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/*
* 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 1.65 2001/10/02 02:22:36 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/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/version.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/icmpv6.h>
#include <linux/brlock.h>
#include <linux/smp_lock.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>
#include <asm/uaccess.h>
#include <asm/system.h>
#ifdef MODULE
static int unloadable = 0; /* XX: Turn to one when all is ok within the
module for allowing unload */
#endif
#if defined(MODULE) && LINUX_VERSION_CODE > 0x20115
MODULE_AUTHOR("Cast of dozens");
MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
MODULE_PARM(unloadable, "i");
#endif
/* IPv6 procfs goodies... */
#ifdef CONFIG_PROC_FS
extern int raw6_get_info(char *, char **, off_t, int);
extern int tcp6_get_info(char *, char **, off_t, int);
extern int udp6_get_info(char *, char **, off_t, int);
extern int afinet6_get_info(char *, char **, off_t, int);
extern int afinet6_get_snmp(char *, char **, off_t, int);
#endif
#ifdef CONFIG_SYSCTL
extern void ipv6_sysctl_register(void);
extern void ipv6_sysctl_unregister(void);
#endif
#ifdef INET_REFCNT_DEBUG
atomic_t inet6_sock_nr;
#endif
/* The inetsw table contains everything that inet_create needs to
* build a new socket.
*/
struct list_head inetsw6[SOCK_MAX];
static void inet6_sock_destruct(struct sock *sk)
{
inet_sock_destruct(sk);
#ifdef INET_REFCNT_DEBUG
atomic_dec(&inet6_sock_nr);
#endif
MOD_DEC_USE_COUNT;
}
static int inet6_create(struct socket *sock, int protocol)
{
struct sock *sk;
struct list_head *p;
struct inet_protosw *answer;
sk = sk_alloc(PF_INET6, 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, &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;
}
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;
sock_init_data(sock, sk);
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;
}
sk->destruct = inet6_sock_destruct;
sk->zapped = 0;
sk->family = PF_INET6;
sk->protocol = protocol;
sk->backlog_rcv = answer->prot->backlog_rcv;
sk->net_pinfo.af_inet6.hop_limit = -1;
sk->net_pinfo.af_inet6.mcast_hops = -1;
sk->net_pinfo.af_inet6.mc_loop = 1;
sk->net_pinfo.af_inet6.pmtudisc = IPV6_PMTUDISC_WANT;
/* Init the ipv4 part of the socket since we can have sockets
* using v6 API for ipv4.
*/
sk->protinfo.af_inet.ttl = 64;
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;
if (ipv4_config.no_pmtu_disc)
sk->protinfo.af_inet.pmtudisc = IP_PMTUDISC_DONT;
else
sk->protinfo.af_inet.pmtudisc = IP_PMTUDISC_WANT;
#ifdef INET_REFCNT_DEBUG
atomic_inc(&inet6_sock_nr);
atomic_inc(&inet_sock_nr);
#endif
MOD_INC_USE_COUNT;
if (sk->num) {
/* It assumes that any protocol which allows
* the user to assign a number at socket
* creation time automatically shares.
*/
sk->sport = ntohs(sk->num);
sk->prot->hash(sk);
}
if (sk->prot->init) {
int err = sk->prot->init(sk);
if (err != 0) {
MOD_DEC_USE_COUNT;
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;
}
/* bind for INET6 API */
static 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;
__u32 v4addr = 0;
unsigned short snum;
int addr_type = 0;
/* If the socket has its own bind function then use it. */
if(sk->prot->bind)
return 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;
/* 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)
return -EADDRNOTAVAIL;
} else {
if (addr_type != IPV6_ADDR_ANY) {
/* ipv4 addr of the socket is invalid. Only the
* unpecified and mapped address have a v4 equivalent.
