+ ep->digest = kzalloc(SCTP_SIGNATURE_SIZE, gfp);
+ if (!ep->digest)
+ return NULL;
+
+ if (sctp_auth_enable) {
+ /* Allocate space for HMACS and CHUNKS authentication
+ * variables. There are arrays that we encode directly
+ * into parameters to make the rest of the operations easier.
+ */
+ auth_hmacs = kzalloc(sizeof(sctp_hmac_algo_param_t) +
+ sizeof(__u16) * SCTP_AUTH_NUM_HMACS, gfp);
+ if (!auth_hmacs)
+ goto nomem;
+
+ auth_chunks = kzalloc(sizeof(sctp_chunks_param_t) +
+ SCTP_NUM_CHUNK_TYPES, gfp);
+ if (!auth_chunks)
+ goto nomem;
+
+ /* Initialize the HMACS parameter.
+ * SCTP-AUTH: Section 3.3
+ * Every endpoint supporting SCTP chunk authentication MUST
+ * support the HMAC based on the SHA-1 algorithm.
+ */
+ auth_hmacs->param_hdr.type = SCTP_PARAM_HMAC_ALGO;
+ auth_hmacs->param_hdr.length =
+ htons(sizeof(sctp_paramhdr_t) + 2);
+ auth_hmacs->hmac_ids[0] = htons(SCTP_AUTH_HMAC_ID_SHA1);
+
+ /* Initialize the CHUNKS parameter */
+ auth_chunks->param_hdr.type = SCTP_PARAM_CHUNKS;
+
+ /* If the Add-IP functionality is enabled, we must
+ * authenticate, ASCONF and ASCONF-ACK chunks
+ */
+ if (sctp_addip_enable) {
+ auth_chunks->chunks[0] = SCTP_CID_ASCONF;
+ auth_chunks->chunks[1] = SCTP_CID_ASCONF_ACK;
+ auth_chunks->param_hdr.length =
+ htons(sizeof(sctp_paramhdr_t) + 2);
+ }
+ }
+