1010 | switch (mt) { |
1011 | case DHCPOFFER: |
1012 | /* While in the process of accepting one offer, |
1013 | * ignore all others. |
1014 | */ |
1015 | if (ic_myaddr != NONE) |
1016 | goto drop_unlock; |
1017 | |
1018 | /* Let's accept that offer. */ |
1019 | ic_myaddr = b->your_ip; |
1020 | ic_servaddr = server_id; |
1021 | #ifdef IPCONFIG_DEBUG |
1022 | printk("DHCP: Offered address %pI4 by server %pI4\n", |
1023 | &ic_myaddr, &ic_servaddr); |
1024 | #endif |
1025 | /* The DHCP indicated server address takes |
1026 | * precedence over the bootp header one if |
1027 | * they are different. |
1028 | */ |
1029 | if ((server_id != NONE) && |
1030 | (b->server_ip != server_id)) |
1031 | b->server_ip = ic_servaddr; |
1032 | break; |
1033 | |
1034 | case DHCPACK: |
1035 | if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0) |
1036 | goto drop_unlock; |
1037 | |
1038 | /* Yeah! */ |
1039 | break; |
1040 | |
1041 | default: |
1042 | /* Urque. Forget it*/ |
1043 | ic_myaddr = NONE; |
1044 | ic_servaddr = NONE; |
1045 | goto drop_unlock; |
1046 | } |
1047 | |
1048 | ic_dhcp_msgtype = mt; |
1049 | |
1050 | } |
1051 | #endif /* IPCONFIG_DHCP */ |
1052 | |
1053 | ext = &b->exten[4]; |
1054 | while (ext < end && *ext != 0xff) { |
1055 | u8 *opt = ext++; |
1056 | if (*opt == 0) /* Padding */ |
1057 | continue; |
1058 | ext += *ext + 1; |
1059 | if (ext < end) |
1060 | ic_do_bootp_ext(opt); |
1061 | } |
1062 | } |
1063 | |
1064 | /* We have a winner! */ |
1065 | ic_dev = dev; |
1066 | ic_myaddr = b->your_ip; |
1067 | ic_servaddr = b->server_ip; |
1068 | if (ic_gateway == NONE && b->relay_ip) |
1069 | ic_gateway = b->relay_ip; |
1070 | if (ic_nameservers[0] == NONE) |
1071 | ic_nameservers[0] = ic_servaddr; |
1072 | ic_got_reply = IC_BOOTP; |
1073 | |
1074 | drop_unlock: |
1075 | /* Show's over. Nothing to see here. */ |
1076 | spin_unlock(&ic_recv_lock); |
1077 | |
1078 | drop: |
1079 | /* Throw the packet out. */ |
1080 | kfree_skb(skb); |
1081 | |
1082 | return 0; |
1083 | } |
1084 | |
1085 | |
1086 | #endif |
1087 | |
1088 | |
1089 | /* |
1090 | * Dynamic IP configuration -- DHCP, BOOTP, RARP. |
1091 | */ |
1092 | |
1093 | #ifdef IPCONFIG_DYNAMIC |
1094 | |
1095 | static int __init ic_dynamic(void) |
1096 | { |
1097 | int retries; |
1098 | struct ic_device *d; |
1099 | unsigned long start_jiffies, timeout, jiff; |
1100 | int do_bootp = ic_proto_have_if & IC_BOOTP; |
1101 | int do_rarp = ic_proto_have_if & IC_RARP; |
1102 | |
1103 | /* |
1104 | * If none of DHCP/BOOTP/RARP was selected, return with an error. |
1105 | * This routine gets only called when some pieces of information |
1106 | * are missing, and without DHCP/BOOTP/RARP we are unable to get it. |
1107 | */ |
1108 | if (!ic_proto_enabled) { |
1109 | printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); |
1110 | return -1; |
1111 | } |
1112 | |
1113 | #ifdef IPCONFIG_BOOTP |
1114 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP) |
1115 | printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n"); |
1116 | #endif |
1117 | #ifdef IPCONFIG_RARP |
1118 | if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP) |
1119 | printk(KERN_ERR "RARP: No suitable device found.\n"); |
1120 | #endif |
1121 | |
1122 | if (!ic_proto_have_if) |
1123 | /* Error message already printed */ |
1124 | return -1; |
1125 | |
1126 | /* |
1127 | * Setup protocols |
