af_inet6.c 29.7 KB
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/*
 *	PF_INET6 socket protocol family
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 *	Linux INET6 implementation
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 *
 *	Authors:
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 *	Pedro Roque		<roque@di.fc.ul.pt>
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 *
 *	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>
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#include <linux/capability.h>
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#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>
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#include <linux/slab.h>
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#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/icmpv6.h>
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#include <linux/netfilter_ipv6.h>
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#include <net/ip.h>
#include <net/ipv6.h>
#include <net/udp.h>
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#include <net/udplite.h>
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#include <net/tcp.h>
#include <net/ipip.h>
#include <net/protocol.h>
#include <net/inet_common.h>
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#include <net/route.h>
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#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>
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#include <linux/mroute6.h>
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MODULE_AUTHOR("Cast of dozens");
MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
MODULE_LICENSE("GPL");

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/* The inetsw6 table contains everything that inet6_create needs to
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 * build a new socket.
 */
static struct list_head inetsw6[SOCK_MAX];
static DEFINE_SPINLOCK(inetsw6_lock);

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struct ipv6_params ipv6_defaults = {
	.disable_ipv6 = 0,
	.autoconf = 1,
};

static int disable_ipv6_mod = 0;

module_param_named(disable, disable_ipv6_mod, int, 0444);
MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");

module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");

module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
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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);
}

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static int inet6_create(struct net *net, struct socket *sock, int protocol,
			int kern)
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{
	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;
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	int try_loading_module = 0;
	int err;
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	if (sock->type != SOCK_RAW &&
	    sock->type != SOCK_DGRAM &&
	    !inet_ehash_secret)
		build_ehash_secret();

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	/* Look for the requested type/protocol pair. */
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lookup_protocol:
	err = -ESOCKTNOSUPPORT;
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	rcu_read_lock();
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	list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
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		err = 0;
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		/* 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;
		}
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		err = -EPROTONOSUPPORT;
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	}

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	if (err) {
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		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;
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	if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
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		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();

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	WARN_ON(answer_prot->slab == NULL);
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	err = -ENOBUFS;
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	sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot);
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	if (sk == NULL)
		goto out;

	sock_init_data(sock, sk);

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	err = 0;
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	sk->sk_no_check = answer_no_check;
	if (INET_PROTOSW_REUSE & answer_flags)
		sk->sk_reuse = 1;

	inet = inet_sk(sk);
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	inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
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	if (SOCK_RAW == sock->type) {
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		inet->inet_num = protocol;
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		if (IPPROTO_RAW == protocol)
			inet->hdrincl = 1;
	}

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	sk->sk_destruct		= inet_sock_destruct;
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	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;
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	np->mcast_hops	= IPV6_DEFAULT_MCASTHOPS;
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	np->mc_loop	= 1;
	np->pmtudisc	= IPV6_PMTUDISC_WANT;
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	np->ipv6only	= net->ipv6.sysctl.bindv6only;
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	/* 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;
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	inet->rcv_tos	= 0;
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	if (ipv4_config.no_pmtu_disc)
		inet->pmtudisc = IP_PMTUDISC_DONT;
	else
		inet->pmtudisc = IP_PMTUDISC_WANT;
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	/*
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	 * 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);
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	if (inet->inet_num) {
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		/* It assumes that any protocol which allows
		 * the user to assign a number at socket
		 * creation time automatically shares.
		 */
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		inet->inet_sport = htons(inet->inet_num);
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		sk->sk_prot->hash(sk);
	}
	if (sk->sk_prot->init) {
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		err = sk->sk_prot->init(sk);
		if (err) {
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			sk_common_release(sk);
			goto out;
		}
	}
out:
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	return err;
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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);
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	struct net *net = sock_net(sk);
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	__be32 v4addr = 0;
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	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;
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	if (addr->sin6_family != AF_INET6)
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		return -EAFNOSUPPORT;
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	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). */
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	if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
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		err = -EINVAL;
		goto out;
	}

