linux/net/ipv6/af_inet6.c
Herbert Xu 497c615aba [IPV6]: Audit all ip6_dst_lookup/ip6_dst_store calls
The current users of ip6_dst_lookup can be divided into two classes:

1) The caller holds no locks and is in user-context (UDP).
2) The caller does not want to lookup the dst cache at all.

The second class covers everyone except UDP because most people do
the cache lookup directly before calling ip6_dst_lookup.  This patch
adds ip6_sk_dst_lookup for the first class.

Similarly ip6_dst_store users can be divded into those that need to
take the socket dst lock and those that don't.  This patch adds
__ip6_dst_store for those (everyone except UDP/datagram) that don't
need an extra lock.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-08-02 13:38:14 -07:00

943 lines
22 KiB
C

/*
* PF_INET6 socket protocol family
* Linux INET6 implementation
*
* Authors:
* Pedro Roque <roque@di.fc.ul.pt>
*
* Adapted from linux/net/ipv4/af_inet.c
*
* $Id: af_inet6.c,v 1.66 2002/02/01 22:01:04 davem Exp $
*
* Fixes:
* piggy, Karl Knutson : Socket protocol table
* Hideaki YOSHIFUJI : sin6_scope_id support
* Arnaldo Melo : check proc_net_create return, cleanups
*
* 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/module.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.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/inet.h>
#include <linux/netdevice.h>
#include <linux/icmpv6.h>
#include <linux/smp_lock.h>
#include <linux/netfilter_ipv6.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/udp.h>
#include <net/tcp.h>
#include <net/ipip.h>
#include <net/protocol.h>
#include <net/inet_common.h>
#include <net/transp_v6.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
#ifdef CONFIG_IPV6_TUNNEL
#include <net/ip6_tunnel.h>
#endif
#include <asm/uaccess.h>
#include <asm/system.h>
MODULE_AUTHOR("Cast of dozens");
MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
MODULE_LICENSE("GPL");
int sysctl_ipv6_bindv6only;
/* The inetsw table contains everything that inet_create needs to
* build a new socket.
*/
static struct list_head inetsw6[SOCK_MAX];
static DEFINE_SPINLOCK(inetsw6_lock);
static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
{
const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
}
static int inet6_create(struct socket *sock, int protocol)
{
struct inet_sock *inet;
struct ipv6_pinfo *np;
struct sock *sk;
struct list_head *p;
struct inet_protosw *answer;
struct proto *answer_prot;
unsigned char answer_flags;
char answer_no_check;
int try_loading_module = 0;
int err;
/* Look for the requested type/protocol pair. */
answer = NULL;
lookup_protocol:
err = -ESOCKTNOSUPPORT;
rcu_read_lock();
list_for_each_rcu(p, &inetsw6[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;
}
err = -EPROTONOSUPPORT;
answer = NULL;
}
if (!answer) {
if (try_loading_module < 2) {
rcu_read_unlock();
/*
* Be more specific, e.g. net-pf-10-proto-132-type-1
* (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
*/
if (++try_loading_module == 1)
request_module("net-pf-%d-proto-%d-type-%d",
PF_INET6, protocol, sock->type);
/*
* Fall back to generic, e.g. net-pf-10-proto-132
* (net-pf-PF_INET6-proto-IPPROTO_SCTP)
*/
else
request_module("net-pf-%d-proto-%d",
PF_INET6, protocol);
goto lookup_protocol;
} else
goto out_rcu_unlock;
}
err = -EPERM;
if (answer->capability > 0 && !capable(answer->capability))
goto out_rcu_unlock;
sock->ops = answer->ops;
answer_prot = answer->prot;
answer_no_check = answer->no_check;
answer_flags = answer->flags;
rcu_read_unlock();
BUG_TRAP(answer_prot->slab != NULL);
err = -ENOBUFS;
sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
if (sk == NULL)
goto out;
sock_init_data(sock, sk);
err = 0;
sk->sk_no_check = answer_no_check;
if (INET_PROTOSW_REUSE & answer_flags)
sk->sk_reuse = 1;
inet = inet_sk(sk);
inet->is_icsk = INET_PROTOSW_ICSK & answer_flags;
if (SOCK_RAW == sock->type) {
inet->num = protocol;
if (IPPROTO_RAW == protocol)
inet->hdrincl = 1;
}
sk->sk_destruct = inet_sock_destruct;
sk->sk_family = PF_INET6;
sk->sk_protocol = protocol;
sk->sk_backlog_rcv = answer->prot->backlog_rcv;
inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
np->hop_limit = -1;
np->mcast_hops = -1;
np->mc_loop = 1;
np->pmtudisc = IPV6_PMTUDISC_WANT;
np->ipv6only = sysctl_ipv6_bindv6only;
/* Init the ipv4 part of the socket since we can have sockets
* using v6 API for ipv4.
