[PATCH net-next 23/27] sctp: add rfc6525 section 5.2.5

[Xin Long]

This patch is to add Receiver-Side Procedures for the Add Outgoing
Streams Request Parameter described in section 5.2.5.

Signed-off-by: Xin Long <lucien....@gmail.com>
---
 include/net/sctp/sm.h |  4 ++++
 net/sctp/stream.c     | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+)

diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index e1b2509..5624b52 100644
--- a/include/net/sctp/sm.h
+++ b/include/net/sctp/sm.h
@@ -293,6 +293,10 @@ struct sctp_chunk *sctp_process_strreset_tsnreq(
                                struct sctp_association *asoc,
                                union sctp_params param,
                                struct sctp_ulpevent **evp);
+struct sctp_chunk *sctp_process_strreset_addstrm_out(
+                               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 fce4317..b51a037 100644
--- a/net/sctp/stream.c
+++ b/net/sctp/stream.c
@@ -283,3 +283,59 @@ struct sctp_chunk *sctp_process_strreset_tsnreq(
        return sctp_make_strreset_tsnresp(asoc, result, request_seq,
                                          asoc->next_tsn, initial_tsn);
 }
+
+struct sctp_chunk *sctp_process_strreset_addstrm_out(
+                               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 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->streamincnt > SCTP_MAX_STREAM)
+               goto out;
+
+       nums = nums + asoc->streamincnt;
+       if (ksize(asoc->streamin) / sizeof(*asoc->streamin) < nums) {
+               struct sctp_stream_in *streamin;
+
+               streamin = kcalloc(nums, sizeof(*streamin), GFP_ATOMIC);
+               if (!streamin)
+                       goto out;
+
+               memcpy(streamin, asoc->streamin,
+                      sizeof(*streamin) * asoc->streamincnt);
+
+               kfree(asoc->streamin);
+               asoc->streamin = streamin;
+       }
+
+       asoc->streamincnt = nums;
+
+       result = SCTP_STRRESET_PERFORMED;
+
+       *evp = sctp_ulpevent_make_stream_change_event(asoc,
+               0, ntohs(addstrm->number_of_streams), 0, GFP_ATOMIC);
+
+out:
+       return sctp_make_strreset_resp(asoc, result, request_seq);
+}
-- 
2.1.0