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-rw-r--r--net/ipv4/ipconfig.c1845
1 files changed, 1845 insertions, 0 deletions
diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
new file mode 100644
index 000000000..e90bc0aa8
--- /dev/null
+++ b/net/ipv4/ipconfig.c
@@ -0,0 +1,1845 @@
+// 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(sizeof(struct ic_device), GFP_KERNEL))) {
+ rtnl_unlock();
+ return -ENOMEM;
+ }
+ d->dev = dev;
+ *last = d;
+ last = &d->next;
+ d->flags = oflags;
+ d->able = able;
+ if (able & IC_BOOTP)
+ get_random_bytes(&d->xid, sizeof(__be32));
+ else
+ d->xid = 0;
+ ic_proto_have_if |= able;
+ pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n",
+ dev->name, able, d->xid);
+ }
+ }
+ /* 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 + msecs_to_jiffies(20000);
+ while (time_before(jiffies, start +
+ msecs_to_jiffies(carrier_timeout * 1000))) {
+ 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 + msecs_to_jiffies(20000);
+ }
+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)
+{
+ 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;
+ bool try_init_devs = true;
+
+ 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;
+ if (try_init_devs &&
+ (ROOT_DEV == Root_NFS || ROOT_DEV == Root_CIFS)) {
+ try_init_devs = false;
+ wait_for_init_devices_probe();
+ }
+ 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';
+ strscpy(utsname()->domainname, dp,
+ sizeof(utsname()->domainname));
+ }
+ strscpy(utsname()->nodename, ip,
+ sizeof(utsname()->nodename));
+ ic_host_name_set = 1;
+ break;
+ case 5:
+ strscpy(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 (strscpy(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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 01:32:37 +0000