patch-2.4.5 linux/net/ipv4/ipconfig.c
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- Lines: 1197
- Date:
Tue May 1 20:59:24 2001
- Orig file:
v2.4.4/linux/net/ipv4/ipconfig.c
- Orig date:
Fri Feb 9 11:34:13 2001
diff -u --recursive --new-file v2.4.4/linux/net/ipv4/ipconfig.c linux/net/ipv4/ipconfig.c
@@ -1,10 +1,10 @@
/*
- * $Id: ipconfig.c,v 1.35 2000/12/30 06:46:36 davem Exp $
+ * $Id: ipconfig.c,v 1.37 2001/04/30 18:54:12 davem Exp $
*
- * Automatic Configuration of IP -- use BOOTP or RARP or user-supplied
- * information to configure own IP address and routes.
+ * Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or
+ * user-supplied information to configure own IP address and routes.
*
- * Copyright (C) 1996--1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
+ * Copyright (C) 1996-1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
*
* Derived from network configuration code in fs/nfs/nfsroot.c,
* originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
@@ -16,6 +16,16 @@
* Fixed ip_auto_config_setup calling at startup in the new "Linker Magic"
* initialization scheme.
* - Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 08/11/1999
+ *
+ * DHCP support added. To users this looks like a whole separate
+ * protocol, but we know it's just a bag on the side of BOOTP.
+ * -- Chip Salzenberg <chip@valinux.com>, May 2000
+ *
+ * Ported DHCP support from 2.2.16 to 2.4.0-test4
+ * -- Eric Biederman <ebiederman@lnxi.com>, 30 Aug 2000
+ *
+ * Merged changes from 2.2.19 into 2.4.3
+ * -- Eric Biederman <ebiederman@lnxi.com>, 22 April Aug 2001
*/
#include <linux/config.h>
@@ -36,6 +46,7 @@
#include <linux/socket.h>
#include <linux/route.h>
#include <linux/udp.h>
+#include <linux/proc_fs.h>
#include <net/arp.h>
#include <net/ip.h>
#include <net/ipconfig.h>
@@ -52,48 +63,94 @@
#define DBG(x) do { } while(0)
#endif
-/* Define the timeout for waiting for a RARP/BOOTP reply */
-#define CONF_BASE_TIMEOUT (HZ*5) /* Initial timeout: 5 seconds */
-#define CONF_RETRIES 10 /* 10 retries */
+#if defined(CONFIG_IP_PNP_DHCP)
+#define IPCONFIG_DHCP
+#endif
+#if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
+#define IPCONFIG_BOOTP
+#endif
+#if defined(CONFIG_IP_PNP_RARP)
+#define IPCONFIG_RARP
+#endif
+#if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
+#define IPCONFIG_DYNAMIC
+#endif
+
+/* Define the friendly delay before and after opening net devices */
+#define CONF_PRE_OPEN (HZ/2) /* Before opening: 1/2 second */
+#define CONF_POST_OPEN (1*HZ) /* After opening: 1 second */
+
+/* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
+#define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
+#define CONF_SEND_RETRIES 6 /* Send six requests per open */
+#define CONF_INTER_TIMEOUT (HZ/2) /* Inter-device timeout: 1/2 second */
+#define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
#define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
-#define CONF_TIMEOUT_MULT *5/4 /* Rate of timeout growth */
+#define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
#define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
-/* IP configuration */
-static char user_dev_name[IFNAMSIZ] __initdata = { 0, };/* Name of user-selected boot device */
-u32 ic_myaddr __initdata = INADDR_NONE; /* My IP address */
-u32 ic_servaddr __initdata = INADDR_NONE; /* Server IP address */
-u32 ic_gateway __initdata = INADDR_NONE; /* Gateway IP address */
-u32 ic_netmask __initdata = INADDR_NONE; /* Netmask for local subnet */
-int ic_enable __initdata = 1; /* Automatic IP configuration enabled */
-int ic_host_name_set __initdata = 0; /* Host name configured manually */
-int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
-u32 root_server_addr __initdata = INADDR_NONE; /* Address of boot server */
-u8 root_server_path[256] __initdata = { 0, }; /* Path to mount as root */
+/*
+ * Public IP configuration
+ */
-#if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_RARP)
+/* This is used by platforms which might be able to set the ipconfig
+ * variabled using firmware environment vars. If this is set, it will
+ * ignore such firmware variables.
