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/*
* INET An implementation of the TCP/IP protocol suite for the LINUX
* operating system. INET is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* PF_INET protocol family socket handler.
*
* Version: $Id: af_inet.c,v 1.136 2001/11/06 22:21:08 davem Exp $
*
* Authors: Ross Biro, <bir7@leland.Stanford.Edu>
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
* Florian La Roche, <flla@stud.uni-sb.de>
* Alan Cox, <A.Cox@swansea.ac.uk>
*
* Changes (see also sock.c)
*
* piggy,
* Karl Knutson : Socket protocol table
* A.N.Kuznetsov : Socket death error in accept().
* John Richardson : Fix non blocking error in connect()
* so sockets that fail to connect
* don't return -EINPROGRESS.
* Alan Cox : Asynchronous I/O support
* Alan Cox : Keep correct socket pointer on sock structures
* when accept() ed
* Alan Cox : Semantics of SO_LINGER aren't state moved
* to close when you look carefully. With
* this fixed and the accept bug fixed
* some RPC stuff seems happier.
* Niibe Yutaka : 4.4BSD style write async I/O
* Alan Cox,
* Tony Gale : Fixed reuse semantics.
* Alan Cox : bind() shouldn't abort existing but dead
* sockets. Stops FTP netin:.. I hope.
* Alan Cox : bind() works correctly for RAW sockets. Note
* that FreeBSD at least was broken in this respect
* so be careful with compatibility tests...
* Alan Cox : routing cache support
* Alan Cox : memzero the socket structure for compactness.
* Matt Day : nonblock connect error handler
* Alan Cox : Allow large numbers of pending sockets
* (eg for big web sites), but only if
* specifically application requested.
* Alan Cox : New buffering throughout IP. Used dumbly.
* Alan Cox : New buffering now used smartly.
* Alan Cox : BSD rather than common sense interpretation of
* listen.
* Germano Caronni : Assorted small races.
* Alan Cox : sendmsg/recvmsg basic support.
* Alan Cox : Only sendmsg/recvmsg now supported.
* Alan Cox : Locked down bind (see security list).
* Alan Cox : Loosened bind a little.
* Mike McLagan : ADD/DEL DLCI Ioctls
* Willy Konynenberg : Transparent proxying support.
* David S. Miller : New socket lookup architecture.
* Some other random speedups.
* Cyrus Durgin : Cleaned up file for kmod hacks.
* Andi Kleen : Fix inet_stream_connect TCP race.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/netfilter_ipv4.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/smp_lock.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/brlock.h>
#include <net/ip.h>
#include <net/protocol.h>
#include <net/arp.h>
#include <net/route.h>
#include <net/tcp.h>
#include <net/udp.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/raw.h>
#include <net/icmp.h>
#include <net/ipip.h>
#include <net/inet_common.h>
#ifdef CONFIG_IP_MROUTE
#include <linux/mroute.h>
#endif
#include <linux/if_bridge.h>
#ifdef CONFIG_KMOD
#include <linux/kmod.h>
#endif
#ifdef CONFIG_NET_DIVERT
#include <linux/divert.h>
#endif /* CONFIG_NET_DIVERT */
#if defined(CONFIG_NET_RADIO) || defined(CONFIG_NET_PCMCIA_RADIO)
#include <linux/wireless.h> /* Note : will define WIRELESS_EXT */
#endif /* CONFIG_NET_RADIO || CONFIG_NET_PCMCIA_RADIO */
struct linux_mib net_statistics[NR_CPUS*2];
#ifdef INET_REFCNT_DEBUG
atomic_t inet_sock_nr;
#endif
extern int raw_get_info(char *, char **, off_t, int);
extern int snmp_get_info(char *, char **, off_t, int);
extern int netstat_get_info(char *, char **, off_t, int);
extern int afinet_get_info(char *, char **, off_t, int);
extern int tcp_get_info(char *, char **, off_t, int);
extern int udp_get_info(char *, char **, off_t, int);
extern void ip_mc_drop_socket(struct sock *sk);
#ifdef CONFIG_DLCI
extern int dlci_ioctl(unsigned int, void*);
#endif
#ifdef CONFIG_DLCI_MODULE
int (*dlci_ioctl_hook)(unsigned int, void *);
#endif
#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
int (*br_ioctl_hook)(unsigned long);
#endif
#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
int (*vlan_ioctl_hook)(unsigned long arg);
#endif
/* The inetsw table contains everything that inet_create needs to
* build a new socket.
