Exemple #1
0
int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, int len,
		  int noblock, int flags, int *addr_len)
{
	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name;
	struct sk_buff *skb;
	int copied, err;

	if (flags & MSG_OOB)
		return -EOPNOTSUPP;
		
	if (addr_len) 
		*addr_len=sizeof(*sin6);

	if (flags & MSG_ERRQUEUE)
		return ipv6_recv_error(sk, msg, len);

	skb = skb_recv_datagram(sk, flags, noblock, &err);
	if (!skb)
		goto out;

	copied = skb->tail - skb->h.raw;
  	if (copied > len) {
  		copied = len;
  		msg->msg_flags |= MSG_TRUNC;
  	}

	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
	sk->stamp=skb->stamp;
	if (err)
		goto out_free;

	/* Copy the address. */
	if (sin6) {
		sin6->sin6_family = AF_INET6;
		memcpy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr, 
		       sizeof(struct in6_addr));
		sin6->sin6_flowinfo = 0;
		sin6->sin6_scope_id = 0;
		if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
			sin6->sin6_scope_id = 
				((struct inet6_skb_parm *) skb->cb)->iif;
	}

	if (sk->net_pinfo.af_inet6.rxopt.all)
		datagram_recv_ctl(sk, msg, skb);
	err = copied;

out_free:
	skb_free_datagram(sk, skb);
out:
	return err;
}
Exemple #2
0
int ipv6_getsockopt(struct sock *sk, int level, int optname,
		    char __user *optval, int __user *optlen)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	int len;
	int val;

	if (level == SOL_IP && sk->sk_type != SOCK_RAW)
		return udp_prot.getsockopt(sk, level, optname, optval, optlen);
	if(level!=SOL_IPV6)
		return -ENOPROTOOPT;
	if (get_user(len, optlen))
		return -EFAULT;
	switch (optname) {
	case IPV6_ADDRFORM:
		if (sk->sk_protocol != IPPROTO_UDP &&
		    sk->sk_protocol != IPPROTO_TCP)
			return -EINVAL;
		if (sk->sk_state != TCP_ESTABLISHED)
			return -ENOTCONN;
		val = sk->sk_family;
		break;
	case MCAST_MSFILTER:
	{
		struct group_filter gsf;
		int err;

		if (len < GROUP_FILTER_SIZE(0))
			return -EINVAL;
		if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
			return -EFAULT;
		lock_sock(sk);
		err = ip6_mc_msfget(sk, &gsf,
			(struct group_filter __user *)optval, optlen);
		release_sock(sk);
		return err;
	}

	case IPV6_PKTOPTIONS:
	{
		struct msghdr msg;
		struct sk_buff *skb;

		if (sk->sk_type != SOCK_STREAM)
			return -ENOPROTOOPT;

		msg.msg_control = optval;
		msg.msg_controllen = len;
		msg.msg_flags = 0;

		lock_sock(sk);
		skb = np->pktoptions;
		if (skb)
			atomic_inc(&skb->users);
		release_sock(sk);

		if (skb) {
			int err = datagram_recv_ctl(sk, &msg, skb);
			kfree_skb(skb);
			if (err)
				return err;
		} else {
			if (np->rxopt.bits.rxinfo) {
				struct in6_pktinfo src_info;
				src_info.ipi6_ifindex = np->mcast_oif;
				ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
				put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
			}
			if (np->rxopt.bits.rxhlim) {
				int hlim = np->mcast_hops;
				put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
			}
		}
		len -= msg.msg_controllen;
		return put_user(len, optlen);
	}
	case IPV6_MTU:
	{
		struct dst_entry *dst;
		val = 0;	
		lock_sock(sk);
		dst = sk_dst_get(sk);
		if (dst) {
			val = dst_mtu(dst);
			dst_release(dst);
		}
		release_sock(sk);
		if (!val)
			return -ENOTCONN;
		break;
	}

	case IPV6_V6ONLY:
		val = np->ipv6only;
		break;

