af_inet.c
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上传日期:2013-04-10
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文件大小:28k
- /*
- * 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 %pn",
- sk->state,
- sk);
- return;
- }
- if (!sk->dead) {
- printk("Attempt to release alive inet socket %pn", 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 aliven", 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=%dn", 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 = 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 NET4.0n");
- if (sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)) {
- printk(KERN_CRIT "inet_proto_init: panicn");
- 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);