Commit message: [DCCP] getsockopt: Fix DCCP_SOCKOPT_[SEND,RECV]_CSCOV

We were only checking if there was enough space to put the int, but
left len as specified by the (malicious) user, sigh, fix it by setting
len to sizeof(val) and transfering just one int worth of data, the one
asked for.

Also check for negative len values.

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
CVE: CVE-2007-1730
CWE: NVD-CWE-Other
Vulnerability description: Integer signedness error in the DCCP support in the do_dccp_getsockopt function in net/dccp/proto.c in Linux kernel 2.6.20 and later allows local users to read kernel memory or cause a denial of service (oops) via a negative optlen value.

Project: linux-2.6

int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized)
{
	struct dccp_sock *dp = dccp_sk(sk);
	struct dccp_minisock *dmsk = dccp_msk(sk);
	struct inet_connection_sock *icsk = inet_csk(sk);

	dccp_minisock_init(&dp->dccps_minisock);
	do_gettimeofday(&dp->dccps_epoch);

	/*
	 * FIXME: We're hardcoding the CCID, and doing this at this point makes
	 * the listening (master) sock get CCID control blocks, which is not
	 * necessary, but for now, to not mess with the test userspace apps,
	 * lets leave it here, later the real solution is to do this in a
	 * setsockopt(CCIDs-I-want/accept). -acme
	 */
	if (likely(ctl_sock_initialized)) {
		int rc = dccp_feat_init(dmsk);

		if (rc)
			return rc;

		if (dmsk->dccpms_send_ack_vector) {
			dp->dccps_hc_rx_ackvec = dccp_ackvec_alloc(GFP_KERNEL);
			if (dp->dccps_hc_rx_ackvec == NULL)
				return -ENOMEM;
		}
		dp->dccps_hc_rx_ccid = ccid_hc_rx_new(dmsk->dccpms_rx_ccid,
						      sk, GFP_KERNEL);
		dp->dccps_hc_tx_ccid = ccid_hc_tx_new(dmsk->dccpms_tx_ccid,
						      sk, GFP_KERNEL);
		if (unlikely(dp->dccps_hc_rx_ccid == NULL ||
			     dp->dccps_hc_tx_ccid == NULL)) {
			ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk);
			ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk);
			if (dmsk->dccpms_send_ack_vector) {
				dccp_ackvec_free(dp->dccps_hc_rx_ackvec);
				dp->dccps_hc_rx_ackvec = NULL;
			}
			dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL;
			return -ENOMEM;
		}
	} else {
		/* control socket doesn't need feat nego */
		INIT_LIST_HEAD(&dmsk->dccpms_pending);
		INIT_LIST_HEAD(&dmsk->dccpms_conf);
	}

	dccp_init_xmit_timers(sk);
	icsk->icsk_rto		= DCCP_TIMEOUT_INIT;
	icsk->icsk_syn_retries	= sysctl_dccp_request_retries;
	sk->sk_state		= DCCP_CLOSED;
	sk->sk_write_space	= dccp_write_space;
	icsk->icsk_sync_mss	= dccp_sync_mss;
	dp->dccps_mss_cache	= 536;
	dp->dccps_role		= DCCP_ROLE_UNDEFINED;
	dp->dccps_service	= DCCP_SERVICE_CODE_IS_ABSENT;
	dp->dccps_l_ack_ratio	= dp->dccps_r_ack_ratio = 1;

	return 0;
}

Project: linux-2.6

void dccp_set_state(struct sock *sk, const int state)
{
	const int oldstate = sk->sk_state;

	dccp_pr_debug("%s(%p) %-10.10s -> %s\n",
		      dccp_role(sk), sk,
		      dccp_state_name(oldstate), dccp_state_name(state));
	WARN_ON(state == oldstate);

	switch (state) {
	case DCCP_OPEN:
		if (oldstate != DCCP_OPEN)
			DCCP_INC_STATS(DCCP_MIB_CURRESTAB);
		break;