	case IPV6_PKTINFO:
		val = np->rxopt.bits.rxinfo;
		break;

	case IPV6_HOPLIMIT:
		val = np->rxopt.bits.rxhlim;
		break;

	case IPV6_RTHDR:
		val = np->rxopt.bits.srcrt;
		break;

	case IPV6_HOPOPTS:
		val = np->rxopt.bits.hopopts;
		break;

	case IPV6_DSTOPTS:
		val = np->rxopt.bits.dstopts;
		break;

	case IPV6_FLOWINFO:
		val = np->rxopt.bits.rxflow;
		break;

	case IPV6_UNICAST_HOPS:
		val = np->hop_limit;
		break;

	case IPV6_MULTICAST_HOPS:
		val = np->mcast_hops;
		break;

	case IPV6_MULTICAST_LOOP:
		val = np->mc_loop;
		break;

	case IPV6_MULTICAST_IF:
		val = np->mcast_oif;
		break;

	case IPV6_MTU_DISCOVER:
		val = np->pmtudisc;
		break;

	case IPV6_RECVERR:
		val = np->recverr;
		break;

	case IPV6_FLOWINFO_SEND:
		val = np->sndflow;
		break;

	default:
#ifdef CONFIG_NETFILTER
		lock_sock(sk);
		val = nf_getsockopt(sk, PF_INET6, optname, optval, 
				    &len);
		release_sock(sk);
		if (val >= 0)
			val = put_user(len, optlen);
		return val;
#else
		return -EINVAL;
#endif
	}
	len = min_t(unsigned int, sizeof(int), len);
	if(put_user(len, optlen))
		return -EFAULT;
	if(copy_to_user(optval,&val,len))
		return -EFAULT;
	return 0;
}
static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
		    char __user *optval, int __user *optlen, unsigned int flags)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	int len;
	int val;

	if (ip6_mroute_opt(optname))
		return ip6_mroute_getsockopt(sk, optname, optval, optlen);

	if (get_user(len, optlen))
		return -EFAULT;
	switch (optname) {
	case IPV6_ADDRFORM:
		if (sk->sk_protocol != IPPROTO_UDP &&
		    sk->sk_protocol != IPPROTO_UDPLITE &&
		    sk->sk_protocol != IPPROTO_TCP)
			return -ENOPROTOOPT;
		if (sk->sk_state != TCP_ESTABLISHED)
			return -ENOTCONN;
		val = sk->sk_family;
		break;
	case MCAST_MSFILTER:
	{
		struct group_filter gsf;
		int err;

		if (len < GROUP_FILTER_SIZE(0))
			return -EINVAL;
		if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
			return -EFAULT;
		if (gsf.gf_group.ss_family != AF_INET6)
			return -EADDRNOTAVAIL;
		lock_sock(sk);
		err = ip6_mc_msfget(sk, &gsf,
			(struct group_filter __user *)optval, optlen);
		release_sock(sk);
		return err;
	}

	case IPV6_2292PKTOPTIONS:
	{
		struct msghdr msg;
		struct sk_buff *skb;

		if (sk->sk_type != SOCK_STREAM)
			return -ENOPROTOOPT;

		msg.msg_control = optval;
		msg.msg_controllen = len;
		msg.msg_flags = flags;

		lock_sock(sk);
		skb = np->pktoptions;
		if (skb)
			atomic_inc(&skb->users);
		release_sock(sk);

