mirror of https://gitee.com/openkylin/linux.git
1240 lines
28 KiB
C
1240 lines
28 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
|
|
*
|
|
* 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/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/netfilter_ipv6.h>
|
|
|
|
#include <net/ip.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/udp.h>
|
|
#include <net/udplite.h>
|
|
#include <net/tcp.h>
|
|
#include <net/ipip.h>
|
|
#include <net/protocol.h>
|
|
#include <net/inet_common.h>
|
|
#include <net/route.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>
|
|
#include <linux/mroute6.h>
|
|
|
|
MODULE_AUTHOR("Cast of dozens");
|
|
MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
/* The inetsw6 table contains everything that inet6_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 net *net, struct socket *sock, int protocol)
|
|
{
|
|
struct inet_sock *inet;
|
|
struct ipv6_pinfo *np;
|
|
struct sock *sk;
|
|
struct inet_protosw *answer;
|
|
struct proto *answer_prot;
|
|
unsigned char answer_flags;
|
|
char answer_no_check;
|
|
int try_loading_module = 0;
|
|
int err;
|
|
|
|
if (sock->type != SOCK_RAW &&
|
|
sock->type != SOCK_DGRAM &&
|
|
!inet_ehash_secret)
|
|
build_ehash_secret();
|
|
|
|
/* Look for the requested type/protocol pair. */
|
|
lookup_protocol:
|
|
err = -ESOCKTNOSUPPORT;
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
|
|
|
|
err = 0;
|
|
/* 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;
|
|
}
|
|
|
|
if (err) {
|
|
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();
|
|
|
|
WARN_ON(answer_prot->slab == NULL);
|
|
|
|
err = -ENOBUFS;
|
|
sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
|
|
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) != 0;
|
|
|
|
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 = net->ipv6.sysctl.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 = htons(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);
|
|
struct net *net = sock_net(sk);
|
|
__be32 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(net, 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(net, 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(net, &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 = htons(inet->num);
|
|
inet->dport = 0;
|
|
inet->daddr = 0;
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
EXPORT_SYMBOL(inet6_bind);
|
|
|
|
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);
|
|
}
|
|
|
|
EXPORT_SYMBOL(inet6_release);
|
|
|
|
void 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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
EXPORT_SYMBOL(inet6_getname);
|
|
|
|
int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct net *net = sock_net(sk);
|
|
|
|
switch(cmd)
|
|
{
|
|
case SIOCGSTAMP:
|
|
return sock_get_timestamp(sk, (struct timeval __user *)arg);
|
|
|
|
case SIOCGSTAMPNS:
|
|
return sock_get_timestampns(sk, (struct timespec __user *)arg);