*/
struct list_head inetsw[SOCK_MAX];
/* New destruction routine */
void inet_sock_destruct(struct sock *sk)
{
__skb_queue_purge(&sk->receive_queue);
__skb_queue_purge(&sk->error_queue);
if (sk->type == SOCK_STREAM && sk->state != TCP_CLOSE) {
printk("Attempt to release TCP socket in state %d %p\n",
sk->state,
sk);
return;
}
if (!sk->dead) {
printk("Attempt to release alive inet socket %p\n", sk);
return;
}
BUG_TRAP(atomic_read(&sk->rmem_alloc) == 0);
BUG_TRAP(atomic_read(&sk->wmem_alloc) == 0);
BUG_TRAP(sk->wmem_queued == 0);
BUG_TRAP(sk->forward_alloc == 0);
if (sk->protinfo.af_inet.opt)
kfree(sk->protinfo.af_inet.opt);
dst_release(sk->dst_cache);
#ifdef INET_REFCNT_DEBUG
atomic_dec(&inet_sock_nr);
printk(KERN_DEBUG "INET socket %p released, %d are still alive\n", sk, atomic_read(&inet_sock_nr));
#endif
}
void inet_sock_release(struct sock *sk)
{
if (sk->prot->destroy)
sk->prot->destroy(sk);
/* Observation: when inet_sock_release is called, processes have
* no access to socket. But net still has.
* Step one, detach it from networking:
*
* A. Remove from hash tables.
*/
sk->prot->unhash(sk);
/* In this point socket cannot receive new packets,
* but it is possible that some packets are in flight
* because some CPU runs receiver and did hash table lookup
* before we unhashed socket. They will achieve receive queue
* and will be purged by socket destructor.
*
* Also we still have packets pending on receive
* queue and probably, our own packets waiting in device queues.
* sock_destroy will drain receive queue, but transmitted
* packets will delay socket destruction until the last reference
* will be released.
*/
sock_orphan(sk);
#ifdef INET_REFCNT_DEBUG
if (atomic_read(&sk->refcnt) != 1) {
printk(KERN_DEBUG "Destruction inet %p delayed, c=%d\n", sk, atomic_read(&sk->refcnt));
}
#endif
sock_put(sk);
}
/*
* The routines beyond this point handle the behaviour of an AF_INET
* socket object. Mostly it punts to the subprotocols of IP to do
* the work.
*/
/*
* Set socket options on an inet socket.
*/
int inet_setsockopt(struct socket *sock, int level, int optname,
char *optval, int optlen)
{
struct sock *sk=sock->sk;
return sk->prot->setsockopt(sk,level,optname,optval,optlen);
}
/*
* Get a socket option on an AF_INET socket.
*
* FIX: POSIX 1003.1g is very ambiguous here. It states that
* asynchronous errors should be reported by getsockopt. We assume
* this means if you specify SO_ERROR (otherwise whats the point of it).
*/
int inet_getsockopt(struct socket *sock, int level, int optname,
char *optval, int *optlen)
{
struct sock *sk=sock->sk;
return sk->prot->getsockopt(sk,level,optname,optval,optlen);
}
/*
* Automatically bind an unbound socket.
*/
static int inet_autobind(struct sock *sk)
{
/* We may need to bind the socket. */
lock_sock(sk);
if (sk->num == 0) {
if (sk->prot->get_port(sk, 0) != 0) {
release_sock(sk);
return -EAGAIN;
}
sk->sport = htons(sk->num);
}
release_sock(sk);
return 0;
}
/*
* Move a socket into listening state.