+ */
+int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
-#define CONFIG_IP_PNP_DYNAMIC
+int ic_enable __initdata = 0; /* IP config enabled? */
-int ic_proto_enabled __initdata = 0 /* Protocols enabled */
-#ifdef CONFIG_IP_PNP_BOOTP
+/* Protocol choice */
+int ic_proto_enabled __initdata = 0
+#ifdef IPCONFIG_BOOTP
| IC_BOOTP
#endif
-#ifdef CONFIG_IP_PNP_RARP
+#ifdef CONFIG_IP_PNP_DHCP
+ | IC_USE_DHCP
+#endif
+#ifdef IPCONFIG_RARP
| IC_RARP
#endif
;
-static int ic_got_reply __initdata = 0; /* Protocol(s) we got reply from */
-#else
+int ic_host_name_set __initdata = 0; /* Host name set by us? */
-static int ic_proto_enabled __initdata = 0;
+u32 ic_myaddr __initdata = INADDR_NONE; /* My IP address */
+u32 ic_netmask __initdata = INADDR_NONE; /* Netmask for local subnet */
+u32 ic_gateway __initdata = INADDR_NONE; /* Gateway IP address */
-#endif
+u32 ic_servaddr __initdata = INADDR_NONE; /* Boot server IP address */
+u32 root_server_addr __initdata = INADDR_NONE; /* Address of NFS server */
+u8 root_server_path[256] __initdata = { 0, }; /* Path to mount as root */
+
+/* Persistent data: */
+
+int ic_proto_used; /* Protocol used, if any */
+u32 ic_nameserver = INADDR_NONE; /* DNS Server IP address */
+u8 ic_domain[64]; /* DNS (not NIS) domain name */
+
+/*
+ * Private state.
+ */
+
+/* Name of user-selected boot device */
+static char user_dev_name[IFNAMSIZ] __initdata = { 0, };
+
+/* Protocols supported by available interfaces */
static int ic_proto_have_if __initdata = 0;
+#ifdef IPCONFIG_DYNAMIC
+static spinlock_t ic_recv_lock = SPIN_LOCK_UNLOCKED;
+static volatile int ic_got_reply __initdata = 0; /* Proto(s) that replied */
+#endif
+#ifdef IPCONFIG_DHCP
+static int ic_dhcp_msgtype __initdata = 0; /* DHCP msg type received */
+#endif
+
+
/*
* Network devices
*/
@@ -102,11 +159,12 @@
struct ic_device *next;
struct net_device *dev;
unsigned short flags;
- int able;
+ short able;
+ u32 xid;
};
static struct ic_device *ic_first_dev __initdata = NULL;/* List of open device */
-static struct net_device *ic_dev __initdata = NULL; /* Selected device */
+static struct net_device *ic_dev __initdata = NULL; /* Selected device */
static int __init ic_open_devs(void)
{
@@ -125,7 +183,7 @@
if (dev->mtu >= 364)
able |= IC_BOOTP;
else
- printk(KERN_WARNING "BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
+ printk(KERN_WARNING "DHCP/BOOTP: Ignoring device %s, MTU %d too small", dev->name, dev->mtu);
if (!(dev->flags & IFF_NOARP))
able |= IC_RARP;
able &= ic_proto_enabled;
@@ -143,8 +201,13 @@
last = &d->next;
d->flags = oflags;
d->able = able;
+ if (able & IC_BOOTP)
+ get_random_bytes(&d->xid, sizeof(u32));
+ else
+ d->xid = 0;
ic_proto_have_if |= able;
- DBG(("IP-Config: Opened %s (able=%d)\n", dev->name, able));
+ DBG(("IP-Config: %s UP (able=%d, xid=%08x)\n",
+ dev->name, able, d->xid));
}
}
rtnl_shunlock();
@@ -282,18 +345,18 @@
*/
if (!ic_host_name_set)
- strcpy(system_utsname.nodename, in_ntoa(ic_myaddr));
+ sprintf(system_utsname.nodename, "%u.%u.%u.%u", NIPQUAD(ic_myaddr));
if (root_server_addr == INADDR_NONE)
root_server_addr = ic_servaddr;
if (ic_netmask == INADDR_NONE) {
if (IN_CLASSA(ntohl(ic_myaddr)))
- ic_netmask = htonl(IN_CLASSA_NET);
+ ic_netmask = __constant_htonl(IN_CLASSA_NET);
else if (IN_CLASSB(ntohl(ic_myaddr)))
- ic_netmask = htonl(IN_CLASSB_NET);
+ ic_netmask = __constant_htonl(IN_CLASSB_NET);
else if (IN_CLASSC(ntohl(ic_myaddr)))
- ic_netmask = htonl(IN_CLASSC_NET);
+ ic_netmask = __constant_htonl(IN_CLASSC_NET);
else {
printk(KERN_ERR "IP-Config: Unable to guess netmask for address %u.%u.%u.%u\n",
NIPQUAD(ic_myaddr));
@@ -309,16 +372,13 @@
* RARP support.
