2 * $Id: ipconfig.c,v 1.46 2002/02/01 22:01:04 davem Exp $
4 * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
5 * user-supplied information to configure own IP address and routes.
7 * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
9 * Derived from network configuration code in fs/nfs/nfsroot.c,
10 * originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
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
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
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
24 * Ported DHCP support from 2.2.16 to 2.4.0-test4
25 * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
27 * Merged changes from 2.2.19 into 2.4.3
28 * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
30 * Multiple Nameservers in /proc/net/pnp
31 * -- Josef Siemes <jsiemes@web.de>, Aug 2002
34 #include <linux/types.h>
35 #include <linux/string.h>
36 #include <linux/kernel.h>
37 #include <linux/jiffies.h>
38 #include <linux/random.h>
39 #include <linux/init.h>
40 #include <linux/utsname.h>
43 #include <linux/inet.h>
44 #include <linux/inetdevice.h>
45 #include <linux/netdevice.h>
46 #include <linux/if_arp.h>
47 #include <linux/skbuff.h>
49 #include <linux/socket.h>
50 #include <linux/route.h>
51 #include <linux/udp.h>
52 #include <linux/proc_fs.h>
53 #include <linux/seq_file.h>
54 #include <linux/major.h>
55 #include <linux/root_dev.h>
56 #include <linux/delay.h>
57 #include <linux/nfs_fs.h>
58 #include <net/net_namespace.h>
61 #include <net/ipconfig.h>
62 #include <net/route.h>
64 #include <asm/uaccess.h>
65 #include <net/checksum.h>
66 #include <asm/processor.h>
68 /* Define this to allow debugging output */
72 #define DBG(x) printk x
74 #define DBG(x) do { } while(0)
77 #if defined(CONFIG_IP_PNP_DHCP)
80 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
81 #define IPCONFIG_BOOTP
83 #if defined(CONFIG_IP_PNP_RARP)
86 #if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
87 #define IPCONFIG_DYNAMIC
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 */
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 */
105 #define NONE __constant_htonl(INADDR_NONE)
108 * Public IP configuration
111 /* This is used by platforms which might be able to set the ipconfig
112 * variables using firmware environment vars. If this is set, it will
113 * ignore such firmware variables.
115 int ic_set_manually __initdata
= 0; /* IPconfig parameters set manually */
117 static int ic_enable __initdata
= 0; /* IP config enabled? */
119 /* Protocol choice */
120 int ic_proto_enabled __initdata
= 0
121 #ifdef IPCONFIG_BOOTP
124 #ifdef CONFIG_IP_PNP_DHCP
132 static int ic_host_name_set __initdata
= 0; /* Host name set by us? */
134 __be32 ic_myaddr
= NONE
; /* My IP address */
135 static __be32 ic_netmask
= NONE
; /* Netmask for local subnet */
136 __be32 ic_gateway
= NONE
; /* Gateway IP address */
138 __be32 ic_servaddr
= NONE
; /* Boot server IP address */
140 __be32 root_server_addr
= NONE
; /* Address of NFS server */
141 u8 root_server_path
[256] = { 0, }; /* Path to mount as root */
143 /* Persistent data: */
145 static int ic_proto_used
; /* Protocol used, if any */
146 static __be32 ic_nameservers
[CONF_NAMESERVERS_MAX
]; /* DNS Server IP addresses */
147 static u8 ic_domain
[64]; /* DNS (not NIS) domain name */
153 /* Name of user-selected boot device */
154 static char user_dev_name
[IFNAMSIZ
] __initdata
= { 0, };
156 /* Protocols supported by available interfaces */
157 static int ic_proto_have_if __initdata
= 0;
159 #ifdef IPCONFIG_DYNAMIC
160 static DEFINE_SPINLOCK(ic_recv_lock
);
161 static volatile int ic_got_reply __initdata
= 0; /* Proto(s) that replied */
164 static int ic_dhcp_msgtype __initdata
= 0; /* DHCP msg type received */
173 struct ic_device
*next
;
174 struct net_device
*dev
;
175 unsigned short flags
;
180 static struct ic_device
*ic_first_dev __initdata
= NULL
;/* List of open device */
181 static struct net_device
*ic_dev __initdata
= NULL
; /* Selected device */
183 static int __init
ic_open_devs(void)
185 struct ic_device
*d
, **last
;
186 struct net_device
*dev
;
187 unsigned short oflags
;
189 last
= &ic_first_dev
;
192 /* bring loopback device up first */
193 if (dev_change_flags(&loopback_dev
, loopback_dev
.flags
| IFF_UP
) < 0)
194 printk(KERN_ERR
"IP-Config: Failed to open %s\n", loopback_dev
.name
);
196 for_each_netdev(dev
) {
197 if (dev
== &loopback_dev
)
199 if (user_dev_name
[0] ? !strcmp(dev
->name
, user_dev_name
) :
200 (!(dev
->flags
& IFF_LOOPBACK
) &&
201 (dev
->flags
& (IFF_POINTOPOINT
|IFF_BROADCAST
)) &&
202 strncmp(dev
->name
, "dummy", 5))) {
207 printk(KERN_WARNING
"DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev
->name
, dev
->mtu
);
208 if (!(dev
->flags
& IFF_NOARP
))
210 able
&= ic_proto_enabled
;
211 if (ic_proto_enabled
&& !able
)
214 if (dev_change_flags(dev
, oflags
| IFF_UP
) < 0) {
215 printk(KERN_ERR
"IP-Config: Failed to open %s\n", dev
->name
);
218 if (!(d
= kmalloc(sizeof(struct ic_device
), GFP_KERNEL
))) {
228 get_random_bytes(&d
->xid
, sizeof(__be32
));
231 ic_proto_have_if
|= able
;
232 DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
233 dev
->name
, able
, d
->xid
));
241 if (user_dev_name
[0])
242 printk(KERN_ERR
"IP-Config: Device `%s' not found.\n", user_dev_name
);
244 printk(KERN_ERR
"IP-Config: No network devices available.\n");
250 static void __init
ic_close_devs(void)
252 struct ic_device
*d
, *next
;
253 struct net_device
*dev
;
261 DBG(("IP-Config: Downing %s\n", dev
->name
));
262 dev_change_flags(dev
, d
->flags
);
270 * Interface to various network functions.