	/* Check if the address belongs to the host. */
	if (addr_type == IPV6_ADDR_MAPPED) {
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		int chk_addr_ret;

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		/* Binding to v4-mapped address on a v6-only socket
		 * makes no sense
		 */
		if (np->ipv6only) {
			err = -EINVAL;
			goto out;
		}
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		/* Reproduce AF_INET checks to make the bindings consistent */
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		v4addr = addr->sin6_addr.s6_addr32[3];
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		chk_addr_ret = inet_addr_type(net, v4addr);
		if (!sysctl_ip_nonlocal_bind &&
		    !(inet->freebind || inet->transparent) &&
		    v4addr != htonl(INADDR_ANY) &&
		    chk_addr_ret != RTN_LOCAL &&
		    chk_addr_ret != RTN_MULTICAST &&
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		    chk_addr_ret != RTN_BROADCAST) {
			err = -EADDRNOTAVAIL;
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			goto out;
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		}
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	} else {
		if (addr_type != IPV6_ADDR_ANY) {
			struct net_device *dev = NULL;

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			rcu_read_lock();
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			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;
				}
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				/* Binding to link-local address requires an interface */
				if (!sk->sk_bound_dev_if) {
					err = -EINVAL;
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					goto out_unlock;
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				}
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				dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
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				if (!dev) {
					err = -ENODEV;
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					goto out_unlock;
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				}
			}

			/* 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))	{
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				if (!(inet->freebind || inet->transparent) &&
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				    !ipv6_chk_addr(net, &addr->sin6_addr,
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						   dev, 0)) {
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					err = -EADDRNOTAVAIL;
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					goto out_unlock;
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				}
			}
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			rcu_read_unlock();
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		}
	}

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	inet->inet_rcv_saddr = v4addr;
	inet->inet_saddr = v4addr;
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	np->rcv_saddr = addr->sin6_addr;
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	if (!(addr_type & IPV6_ADDR_MULTICAST))
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		np->saddr = addr->sin6_addr;
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	/* Make sure we are allowed to bind here. */
	if (sk->sk_prot->get_port(sk, snum)) {
		inet_reset_saddr(sk);
		err = -EADDRINUSE;
		goto out;
	}

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	if (addr_type != IPV6_ADDR_ANY) {
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		sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
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		if (addr_type != IPV6_ADDR_MAPPED)
			np->ipv6only = 1;
	}
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	if (snum)
		sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
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	inet->inet_sport = htons(inet->inet_num);
	inet->inet_dport = 0;
	inet->inet_daddr = 0;
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out:
	release_sock(sk);
	return err;
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out_unlock:
	rcu_read_unlock();
	goto out;
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}

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EXPORT_SYMBOL(inet6_bind);

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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);
}

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EXPORT_SYMBOL(inet6_release);

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void inet6_destroy_sock(struct sock *sk)
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{
	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);
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	if ((skb = xchg(&np->rxpmtu, NULL)) != NULL)
		kfree_skb(skb);
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	/* Free flowlabels */
	fl6_free_socklist(sk);

	/* Free tx options */

	if ((opt = xchg(&np->opt, NULL)) != NULL)
		sock_kfree_s(sk, opt, opt->tot_len);
}

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EXPORT_SYMBOL_GPL(inet6_destroy_sock);

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/*
 *	This does both peername and sockname.
 */
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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);
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	sin->sin6_family = AF_INET6;
	sin->sin6_flowinfo = 0;
	sin->sin6_scope_id = 0;
	if (peer) {
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		if (!inet->inet_dport)
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			return -ENOTCONN;
		if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
		    peer == 1)
			return -ENOTCONN;
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		sin->sin6_port = inet->inet_dport;
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		sin->sin6_addr = np->daddr;
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		if (np->sndflow)
			sin->sin6_flowinfo = np->flow_label;
	} else {
		if (ipv6_addr_any(&np->rcv_saddr))
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			sin->sin6_addr = np->saddr;
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		else
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			sin->sin6_addr = np->rcv_saddr;
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		sin->sin6_port = inet->inet_sport;
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	}
	if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
		sin->sin6_scope_id = sk->sk_bound_dev_if;
	*uaddr_len = sizeof(*sin);
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	return 0;
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}