1128 | */ |
1129 | #ifdef IPCONFIG_BOOTP |
1130 | if (do_bootp) |
1131 | ic_bootp_init(); |
1132 | #endif |
1133 | #ifdef IPCONFIG_RARP |
1134 | if (do_rarp) |
1135 | ic_rarp_init(); |
1136 | #endif |
1137 | |
1138 | /* |
1139 | * Send requests and wait, until we get an answer. This loop |
1140 | * seems to be a terrible waste of CPU time, but actually there is |
1141 | * only one process running at all, so we don't need to use any |
1142 | * scheduler functions. |
1143 | * [Actually we could now, but the nothing else running note still |
1144 | * applies.. - AC] |
1145 | */ |
1146 | printk(KERN_NOTICE "Sending %s%s%s requests .", |
1147 | do_bootp |
1148 | ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "", |
1149 | (do_bootp && do_rarp) ? " and " : "", |
1150 | do_rarp ? "RARP" : ""); |
1151 | |
1152 | start_jiffies = jiffies; |
1153 | d = ic_first_dev; |
1154 | retries = CONF_SEND_RETRIES; |
1155 | get_random_bytes(&timeout, sizeof(timeout)); |
1156 | timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM); |
1157 | for (;;) { |
1158 | /* Track the device we are configuring */ |
1159 | ic_dev_xid = d->xid; |
1160 | |
1161 | #ifdef IPCONFIG_BOOTP |
1162 | if (do_bootp && (d->able & IC_BOOTP)) |
1163 | ic_bootp_send_if(d, jiffies - start_jiffies); |
1164 | #endif |
1165 | #ifdef IPCONFIG_RARP |
1166 | if (do_rarp && (d->able & IC_RARP)) |
1167 | ic_rarp_send_if(d); |
1168 | #endif |
1169 | |
1170 | jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout); |
1171 | while (time_before(jiffies, jiff) && !ic_got_reply) |
1172 | schedule_timeout_uninterruptible(1); |
1173 | #ifdef IPCONFIG_DHCP |
1174 | /* DHCP isn't done until we get a DHCPACK. */ |
1175 | if ((ic_got_reply & IC_BOOTP) |
1176 | && (ic_proto_enabled & IC_USE_DHCP) |
1177 | && ic_dhcp_msgtype != DHCPACK) |
1178 | { |
1179 | ic_got_reply = 0; |
1180 | printk(","); |
1181 | continue; |
1182 | } |
1183 | #endif /* IPCONFIG_DHCP */ |
1184 | |
1185 | if (ic_got_reply) { |
1186 | printk(" OK\n"); |
1187 | break; |
1188 | } |
1189 | |
1190 | if ((d = d->next)) |
1191 | continue; |
1192 | |
1193 | if (! --retries) { |
1194 | printk(" timed out!\n"); |
1195 | break; |
1196 | } |
1197 | |
1198 | d = ic_first_dev; |
1199 | |
1200 | timeout = timeout CONF_TIMEOUT_MULT; |
1201 | if (timeout > CONF_TIMEOUT_MAX) |
1202 | timeout = CONF_TIMEOUT_MAX; |
1203 | |
1204 | printk("."); |
1205 | } |
1206 | |
1207 | #ifdef IPCONFIG_BOOTP |
1208 | if (do_bootp) |
1209 | ic_bootp_cleanup(); |
1210 | #endif |
1211 | #ifdef IPCONFIG_RARP |
1212 | if (do_rarp) |
1213 | ic_rarp_cleanup(); |
1214 | #endif |
1215 | |
1216 | if (!ic_got_reply) { |
1217 | ic_myaddr = NONE; |
1218 | return -1; |
1219 | } |
1220 | |
1221 | printk("IP-Config: Got %s answer from %pI4, ", |
1222 | ((ic_got_reply & IC_RARP) ? "RARP" |
1223 | : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"), |
1224 | &ic_servaddr); |
1225 | printk("my address is %pI4\n", &ic_myaddr); |
1226 | |
1227 | return 0; |
1228 | } |
1229 | |
1230 | #endif /* IPCONFIG_DYNAMIC */ |
1231 | |
1232 | #ifdef CONFIG_PROC_FS |
1233 | |
1234 | static int pnp_seq_show(struct seq_file *seq, void *v) |
1235 | { |
1236 | int i; |
1237 | |
1238 | if (ic_proto_used & IC_PROTO) |
1239 | seq_printf(seq, "#PROTO: %s\n", |
1240 | (ic_proto_used & IC_RARP) ? "RARP" |
1241 | : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP"); |