274 set_sockaddr(struct sockaddr_in
*sin
, __be32 addr
, __be16 port
)
276 sin
->sin_family
= AF_INET
;
277 sin
->sin_addr
.s_addr
= addr
;
278 sin
->sin_port
= port
;
281 static int __init
ic_dev_ioctl(unsigned int cmd
, struct ifreq
*arg
)
285 mm_segment_t oldfs
= get_fs();
287 res
= devinet_ioctl(cmd
, (struct ifreq __user
*) arg
);
292 static int __init
ic_route_ioctl(unsigned int cmd
, struct rtentry
*arg
)
296 mm_segment_t oldfs
= get_fs();
298 res
= ip_rt_ioctl(cmd
, (void __user
*) arg
);
304 * Set up interface addresses and routes.
307 static int __init
ic_setup_if(void)
310 struct sockaddr_in
*sin
= (void *) &ir
.ifr_ifru
.ifru_addr
;
313 memset(&ir
, 0, sizeof(ir
));
314 strcpy(ir
.ifr_ifrn
.ifrn_name
, ic_dev
->name
);
315 set_sockaddr(sin
, ic_myaddr
, 0);
316 if ((err
= ic_dev_ioctl(SIOCSIFADDR
, &ir
)) < 0) {
317 printk(KERN_ERR
"IP-Config: Unable to set interface address (%d).\n", err
);
320 set_sockaddr(sin
, ic_netmask
, 0);
321 if ((err
= ic_dev_ioctl(SIOCSIFNETMASK
, &ir
)) < 0) {
322 printk(KERN_ERR
"IP-Config: Unable to set interface netmask (%d).\n", err
);
325 set_sockaddr(sin
, ic_myaddr
| ~ic_netmask
, 0);
326 if ((err
= ic_dev_ioctl(SIOCSIFBRDADDR
, &ir
)) < 0) {
327 printk(KERN_ERR
"IP-Config: Unable to set interface broadcast address (%d).\n", err
);
333 static int __init
ic_setup_routes(void)
335 /* No need to setup device routes, only the default route... */
337 if (ic_gateway
!= NONE
) {
341 memset(&rm
, 0, sizeof(rm
));
342 if ((ic_gateway
^ ic_myaddr
) & ic_netmask
) {
343 printk(KERN_ERR
"IP-Config: Gateway not on directly connected network.\n");
346 set_sockaddr((struct sockaddr_in
*) &rm
.rt_dst
, 0, 0);
347 set_sockaddr((struct sockaddr_in
*) &rm
.rt_genmask
, 0, 0);
348 set_sockaddr((struct sockaddr_in
*) &rm
.rt_gateway
, ic_gateway
, 0);
349 rm
.rt_flags
= RTF_UP
| RTF_GATEWAY
;
350 if ((err
= ic_route_ioctl(SIOCADDRT
, &rm
)) < 0) {
351 printk(KERN_ERR
"IP-Config: Cannot add default route (%d).\n", err
);
360 * Fill in default values for all missing parameters.
363 static int __init
ic_defaults(void)
366 * At this point we have no userspace running so need not
367 * claim locks on system_utsname
370 if (!ic_host_name_set
)
371 sprintf(init_utsname()->nodename
, "%u.%u.%u.%u", NIPQUAD(ic_myaddr
));
373 if (root_server_addr
== NONE
)
374 root_server_addr
= ic_servaddr
;
376 if (ic_netmask
== NONE
) {
377 if (IN_CLASSA(ntohl(ic_myaddr
)))
378 ic_netmask
= htonl(IN_CLASSA_NET
);
379 else if (IN_CLASSB(ntohl(ic_myaddr
)))
380 ic_netmask
= htonl(IN_CLASSB_NET
);
381 else if (IN_CLASSC(ntohl(ic_myaddr
)))
382 ic_netmask
= htonl(IN_CLASSC_NET
);
384 printk(KERN_ERR
"IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n",
388 printk("IP-Config: Guessing netmask %u.%u.%u.%u\n", NIPQUAD(ic_netmask
));
400 static int ic_rarp_recv(struct sk_buff
*skb
, struct net_device
*dev
, struct packet_type
*pt
, struct net_device
*orig_dev
);
402 static struct packet_type rarp_packet_type __initdata
= {
403 .type
= __constant_htons(ETH_P_RARP
),
404 .func
= ic_rarp_recv
,
407 static inline void ic_rarp_init(void)
409 dev_add_pack(&rarp_packet_type
);
412 static inline void ic_rarp_cleanup(void)
414 dev_remove_pack(&rarp_packet_type
);
418 * Process received RARP packet.
