datapath/linux/compat/include/net/sctp/checksum.h

   1 #ifndef __SCTP_CHECKSUM_WRAPPER_H
   2 #define __SCTP_CHECKSUM_WRAPPER_H 1
   3
   4 #include_next <net/sctp/checksum.h>
   5
   6 #ifndef HAVE_SCTP_COMPUTE_CKSUM
   7 static inline __le32 sctp_compute_cksum(const struct sk_buff *skb,
   8                                         unsigned int offset)
   9 {
  10         const struct sk_buff *iter;
  11
  12         __u32 crc32 = sctp_start_cksum(skb->data + offset,
  13                                        skb_headlen(skb) - offset);
  14         skb_walk_frags(skb, iter)
  15                 crc32 = sctp_update_cksum((__u8 *) iter->data,
  16                                           skb_headlen(iter), crc32);
  17
  18         /* Open-code sctp_end_cksum() to avoid a sparse warning due to a bug in
  19          * sparse annotations in Linux fixed in 3.10 in commit eee1d5a14 (sctp:
  20          * Correct type and usage of sctp_end_cksum()). */
  21         return cpu_to_le32(~crc32);
  22 }
  23 #endif
  24
  25 #endif