*/
int inet_listen(struct socket *sock, int backlog)
{
struct sock *sk = sock->sk;
unsigned char old_state;
int err;
lock_sock(sk);
err = -EINVAL;
if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
goto out;
old_state = sk->state;
if (!((1<<old_state)&(TCPF_CLOSE|TCPF_LISTEN)))
goto out;
/* Really, if the socket is already in listen state
* we can only allow the backlog to be adjusted.
*/
if (old_state != TCP_LISTEN) {
err = tcp_listen_start(sk);
if (err)
goto out;
}
sk->max_ack_backlog = backlog;
err = 0;
out:
release_sock(sk);
return err;
}
/*
* Create an inet socket.
*/
static int inet_create(struct socket *sock, int protocol)
{
struct sock *sk;
struct list_head *p;
struct inet_protosw *answer;
sock->state = SS_UNCONNECTED;
sk = sk_alloc(PF_INET, GFP_KERNEL, 1);
if (sk == NULL)
goto do_oom;
/* Look for the requested type/protocol pair. */
answer = NULL;
br_read_lock_bh(BR_NETPROTO_LOCK);
list_for_each(p, &inetsw[sock->type]) {
answer = list_entry(p, struct inet_protosw, list);
/* Check the non-wild match. */
if (protocol == answer->protocol) {
if (protocol != IPPROTO_IP)
break;
} else {
/* Check for the two wild cases. */
if (IPPROTO_IP == protocol) {
protocol = answer->protocol;
break;
}
if (IPPROTO_IP == answer->protocol)
break;
}
answer = NULL;
}
br_read_unlock_bh(BR_NETPROTO_LOCK);
if (!answer)
goto free_and_badtype;
if (answer->capability > 0 && !capable(answer->capability))
goto free_and_badperm;
if (!protocol)
goto free_and_noproto;
sock->ops = answer->ops;
sk->prot = answer->prot;
sk->no_check = answer->no_check;
if (INET_PROTOSW_REUSE & answer->flags)
sk->reuse = 1;
if (SOCK_RAW == sock->type) {
sk->num = protocol;
if (IPPROTO_RAW == protocol)
sk->protinfo.af_inet.hdrincl = 1;
}
if (ipv4_config.no_pmtu_disc)
sk->protinfo.af_inet.pmtudisc = IP_PMTUDISC_DONT;
else
sk->protinfo.af_inet.pmtudisc = IP_PMTUDISC_WANT;
sk->protinfo.af_inet.id = 0;
sock_init_data(sock,sk);
sk->destruct = inet_sock_destruct;
sk->zapped = 0;
sk->family = PF_INET;
sk->protocol = protocol;
sk->backlog_rcv = sk->prot->backlog_rcv;
sk->protinfo.af_inet.ttl = sysctl_ip_default_ttl;
sk->protinfo.af_inet.mc_loop = 1;
sk->protinfo.af_inet.mc_ttl = 1;
sk->protinfo.af_inet.mc_index = 0;
sk->protinfo.af_inet.mc_list = NULL;
#ifdef INET_REFCNT_DEBUG
atomic_inc(&inet_sock_nr);
#endif
if (sk->num) {
/* It assumes that any protocol which allows
* the user to assign a number at socket
* creation time automatically
* shares.
*/
sk->sport = htons(sk->num);
/* Add to protocol hash chains. */
sk->prot->hash(sk);
}
if (sk->prot->init) {
int err = sk->prot->init(sk);
if (err != 0) {
inet_sock_release(sk);
return err;
}
}
return 0;
free_and_badtype:
sk_free(sk);
return -ESOCKTNOSUPPORT;
free_and_badperm:
sk_free(sk);
return -EPERM;
free_and_noproto:
sk_free(sk);
return -EPROTONOSUPPORT;
do_oom:
return -ENOBUFS;
}
/*
* The peer socket should always be NULL (or else). When we call this
* function we are destroying the object and from then on nobody
* should refer to it.
*/
int inet_release(struct socket *sock)
{
struct sock *sk = sock->sk;
if (sk) {
long timeout;
/* Applications forget to leave groups before exiting */
ip_mc_drop_socket(sk);
/* If linger is set, we don't return until the close
* is complete. Otherwise we return immediately. The
* actually closing is done the same either way.