	case DCCP_CLOSED:
		if (oldstate == DCCP_CLOSING || oldstate == DCCP_OPEN)
			DCCP_INC_STATS(DCCP_MIB_ESTABRESETS);

		sk->sk_prot->unhash(sk);
		if (inet_csk(sk)->icsk_bind_hash != NULL &&
		    !(sk->sk_userlocks & SOCK_BINDPORT_LOCK))
			inet_put_port(&dccp_hashinfo, sk);
		/* fall through */
	default:
		if (oldstate == DCCP_OPEN)
			DCCP_DEC_STATS(DCCP_MIB_CURRESTAB);
	}

	/* Change state AFTER socket is unhashed to avoid closed
	 * socket sitting in hash tables.
	 */
	sk->sk_state = state;
}

Project: linux-2.6

const char *dccp_state_name(const int state)
{
	static char *dccp_state_names[] = {
	[DCCP_OPEN]	  = "OPEN",
	[DCCP_REQUESTING] = "REQUESTING",
	[DCCP_PARTOPEN]	  = "PARTOPEN",
	[DCCP_LISTEN]	  = "LISTEN",
	[DCCP_RESPOND]	  = "RESPOND",
	[DCCP_CLOSING]	  = "CLOSING",
	[DCCP_TIME_WAIT]  = "TIME_WAIT",
	[DCCP_CLOSED]	  = "CLOSED",
	};

	if (state >= DCCP_MAX_STATES)
		return "INVALID STATE!";
	else
		return dccp_state_names[state];
}

Project: linux-2.6

int dccp_destroy_sock(struct sock *sk)
{
	struct dccp_sock *dp = dccp_sk(sk);
	struct dccp_minisock *dmsk = dccp_msk(sk);

	/*
	 * DCCP doesn't use sk_write_queue, just sk_send_head
	 * for retransmissions
	 */
	if (sk->sk_send_head != NULL) {
		kfree_skb(sk->sk_send_head);
		sk->sk_send_head = NULL;
	}

	/* Clean up a referenced DCCP bind bucket. */
	if (inet_csk(sk)->icsk_bind_hash != NULL)
		inet_put_port(&dccp_hashinfo, sk);

	kfree(dp->dccps_service_list);
	dp->dccps_service_list = NULL;

	if (dmsk->dccpms_send_ack_vector) {
		dccp_ackvec_free(dp->dccps_hc_rx_ackvec);
		dp->dccps_hc_rx_ackvec = NULL;
	}
	ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk);
	ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk);
	dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL;

	/* clean up feature negotiation state */
	dccp_feat_clean(dmsk);

	return 0;
}

Project: linux-2.6

int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
		 size_t len)
{
	const struct dccp_sock *dp = dccp_sk(sk);
	const int flags = msg->msg_flags;
	const int noblock = flags & MSG_DONTWAIT;
	struct sk_buff *skb;
	int rc, size;
	long timeo;

	if (len > dp->dccps_mss_cache)
		return -EMSGSIZE;

	lock_sock(sk);

	if (sysctl_dccp_tx_qlen &&
	    (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) {
		rc = -EAGAIN;
		goto out_release;
	}

	timeo = sock_sndtimeo(sk, noblock);

	/*
	 * We have to use sk_stream_wait_connect here to set sk_write_pending,
	 * so that the trick in dccp_rcv_request_sent_state_process.
	 */
	/* Wait for a connection to finish. */
	if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN | DCCPF_CLOSING))
		if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0)
			goto out_release;

	size = sk->sk_prot->max_header + len;
	release_sock(sk);
	skb = sock_alloc_send_skb(sk, size, noblock, &rc);
	lock_sock(sk);
	if (skb == NULL)
		goto out_release;

	skb_reserve(skb, sk->sk_prot->max_header);
	rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
	if (rc != 0)
		goto out_discard;

	skb_queue_tail(&sk->sk_write_queue, skb);
	dccp_write_xmit(sk,0);
out_release:
	release_sock(sk);
	return rc ? : len;
out_discard:
	kfree_skb(skb);
	goto out_release;
}