*/
inet->uc_ttl = -1;
inet->mc_loop = 1;
inet->mc_ttl = 1;
inet->mc_index = 0;
inet->mc_list = NULL;
if (ipv4_config.no_pmtu_disc)
inet->pmtudisc = IP_PMTUDISC_DONT;
else
inet->pmtudisc = IP_PMTUDISC_WANT;
/*
* Increment only the relevant sk_prot->socks debug field, this changes
* the previous behaviour of incrementing both the equivalent to
* answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
*
* This allows better debug granularity as we'll know exactly how many
* UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
* transport protocol socks. -acme
*/
sk_refcnt_debug_inc(sk);
if (inet->num) {
/* It assumes that any protocol which allows
* the user to assign a number at socket
* creation time automatically shares.
*/
inet->sport = ntohs(inet->num);
sk->sk_prot->hash(sk);
}
if (sk->sk_prot->init) {
err = sk->sk_prot->init(sk);
if (err) {
sk_common_release(sk);
goto out;
}
}
out:
return err;
out_rcu_unlock:
rcu_read_unlock();
goto out;
}
/* bind for INET6 API */
int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
struct sock *sk = sock->sk;
struct inet_sock *inet = inet_sk(sk);
struct ipv6_pinfo *np = inet6_sk(sk);
__u32 v4addr = 0;
unsigned short snum;
int addr_type = 0;
int err = 0;
/* If the socket has its own bind function then use it. */
if (sk->sk_prot->bind)
return sk->sk_prot->bind(sk, uaddr, addr_len);
if (addr_len < SIN6_LEN_RFC2133)
return -EINVAL;
addr_type = ipv6_addr_type(&addr->sin6_addr);
if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
return -EINVAL;
snum = ntohs(addr->sin6_port);
if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
return -EACCES;
lock_sock(sk);
/* Check these errors (active socket, double bind). */
if (sk->sk_state != TCP_CLOSE || inet->num) {
err = -EINVAL;
goto out;
}
/* Check if the address belongs to the host. */
if (addr_type == IPV6_ADDR_MAPPED) {
v4addr = addr->sin6_addr.s6_addr32[3];
if (inet_addr_type(v4addr) != RTN_LOCAL) {
err = -EADDRNOTAVAIL;
goto out;
}
} else {
if (addr_type != IPV6_ADDR_ANY) {
struct net_device *dev = NULL;
if (addr_type & IPV6_ADDR_LINKLOCAL) {
if (addr_len >= sizeof(struct sockaddr_in6) &&
addr->sin6_scope_id) {
/* Override any existing binding, if another one
* is supplied by user.
*/
sk->sk_bound_dev_if = addr->sin6_scope_id;
}
/* Binding to link-local address requires an interface */
if (!sk->sk_bound_dev_if) {
err = -EINVAL;
goto out;
}
dev = dev_get_by_index(sk->sk_bound_dev_if);
if (!dev) {
err = -ENODEV;
goto out;
}
}
/* ipv4 addr of the socket is invalid. Only the
* unspecified and mapped address have a v4 equivalent.
