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linux/net/ipv4/ipconfig.c
Linus Torvalds 1c8c5a9d38 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 
Pull networking updates from David Miller:

 1) Add Maglev hashing scheduler to IPVS, from Inju Song.

 2) Lots of new TC subsystem tests from Roman Mashak.

 3) Add TCP zero copy receive and fix delayed acks and autotuning with
    SO_RCVLOWAT, from Eric Dumazet.

 4) Add XDP_REDIRECT support to mlx5 driver, from Jesper Dangaard
    Brouer.

 5) Add ttl inherit support to vxlan, from Hangbin Liu.

 6) Properly separate ipv6 routes into their logically independant
    components. fib6_info for the routing table, and fib6_nh for sets of
    nexthops, which thus can be shared. From David Ahern.

 7) Add bpf_xdp_adjust_tail helper, which can be used to generate ICMP
    messages from XDP programs. From Nikita V. Shirokov.

 8) Lots of long overdue cleanups to the r8169 driver, from Heiner
    Kallweit.

 9) Add BTF ("BPF Type Format"), from Martin KaFai Lau.

10) Add traffic condition monitoring to iwlwifi, from Luca Coelho.

11) Plumb extack down into fib_rules, from Roopa Prabhu.

12) Add Flower classifier offload support to igb, from Vinicius Costa
    Gomes.

13) Add UDP GSO support, from Willem de Bruijn.

14) Add documentation for eBPF helpers, from Quentin Monnet.

15) Add TLS tx offload to mlx5, from Ilya Lesokhin.

16) Allow applications to be given the number of bytes available to read
    on a socket via a control message returned from recvmsg(), from
    Soheil Hassas Yeganeh.

17) Add x86_32 eBPF JIT compiler, from Wang YanQing.

18) Add AF_XDP sockets, with zerocopy support infrastructure as well.
    From Björn Töpel.

19) Remove indirect load support from all of the BPF JITs and handle
    these operations in the verifier by translating them into native BPF
    instead. From Daniel Borkmann.

20) Add GRO support to ipv6 gre tunnels, from Eran Ben Elisha.

21) Allow XDP programs to do lookups in the main kernel routing tables
    for forwarding. From David Ahern.

22) Allow drivers to store hardware state into an ELF section of kernel
    dump vmcore files, and use it in cxgb4. From Rahul Lakkireddy.

23) Various RACK and loss detection improvements in TCP, from Yuchung
    Cheng.

24) Add TCP SACK compression, from Eric Dumazet.

25) Add User Mode Helper support and basic bpfilter infrastructure, from
    Alexei Starovoitov.

26) Support ports and protocol values in RTM_GETROUTE, from Roopa
    Prabhu.

27) Support bulking in ->ndo_xdp_xmit() API, from Jesper Dangaard
    Brouer.

28) Add lots of forwarding selftests, from Petr Machata.

29) Add generic network device failover driver, from Sridhar Samudrala.

* ra.kernel.org:/pub/scm/linux/kernel/git/davem/net-next: (1959 commits)
  strparser: Add __strp_unpause and use it in ktls.
  rxrpc: Fix terminal retransmission connection ID to include the channel
  net: hns3: Optimize PF CMDQ interrupt switching process
  net: hns3: Fix for VF mailbox receiving unknown message
  net: hns3: Fix for VF mailbox cannot receiving PF response
  bnx2x: use the right constant
  Revert "net: sched: cls: Fix offloading when ingress dev is vxlan"
  net: dsa: b53: Fix for brcm tag issue in Cygnus SoC
  enic: fix UDP rss bits
  netdev-FAQ: clarify DaveM's position for stable backports
  rtnetlink: validate attributes in do_setlink()
  mlxsw: Add extack messages for port_{un, }split failures
  netdevsim: Add extack error message for devlink reload
  devlink: Add extack to reload and port_{un, }split operations
  net: metrics: add proper netlink validation
  ipmr: fix error path when ipmr_new_table fails
  ip6mr: only set ip6mr_table from setsockopt when ip6mr_new_table succeeds
  net: hns3: remove unused hclgevf_cfg_func_mta_filter
  netfilter: provide udp*_lib_lookup for nf_tproxy
  qed*: Utilize FW 8.37.2.0
  ...
2018-06-06 18:39:49 -07:00

