text: #ifndef __NET_IPV6_WRAPPER_H
  #define __NET_IPV6_WRAPPER_H 1
  
  #include <linux/version.h>
  
  #include_next <net/ipv6.h>
  
  #if LINUX_VERSION_CODE < KERNEL_VERSION(3,3,0)
  #define ipv6_skip_exthdr rpl_ipv6_skip_exthdr
  extern int ipv6_skip_exthdr(const struct sk_buff *skb, int start,
  			    u8 *nexthdrp, __be16 *frag_offp);
  #endif
  
  enum {
  	OVS_IP6T_FH_F_FRAG	= (1 << 0),
  	OVS_IP6T_FH_F_AUTH	= (1 << 1),
  	OVS_IP6T_FH_F_SKIP_RH	= (1 << 2),
  };
  
  /* This function is upstream, but not the version which skips routing
   * headers with 0 segments_left. We plan to propose the extended version. */
  #define ipv6_find_hdr rpl_ipv6_find_hdr
  extern int ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
  			 int target, unsigned short *fragoff, int *fragflg);
  
  #endif
  