inet6_del_offload
int inet6_del_offload(const struct net_offload *prot, unsigned char num);
inet6_del_offload(&esp6_offload, IPPROTO_ESP);
inet6_del_offload(&dstopt_offload, IPPROTO_DSTOPTS);
inet6_del_offload(&rthdr_offload, IPPROTO_ROUTING);
EXPORT_SYMBOL(inet6_del_offload);
return inet6_del_offload(&net_hotdata.udpv6_offload, IPPROTO_UDP);