		if (skb) {
			int err = datagram_recv_ctl(sk, &msg, skb);
			kfree_skb(skb);
			if (err)
				return err;
		} else {
			if (np->rxopt.bits.rxinfo) {
				struct in6_pktinfo src_info;
				src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
					np->sticky_pktinfo.ipi6_ifindex;
				src_info.ipi6_addr = np->mcast_oif ? np->daddr : np->sticky_pktinfo.ipi6_addr;
				put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
			}
			if (np->rxopt.bits.rxhlim) {
				int hlim = np->mcast_hops;
				put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
			}
			if (np->rxopt.bits.rxtclass) {
				int tclass = np->rcv_tclass;
				put_cmsg(&msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
			}
			if (np->rxopt.bits.rxoinfo) {
				struct in6_pktinfo src_info;
				src_info.ipi6_ifindex = np->mcast_oif ? np->mcast_oif :
					np->sticky_pktinfo.ipi6_ifindex;
				src_info.ipi6_addr = np->mcast_oif ? np->daddr : np->sticky_pktinfo.ipi6_addr;
				put_cmsg(&msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
			}
			if (np->rxopt.bits.rxohlim) {
				int hlim = np->mcast_hops;
				put_cmsg(&msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
			}
		}
		len -= msg.msg_controllen;
		return put_user(len, optlen);
	}
	case IPV6_MTU:
	{
		struct dst_entry *dst;

		val = 0;
		rcu_read_lock();
		dst = __sk_dst_get(sk);
		if (dst)
			val = dst_mtu(dst);
		rcu_read_unlock();
		if (!val)
			return -ENOTCONN;
		break;
	}

	case IPV6_V6ONLY:
		val = np->ipv6only;
		break;

	case IPV6_RECVPKTINFO:
		val = np->rxopt.bits.rxinfo;
		break;

	case IPV6_2292PKTINFO:
		val = np->rxopt.bits.rxoinfo;
		break;

	case IPV6_RECVHOPLIMIT:
		val = np->rxopt.bits.rxhlim;
		break;

	case IPV6_2292HOPLIMIT:
		val = np->rxopt.bits.rxohlim;
		break;

	case IPV6_RECVRTHDR:
		val = np->rxopt.bits.srcrt;
		break;

	case IPV6_2292RTHDR:
		val = np->rxopt.bits.osrcrt;
		break;

	case IPV6_HOPOPTS:
	case IPV6_RTHDRDSTOPTS:
	case IPV6_RTHDR:
	case IPV6_DSTOPTS:
	{

		lock_sock(sk);
		len = ipv6_getsockopt_sticky(sk, np->opt,
					     optname, optval, len);
		release_sock(sk);
		/* check if ipv6_getsockopt_sticky() returns err code */
		if (len < 0)
			return len;
		return put_user(len, optlen);
	}

	case IPV6_RECVHOPOPTS:
		val = np->rxopt.bits.hopopts;
		break;

	case IPV6_2292HOPOPTS:
		val = np->rxopt.bits.ohopopts;
		break;

	case IPV6_RECVDSTOPTS:
		val = np->rxopt.bits.dstopts;
		break;

	case IPV6_2292DSTOPTS:
		val = np->rxopt.bits.odstopts;
		break;

	case IPV6_TCLASS:
		val = np->tclass;
		break;

	case IPV6_RECVTCLASS:
		val = np->rxopt.bits.rxtclass;
		break;

	case IPV6_FLOWINFO:
		val = np->rxopt.bits.rxflow;
		break;

	case IPV6_RECVPATHMTU:
		val = np->rxopt.bits.rxpmtu;
		break;

	case IPV6_PATHMTU:
	{
		struct dst_entry *dst;
		struct ip6_mtuinfo mtuinfo;

		if (len < sizeof(mtuinfo))
			return -EINVAL;

		len = sizeof(mtuinfo);
		memset(&mtuinfo, 0, sizeof(mtuinfo));

		rcu_read_lock();
		dst = __sk_dst_get(sk);
		if (dst)
			mtuinfo.ip6m_mtu = dst_mtu(dst);
		rcu_read_unlock();
		if (!mtuinfo.ip6m_mtu)
			return -ENOTCONN;

		if (put_user(len, optlen))
			return -EFAULT;
		if (copy_to_user(optval, &mtuinfo, len))
			return -EFAULT;

		return 0;
		break;
	}

	case IPV6_TRANSPARENT:
		val = inet_sk(sk)->transparent;
		break;

