af_inet.c

	 * XXX really change the sockets identity after
	 * XXX it has entered the hashes. -DaveM
	 *
	 * Besides that, it does not check for connection
	 * uniqueness. Wait for troubles.
	 */
	__sk_prot_rehash(sk);
	return 0;
}

int inet_sk_rebuild_header(struct sock *sk)
{
	struct inet_sock *inet = inet_sk(sk);
	struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
	u32 daddr;
	int err;

	/* Route is OK, nothing to do. */
	if (rt)
		return 0;

	/* Reroute. */
	daddr = inet->daddr;
	if (inet->opt && inet->opt->srr)
		daddr = inet->opt->faddr;
{
	struct flowi fl = {
		.oif = sk->sk_bound_dev_if,
		.nl_u = {
			.ip4_u = {
				.daddr	= daddr,
				.saddr	= inet->saddr,
				.tos	= RT_CONN_FLAGS(sk),
			},
		},
		.proto = sk->sk_protocol,
		.uli_u = {
			.ports = {
				.sport = inet->sport,
				.dport = inet->dport,
			},
		},
	};
						
	err = ip_route_output_flow(&rt, &fl, sk, 0);
}
	if (!err)
		sk_setup_caps(sk, &rt->u.dst);
	else {
		/* Routing failed... */
		sk->sk_route_caps = 0;
		/*
		 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
		 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
		 */
		if (!sysctl_ip_dynaddr ||
		    sk->sk_state != TCP_SYN_SENT ||
		    (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
		    (err = inet_sk_reselect_saddr(sk)) != 0)
			sk->sk_err_soft = -err;
	}

	return err;
}

EXPORT_SYMBOL(inet_sk_rebuild_header);

#ifdef CONFIG_IP_MULTICAST
static struct net_protocol igmp_protocol = {
	.handler =	igmp_rcv,
};
#endif

static struct net_protocol tcp_protocol = {
	.handler =	tcp_v4_rcv,
	.err_handler =	tcp_v4_err,
	.no_policy =	1,
};

static struct net_protocol udp_protocol = {
	.handler =	udp_rcv,
	.err_handler =	udp_err,
	.no_policy =	1,
};

static struct net_protocol icmp_protocol = {
	.handler =	icmp_rcv,
};

static int __init init_ipv4_mibs(void)
{
	net_statistics[0] = alloc_percpu(struct linux_mib);
	net_statistics[1] = alloc_percpu(struct linux_mib);
	ip_statistics[0] = alloc_percpu(struct ipstats_mib);
	ip_statistics[1] = alloc_percpu(struct ipstats_mib);
	icmp_statistics[0] = alloc_percpu(struct icmp_mib);
	icmp_statistics[1] = alloc_percpu(struct icmp_mib);
	tcp_statistics[0] = alloc_percpu(struct tcp_mib);
	tcp_statistics[1] = alloc_percpu(struct tcp_mib);
	udp_statistics[0] = alloc_percpu(struct udp_mib);
	udp_statistics[1] = alloc_percpu(struct udp_mib);
	if (!
	    (net_statistics[0] && net_statistics[1] && ip_statistics[0]
	     && ip_statistics[1] && tcp_statistics[0] && tcp_statistics[1]
	     && udp_statistics[0] && udp_statistics[1]))
		return -ENOMEM;

	(void) tcp_mib_init();

	return 0;
}

static int ipv4_proc_init(void);
extern void ipfrag_init(void);

/*
 *	IP protocol layer initialiser
 */

static struct packet_type ip_packet_type = {
	.type = __constant_htons(ETH_P_IP),
	.func = ip_rcv,
};

static int __init inet_init(void)
{
	struct sk_buff *dummy_skb;
	struct inet_protosw *q;
	struct list_head *r;
	int rc = -EINVAL;

	if (sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)) {
		printk(KERN_CRIT "%s: panic\n", __FUNCTION__);
		goto out;
	}

	rc = proto_register(&tcp_prot, 1);
	if (rc)
		goto out;

	rc = proto_register(&udp_prot, 1);
	if (rc)
		goto out_unregister_tcp_proto;

	rc = proto_register(&raw_prot, 1);
	if (rc)
		goto out_unregister_udp_proto;