1242 | else |
1243 | seq_puts(seq, "#MANUAL\n"); |
1244 | |
1245 | if (ic_domain[0]) |
1246 | seq_printf(seq, |
1247 | "domain %s\n", ic_domain); |
1248 | for (i = 0; i < CONF_NAMESERVERS_MAX; i++) { |
1249 | if (ic_nameservers[i] != NONE) |
1250 | seq_printf(seq, "nameserver %pI4\n", |
1251 | &ic_nameservers[i]); |
1252 | } |
1253 | if (ic_servaddr != NONE) |
1254 | seq_printf(seq, "bootserver %pI4\n", |
1255 | &ic_servaddr); |
1256 | return 0; |
1257 | } |
1258 | |
1259 | static int pnp_seq_open(struct inode *indoe, struct file *file) |
1260 | { |
1261 | return single_open(file, pnp_seq_show, NULL); |
1262 | } |
1263 | |
1264 | static const struct file_operations pnp_seq_fops = { |
1265 | .owner = THIS_MODULE, |
1266 | .open = pnp_seq_open, |
1267 | .read = seq_read, |
1268 | .llseek = seq_lseek, |
1269 | .release = single_release, |
1270 | }; |
1271 | #endif /* CONFIG_PROC_FS */ |
1272 | |
1273 | /* |
1274 | * Extract IP address from the parameter string if needed. Note that we |
1275 | * need to have root_server_addr set _before_ IPConfig gets called as it |
1276 | * can override it. |
1277 | */ |
1278 | __be32 __init root_nfs_parse_addr(char *name) |
1279 | { |
1280 | __be32 addr; |
1281 | int octets = 0; |
1282 | char *cp, *cq; |
1283 | |
1284 | cp = cq = name; |
1285 | while (octets < 4) { |
1286 | while (*cp >= '0' && *cp <= '9') |
1287 | cp++; |
1288 | if (cp == cq || cp - cq > 3) |
1289 | break; |
1290 | if (*cp == '.' || octets == 3) |
1291 | octets++; |
1292 | if (octets < 4) |
1293 | cp++; |
1294 | cq = cp; |
1295 | } |
1296 | if (octets == 4 && (*cp == ':' || *cp == '\0')) { |
1297 | if (*cp == ':') |
1298 | *cp++ = '\0'; |
1299 | addr = in_aton(name); |
1300 | memmove(name, cp, strlen(cp) + 1); |
1301 | } else |
1302 | addr = NONE; |
1303 | |
1304 | return addr; |
1305 | } |
1306 | |
1307 | /* |
1308 | * IP Autoconfig dispatcher. |
1309 | */ |
1310 | |
1311 | static int __init ip_auto_config(void) |
1312 | { |
1313 | __be32 addr; |
1314 | #ifdef IPCONFIG_DYNAMIC |
1315 | int retries = CONF_OPEN_RETRIES; |
1316 | #endif |
1317 | |
1318 | #ifdef CONFIG_PROC_FS |
1319 | proc_net_fops_create(&init_net, "pnp", S_IRUGO, &pnp_seq_fops); |
1320 | #endif /* CONFIG_PROC_FS */ |
1321 | |
1322 | if (!ic_enable) |
1323 | return 0; |
1324 | |
1325 | DBG(("IP-Config: Entered.\n")); |
1326 | #ifdef IPCONFIG_DYNAMIC |
1327 | try_try_again: |
1328 | #endif |
1329 | /* Give hardware a chance to settle */ |
1330 | msleep(CONF_PRE_OPEN); |
1331 | |
1332 | /* Setup all network devices */ |
1333 | if (ic_open_devs() < 0) |
1334 | return -1; |
1335 | |
1336 | /* Give drivers a chance to settle */ |
1337 | ssleep(CONF_POST_OPEN); |
1338 | |
1339 | /* |
1340 | * If the config information is insufficient (e.g., our IP address or |
1341 | * IP address of the boot server is missing or we have multiple network |
1342 | * interfaces and no default was set), use BOOTP or RARP to get the |
1343 | * missing values. |
1344 | */ |
1345 | if (ic_myaddr == NONE || |
1346 | #ifdef CONFIG_ROOT_NFS |
1347 | (root_server_addr == NONE |
1348 | && ic_servaddr == NONE |
1349 | && ROOT_DEV == Root_NFS) || |
1350 | #endif |
1351 | ic_first_dev->next) { |
1352 | #ifdef IPCONFIG_DYNAMIC |
1353 | if (ic_dynamic() < 0) { |
1354 | ic_close_devs(); |
1355 | |
1356 | /* |
1357 | * I don't know why, but sometimes the |
