cregit-Linux how code gets into the kernel

Release 4.11 net/ipv4/ipconfig.c

Directory: net/ipv4
/*
 *  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>
 *
 *  Derived from network configuration code in fs/nfs/nfsroot.c,
 *  originally Copyright (C) 1995, 1996 Gero Kuhlmann and me.
 *
 *  BOOTP rewritten to construct and analyse packets itself instead
 *  of misusing the IP layer. num_bugs_causing_wrong_arp_replies--;
 *                                           -- MJ, December 1998
 *
 *  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
 *
 *  Multiple Nameservers in /proc/net/pnp
 *              --  Josef Siemes <jsiemes@web.de>, Aug 2002
 */

#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/random.h>
#include <linux/init.h>
#include <linux/utsname.h>
#include <linux/in.h>
#include <linux/if.h>
#include <linux/inet.h>
#include <linux/inetdevice.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <linux/socket.h>
#include <linux/route.h>
#include <linux/udp.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/major.h>
#include <linux/root_dev.h>
#include <linux/delay.h>
#include <linux/nfs_fs.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <net/net_namespace.h>
#include <net/arp.h>
#include <net/ip.h>
#include <net/ipconfig.h>
#include <net/route.h>

#include <linux/uaccess.h>
#include <net/checksum.h>
#include <asm/processor.h>

#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_POST_OPEN		10	
/* After opening: 10 msecs */

#define CONF_CARRIER_TIMEOUT	120000	
/* Wait for carrier timeout */

/* 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_BASE_TIMEOUT	(HZ*2)	
/* Initial timeout: 2 seconds */

#define CONF_TIMEOUT_RANDOM	(HZ)	
/* Maximum amount of randomization */

#define CONF_TIMEOUT_MULT	*7/4	
/* Rate of timeout growth */

#define CONF_TIMEOUT_MAX	(HZ*30)	
/* Maximum allowed timeout */

#define CONF_NAMESERVERS_MAX   3       
/* Maximum number of nameservers
                                           - '3' from resolv.h */


#define NONE cpu_to_be32(INADDR_NONE)

#define ANY cpu_to_be32(INADDR_ANY)

/*
 * Public IP configuration
 */

/* This is used by platforms which might be able to set the ipconfig
 * variables using firmware environment vars.  If this is set, it will
 * ignore such firmware variables.
 */

int ic_set_manually __initdata = 0;		
/* IPconfig parameters set manually */


static int ic_enable __initdata;		
/* IP config enabled? */

/* Protocol choice */

int ic_proto_enabled __initdata = 0
#ifdef IPCONFIG_BOOTP
			| IC_BOOTP
#endif
#ifdef CONFIG_IP_PNP_DHCP
			| IC_USE_DHCP
#endif
#ifdef IPCONFIG_RARP
			| IC_RARP
#endif
			;


static int ic_host_name_set __initdata;	
/* Host name set by us? */


__be32 ic_myaddr = NONE;		
/* My IP address */

static __be32 ic_netmask = NONE;	
/* Netmask for local subnet */

__be32 ic_gateway = NONE;	
/* Gateway IP address */

#ifdef IPCONFIG_DYNAMIC

static __be32 ic_addrservaddr = NONE;	
/* IP Address of the IP addresses'server */
#endif


__be32 ic_servaddr = NONE;	
/* Boot server IP address */


__be32 root_server_addr = NONE;	
/* Address of NFS server */

u8 root_server_path[256] = { 0, };	
/* Path to mount as root */

/* vendor class identifier */

static char vendor_class_identifier[253] __initdata;

#if defined(CONFIG_IP_PNP_DHCP)

static char dhcp_client_identifier[253] __initdata;
#endif

/* Persistent data: */

#ifdef IPCONFIG_DYNAMIC

static int ic_proto_used;			
/* Protocol used, if any */
#else

#define ic_proto_used 0
#endif

static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; 
/* DNS Server IP addresses */

static 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;

/* MTU for boot device */

static int ic_dev_mtu __initdata;

#ifdef IPCONFIG_DYNAMIC
static DEFINE_SPINLOCK(ic_recv_lock);

static volatile int ic_got_reply __initdata;    
/* Proto(s) that replied */
#endif
#ifdef IPCONFIG_DHCP

static int ic_dhcp_msgtype __initdata;	
/* DHCP msg type received */
#endif


/*
 *      Network devices
 */


struct ic_device {
	
struct ic_device *next;
	
struct net_device *dev;
	
unsigned short flags;
	
short able;
	
__be32 xid;
};


static struct ic_device *ic_first_dev __initdata;	
/* List of open device */

static struct ic_device *ic_dev __initdata;		
/* Selected device */




static bool __init ic_is_init_dev(struct net_device *dev)
{
	if (dev->flags & IFF_LOOPBACK)
		return false;
	return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) :
	    (!(dev->flags & IFF_LOOPBACK) &&
	     (dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) &&
	     strncmp(dev->name, "dummy", 5));
}


Contributors
PersonTokensPropCommitsCommitProp
David S. Miller6284.93%150.00%


Micha Nelissen1115.07%150.00%


Total73100.00%2100.00%






static int __init ic_open_devs(void)
{
	struct ic_device *d, **last;
	struct net_device *dev;
	unsigned short oflags;
	unsigned long start, next_msg;

	last = &ic_first_dev;
	rtnl_lock();

	/* bring loopback and DSA master network devices up first */
	for_each_netdev(&init_net, dev) {
		if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))
			continue;
		if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
			pr_err("IP-Config: Failed to open %s\n", dev->name);
	}

	for_each_netdev(&init_net, dev) {
		if (ic_is_init_dev(dev)) {
			int able = 0;
			if (dev->mtu >= 364)
				able |= IC_BOOTP;
			else
				pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n",
					dev->name, dev->mtu);
			if (!(dev->flags & IFF_NOARP))
				able |= IC_RARP;
			able &= ic_proto_enabled;
			if (ic_proto_enabled && !able)
				continue;
			oflags = dev->flags;
			if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
				pr_err("IP-Config: Failed to open %s\n",
				       dev->name);
				continue;
			}
			if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
				rtnl_unlock();
				return -ENOMEM;
			}
			d->dev = dev;
			*last = d;
			last = &d->next;
			d->flags = oflags;
			d->able = able;
			if (able & IC_BOOTP)
				get_random_bytes(&d->xid, sizeof(__be32));
			else
				d->xid = 0;
			ic_proto_have_if |= able;
			pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n",
				 dev->name, able, d->xid);
		}
	}

	/* no point in waiting if we could not bring up at least one device */
	if (!ic_first_dev)
		goto have_carrier;