*/
v4addr = LOOPBACK4_IPV6;
if (!(addr_type & IPV6_ADDR_MULTICAST)) {
if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
if (dev)
dev_put(dev);
err = -EADDRNOTAVAIL;
goto out;
}
}
if (dev)
dev_put(dev);
}
}
inet->rcv_saddr = v4addr;
inet->saddr = v4addr;
ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);
if (!(addr_type & IPV6_ADDR_MULTICAST))
ipv6_addr_copy(&np->saddr, &addr->sin6_addr);
/* Make sure we are allowed to bind here. */
if (sk->sk_prot->get_port(sk, snum)) {
inet_reset_saddr(sk);
err = -EADDRINUSE;
goto out;
}
if (addr_type != IPV6_ADDR_ANY)
sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
if (snum)
sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
inet->sport = ntohs(inet->num);
inet->dport = 0;
inet->daddr = 0;
out:
release_sock(sk);
return err;
}
int inet6_release(struct socket *sock)
{
struct sock *sk = sock->sk;
if (sk == NULL)
return -EINVAL;
/* Free mc lists */
ipv6_sock_mc_close(sk);
/* Free ac lists */
ipv6_sock_ac_close(sk);
return inet_release(sock);
}
int inet6_destroy_sock(struct sock *sk)
{
struct ipv6_pinfo *np = inet6_sk(sk);
struct sk_buff *skb;
struct ipv6_txoptions *opt;
/* Release rx options */
if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
kfree_skb(skb);
/* Free flowlabels */
fl6_free_socklist(sk);
/* Free tx options */
if ((opt = xchg(&np->opt, NULL)) != NULL)
sock_kfree_s(sk, opt, opt->tot_len);
return 0;
}
EXPORT_SYMBOL_GPL(inet6_destroy_sock);
/*
* This does both peername and sockname.
*/
int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
int *uaddr_len, int peer)
{
struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
struct sock *sk = sock->sk;
struct inet_sock *inet = inet_sk(sk);
struct ipv6_pinfo *np = inet6_sk(sk);
sin->sin6_family = AF_INET6;
sin->sin6_flowinfo = 0;
sin->sin6_scope_id = 0;
if (peer) {
if (!inet->dport)
return -ENOTCONN;
if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
peer == 1)
return -ENOTCONN;
sin->sin6_port = inet->dport;
ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
if (np->sndflow)
sin->sin6_flowinfo = np->flow_label;
} else {
if (ipv6_addr_any(&np->rcv_saddr))
ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
else
ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);
sin->sin6_port = inet->sport;
}
if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
sin->sin6_scope_id = sk->sk_bound_dev_if;
*uaddr_len = sizeof(*sin);
return(0);
}
int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
struct sock *sk = sock->sk;
switch(cmd)
{
case SIOCGSTAMP:
return sock_get_timestamp(sk, (struct timeval __user *)arg);
case SIOCADDRT:
case SIOCDELRT:
return(ipv6_route_ioctl(cmd,(void __user *)arg));
case SIOCSIFADDR:
return addrconf_add_ifaddr((void __user *) arg);
case SIOCDIFADDR:
return addrconf_del_ifaddr((void __user *) arg);
case SIOCSIFDSTADDR:
return addrconf_set_dstaddr((void __user *) arg);
default:
if (!sk->sk_prot->ioctl)
return -ENOIOCTLCMD;
return sk->sk_prot->ioctl(sk, cmd, arg);
}
/*NOTREACHED*/
return(0);
}
const struct proto_ops inet6_stream_ops = {
.family = PF_INET6,
.owner = THIS_MODULE,
.release = inet6_release,
.bind = inet6_bind,
.connect = inet_stream_connect, /* ok */
.socketpair = sock_no_socketpair, /* a do nothing */
.accept = inet_accept, /* ok */
.getname = inet6_getname,
.poll = tcp_poll, /* ok */
.ioctl = inet6_ioctl, /* must change */
.listen = inet_listen, /* ok */