|
|
|
|
case SIOCADDRT:
|
|
case SIOCDELRT:
|
|
|
|
return(ipv6_route_ioctl(net, cmd, (void __user *)arg));
|
|
|
|
case SIOCSIFADDR:
|
|
return addrconf_add_ifaddr(net, (void __user *) arg);
|
|
case SIOCDIFADDR:
|
|
return addrconf_del_ifaddr(net, (void __user *) arg);
|
|
case SIOCSIFDSTADDR:
|
|
return addrconf_set_dstaddr(net, (void __user *) arg);
|
|
default:
|
|
if (!sk->sk_prot->ioctl)
|
|
return -ENOIOCTLCMD;
|
|
return sk->sk_prot->ioctl(sk, cmd, arg);
|
|
}
|
|
/*NOTREACHED*/
|
|
return(0);
|
|
}
|
|
|
|
EXPORT_SYMBOL(inet6_ioctl);
|
|
|
|
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 = tcp_sendmsg, /* ok */
|
|
.recvmsg = sock_common_recvmsg, /* ok */
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = tcp_sendpage,
|
|
.splice_read = tcp_splice_read,
|
|
#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,
|
|
};
|
|
|
|
int inet6_register_protosw(struct inet_protosw *p)
|
|
{
|
|
struct list_head *lh;
|
|
struct inet_protosw *answer;
|
|
struct list_head *last_perm;
|
|
int protocol = p->protocol;
|
|
int ret;
|
|
|
|
spin_lock_bh(&inetsw6_lock);
|
|
|
|
ret = -EINVAL;
|
|
if (p->type >= SOCK_MAX)
|
|
goto out_illegal;
|
|
|
|
/* If we are trying to override a permanent protocol, bail. */
|
|
answer = NULL;
|
|
ret = -EPERM;
|
|
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);
|
|
ret = 0;
|
|
out:
|
|
spin_unlock_bh(&inetsw6_lock);
|
|
return ret;
|
|
|
|
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;
|
|
}
|
|
|
|
EXPORT_SYMBOL(inet6_register_protosw);
|
|
|
|
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();
|
|
}
|
|
}
|
|
|
|
EXPORT_SYMBOL(inet6_unregister_protosw);
|
|
|
|
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;
|
|
security_sk_classify_flow(sk, &fl);
|
|
|
|
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(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
|
|
sk->sk_err_soft = -err;
|
|
return err;
|
|
}
|
|
|
|
__ip6_dst_store(sk, dst, NULL, 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 &
|
|
*(__be32 *)skb_network_header(skb)) &&
|
|
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);
|
|
|
|
static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
|
|
{
|
|
struct inet6_protocol *ops = NULL;
|
|
|
|
for (;;) {
|
|
struct ipv6_opt_hdr *opth;
|
|
int len;
|
|
|
|
if (proto != NEXTHDR_HOP) {
|
|
ops = rcu_dereference(inet6_protos[proto]);
|
|
|
|
if (unlikely(!ops))
|
|
break;
|
|
|
|
if (!(ops->flags & INET6_PROTO_GSO_EXTHDR))
|
|
break;
|
|
}
|
|
|
|
if (unlikely(!pskb_may_pull(skb, 8)))
|
|
break;
|
|
|
|
opth = (void *)skb->data;
|
|
len = ipv6_optlen(opth);
|
|
|
|
if (unlikely(!pskb_may_pull(skb, len)))
|
|
break;
|
|
|
|
proto = opth->nexthdr;
|
|
__skb_pull(skb, len);
|
|
}
|
|
|
|
return proto;
|
|
}
|
|
|
|
static int ipv6_gso_send_check(struct sk_buff *skb)
|
|
{
|
|
struct ipv6hdr *ipv6h;
|
|
struct inet6_protocol *ops;
|
|