421 ic_rarp_recv(struct sk_buff
*skb
, struct net_device
*dev
, struct packet_type
*pt
, struct net_device
*orig_dev
)
424 unsigned char *rarp_ptr
;
426 unsigned char *sha
, *tha
; /* s for "source", t for "target" */
429 if (dev
->nd_net
!= &init_net
)
432 if ((skb
= skb_share_check(skb
, GFP_ATOMIC
)) == NULL
)
435 if (!pskb_may_pull(skb
, sizeof(struct arphdr
)))
438 /* Basic sanity checks can be done without the lock. */
439 rarp
= (struct arphdr
*)skb_transport_header(skb
);
441 /* If this test doesn't pass, it's not IP, or we should
444 if (rarp
->ar_hln
!= dev
->addr_len
|| dev
->type
!= ntohs(rarp
->ar_hrd
))
447 /* If it's not a RARP reply, delete it. */
448 if (rarp
->ar_op
!= htons(ARPOP_RREPLY
))
451 /* If it's not Ethernet, delete it. */
452 if (rarp
->ar_pro
!= htons(ETH_P_IP
))
455 if (!pskb_may_pull(skb
,
456 sizeof(struct arphdr
) +
457 (2 * dev
->addr_len
) +
461 /* OK, it is all there and looks valid, process... */
462 rarp
= (struct arphdr
*)skb_transport_header(skb
);
463 rarp_ptr
= (unsigned char *) (rarp
+ 1);
465 /* One reply at a time, please. */
466 spin_lock(&ic_recv_lock
);
468 /* If we already have a reply, just drop the packet */
472 /* Find the ic_device that the packet arrived on */
474 while (d
&& d
->dev
!= dev
)
477 goto drop_unlock
; /* should never happen */
479 /* Extract variable-width fields */
481 rarp_ptr
+= dev
->addr_len
;
482 memcpy(&sip
, rarp_ptr
, 4);
485 rarp_ptr
+= dev
->addr_len
;
486 memcpy(&tip
, rarp_ptr
, 4);
488 /* Discard packets which are not meant for us. */
489 if (memcmp(tha
, dev
->dev_addr
, dev
->addr_len
))
492 /* Discard packets which are not from specified server. */
493 if (ic_servaddr
!= NONE
&& ic_servaddr
!= sip
)
496 /* We have a winner! */
498 if (ic_myaddr
== NONE
)
501 ic_got_reply
= IC_RARP
;
504 /* Show's over. Nothing to see here. */
505 spin_unlock(&ic_recv_lock
);
508 /* Throw the packet out. */
515 * Send RARP request packet over a single interface.
517 static void __init
ic_rarp_send_if(struct ic_device
*d
)
519 struct net_device
*dev
= d
->dev
;
520 arp_send(ARPOP_RREQUEST
, ETH_P_RARP
, 0, dev
, 0, NULL
,
521 dev
->dev_addr
, dev
->dev_addr
);
526 * DHCP/BOOTP support.
529 #ifdef IPCONFIG_BOOTP
531 struct bootp_pkt
{ /* BOOTP packet format */
532 struct iphdr iph
; /* IP header */
533 struct udphdr udph
; /* UDP header */
534 u8 op
; /* 1=request, 2=reply */
535 u8 htype
; /* HW address type */
536 u8 hlen
; /* HW address length */
537 u8 hops
; /* Used only by gateways */
538 __be32 xid
; /* Transaction ID */
539 __be16 secs
; /* Seconds since we started */
540 __be16 flags
; /* Just what it says */
541 __be32 client_ip
; /* Client's IP address if known */
542 __be32 your_ip
; /* Assigned IP address */
543 __be32 server_ip
; /* (Next, e.g. NFS) Server's IP address */
544 __be32 relay_ip
; /* IP address of BOOTP relay */
545 u8 hw_addr
[16]; /* Client's HW address */
546 u8 serv_name
[64]; /* Server host name */
547 u8 boot_file
[128]; /* Name of boot file */
548 u8 exten
[312]; /* DHCP options / BOOTP vendor extensions */
552 #define BOOTP_REQUEST 1
553 #define BOOTP_REPLY 2
555 /* DHCP message types */
556 #define DHCPDISCOVER 1
558 #define DHCPREQUEST 3
559 #define DHCPDECLINE 4
562 #define DHCPRELEASE 7
565 static int ic_bootp_recv(struct sk_buff
*skb
, struct net_device
*dev
, struct packet_type
*pt
, struct net_device
*orig_dev
);
567 static struct packet_type bootp_packet_type __initdata
= {
568 .type
= __constant_htons(ETH_P_IP
),
569 .func
= ic_bootp_recv
,
574 * Initialize DHCP/BOOTP extension fields in the request.