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EXPORT_SYMBOL(inet6_getname);

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int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
	struct sock *sk = sock->sk;
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	struct net *net = sock_net(sk);
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	switch(cmd)
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	{
	case SIOCGSTAMP:
		return sock_get_timestamp(sk, (struct timeval __user *)arg);

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	case SIOCGSTAMPNS:
		return sock_get_timestampns(sk, (struct timespec __user *)arg);

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	case SIOCADDRT:
	case SIOCDELRT:
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		return ipv6_route_ioctl(net, cmd, (void __user *)arg);
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	case SIOCSIFADDR:
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		return addrconf_add_ifaddr(net, (void __user *) arg);
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	case SIOCDIFADDR:
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		return addrconf_del_ifaddr(net, (void __user *) arg);
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	case SIOCSIFDSTADDR:
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		return addrconf_set_dstaddr(net, (void __user *) arg);
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	default:
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		if (!sk->sk_prot->ioctl)
			return -ENOIOCTLCMD;
		return sk->sk_prot->ioctl(sk, cmd, arg);
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	}
	/*NOTREACHED*/
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	return 0;
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}

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EXPORT_SYMBOL(inet6_ioctl);

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const struct proto_ops inet6_stream_ops = {
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	.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		*/
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	.sendmsg	   = inet_sendmsg,		/* ok		*/
	.recvmsg	   = inet_recvmsg,		/* ok		*/
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	.mmap		   = sock_no_mmap,
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	.sendpage	   = inet_sendpage,
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	.splice_read	   = tcp_splice_read,
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#ifdef CONFIG_COMPAT
536 537
	.compat_setsockopt = compat_sock_common_setsockopt,
	.compat_getsockopt = compat_sock_common_getsockopt,
538
#endif
L
Linus Torvalds 已提交
539 540
};

541
const struct proto_ops inet6_dgram_ops = {
542 543 544 545 546 547 548 549 550 551 552 553 554 555 556
	.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		*/
557
	.recvmsg	   = inet_recvmsg,		/* ok		*/
558 559
	.mmap		   = sock_no_mmap,
	.sendpage	   = sock_no_sendpage,
560
#ifdef CONFIG_COMPAT
561 562
	.compat_setsockopt = compat_sock_common_setsockopt,
	.compat_getsockopt = compat_sock_common_getsockopt,
563
#endif
L
Linus Torvalds 已提交
564 565
};

566
static const struct net_proto_family inet6_family_ops = {
L
Linus Torvalds 已提交
567 568 569 570 571
	.family = PF_INET6,
	.create = inet6_create,
	.owner	= THIS_MODULE,
};

572
int inet6_register_protosw(struct inet_protosw *p)
L
Linus Torvalds 已提交
573 574 575 576
{
	struct list_head *lh;
	struct inet_protosw *answer;
	struct list_head *last_perm;
577 578
	int protocol = p->protocol;
	int ret;
L
Linus Torvalds 已提交
579 580 581

	spin_lock_bh(&inetsw6_lock);

582
	ret = -EINVAL;
L
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583 584 585 586 587
	if (p->type >= SOCK_MAX)
		goto out_illegal;

	/* If we are trying to override a permanent protocol, bail. */
	answer = NULL;
588
	ret = -EPERM;
L
Linus Torvalds 已提交
589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607
	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
608
	 * non-permanent entry.  This means that when we remove this entry, the
L
Linus Torvalds 已提交
609 610 611
	 * system automatically returns to the old behavior.
	 */
	list_add_rcu(&p->list, last_perm);
612
	ret = 0;
L
Linus Torvalds 已提交
613 614
out:
	spin_unlock_bh(&inetsw6_lock);
615
	return ret;
L
Linus Torvalds 已提交
616 617 618 619 620 621 622 623 624 625 626 627 628