*/
v4addr = LOOPBACK4_IPV6;
if (!(addr_type & IPV6_ADDR_MULTICAST)) {
if (!ipv6_chk_addr(&addr->sin6_addr, NULL))
return -EADDRNOTAVAIL;
}
}
}
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->state != TCP_CLOSE) ||
(sk->num != 0)) {
release_sock(sk);
return -EINVAL;
}
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->bound_dev_if = addr->sin6_scope_id;
}
/* Binding to link-local address requires an interface */
if (sk->bound_dev_if == 0) {
release_sock(sk);
return -EINVAL;
}
}
sk->rcv_saddr = v4addr;
sk->saddr = v4addr;
ipv6_addr_copy(&sk->net_pinfo.af_inet6.rcv_saddr, &addr->sin6_addr);
if (!(addr_type & IPV6_ADDR_MULTICAST))
ipv6_addr_copy(&sk->net_pinfo.af_inet6.saddr, &addr->sin6_addr);
/* Make sure we are allowed to bind here. */
if (sk->prot->get_port(sk, snum) != 0) {
sk->rcv_saddr = 0;
sk->saddr = 0;
memset(&sk->net_pinfo.af_inet6.rcv_saddr, 0, sizeof(struct in6_addr));
memset(&sk->net_pinfo.af_inet6.saddr, 0, sizeof(struct in6_addr));
release_sock(sk);
return -EADDRINUSE;
}
if (addr_type != IPV6_ADDR_ANY)
sk->userlocks |= SOCK_BINDADDR_LOCK;
if (snum)
sk->userlocks |= SOCK_BINDPORT_LOCK;
sk->sport = ntohs(sk->num);
sk->dport = 0;
sk->daddr = 0;
release_sock(sk);
return 0;
}
static int inet6_release(struct socket *sock)
{
struct sock *sk = sock->sk;
if (sk == NULL)
return -EINVAL;
/* Free mc lists */
ipv6_sock_mc_close(sk);
return inet_release(sock);
}
int inet6_destroy_sock(struct sock *sk)
{
struct sk_buff *skb;
struct ipv6_txoptions *opt;
/*
* Release destination entry
*/
sk_dst_reset(sk);
/* Release rx options */
if ((skb = xchg(&sk->net_pinfo.af_inet6.pktoptions, NULL)) != NULL)
kfree_skb(skb);
/* Free flowlabels */
fl6_free_socklist(sk);
/* Free tx options */
if ((opt = xchg(&sk->net_pinfo.af_inet6.opt, NULL)) != NULL)
sock_kfree_s(sk, opt, opt->tot_len);
return 0;
}
/*
* This does both peername and sockname.
*/
static 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;
sin->sin6_family = AF_INET6;
sin->sin6_flowinfo = 0;
sin->sin6_scope_id = 0;
if (peer) {
if (!sk->dport)
return -ENOTCONN;
if (((1<<sk->state)&(TCPF_CLOSE|TCPF_SYN_SENT)) && peer == 1)
return -ENOTCONN;
sin->sin6_port = sk->dport;
memcpy(&sin->sin6_addr, &sk->net_pinfo.af_inet6.daddr,
sizeof(struct in6_addr));
if (sk->net_pinfo.af_inet6.sndflow)
sin->sin6_flowinfo = sk->net_pinfo.af_inet6.flow_label;
} else {
if (ipv6_addr_type(&sk->net_pinfo.af_inet6.rcv_saddr) == IPV6_ADDR_ANY)
memcpy(&sin->sin6_addr,
&sk->net_pinfo.af_inet6.saddr,
sizeof(struct in6_addr));
else
memcpy(&sin->sin6_addr,
&sk->net_pinfo.af_inet6.rcv_saddr,
sizeof(struct in6_addr));
sin->sin6_port = sk->sport;
}
if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
sin->sin6_scope_id = sk->bound_dev_if;
*uaddr_len = sizeof(*sin);
return(0);
}
static int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
struct sock *sk = sock->sk;
int err = -EINVAL;
int pid;
switch(cmd)
{
case FIOSETOWN:
case SIOCSPGRP:
if (get_user(pid, (int *) arg))
return -EFAULT;
/* see sock_no_fcntl */
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)
return -EFAULT;
return 0;
case SIOCADDRT:
case SIOCDELRT:
return(ipv6_route_ioctl(cmd,(void *)arg));
case SIOCSIFADDR:
return addrconf_add_ifaddr((void *) arg);
case SIOCDIFADDR:
return addrconf_del_ifaddr((void *) arg);
case SIOCSIFDSTADDR:
return addrconf_set_dstaddr((void *) arg);
default:
if ((cmd >= SIOCDEVPRIVATE) &&
(cmd <= (SIOCDEVPRIVATE + 15)))
return(dev_ioctl(cmd,(void *) arg));
if(sk->prot->ioctl==0 || (err=sk->prot->ioctl(sk, cmd, arg))==-ENOIOCTLCMD)
return(dev_ioctl(cmd,(void *) arg));
return err;
}
/*NOTREACHED*/
return(0);
}
struct proto_ops inet6_stream_ops = {
family: PF_INET6,
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: inet_setsockopt, /* ok */
getsockopt: inet_getsockopt, /* ok */