577 static const u8 ic_bootp_cookie
[4] = { 99, 130, 83, 99 };
582 ic_dhcp_init_options(u8
*options
)
584 u8 mt
= ((ic_servaddr
== NONE
)
585 ? DHCPDISCOVER
: DHCPREQUEST
);
588 #ifdef IPCONFIG_DEBUG
589 printk("DHCP: Sending message type %d\n", mt
);
592 memcpy(e
, ic_bootp_cookie
, 4); /* RFC1048 Magic Cookie */
595 *e
++ = 53; /* DHCP message type */
599 if (mt
== DHCPREQUEST
) {
600 *e
++ = 54; /* Server ID (IP address) */
602 memcpy(e
, &ic_servaddr
, 4);
605 *e
++ = 50; /* Requested IP address */
607 memcpy(e
, &ic_myaddr
, 4);
613 static const u8 ic_req_params
[] = {
615 3, /* Default gateway */
618 15, /* Domain name */
620 40, /* NIS domain name */
623 *e
++ = 55; /* Parameter request list */
624 *e
++ = sizeof(ic_req_params
);
625 memcpy(e
, ic_req_params
, sizeof(ic_req_params
));
626 e
+= sizeof(ic_req_params
);
629 *e
++ = 255; /* End of the list */
632 #endif /* IPCONFIG_DHCP */
634 static void __init
ic_bootp_init_ext(u8
*e
)
636 memcpy(e
, ic_bootp_cookie
, 4); /* RFC1048 Magic Cookie */
638 *e
++ = 1; /* Subnet mask request */
641 *e
++ = 3; /* Default gateway request */
644 *e
++ = 5; /* Name server request */
647 *e
++ = 12; /* Host name request */
650 *e
++ = 40; /* NIS Domain name request */
653 *e
++ = 17; /* Boot path */
657 *e
++ = 57; /* set extension buffer size for reply */
659 *e
++ = 1; /* 128+236+8+20+14, see dhcpd sources */
662 *e
++ = 255; /* End of the list */
667 * Initialize the DHCP/BOOTP mechanism.
669 static inline void ic_bootp_init(void)
673 for (i
= 0; i
< CONF_NAMESERVERS_MAX
; i
++)
674 ic_nameservers
[i
] = NONE
;
676 dev_add_pack(&bootp_packet_type
);
681 * DHCP/BOOTP cleanup.
683 static inline void ic_bootp_cleanup(void)
685 dev_remove_pack(&bootp_packet_type
);
690 * Send DHCP/BOOTP request to single interface.
692 static void __init
ic_bootp_send_if(struct ic_device
*d
, unsigned long jiffies_diff
)
694 struct net_device
*dev
= d
->dev
;
697 int hh_len
= LL_RESERVED_SPACE(dev
);
700 /* Allocate packet */
701 skb
= alloc_skb(sizeof(struct bootp_pkt
) + hh_len
+ 15, GFP_KERNEL
);
704 skb_reserve(skb
, hh_len
);
705 b
= (struct bootp_pkt
*) skb_put(skb
, sizeof(struct bootp_pkt
));
706 memset(b
, 0, sizeof(struct bootp_pkt
));
708 /* Construct IP header */
709 skb_reset_network_header(skb
);
713 h
->tot_len
= htons(sizeof(struct bootp_pkt
));
714 h
->frag_off
= htons(IP_DF
);
716 h
->protocol
= IPPROTO_UDP
;
717 h
->daddr
= htonl(INADDR_BROADCAST
);
718 h
->check
= ip_fast_csum((unsigned char *) h
, h
->ihl
);
720 /* Construct UDP header */
721 b
->udph
.source
= htons(68);
722 b
->udph
.dest
= htons(67);
723 b
->udph
.len
= htons(sizeof(struct bootp_pkt
) - sizeof(struct iphdr
));
724 /* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
726 /* Construct DHCP/BOOTP header */
727 b
->op
= BOOTP_REQUEST
;
728 if (dev
->type
< 256) /* check for false types */
729 b
->htype
= dev
->type
;
730 else if (dev
->type
== ARPHRD_IEEE802_TR
) /* fix for token ring */
731 b
->htype
= ARPHRD_IEEE802
;
732 else if (dev
->type
== ARPHRD_FDDI
)
733 b
->htype
= ARPHRD_ETHER
;
735 printk("Unknown ARP type 0x%04x for device %s\n", dev
->type
, dev
->name
);
736 b
->htype
= dev
->type
; /* can cause undefined behavior */
738 b
->hlen
= dev
->addr_len
;
741 memcpy(b
->hw_addr
, dev
->dev_addr
, dev
->addr_len
);
742 b
->secs
= htons(jiffies_diff
/ HZ
);
745 /* add DHCP options or BOOTP extensions */
747 if (ic_proto_enabled
& IC_USE_DHCP
)
748 ic_dhcp_init_options(b
->exten
);
751 ic_bootp_init_ext(b
->exten
);
753 /* Chain packet down the line... */
755 skb
->protocol
= htons(ETH_P_IP
);
756 if ((dev
->hard_header
&&
757 dev
->hard_header(skb
, dev
, ntohs(skb
->protocol
), dev
->broadcast
, dev
->dev_addr
, skb
->len
) < 0) ||
758 dev_queue_xmit(skb
) < 0)
764 * Copy BOOTP-supplied string if not already set.