	/* wait for a carrier on at least one device */
	start = jiffies;
	next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
	while (time_before(jiffies, start +
			   msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) {
		int wait, elapsed;

		for_each_netdev(&init_net, dev)
			if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
				goto have_carrier;

		msleep(1);

		if (time_before(jiffies, next_msg))
			continue;

		elapsed = jiffies_to_msecs(jiffies - start);
		wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
		pr_info("Waiting up to %d more seconds for network.\n", wait);
		next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
	}
have_carrier:
	rtnl_unlock();

	*last = NULL;

	if (!ic_first_dev) {
		if (user_dev_name[0])
			pr_err("IP-Config: Device `%s' not found\n",
			       user_dev_name);
		else
			pr_err("IP-Config: No network devices available\n");
		return -ENODEV;
	}
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)22849.03%521.74%


Paul Gortmaker6213.33%14.35%


Micha Nelissen4910.54%14.35%


Linus Torvalds337.10%28.70%


Eric W. Biedermann255.38%28.70%


Hideaki Yoshifuji / 吉藤英明183.87%14.35%


Gerlando Falauto91.94%14.35%


Joe Perches71.51%14.35%


Florian Fainelli71.51%14.35%


François-Xavier Le Bail51.08%14.35%


Bastian Stender51.08%14.35%


Himangi Saraogi51.08%14.35%


Pavel Emelyanov40.86%14.35%


Stephen Hemminger30.65%14.35%


David S. Miller20.43%14.35%


Daniel Lezcano20.43%14.35%


Al Viro10.22%14.35%


Total465100.00%23100.00%






static void __init ic_close_devs(void)
{
	struct ic_device *d, *next;
	struct net_device *dev;

	rtnl_lock();
	next = ic_first_dev;
	while ((d = next)) {
		next = d->next;
		dev = d->dev;
		if (d != ic_dev && !netdev_uses_dsa(dev)) {
			pr_debug("IP-Config: Downing %s\n", dev->name);
			dev_change_flags(dev, d->flags);
		}
		kfree(d);
	}
	rtnl_unlock();
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)8087.91%555.56%


Florian Fainelli66.59%111.11%


Bastian Stender22.20%111.11%


Stephen Hemminger22.20%111.11%


Mark Rutland11.10%111.11%


Total91100.00%9100.00%



/*
 *      Interface to various network functions.
 */



static inline void

set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
{
	sin->sin_family = AF_INET;
	sin->sin_addr.s_addr = addr;
	sin->sin_port = port;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3694.74%150.00%


Al Viro25.26%150.00%


Total38100.00%2100.00%






static int __init ic_devinet_ioctl(unsigned int cmd, struct ifreq *arg)
{
	int res;

	mm_segment_t oldfs = get_fs();
	set_fs(get_ds());
	res = devinet_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
	set_fs(oldfs);
	return res;
}


Contributors
PersonTokensPropCommitsCommitProp
Chris Friesen57100.00%1100.00%


Total57100.00%1100.00%






static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
{
	int res;

	mm_segment_t oldfs = get_fs();
	set_fs(get_ds());
	res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
	set_fs(oldfs);
	return res;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4782.46%240.00%


Stephen Hemminger610.53%120.00%


Denis V. Lunev35.26%120.00%


Chris Friesen11.75%120.00%


Total57100.00%5100.00%






static int __init ic_route_ioctl(unsigned int cmd, struct rtentry *arg)
{
	int res;

	mm_segment_t oldfs = get_fs();
	set_fs(get_ds());
	res = ip_rt_ioctl(&init_net, cmd, (void __user *) arg);
	set_fs(oldfs);
	return res;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4885.71%250.00%


Stephen Hemminger58.93%125.00%


Denis V. Lunev35.36%125.00%


Total56100.00%4100.00%



/*
 *      Set up interface addresses and routes.
 */




static int __init ic_setup_if(void)
{
	struct ifreq ir;
	struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr;
	int err;

	memset(&ir, 0, sizeof(ir));
	strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name);
	set_sockaddr(sin, ic_myaddr, 0);
	if ((err = ic_devinet_ioctl(SIOCSIFADDR, &ir)) < 0) {
		pr_err("IP-Config: Unable to set interface address (%d)\n",
		       err);
		return -1;
	}
	set_sockaddr(sin, ic_netmask, 0);
	if ((err = ic_devinet_ioctl(SIOCSIFNETMASK, &ir)) < 0) {
		pr_err("IP-Config: Unable to set interface netmask (%d)\n",
		       err);
		return -1;
	}
	set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0);
	if ((err = ic_devinet_ioctl(SIOCSIFBRDADDR, &ir)) < 0) {
		pr_err("IP-Config: Unable to set interface broadcast address (%d)\n",
		       err);
		return -1;
	}
	/* Handle the case where we need non-standard MTU on the boot link (a network
         * using jumbo frames, for instance).  If we can't set the mtu, don't error
         * out, we'll try to muddle along.
         */
	if (ic_dev_mtu != 0) {
		strcpy(ir.ifr_name, ic_dev->dev->name);
		ir.ifr_mtu = ic_dev_mtu;
		if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
			pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
			       ic_dev_mtu, err);
	}
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)16972.53%240.00%


Chris Friesen5222.32%120.00%


Joe Perches83.43%120.00%


Uwe Kleine-König41.72%120.00%


Total233100.00%5100.00%






static int __init ic_setup_routes(void)
{
	/* No need to setup device routes, only the default route... */

	if (ic_gateway != NONE) {
		struct rtentry rm;
		int err;

		memset(&rm, 0, sizeof(rm));
		if ((ic_gateway ^ ic_myaddr) & ic_netmask) {
			pr_err("IP-Config: Gateway not on directly connected network\n");
			return -1;
		}
		set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0);
		set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0);
		set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0);
		rm.rt_flags = RTF_UP | RTF_GATEWAY;
		if ((err = ic_route_ioctl(SIOCADDRT, &rm)) < 0) {
			pr_err("IP-Config: Cannot add default route (%d)\n",
			       err);
			return -1;
		}
	}

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)14596.67%250.00%


Joe Perches42.67%125.00%


Al Viro10.67%125.00%


Total150100.00%4100.00%



/*
 *      Fill in default values for all missing parameters.
 */




static int __init ic_defaults(void)
{
	/*
         *      At this point we have no userspace running so need not
         *      claim locks on system_utsname
         */

	if (!ic_host_name_set)
		sprintf(init_utsname()->nodename, "%pI4", &ic_myaddr);

	if (root_server_addr == NONE)
		root_server_addr = ic_servaddr;

	if (ic_netmask == NONE) {
		if (IN_CLASSA(ntohl(ic_myaddr)))
			ic_netmask = htonl(IN_CLASSA_NET);
		else if (IN_CLASSB(ntohl(ic_myaddr)))
			ic_netmask = htonl(IN_CLASSB_NET);
		else if (IN_CLASSC(ntohl(ic_myaddr)))
			ic_netmask = htonl(IN_CLASSC_NET);
		else {
			pr_err("IP-Config: Unable to guess netmask for address %pI4\n",
			       &ic_myaddr);
			return -1;
		}
		pr_notice("IP-Config: Guessing netmask %pI4\n",
			  &ic_netmask);
	}