*
* If the close is due to the process exiting, we never
* linger..
*/
timeout = 0;
if (sk->linger && !(current->flags & PF_EXITING))
timeout = sk->lingertime;
sock->sk = NULL;
sk->prot->close(sk, timeout);
}
return(0);
}
/* It is off by default, see below. */
int sysctl_ip_nonlocal_bind;
static int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
struct sockaddr_in *addr=(struct sockaddr_in *)uaddr;
struct sock *sk=sock->sk;
unsigned short snum;
int chk_addr_ret;
int err;
/* If the socket has its own bind function then use it. (RAW) */
if(sk->prot->bind)
return sk->prot->bind(sk, uaddr, addr_len);
if (addr_len < sizeof(struct sockaddr_in))
return -EINVAL;
chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr);
/* Not specified by any standard per-se, however it breaks too
* many applications when removed. It is unfortunate since
* allowing applications to make a non-local bind solves
* several problems with systems using dynamic addressing.
* (ie. your servers still start up even if your ISDN link
* is temporarily down)
*/
if (sysctl_ip_nonlocal_bind == 0 &&
sk->protinfo.af_inet.freebind == 0 &&
addr->sin_addr.s_addr != INADDR_ANY &&
chk_addr_ret != RTN_LOCAL &&
chk_addr_ret != RTN_MULTICAST &&
chk_addr_ret != RTN_BROADCAST)
return -EADDRNOTAVAIL;
snum = ntohs(addr->sin_port);
if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
return -EACCES;
/* We keep a pair of addresses. rcv_saddr is the one
* used by hash lookups, and saddr is used for transmit.
*
* In the BSD API these are the same except where it
* would be illegal to use them (multicast/broadcast) in
* which case the sending device address is used.
*/
lock_sock(sk);
/* Check these errors (active socket, double bind). */
err = -EINVAL;
if ((sk->state != TCP_CLOSE) ||
(sk->num != 0))
goto out;
sk->rcv_saddr = sk->saddr = addr->sin_addr.s_addr;
if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
sk->saddr = 0; /* Use device */
/* Make sure we are allowed to bind here. */
if (sk->prot->get_port(sk, snum) != 0) {
sk->saddr = sk->rcv_saddr = 0;
err = -EADDRINUSE;
goto out;
}
if (sk->rcv_saddr)
sk->userlocks |= SOCK_BINDADDR_LOCK;
if (snum)
sk->userlocks |= SOCK_BINDPORT_LOCK;
sk->sport = htons(sk->num);
sk->daddr = 0;
sk->dport = 0;
sk_dst_reset(sk);
err = 0;
out:
release_sock(sk);
return err;
}
int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr,
int addr_len, int flags)
{
struct sock *sk=sock->sk;
if (uaddr->sa_family == AF_UNSPEC)
return sk->prot->disconnect(sk, flags);
if (sk->num==0 && inet_autobind(sk) != 0)
return -EAGAIN;
return sk->prot->connect(sk, (struct sockaddr *)uaddr, addr_len);
}
static long inet_wait_for_connect(struct sock *sk, long timeo)
{
DECLARE_WAITQUEUE(wait, current);
__set_current_state(TASK_INTERRUPTIBLE);
add_wait_queue(sk->sleep, &wait);
/* Basic assumption: if someone sets sk->err, he _must_
* change state of the socket from TCP_SYN_*.
* Connect() does not allow to get error notifications
* without closing the socket.
*/
while ((1<<sk->state)&(TCPF_SYN_SENT|TCPF_SYN_RECV)) {
release_sock(sk);
timeo = schedule_timeout(timeo);
lock_sock(sk);
if (signal_pending(current) || !timeo)
break;
set_current_state(TASK_INTERRUPTIBLE);
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(sk->sleep, &wait);
return timeo;
}
/*
* Connect to a remote host. There is regrettably still a little
* TCP 'magic' in here.