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;
}

629 630
EXPORT_SYMBOL(inet6_register_protosw);

L
Linus Torvalds 已提交
631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646
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();
	}
}

647 648
EXPORT_SYMBOL(inet6_unregister_protosw);

649 650 651
int inet6_sk_rebuild_header(struct sock *sk)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
652
	struct dst_entry *dst;
653 654 655 656 657

	dst = __sk_dst_check(sk, np->dst_cookie);

	if (dst == NULL) {
		struct inet_sock *inet = inet_sk(sk);
658
		struct in6_addr *final_p, final;
659 660 661 662
		struct flowi6 fl6;

		memset(&fl6, 0, sizeof(fl6));
		fl6.flowi6_proto = sk->sk_protocol;
A
Alexey Dobriyan 已提交
663 664
		fl6.daddr = np->daddr;
		fl6.saddr = np->saddr;
665 666 667
		fl6.flowlabel = np->flow_label;
		fl6.flowi6_oif = sk->sk_bound_dev_if;
		fl6.flowi6_mark = sk->sk_mark;
668 669
		fl6.fl6_dport = inet->inet_dport;
		fl6.fl6_sport = inet->inet_sport;
670 671 672 673 674
		security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));

		final_p = fl6_update_dst(&fl6, np->opt, &final);

		dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
675
		if (IS_ERR(dst)) {
676
			sk->sk_route_caps = 0;
677 678
			sk->sk_err_soft = -PTR_ERR(dst);
			return PTR_ERR(dst);
679 680
		}

681
		__ip6_dst_store(sk, dst, NULL, NULL);
682 683 684 685 686 687 688
	}

	return 0;
}

EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);

689 690 691 692 693 694 695 696
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)) ||
697 698
		    ((IPV6_FLOWINFO_MASK &
		      *(__be32 *)skb_network_header(skb)) &&
699 700 701 702 703 704 705 706 707 708 709 710
		     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);

H
Herbert Xu 已提交
711
static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto)
712
{
713
	const struct inet6_protocol *ops = NULL;
714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741

	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);
	}

H
Herbert Xu 已提交
742
	return proto;
743 744 745 746
}

static int ipv6_gso_send_check(struct sk_buff *skb)
{
747
	const struct ipv6hdr *ipv6h;
748
	const struct inet6_protocol *ops;
749 750 751 752 753 754 755 756 757 758
	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();
H
Herbert Xu 已提交
759 760 761
	ops = rcu_dereference(inet6_protos[
		ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]);

762 763 764 765 766 767 768 769 770 771
	if (likely(ops && ops->gso_send_check)) {
		skb_reset_transport_header(skb);
		err = ops->gso_send_check(skb);
	}
	rcu_read_unlock();

out:
	return err;
}

772 773
static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
	netdev_features_t features)
774 775 776
{
	struct sk_buff *segs = ERR_PTR(-EINVAL);
	struct ipv6hdr *ipv6h;
777
	const struct inet6_protocol *ops;
778 779 780 781 782
	int proto;
	struct frag_hdr *fptr;
	unsigned int unfrag_ip6hlen;
	u8 *prevhdr;
	int offset = 0;
783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801

	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);

802
	proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
803
	rcu_read_lock();
804
	ops = rcu_dereference(inet6_protos[proto]);
805 806 807 808 809 810
	if (likely(ops && ops->gso_segment)) {
		skb_reset_transport_header(skb);
		segs = ops->gso_segment(skb, features);
	}
	rcu_read_unlock();