.shutdown = inet_shutdown, /* ok */
.setsockopt = sock_common_setsockopt, /* ok */
.getsockopt = sock_common_getsockopt, /* ok */
.sendmsg = inet_sendmsg, /* ok */
.recvmsg = sock_common_recvmsg, /* ok */
.mmap = sock_no_mmap,
.sendpage = tcp_sendpage,
#ifdef CONFIG_COMPAT
.compat_setsockopt = compat_sock_common_setsockopt,
.compat_getsockopt = compat_sock_common_getsockopt,
#endif
};
const struct proto_ops inet6_dgram_ops = {
.family = PF_INET6,
.owner = THIS_MODULE,
.release = inet6_release,
.bind = inet6_bind,
.connect = inet_dgram_connect, /* ok */
.socketpair = sock_no_socketpair, /* a do nothing */
.accept = sock_no_accept, /* a do nothing */
.getname = inet6_getname,
.poll = udp_poll, /* ok */
.ioctl = inet6_ioctl, /* must change */
.listen = sock_no_listen, /* ok */
.shutdown = inet_shutdown, /* ok */
.setsockopt = sock_common_setsockopt, /* ok */
.getsockopt = sock_common_getsockopt, /* ok */
.sendmsg = inet_sendmsg, /* ok */
.recvmsg = sock_common_recvmsg, /* ok */
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage,
#ifdef CONFIG_COMPAT
.compat_setsockopt = compat_sock_common_setsockopt,
.compat_getsockopt = compat_sock_common_getsockopt,
#endif
};
static struct net_proto_family inet6_family_ops = {
.family = PF_INET6,
.create = inet6_create,
.owner = THIS_MODULE,
};
/* Same as inet6_dgram_ops, sans udp_poll. */
static const struct proto_ops inet6_sockraw_ops = {
.family = PF_INET6,
.owner = THIS_MODULE,
.release = inet6_release,
.bind = inet6_bind,
.connect = inet_dgram_connect, /* ok */
.socketpair = sock_no_socketpair, /* a do nothing */
.accept = sock_no_accept, /* a do nothing */
.getname = inet6_getname,
.poll = datagram_poll, /* ok */
.ioctl = inet6_ioctl, /* must change */
.listen = sock_no_listen, /* ok */
.shutdown = inet_shutdown, /* ok */
.setsockopt = sock_common_setsockopt, /* ok */
.getsockopt = sock_common_getsockopt, /* ok */
.sendmsg = inet_sendmsg, /* ok */
.recvmsg = sock_common_recvmsg, /* ok */
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage,
#ifdef CONFIG_COMPAT
.compat_setsockopt = compat_sock_common_setsockopt,
.compat_getsockopt = compat_sock_common_getsockopt,
#endif
};
static struct inet_protosw rawv6_protosw = {
.type = SOCK_RAW,
.protocol = IPPROTO_IP, /* wild card */
.prot = &rawv6_prot,
.ops = &inet6_sockraw_ops,
.capability = CAP_NET_RAW,
.no_check = UDP_CSUM_DEFAULT,
.flags = INET_PROTOSW_REUSE,
};
void
inet6_register_protosw(struct inet_protosw *p)
{
struct list_head *lh;
struct inet_protosw *answer;
int protocol = p->protocol;
struct list_head *last_perm;
spin_lock_bh(&inetsw6_lock);
if (p->type >= SOCK_MAX)
goto out_illegal;
/* If we are trying to override a permanent protocol, bail. */
answer = NULL;
last_perm = &inetsw6[p->type];
list_for_each(lh, &inetsw6[p->type]) {
answer = list_entry(lh, struct inet_protosw, list);
/* Check only the non-wild match. */
if (INET_PROTOSW_PERMANENT & answer->flags) {
if (protocol == answer->protocol)
break;
last_perm = lh;
}
answer = NULL;
}
if (answer)
goto out_permanent;
/* Add the new entry after the last permanent entry if any, so that
* the new entry does not override a permanent entry when matched with
* a wild-card protocol. But it is allowed to override any existing
* non-permanent entry. This means that when we remove this entry, the
* system automatically returns to the old behavior.