Project: linux-2.6

int dccp_setsockopt(struct sock *sk, int level, int optname,
		    char __user *optval, int optlen)
{
	if (level != SOL_DCCP)
		return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level,
							     optname, optval,
							     optlen);
	return do_dccp_setsockopt(sk, level, optname, optval, optlen);
}

Project: linux-2.6

static void dccp_mib_exit(void)
{
	free_percpu(dccp_statistics[0]);
	free_percpu(dccp_statistics[1]);
	dccp_statistics[0] = dccp_statistics[1] = NULL;
}

Project: linux-2.6

void dccp_hash(struct sock *sk)
{
	inet_hash(&dccp_hashinfo, sk);
}

Project: linux-2.6

int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg)
{
	dccp_pr_debug("entry\n");
	return -ENOIOCTLCMD;
}

Project: linux-2.6

static int dccp_close_state(struct sock *sk)
{
	const int next = dccp_new_state[sk->sk_state];
	const int ns = next & DCCP_STATE_MASK;

	if (ns != sk->sk_state)
		dccp_set_state(sk, ns);

	return next & DCCP_ACTION_FIN;
}

Project: linux-2.6

const char *dccp_packet_name(const int type)
{
	static const char *dccp_packet_names[] = {
		[DCCP_PKT_REQUEST]  = "REQUEST",
		[DCCP_PKT_RESPONSE] = "RESPONSE",
		[DCCP_PKT_DATA]	    = "DATA",
		[DCCP_PKT_ACK]	    = "ACK",
		[DCCP_PKT_DATAACK]  = "DATAACK",
		[DCCP_PKT_CLOSEREQ] = "CLOSEREQ",
		[DCCP_PKT_CLOSE]    = "CLOSE",
		[DCCP_PKT_RESET]    = "RESET",
		[DCCP_PKT_SYNC]	    = "SYNC",
		[DCCP_PKT_SYNCACK]  = "SYNCACK",
	};

	if (type >= DCCP_NR_PKT_TYPES)
		return "INVALID";
	else
		return dccp_packet_names[type];
}

Project: linux-2.6

int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
		 size_t len, int nonblock, int flags, int *addr_len)
{
	const struct dccp_hdr *dh;
	long timeo;

	lock_sock(sk);

	if (sk->sk_state == DCCP_LISTEN) {
		len = -ENOTCONN;
		goto out;
	}

	timeo = sock_rcvtimeo(sk, nonblock);

	do {
		struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);

		if (skb == NULL)
			goto verify_sock_status;

		dh = dccp_hdr(skb);

		if (dh->dccph_type == DCCP_PKT_DATA ||
		    dh->dccph_type == DCCP_PKT_DATAACK)
			goto found_ok_skb;

		if (dh->dccph_type == DCCP_PKT_RESET ||
		    dh->dccph_type == DCCP_PKT_CLOSE) {
			dccp_pr_debug("found fin ok!\n");
			len = 0;
			goto found_fin_ok;
		}
		dccp_pr_debug("packet_type=%s\n",
			      dccp_packet_name(dh->dccph_type));
		sk_eat_skb(sk, skb, 0);
verify_sock_status:
		if (sock_flag(sk, SOCK_DONE)) {
			len = 0;
			break;
		}

		if (sk->sk_err) {
			len = sock_error(sk);
			break;
		}

		if (sk->sk_shutdown & RCV_SHUTDOWN) {
			len = 0;
			break;
		}

		if (sk->sk_state == DCCP_CLOSED) {
			if (!sock_flag(sk, SOCK_DONE)) {
				/* This occurs when user tries to read
				 * from never connected socket.
				 */
				len = -ENOTCONN;
				break;
			}
			len = 0;
			break;
		}