*/
-#ifdef CONFIG_IP_PNP_RARP
+#ifdef IPCONFIG_RARP
static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt);
static struct packet_type rarp_packet_type __initdata = {
- __constant_htons(ETH_P_RARP),
- NULL, /* Listen to all devices */
- ic_rarp_recv,
- NULL,
- NULL
+ type: __constant_htons(ETH_P_RARP),
+ func: ic_rarp_recv,
};
static inline void ic_rarp_init(void)
@@ -341,21 +401,32 @@
unsigned char *rarp_ptr = (unsigned char *) (rarp + 1);
unsigned long sip, tip;
unsigned char *sha, *tha; /* s for "source", t for "target" */
+ struct ic_device *d;
+
+ /* One reply at a time, please. */
+ spin_lock(&ic_recv_lock);
/* If we already have a reply, just drop the packet */
if (ic_got_reply)
goto drop;
+ /* Find the ic_device that the packet arrived on */
+ d = ic_first_dev;
+ while (d && d->dev != dev)
+ d = d->next;
+ if (!d)
+ goto drop; /* should never happen */
+
/* If this test doesn't pass, it's not IP, or we should ignore it anyway */
if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd))
goto drop;
/* If it's not a RARP reply, delete it. */
- if (rarp->ar_op != htons(ARPOP_RREPLY))
+ if (rarp->ar_op != __constant_htons(ARPOP_RREPLY))
goto drop;
/* If it's not Ethernet, delete it. */
- if (rarp->ar_pro != htons(ETH_P_IP))
+ if (rarp->ar_pro != __constant_htons(ETH_P_IP))
goto drop;
/* Extract variable-width fields */
@@ -375,44 +446,39 @@
if (ic_servaddr != INADDR_NONE && ic_servaddr != sip)
goto drop;
- /* Victory! The packet is what we were looking for! */
- if (!ic_got_reply) {
- ic_got_reply = IC_RARP;
- ic_dev = dev;
- if (ic_myaddr == INADDR_NONE)
- ic_myaddr = tip;
- ic_servaddr = sip;
- }
+ /* We have a winner! */
+ ic_dev = dev;
+ if (ic_myaddr == INADDR_NONE)
+ ic_myaddr = tip;
+ ic_servaddr = sip;
+ ic_got_reply = IC_RARP;
- /* And throw the packet out... */
drop:
+ /* Show's over. Nothing to see here. */
+ spin_unlock(&ic_recv_lock);
+
+ /* Throw the packet out. */
kfree_skb(skb);
return 0;
}
/*
- * Send RARP request packet over all devices which allow RARP.
+ * Send RARP request packet over a signle interface.
*/
-static void __init ic_rarp_send(void)
+static void __init ic_rarp_send_if(struct ic_device *d)
{
- struct ic_device *d;
-
- for (d=ic_first_dev; d; d=d->next)
- if (d->able & IC_RARP) {
- struct net_device *dev = d->dev;
- arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
- dev->dev_addr, dev->dev_addr);
- }
+ struct net_device *dev = d->dev;
+ arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
+ dev->dev_addr, dev->dev_addr);
}
-
#endif
/*
- * BOOTP support.
+ * DHCP/BOOTP support.
*/
-#ifdef CONFIG_IP_PNP_BOOTP
+#ifdef IPCONFIG_BOOTP
struct bootp_pkt { /* BOOTP packet format */
struct iphdr iph; /* IP header */
@@ -426,45 +492,110 @@
u16 flags; /* Just what it says */
u32 client_ip; /* Client's IP address if known */
u32 your_ip; /* Assigned IP address */
- u32 server_ip; /* Server's IP address */
+ u32 server_ip; /* (Next, e.g. NFS) Server's IP address */
u32 relay_ip; /* IP address of BOOTP relay */
u8 hw_addr[16]; /* Client's HW address */
u8 serv_name[64]; /* Server host name */
u8 boot_file[128]; /* Name of boot file */
- u8 vendor_area[128]; /* Area for extensions */
+ u8 exten[312]; /* DHCP options / BOOTP vendor extensions */
};
-#define BOOTP_REQUEST 1
-#define BOOTP_REPLY 2
-
-static u32 ic_bootp_xid;
+/* packet ops */
+#define BOOTP_REQUEST 1
+#define BOOTP_REPLY 2
+
+/* DHCP message types */
+#define DHCPDISCOVER 1
+#define DHCPOFFER 2
+#define DHCPREQUEST 3
+#define DHCPDECLINE 4
+#define DHCPACK 5
+#define DHCPNAK 6
+#define DHCPRELEASE 7
+#define DHCPINFORM 8
static int ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt);
static struct packet_type bootp_packet_type __initdata = {
- __constant_htons(ETH_P_IP),
- NULL, /* Listen to all devices */
- ic_bootp_recv,
- NULL,
- NULL
+ type: __constant_htons(ETH_P_IP),
+ func: ic_bootp_recv,
};
/*
- * Initialize BOOTP extension fields in the request.
+ * Initialize DHCP/BOOTP extension fields in the request.
