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1831 lines
43 KiB
1831 lines
43 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Automatic Configuration of IP -- use DHCP, BOOTP, RARP, or |
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* user-supplied information to configure own IP address and routes. |
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* |
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* Copyright (C) 1996-1998 Martin Mares <[email protected]> |
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* |
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* Derived from network configuration code in fs/nfs/nfsroot.c, |
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* originally Copyright (C) 1995, 1996 Gero Kuhlmann and me. |
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* |
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* BOOTP rewritten to construct and analyse packets itself instead |
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* of misusing the IP layer. num_bugs_causing_wrong_arp_replies--; |
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* -- MJ, December 1998 |
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* |
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* Fixed ip_auto_config_setup calling at startup in the new "Linker Magic" |
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* initialization scheme. |
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* - Arnaldo Carvalho de Melo <[email protected]>, 08/11/1999 |
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* |
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* DHCP support added. To users this looks like a whole separate |
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* protocol, but we know it's just a bag on the side of BOOTP. |
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* -- Chip Salzenberg <[email protected]>, May 2000 |
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* |
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* Ported DHCP support from 2.2.16 to 2.4.0-test4 |
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* -- Eric Biederman <[email protected]>, 30 Aug 2000 |
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* |
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* Merged changes from 2.2.19 into 2.4.3 |
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* -- Eric Biederman <[email protected]>, 22 April Aug 2001 |
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* |
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* Multiple Nameservers in /proc/net/pnp |
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* -- Josef Siemes <[email protected]>, Aug 2002 |
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* |
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* NTP servers in /proc/net/ipconfig/ntp_servers |
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* -- Chris Novakovic <[email protected]>, April 2018 |
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*/ |
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|
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#include <linux/types.h> |
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#include <linux/string.h> |
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#include <linux/kernel.h> |
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#include <linux/jiffies.h> |
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#include <linux/random.h> |
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#include <linux/init.h> |
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#include <linux/utsname.h> |
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#include <linux/in.h> |
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#include <linux/if.h> |
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#include <linux/inet.h> |
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#include <linux/inetdevice.h> |
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#include <linux/netdevice.h> |
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#include <linux/if_arp.h> |
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#include <linux/skbuff.h> |
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#include <linux/ip.h> |
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#include <linux/socket.h> |
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#include <linux/route.h> |
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#include <linux/udp.h> |
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#include <linux/proc_fs.h> |
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#include <linux/seq_file.h> |
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#include <linux/major.h> |
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#include <linux/root_dev.h> |
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#include <linux/delay.h> |
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#include <linux/nfs_fs.h> |
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#include <linux/slab.h> |
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#include <linux/export.h> |
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#include <net/net_namespace.h> |
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#include <net/arp.h> |
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#include <net/ip.h> |
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#include <net/ipconfig.h> |
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#include <net/route.h> |
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|
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#include <linux/uaccess.h> |
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#include <net/checksum.h> |
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#include <asm/processor.h> |
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|
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#if defined(CONFIG_IP_PNP_DHCP) |
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#define IPCONFIG_DHCP |
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#endif |
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#if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP) |
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#define IPCONFIG_BOOTP |
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#endif |
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#if defined(CONFIG_IP_PNP_RARP) |
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#define IPCONFIG_RARP |
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#endif |
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#if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP) |