1358 | * eepro100 driver (at least) gets upset and |
1359 | * doesn't work the first time it's opened. |
1360 | * But then if you close it and reopen it, it |
1361 | * works just fine. So we need to try that at |
1362 | * least once before giving up. |
1363 | * |
1364 | * Also, if the root will be NFS-mounted, we |
1365 | * have nowhere to go if DHCP fails. So we |
1366 | * just have to keep trying forever. |
1367 | * |
1368 | * -- Chip |
1369 | */ |
1370 | #ifdef CONFIG_ROOT_NFS |
1371 | if (ROOT_DEV == Root_NFS) { |
1372 | printk(KERN_ERR |
1373 | "IP-Config: Retrying forever (NFS root)...\n"); |
1374 | goto try_try_again; |
1375 | } |
1376 | #endif |
1377 | |
1378 | if (--retries) { |
1379 | printk(KERN_ERR |
1380 | "IP-Config: Reopening network devices...\n"); |
1381 | goto try_try_again; |
1382 | } |
1383 | |
1384 | /* Oh, well. At least we tried. */ |
1385 | printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n"); |
1386 | return -1; |
1387 | } |
1388 | #else /* !DYNAMIC */ |
1389 | printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n"); |
1390 | ic_close_devs(); |
1391 | return -1; |
1392 | #endif /* IPCONFIG_DYNAMIC */ |
1393 | } else { |
1394 | /* Device selected manually or only one device -> use it */ |
1395 | ic_dev = ic_first_dev->dev; |
1396 | } |
1397 | |
1398 | addr = root_nfs_parse_addr(root_server_path); |
1399 | if (root_server_addr == NONE) |
1400 | root_server_addr = addr; |
1401 | |
1402 | /* |
1403 | * Use defaults whereever applicable. |
1404 | */ |
1405 | if (ic_defaults() < 0) |
1406 | return -1; |
1407 | |
1408 | /* |
1409 | * Close all network devices except the device we've |
1410 | * autoconfigured and set up routes. |
1411 | */ |
1412 | ic_close_devs(); |
1413 | if (ic_setup_if() < 0 || ic_setup_routes() < 0) |
1414 | return -1; |
1415 | |
1416 | /* |
1417 | * Record which protocol was actually used. |
1418 | */ |
1419 | #ifdef IPCONFIG_DYNAMIC |
1420 | ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP); |
1421 | #endif |
1422 | |
1423 | #ifndef IPCONFIG_SILENT |
1424 | /* |
1425 | * Clue in the operator. |
1426 | */ |
1427 | printk("IP-Config: Complete:"); |
1428 | printk("\n device=%s", ic_dev->name); |
1429 | printk(", addr=%pI4", &ic_myaddr); |
1430 | printk(", mask=%pI4", &ic_netmask); |
1431 | printk(", gw=%pI4", &ic_gateway); |
1432 | printk(",\n host=%s, domain=%s, nis-domain=%s", |
1433 | utsname()->nodename, ic_domain, utsname()->domainname); |
1434 | printk(",\n bootserver=%pI4", &ic_servaddr); |
1435 | printk(", rootserver=%pI4", &root_server_addr); |
1436 | printk(", rootpath=%s", root_server_path); |
1437 | if (ic_dev_mtu) |
1438 | printk(", mtu=%d", ic_dev_mtu); |
1439 | printk("\n"); |
1440 | #endif /* !SILENT */ |
1441 | |
1442 | return 0; |
1443 | } |
1444 | |
1445 | late_initcall(ip_auto_config); |
1446 | |
1447 | |
1448 | /* |
1449 | * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel |
1450 | * command line parameter. See Documentation/filesystems/nfsroot.txt. |
1451 | */ |
1452 | static int __init ic_proto_name(char *name) |
1453 | { |
1454 | if (!strcmp(name, "on") || !strcmp(name, "any")) { |
1455 | return 1; |
1456 | } |
1457 | if (!strcmp(name, "off") || !strcmp(name, "none")) { |
1458 | return 0; |
1459 | } |
1460 | #ifdef CONFIG_IP_PNP_DHCP |
1461 | else if (!strcmp(name, "dhcp")) { |
1462 | ic_proto_enabled &= ~IC_RARP; |
1463 | return 1; |
1464 | } |
