verify_header
if (count < OS_AREA_SEGMENT_SIZE || verify_header(header) ||
result = verify_header(header);
header_check = vp->verify_header(
header_check = vp->verify_header(
int (*verify_header)(uint8_t *header,
vp->verify_header = &gre_verify_header;
vp->verify_header = &l2tpv3_verify_header;
vp->verify_header = &raw_verify_header;
vp->verify_header = &raw_verify_header;
vp->verify_header = &raw_verify_header;
vp->verify_header = NULL;
error = verify_header(&e, e.pos == e.start, ns);