*/
list_add_rcu(&p->list, last_perm);
out:
spin_unlock_bh(&inetsw6_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 invalid socket type %d.\n",
p->type);
goto out;
}
void
inet6_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 {
spin_lock_bh(&inetsw6_lock);
list_del_rcu(&p->list);
spin_unlock_bh(&inetsw6_lock);
synchronize_net();
}
}
int inet6_sk_rebuild_header(struct sock *sk)
{
int err;
struct dst_entry *dst;
struct ipv6_pinfo *np = inet6_sk(sk);
dst = __sk_dst_check(sk, np->dst_cookie);
if (dst == NULL) {
struct inet_sock *inet = inet_sk(sk);
struct in6_addr *final_p = NULL, final;
struct flowi fl;
memset(&fl, 0, sizeof(fl));
fl.proto = sk->sk_protocol;
ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
ipv6_addr_copy(&fl.fl6_src, &np->saddr);
fl.fl6_flowlabel = np->flow_label;
fl.oif = sk->sk_bound_dev_if;
fl.fl_ip_dport = inet->dport;
fl.fl_ip_sport = inet->sport;
if (np->opt && np->opt->srcrt) {
struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
ipv6_addr_copy(&final, &fl.fl6_dst);
ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
final_p = &final;
}
err = ip6_dst_lookup(sk, &dst, &fl);
if (err) {
sk->sk_route_caps = 0;
return err;
}
if (final_p)
ipv6_addr_copy(&fl.fl6_dst, final_p);
if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
sk->sk_err_soft = -err;
return err;
}
__ip6_dst_store(sk, dst, NULL);
}
return 0;
}
EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
{
struct ipv6_pinfo *np = inet6_sk(sk);
struct inet6_skb_parm *opt = IP6CB(skb);
if (np->rxopt.all) {
if ((opt->hop && (np->rxopt.bits.hopopts ||
np->rxopt.bits.ohopopts)) ||
((IPV6_FLOWINFO_MASK & *(u32*)skb->nh.raw) &&
np->rxopt.bits.rxflow) ||
(opt->srcrt && (np->rxopt.bits.srcrt ||
np->rxopt.bits.osrcrt)) ||
((opt->dst1 || opt->dst0) &&
(np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
return 1;
}
return 0;
}
EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
int
snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
{
if (ptr == NULL)
return -EINVAL;
ptr[0] = __alloc_percpu(mibsize);
if (!ptr[0])
goto err0;
ptr[1] = __alloc_percpu(mibsize);
if (!ptr[1])
goto err1;
return 0;
err1:
free_percpu(ptr[0]);
ptr[0] = NULL;
err0:
return -ENOMEM;
}
void
snmp6_mib_free(void *ptr[2])
{
if (ptr == NULL)
return;
if (ptr[0])
free_percpu(ptr[0]);
if (ptr[1])
free_percpu(ptr[1]);
ptr[0] = ptr[1] = NULL;
}
static int __init init_ipv6_mibs(void)
{
if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
__alignof__(struct ipstats_mib)) < 0)
goto err_ip_mib;
if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
__alignof__(struct icmpv6_mib)) < 0)
goto err_icmp_mib;
if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
__alignof__(struct udp_mib)) < 0)
goto err_udp_mib;
return 0;
err_udp_mib:
snmp6_mib_free((void **)icmpv6_statistics);
err_icmp_mib:
snmp6_mib_free((void **)ipv6_statistics);
err_ip_mib:
return -ENOMEM;
}
static void cleanup_ipv6_mibs(void)
{
snmp6_mib_free((void **)ipv6_statistics);
snmp6_mib_free((void **)icmpv6_statistics);
snmp6_mib_free((void **)udp_stats_in6);
}
static int __init inet6_init(void)
{
struct sk_buff *dummy_skb;
struct list_head *r;
int err;
#ifdef MODULE
#if 0 /* FIXME --RR */
if (!mod_member_present(&__this_module, can_unload))
return -EINVAL;
__this_module.can_unload = &ipv6_unload;
#endif
#endif
if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) {
printk(KERN_CRIT "inet6_proto_init: size fault\n");
return -EINVAL;
}
err = proto_register(&tcpv6_prot, 1);
if (err)
goto out;
err = proto_register(&udpv6_prot, 1);
if (err)
goto out_unregister_tcp_proto;
err = proto_register(&rawv6_prot, 1);
if (err)
goto out_unregister_udp_proto;
/* Register the socket-side information for inet6_create. */
for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
INIT_LIST_HEAD(r);
/* We MUST register RAW sockets before we create the ICMP6,
* IGMP6, or NDISC control sockets.
