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sctp: implement assign_number for sctp_stream_interleave

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assign_number is added as a member of sctp_stream_interleave, used
to assign ssn for data or mid (message id) for idata, called in
sctp_packet_append_data. sctp_chunk_assign_ssn is left as it is,
and sctp_chunk_assign_mid is added for sctp_stream_interleave_1.

This procedure is described in section 2.2.2 of RFC8260.

All sizeof(struct sctp_data_chunk) in tx path is replaced with
sctp_datachk_len, to make it right for idata as well. And also
adjust sctp_chunk_is_data for SCTP_CID_I_DATA.

After this patch, idata can be built and sent in tx path.

Note that if sp strm_interleave is set, it has to wait_connect in
sctp_sendmsg, as asoc intl_enable need to be known after 4 shake-
hands, to decide if it should use data or idata later. data and
idata can't be mixed to send in one asoc.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long
2017-12-08 21:04:02 +08:00
committed by David S. Miller
parent 0c3f6f6554
commit 668c9beb90
9 changed files with 83 additions and 14 deletions
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17
net/sctp/socket.c
View File

@@ -2002,7 +2002,20 @@ static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
if (err < 0)
goto out_free;
wait_connect = true;
/* 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__);
}
@@ -3180,7 +3193,7 @@ static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned
if (val == 0) {
val = asoc->pathmtu - sp->pf->af->net_header_len;
val -= sizeof(struct sctphdr) +
sizeof(struct sctp_data_chunk);
sctp_datachk_len(&asoc->stream);
}
asoc->user_frag = val;
asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);