*/
int inet_stream_connect(struct socket *sock, struct sockaddr * uaddr,
int addr_len, int flags)
{
struct sock *sk=sock->sk;
int err;
long timeo;
lock_sock(sk);
if (uaddr->sa_family == AF_UNSPEC) {
err = sk->prot->disconnect(sk, flags);
sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
goto out;
}
switch (sock->state) {
default:
err = -EINVAL;
goto out;
case SS_CONNECTED:
err = -EISCONN;
goto out;
case SS_CONNECTING:
err = -EALREADY;
/* Fall out of switch with err, set for this state */
break;
case SS_UNCONNECTED:
err = -EISCONN;
if (sk->state != TCP_CLOSE)
goto out;
err = -EAGAIN;
if (sk->num == 0) {
if (sk->prot->get_port(sk, 0) != 0)
goto out;
sk->sport = htons(sk->num);
}
err = sk->prot->connect(sk, uaddr, addr_len);
if (err < 0)
goto out;
sock->state = SS_CONNECTING;
/* Just entered SS_CONNECTING state; the only
* difference is that return value in non-blocking
* case is EINPROGRESS, rather than EALREADY.
*/
err = -EINPROGRESS;
break;
}
timeo = sock_sndtimeo(sk, flags&O_NONBLOCK);
if ((1<<sk->state)&(TCPF_SYN_SENT|TCPF_SYN_RECV)) {
/* Error code is set above */
if (!timeo || !inet_wait_for_connect(sk, timeo))
goto out;
err = sock_intr_errno(timeo);
if (signal_pending(current))
goto out;
}
/* Connection was closed by RST, timeout, ICMP error
* or another process disconnected us.
*/
if (sk->state == TCP_CLOSE)
goto sock_error;
/* sk->err may be not zero now, if RECVERR was ordered by user
* and error was received after socket entered established state.
* Hence, it is handled normally after connect() return successfully.
*/
sock->state = SS_CONNECTED;
err = 0;
out:
release_sock(sk);
return err;
sock_error:
err = sock_error(sk) ? : -ECONNABORTED;
sock->state = SS_UNCONNECTED;
if (sk->prot->disconnect(sk, flags))
sock->state = SS_DISCONNECTING;
goto out;
}
/*
* Accept a pending connection. The TCP layer now gives BSD semantics.
*/
int inet_accept(struct socket *sock, struct socket *newsock, int flags)
{
struct sock *sk1 = sock->sk;
struct sock *sk2;
int err = -EINVAL;
if((sk2 = sk1->prot->accept(sk1,flags,&err)) == NULL)
goto do_err;
lock_sock(sk2);
BUG_TRAP((1<<sk2->state)&(TCPF_ESTABLISHED|TCPF_CLOSE_WAIT|TCPF_CLOSE));
sock_graft(sk2, newsock);
newsock->state = SS_CONNECTED;
release_sock(sk2);
return 0;
do_err:
return err;
}
/*
* This does both peername and sockname.
*/
static int inet_getname(struct socket *sock, struct sockaddr *uaddr,
int *uaddr_len, int peer)
{
struct sock *sk = sock->sk;
struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
sin->sin_family = AF_INET;
if (peer) {
if (!sk->dport)
return -ENOTCONN;
if (((1<<sk->state)&(TCPF_CLOSE|TCPF_SYN_SENT)) && peer == 1)
return -ENOTCONN;
sin->sin_port = sk->dport;
sin->sin_addr.s_addr = sk->daddr;
} else {
__u32 addr = sk->rcv_saddr;
if (!addr)
addr = sk->saddr;
sin->sin_port = sk->sport;
sin->sin_addr.s_addr = addr;
}
*uaddr_len = sizeof(*sin);
return(0);
}
int inet_recvmsg(struct socket *sock, struct msghdr *msg, int size,
int flags, struct scm_cookie *scm)
{
struct sock *sk = sock->sk;
int addr_len = 0;
int err;
err = sk->prot->recvmsg(sk, msg, size, flags&MSG_DONTWAIT,
flags&~MSG_DONTWAIT, &addr_len);
if (err >= 0)
msg->msg_namelen = addr_len;
return err;
}
int inet_sendmsg(struct socket *sock, struct msghdr *msg, int size,
struct scm_cookie *scm)
{
struct sock *sk = sock->sk;
/* We may need to bind the socket. */
if (sk->num==0 && inet_autobind(sk) != 0)
return -EAGAIN;
return sk->prot->sendmsg(sk, msg, size);
}
int inet_shutdown(struct socket *sock, int how)
{
struct sock *sk = sock->sk;
int err = 0;
/* This should really check to make sure
* the socket is a TCP socket. (WHY AC...)
