sctp: factor out sctp_sendmsg_new_asoc from sctp_sendmsg
This patch is to move the codes for creating a new asoc if no asoc was found into sctp_sendmsg_new_asoc. Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long
David S. Miller
parent
f84af33138
commit
2bfd80f9ed
@ -1606,6 +1606,87 @@ static int sctp_error(struct sock *sk, int flags, int err)
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static int sctp_msghdr_parse(const struct msghdr *msg,
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struct sctp_cmsgs *cmsgs);
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static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
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struct sctp_cmsgs *cmsgs,
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union sctp_addr *daddr,
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struct sctp_transport **tp)
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{
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struct sctp_endpoint *ep = sctp_sk(sk)->ep;
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struct net *net = sock_net(sk);
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struct sctp_association *asoc;
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enum sctp_scope scope;
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int err = -EINVAL;
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*tp = NULL;
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if (sflags & (SCTP_EOF | SCTP_ABORT))
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return -EINVAL;
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if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
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sctp_sstate(sk, CLOSING)))
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return -EADDRNOTAVAIL;
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if (sctp_endpoint_is_peeled_off(ep, daddr))
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return -EADDRNOTAVAIL;
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if (!ep->base.bind_addr.port) {
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if (sctp_autobind(sk))
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return -EAGAIN;
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} else {
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if (ep->base.bind_addr.port < inet_prot_sock(net) &&
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!ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
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return -EACCES;
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}
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scope = sctp_scope(daddr);
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asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
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if (!asoc)
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return -ENOMEM;
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if (sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL) < 0) {
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err = -ENOMEM;
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goto free;
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}
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if (cmsgs->init) {
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struct sctp_initmsg *init = cmsgs->init;
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if (init->sinit_num_ostreams) {
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__u16 outcnt = init->sinit_num_ostreams;
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asoc->c.sinit_num_ostreams = outcnt;
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/* outcnt has been changed, need to re-init stream */
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err = sctp_stream_init(&asoc->stream, outcnt, 0,
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GFP_KERNEL);
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if (err)
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goto free;
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}
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if (init->sinit_max_instreams)
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asoc->c.sinit_max_instreams = init->sinit_max_instreams;
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if (init->sinit_max_attempts)
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asoc->max_init_attempts = init->sinit_max_attempts;
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if (init->sinit_max_init_timeo)
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asoc->max_init_timeo =
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msecs_to_jiffies(init->sinit_max_init_timeo);
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}
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*tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
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if (!*tp) {
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err = -ENOMEM;
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goto free;
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}
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return 0;
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free:
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sctp_association_free(asoc);
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return err;
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}
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static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
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struct msghdr *msg, size_t msg_len,
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struct sctp_transport *transport,
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@ -1715,7 +1796,6 @@ static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
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struct sctp_initmsg *sinit;
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sctp_assoc_t associd = 0;
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struct sctp_cmsgs cmsgs = { NULL };
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enum sctp_scope scope;
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bool fill_sinfo_ttl = false;
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__u16 sinfo_flags = 0;
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int err;
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@ -1817,20 +1897,6 @@ static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
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if (msg_name) {
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/* Look for a matching association on the endpoint. */
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asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
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/* If we could not find a matching association on the
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* endpoint, make sure that it is not a TCP-style
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* socket that already has an association or there is
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* no peeled-off association on another socket.
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*/
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if (!asoc &&
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((sctp_style(sk, TCP) &&
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(sctp_sstate(sk, ESTABLISHED) ||
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sctp_sstate(sk, CLOSING))) ||
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sctp_endpoint_is_peeled_off(ep, &to))) {
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err = -EADDRNOTAVAIL;
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goto out_unlock;
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}
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} else {
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asoc = sctp_id2assoc(sk, associd);
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if (!asoc) {
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@ -1879,108 +1945,13 @@ static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
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/* Do we need to create the association? */
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if (!asoc) {
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pr_debug("%s: there is no association yet\n", __func__);
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if (sinfo_flags & (SCTP_EOF | SCTP_ABORT)) {
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err = -EINVAL;
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err = sctp_sendmsg_new_asoc(sk, sinfo_flags, &cmsgs, &to,
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&transport);
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if (err)
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goto out_unlock;
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}
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/* Check for invalid stream against the stream counts,
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* either the default or the user specified stream counts.
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*/
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if (sinfo) {
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if (!sinit || !sinit->sinit_num_ostreams) {
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/* Check against the defaults. */
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if (sinfo->sinfo_stream >=
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sp->initmsg.sinit_num_ostreams) {
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err = -EINVAL;
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goto out_unlock;
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}
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} else {
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/* Check against the requested. */
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if (sinfo->sinfo_stream >=
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sinit->sinit_num_ostreams) {
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err = -EINVAL;
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goto out_unlock;
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}
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}
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}
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/*
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* API 3.1.2 bind() - UDP Style Syntax
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* If a bind() or sctp_bindx() is not called prior to a
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* sendmsg() call that initiates a new association, the
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* system picks an ephemeral port and will choose an address
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* set equivalent to binding with a wildcard address.
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*/
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if (!ep->base.bind_addr.port) {
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if (sctp_autobind(sk)) {
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err = -EAGAIN;
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goto out_unlock;
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}
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} else {
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/*
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* If an unprivileged user inherits a one-to-many
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* style socket with open associations on a privileged
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* port, it MAY be permitted to accept new associations,
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* but it SHOULD NOT be permitted to open new
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* associations.
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*/
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if (ep->base.bind_addr.port < inet_prot_sock(net) &&
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!ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
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err = -EACCES;
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goto out_unlock;
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}
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}
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scope = sctp_scope(&to);
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new_asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
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if (!new_asoc) {
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err = -ENOMEM;
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goto out_unlock;
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}
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asoc = new_asoc;
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err = sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL);
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if (err < 0) {
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err = -ENOMEM;
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goto out_free;
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}
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/* If the SCTP_INIT ancillary data is specified, set all
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* the association init values accordingly.
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*/
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if (sinit) {
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if (sinit->sinit_num_ostreams) {
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__u16 outcnt = sinit->sinit_num_ostreams;
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asoc->c.sinit_num_ostreams = outcnt;
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/* outcnt has been changed, so re-init stream */
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err = sctp_stream_init(&asoc->stream, outcnt, 0,
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GFP_KERNEL);
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if (err)
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goto out_free;
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}
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if (sinit->sinit_max_instreams) {
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asoc->c.sinit_max_instreams =
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sinit->sinit_max_instreams;
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}
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if (sinit->sinit_max_attempts) {
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asoc->max_init_attempts
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= sinit->sinit_max_attempts;
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}
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if (sinit->sinit_max_init_timeo) {
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asoc->max_init_timeo =
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msecs_to_jiffies(sinit->sinit_max_init_timeo);
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}
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}
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/* Prime the peer's transport structures. */
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transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
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if (!transport) {
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err = -ENOMEM;
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goto out_free;
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}
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asoc = transport->asoc;
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new_asoc = asoc;
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}
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/* ASSERT: we have a valid association at this point. */
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