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#define IPCONFIG_DYNAMIC |
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#endif |
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|
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/* Define the friendly delay before and after opening net devices */ |
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#define CONF_POST_OPEN 10 /* After opening: 10 msecs */ |
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|
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/* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */ |
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#define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */ |
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#define CONF_SEND_RETRIES 6 /* Send six requests per open */ |
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#define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */ |
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#define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */ |
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#define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */ |
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#define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */ |
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#define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers |
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- '3' from resolv.h */ |
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#define CONF_NTP_SERVERS_MAX 3 /* Maximum number of NTP servers */ |
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|
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#define NONE cpu_to_be32(INADDR_NONE) |
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#define ANY cpu_to_be32(INADDR_ANY) |
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|
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/* Wait for carrier timeout default in seconds */ |
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static unsigned int carrier_timeout = 120; |
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|
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/* |
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* Public IP configuration |
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*/ |
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|
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/* This is used by platforms which might be able to set the ipconfig |
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* variables using firmware environment vars. If this is set, it will |
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* ignore such firmware variables. |
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*/ |
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int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */ |
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|
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static int ic_enable __initdata; /* IP config enabled? */ |
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|
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/* Protocol choice */ |
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int ic_proto_enabled __initdata = 0 |
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#ifdef IPCONFIG_BOOTP |
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| IC_BOOTP |
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#endif |
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#ifdef CONFIG_IP_PNP_DHCP |
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| IC_USE_DHCP |
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#endif |
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#ifdef IPCONFIG_RARP |
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| IC_RARP |
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#endif |
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; |
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|
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static int ic_host_name_set __initdata; /* Host name set by us? */ |
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|
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__be32 ic_myaddr = NONE; /* My IP address */ |
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static __be32 ic_netmask = NONE; /* Netmask for local subnet */ |
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__be32 ic_gateway = NONE; /* Gateway IP address */ |
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|
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#ifdef IPCONFIG_DYNAMIC |
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static __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */ |
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#endif |
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|
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__be32 ic_servaddr = NONE; /* Boot server IP address */ |
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|
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__be32 root_server_addr = NONE; /* Address of NFS server */ |
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u8 root_server_path[256] = { 0, }; /* Path to mount as root */ |
|
|
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/* vendor class identifier */ |
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static char vendor_class_identifier[253] __initdata; |
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|
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#if defined(CONFIG_IP_PNP_DHCP) |
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static char dhcp_client_identifier[253] __initdata; |
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#endif |
|
|
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/* Persistent data: */ |
|
|
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#ifdef IPCONFIG_DYNAMIC |
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static int ic_proto_used; /* Protocol used, if any */ |
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#else |
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#define ic_proto_used 0 |
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#endif |
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static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */ |
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static __be32 ic_ntp_servers[CONF_NTP_SERVERS_MAX]; /* NTP server IP addresses */ |
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static u8 ic_domain[64]; /* DNS (not NIS) domain name */ |
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|
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/* |