*/
+
+static const u8 ic_bootp_cookie[4] = { 99, 130, 83, 99 };
+
+#ifdef IPCONFIG_DHCP
+
+static void __init
+ic_dhcp_init_options(u8 *options)
+{
+ u8 mt = ((ic_servaddr == INADDR_NONE)
+ ? DHCPDISCOVER : DHCPREQUEST);
+ u8 *e = options;
+
+#ifdef IPCONFIG_DEBUG
+ printk("DHCP: Sending message type %d\n", mt);
+#endif
+
+ memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
+ e += 4;
+
+ *e++ = 53; /* DHCP message type */
+ *e++ = 1;
+ *e++ = mt;
+
+ if (mt == DHCPREQUEST) {
+ *e++ = 54; /* Server ID (IP address) */
+ *e++ = 4;
+ memcpy(e, &ic_servaddr, 4);
+ e += 4;
+
+ *e++ = 50; /* Requested IP address */
+ *e++ = 4;
+ memcpy(e, &ic_myaddr, 4);
+ e += 4;
+ }
+
+ /* always? */
+ {
+ static const u8 ic_req_params[] = {
+ 1, /* Subnet mask */
+ 3, /* Default gateway */
+ 6, /* DNS server */
+ 12, /* Host name */
+ 15, /* Domain name */
+ 17, /* Boot path */
+ 40, /* NIS domain name */
+ };
+
+ *e++ = 55; /* Parameter request list */
+ *e++ = sizeof(ic_req_params);
+ memcpy(e, ic_req_params, sizeof(ic_req_params));
+ e += sizeof(ic_req_params);
+ }
+
+ *e++ = 255; /* End of the list */
+}
+
+#endif /* IPCONFIG_DHCP */
+
static void __init ic_bootp_init_ext(u8 *e)
{
- *e++ = 99; /* RFC1048 Magic Cookie */
- *e++ = 130;
- *e++ = 83;
- *e++ = 99;
+ memcpy(e, ic_bootp_cookie, 4); /* RFC1048 Magic Cookie */
+ e += 4;
*e++ = 1; /* Subnet mask request */
*e++ = 4;
e += 4;
*e++ = 3; /* Default gateway request */
*e++ = 4;
e += 4;
+ *e++ = 5; /* Name server reqeust */
+ *e++ = 8;
+ e += 8;
*e++ = 12; /* Host name request */
*e++ = 32;
e += 32;
@@ -472,25 +603,23 @@
*e++ = 32;
e += 32;
*e++ = 17; /* Boot path */
- *e++ = 32;
- e += 32;
- *e = 255; /* End of the list */
+ *e++ = 40;
+ e += 40;
+ *e++ = 255; /* End of the list */
}
/*
- * Initialize the BOOTP mechanism.
+ * Initialize the DHCP/BOOTP mechanism.
*/
static inline void ic_bootp_init(void)
{
- get_random_bytes(&ic_bootp_xid, sizeof(u32));
- DBG(("BOOTP: XID=%08x\n", ic_bootp_xid));
dev_add_pack(&bootp_packet_type);
}
/*
- * BOOTP cleanup.
+ * DHCP/BOOTP cleanup.
*/
static inline void ic_bootp_cleanup(void)
{
@@ -499,7 +628,7 @@
/*
- * Send BOOTP request to single interface.
+ * Send DHCP/BOOTP request to single interface.
*/
static void __init ic_bootp_send_if(struct ic_device *d, u32 jiffies)
{
@@ -522,19 +651,19 @@
h->version = 4;
h->ihl = 5;
h->tot_len = htons(sizeof(struct bootp_pkt));
- h->frag_off = htons(IP_DF);
+ h->frag_off = __constant_htons(IP_DF);
h->ttl = 64;
h->protocol = IPPROTO_UDP;
h->daddr = INADDR_BROADCAST;
h->check = ip_fast_csum((unsigned char *) h, h->ihl);
/* Construct UDP header */
- b->udph.source = htons(68);
- b->udph.dest = htons(67);
+ b->udph.source = __constant_htons(68);
+ b->udph.dest = __constant_htons(67);
b->udph.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
/* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */
- /* Construct BOOTP header */
+ /* Construct DHCP/BOOTP header */
b->op = BOOTP_REQUEST;
if (dev->type < 256) /* check for false types */
b->htype = dev->type;
@@ -545,10 +674,19 @@
b->htype = dev->type; /* can cause undefined behavior */
}
b->hlen = dev->addr_len;
+ b->your_ip = INADDR_NONE;
+ b->server_ip = INADDR_NONE;
memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
b->secs = htons(jiffies / HZ);
- b->xid = ic_bootp_xid;
- ic_bootp_init_ext(b->vendor_area);
+ b->xid = d->xid;
+
+ /* add DHCP options or BOOTP extensions */
+#ifdef IPCONFIG_DHCP
+ if (ic_proto_enabled & IC_USE_DHCP)
+ ic_dhcp_init_options(b->exten);
+ else
+#endif
+ ic_bootp_init_ext(b->exten);
/* Chain packet down the line... */
skb->dev = dev;
@@ -561,19 +699,6 @@
/*
- * Send BOOTP requests to all interfaces.
- */
-static void __init ic_bootp_send(u32 jiffies)
-{
- struct ic_device *d;
-
- for(d=ic_first_dev; d; d=d->next)
- if (d->able & IC_BOOTP)
- ic_bootp_send_if(d, jiffies);
-}
-
-
-/*
* Copy BOOTP-supplied string if not already set.
*/
static int __init ic_bootp_string(char *dest, char *src, int len, int max)
@@ -582,21 +707,21 @@
return 0;
if (len > max-1)
len = max-1;
- strncpy(dest, src, len);
+ memcpy(dest, src, len);
dest[len] = '\0';
return 1;
}
/*
- * Process BOOTP extension.
+ * Process BOOTP extensions.