	/*
	 *	Tell SOCKET that we are alive... 
	 */

  	(void)sock_register(&inet_family_ops);

	/*
	 *	Add all the base protocols.
	 */

	if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
		printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n");
	if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
		printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n");
	if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
		printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n");
#ifdef CONFIG_IP_MULTICAST
	if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
		printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n");
#endif

	/* 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);

	/*
	 *	Initialise the multicast router
	 */
#if defined(CONFIG_IP_MROUTE)
	ip_mr_init();
#endif
	/*
	 *	Initialise per-cpu ipv4 mibs
	 */ 

	if(init_ipv4_mibs())
		printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); ;
	
	ipv4_proc_init();

	ipfrag_init();

	dev_add_pack(&ip_packet_type);

	rc = 0;
out:
	return rc;
out_unregister_tcp_proto:
	proto_unregister(&tcp_prot);
out_unregister_udp_proto:
	proto_unregister(&udp_prot);
	goto out;
}

module_init(inet_init);

/* ------------------------------------------------------------------------ */

#ifdef CONFIG_PROC_FS
extern int  fib_proc_init(void);
extern void fib_proc_exit(void);
#ifdef CONFIG_IP_FIB_TRIE
extern int  fib_stat_proc_init(void);
extern void fib_stat_proc_exit(void);
#endif
extern int  ip_misc_proc_init(void);
extern int  raw_proc_init(void);
extern void raw_proc_exit(void);
extern int  tcp4_proc_init(void);
extern void tcp4_proc_exit(void);
extern int  udp4_proc_init(void);
extern void udp4_proc_exit(void);

static int __init ipv4_proc_init(void)
{
	int rc = 0;

	if (raw_proc_init())
		goto out_raw;
	if (tcp4_proc_init())
		goto out_tcp;
	if (udp4_proc_init())
		goto out_udp;
	if (fib_proc_init())
		goto out_fib;
#ifdef CONFIG_IP_FIB_TRIE
         if (fib_stat_proc_init())
                 goto out_fib_stat;
#endif
	if (ip_misc_proc_init())
		goto out_misc;
out:
	return rc;
out_misc:
#ifdef CONFIG_IP_FIB_TRIE
 	fib_stat_proc_exit();
out_fib_stat:
#endif
	fib_proc_exit();
out_fib:
	udp4_proc_exit();
out_udp:
	tcp4_proc_exit();
out_tcp:
	raw_proc_exit();
out_raw:
	rc = -ENOMEM;
	goto out;
}

#else /* CONFIG_PROC_FS */
static int __init ipv4_proc_init(void)
{
	return 0;
}
#endif /* CONFIG_PROC_FS */

MODULE_ALIAS_NETPROTO(PF_INET);

EXPORT_SYMBOL(inet_accept);
EXPORT_SYMBOL(inet_bind);
EXPORT_SYMBOL(inet_dgram_connect);
EXPORT_SYMBOL(inet_dgram_ops);
EXPORT_SYMBOL(inet_getname);
EXPORT_SYMBOL(inet_ioctl);
EXPORT_SYMBOL(inet_listen);
EXPORT_SYMBOL(inet_register_protosw);
EXPORT_SYMBOL(inet_release);
EXPORT_SYMBOL(inet_sendmsg);
EXPORT_SYMBOL(inet_shutdown);
EXPORT_SYMBOL(inet_sock_destruct);
EXPORT_SYMBOL(inet_stream_connect);
EXPORT_SYMBOL(inet_stream_ops);
EXPORT_SYMBOL(inet_unregister_protosw);
EXPORT_SYMBOL(net_statistics);
EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);