811
	if (IS_ERR(segs))
812 813 814 815 816 817
		goto out;

	for (skb = segs; skb; skb = skb->next) {
		ipv6h = ipv6_hdr(skb);
		ipv6h->payload_len = htons(skb->len - skb->mac_len -
					   sizeof(*ipv6h));
818 819 820 821 822 823 824 825 826 827
		if (proto == IPPROTO_UDP) {
			unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
			fptr = (struct frag_hdr *)(skb_network_header(skb) +
				unfrag_ip6hlen);
			fptr->frag_off = htons(offset);
			if (skb->next != NULL)
				fptr->frag_off |= htons(IP6_MF);
			offset += (ntohs(ipv6h->payload_len) -
				   sizeof(struct frag_hdr));
		}
828 829 830 831 832 833
	}

out:
	return segs;
}

H
Herbert Xu 已提交
834 835 836 837 838 839 840 841 842 843
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)
{
844
	const struct inet6_protocol *ops;
H
Herbert Xu 已提交
845 846 847 848
	struct sk_buff **pp = NULL;
	struct sk_buff *p;
	struct ipv6hdr *iph;
	unsigned int nlen;
849 850
	unsigned int hlen;
	unsigned int off;
H
Herbert Xu 已提交
851 852
	int flush = 1;
	int proto;
853
	__wsum csum;
H
Herbert Xu 已提交
854

855 856 857 858 859 860 861 862
	off = skb_gro_offset(skb);
	hlen = off + sizeof(*iph);
	iph = skb_gro_header_fast(skb, off);
	if (skb_gro_header_hard(skb, hlen)) {
		iph = skb_gro_header_slow(skb, hlen, off);
		if (unlikely(!iph))
			goto out;
	}
H
Herbert Xu 已提交
863

864 865
	skb_gro_pull(skb, sizeof(*iph));
	skb_set_transport_header(skb, skb_gro_offset(skb));
H
Herbert Xu 已提交
866

867
	flush += ntohs(iph->payload_len) != skb_gro_len(skb);
H
Herbert Xu 已提交
868 869

	rcu_read_lock();
870
	proto = iph->nexthdr;
H
Herbert Xu 已提交
871
	ops = rcu_dereference(inet6_protos[proto]);
872 873 874 875 876 877 878
	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));

879
		ops = rcu_dereference(inet6_protos[proto]);
880 881 882 883 884 885 886
		if (!ops || !ops->gro_receive)
			goto out_unlock;

		iph = ipv6_hdr(skb);
	}

	IPV6_GRO_CB(skb)->proto = proto;
H
Herbert Xu 已提交
887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912

	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;

913 914 915
	csum = skb->csum;
	skb_postpull_rcsum(skb, iph, skb_network_header_len(skb));

H
Herbert Xu 已提交
916 917
	pp = ops->gro_receive(head, skb);

918 919
	skb->csum = csum;

H
Herbert Xu 已提交
920 921 922 923 924 925 926 927 928 929 930
out_unlock:
	rcu_read_unlock();

out:
	NAPI_GRO_CB(skb)->flush |= flush;

	return pp;
}

static int ipv6_gro_complete(struct sk_buff *skb)
{
931
	const struct inet6_protocol *ops;
H
Herbert Xu 已提交
932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950
	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;
}

951
static struct packet_type ipv6_packet_type __read_mostly = {
952
	.type = cpu_to_be16(ETH_P_IPV6),
953 954 955
	.func = ipv6_rcv,
	.gso_send_check = ipv6_gso_send_check,
	.gso_segment = ipv6_gso_segment,
H
Herbert Xu 已提交
956 957
	.gro_receive = ipv6_gro_receive,
	.gro_complete = ipv6_gro_complete,
958 959 960 961 962 963 964 965 966 967 968 969 970
};

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);
}

971 972
static int __net_init ipv6_init_mibs(struct net *net)
{
973
	if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6,
974 975
			  sizeof(struct udp_mib),
			  __alignof__(struct udp_mib)) < 0)
976
		return -ENOMEM;
977
	if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6,
978 979
			  sizeof(struct udp_mib),
			  __alignof__(struct udp_mib)) < 0)
980
		goto err_udplite_mib;
981
	if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics,
982 983
			  sizeof(struct ipstats_mib),
			  __alignof__(struct ipstats_mib)) < 0)
984
		goto err_ip_mib;
985
	if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics,
986 987
			  sizeof(struct icmpv6_mib),
			  __alignof__(struct icmpv6_mib)) < 0)
988
		goto err_icmp_mib;
989 990 991
	net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
						GFP_KERNEL);
	if (!net->mib.icmpv6msg_statistics)
992
		goto err_icmpmsg_mib;
993
	return 0;
994