*/
static void __init ic_do_bootp_ext(u8 *ext)
{
#ifdef IPCONFIG_DEBUG
u8 *c;
- printk("BOOTP: Got extension %02x",*ext);
+ printk("DHCP/BOOTP: Got extension %d:",*ext);
for(c=ext+2; c<ext+2+ext[1]; c++)
printk(" %02x", *c);
printk("\n");
@@ -611,17 +736,24 @@
if (ic_gateway == INADDR_NONE)
memcpy(&ic_gateway, ext+1, 4);
break;
+ case 6: /* DNS server */
+ if (ic_nameserver == INADDR_NONE)
+ memcpy(&ic_nameserver, ext+1, 4);
+ break;
case 12: /* Host name */
ic_bootp_string(system_utsname.nodename, ext+1, *ext, __NEW_UTS_LEN);
ic_host_name_set = 1;
break;
- case 40: /* NIS Domain name */
- ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN);
+ case 15: /* Domain name (DNS) */
+ ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
break;
case 17: /* Root path */
if (!root_server_path[0])
ic_bootp_string(root_server_path, ext+1, *ext, sizeof(root_server_path));
break;
+ case 40: /* NIS Domain name (_not_ DNS) */
+ ic_bootp_string(system_utsname.domainname, ext+1, *ext, __NEW_UTS_LEN);
+ break;
}
}
@@ -633,12 +765,23 @@
{
struct bootp_pkt *b = (struct bootp_pkt *) skb->nh.iph;
struct iphdr *h = &b->iph;
+ struct ic_device *d;
int len;
+ /* One reply at a time, please. */
+ spin_lock(&ic_recv_lock);
+
/* If we already have a reply, just drop the packet */
if (ic_got_reply)
goto drop;
+ /* Find the ic_device that the packet arrived on */
+ d = ic_first_dev;
+ while (d && d->dev != dev)
+ d = d->next;
+ if (!d)
+ goto drop; /* should never happen */
+
/* Check whether it's a BOOTP packet */
if (skb->pkt_type == PACKET_OTHERHOST ||
skb->len < sizeof(struct udphdr) + sizeof(struct iphdr) ||
@@ -647,14 +790,14 @@
ip_fast_csum((char *) h, h->ihl) != 0 ||
skb->len < ntohs(h->tot_len) ||
h->protocol != IPPROTO_UDP ||
- b->udph.source != htons(67) ||
- b->udph.dest != htons(68) ||
+ b->udph.source != __constant_htons(67) ||
+ b->udph.dest != __constant_htons(68) ||
ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
goto drop;
/* Fragments are not supported */
- if (h->frag_off & htons(IP_OFFSET|IP_MF)) {
- printk(KERN_ERR "BOOTP: Ignoring fragmented reply.\n");
+ if (h->frag_off & __constant_htons(IP_OFFSET | IP_MF)) {
+ printk(KERN_ERR "DHCP/BOOTP: Ignoring fragmented reply.\n");
goto drop;
}
@@ -662,41 +805,103 @@
len = ntohs(b->udph.len) - sizeof(struct udphdr);
if (len < 300 || /* See RFC 951:2.1 */
b->op != BOOTP_REPLY ||
- b->xid != ic_bootp_xid) {
+ b->xid != d->xid) {
printk("?");
goto drop;
}
- /* Extract basic fields */
- ic_myaddr = b->your_ip;
- ic_servaddr = b->server_ip;
- ic_got_reply = IC_BOOTP;
- ic_dev = dev;
-
/* Parse extensions */
- if (b->vendor_area[0] == 99 && /* Check magic cookie */
- b->vendor_area[1] == 130 &&
- b->vendor_area[2] == 83 &&
- b->vendor_area[3] == 99) {
- u8 *ext = &b->vendor_area[4];
+ if (!memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
+ u8 *ext;
+
+#ifdef IPCONFIG_DHCP
+
+ u32 server_id = INADDR_NONE;
+ int mt = 0;
+
+ ext = &b->exten[4];
while (ext < end && *ext != 0xff) {
- if (*ext == 0) /* Padding */
- ext++;
- else {
- u8 *opt = ext;
- ext += ext[1] + 2;
- if (ext <= end)
- ic_do_bootp_ext(opt);
+ u8 *opt = ext++;
+ if (*opt == 0) /* Padding */
+ continue;
+ ext += *ext + 1;
+ if (ext >= end)
+ break;
+ switch (*opt) {
+ case 53: /* Message type */
+ if (opt[1])
+ mt = opt[2];
+ break;
+ case 54: /* Server ID (IP address) */
+ if (opt[1] >= 4)
+ memcpy(&server_id, opt + 2, 4);
+ break;
}
}
+
+#ifdef IPCONFIG_DEBUG
+ printk("DHCP: Got message type %d\n", mt);
+#endif
+
+ switch (mt) {
+ case DHCPOFFER:
+ /* While in the process of accepting one offer,
+ ignore all others. */
+ if (ic_myaddr != INADDR_NONE)
+ goto drop;
+ /* Let's accept that offer. */
