Commit dd8378b3 authored by Xin Long's avatar Xin Long Committed by David S. Miller
Browse files

sctp: clean up __sctp_connect 



__sctp_connect is doing quit similar things as sctp_sendmsg_new_asoc.
To factor out common functions, this patch is to clean up their code
to make them look more similar:

  1. create the asoc and add a peer with the 1st addr.
  2. add peers with the other addrs into this asoc one by one.

while at it, also remove the unused 'addrcnt'.

Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f40f1177

net/sctp/socket.c

+73 −136
Original line number Diff line number Diff line
@@ -1049,152 +1049,104 @@ out: 
 * Common routine for handling connect() and sctp_connectx().

 * Connect will come in with just a single address.

 */

static int __sctp_connect(struct sock *sk,

			  struct sockaddr *kaddrs,

			  int addrs_size, int flags,

			  sctp_assoc_t *assoc_id)

static int __sctp_connect(struct sock *sk, struct sockaddr *kaddrs,

			  int addrs_size, int flags, sctp_assoc_t *assoc_id)

{

	struct net *net = sock_net(sk);

	struct sctp_sock *sp;

	struct sctp_endpoint *ep;

	struct sctp_association *asoc = NULL;

	struct sctp_association *asoc2;

	struct sctp_association *old, *asoc;

	struct sctp_sock *sp = sctp_sk(sk);

	struct sctp_endpoint *ep = sp->ep;

	struct sctp_transport *transport;

	union sctp_addr to;

	struct net *net = sock_net(sk);

	void *addr_buf = kaddrs;

	union sctp_addr *daddr;

	enum sctp_scope scope;

	struct sctp_af *af;

	int walk_size, err;

	long timeo;

	int err = 0;

	int addrcnt = 0;

	int walk_size = 0;

	union sctp_addr *sa_addr = NULL;

	void *addr_buf;

	unsigned short port;



	sp = sctp_sk(sk);

	ep = sp->ep;



	/* connect() cannot be done on a socket that is already in ESTABLISHED

	 * state - UDP-style peeled off socket or a TCP-style socket that

	 * is already connected.

	 * It cannot be done even on a TCP-style listening socket.

	 */

	if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||

	    (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {

		err = -EISCONN;

		goto out_free;

	}

	    (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)))

		return -EISCONN;



	/* Walk through the addrs buffer and count the number of addresses. */

	addr_buf = kaddrs;

	while (walk_size < addrs_size) {

		struct sctp_af *af;

	daddr = addr_buf;

	af = sctp_get_af_specific(daddr->sa.sa_family);

	if (!af || af->sockaddr_len > addrs_size)

		return -EINVAL;



		if (walk_size + sizeof(sa_family_t) > addrs_size) {

			err = -EINVAL;

			goto out_free;

		}

	err = sctp_verify_addr(sk, daddr, af->sockaddr_len);

	if (err)

		return err;



		sa_addr = addr_buf;

		af = sctp_get_af_specific(sa_addr->sa.sa_family);

	asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);

	if (asoc)

		return asoc->state >= SCTP_STATE_ESTABLISHED ? -EISCONN

							     : -EALREADY;



		/* If the address family is not supported or if this address

		 * causes the address buffer to overflow return EINVAL.

		 */

		if (!af || (walk_size + af->sockaddr_len) > addrs_size) {

			err = -EINVAL;

			goto out_free;

		}

	if (sctp_endpoint_is_peeled_off(ep, daddr))

		return -EADDRNOTAVAIL;



		port = ntohs(sa_addr->v4.sin_port);

	if (!ep->base.bind_addr.port) {

		if (sctp_autobind(sk))

			return -EAGAIN;

	} else {

		if (ep->base.bind_addr.port < inet_prot_sock(net) &&

		    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))

			return -EACCES;

	}



		/* Save current address so we can work with it */

		memcpy(&to, sa_addr, af->sockaddr_len);

	scope = sctp_scope(daddr);

	asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);

	if (!asoc)

		return -ENOMEM;



		err = sctp_verify_addr(sk, &to, af->sockaddr_len);

		if (err)

	err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);

	if (err < 0)

		goto out_free;



		/* Make sure the destination port is correctly set

		 * in all addresses.