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* Private state. |
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*/ |
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|
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/* Name of user-selected boot device */ |
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static char user_dev_name[IFNAMSIZ] __initdata = { 0, }; |
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|
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/* Protocols supported by available interfaces */ |
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static int ic_proto_have_if __initdata; |
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|
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/* MTU for boot device */ |
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static int ic_dev_mtu __initdata; |
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|
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#ifdef IPCONFIG_DYNAMIC |
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static DEFINE_SPINLOCK(ic_recv_lock); |
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static volatile int ic_got_reply __initdata; /* Proto(s) that replied */ |
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#endif |
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#ifdef IPCONFIG_DHCP |
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static int ic_dhcp_msgtype __initdata; /* DHCP msg type received */ |
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#endif |
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|
|
|
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/* |
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* Network devices |
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*/ |
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|
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struct ic_device { |
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struct ic_device *next; |
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struct net_device *dev; |
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unsigned short flags; |
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short able; |
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__be32 xid; |
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}; |
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|
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static struct ic_device *ic_first_dev __initdata; /* List of open device */ |
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static struct ic_device *ic_dev __initdata; /* Selected device */ |
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|
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static bool __init ic_is_init_dev(struct net_device *dev) |
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{ |
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if (dev->flags & IFF_LOOPBACK) |
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return false; |
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return user_dev_name[0] ? !strcmp(dev->name, user_dev_name) : |
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(!(dev->flags & IFF_LOOPBACK) && |
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(dev->flags & (IFF_POINTOPOINT|IFF_BROADCAST)) && |
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strncmp(dev->name, "dummy", 5)); |
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} |
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|
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static int __init ic_open_devs(void) |
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{ |
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struct ic_device *d, **last; |
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struct net_device *dev; |
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unsigned short oflags; |
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unsigned long start, next_msg; |
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|
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last = &ic_first_dev; |
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rtnl_lock(); |
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|
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/* bring loopback device up first */ |
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for_each_netdev(&init_net, dev) { |
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if (!(dev->flags & IFF_LOOPBACK)) |
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continue; |
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if (dev_change_flags(dev, dev->flags | IFF_UP, NULL) < 0) |
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pr_err("IP-Config: Failed to open %s\n", dev->name); |
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} |
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|
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for_each_netdev(&init_net, dev) { |
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if (ic_is_init_dev(dev)) { |
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int able = 0; |
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if (dev->mtu >= 364) |
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able |= IC_BOOTP; |
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else |
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pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n", |
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dev->name, dev->mtu); |
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if (!(dev->flags & IFF_NOARP)) |
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able |= IC_RARP; |
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able &= ic_proto_enabled; |
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if (ic_proto_enabled && !able) |
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continue; |
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oflags = dev->flags; |
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if (dev_change_flags(dev, oflags | IFF_UP, NULL) < 0) { |
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pr_err("IP-Config: Failed to open %s\n", |
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dev->name); |
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continue; |
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} |
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if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) { |
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rtnl_unlock(); |
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return -ENOMEM; |
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} |
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d->dev = dev; |
