+ /* SCTP-AUTH, Section 6.2
+ * The sender MUST calculate the MAC as described in RFC2104 [2]
+ * using the hash function H as described by the MAC Identifier and
+ * the shared association key K based on the endpoint pair shared key
+ * described by the shared key identifier. The 'data' used for the
+ * computation of the AUTH-chunk is given by the AUTH chunk with its
+ * HMAC field set to zero (as shown in Figure 6) followed by all
+ * chunks that are placed after the AUTH chunk in the SCTP packet.
+ */
+ if (auth)
+ sctp_auth_calculate_hmac(asoc, nskb,
+ (struct sctp_auth_chunk *)auth,
+ GFP_ATOMIC);
+
+ /* 2) Calculate the Adler-32 checksum of the whole packet,
+ * including the SCTP common header and all the
+ * chunks.
+ *
+ * Note: Adler-32 is no longer applicable, as has been replaced
+ * by CRC32-C as described in <draft-ietf-tsvwg-sctpcsum-02.txt>.
+ */
+ if (!(dst->dev->features & NETIF_F_NO_CSUM)) {
+ crc32 = sctp_start_cksum((__u8 *)sh, cksum_buf_len);