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)10785.60%436.36%


Harvey Harrison64.80%19.09%


Hideaki Yoshifuji / 吉藤英明32.40%19.09%


Serge E. Hallyn32.40%19.09%


Al Viro21.60%19.09%


Linus Torvalds21.60%19.09%


Joe Perches10.80%19.09%


Bastian Stender10.80%19.09%


Total125100.00%11100.00%



/*
 *      RARP support.
 */

#ifdef IPCONFIG_RARP

static int ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);


static struct packet_type rarp_packet_type __initdata = {
	.type =	cpu_to_be16(ETH_P_RARP),
	.func =	ic_rarp_recv,
};




static inline void __init ic_rarp_init(void)
{
	dev_add_pack(&rarp_packet_type);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1593.75%266.67%


Sam Ravnborg16.25%133.33%


Total16100.00%3100.00%






static inline void __init ic_rarp_cleanup(void)
{
	dev_remove_pack(&rarp_packet_type);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1593.75%266.67%


Sam Ravnborg16.25%133.33%


Total16100.00%3100.00%



/*
 *  Process received RARP packet.
 */


static int __init

ic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
{
	struct arphdr *rarp;
	unsigned char *rarp_ptr;
	__be32 sip, tip;
	unsigned char *tha;		/* t for "target" */
	struct ic_device *d;

	if (!net_eq(dev_net(dev), &init_net))
		goto drop;

	skb = skb_share_check(skb, GFP_ATOMIC);
	if (!skb)
		return NET_RX_DROP;

	if (!pskb_may_pull(skb, sizeof(struct arphdr)))
		goto drop;

	/* Basic sanity checks can be done without the lock.  */
	rarp = (struct arphdr *)skb_transport_header(skb);

	/* 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))
		goto drop;

	/* If it's not Ethernet, delete it. */
	if (rarp->ar_pro != htons(ETH_P_IP))
		goto drop;

	if (!pskb_may_pull(skb, arp_hdr_len(dev)))
		goto drop;

	/* OK, it is all there and looks valid, process... */
	rarp = (struct arphdr *)skb_transport_header(skb);
	rarp_ptr = (unsigned char *) (rarp + 1);

	/* 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_unlock;

	/* 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_unlock;	/* should never happen */

	/* Extract variable-width fields */
	rarp_ptr += dev->addr_len;
	memcpy(&sip, rarp_ptr, 4);
	rarp_ptr += 4;
	tha = rarp_ptr;
	rarp_ptr += dev->addr_len;
	memcpy(&tip, rarp_ptr, 4);

	/* Discard packets which are not meant for us. */
	if (memcmp(tha, dev->dev_addr, dev->addr_len))
		goto drop_unlock;

	/* Discard packets which are not from specified server. */
	if (ic_servaddr != NONE && ic_servaddr != sip)
		goto drop_unlock;

	/* We have a winner! */
	ic_dev = d;
	if (ic_myaddr == NONE)
		ic_myaddr = tip;
	ic_servaddr = sip;
	ic_addrservaddr = sip;
	ic_got_reply = IC_RARP;

drop_unlock:
	/* Show's over.  Nothing to see here.  */
	spin_unlock(&ic_recv_lock);

drop:
	/* Throw the packet out. */
	kfree_skb(skb);
	return 0;
}



Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)19551.32%420.00%


David S. Miller12532.89%315.00%


Linus Torvalds215.53%210.00%


Hideaki Yoshifuji / 吉藤英明102.63%315.00%


Eric W. Biedermann71.84%15.00%


Arnaldo Carvalho de Melo61.58%15.00%


Ian Morris51.32%15.00%


Philippe De Muyter41.05%15.00%


Al Viro30.79%15.00%


Pavel Emelyanov20.53%15.00%


Fabian Frederick10.26%15.00%


Uwe Kleine-König10.26%15.00%


Total380100.00%20100.00%



/*
 *  Send RARP request packet over a single interface.
 */



static void __init ic_rarp_send_if(struct ic_device *d)
{
	struct net_device *dev = d->dev;
	arp_send(ARPOP_RREQUEST, ETH_P_RARP, 0, dev, 0, NULL,
		 dev->dev_addr, dev->dev_addr);
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4295.45%375.00%


Linus Torvalds24.55%125.00%


Total44100.00%4100.00%



#endif

/*
 *  Predefine Nameservers
 */



static inline void __init ic_nameservers_predef(void)
{
	int i;

	for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
		ic_nameservers[i] = NONE;
}


Contributors
PersonTokensPropCommitsCommitProp
Andy Shevchenko33100.00%1100.00%


Total33100.00%1100.00%



/*
 *      DHCP/BOOTP support.
 */

#ifdef IPCONFIG_BOOTP


struct bootp_pkt {		/* BOOTP packet format */
	
struct iphdr iph;	/* IP header */
	
struct udphdr udph;	/* UDP header */
	
u8 op;			/* 1=request, 2=reply */
	
u8 htype;		/* HW address type */
	
u8 hlen;		/* HW address length */
	
u8 hops;		/* Used only by gateways */
	
__be32 xid;		/* Transaction ID */
	
__be16 secs;		/* Seconds since we started */
	
__be16 flags;		/* Just what it says */
	
__be32 client_ip;		/* Client's IP address if known */
	
__be32 your_ip;		/* Assigned IP address */
	
__be32 server_ip;		/* (Next, e.g. NFS) Server's IP address */
	
__be32 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 exten[312];		/* DHCP options / BOOTP vendor extensions */
};

/* 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, struct net_device *orig_dev);


static struct packet_type bootp_packet_type __initdata = {
	.type =	cpu_to_be16(ETH_P_IP),
	.func =	ic_bootp_recv,
};

/*
 *  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, struct ic_device *d)
{
	u8 mt = ((ic_servaddr == NONE)
		 ? DHCPDISCOVER : DHCPREQUEST);
	u8 *e = options;
	int len;

	pr_debug("DHCP: Sending message type %d (%s)\n", mt, d->dev->name);