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*last = d; |
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last = &d->next; |
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d->flags = oflags; |
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d->able = able; |
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if (able & IC_BOOTP) |
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get_random_bytes(&d->xid, sizeof(__be32)); |
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else |
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d->xid = 0; |
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ic_proto_have_if |= able; |
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pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n", |
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dev->name, able, d->xid); |
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} |
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} |
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|
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/* no point in waiting if we could not bring up at least one device */ |
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if (!ic_first_dev) |
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goto have_carrier; |
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|
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/* wait for a carrier on at least one device */ |
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start = jiffies; |
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next_msg = start + msecs_to_jiffies(20000); |
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while (time_before(jiffies, start + |
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msecs_to_jiffies(carrier_timeout * 1000))) { |
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int wait, elapsed; |
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|
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for_each_netdev(&init_net, dev) |
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if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) |
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goto have_carrier; |
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|
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msleep(1); |
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|
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if (time_before(jiffies, next_msg)) |
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continue; |
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|
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elapsed = jiffies_to_msecs(jiffies - start); |
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wait = (carrier_timeout * 1000 - elapsed + 500) / 1000; |
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pr_info("Waiting up to %d more seconds for network.\n", wait); |
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next_msg = jiffies + msecs_to_jiffies(20000); |
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} |
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have_carrier: |
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rtnl_unlock(); |
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|
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*last = NULL; |
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|
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if (!ic_first_dev) { |
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if (user_dev_name[0]) |
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pr_err("IP-Config: Device `%s' not found\n", |
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user_dev_name); |
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else |
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pr_err("IP-Config: No network devices available\n"); |
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return -ENODEV; |
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} |
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return 0; |
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} |
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|
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/* Close all network interfaces except the one we've autoconfigured, and its |
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* lowers, in case it's a stacked virtual interface. |
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*/ |
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static void __init ic_close_devs(void) |
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{ |
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struct net_device *selected_dev = ic_dev ? ic_dev->dev : NULL; |
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struct ic_device *d, *next; |
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struct net_device *dev; |
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|
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rtnl_lock(); |
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next = ic_first_dev; |
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while ((d = next)) { |
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bool bring_down = (d != ic_dev); |
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struct net_device *lower; |
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struct list_head *iter; |
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|
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next = d->next; |
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dev = d->dev; |
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|
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if (selected_dev) { |
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netdev_for_each_lower_dev(selected_dev, lower, iter) { |
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if (dev == lower) { |
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bring_down = false; |
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break; |
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} |
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} |
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} |
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if (bring_down) { |
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pr_debug("IP-Config: Downing %s\n", dev->name); |
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dev_change_flags(dev, d->flags, NULL); |
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} |
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kfree(d); |
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} |
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rtnl_unlock(); |