766 static int __init
ic_bootp_string(char *dest
, char *src
, int len
, int max
)
772 memcpy(dest
, src
, len
);
779 * Process BOOTP extensions.
781 static void __init
ic_do_bootp_ext(u8
*ext
)
786 #ifdef IPCONFIG_DEBUG
789 printk("DHCP/BOOTP: Got extension %d:",*ext
);
790 for (c
=ext
+2; c
<ext
+2+ext
[1]; c
++)
796 case 1: /* Subnet mask */
797 if (ic_netmask
== NONE
)
798 memcpy(&ic_netmask
, ext
+1, 4);
800 case 3: /* Default gateway */
801 if (ic_gateway
== NONE
)
802 memcpy(&ic_gateway
, ext
+1, 4);
804 case 6: /* DNS server */
806 if (servers
> CONF_NAMESERVERS_MAX
)
807 servers
= CONF_NAMESERVERS_MAX
;
808 for (i
= 0; i
< servers
; i
++) {
809 if (ic_nameservers
[i
] == NONE
)
810 memcpy(&ic_nameservers
[i
], ext
+1+4*i
, 4);
813 case 12: /* Host name */
814 ic_bootp_string(utsname()->nodename
, ext
+1, *ext
, __NEW_UTS_LEN
);
815 ic_host_name_set
= 1;
817 case 15: /* Domain name (DNS) */
818 ic_bootp_string(ic_domain
, ext
+1, *ext
, sizeof(ic_domain
));
820 case 17: /* Root path */
821 if (!root_server_path
[0])
822 ic_bootp_string(root_server_path
, ext
+1, *ext
, sizeof(root_server_path
));
824 case 40: /* NIS Domain name (_not_ DNS) */
825 ic_bootp_string(utsname()->domainname
, ext
+1, *ext
, __NEW_UTS_LEN
);
832 * Receive BOOTP reply.
834 static int __init
ic_bootp_recv(struct sk_buff
*skb
, struct net_device
*dev
, struct packet_type
*pt
, struct net_device
*orig_dev
)
841 if (dev
->nd_net
!= &init_net
)
844 /* Perform verifications before taking the lock. */
845 if (skb
->pkt_type
== PACKET_OTHERHOST
)
848 if ((skb
= skb_share_check(skb
, GFP_ATOMIC
)) == NULL
)
851 if (!pskb_may_pull(skb
,
852 sizeof(struct iphdr
) +
853 sizeof(struct udphdr
)))
856 b
= (struct bootp_pkt
*)skb_network_header(skb
);
859 if (h
->ihl
!= 5 || h
->version
!= 4 || h
->protocol
!= IPPROTO_UDP
)
862 /* Fragments are not supported */
863 if (h
->frag_off
& htons(IP_OFFSET
| IP_MF
)) {
865 printk(KERN_ERR
"DHCP/BOOTP: Ignoring fragmented "
870 if (skb
->len
< ntohs(h
->tot_len
))
873 if (ip_fast_csum((char *) h
, h
->ihl
))
876 if (b
->udph
.source
!= htons(67) || b
->udph
.dest
!= htons(68))
879 if (ntohs(h
->tot_len
) < ntohs(b
->udph
.len
) + sizeof(struct iphdr
))
882 len
= ntohs(b
->udph
.len
) - sizeof(struct udphdr
);
883 ext_len
= len
- (sizeof(*b
) -
884 sizeof(struct iphdr
) -
885 sizeof(struct udphdr
) -
890 /* Ok the front looks good, make sure we can get at the rest. */
891 if (!pskb_may_pull(skb
, skb
->len
))
894 b
= (struct bootp_pkt
*)skb_network_header(skb
);
897 /* One reply at a time, please. */
898 spin_lock(&ic_recv_lock
);
900 /* If we already have a reply, just drop the packet */
904 /* Find the ic_device that the packet arrived on */
906 while (d
&& d
->dev
!= dev
)
909 goto drop_unlock
; /* should never happen */
911 /* Is it a reply to our BOOTP request? */
912 if (b
->op
!= BOOTP_REPLY
||
915 printk(KERN_ERR
"DHCP/BOOTP: Reply not for us, "
921 /* Parse extensions */
923 !memcmp(b
->exten
, ic_bootp_cookie
, 4)) { /* Check magic cookie */
924 u8
*end
= (u8
*) b
+ ntohs(b
->iph
.tot_len
);
928 if (ic_proto_enabled
& IC_USE_DHCP
) {
929 __be32 server_id
= NONE
;
933 while (ext
< end
&& *ext
!= 0xff) {
935 if (*opt
== 0) /* Padding */
941 case 53: /* Message type */
945 case 54: /* Server ID (IP address) */
947 memcpy(&server_id
, opt
+ 2, 4);
952 #ifdef IPCONFIG_DEBUG
953 printk("DHCP: Got message type %d\n", mt
);
958 /* While in the process of accepting one offer,
961 if (ic_myaddr
!= NONE
)
964 /* Let's accept that offer. */
965 ic_myaddr
= b
->your_ip
;
966 ic_servaddr
= server_id
;
967 #ifdef IPCONFIG_DEBUG
968 printk("DHCP: Offered address %u.%u.%u.%u",
970 printk(" by server %u.%u.%u.%u\n",
971 NIPQUAD(ic_servaddr
));
973 /* The DHCP indicated server address takes
974 * precedence over the bootp header one if
975 * they are different.