	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 */
			26,	/* MTU */
			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);

		if (ic_host_name_set) {
			*e++ = 12;	/* host-name */
			len = strlen(utsname()->nodename);
			*e++ = len;
			memcpy(e, utsname()->nodename, len);
			e += len;
		}
		if (*vendor_class_identifier) {
			pr_info("DHCP: sending class identifier \"%s\"\n",
				vendor_class_identifier);
			*e++ = 60;	/* Class-identifier */
			len = strlen(vendor_class_identifier);
			*e++ = len;
			memcpy(e, vendor_class_identifier, len);
			e += len;
		}
		len = strlen(dhcp_client_identifier + 1);
		/* the minimum length of identifier is 2, include 1 byte type,
                 * and can not be larger than the length of options
                 */
		if (len >= 1 && len < 312 - (e - options) - 1) {
			*e++ = 61;
			*e++ = len + 1;
			memcpy(e, dhcp_client_identifier, len + 1);
			e += len + 1;
		}
	}

	*e++ = 255;	/* End of the list */
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds17947.23%19.09%


Li RongQing6116.09%19.09%


Rainer Jochem4912.93%19.09%


Fengguang Wu4511.87%19.09%


Linus Torvalds (pre-git)277.12%218.18%


Uwe Kleine-König123.17%19.09%


Chris Friesen30.79%19.09%


Joe Perches10.26%19.09%


Al Viro10.26%19.09%


Bastian Stender10.26%19.09%


Total379100.00%11100.00%



#endif /* IPCONFIG_DHCP */




static void __init ic_bootp_init_ext(u8 *e)
{
	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 request */
	*e++ = 8;
	e += 8;
	*e++ = 12;		/* Host name request */
	*e++ = 32;
	e += 32;
	*e++ = 40;		/* NIS Domain name request */
	*e++ = 32;
	e += 32;
	*e++ = 17;		/* Boot path */
	*e++ = 40;
	e += 40;

	*e++ = 57;		/* set extension buffer size for reply */
	*e++ = 2;
	*e++ = 1;		/* 128+236+8+20+14, see dhcpd sources */
	*e++ = 150;

	*e++ = 255;		/* End of the list */
}



Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)9156.88%240.00%


Linus Torvalds6842.50%240.00%


Steven Cole10.62%120.00%


Total160100.00%5100.00%



/*
 *  Initialize the DHCP/BOOTP mechanism.
 */



static inline void __init ic_bootp_init(void)
{
	ic_nameservers_predef();

	dev_add_pack(&bootp_packet_type);
}



Contributors
PersonTokensPropCommitsCommitProp
Christoph Fritz1263.16%133.33%


Linus Torvalds (pre-git)736.84%266.67%


Total19100.00%3100.00%



/*
 *  DHCP/BOOTP cleanup.
 */



static inline void __init ic_bootp_cleanup(void)
{
	dev_remove_pack(&bootp_packet_type);
}



Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1593.75%266.67%


Sam Ravnborg16.25%133.33%


Total16100.00%3100.00%



/*
 *  Send DHCP/BOOTP request to single interface.
 */



static void __init ic_bootp_send_if(struct ic_device *d, unsigned long jiffies_diff)
{
	struct net_device *dev = d->dev;
	struct sk_buff *skb;
	struct bootp_pkt *b;
	struct iphdr *h;
	int hlen = LL_RESERVED_SPACE(dev);
	int tlen = dev->needed_tailroom;

	/* Allocate packet */
	skb = alloc_skb(sizeof(struct bootp_pkt) + hlen + tlen + 15,
			GFP_KERNEL);
	if (!skb)
		return;
	skb_reserve(skb, hlen);
	b = (struct bootp_pkt *) skb_put(skb, sizeof(struct bootp_pkt));
	memset(b, 0, sizeof(struct bootp_pkt));

	/* Construct IP header */
	skb_reset_network_header(skb);
	h = ip_hdr(skb);
	h->version = 4;
	h->ihl = 5;
	h->tot_len = htons(sizeof(struct bootp_pkt));
	h->frag_off = htons(IP_DF);
	h->ttl = 64;
	h->protocol = IPPROTO_UDP;
	h->daddr = htonl(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.len = htons(sizeof(struct bootp_pkt) - sizeof(struct iphdr));
	/* UDP checksum not calculated -- explicitly allowed in BOOTP RFC */

	/* Construct DHCP/BOOTP header */
	b->op = BOOTP_REQUEST;
	if (dev->type < 256) /* check for false types */
		b->htype = dev->type;
	else if (dev->type == ARPHRD_FDDI)
		b->htype = ARPHRD_ETHER;
	else {
		pr_warn("Unknown ARP type 0x%04x for device %s\n", dev->type,
			dev->name);
		b->htype = dev->type; /* can cause undefined behavior */
	}

	/* server_ip and your_ip address are both already zero per RFC2131 */
	b->hlen = dev->addr_len;
	memcpy(b->hw_addr, dev->dev_addr, dev->addr_len);
	b->secs = htons(jiffies_diff / HZ);
	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, d);
	else
#endif
		ic_bootp_init_ext(b->exten);

	/* Chain packet down the line... */
	skb->dev = dev;
	skb->protocol = htons(ETH_P_IP);
	if (dev_hard_header(skb, dev, ntohs(skb->protocol),
			    dev->broadcast, dev->dev_addr, skb->len) < 0) {
		kfree_skb(skb);
		printk("E");
		return;
	}

	if (dev_queue_xmit(skb) < 0)
		printk("E");
}



Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)36779.96%527.78%


Linus Torvalds296.32%211.11%


Herbert Xu194.14%15.56%


Li RongQing163.49%15.56%


Maciej W. Rozycki81.74%15.56%


Arnaldo Carvalho de Melo81.74%211.11%


Hideaki Yoshifuji / 吉藤英明40.87%15.56%


Al Viro30.65%15.56%


Uwe Kleine-König20.44%15.56%


Stephen Hemminger20.44%211.11%


Bastian Stender10.22%15.56%


Total459100.00%18100.00%



/*
 *  Copy BOOTP-supplied string if not already set.
 */



static int __init ic_bootp_string(char *dest, char *src, int len, int max)
{
	if (!len)
		return 0;
	if (len > max-1)
		len = max-1;
	memcpy(dest, src, len);
	dest[len] = '\0';
	return 1;
}



Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)6198.39%266.67%


Linus Torvalds11.61%133.33%


Total62100.00%3100.00%



/*
 *  Process BOOTP extensions.
 */



static void __init ic_do_bootp_ext(u8 *ext)
{
	u8 servers;
	int i;
	__be16 mtu;

	u8 *c;

	pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
	for (c=ext+2; c<ext+2+ext[1]; c++)
		pr_debug(" %02x", *c);
	pr_debug("\n");

	switch (*ext++) {
	case 1:		/* Subnet mask */
		if (ic_netmask == NONE)
			memcpy(&ic_netmask, ext+1, 4);
		break;
	case 3:		/* Default gateway */
		if (ic_gateway == NONE)
			memcpy(&ic_gateway, ext+1, 4);
		break;
	case 6:		/* DNS server */
		servers= *ext/4;
		if (servers > CONF_NAMESERVERS_MAX)
			servers = CONF_NAMESERVERS_MAX;
		for (i = 0; i < servers; i++) {
			if (ic_nameservers[i] == NONE)
				memcpy(&ic_nameservers[i], ext+1+4*i, 4);
		}
		break;
	case 12:	/* Host name */
		ic_bootp_string(utsname()->nodename, ext+1, *ext,
				__NEW_UTS_LEN);
		ic_host_name_set = 1;
		break;
	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 26:	/* Interface MTU */
		memcpy(&mtu, ext+1, sizeof(mtu));
		ic_dev_mtu = ntohs(mtu);
		break;
	case 40:	/* NIS Domain name (_not_ DNS) */
		ic_bootp_string(utsname()->domainname, ext+1, *ext,
				__NEW_UTS_LEN);
		break;
	}
}



Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)17355.27%222.22%


Josef Siemes5015.97%111.11%


Linus Torvalds4815.34%111.11%


Chris Friesen299.27%111.11%


Serge E. Hallyn61.92%111.11%


Bastian Stender30.96%111.11%


Al Viro30.96%111.11%


Eric Dumazet10.32%111.11%


Total313100.00%9100.00%



/*
 *  Receive BOOTP reply.
 */



static int __init ic_bootp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
{
	struct bootp_pkt *b;
	struct iphdr *h;
	struct ic_device *d;
	int len, ext_len;

	if (!net_eq(dev_net(dev), &init_net))
		goto drop;

	/* Perform verifications before taking the lock.  */
	if (skb->pkt_type == PACKET_OTHERHOST)
		goto drop;

	skb = skb_share_check(skb, GFP_ATOMIC);
	if (!skb)
		return NET_RX_DROP;

	if (!pskb_may_pull(skb,
			   sizeof(struct iphdr) +
			   sizeof(struct udphdr)))
		goto drop;

	b = (struct bootp_pkt *)skb_network_header(skb);
	h = &b->iph;

	if (h->ihl != 5 || h->version != 4 || h->protocol != IPPROTO_UDP)
		goto drop;

	/* Fragments are not supported */
	if (ip_is_fragment(h)) {
		net_err_ratelimited("DHCP/BOOTP: Ignoring fragmented reply\n");
		goto drop;
	}

	if (skb->len < ntohs(h->tot_len))
		goto drop;

	if (ip_fast_csum((char *) h, h->ihl))
		goto drop;

	if (b->udph.source != htons(67) || b->udph.dest != htons(68))
		goto drop;

	if (ntohs(h->tot_len) < ntohs(b->udph.len) + sizeof(struct iphdr))
		goto drop;

	len = ntohs(b->udph.len) - sizeof(struct udphdr);
	ext_len = len - (sizeof(*b) -
			 sizeof(struct iphdr) -
			 sizeof(struct udphdr) -
			 sizeof(b->exten));
	if (ext_len < 0)
		goto drop;

	/* Ok the front looks good, make sure we can get at the rest.  */
	if (!pskb_may_pull(skb, skb->len))
		goto drop;

	b = (struct bootp_pkt *)skb_network_header(skb);
	h = &b->iph;

	/* 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_unlock;

	/* 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_unlock;  /* should never happen */

	/* Is it a reply to our BOOTP request? */
	if (b->op != BOOTP_REPLY ||
	    b->xid != d->xid) {
		net_err_ratelimited("DHCP/BOOTP: Reply not for us on %s, op[%x] xid[%x]\n",
				    d->dev->name, b->op, b->xid);
		goto drop_unlock;
	}

	/* Parse extensions */
	if (ext_len >= 4 &&
	    !memcmp(b->exten, ic_bootp_cookie, 4)) { /* Check magic cookie */
		u8 *end = (u8 *) b + ntohs(b->iph.tot_len);
		u8 *ext;

#ifdef IPCONFIG_DHCP
		if (ic_proto_enabled & IC_USE_DHCP) {
			__be32 server_id = NONE;
			int mt = 0;

			ext = &b->exten[4];
			while (ext < end && *ext != 0xff) {
				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;
				}
			}

			pr_debug("DHCP: Got message type %d (%s)\n", mt, d->dev->name);

			switch (mt) {
			case DHCPOFFER:
				/* While in the process of accepting one offer,
                                 * ignore all others.
                                 */
				if (ic_myaddr != NONE)
					goto drop_unlock;

				/* Let's accept that offer. */
				ic_myaddr = b->your_ip;
				ic_servaddr = server_id;
				pr_debug("DHCP: Offered address %pI4 by server %pI4\n",
					 &ic_myaddr, &b->iph.saddr);
				/* The DHCP indicated server address takes
                                 * precedence over the bootp header one if
                                 * they are different.
                                 */
				if ((server_id != NONE) &&
				    (b->server_ip != server_id))
					b->server_ip = ic_servaddr;
				break;

			case DHCPACK:
				if (memcmp(dev->dev_addr, b->hw_addr, dev->addr_len) != 0)
					goto drop_unlock;

				/* Yeah! */
				break;

			default:
				/* Urque.  Forget it*/
				ic_myaddr = NONE;
				ic_servaddr = NONE;
				goto drop_unlock;
			}

			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 = d;
	ic_myaddr = b->your_ip;
	ic_servaddr = b->server_ip;
	ic_addrservaddr = b->iph.saddr;
	if (ic_gateway == NONE && b->relay_ip)
		ic_gateway = b->relay_ip;
	if (ic_nameservers[0] == NONE)
		ic_nameservers[0] = ic_servaddr;
	ic_got_reply = IC_BOOTP;

drop_unlock:
	/* Show's over.  Nothing to see here.  */
	spin_unlock(&ic_recv_lock);

drop:
	/* Throw the packet out. */
	kfree_skb(skb);

	return 0;
}



Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds32536.93%413.33%


David S. Miller24127.39%413.33%


Linus Torvalds (pre-git)20823.64%413.33%


Peter Buckingham222.50%26.67%


Uwe Kleine-König151.70%26.67%


Philippe De Muyter131.48%13.33%


Hideaki Yoshifuji / 吉藤英明101.14%310.00%


Eric W. Biedermann91.02%13.33%


Al Viro80.91%13.33%


Josef Siemes80.91%13.33%


Arnaldo Carvalho de Melo60.68%13.33%


Ian Morris50.57%13.33%


Harvey Harrison30.34%13.33%


Joe Perches30.34%26.67%


Paul Gortmaker20.23%13.33%


Bastian Stender20.23%13.33%


Total880100.00%30100.00%



#endif


/*
 *      Dynamic IP configuration -- DHCP, BOOTP, RARP.
 */

#ifdef IPCONFIG_DYNAMIC




static int __init ic_dynamic(void)
{
	int retries;
	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 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) {
		pr_err("IP-Config: Incomplete network configuration information\n");
		return -1;
	}