+ ic_myaddr = b->your_ip;
+ ic_servaddr = server_id;
+#ifdef IPCONFIG_DEBUG
+ printk("DHCP: Offered address %u.%u.%u.%u", NIPQUAD(ic_myaddr));
+ printk(" by server %u.%u.%u.%u\n", NIPQUAD(ic_servaddr));
+#endif
+ break;
+
+ case DHCPACK:
+ /* Yeah! */
+ break;
+
+ default:
+ /* Urque. Forget it*/
+ ic_myaddr = INADDR_NONE;
+ ic_servaddr = INADDR_NONE;
+ goto drop;
+ }
+
+ ic_dhcp_msgtype = mt;
+
+#endif /* IPCONFIG_DHCP */
+
+ ext = &b->exten[4];
+ while (ext < end && *ext != 0xff) {
+ u8 *opt = ext++;
+ if (*opt == 0) /* Padding */
+ continue;
+ ext += *ext + 1;
+ if (ext < end)
+ ic_do_bootp_ext(opt);
+ }
}
+ /* We have a winner! */
+ ic_dev = dev;
+ ic_myaddr = b->your_ip;
+ ic_servaddr = b->server_ip;
if (ic_gateway == INADDR_NONE && b->relay_ip)
ic_gateway = b->relay_ip;
+ if (ic_nameserver == INADDR_NONE)
+ ic_nameserver = ic_servaddr;
+ ic_got_reply = IC_BOOTP;
drop:
+ /* Show's over. Nothing to see here. */
+ spin_unlock(&ic_recv_lock);
+
+ /* Throw the packet out. */
kfree_skb(skb);
+
return 0;
}
@@ -705,36 +910,34 @@
/*
- * Dynamic IP configuration -- BOOTP and RARP.
+ * Dynamic IP configuration -- DHCP, BOOTP, RARP.
*/
-#ifdef CONFIG_IP_PNP_DYNAMIC
+#ifdef IPCONFIG_DYNAMIC
static int __init ic_dynamic(void)
{
int retries;
- unsigned long timeout, jiff;
- unsigned long start_jiffies;
- int do_rarp = ic_proto_have_if & IC_RARP;
+ struct ic_device *d;
+ unsigned long start_jiffies, timeout, jiff;
int do_bootp = ic_proto_have_if & IC_BOOTP;
+ int do_rarp = ic_proto_have_if & IC_RARP;
/*
- * If neither BOOTP nor RARP was selected, return with an error. This
- * routine gets only called when some pieces of information are mis-
- * sing, and without BOOTP and RARP we are not able to get that in-
- * formation.
+ * If none of DHCP/BOOTP/RARP was selected, return with an error.
+ * This routine gets only called when some pieces of information
+ * are missing, and without DHCP/BOOTP/RARP we are unable to get it.
*/
if (!ic_proto_enabled) {
printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
return -1;
}
-#ifdef CONFIG_IP_PNP_BOOTP
+#ifdef IPCONFIG_BOOTP
if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
- printk(KERN_ERR "BOOTP: No suitable device found.\n");
+ printk(KERN_ERR "DHCP/BOOTP: No suitable device found.\n");
#endif
-
-#ifdef CONFIG_IP_PNP_RARP
+#ifdef IPCONFIG_RARP
if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
printk(KERN_ERR "RARP: No suitable device found.\n");
#endif
@@ -744,16 +947,16 @@
return -1;
/*
- * Setup RARP and BOOTP protocols
+ * Setup protocols
*/
-#ifdef CONFIG_IP_PNP_RARP
- if (do_rarp)
- ic_rarp_init();
-#endif
-#ifdef CONFIG_IP_PNP_BOOTP
+#ifdef IPCONFIG_BOOTP
if (do_bootp)
ic_bootp_init();
#endif
+#ifdef IPCONFIG_RARP
+ if (do_rarp)
+ ic_rarp_init();
+#endif
/*
* Send requests and wait, until we get an answer. This loop
@@ -763,61 +966,119 @@
* [Actually we could now, but the nothing else running note still
* applies.. - AC]
*/
- printk(KERN_NOTICE "Sending %s%s%s requests...",
- do_bootp ? "BOOTP" : "",
- do_bootp && do_rarp ? " and " : "",
- do_rarp ? "RARP" : "");
+ printk(KERN_NOTICE "Sending %s%s%s requests .",
+ do_bootp
+ ? ((ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP") : "",
+ (do_bootp && do_rarp) ? " and " : "",
+ do_rarp ? "RARP" : "");
+
start_jiffies = jiffies;
- retries = CONF_RETRIES;
+ d = ic_first_dev;
+ retries = CONF_SEND_RETRIES;
get_random_bytes(&timeout, sizeof(timeout));
timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned) CONF_TIMEOUT_RANDOM);
for(;;) {
-#ifdef CONFIG_IP_PNP_BOOTP
- if (do_bootp)
- ic_bootp_send(jiffies - start_jiffies);
+#ifdef IPCONFIG_BOOTP