	case IPV6_RECVORIGDSTADDR:
		val = np->rxopt.bits.rxorigdstaddr;
		break;

	case IPV6_UNICAST_HOPS:
	case IPV6_MULTICAST_HOPS:
	{
		struct dst_entry *dst;

		if (optname == IPV6_UNICAST_HOPS)
			val = np->hop_limit;
		else
			val = np->mcast_hops;

		if (val < 0) {
			rcu_read_lock();
			dst = __sk_dst_get(sk);
			if (dst)
				val = ip6_dst_hoplimit(dst);
			rcu_read_unlock();
		}

		if (val < 0)
			val = sock_net(sk)->ipv6.devconf_all->hop_limit;
		break;
	}

	case IPV6_MULTICAST_LOOP:
		val = np->mc_loop;
		break;

	case IPV6_MULTICAST_IF:
		val = np->mcast_oif;
		break;

	case IPV6_UNICAST_IF:
		val = (__force int)htonl((__u32) np->ucast_oif);
		break;

	case IPV6_MTU_DISCOVER:
		val = np->pmtudisc;
		break;

	case IPV6_RECVERR:
		val = np->recverr;
		break;

	case IPV6_FLOWINFO_SEND:
		val = np->sndflow;
		break;

	case IPV6_ADDR_PREFERENCES:
		val = 0;

		if (np->srcprefs & IPV6_PREFER_SRC_TMP)
			val |= IPV6_PREFER_SRC_TMP;
		else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC)
			val |= IPV6_PREFER_SRC_PUBLIC;
		else {
			/* XXX: should we return system default? */
			val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT;
		}

		if (np->srcprefs & IPV6_PREFER_SRC_COA)
			val |= IPV6_PREFER_SRC_COA;
		else
			val |= IPV6_PREFER_SRC_HOME;
		break;

	case IPV6_MINHOPCOUNT:
		val = np->min_hopcount;
		break;

	case IPV6_DONTFRAG:
		val = np->dontfrag;
		break;

	default:
		return -ENOPROTOOPT;
	}
	len = min_t(unsigned int, sizeof(int), len);
	if(put_user(len, optlen))
		return -EFAULT;
	if(copy_to_user(optval,&val,len))
		return -EFAULT;
	return 0;
}
Exemple #4
0
int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, int len,
                  int noblock, int flags, int *addr_len)
{
    struct sk_buff *skb;
    int copied, err;

    if (addr_len)
        *addr_len=sizeof(struct sockaddr_in6);

    if (flags & MSG_ERRQUEUE)
        return ipv6_recv_error(sk, msg, len);

    skb = skb_recv_datagram(sk, flags, noblock, &err);
    if (!skb)
        goto out;

    copied = skb->len - sizeof(struct udphdr);
    if (copied > len) {
        copied = len;
        msg->msg_flags |= MSG_TRUNC;
    }

    if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
        err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
                                      copied);
    } else if (msg->msg_flags&MSG_TRUNC) {
        if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
            goto csum_copy_err;
        err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
                                      copied);
    } else {
        err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
        if (err == -EINVAL)
            goto csum_copy_err;
    }
    if (err)
        goto out_free;

    sock_recv_timestamp(msg, sk, skb);

    /* Copy the address. */
    if (msg->msg_name) {
        struct sockaddr_in6 *sin6;

        sin6 = (struct sockaddr_in6 *) msg->msg_name;
        sin6->sin6_family = AF_INET6;
        sin6->sin6_port = skb->h.uh->source;
        sin6->sin6_flowinfo = 0;
        sin6->sin6_scope_id = 0;

        if (skb->protocol == __constant_htons(ETH_P_IP)) {
            ipv6_addr_set(&sin6->sin6_addr, 0, 0,
                          __constant_htonl(0xffff), skb->nh.iph->saddr);
            if (sk->protinfo.af_inet.cmsg_flags)
                ip_cmsg_recv(msg, skb);
        } else {
            memcpy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr,
                   sizeof(struct in6_addr));

