[SCTP]: Implement SCTP-AUTH internals

This patch implements the internals operations of the AUTH, such as
key computation and storage.  It also adds necessary variables to
the SCTP data structures.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 48 insertions, 1 deletions

diff --git a/include/net/sctp/constants.h b/include/net/sctp/constants.h
index bb37724495a5..777118f06dba 100644
--- a/include/net/sctp/constants.h
+++ b/include/net/sctp/constants.h
@@ -64,12 +64,18 @@ enum { SCTP_DEFAULT_INSTREAMS = SCTP_MAX_STREAM };
 #define SCTP_CID_MAX                    SCTP_CID_ASCONF_ACK
 
 #define SCTP_NUM_BASE_CHUNK_TYPES       (SCTP_CID_BASE_MAX + 1)
-#define SCTP_NUM_CHUNK_TYPES            (SCTP_NUM_BASE_CHUNKTYPES + 2)
 
 #define SCTP_NUM_ADDIP_CHUNK_TYPES      2
 
 #define SCTP_NUM_PRSCTP_CHUNK_TYPES     1
 
+#define SCTP_NUM_AUTH_CHUNK_TYPES       1
+
+#define SCTP_NUM_CHUNK_TYPES            (SCTP_NUM_BASE_CHUNK_TYPES + \
+                                         SCTP_NUM_ADDIP_CHUNK_TYPES +\
+                                         SCTP_NUM_PRSCTP_CHUNK_TYPES +\
+                                         SCTP_NUM_AUTH_CHUNK_TYPES)
+
 /* These are the different flavours of event.  */
 typedef enum {
 
@@ -409,4 +415,45 @@ typedef enum {
         SCTP_LOWER_CWND_INACTIVE,
 } sctp_lower_cwnd_t;
 
+
+/* SCTP-AUTH Necessary constants */
+
+/* SCTP-AUTH, Section 3.3
+ *
+ *  The following Table 2 shows the currently defined values for HMAC
+ *  identifiers.
+ *
+ *  +-----------------+--------------------------+
+ *  | HMAC Identifier | Message Digest Algorithm |
+ *  +-----------------+--------------------------+
+ *  | 0               | Reserved                 |
+ *  | 1               | SHA-1 defined in [8]     |
+ *  | 2               | Reserved                 |
+ *  | 3               | SHA-256 defined in [8]   |
+ *  +-----------------+--------------------------+
+ */
+enum {
+        SCTP_AUTH_HMAC_ID_RESERVED_0,
+        SCTP_AUTH_HMAC_ID_SHA1,
+        SCTP_AUTH_HMAC_ID_RESERVED_2,
+        SCTP_AUTH_HMAC_ID_SHA256
+};
+
+#define SCTP_AUTH_HMAC_ID_MAX   SCTP_AUTH_HMAC_ID_SHA256
+#define SCTP_AUTH_NUM_HMACS (SCTP_AUTH_HMAC_ID_SHA256 + 1)
+#define SCTP_SHA1_SIG_SIZE 20
+#define SCTP_SHA256_SIG_SIZE 32
+
+/*  SCTP-AUTH, Section 3.2
+ *     The chunk types for INIT, INIT-ACK, SHUTDOWN-COMPLETE and AUTH chunks
+ *     MUST NOT be listed in the CHUNKS parameter
+ */
+#define SCTP_NUM_NOAUTH_CHUNKS  4
+#define SCTP_AUTH_MAX_CHUNKS    (SCTP_NUM_CHUNK_TYPES - SCTP_NUM_NOAUTH_CHUNKS)
+
+/* SCTP-AUTH Section 6.1
+ * The RANDOM parameter MUST contain a 32 byte random number.
+ */
+#define SCTP_AUTH_RANDOM_LENGTH 32
+
 #endif /* __sctp_constants_h__ */