#ifdef IPCONFIG_BOOTP
	if ((ic_proto_enabled ^ ic_proto_have_if) & IC_BOOTP)
		pr_err("DHCP/BOOTP: No suitable device found\n");
#endif
#ifdef IPCONFIG_RARP
	if ((ic_proto_enabled ^ ic_proto_have_if) & IC_RARP)
		pr_err("RARP: No suitable device found\n");
#endif

	if (!ic_proto_have_if)
		/* Error message already printed */
		return -1;

	/*
         * Setup protocols
         */
#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
         * seems to be a terrible waste of CPU time, but actually there is
         * only one process running at all, so we don't need to use any
         * scheduler functions.
         * [Actually we could now, but the nothing else running note still
         *  applies.. - AC]
         */
	pr_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;
	d = ic_first_dev;
	retries = CONF_SEND_RETRIES;
	get_random_bytes(&timeout, sizeof(timeout));
	timeout = CONF_BASE_TIMEOUT + (timeout % (unsigned int) CONF_TIMEOUT_RANDOM);
	for (;;) {
#ifdef IPCONFIG_BOOTP
		if (do_bootp && (d->able & IC_BOOTP))
			ic_bootp_send_if(d, jiffies - start_jiffies);
#endif
#ifdef IPCONFIG_RARP
		if (do_rarp && (d->able & IC_RARP))
			ic_rarp_send_if(d);
#endif

		if (!d->next) {
			jiff = jiffies + timeout;
			while (time_before(jiffies, jiff) && !ic_got_reply)
				schedule_timeout_uninterruptible(1);
		}
#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;
			/* continue on device that got the reply */
			d = ic_dev;
			pr_cont(",");
			continue;
		}
#endif /* IPCONFIG_DHCP */

		if (ic_got_reply) {
			pr_cont(" OK\n");
			break;
		}

		if ((d = d->next))
			continue;

		if (! --retries) {
			pr_cont(" timed out!\n");
			break;
		}

		d = ic_first_dev;

		timeout = timeout CONF_TIMEOUT_MULT;
		if (timeout > CONF_TIMEOUT_MAX)
			timeout = CONF_TIMEOUT_MAX;

		pr_cont(".");
	}

#ifdef IPCONFIG_BOOTP
	if (do_bootp)
		ic_bootp_cleanup();
#endif
#ifdef IPCONFIG_RARP
	if (do_rarp)
		ic_rarp_cleanup();
#endif

	if (!ic_got_reply) {
		ic_myaddr = NONE;
		return -1;
	}

	pr_info("IP-Config: Got %s answer from %pI4, my address is %pI4\n",
		((ic_got_reply & IC_RARP) ? "RARP"
		: (ic_proto_enabled & IC_USE_DHCP) ? "DHCP" : "BOOTP"),
		&ic_addrservaddr, &ic_myaddr);

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)28260.13%210.53%


Linus Torvalds14230.28%315.79%


Uwe Kleine-König142.99%210.53%


Joe Perches71.49%15.26%


Maxime Bizon51.07%15.26%


Geert Uytterhoeven51.07%15.26%


Magnus Damm30.64%15.26%


David S. Miller30.64%15.26%


Harvey Harrison20.43%15.26%


Eric Dumazet10.21%15.26%


Al Viro10.21%15.26%


Philippe De Muyter10.21%15.26%


Nishanth Aravamudan10.21%15.26%


Bastian Stender10.21%15.26%


Hideaki Yoshifuji / 吉藤英明10.21%15.26%


Total469100.00%19100.00%



#endif /* IPCONFIG_DYNAMIC */

#ifdef CONFIG_PROC_FS




static int pnp_seq_show(struct seq_file *seq, void *v)
{
	int i;

	if (ic_proto_used & IC_PROTO)
		seq_printf(seq, "#PROTO: %s\n",
			   (ic_proto_used & IC_RARP) ? "RARP"
			   : (ic_proto_used & IC_USE_DHCP) ? "DHCP" : "BOOTP");
	else
		seq_puts(seq, "#MANUAL\n");

	if (ic_domain[0])
		seq_printf(seq,
			   "domain %s\n", ic_domain);
	for (i = 0; i < CONF_NAMESERVERS_MAX; i++) {
		if (ic_nameservers[i] != NONE)
			seq_printf(seq, "nameserver %pI4\n",
				   &ic_nameservers[i]);
	}
	if (ic_servaddr != NONE)
		seq_printf(seq, "bootserver %pI4\n",
			   &ic_servaddr);
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds7054.26%116.67%


Josef Siemes2519.38%116.67%


Hideaki Yoshifuji / 吉藤英明1914.73%116.67%


Lode Leroy96.98%116.67%


Harvey Harrison43.10%116.67%


Al Viro21.55%116.67%


Total129100.00%6100.00%






static int pnp_seq_open(struct inode *indoe, struct file *file)
{
	return single_open(file, pnp_seq_show, NULL);
}


Contributors
PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明2492.31%150.00%


Linus Torvalds27.69%150.00%


Total26100.00%2100.00%




static const struct file_operations pnp_seq_fops = {
	.owner		= THIS_MODULE,
	.open		= pnp_seq_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};
#endif /* CONFIG_PROC_FS */

/*
 *  Extract IP address from the parameter string if needed. Note that we
 *  need to have root_server_addr set _before_ IPConfig gets called as it
 *  can override it.
 */



__be32 __init root_nfs_parse_addr(char *name)
{
	__be32 addr;
	int octets = 0;
	char *cp, *cq;

	cp = cq = name;
	while (octets < 4) {
		while (*cp >= '0' && *cp <= '9')
			cp++;
		if (cp == cq || cp - cq > 3)
			break;
		if (*cp == '.' || octets == 3)
			octets++;
		if (octets < 4)
			cp++;
		cq = cp;
	}
	if (octets == 4 && (*cp == ':' || *cp == '\0')) {
		if (*cp == ':')
			*cp++ = '\0';
		addr = in_aton(name);
		memmove(name, cp, strlen(cp) + 1);
	} else
		addr = NONE;

	return addr;
}


Contributors
PersonTokensPropCommitsCommitProp
Trond Myklebust14592.95%133.33%


Matthew Wilcox85.13%133.33%


Al Viro31.92%133.33%


Total156100.00%3100.00%




#define DEVICE_WAIT_MAX		12 
/* 12 seconds */




static int __init wait_for_devices(void)
{
	int i;

	for (i = 0; i < DEVICE_WAIT_MAX; i++) {
		struct net_device *dev;
		int found = 0;

		rtnl_lock();
		for_each_netdev(&init_net, dev) {
			if (ic_is_init_dev(dev)) {
				found = 1;
				break;
			}
		}
		rtnl_unlock();
		if (found)
			return 0;
		ssleep(1);
	}
	return -ENODEV;
}