*/
how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
1->2 bit 2 snds.
2->3 */
if ((how & ~SHUTDOWN_MASK) || how==0) /* MAXINT->0 */
return -EINVAL;
lock_sock(sk);
if (sock->state == SS_CONNECTING) {
if ((1<<sk->state)&(TCPF_SYN_SENT|TCPF_SYN_RECV|TCPF_CLOSE))
sock->state = SS_DISCONNECTING;
else
sock->state = SS_CONNECTED;
}
switch (sk->state) {
case TCP_CLOSE:
err = -ENOTCONN;
/* Hack to wake up other listeners, who can poll for
POLLHUP, even on eg. unconnected UDP sockets -- RR */
default:
sk->shutdown |= how;
if (sk->prot->shutdown)
sk->prot->shutdown(sk, how);
break;
/* Remaining two branches are temporary solution for missing
* close() in multithreaded environment. It is _not_ a good idea,
* but we have no choice until close() is repaired at VFS level.
*/
case TCP_LISTEN:
if (!(how & RCV_SHUTDOWN))
break;
/* Fall through */
case TCP_SYN_SENT:
err = sk->prot->disconnect(sk, O_NONBLOCK);
sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
break;
}
/* Wake up anyone sleeping in poll. */
sk->state_change(sk);
release_sock(sk);
return err;
}
/*
* ioctl() calls you can issue on an INET socket. Most of these are
* device configuration and stuff and very rarely used. Some ioctls
* pass on to the socket itself.
*
* NOTE: I like the idea of a module for the config stuff. ie ifconfig
* loads the devconfigure module does its configuring and unloads it.
* There's a good 20K of config code hanging around the kernel.
*/
static int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
struct sock *sk = sock->sk;
int err;
int pid;
switch(cmd) {
case FIOSETOWN:
case SIOCSPGRP:
err = get_user(pid, (int *) arg);
if (err)
return err;
if (current->pid != pid && current->pgrp != -pid &&
!capable(CAP_NET_ADMIN))
return -EPERM;
sk->proc = pid;
return(0);
case FIOGETOWN:
case SIOCGPGRP:
return put_user(sk->proc, (int *)arg);
case SIOCGSTAMP:
if(sk->stamp.tv_sec==0)
return -ENOENT;
err = copy_to_user((void *)arg,&sk->stamp,sizeof(struct timeval));
if (err)
err = -EFAULT;
return err;
case SIOCADDRT:
case SIOCDELRT:
case SIOCRTMSG:
return(ip_rt_ioctl(cmd,(void *) arg));
case SIOCDARP:
case SIOCGARP:
case SIOCSARP:
return(arp_ioctl(cmd,(void *) arg));
case SIOCGIFADDR:
case SIOCSIFADDR:
case SIOCGIFBRDADDR:
case SIOCSIFBRDADDR:
case SIOCGIFNETMASK:
case SIOCSIFNETMASK:
case SIOCGIFDSTADDR:
case SIOCSIFDSTADDR:
case SIOCSIFPFLAGS:
case SIOCGIFPFLAGS:
case SIOCSIFFLAGS:
return(devinet_ioctl(cmd,(void *) arg));
case SIOCGIFBR:
case SIOCSIFBR:
#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