		if (!timeo) {
			len = -EAGAIN;
			break;
		}

		if (signal_pending(current)) {
			len = sock_intr_errno(timeo);
			break;
		}

		sk_wait_data(sk, &timeo);
		continue;
	found_ok_skb:
		if (len > skb->len)
			len = skb->len;
		else if (len < skb->len)
			msg->msg_flags |= MSG_TRUNC;

		if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) {
			/* Exception. Bailout! */
			len = -EFAULT;
			break;
		}
	found_fin_ok:
		if (!(flags & MSG_PEEK))
			sk_eat_skb(sk, skb, 0);
		break;
	} while (1);
out:
	release_sock(sk);
	return len;
}

Project: linux-2.6

static int __init dccp_mib_init(void)
{
	int rc = -ENOMEM;

	dccp_statistics[0] = alloc_percpu(struct dccp_mib);
	if (dccp_statistics[0] == NULL)
		goto out;

	dccp_statistics[1] = alloc_percpu(struct dccp_mib);
	if (dccp_statistics[1] == NULL)
		goto out_free_one;

	rc = 0;
out:
	return rc;
out_free_one:
	free_percpu(dccp_statistics[0]);
	dccp_statistics[0] = NULL;
	goto out;

}

Project: linux-2.6

static inline int dccp_listen_start(struct sock *sk, int backlog)
{
	struct dccp_sock *dp = dccp_sk(sk);

	dp->dccps_role = DCCP_ROLE_LISTEN;
	return inet_csk_listen_start(sk, backlog);
}

Project: linux-2.6

static int __init dccp_init(void)
{
	unsigned long goal;
	int ehash_order, bhash_order, i;
	int rc = -ENOBUFS;

	dccp_hashinfo.bind_bucket_cachep =
		kmem_cache_create("dccp_bind_bucket",
				  sizeof(struct inet_bind_bucket), 0,
				  SLAB_HWCACHE_ALIGN, NULL, NULL);
	if (!dccp_hashinfo.bind_bucket_cachep)
		goto out;

	/*
	 * Size and allocate the main established and bind bucket
	 * hash tables.
	 *
	 * The methodology is similar to that of the buffer cache.
	 */
	if (num_physpages >= (128 * 1024))
		goal = num_physpages >> (21 - PAGE_SHIFT);
	else
		goal = num_physpages >> (23 - PAGE_SHIFT);

	if (thash_entries)
		goal = (thash_entries *
			sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT;
	for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++)
		;
	do {
		dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE /
					sizeof(struct inet_ehash_bucket);
		while (dccp_hashinfo.ehash_size &
		       (dccp_hashinfo.ehash_size - 1))
			dccp_hashinfo.ehash_size--;
		dccp_hashinfo.ehash = (struct inet_ehash_bucket *)
			__get_free_pages(GFP_ATOMIC, ehash_order);
	} while (!dccp_hashinfo.ehash && --ehash_order > 0);

	if (!dccp_hashinfo.ehash) {
		DCCP_CRIT("Failed to allocate DCCP established hash table");
		goto out_free_bind_bucket_cachep;
	}

	for (i = 0; i < dccp_hashinfo.ehash_size; i++) {
		rwlock_init(&dccp_hashinfo.ehash[i].lock);
		INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain);
		INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].twchain);
	}

	bhash_order = ehash_order;

	do {
		dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE /
					sizeof(struct inet_bind_hashbucket);
		if ((dccp_hashinfo.bhash_size > (64 * 1024)) &&
		    bhash_order > 0)
			continue;
		dccp_hashinfo.bhash = (struct inet_bind_hashbucket *)
			__get_free_pages(GFP_ATOMIC, bhash_order);
	} while (!dccp_hashinfo.bhash && --bhash_order >= 0);

	if (!dccp_hashinfo.bhash) {
		DCCP_CRIT("Failed to allocate DCCP bind hash table");
		goto out_free_dccp_ehash;
	}