1792 lines
42 KiB
C
Raw Blame History

// 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/dsa.h>
#include <net/ip.h>
#include <net/ipconfig.h>
#include <net/route.h>
#include <linux/uaccess.h>
#include <net/checksum.h>
#include <asm/processor.h>
#if defined(CONFIG_IP_PNP_DHCP)
#define IPCONFIG_DHCP
#endif
#if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_DHCP)
#define IPCONFIG_BOOTP
#endif
#if defined(CONFIG_IP_PNP_RARP)
#define IPCONFIG_RARP
#endif
#if defined(IPCONFIG_BOOTP) || defined(IPCONFIG_RARP)
#define IPCONFIG_DYNAMIC
#endif
/* Define the friendly delay before and after opening net devices */
#define CONF_POST_OPEN 10 /* After opening: 10 msecs */
#define CONF_CARRIER_TIMEOUT 120000 /* Wait for carrier timeout */
/* Define the timeout for waiting for a DHCP/BOOTP/RARP reply */
#define CONF_OPEN_RETRIES 2 /* (Re)open devices twice */
#define CONF_SEND_RETRIES 6 /* Send six requests per open */
#define CONF_BASE_TIMEOUT (HZ*2) /* Initial timeout: 2 seconds */
#define CONF_TIMEOUT_RANDOM (HZ) /* Maximum amount of randomization */
#define CONF_TIMEOUT_MULT *7/4 /* Rate of timeout growth */
#define CONF_TIMEOUT_MAX (HZ*30) /* Maximum allowed timeout */
#define CONF_NAMESERVERS_MAX 3 /* Maximum number of nameservers
- '3' from resolv.h */
#define CONF_NTP_SERVERS_MAX 3 /* Maximum number of NTP servers */
#define NONE cpu_to_be32(INADDR_NONE)
#define ANY cpu_to_be32(INADDR_ANY)
/*
* Public IP configuration
*/
/* This is used by platforms which might be able to set the ipconfig
* variables using firmware environment vars. If this is set, it will
* ignore such firmware variables.
*/
int ic_set_manually __initdata = 0; /* IPconfig parameters set manually */
static int ic_enable __initdata; /* IP config enabled? */
/* Protocol choice */
int ic_proto_enabled __initdata = 0
#ifdef IPCONFIG_BOOTP
| IC_BOOTP
#endif
#ifdef CONFIG_IP_PNP_DHCP
| IC_USE_DHCP
#endif
#ifdef IPCONFIG_RARP
| IC_RARP
#endif
;
static int ic_host_name_set __initdata; /* Host name set by us? */
__be32 ic_myaddr = NONE; /* My IP address */
static __be32 ic_netmask = NONE; /* Netmask for local subnet */
__be32 ic_gateway = NONE; /* Gateway IP address */
#ifdef IPCONFIG_DYNAMIC
static __be32 ic_addrservaddr = NONE; /* IP Address of the IP addresses'server */
#endif
__be32 ic_servaddr = NONE; /* Boot server IP address */
__be32 root_server_addr = NONE; /* Address of NFS server */
u8 root_server_path[256] = { 0, }; /* Path to mount as root */
/* vendor class identifier */
static char vendor_class_identifier[253] __initdata;
#if defined(CONFIG_IP_PNP_DHCP)
static char dhcp_client_identifier[253] __initdata;
#endif
/* Persistent data: */
#ifdef IPCONFIG_DYNAMIC
static int ic_proto_used; /* Protocol used, if any */
#else
#define ic_proto_used 0
#endif
static __be32 ic_nameservers[CONF_NAMESERVERS_MAX]; /* DNS Server IP addresses */
static __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 and DSA master network devices up first */
for_each_netdev(&init_net, dev) {
if (!(dev->flags & IFF_LOOPBACK) && !netdev_uses_dsa(dev))
continue;
if (dev_change_flags(dev, dev->flags | IFF_UP) < 0)
pr_err("IP-Config: Failed to open %s\n", dev->name);