int err = -EINVAL;
|
|
|
|
if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
|
|
goto out;
|
|
|
|
ipv6h = ipv6_hdr(skb);
|
|
__skb_pull(skb, sizeof(*ipv6h));
|
|
err = -EPROTONOSUPPORT;
|
|
|
|
rcu_read_lock();
|
|
ops = rcu_dereference(inet6_protos[
|
|
ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
|
|
|
|
if (likely(ops && ops->gso_send_check)) {
|
|
skb_reset_transport_header(skb);
|
|
err = ops->gso_send_check(skb);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
|
|
{
|
|
struct sk_buff *segs = ERR_PTR(-EINVAL);
|
|
struct ipv6hdr *ipv6h;
|
|
struct inet6_protocol *ops;
|
|
|
|
if (!(features & NETIF_F_V6_CSUM))
|
|
features &= ~NETIF_F_SG;
|
|
|
|
if (unlikely(skb_shinfo(skb)->gso_type &
|
|
~(SKB_GSO_UDP |
|
|
SKB_GSO_DODGY |
|
|
SKB_GSO_TCP_ECN |
|
|
SKB_GSO_TCPV6 |
|
|
0)))
|
|
goto out;
|
|
|
|
if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h))))
|
|
goto out;
|
|
|
|
ipv6h = ipv6_hdr(skb);
|
|
__skb_pull(skb, sizeof(*ipv6h));
|
|
segs = ERR_PTR(-EPROTONOSUPPORT);
|
|
|
|
rcu_read_lock();
|
|
ops = rcu_dereference(inet6_protos[
|
|
ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);
|
|
|
|
if (likely(ops && ops->gso_segment)) {
|
|
skb_reset_transport_header(skb);
|
|
segs = ops->gso_segment(skb, features);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (unlikely(IS_ERR(segs)))
|
|
goto out;
|
|
|
|
for (skb = segs; skb; skb = skb->next) {
|
|
ipv6h = ipv6_hdr(skb);
|
|
ipv6h->payload_len = htons(skb->len - skb->mac_len -
|
|
sizeof(*ipv6h));
|
|
}
|
|
|
|
out:
|
|
return segs;
|
|
}
|
|
|
|
struct ipv6_gro_cb {
|
|
struct napi_gro_cb napi;
|
|
int proto;
|
|
};
|
|
|
|
#define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb)
|
|
|
|
static struct sk_buff **ipv6_gro_receive(struct sk_buff **head,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct inet6_protocol *ops;
|
|
struct sk_buff **pp = NULL;
|
|
struct sk_buff *p;
|
|
struct ipv6hdr *iph;
|
|
unsigned int nlen;
|
|
int flush = 1;
|
|
int proto;
|
|
__wsum csum;
|
|
|
|
iph = skb_gro_header(skb, sizeof(*iph));
|
|
if (unlikely(!iph))
|
|
goto out;
|
|
|
|
skb_gro_pull(skb, sizeof(*iph));
|
|
skb_set_transport_header(skb, skb_gro_offset(skb));
|
|
|
|
flush += ntohs(iph->payload_len) != skb_gro_len(skb);
|
|
|
|
rcu_read_lock();
|
|
proto = iph->nexthdr;
|
|
ops = rcu_dereference(inet6_protos[proto]);
|
|
if (!ops || !ops->gro_receive) {
|
|
__pskb_pull(skb, skb_gro_offset(skb));
|
|
proto = ipv6_gso_pull_exthdrs(skb, proto);
|
|
skb_gro_pull(skb, -skb_transport_offset(skb));
|
|
skb_reset_transport_header(skb);
|
|
__skb_push(skb, skb_gro_offset(skb));
|
|
|
|
if (!ops || !ops->gro_receive)
|
|
goto out_unlock;
|
|
|
|
iph = ipv6_hdr(skb);
|
|
}
|
|
|
|
IPV6_GRO_CB(skb)->proto = proto;
|
|
|
|
flush--;
|
|
nlen = skb_network_header_len(skb);
|
|
|
|
for (p = *head; p; p = p->next) {
|
|
struct ipv6hdr *iph2;
|
|
|
|
if (!NAPI_GRO_CB(p)->same_flow)
