netdev - [PATCH net-next 24/27] sctp: add rfc6525 section 5.2.6

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Date:   Sun,  1 Jan 2017 19:20:41 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org
Cc:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>, davem@...emloft.net
Subject: [PATCH net-next 24/27] sctp: add rfc6525 section 5.2.6

This patch is to implement Receiver-Side Procedures for the Add Incoming
Streams Request Parameter described in section 5.2.6.

Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 include/net/sctp/sm.h |  4 ++++
 net/sctp/stream.c     | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+)

diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index 5624b52..b8ca767 100644
--- a/include/net/sctp/sm.h
+++ b/include/net/sctp/sm.h
@@ -297,6 +297,10 @@ struct sctp_chunk *sctp_process_strreset_addstrm_out(
 				struct sctp_association *asoc,
 				union sctp_params param,
 				struct sctp_ulpevent **evp);
+struct sctp_chunk *sctp_process_strreset_addstrm_in(
+				struct sctp_association *asoc,
+				union sctp_params param,
+				struct sctp_ulpevent **evp);
 
 /* Prototypes for statetable processing. */
 
diff --git a/net/sctp/stream.c b/net/sctp/stream.c
index b51a037..a2b248b 100644
--- a/net/sctp/stream.c
+++ b/net/sctp/stream.c
@@ -339,3 +339,62 @@ struct sctp_chunk *sctp_process_strreset_addstrm_out(
 out:
 	return sctp_make_strreset_resp(asoc, result, request_seq);
 }
+
+struct sctp_chunk *sctp_process_strreset_addstrm_in(
+				struct sctp_association *asoc,
+				union sctp_params param,
+				struct sctp_ulpevent **evp)
+{
+	struct sctp_strreset_addstrm *addstrm = param.v;
+	__u32 result = SCTP_STRRESET_DENIED;
+	__u32 request_seq;
+	__u16 i, nums;
+
+	request_seq = ntohl(addstrm->request_seq);
+	if (request_seq > asoc->strreset_inseq) {
+		result = SCTP_STRRESET_ERR_BAD_SEQNO;
+		goto out;
+	} else if (request_seq == asoc->strreset_inseq) {
+		asoc->strreset_inseq++;
+	}
+
+	if (!(asoc->strreset_enable & SCTP_ENABLE_CHANGE_ASSOC_REQ))
+		goto out;
+
+	if (asoc->strreset_outstanding) {
+		result = SCTP_STRRESET_ERR_IN_PROGRESS;
+		goto out;
+	}
+
+	nums = ntohs(addstrm->number_of_streams);
+	if (!nums || nums + asoc->streamoutcnt > SCTP_MAX_STREAM)
+		goto out;
+
+	nums = nums + asoc->streamoutcnt;
+	if (ksize(asoc->streamout) / sizeof(*asoc->streamout) < nums) {
+		struct sctp_stream_out *streamout;
+
+		streamout = kcalloc(nums, sizeof(*streamout), GFP_ATOMIC);
+		if (!streamout)
+			goto out;
+
+		memcpy(streamout, asoc->streamout,
+		       sizeof(*streamout) * asoc->streamoutcnt);
+
+		kfree(asoc->streamout);
+		asoc->streamout = streamout;
+	}
+
+	for (i = asoc->streamoutcnt; i < nums; i++)
+		asoc->streamout[i].state = SCTP_STREAM_OPEN;
+
+	asoc->streamoutcnt = nums;
+
+	result = SCTP_STRRESET_PERFORMED;
+
+	*evp = sctp_ulpevent_make_stream_change_event(asoc,
+		0, 0, ntohs(addstrm->number_of_streams), GFP_ATOMIC);
+
+out:
+	return sctp_make_strreset_resp(asoc, result, request_seq);
+}
-- 
2.1.0