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

   1 #ifndef __SCTP_CHECKSUM_WRAPPER_H
   2 #define __SCTP_CHECKSUM_WRAPPER_H 1
   3
   4 #include <linux/version.h>
   5 #include_next <net/sctp/checksum.h>
   6
   7 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,12,0)
   8 static inline __le32 sctp_compute_cksum(const struct sk_buff *skb,
   9                                         unsigned int offset)
  10 {
  11         const struct sk_buff *iter;
  12
  13         __u32 crc32 = sctp_start_cksum(skb->data + offset,
  14                                        skb_headlen(skb) - offset);
  15         skb_walk_frags(skb, iter)
  16                 crc32 = sctp_update_cksum((__u8 *) iter->data,
  17                                           skb_headlen(iter), crc32);
  18
  19         /* Open-code sctp_end_cksum() to avoid a sparse warning due to a bug in
  20          * sparse annotations in Linux fixed in 3.10 in commit eee1d5a14 (sctp:
  21          * Correct type and usage of sctp_end_cksum()). */
  22         return cpu_to_le32(~crc32);
  23 }
  24 #endif
  25
  26 #endif