}
for_each_netdev(&init_net, dev) {
if (ic_is_init_dev(dev)) {
int able = 0;
if (dev->mtu >= 364)
able |= IC_BOOTP;
else
pr_warn("DHCP/BOOTP: Ignoring device %s, MTU %d too small\n",
dev->name, dev->mtu);
if (!(dev->flags & IFF_NOARP))
able |= IC_RARP;
able &= ic_proto_enabled;
if (ic_proto_enabled && !able)
continue;
oflags = dev->flags;
if (dev_change_flags(dev, oflags | IFF_UP) < 0) {
pr_err("IP-Config: Failed to open %s\n",
dev->name);
continue;
}
if (!(d = kmalloc(sizeof(struct ic_device), GFP_KERNEL))) {
rtnl_unlock();
return -ENOMEM;
}
d->dev = dev;
*last = d;
last = &d->next;
d->flags = oflags;
d->able = able;
if (able & IC_BOOTP)
get_random_bytes(&d->xid, sizeof(__be32));
else
d->xid = 0;
ic_proto_have_if |= able;
pr_debug("IP-Config: %s UP (able=%d, xid=%08x)\n",
dev->name, able, d->xid);
}
}
/* no point in waiting if we could not bring up at least one device */
if (!ic_first_dev)
goto have_carrier;
/* wait for a carrier on at least one device */
start = jiffies;
next_msg = start + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
while (time_before(jiffies, start +
msecs_to_jiffies(CONF_CARRIER_TIMEOUT))) {
int wait, elapsed;
for_each_netdev(&init_net, dev)
if (ic_is_init_dev(dev) && netif_carrier_ok(dev))
goto have_carrier;
msleep(1);
if (time_before(jiffies, next_msg))
continue;
elapsed = jiffies_to_msecs(jiffies - start);
wait = (CONF_CARRIER_TIMEOUT - elapsed + 500)/1000;
pr_info("Waiting up to %d more seconds for network.\n", wait);
next_msg = jiffies + msecs_to_jiffies(CONF_CARRIER_TIMEOUT/12);
}
have_carrier:
rtnl_unlock();
*last = NULL;
if (!ic_first_dev) {
if (user_dev_name[0])
pr_err("IP-Config: Device `%s' not found\n",
user_dev_name);
else
pr_err("IP-Config: No network devices available\n");
return -ENODEV;
}
return 0;
}
static void __init ic_close_devs(void)
{
struct ic_device *d, *next;
struct net_device *dev;
rtnl_lock();
next = ic_first_dev;
while ((d = next)) {
next = d->next;
dev = d->dev;
if (d != ic_dev && !netdev_uses_dsa(dev)) {
pr_debug("IP-Config: Downing %s\n", dev->name);
dev_change_flags(dev, d->flags);
}
kfree(d);
}
rtnl_unlock();
}
/*
* 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 {
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 if not already set.
*/
static int __init ic_bootp_string(char *dest, char *src, int len, int max)
{
if (!len)
return 0;
if (len > max-1)
len = max-1;
memcpy(dest, src, len);
dest[len] = '\0';
return 1;
}
/*
* Process BOOTP extensions.
*/
static void __init ic_do_bootp_ext(u8 *ext)
{
u8 servers;
int i;
__be16 mtu;
u8 *c;
pr_debug("DHCP/BOOTP: Got extension %d:", *ext);
for (c=ext+2; c<ext+2+ext[1]; c++)
pr_debug(" %02x", *c);
pr_debug("\n");
switch (*ext++) {
case 1: /* Subnet mask */
if (ic_netmask == NONE)
memcpy(&ic_netmask, ext+1, 4);
break;
case 3: /* Default gateway */
if (ic_gateway == NONE)
memcpy(&ic_gateway, ext+1, 4);
break;
case 6: /* DNS server */
servers= *ext/4;
if (servers > CONF_NAMESERVERS_MAX)
servers = CONF_NAMESERVERS_MAX;
for (i = 0; i < servers; i++) {
if (ic_nameservers[i] == NONE)
memcpy(&ic_nameservers[i], ext+1+4*i, 4);
}
break;
case 12: /* Host name */
ic_bootp_string(utsname()->nodename, ext+1, *ext,
