SDP_HEAD_SIZE
#define SDP_MAX_PAYLOAD (SDP_MAX_PACKET - SDP_HEAD_SIZE)
ssk->recv_bytes - SDP_HEAD_SIZE, wait);
if (atomic && resid > ssk->xmit_size_goal - SDP_HEAD_SIZE) {
ssk->xmit_size_goal - SDP_HEAD_SIZE);
n->m_pkthdr.len + mb->m_pkthdr.len - SDP_HEAD_SIZE <
m_adj(mb, SDP_HEAD_SIZE);
M_PREPEND(m, SDP_HEAD_SIZE, M_WAITOK);
m_adj(mb, SDP_HEAD_SIZE);
mb->m_pkthdr.len == SDP_HEAD_SIZE)) {