|
|
continue;
|
|
|
|
iph2 = ipv6_hdr(p);
|
|
|
|
/* All fields must match except length. */
|
|
if (nlen != skb_network_header_len(p) ||
|
|
memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) ||
|
|
memcmp(&iph->nexthdr, &iph2->nexthdr,
|
|
nlen - offsetof(struct ipv6hdr, nexthdr))) {
|
|
NAPI_GRO_CB(p)->same_flow = 0;
|
|
continue;
|
|
}
|
|
|
|
NAPI_GRO_CB(p)->flush |= flush;
|
|
}
|
|
|
|
NAPI_GRO_CB(skb)->flush |= flush;
|
|
|
|
csum = skb->csum;
|
|
skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));
|
|
|
|
pp = ops->gro_receive(head, skb);
|
|
|
|
skb->csum = csum;
|
|
|
|
out_unlock:
|
|
rcu_read_unlock();
|
|
|
|
out:
|
|
NAPI_GRO_CB(skb)->flush |= flush;
|
|
|
|
return pp;
|
|
}
|
|
|
|
static int ipv6_gro_complete(struct sk_buff *skb)
|
|
{
|
|
struct inet6_protocol *ops;
|
|
struct ipv6hdr *iph = ipv6_hdr(skb);
|
|
int err = -ENOSYS;
|
|
|
|
iph->payload_len = htons(skb->len - skb_network_offset(skb) -
|
|
sizeof(*iph));
|
|
|
|
rcu_read_lock();
|
|
ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]);
|
|
if (WARN_ON(!ops || !ops->gro_complete))
|
|
goto out_unlock;
|
|
|
|
err = ops->gro_complete(skb);
|
|
|
|
out_unlock:
|
|
rcu_read_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
static struct packet_type ipv6_packet_type = {
|
|
.type = cpu_to_be16(ETH_P_IPV6),
|
|
.func = ipv6_rcv,
|
|
.gso_send_check = ipv6_gso_send_check,
|
|
.gso_segment = ipv6_gso_segment,
|
|
.gro_receive = ipv6_gro_receive,
|
|
.gro_complete = ipv6_gro_complete,
|
|
};
|
|
|
|
static int __init ipv6_packet_init(void)
|
|
{
|
|
dev_add_pack(&ipv6_packet_type);
|
|
return 0;
|
|
}
|
|
|
|
static void ipv6_packet_cleanup(void)
|
|
{
|
|
dev_remove_pack(&ipv6_packet_type);
|
|
}
|
|
|
|
static int __net_init ipv6_init_mibs(struct net *net)
|
|
{
|
|
if (snmp_mib_init((void **)net->mib.udp_stats_in6,
|
|
sizeof (struct udp_mib)) < 0)
|
|
return -ENOMEM;
|
|
if (snmp_mib_init((void **)net->mib.udplite_stats_in6,
|
|
sizeof (struct udp_mib)) < 0)
|
|
goto err_udplite_mib;
|
|
if (snmp_mib_init((void **)net->mib.ipv6_statistics,
|
|
sizeof(struct ipstats_mib)) < 0)
|
|
goto err_ip_mib;
|
|
if (snmp_mib_init((void **)net->mib.icmpv6_statistics,
|
|
sizeof(struct icmpv6_mib)) < 0)
|
|
goto err_icmp_mib;
|
|
if (snmp_mib_init((void **)net->mib.icmpv6msg_statistics,
|
|
sizeof(struct icmpv6msg_mib)) < 0)
|
|
goto err_icmpmsg_mib;
|
|
return 0;
|
|
|
|
err_icmpmsg_mib:
|
|
snmp_mib_free((void **)net->mib.icmpv6_statistics);
|
|
err_icmp_mib:
|
|
snmp_mib_free((void **)net->mib.ipv6_statistics);
|
|
err_ip_mib:
|
|
snmp_mib_free((void **)net->mib.udplite_stats_in6);
|
|
err_udplite_mib:
|
|
snmp_mib_free((void **)net->mib.udp_stats_in6);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void __net_exit ipv6_cleanup_mibs(struct net *net)
|
|
{
|
|
snmp_mib_free((void **)net->mib.udp_stats_in6);
|
|
snmp_mib_free((void **)net->mib.udplite_stats_in6);
