[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>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 31841c3a7fe..47e54f8e2b6 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -724,6 +724,13 @@ struct sctp_chunk {
          */
         struct sctp_transport *transport;
 
+        /* SCTP-AUTH:  For the special case inbound processing of COOKIE-ECHO
+         * we need save a pointer to the AUTH chunk, since the SCTP-AUTH
+         * spec violates the principle premis that all chunks are processed
+         * in order.
+         */
+        struct sk_buff *auth_chunk;
+
         __u8 rtt_in_progress;   /* Is this chunk used for RTT calculation? */
         __u8 resent;            /* Has this chunk ever been retransmitted. */
         __u8 has_tsn;           /* Does this chunk have a TSN yet? */
@@ -1067,6 +1074,7 @@ void sctp_inq_init(struct sctp_inq *);
 void sctp_inq_free(struct sctp_inq *);
 void sctp_inq_push(struct sctp_inq *, struct sctp_chunk *packet);
 struct sctp_chunk *sctp_inq_pop(struct sctp_inq *);
+struct sctp_chunkhdr *sctp_inq_peek(struct sctp_inq *);
 void sctp_inq_set_th_handler(struct sctp_inq *, work_func_t);
 
 /* This is the structure we use to hold outbound chunks.  You push