#ifdef CONFIG_KMOD
if (br_ioctl_hook == NULL)
request_module("bridge");
#endif
if (br_ioctl_hook != NULL)
return br_ioctl_hook(arg);
#endif
return -ENOPKG;
case SIOCGIFVLAN:
case SIOCSIFVLAN:
#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
#ifdef CONFIG_KMOD
if (vlan_ioctl_hook == NULL)
request_module("8021q");
#endif
if (vlan_ioctl_hook != NULL)
return vlan_ioctl_hook(arg);
#endif
return -ENOPKG;
case SIOCGIFDIVERT:
case SIOCSIFDIVERT:
#ifdef CONFIG_NET_DIVERT
return divert_ioctl(cmd, (struct divert_cf *) arg);
#else
return -ENOPKG;
#endif /* CONFIG_NET_DIVERT */
case SIOCADDDLCI:
case SIOCDELDLCI:
#ifdef CONFIG_DLCI
lock_kernel();
err = dlci_ioctl(cmd, (void *) arg);
unlock_kernel();
return err;
#endif
#ifdef CONFIG_DLCI_MODULE
#ifdef CONFIG_KMOD
if (dlci_ioctl_hook == NULL)
request_module("dlci");
#endif
if (dlci_ioctl_hook) {
lock_kernel();
err = (*dlci_ioctl_hook)(cmd, (void *) arg);
unlock_kernel();
return err;
}
#endif
return -ENOPKG;
default:
if ((cmd >= SIOCDEVPRIVATE) &&
(cmd <= (SIOCDEVPRIVATE + 15)))
return(dev_ioctl(cmd,(void *) arg));
#ifdef WIRELESS_EXT
if((cmd >= SIOCIWFIRST) && (cmd <= SIOCIWLAST))
return(dev_ioctl(cmd,(void *) arg));
#endif /* WIRELESS_EXT */
if (sk->prot->ioctl==NULL || (err=sk->prot->ioctl(sk, cmd, arg))==-ENOIOCTLCMD)
return(dev_ioctl(cmd,(void *) arg));
return err;
}
/*NOTREACHED*/
return(0);
}
struct proto_ops inet_stream_ops = {
family: PF_INET,
release: inet_release,
bind: inet_bind,
connect: inet_stream_connect,
socketpair: sock_no_socketpair,
accept: inet_accept,
getname: inet_getname,
poll: tcp_poll,
ioctl: inet_ioctl,
listen: inet_listen,
shutdown: inet_shutdown,
setsockopt: inet_setsockopt,
getsockopt: inet_getsockopt,
sendmsg: inet_sendmsg,
recvmsg: inet_recvmsg,
mmap: sock_no_mmap,
sendpage: tcp_sendpage
};
struct proto_ops inet_dgram_ops = {
family: PF_INET,
release: inet_release,
bind: inet_bind,
connect: inet_dgram_connect,
socketpair: sock_no_socketpair,
accept: sock_no_accept,
getname: inet_getname,
poll: datagram_poll,
ioctl: inet_ioctl,
listen: sock_no_listen,
shutdown: inet_shutdown,
setsockopt: inet_setsockopt,
getsockopt: inet_getsockopt,
sendmsg: inet_sendmsg,
recvmsg: inet_recvmsg,
mmap: sock_no_mmap,
sendpage: sock_no_sendpage,
};
struct net_proto_family inet_family_ops = {
family: PF_INET,
create: inet_create
};
extern void tcp_init(void);
extern void tcp_v4_init(struct net_proto_family *);
/* Upon startup we insert all the elements in inetsw_array[] into
* the linked list inetsw.