|
|
snmp_mib_free((void **)net->mib.ipv6_statistics);
|
|
snmp_mib_free((void **)net->mib.icmpv6_statistics);
|
|
snmp_mib_free((void **)net->mib.icmpv6msg_statistics);
|
|
}
|
|
|
|
static int __net_init inet6_net_init(struct net *net)
|
|
{
|
|
int err = 0;
|
|
|
|
net->ipv6.sysctl.bindv6only = 0;
|
|
net->ipv6.sysctl.icmpv6_time = 1*HZ;
|
|
|
|
err = ipv6_init_mibs(net);
|
|
if (err)
|
|
return err;
|
|
#ifdef CONFIG_PROC_FS
|
|
err = udp6_proc_init(net);
|
|
if (err)
|
|
goto out;
|
|
err = tcp6_proc_init(net);
|
|
if (err)
|
|
goto proc_tcp6_fail;
|
|
err = ac6_proc_init(net);
|
|
if (err)
|
|
goto proc_ac6_fail;
|
|
#endif
|
|
return err;
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
proc_ac6_fail:
|
|
tcp6_proc_exit(net);
|
|
proc_tcp6_fail:
|
|
udp6_proc_exit(net);
|
|
out:
|
|
ipv6_cleanup_mibs(net);
|
|
return err;
|
|
#endif
|
|
}
|
|
|
|
static void inet6_net_exit(struct net *net)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
udp6_proc_exit(net);
|
|
tcp6_proc_exit(net);
|
|
ac6_proc_exit(net);
|
|
#endif
|
|
ipv6_cleanup_mibs(net);
|
|
}
|
|
|
|
static struct pernet_operations inet6_net_ops = {
|
|
.init = inet6_net_init,
|
|
.exit = inet6_net_exit,
|
|
};
|
|
|
|
static int __init inet6_init(void)
|
|
{
|
|
struct sk_buff *dummy_skb;
|
|
struct list_head *r;
|
|
int err;
|
|
|
|
BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));
|
|
|
|
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(&udplitev6_prot, 1);
|
|
if (err)
|
|
goto out_unregister_udp_proto;
|
|
|
|
err = proto_register(&rawv6_prot, 1);
|
|
if (err)
|
|
goto out_unregister_udplite_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.
|
|
*/
|
|
err = rawv6_init();
|
|
if (err)
|
|
goto out_unregister_raw_proto;
|
|
|
|
/* 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_sock_register_fail;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
err = ipv6_static_sysctl_register();
|
|
if (err)
|
|
goto static_sysctl_fail;
|
|
#endif
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
err = register_pernet_subsys(&inet6_net_ops);
|
|
if (err)
|
|
goto register_pernet_fail;
|
|
err = icmpv6_init();
|
|
if (err)
|
|
goto icmp_fail;
|
|
err = ip6_mr_init();
|
|
if (err)
|
|
goto ipmr_fail;
|
|
err = ndisc_init();
|
|
if (err)
|
|
goto ndisc_fail;
|
|
err = igmp6_init();
|
|
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 (udplite6_proc_init())
|
|
goto proc_udplite6_fail;
|
|
if (ipv6_misc_proc_init())
|
|
goto proc_misc6_fail;
|
|
if (if6_proc_init())
|
|
goto proc_if6_fail;
|
|
#endif
|
|
err = ip6_route_init();
|
|
if (err)
|
|
goto ip6_route_fail;
|
|
err = ip6_flowlabel_init();
|
|
if (err)
|
|
goto ip6_flowlabel_fail;
|
|
err = addrconf_init();
|
|
if (err)
|
|
goto addrconf_fail;
|
|
|
|
/* Init v6 extension headers. */
|
|
err = ipv6_exthdrs_init();
|
|
if (err)
|
|
goto ipv6_exthdrs_fail;
|
|
|
|
err = ipv6_frag_init();
|
|
if (err)
|
|
