[SCTP]: Implement the receive and verification of AUTH chunk
This patch implements the receive path needed to process authenticated
chunks. Add ability to process the AUTH chunk and handle edge cases
for authenticated COOKIE-ECHO as well.
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index 3bdd8dc..03158e3 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -1011,6 +1011,16 @@
state = asoc->state;
subtype = SCTP_ST_CHUNK(chunk->chunk_hdr->type);
+ /* SCTP-AUTH, Section 6.3:
+ * The receiver has a list of chunk types which it expects
+ * to be received only after an AUTH-chunk. This list has
+ * been sent to the peer during the association setup. It
+ * MUST silently discard these chunks if they are not placed
+ * after an AUTH chunk in the packet.
+ */
+ if (sctp_auth_recv_cid(subtype.chunk, asoc) && !chunk->auth)
+ continue;
+
/* Remember where the last DATA chunk came from so we
* know where to send the SACK.
*/