995
err_icmpmsg_mib:
996
	snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
997
err_icmp_mib:
998
	snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
999
err_ip_mib:
1000
	snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
1001
err_udplite_mib:
1002
	snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
1003
	return -ENOMEM;
1004 1005
}

1006
static void ipv6_cleanup_mibs(struct net *net)
1007
{
1008 1009 1010 1011
	snmp_mib_free((void __percpu **)net->mib.udp_stats_in6);
	snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6);
	snmp_mib_free((void __percpu **)net->mib.ipv6_statistics);
	snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics);
1012
	kfree(net->mib.icmpv6msg_statistics);
1013 1014
}

A
Alexey Dobriyan 已提交
1015
static int __net_init inet6_net_init(struct net *net)
1016
{
1017 1018
	int err = 0;

1019
	net->ipv6.sysctl.bindv6only = 0;
1020
	net->ipv6.sysctl.icmpv6_time = 1*HZ;
1021

1022 1023 1024
	err = ipv6_init_mibs(net);
	if (err)
		return err;
1025 1026 1027 1028
#ifdef CONFIG_PROC_FS
	err = udp6_proc_init(net);
	if (err)
		goto out;
1029 1030 1031
	err = tcp6_proc_init(net);
	if (err)
		goto proc_tcp6_fail;
1032 1033 1034
	err = ac6_proc_init(net);
	if (err)
		goto proc_ac6_fail;
1035 1036
#endif
	return err;
1037 1038

#ifdef CONFIG_PROC_FS
1039 1040
proc_ac6_fail:
	tcp6_proc_exit(net);
1041 1042
proc_tcp6_fail:
	udp6_proc_exit(net);
1043 1044 1045
out:
	ipv6_cleanup_mibs(net);
	return err;
1046
#endif
1047 1048
}

1049
static void __net_exit inet6_net_exit(struct net *net)
1050
{
1051 1052
#ifdef CONFIG_PROC_FS
	udp6_proc_exit(net);
1053
	tcp6_proc_exit(net);
1054
	ac6_proc_exit(net);
1055
#endif
1056
	ipv6_cleanup_mibs(net);
1057 1058 1059 1060 1061 1062 1063
}

static struct pernet_operations inet6_net_ops = {
	.init = inet6_net_init,
	.exit = inet6_net_exit,
};

L
Linus Torvalds 已提交
1064 1065 1066
static int __init inet6_init(void)
{
	struct sk_buff *dummy_skb;
1067
	struct list_head *r;
1068
	int err = 0;
L
Linus Torvalds 已提交
1069

1070 1071
	BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb));

1072 1073 1074 1075
	/* Register the socket-side information for inet6_create.  */
	for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
		INIT_LIST_HEAD(r);

1076
	if (disable_ipv6_mod) {
1077 1078 1079 1080 1081 1082
		printk(KERN_INFO
		       "IPv6: Loaded, but administratively disabled, "
		       "reboot required to enable\n");
		goto out;
	}

L
Linus Torvalds 已提交
1083 1084 1085 1086 1087 1088 1089 1090
	err = proto_register(&tcpv6_prot, 1);
	if (err)
		goto out;

	err = proto_register(&udpv6_prot, 1);
	if (err)
		goto out_unregister_tcp_proto;

1091
	err = proto_register(&udplitev6_prot, 1);
L
Linus Torvalds 已提交
1092 1093 1094
	if (err)
		goto out_unregister_udp_proto;

1095 1096 1097 1098
	err = proto_register(&rawv6_prot, 1);
	if (err)
		goto out_unregister_udplite_proto;