977 if ((server_id
!= NONE
) &&
978 (b
->server_ip
!= server_id
))
979 b
->server_ip
= ic_servaddr
;
983 if (memcmp(dev
->dev_addr
, b
->hw_addr
, dev
->addr_len
) != 0)
990 /* Urque. Forget it*/
996 ic_dhcp_msgtype
= mt
;
999 #endif /* IPCONFIG_DHCP */
1002 while (ext
< end
&& *ext
!= 0xff) {
1004 if (*opt
== 0) /* Padding */
1008 ic_do_bootp_ext(opt
);
1012 /* We have a winner! */
1014 ic_myaddr
= b
->your_ip
;
1015 ic_servaddr
= b
->server_ip
;
1016 if (ic_gateway
== NONE
&& b
->relay_ip
)
1017 ic_gateway
= b
->relay_ip
;
1018 if (ic_nameservers
[0] == NONE
)
1019 ic_nameservers
[0] = ic_servaddr
;
1020 ic_got_reply
= IC_BOOTP
;
1023 /* Show's over. Nothing to see here. */
1024 spin_unlock(&ic_recv_lock
);
1027 /* Throw the packet out. */
1038 * Dynamic IP configuration -- DHCP, BOOTP, RARP.
1041 #ifdef IPCONFIG_DYNAMIC
1043 static int __init
ic_dynamic(void)
1046 struct ic_device
*d
;
1047 unsigned long start_jiffies
, timeout
, jiff
;
1048 int do_bootp
= ic_proto_have_if
& IC_BOOTP
;
1049 int do_rarp
= ic_proto_have_if
& IC_RARP
;
1052 * If none of DHCP/BOOTP/RARP was selected, return with an error.
1053 * This routine gets only called when some pieces of information
1054 * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
1056 if (!ic_proto_enabled
) {
1057 printk(KERN_ERR
"IP-Config: Incomplete network configuration information.\n");
1061 #ifdef IPCONFIG_BOOTP
1062 if ((ic_proto_enabled
^ ic_proto_have_if
) & IC_BOOTP
)
1063 printk(KERN_ERR
"DHCP/BOOTP: No suitable device found.\n");
1065 #ifdef IPCONFIG_RARP
1066 if ((ic_proto_enabled
^ ic_proto_have_if
) & IC_RARP
)
1067 printk(KERN_ERR
"RARP: No suitable device found.\n");
1070 if (!ic_proto_have_if
)
1071 /* Error message already printed */
1077 #ifdef IPCONFIG_BOOTP
1081 #ifdef IPCONFIG_RARP
1087 * Send requests and wait, until we get an answer. This loop
1088 * seems to be a terrible waste of CPU time, but actually there is
1089 * only one process running at all, so we don't need to use any
1090 * scheduler functions.