	for (i = 0; i < dccp_hashinfo.bhash_size; i++) {
		spin_lock_init(&dccp_hashinfo.bhash[i].lock);
		INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain);
	}

	rc = dccp_mib_init();
	if (rc)
		goto out_free_dccp_bhash;

	rc = dccp_ackvec_init();
	if (rc)
		goto out_free_dccp_mib;

	rc = dccp_sysctl_init();
	if (rc)
		goto out_ackvec_exit;
out:
	return rc;
out_ackvec_exit:
	dccp_ackvec_exit();
out_free_dccp_mib:
	dccp_mib_exit();
out_free_dccp_bhash:
	free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order);
	dccp_hashinfo.bhash = NULL;
out_free_dccp_ehash:
	free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order);
	dccp_hashinfo.ehash = NULL;
out_free_bind_bucket_cachep:
	kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep);
	dccp_hashinfo.bind_bucket_cachep = NULL;
	goto out;
}

Project: linux-2.6

static void __exit dccp_fini(void)
{
	dccp_mib_exit();
	free_pages((unsigned long)dccp_hashinfo.bhash,
		   get_order(dccp_hashinfo.bhash_size *
			     sizeof(struct inet_bind_hashbucket)));
	free_pages((unsigned long)dccp_hashinfo.ehash,
		   get_order(dccp_hashinfo.ehash_size *
			     sizeof(struct inet_ehash_bucket)));
	kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep);
	dccp_ackvec_exit();
	dccp_sysctl_exit();
}

Project: linux-2.6

int dccp_disconnect(struct sock *sk, int flags)
{
	struct inet_connection_sock *icsk = inet_csk(sk);
	struct inet_sock *inet = inet_sk(sk);
	int err = 0;
	const int old_state = sk->sk_state;

	if (old_state != DCCP_CLOSED)
		dccp_set_state(sk, DCCP_CLOSED);

	/* ABORT function of RFC793 */
	if (old_state == DCCP_LISTEN) {
		inet_csk_listen_stop(sk);
	/* FIXME: do the active reset thing */
	} else if (old_state == DCCP_REQUESTING)
		sk->sk_err = ECONNRESET;

	dccp_clear_xmit_timers(sk);
	__skb_queue_purge(&sk->sk_receive_queue);
	if (sk->sk_send_head != NULL) {
		__kfree_skb(sk->sk_send_head);
		sk->sk_send_head = NULL;
	}

	inet->dport = 0;

	if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
		inet_reset_saddr(sk);

	sk->sk_shutdown = 0;
	sock_reset_flag(sk, SOCK_DONE);

	icsk->icsk_backoff = 0;
	inet_csk_delack_init(sk);
	__sk_dst_reset(sk);

	BUG_TRAP(!inet->num || icsk->icsk_bind_hash);

	sk->sk_error_report(sk);
	return err;
}

Project: linux-2.6

int compat_dccp_setsockopt(struct sock *sk, int level, int optname,
			   char __user *optval, int optlen)
{
	if (level != SOL_DCCP)
		return inet_csk_compat_setsockopt(sk, level, optname,
						  optval, optlen);
	return do_dccp_setsockopt(sk, level, optname, optval, optlen);
}

Project: linux-2.6

void dccp_shutdown(struct sock *sk, int how)
{
	dccp_pr_debug("entry\n");
}

Project: linux-2.6

unsigned int dccp_poll(struct file *file, struct socket *sock,
		       poll_table *wait)
{
	unsigned int mask;
	struct sock *sk = sock->sk;

	poll_wait(file, sk->sk_sleep, wait);
	if (sk->sk_state == DCCP_LISTEN)
		return inet_csk_listen_poll(sk);

