helper: add SCTP handling functions

Add functions to set and verify SCTP packet checksum.

Signed-off-by: Dmitry Eremin-Solenikov <dmitry.ereminsolenikov@linaro.org>
Reviewed-by: Bill Fischofer <bill.fischofer@linaro.org>
Signed-off-by: Maxim Uvarov <maxim.uvarov@linaro.org>

1 files changed, 42 insertions, 0 deletions

diff --git a/helper/include/odp/helper/chksum.h b/helper/include/odp/helper/chksum.h
index c03abeb7b..148b98601 100644
--- a/helper/include/odp/helper/chksum.h
+++ b/helper/include/odp/helper/chksum.h
@@ -190,6 +190,48 @@ static inline int odph_udp_chksum_verify(odp_packet_t odp_pkt)
 }
 
 /**
+ * Generate SCTP checksum
+ *
+ * This function supports SCTP over either IPv4 or IPV6 - including handling
+ * any IPv4 header options and any IPv6 extension headers.  However it
+ * does not handle tunneled pkts (i.e. any case where there is more than
+ * one IPv4/IPv6 header).
+ * This function also handles non-contiguous pkts.  In particular it can
+ * handle arbitrary packet segmentation, including cases where the segments
+ * are not 2 byte aligned, nor have a length that is a multiple of 2.  This
+ * function also can handle jumbo frames (at least up to 10K).
+ *
+ * This function will insert the calculated CRC32-c checksum into the proper
+ * location in the SCTP header.
+ *
+ * @param  odp_pkt     Calculate and insert chksum for this SCTP pkt, which can
+ *                     be over IPv4 or IPv6.
+ * @retval 0 on success
+ * @retval <0 on failure
+ */
+int odph_sctp_chksum_set(odp_packet_t odp_pkt);
+
+/**
+ * Verify SCTP checksum
+ *
+ * This function supports SCTP over either IPv4 or IPV6 - including handling
+ * any IPv4 header options and any IPv6 extension headers.  However it
+ * does not handle tunneled pkts (i.e. any case where there is more than
+ * one IPv4/IPv6 header).
+ * This function also handles non-contiguous pkts.  In particular it can
+ * handle arbitrary packet segmentation, including cases where the segments
+ * are not 2 byte aligned, nor have a length that is a multiple of 2.  This
+ * function also can handle jumbo frames (at least up to 10K).
+ *
+ * @param  odp_pkt     Calculate and compare the chksum for this SCTP pkt,
+ *                     which can be over IPv4 or IPv6.
+ * @retval <0 on failure
+ * @retval 0 if the incoming chksum field is correct
+ * @retval 2 when the chksum field is incorrect
+ */
+int odph_sctp_chksum_verify(odp_packet_t odp_pkt);
+
+/**
  * @}
  */