__NEW_UTS_LEN);
ic_host_name_set = 1;
break;
case 15: /* Domain name (DNS) */
ic_bootp_string(ic_domain, ext+1, *ext, sizeof(ic_domain));
break;
case 17: /* Root path */
if (!root_server_path[0])
ic_bootp_string(root_server_path, ext+1, *ext,
sizeof(root_server_path));
break;
case 26: /* Interface MTU */
memcpy(&mtu, ext+1, sizeof(mtu));
ic_dev_mtu = ntohs(mtu);
break;
case 40: /* NIS Domain name (_not_ DNS) */
ic_bootp_string(utsname()->domainname, ext+1, *ext,
__NEW_UTS_LEN);
break;
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 file_operations *fops)
{
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, fops);
kfree(pname);
if (!p)
return -ENOMEM;
return 0;
}
/* Write NTP server IP addresses to /proc/net/ipconfig/ntp_servers */
static int ntp_servers_seq_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;
}
static int ntp_servers_seq_open(struct inode *inode, struct file *file)
{
return single_open(file, ntp_servers_seq_show, NULL);
}
static const struct file_operations ntp_servers_seq_fops = {
.open = ntp_servers_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
#endif /* CONFIG_PROC_FS */
/*
* Extract IP address from the parameter string if needed. Note that we
* need to have root_server_addr set _before_ IPConfig gets called as it
* can override it.
*/
__be32 __init root_nfs_parse_addr(char *name)
{
__be32 addr;
int octets = 0;
char *cp, *cq;
cp = cq = name;
while (octets < 4) {
while (*cp >= '0' && *cp <= '9')
cp++;
if (cp == cq || cp - cq > 3)
break;
if (*cp == '.' || octets == 3)
octets++;
if (octets < 4)
cp++;
cq = cp;
}
if (octets == 4 && (*cp == ':' || *cp == '\0')) {
if (*cp == ':')
*cp++ = '\0';
addr = in_aton(name);
memmove(name, cp, strlen(cp) + 1);
} else
addr = NONE;
return addr;
}
#define DEVICE_WAIT_MAX 12 /* 12 seconds */
static int __init wait_for_devices(void)
{
int i;
for (i = 0; i < DEVICE_WAIT_MAX; i++) {
struct net_device *dev;
int found = 0;
rtnl_lock();
for_each_netdev(&init_net, dev) {
if (ic_is_init_dev(dev)) {
found = 1;
break;
}
}
rtnl_unlock();
if (found)
return 0;
ssleep(1);
}
return -ENODEV;
}
/*
* 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;
/* 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_seq_fops);
#endif /* CONFIG_PROC_FS */
if (!ic_enable)
return 0;
pr_debug("IP-Config: Entered.\n");
#ifdef IPCONFIG_DYNAMIC
try_try_again:
#endif
/* Wait for devices to appear */
err = wait_for_devices();
if (err)
return err;
/* Setup all network devices */
err = ic_open_devs();
if (err)
return err;
/* Give drivers a chance to settle */
msleep(CONF_POST_OPEN);
/*
* If the config information is insufficient (e.g., our IP address or
* IP address of the boot server is missing or we have multiple network
* interfaces and no default was set), use BOOTP or RARP to get the
* missing values.
*/
if (ic_myaddr == NONE ||
#ifdef CONFIG_ROOT_NFS
(root_server_addr == NONE &&
ic_servaddr == NONE &&
ROOT_DEV == Root_NFS) ||
#endif
ic_first_dev->next) {
#ifdef IPCONFIG_DYNAMIC
if (ic_dynamic() < 0) {
ic_close_devs();
/*
* I don't know why, but sometimes the
* eepro100 driver (at least) gets upset and
* doesn't work the first time it's opened.