Contributors
PersonTokensPropCommitsCommitProp
David S. Miller8098.77%150.00%


Micha Nelissen11.23%150.00%


Total81100.00%2100.00%



/*
 *      IP Autoconfig dispatcher.
 */




static int __init ip_auto_config(void)
{
	__be32 addr;
#ifdef IPCONFIG_DYNAMIC
	int retries = CONF_OPEN_RETRIES;
#endif
	int err;
	unsigned int i;

#ifdef CONFIG_PROC_FS
	proc_create("pnp", S_IRUGO, init_net.proc_net, &pnp_seq_fops);
#endif /* CONFIG_PROC_FS */

	if (!ic_enable)
		return 0;

	pr_debug("IP-Config: Entered.\n");
#ifdef IPCONFIG_DYNAMIC
 try_try_again:
#endif
	/* Wait for devices to appear */
	err = wait_for_devices();
	if (err)
		return err;

	/* Setup all network devices */
	err = ic_open_devs();
	if (err)
		return err;

	/* Give drivers a chance to settle */
	msleep(CONF_POST_OPEN);

	/*
         * 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
         * interfaces and no default was set), use BOOTP or RARP to get the
         * missing values.
         */
	if (ic_myaddr == NONE ||
#ifdef CONFIG_ROOT_NFS
	    (root_server_addr == NONE &&
	     ic_servaddr == NONE &&
	     ROOT_DEV == Root_NFS) ||
#endif
	    ic_first_dev->next) {
#ifdef IPCONFIG_DYNAMIC
		if (ic_dynamic() < 0) {
			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 ==  Root_NFS) {
				pr_err("IP-Config: Retrying forever (NFS root)...\n");
				goto try_try_again;
			}
#endif

			if (--retries) {
				pr_err("IP-Config: Reopening network devices...\n");
				goto try_try_again;
			}

			/* Oh, well.  At least we tried. */
			pr_err("IP-Config: Auto-configuration of network failed\n");
			return -1;
		}
#else /* !DYNAMIC */
		pr_err("IP-Config: Incomplete network configuration information\n");
		ic_close_devs();
		return -1;
#endif /* IPCONFIG_DYNAMIC */
	} else {
		/* Device selected manually or only one device -> use it */
		ic_dev = ic_first_dev;
	}

	addr = root_nfs_parse_addr(root_server_path);
	if (root_server_addr == NONE)
		root_server_addr = addr;

	/*
         * Use defaults wherever applicable.
         */
	if (ic_defaults() < 0)
		return -1;

	/*
         * 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.
         */
	pr_info("IP-Config: Complete:\n");

	pr_info("     device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
		ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr,
		&ic_myaddr, &ic_netmask, &ic_gateway);
	pr_info("     host=%s, domain=%s, nis-domain=%s\n",
		utsname()->nodename, ic_domain, utsname()->domainname);
	pr_info("     bootserver=%pI4, rootserver=%pI4, rootpath=%s",
		&ic_servaddr, &root_server_addr, root_server_path);
	if (ic_dev_mtu)
		pr_cont(", mtu=%d", ic_dev_mtu);
	for (i = 0; i < CONF_NAMESERVERS_MAX; i++)
		if (ic_nameservers[i] != NONE) {
			pr_cont("     nameserver%u=%pI4",
				i, &ic_nameservers[i]);
			break;
		}
	for (i++; i < CONF_NAMESERVERS_MAX; i++)
		if (ic_nameservers[i] != NONE)
			pr_cont(", nameserver%u=%pI4", i, &ic_nameservers[i]);
	pr_cont("\n");
#endif /* !SILENT */

	/*
         * Close all network devices except the device we've
         * autoconfigured and set up routes.
         */
	if (ic_setup_if() < 0 || ic_setup_routes() < 0)
		err = -1;
	else
		err = 0;

	ic_close_devs();

	return err;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)11725.60%412.50%


Linus Torvalds10623.19%26.25%


Christoph Fritz7015.32%13.12%


Uwe Kleine-König224.81%39.38%


David S. Miller214.60%13.12%


Trond Myklebust183.94%13.12%


Joe Perches132.84%13.12%


Thierry Reding122.63%13.12%


Benjamin Zores102.19%13.12%


Chris Friesen102.19%13.12%


Claudio Fontana91.97%13.12%


Al Viro71.53%26.25%


Serge E. Hallyn61.31%13.12%


Harvey Harrison51.09%13.12%


Frank Davis51.09%13.12%


Martin Fuzzey51.09%13.12%


Gao Feng51.09%13.12%


Joakim Tjernlund40.88%13.12%


Hideaki Yoshifuji / 吉藤英明30.66%13.12%


Geert Uytterhoeven30.66%13.12%


Chris Wright20.44%13.12%


Micha Nelissen10.22%13.12%


Magnus Damm10.22%13.12%


Lucas De Marchi10.22%13.12%


Bastian Stender10.22%13.12%


Total457100.00%32100.00%




late_initcall(ip_auto_config);


/*
 *  Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel
 *  command line parameter.  See Documentation/filesystems/nfs/nfsroot.txt.
 */



static int __init ic_proto_name(char *name)
{
	if (!strcmp(name, "on") || !strcmp(name, "any")) {
		return 1;
	}
	if (!strcmp(name, "off") || !strcmp(name, "none")) {
		return 0;
	}
#ifdef CONFIG_IP_PNP_DHCP
	else if (!strncmp(name, "dhcp", 4)) {
		char *client_id;

		ic_proto_enabled &= ~IC_RARP;
		client_id = strstr(name, "dhcp,");
		if (client_id) {
			char *v;

			client_id = client_id + 5;
			v = strchr(client_id, ',');
			if (!v)
				return 1;
			*v = 0;
			if (kstrtou8(client_id, 0, dhcp_client_identifier))
				pr_debug("DHCP: Invalid client identifier type\n");
			strncpy(dhcp_client_identifier + 1, v + 1, 251);
			*v = ',';
		}
		return 1;
	}
#endif
#ifdef CONFIG_IP_PNP_BOOTP
	else if (!strcmp(name, "bootp")) {
		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_USE_DHCP);
		return 1;
	}
#endif
#ifdef IPCONFIG_DYNAMIC
	else if (!strcmp(name, "both")) {
		ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
		return 1;
	}
#endif
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)10239.23%228.57%


Li RongQing8733.46%114.29%


Linus Torvalds4718.08%114.29%


Simon Horman228.46%114.29%


Bastian Stender10.38%114.29%


Amos Waterland10.38%114.29%


Total260100.00%7100.00%






static int __init ip_auto_config_setup(char *addrs)
{
	char *cp, *ip, *dp;
	int num = 0;

	ic_set_manually = 1;
	ic_enable = 1;

