From: Dmitry Eremin-Solenikov <dmitry.ereminsoleni...@linaro.org> Add functions to set and verify SCTP packet checksum.
Signed-off-by: Dmitry Eremin-Solenikov <dmitry.ereminsoleni...@linaro.org> --- /** Email created from pull request 674 (lumag:sctp-checksum) ** https://github.com/Linaro/odp/pull/674 ** Patch: https://github.com/Linaro/odp/pull/674.patch ** Base sha: dc28824415ea510e3ef62e47f7640bf4a8420fde ** Merge commit sha: b482f9618a6edb2a2f2491ee5a7af757eab93b24 **/ helper/chksum.c | 75 ++++++++++++++++++++++++++++++ helper/include/odp/helper/chksum.h | 42 +++++++++++++++++ 2 files changed, 117 insertions(+) diff --git a/helper/chksum.c b/helper/chksum.c index da5625a78..ac273dd01 100644 --- a/helper/chksum.c +++ b/helper/chksum.c @@ -9,6 +9,7 @@ #include <odp.h> #include <odp/helper/ip.h> #include <odp/helper/udp.h> +#include <odp/helper/sctp.h> #include <odp/helper/tcp.h> #include <odp/helper/chksum.h> #include <stddef.h> @@ -351,3 +352,77 @@ int odph_udp_tcp_chksum(odp_packet_t odp_pkt, return ret_code; } + +static uint32_t odph_packet_crc32c(odp_packet_t pkt, + uint32_t offset, + uint32_t length, + uint32_t init_val) +{ + uint32_t sum = init_val; + + if (offset + length > odp_packet_len(pkt)) + return sum; + + while (length > 0) { + uint32_t seg_len; + void *data = odp_packet_offset(pkt, offset, &seg_len, NULL); + + if (seg_len > length) + seg_len = length; + + sum = odp_hash_crc32c(data, seg_len, sum); + length -= seg_len; + offset += seg_len; + } + + return sum; +} + +int odph_sctp_chksum_set(odp_packet_t pkt) +{ + uint32_t l4_offset = odp_packet_l4_offset(pkt); + uint32_t sum = 0; + + if (!odp_packet_has_sctp(pkt)) + return -1; + + if (l4_offset == ODP_PACKET_OFFSET_INVALID) + return -1; + + odp_packet_copy_from_mem(pkt, + l4_offset + ODPH_SCTPHDR_LEN - 4, + 4, + &sum); + + sum = ~odph_packet_crc32c(pkt, l4_offset, + odp_packet_len(pkt) - l4_offset, + ~0); + return odp_packet_copy_from_mem(pkt, + l4_offset + ODPH_SCTPHDR_LEN - 4, + 4, + &sum); +} + +int odph_sctp_chksum_verify(odp_packet_t pkt) +{ + uint32_t l4_offset = odp_packet_l4_offset(pkt); + uint32_t sum; + uint32_t temp = 0; + + if (!odp_packet_has_sctp(pkt)) + return -1; + + sum = odph_packet_crc32c(pkt, l4_offset, + ODPH_SCTPHDR_LEN - 4, + ~0); + sum = odp_hash_crc32c(&temp, 4, sum); + sum = odph_packet_crc32c(pkt, l4_offset + ODPH_SCTPHDR_LEN, + odp_packet_len(pkt) - l4_offset - + ODPH_SCTPHDR_LEN, + sum); + + odp_packet_copy_to_mem(pkt, l4_offset + ODPH_SCTPHDR_LEN - 4, + 4, &temp); + + return temp == sum; +} diff --git a/helper/include/odp/helper/chksum.h b/helper/include/odp/helper/chksum.h index c03abeb7b..28695ea88 100644 --- a/helper/include/odp/helper/chksum.h +++ b/helper/include/odp/helper/chksum.h @@ -189,6 +189,48 @@ static inline int odph_udp_chksum_verify(odp_packet_t odp_pkt) return odph_udp_tcp_chksum(odp_pkt, ODPH_CHKSUM_VERIFY, NULL); } +/** + * 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. + * @return 0 upon success and < 0 upon 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. + * @return Returns < 0 upon an error. Returns 1 upon no error and + * the incoming chksum field is 0 (disabled), else returns 0 + * if the incoming chksum field is correct, else returns 2 + * when the chksum field is incorrect. + */ +int odph_sctp_chksum_verify(odp_packet_t odp_pkt); + /** * @} */