L
Linus Torvalds 已提交
1099 1100 1101 1102

	/* We MUST register RAW sockets before we create the ICMP6,
	 * IGMP6, or NDISC control sockets.
	 */
1103 1104 1105
	err = rawv6_init();
	if (err)
		goto out_unregister_raw_proto;
L
Linus Torvalds 已提交
1106 1107 1108 1109

	/* Register the family here so that the init calls below will
	 * be able to create sockets. (?? is this dangerous ??)
	 */
1110 1111
	err = sock_register(&inet6_family_ops);
	if (err)
1112
		goto out_sock_register_fail;
L
Linus Torvalds 已提交
1113

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Glauber Costa 已提交
1114 1115
	tcpv6_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem;

L
Linus Torvalds 已提交
1116 1117 1118
	/*
	 *	ipngwg API draft makes clear that the correct semantics
	 *	for TCP and UDP is to consider one TCP and UDP instance
L
Lucas De Marchi 已提交
1119
	 *	in a host available by both INET and INET6 APIs and
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	 *	able to communicate via both network protocols.
	 */

1123 1124 1125
	err = register_pernet_subsys(&inet6_net_ops);
	if (err)
		goto register_pernet_fail;
1126
	err = icmpv6_init();
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Linus Torvalds 已提交
1127 1128
	if (err)
		goto icmp_fail;
W
Wang Chen 已提交
1129 1130 1131
	err = ip6_mr_init();
	if (err)
		goto ipmr_fail;
1132
	err = ndisc_init();
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Linus Torvalds 已提交
1133 1134
	if (err)
		goto ndisc_fail;
1135
	err = igmp6_init();
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Linus Torvalds 已提交
1136 1137
	if (err)
		goto igmp_fail;
1138 1139 1140
	err = ipv6_netfilter_init();
	if (err)
		goto netfilter_fail;
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Linus Torvalds 已提交
1141 1142 1143 1144 1145
	/* Create /proc/foo6 entries. */
#ifdef CONFIG_PROC_FS
	err = -ENOMEM;
	if (raw6_proc_init())
		goto proc_raw6_fail;
1146 1147
	if (udplite6_proc_init())
		goto proc_udplite6_fail;
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Linus Torvalds 已提交
1148 1149 1150 1151 1152
	if (ipv6_misc_proc_init())
		goto proc_misc6_fail;
	if (if6_proc_init())
		goto proc_if6_fail;
#endif
1153 1154 1155
	err = ip6_route_init();
	if (err)
		goto ip6_route_fail;
1156 1157 1158
	err = ip6_flowlabel_init();
	if (err)
		goto ip6_flowlabel_fail;
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Linus Torvalds 已提交
1159 1160 1161 1162 1163
	err = addrconf_init();
	if (err)
		goto addrconf_fail;

	/* Init v6 extension headers. */
1164 1165 1166 1167
	err = ipv6_exthdrs_init();
	if (err)
		goto ipv6_exthdrs_fail;

1168 1169 1170
	err = ipv6_frag_init();
	if (err)
		goto ipv6_frag_fail;
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Linus Torvalds 已提交
1171 1172

	/* Init v6 transport protocols. */
1173 1174 1175
	err = udpv6_init();
	if (err)
		goto udpv6_fail;
1176

1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187
	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;
1188 1189 1190 1191 1192 1193

#ifdef CONFIG_SYSCTL
	err = ipv6_sysctl_register();
	if (err)
		goto sysctl_fail;
#endif
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1194 1195 1196
out:
	return err;