1465 | #endif |
1466 | #ifdef CONFIG_IP_PNP_BOOTP |
1467 | else if (!strcmp(name, "bootp")) { |
1468 | ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP); |
1469 | return 1; |
1470 | } |
1471 | #endif |
1472 | #ifdef CONFIG_IP_PNP_RARP |
1473 | else if (!strcmp(name, "rarp")) { |
1474 | ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP); |
1475 | return 1; |
1476 | } |
1477 | #endif |
1478 | #ifdef IPCONFIG_DYNAMIC |
1479 | else if (!strcmp(name, "both")) { |
1480 | ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */ |
1481 | return 1; |
1482 | } |
1483 | #endif |
1484 | return 0; |
1485 | } |
1486 | |
1487 | static int __init ip_auto_config_setup(char *addrs) |
1488 | { |
1489 | char *cp, *ip, *dp; |
1490 | int num = 0; |
1491 | |
1492 | ic_set_manually = 1; |
1493 | ic_enable = 1; |
1494 | |
1495 | /* |
1496 | * If any dhcp, bootp etc options are set, leave autoconfig on |
1497 | * and skip the below static IP processing. |
1498 | */ |
1499 | if (ic_proto_name(addrs)) |
1500 | return 1; |
1501 | |
1502 | /* If no static IP is given, turn off autoconfig and bail. */ |
1503 | if (*addrs == 0 || |
1504 | strcmp(addrs, "off") == 0 || |
1505 | strcmp(addrs, "none") == 0) { |
1506 | ic_enable = 0; |
1507 | return 1; |
1508 | } |
1509 | |
1510 | /* Parse string for static IP assignment. */ |
1511 | ip = addrs; |
1512 | while (ip && *ip) { |
1513 | if ((cp = strchr(ip, ':'))) |
1514 | *cp++ = '\0'; |
1515 | if (strlen(ip) > 0) { |
1516 | DBG(("IP-Config: Parameter #%d: `%s'\n", num, ip)); |
1517 | switch (num) { |
1518 | case 0: |
1519 | if ((ic_myaddr = in_aton(ip)) == ANY) |
1520 | ic_myaddr = NONE; |
1521 | break; |
1522 | case 1: |
1523 | if ((ic_servaddr = in_aton(ip)) == ANY) |
1524 | ic_servaddr = NONE; |
1525 | break; |
1526 | case 2: |
1527 | if ((ic_gateway = in_aton(ip)) == ANY) |
1528 | ic_gateway = NONE; |
1529 | break; |
1530 | case 3: |
1531 | if ((ic_netmask = in_aton(ip)) == ANY) |
1532 | ic_netmask = NONE; |
1533 | break; |
1534 | case 4: |
1535 | if ((dp = strchr(ip, '.'))) { |
1536 | *dp++ = '\0'; |
1537 | strlcpy(utsname()->domainname, dp, |
1538 | sizeof(utsname()->domainname)); |
1539 | } |
1540 | strlcpy(utsname()->nodename, ip, |
1541 | sizeof(utsname()->nodename)); |
1542 | ic_host_name_set = 1; |
1543 | break; |
1544 | case 5: |
1545 | strlcpy(user_dev_name, ip, sizeof(user_dev_name)); |
1546 | break; |
1547 | case 6: |
1548 | if (ic_proto_name(ip) == 0 && |
1549 | ic_myaddr == NONE) { |
1550 | ic_enable = 0; |
1551 | } |
1552 | break; |
1553 | } |
1554 | } |
1555 | ip = cp; |
1556 | num++; |
1557 | } |
1558 | |
1559 | return 1; |
1560 | } |
1561 | |
1562 | static int __init nfsaddrs_config_setup(char *addrs) |
1563 | { |
1564 | return ip_auto_config_setup(addrs); |
1565 | } |
1566 | |
1567 | static int __init vendor_class_identifier_setup(char *addrs) |
1568 | { |
1569 | if (strlcpy(vendor_class_identifier, addrs, |
1570 | sizeof(vendor_class_identifier)) |
1571 | >= sizeof(vendor_class_identifier)) |
1572 | printk(KERN_WARNING "DHCP: vendorclass too long, truncated to \"%s\"", |
1573 | vendor_class_identifier); |
1574 | return 1; |
1575 | } |
1576 | |
1577 | __setup("ip=", ip_auto_config_setup); |
1578 | __setup("nfsaddrs=", nfsaddrs_config_setup); |
1579 | __setup("dhcpclass=", vendor_class_identifier_setup); |
1580 |
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