	/* Socket is not locked. We are protected from async events
	   by poll logic and correct handling of state changes
	   made by another threads is impossible in any case.
	 */

	mask = 0;
	if (sk->sk_err)
		mask = POLLERR;

	if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED)
		mask |= POLLHUP;
	if (sk->sk_shutdown & RCV_SHUTDOWN)
		mask |= POLLIN | POLLRDNORM | POLLRDHUP;

	/* Connected? */
	if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) {
		if (atomic_read(&sk->sk_rmem_alloc) > 0)
			mask |= POLLIN | POLLRDNORM;

		if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
			if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
				mask |= POLLOUT | POLLWRNORM;
			} else {  /* send SIGIO later */
				set_bit(SOCK_ASYNC_NOSPACE,
					&sk->sk_socket->flags);
				set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);

				/* Race breaker. If space is freed after
				 * wspace test but before the flags are set,
				 * IO signal will be lost.
				 */
				if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
					mask |= POLLOUT | POLLWRNORM;
			}
		}
	}
	return mask;
}

Project: linux-2.6

static int do_dccp_getsockopt(struct sock *sk, int level, int optname,
		    char __user *optval, int __user *optlen)
{
	struct dccp_sock *dp;
	int val, len;

	if (get_user(len, optlen))
		return -EFAULT;

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

	dp = dccp_sk(sk);

	switch (optname) {
	case DCCP_SOCKOPT_PACKET_SIZE:
		DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n");
		return 0;
	case DCCP_SOCKOPT_SERVICE:
		return dccp_getsockopt_service(sk, len,
					       (__be32 __user *)optval, optlen);
	case DCCP_SOCKOPT_SEND_CSCOV:
		val = dp->dccps_pcslen;
		len = sizeof(val);
		break;
	case DCCP_SOCKOPT_RECV_CSCOV:
		val = dp->dccps_pcrlen;
		len = sizeof(val);
		break;
	case 128 ... 191:
		return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname,
					     len, (u32 __user *)optval, optlen);
	case 192 ... 255:
		return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname,
					     len, (u32 __user *)optval, optlen);
	default:
		return -ENOPROTOOPT;
	}

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

	return 0;
}

Project: linux-2.6

static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
		char __user *optval, int optlen)
{
	struct dccp_sock *dp = dccp_sk(sk);
	int val, err = 0;

	if (optlen < sizeof(int))
		return -EINVAL;

	if (get_user(val, (int __user *)optval))
		return -EFAULT;

	if (optname == DCCP_SOCKOPT_SERVICE)
		return dccp_setsockopt_service(sk, val, optval, optlen);

	lock_sock(sk);
	switch (optname) {
	case DCCP_SOCKOPT_PACKET_SIZE:
		DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n");
		err = 0;
		break;
	case DCCP_SOCKOPT_CHANGE_L:
		if (optlen != sizeof(struct dccp_so_feat))
			err = -EINVAL;
		else
			err = dccp_setsockopt_change(sk, DCCPO_CHANGE_L,
						     (struct dccp_so_feat __user *)
						     optval);
		break;
	case DCCP_SOCKOPT_CHANGE_R:
		if (optlen != sizeof(struct dccp_so_feat))
			err = -EINVAL;
		else
			err = dccp_setsockopt_change(sk, DCCPO_CHANGE_R,
						     (struct dccp_so_feat __user *)
						     optval);
		break;
	case DCCP_SOCKOPT_SEND_CSCOV:	/* sender side, RFC 4340, sec. 9.2 */
		if (val < 0 || val > 15)
			err = -EINVAL;
		else
			dp->dccps_pcslen = val;
		break;
	case DCCP_SOCKOPT_RECV_CSCOV:	/* receiver side, RFC 4340 sec. 9.2.1 */
		if (val < 0 || val > 15)
			err = -EINVAL;
		else {
			dp->dccps_pcrlen = val;
			/* FIXME: add feature negotiation,
			 * ChangeL(MinimumChecksumCoverage, val) */
		}
		break;
	default:
		err = -ENOPROTOOPT;
		break;
	}

