// SPDX-License-Identifier: GPL-2.0/* * 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 * * NTP servers in /proc/net/ipconfig/ntp_servers * -- Chris Novakovic <chris@chrisn.me.uk>, April 2018 */ #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 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 CONF_NTP_SERVERS_MAX 3 /* Maximum number of NTP servers */ #define NONE cpu_to_be32(INADDR_NONE)#define ANY cpu_to_be32(INADDR_ANY) /* Wait for carrier timeout default in seconds */static unsigned int carrier_timeout = 120; /* * 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_DYNAMICstatic __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_DYNAMICstatic int ic_proto_used; /* Protocol used, if any */#else#define ic_proto_used 0#endifstatic __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */static __be32 ic_ntp_servers[CONF_NTP_SERVERS_MAX]; /* NTP 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_DYNAMICstatic DEFINE_SPINLOCK(ic_recv_lock);static volatile int ic_got_reply __initdata; /* Proto(s) that replied */#endif#ifdef IPCONFIG_DHCPstatic 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));} 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 device up first */ for_each_netdev(&init_net, dev) { if (!(dev->flags & IFF_LOOPBACK)) continue; if (dev_change_flags(dev, dev->flags | IFF_UP, NULL) < 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, NULL) < 0) { pr_err("IP-Config: Failed to open %s\n", dev->name); continue; } if (!(d = kmalloc_obj(struct ic_device))) { 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); } } /* Devices with a complex topology like SFP ethernet interfaces needs * the rtnl_lock at init. The carrier wait-loop must therefore run * without holding it. */ rtnl_unlock(); /* 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 + secs_to_jiffies(20); while (time_before(jiffies, start + secs_to_jiffies(carrier_timeout))) { int wait, elapsed; rtnl_lock(); for_each_netdev(&init_net, dev) if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) { rtnl_unlock(); goto have_carrier; } rtnl_unlock(); msleep(1); if (time_before(jiffies, next_msg)) continue; elapsed = jiffies_to_msecs(jiffies - start); wait = (carrier_timeout * 1000 - elapsed + 500) / 1000; pr_info("Waiting up to %d more seconds for network.\n", wait); next_msg = jiffies + secs_to_jiffies(20); }have_carrier: *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;} /* Close all network interfaces except the one we've autoconfigured, and its * lowers, in case it's a stacked virtual interface. */static void __init ic_close_devs(void){ struct net_device *selected_dev = ic_dev ? ic_dev->dev : NULL; struct ic_device *d, *next; struct net_device *dev; rtnl_lock(); next = ic_first_dev; while ((d = next)) { bool bring_down = (d != ic_dev); struct net_device *lower; struct list_head *iter; next = d->next; dev = d->dev; if (selected_dev) { netdev_for_each_lower_dev(selected_dev, lower, iter) { if (dev == lower) { bring_down = false; break; } } } if (bring_down) { pr_debug("IP-Config: Downing %s\n", dev->name); dev_change_flags(dev, d->flags, NULL); } kfree(d); } rtnl_unlock();} /* * Interface to various network functions. */ static inline voidset_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port){ sin->sin_family = AF_INET; sin->sin_addr.s_addr = addr; sin->sin_port = port;} /* * 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 = devinet_ioctl(&init_net, 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 = devinet_ioctl(&init_net, 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 = devinet_ioctl(&init_net, 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) { rtnl_lock(); if ((err = dev_set_mtu(ic_dev->dev, ic_dev_mtu)) < 0) pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", ic_dev_mtu, err); rtnl_unlock(); } return 0;} 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 = ip_rt_ioctl(&init_net, SIOCADDRT, &rm)) < 0) { pr_err("IP-Config: Cannot add default route (%d)\n", err); 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) 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 __initic_rarp_recv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev){Lines 1–500 of 1847. 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// SPDX-License-Identifier: GPL-2.0 /* * 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 * * NTP servers in /proc/net/ipconfig/ntp_servers * -- Chris Novakovic <chris@chrisn.me.uk>, April 2018 */ #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 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 CONF_NTP_SERVERS_MAX 3 /* Maximum number of NTP servers */ #define NONE cpu_to_be32(INADDR_NONE) #define ANY cpu_to_be32(INADDR_ANY) /* Wait for carrier timeout default in seconds */ static unsigned int carrier_timeout = 120; /* * 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 __be32 ic_ntp_servers[CONF_NTP_SERVERS_MAX]; /* NTP 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)); } 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 device up first */ for_each_netdev(&init_net, dev) { if (!(dev->flags & IFF_LOOPBACK)) continue; if (dev_change_flags(dev, dev->flags | IFF_UP, NULL) < 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, NULL) < 0) { pr_err("IP-Config: Failed to open %s\n", dev->name); continue; } if (!(d = kmalloc_obj(struct ic_device))) { 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); } } /* Devices with a complex topology like SFP ethernet interfaces needs * the rtnl_lock at init. The carrier wait-loop must therefore run * without holding it. */ rtnl_unlock(); /* 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 + secs_to_jiffies(20); while (time_before(jiffies, start + secs_to_jiffies(carrier_timeout))) { int wait, elapsed; rtnl_lock(); for_each_netdev(&init_net, dev) if (ic_is_init_dev(dev) && netif_carrier_ok(dev)) { rtnl_unlock(); goto have_carrier; } rtnl_unlock(); msleep(1); if (time_before(jiffies, next_msg)) continue; elapsed = jiffies_to_msecs(jiffies - start); wait = (carrier_timeout * 1000 - elapsed + 500) / 1000; pr_info("Waiting up to %d more seconds for network.\n", wait); next_msg = jiffies + secs_to_jiffies(20); } have_carrier: *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; } /* Close all network interfaces except the one we've autoconfigured, and its * lowers, in case it's a stacked virtual interface. */ static void __init ic_close_devs(void) { struct net_device *selected_dev = ic_dev ? ic_dev->dev : NULL; struct ic_device *d, *next; struct net_device *dev; rtnl_lock(); next = ic_first_dev; while ((d = next)) { bool bring_down = (d != ic_dev); struct net_device *lower; struct list_head *iter; next = d->next; dev = d->dev; if (selected_dev) { netdev_for_each_lower_dev(selected_dev, lower, iter) { if (dev == lower) { bring_down = false; break; } } } if (bring_down) { pr_debug("IP-Config: Downing %s\n", dev->name); dev_change_flags(dev, d->flags, NULL); } kfree(d); } rtnl_unlock(); } /* * 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; } /* * 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 = devinet_ioctl(&init_net, 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 = devinet_ioctl(&init_net, 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 = devinet_ioctl(&init_net, 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) { rtnl_lock(); if ((err = dev_set_mtu(ic_dev->dev, ic_dev_mtu)) < 0) pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n", ic_dev_mtu, err); rtnl_unlock(); } return 0; } 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 = ip_rt_ioctl(&init_net, SIOCADDRT, &rm)) < 0) { pr_err("IP-Config: Cannot add default route (%d)\n", err); 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) 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) {