static int sctp_msghdr_parse(const struct msghdr *msg,
struct sctp_cmsgs *cmsgs);
+static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
+ struct msghdr *msg, size_t msg_len,
+ struct sctp_transport *transport,
+ struct sctp_sndrcvinfo *sinfo)
+{
+ struct sock *sk = asoc->base.sk;
+ struct net *net = sock_net(sk);
+ struct sctp_datamsg *datamsg;
+ bool wait_connect = false;
+ struct sctp_chunk *chunk;
+ long timeo;
+ int err;
+
+ if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
+ err = -EINVAL;
+ goto err;
+ }
+
+ if (unlikely(!asoc->stream.out[sinfo->sinfo_stream].ext)) {
+ err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
+ if (err)
+ goto err;
+ }
+
+ if (sctp_sk(sk)->disable_fragments && msg_len > asoc->frag_point) {
+ err = -EMSGSIZE;
+ goto err;
+ }
+
+ if (sctp_state(asoc, CLOSED)) {
+ err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
+ if (err)
+ goto err;
+
+ if (sctp_sk(sk)->strm_interleave) {
+ timeo = sock_sndtimeo(sk, 0);
+ err = sctp_wait_for_connect(asoc, &timeo);
+ if (err)
+ goto err;
+ } else {
+ wait_connect = true;
+ }
+
+ pr_debug("%s: we associated primitively\n", __func__);
+ }
+
+ if (asoc->pmtu_pending)
+ sctp_assoc_pending_pmtu(asoc);
+
+ if (sctp_wspace(asoc) < msg_len)
+ sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
+
+ if (!sctp_wspace(asoc)) {
+ timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
+ err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
+ if (err)
+ goto err;
+ }
+
+ datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
+ if (IS_ERR(datamsg)) {
+ err = PTR_ERR(datamsg);
+ goto err;
+ }
+
+ asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
+
+ list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
+ sctp_chunk_hold(chunk);
+ sctp_set_owner_w(chunk);
+ chunk->transport = transport;
+ }
+
+ err = sctp_primitive_SEND(net, asoc, datamsg);
+ if (err) {
+ sctp_datamsg_free(datamsg);
+ goto err;
+ }
+
+ pr_debug("%s: we sent primitively\n", __func__);
+
+ sctp_datamsg_put(datamsg);
+
+ if (unlikely(wait_connect)) {
+ timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
+ sctp_wait_for_connect(asoc, &timeo);
+ }
+
+ err = msg_len;
+
+err:
+ return err;
+}
+
static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
{
struct net *net = sock_net(sk);
sctp_assoc_t associd = 0;
struct sctp_cmsgs cmsgs = { NULL };
enum sctp_scope scope;
- bool fill_sinfo_ttl = false, wait_connect = false;
- struct sctp_datamsg *datamsg;
- int msg_flags = msg->msg_flags;
+ bool fill_sinfo_ttl = false;
__u16 sinfo_flags = 0;
- long timeo;
int err;
err = 0;
goto out_free;
}
- if (asoc->pmtu_pending)
- sctp_assoc_pending_pmtu(asoc);
-
- /* If fragmentation is disabled and the message length exceeds the
- * association fragmentation point, return EMSGSIZE. The I-D
- * does not specify what this error is, but this looks like
- * a great fit.
- */
- if (sctp_sk(sk)->disable_fragments && (msg_len > asoc->frag_point)) {
- err = -EMSGSIZE;
- goto out_free;
- }
-
- /* Check for invalid stream. */
- if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
- err = -EINVAL;
- goto out_free;
- }
-
- /* Allocate sctp_stream_out_ext if not already done */
- if (unlikely(!asoc->stream.out[sinfo->sinfo_stream].ext)) {
- err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
- if (err)
- goto out_free;
- }
-
- if (sctp_wspace(asoc) < msg_len)
- sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
-
- timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
- if (!sctp_wspace(asoc)) {
- /* sk can be changed by peel off when waiting for buf. */
- err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
- if (err) {
- if (err == -ESRCH) {
- /* asoc is already dead. */
- new_asoc = NULL;
- err = -EPIPE;
- }
- goto out_free;
- }
- }
-
/* If an address is passed with the sendto/sendmsg call, it is used
* to override the primary destination address in the TCP model, or
* when SCTP_ADDR_OVER flag is set in the UDP model.
} else
chunk_tp = NULL;
- /* Auto-connect, if we aren't connected already. */
- if (sctp_state(asoc, CLOSED)) {
- err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
- if (err < 0)
- goto out_free;
-
- /* If stream interleave is enabled, wait_connect has to be
- * done earlier than data enqueue, as it needs to make data
- * or idata according to asoc->intl_enable which is set
- * after connection is done.
- */
- if (sctp_sk(asoc->base.sk)->strm_interleave) {
- timeo = sock_sndtimeo(sk, 0);
- err = sctp_wait_for_connect(asoc, &timeo);
- if (err)
- goto out_unlock;
- } else {
- wait_connect = true;
- }
-
- pr_debug("%s: we associated primitively\n", __func__);
- }
-
- /* Break the message into multiple chunks of maximum size. */
- datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
- if (IS_ERR(datamsg)) {
- err = PTR_ERR(datamsg);
- goto out_free;
- }
- asoc->force_delay = !!(msg->msg_flags & MSG_MORE);
-
- /* Now send the (possibly) fragmented message. */
- list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
- sctp_chunk_hold(chunk);
-
- /* Do accounting for the write space. */
- sctp_set_owner_w(chunk);
-
- chunk->transport = chunk_tp;
- }
-
- /* Send it to the lower layers. Note: all chunks
- * must either fail or succeed. The lower layer
- * works that way today. Keep it that way or this
- * breaks.
- */
- err = sctp_primitive_SEND(net, asoc, datamsg);
- /* Did the lower layer accept the chunk? */
- if (err) {
- sctp_datamsg_free(datamsg);
- goto out_free;
- }
-
- pr_debug("%s: we sent primitively\n", __func__);
-
- sctp_datamsg_put(datamsg);
- err = msg_len;
-
- if (unlikely(wait_connect)) {
- timeo = sock_sndtimeo(sk, msg_flags & MSG_DONTWAIT);
- sctp_wait_for_connect(asoc, &timeo);
- }
-
- /* If we are already past ASSOCIATE, the lower
- * layers are responsible for association cleanup.
- */
- goto out_unlock;
+ /* Send msg to the asoc */
+ err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, chunk_tp, sinfo);
out_free:
- if (new_asoc)
+ if (err < 0 && err != -ESRCH && new_asoc)
sctp_association_free(asoc);
out_unlock:
release_sock(sk);
-
out_nounlock:
- return sctp_error(sk, msg_flags, err);
-
-#if 0
-do_sock_err:
- if (msg_len)
- err = msg_len;
- else
- err = sock_error(sk);
- goto out;
-
-do_interrupted:
- if (msg_len)
- err = msg_len;
- goto out;
-#endif /* 0 */
+ return sctp_error(sk, msg->msg_flags, err);
}
/* This is an extended version of skb_pull() that removes the data from the
OSDN Git Service