	release_sock(sk);
	return err;
}

Project: linux-2.6

static int dccp_setsockopt_service(struct sock *sk, const __be32 service,
				   char __user *optval, int optlen)
{
	struct dccp_sock *dp = dccp_sk(sk);
	struct dccp_service_list *sl = NULL;

	if (service == DCCP_SERVICE_INVALID_VALUE ||
	    optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32))
		return -EINVAL;

	if (optlen > sizeof(service)) {
		sl = kmalloc(optlen, GFP_KERNEL);
		if (sl == NULL)
			return -ENOMEM;

		sl->dccpsl_nr = optlen / sizeof(u32) - 1;
		if (copy_from_user(sl->dccpsl_list,
				   optval + sizeof(service),
				   optlen - sizeof(service)) ||
		    dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) {
			kfree(sl);
			return -EFAULT;
		}
	}

	lock_sock(sk);
	dp->dccps_service = service;

	kfree(dp->dccps_service_list);

	dp->dccps_service_list = sl;
	release_sock(sk);
	return 0;
}

Project: linux-2.6

void dccp_close(struct sock *sk, long timeout)
{
	struct dccp_sock *dp = dccp_sk(sk);
	struct sk_buff *skb;
	int state;

	lock_sock(sk);

	sk->sk_shutdown = SHUTDOWN_MASK;

	if (sk->sk_state == DCCP_LISTEN) {
		dccp_set_state(sk, DCCP_CLOSED);

		/* Special case. */
		inet_csk_listen_stop(sk);

		goto adjudge_to_death;
	}

	sk_stop_timer(sk, &dp->dccps_xmit_timer);

	/*
	 * We need to flush the recv. buffs.  We do this only on the
	 * descriptor close, not protocol-sourced closes, because the
	  *reader process may not have drained the data yet!
	 */
	/* FIXME: check for unread data */
	while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) {
		__kfree_skb(skb);
	}

	if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) {
		/* Check zero linger _after_ checking for unread data. */
		sk->sk_prot->disconnect(sk, 0);
	} else if (dccp_close_state(sk)) {
		dccp_send_close(sk, 1);
	}

	sk_stream_wait_close(sk, timeout);

adjudge_to_death:
	state = sk->sk_state;
	sock_hold(sk);
	sock_orphan(sk);
	atomic_inc(sk->sk_prot->orphan_count);

	/*
	 * It is the last release_sock in its life. It will remove backlog.
	 */
	release_sock(sk);
	/*
	 * Now socket is owned by kernel and we acquire BH lock
	 * to finish close. No need to check for user refs.
	 */
	local_bh_disable();
	bh_lock_sock(sk);
	BUG_TRAP(!sock_owned_by_user(sk));

	/* Have we already been destroyed by a softirq or backlog? */
	if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED)
		goto out;

	/*
	 * The last release_sock may have processed the CLOSE or RESET
	 * packet moving sock to CLOSED state, if not we have to fire
	 * the CLOSE/CLOSEREQ retransmission timer, see "8.3. Termination"
	 * in draft-ietf-dccp-spec-11. -acme
	 */
	if (sk->sk_state == DCCP_CLOSING) {
		/* FIXME: should start at 2 * RTT */
		/* Timer for repeating the CLOSE/CLOSEREQ until an answer. */
		inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
					  inet_csk(sk)->icsk_rto,
					  DCCP_RTO_MAX);
#if 0
		/* Yeah, we should use sk->sk_prot->orphan_count, etc */
		dccp_set_state(sk, DCCP_CLOSED);
#endif
	}

	if (sk->sk_state == DCCP_CLOSED)
		inet_csk_destroy_sock(sk);

	/* Otherwise, socket is reprieved until protocol close. */

out:
	bh_unlock_sock(sk);
	local_bh_enable();
	sock_put(sk);
}

Project: linux-2.6

void dccp_unhash(struct sock *sk)
{
	inet_unhash(&dccp_hashinfo, sk);
}