		 */

		if (asoc && asoc->peer.port && asoc->peer.port != port) {

			err = -EINVAL;

	transport = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);

	if (!transport) {

		err = -ENOMEM;

		goto out_free;

	}



		/* Check if there already is a matching association on the

		 * endpoint (other than the one created here).

		 */

		asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);

		if (asoc2 && asoc2 != asoc) {

			if (asoc2->state >= SCTP_STATE_ESTABLISHED)

				err = -EISCONN;

			else

				err = -EALREADY;

	addr_buf += af->sockaddr_len;

	walk_size = af->sockaddr_len;

	while (walk_size < addrs_size) {

		err = -EINVAL;

		if (walk_size + sizeof(sa_family_t) > addrs_size)

			goto out_free;

		}



		/* If we could not find a matching association on the endpoint,

		 * make sure that there is no peeled-off association matching

		 * the peer address even on another socket.

		 */

		if (sctp_endpoint_is_peeled_off(ep, &to)) {

			err = -EADDRNOTAVAIL;

		daddr = addr_buf;

		af = sctp_get_af_specific(daddr->sa.sa_family);

		if (!af || af->sockaddr_len + walk_size > addrs_size)

			goto out_free;

		}



		if (!asoc) {

			/* If a bind() or sctp_bindx() is not called prior to

			 * an sctp_connectx() call, the system picks an

			 * ephemeral port and will choose an address set

			 * equivalent to binding with a wildcard address.

			 */

			if (!ep->base.bind_addr.port) {

				if (sctp_autobind(sk)) {

					err = -EAGAIN;

					goto out_free;

				}

			} else {

				/*

				 * If an unprivileged user inherits a 1-many

				 * style socket with open associations on a

				 * privileged port, it MAY be permitted to

				 * accept new associations, but it SHOULD NOT

				 * be permitted to open new associations.

				 */

				if (ep->base.bind_addr.port <

				    inet_prot_sock(net) &&

				    !ns_capable(net->user_ns,

				    CAP_NET_BIND_SERVICE)) {

					err = -EACCES;

		if (asoc->peer.port != ntohs(daddr->v4.sin_port))

			goto out_free;

				}

			}



			scope = sctp_scope(&to);

			asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);

			if (!asoc) {

				err = -ENOMEM;

		err = sctp_verify_addr(sk, daddr, af->sockaddr_len);

		if (err)

			goto out_free;

			}



			err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,

							      GFP_KERNEL);

			if (err < 0) {

		old = sctp_endpoint_lookup_assoc(ep, daddr, &transport);

		if (old && old != asoc) {

			err = old->state >= SCTP_STATE_ESTABLISHED ? -EISCONN

								   : -EALREADY;

			goto out_free;

		}



		if (sctp_endpoint_is_peeled_off(ep, daddr)) {

			err = -EADDRNOTAVAIL;

			goto out_free;

		}



		/* Prime the peer's transport structures.  */

		transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,

		transport = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL,

						SCTP_UNKNOWN);

		if (!transport) {

			err = -ENOMEM;

			goto out_free;

		}



		addrcnt++;

		addr_buf  += af->sockaddr_len;

		walk_size += af->sockaddr_len;

	}
@@ -1209,39 +1161,24 @@ static int __sctp_connect(struct sock *sk, 
	}



	err = sctp_primitive_ASSOCIATE(net, asoc, NULL);

	if (err < 0) {

	if (err < 0)

		goto out_free;

	}



	/* Initialize sk's dport and daddr for getpeername() */

	inet_sk(sk)->inet_dport = htons(asoc->peer.port);

	sp->pf->to_sk_daddr(sa_addr, sk);

	sp->pf->to_sk_daddr(daddr, sk);

	sk->sk_err = 0;



	timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);



	if (assoc_id)

		*assoc_id = asoc->assoc_id;



	err = sctp_wait_for_connect(asoc, &timeo);

	/* Note: the asoc may be freed after the return of

	 * sctp_wait_for_connect.

	 */



	/* Don't free association on exit. */

	asoc = NULL;

	timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);

	return sctp_wait_for_connect(asoc, &timeo);



out_free:

	pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",

		 __func__, asoc, kaddrs, err);



	if (asoc) {

		/* sctp_primitive_ASSOCIATE may have added this association

		 * To the hash table, try to unhash it, just in case, its a noop

		 * if it wasn't hashed so we're safe

		 */

	sctp_association_free(asoc);

	}

	return err;

}

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