1091 * [Actually we could now, but the nothing else running note still
1094 printk(KERN_NOTICE
"Sending %s%s%s requests .",
1096 ? ((ic_proto_enabled
& IC_USE_DHCP
) ? "DHCP" : "BOOTP") : "",
1097 (do_bootp
&& do_rarp
) ? " and " : "",
1098 do_rarp
? "RARP" : "");
1100 start_jiffies
= jiffies
;
1102 retries
= CONF_SEND_RETRIES
;
1103 get_random_bytes(&timeout
, sizeof(timeout
));
1104 timeout
= CONF_BASE_TIMEOUT
+ (timeout
% (unsigned) CONF_TIMEOUT_RANDOM
);
1106 #ifdef IPCONFIG_BOOTP
1107 if (do_bootp
&& (d
->able
& IC_BOOTP
))
1108 ic_bootp_send_if(d
, jiffies
- start_jiffies
);
1110 #ifdef IPCONFIG_RARP
1111 if (do_rarp
&& (d
->able
& IC_RARP
))
1115 jiff
= jiffies
+ (d
->next
? CONF_INTER_TIMEOUT
: timeout
);
1116 while (time_before(jiffies
, jiff
) && !ic_got_reply
)
1117 schedule_timeout_uninterruptible(1);
1118 #ifdef IPCONFIG_DHCP
1119 /* DHCP isn't done until we get a DHCPACK. */
1120 if ((ic_got_reply
& IC_BOOTP
)
1121 && (ic_proto_enabled
& IC_USE_DHCP
)
1122 && ic_dhcp_msgtype
!= DHCPACK
)
1128 #endif /* IPCONFIG_DHCP */
1139 printk(" timed out!\n");
1145 timeout
= timeout CONF_TIMEOUT_MULT
;
1146 if (timeout
> CONF_TIMEOUT_MAX
)
1147 timeout
= CONF_TIMEOUT_MAX
;
1152 #ifdef IPCONFIG_BOOTP
1156 #ifdef IPCONFIG_RARP
1161 if (!ic_got_reply
) {
1166 printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
1167 ((ic_got_reply
& IC_RARP
) ? "RARP"
1168 : (ic_proto_enabled
& IC_USE_DHCP
) ? "DHCP" : "BOOTP"),
1169 NIPQUAD(ic_servaddr
));
1170 printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr
));
1175 #endif /* IPCONFIG_DYNAMIC */
1177 #ifdef CONFIG_PROC_FS
1179 static int pnp_seq_show(struct seq_file
*seq
, void *v
)
1183 if (ic_proto_used
& IC_PROTO
)
1184 seq_printf(seq
, "#PROTO: %s\n",
1185 (ic_proto_used
& IC_RARP
) ? "RARP"
1186 : (ic_proto_used
& IC_USE_DHCP
) ? "DHCP" : "BOOTP");
1188 seq_puts(seq
, "#MANUAL\n");
1192 "domain %s\n", ic_domain
);
1193 for (i
= 0; i
< CONF_NAMESERVERS_MAX
; i
++) {
1194 if (ic_nameservers
[i
] != NONE
)
1196 "nameserver %u.%u.%u.%u\n",
1197 NIPQUAD(ic_nameservers
[i
]));
1199 if (ic_servaddr
!= NONE
)
1201 "bootserver %u.%u.%u.%u\n",
1202 NIPQUAD(ic_servaddr
));
1206 static int pnp_seq_open(struct inode
*indoe
, struct file
*file
)
1208 return single_open(file
, pnp_seq_show
, NULL
);
1211 static const struct file_operations pnp_seq_fops
= {
1212 .owner
= THIS_MODULE
,
1213 .open
= pnp_seq_open
,
1215 .llseek
= seq_lseek
,
1216 .release
= single_release
,
1218 #endif /* CONFIG_PROC_FS */
1221 * Extract IP address from the parameter string if needed. Note that we
1222 * need to have root_server_addr set _before_ IPConfig gets called as it
1225 __be32 __init
root_nfs_parse_addr(char *name
)
1232 while (octets
< 4) {
1233 while (*cp
>= '0' && *cp
<= '9')
1235 if (cp
== cq
|| cp
- cq
> 3)
1237 if (*cp
== '.' || octets
== 3)
1243 if (octets
== 4 && (*cp
== ':' || *cp
== '\0')) {
1246 addr
= in_aton(name
);
1247 memmove(name
, cp
, strlen(cp
) + 1);
1255 * IP Autoconfig dispatcher.
1258 static int __init
ip_auto_config(void)
1262 #ifdef CONFIG_PROC_FS
1263 proc_net_fops_create(&init_net
, "pnp", S_IRUGO
, &pnp_seq_fops
);
1264 #endif /* CONFIG_PROC_FS */
1269 DBG(("IP-Config: Entered.\n"));
1270 #ifdef IPCONFIG_DYNAMIC
1273 /* Give hardware a chance to settle */
1274 msleep(CONF_PRE_OPEN
);
1276 /* Setup all network devices */
1277 if (ic_open_devs() < 0)
1280 /* Give drivers a chance to settle */
1281 ssleep(CONF_POST_OPEN
);
1284 * If the config information is insufficient (e.g., our IP address or
1285 * IP address of the boot server is missing or we have multiple network
1286 * interfaces and no default was set), use BOOTP or RARP to get the
1289 if (ic_myaddr
== NONE
||
1290 #ifdef CONFIG_ROOT_NFS
1291 (root_server_addr
== NONE
1292 && ic_servaddr
== NONE
1293 && ROOT_DEV
== Root_NFS
) ||
1295 ic_first_dev
->next
) {
1296 #ifdef IPCONFIG_DYNAMIC
1298 int retries
= CONF_OPEN_RETRIES
;
1300 if (ic_dynamic() < 0) {
1304 * I don't know why, but sometimes the
1305 * eepro100 driver (at least) gets upset and
1306 * doesn't work the first time it's opened.
1307 * But then if you close it and reopen it, it
1308 * works just fine. So we need to try that at
1309 * least once before giving up.
1311 * Also, if the root will be NFS-mounted, we
1312 * have nowhere to go if DHCP fails. So we
1313 * just have to keep trying forever.