sendmsg: inet_sendmsg, /* ok */
recvmsg: inet_recvmsg, /* ok */
mmap: sock_no_mmap,
sendpage: tcp_sendpage
};
struct proto_ops inet6_dgram_ops = {
family: PF_INET6,
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: inet_setsockopt, /* ok */
getsockopt: inet_getsockopt, /* ok */
sendmsg: inet_sendmsg, /* ok */
recvmsg: inet_recvmsg, /* ok */
mmap: sock_no_mmap,
sendpage: sock_no_sendpage,
};
struct net_proto_family inet6_family_ops = {
PF_INET6,
inet6_create
};
#ifdef MODULE
int ipv6_unload(void)
{
if (!unloadable) return 1;
/* We keep internally 3 raw sockets */
return atomic_read(&(__this_module.uc.usecount)) - 3;
}
#endif
#if defined(MODULE) && defined(CONFIG_SYSCTL)
extern void ipv6_sysctl_register(void);
extern void ipv6_sysctl_unregister(void);
#endif
static struct inet_protosw rawv6_protosw = {
type: SOCK_RAW,
protocol: IPPROTO_IP, /* wild card */
prot: &rawv6_prot,
ops: &inet6_dgram_ops,
capability: CAP_NET_RAW,
no_check: UDP_CSUM_DEFAULT,
flags: INET_PROTOSW_REUSE,
};
#define INETSW6_ARRAY_LEN (sizeof(inetsw6_array) / sizeof(struct inet_protosw))
void
inet6_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, &inetsw6[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, &inetsw6[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
inet6_unregister_protosw(struct inet_protosw *p)
{
inet_unregister_protosw(p);
}
static int __init inet6_init(void)
{
struct sk_buff *dummy_skb;
struct list_head *r;
int err;
#ifdef MODULE
if (!mod_member_present(&__this_module, can_unload))
return -EINVAL;
__this_module.can_unload = &ipv6_unload;
#endif
printk(KERN_INFO "IPv6 v0.8 for NET4.0\n");
if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb))
{
printk(KERN_CRIT "inet6_proto_init: size fault\n");
return -EINVAL;
}
/* 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);
/*
* 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.
*/
#if defined(MODULE) && defined(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;
/* Create /proc/foo6 entries. */
#ifdef CONFIG_PROC_FS
err = -ENOMEM;
if (!proc_net_create("raw6", 0, raw6_get_info))
goto proc_raw6_fail;
if (!proc_net_create("tcp6", 0, tcp6_get_info))
goto proc_tcp6_fail;
if (!proc_net_create("udp6", 0, udp6_get_info))
goto proc_udp6_fail;
if (!proc_net_create("sockstat6", 0, afinet6_get_info))
goto proc_sockstat6_fail;
if (!proc_net_create("snmp6", 0, afinet6_get_snmp))
goto proc_snmp6_fail;
#endif
ipv6_netdev_notif_init();
ipv6_packet_init();
ip6_route_init();
ip6_flowlabel_init();
addrconf_init();
sit_init();
/* Init v6 transport protocols. */
udpv6_init();
tcpv6_init();
/* Now the userspace is allowed to create INET6 sockets. */
(void) sock_register(&inet6_family_ops);
return 0;
#ifdef CONFIG_PROC_FS
proc_snmp6_fail:
proc_net_remove("sockstat6");
proc_sockstat6_fail:
proc_net_remove("udp6");
proc_udp6_fail:
proc_net_remove("tcp6");
proc_tcp6_fail:
proc_net_remove("raw6");
proc_raw6_fail:
igmp6_cleanup();
#endif
igmp_fail:
ndisc_cleanup();
ndisc_fail:
icmpv6_cleanup();
icmp_fail:
#if defined(MODULE) && defined(CONFIG_SYSCTL)
ipv6_sysctl_unregister();
#endif
return err;
}
module_init(inet6_init);
#ifdef MODULE
static void inet6_exit(void)
{
/* First of all disallow new sockets creation. */
sock_unregister(PF_INET6);
#ifdef CONFIG_PROC_FS
proc_net_remove("raw6");
proc_net_remove("tcp6");
proc_net_remove("udp6");
proc_net_remove("sockstat6");
proc_net_remove("snmp6");
#endif
/* Cleanup code parts. */
sit_cleanup();
ipv6_netdev_notif_cleanup();
ip6_flowlabel_cleanup();
addrconf_cleanup();
ip6_route_cleanup();
ipv6_packet_cleanup();
igmp6_cleanup();
ndisc_cleanup();
icmpv6_cleanup();
#ifdef CONFIG_SYSCTL
ipv6_sysctl_unregister();
#endif
}
module_exit(inet6_exit);
#endif /* MODULE */
MODULE_LICENSE("GPL");
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