*/
static struct inet_protosw inetsw_array[] =
{
{
type: SOCK_STREAM,
protocol: IPPROTO_TCP,
prot: &tcp_prot,
ops: &inet_stream_ops,
capability: -1,
no_check: 0,
flags: INET_PROTOSW_PERMANENT,
},
{
type: SOCK_DGRAM,
protocol: IPPROTO_UDP,
prot: &udp_prot,
ops: &inet_dgram_ops,
capability: -1,
no_check: UDP_CSUM_DEFAULT,
flags: INET_PROTOSW_PERMANENT,
},
{
type: SOCK_RAW,
protocol: IPPROTO_IP, /* wild card */
prot: &raw_prot,
ops: &inet_dgram_ops,
capability: CAP_NET_RAW,
no_check: UDP_CSUM_DEFAULT,
flags: INET_PROTOSW_REUSE,
}
};
#define INETSW_ARRAY_LEN (sizeof(inetsw_array) / sizeof(struct inet_protosw))
void
inet_register_protosw(struct inet_protosw *p)
{
struct list_head *lh;
struct inet_protosw *answer;
int protocol = p->protocol;
br_write_lock_bh(BR_NETPROTO_LOCK);
if (p->type > SOCK_MAX)
goto out_illegal;
/* If we are trying to override a permanent protocol, bail. */
answer = NULL;
list_for_each(lh, &inetsw[p->type]) {
answer = list_entry(lh, struct inet_protosw, list);
/* Check only the non-wild match. */
if (protocol == answer->protocol &&
(INET_PROTOSW_PERMANENT & answer->flags))
break;
answer = NULL;
}
if (answer)
goto out_permanent;
/* Add to the BEGINNING so that we override any existing
* entry. This means that when we remove this entry, the
* system automatically returns to the old behavior.
*/
list_add(&p->list, &inetsw[p->type]);
out:
br_write_unlock_bh(BR_NETPROTO_LOCK);
return;
out_permanent:
printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
protocol);
goto out;
out_illegal:
printk(KERN_ERR
"Ignoring attempt to register illegal socket type %d.\n",
p->type);
goto out;
}
void
inet_unregister_protosw(struct inet_protosw *p)
{
if (INET_PROTOSW_PERMANENT & p->flags) {
printk(KERN_ERR
"Attempt to unregister permanent protocol %d.\n",
p->protocol);
} else {
br_write_lock_bh(BR_NETPROTO_LOCK);
list_del(&p->list);
br_write_unlock_bh(BR_NETPROTO_LOCK);
}
}
/*
* Called by socket.c on kernel startup.
*/
static int __init inet_init(void)
{
struct sk_buff *dummy_skb;
struct inet_protocol *p;
struct inet_protosw *q;
struct list_head *r;
printk(KERN_INFO "NET4: Linux TCP/IP 1.0 for NET4.0\n");
if (sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)) {
printk(KERN_CRIT "inet_proto_init: panic\n");
return -EINVAL;
}
/*
* Tell SOCKET that we are alive...
*/
(void) sock_register(&inet_family_ops);
/*
* Add all the protocols.
*/
printk(KERN_INFO "IP Protocols: ");
for (p = inet_protocol_base; p != NULL;) {
struct inet_protocol *tmp = (struct inet_protocol *) p->next;
inet_add_protocol(p);
printk("%s%s",p->name,tmp?", ":"\n");
p = tmp;
}
/* Register the socket-side information for inet_create. */
for(r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
INIT_LIST_HEAD(r);
for(q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
inet_register_protosw(q);
/*
* Set the ARP module up
*/
arp_init();
/*
* Set the IP module up
*/
ip_init();
tcp_v4_init(&inet_family_ops);
/* Setup TCP slab cache for open requests. */
tcp_init();
/*
* Set the ICMP layer up
*/
icmp_init(&inet_family_ops);
/* I wish inet_add_protocol had no constructor hook...
I had to move IPIP from net/ipv4/protocol.c :-( --ANK
*/
#ifdef CONFIG_NET_IPIP
ipip_init();
#endif
#ifdef CONFIG_NET_IPGRE
ipgre_init();
#endif
/*
* Initialise the multicast router
*/
#if defined(CONFIG_IP_MROUTE)
ip_mr_init();
#endif
/*
* Create all the /proc entries.
*/
#ifdef CONFIG_PROC_FS
proc_net_create ("raw", 0, raw_get_info);
proc_net_create ("netstat", 0, netstat_get_info);
proc_net_create ("snmp", 0, snmp_get_info);
proc_net_create ("sockstat", 0, afinet_get_info);
proc_net_create ("tcp", 0, tcp_get_info);
proc_net_create ("udp", 0, udp_get_info);
#endif /* CONFIG_PROC_FS */
return 0;
}
module_init(inet_init);
|