1317 #ifdef CONFIG_ROOT_NFS
1318 if (ROOT_DEV
== Root_NFS
) {
1320 "IP-Config: Retrying forever (NFS root)...\n");
1327 "IP-Config: Reopening network devices...\n");
1331 /* Oh, well. At least we tried. */
1332 printk(KERN_ERR
"IP-Config: Auto-configuration of network failed.\n");
1335 #else /* !DYNAMIC */
1336 printk(KERN_ERR
"IP-Config: Incomplete network configuration information.\n");
1339 #endif /* IPCONFIG_DYNAMIC */
1341 /* Device selected manually or only one device -> use it */
1342 ic_dev
= ic_first_dev
->dev
;
1345 addr
= root_nfs_parse_addr(root_server_path
);
1346 if (root_server_addr
== NONE
)
1347 root_server_addr
= addr
;
1350 * Use defaults whereever applicable.
1352 if (ic_defaults() < 0)
1356 * Close all network devices except the device we've
1357 * autoconfigured and set up routes.
1360 if (ic_setup_if() < 0 || ic_setup_routes() < 0)
1364 * Record which protocol was actually used.
1366 #ifdef IPCONFIG_DYNAMIC
1367 ic_proto_used
= ic_got_reply
| (ic_proto_enabled
& IC_USE_DHCP
);
1370 #ifndef IPCONFIG_SILENT
1372 * Clue in the operator.
1374 printk("IP-Config: Complete:");
1375 printk("\n device=%s", ic_dev
->name
);
1376 printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr
));
1377 printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask
));
1378 printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway
));
1379 printk(",\n host=%s, domain=%s, nis-domain=%s",
1380 utsname()->nodename
, ic_domain
, utsname()->domainname
);
1381 printk(",\n bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr
));
1382 printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr
));
1383 printk(", rootpath=%s", root_server_path
);
1385 #endif /* !SILENT */
1390 late_initcall(ip_auto_config
);
1394 * Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
1395 * command line parameter. It consists of option fields separated by colons in
1396 * the following order:
1398 * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO>
1400 * Any of the fields can be empty which means to use a default value:
1401 * <client-ip> - address given by BOOTP or RARP
1402 * <server-ip> - address of host returning BOOTP or RARP packet
1403 * <gw-ip> - none, or the address returned by BOOTP
1404 * <netmask> - automatically determined from <client-ip>, or the
1405 * one returned by BOOTP
1406 * <host name> - <client-ip> in ASCII notation, or the name returned
1408 * <device> - use all available devices
1410 * off|none - don't do autoconfig at all (DEFAULT)
1411 * on|any - use any configured protocol
1412 * dhcp|bootp|rarp - use only the specified protocol
1413 * both - use both BOOTP and RARP (not DHCP)
1415 static int __init
ic_proto_name(char *name
)
1417 if (!strcmp(name
, "on") || !strcmp(name
, "any")) {
1420 #ifdef CONFIG_IP_PNP_DHCP
1421 else if (!strcmp(name
, "dhcp")) {
1422 ic_proto_enabled
&= ~IC_RARP
;
1426 #ifdef CONFIG_IP_PNP_BOOTP
1427 else if (!strcmp(name
, "bootp")) {
1428 ic_proto_enabled
&= ~(IC_RARP
| IC_USE_DHCP
);
1432 #ifdef CONFIG_IP_PNP_RARP
1433 else if (!strcmp(name
, "rarp")) {
1434 ic_proto_enabled
&= ~(IC_BOOTP
| IC_USE_DHCP
);
1438 #ifdef IPCONFIG_DYNAMIC
1439 else if (!strcmp(name
, "both")) {
1440 ic_proto_enabled
&= ~IC_USE_DHCP
; /* backward compat :-( */
1447 static int __init
ip_auto_config_setup(char *addrs
)
1452 ic_set_manually
= 1;
1454 ic_enable
= (*addrs
&&
1455 (strcmp(addrs
, "off") != 0) &&
1456 (strcmp(addrs
, "none") != 0));
1460 if (ic_proto_name(addrs
))
1463 /* Parse the whole string */
1466 if ((cp
= strchr(ip
, ':')))
1468 if (strlen(ip
) > 0) {
1469 DBG(("IP-Config: Parameter #%d: `%s'\n", num
, ip
));
1472 if ((ic_myaddr
= in_aton(ip
)) == INADDR_ANY
)
1476 if ((ic_servaddr
= in_aton(ip
)) == INADDR_ANY
)
1480 if ((ic_gateway
= in_aton(ip
)) == INADDR_ANY
)
1484 if ((ic_netmask
= in_aton(ip
)) == INADDR_ANY
)
1488 if ((dp
= strchr(ip
, '.'))) {
1490 strlcpy(utsname()->domainname
, dp
,
1491 sizeof(utsname()->domainname
));
1493 strlcpy(utsname()->nodename
, ip
,
1494 sizeof(utsname()->nodename
));
1495 ic_host_name_set
= 1;
1498 strlcpy(user_dev_name
, ip
, sizeof(user_dev_name
));
1512 static int __init
nfsaddrs_config_setup(char *addrs
)
1514 return ip_auto_config_setup(addrs
);
1517 __setup("ip=", ip_auto_config_setup
);
1518 __setup("nfsaddrs=", nfsaddrs_config_setup
);