goto ipv6_frag_fail;
|
|
|
|
/* Init v6 transport protocols. */
|
|
err = udpv6_init();
|
|
if (err)
|
|
goto udpv6_fail;
|
|
|
|
err = udplitev6_init();
|
|
if (err)
|
|
goto udplitev6_fail;
|
|
|
|
err = tcpv6_init();
|
|
if (err)
|
|
goto tcpv6_fail;
|
|
|
|
err = ipv6_packet_init();
|
|
if (err)
|
|
goto ipv6_packet_fail;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
err = ipv6_sysctl_register();
|
|
if (err)
|
|
goto sysctl_fail;
|
|
#endif
|
|
out:
|
|
return err;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
sysctl_fail:
|
|
ipv6_packet_cleanup();
|
|
#endif
|
|
ipv6_packet_fail:
|
|
tcpv6_exit();
|
|
tcpv6_fail:
|
|
udplitev6_exit();
|
|
udplitev6_fail:
|
|
udpv6_exit();
|
|
udpv6_fail:
|
|
ipv6_frag_exit();
|
|
ipv6_frag_fail:
|
|
ipv6_exthdrs_exit();
|
|
ipv6_exthdrs_fail:
|
|
addrconf_cleanup();
|
|
addrconf_fail:
|
|
ip6_flowlabel_cleanup();
|
|
ip6_flowlabel_fail:
|
|
ip6_route_cleanup();
|
|
ip6_route_fail:
|
|
#ifdef CONFIG_PROC_FS
|
|
if6_proc_exit();
|
|
proc_if6_fail:
|
|
ipv6_misc_proc_exit();
|
|
proc_misc6_fail:
|
|
udplite6_proc_exit();
|
|
proc_udplite6_fail:
|
|
raw6_proc_exit();
|
|
proc_raw6_fail:
|
|
#endif
|
|
ipv6_netfilter_fini();
|
|
netfilter_fail:
|
|
igmp6_cleanup();
|
|
igmp_fail:
|
|
ndisc_cleanup();
|
|
ndisc_fail:
|
|
ip6_mr_cleanup();
|
|
ipmr_fail:
|
|
icmpv6_cleanup();
|
|
icmp_fail:
|
|
unregister_pernet_subsys(&inet6_net_ops);
|
|
register_pernet_fail:
|
|
#ifdef CONFIG_SYSCTL
|
|
ipv6_static_sysctl_unregister();
|
|
static_sysctl_fail:
|
|
#endif
|
|
sock_unregister(PF_INET6);
|
|
rtnl_unregister_all(PF_INET6);
|
|
out_sock_register_fail:
|
|
rawv6_exit();
|
|
out_unregister_raw_proto:
|
|
proto_unregister(&rawv6_prot);
|
|
out_unregister_udplite_proto:
|
|
proto_unregister(&udplitev6_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);
|
|
/* Disallow any further netlink messages */
|
|
rtnl_unregister_all(PF_INET6);
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
ipv6_sysctl_unregister();
|
|
#endif
|
|
udpv6_exit();
|
|
udplitev6_exit();
|
|
tcpv6_exit();
|
|
|
|
/* Cleanup code parts. */
|
|
ipv6_packet_cleanup();
|
|
ipv6_frag_exit();
|
|
ipv6_exthdrs_exit();
|
|
addrconf_cleanup();
|
|
ip6_flowlabel_cleanup();
|
|
ip6_route_cleanup();
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
/* Cleanup code parts. */
|
|
if6_proc_exit();
|
|
ipv6_misc_proc_exit();
|
|
udplite6_proc_exit();
|
|
raw6_proc_exit();
|
|
#endif
|
|
ipv6_netfilter_fini();
|
|
igmp6_cleanup();
|
|
ndisc_cleanup();
|
|
ip6_mr_cleanup();
|
|
icmpv6_cleanup();
|
|
rawv6_exit();
|
|
|
|
unregister_pernet_subsys(&inet6_net_ops);
|
|
#ifdef CONFIG_SYSCTL
|
|
ipv6_static_sysctl_unregister();
|
|
#endif
|
|
proto_unregister(&rawv6_prot);
|
|
proto_unregister(&udplitev6_prot);
|
|
proto_unregister(&udpv6_prot);
|
|
proto_unregister(&tcpv6_prot);
|
|
}
|
|
module_exit(inet6_exit);
|
|
|
|
MODULE_ALIAS_NETPROTO(PF_INET6);
|