+ if (do_bootp && (d->able & IC_BOOTP))
+ ic_bootp_send_if(d, jiffies - start_jiffies);
#endif
-#ifdef CONFIG_IP_PNP_RARP
- if (do_rarp)
- ic_rarp_send();
+#ifdef IPCONFIG_RARP
+ if (do_rarp && (d->able & IC_RARP))
+ ic_rarp_send_if(d);
#endif
- printk(".");
- jiff = jiffies + timeout;
+
+ jiff = jiffies + (d->next ? CONF_INTER_TIMEOUT : timeout);
while (jiffies < jiff && !ic_got_reply)
barrier();
+#ifdef IPCONFIG_DHCP
+ /* DHCP isn't done until we get a DHCPACK. */
+ if ((ic_got_reply & IC_BOOTP)
+ && (ic_proto_enabled & IC_USE_DHCP)
+ && ic_dhcp_msgtype != DHCPACK)
+ {
+ ic_got_reply = 0;
+ printk(",");
+ continue;
+ }
+#endif /* IPCONFIG_DHCP */
+
if (ic_got_reply) {
printk(" OK\n");
break;
}
+
+ if ((d = d->next))
+ continue;
+
if (! --retries) {
printk(" timed out!\n");
break;
}
+
+ d = ic_first_dev;
+
timeout = timeout CONF_TIMEOUT_MULT;
if (timeout > CONF_TIMEOUT_MAX)
timeout = CONF_TIMEOUT_MAX;
+
+ printk(".");
}
-#ifdef CONFIG_IP_PNP_RARP
- if (do_rarp)
- ic_rarp_cleanup();
-#endif
-#ifdef CONFIG_IP_PNP_BOOTP
+#ifdef IPCONFIG_BOOTP
if (do_bootp)
ic_bootp_cleanup();
#endif
+#ifdef IPCONFIG_RARP
+ if (do_rarp)
+ ic_rarp_cleanup();
+#endif
if (!ic_got_reply)
return -1;
printk("IP-Config: Got %s answer from %u.%u.%u.%u, ",
- (ic_got_reply & IC_BOOTP) ? "BOOTP" : "RARP",
+ ((ic_got_reply & IC_RARP) ? "RARP"
+ : (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
NIPQUAD(ic_servaddr));
printk("my address is %u.%u.%u.%u\n", NIPQUAD(ic_myaddr));
return 0;
}
-#endif
+#endif /* IPCONFIG_DYNAMIC */
+
+#ifdef CONFIG_PROC_FS
+
+static int pnp_get_info(char *buffer, char **start,
+ off_t offset, int length)
+{
+ int len;
+
+ if (ic_proto_used & IC_PROTO)
+ sprintf(buffer, "#PROTO: %s\n",
+ (ic_proto_used & IC_RARP) ? "RARP"
+ : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
+ else
+ strcpy(buffer, "#MANUAL\n");
+ len = strlen(buffer);
+
+ if (ic_domain[0])
+ len += sprintf(buffer + len,
+ "domain %s\n", ic_domain);
+ if (ic_nameserver != INADDR_NONE)
+ len += sprintf(buffer + len,
+ "nameserver %u.%u.%u.%u\n", NIPQUAD(ic_nameserver));
+
+ if (offset > len)
+ offset = len;
+ *start = buffer + offset;
+
+ if (offset + length > len)
+ length = len - offset;
+ return length;
+}
+
+#endif /* CONFIG_PROC_FS */
/*
* IP Autoconfig dispatcher.
@@ -825,15 +1086,33 @@
static int __init ip_auto_config(void)
{
+ int retries = CONF_OPEN_RETRIES;
+ unsigned long jiff;
+
+#ifdef CONFIG_PROC_FS
+ proc_net_create("pnp", 0, pnp_get_info);
+#endif /* CONFIG_PROC_FS */
+
if (!ic_enable)
return 0;
DBG(("IP-Config: Entered.\n"));
+ try_try_again:
+ /* Give hardware a chance to settle */
+ jiff = jiffies + CONF_PRE_OPEN;
+ while (jiffies < jiff)
+ ;
+
/* Setup all network devices */
if (ic_open_devs() < 0)
return -1;
+ /* Give drivers a chance to settle */
+ jiff = jiffies + CONF_POST_OPEN;
+ while (jiffies < jiff)
+ ;
+
/*
* If the config information is insufficient (e.g., our IP address or
* IP address of the boot server is missing or we have multiple network
@@ -845,19 +1124,51 @@
(root_server_addr == INADDR_NONE && ic_servaddr == INADDR_NONE) ||
#endif
ic_first_dev->next) {
-#ifdef CONFIG_IP_PNP_DYNAMIC
+#ifdef IPCONFIG_DYNAMIC
+
if (ic_dynamic() < 0) {
- printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
ic_close_devs();
+
+ /*
+ * I don't know why, but sometimes the
+ * eepro100 driver (at least) gets upset and
+ * doesn't work the first time it's opened.
+ * But then if you close it and reopen it, it
+ * works just fine. So we need to try that at
+ * least once before giving up.
+ *
+ * Also, if the root will be NFS-mounted, we
+ * have nowhere to go if DHCP fails. So we
+ * just have to keep trying forever.