*/
inet6_register_protosw(&rawv6_protosw);
/* Register the family here so that the init calls below will
* be able to create sockets. (?? is this dangerous ??)
*/
err = sock_register(&inet6_family_ops);
if (err)
goto out_unregister_raw_proto;
/* Initialise ipv6 mibs */
err = init_ipv6_mibs();
if (err)
goto out_unregister_sock;
/*
* ipngwg API draft makes clear that the correct semantics
* for TCP and UDP is to consider one TCP and UDP instance
* in a host availiable by both INET and INET6 APIs and
* able to communicate via both network protocols.
*/
#ifdef CONFIG_SYSCTL
ipv6_sysctl_register();
#endif
err = icmpv6_init(&inet6_family_ops);
if (err)
goto icmp_fail;
err = ndisc_init(&inet6_family_ops);
if (err)
goto ndisc_fail;
err = igmp6_init(&inet6_family_ops);
if (err)
goto igmp_fail;
err = ipv6_netfilter_init();
if (err)
goto netfilter_fail;
/* Create /proc/foo6 entries. */
#ifdef CONFIG_PROC_FS
err = -ENOMEM;
if (raw6_proc_init())
goto proc_raw6_fail;
if (tcp6_proc_init())
goto proc_tcp6_fail;
if (udp6_proc_init())
goto proc_udp6_fail;
if (ipv6_misc_proc_init())
goto proc_misc6_fail;
if (ac6_proc_init())
goto proc_anycast6_fail;
if (if6_proc_init())
goto proc_if6_fail;
#endif
ip6_route_init();
ip6_flowlabel_init();
err = addrconf_init();
if (err)
goto addrconf_fail;
sit_init();
/* Init v6 extension headers. */
ipv6_rthdr_init();
ipv6_frag_init();
ipv6_nodata_init();
ipv6_destopt_init();
/* Init v6 transport protocols. */
udpv6_init();
tcpv6_init();
ipv6_packet_init();
err = 0;
out:
return err;
addrconf_fail:
ip6_flowlabel_cleanup();
ip6_route_cleanup();
#ifdef CONFIG_PROC_FS
if6_proc_exit();
proc_if6_fail:
ac6_proc_exit();
proc_anycast6_fail:
ipv6_misc_proc_exit();
proc_misc6_fail:
udp6_proc_exit();
proc_udp6_fail:
tcp6_proc_exit();
proc_tcp6_fail:
raw6_proc_exit();
proc_raw6_fail:
#endif
ipv6_netfilter_fini();
netfilter_fail:
igmp6_cleanup();
igmp_fail:
ndisc_cleanup();
ndisc_fail:
icmpv6_cleanup();
icmp_fail:
#ifdef CONFIG_SYSCTL
ipv6_sysctl_unregister();
#endif
cleanup_ipv6_mibs();
out_unregister_sock:
sock_unregister(PF_INET6);
out_unregister_raw_proto:
proto_unregister(&rawv6_prot);
out_unregister_udp_proto:
proto_unregister(&udpv6_prot);
out_unregister_tcp_proto:
proto_unregister(&tcpv6_prot);
goto out;
}
module_init(inet6_init);
static void __exit inet6_exit(void)
{
/* First of all disallow new sockets creation. */
sock_unregister(PF_INET6);
#ifdef CONFIG_PROC_FS
if6_proc_exit();
ac6_proc_exit();
ipv6_misc_proc_exit();
udp6_proc_exit();
tcp6_proc_exit();
raw6_proc_exit();
#endif
/* Cleanup code parts. */
sit_cleanup();
ip6_flowlabel_cleanup();
addrconf_cleanup();
ip6_route_cleanup();
ipv6_packet_cleanup();
igmp6_cleanup();
ipv6_netfilter_fini();
ndisc_cleanup();
icmpv6_cleanup();
#ifdef CONFIG_SYSCTL
ipv6_sysctl_unregister();
#endif
cleanup_ipv6_mibs();
proto_unregister(&rawv6_prot);
proto_unregister(&udpv6_prot);
proto_unregister(&tcpv6_prot);
}
module_exit(inet6_exit);
MODULE_ALIAS_NETPROTO(PF_INET6);