            if (sk->net_pinfo.af_inet6.rxopt.all)
                datagram_recv_ctl(sk, msg, skb);
            if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
                struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
                sin6->sin6_scope_id = opt->iif;
            }
        }
    }
    err = copied;

out_free:
    skb_free_datagram(sk, skb);
out:
    return err;

csum_copy_err:
    /* Clear queue. */
    if (flags&MSG_PEEK) {
        int clear = 0;
        spin_lock_irq(&sk->receive_queue.lock);
        if (skb == skb_peek(&sk->receive_queue)) {
            __skb_unlink(skb, &sk->receive_queue);
            clear = 1;
        }
        spin_unlock_irq(&sk->receive_queue.lock);
        if (clear)
            kfree_skb(skb);
    }

    /* Error for blocking case is chosen to masquerade
       as some normal condition.
     */
    err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
    UDP6_INC_STATS_USER(UdpInErrors);
    goto out_free;
}
/*
 *	Handle MSG_ERRQUEUE
 */
int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct sock_exterr_skb *serr;
	struct sk_buff *skb, *skb2;
	struct sockaddr_in6 *sin;
	struct {
		struct sock_extended_err ee;
		struct sockaddr_in6	 offender;
	} errhdr;
	int err;
	int copied;

	err = -EAGAIN;
	skb = skb_dequeue(&sk->sk_error_queue);
	if (skb == NULL)
		goto out;

	copied = skb->len;
	if (copied > len) {
		msg->msg_flags |= MSG_TRUNC;
		copied = len;
	}
	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
	if (err)
		goto out_free_skb;

	sock_recv_timestamp(msg, sk, skb);

	serr = SKB_EXT_ERR(skb);

	sin = (struct sockaddr_in6 *)msg->msg_name;
	if (sin) {
		const unsigned char *nh = skb_network_header(skb);
		sin->sin6_family = AF_INET6;
		sin->sin6_flowinfo = 0;
		sin->sin6_port = serr->port;
		sin->sin6_scope_id = 0;
		if (skb->protocol == htons(ETH_P_IPV6)) {
			ipv6_addr_copy(&sin->sin6_addr,
				  (struct in6_addr *)(nh + serr->addr_offset));
			if (np->sndflow)
				sin->sin6_flowinfo =
					(*(__be32 *)(nh + serr->addr_offset - 24) &
					 IPV6_FLOWINFO_MASK);
			if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
				sin->sin6_scope_id = IP6CB(skb)->iif;
		} else {
			ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
					       &sin->sin6_addr);
		}
	}

	memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
	sin = &errhdr.offender;
	sin->sin6_family = AF_UNSPEC;
	if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
		sin->sin6_family = AF_INET6;
		sin->sin6_flowinfo = 0;
		sin->sin6_scope_id = 0;
		if (skb->protocol == htons(ETH_P_IPV6)) {
			ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr);
			if (np->rxopt.all)
				datagram_recv_ctl(sk, msg, skb);
			if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
				sin->sin6_scope_id = IP6CB(skb)->iif;
		} else {
			struct inet_sock *inet = inet_sk(sk);

			ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
					       &sin->sin6_addr);
			if (inet->cmsg_flags)
				ip_cmsg_recv(msg, skb);
		}
	}

	put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);

	/* Now we could try to dump offended packet options */

	msg->msg_flags |= MSG_ERRQUEUE;
	err = copied;