* But then if you close it and reopen it, it
* works just fine. So we need to try that at
* least once before giving up.
*
* Also, if the root will be NFS-mounted, we
* have nowhere to go if DHCP fails. So we
* just have to keep trying forever.
*
* -- Chip
*/
#ifdef CONFIG_ROOT_NFS
if (ROOT_DEV == Root_NFS) {
pr_err("IP-Config: Retrying forever (NFS root)...\n");
goto try_try_again;
}
#endif
if (--retries) {
pr_err("IP-Config: Reopening network devices...\n");
goto try_try_again;
}
/* Oh, well. At least we tried. */
pr_err("IP-Config: Auto-configuration of network failed\n");
return -1;
}
#else /* !DYNAMIC */
pr_err("IP-Config: Incomplete network configuration information\n");
ic_close_devs();
return -1;
#endif /* IPCONFIG_DYNAMIC */
} else {
/* Device selected manually or only one device -> use it */
ic_dev = ic_first_dev;
}
addr = root_nfs_parse_addr(root_server_path);
if (root_server_addr == NONE)
root_server_addr = addr;
/*
* Use defaults wherever applicable.
*/
if (ic_defaults() < 0)
return -1;
/*
* Record which protocol was actually used.
*/
#ifdef IPCONFIG_DYNAMIC
ic_proto_used = ic_got_reply | (ic_proto_enabled & IC_USE_DHCP);
#endif
#ifndef IPCONFIG_SILENT
/*
* Clue in the operator.
*/
pr_info("IP-Config: Complete:\n");
pr_info(" device=%s, hwaddr=%*phC, ipaddr=%pI4, mask=%pI4, gw=%pI4\n",
ic_dev->dev->name, ic_dev->dev->addr_len, ic_dev->dev->dev_addr,
&ic_myaddr, &ic_netmask, &ic_gateway);
pr_info(" host=%s, domain=%s, nis-domain=%s\n",
utsname()->nodename, ic_domain, utsname()->domainname);
pr_info(" bootserver=%pI4, rootserver=%pI4, rootpath=%s",
&ic_servaddr, &root_server_addr, root_server_path);
if (ic_dev_mtu)
pr_cont(", mtu=%d", ic_dev_mtu);
/* Name servers (if any): */
for (i = 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]);
}
if (i + 1 == CONF_NAMESERVERS_MAX)
pr_cont("\n");
}
/* NTP servers (if any): */
for (i = 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]);
}
if (i + 1 == CONF_NTP_SERVERS_MAX)
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/filesystems/nfs/nfsroot.txt.
*/
static int __init ic_proto_name(char *name)
{
if (!strcmp(name, "on") || !strcmp(name, "any")) {
return 1;
}
if (!strcmp(name, "off") || !strcmp(name, "none")) {
return 0;
}
#ifdef CONFIG_IP_PNP_DHCP
else if (!strncmp(name, "dhcp", 4)) {
char *client_id;
ic_proto_enabled &= ~IC_RARP;
client_id = strstr(name, "dhcp,");
if (client_id) {
char *v;
client_id = client_id + 5;
v = strchr(client_id, ',');
if (!v)
return 1;
*v = 0;
if (kstrtou8(client_id, 0, dhcp_client_identifier))
pr_debug("DHCP: Invalid client identifier type\n");
strncpy(dhcp_client_identifier + 1, v + 1, 251);
*v = ',';
}
return 1;
}
#endif
#ifdef CONFIG_IP_PNP_BOOTP
else if (!strcmp(name, "bootp")) {
ic_proto_enabled &= ~(IC_RARP | IC_USE_DHCP);
return 1;
}
#endif
#ifdef CONFIG_IP_PNP_RARP
else if (!strcmp(name, "rarp")) {
ic_proto_enabled &= ~(IC_BOOTP | IC_USE_DHCP);
return 1;
}
#endif
#ifdef IPCONFIG_DYNAMIC
else if (!strcmp(name, "both")) {
ic_proto_enabled &= ~IC_USE_DHCP; /* backward compat :-( */
return 1;
}
#endif
return 0;
}
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);
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