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} |
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|
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/* |
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* Interface to various network functions. |
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*/ |
|
|
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static inline void |
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set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port) |
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{ |
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sin->sin_family = AF_INET; |
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sin->sin_addr.s_addr = addr; |
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sin->sin_port = port; |
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} |
|
|
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/* |
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* Set up interface addresses and routes. |
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*/ |
|
|
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static int __init ic_setup_if(void) |
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{ |
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struct ifreq ir; |
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struct sockaddr_in *sin = (void *) &ir.ifr_ifru.ifru_addr; |
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int err; |
|
|
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memset(&ir, 0, sizeof(ir)); |
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strcpy(ir.ifr_ifrn.ifrn_name, ic_dev->dev->name); |
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set_sockaddr(sin, ic_myaddr, 0); |
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if ((err = devinet_ioctl(&init_net, SIOCSIFADDR, &ir)) < 0) { |
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pr_err("IP-Config: Unable to set interface address (%d)\n", |
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err); |
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return -1; |
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} |
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set_sockaddr(sin, ic_netmask, 0); |
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if ((err = devinet_ioctl(&init_net, SIOCSIFNETMASK, &ir)) < 0) { |
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pr_err("IP-Config: Unable to set interface netmask (%d)\n", |
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err); |
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return -1; |
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} |
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set_sockaddr(sin, ic_myaddr | ~ic_netmask, 0); |
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if ((err = devinet_ioctl(&init_net, SIOCSIFBRDADDR, &ir)) < 0) { |
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pr_err("IP-Config: Unable to set interface broadcast address (%d)\n", |
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err); |
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return -1; |
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} |
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/* Handle the case where we need non-standard MTU on the boot link (a network |
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* using jumbo frames, for instance). If we can't set the mtu, don't error |
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* out, we'll try to muddle along. |
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*/ |
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if (ic_dev_mtu != 0) { |
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rtnl_lock(); |
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if ((err = dev_set_mtu(ic_dev->dev, ic_dev_mtu)) < 0) |
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pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", |
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ic_dev_mtu, err); |
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rtnl_unlock(); |
|
} |
|
return 0; |
|
} |
|
|
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static int __init ic_setup_routes(void) |
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{ |
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/* No need to setup device routes, only the default route... */ |
|
|
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if (ic_gateway != NONE) { |
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struct rtentry rm; |
|
int err; |
|
|
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memset(&rm, 0, sizeof(rm)); |
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if ((ic_gateway ^ ic_myaddr) & ic_netmask) { |
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pr_err("IP-Config: Gateway not on directly connected network\n"); |
|
return -1; |
|
} |
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set_sockaddr((struct sockaddr_in *) &rm.rt_dst, 0, 0); |
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set_sockaddr((struct sockaddr_in *) &rm.rt_genmask, 0, 0); |
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set_sockaddr((struct sockaddr_in *) &rm.rt_gateway, ic_gateway, 0); |
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rm.rt_flags = RTF_UP | RTF_GATEWAY; |
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if ((err = ip_rt_ioctl(&init_net, SIOCADDRT, &rm)) < 0) { |
|
pr_err("IP-Config: Cannot add default route (%d)\n", |
|
err); |
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return -1; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* 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) |
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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 if (IN_CLASSE(ntohl(ic_myaddr))) |
|
ic_netmask = htonl(IN_CLASSE_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; |
|
} |
|
|
|
/* |
|
* 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); |
|
} |
|
|
|
static inline void __init ic_rarp_cleanup(void) |
|
{ |
|
dev_remove_pack(&rarp_packet_type); |
|
} |
|
|
|
/* |
|
* 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; |
|
} |
|
|
|
|
|
/* |
|
* 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); |
|
} |
|
#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; |
|
} |
|
|
|
/* Predefine NTP servers */ |
|
static inline void __init ic_ntp_servers_predef(void) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) |
|
ic_ntp_servers[i] = NONE; |
|
} |
|
|
|
/* |
|
* 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 */ |
|
42, /* NTP servers */ |
|
}; |
|
|
|
*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 */ |
|
} |
|
|
|
#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; |
