sctp: update mid instead of ssn when doing stream and asoc reset

When using idata and doing stream and asoc reset, setting ssn with
0 could only clear the 1st 16 bits of mid.

So to make this work for both data and idata, it sets mid with 0
instead of ssn, and also mid_uo for unordered idata also need to
be cleared, as said in section 2.3.2 of RFC8260.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo R. Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 25 insertions, 15 deletions

diff --git a/net/sctp/stream.c b/net/sctp/stream.c
index b3a9f37c1598..06b644dd858c 100644
--- a/net/sctp/stream.c
+++ b/net/sctp/stream.c
@@ -216,11 +216,13 @@ void sctp_stream_clear(struct sctp_stream *stream)
 {
         int i;
 
-        for (i = 0; i < stream->outcnt; i++)
-                stream->out[i].ssn = 0;
+        for (i = 0; i < stream->outcnt; i++) {
+                stream->out[i].mid = 0;
+                stream->out[i].mid_uo = 0;
+        }
 
         for (i = 0; i < stream->incnt; i++)
-                stream->in[i].ssn = 0;
+                stream->in[i].mid = 0;
 }
 
 void sctp_stream_update(struct sctp_stream *stream, struct sctp_stream *new)
@@ -607,10 +609,10 @@ struct sctp_chunk *sctp_process_strreset_outreq(
                 }
 
                 for (i = 0; i < nums; i++)
-                        stream->in[ntohs(str_p[i])].ssn = 0;
+                        stream->in[ntohs(str_p[i])].mid = 0;
         } else {
                 for (i = 0; i < stream->incnt; i++)
-                        stream->in[i].ssn = 0;
+                        stream->in[i].mid = 0;
         }
 
         result = SCTP_STRRESET_PERFORMED;
@@ -783,10 +785,12 @@ struct sctp_chunk *sctp_process_strreset_tsnreq(
         /* G5:  The next expected and outgoing SSNs MUST be reset to 0 for all
          *      incoming and outgoing streams.
          */
-        for (i = 0; i < stream->outcnt; i++)
-                stream->out[i].ssn = 0;
+        for (i = 0; i < stream->outcnt; i++) {
+                stream->out[i].mid = 0;
+                stream->out[i].mid_uo = 0;
+        }
         for (i = 0; i < stream->incnt; i++)
-                stream->in[i].ssn = 0;
+                stream->in[i].mid = 0;
 
         result = SCTP_STRRESET_PERFORMED;
 
@@ -976,11 +980,15 @@ struct sctp_chunk *sctp_process_strreset_resp(
 
                 if (result == SCTP_STRRESET_PERFORMED) {
                         if (nums) {
-                                for (i = 0; i < nums; i++)
-                                        stream->out[ntohs(str_p[i])].ssn = 0;
+                                for (i = 0; i < nums; i++) {
+                                        stream->out[ntohs(str_p[i])].mid = 0;
+                                        stream->out[ntohs(str_p[i])].mid_uo = 0;
+                                }
                         } else {
-                                for (i = 0; i < stream->outcnt; i++)
-                                        stream->out[i].ssn = 0;
+                                for (i = 0; i < stream->outcnt; i++) {
+                                        stream->out[i].mid = 0;
+                                        stream->out[i].mid_uo = 0;
+                                }
                         }
 
                         flags = SCTP_STREAM_RESET_OUTGOING_SSN;
@@ -1041,10 +1049,12 @@ struct sctp_chunk *sctp_process_strreset_resp(
                         asoc->ctsn_ack_point = asoc->next_tsn - 1;
                         asoc->adv_peer_ack_point = asoc->ctsn_ack_point;
 
-                        for (i = 0; i < stream->outcnt; i++)
-                                stream->out[i].ssn = 0;
+                        for (i = 0; i < stream->outcnt; i++) {
+                                stream->out[i].mid = 0;
+                                stream->out[i].mid_uo = 0;
+                        }
                         for (i = 0; i < stream->incnt; i++)
-                                stream->in[i].ssn = 0;
+                                stream->in[i].mid = 0;
                 }
 
                 for (i = 0; i < stream->outcnt; i++)