+ *
+ * -- Chip
+ */
+#ifdef CONFIG_ROOT_NFS
+ if (ROOT_DEV == MKDEV(UNNAMED_MAJOR, 255)) {
+ printk(KERN_ERR
+ "IP-Config: Retrying forever (NFS root)...\n");
+ goto try_try_again;
+ }
+#endif
+
+ if (--retries) {
+ printk(KERN_ERR
+ "IP-Config: Reopening network devices...\n");
+ goto try_try_again;
+ }
+
+ /* Oh, well. At least we tried. */
+ printk(KERN_ERR "IP-Config: Auto-configuration of network failed.\n");
return -1;
}
-#else
+#else /* !DYNAMIC */
printk(KERN_ERR "IP-Config: Incomplete network configuration information.\n");
ic_close_devs();
return -1;
-#endif
+#endif /* IPCONFIG_DYNAMIC */
} else {
- ic_dev = ic_first_dev->dev; /* Device selected manually or only one device -> use it */
+ /* Device selected manually or only one device -> use it */
+ ic_dev = ic_first_dev->dev;
}
/*
@@ -874,10 +1185,30 @@
if (ic_setup_if() < 0 || ic_setup_routes() < 0)
return -1;
- DBG(("IP-Config: device=%s, local=%08x, server=%08x, boot=%08x, gw=%08x, mask=%08x\n",
- ic_dev->name, ic_myaddr, ic_servaddr, root_server_addr, ic_gateway, ic_netmask));
- DBG(("IP-Config: host=%s, domain=%s, path=`%s'\n", system_utsname.nodename,
- system_utsname.domainname, root_server_path));
+ /*
+ * Record which protocol was actually used.
+ */
+#ifdef IPCONFIG_DYNAMIC
+ ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
+#endif
+
+#ifndef IPCONFIG_SILENT
+ /*
+ * Clue in the operator.
+ */
+ printk("IP-Config: Complete:");
+ printk("\n device=%s", ic_dev->name);
+ printk(", addr=%u.%u.%u.%u", NIPQUAD(ic_myaddr));
+ printk(", mask=%u.%u.%u.%u", NIPQUAD(ic_netmask));
+ printk(", gw=%u.%u.%u.%u", NIPQUAD(ic_gateway));
+ printk(",\n host=%s, domain=%s, nis-domain=%s",
+ system_utsname.nodename, ic_domain, system_utsname.domainname);
+ printk(",\n bootserver=%u.%u.%u.%u", NIPQUAD(ic_servaddr));
+ printk(", rootserver=%u.%u.%u.%u", NIPQUAD(root_server_addr));
+ printk(", rootpath=%s", root_server_path);
+ printk("\n");
+#endif /* !SILENT */
+
return 0;
}
@@ -889,7 +1220,7 @@
* command line parameter. It consists of option fields separated by colons in
* the following order:
*
- * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<bootp|rarp>
+ * <client-ip>:<server-ip>:<gw-ip>:<netmask>:<host name>:<device>:<PROTO>
*
* Any of the fields can be empty which means to use a default value:
* <client-ip> - address given by BOOTP or RARP
@@ -900,28 +1231,38 @@
* <host name> - <client-ip> in ASCII notation, or the name returned
* by BOOTP
* <device> - use all available devices
- * <bootp|rarp|both|off> - use both protocols to determine my own address
+ * <PROTO>:
+ * off|none - don't do autoconfig at all (DEFAULT)
+ * on|any - use any configured protocol
+ * dhcp|bootp|rarp - use only the specified protocol
+ * both - use both BOOTP and RARP (not DHCP)
*/
static int __init ic_proto_name(char *name)
{
- if (!strcmp(name, "off")) {
- ic_proto_enabled = 0;
+ if (!strcmp(name, "on") || !strcmp(name, "any")) {
+ return 1;
+ }
+#ifdef CONFIG_IP_PNP_DHCP
+ else if (!strcmp(name, "dhcp")) {
+ ic_proto_enabled &= ~IC_RARP;
return 1;
}
+#endif
#ifdef CONFIG_IP_PNP_BOOTP
else if (!strcmp(name, "bootp")) {
- ic_proto_enabled &= ~IC_RARP;
+ ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
return 1;
}
#endif
#ifdef CONFIG_IP_PNP_RARP
else if (!strcmp(name, "rarp")) {
- ic_proto_enabled &= ~IC_BOOTP;
+ ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
return 1;
}
#endif
-#ifdef CONFIG_IP_PNP_DYNAMIC
+#ifdef IPCONFIG_DYNAMIC
else if (!strcmp(name, "both")) {
+ ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
return 1;
}
#endif
@@ -934,10 +1275,13 @@
int num = 0;
ic_set_manually = 1;
- if (!strcmp(addrs, "off")) {
- ic_enable = 0;
+
+ ic_enable = (*addrs &&
+ (strcmp(addrs, "off") != 0) &&
+ (strcmp(addrs, "none") != 0));
+ if (!ic_enable)
return 1;
- }
+
if (ic_proto_name(addrs))
return 1;
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)