|
#if CONF_NAMESERVERS_MAX > 0 |
|
*e++ = 6; /* (DNS) name server request */ |
|
*e++ = 4 * CONF_NAMESERVERS_MAX; |
|
e += 4 * CONF_NAMESERVERS_MAX; |
|
#endif |
|
*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 */ |
|
} |
|
|
|
|
|
/* |
|
* Initialize the DHCP/BOOTP mechanism. |
|
*/ |
|
static inline void __init ic_bootp_init(void) |
|
{ |
|
/* Re-initialise all name servers and NTP servers to NONE, in case any |
|
* were set via the "ip=" or "nfsaddrs=" kernel command line parameters: |
|
* any IP addresses specified there will already have been decoded but |
|
* are no longer needed |
|
*/ |
|
ic_nameservers_predef(); |
|
ic_ntp_servers_predef(); |
|
|
|
dev_add_pack(&bootp_packet_type); |
|
} |
|
|
|
|
|
/* |
|
* DHCP/BOOTP cleanup. |
|
*/ |
|
static inline void __init ic_bootp_cleanup(void) |
|
{ |
|
dev_remove_pack(&bootp_packet_type); |
|
} |
|
|
|
|
|
/* |
|
* 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 = skb_put_zero(skb, 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"); |
|
} |
|
|
|
|
|
/* |
|
* Copy BOOTP-supplied string |
|
*/ |
|
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; |
|
} |
|
|
|
|
|
/* |
|
* 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 */ |
|
if (!ic_host_name_set) { |
|
ic_bootp_string(utsname()->nodename, ext+1, *ext, |
|
__NEW_UTS_LEN); |
|
ic_host_name_set = 1; |
|
} |
|
break; |
|
case 15: /* Domain name (DNS) */ |
|
if (!ic_domain[0]) |
|
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; |
|
case 42: /* NTP servers */ |
|
servers = *ext / 4; |
|
if (servers > CONF_NTP_SERVERS_MAX) |
|
servers = CONF_NTP_SERVERS_MAX; |
|
for (i = 0; i < servers; i++) { |
|
if (ic_ntp_servers[i] == NONE) |
|
memcpy(&ic_ntp_servers[i], ext+1+4*i, 4); |
|
} |
|
break; |
|
} |
|
} |
|
|
|
|
|
/* |
|
* 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; |
|
} |
|
|
|
|
|
#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; |
|
} |
|
|
|
#endif /* IPCONFIG_DYNAMIC */ |
|
|
|
#ifdef CONFIG_PROC_FS |
|
/* proc_dir_entry for /proc/net/ipconfig */ |
|
static struct proc_dir_entry *ipconfig_dir; |
|
|
|
/* Name servers: */ |
|
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; |
|
} |
|
|
|
/* Create the /proc/net/ipconfig directory */ |
|
static int __init ipconfig_proc_net_init(void) |
|
{ |
|
ipconfig_dir = proc_net_mkdir(&init_net, "ipconfig", init_net.proc_net); |
|
if (!ipconfig_dir) |
|
return -ENOMEM; |
|
|
|
return 0; |
|
} |
|
|
|
/* Create a new file under /proc/net/ipconfig */ |
|
static int ipconfig_proc_net_create(const char *name, |
|
const struct proc_ops *proc_ops) |
|
{ |
|
char *pname; |
|
struct proc_dir_entry *p; |
|
|
|
if (!ipconfig_dir) |
|
return -ENOMEM; |
|
|
|
pname = kasprintf(GFP_KERNEL, "%s%s", "ipconfig/", name); |
|
if (!pname) |
|
return -ENOMEM; |
|
|
|
p = proc_create(pname, 0444, init_net.proc_net, proc_ops); |
|
kfree(pname); |
|
if (!p) |
|
return -ENOMEM; |
|
|
|
return 0; |
|
} |
|
|
|
/* Write NTP server IP addresses to /proc/net/ipconfig/ntp_servers */ |
|
static int ntp_servers_show(struct seq_file *seq, void *v) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < CONF_NTP_SERVERS_MAX; i++) { |
|
if (ic_ntp_servers[i] != NONE) |
|
seq_printf(seq, "%pI4\n", &ic_ntp_servers[i]); |
|
} |
|
return 0; |
|
} |
|
DEFINE_PROC_SHOW_ATTRIBUTE(ntp_servers); |
|
#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; |
|
} |
|
|
|
#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; |
|
|
|
/* make sure deferred device probes are finished */ |
|
wait_for_device_probe(); |
|
|
|
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; |
|
} |
|
|
|
/* |
|
* 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, count; |
|
|
|
/* Initialise all name servers and NTP servers to NONE (but only if the |
|
* "ip=" or "nfsaddrs=" kernel command line parameters weren't decoded, |
|
* otherwise we'll overwrite the IP addresses specified there) |
|
*/ |
|
if (ic_set_manually == 0) { |
|
ic_nameservers_predef(); |
|
ic_ntp_servers_predef(); |
|
} |
|
|
|
#ifdef CONFIG_PROC_FS |
|
proc_create_single("pnp", 0444, init_net.proc_net, pnp_seq_show); |
|
|
|
if (ipconfig_proc_net_init() == 0) |
|
ipconfig_proc_net_create("ntp_servers", &ntp_servers_proc_ops); |
|
#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 || |
|
#if defined(CONFIG_ROOT_NFS) || defined(CONFIG_CIFS_ROOT) |
|
(root_server_addr == NONE && |
|
ic_servaddr == NONE && |
|
(ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) || |
|
#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 |
|
#ifdef CONFIG_CIFS_ROOT |
|
if (ROOT_DEV == Root_CIFS) { |
|
pr_err("IP-Config: Retrying forever (CIFS 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); |
|
/* Name servers (if any): */ |
|
for (i = 0, count = 0; i < CONF_NAMESERVERS_MAX; i++) { |
|
if (ic_nameservers[i] != NONE) { |
|
if (i == 0) |
|
pr_info(" nameserver%u=%pI4", |
|
i, &ic_nameservers[i]); |
|
else |
|
pr_cont(", nameserver%u=%pI4", |
|
i, &ic_nameservers[i]); |
|
|
|
count++; |
|
} |
|
if ((i + 1 == CONF_NAMESERVERS_MAX) && count > 0) |
|
pr_cont("\n"); |
|
} |
|
/* NTP servers (if any): */ |
|
for (i = 0, count = 0; i < CONF_NTP_SERVERS_MAX; i++) { |
|
if (ic_ntp_servers[i] != NONE) { |
|
if (i == 0) |
|
pr_info(" ntpserver%u=%pI4", |
|
i, &ic_ntp_servers[i]); |
|
else |
|
pr_cont(", ntpserver%u=%pI4", |
|
i, &ic_ntp_servers[i]); |
|
|
|
count++; |
|
} |
|
if ((i + 1 == CONF_NTP_SERVERS_MAX) && count > 0) |
|
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; |
|
} |
|
|
|
late_initcall(ip_auto_config); |
|
|
|
|
|
/* |
|
* Decode any IP configuration options in the "ip=" or "nfsaddrs=" kernel |
|
* command line parameter. See Documentation/admin-guide/nfs/nfsroot.rst. |
|
*/ |
|
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; |
|
} |
|
|
|
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; |
|
} |
|
|
|
/* Initialise all name servers and NTP servers to NONE */ |
|
ic_nameservers_predef(); |
|
ic_ntp_servers_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; |
|
case 9: |
|
if (CONF_NTP_SERVERS_MAX >= 1) { |
|
ic_ntp_servers[0] = in_aton(ip); |
|
if (ic_ntp_servers[0] == ANY) |
|
ic_ntp_servers[0] = NONE; |
|
} |
|
break; |
|
} |
|
} |
|
ip = cp; |
|
num++; |
|
} |
|
|
|
return 1; |
|
} |
|
__setup("ip=", ip_auto_config_setup); |
|
|
|
static int __init nfsaddrs_config_setup(char *addrs) |
|
{ |
|
return ip_auto_config_setup(addrs); |
|
} |
|
__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; |
|
} |
|
__setup("dhcpclass=", vendor_class_identifier_setup); |
|
|
|
static int __init set_carrier_timeout(char *str) |
|
{ |
|
ssize_t ret; |
|
|
|
if (!str) |
|
return 0; |
|
|
|
ret = kstrtouint(str, 0, &carrier_timeout); |
|
if (ret) |
|
return 0; |
|
|
|
return 1; |
|
} |
|
__setup("carrier_timeout=", set_carrier_timeout);
|
|
|