	/* Reset and regenerate socket error */
	spin_lock_bh(&sk->sk_error_queue.lock);
	sk->sk_err = 0;
	if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
		sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
		spin_unlock_bh(&sk->sk_error_queue.lock);
		sk->sk_error_report(sk);
	} else {
		spin_unlock_bh(&sk->sk_error_queue.lock);
	}

out_free_skb:
	kfree_skb(skb);
out:
	return err;
}
Exemple #6
0
int ipv6_getsockopt(struct sock *sk, int level, int optname, char *optval, 
		    int *optlen)
{
	struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
	int len;
	int val;

	if(level==SOL_IP && sk->type != SOCK_RAW)
		return udp_prot.getsockopt(sk, level, optname, optval, optlen);
	if(level!=SOL_IPV6)
		return -ENOPROTOOPT;
	if (get_user(len, optlen))
		return -EFAULT;
	if (optlen < 0)
		return -EINVAL;
	switch (optname) {
	case IPV6_PKTOPTIONS:
	{
		struct msghdr msg;
		struct sk_buff *skb;

		if (sk->type != SOCK_STREAM)
			return -ENOPROTOOPT;

		msg.msg_control = optval;
		msg.msg_controllen = len;
		msg.msg_flags = 0;

		lock_sock(sk);
		skb = np->pktoptions;
		if (skb)
			atomic_inc(&skb->users);
		release_sock(sk);

		if (skb) {
			int err = datagram_recv_ctl(sk, &msg, skb);
			kfree_skb(skb);
			if (err)
				return err;
		} else {
			if (np->rxopt.bits.rxinfo) {
				struct in6_pktinfo src_info;
				src_info.ipi6_ifindex = np->mcast_oif;
				ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
				put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
			}
			if (np->rxopt.bits.rxhlim) {
				int hlim = np->mcast_hops;
				put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
			}
		}
		len -= msg.msg_controllen;
		return put_user(len, optlen);
	}

	case IPV6_MTU:
	{
		struct dst_entry *dst;
		val = 0;	
		lock_sock(sk);
		dst = sk_dst_get(sk);
		if (dst) {
			val = dst->pmtu;
			dst_release(dst);
		}
		release_sock(sk);
		if (!val)
			return -ENOTCONN;
		break;
	}

	case IPV6_PKTINFO:
		val = np->rxopt.bits.rxinfo;
		break;

	case IPV6_HOPLIMIT:
		val = np->rxopt.bits.rxhlim;
		break;

	case IPV6_RTHDR:
		val = np->rxopt.bits.srcrt;
		break;

	case IPV6_HOPOPTS:
		val = np->rxopt.bits.hopopts;
		break;

	case IPV6_AUTHHDR:
		val = np->rxopt.bits.authhdr;
		break;

	case IPV6_DSTOPTS:
		val = np->rxopt.bits.dstopts;
		break;

	case IPV6_FLOWINFO:
		val = np->rxopt.bits.rxflow;
		break;

	case IPV6_UNICAST_HOPS:
		val = np->hop_limit;
		break;

	case IPV6_MULTICAST_HOPS:
		val = np->mcast_hops;
		break;

	case IPV6_MULTICAST_LOOP:
		val = np->mc_loop;
		break;

	case IPV6_MULTICAST_IF:
		val = np->mcast_oif;
		break;

	case IPV6_MTU_DISCOVER:
		val = np->pmtudisc;
		break;

	case IPV6_RECVERR:
		val = np->recverr;
		break;

	case IPV6_FLOWINFO_SEND:
		val = np->sndflow;
		break;

	case IPV6_JOIN_GROUP:
	case IPV6_LEAVE_GROUP:
		return -EOPNOTSUPP;

	case IPV6_V6ONLY:
		val = np->ipv6only;
		break;

	case IPV6_RECVTCLASS:
                val = np->recvopt.tclass;
                break;

	case IPV6_TCLASS:
		val = np->tclass;
                break;

	default:
#ifdef CONFIG_NETFILTER
		lock_sock(sk);
		val = nf_getsockopt(sk, PF_INET6, optname, optval, 
				    &len);
		release_sock(sk);
		if (val >= 0)
			val = put_user(len, optlen);
		return val;
#else
		return -EINVAL;
#endif
	}
	len = min_t(unsigned int, sizeof(int), len);
	if(put_user(len, optlen))
		return -EFAULT;
	if(copy_to_user(optval,&val,len))
		return -EFAULT;
	return 0;
}