	/*
         * If any dhcp, bootp etc options are set, leave autoconfig on
         * and skip the below static IP processing.
         */
	if (ic_proto_name(addrs))
		return 1;

	/* If no static IP is given, turn off autoconfig and bail.  */
	if (*addrs == 0 ||
	    strcmp(addrs, "off") == 0 ||
	    strcmp(addrs, "none") == 0) {
		ic_enable = 0;
		return 1;
	}

	ic_nameservers_predef();

	/* Parse string for static IP assignment.  */
	ip = addrs;
	while (ip && *ip) {
		if ((cp = strchr(ip, ':')))
			*cp++ = '\0';
		if (strlen(ip) > 0) {
			pr_debug("IP-Config: Parameter #%d: `%s'\n", num, ip);
			switch (num) {
			case 0:
				if ((ic_myaddr = in_aton(ip)) == ANY)
					ic_myaddr = NONE;
				break;
			case 1:
				if ((ic_servaddr = in_aton(ip)) == ANY)
					ic_servaddr = NONE;
				break;
			case 2:
				if ((ic_gateway = in_aton(ip)) == ANY)
					ic_gateway = NONE;
				break;
			case 3:
				if ((ic_netmask = in_aton(ip)) == ANY)
					ic_netmask = NONE;
				break;
			case 4:
				if ((dp = strchr(ip, '.'))) {
					*dp++ = '\0';
					strlcpy(utsname()->domainname, dp,
						sizeof(utsname()->domainname));
				}
				strlcpy(utsname()->nodename, ip,
					sizeof(utsname()->nodename));
				ic_host_name_set = 1;
				break;
			case 5:
				strlcpy(user_dev_name, ip, sizeof(user_dev_name));
				break;
			case 6:
				if (ic_proto_name(ip) == 0 &&
				    ic_myaddr == NONE) {
					ic_enable = 0;
				}
				break;
			case 7:
				if (CONF_NAMESERVERS_MAX >= 1) {
					ic_nameservers[0] = in_aton(ip);
					if (ic_nameservers[0] == ANY)
						ic_nameservers[0] = NONE;
				}
				break;
			case 8:
				if (CONF_NAMESERVERS_MAX >= 2) {
					ic_nameservers[1] = in_aton(ip);
					if (ic_nameservers[1] == ANY)
						ic_nameservers[1] = NONE;
				}
				break;
			}
		}
		ip = cp;
		num++;
	}

	return 1;
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)24458.65%433.33%


Christoph Fritz7918.99%18.33%


Amos Waterland5112.26%18.33%


Benjamin Collins153.61%18.33%


Serge E. Hallyn122.88%18.33%


Al Viro81.92%216.67%


Simon Horman40.96%18.33%


Bastian Stender30.72%18.33%


Total416100.00%12100.00%



__setup("ip=", ip_auto_config_setup);




static int __init nfsaddrs_config_setup(char *addrs)
{
	return ip_auto_config_setup(addrs);
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)17100.00%2100.00%


Total17100.00%2100.00%



__setup("nfsaddrs=", nfsaddrs_config_setup);




static int __init vendor_class_identifier_setup(char *addrs)
{
	if (strlcpy(vendor_class_identifier, addrs,
		    sizeof(vendor_class_identifier))
	    >= sizeof(vendor_class_identifier))
		pr_warn("DHCP: vendorclass too long, truncated to \"%s\"\n",
			vendor_class_identifier);
	return 1;
}

Contributors
PersonTokensPropCommitsCommitProp
Rainer Jochem3895.00%133.33%


Bastian Stender12.50%133.33%


Joe Perches12.50%133.33%


Total40100.00%3100.00%



__setup("dhcpclass=", vendor_class_identifier_setup);

Overall Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)317545.40%1712.50%


Linus Torvalds133819.13%96.62%


David S. Miller5577.96%96.62%


Li RongQing1802.57%21.47%


Trond Myklebust1642.34%10.74%


Christoph Fritz1622.32%10.74%


Chris Friesen1582.26%10.74%


Hideaki Yoshifuji / 吉藤英明1281.83%64.41%


Rainer Jochem991.42%10.74%


Josef Siemes921.32%10.74%


Al Viro731.04%32.21%


Uwe Kleine-König711.02%53.68%


Micha Nelissen680.97%10.74%


Paul Gortmaker670.96%32.21%


Amos Waterland520.74%10.74%


Fengguang Wu450.64%10.74%


Joe Perches450.64%21.47%


Eric W. Biedermann440.63%42.94%


Andy Shevchenko340.49%10.74%


Serge E. Hallyn270.39%21.47%


Simon Horman260.37%21.47%


Arnaldo Carvalho de Melo260.37%42.94%


Harvey Harrison240.34%21.47%


Philippe De Muyter240.34%10.74%


Peter Buckingham220.31%21.47%


Bastian Stender220.31%10.74%


Herbert Xu190.27%10.74%


Stephen Hemminger180.26%42.94%


Benjamin Collins150.21%10.74%


Eldad Zack140.20%10.74%


Florian Fainelli130.19%10.74%


Thierry Reding120.17%10.74%


Arnd Bergmann110.16%10.74%


Benjamin Zores100.14%10.74%


Ian Morris100.14%10.74%


Adrian Bunk100.14%32.21%


Claudio Fontana90.13%10.74%


Lode Leroy90.13%10.74%


Gerlando Falauto90.13%10.74%


Rusty Russell90.13%21.47%


Maciej W. Rozycki80.11%10.74%


Matthew Wilcox80.11%10.74%


Geert Uytterhoeven80.11%10.74%


Denis V. Lunev60.09%21.47%


Pavel Emelyanov60.09%21.47%


Frank Davis50.07%10.74%


François-Xavier Le Bail50.07%10.74%


Himangi Saraogi50.07%10.74%


Martin Fuzzey50.07%10.74%


Maxime Bizon50.07%10.74%


Gao Feng50.07%10.74%


Joakim Tjernlund40.06%10.74%


Nishanth Aravamudan40.06%21.47%


Thomas Gleixner40.06%10.74%


Magnus Damm40.06%10.74%


Tejun Heo30.04%10.74%


Sam Ravnborg30.04%10.74%


Chris Wright20.03%10.74%


Daniel Lezcano20.03%10.74%


Eric Dumazet20.03%21.47%


Thiemo Seufer10.01%10.74%


Ben Dooks10.01%10.74%


J. Bruce Fields10.01%10.74%


Steven Cole10.01%10.74%


Lucas De Marchi10.01%10.74%


David Woodhouse10.01%10.74%


Mark Rutland10.01%10.74%


Arjan van de Ven10.01%10.74%


Fabian Frederick10.01%10.74%


Andrew Morton0.00%00.00%


Total6994100.00%136100.00%


Directory: net/ipv4



Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.