gcmp_get_header_len
M_PREPEND(m, gcmp_get_header_len(k), IEEE80211_M_NOWAIT);
ovbcopy(ivp + gcmp_get_header_len(k), ivp, hdrlen);
gcmp_get_header_len(k), hdrlen);
m_adj(m, gcmp_get_header_len(k));
data_len = m->m_pkthdr.len - (hdrlen + gcmp_get_header_len(key));
m_copydata(m0, hdrlen + gcmp_get_header_len(key), data_len,
m_copyback(m0, hdrlen + gcmp_get_header_len(key), data_len,
(hdrlen + gcmp_get_header_len(key) + GCMP_MIC_LEN);
m_copydata(m, hdrlen + gcmp_get_header_len(key), data_len,
m_copydata(m, hdrlen + gcmp_get_header_len(key) + data_len,
m_copyback(m, hdrlen + gcmp_get_header_len(key), data_len,