1197 1198 1199 1200
#ifdef CONFIG_SYSCTL
sysctl_fail:
	ipv6_packet_cleanup();
#endif
1201 1202 1203 1204 1205 1206 1207 1208
ipv6_packet_fail:
	tcpv6_exit();
tcpv6_fail:
	udplitev6_exit();
udplitev6_fail:
	udpv6_exit();
udpv6_fail:
	ipv6_frag_exit();
1209 1210
ipv6_frag_fail:
	ipv6_exthdrs_exit();
1211 1212
ipv6_exthdrs_fail:
	addrconf_cleanup();
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Linus Torvalds 已提交
1213 1214
addrconf_fail:
	ip6_flowlabel_cleanup();
1215
ip6_flowlabel_fail:
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Linus Torvalds 已提交
1216
	ip6_route_cleanup();
1217
ip6_route_fail:
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Linus Torvalds 已提交
1218 1219 1220 1221 1222
#ifdef CONFIG_PROC_FS
	if6_proc_exit();
proc_if6_fail:
	ipv6_misc_proc_exit();
proc_misc6_fail:
1223 1224
	udplite6_proc_exit();
proc_udplite6_fail:
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Linus Torvalds 已提交
1225 1226 1227
	raw6_proc_exit();
proc_raw6_fail:
#endif
1228 1229
	ipv6_netfilter_fini();
netfilter_fail:
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Linus Torvalds 已提交
1230 1231 1232 1233
	igmp6_cleanup();
igmp_fail:
	ndisc_cleanup();
ndisc_fail:
W
Wang Chen 已提交
1234 1235
	ip6_mr_cleanup();
ipmr_fail:
L
Linus Torvalds 已提交
1236 1237
	icmpv6_cleanup();
icmp_fail:
1238 1239
	unregister_pernet_subsys(&inet6_net_ops);
register_pernet_fail:
1240
	sock_unregister(PF_INET6);
1241
	rtnl_unregister_all(PF_INET6);
1242 1243
out_sock_register_fail:
	rawv6_exit();
L
Linus Torvalds 已提交
1244 1245
out_unregister_raw_proto:
	proto_unregister(&rawv6_prot);
1246 1247
out_unregister_udplite_proto:
	proto_unregister(&udplitev6_prot);
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Linus Torvalds 已提交
1248 1249 1250 1251 1252 1253 1254 1255 1256 1257
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)
{
1258
	if (disable_ipv6_mod)
1259 1260
		return;

L
Linus Torvalds 已提交
1261 1262
	/* First of all disallow new sockets creation. */
	sock_unregister(PF_INET6);
1263 1264
	/* Disallow any further netlink messages */
	rtnl_unregister_all(PF_INET6);
1265

1266 1267 1268 1269
	udpv6_exit();
	udplitev6_exit();
	tcpv6_exit();

1270 1271
	/* Cleanup code parts. */
	ipv6_packet_cleanup();
1272
	ipv6_frag_exit();
1273
	ipv6_exthdrs_exit();
1274 1275 1276
	addrconf_cleanup();
	ip6_flowlabel_cleanup();
	ip6_route_cleanup();
L
Linus Torvalds 已提交
1277
#ifdef CONFIG_PROC_FS
1278 1279

	/* Cleanup code parts. */
L
Linus Torvalds 已提交
1280
	if6_proc_exit();
1281 1282 1283
	ipv6_misc_proc_exit();
	udplite6_proc_exit();
	raw6_proc_exit();
1284
#endif
1285
	ipv6_netfilter_fini();
1286
	igmp6_cleanup();
L
Linus Torvalds 已提交
1287
	ndisc_cleanup();
W
Wang Chen 已提交
1288
	ip6_mr_cleanup();
L
Linus Torvalds 已提交
1289
	icmpv6_cleanup();
1290
	rawv6_exit();
1291

1292
	unregister_pernet_subsys(&inet6_net_ops);
L
Linus Torvalds 已提交
1293
	proto_unregister(&rawv6_prot);
1294
	proto_unregister(&udplitev6_prot);
L
Linus Torvalds 已提交
1295 1296
	proto_unregister(&udpv6_prot);
	proto_unregister(&tcpv6_prot);
1297 1298

	rcu_barrier(); /* Wait for completion of call_rcu()'s */
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Linus Torvalds 已提交
1299 1300 1301 1302
}
module_exit(inet6_exit);

MODULE_ALIAS_NETPROTO(PF_INET6);